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Date:   Fri, 17 May 2019 22:30:15 +0200
From:   "Jason A. Donenfeld" <>
To:     David Ahern <>
Cc:     Stephen Hemminger <>,, Netdev <>,
        Alexey Kuznetsov <>,
        David Miller <>,
Subject: Re: 5.1 `ip route get addr/cidr` regression

On Fri, May 17, 2019 at 10:19 PM Jason A. Donenfeld <> wrote:
> On Fri, May 17, 2019 at 7:39 PM David Ahern <> 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 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 dev wg0
+ ip link set wg0 up
+ ip route get
Error: ipv4: Invalid values in header for route

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