netdev - Re: [IPv6] interface-local multicast escapes the local node

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Date:	Wed, 06 Feb 2013 08:18:47 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>,
	Erik Hugne <erik.hugne@...csson.com>, netdev@...r.kernel.org
Subject: Re: [IPv6] interface-local multicast escapes the local node

On Wed, 2013-02-06 at 17:04 +0100, Hannes Frederic Sowa wrote:
> On Thu, Feb 07, 2013 at 12:32:17AM +0900, YOSHIFUJI Hideaki wrote:

> > Well, do you have relevant RFC?
> > RFC4291 says that we should drop ff00::/16, but not ff01::/16.
> 
> I know what you mean, the RFC does not state it directly. Hm, the BSDs seem to
> drop such destination addresses, too, if they don't originate from a loopback
> interface. Or did you mean that there is a flaw in the skb->pkt_type !=
> PACKET_LOOPBACK condition?

RFC 4291 states on page 13 :

 Interface-Local scope spans only a single interface on a node
 and is useful only for loopback transmission of multicast.

ff01::/16 are Interface-Local, or am I missing something ?



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