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>

1 files changed, 10 insertions, 4 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index c518e4ec0cea..4b581c675bb2 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -120,21 +120,27 @@ static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
         return p;
 }
 
-static inline const void *choose_neigh_daddr(struct rt6_info *rt, const void *daddr)
+static inline const void *choose_neigh_daddr(struct rt6_info *rt,
+                                             struct sk_buff *skb,
+                                             const void *daddr)
 {
         struct in6_addr *p = &rt->rt6i_gateway;
 
         if (!ipv6_addr_any(p))
                 return (const void *) p;
+        else if (skb)
+                return &ipv6_hdr(skb)->daddr;
         return daddr;
 }
 
-static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, const void *daddr)
+static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
+                                          struct sk_buff *skb,
+                                          const void *daddr)
 {
         struct rt6_info *rt = (struct rt6_info *) dst;
         struct neighbour *n;
 
-        daddr = choose_neigh_daddr(rt, daddr);
+        daddr = choose_neigh_daddr(rt, skb, daddr);
         n = __ipv6_neigh_lookup(&nd_tbl, dst->dev, daddr);
         if (n)
                 return n;
@@ -1162,7 +1168,7 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
         if (neigh)
                 neigh_hold(neigh);
         else {
-                neigh = ip6_neigh_lookup(&rt->dst, &fl6->daddr);
+                neigh = ip6_neigh_lookup(&rt->dst, NULL, &fl6->daddr);
                 if (IS_ERR(neigh)) {
                         in6_dev_put(idev);
                         dst_free(&rt->dst);