REALITY: Add rate limiting to fallback handling via token bucket (#4553)

https://github.com/XTLS/REALITY/pull/12

go.mod

@@ -20,7 +20,7 @@ require (
 	github.com/stretchr/testify v1.10.0
 	github.com/v2fly/ss-bloomring v0.0.0-20210312155135-28617310f63e
 	github.com/vishvananda/netlink v1.3.1
-	github.com/xtls/reality v0.0.0-20250607105625-90e738a94c8c
+	github.com/xtls/reality v0.0.0-20250608132114-50752aec6bfb
 	go4.org/netipx v0.0.0-20231129151722-fdeea329fbba
 	golang.org/x/crypto v0.39.0
 	golang.org/x/net v0.41.0
@@ -41,6 +41,7 @@ require (
 	github.com/go-task/slim-sprig/v3 v3.0.0 // indirect
 	github.com/google/btree v1.1.2 // indirect
 	github.com/google/pprof v0.0.0-20240528025155-186aa0362fba // indirect
+	github.com/juju/ratelimit v1.0.2 // indirect
 	github.com/klauspost/compress v1.17.8 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
 	github.com/onsi/ginkgo/v2 v2.19.0 // indirect

go.sum

@@ -34,6 +34,8 @@ github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aN
 github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/h12w/go-socks5 v0.0.0-20200522160539-76189e178364 h1:5XxdakFhqd9dnXoAZy1Mb2R/DZ6D1e+0bGC/JhucGYI=
 github.com/h12w/go-socks5 v0.0.0-20200522160539-76189e178364/go.mod h1:eDJQioIyy4Yn3MVivT7rv/39gAJTrA7lgmYr8EW950c=
+github.com/juju/ratelimit v1.0.2 h1:sRxmtRiajbvrcLQT7S+JbqU0ntsb9W2yhSdNN8tWfaI=
+github.com/juju/ratelimit v1.0.2/go.mod h1:qapgC/Gy+xNh9UxzV13HGGl/6UXNN+ct+vwSgWNm/qk=
 github.com/klauspost/compress v1.17.8 h1:YcnTYrq7MikUT7k0Yb5eceMmALQPYBW/Xltxn0NAMnU=
 github.com/klauspost/compress v1.17.8/go.mod h1:Di0epgTjJY877eYKx5yC51cX2A2Vl2ibi7bDH9ttBbw=
 github.com/klauspost/cpuid/v2 v2.2.7 h1:ZWSB3igEs+d0qvnxR/ZBzXVmxkgt8DdzP6m9pfuVLDM=
@@ -76,8 +78,8 @@ github.com/vishvananda/netlink v1.3.1 h1:3AEMt62VKqz90r0tmNhog0r/PpWKmrEShJU0wJW
 github.com/vishvananda/netlink v1.3.1/go.mod h1:ARtKouGSTGchR8aMwmkzC0qiNPrrWO5JS/XMVl45+b4=
 github.com/vishvananda/netns v0.0.5 h1:DfiHV+j8bA32MFM7bfEunvT8IAqQ/NzSJHtcmW5zdEY=
 github.com/vishvananda/netns v0.0.5/go.mod h1:SpkAiCQRtJ6TvvxPnOSyH3BMl6unz3xZlaprSwhNNJM=
-github.com/xtls/reality v0.0.0-20250607105625-90e738a94c8c h1:GiY3/SynO0ujSH3rQDEIrE4MTTZM9KHufR3zx3JLD3c=
+github.com/xtls/reality v0.0.0-20250608132114-50752aec6bfb h1:X6ziJCMsFF8Ac/0F3W7+UbFdHZTu+r5nZ/smksHVxNQ=
-github.com/xtls/reality v0.0.0-20250607105625-90e738a94c8c/go.mod h1:Rkdcxe9Yd8SWQRRP+LSvX6wxk1m4lmNkyUZEHzbPDZw=
+github.com/xtls/reality v0.0.0-20250608132114-50752aec6bfb/go.mod h1:yD47RN65bDLZgyHWMfFDiqlzrq4usDMt/Xzsk6tMbhw=
 github.com/yuin/goldmark v1.4.1/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
 go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=

infra/conf/transport_internet.go

@@ -486,6 +486,12 @@ func (c *TLSConfig) Build() (proto.Message, error) {
 	return config, nil
 }
 
+type LimitFallback struct {
+	AfterBytes       uint64
+	BytesPerSec      uint64
+	BurstBytesPerSec uint64
+}
+
 type REALITYConfig struct {
 	MasterKeyLog string          `json:"masterKeyLog"`
 	Show         bool            `json:"show"`
@@ -500,6 +506,9 @@ type REALITYConfig struct {
 	MaxTimeDiff  uint64          `json:"maxTimeDiff"`
 	ShortIds     []string        `json:"shortIds"`
 
+	LimitFallbackUpload   LimitFallback `json:"limitFallbackUpload"`
+	LimitFallbackDownload LimitFallback `json:"limitFallbackDownload"`
+
 	Fingerprint string `json:"fingerprint"`
 	ServerName  string `json:"serverName"`
 	Password    string `json:"password"`
@@ -600,6 +609,15 @@ func (c *REALITYConfig) Build() (proto.Message, error) {
 		config.Xver = c.Xver
 		config.ServerNames = c.ServerNames
 		config.MaxTimeDiff = c.MaxTimeDiff
+
+		config.LimitFallbackUpload = new(reality.LimitFallback)
+		config.LimitFallbackUpload.AfterBytes = c.LimitFallbackUpload.AfterBytes
+		config.LimitFallbackUpload.BytesPerSec = c.LimitFallbackUpload.BytesPerSec
+		config.LimitFallbackUpload.BurstBytesPerSec = c.LimitFallbackUpload.BurstBytesPerSec
+		config.LimitFallbackDownload = new(reality.LimitFallback)
+		config.LimitFallbackDownload.AfterBytes = c.LimitFallbackDownload.AfterBytes
+		config.LimitFallbackDownload.BytesPerSec = c.LimitFallbackDownload.BytesPerSec
+		config.LimitFallbackDownload.BurstBytesPerSec = c.LimitFallbackDownload.BurstBytesPerSec
 	} else {
 		config.Fingerprint = strings.ToLower(c.Fingerprint)
 		if config.Fingerprint == "unsafe" || config.Fingerprint == "hellogolang" {

transport/internet/reality/config.go

@@ -32,6 +32,16 @@ func (c *Config) GetREALITYConfig() *reality.Config {
 
 		KeyLogWriter: KeyLogWriterFromConfig(c),
 	}
+	if c.LimitFallbackUpload != nil {
+		config.LimitFallbackUpload.AfterBytes = c.LimitFallbackUpload.AfterBytes
+		config.LimitFallbackUpload.BytesPerSec = c.LimitFallbackUpload.BytesPerSec
+		config.LimitFallbackUpload.BurstBytesPerSec = c.LimitFallbackUpload.BurstBytesPerSec
+	}
+	if c.LimitFallbackDownload != nil {
+		config.LimitFallbackDownload.AfterBytes = c.LimitFallbackDownload.AfterBytes
+		config.LimitFallbackDownload.BytesPerSec = c.LimitFallbackDownload.BytesPerSec
+		config.LimitFallbackDownload.BurstBytesPerSec = c.LimitFallbackDownload.BurstBytesPerSec
+	}
 	config.ServerNames = make(map[string]bool)
 	for _, serverName := range c.ServerNames {
 		config.ServerNames[serverName] = true

transport/internet/reality/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.35.1
-// 	protoc        v5.28.2
+// 	protoc        v5.29.4
 // source: transport/internet/reality/config.proto
 
 package reality
@@ -25,23 +25,25 @@ type Config struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Show         bool     `protobuf:"varint,1,opt,name=show,proto3" json:"show,omitempty"`
+	Show                  bool           `protobuf:"varint,1,opt,name=show,proto3" json:"show,omitempty"`
-	Dest         string   `protobuf:"bytes,2,opt,name=dest,proto3" json:"dest,omitempty"`
+	Dest                  string         `protobuf:"bytes,2,opt,name=dest,proto3" json:"dest,omitempty"`
-	Type         string   `protobuf:"bytes,3,opt,name=type,proto3" json:"type,omitempty"`
+	Type                  string         `protobuf:"bytes,3,opt,name=type,proto3" json:"type,omitempty"`
-	Xver         uint64   `protobuf:"varint,4,opt,name=xver,proto3" json:"xver,omitempty"`
+	Xver                  uint64         `protobuf:"varint,4,opt,name=xver,proto3" json:"xver,omitempty"`
-	ServerNames  []string `protobuf:"bytes,5,rep,name=server_names,json=serverNames,proto3" json:"server_names,omitempty"`
+	ServerNames           []string       `protobuf:"bytes,5,rep,name=server_names,json=serverNames,proto3" json:"server_names,omitempty"`
-	PrivateKey   []byte   `protobuf:"bytes,6,opt,name=private_key,json=privateKey,proto3" json:"private_key,omitempty"`
+	PrivateKey            []byte         `protobuf:"bytes,6,opt,name=private_key,json=privateKey,proto3" json:"private_key,omitempty"`
-	MinClientVer []byte   `protobuf:"bytes,7,opt,name=min_client_ver,json=minClientVer,proto3" json:"min_client_ver,omitempty"`
+	MinClientVer          []byte         `protobuf:"bytes,7,opt,name=min_client_ver,json=minClientVer,proto3" json:"min_client_ver,omitempty"`
-	MaxClientVer []byte   `protobuf:"bytes,8,opt,name=max_client_ver,json=maxClientVer,proto3" json:"max_client_ver,omitempty"`
+	MaxClientVer          []byte         `protobuf:"bytes,8,opt,name=max_client_ver,json=maxClientVer,proto3" json:"max_client_ver,omitempty"`
-	MaxTimeDiff  uint64   `protobuf:"varint,9,opt,name=max_time_diff,json=maxTimeDiff,proto3" json:"max_time_diff,omitempty"`
+	MaxTimeDiff           uint64         `protobuf:"varint,9,opt,name=max_time_diff,json=maxTimeDiff,proto3" json:"max_time_diff,omitempty"`
-	ShortIds     [][]byte `protobuf:"bytes,10,rep,name=short_ids,json=shortIds,proto3" json:"short_ids,omitempty"`
+	ShortIds              [][]byte       `protobuf:"bytes,10,rep,name=short_ids,json=shortIds,proto3" json:"short_ids,omitempty"`
-	Fingerprint  string   `protobuf:"bytes,21,opt,name=Fingerprint,proto3" json:"Fingerprint,omitempty"`
+	Fingerprint           string         `protobuf:"bytes,21,opt,name=Fingerprint,proto3" json:"Fingerprint,omitempty"`
-	ServerName   string   `protobuf:"bytes,22,opt,name=server_name,json=serverName,proto3" json:"server_name,omitempty"`
+	ServerName            string         `protobuf:"bytes,22,opt,name=server_name,json=serverName,proto3" json:"server_name,omitempty"`
-	PublicKey    []byte   `protobuf:"bytes,23,opt,name=public_key,json=publicKey,proto3" json:"public_key,omitempty"`
+	PublicKey             []byte         `protobuf:"bytes,23,opt,name=public_key,json=publicKey,proto3" json:"public_key,omitempty"`
-	ShortId      []byte   `protobuf:"bytes,24,opt,name=short_id,json=shortId,proto3" json:"short_id,omitempty"`
+	ShortId               []byte         `protobuf:"bytes,24,opt,name=short_id,json=shortId,proto3" json:"short_id,omitempty"`
-	SpiderX      string   `protobuf:"bytes,25,opt,name=spider_x,json=spiderX,proto3" json:"spider_x,omitempty"`
+	SpiderX               string         `protobuf:"bytes,25,opt,name=spider_x,json=spiderX,proto3" json:"spider_x,omitempty"`
-	SpiderY      []int64  `protobuf:"varint,26,rep,packed,name=spider_y,json=spiderY,proto3" json:"spider_y,omitempty"`
+	SpiderY               []int64        `protobuf:"varint,26,rep,packed,name=spider_y,json=spiderY,proto3" json:"spider_y,omitempty"`
-	MasterKeyLog string   `protobuf:"bytes,27,opt,name=master_key_log,json=masterKeyLog,proto3" json:"master_key_log,omitempty"`
+	MasterKeyLog          string         `protobuf:"bytes,27,opt,name=master_key_log,json=masterKeyLog,proto3" json:"master_key_log,omitempty"`
+	LimitFallbackUpload   *LimitFallback `protobuf:"bytes,28,opt,name=limit_fallback_upload,json=limitFallbackUpload,proto3" json:"limit_fallback_upload,omitempty"`
+	LimitFallbackDownload *LimitFallback `protobuf:"bytes,29,opt,name=limit_fallback_download,json=limitFallbackDownload,proto3" json:"limit_fallback_download,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -193,6 +195,81 @@ func (x *Config) GetMasterKeyLog() string {
 	return ""
 }
 
+func (x *Config) GetLimitFallbackUpload() *LimitFallback {
+	if x != nil {
+		return x.LimitFallbackUpload
+	}
+	return nil
+}
+
+func (x *Config) GetLimitFallbackDownload() *LimitFallback {
+	if x != nil {
+		return x.LimitFallbackDownload
+	}
+	return nil
+}
+
+type LimitFallback struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	AfterBytes       uint64 `protobuf:"varint,1,opt,name=after_bytes,json=afterBytes,proto3" json:"after_bytes,omitempty"`
+	BytesPerSec      uint64 `protobuf:"varint,2,opt,name=bytes_per_sec,json=bytesPerSec,proto3" json:"bytes_per_sec,omitempty"`
+	BurstBytesPerSec uint64 `protobuf:"varint,3,opt,name=burst_bytes_per_sec,json=burstBytesPerSec,proto3" json:"burst_bytes_per_sec,omitempty"`
+}
+
+func (x *LimitFallback) Reset() {
+	*x = LimitFallback{}
+	mi := &file_transport_internet_reality_config_proto_msgTypes[1]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *LimitFallback) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*LimitFallback) ProtoMessage() {}
+
+func (x *LimitFallback) ProtoReflect() protoreflect.Message {
+	mi := &file_transport_internet_reality_config_proto_msgTypes[1]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use LimitFallback.ProtoReflect.Descriptor instead.
+func (*LimitFallback) Descriptor() ([]byte, []int) {
+	return file_transport_internet_reality_config_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *LimitFallback) GetAfterBytes() uint64 {
+	if x != nil {
+		return x.AfterBytes
+	}
+	return 0
+}
+
+func (x *LimitFallback) GetBytesPerSec() uint64 {
+	if x != nil {
+		return x.BytesPerSec
+	}
+	return 0
+}
+
+func (x *LimitFallback) GetBurstBytesPerSec() uint64 {
+	if x != nil {
+		return x.BurstBytesPerSec
+	}
+	return 0
+}
+
 var File_transport_internet_reality_config_proto protoreflect.FileDescriptor
 
 var file_transport_internet_reality_config_proto_rawDesc = []byte{
@@ -200,7 +277,7 @@ var file_transport_internet_reality_config_proto_rawDesc = []byte{
 	0x72, 0x6e, 0x65, 0x74, 0x2f, 0x72, 0x65, 0x61, 0x6c, 0x69, 0x74, 0x79, 0x2f, 0x63, 0x6f, 0x6e,
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@@ -232,16 +309,37 @@ var file_transport_internet_reality_config_proto_rawDesc = []byte{
 	0x0a, 0x08, 0x73, 0x70, 0x69, 0x64, 0x65, 0x72, 0x5f, 0x79, 0x18, 0x1a, 0x20, 0x03, 0x28, 0x03,
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+	0x74, 0x2e, 0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2e, 0x52, 0x65, 0x61, 0x6c, 0x69,
+	0x74, 0x79, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -256,16 +354,19 @@ func file_transport_internet_reality_config_proto_rawDescGZIP() []byte {
 	return file_transport_internet_reality_config_proto_rawDescData
 }
 
-var file_transport_internet_reality_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_transport_internet_reality_config_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
 var file_transport_internet_reality_config_proto_goTypes = []any{
-	(*Config)(nil), // 0: xray.transport.internet.reality.Config
+	(*Config)(nil),        // 0: xray.transport.internet.reality.Config
+	(*LimitFallback)(nil), // 1: xray.transport.internet.reality.LimitFallback
 }
 var file_transport_internet_reality_config_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
+	1, // 0: xray.transport.internet.reality.Config.limit_fallback_upload:type_name -> xray.transport.internet.reality.LimitFallback
-	0, // [0:0] is the sub-list for method input_type
+	1, // 1: xray.transport.internet.reality.Config.limit_fallback_download:type_name -> xray.transport.internet.reality.LimitFallback
-	0, // [0:0] is the sub-list for extension type_name
+	2, // [2:2] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for extension extendee
+	2, // [2:2] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for field type_name
+	2, // [2:2] is the sub-list for extension type_name
+	2, // [2:2] is the sub-list for extension extendee
+	0, // [0:2] is the sub-list for field type_name
 }
 
 func init() { file_transport_internet_reality_config_proto_init() }
@@ -279,7 +380,7 @@ func file_transport_internet_reality_config_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_transport_internet_reality_config_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   1,
+			NumMessages:   2,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

transport/internet/reality/config.proto

@@ -25,4 +25,13 @@ message Config {
   string spider_x = 25;
   repeated int64 spider_y = 26;
   string master_key_log = 27;
+
+  LimitFallback limit_fallback_upload = 28;
+  LimitFallback limit_fallback_download = 29;
+}
+
+message LimitFallback {
+  uint64 after_bytes = 1;
+  uint64 bytes_per_sec = 2;
+  uint64 burst_bytes_per_sec = 3;
 }