r0 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$inet6(r0, &(0x7f0000000000)={0xa, 0x0, 0x0, @mcast2, 0x5}, 0x1c)
sendmsg$inet6(r0, &(0x7f0000000400)={&(0x7f0000000040)={0xa, 0x4e24, 0x0, @ipv4={'\x00', '\xff\xff', @dev}}, 0x1c, 0x0}, 0x8000)
sendmmsg$inet6(r0, &(0x7f00000003c0)=[{{0x0, 0x0, &(0x7f0000000280)=[{&(0x7f0000000100)="15", 0x1}], 0x1}}], 0x1, 0x0)