--- /dev/null
+diff -u'rNF^function' linux-2.6.16.7/include/linux/netfilter_ipv4/ipt_ROUTE.h linux-2.6.16.7-ROUTE/include/linux/netfilter_ipv4/ipt_ROUTE.h
+--- linux-2.6.16.7/include/linux/netfilter_ipv4/ipt_ROUTE.h 1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.16.7-ROUTE/include/linux/netfilter_ipv4/ipt_ROUTE.h 2006-06-14 16:40:49.000000000 +0200
+@@ -0,0 +1,23 @@
++/* Header file for iptables ipt_ROUTE target
++ *
++ * (C) 2002 by Cédric de Launois <delaunois@info.ucl.ac.be>
++ *
++ * This software is distributed under GNU GPL v2, 1991
++ */
++#ifndef _IPT_ROUTE_H_target
++#define _IPT_ROUTE_H_target
++
++#define IPT_ROUTE_IFNAMSIZ 16
++
++struct ipt_route_target_info {
++ char oif[IPT_ROUTE_IFNAMSIZ]; /* Output Interface Name */
++ char iif[IPT_ROUTE_IFNAMSIZ]; /* Input Interface Name */
++ u_int32_t gw; /* IP address of gateway */
++ u_int8_t flags;
++};
++
++/* Values for "flags" field */
++#define IPT_ROUTE_CONTINUE 0x01
++#define IPT_ROUTE_TEE 0x02
++
++#endif /*_IPT_ROUTE_H_target*/
+diff -u'rNF^function' linux-2.6.16.7/include/linux/netfilter_ipv6/ip6t_ROUTE.h linux-2.6.16.7-ROUTE/include/linux/netfilter_ipv6/ip6t_ROUTE.h
+--- linux-2.6.16.7/include/linux/netfilter_ipv6/ip6t_ROUTE.h 1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.16.7-ROUTE/include/linux/netfilter_ipv6/ip6t_ROUTE.h 2006-06-14 16:41:08.000000000 +0200
+@@ -0,0 +1,23 @@
++/* Header file for iptables ip6t_ROUTE target
++ *
++ * (C) 2003 by Cédric de Launois <delaunois@info.ucl.ac.be>
++ *
++ * This software is distributed under GNU GPL v2, 1991
++ */
++#ifndef _IPT_ROUTE_H_target
++#define _IPT_ROUTE_H_target
++
++#define IP6T_ROUTE_IFNAMSIZ 16
++
++struct ip6t_route_target_info {
++ char oif[IP6T_ROUTE_IFNAMSIZ]; /* Output Interface Name */
++ char iif[IP6T_ROUTE_IFNAMSIZ]; /* Input Interface Name */
++ u_int32_t gw[4]; /* IPv6 address of gateway */
++ u_int8_t flags;
++};
++
++/* Values for "flags" field */
++#define IP6T_ROUTE_CONTINUE 0x01
++#define IP6T_ROUTE_TEE 0x02
++
++#endif /*_IP6T_ROUTE_H_target*/
+diff -u'rNF^function' linux-2.6.16.7/net/ipv4/netfilter/Kconfig linux-2.6.16.7-ROUTE/net/ipv4/netfilter/Kconfig
+--- linux-2.6.16.7/net/ipv4/netfilter/Kconfig 2006-06-14 16:05:44.000000000 +0200
++++ linux-2.6.16.7-ROUTE/net/ipv4/netfilter/Kconfig 2006-06-14 16:46:40.000000000 +0200
+@@ -491,6 +491,23 @@
+
+ To compile it as a module, choose M here. If unsure, say N.
+
++config IP_NF_TARGET_ROUTE
++ tristate 'ROUTE target support'
++ depends on IP_NF_MANGLE
++ help
++ This option adds a `ROUTE' target, which enables you to setup unusual
++ routes. For example, the ROUTE lets you route a received packet through
++ an interface or towards a host, even if the regular destination of the
++ packet is the router itself. The ROUTE target is also able to change the
++ incoming interface of a packet.
++
++ The target can be or not a final target. It has to be used inside the
++ mangle table.
++
++ If you want to compile it as a module, say M here and read
++ Documentation/modules.txt. The module will be called ipt_ROUTE.o.
++ If unsure, say `N'.
++
+ config IP_NF_TARGET_NETMAP
+ tristate "NETMAP target support"
+ depends on IP_NF_NAT
+diff -u'rNF^function' linux-2.6.16.7/net/ipv4/netfilter/Makefile linux-2.6.16.7-ROUTE/net/ipv4/netfilter/Makefile
+--- linux-2.6.16.7/net/ipv4/netfilter/Makefile 2006-06-14 16:05:44.000000000 +0200
++++ linux-2.6.16.7-ROUTE/net/ipv4/netfilter/Makefile 2006-06-14 16:44:02.000000000 +0200
+@@ -74,6 +74,7 @@
+ obj-$(CONFIG_IP_NF_TARGET_IMQ) += ipt_IMQ.o
+ obj-$(CONFIG_IP_NF_TARGET_MASQUERADE) += ipt_MASQUERADE.o
+ obj-$(CONFIG_IP_NF_TARGET_REDIRECT) += ipt_REDIRECT.o
++obj-$(CONFIG_IP_NF_TARGET_ROUTE) += ipt_ROUTE.o
+ obj-$(CONFIG_IP_NF_TARGET_NETMAP) += ipt_NETMAP.o
+ obj-$(CONFIG_IP_NF_TARGET_SAME) += ipt_SAME.o
+ obj-$(CONFIG_IP_NF_NAT_SNMP_BASIC) += ip_nat_snmp_basic.o
+diff -u'rNF^function' linux-2.6.16.7/net/ipv4/netfilter/ipt_ROUTE.c linux-2.6.16.7-ROUTE/net/ipv4/netfilter/ipt_ROUTE.c
+--- linux-2.6.16.7/net/ipv4/netfilter/ipt_ROUTE.c 1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.16.7-ROUTE/net/ipv4/netfilter/ipt_ROUTE.c 2006-06-14 16:42:23.000000000 +0200
+@@ -0,0 +1,461 @@
++/*
++ * This implements the ROUTE target, which enables you to setup unusual
++ * routes not supported by the standard kernel routing table.
++ *
++ * Copyright (C) 2002 Cedric de Launois <delaunois@info.ucl.ac.be>
++ *
++ * v 1.11 2004/11/23
++ *
++ * This software is distributed under GNU GPL v2, 1991
++ */
++
++#include <linux/module.h>
++#include <linux/skbuff.h>
++#include <linux/ip.h>
++#include <linux/netfilter_ipv4/ip_tables.h>
++#include <linux/netfilter_ipv4/ip_conntrack.h>
++#include <linux/netfilter_ipv4/ipt_ROUTE.h>
++#include <linux/netdevice.h>
++#include <linux/route.h>
++#include <linux/if_arp.h>
++#include <net/ip.h>
++#include <net/route.h>
++#include <net/icmp.h>
++#include <net/checksum.h>
++
++#if 0
++#define DEBUGP printk
++#else
++#define DEBUGP(format, args...)
++#endif
++
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("Cedric de Launois <delaunois@info.ucl.ac.be>");
++MODULE_DESCRIPTION("iptables ROUTE target module");
++
++/* Try to route the packet according to the routing keys specified in
++ * route_info. Keys are :
++ * - ifindex :
++ * 0 if no oif preferred,
++ * otherwise set to the index of the desired oif
++ * - route_info->gw :
++ * 0 if no gateway specified,
++ * otherwise set to the next host to which the pkt must be routed
++ * If success, skb->dev is the output device to which the packet must
++ * be sent and skb->dst is not NULL
++ *
++ * RETURN: -1 if an error occured
++ * 1 if the packet was succesfully routed to the
++ * destination desired
++ * 0 if the kernel routing table could not route the packet
++ * according to the keys specified
++ */
++static int route(struct sk_buff *skb,
++ unsigned int ifindex,
++ const struct ipt_route_target_info *route_info)
++{
++ int err;
++ struct rtable *rt;
++ struct iphdr *iph = skb->nh.iph;
++ struct flowi fl = {
++ .oif = ifindex,
++ .nl_u = {
++ .ip4_u = {
++ .daddr = iph->daddr,
++ .saddr = 0,
++ .tos = RT_TOS(iph->tos),
++ .scope = RT_SCOPE_UNIVERSE,
++ }
++ }
++ };
++
++ /* The destination address may be overloaded by the target */
++ if (route_info->gw)
++ fl.fl4_dst = route_info->gw;
++
++ /* Trying to route the packet using the standard routing table. */
++ if ((err = ip_route_output_key(&rt, &fl))) {
++ if (net_ratelimit())
++ DEBUGP("ipt_ROUTE: couldn't route pkt (err: %i)",err);
++ return -1;
++ }
++
++ /* Drop old route. */
++ dst_release(skb->dst);
++ skb->dst = NULL;
++
++ /* Success if no oif specified or if the oif correspond to the
++ * one desired */
++ if (!ifindex || rt->u.dst.dev->ifindex == ifindex) {
++ skb->dst = &rt->u.dst;
++ skb->dev = skb->dst->dev;
++ skb->protocol = htons(ETH_P_IP);
++ return 1;
++ }
++
++ /* The interface selected by the routing table is not the one
++ * specified by the user. This may happen because the dst address
++ * is one of our own addresses.
++ */
++ if (net_ratelimit())
++ DEBUGP("ipt_ROUTE: failed to route as desired gw=%u.%u.%u.%u oif=%i (got oif=%i)\n",
++ NIPQUAD(route_info->gw), ifindex, rt->u.dst.dev->ifindex);
++
++ return 0;
++}
++
++
++/* Stolen from ip_finish_output2
++ * PRE : skb->dev is set to the device we are leaving by
++ * skb->dst is not NULL
++ * POST: the packet is sent with the link layer header pushed
++ * the packet is destroyed
++ */
++static void ip_direct_send(struct sk_buff *skb)
++{
++ struct dst_entry *dst = skb->dst;
++ struct hh_cache *hh = dst->hh;
++ struct net_device *dev = dst->dev;
++ int hh_len = LL_RESERVED_SPACE(dev);
++
++ /* Be paranoid, rather than too clever. */
++ if (unlikely(skb_headroom(skb) < hh_len && dev->hard_header)) {
++ struct sk_buff *skb2;
++
++ skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
++ if (skb2 == NULL) {
++ kfree_skb(skb);
++ return;
++ }
++ if (skb->sk)
++ skb_set_owner_w(skb2, skb->sk);
++ kfree_skb(skb);
++ skb = skb2;
++ }
++
++ if (hh) {
++ int hh_alen;
++
++ read_lock_bh(&hh->hh_lock);
++ hh_alen = HH_DATA_ALIGN(hh->hh_len);
++ memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
++ read_unlock_bh(&hh->hh_lock);
++ skb_push(skb, hh->hh_len);
++ hh->hh_output(skb);
++ } else if (dst->neighbour)
++ dst->neighbour->output(skb);
++ else {
++ if (net_ratelimit())
++ DEBUGP(KERN_DEBUG "ipt_ROUTE: no hdr & no neighbour cache!\n");
++ kfree_skb(skb);
++ }
++}
++
++
++/* PRE : skb->dev is set to the device we are leaving by
++ * POST: - the packet is directly sent to the skb->dev device, without
++ * pushing the link layer header.
++ * - the packet is destroyed
++ */
++static inline int dev_direct_send(struct sk_buff *skb)
++{
++ return dev_queue_xmit(skb);
++}
++
++
++static unsigned int route_oif(const struct ipt_route_target_info *route_info,
++ struct sk_buff *skb)
++{
++ unsigned int ifindex = 0;
++ struct net_device *dev_out = NULL;
++
++ /* The user set the interface name to use.
++ * Getting the current interface index.
++ */
++ if ((dev_out = dev_get_by_name(route_info->oif))) {
++ ifindex = dev_out->ifindex;
++ } else {
++ /* Unknown interface name : packet dropped */
++ if (net_ratelimit())
++ DEBUGP("ipt_ROUTE: oif interface %s not found\n", route_info->oif);
++ return NF_DROP;
++ }
++
++ /* Trying the standard way of routing packets */
++ switch (route(skb, ifindex, route_info)) {
++ case 1:
++ dev_put(dev_out);
++ if (route_info->flags & IPT_ROUTE_CONTINUE)
++ return IPT_CONTINUE;
++
++ ip_direct_send(skb);
++ return NF_STOLEN;
++
++ case 0:
++ /* Failed to send to oif. Trying the hard way */
++ if (route_info->flags & IPT_ROUTE_CONTINUE)
++ return NF_DROP;
++
++ if (net_ratelimit())
++ DEBUGP("ipt_ROUTE: forcing the use of %i\n",
++ ifindex);
++
++ /* We have to force the use of an interface.
++ * This interface must be a tunnel interface since
++ * otherwise we can't guess the hw address for
++ * the packet. For a tunnel interface, no hw address
++ * is needed.
++ */
++ if ((dev_out->type != ARPHRD_TUNNEL)
++ && (dev_out->type != ARPHRD_IPGRE)) {
++ if (net_ratelimit())
++ DEBUGP("ipt_ROUTE: can't guess the hw addr !\n");
++ dev_put(dev_out);
++ return NF_DROP;
++ }
++
++ /* Send the packet. This will also free skb
++ * Do not go through the POST_ROUTING hook because
++ * skb->dst is not set and because it will probably
++ * get confused by the destination IP address.
++ */
++ skb->dev = dev_out;
++ dev_direct_send(skb);
++ dev_put(dev_out);
++ return NF_STOLEN;
++
++ default:
++ /* Unexpected error */
++ dev_put(dev_out);
++ return NF_DROP;
++ }
++}
++
++
++static unsigned int route_iif(const struct ipt_route_target_info *route_info,
++ struct sk_buff *skb)
++{
++ struct net_device *dev_in = NULL;
++
++ /* Getting the current interface index. */
++ if (!(dev_in = dev_get_by_name(route_info->iif))) {
++ if (net_ratelimit())
++ DEBUGP("ipt_ROUTE: iif interface %s not found\n", route_info->iif);
++ return NF_DROP;
++ }
++
++ skb->dev = dev_in;
++ dst_release(skb->dst);
++ skb->dst = NULL;
++
++ netif_rx(skb);
++ dev_put(dev_in);
++ return NF_STOLEN;
++}
++
++
++static unsigned int route_gw(const struct ipt_route_target_info *route_info,
++ struct sk_buff *skb)
++{
++ if (route(skb, 0, route_info)!=1)
++ return NF_DROP;
++
++ if (route_info->flags & IPT_ROUTE_CONTINUE)
++ return IPT_CONTINUE;
++
++ ip_direct_send(skb);
++ return NF_STOLEN;
++}
++
++
++/* To detect and deter routed packet loopback when using the --tee option,
++ * we take a page out of the raw.patch book: on the copied skb, we set up
++ * a fake ->nfct entry, pointing to the local &route_tee_track. We skip
++ * routing packets when we see they already have that ->nfct.
++ */
++
++static struct ip_conntrack route_tee_track;
++
++static unsigned int ipt_route_target(struct sk_buff **pskb,
++ const struct net_device *in,
++ const struct net_device *out,
++ unsigned int hooknum,
++ const void *targinfo,
++ void *userinfo)
++{
++ const struct ipt_route_target_info *route_info = targinfo;
++ struct sk_buff *skb = *pskb;
++ unsigned int res;
++
++ if (skb->nfct == &route_tee_track.ct_general) {
++ /* Loopback - a packet we already routed, is to be
++ * routed another time. Avoid that, now.
++ */
++ if (net_ratelimit())
++ DEBUGP(KERN_DEBUG "ipt_ROUTE: loopback - DROP!\n");
++ return NF_DROP;
++ }
++
++ /* If we are at PREROUTING or INPUT hook
++ * the TTL isn't decreased by the IP stack
++ */
++ if (hooknum == NF_IP_PRE_ROUTING ||
++ hooknum == NF_IP_LOCAL_IN) {
++
++ struct iphdr *iph = skb->nh.iph;
++
++ if (iph->ttl <= 1) {
++ struct rtable *rt;
++ struct flowi fl = {
++ .oif = 0,
++ .nl_u = {
++ .ip4_u = {
++ .daddr = iph->daddr,
++ .saddr = iph->saddr,
++ .tos = RT_TOS(iph->tos),
++ .scope = ((iph->tos & RTO_ONLINK) ?
++ RT_SCOPE_LINK :
++ RT_SCOPE_UNIVERSE)
++ }
++ }
++ };
++
++ if (ip_route_output_key(&rt, &fl)) {
++ return NF_DROP;
++ }
++
++ if (skb->dev == rt->u.dst.dev) {
++ /* Drop old route. */
++ dst_release(skb->dst);
++ skb->dst = &rt->u.dst;
++
++ /* this will traverse normal stack, and
++ * thus call conntrack on the icmp packet */
++ icmp_send(skb, ICMP_TIME_EXCEEDED,
++ ICMP_EXC_TTL, 0);
++ }
++
++ return NF_DROP;
++ }
++
++ /*
++ * If we are at INPUT the checksum must be recalculated since
++ * the length could change as the result of a defragmentation.
++ */
++ if(hooknum == NF_IP_LOCAL_IN) {
++ iph->ttl = iph->ttl - 1;
++ iph->check = 0;
++ iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
++ } else {
++ ip_decrease_ttl(iph);
++ }
++ }
++
++ if ((route_info->flags & IPT_ROUTE_TEE)) {
++ /*
++ * Copy the *pskb, and route the copy. Will later return
++ * IPT_CONTINUE for the original skb, which should continue
++ * on its way as if nothing happened. The copy should be
++ * independantly delivered to the ROUTE --gw.
++ */
++ skb = skb_copy(*pskb, GFP_ATOMIC);
++ if (!skb) {
++ if (net_ratelimit())
++ DEBUGP(KERN_DEBUG "ipt_ROUTE: copy failed!\n");
++ return IPT_CONTINUE;
++ }
++ }
++
++ /* Tell conntrack to forget this packet since it may get confused
++ * when a packet is leaving with dst address == our address.
++ * Good idea ? Dunno. Need advice.
++ *
++ * NEW: mark the skb with our &route_tee_track, so we avoid looping
++ * on any already routed packet.
++ */
++ if (!(route_info->flags & IPT_ROUTE_CONTINUE)) {
++ nf_conntrack_put(skb->nfct);
++ skb->nfct = &route_tee_track.ct_general;
++ skb->nfctinfo = IP_CT_NEW;
++ nf_conntrack_get(skb->nfct);
++ }
++
++ if (route_info->oif[0] != '\0') {
++ res = route_oif(route_info, skb);
++ } else if (route_info->iif[0] != '\0') {
++ res = route_iif(route_info, skb);
++ } else if (route_info->gw) {
++ res = route_gw(route_info, skb);
++ } else {
++ if (net_ratelimit())
++ DEBUGP(KERN_DEBUG "ipt_ROUTE: no parameter !\n");
++ res = IPT_CONTINUE;
++ }
++
++ if ((route_info->flags & IPT_ROUTE_TEE))
++ res = IPT_CONTINUE;
++
++ return res;
++}
++
++
++static int ipt_route_checkentry(const char *tablename,
++ const void *e,
++ void *targinfo,
++ unsigned int targinfosize,
++ unsigned int hook_mask)
++{
++ if (strcmp(tablename, "mangle") != 0) {
++ printk("ipt_ROUTE: bad table `%s', use the `mangle' table.\n",
++ tablename);
++ return 0;
++ }
++
++ if (hook_mask & ~( (1 << NF_IP_PRE_ROUTING)
++ | (1 << NF_IP_LOCAL_IN)
++ | (1 << NF_IP_FORWARD)
++ | (1 << NF_IP_LOCAL_OUT)
++ | (1 << NF_IP_POST_ROUTING))) {
++ printk("ipt_ROUTE: bad hook\n");
++ return 0;
++ }
++
++ if (targinfosize != IPT_ALIGN(sizeof(struct ipt_route_target_info))) {
++ printk(KERN_WARNING "ipt_ROUTE: targinfosize %u != %Zu\n",
++ targinfosize,
++ IPT_ALIGN(sizeof(struct ipt_route_target_info)));
++ return 0;
++ }
++
++ return 1;
++}
++
++
++static struct ipt_target ipt_route_reg = {
++ .name = "ROUTE",
++ .target = ipt_route_target,
++ .checkentry = ipt_route_checkentry,
++ .me = THIS_MODULE,
++};
++
++static int __init init(void)
++{
++ /* Set up fake conntrack (stolen from raw.patch):
++ - to never be deleted, not in any hashes */
++ atomic_set(&route_tee_track.ct_general.use, 1);
++ /* - and look it like as a confirmed connection */
++ set_bit(IPS_CONFIRMED_BIT, &route_tee_track.status);
++ /* Initialize fake conntrack so that NAT will skip it */
++ route_tee_track.status |= IPS_NAT_DONE_MASK;
++
++ return ipt_register_target(&ipt_route_reg);
++}
++
++
++static void __exit fini(void)
++{
++ ipt_unregister_target(&ipt_route_reg);
++}
++
++module_init(init);
++module_exit(fini);
+diff -u'rNF^function' linux-2.6.16.7/net/ipv6/ipv6_syms.c linux-2.6.16.7-ROUTE/net/ipv6/ipv6_syms.c
+--- linux-2.6.16.7/net/ipv6/ipv6_syms.c 2006-04-17 23:53:25.000000000 +0200
++++ linux-2.6.16.7-ROUTE/net/ipv6/ipv6_syms.c 2006-06-14 17:02:32.000000000 +0200
+@@ -12,6 +12,7 @@
+ EXPORT_SYMBOL(icmpv6_statistics);
+ EXPORT_SYMBOL(icmpv6_err_convert);
+ EXPORT_SYMBOL(ndisc_mc_map);
++EXPORT_SYMBOL(nd_tbl);
+ EXPORT_SYMBOL(register_inet6addr_notifier);
+ EXPORT_SYMBOL(unregister_inet6addr_notifier);
+ EXPORT_SYMBOL(ip6_route_output);
+diff -u'rNF^function' linux-2.6.16.7/net/ipv6/netfilter/Kconfig linux-2.6.16.7-ROUTE/net/ipv6/netfilter/Kconfig
+--- linux-2.6.16.7/net/ipv6/netfilter/Kconfig 2006-06-14 16:05:44.000000000 +0200
++++ linux-2.6.16.7-ROUTE/net/ipv6/netfilter/Kconfig 2006-06-14 16:45:45.000000000 +0200
+@@ -182,6 +182,19 @@
+
+ To compile it as a module, choose M here. If unsure, say N.
+
++config IP6_NF_TARGET_ROUTE
++ tristate ' ROUTE target support'
++ depends on IP6_NF_MANGLE
++ help
++ This option adds a `ROUTE' target, which enables you to setup unusual
++ routes. The ROUTE target is also able to change the incoming interface
++ of a packet.
++
++ The target can be or not a final target. It has to be used inside the
++ mangle table.
++
++ Not working as a module.
++
+ config IP6_NF_MANGLE
+ tristate "Packet mangling"
+ depends on IP6_NF_IPTABLES
+diff -u'rNF^function' linux-2.6.16.7/net/ipv6/netfilter/Makefile linux-2.6.16.7-ROUTE/net/ipv6/netfilter/Makefile
+--- linux-2.6.16.7/net/ipv6/netfilter/Makefile 2006-06-14 16:05:44.000000000 +0200
++++ linux-2.6.16.7-ROUTE/net/ipv6/netfilter/Makefile 2006-06-14 16:45:00.000000000 +0200
+@@ -22,6 +22,7 @@
+ obj-$(CONFIG_IP6_NF_RAW) += ip6table_raw.o
+ obj-$(CONFIG_IP6_NF_MATCH_HL) += ip6t_hl.o
+ obj-$(CONFIG_IP6_NF_TARGET_REJECT) += ip6t_REJECT.o
++obj-$(CONFIG_IP6_NF_TARGET_ROUTE) += ip6t_ROUTE.o
+
+ # objects for l3 independent conntrack
+ nf_conntrack_ipv6-objs := nf_conntrack_l3proto_ipv6.o nf_conntrack_proto_icmpv6.o nf_conntrack_reasm.o
+diff -u'rNF^function' linux-2.6.16.7/net/ipv6/netfilter/ip6t_ROUTE.c linux-2.6.16.7-ROUTE/net/ipv6/netfilter/ip6t_ROUTE.c
+--- linux-2.6.16.7/net/ipv6/netfilter/ip6t_ROUTE.c 1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.16.7-ROUTE/net/ipv6/netfilter/ip6t_ROUTE.c 2006-06-14 16:42:44.000000000 +0200
+@@ -0,0 +1,308 @@
++/*
++ * This implements the ROUTE v6 target, which enables you to setup unusual
++ * routes not supported by the standard kernel routing table.
++ *
++ * Copyright (C) 2003 Cedric de Launois <delaunois@info.ucl.ac.be>
++ *
++ * v 1.1 2004/11/23
++ *
++ * This software is distributed under GNU GPL v2, 1991
++ */
++
++#include <linux/module.h>
++#include <linux/skbuff.h>
++#include <linux/ipv6.h>
++#include <linux/netfilter_ipv6/ip6_tables.h>
++#include <linux/netfilter_ipv6/ip6t_ROUTE.h>
++#include <linux/netdevice.h>
++#include <net/ipv6.h>
++#include <net/ndisc.h>
++#include <net/ip6_route.h>
++#include <linux/icmpv6.h>
++
++#if 1
++#define DEBUGP printk
++#else
++#define DEBUGP(format, args...)
++#endif
++
++#define NIP6(addr) \
++ ntohs((addr).s6_addr16[0]), \
++ ntohs((addr).s6_addr16[1]), \
++ ntohs((addr).s6_addr16[2]), \
++ ntohs((addr).s6_addr16[3]), \
++ ntohs((addr).s6_addr16[4]), \
++ ntohs((addr).s6_addr16[5]), \
++ ntohs((addr).s6_addr16[6]), \
++ ntohs((addr).s6_addr16[7])
++
++/* Route the packet according to the routing keys specified in
++ * route_info. Keys are :
++ * - ifindex :
++ * 0 if no oif preferred,
++ * otherwise set to the index of the desired oif
++ * - route_info->gw :
++ * 0 if no gateway specified,
++ * otherwise set to the next host to which the pkt must be routed
++ * If success, skb->dev is the output device to which the packet must
++ * be sent and skb->dst is not NULL
++ *
++ * RETURN: 1 if the packet was succesfully routed to the
++ * destination desired
++ * 0 if the kernel routing table could not route the packet
++ * according to the keys specified
++ */
++static int
++route6(struct sk_buff *skb,
++ unsigned int ifindex,
++ const struct ip6t_route_target_info *route_info)
++{
++ struct rt6_info *rt = NULL;
++ struct ipv6hdr *ipv6h = skb->nh.ipv6h;
++ struct in6_addr *gw = (struct in6_addr*)&route_info->gw;
++
++ DEBUGP("ip6t_ROUTE: called with: ");
++ DEBUGP("DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(ipv6h->daddr));
++ DEBUGP("GATEWAY=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(*gw));
++ DEBUGP("OUT=%s\n", route_info->oif);
++
++ if (ipv6_addr_any(gw))
++ rt = rt6_lookup(&ipv6h->daddr, &ipv6h->saddr, ifindex, 1);
++ else
++ rt = rt6_lookup(gw, &ipv6h->saddr, ifindex, 1);
++
++ if (!rt)
++ goto no_route;
++
++ DEBUGP("ip6t_ROUTE: routing gives: ");
++ DEBUGP("DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(rt->rt6i_dst.addr));
++ DEBUGP("GATEWAY=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(rt->rt6i_gateway));
++ DEBUGP("OUT=%s\n", rt->rt6i_dev->name);
++
++ if (ifindex && rt->rt6i_dev->ifindex!=ifindex)
++ goto wrong_route;
++
++ if (!rt->rt6i_nexthop) {
++ DEBUGP("ip6t_ROUTE: discovering neighbour\n");
++ rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_dst.addr);
++ }
++
++ /* Drop old route. */
++ dst_release(skb->dst);
++ skb->dst = &rt->u.dst;
++ skb->dev = rt->rt6i_dev;
++ return 1;
++
++ wrong_route:
++ dst_release(&rt->u.dst);
++ no_route:
++ if (!net_ratelimit())
++ return 0;
++
++ printk("ip6t_ROUTE: no explicit route found ");
++ if (ifindex)
++ printk("via interface %s ", route_info->oif);
++ if (!ipv6_addr_any(gw))
++ printk("via gateway %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x", NIP6(*gw));
++ printk("\n");
++ return 0;
++}
++
++
++/* Stolen from ip6_output_finish
++ * PRE : skb->dev is set to the device we are leaving by
++ * skb->dst is not NULL
++ * POST: the packet is sent with the link layer header pushed
++ * the packet is destroyed
++ */
++static void ip_direct_send(struct sk_buff *skb)
++{
++ struct dst_entry *dst = skb->dst;
++ struct hh_cache *hh = dst->hh;
++
++ if (hh) {
++ read_lock_bh(&hh->hh_lock);
++ memcpy(skb->data - 16, hh->hh_data, 16);
++ read_unlock_bh(&hh->hh_lock);
++ skb_push(skb, hh->hh_len);
++ hh->hh_output(skb);
++ } else if (dst->neighbour)
++ dst->neighbour->output(skb);
++ else {
++ if (net_ratelimit())
++ DEBUGP(KERN_DEBUG "ip6t_ROUTE: no hdr & no neighbour cache!\n");
++ kfree_skb(skb);
++ }
++}
++
++
++static unsigned int
++route6_oif(const struct ip6t_route_target_info *route_info,
++ struct sk_buff *skb)
++{
++ unsigned int ifindex = 0;
++ struct net_device *dev_out = NULL;
++
++ /* The user set the interface name to use.
++ * Getting the current interface index.
++ */
++ if ((dev_out = dev_get_by_name(route_info->oif))) {
++ ifindex = dev_out->ifindex;
++ } else {
++ /* Unknown interface name : packet dropped */
++ if (net_ratelimit())
++ DEBUGP("ip6t_ROUTE: oif interface %s not found\n", route_info->oif);
++
++ if (route_info->flags & IP6T_ROUTE_CONTINUE)
++ return IP6T_CONTINUE;
++ else
++ return NF_DROP;
++ }
++
++ /* Trying the standard way of routing packets */
++ if (route6(skb, ifindex, route_info)) {
++ dev_put(dev_out);
++ if (route_info->flags & IP6T_ROUTE_CONTINUE)
++ return IP6T_CONTINUE;
++
++ ip_direct_send(skb);
++ return NF_STOLEN;
++ } else
++ return NF_DROP;
++}
++
++
++static unsigned int
++route6_gw(const struct ip6t_route_target_info *route_info,
++ struct sk_buff *skb)
++{
++ if (route6(skb, 0, route_info)) {
++ if (route_info->flags & IP6T_ROUTE_CONTINUE)
++ return IP6T_CONTINUE;
++
++ ip_direct_send(skb);
++ return NF_STOLEN;
++ } else
++ return NF_DROP;
++}
++
++
++static unsigned int
++ip6t_route_target(struct sk_buff **pskb,
++ const struct net_device *in,
++ const struct net_device *out,
++ unsigned int hooknum,
++ const void *targinfo,
++ void *userinfo)
++{
++ const struct ip6t_route_target_info *route_info = targinfo;
++ struct sk_buff *skb = *pskb;
++ struct in6_addr *gw = (struct in6_addr*)&route_info->gw;
++ unsigned int res;
++
++ if (route_info->flags & IP6T_ROUTE_CONTINUE)
++ goto do_it;
++
++ /* If we are at PREROUTING or INPUT hook
++ * the TTL isn't decreased by the IP stack
++ */
++ if (hooknum == NF_IP6_PRE_ROUTING ||
++ hooknum == NF_IP6_LOCAL_IN) {
++
++ struct ipv6hdr *ipv6h = skb->nh.ipv6h;
++
++ if (ipv6h->hop_limit <= 1) {
++ /* Force OUTPUT device used as source address */
++ skb->dev = skb->dst->dev;
++
++ icmpv6_send(skb, ICMPV6_TIME_EXCEED,
++ ICMPV6_EXC_HOPLIMIT, 0, skb->dev);
++
++ return NF_DROP;
++ }
++
++ ipv6h->hop_limit--;
++ }
++
++ if ((route_info->flags & IP6T_ROUTE_TEE)) {
++ /*
++ * Copy the *pskb, and route the copy. Will later return
++ * IP6T_CONTINUE for the original skb, which should continue
++ * on its way as if nothing happened. The copy should be
++ * independantly delivered to the ROUTE --gw.
++ */
++ skb = skb_copy(*pskb, GFP_ATOMIC);
++ if (!skb) {
++ if (net_ratelimit())
++ DEBUGP(KERN_DEBUG "ip6t_ROUTE: copy failed!\n");
++ return IP6T_CONTINUE;
++ }
++ }
++
++do_it:
++ if (route_info->oif[0]) {
++ res = route6_oif(route_info, skb);
++ } else if (!ipv6_addr_any(gw)) {
++ res = route6_gw(route_info, skb);
++ } else {
++ if (net_ratelimit())
++ DEBUGP(KERN_DEBUG "ip6t_ROUTE: no parameter !\n");
++ res = IP6T_CONTINUE;
++ }
++
++ if ((route_info->flags & IP6T_ROUTE_TEE))
++ res = IP6T_CONTINUE;
++
++ return res;
++}
++
++
++static int
++ip6t_route_checkentry(const char *tablename,
++ const struct ip6t_entry *e,
++ void *targinfo,
++ unsigned int targinfosize,
++ unsigned int hook_mask)
++{
++ if (strcmp(tablename, "mangle") != 0) {
++ printk("ip6t_ROUTE: can only be called from \"mangle\" table.\n");
++ return 0;
++ }
++
++ if (targinfosize != IP6T_ALIGN(sizeof(struct ip6t_route_target_info))) {
++ printk(KERN_WARNING "ip6t_ROUTE: targinfosize %u != %Zu\n",
++ targinfosize,
++ IP6T_ALIGN(sizeof(struct ip6t_route_target_info)));
++ return 0;
++ }
++
++ return 1;
++}
++
++
++static struct ip6t_target ip6t_route_reg = {
++ .name = "ROUTE",
++ .target = ip6t_route_target,
++ .checkentry = ip6t_route_checkentry,
++ .me = THIS_MODULE
++};
++
++
++static int __init init(void)
++{
++ printk(KERN_DEBUG "registering ipv6 ROUTE target\n");
++ if (ip6t_register_target(&ip6t_route_reg))
++ return -EINVAL;
++
++ return 0;
++}
++
++
++static void __exit fini(void)
++{
++ ip6t_unregister_target(&ip6t_route_reg);
++}
++
++module_init(init);
++module_exit(fini);
++MODULE_LICENSE("GPL");
projects / openwrt / staging / nbd.git / commitdiff