failed to create tun device on freebsd

[lakako]

When set tun name, tun will raise Error: Io(Os { code: 2, kind: NotFound, message: "No such file or directory" })

use std::io::Read;

fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync + 'static>> {
    let mut config = tun::Configuration::default();
    config
        .tun_name("utun0")
        .address((10, 0, 0, 9))
        .netmask((255, 255, 255, 0))
        .destination((10, 0, 0, 1))
        .up();

    #[cfg(target_os = "linux")]
    config.platform_config(|config| {
        // requiring root privilege to acquire complete functions
        config.ensure_root_privileges(true);
    });

    println!("before tun created");
    let mut dev = tun::create(&config)?;
    println!("tun created");
    let mut buf = [0; 4096];

    loop {
        let amount = dev.read(&mut buf)?;
        println!("{:?}", &buf[0..amount]);
    }
}