[patch 38/50] netfilter: xt_connlimit: fix accouning when receive RST packet in ESTABLISHED state

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Patrick McHardy <kaber@xxxxxxxxx>

upstream commit: d2ee3f2c4b1db1320c1efb4dcaceeaf6c7e6c2d3

In xt_connlimit match module, the counter of an IP is decreased when
the TCP packet is go through the chain with ip_conntrack state TW.
Well, it's very natural that the server and client close the socket
with FIN packet. But when the client/server close the socket with RST
packet(using so_linger), the counter for this connection still exsit.
The following patch can fix it which is based on linux-2.6.25.4

Signed-off-by: Dong Wei <dwei.zh@xxxxxxxxx>
Acked-by: Jan Engelhardt <jengelh@xxxxxxxxxx>
Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---

 net/netfilter/xt_connlimit.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/netfilter/xt_connlimit.c
+++ b/net/netfilter/xt_connlimit.c
@@ -75,7 +75,8 @@ static inline bool already_closed(const 
 	u_int16_t proto = conn->tuplehash[0].tuple.dst.protonum;
 
 	if (proto == IPPROTO_TCP)
-		return conn->proto.tcp.state == TCP_CONNTRACK_TIME_WAIT;
+		return conn->proto.tcp.state == TCP_CONNTRACK_TIME_WAIT ||
+		       conn->proto.tcp.state == TCP_CONNTRACK_CLOSE;
 	else
 		return 0;
 }

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