Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc-merge
[linux-2.6] / net / ipv6 / netfilter.c
1 #include <linux/config.h>
2 #include <linux/init.h>
3
4 #ifdef CONFIG_NETFILTER
5
6 #include <linux/kernel.h>
7 #include <linux/ipv6.h>
8 #include <linux/netfilter.h>
9 #include <linux/netfilter_ipv6.h>
10 #include <net/dst.h>
11 #include <net/ipv6.h>
12 #include <net/ip6_route.h>
13 #include <net/xfrm.h>
14
15 int ip6_route_me_harder(struct sk_buff *skb)
16 {
17         struct ipv6hdr *iph = skb->nh.ipv6h;
18         struct dst_entry *dst;
19         struct flowi fl = {
20                 .oif = skb->sk ? skb->sk->sk_bound_dev_if : 0,
21                 .nl_u =
22                 { .ip6_u =
23                   { .daddr = iph->daddr,
24                     .saddr = iph->saddr, } },
25         };
26
27         dst = ip6_route_output(skb->sk, &fl);
28
29 #ifdef CONFIG_XFRM
30         if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
31             xfrm_decode_session(skb, &fl, AF_INET6) == 0)
32                 if (xfrm_lookup(&skb->dst, &fl, skb->sk, 0))
33                         return -1;
34 #endif
35
36         if (dst->error) {
37                 IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
38                 LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n");
39                 dst_release(dst);
40                 return -EINVAL;
41         }
42
43         /* Drop old route. */
44         dst_release(skb->dst);
45
46         skb->dst = dst;
47         return 0;
48 }
49 EXPORT_SYMBOL(ip6_route_me_harder);
50
51 /*
52  * Extra routing may needed on local out, as the QUEUE target never
53  * returns control to the table.
54  */
55
56 struct ip6_rt_info {
57         struct in6_addr daddr;
58         struct in6_addr saddr;
59 };
60
61 static void save(const struct sk_buff *skb, struct nf_info *info)
62 {
63         struct ip6_rt_info *rt_info = nf_info_reroute(info);
64
65         if (info->hook == NF_IP6_LOCAL_OUT) {
66                 struct ipv6hdr *iph = skb->nh.ipv6h;
67
68                 rt_info->daddr = iph->daddr;
69                 rt_info->saddr = iph->saddr;
70         }
71 }
72
73 static int reroute(struct sk_buff **pskb, const struct nf_info *info)
74 {
75         struct ip6_rt_info *rt_info = nf_info_reroute(info);
76
77         if (info->hook == NF_IP6_LOCAL_OUT) {
78                 struct ipv6hdr *iph = (*pskb)->nh.ipv6h;
79                 if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
80                     !ipv6_addr_equal(&iph->saddr, &rt_info->saddr))
81                         return ip6_route_me_harder(*pskb);
82         }
83         return 0;
84 }
85
86 static struct nf_queue_rerouter ip6_reroute = {
87         .rer_size       = sizeof(struct ip6_rt_info),
88         .save           = &save,
89         .reroute        = &reroute,
90 };
91
92 int __init ipv6_netfilter_init(void)
93 {
94         return nf_register_queue_rerouter(PF_INET6, &ip6_reroute);
95 }
96
97 void ipv6_netfilter_fini(void)
98 {
99         nf_unregister_queue_rerouter(PF_INET6);
100 }
101
102 #else /* CONFIG_NETFILTER */
103 int __init ipv6_netfilter_init(void)
104 {
105         return 0;
106 }
107
108 void ipv6_netfilter_fini(void)
109 {
110 }
111 #endif /* CONFIG_NETFILTER */