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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); |
b71d1d42 | 16 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
020b4c12 | 17 | struct dst_entry *dst; |
4c9483b2 DM |
18 | struct flowi6 fl6 = { |
19 | .flowi6_oif = skb->sk ? skb->sk->sk_bound_dev_if : 0, | |
20 | .flowi6_mark = skb->mark, | |
21 | .daddr = iph->daddr, | |
22 | .saddr = iph->saddr, | |
020b4c12 HW |
23 | }; |
24 | ||
4c9483b2 | 25 | dst = ip6_route_output(net, skb->sk, &fl6); |
020b4c12 | 26 | if (dst->error) { |
eef9d90d | 27 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
64ce2073 | 28 | LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n"); |
020b4c12 HW |
29 | dst_release(dst); |
30 | return -EINVAL; | |
31 | } | |
32 | ||
33 | /* Drop old route. */ | |
adf30907 | 34 | skb_dst_drop(skb); |
020b4c12 | 35 | |
adf30907 | 36 | skb_dst_set(skb, dst); |
90348e0e UW |
37 | |
38 | #ifdef CONFIG_XFRM | |
39 | if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) && | |
4c9483b2 | 40 | xfrm_decode_session(skb, flowi6_to_flowi(&fl6), AF_INET6) == 0) { |
90348e0e | 41 | skb_dst_set(skb, NULL); |
4c9483b2 | 42 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), skb->sk, 0); |
452edd59 | 43 | if (IS_ERR(dst)) |
90348e0e UW |
44 | return -1; |
45 | skb_dst_set(skb, dst); | |
46 | } | |
47 | #endif | |
48 | ||
020b4c12 HW |
49 | return 0; |
50 | } | |
51 | EXPORT_SYMBOL(ip6_route_me_harder); | |
52 | ||
2cc7d573 HW |
53 | /* |
54 | * Extra routing may needed on local out, as the QUEUE target never | |
55 | * returns control to the table. | |
56 | */ | |
57 | ||
58 | struct ip6_rt_info { | |
59 | struct in6_addr daddr; | |
60 | struct in6_addr saddr; | |
9f40ac71 | 61 | u_int32_t mark; |
2cc7d573 HW |
62 | }; |
63 | ||
02f014d8 PM |
64 | static void nf_ip6_saveroute(const struct sk_buff *skb, |
65 | struct nf_queue_entry *entry) | |
2cc7d573 | 66 | { |
02f014d8 | 67 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
2cc7d573 | 68 | |
02f014d8 | 69 | if (entry->hook == NF_INET_LOCAL_OUT) { |
b71d1d42 | 70 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
2cc7d573 HW |
71 | |
72 | rt_info->daddr = iph->daddr; | |
73 | rt_info->saddr = iph->saddr; | |
9f40ac71 | 74 | rt_info->mark = skb->mark; |
2cc7d573 HW |
75 | } |
76 | } | |
77 | ||
02f014d8 PM |
78 | static int nf_ip6_reroute(struct sk_buff *skb, |
79 | const struct nf_queue_entry *entry) | |
2cc7d573 | 80 | { |
02f014d8 | 81 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
2cc7d573 | 82 | |
02f014d8 | 83 | if (entry->hook == NF_INET_LOCAL_OUT) { |
b71d1d42 | 84 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
2cc7d573 | 85 | if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) || |
9f40ac71 EL |
86 | !ipv6_addr_equal(&iph->saddr, &rt_info->saddr) || |
87 | skb->mark != rt_info->mark) | |
3db05fea | 88 | return ip6_route_me_harder(skb); |
2cc7d573 HW |
89 | } |
90 | return 0; | |
91 | } | |
92 | ||
31ad3dd6 | 93 | static int nf_ip6_route(struct net *net, struct dst_entry **dst, |
0fae2e77 | 94 | struct flowi *fl, bool strict) |
1841a4c7 | 95 | { |
0fae2e77 FW |
96 | static const struct ipv6_pinfo fake_pinfo; |
97 | static const struct inet_sock fake_sk = { | |
98 | /* makes ip6_route_output set RT6_LOOKUP_F_IFACE: */ | |
99 | .sk.sk_bound_dev_if = 1, | |
100 | .pinet6 = (struct ipv6_pinfo *) &fake_pinfo, | |
101 | }; | |
102 | const void *sk = strict ? &fake_sk : NULL; | |
103 | ||
104 | *dst = ip6_route_output(net, sk, &fl->u.ip6); | |
1841a4c7 PM |
105 | return (*dst)->error; |
106 | } | |
107 | ||
b51655b9 | 108 | __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, |
422c346f PM |
109 | unsigned int dataoff, u_int8_t protocol) |
110 | { | |
b71d1d42 | 111 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
b51655b9 | 112 | __sum16 csum = 0; |
422c346f PM |
113 | |
114 | switch (skb->ip_summed) { | |
84fa7933 | 115 | case CHECKSUM_COMPLETE: |
6e23ae2a | 116 | if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN) |
422c346f PM |
117 | break; |
118 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
1ab1457c | 119 | skb->len - dataoff, protocol, |
422c346f PM |
120 | csum_sub(skb->csum, |
121 | skb_checksum(skb, 0, | |
122 | dataoff, 0)))) { | |
123 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
124 | break; | |
125 | } | |
126 | /* fall through */ | |
127 | case CHECKSUM_NONE: | |
868c86bc AV |
128 | skb->csum = ~csum_unfold( |
129 | csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
422c346f PM |
130 | skb->len - dataoff, |
131 | protocol, | |
132 | csum_sub(0, | |
133 | skb_checksum(skb, 0, | |
1ab1457c | 134 | dataoff, 0)))); |
422c346f PM |
135 | csum = __skb_checksum_complete(skb); |
136 | } | |
137 | return csum; | |
138 | } | |
422c346f PM |
139 | EXPORT_SYMBOL(nf_ip6_checksum); |
140 | ||
d63a6507 PM |
141 | static __sum16 nf_ip6_checksum_partial(struct sk_buff *skb, unsigned int hook, |
142 | unsigned int dataoff, unsigned int len, | |
143 | u_int8_t protocol) | |
144 | { | |
b71d1d42 | 145 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
d63a6507 PM |
146 | __wsum hsum; |
147 | __sum16 csum = 0; | |
148 | ||
149 | switch (skb->ip_summed) { | |
150 | case CHECKSUM_COMPLETE: | |
151 | if (len == skb->len - dataoff) | |
152 | return nf_ip6_checksum(skb, hook, dataoff, protocol); | |
153 | /* fall through */ | |
154 | case CHECKSUM_NONE: | |
155 | hsum = skb_checksum(skb, 0, dataoff, 0); | |
156 | skb->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, | |
157 | &ip6h->daddr, | |
158 | skb->len - dataoff, | |
159 | protocol, | |
160 | csum_sub(0, hsum))); | |
161 | skb->ip_summed = CHECKSUM_NONE; | |
c86ee67c | 162 | return __skb_checksum_complete_head(skb, dataoff + len); |
d63a6507 PM |
163 | } |
164 | return csum; | |
165 | }; | |
166 | ||
1e796fda | 167 | static const struct nf_afinfo nf_ip6_afinfo = { |
d63a6507 PM |
168 | .family = AF_INET6, |
169 | .checksum = nf_ip6_checksum, | |
170 | .checksum_partial = nf_ip6_checksum_partial, | |
171 | .route = nf_ip6_route, | |
172 | .saveroute = nf_ip6_saveroute, | |
173 | .reroute = nf_ip6_reroute, | |
174 | .route_key_size = sizeof(struct ip6_rt_info), | |
2cc7d573 HW |
175 | }; |
176 | ||
177 | int __init ipv6_netfilter_init(void) | |
178 | { | |
bce8032e | 179 | return nf_register_afinfo(&nf_ip6_afinfo); |
2cc7d573 HW |
180 | } |
181 | ||
5bf887f2 DM |
182 | /* This can be called from inet6_init() on errors, so it cannot |
183 | * be marked __exit. -DaveM | |
184 | */ | |
185 | void ipv6_netfilter_fini(void) | |
2cc7d573 | 186 | { |
bce8032e | 187 | nf_unregister_afinfo(&nf_ip6_afinfo); |
2cc7d573 | 188 | } |