[thaller@redhat.com: rewritten commit message] https://tools.ietf.org/html/rfc8520 https://blog.apnic.net/2019/05/14/protecting-the-internet-of-things-with-mud/ https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/402 https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/463