let build = iface: mac: rest: {
    systemd.network.enable = true;
    systemd.network.links."${iface}" = {
      linkConfig.Name = iface;
      matchConfig.PermanentMACAddress = mac;
    };
    systemd.network.networks."${iface}".enable = true;
} // rest; in
{
  bridge = bridge: ip: gateway: build {
      systemd.network.networks."${iface}".bridge = [ bridge ];
      systemd.network.networks."${bridge}" = {
        address = [ ip ];
        gateway = [ gateway ];
      };
      systemd.network.netdevs."${bridge}" = {
        netdevConfig = {
          Name = bridge;
          Kind = "bridge";
        };
      };
    };
  dhcp = build {
    systemd.network.networks."${iface}" = {
      DHCP = "yes";
    };
  };
}