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(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, struct nf_info *info)
62 struct ip6_rt_info *rt_info = nf_info_reroute(info);
64 if (info->hook == NF_INET_LOCAL_OUT) {
65 struct ipv6hdr *iph = ipv6_hdr(skb);
67 rt_info->daddr = iph->daddr;
68 rt_info->saddr = iph->saddr;
72 static int nf_ip6_reroute(struct sk_buff *skb, const struct nf_info *info)
74 struct ip6_rt_info *rt_info = nf_info_reroute(info);
76 if (info->hook == NF_INET_LOCAL_OUT) {
77 struct ipv6hdr *iph = ipv6_hdr(skb);
78 if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
79 !ipv6_addr_equal(&iph->saddr, &rt_info->saddr))
80 return ip6_route_me_harder(skb);
85 static int nf_ip6_route(struct dst_entry **dst, struct flowi *fl)
87 *dst = ip6_route_output(NULL, fl);
91 __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
92 unsigned int dataoff, u_int8_t protocol)
94 struct ipv6hdr *ip6h = ipv6_hdr(skb);
97 switch (skb->ip_summed) {
98 case CHECKSUM_COMPLETE:
99 if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN)
101 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
102 skb->len - dataoff, protocol,
106 skb->ip_summed = CHECKSUM_UNNECESSARY;
111 skb->csum = ~csum_unfold(
112 csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
118 csum = __skb_checksum_complete(skb);
123 EXPORT_SYMBOL(nf_ip6_checksum);
125 static struct nf_afinfo nf_ip6_afinfo = {
127 .checksum = nf_ip6_checksum,
128 .route = nf_ip6_route,
129 .saveroute = nf_ip6_saveroute,
130 .reroute = nf_ip6_reroute,
131 .route_key_size = sizeof(struct ip6_rt_info),
134 int __init ipv6_netfilter_init(void)
136 return nf_register_afinfo(&nf_ip6_afinfo);
139 /* This can be called from inet6_init() on errors, so it cannot
140 * be marked __exit. -DaveM
142 void ipv6_netfilter_fini(void)
144 nf_unregister_afinfo(&nf_ip6_afinfo);