When a conntrack entry is destroyed in process context and destruction
is interrupted by packet processing and the packet is an attempt to
reopen a closed connection, TCP conntrack tries to kill the old entry
itself and returns NF_REPEAT to pass the packet through the hook
again. This may lead to an endless loop: TCP conntrack repeatedly
finds the old entry, but can not kill it itself since destruction
is already in progress, but destruction in process context can not
complete since TCP conntrack is keeping the CPU busy.
Drop the packet in TCP conntrack if we can't kill the connection
ourselves to avoid this.
Reported by: hemao77@gmail.com [ Kernel bugzilla #11058 ]
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Lost connections was reported by Thomas Bätzler (running 2.6.25 kernel) on
the netfilter mailing list (see the thread "Weird nat/conntrack Problem
with PASV FTP upload"). He provided tcpdump recordings which helped to
find a long lingering bug in conntrack.
In TCP connection tracking, checking the lower bound of valid ACK could
lead to mark valid packets as INVALID because:
- We have got a "higher or equal" inequality, but the test checked
the "higher" condition only; fixed.
- If the packet contains a SACK option, it could occur that the ACK
value was before the left edge of our (S)ACK "window": if a previous
packet from the other party intersected the right edge of the window
of the receiver, we could move forward the window parameters beyond
accepting a valid ack. Therefore in this patch we check the rightmost
SACK edge instead of the ACK value in the lower bound of valid (S)ACK
test.
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
The H.245 helper is not registered/unregistered, but assigned to
connections manually from the Q.931 helper. This means on unload
existing expectations and connections using the helper are not
cleaned up, leading to the following oops on module unload:
CPU 0 Unable to handle kernel paging request at virtual address c00a6828, epc == 802224dc, ra == 801d4e7c
Oops[#1]:
Cpu 0
$ 0 : 00000000 00000000 00000004 c00a67f0
$ 4 : 802a5ad0 81657e00 00000000 00000000
$ 8 : 00000008 801461c8 00000000 80570050
$12 : 819b0280 819b04b0 00000006 00000000
$16 : 802a5a60 80000000 80b46000 80321010
$20 : 00000000 00000004 802a5ad0 00000001
$24 : 00000000 802257a8
$28 : 802a4000 802a59e8 00000004 801d4e7c
Hi : 0000000b
Lo : 00506320
epc : 802224dc ip_conntrack_help+0x38/0x74 Tainted: P
ra : 801d4e7c nf_iterate+0xbc/0x130
Status: 1000f403 KERNEL EXL IE
Cause : 00800008
BadVA : c00a6828
PrId : 00019374
Modules linked in: ip_nat_pptp ip_conntrack_pptp ath_pktlog wlan_acl wlan_wep wlan_tkip wlan_ccmp wlan_xauth ath_pci ath_dev ath_dfs ath_rate_atheros wlan ath_hal ip_nat_tftp ip_conntrack_tftp ip_nat_ftp ip_conntrack_ftp pppoe ppp_async ppp_deflate ppp_mppe pppox ppp_generic slhc
Process swapper (pid: 0, threadinfo=802a4000, task=802a6000)
Stack : 801e7d98 00000004 802a5a60 80000000 801d4e7c 801d4e7c 802a5ad0 00000004
00000000 00000000 801e7d98 00000000 00000004 802a5ad0 00000000 00000010
801e7d98 80b46000 802a5a60 80320000 80000000 801d4f8c 802a5b00 00000002
80063834 00000000 80b46000 802a5a60 801e7d98 80000000 802ba854 00000000
81a02180 80b7e260 81a021b0 819b0000 819b0000 80570056 00000000 00000001
...
Call Trace:
[<801e7d98>] ip_finish_output+0x0/0x23c
[<801d4e7c>] nf_iterate+0xbc/0x130
[<801d4e7c>] nf_iterate+0xbc/0x130
[<801e7d98>] ip_finish_output+0x0/0x23c
[<801e7d98>] ip_finish_output+0x0/0x23c
[<801d4f8c>] nf_hook_slow+0x9c/0x1a4
One way to fix this would be to split helper cleanup from the unregistration
function and invoke it for the H.245 helper, but since ctnetlink needs to be
able to find the helper for synchonization purposes, a better fix is to
register it normally and make sure its not assigned to connections during
helper lookup. The missing l3num initialization is enough for this, this
patch changes it to use AF_UNSPEC to make it more explicit though.
Reported-by: liannan <liannan@twsz.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Properly free h323_buffer when helper registration fails.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Fix three ct_extend/NAT extension related races:
- When cleaning up the extension area and removing it from the bysource hash,
the nat->ct pointer must not be set to NULL since it may still be used in
a RCU read side
- When replacing a NAT extension area in the bysource hash, the nat->ct
pointer must be assigned before performing the replacement
- When reallocating extension storage in ct_extend, the old memory must
not be freed immediately since it may still be used by a RCU read side
Possibly fixes https://bugzilla.redhat.com/show_bug.cgi?id=449315
and/or http://bugzilla.kernel.org/show_bug.cgi?id=10875
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
When creation of a new conntrack entry in ctnetlink fails after having
set up the NAT mappings, the conntrack has an extension area allocated
that is not getting properly destroyed when freeing the conntrack again.
This means the NAT extension is still in the bysource hash, causing a
crash when walking over the hash chain the next time:
BUG: unable to handle kernel paging request at 00120fbd
IP: [<c03d394b>] nf_nat_setup_info+0x221/0x58a
*pde = 00000000
Oops: 0000 [#1] PREEMPT SMP
Pid: 2795, comm: conntrackd Not tainted (2.6.26-rc5 #1)
EIP: 0060:[<c03d394b>] EFLAGS: 00010206 CPU: 1
EIP is at nf_nat_setup_info+0x221/0x58a
EAX: 00120fbd EBX: 00120fbd ECX: 00000001 EDX: 00000000
ESI: 0000019e EDI: e853bbb4 EBP: e853bbc8 ESP: e853bb78
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process conntrackd (pid: 2795, ti=e853a000 task=f7de10f0 task.ti=e853a000)
Stack: 00000000 e853bc2c e85672ec 00000008 c0561084 63c1db4a 00000000 00000000
00000000 0002e109 61d2b1c3 00000000 00000000 00000000 01114e22 61d2b1c3
00000000 00000000 f7444674 e853bc04 00000008 c038e728 0000000a f7444674
Call Trace:
[<c038e728>] nla_parse+0x5c/0xb0
[<c0397c1b>] ctnetlink_change_status+0x190/0x1c6
[<c0397eec>] ctnetlink_new_conntrack+0x189/0x61f
[<c0119aee>] update_curr+0x3d/0x52
[<c03902d1>] nfnetlink_rcv_msg+0xc1/0xd8
[<c0390228>] nfnetlink_rcv_msg+0x18/0xd8
[<c0390210>] nfnetlink_rcv_msg+0x0/0xd8
[<c038d2ce>] netlink_rcv_skb+0x2d/0x71
[<c0390205>] nfnetlink_rcv+0x19/0x24
[<c038d0f5>] netlink_unicast+0x1b3/0x216
...
Move invocation of the extension destructors to nf_conntrack_free()
to fix this problem.
Fixes http://bugzilla.kernel.org/show_bug.cgi?id=10875
Reported-and-Tested-by: Krzysztof Piotr Oledzki <ole@ans.pl>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
The message "nf_log_packet: can't log since no backend logging module loaded
in! Please either load one, or disable logging explicitly" was displayed for
each logged packet when no userspace application is listening to nflog events.
The message seems to warn for a problem with a kernel module missing but as
said before this is not the case. I thus propose to suppress the message (I
don't see any reason to flood the log because a user application has crashed.)
Signed-off-by: Eric Leblond <eric@inl.fr>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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>
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (73 commits)
net: Fix typo in net/core/sock.c.
ppp: Do not free not yet unregistered net device.
netfilter: xt_iprange: module aliases for xt_iprange
netfilter: ctnetlink: dump conntrack ID in event messages
irda: Fix a misalign access issue. (v2)
sctp: Fix use of uninitialized pointer
cipso: Relax too much careful cipso hash function.
tcp FRTO: work-around inorder receivers
tcp FRTO: Fix fallback to conventional recovery
New maintainer for Intel ethernet adapters
DM9000: Use delayed work to update MII PHY state
DM9000: Update and fix driver debugging messages
DM9000: Add __devinit and __devexit attributes to probe and remove
sky2: fix simple define thinko
[netdrvr] sfc: sfc: Add self-test support
[netdrvr] sfc: Increment rx_reset when reported as driver event
[netdrvr] sfc: Remove unused macro EFX_XAUI_RETRAIN_MAX
[netdrvr] sfc: Fix code formatting
[netdrvr] sfc: Remove kernel-doc comments for removed members of struct efx_nic
[netdrvr] sfc: Remove garbage from comment
...
Using iptables 1.3.8 with kernel 2.6.25, rules which include '-m
iprange' don't automatically pull in xt_iprange module. Below patch
adds module aliases to fix that. Patch against latest -git, but seems
like a good candidate for -stable also.
Signed-off-by: Phil Oester <kernel@linuxace.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Conntrack ID is not put (anymore ?) in event messages. This causes
current ulogd2 code to fail because it uses the ID to build a hash in
userspace. This hash is used to be able to output the starting time of
a connection.
Conntrack ID can be used in userspace application to maintain an easy
match between kernel connections list and userspace one. It may worth
to add it if there is no performance related issue.
[ Patrick: it was never included in events, but really should be ]
Signed-off-by: Eric Leblond <eric@inl.fr>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (32 commits)
net: Added ASSERT_RTNL() to dev_open() and dev_close().
can: Fix can_send() handling on dev_queue_xmit() failures
netns: Fix arbitrary net_device-s corruptions on net_ns stop.
netfilter: Kconfig: default DCCP/SCTP conntrack support to the protocol config values
netfilter: nf_conntrack_sip: restrict RTP expect flushing on error to last request
macvlan: Fix memleak on device removal/crash on module removal
net/ipv4: correct RFC 1122 section reference in comment
tcp FRTO: SACK variant is errorneously used with NewReno
e1000e: don't return half-read eeprom on error
ucc_geth: Don't use RX clock as TX clock.
cxgb3: Use CAP_SYS_RAWIO for firmware
pcnet32: delete non NAPI code from driver.
fs_enet: Fix a memory leak in fs_enet_mdio_probe
[netdrvr] eexpress: IPv6 fails - multicast problems
3c59x: use netstats in net_device structure
3c980-TX needs EXTRA_PREAMBLE
fix warning in drivers/net/appletalk/cops.c
e1000e: Add support for BM PHYs on ICH9
uli526x: fix endianness issues in the setup frame
uli526x: initialize the hardware prior to requesting interrupts
...
When conntrack and DCCP/SCTP protocols are enabled, chances are good
that people also want DCCP/SCTP conntrack and NAT support.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Some Inovaphone PBXs exhibit very stange behaviour: when dialing for
example "123", the device sends INVITE requests for "1", "12" and
"123" back to back. The first requests will elicit error responses
from the receiver, causing the SIP helper to flush the RTP
expectations even though we might still see a positive response.
Note the sequence number of the last INVITE request that contained a
media description and only flush the expectations when receiving a
negative response for that sequence number.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (47 commits)
rose: Wrong list_lock argument in rose_node seqops
netns: Fix reassembly timer to use the right namespace
netns: Fix device renaming for sysfs
bnx2: Update version to 1.7.5.
bnx2: Update RV2P firmware for 5709.
bnx2: Zero out context memory for 5709.
bnx2: Fix register test on 5709.
bnx2: Fix remote PHY initial link state.
bnx2: Refine remote PHY locking.
bridge: forwarding table information for >256 devices
tg3: Update version to 3.92
tg3: Add link state reporting to UMP firmware
tg3: Fix ethtool loopback test for 5761 BX devices
tg3: Fix 5761 NVRAM sizes
tg3: Use constant 500KHz MI clock on adapters with a CPMU
hci_usb.h: fix hard-to-trigger race
dccp: ccid2.c, ccid3.c use clamp(), clamp_t()
net: remove NR_CPUS arrays in net/core/dev.c
net: use get/put_unaligned_* helpers
bluetooth: use get/put_unaligned_* helpers
...
Replace proc_net_fops_create with proc_create_data.
Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Replace create_proc_entry with specially created for this purpose proc_create.
Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Simply replace proc_create and further data assigned with proc_create_data.
Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
