[libvirt] Libvirt, nwfilter, openvswitch

Hello, I _was_ trying to set up an nwfilter for our networking set-up with VXLAN and openvswitch, where we use VXLAN as carrier for separate networks (unlike OpenStack gre-tunnels). But with OVS, ebtables do not work, and the basic setup of nwfilter rules are based on this premise... or so I understand... Now.. Is there a way to define nwfilter rules _without_ ebtables ? What I would like to do is quite simple (block out dhcp{4,6} services from VM's, and ipv6 router advertisements ) Thanks