linux-kernel - Re: [PATCH nf-next] netfilter: allow logging from non-init namespaces

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Message-ID: <20160816112005.GA6621@unicorn.suse.cz>
Date:	Tue, 16 Aug 2016 13:20:05 +0200
From:	Michal Kubecek <mkubecek@...e.cz>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	netfilter-devel@...r.kernel.org, Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	Jonathan Corbet <corbet@....net>, coreteam@...filter.org,
	netdev@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, bridge@...ts.linux-foundation.org
Subject: Re: [PATCH nf-next] netfilter: allow logging from non-init namespaces

On Mon, May 16, 2016 at 08:43:16AM +0200, Michal Kubecek wrote:
> On Thu, May 12, 2016 at 11:57:26AM +0200, Pablo Neira Ayuso wrote:
> > On Wed, Apr 27, 2016 at 02:48:02PM +0200, Michal Kubecek wrote:
> > > Commit 69b34fb996b2 ("netfilter: xt_LOG: add net namespace support for
> > > xt_LOG") disabled logging packets using the LOG target from non-init
> > > namespaces. The motivation was to prevent containers from flooding
> > > kernel log of the host. The plan was to keep it that way until syslog
> > > namespace implementation allows containers to log in a safe way.
> > > 
> > > However, the work on syslog namespace seems to have hit a dead end
> > > somewhere in 2013 and there are users who want to use xt_LOG in all
> > > network namespaces. This patch allows to do so by setting
> > 
> > I understand this stuff is tricky. Did you contact already namespace
> > folks to see if they plan any move on this?
> 
> Not yet. I'll contact the people involved in the discussion about the
> serires submitted in 2013 to check what their plans are (and if there
> are any).

Sorry for the delay, there were some security bugs so that this lost my
attention.

I did some asking around and the syslog namespace work is dead. There
were some design issues that turned out to be hard to address and the
overall consensus was that use cases like netfilter logging can be
handled in a different way (e.g. using NFLOG target).

Would the patch be acceptable? (It still applies cleanly to current
nf-next tree but I can resend a rebased version if needed.)

                                                         Michal Kubecek