ipvs: remove extra lookups for ICMP packets

Remove code that should not be called anymore.
Now when ip_vs_out handles replies for local clients at
LOCAL_IN hook we do not need to call conn_out_get and
handle_response_icmp from ip_vs_in_icmp* because such
lookups were already performed for the ICMP packet and no
connection was found.

Signed-off-by: Julian Anastasov <[e-mail]>
Signed-off-by: Simon Horman <[e-mail]>

net/netfilter/ipvs/ip_vs_core.c

···
 #endif
 
 /* Handle relevant response ICMP messages - forward to the right
- * destination host. Used for NAT and local client.
+ * destination host.
  */
 static int handle_response_icmp(int af, struct sk_buff *skb,
 				union nf_inet_addr *snet,
···
 }
 
 /* Handle response packets: rewrite addresses and send away...
- * Used for NAT and local client.
  */
 static unsigned int
 handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
···
 	struct ip_vs_protocol *pp;
 	struct ip_vs_proto_data *pd;
 	unsigned int offset, ihl, verdict;
-	union nf_inet_addr snet;
 
 	*related = 1;
 
···
 	ip_vs_fill_iphdr(AF_INET, cih, &ciph);
 	/* The embedded headers contain source and dest in reverse order */
 	cp = pp->conn_in_get(AF_INET, skb, &ciph, offset, 1);
-	if (!cp) {
-		/* The packet could also belong to a local client */
-		cp = pp->conn_out_get(AF_INET, skb, &ciph, offset, 1);
-		if (cp) {
-			snet.ip = iph->saddr;
-			return handle_response_icmp(AF_INET, skb, &snet,
-						    cih->protocol, cp, pp,
-						    offset, ihl);
-		}
+	if (!cp)
 		return NF_ACCEPT;
-	}
 
 	verdict = NF_DROP;
 
···
 	struct ip_vs_protocol *pp;
 	struct ip_vs_proto_data *pd;
 	unsigned int offset, verdict;
-	union nf_inet_addr snet;
 	struct rt6_info *rt;
 
 	*related = 1;
···
 	ip_vs_fill_iphdr(AF_INET6, cih, &ciph);
 	/* The embedded headers contain source and dest in reverse order */
 	cp = pp->conn_in_get(AF_INET6, skb, &ciph, offset, 1);
-	if (!cp) {
-		/* The packet could also belong to a local client */
-		cp = pp->conn_out_get(AF_INET6, skb, &ciph, offset, 1);
-		if (cp) {
-			ipv6_addr_copy(&snet.in6, &iph->saddr);
-			return handle_response_icmp(AF_INET6, skb, &snet,
-						    cih->nexthdr,
-						    cp, pp, offset,
-						    sizeof(struct ipv6hdr));
-		}
+	if (!cp)
 		return NF_ACCEPT;
-	}
 
 	verdict = NF_DROP;