linux-kernel - Re: [PATCH net-next 13/15] netfilter: nfdbus: Add D-bus message parsing

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Message-ID: <20120704173047.GA8864@1984>
Date:	Wed, 4 Jul 2012 19:30:47 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Vincent Sanders <vincent.sanders@...labora.co.uk>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Alban Crequy <alban.crequy@...labora.co.uk>
Subject: Re: [PATCH net-next 13/15] netfilter: nfdbus: Add D-bus message
 parsing

On Mon, Jul 02, 2012 at 05:43:43PM +0200, Javier Martinez Canillas wrote:
> On 06/29/2012 07:11 PM, Pablo Neira Ayuso wrote:
> > On Fri, Jun 29, 2012 at 05:45:52PM +0100, Vincent Sanders wrote:
> >> From: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> >> 
> >> The netfilter D-Bus module needs to parse D-bus messages sent by
> >> applications to decide whether a peer can receive or not a D-Bus
> >> message. Add D-bus message parsing logic to be able to analyze.
> > 
> > Not talking about the entire patchset, only about the part I'm
> > responsible for.
> > 
> > I don't see why you think this belong to netfilter at all.
> > 
> > This doesn't integrate into the existing filtering infrastructure,
> > neither it extends it in any way.
> > 
> 
> Hello Pablo,
> 
> Thanks a lot for your feedback.
> 
> This is the first of a set of patches that adds a netfilter module to parse
> D-Bus messages, the complete patch-set is:
> 
> [PATCH 13/15] netfilter: nfdbus: Add D-bus message parsing
> [PATCH 14/15] netfilter: nfdbus: Add D-bus match rule implementation
> [PATCH 15/15] netfilter: add netfilter D-Bus module
> 
> patches 13 and 14 just include D-Bus helper code to be used by the netfilter
> module (added on patch 15) and specially the dbus_filter netfilter hook function.

I see, the use of the netfilter hooks seems to be the only reason why
you consider these chunks belong to netfilter.

> For the next post version we will reorganize the patches so first the D-Bus
> netfilter module is added with an empty dbus_filter function and then added the
> D-Bus helper code.
> 
> Also, we will move the nfdbus netfilter module to net/bus so is not inside the
> netfilter core code.

Yes, please, remove this stuff from my directory tree, I believe this
filtering infrastructure has not much to do with Netfilter itself.

It uses the connector to communicate kernel <-> userspace instead of
nfnetlink and, as said, it does neither integrate into existing
filtering kernel/userspace infrastructure nor integrates into it.

So, please, if you plan to give another try to this patchset, move
this to your net/bus directory as you propose and find a different
(better) name for the filtering part (just to avoid confusion in the
future).

Thanks.
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