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81 lines
2.0 KiB
Groff
81 lines
2.0 KiB
Groff
.TH "Cgroup classifier in tc" 8 " 21 Oct 2015" "iproute2" "Linux"
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.SH NAME
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cgroup \- control group based traffic control filter
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.SH SYNOPSIS
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.in +8
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.ti -8
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.BR tc " " filter " ... " cgroup " [ " match
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.IR EMATCH_TREE " ] [ "
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.B action
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.IR ACTION_SPEC " ]"
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.SH DESCRIPTION
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This filter serves as a hint to
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.B tc
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that the assigned class ID of the net_cls control group the process the packet
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originates from belongs to should be used for classification. Obviously, it is
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useful for locally generated packets only.
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.SH OPTIONS
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.TP
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.BI action " ACTION_SPEC"
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Apply an action from the generic actions framework on matching packets.
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.TP
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.BI match " EMATCH_TREE"
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Match packets using the extended match infrastructure. See
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.BR tc-ematch (8)
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for a detailed description of the allowed syntax in
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.IR EMATCH_TREE .
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.SH EXAMPLES
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In order to use this filter, a net_cls control group has to be created first and
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class as well as process ID(s) assigned to it. The following creates a net_cls
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cgroup named "foobar":
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.RS
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.EX
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modprobe cls_cgroup
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mkdir /sys/fs/cgroup/net_cls
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mount -t cgroup -onet_cls net_cls /sys/fs/cgroup/net_cls
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mkdir /sys/fs/cgroup/net_cls/foobar
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.EE
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.RE
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To assign a class ID to the created cgroup, a file named
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.I net_cls.classid
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has to be created which contains the class ID to be assigned as a hexadecimal,
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64bit wide number. The upper 32bits are reserved for the major handle, the
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remaining hold the minor. So a class ID of e.g.
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.B ff:be
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has to be written like so:
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.B 0xff00be
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(leading zeroes may be omitted). To continue the above example, the following
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assigns class ID 1:2 to foobar cgroup:
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.RS
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.EX
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echo 0x10002 > /sys/fs/cgroup/net_cls/foobar/net_cls.classid
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.EE
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.RE
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Finally some PIDs can be assigned to the given cgroup:
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.RS
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.EX
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echo 1234 > /sys/fs/cgroup/net_cls/foobar/tasks
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echo 5678 > /sys/fs/cgroup/net_cls/foobar/tasks
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.EE
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.RE
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Now by simply attaching a
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.B cgroup
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filter to a
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.B qdisc
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makes packets from PIDs 1234 and 5678 be pushed into class 1:2.
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.SH SEE ALSO
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.BR tc (8),
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.BR tc-ematch (8),
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.br
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the file
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.I Documentation/cgroups/net_cls.txt
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of the Linux kernel tree
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