netdev - Re: 5.1 `ip route get addr/cidr` regression

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Date:   Fri, 17 May 2019 22:30:15 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     David Ahern <dsahern@...il.com>
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        emersonbernier@...anota.com, Netdev <netdev@...r.kernel.org>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        David Miller <davem@...emloft.net>, piraty1@...ox.ru
Subject: Re: 5.1 `ip route get addr/cidr` regression

On Fri, May 17, 2019 at 10:19 PM Jason A. Donenfeld <Jason@...c4.com> wrote:
>
> On Fri, May 17, 2019 at 7:39 PM David Ahern <dsahern@...il.com> wrote:
> > Not sure why Jason is not seeing that. Really odd that he hits the error
> > AND does not get a message back since it requires an updated ip command
> > to set the strict checking flag and that command understands extack.
> > Perhaps no libmnl?
>
> Right, no libmnl. This is coming out of the iproute2 compiled for the
> tests at https://www.wireguard.com/build-status/ which are pretty
> minimal. Extact support would be kind of useful for diagnostics, and
> wg(8) already uses it, so I can probably put that in my build system.

Voila, extack:

+ ip link add wg0 type dummy
+ ip addr add 192.168.4.2/24 dev wg0
+ ip link set wg0 up
+ ip route get 192.168.4.0/24
Error: ipv4: Invalid values in header for route