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

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Message-Id: <20120301.155505.674909686053535283.davem@davemloft.net>
Date:	Thu, 01 Mar 2012 15:55:05 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	javier.martinez@...labora.co.uk
Cc:	eric.dumazet@...il.com, rodrigo.moya@...labora.co.uk,
	David.Laight@...LAB.COM, 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

From: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Date: Thu, 01 Mar 2012 14:56:11 +0100

> We could use AF_INET multicast on a local machine but we need some
> ordering and control flow requirements that are not guaranteed on UDP
> multicast over IP. That's why we thought to add a new address family
> AF_MCAST.

None of this makes any sense to me.

Unless you have infinite amounts of memory you have to handle packet
drops, and the same things that handle packet drops on a protocol
level can handle out-of-order delivery too.

Stop reinventing the wheel, use facilities that exist already.
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