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actions in tc(8) Linux actions in tc(8)
NAME
actions - independently defined actions in tc
SYNOPSIS
tc [ TC_OPTIONS ] actions add | change | replace ACTSPEC
tc [ TC_OPTIONS ] actions get | delete ACTISPEC
tc [ TC_OPTIONS ] actions flush ACTNAMESPEC
tc [ TC_OPTIONS ] actions ls | list ACTNAMESPEC [ ACTFILTER ]
ACTSPEC := action ACTDETAIL [ INDEXSPEC ] [ COOKIESPEC ] [ FLAGS ] [ HWSTATSSPEC ]
[ CONTROL ]
ACTISPEC := ACTNAMESPEC INDEXSPEC
ACTNAMESPEC := action ACTNAME
INDEXSPEC := index INDEX
ACTFILTER := since MSTIME
COOKIESPEC := cookie COOKIE
FLAGS := no_percpu
HWSTATSSPEC := hw_stats { immediate | delayed | disabled }
ACTDETAIL := ACTNAME ACTPARAMS
ACTNAME may be any valid action type: gact, mirred, bpf, connmark, csum, police,
etc.
MSTIME Time since last update.
CONTROL := { reclassify | pipe | drop | continue | ok }
TC_OPTIONS These are the options that are specific to tc and not only the options.
Refer to tc(8) for more information.
DESCRIPTION
The actions object in tc allows a user to define actions independently of a classifier
(filter). These actions can then be assigned to one or more filters, with any packets
matching the classifier's criteria having that action performed on them.
Each action type (mirred, police, etc.) will have its own table to store all created ac-
tions.
OPERATIONS
add Create a new action in that action's table.
change
replace
Make modifications to an existing action.
get Display the action with the specified index value. When combined with the -s option
for tc, display the statistics for that action.
delete Delete the action with the specified index value. If the action is already associ-
ated with a classifier, it does not delete the classifier.
ls
list List all the actions in the specified table. When combined with the -s option for
tc, display the statistics for all actions in the specified table. When combined
with the option since allows doing a millisecond time-filter since the last time an
action was used in the datapath.
flush Delete all actions stored in the specified table.
ACTION OPTIONS
Note that these options are available to all action types.
index INDEX
Specify the table index value of an action. INDEX is a 32-bit value that is unique
to the specific type of action referenced.
For add, change, and replace operations, the index is optional. When adding a new
action, specifying an index value will assign the action to that index unless that
index value has already been assigned. Omitting the index value for an add opera-
tion will cause the kernel to assign a value to the new action.
For get and delete operations, the index is required to identify the specific ac-
tion to be displayed or deleted.
cookie COOKIE
In addition to the specific action, mark the matching packet with the value speci-
fied by COOKIE. The COOKIE is a 128-bit value that will not be interpreted by the
kernel whatsoever. As such, it can be used as a correlating value for maintaining
user state. The value to be stored is completely arbitrary and does not require a
specific format. It is stored inside the action structure itself.
FLAGS Action-specific flags. Currently, the only supported flag is no_percpu which indi-
cates that action is expected to have minimal software data-path traffic and
doesn't need to allocate stat counters with percpu allocator. This option is in-
tended to be used by hardware-offloaded actions.
hw_stats HW_STATS
Specifies the type of HW stats of new action. If omitted, any stats counter type is
going to be used, according to driver and its resources. The HW_STATS indicates
the type. Any of the following are valid:
immediate
Means that in dump, user gets the current HW stats state from the device
queried at the dump time.
delayed
Means that in dump, user gets HW stats that might be out of date for some
time, maybe couple of seconds. This is the case when driver polls stats up-
dates periodically or when it gets async stats update from the device.
disabled
No HW stats are going to be available in dump.
since MSTIME
When dumping large number of actions, a millisecond time-filter can be specified
MSTIME. The MSTIME is a millisecond count since last time a packet hit the action.
As an example specifying "since 20000" implies to dump all actions that have seen
packets in the last 20 seconds. This option is useful when the kernel has a large
number of actions and you are only interested in recently used actions.
CONTROL
The CONTROL indicates how tc should proceed after executing the action. Any of the
following are valid:
reclassify
Restart the classifiction by jumping back to the first filter attached to
the action's parent.
pipe Continue with the next action. This is the default control.
drop Drop the packed without running any further actions.
continue
Continue the classification with the next filter.
pass Return to the calling qdisc for packet processing, and end classification of
this packet.
SEE ALSO
tc(8), tc-bpf(8), tc-connmark(8), tc-csum(8), tc-ife(8), tc-mirred(8), tc-nat(8), tc-
pedit(8), tc-police(8), tc-simple(8), tc-skbedit(8), tc-skbmod(8), tc-tunnel_key(8), tc-
vlan(8), tc-xt(8)
iproute2 1 Aug 2017 actions in tc(8)
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On Apache
Under GNU General Public License
2025-04-02 02:58 @18.223.211.185 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)