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>
8 #include <net/ip6_route.h>
10 #include <net/ip6_checksum.h>
11 #include <net/netfilter/nf_queue.h>
13 int ip6_route_me_harder(struct sk_buff *skb)
15 struct ipv6hdr *iph = ipv6_hdr(skb);
16 struct dst_entry *dst;
18 .oif = skb->sk ? skb->sk->sk_bound_dev_if : 0,
22 { .daddr = iph->daddr,
23 .saddr = iph->saddr, } },
26 dst = ip6_route_output(&init_net, skb->sk, &fl);
29 if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
30 xfrm_decode_session(skb, &fl, AF_INET6) == 0)
31 if (xfrm_lookup(&skb->dst, &fl, skb->sk, 0))
36 IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
37 LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n");
43 dst_release(skb->dst);
48 EXPORT_SYMBOL(ip6_route_me_harder);
51 * Extra routing may needed on local out, as the QUEUE target never
52 * returns control to the table.
56 struct in6_addr daddr;
57 struct in6_addr saddr;
60 static void nf_ip6_saveroute(const struct sk_buff *skb,
61 struct nf_queue_entry *entry)
63 struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
65 if (entry->hook == NF_INET_LOCAL_OUT) {
66 struct ipv6hdr *iph = ipv6_hdr(skb);
68 rt_info->daddr = iph->daddr;
69 rt_info->saddr = iph->saddr;
73 static int nf_ip6_reroute(struct sk_buff *skb,
74 const struct nf_queue_entry *entry)
76 struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
78 if (entry->hook == NF_INET_LOCAL_OUT) {
79 struct ipv6hdr *iph = ipv6_hdr(skb);
80 if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
81 !ipv6_addr_equal(&iph->saddr, &rt_info->saddr))
82 return ip6_route_me_harder(skb);
87 static int nf_ip6_route(struct dst_entry **dst, struct flowi *fl)
89 *dst = ip6_route_output(&init_net, NULL, fl);
93 __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
94 unsigned int dataoff, u_int8_t protocol)
96 struct ipv6hdr *ip6h = ipv6_hdr(skb);
99 switch (skb->ip_summed) {
100 case CHECKSUM_COMPLETE:
101 if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN)
103 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
104 skb->len - dataoff, protocol,
108 skb->ip_summed = CHECKSUM_UNNECESSARY;
113 skb->csum = ~csum_unfold(
114 csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
120 csum = __skb_checksum_complete(skb);
124 EXPORT_SYMBOL(nf_ip6_checksum);
126 static __sum16 nf_ip6_checksum_partial(struct sk_buff *skb, unsigned int hook,
127 unsigned int dataoff, unsigned int len,
130 struct ipv6hdr *ip6h = ipv6_hdr(skb);
134 switch (skb->ip_summed) {
135 case CHECKSUM_COMPLETE:
136 if (len == skb->len - dataoff)
137 return nf_ip6_checksum(skb, hook, dataoff, protocol);
140 hsum = skb_checksum(skb, 0, dataoff, 0);
141 skb->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
146 skb->ip_summed = CHECKSUM_NONE;
147 csum = __skb_checksum_complete_head(skb, dataoff + len);
149 skb->ip_summed = CHECKSUM_UNNECESSARY;
154 static const struct nf_afinfo nf_ip6_afinfo = {
156 .checksum = nf_ip6_checksum,
157 .checksum_partial = nf_ip6_checksum_partial,
158 .route = nf_ip6_route,
159 .saveroute = nf_ip6_saveroute,
160 .reroute = nf_ip6_reroute,
161 .route_key_size = sizeof(struct ip6_rt_info),
164 int __init ipv6_netfilter_init(void)
166 return nf_register_afinfo(&nf_ip6_afinfo);
169 /* This can be called from inet6_init() on errors, so it cannot
170 * be marked __exit. -DaveM
172 void ipv6_netfilter_fini(void)
174 nf_unregister_afinfo(&nf_ip6_afinfo);