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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> |
c01cd429 | 11 | #include <net/netfilter/nf_queue.h> |
020b4c12 HW |
12 | |
13 | int ip6_route_me_harder(struct sk_buff *skb) | |
14 | { | |
0660e03f | 15 | struct ipv6hdr *iph = ipv6_hdr(skb); |
020b4c12 HW |
16 | struct dst_entry *dst; |
17 | struct flowi fl = { | |
18 | .oif = skb->sk ? skb->sk->sk_bound_dev_if : 0, | |
bc5f7743 | 19 | .mark = skb->mark, |
020b4c12 HW |
20 | .nl_u = |
21 | { .ip6_u = | |
22 | { .daddr = iph->daddr, | |
23 | .saddr = iph->saddr, } }, | |
020b4c12 HW |
24 | }; |
25 | ||
b21f8901 | 26 | dst = ip6_route_output(dev_net(skb->dst->dev), skb->sk, &fl); |
020b4c12 | 27 | |
3e3850e9 PM |
28 | #ifdef CONFIG_XFRM |
29 | if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) && | |
30 | xfrm_decode_session(skb, &fl, AF_INET6) == 0) | |
31 | if (xfrm_lookup(&skb->dst, &fl, skb->sk, 0)) | |
32 | return -1; | |
33 | #endif | |
34 | ||
020b4c12 | 35 | if (dst->error) { |
3bd653c8 DL |
36 | IP6_INC_STATS(&init_net, ip6_dst_idev(dst), |
37 | 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 | ||
02f014d8 PM |
61 | static void nf_ip6_saveroute(const struct sk_buff *skb, |
62 | struct nf_queue_entry *entry) | |
2cc7d573 | 63 | { |
02f014d8 | 64 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
2cc7d573 | 65 | |
02f014d8 | 66 | if (entry->hook == NF_INET_LOCAL_OUT) { |
0660e03f | 67 | struct ipv6hdr *iph = ipv6_hdr(skb); |
2cc7d573 HW |
68 | |
69 | rt_info->daddr = iph->daddr; | |
70 | rt_info->saddr = iph->saddr; | |
71 | } | |
72 | } | |
73 | ||
02f014d8 PM |
74 | static int nf_ip6_reroute(struct sk_buff *skb, |
75 | const struct nf_queue_entry *entry) | |
2cc7d573 | 76 | { |
02f014d8 | 77 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
2cc7d573 | 78 | |
02f014d8 | 79 | if (entry->hook == NF_INET_LOCAL_OUT) { |
3db05fea | 80 | struct ipv6hdr *iph = ipv6_hdr(skb); |
2cc7d573 HW |
81 | if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) || |
82 | !ipv6_addr_equal(&iph->saddr, &rt_info->saddr)) | |
3db05fea | 83 | return ip6_route_me_harder(skb); |
2cc7d573 HW |
84 | } |
85 | return 0; | |
86 | } | |
87 | ||
1841a4c7 PM |
88 | static int nf_ip6_route(struct dst_entry **dst, struct flowi *fl) |
89 | { | |
4591db4f | 90 | *dst = ip6_route_output(&init_net, NULL, fl); |
1841a4c7 PM |
91 | return (*dst)->error; |
92 | } | |
93 | ||
b51655b9 | 94 | __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, |
422c346f PM |
95 | unsigned int dataoff, u_int8_t protocol) |
96 | { | |
0660e03f | 97 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
b51655b9 | 98 | __sum16 csum = 0; |
422c346f PM |
99 | |
100 | switch (skb->ip_summed) { | |
84fa7933 | 101 | case CHECKSUM_COMPLETE: |
6e23ae2a | 102 | if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN) |
422c346f PM |
103 | break; |
104 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
1ab1457c | 105 | skb->len - dataoff, protocol, |
422c346f PM |
106 | csum_sub(skb->csum, |
107 | skb_checksum(skb, 0, | |
108 | dataoff, 0)))) { | |
109 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
110 | break; | |
111 | } | |
112 | /* fall through */ | |
113 | case CHECKSUM_NONE: | |
868c86bc AV |
114 | skb->csum = ~csum_unfold( |
115 | csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
422c346f PM |
116 | skb->len - dataoff, |
117 | protocol, | |
118 | csum_sub(0, | |
119 | skb_checksum(skb, 0, | |
1ab1457c | 120 | dataoff, 0)))); |
422c346f PM |
121 | csum = __skb_checksum_complete(skb); |
122 | } | |
123 | return csum; | |
124 | } | |
422c346f PM |
125 | EXPORT_SYMBOL(nf_ip6_checksum); |
126 | ||
d63a6507 PM |
127 | static __sum16 nf_ip6_checksum_partial(struct sk_buff *skb, unsigned int hook, |
128 | unsigned int dataoff, unsigned int len, | |
129 | u_int8_t protocol) | |
130 | { | |
131 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
132 | __wsum hsum; | |
133 | __sum16 csum = 0; | |
134 | ||
135 | switch (skb->ip_summed) { | |
136 | case CHECKSUM_COMPLETE: | |
137 | if (len == skb->len - dataoff) | |
138 | return nf_ip6_checksum(skb, hook, dataoff, protocol); | |
139 | /* fall through */ | |
140 | case CHECKSUM_NONE: | |
141 | hsum = skb_checksum(skb, 0, dataoff, 0); | |
142 | skb->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, | |
143 | &ip6h->daddr, | |
144 | skb->len - dataoff, | |
145 | protocol, | |
146 | csum_sub(0, hsum))); | |
147 | skb->ip_summed = CHECKSUM_NONE; | |
148 | csum = __skb_checksum_complete_head(skb, dataoff + len); | |
149 | if (!csum) | |
150 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
151 | } | |
152 | return csum; | |
153 | }; | |
154 | ||
1e796fda | 155 | static const struct nf_afinfo nf_ip6_afinfo = { |
d63a6507 PM |
156 | .family = AF_INET6, |
157 | .checksum = nf_ip6_checksum, | |
158 | .checksum_partial = nf_ip6_checksum_partial, | |
159 | .route = nf_ip6_route, | |
160 | .saveroute = nf_ip6_saveroute, | |
161 | .reroute = nf_ip6_reroute, | |
162 | .route_key_size = sizeof(struct ip6_rt_info), | |
2cc7d573 HW |
163 | }; |
164 | ||
165 | int __init ipv6_netfilter_init(void) | |
166 | { | |
bce8032e | 167 | return nf_register_afinfo(&nf_ip6_afinfo); |
2cc7d573 HW |
168 | } |
169 | ||
5bf887f2 DM |
170 | /* This can be called from inet6_init() on errors, so it cannot |
171 | * be marked __exit. -DaveM | |
172 | */ | |
173 | void ipv6_netfilter_fini(void) | |
2cc7d573 | 174 | { |
bce8032e | 175 | nf_unregister_afinfo(&nf_ip6_afinfo); |
2cc7d573 | 176 | } |