r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
setsockopt$inet6_MCAST_MSFILTER(r0, 0x29, 0x30, &(0x7f0000000180)={0x0, {{0xa, 0x0, 0x0, @mcast2}}, 0x0, 0x500}, 0x90)