r0 = socket$inet6_udp(0xa, 0x2, 0x0)
sendmmsg$inet6(r0, &(0x7f0000003700)=[{{&(0x7f0000000080)={0xa, 0x4e22, 0x0, @mcast1}, 0x1c, 0x0, 0x0, &(0x7f00000000c0)=[@pktinfo={{0x24, 0x29, 0x32, {@loopback}}}, @rthdrdstopts={{0x18}}], 0x40}}], 0x1, 0x0)