I have so many questions right now.
You know #Linux, right, the thing that runs the universe today?
This FOU_ATTR_LOCAL_V6 wanted to say .len instead of .type:
https://elixir.bootlin.com/linux/v5.4/source/net/ipv4/fou.c#L665 …
This means this thing never-ever worked in any way. Any attempt to pass these args would...
The change was introduced in the commit https://github.com/torvalds/linux/commit/1713cb37bf671e5d98919536941a8b56337874fd … on 27 Mar 2019 release 5.2