netdev - Re: [RFC alternate] ipv6: addrconf: clean up device type handling

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Message-ID: <20140730162337.GK801478@jupiter.n2.diac24.net>
Date:	Wed, 30 Jul 2014 18:23:37 +0200
From:	David Lamparter <equinox@...c24.net>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	David Lamparter <equinox@...c24.net>, netdev@...r.kernel.org,
	Stephen Hemminger <stephen@...workplumber.org>,
	Jiri Pirko <jiri@...nulli.us>
Subject: Re: [RFC alternate] ipv6: addrconf: clean up device type handling

On Wed, Jul 30, 2014 at 06:12:35PM +0200, Hannes Frederic Sowa wrote:
> On Mi, 2014-07-30 at 17:58 +0200, David Lamparter wrote:
[cut]
> > This is an alternate version, yanking the switch() down and removing
> > dev_config/gre_config duplication.  I have no idea what rationale is behind
> > prefix_route - the result is a fe80::/64 route, but no address, which is not a
> > functioning configuration.  Jiri, you touched this just a few weeks ago, can
> > you comment?  (The "XXX: why is GRE special?")
> 
> Sure, it is valid. You can still use global addresses to talk to link
> local addresses on the same link, even from another interface.

Okay, well, that may give some purpose to it, but doesn't really explain
why GRE is special in this regard...

(And it's a violation of RFC4291 section 2.1 - "All interfaces are
required to have at least one Link-Local unicast address" - and I'd bet
on ndisc doing weird things in a setup like that.)


-David
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