NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | SEE ALSO | COLOPHON
Cgroup classifier in tc(8) Linux Cgroup classifier in tc(8)
cgroup - control group based traffic control filter
tc filter ... cgroup [ match EMATCH_TREE ] [ action ACTION_SPEC ]
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.
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.
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.
tc(8), tc-ematch(8), the file Documentation/cgroups/net_cls.txt of the Linux kernel tree
This page is part of the iproute2 (utilities for controlling TCP/IP networking and traffic) project. Information about the project can be found at ⟨http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2⟩. If you have a bug report for this manual page, send it to email@example.com, firstname.lastname@example.org. This page was obtained from the project's upstream Git repository ⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on 2022-12-17. (At that time, the date of the most recent commit that was found in the repository was 2022-12-14.) If you discover any rendering problems in this HTML version of the page, or you believe there is a better or more up-to-date source for the page, or you have corrections or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to email@example.com iproute2 21 Oct 2015 Cgroup classifier in tc(8)
Pages that refer to this page: tc(8)