From: Jozsef Kadlecsik Date: Thu, 18 Oct 2007 12:20:12 +0000 (-0700) Subject: [NETFILTER]: nf_conntrack_tcp: fix connection reopening fix X-Git-Tag: v2.6.24-rc1~294^2~1 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bc34b841556aad437baf4199744e55500bfa2088;p=linux-2.6 [NETFILTER]: nf_conntrack_tcp: fix connection reopening fix If one side aborts an established connection, the entry still lingers for 10s in conntrack for the late packets. Allow to open up the connection again for the party which sent the RST packet. Signed-off-by: Jozsef Kadlecsik Tested-by: Krzysztof Piotr Oledzki Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c index c707534597..4dc23ab3a3 100644 --- a/net/netfilter/nf_conntrack_proto_tcp.c +++ b/net/netfilter/nf_conntrack_proto_tcp.c @@ -834,10 +834,12 @@ static int tcp_packet(struct nf_conn *conntrack, case TCP_CONNTRACK_SYN_SENT: if (old_state < TCP_CONNTRACK_TIME_WAIT) break; - if (conntrack->proto.tcp.seen[!dir].flags & - IP_CT_TCP_FLAG_CLOSE_INIT) { - /* Attempt to reopen a closed connection. - * Delete this connection and look up again. */ + if ((conntrack->proto.tcp.seen[!dir].flags & + IP_CT_TCP_FLAG_CLOSE_INIT) + || (conntrack->proto.tcp.last_dir == dir + && conntrack->proto.tcp.last_index == TCP_RST_SET)) { + /* Attempt to reopen a closed/aborted connection. + * Delete this connection and look up again. */ write_unlock_bh(&tcp_lock); if (del_timer(&conntrack->timeout)) conntrack->timeout.function((unsigned long) @@ -925,6 +927,7 @@ static int tcp_packet(struct nf_conn *conntrack, in_window: /* From now on we have got in-window packets */ conntrack->proto.tcp.last_index = index; + conntrack->proto.tcp.last_dir = dir; pr_debug("tcp_conntracks: "); NF_CT_DUMP_TUPLE(tuple);