optional field in kcp config

transport/config_json.go

@@ -16,9 +16,7 @@ func (this *Config) UnmarshalJSON(data []byte) error {
 		KCPConfig kcp.Config  `json:"kcpSettings"`
 		WSConfig  *ws.Config  `json:"wsSettings"`
 	}
-	jsonConfig := &JsonConfig{
-		KCPConfig: kcp.DefaultConfig(),
-	}
+	jsonConfig := &JsonConfig{}
 	if err := json.Unmarshal(data, jsonConfig); err != nil {
 		return err
 	}

transport/internet/kcp/config.go

@@ -4,6 +4,48 @@ import (
 	"v2ray.com/core/transport/internet"
 )
 
+func (this *MTU) GetValue() uint32 {
+	if this == nil {
+		return 1350
+	}
+	return this.Value
+}
+
+func (this *TTI) GetValue() uint32 {
+	if this == nil {
+		return 50
+	}
+	return this.Value
+}
+
+func (this *UplinkCapacity) GetValue() uint32 {
+	if this == nil {
+		return 5
+	}
+	return this.Value
+}
+
+func (this *DownlinkCapacity) GetValue() uint32 {
+	if this == nil {
+		return 20
+	}
+	return this.Value
+}
+
+func (this *WriteBuffer) GetSize() uint32 {
+	if this == nil {
+		return 1 * 1024 * 1024
+	}
+	return this.Size
+}
+
+func (this *ReadBuffer) GetSize() uint32 {
+	if this == nil {
+		return 1 * 1024 * 1024
+	}
+	return this.Size
+}
+
 func (this *Config) Apply() {
 	effectiveConfig = *this
 }
@@ -21,7 +63,7 @@ func (this *Config) GetAuthenticator() (internet.Authenticator, error) {
 }
 
 func (this *Config) GetSendingInFlightSize() uint32 {
-	size := this.UplinkCapacity * 1024 * 1024 / this.Mtu / (1000 / this.Tti) / 2
+	size := this.UplinkCapacity.GetValue() * 1024 * 1024 / this.Mtu.GetValue() / (1000 / this.Tti.GetValue()) / 2
 	if size < 8 {
 		size = 8
 	}
@@ -29,11 +71,11 @@ func (this *Config) GetSendingInFlightSize() uint32 {
 }
 
 func (this *Config) GetSendingBufferSize() uint32 {
-	return this.GetSendingInFlightSize() + this.WriteBuffer/this.Mtu
+	return this.GetSendingInFlightSize() + this.WriteBuffer.GetSize()/this.Mtu.GetValue()
 }
 
 func (this *Config) GetReceivingInFlightSize() uint32 {
-	size := this.DownlinkCapacity * 1024 * 1024 / this.Mtu / (1000 / this.Tti) / 2
+	size := this.DownlinkCapacity.GetValue() * 1024 * 1024 / this.Mtu.GetValue() / (1000 / this.Tti.GetValue()) / 2
 	if size < 8 {
 		size = 8
 	}
@@ -41,21 +83,9 @@ func (this *Config) GetReceivingInFlightSize() uint32 {
 }
 
 func (this *Config) GetReceivingBufferSize() uint32 {
-	return this.GetReceivingInFlightSize() + this.ReadBuffer/this.Mtu
-}
-
-func DefaultConfig() Config {
-	return Config{
-		Mtu:              1350,
-		Tti:              50,
-		UplinkCapacity:   5,
-		DownlinkCapacity: 20,
-		Congestion:       false,
-		WriteBuffer:      1 * 1024 * 1024,
-		ReadBuffer:       1 * 1024 * 1024,
-	}
+	return this.GetReceivingInFlightSize() + this.ReadBuffer.GetSize()/this.Mtu.GetValue()
 }
 
 var (
-	effectiveConfig = DefaultConfig()
+	effectiveConfig Config
 )

transport/internet/kcp/config.pb.go

@@ -9,6 +9,12 @@ It is generated from these files:
 	v2ray.com/core/transport/internet/kcp/config.proto
 
 It has these top-level messages:
+	MTU
+	TTI
+	UplinkCapacity
+	DownlinkCapacity
+	WriteBuffer
+	ReadBuffer
 	Config
 */
 package kcp
@@ -29,21 +35,117 @@ var _ = math.Inf
 // proto package needs to be updated.
 const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
 
+type MTU struct {
+	Value uint32 `protobuf:"varint,1,opt,name=value" json:"value,omitempty"`
+}
+
+func (m *MTU) Reset()                    { *m = MTU{} }
+func (m *MTU) String() string            { return proto.CompactTextString(m) }
+func (*MTU) ProtoMessage()               {}
+func (*MTU) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
+
+type TTI struct {
+	Value uint32 `protobuf:"varint,1,opt,name=value" json:"value,omitempty"`
+}
+
+func (m *TTI) Reset()                    { *m = TTI{} }
+func (m *TTI) String() string            { return proto.CompactTextString(m) }
+func (*TTI) ProtoMessage()               {}
+func (*TTI) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{1} }
+
+type UplinkCapacity struct {
+	Value uint32 `protobuf:"varint,1,opt,name=value" json:"value,omitempty"`
+}
+
+func (m *UplinkCapacity) Reset()                    { *m = UplinkCapacity{} }
+func (m *UplinkCapacity) String() string            { return proto.CompactTextString(m) }
+func (*UplinkCapacity) ProtoMessage()               {}
+func (*UplinkCapacity) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{2} }
+
+type DownlinkCapacity struct {
+	Value uint32 `protobuf:"varint,1,opt,name=value" json:"value,omitempty"`
+}
+
+func (m *DownlinkCapacity) Reset()                    { *m = DownlinkCapacity{} }
+func (m *DownlinkCapacity) String() string            { return proto.CompactTextString(m) }
+func (*DownlinkCapacity) ProtoMessage()               {}
+func (*DownlinkCapacity) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{3} }
+
+type WriteBuffer struct {
+	Size uint32 `protobuf:"varint,1,opt,name=size" json:"size,omitempty"`
+}
+
+func (m *WriteBuffer) Reset()                    { *m = WriteBuffer{} }
+func (m *WriteBuffer) String() string            { return proto.CompactTextString(m) }
+func (*WriteBuffer) ProtoMessage()               {}
+func (*WriteBuffer) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{4} }
+
+type ReadBuffer struct {
+	Size uint32 `protobuf:"varint,1,opt,name=size" json:"size,omitempty"`
+}
+
+func (m *ReadBuffer) Reset()                    { *m = ReadBuffer{} }
+func (m *ReadBuffer) String() string            { return proto.CompactTextString(m) }
+func (*ReadBuffer) ProtoMessage()               {}
+func (*ReadBuffer) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{5} }
+
 type Config struct {
-	Mtu              uint32                                                 `protobuf:"varint,1,opt,name=mtu" json:"mtu,omitempty"`
-	Tti              uint32                                                 `protobuf:"varint,2,opt,name=tti" json:"tti,omitempty"`
-	UplinkCapacity   uint32                                                 `protobuf:"varint,3,opt,name=uplink_capacity,json=uplinkCapacity" json:"uplink_capacity,omitempty"`
-	DownlinkCapacity uint32                                                 `protobuf:"varint,4,opt,name=downlink_capacity,json=downlinkCapacity" json:"downlink_capacity,omitempty"`
+	Mtu              *MTU                                                   `protobuf:"bytes,1,opt,name=mtu" json:"mtu,omitempty"`
+	Tti              *TTI                                                   `protobuf:"bytes,2,opt,name=tti" json:"tti,omitempty"`
+	UplinkCapacity   *UplinkCapacity                                        `protobuf:"bytes,3,opt,name=uplink_capacity,json=uplinkCapacity" json:"uplink_capacity,omitempty"`
+	DownlinkCapacity *DownlinkCapacity                                      `protobuf:"bytes,4,opt,name=downlink_capacity,json=downlinkCapacity" json:"downlink_capacity,omitempty"`
 	Congestion       bool                                                   `protobuf:"varint,5,opt,name=congestion" json:"congestion,omitempty"`
-	WriteBuffer      uint32                                                 `protobuf:"varint,6,opt,name=write_buffer,json=writeBuffer" json:"write_buffer,omitempty"`
-	ReadBuffer       uint32                                                 `protobuf:"varint,7,opt,name=read_buffer,json=readBuffer" json:"read_buffer,omitempty"`
+	WriteBuffer      *WriteBuffer                                           `protobuf:"bytes,6,opt,name=write_buffer,json=writeBuffer" json:"write_buffer,omitempty"`
+	ReadBuffer       *ReadBuffer                                            `protobuf:"bytes,7,opt,name=read_buffer,json=readBuffer" json:"read_buffer,omitempty"`
 	HeaderConfig     *com_v2ray_core_transport_internet.AuthenticatorConfig `protobuf:"bytes,8,opt,name=header_config,json=headerConfig" json:"header_config,omitempty"`
 }
 
 func (m *Config) Reset()                    { *m = Config{} }
 func (m *Config) String() string            { return proto.CompactTextString(m) }
 func (*Config) ProtoMessage()               {}
-func (*Config) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
+func (*Config) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{6} }
+
+func (m *Config) GetMtu() *MTU {
+	if m != nil {
+		return m.Mtu
+	}
+	return nil
+}
+
+func (m *Config) GetTti() *TTI {
+	if m != nil {
+		return m.Tti
+	}
+	return nil
+}
+
+func (m *Config) GetUplinkCapacity() *UplinkCapacity {
+	if m != nil {
+		return m.UplinkCapacity
+	}
+	return nil
+}
+
+func (m *Config) GetDownlinkCapacity() *DownlinkCapacity {
+	if m != nil {
+		return m.DownlinkCapacity
+	}
+	return nil
+}
+
+func (m *Config) GetWriteBuffer() *WriteBuffer {
+	if m != nil {
+		return m.WriteBuffer
+	}
+	return nil
+}
+
+func (m *Config) GetReadBuffer() *ReadBuffer {
+	if m != nil {
+		return m.ReadBuffer
+	}
+	return nil
+}
 
 func (m *Config) GetHeaderConfig() *com_v2ray_core_transport_internet.AuthenticatorConfig {
 	if m != nil {
@@ -53,30 +155,43 @@ func (m *Config) GetHeaderConfig() *com_v2ray_core_transport_internet.Authentica
 }
 
 func init() {
+	proto.RegisterType((*MTU)(nil), "com.v2ray.core.transport.internet.kcp.MTU")
+	proto.RegisterType((*TTI)(nil), "com.v2ray.core.transport.internet.kcp.TTI")
+	proto.RegisterType((*UplinkCapacity)(nil), "com.v2ray.core.transport.internet.kcp.UplinkCapacity")
+	proto.RegisterType((*DownlinkCapacity)(nil), "com.v2ray.core.transport.internet.kcp.DownlinkCapacity")
+	proto.RegisterType((*WriteBuffer)(nil), "com.v2ray.core.transport.internet.kcp.WriteBuffer")
+	proto.RegisterType((*ReadBuffer)(nil), "com.v2ray.core.transport.internet.kcp.ReadBuffer")
 	proto.RegisterType((*Config)(nil), "com.v2ray.core.transport.internet.kcp.Config")
 }
 
 func init() { proto.RegisterFile("v2ray.com/core/transport/internet/kcp/config.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 290 bytes of a gzipped FileDescriptorProto
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-	0x00, 0x00,
+	// 404 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x94, 0x93, 0xd1, 0xab, 0xda, 0x30,
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+	0xe7, 0x03, 0x00, 0x00,
 }

transport/internet/kcp/config.proto

@@ -5,13 +5,43 @@ option go_package = "kcp";
 
 import "v2ray.com/core/transport/internet/authenticator.proto";
 
+// Maximum Transmission Unit, in bytes.
+message MTU {
+  uint32 value = 1;
+}
+
+// Transmission Time Interview, in milli-sec.
+message TTI {
+  uint32 value = 1;
+}
+
+// Uplink capacity, in MB.
+message UplinkCapacity {
+  uint32 value = 1;
+}
+
+// Downlink capacity, in MB.
+message DownlinkCapacity {
+  uint32 value = 1;
+}
+
+message WriteBuffer {
+  // Buffer size in bytes.
+  uint32 size = 1;
+}
+
+message ReadBuffer {
+  // Buffer size in bytes.
+  uint32 size = 1;
+}
+
 message Config {
-  uint32 mtu = 1;
-  uint32 tti = 2;
-  uint32 uplink_capacity = 3;
-  uint32 downlink_capacity = 4;
+  MTU mtu = 1;
+  TTI tti = 2;
+  UplinkCapacity uplink_capacity = 3;
+  DownlinkCapacity downlink_capacity = 4;
   bool congestion = 5;
-  uint32 write_buffer = 6;
-  uint32 read_buffer = 7;
+  WriteBuffer write_buffer = 6;
+  ReadBuffer read_buffer = 7;
   com.v2ray.core.transport.internet.AuthenticatorConfig header_config = 8;
 }

transport/internet/kcp/config_json.go

@@ -31,7 +31,7 @@ func (this *Config) UnmarshalJSON(data []byte) error {
 			log.Error("KCP|Config: Invalid MTU size: ", mtu)
 			return common.ErrBadConfiguration
 		}
-		this.Mtu = mtu
+		this.Mtu = &MTU{Value: *jsonConfig.Mtu}
 	}
 	if jsonConfig.Tti != nil {
 		tti := *jsonConfig.Tti
@@ -39,13 +39,13 @@ func (this *Config) UnmarshalJSON(data []byte) error {
 			log.Error("KCP|Config: Invalid TTI: ", tti)
 			return common.ErrBadConfiguration
 		}
-		this.Tti = tti
+		this.Tti = &TTI{Value: *jsonConfig.Tti}
 	}
 	if jsonConfig.UpCap != nil {
-		this.UplinkCapacity = *jsonConfig.UpCap
+		this.UplinkCapacity = &UplinkCapacity{Value: *jsonConfig.UpCap}
 	}
 	if jsonConfig.DownCap != nil {
-		this.DownlinkCapacity = *jsonConfig.DownCap
+		this.DownlinkCapacity = &DownlinkCapacity{Value: *jsonConfig.DownCap}
 	}
 	if jsonConfig.Congestion != nil {
 		this.Congestion = *jsonConfig.Congestion
@@ -53,17 +53,17 @@ func (this *Config) UnmarshalJSON(data []byte) error {
 	if jsonConfig.ReadBufferSize != nil {
 		size := *jsonConfig.ReadBufferSize
 		if size > 0 {
-			this.ReadBuffer = size * 1024 * 1024
+			this.ReadBuffer = &ReadBuffer{Size: size * 1024 * 1024}
 		} else {
-			this.ReadBuffer = 512 * 1024
+			this.ReadBuffer = &ReadBuffer{Size: 512 * 1024}
 		}
 	}
 	if jsonConfig.WriteBufferSize != nil {
 		size := *jsonConfig.WriteBufferSize
 		if size > 0 {
-			this.WriteBuffer = size * 1024 * 1024
+			this.WriteBuffer = &WriteBuffer{Size: size * 1024 * 1024}
 		} else {
-			this.WriteBuffer = 512 * 1024
+			this.WriteBuffer = &WriteBuffer{Size: 512 * 1024}
 		}
 	}
 	if len(jsonConfig.HeaderConfig) > 0 {

transport/internet/kcp/connection.go

@@ -171,9 +171,9 @@ func NewConnection(conv uint16, writerCloser io.WriteCloser, local *net.UDPAddr,
 	conn.mss = authWriter.Mtu() - DataSegmentOverhead
 	conn.roundTrip = &RoundTripInfo{
 		rto:    100,
-		minRtt: effectiveConfig.Tti,
+		minRtt: effectiveConfig.Tti.GetValue(),
 	}
-	conn.interval = effectiveConfig.Tti
+	conn.interval = effectiveConfig.Tti.GetValue()
 	conn.receivingWorker = NewReceivingWorker(conn)
 	conn.fastresend = 2
 	conn.congestionControl = effectiveConfig.Congestion
@@ -366,7 +366,7 @@ func (this *Connection) updateTask() {
 	for this.State() != StateTerminated {
 		this.flush()
 
-		interval := time.Duration(effectiveConfig.Tti) * time.Millisecond
+		interval := time.Duration(effectiveConfig.Tti.GetValue()) * time.Millisecond
 		if this.State() == StateTerminating {
 			interval = time.Second
 		}

transport/internet/kcp/output.go

@@ -75,5 +75,5 @@ func (this *AuthenticationWriter) Write(payload *alloc.Buffer) error {
 func (this *AuthenticationWriter) Release() {}
 
 func (this *AuthenticationWriter) Mtu() uint32 {
-	return effectiveConfig.Mtu - uint32(this.Authenticator.Overhead())
+	return effectiveConfig.Mtu.GetValue() - uint32(this.Authenticator.Overhead())
 }