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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
*/
package tun
import (
"os"
)
type Event int
const (
EventUp = 1 << iota
EventDown
EventMTUUpdate
)
type Device interface {
// File returns the file descriptor of the device.
File() *os.File
// Read one or more packets from the Device (without any additional headers).
// On a successful read it returns the number of packets read, and sets
// packet lengths within the sizes slice. len(sizes) must be >= len(bufs).
// A nonzero offset can be used to instruct the Device on where to begin
// reading into each element of the bufs slice.
Read(bufs [][]byte, sizes []int, offset int) (n int, err error)
// Write one or more packets to the device (without any additional headers).
// On a successful write it returns the number of packets written. A nonzero
// offset can be used to instruct the Device on where to begin writing from
// each packet contained within the bufs slice.
Write(bufs [][]byte, offset int) (int, error)
// MTU returns the MTU of the Device.
MTU() (int, error)
// Name returns the current name of the Device.
Name() (string, error)
// Events returns a channel of type Event, which is fed Device events.
Events() <-chan Event
// Close stops the Device and closes the Event channel.
Close() error
// BatchSize returns the preferred/max number of packets that can be read or
// written in a single read/write call. BatchSize must not change over the
// lifetime of a Device.
BatchSize() int
}
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