chore: add rate limiting support for reality listener

listener/inbound/reality.go

@@ -9,6 +9,15 @@ type RealityConfig struct {
 	ServerNames       []string `inbound:"server-names"`
 	MaxTimeDifference int      `inbound:"max-time-difference,omitempty"`
 	Proxy             string   `inbound:"proxy,omitempty"`
+
+	LimitFallbackUpload   RealityLimitFallback `inbound:"limit-fallback-upload,omitempty"`
+	LimitFallbackDownload RealityLimitFallback `inbound:"limit-fallback-download,omitempty"`
+}
+
+type RealityLimitFallback struct {
+	AfterBytes       uint64 `inbound:"after-bytes,omitempty"`
+	BytesPerSec      uint64 `inbound:"bytes-per-sec,omitempty"`
+	BurstBytesPerSec uint64 `inbound:"burst-bytes-per-sec,omitempty"`
 }
 
 func (c RealityConfig) Build() reality.Config {
@@ -19,5 +28,16 @@ func (c RealityConfig) Build() reality.Config {
 		ServerNames:       c.ServerNames,
 		MaxTimeDifference: c.MaxTimeDifference,
 		Proxy:             c.Proxy,
+
+		LimitFallbackUpload: reality.LimitFallback{
+			AfterBytes:       c.LimitFallbackUpload.AfterBytes,
+			BytesPerSec:      c.LimitFallbackUpload.BytesPerSec,
+			BurstBytesPerSec: c.LimitFallbackUpload.BurstBytesPerSec,
+		},
+		LimitFallbackDownload: reality.LimitFallback{
+			AfterBytes:       c.LimitFallbackDownload.AfterBytes,
+			BytesPerSec:      c.LimitFallbackDownload.BytesPerSec,
+			BurstBytesPerSec: c.LimitFallbackDownload.BurstBytesPerSec,
+		},
 	}
 }

listener/reality/reality.go

@@ -20,6 +20,7 @@ import (
 )
 
 type Conn = utls.Conn
+type LimitFallback = utls.RealityLimitFallback
 
 type Config struct {
 	Dest              string
@@ -28,6 +29,9 @@ type Config struct {
 	ServerNames       []string
 	MaxTimeDifference int
 	Proxy             string
+
+	LimitFallbackUpload   LimitFallback
+	LimitFallbackDownload LimitFallback
 }
 
 func (c Config) Build(tunnel C.Tunnel) (*Builder, error) {
@@ -73,6 +77,9 @@ func (c Config) Build(tunnel C.Tunnel) (*Builder, error) {
 		return inner.HandleTcp(tunnel, address, c.Proxy)
 	}
 
+	realityConfig.LimitFallbackUpload = c.LimitFallbackUpload
+	realityConfig.LimitFallbackDownload = c.LimitFallbackDownload
+
 	return &Builder{realityConfig}, nil
 }