On Wed, Jul 12, 2017 at 10:08 AM, 张军伟(基础平台部) <zhangjunweimar...@didichuxing.com> wrote: > about skb->sk > it is used as supplementary when skb->dev is empty，such as netlink message。 > > + if (skb->dev) > + net = dev_net(skb->dev); > + else if (skb->sk) > + net = sock_net(skb->sk); > + else > + return;
Check udp_set_dev_scratch(). Again, as Neil mentioned, the idea is arguable, it is actually harder to trace skb's with your patch when they across netns'es.
