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>
12 int ip6_route_me_harder(struct sk_buff *skb)
14 struct ipv6hdr *iph = ipv6_hdr(skb);
15 struct dst_entry *dst;
17 .oif = skb->sk ? skb->sk->sk_bound_dev_if : 0,
21 { .daddr = iph->daddr,
22 .saddr = iph->saddr, } },
25 dst = ip6_route_output(skb->sk, &fl);
28 if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
29 xfrm_decode_session(skb, &fl, AF_INET6) == 0)
30 if (xfrm_lookup(&skb->dst, &fl, skb->sk, 0))
35 IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
36 LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n");
42 dst_release(skb->dst);
47 EXPORT_SYMBOL(ip6_route_me_harder);
50 * Extra routing may needed on local out, as the QUEUE target never
51 * returns control to the table.
55 struct in6_addr daddr;
56 struct in6_addr saddr;
59 static void nf_ip6_saveroute(const struct sk_buff *skb, struct nf_info *info)
61 struct ip6_rt_info *rt_info = nf_info_reroute(info);
63 if (info->hook == NF_INET_LOCAL_OUT) {
64 struct ipv6hdr *iph = ipv6_hdr(skb);
66 rt_info->daddr = iph->daddr;
67 rt_info->saddr = iph->saddr;
71 static int nf_ip6_reroute(struct sk_buff *skb, const struct nf_info *info)
73 struct ip6_rt_info *rt_info = nf_info_reroute(info);
75 if (info->hook == NF_INET_LOCAL_OUT) {
76 struct ipv6hdr *iph = ipv6_hdr(skb);
77 if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
78 !ipv6_addr_equal(&iph->saddr, &rt_info->saddr))
79 return ip6_route_me_harder(skb);
84 static int nf_ip6_route(struct dst_entry **dst, struct flowi *fl)
86 *dst = ip6_route_output(NULL, fl);
90 __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
91 unsigned int dataoff, u_int8_t protocol)
93 struct ipv6hdr *ip6h = ipv6_hdr(skb);
96 switch (skb->ip_summed) {
97 case CHECKSUM_COMPLETE:
98 if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN)
100 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
101 skb->len - dataoff, protocol,
105 skb->ip_summed = CHECKSUM_UNNECESSARY;
110 skb->csum = ~csum_unfold(
111 csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
117 csum = __skb_checksum_complete(skb);
122 EXPORT_SYMBOL(nf_ip6_checksum);
124 static struct nf_afinfo nf_ip6_afinfo = {
126 .checksum = nf_ip6_checksum,
127 .route = nf_ip6_route,
128 .saveroute = nf_ip6_saveroute,
129 .reroute = nf_ip6_reroute,
130 .route_key_size = sizeof(struct ip6_rt_info),
133 int __init ipv6_netfilter_init(void)
135 return nf_register_afinfo(&nf_ip6_afinfo);
138 /* This can be called from inet6_init() on errors, so it cannot
139 * be marked __exit. -DaveM
141 void ipv6_netfilter_fini(void)
143 nf_unregister_afinfo(&nf_ip6_afinfo);