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44 lines
1.3 KiB
44 lines
1.3 KiB
========================= |
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Network classifier cgroup |
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========================= |
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The Network classifier cgroup provides an interface to |
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tag network packets with a class identifier (classid). |
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The Traffic Controller (tc) can be used to assign |
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different priorities to packets from different cgroups. |
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Also, Netfilter (iptables) can use this tag to perform |
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actions on such packets. |
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Creating a net_cls cgroups instance creates a net_cls.classid file. |
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This net_cls.classid value is initialized to 0. |
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You can write hexadecimal values to net_cls.classid; the format for these |
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values is 0xAAAABBBB; AAAA is the major handle number and BBBB |
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is the minor handle number. |
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Reading net_cls.classid yields a decimal result. |
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Example:: |
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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/0 |
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echo 0x100001 > /sys/fs/cgroup/net_cls/0/net_cls.classid |
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- setting a 10:1 handle:: |
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cat /sys/fs/cgroup/net_cls/0/net_cls.classid |
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1048577 |
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- configuring tc:: |
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tc qdisc add dev eth0 root handle 10: htb |
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tc class add dev eth0 parent 10: classid 10:1 htb rate 40mbit |
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- creating traffic class 10:1:: |
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tc filter add dev eth0 parent 10: protocol ip prio 10 handle 1: cgroup |
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configuring iptables, basic example:: |
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iptables -A OUTPUT -m cgroup ! --cgroup 0x100001 -j DROP
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