net: Add ->neigh_lookup() operation to dst_ops

In the future dst entries will be neigh-less.  In that environment we
need to have an easy transition point for current users of
dst->neighbour outside of the packet output fast path.

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 6 insertions, 9 deletions

diff --git a/include/net/arp.h b/include/net/arp.h
index 5e669e6ffb42..4979af8b1559 100644
--- a/include/net/arp.h
+++ b/include/net/arp.h
@@ -38,15 +38,6 @@ static inline struct neighbour *__ipv4_neigh_lookup(struct neigh_table *tbl, str
 	return n;
 }
 
-static inline struct neighbour *ipv4_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const __be32 *pkey)
-{
-	struct neighbour *n = __ipv4_neigh_lookup(tbl, dev,
-						  *(__force u32 *)pkey);
-	if (n)
-		return n;
-	return neigh_create(tbl, pkey, dev);
-}
-
 extern void	arp_init(void);
 extern int	arp_find(unsigned char *haddr, struct sk_buff *skb);
 extern int	arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
diff --git a/include/net/dst.h b/include/net/dst.h
index 8147206eefb9..29e255796ce1 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -387,6 +387,11 @@ static inline void dst_confirm(struct dst_entry *dst)
 	}
 }
 
+static inline struct neighbour *dst_neigh_lookup(const struct dst_entry *dst, const void *daddr)
+{
+	return dst->ops->neigh_lookup(dst, daddr);
+}
+
 static inline void dst_link_failure(struct sk_buff *skb)
 {
 	struct dst_entry *dst = skb_dst(skb);
diff --git a/include/net/dst_ops.h b/include/net/dst_ops.h
index dc0746328947..9adb99845a56 100644
--- a/include/net/dst_ops.h
+++ b/include/net/dst_ops.h
@@ -26,6 +26,7 @@ struct dst_ops {
 	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 kmem_cache	*kmem_cachep;