ping...
On 2013/12/9 10:32, Libo Chen wrote:
> hello network hackers,
>
> A linux container was builded with veth pair(veth0 inside container,
> veth1 outside container),
>
> the config as below:
>
> lxc.network.type = veth
> lxc.network.flags = up
> lxc.network.link = br0 // base on eth0
> lxc.network.name = eth0
> lxc.network.ipv4 = 128.5.130.26/24
>
> then I use tc command with cgroup filter on veth0, it works well. But when
> setting on eth0, it doesn`t work.
>
> The reason is dev_forward_skb() in veth_xmit will call skb_scrub_packet and
> clean all information including skb->sk
> in the skb, so if cls_cgroup_classify is working in serving softirq state, it
> will return failer, see below:
>
> if (in_serving_softirq()) {
> /* If there is an sk_classid we'll use that. */
> if (!skb->sk)
> return -1;
> classid = skb->sk->sk_classid;
> }
>
>
> Qdisc with cgroup filter on physics interface can not control a container
> network, it is disappointed.
>
> we can save sk_classid before skb_scrub_packet and restore it after that. Is
> it reasonable? or any way to achieve this?
>
> thanks,
> Libo
>
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