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the following script:
# tc qdisc add dev crash0 clsact
# tc filter add dev crash0 egress matchall \
> action police rate 3mbit burst 250k pass index 90
# tc actions replace action police \
> rate 3mbit burst 250k goto chain 42 index 90 cookie c1a0c1a0
# tc actions show action police rate 3mbit burst
had the following output:
Error: Failed to init TC action chain.
We have an error talking to the kernel
total acts 1
action order 0: police 0x5a rate 3Mbit burst 250Kb mtu 2Kb action goto chain 42 overhead 0b
ref 2 bind 1
cookie c1a0c1a0
Then, when crash0 starts transmitting more than 3Mbit/s, the following
kernel crash is observed:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
#PF error: [normal kernel read fault]
PGD 800000007a779067 P4D 800000007a779067 PUD 2ad96067 PMD 0
Oops: 0000 [#1] SMP PTI
CPU: 3 PID: 5032 Comm: netperf 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 <48> 8b 12 48 89 55 00 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f c3
RSP: 0018:ffffb0e04064fa60 EFLAGS: 00010246
RAX: 000000002000002a RBX: ffff93bb3322cce0 RCX: 0000000000000005
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff93bb3322cce0
RBP: ffffb0e04064fb00 R08: 0000000000000022 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff93bb3beed300
R13: ffff93bb3beed308 R14: 0000000000000001 R15: ffff93bb3b64d000
FS: 00007f0bc6be5740(0000) GS:ffff93bb3db80000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000746a8001 CR4: 00000000001606e0
Call Trace:
tcf_classify+0x58/0x120
__dev_queue_xmit+0x40a/0x890
? ipt_do_table+0x31c/0x420 [ip_tables]
? ip_finish_output2+0x16f/0x430
ip_finish_output2+0x16f/0x430
? ip_output+0x69/0xe0
ip_output+0x69/0xe0
? ip_forward_options+0x1a0/0x1a0
__tcp_transmit_skb+0x563/0xa40
tcp_write_xmit+0x243/0xfa0
__tcp_push_pending_frames+0x32/0xf0
tcp_sendmsg_locked+0x404/0xd30
tcp_sendmsg+0x27/0x40
sock_sendmsg+0x36/0x40
__sys_sendto+0x10e/0x140
? __sys_connect+0x87/0xf0
? syscall_trace_enter+0x1df/0x2e0
? __audit_syscall_exit+0x216/0x260
__x64_sys_sendto+0x24/0x30
do_syscall_64+0x5b/0x180
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f0bc5ffbafd
Code: 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 8b 05 ae c4 2c 00 85 c0 75 2d 45 31 c9 45 31 c0 4c 63 d1 48 63 ff b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 63 63 2c 00 f7 d8 64 89 02 48
RSP: 002b:00007fffef94b7f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000004000 RCX: 00007f0bc5ffbafd
RDX: 0000000000004000 RSI: 00000000017e5420 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00000000017e51d0 R14: 0000000000000010 R15: 0000000000000006
Modules linked in: act_police veth ip6table_filter ip6_tables iptable_filter binfmt_misc ext4 snd_hda_codec_generic mbcache crct10dif_pclmul jbd2 crc32_pclmul ghash_clmulni_intel snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core snd_seq snd_seq_device snd_pcm aesni_intel crypto_simd cryptd glue_helper snd_timer snd joydev pcspkr virtio_balloon soundcore i2c_piix4 nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs ata_generic pata_acpi qxl drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm virtio_blk virtio_net virtio_console net_failover failover crc32c_intel ata_piix libata serio_raw virtio_pci virtio_ring virtio floppy dm_mirror dm_region_hash dm_log dm_mod
CR2: 0000000000000000
Validating the control action within tcf_police_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 <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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add test to verify if act_police forbids 'goto chain' control actions for
'exceed' traffic.
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Only the police action allows us to specify an arbitrary numeric value
for the control action. This change introduces an explicit test case
for the above feature and then leverage it for testing the kernel behavior
for invalid control actions (reject).
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Roman Mashak <mrv@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Added extra test cases for control actions (reclassify, pipe etc.),
cookies, max index value and police args sanity check.
Signed-off-by: Roman Mashak <mrv@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Add basic unit tests for police and skbmod actions in tc.
Signed-off-by: Lucas Bates <lucasb@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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