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Cgroup classifier in tc(8)           Linux          Cgroup classifier in tc(8)



NAME
       cgroup - control group based traffic control filter

SYNOPSIS
       tc filter ... cgroup [ match EMATCH_TREE ] [ action ACTION_SPEC ]

DESCRIPTION
       This  filter  serves as a hint to tc that the assigned class ID of the net_cls con-
       trol group the process the packet originates from belongs to  should  be  used  for
       classification. Obviously, it is useful for locally generated packets only.

OPTIONS
       action ACTION_SPEC
              Apply an action from the generic actions framework on matching packets.

       match EMATCH_TREE
              Match  packets using the extended match infrastructure. See tc-ematch(8) for
              a detailed description of the allowed syntax in EMATCH_TREE.

EXAMPLES
       In order to use this filter, a net_cls control group has to be  created  first  and
       class  as  well  as  process  ID(s) assigned to it. The following creates a net_cls
       cgroup named "foobar":

              modprobe cls_cgroup mkdir /sys/fs/cgroup/net_cls mount -t  cgroup  -onet_cls
              net_cls /sys/fs/cgroup/net_cls mkdir /sys/fs/cgroup/net_cls/foobar

       To  assign a class ID to the created cgroup, a file named net_cls.classid has to be
       created which contains the class ID to be assigned as  a  hexadecimal,  64bit  wide
       number.  The upper 32bits are reserved for the major handle, the remaining hold the
       minor. So a class ID of e.g.  ff:be has to be written like  so:  0xff00be  (leading
       zeroes  may be omitted). To continue the above example, the following assigns class
       ID 1:2 to foobar cgroup:

              echo 0x10002 > /sys/fs/cgroup/net_cls/foobar/net_cls.classid

       Finally some PIDs can be assigned to the given cgroup:

              echo   1234    >    /sys/fs/cgroup/net_cls/foobar/tasks    echo    5678    >
              /sys/fs/cgroup/net_cls/foobar/tasks

       Now by simply attaching a cgroup filter to a qdisc makes packets from PIDs 1234 and
       5678 be pushed into class 1:2.


SEE ALSO
       tc(8), tc-ematch(8),
       the file Documentation/cgroups/net_cls.txt of the Linux kernel tree



iproute2                          21 Oct 2015       Cgroup classifier in tc(8)

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