r0 = socket$inet_tcp(0x2, 0x1, 0x0)
setsockopt$inet_MCAST_MSFILTER(r0, 0x0, 0x30, &(0x7f00000005c0)={0x0, {{0x2, 0x0, @loopback}}, 0x0, 0x2, [{{0x2, 0x0, @empty}}, {{0x2, 0x0, @multicast2}}]}, 0x190)