netdev - Re: [PATCH 1/1] netfilter: Add possibility to turn off netfilters defrag per netns

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Date:	Tue, 10 Jan 2012 04:17:14 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Hans Schillstrom <hans.schillstrom@...csson.com>
Cc:	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	Jan Engelhardt <jengelh@...ozas.de>,
	Patrick McHardy <kaber@...sh.net>,
	"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/1] netfilter: Add possibility to turn off netfilters
 defrag per netns

Hi Hans,

On Mon, Jan 09, 2012 at 09:58:42AM +0100, Hans Schillstrom wrote:
> > I wonder if we can conditionally register the sysctl only if we are
> > inside one lxc container.
> > 
> Sure no problem, but the code will not be so nice ... 

Indeed, ugly indeed.

> > I'm telling this because this sysctl does not seem to make any sense
> > to me outside of it.
> 
> I'm not so sure that we should make it asymetric,
> but it's not a big deal.
> 
> Anyway here is a sample of the sysctl in a namespace.
> It is the  "if (!net_eq(net, &init_net)) {..." that does the magic

Hm, after having a look at it, I think I prefer to provide some
inconditional sysctl.

Better call it nf_conntrack_enable and set it to 1 by default. AFAICS,
this will be a synonymous of:

iptables -I PREROUTING -t raw -j NOTRACK

This option is disabling conntracking after all. I don't think we
would ever support conntrack with fragments.

Please, send a patch including in the description that we need this
for lxc, I'll enqueue it for net-next unless someone raise the hand
with a better solution.

Thanks.
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