From: Serhey Popovych <[email protected]>
Date: Tue, 9 Oct 2018 21:21:01 +0300
> Configuring generic network device parameters on tun will fail in
> presence of IFLA_INFO_KIND attribute in IFLA_LINKINFO nested attribute
> since tun_validate() always return failure.
>
> This can be visualized with following ip-link(8) command sequences:
>
> # ip link set dev tun0 group 100
> # ip link set dev tun0 group 100 type tun
> RTNETLINK answers: Invalid argument
>
> with contrast to dummy and veth drivers:
>
> # ip link set dev dummy0 group 100
> # ip link set dev dummy0 type dummy
>
> # ip link set dev veth0 group 100
> # ip link set dev veth0 group 100 type veth
>
> Fix by returning zero in tun_validate() when @data is NULL that is
> always in case since rtnl_link_ops->maxtype is zero in tun driver.
>
> Fixes: f019a7a594d9 ("tun: Implement ip link del tunXXX")
> Signed-off-by: Serhey Popovych <[email protected]>
Applied, thank you.
