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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 | int err; |
34 | |
35 | dst = ip6_route_output(net, skb->sk, &fl6); |
36 | err = dst->error; |
37 | if (err) { |
38 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
39 | LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n"); |
40 | dst_release(dst); |
41 | return err; |
42 | } |
43 | |
44 | /* Drop old route. */ |
45 | skb_dst_drop(skb); |
46 | |
47 | skb_dst_set(skb, dst); |
48 | |
49 | #ifdef CONFIG_XFRM |
50 | if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) && |
51 | xfrm_decode_session(skb, flowi6_to_flowi(&fl6), AF_INET6) == 0) { |
52 | skb_dst_set(skb, NULL); |
53 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), skb->sk, 0); |
54 | if (IS_ERR(dst)) |
55 | return PTR_ERR(dst); |
56 | skb_dst_set(skb, dst); |
57 | } |
58 | #endif |
59 | |
60 | /* Change in oif may mean change in hh_len. */ |
61 | hh_len = skb_dst(skb)->dev->hard_header_len; |
62 | if (skb_headroom(skb) < hh_len && |
63 | pskb_expand_head(skb, HH_DATA_ALIGN(hh_len - skb_headroom(skb)), |
64 | 0, GFP_ATOMIC)) |
65 | return -ENOMEM; |
66 | |
67 | return 0; |
68 | } |
69 | EXPORT_SYMBOL(ip6_route_me_harder); |
70 | |
71 | /* |
72 | * Extra routing may needed on local out, as the QUEUE target never |
73 | * returns control to the table. |
74 | */ |
75 | |
76 | struct ip6_rt_info { |
77 | struct in6_addr daddr; |
78 | struct in6_addr saddr; |
79 | u_int32_t mark; |
80 | }; |
81 | |
82 | static void nf_ip6_saveroute(const struct sk_buff *skb, |
83 | struct nf_queue_entry *entry) |
84 | { |
85 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
86 | |
87 | if (entry->hook == NF_INET_LOCAL_OUT) { |
88 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
89 | |
90 | rt_info->daddr = iph->daddr; |
91 | rt_info->saddr = iph->saddr; |
92 | rt_info->mark = skb->mark; |
93 | } |
94 | } |
95 | |
96 | static int nf_ip6_reroute(struct sk_buff *skb, |
97 | const struct nf_queue_entry *entry) |
98 | { |
99 | struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry); |
100 | |
101 | if (entry->hook == NF_INET_LOCAL_OUT) { |
102 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
103 | if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) || |
104 | !ipv6_addr_equal(&iph->saddr, &rt_info->saddr) || |
105 | skb->mark != rt_info->mark) |
106 | return ip6_route_me_harder(skb); |
107 | } |
108 | return 0; |
109 | } |
110 | |
111 | static int nf_ip6_route(struct net *net, struct dst_entry **dst, |
112 | struct flowi *fl, bool strict) |
113 | { |
114 | static const struct ipv6_pinfo fake_pinfo; |
115 | static const struct inet_sock fake_sk = { |
116 | /* makes ip6_route_output set RT6_LOOKUP_F_IFACE: */ |
117 | .sk.sk_bound_dev_if = 1, |
118 | .pinet6 = (struct ipv6_pinfo *) &fake_pinfo, |
119 | }; |
120 | const void *sk = strict ? &fake_sk : NULL; |
121 | struct dst_entry *result; |
122 | int err; |
123 | |
124 | result = ip6_route_output(net, sk, &fl->u.ip6); |
125 | err = result->error; |
126 | if (err) |
127 | dst_release(result); |
128 | else |
129 | *dst = result; |
130 | return err; |
131 | } |
132 | |
133 | __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, |
134 | unsigned int dataoff, u_int8_t protocol) |
135 | { |
136 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
137 | __sum16 csum = 0; |
138 | |
139 | switch (skb->ip_summed) { |
140 | case CHECKSUM_COMPLETE: |
141 | if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN) |
142 | break; |
143 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, |
144 | skb->len - dataoff, protocol, |
145 | csum_sub(skb->csum, |
146 | skb_checksum(skb, 0, |
147 | dataoff, 0)))) { |
148 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
149 | break; |
150 | } |
151 | /* fall through */ |
152 | case CHECKSUM_NONE: |
153 | skb->csum = ~csum_unfold( |
154 | csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, |
155 | skb->len - dataoff, |
156 | protocol, |
157 | csum_sub(0, |
158 | skb_checksum(skb, 0, |
159 | dataoff, 0)))); |
160 | csum = __skb_checksum_complete(skb); |
161 | } |
162 | return csum; |
163 | } |
164 | EXPORT_SYMBOL(nf_ip6_checksum); |
165 | |
166 | static __sum16 nf_ip6_checksum_partial(struct sk_buff *skb, unsigned int hook, |
167 | unsigned int dataoff, unsigned int len, |
168 | u_int8_t protocol) |
169 | { |
170 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
171 | __wsum hsum; |
172 | __sum16 csum = 0; |
173 | |
174 | switch (skb->ip_summed) { |
175 | case CHECKSUM_COMPLETE: |
176 | if (len == skb->len - dataoff) |
177 | return nf_ip6_checksum(skb, hook, dataoff, protocol); |
178 | /* fall through */ |
179 | case CHECKSUM_NONE: |
180 | hsum = skb_checksum(skb, 0, dataoff, 0); |
181 | skb->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, |
182 | &ip6h->daddr, |
183 | skb->len - dataoff, |
184 | protocol, |
185 | csum_sub(0, hsum))); |
186 | skb->ip_summed = CHECKSUM_NONE; |
187 | return __skb_checksum_complete_head(skb, dataoff + len); |
188 | } |
189 | return csum; |
190 | }; |
191 | |
192 | static const struct nf_ipv6_ops ipv6ops = { |
193 | .chk_addr = ipv6_chk_addr, |
194 | }; |
195 | |
196 | static const struct nf_afinfo nf_ip6_afinfo = { |
197 | .family = AF_INET6, |
198 | .checksum = nf_ip6_checksum, |
199 | .checksum_partial = nf_ip6_checksum_partial, |
200 | .route = nf_ip6_route, |
201 | .saveroute = nf_ip6_saveroute, |
202 | .reroute = nf_ip6_reroute, |
203 | .route_key_size = sizeof(struct ip6_rt_info), |
204 | }; |
205 | |
206 | int __init ipv6_netfilter_init(void) |
207 | { |
208 | RCU_INIT_POINTER(nf_ipv6_ops, &ipv6ops); |
209 | return nf_register_afinfo(&nf_ip6_afinfo); |
210 | } |
211 | |
212 | /* This can be called from inet6_init() on errors, so it cannot |
213 | * be marked __exit. -DaveM |
214 | */ |
215 | void ipv6_netfilter_fini(void) |
216 | { |
217 | RCU_INIT_POINTER(nf_ipv6_ops, NULL); |
218 | nf_unregister_afinfo(&nf_ip6_afinfo); |
219 | } |
220 |
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