Commit | Line | Data |
---|---|---|
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> | |
bc3b2d7f | 6 | #include <linux/export.h> |
020b4c12 HW |
7 | #include <net/dst.h> |
8 | #include <net/ipv6.h> | |
9 | #include <net/ip6_route.h> | |
3e3850e9 | 10 | #include <net/xfrm.h> |
503e4faa | 11 | #include <net/ip6_checksum.h> |
c01cd429 | 12 | #include <net/netfilter/nf_queue.h> |
020b4c12 HW |
13 | |
14 | int ip6_route_me_harder(struct sk_buff *skb) | |
15 | { | |
adf30907 | 16 | struct net *net = dev_net(skb_dst(skb)->dev); |
b71d1d42 | 17 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
020b4c12 | 18 | struct dst_entry *dst; |
4c9483b2 DM |
19 | struct flowi6 fl6 = { |
20 | .flowi6_oif = skb->sk ? skb->sk->sk_bound_dev_if : 0, | |
21 | .flowi6_mark = skb->mark, | |
22 | .daddr = iph->daddr, | |
23 | .saddr = iph->saddr, | |
020b4c12 HW |
24 | }; |
25 | ||
4c9483b2 | 26 | dst = ip6_route_output(net, skb->sk, &fl6); |
020b4c12 | 27 | if (dst->error) { |
eef9d90d | 28 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
64ce2073 | 29 | LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n"); |
020b4c12 HW |
30 | dst_release(dst); |
31 | return -EINVAL; | |
32 | } | |
33 | ||
34 | /* Drop old route. */ | |
adf30907 | 35 | skb_dst_drop(skb); |
020b4c12 | 36 | |
adf30907 | 37 | skb_dst_set(skb, dst); |
90348e0e UW |
38 | |
39 | #ifdef CONFIG_XFRM | |
40 | if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) && | |
4c9483b2 | 41 | xfrm_decode_session(skb, flowi6_to_flowi(&fl6), AF_INET6) == 0) { |
90348e0e | 42 | skb_dst_set(skb, NULL); |
4c9483b2 | 43 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), skb->sk, 0); |
452edd59 | 44 | if (IS_ERR(dst)) |
90348e0e UW |
45 | return -1; |
46 | skb_dst_set(skb, dst); | |
47 | } | |
48 | #endif | |
49 | ||
020b4c12 HW |
50 | return 0; |
51 | } | |
52 | EXPORT_SYMBOL(ip6_route_me_harder); | |
53 | ||
2cc7d573 HW |
54 | /* |
55 | * Extra routing may needed on local out, as the QUEUE target never | |
56 | * returns control to the table. | |
57 | */ | |
58 | ||
59 | struct ip6_rt_info { | |
60 | struct in6_addr daddr; | |
61 | struct in6_addr saddr; | |
9f40ac71 | 62 | u_int32_t mark; |
2cc7d573 HW |
63 | }; |
64 | ||
02f014d8 PM |
65 | static void nf_ip6_saveroute(const struct sk_buff *skb, |
66 | struct nf_queue_entry *entry) | |
2cc7d573 | 67 | { |
02f014d8 | 68 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
2cc7d573 | 69 | |
02f014d8 | 70 | if (entry->hook == NF_INET_LOCAL_OUT) { |
b71d1d42 | 71 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
2cc7d573 HW |
72 | |
73 | rt_info->daddr = iph->daddr; | |
74 | rt_info->saddr = iph->saddr; | |
9f40ac71 | 75 | rt_info->mark = skb->mark; |
2cc7d573 HW |
76 | } |
77 | } | |
78 | ||
02f014d8 PM |
79 | static int nf_ip6_reroute(struct sk_buff *skb, |
80 | const struct nf_queue_entry *entry) | |
2cc7d573 | 81 | { |
02f014d8 | 82 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
2cc7d573 | 83 | |
02f014d8 | 84 | if (entry->hook == NF_INET_LOCAL_OUT) { |
b71d1d42 | 85 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
2cc7d573 | 86 | if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) || |
9f40ac71 EL |
87 | !ipv6_addr_equal(&iph->saddr, &rt_info->saddr) || |
88 | skb->mark != rt_info->mark) | |
3db05fea | 89 | return ip6_route_me_harder(skb); |
2cc7d573 HW |
90 | } |
91 | return 0; | |
92 | } | |
93 | ||
31ad3dd6 | 94 | static int nf_ip6_route(struct net *net, struct dst_entry **dst, |
0fae2e77 | 95 | struct flowi *fl, bool strict) |
1841a4c7 | 96 | { |
0fae2e77 FW |
97 | static const struct ipv6_pinfo fake_pinfo; |
98 | static const struct inet_sock fake_sk = { | |
99 | /* makes ip6_route_output set RT6_LOOKUP_F_IFACE: */ | |
100 | .sk.sk_bound_dev_if = 1, | |
101 | .pinet6 = (struct ipv6_pinfo *) &fake_pinfo, | |
102 | }; | |
103 | const void *sk = strict ? &fake_sk : NULL; | |
2dad81ad FW |
104 | struct dst_entry *result; |
105 | int err; | |
106 | ||
107 | result = ip6_route_output(net, sk, &fl->u.ip6); | |
108 | err = result->error; | |
109 | if (err) | |
110 | dst_release(result); | |
111 | else | |
112 | *dst = result; | |
113 | return err; | |
1841a4c7 PM |
114 | } |
115 | ||
b51655b9 | 116 | __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, |
422c346f PM |
117 | unsigned int dataoff, u_int8_t protocol) |
118 | { | |
b71d1d42 | 119 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
b51655b9 | 120 | __sum16 csum = 0; |
422c346f PM |
121 | |
122 | switch (skb->ip_summed) { | |
84fa7933 | 123 | case CHECKSUM_COMPLETE: |
6e23ae2a | 124 | if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN) |
422c346f PM |
125 | break; |
126 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
1ab1457c | 127 | skb->len - dataoff, protocol, |
422c346f PM |
128 | csum_sub(skb->csum, |
129 | skb_checksum(skb, 0, | |
130 | dataoff, 0)))) { | |
131 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
132 | break; | |
133 | } | |
134 | /* fall through */ | |
135 | case CHECKSUM_NONE: | |
868c86bc AV |
136 | skb->csum = ~csum_unfold( |
137 | csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
422c346f PM |
138 | skb->len - dataoff, |
139 | protocol, | |
140 | csum_sub(0, | |
141 | skb_checksum(skb, 0, | |
1ab1457c | 142 | dataoff, 0)))); |
422c346f PM |
143 | csum = __skb_checksum_complete(skb); |
144 | } | |
145 | return csum; | |
146 | } | |
422c346f PM |
147 | EXPORT_SYMBOL(nf_ip6_checksum); |
148 | ||
d63a6507 PM |
149 | static __sum16 nf_ip6_checksum_partial(struct sk_buff *skb, unsigned int hook, |
150 | unsigned int dataoff, unsigned int len, | |
151 | u_int8_t protocol) | |
152 | { | |
b71d1d42 | 153 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
d63a6507 PM |
154 | __wsum hsum; |
155 | __sum16 csum = 0; | |
156 | ||
157 | switch (skb->ip_summed) { | |
158 | case CHECKSUM_COMPLETE: | |
159 | if (len == skb->len - dataoff) | |
160 | return nf_ip6_checksum(skb, hook, dataoff, protocol); | |
161 | /* fall through */ | |
162 | case CHECKSUM_NONE: | |
163 | hsum = skb_checksum(skb, 0, dataoff, 0); | |
164 | skb->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, | |
165 | &ip6h->daddr, | |
166 | skb->len - dataoff, | |
167 | protocol, | |
168 | csum_sub(0, hsum))); | |
169 | skb->ip_summed = CHECKSUM_NONE; | |
c86ee67c | 170 | return __skb_checksum_complete_head(skb, dataoff + len); |
d63a6507 PM |
171 | } |
172 | return csum; | |
173 | }; | |
174 | ||
1e796fda | 175 | static const struct nf_afinfo nf_ip6_afinfo = { |
d63a6507 PM |
176 | .family = AF_INET6, |
177 | .checksum = nf_ip6_checksum, | |
178 | .checksum_partial = nf_ip6_checksum_partial, | |
179 | .route = nf_ip6_route, | |
180 | .saveroute = nf_ip6_saveroute, | |
181 | .reroute = nf_ip6_reroute, | |
182 | .route_key_size = sizeof(struct ip6_rt_info), | |
2cc7d573 HW |
183 | }; |
184 | ||
185 | int __init ipv6_netfilter_init(void) | |
186 | { | |
bce8032e | 187 | return nf_register_afinfo(&nf_ip6_afinfo); |
2cc7d573 HW |
188 | } |
189 | ||
5bf887f2 DM |
190 | /* This can be called from inet6_init() on errors, so it cannot |
191 | * be marked __exit. -DaveM | |
192 | */ | |
193 | void ipv6_netfilter_fini(void) | |
2cc7d573 | 194 | { |
bce8032e | 195 | nf_unregister_afinfo(&nf_ip6_afinfo); |
2cc7d573 | 196 | } |