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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
*/
package tunnel
import (
"log"
"sync"
"golang.org/x/sys/windows"
"golang.zx2c4.com/wireguard/device"
"golang.zx2c4.com/wireguard/tun"
"golang.zx2c4.com/wireguard/windows/conf"
"golang.zx2c4.com/wireguard/windows/services"
"golang.zx2c4.com/wireguard/windows/tunnel/firewall"
"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
)
type interfaceWatcherError struct {
serviceError services.Error
err error
}
type interfaceWatcherEvent struct {
luid winipcfg.LUID
family winipcfg.AddressFamily
}
type interfaceWatcher struct {
errors chan interfaceWatcherError
device *device.Device
conf *conf.Config
tun *tun.NativeTun
setupMutex sync.Mutex
routeChangeCallback4 *winipcfg.RouteChangeCallback
routeChangeCallback6 *winipcfg.RouteChangeCallback
interfaceChangeCallback *winipcfg.InterfaceChangeCallback
storedEvents []interfaceWatcherEvent
}
func (iw *interfaceWatcher) setup(family winipcfg.AddressFamily) {
var routeChangeCallback **winipcfg.RouteChangeCallback
var ipversion string
if family == windows.AF_INET {
routeChangeCallback = &iw.routeChangeCallback4
ipversion = "v4"
} else if family == windows.AF_INET6 {
routeChangeCallback = &iw.routeChangeCallback6
ipversion = "v6"
} else {
return
}
if *routeChangeCallback != nil {
(*routeChangeCallback).Unregister()
*routeChangeCallback = nil
}
var err error
log.Printf("Monitoring default %s routes", ipversion)
*routeChangeCallback, err = monitorDefaultRoutes(family, iw.device, iw.conf.Interface.MTU == 0, iw.tun)
if err != nil {
iw.errors <- interfaceWatcherError{services.ErrorBindSocketsToDefaultRoutes, err}
return
}
log.Printf("Setting device %s addresses", ipversion)
err = configureInterface(family, iw.conf, iw.tun)
if err != nil {
iw.errors <- interfaceWatcherError{services.ErrorSetNetConfig, err}
return
}
}
func watchInterface() (*interfaceWatcher, error) {
iw := &interfaceWatcher{
errors: make(chan interfaceWatcherError, 2),
}
var err error
iw.interfaceChangeCallback, err = winipcfg.RegisterInterfaceChangeCallback(func(notificationType winipcfg.MibNotificationType, iface *winipcfg.MibIPInterfaceRow) {
iw.setupMutex.Lock()
defer iw.setupMutex.Unlock()
if notificationType != winipcfg.MibAddInstance {
return
}
if iw.tun == nil {
iw.storedEvents = append(iw.storedEvents, interfaceWatcherEvent{iface.InterfaceLUID, iface.Family})
return
}
if iface.InterfaceLUID != winipcfg.LUID(iw.tun.LUID()) {
return
}
iw.setup(iface.Family)
})
if err != nil {
return nil, err
}
return iw, nil
}
func (iw *interfaceWatcher) Configure(device *device.Device, conf *conf.Config, tun *tun.NativeTun) {
iw.setupMutex.Lock()
defer iw.setupMutex.Unlock()
iw.device, iw.conf, iw.tun = device, conf, tun
for _, event := range iw.storedEvents {
if event.luid == winipcfg.LUID(iw.tun.LUID()) {
iw.setup(event.family)
}
}
iw.storedEvents = nil
}
func (iw *interfaceWatcher) Destroy() {
iw.setupMutex.Lock()
defer iw.setupMutex.Unlock()
if iw.tun == nil {
return
}
if iw.routeChangeCallback4 != nil {
iw.routeChangeCallback4.Unregister()
iw.routeChangeCallback4 = nil
}
if iw.routeChangeCallback6 != nil {
iw.routeChangeCallback6.Unregister()
iw.routeChangeCallback6 = nil
}
if iw.interfaceChangeCallback != nil {
iw.interfaceChangeCallback.Unregister()
iw.interfaceChangeCallback = nil
}
firewall.DisableFirewall()
// It seems that the Windows networking stack doesn't like it when we destroy interfaces that have active
// routes, so to be certain, just remove everything before destroying.
luid := winipcfg.LUID(iw.tun.LUID())
luid.FlushRoutes(windows.AF_INET)
luid.FlushIPAddresses(windows.AF_INET)
luid.FlushRoutes(windows.AF_INET6)
luid.FlushIPAddresses(windows.AF_INET6)
luid.FlushDNS()
}
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