From 6255c46fa03798cbd8addd98929aff7eef86ae02 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Mon, 11 Jan 2016 23:10:44 -0500 Subject: cgroup: rename cgroup documentations cgroup-legacy may be too loaded. Rename the docs so that they're postfixed with v1 and v2. * s/cgroup-legacy/cgroup-v1/ * s/cgroup.txt/cgroup-v2.txt/ Signed-off-by: Tejun Heo --- Documentation/cgroup-v1/net_cls.txt | 39 +++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 Documentation/cgroup-v1/net_cls.txt (limited to 'Documentation/cgroup-v1/net_cls.txt') diff --git a/Documentation/cgroup-v1/net_cls.txt b/Documentation/cgroup-v1/net_cls.txt new file mode 100644 index 000000000000..ec182346dea2 --- /dev/null +++ b/Documentation/cgroup-v1/net_cls.txt @@ -0,0 +1,39 @@ +Network classifier cgroup +------------------------- + +The Network classifier cgroup provides an interface to +tag network packets with a class identifier (classid). + +The Traffic Controller (tc) can be used to assign +different priorities to packets from different cgroups. +Also, Netfilter (iptables) can use this tag to perform +actions on such packets. + +Creating a net_cls cgroups instance creates a net_cls.classid file. +This net_cls.classid value is initialized to 0. + +You can write hexadecimal values to net_cls.classid; the format for these +values is 0xAAAABBBB; AAAA is the major handle number and BBBB +is the minor handle number. +Reading net_cls.classid yields a decimal result. + +Example: +mkdir /sys/fs/cgroup/net_cls +mount -t cgroup -onet_cls net_cls /sys/fs/cgroup/net_cls +mkdir /sys/fs/cgroup/net_cls/0 +echo 0x100001 > /sys/fs/cgroup/net_cls/0/net_cls.classid + - setting a 10:1 handle. + +cat /sys/fs/cgroup/net_cls/0/net_cls.classid +1048577 + +configuring tc: +tc qdisc add dev eth0 root handle 10: htb + +tc class add dev eth0 parent 10: classid 10:1 htb rate 40mbit + - creating traffic class 10:1 + +tc filter add dev eth0 parent 10: protocol ip prio 10 handle 1: cgroup + +configuring iptables, basic example: +iptables -A OUTPUT -m cgroup ! --cgroup 0x100001 -j DROP -- cgit v1.2.3