r0 = socket$inet6_udp(0xa, 0x2, 0x0)
ioctl$sock_inet6_SIOCADDRT(r0, 0x890b, &(0x7f0000000080)={@ipv4={'\x00', '\xff\xff', @multicast1}, @initdev={0xfe, 0x88, '\x00', 0x0, 0x0}, @private2, 0x0, 0x8000})