vnet: fix issues (#4771)

client/admin_api.go

@@ -165,9 +165,9 @@ func (svr *Service) apiStatus(w http.ResponseWriter, _ *http.Request) {
 		res StatusResp = make(map[string][]ProxyStatusResp)
 	)
 
-	log.Infof("Http request [/api/status]")
+	log.Infof("http request [/api/status]")
 	defer func() {
-		log.Infof("Http response [/api/status]")
+		log.Infof("http response [/api/status]")
 		buf, _ = json.Marshal(&res)
 		_, _ = w.Write(buf)
 	}()
@@ -198,9 +198,9 @@ func (svr *Service) apiStatus(w http.ResponseWriter, _ *http.Request) {
 func (svr *Service) apiGetConfig(w http.ResponseWriter, _ *http.Request) {
 	res := GeneralResponse{Code: 200}
 
-	log.Infof("Http get request [/api/config]")
+	log.Infof("http get request [/api/config]")
 	defer func() {
-		log.Infof("Http get response [/api/config], code [%d]", res.Code)
+		log.Infof("http get response [/api/config], code [%d]", res.Code)
 		w.WriteHeader(res.Code)
 		if len(res.Msg) > 0 {
 			_, _ = w.Write([]byte(res.Msg))
@@ -228,9 +228,9 @@ func (svr *Service) apiGetConfig(w http.ResponseWriter, _ *http.Request) {
 func (svr *Service) apiPutConfig(w http.ResponseWriter, r *http.Request) {
 	res := GeneralResponse{Code: 200}
 
-	log.Infof("Http put request [/api/config]")
+	log.Infof("http put request [/api/config]")
 	defer func() {
-		log.Infof("Http put response [/api/config], code [%d]", res.Code)
+		log.Infof("http put response [/api/config], code [%d]", res.Code)
 		w.WriteHeader(res.Code)
 		if len(res.Msg) > 0 {
 			_, _ = w.Write([]byte(res.Msg))

client/control.go

@@ -189,7 +189,7 @@ func (ctl *Control) handlePong(m msg.Message) {
 	inMsg := m.(*msg.Pong)
 
 	if inMsg.Error != "" {
-		xl.Errorf("Pong message contains error: %s", inMsg.Error)
+		xl.Errorf("pong message contains error: %s", inMsg.Error)
 		ctl.closeSession()
 		return
 	}

client/service.go

@@ -341,7 +341,7 @@ func (svr *Service) loopLoginUntilSuccess(maxInterval time.Duration, firstLoginE
 		ctl, err := NewControl(svr.ctx, sessionCtx)
 		if err != nil {
 			conn.Close()
-			xl.Errorf("NewControl error: %v", err)
+			xl.Errorf("new control error: %v", err)
 			return false, err
 		}
 		ctl.SetInWorkConnCallback(svr.handleWorkConnCb)

pkg/plugin/client/virtual_net.go

@@ -18,9 +18,10 @@ package client
 
 import (
 	"context"
+	"io"
+	"sync"
 
 	v1 "github.com/fatedier/frp/pkg/config/v1"
-	"github.com/fatedier/frp/pkg/util/xlog"
 )
 
 func init() {
@@ -30,6 +31,8 @@ func init() {
 type VirtualNetPlugin struct {
 	pluginCtx PluginContext
 	opts      *v1.VirtualNetPluginOptions
+	mu        sync.Mutex
+	conns     map[io.ReadWriteCloser]struct{}
 }
 
 func NewVirtualNetPlugin(pluginCtx PluginContext, options v1.ClientPluginOptions) (Plugin, error) {
@@ -43,19 +46,32 @@ func NewVirtualNetPlugin(pluginCtx PluginContext, options v1.ClientPluginOptions
 }
 
 func (p *VirtualNetPlugin) Handle(ctx context.Context, connInfo *ConnectionInfo) {
-	xl := xlog.FromContextSafe(ctx)
-
 	// Verify if virtual network controller is available
 	if p.pluginCtx.VnetController == nil {
 		return
 	}
 
-	// Register the connection with the controller
+	// Add the connection before starting the read loop to avoid race condition
-	routeName := p.pluginCtx.Name
+	// where RemoveConn might be called before the connection is added.
-	err := p.pluginCtx.VnetController.RegisterServerConn(ctx, routeName, connInfo.Conn)
+	p.mu.Lock()
-	if err != nil {
+	if p.conns == nil {
-		xl.Errorf("virtual net failed to register server connection: %v", err)
+		p.conns = make(map[io.ReadWriteCloser]struct{})
-		return
+	}
+	p.conns[connInfo.Conn] = struct{}{}
+	p.mu.Unlock()
+
+	// Register the connection with the controller and pass the cleanup function
+	p.pluginCtx.VnetController.StartServerConnReadLoop(ctx, connInfo.Conn, func() {
+		p.RemoveConn(connInfo.Conn)
+	})
+}
+
+func (p *VirtualNetPlugin) RemoveConn(conn io.ReadWriteCloser) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	// Check if the map exists, as Close might have set it to nil concurrently
+	if p.conns != nil {
+		delete(p.conns, conn)
 	}
 }
 
@@ -64,8 +80,13 @@ func (p *VirtualNetPlugin) Name() string {
 }
 
 func (p *VirtualNetPlugin) Close() error {
-	if p.pluginCtx.VnetController != nil {
+	p.mu.Lock()
-		p.pluginCtx.VnetController.UnregisterServerConn(p.pluginCtx.Name)
+	defer p.mu.Unlock()
+
+	// Close any remaining connections
+	for conn := range p.conns {
+		_ = conn.Close()
 	}
+	p.conns = nil
 	return nil
 }

pkg/plugin/visitor/virtual_net.go

@@ -60,7 +60,7 @@ func NewVirtualNetPlugin(pluginCtx PluginContext, options v1.VisitorPluginOption
 		return nil, errors.New("destinationIP is required")
 	}
 
-	// Parse DestinationIP as a single IP and create a host route
+	// Parse DestinationIP and create a host route.
 	ip := net.ParseIP(opts.DestinationIP)
 	if ip == nil {
 		return nil, fmt.Errorf("invalid destination IP address [%s]", opts.DestinationIP)
@@ -91,7 +91,7 @@ func (p *VirtualNetPlugin) Start() {
 	if len(p.routes) > 0 {
 		routeStr = p.routes[0].String()
 	}
-	xl.Infof("Starting VirtualNetPlugin for visitor [%s], attempting to register routes for %s", p.pluginCtx.Name, routeStr)
+	xl.Infof("starting VirtualNetPlugin for visitor [%s], attempting to register routes for %s", p.pluginCtx.Name, routeStr)
 
 	go p.run()
 }
@@ -101,10 +101,8 @@ func (p *VirtualNetPlugin) run() {
 	reconnectDelay := 10 * time.Second
 
 	for {
-		// Create a signal channel for this connection attempt
 		currentCloseSignal := make(chan struct{})
 
-		// Store the signal channel under lock
 		p.mu.Lock()
 		p.closeSignal = currentCloseSignal
 		p.mu.Unlock()
@@ -112,7 +110,6 @@ func (p *VirtualNetPlugin) run() {
 		select {
 		case <-p.ctx.Done():
 			xl.Infof("VirtualNetPlugin run loop for visitor [%s] stopping (context cancelled before pipe creation).", p.pluginCtx.Name)
-			// Ensure controllerConn from previous loop is cleaned up if necessary
 			p.cleanupControllerConn(xl)
 			return
 		default:
@@ -120,65 +117,43 @@ func (p *VirtualNetPlugin) run() {
 
 		controllerConn, pluginConn := net.Pipe()
 
-		// Store controllerConn under lock for cleanup purposes
 		p.mu.Lock()
 		p.controllerConn = controllerConn
 		p.mu.Unlock()
 
-		// Wrap pluginConn using CloseNotifyConn
 		pluginNotifyConn := netutil.WrapCloseNotifyConn(pluginConn, func() {
-			close(currentCloseSignal) // Signal the run loop
+			close(currentCloseSignal) // Signal the run loop on close.
 		})
 
-		xl.Infof("Attempting to register client route for visitor [%s]", p.pluginCtx.Name)
+		xl.Infof("attempting to register client route for visitor [%s]", p.pluginCtx.Name)
-		err := p.pluginCtx.VnetController.RegisterClientRoute(p.ctx, p.pluginCtx.Name, p.routes, controllerConn)
+		p.pluginCtx.VnetController.RegisterClientRoute(p.ctx, p.pluginCtx.Name, p.routes, controllerConn)
-		if err != nil {
+		xl.Infof("successfully registered client route for visitor [%s]. Starting connection handler with CloseNotifyConn.", p.pluginCtx.Name)
-			xl.Errorf("Failed to register client route for visitor [%s]: %v. Retrying after %v", p.pluginCtx.Name, err, reconnectDelay)
-			p.cleanupPipePair(xl, controllerConn, pluginConn) // Close both ends on registration failure
-
-			// Wait before retrying registration, unless context is cancelled
-			select {
-			case <-time.After(reconnectDelay):
-				continue // Retry the loop
-			case <-p.ctx.Done():
-				xl.Infof("VirtualNetPlugin registration retry wait interrupted for visitor [%s]", p.pluginCtx.Name)
-				return // Exit loop if context is cancelled during wait
-			}
-		}
-
-		xl.Infof("Successfully registered client route for visitor [%s]. Starting connection handler with CloseNotifyConn.", p.pluginCtx.Name)
 
 		// Pass the CloseNotifyConn to HandleConn.
 		// HandleConn is responsible for calling Close() on pluginNotifyConn.
 		p.pluginCtx.HandleConn(pluginNotifyConn)
 
-		// Wait for either the plugin context to be cancelled or the wrapper's Close() to be called via the signal channel.
+		// Wait for context cancellation or connection close.
 		select {
 		case <-p.ctx.Done():
 			xl.Infof("VirtualNetPlugin run loop stopping for visitor [%s] (context cancelled while waiting).", p.pluginCtx.Name)
-			// Context cancelled, ensure controller side is closed if HandleConn didn't close its side yet.
 			p.cleanupControllerConn(xl)
 			return
 		case <-currentCloseSignal:
-			xl.Infof("Detected connection closed via CloseNotifyConn for visitor [%s].", p.pluginCtx.Name)
+			xl.Infof("detected connection closed via CloseNotifyConn for visitor [%s].", p.pluginCtx.Name)
-			// HandleConn closed the plugin side (pluginNotifyConn). The closeFn was called, closing currentCloseSignal.
+			// HandleConn closed the plugin side. Close the controller side.
-			// We still need to close the controller side.
 			p.cleanupControllerConn(xl)
 
-			// Add a delay before attempting to reconnect, respecting context cancellation.
+			xl.Infof("waiting %v before attempting reconnection for visitor [%s]...", reconnectDelay, p.pluginCtx.Name)
-			xl.Infof("Waiting %v before attempting reconnection for visitor [%s]...", reconnectDelay, p.pluginCtx.Name)
 			select {
 			case <-time.After(reconnectDelay):
-				// Delay completed, loop will continue.
 			case <-p.ctx.Done():
 				xl.Infof("VirtualNetPlugin reconnection delay interrupted for visitor [%s]", p.pluginCtx.Name)
-				return // Exit loop if context is cancelled during wait
+				return
 			}
-			// Loop will continue to reconnect.
 		}
 
-		// Loop will restart, context check at the beginning of the loop is sufficient.
+		xl.Infof("re-establishing virtual connection for visitor [%s]...", p.pluginCtx.Name)
-		xl.Infof("Re-establishing virtual connection for visitor [%s]...", p.pluginCtx.Name)
 	}
 }
 
@@ -187,46 +162,31 @@ func (p *VirtualNetPlugin) cleanupControllerConn(xl *xlog.Logger) {
 	p.mu.Lock()
 	defer p.mu.Unlock()
 	if p.controllerConn != nil {
-		xl.Debugf("Cleaning up controllerConn for visitor [%s]", p.pluginCtx.Name)
+		xl.Debugf("cleaning up controllerConn for visitor [%s]", p.pluginCtx.Name)
 		p.controllerConn.Close()
 		p.controllerConn = nil
 	}
-	// Also clear the closeSignal reference for the completed/cancelled connection attempt
 	p.closeSignal = nil
 }
 
-// cleanupPipePair closes both ends of a pipe, used typically when registration fails.
-func (p *VirtualNetPlugin) cleanupPipePair(xl *xlog.Logger, controllerConn, pluginConn net.Conn) {
-	xl.Debugf("Cleaning up pipe pair for visitor [%s] after registration failure", p.pluginCtx.Name)
-	controllerConn.Close()
-	pluginConn.Close()
-	p.mu.Lock()
-	p.controllerConn = nil // Ensure field is nil if it was briefly set
-	p.closeSignal = nil    // Ensure field is nil if it was briefly set
-	p.mu.Unlock()
-}
-
 // Close initiates the plugin shutdown.
 func (p *VirtualNetPlugin) Close() error {
-	xl := xlog.FromContextSafe(p.pluginCtx.Ctx) // Use base context for close logging
+	xl := xlog.FromContextSafe(p.pluginCtx.Ctx)
-	xl.Infof("Closing VirtualNetPlugin for visitor [%s]", p.pluginCtx.Name)
+	xl.Infof("closing VirtualNetPlugin for visitor [%s]", p.pluginCtx.Name)
 
-	// 1. Signal the run loop goroutine to stop via context cancellation.
+	// Signal the run loop goroutine to stop.
 	p.cancel()
 
-	// 2. Unregister the route from the controller.
+	// Unregister the route from the controller.
-	// This might implicitly cause the VnetController to close its end of the pipe (controllerConn).
 	if p.pluginCtx.VnetController != nil {
 		p.pluginCtx.VnetController.UnregisterClientRoute(p.pluginCtx.Name)
-		xl.Infof("Unregistered client route for visitor [%s]", p.pluginCtx.Name)
+		xl.Infof("unregistered client route for visitor [%s]", p.pluginCtx.Name)
-	} else {
-		xl.Warnf("VnetController is nil during close for visitor [%s], cannot unregister route", p.pluginCtx.Name)
 	}
 
-	// 3. Explicitly close the controller side of the pipe managed by this plugin.
+	// Explicitly close the controller side of the pipe.
 	// This ensures the pipe is broken even if the run loop is stuck or HandleConn hasn't closed its end.
 	p.cleanupControllerConn(xl)
-	xl.Infof("Finished cleaning up connections during close for visitor [%s]", p.pluginCtx.Name)
+	xl.Infof("finished cleaning up connections during close for visitor [%s]", p.pluginCtx.Name)
 
 	return nil
 }

pkg/util/vhost/http.go

@@ -162,7 +162,7 @@ func (rp *HTTPReverseProxy) UnRegister(routeCfg RouteConfig) {
 func (rp *HTTPReverseProxy) GetRouteConfig(domain, location, routeByHTTPUser string) *RouteConfig {
 	vr, ok := rp.getVhost(domain, location, routeByHTTPUser)
 	if ok {
-		log.Debugf("get new HTTP request host [%s] path [%s] httpuser [%s]", domain, location, routeByHTTPUser)
+		log.Debugf("get new http request host [%s] path [%s] httpuser [%s]", domain, location, routeByHTTPUser)
 		return vr.payload.(*RouteConfig)
 	}
 	return nil

pkg/util/vhost/vhost.go

@@ -275,7 +275,7 @@ func (l *Listener) Accept() (net.Conn, error) {
 	xl := xlog.FromContextSafe(l.ctx)
 	conn, ok := <-l.accept
 	if !ok {
-		return nil, fmt.Errorf("Listener closed")
+		return nil, fmt.Errorf("listener closed")
 	}
 
 	// if rewriteHost func is exist

pkg/vnet/controller.go

@@ -87,7 +87,7 @@ func (c *Controller) handlePacket(buf []byte) {
 	case waterutil.IsIPv4(buf):
 		header, err := ipv4.ParseHeader(buf)
 		if err != nil {
-			log.Warnf("parse ipv4 header error:", err)
+			log.Warnf("parse ipv4 header error: %v", err)
 			return
 		}
 		src = header.Src
@@ -98,7 +98,7 @@ func (c *Controller) handlePacket(buf []byte) {
 	case waterutil.IsIPv6(buf):
 		header, err := ipv6.ParseHeader(buf)
 		if err != nil {
-			log.Warnf("parse ipv6 header error:", err)
+			log.Warnf("parse ipv6 header error: %v", err)
 			return
 		}
 		src = header.Src
@@ -137,6 +137,12 @@ func (c *Controller) Stop() error {
 // Client connection read loop
 func (c *Controller) readLoopClient(ctx context.Context, conn io.ReadWriteCloser) {
 	xl := xlog.FromContextSafe(ctx)
+	defer func() {
+		// Remove the route when read loop ends (connection closed)
+		c.clientRouter.removeConnRoute(conn)
+		conn.Close()
+	}()
+
 	for {
 		data, err := ReadMessage(conn)
 		if err != nil {
@@ -181,8 +187,18 @@ func (c *Controller) readLoopClient(ctx context.Context, conn io.ReadWriteCloser
 }
 
 // Server connection read loop
-func (c *Controller) readLoopServer(ctx context.Context, conn io.ReadWriteCloser) {
+func (c *Controller) readLoopServer(ctx context.Context, conn io.ReadWriteCloser, onClose func()) {
 	xl := xlog.FromContextSafe(ctx)
+	defer func() {
+		// Clean up all IP mappings associated with this connection when it closes
+		c.serverRouter.cleanupConnIPs(conn)
+		// Call the provided callback upon closure
+		if onClose != nil {
+			onClose()
+		}
+		conn.Close()
+	}()
+
 	for {
 		data, err := ReadMessage(conn)
 		if err != nil {
@@ -220,27 +236,11 @@ func (c *Controller) readLoopServer(ctx context.Context, conn io.ReadWriteCloser
 	}
 }
 
-// RegisterClientRoute Register client route (based on destination IP CIDR)
+// RegisterClientRoute registers a client route (based on destination IP CIDR)
-func (c *Controller) RegisterClientRoute(ctx context.Context, name string, routes []net.IPNet, conn io.ReadWriteCloser) error {
+// and starts the read loop
-	if err := c.clientRouter.addRoute(name, routes, conn); err != nil {
+func (c *Controller) RegisterClientRoute(ctx context.Context, name string, routes []net.IPNet, conn io.ReadWriteCloser) {
-		return err
+	c.clientRouter.addRoute(name, routes, conn)
-	}
 	go c.readLoopClient(ctx, conn)
-	return nil
-}
-
-// RegisterServerConn Register server connection (dynamically associates with source IPs)
-func (c *Controller) RegisterServerConn(ctx context.Context, name string, conn io.ReadWriteCloser) error {
-	if err := c.serverRouter.addConn(name, conn); err != nil {
-		return err
-	}
-	go c.readLoopServer(ctx, conn)
-	return nil
-}
-
-// UnregisterServerConn Remove server connection from routing table
-func (c *Controller) UnregisterServerConn(name string) {
-	c.serverRouter.delConn(name)
 }
 
 // UnregisterClientRoute Remove client route from routing table
@@ -248,6 +248,12 @@ func (c *Controller) UnregisterClientRoute(name string) {
 	c.clientRouter.delRoute(name)
 }
 
+// StartServerConnReadLoop starts the read loop for a server connection
+// (dynamically associates with source IPs)
+func (c *Controller) StartServerConnReadLoop(ctx context.Context, conn io.ReadWriteCloser, onClose func()) {
+	go c.readLoopServer(ctx, conn, onClose)
+}
+
 // ParseRoutes Convert route strings to IPNet objects
 func ParseRoutes(routeStrings []string) ([]net.IPNet, error) {
 	routes := make([]net.IPNet, 0, len(routeStrings))
@@ -273,7 +279,7 @@ func newClientRouter() *clientRouter {
 	}
 }
 
-func (r *clientRouter) addRoute(name string, routes []net.IPNet, conn io.ReadWriteCloser) error {
+func (r *clientRouter) addRoute(name string, routes []net.IPNet, conn io.ReadWriteCloser) {
 	r.mu.Lock()
 	defer r.mu.Unlock()
 	r.routes[name] = &routeElement{
@@ -281,7 +287,6 @@ func (r *clientRouter) addRoute(name string, routes []net.IPNet, conn io.ReadWri
 		routes: routes,
 		conn:   conn,
 	}
-	return nil
 }
 
 func (r *clientRouter) findConn(dst net.IP) (io.Writer, error) {
@@ -303,32 +308,29 @@ func (r *clientRouter) delRoute(name string) {
 	delete(r.routes, name)
 }
 
-// Server router (based on source IP routing)
+func (r *clientRouter) removeConnRoute(conn io.Writer) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	for name, re := range r.routes {
+		if re.conn == conn {
+			delete(r.routes, name)
+			return
+		}
+	}
+}
+
+// Server router (based solely on source IP routing)
 type serverRouter struct {
-	namedConns map[string]io.ReadWriteCloser // Name to connection mapping
+	srcIPConns map[string]io.Writer // Source IP string to connection mapping
-	srcIPConns map[string]io.Writer          // Source IP string to connection mapping
 	mu         sync.RWMutex
 }
 
 func newServerRouter() *serverRouter {
 	return &serverRouter{
-		namedConns: make(map[string]io.ReadWriteCloser),
 		srcIPConns: make(map[string]io.Writer),
 	}
 }
 
-func (r *serverRouter) addConn(name string, conn io.ReadWriteCloser) error {
-	r.mu.Lock()
-	original, ok := r.namedConns[name]
-	r.namedConns[name] = conn
-	r.mu.Unlock()
-	if ok {
-		// Close the original connection if it exists
-		_ = original.Close()
-	}
-	return nil
-}
-
 func (r *serverRouter) findConnBySrc(src net.IP) (io.Writer, error) {
 	r.mu.RLock()
 	defer r.mu.RUnlock()
@@ -340,17 +342,41 @@ func (r *serverRouter) findConnBySrc(src net.IP) (io.Writer, error) {
 }
 
 func (r *serverRouter) registerSrcIP(src net.IP, conn io.Writer) {
+	key := src.String()
+
+	r.mu.RLock()
+	existingConn, ok := r.srcIPConns[key]
+	r.mu.RUnlock()
+
+	// If the entry exists and the connection is the same, no need to do anything.
+	if ok && existingConn == conn {
+		return
+	}
+
+	// Acquire write lock to update the map.
 	r.mu.Lock()
 	defer r.mu.Unlock()
-	r.srcIPConns[src.String()] = conn
+
+	// Double-check after acquiring the write lock to handle potential race conditions.
+	existingConn, ok = r.srcIPConns[key]
+	if ok && existingConn == conn {
+		return
+	}
+
+	r.srcIPConns[key] = conn
 }
 
-func (r *serverRouter) delConn(name string) {
+// cleanupConnIPs removes all IP mappings associated with the specified connection
+func (r *serverRouter) cleanupConnIPs(conn io.Writer) {
 	r.mu.Lock()
 	defer r.mu.Unlock()
-	delete(r.namedConns, name)
+
-	// Note: We don't delete mappings from srcIPConns because we don't know which source IPs are associated with this connection
+	// Find and delete all IP mappings pointing to this connection
-	// This might cause dangling references, but they will be overwritten on new connections or restart
+	for ip, mappedConn := range r.srcIPConns {
+		if mappedConn == conn {
+			delete(r.srcIPConns, ip)
+		}
+	}
 }
 
 type routeElement struct {

pkg/vnet/message.go

@@ -33,7 +33,7 @@ func ReadMessage(r io.Reader) ([]byte, error) {
 	var length uint32
 	err := binary.Read(r, binary.LittleEndian, &length)
 	if err != nil {
-		return nil, fmt.Errorf("read message length error: %v", err)
+		return nil, fmt.Errorf("read message length error: %w", err)
 	}
 
 	// Check length to prevent DoS
@@ -48,7 +48,7 @@ func ReadMessage(r io.Reader) ([]byte, error) {
 	data := make([]byte, length)
 	_, err = io.ReadFull(r, data)
 	if err != nil {
-		return nil, fmt.Errorf("read message data error: %v", err)
+		return nil, fmt.Errorf("read message data error: %w", err)
 	}
 
 	return data, nil
@@ -68,13 +68,13 @@ func WriteMessage(w io.Writer, data []byte) error {
 	// Write length
 	err := binary.Write(w, binary.LittleEndian, length)
 	if err != nil {
-		return fmt.Errorf("write message length error: %v", err)
+		return fmt.Errorf("write message length error: %w", err)
 	}
 
 	// Write message data
 	_, err = w.Write(data)
 	if err != nil {
-		return fmt.Errorf("write message data error: %v", err)
+		return fmt.Errorf("write message data error: %w", err)
 	}
 
 	return nil

pkg/vnet/tun.go

@@ -23,7 +23,8 @@ import (
 )
 
 const (
-	offset = 16
+	offset            = 16
+	defaultPacketSize = 1420
 )
 
 type TunDevice interface {
@@ -35,20 +36,45 @@ func OpenTun(ctx context.Context, addr string) (TunDevice, error) {
 	if err != nil {
 		return nil, err
 	}
-	return &tunDeviceWrapper{dev: td}, nil
+
+	mtu, err := td.MTU()
+	if err != nil {
+		mtu = defaultPacketSize
+	}
+
+	bufferSize := max(mtu, defaultPacketSize)
+	batchSize := td.BatchSize()
+
+	device := &tunDeviceWrapper{
+		dev:         td,
+		bufferSize:  bufferSize,
+		readBuffers: make([][]byte, batchSize),
+		sizeBuffer:  make([]int, batchSize),
+	}
+
+	for i := range device.readBuffers {
+		device.readBuffers[i] = make([]byte, offset+bufferSize)
+	}
+
+	return device, nil
 }
 
 type tunDeviceWrapper struct {
-	dev tun.Device
+	dev           tun.Device
+	bufferSize    int
+	readBuffers   [][]byte
+	packetBuffers [][]byte
+	sizeBuffer    []int
 }
 
 func (d *tunDeviceWrapper) Read(p []byte) (int, error) {
-	buf := pool.GetBuf(len(p) + offset)
+	if len(d.packetBuffers) > 0 {
-	defer pool.PutBuf(buf)
+		n := copy(p, d.packetBuffers[0])
+		d.packetBuffers = d.packetBuffers[1:]
+		return n, nil
+	}
 
-	sz := make([]int, 1)
+	n, err := d.dev.Read(d.readBuffers, d.sizeBuffer, offset)
-
-	n, err := d.dev.Read([][]byte{buf}, sz, offset)
 	if err != nil {
 		return 0, err
 	}
@@ -56,20 +82,26 @@ func (d *tunDeviceWrapper) Read(p []byte) (int, error) {
 		return 0, io.EOF
 	}
 
-	dataSize := sz[0]
+	for i := range n {
-	if dataSize > len(p) {
+		if d.sizeBuffer[i] <= 0 {
-		dataSize = len(p)
+			continue
+		}
+		d.packetBuffers = append(d.packetBuffers, d.readBuffers[i][offset:offset+d.sizeBuffer[i]])
 	}
-	copy(p, buf[offset:offset+dataSize])
+
+	dataSize := copy(p, d.packetBuffers[0])
+	d.packetBuffers = d.packetBuffers[1:]
+
 	return dataSize, nil
 }
 
 func (d *tunDeviceWrapper) Write(p []byte) (int, error) {
-	buf := pool.GetBuf(len(p) + offset)
+	buf := pool.GetBuf(offset + d.bufferSize)
 	defer pool.PutBuf(buf)
 
-	copy(buf[offset:], p)
+	n := copy(buf[offset:], p)
-	return d.dev.Write([][]byte{buf}, offset)
+	_, err := d.dev.Write([][]byte{buf[:offset+n]}, offset)
+	return n, err
 }
 
 func (d *tunDeviceWrapper) Close() error {

pkg/vnet/tun_linux.go

@@ -16,35 +16,44 @@ package vnet
 
 import (
 	"context"
+	"crypto/sha256"
+	"encoding/hex"
 	"fmt"
 	"net"
+	"strconv"
+	"strings"
 
 	"github.com/vishvananda/netlink"
 	"golang.zx2c4.com/wireguard/tun"
 )
 
 const (
-	defaultTunName = "utun"
+	baseTunName = "utun"
-	defaultMTU     = 1420
+	defaultMTU  = 1420
 )
 
 func openTun(_ context.Context, addr string) (tun.Device, error) {
-	dev, err := tun.CreateTUN(defaultTunName, defaultMTU)
+	name, err := findNextTunName(baseTunName)
+	if err != nil {
+		name = getFallbackTunName(baseTunName, addr)
+	}
+
+	tunDevice, err := tun.CreateTUN(name, defaultMTU)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create TUN device '%s': %w", name, err)
+	}
+
+	actualName, err := tunDevice.Name()
 	if err != nil {
 		return nil, err
 	}
 
-	name, err := dev.Name()
+	ifn, err := net.InterfaceByName(actualName)
 	if err != nil {
 		return nil, err
 	}
 
-	ifn, err := net.InterfaceByName(name)
+	link, err := netlink.LinkByName(actualName)
-	if err != nil {
-		return nil, err
-	}
-
-	link, err := netlink.LinkByName(name)
 	if err != nil {
 		return nil, err
 	}
@@ -69,7 +78,34 @@ func openTun(_ context.Context, addr string) (tun.Device, error) {
 	if err = addRoutes(ifn, cidr); err != nil {
 		return nil, err
 	}
-	return dev, nil
+	return tunDevice, nil
+}
+
+func findNextTunName(basename string) (string, error) {
+	interfaces, err := net.Interfaces()
+	if err != nil {
+		return "", fmt.Errorf("failed to get network interfaces: %w", err)
+	}
+	maxSuffix := -1
+
+	for _, iface := range interfaces {
+		name := iface.Name
+		if strings.HasPrefix(name, basename) {
+			suffix := name[len(basename):]
+			if suffix == "" {
+				continue
+			}
+
+			numSuffix, err := strconv.Atoi(suffix)
+			if err == nil && numSuffix > maxSuffix {
+				maxSuffix = numSuffix
+			}
+		}
+	}
+
+	nextSuffix := maxSuffix + 1
+	name := fmt.Sprintf("%s%d", basename, nextSuffix)
+	return name, nil
 }
 
 func addRoutes(ifn *net.Interface, cidr *net.IPNet) error {
@@ -82,3 +118,14 @@ func addRoutes(ifn *net.Interface, cidr *net.IPNet) error {
 	}
 	return nil
 }
+
+// getFallbackTunName generates a deterministic fallback TUN device name
+// based on the base name and the provided address string using a hash.
+func getFallbackTunName(baseName, addr string) string {
+	hasher := sha256.New()
+	hasher.Write([]byte(addr))
+	hashBytes := hasher.Sum(nil)
+	// Use first 4 bytes -> 8 hex chars for brevity, respecting IFNAMSIZ limit.
+	shortHash := hex.EncodeToString(hashBytes[:4])
+	return fmt.Sprintf("%s%s", baseName, shortHash)
+}

server/control.go

@@ -224,7 +224,7 @@ func (ctl *Control) Close() error {
 
 func (ctl *Control) Replaced(newCtl *Control) {
 	xl := ctl.xl
-	xl.Infof("Replaced by client [%s]", newCtl.runID)
+	xl.Infof("replaced by client [%s]", newCtl.runID)
 	ctl.runID = ""
 	ctl.conn.Close()
 }

server/dashboard_api.go

@@ -97,14 +97,14 @@ func (svr *Service) healthz(w http.ResponseWriter, _ *http.Request) {
 func (svr *Service) apiServerInfo(w http.ResponseWriter, r *http.Request) {
 	res := GeneralResponse{Code: 200}
 	defer func() {
-		log.Infof("Http response [%s]: code [%d]", r.URL.Path, res.Code)
+		log.Infof("http response [%s]: code [%d]", r.URL.Path, res.Code)
 		w.WriteHeader(res.Code)
 		if len(res.Msg) > 0 {
 			_, _ = w.Write([]byte(res.Msg))
 		}
 	}()
 
-	log.Infof("Http request: [%s]", r.URL.Path)
+	log.Infof("http request: [%s]", r.URL.Path)
 	serverStats := mem.StatsCollector.GetServer()
 	svrResp := serverInfoResp{
 		Version:               version.Full(),
@@ -218,13 +218,13 @@ func (svr *Service) apiProxyByType(w http.ResponseWriter, r *http.Request) {
 	proxyType := params["type"]
 
 	defer func() {
-		log.Infof("Http response [%s]: code [%d]", r.URL.Path, res.Code)
+		log.Infof("http response [%s]: code [%d]", r.URL.Path, res.Code)
 		w.WriteHeader(res.Code)
 		if len(res.Msg) > 0 {
 			_, _ = w.Write([]byte(res.Msg))
 		}
 	}()
-	log.Infof("Http request: [%s]", r.URL.Path)
+	log.Infof("http request: [%s]", r.URL.Path)
 
 	proxyInfoResp := GetProxyInfoResp{}
 	proxyInfoResp.Proxies = svr.getProxyStatsByType(proxyType)
@@ -290,13 +290,13 @@ func (svr *Service) apiProxyByTypeAndName(w http.ResponseWriter, r *http.Request
 	name := params["name"]
 
 	defer func() {
-		log.Infof("Http response [%s]: code [%d]", r.URL.Path, res.Code)
+		log.Infof("http response [%s]: code [%d]", r.URL.Path, res.Code)
 		w.WriteHeader(res.Code)
 		if len(res.Msg) > 0 {
 			_, _ = w.Write([]byte(res.Msg))
 		}
 	}()
-	log.Infof("Http request: [%s]", r.URL.Path)
+	log.Infof("http request: [%s]", r.URL.Path)
 
 	var proxyStatsResp GetProxyStatsResp
 	proxyStatsResp, res.Code, res.Msg = svr.getProxyStatsByTypeAndName(proxyType, name)
@@ -358,13 +358,13 @@ func (svr *Service) apiProxyTraffic(w http.ResponseWriter, r *http.Request) {
 	name := params["name"]
 
 	defer func() {
-		log.Infof("Http response [%s]: code [%d]", r.URL.Path, res.Code)
+		log.Infof("http response [%s]: code [%d]", r.URL.Path, res.Code)
 		w.WriteHeader(res.Code)
 		if len(res.Msg) > 0 {
 			_, _ = w.Write([]byte(res.Msg))
 		}
 	}()
-	log.Infof("Http request: [%s]", r.URL.Path)
+	log.Infof("http request: [%s]", r.URL.Path)
 
 	trafficResp := GetProxyTrafficResp{}
 	trafficResp.Name = name
@@ -386,9 +386,9 @@ func (svr *Service) apiProxyTraffic(w http.ResponseWriter, r *http.Request) {
 func (svr *Service) deleteProxies(w http.ResponseWriter, r *http.Request) {
 	res := GeneralResponse{Code: 200}
 
-	log.Infof("Http request: [%s]", r.URL.Path)
+	log.Infof("http request: [%s]", r.URL.Path)
 	defer func() {
-		log.Infof("Http response [%s]: code [%d]", r.URL.Path, res.Code)
+		log.Infof("http response [%s]: code [%d]", r.URL.Path, res.Code)
 		w.WriteHeader(res.Code)
 		if len(res.Msg) > 0 {
 			_, _ = w.Write([]byte(res.Msg))

server/service.go

@@ -427,7 +427,7 @@ func (svr *Service) handleConnection(ctx context.Context, conn net.Conn, interna
 
 	_ = conn.SetReadDeadline(time.Now().Add(connReadTimeout))
 	if rawMsg, err = msg.ReadMsg(conn); err != nil {
-		log.Tracef("Failed to read message: %v", err)
+		log.Tracef("failed to read message: %v", err)
 		conn.Close()
 		return
 	}
@@ -475,7 +475,7 @@ func (svr *Service) handleConnection(ctx context.Context, conn net.Conn, interna
 			})
 		}
 	default:
-		log.Warnf("Error message type for the new connection [%s]", conn.RemoteAddr().String())
+		log.Warnf("error message type for the new connection [%s]", conn.RemoteAddr().String())
 		conn.Close()
 	}
 }
@@ -488,7 +488,7 @@ func (svr *Service) HandleListener(l net.Listener, internal bool) {
 	for {
 		c, err := l.Accept()
 		if err != nil {
-			log.Warnf("Listener for incoming connections from client closed")
+			log.Warnf("listener for incoming connections from client closed")
 			return
 		}
 		// inject xlog object into net.Conn context
@@ -504,7 +504,7 @@ func (svr *Service) HandleListener(l net.Listener, internal bool) {
 			var isTLS, custom bool
 			c, isTLS, custom, err = netpkg.CheckAndEnableTLSServerConnWithTimeout(c, svr.tlsConfig, forceTLS, connReadTimeout)
 			if err != nil {
-				log.Warnf("CheckAndEnableTLSServerConnWithTimeout error: %v", err)
+				log.Warnf("checkAndEnableTLSServerConnWithTimeout error: %v", err)
 				originConn.Close()
 				continue
 			}
@@ -520,7 +520,7 @@ func (svr *Service) HandleListener(l net.Listener, internal bool) {
 				fmuxCfg.MaxStreamWindowSize = 6 * 1024 * 1024
 				session, err := fmux.Server(frpConn, fmuxCfg)
 				if err != nil {
-					log.Warnf("Failed to create mux connection: %v", err)
+					log.Warnf("failed to create mux connection: %v", err)
 					frpConn.Close()
 					return
 				}
@@ -528,7 +528,7 @@ func (svr *Service) HandleListener(l net.Listener, internal bool) {
 				for {
 					stream, err := session.AcceptStream()
 					if err != nil {
-						log.Debugf("Accept new mux stream error: %v", err)
+						log.Debugf("accept new mux stream error: %v", err)
 						session.Close()
 						return
 					}
@@ -546,7 +546,7 @@ func (svr *Service) HandleQUICListener(l *quic.Listener) {
 	for {
 		c, err := l.Accept(context.Background())
 		if err != nil {
-			log.Warnf("QUICListener for incoming connections from client closed")
+			log.Warnf("quic listener for incoming connections from client closed")
 			return
 		}
 		// Start a new goroutine to handle connection.
@@ -554,7 +554,7 @@ func (svr *Service) HandleQUICListener(l *quic.Listener) {
 			for {
 				stream, err := frpConn.AcceptStream(context.Background())
 				if err != nil {
-					log.Debugf("Accept new quic mux stream error: %v", err)
+					log.Debugf("accept new quic mux stream error: %v", err)
 					_ = frpConn.CloseWithError(0, "")
 					return
 				}
@@ -620,7 +620,7 @@ func (svr *Service) RegisterWorkConn(workConn net.Conn, newMsg *msg.NewWorkConn)
 	xl := netpkg.NewLogFromConn(workConn)
 	ctl, exist := svr.ctlManager.GetByID(newMsg.RunID)
 	if !exist {
-		xl.Warnf("No client control found for run id [%s]", newMsg.RunID)
+		xl.Warnf("no client control found for run id [%s]", newMsg.RunID)
 		return fmt.Errorf("no client control found for run id [%s]", newMsg.RunID)
 	}
 	// server plugin hook

test/e2e/e2e.go

@@ -38,7 +38,7 @@ func RunE2ETests(t *testing.T) {
 	// Randomize specs as well as suites
 	suiteConfig.RandomizeAllSpecs = true
 
-	log.Infof("Starting e2e run %q on Ginkgo node %d of total %d",
+	log.Infof("starting e2e run %q on Ginkgo node %d of total %d",
 		framework.RunID, suiteConfig.ParallelProcess, suiteConfig.ParallelTotal)
 	ginkgo.RunSpecs(t, "frp e2e suite", suiteConfig, reporterConfig)
 }

test/e2e/framework/request.go

@@ -20,7 +20,7 @@ func ExpectResponseCode(code int) EnsureFunc {
 		if resp.Code == code {
 			return true
 		}
-		flog.Warnf("Expect code %d, but got %d", code, resp.Code)
+		flog.Warnf("expect code %d, but got %d", code, resp.Code)
 		return false
 	}
 }
@@ -111,14 +111,14 @@ func (e *RequestExpect) Ensure(fns ...EnsureFunc) {
 
 	if len(fns) == 0 {
 		if !bytes.Equal(e.expectResp, ret.Content) {
-			flog.Tracef("Response info: %+v", ret)
+			flog.Tracef("response info: %+v", ret)
 		}
 		ExpectEqualValuesWithOffset(1, string(ret.Content), string(e.expectResp), e.explain...)
 	} else {
 		for _, fn := range fns {
 			ok := fn(ret)
 			if !ok {
-				flog.Tracef("Response info: %+v", ret)
+				flog.Tracef("response info: %+v", ret)
 			}
 			ExpectTrueWithOffset(1, ok, e.explain...)
 		}

test/e2e/legacy/features/real_ip.go

@@ -93,7 +93,7 @@ var _ = ginkgo.Describe("[Feature: Real IP]", func() {
 			f.RunProcesses([]string{serverConf}, []string{clientConf})
 
 			framework.NewRequestExpect(f).Port(remotePort).Ensure(func(resp *request.Response) bool {
-				log.Tracef("ProxyProtocol get SourceAddr: %s", string(resp.Content))
+				log.Tracef("proxy protocol get SourceAddr: %s", string(resp.Content))
 				addr, err := net.ResolveTCPAddr("tcp", string(resp.Content))
 				if err != nil {
 					return false
@@ -142,7 +142,7 @@ var _ = ginkgo.Describe("[Feature: Real IP]", func() {
 				r.HTTP().HTTPHost("normal.example.com")
 			}).Ensure(framework.ExpectResponseCode(404))
 
-			log.Tracef("ProxyProtocol get SourceAddr: %s", srcAddrRecord)
+			log.Tracef("proxy protocol get SourceAddr: %s", srcAddrRecord)
 			addr, err := net.ResolveTCPAddr("tcp", srcAddrRecord)
 			framework.ExpectNoError(err, srcAddrRecord)
 			framework.ExpectEqualValues("127.0.0.1", addr.IP.String())

test/e2e/v1/features/real_ip.go

@@ -215,7 +215,7 @@ var _ = ginkgo.Describe("[Feature: Real IP]", func() {
 			f.RunProcesses([]string{serverConf}, []string{clientConf})
 
 			framework.NewRequestExpect(f).Port(remotePort).Ensure(func(resp *request.Response) bool {
-				log.Tracef("ProxyProtocol get SourceAddr: %s", string(resp.Content))
+				log.Tracef("proxy protocol get SourceAddr: %s", string(resp.Content))
 				addr, err := net.ResolveTCPAddr("tcp", string(resp.Content))
 				if err != nil {
 					return false
@@ -265,7 +265,7 @@ var _ = ginkgo.Describe("[Feature: Real IP]", func() {
 				r.HTTP().HTTPHost("normal.example.com")
 			}).Ensure(framework.ExpectResponseCode(404))
 
-			log.Tracef("ProxyProtocol get SourceAddr: %s", srcAddrRecord)
+			log.Tracef("proxy protocol get SourceAddr: %s", srcAddrRecord)
 			addr, err := net.ResolveTCPAddr("tcp", srcAddrRecord)
 			framework.ExpectNoError(err, srcAddrRecord)
 			framework.ExpectEqualValues("127.0.0.1", addr.IP.String())