From mboxrd@z Thu Jan  1 00:00:00 1970
From: Luca Boccassi <bluca@debian.org>
Subject: Re: [iproute2] Bug#898840: Latest update breaks ip6 default gateway
 cli api
Date: Wed, 16 May 2018 14:42:24 +0100
Message-ID: <1526478144.23337.126.camel@debian.org>
References: <4de26023-48bf-fb98-2592-6fe5a6bc5c49@mendix.com>
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Cc: Hans van Kranenburg <hans.van.kranenburg@mendix.com>,
        898840@bugs.debian.org, netdev@vger.kernel.org
To: Serhey Popovych <serhe.popovych@gmail.com>,
        Stephen Hemminger <stephen@networkplumber.org>
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On Wed, 2018-05-16 at 14:26 +0200, Hans van Kranenburg wrote:
> Package: iproute2
> Version: 4.16.0-2
> Severity: normal
>=20
> Hi,
>=20
> The last iproute2 update has a backwards incompatible change in
> setting
> IPv6 default routes, breaking existing configuration and scripts.
>=20
> Previously, the following was possible, and now it requires an
> explicit
> -6 option to be added:
>=20
> -# ip route add default via 2001:db8::1 dev eth0
> Error: inet address is expected rather than "2001:db8::1".
>=20
> This works:
> -# ip -6 route add default via 2001:db8::1 dev eth0
>=20
> I found out after having systems end up being unreachable after a
> reboot, because I have commands like these in network/interfaces.
>=20
> I had a look at upstream changelogs, but I don't see any mention of
> this, and suspect it was not intentional. However, it's bad.

Hello Serhey and Stephen,

Hans reported a regression in v4.16.0, ip route now requires -6 to be
manually added when using v6 addresses while up to 4.15 it didn't, the
commands quoted show the problem.

Bisecting shows that the following commit from Serhey introduced the
problem:

93fa12418dc6f5943692250244be303bb162175b
utils: Always specify family and ->bytelen in get_prefix_1()

Could you please have a look when you have a moment? It's very easy to
reproduce, and it breaks existing scripts and so on.

Thanks!

--=20
Kind regards,
Luca Boccassi
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