linux-kernel - Re: [PATCH nf-next v2] netfilter: allow logging from non-init namespaces

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Date:   Thu, 2 Feb 2017 14:25:22 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     Patrick McHardy <kaber@...sh.net>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH nf-next v2] netfilter: allow logging from non-init
 namespaces

On Tue, Jan 31, 2017 at 10:30:06AM +0100, 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
> 
>   /proc/sys/net/netfilter/nf_log_all_netns
> 
> to a nonzero value. This sysctl is only accessible from init_net so that
> one cannot switch the behaviour from inside a container.

Applied, thanks Michal!