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linux/net
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Florian Westphal 961a14671f netfilter: nf_conntrack: avoid large timeout for mid-stream pickup 
commit 6547a22187 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>
2014-10-05 14:54:15 -07:00
..
9p 9p/trans_virtio.c: Fix broken zero-copy on vmalloc() buffers 2014-03-06 21:30:03 -08:00
802 net/802/mrp: fix lockdep splat 2013-05-14 13:02:30 -07:00
8021q 8021q: fix a potential memory leak 2014-07-28 08:00:04 -07:00
appletalk appletalk: Fix socket referencing in skb 2014-07-28 08:00:05 -07:00
atm net: rework recvmsg handler msg_name and msg_namelen logic 2013-12-08 07:29:25 -08:00
ax25 net: rework recvmsg handler msg_name and msg_namelen logic 2013-12-08 07:29:25 -08:00
batman-adv batman-adv: set up network coding packet handlers during module init 2013-11-20 12:27:47 -08:00
bluetooth Bluetooth: Avoid use of session socket after the session gets freed 2014-09-17 09:04:00 -07:00
bridge bridge: Handle IFLA_ADDRESS correctly when creating bridge device 2014-05-30 21:52:16 -07:00
caif net: rework recvmsg handler msg_name and msg_namelen logic 2013-12-08 07:29:25 -08:00
can net: Use netlink_ns_capable to verify the permisions of netlink messages 2014-06-26 15:12:37 -04:00
ceph libceph: gracefully handle large reply messages from the mon 2014-09-17 09:04:02 -07:00
core iovec: make sure the caller actually wants anything in memcpy_fromiovecend 2014-08-14 09:24:15 +08:00
dcb net: Use netlink_ns_capable to verify the permisions of netlink messages 2014-06-26 15:12:37 -04:00
dccp net:dccp: do not report ICMP redirects to user space 2013-10-13 16:08:30 -07:00
decnet net: Use netlink_ns_capable to verify the permisions of netlink messages 2014-06-26 15:12:37 -04:00
dns_resolver dns_resolver: Null-terminate the right string 2014-07-28 08:00:06 -07:00
dsa dsa: fix freeing of sparse port allocation 2013-03-25 12:23:41 -04:00
ethernet net: add ETH_P_802_3_MIN 2013-03-28 01:20:42 -04:00
ieee802154 6lowpan: fix lockdep splats 2014-03-06 21:30:02 -08:00
ipv4 tcp: Fix integer-overflow in TCP vegas 2014-08-14 09:24:15 +08:00
ipv6 ip: make IP identifiers less predictable 2014-08-14 09:24:15 +08:00
ipx net: rework recvmsg handler msg_name and msg_namelen logic 2013-12-08 07:29:25 -08:00
irda net: rework recvmsg handler msg_name and msg_namelen logic 2013-12-08 07:29:25 -08:00
iucv af_iucv: wrong mapping of sent and confirmed skbs 2014-06-30 20:09:40 -07:00
key net: rework recvmsg handler msg_name and msg_namelen logic 2013-12-08 07:29:25 -08:00
l2tp net/l2tp: don't fall back on UDP [get|set]sockopt 2014-08-07 14:30:27 -07:00
lapb net/lapb: remove depends on CONFIG_EXPERIMENTAL 2013-01-11 11:40:01 -08:00
llc net: llc: fix use after free in llc_ui_recvmsg 2014-01-15 15:28:50 -08:00
mac80211 Revert "mac80211: disable uAPSD if all ACs are under ACM" 2014-10-05 14:54:13 -07:00
mac802154 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-04-30 03:55:20 -04:00
netfilter netfilter: nf_conntrack: avoid large timeout for mid-stream pickup 2014-10-05 14:54:15 -07:00
netlabel netlabel: improve domain mapping validation 2013-05-19 14:49:55 -07:00
netlink netlink: Fix handling of error from netlink_dump(). 2014-07-28 08:00:05 -07:00
netrom net: rework recvmsg handler msg_name and msg_namelen logic 2013-12-08 07:29:25 -08:00
nfc net: rework recvmsg handler msg_name and msg_namelen logic 2013-12-08 07:29:25 -08:00
openvswitch openvswitch: Remove unneeded ovs_netdev_get_ifindex() 2013-04-30 00:19:11 -04:00
packet net: Use netlink_ns_capable to verify the permisions of netlink messages 2014-06-26 15:12:37 -04:00
phonet net: Use netlink_ns_capable to verify the permisions of netlink messages 2014-06-26 15:12:37 -04:00
rds rds: prevent dereference of a NULL device in rds_iw_laddr_check 2014-04-14 06:42:18 -07:00
rfkill Merge branch 'for-john' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next 2013-04-22 14:58:14 -04:00
rose net: rose: restore old recvmsg behavior 2014-01-15 15:28:49 -08:00
rxrpc net: rework recvmsg handler msg_name and msg_namelen logic 2013-12-08 07:29:25 -08:00
sched net: Use netlink_ns_capable to verify the permisions of netlink messages 2014-06-26 15:12:37 -04:00
sctp sctp: fix possible seqlock seadlock in sctp_packet_transmit() 2014-08-14 09:24:15 +08:00
sunrpc svcrdma: Select NFSv4.1 backchannel transport based on forward channel 2014-09-05 16:28:37 -07:00
tipc tipc: clear 'next'-pointer of message fragments before reassembly 2014-07-28 08:00:05 -07:00
unix net: unix: non blocking recvmsg() should not return -EINTR 2014-04-14 06:42:15 -07:00
vmw_vsock net: rework recvmsg handler msg_name and msg_namelen logic 2013-12-08 07:29:25 -08:00
wimax
wireless cfg80211: fix mic_failure tracing 2014-08-07 14:30:25 -07:00
x25 net: rework recvmsg handler msg_name and msg_namelen logic 2013-12-08 07:29:25 -08:00
xfrm net: Use netlink_ns_capable to verify the permisions of netlink messages 2014-06-26 15:12:37 -04:00
compat.c net: sendmsg: fix NULL pointer dereference 2014-08-14 09:24:15 +08:00
Kconfig netlink: kconfig: move mmap i/o into netlink kconfig 2013-05-01 15:02:42 -04:00
Makefile VSOCK: Introduce VM Sockets 2013-02-10 19:41:08 -05:00
nonet.c
socket.c net: socket: error on a negative msg_namelen 2014-04-14 06:42:16 -07:00
sysctl_net.c net: Update the sysctl permissions handler to test effective uid/gid 2013-10-13 16:08:34 -07:00