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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, |
5811662b CG |
21 | .fl6_dst = iph->daddr, |
22 | .fl6_src = iph->saddr, | |
020b4c12 HW |
23 | }; |
24 | ||
eef9d90d | 25 | dst = ip6_route_output(net, skb->sk, &fl); |
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) && | |
40 | xfrm_decode_session(skb, &fl, AF_INET6) == 0) { | |
41 | skb_dst_set(skb, NULL); | |
42 | if (xfrm_lookup(net, &dst, &fl, skb->sk, 0)) | |
43 | return -1; | |
44 | skb_dst_set(skb, dst); | |
45 | } | |
46 | #endif | |
47 | ||
020b4c12 HW |
48 | return 0; |
49 | } | |
50 | EXPORT_SYMBOL(ip6_route_me_harder); | |
51 | ||
2cc7d573 HW |
52 | /* |
53 | * Extra routing may needed on local out, as the QUEUE target never | |
54 | * returns control to the table. | |
55 | */ | |
56 | ||
57 | struct ip6_rt_info { | |
58 | struct in6_addr daddr; | |
59 | struct in6_addr saddr; | |
9f40ac71 | 60 | u_int32_t mark; |
2cc7d573 HW |
61 | }; |
62 | ||
02f014d8 PM |
63 | static void nf_ip6_saveroute(const struct sk_buff *skb, |
64 | struct nf_queue_entry *entry) | |
2cc7d573 | 65 | { |
02f014d8 | 66 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
2cc7d573 | 67 | |
02f014d8 | 68 | if (entry->hook == NF_INET_LOCAL_OUT) { |
0660e03f | 69 | struct ipv6hdr *iph = ipv6_hdr(skb); |
2cc7d573 HW |
70 | |
71 | rt_info->daddr = iph->daddr; | |
72 | rt_info->saddr = iph->saddr; | |
9f40ac71 | 73 | rt_info->mark = skb->mark; |
2cc7d573 HW |
74 | } |
75 | } | |
76 | ||
02f014d8 PM |
77 | static int nf_ip6_reroute(struct sk_buff *skb, |
78 | const struct nf_queue_entry *entry) | |
2cc7d573 | 79 | { |
02f014d8 | 80 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
2cc7d573 | 81 | |
02f014d8 | 82 | if (entry->hook == NF_INET_LOCAL_OUT) { |
3db05fea | 83 | struct ipv6hdr *iph = ipv6_hdr(skb); |
2cc7d573 | 84 | if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) || |
9f40ac71 EL |
85 | !ipv6_addr_equal(&iph->saddr, &rt_info->saddr) || |
86 | skb->mark != rt_info->mark) | |
3db05fea | 87 | return ip6_route_me_harder(skb); |
2cc7d573 HW |
88 | } |
89 | return 0; | |
90 | } | |
91 | ||
1841a4c7 PM |
92 | static int nf_ip6_route(struct dst_entry **dst, struct flowi *fl) |
93 | { | |
4591db4f | 94 | *dst = ip6_route_output(&init_net, NULL, fl); |
1841a4c7 PM |
95 | return (*dst)->error; |
96 | } | |
97 | ||
b51655b9 | 98 | __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, |
422c346f PM |
99 | unsigned int dataoff, u_int8_t protocol) |
100 | { | |
0660e03f | 101 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
b51655b9 | 102 | __sum16 csum = 0; |
422c346f PM |
103 | |
104 | switch (skb->ip_summed) { | |
84fa7933 | 105 | case CHECKSUM_COMPLETE: |
6e23ae2a | 106 | if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN) |
422c346f PM |
107 | break; |
108 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
1ab1457c | 109 | skb->len - dataoff, protocol, |
422c346f PM |
110 | csum_sub(skb->csum, |
111 | skb_checksum(skb, 0, | |
112 | dataoff, 0)))) { | |
113 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
114 | break; | |
115 | } | |
116 | /* fall through */ | |
117 | case CHECKSUM_NONE: | |
868c86bc AV |
118 | skb->csum = ~csum_unfold( |
119 | csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
422c346f PM |
120 | skb->len - dataoff, |
121 | protocol, | |
122 | csum_sub(0, | |
123 | skb_checksum(skb, 0, | |
1ab1457c | 124 | dataoff, 0)))); |
422c346f PM |
125 | csum = __skb_checksum_complete(skb); |
126 | } | |
127 | return csum; | |
128 | } | |
422c346f PM |
129 | EXPORT_SYMBOL(nf_ip6_checksum); |
130 | ||
d63a6507 PM |
131 | static __sum16 nf_ip6_checksum_partial(struct sk_buff *skb, unsigned int hook, |
132 | unsigned int dataoff, unsigned int len, | |
133 | u_int8_t protocol) | |
134 | { | |
135 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
136 | __wsum hsum; | |
137 | __sum16 csum = 0; | |
138 | ||
139 | switch (skb->ip_summed) { | |
140 | case CHECKSUM_COMPLETE: | |
141 | if (len == skb->len - dataoff) | |
142 | return nf_ip6_checksum(skb, hook, dataoff, protocol); | |
143 | /* fall through */ | |
144 | case CHECKSUM_NONE: | |
145 | hsum = skb_checksum(skb, 0, dataoff, 0); | |
146 | skb->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, | |
147 | &ip6h->daddr, | |
148 | skb->len - dataoff, | |
149 | protocol, | |
150 | csum_sub(0, hsum))); | |
151 | skb->ip_summed = CHECKSUM_NONE; | |
c86ee67c | 152 | return __skb_checksum_complete_head(skb, dataoff + len); |
d63a6507 PM |
153 | } |
154 | return csum; | |
155 | }; | |
156 | ||
1e796fda | 157 | static const struct nf_afinfo nf_ip6_afinfo = { |
d63a6507 PM |
158 | .family = AF_INET6, |
159 | .checksum = nf_ip6_checksum, | |
160 | .checksum_partial = nf_ip6_checksum_partial, | |
161 | .route = nf_ip6_route, | |
162 | .saveroute = nf_ip6_saveroute, | |
163 | .reroute = nf_ip6_reroute, | |
164 | .route_key_size = sizeof(struct ip6_rt_info), | |
2cc7d573 HW |
165 | }; |
166 | ||
167 | int __init ipv6_netfilter_init(void) | |
168 | { | |
bce8032e | 169 | return nf_register_afinfo(&nf_ip6_afinfo); |
2cc7d573 HW |
170 | } |
171 | ||
5bf887f2 DM |
172 | /* This can be called from inet6_init() on errors, so it cannot |
173 | * be marked __exit. -DaveM | |
174 | */ | |
175 | void ipv6_netfilter_fini(void) | |
2cc7d573 | 176 | { |
bce8032e | 177 | nf_unregister_afinfo(&nf_ip6_afinfo); |
2cc7d573 | 178 | } |