+++ /dev/null
-diff -NurpP --minimal linux-2.6.21.a/include/linux/netfilter_ipv4/ipt_ROUTE.h linux-2.6.21.b/include/linux/netfilter_ipv4/ipt_ROUTE.h
---- linux-2.6.21.a/include/linux/netfilter_ipv4/ipt_ROUTE.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux-2.6.21.b/include/linux/netfilter_ipv4/ipt_ROUTE.h 2007-05-30 11:40:37.000000000 +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 -NurpP --minimal linux-2.6.21.a/include/linux/netfilter_ipv6/ip6t_ROUTE.h linux-2.6.21.b/include/linux/netfilter_ipv6/ip6t_ROUTE.h
---- linux-2.6.21.a/include/linux/netfilter_ipv6/ip6t_ROUTE.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux-2.6.21.b/include/linux/netfilter_ipv6/ip6t_ROUTE.h 2007-05-30 11:40:37.000000000 +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 -NurpP --minimal linux-2.6.21.a/net/ipv4/netfilter/Kconfig linux-2.6.21.b/net/ipv4/netfilter/Kconfig
---- linux-2.6.21.a/net/ipv4/netfilter/Kconfig 2007-05-30 11:39:28.000000000 +0200
-+++ linux-2.6.21.b/net/ipv4/netfilter/Kconfig 2007-05-30 11:40:37.000000000 +0200
-@@ -813,5 +813,22 @@ config IP_NF_MATCH_U32
-
- Details and examples are in the kernel module source.
-
-+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'.
-+
- endmenu
-
-diff -NurpP --minimal linux-2.6.21.a/net/ipv4/netfilter/Makefile linux-2.6.21.b/net/ipv4/netfilter/Makefile
---- linux-2.6.21.a/net/ipv4/netfilter/Makefile 2007-05-30 11:39:28.000000000 +0200
-+++ linux-2.6.21.b/net/ipv4/netfilter/Makefile 2007-05-30 11:40:37.000000000 +0200
-@@ -74,6 +74,7 @@
- obj-$(CONFIG_IP_NF_TARGET_MASQUERADE) += ipt_MASQUERADE.o
- obj-$(CONFIG_IP_NF_TARGET_NETMAP) += ipt_NETMAP.o
- obj-$(CONFIG_IP_NF_TARGET_REDIRECT) += ipt_REDIRECT.o
-+obj-$(CONFIG_IP_NF_TARGET_ROUTE) += ipt_ROUTE.o
- obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o
- obj-$(CONFIG_IP_NF_TARGET_SAME) += ipt_SAME.o
- obj-$(CONFIG_IP_NF_TARGET_TOS) += ipt_TOS.o
-diff -NurpP --minimal linux-2.6.21.a/net/ipv4/netfilter/ipt_ROUTE.c linux-2.6.21.b/net/ipv4/netfilter/ipt_ROUTE.c
---- linux-2.6.21.a/net/ipv4/netfilter/ipt_ROUTE.c 1970-01-01 01:00:00.000000000 +0100
-+++ linux-2.6.21.b/net/ipv4/netfilter/ipt_ROUTE.c 2007-05-30 11:40:37.000000000 +0200
-@@ -0,0 +1,450 @@
-+/*
-+ * 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/x_tables.h>
-+#include <linux/netfilter_ipv4/ip_tables.h>
-+#include <net/netfilter/nf_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 = ip_hdr(skb);
-+ 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(&init_net, &rt, &fl))) {
-+ if (net_ratelimit())
-+ DEBUGP("ipt_ROUTE: couldn't route pkt (err: %i)",err);
-+ return -1;
-+ }
-+
-+ /* Drop old route. */
-+ skb_dst_drop(skb);
-+
-+
-+ /* Success if no oif specified or if the oif correspond to the
-+ * one desired */
-+ if (!ifindex || rt->u.dst.dev->ifindex == ifindex) {
-+ skb_dst_set(skb, &rt->u.dst);
-+ skb->dev = skb_dst(skb)->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(skb);
-+ 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->header_ops)) {
-+ 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) {
-+ neigh_hh_output(dst->hh, 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(&init_net, 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(&init_net, 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;
-+ skb_dst_drop(skb);
-+
-+
-+ 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 nf_conn route_tee_track;
-+
-+static unsigned int ipt_route_target(struct sk_buff *skb, const struct xt_target_param *par)
-+{
-+ const struct ipt_route_target_info *route_info = par->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 (par->hooknum == NF_INET_PRE_ROUTING ||
-+ par->hooknum == NF_INET_LOCAL_IN) {
-+
-+ struct iphdr *iph = ip_hdr(skb);
-+
-+ 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(&init_net, &rt, &fl)) {
-+ return NF_DROP;
-+ }
-+
-+ if (skb->dev == rt->u.dst.dev) {
-+ /* Drop old route. */
-+ skb_dst_drop(skb);
-+ skb_dst_set(skb, &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(par->hooknum == NF_INET_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(skb, GFP_ATOMIC);
-+ if (!skb) {
-+ if (net_ratelimit())
-+ DEBUGP(KERN_DEBUG "ipt_ROUTE: copy failed!\n");
-+ nf_conntrack_put(skb->nfct);
-+ skb->nfct = &route_tee_track.ct_general;
-+ skb->nfctinfo = IP_CT_NEW;
-+ nf_conntrack_get(skb->nfct);
-+ 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 bool ipt_route_checkentry(const struct xt_tgchk_param *par)
-+/*static bool ipt_route_checkentry(const char *tablename,
-+ const void *e,
-+ const struct xt_target *target,
-+ void *targinfo,
-+
-+ unsigned int hook_mask) */
-+{
-+/* if (strcmp(par->tablename, "mangle") != 0) {
-+ printk("ipt_ROUTE: bad table `%s', use the `mangle' table.\n",
-+ par->tablename);
-+ return 0;
-+ }
-+*/
-+ if (par->hook_mask & ~( (1 << NF_INET_PRE_ROUTING)
-+ | (1 << NF_INET_LOCAL_IN)
-+ | (1 << NF_INET_FORWARD)
-+ | (1 << NF_INET_LOCAL_OUT)
-+ | (1 << NF_INET_POST_ROUTING))) {
-+ printk("ipt_ROUTE: bad hook\n");
-+ return 0;
-+ }
-+
-+ return 1;
-+}
-+
-+static struct xt_target ipt_route_reg __read_mostly = {
-+ .name = "ROUTE",
-+ .family = AF_INET,
-+ .target = ipt_route_target,
-+ .targetsize = sizeof(struct ipt_route_target_info),
-+ .table = "mangle",
-+ .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 xt_register_target(&ipt_route_reg);
-+}
-+
-+
-+static void __exit fini(void)
-+{
-+ xt_unregister_target(&ipt_route_reg);
-+}
-+
-+module_init(init);
-+module_exit(fini);
-diff -NurpP --minimal linux-2.6.21.a/net/ipv6/netfilter/Kconfig linux-2.6.21.b/net/ipv6/netfilter/Kconfig
---- linux-2.6.21.a/net/ipv6/netfilter/Kconfig 2007-05-30 11:13:04.000000000 +0200
-+++ linux-2.6.21.b/net/ipv6/netfilter/Kconfig 2007-05-30 11:40:37.000000000 +0200
-@@ -209,5 +209,18 @@ config IP6_NF_RAW
- If you want to compile it as a module, say M here and read
- <file:Documentation/modules.txt>. 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.
-+
- endmenu
-
-diff -NurpP --minimal linux-2.6.21.a/net/ipv6/netfilter/Makefile linux-2.6.21.b/net/ipv6/netfilter/Makefile
---- linux-2.6.21.a/net/ipv6/netfilter/Makefile 2007-05-30 11:13:04.000000000 +0200
-+++ linux-2.6.21.b/net/ipv6/netfilter/Makefile 2007-05-30 11:40:37.000000000 +0200
-@@ -30,3 +30,4 @@
- obj-$(CONFIG_IP6_NF_TARGET_HL) += ip6t_HL.o
- obj-$(CONFIG_IP6_NF_TARGET_LOG) += ip6t_LOG.o
- obj-$(CONFIG_IP6_NF_TARGET_REJECT) += ip6t_REJECT.o
-+obj-$(CONFIG_IP6_NF_TARGET_ROUTE) += ip6t_ROUTE.o
-diff -NurpP --minimal linux-2.6.21.a/net/ipv6/netfilter/ip6t_ROUTE.c linux-2.6.21.b/net/ipv6/netfilter/ip6t_ROUTE.c
---- linux-2.6.21.a/net/ipv6/netfilter/ip6t_ROUTE.c 1970-01-01 01:00:00.000000000 +0100
-+++ linux-2.6.21.b/net/ipv6/netfilter/ip6t_ROUTE.c 2007-05-30 11:40:37.000000000 +0200
-@@ -0,0 +1,293 @@
-+/*
-+ * 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/x_tables.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 = ipv6_hdr(skb);
-+ 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(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr, ifindex, 1);
-+ else
-+ rt = rt6_lookup(dev_net(skb->dev), 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. */
-+ skb_dst_drop(skb);
-+ skb_dst_set(skb, &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(skb);
-+ struct hh_cache *hh = dst->hh;
-+
-+ if (hh) {
-+ neigh_hh_output(dst->hh, 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(&init_net, 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 *skb, const struct xt_target_param *par)
-+{
-+ const struct ip6t_route_target_info *route_info = par->targinfo;
-+ 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 (par->hooknum == NF_INET_PRE_ROUTING ||
-+ par->hooknum == NF_INET_LOCAL_IN) {
-+
-+ struct ipv6hdr *ipv6h = ipv6_hdr(skb);
-+
-+ if (ipv6h->hop_limit <= 1) {
-+ /* Force OUTPUT device used as source address */
-+ skb->dev = skb_dst(skb)->dev;
-+
-+ icmpv6_send(skb, ICMPV6_TIME_EXCEED,
-+ ICMPV6_EXC_HOPLIMIT, 0);
-+
-+ 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(skb, 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 bool
-+ip6t_route_checkentry(const struct xt_tgchk_param *par)
-+{
-+ /* 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 xt_target ip6t_route_reg __read_mostly = {
-+ .name = "ROUTE",
-+ .family = NFPROTO_IPV6,
-+ .target = ip6t_route_target,
-+ .targetsize = sizeof(struct ip6t_route_target_info),
-+ .table = "mangle",
-+ .checkentry = ip6t_route_checkentry,
-+ .me = THIS_MODULE
-+};
-+
-+
-+static int __init init(void)
-+{
-+ printk(KERN_DEBUG "registering ipv6 ROUTE target\n");
-+ if (xt_register_target(&ip6t_route_reg))
-+ return -EINVAL;
-+
-+ return 0;
-+}
-+
-+
-+static void __exit fini(void)
-+{
-+ xt_unregister_target(&ip6t_route_reg);
-+}
-+
-+module_init(init);
-+module_exit(fini);
-+MODULE_LICENSE("GPL");
---- a/net/ipv6/ndisc.c 2007-07-09 01:32:17.000000000 +0200
-+++ b/net/ipv6/ndisc.c 2007-08-02 13:23:26.000000000 +0200
-@@ -154,6 +154,8 @@ struct neigh_table nd_tbl = {
- .gc_thresh3 = 1024,
- };
-
-+EXPORT_SYMBOL(nd_tbl);
-+
- /* ND options */
- struct ndisc_options {
- struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
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