net: Create and use new helper, neigh_output().

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

include/net/neighbour.h

@@ -344,6 +344,15 @@ static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb)
 	return hh->hh_output(skb);
 }
 
+static inline int neigh_output(struct neighbour *n, struct sk_buff *skb)
+{
+	struct hh_cache *hh = &n->hh;
+	if (hh->hh_len)
+		return neigh_hh_output(hh, skb);
+	else
+		return n->output(skb);
+}
+
 static inline struct neighbour *
 __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat)
 {

net/ipv4/ip_output.c

@@ -205,13 +205,9 @@ static inline int ip_finish_output2(struct sk_buff *skb)
 	}
 
 	neigh = dst->neighbour;
-	if (neigh) {
-		struct hh_cache *hh = &neigh->hh;
-		if (hh->hh_len)
-			return neigh_hh_output(hh, skb);
-		else
-			return neigh->output(skb);
-	}
+	if (neigh)
+		return neigh_output(neigh, skb);
+
 	if (net_ratelimit())
 		printk(KERN_DEBUG "ip_finish_output2: No header cache and no neighbour!\n");
 	kfree_skb(skb);

net/ipv6/ip6_output.c

@@ -136,13 +136,9 @@ static int ip6_finish_output2(struct sk_buff *skb)
 	}
 
 	neigh = dst->neighbour;
-	if (neigh) {
-		struct hh_cache *hh = &neigh->hh;
-		if (hh->hh_len)
-			return neigh_hh_output(hh, skb);
-		else
-			return neigh->output(skb);
-	}
+	if (neigh)
+		return neigh_output(neigh, skb);
+
 	IP6_INC_STATS_BH(dev_net(dst->dev),
 			 ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
 	kfree_skb(skb);