Read from text file;format and print output Post: 302784307

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tc-cgroup

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 control 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 follow-
       ing 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)