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Commit | Line | Data |
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020b4c12 | 1 | #include <linux/kernel.h> |
bb94aa16 | 2 | #include <linux/init.h> |
020b4c12 | 3 | #include <linux/ipv6.h> |
2cc7d573 HW |
4 | #include <linux/netfilter.h> |
5 | #include <linux/netfilter_ipv6.h> | |
020b4c12 HW |
6 | #include <net/dst.h> |
7 | #include <net/ipv6.h> | |
8 | #include <net/ip6_route.h> | |
3e3850e9 | 9 | #include <net/xfrm.h> |
503e4faa | 10 | #include <net/ip6_checksum.h> |
020b4c12 HW |
11 | |
12 | int ip6_route_me_harder(struct sk_buff *skb) | |
13 | { | |
14 | struct ipv6hdr *iph = skb->nh.ipv6h; | |
15 | struct dst_entry *dst; | |
16 | struct flowi fl = { | |
17 | .oif = skb->sk ? skb->sk->sk_bound_dev_if : 0, | |
18 | .nl_u = | |
19 | { .ip6_u = | |
20 | { .daddr = iph->daddr, | |
21 | .saddr = iph->saddr, } }, | |
020b4c12 HW |
22 | }; |
23 | ||
24 | dst = ip6_route_output(skb->sk, &fl); | |
25 | ||
3e3850e9 PM |
26 | #ifdef CONFIG_XFRM |
27 | if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) && | |
28 | xfrm_decode_session(skb, &fl, AF_INET6) == 0) | |
29 | if (xfrm_lookup(&skb->dst, &fl, skb->sk, 0)) | |
30 | return -1; | |
31 | #endif | |
32 | ||
020b4c12 HW |
33 | if (dst->error) { |
34 | IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES); | |
64ce2073 | 35 | LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n"); |
020b4c12 HW |
36 | dst_release(dst); |
37 | return -EINVAL; | |
38 | } | |
39 | ||
40 | /* Drop old route. */ | |
41 | dst_release(skb->dst); | |
42 | ||
43 | skb->dst = dst; | |
44 | return 0; | |
45 | } | |
46 | EXPORT_SYMBOL(ip6_route_me_harder); | |
47 | ||
2cc7d573 HW |
48 | /* |
49 | * Extra routing may needed on local out, as the QUEUE target never | |
50 | * returns control to the table. | |
51 | */ | |
52 | ||
53 | struct ip6_rt_info { | |
54 | struct in6_addr daddr; | |
55 | struct in6_addr saddr; | |
56 | }; | |
57 | ||
bce8032e | 58 | static void nf_ip6_saveroute(const struct sk_buff *skb, struct nf_info *info) |
2cc7d573 HW |
59 | { |
60 | struct ip6_rt_info *rt_info = nf_info_reroute(info); | |
61 | ||
62 | if (info->hook == NF_IP6_LOCAL_OUT) { | |
63 | struct ipv6hdr *iph = skb->nh.ipv6h; | |
64 | ||
65 | rt_info->daddr = iph->daddr; | |
66 | rt_info->saddr = iph->saddr; | |
67 | } | |
68 | } | |
69 | ||
bce8032e | 70 | static int nf_ip6_reroute(struct sk_buff **pskb, const struct nf_info *info) |
2cc7d573 HW |
71 | { |
72 | struct ip6_rt_info *rt_info = nf_info_reroute(info); | |
73 | ||
74 | if (info->hook == NF_IP6_LOCAL_OUT) { | |
75 | struct ipv6hdr *iph = (*pskb)->nh.ipv6h; | |
76 | if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) || | |
77 | !ipv6_addr_equal(&iph->saddr, &rt_info->saddr)) | |
78 | return ip6_route_me_harder(*pskb); | |
79 | } | |
80 | return 0; | |
81 | } | |
82 | ||
422c346f PM |
83 | unsigned int nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, |
84 | unsigned int dataoff, u_int8_t protocol) | |
85 | { | |
86 | struct ipv6hdr *ip6h = skb->nh.ipv6h; | |
87 | unsigned int csum = 0; | |
88 | ||
89 | switch (skb->ip_summed) { | |
90 | case CHECKSUM_HW: | |
91 | if (hook != NF_IP6_PRE_ROUTING && hook != NF_IP6_LOCAL_IN) | |
92 | break; | |
93 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
94 | skb->len - dataoff, protocol, | |
95 | csum_sub(skb->csum, | |
96 | skb_checksum(skb, 0, | |
97 | dataoff, 0)))) { | |
98 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
99 | break; | |
100 | } | |
101 | /* fall through */ | |
102 | case CHECKSUM_NONE: | |
103 | skb->csum = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
104 | skb->len - dataoff, | |
105 | protocol, | |
106 | csum_sub(0, | |
107 | skb_checksum(skb, 0, | |
108 | dataoff, 0))); | |
109 | csum = __skb_checksum_complete(skb); | |
110 | } | |
111 | return csum; | |
112 | } | |
113 | ||
114 | EXPORT_SYMBOL(nf_ip6_checksum); | |
115 | ||
bce8032e PM |
116 | static struct nf_afinfo nf_ip6_afinfo = { |
117 | .family = AF_INET6, | |
422c346f | 118 | .checksum = nf_ip6_checksum, |
bce8032e PM |
119 | .saveroute = nf_ip6_saveroute, |
120 | .reroute = nf_ip6_reroute, | |
121 | .route_key_size = sizeof(struct ip6_rt_info), | |
2cc7d573 HW |
122 | }; |
123 | ||
124 | int __init ipv6_netfilter_init(void) | |
125 | { | |
bce8032e | 126 | return nf_register_afinfo(&nf_ip6_afinfo); |
2cc7d573 HW |
127 | } |
128 | ||
5bf887f2 DM |
129 | /* This can be called from inet6_init() on errors, so it cannot |
130 | * be marked __exit. -DaveM | |
131 | */ | |
132 | void ipv6_netfilter_fini(void) | |
2cc7d573 | 133 | { |
bce8032e | 134 | nf_unregister_afinfo(&nf_ip6_afinfo); |
2cc7d573 | 135 | } |