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netfilter: xt_connlimit: fix accouning when receive RST packet in ESTABLISHED state

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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@gmail.com>
Acked-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dong Wei 2008-06-04 09:57:51 -07:00 committed by David S. Miller
parent ab32cd793d
commit d2ee3f2c4b
1 changed files with 2 additions and 1 deletions
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3
net/netfilter/xt_connlimit.c
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@ -73,7 +73,8 @@ connlimit_iphash6(const union nf_inet_addr *addr,
static inline bool already_closed(const struct nf_conn *conn)
{
if (nf_ct_protonum(conn) == 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;
}