Replace "only" with "xudpConcurrency" in Mux config

app/proxyman/config.pb.go

@@ -594,9 +594,9 @@ type MultiplexingConfig struct {
 	// Whether or not Mux is enabled.
 	Enabled bool `protobuf:"varint,1,opt,name=enabled,proto3" json:"enabled,omitempty"`
 	// Max number of concurrent connections that one Mux connection can handle.
-	Concurrency uint32 `protobuf:"varint,2,opt,name=concurrency,proto3" json:"concurrency,omitempty"`
+	Concurrency int32 `protobuf:"varint,2,opt,name=concurrency,proto3" json:"concurrency,omitempty"`
-	// Both(0), TCP(net.Network_TCP), UDP(net.Network_UDP).
+	// Transport XUDP in another Mux.
-	Only uint32 `protobuf:"varint,3,opt,name=only,proto3" json:"only,omitempty"`
+	XudpConcurrency int32 `protobuf:"varint,3,opt,name=xudpConcurrency,proto3" json:"xudpConcurrency,omitempty"`
 }
 
 func (x *MultiplexingConfig) Reset() {
@@ -638,16 +638,16 @@ func (x *MultiplexingConfig) GetEnabled() bool {
 	return false
 }
 
-func (x *MultiplexingConfig) GetConcurrency() uint32 {
+func (x *MultiplexingConfig) GetConcurrency() int32 {
 	if x != nil {
 		return x.Concurrency
 	}
 	return 0
 }
 
-func (x *MultiplexingConfig) GetOnly() uint32 {
+func (x *MultiplexingConfig) GetXudpConcurrency() int32 {
 	if x != nil {
-		return x.Only
+		return x.XudpConcurrency
 	}
 	return 0
 }
@@ -865,22 +865,23 @@ var file_app_proxyman_config_proto_rawDesc = []byte{
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-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
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+	0x79, 0x6d, 0x61, 0x6e, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (

app/proxyman/config.proto

@@ -97,7 +97,7 @@ message MultiplexingConfig {
   // Whether or not Mux is enabled.
   bool enabled = 1;
   // Max number of concurrent connections that one Mux connection can handle.
-  uint32 concurrency = 2;
+  int32 concurrency = 2;
-  // Both(0), TCP(net.Network_TCP), UDP(net.Network_UDP).
+  // Transport XUDP in another Mux.
-  uint32 only = 3;
+  int32 xudpConcurrency = 3;
 }

app/proxyman/outbound/handler.go

@@ -57,6 +57,7 @@ type Handler struct {
 	proxy           proxy.Outbound
 	outboundManager outbound.Manager
 	mux             *mux.ClientManager
+	xudp            *mux.ClientManager
 	uplinkCounter   stats.Counter
 	downlinkCounter stats.Counter
 }
@@ -106,23 +107,49 @@ func NewHandler(ctx context.Context, config *core.OutboundHandlerConfig) (outbou
 	}
 
 	if h.senderSettings != nil && h.senderSettings.MultiplexSettings != nil {
-		config := h.senderSettings.MultiplexSettings
+		if config := h.senderSettings.MultiplexSettings; config.Enabled {
-		if config.Concurrency < 1 || config.Concurrency > 1024 {
+			if config.Concurrency < 0 {
-			return nil, newError("invalid mux concurrency: ", config.Concurrency).AtWarning()
+				h.mux = &mux.ClientManager{Enabled: false}
 			}
+			if config.Concurrency == 0 {
+				config.Concurrency = 8 // same as before
+			}
+			if config.Concurrency > 0 {
 				h.mux = &mux.ClientManager{
-			Enabled: config.Enabled,
+					Enabled: true,
 					Picker: &mux.IncrementalWorkerPicker{
 						Factory: &mux.DialingWorkerFactory{
 							Proxy:  proxyHandler,
 							Dialer: h,
 							Strategy: mux.ClientStrategy{
-						MaxConcurrency: config.Concurrency,
+								MaxConcurrency: uint32(config.Concurrency),
 								MaxConnection:  128,
 							},
 						},
 					},
-			Only: config.Only,
+				}
+			}
+			if config.XudpConcurrency < 0 {
+				h.xudp = &mux.ClientManager{Enabled: false}
+			}
+			if config.XudpConcurrency == 0 {
+				h.xudp = nil // same as before
+			}
+			if config.XudpConcurrency > 0 {
+				h.xudp = &mux.ClientManager{
+					Enabled: true,
+					Picker: &mux.IncrementalWorkerPicker{
+						Factory: &mux.DialingWorkerFactory{
+							Proxy:  proxyHandler,
+							Dialer: h,
+							Strategy: mux.ClientStrategy{
+								MaxConcurrency: uint32(config.XudpConcurrency),
+								MaxConnection:  128,
+							},
+						},
+					},
+				}
+			}
 		}
 	}
 
@@ -137,16 +164,28 @@ func (h *Handler) Tag() string {
 
 // Dispatch implements proxy.Outbound.Dispatch.
 func (h *Handler) Dispatch(ctx context.Context, link *transport.Link) {
-	outbound := session.OutboundFromContext(ctx)
+	if h.mux != nil {
-	if h.mux != nil && (h.mux.Enabled || session.MuxPreferedFromContext(ctx)) &&
+		test := func(err error) {
-		(h.mux.Only == 0 || (outbound != nil && h.mux.Only == uint32(outbound.Target.Network))) {
+			if err != nil {
-		if err := h.mux.Dispatch(ctx, link); err != nil {
 				err := newError("failed to process mux outbound traffic").Base(err)
 				session.SubmitOutboundErrorToOriginator(ctx, err)
 				err.WriteToLog(session.ExportIDToError(ctx))
 				common.Interrupt(link.Writer)
 			}
-	} else {
+		}
+		if h.xudp != nil && session.OutboundFromContext(ctx).Target.Network == net.Network_UDP {
+			if !h.xudp.Enabled {
+				goto out
+			}
+			test(h.xudp.Dispatch(ctx, link))
+			return
+		}
+		if h.mux.Enabled {
+			test(h.mux.Dispatch(ctx, link))
+			return
+		}
+	}
+out:
 	err := h.proxy.Process(ctx, link, h)
 	if err != nil {
 		if errors.Is(err, io.EOF) || errors.Is(err, io.ErrClosedPipe) || errors.Is(err, context.Canceled) {
@@ -163,7 +202,6 @@ func (h *Handler) Dispatch(ctx context.Context, link *transport.Link) {
 		common.Must(common.Close(link.Writer))
 	}
 	common.Interrupt(link.Reader)
-	}
 }
 
 // Address implements internet.Dialer.

common/mux/client.go

@@ -24,7 +24,6 @@ import (
 type ClientManager struct {
 	Enabled bool // wheather mux is enabled from user config
 	Picker  WorkerPicker
-	Only    uint32
 }
 
 func (m *ClientManager) Dispatch(ctx context.Context, link *transport.Link) error {

infra/conf/xray.go

@@ -10,7 +10,6 @@ import (
 	"github.com/xtls/xray-core/app/dispatcher"
 	"github.com/xtls/xray-core/app/proxyman"
 	"github.com/xtls/xray-core/app/stats"
-	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/serial"
 	core "github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/transport/internet"
@@ -110,34 +109,16 @@ func (c *SniffingConfig) Build() (*proxyman.SniffingConfig, error) {
 type MuxConfig struct {
 	Enabled         bool  `json:"enabled"`
 	Concurrency     int16 `json:"concurrency"`
-	Only        string `json:"only"`
+	XudpConcurrency int16 `json:"xudpConcurrency"`
 }
 
 // Build creates MultiplexingConfig, Concurrency < 0 completely disables mux.
 func (m *MuxConfig) Build() (*proxyman.MultiplexingConfig, error) {
-	if m.Concurrency < 0 {
+	return &proxyman.MultiplexingConfig{
-		return nil, nil
-	}
-	if m.Concurrency == 0 {
-		m.Concurrency = 8
-	}
-
-	config := &proxyman.MultiplexingConfig{
 		Enabled:         m.Enabled,
-		Concurrency: uint32(m.Concurrency),
+		Concurrency:     int32(m.Concurrency),
-	}
+		XudpConcurrency: int32(m.XudpConcurrency),
-
+	}, nil
-	switch strings.ToLower(m.Only) {
-	case "", "both":
-	case "tcp":
-		config.Only = uint32(net.Network_TCP)
-	case "udp":
-		config.Only = uint32(net.Network_UDP)
-	default:
-		return nil, newError(`unknown "only": `, m.Only)
-	}
-
-	return config, nil
 }
 
 type InboundDetourAllocationConfig struct {

infra/conf/xray_test.go

@@ -345,13 +345,16 @@ func TestMuxConfig_Build(t *testing.T) {
 		}},
 		{"empty def", `{}`, &proxyman.MultiplexingConfig{
 			Enabled:     false,
-			Concurrency: 8,
+			Concurrency: 0,
 		}},
 		{"not enable", `{"enabled": false, "concurrency": 4}`, &proxyman.MultiplexingConfig{
 			Enabled:     false,
 			Concurrency: 4,
 		}},
-		{"forbidden", `{"enabled": false, "concurrency": -1}`, nil},
+		{"forbidden", `{"enabled": false, "concurrency": -1}`, &proxyman.MultiplexingConfig{
+			Enabled:     false,
+			Concurrency: -1,
+		}},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {