d840445e9b
We already track this state elsewhere. No need to duplicate. The cost of calling changeState is negligible. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
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*/
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package device
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import (
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"fmt"
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"sync/atomic"
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"golang.zx2c4.com/wireguard/tun"
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)
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const DefaultMTU = 1420
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func (device *Device) RoutineTUNEventReader() {
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device.log.Verbosef("Routine: event worker - started")
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for event := range device.tun.device.Events() {
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if event&tun.EventMTUUpdate != 0 {
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mtu, err := device.tun.device.MTU()
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if err != nil {
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device.log.Errorf("Failed to load updated MTU of device: %v", err)
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continue
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}
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if mtu < 0 {
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device.log.Errorf("MTU not updated to negative value: %v", mtu)
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continue
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}
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var tooLarge string
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if mtu > MaxContentSize {
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tooLarge = fmt.Sprintf(" (too large, capped at %v)", MaxContentSize)
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mtu = MaxContentSize
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}
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old := atomic.SwapInt32(&device.tun.mtu, int32(mtu))
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if int(old) != mtu {
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device.log.Verbosef("MTU updated: %v%s", mtu, tooLarge)
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}
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}
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if event&tun.EventUp != 0 {
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device.log.Verbosef("Interface up requested")
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device.Up()
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}
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if event&tun.EventDown != 0 {
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device.log.Verbosef("Interface down requested")
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device.Down()
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}
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}
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device.log.Verbosef("Routine: event worker - stopped")
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}
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