---------------------------
-What: IPv4 only connection tracking/NAT/helpers
-When: 2.6.22
-Why: The new layer 3 independant connection tracking replaces the old
- IPv4 only version. After some stabilization of the new code the
- old one will be removed.
-Who: Patrick McHardy <kaber@trash.net>
-
----------------------------
-
What: ACPI hooks (X86_SPEEDSTEP_CENTRINO_ACPI) in speedstep-centrino driver
When: December 2006
Why: Speedstep-centrino driver with ACPI hooks and acpi-cpufreq driver are
-header-y += ip_conntrack_helper.h
-header-y += ip_conntrack_protocol.h
-header-y += ip_conntrack_sctp.h
-header-y += ip_conntrack_tcp.h
-header-y += ip_conntrack_tftp.h
-header-y += ip_nat_pptp.h
header-y += ipt_addrtype.h
header-y += ipt_ah.h
header-y += ipt_CLASSIFY.h
header-y += ipt_TTL.h
header-y += ipt_ULOG.h
-unifdef-y += ip_conntrack.h
-unifdef-y += ip_conntrack_h323.h
-unifdef-y += ip_conntrack_irc.h
-unifdef-y += ip_conntrack_pptp.h
-unifdef-y += ip_conntrack_proto_gre.h
-unifdef-y += ip_conntrack_tuple.h
-unifdef-y += ip_nat.h
-unifdef-y += ip_nat_rule.h
unifdef-y += ip_queue.h
unifdef-y += ip_tables.h
+++ /dev/null
-#ifndef _IP_CONNTRACK_H
-#define _IP_CONNTRACK_H
-
-#include <linux/netfilter/nf_conntrack_common.h>
-
-#ifdef __KERNEL__
-#include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
-#include <linux/bitops.h>
-#include <linux/compiler.h>
-#include <asm/atomic.h>
-
-#include <linux/timer.h>
-#include <linux/netfilter_ipv4/ip_conntrack_tcp.h>
-#include <linux/netfilter_ipv4/ip_conntrack_icmp.h>
-#include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h>
-#include <linux/netfilter_ipv4/ip_conntrack_sctp.h>
-
-/* per conntrack: protocol private data */
-union ip_conntrack_proto {
- /* insert conntrack proto private data here */
- struct ip_ct_gre gre;
- struct ip_ct_sctp sctp;
- struct ip_ct_tcp tcp;
- struct ip_ct_icmp icmp;
-};
-
-union ip_conntrack_expect_proto {
- /* insert expect proto private data here */
-};
-
-/* Add protocol helper include file here */
-#include <linux/netfilter_ipv4/ip_conntrack_h323.h>
-#include <linux/netfilter_ipv4/ip_conntrack_pptp.h>
-#include <linux/netfilter_ipv4/ip_conntrack_amanda.h>
-#include <linux/netfilter_ipv4/ip_conntrack_ftp.h>
-#include <linux/netfilter_ipv4/ip_conntrack_irc.h>
-
-/* per conntrack: application helper private data */
-union ip_conntrack_help {
- /* insert conntrack helper private data (master) here */
- struct ip_ct_h323_master ct_h323_info;
- struct ip_ct_pptp_master ct_pptp_info;
- struct ip_ct_ftp_master ct_ftp_info;
- struct ip_ct_irc_master ct_irc_info;
-};
-
-#ifdef CONFIG_IP_NF_NAT_NEEDED
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_pptp.h>
-
-/* per conntrack: nat application helper private data */
-union ip_conntrack_nat_help {
- /* insert nat helper private data here */
- struct ip_nat_pptp nat_pptp_info;
-};
-#endif
-
-#include <linux/types.h>
-#include <linux/skbuff.h>
-
-#ifdef CONFIG_NETFILTER_DEBUG
-#define IP_NF_ASSERT(x) \
-do { \
- if (!(x)) \
- /* Wooah! I'm tripping my conntrack in a frenzy of \
- netplay... */ \
- printk("NF_IP_ASSERT: %s:%i(%s)\n", \
- __FILE__, __LINE__, __FUNCTION__); \
-} while(0)
-#else
-#define IP_NF_ASSERT(x)
-#endif
-
-struct ip_conntrack_helper;
-
-struct ip_conntrack
-{
- /* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
- plus 1 for any connection(s) we are `master' for */
- struct nf_conntrack ct_general;
-
- /* Have we seen traffic both ways yet? (bitset) */
- unsigned long status;
-
- /* Timer function; drops refcnt when it goes off. */
- struct timer_list timeout;
-
-#ifdef CONFIG_IP_NF_CT_ACCT
- /* Accounting Information (same cache line as other written members) */
- struct ip_conntrack_counter counters[IP_CT_DIR_MAX];
-#endif
- /* If we were expected by an expectation, this will be it */
- struct ip_conntrack *master;
-
- /* Current number of expected connections */
- unsigned int expecting;
-
- /* Unique ID that identifies this conntrack*/
- unsigned int id;
-
- /* Helper, if any. */
- struct ip_conntrack_helper *helper;
-
- /* Storage reserved for other modules: */
- union ip_conntrack_proto proto;
-
- union ip_conntrack_help help;
-
-#ifdef CONFIG_IP_NF_NAT_NEEDED
- struct {
- struct ip_nat_info info;
- union ip_conntrack_nat_help help;
-#if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \
- defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE)
- int masq_index;
-#endif
- } nat;
-#endif /* CONFIG_IP_NF_NAT_NEEDED */
-
-#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
- u_int32_t mark;
-#endif
-
-#ifdef CONFIG_IP_NF_CONNTRACK_SECMARK
- u_int32_t secmark;
-#endif
-
- /* Traversed often, so hopefully in different cacheline to top */
- /* These are my tuples; original and reply */
- struct ip_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
-};
-
-struct ip_conntrack_expect
-{
- /* Internal linked list (global expectation list) */
- struct list_head list;
-
- /* We expect this tuple, with the following mask */
- struct ip_conntrack_tuple tuple, mask;
-
- /* Function to call after setup and insertion */
- void (*expectfn)(struct ip_conntrack *new,
- struct ip_conntrack_expect *this);
-
- /* The conntrack of the master connection */
- struct ip_conntrack *master;
-
- /* Timer function; deletes the expectation. */
- struct timer_list timeout;
-
- /* Usage count. */
- atomic_t use;
-
- /* Unique ID */
- unsigned int id;
-
- /* Flags */
- unsigned int flags;
-
-#ifdef CONFIG_IP_NF_NAT_NEEDED
- __be32 saved_ip;
- /* This is the original per-proto part, used to map the
- * expected connection the way the recipient expects. */
- union ip_conntrack_manip_proto saved_proto;
- /* Direction relative to the master connection. */
- enum ip_conntrack_dir dir;
-#endif
-};
-
-#define IP_CT_EXPECT_PERMANENT 0x1
-
-static inline struct ip_conntrack *
-tuplehash_to_ctrack(const struct ip_conntrack_tuple_hash *hash)
-{
- return container_of(hash, struct ip_conntrack,
- tuplehash[hash->tuple.dst.dir]);
-}
-
-/* get master conntrack via master expectation */
-#define master_ct(conntr) (conntr->master)
-
-/* Alter reply tuple (maybe alter helper). */
-extern void
-ip_conntrack_alter_reply(struct ip_conntrack *conntrack,
- const struct ip_conntrack_tuple *newreply);
-
-/* Is this tuple taken? (ignoring any belonging to the given
- conntrack). */
-extern int
-ip_conntrack_tuple_taken(const struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack *ignored_conntrack);
-
-/* Return conntrack_info and tuple hash for given skb. */
-static inline struct ip_conntrack *
-ip_conntrack_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
-{
- *ctinfo = skb->nfctinfo;
- return (struct ip_conntrack *)skb->nfct;
-}
-
-/* decrement reference count on a conntrack */
-static inline void
-ip_conntrack_put(struct ip_conntrack *ct)
-{
- IP_NF_ASSERT(ct);
- nf_conntrack_put(&ct->ct_general);
-}
-
-extern int invert_tuplepr(struct ip_conntrack_tuple *inverse,
- const struct ip_conntrack_tuple *orig);
-
-extern void __ip_ct_refresh_acct(struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- const struct sk_buff *skb,
- unsigned long extra_jiffies,
- int do_acct);
-
-/* Refresh conntrack for this many jiffies and do accounting */
-static inline void ip_ct_refresh_acct(struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- const struct sk_buff *skb,
- unsigned long extra_jiffies)
-{
- __ip_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
-}
-
-/* Refresh conntrack for this many jiffies */
-static inline void ip_ct_refresh(struct ip_conntrack *ct,
- const struct sk_buff *skb,
- unsigned long extra_jiffies)
-{
- __ip_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
-}
-
-/* These are for NAT. Icky. */
-/* Update TCP window tracking data when NAT mangles the packet */
-extern void ip_conntrack_tcp_update(struct sk_buff *skb,
- struct ip_conntrack *conntrack,
- enum ip_conntrack_dir dir);
-
-/* Call me when a conntrack is destroyed. */
-extern void (*ip_conntrack_destroyed)(struct ip_conntrack *conntrack);
-
-/* Fake conntrack entry for untracked connections */
-extern struct ip_conntrack ip_conntrack_untracked;
-
-/* Returns new sk_buff, or NULL */
-struct sk_buff *
-ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user);
-
-/* Iterate over all conntracks: if iter returns true, it's deleted. */
-extern void
-ip_ct_iterate_cleanup(int (*iter)(struct ip_conntrack *i, void *data),
- void *data);
-
-extern struct ip_conntrack_helper *
-__ip_conntrack_helper_find_byname(const char *);
-extern struct ip_conntrack_helper *
-ip_conntrack_helper_find_get(const struct ip_conntrack_tuple *tuple);
-extern void ip_conntrack_helper_put(struct ip_conntrack_helper *helper);
-
-extern struct ip_conntrack_protocol *
-__ip_conntrack_proto_find(u_int8_t protocol);
-extern struct ip_conntrack_protocol *
-ip_conntrack_proto_find_get(u_int8_t protocol);
-extern void ip_conntrack_proto_put(struct ip_conntrack_protocol *proto);
-
-extern void ip_ct_remove_expectations(struct ip_conntrack *ct);
-
-extern struct ip_conntrack *ip_conntrack_alloc(struct ip_conntrack_tuple *,
- struct ip_conntrack_tuple *);
-
-extern void ip_conntrack_free(struct ip_conntrack *ct);
-
-extern void ip_conntrack_hash_insert(struct ip_conntrack *ct);
-
-extern struct ip_conntrack_expect *
-__ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);
-
-extern struct ip_conntrack_expect *
-ip_conntrack_expect_find_get(const struct ip_conntrack_tuple *tuple);
-
-extern struct ip_conntrack_tuple_hash *
-__ip_conntrack_find(const struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack *ignored_conntrack);
-
-extern void ip_conntrack_flush(void);
-
-/* It's confirmed if it is, or has been in the hash table. */
-static inline int is_confirmed(struct ip_conntrack *ct)
-{
- return test_bit(IPS_CONFIRMED_BIT, &ct->status);
-}
-
-static inline int is_dying(struct ip_conntrack *ct)
-{
- return test_bit(IPS_DYING_BIT, &ct->status);
-}
-
-extern unsigned int ip_conntrack_htable_size;
-extern int ip_conntrack_checksum;
-
-#define CONNTRACK_STAT_INC(count) (__get_cpu_var(ip_conntrack_stat).count++)
-#define CONNTRACK_STAT_INC_ATOMIC(count) \
-do { \
- local_bh_disable(); \
- __get_cpu_var(ip_conntrack_stat).count++; \
- local_bh_enable(); \
-} while (0)
-
-#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
-#include <linux/notifier.h>
-#include <linux/interrupt.h>
-
-struct ip_conntrack_ecache {
- struct ip_conntrack *ct;
- unsigned int events;
-};
-DECLARE_PER_CPU(struct ip_conntrack_ecache, ip_conntrack_ecache);
-
-#define CONNTRACK_ECACHE(x) (__get_cpu_var(ip_conntrack_ecache).x)
-
-extern struct atomic_notifier_head ip_conntrack_chain;
-extern struct atomic_notifier_head ip_conntrack_expect_chain;
-
-static inline int ip_conntrack_register_notifier(struct notifier_block *nb)
-{
- return atomic_notifier_chain_register(&ip_conntrack_chain, nb);
-}
-
-static inline int ip_conntrack_unregister_notifier(struct notifier_block *nb)
-{
- return atomic_notifier_chain_unregister(&ip_conntrack_chain, nb);
-}
-
-static inline int
-ip_conntrack_expect_register_notifier(struct notifier_block *nb)
-{
- return atomic_notifier_chain_register(&ip_conntrack_expect_chain, nb);
-}
-
-static inline int
-ip_conntrack_expect_unregister_notifier(struct notifier_block *nb)
-{
- return atomic_notifier_chain_unregister(&ip_conntrack_expect_chain,
- nb);
-}
-
-extern void ip_ct_deliver_cached_events(const struct ip_conntrack *ct);
-extern void __ip_ct_event_cache_init(struct ip_conntrack *ct);
-
-static inline void
-ip_conntrack_event_cache(enum ip_conntrack_events event,
- const struct sk_buff *skb)
-{
- struct ip_conntrack *ct = (struct ip_conntrack *)skb->nfct;
- struct ip_conntrack_ecache *ecache;
-
- local_bh_disable();
- ecache = &__get_cpu_var(ip_conntrack_ecache);
- if (ct != ecache->ct)
- __ip_ct_event_cache_init(ct);
- ecache->events |= event;
- local_bh_enable();
-}
-
-static inline void ip_conntrack_event(enum ip_conntrack_events event,
- struct ip_conntrack *ct)
-{
- if (is_confirmed(ct) && !is_dying(ct))
- atomic_notifier_call_chain(&ip_conntrack_chain, event, ct);
-}
-
-static inline void
-ip_conntrack_expect_event(enum ip_conntrack_expect_events event,
- struct ip_conntrack_expect *exp)
-{
- atomic_notifier_call_chain(&ip_conntrack_expect_chain, event, exp);
-}
-#else /* CONFIG_IP_NF_CONNTRACK_EVENTS */
-static inline void ip_conntrack_event_cache(enum ip_conntrack_events event,
- const struct sk_buff *skb) {}
-static inline void ip_conntrack_event(enum ip_conntrack_events event,
- struct ip_conntrack *ct) {}
-static inline void ip_ct_deliver_cached_events(const struct ip_conntrack *ct) {}
-static inline void
-ip_conntrack_expect_event(enum ip_conntrack_expect_events event,
- struct ip_conntrack_expect *exp) {}
-#endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
-
-#ifdef CONFIG_IP_NF_NAT_NEEDED
-static inline int ip_nat_initialized(struct ip_conntrack *conntrack,
- enum ip_nat_manip_type manip)
-{
- if (manip == IP_NAT_MANIP_SRC)
- return test_bit(IPS_SRC_NAT_DONE_BIT, &conntrack->status);
- return test_bit(IPS_DST_NAT_DONE_BIT, &conntrack->status);
-}
-#endif /* CONFIG_IP_NF_NAT_NEEDED */
-
-#endif /* __KERNEL__ */
-#endif /* _IP_CONNTRACK_H */
+++ /dev/null
-#ifndef _IP_CONNTRACK_AMANDA_H
-#define _IP_CONNTRACK_AMANDA_H
-/* AMANDA tracking. */
-
-struct ip_conntrack_expect;
-extern unsigned int (*ip_nat_amanda_hook)(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- unsigned int matchoff,
- unsigned int matchlen,
- struct ip_conntrack_expect *exp);
-#endif /* _IP_CONNTRACK_AMANDA_H */
+++ /dev/null
-#ifndef _IP_CONNTRACK_CORE_H
-#define _IP_CONNTRACK_CORE_H
-#include <linux/netfilter.h>
-
-#define MAX_IP_CT_PROTO 256
-extern struct ip_conntrack_protocol *ip_ct_protos[MAX_IP_CT_PROTO];
-
-/* This header is used to share core functionality between the
- standalone connection tracking module, and the compatibility layer's use
- of connection tracking. */
-extern unsigned int ip_conntrack_in(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *));
-
-extern int ip_conntrack_init(void);
-extern void ip_conntrack_cleanup(void);
-
-struct ip_conntrack_protocol;
-
-extern int
-ip_ct_get_tuple(const struct iphdr *iph,
- const struct sk_buff *skb,
- unsigned int dataoff,
- struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack_protocol *protocol);
-
-extern int
-ip_ct_invert_tuple(struct ip_conntrack_tuple *inverse,
- const struct ip_conntrack_tuple *orig,
- const struct ip_conntrack_protocol *protocol);
-
-/* Find a connection corresponding to a tuple. */
-struct ip_conntrack_tuple_hash *
-ip_conntrack_find_get(const struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack *ignored_conntrack);
-
-extern int __ip_conntrack_confirm(struct sk_buff **pskb);
-
-/* Confirm a connection: returns NF_DROP if packet must be dropped. */
-static inline int ip_conntrack_confirm(struct sk_buff **pskb)
-{
- struct ip_conntrack *ct = (struct ip_conntrack *)(*pskb)->nfct;
- int ret = NF_ACCEPT;
-
- if (ct) {
- if (!is_confirmed(ct) && !is_dying(ct))
- ret = __ip_conntrack_confirm(pskb);
- ip_ct_deliver_cached_events(ct);
- }
- return ret;
-}
-
-extern void ip_ct_unlink_expect(struct ip_conntrack_expect *exp);
-
-extern struct list_head *ip_conntrack_hash;
-extern struct list_head ip_conntrack_expect_list;
-extern rwlock_t ip_conntrack_lock;
-#endif /* _IP_CONNTRACK_CORE_H */
-
+++ /dev/null
-#ifndef _IP_CONNTRACK_FTP_H
-#define _IP_CONNTRACK_FTP_H
-/* FTP tracking. */
-
-/* This enum is exposed to userspace */
-enum ip_ct_ftp_type
-{
- /* PORT command from client */
- IP_CT_FTP_PORT,
- /* PASV response from server */
- IP_CT_FTP_PASV,
- /* EPRT command from client */
- IP_CT_FTP_EPRT,
- /* EPSV response from server */
- IP_CT_FTP_EPSV,
-};
-
-#ifdef __KERNEL__
-
-#define FTP_PORT 21
-
-#define NUM_SEQ_TO_REMEMBER 2
-/* This structure exists only once per master */
-struct ip_ct_ftp_master {
- /* Valid seq positions for cmd matching after newline */
- u_int32_t seq_aft_nl[IP_CT_DIR_MAX][NUM_SEQ_TO_REMEMBER];
- /* 0 means seq_match_aft_nl not set */
- int seq_aft_nl_num[IP_CT_DIR_MAX];
-};
-
-struct ip_conntrack_expect;
-
-/* For NAT to hook in when we find a packet which describes what other
- * connection we should expect. */
-extern unsigned int (*ip_nat_ftp_hook)(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- enum ip_ct_ftp_type type,
- unsigned int matchoff,
- unsigned int matchlen,
- struct ip_conntrack_expect *exp,
- u32 *seq);
-#endif /* __KERNEL__ */
-
-#endif /* _IP_CONNTRACK_FTP_H */
+++ /dev/null
-#ifndef _IP_CONNTRACK_H323_H
-#define _IP_CONNTRACK_H323_H
-
-#ifdef __KERNEL__
-
-#include <linux/netfilter/nf_conntrack_h323_asn1.h>
-
-#define RAS_PORT 1719
-#define Q931_PORT 1720
-#define H323_RTP_CHANNEL_MAX 4 /* Audio, video, FAX and other */
-
-/* This structure exists only once per master */
-struct ip_ct_h323_master {
-
- /* Original and NATed Q.931 or H.245 signal ports */
- u_int16_t sig_port[IP_CT_DIR_MAX];
-
- /* Original and NATed RTP ports */
- u_int16_t rtp_port[H323_RTP_CHANNEL_MAX][IP_CT_DIR_MAX];
-
- union {
- /* RAS connection timeout */
- u_int32_t timeout;
-
- /* Next TPKT length (for separate TPKT header and data) */
- u_int16_t tpkt_len[IP_CT_DIR_MAX];
- };
-};
-
-struct ip_conntrack_expect;
-
-extern int get_h225_addr(unsigned char *data, TransportAddress * addr,
- __be32 * ip, u_int16_t * port);
-extern void ip_conntrack_h245_expect(struct ip_conntrack *new,
- struct ip_conntrack_expect *this);
-extern void ip_conntrack_q931_expect(struct ip_conntrack *new,
- struct ip_conntrack_expect *this);
-extern int (*set_h245_addr_hook) (struct sk_buff ** pskb,
- unsigned char **data, int dataoff,
- H245_TransportAddress * addr,
- __be32 ip, u_int16_t port);
-extern int (*set_h225_addr_hook) (struct sk_buff ** pskb,
- unsigned char **data, int dataoff,
- TransportAddress * addr,
- __be32 ip, u_int16_t port);
-extern int (*set_sig_addr_hook) (struct sk_buff ** pskb,
- struct ip_conntrack * ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data,
- TransportAddress * addr, int count);
-extern int (*set_ras_addr_hook) (struct sk_buff ** pskb,
- struct ip_conntrack * ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data,
- TransportAddress * addr, int count);
-extern int (*nat_rtp_rtcp_hook) (struct sk_buff ** pskb,
- struct ip_conntrack * ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- H245_TransportAddress * addr,
- u_int16_t port, u_int16_t rtp_port,
- struct ip_conntrack_expect * rtp_exp,
- struct ip_conntrack_expect * rtcp_exp);
-extern int (*nat_t120_hook) (struct sk_buff ** pskb, struct ip_conntrack * ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- H245_TransportAddress * addr, u_int16_t port,
- struct ip_conntrack_expect * exp);
-extern int (*nat_h245_hook) (struct sk_buff ** pskb, struct ip_conntrack * ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- TransportAddress * addr, u_int16_t port,
- struct ip_conntrack_expect * exp);
-extern int (*nat_callforwarding_hook) (struct sk_buff ** pskb,
- struct ip_conntrack * ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- TransportAddress * addr,
- u_int16_t port,
- struct ip_conntrack_expect * exp);
-extern int (*nat_q931_hook) (struct sk_buff ** pskb, struct ip_conntrack * ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, TransportAddress * addr,
- int idx, u_int16_t port,
- struct ip_conntrack_expect * exp);
-
-#endif
-
-#endif
+++ /dev/null
-/* IP connection tracking helpers. */
-#ifndef _IP_CONNTRACK_HELPER_H
-#define _IP_CONNTRACK_HELPER_H
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-
-struct module;
-
-struct ip_conntrack_helper
-{
- struct list_head list; /* Internal use. */
-
- const char *name; /* name of the module */
- struct module *me; /* pointer to self */
- unsigned int max_expected; /* Maximum number of concurrent
- * expected connections */
- unsigned int timeout; /* timeout for expecteds */
-
- /* Mask of things we will help (compared against server response) */
- struct ip_conntrack_tuple tuple;
- struct ip_conntrack_tuple mask;
-
- /* Function to call when data passes; return verdict, or -1 to
- invalidate. */
- int (*help)(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info conntrackinfo);
-
- void (*destroy)(struct ip_conntrack *ct);
-
- int (*to_nfattr)(struct sk_buff *skb, const struct ip_conntrack *ct);
-};
-
-extern int ip_conntrack_helper_register(struct ip_conntrack_helper *);
-extern void ip_conntrack_helper_unregister(struct ip_conntrack_helper *);
-
-/* Allocate space for an expectation: this is mandatory before calling
- ip_conntrack_expect_related. You will have to call put afterwards. */
-extern struct ip_conntrack_expect *
-ip_conntrack_expect_alloc(struct ip_conntrack *master);
-extern void ip_conntrack_expect_put(struct ip_conntrack_expect *exp);
-
-/* Add an expected connection: can have more than one per connection */
-extern int ip_conntrack_expect_related(struct ip_conntrack_expect *exp);
-extern void ip_conntrack_unexpect_related(struct ip_conntrack_expect *exp);
-
-#endif /*_IP_CONNTRACK_HELPER_H*/
+++ /dev/null
-#ifndef _IP_CONNTRACK_ICMP_H
-#define _IP_CONNTRACK_ICMP_H
-
-#include <net/netfilter/ipv4/nf_conntrack_icmp.h>
-
-#endif /* _IP_CONNTRACK_ICMP_H */
+++ /dev/null
-/* IRC extension for IP connection tracking.
- * (C) 2000 by Harald Welte <laforge@gnumonks.org>
- * based on RR's ip_conntrack_ftp.h
- *
- * ip_conntrack_irc.h,v 1.6 2000/11/07 18:26:42 laforge Exp
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- *
- */
-#ifndef _IP_CONNTRACK_IRC_H
-#define _IP_CONNTRACK_IRC_H
-
-/* This structure exists only once per master */
-struct ip_ct_irc_master {
-};
-
-#ifdef __KERNEL__
-extern unsigned int (*ip_nat_irc_hook)(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- unsigned int matchoff,
- unsigned int matchlen,
- struct ip_conntrack_expect *exp);
-
-#define IRC_PORT 6667
-
-#endif /* __KERNEL__ */
-
-#endif /* _IP_CONNTRACK_IRC_H */
+++ /dev/null
-/* PPTP constants and structs */
-#ifndef _CONNTRACK_PPTP_H
-#define _CONNTRACK_PPTP_H
-
-/* state of the control session */
-enum pptp_ctrlsess_state {
- PPTP_SESSION_NONE, /* no session present */
- PPTP_SESSION_ERROR, /* some session error */
- PPTP_SESSION_STOPREQ, /* stop_sess request seen */
- PPTP_SESSION_REQUESTED, /* start_sess request seen */
- PPTP_SESSION_CONFIRMED, /* session established */
-};
-
-/* state of the call inside the control session */
-enum pptp_ctrlcall_state {
- PPTP_CALL_NONE,
- PPTP_CALL_ERROR,
- PPTP_CALL_OUT_REQ,
- PPTP_CALL_OUT_CONF,
- PPTP_CALL_IN_REQ,
- PPTP_CALL_IN_REP,
- PPTP_CALL_IN_CONF,
- PPTP_CALL_CLEAR_REQ,
-};
-
-
-/* conntrack private data */
-struct ip_ct_pptp_master {
- enum pptp_ctrlsess_state sstate; /* session state */
-
- /* everything below is going to be per-expectation in newnat,
- * since there could be more than one call within one session */
- enum pptp_ctrlcall_state cstate; /* call state */
- __be16 pac_call_id; /* call id of PAC, host byte order */
- __be16 pns_call_id; /* call id of PNS, host byte order */
-
- /* in pre-2.6.11 this used to be per-expect. Now it is per-conntrack
- * and therefore imposes a fixed limit on the number of maps */
- struct ip_ct_gre_keymap *keymap_orig, *keymap_reply;
-};
-
-/* conntrack_expect private member */
-struct ip_ct_pptp_expect {
- enum pptp_ctrlcall_state cstate; /* call state */
- __be16 pac_call_id; /* call id of PAC */
- __be16 pns_call_id; /* call id of PNS */
-};
-
-
-#ifdef __KERNEL__
-
-#define IP_CONNTR_PPTP PPTP_CONTROL_PORT
-
-#define PPTP_CONTROL_PORT 1723
-
-#define PPTP_PACKET_CONTROL 1
-#define PPTP_PACKET_MGMT 2
-
-#define PPTP_MAGIC_COOKIE 0x1a2b3c4d
-
-struct pptp_pkt_hdr {
- __u16 packetLength;
- __be16 packetType;
- __be32 magicCookie;
-};
-
-/* PptpControlMessageType values */
-#define PPTP_START_SESSION_REQUEST 1
-#define PPTP_START_SESSION_REPLY 2
-#define PPTP_STOP_SESSION_REQUEST 3
-#define PPTP_STOP_SESSION_REPLY 4
-#define PPTP_ECHO_REQUEST 5
-#define PPTP_ECHO_REPLY 6
-#define PPTP_OUT_CALL_REQUEST 7
-#define PPTP_OUT_CALL_REPLY 8
-#define PPTP_IN_CALL_REQUEST 9
-#define PPTP_IN_CALL_REPLY 10
-#define PPTP_IN_CALL_CONNECT 11
-#define PPTP_CALL_CLEAR_REQUEST 12
-#define PPTP_CALL_DISCONNECT_NOTIFY 13
-#define PPTP_WAN_ERROR_NOTIFY 14
-#define PPTP_SET_LINK_INFO 15
-
-#define PPTP_MSG_MAX 15
-
-/* PptpGeneralError values */
-#define PPTP_ERROR_CODE_NONE 0
-#define PPTP_NOT_CONNECTED 1
-#define PPTP_BAD_FORMAT 2
-#define PPTP_BAD_VALUE 3
-#define PPTP_NO_RESOURCE 4
-#define PPTP_BAD_CALLID 5
-#define PPTP_REMOVE_DEVICE_ERROR 6
-
-struct PptpControlHeader {
- __be16 messageType;
- __u16 reserved;
-};
-
-/* FramingCapability Bitmap Values */
-#define PPTP_FRAME_CAP_ASYNC 0x1
-#define PPTP_FRAME_CAP_SYNC 0x2
-
-/* BearerCapability Bitmap Values */
-#define PPTP_BEARER_CAP_ANALOG 0x1
-#define PPTP_BEARER_CAP_DIGITAL 0x2
-
-struct PptpStartSessionRequest {
- __be16 protocolVersion;
- __u16 reserved1;
- __be32 framingCapability;
- __be32 bearerCapability;
- __be16 maxChannels;
- __be16 firmwareRevision;
- __u8 hostName[64];
- __u8 vendorString[64];
-};
-
-/* PptpStartSessionResultCode Values */
-#define PPTP_START_OK 1
-#define PPTP_START_GENERAL_ERROR 2
-#define PPTP_START_ALREADY_CONNECTED 3
-#define PPTP_START_NOT_AUTHORIZED 4
-#define PPTP_START_UNKNOWN_PROTOCOL 5
-
-struct PptpStartSessionReply {
- __be16 protocolVersion;
- __u8 resultCode;
- __u8 generalErrorCode;
- __be32 framingCapability;
- __be32 bearerCapability;
- __be16 maxChannels;
- __be16 firmwareRevision;
- __u8 hostName[64];
- __u8 vendorString[64];
-};
-
-/* PptpStopReasons */
-#define PPTP_STOP_NONE 1
-#define PPTP_STOP_PROTOCOL 2
-#define PPTP_STOP_LOCAL_SHUTDOWN 3
-
-struct PptpStopSessionRequest {
- __u8 reason;
- __u8 reserved1;
- __u16 reserved2;
-};
-
-/* PptpStopSessionResultCode */
-#define PPTP_STOP_OK 1
-#define PPTP_STOP_GENERAL_ERROR 2
-
-struct PptpStopSessionReply {
- __u8 resultCode;
- __u8 generalErrorCode;
- __u16 reserved1;
-};
-
-struct PptpEchoRequest {
- __be32 identNumber;
-};
-
-/* PptpEchoReplyResultCode */
-#define PPTP_ECHO_OK 1
-#define PPTP_ECHO_GENERAL_ERROR 2
-
-struct PptpEchoReply {
- __be32 identNumber;
- __u8 resultCode;
- __u8 generalErrorCode;
- __u16 reserved;
-};
-
-/* PptpFramingType */
-#define PPTP_ASYNC_FRAMING 1
-#define PPTP_SYNC_FRAMING 2
-#define PPTP_DONT_CARE_FRAMING 3
-
-/* PptpCallBearerType */
-#define PPTP_ANALOG_TYPE 1
-#define PPTP_DIGITAL_TYPE 2
-#define PPTP_DONT_CARE_BEARER_TYPE 3
-
-struct PptpOutCallRequest {
- __be16 callID;
- __be16 callSerialNumber;
- __be32 minBPS;
- __be32 maxBPS;
- __be32 bearerType;
- __be32 framingType;
- __be16 packetWindow;
- __be16 packetProcDelay;
- __be16 phoneNumberLength;
- __u16 reserved1;
- __u8 phoneNumber[64];
- __u8 subAddress[64];
-};
-
-/* PptpCallResultCode */
-#define PPTP_OUTCALL_CONNECT 1
-#define PPTP_OUTCALL_GENERAL_ERROR 2
-#define PPTP_OUTCALL_NO_CARRIER 3
-#define PPTP_OUTCALL_BUSY 4
-#define PPTP_OUTCALL_NO_DIAL_TONE 5
-#define PPTP_OUTCALL_TIMEOUT 6
-#define PPTP_OUTCALL_DONT_ACCEPT 7
-
-struct PptpOutCallReply {
- __be16 callID;
- __be16 peersCallID;
- __u8 resultCode;
- __u8 generalErrorCode;
- __be16 causeCode;
- __be32 connectSpeed;
- __be16 packetWindow;
- __be16 packetProcDelay;
- __be32 physChannelID;
-};
-
-struct PptpInCallRequest {
- __be16 callID;
- __be16 callSerialNumber;
- __be32 callBearerType;
- __be32 physChannelID;
- __be16 dialedNumberLength;
- __be16 dialingNumberLength;
- __u8 dialedNumber[64];
- __u8 dialingNumber[64];
- __u8 subAddress[64];
-};
-
-/* PptpInCallResultCode */
-#define PPTP_INCALL_ACCEPT 1
-#define PPTP_INCALL_GENERAL_ERROR 2
-#define PPTP_INCALL_DONT_ACCEPT 3
-
-struct PptpInCallReply {
- __be16 callID;
- __be16 peersCallID;
- __u8 resultCode;
- __u8 generalErrorCode;
- __be16 packetWindow;
- __be16 packetProcDelay;
- __u16 reserved;
-};
-
-struct PptpInCallConnected {
- __be16 peersCallID;
- __u16 reserved;
- __be32 connectSpeed;
- __be16 packetWindow;
- __be16 packetProcDelay;
- __be32 callFramingType;
-};
-
-struct PptpClearCallRequest {
- __be16 callID;
- __u16 reserved;
-};
-
-struct PptpCallDisconnectNotify {
- __be16 callID;
- __u8 resultCode;
- __u8 generalErrorCode;
- __be16 causeCode;
- __u16 reserved;
- __u8 callStatistics[128];
-};
-
-struct PptpWanErrorNotify {
- __be16 peersCallID;
- __u16 reserved;
- __be32 crcErrors;
- __be32 framingErrors;
- __be32 hardwareOverRuns;
- __be32 bufferOverRuns;
- __be32 timeoutErrors;
- __be32 alignmentErrors;
-};
-
-struct PptpSetLinkInfo {
- __be16 peersCallID;
- __u16 reserved;
- __be32 sendAccm;
- __be32 recvAccm;
-};
-
-union pptp_ctrl_union {
- struct PptpStartSessionRequest sreq;
- struct PptpStartSessionReply srep;
- struct PptpStopSessionRequest streq;
- struct PptpStopSessionReply strep;
- struct PptpOutCallRequest ocreq;
- struct PptpOutCallReply ocack;
- struct PptpInCallRequest icreq;
- struct PptpInCallReply icack;
- struct PptpInCallConnected iccon;
- struct PptpClearCallRequest clrreq;
- struct PptpCallDisconnectNotify disc;
- struct PptpWanErrorNotify wanerr;
- struct PptpSetLinkInfo setlink;
-};
-
-extern int
-(*ip_nat_pptp_hook_outbound)(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- struct PptpControlHeader *ctlh,
- union pptp_ctrl_union *pptpReq);
-
-extern int
-(*ip_nat_pptp_hook_inbound)(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- struct PptpControlHeader *ctlh,
- union pptp_ctrl_union *pptpReq);
-
-extern void
-(*ip_nat_pptp_hook_exp_gre)(struct ip_conntrack_expect *exp_orig,
- struct ip_conntrack_expect *exp_reply);
-
-extern void
-(*ip_nat_pptp_hook_expectfn)(struct ip_conntrack *ct,
- struct ip_conntrack_expect *exp);
-#endif /* __KERNEL__ */
-#endif /* _CONNTRACK_PPTP_H */
+++ /dev/null
-#ifndef _CONNTRACK_PROTO_GRE_H
-#define _CONNTRACK_PROTO_GRE_H
-#include <asm/byteorder.h>
-
-/* GRE PROTOCOL HEADER */
-
-/* GRE Version field */
-#define GRE_VERSION_1701 0x0
-#define GRE_VERSION_PPTP 0x1
-
-/* GRE Protocol field */
-#define GRE_PROTOCOL_PPTP 0x880B
-
-/* GRE Flags */
-#define GRE_FLAG_C 0x80
-#define GRE_FLAG_R 0x40
-#define GRE_FLAG_K 0x20
-#define GRE_FLAG_S 0x10
-#define GRE_FLAG_A 0x80
-
-#define GRE_IS_C(f) ((f)&GRE_FLAG_C)
-#define GRE_IS_R(f) ((f)&GRE_FLAG_R)
-#define GRE_IS_K(f) ((f)&GRE_FLAG_K)
-#define GRE_IS_S(f) ((f)&GRE_FLAG_S)
-#define GRE_IS_A(f) ((f)&GRE_FLAG_A)
-
-/* GRE is a mess: Four different standards */
-struct gre_hdr {
-#if defined(__LITTLE_ENDIAN_BITFIELD)
- __u16 rec:3,
- srr:1,
- seq:1,
- key:1,
- routing:1,
- csum:1,
- version:3,
- reserved:4,
- ack:1;
-#elif defined(__BIG_ENDIAN_BITFIELD)
- __u16 csum:1,
- routing:1,
- key:1,
- seq:1,
- srr:1,
- rec:3,
- ack:1,
- reserved:4,
- version:3;
-#else
-#error "Adjust your <asm/byteorder.h> defines"
-#endif
- __be16 protocol;
-};
-
-/* modified GRE header for PPTP */
-struct gre_hdr_pptp {
- __u8 flags; /* bitfield */
- __u8 version; /* should be GRE_VERSION_PPTP */
- __be16 protocol; /* should be GRE_PROTOCOL_PPTP */
- __be16 payload_len; /* size of ppp payload, not inc. gre header */
- __be16 call_id; /* peer's call_id for this session */
- __be32 seq; /* sequence number. Present if S==1 */
- __be32 ack; /* seq number of highest packet recieved by */
- /* sender in this session */
-};
-
-
-/* this is part of ip_conntrack */
-struct ip_ct_gre {
- unsigned int stream_timeout;
- unsigned int timeout;
-};
-
-#ifdef __KERNEL__
-struct ip_conntrack_expect;
-struct ip_conntrack;
-
-/* structure for original <-> reply keymap */
-struct ip_ct_gre_keymap {
- struct list_head list;
-
- struct ip_conntrack_tuple tuple;
-};
-
-/* add new tuple->key_reply pair to keymap */
-int ip_ct_gre_keymap_add(struct ip_conntrack *ct,
- struct ip_conntrack_tuple *t,
- int reply);
-
-/* delete keymap entries */
-void ip_ct_gre_keymap_destroy(struct ip_conntrack *ct);
-
-
-/* get pointer to gre key, if present */
-static inline __be32 *gre_key(struct gre_hdr *greh)
-{
- if (!greh->key)
- return NULL;
- if (greh->csum || greh->routing)
- return (__be32 *) (greh+sizeof(*greh)+4);
- return (__be32 *) (greh+sizeof(*greh));
-}
-
-/* get pointer ot gre csum, if present */
-static inline __sum16 *gre_csum(struct gre_hdr *greh)
-{
- if (!greh->csum)
- return NULL;
- return (__sum16 *) (greh+sizeof(*greh));
-}
-
-#endif /* __KERNEL__ */
-
-#endif /* _CONNTRACK_PROTO_GRE_H */
+++ /dev/null
-/* Header for use in defining a given protocol for connection tracking. */
-#ifndef _IP_CONNTRACK_PROTOCOL_H
-#define _IP_CONNTRACK_PROTOCOL_H
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter/nfnetlink_conntrack.h>
-
-struct seq_file;
-
-struct ip_conntrack_protocol
-{
- /* Protocol number. */
- u_int8_t proto;
-
- /* Protocol name */
- const char *name;
-
- /* Try to fill in the third arg: dataoff is offset past IP
- hdr. Return true if possible. */
- int (*pkt_to_tuple)(const struct sk_buff *skb,
- unsigned int dataoff,
- struct ip_conntrack_tuple *tuple);
-
- /* Invert the per-proto part of the tuple: ie. turn xmit into reply.
- * Some packets can't be inverted: return 0 in that case.
- */
- int (*invert_tuple)(struct ip_conntrack_tuple *inverse,
- const struct ip_conntrack_tuple *orig);
-
- /* Print out the per-protocol part of the tuple. Return like seq_* */
- int (*print_tuple)(struct seq_file *,
- const struct ip_conntrack_tuple *);
-
- /* Print out the private part of the conntrack. */
- int (*print_conntrack)(struct seq_file *, const struct ip_conntrack *);
-
- /* Returns verdict for packet, or -1 for invalid. */
- int (*packet)(struct ip_conntrack *conntrack,
- const struct sk_buff *skb,
- enum ip_conntrack_info ctinfo);
-
- /* Called when a new connection for this protocol found;
- * returns TRUE if it's OK. If so, packet() called next. */
- int (*new)(struct ip_conntrack *conntrack, const struct sk_buff *skb);
-
- /* Called when a conntrack entry is destroyed */
- void (*destroy)(struct ip_conntrack *conntrack);
-
- int (*error)(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
- unsigned int hooknum);
-
- /* convert protoinfo to nfnetink attributes */
- int (*to_nfattr)(struct sk_buff *skb, struct nfattr *nfa,
- const struct ip_conntrack *ct);
-
- /* convert nfnetlink attributes to protoinfo */
- int (*from_nfattr)(struct nfattr *tb[], struct ip_conntrack *ct);
-
- int (*tuple_to_nfattr)(struct sk_buff *skb,
- const struct ip_conntrack_tuple *t);
- int (*nfattr_to_tuple)(struct nfattr *tb[],
- struct ip_conntrack_tuple *t);
-
- /* Module (if any) which this is connected to. */
- struct module *me;
-};
-
-/* Protocol registration. */
-extern int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto);
-extern void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto);
-/* Existing built-in protocols */
-extern struct ip_conntrack_protocol ip_conntrack_protocol_tcp;
-extern struct ip_conntrack_protocol ip_conntrack_protocol_udp;
-extern struct ip_conntrack_protocol ip_conntrack_protocol_icmp;
-extern struct ip_conntrack_protocol ip_conntrack_generic_protocol;
-extern int ip_conntrack_protocol_tcp_init(void);
-
-/* Log invalid packets */
-extern unsigned int ip_ct_log_invalid;
-
-extern int ip_ct_port_tuple_to_nfattr(struct sk_buff *,
- const struct ip_conntrack_tuple *);
-extern int ip_ct_port_nfattr_to_tuple(struct nfattr *tb[],
- struct ip_conntrack_tuple *);
-
-#ifdef CONFIG_SYSCTL
-#ifdef DEBUG_INVALID_PACKETS
-#define LOG_INVALID(proto) \
- (ip_ct_log_invalid == (proto) || ip_ct_log_invalid == IPPROTO_RAW)
-#else
-#define LOG_INVALID(proto) \
- ((ip_ct_log_invalid == (proto) || ip_ct_log_invalid == IPPROTO_RAW) \
- && net_ratelimit())
-#endif
-#else
-#define LOG_INVALID(proto) 0
-#endif /* CONFIG_SYSCTL */
-
-#endif /*_IP_CONNTRACK_PROTOCOL_H*/
+++ /dev/null
-#ifndef _IP_CONNTRACK_SCTP_H
-#define _IP_CONNTRACK_SCTP_H
-
-#include <linux/netfilter/nf_conntrack_sctp.h>
-
-#endif /* _IP_CONNTRACK_SCTP_H */
+++ /dev/null
-#ifndef __IP_CONNTRACK_SIP_H__
-#define __IP_CONNTRACK_SIP_H__
-#ifdef __KERNEL__
-
-#define SIP_PORT 5060
-#define SIP_TIMEOUT 3600
-
-enum sip_header_pos {
- POS_REG_REQ_URI,
- POS_REQ_URI,
- POS_FROM,
- POS_TO,
- POS_VIA,
- POS_CONTACT,
- POS_CONTENT,
- POS_MEDIA,
- POS_OWNER,
- POS_CONNECTION,
- POS_SDP_HEADER,
-};
-
-extern unsigned int (*ip_nat_sip_hook)(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- struct ip_conntrack *ct,
- const char **dptr);
-extern unsigned int (*ip_nat_sdp_hook)(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- struct ip_conntrack_expect *exp,
- const char *dptr);
-
-extern int ct_sip_get_info(const char *dptr, size_t dlen,
- unsigned int *matchoff,
- unsigned int *matchlen,
- enum sip_header_pos pos);
-extern int ct_sip_lnlen(const char *line, const char *limit);
-extern const char *ct_sip_search(const char *needle, const char *haystack,
- size_t needle_len, size_t haystack_len,
- int case_sensitive);
-#endif /* __KERNEL__ */
-#endif /* __IP_CONNTRACK_SIP_H__ */
+++ /dev/null
-#ifndef _IP_CONNTRACK_TCP_H
-#define _IP_CONNTRACK_TCP_H
-
-#include <linux/netfilter/nf_conntrack_tcp.h>
-
-#endif /* _IP_CONNTRACK_TCP_H */
+++ /dev/null
-#ifndef _IP_CT_TFTP
-#define _IP_CT_TFTP
-
-#define TFTP_PORT 69
-
-struct tftphdr {
- __be16 opcode;
-};
-
-#define TFTP_OPCODE_READ 1
-#define TFTP_OPCODE_WRITE 2
-#define TFTP_OPCODE_DATA 3
-#define TFTP_OPCODE_ACK 4
-#define TFTP_OPCODE_ERROR 5
-
-extern unsigned int (*ip_nat_tftp_hook)(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- struct ip_conntrack_expect *exp);
-
-#endif /* _IP_CT_TFTP */
+++ /dev/null
-#ifndef _IP_CONNTRACK_TUPLE_H
-#define _IP_CONNTRACK_TUPLE_H
-
-#include <linux/types.h>
-#include <linux/netfilter/nf_conntrack_tuple_common.h>
-
-/* A `tuple' is a structure containing the information to uniquely
- identify a connection. ie. if two packets have the same tuple, they
- are in the same connection; if not, they are not.
-
- We divide the structure along "manipulatable" and
- "non-manipulatable" lines, for the benefit of the NAT code.
-*/
-
-/* The protocol-specific manipulable parts of the tuple: always in
- network order! */
-union ip_conntrack_manip_proto
-{
- /* Add other protocols here. */
- u_int16_t all;
-
- struct {
- __be16 port;
- } tcp;
- struct {
- __be16 port;
- } udp;
- struct {
- __be16 id;
- } icmp;
- struct {
- __be16 port;
- } sctp;
- struct {
- __be16 key; /* key is 32bit, pptp only uses 16 */
- } gre;
-};
-
-/* The manipulable part of the tuple. */
-struct ip_conntrack_manip
-{
- __be32 ip;
- union ip_conntrack_manip_proto u;
-};
-
-/* This contains the information to distinguish a connection. */
-struct ip_conntrack_tuple
-{
- struct ip_conntrack_manip src;
-
- /* These are the parts of the tuple which are fixed. */
- struct {
- __be32 ip;
- union {
- /* Add other protocols here. */
- u_int16_t all;
-
- struct {
- __be16 port;
- } tcp;
- struct {
- __be16 port;
- } udp;
- struct {
- u_int8_t type, code;
- } icmp;
- struct {
- __be16 port;
- } sctp;
- struct {
- __be16 key; /* key is 32bit,
- * pptp only uses 16 */
- } gre;
- } u;
-
- /* The protocol. */
- u_int8_t protonum;
-
- /* The direction (for tuplehash) */
- u_int8_t dir;
- } dst;
-};
-
-/* This is optimized opposed to a memset of the whole structure. Everything we
- * really care about is the source/destination unions */
-#define IP_CT_TUPLE_U_BLANK(tuple) \
- do { \
- (tuple)->src.u.all = 0; \
- (tuple)->dst.u.all = 0; \
- } while (0)
-
-#ifdef __KERNEL__
-
-#define DUMP_TUPLE(tp) \
-DEBUGP("tuple %p: %u %u.%u.%u.%u:%hu -> %u.%u.%u.%u:%hu\n", \
- (tp), (tp)->dst.protonum, \
- NIPQUAD((tp)->src.ip), ntohs((tp)->src.u.all), \
- NIPQUAD((tp)->dst.ip), ntohs((tp)->dst.u.all))
-
-/* If we're the first tuple, it's the original dir. */
-#define DIRECTION(h) ((enum ip_conntrack_dir)(h)->tuple.dst.dir)
-
-/* Connections have two entries in the hash table: one for each way */
-struct ip_conntrack_tuple_hash
-{
- struct list_head list;
-
- struct ip_conntrack_tuple tuple;
-};
-
-#endif /* __KERNEL__ */
-
-static inline int ip_ct_tuple_src_equal(const struct ip_conntrack_tuple *t1,
- const struct ip_conntrack_tuple *t2)
-{
- return t1->src.ip == t2->src.ip
- && t1->src.u.all == t2->src.u.all;
-}
-
-static inline int ip_ct_tuple_dst_equal(const struct ip_conntrack_tuple *t1,
- const struct ip_conntrack_tuple *t2)
-{
- return t1->dst.ip == t2->dst.ip
- && t1->dst.u.all == t2->dst.u.all
- && t1->dst.protonum == t2->dst.protonum;
-}
-
-static inline int ip_ct_tuple_equal(const struct ip_conntrack_tuple *t1,
- const struct ip_conntrack_tuple *t2)
-{
- return ip_ct_tuple_src_equal(t1, t2) && ip_ct_tuple_dst_equal(t1, t2);
-}
-
-static inline int ip_ct_tuple_mask_cmp(const struct ip_conntrack_tuple *t,
- const struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack_tuple *mask)
-{
- return !(((t->src.ip ^ tuple->src.ip) & mask->src.ip)
- || ((t->dst.ip ^ tuple->dst.ip) & mask->dst.ip)
- || ((t->src.u.all ^ tuple->src.u.all) & mask->src.u.all)
- || ((t->dst.u.all ^ tuple->dst.u.all) & mask->dst.u.all)
- || ((t->dst.protonum ^ tuple->dst.protonum)
- & mask->dst.protonum));
-}
-
-#endif /* _IP_CONNTRACK_TUPLE_H */
+++ /dev/null
-#ifndef _IP_NAT_H
-#define _IP_NAT_H
-#include <linux/netfilter_ipv4.h>
-#include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
-
-#define IP_NAT_MAPPING_TYPE_MAX_NAMELEN 16
-
-enum ip_nat_manip_type
-{
- IP_NAT_MANIP_SRC,
- IP_NAT_MANIP_DST
-};
-
-/* SRC manip occurs POST_ROUTING or LOCAL_IN */
-#define HOOK2MANIP(hooknum) ((hooknum) != NF_IP_POST_ROUTING && (hooknum) != NF_IP_LOCAL_IN)
-
-#define IP_NAT_RANGE_MAP_IPS 1
-#define IP_NAT_RANGE_PROTO_SPECIFIED 2
-#define IP_NAT_RANGE_PROTO_RANDOM 4 /* add randomness to "port" selection */
-
-/* NAT sequence number modifications */
-struct ip_nat_seq {
- /* position of the last TCP sequence number
- * modification (if any) */
- u_int32_t correction_pos;
- /* sequence number offset before and after last modification */
- int16_t offset_before, offset_after;
-};
-
-/* Single range specification. */
-struct ip_nat_range
-{
- /* Set to OR of flags above. */
- unsigned int flags;
-
- /* Inclusive: network order. */
- __be32 min_ip, max_ip;
-
- /* Inclusive: network order */
- union ip_conntrack_manip_proto min, max;
-};
-
-/* For backwards compat: don't use in modern code. */
-struct ip_nat_multi_range_compat
-{
- unsigned int rangesize; /* Must be 1. */
-
- /* hangs off end. */
- struct ip_nat_range range[1];
-};
-
-#ifdef __KERNEL__
-#include <linux/list.h>
-
-/* Protects NAT hash tables, and NAT-private part of conntracks. */
-extern rwlock_t ip_nat_lock;
-
-/* The structure embedded in the conntrack structure. */
-struct ip_nat_info
-{
- struct list_head bysource;
- struct ip_nat_seq seq[IP_CT_DIR_MAX];
-};
-
-struct ip_conntrack;
-
-/* Set up the info structure to map into this range. */
-extern unsigned int ip_nat_setup_info(struct ip_conntrack *conntrack,
- const struct ip_nat_range *range,
- unsigned int hooknum);
-
-/* Is this tuple already taken? (not by us)*/
-extern int ip_nat_used_tuple(const struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack *ignored_conntrack);
-
-#else /* !__KERNEL__: iptables wants this to compile. */
-#define ip_nat_multi_range ip_nat_multi_range_compat
-#endif /*__KERNEL__*/
-#endif
+++ /dev/null
-#ifndef _IP_NAT_CORE_H
-#define _IP_NAT_CORE_H
-#include <linux/list.h>
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-
-/* This header used to share core functionality between the standalone
- NAT module, and the compatibility layer's use of NAT for masquerading. */
-
-extern unsigned int ip_nat_packet(struct ip_conntrack *ct,
- enum ip_conntrack_info conntrackinfo,
- unsigned int hooknum,
- struct sk_buff **pskb);
-
-extern int ip_nat_icmp_reply_translation(struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned int hooknum,
- struct sk_buff **pskb);
-#endif /* _IP_NAT_CORE_H */
+++ /dev/null
-#ifndef _IP_NAT_HELPER_H
-#define _IP_NAT_HELPER_H
-/* NAT protocol helper routines. */
-
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/module.h>
-
-struct sk_buff;
-
-/* These return true or false. */
-extern int ip_nat_mangle_tcp_packet(struct sk_buff **skb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned int match_offset,
- unsigned int match_len,
- const char *rep_buffer,
- unsigned int rep_len);
-extern int ip_nat_mangle_udp_packet(struct sk_buff **skb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned int match_offset,
- unsigned int match_len,
- const char *rep_buffer,
- unsigned int rep_len);
-extern int ip_nat_seq_adjust(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo);
-
-/* Setup NAT on this expected conntrack so it follows master, but goes
- * to port ct->master->saved_proto. */
-extern void ip_nat_follow_master(struct ip_conntrack *ct,
- struct ip_conntrack_expect *this);
-#endif
+++ /dev/null
-/* PPTP constants and structs */
-#ifndef _NAT_PPTP_H
-#define _NAT_PPTP_H
-
-/* conntrack private data */
-struct ip_nat_pptp {
- __be16 pns_call_id; /* NAT'ed PNS call id */
- __be16 pac_call_id; /* NAT'ed PAC call id */
-};
-
-#endif /* _NAT_PPTP_H */
+++ /dev/null
-/* Header for use in defining a given protocol. */
-#ifndef _IP_NAT_PROTOCOL_H
-#define _IP_NAT_PROTOCOL_H
-#include <linux/init.h>
-#include <linux/list.h>
-
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter/nfnetlink_conntrack.h>
-
-struct iphdr;
-struct ip_nat_range;
-
-struct ip_nat_protocol
-{
- /* Protocol name */
- const char *name;
-
- /* Protocol number. */
- unsigned int protonum;
-
- struct module *me;
-
- /* Translate a packet to the target according to manip type.
- Return true if succeeded. */
- int (*manip_pkt)(struct sk_buff **pskb,
- unsigned int iphdroff,
- const struct ip_conntrack_tuple *tuple,
- enum ip_nat_manip_type maniptype);
-
- /* Is the manipable part of the tuple between min and max incl? */
- int (*in_range)(const struct ip_conntrack_tuple *tuple,
- enum ip_nat_manip_type maniptype,
- const union ip_conntrack_manip_proto *min,
- const union ip_conntrack_manip_proto *max);
-
- /* Alter the per-proto part of the tuple (depending on
- maniptype), to give a unique tuple in the given range if
- possible; return false if not. Per-protocol part of tuple
- is initialized to the incoming packet. */
- int (*unique_tuple)(struct ip_conntrack_tuple *tuple,
- const struct ip_nat_range *range,
- enum ip_nat_manip_type maniptype,
- const struct ip_conntrack *conntrack);
-
- int (*range_to_nfattr)(struct sk_buff *skb,
- const struct ip_nat_range *range);
-
- int (*nfattr_to_range)(struct nfattr *tb[],
- struct ip_nat_range *range);
-};
-
-/* Protocol registration. */
-extern int ip_nat_protocol_register(struct ip_nat_protocol *proto);
-extern void ip_nat_protocol_unregister(struct ip_nat_protocol *proto);
-
-extern struct ip_nat_protocol *ip_nat_proto_find_get(u_int8_t protocol);
-extern void ip_nat_proto_put(struct ip_nat_protocol *proto);
-
-/* Built-in protocols. */
-extern struct ip_nat_protocol ip_nat_protocol_tcp;
-extern struct ip_nat_protocol ip_nat_protocol_udp;
-extern struct ip_nat_protocol ip_nat_protocol_icmp;
-extern struct ip_nat_protocol ip_nat_unknown_protocol;
-
-extern int init_protocols(void) __init;
-extern void cleanup_protocols(void);
-extern struct ip_nat_protocol *find_nat_proto(u_int16_t protonum);
-
-extern int ip_nat_port_range_to_nfattr(struct sk_buff *skb,
- const struct ip_nat_range *range);
-extern int ip_nat_port_nfattr_to_range(struct nfattr *tb[],
- struct ip_nat_range *range);
-
-#endif /*_IP_NAT_PROTO_H*/
+++ /dev/null
-#ifndef _IP_NAT_RULE_H
-#define _IP_NAT_RULE_H
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
-#include <linux/netfilter_ipv4/ip_nat.h>
-
-#ifdef __KERNEL__
-
-extern int ip_nat_rule_init(void) __init;
-extern void ip_nat_rule_cleanup(void);
-extern int ip_nat_rule_find(struct sk_buff **pskb,
- unsigned int hooknum,
- const struct net_device *in,
- const struct net_device *out,
- struct ip_conntrack *ct,
- struct ip_nat_info *info);
-
-extern unsigned int
-alloc_null_binding(struct ip_conntrack *conntrack,
- struct ip_nat_info *info,
- unsigned int hooknum);
-
-extern unsigned int
-alloc_null_binding_confirmed(struct ip_conntrack *conntrack,
- struct ip_nat_info *info,
- unsigned int hooknum);
-#endif
-#endif /* _IP_NAT_RULE_H */
u_int32_t *iparray;
/* hangs off end. */
- struct ip_nat_range range[IPT_SAME_MAX_RANGE];
+ struct nf_nat_range range[IPT_SAME_MAX_RANGE];
};
#endif /*_IPT_SAME_H*/
return test_bit(IPS_DYING_BIT, &ct->status);
}
+static inline int nf_ct_is_untracked(const struct sk_buff *skb)
+{
+ return (skb->nfct == &nf_conntrack_untracked.ct_general);
+}
+
extern unsigned int nf_conntrack_htable_size;
extern int nf_conntrack_checksum;
extern atomic_t nf_conntrack_count;
+++ /dev/null
-#ifndef _NF_CONNTRACK_COMPAT_H
-#define _NF_CONNTRACK_COMPAT_H
-
-#ifdef __KERNEL__
-
-#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE)
-
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/socket.h>
-
-#ifdef CONFIG_IP_NF_CONNTRACK_MARK
-static inline u_int32_t *nf_ct_get_mark(const struct sk_buff *skb,
- u_int32_t *ctinfo)
-{
- struct ip_conntrack *ct = ip_conntrack_get(skb, ctinfo);
-
- if (ct)
- return &ct->mark;
- else
- return NULL;
-}
-#endif /* CONFIG_IP_NF_CONNTRACK_MARK */
-
-#ifdef CONFIG_IP_NF_CONNTRACK_SECMARK
-static inline u_int32_t *nf_ct_get_secmark(const struct sk_buff *skb,
- u_int32_t *ctinfo)
-{
- struct ip_conntrack *ct = ip_conntrack_get(skb, ctinfo);
-
- if (ct)
- return &ct->secmark;
- else
- return NULL;
-}
-#endif /* CONFIG_IP_NF_CONNTRACK_SECMARK */
-
-#ifdef CONFIG_IP_NF_CT_ACCT
-static inline struct ip_conntrack_counter *
-nf_ct_get_counters(const struct sk_buff *skb)
-{
- enum ip_conntrack_info ctinfo;
- struct ip_conntrack *ct = ip_conntrack_get(skb, &ctinfo);
-
- if (ct)
- return ct->counters;
- else
- return NULL;
-}
-#endif /* CONFIG_IP_NF_CT_ACCT */
-
-static inline int nf_ct_is_untracked(const struct sk_buff *skb)
-{
- return (skb->nfct == &ip_conntrack_untracked.ct_general);
-}
-
-static inline void nf_ct_untrack(struct sk_buff *skb)
-{
- skb->nfct = &ip_conntrack_untracked.ct_general;
-}
-
-static inline int nf_ct_get_ctinfo(const struct sk_buff *skb,
- enum ip_conntrack_info *ctinfo)
-{
- struct ip_conntrack *ct = ip_conntrack_get(skb, ctinfo);
- return (ct != NULL);
-}
-
-static inline int nf_ct_l3proto_try_module_get(unsigned short l3proto)
-{
- need_conntrack();
- return l3proto == PF_INET ? 0 : -1;
-}
-
-static inline void nf_ct_l3proto_module_put(unsigned short l3proto)
-{
-}
-
-#else /* CONFIG_IP_NF_CONNTRACK */
-
-#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
-#include <net/netfilter/nf_conntrack.h>
-
-#ifdef CONFIG_NF_CONNTRACK_MARK
-
-static inline u_int32_t *nf_ct_get_mark(const struct sk_buff *skb,
- u_int32_t *ctinfo)
-{
- struct nf_conn *ct = nf_ct_get(skb, ctinfo);
-
- if (ct)
- return &ct->mark;
- else
- return NULL;
-}
-#endif /* CONFIG_NF_CONNTRACK_MARK */
-
-#ifdef CONFIG_NF_CONNTRACK_SECMARK
-static inline u_int32_t *nf_ct_get_secmark(const struct sk_buff *skb,
- u_int32_t *ctinfo)
-{
- struct nf_conn *ct = nf_ct_get(skb, ctinfo);
-
- if (ct)
- return &ct->secmark;
- else
- return NULL;
-}
-#endif /* CONFIG_NF_CONNTRACK_MARK */
-
-#ifdef CONFIG_NF_CT_ACCT
-static inline struct ip_conntrack_counter *
-nf_ct_get_counters(const struct sk_buff *skb)
-{
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
-
- if (ct)
- return ct->counters;
- else
- return NULL;
-}
-#endif /* CONFIG_NF_CT_ACCT */
-
-static inline int nf_ct_is_untracked(const struct sk_buff *skb)
-{
- return (skb->nfct == &nf_conntrack_untracked.ct_general);
-}
-
-static inline void nf_ct_untrack(struct sk_buff *skb)
-{
- skb->nfct = &nf_conntrack_untracked.ct_general;
-}
-
-static inline int nf_ct_get_ctinfo(const struct sk_buff *skb,
- enum ip_conntrack_info *ctinfo)
-{
- struct nf_conn *ct = nf_ct_get(skb, ctinfo);
- return (ct != NULL);
-}
-
-#endif /* CONFIG_IP_NF_CONNTRACK */
-
-#endif /* __KERNEL__ */
-
-#endif /* _NF_CONNTRACK_COMPAT_H */
#include <net/netfilter/nf_nat.h>
#include <linux/netfilter_ipv4/ip_tables.h>
-/* Compatibility definitions for ipt_FOO modules */
-#define ip_nat_range nf_nat_range
-#define ip_conntrack_tuple nf_conntrack_tuple
-#define ip_conntrack_get nf_ct_get
-#define ip_conntrack nf_conn
-#define ip_nat_setup_info nf_nat_setup_info
-#define ip_nat_multi_range_compat nf_nat_multi_range_compat
-#define ip_ct_iterate_cleanup nf_ct_iterate_cleanup
-#define IP_NF_ASSERT NF_CT_ASSERT
-
extern int nf_nat_rule_init(void) __init;
extern void nf_nat_rule_cleanup(void);
extern int nf_nat_rule_find(struct sk_buff **pskb,
If unsure, say Y.
-# connection tracking, helpers and protocols
-config IP_NF_CT_ACCT
- bool "Connection tracking flow accounting"
- depends on IP_NF_CONNTRACK
- help
- If this option is enabled, the connection tracking code will
- keep per-flow packet and byte counters.
-
- Those counters can be used for flow-based accounting or the
- `connbytes' match.
-
- If unsure, say `N'.
-
-config IP_NF_CONNTRACK_MARK
- bool 'Connection mark tracking support'
- depends on IP_NF_CONNTRACK
- help
- This option enables support for connection marks, used by the
- `CONNMARK' target and `connmark' match. Similar to the mark value
- of packets, but this mark value is kept in the conntrack session
- instead of the individual packets.
-
-config IP_NF_CONNTRACK_SECMARK
- bool 'Connection tracking security mark support'
- depends on IP_NF_CONNTRACK && NETWORK_SECMARK
- help
- This option enables security markings to be applied to
- connections. Typically they are copied to connections from
- packets using the CONNSECMARK target and copied back from
- connections to packets with the same target, with the packets
- being originally labeled via SECMARK.
-
- If unsure, say 'N'.
-
-config IP_NF_CONNTRACK_EVENTS
- bool "Connection tracking events (EXPERIMENTAL)"
- depends on EXPERIMENTAL && IP_NF_CONNTRACK
- help
- If this option is enabled, the connection tracking code will
- provide a notifier chain that can be used by other kernel code
- to get notified about changes in the connection tracking state.
-
- IF unsure, say `N'.
-
-config IP_NF_CONNTRACK_NETLINK
- tristate 'Connection tracking netlink interface (EXPERIMENTAL)'
- depends on EXPERIMENTAL && IP_NF_CONNTRACK && NETFILTER_NETLINK
- depends on IP_NF_CONNTRACK!=y || NETFILTER_NETLINK!=m
- depends on IP_NF_NAT=n || IP_NF_NAT
- help
- This option enables support for a netlink-based userspace interface
-
-
-config IP_NF_CT_PROTO_SCTP
- tristate 'SCTP protocol connection tracking support (EXPERIMENTAL)'
- depends on IP_NF_CONNTRACK && EXPERIMENTAL
- help
- With this option enabled, the connection tracking code will
- be able to do state tracking on SCTP connections.
-
- If you want to compile it as a module, say M here and read
- <file:Documentation/modules.txt>. If unsure, say `N'.
-
-config IP_NF_FTP
- tristate "FTP protocol support"
- depends on IP_NF_CONNTRACK
- help
- Tracking FTP connections is problematic: special helpers are
- required for tracking them, and doing masquerading and other forms
- of Network Address Translation on them.
-
- To compile it as a module, choose M here. If unsure, say Y.
-
-config IP_NF_IRC
- tristate "IRC protocol support"
- depends on IP_NF_CONNTRACK
- ---help---
- There is a commonly-used extension to IRC called
- Direct Client-to-Client Protocol (DCC). This enables users to send
- files to each other, and also chat to each other without the need
- of a server. DCC Sending is used anywhere you send files over IRC,
- and DCC Chat is most commonly used by Eggdrop bots. If you are
- using NAT, this extension will enable you to send files and initiate
- chats. Note that you do NOT need this extension to get files or
- have others initiate chats, or everything else in IRC.
-
- To compile it as a module, choose M here. If unsure, say Y.
-
-config IP_NF_NETBIOS_NS
- tristate "NetBIOS name service protocol support (EXPERIMENTAL)"
- depends on IP_NF_CONNTRACK && EXPERIMENTAL
- help
- NetBIOS name service requests are sent as broadcast messages from an
- unprivileged port and responded to with unicast messages to the
- same port. This make them hard to firewall properly because connection
- tracking doesn't deal with broadcasts. This helper tracks locally
- originating NetBIOS name service requests and the corresponding
- responses. It relies on correct IP address configuration, specifically
- netmask and broadcast address. When properly configured, the output
- of "ip address show" should look similar to this:
-
- $ ip -4 address show eth0
- 4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
- inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
-
- To compile it as a module, choose M here. If unsure, say N.
-
-config IP_NF_TFTP
- tristate "TFTP protocol support"
- depends on IP_NF_CONNTRACK
- help
- TFTP connection tracking helper, this is required depending
- on how restrictive your ruleset is.
- If you are using a tftp client behind -j SNAT or -j MASQUERADING
- you will need this.
-
- To compile it as a module, choose M here. If unsure, say Y.
-
-config IP_NF_AMANDA
- tristate "Amanda backup protocol support"
- depends on IP_NF_CONNTRACK
- select TEXTSEARCH
- select TEXTSEARCH_KMP
- help
- If you are running the Amanda backup package <http://www.amanda.org/>
- on this machine or machines that will be MASQUERADED through this
- machine, then you may want to enable this feature. This allows the
- connection tracking and natting code to allow the sub-channels that
- Amanda requires for communication of the backup data, messages and
- index.
-
- To compile it as a module, choose M here. If unsure, say Y.
-
-config IP_NF_PPTP
- tristate 'PPTP protocol support'
- depends on IP_NF_CONNTRACK
- help
- This module adds support for PPTP (Point to Point Tunnelling
- Protocol, RFC2637) connection tracking and NAT.
-
- If you are running PPTP sessions over a stateful firewall or NAT
- box, you may want to enable this feature.
-
- Please note that not all PPTP modes of operation are supported yet.
- For more info, read top of the file
- net/ipv4/netfilter/ip_conntrack_pptp.c
-
- If you want to compile it as a module, say M here and read
- Documentation/modules.txt. If unsure, say `N'.
-
-config IP_NF_H323
- tristate 'H.323 protocol support (EXPERIMENTAL)'
- depends on IP_NF_CONNTRACK && EXPERIMENTAL
- help
- H.323 is a VoIP signalling protocol from ITU-T. As one of the most
- important VoIP protocols, it is widely used by voice hardware and
- software including voice gateways, IP phones, Netmeeting, OpenPhone,
- Gnomemeeting, etc.
-
- With this module you can support H.323 on a connection tracking/NAT
- firewall.
-
- This module supports RAS, Fast Start, H.245 Tunnelling, Call
- Forwarding, RTP/RTCP and T.120 based audio, video, fax, chat,
- whiteboard, file transfer, etc. For more information, please
- visit http://nath323.sourceforge.net/.
-
- If you want to compile it as a module, say 'M' here and read
- Documentation/modules.txt. If unsure, say 'N'.
-
-config IP_NF_SIP
- tristate "SIP protocol support (EXPERIMENTAL)"
- depends on IP_NF_CONNTRACK && EXPERIMENTAL
- help
- SIP is an application-layer control protocol that can establish,
- modify, and terminate multimedia sessions (conferences) such as
- Internet telephony calls. With the ip_conntrack_sip and
- the ip_nat_sip modules you can support the protocol on a connection
- tracking/NATing firewall.
-
- To compile it as a module, choose M here. If unsure, say Y.
-
config IP_NF_QUEUE
tristate "IP Userspace queueing via NETLINK (OBSOLETE)"
help
To compile it as a module, choose M here. If unsure, say N.
-# NAT + specific targets: ip_conntrack
-config IP_NF_NAT
- tristate "Full NAT"
- depends on IP_NF_IPTABLES && IP_NF_CONNTRACK
- help
- The Full NAT option allows masquerading, port forwarding and other
- forms of full Network Address Port Translation. It is controlled by
- the `nat' table in iptables: see the man page for iptables(8).
-
- To compile it as a module, choose M here. If unsure, say N.
-
# NAT + specific targets: nf_conntrack
config NF_NAT
tristate "Full NAT"
To compile it as a module, choose M here. If unsure, say N.
-config IP_NF_NAT_NEEDED
- bool
- depends on IP_NF_NAT
- default y
-
config NF_NAT_NEEDED
bool
depends on NF_NAT
config IP_NF_TARGET_MASQUERADE
tristate "MASQUERADE target support"
- depends on (NF_NAT || IP_NF_NAT)
+ depends on NF_NAT
help
Masquerading is a special case of NAT: all outgoing connections are
changed to seem to come from a particular interface's address, and
config IP_NF_TARGET_REDIRECT
tristate "REDIRECT target support"
- depends on (NF_NAT || IP_NF_NAT)
+ depends on NF_NAT
help
REDIRECT is a special case of NAT: all incoming connections are
mapped onto the incoming interface's address, causing the packets to
config IP_NF_TARGET_NETMAP
tristate "NETMAP target support"
- depends on (NF_NAT || IP_NF_NAT)
+ depends on NF_NAT
help
NETMAP is an implementation of static 1:1 NAT mapping of network
addresses. It maps the network address part, while keeping the host
config IP_NF_TARGET_SAME
tristate "SAME target support"
- depends on (NF_NAT || IP_NF_NAT)
+ depends on NF_NAT
help
This option adds a `SAME' target, which works like the standard SNAT
target, but attempts to give clients the same IP for all connections.
To compile it as a module, choose M here. If unsure, say N.
-config IP_NF_NAT_SNMP_BASIC
- tristate "Basic SNMP-ALG support (EXPERIMENTAL)"
- depends on EXPERIMENTAL && IP_NF_NAT
- ---help---
-
- This module implements an Application Layer Gateway (ALG) for
- SNMP payloads. In conjunction with NAT, it allows a network
- management system to access multiple private networks with
- conflicting addresses. It works by modifying IP addresses
- inside SNMP payloads to match IP-layer NAT mapping.
-
- This is the "basic" form of SNMP-ALG, as described in RFC 2962
-
- To compile it as a module, choose M here. If unsure, say N.
-
config NF_NAT_SNMP_BASIC
tristate "Basic SNMP-ALG support (EXPERIMENTAL)"
depends on EXPERIMENTAL && NF_NAT
tristate
depends on NF_NAT && NF_CT_PROTO_GRE
-config IP_NF_NAT_FTP
- tristate
- depends on IP_NF_IPTABLES && IP_NF_CONNTRACK && IP_NF_NAT
- default IP_NF_NAT && IP_NF_FTP
-
config NF_NAT_FTP
tristate
depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_FTP
-config IP_NF_NAT_IRC
- tristate
- depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
- default IP_NF_NAT if IP_NF_IRC=y
- default m if IP_NF_IRC=m
-
config NF_NAT_IRC
tristate
depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_IRC
-config IP_NF_NAT_TFTP
- tristate
- depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
- default IP_NF_NAT if IP_NF_TFTP=y
- default m if IP_NF_TFTP=m
-
config NF_NAT_TFTP
tristate
depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_TFTP
-config IP_NF_NAT_AMANDA
- tristate
- depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
- default IP_NF_NAT if IP_NF_AMANDA=y
- default m if IP_NF_AMANDA=m
-
config NF_NAT_AMANDA
tristate
depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_AMANDA
-config IP_NF_NAT_PPTP
- tristate
- depends on IP_NF_NAT!=n && IP_NF_PPTP!=n
- default IP_NF_NAT if IP_NF_PPTP=y
- default m if IP_NF_PPTP=m
-
config NF_NAT_PPTP
tristate
depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_PPTP
select NF_NAT_PROTO_GRE
-config IP_NF_NAT_H323
- tristate
- depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
- default IP_NF_NAT if IP_NF_H323=y
- default m if IP_NF_H323=m
-
config NF_NAT_H323
tristate
depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_H323
-config IP_NF_NAT_SIP
- tristate
- depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
- default IP_NF_NAT if IP_NF_SIP=y
- default m if IP_NF_SIP=m
-
config NF_NAT_SIP
tristate
depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
config IP_NF_TARGET_CLUSTERIP
tristate "CLUSTERIP target support (EXPERIMENTAL)"
depends on IP_NF_MANGLE && EXPERIMENTAL
- depends on IP_NF_CONNTRACK || NF_CONNTRACK_IPV4
- select IP_NF_CONNTRACK_MARK if IP_NF_CONNTRACK
- select NF_CONNTRACK_MARK if NF_CONNTRACK_IPV4
+ depends on NF_CONNTRACK_IPV4
+ select NF_CONNTRACK_MARK
help
The CLUSTERIP target allows you to build load-balancing clusters of
network servers without having a dedicated load-balancing
# Makefile for the netfilter modules on top of IPv4.
#
-# objects for the standalone - connection tracking / NAT
-ip_conntrack-objs := ip_conntrack_standalone.o ip_conntrack_core.o ip_conntrack_proto_generic.o ip_conntrack_proto_tcp.o ip_conntrack_proto_udp.o ip_conntrack_proto_icmp.o
# objects for l3 independent conntrack
nf_conntrack_ipv4-objs := nf_conntrack_l3proto_ipv4.o nf_conntrack_proto_icmp.o
ifeq ($(CONFIG_NF_CONNTRACK_PROC_COMPAT),y)
endif
endif
-ip_nat-objs := ip_nat_core.o ip_nat_helper.o ip_nat_proto_unknown.o ip_nat_proto_tcp.o ip_nat_proto_udp.o ip_nat_proto_icmp.o
-nf_nat-objs := nf_nat_core.o nf_nat_helper.o nf_nat_proto_unknown.o nf_nat_proto_tcp.o nf_nat_proto_udp.o nf_nat_proto_icmp.o
-ifneq ($(CONFIG_NF_NAT),)
+nf_nat-objs := nf_nat_core.o nf_nat_helper.o nf_nat_proto_unknown.o nf_nat_proto_tcp.o nf_nat_proto_udp.o nf_nat_proto_icmp.o
iptable_nat-objs := nf_nat_rule.o nf_nat_standalone.o
-else
-iptable_nat-objs := ip_nat_rule.o ip_nat_standalone.o
-endif
-
-ip_conntrack_pptp-objs := ip_conntrack_helper_pptp.o ip_conntrack_proto_gre.o
-ip_nat_pptp-objs := ip_nat_helper_pptp.o ip_nat_proto_gre.o
-
-ip_conntrack_h323-objs := ip_conntrack_helper_h323.o ../../netfilter/nf_conntrack_h323_asn1.o
-ip_nat_h323-objs := ip_nat_helper_h323.o
# connection tracking
-obj-$(CONFIG_IP_NF_CONNTRACK) += ip_conntrack.o
obj-$(CONFIG_NF_CONNTRACK_IPV4) += nf_conntrack_ipv4.o
-obj-$(CONFIG_IP_NF_NAT) += ip_nat.o
obj-$(CONFIG_NF_NAT) += nf_nat.o
-# conntrack netlink interface
-obj-$(CONFIG_IP_NF_CONNTRACK_NETLINK) += ip_conntrack_netlink.o
-
-
-# SCTP protocol connection tracking
-obj-$(CONFIG_IP_NF_CT_PROTO_SCTP) += ip_conntrack_proto_sctp.o
-
-# connection tracking helpers
-obj-$(CONFIG_IP_NF_H323) += ip_conntrack_h323.o
-obj-$(CONFIG_IP_NF_PPTP) += ip_conntrack_pptp.o
-obj-$(CONFIG_IP_NF_AMANDA) += ip_conntrack_amanda.o
-obj-$(CONFIG_IP_NF_TFTP) += ip_conntrack_tftp.o
-obj-$(CONFIG_IP_NF_FTP) += ip_conntrack_ftp.o
-obj-$(CONFIG_IP_NF_IRC) += ip_conntrack_irc.o
-obj-$(CONFIG_IP_NF_SIP) += ip_conntrack_sip.o
-obj-$(CONFIG_IP_NF_NETBIOS_NS) += ip_conntrack_netbios_ns.o
-
-# NAT helpers (ip_conntrack)
-obj-$(CONFIG_IP_NF_NAT_H323) += ip_nat_h323.o
-obj-$(CONFIG_IP_NF_NAT_PPTP) += ip_nat_pptp.o
-obj-$(CONFIG_IP_NF_NAT_AMANDA) += ip_nat_amanda.o
-obj-$(CONFIG_IP_NF_NAT_TFTP) += ip_nat_tftp.o
-obj-$(CONFIG_IP_NF_NAT_FTP) += ip_nat_ftp.o
-obj-$(CONFIG_IP_NF_NAT_IRC) += ip_nat_irc.o
-obj-$(CONFIG_IP_NF_NAT_SIP) += ip_nat_sip.o
-
# NAT helpers (nf_conntrack)
obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_amanda.o
obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
# the three instances of ip_tables
obj-$(CONFIG_IP_NF_FILTER) += iptable_filter.o
obj-$(CONFIG_IP_NF_MANGLE) += iptable_mangle.o
-obj-$(CONFIG_IP_NF_NAT) += iptable_nat.o
obj-$(CONFIG_NF_NAT) += iptable_nat.o
obj-$(CONFIG_IP_NF_RAW) += iptable_raw.o
obj-$(CONFIG_IP_NF_TARGET_REDIRECT) += ipt_REDIRECT.o
obj-$(CONFIG_IP_NF_TARGET_NETMAP) += ipt_NETMAP.o
obj-$(CONFIG_IP_NF_TARGET_SAME) += ipt_SAME.o
-obj-$(CONFIG_IP_NF_NAT_SNMP_BASIC) += ip_nat_snmp_basic.o
obj-$(CONFIG_IP_NF_TARGET_LOG) += ipt_LOG.o
obj-$(CONFIG_IP_NF_TARGET_ULOG) += ipt_ULOG.o
obj-$(CONFIG_IP_NF_TARGET_CLUSTERIP) += ipt_CLUSTERIP.o
+++ /dev/null
-/* Amanda extension for IP connection tracking, Version 0.2
- * (C) 2002 by Brian J. Murrell <netfilter@interlinx.bc.ca>
- * based on HW's ip_conntrack_irc.c as well as other modules
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * Module load syntax:
- * insmod ip_conntrack_amanda.o [master_timeout=n]
- *
- * Where master_timeout is the timeout (in seconds) of the master
- * connection (port 10080). This defaults to 5 minutes but if
- * your clients take longer than 5 minutes to do their work
- * before getting back to the Amanda server, you can increase
- * this value.
- *
- */
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/textsearch.h>
-#include <linux/skbuff.h>
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/udp.h>
-
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_amanda.h>
-
-static unsigned int master_timeout = 300;
-static char *ts_algo = "kmp";
-
-MODULE_AUTHOR("Brian J. Murrell <netfilter@interlinx.bc.ca>");
-MODULE_DESCRIPTION("Amanda connection tracking module");
-MODULE_LICENSE("GPL");
-module_param(master_timeout, uint, 0600);
-MODULE_PARM_DESC(master_timeout, "timeout for the master connection");
-module_param(ts_algo, charp, 0400);
-MODULE_PARM_DESC(ts_algo, "textsearch algorithm to use (default kmp)");
-
-unsigned int (*ip_nat_amanda_hook)(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- unsigned int matchoff,
- unsigned int matchlen,
- struct ip_conntrack_expect *exp);
-EXPORT_SYMBOL_GPL(ip_nat_amanda_hook);
-
-enum amanda_strings {
- SEARCH_CONNECT,
- SEARCH_NEWLINE,
- SEARCH_DATA,
- SEARCH_MESG,
- SEARCH_INDEX,
-};
-
-static struct {
- char *string;
- size_t len;
- struct ts_config *ts;
-} search[] = {
- [SEARCH_CONNECT] = {
- .string = "CONNECT ",
- .len = 8,
- },
- [SEARCH_NEWLINE] = {
- .string = "\n",
- .len = 1,
- },
- [SEARCH_DATA] = {
- .string = "DATA ",
- .len = 5,
- },
- [SEARCH_MESG] = {
- .string = "MESG ",
- .len = 5,
- },
- [SEARCH_INDEX] = {
- .string = "INDEX ",
- .len = 6,
- },
-};
-
-static int help(struct sk_buff **pskb,
- struct ip_conntrack *ct, enum ip_conntrack_info ctinfo)
-{
- struct ts_state ts;
- struct ip_conntrack_expect *exp;
- unsigned int dataoff, start, stop, off, i;
- char pbuf[sizeof("65535")], *tmp;
- u_int16_t port, len;
- int ret = NF_ACCEPT;
- typeof(ip_nat_amanda_hook) ip_nat_amanda;
-
- /* Only look at packets from the Amanda server */
- if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL)
- return NF_ACCEPT;
-
- /* increase the UDP timeout of the master connection as replies from
- * Amanda clients to the server can be quite delayed */
- ip_ct_refresh(ct, *pskb, master_timeout * HZ);
-
- /* No data? */
- dataoff = ip_hdrlen(*pskb) + sizeof(struct udphdr);
- if (dataoff >= (*pskb)->len) {
- if (net_ratelimit())
- printk("amanda_help: skblen = %u\n", (*pskb)->len);
- return NF_ACCEPT;
- }
-
- memset(&ts, 0, sizeof(ts));
- start = skb_find_text(*pskb, dataoff, (*pskb)->len,
- search[SEARCH_CONNECT].ts, &ts);
- if (start == UINT_MAX)
- goto out;
- start += dataoff + search[SEARCH_CONNECT].len;
-
- memset(&ts, 0, sizeof(ts));
- stop = skb_find_text(*pskb, start, (*pskb)->len,
- search[SEARCH_NEWLINE].ts, &ts);
- if (stop == UINT_MAX)
- goto out;
- stop += start;
-
- for (i = SEARCH_DATA; i <= SEARCH_INDEX; i++) {
- memset(&ts, 0, sizeof(ts));
- off = skb_find_text(*pskb, start, stop, search[i].ts, &ts);
- if (off == UINT_MAX)
- continue;
- off += start + search[i].len;
-
- len = min_t(unsigned int, sizeof(pbuf) - 1, stop - off);
- if (skb_copy_bits(*pskb, off, pbuf, len))
- break;
- pbuf[len] = '\0';
-
- port = simple_strtoul(pbuf, &tmp, 10);
- len = tmp - pbuf;
- if (port == 0 || len > 5)
- break;
-
- exp = ip_conntrack_expect_alloc(ct);
- if (exp == NULL) {
- ret = NF_DROP;
- goto out;
- }
-
- exp->expectfn = NULL;
- exp->flags = 0;
-
- exp->tuple.src.ip = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip;
- exp->tuple.src.u.tcp.port = 0;
- exp->tuple.dst.ip = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip;
- exp->tuple.dst.protonum = IPPROTO_TCP;
- exp->tuple.dst.u.tcp.port = htons(port);
-
- exp->mask.src.ip = htonl(0xFFFFFFFF);
- exp->mask.src.u.tcp.port = 0;
- exp->mask.dst.ip = htonl(0xFFFFFFFF);
- exp->mask.dst.protonum = 0xFF;
- exp->mask.dst.u.tcp.port = htons(0xFFFF);
-
- /* RCU read locked by nf_hook_slow */
- ip_nat_amanda = rcu_dereference(ip_nat_amanda_hook);
- if (ip_nat_amanda)
- ret = ip_nat_amanda(pskb, ctinfo, off - dataoff,
- len, exp);
- else if (ip_conntrack_expect_related(exp) != 0)
- ret = NF_DROP;
- ip_conntrack_expect_put(exp);
- }
-
-out:
- return ret;
-}
-
-static struct ip_conntrack_helper amanda_helper = {
- .max_expected = 3,
- .timeout = 180,
- .me = THIS_MODULE,
- .help = help,
- .name = "amanda",
-
- .tuple = { .src = { .u = { .udp = {.port = __constant_htons(10080) } } },
- .dst = { .protonum = IPPROTO_UDP },
- },
- .mask = { .src = { .u = { 0xFFFF } },
- .dst = { .protonum = 0xFF },
- },
-};
-
-static void __exit ip_conntrack_amanda_fini(void)
-{
- int i;
-
- ip_conntrack_helper_unregister(&amanda_helper);
- for (i = 0; i < ARRAY_SIZE(search); i++)
- textsearch_destroy(search[i].ts);
-}
-
-static int __init ip_conntrack_amanda_init(void)
-{
- int ret, i;
-
- ret = -ENOMEM;
- for (i = 0; i < ARRAY_SIZE(search); i++) {
- search[i].ts = textsearch_prepare(ts_algo, search[i].string,
- search[i].len,
- GFP_KERNEL, TS_AUTOLOAD);
- if (search[i].ts == NULL)
- goto err;
- }
- ret = ip_conntrack_helper_register(&amanda_helper);
- if (ret < 0)
- goto err;
- return 0;
-
-err:
- for (; i >= 0; i--) {
- if (search[i].ts)
- textsearch_destroy(search[i].ts);
- }
- return ret;
-}
-
-module_init(ip_conntrack_amanda_init);
-module_exit(ip_conntrack_amanda_fini);
+++ /dev/null
-/* Connection state tracking for netfilter. This is separated from,
- but required by, the NAT layer; it can also be used by an iptables
- extension. */
-
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * 23 Apr 2001: Harald Welte <laforge@gnumonks.org>
- * - new API and handling of conntrack/nat helpers
- * - now capable of multiple expectations for one master
- * 16 Jul 2002: Harald Welte <laforge@gnumonks.org>
- * - add usage/reference counts to ip_conntrack_expect
- * - export ip_conntrack[_expect]_{find_get,put} functions
- * */
-
-#include <linux/types.h>
-#include <linux/icmp.h>
-#include <linux/ip.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/proc_fs.h>
-#include <linux/vmalloc.h>
-#include <net/checksum.h>
-#include <net/ip.h>
-#include <linux/stddef.h>
-#include <linux/sysctl.h>
-#include <linux/slab.h>
-#include <linux/random.h>
-#include <linux/jhash.h>
-#include <linux/err.h>
-#include <linux/percpu.h>
-#include <linux/moduleparam.h>
-#include <linux/notifier.h>
-
-/* ip_conntrack_lock protects the main hash table, protocol/helper/expected
- registrations, conntrack timers*/
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_core.h>
-
-#define IP_CONNTRACK_VERSION "2.4"
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-DEFINE_RWLOCK(ip_conntrack_lock);
-
-/* ip_conntrack_standalone needs this */
-atomic_t ip_conntrack_count = ATOMIC_INIT(0);
-
-void (*ip_conntrack_destroyed)(struct ip_conntrack *conntrack) = NULL;
-LIST_HEAD(ip_conntrack_expect_list);
-struct ip_conntrack_protocol *ip_ct_protos[MAX_IP_CT_PROTO] __read_mostly;
-static LIST_HEAD(helpers);
-unsigned int ip_conntrack_htable_size __read_mostly = 0;
-int ip_conntrack_max __read_mostly;
-struct list_head *ip_conntrack_hash __read_mostly;
-static struct kmem_cache *ip_conntrack_cachep __read_mostly;
-static struct kmem_cache *ip_conntrack_expect_cachep __read_mostly;
-struct ip_conntrack ip_conntrack_untracked;
-unsigned int ip_ct_log_invalid __read_mostly;
-static LIST_HEAD(unconfirmed);
-static int ip_conntrack_vmalloc __read_mostly;
-
-static unsigned int ip_conntrack_next_id;
-static unsigned int ip_conntrack_expect_next_id;
-#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
-ATOMIC_NOTIFIER_HEAD(ip_conntrack_chain);
-ATOMIC_NOTIFIER_HEAD(ip_conntrack_expect_chain);
-
-DEFINE_PER_CPU(struct ip_conntrack_ecache, ip_conntrack_ecache);
-
-/* deliver cached events and clear cache entry - must be called with locally
- * disabled softirqs */
-static inline void
-__ip_ct_deliver_cached_events(struct ip_conntrack_ecache *ecache)
-{
- DEBUGP("ecache: delivering events for %p\n", ecache->ct);
- if (is_confirmed(ecache->ct) && !is_dying(ecache->ct) && ecache->events)
- atomic_notifier_call_chain(&ip_conntrack_chain, ecache->events,
- ecache->ct);
- ecache->events = 0;
- ip_conntrack_put(ecache->ct);
- ecache->ct = NULL;
-}
-
-/* Deliver all cached events for a particular conntrack. This is called
- * by code prior to async packet handling or freeing the skb */
-void ip_ct_deliver_cached_events(const struct ip_conntrack *ct)
-{
- struct ip_conntrack_ecache *ecache;
-
- local_bh_disable();
- ecache = &__get_cpu_var(ip_conntrack_ecache);
- if (ecache->ct == ct)
- __ip_ct_deliver_cached_events(ecache);
- local_bh_enable();
-}
-
-void __ip_ct_event_cache_init(struct ip_conntrack *ct)
-{
- struct ip_conntrack_ecache *ecache;
-
- /* take care of delivering potentially old events */
- ecache = &__get_cpu_var(ip_conntrack_ecache);
- BUG_ON(ecache->ct == ct);
- if (ecache->ct)
- __ip_ct_deliver_cached_events(ecache);
- /* initialize for this conntrack/packet */
- ecache->ct = ct;
- nf_conntrack_get(&ct->ct_general);
-}
-
-/* flush the event cache - touches other CPU's data and must not be called while
- * packets are still passing through the code */
-static void ip_ct_event_cache_flush(void)
-{
- struct ip_conntrack_ecache *ecache;
- int cpu;
-
- for_each_possible_cpu(cpu) {
- ecache = &per_cpu(ip_conntrack_ecache, cpu);
- if (ecache->ct)
- ip_conntrack_put(ecache->ct);
- }
-}
-#else
-static inline void ip_ct_event_cache_flush(void) {}
-#endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
-
-DEFINE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
-
-static int ip_conntrack_hash_rnd_initted;
-static unsigned int ip_conntrack_hash_rnd;
-
-static u_int32_t __hash_conntrack(const struct ip_conntrack_tuple *tuple,
- unsigned int size, unsigned int rnd)
-{
- return (jhash_3words((__force u32)tuple->src.ip,
- ((__force u32)tuple->dst.ip ^ tuple->dst.protonum),
- (tuple->src.u.all | (tuple->dst.u.all << 16)),
- rnd) % size);
-}
-
-static u_int32_t
-hash_conntrack(const struct ip_conntrack_tuple *tuple)
-{
- return __hash_conntrack(tuple, ip_conntrack_htable_size,
- ip_conntrack_hash_rnd);
-}
-
-int
-ip_ct_get_tuple(const struct iphdr *iph,
- const struct sk_buff *skb,
- unsigned int dataoff,
- struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack_protocol *protocol)
-{
- /* Never happen */
- if (iph->frag_off & htons(IP_OFFSET)) {
- printk("ip_conntrack_core: Frag of proto %u.\n",
- iph->protocol);
- return 0;
- }
-
- tuple->src.ip = iph->saddr;
- tuple->dst.ip = iph->daddr;
- tuple->dst.protonum = iph->protocol;
- tuple->dst.dir = IP_CT_DIR_ORIGINAL;
-
- return protocol->pkt_to_tuple(skb, dataoff, tuple);
-}
-
-int
-ip_ct_invert_tuple(struct ip_conntrack_tuple *inverse,
- const struct ip_conntrack_tuple *orig,
- const struct ip_conntrack_protocol *protocol)
-{
- inverse->src.ip = orig->dst.ip;
- inverse->dst.ip = orig->src.ip;
- inverse->dst.protonum = orig->dst.protonum;
- inverse->dst.dir = !orig->dst.dir;
-
- return protocol->invert_tuple(inverse, orig);
-}
-
-
-/* ip_conntrack_expect helper functions */
-void ip_ct_unlink_expect(struct ip_conntrack_expect *exp)
-{
- IP_NF_ASSERT(!timer_pending(&exp->timeout));
- list_del(&exp->list);
- CONNTRACK_STAT_INC(expect_delete);
- exp->master->expecting--;
- ip_conntrack_expect_put(exp);
-}
-
-static void expectation_timed_out(unsigned long ul_expect)
-{
- struct ip_conntrack_expect *exp = (void *)ul_expect;
-
- write_lock_bh(&ip_conntrack_lock);
- ip_ct_unlink_expect(exp);
- write_unlock_bh(&ip_conntrack_lock);
- ip_conntrack_expect_put(exp);
-}
-
-struct ip_conntrack_expect *
-__ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple)
-{
- struct ip_conntrack_expect *i;
-
- list_for_each_entry(i, &ip_conntrack_expect_list, list) {
- if (ip_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask))
- return i;
- }
- return NULL;
-}
-
-/* Just find a expectation corresponding to a tuple. */
-struct ip_conntrack_expect *
-ip_conntrack_expect_find_get(const struct ip_conntrack_tuple *tuple)
-{
- struct ip_conntrack_expect *i;
-
- read_lock_bh(&ip_conntrack_lock);
- i = __ip_conntrack_expect_find(tuple);
- if (i)
- atomic_inc(&i->use);
- read_unlock_bh(&ip_conntrack_lock);
-
- return i;
-}
-
-/* If an expectation for this connection is found, it gets delete from
- * global list then returned. */
-static struct ip_conntrack_expect *
-find_expectation(const struct ip_conntrack_tuple *tuple)
-{
- struct ip_conntrack_expect *i;
-
- list_for_each_entry(i, &ip_conntrack_expect_list, list) {
- /* If master is not in hash table yet (ie. packet hasn't left
- this machine yet), how can other end know about expected?
- Hence these are not the droids you are looking for (if
- master ct never got confirmed, we'd hold a reference to it
- and weird things would happen to future packets). */
- if (ip_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask)
- && is_confirmed(i->master)) {
- if (i->flags & IP_CT_EXPECT_PERMANENT) {
- atomic_inc(&i->use);
- return i;
- } else if (del_timer(&i->timeout)) {
- ip_ct_unlink_expect(i);
- return i;
- }
- }
- }
- return NULL;
-}
-
-/* delete all expectations for this conntrack */
-void ip_ct_remove_expectations(struct ip_conntrack *ct)
-{
- struct ip_conntrack_expect *i, *tmp;
-
- /* Optimization: most connection never expect any others. */
- if (ct->expecting == 0)
- return;
-
- list_for_each_entry_safe(i, tmp, &ip_conntrack_expect_list, list) {
- if (i->master == ct && del_timer(&i->timeout)) {
- ip_ct_unlink_expect(i);
- ip_conntrack_expect_put(i);
- }
- }
-}
-
-static void
-clean_from_lists(struct ip_conntrack *ct)
-{
- DEBUGP("clean_from_lists(%p)\n", ct);
- list_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
- list_del(&ct->tuplehash[IP_CT_DIR_REPLY].list);
-
- /* Destroy all pending expectations */
- ip_ct_remove_expectations(ct);
-}
-
-static void
-destroy_conntrack(struct nf_conntrack *nfct)
-{
- struct ip_conntrack *ct = (struct ip_conntrack *)nfct;
- struct ip_conntrack_protocol *proto;
- struct ip_conntrack_helper *helper;
- typeof(ip_conntrack_destroyed) destroyed;
-
- DEBUGP("destroy_conntrack(%p)\n", ct);
- IP_NF_ASSERT(atomic_read(&nfct->use) == 0);
- IP_NF_ASSERT(!timer_pending(&ct->timeout));
-
- ip_conntrack_event(IPCT_DESTROY, ct);
- set_bit(IPS_DYING_BIT, &ct->status);
-
- helper = ct->helper;
- if (helper && helper->destroy)
- helper->destroy(ct);
-
- /* To make sure we don't get any weird locking issues here:
- * destroy_conntrack() MUST NOT be called with a write lock
- * to ip_conntrack_lock!!! -HW */
- rcu_read_lock();
- proto = __ip_conntrack_proto_find(ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
- if (proto && proto->destroy)
- proto->destroy(ct);
-
- destroyed = rcu_dereference(ip_conntrack_destroyed);
- if (destroyed)
- destroyed(ct);
-
- rcu_read_unlock();
-
- write_lock_bh(&ip_conntrack_lock);
- /* Expectations will have been removed in clean_from_lists,
- * except TFTP can create an expectation on the first packet,
- * before connection is in the list, so we need to clean here,
- * too. */
- ip_ct_remove_expectations(ct);
-
- /* We overload first tuple to link into unconfirmed list. */
- if (!is_confirmed(ct)) {
- BUG_ON(list_empty(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list));
- list_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
- }
-
- CONNTRACK_STAT_INC(delete);
- write_unlock_bh(&ip_conntrack_lock);
-
- if (ct->master)
- ip_conntrack_put(ct->master);
-
- DEBUGP("destroy_conntrack: returning ct=%p to slab\n", ct);
- ip_conntrack_free(ct);
-}
-
-static void death_by_timeout(unsigned long ul_conntrack)
-{
- struct ip_conntrack *ct = (void *)ul_conntrack;
-
- write_lock_bh(&ip_conntrack_lock);
- /* Inside lock so preempt is disabled on module removal path.
- * Otherwise we can get spurious warnings. */
- CONNTRACK_STAT_INC(delete_list);
- clean_from_lists(ct);
- write_unlock_bh(&ip_conntrack_lock);
- ip_conntrack_put(ct);
-}
-
-struct ip_conntrack_tuple_hash *
-__ip_conntrack_find(const struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack *ignored_conntrack)
-{
- struct ip_conntrack_tuple_hash *h;
- unsigned int hash = hash_conntrack(tuple);
-
- list_for_each_entry(h, &ip_conntrack_hash[hash], list) {
- if (tuplehash_to_ctrack(h) != ignored_conntrack &&
- ip_ct_tuple_equal(tuple, &h->tuple)) {
- CONNTRACK_STAT_INC(found);
- return h;
- }
- CONNTRACK_STAT_INC(searched);
- }
-
- return NULL;
-}
-
-/* Find a connection corresponding to a tuple. */
-struct ip_conntrack_tuple_hash *
-ip_conntrack_find_get(const struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack *ignored_conntrack)
-{
- struct ip_conntrack_tuple_hash *h;
-
- read_lock_bh(&ip_conntrack_lock);
- h = __ip_conntrack_find(tuple, ignored_conntrack);
- if (h)
- atomic_inc(&tuplehash_to_ctrack(h)->ct_general.use);
- read_unlock_bh(&ip_conntrack_lock);
-
- return h;
-}
-
-static void __ip_conntrack_hash_insert(struct ip_conntrack *ct,
- unsigned int hash,
- unsigned int repl_hash)
-{
- ct->id = ++ip_conntrack_next_id;
- list_add(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list,
- &ip_conntrack_hash[hash]);
- list_add(&ct->tuplehash[IP_CT_DIR_REPLY].list,
- &ip_conntrack_hash[repl_hash]);
-}
-
-void ip_conntrack_hash_insert(struct ip_conntrack *ct)
-{
- unsigned int hash, repl_hash;
-
- hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
- repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
-
- write_lock_bh(&ip_conntrack_lock);
- __ip_conntrack_hash_insert(ct, hash, repl_hash);
- write_unlock_bh(&ip_conntrack_lock);
-}
-
-/* Confirm a connection given skb; places it in hash table */
-int
-__ip_conntrack_confirm(struct sk_buff **pskb)
-{
- unsigned int hash, repl_hash;
- struct ip_conntrack_tuple_hash *h;
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
-
- ct = ip_conntrack_get(*pskb, &ctinfo);
-
- /* ipt_REJECT uses ip_conntrack_attach to attach related
- ICMP/TCP RST packets in other direction. Actual packet
- which created connection will be IP_CT_NEW or for an
- expected connection, IP_CT_RELATED. */
- if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL)
- return NF_ACCEPT;
-
- hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
- repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
-
- /* We're not in hash table, and we refuse to set up related
- connections for unconfirmed conns. But packet copies and
- REJECT will give spurious warnings here. */
- /* IP_NF_ASSERT(atomic_read(&ct->ct_general.use) == 1); */
-
- /* No external references means noone else could have
- confirmed us. */
- IP_NF_ASSERT(!is_confirmed(ct));
- DEBUGP("Confirming conntrack %p\n", ct);
-
- write_lock_bh(&ip_conntrack_lock);
-
- /* See if there's one in the list already, including reverse:
- NAT could have grabbed it without realizing, since we're
- not in the hash. If there is, we lost race. */
- list_for_each_entry(h, &ip_conntrack_hash[hash], list)
- if (ip_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
- &h->tuple))
- goto out;
- list_for_each_entry(h, &ip_conntrack_hash[repl_hash], list)
- if (ip_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple,
- &h->tuple))
- goto out;
-
- /* Remove from unconfirmed list */
- list_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
-
- __ip_conntrack_hash_insert(ct, hash, repl_hash);
- /* Timer relative to confirmation time, not original
- setting time, otherwise we'd get timer wrap in
- weird delay cases. */
- ct->timeout.expires += jiffies;
- add_timer(&ct->timeout);
- atomic_inc(&ct->ct_general.use);
- set_bit(IPS_CONFIRMED_BIT, &ct->status);
- CONNTRACK_STAT_INC(insert);
- write_unlock_bh(&ip_conntrack_lock);
- if (ct->helper)
- ip_conntrack_event_cache(IPCT_HELPER, *pskb);
-#ifdef CONFIG_IP_NF_NAT_NEEDED
- if (test_bit(IPS_SRC_NAT_DONE_BIT, &ct->status) ||
- test_bit(IPS_DST_NAT_DONE_BIT, &ct->status))
- ip_conntrack_event_cache(IPCT_NATINFO, *pskb);
-#endif
- ip_conntrack_event_cache(master_ct(ct) ?
- IPCT_RELATED : IPCT_NEW, *pskb);
-
- return NF_ACCEPT;
-
-out:
- CONNTRACK_STAT_INC(insert_failed);
- write_unlock_bh(&ip_conntrack_lock);
- return NF_DROP;
-}
-
-/* Returns true if a connection correspondings to the tuple (required
- for NAT). */
-int
-ip_conntrack_tuple_taken(const struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack *ignored_conntrack)
-{
- struct ip_conntrack_tuple_hash *h;
-
- read_lock_bh(&ip_conntrack_lock);
- h = __ip_conntrack_find(tuple, ignored_conntrack);
- read_unlock_bh(&ip_conntrack_lock);
-
- return h != NULL;
-}
-
-/* There's a small race here where we may free a just-assured
- connection. Too bad: we're in trouble anyway. */
-static int early_drop(struct list_head *chain)
-{
- /* Traverse backwards: gives us oldest, which is roughly LRU */
- struct ip_conntrack_tuple_hash *h;
- struct ip_conntrack *ct = NULL, *tmp;
- int dropped = 0;
-
- read_lock_bh(&ip_conntrack_lock);
- list_for_each_entry_reverse(h, chain, list) {
- tmp = tuplehash_to_ctrack(h);
- if (!test_bit(IPS_ASSURED_BIT, &tmp->status)) {
- ct = tmp;
- atomic_inc(&ct->ct_general.use);
- break;
- }
- }
- read_unlock_bh(&ip_conntrack_lock);
-
- if (!ct)
- return dropped;
-
- if (del_timer(&ct->timeout)) {
- death_by_timeout((unsigned long)ct);
- dropped = 1;
- CONNTRACK_STAT_INC_ATOMIC(early_drop);
- }
- ip_conntrack_put(ct);
- return dropped;
-}
-
-static struct ip_conntrack_helper *
-__ip_conntrack_helper_find( const struct ip_conntrack_tuple *tuple)
-{
- struct ip_conntrack_helper *h;
-
- list_for_each_entry(h, &helpers, list) {
- if (ip_ct_tuple_mask_cmp(tuple, &h->tuple, &h->mask))
- return h;
- }
- return NULL;
-}
-
-struct ip_conntrack_helper *
-ip_conntrack_helper_find_get( const struct ip_conntrack_tuple *tuple)
-{
- struct ip_conntrack_helper *helper;
-
- /* need ip_conntrack_lock to assure that helper exists until
- * try_module_get() is called */
- read_lock_bh(&ip_conntrack_lock);
-
- helper = __ip_conntrack_helper_find(tuple);
- if (helper) {
- /* need to increase module usage count to assure helper will
- * not go away while the caller is e.g. busy putting a
- * conntrack in the hash that uses the helper */
- if (!try_module_get(helper->me))
- helper = NULL;
- }
-
- read_unlock_bh(&ip_conntrack_lock);
-
- return helper;
-}
-
-void ip_conntrack_helper_put(struct ip_conntrack_helper *helper)
-{
- module_put(helper->me);
-}
-
-struct ip_conntrack_protocol *
-__ip_conntrack_proto_find(u_int8_t protocol)
-{
- return ip_ct_protos[protocol];
-}
-
-/* this is guaranteed to always return a valid protocol helper, since
- * it falls back to generic_protocol */
-struct ip_conntrack_protocol *
-ip_conntrack_proto_find_get(u_int8_t protocol)
-{
- struct ip_conntrack_protocol *p;
-
- rcu_read_lock();
- p = __ip_conntrack_proto_find(protocol);
- if (p) {
- if (!try_module_get(p->me))
- p = &ip_conntrack_generic_protocol;
- }
- rcu_read_unlock();
-
- return p;
-}
-
-void ip_conntrack_proto_put(struct ip_conntrack_protocol *p)
-{
- module_put(p->me);
-}
-
-struct ip_conntrack *ip_conntrack_alloc(struct ip_conntrack_tuple *orig,
- struct ip_conntrack_tuple *repl)
-{
- struct ip_conntrack *conntrack;
-
- if (!ip_conntrack_hash_rnd_initted) {
- get_random_bytes(&ip_conntrack_hash_rnd, 4);
- ip_conntrack_hash_rnd_initted = 1;
- }
-
- /* We don't want any race condition at early drop stage */
- atomic_inc(&ip_conntrack_count);
-
- if (ip_conntrack_max
- && atomic_read(&ip_conntrack_count) > ip_conntrack_max) {
- unsigned int hash = hash_conntrack(orig);
- /* Try dropping from this hash chain. */
- if (!early_drop(&ip_conntrack_hash[hash])) {
- atomic_dec(&ip_conntrack_count);
- if (net_ratelimit())
- printk(KERN_WARNING
- "ip_conntrack: table full, dropping"
- " packet.\n");
- return ERR_PTR(-ENOMEM);
- }
- }
-
- conntrack = kmem_cache_zalloc(ip_conntrack_cachep, GFP_ATOMIC);
- if (!conntrack) {
- DEBUGP("Can't allocate conntrack.\n");
- atomic_dec(&ip_conntrack_count);
- return ERR_PTR(-ENOMEM);
- }
-
- atomic_set(&conntrack->ct_general.use, 1);
- conntrack->ct_general.destroy = destroy_conntrack;
- conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig;
- conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *repl;
- /* Don't set timer yet: wait for confirmation */
- init_timer(&conntrack->timeout);
- conntrack->timeout.data = (unsigned long)conntrack;
- conntrack->timeout.function = death_by_timeout;
-
- return conntrack;
-}
-
-void
-ip_conntrack_free(struct ip_conntrack *conntrack)
-{
- atomic_dec(&ip_conntrack_count);
- kmem_cache_free(ip_conntrack_cachep, conntrack);
-}
-
-/* Allocate a new conntrack: we return -ENOMEM if classification
- * failed due to stress. Otherwise it really is unclassifiable */
-static struct ip_conntrack_tuple_hash *
-init_conntrack(struct ip_conntrack_tuple *tuple,
- struct ip_conntrack_protocol *protocol,
- struct sk_buff *skb)
-{
- struct ip_conntrack *conntrack;
- struct ip_conntrack_tuple repl_tuple;
- struct ip_conntrack_expect *exp;
-
- if (!ip_ct_invert_tuple(&repl_tuple, tuple, protocol)) {
- DEBUGP("Can't invert tuple.\n");
- return NULL;
- }
-
- conntrack = ip_conntrack_alloc(tuple, &repl_tuple);
- if (conntrack == NULL || IS_ERR(conntrack))
- return (struct ip_conntrack_tuple_hash *)conntrack;
-
- if (!protocol->new(conntrack, skb)) {
- ip_conntrack_free(conntrack);
- return NULL;
- }
-
- write_lock_bh(&ip_conntrack_lock);
- exp = find_expectation(tuple);
-
- if (exp) {
- DEBUGP("conntrack: expectation arrives ct=%p exp=%p\n",
- conntrack, exp);
- /* Welcome, Mr. Bond. We've been expecting you... */
- __set_bit(IPS_EXPECTED_BIT, &conntrack->status);
- conntrack->master = exp->master;
-#ifdef CONFIG_IP_NF_CONNTRACK_MARK
- conntrack->mark = exp->master->mark;
-#endif
-#if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \
- defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE)
- /* this is ugly, but there is no other place where to put it */
- conntrack->nat.masq_index = exp->master->nat.masq_index;
-#endif
-#ifdef CONFIG_IP_NF_CONNTRACK_SECMARK
- conntrack->secmark = exp->master->secmark;
-#endif
- nf_conntrack_get(&conntrack->master->ct_general);
- CONNTRACK_STAT_INC(expect_new);
- } else {
- conntrack->helper = __ip_conntrack_helper_find(&repl_tuple);
-
- CONNTRACK_STAT_INC(new);
- }
-
- /* Overload tuple linked list to put us in unconfirmed list. */
- list_add(&conntrack->tuplehash[IP_CT_DIR_ORIGINAL].list, &unconfirmed);
-
- write_unlock_bh(&ip_conntrack_lock);
-
- if (exp) {
- if (exp->expectfn)
- exp->expectfn(conntrack, exp);
- ip_conntrack_expect_put(exp);
- }
-
- return &conntrack->tuplehash[IP_CT_DIR_ORIGINAL];
-}
-
-/* On success, returns conntrack ptr, sets skb->nfct and ctinfo */
-static inline struct ip_conntrack *
-resolve_normal_ct(struct sk_buff *skb,
- struct ip_conntrack_protocol *proto,
- int *set_reply,
- unsigned int hooknum,
- enum ip_conntrack_info *ctinfo)
-{
- struct ip_conntrack_tuple tuple;
- struct ip_conntrack_tuple_hash *h;
- struct ip_conntrack *ct;
-
- IP_NF_ASSERT((ip_hdr(skb)->frag_off & htons(IP_OFFSET)) == 0);
-
- if (!ip_ct_get_tuple(ip_hdr(skb), skb, ip_hdrlen(skb), &tuple,proto))
- return NULL;
-
- /* look for tuple match */
- h = ip_conntrack_find_get(&tuple, NULL);
- if (!h) {
- h = init_conntrack(&tuple, proto, skb);
- if (!h)
- return NULL;
- if (IS_ERR(h))
- return (void *)h;
- }
- ct = tuplehash_to_ctrack(h);
-
- /* It exists; we have (non-exclusive) reference. */
- if (DIRECTION(h) == IP_CT_DIR_REPLY) {
- *ctinfo = IP_CT_ESTABLISHED + IP_CT_IS_REPLY;
- /* Please set reply bit if this packet OK */
- *set_reply = 1;
- } else {
- /* Once we've had two way comms, always ESTABLISHED. */
- if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
- DEBUGP("ip_conntrack_in: normal packet for %p\n",
- ct);
- *ctinfo = IP_CT_ESTABLISHED;
- } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) {
- DEBUGP("ip_conntrack_in: related packet for %p\n",
- ct);
- *ctinfo = IP_CT_RELATED;
- } else {
- DEBUGP("ip_conntrack_in: new packet for %p\n",
- ct);
- *ctinfo = IP_CT_NEW;
- }
- *set_reply = 0;
- }
- skb->nfct = &ct->ct_general;
- skb->nfctinfo = *ctinfo;
- return ct;
-}
-
-/* Netfilter hook itself. */
-unsigned int ip_conntrack_in(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
- struct ip_conntrack_protocol *proto;
- int set_reply = 0;
- int ret;
-
- /* Previously seen (loopback or untracked)? Ignore. */
- if ((*pskb)->nfct) {
- CONNTRACK_STAT_INC_ATOMIC(ignore);
- return NF_ACCEPT;
- }
-
- /* Never happen */
- if (ip_hdr(*pskb)->frag_off & htons(IP_OFFSET)) {
- if (net_ratelimit()) {
- printk(KERN_ERR "ip_conntrack_in: Frag of proto %u (hook=%u)\n",
- ip_hdr(*pskb)->protocol, hooknum);
- }
- return NF_DROP;
- }
-
-/* Doesn't cover locally-generated broadcast, so not worth it. */
-#if 0
- /* Ignore broadcast: no `connection'. */
- if ((*pskb)->pkt_type == PACKET_BROADCAST) {
- printk("Broadcast packet!\n");
- return NF_ACCEPT;
- } else if ((ip_hdr(*pskb)->daddr & htonl(0x000000FF))
- == htonl(0x000000FF)) {
- printk("Should bcast: %u.%u.%u.%u->%u.%u.%u.%u (sk=%p, ptype=%u)\n",
- NIPQUAD(ip_hdr(*pskb)->saddr),
- NIPQUAD(ip_hdr(*pskb)->daddr),
- (*pskb)->sk, (*pskb)->pkt_type);
- }
-#endif
-
- /* rcu_read_lock()ed by nf_hook_slow */
- proto = __ip_conntrack_proto_find(ip_hdr(*pskb)->protocol);
-
- /* It may be an special packet, error, unclean...
- * inverse of the return code tells to the netfilter
- * core what to do with the packet. */
- if (proto->error != NULL
- && (ret = proto->error(*pskb, &ctinfo, hooknum)) <= 0) {
- CONNTRACK_STAT_INC_ATOMIC(error);
- CONNTRACK_STAT_INC_ATOMIC(invalid);
- return -ret;
- }
-
- if (!(ct = resolve_normal_ct(*pskb, proto,&set_reply,hooknum,&ctinfo))) {
- /* Not valid part of a connection */
- CONNTRACK_STAT_INC_ATOMIC(invalid);
- return NF_ACCEPT;
- }
-
- if (IS_ERR(ct)) {
- /* Too stressed to deal. */
- CONNTRACK_STAT_INC_ATOMIC(drop);
- return NF_DROP;
- }
-
- IP_NF_ASSERT((*pskb)->nfct);
-
- ret = proto->packet(ct, *pskb, ctinfo);
- if (ret < 0) {
- /* Invalid: inverse of the return code tells
- * the netfilter core what to do*/
- nf_conntrack_put((*pskb)->nfct);
- (*pskb)->nfct = NULL;
- CONNTRACK_STAT_INC_ATOMIC(invalid);
- return -ret;
- }
-
- if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status))
- ip_conntrack_event_cache(IPCT_STATUS, *pskb);
-
- return ret;
-}
-
-int invert_tuplepr(struct ip_conntrack_tuple *inverse,
- const struct ip_conntrack_tuple *orig)
-{
- struct ip_conntrack_protocol *proto;
- int ret;
-
- rcu_read_lock();
- proto = __ip_conntrack_proto_find(orig->dst.protonum);
- ret = ip_ct_invert_tuple(inverse, orig, proto);
- rcu_read_unlock();
-
- return ret;
-}
-
-/* Would two expected things clash? */
-static inline int expect_clash(const struct ip_conntrack_expect *a,
- const struct ip_conntrack_expect *b)
-{
- /* Part covered by intersection of masks must be unequal,
- otherwise they clash */
- struct ip_conntrack_tuple intersect_mask
- = { { a->mask.src.ip & b->mask.src.ip,
- { a->mask.src.u.all & b->mask.src.u.all } },
- { a->mask.dst.ip & b->mask.dst.ip,
- { a->mask.dst.u.all & b->mask.dst.u.all },
- a->mask.dst.protonum & b->mask.dst.protonum } };
-
- return ip_ct_tuple_mask_cmp(&a->tuple, &b->tuple, &intersect_mask);
-}
-
-static inline int expect_matches(const struct ip_conntrack_expect *a,
- const struct ip_conntrack_expect *b)
-{
- return a->master == b->master
- && ip_ct_tuple_equal(&a->tuple, &b->tuple)
- && ip_ct_tuple_equal(&a->mask, &b->mask);
-}
-
-/* Generally a bad idea to call this: could have matched already. */
-void ip_conntrack_unexpect_related(struct ip_conntrack_expect *exp)
-{
- struct ip_conntrack_expect *i;
-
- write_lock_bh(&ip_conntrack_lock);
- /* choose the the oldest expectation to evict */
- list_for_each_entry_reverse(i, &ip_conntrack_expect_list, list) {
- if (expect_matches(i, exp) && del_timer(&i->timeout)) {
- ip_ct_unlink_expect(i);
- write_unlock_bh(&ip_conntrack_lock);
- ip_conntrack_expect_put(i);
- return;
- }
- }
- write_unlock_bh(&ip_conntrack_lock);
-}
-
-/* We don't increase the master conntrack refcount for non-fulfilled
- * conntracks. During the conntrack destruction, the expectations are
- * always killed before the conntrack itself */
-struct ip_conntrack_expect *ip_conntrack_expect_alloc(struct ip_conntrack *me)
-{
- struct ip_conntrack_expect *new;
-
- new = kmem_cache_alloc(ip_conntrack_expect_cachep, GFP_ATOMIC);
- if (!new) {
- DEBUGP("expect_related: OOM allocating expect\n");
- return NULL;
- }
- new->master = me;
- atomic_set(&new->use, 1);
- return new;
-}
-
-void ip_conntrack_expect_put(struct ip_conntrack_expect *exp)
-{
- if (atomic_dec_and_test(&exp->use))
- kmem_cache_free(ip_conntrack_expect_cachep, exp);
-}
-
-static void ip_conntrack_expect_insert(struct ip_conntrack_expect *exp)
-{
- atomic_inc(&exp->use);
- exp->master->expecting++;
- list_add(&exp->list, &ip_conntrack_expect_list);
-
- init_timer(&exp->timeout);
- exp->timeout.data = (unsigned long)exp;
- exp->timeout.function = expectation_timed_out;
- exp->timeout.expires = jiffies + exp->master->helper->timeout * HZ;
- add_timer(&exp->timeout);
-
- exp->id = ++ip_conntrack_expect_next_id;
- atomic_inc(&exp->use);
- CONNTRACK_STAT_INC(expect_create);
-}
-
-/* Race with expectations being used means we could have none to find; OK. */
-static void evict_oldest_expect(struct ip_conntrack *master)
-{
- struct ip_conntrack_expect *i;
-
- list_for_each_entry_reverse(i, &ip_conntrack_expect_list, list) {
- if (i->master == master) {
- if (del_timer(&i->timeout)) {
- ip_ct_unlink_expect(i);
- ip_conntrack_expect_put(i);
- }
- break;
- }
- }
-}
-
-static inline int refresh_timer(struct ip_conntrack_expect *i)
-{
- if (!del_timer(&i->timeout))
- return 0;
-
- i->timeout.expires = jiffies + i->master->helper->timeout*HZ;
- add_timer(&i->timeout);
- return 1;
-}
-
-int ip_conntrack_expect_related(struct ip_conntrack_expect *expect)
-{
- struct ip_conntrack_expect *i;
- int ret;
-
- DEBUGP("ip_conntrack_expect_related %p\n", related_to);
- DEBUGP("tuple: "); DUMP_TUPLE(&expect->tuple);
- DEBUGP("mask: "); DUMP_TUPLE(&expect->mask);
-
- write_lock_bh(&ip_conntrack_lock);
- list_for_each_entry(i, &ip_conntrack_expect_list, list) {
- if (expect_matches(i, expect)) {
- /* Refresh timer: if it's dying, ignore.. */
- if (refresh_timer(i)) {
- ret = 0;
- goto out;
- }
- } else if (expect_clash(i, expect)) {
- ret = -EBUSY;
- goto out;
- }
- }
-
- /* Will be over limit? */
- if (expect->master->helper->max_expected &&
- expect->master->expecting >= expect->master->helper->max_expected)
- evict_oldest_expect(expect->master);
-
- ip_conntrack_expect_insert(expect);
- ip_conntrack_expect_event(IPEXP_NEW, expect);
- ret = 0;
-out:
- write_unlock_bh(&ip_conntrack_lock);
- return ret;
-}
-
-/* Alter reply tuple (maybe alter helper). This is for NAT, and is
- implicitly racy: see __ip_conntrack_confirm */
-void ip_conntrack_alter_reply(struct ip_conntrack *conntrack,
- const struct ip_conntrack_tuple *newreply)
-{
- write_lock_bh(&ip_conntrack_lock);
- /* Should be unconfirmed, so not in hash table yet */
- IP_NF_ASSERT(!is_confirmed(conntrack));
-
- DEBUGP("Altering reply tuple of %p to ", conntrack);
- DUMP_TUPLE(newreply);
-
- conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply;
- if (!conntrack->master && conntrack->expecting == 0)
- conntrack->helper = __ip_conntrack_helper_find(newreply);
- write_unlock_bh(&ip_conntrack_lock);
-}
-
-int ip_conntrack_helper_register(struct ip_conntrack_helper *me)
-{
- BUG_ON(me->timeout == 0);
- write_lock_bh(&ip_conntrack_lock);
- list_add(&me->list, &helpers);
- write_unlock_bh(&ip_conntrack_lock);
-
- return 0;
-}
-
-struct ip_conntrack_helper *
-__ip_conntrack_helper_find_byname(const char *name)
-{
- struct ip_conntrack_helper *h;
-
- list_for_each_entry(h, &helpers, list) {
- if (!strcmp(h->name, name))
- return h;
- }
-
- return NULL;
-}
-
-static inline void unhelp(struct ip_conntrack_tuple_hash *i,
- const struct ip_conntrack_helper *me)
-{
- if (tuplehash_to_ctrack(i)->helper == me) {
- ip_conntrack_event(IPCT_HELPER, tuplehash_to_ctrack(i));
- tuplehash_to_ctrack(i)->helper = NULL;
- }
-}
-
-void ip_conntrack_helper_unregister(struct ip_conntrack_helper *me)
-{
- unsigned int i;
- struct ip_conntrack_tuple_hash *h;
- struct ip_conntrack_expect *exp, *tmp;
-
- /* Need write lock here, to delete helper. */
- write_lock_bh(&ip_conntrack_lock);
- list_del(&me->list);
-
- /* Get rid of expectations */
- list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list, list) {
- if (exp->master->helper == me && del_timer(&exp->timeout)) {
- ip_ct_unlink_expect(exp);
- ip_conntrack_expect_put(exp);
- }
- }
- /* Get rid of expecteds, set helpers to NULL. */
- list_for_each_entry(h, &unconfirmed, list)
- unhelp(h, me);
- for (i = 0; i < ip_conntrack_htable_size; i++) {
- list_for_each_entry(h, &ip_conntrack_hash[i], list)
- unhelp(h, me);
- }
- write_unlock_bh(&ip_conntrack_lock);
-
- /* Someone could be still looking at the helper in a bh. */
- synchronize_net();
-}
-
-/* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */
-void __ip_ct_refresh_acct(struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- const struct sk_buff *skb,
- unsigned long extra_jiffies,
- int do_acct)
-{
- int event = 0;
-
- IP_NF_ASSERT(ct->timeout.data == (unsigned long)ct);
- IP_NF_ASSERT(skb);
-
- write_lock_bh(&ip_conntrack_lock);
-
- /* Only update if this is not a fixed timeout */
- if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) {
- write_unlock_bh(&ip_conntrack_lock);
- return;
- }
-
- /* If not in hash table, timer will not be active yet */
- if (!is_confirmed(ct)) {
- ct->timeout.expires = extra_jiffies;
- event = IPCT_REFRESH;
- } else {
- /* Need del_timer for race avoidance (may already be dying). */
- if (del_timer(&ct->timeout)) {
- ct->timeout.expires = jiffies + extra_jiffies;
- add_timer(&ct->timeout);
- event = IPCT_REFRESH;
- }
- }
-
-#ifdef CONFIG_IP_NF_CT_ACCT
- if (do_acct) {
- ct->counters[CTINFO2DIR(ctinfo)].packets++;
- ct->counters[CTINFO2DIR(ctinfo)].bytes +=
- ntohs(ip_hdr(skb)->tot_len);
- if ((ct->counters[CTINFO2DIR(ctinfo)].packets & 0x80000000)
- || (ct->counters[CTINFO2DIR(ctinfo)].bytes & 0x80000000))
- event |= IPCT_COUNTER_FILLING;
- }
-#endif
-
- write_unlock_bh(&ip_conntrack_lock);
-
- /* must be unlocked when calling event cache */
- if (event)
- ip_conntrack_event_cache(event, skb);
-}
-
-#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
- defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
-/* Generic function for tcp/udp/sctp/dccp and alike. This needs to be
- * in ip_conntrack_core, since we don't want the protocols to autoload
- * or depend on ctnetlink */
-int ip_ct_port_tuple_to_nfattr(struct sk_buff *skb,
- const struct ip_conntrack_tuple *tuple)
-{
- NFA_PUT(skb, CTA_PROTO_SRC_PORT, sizeof(__be16),
- &tuple->src.u.tcp.port);
- NFA_PUT(skb, CTA_PROTO_DST_PORT, sizeof(__be16),
- &tuple->dst.u.tcp.port);
- return 0;
-
-nfattr_failure:
- return -1;
-}
-
-int ip_ct_port_nfattr_to_tuple(struct nfattr *tb[],
- struct ip_conntrack_tuple *t)
-{
- if (!tb[CTA_PROTO_SRC_PORT-1] || !tb[CTA_PROTO_DST_PORT-1])
- return -EINVAL;
-
- t->src.u.tcp.port =
- *(__be16 *)NFA_DATA(tb[CTA_PROTO_SRC_PORT-1]);
- t->dst.u.tcp.port =
- *(__be16 *)NFA_DATA(tb[CTA_PROTO_DST_PORT-1]);
-
- return 0;
-}
-#endif
-
-/* Returns new sk_buff, or NULL */
-struct sk_buff *
-ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user)
-{
- skb_orphan(skb);
-
- local_bh_disable();
- skb = ip_defrag(skb, user);
- local_bh_enable();
-
- if (skb)
- ip_send_check(ip_hdr(skb));
- return skb;
-}
-
-/* Used by ipt_REJECT. */
-static void ip_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb)
-{
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
-
- /* This ICMP is in reverse direction to the packet which caused it */
- ct = ip_conntrack_get(skb, &ctinfo);
-
- if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL)
- ctinfo = IP_CT_RELATED + IP_CT_IS_REPLY;
- else
- ctinfo = IP_CT_RELATED;
-
- /* Attach to new skbuff, and increment count */
- nskb->nfct = &ct->ct_general;
- nskb->nfctinfo = ctinfo;
- nf_conntrack_get(nskb->nfct);
-}
-
-/* Bring out ya dead! */
-static struct ip_conntrack *
-get_next_corpse(int (*iter)(struct ip_conntrack *i, void *data),
- void *data, unsigned int *bucket)
-{
- struct ip_conntrack_tuple_hash *h;
- struct ip_conntrack *ct;
-
- write_lock_bh(&ip_conntrack_lock);
- for (; *bucket < ip_conntrack_htable_size; (*bucket)++) {
- list_for_each_entry(h, &ip_conntrack_hash[*bucket], list) {
- ct = tuplehash_to_ctrack(h);
- if (iter(ct, data))
- goto found;
- }
- }
- list_for_each_entry(h, &unconfirmed, list) {
- ct = tuplehash_to_ctrack(h);
- if (iter(ct, data))
- set_bit(IPS_DYING_BIT, &ct->status);
- }
- write_unlock_bh(&ip_conntrack_lock);
- return NULL;
-
-found:
- atomic_inc(&ct->ct_general.use);
- write_unlock_bh(&ip_conntrack_lock);
- return ct;
-}
-
-void
-ip_ct_iterate_cleanup(int (*iter)(struct ip_conntrack *i, void *), void *data)
-{
- struct ip_conntrack *ct;
- unsigned int bucket = 0;
-
- while ((ct = get_next_corpse(iter, data, &bucket)) != NULL) {
- /* Time to push up daises... */
- if (del_timer(&ct->timeout))
- death_by_timeout((unsigned long)ct);
- /* ... else the timer will get him soon. */
-
- ip_conntrack_put(ct);
- }
-}
-
-/* Fast function for those who don't want to parse /proc (and I don't
- blame them). */
-/* Reversing the socket's dst/src point of view gives us the reply
- mapping. */
-static int
-getorigdst(struct sock *sk, int optval, void __user *user, int *len)
-{
- struct inet_sock *inet = inet_sk(sk);
- struct ip_conntrack_tuple_hash *h;
- struct ip_conntrack_tuple tuple;
-
- IP_CT_TUPLE_U_BLANK(&tuple);
- tuple.src.ip = inet->rcv_saddr;
- tuple.src.u.tcp.port = inet->sport;
- tuple.dst.ip = inet->daddr;
- tuple.dst.u.tcp.port = inet->dport;
- tuple.dst.protonum = IPPROTO_TCP;
-
- /* We only do TCP at the moment: is there a better way? */
- if (strcmp(sk->sk_prot->name, "TCP")) {
- DEBUGP("SO_ORIGINAL_DST: Not a TCP socket\n");
- return -ENOPROTOOPT;
- }
-
- if ((unsigned int) *len < sizeof(struct sockaddr_in)) {
- DEBUGP("SO_ORIGINAL_DST: len %u not %u\n",
- *len, sizeof(struct sockaddr_in));
- return -EINVAL;
- }
-
- h = ip_conntrack_find_get(&tuple, NULL);
- if (h) {
- struct sockaddr_in sin;
- struct ip_conntrack *ct = tuplehash_to_ctrack(h);
-
- sin.sin_family = AF_INET;
- sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL]
- .tuple.dst.u.tcp.port;
- sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL]
- .tuple.dst.ip;
- memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
-
- DEBUGP("SO_ORIGINAL_DST: %u.%u.%u.%u %u\n",
- NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port));
- ip_conntrack_put(ct);
- if (copy_to_user(user, &sin, sizeof(sin)) != 0)
- return -EFAULT;
- else
- return 0;
- }
- DEBUGP("SO_ORIGINAL_DST: Can't find %u.%u.%u.%u/%u-%u.%u.%u.%u/%u.\n",
- NIPQUAD(tuple.src.ip), ntohs(tuple.src.u.tcp.port),
- NIPQUAD(tuple.dst.ip), ntohs(tuple.dst.u.tcp.port));
- return -ENOENT;
-}
-
-static struct nf_sockopt_ops so_getorigdst = {
- .pf = PF_INET,
- .get_optmin = SO_ORIGINAL_DST,
- .get_optmax = SO_ORIGINAL_DST+1,
- .get = &getorigdst,
-};
-
-static int kill_all(struct ip_conntrack *i, void *data)
-{
- return 1;
-}
-
-void ip_conntrack_flush(void)
-{
- ip_ct_iterate_cleanup(kill_all, NULL);
-}
-
-static void free_conntrack_hash(struct list_head *hash, int vmalloced,int size)
-{
- if (vmalloced)
- vfree(hash);
- else
- free_pages((unsigned long)hash,
- get_order(sizeof(struct list_head) * size));
-}
-
-/* Mishearing the voices in his head, our hero wonders how he's
- supposed to kill the mall. */
-void ip_conntrack_cleanup(void)
-{
- rcu_assign_pointer(ip_ct_attach, NULL);
-
- /* This makes sure all current packets have passed through
- netfilter framework. Roll on, two-stage module
- delete... */
- synchronize_net();
-
- ip_ct_event_cache_flush();
- i_see_dead_people:
- ip_conntrack_flush();
- if (atomic_read(&ip_conntrack_count) != 0) {
- schedule();
- goto i_see_dead_people;
- }
- /* wait until all references to ip_conntrack_untracked are dropped */
- while (atomic_read(&ip_conntrack_untracked.ct_general.use) > 1)
- schedule();
-
- kmem_cache_destroy(ip_conntrack_cachep);
- kmem_cache_destroy(ip_conntrack_expect_cachep);
- free_conntrack_hash(ip_conntrack_hash, ip_conntrack_vmalloc,
- ip_conntrack_htable_size);
- nf_unregister_sockopt(&so_getorigdst);
-}
-
-static struct list_head *alloc_hashtable(int size, int *vmalloced)
-{
- struct list_head *hash;
- unsigned int i;
-
- *vmalloced = 0;
- hash = (void*)__get_free_pages(GFP_KERNEL,
- get_order(sizeof(struct list_head)
- * size));
- if (!hash) {
- *vmalloced = 1;
- printk(KERN_WARNING"ip_conntrack: falling back to vmalloc.\n");
- hash = vmalloc(sizeof(struct list_head) * size);
- }
-
- if (hash)
- for (i = 0; i < size; i++)
- INIT_LIST_HEAD(&hash[i]);
-
- return hash;
-}
-
-static int set_hashsize(const char *val, struct kernel_param *kp)
-{
- int i, bucket, hashsize, vmalloced;
- int old_vmalloced, old_size;
- int rnd;
- struct list_head *hash, *old_hash;
- struct ip_conntrack_tuple_hash *h;
-
- /* On boot, we can set this without any fancy locking. */
- if (!ip_conntrack_htable_size)
- return param_set_int(val, kp);
-
- hashsize = simple_strtol(val, NULL, 0);
- if (!hashsize)
- return -EINVAL;
-
- hash = alloc_hashtable(hashsize, &vmalloced);
- if (!hash)
- return -ENOMEM;
-
- /* We have to rehash for the new table anyway, so we also can
- * use a new random seed */
- get_random_bytes(&rnd, 4);
-
- write_lock_bh(&ip_conntrack_lock);
- for (i = 0; i < ip_conntrack_htable_size; i++) {
- while (!list_empty(&ip_conntrack_hash[i])) {
- h = list_entry(ip_conntrack_hash[i].next,
- struct ip_conntrack_tuple_hash, list);
- list_del(&h->list);
- bucket = __hash_conntrack(&h->tuple, hashsize, rnd);
- list_add_tail(&h->list, &hash[bucket]);
- }
- }
- old_size = ip_conntrack_htable_size;
- old_vmalloced = ip_conntrack_vmalloc;
- old_hash = ip_conntrack_hash;
-
- ip_conntrack_htable_size = hashsize;
- ip_conntrack_vmalloc = vmalloced;
- ip_conntrack_hash = hash;
- ip_conntrack_hash_rnd = rnd;
- write_unlock_bh(&ip_conntrack_lock);
-
- free_conntrack_hash(old_hash, old_vmalloced, old_size);
- return 0;
-}
-
-module_param_call(hashsize, set_hashsize, param_get_uint,
- &ip_conntrack_htable_size, 0600);
-
-int __init ip_conntrack_init(void)
-{
- unsigned int i;
- int ret;
-
- /* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB
- * machine has 256 buckets. >= 1GB machines have 8192 buckets. */
- if (!ip_conntrack_htable_size) {
- ip_conntrack_htable_size
- = (((num_physpages << PAGE_SHIFT) / 16384)
- / sizeof(struct list_head));
- if (num_physpages > (1024 * 1024 * 1024 / PAGE_SIZE))
- ip_conntrack_htable_size = 8192;
- if (ip_conntrack_htable_size < 16)
- ip_conntrack_htable_size = 16;
- }
- ip_conntrack_max = 8 * ip_conntrack_htable_size;
-
- printk("ip_conntrack version %s (%u buckets, %d max)"
- " - %Zd bytes per conntrack\n", IP_CONNTRACK_VERSION,
- ip_conntrack_htable_size, ip_conntrack_max,
- sizeof(struct ip_conntrack));
-
- ret = nf_register_sockopt(&so_getorigdst);
- if (ret != 0) {
- printk(KERN_ERR "Unable to register netfilter socket option\n");
- return ret;
- }
-
- ip_conntrack_hash = alloc_hashtable(ip_conntrack_htable_size,
- &ip_conntrack_vmalloc);
- if (!ip_conntrack_hash) {
- printk(KERN_ERR "Unable to create ip_conntrack_hash\n");
- goto err_unreg_sockopt;
- }
-
- ip_conntrack_cachep = kmem_cache_create("ip_conntrack",
- sizeof(struct ip_conntrack), 0,
- 0, NULL, NULL);
- if (!ip_conntrack_cachep) {
- printk(KERN_ERR "Unable to create ip_conntrack slab cache\n");
- goto err_free_hash;
- }
-
- ip_conntrack_expect_cachep = kmem_cache_create("ip_conntrack_expect",
- sizeof(struct ip_conntrack_expect),
- 0, 0, NULL, NULL);
- if (!ip_conntrack_expect_cachep) {
- printk(KERN_ERR "Unable to create ip_expect slab cache\n");
- goto err_free_conntrack_slab;
- }
-
- /* Don't NEED lock here, but good form anyway. */
- write_lock_bh(&ip_conntrack_lock);
- for (i = 0; i < MAX_IP_CT_PROTO; i++)
- rcu_assign_pointer(ip_ct_protos[i], &ip_conntrack_generic_protocol);
- /* Sew in builtin protocols. */
- rcu_assign_pointer(ip_ct_protos[IPPROTO_TCP], &ip_conntrack_protocol_tcp);
- rcu_assign_pointer(ip_ct_protos[IPPROTO_UDP], &ip_conntrack_protocol_udp);
- rcu_assign_pointer(ip_ct_protos[IPPROTO_ICMP], &ip_conntrack_protocol_icmp);
- write_unlock_bh(&ip_conntrack_lock);
-
- /* For use by ipt_REJECT */
- rcu_assign_pointer(ip_ct_attach, ip_conntrack_attach);
-
- /* Set up fake conntrack:
- - to never be deleted, not in any hashes */
- atomic_set(&ip_conntrack_untracked.ct_general.use, 1);
- /* - and look it like as a confirmed connection */
- set_bit(IPS_CONFIRMED_BIT, &ip_conntrack_untracked.status);
-
- return ret;
-
-err_free_conntrack_slab:
- kmem_cache_destroy(ip_conntrack_cachep);
-err_free_hash:
- free_conntrack_hash(ip_conntrack_hash, ip_conntrack_vmalloc,
- ip_conntrack_htable_size);
-err_unreg_sockopt:
- nf_unregister_sockopt(&so_getorigdst);
-
- return -ENOMEM;
-}
+++ /dev/null
-/* FTP extension for IP connection tracking. */
-
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/module.h>
-#include <linux/netfilter.h>
-#include <linux/ip.h>
-#include <linux/ctype.h>
-#include <net/checksum.h>
-#include <net/tcp.h>
-
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_ftp.h>
-#include <linux/moduleparam.h>
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");
-MODULE_DESCRIPTION("ftp connection tracking helper");
-
-/* This is slow, but it's simple. --RR */
-static char *ftp_buffer;
-static DEFINE_SPINLOCK(ip_ftp_lock);
-
-#define MAX_PORTS 8
-static unsigned short ports[MAX_PORTS];
-static int ports_c;
-module_param_array(ports, ushort, &ports_c, 0400);
-
-static int loose;
-module_param(loose, bool, 0600);
-
-unsigned int (*ip_nat_ftp_hook)(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- enum ip_ct_ftp_type type,
- unsigned int matchoff,
- unsigned int matchlen,
- struct ip_conntrack_expect *exp,
- u32 *seq);
-EXPORT_SYMBOL_GPL(ip_nat_ftp_hook);
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-static int try_rfc959(const char *, size_t, u_int32_t [], char);
-static int try_eprt(const char *, size_t, u_int32_t [], char);
-static int try_epsv_response(const char *, size_t, u_int32_t [], char);
-
-static const struct ftp_search {
- const char *pattern;
- size_t plen;
- char skip;
- char term;
- enum ip_ct_ftp_type ftptype;
- int (*getnum)(const char *, size_t, u_int32_t[], char);
-} search[IP_CT_DIR_MAX][2] = {
- [IP_CT_DIR_ORIGINAL] = {
- {
- .pattern = "PORT",
- .plen = sizeof("PORT") - 1,
- .skip = ' ',
- .term = '\r',
- .ftptype = IP_CT_FTP_PORT,
- .getnum = try_rfc959,
- },
- {
- .pattern = "EPRT",
- .plen = sizeof("EPRT") - 1,
- .skip = ' ',
- .term = '\r',
- .ftptype = IP_CT_FTP_EPRT,
- .getnum = try_eprt,
- },
- },
- [IP_CT_DIR_REPLY] = {
- {
- .pattern = "227 ",
- .plen = sizeof("227 ") - 1,
- .skip = '(',
- .term = ')',
- .ftptype = IP_CT_FTP_PASV,
- .getnum = try_rfc959,
- },
- {
- .pattern = "229 ",
- .plen = sizeof("229 ") - 1,
- .skip = '(',
- .term = ')',
- .ftptype = IP_CT_FTP_EPSV,
- .getnum = try_epsv_response,
- },
- },
-};
-
-static int try_number(const char *data, size_t dlen, u_int32_t array[],
- int array_size, char sep, char term)
-{
- u_int32_t i, len;
-
- memset(array, 0, sizeof(array[0])*array_size);
-
- /* Keep data pointing at next char. */
- for (i = 0, len = 0; len < dlen && i < array_size; len++, data++) {
- if (*data >= '0' && *data <= '9') {
- array[i] = array[i]*10 + *data - '0';
- }
- else if (*data == sep)
- i++;
- else {
- /* Unexpected character; true if it's the
- terminator and we're finished. */
- if (*data == term && i == array_size - 1)
- return len;
-
- DEBUGP("Char %u (got %u nums) `%u' unexpected\n",
- len, i, *data);
- return 0;
- }
- }
- DEBUGP("Failed to fill %u numbers separated by %c\n", array_size, sep);
-
- return 0;
-}
-
-/* Returns 0, or length of numbers: 192,168,1,1,5,6 */
-static int try_rfc959(const char *data, size_t dlen, u_int32_t array[6],
- char term)
-{
- return try_number(data, dlen, array, 6, ',', term);
-}
-
-/* Grab port: number up to delimiter */
-static int get_port(const char *data, int start, size_t dlen, char delim,
- u_int32_t array[2])
-{
- u_int16_t port = 0;
- int i;
-
- for (i = start; i < dlen; i++) {
- /* Finished? */
- if (data[i] == delim) {
- if (port == 0)
- break;
- array[0] = port >> 8;
- array[1] = port;
- return i + 1;
- }
- else if (data[i] >= '0' && data[i] <= '9')
- port = port*10 + data[i] - '0';
- else /* Some other crap */
- break;
- }
- return 0;
-}
-
-/* Returns 0, or length of numbers: |1|132.235.1.2|6275| */
-static int try_eprt(const char *data, size_t dlen, u_int32_t array[6],
- char term)
-{
- char delim;
- int length;
-
- /* First character is delimiter, then "1" for IPv4, then
- delimiter again. */
- if (dlen <= 3) return 0;
- delim = data[0];
- if (isdigit(delim) || delim < 33 || delim > 126
- || data[1] != '1' || data[2] != delim)
- return 0;
-
- DEBUGP("EPRT: Got |1|!\n");
- /* Now we have IP address. */
- length = try_number(data + 3, dlen - 3, array, 4, '.', delim);
- if (length == 0)
- return 0;
-
- DEBUGP("EPRT: Got IP address!\n");
- /* Start offset includes initial "|1|", and trailing delimiter */
- return get_port(data, 3 + length + 1, dlen, delim, array+4);
-}
-
-/* Returns 0, or length of numbers: |||6446| */
-static int try_epsv_response(const char *data, size_t dlen, u_int32_t array[6],
- char term)
-{
- char delim;
-
- /* Three delimiters. */
- if (dlen <= 3) return 0;
- delim = data[0];
- if (isdigit(delim) || delim < 33 || delim > 126
- || data[1] != delim || data[2] != delim)
- return 0;
-
- return get_port(data, 3, dlen, delim, array+4);
-}
-
-/* Return 1 for match, 0 for accept, -1 for partial. */
-static int find_pattern(const char *data, size_t dlen,
- const char *pattern, size_t plen,
- char skip, char term,
- unsigned int *numoff,
- unsigned int *numlen,
- u_int32_t array[6],
- int (*getnum)(const char *, size_t, u_int32_t[], char))
-{
- size_t i;
-
- DEBUGP("find_pattern `%s': dlen = %u\n", pattern, dlen);
- if (dlen == 0)
- return 0;
-
- if (dlen <= plen) {
- /* Short packet: try for partial? */
- if (strnicmp(data, pattern, dlen) == 0)
- return -1;
- else return 0;
- }
-
- if (strnicmp(data, pattern, plen) != 0) {
-#if 0
- size_t i;
-
- DEBUGP("ftp: string mismatch\n");
- for (i = 0; i < plen; i++) {
- DEBUGP("ftp:char %u `%c'(%u) vs `%c'(%u)\n",
- i, data[i], data[i],
- pattern[i], pattern[i]);
- }
-#endif
- return 0;
- }
-
- DEBUGP("Pattern matches!\n");
- /* Now we've found the constant string, try to skip
- to the 'skip' character */
- for (i = plen; data[i] != skip; i++)
- if (i == dlen - 1) return -1;
-
- /* Skip over the last character */
- i++;
-
- DEBUGP("Skipped up to `%c'!\n", skip);
-
- *numoff = i;
- *numlen = getnum(data + i, dlen - i, array, term);
- if (!*numlen)
- return -1;
-
- DEBUGP("Match succeeded!\n");
- return 1;
-}
-
-/* Look up to see if we're just after a \n. */
-static int find_nl_seq(u32 seq, const struct ip_ct_ftp_master *info, int dir)
-{
- unsigned int i;
-
- for (i = 0; i < info->seq_aft_nl_num[dir]; i++)
- if (info->seq_aft_nl[dir][i] == seq)
- return 1;
- return 0;
-}
-
-/* We don't update if it's older than what we have. */
-static void update_nl_seq(u32 nl_seq, struct ip_ct_ftp_master *info, int dir,
- struct sk_buff *skb)
-{
- unsigned int i, oldest = NUM_SEQ_TO_REMEMBER;
-
- /* Look for oldest: if we find exact match, we're done. */
- for (i = 0; i < info->seq_aft_nl_num[dir]; i++) {
- if (info->seq_aft_nl[dir][i] == nl_seq)
- return;
-
- if (oldest == info->seq_aft_nl_num[dir]
- || before(info->seq_aft_nl[dir][i], oldest))
- oldest = i;
- }
-
- if (info->seq_aft_nl_num[dir] < NUM_SEQ_TO_REMEMBER) {
- info->seq_aft_nl[dir][info->seq_aft_nl_num[dir]++] = nl_seq;
- ip_conntrack_event_cache(IPCT_HELPINFO_VOLATILE, skb);
- } else if (oldest != NUM_SEQ_TO_REMEMBER) {
- info->seq_aft_nl[dir][oldest] = nl_seq;
- ip_conntrack_event_cache(IPCT_HELPINFO_VOLATILE, skb);
- }
-}
-
-static int help(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo)
-{
- unsigned int dataoff, datalen;
- struct tcphdr _tcph, *th;
- char *fb_ptr;
- int ret;
- u32 seq, array[6] = { 0 };
- int dir = CTINFO2DIR(ctinfo);
- unsigned int matchlen, matchoff;
- struct ip_ct_ftp_master *ct_ftp_info = &ct->help.ct_ftp_info;
- struct ip_conntrack_expect *exp;
- unsigned int i;
- int found = 0, ends_in_nl;
- typeof(ip_nat_ftp_hook) ip_nat_ftp;
-
- /* Until there's been traffic both ways, don't look in packets. */
- if (ctinfo != IP_CT_ESTABLISHED
- && ctinfo != IP_CT_ESTABLISHED+IP_CT_IS_REPLY) {
- DEBUGP("ftp: Conntrackinfo = %u\n", ctinfo);
- return NF_ACCEPT;
- }
-
- th = skb_header_pointer(*pskb, ip_hdrlen(*pskb),
- sizeof(_tcph), &_tcph);
- if (th == NULL)
- return NF_ACCEPT;
-
- dataoff = ip_hdrlen(*pskb) + th->doff * 4;
- /* No data? */
- if (dataoff >= (*pskb)->len) {
- DEBUGP("ftp: pskblen = %u\n", (*pskb)->len);
- return NF_ACCEPT;
- }
- datalen = (*pskb)->len - dataoff;
-
- spin_lock_bh(&ip_ftp_lock);
- fb_ptr = skb_header_pointer(*pskb, dataoff,
- (*pskb)->len - dataoff, ftp_buffer);
- BUG_ON(fb_ptr == NULL);
-
- ends_in_nl = (fb_ptr[datalen - 1] == '\n');
- seq = ntohl(th->seq) + datalen;
-
- /* Look up to see if we're just after a \n. */
- if (!find_nl_seq(ntohl(th->seq), ct_ftp_info, dir)) {
- /* Now if this ends in \n, update ftp info. */
- DEBUGP("ip_conntrack_ftp_help: wrong seq pos %s(%u) or %s(%u)\n",
- ct_ftp_info->seq_aft_nl[0][dir]
- old_seq_aft_nl_set ? "":"(UNSET) ", old_seq_aft_nl);
- ret = NF_ACCEPT;
- goto out_update_nl;
- }
-
- /* Initialize IP array to expected address (it's not mentioned
- in EPSV responses) */
- array[0] = (ntohl(ct->tuplehash[dir].tuple.src.ip) >> 24) & 0xFF;
- array[1] = (ntohl(ct->tuplehash[dir].tuple.src.ip) >> 16) & 0xFF;
- array[2] = (ntohl(ct->tuplehash[dir].tuple.src.ip) >> 8) & 0xFF;
- array[3] = ntohl(ct->tuplehash[dir].tuple.src.ip) & 0xFF;
-
- for (i = 0; i < ARRAY_SIZE(search[dir]); i++) {
- found = find_pattern(fb_ptr, (*pskb)->len - dataoff,
- search[dir][i].pattern,
- search[dir][i].plen,
- search[dir][i].skip,
- search[dir][i].term,
- &matchoff, &matchlen,
- array,
- search[dir][i].getnum);
- if (found) break;
- }
- if (found == -1) {
- /* We don't usually drop packets. After all, this is
- connection tracking, not packet filtering.
- However, it is necessary for accurate tracking in
- this case. */
- if (net_ratelimit())
- printk("conntrack_ftp: partial %s %u+%u\n",
- search[dir][i].pattern,
- ntohl(th->seq), datalen);
- ret = NF_DROP;
- goto out;
- } else if (found == 0) { /* No match */
- ret = NF_ACCEPT;
- goto out_update_nl;
- }
-
- DEBUGP("conntrack_ftp: match `%s' (%u bytes at %u)\n",
- fb_ptr + matchoff, matchlen, ntohl(th->seq) + matchoff);
-
- /* Allocate expectation which will be inserted */
- exp = ip_conntrack_expect_alloc(ct);
- if (exp == NULL) {
- ret = NF_DROP;
- goto out;
- }
-
- /* We refer to the reverse direction ("!dir") tuples here,
- * because we're expecting something in the other direction.
- * Doesn't matter unless NAT is happening. */
- exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
-
- if (htonl((array[0] << 24) | (array[1] << 16) | (array[2] << 8) | array[3])
- != ct->tuplehash[dir].tuple.src.ip) {
- /* Enrico Scholz's passive FTP to partially RNAT'd ftp
- server: it really wants us to connect to a
- different IP address. Simply don't record it for
- NAT. */
- DEBUGP("conntrack_ftp: NOT RECORDING: %u,%u,%u,%u != %u.%u.%u.%u\n",
- array[0], array[1], array[2], array[3],
- NIPQUAD(ct->tuplehash[dir].tuple.src.ip));
-
- /* Thanks to Cristiano Lincoln Mattos
- <lincoln@cesar.org.br> for reporting this potential
- problem (DMZ machines opening holes to internal
- networks, or the packet filter itself). */
- if (!loose) {
- ret = NF_ACCEPT;
- goto out_put_expect;
- }
- exp->tuple.dst.ip = htonl((array[0] << 24) | (array[1] << 16)
- | (array[2] << 8) | array[3]);
- }
-
- exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
- exp->tuple.dst.u.tcp.port = htons(array[4] << 8 | array[5]);
- exp->tuple.src.u.tcp.port = 0; /* Don't care. */
- exp->tuple.dst.protonum = IPPROTO_TCP;
- exp->mask = ((struct ip_conntrack_tuple)
- { { htonl(0xFFFFFFFF), { 0 } },
- { htonl(0xFFFFFFFF), { .tcp = { htons(0xFFFF) } }, 0xFF }});
-
- exp->expectfn = NULL;
- exp->flags = 0;
-
- /* Now, NAT might want to mangle the packet, and register the
- * (possibly changed) expectation itself. */
- ip_nat_ftp = rcu_dereference(ip_nat_ftp_hook);
- if (ip_nat_ftp)
- ret = ip_nat_ftp(pskb, ctinfo, search[dir][i].ftptype,
- matchoff, matchlen, exp, &seq);
- else {
- /* Can't expect this? Best to drop packet now. */
- if (ip_conntrack_expect_related(exp) != 0)
- ret = NF_DROP;
- else
- ret = NF_ACCEPT;
- }
-
-out_put_expect:
- ip_conntrack_expect_put(exp);
-
-out_update_nl:
- /* Now if this ends in \n, update ftp info. Seq may have been
- * adjusted by NAT code. */
- if (ends_in_nl)
- update_nl_seq(seq, ct_ftp_info,dir, *pskb);
- out:
- spin_unlock_bh(&ip_ftp_lock);
- return ret;
-}
-
-static struct ip_conntrack_helper ftp[MAX_PORTS];
-static char ftp_names[MAX_PORTS][sizeof("ftp-65535")];
-
-/* Not __exit: called from init() */
-static void ip_conntrack_ftp_fini(void)
-{
- int i;
- for (i = 0; i < ports_c; i++) {
- DEBUGP("ip_ct_ftp: unregistering helper for port %d\n",
- ports[i]);
- ip_conntrack_helper_unregister(&ftp[i]);
- }
-
- kfree(ftp_buffer);
-}
-
-static int __init ip_conntrack_ftp_init(void)
-{
- int i, ret;
- char *tmpname;
-
- ftp_buffer = kmalloc(65536, GFP_KERNEL);
- if (!ftp_buffer)
- return -ENOMEM;
-
- if (ports_c == 0)
- ports[ports_c++] = FTP_PORT;
-
- for (i = 0; i < ports_c; i++) {
- ftp[i].tuple.src.u.tcp.port = htons(ports[i]);
- ftp[i].tuple.dst.protonum = IPPROTO_TCP;
- ftp[i].mask.src.u.tcp.port = htons(0xFFFF);
- ftp[i].mask.dst.protonum = 0xFF;
- ftp[i].max_expected = 1;
- ftp[i].timeout = 5 * 60; /* 5 minutes */
- ftp[i].me = THIS_MODULE;
- ftp[i].help = help;
-
- tmpname = &ftp_names[i][0];
- if (ports[i] == FTP_PORT)
- sprintf(tmpname, "ftp");
- else
- sprintf(tmpname, "ftp-%d", ports[i]);
- ftp[i].name = tmpname;
-
- DEBUGP("ip_ct_ftp: registering helper for port %d\n",
- ports[i]);
- ret = ip_conntrack_helper_register(&ftp[i]);
-
- if (ret) {
- ip_conntrack_ftp_fini();
- return ret;
- }
- }
- return 0;
-}
-
-module_init(ip_conntrack_ftp_init);
-module_exit(ip_conntrack_ftp_fini);
+++ /dev/null
-/*
- * H.323 connection tracking helper
- *
- * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
- *
- * This source code is licensed under General Public License version 2.
- *
- * Based on the 'brute force' H.323 connection tracking module by
- * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
- *
- * For more information, please see http://nath323.sourceforge.net/
- */
-
-#include <linux/module.h>
-#include <linux/netfilter.h>
-#include <linux/ip.h>
-#include <net/tcp.h>
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_conntrack_core.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
-#include <linux/netfilter_ipv4/ip_conntrack_h323.h>
-#include <linux/moduleparam.h>
-#include <linux/ctype.h>
-#include <linux/inet.h>
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-/* Parameters */
-static unsigned int default_rrq_ttl = 300;
-module_param(default_rrq_ttl, uint, 0600);
-MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
-
-static int gkrouted_only = 1;
-module_param(gkrouted_only, int, 0600);
-MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
-
-static int callforward_filter = 1;
-module_param(callforward_filter, bool, 0600);
-MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
- "if both endpoints are on different sides "
- "(determined by routing information)");
-
-/* Hooks for NAT */
-int (*set_h245_addr_hook) (struct sk_buff ** pskb,
- unsigned char **data, int dataoff,
- H245_TransportAddress * addr,
- __be32 ip, u_int16_t port);
-int (*set_h225_addr_hook) (struct sk_buff ** pskb,
- unsigned char **data, int dataoff,
- TransportAddress * addr,
- __be32 ip, u_int16_t port);
-int (*set_sig_addr_hook) (struct sk_buff ** pskb,
- struct ip_conntrack * ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data,
- TransportAddress * addr, int count);
-int (*set_ras_addr_hook) (struct sk_buff ** pskb,
- struct ip_conntrack * ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data,
- TransportAddress * addr, int count);
-int (*nat_rtp_rtcp_hook) (struct sk_buff ** pskb,
- struct ip_conntrack * ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- H245_TransportAddress * addr,
- u_int16_t port, u_int16_t rtp_port,
- struct ip_conntrack_expect * rtp_exp,
- struct ip_conntrack_expect * rtcp_exp);
-int (*nat_t120_hook) (struct sk_buff ** pskb,
- struct ip_conntrack * ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- H245_TransportAddress * addr, u_int16_t port,
- struct ip_conntrack_expect * exp);
-int (*nat_h245_hook) (struct sk_buff ** pskb,
- struct ip_conntrack * ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- TransportAddress * addr, u_int16_t port,
- struct ip_conntrack_expect * exp);
-int (*nat_callforwarding_hook) (struct sk_buff ** pskb,
- struct ip_conntrack * ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- TransportAddress * addr, u_int16_t port,
- struct ip_conntrack_expect * exp);
-int (*nat_q931_hook) (struct sk_buff ** pskb,
- struct ip_conntrack * ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, TransportAddress * addr, int idx,
- u_int16_t port, struct ip_conntrack_expect * exp);
-
-
-static DEFINE_SPINLOCK(ip_h323_lock);
-static char *h323_buffer;
-
-/****************************************************************************/
-static int get_tpkt_data(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int *datalen, int *dataoff)
-{
- struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
- int dir = CTINFO2DIR(ctinfo);
- struct tcphdr _tcph, *th;
- int tcpdatalen;
- int tcpdataoff;
- unsigned char *tpkt;
- int tpktlen;
- int tpktoff;
-
- /* Get TCP header */
- th = skb_header_pointer(*pskb, ip_hdrlen(*pskb),
- sizeof(_tcph), &_tcph);
- if (th == NULL)
- return 0;
-
- /* Get TCP data offset */
- tcpdataoff = ip_hdrlen(*pskb) + th->doff * 4;
-
- /* Get TCP data length */
- tcpdatalen = (*pskb)->len - tcpdataoff;
- if (tcpdatalen <= 0) /* No TCP data */
- goto clear_out;
-
- if (*data == NULL) { /* first TPKT */
- /* Get first TPKT pointer */
- tpkt = skb_header_pointer(*pskb, tcpdataoff, tcpdatalen,
- h323_buffer);
- BUG_ON(tpkt == NULL);
-
- /* Validate TPKT identifier */
- if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
- /* Netmeeting sends TPKT header and data separately */
- if (info->tpkt_len[dir] > 0) {
- DEBUGP("ip_ct_h323: previous packet "
- "indicated separate TPKT data of %hu "
- "bytes\n", info->tpkt_len[dir]);
- if (info->tpkt_len[dir] <= tcpdatalen) {
- /* Yes, there was a TPKT header
- * received */
- *data = tpkt;
- *datalen = info->tpkt_len[dir];
- *dataoff = 0;
- goto out;
- }
-
- /* Fragmented TPKT */
- if (net_ratelimit())
- printk("ip_ct_h323: "
- "fragmented TPKT\n");
- goto clear_out;
- }
-
- /* It is not even a TPKT */
- return 0;
- }
- tpktoff = 0;
- } else { /* Next TPKT */
- tpktoff = *dataoff + *datalen;
- tcpdatalen -= tpktoff;
- if (tcpdatalen <= 4) /* No more TPKT */
- goto clear_out;
- tpkt = *data + *datalen;
-
- /* Validate TPKT identifier */
- if (tpkt[0] != 0x03 || tpkt[1] != 0)
- goto clear_out;
- }
-
- /* Validate TPKT length */
- tpktlen = tpkt[2] * 256 + tpkt[3];
- if (tpktlen < 4)
- goto clear_out;
- if (tpktlen > tcpdatalen) {
- if (tcpdatalen == 4) { /* Separate TPKT header */
- /* Netmeeting sends TPKT header and data separately */
- DEBUGP("ip_ct_h323: separate TPKT header indicates "
- "there will be TPKT data of %hu bytes\n",
- tpktlen - 4);
- info->tpkt_len[dir] = tpktlen - 4;
- return 0;
- }
-
- if (net_ratelimit())
- printk("ip_ct_h323: incomplete TPKT (fragmented?)\n");
- goto clear_out;
- }
-
- /* This is the encapsulated data */
- *data = tpkt + 4;
- *datalen = tpktlen - 4;
- *dataoff = tpktoff + 4;
-
- out:
- /* Clear TPKT length */
- info->tpkt_len[dir] = 0;
- return 1;
-
- clear_out:
- info->tpkt_len[dir] = 0;
- return 0;
-}
-
-/****************************************************************************/
-static int get_h245_addr(unsigned char *data, H245_TransportAddress * addr,
- __be32 * ip, u_int16_t * port)
-{
- unsigned char *p;
-
- if (addr->choice != eH245_TransportAddress_unicastAddress ||
- addr->unicastAddress.choice != eUnicastAddress_iPAddress)
- return 0;
-
- p = data + addr->unicastAddress.iPAddress.network;
- *ip = htonl((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | (p[3]));
- *port = (p[4] << 8) | (p[5]);
-
- return 1;
-}
-
-/****************************************************************************/
-static int expect_rtp_rtcp(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- H245_TransportAddress * addr)
-{
- int dir = CTINFO2DIR(ctinfo);
- int ret = 0;
- __be32 ip;
- u_int16_t port;
- u_int16_t rtp_port;
- struct ip_conntrack_expect *rtp_exp;
- struct ip_conntrack_expect *rtcp_exp;
- typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
-
- /* Read RTP or RTCP address */
- if (!get_h245_addr(*data, addr, &ip, &port) ||
- ip != ct->tuplehash[dir].tuple.src.ip || port == 0)
- return 0;
-
- /* RTP port is even */
- rtp_port = port & (~1);
-
- /* Create expect for RTP */
- if ((rtp_exp = ip_conntrack_expect_alloc(ct)) == NULL)
- return -1;
- rtp_exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
- rtp_exp->tuple.src.u.udp.port = 0;
- rtp_exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
- rtp_exp->tuple.dst.u.udp.port = htons(rtp_port);
- rtp_exp->tuple.dst.protonum = IPPROTO_UDP;
- rtp_exp->mask.src.ip = htonl(0xFFFFFFFF);
- rtp_exp->mask.src.u.udp.port = 0;
- rtp_exp->mask.dst.ip = htonl(0xFFFFFFFF);
- rtp_exp->mask.dst.u.udp.port = htons(0xFFFF);
- rtp_exp->mask.dst.protonum = 0xFF;
- rtp_exp->flags = 0;
-
- /* Create expect for RTCP */
- if ((rtcp_exp = ip_conntrack_expect_alloc(ct)) == NULL) {
- ip_conntrack_expect_put(rtp_exp);
- return -1;
- }
- rtcp_exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
- rtcp_exp->tuple.src.u.udp.port = 0;
- rtcp_exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
- rtcp_exp->tuple.dst.u.udp.port = htons(rtp_port + 1);
- rtcp_exp->tuple.dst.protonum = IPPROTO_UDP;
- rtcp_exp->mask.src.ip = htonl(0xFFFFFFFF);
- rtcp_exp->mask.src.u.udp.port = 0;
- rtcp_exp->mask.dst.ip = htonl(0xFFFFFFFF);
- rtcp_exp->mask.dst.u.udp.port = htons(0xFFFF);
- rtcp_exp->mask.dst.protonum = 0xFF;
- rtcp_exp->flags = 0;
-
- if (ct->tuplehash[dir].tuple.src.ip !=
- ct->tuplehash[!dir].tuple.dst.ip &&
- (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook))) {
- /* NAT needed */
- ret = nat_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
- addr, port, rtp_port, rtp_exp, rtcp_exp);
- } else { /* Conntrack only */
- rtp_exp->expectfn = NULL;
- rtcp_exp->expectfn = NULL;
-
- if (ip_conntrack_expect_related(rtp_exp) == 0) {
- if (ip_conntrack_expect_related(rtcp_exp) == 0) {
- DEBUGP("ip_ct_h323: expect RTP "
- "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(rtp_exp->tuple.src.ip),
- ntohs(rtp_exp->tuple.src.u.udp.port),
- NIPQUAD(rtp_exp->tuple.dst.ip),
- ntohs(rtp_exp->tuple.dst.u.udp.port));
- DEBUGP("ip_ct_h323: expect RTCP "
- "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(rtcp_exp->tuple.src.ip),
- ntohs(rtcp_exp->tuple.src.u.udp.port),
- NIPQUAD(rtcp_exp->tuple.dst.ip),
- ntohs(rtcp_exp->tuple.dst.u.udp.port));
- } else {
- ip_conntrack_unexpect_related(rtp_exp);
- ret = -1;
- }
- } else
- ret = -1;
- }
-
- ip_conntrack_expect_put(rtp_exp);
- ip_conntrack_expect_put(rtcp_exp);
-
- return ret;
-}
-
-/****************************************************************************/
-static int expect_t120(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- H245_TransportAddress * addr)
-{
- int dir = CTINFO2DIR(ctinfo);
- int ret = 0;
- __be32 ip;
- u_int16_t port;
- struct ip_conntrack_expect *exp = NULL;
- typeof(nat_t120_hook) nat_t120;
-
- /* Read T.120 address */
- if (!get_h245_addr(*data, addr, &ip, &port) ||
- ip != ct->tuplehash[dir].tuple.src.ip || port == 0)
- return 0;
-
- /* Create expect for T.120 connections */
- if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
- return -1;
- exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
- exp->tuple.src.u.tcp.port = 0;
- exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
- exp->tuple.dst.u.tcp.port = htons(port);
- exp->tuple.dst.protonum = IPPROTO_TCP;
- exp->mask.src.ip = htonl(0xFFFFFFFF);
- exp->mask.src.u.tcp.port = 0;
- exp->mask.dst.ip = htonl(0xFFFFFFFF);
- exp->mask.dst.u.tcp.port = htons(0xFFFF);
- exp->mask.dst.protonum = 0xFF;
- exp->flags = IP_CT_EXPECT_PERMANENT; /* Accept multiple channels */
-
- if (ct->tuplehash[dir].tuple.src.ip !=
- ct->tuplehash[!dir].tuple.dst.ip &&
- (nat_t120 = rcu_dereference(nat_t120_hook))) {
- /* NAT needed */
- ret = nat_t120(pskb, ct, ctinfo, data, dataoff, addr,
- port, exp);
- } else { /* Conntrack only */
- exp->expectfn = NULL;
- if (ip_conntrack_expect_related(exp) == 0) {
- DEBUGP("ip_ct_h323: expect T.120 "
- "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(exp->tuple.src.ip),
- ntohs(exp->tuple.src.u.tcp.port),
- NIPQUAD(exp->tuple.dst.ip),
- ntohs(exp->tuple.dst.u.tcp.port));
- } else
- ret = -1;
- }
-
- ip_conntrack_expect_put(exp);
-
- return ret;
-}
-
-/****************************************************************************/
-static int process_h245_channel(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- H2250LogicalChannelParameters * channel)
-{
- int ret;
-
- if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
- /* RTP */
- ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
- &channel->mediaChannel);
- if (ret < 0)
- return -1;
- }
-
- if (channel->
- options & eH2250LogicalChannelParameters_mediaControlChannel) {
- /* RTCP */
- ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
- &channel->mediaControlChannel);
- if (ret < 0)
- return -1;
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int process_olc(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- OpenLogicalChannel * olc)
-{
- int ret;
-
- DEBUGP("ip_ct_h323: OpenLogicalChannel\n");
-
- if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
- eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
- {
- ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff,
- &olc->
- forwardLogicalChannelParameters.
- multiplexParameters.
- h2250LogicalChannelParameters);
- if (ret < 0)
- return -1;
- }
-
- if ((olc->options &
- eOpenLogicalChannel_reverseLogicalChannelParameters) &&
- (olc->reverseLogicalChannelParameters.options &
- eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
- && (olc->reverseLogicalChannelParameters.multiplexParameters.
- choice ==
- eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
- {
- ret =
- process_h245_channel(pskb, ct, ctinfo, data, dataoff,
- &olc->
- reverseLogicalChannelParameters.
- multiplexParameters.
- h2250LogicalChannelParameters);
- if (ret < 0)
- return -1;
- }
-
- if ((olc->options & eOpenLogicalChannel_separateStack) &&
- olc->forwardLogicalChannelParameters.dataType.choice ==
- eDataType_data &&
- olc->forwardLogicalChannelParameters.dataType.data.application.
- choice == eDataApplicationCapability_application_t120 &&
- olc->forwardLogicalChannelParameters.dataType.data.application.
- t120.choice == eDataProtocolCapability_separateLANStack &&
- olc->separateStack.networkAddress.choice ==
- eNetworkAccessParameters_networkAddress_localAreaAddress) {
- ret = expect_t120(pskb, ct, ctinfo, data, dataoff,
- &olc->separateStack.networkAddress.
- localAreaAddress);
- if (ret < 0)
- return -1;
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int process_olca(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- OpenLogicalChannelAck * olca)
-{
- H2250LogicalChannelAckParameters *ack;
- int ret;
-
- DEBUGP("ip_ct_h323: OpenLogicalChannelAck\n");
-
- if ((olca->options &
- eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
- (olca->reverseLogicalChannelParameters.options &
- eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
- && (olca->reverseLogicalChannelParameters.multiplexParameters.
- choice ==
- eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
- {
- ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff,
- &olca->
- reverseLogicalChannelParameters.
- multiplexParameters.
- h2250LogicalChannelParameters);
- if (ret < 0)
- return -1;
- }
-
- if ((olca->options &
- eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
- (olca->forwardMultiplexAckParameters.choice ==
- eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
- {
- ack = &olca->forwardMultiplexAckParameters.
- h2250LogicalChannelAckParameters;
- if (ack->options &
- eH2250LogicalChannelAckParameters_mediaChannel) {
- /* RTP */
- ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
- &ack->mediaChannel);
- if (ret < 0)
- return -1;
- }
-
- if (ack->options &
- eH2250LogicalChannelAckParameters_mediaControlChannel) {
- /* RTCP */
- ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
- &ack->mediaControlChannel);
- if (ret < 0)
- return -1;
- }
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int process_h245(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- MultimediaSystemControlMessage * mscm)
-{
- switch (mscm->choice) {
- case eMultimediaSystemControlMessage_request:
- if (mscm->request.choice ==
- eRequestMessage_openLogicalChannel) {
- return process_olc(pskb, ct, ctinfo, data, dataoff,
- &mscm->request.openLogicalChannel);
- }
- DEBUGP("ip_ct_h323: H.245 Request %d\n",
- mscm->request.choice);
- break;
- case eMultimediaSystemControlMessage_response:
- if (mscm->response.choice ==
- eResponseMessage_openLogicalChannelAck) {
- return process_olca(pskb, ct, ctinfo, data, dataoff,
- &mscm->response.
- openLogicalChannelAck);
- }
- DEBUGP("ip_ct_h323: H.245 Response %d\n",
- mscm->response.choice);
- break;
- default:
- DEBUGP("ip_ct_h323: H.245 signal %d\n", mscm->choice);
- break;
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int h245_help(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo)
-{
- static MultimediaSystemControlMessage mscm;
- unsigned char *data = NULL;
- int datalen;
- int dataoff;
- int ret;
-
- /* Until there's been traffic both ways, don't look in packets. */
- if (ctinfo != IP_CT_ESTABLISHED
- && ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
- return NF_ACCEPT;
- }
- DEBUGP("ip_ct_h245: skblen = %u\n", (*pskb)->len);
-
- spin_lock_bh(&ip_h323_lock);
-
- /* Process each TPKT */
- while (get_tpkt_data(pskb, ct, ctinfo, &data, &datalen, &dataoff)) {
- DEBUGP("ip_ct_h245: TPKT %u.%u.%u.%u->%u.%u.%u.%u, len=%d\n",
- NIPQUAD(ip_hdr(*pskb)->saddr),
- NIPQUAD(ip_hdr(*pskb)->daddr), datalen);
-
- /* Decode H.245 signal */
- ret = DecodeMultimediaSystemControlMessage(data, datalen,
- &mscm);
- if (ret < 0) {
- if (net_ratelimit())
- printk("ip_ct_h245: decoding error: %s\n",
- ret == H323_ERROR_BOUND ?
- "out of bound" : "out of range");
- /* We don't drop when decoding error */
- break;
- }
-
- /* Process H.245 signal */
- if (process_h245(pskb, ct, ctinfo, &data, dataoff, &mscm) < 0)
- goto drop;
- }
-
- spin_unlock_bh(&ip_h323_lock);
- return NF_ACCEPT;
-
- drop:
- spin_unlock_bh(&ip_h323_lock);
- if (net_ratelimit())
- printk("ip_ct_h245: packet dropped\n");
- return NF_DROP;
-}
-
-/****************************************************************************/
-static struct ip_conntrack_helper ip_conntrack_helper_h245 = {
- .name = "H.245",
- .me = THIS_MODULE,
- .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */ ,
- .timeout = 240,
- .tuple = {.dst = {.protonum = IPPROTO_TCP}},
- .mask = {.src = {.u = {0xFFFF}},
- .dst = {.protonum = 0xFF}},
- .help = h245_help
-};
-
-/****************************************************************************/
-void ip_conntrack_h245_expect(struct ip_conntrack *new,
- struct ip_conntrack_expect *this)
-{
- write_lock_bh(&ip_conntrack_lock);
- new->helper = &ip_conntrack_helper_h245;
- write_unlock_bh(&ip_conntrack_lock);
-}
-
-/****************************************************************************/
-int get_h225_addr(unsigned char *data, TransportAddress * addr,
- __be32 * ip, u_int16_t * port)
-{
- unsigned char *p;
-
- if (addr->choice != eTransportAddress_ipAddress)
- return 0;
-
- p = data + addr->ipAddress.ip;
- *ip = htonl((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | (p[3]));
- *port = (p[4] << 8) | (p[5]);
-
- return 1;
-}
-
-/****************************************************************************/
-static int expect_h245(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- TransportAddress * addr)
-{
- int dir = CTINFO2DIR(ctinfo);
- int ret = 0;
- __be32 ip;
- u_int16_t port;
- struct ip_conntrack_expect *exp = NULL;
- typeof(nat_h245_hook) nat_h245;
-
- /* Read h245Address */
- if (!get_h225_addr(*data, addr, &ip, &port) ||
- ip != ct->tuplehash[dir].tuple.src.ip || port == 0)
- return 0;
-
- /* Create expect for h245 connection */
- if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
- return -1;
- exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
- exp->tuple.src.u.tcp.port = 0;
- exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
- exp->tuple.dst.u.tcp.port = htons(port);
- exp->tuple.dst.protonum = IPPROTO_TCP;
- exp->mask.src.ip = htonl(0xFFFFFFFF);
- exp->mask.src.u.tcp.port = 0;
- exp->mask.dst.ip = htonl(0xFFFFFFFF);
- exp->mask.dst.u.tcp.port = htons(0xFFFF);
- exp->mask.dst.protonum = 0xFF;
- exp->flags = 0;
-
- if (ct->tuplehash[dir].tuple.src.ip !=
- ct->tuplehash[!dir].tuple.dst.ip &&
- (nat_h245 = rcu_dereference(nat_h245_hook))) {
- /* NAT needed */
- ret = nat_h245(pskb, ct, ctinfo, data, dataoff, addr,
- port, exp);
- } else { /* Conntrack only */
- exp->expectfn = ip_conntrack_h245_expect;
-
- if (ip_conntrack_expect_related(exp) == 0) {
- DEBUGP("ip_ct_q931: expect H.245 "
- "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(exp->tuple.src.ip),
- ntohs(exp->tuple.src.u.tcp.port),
- NIPQUAD(exp->tuple.dst.ip),
- ntohs(exp->tuple.dst.u.tcp.port));
- } else
- ret = -1;
- }
-
- ip_conntrack_expect_put(exp);
-
- return ret;
-}
-
-/* Forwarding declaration */
-void ip_conntrack_q931_expect(struct ip_conntrack *new,
- struct ip_conntrack_expect *this);
-
-/****************************************************************************/
-static int expect_callforwarding(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- TransportAddress * addr)
-{
- int dir = CTINFO2DIR(ctinfo);
- int ret = 0;
- __be32 ip;
- u_int16_t port;
- struct ip_conntrack_expect *exp = NULL;
- typeof(nat_callforwarding_hook) nat_callforwarding;
-
- /* Read alternativeAddress */
- if (!get_h225_addr(*data, addr, &ip, &port) || port == 0)
- return 0;
-
- /* If the calling party is on the same side of the forward-to party,
- * we don't need to track the second call */
- if (callforward_filter) {
- struct rtable *rt1, *rt2;
- struct flowi fl1 = {
- .fl4_dst = ip,
- };
- struct flowi fl2 = {
- .fl4_dst = ct->tuplehash[!dir].tuple.src.ip,
- };
-
- if (ip_route_output_key(&rt1, &fl1) == 0) {
- if (ip_route_output_key(&rt2, &fl2) == 0) {
- if (rt1->rt_gateway == rt2->rt_gateway &&
- rt1->u.dst.dev == rt2->u.dst.dev)
- ret = 1;
- dst_release(&rt2->u.dst);
- }
- dst_release(&rt1->u.dst);
- }
- if (ret) {
- DEBUGP("ip_ct_q931: Call Forwarding not tracked\n");
- return 0;
- }
- }
-
- /* Create expect for the second call leg */
- if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
- return -1;
- exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
- exp->tuple.src.u.tcp.port = 0;
- exp->tuple.dst.ip = ip;
- exp->tuple.dst.u.tcp.port = htons(port);
- exp->tuple.dst.protonum = IPPROTO_TCP;
- exp->mask.src.ip = htonl(0xFFFFFFFF);
- exp->mask.src.u.tcp.port = 0;
- exp->mask.dst.ip = htonl(0xFFFFFFFF);
- exp->mask.dst.u.tcp.port = htons(0xFFFF);
- exp->mask.dst.protonum = 0xFF;
- exp->flags = 0;
-
- if (ct->tuplehash[dir].tuple.src.ip !=
- ct->tuplehash[!dir].tuple.dst.ip &&
- (nat_callforwarding = rcu_dereference(nat_callforwarding_hook))) {
- /* Need NAT */
- ret = nat_callforwarding(pskb, ct, ctinfo, data, dataoff,
- addr, port, exp);
- } else { /* Conntrack only */
- exp->expectfn = ip_conntrack_q931_expect;
-
- if (ip_conntrack_expect_related(exp) == 0) {
- DEBUGP("ip_ct_q931: expect Call Forwarding "
- "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(exp->tuple.src.ip),
- ntohs(exp->tuple.src.u.tcp.port),
- NIPQUAD(exp->tuple.dst.ip),
- ntohs(exp->tuple.dst.u.tcp.port));
- } else
- ret = -1;
- }
-
- ip_conntrack_expect_put(exp);
-
- return ret;
-}
-
-/****************************************************************************/
-static int process_setup(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- Setup_UUIE * setup)
-{
- int dir = CTINFO2DIR(ctinfo);
- int ret;
- int i;
- __be32 ip;
- u_int16_t port;
- typeof(set_h225_addr_hook) set_h225_addr;
-
- DEBUGP("ip_ct_q931: Setup\n");
-
- if (setup->options & eSetup_UUIE_h245Address) {
- ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
- &setup->h245Address);
- if (ret < 0)
- return -1;
- }
-
- set_h225_addr = rcu_dereference(set_h225_addr_hook);
-
- if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
- (set_h225_addr) &&
- get_h225_addr(*data, &setup->destCallSignalAddress, &ip, &port) &&
- ip != ct->tuplehash[!dir].tuple.src.ip) {
- DEBUGP("ip_ct_q931: set destCallSignalAddress "
- "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(ip), port,
- NIPQUAD(ct->tuplehash[!dir].tuple.src.ip),
- ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
- ret = set_h225_addr(pskb, data, dataoff,
- &setup->destCallSignalAddress,
- ct->tuplehash[!dir].tuple.src.ip,
- ntohs(ct->tuplehash[!dir].tuple.src.
- u.tcp.port));
- if (ret < 0)
- return -1;
- }
-
- if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
- (set_h225_addr) &&
- get_h225_addr(*data, &setup->sourceCallSignalAddress, &ip, &port)
- && ip != ct->tuplehash[!dir].tuple.dst.ip) {
- DEBUGP("ip_ct_q931: set sourceCallSignalAddress "
- "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(ip), port,
- NIPQUAD(ct->tuplehash[!dir].tuple.dst.ip),
- ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
- ret = set_h225_addr(pskb, data, dataoff,
- &setup->sourceCallSignalAddress,
- ct->tuplehash[!dir].tuple.dst.ip,
- ntohs(ct->tuplehash[!dir].tuple.dst.
- u.tcp.port));
- if (ret < 0)
- return -1;
- }
-
- if (setup->options & eSetup_UUIE_fastStart) {
- for (i = 0; i < setup->fastStart.count; i++) {
- ret = process_olc(pskb, ct, ctinfo, data, dataoff,
- &setup->fastStart.item[i]);
- if (ret < 0)
- return -1;
- }
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int process_callproceeding(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- CallProceeding_UUIE * callproc)
-{
- int ret;
- int i;
-
- DEBUGP("ip_ct_q931: CallProceeding\n");
-
- if (callproc->options & eCallProceeding_UUIE_h245Address) {
- ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
- &callproc->h245Address);
- if (ret < 0)
- return -1;
- }
-
- if (callproc->options & eCallProceeding_UUIE_fastStart) {
- for (i = 0; i < callproc->fastStart.count; i++) {
- ret = process_olc(pskb, ct, ctinfo, data, dataoff,
- &callproc->fastStart.item[i]);
- if (ret < 0)
- return -1;
- }
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int process_connect(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- Connect_UUIE * connect)
-{
- int ret;
- int i;
-
- DEBUGP("ip_ct_q931: Connect\n");
-
- if (connect->options & eConnect_UUIE_h245Address) {
- ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
- &connect->h245Address);
- if (ret < 0)
- return -1;
- }
-
- if (connect->options & eConnect_UUIE_fastStart) {
- for (i = 0; i < connect->fastStart.count; i++) {
- ret = process_olc(pskb, ct, ctinfo, data, dataoff,
- &connect->fastStart.item[i]);
- if (ret < 0)
- return -1;
- }
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int process_alerting(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- Alerting_UUIE * alert)
-{
- int ret;
- int i;
-
- DEBUGP("ip_ct_q931: Alerting\n");
-
- if (alert->options & eAlerting_UUIE_h245Address) {
- ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
- &alert->h245Address);
- if (ret < 0)
- return -1;
- }
-
- if (alert->options & eAlerting_UUIE_fastStart) {
- for (i = 0; i < alert->fastStart.count; i++) {
- ret = process_olc(pskb, ct, ctinfo, data, dataoff,
- &alert->fastStart.item[i]);
- if (ret < 0)
- return -1;
- }
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int process_information(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- Information_UUIE * info)
-{
- int ret;
- int i;
-
- DEBUGP("ip_ct_q931: Information\n");
-
- if (info->options & eInformation_UUIE_fastStart) {
- for (i = 0; i < info->fastStart.count; i++) {
- ret = process_olc(pskb, ct, ctinfo, data, dataoff,
- &info->fastStart.item[i]);
- if (ret < 0)
- return -1;
- }
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int process_facility(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- Facility_UUIE * facility)
-{
- int ret;
- int i;
-
- DEBUGP("ip_ct_q931: Facility\n");
-
- if (facility->reason.choice == eFacilityReason_callForwarded) {
- if (facility->options & eFacility_UUIE_alternativeAddress)
- return expect_callforwarding(pskb, ct, ctinfo, data,
- dataoff,
- &facility->
- alternativeAddress);
- return 0;
- }
-
- if (facility->options & eFacility_UUIE_h245Address) {
- ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
- &facility->h245Address);
- if (ret < 0)
- return -1;
- }
-
- if (facility->options & eFacility_UUIE_fastStart) {
- for (i = 0; i < facility->fastStart.count; i++) {
- ret = process_olc(pskb, ct, ctinfo, data, dataoff,
- &facility->fastStart.item[i]);
- if (ret < 0)
- return -1;
- }
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int process_progress(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- Progress_UUIE * progress)
-{
- int ret;
- int i;
-
- DEBUGP("ip_ct_q931: Progress\n");
-
- if (progress->options & eProgress_UUIE_h245Address) {
- ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
- &progress->h245Address);
- if (ret < 0)
- return -1;
- }
-
- if (progress->options & eProgress_UUIE_fastStart) {
- for (i = 0; i < progress->fastStart.count; i++) {
- ret = process_olc(pskb, ct, ctinfo, data, dataoff,
- &progress->fastStart.item[i]);
- if (ret < 0)
- return -1;
- }
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int process_q931(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff, Q931 * q931)
-{
- H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
- int i;
- int ret = 0;
-
- switch (pdu->h323_message_body.choice) {
- case eH323_UU_PDU_h323_message_body_setup:
- ret = process_setup(pskb, ct, ctinfo, data, dataoff,
- &pdu->h323_message_body.setup);
- break;
- case eH323_UU_PDU_h323_message_body_callProceeding:
- ret = process_callproceeding(pskb, ct, ctinfo, data, dataoff,
- &pdu->h323_message_body.
- callProceeding);
- break;
- case eH323_UU_PDU_h323_message_body_connect:
- ret = process_connect(pskb, ct, ctinfo, data, dataoff,
- &pdu->h323_message_body.connect);
- break;
- case eH323_UU_PDU_h323_message_body_alerting:
- ret = process_alerting(pskb, ct, ctinfo, data, dataoff,
- &pdu->h323_message_body.alerting);
- break;
- case eH323_UU_PDU_h323_message_body_information:
- ret = process_information(pskb, ct, ctinfo, data, dataoff,
- &pdu->h323_message_body.
- information);
- break;
- case eH323_UU_PDU_h323_message_body_facility:
- ret = process_facility(pskb, ct, ctinfo, data, dataoff,
- &pdu->h323_message_body.facility);
- break;
- case eH323_UU_PDU_h323_message_body_progress:
- ret = process_progress(pskb, ct, ctinfo, data, dataoff,
- &pdu->h323_message_body.progress);
- break;
- default:
- DEBUGP("ip_ct_q931: Q.931 signal %d\n",
- pdu->h323_message_body.choice);
- break;
- }
-
- if (ret < 0)
- return -1;
-
- if (pdu->options & eH323_UU_PDU_h245Control) {
- for (i = 0; i < pdu->h245Control.count; i++) {
- ret = process_h245(pskb, ct, ctinfo, data, dataoff,
- &pdu->h245Control.item[i]);
- if (ret < 0)
- return -1;
- }
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int q931_help(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo)
-{
- static Q931 q931;
- unsigned char *data = NULL;
- int datalen;
- int dataoff;
- int ret;
-
- /* Until there's been traffic both ways, don't look in packets. */
- if (ctinfo != IP_CT_ESTABLISHED
- && ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
- return NF_ACCEPT;
- }
- DEBUGP("ip_ct_q931: skblen = %u\n", (*pskb)->len);
-
- spin_lock_bh(&ip_h323_lock);
-
- /* Process each TPKT */
- while (get_tpkt_data(pskb, ct, ctinfo, &data, &datalen, &dataoff)) {
- DEBUGP("ip_ct_q931: TPKT %u.%u.%u.%u->%u.%u.%u.%u, len=%d\n",
- NIPQUAD(ip_hdr(*pskb)->saddr),
- NIPQUAD(ip_hdr(*pskb)->daddr), datalen);
-
- /* Decode Q.931 signal */
- ret = DecodeQ931(data, datalen, &q931);
- if (ret < 0) {
- if (net_ratelimit())
- printk("ip_ct_q931: decoding error: %s\n",
- ret == H323_ERROR_BOUND ?
- "out of bound" : "out of range");
- /* We don't drop when decoding error */
- break;
- }
-
- /* Process Q.931 signal */
- if (process_q931(pskb, ct, ctinfo, &data, dataoff, &q931) < 0)
- goto drop;
- }
-
- spin_unlock_bh(&ip_h323_lock);
- return NF_ACCEPT;
-
- drop:
- spin_unlock_bh(&ip_h323_lock);
- if (net_ratelimit())
- printk("ip_ct_q931: packet dropped\n");
- return NF_DROP;
-}
-
-/****************************************************************************/
-static struct ip_conntrack_helper ip_conntrack_helper_q931 = {
- .name = "Q.931",
- .me = THIS_MODULE,
- .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4 /* T.120 and H.245 */ ,
- .timeout = 240,
- .tuple = {.src = {.u = {.tcp = {.port = __constant_htons(Q931_PORT)}}},
- .dst = {.protonum = IPPROTO_TCP}},
- .mask = {.src = {.u = {0xFFFF}},
- .dst = {.protonum = 0xFF}},
- .help = q931_help
-};
-
-/****************************************************************************/
-void ip_conntrack_q931_expect(struct ip_conntrack *new,
- struct ip_conntrack_expect *this)
-{
- write_lock_bh(&ip_conntrack_lock);
- new->helper = &ip_conntrack_helper_q931;
- write_unlock_bh(&ip_conntrack_lock);
-}
-
-/****************************************************************************/
-static unsigned char *get_udp_data(struct sk_buff **pskb, int *datalen)
-{
- struct udphdr _uh, *uh;
- int dataoff;
-
- uh = skb_header_pointer(*pskb, ip_hdrlen(*pskb), sizeof(_uh), &_uh);
- if (uh == NULL)
- return NULL;
- dataoff = ip_hdrlen(*pskb) + sizeof(_uh);
- if (dataoff >= (*pskb)->len)
- return NULL;
- *datalen = (*pskb)->len - dataoff;
- return skb_header_pointer(*pskb, dataoff, *datalen, h323_buffer);
-}
-
-/****************************************************************************/
-static struct ip_conntrack_expect *find_expect(struct ip_conntrack *ct,
- __be32 ip, u_int16_t port)
-{
- struct ip_conntrack_expect *exp;
- struct ip_conntrack_tuple tuple;
-
- tuple.src.ip = 0;
- tuple.src.u.tcp.port = 0;
- tuple.dst.ip = ip;
- tuple.dst.u.tcp.port = htons(port);
- tuple.dst.protonum = IPPROTO_TCP;
-
- exp = __ip_conntrack_expect_find(&tuple);
- if (exp && exp->master == ct)
- return exp;
- return NULL;
-}
-
-/****************************************************************************/
-static int set_expect_timeout(struct ip_conntrack_expect *exp,
- unsigned timeout)
-{
- if (!exp || !del_timer(&exp->timeout))
- return 0;
-
- exp->timeout.expires = jiffies + timeout * HZ;
- add_timer(&exp->timeout);
-
- return 1;
-}
-
-/****************************************************************************/
-static int expect_q931(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data,
- TransportAddress * addr, int count)
-{
- struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
- int dir = CTINFO2DIR(ctinfo);
- int ret = 0;
- int i;
- __be32 ip;
- u_int16_t port;
- struct ip_conntrack_expect *exp;
- typeof(nat_q931_hook) nat_q931;
-
- /* Look for the first related address */
- for (i = 0; i < count; i++) {
- if (get_h225_addr(*data, &addr[i], &ip, &port) &&
- ip == ct->tuplehash[dir].tuple.src.ip && port != 0)
- break;
- }
-
- if (i >= count) /* Not found */
- return 0;
-
- /* Create expect for Q.931 */
- if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
- return -1;
- exp->tuple.src.ip = gkrouted_only ? /* only accept calls from GK? */
- ct->tuplehash[!dir].tuple.src.ip : 0;
- exp->tuple.src.u.tcp.port = 0;
- exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
- exp->tuple.dst.u.tcp.port = htons(port);
- exp->tuple.dst.protonum = IPPROTO_TCP;
- exp->mask.src.ip = gkrouted_only ? htonl(0xFFFFFFFF) : 0;
- exp->mask.src.u.tcp.port = 0;
- exp->mask.dst.ip = htonl(0xFFFFFFFF);
- exp->mask.dst.u.tcp.port = htons(0xFFFF);
- exp->mask.dst.protonum = 0xFF;
- exp->flags = IP_CT_EXPECT_PERMANENT; /* Accept multiple calls */
-
- nat_q931 = rcu_dereference(nat_q931_hook);
- if (nat_q931) { /* Need NAT */
- ret = nat_q931(pskb, ct, ctinfo, data, addr, i, port, exp);
- } else { /* Conntrack only */
- exp->expectfn = ip_conntrack_q931_expect;
-
- if (ip_conntrack_expect_related(exp) == 0) {
- DEBUGP("ip_ct_ras: expect Q.931 "
- "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(exp->tuple.src.ip),
- ntohs(exp->tuple.src.u.tcp.port),
- NIPQUAD(exp->tuple.dst.ip),
- ntohs(exp->tuple.dst.u.tcp.port));
-
- /* Save port for looking up expect in processing RCF */
- info->sig_port[dir] = port;
- } else
- ret = -1;
- }
-
- ip_conntrack_expect_put(exp);
-
- return ret;
-}
-
-/****************************************************************************/
-static int process_grq(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, GatekeeperRequest * grq)
-{
- typeof(set_ras_addr_hook) set_ras_addr;
-
- DEBUGP("ip_ct_ras: GRQ\n");
-
- set_ras_addr = rcu_dereference(set_ras_addr_hook);
- if (set_ras_addr) /* NATed */
- return set_ras_addr(pskb, ct, ctinfo, data,
- &grq->rasAddress, 1);
- return 0;
-}
-
-/* Declare before using */
-static void ip_conntrack_ras_expect(struct ip_conntrack *new,
- struct ip_conntrack_expect *this);
-
-/****************************************************************************/
-static int process_gcf(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, GatekeeperConfirm * gcf)
-{
- int dir = CTINFO2DIR(ctinfo);
- int ret = 0;
- __be32 ip;
- u_int16_t port;
- struct ip_conntrack_expect *exp;
-
- DEBUGP("ip_ct_ras: GCF\n");
-
- if (!get_h225_addr(*data, &gcf->rasAddress, &ip, &port))
- return 0;
-
- /* Registration port is the same as discovery port */
- if (ip == ct->tuplehash[dir].tuple.src.ip &&
- port == ntohs(ct->tuplehash[dir].tuple.src.u.udp.port))
- return 0;
-
- /* Avoid RAS expectation loops. A GCF is never expected. */
- if (test_bit(IPS_EXPECTED_BIT, &ct->status))
- return 0;
-
- /* Need new expect */
- if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
- return -1;
- exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
- exp->tuple.src.u.tcp.port = 0;
- exp->tuple.dst.ip = ip;
- exp->tuple.dst.u.tcp.port = htons(port);
- exp->tuple.dst.protonum = IPPROTO_UDP;
- exp->mask.src.ip = htonl(0xFFFFFFFF);
- exp->mask.src.u.tcp.port = 0;
- exp->mask.dst.ip = htonl(0xFFFFFFFF);
- exp->mask.dst.u.tcp.port = htons(0xFFFF);
- exp->mask.dst.protonum = 0xFF;
- exp->flags = 0;
- exp->expectfn = ip_conntrack_ras_expect;
- if (ip_conntrack_expect_related(exp) == 0) {
- DEBUGP("ip_ct_ras: expect RAS "
- "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(exp->tuple.src.ip),
- ntohs(exp->tuple.src.u.tcp.port),
- NIPQUAD(exp->tuple.dst.ip),
- ntohs(exp->tuple.dst.u.tcp.port));
- } else
- ret = -1;
-
- ip_conntrack_expect_put(exp);
-
- return ret;
-}
-
-/****************************************************************************/
-static int process_rrq(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, RegistrationRequest * rrq)
-{
- struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
- int ret;
- typeof(set_ras_addr_hook) set_ras_addr;
-
- DEBUGP("ip_ct_ras: RRQ\n");
-
- ret = expect_q931(pskb, ct, ctinfo, data,
- rrq->callSignalAddress.item,
- rrq->callSignalAddress.count);
- if (ret < 0)
- return -1;
-
- set_ras_addr = rcu_dereference(set_ras_addr_hook);
- if (set_ras_addr) {
- ret = set_ras_addr(pskb, ct, ctinfo, data,
- rrq->rasAddress.item,
- rrq->rasAddress.count);
- if (ret < 0)
- return -1;
- }
-
- if (rrq->options & eRegistrationRequest_timeToLive) {
- DEBUGP("ip_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
- info->timeout = rrq->timeToLive;
- } else
- info->timeout = default_rrq_ttl;
-
- return 0;
-}
-
-/****************************************************************************/
-static int process_rcf(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, RegistrationConfirm * rcf)
-{
- struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
- int dir = CTINFO2DIR(ctinfo);
- int ret;
- struct ip_conntrack_expect *exp;
- typeof(set_sig_addr_hook) set_sig_addr;
-
- DEBUGP("ip_ct_ras: RCF\n");
-
- set_sig_addr = rcu_dereference(set_sig_addr_hook);
- if (set_sig_addr) {
- ret = set_sig_addr(pskb, ct, ctinfo, data,
- rcf->callSignalAddress.item,
- rcf->callSignalAddress.count);
- if (ret < 0)
- return -1;
- }
-
- if (rcf->options & eRegistrationConfirm_timeToLive) {
- DEBUGP("ip_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
- info->timeout = rcf->timeToLive;
- }
-
- if (info->timeout > 0) {
- DEBUGP
- ("ip_ct_ras: set RAS connection timeout to %u seconds\n",
- info->timeout);
- ip_ct_refresh(ct, *pskb, info->timeout * HZ);
-
- /* Set expect timeout */
- read_lock_bh(&ip_conntrack_lock);
- exp = find_expect(ct, ct->tuplehash[dir].tuple.dst.ip,
- info->sig_port[!dir]);
- if (exp) {
- DEBUGP("ip_ct_ras: set Q.931 expect "
- "(%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu) "
- "timeout to %u seconds\n",
- NIPQUAD(exp->tuple.src.ip),
- ntohs(exp->tuple.src.u.tcp.port),
- NIPQUAD(exp->tuple.dst.ip),
- ntohs(exp->tuple.dst.u.tcp.port),
- info->timeout);
- set_expect_timeout(exp, info->timeout);
- }
- read_unlock_bh(&ip_conntrack_lock);
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int process_urq(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, UnregistrationRequest * urq)
-{
- struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
- int dir = CTINFO2DIR(ctinfo);
- int ret;
- typeof(set_sig_addr_hook) set_sig_addr;
-
- DEBUGP("ip_ct_ras: URQ\n");
-
- set_sig_addr = rcu_dereference(set_sig_addr_hook);
- if (set_sig_addr) {
- ret = set_sig_addr(pskb, ct, ctinfo, data,
- urq->callSignalAddress.item,
- urq->callSignalAddress.count);
- if (ret < 0)
- return -1;
- }
-
- /* Clear old expect */
- ip_ct_remove_expectations(ct);
- info->sig_port[dir] = 0;
- info->sig_port[!dir] = 0;
-
- /* Give it 30 seconds for UCF or URJ */
- ip_ct_refresh(ct, *pskb, 30 * HZ);
-
- return 0;
-}
-
-/****************************************************************************/
-static int process_arq(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, AdmissionRequest * arq)
-{
- struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
- int dir = CTINFO2DIR(ctinfo);
- __be32 ip;
- u_int16_t port;
- typeof(set_h225_addr_hook) set_h225_addr;
-
- DEBUGP("ip_ct_ras: ARQ\n");
-
- set_h225_addr = rcu_dereference(set_h225_addr_hook);
- if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
- get_h225_addr(*data, &arq->destCallSignalAddress, &ip, &port) &&
- ip == ct->tuplehash[dir].tuple.src.ip &&
- port == info->sig_port[dir] && set_h225_addr) {
- /* Answering ARQ */
- return set_h225_addr(pskb, data, 0,
- &arq->destCallSignalAddress,
- ct->tuplehash[!dir].tuple.dst.ip,
- info->sig_port[!dir]);
- }
-
- if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
- get_h225_addr(*data, &arq->srcCallSignalAddress, &ip, &port) &&
- ip == ct->tuplehash[dir].tuple.src.ip && set_h225_addr) {
- /* Calling ARQ */
- return set_h225_addr(pskb, data, 0,
- &arq->srcCallSignalAddress,
- ct->tuplehash[!dir].tuple.dst.ip,
- port);
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int process_acf(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, AdmissionConfirm * acf)
-{
- int dir = CTINFO2DIR(ctinfo);
- int ret = 0;
- __be32 ip;
- u_int16_t port;
- struct ip_conntrack_expect *exp;
- typeof(set_sig_addr_hook) set_sig_addr;
-
- DEBUGP("ip_ct_ras: ACF\n");
-
- if (!get_h225_addr(*data, &acf->destCallSignalAddress, &ip, &port))
- return 0;
-
- if (ip == ct->tuplehash[dir].tuple.dst.ip) { /* Answering ACF */
- set_sig_addr = rcu_dereference(set_sig_addr_hook);
- if (set_sig_addr)
- return set_sig_addr(pskb, ct, ctinfo, data,
- &acf->destCallSignalAddress, 1);
- return 0;
- }
-
- /* Need new expect */
- if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
- return -1;
- exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
- exp->tuple.src.u.tcp.port = 0;
- exp->tuple.dst.ip = ip;
- exp->tuple.dst.u.tcp.port = htons(port);
- exp->tuple.dst.protonum = IPPROTO_TCP;
- exp->mask.src.ip = htonl(0xFFFFFFFF);
- exp->mask.src.u.tcp.port = 0;
- exp->mask.dst.ip = htonl(0xFFFFFFFF);
- exp->mask.dst.u.tcp.port = htons(0xFFFF);
- exp->mask.dst.protonum = 0xFF;
- exp->flags = IP_CT_EXPECT_PERMANENT;
- exp->expectfn = ip_conntrack_q931_expect;
-
- if (ip_conntrack_expect_related(exp) == 0) {
- DEBUGP("ip_ct_ras: expect Q.931 "
- "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(exp->tuple.src.ip),
- ntohs(exp->tuple.src.u.tcp.port),
- NIPQUAD(exp->tuple.dst.ip),
- ntohs(exp->tuple.dst.u.tcp.port));
- } else
- ret = -1;
-
- ip_conntrack_expect_put(exp);
-
- return ret;
-}
-
-/****************************************************************************/
-static int process_lrq(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, LocationRequest * lrq)
-{
- typeof(set_ras_addr_hook) set_ras_addr;
-
- DEBUGP("ip_ct_ras: LRQ\n");
-
- set_ras_addr = rcu_dereference(set_ras_addr_hook);
- if (set_ras_addr)
- return set_ras_addr(pskb, ct, ctinfo, data,
- &lrq->replyAddress, 1);
- return 0;
-}
-
-/****************************************************************************/
-static int process_lcf(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, LocationConfirm * lcf)
-{
- int dir = CTINFO2DIR(ctinfo);
- int ret = 0;
- __be32 ip;
- u_int16_t port;
- struct ip_conntrack_expect *exp = NULL;
-
- DEBUGP("ip_ct_ras: LCF\n");
-
- if (!get_h225_addr(*data, &lcf->callSignalAddress, &ip, &port))
- return 0;
-
- /* Need new expect for call signal */
- if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
- return -1;
- exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
- exp->tuple.src.u.tcp.port = 0;
- exp->tuple.dst.ip = ip;
- exp->tuple.dst.u.tcp.port = htons(port);
- exp->tuple.dst.protonum = IPPROTO_TCP;
- exp->mask.src.ip = htonl(0xFFFFFFFF);
- exp->mask.src.u.tcp.port = 0;
- exp->mask.dst.ip = htonl(0xFFFFFFFF);
- exp->mask.dst.u.tcp.port = htons(0xFFFF);
- exp->mask.dst.protonum = 0xFF;
- exp->flags = IP_CT_EXPECT_PERMANENT;
- exp->expectfn = ip_conntrack_q931_expect;
-
- if (ip_conntrack_expect_related(exp) == 0) {
- DEBUGP("ip_ct_ras: expect Q.931 "
- "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(exp->tuple.src.ip),
- ntohs(exp->tuple.src.u.tcp.port),
- NIPQUAD(exp->tuple.dst.ip),
- ntohs(exp->tuple.dst.u.tcp.port));
- } else
- ret = -1;
-
- ip_conntrack_expect_put(exp);
-
- /* Ignore rasAddress */
-
- return ret;
-}
-
-/****************************************************************************/
-static int process_irr(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, InfoRequestResponse * irr)
-{
- int ret;
- typeof(set_ras_addr_hook) set_ras_addr;
- typeof(set_sig_addr_hook) set_sig_addr;
-
- DEBUGP("ip_ct_ras: IRR\n");
-
- set_ras_addr = rcu_dereference(set_ras_addr_hook);
- if (set_ras_addr) {
- ret = set_ras_addr(pskb, ct, ctinfo, data,
- &irr->rasAddress, 1);
- if (ret < 0)
- return -1;
- }
-
- set_sig_addr = rcu_dereference(set_sig_addr_hook);
- if (set_sig_addr) {
- ret = set_sig_addr(pskb, ct, ctinfo, data,
- irr->callSignalAddress.item,
- irr->callSignalAddress.count);
- if (ret < 0)
- return -1;
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int process_ras(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, RasMessage * ras)
-{
- switch (ras->choice) {
- case eRasMessage_gatekeeperRequest:
- return process_grq(pskb, ct, ctinfo, data,
- &ras->gatekeeperRequest);
- case eRasMessage_gatekeeperConfirm:
- return process_gcf(pskb, ct, ctinfo, data,
- &ras->gatekeeperConfirm);
- case eRasMessage_registrationRequest:
- return process_rrq(pskb, ct, ctinfo, data,
- &ras->registrationRequest);
- case eRasMessage_registrationConfirm:
- return process_rcf(pskb, ct, ctinfo, data,
- &ras->registrationConfirm);
- case eRasMessage_unregistrationRequest:
- return process_urq(pskb, ct, ctinfo, data,
- &ras->unregistrationRequest);
- case eRasMessage_admissionRequest:
- return process_arq(pskb, ct, ctinfo, data,
- &ras->admissionRequest);
- case eRasMessage_admissionConfirm:
- return process_acf(pskb, ct, ctinfo, data,
- &ras->admissionConfirm);
- case eRasMessage_locationRequest:
- return process_lrq(pskb, ct, ctinfo, data,
- &ras->locationRequest);
- case eRasMessage_locationConfirm:
- return process_lcf(pskb, ct, ctinfo, data,
- &ras->locationConfirm);
- case eRasMessage_infoRequestResponse:
- return process_irr(pskb, ct, ctinfo, data,
- &ras->infoRequestResponse);
- default:
- DEBUGP("ip_ct_ras: RAS message %d\n", ras->choice);
- break;
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int ras_help(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo)
-{
- static RasMessage ras;
- unsigned char *data;
- int datalen = 0;
- int ret;
-
- DEBUGP("ip_ct_ras: skblen = %u\n", (*pskb)->len);
-
- spin_lock_bh(&ip_h323_lock);
-
- /* Get UDP data */
- data = get_udp_data(pskb, &datalen);
- if (data == NULL)
- goto accept;
- DEBUGP("ip_ct_ras: RAS message %u.%u.%u.%u->%u.%u.%u.%u, len=%d\n",
- NIPQUAD(ip_hdr(*pskb)->saddr),
- NIPQUAD(ip_hdr(*pskb)->daddr), datalen);
-
- /* Decode RAS message */
- ret = DecodeRasMessage(data, datalen, &ras);
- if (ret < 0) {
- if (net_ratelimit())
- printk("ip_ct_ras: decoding error: %s\n",
- ret == H323_ERROR_BOUND ?
- "out of bound" : "out of range");
- goto accept;
- }
-
- /* Process RAS message */
- if (process_ras(pskb, ct, ctinfo, &data, &ras) < 0)
- goto drop;
-
- accept:
- spin_unlock_bh(&ip_h323_lock);
- return NF_ACCEPT;
-
- drop:
- spin_unlock_bh(&ip_h323_lock);
- if (net_ratelimit())
- printk("ip_ct_ras: packet dropped\n");
- return NF_DROP;
-}
-
-/****************************************************************************/
-static struct ip_conntrack_helper ip_conntrack_helper_ras = {
- .name = "RAS",
- .me = THIS_MODULE,
- .max_expected = 32,
- .timeout = 240,
- .tuple = {.src = {.u = {.tcp = {.port = __constant_htons(RAS_PORT)}}},
- .dst = {.protonum = IPPROTO_UDP}},
- .mask = {.src = {.u = {0xFFFE}},
- .dst = {.protonum = 0xFF}},
- .help = ras_help,
-};
-
-/****************************************************************************/
-static void ip_conntrack_ras_expect(struct ip_conntrack *new,
- struct ip_conntrack_expect *this)
-{
- write_lock_bh(&ip_conntrack_lock);
- new->helper = &ip_conntrack_helper_ras;
- write_unlock_bh(&ip_conntrack_lock);
-}
-
-/****************************************************************************/
-/* Not __exit - called from init() */
-static void fini(void)
-{
- ip_conntrack_helper_unregister(&ip_conntrack_helper_ras);
- ip_conntrack_helper_unregister(&ip_conntrack_helper_q931);
- kfree(h323_buffer);
- DEBUGP("ip_ct_h323: fini\n");
-}
-
-/****************************************************************************/
-static int __init init(void)
-{
- int ret;
-
- h323_buffer = kmalloc(65536, GFP_KERNEL);
- if (!h323_buffer)
- return -ENOMEM;
- if ((ret = ip_conntrack_helper_register(&ip_conntrack_helper_q931)) ||
- (ret = ip_conntrack_helper_register(&ip_conntrack_helper_ras))) {
- fini();
- return ret;
- }
- DEBUGP("ip_ct_h323: init success\n");
- return 0;
-}
-
-/****************************************************************************/
-module_init(init);
-module_exit(fini);
-
-EXPORT_SYMBOL_GPL(get_h225_addr);
-EXPORT_SYMBOL_GPL(ip_conntrack_h245_expect);
-EXPORT_SYMBOL_GPL(ip_conntrack_q931_expect);
-EXPORT_SYMBOL_GPL(set_h245_addr_hook);
-EXPORT_SYMBOL_GPL(set_h225_addr_hook);
-EXPORT_SYMBOL_GPL(set_sig_addr_hook);
-EXPORT_SYMBOL_GPL(set_ras_addr_hook);
-EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
-EXPORT_SYMBOL_GPL(nat_t120_hook);
-EXPORT_SYMBOL_GPL(nat_h245_hook);
-EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
-EXPORT_SYMBOL_GPL(nat_q931_hook);
-
-MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
-MODULE_DESCRIPTION("H.323 connection tracking helper");
-MODULE_LICENSE("GPL");
+++ /dev/null
-/*
- * ip_conntrack_pptp.c - Version 3.0
- *
- * Connection tracking support for PPTP (Point to Point Tunneling Protocol).
- * PPTP is a a protocol for creating virtual private networks.
- * It is a specification defined by Microsoft and some vendors
- * working with Microsoft. PPTP is built on top of a modified
- * version of the Internet Generic Routing Encapsulation Protocol.
- * GRE is defined in RFC 1701 and RFC 1702. Documentation of
- * PPTP can be found in RFC 2637
- *
- * (C) 2000-2005 by Harald Welte <laforge@gnumonks.org>
- *
- * Development of this code funded by Astaro AG (http://www.astaro.com/)
- *
- * Limitations:
- * - We blindly assume that control connections are always
- * established in PNS->PAC direction. This is a violation
- * of RFFC2673
- * - We can only support one single call within each session
- *
- * TODO:
- * - testing of incoming PPTP calls
- *
- * Changes:
- * 2002-02-05 - Version 1.3
- * - Call ip_conntrack_unexpect_related() from
- * pptp_destroy_siblings() to destroy expectations in case
- * CALL_DISCONNECT_NOTIFY or tcp fin packet was seen
- * (Philip Craig <philipc@snapgear.com>)
- * - Add Version information at module loadtime
- * 2002-02-10 - Version 1.6
- * - move to C99 style initializers
- * - remove second expectation if first arrives
- * 2004-10-22 - Version 2.0
- * - merge Mandrake's 2.6.x port with recent 2.6.x API changes
- * - fix lots of linear skb assumptions from Mandrake's port
- * 2005-06-10 - Version 2.1
- * - use ip_conntrack_expect_free() instead of kfree() on the
- * expect's (which are from the slab for quite some time)
- * 2005-06-10 - Version 3.0
- * - port helper to post-2.6.11 API changes,
- * funded by Oxcoda NetBox Blue (http://www.netboxblue.com/)
- * 2005-07-30 - Version 3.1
- * - port helper to 2.6.13 API changes
- *
- */
-
-#include <linux/module.h>
-#include <linux/netfilter.h>
-#include <linux/ip.h>
-#include <net/checksum.h>
-#include <net/tcp.h>
-
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_conntrack_core.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h>
-#include <linux/netfilter_ipv4/ip_conntrack_pptp.h>
-
-#define IP_CT_PPTP_VERSION "3.1"
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
-MODULE_DESCRIPTION("Netfilter connection tracking helper module for PPTP");
-
-static DEFINE_SPINLOCK(ip_pptp_lock);
-
-int
-(*ip_nat_pptp_hook_outbound)(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- struct PptpControlHeader *ctlh,
- union pptp_ctrl_union *pptpReq);
-
-int
-(*ip_nat_pptp_hook_inbound)(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- struct PptpControlHeader *ctlh,
- union pptp_ctrl_union *pptpReq);
-
-void
-(*ip_nat_pptp_hook_exp_gre)(struct ip_conntrack_expect *expect_orig,
- struct ip_conntrack_expect *expect_reply);
-
-void
-(*ip_nat_pptp_hook_expectfn)(struct ip_conntrack *ct,
- struct ip_conntrack_expect *exp);
-
-#if 0
-/* PptpControlMessageType names */
-const char *pptp_msg_name[] = {
- "UNKNOWN_MESSAGE",
- "START_SESSION_REQUEST",
- "START_SESSION_REPLY",
- "STOP_SESSION_REQUEST",
- "STOP_SESSION_REPLY",
- "ECHO_REQUEST",
- "ECHO_REPLY",
- "OUT_CALL_REQUEST",
- "OUT_CALL_REPLY",
- "IN_CALL_REQUEST",
- "IN_CALL_REPLY",
- "IN_CALL_CONNECT",
- "CALL_CLEAR_REQUEST",
- "CALL_DISCONNECT_NOTIFY",
- "WAN_ERROR_NOTIFY",
- "SET_LINK_INFO"
-};
-EXPORT_SYMBOL(pptp_msg_name);
-#define DEBUGP(format, args...) printk(KERN_DEBUG "%s:%s: " format, __FILE__, __FUNCTION__, ## args)
-#else
-#define DEBUGP(format, args...)
-#endif
-
-#define SECS *HZ
-#define MINS * 60 SECS
-#define HOURS * 60 MINS
-
-#define PPTP_GRE_TIMEOUT (10 MINS)
-#define PPTP_GRE_STREAM_TIMEOUT (5 HOURS)
-
-static void pptp_expectfn(struct ip_conntrack *ct,
- struct ip_conntrack_expect *exp)
-{
- typeof(ip_nat_pptp_hook_expectfn) ip_nat_pptp_expectfn;
-
- DEBUGP("increasing timeouts\n");
-
- /* increase timeout of GRE data channel conntrack entry */
- ct->proto.gre.timeout = PPTP_GRE_TIMEOUT;
- ct->proto.gre.stream_timeout = PPTP_GRE_STREAM_TIMEOUT;
-
- /* Can you see how rusty this code is, compared with the pre-2.6.11
- * one? That's what happened to my shiny newnat of 2002 ;( -HW */
-
- rcu_read_lock();
- ip_nat_pptp_expectfn = rcu_dereference(ip_nat_pptp_hook_expectfn);
- if (!ip_nat_pptp_expectfn) {
- struct ip_conntrack_tuple inv_t;
- struct ip_conntrack_expect *exp_other;
-
- /* obviously this tuple inversion only works until you do NAT */
- invert_tuplepr(&inv_t, &exp->tuple);
- DEBUGP("trying to unexpect other dir: ");
- DUMP_TUPLE(&inv_t);
-
- exp_other = ip_conntrack_expect_find_get(&inv_t);
- if (exp_other) {
- /* delete other expectation. */
- DEBUGP("found\n");
- ip_conntrack_unexpect_related(exp_other);
- ip_conntrack_expect_put(exp_other);
- } else {
- DEBUGP("not found\n");
- }
- } else {
- /* we need more than simple inversion */
- ip_nat_pptp_expectfn(ct, exp);
- }
- rcu_read_unlock();
-}
-
-static int destroy_sibling_or_exp(const struct ip_conntrack_tuple *t)
-{
- struct ip_conntrack_tuple_hash *h;
- struct ip_conntrack_expect *exp;
-
- DEBUGP("trying to timeout ct or exp for tuple ");
- DUMP_TUPLE(t);
-
- h = ip_conntrack_find_get(t, NULL);
- if (h) {
- struct ip_conntrack *sibling = tuplehash_to_ctrack(h);
- DEBUGP("setting timeout of conntrack %p to 0\n", sibling);
- sibling->proto.gre.timeout = 0;
- sibling->proto.gre.stream_timeout = 0;
- if (del_timer(&sibling->timeout))
- sibling->timeout.function((unsigned long)sibling);
- ip_conntrack_put(sibling);
- return 1;
- } else {
- exp = ip_conntrack_expect_find_get(t);
- if (exp) {
- DEBUGP("unexpect_related of expect %p\n", exp);
- ip_conntrack_unexpect_related(exp);
- ip_conntrack_expect_put(exp);
- return 1;
- }
- }
-
- return 0;
-}
-
-
-/* timeout GRE data connections */
-static void pptp_destroy_siblings(struct ip_conntrack *ct)
-{
- struct ip_conntrack_tuple t;
-
- ip_ct_gre_keymap_destroy(ct);
- /* Since ct->sibling_list has literally rusted away in 2.6.11,
- * we now need another way to find out about our sibling
- * contrack and expects... -HW */
-
- /* try original (pns->pac) tuple */
- memcpy(&t, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, sizeof(t));
- t.dst.protonum = IPPROTO_GRE;
- t.src.u.gre.key = ct->help.ct_pptp_info.pns_call_id;
- t.dst.u.gre.key = ct->help.ct_pptp_info.pac_call_id;
-
- if (!destroy_sibling_or_exp(&t))
- DEBUGP("failed to timeout original pns->pac ct/exp\n");
-
- /* try reply (pac->pns) tuple */
- memcpy(&t, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, sizeof(t));
- t.dst.protonum = IPPROTO_GRE;
- t.src.u.gre.key = ct->help.ct_pptp_info.pac_call_id;
- t.dst.u.gre.key = ct->help.ct_pptp_info.pns_call_id;
-
- if (!destroy_sibling_or_exp(&t))
- DEBUGP("failed to timeout reply pac->pns ct/exp\n");
-}
-
-/* expect GRE connections (PNS->PAC and PAC->PNS direction) */
-static inline int
-exp_gre(struct ip_conntrack *ct,
- __be16 callid,
- __be16 peer_callid)
-{
- struct ip_conntrack_expect *exp_orig, *exp_reply;
- int ret = 1;
- typeof(ip_nat_pptp_hook_exp_gre) ip_nat_pptp_exp_gre;
-
- exp_orig = ip_conntrack_expect_alloc(ct);
- if (exp_orig == NULL)
- goto out;
-
- exp_reply = ip_conntrack_expect_alloc(ct);
- if (exp_reply == NULL)
- goto out_put_orig;
-
- /* original direction, PNS->PAC */
- exp_orig->tuple.src.ip = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip;
- exp_orig->tuple.src.u.gre.key = peer_callid;
- exp_orig->tuple.dst.ip = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip;
- exp_orig->tuple.dst.u.gre.key = callid;
- exp_orig->tuple.dst.protonum = IPPROTO_GRE;
-
- exp_orig->mask.src.ip = htonl(0xffffffff);
- exp_orig->mask.src.u.all = 0;
- exp_orig->mask.dst.u.gre.key = htons(0xffff);
- exp_orig->mask.dst.ip = htonl(0xffffffff);
- exp_orig->mask.dst.protonum = 0xff;
-
- exp_orig->master = ct;
- exp_orig->expectfn = pptp_expectfn;
- exp_orig->flags = 0;
-
- /* both expectations are identical apart from tuple */
- memcpy(exp_reply, exp_orig, sizeof(*exp_reply));
-
- /* reply direction, PAC->PNS */
- exp_reply->tuple.src.ip = ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip;
- exp_reply->tuple.src.u.gre.key = callid;
- exp_reply->tuple.dst.ip = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip;
- exp_reply->tuple.dst.u.gre.key = peer_callid;
- exp_reply->tuple.dst.protonum = IPPROTO_GRE;
-
- ip_nat_pptp_exp_gre = rcu_dereference(ip_nat_pptp_hook_exp_gre);
- if (ip_nat_pptp_exp_gre)
- ip_nat_pptp_exp_gre(exp_orig, exp_reply);
- if (ip_conntrack_expect_related(exp_orig) != 0)
- goto out_put_both;
- if (ip_conntrack_expect_related(exp_reply) != 0)
- goto out_unexpect_orig;
-
- /* Add GRE keymap entries */
- if (ip_ct_gre_keymap_add(ct, &exp_orig->tuple, 0) != 0)
- goto out_unexpect_both;
- if (ip_ct_gre_keymap_add(ct, &exp_reply->tuple, 1) != 0) {
- ip_ct_gre_keymap_destroy(ct);
- goto out_unexpect_both;
- }
- ret = 0;
-
-out_put_both:
- ip_conntrack_expect_put(exp_reply);
-out_put_orig:
- ip_conntrack_expect_put(exp_orig);
-out:
- return ret;
-
-out_unexpect_both:
- ip_conntrack_unexpect_related(exp_reply);
-out_unexpect_orig:
- ip_conntrack_unexpect_related(exp_orig);
- goto out_put_both;
-}
-
-static inline int
-pptp_inbound_pkt(struct sk_buff **pskb,
- struct PptpControlHeader *ctlh,
- union pptp_ctrl_union *pptpReq,
- unsigned int reqlen,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo)
-{
- struct ip_ct_pptp_master *info = &ct->help.ct_pptp_info;
- u_int16_t msg;
- __be16 cid = 0, pcid = 0;
- typeof(ip_nat_pptp_hook_inbound) ip_nat_pptp_inbound;
-
- msg = ntohs(ctlh->messageType);
- DEBUGP("inbound control message %s\n", pptp_msg_name[msg]);
-
- switch (msg) {
- case PPTP_START_SESSION_REPLY:
- /* server confirms new control session */
- if (info->sstate < PPTP_SESSION_REQUESTED)
- goto invalid;
- if (pptpReq->srep.resultCode == PPTP_START_OK)
- info->sstate = PPTP_SESSION_CONFIRMED;
- else
- info->sstate = PPTP_SESSION_ERROR;
- break;
-
- case PPTP_STOP_SESSION_REPLY:
- /* server confirms end of control session */
- if (info->sstate > PPTP_SESSION_STOPREQ)
- goto invalid;
- if (pptpReq->strep.resultCode == PPTP_STOP_OK)
- info->sstate = PPTP_SESSION_NONE;
- else
- info->sstate = PPTP_SESSION_ERROR;
- break;
-
- case PPTP_OUT_CALL_REPLY:
- /* server accepted call, we now expect GRE frames */
- if (info->sstate != PPTP_SESSION_CONFIRMED)
- goto invalid;
- if (info->cstate != PPTP_CALL_OUT_REQ &&
- info->cstate != PPTP_CALL_OUT_CONF)
- goto invalid;
-
- cid = pptpReq->ocack.callID;
- pcid = pptpReq->ocack.peersCallID;
- if (info->pns_call_id != pcid)
- goto invalid;
- DEBUGP("%s, CID=%X, PCID=%X\n", pptp_msg_name[msg],
- ntohs(cid), ntohs(pcid));
-
- if (pptpReq->ocack.resultCode == PPTP_OUTCALL_CONNECT) {
- info->cstate = PPTP_CALL_OUT_CONF;
- info->pac_call_id = cid;
- exp_gre(ct, cid, pcid);
- } else
- info->cstate = PPTP_CALL_NONE;
- break;
-
- case PPTP_IN_CALL_REQUEST:
- /* server tells us about incoming call request */
- if (info->sstate != PPTP_SESSION_CONFIRMED)
- goto invalid;
-
- cid = pptpReq->icreq.callID;
- DEBUGP("%s, CID=%X\n", pptp_msg_name[msg], ntohs(cid));
- info->cstate = PPTP_CALL_IN_REQ;
- info->pac_call_id = cid;
- break;
-
- case PPTP_IN_CALL_CONNECT:
- /* server tells us about incoming call established */
- if (info->sstate != PPTP_SESSION_CONFIRMED)
- goto invalid;
- if (info->cstate != PPTP_CALL_IN_REP &&
- info->cstate != PPTP_CALL_IN_CONF)
- goto invalid;
-
- pcid = pptpReq->iccon.peersCallID;
- cid = info->pac_call_id;
-
- if (info->pns_call_id != pcid)
- goto invalid;
-
- DEBUGP("%s, PCID=%X\n", pptp_msg_name[msg], ntohs(pcid));
- info->cstate = PPTP_CALL_IN_CONF;
-
- /* we expect a GRE connection from PAC to PNS */
- exp_gre(ct, cid, pcid);
- break;
-
- case PPTP_CALL_DISCONNECT_NOTIFY:
- /* server confirms disconnect */
- cid = pptpReq->disc.callID;
- DEBUGP("%s, CID=%X\n", pptp_msg_name[msg], ntohs(cid));
- info->cstate = PPTP_CALL_NONE;
-
- /* untrack this call id, unexpect GRE packets */
- pptp_destroy_siblings(ct);
- break;
-
- case PPTP_WAN_ERROR_NOTIFY:
- case PPTP_ECHO_REQUEST:
- case PPTP_ECHO_REPLY:
- /* I don't have to explain these ;) */
- break;
- default:
- goto invalid;
- }
-
- ip_nat_pptp_inbound = rcu_dereference(ip_nat_pptp_hook_inbound);
- if (ip_nat_pptp_inbound)
- return ip_nat_pptp_inbound(pskb, ct, ctinfo, ctlh, pptpReq);
- return NF_ACCEPT;
-
-invalid:
- DEBUGP("invalid %s: type=%d cid=%u pcid=%u "
- "cstate=%d sstate=%d pns_cid=%u pac_cid=%u\n",
- msg <= PPTP_MSG_MAX ? pptp_msg_name[msg] : pptp_msg_name[0],
- msg, ntohs(cid), ntohs(pcid), info->cstate, info->sstate,
- ntohs(info->pns_call_id), ntohs(info->pac_call_id));
- return NF_ACCEPT;
-}
-
-static inline int
-pptp_outbound_pkt(struct sk_buff **pskb,
- struct PptpControlHeader *ctlh,
- union pptp_ctrl_union *pptpReq,
- unsigned int reqlen,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo)
-{
- struct ip_ct_pptp_master *info = &ct->help.ct_pptp_info;
- u_int16_t msg;
- __be16 cid = 0, pcid = 0;
- typeof(ip_nat_pptp_hook_outbound) ip_nat_pptp_outbound;
-
- msg = ntohs(ctlh->messageType);
- DEBUGP("outbound control message %s\n", pptp_msg_name[msg]);
-
- switch (msg) {
- case PPTP_START_SESSION_REQUEST:
- /* client requests for new control session */
- if (info->sstate != PPTP_SESSION_NONE)
- goto invalid;
- info->sstate = PPTP_SESSION_REQUESTED;
- break;
- case PPTP_STOP_SESSION_REQUEST:
- /* client requests end of control session */
- info->sstate = PPTP_SESSION_STOPREQ;
- break;
-
- case PPTP_OUT_CALL_REQUEST:
- /* client initiating connection to server */
- if (info->sstate != PPTP_SESSION_CONFIRMED)
- goto invalid;
- info->cstate = PPTP_CALL_OUT_REQ;
- /* track PNS call id */
- cid = pptpReq->ocreq.callID;
- DEBUGP("%s, CID=%X\n", pptp_msg_name[msg], ntohs(cid));
- info->pns_call_id = cid;
- break;
- case PPTP_IN_CALL_REPLY:
- /* client answers incoming call */
- if (info->cstate != PPTP_CALL_IN_REQ &&
- info->cstate != PPTP_CALL_IN_REP)
- goto invalid;
-
- cid = pptpReq->icack.callID;
- pcid = pptpReq->icack.peersCallID;
- if (info->pac_call_id != pcid)
- goto invalid;
- DEBUGP("%s, CID=%X PCID=%X\n", pptp_msg_name[msg],
- ntohs(cid), ntohs(pcid));
-
- if (pptpReq->icack.resultCode == PPTP_INCALL_ACCEPT) {
- /* part two of the three-way handshake */
- info->cstate = PPTP_CALL_IN_REP;
- info->pns_call_id = cid;
- } else
- info->cstate = PPTP_CALL_NONE;
- break;
-
- case PPTP_CALL_CLEAR_REQUEST:
- /* client requests hangup of call */
- if (info->sstate != PPTP_SESSION_CONFIRMED)
- goto invalid;
- /* FUTURE: iterate over all calls and check if
- * call ID is valid. We don't do this without newnat,
- * because we only know about last call */
- info->cstate = PPTP_CALL_CLEAR_REQ;
- break;
- case PPTP_SET_LINK_INFO:
- case PPTP_ECHO_REQUEST:
- case PPTP_ECHO_REPLY:
- /* I don't have to explain these ;) */
- break;
- default:
- goto invalid;
- }
-
- ip_nat_pptp_outbound = rcu_dereference(ip_nat_pptp_hook_outbound);
- if (ip_nat_pptp_outbound)
- return ip_nat_pptp_outbound(pskb, ct, ctinfo, ctlh, pptpReq);
- return NF_ACCEPT;
-
-invalid:
- DEBUGP("invalid %s: type=%d cid=%u pcid=%u "
- "cstate=%d sstate=%d pns_cid=%u pac_cid=%u\n",
- msg <= PPTP_MSG_MAX ? pptp_msg_name[msg] : pptp_msg_name[0],
- msg, ntohs(cid), ntohs(pcid), info->cstate, info->sstate,
- ntohs(info->pns_call_id), ntohs(info->pac_call_id));
- return NF_ACCEPT;
-}
-
-static const unsigned int pptp_msg_size[] = {
- [PPTP_START_SESSION_REQUEST] = sizeof(struct PptpStartSessionRequest),
- [PPTP_START_SESSION_REPLY] = sizeof(struct PptpStartSessionReply),
- [PPTP_STOP_SESSION_REQUEST] = sizeof(struct PptpStopSessionRequest),
- [PPTP_STOP_SESSION_REPLY] = sizeof(struct PptpStopSessionReply),
- [PPTP_OUT_CALL_REQUEST] = sizeof(struct PptpOutCallRequest),
- [PPTP_OUT_CALL_REPLY] = sizeof(struct PptpOutCallReply),
- [PPTP_IN_CALL_REQUEST] = sizeof(struct PptpInCallRequest),
- [PPTP_IN_CALL_REPLY] = sizeof(struct PptpInCallReply),
- [PPTP_IN_CALL_CONNECT] = sizeof(struct PptpInCallConnected),
- [PPTP_CALL_CLEAR_REQUEST] = sizeof(struct PptpClearCallRequest),
- [PPTP_CALL_DISCONNECT_NOTIFY] = sizeof(struct PptpCallDisconnectNotify),
- [PPTP_WAN_ERROR_NOTIFY] = sizeof(struct PptpWanErrorNotify),
- [PPTP_SET_LINK_INFO] = sizeof(struct PptpSetLinkInfo),
-};
-
-/* track caller id inside control connection, call expect_related */
-static int
-conntrack_pptp_help(struct sk_buff **pskb,
- struct ip_conntrack *ct, enum ip_conntrack_info ctinfo)
-
-{
- int dir = CTINFO2DIR(ctinfo);
- struct ip_ct_pptp_master *info = &ct->help.ct_pptp_info;
- struct tcphdr _tcph, *tcph;
- struct pptp_pkt_hdr _pptph, *pptph;
- struct PptpControlHeader _ctlh, *ctlh;
- union pptp_ctrl_union _pptpReq, *pptpReq;
- unsigned int tcplen = (*pskb)->len - ip_hdrlen(*pskb);
- unsigned int datalen, reqlen, nexthdr_off;
- int oldsstate, oldcstate;
- int ret;
- u_int16_t msg;
-
- /* don't do any tracking before tcp handshake complete */
- if (ctinfo != IP_CT_ESTABLISHED
- && ctinfo != IP_CT_ESTABLISHED+IP_CT_IS_REPLY) {
- DEBUGP("ctinfo = %u, skipping\n", ctinfo);
- return NF_ACCEPT;
- }
-
- nexthdr_off = ip_hdrlen(*pskb);
- tcph = skb_header_pointer(*pskb, nexthdr_off, sizeof(_tcph), &_tcph);
- BUG_ON(!tcph);
- nexthdr_off += tcph->doff * 4;
- datalen = tcplen - tcph->doff * 4;
-
- pptph = skb_header_pointer(*pskb, nexthdr_off, sizeof(_pptph), &_pptph);
- if (!pptph) {
- DEBUGP("no full PPTP header, can't track\n");
- return NF_ACCEPT;
- }
- nexthdr_off += sizeof(_pptph);
- datalen -= sizeof(_pptph);
-
- /* if it's not a control message we can't do anything with it */
- if (ntohs(pptph->packetType) != PPTP_PACKET_CONTROL ||
- ntohl(pptph->magicCookie) != PPTP_MAGIC_COOKIE) {
- DEBUGP("not a control packet\n");
- return NF_ACCEPT;
- }
-
- ctlh = skb_header_pointer(*pskb, nexthdr_off, sizeof(_ctlh), &_ctlh);
- if (!ctlh)
- return NF_ACCEPT;
- nexthdr_off += sizeof(_ctlh);
- datalen -= sizeof(_ctlh);
-
- reqlen = datalen;
- msg = ntohs(ctlh->messageType);
- if (msg > 0 && msg <= PPTP_MSG_MAX && reqlen < pptp_msg_size[msg])
- return NF_ACCEPT;
- if (reqlen > sizeof(*pptpReq))
- reqlen = sizeof(*pptpReq);
-
- pptpReq = skb_header_pointer(*pskb, nexthdr_off, reqlen, &_pptpReq);
- if (!pptpReq)
- return NF_ACCEPT;
-
- oldsstate = info->sstate;
- oldcstate = info->cstate;
-
- spin_lock_bh(&ip_pptp_lock);
-
- /* FIXME: We just blindly assume that the control connection is always
- * established from PNS->PAC. However, RFC makes no guarantee */
- if (dir == IP_CT_DIR_ORIGINAL)
- /* client -> server (PNS -> PAC) */
- ret = pptp_outbound_pkt(pskb, ctlh, pptpReq, reqlen, ct,
- ctinfo);
- else
- /* server -> client (PAC -> PNS) */
- ret = pptp_inbound_pkt(pskb, ctlh, pptpReq, reqlen, ct,
- ctinfo);
- DEBUGP("sstate: %d->%d, cstate: %d->%d\n",
- oldsstate, info->sstate, oldcstate, info->cstate);
- spin_unlock_bh(&ip_pptp_lock);
-
- return ret;
-}
-
-/* control protocol helper */
-static struct ip_conntrack_helper pptp = {
- .list = { NULL, NULL },
- .name = "pptp",
- .me = THIS_MODULE,
- .max_expected = 2,
- .timeout = 5 * 60,
- .tuple = { .src = { .ip = 0,
- .u = { .tcp = { .port =
- __constant_htons(PPTP_CONTROL_PORT) } }
- },
- .dst = { .ip = 0,
- .u = { .all = 0 },
- .protonum = IPPROTO_TCP
- }
- },
- .mask = { .src = { .ip = 0,
- .u = { .tcp = { .port = __constant_htons(0xffff) } }
- },
- .dst = { .ip = 0,
- .u = { .all = 0 },
- .protonum = 0xff
- }
- },
- .help = conntrack_pptp_help,
- .destroy = pptp_destroy_siblings,
-};
-
-extern void ip_ct_proto_gre_fini(void);
-extern int __init ip_ct_proto_gre_init(void);
-
-/* ip_conntrack_pptp initialization */
-static int __init ip_conntrack_helper_pptp_init(void)
-{
- int retcode;
-
- retcode = ip_ct_proto_gre_init();
- if (retcode < 0)
- return retcode;
-
- DEBUGP(" registering helper\n");
- if ((retcode = ip_conntrack_helper_register(&pptp))) {
- printk(KERN_ERR "Unable to register conntrack application "
- "helper for pptp: %d\n", retcode);
- ip_ct_proto_gre_fini();
- return retcode;
- }
-
- printk("ip_conntrack_pptp version %s loaded\n", IP_CT_PPTP_VERSION);
- return 0;
-}
-
-static void __exit ip_conntrack_helper_pptp_fini(void)
-{
- ip_conntrack_helper_unregister(&pptp);
- ip_ct_proto_gre_fini();
- printk("ip_conntrack_pptp version %s unloaded\n", IP_CT_PPTP_VERSION);
-}
-
-module_init(ip_conntrack_helper_pptp_init);
-module_exit(ip_conntrack_helper_pptp_fini);
-
-EXPORT_SYMBOL(ip_nat_pptp_hook_outbound);
-EXPORT_SYMBOL(ip_nat_pptp_hook_inbound);
-EXPORT_SYMBOL(ip_nat_pptp_hook_exp_gre);
-EXPORT_SYMBOL(ip_nat_pptp_hook_expectfn);
+++ /dev/null
-/* IRC extension for IP connection tracking, Version 1.21
- * (C) 2000-2002 by Harald Welte <laforge@gnumonks.org>
- * based on RR's ip_conntrack_ftp.c
- *
- * ip_conntrack_irc.c,v 1.21 2002/02/05 14:49:26 laforge Exp
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- **
- * Module load syntax:
- * insmod ip_conntrack_irc.o ports=port1,port2,...port<MAX_PORTS>
- * max_dcc_channels=n dcc_timeout=secs
- *
- * please give the ports of all IRC servers You wish to connect to.
- * If You don't specify ports, the default will be port 6667.
- * With max_dcc_channels you can define the maximum number of not
- * yet answered DCC channels per IRC session (default 8).
- * With dcc_timeout you can specify how long the system waits for
- * an expected DCC channel (default 300 seconds).
- *
- */
-
-#include <linux/module.h>
-#include <linux/netfilter.h>
-#include <linux/ip.h>
-#include <net/checksum.h>
-#include <net/tcp.h>
-
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_irc.h>
-#include <linux/moduleparam.h>
-
-#define MAX_PORTS 8
-static unsigned short ports[MAX_PORTS];
-static int ports_c;
-static unsigned int max_dcc_channels = 8;
-static unsigned int dcc_timeout = 300;
-/* This is slow, but it's simple. --RR */
-static char *irc_buffer;
-static DEFINE_SPINLOCK(irc_buffer_lock);
-
-unsigned int (*ip_nat_irc_hook)(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- unsigned int matchoff,
- unsigned int matchlen,
- struct ip_conntrack_expect *exp);
-EXPORT_SYMBOL_GPL(ip_nat_irc_hook);
-
-MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
-MODULE_DESCRIPTION("IRC (DCC) connection tracking helper");
-MODULE_LICENSE("GPL");
-module_param_array(ports, ushort, &ports_c, 0400);
-MODULE_PARM_DESC(ports, "port numbers of IRC servers");
-module_param(max_dcc_channels, uint, 0400);
-MODULE_PARM_DESC(max_dcc_channels, "max number of expected DCC channels per IRC session");
-module_param(dcc_timeout, uint, 0400);
-MODULE_PARM_DESC(dcc_timeout, "timeout on for unestablished DCC channels");
-
-static const char *dccprotos[] = { "SEND ", "CHAT ", "MOVE ", "TSEND ", "SCHAT " };
-#define MINMATCHLEN 5
-
-#if 0
-#define DEBUGP(format, args...) printk(KERN_DEBUG "%s:%s:" format, \
- __FILE__, __FUNCTION__ , ## args)
-#else
-#define DEBUGP(format, args...)
-#endif
-
-static int parse_dcc(char *data, char *data_end, u_int32_t *ip,
- u_int16_t *port, char **ad_beg_p, char **ad_end_p)
-/* tries to get the ip_addr and port out of a dcc command
- return value: -1 on failure, 0 on success
- data pointer to first byte of DCC command data
- data_end pointer to last byte of dcc command data
- ip returns parsed ip of dcc command
- port returns parsed port of dcc command
- ad_beg_p returns pointer to first byte of addr data
- ad_end_p returns pointer to last byte of addr data */
-{
-
- /* at least 12: "AAAAAAAA P\1\n" */
- while (*data++ != ' ')
- if (data > data_end - 12)
- return -1;
-
- *ad_beg_p = data;
- *ip = simple_strtoul(data, &data, 10);
-
- /* skip blanks between ip and port */
- while (*data == ' ') {
- if (data >= data_end)
- return -1;
- data++;
- }
-
- *port = simple_strtoul(data, &data, 10);
- *ad_end_p = data;
-
- return 0;
-}
-
-static int help(struct sk_buff **pskb,
- struct ip_conntrack *ct, enum ip_conntrack_info ctinfo)
-{
- unsigned int dataoff;
- struct tcphdr _tcph, *th;
- char *data, *data_limit, *ib_ptr;
- int dir = CTINFO2DIR(ctinfo);
- struct ip_conntrack_expect *exp;
- u32 seq;
- u_int32_t dcc_ip;
- u_int16_t dcc_port;
- int i, ret = NF_ACCEPT;
- char *addr_beg_p, *addr_end_p;
- typeof(ip_nat_irc_hook) ip_nat_irc;
-
- DEBUGP("entered\n");
-
- /* If packet is coming from IRC server */
- if (dir == IP_CT_DIR_REPLY)
- return NF_ACCEPT;
-
- /* Until there's been traffic both ways, don't look in packets. */
- if (ctinfo != IP_CT_ESTABLISHED
- && ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
- DEBUGP("Conntrackinfo = %u\n", ctinfo);
- return NF_ACCEPT;
- }
-
- /* Not a full tcp header? */
- th = skb_header_pointer(*pskb, ip_hdrlen(*pskb),
- sizeof(_tcph), &_tcph);
- if (th == NULL)
- return NF_ACCEPT;
-
- /* No data? */
- dataoff = ip_hdrlen(*pskb) + th->doff * 4;
- if (dataoff >= (*pskb)->len)
- return NF_ACCEPT;
-
- spin_lock_bh(&irc_buffer_lock);
- ib_ptr = skb_header_pointer(*pskb, dataoff,
- (*pskb)->len - dataoff, irc_buffer);
- BUG_ON(ib_ptr == NULL);
-
- data = ib_ptr;
- data_limit = ib_ptr + (*pskb)->len - dataoff;
-
- /* strlen("\1DCC SENT t AAAAAAAA P\1\n")=24
- * 5+MINMATCHLEN+strlen("t AAAAAAAA P\1\n")=14 */
- while (data < (data_limit - (19 + MINMATCHLEN))) {
- if (memcmp(data, "\1DCC ", 5)) {
- data++;
- continue;
- }
-
- data += 5;
- /* we have at least (19+MINMATCHLEN)-5 bytes valid data left */
-
- DEBUGP("DCC found in master %u.%u.%u.%u:%u %u.%u.%u.%u:%u...\n",
- NIPQUAD(iph->saddr), ntohs(th->source),
- NIPQUAD(iph->daddr), ntohs(th->dest));
-
- for (i = 0; i < ARRAY_SIZE(dccprotos); i++) {
- if (memcmp(data, dccprotos[i], strlen(dccprotos[i]))) {
- /* no match */
- continue;
- }
-
- DEBUGP("DCC %s detected\n", dccprotos[i]);
- data += strlen(dccprotos[i]);
- /* we have at least
- * (19+MINMATCHLEN)-5-dccprotos[i].matchlen bytes valid
- * data left (== 14/13 bytes) */
- if (parse_dcc((char *)data, data_limit, &dcc_ip,
- &dcc_port, &addr_beg_p, &addr_end_p)) {
- /* unable to parse */
- DEBUGP("unable to parse dcc command\n");
- continue;
- }
- DEBUGP("DCC bound ip/port: %u.%u.%u.%u:%u\n",
- HIPQUAD(dcc_ip), dcc_port);
-
- /* dcc_ip can be the internal OR external (NAT'ed) IP
- * Tiago Sousa <mirage@kaotik.org> */
- if (ct->tuplehash[dir].tuple.src.ip != htonl(dcc_ip)
- && ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip != htonl(dcc_ip)) {
- if (net_ratelimit())
- printk(KERN_WARNING
- "Forged DCC command from "
- "%u.%u.%u.%u: %u.%u.%u.%u:%u\n",
- NIPQUAD(ct->tuplehash[dir].tuple.src.ip),
- HIPQUAD(dcc_ip), dcc_port);
-
- continue;
- }
-
- exp = ip_conntrack_expect_alloc(ct);
- if (exp == NULL) {
- ret = NF_DROP;
- goto out;
- }
-
- /* save position of address in dcc string,
- * necessary for NAT */
- DEBUGP("tcph->seq = %u\n", th->seq);
- seq = ntohl(th->seq) + (addr_beg_p - ib_ptr);
-
- /* We refer to the reverse direction ("!dir")
- * tuples here, because we're expecting
- * something in the other * direction.
- * Doesn't matter unless NAT is happening. */
- exp->tuple = ((struct ip_conntrack_tuple)
- { { 0, { 0 } },
- { ct->tuplehash[!dir].tuple.dst.ip,
- { .tcp = { htons(dcc_port) } },
- IPPROTO_TCP }});
- exp->mask = ((struct ip_conntrack_tuple)
- { { 0, { 0 } },
- { htonl(0xFFFFFFFF),
- { .tcp = { htons(0xFFFF) } }, 0xFF }});
- exp->expectfn = NULL;
- exp->flags = 0;
- ip_nat_irc = rcu_dereference(ip_nat_irc_hook);
- if (ip_nat_irc)
- ret = ip_nat_irc(pskb, ctinfo,
- addr_beg_p - ib_ptr,
- addr_end_p - addr_beg_p,
- exp);
- else if (ip_conntrack_expect_related(exp) != 0)
- ret = NF_DROP;
- ip_conntrack_expect_put(exp);
- goto out;
- } /* for .. NUM_DCCPROTO */
- } /* while data < ... */
-
- out:
- spin_unlock_bh(&irc_buffer_lock);
- return ret;
-}
-
-static struct ip_conntrack_helper irc_helpers[MAX_PORTS];
-static char irc_names[MAX_PORTS][sizeof("irc-65535")];
-
-static void ip_conntrack_irc_fini(void);
-
-static int __init ip_conntrack_irc_init(void)
-{
- int i, ret;
- struct ip_conntrack_helper *hlpr;
- char *tmpname;
-
- if (max_dcc_channels < 1) {
- printk("ip_conntrack_irc: max_dcc_channels must be a positive integer\n");
- return -EBUSY;
- }
-
- irc_buffer = kmalloc(65536, GFP_KERNEL);
- if (!irc_buffer)
- return -ENOMEM;
-
- /* If no port given, default to standard irc port */
- if (ports_c == 0)
- ports[ports_c++] = IRC_PORT;
-
- for (i = 0; i < ports_c; i++) {
- hlpr = &irc_helpers[i];
- hlpr->tuple.src.u.tcp.port = htons(ports[i]);
- hlpr->tuple.dst.protonum = IPPROTO_TCP;
- hlpr->mask.src.u.tcp.port = htons(0xFFFF);
- hlpr->mask.dst.protonum = 0xFF;
- hlpr->max_expected = max_dcc_channels;
- hlpr->timeout = dcc_timeout;
- hlpr->me = THIS_MODULE;
- hlpr->help = help;
-
- tmpname = &irc_names[i][0];
- if (ports[i] == IRC_PORT)
- sprintf(tmpname, "irc");
- else
- sprintf(tmpname, "irc-%d", i);
- hlpr->name = tmpname;
-
- DEBUGP("port #%d: %d\n", i, ports[i]);
-
- ret = ip_conntrack_helper_register(hlpr);
-
- if (ret) {
- printk("ip_conntrack_irc: ERROR registering port %d\n",
- ports[i]);
- ip_conntrack_irc_fini();
- return -EBUSY;
- }
- }
- return 0;
-}
-
-/* This function is intentionally _NOT_ defined as __exit, because
- * it is needed by the init function */
-static void ip_conntrack_irc_fini(void)
-{
- int i;
- for (i = 0; i < ports_c; i++) {
- DEBUGP("unregistering port %d\n",
- ports[i]);
- ip_conntrack_helper_unregister(&irc_helpers[i]);
- }
- kfree(irc_buffer);
-}
-
-module_init(ip_conntrack_irc_init);
-module_exit(ip_conntrack_irc_fini);
+++ /dev/null
-/*
- * NetBIOS name service broadcast connection tracking helper
- *
- * (c) 2005 Patrick McHardy <kaber@trash.net>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-/*
- * This helper tracks locally originating NetBIOS name service
- * requests by issuing permanent expectations (valid until
- * timing out) matching all reply connections from the
- * destination network. The only NetBIOS specific thing is
- * actually the port number.
- */
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/skbuff.h>
-#include <linux/netdevice.h>
-#include <linux/inetdevice.h>
-#include <linux/if_addr.h>
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <net/route.h>
-
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-
-#define NMBD_PORT 137
-
-MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
-MODULE_DESCRIPTION("NetBIOS name service broadcast connection tracking helper");
-MODULE_LICENSE("GPL");
-
-static unsigned int timeout = 3;
-module_param(timeout, uint, 0400);
-MODULE_PARM_DESC(timeout, "timeout for master connection/replies in seconds");
-
-static int help(struct sk_buff **pskb,
- struct ip_conntrack *ct, enum ip_conntrack_info ctinfo)
-{
- struct ip_conntrack_expect *exp;
- struct iphdr *iph = ip_hdr(*pskb);
- struct rtable *rt = (struct rtable *)(*pskb)->dst;
- struct in_device *in_dev;
- __be32 mask = 0;
-
- /* we're only interested in locally generated packets */
- if ((*pskb)->sk == NULL)
- goto out;
- if (rt == NULL || !(rt->rt_flags & RTCF_BROADCAST))
- goto out;
- if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL)
- goto out;
-
- rcu_read_lock();
- in_dev = __in_dev_get_rcu(rt->u.dst.dev);
- if (in_dev != NULL) {
- for_primary_ifa(in_dev) {
- if (ifa->ifa_broadcast == iph->daddr) {
- mask = ifa->ifa_mask;
- break;
- }
- } endfor_ifa(in_dev);
- }
- rcu_read_unlock();
-
- if (mask == 0)
- goto out;
-
- exp = ip_conntrack_expect_alloc(ct);
- if (exp == NULL)
- goto out;
-
- exp->tuple = ct->tuplehash[IP_CT_DIR_REPLY].tuple;
- exp->tuple.src.u.udp.port = htons(NMBD_PORT);
-
- exp->mask.src.ip = mask;
- exp->mask.src.u.udp.port = htons(0xFFFF);
- exp->mask.dst.ip = htonl(0xFFFFFFFF);
- exp->mask.dst.u.udp.port = htons(0xFFFF);
- exp->mask.dst.protonum = 0xFF;
-
- exp->expectfn = NULL;
- exp->flags = IP_CT_EXPECT_PERMANENT;
-
- ip_conntrack_expect_related(exp);
- ip_conntrack_expect_put(exp);
-
- ip_ct_refresh(ct, *pskb, timeout * HZ);
-out:
- return NF_ACCEPT;
-}
-
-static struct ip_conntrack_helper helper = {
- .name = "netbios-ns",
- .tuple = {
- .src = {
- .u = {
- .udp = {
- .port = __constant_htons(NMBD_PORT),
- }
- }
- },
- .dst = {
- .protonum = IPPROTO_UDP,
- },
- },
- .mask = {
- .src = {
- .u = {
- .udp = {
- .port = __constant_htons(0xFFFF),
- }
- }
- },
- .dst = {
- .protonum = 0xFF,
- },
- },
- .max_expected = 1,
- .me = THIS_MODULE,
- .help = help,
-};
-
-static int __init ip_conntrack_netbios_ns_init(void)
-{
- helper.timeout = timeout;
- return ip_conntrack_helper_register(&helper);
-}
-
-static void __exit ip_conntrack_netbios_ns_fini(void)
-{
- ip_conntrack_helper_unregister(&helper);
-}
-
-module_init(ip_conntrack_netbios_ns_init);
-module_exit(ip_conntrack_netbios_ns_fini);
+++ /dev/null
-/* Connection tracking via netlink socket. Allows for user space
- * protocol helpers and general trouble making from userspace.
- *
- * (C) 2001 by Jay Schulist <jschlst@samba.org>
- * (C) 2002-2005 by Harald Welte <laforge@gnumonks.org>
- * (C) 2003 by Patrick Mchardy <kaber@trash.net>
- * (C) 2005-2006 by Pablo Neira Ayuso <pablo@eurodev.net>
- *
- * I've reworked this stuff to use attributes instead of conntrack
- * structures. 5.44 am. I need more tea. --pablo 05/07/11.
- *
- * Initial connection tracking via netlink development funded and
- * generally made possible by Network Robots, Inc. (www.networkrobots.com)
- *
- * Further development of this code funded by Astaro AG (http://www.astaro.com)
- *
- * This software may be used and distributed according to the terms
- * of the GNU General Public License, incorporated herein by reference.
- */
-
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/timer.h>
-#include <linux/skbuff.h>
-#include <linux/errno.h>
-#include <linux/netlink.h>
-#include <linux/spinlock.h>
-#include <linux/interrupt.h>
-#include <linux/notifier.h>
-
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_conntrack_core.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
-#include <linux/netfilter_ipv4/ip_nat_protocol.h>
-
-#include <linux/netfilter/nfnetlink.h>
-#include <linux/netfilter/nfnetlink_conntrack.h>
-
-MODULE_LICENSE("GPL");
-
-static char __initdata version[] = "0.90";
-
-static inline int
-ctnetlink_dump_tuples_proto(struct sk_buff *skb,
- const struct ip_conntrack_tuple *tuple,
- struct ip_conntrack_protocol *proto)
-{
- int ret = 0;
- struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
-
- NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
-
- if (likely(proto->tuple_to_nfattr))
- ret = proto->tuple_to_nfattr(skb, tuple);
-
- NFA_NEST_END(skb, nest_parms);
-
- return ret;
-
-nfattr_failure:
- return -1;
-}
-
-static inline int
-ctnetlink_dump_tuples_ip(struct sk_buff *skb,
- const struct ip_conntrack_tuple *tuple)
-{
- struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
-
- NFA_PUT(skb, CTA_IP_V4_SRC, sizeof(__be32), &tuple->src.ip);
- NFA_PUT(skb, CTA_IP_V4_DST, sizeof(__be32), &tuple->dst.ip);
-
- NFA_NEST_END(skb, nest_parms);
-
- return 0;
-
-nfattr_failure:
- return -1;
-}
-
-static inline int
-ctnetlink_dump_tuples(struct sk_buff *skb,
- const struct ip_conntrack_tuple *tuple)
-{
- int ret;
- struct ip_conntrack_protocol *proto;
-
- ret = ctnetlink_dump_tuples_ip(skb, tuple);
- if (unlikely(ret < 0))
- return ret;
-
- proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
- ret = ctnetlink_dump_tuples_proto(skb, tuple, proto);
- ip_conntrack_proto_put(proto);
-
- return ret;
-}
-
-static inline int
-ctnetlink_dump_status(struct sk_buff *skb, const struct ip_conntrack *ct)
-{
- __be32 status = htonl((u_int32_t) ct->status);
- NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
- return 0;
-
-nfattr_failure:
- return -1;
-}
-
-static inline int
-ctnetlink_dump_timeout(struct sk_buff *skb, const struct ip_conntrack *ct)
-{
- long timeout_l = ct->timeout.expires - jiffies;
- __be32 timeout;
-
- if (timeout_l < 0)
- timeout = 0;
- else
- timeout = htonl(timeout_l / HZ);
-
- NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
- return 0;
-
-nfattr_failure:
- return -1;
-}
-
-static inline int
-ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
-{
- struct ip_conntrack_protocol *proto = ip_conntrack_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
-
- struct nfattr *nest_proto;
- int ret;
-
- if (!proto->to_nfattr) {
- ip_conntrack_proto_put(proto);
- return 0;
- }
-
- nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
-
- ret = proto->to_nfattr(skb, nest_proto, ct);
-
- ip_conntrack_proto_put(proto);
-
- NFA_NEST_END(skb, nest_proto);
-
- return ret;
-
-nfattr_failure:
- ip_conntrack_proto_put(proto);
- return -1;
-}
-
-static inline int
-ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
-{
- struct nfattr *nest_helper;
-
- if (!ct->helper)
- return 0;
-
- nest_helper = NFA_NEST(skb, CTA_HELP);
- NFA_PUT(skb, CTA_HELP_NAME, strlen(ct->helper->name), ct->helper->name);
-
- if (ct->helper->to_nfattr)
- ct->helper->to_nfattr(skb, ct);
-
- NFA_NEST_END(skb, nest_helper);
-
- return 0;
-
-nfattr_failure:
- return -1;
-}
-
-#ifdef CONFIG_IP_NF_CT_ACCT
-static inline int
-ctnetlink_dump_counters(struct sk_buff *skb, const struct ip_conntrack *ct,
- enum ip_conntrack_dir dir)
-{
- enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
- struct nfattr *nest_count = NFA_NEST(skb, type);
- __be32 tmp;
-
- tmp = htonl(ct->counters[dir].packets);
- NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(__be32), &tmp);
-
- tmp = htonl(ct->counters[dir].bytes);
- NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(__be32), &tmp);
-
- NFA_NEST_END(skb, nest_count);
-
- return 0;
-
-nfattr_failure:
- return -1;
-}
-#else
-#define ctnetlink_dump_counters(a, b, c) (0)
-#endif
-
-#ifdef CONFIG_IP_NF_CONNTRACK_MARK
-static inline int
-ctnetlink_dump_mark(struct sk_buff *skb, const struct ip_conntrack *ct)
-{
- __be32 mark = htonl(ct->mark);
-
- NFA_PUT(skb, CTA_MARK, sizeof(__be32), &mark);
- return 0;
-
-nfattr_failure:
- return -1;
-}
-#else
-#define ctnetlink_dump_mark(a, b) (0)
-#endif
-
-static inline int
-ctnetlink_dump_id(struct sk_buff *skb, const struct ip_conntrack *ct)
-{
- __be32 id = htonl(ct->id);
- NFA_PUT(skb, CTA_ID, sizeof(__be32), &id);
- return 0;
-
-nfattr_failure:
- return -1;
-}
-
-static inline int
-ctnetlink_dump_use(struct sk_buff *skb, const struct ip_conntrack *ct)
-{
- __be32 use = htonl(atomic_read(&ct->ct_general.use));
-
- NFA_PUT(skb, CTA_USE, sizeof(__be32), &use);
- return 0;
-
-nfattr_failure:
- return -1;
-}
-
-#define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
-
-static int
-ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
- int event, int nowait,
- const struct ip_conntrack *ct)
-{
- struct nlmsghdr *nlh;
- struct nfgenmsg *nfmsg;
- struct nfattr *nest_parms;
- unsigned char *b;
-
- b = skb->tail;
-
- event |= NFNL_SUBSYS_CTNETLINK << 8;
- nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
- nfmsg = NLMSG_DATA(nlh);
-
- nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
- nfmsg->nfgen_family = AF_INET;
- nfmsg->version = NFNETLINK_V0;
- nfmsg->res_id = 0;
-
- nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
- if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
- goto nfattr_failure;
- NFA_NEST_END(skb, nest_parms);
-
- nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
- if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
- goto nfattr_failure;
- NFA_NEST_END(skb, nest_parms);
-
- if (ctnetlink_dump_status(skb, ct) < 0 ||
- ctnetlink_dump_timeout(skb, ct) < 0 ||
- ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
- ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
- ctnetlink_dump_protoinfo(skb, ct) < 0 ||
- ctnetlink_dump_helpinfo(skb, ct) < 0 ||
- ctnetlink_dump_mark(skb, ct) < 0 ||
- ctnetlink_dump_id(skb, ct) < 0 ||
- ctnetlink_dump_use(skb, ct) < 0)
- goto nfattr_failure;
-
- nlh->nlmsg_len = skb->tail - b;
- return skb->len;
-
-nlmsg_failure:
-nfattr_failure:
- skb_trim(skb, b - skb->data);
- return -1;
-}
-
-#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
-static int ctnetlink_conntrack_event(struct notifier_block *this,
- unsigned long events, void *ptr)
-{
- struct nlmsghdr *nlh;
- struct nfgenmsg *nfmsg;
- struct nfattr *nest_parms;
- struct ip_conntrack *ct = (struct ip_conntrack *)ptr;
- struct sk_buff *skb;
- unsigned int type;
- unsigned char *b;
- unsigned int flags = 0, group;
-
- /* ignore our fake conntrack entry */
- if (ct == &ip_conntrack_untracked)
- return NOTIFY_DONE;
-
- if (events & IPCT_DESTROY) {
- type = IPCTNL_MSG_CT_DELETE;
- group = NFNLGRP_CONNTRACK_DESTROY;
- } else if (events & (IPCT_NEW | IPCT_RELATED)) {
- type = IPCTNL_MSG_CT_NEW;
- flags = NLM_F_CREATE|NLM_F_EXCL;
- group = NFNLGRP_CONNTRACK_NEW;
- } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
- type = IPCTNL_MSG_CT_NEW;
- group = NFNLGRP_CONNTRACK_UPDATE;
- } else
- return NOTIFY_DONE;
-
- if (!nfnetlink_has_listeners(group))
- return NOTIFY_DONE;
-
- skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
- if (!skb)
- return NOTIFY_DONE;
-
- b = skb->tail;
-
- type |= NFNL_SUBSYS_CTNETLINK << 8;
- nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
- nfmsg = NLMSG_DATA(nlh);
-
- nlh->nlmsg_flags = flags;
- nfmsg->nfgen_family = AF_INET;
- nfmsg->version = NFNETLINK_V0;
- nfmsg->res_id = 0;
-
- nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
- if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
- goto nfattr_failure;
- NFA_NEST_END(skb, nest_parms);
-
- nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
- if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
- goto nfattr_failure;
- NFA_NEST_END(skb, nest_parms);
-
- if (events & IPCT_DESTROY) {
- if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
- ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
- goto nfattr_failure;
- } else {
- if (ctnetlink_dump_status(skb, ct) < 0)
- goto nfattr_failure;
-
- if (ctnetlink_dump_timeout(skb, ct) < 0)
- goto nfattr_failure;
-
- if (events & IPCT_PROTOINFO
- && ctnetlink_dump_protoinfo(skb, ct) < 0)
- goto nfattr_failure;
-
- if ((events & IPCT_HELPER || ct->helper)
- && ctnetlink_dump_helpinfo(skb, ct) < 0)
- goto nfattr_failure;
-
-#ifdef CONFIG_IP_NF_CONNTRACK_MARK
- if ((events & IPCT_MARK || ct->mark)
- && ctnetlink_dump_mark(skb, ct) < 0)
- goto nfattr_failure;
-#endif
-
- if (events & IPCT_COUNTER_FILLING &&
- (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
- ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
- goto nfattr_failure;
- }
-
- nlh->nlmsg_len = skb->tail - b;
- nfnetlink_send(skb, 0, group, 0);
- return NOTIFY_DONE;
-
-nlmsg_failure:
-nfattr_failure:
- kfree_skb(skb);
- return NOTIFY_DONE;
-}
-#endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
-
-static int ctnetlink_done(struct netlink_callback *cb)
-{
- if (cb->args[1])
- ip_conntrack_put((struct ip_conntrack *)cb->args[1]);
- return 0;
-}
-
-static int
-ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
-{
- struct ip_conntrack *ct, *last;
- struct ip_conntrack_tuple_hash *h;
- struct list_head *i;
-
- read_lock_bh(&ip_conntrack_lock);
- last = (struct ip_conntrack *)cb->args[1];
- for (; cb->args[0] < ip_conntrack_htable_size; cb->args[0]++) {
-restart:
- list_for_each_prev(i, &ip_conntrack_hash[cb->args[0]]) {
- h = (struct ip_conntrack_tuple_hash *) i;
- if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
- continue;
- ct = tuplehash_to_ctrack(h);
- if (cb->args[1]) {
- if (ct != last)
- continue;
- cb->args[1] = 0;
- }
- if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
- cb->nlh->nlmsg_seq,
- IPCTNL_MSG_CT_NEW,
- 1, ct) < 0) {
- nf_conntrack_get(&ct->ct_general);
- cb->args[1] = (unsigned long)ct;
- goto out;
- }
-#ifdef CONFIG_NF_CT_ACCT
- if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
- IPCTNL_MSG_CT_GET_CTRZERO)
- memset(&ct->counters, 0, sizeof(ct->counters));
-#endif
- }
- if (cb->args[1]) {
- cb->args[1] = 0;
- goto restart;
- }
- }
-out:
- read_unlock_bh(&ip_conntrack_lock);
- if (last)
- ip_conntrack_put(last);
-
- return skb->len;
-}
-
-static const size_t cta_min_ip[CTA_IP_MAX] = {
- [CTA_IP_V4_SRC-1] = sizeof(__be32),
- [CTA_IP_V4_DST-1] = sizeof(__be32),
-};
-
-static inline int
-ctnetlink_parse_tuple_ip(struct nfattr *attr, struct ip_conntrack_tuple *tuple)
-{
- struct nfattr *tb[CTA_IP_MAX];
-
- nfattr_parse_nested(tb, CTA_IP_MAX, attr);
-
- if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip))
- return -EINVAL;
-
- if (!tb[CTA_IP_V4_SRC-1])
- return -EINVAL;
- tuple->src.ip = *(__be32 *)NFA_DATA(tb[CTA_IP_V4_SRC-1]);
-
- if (!tb[CTA_IP_V4_DST-1])
- return -EINVAL;
- tuple->dst.ip = *(__be32 *)NFA_DATA(tb[CTA_IP_V4_DST-1]);
-
- return 0;
-}
-
-static const size_t cta_min_proto[CTA_PROTO_MAX] = {
- [CTA_PROTO_NUM-1] = sizeof(u_int8_t),
- [CTA_PROTO_SRC_PORT-1] = sizeof(u_int16_t),
- [CTA_PROTO_DST_PORT-1] = sizeof(u_int16_t),
- [CTA_PROTO_ICMP_TYPE-1] = sizeof(u_int8_t),
- [CTA_PROTO_ICMP_CODE-1] = sizeof(u_int8_t),
- [CTA_PROTO_ICMP_ID-1] = sizeof(u_int16_t),
-};
-
-static inline int
-ctnetlink_parse_tuple_proto(struct nfattr *attr,
- struct ip_conntrack_tuple *tuple)
-{
- struct nfattr *tb[CTA_PROTO_MAX];
- struct ip_conntrack_protocol *proto;
- int ret = 0;
-
- nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
-
- if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
- return -EINVAL;
-
- if (!tb[CTA_PROTO_NUM-1])
- return -EINVAL;
- tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
-
- proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
-
- if (likely(proto->nfattr_to_tuple))
- ret = proto->nfattr_to_tuple(tb, tuple);
-
- ip_conntrack_proto_put(proto);
-
- return ret;
-}
-
-static inline int
-ctnetlink_parse_tuple(struct nfattr *cda[], struct ip_conntrack_tuple *tuple,
- enum ctattr_tuple type)
-{
- struct nfattr *tb[CTA_TUPLE_MAX];
- int err;
-
- memset(tuple, 0, sizeof(*tuple));
-
- nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
-
- if (!tb[CTA_TUPLE_IP-1])
- return -EINVAL;
-
- err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
- if (err < 0)
- return err;
-
- if (!tb[CTA_TUPLE_PROTO-1])
- return -EINVAL;
-
- err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
- if (err < 0)
- return err;
-
- /* orig and expect tuples get DIR_ORIGINAL */
- if (type == CTA_TUPLE_REPLY)
- tuple->dst.dir = IP_CT_DIR_REPLY;
- else
- tuple->dst.dir = IP_CT_DIR_ORIGINAL;
-
- return 0;
-}
-
-#ifdef CONFIG_IP_NF_NAT_NEEDED
-static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
- [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t),
- [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t),
-};
-
-static int ctnetlink_parse_nat_proto(struct nfattr *attr,
- const struct ip_conntrack *ct,
- struct ip_nat_range *range)
-{
- struct nfattr *tb[CTA_PROTONAT_MAX];
- struct ip_nat_protocol *npt;
-
- nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
-
- if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
- return -EINVAL;
-
- npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
-
- if (!npt->nfattr_to_range) {
- ip_nat_proto_put(npt);
- return 0;
- }
-
- /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
- if (npt->nfattr_to_range(tb, range) > 0)
- range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
-
- ip_nat_proto_put(npt);
-
- return 0;
-}
-
-static const size_t cta_min_nat[CTA_NAT_MAX] = {
- [CTA_NAT_MINIP-1] = sizeof(__be32),
- [CTA_NAT_MAXIP-1] = sizeof(__be32),
-};
-
-static inline int
-ctnetlink_parse_nat(struct nfattr *nat,
- const struct ip_conntrack *ct, struct ip_nat_range *range)
-{
- struct nfattr *tb[CTA_NAT_MAX];
- int err;
-
- memset(range, 0, sizeof(*range));
-
- nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
-
- if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
- return -EINVAL;
-
- if (tb[CTA_NAT_MINIP-1])
- range->min_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
-
- if (!tb[CTA_NAT_MAXIP-1])
- range->max_ip = range->min_ip;
- else
- range->max_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
-
- if (range->min_ip)
- range->flags |= IP_NAT_RANGE_MAP_IPS;
-
- if (!tb[CTA_NAT_PROTO-1])
- return 0;
-
- err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
- if (err < 0)
- return err;
-
- return 0;
-}
-#endif
-
-static inline int
-ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
-{
- struct nfattr *tb[CTA_HELP_MAX];
-
- nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
-
- if (!tb[CTA_HELP_NAME-1])
- return -EINVAL;
-
- *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
-
- return 0;
-}
-
-static const size_t cta_min[CTA_MAX] = {
- [CTA_STATUS-1] = sizeof(__be32),
- [CTA_TIMEOUT-1] = sizeof(__be32),
- [CTA_MARK-1] = sizeof(__be32),
- [CTA_USE-1] = sizeof(__be32),
- [CTA_ID-1] = sizeof(__be32)
-};
-
-static int
-ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
- struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
-{
- struct ip_conntrack_tuple_hash *h;
- struct ip_conntrack_tuple tuple;
- struct ip_conntrack *ct;
- int err = 0;
-
- if (nfattr_bad_size(cda, CTA_MAX, cta_min))
- return -EINVAL;
-
- if (cda[CTA_TUPLE_ORIG-1])
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
- else if (cda[CTA_TUPLE_REPLY-1])
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
- else {
- /* Flush the whole table */
- ip_conntrack_flush();
- return 0;
- }
-
- if (err < 0)
- return err;
-
- h = ip_conntrack_find_get(&tuple, NULL);
- if (!h)
- return -ENOENT;
-
- ct = tuplehash_to_ctrack(h);
-
- if (cda[CTA_ID-1]) {
- u_int32_t id = ntohl(*(__be32 *)NFA_DATA(cda[CTA_ID-1]));
- if (ct->id != id) {
- ip_conntrack_put(ct);
- return -ENOENT;
- }
- }
- if (del_timer(&ct->timeout))
- ct->timeout.function((unsigned long)ct);
-
- ip_conntrack_put(ct);
-
- return 0;
-}
-
-static int
-ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
- struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
-{
- struct ip_conntrack_tuple_hash *h;
- struct ip_conntrack_tuple tuple;
- struct ip_conntrack *ct;
- struct sk_buff *skb2 = NULL;
- int err = 0;
-
- if (nlh->nlmsg_flags & NLM_F_DUMP) {
- struct nfgenmsg *msg = NLMSG_DATA(nlh);
- u32 rlen;
-
- if (msg->nfgen_family != AF_INET)
- return -EAFNOSUPPORT;
-
-#ifndef CONFIG_IP_NF_CT_ACCT
- if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
- return -ENOTSUPP;
-#endif
- if ((*errp = netlink_dump_start(ctnl, skb, nlh,
- ctnetlink_dump_table,
- ctnetlink_done)) != 0)
- return -EINVAL;
-
- rlen = NLMSG_ALIGN(nlh->nlmsg_len);
- if (rlen > skb->len)
- rlen = skb->len;
- skb_pull(skb, rlen);
- return 0;
- }
-
- if (nfattr_bad_size(cda, CTA_MAX, cta_min))
- return -EINVAL;
-
- if (cda[CTA_TUPLE_ORIG-1])
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
- else if (cda[CTA_TUPLE_REPLY-1])
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
- else
- return -EINVAL;
-
- if (err < 0)
- return err;
-
- h = ip_conntrack_find_get(&tuple, NULL);
- if (!h)
- return -ENOENT;
-
- ct = tuplehash_to_ctrack(h);
-
- err = -ENOMEM;
- skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
- if (!skb2) {
- ip_conntrack_put(ct);
- return -ENOMEM;
- }
-
- err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
- IPCTNL_MSG_CT_NEW, 1, ct);
- ip_conntrack_put(ct);
- if (err <= 0)
- goto free;
-
- err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
- if (err < 0)
- goto out;
-
- return 0;
-
-free:
- kfree_skb(skb2);
-out:
- return err;
-}
-
-static inline int
-ctnetlink_change_status(struct ip_conntrack *ct, struct nfattr *cda[])
-{
- unsigned long d;
- unsigned status = ntohl(*(__be32 *)NFA_DATA(cda[CTA_STATUS-1]));
- d = ct->status ^ status;
-
- if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
- /* unchangeable */
- return -EINVAL;
-
- if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
- /* SEEN_REPLY bit can only be set */
- return -EINVAL;
-
-
- if (d & IPS_ASSURED && !(status & IPS_ASSURED))
- /* ASSURED bit can only be set */
- return -EINVAL;
-
- if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
-#ifndef CONFIG_IP_NF_NAT_NEEDED
- return -EINVAL;
-#else
- struct ip_nat_range range;
-
- if (cda[CTA_NAT_DST-1]) {
- if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
- &range) < 0)
- return -EINVAL;
- if (ip_nat_initialized(ct,
- HOOK2MANIP(NF_IP_PRE_ROUTING)))
- return -EEXIST;
- ip_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
- }
- if (cda[CTA_NAT_SRC-1]) {
- if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
- &range) < 0)
- return -EINVAL;
- if (ip_nat_initialized(ct,
- HOOK2MANIP(NF_IP_POST_ROUTING)))
- return -EEXIST;
- ip_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
- }
-#endif
- }
-
- /* Be careful here, modifying NAT bits can screw up things,
- * so don't let users modify them directly if they don't pass
- * ip_nat_range. */
- ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
- return 0;
-}
-
-
-static inline int
-ctnetlink_change_helper(struct ip_conntrack *ct, struct nfattr *cda[])
-{
- struct ip_conntrack_helper *helper;
- char *helpname;
- int err;
-
- /* don't change helper of sibling connections */
- if (ct->master)
- return -EINVAL;
-
- err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
- if (err < 0)
- return err;
-
- helper = __ip_conntrack_helper_find_byname(helpname);
- if (!helper) {
- if (!strcmp(helpname, ""))
- helper = NULL;
- else
- return -EINVAL;
- }
-
- if (ct->helper) {
- if (!helper) {
- /* we had a helper before ... */
- ip_ct_remove_expectations(ct);
- ct->helper = NULL;
- } else {
- /* need to zero data of old helper */
- memset(&ct->help, 0, sizeof(ct->help));
- }
- }
-
- ct->helper = helper;
-
- return 0;
-}
-
-static inline int
-ctnetlink_change_timeout(struct ip_conntrack *ct, struct nfattr *cda[])
-{
- u_int32_t timeout = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
-
- if (!del_timer(&ct->timeout))
- return -ETIME;
-
- ct->timeout.expires = jiffies + timeout * HZ;
- add_timer(&ct->timeout);
-
- return 0;
-}
-
-static inline int
-ctnetlink_change_protoinfo(struct ip_conntrack *ct, struct nfattr *cda[])
-{
- struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
- struct ip_conntrack_protocol *proto;
- u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
- int err = 0;
-
- nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
-
- proto = ip_conntrack_proto_find_get(npt);
-
- if (proto->from_nfattr)
- err = proto->from_nfattr(tb, ct);
- ip_conntrack_proto_put(proto);
-
- return err;
-}
-
-static int
-ctnetlink_change_conntrack(struct ip_conntrack *ct, struct nfattr *cda[])
-{
- int err;
-
- if (cda[CTA_HELP-1]) {
- err = ctnetlink_change_helper(ct, cda);
- if (err < 0)
- return err;
- }
-
- if (cda[CTA_TIMEOUT-1]) {
- err = ctnetlink_change_timeout(ct, cda);
- if (err < 0)
- return err;
- }
-
- if (cda[CTA_STATUS-1]) {
- err = ctnetlink_change_status(ct, cda);
- if (err < 0)
- return err;
- }
-
- if (cda[CTA_PROTOINFO-1]) {
- err = ctnetlink_change_protoinfo(ct, cda);
- if (err < 0)
- return err;
- }
-
-#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
- if (cda[CTA_MARK-1])
- ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
-#endif
-
- return 0;
-}
-
-static int
-ctnetlink_create_conntrack(struct nfattr *cda[],
- struct ip_conntrack_tuple *otuple,
- struct ip_conntrack_tuple *rtuple)
-{
- struct ip_conntrack *ct;
- int err = -EINVAL;
-
- ct = ip_conntrack_alloc(otuple, rtuple);
- if (ct == NULL || IS_ERR(ct))
- return -ENOMEM;
-
- if (!cda[CTA_TIMEOUT-1])
- goto err;
- ct->timeout.expires = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
-
- ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
- ct->status |= IPS_CONFIRMED;
-
- if (cda[CTA_STATUS-1]) {
- err = ctnetlink_change_status(ct, cda);
- if (err < 0)
- goto err;
- }
-
- if (cda[CTA_PROTOINFO-1]) {
- err = ctnetlink_change_protoinfo(ct, cda);
- if (err < 0)
- goto err;
- }
-
-#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
- if (cda[CTA_MARK-1])
- ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
-#endif
-
- ct->helper = ip_conntrack_helper_find_get(rtuple);
-
- add_timer(&ct->timeout);
- ip_conntrack_hash_insert(ct);
-
- if (ct->helper)
- ip_conntrack_helper_put(ct->helper);
-
- return 0;
-
-err:
- ip_conntrack_free(ct);
- return err;
-}
-
-static int
-ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
- struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
-{
- struct ip_conntrack_tuple otuple, rtuple;
- struct ip_conntrack_tuple_hash *h = NULL;
- int err = 0;
-
- if (nfattr_bad_size(cda, CTA_MAX, cta_min))
- return -EINVAL;
-
- if (cda[CTA_TUPLE_ORIG-1]) {
- err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG);
- if (err < 0)
- return err;
- }
-
- if (cda[CTA_TUPLE_REPLY-1]) {
- err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY);
- if (err < 0)
- return err;
- }
-
- write_lock_bh(&ip_conntrack_lock);
- if (cda[CTA_TUPLE_ORIG-1])
- h = __ip_conntrack_find(&otuple, NULL);
- else if (cda[CTA_TUPLE_REPLY-1])
- h = __ip_conntrack_find(&rtuple, NULL);
-
- if (h == NULL) {
- write_unlock_bh(&ip_conntrack_lock);
- err = -ENOENT;
- if (nlh->nlmsg_flags & NLM_F_CREATE)
- err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
- return err;
- }
- /* implicit 'else' */
-
- /* we only allow nat config for new conntracks */
- if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
- err = -EINVAL;
- goto out_unlock;
- }
-
- /* We manipulate the conntrack inside the global conntrack table lock,
- * so there's no need to increase the refcount */
- err = -EEXIST;
- if (!(nlh->nlmsg_flags & NLM_F_EXCL))
- err = ctnetlink_change_conntrack(tuplehash_to_ctrack(h), cda);
-
-out_unlock:
- write_unlock_bh(&ip_conntrack_lock);
- return err;
-}
-
-/***********************************************************************
- * EXPECT
- ***********************************************************************/
-
-static inline int
-ctnetlink_exp_dump_tuple(struct sk_buff *skb,
- const struct ip_conntrack_tuple *tuple,
- enum ctattr_expect type)
-{
- struct nfattr *nest_parms = NFA_NEST(skb, type);
-
- if (ctnetlink_dump_tuples(skb, tuple) < 0)
- goto nfattr_failure;
-
- NFA_NEST_END(skb, nest_parms);
-
- return 0;
-
-nfattr_failure:
- return -1;
-}
-
-static inline int
-ctnetlink_exp_dump_mask(struct sk_buff *skb,
- const struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack_tuple *mask)
-{
- int ret;
- struct ip_conntrack_protocol *proto;
- struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
-
- ret = ctnetlink_dump_tuples_ip(skb, mask);
- if (unlikely(ret < 0))
- goto nfattr_failure;
-
- proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
- ret = ctnetlink_dump_tuples_proto(skb, mask, proto);
- ip_conntrack_proto_put(proto);
- if (unlikely(ret < 0))
- goto nfattr_failure;
-
- NFA_NEST_END(skb, nest_parms);
-
- return 0;
-
-nfattr_failure:
- return -1;
-}
-
-static inline int
-ctnetlink_exp_dump_expect(struct sk_buff *skb,
- const struct ip_conntrack_expect *exp)
-{
- struct ip_conntrack *master = exp->master;
- __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
- __be32 id = htonl(exp->id);
-
- if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
- goto nfattr_failure;
- if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
- goto nfattr_failure;
- if (ctnetlink_exp_dump_tuple(skb,
- &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
- CTA_EXPECT_MASTER) < 0)
- goto nfattr_failure;
-
- NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(__be32), &timeout);
- NFA_PUT(skb, CTA_EXPECT_ID, sizeof(__be32), &id);
-
- return 0;
-
-nfattr_failure:
- return -1;
-}
-
-static int
-ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
- int event,
- int nowait,
- const struct ip_conntrack_expect *exp)
-{
- struct nlmsghdr *nlh;
- struct nfgenmsg *nfmsg;
- unsigned char *b;
-
- b = skb->tail;
-
- event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
- nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
- nfmsg = NLMSG_DATA(nlh);
-
- nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
- nfmsg->nfgen_family = AF_INET;
- nfmsg->version = NFNETLINK_V0;
- nfmsg->res_id = 0;
-
- if (ctnetlink_exp_dump_expect(skb, exp) < 0)
- goto nfattr_failure;
-
- nlh->nlmsg_len = skb->tail - b;
- return skb->len;
-
-nlmsg_failure:
-nfattr_failure:
- skb_trim(skb, b - skb->data);
- return -1;
-}
-
-#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
-static int ctnetlink_expect_event(struct notifier_block *this,
- unsigned long events, void *ptr)
-{
- struct nlmsghdr *nlh;
- struct nfgenmsg *nfmsg;
- struct ip_conntrack_expect *exp = (struct ip_conntrack_expect *)ptr;
- struct sk_buff *skb;
- unsigned int type;
- unsigned char *b;
- int flags = 0;
-
- if (events & IPEXP_NEW) {
- type = IPCTNL_MSG_EXP_NEW;
- flags = NLM_F_CREATE|NLM_F_EXCL;
- } else
- return NOTIFY_DONE;
-
- if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
- return NOTIFY_DONE;
-
- skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
- if (!skb)
- return NOTIFY_DONE;
-
- b = skb->tail;
-
- type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
- nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
- nfmsg = NLMSG_DATA(nlh);
-
- nlh->nlmsg_flags = flags;
- nfmsg->nfgen_family = AF_INET;
- nfmsg->version = NFNETLINK_V0;
- nfmsg->res_id = 0;
-
- if (ctnetlink_exp_dump_expect(skb, exp) < 0)
- goto nfattr_failure;
-
- nlh->nlmsg_len = skb->tail - b;
- nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
- return NOTIFY_DONE;
-
-nlmsg_failure:
-nfattr_failure:
- kfree_skb(skb);
- return NOTIFY_DONE;
-}
-#endif
-
-static int
-ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
-{
- struct ip_conntrack_expect *exp = NULL;
- struct list_head *i;
- u_int32_t *id = (u_int32_t *) &cb->args[0];
-
- read_lock_bh(&ip_conntrack_lock);
- list_for_each_prev(i, &ip_conntrack_expect_list) {
- exp = (struct ip_conntrack_expect *) i;
- if (exp->id <= *id)
- continue;
- if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
- cb->nlh->nlmsg_seq,
- IPCTNL_MSG_EXP_NEW,
- 1, exp) < 0)
- goto out;
- *id = exp->id;
- }
-out:
- read_unlock_bh(&ip_conntrack_lock);
-
- return skb->len;
-}
-
-static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
- [CTA_EXPECT_TIMEOUT-1] = sizeof(__be32),
- [CTA_EXPECT_ID-1] = sizeof(__be32)
-};
-
-static int
-ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
- struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
-{
- struct ip_conntrack_tuple tuple;
- struct ip_conntrack_expect *exp;
- struct sk_buff *skb2;
- int err = 0;
-
- if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
- return -EINVAL;
-
- if (nlh->nlmsg_flags & NLM_F_DUMP) {
- struct nfgenmsg *msg = NLMSG_DATA(nlh);
- u32 rlen;
-
- if (msg->nfgen_family != AF_INET)
- return -EAFNOSUPPORT;
-
- if ((*errp = netlink_dump_start(ctnl, skb, nlh,
- ctnetlink_exp_dump_table,
- ctnetlink_done)) != 0)
- return -EINVAL;
- rlen = NLMSG_ALIGN(nlh->nlmsg_len);
- if (rlen > skb->len)
- rlen = skb->len;
- skb_pull(skb, rlen);
- return 0;
- }
-
- if (cda[CTA_EXPECT_MASTER-1])
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER);
- else
- return -EINVAL;
-
- if (err < 0)
- return err;
-
- exp = ip_conntrack_expect_find_get(&tuple);
- if (!exp)
- return -ENOENT;
-
- if (cda[CTA_EXPECT_ID-1]) {
- __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
- if (exp->id != ntohl(id)) {
- ip_conntrack_expect_put(exp);
- return -ENOENT;
- }
- }
-
- err = -ENOMEM;
- skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
- if (!skb2)
- goto out;
-
- err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
- nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
- 1, exp);
- if (err <= 0)
- goto free;
-
- ip_conntrack_expect_put(exp);
-
- return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
-
-free:
- kfree_skb(skb2);
-out:
- ip_conntrack_expect_put(exp);
- return err;
-}
-
-static int
-ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
- struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
-{
- struct ip_conntrack_expect *exp, *tmp;
- struct ip_conntrack_tuple tuple;
- struct ip_conntrack_helper *h;
- int err;
-
- if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
- return -EINVAL;
-
- if (cda[CTA_EXPECT_TUPLE-1]) {
- /* delete a single expect by tuple */
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
- if (err < 0)
- return err;
-
- /* bump usage count to 2 */
- exp = ip_conntrack_expect_find_get(&tuple);
- if (!exp)
- return -ENOENT;
-
- if (cda[CTA_EXPECT_ID-1]) {
- __be32 id =
- *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
- if (exp->id != ntohl(id)) {
- ip_conntrack_expect_put(exp);
- return -ENOENT;
- }
- }
-
- /* after list removal, usage count == 1 */
- ip_conntrack_unexpect_related(exp);
- /* have to put what we 'get' above.
- * after this line usage count == 0 */
- ip_conntrack_expect_put(exp);
- } else if (cda[CTA_EXPECT_HELP_NAME-1]) {
- char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
-
- /* delete all expectations for this helper */
- write_lock_bh(&ip_conntrack_lock);
- h = __ip_conntrack_helper_find_byname(name);
- if (!h) {
- write_unlock_bh(&ip_conntrack_lock);
- return -EINVAL;
- }
- list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
- list) {
- if (exp->master->helper == h
- && del_timer(&exp->timeout)) {
- ip_ct_unlink_expect(exp);
- ip_conntrack_expect_put(exp);
- }
- }
- write_unlock_bh(&ip_conntrack_lock);
- } else {
- /* This basically means we have to flush everything*/
- write_lock_bh(&ip_conntrack_lock);
- list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
- list) {
- if (del_timer(&exp->timeout)) {
- ip_ct_unlink_expect(exp);
- ip_conntrack_expect_put(exp);
- }
- }
- write_unlock_bh(&ip_conntrack_lock);
- }
-
- return 0;
-}
-static int
-ctnetlink_change_expect(struct ip_conntrack_expect *x, struct nfattr *cda[])
-{
- return -EOPNOTSUPP;
-}
-
-static int
-ctnetlink_create_expect(struct nfattr *cda[])
-{
- struct ip_conntrack_tuple tuple, mask, master_tuple;
- struct ip_conntrack_tuple_hash *h = NULL;
- struct ip_conntrack_expect *exp;
- struct ip_conntrack *ct;
- int err = 0;
-
- /* caller guarantees that those three CTA_EXPECT_* exist */
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
- if (err < 0)
- return err;
- err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK);
- if (err < 0)
- return err;
- err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER);
- if (err < 0)
- return err;
-
- /* Look for master conntrack of this expectation */
- h = ip_conntrack_find_get(&master_tuple, NULL);
- if (!h)
- return -ENOENT;
- ct = tuplehash_to_ctrack(h);
-
- if (!ct->helper) {
- /* such conntrack hasn't got any helper, abort */
- err = -EINVAL;
- goto out;
- }
-
- exp = ip_conntrack_expect_alloc(ct);
- if (!exp) {
- err = -ENOMEM;
- goto out;
- }
-
- exp->expectfn = NULL;
- exp->flags = 0;
- exp->master = ct;
- memcpy(&exp->tuple, &tuple, sizeof(struct ip_conntrack_tuple));
- memcpy(&exp->mask, &mask, sizeof(struct ip_conntrack_tuple));
-
- err = ip_conntrack_expect_related(exp);
- ip_conntrack_expect_put(exp);
-
-out:
- ip_conntrack_put(tuplehash_to_ctrack(h));
- return err;
-}
-
-static int
-ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
- struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
-{
- struct ip_conntrack_tuple tuple;
- struct ip_conntrack_expect *exp;
- int err = 0;
-
- if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
- return -EINVAL;
-
- if (!cda[CTA_EXPECT_TUPLE-1]
- || !cda[CTA_EXPECT_MASK-1]
- || !cda[CTA_EXPECT_MASTER-1])
- return -EINVAL;
-
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
- if (err < 0)
- return err;
-
- write_lock_bh(&ip_conntrack_lock);
- exp = __ip_conntrack_expect_find(&tuple);
-
- if (!exp) {
- write_unlock_bh(&ip_conntrack_lock);
- err = -ENOENT;
- if (nlh->nlmsg_flags & NLM_F_CREATE)
- err = ctnetlink_create_expect(cda);
- return err;
- }
-
- err = -EEXIST;
- if (!(nlh->nlmsg_flags & NLM_F_EXCL))
- err = ctnetlink_change_expect(exp, cda);
- write_unlock_bh(&ip_conntrack_lock);
-
- return err;
-}
-
-#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
-static struct notifier_block ctnl_notifier = {
- .notifier_call = ctnetlink_conntrack_event,
-};
-
-static struct notifier_block ctnl_notifier_exp = {
- .notifier_call = ctnetlink_expect_event,
-};
-#endif
-
-static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
- [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
- .attr_count = CTA_MAX, },
- [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
- .attr_count = CTA_MAX, },
- [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
- .attr_count = CTA_MAX, },
- [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
- .attr_count = CTA_MAX, },
-};
-
-static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
- [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
- .attr_count = CTA_EXPECT_MAX, },
- [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
- .attr_count = CTA_EXPECT_MAX, },
- [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
- .attr_count = CTA_EXPECT_MAX, },
-};
-
-static struct nfnetlink_subsystem ctnl_subsys = {
- .name = "conntrack",
- .subsys_id = NFNL_SUBSYS_CTNETLINK,
- .cb_count = IPCTNL_MSG_MAX,
- .cb = ctnl_cb,
-};
-
-static struct nfnetlink_subsystem ctnl_exp_subsys = {
- .name = "conntrack_expect",
- .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
- .cb_count = IPCTNL_MSG_EXP_MAX,
- .cb = ctnl_exp_cb,
-};
-
-MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
-MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
-
-static int __init ctnetlink_init(void)
-{
- int ret;
-
- printk("ctnetlink v%s: registering with nfnetlink.\n", version);
- ret = nfnetlink_subsys_register(&ctnl_subsys);
- if (ret < 0) {
- printk("ctnetlink_init: cannot register with nfnetlink.\n");
- goto err_out;
- }
-
- ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
- if (ret < 0) {
- printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
- goto err_unreg_subsys;
- }
-
-#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
- ret = ip_conntrack_register_notifier(&ctnl_notifier);
- if (ret < 0) {
- printk("ctnetlink_init: cannot register notifier.\n");
- goto err_unreg_exp_subsys;
- }
-
- ret = ip_conntrack_expect_register_notifier(&ctnl_notifier_exp);
- if (ret < 0) {
- printk("ctnetlink_init: cannot expect register notifier.\n");
- goto err_unreg_notifier;
- }
-#endif
-
- return 0;
-
-#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
-err_unreg_notifier:
- ip_conntrack_unregister_notifier(&ctnl_notifier);
-err_unreg_exp_subsys:
- nfnetlink_subsys_unregister(&ctnl_exp_subsys);
-#endif
-err_unreg_subsys:
- nfnetlink_subsys_unregister(&ctnl_subsys);
-err_out:
- return ret;
-}
-
-static void __exit ctnetlink_exit(void)
-{
- printk("ctnetlink: unregistering from nfnetlink.\n");
-
-#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
- ip_conntrack_expect_unregister_notifier(&ctnl_notifier_exp);
- ip_conntrack_unregister_notifier(&ctnl_notifier);
-#endif
-
- nfnetlink_subsys_unregister(&ctnl_exp_subsys);
- nfnetlink_subsys_unregister(&ctnl_subsys);
- return;
-}
-
-module_init(ctnetlink_init);
-module_exit(ctnetlink_exit);
+++ /dev/null
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/types.h>
-#include <linux/timer.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
-
-unsigned int ip_ct_generic_timeout __read_mostly = 600*HZ;
-
-static int generic_pkt_to_tuple(const struct sk_buff *skb,
- unsigned int dataoff,
- struct ip_conntrack_tuple *tuple)
-{
- tuple->src.u.all = 0;
- tuple->dst.u.all = 0;
-
- return 1;
-}
-
-static int generic_invert_tuple(struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack_tuple *orig)
-{
- tuple->src.u.all = 0;
- tuple->dst.u.all = 0;
-
- return 1;
-}
-
-/* Print out the per-protocol part of the tuple. */
-static int generic_print_tuple(struct seq_file *s,
- const struct ip_conntrack_tuple *tuple)
-{
- return 0;
-}
-
-/* Print out the private part of the conntrack. */
-static int generic_print_conntrack(struct seq_file *s,
- const struct ip_conntrack *state)
-{
- return 0;
-}
-
-/* Returns verdict for packet, or -1 for invalid. */
-static int packet(struct ip_conntrack *conntrack,
- const struct sk_buff *skb,
- enum ip_conntrack_info ctinfo)
-{
- ip_ct_refresh_acct(conntrack, ctinfo, skb, ip_ct_generic_timeout);
- return NF_ACCEPT;
-}
-
-/* Called when a new connection for this protocol found. */
-static int new(struct ip_conntrack *conntrack, const struct sk_buff *skb)
-{
- return 1;
-}
-
-struct ip_conntrack_protocol ip_conntrack_generic_protocol =
-{
- .proto = 0,
- .name = "unknown",
- .pkt_to_tuple = generic_pkt_to_tuple,
- .invert_tuple = generic_invert_tuple,
- .print_tuple = generic_print_tuple,
- .print_conntrack = generic_print_conntrack,
- .packet = packet,
- .new = new,
-};
+++ /dev/null
-/*
- * ip_conntrack_proto_gre.c - Version 3.0
- *
- * Connection tracking protocol helper module for GRE.
- *
- * GRE is a generic encapsulation protocol, which is generally not very
- * suited for NAT, as it has no protocol-specific part as port numbers.
- *
- * It has an optional key field, which may help us distinguishing two
- * connections between the same two hosts.
- *
- * GRE is defined in RFC 1701 and RFC 1702, as well as RFC 2784
- *
- * PPTP is built on top of a modified version of GRE, and has a mandatory
- * field called "CallID", which serves us for the same purpose as the key
- * field in plain GRE.
- *
- * Documentation about PPTP can be found in RFC 2637
- *
- * (C) 2000-2005 by Harald Welte <laforge@gnumonks.org>
- *
- * Development of this code funded by Astaro AG (http://www.astaro.com/)
- *
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/timer.h>
-#include <linux/netfilter.h>
-#include <linux/ip.h>
-#include <linux/in.h>
-#include <linux/list.h>
-#include <linux/seq_file.h>
-#include <linux/interrupt.h>
-
-static DEFINE_RWLOCK(ip_ct_gre_lock);
-
-#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_core.h>
-
-#include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h>
-#include <linux/netfilter_ipv4/ip_conntrack_pptp.h>
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
-MODULE_DESCRIPTION("netfilter connection tracking protocol helper for GRE");
-
-/* shamelessly stolen from ip_conntrack_proto_udp.c */
-#define GRE_TIMEOUT (30*HZ)
-#define GRE_STREAM_TIMEOUT (180*HZ)
-
-#if 0
-#define DEBUGP(format, args...) printk(KERN_DEBUG "%s:%s: " format, __FILE__, __FUNCTION__, ## args)
-#define DUMP_TUPLE_GRE(x) printk("%u.%u.%u.%u:0x%x -> %u.%u.%u.%u:0x%x\n", \
- NIPQUAD((x)->src.ip), ntohs((x)->src.u.gre.key), \
- NIPQUAD((x)->dst.ip), ntohs((x)->dst.u.gre.key))
-#else
-#define DEBUGP(x, args...)
-#define DUMP_TUPLE_GRE(x)
-#endif
-
-/* GRE KEYMAP HANDLING FUNCTIONS */
-static LIST_HEAD(gre_keymap_list);
-
-static inline int gre_key_cmpfn(const struct ip_ct_gre_keymap *km,
- const struct ip_conntrack_tuple *t)
-{
- return ((km->tuple.src.ip == t->src.ip) &&
- (km->tuple.dst.ip == t->dst.ip) &&
- (km->tuple.dst.protonum == t->dst.protonum) &&
- (km->tuple.dst.u.all == t->dst.u.all));
-}
-
-/* look up the source key for a given tuple */
-static __be16 gre_keymap_lookup(struct ip_conntrack_tuple *t)
-{
- struct ip_ct_gre_keymap *km;
- __be16 key = 0;
-
- read_lock_bh(&ip_ct_gre_lock);
- list_for_each_entry(km, &gre_keymap_list, list) {
- if (gre_key_cmpfn(km, t)) {
- key = km->tuple.src.u.gre.key;
- break;
- }
- }
- read_unlock_bh(&ip_ct_gre_lock);
-
- DEBUGP("lookup src key 0x%x up key for ", key);
- DUMP_TUPLE_GRE(t);
-
- return key;
-}
-
-/* add a single keymap entry, associate with specified master ct */
-int
-ip_ct_gre_keymap_add(struct ip_conntrack *ct,
- struct ip_conntrack_tuple *t, int reply)
-{
- struct ip_ct_gre_keymap **exist_km, *km;
-
- if (!ct->helper || strcmp(ct->helper->name, "pptp")) {
- DEBUGP("refusing to add GRE keymap to non-pptp session\n");
- return -1;
- }
-
- if (!reply)
- exist_km = &ct->help.ct_pptp_info.keymap_orig;
- else
- exist_km = &ct->help.ct_pptp_info.keymap_reply;
-
- if (*exist_km) {
- /* check whether it's a retransmission */
- list_for_each_entry(km, &gre_keymap_list, list) {
- if (gre_key_cmpfn(km, t) && km == *exist_km)
- return 0;
- }
- DEBUGP("trying to override keymap_%s for ct %p\n",
- reply? "reply":"orig", ct);
- return -EEXIST;
- }
-
- km = kmalloc(sizeof(*km), GFP_ATOMIC);
- if (!km)
- return -ENOMEM;
-
- memcpy(&km->tuple, t, sizeof(*t));
- *exist_km = km;
-
- DEBUGP("adding new entry %p: ", km);
- DUMP_TUPLE_GRE(&km->tuple);
-
- write_lock_bh(&ip_ct_gre_lock);
- list_add_tail(&km->list, &gre_keymap_list);
- write_unlock_bh(&ip_ct_gre_lock);
-
- return 0;
-}
-
-/* destroy the keymap entries associated with specified master ct */
-void ip_ct_gre_keymap_destroy(struct ip_conntrack *ct)
-{
- DEBUGP("entering for ct %p\n", ct);
-
- if (!ct->helper || strcmp(ct->helper->name, "pptp")) {
- DEBUGP("refusing to destroy GRE keymap to non-pptp session\n");
- return;
- }
-
- write_lock_bh(&ip_ct_gre_lock);
- if (ct->help.ct_pptp_info.keymap_orig) {
- DEBUGP("removing %p from list\n",
- ct->help.ct_pptp_info.keymap_orig);
- list_del(&ct->help.ct_pptp_info.keymap_orig->list);
- kfree(ct->help.ct_pptp_info.keymap_orig);
- ct->help.ct_pptp_info.keymap_orig = NULL;
- }
- if (ct->help.ct_pptp_info.keymap_reply) {
- DEBUGP("removing %p from list\n",
- ct->help.ct_pptp_info.keymap_reply);
- list_del(&ct->help.ct_pptp_info.keymap_reply->list);
- kfree(ct->help.ct_pptp_info.keymap_reply);
- ct->help.ct_pptp_info.keymap_reply = NULL;
- }
- write_unlock_bh(&ip_ct_gre_lock);
-}
-
-
-/* PUBLIC CONNTRACK PROTO HELPER FUNCTIONS */
-
-/* invert gre part of tuple */
-static int gre_invert_tuple(struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack_tuple *orig)
-{
- tuple->dst.u.gre.key = orig->src.u.gre.key;
- tuple->src.u.gre.key = orig->dst.u.gre.key;
-
- return 1;
-}
-
-/* gre hdr info to tuple */
-static int gre_pkt_to_tuple(const struct sk_buff *skb,
- unsigned int dataoff,
- struct ip_conntrack_tuple *tuple)
-{
- struct gre_hdr_pptp _pgrehdr, *pgrehdr;
- __be16 srckey;
- struct gre_hdr _grehdr, *grehdr;
-
- /* first only delinearize old RFC1701 GRE header */
- grehdr = skb_header_pointer(skb, dataoff, sizeof(_grehdr), &_grehdr);
- if (!grehdr || grehdr->version != GRE_VERSION_PPTP) {
- /* try to behave like "ip_conntrack_proto_generic" */
- tuple->src.u.all = 0;
- tuple->dst.u.all = 0;
- return 1;
- }
-
- /* PPTP header is variable length, only need up to the call_id field */
- pgrehdr = skb_header_pointer(skb, dataoff, 8, &_pgrehdr);
- if (!pgrehdr)
- return 1;
-
- if (ntohs(grehdr->protocol) != GRE_PROTOCOL_PPTP) {
- DEBUGP("GRE_VERSION_PPTP but unknown proto\n");
- return 0;
- }
-
- tuple->dst.u.gre.key = pgrehdr->call_id;
- srckey = gre_keymap_lookup(tuple);
- tuple->src.u.gre.key = srckey;
-
- return 1;
-}
-
-/* print gre part of tuple */
-static int gre_print_tuple(struct seq_file *s,
- const struct ip_conntrack_tuple *tuple)
-{
- return seq_printf(s, "srckey=0x%x dstkey=0x%x ",
- ntohs(tuple->src.u.gre.key),
- ntohs(tuple->dst.u.gre.key));
-}
-
-/* print private data for conntrack */
-static int gre_print_conntrack(struct seq_file *s,
- const struct ip_conntrack *ct)
-{
- return seq_printf(s, "timeout=%u, stream_timeout=%u ",
- (ct->proto.gre.timeout / HZ),
- (ct->proto.gre.stream_timeout / HZ));
-}
-
-/* Returns verdict for packet, and may modify conntrack */
-static int gre_packet(struct ip_conntrack *ct,
- const struct sk_buff *skb,
- enum ip_conntrack_info conntrackinfo)
-{
- /* If we've seen traffic both ways, this is a GRE connection.
- * Extend timeout. */
- if (ct->status & IPS_SEEN_REPLY) {
- ip_ct_refresh_acct(ct, conntrackinfo, skb,
- ct->proto.gre.stream_timeout);
- /* Also, more likely to be important, and not a probe. */
- set_bit(IPS_ASSURED_BIT, &ct->status);
- ip_conntrack_event_cache(IPCT_STATUS, skb);
- } else
- ip_ct_refresh_acct(ct, conntrackinfo, skb,
- ct->proto.gre.timeout);
-
- return NF_ACCEPT;
-}
-
-/* Called when a new connection for this protocol found. */
-static int gre_new(struct ip_conntrack *ct,
- const struct sk_buff *skb)
-{
- DEBUGP(": ");
- DUMP_TUPLE_GRE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
-
- /* initialize to sane value. Ideally a conntrack helper
- * (e.g. in case of pptp) is increasing them */
- ct->proto.gre.stream_timeout = GRE_STREAM_TIMEOUT;
- ct->proto.gre.timeout = GRE_TIMEOUT;
-
- return 1;
-}
-
-/* Called when a conntrack entry has already been removed from the hashes
- * and is about to be deleted from memory */
-static void gre_destroy(struct ip_conntrack *ct)
-{
- struct ip_conntrack *master = ct->master;
- DEBUGP(" entering\n");
-
- if (!master)
- DEBUGP("no master !?!\n");
- else
- ip_ct_gre_keymap_destroy(master);
-}
-
-/* protocol helper struct */
-static struct ip_conntrack_protocol gre = {
- .proto = IPPROTO_GRE,
- .name = "gre",
- .pkt_to_tuple = gre_pkt_to_tuple,
- .invert_tuple = gre_invert_tuple,
- .print_tuple = gre_print_tuple,
- .print_conntrack = gre_print_conntrack,
- .packet = gre_packet,
- .new = gre_new,
- .destroy = gre_destroy,
- .me = THIS_MODULE,
-#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
- defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
- .tuple_to_nfattr = ip_ct_port_tuple_to_nfattr,
- .nfattr_to_tuple = ip_ct_port_nfattr_to_tuple,
-#endif
-};
-
-/* ip_conntrack_proto_gre initialization */
-int __init ip_ct_proto_gre_init(void)
-{
- return ip_conntrack_protocol_register(&gre);
-}
-
-/* This cannot be __exit, as it is invoked from ip_conntrack_helper_pptp.c's
- * init() code on errors.
- */
-void ip_ct_proto_gre_fini(void)
-{
- struct list_head *pos, *n;
-
- /* delete all keymap entries */
- write_lock_bh(&ip_ct_gre_lock);
- list_for_each_safe(pos, n, &gre_keymap_list) {
- DEBUGP("deleting keymap %p at module unload time\n", pos);
- list_del(pos);
- kfree(pos);
- }
- write_unlock_bh(&ip_ct_gre_lock);
-
- ip_conntrack_protocol_unregister(&gre);
-}
-
-EXPORT_SYMBOL(ip_ct_gre_keymap_add);
-EXPORT_SYMBOL(ip_ct_gre_keymap_destroy);
+++ /dev/null
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/types.h>
-#include <linux/timer.h>
-#include <linux/netfilter.h>
-#include <linux/in.h>
-#include <linux/icmp.h>
-#include <linux/seq_file.h>
-#include <linux/skbuff.h>
-#include <net/ip.h>
-#include <net/checksum.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_conntrack_core.h>
-#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
-
-unsigned int ip_ct_icmp_timeout __read_mostly = 30*HZ;
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-static int icmp_pkt_to_tuple(const struct sk_buff *skb,
- unsigned int dataoff,
- struct ip_conntrack_tuple *tuple)
-{
- struct icmphdr _hdr, *hp;
-
- hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
- if (hp == NULL)
- return 0;
-
- tuple->dst.u.icmp.type = hp->type;
- tuple->src.u.icmp.id = hp->un.echo.id;
- tuple->dst.u.icmp.code = hp->code;
-
- return 1;
-}
-
-/* Add 1; spaces filled with 0. */
-static const u_int8_t invmap[] = {
- [ICMP_ECHO] = ICMP_ECHOREPLY + 1,
- [ICMP_ECHOREPLY] = ICMP_ECHO + 1,
- [ICMP_TIMESTAMP] = ICMP_TIMESTAMPREPLY + 1,
- [ICMP_TIMESTAMPREPLY] = ICMP_TIMESTAMP + 1,
- [ICMP_INFO_REQUEST] = ICMP_INFO_REPLY + 1,
- [ICMP_INFO_REPLY] = ICMP_INFO_REQUEST + 1,
- [ICMP_ADDRESS] = ICMP_ADDRESSREPLY + 1,
- [ICMP_ADDRESSREPLY] = ICMP_ADDRESS + 1
-};
-
-static int icmp_invert_tuple(struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack_tuple *orig)
-{
- if (orig->dst.u.icmp.type >= sizeof(invmap)
- || !invmap[orig->dst.u.icmp.type])
- return 0;
-
- tuple->src.u.icmp.id = orig->src.u.icmp.id;
- tuple->dst.u.icmp.type = invmap[orig->dst.u.icmp.type] - 1;
- tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
- return 1;
-}
-
-/* Print out the per-protocol part of the tuple. */
-static int icmp_print_tuple(struct seq_file *s,
- const struct ip_conntrack_tuple *tuple)
-{
- return seq_printf(s, "type=%u code=%u id=%u ",
- tuple->dst.u.icmp.type,
- tuple->dst.u.icmp.code,
- ntohs(tuple->src.u.icmp.id));
-}
-
-/* Print out the private part of the conntrack. */
-static int icmp_print_conntrack(struct seq_file *s,
- const struct ip_conntrack *conntrack)
-{
- return 0;
-}
-
-/* Returns verdict for packet, or -1 for invalid. */
-static int icmp_packet(struct ip_conntrack *ct,
- const struct sk_buff *skb,
- enum ip_conntrack_info ctinfo)
-{
- /* Try to delete connection immediately after all replies:
- won't actually vanish as we still have skb, and del_timer
- means this will only run once even if count hits zero twice
- (theoretically possible with SMP) */
- if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
- if (atomic_dec_and_test(&ct->proto.icmp.count)
- && del_timer(&ct->timeout))
- ct->timeout.function((unsigned long)ct);
- } else {
- atomic_inc(&ct->proto.icmp.count);
- ip_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);
- ip_ct_refresh_acct(ct, ctinfo, skb, ip_ct_icmp_timeout);
- }
-
- return NF_ACCEPT;
-}
-
-/* Called when a new connection for this protocol found. */
-static int icmp_new(struct ip_conntrack *conntrack,
- const struct sk_buff *skb)
-{
- static const u_int8_t valid_new[] = {
- [ICMP_ECHO] = 1,
- [ICMP_TIMESTAMP] = 1,
- [ICMP_INFO_REQUEST] = 1,
- [ICMP_ADDRESS] = 1
- };
-
- if (conntrack->tuplehash[0].tuple.dst.u.icmp.type >= sizeof(valid_new)
- || !valid_new[conntrack->tuplehash[0].tuple.dst.u.icmp.type]) {
- /* Can't create a new ICMP `conn' with this. */
- DEBUGP("icmp: can't create new conn with type %u\n",
- conntrack->tuplehash[0].tuple.dst.u.icmp.type);
- DUMP_TUPLE(&conntrack->tuplehash[0].tuple);
- return 0;
- }
- atomic_set(&conntrack->proto.icmp.count, 0);
- return 1;
-}
-
-static int
-icmp_error_message(struct sk_buff *skb,
- enum ip_conntrack_info *ctinfo,
- unsigned int hooknum)
-{
- struct ip_conntrack_tuple innertuple, origtuple;
- struct {
- struct icmphdr icmp;
- struct iphdr ip;
- } _in, *inside;
- struct ip_conntrack_protocol *innerproto;
- struct ip_conntrack_tuple_hash *h;
- int dataoff;
-
- IP_NF_ASSERT(skb->nfct == NULL);
-
- /* Not enough header? */
- inside = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_in), &_in);
- if (inside == NULL)
- return -NF_ACCEPT;
-
- /* Ignore ICMP's containing fragments (shouldn't happen) */
- if (inside->ip.frag_off & htons(IP_OFFSET)) {
- DEBUGP("icmp_error_track: fragment of proto %u\n",
- inside->ip.protocol);
- return -NF_ACCEPT;
- }
-
- innerproto = ip_conntrack_proto_find_get(inside->ip.protocol);
- dataoff = ip_hdrlen(skb) + sizeof(inside->icmp) + inside->ip.ihl * 4;
- /* Are they talking about one of our connections? */
- if (!ip_ct_get_tuple(&inside->ip, skb, dataoff, &origtuple, innerproto)) {
- DEBUGP("icmp_error: ! get_tuple p=%u", inside->ip.protocol);
- ip_conntrack_proto_put(innerproto);
- return -NF_ACCEPT;
- }
-
- /* Ordinarily, we'd expect the inverted tupleproto, but it's
- been preserved inside the ICMP. */
- if (!ip_ct_invert_tuple(&innertuple, &origtuple, innerproto)) {
- DEBUGP("icmp_error_track: Can't invert tuple\n");
- ip_conntrack_proto_put(innerproto);
- return -NF_ACCEPT;
- }
- ip_conntrack_proto_put(innerproto);
-
- *ctinfo = IP_CT_RELATED;
-
- h = ip_conntrack_find_get(&innertuple, NULL);
- if (!h) {
- /* Locally generated ICMPs will match inverted if they
- haven't been SNAT'ed yet */
- /* FIXME: NAT code has to handle half-done double NAT --RR */
- if (hooknum == NF_IP_LOCAL_OUT)
- h = ip_conntrack_find_get(&origtuple, NULL);
-
- if (!h) {
- DEBUGP("icmp_error_track: no match\n");
- return -NF_ACCEPT;
- }
- /* Reverse direction from that found */
- if (DIRECTION(h) != IP_CT_DIR_REPLY)
- *ctinfo += IP_CT_IS_REPLY;
- } else {
- if (DIRECTION(h) == IP_CT_DIR_REPLY)
- *ctinfo += IP_CT_IS_REPLY;
- }
-
- /* Update skb to refer to this connection */
- skb->nfct = &tuplehash_to_ctrack(h)->ct_general;
- skb->nfctinfo = *ctinfo;
- return -NF_ACCEPT;
-}
-
-/* Small and modified version of icmp_rcv */
-static int
-icmp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
- unsigned int hooknum)
-{
- struct icmphdr _ih, *icmph;
-
- /* Not enough header? */
- icmph = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_ih), &_ih);
- if (icmph == NULL) {
- if (LOG_INVALID(IPPROTO_ICMP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
- "ip_ct_icmp: short packet ");
- return -NF_ACCEPT;
- }
-
- /* See ip_conntrack_proto_tcp.c */
- if (ip_conntrack_checksum && hooknum == NF_IP_PRE_ROUTING &&
- nf_ip_checksum(skb, hooknum, ip_hdrlen(skb), 0)) {
- if (LOG_INVALID(IPPROTO_ICMP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
- "ip_ct_icmp: bad ICMP checksum ");
- return -NF_ACCEPT;
- }
-
- /*
- * 18 is the highest 'known' ICMP type. Anything else is a mystery
- *
- * RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently
- * discarded.
- */
- if (icmph->type > NR_ICMP_TYPES) {
- if (LOG_INVALID(IPPROTO_ICMP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
- "ip_ct_icmp: invalid ICMP type ");
- return -NF_ACCEPT;
- }
-
- /* Need to track icmp error message? */
- if (icmph->type != ICMP_DEST_UNREACH
- && icmph->type != ICMP_SOURCE_QUENCH
- && icmph->type != ICMP_TIME_EXCEEDED
- && icmph->type != ICMP_PARAMETERPROB
- && icmph->type != ICMP_REDIRECT)
- return NF_ACCEPT;
-
- return icmp_error_message(skb, ctinfo, hooknum);
-}
-
-#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
- defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
-static int icmp_tuple_to_nfattr(struct sk_buff *skb,
- const struct ip_conntrack_tuple *t)
-{
- NFA_PUT(skb, CTA_PROTO_ICMP_ID, sizeof(__be16),
- &t->src.u.icmp.id);
- NFA_PUT(skb, CTA_PROTO_ICMP_TYPE, sizeof(u_int8_t),
- &t->dst.u.icmp.type);
- NFA_PUT(skb, CTA_PROTO_ICMP_CODE, sizeof(u_int8_t),
- &t->dst.u.icmp.code);
-
- return 0;
-
-nfattr_failure:
- return -1;
-}
-
-static int icmp_nfattr_to_tuple(struct nfattr *tb[],
- struct ip_conntrack_tuple *tuple)
-{
- if (!tb[CTA_PROTO_ICMP_TYPE-1]
- || !tb[CTA_PROTO_ICMP_CODE-1]
- || !tb[CTA_PROTO_ICMP_ID-1])
- return -EINVAL;
-
- tuple->dst.u.icmp.type =
- *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMP_TYPE-1]);
- tuple->dst.u.icmp.code =
- *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMP_CODE-1]);
- tuple->src.u.icmp.id =
- *(__be16 *)NFA_DATA(tb[CTA_PROTO_ICMP_ID-1]);
-
- if (tuple->dst.u.icmp.type >= sizeof(invmap)
- || !invmap[tuple->dst.u.icmp.type])
- return -EINVAL;
-
- return 0;
-}
-#endif
-
-struct ip_conntrack_protocol ip_conntrack_protocol_icmp =
-{
- .proto = IPPROTO_ICMP,
- .name = "icmp",
- .pkt_to_tuple = icmp_pkt_to_tuple,
- .invert_tuple = icmp_invert_tuple,
- .print_tuple = icmp_print_tuple,
- .print_conntrack = icmp_print_conntrack,
- .packet = icmp_packet,
- .new = icmp_new,
- .error = icmp_error,
-#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
- defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
- .tuple_to_nfattr = icmp_tuple_to_nfattr,
- .nfattr_to_tuple = icmp_nfattr_to_tuple,
-#endif
-};
+++ /dev/null
-/*
- * Connection tracking protocol helper module for SCTP.
- *
- * SCTP is defined in RFC 2960. References to various sections in this code
- * are to this RFC.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-/*
- * Added support for proc manipulation of timeouts.
- */
-
-#include <linux/types.h>
-#include <linux/timer.h>
-#include <linux/interrupt.h>
-#include <linux/netfilter.h>
-#include <linux/module.h>
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/sctp.h>
-#include <linux/string.h>
-#include <linux/seq_file.h>
-
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
-
-#if 0
-#define DEBUGP(format, ...) printk(format, ## __VA_ARGS__)
-#else
-#define DEBUGP(format, args...)
-#endif
-
-/* Protects conntrack->proto.sctp */
-static DEFINE_RWLOCK(sctp_lock);
-
-/* FIXME: Examine ipfilter's timeouts and conntrack transitions more
- closely. They're more complex. --RR
-
- And so for me for SCTP :D -Kiran */
-
-static const char *sctp_conntrack_names[] = {
- "NONE",
- "CLOSED",
- "COOKIE_WAIT",
- "COOKIE_ECHOED",
- "ESTABLISHED",
- "SHUTDOWN_SENT",
- "SHUTDOWN_RECD",
- "SHUTDOWN_ACK_SENT",
-};
-
-#define SECS * HZ
-#define MINS * 60 SECS
-#define HOURS * 60 MINS
-#define DAYS * 24 HOURS
-
-static unsigned int ip_ct_sctp_timeout_closed __read_mostly = 10 SECS;
-static unsigned int ip_ct_sctp_timeout_cookie_wait __read_mostly = 3 SECS;
-static unsigned int ip_ct_sctp_timeout_cookie_echoed __read_mostly = 3 SECS;
-static unsigned int ip_ct_sctp_timeout_established __read_mostly = 5 DAYS;
-static unsigned int ip_ct_sctp_timeout_shutdown_sent __read_mostly = 300 SECS / 1000;
-static unsigned int ip_ct_sctp_timeout_shutdown_recd __read_mostly = 300 SECS / 1000;
-static unsigned int ip_ct_sctp_timeout_shutdown_ack_sent __read_mostly = 3 SECS;
-
-static const unsigned int * sctp_timeouts[]
-= { NULL, /* SCTP_CONNTRACK_NONE */
- &ip_ct_sctp_timeout_closed, /* SCTP_CONNTRACK_CLOSED */
- &ip_ct_sctp_timeout_cookie_wait, /* SCTP_CONNTRACK_COOKIE_WAIT */
- &ip_ct_sctp_timeout_cookie_echoed, /* SCTP_CONNTRACK_COOKIE_ECHOED */
- &ip_ct_sctp_timeout_established, /* SCTP_CONNTRACK_ESTABLISHED */
- &ip_ct_sctp_timeout_shutdown_sent, /* SCTP_CONNTRACK_SHUTDOWN_SENT */
- &ip_ct_sctp_timeout_shutdown_recd, /* SCTP_CONNTRACK_SHUTDOWN_RECD */
- &ip_ct_sctp_timeout_shutdown_ack_sent /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
- };
-
-#define sNO SCTP_CONNTRACK_NONE
-#define sCL SCTP_CONNTRACK_CLOSED
-#define sCW SCTP_CONNTRACK_COOKIE_WAIT
-#define sCE SCTP_CONNTRACK_COOKIE_ECHOED
-#define sES SCTP_CONNTRACK_ESTABLISHED
-#define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
-#define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
-#define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
-#define sIV SCTP_CONNTRACK_MAX
-
-/*
- These are the descriptions of the states:
-
-NOTE: These state names are tantalizingly similar to the states of an
-SCTP endpoint. But the interpretation of the states is a little different,
-considering that these are the states of the connection and not of an end
-point. Please note the subtleties. -Kiran
-
-NONE - Nothing so far.
-COOKIE WAIT - We have seen an INIT chunk in the original direction, or also
- an INIT_ACK chunk in the reply direction.
-COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction.
-ESTABLISHED - We have seen a COOKIE_ACK in the reply direction.
-SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction.
-SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin.
-SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
- to that of the SHUTDOWN chunk.
-CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
- the SHUTDOWN chunk. Connection is closed.
-*/
-
-/* TODO
- - I have assumed that the first INIT is in the original direction.
- This messes things when an INIT comes in the reply direction in CLOSED
- state.
- - Check the error type in the reply dir before transitioning from
-cookie echoed to closed.
- - Sec 5.2.4 of RFC 2960
- - Multi Homing support.
-*/
-
-/* SCTP conntrack state transitions */
-static const enum sctp_conntrack sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
- {
-/* ORIGINAL */
-/* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
-/* init */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
-/* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
-/* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
-/* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
-/* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
-/* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
-/* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
-/* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
-/* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
- },
- {
-/* REPLY */
-/* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
-/* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
-/* init_ack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
-/* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
-/* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
-/* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
-/* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
-/* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
-/* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
-/* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
- }
-};
-
-static int sctp_pkt_to_tuple(const struct sk_buff *skb,
- unsigned int dataoff,
- struct ip_conntrack_tuple *tuple)
-{
- sctp_sctphdr_t _hdr, *hp;
-
- DEBUGP(__FUNCTION__);
- DEBUGP("\n");
-
- /* Actually only need first 8 bytes. */
- hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
- if (hp == NULL)
- return 0;
-
- tuple->src.u.sctp.port = hp->source;
- tuple->dst.u.sctp.port = hp->dest;
- return 1;
-}
-
-static int sctp_invert_tuple(struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack_tuple *orig)
-{
- DEBUGP(__FUNCTION__);
- DEBUGP("\n");
-
- tuple->src.u.sctp.port = orig->dst.u.sctp.port;
- tuple->dst.u.sctp.port = orig->src.u.sctp.port;
- return 1;
-}
-
-/* Print out the per-protocol part of the tuple. */
-static int sctp_print_tuple(struct seq_file *s,
- const struct ip_conntrack_tuple *tuple)
-{
- DEBUGP(__FUNCTION__);
- DEBUGP("\n");
-
- return seq_printf(s, "sport=%hu dport=%hu ",
- ntohs(tuple->src.u.sctp.port),
- ntohs(tuple->dst.u.sctp.port));
-}
-
-/* Print out the private part of the conntrack. */
-static int sctp_print_conntrack(struct seq_file *s,
- const struct ip_conntrack *conntrack)
-{
- enum sctp_conntrack state;
-
- DEBUGP(__FUNCTION__);
- DEBUGP("\n");
-
- read_lock_bh(&sctp_lock);
- state = conntrack->proto.sctp.state;
- read_unlock_bh(&sctp_lock);
-
- return seq_printf(s, "%s ", sctp_conntrack_names[state]);
-}
-
-#define for_each_sctp_chunk(skb, sch, _sch, offset, count) \
-for (offset = ip_hdrlen(skb) + sizeof(sctp_sctphdr_t), count = 0; \
- offset < skb->len && \
- (sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch)); \
- offset += (ntohs(sch->length) + 3) & ~3, count++)
-
-/* Some validity checks to make sure the chunks are fine */
-static int do_basic_checks(struct ip_conntrack *conntrack,
- const struct sk_buff *skb,
- char *map)
-{
- u_int32_t offset, count;
- sctp_chunkhdr_t _sch, *sch;
- int flag;
-
- DEBUGP(__FUNCTION__);
- DEBUGP("\n");
-
- flag = 0;
-
- for_each_sctp_chunk (skb, sch, _sch, offset, count) {
- DEBUGP("Chunk Num: %d Type: %d\n", count, sch->type);
-
- if (sch->type == SCTP_CID_INIT
- || sch->type == SCTP_CID_INIT_ACK
- || sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
- flag = 1;
- }
-
- /*
- * Cookie Ack/Echo chunks not the first OR
- * Init / Init Ack / Shutdown compl chunks not the only chunks
- * OR zero-length.
- */
- if (((sch->type == SCTP_CID_COOKIE_ACK
- || sch->type == SCTP_CID_COOKIE_ECHO
- || flag)
- && count !=0) || !sch->length) {
- DEBUGP("Basic checks failed\n");
- return 1;
- }
-
- if (map) {
- set_bit(sch->type, (void *)map);
- }
- }
-
- DEBUGP("Basic checks passed\n");
- return count == 0;
-}
-
-static int new_state(enum ip_conntrack_dir dir,
- enum sctp_conntrack cur_state,
- int chunk_type)
-{
- int i;
-
- DEBUGP(__FUNCTION__);
- DEBUGP("\n");
-
- DEBUGP("Chunk type: %d\n", chunk_type);
-
- switch (chunk_type) {
- case SCTP_CID_INIT:
- DEBUGP("SCTP_CID_INIT\n");
- i = 0; break;
- case SCTP_CID_INIT_ACK:
- DEBUGP("SCTP_CID_INIT_ACK\n");
- i = 1; break;
- case SCTP_CID_ABORT:
- DEBUGP("SCTP_CID_ABORT\n");
- i = 2; break;
- case SCTP_CID_SHUTDOWN:
- DEBUGP("SCTP_CID_SHUTDOWN\n");
- i = 3; break;
- case SCTP_CID_SHUTDOWN_ACK:
- DEBUGP("SCTP_CID_SHUTDOWN_ACK\n");
- i = 4; break;
- case SCTP_CID_ERROR:
- DEBUGP("SCTP_CID_ERROR\n");
- i = 5; break;
- case SCTP_CID_COOKIE_ECHO:
- DEBUGP("SCTP_CID_COOKIE_ECHO\n");
- i = 6; break;
- case SCTP_CID_COOKIE_ACK:
- DEBUGP("SCTP_CID_COOKIE_ACK\n");
- i = 7; break;
- case SCTP_CID_SHUTDOWN_COMPLETE:
- DEBUGP("SCTP_CID_SHUTDOWN_COMPLETE\n");
- i = 8; break;
- default:
- /* Other chunks like DATA, SACK, HEARTBEAT and
- its ACK do not cause a change in state */
- DEBUGP("Unknown chunk type, Will stay in %s\n",
- sctp_conntrack_names[cur_state]);
- return cur_state;
- }
-
- DEBUGP("dir: %d cur_state: %s chunk_type: %d new_state: %s\n",
- dir, sctp_conntrack_names[cur_state], chunk_type,
- sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
-
- return sctp_conntracks[dir][i][cur_state];
-}
-
-/* Returns verdict for packet, or -1 for invalid. */
-static int sctp_packet(struct ip_conntrack *conntrack,
- const struct sk_buff *skb,
- enum ip_conntrack_info ctinfo)
-{
- enum sctp_conntrack newconntrack, oldsctpstate;
- struct iphdr *iph = ip_hdr(skb);
- sctp_sctphdr_t _sctph, *sh;
- sctp_chunkhdr_t _sch, *sch;
- u_int32_t offset, count;
- char map[256 / sizeof (char)] = {0};
-
- DEBUGP(__FUNCTION__);
- DEBUGP("\n");
-
- sh = skb_header_pointer(skb, iph->ihl * 4, sizeof(_sctph), &_sctph);
- if (sh == NULL)
- return -1;
-
- if (do_basic_checks(conntrack, skb, map) != 0)
- return -1;
-
- /* Check the verification tag (Sec 8.5) */
- if (!test_bit(SCTP_CID_INIT, (void *)map)
- && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
- && !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
- && !test_bit(SCTP_CID_ABORT, (void *)map)
- && !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
- && (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
- DEBUGP("Verification tag check failed\n");
- return -1;
- }
-
- oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
- for_each_sctp_chunk (skb, sch, _sch, offset, count) {
- write_lock_bh(&sctp_lock);
-
- /* Special cases of Verification tag check (Sec 8.5.1) */
- if (sch->type == SCTP_CID_INIT) {
- /* Sec 8.5.1 (A) */
- if (sh->vtag != 0) {
- write_unlock_bh(&sctp_lock);
- return -1;
- }
- } else if (sch->type == SCTP_CID_ABORT) {
- /* Sec 8.5.1 (B) */
- if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
- && !(sh->vtag == conntrack->proto.sctp.vtag
- [1 - CTINFO2DIR(ctinfo)])) {
- write_unlock_bh(&sctp_lock);
- return -1;
- }
- } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
- /* Sec 8.5.1 (C) */
- if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
- && !(sh->vtag == conntrack->proto.sctp.vtag
- [1 - CTINFO2DIR(ctinfo)]
- && (sch->flags & 1))) {
- write_unlock_bh(&sctp_lock);
- return -1;
- }
- } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
- /* Sec 8.5.1 (D) */
- if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
- write_unlock_bh(&sctp_lock);
- return -1;
- }
- }
-
- oldsctpstate = conntrack->proto.sctp.state;
- newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
-
- /* Invalid */
- if (newconntrack == SCTP_CONNTRACK_MAX) {
- DEBUGP("ip_conntrack_sctp: Invalid dir=%i ctype=%u conntrack=%u\n",
- CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
- write_unlock_bh(&sctp_lock);
- return -1;
- }
-
- /* If it is an INIT or an INIT ACK note down the vtag */
- if (sch->type == SCTP_CID_INIT
- || sch->type == SCTP_CID_INIT_ACK) {
- sctp_inithdr_t _inithdr, *ih;
-
- ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
- sizeof(_inithdr), &_inithdr);
- if (ih == NULL) {
- write_unlock_bh(&sctp_lock);
- return -1;
- }
- DEBUGP("Setting vtag %x for dir %d\n",
- ih->init_tag, !CTINFO2DIR(ctinfo));
- conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
- }
-
- conntrack->proto.sctp.state = newconntrack;
- if (oldsctpstate != newconntrack)
- ip_conntrack_event_cache(IPCT_PROTOINFO, skb);
- write_unlock_bh(&sctp_lock);
- }
-
- ip_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
-
- if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
- && CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
- && newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
- DEBUGP("Setting assured bit\n");
- set_bit(IPS_ASSURED_BIT, &conntrack->status);
- ip_conntrack_event_cache(IPCT_STATUS, skb);
- }
-
- return NF_ACCEPT;
-}
-
-/* Called when a new connection for this protocol found. */
-static int sctp_new(struct ip_conntrack *conntrack,
- const struct sk_buff *skb)
-{
- enum sctp_conntrack newconntrack;
- struct iphdr *iph = ip_hdr(skb);
- sctp_sctphdr_t _sctph, *sh;
- sctp_chunkhdr_t _sch, *sch;
- u_int32_t offset, count;
- char map[256 / sizeof (char)] = {0};
-
- DEBUGP(__FUNCTION__);
- DEBUGP("\n");
-
- sh = skb_header_pointer(skb, iph->ihl * 4, sizeof(_sctph), &_sctph);
- if (sh == NULL)
- return 0;
-
- if (do_basic_checks(conntrack, skb, map) != 0)
- return 0;
-
- /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
- if ((test_bit (SCTP_CID_ABORT, (void *)map))
- || (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
- || (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
- return 0;
- }
-
- newconntrack = SCTP_CONNTRACK_MAX;
- for_each_sctp_chunk (skb, sch, _sch, offset, count) {
- /* Don't need lock here: this conntrack not in circulation yet */
- newconntrack = new_state (IP_CT_DIR_ORIGINAL,
- SCTP_CONNTRACK_NONE, sch->type);
-
- /* Invalid: delete conntrack */
- if (newconntrack == SCTP_CONNTRACK_MAX) {
- DEBUGP("ip_conntrack_sctp: invalid new deleting.\n");
- return 0;
- }
-
- /* Copy the vtag into the state info */
- if (sch->type == SCTP_CID_INIT) {
- if (sh->vtag == 0) {
- sctp_inithdr_t _inithdr, *ih;
-
- ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
- sizeof(_inithdr), &_inithdr);
- if (ih == NULL)
- return 0;
-
- DEBUGP("Setting vtag %x for new conn\n",
- ih->init_tag);
-
- conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
- ih->init_tag;
- } else {
- /* Sec 8.5.1 (A) */
- return 0;
- }
- }
- /* If it is a shutdown ack OOTB packet, we expect a return
- shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
- else {
- DEBUGP("Setting vtag %x for new conn OOTB\n",
- sh->vtag);
- conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
- }
-
- conntrack->proto.sctp.state = newconntrack;
- }
-
- return 1;
-}
-
-static struct ip_conntrack_protocol ip_conntrack_protocol_sctp = {
- .proto = IPPROTO_SCTP,
- .name = "sctp",
- .pkt_to_tuple = sctp_pkt_to_tuple,
- .invert_tuple = sctp_invert_tuple,
- .print_tuple = sctp_print_tuple,
- .print_conntrack = sctp_print_conntrack,
- .packet = sctp_packet,
- .new = sctp_new,
- .destroy = NULL,
- .me = THIS_MODULE,
-#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
- defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
- .tuple_to_nfattr = ip_ct_port_tuple_to_nfattr,
- .nfattr_to_tuple = ip_ct_port_nfattr_to_tuple,
-#endif
-};
-
-#ifdef CONFIG_SYSCTL
-static ctl_table ip_ct_sysctl_table[] = {
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
- .procname = "ip_conntrack_sctp_timeout_closed",
- .data = &ip_ct_sctp_timeout_closed,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
- .procname = "ip_conntrack_sctp_timeout_cookie_wait",
- .data = &ip_ct_sctp_timeout_cookie_wait,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
- .procname = "ip_conntrack_sctp_timeout_cookie_echoed",
- .data = &ip_ct_sctp_timeout_cookie_echoed,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
- .procname = "ip_conntrack_sctp_timeout_established",
- .data = &ip_ct_sctp_timeout_established,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
- .procname = "ip_conntrack_sctp_timeout_shutdown_sent",
- .data = &ip_ct_sctp_timeout_shutdown_sent,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
- .procname = "ip_conntrack_sctp_timeout_shutdown_recd",
- .data = &ip_ct_sctp_timeout_shutdown_recd,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
- .procname = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
- .data = &ip_ct_sctp_timeout_shutdown_ack_sent,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- { .ctl_name = 0 }
-};
-
-static ctl_table ip_ct_netfilter_table[] = {
- {
- .ctl_name = NET_IPV4_NETFILTER,
- .procname = "netfilter",
- .mode = 0555,
- .child = ip_ct_sysctl_table,
- },
- { .ctl_name = 0 }
-};
-
-static ctl_table ip_ct_ipv4_table[] = {
- {
- .ctl_name = NET_IPV4,
- .procname = "ipv4",
- .mode = 0555,
- .child = ip_ct_netfilter_table,
- },
- { .ctl_name = 0 }
-};
-
-static ctl_table ip_ct_net_table[] = {
- {
- .ctl_name = CTL_NET,
- .procname = "net",
- .mode = 0555,
- .child = ip_ct_ipv4_table,
- },
- { .ctl_name = 0 }
-};
-
-static struct ctl_table_header *ip_ct_sysctl_header;
-#endif
-
-static int __init ip_conntrack_proto_sctp_init(void)
-{
- int ret;
-
- ret = ip_conntrack_protocol_register(&ip_conntrack_protocol_sctp);
- if (ret) {
- printk("ip_conntrack_proto_sctp: protocol register failed\n");
- goto out;
- }
-
-#ifdef CONFIG_SYSCTL
- ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table);
- if (ip_ct_sysctl_header == NULL) {
- ret = -ENOMEM;
- printk("ip_conntrack_proto_sctp: can't register to sysctl.\n");
- goto cleanup;
- }
-#endif
-
- return ret;
-
-#ifdef CONFIG_SYSCTL
- cleanup:
- ip_conntrack_protocol_unregister(&ip_conntrack_protocol_sctp);
-#endif
- out:
- DEBUGP("SCTP conntrack module loading %s\n",
- ret ? "failed": "succeeded");
- return ret;
-}
-
-static void __exit ip_conntrack_proto_sctp_fini(void)
-{
- ip_conntrack_protocol_unregister(&ip_conntrack_protocol_sctp);
-#ifdef CONFIG_SYSCTL
- unregister_sysctl_table(ip_ct_sysctl_header);
-#endif
- DEBUGP("SCTP conntrack module unloaded\n");
-}
-
-module_init(ip_conntrack_proto_sctp_init);
-module_exit(ip_conntrack_proto_sctp_fini);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Kiran Kumar Immidi");
-MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
+++ /dev/null
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>:
- * - Real stateful connection tracking
- * - Modified state transitions table
- * - Window scaling support added
- * - SACK support added
- *
- * Willy Tarreau:
- * - State table bugfixes
- * - More robust state changes
- * - Tuning timer parameters
- *
- * version 2.2
- */
-
-#include <linux/types.h>
-#include <linux/timer.h>
-#include <linux/netfilter.h>
-#include <linux/module.h>
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/tcp.h>
-#include <linux/spinlock.h>
-
-#include <net/tcp.h>
-
-#include <linux/netfilter_ipv4.h>
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
-
-#if 0
-#define DEBUGP printk
-#define DEBUGP_VARS
-#else
-#define DEBUGP(format, args...)
-#endif
-
-/* Protects conntrack->proto.tcp */
-static DEFINE_RWLOCK(tcp_lock);
-
-/* "Be conservative in what you do,
- be liberal in what you accept from others."
- If it's non-zero, we mark only out of window RST segments as INVALID. */
-int ip_ct_tcp_be_liberal __read_mostly = 0;
-
-/* If it is set to zero, we disable picking up already established
- connections. */
-int ip_ct_tcp_loose __read_mostly = 1;
-
-/* Max number of the retransmitted packets without receiving an (acceptable)
- ACK from the destination. If this number is reached, a shorter timer
- will be started. */
-int ip_ct_tcp_max_retrans __read_mostly = 3;
-
- /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
- closely. They're more complex. --RR */
-
-static const char *tcp_conntrack_names[] = {
- "NONE",
- "SYN_SENT",
- "SYN_RECV",
- "ESTABLISHED",
- "FIN_WAIT",
- "CLOSE_WAIT",
- "LAST_ACK",
- "TIME_WAIT",
- "CLOSE",
- "LISTEN"
-};
-
-#define SECS * HZ
-#define MINS * 60 SECS
-#define HOURS * 60 MINS
-#define DAYS * 24 HOURS
-
-unsigned int ip_ct_tcp_timeout_syn_sent __read_mostly = 2 MINS;
-unsigned int ip_ct_tcp_timeout_syn_recv __read_mostly = 60 SECS;
-unsigned int ip_ct_tcp_timeout_established __read_mostly = 5 DAYS;
-unsigned int ip_ct_tcp_timeout_fin_wait __read_mostly = 2 MINS;
-unsigned int ip_ct_tcp_timeout_close_wait __read_mostly = 60 SECS;
-unsigned int ip_ct_tcp_timeout_last_ack __read_mostly = 30 SECS;
-unsigned int ip_ct_tcp_timeout_time_wait __read_mostly = 2 MINS;
-unsigned int ip_ct_tcp_timeout_close __read_mostly = 10 SECS;
-
-/* RFC1122 says the R2 limit should be at least 100 seconds.
- Linux uses 15 packets as limit, which corresponds
- to ~13-30min depending on RTO. */
-unsigned int ip_ct_tcp_timeout_max_retrans __read_mostly = 5 MINS;
-
-static const unsigned int * tcp_timeouts[]
-= { NULL, /* TCP_CONNTRACK_NONE */
- &ip_ct_tcp_timeout_syn_sent, /* TCP_CONNTRACK_SYN_SENT, */
- &ip_ct_tcp_timeout_syn_recv, /* TCP_CONNTRACK_SYN_RECV, */
- &ip_ct_tcp_timeout_established, /* TCP_CONNTRACK_ESTABLISHED, */
- &ip_ct_tcp_timeout_fin_wait, /* TCP_CONNTRACK_FIN_WAIT, */
- &ip_ct_tcp_timeout_close_wait, /* TCP_CONNTRACK_CLOSE_WAIT, */
- &ip_ct_tcp_timeout_last_ack, /* TCP_CONNTRACK_LAST_ACK, */
- &ip_ct_tcp_timeout_time_wait, /* TCP_CONNTRACK_TIME_WAIT, */
- &ip_ct_tcp_timeout_close, /* TCP_CONNTRACK_CLOSE, */
- NULL, /* TCP_CONNTRACK_LISTEN */
- };
-
-#define sNO TCP_CONNTRACK_NONE
-#define sSS TCP_CONNTRACK_SYN_SENT
-#define sSR TCP_CONNTRACK_SYN_RECV
-#define sES TCP_CONNTRACK_ESTABLISHED
-#define sFW TCP_CONNTRACK_FIN_WAIT
-#define sCW TCP_CONNTRACK_CLOSE_WAIT
-#define sLA TCP_CONNTRACK_LAST_ACK
-#define sTW TCP_CONNTRACK_TIME_WAIT
-#define sCL TCP_CONNTRACK_CLOSE
-#define sLI TCP_CONNTRACK_LISTEN
-#define sIV TCP_CONNTRACK_MAX
-#define sIG TCP_CONNTRACK_IGNORE
-
-/* What TCP flags are set from RST/SYN/FIN/ACK. */
-enum tcp_bit_set {
- TCP_SYN_SET,
- TCP_SYNACK_SET,
- TCP_FIN_SET,
- TCP_ACK_SET,
- TCP_RST_SET,
- TCP_NONE_SET,
-};
-
-/*
- * The TCP state transition table needs a few words...
- *
- * We are the man in the middle. All the packets go through us
- * but might get lost in transit to the destination.
- * It is assumed that the destinations can't receive segments
- * we haven't seen.
- *
- * The checked segment is in window, but our windows are *not*
- * equivalent with the ones of the sender/receiver. We always
- * try to guess the state of the current sender.
- *
- * The meaning of the states are:
- *
- * NONE: initial state
- * SYN_SENT: SYN-only packet seen
- * SYN_RECV: SYN-ACK packet seen
- * ESTABLISHED: ACK packet seen
- * FIN_WAIT: FIN packet seen
- * CLOSE_WAIT: ACK seen (after FIN)
- * LAST_ACK: FIN seen (after FIN)
- * TIME_WAIT: last ACK seen
- * CLOSE: closed connection
- *
- * LISTEN state is not used.
- *
- * Packets marked as IGNORED (sIG):
- * if they may be either invalid or valid
- * and the receiver may send back a connection
- * closing RST or a SYN/ACK.
- *
- * Packets marked as INVALID (sIV):
- * if they are invalid
- * or we do not support the request (simultaneous open)
- */
-static const enum tcp_conntrack tcp_conntracks[2][6][TCP_CONNTRACK_MAX] = {
- {
-/* ORIGINAL */
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*syn*/ { sSS, sSS, sIG, sIG, sIG, sIG, sIG, sSS, sSS, sIV },
-/*
- * sNO -> sSS Initialize a new connection
- * sSS -> sSS Retransmitted SYN
- * sSR -> sIG Late retransmitted SYN?
- * sES -> sIG Error: SYNs in window outside the SYN_SENT state
- * are errors. Receiver will reply with RST
- * and close the connection.
- * Or we are not in sync and hold a dead connection.
- * sFW -> sIG
- * sCW -> sIG
- * sLA -> sIG
- * sTW -> sSS Reopened connection (RFC 1122).
- * sCL -> sSS
- */
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*synack*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV },
-/*
- * A SYN/ACK from the client is always invalid:
- * - either it tries to set up a simultaneous open, which is
- * not supported;
- * - or the firewall has just been inserted between the two hosts
- * during the session set-up. The SYN will be retransmitted
- * by the true client (or it'll time out).
- */
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV },
-/*
- * sNO -> sIV Too late and no reason to do anything...
- * sSS -> sIV Client migth not send FIN in this state:
- * we enforce waiting for a SYN/ACK reply first.
- * sSR -> sFW Close started.
- * sES -> sFW
- * sFW -> sLA FIN seen in both directions, waiting for
- * the last ACK.
- * Migth be a retransmitted FIN as well...
- * sCW -> sLA
- * sLA -> sLA Retransmitted FIN. Remain in the same state.
- * sTW -> sTW
- * sCL -> sCL
- */
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*ack*/ { sES, sIV, sES, sES, sCW, sCW, sTW, sTW, sCL, sIV },
-/*
- * sNO -> sES Assumed.
- * sSS -> sIV ACK is invalid: we haven't seen a SYN/ACK yet.
- * sSR -> sES Established state is reached.
- * sES -> sES :-)
- * sFW -> sCW Normal close request answered by ACK.
- * sCW -> sCW
- * sLA -> sTW Last ACK detected.
- * sTW -> sTW Retransmitted last ACK. Remain in the same state.
- * sCL -> sCL
- */
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV },
-/*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }
- },
- {
-/* REPLY */
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*syn*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV },
-/*
- * sNO -> sIV Never reached.
- * sSS -> sIV Simultaneous open, not supported
- * sSR -> sIV Simultaneous open, not supported.
- * sES -> sIV Server may not initiate a connection.
- * sFW -> sIV
- * sCW -> sIV
- * sLA -> sIV
- * sTW -> sIV Reopened connection, but server may not do it.
- * sCL -> sIV
- */
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*synack*/ { sIV, sSR, sSR, sIG, sIG, sIG, sIG, sIG, sIG, sIV },
-/*
- * sSS -> sSR Standard open.
- * sSR -> sSR Retransmitted SYN/ACK.
- * sES -> sIG Late retransmitted SYN/ACK?
- * sFW -> sIG Might be SYN/ACK answering ignored SYN
- * sCW -> sIG
- * sLA -> sIG
- * sTW -> sIG
- * sCL -> sIG
- */
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV },
-/*
- * sSS -> sIV Server might not send FIN in this state.
- * sSR -> sFW Close started.
- * sES -> sFW
- * sFW -> sLA FIN seen in both directions.
- * sCW -> sLA
- * sLA -> sLA Retransmitted FIN.
- * sTW -> sTW
- * sCL -> sCL
- */
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*ack*/ { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV },
-/*
- * sSS -> sIG Might be a half-open connection.
- * sSR -> sSR Might answer late resent SYN.
- * sES -> sES :-)
- * sFW -> sCW Normal close request answered by ACK.
- * sCW -> sCW
- * sLA -> sTW Last ACK detected.
- * sTW -> sTW Retransmitted last ACK.
- * sCL -> sCL
- */
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV },
-/*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }
- }
-};
-
-static int tcp_pkt_to_tuple(const struct sk_buff *skb,
- unsigned int dataoff,
- struct ip_conntrack_tuple *tuple)
-{
- struct tcphdr _hdr, *hp;
-
- /* Actually only need first 8 bytes. */
- hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
- if (hp == NULL)
- return 0;
-
- tuple->src.u.tcp.port = hp->source;
- tuple->dst.u.tcp.port = hp->dest;
-
- return 1;
-}
-
-static int tcp_invert_tuple(struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack_tuple *orig)
-{
- tuple->src.u.tcp.port = orig->dst.u.tcp.port;
- tuple->dst.u.tcp.port = orig->src.u.tcp.port;
- return 1;
-}
-
-/* Print out the per-protocol part of the tuple. */
-static int tcp_print_tuple(struct seq_file *s,
- const struct ip_conntrack_tuple *tuple)
-{
- return seq_printf(s, "sport=%hu dport=%hu ",
- ntohs(tuple->src.u.tcp.port),
- ntohs(tuple->dst.u.tcp.port));
-}
-
-/* Print out the private part of the conntrack. */
-static int tcp_print_conntrack(struct seq_file *s,
- const struct ip_conntrack *conntrack)
-{
- enum tcp_conntrack state;
-
- read_lock_bh(&tcp_lock);
- state = conntrack->proto.tcp.state;
- read_unlock_bh(&tcp_lock);
-
- return seq_printf(s, "%s ", tcp_conntrack_names[state]);
-}
-
-#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
- defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
-static int tcp_to_nfattr(struct sk_buff *skb, struct nfattr *nfa,
- const struct ip_conntrack *ct)
-{
- struct nfattr *nest_parms;
-
- read_lock_bh(&tcp_lock);
- nest_parms = NFA_NEST(skb, CTA_PROTOINFO_TCP);
- NFA_PUT(skb, CTA_PROTOINFO_TCP_STATE, sizeof(u_int8_t),
- &ct->proto.tcp.state);
- read_unlock_bh(&tcp_lock);
-
- NFA_NEST_END(skb, nest_parms);
-
- return 0;
-
-nfattr_failure:
- read_unlock_bh(&tcp_lock);
- return -1;
-}
-
-static const size_t cta_min_tcp[CTA_PROTOINFO_TCP_MAX] = {
- [CTA_PROTOINFO_TCP_STATE-1] = sizeof(u_int8_t),
-};
-
-static int nfattr_to_tcp(struct nfattr *cda[], struct ip_conntrack *ct)
-{
- struct nfattr *attr = cda[CTA_PROTOINFO_TCP-1];
- struct nfattr *tb[CTA_PROTOINFO_TCP_MAX];
-
- /* updates could not contain anything about the private
- * protocol info, in that case skip the parsing */
- if (!attr)
- return 0;
-
- nfattr_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, attr);
-
- if (nfattr_bad_size(tb, CTA_PROTOINFO_TCP_MAX, cta_min_tcp))
- return -EINVAL;
-
- if (!tb[CTA_PROTOINFO_TCP_STATE-1])
- return -EINVAL;
-
- write_lock_bh(&tcp_lock);
- ct->proto.tcp.state =
- *(u_int8_t *)NFA_DATA(tb[CTA_PROTOINFO_TCP_STATE-1]);
- write_unlock_bh(&tcp_lock);
-
- return 0;
-}
-#endif
-
-static unsigned int get_conntrack_index(const struct tcphdr *tcph)
-{
- if (tcph->rst) return TCP_RST_SET;
- else if (tcph->syn) return (tcph->ack ? TCP_SYNACK_SET : TCP_SYN_SET);
- else if (tcph->fin) return TCP_FIN_SET;
- else if (tcph->ack) return TCP_ACK_SET;
- else return TCP_NONE_SET;
-}
-
-/* TCP connection tracking based on 'Real Stateful TCP Packet Filtering
- in IP Filter' by Guido van Rooij.
-
- http://www.nluug.nl/events/sane2000/papers.html
- http://www.iae.nl/users/guido/papers/tcp_filtering.ps.gz
-
- The boundaries and the conditions are changed according to RFC793:
- the packet must intersect the window (i.e. segments may be
- after the right or before the left edge) and thus receivers may ACK
- segments after the right edge of the window.
-
- td_maxend = max(sack + max(win,1)) seen in reply packets
- td_maxwin = max(max(win, 1)) + (sack - ack) seen in sent packets
- td_maxwin += seq + len - sender.td_maxend
- if seq + len > sender.td_maxend
- td_end = max(seq + len) seen in sent packets
-
- I. Upper bound for valid data: seq <= sender.td_maxend
- II. Lower bound for valid data: seq + len >= sender.td_end - receiver.td_maxwin
- III. Upper bound for valid ack: sack <= receiver.td_end
- IV. Lower bound for valid ack: ack >= receiver.td_end - MAXACKWINDOW
-
- where sack is the highest right edge of sack block found in the packet.
-
- The upper bound limit for a valid ack is not ignored -
- we doesn't have to deal with fragments.
-*/
-
-static inline __u32 segment_seq_plus_len(__u32 seq,
- size_t len,
- struct iphdr *iph,
- struct tcphdr *tcph)
-{
- return (seq + len - (iph->ihl + tcph->doff)*4
- + (tcph->syn ? 1 : 0) + (tcph->fin ? 1 : 0));
-}
-
-/* Fixme: what about big packets? */
-#define MAXACKWINCONST 66000
-#define MAXACKWINDOW(sender) \
- ((sender)->td_maxwin > MAXACKWINCONST ? (sender)->td_maxwin \
- : MAXACKWINCONST)
-
-/*
- * Simplified tcp_parse_options routine from tcp_input.c
- */
-static void tcp_options(const struct sk_buff *skb,
- struct iphdr *iph,
- struct tcphdr *tcph,
- struct ip_ct_tcp_state *state)
-{
- unsigned char buff[(15 * 4) - sizeof(struct tcphdr)];
- unsigned char *ptr;
- int length = (tcph->doff*4) - sizeof(struct tcphdr);
-
- if (!length)
- return;
-
- ptr = skb_header_pointer(skb,
- (iph->ihl * 4) + sizeof(struct tcphdr),
- length, buff);
- BUG_ON(ptr == NULL);
-
- state->td_scale =
- state->flags = 0;
-
- while (length > 0) {
- int opcode=*ptr++;
- int opsize;
-
- switch (opcode) {
- case TCPOPT_EOL:
- return;
- case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */
- length--;
- continue;
- default:
- opsize=*ptr++;
- if (opsize < 2) /* "silly options" */
- return;
- if (opsize > length)
- break; /* don't parse partial options */
-
- if (opcode == TCPOPT_SACK_PERM
- && opsize == TCPOLEN_SACK_PERM)
- state->flags |= IP_CT_TCP_FLAG_SACK_PERM;
- else if (opcode == TCPOPT_WINDOW
- && opsize == TCPOLEN_WINDOW) {
- state->td_scale = *(u_int8_t *)ptr;
-
- if (state->td_scale > 14) {
- /* See RFC1323 */
- state->td_scale = 14;
- }
- state->flags |=
- IP_CT_TCP_FLAG_WINDOW_SCALE;
- }
- ptr += opsize - 2;
- length -= opsize;
- }
- }
-}
-
-static void tcp_sack(const struct sk_buff *skb,
- struct iphdr *iph,
- struct tcphdr *tcph,
- __u32 *sack)
-{
- unsigned char buff[(15 * 4) - sizeof(struct tcphdr)];
- unsigned char *ptr;
- int length = (tcph->doff*4) - sizeof(struct tcphdr);
- __u32 tmp;
-
- if (!length)
- return;
-
- ptr = skb_header_pointer(skb,
- (iph->ihl * 4) + sizeof(struct tcphdr),
- length, buff);
- BUG_ON(ptr == NULL);
-
- /* Fast path for timestamp-only option */
- if (length == TCPOLEN_TSTAMP_ALIGNED*4
- && *(__be32 *)ptr == htonl((TCPOPT_NOP << 24)
- | (TCPOPT_NOP << 16)
- | (TCPOPT_TIMESTAMP << 8)
- | TCPOLEN_TIMESTAMP))
- return;
-
- while (length > 0) {
- int opcode=*ptr++;
- int opsize, i;
-
- switch (opcode) {
- case TCPOPT_EOL:
- return;
- case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */
- length--;
- continue;
- default:
- opsize=*ptr++;
- if (opsize < 2) /* "silly options" */
- return;
- if (opsize > length)
- break; /* don't parse partial options */
-
- if (opcode == TCPOPT_SACK
- && opsize >= (TCPOLEN_SACK_BASE
- + TCPOLEN_SACK_PERBLOCK)
- && !((opsize - TCPOLEN_SACK_BASE)
- % TCPOLEN_SACK_PERBLOCK)) {
- for (i = 0;
- i < (opsize - TCPOLEN_SACK_BASE);
- i += TCPOLEN_SACK_PERBLOCK) {
- tmp = ntohl(*((__be32 *)(ptr+i)+1));
-
- if (after(tmp, *sack))
- *sack = tmp;
- }
- return;
- }
- ptr += opsize - 2;
- length -= opsize;
- }
- }
-}
-
-static int tcp_in_window(struct ip_ct_tcp *state,
- enum ip_conntrack_dir dir,
- unsigned int index,
- const struct sk_buff *skb,
- struct iphdr *iph,
- struct tcphdr *tcph)
-{
- struct ip_ct_tcp_state *sender = &state->seen[dir];
- struct ip_ct_tcp_state *receiver = &state->seen[!dir];
- __u32 seq, ack, sack, end, win, swin;
- int res;
-
- /*
- * Get the required data from the packet.
- */
- seq = ntohl(tcph->seq);
- ack = sack = ntohl(tcph->ack_seq);
- win = ntohs(tcph->window);
- end = segment_seq_plus_len(seq, skb->len, iph, tcph);
-
- if (receiver->flags & IP_CT_TCP_FLAG_SACK_PERM)
- tcp_sack(skb, iph, tcph, &sack);
-
- DEBUGP("tcp_in_window: START\n");
- DEBUGP("tcp_in_window: src=%u.%u.%u.%u:%hu dst=%u.%u.%u.%u:%hu "
- "seq=%u ack=%u sack=%u win=%u end=%u\n",
- NIPQUAD(iph->saddr), ntohs(tcph->source),
- NIPQUAD(iph->daddr), ntohs(tcph->dest),
- seq, ack, sack, win, end);
- DEBUGP("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i "
- "receiver end=%u maxend=%u maxwin=%u scale=%i\n",
- sender->td_end, sender->td_maxend, sender->td_maxwin,
- sender->td_scale,
- receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
- receiver->td_scale);
-
- if (sender->td_end == 0) {
- /*
- * Initialize sender data.
- */
- if (tcph->syn && tcph->ack) {
- /*
- * Outgoing SYN-ACK in reply to a SYN.
- */
- sender->td_end =
- sender->td_maxend = end;
- sender->td_maxwin = (win == 0 ? 1 : win);
-
- tcp_options(skb, iph, tcph, sender);
- /*
- * RFC 1323:
- * Both sides must send the Window Scale option
- * to enable window scaling in either direction.
- */
- if (!(sender->flags & IP_CT_TCP_FLAG_WINDOW_SCALE
- && receiver->flags & IP_CT_TCP_FLAG_WINDOW_SCALE))
- sender->td_scale =
- receiver->td_scale = 0;
- } else {
- /*
- * We are in the middle of a connection,
- * its history is lost for us.
- * Let's try to use the data from the packet.
- */
- sender->td_end = end;
- sender->td_maxwin = (win == 0 ? 1 : win);
- sender->td_maxend = end + sender->td_maxwin;
- }
- } else if (((state->state == TCP_CONNTRACK_SYN_SENT
- && dir == IP_CT_DIR_ORIGINAL)
- || (state->state == TCP_CONNTRACK_SYN_RECV
- && dir == IP_CT_DIR_REPLY))
- && after(end, sender->td_end)) {
- /*
- * RFC 793: "if a TCP is reinitialized ... then it need
- * not wait at all; it must only be sure to use sequence
- * numbers larger than those recently used."
- */
- sender->td_end =
- sender->td_maxend = end;
- sender->td_maxwin = (win == 0 ? 1 : win);
-
- tcp_options(skb, iph, tcph, sender);
- }
-
- if (!(tcph->ack)) {
- /*
- * If there is no ACK, just pretend it was set and OK.
- */
- ack = sack = receiver->td_end;
- } else if (((tcp_flag_word(tcph) & (TCP_FLAG_ACK|TCP_FLAG_RST)) ==
- (TCP_FLAG_ACK|TCP_FLAG_RST))
- && (ack == 0)) {
- /*
- * Broken TCP stacks, that set ACK in RST packets as well
- * with zero ack value.
- */
- ack = sack = receiver->td_end;
- }
-
- if (seq == end
- && (!tcph->rst
- || (seq == 0 && state->state == TCP_CONNTRACK_SYN_SENT)))
- /*
- * Packets contains no data: we assume it is valid
- * and check the ack value only.
- * However RST segments are always validated by their
- * SEQ number, except when seq == 0 (reset sent answering
- * SYN.
- */
- seq = end = sender->td_end;
-
- DEBUGP("tcp_in_window: src=%u.%u.%u.%u:%hu dst=%u.%u.%u.%u:%hu "
- "seq=%u ack=%u sack =%u win=%u end=%u\n",
- NIPQUAD(iph->saddr), ntohs(tcph->source),
- NIPQUAD(iph->daddr), ntohs(tcph->dest),
- seq, ack, sack, win, end);
- DEBUGP("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i "
- "receiver end=%u maxend=%u maxwin=%u scale=%i\n",
- sender->td_end, sender->td_maxend, sender->td_maxwin,
- sender->td_scale,
- receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
- receiver->td_scale);
-
- DEBUGP("tcp_in_window: I=%i II=%i III=%i IV=%i\n",
- before(seq, sender->td_maxend + 1),
- after(end, sender->td_end - receiver->td_maxwin - 1),
- before(sack, receiver->td_end + 1),
- after(ack, receiver->td_end - MAXACKWINDOW(sender)));
-
- if (before(seq, sender->td_maxend + 1) &&
- after(end, sender->td_end - receiver->td_maxwin - 1) &&
- before(sack, receiver->td_end + 1) &&
- after(ack, receiver->td_end - MAXACKWINDOW(sender))) {
- /*
- * Take into account window scaling (RFC 1323).
- */
- if (!tcph->syn)
- win <<= sender->td_scale;
-
- /*
- * Update sender data.
- */
- swin = win + (sack - ack);
- if (sender->td_maxwin < swin)
- sender->td_maxwin = swin;
- if (after(end, sender->td_end))
- sender->td_end = end;
- /*
- * Update receiver data.
- */
- if (after(end, sender->td_maxend))
- receiver->td_maxwin += end - sender->td_maxend;
- if (after(sack + win, receiver->td_maxend - 1)) {
- receiver->td_maxend = sack + win;
- if (win == 0)
- receiver->td_maxend++;
- }
-
- /*
- * Check retransmissions.
- */
- if (index == TCP_ACK_SET) {
- if (state->last_dir == dir
- && state->last_seq == seq
- && state->last_ack == ack
- && state->last_end == end
- && state->last_win == win)
- state->retrans++;
- else {
- state->last_dir = dir;
- state->last_seq = seq;
- state->last_ack = ack;
- state->last_end = end;
- state->last_win = win;
- state->retrans = 0;
- }
- }
- res = 1;
- } else {
- res = 0;
- if (sender->flags & IP_CT_TCP_FLAG_BE_LIBERAL ||
- ip_ct_tcp_be_liberal)
- res = 1;
- if (!res && LOG_INVALID(IPPROTO_TCP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
- "ip_ct_tcp: %s ",
- before(seq, sender->td_maxend + 1) ?
- after(end, sender->td_end - receiver->td_maxwin - 1) ?
- before(sack, receiver->td_end + 1) ?
- after(ack, receiver->td_end - MAXACKWINDOW(sender)) ? "BUG"
- : "ACK is under the lower bound (possible overly delayed ACK)"
- : "ACK is over the upper bound (ACKed data not seen yet)"
- : "SEQ is under the lower bound (already ACKed data retransmitted)"
- : "SEQ is over the upper bound (over the window of the receiver)");
- }
-
- DEBUGP("tcp_in_window: res=%i sender end=%u maxend=%u maxwin=%u "
- "receiver end=%u maxend=%u maxwin=%u\n",
- res, sender->td_end, sender->td_maxend, sender->td_maxwin,
- receiver->td_end, receiver->td_maxend, receiver->td_maxwin);
-
- return res;
-}
-
-#ifdef CONFIG_IP_NF_NAT_NEEDED
-/* Update sender->td_end after NAT successfully mangled the packet */
-void ip_conntrack_tcp_update(struct sk_buff *skb,
- struct ip_conntrack *conntrack,
- enum ip_conntrack_dir dir)
-{
- struct iphdr *iph = ip_hdr(skb);
- struct tcphdr *tcph = (void *)iph + ip_hdrlen(skb);
- __u32 end;
-#ifdef DEBUGP_VARS
- struct ip_ct_tcp_state *sender = &conntrack->proto.tcp.seen[dir];
- struct ip_ct_tcp_state *receiver = &conntrack->proto.tcp.seen[!dir];
-#endif
-
- end = segment_seq_plus_len(ntohl(tcph->seq), skb->len, iph, tcph);
-
- write_lock_bh(&tcp_lock);
- /*
- * We have to worry for the ack in the reply packet only...
- */
- if (after(end, conntrack->proto.tcp.seen[dir].td_end))
- conntrack->proto.tcp.seen[dir].td_end = end;
- conntrack->proto.tcp.last_end = end;
- write_unlock_bh(&tcp_lock);
- DEBUGP("tcp_update: sender end=%u maxend=%u maxwin=%u scale=%i "
- "receiver end=%u maxend=%u maxwin=%u scale=%i\n",
- sender->td_end, sender->td_maxend, sender->td_maxwin,
- sender->td_scale,
- receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
- receiver->td_scale);
-}
-
-#endif
-
-#define TH_FIN 0x01
-#define TH_SYN 0x02
-#define TH_RST 0x04
-#define TH_PUSH 0x08
-#define TH_ACK 0x10
-#define TH_URG 0x20
-#define TH_ECE 0x40
-#define TH_CWR 0x80
-
-/* table of valid flag combinations - ECE and CWR are always valid */
-static const u8 tcp_valid_flags[(TH_FIN|TH_SYN|TH_RST|TH_PUSH|TH_ACK|TH_URG) + 1] =
-{
- [TH_SYN] = 1,
- [TH_SYN|TH_PUSH] = 1,
- [TH_SYN|TH_URG] = 1,
- [TH_SYN|TH_PUSH|TH_URG] = 1,
- [TH_SYN|TH_ACK] = 1,
- [TH_SYN|TH_ACK|TH_PUSH] = 1,
- [TH_RST] = 1,
- [TH_RST|TH_ACK] = 1,
- [TH_RST|TH_ACK|TH_PUSH] = 1,
- [TH_FIN|TH_ACK] = 1,
- [TH_ACK] = 1,
- [TH_ACK|TH_PUSH] = 1,
- [TH_ACK|TH_URG] = 1,
- [TH_ACK|TH_URG|TH_PUSH] = 1,
- [TH_FIN|TH_ACK|TH_PUSH] = 1,
- [TH_FIN|TH_ACK|TH_URG] = 1,
- [TH_FIN|TH_ACK|TH_URG|TH_PUSH] = 1,
-};
-
-/* Protect conntrack agaist broken packets. Code taken from ipt_unclean.c. */
-static int tcp_error(struct sk_buff *skb,
- enum ip_conntrack_info *ctinfo,
- unsigned int hooknum)
-{
- const unsigned int hdrlen = ip_hdrlen(skb);
- struct tcphdr _tcph, *th;
- unsigned int tcplen = skb->len - hdrlen;
- u_int8_t tcpflags;
-
- /* Smaller that minimal TCP header? */
- th = skb_header_pointer(skb, hdrlen,
- sizeof(_tcph), &_tcph);
- if (th == NULL) {
- if (LOG_INVALID(IPPROTO_TCP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
- "ip_ct_tcp: short packet ");
- return -NF_ACCEPT;
- }
-
- /* Not whole TCP header or malformed packet */
- if (th->doff*4 < sizeof(struct tcphdr) || tcplen < th->doff*4) {
- if (LOG_INVALID(IPPROTO_TCP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
- "ip_ct_tcp: truncated/malformed packet ");
- return -NF_ACCEPT;
- }
-
- /* Checksum invalid? Ignore.
- * We skip checking packets on the outgoing path
- * because it is assumed to be correct.
- */
- /* FIXME: Source route IP option packets --RR */
- if (ip_conntrack_checksum && hooknum == NF_IP_PRE_ROUTING &&
- nf_ip_checksum(skb, hooknum, hdrlen, IPPROTO_TCP)) {
- if (LOG_INVALID(IPPROTO_TCP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
- "ip_ct_tcp: bad TCP checksum ");
- return -NF_ACCEPT;
- }
-
- /* Check TCP flags. */
- tcpflags = (((u_int8_t *)th)[13] & ~(TH_ECE|TH_CWR));
- if (!tcp_valid_flags[tcpflags]) {
- if (LOG_INVALID(IPPROTO_TCP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
- "ip_ct_tcp: invalid TCP flag combination ");
- return -NF_ACCEPT;
- }
-
- return NF_ACCEPT;
-}
-
-/* Returns verdict for packet, or -1 for invalid. */
-static int tcp_packet(struct ip_conntrack *conntrack,
- const struct sk_buff *skb,
- enum ip_conntrack_info ctinfo)
-{
- enum tcp_conntrack new_state, old_state;
- enum ip_conntrack_dir dir;
- struct iphdr *iph = ip_hdr(skb);
- struct tcphdr *th, _tcph;
- unsigned long timeout;
- unsigned int index;
-
- th = skb_header_pointer(skb, iph->ihl * 4,
- sizeof(_tcph), &_tcph);
- BUG_ON(th == NULL);
-
- write_lock_bh(&tcp_lock);
- old_state = conntrack->proto.tcp.state;
- dir = CTINFO2DIR(ctinfo);
- index = get_conntrack_index(th);
- new_state = tcp_conntracks[dir][index][old_state];
-
- switch (new_state) {
- case TCP_CONNTRACK_IGNORE:
- /* Ignored packets:
- *
- * a) SYN in ORIGINAL
- * b) SYN/ACK in REPLY
- * c) ACK in reply direction after initial SYN in original.
- */
- if (index == TCP_SYNACK_SET
- && conntrack->proto.tcp.last_index == TCP_SYN_SET
- && conntrack->proto.tcp.last_dir != dir
- && ntohl(th->ack_seq) ==
- conntrack->proto.tcp.last_end) {
- /* This SYN/ACK acknowledges a SYN that we earlier
- * ignored as invalid. This means that the client and
- * the server are both in sync, while the firewall is
- * not. We kill this session and block the SYN/ACK so
- * that the client cannot but retransmit its SYN and
- * thus initiate a clean new session.
- */
- write_unlock_bh(&tcp_lock);
- if (LOG_INVALID(IPPROTO_TCP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL,
- NULL, "ip_ct_tcp: "
- "killing out of sync session ");
- if (del_timer(&conntrack->timeout))
- conntrack->timeout.function((unsigned long)
- conntrack);
- return -NF_DROP;
- }
- conntrack->proto.tcp.last_index = index;
- conntrack->proto.tcp.last_dir = dir;
- conntrack->proto.tcp.last_seq = ntohl(th->seq);
- conntrack->proto.tcp.last_end =
- segment_seq_plus_len(ntohl(th->seq), skb->len, iph, th);
-
- write_unlock_bh(&tcp_lock);
- if (LOG_INVALID(IPPROTO_TCP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
- "ip_ct_tcp: invalid packet ignored ");
- return NF_ACCEPT;
- case TCP_CONNTRACK_MAX:
- /* Invalid packet */
- DEBUGP("ip_ct_tcp: Invalid dir=%i index=%u ostate=%u\n",
- dir, get_conntrack_index(th),
- old_state);
- write_unlock_bh(&tcp_lock);
- if (LOG_INVALID(IPPROTO_TCP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
- "ip_ct_tcp: invalid state ");
- return -NF_ACCEPT;
- case TCP_CONNTRACK_SYN_SENT:
- if (old_state < TCP_CONNTRACK_TIME_WAIT)
- break;
- if ((conntrack->proto.tcp.seen[dir].flags &
- IP_CT_TCP_FLAG_CLOSE_INIT)
- || after(ntohl(th->seq),
- conntrack->proto.tcp.seen[dir].td_end)) {
- /* Attempt to reopen a closed connection.
- * Delete this connection and look up again. */
- write_unlock_bh(&tcp_lock);
- if (del_timer(&conntrack->timeout))
- conntrack->timeout.function((unsigned long)
- conntrack);
- return -NF_REPEAT;
- } else {
- write_unlock_bh(&tcp_lock);
- if (LOG_INVALID(IPPROTO_TCP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL,
- NULL, "ip_ct_tcp: invalid SYN");
- return -NF_ACCEPT;
- }
- case TCP_CONNTRACK_CLOSE:
- if (index == TCP_RST_SET
- && ((test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)
- && conntrack->proto.tcp.last_index == TCP_SYN_SET)
- || (!test_bit(IPS_ASSURED_BIT, &conntrack->status)
- && conntrack->proto.tcp.last_index == TCP_ACK_SET))
- && ntohl(th->ack_seq) == conntrack->proto.tcp.last_end) {
- /* RST sent to invalid SYN or ACK we had let through
- * at a) and c) above:
- *
- * a) SYN was in window then
- * c) we hold a half-open connection.
- *
- * Delete our connection entry.
- * We skip window checking, because packet might ACK
- * segments we ignored. */
- goto in_window;
- }
- /* Just fall through */
- default:
- /* Keep compilers happy. */
- break;
- }
-
- if (!tcp_in_window(&conntrack->proto.tcp, dir, index,
- skb, iph, th)) {
- write_unlock_bh(&tcp_lock);
- return -NF_ACCEPT;
- }
- in_window:
- /* From now on we have got in-window packets */
- conntrack->proto.tcp.last_index = index;
-
- DEBUGP("tcp_conntracks: src=%u.%u.%u.%u:%hu dst=%u.%u.%u.%u:%hu "
- "syn=%i ack=%i fin=%i rst=%i old=%i new=%i\n",
- NIPQUAD(iph->saddr), ntohs(th->source),
- NIPQUAD(iph->daddr), ntohs(th->dest),
- (th->syn ? 1 : 0), (th->ack ? 1 : 0),
- (th->fin ? 1 : 0), (th->rst ? 1 : 0),
- old_state, new_state);
-
- conntrack->proto.tcp.state = new_state;
- if (old_state != new_state
- && (new_state == TCP_CONNTRACK_FIN_WAIT
- || new_state == TCP_CONNTRACK_CLOSE))
- conntrack->proto.tcp.seen[dir].flags |= IP_CT_TCP_FLAG_CLOSE_INIT;
- timeout = conntrack->proto.tcp.retrans >= ip_ct_tcp_max_retrans
- && *tcp_timeouts[new_state] > ip_ct_tcp_timeout_max_retrans
- ? ip_ct_tcp_timeout_max_retrans : *tcp_timeouts[new_state];
- write_unlock_bh(&tcp_lock);
-
- ip_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);
- if (new_state != old_state)
- ip_conntrack_event_cache(IPCT_PROTOINFO, skb);
-
- if (!test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)) {
- /* If only reply is a RST, we can consider ourselves not to
- have an established connection: this is a fairly common
- problem case, so we can delete the conntrack
- immediately. --RR */
- if (th->rst) {
- if (del_timer(&conntrack->timeout))
- conntrack->timeout.function((unsigned long)
- conntrack);
- return NF_ACCEPT;
- }
- } else if (!test_bit(IPS_ASSURED_BIT, &conntrack->status)
- && (old_state == TCP_CONNTRACK_SYN_RECV
- || old_state == TCP_CONNTRACK_ESTABLISHED)
- && new_state == TCP_CONNTRACK_ESTABLISHED) {
- /* Set ASSURED if we see see valid ack in ESTABLISHED
- after SYN_RECV or a valid answer for a picked up
- connection. */
- set_bit(IPS_ASSURED_BIT, &conntrack->status);
- ip_conntrack_event_cache(IPCT_STATUS, skb);
- }
- ip_ct_refresh_acct(conntrack, ctinfo, skb, timeout);
-
- return NF_ACCEPT;
-}
-
-/* Called when a new connection for this protocol found. */
-static int tcp_new(struct ip_conntrack *conntrack,
- const struct sk_buff *skb)
-{
- enum tcp_conntrack new_state;
- struct iphdr *iph = ip_hdr(skb);
- struct tcphdr *th, _tcph;
-#ifdef DEBUGP_VARS
- struct ip_ct_tcp_state *sender = &conntrack->proto.tcp.seen[0];
- struct ip_ct_tcp_state *receiver = &conntrack->proto.tcp.seen[1];
-#endif
-
- th = skb_header_pointer(skb, iph->ihl * 4,
- sizeof(_tcph), &_tcph);
- BUG_ON(th == NULL);
-
- /* Don't need lock here: this conntrack not in circulation yet */
- new_state
- = tcp_conntracks[0][get_conntrack_index(th)]
- [TCP_CONNTRACK_NONE];
-
- /* Invalid: delete conntrack */
- if (new_state >= TCP_CONNTRACK_MAX) {
- DEBUGP("ip_ct_tcp: invalid new deleting.\n");
- return 0;
- }
-
- if (new_state == TCP_CONNTRACK_SYN_SENT) {
- /* SYN packet */
- conntrack->proto.tcp.seen[0].td_end =
- segment_seq_plus_len(ntohl(th->seq), skb->len,
- iph, th);
- conntrack->proto.tcp.seen[0].td_maxwin = ntohs(th->window);
- if (conntrack->proto.tcp.seen[0].td_maxwin == 0)
- conntrack->proto.tcp.seen[0].td_maxwin = 1;
- conntrack->proto.tcp.seen[0].td_maxend =
- conntrack->proto.tcp.seen[0].td_end;
-
- tcp_options(skb, iph, th, &conntrack->proto.tcp.seen[0]);
- conntrack->proto.tcp.seen[1].flags = 0;
- } else if (ip_ct_tcp_loose == 0) {
- /* Don't try to pick up connections. */
- return 0;
- } else {
- /*
- * We are in the middle of a connection,
- * its history is lost for us.
- * Let's try to use the data from the packet.
- */
- conntrack->proto.tcp.seen[0].td_end =
- segment_seq_plus_len(ntohl(th->seq), skb->len,
- iph, th);
- conntrack->proto.tcp.seen[0].td_maxwin = ntohs(th->window);
- if (conntrack->proto.tcp.seen[0].td_maxwin == 0)
- conntrack->proto.tcp.seen[0].td_maxwin = 1;
- conntrack->proto.tcp.seen[0].td_maxend =
- conntrack->proto.tcp.seen[0].td_end +
- conntrack->proto.tcp.seen[0].td_maxwin;
- conntrack->proto.tcp.seen[0].td_scale = 0;
-
- /* We assume SACK and liberal window checking to handle
- * window scaling */
- conntrack->proto.tcp.seen[0].flags =
- conntrack->proto.tcp.seen[1].flags = IP_CT_TCP_FLAG_SACK_PERM |
- IP_CT_TCP_FLAG_BE_LIBERAL;
- }
-
- conntrack->proto.tcp.seen[1].td_end = 0;
- conntrack->proto.tcp.seen[1].td_maxend = 0;
- conntrack->proto.tcp.seen[1].td_maxwin = 1;
- conntrack->proto.tcp.seen[1].td_scale = 0;
-
- /* tcp_packet will set them */
- conntrack->proto.tcp.state = TCP_CONNTRACK_NONE;
- conntrack->proto.tcp.last_index = TCP_NONE_SET;
-
- DEBUGP("tcp_new: sender end=%u maxend=%u maxwin=%u scale=%i "
- "receiver end=%u maxend=%u maxwin=%u scale=%i\n",
- sender->td_end, sender->td_maxend, sender->td_maxwin,
- sender->td_scale,
- receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
- receiver->td_scale);
- return 1;
-}
-
-struct ip_conntrack_protocol ip_conntrack_protocol_tcp =
-{
- .proto = IPPROTO_TCP,
- .name = "tcp",
- .pkt_to_tuple = tcp_pkt_to_tuple,
- .invert_tuple = tcp_invert_tuple,
- .print_tuple = tcp_print_tuple,
- .print_conntrack = tcp_print_conntrack,
- .packet = tcp_packet,
- .new = tcp_new,
- .error = tcp_error,
-#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
- defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
- .to_nfattr = tcp_to_nfattr,
- .from_nfattr = nfattr_to_tcp,
- .tuple_to_nfattr = ip_ct_port_tuple_to_nfattr,
- .nfattr_to_tuple = ip_ct_port_nfattr_to_tuple,
-#endif
-};
+++ /dev/null
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/types.h>
-#include <linux/timer.h>
-#include <linux/netfilter.h>
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/udp.h>
-#include <linux/seq_file.h>
-#include <net/checksum.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
-
-unsigned int ip_ct_udp_timeout __read_mostly = 30*HZ;
-unsigned int ip_ct_udp_timeout_stream __read_mostly = 180*HZ;
-
-static int udp_pkt_to_tuple(const struct sk_buff *skb,
- unsigned int dataoff,
- struct ip_conntrack_tuple *tuple)
-{
- struct udphdr _hdr, *hp;
-
- /* Actually only need first 8 bytes. */
- hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
- if (hp == NULL)
- return 0;
-
- tuple->src.u.udp.port = hp->source;
- tuple->dst.u.udp.port = hp->dest;
-
- return 1;
-}
-
-static int udp_invert_tuple(struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack_tuple *orig)
-{
- tuple->src.u.udp.port = orig->dst.u.udp.port;
- tuple->dst.u.udp.port = orig->src.u.udp.port;
- return 1;
-}
-
-/* Print out the per-protocol part of the tuple. */
-static int udp_print_tuple(struct seq_file *s,
- const struct ip_conntrack_tuple *tuple)
-{
- return seq_printf(s, "sport=%hu dport=%hu ",
- ntohs(tuple->src.u.udp.port),
- ntohs(tuple->dst.u.udp.port));
-}
-
-/* Print out the private part of the conntrack. */
-static int udp_print_conntrack(struct seq_file *s,
- const struct ip_conntrack *conntrack)
-{
- return 0;
-}
-
-/* Returns verdict for packet, and may modify conntracktype */
-static int udp_packet(struct ip_conntrack *conntrack,
- const struct sk_buff *skb,
- enum ip_conntrack_info ctinfo)
-{
- /* If we've seen traffic both ways, this is some kind of UDP
- stream. Extend timeout. */
- if (test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)) {
- ip_ct_refresh_acct(conntrack, ctinfo, skb,
- ip_ct_udp_timeout_stream);
- /* Also, more likely to be important, and not a probe */
- if (!test_and_set_bit(IPS_ASSURED_BIT, &conntrack->status))
- ip_conntrack_event_cache(IPCT_STATUS, skb);
- } else
- ip_ct_refresh_acct(conntrack, ctinfo, skb, ip_ct_udp_timeout);
-
- return NF_ACCEPT;
-}
-
-/* Called when a new connection for this protocol found. */
-static int udp_new(struct ip_conntrack *conntrack, const struct sk_buff *skb)
-{
- return 1;
-}
-
-static int udp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
- unsigned int hooknum)
-{
- const unsigned int hdrlen = ip_hdrlen(skb);
- unsigned int udplen = skb->len - hdrlen;
- struct udphdr _hdr, *hdr;
-
- /* Header is too small? */
- hdr = skb_header_pointer(skb, hdrlen, sizeof(_hdr), &_hdr);
- if (hdr == NULL) {
- if (LOG_INVALID(IPPROTO_UDP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
- "ip_ct_udp: short packet ");
- return -NF_ACCEPT;
- }
-
- /* Truncated/malformed packets */
- if (ntohs(hdr->len) > udplen || ntohs(hdr->len) < sizeof(*hdr)) {
- if (LOG_INVALID(IPPROTO_UDP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
- "ip_ct_udp: truncated/malformed packet ");
- return -NF_ACCEPT;
- }
-
- /* Packet with no checksum */
- if (!hdr->check)
- return NF_ACCEPT;
-
- /* Checksum invalid? Ignore.
- * We skip checking packets on the outgoing path
- * because the checksum is assumed to be correct.
- * FIXME: Source route IP option packets --RR */
- if (ip_conntrack_checksum && hooknum == NF_IP_PRE_ROUTING &&
- nf_ip_checksum(skb, hooknum, hdrlen, IPPROTO_UDP)) {
- if (LOG_INVALID(IPPROTO_UDP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
- "ip_ct_udp: bad UDP checksum ");
- return -NF_ACCEPT;
- }
-
- return NF_ACCEPT;
-}
-
-struct ip_conntrack_protocol ip_conntrack_protocol_udp =
-{
- .proto = IPPROTO_UDP,
- .name = "udp",
- .pkt_to_tuple = udp_pkt_to_tuple,
- .invert_tuple = udp_invert_tuple,
- .print_tuple = udp_print_tuple,
- .print_conntrack = udp_print_conntrack,
- .packet = udp_packet,
- .new = udp_new,
- .error = udp_error,
-#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
- defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
- .tuple_to_nfattr = ip_ct_port_tuple_to_nfattr,
- .nfattr_to_tuple = ip_ct_port_nfattr_to_tuple,
-#endif
-};
+++ /dev/null
-/* SIP extension for IP connection tracking.
- *
- * (C) 2005 by Christian Hentschel <chentschel@arnet.com.ar>
- * based on RR's ip_conntrack_ftp.c and other modules.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/module.h>
-#include <linux/ctype.h>
-#include <linux/skbuff.h>
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/udp.h>
-
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_sip.h>
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Christian Hentschel <chentschel@arnet.com.ar>");
-MODULE_DESCRIPTION("SIP connection tracking helper");
-
-#define MAX_PORTS 8
-static unsigned short ports[MAX_PORTS];
-static int ports_c;
-module_param_array(ports, ushort, &ports_c, 0400);
-MODULE_PARM_DESC(ports, "port numbers of sip servers");
-
-static unsigned int sip_timeout = SIP_TIMEOUT;
-module_param(sip_timeout, uint, 0600);
-MODULE_PARM_DESC(sip_timeout, "timeout for the master SIP session");
-
-unsigned int (*ip_nat_sip_hook)(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- struct ip_conntrack *ct,
- const char **dptr);
-EXPORT_SYMBOL_GPL(ip_nat_sip_hook);
-
-unsigned int (*ip_nat_sdp_hook)(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- struct ip_conntrack_expect *exp,
- const char *dptr);
-EXPORT_SYMBOL_GPL(ip_nat_sdp_hook);
-
-static int digits_len(const char *dptr, const char *limit, int *shift);
-static int epaddr_len(const char *dptr, const char *limit, int *shift);
-static int skp_digits_len(const char *dptr, const char *limit, int *shift);
-static int skp_epaddr_len(const char *dptr, const char *limit, int *shift);
-
-struct sip_header_nfo {
- const char *lname;
- const char *sname;
- const char *ln_str;
- size_t lnlen;
- size_t snlen;
- size_t ln_strlen;
- int case_sensitive;
- int (*match_len)(const char *, const char *, int *);
-};
-
-static struct sip_header_nfo ct_sip_hdrs[] = {
- [POS_REG_REQ_URI] = { /* SIP REGISTER request URI */
- .lname = "sip:",
- .lnlen = sizeof("sip:") - 1,
- .ln_str = ":",
- .ln_strlen = sizeof(":") - 1,
- .match_len = epaddr_len
- },
- [POS_REQ_URI] = { /* SIP request URI */
- .lname = "sip:",
- .lnlen = sizeof("sip:") - 1,
- .ln_str = "@",
- .ln_strlen = sizeof("@") - 1,
- .match_len = epaddr_len
- },
- [POS_FROM] = { /* SIP From header */
- .lname = "From:",
- .lnlen = sizeof("From:") - 1,
- .sname = "\r\nf:",
- .snlen = sizeof("\r\nf:") - 1,
- .ln_str = "sip:",
- .ln_strlen = sizeof("sip:") - 1,
- .match_len = skp_epaddr_len,
- },
- [POS_TO] = { /* SIP To header */
- .lname = "To:",
- .lnlen = sizeof("To:") - 1,
- .sname = "\r\nt:",
- .snlen = sizeof("\r\nt:") - 1,
- .ln_str = "sip:",
- .ln_strlen = sizeof("sip:") - 1,
- .match_len = skp_epaddr_len,
- },
- [POS_VIA] = { /* SIP Via header */
- .lname = "Via:",
- .lnlen = sizeof("Via:") - 1,
- .sname = "\r\nv:",
- .snlen = sizeof("\r\nv:") - 1, /* rfc3261 "\r\n" */
- .ln_str = "UDP ",
- .ln_strlen = sizeof("UDP ") - 1,
- .match_len = epaddr_len,
- },
- [POS_CONTACT] = { /* SIP Contact header */
- .lname = "Contact:",
- .lnlen = sizeof("Contact:") - 1,
- .sname = "\r\nm:",
- .snlen = sizeof("\r\nm:") - 1,
- .ln_str = "sip:",
- .ln_strlen = sizeof("sip:") - 1,
- .match_len = skp_epaddr_len
- },
- [POS_CONTENT] = { /* SIP Content length header */
- .lname = "Content-Length:",
- .lnlen = sizeof("Content-Length:") - 1,
- .sname = "\r\nl:",
- .snlen = sizeof("\r\nl:") - 1,
- .ln_str = ":",
- .ln_strlen = sizeof(":") - 1,
- .match_len = skp_digits_len
- },
- [POS_MEDIA] = { /* SDP media info */
- .case_sensitive = 1,
- .lname = "\nm=",
- .lnlen = sizeof("\nm=") - 1,
- .sname = "\rm=",
- .snlen = sizeof("\rm=") - 1,
- .ln_str = "audio ",
- .ln_strlen = sizeof("audio ") - 1,
- .match_len = digits_len
- },
- [POS_OWNER] = { /* SDP owner address*/
- .case_sensitive = 1,
- .lname = "\no=",
- .lnlen = sizeof("\no=") - 1,
- .sname = "\ro=",
- .snlen = sizeof("\ro=") - 1,
- .ln_str = "IN IP4 ",
- .ln_strlen = sizeof("IN IP4 ") - 1,
- .match_len = epaddr_len
- },
- [POS_CONNECTION] = { /* SDP connection info */
- .case_sensitive = 1,
- .lname = "\nc=",
- .lnlen = sizeof("\nc=") - 1,
- .sname = "\rc=",
- .snlen = sizeof("\rc=") - 1,
- .ln_str = "IN IP4 ",
- .ln_strlen = sizeof("IN IP4 ") - 1,
- .match_len = epaddr_len
- },
- [POS_SDP_HEADER] = { /* SDP version header */
- .case_sensitive = 1,
- .lname = "\nv=",
- .lnlen = sizeof("\nv=") - 1,
- .sname = "\rv=",
- .snlen = sizeof("\rv=") - 1,
- .ln_str = "=",
- .ln_strlen = sizeof("=") - 1,
- .match_len = digits_len
- }
-};
-
-/* get line lenght until first CR or LF seen. */
-int ct_sip_lnlen(const char *line, const char *limit)
-{
- const char *k = line;
-
- while ((line <= limit) && (*line == '\r' || *line == '\n'))
- line++;
-
- while (line <= limit) {
- if (*line == '\r' || *line == '\n')
- break;
- line++;
- }
- return line - k;
-}
-EXPORT_SYMBOL_GPL(ct_sip_lnlen);
-
-/* Linear string search, case sensitive. */
-const char *ct_sip_search(const char *needle, const char *haystack,
- size_t needle_len, size_t haystack_len,
- int case_sensitive)
-{
- const char *limit = haystack + (haystack_len - needle_len);
-
- while (haystack <= limit) {
- if (case_sensitive) {
- if (strncmp(haystack, needle, needle_len) == 0)
- return haystack;
- } else {
- if (strnicmp(haystack, needle, needle_len) == 0)
- return haystack;
- }
- haystack++;
- }
- return NULL;
-}
-EXPORT_SYMBOL_GPL(ct_sip_search);
-
-static int digits_len(const char *dptr, const char *limit, int *shift)
-{
- int len = 0;
- while (dptr <= limit && isdigit(*dptr)) {
- dptr++;
- len++;
- }
- return len;
-}
-
-/* get digits lenght, skiping blank spaces. */
-static int skp_digits_len(const char *dptr, const char *limit, int *shift)
-{
- for (; dptr <= limit && *dptr == ' '; dptr++)
- (*shift)++;
-
- return digits_len(dptr, limit, shift);
-}
-
-/* Simple ipaddr parser.. */
-static int parse_ipaddr(const char *cp, const char **endp,
- __be32 *ipaddr, const char *limit)
-{
- unsigned long int val;
- int i, digit = 0;
-
- for (i = 0, *ipaddr = 0; cp <= limit && i < 4; i++) {
- digit = 0;
- if (!isdigit(*cp))
- break;
-
- val = simple_strtoul(cp, (char **)&cp, 10);
- if (val > 0xFF)
- return -1;
-
- ((u_int8_t *)ipaddr)[i] = val;
- digit = 1;
-
- if (*cp != '.')
- break;
- cp++;
- }
- if (!digit)
- return -1;
-
- if (endp)
- *endp = cp;
-
- return 0;
-}
-
-/* skip ip address. returns it lenght. */
-static int epaddr_len(const char *dptr, const char *limit, int *shift)
-{
- const char *aux = dptr;
- __be32 ip;
-
- if (parse_ipaddr(dptr, &dptr, &ip, limit) < 0) {
- DEBUGP("ip: %s parse failed.!\n", dptr);
- return 0;
- }
-
- /* Port number */
- if (*dptr == ':') {
- dptr++;
- dptr += digits_len(dptr, limit, shift);
- }
- return dptr - aux;
-}
-
-/* get address length, skiping user info. */
-static int skp_epaddr_len(const char *dptr, const char *limit, int *shift)
-{
- int s = *shift;
-
- /* Search for @, but stop at the end of the line.
- * We are inside a sip: URI, so we don't need to worry about
- * continuation lines. */
- while (dptr <= limit &&
- *dptr != '@' && *dptr != '\r' && *dptr != '\n') {
- (*shift)++;
- dptr++;
- }
-
- if (dptr <= limit && *dptr == '@') {
- dptr++;
- (*shift)++;
- } else
- *shift = s;
-
- return epaddr_len(dptr, limit, shift);
-}
-
-/* Returns 0 if not found, -1 error parsing. */
-int ct_sip_get_info(const char *dptr, size_t dlen,
- unsigned int *matchoff,
- unsigned int *matchlen,
- enum sip_header_pos pos)
-{
- struct sip_header_nfo *hnfo = &ct_sip_hdrs[pos];
- const char *limit, *aux, *k = dptr;
- int shift = 0;
-
- limit = dptr + (dlen - hnfo->lnlen);
-
- while (dptr <= limit) {
- if ((strncmp(dptr, hnfo->lname, hnfo->lnlen) != 0) &&
- (hnfo->sname == NULL ||
- strncmp(dptr, hnfo->sname, hnfo->snlen) != 0)) {
- dptr++;
- continue;
- }
- aux = ct_sip_search(hnfo->ln_str, dptr, hnfo->ln_strlen,
- ct_sip_lnlen(dptr, limit),
- hnfo->case_sensitive);
- if (!aux) {
- DEBUGP("'%s' not found in '%s'.\n", hnfo->ln_str,
- hnfo->lname);
- return -1;
- }
- aux += hnfo->ln_strlen;
-
- *matchlen = hnfo->match_len(aux, limit, &shift);
- if (!*matchlen)
- return -1;
-
- *matchoff = (aux - k) + shift;
-
- DEBUGP("%s match succeeded! - len: %u\n", hnfo->lname,
- *matchlen);
- return 1;
- }
- DEBUGP("%s header not found.\n", hnfo->lname);
- return 0;
-}
-EXPORT_SYMBOL_GPL(ct_sip_get_info);
-
-static int set_expected_rtp(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- __be32 ipaddr, u_int16_t port,
- const char *dptr)
-{
- struct ip_conntrack_expect *exp;
- enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
- int ret;
- typeof(ip_nat_sdp_hook) ip_nat_sdp;
-
- exp = ip_conntrack_expect_alloc(ct);
- if (exp == NULL)
- return NF_DROP;
-
- exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
- exp->tuple.src.u.udp.port = 0;
- exp->tuple.dst.ip = ipaddr;
- exp->tuple.dst.u.udp.port = htons(port);
- exp->tuple.dst.protonum = IPPROTO_UDP;
-
- exp->mask.src.ip = htonl(0xFFFFFFFF);
- exp->mask.src.u.udp.port = 0;
- exp->mask.dst.ip = htonl(0xFFFFFFFF);
- exp->mask.dst.u.udp.port = htons(0xFFFF);
- exp->mask.dst.protonum = 0xFF;
-
- exp->expectfn = NULL;
- exp->flags = 0;
-
- ip_nat_sdp = rcu_dereference(ip_nat_sdp_hook);
- if (ip_nat_sdp)
- ret = ip_nat_sdp(pskb, ctinfo, exp, dptr);
- else {
- if (ip_conntrack_expect_related(exp) != 0)
- ret = NF_DROP;
- else
- ret = NF_ACCEPT;
- }
- ip_conntrack_expect_put(exp);
-
- return ret;
-}
-
-static int sip_help(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo)
-{
- unsigned int dataoff, datalen;
- const char *dptr;
- int ret = NF_ACCEPT;
- int matchoff, matchlen;
- __be32 ipaddr;
- u_int16_t port;
- typeof(ip_nat_sip_hook) ip_nat_sip;
-
- /* No Data ? */
- dataoff = ip_hdrlen(*pskb) + sizeof(struct udphdr);
- if (dataoff >= (*pskb)->len) {
- DEBUGP("skb->len = %u\n", (*pskb)->len);
- return NF_ACCEPT;
- }
-
- ip_ct_refresh(ct, *pskb, sip_timeout * HZ);
-
- if (!skb_is_nonlinear(*pskb))
- dptr = (*pskb)->data + dataoff;
- else {
- DEBUGP("Copy of skbuff not supported yet.\n");
- goto out;
- }
-
- ip_nat_sip = rcu_dereference(ip_nat_sip_hook);
- if (ip_nat_sip) {
- if (!ip_nat_sip(pskb, ctinfo, ct, &dptr)) {
- ret = NF_DROP;
- goto out;
- }
- }
-
- /* After this point NAT, could have mangled skb, so
- we need to recalculate payload lenght. */
- datalen = (*pskb)->len - dataoff;
-
- if (datalen < (sizeof("SIP/2.0 200") - 1))
- goto out;
-
- /* RTP info only in some SDP pkts */
- if (memcmp(dptr, "INVITE", sizeof("INVITE") - 1) != 0 &&
- memcmp(dptr, "SIP/2.0 200", sizeof("SIP/2.0 200") - 1) != 0) {
- goto out;
- }
- /* Get ip and port address from SDP packet. */
- if (ct_sip_get_info(dptr, datalen, &matchoff, &matchlen,
- POS_CONNECTION) > 0) {
-
- /* We'll drop only if there are parse problems. */
- if (parse_ipaddr(dptr + matchoff, NULL, &ipaddr,
- dptr + datalen) < 0) {
- ret = NF_DROP;
- goto out;
- }
- if (ct_sip_get_info(dptr, datalen, &matchoff, &matchlen,
- POS_MEDIA) > 0) {
-
- port = simple_strtoul(dptr + matchoff, NULL, 10);
- if (port < 1024) {
- ret = NF_DROP;
- goto out;
- }
- ret = set_expected_rtp(pskb, ct, ctinfo,
- ipaddr, port, dptr);
- }
- }
-out:
- return ret;
-}
-
-static struct ip_conntrack_helper sip[MAX_PORTS];
-static char sip_names[MAX_PORTS][10];
-
-static void fini(void)
-{
- int i;
- for (i = 0; i < ports_c; i++) {
- DEBUGP("unregistering helper for port %d\n", ports[i]);
- ip_conntrack_helper_unregister(&sip[i]);
- }
-}
-
-static int __init init(void)
-{
- int i, ret;
- char *tmpname;
-
- if (ports_c == 0)
- ports[ports_c++] = SIP_PORT;
-
- for (i = 0; i < ports_c; i++) {
- /* Create helper structure */
- memset(&sip[i], 0, sizeof(struct ip_conntrack_helper));
-
- sip[i].tuple.dst.protonum = IPPROTO_UDP;
- sip[i].tuple.src.u.udp.port = htons(ports[i]);
- sip[i].mask.src.u.udp.port = htons(0xFFFF);
- sip[i].mask.dst.protonum = 0xFF;
- sip[i].max_expected = 2;
- sip[i].timeout = 3 * 60; /* 3 minutes */
- sip[i].me = THIS_MODULE;
- sip[i].help = sip_help;
-
- tmpname = &sip_names[i][0];
- if (ports[i] == SIP_PORT)
- sprintf(tmpname, "sip");
- else
- sprintf(tmpname, "sip-%d", i);
- sip[i].name = tmpname;
-
- DEBUGP("port #%d: %d\n", i, ports[i]);
-
- ret = ip_conntrack_helper_register(&sip[i]);
- if (ret) {
- printk("ERROR registering helper for port %d\n",
- ports[i]);
- fini();
- return ret;
- }
- }
- return 0;
-}
-
-module_init(init);
-module_exit(fini);
+++ /dev/null
-/* This file contains all the functions required for the standalone
- ip_conntrack module.
-
- These are not required by the compatibility layer.
-*/
-
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2005 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/types.h>
-#include <linux/ip.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <linux/percpu.h>
-#ifdef CONFIG_SYSCTL
-#include <linux/sysctl.h>
-#endif
-#include <net/checksum.h>
-#include <net/ip.h>
-#include <net/route.h>
-
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
-#include <linux/netfilter_ipv4/ip_conntrack_core.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-MODULE_LICENSE("GPL");
-
-extern atomic_t ip_conntrack_count;
-DECLARE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
-
-static int kill_proto(struct ip_conntrack *i, void *data)
-{
- return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum ==
- *((u_int8_t *) data));
-}
-
-#ifdef CONFIG_PROC_FS
-static int
-print_tuple(struct seq_file *s, const struct ip_conntrack_tuple *tuple,
- struct ip_conntrack_protocol *proto)
-{
- seq_printf(s, "src=%u.%u.%u.%u dst=%u.%u.%u.%u ",
- NIPQUAD(tuple->src.ip), NIPQUAD(tuple->dst.ip));
- return proto->print_tuple(s, tuple);
-}
-
-#ifdef CONFIG_IP_NF_CT_ACCT
-static unsigned int
-seq_print_counters(struct seq_file *s,
- const struct ip_conntrack_counter *counter)
-{
- return seq_printf(s, "packets=%llu bytes=%llu ",
- (unsigned long long)counter->packets,
- (unsigned long long)counter->bytes);
-}
-#else
-#define seq_print_counters(x, y) 0
-#endif
-
-struct ct_iter_state {
- unsigned int bucket;
-};
-
-static struct list_head *ct_get_first(struct seq_file *seq)
-{
- struct ct_iter_state *st = seq->private;
-
- for (st->bucket = 0;
- st->bucket < ip_conntrack_htable_size;
- st->bucket++) {
- if (!list_empty(&ip_conntrack_hash[st->bucket]))
- return ip_conntrack_hash[st->bucket].next;
- }
- return NULL;
-}
-
-static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
-{
- struct ct_iter_state *st = seq->private;
-
- head = head->next;
- while (head == &ip_conntrack_hash[st->bucket]) {
- if (++st->bucket >= ip_conntrack_htable_size)
- return NULL;
- head = ip_conntrack_hash[st->bucket].next;
- }
- return head;
-}
-
-static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
-{
- struct list_head *head = ct_get_first(seq);
-
- if (head)
- while (pos && (head = ct_get_next(seq, head)))
- pos--;
- return pos ? NULL : head;
-}
-
-static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
-{
- read_lock_bh(&ip_conntrack_lock);
- return ct_get_idx(seq, *pos);
-}
-
-static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
-{
- (*pos)++;
- return ct_get_next(s, v);
-}
-
-static void ct_seq_stop(struct seq_file *s, void *v)
-{
- read_unlock_bh(&ip_conntrack_lock);
-}
-
-static int ct_seq_show(struct seq_file *s, void *v)
-{
- const struct ip_conntrack_tuple_hash *hash = v;
- const struct ip_conntrack *conntrack = tuplehash_to_ctrack(hash);
- struct ip_conntrack_protocol *proto;
-
- IP_NF_ASSERT(conntrack);
-
- /* we only want to print DIR_ORIGINAL */
- if (DIRECTION(hash))
- return 0;
-
- proto = __ip_conntrack_proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
- IP_NF_ASSERT(proto);
-
- if (seq_printf(s, "%-8s %u %ld ",
- proto->name,
- conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
- timer_pending(&conntrack->timeout)
- ? (long)(conntrack->timeout.expires - jiffies)/HZ
- : 0) != 0)
- return -ENOSPC;
-
- if (proto->print_conntrack(s, conntrack))
- return -ENOSPC;
-
- if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
- proto))
- return -ENOSPC;
-
- if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
- return -ENOSPC;
-
- if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
- if (seq_printf(s, "[UNREPLIED] "))
- return -ENOSPC;
-
- if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
- proto))
- return -ENOSPC;
-
- if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
- return -ENOSPC;
-
- if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
- if (seq_printf(s, "[ASSURED] "))
- return -ENOSPC;
-
-#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
- if (seq_printf(s, "mark=%u ", conntrack->mark))
- return -ENOSPC;
-#endif
-
-#ifdef CONFIG_IP_NF_CONNTRACK_SECMARK
- if (seq_printf(s, "secmark=%u ", conntrack->secmark))
- return -ENOSPC;
-#endif
-
- if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
- return -ENOSPC;
-
- return 0;
-}
-
-static struct seq_operations ct_seq_ops = {
- .start = ct_seq_start,
- .next = ct_seq_next,
- .stop = ct_seq_stop,
- .show = ct_seq_show
-};
-
-static int ct_open(struct inode *inode, struct file *file)
-{
- struct seq_file *seq;
- struct ct_iter_state *st;
- int ret;
-
- st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
- if (st == NULL)
- return -ENOMEM;
- ret = seq_open(file, &ct_seq_ops);
- if (ret)
- goto out_free;
- seq = file->private_data;
- seq->private = st;
- memset(st, 0, sizeof(struct ct_iter_state));
- return ret;
-out_free:
- kfree(st);
- return ret;
-}
-
-static const struct file_operations ct_file_ops = {
- .owner = THIS_MODULE,
- .open = ct_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release_private,
-};
-
-/* expects */
-static void *exp_seq_start(struct seq_file *s, loff_t *pos)
-{
- struct list_head *e = &ip_conntrack_expect_list;
- loff_t i;
-
- /* strange seq_file api calls stop even if we fail,
- * thus we need to grab lock since stop unlocks */
- read_lock_bh(&ip_conntrack_lock);
-
- if (list_empty(e))
- return NULL;
-
- for (i = 0; i <= *pos; i++) {
- e = e->next;
- if (e == &ip_conntrack_expect_list)
- return NULL;
- }
- return e;
-}
-
-static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
-{
- struct list_head *e = v;
-
- ++*pos;
- e = e->next;
-
- if (e == &ip_conntrack_expect_list)
- return NULL;
-
- return e;
-}
-
-static void exp_seq_stop(struct seq_file *s, void *v)
-{
- read_unlock_bh(&ip_conntrack_lock);
-}
-
-static int exp_seq_show(struct seq_file *s, void *v)
-{
- struct ip_conntrack_expect *expect = v;
-
- if (expect->timeout.function)
- seq_printf(s, "%ld ", timer_pending(&expect->timeout)
- ? (long)(expect->timeout.expires - jiffies)/HZ : 0);
- else
- seq_printf(s, "- ");
-
- seq_printf(s, "proto=%u ", expect->tuple.dst.protonum);
-
- print_tuple(s, &expect->tuple,
- __ip_conntrack_proto_find(expect->tuple.dst.protonum));
- return seq_putc(s, '\n');
-}
-
-static struct seq_operations exp_seq_ops = {
- .start = exp_seq_start,
- .next = exp_seq_next,
- .stop = exp_seq_stop,
- .show = exp_seq_show
-};
-
-static int exp_open(struct inode *inode, struct file *file)
-{
- return seq_open(file, &exp_seq_ops);
-}
-
-static const struct file_operations exp_file_ops = {
- .owner = THIS_MODULE,
- .open = exp_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release
-};
-
-static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
-{
- int cpu;
-
- if (*pos == 0)
- return SEQ_START_TOKEN;
-
- for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
- if (!cpu_possible(cpu))
- continue;
- *pos = cpu+1;
- return &per_cpu(ip_conntrack_stat, cpu);
- }
-
- return NULL;
-}
-
-static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
-{
- int cpu;
-
- for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
- if (!cpu_possible(cpu))
- continue;
- *pos = cpu+1;
- return &per_cpu(ip_conntrack_stat, cpu);
- }
-
- return NULL;
-}
-
-static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
-{
-}
-
-static int ct_cpu_seq_show(struct seq_file *seq, void *v)
-{
- unsigned int nr_conntracks = atomic_read(&ip_conntrack_count);
- struct ip_conntrack_stat *st = v;
-
- if (v == SEQ_START_TOKEN) {
- seq_printf(seq, "entries searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error expect_new expect_create expect_delete\n");
- return 0;
- }
-
- seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x "
- "%08x %08x %08x %08x %08x %08x %08x %08x \n",
- nr_conntracks,
- st->searched,
- st->found,
- st->new,
- st->invalid,
- st->ignore,
- st->delete,
- st->delete_list,
- st->insert,
- st->insert_failed,
- st->drop,
- st->early_drop,
- st->error,
-
- st->expect_new,
- st->expect_create,
- st->expect_delete
- );
- return 0;
-}
-
-static struct seq_operations ct_cpu_seq_ops = {
- .start = ct_cpu_seq_start,
- .next = ct_cpu_seq_next,
- .stop = ct_cpu_seq_stop,
- .show = ct_cpu_seq_show,
-};
-
-static int ct_cpu_seq_open(struct inode *inode, struct file *file)
-{
- return seq_open(file, &ct_cpu_seq_ops);
-}
-
-static const struct file_operations ct_cpu_seq_fops = {
- .owner = THIS_MODULE,
- .open = ct_cpu_seq_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release_private,
-};
-#endif
-
-static unsigned int ip_confirm(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- /* We've seen it coming out the other side: confirm it */
- return ip_conntrack_confirm(pskb);
-}
-
-static unsigned int ip_conntrack_help(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
-
- /* This is where we call the helper: as the packet goes out. */
- ct = ip_conntrack_get(*pskb, &ctinfo);
- if (ct && ct->helper && ctinfo != IP_CT_RELATED + IP_CT_IS_REPLY) {
- unsigned int ret;
- ret = ct->helper->help(pskb, ct, ctinfo);
- if (ret != NF_ACCEPT)
- return ret;
- }
- return NF_ACCEPT;
-}
-
-static unsigned int ip_conntrack_defrag(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
-#if !defined(CONFIG_IP_NF_NAT) && !defined(CONFIG_IP_NF_NAT_MODULE)
- /* Previously seen (loopback)? Ignore. Do this before
- fragment check. */
- if ((*pskb)->nfct)
- return NF_ACCEPT;
-#endif
-
- /* Gather fragments. */
- if (ip_hdr(*pskb)->frag_off & htons(IP_MF | IP_OFFSET)) {
- *pskb = ip_ct_gather_frags(*pskb,
- hooknum == NF_IP_PRE_ROUTING ?
- IP_DEFRAG_CONNTRACK_IN :
- IP_DEFRAG_CONNTRACK_OUT);
- if (!*pskb)
- return NF_STOLEN;
- }
- return NF_ACCEPT;
-}
-
-static unsigned int ip_conntrack_local(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- /* root is playing with raw sockets. */
- if ((*pskb)->len < sizeof(struct iphdr)
- || ip_hdrlen(*pskb) < sizeof(struct iphdr)) {
- if (net_ratelimit())
- printk("ipt_hook: happy cracking.\n");
- return NF_ACCEPT;
- }
- return ip_conntrack_in(hooknum, pskb, in, out, okfn);
-}
-
-/* Connection tracking may drop packets, but never alters them, so
- make it the first hook. */
-static struct nf_hook_ops ip_conntrack_ops[] = {
- {
- .hook = ip_conntrack_defrag,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_PRE_ROUTING,
- .priority = NF_IP_PRI_CONNTRACK_DEFRAG,
- },
- {
- .hook = ip_conntrack_in,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_PRE_ROUTING,
- .priority = NF_IP_PRI_CONNTRACK,
- },
- {
- .hook = ip_conntrack_defrag,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_OUT,
- .priority = NF_IP_PRI_CONNTRACK_DEFRAG,
- },
- {
- .hook = ip_conntrack_local,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_OUT,
- .priority = NF_IP_PRI_CONNTRACK,
- },
- {
- .hook = ip_conntrack_help,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_POST_ROUTING,
- .priority = NF_IP_PRI_CONNTRACK_HELPER,
- },
- {
- .hook = ip_conntrack_help,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_IN,
- .priority = NF_IP_PRI_CONNTRACK_HELPER,
- },
- {
- .hook = ip_confirm,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_POST_ROUTING,
- .priority = NF_IP_PRI_CONNTRACK_CONFIRM,
- },
- {
- .hook = ip_confirm,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_IN,
- .priority = NF_IP_PRI_CONNTRACK_CONFIRM,
- },
-};
-
-/* Sysctl support */
-
-int ip_conntrack_checksum __read_mostly = 1;
-
-#ifdef CONFIG_SYSCTL
-
-/* From ip_conntrack_core.c */
-extern int ip_conntrack_max;
-extern unsigned int ip_conntrack_htable_size;
-
-/* From ip_conntrack_proto_tcp.c */
-extern unsigned int ip_ct_tcp_timeout_syn_sent;
-extern unsigned int ip_ct_tcp_timeout_syn_recv;
-extern unsigned int ip_ct_tcp_timeout_established;
-extern unsigned int ip_ct_tcp_timeout_fin_wait;
-extern unsigned int ip_ct_tcp_timeout_close_wait;
-extern unsigned int ip_ct_tcp_timeout_last_ack;
-extern unsigned int ip_ct_tcp_timeout_time_wait;
-extern unsigned int ip_ct_tcp_timeout_close;
-extern unsigned int ip_ct_tcp_timeout_max_retrans;
-extern int ip_ct_tcp_loose;
-extern int ip_ct_tcp_be_liberal;
-extern int ip_ct_tcp_max_retrans;
-
-/* From ip_conntrack_proto_udp.c */
-extern unsigned int ip_ct_udp_timeout;
-extern unsigned int ip_ct_udp_timeout_stream;
-
-/* From ip_conntrack_proto_icmp.c */
-extern unsigned int ip_ct_icmp_timeout;
-
-/* From ip_conntrack_proto_generic.c */
-extern unsigned int ip_ct_generic_timeout;
-
-/* Log invalid packets of a given protocol */
-static int log_invalid_proto_min = 0;
-static int log_invalid_proto_max = 255;
-
-static struct ctl_table_header *ip_ct_sysctl_header;
-
-static ctl_table ip_ct_sysctl_table[] = {
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_MAX,
- .procname = "ip_conntrack_max",
- .data = &ip_conntrack_max,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_COUNT,
- .procname = "ip_conntrack_count",
- .data = &ip_conntrack_count,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_BUCKETS,
- .procname = "ip_conntrack_buckets",
- .data = &ip_conntrack_htable_size,
- .maxlen = sizeof(unsigned int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_CHECKSUM,
- .procname = "ip_conntrack_checksum",
- .data = &ip_conntrack_checksum,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
- .procname = "ip_conntrack_tcp_timeout_syn_sent",
- .data = &ip_ct_tcp_timeout_syn_sent,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
- .procname = "ip_conntrack_tcp_timeout_syn_recv",
- .data = &ip_ct_tcp_timeout_syn_recv,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
- .procname = "ip_conntrack_tcp_timeout_established",
- .data = &ip_ct_tcp_timeout_established,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
- .procname = "ip_conntrack_tcp_timeout_fin_wait",
- .data = &ip_ct_tcp_timeout_fin_wait,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
- .procname = "ip_conntrack_tcp_timeout_close_wait",
- .data = &ip_ct_tcp_timeout_close_wait,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
- .procname = "ip_conntrack_tcp_timeout_last_ack",
- .data = &ip_ct_tcp_timeout_last_ack,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
- .procname = "ip_conntrack_tcp_timeout_time_wait",
- .data = &ip_ct_tcp_timeout_time_wait,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
- .procname = "ip_conntrack_tcp_timeout_close",
- .data = &ip_ct_tcp_timeout_close,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT,
- .procname = "ip_conntrack_udp_timeout",
- .data = &ip_ct_udp_timeout,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
- .procname = "ip_conntrack_udp_timeout_stream",
- .data = &ip_ct_udp_timeout_stream,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT,
- .procname = "ip_conntrack_icmp_timeout",
- .data = &ip_ct_icmp_timeout,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT,
- .procname = "ip_conntrack_generic_timeout",
- .data = &ip_ct_generic_timeout,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_LOG_INVALID,
- .procname = "ip_conntrack_log_invalid",
- .data = &ip_ct_log_invalid,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_minmax,
- .strategy = &sysctl_intvec,
- .extra1 = &log_invalid_proto_min,
- .extra2 = &log_invalid_proto_max,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
- .procname = "ip_conntrack_tcp_timeout_max_retrans",
- .data = &ip_ct_tcp_timeout_max_retrans,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_LOOSE,
- .procname = "ip_conntrack_tcp_loose",
- .data = &ip_ct_tcp_loose,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL,
- .procname = "ip_conntrack_tcp_be_liberal",
- .data = &ip_ct_tcp_be_liberal,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS,
- .procname = "ip_conntrack_tcp_max_retrans",
- .data = &ip_ct_tcp_max_retrans,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec,
- },
- { .ctl_name = 0 }
-};
-
-#define NET_IP_CONNTRACK_MAX 2089
-
-static ctl_table ip_ct_netfilter_table[] = {
- {
- .ctl_name = NET_IPV4_NETFILTER,
- .procname = "netfilter",
- .mode = 0555,
- .child = ip_ct_sysctl_table,
- },
- {
- .ctl_name = NET_IP_CONNTRACK_MAX,
- .procname = "ip_conntrack_max",
- .data = &ip_conntrack_max,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = &proc_dointvec
- },
- { .ctl_name = 0 }
-};
-
-static ctl_table ip_ct_ipv4_table[] = {
- {
- .ctl_name = NET_IPV4,
- .procname = "ipv4",
- .mode = 0555,
- .child = ip_ct_netfilter_table,
- },
- { .ctl_name = 0 }
-};
-
-static ctl_table ip_ct_net_table[] = {
- {
- .ctl_name = CTL_NET,
- .procname = "net",
- .mode = 0555,
- .child = ip_ct_ipv4_table,
- },
- { .ctl_name = 0 }
-};
-
-EXPORT_SYMBOL(ip_ct_log_invalid);
-#endif /* CONFIG_SYSCTL */
-
-/* FIXME: Allow NULL functions and sub in pointers to generic for
- them. --RR */
-int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto)
-{
- int ret = 0;
-
- write_lock_bh(&ip_conntrack_lock);
- if (ip_ct_protos[proto->proto] != &ip_conntrack_generic_protocol) {
- ret = -EBUSY;
- goto out;
- }
- rcu_assign_pointer(ip_ct_protos[proto->proto], proto);
- out:
- write_unlock_bh(&ip_conntrack_lock);
- return ret;
-}
-
-void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto)
-{
- write_lock_bh(&ip_conntrack_lock);
- rcu_assign_pointer(ip_ct_protos[proto->proto],
- &ip_conntrack_generic_protocol);
- write_unlock_bh(&ip_conntrack_lock);
- synchronize_rcu();
-
- /* Remove all contrack entries for this protocol */
- ip_ct_iterate_cleanup(kill_proto, &proto->proto);
-}
-
-static int __init ip_conntrack_standalone_init(void)
-{
-#ifdef CONFIG_PROC_FS
- struct proc_dir_entry *proc, *proc_exp, *proc_stat;
-#endif
- int ret = 0;
-
- ret = ip_conntrack_init();
- if (ret < 0)
- return ret;
-
-#ifdef CONFIG_PROC_FS
- ret = -ENOMEM;
- proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
- if (!proc) goto cleanup_init;
-
- proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
- &exp_file_ops);
- if (!proc_exp) goto cleanup_proc;
-
- proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
- if (!proc_stat)
- goto cleanup_proc_exp;
-
- proc_stat->proc_fops = &ct_cpu_seq_fops;
- proc_stat->owner = THIS_MODULE;
-#endif
-
- ret = nf_register_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
- if (ret < 0) {
- printk("ip_conntrack: can't register hooks.\n");
- goto cleanup_proc_stat;
- }
-#ifdef CONFIG_SYSCTL
- ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table);
- if (ip_ct_sysctl_header == NULL) {
- printk("ip_conntrack: can't register to sysctl.\n");
- ret = -ENOMEM;
- goto cleanup_hooks;
- }
-#endif
- return ret;
-
-#ifdef CONFIG_SYSCTL
- cleanup_hooks:
- nf_unregister_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
-#endif
- cleanup_proc_stat:
-#ifdef CONFIG_PROC_FS
- remove_proc_entry("ip_conntrack", proc_net_stat);
- cleanup_proc_exp:
- proc_net_remove("ip_conntrack_expect");
- cleanup_proc:
- proc_net_remove("ip_conntrack");
- cleanup_init:
-#endif /* CONFIG_PROC_FS */
- ip_conntrack_cleanup();
- return ret;
-}
-
-static void __exit ip_conntrack_standalone_fini(void)
-{
- synchronize_net();
-#ifdef CONFIG_SYSCTL
- unregister_sysctl_table(ip_ct_sysctl_header);
-#endif
- nf_unregister_hooks(ip_conntrack_ops, ARRAY_SIZE(ip_conntrack_ops));
-#ifdef CONFIG_PROC_FS
- remove_proc_entry("ip_conntrack", proc_net_stat);
- proc_net_remove("ip_conntrack_expect");
- proc_net_remove("ip_conntrack");
-#endif /* CONFIG_PROC_FS */
- ip_conntrack_cleanup();
-}
-
-module_init(ip_conntrack_standalone_init);
-module_exit(ip_conntrack_standalone_fini);
-
-/* Some modules need us, but don't depend directly on any symbol.
- They should call this. */
-void need_conntrack(void)
-{
-}
-
-#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
-EXPORT_SYMBOL_GPL(ip_conntrack_chain);
-EXPORT_SYMBOL_GPL(ip_conntrack_expect_chain);
-EXPORT_SYMBOL_GPL(ip_conntrack_register_notifier);
-EXPORT_SYMBOL_GPL(ip_conntrack_unregister_notifier);
-EXPORT_SYMBOL_GPL(__ip_ct_event_cache_init);
-EXPORT_PER_CPU_SYMBOL_GPL(ip_conntrack_ecache);
-#endif
-EXPORT_SYMBOL(ip_conntrack_protocol_register);
-EXPORT_SYMBOL(ip_conntrack_protocol_unregister);
-EXPORT_SYMBOL(ip_ct_get_tuple);
-EXPORT_SYMBOL(invert_tuplepr);
-EXPORT_SYMBOL(ip_conntrack_alter_reply);
-EXPORT_SYMBOL(ip_conntrack_destroyed);
-EXPORT_SYMBOL(need_conntrack);
-EXPORT_SYMBOL(ip_conntrack_helper_register);
-EXPORT_SYMBOL(ip_conntrack_helper_unregister);
-EXPORT_SYMBOL(ip_ct_iterate_cleanup);
-EXPORT_SYMBOL(__ip_ct_refresh_acct);
-
-EXPORT_SYMBOL(ip_conntrack_expect_alloc);
-EXPORT_SYMBOL(ip_conntrack_expect_put);
-EXPORT_SYMBOL_GPL(__ip_conntrack_expect_find);
-EXPORT_SYMBOL_GPL(ip_conntrack_expect_find_get);
-EXPORT_SYMBOL(ip_conntrack_expect_related);
-EXPORT_SYMBOL(ip_conntrack_unexpect_related);
-EXPORT_SYMBOL_GPL(ip_conntrack_expect_list);
-EXPORT_SYMBOL_GPL(ip_ct_unlink_expect);
-
-EXPORT_SYMBOL(ip_conntrack_tuple_taken);
-EXPORT_SYMBOL(ip_ct_gather_frags);
-EXPORT_SYMBOL(ip_conntrack_htable_size);
-EXPORT_SYMBOL(ip_conntrack_lock);
-EXPORT_SYMBOL(ip_conntrack_hash);
-EXPORT_SYMBOL(ip_conntrack_untracked);
-EXPORT_SYMBOL_GPL(ip_conntrack_find_get);
-#ifdef CONFIG_IP_NF_NAT_NEEDED
-EXPORT_SYMBOL(ip_conntrack_tcp_update);
-#endif
-
-EXPORT_SYMBOL_GPL(ip_conntrack_flush);
-EXPORT_SYMBOL_GPL(__ip_conntrack_find);
-
-EXPORT_SYMBOL_GPL(ip_conntrack_alloc);
-EXPORT_SYMBOL_GPL(ip_conntrack_free);
-EXPORT_SYMBOL_GPL(ip_conntrack_hash_insert);
-
-EXPORT_SYMBOL_GPL(ip_ct_remove_expectations);
-
-EXPORT_SYMBOL_GPL(ip_conntrack_helper_find_get);
-EXPORT_SYMBOL_GPL(ip_conntrack_helper_put);
-EXPORT_SYMBOL_GPL(__ip_conntrack_helper_find_byname);
-
-EXPORT_SYMBOL_GPL(ip_conntrack_proto_find_get);
-EXPORT_SYMBOL_GPL(ip_conntrack_proto_put);
-EXPORT_SYMBOL_GPL(__ip_conntrack_proto_find);
-EXPORT_SYMBOL_GPL(ip_conntrack_checksum);
-#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
- defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
-EXPORT_SYMBOL_GPL(ip_ct_port_tuple_to_nfattr);
-EXPORT_SYMBOL_GPL(ip_ct_port_nfattr_to_tuple);
-#endif
+++ /dev/null
-/* (C) 2001-2002 Magnus Boden <mb@ozaba.mine.nu>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Version: 0.0.7
- *
- * Thu 21 Mar 2002 Harald Welte <laforge@gnumonks.org>
- * - port to newnat API
- *
- */
-
-#include <linux/module.h>
-#include <linux/ip.h>
-#include <linux/udp.h>
-
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_tftp.h>
-#include <linux/moduleparam.h>
-
-MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");
-MODULE_DESCRIPTION("tftp connection tracking helper");
-MODULE_LICENSE("GPL");
-
-#define MAX_PORTS 8
-static unsigned short ports[MAX_PORTS];
-static int ports_c;
-module_param_array(ports, ushort, &ports_c, 0400);
-MODULE_PARM_DESC(ports, "port numbers of tftp servers");
-
-#if 0
-#define DEBUGP(format, args...) printk("%s:%s:" format, \
- __FILE__, __FUNCTION__ , ## args)
-#else
-#define DEBUGP(format, args...)
-#endif
-
-unsigned int (*ip_nat_tftp_hook)(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- struct ip_conntrack_expect *exp);
-EXPORT_SYMBOL_GPL(ip_nat_tftp_hook);
-
-static int tftp_help(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo)
-{
- struct tftphdr _tftph, *tfh;
- struct ip_conntrack_expect *exp;
- unsigned int ret = NF_ACCEPT;
- typeof(ip_nat_tftp_hook) ip_nat_tftp;
-
- tfh = skb_header_pointer(*pskb,
- ip_hdrlen(*pskb) + sizeof(struct udphdr),
- sizeof(_tftph), &_tftph);
- if (tfh == NULL)
- return NF_ACCEPT;
-
- switch (ntohs(tfh->opcode)) {
- /* RRQ and WRQ works the same way */
- case TFTP_OPCODE_READ:
- case TFTP_OPCODE_WRITE:
- DEBUGP("");
- DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
- DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
-
- exp = ip_conntrack_expect_alloc(ct);
- if (exp == NULL)
- return NF_DROP;
-
- exp->tuple = ct->tuplehash[IP_CT_DIR_REPLY].tuple;
- exp->mask.src.ip = htonl(0xffffffff);
- exp->mask.src.u.udp.port = 0;
- exp->mask.dst.ip = htonl(0xffffffff);
- exp->mask.dst.u.udp.port = htons(0xffff);
- exp->mask.dst.protonum = 0xff;
- exp->expectfn = NULL;
- exp->flags = 0;
-
- DEBUGP("expect: ");
- DUMP_TUPLE(&exp->tuple);
- DUMP_TUPLE(&exp->mask);
- ip_nat_tftp = rcu_dereference(ip_nat_tftp_hook);
- if (ip_nat_tftp)
- ret = ip_nat_tftp(pskb, ctinfo, exp);
- else if (ip_conntrack_expect_related(exp) != 0)
- ret = NF_DROP;
- ip_conntrack_expect_put(exp);
- break;
- case TFTP_OPCODE_DATA:
- case TFTP_OPCODE_ACK:
- DEBUGP("Data/ACK opcode\n");
- break;
- case TFTP_OPCODE_ERROR:
- DEBUGP("Error opcode\n");
- break;
- default:
- DEBUGP("Unknown opcode\n");
- }
- return NF_ACCEPT;
-}
-
-static struct ip_conntrack_helper tftp[MAX_PORTS];
-static char tftp_names[MAX_PORTS][sizeof("tftp-65535")];
-
-static void ip_conntrack_tftp_fini(void)
-{
- int i;
-
- for (i = 0 ; i < ports_c; i++) {
- DEBUGP("unregistering helper for port %d\n",
- ports[i]);
- ip_conntrack_helper_unregister(&tftp[i]);
- }
-}
-
-static int __init ip_conntrack_tftp_init(void)
-{
- int i, ret;
- char *tmpname;
-
- if (ports_c == 0)
- ports[ports_c++] = TFTP_PORT;
-
- for (i = 0; i < ports_c; i++) {
- /* Create helper structure */
- memset(&tftp[i], 0, sizeof(struct ip_conntrack_helper));
-
- tftp[i].tuple.dst.protonum = IPPROTO_UDP;
- tftp[i].tuple.src.u.udp.port = htons(ports[i]);
- tftp[i].mask.dst.protonum = 0xFF;
- tftp[i].mask.src.u.udp.port = htons(0xFFFF);
- tftp[i].max_expected = 1;
- tftp[i].timeout = 5 * 60; /* 5 minutes */
- tftp[i].me = THIS_MODULE;
- tftp[i].help = tftp_help;
-
- tmpname = &tftp_names[i][0];
- if (ports[i] == TFTP_PORT)
- sprintf(tmpname, "tftp");
- else
- sprintf(tmpname, "tftp-%d", i);
- tftp[i].name = tmpname;
-
- DEBUGP("port #%d: %d\n", i, ports[i]);
-
- ret=ip_conntrack_helper_register(&tftp[i]);
- if (ret) {
- printk("ERROR registering helper for port %d\n",
- ports[i]);
- ip_conntrack_tftp_fini();
- return(ret);
- }
- }
- return(0);
-}
-
-module_init(ip_conntrack_tftp_init);
-module_exit(ip_conntrack_tftp_fini);
+++ /dev/null
-/* Amanda extension for TCP NAT alteration.
- * (C) 2002 by Brian J. Murrell <netfilter@interlinx.bc.ca>
- * based on a copy of HW's ip_nat_irc.c as well as other modules
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * Module load syntax:
- * insmod ip_nat_amanda.o
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/netfilter.h>
-#include <linux/skbuff.h>
-#include <linux/ip.h>
-#include <linux/udp.h>
-#include <net/tcp.h>
-#include <net/udp.h>
-
-#include <linux/netfilter_ipv4.h>
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_amanda.h>
-
-
-MODULE_AUTHOR("Brian J. Murrell <netfilter@interlinx.bc.ca>");
-MODULE_DESCRIPTION("Amanda NAT helper");
-MODULE_LICENSE("GPL");
-
-static unsigned int help(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- unsigned int matchoff,
- unsigned int matchlen,
- struct ip_conntrack_expect *exp)
-{
- char buffer[sizeof("65535")];
- u_int16_t port;
- unsigned int ret;
-
- /* Connection comes from client. */
- exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
- exp->dir = IP_CT_DIR_ORIGINAL;
-
- /* When you see the packet, we need to NAT it the same as the
- * this one (ie. same IP: it will be TCP and master is UDP). */
- exp->expectfn = ip_nat_follow_master;
-
- /* Try to get same port: if not, try to change it. */
- for (port = ntohs(exp->saved_proto.tcp.port); port != 0; port++) {
- exp->tuple.dst.u.tcp.port = htons(port);
- if (ip_conntrack_expect_related(exp) == 0)
- break;
- }
-
- if (port == 0)
- return NF_DROP;
-
- sprintf(buffer, "%u", port);
- ret = ip_nat_mangle_udp_packet(pskb, exp->master, ctinfo,
- matchoff, matchlen,
- buffer, strlen(buffer));
- if (ret != NF_ACCEPT)
- ip_conntrack_unexpect_related(exp);
- return ret;
-}
-
-static void __exit ip_nat_amanda_fini(void)
-{
- rcu_assign_pointer(ip_nat_amanda_hook, NULL);
- synchronize_rcu();
-}
-
-static int __init ip_nat_amanda_init(void)
-{
- BUG_ON(rcu_dereference(ip_nat_amanda_hook));
- rcu_assign_pointer(ip_nat_amanda_hook, help);
- return 0;
-}
-
-module_init(ip_nat_amanda_init);
-module_exit(ip_nat_amanda_fini);
+++ /dev/null
-/* NAT for netfilter; shared with compatibility layer. */
-
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/timer.h>
-#include <linux/skbuff.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/vmalloc.h>
-#include <net/checksum.h>
-#include <net/icmp.h>
-#include <net/ip.h>
-#include <net/tcp.h> /* For tcp_prot in getorigdst */
-#include <linux/icmp.h>
-#include <linux/udp.h>
-#include <linux/jhash.h>
-
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_conntrack_core.h>
-#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_protocol.h>
-#include <linux/netfilter_ipv4/ip_nat_core.h>
-#include <linux/netfilter_ipv4/ip_nat_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-DEFINE_RWLOCK(ip_nat_lock);
-
-/* Calculated at init based on memory size */
-static unsigned int ip_nat_htable_size;
-
-static struct list_head *bysource;
-
-#define MAX_IP_NAT_PROTO 256
-static struct ip_nat_protocol *ip_nat_protos[MAX_IP_NAT_PROTO];
-
-static inline struct ip_nat_protocol *
-__ip_nat_proto_find(u_int8_t protonum)
-{
- return rcu_dereference(ip_nat_protos[protonum]);
-}
-
-struct ip_nat_protocol *
-ip_nat_proto_find_get(u_int8_t protonum)
-{
- struct ip_nat_protocol *p;
-
- rcu_read_lock();
- p = __ip_nat_proto_find(protonum);
- if (!try_module_get(p->me))
- p = &ip_nat_unknown_protocol;
- rcu_read_unlock();
-
- return p;
-}
-EXPORT_SYMBOL_GPL(ip_nat_proto_find_get);
-
-void
-ip_nat_proto_put(struct ip_nat_protocol *p)
-{
- module_put(p->me);
-}
-EXPORT_SYMBOL_GPL(ip_nat_proto_put);
-
-/* We keep an extra hash for each conntrack, for fast searching. */
-static inline unsigned int
-hash_by_src(const struct ip_conntrack_tuple *tuple)
-{
- /* Original src, to ensure we map it consistently if poss. */
- return jhash_3words((__force u32)tuple->src.ip, tuple->src.u.all,
- tuple->dst.protonum, 0) % ip_nat_htable_size;
-}
-
-/* Noone using conntrack by the time this called. */
-static void ip_nat_cleanup_conntrack(struct ip_conntrack *conn)
-{
- if (!(conn->status & IPS_NAT_DONE_MASK))
- return;
-
- write_lock_bh(&ip_nat_lock);
- list_del(&conn->nat.info.bysource);
- write_unlock_bh(&ip_nat_lock);
-}
-
-/* Is this tuple already taken? (not by us) */
-int
-ip_nat_used_tuple(const struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack *ignored_conntrack)
-{
- /* Conntrack tracking doesn't keep track of outgoing tuples; only
- incoming ones. NAT means they don't have a fixed mapping,
- so we invert the tuple and look for the incoming reply.
-
- We could keep a separate hash if this proves too slow. */
- struct ip_conntrack_tuple reply;
-
- invert_tuplepr(&reply, tuple);
- return ip_conntrack_tuple_taken(&reply, ignored_conntrack);
-}
-EXPORT_SYMBOL(ip_nat_used_tuple);
-
-/* If we source map this tuple so reply looks like reply_tuple, will
- * that meet the constraints of range. */
-static int
-in_range(const struct ip_conntrack_tuple *tuple,
- const struct ip_nat_range *range)
-{
- struct ip_nat_protocol *proto;
- int ret = 0;
-
- /* If we are supposed to map IPs, then we must be in the
- range specified, otherwise let this drag us onto a new src IP. */
- if (range->flags & IP_NAT_RANGE_MAP_IPS) {
- if (ntohl(tuple->src.ip) < ntohl(range->min_ip)
- || ntohl(tuple->src.ip) > ntohl(range->max_ip))
- return 0;
- }
-
- rcu_read_lock();
- proto = __ip_nat_proto_find(tuple->dst.protonum);
- if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)
- || proto->in_range(tuple, IP_NAT_MANIP_SRC,
- &range->min, &range->max))
- ret = 1;
- rcu_read_unlock();
-
- return ret;
-}
-
-static inline int
-same_src(const struct ip_conntrack *ct,
- const struct ip_conntrack_tuple *tuple)
-{
- return (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum
- == tuple->dst.protonum
- && ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip
- == tuple->src.ip
- && ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.all
- == tuple->src.u.all);
-}
-
-/* Only called for SRC manip */
-static int
-find_appropriate_src(const struct ip_conntrack_tuple *tuple,
- struct ip_conntrack_tuple *result,
- const struct ip_nat_range *range)
-{
- unsigned int h = hash_by_src(tuple);
- struct ip_conntrack *ct;
-
- read_lock_bh(&ip_nat_lock);
- list_for_each_entry(ct, &bysource[h], nat.info.bysource) {
- if (same_src(ct, tuple)) {
- /* Copy source part from reply tuple. */
- invert_tuplepr(result,
- &ct->tuplehash[IP_CT_DIR_REPLY].tuple);
- result->dst = tuple->dst;
-
- if (in_range(result, range)) {
- read_unlock_bh(&ip_nat_lock);
- return 1;
- }
- }
- }
- read_unlock_bh(&ip_nat_lock);
- return 0;
-}
-
-/* For [FUTURE] fragmentation handling, we want the least-used
- src-ip/dst-ip/proto triple. Fairness doesn't come into it. Thus
- if the range specifies 1.2.3.4 ports 10000-10005 and 1.2.3.5 ports
- 1-65535, we don't do pro-rata allocation based on ports; we choose
- the ip with the lowest src-ip/dst-ip/proto usage.
-*/
-static void
-find_best_ips_proto(struct ip_conntrack_tuple *tuple,
- const struct ip_nat_range *range,
- const struct ip_conntrack *conntrack,
- enum ip_nat_manip_type maniptype)
-{
- __be32 *var_ipp;
- /* Host order */
- u_int32_t minip, maxip, j;
-
- /* No IP mapping? Do nothing. */
- if (!(range->flags & IP_NAT_RANGE_MAP_IPS))
- return;
-
- if (maniptype == IP_NAT_MANIP_SRC)
- var_ipp = &tuple->src.ip;
- else
- var_ipp = &tuple->dst.ip;
-
- /* Fast path: only one choice. */
- if (range->min_ip == range->max_ip) {
- *var_ipp = range->min_ip;
- return;
- }
-
- /* Hashing source and destination IPs gives a fairly even
- * spread in practice (if there are a small number of IPs
- * involved, there usually aren't that many connections
- * anyway). The consistency means that servers see the same
- * client coming from the same IP (some Internet Banking sites
- * like this), even across reboots. */
- minip = ntohl(range->min_ip);
- maxip = ntohl(range->max_ip);
- j = jhash_2words((__force u32)tuple->src.ip, (__force u32)tuple->dst.ip, 0);
- *var_ipp = htonl(minip + j % (maxip - minip + 1));
-}
-
-/* Manipulate the tuple into the range given. For NF_IP_POST_ROUTING,
- * we change the source to map into the range. For NF_IP_PRE_ROUTING
- * and NF_IP_LOCAL_OUT, we change the destination to map into the
- * range. It might not be possible to get a unique tuple, but we try.
- * At worst (or if we race), we will end up with a final duplicate in
- * __ip_conntrack_confirm and drop the packet. */
-static void
-get_unique_tuple(struct ip_conntrack_tuple *tuple,
- const struct ip_conntrack_tuple *orig_tuple,
- const struct ip_nat_range *range,
- struct ip_conntrack *conntrack,
- enum ip_nat_manip_type maniptype)
-{
- struct ip_nat_protocol *proto;
-
- /* 1) If this srcip/proto/src-proto-part is currently mapped,
- and that same mapping gives a unique tuple within the given
- range, use that.
-
- This is only required for source (ie. NAT/masq) mappings.
- So far, we don't do local source mappings, so multiple
- manips not an issue. */
- if (maniptype == IP_NAT_MANIP_SRC) {
- if (find_appropriate_src(orig_tuple, tuple, range)) {
- DEBUGP("get_unique_tuple: Found current src map\n");
- if (!(range->flags & IP_NAT_RANGE_PROTO_RANDOM))
- if (!ip_nat_used_tuple(tuple, conntrack))
- return;
- }
- }
-
- /* 2) Select the least-used IP/proto combination in the given
- range. */
- *tuple = *orig_tuple;
- find_best_ips_proto(tuple, range, conntrack, maniptype);
-
- /* 3) The per-protocol part of the manip is made to map into
- the range to make a unique tuple. */
-
- rcu_read_lock();
- proto = __ip_nat_proto_find(orig_tuple->dst.protonum);
-
- /* Change protocol info to have some randomization */
- if (range->flags & IP_NAT_RANGE_PROTO_RANDOM) {
- proto->unique_tuple(tuple, range, maniptype, conntrack);
- goto out;
- }
-
- /* Only bother mapping if it's not already in range and unique */
- if ((!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)
- || proto->in_range(tuple, maniptype, &range->min, &range->max))
- && !ip_nat_used_tuple(tuple, conntrack))
- goto out;
-
- /* Last change: get protocol to try to obtain unique tuple. */
- proto->unique_tuple(tuple, range, maniptype, conntrack);
-out:
- rcu_read_unlock();
-}
-
-unsigned int
-ip_nat_setup_info(struct ip_conntrack *conntrack,
- const struct ip_nat_range *range,
- unsigned int hooknum)
-{
- struct ip_conntrack_tuple curr_tuple, new_tuple;
- struct ip_nat_info *info = &conntrack->nat.info;
- int have_to_hash = !(conntrack->status & IPS_NAT_DONE_MASK);
- enum ip_nat_manip_type maniptype = HOOK2MANIP(hooknum);
-
- IP_NF_ASSERT(hooknum == NF_IP_PRE_ROUTING
- || hooknum == NF_IP_POST_ROUTING
- || hooknum == NF_IP_LOCAL_IN
- || hooknum == NF_IP_LOCAL_OUT);
- BUG_ON(ip_nat_initialized(conntrack, maniptype));
-
- /* What we've got will look like inverse of reply. Normally
- this is what is in the conntrack, except for prior
- manipulations (future optimization: if num_manips == 0,
- orig_tp =
- conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple) */
- invert_tuplepr(&curr_tuple,
- &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple);
-
- get_unique_tuple(&new_tuple, &curr_tuple, range, conntrack, maniptype);
-
- if (!ip_ct_tuple_equal(&new_tuple, &curr_tuple)) {
- struct ip_conntrack_tuple reply;
-
- /* Alter conntrack table so will recognize replies. */
- invert_tuplepr(&reply, &new_tuple);
- ip_conntrack_alter_reply(conntrack, &reply);
-
- /* Non-atomic: we own this at the moment. */
- if (maniptype == IP_NAT_MANIP_SRC)
- conntrack->status |= IPS_SRC_NAT;
- else
- conntrack->status |= IPS_DST_NAT;
- }
-
- /* Place in source hash if this is the first time. */
- if (have_to_hash) {
- unsigned int srchash
- = hash_by_src(&conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
- .tuple);
- write_lock_bh(&ip_nat_lock);
- list_add(&info->bysource, &bysource[srchash]);
- write_unlock_bh(&ip_nat_lock);
- }
-
- /* It's done. */
- if (maniptype == IP_NAT_MANIP_DST)
- set_bit(IPS_DST_NAT_DONE_BIT, &conntrack->status);
- else
- set_bit(IPS_SRC_NAT_DONE_BIT, &conntrack->status);
-
- return NF_ACCEPT;
-}
-EXPORT_SYMBOL(ip_nat_setup_info);
-
-/* Returns true if succeeded. */
-static int
-manip_pkt(u_int16_t proto,
- struct sk_buff **pskb,
- unsigned int iphdroff,
- const struct ip_conntrack_tuple *target,
- enum ip_nat_manip_type maniptype)
-{
- struct iphdr *iph;
- struct ip_nat_protocol *p;
-
- if (!skb_make_writable(pskb, iphdroff + sizeof(*iph)))
- return 0;
-
- iph = (void *)(*pskb)->data + iphdroff;
-
- /* Manipulate protcol part. */
-
- /* rcu_read_lock()ed by nf_hook_slow */
- p = __ip_nat_proto_find(proto);
- if (!p->manip_pkt(pskb, iphdroff, target, maniptype))
- return 0;
-
- iph = (void *)(*pskb)->data + iphdroff;
-
- if (maniptype == IP_NAT_MANIP_SRC) {
- nf_csum_replace4(&iph->check, iph->saddr, target->src.ip);
- iph->saddr = target->src.ip;
- } else {
- nf_csum_replace4(&iph->check, iph->daddr, target->dst.ip);
- iph->daddr = target->dst.ip;
- }
- return 1;
-}
-
-/* Do packet manipulations according to ip_nat_setup_info. */
-unsigned int ip_nat_packet(struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned int hooknum,
- struct sk_buff **pskb)
-{
- enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
- unsigned long statusbit;
- enum ip_nat_manip_type mtype = HOOK2MANIP(hooknum);
-
- if (mtype == IP_NAT_MANIP_SRC)
- statusbit = IPS_SRC_NAT;
- else
- statusbit = IPS_DST_NAT;
-
- /* Invert if this is reply dir. */
- if (dir == IP_CT_DIR_REPLY)
- statusbit ^= IPS_NAT_MASK;
-
- /* Non-atomic: these bits don't change. */
- if (ct->status & statusbit) {
- struct ip_conntrack_tuple target;
-
- /* We are aiming to look like inverse of other direction. */
- invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
-
- if (!manip_pkt(target.dst.protonum, pskb, 0, &target, mtype))
- return NF_DROP;
- }
- return NF_ACCEPT;
-}
-EXPORT_SYMBOL_GPL(ip_nat_packet);
-
-/* Dir is direction ICMP is coming from (opposite to packet it contains) */
-int ip_nat_icmp_reply_translation(struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned int hooknum,
- struct sk_buff **pskb)
-{
- struct {
- struct icmphdr icmp;
- struct iphdr ip;
- } *inside;
- struct ip_conntrack_protocol *proto;
- struct ip_conntrack_tuple inner, target;
- int hdrlen = ip_hdrlen(*pskb);
- enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
- unsigned long statusbit;
- enum ip_nat_manip_type manip = HOOK2MANIP(hooknum);
-
- if (!skb_make_writable(pskb, hdrlen + sizeof(*inside)))
- return 0;
-
- inside = (void *)(*pskb)->data + ip_hdrlen(*pskb);
-
- /* We're actually going to mangle it beyond trivial checksum
- adjustment, so make sure the current checksum is correct. */
- if (nf_ip_checksum(*pskb, hooknum, hdrlen, 0))
- return 0;
-
- /* Must be RELATED */
- IP_NF_ASSERT((*pskb)->nfctinfo == IP_CT_RELATED ||
- (*pskb)->nfctinfo == IP_CT_RELATED+IP_CT_IS_REPLY);
-
- /* Redirects on non-null nats must be dropped, else they'll
- start talking to each other without our translation, and be
- confused... --RR */
- if (inside->icmp.type == ICMP_REDIRECT) {
- /* If NAT isn't finished, assume it and drop. */
- if ((ct->status & IPS_NAT_DONE_MASK) != IPS_NAT_DONE_MASK)
- return 0;
-
- if (ct->status & IPS_NAT_MASK)
- return 0;
- }
-
- DEBUGP("icmp_reply_translation: translating error %p manp %u dir %s\n",
- *pskb, manip, dir == IP_CT_DIR_ORIGINAL ? "ORIG" : "REPLY");
-
- /* rcu_read_lock()ed by nf_hook_slow */
- proto = __ip_conntrack_proto_find(inside->ip.protocol);
- if (!ip_ct_get_tuple(&inside->ip, *pskb, ip_hdrlen(*pskb) +
- sizeof(struct icmphdr) + inside->ip.ihl*4,
- &inner, proto))
- return 0;
-
- /* Change inner back to look like incoming packet. We do the
- opposite manip on this hook to normal, because it might not
- pass all hooks (locally-generated ICMP). Consider incoming
- packet: PREROUTING (DST manip), routing produces ICMP, goes
- through POSTROUTING (which must correct the DST manip). */
- if (!manip_pkt(inside->ip.protocol, pskb,
- ip_hdrlen(*pskb) + sizeof(inside->icmp),
- &ct->tuplehash[!dir].tuple,
- !manip))
- return 0;
-
- if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
- /* Reloading "inside" here since manip_pkt inner. */
- inside = (void *)(*pskb)->data + ip_hdrlen(*pskb);
- inside->icmp.checksum = 0;
- inside->icmp.checksum = csum_fold(skb_checksum(*pskb, hdrlen,
- (*pskb)->len - hdrlen,
- 0));
- }
-
- /* Change outer to look the reply to an incoming packet
- * (proto 0 means don't invert per-proto part). */
- if (manip == IP_NAT_MANIP_SRC)
- statusbit = IPS_SRC_NAT;
- else
- statusbit = IPS_DST_NAT;
-
- /* Invert if this is reply dir. */
- if (dir == IP_CT_DIR_REPLY)
- statusbit ^= IPS_NAT_MASK;
-
- if (ct->status & statusbit) {
- invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
- if (!manip_pkt(0, pskb, 0, &target, manip))
- return 0;
- }
-
- return 1;
-}
-EXPORT_SYMBOL_GPL(ip_nat_icmp_reply_translation);
-
-/* Protocol registration. */
-int ip_nat_protocol_register(struct ip_nat_protocol *proto)
-{
- int ret = 0;
-
- write_lock_bh(&ip_nat_lock);
- if (ip_nat_protos[proto->protonum] != &ip_nat_unknown_protocol) {
- ret = -EBUSY;
- goto out;
- }
- rcu_assign_pointer(ip_nat_protos[proto->protonum], proto);
- out:
- write_unlock_bh(&ip_nat_lock);
- return ret;
-}
-EXPORT_SYMBOL(ip_nat_protocol_register);
-
-/* Noone stores the protocol anywhere; simply delete it. */
-void ip_nat_protocol_unregister(struct ip_nat_protocol *proto)
-{
- write_lock_bh(&ip_nat_lock);
- rcu_assign_pointer(ip_nat_protos[proto->protonum],
- &ip_nat_unknown_protocol);
- write_unlock_bh(&ip_nat_lock);
- synchronize_rcu();
-}
-EXPORT_SYMBOL(ip_nat_protocol_unregister);
-
-#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
- defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
-int
-ip_nat_port_range_to_nfattr(struct sk_buff *skb,
- const struct ip_nat_range *range)
-{
- NFA_PUT(skb, CTA_PROTONAT_PORT_MIN, sizeof(__be16),
- &range->min.tcp.port);
- NFA_PUT(skb, CTA_PROTONAT_PORT_MAX, sizeof(__be16),
- &range->max.tcp.port);
-
- return 0;
-
-nfattr_failure:
- return -1;
-}
-
-int
-ip_nat_port_nfattr_to_range(struct nfattr *tb[], struct ip_nat_range *range)
-{
- int ret = 0;
-
- /* we have to return whether we actually parsed something or not */
-
- if (tb[CTA_PROTONAT_PORT_MIN-1]) {
- ret = 1;
- range->min.tcp.port =
- *(__be16 *)NFA_DATA(tb[CTA_PROTONAT_PORT_MIN-1]);
- }
-
- if (!tb[CTA_PROTONAT_PORT_MAX-1]) {
- if (ret)
- range->max.tcp.port = range->min.tcp.port;
- } else {
- ret = 1;
- range->max.tcp.port =
- *(__be16 *)NFA_DATA(tb[CTA_PROTONAT_PORT_MAX-1]);
- }
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(ip_nat_port_nfattr_to_range);
-EXPORT_SYMBOL_GPL(ip_nat_port_range_to_nfattr);
-#endif
-
-static int __init ip_nat_init(void)
-{
- size_t i;
-
- /* Leave them the same for the moment. */
- ip_nat_htable_size = ip_conntrack_htable_size;
-
- /* One vmalloc for both hash tables */
- bysource = vmalloc(sizeof(struct list_head) * ip_nat_htable_size);
- if (!bysource)
- return -ENOMEM;
-
- /* Sew in builtin protocols. */
- write_lock_bh(&ip_nat_lock);
- for (i = 0; i < MAX_IP_NAT_PROTO; i++)
- rcu_assign_pointer(ip_nat_protos[i], &ip_nat_unknown_protocol);
- rcu_assign_pointer(ip_nat_protos[IPPROTO_TCP], &ip_nat_protocol_tcp);
- rcu_assign_pointer(ip_nat_protos[IPPROTO_UDP], &ip_nat_protocol_udp);
- rcu_assign_pointer(ip_nat_protos[IPPROTO_ICMP], &ip_nat_protocol_icmp);
- write_unlock_bh(&ip_nat_lock);
-
- for (i = 0; i < ip_nat_htable_size; i++) {
- INIT_LIST_HEAD(&bysource[i]);
- }
-
- /* FIXME: Man, this is a hack. <SIGH> */
- IP_NF_ASSERT(rcu_dereference(ip_conntrack_destroyed) == NULL);
- rcu_assign_pointer(ip_conntrack_destroyed, ip_nat_cleanup_conntrack);
-
- /* Initialize fake conntrack so that NAT will skip it */
- ip_conntrack_untracked.status |= IPS_NAT_DONE_MASK;
- return 0;
-}
-
-/* Clear NAT section of all conntracks, in case we're loaded again. */
-static int clean_nat(struct ip_conntrack *i, void *data)
-{
- memset(&i->nat, 0, sizeof(i->nat));
- i->status &= ~(IPS_NAT_MASK | IPS_NAT_DONE_MASK | IPS_SEQ_ADJUST);
- return 0;
-}
-
-static void __exit ip_nat_cleanup(void)
-{
- ip_ct_iterate_cleanup(&clean_nat, NULL);
- rcu_assign_pointer(ip_conntrack_destroyed, NULL);
- synchronize_rcu();
- vfree(bysource);
-}
-
-MODULE_LICENSE("GPL");
-
-module_init(ip_nat_init);
-module_exit(ip_nat_cleanup);
+++ /dev/null
-/* FTP extension for TCP NAT alteration. */
-
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/module.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/ip.h>
-#include <linux/tcp.h>
-#include <linux/moduleparam.h>
-#include <net/tcp.h>
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_helper.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#include <linux/netfilter_ipv4/ip_conntrack_ftp.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");
-MODULE_DESCRIPTION("ftp NAT helper");
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-/* FIXME: Time out? --RR */
-
-static int
-mangle_rfc959_packet(struct sk_buff **pskb,
- __be32 newip,
- u_int16_t port,
- unsigned int matchoff,
- unsigned int matchlen,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- u32 *seq)
-{
- char buffer[sizeof("nnn,nnn,nnn,nnn,nnn,nnn")];
-
- sprintf(buffer, "%u,%u,%u,%u,%u,%u",
- NIPQUAD(newip), port>>8, port&0xFF);
-
- DEBUGP("calling ip_nat_mangle_tcp_packet\n");
-
- *seq += strlen(buffer) - matchlen;
- return ip_nat_mangle_tcp_packet(pskb, ct, ctinfo, matchoff,
- matchlen, buffer, strlen(buffer));
-}
-
-/* |1|132.235.1.2|6275| */
-static int
-mangle_eprt_packet(struct sk_buff **pskb,
- __be32 newip,
- u_int16_t port,
- unsigned int matchoff,
- unsigned int matchlen,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- u32 *seq)
-{
- char buffer[sizeof("|1|255.255.255.255|65535|")];
-
- sprintf(buffer, "|1|%u.%u.%u.%u|%u|", NIPQUAD(newip), port);
-
- DEBUGP("calling ip_nat_mangle_tcp_packet\n");
-
- *seq += strlen(buffer) - matchlen;
- return ip_nat_mangle_tcp_packet(pskb, ct, ctinfo, matchoff,
- matchlen, buffer, strlen(buffer));
-}
-
-/* |1|132.235.1.2|6275| */
-static int
-mangle_epsv_packet(struct sk_buff **pskb,
- __be32 newip,
- u_int16_t port,
- unsigned int matchoff,
- unsigned int matchlen,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- u32 *seq)
-{
- char buffer[sizeof("|||65535|")];
-
- sprintf(buffer, "|||%u|", port);
-
- DEBUGP("calling ip_nat_mangle_tcp_packet\n");
-
- *seq += strlen(buffer) - matchlen;
- return ip_nat_mangle_tcp_packet(pskb, ct, ctinfo, matchoff,
- matchlen, buffer, strlen(buffer));
-}
-
-static int (*mangle[])(struct sk_buff **, __be32, u_int16_t,
- unsigned int,
- unsigned int,
- struct ip_conntrack *,
- enum ip_conntrack_info,
- u32 *seq)
-= { [IP_CT_FTP_PORT] = mangle_rfc959_packet,
- [IP_CT_FTP_PASV] = mangle_rfc959_packet,
- [IP_CT_FTP_EPRT] = mangle_eprt_packet,
- [IP_CT_FTP_EPSV] = mangle_epsv_packet
-};
-
-/* So, this packet has hit the connection tracking matching code.
- Mangle it, and change the expectation to match the new version. */
-static unsigned int ip_nat_ftp(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- enum ip_ct_ftp_type type,
- unsigned int matchoff,
- unsigned int matchlen,
- struct ip_conntrack_expect *exp,
- u32 *seq)
-{
- __be32 newip;
- u_int16_t port;
- int dir = CTINFO2DIR(ctinfo);
- struct ip_conntrack *ct = exp->master;
-
- DEBUGP("FTP_NAT: type %i, off %u len %u\n", type, matchoff, matchlen);
-
- /* Connection will come from wherever this packet goes, hence !dir */
- newip = ct->tuplehash[!dir].tuple.dst.ip;
- exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
- exp->dir = !dir;
-
- /* When you see the packet, we need to NAT it the same as the
- * this one. */
- exp->expectfn = ip_nat_follow_master;
-
- /* Try to get same port: if not, try to change it. */
- for (port = ntohs(exp->saved_proto.tcp.port); port != 0; port++) {
- exp->tuple.dst.u.tcp.port = htons(port);
- if (ip_conntrack_expect_related(exp) == 0)
- break;
- }
-
- if (port == 0)
- return NF_DROP;
-
- if (!mangle[type](pskb, newip, port, matchoff, matchlen, ct, ctinfo,
- seq)) {
- ip_conntrack_unexpect_related(exp);
- return NF_DROP;
- }
- return NF_ACCEPT;
-}
-
-static void __exit ip_nat_ftp_fini(void)
-{
- rcu_assign_pointer(ip_nat_ftp_hook, NULL);
- synchronize_rcu();
-}
-
-static int __init ip_nat_ftp_init(void)
-{
- BUG_ON(rcu_dereference(ip_nat_ftp_hook));
- rcu_assign_pointer(ip_nat_ftp_hook, ip_nat_ftp);
- return 0;
-}
-
-/* Prior to 2.6.11, we had a ports param. No longer, but don't break users. */
-static int warn_set(const char *val, struct kernel_param *kp)
-{
- printk(KERN_INFO KBUILD_MODNAME
- ": kernel >= 2.6.10 only uses 'ports' for conntrack modules\n");
- return 0;
-}
-module_param_call(ports, warn_set, NULL, NULL, 0);
-
-module_init(ip_nat_ftp_init);
-module_exit(ip_nat_ftp_fini);
+++ /dev/null
-/* ip_nat_helper.c - generic support functions for NAT helpers
- *
- * (C) 2000-2002 Harald Welte <laforge@netfilter.org>
- * (C) 2003-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * 14 Jan 2002 Harald Welte <laforge@gnumonks.org>:
- * - add support for SACK adjustment
- * 14 Mar 2002 Harald Welte <laforge@gnumonks.org>:
- * - merge SACK support into newnat API
- * 16 Aug 2002 Brian J. Murrell <netfilter@interlinx.bc.ca>:
- * - make ip_nat_resize_packet more generic (TCP and UDP)
- * - add ip_nat_mangle_udp_packet
- */
-#include <linux/module.h>
-#include <linux/kmod.h>
-#include <linux/types.h>
-#include <linux/timer.h>
-#include <linux/skbuff.h>
-#include <linux/netfilter_ipv4.h>
-#include <net/checksum.h>
-#include <net/icmp.h>
-#include <net/ip.h>
-#include <net/tcp.h>
-#include <net/udp.h>
-
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_protocol.h>
-#include <linux/netfilter_ipv4/ip_nat_core.h>
-#include <linux/netfilter_ipv4/ip_nat_helper.h>
-
-#if 0
-#define DEBUGP printk
-#define DUMP_OFFSET(x) printk("offset_before=%d, offset_after=%d, correction_pos=%u\n", x->offset_before, x->offset_after, x->correction_pos);
-#else
-#define DEBUGP(format, args...)
-#define DUMP_OFFSET(x)
-#endif
-
-static DEFINE_SPINLOCK(ip_nat_seqofs_lock);
-
-/* Setup TCP sequence correction given this change at this sequence */
-static inline void
-adjust_tcp_sequence(u32 seq,
- int sizediff,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo)
-{
- int dir;
- struct ip_nat_seq *this_way, *other_way;
-
- DEBUGP("ip_nat_resize_packet: old_size = %u, new_size = %u\n",
- (*skb)->len, new_size);
-
- dir = CTINFO2DIR(ctinfo);
-
- this_way = &ct->nat.info.seq[dir];
- other_way = &ct->nat.info.seq[!dir];
-
- DEBUGP("ip_nat_resize_packet: Seq_offset before: ");
- DUMP_OFFSET(this_way);
-
- spin_lock_bh(&ip_nat_seqofs_lock);
-
- /* SYN adjust. If it's uninitialized, or this is after last
- * correction, record it: we don't handle more than one
- * adjustment in the window, but do deal with common case of a
- * retransmit */
- if (this_way->offset_before == this_way->offset_after
- || before(this_way->correction_pos, seq)) {
- this_way->correction_pos = seq;
- this_way->offset_before = this_way->offset_after;
- this_way->offset_after += sizediff;
- }
- spin_unlock_bh(&ip_nat_seqofs_lock);
-
- DEBUGP("ip_nat_resize_packet: Seq_offset after: ");
- DUMP_OFFSET(this_way);
-}
-
-/* Frobs data inside this packet, which is linear. */
-static void mangle_contents(struct sk_buff *skb,
- unsigned int dataoff,
- unsigned int match_offset,
- unsigned int match_len,
- const char *rep_buffer,
- unsigned int rep_len)
-{
- unsigned char *data;
-
- BUG_ON(skb_is_nonlinear(skb));
- data = skb_network_header(skb) + dataoff;
-
- /* move post-replacement */
- memmove(data + match_offset + rep_len,
- data + match_offset + match_len,
- skb->tail - (data + match_offset + match_len));
-
- /* insert data from buffer */
- memcpy(data + match_offset, rep_buffer, rep_len);
-
- /* update skb info */
- if (rep_len > match_len) {
- DEBUGP("ip_nat_mangle_packet: Extending packet by "
- "%u from %u bytes\n", rep_len - match_len,
- skb->len);
- skb_put(skb, rep_len - match_len);
- } else {
- DEBUGP("ip_nat_mangle_packet: Shrinking packet from "
- "%u from %u bytes\n", match_len - rep_len,
- skb->len);
- __skb_trim(skb, skb->len + rep_len - match_len);
- }
-
- /* fix IP hdr checksum information */
- ip_hdr(skb)->tot_len = htons(skb->len);
- ip_send_check(ip_hdr(skb));
-}
-
-/* Unusual, but possible case. */
-static int enlarge_skb(struct sk_buff **pskb, unsigned int extra)
-{
- struct sk_buff *nskb;
-
- if ((*pskb)->len + extra > 65535)
- return 0;
-
- nskb = skb_copy_expand(*pskb, skb_headroom(*pskb), extra, GFP_ATOMIC);
- if (!nskb)
- return 0;
-
- /* Transfer socket to new skb. */
- if ((*pskb)->sk)
- skb_set_owner_w(nskb, (*pskb)->sk);
- kfree_skb(*pskb);
- *pskb = nskb;
- return 1;
-}
-
-/* Generic function for mangling variable-length address changes inside
- * NATed TCP connections (like the PORT XXX,XXX,XXX,XXX,XXX,XXX
- * command in FTP).
- *
- * Takes care about all the nasty sequence number changes, checksumming,
- * skb enlargement, ...
- *
- * */
-int
-ip_nat_mangle_tcp_packet(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned int match_offset,
- unsigned int match_len,
- const char *rep_buffer,
- unsigned int rep_len)
-{
- struct iphdr *iph;
- struct tcphdr *tcph;
- int oldlen, datalen;
-
- if (!skb_make_writable(pskb, (*pskb)->len))
- return 0;
-
- if (rep_len > match_len
- && rep_len - match_len > skb_tailroom(*pskb)
- && !enlarge_skb(pskb, rep_len - match_len))
- return 0;
-
- SKB_LINEAR_ASSERT(*pskb);
-
- iph = ip_hdr(*pskb);
- tcph = (void *)iph + iph->ihl*4;
-
- oldlen = (*pskb)->len - iph->ihl*4;
- mangle_contents(*pskb, iph->ihl*4 + tcph->doff*4,
- match_offset, match_len, rep_buffer, rep_len);
-
- datalen = (*pskb)->len - iph->ihl*4;
- if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
- tcph->check = 0;
- tcph->check = tcp_v4_check(datalen,
- iph->saddr, iph->daddr,
- csum_partial((char *)tcph,
- datalen, 0));
- } else
- nf_proto_csum_replace2(&tcph->check, *pskb,
- htons(oldlen), htons(datalen), 1);
-
- if (rep_len != match_len) {
- set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
- adjust_tcp_sequence(ntohl(tcph->seq),
- (int)rep_len - (int)match_len,
- ct, ctinfo);
- /* Tell TCP window tracking about seq change */
- ip_conntrack_tcp_update(*pskb, ct, CTINFO2DIR(ctinfo));
- }
- return 1;
-}
-EXPORT_SYMBOL(ip_nat_mangle_tcp_packet);
-
-/* Generic function for mangling variable-length address changes inside
- * NATed UDP connections (like the CONNECT DATA XXXXX MESG XXXXX INDEX XXXXX
- * command in the Amanda protocol)
- *
- * Takes care about all the nasty sequence number changes, checksumming,
- * skb enlargement, ...
- *
- * XXX - This function could be merged with ip_nat_mangle_tcp_packet which
- * should be fairly easy to do.
- */
-int
-ip_nat_mangle_udp_packet(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned int match_offset,
- unsigned int match_len,
- const char *rep_buffer,
- unsigned int rep_len)
-{
- struct iphdr *iph;
- struct udphdr *udph;
- int datalen, oldlen;
-
- /* UDP helpers might accidentally mangle the wrong packet */
- iph = ip_hdr(*pskb);
- if ((*pskb)->len < iph->ihl*4 + sizeof(*udph) +
- match_offset + match_len)
- return 0;
-
- if (!skb_make_writable(pskb, (*pskb)->len))
- return 0;
-
- if (rep_len > match_len
- && rep_len - match_len > skb_tailroom(*pskb)
- && !enlarge_skb(pskb, rep_len - match_len))
- return 0;
-
- iph = ip_hdr(*pskb);
- udph = (void *)iph + iph->ihl*4;
-
- oldlen = (*pskb)->len - iph->ihl*4;
- mangle_contents(*pskb, iph->ihl*4 + sizeof(*udph),
- match_offset, match_len, rep_buffer, rep_len);
-
- /* update the length of the UDP packet */
- datalen = (*pskb)->len - iph->ihl*4;
- udph->len = htons(datalen);
-
- /* fix udp checksum if udp checksum was previously calculated */
- if (!udph->check && (*pskb)->ip_summed != CHECKSUM_PARTIAL)
- return 1;
-
- if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
- udph->check = 0;
- udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
- datalen, IPPROTO_UDP,
- csum_partial((char *)udph,
- datalen, 0));
- if (!udph->check)
- udph->check = CSUM_MANGLED_0;
- } else
- nf_proto_csum_replace2(&udph->check, *pskb,
- htons(oldlen), htons(datalen), 1);
- return 1;
-}
-EXPORT_SYMBOL(ip_nat_mangle_udp_packet);
-
-/* Adjust one found SACK option including checksum correction */
-static void
-sack_adjust(struct sk_buff *skb,
- struct tcphdr *tcph,
- unsigned int sackoff,
- unsigned int sackend,
- struct ip_nat_seq *natseq)
-{
- while (sackoff < sackend) {
- struct tcp_sack_block_wire *sack;
- __be32 new_start_seq, new_end_seq;
-
- sack = (void *)skb->data + sackoff;
- if (after(ntohl(sack->start_seq) - natseq->offset_before,
- natseq->correction_pos))
- new_start_seq = htonl(ntohl(sack->start_seq)
- - natseq->offset_after);
- else
- new_start_seq = htonl(ntohl(sack->start_seq)
- - natseq->offset_before);
-
- if (after(ntohl(sack->end_seq) - natseq->offset_before,
- natseq->correction_pos))
- new_end_seq = htonl(ntohl(sack->end_seq)
- - natseq->offset_after);
- else
- new_end_seq = htonl(ntohl(sack->end_seq)
- - natseq->offset_before);
-
- DEBUGP("sack_adjust: start_seq: %d->%d, end_seq: %d->%d\n",
- ntohl(sack->start_seq), new_start_seq,
- ntohl(sack->end_seq), new_end_seq);
-
- nf_proto_csum_replace4(&tcph->check, skb,
- sack->start_seq, new_start_seq, 0);
- nf_proto_csum_replace4(&tcph->check, skb,
- sack->end_seq, new_end_seq, 0);
- sack->start_seq = new_start_seq;
- sack->end_seq = new_end_seq;
- sackoff += sizeof(*sack);
- }
-}
-
-/* TCP SACK sequence number adjustment */
-static inline unsigned int
-ip_nat_sack_adjust(struct sk_buff **pskb,
- struct tcphdr *tcph,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo)
-{
- unsigned int dir, optoff, optend;
-
- optoff = ip_hdrlen(*pskb) + sizeof(struct tcphdr);
- optend = ip_hdrlen(*pskb) + tcph->doff * 4;
-
- if (!skb_make_writable(pskb, optend))
- return 0;
-
- dir = CTINFO2DIR(ctinfo);
-
- while (optoff < optend) {
- /* Usually: option, length. */
- unsigned char *op = (*pskb)->data + optoff;
-
- switch (op[0]) {
- case TCPOPT_EOL:
- return 1;
- case TCPOPT_NOP:
- optoff++;
- continue;
- default:
- /* no partial options */
- if (optoff + 1 == optend
- || optoff + op[1] > optend
- || op[1] < 2)
- return 0;
- if (op[0] == TCPOPT_SACK
- && op[1] >= 2+TCPOLEN_SACK_PERBLOCK
- && ((op[1] - 2) % TCPOLEN_SACK_PERBLOCK) == 0)
- sack_adjust(*pskb, tcph, optoff+2,
- optoff+op[1],
- &ct->nat.info.seq[!dir]);
- optoff += op[1];
- }
- }
- return 1;
-}
-
-/* TCP sequence number adjustment. Returns 1 on success, 0 on failure */
-int
-ip_nat_seq_adjust(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo)
-{
- struct tcphdr *tcph;
- int dir;
- __be32 newseq, newack;
- struct ip_nat_seq *this_way, *other_way;
-
- dir = CTINFO2DIR(ctinfo);
-
- this_way = &ct->nat.info.seq[dir];
- other_way = &ct->nat.info.seq[!dir];
-
- if (!skb_make_writable(pskb, ip_hdrlen(*pskb) + sizeof(*tcph)))
- return 0;
-
- tcph = (void *)(*pskb)->data + ip_hdrlen(*pskb);
- if (after(ntohl(tcph->seq), this_way->correction_pos))
- newseq = htonl(ntohl(tcph->seq) + this_way->offset_after);
- else
- newseq = htonl(ntohl(tcph->seq) + this_way->offset_before);
-
- if (after(ntohl(tcph->ack_seq) - other_way->offset_before,
- other_way->correction_pos))
- newack = htonl(ntohl(tcph->ack_seq) - other_way->offset_after);
- else
- newack = htonl(ntohl(tcph->ack_seq) - other_way->offset_before);
-
- nf_proto_csum_replace4(&tcph->check, *pskb, tcph->seq, newseq, 0);
- nf_proto_csum_replace4(&tcph->check, *pskb, tcph->ack_seq, newack, 0);
-
- DEBUGP("Adjusting sequence number from %u->%u, ack from %u->%u\n",
- ntohl(tcph->seq), ntohl(newseq), ntohl(tcph->ack_seq),
- ntohl(newack));
-
- tcph->seq = newseq;
- tcph->ack_seq = newack;
-
- if (!ip_nat_sack_adjust(pskb, tcph, ct, ctinfo))
- return 0;
-
- ip_conntrack_tcp_update(*pskb, ct, dir);
-
- return 1;
-}
-EXPORT_SYMBOL(ip_nat_seq_adjust);
-
-/* Setup NAT on this expected conntrack so it follows master. */
-/* If we fail to get a free NAT slot, we'll get dropped on confirm */
-void ip_nat_follow_master(struct ip_conntrack *ct,
- struct ip_conntrack_expect *exp)
-{
- struct ip_nat_range range;
-
- /* This must be a fresh one. */
- BUG_ON(ct->status & IPS_NAT_DONE_MASK);
-
- /* Change src to where master sends to */
- range.flags = IP_NAT_RANGE_MAP_IPS;
- range.min_ip = range.max_ip
- = ct->master->tuplehash[!exp->dir].tuple.dst.ip;
- /* hook doesn't matter, but it has to do source manip */
- ip_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
-
- /* For DST manip, map port here to where it's expected. */
- range.flags = (IP_NAT_RANGE_MAP_IPS | IP_NAT_RANGE_PROTO_SPECIFIED);
- range.min = range.max = exp->saved_proto;
- range.min_ip = range.max_ip
- = ct->master->tuplehash[!exp->dir].tuple.src.ip;
- /* hook doesn't matter, but it has to do destination manip */
- ip_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
-}
-EXPORT_SYMBOL(ip_nat_follow_master);
+++ /dev/null
-/*
- * H.323 extension for NAT alteration.
- *
- * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
- *
- * This source code is licensed under General Public License version 2.
- *
- * Based on the 'brute force' H.323 NAT module by
- * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
- */
-
-#include <linux/module.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/netfilter.h>
-#include <linux/ip.h>
-#include <linux/tcp.h>
-#include <linux/moduleparam.h>
-#include <net/tcp.h>
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_helper.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
-#include <linux/netfilter_ipv4/ip_conntrack_h323.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-/****************************************************************************/
-static int set_addr(struct sk_buff **pskb,
- unsigned char **data, int dataoff,
- unsigned int addroff, __be32 ip, u_int16_t port)
-{
- enum ip_conntrack_info ctinfo;
- struct ip_conntrack *ct = ip_conntrack_get(*pskb, &ctinfo);
- struct {
- __be32 ip;
- __be16 port;
- } __attribute__ ((__packed__)) buf;
- struct tcphdr _tcph, *th;
-
- buf.ip = ip;
- buf.port = htons(port);
- addroff += dataoff;
-
- if (ip_hdr(*pskb)->protocol == IPPROTO_TCP) {
- if (!ip_nat_mangle_tcp_packet(pskb, ct, ctinfo,
- addroff, sizeof(buf),
- (char *) &buf, sizeof(buf))) {
- if (net_ratelimit())
- printk("ip_nat_h323: ip_nat_mangle_tcp_packet"
- " error\n");
- return -1;
- }
-
- /* Relocate data pointer */
- th = skb_header_pointer(*pskb, ip_hdrlen(*pskb),
- sizeof(_tcph), &_tcph);
- if (th == NULL)
- return -1;
- *data = (*pskb)->data + ip_hdrlen(*pskb) +
- th->doff * 4 + dataoff;
- } else {
- if (!ip_nat_mangle_udp_packet(pskb, ct, ctinfo,
- addroff, sizeof(buf),
- (char *) &buf, sizeof(buf))) {
- if (net_ratelimit())
- printk("ip_nat_h323: ip_nat_mangle_udp_packet"
- " error\n");
- return -1;
- }
- /* ip_nat_mangle_udp_packet uses skb_make_writable() to copy
- * or pull everything in a linear buffer, so we can safely
- * use the skb pointers now */
- *data = ((*pskb)->data + ip_hdrlen(*pskb) +
- sizeof(struct udphdr));
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int set_h225_addr(struct sk_buff **pskb,
- unsigned char **data, int dataoff,
- TransportAddress * addr,
- __be32 ip, u_int16_t port)
-{
- return set_addr(pskb, data, dataoff, addr->ipAddress.ip, ip, port);
-}
-
-/****************************************************************************/
-static int set_h245_addr(struct sk_buff **pskb,
- unsigned char **data, int dataoff,
- H245_TransportAddress * addr,
- __be32 ip, u_int16_t port)
-{
- return set_addr(pskb, data, dataoff,
- addr->unicastAddress.iPAddress.network, ip, port);
-}
-
-/****************************************************************************/
-static int set_sig_addr(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data,
- TransportAddress * addr, int count)
-{
- struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
- int dir = CTINFO2DIR(ctinfo);
- int i;
- __be32 ip;
- u_int16_t port;
-
- for (i = 0; i < count; i++) {
- if (get_h225_addr(*data, &addr[i], &ip, &port)) {
- if (ip == ct->tuplehash[dir].tuple.src.ip &&
- port == info->sig_port[dir]) {
- /* GW->GK */
-
- /* Fix for Gnomemeeting */
- if (i > 0 &&
- get_h225_addr(*data, &addr[0],
- &ip, &port) &&
- (ntohl(ip) & 0xff000000) == 0x7f000000)
- i = 0;
-
- DEBUGP
- ("ip_nat_ras: set signal address "
- "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(ip), port,
- NIPQUAD(ct->tuplehash[!dir].tuple.dst.
- ip), info->sig_port[!dir]);
- return set_h225_addr(pskb, data, 0, &addr[i],
- ct->tuplehash[!dir].
- tuple.dst.ip,
- info->sig_port[!dir]);
- } else if (ip == ct->tuplehash[dir].tuple.dst.ip &&
- port == info->sig_port[dir]) {
- /* GK->GW */
- DEBUGP
- ("ip_nat_ras: set signal address "
- "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(ip), port,
- NIPQUAD(ct->tuplehash[!dir].tuple.src.
- ip), info->sig_port[!dir]);
- return set_h225_addr(pskb, data, 0, &addr[i],
- ct->tuplehash[!dir].
- tuple.src.ip,
- info->sig_port[!dir]);
- }
- }
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int set_ras_addr(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data,
- TransportAddress * addr, int count)
-{
- int dir = CTINFO2DIR(ctinfo);
- int i;
- __be32 ip;
- u_int16_t port;
-
- for (i = 0; i < count; i++) {
- if (get_h225_addr(*data, &addr[i], &ip, &port) &&
- ip == ct->tuplehash[dir].tuple.src.ip &&
- port == ntohs(ct->tuplehash[dir].tuple.src.u.udp.port)) {
- DEBUGP("ip_nat_ras: set rasAddress "
- "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(ip), port,
- NIPQUAD(ct->tuplehash[!dir].tuple.dst.ip),
- ntohs(ct->tuplehash[!dir].tuple.dst.u.udp.
- port));
- return set_h225_addr(pskb, data, 0, &addr[i],
- ct->tuplehash[!dir].tuple.dst.ip,
- ntohs(ct->tuplehash[!dir].tuple.
- dst.u.udp.port));
- }
- }
-
- return 0;
-}
-
-/****************************************************************************/
-static int nat_rtp_rtcp(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- H245_TransportAddress * addr,
- u_int16_t port, u_int16_t rtp_port,
- struct ip_conntrack_expect *rtp_exp,
- struct ip_conntrack_expect *rtcp_exp)
-{
- struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
- int dir = CTINFO2DIR(ctinfo);
- int i;
- u_int16_t nated_port;
-
- /* Set expectations for NAT */
- rtp_exp->saved_proto.udp.port = rtp_exp->tuple.dst.u.udp.port;
- rtp_exp->expectfn = ip_nat_follow_master;
- rtp_exp->dir = !dir;
- rtcp_exp->saved_proto.udp.port = rtcp_exp->tuple.dst.u.udp.port;
- rtcp_exp->expectfn = ip_nat_follow_master;
- rtcp_exp->dir = !dir;
-
- /* Lookup existing expects */
- for (i = 0; i < H323_RTP_CHANNEL_MAX; i++) {
- if (info->rtp_port[i][dir] == rtp_port) {
- /* Expected */
-
- /* Use allocated ports first. This will refresh
- * the expects */
- rtp_exp->tuple.dst.u.udp.port =
- htons(info->rtp_port[i][dir]);
- rtcp_exp->tuple.dst.u.udp.port =
- htons(info->rtp_port[i][dir] + 1);
- break;
- } else if (info->rtp_port[i][dir] == 0) {
- /* Not expected */
- break;
- }
- }
-
- /* Run out of expectations */
- if (i >= H323_RTP_CHANNEL_MAX) {
- if (net_ratelimit())
- printk("ip_nat_h323: out of expectations\n");
- return 0;
- }
-
- /* Try to get a pair of ports. */
- for (nated_port = ntohs(rtp_exp->tuple.dst.u.udp.port);
- nated_port != 0; nated_port += 2) {
- rtp_exp->tuple.dst.u.udp.port = htons(nated_port);
- if (ip_conntrack_expect_related(rtp_exp) == 0) {
- rtcp_exp->tuple.dst.u.udp.port =
- htons(nated_port + 1);
- if (ip_conntrack_expect_related(rtcp_exp) == 0)
- break;
- ip_conntrack_unexpect_related(rtp_exp);
- }
- }
-
- if (nated_port == 0) { /* No port available */
- if (net_ratelimit())
- printk("ip_nat_h323: out of RTP ports\n");
- return 0;
- }
-
- /* Modify signal */
- if (set_h245_addr(pskb, data, dataoff, addr,
- ct->tuplehash[!dir].tuple.dst.ip,
- (port & 1) ? nated_port + 1 : nated_port) == 0) {
- /* Save ports */
- info->rtp_port[i][dir] = rtp_port;
- info->rtp_port[i][!dir] = nated_port;
- } else {
- ip_conntrack_unexpect_related(rtp_exp);
- ip_conntrack_unexpect_related(rtcp_exp);
- return -1;
- }
-
- /* Success */
- DEBUGP("ip_nat_h323: expect RTP %u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(rtp_exp->tuple.src.ip),
- ntohs(rtp_exp->tuple.src.u.udp.port),
- NIPQUAD(rtp_exp->tuple.dst.ip),
- ntohs(rtp_exp->tuple.dst.u.udp.port));
- DEBUGP("ip_nat_h323: expect RTCP %u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(rtcp_exp->tuple.src.ip),
- ntohs(rtcp_exp->tuple.src.u.udp.port),
- NIPQUAD(rtcp_exp->tuple.dst.ip),
- ntohs(rtcp_exp->tuple.dst.u.udp.port));
-
- return 0;
-}
-
-/****************************************************************************/
-static int nat_t120(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- H245_TransportAddress * addr, u_int16_t port,
- struct ip_conntrack_expect *exp)
-{
- int dir = CTINFO2DIR(ctinfo);
- u_int16_t nated_port = port;
-
- /* Set expectations for NAT */
- exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
- exp->expectfn = ip_nat_follow_master;
- exp->dir = !dir;
-
- /* Try to get same port: if not, try to change it. */
- for (; nated_port != 0; nated_port++) {
- exp->tuple.dst.u.tcp.port = htons(nated_port);
- if (ip_conntrack_expect_related(exp) == 0)
- break;
- }
-
- if (nated_port == 0) { /* No port available */
- if (net_ratelimit())
- printk("ip_nat_h323: out of TCP ports\n");
- return 0;
- }
-
- /* Modify signal */
- if (set_h245_addr(pskb, data, dataoff, addr,
- ct->tuplehash[!dir].tuple.dst.ip, nated_port) < 0) {
- ip_conntrack_unexpect_related(exp);
- return -1;
- }
-
- DEBUGP("ip_nat_h323: expect T.120 %u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(exp->tuple.src.ip), ntohs(exp->tuple.src.u.tcp.port),
- NIPQUAD(exp->tuple.dst.ip), ntohs(exp->tuple.dst.u.tcp.port));
-
- return 0;
-}
-
-/****************************************************************************
- * This conntrack expect function replaces ip_conntrack_h245_expect()
- * which was set by ip_conntrack_helper_h323.c. It calls both
- * ip_nat_follow_master() and ip_conntrack_h245_expect()
- ****************************************************************************/
-static void ip_nat_h245_expect(struct ip_conntrack *new,
- struct ip_conntrack_expect *this)
-{
- ip_nat_follow_master(new, this);
- ip_conntrack_h245_expect(new, this);
-}
-
-/****************************************************************************/
-static int nat_h245(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- TransportAddress * addr, u_int16_t port,
- struct ip_conntrack_expect *exp)
-{
- struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
- int dir = CTINFO2DIR(ctinfo);
- u_int16_t nated_port = port;
-
- /* Set expectations for NAT */
- exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
- exp->expectfn = ip_nat_h245_expect;
- exp->dir = !dir;
-
- /* Check existing expects */
- if (info->sig_port[dir] == port)
- nated_port = info->sig_port[!dir];
-
- /* Try to get same port: if not, try to change it. */
- for (; nated_port != 0; nated_port++) {
- exp->tuple.dst.u.tcp.port = htons(nated_port);
- if (ip_conntrack_expect_related(exp) == 0)
- break;
- }
-
- if (nated_port == 0) { /* No port available */
- if (net_ratelimit())
- printk("ip_nat_q931: out of TCP ports\n");
- return 0;
- }
-
- /* Modify signal */
- if (set_h225_addr(pskb, data, dataoff, addr,
- ct->tuplehash[!dir].tuple.dst.ip,
- nated_port) == 0) {
- /* Save ports */
- info->sig_port[dir] = port;
- info->sig_port[!dir] = nated_port;
- } else {
- ip_conntrack_unexpect_related(exp);
- return -1;
- }
-
- DEBUGP("ip_nat_q931: expect H.245 %u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(exp->tuple.src.ip), ntohs(exp->tuple.src.u.tcp.port),
- NIPQUAD(exp->tuple.dst.ip), ntohs(exp->tuple.dst.u.tcp.port));
-
- return 0;
-}
-
-/****************************************************************************
- * This conntrack expect function replaces ip_conntrack_q931_expect()
- * which was set by ip_conntrack_helper_h323.c.
- ****************************************************************************/
-static void ip_nat_q931_expect(struct ip_conntrack *new,
- struct ip_conntrack_expect *this)
-{
- struct ip_nat_range range;
-
- if (this->tuple.src.ip != 0) { /* Only accept calls from GK */
- ip_nat_follow_master(new, this);
- goto out;
- }
-
- /* This must be a fresh one. */
- BUG_ON(new->status & IPS_NAT_DONE_MASK);
-
- /* Change src to where master sends to */
- range.flags = IP_NAT_RANGE_MAP_IPS;
- range.min_ip = range.max_ip = new->tuplehash[!this->dir].tuple.src.ip;
-
- /* hook doesn't matter, but it has to do source manip */
- ip_nat_setup_info(new, &range, NF_IP_POST_ROUTING);
-
- /* For DST manip, map port here to where it's expected. */
- range.flags = (IP_NAT_RANGE_MAP_IPS | IP_NAT_RANGE_PROTO_SPECIFIED);
- range.min = range.max = this->saved_proto;
- range.min_ip = range.max_ip =
- new->master->tuplehash[!this->dir].tuple.src.ip;
-
- /* hook doesn't matter, but it has to do destination manip */
- ip_nat_setup_info(new, &range, NF_IP_PRE_ROUTING);
-
- out:
- ip_conntrack_q931_expect(new, this);
-}
-
-/****************************************************************************/
-static int nat_q931(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, TransportAddress * addr, int idx,
- u_int16_t port, struct ip_conntrack_expect *exp)
-{
- struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
- int dir = CTINFO2DIR(ctinfo);
- u_int16_t nated_port = port;
- __be32 ip;
-
- /* Set expectations for NAT */
- exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
- exp->expectfn = ip_nat_q931_expect;
- exp->dir = !dir;
-
- /* Check existing expects */
- if (info->sig_port[dir] == port)
- nated_port = info->sig_port[!dir];
-
- /* Try to get same port: if not, try to change it. */
- for (; nated_port != 0; nated_port++) {
- exp->tuple.dst.u.tcp.port = htons(nated_port);
- if (ip_conntrack_expect_related(exp) == 0)
- break;
- }
-
- if (nated_port == 0) { /* No port available */
- if (net_ratelimit())
- printk("ip_nat_ras: out of TCP ports\n");
- return 0;
- }
-
- /* Modify signal */
- if (set_h225_addr(pskb, data, 0, &addr[idx],
- ct->tuplehash[!dir].tuple.dst.ip,
- nated_port) == 0) {
- /* Save ports */
- info->sig_port[dir] = port;
- info->sig_port[!dir] = nated_port;
-
- /* Fix for Gnomemeeting */
- if (idx > 0 &&
- get_h225_addr(*data, &addr[0], &ip, &port) &&
- (ntohl(ip) & 0xff000000) == 0x7f000000) {
- set_h225_addr_hook(pskb, data, 0, &addr[0],
- ct->tuplehash[!dir].tuple.dst.ip,
- info->sig_port[!dir]);
- }
- } else {
- ip_conntrack_unexpect_related(exp);
- return -1;
- }
-
- /* Success */
- DEBUGP("ip_nat_ras: expect Q.931 %u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(exp->tuple.src.ip), ntohs(exp->tuple.src.u.tcp.port),
- NIPQUAD(exp->tuple.dst.ip), ntohs(exp->tuple.dst.u.tcp.port));
-
- return 0;
-}
-
-/****************************************************************************/
-static void ip_nat_callforwarding_expect(struct ip_conntrack *new,
- struct ip_conntrack_expect *this)
-{
- struct ip_nat_range range;
-
- /* This must be a fresh one. */
- BUG_ON(new->status & IPS_NAT_DONE_MASK);
-
- /* Change src to where master sends to */
- range.flags = IP_NAT_RANGE_MAP_IPS;
- range.min_ip = range.max_ip = new->tuplehash[!this->dir].tuple.src.ip;
-
- /* hook doesn't matter, but it has to do source manip */
- ip_nat_setup_info(new, &range, NF_IP_POST_ROUTING);
-
- /* For DST manip, map port here to where it's expected. */
- range.flags = (IP_NAT_RANGE_MAP_IPS | IP_NAT_RANGE_PROTO_SPECIFIED);
- range.min = range.max = this->saved_proto;
- range.min_ip = range.max_ip = this->saved_ip;
-
- /* hook doesn't matter, but it has to do destination manip */
- ip_nat_setup_info(new, &range, NF_IP_PRE_ROUTING);
-
- ip_conntrack_q931_expect(new, this);
-}
-
-/****************************************************************************/
-static int nat_callforwarding(struct sk_buff **pskb, struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- unsigned char **data, int dataoff,
- TransportAddress * addr, u_int16_t port,
- struct ip_conntrack_expect *exp)
-{
- int dir = CTINFO2DIR(ctinfo);
- u_int16_t nated_port;
-
- /* Set expectations for NAT */
- exp->saved_ip = exp->tuple.dst.ip;
- exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
- exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
- exp->expectfn = ip_nat_callforwarding_expect;
- exp->dir = !dir;
-
- /* Try to get same port: if not, try to change it. */
- for (nated_port = port; nated_port != 0; nated_port++) {
- exp->tuple.dst.u.tcp.port = htons(nated_port);
- if (ip_conntrack_expect_related(exp) == 0)
- break;
- }
-
- if (nated_port == 0) { /* No port available */
- if (net_ratelimit())
- printk("ip_nat_q931: out of TCP ports\n");
- return 0;
- }
-
- /* Modify signal */
- if (!set_h225_addr(pskb, data, dataoff, addr,
- ct->tuplehash[!dir].tuple.dst.ip,
- nated_port) == 0) {
- ip_conntrack_unexpect_related(exp);
- return -1;
- }
-
- /* Success */
- DEBUGP("ip_nat_q931: expect Call Forwarding "
- "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
- NIPQUAD(exp->tuple.src.ip), ntohs(exp->tuple.src.u.tcp.port),
- NIPQUAD(exp->tuple.dst.ip), ntohs(exp->tuple.dst.u.tcp.port));
-
- return 0;
-}
-
-/****************************************************************************/
-static int __init init(void)
-{
- BUG_ON(rcu_dereference(set_h245_addr_hook) != NULL);
- BUG_ON(rcu_dereference(set_h225_addr_hook) != NULL);
- BUG_ON(rcu_dereference(set_sig_addr_hook) != NULL);
- BUG_ON(rcu_dereference(set_ras_addr_hook) != NULL);
- BUG_ON(rcu_dereference(nat_rtp_rtcp_hook) != NULL);
- BUG_ON(rcu_dereference(nat_t120_hook) != NULL);
- BUG_ON(rcu_dereference(nat_h245_hook) != NULL);
- BUG_ON(rcu_dereference(nat_callforwarding_hook) != NULL);
- BUG_ON(rcu_dereference(nat_q931_hook) != NULL);
-
- rcu_assign_pointer(set_h245_addr_hook, set_h245_addr);
- rcu_assign_pointer(set_h225_addr_hook, set_h225_addr);
- rcu_assign_pointer(set_sig_addr_hook, set_sig_addr);
- rcu_assign_pointer(set_ras_addr_hook, set_ras_addr);
- rcu_assign_pointer(nat_rtp_rtcp_hook, nat_rtp_rtcp);
- rcu_assign_pointer(nat_t120_hook, nat_t120);
- rcu_assign_pointer(nat_h245_hook, nat_h245);
- rcu_assign_pointer(nat_callforwarding_hook, nat_callforwarding);
- rcu_assign_pointer(nat_q931_hook, nat_q931);
-
- DEBUGP("ip_nat_h323: init success\n");
- return 0;
-}
-
-/****************************************************************************/
-static void __exit fini(void)
-{
- rcu_assign_pointer(set_h245_addr_hook, NULL);
- rcu_assign_pointer(set_h225_addr_hook, NULL);
- rcu_assign_pointer(set_sig_addr_hook, NULL);
- rcu_assign_pointer(set_ras_addr_hook, NULL);
- rcu_assign_pointer(nat_rtp_rtcp_hook, NULL);
- rcu_assign_pointer(nat_t120_hook, NULL);
- rcu_assign_pointer(nat_h245_hook, NULL);
- rcu_assign_pointer(nat_callforwarding_hook, NULL);
- rcu_assign_pointer(nat_q931_hook, NULL);
- synchronize_rcu();
-}
-
-/****************************************************************************/
-module_init(init);
-module_exit(fini);
-
-MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
-MODULE_DESCRIPTION("H.323 NAT helper");
-MODULE_LICENSE("GPL");
+++ /dev/null
-/*
- * ip_nat_pptp.c - Version 3.0
- *
- * NAT support for PPTP (Point to Point Tunneling Protocol).
- * PPTP is a a protocol for creating virtual private networks.
- * It is a specification defined by Microsoft and some vendors
- * working with Microsoft. PPTP is built on top of a modified
- * version of the Internet Generic Routing Encapsulation Protocol.
- * GRE is defined in RFC 1701 and RFC 1702. Documentation of
- * PPTP can be found in RFC 2637
- *
- * (C) 2000-2005 by Harald Welte <laforge@gnumonks.org>
- *
- * Development of this code funded by Astaro AG (http://www.astaro.com/)
- *
- * TODO: - NAT to a unique tuple, not to TCP source port
- * (needs netfilter tuple reservation)
- *
- * Changes:
- * 2002-02-10 - Version 1.3
- * - Use ip_nat_mangle_tcp_packet() because of cloned skb's
- * in local connections (Philip Craig <philipc@snapgear.com>)
- * - add checks for magicCookie and pptp version
- * - make argument list of pptp_{out,in}bound_packet() shorter
- * - move to C99 style initializers
- * - print version number at module loadtime
- * 2003-09-22 - Version 1.5
- * - use SNATed tcp sourceport as callid, since we get called before
- * TCP header is mangled (Philip Craig <philipc@snapgear.com>)
- * 2004-10-22 - Version 2.0
- * - kernel 2.6.x version
- * 2005-06-10 - Version 3.0
- * - kernel >= 2.6.11 version,
- * funded by Oxcoda NetBox Blue (http://www.netboxblue.com/)
- *
- */
-
-#include <linux/module.h>
-#include <linux/ip.h>
-#include <linux/tcp.h>
-#include <net/tcp.h>
-
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#include <linux/netfilter_ipv4/ip_nat_helper.h>
-#include <linux/netfilter_ipv4/ip_nat_pptp.h>
-#include <linux/netfilter_ipv4/ip_conntrack_core.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h>
-#include <linux/netfilter_ipv4/ip_conntrack_pptp.h>
-
-#define IP_NAT_PPTP_VERSION "3.0"
-
-#define REQ_CID(req, off) (*(__be16 *)((char *)(req) + (off)))
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
-MODULE_DESCRIPTION("Netfilter NAT helper module for PPTP");
-
-
-#if 0
-extern const char *pptp_msg_name[];
-#define DEBUGP(format, args...) printk(KERN_DEBUG "%s:%s: " format, __FILE__, \
- __FUNCTION__, ## args)
-#else
-#define DEBUGP(format, args...)
-#endif
-
-static void pptp_nat_expected(struct ip_conntrack *ct,
- struct ip_conntrack_expect *exp)
-{
- struct ip_conntrack *master = ct->master;
- struct ip_conntrack_expect *other_exp;
- struct ip_conntrack_tuple t;
- struct ip_ct_pptp_master *ct_pptp_info;
- struct ip_nat_pptp *nat_pptp_info;
- struct ip_nat_range range;
-
- ct_pptp_info = &master->help.ct_pptp_info;
- nat_pptp_info = &master->nat.help.nat_pptp_info;
-
- /* And here goes the grand finale of corrosion... */
-
- if (exp->dir == IP_CT_DIR_ORIGINAL) {
- DEBUGP("we are PNS->PAC\n");
- /* therefore, build tuple for PAC->PNS */
- t.src.ip = master->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip;
- t.src.u.gre.key = master->help.ct_pptp_info.pac_call_id;
- t.dst.ip = master->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip;
- t.dst.u.gre.key = master->help.ct_pptp_info.pns_call_id;
- t.dst.protonum = IPPROTO_GRE;
- } else {
- DEBUGP("we are PAC->PNS\n");
- /* build tuple for PNS->PAC */
- t.src.ip = master->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip;
- t.src.u.gre.key = master->nat.help.nat_pptp_info.pns_call_id;
- t.dst.ip = master->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip;
- t.dst.u.gre.key = master->nat.help.nat_pptp_info.pac_call_id;
- t.dst.protonum = IPPROTO_GRE;
- }
-
- DEBUGP("trying to unexpect other dir: ");
- DUMP_TUPLE(&t);
- other_exp = ip_conntrack_expect_find_get(&t);
- if (other_exp) {
- ip_conntrack_unexpect_related(other_exp);
- ip_conntrack_expect_put(other_exp);
- DEBUGP("success\n");
- } else {
- DEBUGP("not found!\n");
- }
-
- /* This must be a fresh one. */
- BUG_ON(ct->status & IPS_NAT_DONE_MASK);
-
- /* Change src to where master sends to */
- range.flags = IP_NAT_RANGE_MAP_IPS;
- range.min_ip = range.max_ip
- = ct->master->tuplehash[!exp->dir].tuple.dst.ip;
- if (exp->dir == IP_CT_DIR_ORIGINAL) {
- range.flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
- range.min = range.max = exp->saved_proto;
- }
- /* hook doesn't matter, but it has to do source manip */
- ip_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
-
- /* For DST manip, map port here to where it's expected. */
- range.flags = IP_NAT_RANGE_MAP_IPS;
- range.min_ip = range.max_ip
- = ct->master->tuplehash[!exp->dir].tuple.src.ip;
- if (exp->dir == IP_CT_DIR_REPLY) {
- range.flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
- range.min = range.max = exp->saved_proto;
- }
- /* hook doesn't matter, but it has to do destination manip */
- ip_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
-}
-
-/* outbound packets == from PNS to PAC */
-static int
-pptp_outbound_pkt(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- struct PptpControlHeader *ctlh,
- union pptp_ctrl_union *pptpReq)
-
-{
- struct ip_ct_pptp_master *ct_pptp_info = &ct->help.ct_pptp_info;
- struct ip_nat_pptp *nat_pptp_info = &ct->nat.help.nat_pptp_info;
- u_int16_t msg;
- __be16 new_callid;
- unsigned int cid_off;
-
- new_callid = ct_pptp_info->pns_call_id;
-
- switch (msg = ntohs(ctlh->messageType)) {
- case PPTP_OUT_CALL_REQUEST:
- cid_off = offsetof(union pptp_ctrl_union, ocreq.callID);
- /* FIXME: ideally we would want to reserve a call ID
- * here. current netfilter NAT core is not able to do
- * this :( For now we use TCP source port. This breaks
- * multiple calls within one control session */
-
- /* save original call ID in nat_info */
- nat_pptp_info->pns_call_id = ct_pptp_info->pns_call_id;
-
- /* don't use tcph->source since we are at a DSTmanip
- * hook (e.g. PREROUTING) and pkt is not mangled yet */
- new_callid = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u.tcp.port;
-
- /* save new call ID in ct info */
- ct_pptp_info->pns_call_id = new_callid;
- break;
- case PPTP_IN_CALL_REPLY:
- cid_off = offsetof(union pptp_ctrl_union, icack.callID);
- break;
- case PPTP_CALL_CLEAR_REQUEST:
- cid_off = offsetof(union pptp_ctrl_union, clrreq.callID);
- break;
- default:
- DEBUGP("unknown outbound packet 0x%04x:%s\n", msg,
- (msg <= PPTP_MSG_MAX)?
- pptp_msg_name[msg]:pptp_msg_name[0]);
- /* fall through */
-
- case PPTP_SET_LINK_INFO:
- /* only need to NAT in case PAC is behind NAT box */
- case PPTP_START_SESSION_REQUEST:
- case PPTP_START_SESSION_REPLY:
- case PPTP_STOP_SESSION_REQUEST:
- case PPTP_STOP_SESSION_REPLY:
- case PPTP_ECHO_REQUEST:
- case PPTP_ECHO_REPLY:
- /* no need to alter packet */
- return NF_ACCEPT;
- }
-
- /* only OUT_CALL_REQUEST, IN_CALL_REPLY, CALL_CLEAR_REQUEST pass
- * down to here */
- DEBUGP("altering call id from 0x%04x to 0x%04x\n",
- ntohs(REQ_CID(pptpReq, cid_off)), ntohs(new_callid));
-
- /* mangle packet */
- if (ip_nat_mangle_tcp_packet(pskb, ct, ctinfo,
- cid_off + sizeof(struct pptp_pkt_hdr) +
- sizeof(struct PptpControlHeader),
- sizeof(new_callid), (char *)&new_callid,
- sizeof(new_callid)) == 0)
- return NF_DROP;
-
- return NF_ACCEPT;
-}
-
-static void
-pptp_exp_gre(struct ip_conntrack_expect *expect_orig,
- struct ip_conntrack_expect *expect_reply)
-{
- struct ip_conntrack *ct = expect_orig->master;
- struct ip_ct_pptp_master *ct_pptp_info = &ct->help.ct_pptp_info;
- struct ip_nat_pptp *nat_pptp_info = &ct->nat.help.nat_pptp_info;
-
- /* save original PAC call ID in nat_info */
- nat_pptp_info->pac_call_id = ct_pptp_info->pac_call_id;
-
- /* alter expectation for PNS->PAC direction */
- expect_orig->saved_proto.gre.key = ct_pptp_info->pns_call_id;
- expect_orig->tuple.src.u.gre.key = nat_pptp_info->pns_call_id;
- expect_orig->tuple.dst.u.gre.key = ct_pptp_info->pac_call_id;
- expect_orig->dir = IP_CT_DIR_ORIGINAL;
-
- /* alter expectation for PAC->PNS direction */
- expect_reply->saved_proto.gre.key = nat_pptp_info->pns_call_id;
- expect_reply->tuple.src.u.gre.key = nat_pptp_info->pac_call_id;
- expect_reply->tuple.dst.u.gre.key = ct_pptp_info->pns_call_id;
- expect_reply->dir = IP_CT_DIR_REPLY;
-}
-
-/* inbound packets == from PAC to PNS */
-static int
-pptp_inbound_pkt(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- struct PptpControlHeader *ctlh,
- union pptp_ctrl_union *pptpReq)
-{
- struct ip_nat_pptp *nat_pptp_info = &ct->nat.help.nat_pptp_info;
- u_int16_t msg;
- __be16 new_pcid;
- unsigned int pcid_off;
-
- new_pcid = nat_pptp_info->pns_call_id;
-
- switch (msg = ntohs(ctlh->messageType)) {
- case PPTP_OUT_CALL_REPLY:
- pcid_off = offsetof(union pptp_ctrl_union, ocack.peersCallID);
- break;
- case PPTP_IN_CALL_CONNECT:
- pcid_off = offsetof(union pptp_ctrl_union, iccon.peersCallID);
- break;
- case PPTP_IN_CALL_REQUEST:
- /* only need to nat in case PAC is behind NAT box */
- return NF_ACCEPT;
- case PPTP_WAN_ERROR_NOTIFY:
- pcid_off = offsetof(union pptp_ctrl_union, wanerr.peersCallID);
- break;
- case PPTP_CALL_DISCONNECT_NOTIFY:
- pcid_off = offsetof(union pptp_ctrl_union, disc.callID);
- break;
- case PPTP_SET_LINK_INFO:
- pcid_off = offsetof(union pptp_ctrl_union, setlink.peersCallID);
- break;
-
- default:
- DEBUGP("unknown inbound packet %s\n", (msg <= PPTP_MSG_MAX)?
- pptp_msg_name[msg]:pptp_msg_name[0]);
- /* fall through */
-
- case PPTP_START_SESSION_REQUEST:
- case PPTP_START_SESSION_REPLY:
- case PPTP_STOP_SESSION_REQUEST:
- case PPTP_STOP_SESSION_REPLY:
- case PPTP_ECHO_REQUEST:
- case PPTP_ECHO_REPLY:
- /* no need to alter packet */
- return NF_ACCEPT;
- }
-
- /* only OUT_CALL_REPLY, IN_CALL_CONNECT, IN_CALL_REQUEST,
- * WAN_ERROR_NOTIFY, CALL_DISCONNECT_NOTIFY pass down here */
-
- /* mangle packet */
- DEBUGP("altering peer call id from 0x%04x to 0x%04x\n",
- ntohs(REQ_CID(pptpReq, pcid_off)), ntohs(new_pcid));
-
- if (ip_nat_mangle_tcp_packet(pskb, ct, ctinfo,
- pcid_off + sizeof(struct pptp_pkt_hdr) +
- sizeof(struct PptpControlHeader),
- sizeof(new_pcid), (char *)&new_pcid,
- sizeof(new_pcid)) == 0)
- return NF_DROP;
- return NF_ACCEPT;
-}
-
-
-extern int __init ip_nat_proto_gre_init(void);
-extern void __exit ip_nat_proto_gre_fini(void);
-
-static int __init ip_nat_helper_pptp_init(void)
-{
- int ret;
-
- DEBUGP("%s: registering NAT helper\n", __FILE__);
-
- ret = ip_nat_proto_gre_init();
- if (ret < 0)
- return ret;
-
- BUG_ON(rcu_dereference(ip_nat_pptp_hook_outbound));
- rcu_assign_pointer(ip_nat_pptp_hook_outbound, pptp_outbound_pkt);
-
- BUG_ON(rcu_dereference(ip_nat_pptp_hook_inbound));
- rcu_assign_pointer(ip_nat_pptp_hook_inbound, pptp_inbound_pkt);
-
- BUG_ON(rcu_dereference(ip_nat_pptp_hook_exp_gre));
- rcu_assign_pointer(ip_nat_pptp_hook_exp_gre, pptp_exp_gre);
-
- BUG_ON(rcu_dereference(ip_nat_pptp_hook_expectfn));
- rcu_assign_pointer(ip_nat_pptp_hook_expectfn, pptp_nat_expected);
-
- printk("ip_nat_pptp version %s loaded\n", IP_NAT_PPTP_VERSION);
- return 0;
-}
-
-static void __exit ip_nat_helper_pptp_fini(void)
-{
- DEBUGP("cleanup_module\n" );
-
- rcu_assign_pointer(ip_nat_pptp_hook_expectfn, NULL);
- rcu_assign_pointer(ip_nat_pptp_hook_exp_gre, NULL);
- rcu_assign_pointer(ip_nat_pptp_hook_inbound, NULL);
- rcu_assign_pointer(ip_nat_pptp_hook_outbound, NULL);
- synchronize_rcu();
-
- ip_nat_proto_gre_fini();
-
- printk("ip_nat_pptp version %s unloaded\n", IP_NAT_PPTP_VERSION);
-}
-
-module_init(ip_nat_helper_pptp_init);
-module_exit(ip_nat_helper_pptp_fini);
+++ /dev/null
-/* IRC extension for TCP NAT alteration.
- * (C) 2000-2001 by Harald Welte <laforge@gnumonks.org>
- * (C) 2004 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
- * based on a copy of RR's ip_nat_ftp.c
- *
- * ip_nat_irc.c,v 1.16 2001/12/06 07:42:10 laforge Exp
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/module.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/ip.h>
-#include <linux/tcp.h>
-#include <linux/kernel.h>
-#include <net/tcp.h>
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_helper.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#include <linux/netfilter_ipv4/ip_conntrack_irc.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/moduleparam.h>
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
-MODULE_DESCRIPTION("IRC (DCC) NAT helper");
-MODULE_LICENSE("GPL");
-
-static unsigned int help(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- unsigned int matchoff,
- unsigned int matchlen,
- struct ip_conntrack_expect *exp)
-{
- u_int16_t port;
- unsigned int ret;
-
- /* "4294967296 65635 " */
- char buffer[18];
-
- DEBUGP("IRC_NAT: info (seq %u + %u) in %u\n",
- expect->seq, exp_irc_info->len,
- ntohl(tcph->seq));
-
- /* Reply comes from server. */
- exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
- exp->dir = IP_CT_DIR_REPLY;
-
- /* When you see the packet, we need to NAT it the same as the
- * this one. */
- exp->expectfn = ip_nat_follow_master;
-
- /* Try to get same port: if not, try to change it. */
- for (port = ntohs(exp->saved_proto.tcp.port); port != 0; port++) {
- exp->tuple.dst.u.tcp.port = htons(port);
- if (ip_conntrack_expect_related(exp) == 0)
- break;
- }
-
- if (port == 0)
- return NF_DROP;
-
- /* strlen("\1DCC CHAT chat AAAAAAAA P\1\n")=27
- * strlen("\1DCC SCHAT chat AAAAAAAA P\1\n")=28
- * strlen("\1DCC SEND F AAAAAAAA P S\1\n")=26
- * strlen("\1DCC MOVE F AAAAAAAA P S\1\n")=26
- * strlen("\1DCC TSEND F AAAAAAAA P S\1\n")=27
- * AAAAAAAAA: bound addr (1.0.0.0==16777216, min 8 digits,
- * 255.255.255.255==4294967296, 10 digits)
- * P: bound port (min 1 d, max 5d (65635))
- * F: filename (min 1 d )
- * S: size (min 1 d )
- * 0x01, \n: terminators
- */
-
- /* AAA = "us", ie. where server normally talks to. */
- sprintf(buffer, "%u %u",
- ntohl(exp->master->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip),
- port);
- DEBUGP("ip_nat_irc: Inserting '%s' == %u.%u.%u.%u, port %u\n",
- buffer, NIPQUAD(exp->tuple.src.ip), port);
-
- ret = ip_nat_mangle_tcp_packet(pskb, exp->master, ctinfo,
- matchoff, matchlen, buffer,
- strlen(buffer));
- if (ret != NF_ACCEPT)
- ip_conntrack_unexpect_related(exp);
- return ret;
-}
-
-static void __exit ip_nat_irc_fini(void)
-{
- rcu_assign_pointer(ip_nat_irc_hook, NULL);
- synchronize_rcu();
-}
-
-static int __init ip_nat_irc_init(void)
-{
- BUG_ON(rcu_dereference(ip_nat_irc_hook));
- rcu_assign_pointer(ip_nat_irc_hook, help);
- return 0;
-}
-
-/* Prior to 2.6.11, we had a ports param. No longer, but don't break users. */
-static int warn_set(const char *val, struct kernel_param *kp)
-{
- printk(KERN_INFO KBUILD_MODNAME
- ": kernel >= 2.6.10 only uses 'ports' for conntrack modules\n");
- return 0;
-}
-module_param_call(ports, warn_set, NULL, NULL, 0);
-
-module_init(ip_nat_irc_init);
-module_exit(ip_nat_irc_fini);
+++ /dev/null
-/*
- * ip_nat_proto_gre.c - Version 2.0
- *
- * NAT protocol helper module for GRE.
- *
- * GRE is a generic encapsulation protocol, which is generally not very
- * suited for NAT, as it has no protocol-specific part as port numbers.
- *
- * It has an optional key field, which may help us distinguishing two
- * connections between the same two hosts.
- *
- * GRE is defined in RFC 1701 and RFC 1702, as well as RFC 2784
- *
- * PPTP is built on top of a modified version of GRE, and has a mandatory
- * field called "CallID", which serves us for the same purpose as the key
- * field in plain GRE.
- *
- * Documentation about PPTP can be found in RFC 2637
- *
- * (C) 2000-2005 by Harald Welte <laforge@gnumonks.org>
- *
- * Development of this code funded by Astaro AG (http://www.astaro.com/)
- *
- */
-
-#include <linux/module.h>
-#include <linux/ip.h>
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#include <linux/netfilter_ipv4/ip_nat_protocol.h>
-#include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h>
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
-MODULE_DESCRIPTION("Netfilter NAT protocol helper module for GRE");
-
-#if 0
-#define DEBUGP(format, args...) printk(KERN_DEBUG "%s:%s: " format, __FILE__, \
- __FUNCTION__, ## args)
-#else
-#define DEBUGP(x, args...)
-#endif
-
-/* is key in given range between min and max */
-static int
-gre_in_range(const struct ip_conntrack_tuple *tuple,
- enum ip_nat_manip_type maniptype,
- const union ip_conntrack_manip_proto *min,
- const union ip_conntrack_manip_proto *max)
-{
- __be16 key;
-
- if (maniptype == IP_NAT_MANIP_SRC)
- key = tuple->src.u.gre.key;
- else
- key = tuple->dst.u.gre.key;
-
- return ntohs(key) >= ntohs(min->gre.key)
- && ntohs(key) <= ntohs(max->gre.key);
-}
-
-/* generate unique tuple ... */
-static int
-gre_unique_tuple(struct ip_conntrack_tuple *tuple,
- const struct ip_nat_range *range,
- enum ip_nat_manip_type maniptype,
- const struct ip_conntrack *conntrack)
-{
- static u_int16_t key;
- __be16 *keyptr;
- unsigned int min, i, range_size;
-
- if (maniptype == IP_NAT_MANIP_SRC)
- keyptr = &tuple->src.u.gre.key;
- else
- keyptr = &tuple->dst.u.gre.key;
-
- if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {
- DEBUGP("%p: NATing GRE PPTP\n", conntrack);
- min = 1;
- range_size = 0xffff;
- } else {
- min = ntohs(range->min.gre.key);
- range_size = ntohs(range->max.gre.key) - min + 1;
- }
-
- DEBUGP("min = %u, range_size = %u\n", min, range_size);
-
- for (i = 0; i < range_size; i++, key++) {
- *keyptr = htons(min + key % range_size);
- if (!ip_nat_used_tuple(tuple, conntrack))
- return 1;
- }
-
- DEBUGP("%p: no NAT mapping\n", conntrack);
-
- return 0;
-}
-
-/* manipulate a GRE packet according to maniptype */
-static int
-gre_manip_pkt(struct sk_buff **pskb,
- unsigned int iphdroff,
- const struct ip_conntrack_tuple *tuple,
- enum ip_nat_manip_type maniptype)
-{
- struct gre_hdr *greh;
- struct gre_hdr_pptp *pgreh;
- struct iphdr *iph = (struct iphdr *)((*pskb)->data + iphdroff);
- unsigned int hdroff = iphdroff + iph->ihl*4;
-
- /* pgreh includes two optional 32bit fields which are not required
- * to be there. That's where the magic '8' comes from */
- if (!skb_make_writable(pskb, hdroff + sizeof(*pgreh)-8))
- return 0;
-
- greh = (void *)(*pskb)->data + hdroff;
- pgreh = (struct gre_hdr_pptp *) greh;
-
- /* we only have destination manip of a packet, since 'source key'
- * is not present in the packet itself */
- if (maniptype == IP_NAT_MANIP_DST) {
- /* key manipulation is always dest */
- switch (greh->version) {
- case 0:
- if (!greh->key) {
- DEBUGP("can't nat GRE w/o key\n");
- break;
- }
- if (greh->csum) {
- /* FIXME: Never tested this code... */
- nf_proto_csum_replace4(gre_csum(greh), *pskb,
- *(gre_key(greh)),
- tuple->dst.u.gre.key, 0);
- }
- *(gre_key(greh)) = tuple->dst.u.gre.key;
- break;
- case GRE_VERSION_PPTP:
- DEBUGP("call_id -> 0x%04x\n",
- ntohs(tuple->dst.u.gre.key));
- pgreh->call_id = tuple->dst.u.gre.key;
- break;
- default:
- DEBUGP("can't nat unknown GRE version\n");
- return 0;
- break;
- }
- }
- return 1;
-}
-
-/* nat helper struct */
-static struct ip_nat_protocol gre = {
- .name = "GRE",
- .protonum = IPPROTO_GRE,
- .manip_pkt = gre_manip_pkt,
- .in_range = gre_in_range,
- .unique_tuple = gre_unique_tuple,
-#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
- defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
- .range_to_nfattr = ip_nat_port_range_to_nfattr,
- .nfattr_to_range = ip_nat_port_nfattr_to_range,
-#endif
-};
-
-int __init ip_nat_proto_gre_init(void)
-{
- return ip_nat_protocol_register(&gre);
-}
-
-void __exit ip_nat_proto_gre_fini(void)
-{
- ip_nat_protocol_unregister(&gre);
-}
+++ /dev/null
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/types.h>
-#include <linux/init.h>
-#include <linux/netfilter.h>
-#include <linux/ip.h>
-#include <linux/icmp.h>
-#include <linux/if.h>
-
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_core.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#include <linux/netfilter_ipv4/ip_nat_protocol.h>
-
-static int
-icmp_in_range(const struct ip_conntrack_tuple *tuple,
- enum ip_nat_manip_type maniptype,
- const union ip_conntrack_manip_proto *min,
- const union ip_conntrack_manip_proto *max)
-{
- return ntohs(tuple->src.u.icmp.id) >= ntohs(min->icmp.id) &&
- ntohs(tuple->src.u.icmp.id) <= ntohs(max->icmp.id);
-}
-
-static int
-icmp_unique_tuple(struct ip_conntrack_tuple *tuple,
- const struct ip_nat_range *range,
- enum ip_nat_manip_type maniptype,
- const struct ip_conntrack *conntrack)
-{
- static u_int16_t id;
- unsigned int range_size;
- unsigned int i;
-
- range_size = ntohs(range->max.icmp.id) - ntohs(range->min.icmp.id) + 1;
- /* If no range specified... */
- if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED))
- range_size = 0xFFFF;
-
- for (i = 0; i < range_size; i++, id++) {
- tuple->src.u.icmp.id = htons(ntohs(range->min.icmp.id) +
- (id % range_size));
- if (!ip_nat_used_tuple(tuple, conntrack))
- return 1;
- }
- return 0;
-}
-
-static int
-icmp_manip_pkt(struct sk_buff **pskb,
- unsigned int iphdroff,
- const struct ip_conntrack_tuple *tuple,
- enum ip_nat_manip_type maniptype)
-{
- struct iphdr *iph = (struct iphdr *)((*pskb)->data + iphdroff);
- struct icmphdr *hdr;
- unsigned int hdroff = iphdroff + iph->ihl*4;
-
- if (!skb_make_writable(pskb, hdroff + sizeof(*hdr)))
- return 0;
-
- hdr = (struct icmphdr *)((*pskb)->data + hdroff);
- nf_proto_csum_replace2(&hdr->checksum, *pskb,
- hdr->un.echo.id, tuple->src.u.icmp.id, 0);
- hdr->un.echo.id = tuple->src.u.icmp.id;
- return 1;
-}
-
-struct ip_nat_protocol ip_nat_protocol_icmp = {
- .name = "ICMP",
- .protonum = IPPROTO_ICMP,
- .me = THIS_MODULE,
- .manip_pkt = icmp_manip_pkt,
- .in_range = icmp_in_range,
- .unique_tuple = icmp_unique_tuple,
-#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
- defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
- .range_to_nfattr = ip_nat_port_range_to_nfattr,
- .nfattr_to_range = ip_nat_port_nfattr_to_range,
-#endif
-};
+++ /dev/null
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/types.h>
-#include <linux/init.h>
-#include <linux/random.h>
-#include <linux/netfilter.h>
-#include <linux/ip.h>
-#include <linux/tcp.h>
-#include <linux/if.h>
-#include <linux/netfilter/nfnetlink_conntrack.h>
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#include <linux/netfilter_ipv4/ip_nat_protocol.h>
-#include <linux/netfilter_ipv4/ip_nat_core.h>
-
-static int
-tcp_in_range(const struct ip_conntrack_tuple *tuple,
- enum ip_nat_manip_type maniptype,
- const union ip_conntrack_manip_proto *min,
- const union ip_conntrack_manip_proto *max)
-{
- __be16 port;
-
- if (maniptype == IP_NAT_MANIP_SRC)
- port = tuple->src.u.tcp.port;
- else
- port = tuple->dst.u.tcp.port;
-
- return ntohs(port) >= ntohs(min->tcp.port)
- && ntohs(port) <= ntohs(max->tcp.port);
-}
-
-static int
-tcp_unique_tuple(struct ip_conntrack_tuple *tuple,
- const struct ip_nat_range *range,
- enum ip_nat_manip_type maniptype,
- const struct ip_conntrack *conntrack)
-{
- static u_int16_t port;
- __be16 *portptr;
- unsigned int range_size, min, i;
-
- if (maniptype == IP_NAT_MANIP_SRC)
- portptr = &tuple->src.u.tcp.port;
- else
- portptr = &tuple->dst.u.tcp.port;
-
- /* If no range specified... */
- if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {
- /* If it's dst rewrite, can't change port */
- if (maniptype == IP_NAT_MANIP_DST)
- return 0;
-
- /* Map privileged onto privileged. */
- if (ntohs(*portptr) < 1024) {
- /* Loose convention: >> 512 is credential passing */
- if (ntohs(*portptr)<512) {
- min = 1;
- range_size = 511 - min + 1;
- } else {
- min = 600;
- range_size = 1023 - min + 1;
- }
- } else {
- min = 1024;
- range_size = 65535 - 1024 + 1;
- }
- } else {
- min = ntohs(range->min.tcp.port);
- range_size = ntohs(range->max.tcp.port) - min + 1;
- }
-
- /* Start from random port to avoid prediction */
- if (range->flags & IP_NAT_RANGE_PROTO_RANDOM)
- port = net_random();
-
- for (i = 0; i < range_size; i++, port++) {
- *portptr = htons(min + port % range_size);
- if (!ip_nat_used_tuple(tuple, conntrack)) {
- return 1;
- }
- }
- return 0;
-}
-
-static int
-tcp_manip_pkt(struct sk_buff **pskb,
- unsigned int iphdroff,
- const struct ip_conntrack_tuple *tuple,
- enum ip_nat_manip_type maniptype)
-{
- struct iphdr *iph = (struct iphdr *)((*pskb)->data + iphdroff);
- struct tcphdr *hdr;
- unsigned int hdroff = iphdroff + iph->ihl*4;
- __be32 oldip, newip;
- __be16 *portptr, newport, oldport;
- int hdrsize = 8; /* TCP connection tracking guarantees this much */
-
- /* this could be a inner header returned in icmp packet; in such
- cases we cannot update the checksum field since it is outside of
- the 8 bytes of transport layer headers we are guaranteed */
- if ((*pskb)->len >= hdroff + sizeof(struct tcphdr))
- hdrsize = sizeof(struct tcphdr);
-
- if (!skb_make_writable(pskb, hdroff + hdrsize))
- return 0;
-
- iph = (struct iphdr *)((*pskb)->data + iphdroff);
- hdr = (struct tcphdr *)((*pskb)->data + hdroff);
-
- if (maniptype == IP_NAT_MANIP_SRC) {
- /* Get rid of src ip and src pt */
- oldip = iph->saddr;
- newip = tuple->src.ip;
- newport = tuple->src.u.tcp.port;
- portptr = &hdr->source;
- } else {
- /* Get rid of dst ip and dst pt */
- oldip = iph->daddr;
- newip = tuple->dst.ip;
- newport = tuple->dst.u.tcp.port;
- portptr = &hdr->dest;
- }
-
- oldport = *portptr;
- *portptr = newport;
-
- if (hdrsize < sizeof(*hdr))
- return 1;
-
- nf_proto_csum_replace4(&hdr->check, *pskb, oldip, newip, 1);
- nf_proto_csum_replace2(&hdr->check, *pskb, oldport, newport, 0);
- return 1;
-}
-
-struct ip_nat_protocol ip_nat_protocol_tcp = {
- .name = "TCP",
- .protonum = IPPROTO_TCP,
- .me = THIS_MODULE,
- .manip_pkt = tcp_manip_pkt,
- .in_range = tcp_in_range,
- .unique_tuple = tcp_unique_tuple,
-#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
- defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
- .range_to_nfattr = ip_nat_port_range_to_nfattr,
- .nfattr_to_range = ip_nat_port_nfattr_to_range,
-#endif
-};
+++ /dev/null
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/types.h>
-#include <linux/init.h>
-#include <linux/random.h>
-#include <linux/netfilter.h>
-#include <linux/ip.h>
-#include <linux/udp.h>
-#include <linux/if.h>
-
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_core.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#include <linux/netfilter_ipv4/ip_nat_protocol.h>
-
-static int
-udp_in_range(const struct ip_conntrack_tuple *tuple,
- enum ip_nat_manip_type maniptype,
- const union ip_conntrack_manip_proto *min,
- const union ip_conntrack_manip_proto *max)
-{
- __be16 port;
-
- if (maniptype == IP_NAT_MANIP_SRC)
- port = tuple->src.u.udp.port;
- else
- port = tuple->dst.u.udp.port;
-
- return ntohs(port) >= ntohs(min->udp.port)
- && ntohs(port) <= ntohs(max->udp.port);
-}
-
-static int
-udp_unique_tuple(struct ip_conntrack_tuple *tuple,
- const struct ip_nat_range *range,
- enum ip_nat_manip_type maniptype,
- const struct ip_conntrack *conntrack)
-{
- static u_int16_t port;
- __be16 *portptr;
- unsigned int range_size, min, i;
-
- if (maniptype == IP_NAT_MANIP_SRC)
- portptr = &tuple->src.u.udp.port;
- else
- portptr = &tuple->dst.u.udp.port;
-
- /* If no range specified... */
- if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {
- /* If it's dst rewrite, can't change port */
- if (maniptype == IP_NAT_MANIP_DST)
- return 0;
-
- if (ntohs(*portptr) < 1024) {
- /* Loose convention: >> 512 is credential passing */
- if (ntohs(*portptr)<512) {
- min = 1;
- range_size = 511 - min + 1;
- } else {
- min = 600;
- range_size = 1023 - min + 1;
- }
- } else {
- min = 1024;
- range_size = 65535 - 1024 + 1;
- }
- } else {
- min = ntohs(range->min.udp.port);
- range_size = ntohs(range->max.udp.port) - min + 1;
- }
-
- /* Start from random port to avoid prediction */
- if (range->flags & IP_NAT_RANGE_PROTO_RANDOM)
- port = net_random();
-
- for (i = 0; i < range_size; i++, port++) {
- *portptr = htons(min + port % range_size);
- if (!ip_nat_used_tuple(tuple, conntrack))
- return 1;
- }
- return 0;
-}
-
-static int
-udp_manip_pkt(struct sk_buff **pskb,
- unsigned int iphdroff,
- const struct ip_conntrack_tuple *tuple,
- enum ip_nat_manip_type maniptype)
-{
- struct iphdr *iph = (struct iphdr *)((*pskb)->data + iphdroff);
- struct udphdr *hdr;
- unsigned int hdroff = iphdroff + iph->ihl*4;
- __be32 oldip, newip;
- __be16 *portptr, newport;
-
- if (!skb_make_writable(pskb, hdroff + sizeof(*hdr)))
- return 0;
-
- iph = (struct iphdr *)((*pskb)->data + iphdroff);
- hdr = (struct udphdr *)((*pskb)->data + hdroff);
-
- if (maniptype == IP_NAT_MANIP_SRC) {
- /* Get rid of src ip and src pt */
- oldip = iph->saddr;
- newip = tuple->src.ip;
- newport = tuple->src.u.udp.port;
- portptr = &hdr->source;
- } else {
- /* Get rid of dst ip and dst pt */
- oldip = iph->daddr;
- newip = tuple->dst.ip;
- newport = tuple->dst.u.udp.port;
- portptr = &hdr->dest;
- }
-
- if (hdr->check || (*pskb)->ip_summed == CHECKSUM_PARTIAL) {
- nf_proto_csum_replace4(&hdr->check, *pskb, oldip, newip, 1);
- nf_proto_csum_replace2(&hdr->check, *pskb, *portptr, newport, 0);
- if (!hdr->check)
- hdr->check = CSUM_MANGLED_0;
- }
- *portptr = newport;
- return 1;
-}
-
-struct ip_nat_protocol ip_nat_protocol_udp = {
- .name = "UDP",
- .protonum = IPPROTO_UDP,
- .me = THIS_MODULE,
- .manip_pkt = udp_manip_pkt,
- .in_range = udp_in_range,
- .unique_tuple = udp_unique_tuple,
-#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
- defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
- .range_to_nfattr = ip_nat_port_range_to_nfattr,
- .nfattr_to_range = ip_nat_port_nfattr_to_range,
-#endif
-};
+++ /dev/null
-/* The "unknown" protocol. This is what is used for protocols we
- * don't understand. It's returned by ip_ct_find_proto().
- */
-
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/types.h>
-#include <linux/init.h>
-#include <linux/netfilter.h>
-#include <linux/if.h>
-
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#include <linux/netfilter_ipv4/ip_nat_protocol.h>
-
-static int unknown_in_range(const struct ip_conntrack_tuple *tuple,
- enum ip_nat_manip_type manip_type,
- const union ip_conntrack_manip_proto *min,
- const union ip_conntrack_manip_proto *max)
-{
- return 1;
-}
-
-static int unknown_unique_tuple(struct ip_conntrack_tuple *tuple,
- const struct ip_nat_range *range,
- enum ip_nat_manip_type maniptype,
- const struct ip_conntrack *conntrack)
-{
- /* Sorry: we can't help you; if it's not unique, we can't frob
- anything. */
- return 0;
-}
-
-static int
-unknown_manip_pkt(struct sk_buff **pskb,
- unsigned int iphdroff,
- const struct ip_conntrack_tuple *tuple,
- enum ip_nat_manip_type maniptype)
-{
- return 1;
-}
-
-struct ip_nat_protocol ip_nat_unknown_protocol = {
- .name = "unknown",
- /* .me isn't set: getting a ref to this cannot fail. */
- .manip_pkt = unknown_manip_pkt,
- .in_range = unknown_in_range,
- .unique_tuple = unknown_unique_tuple,
-};
+++ /dev/null
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-/* Everything about the rules for NAT. */
-#include <linux/types.h>
-#include <linux/ip.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/module.h>
-#include <linux/kmod.h>
-#include <linux/skbuff.h>
-#include <linux/proc_fs.h>
-#include <net/checksum.h>
-#include <net/route.h>
-#include <linux/bitops.h>
-
-#include <linux/netfilter_ipv4/ip_tables.h>
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_core.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-#define NAT_VALID_HOOKS ((1<<NF_IP_PRE_ROUTING) | (1<<NF_IP_POST_ROUTING) | (1<<NF_IP_LOCAL_OUT))
-
-static struct
-{
- struct ipt_replace repl;
- struct ipt_standard entries[3];
- struct ipt_error term;
-} nat_initial_table __initdata
-= { { "nat", NAT_VALID_HOOKS, 4,
- sizeof(struct ipt_standard) * 3 + sizeof(struct ipt_error),
- { [NF_IP_PRE_ROUTING] = 0,
- [NF_IP_POST_ROUTING] = sizeof(struct ipt_standard),
- [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 2 },
- { [NF_IP_PRE_ROUTING] = 0,
- [NF_IP_POST_ROUTING] = sizeof(struct ipt_standard),
- [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 2 },
- 0, NULL, { } },
- {
- /* PRE_ROUTING */
- { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
- 0,
- sizeof(struct ipt_entry),
- sizeof(struct ipt_standard),
- 0, { 0, 0 }, { } },
- { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
- -NF_ACCEPT - 1 } },
- /* POST_ROUTING */
- { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
- 0,
- sizeof(struct ipt_entry),
- sizeof(struct ipt_standard),
- 0, { 0, 0 }, { } },
- { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
- -NF_ACCEPT - 1 } },
- /* LOCAL_OUT */
- { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
- 0,
- sizeof(struct ipt_entry),
- sizeof(struct ipt_standard),
- 0, { 0, 0 }, { } },
- { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
- -NF_ACCEPT - 1 } }
- },
- /* ERROR */
- { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
- 0,
- sizeof(struct ipt_entry),
- sizeof(struct ipt_error),
- 0, { 0, 0 }, { } },
- { { { { IPT_ALIGN(sizeof(struct ipt_error_target)), IPT_ERROR_TARGET } },
- { } },
- "ERROR"
- }
- }
-};
-
-static struct xt_table nat_table = {
- .name = "nat",
- .valid_hooks = NAT_VALID_HOOKS,
- .lock = RW_LOCK_UNLOCKED,
- .me = THIS_MODULE,
- .af = AF_INET,
-};
-
-/* Source NAT */
-static unsigned int ipt_snat_target(struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- unsigned int hooknum,
- const struct xt_target *target,
- const void *targinfo)
-{
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
- const struct ip_nat_multi_range_compat *mr = targinfo;
-
- IP_NF_ASSERT(hooknum == NF_IP_POST_ROUTING);
-
- ct = ip_conntrack_get(*pskb, &ctinfo);
-
- /* Connection must be valid and new. */
- IP_NF_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED
- || ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY));
- IP_NF_ASSERT(out);
-
- return ip_nat_setup_info(ct, &mr->range[0], hooknum);
-}
-
-/* Before 2.6.11 we did implicit source NAT if required. Warn about change. */
-static void warn_if_extra_mangle(__be32 dstip, __be32 srcip)
-{
- static int warned = 0;
- struct flowi fl = { .nl_u = { .ip4_u = { .daddr = dstip } } };
- struct rtable *rt;
-
- if (ip_route_output_key(&rt, &fl) != 0)
- return;
-
- if (rt->rt_src != srcip && !warned) {
- printk("NAT: no longer support implicit source local NAT\n");
- printk("NAT: packet src %u.%u.%u.%u -> dst %u.%u.%u.%u\n",
- NIPQUAD(srcip), NIPQUAD(dstip));
- warned = 1;
- }
- ip_rt_put(rt);
-}
-
-static unsigned int ipt_dnat_target(struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- unsigned int hooknum,
- const struct xt_target *target,
- const void *targinfo)
-{
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
- const struct ip_nat_multi_range_compat *mr = targinfo;
-
- IP_NF_ASSERT(hooknum == NF_IP_PRE_ROUTING
- || hooknum == NF_IP_LOCAL_OUT);
-
- ct = ip_conntrack_get(*pskb, &ctinfo);
-
- /* Connection must be valid and new. */
- IP_NF_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
-
- if (hooknum == NF_IP_LOCAL_OUT
- && mr->range[0].flags & IP_NAT_RANGE_MAP_IPS)
- warn_if_extra_mangle(ip_hdr(*pskb)->daddr,
- mr->range[0].min_ip);
-
- return ip_nat_setup_info(ct, &mr->range[0], hooknum);
-}
-
-static int ipt_snat_checkentry(const char *tablename,
- const void *entry,
- const struct xt_target *target,
- void *targinfo,
- unsigned int hook_mask)
-{
- struct ip_nat_multi_range_compat *mr = targinfo;
-
- /* Must be a valid range */
- if (mr->rangesize != 1) {
- printk("SNAT: multiple ranges no longer supported\n");
- return 0;
- }
- return 1;
-}
-
-static int ipt_dnat_checkentry(const char *tablename,
- const void *entry,
- const struct xt_target *target,
- void *targinfo,
- unsigned int hook_mask)
-{
- struct ip_nat_multi_range_compat *mr = targinfo;
-
- /* Must be a valid range */
- if (mr->rangesize != 1) {
- printk("DNAT: multiple ranges no longer supported\n");
- return 0;
- }
- if (mr->range[0].flags & IP_NAT_RANGE_PROTO_RANDOM) {
- printk("DNAT: port randomization not supported\n");
- return 0;
- }
- return 1;
-}
-
-inline unsigned int
-alloc_null_binding(struct ip_conntrack *conntrack,
- struct ip_nat_info *info,
- unsigned int hooknum)
-{
- /* Force range to this IP; let proto decide mapping for
- per-proto parts (hence not IP_NAT_RANGE_PROTO_SPECIFIED).
- Use reply in case it's already been mangled (eg local packet).
- */
- __be32 ip
- = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC
- ? conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip
- : conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip);
- struct ip_nat_range range
- = { IP_NAT_RANGE_MAP_IPS, ip, ip, { 0 }, { 0 } };
-
- DEBUGP("Allocating NULL binding for %p (%u.%u.%u.%u)\n", conntrack,
- NIPQUAD(ip));
- return ip_nat_setup_info(conntrack, &range, hooknum);
-}
-
-unsigned int
-alloc_null_binding_confirmed(struct ip_conntrack *conntrack,
- struct ip_nat_info *info,
- unsigned int hooknum)
-{
- __be32 ip
- = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC
- ? conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip
- : conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip);
- u_int16_t all
- = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC
- ? conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u.all
- : conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.src.u.all);
- struct ip_nat_range range
- = { IP_NAT_RANGE_MAP_IPS, ip, ip, { all }, { all } };
-
- DEBUGP("Allocating NULL binding for confirmed %p (%u.%u.%u.%u)\n",
- conntrack, NIPQUAD(ip));
- return ip_nat_setup_info(conntrack, &range, hooknum);
-}
-
-int ip_nat_rule_find(struct sk_buff **pskb,
- unsigned int hooknum,
- const struct net_device *in,
- const struct net_device *out,
- struct ip_conntrack *ct,
- struct ip_nat_info *info)
-{
- int ret;
-
- ret = ipt_do_table(pskb, hooknum, in, out, &nat_table);
-
- if (ret == NF_ACCEPT) {
- if (!ip_nat_initialized(ct, HOOK2MANIP(hooknum)))
- /* NUL mapping */
- ret = alloc_null_binding(ct, info, hooknum);
- }
- return ret;
-}
-
-static struct xt_target ipt_snat_reg = {
- .name = "SNAT",
- .family = AF_INET,
- .target = ipt_snat_target,
- .targetsize = sizeof(struct ip_nat_multi_range_compat),
- .table = "nat",
- .hooks = 1 << NF_IP_POST_ROUTING,
- .checkentry = ipt_snat_checkentry,
-};
-
-static struct xt_target ipt_dnat_reg = {
- .name = "DNAT",
- .family = AF_INET,
- .target = ipt_dnat_target,
- .targetsize = sizeof(struct ip_nat_multi_range_compat),
- .table = "nat",
- .hooks = (1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_OUT),
- .checkentry = ipt_dnat_checkentry,
-};
-
-int __init ip_nat_rule_init(void)
-{
- int ret;
-
- ret = ipt_register_table(&nat_table, &nat_initial_table.repl);
- if (ret != 0)
- return ret;
- ret = xt_register_target(&ipt_snat_reg);
- if (ret != 0)
- goto unregister_table;
-
- ret = xt_register_target(&ipt_dnat_reg);
- if (ret != 0)
- goto unregister_snat;
-
- return ret;
-
- unregister_snat:
- xt_unregister_target(&ipt_snat_reg);
- unregister_table:
- xt_unregister_table(&nat_table);
-
- return ret;
-}
-
-void ip_nat_rule_cleanup(void)
-{
- xt_unregister_target(&ipt_dnat_reg);
- xt_unregister_target(&ipt_snat_reg);
- ipt_unregister_table(&nat_table);
-}
+++ /dev/null
-/* SIP extension for UDP NAT alteration.
- *
- * (C) 2005 by Christian Hentschel <chentschel@arnet.com.ar>
- * based on RR's ip_nat_ftp.c and other modules.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/ip.h>
-#include <linux/udp.h>
-
-#include <linux/netfilter_ipv4.h>
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_sip.h>
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Christian Hentschel <chentschel@arnet.com.ar>");
-MODULE_DESCRIPTION("SIP NAT helper");
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-struct addr_map {
- struct {
- char src[sizeof("nnn.nnn.nnn.nnn:nnnnn")];
- char dst[sizeof("nnn.nnn.nnn.nnn:nnnnn")];
- unsigned int srclen, srciplen;
- unsigned int dstlen, dstiplen;
- } addr[IP_CT_DIR_MAX];
-};
-
-static void addr_map_init(struct ip_conntrack *ct, struct addr_map *map)
-{
- struct ip_conntrack_tuple *t;
- enum ip_conntrack_dir dir;
- unsigned int n;
-
- for (dir = 0; dir < IP_CT_DIR_MAX; dir++) {
- t = &ct->tuplehash[dir].tuple;
-
- n = sprintf(map->addr[dir].src, "%u.%u.%u.%u",
- NIPQUAD(t->src.ip));
- map->addr[dir].srciplen = n;
- n += sprintf(map->addr[dir].src + n, ":%u",
- ntohs(t->src.u.udp.port));
- map->addr[dir].srclen = n;
-
- n = sprintf(map->addr[dir].dst, "%u.%u.%u.%u",
- NIPQUAD(t->dst.ip));
- map->addr[dir].dstiplen = n;
- n += sprintf(map->addr[dir].dst + n, ":%u",
- ntohs(t->dst.u.udp.port));
- map->addr[dir].dstlen = n;
- }
-}
-
-static int map_sip_addr(struct sk_buff **pskb, enum ip_conntrack_info ctinfo,
- struct ip_conntrack *ct, const char **dptr, size_t dlen,
- enum sip_header_pos pos, struct addr_map *map)
-{
- enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
- unsigned int matchlen, matchoff, addrlen;
- char *addr;
-
- if (ct_sip_get_info(*dptr, dlen, &matchoff, &matchlen, pos) <= 0)
- return 1;
-
- if ((matchlen == map->addr[dir].srciplen ||
- matchlen == map->addr[dir].srclen) &&
- memcmp(*dptr + matchoff, map->addr[dir].src, matchlen) == 0) {
- addr = map->addr[!dir].dst;
- addrlen = map->addr[!dir].dstlen;
- } else if ((matchlen == map->addr[dir].dstiplen ||
- matchlen == map->addr[dir].dstlen) &&
- memcmp(*dptr + matchoff, map->addr[dir].dst, matchlen) == 0) {
- addr = map->addr[!dir].src;
- addrlen = map->addr[!dir].srclen;
- } else
- return 1;
-
- if (!ip_nat_mangle_udp_packet(pskb, ct, ctinfo,
- matchoff, matchlen, addr, addrlen))
- return 0;
- *dptr = (*pskb)->data + ip_hdrlen(*pskb) + sizeof(struct udphdr);
- return 1;
-
-}
-
-static unsigned int ip_nat_sip(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- struct ip_conntrack *ct,
- const char **dptr)
-{
- enum sip_header_pos pos;
- struct addr_map map;
- int dataoff, datalen;
-
- dataoff = ip_hdrlen(*pskb) + sizeof(struct udphdr);
- datalen = (*pskb)->len - dataoff;
- if (datalen < sizeof("SIP/2.0") - 1)
- return NF_DROP;
-
- addr_map_init(ct, &map);
-
- /* Basic rules: requests and responses. */
- if (strncmp(*dptr, "SIP/2.0", sizeof("SIP/2.0") - 1) != 0) {
- /* 10.2: Constructing the REGISTER Request:
- *
- * The "userinfo" and "@" components of the SIP URI MUST NOT
- * be present.
- */
- if (datalen >= sizeof("REGISTER") - 1 &&
- strncmp(*dptr, "REGISTER", sizeof("REGISTER") - 1) == 0)
- pos = POS_REG_REQ_URI;
- else
- pos = POS_REQ_URI;
-
- if (!map_sip_addr(pskb, ctinfo, ct, dptr, datalen, pos, &map))
- return NF_DROP;
- }
-
- if (!map_sip_addr(pskb, ctinfo, ct, dptr, datalen, POS_FROM, &map) ||
- !map_sip_addr(pskb, ctinfo, ct, dptr, datalen, POS_TO, &map) ||
- !map_sip_addr(pskb, ctinfo, ct, dptr, datalen, POS_VIA, &map) ||
- !map_sip_addr(pskb, ctinfo, ct, dptr, datalen, POS_CONTACT, &map))
- return NF_DROP;
- return NF_ACCEPT;
-}
-
-static unsigned int mangle_sip_packet(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- struct ip_conntrack *ct,
- const char **dptr, size_t dlen,
- char *buffer, int bufflen,
- enum sip_header_pos pos)
-{
- unsigned int matchlen, matchoff;
-
- if (ct_sip_get_info(*dptr, dlen, &matchoff, &matchlen, pos) <= 0)
- return 0;
-
- if (!ip_nat_mangle_udp_packet(pskb, ct, ctinfo,
- matchoff, matchlen, buffer, bufflen))
- return 0;
-
- /* We need to reload this. Thanks Patrick. */
- *dptr = (*pskb)->data + ip_hdrlen(*pskb) + sizeof(struct udphdr);
- return 1;
-}
-
-static int mangle_content_len(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- struct ip_conntrack *ct,
- const char *dptr)
-{
- unsigned int dataoff, matchoff, matchlen;
- char buffer[sizeof("65536")];
- int bufflen;
-
- dataoff = ip_hdrlen(*pskb) + sizeof(struct udphdr);
-
- /* Get actual SDP lenght */
- if (ct_sip_get_info(dptr, (*pskb)->len - dataoff, &matchoff,
- &matchlen, POS_SDP_HEADER) > 0) {
-
- /* since ct_sip_get_info() give us a pointer passing 'v='
- we need to add 2 bytes in this count. */
- int c_len = (*pskb)->len - dataoff - matchoff + 2;
-
- /* Now, update SDP lenght */
- if (ct_sip_get_info(dptr, (*pskb)->len - dataoff, &matchoff,
- &matchlen, POS_CONTENT) > 0) {
-
- bufflen = sprintf(buffer, "%u", c_len);
-
- return ip_nat_mangle_udp_packet(pskb, ct, ctinfo,
- matchoff, matchlen,
- buffer, bufflen);
- }
- }
- return 0;
-}
-
-static unsigned int mangle_sdp(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- struct ip_conntrack *ct,
- __be32 newip, u_int16_t port,
- const char *dptr)
-{
- char buffer[sizeof("nnn.nnn.nnn.nnn")];
- unsigned int dataoff, bufflen;
-
- dataoff = ip_hdrlen(*pskb) + sizeof(struct udphdr);
-
- /* Mangle owner and contact info. */
- bufflen = sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(newip));
- if (!mangle_sip_packet(pskb, ctinfo, ct, &dptr, (*pskb)->len - dataoff,
- buffer, bufflen, POS_OWNER))
- return 0;
-
- if (!mangle_sip_packet(pskb, ctinfo, ct, &dptr, (*pskb)->len - dataoff,
- buffer, bufflen, POS_CONNECTION))
- return 0;
-
- /* Mangle media port. */
- bufflen = sprintf(buffer, "%u", port);
- if (!mangle_sip_packet(pskb, ctinfo, ct, &dptr, (*pskb)->len - dataoff,
- buffer, bufflen, POS_MEDIA))
- return 0;
-
- return mangle_content_len(pskb, ctinfo, ct, dptr);
-}
-
-/* So, this packet has hit the connection tracking matching code.
- Mangle it, and change the expectation to match the new version. */
-static unsigned int ip_nat_sdp(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- struct ip_conntrack_expect *exp,
- const char *dptr)
-{
- struct ip_conntrack *ct = exp->master;
- enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
- __be32 newip;
- u_int16_t port;
-
- DEBUGP("ip_nat_sdp():\n");
-
- /* Connection will come from reply */
- newip = ct->tuplehash[!dir].tuple.dst.ip;
-
- exp->tuple.dst.ip = newip;
- exp->saved_proto.udp.port = exp->tuple.dst.u.udp.port;
- exp->dir = !dir;
-
- /* When you see the packet, we need to NAT it the same as the
- this one. */
- exp->expectfn = ip_nat_follow_master;
-
- /* Try to get same port: if not, try to change it. */
- for (port = ntohs(exp->saved_proto.udp.port); port != 0; port++) {
- exp->tuple.dst.u.udp.port = htons(port);
- if (ip_conntrack_expect_related(exp) == 0)
- break;
- }
-
- if (port == 0)
- return NF_DROP;
-
- if (!mangle_sdp(pskb, ctinfo, ct, newip, port, dptr)) {
- ip_conntrack_unexpect_related(exp);
- return NF_DROP;
- }
- return NF_ACCEPT;
-}
-
-static void __exit fini(void)
-{
- rcu_assign_pointer(ip_nat_sip_hook, NULL);
- rcu_assign_pointer(ip_nat_sdp_hook, NULL);
- synchronize_rcu();
-}
-
-static int __init init(void)
-{
- BUG_ON(rcu_dereference(ip_nat_sip_hook));
- BUG_ON(rcu_dereference(ip_nat_sdp_hook));
- rcu_assign_pointer(ip_nat_sip_hook, ip_nat_sip);
- rcu_assign_pointer(ip_nat_sdp_hook, ip_nat_sdp);
- return 0;
-}
-
-module_init(init);
-module_exit(fini);
+++ /dev/null
-/*
- * ip_nat_snmp_basic.c
- *
- * Basic SNMP Application Layer Gateway
- *
- * This IP NAT module is intended for use with SNMP network
- * discovery and monitoring applications where target networks use
- * conflicting private address realms.
- *
- * Static NAT is used to remap the networks from the view of the network
- * management system at the IP layer, and this module remaps some application
- * layer addresses to match.
- *
- * The simplest form of ALG is performed, where only tagged IP addresses
- * are modified. The module does not need to be MIB aware and only scans
- * messages at the ASN.1/BER level.
- *
- * Currently, only SNMPv1 and SNMPv2 are supported.
- *
- * More information on ALG and associated issues can be found in
- * RFC 2962
- *
- * The ASB.1/BER parsing code is derived from the gxsnmp package by Gregory
- * McLean & Jochen Friedrich, stripped down for use in the kernel.
- *
- * Copyright (c) 2000 RP Internet (www.rpi.net.au).
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Author: James Morris <jmorris@intercode.com.au>
- *
- * Updates:
- * 2000-08-06: Convert to new helper API (Harald Welte).
- *
- */
-#include <linux/in.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/moduleparam.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_nat_helper.h>
-#include <linux/ip.h>
-#include <linux/udp.h>
-#include <net/checksum.h>
-#include <net/udp.h>
-#include <asm/uaccess.h>
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
-MODULE_DESCRIPTION("Basic SNMP Application Layer Gateway");
-
-#define SNMP_PORT 161
-#define SNMP_TRAP_PORT 162
-#define NOCT1(n) (*(u8 *)n)
-
-static int debug;
-static DEFINE_SPINLOCK(snmp_lock);
-
-/*
- * Application layer address mapping mimics the NAT mapping, but
- * only for the first octet in this case (a more flexible system
- * can be implemented if needed).
- */
-struct oct1_map
-{
- u_int8_t from;
- u_int8_t to;
-};
-
-
-/*****************************************************************************
- *
- * Basic ASN.1 decoding routines (gxsnmp author Dirk Wisse)
- *
- *****************************************************************************/
-
-/* Class */
-#define ASN1_UNI 0 /* Universal */
-#define ASN1_APL 1 /* Application */
-#define ASN1_CTX 2 /* Context */
-#define ASN1_PRV 3 /* Private */
-
-/* Tag */
-#define ASN1_EOC 0 /* End Of Contents */
-#define ASN1_BOL 1 /* Boolean */
-#define ASN1_INT 2 /* Integer */
-#define ASN1_BTS 3 /* Bit String */
-#define ASN1_OTS 4 /* Octet String */
-#define ASN1_NUL 5 /* Null */
-#define ASN1_OJI 6 /* Object Identifier */
-#define ASN1_OJD 7 /* Object Description */
-#define ASN1_EXT 8 /* External */
-#define ASN1_SEQ 16 /* Sequence */
-#define ASN1_SET 17 /* Set */
-#define ASN1_NUMSTR 18 /* Numerical String */
-#define ASN1_PRNSTR 19 /* Printable String */
-#define ASN1_TEXSTR 20 /* Teletext String */
-#define ASN1_VIDSTR 21 /* Video String */
-#define ASN1_IA5STR 22 /* IA5 String */
-#define ASN1_UNITIM 23 /* Universal Time */
-#define ASN1_GENTIM 24 /* General Time */
-#define ASN1_GRASTR 25 /* Graphical String */
-#define ASN1_VISSTR 26 /* Visible String */
-#define ASN1_GENSTR 27 /* General String */
-
-/* Primitive / Constructed methods*/
-#define ASN1_PRI 0 /* Primitive */
-#define ASN1_CON 1 /* Constructed */
-
-/*
- * Error codes.
- */
-#define ASN1_ERR_NOERROR 0
-#define ASN1_ERR_DEC_EMPTY 2
-#define ASN1_ERR_DEC_EOC_MISMATCH 3
-#define ASN1_ERR_DEC_LENGTH_MISMATCH 4
-#define ASN1_ERR_DEC_BADVALUE 5
-
-/*
- * ASN.1 context.
- */
-struct asn1_ctx
-{
- int error; /* Error condition */
- unsigned char *pointer; /* Octet just to be decoded */
- unsigned char *begin; /* First octet */
- unsigned char *end; /* Octet after last octet */
-};
-
-/*
- * Octet string (not null terminated)
- */
-struct asn1_octstr
-{
- unsigned char *data;
- unsigned int len;
-};
-
-static void asn1_open(struct asn1_ctx *ctx,
- unsigned char *buf,
- unsigned int len)
-{
- ctx->begin = buf;
- ctx->end = buf + len;
- ctx->pointer = buf;
- ctx->error = ASN1_ERR_NOERROR;
-}
-
-static unsigned char asn1_octet_decode(struct asn1_ctx *ctx, unsigned char *ch)
-{
- if (ctx->pointer >= ctx->end) {
- ctx->error = ASN1_ERR_DEC_EMPTY;
- return 0;
- }
- *ch = *(ctx->pointer)++;
- return 1;
-}
-
-static unsigned char asn1_tag_decode(struct asn1_ctx *ctx, unsigned int *tag)
-{
- unsigned char ch;
-
- *tag = 0;
-
- do
- {
- if (!asn1_octet_decode(ctx, &ch))
- return 0;
- *tag <<= 7;
- *tag |= ch & 0x7F;
- } while ((ch & 0x80) == 0x80);
- return 1;
-}
-
-static unsigned char asn1_id_decode(struct asn1_ctx *ctx,
- unsigned int *cls,
- unsigned int *con,
- unsigned int *tag)
-{
- unsigned char ch;
-
- if (!asn1_octet_decode(ctx, &ch))
- return 0;
-
- *cls = (ch & 0xC0) >> 6;
- *con = (ch & 0x20) >> 5;
- *tag = (ch & 0x1F);
-
- if (*tag == 0x1F) {
- if (!asn1_tag_decode(ctx, tag))
- return 0;
- }
- return 1;
-}
-
-static unsigned char asn1_length_decode(struct asn1_ctx *ctx,
- unsigned int *def,
- unsigned int *len)
-{
- unsigned char ch, cnt;
-
- if (!asn1_octet_decode(ctx, &ch))
- return 0;
-
- if (ch == 0x80)
- *def = 0;
- else {
- *def = 1;
-
- if (ch < 0x80)
- *len = ch;
- else {
- cnt = (unsigned char) (ch & 0x7F);
- *len = 0;
-
- while (cnt > 0) {
- if (!asn1_octet_decode(ctx, &ch))
- return 0;
- *len <<= 8;
- *len |= ch;
- cnt--;
- }
- }
- }
- return 1;
-}
-
-static unsigned char asn1_header_decode(struct asn1_ctx *ctx,
- unsigned char **eoc,
- unsigned int *cls,
- unsigned int *con,
- unsigned int *tag)
-{
- unsigned int def, len;
-
- if (!asn1_id_decode(ctx, cls, con, tag))
- return 0;
-
- def = len = 0;
- if (!asn1_length_decode(ctx, &def, &len))
- return 0;
-
- if (def)
- *eoc = ctx->pointer + len;
- else
- *eoc = NULL;
- return 1;
-}
-
-static unsigned char asn1_eoc_decode(struct asn1_ctx *ctx, unsigned char *eoc)
-{
- unsigned char ch;
-
- if (eoc == 0) {
- if (!asn1_octet_decode(ctx, &ch))
- return 0;
-
- if (ch != 0x00) {
- ctx->error = ASN1_ERR_DEC_EOC_MISMATCH;
- return 0;
- }
-
- if (!asn1_octet_decode(ctx, &ch))
- return 0;
-
- if (ch != 0x00) {
- ctx->error = ASN1_ERR_DEC_EOC_MISMATCH;
- return 0;
- }
- return 1;
- } else {
- if (ctx->pointer != eoc) {
- ctx->error = ASN1_ERR_DEC_LENGTH_MISMATCH;
- return 0;
- }
- return 1;
- }
-}
-
-static unsigned char asn1_null_decode(struct asn1_ctx *ctx, unsigned char *eoc)
-{
- ctx->pointer = eoc;
- return 1;
-}
-
-static unsigned char asn1_long_decode(struct asn1_ctx *ctx,
- unsigned char *eoc,
- long *integer)
-{
- unsigned char ch;
- unsigned int len;
-
- if (!asn1_octet_decode(ctx, &ch))
- return 0;
-
- *integer = (signed char) ch;
- len = 1;
-
- while (ctx->pointer < eoc) {
- if (++len > sizeof (long)) {
- ctx->error = ASN1_ERR_DEC_BADVALUE;
- return 0;
- }
-
- if (!asn1_octet_decode(ctx, &ch))
- return 0;
-
- *integer <<= 8;
- *integer |= ch;
- }
- return 1;
-}
-
-static unsigned char asn1_uint_decode(struct asn1_ctx *ctx,
- unsigned char *eoc,
- unsigned int *integer)
-{
- unsigned char ch;
- unsigned int len;
-
- if (!asn1_octet_decode(ctx, &ch))
- return 0;
-
- *integer = ch;
- if (ch == 0) len = 0;
- else len = 1;
-
- while (ctx->pointer < eoc) {
- if (++len > sizeof (unsigned int)) {
- ctx->error = ASN1_ERR_DEC_BADVALUE;
- return 0;
- }
-
- if (!asn1_octet_decode(ctx, &ch))
- return 0;
-
- *integer <<= 8;
- *integer |= ch;
- }
- return 1;
-}
-
-static unsigned char asn1_ulong_decode(struct asn1_ctx *ctx,
- unsigned char *eoc,
- unsigned long *integer)
-{
- unsigned char ch;
- unsigned int len;
-
- if (!asn1_octet_decode(ctx, &ch))
- return 0;
-
- *integer = ch;
- if (ch == 0) len = 0;
- else len = 1;
-
- while (ctx->pointer < eoc) {
- if (++len > sizeof (unsigned long)) {
- ctx->error = ASN1_ERR_DEC_BADVALUE;
- return 0;
- }
-
- if (!asn1_octet_decode(ctx, &ch))
- return 0;
-
- *integer <<= 8;
- *integer |= ch;
- }
- return 1;
-}
-
-static unsigned char asn1_octets_decode(struct asn1_ctx *ctx,
- unsigned char *eoc,
- unsigned char **octets,
- unsigned int *len)
-{
- unsigned char *ptr;
-
- *len = 0;
-
- *octets = kmalloc(eoc - ctx->pointer, GFP_ATOMIC);
- if (*octets == NULL) {
- if (net_ratelimit())
- printk("OOM in bsalg (%d)\n", __LINE__);
- return 0;
- }
-
- ptr = *octets;
- while (ctx->pointer < eoc) {
- if (!asn1_octet_decode(ctx, (unsigned char *)ptr++)) {
- kfree(*octets);
- *octets = NULL;
- return 0;
- }
- (*len)++;
- }
- return 1;
-}
-
-static unsigned char asn1_subid_decode(struct asn1_ctx *ctx,
- unsigned long *subid)
-{
- unsigned char ch;
-
- *subid = 0;
-
- do {
- if (!asn1_octet_decode(ctx, &ch))
- return 0;
-
- *subid <<= 7;
- *subid |= ch & 0x7F;
- } while ((ch & 0x80) == 0x80);
- return 1;
-}
-
-static unsigned char asn1_oid_decode(struct asn1_ctx *ctx,
- unsigned char *eoc,
- unsigned long **oid,
- unsigned int *len)
-{
- unsigned long subid;
- unsigned int size;
- unsigned long *optr;
-
- size = eoc - ctx->pointer + 1;
- *oid = kmalloc(size * sizeof(unsigned long), GFP_ATOMIC);
- if (*oid == NULL) {
- if (net_ratelimit())
- printk("OOM in bsalg (%d)\n", __LINE__);
- return 0;
- }
-
- optr = *oid;
-
- if (!asn1_subid_decode(ctx, &subid)) {
- kfree(*oid);
- *oid = NULL;
- return 0;
- }
-
- if (subid < 40) {
- optr [0] = 0;
- optr [1] = subid;
- } else if (subid < 80) {
- optr [0] = 1;
- optr [1] = subid - 40;
- } else {
- optr [0] = 2;
- optr [1] = subid - 80;
- }
-
- *len = 2;
- optr += 2;
-
- while (ctx->pointer < eoc) {
- if (++(*len) > size) {
- ctx->error = ASN1_ERR_DEC_BADVALUE;
- kfree(*oid);
- *oid = NULL;
- return 0;
- }
-
- if (!asn1_subid_decode(ctx, optr++)) {
- kfree(*oid);
- *oid = NULL;
- return 0;
- }
- }
- return 1;
-}
-
-/*****************************************************************************
- *
- * SNMP decoding routines (gxsnmp author Dirk Wisse)
- *
- *****************************************************************************/
-
-/* SNMP Versions */
-#define SNMP_V1 0
-#define SNMP_V2C 1
-#define SNMP_V2 2
-#define SNMP_V3 3
-
-/* Default Sizes */
-#define SNMP_SIZE_COMM 256
-#define SNMP_SIZE_OBJECTID 128
-#define SNMP_SIZE_BUFCHR 256
-#define SNMP_SIZE_BUFINT 128
-#define SNMP_SIZE_SMALLOBJECTID 16
-
-/* Requests */
-#define SNMP_PDU_GET 0
-#define SNMP_PDU_NEXT 1
-#define SNMP_PDU_RESPONSE 2
-#define SNMP_PDU_SET 3
-#define SNMP_PDU_TRAP1 4
-#define SNMP_PDU_BULK 5
-#define SNMP_PDU_INFORM 6
-#define SNMP_PDU_TRAP2 7
-
-/* Errors */
-#define SNMP_NOERROR 0
-#define SNMP_TOOBIG 1
-#define SNMP_NOSUCHNAME 2
-#define SNMP_BADVALUE 3
-#define SNMP_READONLY 4
-#define SNMP_GENERROR 5
-#define SNMP_NOACCESS 6
-#define SNMP_WRONGTYPE 7
-#define SNMP_WRONGLENGTH 8
-#define SNMP_WRONGENCODING 9
-#define SNMP_WRONGVALUE 10
-#define SNMP_NOCREATION 11
-#define SNMP_INCONSISTENTVALUE 12
-#define SNMP_RESOURCEUNAVAILABLE 13
-#define SNMP_COMMITFAILED 14
-#define SNMP_UNDOFAILED 15
-#define SNMP_AUTHORIZATIONERROR 16
-#define SNMP_NOTWRITABLE 17
-#define SNMP_INCONSISTENTNAME 18
-
-/* General SNMP V1 Traps */
-#define SNMP_TRAP_COLDSTART 0
-#define SNMP_TRAP_WARMSTART 1
-#define SNMP_TRAP_LINKDOWN 2
-#define SNMP_TRAP_LINKUP 3
-#define SNMP_TRAP_AUTFAILURE 4
-#define SNMP_TRAP_EQPNEIGHBORLOSS 5
-#define SNMP_TRAP_ENTSPECIFIC 6
-
-/* SNMPv1 Types */
-#define SNMP_NULL 0
-#define SNMP_INTEGER 1 /* l */
-#define SNMP_OCTETSTR 2 /* c */
-#define SNMP_DISPLAYSTR 2 /* c */
-#define SNMP_OBJECTID 3 /* ul */
-#define SNMP_IPADDR 4 /* uc */
-#define SNMP_COUNTER 5 /* ul */
-#define SNMP_GAUGE 6 /* ul */
-#define SNMP_TIMETICKS 7 /* ul */
-#define SNMP_OPAQUE 8 /* c */
-
-/* Additional SNMPv2 Types */
-#define SNMP_UINTEGER 5 /* ul */
-#define SNMP_BITSTR 9 /* uc */
-#define SNMP_NSAP 10 /* uc */
-#define SNMP_COUNTER64 11 /* ul */
-#define SNMP_NOSUCHOBJECT 12
-#define SNMP_NOSUCHINSTANCE 13
-#define SNMP_ENDOFMIBVIEW 14
-
-union snmp_syntax
-{
- unsigned char uc[0]; /* 8 bit unsigned */
- char c[0]; /* 8 bit signed */
- unsigned long ul[0]; /* 32 bit unsigned */
- long l[0]; /* 32 bit signed */
-};
-
-struct snmp_object
-{
- unsigned long *id;
- unsigned int id_len;
- unsigned short type;
- unsigned int syntax_len;
- union snmp_syntax syntax;
-};
-
-struct snmp_request
-{
- unsigned long id;
- unsigned int error_status;
- unsigned int error_index;
-};
-
-struct snmp_v1_trap
-{
- unsigned long *id;
- unsigned int id_len;
- unsigned long ip_address; /* pointer */
- unsigned int general;
- unsigned int specific;
- unsigned long time;
-};
-
-/* SNMP types */
-#define SNMP_IPA 0
-#define SNMP_CNT 1
-#define SNMP_GGE 2
-#define SNMP_TIT 3
-#define SNMP_OPQ 4
-#define SNMP_C64 6
-
-/* SNMP errors */
-#define SERR_NSO 0
-#define SERR_NSI 1
-#define SERR_EOM 2
-
-static inline void mangle_address(unsigned char *begin,
- unsigned char *addr,
- const struct oct1_map *map,
- __sum16 *check);
-struct snmp_cnv
-{
- unsigned int class;
- unsigned int tag;
- int syntax;
-};
-
-static struct snmp_cnv snmp_conv [] =
-{
- {ASN1_UNI, ASN1_NUL, SNMP_NULL},
- {ASN1_UNI, ASN1_INT, SNMP_INTEGER},
- {ASN1_UNI, ASN1_OTS, SNMP_OCTETSTR},
- {ASN1_UNI, ASN1_OTS, SNMP_DISPLAYSTR},
- {ASN1_UNI, ASN1_OJI, SNMP_OBJECTID},
- {ASN1_APL, SNMP_IPA, SNMP_IPADDR},
- {ASN1_APL, SNMP_CNT, SNMP_COUNTER}, /* Counter32 */
- {ASN1_APL, SNMP_GGE, SNMP_GAUGE}, /* Gauge32 == Unsigned32 */
- {ASN1_APL, SNMP_TIT, SNMP_TIMETICKS},
- {ASN1_APL, SNMP_OPQ, SNMP_OPAQUE},
-
- /* SNMPv2 data types and errors */
- {ASN1_UNI, ASN1_BTS, SNMP_BITSTR},
- {ASN1_APL, SNMP_C64, SNMP_COUNTER64},
- {ASN1_CTX, SERR_NSO, SNMP_NOSUCHOBJECT},
- {ASN1_CTX, SERR_NSI, SNMP_NOSUCHINSTANCE},
- {ASN1_CTX, SERR_EOM, SNMP_ENDOFMIBVIEW},
- {0, 0, -1}
-};
-
-static unsigned char snmp_tag_cls2syntax(unsigned int tag,
- unsigned int cls,
- unsigned short *syntax)
-{
- struct snmp_cnv *cnv;
-
- cnv = snmp_conv;
-
- while (cnv->syntax != -1) {
- if (cnv->tag == tag && cnv->class == cls) {
- *syntax = cnv->syntax;
- return 1;
- }
- cnv++;
- }
- return 0;
-}
-
-static unsigned char snmp_object_decode(struct asn1_ctx *ctx,
- struct snmp_object **obj)
-{
- unsigned int cls, con, tag, len, idlen;
- unsigned short type;
- unsigned char *eoc, *end, *p;
- unsigned long *lp, *id;
- unsigned long ul;
- long l;
-
- *obj = NULL;
- id = NULL;
-
- if (!asn1_header_decode(ctx, &eoc, &cls, &con, &tag))
- return 0;
-
- if (cls != ASN1_UNI || con != ASN1_CON || tag != ASN1_SEQ)
- return 0;
-
- if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
- return 0;
-
- if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_OJI)
- return 0;
-
- if (!asn1_oid_decode(ctx, end, &id, &idlen))
- return 0;
-
- if (!asn1_header_decode(ctx, &end, &cls, &con, &tag)) {
- kfree(id);
- return 0;
- }
-
- if (con != ASN1_PRI) {
- kfree(id);
- return 0;
- }
-
- type = 0;
- if (!snmp_tag_cls2syntax(tag, cls, &type)) {
- kfree(id);
- return 0;
- }
-
- l = 0;
- switch (type) {
- case SNMP_INTEGER:
- len = sizeof(long);
- if (!asn1_long_decode(ctx, end, &l)) {
- kfree(id);
- return 0;
- }
- *obj = kmalloc(sizeof(struct snmp_object) + len,
- GFP_ATOMIC);
- if (*obj == NULL) {
- kfree(id);
- if (net_ratelimit())
- printk("OOM in bsalg (%d)\n", __LINE__);
- return 0;
- }
- (*obj)->syntax.l[0] = l;
- break;
- case SNMP_OCTETSTR:
- case SNMP_OPAQUE:
- if (!asn1_octets_decode(ctx, end, &p, &len)) {
- kfree(id);
- return 0;
- }
- *obj = kmalloc(sizeof(struct snmp_object) + len,
- GFP_ATOMIC);
- if (*obj == NULL) {
- kfree(id);
- if (net_ratelimit())
- printk("OOM in bsalg (%d)\n", __LINE__);
- return 0;
- }
- memcpy((*obj)->syntax.c, p, len);
- kfree(p);
- break;
- case SNMP_NULL:
- case SNMP_NOSUCHOBJECT:
- case SNMP_NOSUCHINSTANCE:
- case SNMP_ENDOFMIBVIEW:
- len = 0;
- *obj = kmalloc(sizeof(struct snmp_object), GFP_ATOMIC);
- if (*obj == NULL) {
- kfree(id);
- if (net_ratelimit())
- printk("OOM in bsalg (%d)\n", __LINE__);
- return 0;
- }
- if (!asn1_null_decode(ctx, end)) {
- kfree(id);
- kfree(*obj);
- *obj = NULL;
- return 0;
- }
- break;
- case SNMP_OBJECTID:
- if (!asn1_oid_decode(ctx, end, (unsigned long **)&lp, &len)) {
- kfree(id);
- return 0;
- }
- len *= sizeof(unsigned long);
- *obj = kmalloc(sizeof(struct snmp_object) + len, GFP_ATOMIC);
- if (*obj == NULL) {
- kfree(lp);
- kfree(id);
- if (net_ratelimit())
- printk("OOM in bsalg (%d)\n", __LINE__);
- return 0;
- }
- memcpy((*obj)->syntax.ul, lp, len);
- kfree(lp);
- break;
- case SNMP_IPADDR:
- if (!asn1_octets_decode(ctx, end, &p, &len)) {
- kfree(id);
- return 0;
- }
- if (len != 4) {
- kfree(p);
- kfree(id);
- return 0;
- }
- *obj = kmalloc(sizeof(struct snmp_object) + len, GFP_ATOMIC);
- if (*obj == NULL) {
- kfree(p);
- kfree(id);
- if (net_ratelimit())
- printk("OOM in bsalg (%d)\n", __LINE__);
- return 0;
- }
- memcpy((*obj)->syntax.uc, p, len);
- kfree(p);
- break;
- case SNMP_COUNTER:
- case SNMP_GAUGE:
- case SNMP_TIMETICKS:
- len = sizeof(unsigned long);
- if (!asn1_ulong_decode(ctx, end, &ul)) {
- kfree(id);
- return 0;
- }
- *obj = kmalloc(sizeof(struct snmp_object) + len, GFP_ATOMIC);
- if (*obj == NULL) {
- kfree(id);
- if (net_ratelimit())
- printk("OOM in bsalg (%d)\n", __LINE__);
- return 0;
- }
- (*obj)->syntax.ul[0] = ul;
- break;
- default:
- kfree(id);
- return 0;
- }
-
- (*obj)->syntax_len = len;
- (*obj)->type = type;
- (*obj)->id = id;
- (*obj)->id_len = idlen;
-
- if (!asn1_eoc_decode(ctx, eoc)) {
- kfree(id);
- kfree(*obj);
- *obj = NULL;
- return 0;
- }
- return 1;
-}
-
-static unsigned char snmp_request_decode(struct asn1_ctx *ctx,
- struct snmp_request *request)
-{
- unsigned int cls, con, tag;
- unsigned char *end;
-
- if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
- return 0;
-
- if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
- return 0;
-
- if (!asn1_ulong_decode(ctx, end, &request->id))
- return 0;
-
- if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
- return 0;
-
- if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
- return 0;
-
- if (!asn1_uint_decode(ctx, end, &request->error_status))
- return 0;
-
- if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
- return 0;
-
- if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
- return 0;
-
- if (!asn1_uint_decode(ctx, end, &request->error_index))
- return 0;
-
- return 1;
-}
-
-/*
- * Fast checksum update for possibly oddly-aligned UDP byte, from the
- * code example in the draft.
- */
-static void fast_csum(__sum16 *csum,
- const unsigned char *optr,
- const unsigned char *nptr,
- int offset)
-{
- unsigned char s[4];
-
- if (offset & 1) {
- s[0] = s[2] = 0;
- s[1] = ~*optr;
- s[3] = *nptr;
- } else {
- s[1] = s[3] = 0;
- s[0] = ~*optr;
- s[2] = *nptr;
- }
-
- *csum = csum_fold(csum_partial(s, 4, ~csum_unfold(*csum)));
-}
-
-/*
- * Mangle IP address.
- * - begin points to the start of the snmp messgae
- * - addr points to the start of the address
- */
-static inline void mangle_address(unsigned char *begin,
- unsigned char *addr,
- const struct oct1_map *map,
- __sum16 *check)
-{
- if (map->from == NOCT1(addr)) {
- u_int32_t old;
-
- if (debug)
- memcpy(&old, (unsigned char *)addr, sizeof(old));
-
- *addr = map->to;
-
- /* Update UDP checksum if being used */
- if (*check) {
- fast_csum(check,
- &map->from, &map->to, addr - begin);
- }
-
- if (debug)
- printk(KERN_DEBUG "bsalg: mapped %u.%u.%u.%u to "
- "%u.%u.%u.%u\n", NIPQUAD(old), NIPQUAD(*addr));
- }
-}
-
-static unsigned char snmp_trap_decode(struct asn1_ctx *ctx,
- struct snmp_v1_trap *trap,
- const struct oct1_map *map,
- __sum16 *check)
-{
- unsigned int cls, con, tag, len;
- unsigned char *end;
-
- if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
- return 0;
-
- if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_OJI)
- return 0;
-
- if (!asn1_oid_decode(ctx, end, &trap->id, &trap->id_len))
- return 0;
-
- if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
- goto err_id_free;
-
- if (!((cls == ASN1_APL && con == ASN1_PRI && tag == SNMP_IPA) ||
- (cls == ASN1_UNI && con == ASN1_PRI && tag == ASN1_OTS)))
- goto err_id_free;
-
- if (!asn1_octets_decode(ctx, end, (unsigned char **)&trap->ip_address, &len))
- goto err_id_free;
-
- /* IPv4 only */
- if (len != 4)
- goto err_addr_free;
-
- mangle_address(ctx->begin, ctx->pointer - 4, map, check);
-
- if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
- goto err_addr_free;
-
- if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
- goto err_addr_free;
-
- if (!asn1_uint_decode(ctx, end, &trap->general))
- goto err_addr_free;
-
- if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
- goto err_addr_free;
-
- if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
- goto err_addr_free;
-
- if (!asn1_uint_decode(ctx, end, &trap->specific))
- goto err_addr_free;
-
- if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
- goto err_addr_free;
-
- if (!((cls == ASN1_APL && con == ASN1_PRI && tag == SNMP_TIT) ||
- (cls == ASN1_UNI && con == ASN1_PRI && tag == ASN1_INT)))
- goto err_addr_free;
-
- if (!asn1_ulong_decode(ctx, end, &trap->time))
- goto err_addr_free;
-
- return 1;
-
-err_addr_free:
- kfree((unsigned long *)trap->ip_address);
-
-err_id_free:
- kfree(trap->id);
-
- return 0;
-}
-
-/*****************************************************************************
- *
- * Misc. routines
- *
- *****************************************************************************/
-
-static void hex_dump(unsigned char *buf, size_t len)
-{
- size_t i;
-
- for (i = 0; i < len; i++) {
- if (i && !(i % 16))
- printk("\n");
- printk("%02x ", *(buf + i));
- }
- printk("\n");
-}
-
-/*
- * Parse and mangle SNMP message according to mapping.
- * (And this is the fucking 'basic' method).
- */
-static int snmp_parse_mangle(unsigned char *msg,
- u_int16_t len,
- const struct oct1_map *map,
- __sum16 *check)
-{
- unsigned char *eoc, *end;
- unsigned int cls, con, tag, vers, pdutype;
- struct asn1_ctx ctx;
- struct asn1_octstr comm;
- struct snmp_object **obj;
-
- if (debug > 1)
- hex_dump(msg, len);
-
- asn1_open(&ctx, msg, len);
-
- /*
- * Start of SNMP message.
- */
- if (!asn1_header_decode(&ctx, &eoc, &cls, &con, &tag))
- return 0;
- if (cls != ASN1_UNI || con != ASN1_CON || tag != ASN1_SEQ)
- return 0;
-
- /*
- * Version 1 or 2 handled.
- */
- if (!asn1_header_decode(&ctx, &end, &cls, &con, &tag))
- return 0;
- if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
- return 0;
- if (!asn1_uint_decode (&ctx, end, &vers))
- return 0;
- if (debug > 1)
- printk(KERN_DEBUG "bsalg: snmp version: %u\n", vers + 1);
- if (vers > 1)
- return 1;
-
- /*
- * Community.
- */
- if (!asn1_header_decode (&ctx, &end, &cls, &con, &tag))
- return 0;
- if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_OTS)
- return 0;
- if (!asn1_octets_decode(&ctx, end, &comm.data, &comm.len))
- return 0;
- if (debug > 1) {
- unsigned int i;
-
- printk(KERN_DEBUG "bsalg: community: ");
- for (i = 0; i < comm.len; i++)
- printk("%c", comm.data[i]);
- printk("\n");
- }
- kfree(comm.data);
-
- /*
- * PDU type
- */
- if (!asn1_header_decode(&ctx, &eoc, &cls, &con, &pdutype))
- return 0;
- if (cls != ASN1_CTX || con != ASN1_CON)
- return 0;
- if (debug > 1) {
- unsigned char *pdus[] = {
- [SNMP_PDU_GET] = "get",
- [SNMP_PDU_NEXT] = "get-next",
- [SNMP_PDU_RESPONSE] = "response",
- [SNMP_PDU_SET] = "set",
- [SNMP_PDU_TRAP1] = "trapv1",
- [SNMP_PDU_BULK] = "bulk",
- [SNMP_PDU_INFORM] = "inform",
- [SNMP_PDU_TRAP2] = "trapv2"
- };
-
- if (pdutype > SNMP_PDU_TRAP2)
- printk(KERN_DEBUG "bsalg: bad pdu type %u\n", pdutype);
- else
- printk(KERN_DEBUG "bsalg: pdu: %s\n", pdus[pdutype]);
- }
- if (pdutype != SNMP_PDU_RESPONSE &&
- pdutype != SNMP_PDU_TRAP1 && pdutype != SNMP_PDU_TRAP2)
- return 1;
-
- /*
- * Request header or v1 trap
- */
- if (pdutype == SNMP_PDU_TRAP1) {
- struct snmp_v1_trap trap;
- unsigned char ret = snmp_trap_decode(&ctx, &trap, map, check);
-
- if (ret) {
- kfree(trap.id);
- kfree((unsigned long *)trap.ip_address);
- } else
- return ret;
-
- } else {
- struct snmp_request req;
-
- if (!snmp_request_decode(&ctx, &req))
- return 0;
-
- if (debug > 1)
- printk(KERN_DEBUG "bsalg: request: id=0x%lx error_status=%u "
- "error_index=%u\n", req.id, req.error_status,
- req.error_index);
- }
-
- /*
- * Loop through objects, look for IP addresses to mangle.
- */
- if (!asn1_header_decode(&ctx, &eoc, &cls, &con, &tag))
- return 0;
-
- if (cls != ASN1_UNI || con != ASN1_CON || tag != ASN1_SEQ)
- return 0;
-
- obj = kmalloc(sizeof(struct snmp_object), GFP_ATOMIC);
- if (obj == NULL) {
- if (net_ratelimit())
- printk(KERN_WARNING "OOM in bsalg(%d)\n", __LINE__);
- return 0;
- }
-
- while (!asn1_eoc_decode(&ctx, eoc)) {
- unsigned int i;
-
- if (!snmp_object_decode(&ctx, obj)) {
- if (*obj) {
- kfree((*obj)->id);
- kfree(*obj);
- }
- kfree(obj);
- return 0;
- }
-
- if (debug > 1) {
- printk(KERN_DEBUG "bsalg: object: ");
- for (i = 0; i < (*obj)->id_len; i++) {
- if (i > 0)
- printk(".");
- printk("%lu", (*obj)->id[i]);
- }
- printk(": type=%u\n", (*obj)->type);
-
- }
-
- if ((*obj)->type == SNMP_IPADDR)
- mangle_address(ctx.begin, ctx.pointer - 4 , map, check);
-
- kfree((*obj)->id);
- kfree(*obj);
- }
- kfree(obj);
-
- if (!asn1_eoc_decode(&ctx, eoc))
- return 0;
-
- return 1;
-}
-
-/*****************************************************************************
- *
- * NAT routines.
- *
- *****************************************************************************/
-
-/*
- * SNMP translation routine.
- */
-static int snmp_translate(struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo,
- struct sk_buff **pskb)
-{
- struct iphdr *iph = ip_hdr(*pskb);
- struct udphdr *udph = (struct udphdr *)((__be32 *)iph + iph->ihl);
- u_int16_t udplen = ntohs(udph->len);
- u_int16_t paylen = udplen - sizeof(struct udphdr);
- int dir = CTINFO2DIR(ctinfo);
- struct oct1_map map;
-
- /*
- * Determine mappping for application layer addresses based
- * on NAT manipulations for the packet.
- */
- if (dir == IP_CT_DIR_ORIGINAL) {
- /* SNAT traps */
- map.from = NOCT1(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip);
- map.to = NOCT1(&ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip);
- } else {
- /* DNAT replies */
- map.from = NOCT1(&ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip);
- map.to = NOCT1(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip);
- }
-
- if (map.from == map.to)
- return NF_ACCEPT;
-
- if (!snmp_parse_mangle((unsigned char *)udph + sizeof(struct udphdr),
- paylen, &map, &udph->check)) {
- if (net_ratelimit())
- printk(KERN_WARNING "bsalg: parser failed\n");
- return NF_DROP;
- }
- return NF_ACCEPT;
-}
-
-/* We don't actually set up expectations, just adjust internal IP
- * addresses if this is being NATted */
-static int help(struct sk_buff **pskb,
- struct ip_conntrack *ct,
- enum ip_conntrack_info ctinfo)
-{
- int dir = CTINFO2DIR(ctinfo);
- unsigned int ret;
- struct iphdr *iph = ip_hdr(*pskb);
- struct udphdr *udph = (struct udphdr *)((u_int32_t *)iph + iph->ihl);
-
- /* SNMP replies and originating SNMP traps get mangled */
- if (udph->source == htons(SNMP_PORT) && dir != IP_CT_DIR_REPLY)
- return NF_ACCEPT;
- if (udph->dest == htons(SNMP_TRAP_PORT) && dir != IP_CT_DIR_ORIGINAL)
- return NF_ACCEPT;
-
- /* No NAT? */
- if (!(ct->status & IPS_NAT_MASK))
- return NF_ACCEPT;
-
- /*
- * Make sure the packet length is ok. So far, we were only guaranteed
- * to have a valid length IP header plus 8 bytes, which means we have
- * enough room for a UDP header. Just verify the UDP length field so we
- * can mess around with the payload.
- */
- if (ntohs(udph->len) != (*pskb)->len - (iph->ihl << 2)) {
- if (net_ratelimit())
- printk(KERN_WARNING "SNMP: dropping malformed packet "
- "src=%u.%u.%u.%u dst=%u.%u.%u.%u\n",
- NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
- return NF_DROP;
- }
-
- if (!skb_make_writable(pskb, (*pskb)->len))
- return NF_DROP;
-
- spin_lock_bh(&snmp_lock);
- ret = snmp_translate(ct, ctinfo, pskb);
- spin_unlock_bh(&snmp_lock);
- return ret;
-}
-
-static struct ip_conntrack_helper snmp_helper = {
- .max_expected = 0,
- .timeout = 180,
- .me = THIS_MODULE,
- .help = help,
- .name = "snmp",
-
- .tuple = {.src = {.u = {.udp = {.port = __constant_htons(SNMP_PORT)}}},
- .dst = {.protonum = IPPROTO_UDP},
- },
- .mask = {.src = {.u = {0xFFFF}},
- .dst = {.protonum = 0xFF},
- },
-};
-
-static struct ip_conntrack_helper snmp_trap_helper = {
- .max_expected = 0,
- .timeout = 180,
- .me = THIS_MODULE,
- .help = help,
- .name = "snmp_trap",
-
- .tuple = {.src = {.u = {.udp = {.port = __constant_htons(SNMP_TRAP_PORT)}}},
- .dst = {.protonum = IPPROTO_UDP},
- },
- .mask = {.src = {.u = {0xFFFF}},
- .dst = {.protonum = 0xFF},
- },
-};
-
-/*****************************************************************************
- *
- * Module stuff.
- *
- *****************************************************************************/
-
-static int __init ip_nat_snmp_basic_init(void)
-{
- int ret = 0;
-
- ret = ip_conntrack_helper_register(&snmp_helper);
- if (ret < 0)
- return ret;
- ret = ip_conntrack_helper_register(&snmp_trap_helper);
- if (ret < 0) {
- ip_conntrack_helper_unregister(&snmp_helper);
- return ret;
- }
- return ret;
-}
-
-static void __exit ip_nat_snmp_basic_fini(void)
-{
- ip_conntrack_helper_unregister(&snmp_helper);
- ip_conntrack_helper_unregister(&snmp_trap_helper);
-}
-
-module_init(ip_nat_snmp_basic_init);
-module_exit(ip_nat_snmp_basic_fini);
-
-module_param(debug, int, 0600);
+++ /dev/null
-/* This file contains all the functions required for the standalone
- ip_nat module.
-
- These are not required by the compatibility layer.
-*/
-
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-/*
- * 23 Apr 2001: Harald Welte <laforge@gnumonks.org>
- * - new API and handling of conntrack/nat helpers
- * - now capable of multiple expectations for one master
- * */
-
-#include <linux/types.h>
-#include <linux/icmp.h>
-#include <linux/ip.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/proc_fs.h>
-#include <net/ip.h>
-#include <net/checksum.h>
-#include <linux/spinlock.h>
-
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#include <linux/netfilter_ipv4/ip_nat_protocol.h>
-#include <linux/netfilter_ipv4/ip_nat_core.h>
-#include <linux/netfilter_ipv4/ip_nat_helper.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
-#include <linux/netfilter_ipv4/ip_conntrack_core.h>
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-#ifdef CONFIG_XFRM
-static void nat_decode_session(struct sk_buff *skb, struct flowi *fl)
-{
- struct ip_conntrack *ct;
- struct ip_conntrack_tuple *t;
- enum ip_conntrack_info ctinfo;
- enum ip_conntrack_dir dir;
- unsigned long statusbit;
-
- ct = ip_conntrack_get(skb, &ctinfo);
- if (ct == NULL)
- return;
- dir = CTINFO2DIR(ctinfo);
- t = &ct->tuplehash[dir].tuple;
-
- if (dir == IP_CT_DIR_ORIGINAL)
- statusbit = IPS_DST_NAT;
- else
- statusbit = IPS_SRC_NAT;
-
- if (ct->status & statusbit) {
- fl->fl4_dst = t->dst.ip;
- if (t->dst.protonum == IPPROTO_TCP ||
- t->dst.protonum == IPPROTO_UDP)
- fl->fl_ip_dport = t->dst.u.tcp.port;
- }
-
- statusbit ^= IPS_NAT_MASK;
-
- if (ct->status & statusbit) {
- fl->fl4_src = t->src.ip;
- if (t->dst.protonum == IPPROTO_TCP ||
- t->dst.protonum == IPPROTO_UDP)
- fl->fl_ip_sport = t->src.u.tcp.port;
- }
-}
-#endif
-
-static unsigned int
-ip_nat_fn(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
- struct ip_nat_info *info;
- /* maniptype == SRC for postrouting. */
- enum ip_nat_manip_type maniptype = HOOK2MANIP(hooknum);
-
- /* We never see fragments: conntrack defrags on pre-routing
- and local-out, and ip_nat_out protects post-routing. */
- IP_NF_ASSERT(!(ip_hdr(*pskb)->frag_off
- & htons(IP_MF|IP_OFFSET)));
-
- ct = ip_conntrack_get(*pskb, &ctinfo);
- /* Can't track? It's not due to stress, or conntrack would
- have dropped it. Hence it's the user's responsibilty to
- packet filter it out, or implement conntrack/NAT for that
- protocol. 8) --RR */
- if (!ct) {
- /* Exception: ICMP redirect to new connection (not in
- hash table yet). We must not let this through, in
- case we're doing NAT to the same network. */
- if (ip_hdr(*pskb)->protocol == IPPROTO_ICMP) {
- struct icmphdr _hdr, *hp;
-
- hp = skb_header_pointer(*pskb, ip_hdrlen(*pskb),
- sizeof(_hdr), &_hdr);
- if (hp != NULL &&
- hp->type == ICMP_REDIRECT)
- return NF_DROP;
- }
- return NF_ACCEPT;
- }
-
- /* Don't try to NAT if this packet is not conntracked */
- if (ct == &ip_conntrack_untracked)
- return NF_ACCEPT;
-
- switch (ctinfo) {
- case IP_CT_RELATED:
- case IP_CT_RELATED+IP_CT_IS_REPLY:
- if (ip_hdr(*pskb)->protocol == IPPROTO_ICMP) {
- if (!ip_nat_icmp_reply_translation(ct, ctinfo,
- hooknum, pskb))
- return NF_DROP;
- else
- return NF_ACCEPT;
- }
- /* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */
- case IP_CT_NEW:
- info = &ct->nat.info;
-
- /* Seen it before? This can happen for loopback, retrans,
- or local packets.. */
- if (!ip_nat_initialized(ct, maniptype)) {
- unsigned int ret;
-
- if (unlikely(is_confirmed(ct)))
- /* NAT module was loaded late */
- ret = alloc_null_binding_confirmed(ct, info,
- hooknum);
- else if (hooknum == NF_IP_LOCAL_IN)
- /* LOCAL_IN hook doesn't have a chain! */
- ret = alloc_null_binding(ct, info, hooknum);
- else
- ret = ip_nat_rule_find(pskb, hooknum,
- in, out, ct,
- info);
-
- if (ret != NF_ACCEPT) {
- return ret;
- }
- } else
- DEBUGP("Already setup manip %s for ct %p\n",
- maniptype == IP_NAT_MANIP_SRC ? "SRC" : "DST",
- ct);
- break;
-
- default:
- /* ESTABLISHED */
- IP_NF_ASSERT(ctinfo == IP_CT_ESTABLISHED
- || ctinfo == (IP_CT_ESTABLISHED+IP_CT_IS_REPLY));
- info = &ct->nat.info;
- }
-
- IP_NF_ASSERT(info);
- return ip_nat_packet(ct, ctinfo, hooknum, pskb);
-}
-
-static unsigned int
-ip_nat_in(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- unsigned int ret;
- __be32 daddr = ip_hdr(*pskb)->daddr;
-
- ret = ip_nat_fn(hooknum, pskb, in, out, okfn);
- if (ret != NF_DROP && ret != NF_STOLEN
- && daddr != ip_hdr(*pskb)->daddr) {
- dst_release((*pskb)->dst);
- (*pskb)->dst = NULL;
- }
- return ret;
-}
-
-static unsigned int
-ip_nat_out(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
-#ifdef CONFIG_XFRM
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
-#endif
- unsigned int ret;
-
- /* root is playing with raw sockets. */
- if ((*pskb)->len < sizeof(struct iphdr)
- || ip_hdrlen(*pskb) < sizeof(struct iphdr))
- return NF_ACCEPT;
-
- ret = ip_nat_fn(hooknum, pskb, in, out, okfn);
-#ifdef CONFIG_XFRM
- if (ret != NF_DROP && ret != NF_STOLEN
- && (ct = ip_conntrack_get(*pskb, &ctinfo)) != NULL) {
- enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
-
- if (ct->tuplehash[dir].tuple.src.ip !=
- ct->tuplehash[!dir].tuple.dst.ip
- || ct->tuplehash[dir].tuple.src.u.all !=
- ct->tuplehash[!dir].tuple.dst.u.all
- )
- return ip_xfrm_me_harder(pskb) == 0 ? ret : NF_DROP;
- }
-#endif
- return ret;
-}
-
-static unsigned int
-ip_nat_local_fn(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
- unsigned int ret;
-
- /* root is playing with raw sockets. */
- if ((*pskb)->len < sizeof(struct iphdr)
- || ip_hdrlen(*pskb) < sizeof(struct iphdr))
- return NF_ACCEPT;
-
- ret = ip_nat_fn(hooknum, pskb, in, out, okfn);
- if (ret != NF_DROP && ret != NF_STOLEN
- && (ct = ip_conntrack_get(*pskb, &ctinfo)) != NULL) {
- enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
-
- if (ct->tuplehash[dir].tuple.dst.ip !=
- ct->tuplehash[!dir].tuple.src.ip) {
- if (ip_route_me_harder(pskb, RTN_UNSPEC))
- ret = NF_DROP;
- }
-#ifdef CONFIG_XFRM
- else if (ct->tuplehash[dir].tuple.dst.u.all !=
- ct->tuplehash[!dir].tuple.src.u.all)
- if (ip_xfrm_me_harder(pskb))
- ret = NF_DROP;
-#endif
-
- }
- return ret;
-}
-
-static unsigned int
-ip_nat_adjust(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
-
- ct = ip_conntrack_get(*pskb, &ctinfo);
- if (ct && test_bit(IPS_SEQ_ADJUST_BIT, &ct->status)) {
- DEBUGP("ip_nat_standalone: adjusting sequence number\n");
- if (!ip_nat_seq_adjust(pskb, ct, ctinfo))
- return NF_DROP;
- }
- return NF_ACCEPT;
-}
-
-/* We must be after connection tracking and before packet filtering. */
-
-static struct nf_hook_ops ip_nat_ops[] = {
- /* Before packet filtering, change destination */
- {
- .hook = ip_nat_in,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_PRE_ROUTING,
- .priority = NF_IP_PRI_NAT_DST,
- },
- /* After packet filtering, change source */
- {
- .hook = ip_nat_out,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_POST_ROUTING,
- .priority = NF_IP_PRI_NAT_SRC,
- },
- /* After conntrack, adjust sequence number */
- {
- .hook = ip_nat_adjust,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_POST_ROUTING,
- .priority = NF_IP_PRI_NAT_SEQ_ADJUST,
- },
- /* Before packet filtering, change destination */
- {
- .hook = ip_nat_local_fn,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_OUT,
- .priority = NF_IP_PRI_NAT_DST,
- },
- /* After packet filtering, change source */
- {
- .hook = ip_nat_fn,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_IN,
- .priority = NF_IP_PRI_NAT_SRC,
- },
- /* After conntrack, adjust sequence number */
- {
- .hook = ip_nat_adjust,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_IN,
- .priority = NF_IP_PRI_NAT_SEQ_ADJUST,
- },
-};
-
-static int __init ip_nat_standalone_init(void)
-{
- int ret = 0;
-
- need_conntrack();
-
-#ifdef CONFIG_XFRM
- BUG_ON(ip_nat_decode_session != NULL);
- ip_nat_decode_session = nat_decode_session;
-#endif
- ret = ip_nat_rule_init();
- if (ret < 0) {
- printk("ip_nat_init: can't setup rules.\n");
- goto cleanup_decode_session;
- }
- ret = nf_register_hooks(ip_nat_ops, ARRAY_SIZE(ip_nat_ops));
- if (ret < 0) {
- printk("ip_nat_init: can't register hooks.\n");
- goto cleanup_rule_init;
- }
- return ret;
-
- cleanup_rule_init:
- ip_nat_rule_cleanup();
- cleanup_decode_session:
-#ifdef CONFIG_XFRM
- ip_nat_decode_session = NULL;
- synchronize_net();
-#endif
- return ret;
-}
-
-static void __exit ip_nat_standalone_fini(void)
-{
- nf_unregister_hooks(ip_nat_ops, ARRAY_SIZE(ip_nat_ops));
- ip_nat_rule_cleanup();
-#ifdef CONFIG_XFRM
- ip_nat_decode_session = NULL;
- synchronize_net();
-#endif
-}
-
-module_init(ip_nat_standalone_init);
-module_exit(ip_nat_standalone_fini);
-
-MODULE_LICENSE("GPL");
+++ /dev/null
-/* (C) 2001-2002 Magnus Boden <mb@ozaba.mine.nu>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Version: 0.0.7
- *
- * Thu 21 Mar 2002 Harald Welte <laforge@gnumonks.org>
- * - Port to newnat API
- *
- * This module currently supports DNAT:
- * iptables -t nat -A PREROUTING -d x.x.x.x -j DNAT --to-dest x.x.x.y
- *
- * and SNAT:
- * iptables -t nat -A POSTROUTING { -j MASQUERADE , -j SNAT --to-source x.x.x.x }
- *
- * It has not been tested with
- * -j SNAT --to-source x.x.x.x-x.x.x.y since I only have one external ip
- * If you do test this please let me know if it works or not.
- *
- */
-
-#include <linux/module.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/ip.h>
-#include <linux/udp.h>
-
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_conntrack_tftp.h>
-#include <linux/netfilter_ipv4/ip_nat_helper.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#include <linux/moduleparam.h>
-
-MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");
-MODULE_DESCRIPTION("tftp NAT helper");
-MODULE_LICENSE("GPL");
-
-static unsigned int help(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- struct ip_conntrack_expect *exp)
-{
- struct ip_conntrack *ct = exp->master;
-
- exp->saved_proto.udp.port
- = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port;
- exp->dir = IP_CT_DIR_REPLY;
- exp->expectfn = ip_nat_follow_master;
- if (ip_conntrack_expect_related(exp) != 0)
- return NF_DROP;
- return NF_ACCEPT;
-}
-
-static void __exit ip_nat_tftp_fini(void)
-{
- rcu_assign_pointer(ip_nat_tftp_hook, NULL);
- synchronize_rcu();
-}
-
-static int __init ip_nat_tftp_init(void)
-{
- BUG_ON(rcu_dereference(ip_nat_tftp_hook));
- rcu_assign_pointer(ip_nat_tftp_hook, help);
- return 0;
-}
-
-module_init(ip_nat_tftp_init);
-module_exit(ip_nat_tftp_fini);
#include <linux/if_arp.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
-
-#include <net/checksum.h>
-
#include <linux/netfilter_arp.h>
-
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_CLUSTERIP.h>
-#include <net/netfilter/nf_conntrack_compat.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/checksum.h>
#define CLUSTERIP_VERSION "0.8"
const void *targinfo)
{
const struct ipt_clusterip_tgt_info *cipinfo = targinfo;
+ struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
- u_int32_t *mark, hash;
+ u_int32_t hash;
/* don't need to clusterip_config_get() here, since refcount
* is only decremented by destroy() - and ip_tables guarantees
* that the ->target() function isn't called after ->destroy() */
- mark = nf_ct_get_mark((*pskb), &ctinfo);
- if (mark == NULL) {
+ ct = nf_ct_get(*pskb, &ctinfo);
+ if (ct == NULL) {
printk(KERN_ERR "CLUSTERIP: no conntrack!\n");
/* FIXME: need to drop invalid ones, since replies
* to outgoing connections of other nodes will be
switch (ctinfo) {
case IP_CT_NEW:
- *mark = hash;
+ ct->mark = hash;
break;
case IP_CT_RELATED:
case IP_CT_RELATED+IP_CT_IS_REPLY:
#ifdef DEBUG_CLUSTERP
DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
#endif
- DEBUGP("hash=%u ct_hash=%u ", hash, *mark);
+ DEBUGP("hash=%u ct_hash=%u ", hash, ct->mark);
if (!clusterip_responsible(cipinfo->config, hash)) {
DEBUGP("not responsible\n");
return NF_DROP;
#include <net/ip.h>
#include <net/checksum.h>
#include <net/route.h>
-#include <linux/netfilter_ipv4.h>
-#ifdef CONFIG_NF_NAT_NEEDED
#include <net/netfilter/nf_nat_rule.h>
-#else
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#endif
+#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/x_tables.h>
MODULE_LICENSE("GPL");
void *targinfo,
unsigned int hook_mask)
{
- const struct ip_nat_multi_range_compat *mr = targinfo;
+ const struct nf_nat_multi_range_compat *mr = targinfo;
if (mr->range[0].flags & IP_NAT_RANGE_MAP_IPS) {
DEBUGP("masquerade_check: bad MAP_IPS.\n");
const struct xt_target *target,
const void *targinfo)
{
-#ifdef CONFIG_NF_NAT_NEEDED
+ struct nf_conn *ct;
struct nf_conn_nat *nat;
-#endif
- struct ip_conntrack *ct;
enum ip_conntrack_info ctinfo;
- struct ip_nat_range newrange;
- const struct ip_nat_multi_range_compat *mr;
+ struct nf_nat_range newrange;
+ const struct nf_nat_multi_range_compat *mr;
struct rtable *rt;
__be32 newsrc;
- IP_NF_ASSERT(hooknum == NF_IP_POST_ROUTING);
+ NF_CT_ASSERT(hooknum == NF_IP_POST_ROUTING);
- ct = ip_conntrack_get(*pskb, &ctinfo);
-#ifdef CONFIG_NF_NAT_NEEDED
+ ct = nf_ct_get(*pskb, &ctinfo);
nat = nfct_nat(ct);
-#endif
- IP_NF_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED
+
+ NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED
|| ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY));
/* Source address is 0.0.0.0 - locally generated packet that is
* probably not supposed to be masqueraded.
*/
-#ifdef CONFIG_NF_NAT_NEEDED
if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip == 0)
-#else
- if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip == 0)
-#endif
return NF_ACCEPT;
mr = targinfo;
}
write_lock_bh(&masq_lock);
-#ifdef CONFIG_NF_NAT_NEEDED
nat->masq_index = out->ifindex;
-#else
- ct->nat.masq_index = out->ifindex;
-#endif
write_unlock_bh(&masq_lock);
/* Transfer from original range. */
- newrange = ((struct ip_nat_range)
+ newrange = ((struct nf_nat_range)
{ mr->range[0].flags | IP_NAT_RANGE_MAP_IPS,
newsrc, newsrc,
mr->range[0].min, mr->range[0].max });
/* Hand modified range to generic setup. */
- return ip_nat_setup_info(ct, &newrange, hooknum);
+ return nf_nat_setup_info(ct, &newrange, hooknum);
}
static inline int
-device_cmp(struct ip_conntrack *i, void *ifindex)
+device_cmp(struct nf_conn *i, void *ifindex)
{
- int ret;
-#ifdef CONFIG_NF_NAT_NEEDED
struct nf_conn_nat *nat = nfct_nat(i);
+ int ret;
if (!nat)
return 0;
-#endif
read_lock_bh(&masq_lock);
-#ifdef CONFIG_NF_NAT_NEEDED
ret = (nat->masq_index == (int)(long)ifindex);
-#else
- ret = (i->nat.masq_index == (int)(long)ifindex);
-#endif
read_unlock_bh(&masq_lock);
return ret;
/* Device was downed. Search entire table for
conntracks which were associated with that device,
and forget them. */
- IP_NF_ASSERT(dev->ifindex != 0);
+ NF_CT_ASSERT(dev->ifindex != 0);
- ip_ct_iterate_cleanup(device_cmp, (void *)(long)dev->ifindex);
+ nf_ct_iterate_cleanup(device_cmp, (void *)(long)dev->ifindex);
}
return NOTIFY_DONE;
/* IP address was deleted. Search entire table for
conntracks which were associated with that device,
and forget them. */
- IP_NF_ASSERT(dev->ifindex != 0);
+ NF_CT_ASSERT(dev->ifindex != 0);
- ip_ct_iterate_cleanup(device_cmp, (void *)(long)dev->ifindex);
+ nf_ct_iterate_cleanup(device_cmp, (void *)(long)dev->ifindex);
}
return NOTIFY_DONE;
.name = "MASQUERADE",
.family = AF_INET,
.target = masquerade_target,
- .targetsize = sizeof(struct ip_nat_multi_range_compat),
+ .targetsize = sizeof(struct nf_nat_multi_range_compat),
.table = "nat",
.hooks = 1 << NF_IP_POST_ROUTING,
.checkentry = masquerade_check,
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/x_tables.h>
-#ifdef CONFIG_NF_NAT_NEEDED
#include <net/netfilter/nf_nat_rule.h>
-#else
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#endif
#define MODULENAME "NETMAP"
MODULE_LICENSE("GPL");
void *targinfo,
unsigned int hook_mask)
{
- const struct ip_nat_multi_range_compat *mr = targinfo;
+ const struct nf_nat_multi_range_compat *mr = targinfo;
if (!(mr->range[0].flags & IP_NAT_RANGE_MAP_IPS)) {
DEBUGP(MODULENAME":check: bad MAP_IPS.\n");
const struct xt_target *target,
const void *targinfo)
{
- struct ip_conntrack *ct;
+ struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
__be32 new_ip, netmask;
- const struct ip_nat_multi_range_compat *mr = targinfo;
- struct ip_nat_range newrange;
+ const struct nf_nat_multi_range_compat *mr = targinfo;
+ struct nf_nat_range newrange;
- IP_NF_ASSERT(hooknum == NF_IP_PRE_ROUTING
+ NF_CT_ASSERT(hooknum == NF_IP_PRE_ROUTING
|| hooknum == NF_IP_POST_ROUTING
|| hooknum == NF_IP_LOCAL_OUT);
- ct = ip_conntrack_get(*pskb, &ctinfo);
+ ct = nf_ct_get(*pskb, &ctinfo);
netmask = ~(mr->range[0].min_ip ^ mr->range[0].max_ip);
new_ip = ip_hdr(*pskb)->saddr & ~netmask;
new_ip |= mr->range[0].min_ip & netmask;
- newrange = ((struct ip_nat_range)
+ newrange = ((struct nf_nat_range)
{ mr->range[0].flags | IP_NAT_RANGE_MAP_IPS,
new_ip, new_ip,
mr->range[0].min, mr->range[0].max });
/* Hand modified range to generic setup. */
- return ip_nat_setup_info(ct, &newrange, hooknum);
+ return nf_nat_setup_info(ct, &newrange, hooknum);
}
static struct xt_target target_module = {
.name = MODULENAME,
.family = AF_INET,
.target = target,
- .targetsize = sizeof(struct ip_nat_multi_range_compat),
+ .targetsize = sizeof(struct nf_nat_multi_range_compat),
.table = "nat",
.hooks = (1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_POST_ROUTING) |
(1 << NF_IP_LOCAL_OUT),
#include <net/checksum.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/x_tables.h>
-#ifdef CONFIG_NF_NAT_NEEDED
#include <net/netfilter/nf_nat_rule.h>
-#else
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#endif
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
void *targinfo,
unsigned int hook_mask)
{
- const struct ip_nat_multi_range_compat *mr = targinfo;
+ const struct nf_nat_multi_range_compat *mr = targinfo;
if (mr->range[0].flags & IP_NAT_RANGE_MAP_IPS) {
DEBUGP("redirect_check: bad MAP_IPS.\n");
const struct xt_target *target,
const void *targinfo)
{
- struct ip_conntrack *ct;
+ struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
__be32 newdst;
- const struct ip_nat_multi_range_compat *mr = targinfo;
- struct ip_nat_range newrange;
+ const struct nf_nat_multi_range_compat *mr = targinfo;
+ struct nf_nat_range newrange;
- IP_NF_ASSERT(hooknum == NF_IP_PRE_ROUTING
+ NF_CT_ASSERT(hooknum == NF_IP_PRE_ROUTING
|| hooknum == NF_IP_LOCAL_OUT);
- ct = ip_conntrack_get(*pskb, &ctinfo);
- IP_NF_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
+ ct = nf_ct_get(*pskb, &ctinfo);
+ NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
/* Local packets: make them go to loopback */
if (hooknum == NF_IP_LOCAL_OUT)
}
/* Transfer from original range. */
- newrange = ((struct ip_nat_range)
+ newrange = ((struct nf_nat_range)
{ mr->range[0].flags | IP_NAT_RANGE_MAP_IPS,
newdst, newdst,
mr->range[0].min, mr->range[0].max });
/* Hand modified range to generic setup. */
- return ip_nat_setup_info(ct, &newrange, hooknum);
+ return nf_nat_setup_info(ct, &newrange, hooknum);
}
static struct xt_target redirect_reg = {
.name = "REDIRECT",
.family = AF_INET,
.target = redirect_target,
- .targetsize = sizeof(struct ip_nat_multi_range_compat),
+ .targetsize = sizeof(struct nf_nat_multi_range_compat),
.table = "nat",
.hooks = (1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_OUT),
.checkentry = redirect_check,
#include <net/checksum.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/x_tables.h>
-#ifdef CONFIG_NF_NAT_NEEDED
#include <net/netfilter/nf_nat_rule.h>
-#else
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#endif
#include <linux/netfilter_ipv4/ipt_SAME.h>
MODULE_LICENSE("GPL");
const struct xt_target *target,
const void *targinfo)
{
- struct ip_conntrack *ct;
+ struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
u_int32_t tmpip, aindex;
__be32 new_ip;
const struct ipt_same_info *same = targinfo;
- struct ip_nat_range newrange;
- const struct ip_conntrack_tuple *t;
+ struct nf_nat_range newrange;
+ const struct nf_conntrack_tuple *t;
- IP_NF_ASSERT(hooknum == NF_IP_PRE_ROUTING ||
+ NF_CT_ASSERT(hooknum == NF_IP_PRE_ROUTING ||
hooknum == NF_IP_POST_ROUTING);
- ct = ip_conntrack_get(*pskb, &ctinfo);
+ ct = nf_ct_get(*pskb, &ctinfo);
t = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
Here we calculate the index in same->iparray which
holds the ipaddress we should use */
-#ifdef CONFIG_NF_NAT_NEEDED
tmpip = ntohl(t->src.u3.ip);
if (!(same->info & IPT_SAME_NODST))
tmpip += ntohl(t->dst.u3.ip);
-#else
- tmpip = ntohl(t->src.ip);
-
- if (!(same->info & IPT_SAME_NODST))
- tmpip += ntohl(t->dst.ip);
-#endif
aindex = tmpip % same->ipnum;
new_ip = htonl(same->iparray[aindex]);
NIPQUAD(new_ip));
/* Transfer from original range. */
- newrange = ((struct ip_nat_range)
+ newrange = ((struct nf_nat_range)
{ same->range[0].flags, new_ip, new_ip,
/* FIXME: Use ports from correct range! */
same->range[0].min, same->range[0].max });
/* Hand modified range to generic setup. */
- return ip_nat_setup_info(ct, &newrange, hooknum);
+ return nf_nat_setup_info(ct, &newrange, hooknum);
}
static struct xt_target same_reg = {
unsigned int addroff, __be32 ip, __be16 port)
{
enum ip_conntrack_info ctinfo;
- struct nf_conn *ct = ip_conntrack_get(*pskb, &ctinfo);
+ struct nf_conn *ct = nf_ct_get(*pskb, &ctinfo);
struct {
__be32 ip;
__be16 port;
static void ip_nat_q931_expect(struct nf_conn *new,
struct nf_conntrack_expect *this)
{
- struct ip_nat_range range;
+ struct nf_nat_range range;
if (this->tuple.src.u3.ip != 0) { /* Only accept calls from GK */
nf_nat_follow_master(new, this);
struct nf_conntrack_tuple t;
struct nf_ct_pptp_master *ct_pptp_info;
struct nf_nat_pptp *nat_pptp_info;
- struct ip_nat_range range;
+ struct nf_nat_range range;
ct_pptp_info = &nfct_help(master)->help.ct_pptp_info;
nat_pptp_info = &nfct_nat(master)->help.nat_pptp_info;
and is also scheduled to replace the old syslog-based ipt_LOG
and ip6t_LOG modules.
+# Rename this to NF_CONNTRACK in a 2.6.25
config NF_CONNTRACK_ENABLED
tristate "Netfilter connection tracking support"
help
To compile it as a module, choose M here. If unsure, say N.
-choice
- prompt "Netfilter connection tracking support"
- depends on NF_CONNTRACK_ENABLED
-
-config NF_CONNTRACK_SUPPORT
- bool "Layer 3 Independent Connection tracking"
- help
- Layer 3 independent connection tracking is experimental scheme
- which generalize ip_conntrack to support other layer 3 protocols.
-
- This is required to do Masquerading or other kinds of Network
- Address Translation (except for Fast NAT). It can also be used to
- enhance packet filtering (see `Connection state match support'
- below).
-
-config IP_NF_CONNTRACK_SUPPORT
- bool "Layer 3 Dependent Connection tracking (OBSOLETE)"
- help
- The old, Layer 3 dependent ip_conntrack subsystem of netfilter.
-
- This is required to do Masquerading or other kinds of Network
- Address Translation (except for Fast NAT). It can also be used to
- enhance packet filtering (see `Connection state match support'
- below).
-
-endchoice
-
config NF_CONNTRACK
tristate
- default m if NF_CONNTRACK_SUPPORT && NF_CONNTRACK_ENABLED=m
- default y if NF_CONNTRACK_SUPPORT && NF_CONNTRACK_ENABLED=y
-
-config IP_NF_CONNTRACK
- tristate
- default m if IP_NF_CONNTRACK_SUPPORT && NF_CONNTRACK_ENABLED=m
- default y if IP_NF_CONNTRACK_SUPPORT && NF_CONNTRACK_ENABLED=y
+ default NF_CONNTRACK_ENABLED
config NF_CT_ACCT
bool "Connection tracking flow accounting"
tristate '"CONNMARK" target support'
depends on NETFILTER_XTABLES
depends on IP_NF_MANGLE || IP6_NF_MANGLE
- depends on IP_NF_CONNTRACK || NF_CONNTRACK
- select IP_NF_CONNTRACK_MARK if IP_NF_CONNTRACK
- select NF_CONNTRACK_MARK if NF_CONNTRACK
+ depends on NF_CONNTRACK
+ select NF_CONNTRACK_MARK
help
This option adds a `CONNMARK' target, which allows one to manipulate
the connection mark value. Similar to the MARK target, but
tristate '"NOTRACK" target support'
depends on NETFILTER_XTABLES
depends on IP_NF_RAW || IP6_NF_RAW
- depends on IP_NF_CONNTRACK || NF_CONNTRACK
+ depends on NF_CONNTRACK
help
The NOTRACK target allows a select rule to specify
which packets *not* to enter the conntrack/NAT
config NETFILTER_XT_TARGET_CONNSECMARK
tristate '"CONNSECMARK" target support'
- depends on NETFILTER_XTABLES && \
- ((NF_CONNTRACK && NF_CONNTRACK_SECMARK) || \
- (IP_NF_CONNTRACK && IP_NF_CONNTRACK_SECMARK))
+ depends on NETFILTER_XTABLES && NF_CONNTRACK && NF_CONNTRACK_SECMARK
help
The CONNSECMARK target copies security markings from packets
to connections, and restores security markings from connections
config NETFILTER_XT_MATCH_CONNBYTES
tristate '"connbytes" per-connection counter match support'
depends on NETFILTER_XTABLES
- depends on IP_NF_CONNTRACK || NF_CONNTRACK
- select IP_NF_CT_ACCT if IP_NF_CONNTRACK
- select NF_CT_ACCT if NF_CONNTRACK
+ depends on NF_CONNTRACK
+ select NF_CT_ACCT
help
This option adds a `connbytes' match, which allows you to match the
number of bytes and/or packets for each direction within a connection.
config NETFILTER_XT_MATCH_CONNMARK
tristate '"connmark" connection mark match support'
depends on NETFILTER_XTABLES
- depends on IP_NF_CONNTRACK || NF_CONNTRACK
- select IP_NF_CONNTRACK_MARK if IP_NF_CONNTRACK
- select NF_CONNTRACK_MARK if NF_CONNTRACK
+ depends on NF_CONNTRACK
+ select NF_CONNTRACK_MARK
help
This option adds a `connmark' match, which allows you to match the
connection mark value previously set for the session by `CONNMARK'.
config NETFILTER_XT_MATCH_CONNTRACK
tristate '"conntrack" connection tracking match support'
depends on NETFILTER_XTABLES
- depends on IP_NF_CONNTRACK || NF_CONNTRACK
+ depends on NF_CONNTRACK
help
This is a general conntrack match module, a superset of the state match.
config NETFILTER_XT_MATCH_HELPER
tristate '"helper" match support'
depends on NETFILTER_XTABLES
- depends on IP_NF_CONNTRACK || NF_CONNTRACK
+ depends on NF_CONNTRACK
help
Helper matching allows you to match packets in dynamic connections
tracked by a conntrack-helper, ie. ip_conntrack_ftp
config NETFILTER_XT_MATCH_STATE
tristate '"state" match support'
depends on NETFILTER_XTABLES
- depends on IP_NF_CONNTRACK || NF_CONNTRACK
+ depends on NF_CONNTRACK
help
Connection state matching allows you to match packets based on their
relationship to a tracked connection (ie. previous packets). This
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_CONNMARK.h>
-#include <net/netfilter/nf_conntrack_compat.h>
-#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
#include <net/netfilter/nf_conntrack_ecache.h>
-#endif
static unsigned int
target(struct sk_buff **pskb,
const void *targinfo)
{
const struct xt_connmark_target_info *markinfo = targinfo;
+ struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
u_int32_t diff;
u_int32_t mark;
u_int32_t newmark;
- u_int32_t ctinfo;
- u_int32_t *ctmark = nf_ct_get_mark(*pskb, &ctinfo);
- if (ctmark) {
+ ct = nf_ct_get(*pskb, &ctinfo);
+ if (ct) {
switch(markinfo->mode) {
case XT_CONNMARK_SET:
- newmark = (*ctmark & ~markinfo->mask) | markinfo->mark;
- if (newmark != *ctmark) {
- *ctmark = newmark;
-#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE)
- ip_conntrack_event_cache(IPCT_MARK, *pskb);
-#else
+ newmark = (ct->mark & ~markinfo->mask) | markinfo->mark;
+ if (newmark != ct->mark) {
+ ct->mark = newmark;
nf_conntrack_event_cache(IPCT_MARK, *pskb);
-#endif
}
break;
case XT_CONNMARK_SAVE:
- newmark = (*ctmark & ~markinfo->mask) |
+ newmark = (ct->mark & ~markinfo->mask) |
((*pskb)->mark & markinfo->mask);
- if (*ctmark != newmark) {
- *ctmark = newmark;
-#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE)
- ip_conntrack_event_cache(IPCT_MARK, *pskb);
-#else
+ if (ct->mark != newmark) {
+ ct->mark = newmark;
nf_conntrack_event_cache(IPCT_MARK, *pskb);
-#endif
}
break;
case XT_CONNMARK_RESTORE:
mark = (*pskb)->mark;
- diff = (*ctmark ^ mark) & markinfo->mask;
+ diff = (ct->mark ^ mark) & markinfo->mask;
(*pskb)->mark = mark ^ diff;
break;
}
#include <linux/skbuff.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_CONNSECMARK.h>
-#include <net/netfilter/nf_conntrack_compat.h>
+#include <net/netfilter/nf_conntrack.h>
#define PFX "CONNSECMARK: "
static void secmark_save(struct sk_buff *skb)
{
if (skb->secmark) {
- u32 *connsecmark;
+ struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
- connsecmark = nf_ct_get_secmark(skb, &ctinfo);
- if (connsecmark && !*connsecmark)
- *connsecmark = skb->secmark;
+ ct = nf_ct_get(skb, &ctinfo);
+ if (ct && !ct->secmark)
+ ct->secmark = skb->secmark;
}
}
static void secmark_restore(struct sk_buff *skb)
{
if (!skb->secmark) {
- u32 *connsecmark;
+ struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
- connsecmark = nf_ct_get_secmark(skb, &ctinfo);
- if (connsecmark && *connsecmark)
- skb->secmark = *connsecmark;
+ ct = nf_ct_get(skb, &ctinfo);
+ if (ct && ct->secmark)
+ skb->secmark = ct->secmark;
}
}
#include <linux/skbuff.h>
#include <linux/netfilter/x_tables.h>
-#include <net/netfilter/nf_conntrack_compat.h>
+#include <net/netfilter/nf_conntrack.h>
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_NOTRACK");
If there is a real ct entry correspondig to this packet,
it'll hang aroun till timing out. We don't deal with it
for performance reasons. JK */
- nf_ct_untrack(*pskb);
+ (*pskb)->nfct = &nf_conntrack_untracked.ct_general;
(*pskb)->nfctinfo = IP_CT_NEW;
nf_conntrack_get((*pskb)->nfct);
*/
#include <linux/module.h>
#include <linux/skbuff.h>
-#include <net/netfilter/nf_conntrack_compat.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_connbytes.h>
+#include <net/netfilter/nf_conntrack.h>
#include <asm/div64.h>
#include <asm/bitops.h>
int *hotdrop)
{
const struct xt_connbytes_info *sinfo = matchinfo;
+ struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
u_int64_t what = 0; /* initialize to make gcc happy */
u_int64_t bytes = 0;
u_int64_t pkts = 0;
const struct ip_conntrack_counter *counters;
- if (!(counters = nf_ct_get_counters(skb)))
- return 0; /* no match */
+ ct = nf_ct_get(skb, &ctinfo);
+ if (!ct)
+ return 0;
+ counters = ct->counters;
switch (sinfo->what) {
case XT_CONNBYTES_PKTS:
#include <linux/module.h>
#include <linux/skbuff.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_connmark.h>
MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>");
MODULE_DESCRIPTION("IP tables connmark match module");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_connmark");
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter/xt_connmark.h>
-#include <net/netfilter/nf_conntrack_compat.h>
-
static int
match(const struct sk_buff *skb,
const struct net_device *in,
int *hotdrop)
{
const struct xt_connmark_info *info = matchinfo;
- u_int32_t ctinfo;
- const u_int32_t *ctmark = nf_ct_get_mark(skb, &ctinfo);
- if (!ctmark)
+ struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
+
+ ct = nf_ct_get(skb, &ctinfo);
+ if (!ct)
return 0;
- return (((*ctmark) & info->mask) == info->mark) ^ info->invert;
+ return (((ct->mark) & info->mask) == info->mark) ^ info->invert;
}
static int
#include <linux/module.h>
#include <linux/skbuff.h>
-
-#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE)
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
-#else
-#include <net/netfilter/nf_conntrack.h>
-#endif
-
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_conntrack.h>
-#include <net/netfilter/nf_conntrack_compat.h>
+#include <net/netfilter/nf_conntrack.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
MODULE_DESCRIPTION("iptables connection tracking match module");
MODULE_ALIAS("ipt_conntrack");
-#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE)
-
-static int
-match(const struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- const struct xt_match *match,
- const void *matchinfo,
- int offset,
- unsigned int protoff,
- int *hotdrop)
-{
- const struct xt_conntrack_info *sinfo = matchinfo;
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
- unsigned int statebit;
-
- ct = ip_conntrack_get((struct sk_buff *)skb, &ctinfo);
-
-#define FWINV(bool, invflg) ((bool) ^ !!(sinfo->invflags & invflg))
-
- if (ct == &ip_conntrack_untracked)
- statebit = XT_CONNTRACK_STATE_UNTRACKED;
- else if (ct)
- statebit = XT_CONNTRACK_STATE_BIT(ctinfo);
- else
- statebit = XT_CONNTRACK_STATE_INVALID;
-
- if (sinfo->flags & XT_CONNTRACK_STATE) {
- if (ct) {
- if (test_bit(IPS_SRC_NAT_BIT, &ct->status))
- statebit |= XT_CONNTRACK_STATE_SNAT;
- if (test_bit(IPS_DST_NAT_BIT, &ct->status))
- statebit |= XT_CONNTRACK_STATE_DNAT;
- }
- if (FWINV((statebit & sinfo->statemask) == 0,
- XT_CONNTRACK_STATE))
- return 0;
- }
-
- if (ct == NULL) {
- if (sinfo->flags & ~XT_CONNTRACK_STATE)
- return 0;
- return 1;
- }
-
- if (sinfo->flags & XT_CONNTRACK_PROTO &&
- FWINV(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum !=
- sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum,
- XT_CONNTRACK_PROTO))
- return 0;
-
- if (sinfo->flags & XT_CONNTRACK_ORIGSRC &&
- FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip &
- sinfo->sipmsk[IP_CT_DIR_ORIGINAL].s_addr) !=
- sinfo->tuple[IP_CT_DIR_ORIGINAL].src.ip,
- XT_CONNTRACK_ORIGSRC))
- return 0;
-
- if (sinfo->flags & XT_CONNTRACK_ORIGDST &&
- FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip &
- sinfo->dipmsk[IP_CT_DIR_ORIGINAL].s_addr) !=
- sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.ip,
- XT_CONNTRACK_ORIGDST))
- return 0;
-
- if (sinfo->flags & XT_CONNTRACK_REPLSRC &&
- FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip &
- sinfo->sipmsk[IP_CT_DIR_REPLY].s_addr) !=
- sinfo->tuple[IP_CT_DIR_REPLY].src.ip,
- XT_CONNTRACK_REPLSRC))
- return 0;
-
- if (sinfo->flags & XT_CONNTRACK_REPLDST &&
- FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip &
- sinfo->dipmsk[IP_CT_DIR_REPLY].s_addr) !=
- sinfo->tuple[IP_CT_DIR_REPLY].dst.ip,
- XT_CONNTRACK_REPLDST))
- return 0;
-
- if (sinfo->flags & XT_CONNTRACK_STATUS &&
- FWINV((ct->status & sinfo->statusmask) == 0,
- XT_CONNTRACK_STATUS))
- return 0;
-
- if (sinfo->flags & XT_CONNTRACK_EXPIRES) {
- unsigned long expires = timer_pending(&ct->timeout) ?
- (ct->timeout.expires - jiffies)/HZ : 0;
-
- if (FWINV(!(expires >= sinfo->expires_min &&
- expires <= sinfo->expires_max),
- XT_CONNTRACK_EXPIRES))
- return 0;
- }
- return 1;
-}
-
-#else /* CONFIG_IP_NF_CONNTRACK */
static int
match(const struct sk_buff *skb,
const struct net_device *in,
return 1;
}
-#endif /* CONFIG_NF_IP_CONNTRACK */
-
static int
checkentry(const char *tablename,
const void *ip,
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netfilter.h>
-#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE)
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_conntrack_core.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#else
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_helper.h>
-#endif
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_helper.h>
-#include <net/netfilter/nf_conntrack_compat.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Martin Josefsson <gandalf@netfilter.org>");
#define DEBUGP(format, args...)
#endif
-#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE)
-static int
-match(const struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- const struct xt_match *match,
- const void *matchinfo,
- int offset,
- unsigned int protoff,
- int *hotdrop)
-{
- const struct xt_helper_info *info = matchinfo;
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
- int ret = info->invert;
-
- ct = ip_conntrack_get((struct sk_buff *)skb, &ctinfo);
- if (!ct) {
- DEBUGP("xt_helper: Eek! invalid conntrack?\n");
- return ret;
- }
-
- if (!ct->master) {
- DEBUGP("xt_helper: conntrack %p has no master\n", ct);
- return ret;
- }
-
- read_lock_bh(&ip_conntrack_lock);
- if (!ct->master->helper) {
- DEBUGP("xt_helper: master ct %p has no helper\n",
- exp->expectant);
- goto out_unlock;
- }
-
- DEBUGP("master's name = %s , info->name = %s\n",
- ct->master->helper->name, info->name);
-
- if (info->name[0] == '\0')
- ret ^= 1;
- else
- ret ^= !strncmp(ct->master->helper->name, info->name,
- strlen(ct->master->helper->name));
-out_unlock:
- read_unlock_bh(&ip_conntrack_lock);
- return ret;
-}
-
-#else /* CONFIG_IP_NF_CONNTRACK */
-
static int
match(const struct sk_buff *skb,
const struct net_device *in,
read_unlock_bh(&nf_conntrack_lock);
return ret;
}
-#endif
static int check(const char *tablename,
const void *inf,
#include <linux/module.h>
#include <linux/skbuff.h>
-#include <net/netfilter/nf_conntrack_compat.h>
+#include <net/netfilter/nf_conntrack.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_state.h>
if (nf_ct_is_untracked(skb))
statebit = XT_STATE_UNTRACKED;
- else if (!nf_ct_get_ctinfo(skb, &ctinfo))
+ else if (!nf_ct_get(skb, &ctinfo))
statebit = XT_STATE_INVALID;
else
statebit = XT_STATE_BIT(ctinfo);
projects / openwrt / staging / blogic.git / commitdiff