blob: b36089e869f03d93dec8f83a8117e30a33efa238 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
use std::error;
pub trait Tun: Send + Sync + 'static {
type Error: error::Error;
/// Returns the MTU of the device
///
/// This function needs to be efficient (called for every read).
/// The goto implementation stragtegy is to .load an atomic variable,
/// then use e.g. netlink to update the variable in a seperate thread.
///
/// # Returns
///
/// The MTU of the interface in bytes
fn mtu(&self) -> usize;
/// Reads an IP packet into dst[offset:] from the tunnel device
///
/// The reason for providing space for a prefix
/// is to efficiently accommodate platforms on which the packet is prefaced by a header.
/// This space is later used to construct the transport message inplace.
///
/// # Arguments
///
/// - buf: Destination buffer (enough space for MTU bytes + header)
/// - offset: Offset for the beginning of the IP packet
///
/// # Returns
///
/// The size of the IP packet (ignoring the header) or an std::error::Error instance:
fn read(&self, buf: &mut [u8], offset: usize) -> Result<usize, Self::Error>;
/// Writes an IP packet to the tunnel device
///
/// # Arguments
///
/// - src: Buffer containing the IP packet to be written
///
/// # Returns
///
/// Unit type or an error
fn write(&self, src: &[u8]) -> Result<(), Self::Error>;
}
|