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/* 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.debugf("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.errorf("Failed to load updated MTU of device: %v", err)
} else if int(old) != mtu {
if mtu+MessageTransportSize > MaxMessageSize {
device.infof("MTU updated: %v (too large)", mtu)
} else {
device.infof("MTU updated: %v", mtu)
}
atomic.StoreInt32(&device.tun.mtu, int32(mtu))
}
}
if event&tun.EventUp != 0 && !setUp {
device.infof("Interface set up")
setUp = true
device.Up()
}
if event&tun.EventDown != 0 && setUp {
device.infof("Interface set down")
setUp = false
device.Down()
}
}
device.debugf("Routine: event worker - stopped")
device.state.stopping.Done()
}
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