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1 | /* |
2 | * IPv6 specific functions of netfilter core |
3 | * |
4 | * Rusty Russell (C) 2000 -- This code is GPL. |
5 | * Patrick McHardy (C) 2006-2012 |
6 | */ |
7 | #include <linux/kernel.h> |
8 | #include <linux/init.h> |
9 | #include <linux/ipv6.h> |
10 | #include <linux/netfilter.h> |
11 | #include <linux/netfilter_ipv6.h> |
12 | #include <linux/export.h> |
13 | #include <net/addrconf.h> |
14 | #include <net/dst.h> |
15 | #include <net/ipv6.h> |
16 | #include <net/ip6_route.h> |
17 | #include <net/xfrm.h> |
18 | #include <net/ip6_checksum.h> |
19 | #include <net/netfilter/nf_queue.h> |
20 | |
21 | int ip6_route_me_harder(struct sk_buff *skb) |
22 | { |
23 | struct net *net = dev_net(skb_dst(skb)->dev); |
24 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
25 | unsigned int hh_len; |
26 | struct dst_entry *dst; |
27 | struct flowi6 fl6 = { |
28 | .flowi6_oif = skb->sk ? skb->sk->sk_bound_dev_if : 0, |
29 | .flowi6_mark = skb->mark, |
30 | .daddr = iph->daddr, |
31 | .saddr = iph->saddr, |
32 | }; |
33 | |
34 | dst = ip6_route_output(net, skb->sk, &fl6); |
35 | if (dst->error) { |
36 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
37 | LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n"); |
38 | dst_release(dst); |
39 | return dst->error; |
40 | } |
41 | |
42 | /* Drop old route. */ |
43 | skb_dst_drop(skb); |
44 | |
45 | skb_dst_set(skb, dst); |
46 | |
47 | #ifdef CONFIG_XFRM |
48 | if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) && |
49 | xfrm_decode_session(skb, flowi6_to_flowi(&fl6), AF_INET6) == 0) { |
50 | skb_dst_set(skb, NULL); |
51 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), skb->sk, 0); |
52 | if (IS_ERR(dst)) |
53 | return PTR_ERR(dst); |
54 | skb_dst_set(skb, dst); |
55 | } |
56 | #endif |
57 | |
58 | /* Change in oif may mean change in hh_len. */ |
59 | hh_len = skb_dst(skb)->dev->hard_header_len; |
60 | if (skb_headroom(skb) < hh_len && |
61 | pskb_expand_head(skb, HH_DATA_ALIGN(hh_len - skb_headroom(skb)), |
62 | 0, GFP_ATOMIC)) |
63 | return -ENOMEM; |
64 | |
65 | return 0; |
66 | } |
67 | EXPORT_SYMBOL(ip6_route_me_harder); |
68 | |
69 | /* |
70 | * Extra routing may needed on local out, as the QUEUE target never |
71 | * returns control to the table. |
72 | */ |
73 | |
74 | struct ip6_rt_info { |
75 | struct in6_addr daddr; |
76 | struct in6_addr saddr; |
77 | u_int32_t mark; |
78 | }; |
79 | |
80 | static void nf_ip6_saveroute(const struct sk_buff *skb, |
81 | struct nf_queue_entry *entry) |
82 | { |
83 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
84 | |
85 | if (entry->hook == NF_INET_LOCAL_OUT) { |
86 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
87 | |
88 | rt_info->daddr = iph->daddr; |
89 | rt_info->saddr = iph->saddr; |
90 | rt_info->mark = skb->mark; |
91 | } |
92 | } |
93 | |
94 | static int nf_ip6_reroute(struct sk_buff *skb, |
95 | const struct nf_queue_entry *entry) |
96 | { |
97 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
98 | |
99 | if (entry->hook == NF_INET_LOCAL_OUT) { |
100 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
101 | if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) || |
102 | !ipv6_addr_equal(&iph->saddr, &rt_info->saddr) || |
103 | skb->mark != rt_info->mark) |
104 | return ip6_route_me_harder(skb); |
105 | } |
106 | return 0; |
107 | } |
108 | |
109 | static int nf_ip6_route(struct net *net, struct dst_entry **dst, |
110 | struct flowi *fl, bool strict) |
111 | { |
112 | static const struct ipv6_pinfo fake_pinfo; |
113 | static const struct inet_sock fake_sk = { |
114 | /* makes ip6_route_output set RT6_LOOKUP_F_IFACE: */ |
115 | .sk.sk_bound_dev_if = 1, |
116 | .pinet6 = (struct ipv6_pinfo *) &fake_pinfo, |
117 | }; |
118 | const void *sk = strict ? &fake_sk : NULL; |
119 | struct dst_entry *result; |
120 | int err; |
121 | |
122 | result = ip6_route_output(net, sk, &fl->u.ip6); |
123 | err = result->error; |
124 | if (err) |
125 | dst_release(result); |
126 | else |
127 | *dst = result; |
128 | return err; |
129 | } |
130 | |
131 | __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, |
132 | unsigned int dataoff, u_int8_t protocol) |
133 | { |
134 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
135 | __sum16 csum = 0; |
136 | |
137 | switch (skb->ip_summed) { |
138 | case CHECKSUM_COMPLETE: |
139 | if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN) |
140 | break; |
141 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, |
142 | skb->len - dataoff, protocol, |
143 | csum_sub(skb->csum, |
144 | skb_checksum(skb, 0, |
145 | dataoff, 0)))) { |
146 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
147 | break; |
148 | } |
149 | /* fall through */ |
150 | case CHECKSUM_NONE: |
151 | skb->csum = ~csum_unfold( |
152 | csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, |
153 | skb->len - dataoff, |
154 | protocol, |
155 | csum_sub(0, |
156 | skb_checksum(skb, 0, |
157 | dataoff, 0)))); |
158 | csum = __skb_checksum_complete(skb); |
159 | } |
160 | return csum; |
161 | } |
162 | EXPORT_SYMBOL(nf_ip6_checksum); |
163 | |
164 | static __sum16 nf_ip6_checksum_partial(struct sk_buff *skb, unsigned int hook, |
165 | unsigned int dataoff, unsigned int len, |
166 | u_int8_t protocol) |
167 | { |
168 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
169 | __wsum hsum; |
170 | __sum16 csum = 0; |
171 | |
172 | switch (skb->ip_summed) { |
173 | case CHECKSUM_COMPLETE: |
174 | if (len == skb->len - dataoff) |
175 | return nf_ip6_checksum(skb, hook, dataoff, protocol); |
176 | /* fall through */ |
177 | case CHECKSUM_NONE: |
178 | hsum = skb_checksum(skb, 0, dataoff, 0); |
179 | skb->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, |
180 | &ip6h->daddr, |
181 | skb->len - dataoff, |
182 | protocol, |
183 | csum_sub(0, hsum))); |
184 | skb->ip_summed = CHECKSUM_NONE; |
185 | return __skb_checksum_complete_head(skb, dataoff + len); |
186 | } |
187 | return csum; |
188 | }; |
189 | |
190 | static const struct nf_ipv6_ops ipv6ops = { |
191 | .chk_addr = ipv6_chk_addr, |
192 | }; |
193 | |
194 | static const struct nf_afinfo nf_ip6_afinfo = { |
195 | .family = AF_INET6, |
196 | .checksum = nf_ip6_checksum, |
197 | .checksum_partial = nf_ip6_checksum_partial, |
198 | .route = nf_ip6_route, |
199 | .saveroute = nf_ip6_saveroute, |
200 | .reroute = nf_ip6_reroute, |
201 | .route_key_size = sizeof(struct ip6_rt_info), |
202 | }; |
203 | |
204 | int __init ipv6_netfilter_init(void) |
205 | { |
206 | RCU_INIT_POINTER(nf_ipv6_ops, &ipv6ops); |
207 | return nf_register_afinfo(&nf_ip6_afinfo); |
208 | } |
209 | |
210 | /* This can be called from inet6_init() on errors, so it cannot |
211 | * be marked __exit. -DaveM |
212 | */ |
213 | void ipv6_netfilter_fini(void) |
214 | { |
215 | RCU_INIT_POINTER(nf_ipv6_ops, NULL); |
216 | nf_unregister_afinfo(&nf_ip6_afinfo); |
217 | } |
218 |
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