netdev - Re: [PATCH 16/33] netns ct: per-netns event cache

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Date:	Tue, 09 Sep 2008 08:12:27 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Alexey Dobriyan <adobriyan@...il.com>
CC:	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	containers@...ts.linux-foundation.org
Subject: Re: [PATCH 16/33] netns ct: per-netns event cache

Alexey Dobriyan wrote:
> Heh, last minute proof-reading of this patch made me think,
> that this is actually unneeded, simply because "ct" pointers will be
> different for different conntracks in different netns, just like they
> are different in one netns.
> 
> Not so sure anymore.

Its necessary because the cache needs to be flushed on netns exit
and this is only allowed while its not in use anymore.

I don't see anything in this series actually making sure nothing
hits the cache on exit though. Am I missing something?

Additionally (I might have missed a following patch moving it
out though) this doesn't belong in the netns exit path:

void nf_conntrack_cleanup(struct net *net)
{
	rcu_assign_pointer(ip_ct_attach, NULL);
...
	rcu_assign_pointer(nf_ct_destroy, NULL);
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