linux-kernel - Re: [PATCH 0/10] af_unix: add multicast and filtering features to AF

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Message-ID: <CABBYNZJWKGpkK2mSbGCQ2KkE+jC3ih-wR3JQZSMgj7AYhbxeuw@mail.gmail.com>
Date:	Fri, 2 Mar 2012 12:08:11 +0200
From:	Luiz Augusto von Dentz <luiz.dentz@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, javier.martinez@...labora.co.uk,
	rodrigo.moya@...labora.co.uk, javier@...labora.co.uk,
	lennart@...ttering.net, kay.sievers@...y.org,
	alban.crequy@...labora.co.uk, bart.cerneels@...labora.co.uk,
	sjoerd.simons@...labora.co.uk, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/10] af_unix: add multicast and filtering features to AF_UNIX

Hi David,

On Fri, Mar 2, 2012 at 10:55 AM, David Miller <davem@...emloft.net> wrote:
> From: Luiz Augusto von Dentz <luiz.dentz@...il.com>
> Date: Fri, 2 Mar 2012 10:39:24 +0200
>
>> Like I said before there is many projects using AF_UNIX as IPC
>> transport, the documentation actually induces people to use for this
>> purpose, and many would benefit from being able to do multicast.
>
> You can't have it both ways.
>
> If it's useful for many applications, then many applications would
> benefit from a userland library that solved the problem using
> existing facilities such as IP multicast.
>
> If it's only useful for dbus that that absoltely means we should
> not add thousands of lines of code to the kernel specifically for
> that application.

Instead we should add many times that into dbus-daemon and do IP
multicast, am I missing something?

> So either way, kernel changes are not justified.

I respect your opinion, but I don't agree with it, you are pushing
userspace to a much more complex solution.

At this point it would probably better to just use shared memory and
forget about any security, eavesdrop all the way.

-- 
Luiz Augusto von Dentz
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