wireguard-go/device/tun.go
Jason A. Donenfeld d669c78c43 device: combine debug and info log levels into 'verbose'
There are very few cases, if any, in which a user only wants one of
these levels, so combine it into a single level.

While we're at it, reduce indirection on the loggers by using an empty
function rather than a nil function pointer. It's not like we have
retpolines anyway, and we were always calling through a function with a
branch prior, so this seems like a net gain.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-01-26 23:05:48 +01:00

52 lines
1.2 KiB
Go

/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2020 WireGuard LLC. All Rights Reserved.
*/
package device
import (
"sync/atomic"
"golang.zx2c4.com/wireguard/tun"
)
const DefaultMTU = 1420
func (device *Device) RoutineTUNEventReader() {
setUp := false
device.log.Verbosef("Routine: event worker - started")
for event := range device.tun.device.Events() {
if event&tun.EventMTUUpdate != 0 {
mtu, err := device.tun.device.MTU()
old := atomic.LoadInt32(&device.tun.mtu)
if err != nil {
device.log.Errorf("Failed to load updated MTU of device: %v", err)
} else if int(old) != mtu {
if mtu+MessageTransportSize > MaxMessageSize {
device.log.Verbosef("MTU updated: %v (too large)", mtu)
} else {
device.log.Verbosef("MTU updated: %v", mtu)
}
atomic.StoreInt32(&device.tun.mtu, int32(mtu))
}
}
if event&tun.EventUp != 0 && !setUp {
device.log.Verbosef("Interface set up")
setUp = true
device.Up()
}
if event&tun.EventDown != 0 && setUp {
device.log.Verbosef("Interface set down")
setUp = false
device.Down()
}
}
device.log.Verbosef("Routine: event worker - stopped")
device.state.stopping.Done()
}