From 97cf00e93cc24898493e7a058105e3215257ee04 Mon Sep 17 00:00:00 2001
From: Haibo Xi <haibbo@gmail.com>
Date: Thu, 6 Dec 2012 23:42:17 +0000
Subject: netfilter: nf_ct_reasm: fix conntrack reassembly expire code

Commit b836c99fd6c9 (ipv6: unify conntrack reassembly expire
code with standard one) use the standard IPv6 reassembly
code(ip6_expire_frag_queue) to handle conntrack reassembly expire.

In ip6_expire_frag_queue, it invoke dev_get_by_index_rcu to get
which device received this expired packet.so we must save ifindex
when NF_conntrack get this packet.

With this patch applied, I can see ICMP Time Exceeded sent
from the receiver when the sender sent out 1/2 fragmented
IPv6 packet.

Signed-off-by: Haibo Xi <haibbo@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/ipv6/netfilter/nf_conntrack_reasm.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'net/ipv6')

diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index 22c8ea9..3dacecc 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -311,7 +311,10 @@ found:
 	else
 		fq->q.fragments = skb;
 
-	skb->dev = NULL;
+	if (skb->dev) {
+		fq->iif = skb->dev->ifindex;
+		skb->dev = NULL;
+	}
 	fq->q.stamp = skb->tstamp;
 	fq->q.meat += skb->len;
 	if (payload_len > fq->q.max_size)
-- 
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