On Fri, 17 May 2019 09:17:51 -0600
David Ahern <dsah...@gmail.com> wrote:
> On 5/17/19 4:22 AM, Jason A. Donenfeld wrote:
> > Hi,
> >
> > I'm back now and catching up with a lot of things. A few people have
> > mentioned to me that wg-quick(8), a bash script that makes a bunch of
> > iproute2 invocations, appears to be broken on 5.1. I've distilled the
> > behavior change down to the following.
> >
> > Behavior on 5.0:
> >
> > + ip link add wg0 type dummy
> > + ip address add 192.168.50.2/24 dev wg0
> > + ip link set mtu 1420 up dev wg0
> > + ip route get 192.168.50.0/24
> > broadcast 192.168.50.0 dev wg0 src 192.168.50.2 uid 0
> > cache <local,brd>
> >
> > Behavior on 5.1:
> >
> > + ip link add wg0 type dummy
> > + ip address add 192.168.50.2/24 dev wg0
> > + ip link set mtu 1420 up dev wg0
> > + ip route get 192.168.50.0/24
> > RTNETLINK answers: Invalid argument
>
> This is a 5.1 change.
> a00302b607770 ("net: ipv4: route: perform strict checks also for doit
> handlers")
>
> Basically, the /24 is unexpected. I'll send a patch.
>
> >
> > Upon investigating, I'm not sure that `ip route get` was ever suitable
> > for getting details on a particular route. So I'll adjust the
>
> 'ip route get <prefix> fibmatch' will show the fib entry.
>
If you want to keep the error, the kernel should send additional
extack as to reason. EINVAL is not user friendly...
