How to make on one bridge (bridge) NAT for ipv4 and direct routing for ipv6?

Question

linux

I raise virtual machines on the server with xen.
I have one ipv4 address and /64 ipv6 addresses.
The task is to make it so that through one bridge interface (bridge) my virtual machines can access the Internet. That being said, I don't want to use NAT for IPv6 (IPv4 only).
br0 is assigned my external ipv4 address and one of the ipv6 addresses.
Now I use two interfaces in virtual machines:
1) Interface for IPv6 (eg vif1.0). On dom0, it is combined into a bridge br0 with enp2s0 (the server's external interface), ipv6 traffic is "bridging" through it (how can I put it humanly?). In virtual machines, this interface has public ipv6 addresses, ipv4 is not assigned to it.
2) Interface for ipv4 (eg vif1.1). Consolidates into a separate xenbr0 bridge that is assigned the address 10.0.1.1. In the virtual machine, an IPv4 address from the 10.0.1.0/24 range is hung on this interface, and on dom0 it is SNAT'ed into my public ipv4.
I tried to combine these two bridges into one, forbidding ipv4 to "bridge" using ebtables as indicated in the example , but the traffic stopped walking altogether.
Thank you in advance.

Answer 1

I'm thinking of digging towards the radvd daemon.
If I understand everything correctly, then in my LAN I have gray ipv4 issued by the router, and white ipv6 issued by the radvd proxy, they work just like that.