r0 = socket$inet6_udp(0xa, 0x2, 0x0)
ioctl$sock_ipv6_tunnel_SIOCGETTUNNEL(r0, 0x8922, &(0x7f0000000240)={'sit0\x00', &(0x7f00000001c0)={'syztnl0\x00', 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, @private2, @mcast1}})