r0 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$inet6(r0, &(0x7f0000000100)={0xa, 0x0, 0x0, @remote, 0x2}, 0x1c)
r1 = fcntl$dupfd(r0, 0x0, r0)
r2 = socket$packet(0x11, 0x2, 0x300)
ioctl$sock_SIOCGIFINDEX(r2, 0x8933, &(0x7f0000000000)={'sit0\x00', <r3=>0x0})
sendmmsg$inet6(r1, &(0x7f0000002fc0)=[{{0x0, 0x0, 0x0}}, {{0x0, 0x0, 0x0, 0x0, &(0x7f0000000000)=[@pktinfo={{0x24, 0x29, 0x32, {@mcast1, r3}}}], 0x28}}], 0x2, 0x0)