Tokio TUN/TAP

Asynchronous allocation of TUN/TAP devices in Rust using tokio. Use async-tun for async-std version.

Getting Started

• Create a tun device using TunBuilder and read from it in a loop:

```rust

[tokio::main]

async fn main() -> Result<()> { let tun = TunBuilder::new() .name("") // if name is empty, then it is set by kernel. .tap(false) // false (default): TUN, true: TAP. .packetinfo(false) // false: IFFNOPI, default is true. .up() // or set it up manually using sudo ip link set <tun-name> up. .trybuild()?; // or .try_build_mq(queues) for multi-queue support.

println!("tun created, name: {}, fd: {}", tun.name(), tun.as_raw_fd());

let (mut reader, mut _writer) = tokio::io::split(tun);

let mut buf = [0u8; 1024];
loop {
    let n = reader.read(&mut buf).await?;
    println!("reading {} bytes: {:?}", n, &buf[..n]);
}

} ```

• Run the code using sudo:

bash ➜ sudo -E /path/to/cargo run

• Set the address of device (address and netmask could also be set using TunBuilder):

bash ➜ sudo ip a add 10.0.0.1/24 dev <tun-name>

• Ping to read packets:

bash ➜ ping 10.0.0.2

• Display devices and analyze the network traffic:

➜ ip tuntap ➜ sudo tshark -i <tun-name>

Supported Platforms

• [x] Linux
• [ ] FreeBSD
• [ ] Android
• [ ] OSX
• [ ] iOS
• [ ] Windows

Examples

• read: Split tun to (reader, writer) pair and read packets from reader.
• read-mq: Read from multi-queue tun using tokio::select!.