netdev - Re: [PATCH net] net: netlink: filter particular protocols from analyzers

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Date:	Thu, 5 Sep 2013 11:57:55 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	David Miller <davem@...emloft.net>
Cc:	dborkman@...hat.com, netdev@...r.kernel.org, dborkmann@...hat.com
Subject: Re: [PATCH net] net: netlink: filter particular protocols from
 analyzers

On Thu, 05 Sep 2013 14:44:42 -0400 (EDT)
David Miller <davem@...emloft.net> wrote:

> From: Daniel Borkmann <dborkman@...hat.com>
> Date: Thu,  5 Sep 2013 17:48:47 +0200
> 
> > From: Daniel Borkmann <dborkmann@...hat.com>
> > 
> > Fix finer-grained control and let only a whitelist of allowed netlink
> > protocols pass, in our case related to networking. If later on, other
> > subsystems decide they want to add their protocol as well to the list
> > of allowed protocols they shall simply add it. While at it, we also
> > need to tell what protocol is in use otherwise BPF_S_ANC_PROTOCOL can
> > not pick it up (as it's not filled out).
> > 
> > Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
> 
> This takes away functionality that I'd be more interesting in using,
> namely being able to listen to all netlink protocols using one tap.
> 
> Seriously, when I first saw this feature, that was the first way I'd
> imagine myself using it, as a tcpdump for netlink traffic, all of
> it.
> 
> If I just want to hear all netlink traffic, don't make me be forced to
> know every single NETLINK_* protocol value and have to open that many
> sockets just to do so.
> 
> It also makes it so that I can't listen to userlevel custom netlink
> protocols, another minus of filtering.
> 
> At the very least, allow an sk_protocol of zero or similar to have this
> meaning of "everything".
> 
> I'm not applying this patch, sorry.
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If you want filtering, why not add BPF (sk_filter) support to this?
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