Merge with git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
[linux-2.6] / net / ipv6 / netfilter.c
1 #include <linux/kernel.h>
2 #include <linux/init.h>
3 #include <linux/ipv6.h>
4 #include <linux/netfilter.h>
5 #include <linux/netfilter_ipv6.h>
6 #include <net/dst.h>
7 #include <net/ipv6.h>
8 #include <net/ip6_route.h>
9 #include <net/xfrm.h>
10
11 int ip6_route_me_harder(struct sk_buff *skb)
12 {
13         struct ipv6hdr *iph = skb->nh.ipv6h;
14         struct dst_entry *dst;
15         struct flowi fl = {
16                 .oif = skb->sk ? skb->sk->sk_bound_dev_if : 0,
17                 .nl_u =
18                 { .ip6_u =
19                   { .daddr = iph->daddr,
20                     .saddr = iph->saddr, } },
21         };
22
23         dst = ip6_route_output(skb->sk, &fl);
24
25 #ifdef CONFIG_XFRM
26         if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
27             xfrm_decode_session(skb, &fl, AF_INET6) == 0)
28                 if (xfrm_lookup(&skb->dst, &fl, skb->sk, 0))
29                         return -1;
30 #endif
31
32         if (dst->error) {
33                 IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
34                 LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n");
35                 dst_release(dst);
36                 return -EINVAL;
37         }
38
39         /* Drop old route. */
40         dst_release(skb->dst);
41
42         skb->dst = dst;
43         return 0;
44 }
45 EXPORT_SYMBOL(ip6_route_me_harder);
46
47 /*
48  * Extra routing may needed on local out, as the QUEUE target never
49  * returns control to the table.
50  */
51
52 struct ip6_rt_info {
53         struct in6_addr daddr;
54         struct in6_addr saddr;
55 };
56
57 static void save(const struct sk_buff *skb, struct nf_info *info)
58 {
59         struct ip6_rt_info *rt_info = nf_info_reroute(info);
60
61         if (info->hook == NF_IP6_LOCAL_OUT) {
62                 struct ipv6hdr *iph = skb->nh.ipv6h;
63
64                 rt_info->daddr = iph->daddr;
65                 rt_info->saddr = iph->saddr;
66         }
67 }
68
69 static int reroute(struct sk_buff **pskb, const struct nf_info *info)
70 {
71         struct ip6_rt_info *rt_info = nf_info_reroute(info);
72
73         if (info->hook == NF_IP6_LOCAL_OUT) {
74                 struct ipv6hdr *iph = (*pskb)->nh.ipv6h;
75                 if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
76                     !ipv6_addr_equal(&iph->saddr, &rt_info->saddr))
77                         return ip6_route_me_harder(*pskb);
78         }
79         return 0;
80 }
81
82 static struct nf_queue_rerouter ip6_reroute = {
83         .rer_size       = sizeof(struct ip6_rt_info),
84         .save           = &save,
85         .reroute        = &reroute,
86 };
87
88 int __init ipv6_netfilter_init(void)
89 {
90         return nf_register_queue_rerouter(PF_INET6, &ip6_reroute);
91 }
92
93 /* This can be called from inet6_init() on errors, so it cannot
94  * be marked __exit. -DaveM
95  */
96 void ipv6_netfilter_fini(void)
97 {
98         nf_unregister_queue_rerouter(PF_INET6);
99 }