Consolidate equal handlers in tunnel4.c

index b662a9e..c85547d 100644
@@ -101,14 +101,14 @@ void iptunnel_xmit(struct sk_buff *skb, struct rtable *rt,
 
 EXPORT_SYMBOL(iptunnel_xmit);
 
-static int tunnel4_rcv(struct sk_buff *skb)
+static int tunnel_rcv(struct xfrm_tunnel *handlers, struct sk_buff *skb)
 {
 	struct xfrm_tunnel *handler;
 
 	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
 		goto drop;
 
-	for (handler = tunnel4_handlers; handler; handler = handler->next)
+	for (handler = handlers; handler; handler = handler->next)
 		if (!handler->handler(skb))
 			return 0;
 

@@ -119,43 +119,36 @@ drop:
 	return 0;
 }
 
+static int tunnel4_rcv(struct sk_buff *skb)
+{
+	return tunnel_rcv(tunnel4_handlers, skb);
+}
+
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 static int tunnel64_rcv(struct sk_buff *skb)
 {
-	struct xfrm_tunnel *handler;
-
-	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
-		goto drop;
-
-	for (handler = tunnel64_handlers; handler; handler = handler->next)
-		if (!handler->handler(skb))
-			return 0;
-
-	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
-
-drop:
-	kfree_skb(skb);
-	return 0;
+	return tunnel_rcv(tunnel64_handlers, skb);
 }
 #endif
 
-static void tunnel4_err(struct sk_buff *skb, u32 info)
+static void tunnel_err(struct xfrm_tunnel *handlers, struct sk_buff *skb, u32 i)
 {
 	struct xfrm_tunnel *handler;
 
-	for (handler = tunnel4_handlers; handler; handler = handler->next)
-		if (!handler->err_handler(skb, info))
+	for (handler = handlers; handler; handler = handler->next)
+		if (!handler->err_handler(skb, i))
 			break;
 }
 
+static void tunnel4_err(struct sk_buff *skb, u32 info)
+{
+	tunnel_err(tunnel4_handlers, skb, info);
+}
+
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 static void tunnel64_err(struct sk_buff *skb, u32 info)
 {
-	struct xfrm_tunnel *handler;
-
-	for (handler = tunnel64_handlers; handler; handler = handler->next)
-		if (!handler->err_handler(skb, info))
-			break;
+	tunnel_err(tunnel64_handlers, skb, info);
 }
 #endif