r0 = socket$inet6_udp(0xa, 0x2, 0x0)
ioctl$sock_ipv6_tunnel_SIOCGETTUNNEL(r0, 0x8923, &(0x7f0000000100)={'sit0\x00', &(0x7f0000000080)={'ip6_vti0\x00', 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, @private2={0xfc, 0x2, '\x00', 0x1}, @mcast2}})