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 <net/dst.h>
   9 #include <net/ipv6.h>
  10 #include <net/ip6_route.h>
  11
  12 int ip6_route_me_harder(struct sk_buff *skb)
  13 {
  14         struct ipv6hdr *iph = skb->nh.ipv6h;
  15         struct dst_entry *dst;
  16         struct flowi fl = {
  17                 .oif = skb->sk ? skb->sk->sk_bound_dev_if : 0,
  18                 .nl_u =
  19                 { .ip6_u =
  20                   { .daddr = iph->daddr,
  21                     .saddr = iph->saddr, } },
  22                 .proto = iph->nexthdr,
  23         };
  24
  25         dst = ip6_route_output(skb->sk, &fl);
  26
  27         if (dst->error) {
  28                 IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
  29                 LIMIT_NETDEBUG(
  30                         printk(KERN_DEBUG "ip6_route_me_harder: No more route.\n"));
  31                 dst_release(dst);
  32                 return -EINVAL;
  33         }
  34
  35         /* Drop old route. */
  36         dst_release(skb->dst);
  37
  38         skb->dst = dst;
  39         return 0;
  40 }
  41 EXPORT_SYMBOL(ip6_route_me_harder);
  42
  43 #endif /* CONFIG_NETFILTER */