vcs.maemo.org Git - h-e-n/blob - net/ipv6/netfilter.c

   1 #include <linux/config.h>
   2 #include <linux/init.h>
   3
   4 #ifdef CONFIG_NETFILTER
   5
   6 #include <linux/kernel.h>
   7 #include <linux/ipv6.h>
   8 #include <linux/netfilter.h>
   9 #include <linux/netfilter_ipv6.h>
  10 #include <net/dst.h>
  11 #include <net/ipv6.h>
  12 #include <net/ip6_route.h>
  13
  14 int ip6_route_me_harder(struct sk_buff *skb)
  15 {
  16         struct ipv6hdr *iph = skb->nh.ipv6h;
  17         struct dst_entry *dst;
  18         struct flowi fl = {
  19                 .oif = skb->sk ? skb->sk->sk_bound_dev_if : 0,
  20                 .nl_u =
  21                 { .ip6_u =
  22                   { .daddr = iph->daddr,
  23                     .saddr = iph->saddr, } },
  24                 .proto = iph->nexthdr,
  25         };
  26
  27         dst = ip6_route_output(skb->sk, &fl);
  28
  29         if (dst->error) {
  30                 IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
  31                 LIMIT_NETDEBUG(
  32                         printk(KERN_DEBUG "ip6_route_me_harder: No more route.\n"));
  33                 dst_release(dst);
  34                 return -EINVAL;
  35         }
  36
  37         /* Drop old route. */
  38         dst_release(skb->dst);
  39
  40         skb->dst = dst;
  41         return 0;
  42 }
  43 EXPORT_SYMBOL(ip6_route_me_harder);
  44
  45 /*
  46  * Extra routing may needed on local out, as the QUEUE target never
  47  * returns control to the table.
  48  */
  49
  50 struct ip6_rt_info {
  51         struct in6_addr daddr;
  52         struct in6_addr saddr;
  53 };
  54
  55 static void save(const struct sk_buff *skb, struct nf_info *info)
  56 {
  57         struct ip6_rt_info *rt_info = nf_info_reroute(info);
  58
  59         if (info->hook == NF_IP6_LOCAL_OUT) {
  60                 struct ipv6hdr *iph = skb->nh.ipv6h;
  61
  62                 rt_info->daddr = iph->daddr;
  63                 rt_info->saddr = iph->saddr;
  64         }
  65 }
  66
  67 static int reroute(struct sk_buff **pskb, const struct nf_info *info)
  68 {
  69         struct ip6_rt_info *rt_info = nf_info_reroute(info);
  70
  71         if (info->hook == NF_IP6_LOCAL_OUT) {
  72                 struct ipv6hdr *iph = (*pskb)->nh.ipv6h;
  73                 if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
  74                     !ipv6_addr_equal(&iph->saddr, &rt_info->saddr))
  75                         return ip6_route_me_harder(*pskb);
  76         }
  77         return 0;
  78 }
  79
  80 static struct nf_queue_rerouter ip6_reroute = {
  81         .rer_size       = sizeof(struct ip6_rt_info),
  82         .save           = &save,
  83         .reroute        = &reroute,
  84 };
  85
  86 int __init ipv6_netfilter_init(void)
  87 {
  88         return nf_register_queue_rerouter(PF_INET6, &ip6_reroute);
  89 }
  90
  91 void ipv6_netfilter_fini(void)
  92 {
  93         nf_unregister_queue_rerouter(PF_INET6);
  94 }
  95
  96 #else /* CONFIG_NETFILTER */
  97 int __init ipv6_netfilter_init(void)
  98 {
  99         return 0;
 100 }
 101
 102 void ipv6_netfilter_fini(void)
 103 {
 104 }
 105 #endif /* CONFIG_NETFILTER */