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Subject[ 73/89] netfilter: nf_ct_reasm: fix conntrack reassembly expire code
Date
3.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Haibo Xi <haibbo@gmail.com>

commit 97cf00e93cc24898493e7a058105e3215257ee04 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
net/ipv6/netfilter/nf_conntrack_reasm.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- 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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