netdev - Re: [PATCH net] gre: add link local route when local addr is any

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Date:	Mon, 17 Feb 2014 14:09:20 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	nicolas.dichtel@...nd.com
Cc:	sesse@...fundet.no, hannes@...essinduktion.org,
	itk-intern@...fundet.no, netdev@...r.kernel.org
Subject: Re: [PATCH net] gre: add link local route when local addr is any

From: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Date: Mon, 17 Feb 2014 14:22:21 +0100

> This bug was reported by Steinar H. Gunderson and was introduced by commit
> f7cb8886335d ("sit/gre6: don't try to add the same route two times").
> 
> root@...gental:~# ip tunnel add foo mode gre remote 1.2.3.4 ttl 64
> root@...gental:~# ip link set foo up mtu 1468
> root@...gental:~# ip -6 route show dev foo
> fe80::/64  proto kernel  metric 256
> 
> but after the above commit, no such route shows up.
> 
> There is no link local route because dev->dev_addr is 0 (because local ipv4
> address is 0), hence no link local address is configured.
> 
> In this scenario, the link local address is added manually: 'ip -6 addr add
> fe80::1 dev foo' and because prefix is /128, no link local route is added by the
> kernel.
> 
> Even if the right things to do is to add the link local address with a /64
> prefix, we need to restore the previous behavior to avoid breaking userpace.
> 
> Reported-by: Steinar H. Gunderson <sesse@...fundet.no>
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>

Applied and queued up for -stable, thanks.
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