Commit | Line | Data |
---|---|---|
020b4c12 HW |
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> | |
2cc7d573 HW |
8 | #include <linux/netfilter.h> |
9 | #include <linux/netfilter_ipv6.h> | |
020b4c12 HW |
10 | #include <net/dst.h> |
11 | #include <net/ipv6.h> | |
12 | #include <net/ip6_route.h> | |
3e3850e9 | 13 | #include <net/xfrm.h> |
020b4c12 HW |
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, } }, | |
020b4c12 HW |
25 | }; |
26 | ||
27 | dst = ip6_route_output(skb->sk, &fl); | |
28 | ||
3e3850e9 PM |
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 | ||
020b4c12 HW |
36 | if (dst->error) { |
37 | IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES); | |
64ce2073 | 38 | LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n"); |
020b4c12 HW |
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 | ||
2cc7d573 HW |
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 | } | |
020b4c12 | 111 | #endif /* CONFIG_NETFILTER */ |