Hello!

> You're right.  That makes it safe with preemption.  However, netfilter
> could still queue the packet which means the neigh entry and dev can
> go away under it, right?

Netfilter is very clean about this. Each hook gets two devices as _arguments_
(input and output, skb->dev is one of them depending on context), nf_queue
grabs the references, nf_reinjects puts them.

Alexey
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