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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 | { | |
adf30907 | 15 | struct net *net = dev_net(skb_dst(skb)->dev); |
0660e03f | 16 | struct ipv6hdr *iph = ipv6_hdr(skb); |
020b4c12 HW |
17 | struct dst_entry *dst; |
18 | struct flowi fl = { | |
19 | .oif = skb->sk ? skb->sk->sk_bound_dev_if : 0, | |
bc5f7743 | 20 | .mark = skb->mark, |
020b4c12 HW |
21 | .nl_u = |
22 | { .ip6_u = | |
23 | { .daddr = iph->daddr, | |
24 | .saddr = iph->saddr, } }, | |
020b4c12 HW |
25 | }; |
26 | ||
eef9d90d | 27 | dst = ip6_route_output(net, skb->sk, &fl); |
020b4c12 | 28 | |
3e3850e9 PM |
29 | #ifdef CONFIG_XFRM |
30 | if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) && | |
adf30907 ED |
31 | xfrm_decode_session(skb, &fl, AF_INET6) == 0) { |
32 | struct dst_entry *dst2 = skb_dst(skb); | |
33 | ||
34 | if (xfrm_lookup(net, &dst2, &fl, skb->sk, 0)) { | |
35 | skb_dst_set(skb, NULL); | |
3e3850e9 | 36 | return -1; |
adf30907 ED |
37 | } |
38 | skb_dst_set(skb, dst2); | |
39 | } | |
3e3850e9 PM |
40 | #endif |
41 | ||
020b4c12 | 42 | if (dst->error) { |
eef9d90d | 43 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
64ce2073 | 44 | LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n"); |
020b4c12 HW |
45 | dst_release(dst); |
46 | return -EINVAL; | |
47 | } | |
48 | ||
49 | /* Drop old route. */ | |
adf30907 | 50 | skb_dst_drop(skb); |
020b4c12 | 51 | |
adf30907 | 52 | skb_dst_set(skb, dst); |
020b4c12 HW |
53 | return 0; |
54 | } | |
55 | EXPORT_SYMBOL(ip6_route_me_harder); | |
56 | ||
2cc7d573 HW |
57 | /* |
58 | * Extra routing may needed on local out, as the QUEUE target never | |
59 | * returns control to the table. | |
60 | */ | |
61 | ||
62 | struct ip6_rt_info { | |
63 | struct in6_addr daddr; | |
64 | struct in6_addr saddr; | |
9f40ac71 | 65 | u_int32_t mark; |
2cc7d573 HW |
66 | }; |
67 | ||
02f014d8 PM |
68 | static void nf_ip6_saveroute(const struct sk_buff *skb, |
69 | struct nf_queue_entry *entry) | |
2cc7d573 | 70 | { |
02f014d8 | 71 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
2cc7d573 | 72 | |
02f014d8 | 73 | if (entry->hook == NF_INET_LOCAL_OUT) { |
0660e03f | 74 | struct ipv6hdr *iph = ipv6_hdr(skb); |
2cc7d573 HW |
75 | |
76 | rt_info->daddr = iph->daddr; | |
77 | rt_info->saddr = iph->saddr; | |
9f40ac71 | 78 | rt_info->mark = skb->mark; |
2cc7d573 HW |
79 | } |
80 | } | |
81 | ||
02f014d8 PM |
82 | static int nf_ip6_reroute(struct sk_buff *skb, |
83 | const struct nf_queue_entry *entry) | |
2cc7d573 | 84 | { |
02f014d8 | 85 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
2cc7d573 | 86 | |
02f014d8 | 87 | if (entry->hook == NF_INET_LOCAL_OUT) { |
3db05fea | 88 | struct ipv6hdr *iph = ipv6_hdr(skb); |
2cc7d573 | 89 | if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) || |
9f40ac71 EL |
90 | !ipv6_addr_equal(&iph->saddr, &rt_info->saddr) || |
91 | skb->mark != rt_info->mark) | |
3db05fea | 92 | return ip6_route_me_harder(skb); |
2cc7d573 HW |
93 | } |
94 | return 0; | |
95 | } | |
96 | ||
1841a4c7 PM |
97 | static int nf_ip6_route(struct dst_entry **dst, struct flowi *fl) |
98 | { | |
4591db4f | 99 | *dst = ip6_route_output(&init_net, NULL, fl); |
1841a4c7 PM |
100 | return (*dst)->error; |
101 | } | |
102 | ||
b51655b9 | 103 | __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, |
422c346f PM |
104 | unsigned int dataoff, u_int8_t protocol) |
105 | { | |
0660e03f | 106 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
b51655b9 | 107 | __sum16 csum = 0; |
422c346f PM |
108 | |
109 | switch (skb->ip_summed) { | |
84fa7933 | 110 | case CHECKSUM_COMPLETE: |
6e23ae2a | 111 | if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN) |
422c346f PM |
112 | break; |
113 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
1ab1457c | 114 | skb->len - dataoff, protocol, |
422c346f PM |
115 | csum_sub(skb->csum, |
116 | skb_checksum(skb, 0, | |
117 | dataoff, 0)))) { | |
118 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
119 | break; | |
120 | } | |
121 | /* fall through */ | |
122 | case CHECKSUM_NONE: | |
868c86bc AV |
123 | skb->csum = ~csum_unfold( |
124 | csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
422c346f PM |
125 | skb->len - dataoff, |
126 | protocol, | |
127 | csum_sub(0, | |
128 | skb_checksum(skb, 0, | |
1ab1457c | 129 | dataoff, 0)))); |
422c346f PM |
130 | csum = __skb_checksum_complete(skb); |
131 | } | |
132 | return csum; | |
133 | } | |
422c346f PM |
134 | EXPORT_SYMBOL(nf_ip6_checksum); |
135 | ||
d63a6507 PM |
136 | static __sum16 nf_ip6_checksum_partial(struct sk_buff *skb, unsigned int hook, |
137 | unsigned int dataoff, unsigned int len, | |
138 | u_int8_t protocol) | |
139 | { | |
140 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
141 | __wsum hsum; | |
142 | __sum16 csum = 0; | |
143 | ||
144 | switch (skb->ip_summed) { | |
145 | case CHECKSUM_COMPLETE: | |
146 | if (len == skb->len - dataoff) | |
147 | return nf_ip6_checksum(skb, hook, dataoff, protocol); | |
148 | /* fall through */ | |
149 | case CHECKSUM_NONE: | |
150 | hsum = skb_checksum(skb, 0, dataoff, 0); | |
151 | skb->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, | |
152 | &ip6h->daddr, | |
153 | skb->len - dataoff, | |
154 | protocol, | |
155 | csum_sub(0, hsum))); | |
156 | skb->ip_summed = CHECKSUM_NONE; | |
157 | csum = __skb_checksum_complete_head(skb, dataoff + len); | |
158 | if (!csum) | |
159 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
160 | } | |
161 | return csum; | |
162 | }; | |
163 | ||
1e796fda | 164 | static const struct nf_afinfo nf_ip6_afinfo = { |
d63a6507 PM |
165 | .family = AF_INET6, |
166 | .checksum = nf_ip6_checksum, | |
167 | .checksum_partial = nf_ip6_checksum_partial, | |
168 | .route = nf_ip6_route, | |
169 | .saveroute = nf_ip6_saveroute, | |
170 | .reroute = nf_ip6_reroute, | |
171 | .route_key_size = sizeof(struct ip6_rt_info), | |
2cc7d573 HW |
172 | }; |
173 | ||
174 | int __init ipv6_netfilter_init(void) | |
175 | { | |
bce8032e | 176 | return nf_register_afinfo(&nf_ip6_afinfo); |
2cc7d573 HW |
177 | } |
178 | ||
5bf887f2 DM |
179 | /* This can be called from inet6_init() on errors, so it cannot |
180 | * be marked __exit. -DaveM | |
181 | */ | |
182 | void ipv6_netfilter_fini(void) | |
2cc7d573 | 183 | { |
bce8032e | 184 | nf_unregister_afinfo(&nf_ip6_afinfo); |
2cc7d573 | 185 | } |