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Date:	Wed, 30 Jul 2014 18:12:35 +0200
From:	Hannes Frederic Sowa <>
To:	David Lamparter <>
	Stephen Hemminger <>,
	Jiri Pirko <>
Subject: Re: [RFC alternate] ipv6: addrconf: clean up device type handling

On Mi, 2014-07-30 at 17:58 +0200, David Lamparter wrote:
> This realigns addrconf support for the various lower-layer device types,
> and removes a little bit of duplicate code.
> For GRE devices, this includes a semantic change in that there is now a
> ff00::/8 route installed on address autogeneration.  This was previously
> missing and broke any kind of IPv6 multicast - unless another address
> was configured from userspace (which then added the missing ff00::/8).
> Fixes: aee80b54b235 (ipv6: generate link local address for GRE tunnel)
> Signed-off-by: David Lamparter <>
> Cc: Hannes Frederic Sowa <>
> Cc: Stephen Hemminger <>
> Cc: Jiri Pirko <>
> ---
> 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.

I prefer this patch.


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