net: Add optional SKB arg to dst_ops->neigh_lookup().

Causes the handler to use the daddr in the ipv4/ipv6 header when
the route gateway is unspecified (local subnet).

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/dst_ops.h b/include/net/dst_ops.h
index 3682a0a..4badc86 100644
--- a/include/net/dst_ops.h
+++ b/include/net/dst_ops.h
@@ -26,7 +26,9 @@
 	void			(*link_failure)(struct sk_buff *);
 	void			(*update_pmtu)(struct dst_entry *dst, u32 mtu);
 	int			(*local_out)(struct sk_buff *skb);
-	struct neighbour *	(*neigh_lookup)(const struct dst_entry *dst, const void *daddr);
+	struct neighbour *	(*neigh_lookup)(const struct dst_entry *dst,
+						struct sk_buff *skb,
+						const void *daddr);
 
 	struct kmem_cache	*kmem_cachep;