r0 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$inet6(r0, &(0x7f0000000540)={0xa, 0x0, 0x0, @mcast1, 0x2}, 0x1c)
sendmsg$inet6(r0, &(0x7f0000000380)={&(0x7f0000000040)={0xa, 0x4e20, 0x0, @ipv4={'\x00', '\xff\xff', @multicast1}}, 0x1c, 0x0}, 0x880)