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.
