r0 = socket$inet6_udp(0xa, 0x2, 0x0)
ioctl$sock_inet6_SIOCADDRT(r0, 0x890b, &(0x7f0000000240)={@mcast2, @ipv4={'\x00', '\xff\xff', @dev}, @private2, 0x50, 0x0, 0x0, 0x400})