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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> | |
13 | ||
14 | int ip6_route_me_harder(struct sk_buff *skb) | |
15 | { | |
16 | struct ipv6hdr *iph = skb->nh.ipv6h; | |
17 | struct dst_entry *dst; | |
18 | struct flowi fl = { | |
19 | .oif = skb->sk ? skb->sk->sk_bound_dev_if : 0, | |
20 | .nl_u = | |
21 | { .ip6_u = | |
22 | { .daddr = iph->daddr, | |
23 | .saddr = iph->saddr, } }, | |
24 | .proto = iph->nexthdr, | |
25 | }; | |
26 | ||
27 | dst = ip6_route_output(skb->sk, &fl); | |
28 | ||
29 | if (dst->error) { | |
30 | IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES); | |
31 | LIMIT_NETDEBUG( | |
32 | printk(KERN_DEBUG "ip6_route_me_harder: No more route.\n")); | |
33 | dst_release(dst); | |
34 | return -EINVAL; | |
35 | } | |
36 | ||
37 | /* Drop old route. */ | |
38 | dst_release(skb->dst); | |
39 | ||
40 | skb->dst = dst; | |
41 | return 0; | |
42 | } | |
43 | EXPORT_SYMBOL(ip6_route_me_harder); | |
44 | ||
2cc7d573 HW |
45 | /* |
46 | * Extra routing may needed on local out, as the QUEUE target never | |
47 | * returns control to the table. | |
48 | */ | |
49 | ||
50 | struct ip6_rt_info { | |
51 | struct in6_addr daddr; | |
52 | struct in6_addr saddr; | |
53 | }; | |
54 | ||
55 | static void save(const struct sk_buff *skb, struct nf_info *info) | |
56 | { | |
57 | struct ip6_rt_info *rt_info = nf_info_reroute(info); | |
58 | ||
59 | if (info->hook == NF_IP6_LOCAL_OUT) { | |
60 | struct ipv6hdr *iph = skb->nh.ipv6h; | |
61 | ||
62 | rt_info->daddr = iph->daddr; | |
63 | rt_info->saddr = iph->saddr; | |
64 | } | |
65 | } | |
66 | ||
67 | static int reroute(struct sk_buff **pskb, const struct nf_info *info) | |
68 | { | |
69 | struct ip6_rt_info *rt_info = nf_info_reroute(info); | |
70 | ||
71 | if (info->hook == NF_IP6_LOCAL_OUT) { | |
72 | struct ipv6hdr *iph = (*pskb)->nh.ipv6h; | |
73 | if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) || | |
74 | !ipv6_addr_equal(&iph->saddr, &rt_info->saddr)) | |
75 | return ip6_route_me_harder(*pskb); | |
76 | } | |
77 | return 0; | |
78 | } | |
79 | ||
80 | static struct nf_queue_rerouter ip6_reroute = { | |
81 | .rer_size = sizeof(struct ip6_rt_info), | |
82 | .save = &save, | |
83 | .reroute = &reroute, | |
84 | }; | |
85 | ||
86 | int __init ipv6_netfilter_init(void) | |
87 | { | |
88 | return nf_register_queue_rerouter(PF_INET6, &ip6_reroute); | |
89 | } | |
90 | ||
91 | void ipv6_netfilter_fini(void) | |
92 | { | |
93 | nf_unregister_queue_rerouter(PF_INET6); | |
94 | } | |
95 | ||
96 | #else /* CONFIG_NETFILTER */ | |
97 | int __init ipv6_netfilter_init(void) | |
98 | { | |
99 | return 0; | |
100 | } | |
101 | ||
102 | void ipv6_netfilter_fini(void) | |
103 | { | |
104 | } | |
020b4c12 | 105 | #endif /* CONFIG_NETFILTER */ |