netfilter: nf_queue: only call synchronize_net twice if nf_queue is active

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nf_unregister_net_hook(s) can avoid a second call to synchronize_net,
provided there is no nfqueue active in that net namespace (which is
the common case).

This also gets rid of the extra arg to nf_queue_nf_hook_drop(), normally
this gets called during netns cleanup so no packets should be queued.

For the rare case of base chain being unregistered or module removal
while nfqueue is in use the extra hiccup due to the packet drops isn't
a big deal.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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Florian Westphal 2017-04-24 15:37:41 +02:00 • committed by Pablo Neira Ayuso

parent c83fa19603

commit 039b40ee58

5 changed files with 27 additions and 24 deletions

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include/net/netfilter/nf_queue.h

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