netdev - Re: [PATCH net-next] net: ipv6: put autoconf routes into per-interface tables

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Date:   Thu, 12 Jan 2017 08:17:18 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Lorenzo Colitti <lorenzo@...gle.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Maciej Żenczykowski <zenczykowski@...il.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        Erik Kline <ek@...gle.com>,
        YOSHIFUJI Hideaki <hideaki.yoshifuji@...aclelinux.com>,
        David Miller <davem@...emloft.net>,
        Daniel Rosenberg <drosen@...gle.com>
Subject: Re: [PATCH net-next] net: ipv6: put autoconf routes into
 per-interface tables

On 1/9/17 7:01 PM, Lorenzo Colitti wrote:
> On Sun, Jan 8, 2017 at 1:24 PM, David Ahern <dsa@...ulusnetworks.com> wrote:
>> Why not use the VRF capability then? create a VRF and assign the interface to it. End result is the same -- separate tables and the need to use a bind-to-device API to hit those routes.
> 
> Requiring that VRFs for this creates additional complexity, because
> each network now requires its own VRF. That means that the connection
> manager must create the VRF before the interface comes up and receives
> the RA.
> 
> In some cases this might not be possible. For example, consider a tun
> interface that's created by a different process such as a VPN client.
> In this case the connection manager doesn't know the interface name,
> and the VPN client doesn't know to create the VRF, so if the tun
> interface gets an RA after the tun is created but

Have you looked at adding basic l3mdev capabilities to tun? in this case just l3mdev_fib_table needs be implemented. On interface create push down a table id and set the IFF_L3MDEV_MASTER flag.