40 lines
1.2 KiB
Plaintext
40 lines
1.2 KiB
Plaintext
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
|