diff options
authorFlorian Westphal <fw@strlen.de>2013-06-13 17:31:28 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-10-05 14:54:15 -0700
commit961a14671f6f79285672b76740eb87eb44ff5058 (patch)
parent5c95fef642043842d7168ee3ae662f80a84fb285 (diff)
netfilter: nf_conntrack: avoid large timeout for mid-stream pickup
commit 6547a221871f139cc56328a38105d47c14874cbe upstream. When loose tracking is enabled (default), non-syn packets cause creation of new conntracks in established state with default timeout for established state (5 days). This causes the table to fill up with UNREPLIED when the 'new ack' packet happened to be the last-ack of a previous, already timed-out connection. Consider: A 192.168.x.52792 > 10.184.y.80: F, 426:426(0) ack 9237 win 255 B 10.184.y.80 > 192.168.x.52792: ., ack 427 win 123 <61 second pause> C 10.184.y.80 > 192.168.x.52792: F, 9237:9237(0) ack 427 win 123 D 192.168.x.52792 > 10.184.y.80: ., ack 9238 win 255 B moves conntrack to CLOSE_WAIT and will kill it after 60 second timeout, C is ignored (FIN set), but last packet (D) causes new ct with 5-days timeout. Use UNACK timeout (5 minutes) instead to get rid of these entries sooner when in ESTABLISHED state without having seen traffic in both directions. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Cc: Florian Koch <florian.koch1981@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 6 insertions, 0 deletions
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 4d4d8f1d01fc..7dcc376eea5f 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -1043,6 +1043,12 @@ static int tcp_packet(struct nf_conn *ct,
nf_ct_kill_acct(ct, ctinfo, skb);
return NF_ACCEPT;
+ /* ESTABLISHED without SEEN_REPLY, i.e. mid-connection
+ * pickup with loose=1. Avoid large ESTABLISHED timeout.
+ */
+ if (new_state == TCP_CONNTRACK_ESTABLISHED &&
+ timeout > timeouts[TCP_CONNTRACK_UNACK])
+ timeout = timeouts[TCP_CONNTRACK_UNACK];
} else if (!test_bit(IPS_ASSURED_BIT, &ct->status)
&& (old_state == TCP_CONNTRACK_SYN_RECV