GuestProgrammableMacVlanFiltering

guest programmable mac/vlan filtering with macvtap

This would be nice to have to be able to do bridging or use macvlan inside the guest.

We neet to be able to:

• change mac address of the guest virtio-net interface.
• create a vlan device on the guest virtio-net device
• set promiscuous mode on guest virtio-net device
• all this controllable by host admin

TODO:

• There's a patch [1] proposed by Alex Williamson to do TX mac filtering in TUN. It's still in RFC state, no recent activity in thread. Try rewrite based on comments.

• Implement ioctl+filtering in macvtap as well. Based on above patch MAC filtering information will be forwarded to the guest kernel via TUNSETTXFILTER (indirectly).

• Implement promiscuous mode in guest virtio-net driver. No ideas here, yet.

• Control should be done via qemu/virtio features. Need a way to disable access that qemu can't override unless it has net admin capability.