Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

[linux-2.6] / net / ipv4 / netfilter.c

diff --git a/net/ipv4/netfilter.c b/net/ipv4/netfilter.c
index 52a3d7c579076e8bc7e260534ab4876032cf04af..ed42cdc57cd95c42614d1dc70d60a2b820dc1ed9 100644 (file)
--- a/net/ipv4/netfilter.c
+++ b/net/ipv4/netfilter.c
@@ -78,6 +78,47 @@ int ip_route_me_harder(struct sk_buff **pskb)
 }
 EXPORT_SYMBOL(ip_route_me_harder);
 
+#ifdef CONFIG_XFRM
+int ip_xfrm_me_harder(struct sk_buff **pskb)
+{
+       struct flowi fl;
+       unsigned int hh_len;
+       struct dst_entry *dst;
+
+       if (IPCB(*pskb)->flags & IPSKB_XFRM_TRANSFORMED)
+               return 0;
+       if (xfrm_decode_session(*pskb, &fl, AF_INET) < 0)
+               return -1;
+
+       dst = (*pskb)->dst;
+       if (dst->xfrm)
+               dst = ((struct xfrm_dst *)dst)->route;
+       dst_hold(dst);
+
+       if (xfrm_lookup(&dst, &fl, (*pskb)->sk, 0) < 0)
+               return -1;
+
+       dst_release((*pskb)->dst);
+       (*pskb)->dst = dst;
+
+       /* Change in oif may mean change in hh_len. */
+       hh_len = (*pskb)->dst->dev->hard_header_len;
+       if (skb_headroom(*pskb) < hh_len) {
+               struct sk_buff *nskb;
+
+               nskb = skb_realloc_headroom(*pskb, hh_len);
+               if (!nskb)
+                       return -1;
+               if ((*pskb)->sk)
+                       skb_set_owner_w(nskb, (*pskb)->sk);
+               kfree_skb(*pskb);
+               *pskb = nskb;
+       }
+       return 0;
+}
+EXPORT_SYMBOL(ip_xfrm_me_harder);
+#endif
+
 void (*ip_nat_decode_session)(struct sk_buff *, struct flowi *);
 EXPORT_SYMBOL(ip_nat_decode_session);