r0 = socket$inet6_udp(0xa, 0x2, 0x0)
ioctl$sock_ipv6_tunnel_SIOCGETTUNNEL(r0, 0x89f0, &(0x7f0000000500)={'sit0\x00', &(0x7f0000000580)={'syztnl2\x00', 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, @dev, @ipv4={'\x00', '\xff\xff', @multicast1}}})