netdev - Re: [PATCH v2] ipv6: addrconf: fix mcast route for GRE devices

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Date:	Thu, 31 Jul 2014 12:06:52 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	equinox@...c24.net
Cc:	netdev@...r.kernel.org, hannes@...essinduktion.org,
	stephen@...workplumber.org
Subject: Re: [PATCH v2] ipv6: addrconf: fix mcast route for GRE devices

From: David Lamparter <equinox@...c24.net>
Date: Wed, 30 Jul 2014 17:39:57 +0200

> GRE devices, for some reason, were coming up with an autoconfigured
> address, but no ff00::/8 route in the local table.  This breaks any kind
> of multicast, in particular OSPFv3, mDNS, - and ND.  In fact, IPv6 only
> works at all because there is little need for ND on PtP devices.
> 
> Adding any other IPv6 address on the device from userspace would rectify
> this issue through inet6_addr_add()/addrconf_add_dev() - and would leave
> the route around even if the address was later removed.  (This is
> probably why this issue was not discovered earlier.  AFAICS it has been
> there from the beginning, e.g. aee80b5 "generate link local address for
> GRE tunnel")
> 
> (Note: multicast is supported on GRE devices of all kinds, including PtP
> GRE, P-t-Mcast GRE and NBMA-GRE.)
> 
> Fixes: aee80b54b235 (ipv6: generate link local address for GRE tunnel)
> Signed-off-by: David Lamparter <equinox@...c24.net>
> Cc: Hannes Frederic Sowa <hannes@...essinduktion.org>
> Cc: Stephen Hemminger <stephen@...workplumber.org>

Hannes, are you OK with this version?  Please ACK if so.

Thanks.
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