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linux/net/sched
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Vlad Buslov 9994677c96 net: sched: flower: fix filter net reference counting 
Fix net reference counting in fl_change() and remove redundant call to
tcf_exts_get_net() from __fl_delete(). __fl_put() already tries to get net
before releasing exts and deallocating a filter, so this code caused flower
classifier to obtain net twice per filter that is being deleted.

Implementation of __fl_delete() called tcf_exts_get_net() to pass its
result as 'async' flag to fl_mask_put(). However, 'async' flag is redundant
and only complicates fl_mask_put() implementation. This functionality seems
to be copied from filter cleanup code, where it was added by Cong with
following explanation:

    This patchset tries to fix the race between call_rcu() and
    cleanup_net() again. Without holding the netns refcnt the
    tc_action_net_exit() in netns workqueue could be called before
    filter destroy works in tc filter workqueue. This patchset
    moves the netns refcnt from tc actions to tcf_exts, without
    breaking per-netns tc actions.

This doesn't apply to flower mask, which doesn't call any tc action code
during cleanup. Simplify fl_mask_put() by removing the flag parameter and
always use tcf_queue_work() to free mask objects.

Fixes: 061775583e ("net: sched: flower: introduce reference counting for filters")
Fixes: 1f17f7742e ("net: sched: flower: insert filter to ht before offloading it to hw")
Fixes: 05cd271fd6 ("cls_flower: Support multiple masks per priority")
Reported-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2019-04-11 21:32:27 -07:00
..
Kconfig net: sched: Kconfig: update reference link for PIE 2019-03-26 11:17:09 -07:00
Makefile tc: Add support for configuring the taprio scheduler 2018-10-04 13:52:23 -07:00
act_api.c net/sched: let actions use RCU to access 'goto_chain' 2019-03-21 13:26:42 -07:00
act_bpf.c net/sched: act_bpf: validate the control action inside init() 2019-03-21 13:26:41 -07:00
act_connmark.c net/sched: act_connmark: validate the control action inside init() 2019-03-21 13:26:41 -07:00
act_csum.c net/sched: act_csum: validate the control action inside init() 2019-03-21 13:26:41 -07:00
act_gact.c net/sched: act_gact: validate the control action inside init() 2019-03-21 13:26:41 -07:00
act_ife.c net/sched: act_ife: validate the control action inside init() 2019-03-21 13:26:41 -07:00
act_ipt.c net/sched: prepare TC actions to properly validate the control action 2019-03-21 13:26:41 -07:00
act_meta_mark.c net: remove duplicate includes 2017-12-13 13:18:46 -05:00
act_meta_skbprio.c net sched actions: change IFE modules alias names 2017-10-12 22:13:20 -07:00
act_meta_skbtcindex.c net: remove duplicate includes 2017-12-13 13:18:46 -05:00
act_mirred.c net: sched: fix cleanup NULL pointer exception in act_mirr 2019-03-23 21:36:04 -04:00
act_nat.c net/sched: act_nat: validate the control action inside init() 2019-03-21 13:26:41 -07:00
act_pedit.c net/sched: act_pedit: validate the control action inside init() 2019-03-21 13:26:41 -07:00
act_police.c net/sched: act_police: validate the control action inside init() 2019-03-21 13:26:41 -07:00
act_sample.c net/sched: act_sample: fix divide by zero in the traffic path 2019-04-04 10:46:33 -07:00
act_simple.c net/sched: act_simple: validate the control action inside init() 2019-03-21 13:26:41 -07:00
act_skbedit.c net/sched: act_skbedit: validate the control action inside init() 2019-03-21 13:26:41 -07:00
act_skbmod.c net/sched: act_skbmod: validate the control action inside init() 2019-03-21 13:26:42 -07:00
act_tunnel_key.c net/sched: act_tunnel_key: validate the control action inside init() 2019-03-21 13:26:42 -07:00
act_vlan.c net/sched: act_vlan: validate the control action inside init() 2019-03-21 13:26:42 -07:00
cls_api.c net: sched: don't set tunnel for decap action 2019-04-02 13:20:30 -07:00
cls_basic.c net_sched: initialize net pointer inside tcf_exts_init() 2019-02-22 15:26:51 -08:00
cls_bpf.c net_sched: initialize net pointer inside tcf_exts_init() 2019-02-22 15:26:51 -08:00
cls_cgroup.c net_sched: initialize net pointer inside tcf_exts_init() 2019-02-22 15:26:51 -08:00
cls_flow.c net_sched: initialize net pointer inside tcf_exts_init() 2019-02-22 15:26:51 -08:00
cls_flower.c net: sched: flower: fix filter net reference counting 2019-04-11 21:32:27 -07:00
cls_fw.c Revert "net: sched: fw: don't set arg->stop in fw_walk() when empty" 2019-02-27 10:12:19 -08:00
cls_matchall.c net/sched: fix ->get helper of the matchall cls 2019-04-01 14:13:25 -07:00
cls_route.c net_sched: initialize net pointer inside tcf_exts_init() 2019-02-22 15:26:51 -08:00
cls_rsvp.c
…
cls_rsvp.h net_sched: initialize net pointer inside tcf_exts_init() 2019-02-22 15:26:51 -08:00
cls_rsvp6.c
…
cls_tcindex.c net_sched: initialize net pointer inside tcf_exts_init() 2019-02-22 15:26:51 -08:00
cls_u32.c net_sched: initialize net pointer inside tcf_exts_init() 2019-02-22 15:26:51 -08:00
em_canid.c
…
em_cmp.c
…
em_ipset.c netfilter: x_tables: move hook state into xt_action_param structure 2016-11-03 10:56:21 +01:00
em_ipt.c net: sched: add em_ipt ematch for calling xtables matches 2018-02-21 13:15:33 -05:00
em_meta.c net: convert sock.sk_refcnt from atomic_t to refcount_t 2017-07-01 07:39:08 -07:00
em_nbyte.c net: sched: em_nbyte: don't add the data offset twice 2018-01-24 14:52:40 -05:00
em_text.c
…
em_u32.c
…
ematch.c net: sched: ematch: obtain net pointer from blocks 2017-10-16 21:00:40 +01:00
sch_api.c net: sched: when clearing NOLOCK, clear TCQ_F_CPUSTATS, too 2019-04-10 12:20:46 -07:00
sch_atm.c net: sched: rename qdisc_destroy() to qdisc_put() 2018-09-25 20:17:35 -07:00
sch_blackhole.c net_sched: blackhole: tell upper qdisc about dropped packets 2018-06-17 08:42:33 +09:00
sch_cake.c sch_cake: Make sure we can write the IP header before changing DSCP bits 2019-04-04 10:55:59 -07:00
sch_cbq.c net: sched: introduce and use qdisc tree flush/purge helpers 2019-04-01 14:50:13 -07:00
sch_cbs.c net/sched: cbs: fix port_rate miscalculation 2019-04-10 19:27:43 -07:00
sch_choke.c net: sched: sch: add extack for change qdisc ops 2017-12-21 12:32:50 -05:00
sch_codel.c net: sched: sch: add extack for change qdisc ops 2017-12-21 12:32:50 -05:00
sch_drr.c net: sched: introduce and use qdisc tree flush/purge helpers 2019-04-01 14:50:13 -07:00
sch_dsmark.c sched: Avoid dereferencing skb pointer after child enqueue 2019-01-15 20:12:00 -08:00
sch_etf.c etf: Drop all expired packets 2018-11-16 20:39:34 -08:00
sch_fifo.c net: sched: rename qdisc_destroy() to qdisc_put() 2018-09-25 20:17:35 -07:00
sch_fq.c net_sched: sch_fq: avoid calling ktime_get_ns() if not needed 2018-11-20 09:51:32 -08:00
sch_fq_codel.c net: Add and use skb_mark_not_on_list(). 2018-09-10 10:06:54 -07:00
sch_generic.c Revert: "net: sched: put back q.qlen into a single location" 2019-04-10 12:20:46 -07:00
sch_gred.c net: sched: gred: support reporting stats from offloads 2018-11-19 18:53:46 -08:00
sch_hfsc.c net: sched: introduce and use qdisc tree flush/purge helpers 2019-04-01 14:50:13 -07:00
sch_hhf.c net: Add and use skb_mark_not_on_list(). 2018-09-10 10:06:54 -07:00
sch_htb.c net: sched: introduce and use qdisc tree flush/purge helpers 2019-04-01 14:50:13 -07:00
sch_ingress.c net: sched: allow ingress and clsact qdiscs to share filter blocks 2018-01-17 14:53:57 -05:00
sch_mq.c net: sched: introduce and use qstats read helpers 2019-04-01 14:50:13 -07:00
sch_mqprio.c net: sched: introduce and use qstats read helpers 2019-04-01 14:50:13 -07:00
sch_multiq.c net: sched: introduce and use qdisc tree flush/purge helpers 2019-04-01 14:50:13 -07:00
sch_netem.c net: netem: fix skb length BUG_ON in __skb_to_sgvec 2019-02-28 10:31:31 -08:00
sch_pie.c net: sched: pie: avoid slow division in drop probability decay 2019-02-28 10:35:41 -08:00
sch_plug.c net: sched: sch: add extack for change qdisc ops 2017-12-21 12:32:50 -05:00
sch_prio.c net: sched: introduce and use qdisc tree flush/purge helpers 2019-04-01 14:50:13 -07:00
sch_qfq.c net: sched: introduce and use qdisc tree flush/purge helpers 2019-04-01 14:50:13 -07:00
sch_red.c net: sched: introduce and use qdisc tree flush/purge helpers 2019-04-01 14:50:13 -07:00
sch_sfb.c net: sched: introduce and use qdisc tree flush/purge helpers 2019-04-01 14:50:13 -07:00
sch_sfq.c net: sch: api: add extack support in tcf_block_get 2017-12-21 12:32:51 -05:00
sch_skbprio.c net/sched: add skbprio scheduler 2018-07-24 14:44:00 -07:00
sch_taprio.c net/sched: taprio: fix picos_per_byte miscalculation 2019-04-10 19:27:43 -07:00
sch_tbf.c net: sched: introduce and use qdisc tree flush/purge helpers 2019-04-01 14:50:13 -07:00
sch_teql.c net: sched: sch: add extack for init callback 2017-12-21 12:32:50 -05:00