netdev - Re: [v3] net: ipv6: fallback to full lookup if table lookup is unsuitable

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Message-Id: <20160920.032910.512829220195292472.davem@davemloft.net>
Date:   Tue, 20 Sep 2016 03:29:10 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     vincent@...nat.im
Cc:     dsa@...ulusnetworks.com, kuznet@....inr.ac.ru, jmorris@...ei.org,
        yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org
Subject: Re: [v3] net: ipv6: fallback to full lookup if table lookup is
 unsuitable

From: Vincent Bernat <vincent@...nat.im>
Date: Sun, 18 Sep 2016 17:46:07 +0200

> Commit 8c14586fc320 ("net: ipv6: Use passed in table for nexthop
> lookups") introduced a regression: insertion of an IPv6 route in a table
> not containing the appropriate connected route for the gateway but which
> contained a non-connected route (like a default gateway) fails while it
> was previously working:
> 
>     $ ip link add eth0 type dummy
>     $ ip link set up dev eth0
>     $ ip addr add 2001:db8::1/64 dev eth0
>     $ ip route add ::/0 via 2001:db8::5 dev eth0 table 20
>     $ ip route add 2001:db8:cafe::1/128 via 2001:db8::6 dev eth0 table 20
>     RTNETLINK answers: No route to host
>     $ ip -6 route show table 20
>     default via 2001:db8::5 dev eth0  metric 1024  pref medium
> 
> After this patch, we get:
> 
>     $ ip route add 2001:db8:cafe::1/128 via 2001:db8::6 dev eth0 table 20
>     $ ip -6 route show table 20
>     2001:db8:cafe::1 via 2001:db8::6 dev eth0  metric 1024  pref medium
>     default via 2001:db8::5 dev eth0  metric 1024  pref medium
> 
> Fixes: 8c14586fc320 ("net: ipv6: Use passed in table for nexthop lookups")
> Signed-off-by: Vincent Bernat <vincent@...nat.im>

Applied and queued up for -stable, thanks.