r0 = socket$inet_udp(0x2, 0x2, 0x0)
sendmmsg$inet(r0, &(0x7f0000004e00)=[{{&(0x7f0000000000)={0x2, 0x4e23, @multicast1}, 0x10, 0x0, 0x0, &(0x7f00000016c0)=[@ip_pktinfo={{0x1c, 0x0, 0x8, {0x0, @loopback, @loopback}}}, @ip_retopts={{0x14, 0x0, 0x7, {[@timestamp_addr={0x44, 0x4, 0xe9}]}}}], 0x38}}], 0x1, 0x4010)