1 #include <linux/kernel.h>
2 #include <linux/init.h>
3 #include <linux/ipv6.h>
4 #include <linux/netfilter.h>
5 #include <linux/netfilter_ipv6.h>
6 #include <net/dst.h>
7 #include <net/ipv6.h>
8 #include <net/ip6_route.h>
9 #include <net/xfrm.h>
10 #include <net/ip6_checksum.h>
11 #include <net/netfilter/nf_queue.h>
12
13 int ip6_route_me_harder(struct sk_buff *skb)
14 {
15 struct net *net = dev_net(skb_dst(skb)->dev);
16 struct ipv6hdr *iph = ipv6_hdr(skb);
17 struct dst_entry *dst;
18 struct flowi fl = {
19 .oif = skb->sk ? skb->sk->sk_bound_dev_if : 0,
20 .mark = skb->mark,
21 .nl_u =
22 { .ip6_u =
23 { .daddr = iph->daddr,
24 .saddr = iph->saddr, } },
25 };
26
27 dst = ip6_route_output(net, skb->sk, &fl);
28
29 #ifdef CONFIG_XFRM
30 if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
31 xfrm_decode_session(skb, &fl, AF_INET6) == 0) {
32 struct dst_entry *dst2 = skb_dst(skb);
33
34 if (xfrm_lookup(net, &dst2, &fl, skb->sk, 0)) {
35 skb_dst_set(skb, NULL);
36 return -1;
37 }
38 skb_dst_set(skb, dst2);
39 }
40 #endif
41
42 if (dst->error) {
43 IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
44 LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n");
45 dst_release(dst);
46 return -EINVAL;
47 }
48
49 /* Drop old route. */
50 skb_dst_drop(skb);
51
52 skb_dst_set(skb, dst);
53 return 0;
54 }
55 EXPORT_SYMBOL(ip6_route_me_harder);
56
57 /*
58 * Extra routing may needed on local out, as the QUEUE target never
59 * returns control to the table.
60 */
61
62 struct ip6_rt_info {
63 struct in6_addr daddr;
64 struct in6_addr saddr;
65 u_int32_t mark;
66 };
67
68 static void nf_ip6_saveroute(const struct sk_buff *skb,
69 struct nf_queue_entry *entry)
70 {
71 struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
72
73 if (entry->hook == NF_INET_LOCAL_OUT) {
74 struct ipv6hdr *iph = ipv6_hdr(skb);
75
76 rt_info->daddr = iph->daddr;
77 rt_info->saddr = iph->saddr;
78 rt_info->mark = skb->mark;
79 }
80 }
81
82 static int nf_ip6_reroute(struct sk_buff *skb,
83 const 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 struct ipv6hdr *iph = ipv6_hdr(skb);
89 if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
90 !ipv6_addr_equal(&iph->saddr, &rt_info->saddr) ||
91 skb->mark != rt_info->mark)
92 return ip6_route_me_harder(skb);
93 }
94 return 0;
95 }
96
97 static int nf_ip6_route(struct dst_entry **dst, struct flowi *fl)
98 {
99 *dst = ip6_route_output(&init_net, NULL, fl);
100 return (*dst)->error;
101 }
102
103 __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
104 unsigned int dataoff, u_int8_t protocol)
105 {
106 struct ipv6hdr *ip6h = ipv6_hdr(skb);
107 __sum16 csum = 0;
108
109 switch (skb->ip_summed) {
110 case CHECKSUM_COMPLETE:
111 if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN)
112 break;
113 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
114 skb->len - dataoff, protocol,
115 csum_sub(skb->csum,
116 skb_checksum(skb, 0,
117 dataoff, 0)))) {
118 skb->ip_summed = CHECKSUM_UNNECESSARY;
119 break;
120 }
121 /* fall through */
122 case CHECKSUM_NONE:
123 skb->csum = ~csum_unfold(
124 csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
125 skb->len - dataoff,
126 protocol,
127 csum_sub(0,
128 skb_checksum(skb, 0,
129 dataoff, 0))));
130 csum = __skb_checksum_complete(skb);
131 }
132 return csum;
133 }
134 EXPORT_SYMBOL(nf_ip6_checksum);
135
136 static __sum16 nf_ip6_checksum_partial(struct sk_buff *skb, unsigned int hook,
137 unsigned int dataoff, unsigned int len,
138 u_int8_t protocol)
139 {
140 struct ipv6hdr *ip6h = ipv6_hdr(skb);
141 __wsum hsum;
142 __sum16 csum = 0;
143
144 switch (skb->ip_summed) {
145 case CHECKSUM_COMPLETE:
146 if (len == skb->len - dataoff)
147 return nf_ip6_checksum(skb, hook, dataoff, protocol);
148 /* fall through */
149 case CHECKSUM_NONE:
150 hsum = skb_checksum(skb, 0, dataoff, 0);
151 skb->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
152 &ip6h->daddr,
153 skb->len - dataoff,
154 protocol,
155 csum_sub(0, hsum)));
156 skb->ip_summed = CHECKSUM_NONE;
157 csum = __skb_checksum_complete_head(skb, dataoff + len);
158 if (!csum)
159 skb->ip_summed = CHECKSUM_UNNECESSARY;
160 }
161 return csum;
162 };
163
164 static const struct nf_afinfo nf_ip6_afinfo = {
165 .family = AF_INET6,
166 .checksum = nf_ip6_checksum,
167 .checksum_partial = nf_ip6_checksum_partial,
168 .route = nf_ip6_route,
169 .saveroute = nf_ip6_saveroute,
170 .reroute = nf_ip6_reroute,
171 .route_key_size = sizeof(struct ip6_rt_info),
172 };
173
174 int __init ipv6_netfilter_init(void)
175 {
176 return nf_register_afinfo(&nf_ip6_afinfo);
177 }
178
179 /* This can be called from inet6_init() on errors, so it cannot
180 * be marked __exit. -DaveM
181 */
182 void ipv6_netfilter_fini(void)
183 {
184 nf_unregister_afinfo(&nf_ip6_afinfo);
185 }
186
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