Add experimental_fix_windows_firewall option for system tun stack

experimental/libbox/platform.go

@@ -18,6 +18,7 @@ type PlatformInterface interface {
 	CloseDefaultInterfaceMonitor(listener InterfaceUpdateListener) error
 	UsePlatformInterfaceGetter() bool
 	GetInterfaces() (NetworkInterfaceIterator, error)
+	UnderNetworkExtension() bool
 }
 
 type TunInterface interface {

experimental/libbox/platform/interface.go

@@ -22,6 +22,7 @@ type Interface interface {
 	CreateDefaultInterfaceMonitor(errorHandler E.Handler) tun.DefaultInterfaceMonitor
 	UsePlatformInterfaceGetter() bool
 	Interfaces() ([]NetworkInterface, error)
+	UnderNetworkExtension() bool
 	process.Searcher
 	io.Writer
 }

experimental/libbox/service.go

@@ -169,3 +169,7 @@ func (w *platformInterfaceWrapper) Interfaces() ([]platform.NetworkInterface, er
 	}
 	return interfaces, nil
 }
+
+func (w *platformInterfaceWrapper) UnderNetworkExtension() bool {
+	return w.iif.UnderNetworkExtension()
+}