netdev - IPv6 multipath routes

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Message-Id: <1346952649-5716-1-git-send-email-bernat@luffy.cx>
Date:	Thu,  6 Sep 2012 19:30:48 +0200
From:	Vincent Bernat <bernat@...fy.cx>
To:	netdev@...r.kernel.org
Subject: IPv6 multipath routes

Hi!

It appears that "ip -6 route add" expects IPv4 addresses with nexthop directives:

$ ip -6 route add to 2a01:c9c0:a1:982::/64 proto bird \
   nexthop via fe80::ea39:35ff:febd:f9e dev bai2.2008 weight 1 \
   nexthop via fe80::ea39:35ff:febd:fd6 dev bai1.2009 weight 1
Error: an IP address is expected rather than "fe80::ea39:35ff:febd:f9e"

The following patch fix this problem. However, it does not work. I now have:
 RTNETLINK answers: No such device

I have little knowledge of netlink so it is likely that my patch is
buggy. However, I have found this problem by trying to debug what
appears to be a valid netlink message refused by the kernel with the
same error. Therefore, I suspect that there is also a bug in the kernel.

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