[ovirt-users] Defining custom network filter or editing existing

All, I was wondering if someone can point me in the direction of the documentation related to defining custom network filters (nwfilter) in 4.2. I found the docs on assigning a network filter to a vNIC profile, but I cannot find any mention of how you can create your own. Normally you'd use 'virst nwfilter-define', but that is locked out since vdsm manages everything. I need to expand clean-traffic's scope to include ipv6, since it doesn't handle ipv6 at all by default, it seems. Thanks, -Tim