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$sock_SIOCGIFINDEX(r2, 0x8933, &(0x7f0000000140)={'sit0\x00', <r3=>0x0})
setsockopt$inet_mreqn(r1, 0x0, 0x20, &(0x7f0000000f40)={@multicast2, @loopback, r3}, 0xc)