linux-kernel - Re: [PATCH] netfilter: add per-namespace logging to nfnetlink

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Message-ID: <20110718203249.GC2489@p183.telecom.by>
Date:	Mon, 18 Jul 2011 23:32:49 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	rweikusat@...ileactivedefense.com, kaber@...sh.net,
	netfilter-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netfilter: add per-namespace logging to nfnetlink_log.c

On Mon, Jul 18, 2011 at 01:19:43PM -0700, David Miller wrote:
> From: Rainer Weikusat <rweikusat@...ileactivedefense.com>
> Date: Mon, 18 Jul 2011 21:17:00 +0100
> 
> > David Miller <davem@...emloft.net> writes:
> >> We're also specifically talking about namespace stuff, so you should have
> >> at least refined your match criteria just a little bit.
> > 
> > The person I was replying to wrote 'We did whole networking without
> > sprinkling ifdefs'.
> 
> He was talking specifically about namespace stuff.

Indeed.

Rainer, while your desire to keep CONFIG_NET_NS=n case equivalent
to current code is understandable and kernel people share it at large,
what you're fighting for is maybe one dereference on speed-uncritical
code paths and one pointer in small amount of data structures.
As such having common executable code matters more.

netns will be stubbed to &init_net at several places.
See how e. g. xt_hashlimit is done.
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