IPVS: Add handling of incoming ICMPV6 messages

From: Julius Volz <[email protected]>

IPVS: Add handling of incoming ICMPV6 messages

Add handling of incoming ICMPv6 messages.
This follows the handling of IPv4 ICMP messages.

Amongst ther things this problem allows IPVS to behave sensibly when an ICMPV6_PKT_TOOBIG message is received:

This message is received when a realserver sends a packet >PMTU to the client. The hop on this path with insufficient MTU will generate an ICMPv6 Packet Too Big message back to the VIP. The LVS server receives this message, but the call to the function handling this has been missing. Thus, IPVS fails to forward the message to the real server, which then does not adjust the path MTU. This patch adds the missing call to ip_vs_in_icmp_v6() in ip_vs_in() to handle this situation.

Thanks to Rob Gallagher from HEAnet for reporting this issue and for testing this patch in production (with direct routing mode).

---
 net/netfilter/ipvs/ip_vs_core.c |   23 +++++++++++++++++------
 1 files changed, 17 insertions(+), 6 deletions(-)

Changelog
---------

* Fri, 24 Jul 2009 12:47:16 +1000
Initial post to netdev

* Mon, 31 Aug 2009 17:53:40 +1000
Tweaked commit message as per feedback

index 8dddb17..5750800 100644
@@ -1274,13 +1274,24 @@ ip_vs_in(unsigned int hooknum, struct sk_buff *skb,
 		return NF_ACCEPT;
 	}
 
-	if (unlikely(iph.protocol == IPPROTO_ICMP)) {
-		int related, verdict = ip_vs_in_icmp(skb, &related, hooknum);
+#ifdef CONFIG_IP_VS_IPV6
+	if (af == AF_INET6) {
+		if (unlikely(iph.protocol == IPPROTO_ICMPV6)) {
+			int related, verdict = ip_vs_in_icmp_v6(skb, &related, hooknum);
 
-		if (related)
-			return verdict;
-		ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
-	}
+			if (related)
+				return verdict;
+			ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
+		}
+	} else
+#endif
+		if (unlikely(iph.protocol == IPPROTO_ICMP)) {
+			int related, verdict = ip_vs_in_icmp(skb, &related, hooknum);
+
+			if (related)
+				return verdict;
+			ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
+		}
 
 	/* Protocol supported? */
 	pp = ip_vs_proto_get(iph.protocol);

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Applied, thanks.