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 ] [ SKIPSPEC ]

	       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 }

	       SKIPSPEC := { skip_sw | skip_hw }

	       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 actions.


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 associated 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 operation
	      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 action to be displayed or deleted.


       cookie COOKIE
	      In addition to the specific action, mark the matching packet
	      with the value specified 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 indicates 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 intended 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 updates 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.


       SKIPSPEC
	      The SKIPSPEC indicates how tc should proceed when executing the
	      action. Any of the following are valid:

	      skip_sw
		     Do not process action by software. If hardware has no
		     offload support for this action, operation will fail.

	      skip_hw
		     Do not process action by hardware.


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)