r0 = socket$inet6_udp(0xa, 0x2, 0x0)
sendmmsg$inet6(r0, &(0x7f00000021c0)=[{{&(0x7f0000000000)={0xa, 0x4e20, 0x0, @mcast1}, 0x1c, 0x0, 0x0, &(0x7f0000002400)=[@flowinfo={{0x14, 0x29, 0xb, 0x6}}, @flowinfo={{0x14}}], 0x30}}], 0x1, 0x0)