25 Sep, 2020
1 commit
-
All TC actions call tcf_idr_insert() for new action at the end
of their ->init(), so we can actually move it to a central place
in tcf_action_init_1().And once the action is inserted into the global IDR, other parallel
process could free it immediately as its refcnt is still 1, so we can
not fail after this, we need to move it after the goto action
validation to avoid handling the failure case after insertion.This is found during code review, is not directly triggered by syzbot.
And this prepares for the next patch.Cc: Vlad Buslov
Cc: Jamal Hadi Salim
Cc: Jiri Pirko
Signed-off-by: Cong Wang
Signed-off-by: David S. Miller
20 Jun, 2020
1 commit
-
This patch adds a drop frames counter to tc flower offloading.
Reporting h/w dropped frames is necessary for some actions.
Some actions like police action and the coming introduced stream gate
action would produce dropped frames which is necessary for user. Status
update shows how many filtered packets increasing and how many dropped
in those packets.v2: Changes
- Update commit comments suggest by Jiri Pirko.Signed-off-by: Po Liu
Reviewed-by: Simon Horman
Reviewed-by: Vlad Buslov
Signed-off-by: David S. Miller
31 Oct, 2019
5 commits
-
Extend struct tc_action with new "tcfa_flags" field. Set the field in
tcf_idr_create() function and provide new helper
tcf_idr_create_from_flags() that derives 'cpustats' boolean from flags
value. Update individual hardware-offloaded actions init() to pass their
"flags" argument to new helper in order to skip percpu stats allocation
when user requested it through flags.Signed-off-by: Vlad Buslov
Signed-off-by: David S. Miller -
Extend TCA_ACT space with nla_bitfield32 flags. Add
TCA_ACT_FLAGS_NO_PERCPU_STATS as the only allowed flag. Parse the flags in
tcf_action_init_1() and pass resulting value as additional argument to
a_o->init().Signed-off-by: Vlad Buslov
Signed-off-by: David S. Miller -
Extract common code that increments cpu_qstats counters into standalone act
API functions. Change hardware offloaded actions that use percpu counter
allocation to use the new functions instead of accessing cpu_qstats
directly.This commit doesn't change functionality.
Signed-off-by: Vlad Buslov
Acked-by: Jiri Pirko
Signed-off-by: David S. Miller -
Extract common code that increments cpu_bstats counter into standalone act
API function. Change hardware offloaded actions that use percpu counter
allocation to use the new function instead of incrementing cpu_bstats
directly.This commit doesn't change functionality.
Signed-off-by: Vlad Buslov
Acked-by: Jiri Pirko
Signed-off-by: David S. Miller -
Currently, all implementations of tc_action_ops->stats_update() callback
have almost exactly the same implementation of counters update
code (besides gact which also updates drop counter). In order to simplify
support for using both percpu-allocated and regular action counters
depending on run-time flag in following patches, extract action counters
update code into standalone function in act API.This commit doesn't change functionality.
Signed-off-by: Vlad Buslov
Acked-by: Jiri Pirko
Signed-off-by: David S. Miller
28 Aug, 2019
1 commit
-
The net pointer in struct xt_tgdtor_param is not explicitly
initialized therefore is still NULL when dereferencing it.
So we have to find a way to pass the correct net pointer to
ipt_destroy_target().The best way I find is just saving the net pointer inside the per
netns struct tcf_idrinfo, which could make this patch smaller.Fixes: 0c66dc1ea3f0 ("netfilter: conntrack: register hooks in netns when needed by ruleset")
Reported-and-tested-by: itugrok@yahoo.com
Cc: Jamal Hadi Salim
Cc: Jiri Pirko
Signed-off-by: Cong Wang
Signed-off-by: David S. Miller
06 Aug, 2019
1 commit
-
Currently init call of all actions (except ipt) init their 'parm'
structure as a direct pointer to nla data in skb. This leads to race
condition when some of the filter actions were initialized successfully
(and were assigned with idr action index that was written directly
into nla data), but then were deleted and retried (due to following
action module missing or classifier-initiated retry), in which case
action init code tries to insert action to idr with index that was
assigned on previous iteration. During retry the index can be reused
by another action that was inserted concurrently, which causes
unintended action sharing between filters.
To fix described race condition, save action idr index to temporary
stack-allocated variable instead on nla data.Fixes: 0190c1d452a9 ("net: sched: atomically check-allocate action")
Signed-off-by: Dmytro Linkin
Signed-off-by: Vlad Buslov
Acked-by: Cong Wang
Signed-off-by: David S. Miller
31 May, 2019
1 commit
-
Based on 1 normalized pattern(s):
this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later versionextracted by the scancode license scanner the SPDX license identifier
GPL-2.0-or-later
has been chosen to replace the boilerplate/reference in 3029 file(s).
Signed-off-by: Thomas Gleixner
Reviewed-by: Allison Randal
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman
28 Apr, 2019
1 commit
-
We currently have two levels of strict validation:
1) liberal (default)
- undefined (type >= max) & NLA_UNSPEC attributes accepted
- attribute length >= expected accepted
- garbage at end of message accepted
2) strict (opt-in)
- NLA_UNSPEC attributes accepted
- attribute length >= expected acceptedSplit out parsing strictness into four different options:
* TRAILING - check that there's no trailing data after parsing
attributes (in message or nested)
* MAXTYPE - reject attrs > max known type
* UNSPEC - reject attributes with NLA_UNSPEC policy entries
* STRICT_ATTRS - strictly validate attribute sizeThe default for future things should be *everything*.
The current *_strict() is a combination of TRAILING and MAXTYPE,
and is renamed to _deprecated_strict().
The current regular parsing has none of this, and is renamed to
*_parse_deprecated().Additionally it allows us to selectively set one of the new flags
even on old policies. Notably, the UNSPEC flag could be useful in
this case, since it can be arranged (by filling in the policy) to
not be an incompatible userspace ABI change, but would then going
forward prevent forgetting attribute entries. Similar can apply
to the POLICY flag.We end up with the following renames:
* nla_parse -> nla_parse_deprecated
* nla_parse_strict -> nla_parse_deprecated_strict
* nlmsg_parse -> nlmsg_parse_deprecated
* nlmsg_parse_strict -> nlmsg_parse_deprecated_strict
* nla_parse_nested -> nla_parse_nested_deprecated
* nla_validate_nested -> nla_validate_nested_deprecatedUsing spatch, of course:
@@
expression TB, MAX, HEAD, LEN, POL, EXT;
@@
-nla_parse(TB, MAX, HEAD, LEN, POL, EXT)
+nla_parse_deprecated(TB, MAX, HEAD, LEN, POL, EXT)@@
expression NLH, HDRLEN, TB, MAX, POL, EXT;
@@
-nlmsg_parse(NLH, HDRLEN, TB, MAX, POL, EXT)
+nlmsg_parse_deprecated(NLH, HDRLEN, TB, MAX, POL, EXT)@@
expression NLH, HDRLEN, TB, MAX, POL, EXT;
@@
-nlmsg_parse_strict(NLH, HDRLEN, TB, MAX, POL, EXT)
+nlmsg_parse_deprecated_strict(NLH, HDRLEN, TB, MAX, POL, EXT)@@
expression TB, MAX, NLA, POL, EXT;
@@
-nla_parse_nested(TB, MAX, NLA, POL, EXT)
+nla_parse_nested_deprecated(TB, MAX, NLA, POL, EXT)@@
expression START, MAX, POL, EXT;
@@
-nla_validate_nested(START, MAX, POL, EXT)
+nla_validate_nested_deprecated(START, MAX, POL, EXT)@@
expression NLH, HDRLEN, MAX, POL, EXT;
@@
-nlmsg_validate(NLH, HDRLEN, MAX, POL, EXT)
+nlmsg_validate_deprecated(NLH, HDRLEN, MAX, POL, EXT)For this patch, don't actually add the strict, non-renamed versions
yet so that it breaks compile if I get it wrong.Also, while at it, make nla_validate and nla_parse go down to a
common __nla_validate_parse() function to avoid code duplication.Ultimately, this allows us to have very strict validation for every
new caller of nla_parse()/nlmsg_parse() etc as re-introduced in the
next patch, while existing things will continue to work as is.In effect then, this adds fully strict validation for any new command.
Signed-off-by: Johannes Berg
Signed-off-by: David S. Miller
22 Mar, 2019
2 commits
-
the following script:
# tc qdisc add dev crash0 clsact
# tc filter add dev crash0 egress matchall \
> action gact pass index 90
# tc actions replace action gact \
> goto chain 42 index 90 cookie c1a0c1a0
# tc actions show action gacthad the following output:
Error: Failed to init TC action chain.
We have an error talking to the kernel
total acts 1action order 0: gact action goto chain 42
random type none pass val 0
index 90 ref 2 bind 1
cookie c1a0c1a0Then, the first packet transmitted by crash0 made the kernel crash:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
#PF error: [normal kernel read fault]
PGD 0 P4D 0
Oops: 0000 [#1] SMP PTI
CPU: 2 PID: 0 Comm: swapper/2 Not tainted 5.0.0-rc4.gotochain_crash+ #533
Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
RIP: 0010:tcf_action_exec+0xb8/0x100
Code: 00 00 00 20 74 1d 83 f8 03 75 09 49 83 c4 08 4d 39 ec 75 bc 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f c3 49 8b 97 a8 00 00 00 8b 12 48 89 55 00 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f c3
RSP: 0018:ffff8c2434703be0 EFLAGS: 00010246
RAX: 000000002000002a RBX: ffff8c23ed6d7e00 RCX: 000000000000005a
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8c23ed6d7e00
RBP: ffff8c2434703c80 R08: ffff8c243b639ac8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8c2429e68b00
R13: ffff8c2429e68b08 R14: 0000000000000001 R15: ffff8c2429c5a480
FS: 0000000000000000(0000) GS:ffff8c2434700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000002dc0e005 CR4: 00000000001606e0
Call Trace:
tcf_classify+0x58/0x120
__dev_queue_xmit+0x40a/0x890
? ip6_finish_output2+0x369/0x590
ip6_finish_output2+0x369/0x590
? ip6_output+0x68/0x110
ip6_output+0x68/0x110
? nf_hook.constprop.35+0x79/0xc0
mld_sendpack+0x16f/0x220
mld_ifc_timer_expire+0x195/0x2c0
? igmp6_timer_handler+0x70/0x70
call_timer_fn+0x2b/0x130
run_timer_softirq+0x3e8/0x440
? tick_sched_timer+0x37/0x70
__do_softirq+0xe3/0x2f5
irq_exit+0xf0/0x100
smp_apic_timer_interrupt+0x6c/0x130
apic_timer_interrupt+0xf/0x20
RIP: 0010:native_safe_halt+0x2/0x10
Code: 74 ff ff ff 7f f3 c3 65 48 8b 04 25 00 5c 01 00 f0 80 48 02 20 48 8b 00 a8 08 74 8b eb c1 90 90 90 90 90 90 90 90 90 90 fb f4 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 f4 c3 90 90 90 90 90 90
RSP: 0018:ffff9c8640387eb8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff8b2184f0 RBX: 0000000000000002 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000087 RDI: 0000000000000002
RBP: 0000000000000002 R08: 000eb57882b36cc3 R09: 0000000000000020
R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? __sched_text_end+0x1/0x1
default_idle+0x1c/0x140
do_idle+0x1c4/0x280
cpu_startup_entry+0x19/0x20
start_secondary+0x1a7/0x200
secondary_startup_64+0xa4/0xb0
Modules linked in: act_gact act_bpf veth ip6table_filter ip6_tables iptable_filter binfmt_misc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_generic ext4 snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core mbcache jbd2 snd_seq snd_seq_device snd_pcm aesni_intel crypto_simd cryptd glue_helper virtio_balloon joydev pcspkr snd_timer snd i2c_piix4 soundcore nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs ata_generic pata_acpi qxl drm_kms_helper syscopyarea virtio_net sysfillrect net_failover virtio_blk sysimgblt fb_sys_fops virtio_console ttm failover drm crc32c_intel serio_raw ata_piix libata floppy virtio_pci virtio_ring virtio dm_mirror dm_region_hash dm_log dm_mod [last unloaded: act_bpf]
CR2: 0000000000000000Validating the control action within tcf_gact_init() proved to fix the
above issue. A TDC selftest is added to verify the correct behavior.Fixes: db50514f9a9c ("net: sched: add termination action to allow goto chain")
Fixes: 97763dc0f401 ("net_sched: reject unknown tcfa_action values")
Signed-off-by: Davide Caratti
Signed-off-by: David S. Miller -
- pass a pointer to struct tcf_proto in each actions's init() handler,
to allow validating the control action, checking whether the chain
exists and (eventually) refcounting it.
- remove code that validates the control action after a successful call
to the action's init() handler, and replace it with a test that forbids
addition of actions having 'goto_chain' and NULL goto_chain pointer at
the same time.
- add tcf_action_check_ctrlact(), that will validate the control action
and eventually allocate the action 'goto_chain' within the init()
handler.
- add tcf_action_set_ctrlact(), that will assign the control action and
swap the current 'goto_chain' pointer with the new given one.This disallows 'goto_chain' on actions that don't initialize it properly
in their init() handler, i.e. calling tcf_action_check_ctrlact() after
successful IDR reservation and then calling tcf_action_set_ctrlact()
to assign 'goto_chain' and 'tcf_action' consistently.By doing this, the kernel does not leak anymore refcounts when a valid
'goto chain' handle is replaced in TC actions, causing kmemleak splats
like the following one:# tc chain add dev dd0 chain 42 ingress protocol ip flower \
> ip_proto tcp action drop
# tc chain add dev dd0 chain 43 ingress protocol ip flower \
> ip_proto udp action drop
# tc filter add dev dd0 ingress matchall \
> action gact goto chain 42 index 66
# tc filter replace dev dd0 ingress matchall \
> action gact goto chain 43 index 66
# echo scan >/sys/kernel/debug/kmemleak
unreferenced object 0xffff93c0ee09f000 (size 1024):
comm "tc", pid 2565, jiffies 4295339808 (age 65.426s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 08 00 06 00 00 00 00 00 00 00 00 00 ................
backtrace:
[] tc_ctl_chain+0x3d2/0x4c0
[] rtnetlink_rcv_msg+0x263/0x2d0
[] netlink_rcv_skb+0x4a/0x110
[] netlink_unicast+0x1a0/0x250
[] netlink_sendmsg+0x2c1/0x3c0
[] sock_sendmsg+0x36/0x40
[] ___sys_sendmsg+0x280/0x2f0
[] __sys_sendmsg+0x5e/0xa0
[] do_syscall_64+0x5b/0x180
[] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[] 0xffffffffffffffffFixes: db50514f9a9c ("net: sched: add termination action to allow goto chain")
Fixes: 97763dc0f401 ("net_sched: reject unknown tcfa_action values")
Signed-off-by: Davide Caratti
Signed-off-by: David S. Miller
11 Feb, 2019
1 commit
-
Modify the kernel users of the TCA_ACT_* macros to use TCA_ID_*. For
example, use TCA_ID_GACT instead of TCA_ACT_GACT. This will align with
TCA_ID_POLICE and also differentiates these identifier, used in struct
tc_action_ops type field, from other macros starting with TCA_ACT_.To make things clearer, we name the enum defining the TCA_ID_*
identifiers and also change the "type" field of struct tc_action to
id.Signed-off-by: Eli Cohen
Acked-by: Jiri Pirko
Signed-off-by: David S. Miller
23 Oct, 2018
1 commit
-
in the following command:
# tc action add action random
'goto chain x' is allowed only for c1: setting it for c2 makes the kernel
crash with NULL pointer dereference, since TC core doesn't initialize the
chain handle.Signed-off-by: Davide Caratti
Acked-by: Cong Wang
Acked-by: Jiri Pirko
Signed-off-by: David S. Miller
25 Sep, 2018
1 commit
-
Add additional counters that will store the bytes/packets processed by
hardware. These will be exported through the netlink interface for
displaying by the iproute2 tc toolSigned-off-by: Eelco Chaudron
Signed-off-by: David S. Miller
01 Sep, 2018
1 commit
-
This reverts commit 331a9295de23 ("net: sched: act: add extack for lookup callback").
This extack is never used after 6 months... In fact, it can be just
set in the caller, right after ->lookup().Cc: Alexander Aring
Signed-off-by: Cong Wang
Signed-off-by: David S. Miller
22 Aug, 2018
1 commit
-
All ops->delete() wants is getting the tn->idrinfo, but we already
have tc_action before calling ops->delete(), and tc_action has
a pointer ->idrinfo.More importantly, each type of action does the same thing, that is,
just calling tcf_idr_delete_index().So it can be just removed.
Fixes: b409074e6693 ("net: sched: add 'delete' function to action ops")
Cc: Jiri Pirko
Cc: Vlad Buslov
Signed-off-by: Cong Wang
Signed-off-by: David S. Miller
20 Aug, 2018
1 commit
-
Recently, ops->init() and ops->dump() of all actions were modified to
always obtain tcf_lock when accessing private action state. Actions that
don't depend on tcf_lock for synchronization with their data path use
non-bh locking API. However, tcf_lock is also used to protect rate
estimator stats in softirq context by timer callback.Change ops->init() and ops->dump() of all actions to disable bh when using
tcf_lock to prevent deadlock reported by following lockdep warning:[ 105.470398] ================================
[ 105.475014] WARNING: inconsistent lock state
[ 105.479628] 4.18.0-rc8+ #664 Not tainted
[ 105.483897] --------------------------------
[ 105.488511] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
[ 105.494871] swapper/16/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
[ 105.500449] 00000000f86c012e (&(&p->tcfa_lock)->rlock){+.?.}, at: est_fetch_counters+0x3c/0xa0
[ 105.509696] {SOFTIRQ-ON-W} state was registered at:
[ 105.514925] _raw_spin_lock+0x2c/0x40
[ 105.519022] tcf_bpf_init+0x579/0x820 [act_bpf]
[ 105.523990] tcf_action_init_1+0x4e4/0x660
[ 105.528518] tcf_action_init+0x1ce/0x2d0
[ 105.532880] tcf_exts_validate+0x1d8/0x200
[ 105.537416] fl_change+0x55a/0x268b [cls_flower]
[ 105.542469] tc_new_tfilter+0x748/0xa20
[ 105.546738] rtnetlink_rcv_msg+0x56a/0x6d0
[ 105.551268] netlink_rcv_skb+0x18d/0x200
[ 105.555628] netlink_unicast+0x2d0/0x370
[ 105.559990] netlink_sendmsg+0x3b9/0x6a0
[ 105.564349] sock_sendmsg+0x6b/0x80
[ 105.568271] ___sys_sendmsg+0x4a1/0x520
[ 105.572547] __sys_sendmsg+0xd7/0x150
[ 105.576655] do_syscall_64+0x72/0x2c0
[ 105.580757] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 105.586243] irq event stamp: 489296
[ 105.590084] hardirqs last enabled at (489296): [] _raw_spin_unlock_irq+0x29/0x40
[ 105.599765] hardirqs last disabled at (489295): [] _raw_spin_lock_irq+0x15/0x50
[ 105.609277] softirqs last enabled at (489292): [] irq_enter+0x83/0xa0
[ 105.618001] softirqs last disabled at (489293): [] irq_exit+0x140/0x190
[ 105.626813]
other info that might help us debug this:
[ 105.633976] Possible unsafe locking scenario:[ 105.640526] CPU0
[ 105.643325] ----
[ 105.646125] lock(&(&p->tcfa_lock)->rlock);
[ 105.650747]
[ 105.653717] lock(&(&p->tcfa_lock)->rlock);
[ 105.658514]
*** DEADLOCK ***[ 105.665349] 1 lock held by swapper/16/0:
[ 105.669629] #0: 00000000a640ad99 ((&est->timer)){+.-.}, at: call_timer_fn+0x10b/0x550
[ 105.678200]
stack backtrace:
[ 105.683194] CPU: 16 PID: 0 Comm: swapper/16 Not tainted 4.18.0-rc8+ #664
[ 105.690249] Hardware name: Supermicro SYS-2028TP-DECR/X10DRT-P, BIOS 2.0b 03/30/2017
[ 105.698626] Call Trace:
[ 105.701421]
[ 105.703791] dump_stack+0x92/0xeb
[ 105.707461] print_usage_bug+0x336/0x34c
[ 105.711744] mark_lock+0x7c9/0x980
[ 105.715500] ? print_shortest_lock_dependencies+0x2e0/0x2e0
[ 105.721424] ? check_usage_forwards+0x230/0x230
[ 105.726315] __lock_acquire+0x923/0x26f0
[ 105.730597] ? debug_show_all_locks+0x240/0x240
[ 105.735478] ? mark_lock+0x493/0x980
[ 105.739412] ? check_chain_key+0x140/0x1f0
[ 105.743861] ? __lock_acquire+0x836/0x26f0
[ 105.748323] ? lock_acquire+0x12e/0x290
[ 105.752516] lock_acquire+0x12e/0x290
[ 105.756539] ? est_fetch_counters+0x3c/0xa0
[ 105.761084] _raw_spin_lock+0x2c/0x40
[ 105.765099] ? est_fetch_counters+0x3c/0xa0
[ 105.769633] est_fetch_counters+0x3c/0xa0
[ 105.773995] est_timer+0x87/0x390
[ 105.777670] ? est_fetch_counters+0xa0/0xa0
[ 105.782210] ? lock_acquire+0x12e/0x290
[ 105.786410] call_timer_fn+0x161/0x550
[ 105.790512] ? est_fetch_counters+0xa0/0xa0
[ 105.795055] ? del_timer_sync+0xd0/0xd0
[ 105.799249] ? __lock_is_held+0x93/0x110
[ 105.803531] ? mark_held_locks+0x20/0xe0
[ 105.807813] ? _raw_spin_unlock_irq+0x29/0x40
[ 105.812525] ? est_fetch_counters+0xa0/0xa0
[ 105.817069] ? est_fetch_counters+0xa0/0xa0
[ 105.821610] run_timer_softirq+0x3c4/0x9f0
[ 105.826064] ? lock_acquire+0x12e/0x290
[ 105.830257] ? __bpf_trace_timer_class+0x10/0x10
[ 105.835237] ? __lock_is_held+0x25/0x110
[ 105.839517] __do_softirq+0x11d/0x7bf
[ 105.843542] irq_exit+0x140/0x190
[ 105.847208] smp_apic_timer_interrupt+0xac/0x3b0
[ 105.852182] apic_timer_interrupt+0xf/0x20
[ 105.856628]
[ 105.859081] RIP: 0010:cpuidle_enter_state+0xd8/0x4d0
[ 105.864395] Code: 46 ff 48 89 44 24 08 0f 1f 44 00 00 31 ff e8 cf ec 46 ff 80 7c 24 07 00 0f 85 1d 02 00 00 e8 9f 90 4b ff fb 66 0f 1f 44 00 00 8b 6c 24 08 4d 29 fd 0f 80 36 03 00 00 4c 89 e8 48 ba cf f7 53
[ 105.884288] RSP: 0018:ffff8803ad94fd20 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
[ 105.892494] RAX: 0000000000000000 RBX: ffffe8fb300829c0 RCX: ffffffffb41e19e1
[ 105.899988] RDX: 0000000000000007 RSI: dffffc0000000000 RDI: ffff8803ad9358ac
[ 105.907503] RBP: ffffffffb6636300 R08: 0000000000000004 R09: 0000000000000000
[ 105.914997] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004
[ 105.922487] R13: ffffffffb6636140 R14: ffffffffb66362d8 R15: 000000188d36091b
[ 105.929988] ? trace_hardirqs_on_caller+0x141/0x2d0
[ 105.935232] do_idle+0x28e/0x320
[ 105.938817] ? arch_cpu_idle_exit+0x40/0x40
[ 105.943361] ? mark_lock+0x8c1/0x980
[ 105.947295] ? _raw_spin_unlock_irqrestore+0x32/0x60
[ 105.952619] cpu_startup_entry+0xc2/0xd0
[ 105.956900] ? cpu_in_idle+0x20/0x20
[ 105.960830] ? _raw_spin_unlock_irqrestore+0x32/0x60
[ 105.966146] ? trace_hardirqs_on_caller+0x141/0x2d0
[ 105.971391] start_secondary+0x2b5/0x360
[ 105.975669] ? set_cpu_sibling_map+0x1330/0x1330
[ 105.980654] secondary_startup_64+0xa5/0xb0Taking tcf_lock in sample action with bh disabled causes lockdep to issue a
warning regarding possible irq lock inversion dependency between tcf_lock,
and psample_groups_lock that is taken when holding tcf_lock in sample init:[ 162.108959] Possible interrupt unsafe locking scenario:
[ 162.116386] CPU0 CPU1
[ 162.121277] ---- ----
[ 162.126162] lock(psample_groups_lock);
[ 162.130447] local_irq_disable();
[ 162.136772] lock(&(&p->tcfa_lock)->rlock);
[ 162.143957] lock(psample_groups_lock);
[ 162.150813]
[ 162.153808] lock(&(&p->tcfa_lock)->rlock);
[ 162.158608]
*** DEADLOCK ***In order to prevent potential lock inversion dependency between tcf_lock
and psample_groups_lock, extract call to psample_group_get() from tcf_lock
protected section in sample action init function.Fixes: 4e232818bd32 ("net: sched: act_mirred: remove dependency on rtnl lock")
Fixes: 764e9a24480f ("net: sched: act_vlan: remove dependency on rtnl lock")
Fixes: 729e01260989 ("net: sched: act_tunnel_key: remove dependency on rtnl lock")
Fixes: d77284956656 ("net: sched: act_sample: remove dependency on rtnl lock")
Fixes: e8917f437006 ("net: sched: act_gact: remove dependency on rtnl lock")
Fixes: b6a2b971c0b0 ("net: sched: act_csum: remove dependency on rtnl lock")
Fixes: 2142236b4584 ("net: sched: act_bpf: remove dependency on rtnl lock")
Signed-off-by: Vlad Buslov
Signed-off-by: David S. Miller
14 Aug, 2018
1 commit
-
Signed-off-by: Jamal Hadi Salim
Signed-off-by: David S. Miller
12 Aug, 2018
1 commit
-
Use tcf spinlock to protect gact action private state from concurrent
modification during dump and init. Remove rtnl assertion that is no longer
necessary.Signed-off-by: Vlad Buslov
Signed-off-by: David S. Miller
08 Jul, 2018
5 commits
-
Implement function that atomically checks if action exists and either takes
reference to it, or allocates idr slot for action index to prevent
concurrent allocations of actions with same index. Use EBUSY error pointer
to indicate that idr slot is reserved.Implement cleanup helper function that removes temporary error pointer from
idr. (in case of error between idr allocation and insertion of newly
created action to specified index)Refactor all action init functions to insert new action to idr using this
API.Reviewed-by: Marcelo Ricardo Leitner
Signed-off-by: Vlad Buslov
Signed-off-by: Jiri Pirko
Signed-off-by: David S. Miller -
Return from action init function with reference to action taken,
even when overwriting existing action.Action init API initializes its fourth argument (pointer to pointer to tc
action) to either existing action with same index or newly created action.
In case of existing index(and bind argument is zero), init function returns
without incrementing action reference counter. Caller of action init then
proceeds working with action, without actually holding reference to it.
This means that action could be deleted concurrently.Change action init behavior to always take reference to action before
returning successfully, in order to protect from concurrent deletion.Reviewed-by: Marcelo Ricardo Leitner
Signed-off-by: Vlad Buslov
Signed-off-by: Jiri Pirko
Signed-off-by: David S. Miller -
Extend action ops with 'delete' function. Each action type to implements
its own delete function that doesn't depend on rtnl lock.Implement delete function that is required to delete actions without
holding rtnl lock. Use action API function that atomically deletes action
only if it is still in action idr. This implementation prevents concurrent
threads from deleting same action twice.Reviewed-by: Marcelo Ricardo Leitner
Signed-off-by: Vlad Buslov
Signed-off-by: Jiri Pirko
Signed-off-by: David S. Miller -
Add additional 'rtnl_held' argument to act API init functions. It is
required to implement actions that need to release rtnl lock before loading
kernel module and reacquire if afterwards.Reviewed-by: Marcelo Ricardo Leitner
Signed-off-by: Vlad Buslov
Signed-off-by: Jiri Pirko
Signed-off-by: David S. Miller -
Change type of action reference counter to refcount_t.
Change type of action bind counter to atomic_t.
This type is used to allow decrementing bind counter without testing
for 0 result.Reviewed-by: Marcelo Ricardo Leitner
Signed-off-by: Vlad Buslov
Signed-off-by: Jiri Pirko
Signed-off-by: David S. Miller
28 Mar, 2018
1 commit
-
Synchronous pernet_operations are not allowed anymore.
All are asynchronous. So, drop the structure member.Signed-off-by: Kirill Tkhai
Signed-off-by: David S. Miller
10 Mar, 2018
1 commit
-
Signed-off-by: Roman Mashak
Signed-off-by: David S. Miller
28 Feb, 2018
1 commit
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These pernet_operations are from net/sched directory, and they call only
tc_action_net_init() and tc_action_net_exit():bpf_net_ops
connmark_net_ops
csum_net_ops
gact_net_ops
ife_net_ops
ipt_net_ops
xt_net_ops
mirred_net_ops
nat_net_ops
pedit_net_ops
police_net_ops
sample_net_ops
simp_net_ops
skbedit_net_ops
skbmod_net_ops
tunnel_key_net_ops
vlan_net_ops1)tc_action_net_init() just allocates and initializes per-net memory.
2)There should not be in-flight packets at the time of tc_action_net_exit()
call, or another pernet_operations send packets to dying net (except
netlink). So, it seems they can be marked as async.Signed-off-by: Kirill Tkhai
Signed-off-by: David S. Miller
17 Feb, 2018
4 commits
-
This patch adds extack handling for a common used TC act function
"tcf_generic_walker()" to add an extack message on failures.
The tcf_generic_walker() function can fail if get a invalid command
different than DEL and GET. The naming "action" here is wrong, the
correct naming would be command.Cc: David Ahern
Signed-off-by: Alexander Aring
Signed-off-by: David S. Miller -
This patch adds extack support for act walker callback api. This
prepares to handle extack support inside each specific act
implementation.Cc: David Ahern
Signed-off-by: Alexander Aring
Signed-off-by: David S. Miller -
This patch adds extack support for act lookup callback api. This
prepares to handle extack support inside each specific act
implementation.Cc: David Ahern
Signed-off-by: Alexander Aring
Signed-off-by: David S. Miller -
This patch adds extack support for act init callback api. This
prepares to handle extack support inside each specific act
implementation.Based on work by David Ahern
Cc: David Ahern
Signed-off-by: Alexander Aring
Signed-off-by: David S. Miller
09 Jan, 2018
1 commit
03 Jan, 2018
1 commit
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We need to update lastuse to to the most updated value between what
is already set and the new value.
If HW matching fails, i.e. because of an issue, the stats are not updated
but it could be that software did match and updated lastuse.Fixes: 5712bf9c5c30 ("net/sched: act_mirred: Use passed lastuse argument")
Fixes: 9fea47d93bcc ("net/sched: act_gact: Update statistics when offloaded to hardware")
Signed-off-by: Roi Dayan
Reviewed-by: Paul Blakey
Acked-by: Jiri Pirko
Signed-off-by: David S. Miller
14 Dec, 2017
1 commit
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Since we now hold RTNL lock in tc_action_net_exit(), it is good to
batch them to speedup tc action dismantle.Cc: Jamal Hadi Salim
Cc: Jiri Pirko
Signed-off-by: Cong Wang
Signed-off-by: David S. Miller
09 Nov, 2017
1 commit
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This reverts commit ceffcc5e254b450e6159f173e4538215cebf1b59.
If we hold that refcnt, the netns can never be destroyed until
all actions are destroyed by user, this breaks our netns design
which we expect all actions are destroyed when we destroy the
whole netns.Cc: Lucas Bates
Cc: Jamal Hadi Salim
Cc: Jiri Pirko
Signed-off-by: Cong Wang
Signed-off-by: David S. Miller
03 Nov, 2017
1 commit
-
TC actions have been destroyed asynchronously for a long time,
previously in a RCU callback and now in a workqueue. If we
don't hold a refcnt for its netns, we could use the per netns
data structure, struct tcf_idrinfo, after it has been freed by
netns workqueue.Hold refcnt to ensure netns destroy happens after all actions
are gone.Fixes: ddf97ccdd7cb ("net_sched: add network namespace support for tc actions")
Reported-by: Lucas Bates
Tested-by: Lucas Bates
Cc: Jamal Hadi Salim
Cc: Jiri Pirko
Signed-off-by: Cong Wang
Signed-off-by: David S. Miller
31 Aug, 2017
1 commit
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Typically, each TC filter has its own action. All the actions of the
same type are saved in its hash table. But the hash buckets are too
small that it degrades to a list. And the performance is greatly
affected. For example, it takes about 0m11.914s to insert 64K rules.
If we convert the hash table to IDR, it only takes about 0m1.500s.
The improvement is huge.But please note that the test result is based on previous patch that
cls_flower uses IDR.Signed-off-by: Chris Mi
Signed-off-by: Jiri Pirko
Acked-by: Jamal Hadi Salim
Signed-off-by: David S. Miller
14 Apr, 2017
1 commit
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Pass the new extended ACK reporting struct to all of the generic
netlink parsing functions. For now, pass NULL in almost all callers
(except for some in the core.)Signed-off-by: Johannes Berg
Signed-off-by: David S. Miller