$(eval $(call nf_add,IPT_NATHELPER_EXTRA,CONFIG_IP_NF_NAT_PPTP, $(P_V4)ip_nat_pptp))
$(eval $(call nf_add,IPT_NATHELPER_EXTRA,CONFIG_NF_CONNTRACK_PPTP, $(P_XT)nf_conntrack_pptp))
$(eval $(call nf_add,IPT_NATHELPER_EXTRA,CONFIG_NF_NAT_PPTP, $(P_V4)nf_nat_pptp))
-$(eval $(call nf_add,IPT_NATHELPER_EXTRA,CONFIG_IP_NF_RTSP, $(P_V4)ip_conntrack_rtsp))
-$(eval $(call nf_add,IPT_NATHELPER_EXTRA,CONFIG_IP_NF_NAT_RTSP, $(P_V4)ip_nat_rtsp))
-$(eval $(call nf_add,IPT_NATHELPER_EXTRA,CONFIG_NF_CONNTRACK_RTSP, $(P_XT)nf_conntrack_rtsp))
-$(eval $(call nf_add,IPT_NATHELPER_EXTRA,CONFIG_NF_NAT_RTSP, $(P_V4)nf_nat_rtsp))
$(eval $(call nf_add,IPT_NATHELPER_EXTRA,CONFIG_IP_NF_SIP, $(P_V4)ip_conntrack_sip))
$(eval $(call nf_add,IPT_NATHELPER_EXTRA,CONFIG_IP_NF_NAT_SIP, $(P_V4)ip_nat_sip))
$(eval $(call nf_add,IPT_NATHELPER_EXTRA,CONFIG_NF_CONNTRACK_SIP, $(P_XT)nf_conntrack_sip))
- mms
- pptp (2.6)
- proto_gre (2.6)
- - rtsp
- sip (2.6)
- snmp_basic
endef
+++ /dev/null
---- a/net/ipv4/netfilter/Config.in
-+++ b/net/ipv4/netfilter/Config.in
-@@ -14,6 +14,7 @@ if [ "$CONFIG_IP_NF_CONNTRACK" != "n" ];
- dep_tristate ' Connection tracking flow accounting' CONFIG_IP_NF_CT_ACCT $CONFIG_IP_NF_CONNTRACK
- dep_tristate ' Connection byte counter support' CONFIG_IP_NF_MATCH_CONNBYTES $CONFIG_IP_NF_CT_ACCT $CONFIG_IP_NF_CONNTRACK $CONFIG_IP_NF_IPTABLES
- dep_tristate ' H.323 (netmeeting) support' CONFIG_IP_NF_H323 $CONFIG_IP_NF_CONNTRACK
-+ dep_tristate ' RTSP protocol support' CONFIG_IP_NF_RTSP $CONFIG_IP_NF_CONNTRACK
- fi
-
- if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
-@@ -88,6 +89,13 @@ if [ "$CONFIG_IP_NF_IPTABLES" != "n" ];
- define_tristate CONFIG_IP_NF_NAT_H323 $CONFIG_IP_NF_NAT
- fi
- fi
-+ if [ "$CONFIG_IP_NF_RTSP" = "m" ]; then
-+ define_tristate CONFIG_IP_NF_NAT_RTSP m
-+ else
-+ if [ "$CONFIG_IP_NF_RTSP" = "y" ]; then
-+ define_tristate CONFIG_IP_NF_NAT_RTSP $CONFIG_IP_NF_NAT
-+ fi
-+ fi
- if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
- dep_tristate ' Basic SNMP-ALG support (EXPERIMENTAL)' CONFIG_IP_NF_NAT_SNMP_BASIC $CONFIG_IP_NF_NAT
- fi
---- a/net/ipv4/netfilter/Makefile
-+++ b/net/ipv4/netfilter/Makefile
-@@ -51,6 +51,11 @@ obj-$(CONFIG_IP_NF_H323) += ip_conntrack
- ifdef CONFIG_IP_NF_NAT_H323
- export-objs += ip_conntrack_h323.o
- endif
-+obj-$(CONFIG_IP_NF_RTSP) += ip_conntrack_rtsp.o
-+ifdef CONFIG_IP_NF_NAT_RTSP
-+ export-objs += ip_conntrack_rtsp.o
-+endif
-+
-
- # NAT helpers
- obj-$(CONFIG_IP_NF_NAT_AMANDA) += ip_nat_amanda.o
-@@ -58,6 +63,7 @@ obj-$(CONFIG_IP_NF_NAT_TFTP) += ip_nat_t
- obj-$(CONFIG_IP_NF_NAT_FTP) += ip_nat_ftp.o
- obj-$(CONFIG_IP_NF_NAT_IRC) += ip_nat_irc.o
- obj-$(CONFIG_IP_NF_NAT_H323) += ip_nat_h323.o
-+obj-$(CONFIG_IP_NF_NAT_RTSP) += ip_nat_rtsp.o
-
- # generic IP tables
- obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
---- /dev/null
-+++ b/net/ipv4/netfilter/ip_conntrack_rtsp.c
-@@ -0,0 +1,507 @@
-+/*
-+ * RTSP extension for IP connection tracking
-+ * (C) 2003 by Tom Marshall <tmarshall@real.com>
-+ * based on ip_conntrack_irc.c
-+ *
-+ * 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_rtsp.o ports=port1,port2,...port<MAX_PORTS>
-+ * max_outstanding=n setup_timeout=secs
-+ *
-+ * If no ports are specified, the default will be port 554.
-+ *
-+ * With max_outstanding you can define the maximum number of not yet
-+ * answered SETUP requests per RTSP session (default 8).
-+ * With setup_timeout you can specify how long the system waits for
-+ * an expected data channel (default 300 seconds).
-+ */
-+
-+#include <linux/config.h>
-+#include <linux/module.h>
-+#include <linux/netfilter.h>
-+#include <linux/ip.h>
-+#include <net/checksum.h>
-+#include <net/tcp.h>
-+
-+#include <linux/netfilter_ipv4/lockhelp.h>
-+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-+#include <linux/netfilter_ipv4/ip_conntrack_rtsp.h>
-+
-+#include <linux/ctype.h>
-+#define NF_NEED_STRNCASECMP
-+#define NF_NEED_STRTOU16
-+#define NF_NEED_STRTOU32
-+#define NF_NEED_NEXTLINE
-+#include <linux/netfilter_helpers.h>
-+#define NF_NEED_MIME_NEXTLINE
-+#include <linux/netfilter_mime.h>
-+
-+#define MAX_SIMUL_SETUP 8 /* XXX: use max_outstanding */
-+
-+#define INFOP(fmt, args...) printk(KERN_INFO "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#ifdef IP_NF_RTSP_DEBUG
-+#define DEBUGP(fmt, args...) printk(KERN_DEBUG "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#else
-+#define DEBUGP(fmt, args...)
-+#endif
-+
-+#define MAX_PORTS 8
-+static int ports[MAX_PORTS];
-+static int num_ports = 0;
-+static int max_outstanding = 8;
-+static unsigned int setup_timeout = 300;
-+
-+MODULE_AUTHOR("Tom Marshall <tmarshall@real.com>");
-+MODULE_DESCRIPTION("RTSP connection tracking module");
-+MODULE_LICENSE("GPL");
-+#ifdef MODULE_PARM
-+MODULE_PARM(ports, "1-" __MODULE_STRING(MAX_PORTS) "i");
-+MODULE_PARM_DESC(ports, "port numbers of RTSP servers");
-+MODULE_PARM(max_outstanding, "i");
-+MODULE_PARM_DESC(max_outstanding, "max number of outstanding SETUP requests per RTSP session");
-+MODULE_PARM(setup_timeout, "i");
-+MODULE_PARM_DESC(setup_timeout, "timeout on for unestablished data channels");
-+#endif
-+
-+DECLARE_LOCK(ip_rtsp_lock);
-+struct module* ip_conntrack_rtsp = THIS_MODULE;
-+
-+/*
-+ * Max mappings we will allow for one RTSP connection (for RTP, the number
-+ * of allocated ports is twice this value). Note that SMIL burns a lot of
-+ * ports so keep this reasonably high. If this is too low, you will see a
-+ * lot of "no free client map entries" messages.
-+ */
-+#define MAX_PORT_MAPS 16
-+
-+/*** default port list was here in the masq code: 554, 3030, 4040 ***/
-+
-+#define SKIP_WSPACE(ptr,len,off) while(off < len && isspace(*(ptr+off))) { off++; }
-+
-+/*
-+ * Parse an RTSP packet.
-+ *
-+ * Returns zero if parsing failed.
-+ *
-+ * Parameters:
-+ * IN ptcp tcp data pointer
-+ * IN tcplen tcp data len
-+ * IN/OUT ptcpoff points to current tcp offset
-+ * OUT phdrsoff set to offset of rtsp headers
-+ * OUT phdrslen set to length of rtsp headers
-+ * OUT pcseqoff set to offset of CSeq header
-+ * OUT pcseqlen set to length of CSeq header
-+ */
-+static int
-+rtsp_parse_message(char* ptcp, uint tcplen, uint* ptcpoff,
-+ uint* phdrsoff, uint* phdrslen,
-+ uint* pcseqoff, uint* pcseqlen)
-+{
-+ uint entitylen = 0;
-+ uint lineoff;
-+ uint linelen;
-+
-+ if (!nf_nextline(ptcp, tcplen, ptcpoff, &lineoff, &linelen))
-+ {
-+ return 0;
-+ }
-+
-+ *phdrsoff = *ptcpoff;
-+ while (nf_mime_nextline(ptcp, tcplen, ptcpoff, &lineoff, &linelen))
-+ {
-+ if (linelen == 0)
-+ {
-+ if (entitylen > 0)
-+ {
-+ *ptcpoff += min(entitylen, tcplen - *ptcpoff);
-+ }
-+ break;
-+ }
-+ if (lineoff+linelen > tcplen)
-+ {
-+ INFOP("!! overrun !!\n");
-+ break;
-+ }
-+
-+ if (nf_strncasecmp(ptcp+lineoff, "CSeq:", 5) == 0)
-+ {
-+ *pcseqoff = lineoff;
-+ *pcseqlen = linelen;
-+ }
-+ if (nf_strncasecmp(ptcp+lineoff, "Content-Length:", 15) == 0)
-+ {
-+ uint off = lineoff+15;
-+ SKIP_WSPACE(ptcp+lineoff, linelen, off);
-+ nf_strtou32(ptcp+off, &entitylen);
-+ }
-+ }
-+ *phdrslen = (*ptcpoff) - (*phdrsoff);
-+
-+ return 1;
-+}
-+
-+/*
-+ * Find lo/hi client ports (if any) in transport header
-+ * In:
-+ * ptcp, tcplen = packet
-+ * tranoff, tranlen = buffer to search
-+ *
-+ * Out:
-+ * pport_lo, pport_hi = lo/hi ports (host endian)
-+ *
-+ * Returns nonzero if any client ports found
-+ *
-+ * Note: it is valid (and expected) for the client to request multiple
-+ * transports, so we need to parse the entire line.
-+ */
-+static int
-+rtsp_parse_transport(char* ptran, uint tranlen,
-+ struct ip_ct_rtsp_expect* prtspexp)
-+{
-+ int rc = 0;
-+ uint off = 0;
-+
-+ if (tranlen < 10 || !iseol(ptran[tranlen-1]) ||
-+ nf_strncasecmp(ptran, "Transport:", 10) != 0)
-+ {
-+ INFOP("sanity check failed\n");
-+ return 0;
-+ }
-+ DEBUGP("tran='%.*s'\n", (int)tranlen, ptran);
-+ off += 10;
-+ SKIP_WSPACE(ptran, tranlen, off);
-+
-+ /* Transport: tran;field;field=val,tran;field;field=val,... */
-+ while (off < tranlen)
-+ {
-+ const char* pparamend;
-+ uint nextparamoff;
-+
-+ pparamend = memchr(ptran+off, ',', tranlen-off);
-+ pparamend = (pparamend == NULL) ? ptran+tranlen : pparamend+1;
-+ nextparamoff = pparamend-ptran;
-+
-+ while (off < nextparamoff)
-+ {
-+ const char* pfieldend;
-+ uint nextfieldoff;
-+
-+ pfieldend = memchr(ptran+off, ';', nextparamoff-off);
-+ nextfieldoff = (pfieldend == NULL) ? nextparamoff : pfieldend-ptran+1;
-+
-+ if (strncmp(ptran+off, "client_port=", 12) == 0)
-+ {
-+ u_int16_t port;
-+ uint numlen;
-+
-+ off += 12;
-+ numlen = nf_strtou16(ptran+off, &port);
-+ off += numlen;
-+ if (prtspexp->loport != 0 && prtspexp->loport != port)
-+ {
-+ DEBUGP("multiple ports found, port %hu ignored\n", port);
-+ }
-+ else
-+ {
-+ prtspexp->loport = prtspexp->hiport = port;
-+ if (ptran[off] == '-')
-+ {
-+ off++;
-+ numlen = nf_strtou16(ptran+off, &port);
-+ off += numlen;
-+ prtspexp->pbtype = pb_range;
-+ prtspexp->hiport = port;
-+
-+ // If we have a range, assume rtp:
-+ // loport must be even, hiport must be loport+1
-+ if ((prtspexp->loport & 0x0001) != 0 ||
-+ prtspexp->hiport != prtspexp->loport+1)
-+ {
-+ DEBUGP("incorrect range: %hu-%hu, correcting\n",
-+ prtspexp->loport, prtspexp->hiport);
-+ prtspexp->loport &= 0xfffe;
-+ prtspexp->hiport = prtspexp->loport+1;
-+ }
-+ }
-+ else if (ptran[off] == '/')
-+ {
-+ off++;
-+ numlen = nf_strtou16(ptran+off, &port);
-+ off += numlen;
-+ prtspexp->pbtype = pb_discon;
-+ prtspexp->hiport = port;
-+ }
-+ rc = 1;
-+ }
-+ }
-+
-+ /*
-+ * Note we don't look for the destination parameter here.
-+ * If we are using NAT, the NAT module will handle it. If not,
-+ * and the client is sending packets elsewhere, the expectation
-+ * will quietly time out.
-+ */
-+
-+ off = nextfieldoff;
-+ }
-+
-+ off = nextparamoff;
-+ }
-+
-+ return rc;
-+}
-+
-+/*** conntrack functions ***/
-+
-+/* outbound packet: client->server */
-+static int
-+help_out(const struct iphdr* iph, size_t pktlen,
-+ struct ip_conntrack* ct, enum ip_conntrack_info ctinfo)
-+{
-+ int dir = CTINFO2DIR(ctinfo); /* = IP_CT_DIR_ORIGINAL */
-+ struct tcphdr* tcph = (void*)iph + iph->ihl * 4;
-+ uint tcplen = pktlen - iph->ihl * 4;
-+ char* pdata = (char*)tcph + tcph->doff * 4;
-+ uint datalen = tcplen - tcph->doff * 4;
-+ uint dataoff = 0;
-+
-+ struct ip_conntrack_expect exp;
-+
-+ while (dataoff < datalen)
-+ {
-+ uint cmdoff = dataoff;
-+ uint hdrsoff = 0;
-+ uint hdrslen = 0;
-+ uint cseqoff = 0;
-+ uint cseqlen = 0;
-+ uint lineoff = 0;
-+ uint linelen = 0;
-+ uint off;
-+ int rc;
-+
-+ if (!rtsp_parse_message(pdata, datalen, &dataoff,
-+ &hdrsoff, &hdrslen,
-+ &cseqoff, &cseqlen))
-+ {
-+ break; /* not a valid message */
-+ }
-+
-+ if (strncmp(pdata+cmdoff, "SETUP ", 6) != 0)
-+ {
-+ continue; /* not a SETUP message */
-+ }
-+ DEBUGP("found a setup message\n");
-+
-+ memset(&exp, 0, sizeof(exp));
-+
-+ off = 0;
-+ while (nf_mime_nextline(pdata+hdrsoff, hdrslen, &off,
-+ &lineoff, &linelen))
-+ {
-+ if (linelen == 0)
-+ {
-+ break;
-+ }
-+ if (off > hdrsoff+hdrslen)
-+ {
-+ INFOP("!! overrun !!");
-+ break;
-+ }
-+
-+ if (nf_strncasecmp(pdata+hdrsoff+lineoff, "Transport:", 10) == 0)
-+ {
-+ rtsp_parse_transport(pdata+hdrsoff+lineoff, linelen,
-+ &exp.help.exp_rtsp_info);
-+ }
-+ }
-+
-+ if (exp.help.exp_rtsp_info.loport == 0)
-+ {
-+ DEBUGP("no udp transports found\n");
-+ continue; /* no udp transports found */
-+ }
-+
-+ DEBUGP("udp transport found, ports=(%d,%hu,%hu)\n",
-+ (int)exp.help.exp_rtsp_info.pbtype,
-+ exp.help.exp_rtsp_info.loport,
-+ exp.help.exp_rtsp_info.hiport);
-+
-+ LOCK_BH(&ip_rtsp_lock);
-+ exp.seq = ntohl(tcph->seq) + hdrsoff; /* mark all the headers */
-+ exp.help.exp_rtsp_info.len = hdrslen;
-+
-+ exp.tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
-+ exp.mask.src.ip = 0xffffffff;
-+ exp.tuple.dst.ip = ct->tuplehash[dir].tuple.src.ip;
-+ exp.mask.dst.ip = 0xffffffff;
-+ exp.tuple.dst.u.udp.port = exp.help.exp_rtsp_info.loport;
-+ exp.mask.dst.u.udp.port = (exp.help.exp_rtsp_info.pbtype == pb_range) ? 0xfffe : 0xffff;
-+ exp.tuple.dst.protonum = IPPROTO_UDP;
-+ exp.mask.dst.protonum = 0xffff;
-+
-+ DEBUGP("expect_related %u.%u.%u.%u:%u-%u.%u.%u.%u:%u\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));
-+
-+ /* pass the request off to the nat helper */
-+ rc = ip_conntrack_expect_related(ct, &exp);
-+ UNLOCK_BH(&ip_rtsp_lock);
-+ if (rc == 0)
-+ {
-+ DEBUGP("ip_conntrack_expect_related succeeded\n");
-+ }
-+ else
-+ {
-+ INFOP("ip_conntrack_expect_related failed (%d)\n", rc);
-+ }
-+ }
-+
-+ return NF_ACCEPT;
-+}
-+
-+/* inbound packet: server->client */
-+static int
-+help_in(const struct iphdr* iph, size_t pktlen,
-+ struct ip_conntrack* ct, enum ip_conntrack_info ctinfo)
-+{
-+ return NF_ACCEPT;
-+}
-+
-+static int
-+help(const struct iphdr* iph, size_t pktlen,
-+ struct ip_conntrack* ct, enum ip_conntrack_info ctinfo)
-+{
-+ /* tcplen not negative guarenteed by ip_conntrack_tcp.c */
-+ struct tcphdr* tcph = (void*)iph + iph->ihl * 4;
-+ u_int32_t tcplen = pktlen - iph->ihl * 4;
-+
-+ /* 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 whole TCP header? */
-+ if (tcplen < sizeof(struct tcphdr) || tcplen < tcph->doff * 4)
-+ {
-+ DEBUGP("tcplen = %u\n", (unsigned)tcplen);
-+ return NF_ACCEPT;
-+ }
-+
-+ /* Checksum invalid? Ignore. */
-+ /* FIXME: Source route IP option packets --RR */
-+ if (tcp_v4_check(tcph, tcplen, iph->saddr, iph->daddr,
-+ csum_partial((char*)tcph, tcplen, 0)))
-+ {
-+ DEBUGP("bad csum: %p %u %u.%u.%u.%u %u.%u.%u.%u\n",
-+ tcph, tcplen, NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
-+ return NF_ACCEPT;
-+ }
-+
-+ switch (CTINFO2DIR(ctinfo))
-+ {
-+ case IP_CT_DIR_ORIGINAL:
-+ help_out(iph, pktlen, ct, ctinfo);
-+ break;
-+ case IP_CT_DIR_REPLY:
-+ help_in(iph, pktlen, ct, ctinfo);
-+ break;
-+ }
-+
-+ return NF_ACCEPT;
-+}
-+
-+static struct ip_conntrack_helper rtsp_helpers[MAX_PORTS];
-+static char rtsp_names[MAX_PORTS][10];
-+
-+/* This function is intentionally _NOT_ defined as __exit */
-+static void
-+fini(void)
-+{
-+ int i;
-+ for (i = 0; i < num_ports; i++)
-+ {
-+ DEBUGP("unregistering port %d\n", ports[i]);
-+ ip_conntrack_helper_unregister(&rtsp_helpers[i]);
-+ }
-+}
-+
-+static int __init
-+init(void)
-+{
-+ int i, ret;
-+ struct ip_conntrack_helper *hlpr;
-+ char *tmpname;
-+
-+ printk("ip_conntrack_rtsp v" IP_NF_RTSP_VERSION " loading\n");
-+
-+ if (max_outstanding < 1)
-+ {
-+ printk("ip_conntrack_rtsp: max_outstanding must be a positive integer\n");
-+ return -EBUSY;
-+ }
-+ if (setup_timeout < 0)
-+ {
-+ printk("ip_conntrack_rtsp: setup_timeout must be a positive integer\n");
-+ return -EBUSY;
-+ }
-+
-+ /* If no port given, default to standard rtsp port */
-+ if (ports[0] == 0)
-+ {
-+ ports[0] = RTSP_PORT;
-+ }
-+
-+ for (i = 0; (i < MAX_PORTS) && ports[i]; i++)
-+ {
-+ hlpr = &rtsp_helpers[i];
-+ memset(hlpr, 0, sizeof(struct ip_conntrack_helper));
-+ hlpr->tuple.src.u.tcp.port = htons(ports[i]);
-+ hlpr->tuple.dst.protonum = IPPROTO_TCP;
-+ hlpr->mask.src.u.tcp.port = 0xFFFF;
-+ hlpr->mask.dst.protonum = 0xFFFF;
-+ hlpr->max_expected = max_outstanding;
-+ hlpr->timeout = setup_timeout;
-+ hlpr->flags = IP_CT_HELPER_F_REUSE_EXPECT;
-+ hlpr->me = ip_conntrack_rtsp;
-+ hlpr->help = help;
-+
-+ tmpname = &rtsp_names[i][0];
-+ if (ports[i] == RTSP_PORT)
-+ {
-+ sprintf(tmpname, "rtsp");
-+ }
-+ else
-+ {
-+ sprintf(tmpname, "rtsp-%d", i);
-+ }
-+ hlpr->name = tmpname;
-+
-+ DEBUGP("port #%d: %d\n", i, ports[i]);
-+
-+ ret = ip_conntrack_helper_register(hlpr);
-+
-+ if (ret)
-+ {
-+ printk("ip_conntrack_rtsp: ERROR registering port %d\n", ports[i]);
-+ fini();
-+ return -EBUSY;
-+ }
-+ num_ports++;
-+ }
-+ return 0;
-+}
-+
-+#ifdef CONFIG_IP_NF_NAT_NEEDED
-+EXPORT_SYMBOL(ip_rtsp_lock);
-+#endif
-+
-+module_init(init);
-+module_exit(fini);
---- /dev/null
-+++ b/net/ipv4/netfilter/ip_nat_rtsp.c
-@@ -0,0 +1,621 @@
-+/*
-+ * RTSP extension for TCP NAT alteration
-+ * (C) 2003 by Tom Marshall <tmarshall@real.com>
-+ * based on ip_nat_irc.c
-+ *
-+ * 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_rtsp.o ports=port1,port2,...port<MAX_PORTS>
-+ * stunaddr=<address>
-+ * destaction=[auto|strip|none]
-+ *
-+ * If no ports are specified, the default will be port 554 only.
-+ *
-+ * stunaddr specifies the address used to detect that a client is using STUN.
-+ * If this address is seen in the destination parameter, it is assumed that
-+ * the client has already punched a UDP hole in the firewall, so we don't
-+ * mangle the client_port. If none is specified, it is autodetected. It
-+ * only needs to be set if you have multiple levels of NAT. It should be
-+ * set to the external address that the STUN clients detect. Note that in
-+ * this case, it will not be possible for clients to use UDP with servers
-+ * between the NATs.
-+ *
-+ * If no destaction is specified, auto is used.
-+ * destaction=auto: strip destination parameter if it is not stunaddr.
-+ * destaction=strip: always strip destination parameter (not recommended).
-+ * destaction=none: do not touch destination parameter (not recommended).
-+ */
-+
-+#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_rtsp.h>
-+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-+
-+#include <linux/inet.h>
-+#include <linux/ctype.h>
-+#define NF_NEED_STRNCASECMP
-+#define NF_NEED_STRTOU16
-+#include <linux/netfilter_helpers.h>
-+#define NF_NEED_MIME_NEXTLINE
-+#include <linux/netfilter_mime.h>
-+
-+#define INFOP(fmt, args...) printk(KERN_INFO "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#ifdef IP_NF_RTSP_DEBUG
-+#define DEBUGP(fmt, args...) printk(KERN_DEBUG "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#else
-+#define DEBUGP(fmt, args...)
-+#endif
-+
-+#define MAX_PORTS 8
-+#define DSTACT_AUTO 0
-+#define DSTACT_STRIP 1
-+#define DSTACT_NONE 2
-+
-+static int ports[MAX_PORTS];
-+static char* stunaddr = NULL;
-+static char* destaction = NULL;
-+
-+static int num_ports = 0;
-+static u_int32_t extip = 0;
-+static int dstact = 0;
-+
-+MODULE_AUTHOR("Tom Marshall <tmarshall@real.com>");
-+MODULE_DESCRIPTION("RTSP network address translation module");
-+MODULE_LICENSE("GPL");
-+#ifdef MODULE_PARM
-+MODULE_PARM(ports, "1-" __MODULE_STRING(MAX_PORTS) "i");
-+MODULE_PARM_DESC(ports, "port numbers of RTSP servers");
-+MODULE_PARM(stunaddr, "s");
-+MODULE_PARM_DESC(stunaddr, "Address for detecting STUN");
-+MODULE_PARM(destaction, "s");
-+MODULE_PARM_DESC(destaction, "Action for destination parameter (auto/strip/none)");
-+#endif
-+
-+/* protects rtsp part of conntracks */
-+DECLARE_LOCK_EXTERN(ip_rtsp_lock);
-+
-+#define SKIP_WSPACE(ptr,len,off) while(off < len && isspace(*(ptr+off))) { off++; }
-+
-+/*** helper functions ***/
-+
-+static void
-+get_skb_tcpdata(struct sk_buff* skb, char** pptcpdata, uint* ptcpdatalen)
-+{
-+ struct iphdr* iph = (struct iphdr*)skb->nh.iph;
-+ struct tcphdr* tcph = (struct tcphdr*)((char*)iph + iph->ihl*4);
-+
-+ *pptcpdata = (char*)tcph + tcph->doff*4;
-+ *ptcpdatalen = ((char*)skb->h.raw + skb->len) - *pptcpdata;
-+}
-+
-+/*** nat functions ***/
-+
-+/*
-+ * Mangle the "Transport:" header:
-+ * - Replace all occurences of "client_port=<spec>"
-+ * - Handle destination parameter
-+ *
-+ * In:
-+ * ct, ctinfo = conntrack context
-+ * pskb = packet
-+ * tranoff = Transport header offset from TCP data
-+ * tranlen = Transport header length (incl. CRLF)
-+ * rport_lo = replacement low port (host endian)
-+ * rport_hi = replacement high port (host endian)
-+ *
-+ * Returns packet size difference.
-+ *
-+ * Assumes that a complete transport header is present, ending with CR or LF
-+ */
-+static int
-+rtsp_mangle_tran(struct ip_conntrack* ct, enum ip_conntrack_info ctinfo,
-+ struct ip_conntrack_expect* exp,
-+ struct sk_buff** pskb, uint tranoff, uint tranlen)
-+{
-+ char* ptcp;
-+ uint tcplen;
-+ char* ptran;
-+ char rbuf1[16]; /* Replacement buffer (one port) */
-+ uint rbuf1len; /* Replacement len (one port) */
-+ char rbufa[16]; /* Replacement buffer (all ports) */
-+ uint rbufalen; /* Replacement len (all ports) */
-+ u_int32_t newip;
-+ u_int16_t loport, hiport;
-+ uint off = 0;
-+ uint diff; /* Number of bytes we removed */
-+
-+ struct ip_ct_rtsp_expect* prtspexp = &exp->help.exp_rtsp_info;
-+ struct ip_conntrack_tuple t;
-+
-+ char szextaddr[15+1];
-+ uint extaddrlen;
-+ int is_stun;
-+
-+ get_skb_tcpdata(*pskb, &ptcp, &tcplen);
-+ ptran = ptcp+tranoff;
-+
-+ if (tranoff+tranlen > tcplen || tcplen-tranoff < tranlen ||
-+ tranlen < 10 || !iseol(ptran[tranlen-1]) ||
-+ nf_strncasecmp(ptran, "Transport:", 10) != 0)
-+ {
-+ INFOP("sanity check failed\n");
-+ return 0;
-+ }
-+ off += 10;
-+ SKIP_WSPACE(ptcp+tranoff, tranlen, off);
-+
-+ newip = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip;
-+ t = exp->tuple;
-+ t.dst.ip = newip;
-+
-+ extaddrlen = extip ? sprintf(szextaddr, "%u.%u.%u.%u", NIPQUAD(extip))
-+ : sprintf(szextaddr, "%u.%u.%u.%u", NIPQUAD(newip));
-+ DEBUGP("stunaddr=%s (%s)\n", szextaddr, (extip?"forced":"auto"));
-+
-+ rbuf1len = rbufalen = 0;
-+ switch (prtspexp->pbtype)
-+ {
-+ case pb_single:
-+ for (loport = prtspexp->loport; loport != 0; loport++) /* XXX: improper wrap? */
-+ {
-+ t.dst.u.udp.port = htons(loport);
-+ if (ip_conntrack_change_expect(exp, &t) == 0)
-+ {
-+ DEBUGP("using port %hu\n", loport);
-+ break;
-+ }
-+ }
-+ if (loport != 0)
-+ {
-+ rbuf1len = sprintf(rbuf1, "%hu", loport);
-+ rbufalen = sprintf(rbufa, "%hu", loport);
-+ }
-+ break;
-+ case pb_range:
-+ for (loport = prtspexp->loport; loport != 0; loport += 2) /* XXX: improper wrap? */
-+ {
-+ t.dst.u.udp.port = htons(loport);
-+ if (ip_conntrack_change_expect(exp, &t) == 0)
-+ {
-+ hiport = loport + ~exp->mask.dst.u.udp.port;
-+ DEBUGP("using ports %hu-%hu\n", loport, hiport);
-+ break;
-+ }
-+ }
-+ if (loport != 0)
-+ {
-+ rbuf1len = sprintf(rbuf1, "%hu", loport);
-+ rbufalen = sprintf(rbufa, "%hu-%hu", loport, loport+1);
-+ }
-+ break;
-+ case pb_discon:
-+ for (loport = prtspexp->loport; loport != 0; loport++) /* XXX: improper wrap? */
-+ {
-+ t.dst.u.udp.port = htons(loport);
-+ if (ip_conntrack_change_expect(exp, &t) == 0)
-+ {
-+ DEBUGP("using port %hu (1 of 2)\n", loport);
-+ break;
-+ }
-+ }
-+ for (hiport = prtspexp->hiport; hiport != 0; hiport++) /* XXX: improper wrap? */
-+ {
-+ t.dst.u.udp.port = htons(hiport);
-+ if (ip_conntrack_change_expect(exp, &t) == 0)
-+ {
-+ DEBUGP("using port %hu (2 of 2)\n", hiport);
-+ break;
-+ }
-+ }
-+ if (loport != 0 && hiport != 0)
-+ {
-+ rbuf1len = sprintf(rbuf1, "%hu", loport);
-+ if (hiport == loport+1)
-+ {
-+ rbufalen = sprintf(rbufa, "%hu-%hu", loport, hiport);
-+ }
-+ else
-+ {
-+ rbufalen = sprintf(rbufa, "%hu/%hu", loport, hiport);
-+ }
-+ }
-+ break;
-+ }
-+
-+ if (rbuf1len == 0)
-+ {
-+ return 0; /* cannot get replacement port(s) */
-+ }
-+
-+ /* Transport: tran;field;field=val,tran;field;field=val,... */
-+ while (off < tranlen)
-+ {
-+ uint saveoff;
-+ const char* pparamend;
-+ uint nextparamoff;
-+
-+ pparamend = memchr(ptran+off, ',', tranlen-off);
-+ pparamend = (pparamend == NULL) ? ptran+tranlen : pparamend+1;
-+ nextparamoff = pparamend-ptcp;
-+
-+ /*
-+ * We pass over each param twice. On the first pass, we look for a
-+ * destination= field. It is handled by the security policy. If it
-+ * is present, allowed, and equal to our external address, we assume
-+ * that STUN is being used and we leave the client_port= field alone.
-+ */
-+ is_stun = 0;
-+ saveoff = off;
-+ while (off < nextparamoff)
-+ {
-+ const char* pfieldend;
-+ uint nextfieldoff;
-+
-+ pfieldend = memchr(ptran+off, ';', nextparamoff-off);
-+ nextfieldoff = (pfieldend == NULL) ? nextparamoff : pfieldend-ptran+1;
-+
-+ if (dstact != DSTACT_NONE && strncmp(ptran+off, "destination=", 12) == 0)
-+ {
-+ if (strncmp(ptran+off+12, szextaddr, extaddrlen) == 0)
-+ {
-+ is_stun = 1;
-+ }
-+ if (dstact == DSTACT_STRIP || (dstact == DSTACT_AUTO && !is_stun))
-+ {
-+ diff = nextfieldoff-off;
-+ if (!ip_nat_mangle_tcp_packet(pskb, ct, ctinfo,
-+ off, diff, NULL, 0))
-+ {
-+ /* mangle failed, all we can do is bail */
-+ return 0;
-+ }
-+ get_skb_tcpdata(*pskb, &ptcp, &tcplen);
-+ ptran = ptcp+tranoff;
-+ tranlen -= diff;
-+ nextparamoff -= diff;
-+ nextfieldoff -= diff;
-+ }
-+ }
-+
-+ off = nextfieldoff;
-+ }
-+ if (is_stun)
-+ {
-+ continue;
-+ }
-+ off = saveoff;
-+ while (off < nextparamoff)
-+ {
-+ const char* pfieldend;
-+ uint nextfieldoff;
-+
-+ pfieldend = memchr(ptran+off, ';', nextparamoff-off);
-+ nextfieldoff = (pfieldend == NULL) ? nextparamoff : pfieldend-ptran+1;
-+
-+ if (strncmp(ptran+off, "client_port=", 12) == 0)
-+ {
-+ u_int16_t port;
-+ uint numlen;
-+ uint origoff;
-+ uint origlen;
-+ char* rbuf = rbuf1;
-+ uint rbuflen = rbuf1len;
-+
-+ off += 12;
-+ origoff = (ptran-ptcp)+off;
-+ origlen = 0;
-+ numlen = nf_strtou16(ptran+off, &port);
-+ off += numlen;
-+ origlen += numlen;
-+ if (port != prtspexp->loport)
-+ {
-+ DEBUGP("multiple ports found, port %hu ignored\n", port);
-+ }
-+ else
-+ {
-+ if (ptran[off] == '-' || ptran[off] == '/')
-+ {
-+ off++;
-+ origlen++;
-+ numlen = nf_strtou16(ptran+off, &port);
-+ off += numlen;
-+ origlen += numlen;
-+ rbuf = rbufa;
-+ rbuflen = rbufalen;
-+ }
-+
-+ /*
-+ * note we cannot just memcpy() if the sizes are the same.
-+ * the mangle function does skb resizing, checks for a
-+ * cloned skb, and updates the checksums.
-+ *
-+ * parameter 4 below is offset from start of tcp data.
-+ */
-+ diff = origlen-rbuflen;
-+ if (!ip_nat_mangle_tcp_packet(pskb, ct, ctinfo,
-+ origoff, origlen, rbuf, rbuflen))
-+ {
-+ /* mangle failed, all we can do is bail */
-+ return 0;
-+ }
-+ get_skb_tcpdata(*pskb, &ptcp, &tcplen);
-+ ptran = ptcp+tranoff;
-+ tranlen -= diff;
-+ nextparamoff -= diff;
-+ nextfieldoff -= diff;
-+ }
-+ }
-+
-+ off = nextfieldoff;
-+ }
-+
-+ off = nextparamoff;
-+ }
-+
-+ return 1;
-+}
-+
-+static unsigned int
-+expected(struct sk_buff **pskb, uint hooknum, struct ip_conntrack* ct, struct ip_nat_info* info)
-+{
-+ struct ip_nat_multi_range mr;
-+ u_int32_t newdstip, newsrcip, newip;
-+
-+ struct ip_conntrack *master = master_ct(ct);
-+
-+ IP_NF_ASSERT(info);
-+ IP_NF_ASSERT(master);
-+
-+ IP_NF_ASSERT(!(info->initialized & (1 << HOOK2MANIP(hooknum))));
-+
-+ newdstip = master->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip;
-+ newsrcip = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip;
-+ newip = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC) ? newsrcip : newdstip;
-+
-+ DEBUGP("newsrcip=%u.%u.%u.%u, newdstip=%u.%u.%u.%u, newip=%u.%u.%u.%u\n",
-+ NIPQUAD(newsrcip), NIPQUAD(newdstip), NIPQUAD(newip));
-+
-+ mr.rangesize = 1;
-+ /* We don't want to manip the per-protocol, just the IPs. */
-+ mr.range[0].flags = IP_NAT_RANGE_MAP_IPS;
-+ mr.range[0].min_ip = mr.range[0].max_ip = newip;
-+
-+ return ip_nat_setup_info(ct, &mr, hooknum);
-+}
-+
-+static uint
-+help_out(struct ip_conntrack* ct, enum ip_conntrack_info ctinfo,
-+ struct ip_conntrack_expect* exp, struct sk_buff** pskb)
-+{
-+ char* ptcp;
-+ uint tcplen;
-+ uint hdrsoff;
-+ uint hdrslen;
-+ uint lineoff;
-+ uint linelen;
-+ uint off;
-+
-+ struct iphdr* iph = (struct iphdr*)(*pskb)->nh.iph;
-+ struct tcphdr* tcph = (struct tcphdr*)((void*)iph + iph->ihl*4);
-+
-+ struct ip_ct_rtsp_expect* prtspexp = &exp->help.exp_rtsp_info;
-+
-+ get_skb_tcpdata(*pskb, &ptcp, &tcplen);
-+
-+ hdrsoff = exp->seq - ntohl(tcph->seq);
-+ hdrslen = prtspexp->len;
-+ off = hdrsoff;
-+
-+ while (nf_mime_nextline(ptcp, hdrsoff+hdrslen, &off, &lineoff, &linelen))
-+ {
-+ if (linelen == 0)
-+ {
-+ break;
-+ }
-+ if (off > hdrsoff+hdrslen)
-+ {
-+ INFOP("!! overrun !!");
-+ break;
-+ }
-+ DEBUGP("hdr: len=%u, %.*s", linelen, (int)linelen, ptcp+lineoff);
-+
-+ if (nf_strncasecmp(ptcp+lineoff, "Transport:", 10) == 0)
-+ {
-+ uint oldtcplen = tcplen;
-+ if (!rtsp_mangle_tran(ct, ctinfo, exp, pskb, lineoff, linelen))
-+ {
-+ break;
-+ }
-+ get_skb_tcpdata(*pskb, &ptcp, &tcplen);
-+ hdrslen -= (oldtcplen-tcplen);
-+ off -= (oldtcplen-tcplen);
-+ lineoff -= (oldtcplen-tcplen);
-+ linelen -= (oldtcplen-tcplen);
-+ DEBUGP("rep: len=%u, %.*s", linelen, (int)linelen, ptcp+lineoff);
-+ }
-+ }
-+
-+ return NF_ACCEPT;
-+}
-+
-+static uint
-+help_in(struct ip_conntrack* ct, enum ip_conntrack_info ctinfo,
-+ struct ip_conntrack_expect* exp, struct sk_buff** pskb)
-+{
-+ /* XXX: unmangle */
-+ return NF_ACCEPT;
-+}
-+
-+static uint
-+help(struct ip_conntrack* ct,
-+ struct ip_conntrack_expect* exp,
-+ struct ip_nat_info* info,
-+ enum ip_conntrack_info ctinfo,
-+ unsigned int hooknum,
-+ struct sk_buff** pskb)
-+{
-+ struct iphdr* iph = (struct iphdr*)(*pskb)->nh.iph;
-+ struct tcphdr* tcph = (struct tcphdr*)((char*)iph + iph->ihl * 4);
-+ uint datalen;
-+ int dir;
-+ struct ip_ct_rtsp_expect* ct_rtsp_info;
-+ int rc = NF_ACCEPT;
-+
-+ if (ct == NULL || exp == NULL || info == NULL || pskb == NULL)
-+ {
-+ DEBUGP("!! null ptr (%p,%p,%p,%p) !!\n", ct, exp, info, pskb);
-+ return NF_ACCEPT;
-+ }
-+
-+ ct_rtsp_info = &exp->help.exp_rtsp_info;
-+
-+ /*
-+ * Only mangle things once: original direction in POST_ROUTING
-+ * and reply direction on PRE_ROUTING.
-+ */
-+ dir = CTINFO2DIR(ctinfo);
-+ if (!((hooknum == NF_IP_POST_ROUTING && dir == IP_CT_DIR_ORIGINAL)
-+ || (hooknum == NF_IP_PRE_ROUTING && dir == IP_CT_DIR_REPLY)))
-+ {
-+ DEBUGP("Not touching dir %s at hook %s\n",
-+ dir == IP_CT_DIR_ORIGINAL ? "ORIG" : "REPLY",
-+ hooknum == NF_IP_POST_ROUTING ? "POSTROUTING"
-+ : hooknum == NF_IP_PRE_ROUTING ? "PREROUTING"
-+ : hooknum == NF_IP_LOCAL_OUT ? "OUTPUT" : "???");
-+ return NF_ACCEPT;
-+ }
-+ DEBUGP("got beyond not touching\n");
-+
-+ datalen = (*pskb)->len - iph->ihl * 4 - tcph->doff * 4;
-+
-+ LOCK_BH(&ip_rtsp_lock);
-+ /* Ensure the packet contains all of the marked data */
-+ if (!between(exp->seq + ct_rtsp_info->len,
-+ ntohl(tcph->seq), ntohl(tcph->seq) + datalen))
-+ {
-+ /* Partial retransmission? Probably a hacker. */
-+ if (net_ratelimit())
-+ {
-+ INFOP("partial packet %u/%u in %u/%u\n",
-+ exp->seq, ct_rtsp_info->len, ntohl(tcph->seq), ntohl(tcph->seq) + datalen);
-+ }
-+ UNLOCK_BH(&ip_rtsp_lock);
-+ return NF_DROP;
-+ }
-+
-+ switch (dir)
-+ {
-+ case IP_CT_DIR_ORIGINAL:
-+ rc = help_out(ct, ctinfo, exp, pskb);
-+ break;
-+ case IP_CT_DIR_REPLY:
-+ rc = help_in(ct, ctinfo, exp, pskb);
-+ break;
-+ }
-+ UNLOCK_BH(&ip_rtsp_lock);
-+
-+ return rc;
-+}
-+
-+static struct ip_nat_helper ip_nat_rtsp_helpers[MAX_PORTS];
-+static char rtsp_names[MAX_PORTS][10];
-+
-+/* This function is intentionally _NOT_ defined as __exit */
-+static void
-+fini(void)
-+{
-+ int i;
-+
-+ for (i = 0; i < num_ports; i++)
-+ {
-+ DEBUGP("unregistering helper for port %d\n", ports[i]);
-+ ip_nat_helper_unregister(&ip_nat_rtsp_helpers[i]);
-+ }
-+}
-+
-+static int __init
-+init(void)
-+{
-+ int ret = 0;
-+ int i;
-+ struct ip_nat_helper* hlpr;
-+ char* tmpname;
-+
-+ printk("ip_nat_rtsp v" IP_NF_RTSP_VERSION " loading\n");
-+
-+ if (ports[0] == 0)
-+ {
-+ ports[0] = RTSP_PORT;
-+ }
-+
-+ for (i = 0; (i < MAX_PORTS) && ports[i] != 0; i++)
-+ {
-+ hlpr = &ip_nat_rtsp_helpers[i];
-+ memset(hlpr, 0, sizeof(struct ip_nat_helper));
-+
-+ hlpr->tuple.dst.protonum = IPPROTO_TCP;
-+ hlpr->tuple.src.u.tcp.port = htons(ports[i]);
-+ hlpr->mask.src.u.tcp.port = 0xFFFF;
-+ hlpr->mask.dst.protonum = 0xFFFF;
-+ hlpr->help = help;
-+ hlpr->flags = 0;
-+ hlpr->me = THIS_MODULE;
-+ hlpr->expect = expected;
-+
-+ tmpname = &rtsp_names[i][0];
-+ if (ports[i] == RTSP_PORT)
-+ {
-+ sprintf(tmpname, "rtsp");
-+ }
-+ else
-+ {
-+ sprintf(tmpname, "rtsp-%d", i);
-+ }
-+ hlpr->name = tmpname;
-+
-+ DEBUGP("registering helper for port %d: name %s\n", ports[i], hlpr->name);
-+ ret = ip_nat_helper_register(hlpr);
-+
-+ if (ret)
-+ {
-+ printk("ip_nat_rtsp: error registering helper for port %d\n", ports[i]);
-+ fini();
-+ return 1;
-+ }
-+ num_ports++;
-+ }
-+ if (stunaddr != NULL)
-+ {
-+ extip = in_aton(stunaddr);
-+ }
-+ if (destaction != NULL)
-+ {
-+ if (strcmp(destaction, "auto") == 0)
-+ {
-+ dstact = DSTACT_AUTO;
-+ }
-+ if (strcmp(destaction, "strip") == 0)
-+ {
-+ dstact = DSTACT_STRIP;
-+ }
-+ if (strcmp(destaction, "none") == 0)
-+ {
-+ dstact = DSTACT_NONE;
-+ }
-+ }
-+ return ret;
-+}
-+
-+module_init(init);
-+module_exit(fini);
---- a/arch/mips/kernel/mips_ksyms.c
-+++ b/arch/mips/kernel/mips_ksyms.c
-@@ -52,6 +52,7 @@ EXPORT_SYMBOL(EISA_bus);
- /*
- * String functions
- */
-+EXPORT_SYMBOL_NOVERS(memchr);
- EXPORT_SYMBOL_NOVERS(memcmp);
- EXPORT_SYMBOL_NOVERS(memset);
- EXPORT_SYMBOL_NOVERS(memcpy);
---- /dev/null
-+++ b/include/linux/netfilter_helpers.h
-@@ -0,0 +1,133 @@
-+/*
-+ * Helpers for netfiler modules. This file provides implementations for basic
-+ * functions such as strncasecmp(), etc.
-+ *
-+ * gcc will warn for defined but unused functions, so we only include the
-+ * functions requested. The following macros are used:
-+ * NF_NEED_STRNCASECMP nf_strncasecmp()
-+ * NF_NEED_STRTOU16 nf_strtou16()
-+ * NF_NEED_STRTOU32 nf_strtou32()
-+ */
-+#ifndef _NETFILTER_HELPERS_H
-+#define _NETFILTER_HELPERS_H
-+
-+/* Only include these functions for kernel code. */
-+#ifdef __KERNEL__
-+
-+#include <linux/ctype.h>
-+#define iseol(c) ( (c) == '\r' || (c) == '\n' )
-+
-+/*
-+ * The standard strncasecmp()
-+ */
-+#ifdef NF_NEED_STRNCASECMP
-+static int
-+nf_strncasecmp(const char* s1, const char* s2, u_int32_t len)
-+{
-+ if (s1 == NULL || s2 == NULL)
-+ {
-+ if (s1 == NULL && s2 == NULL)
-+ {
-+ return 0;
-+ }
-+ return (s1 == NULL) ? -1 : 1;
-+ }
-+ while (len > 0 && tolower(*s1) == tolower(*s2))
-+ {
-+ len--;
-+ s1++;
-+ s2++;
-+ }
-+ return ( (len == 0) ? 0 : (tolower(*s1) - tolower(*s2)) );
-+}
-+#endif /* NF_NEED_STRNCASECMP */
-+
-+/*
-+ * Parse a string containing a 16-bit unsigned integer.
-+ * Returns the number of chars used, or zero if no number is found.
-+ */
-+#ifdef NF_NEED_STRTOU16
-+static int
-+nf_strtou16(const char* pbuf, u_int16_t* pval)
-+{
-+ int n = 0;
-+
-+ *pval = 0;
-+ while (isdigit(pbuf[n]))
-+ {
-+ *pval = (*pval * 10) + (pbuf[n] - '0');
-+ n++;
-+ }
-+
-+ return n;
-+}
-+#endif /* NF_NEED_STRTOU16 */
-+
-+/*
-+ * Parse a string containing a 32-bit unsigned integer.
-+ * Returns the number of chars used, or zero if no number is found.
-+ */
-+#ifdef NF_NEED_STRTOU32
-+static int
-+nf_strtou32(const char* pbuf, u_int32_t* pval)
-+{
-+ int n = 0;
-+
-+ *pval = 0;
-+ while (pbuf[n] >= '0' && pbuf[n] <= '9')
-+ {
-+ *pval = (*pval * 10) + (pbuf[n] - '0');
-+ n++;
-+ }
-+
-+ return n;
-+}
-+#endif /* NF_NEED_STRTOU32 */
-+
-+/*
-+ * Given a buffer and length, advance to the next line and mark the current
-+ * line.
-+ */
-+#ifdef NF_NEED_NEXTLINE
-+static int
-+nf_nextline(char* p, uint len, uint* poff, uint* plineoff, uint* plinelen)
-+{
-+ uint off = *poff;
-+ uint physlen = 0;
-+
-+ if (off >= len)
-+ {
-+ return 0;
-+ }
-+
-+ while (p[off] != '\n')
-+ {
-+ if (len-off <= 1)
-+ {
-+ return 0;
-+ }
-+
-+ physlen++;
-+ off++;
-+ }
-+
-+ /* if we saw a crlf, physlen needs adjusted */
-+ if (physlen > 0 && p[off] == '\n' && p[off-1] == '\r')
-+ {
-+ physlen--;
-+ }
-+
-+ /* advance past the newline */
-+ off++;
-+
-+ *plineoff = *poff;
-+ *plinelen = physlen;
-+ *poff = off;
-+
-+ return 1;
-+}
-+#endif /* NF_NEED_NEXTLINE */
-+
-+#endif /* __KERNEL__ */
-+
-+#endif /* _NETFILTER_HELPERS_H */
---- /dev/null
-+++ b/include/linux/netfilter_ipv4/ip_conntrack_rtsp.h
-@@ -0,0 +1,68 @@
-+/*
-+ * RTSP extension for IP connection tracking.
-+ * (C) 2003 by Tom Marshall <tmarshall@real.com>
-+ * based on ip_conntrack_irc.h
-+ *
-+ * 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_RTSP_H
-+#define _IP_CONNTRACK_RTSP_H
-+
-+/* #define IP_NF_RTSP_DEBUG */
-+#define IP_NF_RTSP_VERSION "0.01"
-+
-+/* port block types */
-+typedef enum {
-+ pb_single, /* client_port=x */
-+ pb_range, /* client_port=x-y */
-+ pb_discon /* client_port=x/y (rtspbis) */
-+} portblock_t;
-+
-+/* We record seq number and length of rtsp headers here, all in host order. */
-+
-+/*
-+ * This structure is per expected connection. It is a member of struct
-+ * ip_conntrack_expect. The TCP SEQ for the conntrack expect is stored
-+ * there and we are expected to only store the length of the data which
-+ * needs replaced. If a packet contains multiple RTSP messages, we create
-+ * one expected connection per message.
-+ *
-+ * We use these variables to mark the entire header block. This may seem
-+ * like overkill, but the nature of RTSP requires it. A header may appear
-+ * multiple times in a message. We must treat two Transport headers the
-+ * same as one Transport header with two entries.
-+ */
-+struct ip_ct_rtsp_expect
-+{
-+ u_int32_t len; /* length of header block */
-+ portblock_t pbtype; /* Type of port block that was requested */
-+ u_int16_t loport; /* Port that was requested, low or first */
-+ u_int16_t hiport; /* Port that was requested, high or second */
-+#if 0
-+ uint method; /* RTSP method */
-+ uint cseq; /* CSeq from request */
-+#endif
-+};
-+
-+/* This structure exists only once per master */
-+struct ip_ct_rtsp_master
-+{
-+ /* Empty (?) */
-+};
-+
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/netfilter_ipv4/lockhelp.h>
-+
-+#define RTSP_PORT 554
-+
-+/* Protects rtsp part of conntracks */
-+DECLARE_LOCK_EXTERN(ip_rtsp_lock);
-+
-+#endif /* __KERNEL__ */
-+
-+#endif /* _IP_CONNTRACK_RTSP_H */
---- /dev/null
-+++ b/include/linux/netfilter_mime.h
-@@ -0,0 +1,90 @@
-+/*
-+ * MIME functions for netfilter modules. This file provides implementations
-+ * for basic MIME parsing. MIME headers are used in many protocols, such as
-+ * HTTP, RTSP, SIP, etc.
-+ *
-+ * gcc will warn for defined but unused functions, so we only include the
-+ * functions requested. The following macros are used:
-+ * NF_NEED_MIME_NEXTLINE nf_mime_nextline()
-+ */
-+#ifndef _NETFILTER_MIME_H
-+#define _NETFILTER_MIME_H
-+
-+/* Only include these functions for kernel code. */
-+#ifdef __KERNEL__
-+
-+#include <linux/kernel.h>
-+#include <linux/ctype.h>
-+
-+/*
-+ * Given a buffer and length, advance to the next line and mark the current
-+ * line. If the current line is empty, *plinelen will be set to zero. If
-+ * not, it will be set to the actual line length (including CRLF).
-+ *
-+ * 'line' in this context means logical line (includes LWS continuations).
-+ * Returns 1 on success, 0 on failure.
-+ */
-+#ifdef NF_NEED_MIME_NEXTLINE
-+static int
-+nf_mime_nextline(char* p, uint len, uint* poff, uint* plineoff, uint* plinelen)
-+{
-+ uint off = *poff;
-+ uint physlen = 0;
-+ int is_first_line = 1;
-+
-+ if (off >= len)
-+ {
-+ return 0;
-+ }
-+
-+ do
-+ {
-+ while (p[off] != '\n')
-+ {
-+ if (len-off <= 1)
-+ {
-+ return 0;
-+ }
-+
-+ physlen++;
-+ off++;
-+ }
-+
-+ /* if we saw a crlf, physlen needs adjusted */
-+ if (physlen > 0 && p[off] == '\n' && p[off-1] == '\r')
-+ {
-+ physlen--;
-+ }
-+
-+ /* advance past the newline */
-+ off++;
-+
-+ /* check for an empty line */
-+ if (physlen == 0)
-+ {
-+ break;
-+ }
-+
-+ /* check for colon on the first physical line */
-+ if (is_first_line)
-+ {
-+ is_first_line = 0;
-+ if (memchr(p+(*poff), ':', physlen) == NULL)
-+ {
-+ return 0;
-+ }
-+ }
-+ }
-+ while (p[off] == ' ' || p[off] == '\t');
-+
-+ *plineoff = *poff;
-+ *plinelen = (physlen == 0) ? 0 : (off - *poff);
-+ *poff = off;
-+
-+ return 1;
-+}
-+#endif /* NF_NEED_MIME_NEXTLINE */
-+
-+#endif /* __KERNEL__ */
-+
-+#endif /* _NETFILTER_MIME_H */
---- a/include/linux/netfilter_ipv4/ip_conntrack.h
-+++ b/include/linux/netfilter_ipv4/ip_conntrack.h
-@@ -68,6 +68,7 @@ union ip_conntrack_expect_proto {
- #include <linux/netfilter_ipv4/ip_conntrack_ftp.h>
- #include <linux/netfilter_ipv4/ip_conntrack_irc.h>
- #include <linux/netfilter_ipv4/ip_conntrack_h323.h>
-+#include <linux/netfilter_ipv4/ip_conntrack_rtsp.h>
-
- /* per expectation: application helper private data */
- union ip_conntrack_expect_help {
-@@ -76,6 +77,7 @@ union ip_conntrack_expect_help {
- struct ip_ct_ftp_expect exp_ftp_info;
- struct ip_ct_irc_expect exp_irc_info;
- struct ip_ct_h225_expect exp_h225_info;
-+ struct ip_ct_rtsp_expect exp_rtsp_info;
-
- #ifdef CONFIG_IP_NF_NAT_NEEDED
- union {
-@@ -90,6 +92,7 @@ union ip_conntrack_help {
- struct ip_ct_ftp_master ct_ftp_info;
- struct ip_ct_irc_master ct_irc_info;
- struct ip_ct_h225_master ct_h225_info;
-+ struct ip_ct_rtsp_master ct_rtsp_info;
- };
-
- #ifdef CONFIG_IP_NF_NAT_NEEDED
+++ /dev/null
---- /dev/null
-+++ b/include/linux/netfilter/nf_conntrack_rtsp.h
-@@ -0,0 +1,63 @@
-+/*
-+ * RTSP extension for IP connection tracking.
-+ * (C) 2003 by Tom Marshall <tmarshall at real.com>
-+ * based on ip_conntrack_irc.h
-+ *
-+ * 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_RTSP_H
-+#define _IP_CONNTRACK_RTSP_H
-+
-+//#define IP_NF_RTSP_DEBUG 1
-+#define IP_NF_RTSP_VERSION "0.6.21"
-+
-+#ifdef __KERNEL__
-+/* port block types */
-+typedef enum {
-+ pb_single, /* client_port=x */
-+ pb_range, /* client_port=x-y */
-+ pb_discon /* client_port=x/y (rtspbis) */
-+} portblock_t;
-+
-+/* We record seq number and length of rtsp headers here, all in host order. */
-+
-+/*
-+ * This structure is per expected connection. It is a member of struct
-+ * ip_conntrack_expect. The TCP SEQ for the conntrack expect is stored
-+ * there and we are expected to only store the length of the data which
-+ * needs replaced. If a packet contains multiple RTSP messages, we create
-+ * one expected connection per message.
-+ *
-+ * We use these variables to mark the entire header block. This may seem
-+ * like overkill, but the nature of RTSP requires it. A header may appear
-+ * multiple times in a message. We must treat two Transport headers the
-+ * same as one Transport header with two entries.
-+ */
-+struct ip_ct_rtsp_expect
-+{
-+ u_int32_t len; /* length of header block */
-+ portblock_t pbtype; /* Type of port block that was requested */
-+ u_int16_t loport; /* Port that was requested, low or first */
-+ u_int16_t hiport; /* Port that was requested, high or second */
-+#if 0
-+ uint method; /* RTSP method */
-+ uint cseq; /* CSeq from request */
-+#endif
-+};
-+
-+extern unsigned int (*nf_nat_rtsp_hook)(struct sk_buff *skb,
-+ enum ip_conntrack_info ctinfo,
-+ unsigned int matchoff, unsigned int matchlen,
-+ struct ip_ct_rtsp_expect *prtspexp,
-+ struct nf_conntrack_expect *exp);
-+
-+extern void (*nf_nat_rtsp_hook_expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
-+
-+#define RTSP_PORT 554
-+
-+#endif /* __KERNEL__ */
-+
-+#endif /* _IP_CONNTRACK_RTSP_H */
---- /dev/null
-+++ b/include/linux/netfilter_helpers.h
-@@ -0,0 +1,133 @@
-+/*
-+ * Helpers for netfiler modules. This file provides implementations for basic
-+ * functions such as strncasecmp(), etc.
-+ *
-+ * gcc will warn for defined but unused functions, so we only include the
-+ * functions requested. The following macros are used:
-+ * NF_NEED_STRNCASECMP nf_strncasecmp()
-+ * NF_NEED_STRTOU16 nf_strtou16()
-+ * NF_NEED_STRTOU32 nf_strtou32()
-+ */
-+#ifndef _NETFILTER_HELPERS_H
-+#define _NETFILTER_HELPERS_H
-+
-+/* Only include these functions for kernel code. */
-+#ifdef __KERNEL__
-+
-+#include <linux/ctype.h>
-+#define iseol(c) ( (c) == '\r' || (c) == '\n' )
-+
-+/*
-+ * The standard strncasecmp()
-+ */
-+#ifdef NF_NEED_STRNCASECMP
-+static int
-+nf_strncasecmp(const char* s1, const char* s2, u_int32_t len)
-+{
-+ if (s1 == NULL || s2 == NULL)
-+ {
-+ if (s1 == NULL && s2 == NULL)
-+ {
-+ return 0;
-+ }
-+ return (s1 == NULL) ? -1 : 1;
-+ }
-+ while (len > 0 && tolower(*s1) == tolower(*s2))
-+ {
-+ len--;
-+ s1++;
-+ s2++;
-+ }
-+ return ( (len == 0) ? 0 : (tolower(*s1) - tolower(*s2)) );
-+}
-+#endif /* NF_NEED_STRNCASECMP */
-+
-+/*
-+ * Parse a string containing a 16-bit unsigned integer.
-+ * Returns the number of chars used, or zero if no number is found.
-+ */
-+#ifdef NF_NEED_STRTOU16
-+static int
-+nf_strtou16(const char* pbuf, u_int16_t* pval)
-+{
-+ int n = 0;
-+
-+ *pval = 0;
-+ while (isdigit(pbuf[n]))
-+ {
-+ *pval = (*pval * 10) + (pbuf[n] - '0');
-+ n++;
-+ }
-+
-+ return n;
-+}
-+#endif /* NF_NEED_STRTOU16 */
-+
-+/*
-+ * Parse a string containing a 32-bit unsigned integer.
-+ * Returns the number of chars used, or zero if no number is found.
-+ */
-+#ifdef NF_NEED_STRTOU32
-+static int
-+nf_strtou32(const char* pbuf, u_int32_t* pval)
-+{
-+ int n = 0;
-+
-+ *pval = 0;
-+ while (pbuf[n] >= '0' && pbuf[n] <= '9')
-+ {
-+ *pval = (*pval * 10) + (pbuf[n] - '0');
-+ n++;
-+ }
-+
-+ return n;
-+}
-+#endif /* NF_NEED_STRTOU32 */
-+
-+/*
-+ * Given a buffer and length, advance to the next line and mark the current
-+ * line.
-+ */
-+#ifdef NF_NEED_NEXTLINE
-+static int
-+nf_nextline(char* p, uint len, uint* poff, uint* plineoff, uint* plinelen)
-+{
-+ uint off = *poff;
-+ uint physlen = 0;
-+
-+ if (off >= len)
-+ {
-+ return 0;
-+ }
-+
-+ while (p[off] != '\n')
-+ {
-+ if (len-off <= 1)
-+ {
-+ return 0;
-+ }
-+
-+ physlen++;
-+ off++;
-+ }
-+
-+ /* if we saw a crlf, physlen needs adjusted */
-+ if (physlen > 0 && p[off] == '\n' && p[off-1] == '\r')
-+ {
-+ physlen--;
-+ }
-+
-+ /* advance past the newline */
-+ off++;
-+
-+ *plineoff = *poff;
-+ *plinelen = physlen;
-+ *poff = off;
-+
-+ return 1;
-+}
-+#endif /* NF_NEED_NEXTLINE */
-+
-+#endif /* __KERNEL__ */
-+
-+#endif /* _NETFILTER_HELPERS_H */
---- /dev/null
-+++ b/include/linux/netfilter_mime.h
-@@ -0,0 +1,89 @@
-+/*
-+ * MIME functions for netfilter modules. This file provides implementations
-+ * for basic MIME parsing. MIME headers are used in many protocols, such as
-+ * HTTP, RTSP, SIP, etc.
-+ *
-+ * gcc will warn for defined but unused functions, so we only include the
-+ * functions requested. The following macros are used:
-+ * NF_NEED_MIME_NEXTLINE nf_mime_nextline()
-+ */
-+#ifndef _NETFILTER_MIME_H
-+#define _NETFILTER_MIME_H
-+
-+/* Only include these functions for kernel code. */
-+#ifdef __KERNEL__
-+
-+#include <linux/ctype.h>
-+
-+/*
-+ * Given a buffer and length, advance to the next line and mark the current
-+ * line. If the current line is empty, *plinelen will be set to zero. If
-+ * not, it will be set to the actual line length (including CRLF).
-+ *
-+ * 'line' in this context means logical line (includes LWS continuations).
-+ * Returns 1 on success, 0 on failure.
-+ */
-+#ifdef NF_NEED_MIME_NEXTLINE
-+static int
-+nf_mime_nextline(char* p, uint len, uint* poff, uint* plineoff, uint* plinelen)
-+{
-+ uint off = *poff;
-+ uint physlen = 0;
-+ int is_first_line = 1;
-+
-+ if (off >= len)
-+ {
-+ return 0;
-+ }
-+
-+ do
-+ {
-+ while (p[off] != '\n')
-+ {
-+ if (len-off <= 1)
-+ {
-+ return 0;
-+ }
-+
-+ physlen++;
-+ off++;
-+ }
-+
-+ /* if we saw a crlf, physlen needs adjusted */
-+ if (physlen > 0 && p[off] == '\n' && p[off-1] == '\r')
-+ {
-+ physlen--;
-+ }
-+
-+ /* advance past the newline */
-+ off++;
-+
-+ /* check for an empty line */
-+ if (physlen == 0)
-+ {
-+ break;
-+ }
-+
-+ /* check for colon on the first physical line */
-+ if (is_first_line)
-+ {
-+ is_first_line = 0;
-+ if (memchr(p+(*poff), ':', physlen) == NULL)
-+ {
-+ return 0;
-+ }
-+ }
-+ }
-+ while (p[off] == ' ' || p[off] == '\t');
-+
-+ *plineoff = *poff;
-+ *plinelen = (physlen == 0) ? 0 : (off - *poff);
-+ *poff = off;
-+
-+ return 1;
-+}
-+#endif /* NF_NEED_MIME_NEXTLINE */
-+
-+#endif /* __KERNEL__ */
-+
-+#endif /* _NETFILTER_MIME_H */
---- a/net/ipv4/netfilter/Makefile
-+++ b/net/ipv4/netfilter/Makefile
-@@ -26,6 +26,7 @@ obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_am
- obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
- obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323.o
- obj-$(CONFIG_NF_NAT_IRC) += nf_nat_irc.o
-+obj-$(CONFIG_NF_NAT_RTSP) += nf_nat_rtsp.o
- obj-$(CONFIG_NF_NAT_PPTP) += nf_nat_pptp.o
- obj-$(CONFIG_NF_NAT_SIP) += nf_nat_sip.o
- obj-$(CONFIG_NF_NAT_SNMP_BASIC) += nf_nat_snmp_basic.o
---- a/net/netfilter/Kconfig
-+++ b/net/netfilter/Kconfig
-@@ -267,6 +267,16 @@ config NF_CONNTRACK_TFTP
-
- To compile it as a module, choose M here. If unsure, say N.
-
-+config NF_CONNTRACK_RTSP
-+ tristate "RTSP protocol support"
-+ depends on NF_CONNTRACK
-+ help
-+ Support the RTSP protocol. This allows UDP transports to be setup
-+ properly, including RTP and RDT.
-+
-+ If you want to compile it as a module, say 'M' here and read
-+ Documentation/modules.txt. If unsure, say 'Y'.
-+
- config NF_CT_NETLINK
- tristate 'Connection tracking netlink interface'
- select NETFILTER_NETLINK
---- a/net/netfilter/Makefile
-+++ b/net/netfilter/Makefile
-@@ -33,6 +33,7 @@ obj-$(CONFIG_NF_CONNTRACK_PPTP) += nf_co
- obj-$(CONFIG_NF_CONNTRACK_SANE) += nf_conntrack_sane.o
- obj-$(CONFIG_NF_CONNTRACK_SIP) += nf_conntrack_sip.o
- obj-$(CONFIG_NF_CONNTRACK_TFTP) += nf_conntrack_tftp.o
-+obj-$(CONFIG_NF_CONNTRACK_RTSP) += nf_conntrack_rtsp.o
-
- # transparent proxy support
- obj-$(CONFIG_NETFILTER_TPROXY) += nf_tproxy_core.o
---- a/net/ipv4/netfilter/Kconfig
-+++ b/net/ipv4/netfilter/Kconfig
-@@ -257,6 +257,11 @@ config NF_NAT_IRC
- depends on NF_CONNTRACK && NF_NAT
- default NF_NAT && NF_CONNTRACK_IRC
-
-+config NF_NAT_RTSP
-+ tristate
-+ depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
-+ default NF_NAT && NF_CONNTRACK_RTSP
-+
- config NF_NAT_TFTP
- tristate
- depends on NF_CONNTRACK && NF_NAT
---- /dev/null
-+++ b/net/netfilter/nf_conntrack_rtsp.c
-@@ -0,0 +1,517 @@
-+/*
-+ * RTSP extension for IP connection tracking
-+ * (C) 2003 by Tom Marshall <tmarshall at real.com>
-+ * based on ip_conntrack_irc.c
-+ *
-+ * 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 nf_conntrack_rtsp.o ports=port1,port2,...port<MAX_PORTS>
-+ * max_outstanding=n setup_timeout=secs
-+ *
-+ * If no ports are specified, the default will be port 554.
-+ *
-+ * With max_outstanding you can define the maximum number of not yet
-+ * answered SETUP requests per RTSP session (default 8).
-+ * With setup_timeout you can specify how long the system waits for
-+ * an expected data channel (default 300 seconds).
-+ *
-+ * 2005-02-13: Harald Welte <laforge at netfilter.org>
-+ * - port to 2.6
-+ * - update to recent post-2.6.11 api changes
-+ * 2006-09-14: Steven Van Acker <deepstar at singularity.be>
-+ * - removed calls to NAT code from conntrack helper: NAT no longer needed to use rtsp-conntrack
-+ * 2007-04-18: Michael Guntsche <mike at it-loops.com>
-+ * - Port to new NF API
-+ */
-+
-+#include <linux/module.h>
-+#include <linux/netfilter.h>
-+#include <linux/ip.h>
-+#include <linux/inet.h>
-+#include <net/tcp.h>
-+
-+#include <net/netfilter/nf_conntrack.h>
-+#include <net/netfilter/nf_conntrack_expect.h>
-+#include <net/netfilter/nf_conntrack_helper.h>
-+#include <linux/netfilter/nf_conntrack_rtsp.h>
-+
-+#define NF_NEED_STRNCASECMP
-+#define NF_NEED_STRTOU16
-+#define NF_NEED_STRTOU32
-+#define NF_NEED_NEXTLINE
-+#include <linux/netfilter_helpers.h>
-+#define NF_NEED_MIME_NEXTLINE
-+#include <linux/netfilter_mime.h>
-+
-+#include <linux/ctype.h>
-+#define MAX_SIMUL_SETUP 8 /* XXX: use max_outstanding */
-+#define INFOP(fmt, args...) printk(KERN_INFO "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#if 0
-+#define DEBUGP(fmt, args...) printk(KERN_DEBUG "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#else
-+#define DEBUGP(fmt, args...)
-+#endif
-+
-+#define MAX_PORTS 8
-+static int ports[MAX_PORTS];
-+static int num_ports = 0;
-+static int max_outstanding = 8;
-+static unsigned int setup_timeout = 300;
-+
-+MODULE_AUTHOR("Tom Marshall <tmarshall at real.com>");
-+MODULE_DESCRIPTION("RTSP connection tracking module");
-+MODULE_LICENSE("GPL");
-+module_param_array(ports, int, &num_ports, 0400);
-+MODULE_PARM_DESC(ports, "port numbers of RTSP servers");
-+module_param(max_outstanding, int, 0400);
-+MODULE_PARM_DESC(max_outstanding, "max number of outstanding SETUP requests per RTSP session");
-+module_param(setup_timeout, int, 0400);
-+MODULE_PARM_DESC(setup_timeout, "timeout on for unestablished data channels");
-+
-+static char *rtsp_buffer;
-+static DEFINE_SPINLOCK(rtsp_buffer_lock);
-+
-+unsigned int (*nf_nat_rtsp_hook)(struct sk_buff *skb,
-+ enum ip_conntrack_info ctinfo,
-+ unsigned int matchoff, unsigned int matchlen,struct ip_ct_rtsp_expect* prtspexp,
-+ struct nf_conntrack_expect *exp);
-+void (*nf_nat_rtsp_hook_expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
-+
-+EXPORT_SYMBOL_GPL(nf_nat_rtsp_hook);
-+
-+/*
-+ * Max mappings we will allow for one RTSP connection (for RTP, the number
-+ * of allocated ports is twice this value). Note that SMIL burns a lot of
-+ * ports so keep this reasonably high. If this is too low, you will see a
-+ * lot of "no free client map entries" messages.
-+ */
-+#define MAX_PORT_MAPS 16
-+
-+/*** default port list was here in the masq code: 554, 3030, 4040 ***/
-+
-+#define SKIP_WSPACE(ptr,len,off) while(off < len && isspace(*(ptr+off))) { off++; }
-+
-+/*
-+ * Parse an RTSP packet.
-+ *
-+ * Returns zero if parsing failed.
-+ *
-+ * Parameters:
-+ * IN ptcp tcp data pointer
-+ * IN tcplen tcp data len
-+ * IN/OUT ptcpoff points to current tcp offset
-+ * OUT phdrsoff set to offset of rtsp headers
-+ * OUT phdrslen set to length of rtsp headers
-+ * OUT pcseqoff set to offset of CSeq header
-+ * OUT pcseqlen set to length of CSeq header
-+ */
-+static int
-+rtsp_parse_message(char* ptcp, uint tcplen, uint* ptcpoff,
-+ uint* phdrsoff, uint* phdrslen,
-+ uint* pcseqoff, uint* pcseqlen,
-+ uint* transoff, uint* translen)
-+{
-+ uint entitylen = 0;
-+ uint lineoff;
-+ uint linelen;
-+
-+ if (!nf_nextline(ptcp, tcplen, ptcpoff, &lineoff, &linelen))
-+ return 0;
-+
-+ *phdrsoff = *ptcpoff;
-+ while (nf_mime_nextline(ptcp, tcplen, ptcpoff, &lineoff, &linelen)) {
-+ if (linelen == 0) {
-+ if (entitylen > 0)
-+ *ptcpoff += min(entitylen, tcplen - *ptcpoff);
-+ break;
-+ }
-+ if (lineoff+linelen > tcplen) {
-+ INFOP("!! overrun !!\n");
-+ break;
-+ }
-+
-+ if (nf_strncasecmp(ptcp+lineoff, "CSeq:", 5) == 0) {
-+ *pcseqoff = lineoff;
-+ *pcseqlen = linelen;
-+ }
-+
-+ if (nf_strncasecmp(ptcp+lineoff, "Transport:", 10) == 0) {
-+ *transoff = lineoff;
-+ *translen = linelen;
-+ }
-+
-+ if (nf_strncasecmp(ptcp+lineoff, "Content-Length:", 15) == 0) {
-+ uint off = lineoff+15;
-+ SKIP_WSPACE(ptcp+lineoff, linelen, off);
-+ nf_strtou32(ptcp+off, &entitylen);
-+ }
-+ }
-+ *phdrslen = (*ptcpoff) - (*phdrsoff);
-+
-+ return 1;
-+}
-+
-+/*
-+ * Find lo/hi client ports (if any) in transport header
-+ * In:
-+ * ptcp, tcplen = packet
-+ * tranoff, tranlen = buffer to search
-+ *
-+ * Out:
-+ * pport_lo, pport_hi = lo/hi ports (host endian)
-+ *
-+ * Returns nonzero if any client ports found
-+ *
-+ * Note: it is valid (and expected) for the client to request multiple
-+ * transports, so we need to parse the entire line.
-+ */
-+static int
-+rtsp_parse_transport(char* ptran, uint tranlen,
-+ struct ip_ct_rtsp_expect* prtspexp)
-+{
-+ int rc = 0;
-+ uint off = 0;
-+
-+ if (tranlen < 10 || !iseol(ptran[tranlen-1]) ||
-+ nf_strncasecmp(ptran, "Transport:", 10) != 0) {
-+ INFOP("sanity check failed\n");
-+ return 0;
-+ }
-+
-+ DEBUGP("tran='%.*s'\n", (int)tranlen, ptran);
-+ off += 10;
-+ SKIP_WSPACE(ptran, tranlen, off);
-+
-+ /* Transport: tran;field;field=val,tran;field;field=val,... */
-+ while (off < tranlen) {
-+ const char* pparamend;
-+ uint nextparamoff;
-+
-+ pparamend = memchr(ptran+off, ',', tranlen-off);
-+ pparamend = (pparamend == NULL) ? ptran+tranlen : pparamend+1;
-+ nextparamoff = pparamend-ptran;
-+
-+ while (off < nextparamoff) {
-+ const char* pfieldend;
-+ uint nextfieldoff;
-+
-+ pfieldend = memchr(ptran+off, ';', nextparamoff-off);
-+ nextfieldoff = (pfieldend == NULL) ? nextparamoff : pfieldend-ptran+1;
-+
-+ if (strncmp(ptran+off, "client_port=", 12) == 0) {
-+ u_int16_t port;
-+ uint numlen;
-+
-+ off += 12;
-+ numlen = nf_strtou16(ptran+off, &port);
-+ off += numlen;
-+ if (prtspexp->loport != 0 && prtspexp->loport != port)
-+ DEBUGP("multiple ports found, port %hu ignored\n", port);
-+ else {
-+ DEBUGP("lo port found : %hu\n", port);
-+ prtspexp->loport = prtspexp->hiport = port;
-+ if (ptran[off] == '-') {
-+ off++;
-+ numlen = nf_strtou16(ptran+off, &port);
-+ off += numlen;
-+ prtspexp->pbtype = pb_range;
-+ prtspexp->hiport = port;
-+
-+ // If we have a range, assume rtp:
-+ // loport must be even, hiport must be loport+1
-+ if ((prtspexp->loport & 0x0001) != 0 ||
-+ prtspexp->hiport != prtspexp->loport+1) {
-+ DEBUGP("incorrect range: %hu-%hu, correcting\n",
-+ prtspexp->loport, prtspexp->hiport);
-+ prtspexp->loport &= 0xfffe;
-+ prtspexp->hiport = prtspexp->loport+1;
-+ }
-+ } else if (ptran[off] == '/') {
-+ off++;
-+ numlen = nf_strtou16(ptran+off, &port);
-+ off += numlen;
-+ prtspexp->pbtype = pb_discon;
-+ prtspexp->hiport = port;
-+ }
-+ rc = 1;
-+ }
-+ }
-+
-+ /*
-+ * Note we don't look for the destination parameter here.
-+ * If we are using NAT, the NAT module will handle it. If not,
-+ * and the client is sending packets elsewhere, the expectation
-+ * will quietly time out.
-+ */
-+
-+ off = nextfieldoff;
-+ }
-+
-+ off = nextparamoff;
-+ }
-+
-+ return rc;
-+}
-+
-+void expected(struct nf_conn *ct, struct nf_conntrack_expect *exp)
-+{
-+ if(nf_nat_rtsp_hook_expectfn) {
-+ nf_nat_rtsp_hook_expectfn(ct,exp);
-+ }
-+}
-+
-+/*** conntrack functions ***/
-+
-+/* outbound packet: client->server */
-+
-+static inline int
-+help_out(struct sk_buff *skb, unsigned char *rb_ptr, unsigned int datalen,
-+ struct nf_conn *ct, enum ip_conntrack_info ctinfo)
-+{
-+ struct ip_ct_rtsp_expect expinfo;
-+
-+ int dir = CTINFO2DIR(ctinfo); /* = IP_CT_DIR_ORIGINAL */
-+ //struct tcphdr* tcph = (void*)iph + iph->ihl * 4;
-+ //uint tcplen = pktlen - iph->ihl * 4;
-+ char* pdata = rb_ptr;
-+ //uint datalen = tcplen - tcph->doff * 4;
-+ uint dataoff = 0;
-+ int ret = NF_ACCEPT;
-+
-+ struct nf_conntrack_expect *exp;
-+
-+ __be16 be_loport;
-+
-+ memset(&expinfo, 0, sizeof(expinfo));
-+
-+ while (dataoff < datalen) {
-+ uint cmdoff = dataoff;
-+ uint hdrsoff = 0;
-+ uint hdrslen = 0;
-+ uint cseqoff = 0;
-+ uint cseqlen = 0;
-+ uint transoff = 0;
-+ uint translen = 0;
-+ uint off;
-+
-+ if (!rtsp_parse_message(pdata, datalen, &dataoff,
-+ &hdrsoff, &hdrslen,
-+ &cseqoff, &cseqlen,
-+ &transoff, &translen))
-+ break; /* not a valid message */
-+
-+ if (strncmp(pdata+cmdoff, "SETUP ", 6) != 0)
-+ continue; /* not a SETUP message */
-+ DEBUGP("found a setup message\n");
-+
-+ off = 0;
-+ if(translen) {
-+ rtsp_parse_transport(pdata+transoff, translen, &expinfo);
-+ }
-+
-+ if (expinfo.loport == 0) {
-+ DEBUGP("no udp transports found\n");
-+ continue; /* no udp transports found */
-+ }
-+
-+ DEBUGP("udp transport found, ports=(%d,%hu,%hu)\n",
-+ (int)expinfo.pbtype, expinfo.loport, expinfo.hiport);
-+
-+ exp = nf_ct_expect_alloc(ct);
-+ if (!exp) {
-+ ret = NF_DROP;
-+ goto out;
-+ }
-+
-+ be_loport = htons(expinfo.loport);
-+
-+ nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT,
-+ ct->tuplehash[!dir].tuple.src.l3num,
-+ &ct->tuplehash[!dir].tuple.src.u3, &ct->tuplehash[!dir].tuple.dst.u3,
-+ IPPROTO_UDP, NULL, &be_loport);
-+
-+ exp->master = ct;
-+
-+ exp->expectfn = expected;
-+ exp->flags = 0;
-+
-+ if (expinfo.pbtype == pb_range) {
-+ DEBUGP("Changing expectation mask to handle multiple ports\n");
-+ exp->mask.src.u.udp.port = 0xfffe;
-+ }
-+
-+ DEBUGP("expect_related %u.%u.%u.%u:%u-%u.%u.%u.%u:%u\n",
-+ NIPQUAD(exp->tuple.src.u3.ip),
-+ ntohs(exp->tuple.src.u.udp.port),
-+ NIPQUAD(exp->tuple.dst.u3.ip),
-+ ntohs(exp->tuple.dst.u.udp.port));
-+
-+ if (nf_nat_rtsp_hook)
-+ /* pass the request off to the nat helper */
-+ ret = nf_nat_rtsp_hook(skb, ctinfo, hdrsoff, hdrslen, &expinfo, exp);
-+ else if (nf_ct_expect_related(exp) != 0) {
-+ INFOP("nf_ct_expect_related failed\n");
-+ ret = NF_DROP;
-+ }
-+ nf_ct_expect_put(exp);
-+ goto out;
-+ }
-+out:
-+
-+ return ret;
-+}
-+
-+
-+static inline int
-+help_in(struct sk_buff *skb, size_t pktlen,
-+ struct nf_conn* ct, enum ip_conntrack_info ctinfo)
-+{
-+ return NF_ACCEPT;
-+}
-+
-+static int help(struct sk_buff *skb, unsigned int protoff,
-+ struct nf_conn *ct, enum ip_conntrack_info ctinfo)
-+{
-+ struct tcphdr _tcph, *th;
-+ unsigned int dataoff, datalen;
-+ char *rb_ptr;
-+ int ret = NF_DROP;
-+
-+ /* 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 whole TCP header? */
-+ th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
-+
-+ if (!th)
-+ return NF_ACCEPT;
-+
-+ /* No data ? */
-+ dataoff = protoff + th->doff*4;
-+ datalen = skb->len - dataoff;
-+ if (dataoff >= skb->len)
-+ return NF_ACCEPT;
-+
-+ spin_lock_bh(&rtsp_buffer_lock);
-+ rb_ptr = skb_header_pointer(skb, dataoff,
-+ skb->len - dataoff, rtsp_buffer);
-+ BUG_ON(rb_ptr == NULL);
-+
-+#if 0
-+ /* Checksum invalid? Ignore. */
-+ /* FIXME: Source route IP option packets --RR */
-+ if (tcp_v4_check(tcph, tcplen, iph->saddr, iph->daddr,
-+ csum_partial((char*)tcph, tcplen, 0)))
-+ {
-+ DEBUGP("bad csum: %p %u %u.%u.%u.%u %u.%u.%u.%u\n",
-+ tcph, tcplen, NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
-+ return NF_ACCEPT;
-+ }
-+#endif
-+
-+ switch (CTINFO2DIR(ctinfo)) {
-+ case IP_CT_DIR_ORIGINAL:
-+ ret = help_out(skb, rb_ptr, datalen, ct, ctinfo);
-+ break;
-+ case IP_CT_DIR_REPLY:
-+ DEBUGP("IP_CT_DIR_REPLY\n");
-+ /* inbound packet: server->client */
-+ ret = NF_ACCEPT;
-+ break;
-+ }
-+
-+ spin_unlock_bh(&rtsp_buffer_lock);
-+
-+ return ret;
-+}
-+
-+static struct nf_conntrack_helper rtsp_helpers[MAX_PORTS];
-+static char rtsp_names[MAX_PORTS][10];
-+static struct nf_conntrack_expect_policy rtsp_expect_policy;
-+
-+/* This function is intentionally _NOT_ defined as __exit */
-+static void
-+fini(void)
-+{
-+ int i;
-+ for (i = 0; i < num_ports; i++) {
-+ DEBUGP("unregistering port %d\n", ports[i]);
-+ nf_conntrack_helper_unregister(&rtsp_helpers[i]);
-+ }
-+ kfree(rtsp_buffer);
-+}
-+
-+static int __init
-+init(void)
-+{
-+ int i, ret;
-+ struct nf_conntrack_helper *hlpr;
-+ char *tmpname;
-+
-+ printk("nf_conntrack_rtsp v" IP_NF_RTSP_VERSION " loading\n");
-+
-+ if (max_outstanding < 1) {
-+ printk("nf_conntrack_rtsp: max_outstanding must be a positive integer\n");
-+ return -EBUSY;
-+ }
-+ if (setup_timeout < 0) {
-+ printk("nf_conntrack_rtsp: setup_timeout must be a positive integer\n");
-+ return -EBUSY;
-+ }
-+
-+ rtsp_expect_policy.max_expected = max_outstanding;
-+ rtsp_expect_policy.timeout = setup_timeout;
-+
-+ rtsp_buffer = kmalloc(65536, GFP_KERNEL);
-+ if (!rtsp_buffer)
-+ return -ENOMEM;
-+
-+ /* If no port given, default to standard rtsp port */
-+ if (ports[0] == 0) {
-+ ports[0] = RTSP_PORT;
-+ }
-+
-+ for (i = 0; (i < MAX_PORTS) && ports[i]; i++) {
-+ hlpr = &rtsp_helpers[i];
-+ memset(hlpr, 0, sizeof(struct nf_conntrack_helper));
-+ hlpr->tuple.src.u.tcp.port = htons(ports[i]);
-+ hlpr->tuple.dst.protonum = IPPROTO_TCP;
-+ hlpr->expect_policy = &rtsp_expect_policy;
-+ hlpr->me = THIS_MODULE;
-+ hlpr->help = help;
-+
-+ tmpname = &rtsp_names[i][0];
-+ if (ports[i] == RTSP_PORT) {
-+ sprintf(tmpname, "rtsp");
-+ } else {
-+ sprintf(tmpname, "rtsp-%d", i);
-+ }
-+ hlpr->name = tmpname;
-+
-+ DEBUGP("port #%d: %d\n", i, ports[i]);
-+
-+ ret = nf_conntrack_helper_register(hlpr);
-+
-+ if (ret) {
-+ printk("nf_conntrack_rtsp: ERROR registering port %d\n", ports[i]);
-+ fini();
-+ return -EBUSY;
-+ }
-+ num_ports++;
-+ }
-+ return 0;
-+}
-+
-+module_init(init);
-+module_exit(fini);
-+
-+EXPORT_SYMBOL(nf_nat_rtsp_hook_expectfn);
-+
---- /dev/null
-+++ b/net/ipv4/netfilter/nf_nat_rtsp.c
-@@ -0,0 +1,496 @@
-+/*
-+ * RTSP extension for TCP NAT alteration
-+ * (C) 2003 by Tom Marshall <tmarshall at real.com>
-+ * based on ip_nat_irc.c
-+ *
-+ * 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 nf_nat_rtsp.o ports=port1,port2,...port<MAX_PORTS>
-+ * stunaddr=<address>
-+ * destaction=[auto|strip|none]
-+ *
-+ * If no ports are specified, the default will be port 554 only.
-+ *
-+ * stunaddr specifies the address used to detect that a client is using STUN.
-+ * If this address is seen in the destination parameter, it is assumed that
-+ * the client has already punched a UDP hole in the firewall, so we don't
-+ * mangle the client_port. If none is specified, it is autodetected. It
-+ * only needs to be set if you have multiple levels of NAT. It should be
-+ * set to the external address that the STUN clients detect. Note that in
-+ * this case, it will not be possible for clients to use UDP with servers
-+ * between the NATs.
-+ *
-+ * If no destaction is specified, auto is used.
-+ * destaction=auto: strip destination parameter if it is not stunaddr.
-+ * destaction=strip: always strip destination parameter (not recommended).
-+ * destaction=none: do not touch destination parameter (not recommended).
-+ */
-+
-+#include <linux/module.h>
-+#include <net/tcp.h>
-+#include <net/netfilter/nf_nat_helper.h>
-+#include <net/netfilter/nf_nat_rule.h>
-+#include <linux/netfilter/nf_conntrack_rtsp.h>
-+#include <net/netfilter/nf_conntrack_expect.h>
-+
-+#include <linux/inet.h>
-+#include <linux/ctype.h>
-+#define NF_NEED_STRNCASECMP
-+#define NF_NEED_STRTOU16
-+#include <linux/netfilter_helpers.h>
-+#define NF_NEED_MIME_NEXTLINE
-+#include <linux/netfilter_mime.h>
-+
-+#define INFOP(fmt, args...) printk(KERN_INFO "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#if 0
-+#define DEBUGP(fmt, args...) printk(KERN_DEBUG "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#else
-+#define DEBUGP(fmt, args...)
-+#endif
-+
-+#define MAX_PORTS 8
-+#define DSTACT_AUTO 0
-+#define DSTACT_STRIP 1
-+#define DSTACT_NONE 2
-+
-+static char* stunaddr = NULL;
-+static char* destaction = NULL;
-+
-+static u_int32_t extip = 0;
-+static int dstact = 0;
-+
-+MODULE_AUTHOR("Tom Marshall <tmarshall at real.com>");
-+MODULE_DESCRIPTION("RTSP network address translation module");
-+MODULE_LICENSE("GPL");
-+module_param(stunaddr, charp, 0644);
-+MODULE_PARM_DESC(stunaddr, "Address for detecting STUN");
-+module_param(destaction, charp, 0644);
-+MODULE_PARM_DESC(destaction, "Action for destination parameter (auto/strip/none)");
-+
-+#define SKIP_WSPACE(ptr,len,off) while(off < len && isspace(*(ptr+off))) { off++; }
-+
-+/*** helper functions ***/
-+
-+static void
-+get_skb_tcpdata(struct sk_buff* skb, char** pptcpdata, uint* ptcpdatalen)
-+{
-+ struct iphdr* iph = ip_hdr(skb);
-+ struct tcphdr* tcph = (void *)iph + ip_hdrlen(skb);
-+
-+ *pptcpdata = (char*)tcph + tcph->doff*4;
-+ *ptcpdatalen = ((char*)skb_transport_header(skb) + skb->len) - *pptcpdata;
-+}
-+
-+/*** nat functions ***/
-+
-+/*
-+ * Mangle the "Transport:" header:
-+ * - Replace all occurences of "client_port=<spec>"
-+ * - Handle destination parameter
-+ *
-+ * In:
-+ * ct, ctinfo = conntrack context
-+ * skb = packet
-+ * tranoff = Transport header offset from TCP data
-+ * tranlen = Transport header length (incl. CRLF)
-+ * rport_lo = replacement low port (host endian)
-+ * rport_hi = replacement high port (host endian)
-+ *
-+ * Returns packet size difference.
-+ *
-+ * Assumes that a complete transport header is present, ending with CR or LF
-+ */
-+static int
-+rtsp_mangle_tran(enum ip_conntrack_info ctinfo,
-+ struct nf_conntrack_expect* exp,
-+ struct ip_ct_rtsp_expect* prtspexp,
-+ struct sk_buff* skb, uint tranoff, uint tranlen)
-+{
-+ char* ptcp;
-+ uint tcplen;
-+ char* ptran;
-+ char rbuf1[16]; /* Replacement buffer (one port) */
-+ uint rbuf1len; /* Replacement len (one port) */
-+ char rbufa[16]; /* Replacement buffer (all ports) */
-+ uint rbufalen; /* Replacement len (all ports) */
-+ u_int32_t newip;
-+ u_int16_t loport, hiport;
-+ uint off = 0;
-+ uint diff; /* Number of bytes we removed */
-+
-+ struct nf_conn *ct = exp->master;
-+ struct nf_conntrack_tuple *t;
-+
-+ char szextaddr[15+1];
-+ uint extaddrlen;
-+ int is_stun;
-+
-+ get_skb_tcpdata(skb, &ptcp, &tcplen);
-+ ptran = ptcp+tranoff;
-+
-+ if (tranoff+tranlen > tcplen || tcplen-tranoff < tranlen ||
-+ tranlen < 10 || !iseol(ptran[tranlen-1]) ||
-+ nf_strncasecmp(ptran, "Transport:", 10) != 0)
-+ {
-+ INFOP("sanity check failed\n");
-+ return 0;
-+ }
-+ off += 10;
-+ SKIP_WSPACE(ptcp+tranoff, tranlen, off);
-+
-+ newip = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip;
-+ t = &exp->tuple;
-+ t->dst.u3.ip = newip;
-+
-+ extaddrlen = extip ? sprintf(szextaddr, "%u.%u.%u.%u", NIPQUAD(extip))
-+ : sprintf(szextaddr, "%u.%u.%u.%u", NIPQUAD(newip));
-+ DEBUGP("stunaddr=%s (%s)\n", szextaddr, (extip?"forced":"auto"));
-+
-+ rbuf1len = rbufalen = 0;
-+ switch (prtspexp->pbtype)
-+ {
-+ case pb_single:
-+ for (loport = prtspexp->loport; loport != 0; loport++) /* XXX: improper wrap? */
-+ {
-+ t->dst.u.udp.port = htons(loport);
-+ if (nf_ct_expect_related(exp) == 0)
-+ {
-+ DEBUGP("using port %hu\n", loport);
-+ break;
-+ }
-+ }
-+ if (loport != 0)
-+ {
-+ rbuf1len = sprintf(rbuf1, "%hu", loport);
-+ rbufalen = sprintf(rbufa, "%hu", loport);
-+ }
-+ break;
-+ case pb_range:
-+ for (loport = prtspexp->loport; loport != 0; loport += 2) /* XXX: improper wrap? */
-+ {
-+ t->dst.u.udp.port = htons(loport);
-+ if (nf_ct_expect_related(exp) == 0)
-+ {
-+ hiport = loport + ~exp->mask.src.u.udp.port;
-+ DEBUGP("using ports %hu-%hu\n", loport, hiport);
-+ break;
-+ }
-+ }
-+ if (loport != 0)
-+ {
-+ rbuf1len = sprintf(rbuf1, "%hu", loport);
-+ rbufalen = sprintf(rbufa, "%hu-%hu", loport, loport+1);
-+ }
-+ break;
-+ case pb_discon:
-+ for (loport = prtspexp->loport; loport != 0; loport++) /* XXX: improper wrap? */
-+ {
-+ t->dst.u.udp.port = htons(loport);
-+ if (nf_ct_expect_related(exp) == 0)
-+ {
-+ DEBUGP("using port %hu (1 of 2)\n", loport);
-+ break;
-+ }
-+ }
-+ for (hiport = prtspexp->hiport; hiport != 0; hiport++) /* XXX: improper wrap? */
-+ {
-+ t->dst.u.udp.port = htons(hiport);
-+ if (nf_ct_expect_related(exp) == 0)
-+ {
-+ DEBUGP("using port %hu (2 of 2)\n", hiport);
-+ break;
-+ }
-+ }
-+ if (loport != 0 && hiport != 0)
-+ {
-+ rbuf1len = sprintf(rbuf1, "%hu", loport);
-+ if (hiport == loport+1)
-+ {
-+ rbufalen = sprintf(rbufa, "%hu-%hu", loport, hiport);
-+ }
-+ else
-+ {
-+ rbufalen = sprintf(rbufa, "%hu/%hu", loport, hiport);
-+ }
-+ }
-+ break;
-+ }
-+
-+ if (rbuf1len == 0)
-+ {
-+ return 0; /* cannot get replacement port(s) */
-+ }
-+
-+ /* Transport: tran;field;field=val,tran;field;field=val,... */
-+ while (off < tranlen)
-+ {
-+ uint saveoff;
-+ const char* pparamend;
-+ uint nextparamoff;
-+
-+ pparamend = memchr(ptran+off, ',', tranlen-off);
-+ pparamend = (pparamend == NULL) ? ptran+tranlen : pparamend+1;
-+ nextparamoff = pparamend-ptcp;
-+
-+ /*
-+ * We pass over each param twice. On the first pass, we look for a
-+ * destination= field. It is handled by the security policy. If it
-+ * is present, allowed, and equal to our external address, we assume
-+ * that STUN is being used and we leave the client_port= field alone.
-+ */
-+ is_stun = 0;
-+ saveoff = off;
-+ while (off < nextparamoff)
-+ {
-+ const char* pfieldend;
-+ uint nextfieldoff;
-+
-+ pfieldend = memchr(ptran+off, ';', nextparamoff-off);
-+ nextfieldoff = (pfieldend == NULL) ? nextparamoff : pfieldend-ptran+1;
-+
-+ if (dstact != DSTACT_NONE && strncmp(ptran+off, "destination=", 12) == 0)
-+ {
-+ if (strncmp(ptran+off+12, szextaddr, extaddrlen) == 0)
-+ {
-+ is_stun = 1;
-+ }
-+ if (dstact == DSTACT_STRIP || (dstact == DSTACT_AUTO && !is_stun))
-+ {
-+ diff = nextfieldoff-off;
-+ if (!nf_nat_mangle_tcp_packet(skb, ct, ctinfo,
-+ off, diff, NULL, 0))
-+ {
-+ /* mangle failed, all we can do is bail */
-+ nf_ct_unexpect_related(exp);
-+ return 0;
-+ }
-+ get_skb_tcpdata(skb, &ptcp, &tcplen);
-+ ptran = ptcp+tranoff;
-+ tranlen -= diff;
-+ nextparamoff -= diff;
-+ nextfieldoff -= diff;
-+ }
-+ }
-+
-+ off = nextfieldoff;
-+ }
-+ if (is_stun)
-+ {
-+ continue;
-+ }
-+ off = saveoff;
-+ while (off < nextparamoff)
-+ {
-+ const char* pfieldend;
-+ uint nextfieldoff;
-+
-+ pfieldend = memchr(ptran+off, ';', nextparamoff-off);
-+ nextfieldoff = (pfieldend == NULL) ? nextparamoff : pfieldend-ptran+1;
-+
-+ if (strncmp(ptran+off, "client_port=", 12) == 0)
-+ {
-+ u_int16_t port;
-+ uint numlen;
-+ uint origoff;
-+ uint origlen;
-+ char* rbuf = rbuf1;
-+ uint rbuflen = rbuf1len;
-+
-+ off += 12;
-+ origoff = (ptran-ptcp)+off;
-+ origlen = 0;
-+ numlen = nf_strtou16(ptran+off, &port);
-+ off += numlen;
-+ origlen += numlen;
-+ if (port != prtspexp->loport)
-+ {
-+ DEBUGP("multiple ports found, port %hu ignored\n", port);
-+ }
-+ else
-+ {
-+ if (ptran[off] == '-' || ptran[off] == '/')
-+ {
-+ off++;
-+ origlen++;
-+ numlen = nf_strtou16(ptran+off, &port);
-+ off += numlen;
-+ origlen += numlen;
-+ rbuf = rbufa;
-+ rbuflen = rbufalen;
-+ }
-+
-+ /*
-+ * note we cannot just memcpy() if the sizes are the same.
-+ * the mangle function does skb resizing, checks for a
-+ * cloned skb, and updates the checksums.
-+ *
-+ * parameter 4 below is offset from start of tcp data.
-+ */
-+ diff = origlen-rbuflen;
-+ if (!nf_nat_mangle_tcp_packet(skb, ct, ctinfo,
-+ origoff, origlen, rbuf, rbuflen))
-+ {
-+ /* mangle failed, all we can do is bail */
-+ nf_ct_unexpect_related(exp);
-+ return 0;
-+ }
-+ get_skb_tcpdata(skb, &ptcp, &tcplen);
-+ ptran = ptcp+tranoff;
-+ tranlen -= diff;
-+ nextparamoff -= diff;
-+ nextfieldoff -= diff;
-+ }
-+ }
-+
-+ off = nextfieldoff;
-+ }
-+
-+ off = nextparamoff;
-+ }
-+
-+ return 1;
-+}
-+
-+static uint
-+help_out(struct sk_buff *skb, enum ip_conntrack_info ctinfo,
-+ unsigned int matchoff, unsigned int matchlen, struct ip_ct_rtsp_expect* prtspexp,
-+ struct nf_conntrack_expect* exp)
-+{
-+ char* ptcp;
-+ uint tcplen;
-+ uint hdrsoff;
-+ uint hdrslen;
-+ uint lineoff;
-+ uint linelen;
-+ uint off;
-+
-+ //struct iphdr* iph = (struct iphdr*)skb->nh.iph;
-+ //struct tcphdr* tcph = (struct tcphdr*)((void*)iph + iph->ihl*4);
-+
-+ get_skb_tcpdata(skb, &ptcp, &tcplen);
-+ hdrsoff = matchoff;//exp->seq - ntohl(tcph->seq);
-+ hdrslen = matchlen;
-+ off = hdrsoff;
-+ DEBUGP("NAT rtsp help_out\n");
-+
-+ while (nf_mime_nextline(ptcp, hdrsoff+hdrslen, &off, &lineoff, &linelen))
-+ {
-+ if (linelen == 0)
-+ {
-+ break;
-+ }
-+ if (off > hdrsoff+hdrslen)
-+ {
-+ INFOP("!! overrun !!");
-+ break;
-+ }
-+ DEBUGP("hdr: len=%u, %.*s", linelen, (int)linelen, ptcp+lineoff);
-+
-+ if (nf_strncasecmp(ptcp+lineoff, "Transport:", 10) == 0)
-+ {
-+ uint oldtcplen = tcplen;
-+ DEBUGP("hdr: Transport\n");
-+ if (!rtsp_mangle_tran(ctinfo, exp, prtspexp, skb, lineoff, linelen))
-+ {
-+ DEBUGP("hdr: Transport mangle failed");
-+ break;
-+ }
-+ get_skb_tcpdata(skb, &ptcp, &tcplen);
-+ hdrslen -= (oldtcplen-tcplen);
-+ off -= (oldtcplen-tcplen);
-+ lineoff -= (oldtcplen-tcplen);
-+ linelen -= (oldtcplen-tcplen);
-+ DEBUGP("rep: len=%u, %.*s", linelen, (int)linelen, ptcp+lineoff);
-+ }
-+ }
-+
-+ return NF_ACCEPT;
-+}
-+
-+static unsigned int
-+help(struct sk_buff *skb, enum ip_conntrack_info ctinfo,
-+ unsigned int matchoff, unsigned int matchlen, struct ip_ct_rtsp_expect* prtspexp,
-+ struct nf_conntrack_expect* exp)
-+{
-+ int dir = CTINFO2DIR(ctinfo);
-+ int rc = NF_ACCEPT;
-+
-+ switch (dir)
-+ {
-+ case IP_CT_DIR_ORIGINAL:
-+ rc = help_out(skb, ctinfo, matchoff, matchlen, prtspexp, exp);
-+ break;
-+ case IP_CT_DIR_REPLY:
-+ DEBUGP("unmangle ! %u\n", ctinfo);
-+ /* XXX: unmangle */
-+ rc = NF_ACCEPT;
-+ break;
-+ }
-+ //UNLOCK_BH(&ip_rtsp_lock);
-+
-+ return rc;
-+}
-+
-+static void expected(struct nf_conn* ct, struct nf_conntrack_expect *exp)
-+{
-+ struct nf_nat_multi_range_compat mr;
-+ u_int32_t newdstip, newsrcip, newip;
-+
-+ struct nf_conn *master = ct->master;
-+
-+ newdstip = master->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip;
-+ newsrcip = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip;
-+ //FIXME (how to port that ?)
-+ //code from 2.4 : newip = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC) ? newsrcip : newdstip;
-+ newip = newdstip;
-+
-+ DEBUGP("newsrcip=%u.%u.%u.%u, newdstip=%u.%u.%u.%u, newip=%u.%u.%u.%u\n",
-+ NIPQUAD(newsrcip), NIPQUAD(newdstip), NIPQUAD(newip));
-+
-+ mr.rangesize = 1;
-+ // We don't want to manip the per-protocol, just the IPs.
-+ mr.range[0].flags = IP_NAT_RANGE_MAP_IPS;
-+ mr.range[0].min_ip = mr.range[0].max_ip = newip;
-+
-+ nf_nat_setup_info(ct, &mr.range[0], IP_NAT_MANIP_DST);
-+}
-+
-+
-+static void __exit fini(void)
-+{
-+ nf_nat_rtsp_hook = NULL;
-+ nf_nat_rtsp_hook_expectfn = NULL;
-+ synchronize_net();
-+}
-+
-+static int __init init(void)
-+{
-+ printk("nf_nat_rtsp v" IP_NF_RTSP_VERSION " loading\n");
-+
-+ BUG_ON(nf_nat_rtsp_hook);
-+ nf_nat_rtsp_hook = help;
-+ nf_nat_rtsp_hook_expectfn = &expected;
-+
-+ if (stunaddr != NULL)
-+ extip = in_aton(stunaddr);
-+
-+ if (destaction != NULL) {
-+ if (strcmp(destaction, "auto") == 0)
-+ dstact = DSTACT_AUTO;
-+
-+ if (strcmp(destaction, "strip") == 0)
-+ dstact = DSTACT_STRIP;
-+
-+ if (strcmp(destaction, "none") == 0)
-+ dstact = DSTACT_NONE;
-+ }
-+
-+ return 0;
-+}
-+
-+module_init(init);
-+module_exit(fini);
+++ /dev/null
---- /dev/null
-+++ b/include/linux/netfilter/nf_conntrack_rtsp.h
-@@ -0,0 +1,63 @@
-+/*
-+ * RTSP extension for IP connection tracking.
-+ * (C) 2003 by Tom Marshall <tmarshall at real.com>
-+ * based on ip_conntrack_irc.h
-+ *
-+ * 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_RTSP_H
-+#define _IP_CONNTRACK_RTSP_H
-+
-+//#define IP_NF_RTSP_DEBUG 1
-+#define IP_NF_RTSP_VERSION "0.6.21"
-+
-+#ifdef __KERNEL__
-+/* port block types */
-+typedef enum {
-+ pb_single, /* client_port=x */
-+ pb_range, /* client_port=x-y */
-+ pb_discon /* client_port=x/y (rtspbis) */
-+} portblock_t;
-+
-+/* We record seq number and length of rtsp headers here, all in host order. */
-+
-+/*
-+ * This structure is per expected connection. It is a member of struct
-+ * ip_conntrack_expect. The TCP SEQ for the conntrack expect is stored
-+ * there and we are expected to only store the length of the data which
-+ * needs replaced. If a packet contains multiple RTSP messages, we create
-+ * one expected connection per message.
-+ *
-+ * We use these variables to mark the entire header block. This may seem
-+ * like overkill, but the nature of RTSP requires it. A header may appear
-+ * multiple times in a message. We must treat two Transport headers the
-+ * same as one Transport header with two entries.
-+ */
-+struct ip_ct_rtsp_expect
-+{
-+ u_int32_t len; /* length of header block */
-+ portblock_t pbtype; /* Type of port block that was requested */
-+ u_int16_t loport; /* Port that was requested, low or first */
-+ u_int16_t hiport; /* Port that was requested, high or second */
-+#if 0
-+ uint method; /* RTSP method */
-+ uint cseq; /* CSeq from request */
-+#endif
-+};
-+
-+extern unsigned int (*nf_nat_rtsp_hook)(struct sk_buff *skb,
-+ enum ip_conntrack_info ctinfo,
-+ unsigned int matchoff, unsigned int matchlen,
-+ struct ip_ct_rtsp_expect *prtspexp,
-+ struct nf_conntrack_expect *exp);
-+
-+extern void (*nf_nat_rtsp_hook_expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
-+
-+#define RTSP_PORT 554
-+
-+#endif /* __KERNEL__ */
-+
-+#endif /* _IP_CONNTRACK_RTSP_H */
---- /dev/null
-+++ b/include/linux/netfilter_helpers.h
-@@ -0,0 +1,133 @@
-+/*
-+ * Helpers for netfiler modules. This file provides implementations for basic
-+ * functions such as strncasecmp(), etc.
-+ *
-+ * gcc will warn for defined but unused functions, so we only include the
-+ * functions requested. The following macros are used:
-+ * NF_NEED_STRNCASECMP nf_strncasecmp()
-+ * NF_NEED_STRTOU16 nf_strtou16()
-+ * NF_NEED_STRTOU32 nf_strtou32()
-+ */
-+#ifndef _NETFILTER_HELPERS_H
-+#define _NETFILTER_HELPERS_H
-+
-+/* Only include these functions for kernel code. */
-+#ifdef __KERNEL__
-+
-+#include <linux/ctype.h>
-+#define iseol(c) ( (c) == '\r' || (c) == '\n' )
-+
-+/*
-+ * The standard strncasecmp()
-+ */
-+#ifdef NF_NEED_STRNCASECMP
-+static int
-+nf_strncasecmp(const char* s1, const char* s2, u_int32_t len)
-+{
-+ if (s1 == NULL || s2 == NULL)
-+ {
-+ if (s1 == NULL && s2 == NULL)
-+ {
-+ return 0;
-+ }
-+ return (s1 == NULL) ? -1 : 1;
-+ }
-+ while (len > 0 && tolower(*s1) == tolower(*s2))
-+ {
-+ len--;
-+ s1++;
-+ s2++;
-+ }
-+ return ( (len == 0) ? 0 : (tolower(*s1) - tolower(*s2)) );
-+}
-+#endif /* NF_NEED_STRNCASECMP */
-+
-+/*
-+ * Parse a string containing a 16-bit unsigned integer.
-+ * Returns the number of chars used, or zero if no number is found.
-+ */
-+#ifdef NF_NEED_STRTOU16
-+static int
-+nf_strtou16(const char* pbuf, u_int16_t* pval)
-+{
-+ int n = 0;
-+
-+ *pval = 0;
-+ while (isdigit(pbuf[n]))
-+ {
-+ *pval = (*pval * 10) + (pbuf[n] - '0');
-+ n++;
-+ }
-+
-+ return n;
-+}
-+#endif /* NF_NEED_STRTOU16 */
-+
-+/*
-+ * Parse a string containing a 32-bit unsigned integer.
-+ * Returns the number of chars used, or zero if no number is found.
-+ */
-+#ifdef NF_NEED_STRTOU32
-+static int
-+nf_strtou32(const char* pbuf, u_int32_t* pval)
-+{
-+ int n = 0;
-+
-+ *pval = 0;
-+ while (pbuf[n] >= '0' && pbuf[n] <= '9')
-+ {
-+ *pval = (*pval * 10) + (pbuf[n] - '0');
-+ n++;
-+ }
-+
-+ return n;
-+}
-+#endif /* NF_NEED_STRTOU32 */
-+
-+/*
-+ * Given a buffer and length, advance to the next line and mark the current
-+ * line.
-+ */
-+#ifdef NF_NEED_NEXTLINE
-+static int
-+nf_nextline(char* p, uint len, uint* poff, uint* plineoff, uint* plinelen)
-+{
-+ uint off = *poff;
-+ uint physlen = 0;
-+
-+ if (off >= len)
-+ {
-+ return 0;
-+ }
-+
-+ while (p[off] != '\n')
-+ {
-+ if (len-off <= 1)
-+ {
-+ return 0;
-+ }
-+
-+ physlen++;
-+ off++;
-+ }
-+
-+ /* if we saw a crlf, physlen needs adjusted */
-+ if (physlen > 0 && p[off] == '\n' && p[off-1] == '\r')
-+ {
-+ physlen--;
-+ }
-+
-+ /* advance past the newline */
-+ off++;
-+
-+ *plineoff = *poff;
-+ *plinelen = physlen;
-+ *poff = off;
-+
-+ return 1;
-+}
-+#endif /* NF_NEED_NEXTLINE */
-+
-+#endif /* __KERNEL__ */
-+
-+#endif /* _NETFILTER_HELPERS_H */
---- /dev/null
-+++ b/include/linux/netfilter_mime.h
-@@ -0,0 +1,89 @@
-+/*
-+ * MIME functions for netfilter modules. This file provides implementations
-+ * for basic MIME parsing. MIME headers are used in many protocols, such as
-+ * HTTP, RTSP, SIP, etc.
-+ *
-+ * gcc will warn for defined but unused functions, so we only include the
-+ * functions requested. The following macros are used:
-+ * NF_NEED_MIME_NEXTLINE nf_mime_nextline()
-+ */
-+#ifndef _NETFILTER_MIME_H
-+#define _NETFILTER_MIME_H
-+
-+/* Only include these functions for kernel code. */
-+#ifdef __KERNEL__
-+
-+#include <linux/ctype.h>
-+
-+/*
-+ * Given a buffer and length, advance to the next line and mark the current
-+ * line. If the current line is empty, *plinelen will be set to zero. If
-+ * not, it will be set to the actual line length (including CRLF).
-+ *
-+ * 'line' in this context means logical line (includes LWS continuations).
-+ * Returns 1 on success, 0 on failure.
-+ */
-+#ifdef NF_NEED_MIME_NEXTLINE
-+static int
-+nf_mime_nextline(char* p, uint len, uint* poff, uint* plineoff, uint* plinelen)
-+{
-+ uint off = *poff;
-+ uint physlen = 0;
-+ int is_first_line = 1;
-+
-+ if (off >= len)
-+ {
-+ return 0;
-+ }
-+
-+ do
-+ {
-+ while (p[off] != '\n')
-+ {
-+ if (len-off <= 1)
-+ {
-+ return 0;
-+ }
-+
-+ physlen++;
-+ off++;
-+ }
-+
-+ /* if we saw a crlf, physlen needs adjusted */
-+ if (physlen > 0 && p[off] == '\n' && p[off-1] == '\r')
-+ {
-+ physlen--;
-+ }
-+
-+ /* advance past the newline */
-+ off++;
-+
-+ /* check for an empty line */
-+ if (physlen == 0)
-+ {
-+ break;
-+ }
-+
-+ /* check for colon on the first physical line */
-+ if (is_first_line)
-+ {
-+ is_first_line = 0;
-+ if (memchr(p+(*poff), ':', physlen) == NULL)
-+ {
-+ return 0;
-+ }
-+ }
-+ }
-+ while (p[off] == ' ' || p[off] == '\t');
-+
-+ *plineoff = *poff;
-+ *plinelen = (physlen == 0) ? 0 : (off - *poff);
-+ *poff = off;
-+
-+ return 1;
-+}
-+#endif /* NF_NEED_MIME_NEXTLINE */
-+
-+#endif /* __KERNEL__ */
-+
-+#endif /* _NETFILTER_MIME_H */
---- a/net/ipv4/netfilter/Makefile
-+++ b/net/ipv4/netfilter/Makefile
-@@ -26,6 +26,7 @@ obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_am
- obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
- obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323.o
- obj-$(CONFIG_NF_NAT_IRC) += nf_nat_irc.o
-+obj-$(CONFIG_NF_NAT_RTSP) += nf_nat_rtsp.o
- obj-$(CONFIG_NF_NAT_PPTP) += nf_nat_pptp.o
- obj-$(CONFIG_NF_NAT_SIP) += nf_nat_sip.o
- obj-$(CONFIG_NF_NAT_SNMP_BASIC) += nf_nat_snmp_basic.o
---- a/net/netfilter/Kconfig
-+++ b/net/netfilter/Kconfig
-@@ -267,6 +267,16 @@ config NF_CONNTRACK_TFTP
-
- To compile it as a module, choose M here. If unsure, say N.
-
-+config NF_CONNTRACK_RTSP
-+ tristate "RTSP protocol support"
-+ depends on NF_CONNTRACK
-+ help
-+ Support the RTSP protocol. This allows UDP transports to be setup
-+ properly, including RTP and RDT.
-+
-+ If you want to compile it as a module, say 'M' here and read
-+ Documentation/modules.txt. If unsure, say 'Y'.
-+
- config NF_CT_NETLINK
- tristate 'Connection tracking netlink interface'
- select NETFILTER_NETLINK
---- a/net/netfilter/Makefile
-+++ b/net/netfilter/Makefile
-@@ -33,6 +33,7 @@ obj-$(CONFIG_NF_CONNTRACK_PPTP) += nf_co
- obj-$(CONFIG_NF_CONNTRACK_SANE) += nf_conntrack_sane.o
- obj-$(CONFIG_NF_CONNTRACK_SIP) += nf_conntrack_sip.o
- obj-$(CONFIG_NF_CONNTRACK_TFTP) += nf_conntrack_tftp.o
-+obj-$(CONFIG_NF_CONNTRACK_RTSP) += nf_conntrack_rtsp.o
-
- # transparent proxy support
- obj-$(CONFIG_NETFILTER_TPROXY) += nf_tproxy_core.o
---- a/net/ipv4/netfilter/Kconfig
-+++ b/net/ipv4/netfilter/Kconfig
-@@ -257,6 +257,11 @@ config NF_NAT_IRC
- depends on NF_CONNTRACK && NF_NAT
- default NF_NAT && NF_CONNTRACK_IRC
-
-+config NF_NAT_RTSP
-+ tristate
-+ depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
-+ default NF_NAT && NF_CONNTRACK_RTSP
-+
- config NF_NAT_TFTP
- tristate
- depends on NF_CONNTRACK && NF_NAT
---- /dev/null
-+++ b/net/netfilter/nf_conntrack_rtsp.c
-@@ -0,0 +1,517 @@
-+/*
-+ * RTSP extension for IP connection tracking
-+ * (C) 2003 by Tom Marshall <tmarshall at real.com>
-+ * based on ip_conntrack_irc.c
-+ *
-+ * 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 nf_conntrack_rtsp.o ports=port1,port2,...port<MAX_PORTS>
-+ * max_outstanding=n setup_timeout=secs
-+ *
-+ * If no ports are specified, the default will be port 554.
-+ *
-+ * With max_outstanding you can define the maximum number of not yet
-+ * answered SETUP requests per RTSP session (default 8).
-+ * With setup_timeout you can specify how long the system waits for
-+ * an expected data channel (default 300 seconds).
-+ *
-+ * 2005-02-13: Harald Welte <laforge at netfilter.org>
-+ * - port to 2.6
-+ * - update to recent post-2.6.11 api changes
-+ * 2006-09-14: Steven Van Acker <deepstar at singularity.be>
-+ * - removed calls to NAT code from conntrack helper: NAT no longer needed to use rtsp-conntrack
-+ * 2007-04-18: Michael Guntsche <mike at it-loops.com>
-+ * - Port to new NF API
-+ */
-+
-+#include <linux/module.h>
-+#include <linux/netfilter.h>
-+#include <linux/ip.h>
-+#include <linux/inet.h>
-+#include <net/tcp.h>
-+
-+#include <net/netfilter/nf_conntrack.h>
-+#include <net/netfilter/nf_conntrack_expect.h>
-+#include <net/netfilter/nf_conntrack_helper.h>
-+#include <linux/netfilter/nf_conntrack_rtsp.h>
-+
-+#define NF_NEED_STRNCASECMP
-+#define NF_NEED_STRTOU16
-+#define NF_NEED_STRTOU32
-+#define NF_NEED_NEXTLINE
-+#include <linux/netfilter_helpers.h>
-+#define NF_NEED_MIME_NEXTLINE
-+#include <linux/netfilter_mime.h>
-+
-+#include <linux/ctype.h>
-+#define MAX_SIMUL_SETUP 8 /* XXX: use max_outstanding */
-+#define INFOP(fmt, args...) printk(KERN_INFO "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#if 0
-+#define DEBUGP(fmt, args...) printk(KERN_DEBUG "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#else
-+#define DEBUGP(fmt, args...)
-+#endif
-+
-+#define MAX_PORTS 8
-+static int ports[MAX_PORTS];
-+static int num_ports = 0;
-+static int max_outstanding = 8;
-+static unsigned int setup_timeout = 300;
-+
-+MODULE_AUTHOR("Tom Marshall <tmarshall at real.com>");
-+MODULE_DESCRIPTION("RTSP connection tracking module");
-+MODULE_LICENSE("GPL");
-+module_param_array(ports, int, &num_ports, 0400);
-+MODULE_PARM_DESC(ports, "port numbers of RTSP servers");
-+module_param(max_outstanding, int, 0400);
-+MODULE_PARM_DESC(max_outstanding, "max number of outstanding SETUP requests per RTSP session");
-+module_param(setup_timeout, int, 0400);
-+MODULE_PARM_DESC(setup_timeout, "timeout on for unestablished data channels");
-+
-+static char *rtsp_buffer;
-+static DEFINE_SPINLOCK(rtsp_buffer_lock);
-+
-+unsigned int (*nf_nat_rtsp_hook)(struct sk_buff *skb,
-+ enum ip_conntrack_info ctinfo,
-+ unsigned int matchoff, unsigned int matchlen,struct ip_ct_rtsp_expect* prtspexp,
-+ struct nf_conntrack_expect *exp);
-+void (*nf_nat_rtsp_hook_expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
-+
-+EXPORT_SYMBOL_GPL(nf_nat_rtsp_hook);
-+
-+/*
-+ * Max mappings we will allow for one RTSP connection (for RTP, the number
-+ * of allocated ports is twice this value). Note that SMIL burns a lot of
-+ * ports so keep this reasonably high. If this is too low, you will see a
-+ * lot of "no free client map entries" messages.
-+ */
-+#define MAX_PORT_MAPS 16
-+
-+/*** default port list was here in the masq code: 554, 3030, 4040 ***/
-+
-+#define SKIP_WSPACE(ptr,len,off) while(off < len && isspace(*(ptr+off))) { off++; }
-+
-+/*
-+ * Parse an RTSP packet.
-+ *
-+ * Returns zero if parsing failed.
-+ *
-+ * Parameters:
-+ * IN ptcp tcp data pointer
-+ * IN tcplen tcp data len
-+ * IN/OUT ptcpoff points to current tcp offset
-+ * OUT phdrsoff set to offset of rtsp headers
-+ * OUT phdrslen set to length of rtsp headers
-+ * OUT pcseqoff set to offset of CSeq header
-+ * OUT pcseqlen set to length of CSeq header
-+ */
-+static int
-+rtsp_parse_message(char* ptcp, uint tcplen, uint* ptcpoff,
-+ uint* phdrsoff, uint* phdrslen,
-+ uint* pcseqoff, uint* pcseqlen,
-+ uint* transoff, uint* translen)
-+{
-+ uint entitylen = 0;
-+ uint lineoff;
-+ uint linelen;
-+
-+ if (!nf_nextline(ptcp, tcplen, ptcpoff, &lineoff, &linelen))
-+ return 0;
-+
-+ *phdrsoff = *ptcpoff;
-+ while (nf_mime_nextline(ptcp, tcplen, ptcpoff, &lineoff, &linelen)) {
-+ if (linelen == 0) {
-+ if (entitylen > 0)
-+ *ptcpoff += min(entitylen, tcplen - *ptcpoff);
-+ break;
-+ }
-+ if (lineoff+linelen > tcplen) {
-+ INFOP("!! overrun !!\n");
-+ break;
-+ }
-+
-+ if (nf_strncasecmp(ptcp+lineoff, "CSeq:", 5) == 0) {
-+ *pcseqoff = lineoff;
-+ *pcseqlen = linelen;
-+ }
-+
-+ if (nf_strncasecmp(ptcp+lineoff, "Transport:", 10) == 0) {
-+ *transoff = lineoff;
-+ *translen = linelen;
-+ }
-+
-+ if (nf_strncasecmp(ptcp+lineoff, "Content-Length:", 15) == 0) {
-+ uint off = lineoff+15;
-+ SKIP_WSPACE(ptcp+lineoff, linelen, off);
-+ nf_strtou32(ptcp+off, &entitylen);
-+ }
-+ }
-+ *phdrslen = (*ptcpoff) - (*phdrsoff);
-+
-+ return 1;
-+}
-+
-+/*
-+ * Find lo/hi client ports (if any) in transport header
-+ * In:
-+ * ptcp, tcplen = packet
-+ * tranoff, tranlen = buffer to search
-+ *
-+ * Out:
-+ * pport_lo, pport_hi = lo/hi ports (host endian)
-+ *
-+ * Returns nonzero if any client ports found
-+ *
-+ * Note: it is valid (and expected) for the client to request multiple
-+ * transports, so we need to parse the entire line.
-+ */
-+static int
-+rtsp_parse_transport(char* ptran, uint tranlen,
-+ struct ip_ct_rtsp_expect* prtspexp)
-+{
-+ int rc = 0;
-+ uint off = 0;
-+
-+ if (tranlen < 10 || !iseol(ptran[tranlen-1]) ||
-+ nf_strncasecmp(ptran, "Transport:", 10) != 0) {
-+ INFOP("sanity check failed\n");
-+ return 0;
-+ }
-+
-+ DEBUGP("tran='%.*s'\n", (int)tranlen, ptran);
-+ off += 10;
-+ SKIP_WSPACE(ptran, tranlen, off);
-+
-+ /* Transport: tran;field;field=val,tran;field;field=val,... */
-+ while (off < tranlen) {
-+ const char* pparamend;
-+ uint nextparamoff;
-+
-+ pparamend = memchr(ptran+off, ',', tranlen-off);
-+ pparamend = (pparamend == NULL) ? ptran+tranlen : pparamend+1;
-+ nextparamoff = pparamend-ptran;
-+
-+ while (off < nextparamoff) {
-+ const char* pfieldend;
-+ uint nextfieldoff;
-+
-+ pfieldend = memchr(ptran+off, ';', nextparamoff-off);
-+ nextfieldoff = (pfieldend == NULL) ? nextparamoff : pfieldend-ptran+1;
-+
-+ if (strncmp(ptran+off, "client_port=", 12) == 0) {
-+ u_int16_t port;
-+ uint numlen;
-+
-+ off += 12;
-+ numlen = nf_strtou16(ptran+off, &port);
-+ off += numlen;
-+ if (prtspexp->loport != 0 && prtspexp->loport != port)
-+ DEBUGP("multiple ports found, port %hu ignored\n", port);
-+ else {
-+ DEBUGP("lo port found : %hu\n", port);
-+ prtspexp->loport = prtspexp->hiport = port;
-+ if (ptran[off] == '-') {
-+ off++;
-+ numlen = nf_strtou16(ptran+off, &port);
-+ off += numlen;
-+ prtspexp->pbtype = pb_range;
-+ prtspexp->hiport = port;
-+
-+ // If we have a range, assume rtp:
-+ // loport must be even, hiport must be loport+1
-+ if ((prtspexp->loport & 0x0001) != 0 ||
-+ prtspexp->hiport != prtspexp->loport+1) {
-+ DEBUGP("incorrect range: %hu-%hu, correcting\n",
-+ prtspexp->loport, prtspexp->hiport);
-+ prtspexp->loport &= 0xfffe;
-+ prtspexp->hiport = prtspexp->loport+1;
-+ }
-+ } else if (ptran[off] == '/') {
-+ off++;
-+ numlen = nf_strtou16(ptran+off, &port);
-+ off += numlen;
-+ prtspexp->pbtype = pb_discon;
-+ prtspexp->hiport = port;
-+ }
-+ rc = 1;
-+ }
-+ }
-+
-+ /*
-+ * Note we don't look for the destination parameter here.
-+ * If we are using NAT, the NAT module will handle it. If not,
-+ * and the client is sending packets elsewhere, the expectation
-+ * will quietly time out.
-+ */
-+
-+ off = nextfieldoff;
-+ }
-+
-+ off = nextparamoff;
-+ }
-+
-+ return rc;
-+}
-+
-+void expected(struct nf_conn *ct, struct nf_conntrack_expect *exp)
-+{
-+ if(nf_nat_rtsp_hook_expectfn) {
-+ nf_nat_rtsp_hook_expectfn(ct,exp);
-+ }
-+}
-+
-+/*** conntrack functions ***/
-+
-+/* outbound packet: client->server */
-+
-+static inline int
-+help_out(struct sk_buff *skb, unsigned char *rb_ptr, unsigned int datalen,
-+ struct nf_conn *ct, enum ip_conntrack_info ctinfo)
-+{
-+ struct ip_ct_rtsp_expect expinfo;
-+
-+ int dir = CTINFO2DIR(ctinfo); /* = IP_CT_DIR_ORIGINAL */
-+ //struct tcphdr* tcph = (void*)iph + iph->ihl * 4;
-+ //uint tcplen = pktlen - iph->ihl * 4;
-+ char* pdata = rb_ptr;
-+ //uint datalen = tcplen - tcph->doff * 4;
-+ uint dataoff = 0;
-+ int ret = NF_ACCEPT;
-+
-+ struct nf_conntrack_expect *exp;
-+
-+ __be16 be_loport;
-+
-+ memset(&expinfo, 0, sizeof(expinfo));
-+
-+ while (dataoff < datalen) {
-+ uint cmdoff = dataoff;
-+ uint hdrsoff = 0;
-+ uint hdrslen = 0;
-+ uint cseqoff = 0;
-+ uint cseqlen = 0;
-+ uint transoff = 0;
-+ uint translen = 0;
-+ uint off;
-+
-+ if (!rtsp_parse_message(pdata, datalen, &dataoff,
-+ &hdrsoff, &hdrslen,
-+ &cseqoff, &cseqlen,
-+ &transoff, &translen))
-+ break; /* not a valid message */
-+
-+ if (strncmp(pdata+cmdoff, "SETUP ", 6) != 0)
-+ continue; /* not a SETUP message */
-+ DEBUGP("found a setup message\n");
-+
-+ off = 0;
-+ if(translen) {
-+ rtsp_parse_transport(pdata+transoff, translen, &expinfo);
-+ }
-+
-+ if (expinfo.loport == 0) {
-+ DEBUGP("no udp transports found\n");
-+ continue; /* no udp transports found */
-+ }
-+
-+ DEBUGP("udp transport found, ports=(%d,%hu,%hu)\n",
-+ (int)expinfo.pbtype, expinfo.loport, expinfo.hiport);
-+
-+ exp = nf_ct_expect_alloc(ct);
-+ if (!exp) {
-+ ret = NF_DROP;
-+ goto out;
-+ }
-+
-+ be_loport = htons(expinfo.loport);
-+
-+ nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT,
-+ ct->tuplehash[!dir].tuple.src.l3num,
-+ &ct->tuplehash[!dir].tuple.src.u3, &ct->tuplehash[!dir].tuple.dst.u3,
-+ IPPROTO_UDP, NULL, &be_loport);
-+
-+ exp->master = ct;
-+
-+ exp->expectfn = expected;
-+ exp->flags = 0;
-+
-+ if (expinfo.pbtype == pb_range) {
-+ DEBUGP("Changing expectation mask to handle multiple ports\n");
-+ exp->mask.src.u.udp.port = 0xfffe;
-+ }
-+
-+ DEBUGP("expect_related %u.%u.%u.%u:%u-%u.%u.%u.%u:%u\n",
-+ NIPQUAD(exp->tuple.src.u3.ip),
-+ ntohs(exp->tuple.src.u.udp.port),
-+ NIPQUAD(exp->tuple.dst.u3.ip),
-+ ntohs(exp->tuple.dst.u.udp.port));
-+
-+ if (nf_nat_rtsp_hook)
-+ /* pass the request off to the nat helper */
-+ ret = nf_nat_rtsp_hook(skb, ctinfo, hdrsoff, hdrslen, &expinfo, exp);
-+ else if (nf_ct_expect_related(exp) != 0) {
-+ INFOP("nf_ct_expect_related failed\n");
-+ ret = NF_DROP;
-+ }
-+ nf_ct_expect_put(exp);
-+ goto out;
-+ }
-+out:
-+
-+ return ret;
-+}
-+
-+
-+static inline int
-+help_in(struct sk_buff *skb, size_t pktlen,
-+ struct nf_conn* ct, enum ip_conntrack_info ctinfo)
-+{
-+ return NF_ACCEPT;
-+}
-+
-+static int help(struct sk_buff *skb, unsigned int protoff,
-+ struct nf_conn *ct, enum ip_conntrack_info ctinfo)
-+{
-+ struct tcphdr _tcph, *th;
-+ unsigned int dataoff, datalen;
-+ char *rb_ptr;
-+ int ret = NF_DROP;
-+
-+ /* 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 whole TCP header? */
-+ th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
-+
-+ if (!th)
-+ return NF_ACCEPT;
-+
-+ /* No data ? */
-+ dataoff = protoff + th->doff*4;
-+ datalen = skb->len - dataoff;
-+ if (dataoff >= skb->len)
-+ return NF_ACCEPT;
-+
-+ spin_lock_bh(&rtsp_buffer_lock);
-+ rb_ptr = skb_header_pointer(skb, dataoff,
-+ skb->len - dataoff, rtsp_buffer);
-+ BUG_ON(rb_ptr == NULL);
-+
-+#if 0
-+ /* Checksum invalid? Ignore. */
-+ /* FIXME: Source route IP option packets --RR */
-+ if (tcp_v4_check(tcph, tcplen, iph->saddr, iph->daddr,
-+ csum_partial((char*)tcph, tcplen, 0)))
-+ {
-+ DEBUGP("bad csum: %p %u %u.%u.%u.%u %u.%u.%u.%u\n",
-+ tcph, tcplen, NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
-+ return NF_ACCEPT;
-+ }
-+#endif
-+
-+ switch (CTINFO2DIR(ctinfo)) {
-+ case IP_CT_DIR_ORIGINAL:
-+ ret = help_out(skb, rb_ptr, datalen, ct, ctinfo);
-+ break;
-+ case IP_CT_DIR_REPLY:
-+ DEBUGP("IP_CT_DIR_REPLY\n");
-+ /* inbound packet: server->client */
-+ ret = NF_ACCEPT;
-+ break;
-+ }
-+
-+ spin_unlock_bh(&rtsp_buffer_lock);
-+
-+ return ret;
-+}
-+
-+static struct nf_conntrack_helper rtsp_helpers[MAX_PORTS];
-+static char rtsp_names[MAX_PORTS][10];
-+static struct nf_conntrack_expect_policy rtsp_expect_policy;
-+
-+/* This function is intentionally _NOT_ defined as __exit */
-+static void
-+fini(void)
-+{
-+ int i;
-+ for (i = 0; i < num_ports; i++) {
-+ DEBUGP("unregistering port %d\n", ports[i]);
-+ nf_conntrack_helper_unregister(&rtsp_helpers[i]);
-+ }
-+ kfree(rtsp_buffer);
-+}
-+
-+static int __init
-+init(void)
-+{
-+ int i, ret;
-+ struct nf_conntrack_helper *hlpr;
-+ char *tmpname;
-+
-+ printk("nf_conntrack_rtsp v" IP_NF_RTSP_VERSION " loading\n");
-+
-+ if (max_outstanding < 1) {
-+ printk("nf_conntrack_rtsp: max_outstanding must be a positive integer\n");
-+ return -EBUSY;
-+ }
-+ if (setup_timeout < 0) {
-+ printk("nf_conntrack_rtsp: setup_timeout must be a positive integer\n");
-+ return -EBUSY;
-+ }
-+
-+ rtsp_expect_policy.max_expected = max_outstanding;
-+ rtsp_expect_policy.timeout = setup_timeout;
-+
-+ rtsp_buffer = kmalloc(65536, GFP_KERNEL);
-+ if (!rtsp_buffer)
-+ return -ENOMEM;
-+
-+ /* If no port given, default to standard rtsp port */
-+ if (ports[0] == 0) {
-+ ports[0] = RTSP_PORT;
-+ }
-+
-+ for (i = 0; (i < MAX_PORTS) && ports[i]; i++) {
-+ hlpr = &rtsp_helpers[i];
-+ memset(hlpr, 0, sizeof(struct nf_conntrack_helper));
-+ hlpr->tuple.src.u.tcp.port = htons(ports[i]);
-+ hlpr->tuple.dst.protonum = IPPROTO_TCP;
-+ hlpr->expect_policy = &rtsp_expect_policy;
-+ hlpr->me = THIS_MODULE;
-+ hlpr->help = help;
-+
-+ tmpname = &rtsp_names[i][0];
-+ if (ports[i] == RTSP_PORT) {
-+ sprintf(tmpname, "rtsp");
-+ } else {
-+ sprintf(tmpname, "rtsp-%d", i);
-+ }
-+ hlpr->name = tmpname;
-+
-+ DEBUGP("port #%d: %d\n", i, ports[i]);
-+
-+ ret = nf_conntrack_helper_register(hlpr);
-+
-+ if (ret) {
-+ printk("nf_conntrack_rtsp: ERROR registering port %d\n", ports[i]);
-+ fini();
-+ return -EBUSY;
-+ }
-+ num_ports++;
-+ }
-+ return 0;
-+}
-+
-+module_init(init);
-+module_exit(fini);
-+
-+EXPORT_SYMBOL(nf_nat_rtsp_hook_expectfn);
-+
---- /dev/null
-+++ b/net/ipv4/netfilter/nf_nat_rtsp.c
-@@ -0,0 +1,496 @@
-+/*
-+ * RTSP extension for TCP NAT alteration
-+ * (C) 2003 by Tom Marshall <tmarshall at real.com>
-+ * based on ip_nat_irc.c
-+ *
-+ * 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 nf_nat_rtsp.o ports=port1,port2,...port<MAX_PORTS>
-+ * stunaddr=<address>
-+ * destaction=[auto|strip|none]
-+ *
-+ * If no ports are specified, the default will be port 554 only.
-+ *
-+ * stunaddr specifies the address used to detect that a client is using STUN.
-+ * If this address is seen in the destination parameter, it is assumed that
-+ * the client has already punched a UDP hole in the firewall, so we don't
-+ * mangle the client_port. If none is specified, it is autodetected. It
-+ * only needs to be set if you have multiple levels of NAT. It should be
-+ * set to the external address that the STUN clients detect. Note that in
-+ * this case, it will not be possible for clients to use UDP with servers
-+ * between the NATs.
-+ *
-+ * If no destaction is specified, auto is used.
-+ * destaction=auto: strip destination parameter if it is not stunaddr.
-+ * destaction=strip: always strip destination parameter (not recommended).
-+ * destaction=none: do not touch destination parameter (not recommended).
-+ */
-+
-+#include <linux/module.h>
-+#include <net/tcp.h>
-+#include <net/netfilter/nf_nat_helper.h>
-+#include <net/netfilter/nf_nat_rule.h>
-+#include <linux/netfilter/nf_conntrack_rtsp.h>
-+#include <net/netfilter/nf_conntrack_expect.h>
-+
-+#include <linux/inet.h>
-+#include <linux/ctype.h>
-+#define NF_NEED_STRNCASECMP
-+#define NF_NEED_STRTOU16
-+#include <linux/netfilter_helpers.h>
-+#define NF_NEED_MIME_NEXTLINE
-+#include <linux/netfilter_mime.h>
-+
-+#define INFOP(fmt, args...) printk(KERN_INFO "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#if 0
-+#define DEBUGP(fmt, args...) printk(KERN_DEBUG "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#else
-+#define DEBUGP(fmt, args...)
-+#endif
-+
-+#define MAX_PORTS 8
-+#define DSTACT_AUTO 0
-+#define DSTACT_STRIP 1
-+#define DSTACT_NONE 2
-+
-+static char* stunaddr = NULL;
-+static char* destaction = NULL;
-+
-+static u_int32_t extip = 0;
-+static int dstact = 0;
-+
-+MODULE_AUTHOR("Tom Marshall <tmarshall at real.com>");
-+MODULE_DESCRIPTION("RTSP network address translation module");
-+MODULE_LICENSE("GPL");
-+module_param(stunaddr, charp, 0644);
-+MODULE_PARM_DESC(stunaddr, "Address for detecting STUN");
-+module_param(destaction, charp, 0644);
-+MODULE_PARM_DESC(destaction, "Action for destination parameter (auto/strip/none)");
-+
-+#define SKIP_WSPACE(ptr,len,off) while(off < len && isspace(*(ptr+off))) { off++; }
-+
-+/*** helper functions ***/
-+
-+static void
-+get_skb_tcpdata(struct sk_buff* skb, char** pptcpdata, uint* ptcpdatalen)
-+{
-+ struct iphdr* iph = ip_hdr(skb);
-+ struct tcphdr* tcph = (void *)iph + ip_hdrlen(skb);
-+
-+ *pptcpdata = (char*)tcph + tcph->doff*4;
-+ *ptcpdatalen = ((char*)skb_transport_header(skb) + skb->len) - *pptcpdata;
-+}
-+
-+/*** nat functions ***/
-+
-+/*
-+ * Mangle the "Transport:" header:
-+ * - Replace all occurences of "client_port=<spec>"
-+ * - Handle destination parameter
-+ *
-+ * In:
-+ * ct, ctinfo = conntrack context
-+ * skb = packet
-+ * tranoff = Transport header offset from TCP data
-+ * tranlen = Transport header length (incl. CRLF)
-+ * rport_lo = replacement low port (host endian)
-+ * rport_hi = replacement high port (host endian)
-+ *
-+ * Returns packet size difference.
-+ *
-+ * Assumes that a complete transport header is present, ending with CR or LF
-+ */
-+static int
-+rtsp_mangle_tran(enum ip_conntrack_info ctinfo,
-+ struct nf_conntrack_expect* exp,
-+ struct ip_ct_rtsp_expect* prtspexp,
-+ struct sk_buff* skb, uint tranoff, uint tranlen)
-+{
-+ char* ptcp;
-+ uint tcplen;
-+ char* ptran;
-+ char rbuf1[16]; /* Replacement buffer (one port) */
-+ uint rbuf1len; /* Replacement len (one port) */
-+ char rbufa[16]; /* Replacement buffer (all ports) */
-+ uint rbufalen; /* Replacement len (all ports) */
-+ u_int32_t newip;
-+ u_int16_t loport, hiport;
-+ uint off = 0;
-+ uint diff; /* Number of bytes we removed */
-+
-+ struct nf_conn *ct = exp->master;
-+ struct nf_conntrack_tuple *t;
-+
-+ char szextaddr[15+1];
-+ uint extaddrlen;
-+ int is_stun;
-+
-+ get_skb_tcpdata(skb, &ptcp, &tcplen);
-+ ptran = ptcp+tranoff;
-+
-+ if (tranoff+tranlen > tcplen || tcplen-tranoff < tranlen ||
-+ tranlen < 10 || !iseol(ptran[tranlen-1]) ||
-+ nf_strncasecmp(ptran, "Transport:", 10) != 0)
-+ {
-+ INFOP("sanity check failed\n");
-+ return 0;
-+ }
-+ off += 10;
-+ SKIP_WSPACE(ptcp+tranoff, tranlen, off);
-+
-+ newip = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip;
-+ t = &exp->tuple;
-+ t->dst.u3.ip = newip;
-+
-+ extaddrlen = extip ? sprintf(szextaddr, "%u.%u.%u.%u", NIPQUAD(extip))
-+ : sprintf(szextaddr, "%u.%u.%u.%u", NIPQUAD(newip));
-+ DEBUGP("stunaddr=%s (%s)\n", szextaddr, (extip?"forced":"auto"));
-+
-+ rbuf1len = rbufalen = 0;
-+ switch (prtspexp->pbtype)
-+ {
-+ case pb_single:
-+ for (loport = prtspexp->loport; loport != 0; loport++) /* XXX: improper wrap? */
-+ {
-+ t->dst.u.udp.port = htons(loport);
-+ if (nf_ct_expect_related(exp) == 0)
-+ {
-+ DEBUGP("using port %hu\n", loport);
-+ break;
-+ }
-+ }
-+ if (loport != 0)
-+ {
-+ rbuf1len = sprintf(rbuf1, "%hu", loport);
-+ rbufalen = sprintf(rbufa, "%hu", loport);
-+ }
-+ break;
-+ case pb_range:
-+ for (loport = prtspexp->loport; loport != 0; loport += 2) /* XXX: improper wrap? */
-+ {
-+ t->dst.u.udp.port = htons(loport);
-+ if (nf_ct_expect_related(exp) == 0)
-+ {
-+ hiport = loport + ~exp->mask.src.u.udp.port;
-+ DEBUGP("using ports %hu-%hu\n", loport, hiport);
-+ break;
-+ }
-+ }
-+ if (loport != 0)
-+ {
-+ rbuf1len = sprintf(rbuf1, "%hu", loport);
-+ rbufalen = sprintf(rbufa, "%hu-%hu", loport, loport+1);
-+ }
-+ break;
-+ case pb_discon:
-+ for (loport = prtspexp->loport; loport != 0; loport++) /* XXX: improper wrap? */
-+ {
-+ t->dst.u.udp.port = htons(loport);
-+ if (nf_ct_expect_related(exp) == 0)
-+ {
-+ DEBUGP("using port %hu (1 of 2)\n", loport);
-+ break;
-+ }
-+ }
-+ for (hiport = prtspexp->hiport; hiport != 0; hiport++) /* XXX: improper wrap? */
-+ {
-+ t->dst.u.udp.port = htons(hiport);
-+ if (nf_ct_expect_related(exp) == 0)
-+ {
-+ DEBUGP("using port %hu (2 of 2)\n", hiport);
-+ break;
-+ }
-+ }
-+ if (loport != 0 && hiport != 0)
-+ {
-+ rbuf1len = sprintf(rbuf1, "%hu", loport);
-+ if (hiport == loport+1)
-+ {
-+ rbufalen = sprintf(rbufa, "%hu-%hu", loport, hiport);
-+ }
-+ else
-+ {
-+ rbufalen = sprintf(rbufa, "%hu/%hu", loport, hiport);
-+ }
-+ }
-+ break;
-+ }
-+
-+ if (rbuf1len == 0)
-+ {
-+ return 0; /* cannot get replacement port(s) */
-+ }
-+
-+ /* Transport: tran;field;field=val,tran;field;field=val,... */
-+ while (off < tranlen)
-+ {
-+ uint saveoff;
-+ const char* pparamend;
-+ uint nextparamoff;
-+
-+ pparamend = memchr(ptran+off, ',', tranlen-off);
-+ pparamend = (pparamend == NULL) ? ptran+tranlen : pparamend+1;
-+ nextparamoff = pparamend-ptcp;
-+
-+ /*
-+ * We pass over each param twice. On the first pass, we look for a
-+ * destination= field. It is handled by the security policy. If it
-+ * is present, allowed, and equal to our external address, we assume
-+ * that STUN is being used and we leave the client_port= field alone.
-+ */
-+ is_stun = 0;
-+ saveoff = off;
-+ while (off < nextparamoff)
-+ {
-+ const char* pfieldend;
-+ uint nextfieldoff;
-+
-+ pfieldend = memchr(ptran+off, ';', nextparamoff-off);
-+ nextfieldoff = (pfieldend == NULL) ? nextparamoff : pfieldend-ptran+1;
-+
-+ if (dstact != DSTACT_NONE && strncmp(ptran+off, "destination=", 12) == 0)
-+ {
-+ if (strncmp(ptran+off+12, szextaddr, extaddrlen) == 0)
-+ {
-+ is_stun = 1;
-+ }
-+ if (dstact == DSTACT_STRIP || (dstact == DSTACT_AUTO && !is_stun))
-+ {
-+ diff = nextfieldoff-off;
-+ if (!nf_nat_mangle_tcp_packet(skb, ct, ctinfo,
-+ off, diff, NULL, 0))
-+ {
-+ /* mangle failed, all we can do is bail */
-+ nf_ct_unexpect_related(exp);
-+ return 0;
-+ }
-+ get_skb_tcpdata(skb, &ptcp, &tcplen);
-+ ptran = ptcp+tranoff;
-+ tranlen -= diff;
-+ nextparamoff -= diff;
-+ nextfieldoff -= diff;
-+ }
-+ }
-+
-+ off = nextfieldoff;
-+ }
-+ if (is_stun)
-+ {
-+ continue;
-+ }
-+ off = saveoff;
-+ while (off < nextparamoff)
-+ {
-+ const char* pfieldend;
-+ uint nextfieldoff;
-+
-+ pfieldend = memchr(ptran+off, ';', nextparamoff-off);
-+ nextfieldoff = (pfieldend == NULL) ? nextparamoff : pfieldend-ptran+1;
-+
-+ if (strncmp(ptran+off, "client_port=", 12) == 0)
-+ {
-+ u_int16_t port;
-+ uint numlen;
-+ uint origoff;
-+ uint origlen;
-+ char* rbuf = rbuf1;
-+ uint rbuflen = rbuf1len;
-+
-+ off += 12;
-+ origoff = (ptran-ptcp)+off;
-+ origlen = 0;
-+ numlen = nf_strtou16(ptran+off, &port);
-+ off += numlen;
-+ origlen += numlen;
-+ if (port != prtspexp->loport)
-+ {
-+ DEBUGP("multiple ports found, port %hu ignored\n", port);
-+ }
-+ else
-+ {
-+ if (ptran[off] == '-' || ptran[off] == '/')
-+ {
-+ off++;
-+ origlen++;
-+ numlen = nf_strtou16(ptran+off, &port);
-+ off += numlen;
-+ origlen += numlen;
-+ rbuf = rbufa;
-+ rbuflen = rbufalen;
-+ }
-+
-+ /*
-+ * note we cannot just memcpy() if the sizes are the same.
-+ * the mangle function does skb resizing, checks for a
-+ * cloned skb, and updates the checksums.
-+ *
-+ * parameter 4 below is offset from start of tcp data.
-+ */
-+ diff = origlen-rbuflen;
-+ if (!nf_nat_mangle_tcp_packet(skb, ct, ctinfo,
-+ origoff, origlen, rbuf, rbuflen))
-+ {
-+ /* mangle failed, all we can do is bail */
-+ nf_ct_unexpect_related(exp);
-+ return 0;
-+ }
-+ get_skb_tcpdata(skb, &ptcp, &tcplen);
-+ ptran = ptcp+tranoff;
-+ tranlen -= diff;
-+ nextparamoff -= diff;
-+ nextfieldoff -= diff;
-+ }
-+ }
-+
-+ off = nextfieldoff;
-+ }
-+
-+ off = nextparamoff;
-+ }
-+
-+ return 1;
-+}
-+
-+static uint
-+help_out(struct sk_buff *skb, enum ip_conntrack_info ctinfo,
-+ unsigned int matchoff, unsigned int matchlen, struct ip_ct_rtsp_expect* prtspexp,
-+ struct nf_conntrack_expect* exp)
-+{
-+ char* ptcp;
-+ uint tcplen;
-+ uint hdrsoff;
-+ uint hdrslen;
-+ uint lineoff;
-+ uint linelen;
-+ uint off;
-+
-+ //struct iphdr* iph = (struct iphdr*)skb->nh.iph;
-+ //struct tcphdr* tcph = (struct tcphdr*)((void*)iph + iph->ihl*4);
-+
-+ get_skb_tcpdata(skb, &ptcp, &tcplen);
-+ hdrsoff = matchoff;//exp->seq - ntohl(tcph->seq);
-+ hdrslen = matchlen;
-+ off = hdrsoff;
-+ DEBUGP("NAT rtsp help_out\n");
-+
-+ while (nf_mime_nextline(ptcp, hdrsoff+hdrslen, &off, &lineoff, &linelen))
-+ {
-+ if (linelen == 0)
-+ {
-+ break;
-+ }
-+ if (off > hdrsoff+hdrslen)
-+ {
-+ INFOP("!! overrun !!");
-+ break;
-+ }
-+ DEBUGP("hdr: len=%u, %.*s", linelen, (int)linelen, ptcp+lineoff);
-+
-+ if (nf_strncasecmp(ptcp+lineoff, "Transport:", 10) == 0)
-+ {
-+ uint oldtcplen = tcplen;
-+ DEBUGP("hdr: Transport\n");
-+ if (!rtsp_mangle_tran(ctinfo, exp, prtspexp, skb, lineoff, linelen))
-+ {
-+ DEBUGP("hdr: Transport mangle failed");
-+ break;
-+ }
-+ get_skb_tcpdata(skb, &ptcp, &tcplen);
-+ hdrslen -= (oldtcplen-tcplen);
-+ off -= (oldtcplen-tcplen);
-+ lineoff -= (oldtcplen-tcplen);
-+ linelen -= (oldtcplen-tcplen);
-+ DEBUGP("rep: len=%u, %.*s", linelen, (int)linelen, ptcp+lineoff);
-+ }
-+ }
-+
-+ return NF_ACCEPT;
-+}
-+
-+static unsigned int
-+help(struct sk_buff *skb, enum ip_conntrack_info ctinfo,
-+ unsigned int matchoff, unsigned int matchlen, struct ip_ct_rtsp_expect* prtspexp,
-+ struct nf_conntrack_expect* exp)
-+{
-+ int dir = CTINFO2DIR(ctinfo);
-+ int rc = NF_ACCEPT;
-+
-+ switch (dir)
-+ {
-+ case IP_CT_DIR_ORIGINAL:
-+ rc = help_out(skb, ctinfo, matchoff, matchlen, prtspexp, exp);
-+ break;
-+ case IP_CT_DIR_REPLY:
-+ DEBUGP("unmangle ! %u\n", ctinfo);
-+ /* XXX: unmangle */
-+ rc = NF_ACCEPT;
-+ break;
-+ }
-+ //UNLOCK_BH(&ip_rtsp_lock);
-+
-+ return rc;
-+}
-+
-+static void expected(struct nf_conn* ct, struct nf_conntrack_expect *exp)
-+{
-+ struct nf_nat_multi_range_compat mr;
-+ u_int32_t newdstip, newsrcip, newip;
-+
-+ struct nf_conn *master = ct->master;
-+
-+ newdstip = master->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip;
-+ newsrcip = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip;
-+ //FIXME (how to port that ?)
-+ //code from 2.4 : newip = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC) ? newsrcip : newdstip;
-+ newip = newdstip;
-+
-+ DEBUGP("newsrcip=%u.%u.%u.%u, newdstip=%u.%u.%u.%u, newip=%u.%u.%u.%u\n",
-+ NIPQUAD(newsrcip), NIPQUAD(newdstip), NIPQUAD(newip));
-+
-+ mr.rangesize = 1;
-+ // We don't want to manip the per-protocol, just the IPs.
-+ mr.range[0].flags = IP_NAT_RANGE_MAP_IPS;
-+ mr.range[0].min_ip = mr.range[0].max_ip = newip;
-+
-+ nf_nat_setup_info(ct, &mr.range[0], IP_NAT_MANIP_DST);
-+}
-+
-+
-+static void __exit fini(void)
-+{
-+ nf_nat_rtsp_hook = NULL;
-+ nf_nat_rtsp_hook_expectfn = NULL;
-+ synchronize_net();
-+}
-+
-+static int __init init(void)
-+{
-+ printk("nf_nat_rtsp v" IP_NF_RTSP_VERSION " loading\n");
-+
-+ BUG_ON(nf_nat_rtsp_hook);
-+ nf_nat_rtsp_hook = help;
-+ nf_nat_rtsp_hook_expectfn = &expected;
-+
-+ if (stunaddr != NULL)
-+ extip = in_aton(stunaddr);
-+
-+ if (destaction != NULL) {
-+ if (strcmp(destaction, "auto") == 0)
-+ dstact = DSTACT_AUTO;
-+
-+ if (strcmp(destaction, "strip") == 0)
-+ dstact = DSTACT_STRIP;
-+
-+ if (strcmp(destaction, "none") == 0)
-+ dstact = DSTACT_NONE;
-+ }
-+
-+ return 0;
-+}
-+
-+module_init(init);
-+module_exit(fini);
projects / openwrt / svn-archive / archive.git / commitdiff