feat: add tcp_user_timeout

```json
{"streamSettings":{"sockopt": {"tcpUserTimeout": 10000}}}
```

run `gofmt -w -s .` as well

common/xudp/xudp_test.go

@@ -11,7 +11,7 @@ import (
 func TestXudpReadWrite(t *testing.T) {
 	addr, _ := net.ParseDestination("tcp:127.0.0.1:1345")
 	mb := make(buf.MultiBuffer, 0, 16)
-	m := buf.MultiBufferContainer {
+	m := buf.MultiBufferContainer{
 		MultiBuffer: mb,
 	}
 	var arr [8]byte
@@ -33,4 +33,4 @@ func TestXudpReadWrite(t *testing.T) {
 	if dest[0].UDP.Port != 1345 {
 		t.Error("failed to parse xudp buffer")
 	}
-}
+}

infra/conf/transport_internet.go

@@ -617,6 +617,7 @@ type SocketConfig struct {
 	TCPKeepAliveIdle     int32       `json:"tcpKeepAliveIdle"`
 	TCPCongestion        string      `json:"tcpCongestion"`
 	TCPWindowClamp       int32       `json:"tcpWindowClamp"`
+	TCPUserTimeout       int32       `json:"tcpUserTimeout"`
 	V6only               bool        `json:"v6only"`
 	Interface            string      `json:"interface"`
 }
@@ -669,6 +670,7 @@ func (c *SocketConfig) Build() (*internet.SocketConfig, error) {
 		TcpKeepAliveIdle:     c.TCPKeepAliveIdle,
 		TcpCongestion:        c.TCPCongestion,
 		TcpWindowClamp:       c.TCPWindowClamp,
+		TcpUserTimeout:       c.TCPUserTimeout,
 		V6Only:               c.V6only,
 		Interface:            c.Interface,
 	}, nil

transport/internet/config.pb.go

@@ -428,6 +428,7 @@ type SocketConfig struct {
 	Interface                  string         `protobuf:"bytes,13,opt,name=interface,proto3" json:"interface,omitempty"`
 	V6Only                     bool           `protobuf:"varint,14,opt,name=v6only,proto3" json:"v6only,omitempty"`
 	TcpWindowClamp             int32          `protobuf:"varint,15,opt,name=tcp_window_clamp,json=tcpWindowClamp,proto3" json:"tcp_window_clamp,omitempty"`
+	TcpUserTimeout             int32          `protobuf:"varint,16,opt,name=tcp_user_timeout,json=tcpUserTimeout,proto3" json:"tcp_user_timeout,omitempty"`
 }
 
 func (x *SocketConfig) Reset() {
@@ -567,6 +568,13 @@ func (x *SocketConfig) GetTcpWindowClamp() int32 {
 	return 0
 }
 
+func (x *SocketConfig) GetTcpUserTimeout() int32 {
+	if x != nil {
+		return x.TcpUserTimeout
+	}
+	return 0
+}
+
 var File_transport_internet_config_proto protoreflect.FileDescriptor
 
 var file_transport_internet_config_proto_rawDesc = []byte{
@@ -619,7 +627,7 @@ var file_transport_internet_config_proto_rawDesc = []byte{
 	0x12, 0x30, 0x0a, 0x13, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x4c, 0x61, 0x79,
 	0x65, 0x72, 0x50, 0x72, 0x6f, 0x78, 0x79, 0x18, 0x02, 0x20, 0x01, 0x28, 0x08, 0x52, 0x13, 0x74,
 	0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x4c, 0x61, 0x79, 0x65, 0x72, 0x50, 0x72, 0x6f,
-	0x78, 0x79, 0x22, 0xc8, 0x05, 0x0a, 0x0c, 0x53, 0x6f, 0x63, 0x6b, 0x65, 0x74, 0x43, 0x6f, 0x6e,
+	0x78, 0x79, 0x22, 0xf2, 0x05, 0x0a, 0x0c, 0x53, 0x6f, 0x63, 0x6b, 0x65, 0x74, 0x43, 0x6f, 0x6e,
 	0x66, 0x69, 0x67, 0x12, 0x12, 0x0a, 0x04, 0x6d, 0x61, 0x72, 0x6b, 0x18, 0x01, 0x20, 0x01, 0x28,
 	0x05, 0x52, 0x04, 0x6d, 0x61, 0x72, 0x6b, 0x12, 0x10, 0x0a, 0x03, 0x74, 0x66, 0x6f, 0x18, 0x02,
 	0x20, 0x01, 0x28, 0x05, 0x52, 0x03, 0x74, 0x66, 0x6f, 0x12, 0x48, 0x0a, 0x06, 0x74, 0x70, 0x72,
@@ -660,27 +668,30 @@ var file_transport_internet_config_proto_rawDesc = []byte{
 	0x6f, 0x6e, 0x6c, 0x79, 0x18, 0x0e, 0x20, 0x01, 0x28, 0x08, 0x52, 0x06, 0x76, 0x36, 0x6f, 0x6e,
 	0x6c, 0x79, 0x12, 0x28, 0x0a, 0x10, 0x74, 0x63, 0x70, 0x5f, 0x77, 0x69, 0x6e, 0x64, 0x6f, 0x77,
 	0x5f, 0x63, 0x6c, 0x61, 0x6d, 0x70, 0x18, 0x0f, 0x20, 0x01, 0x28, 0x05, 0x52, 0x0e, 0x74, 0x63,
-	0x70, 0x57, 0x69, 0x6e, 0x64, 0x6f, 0x77, 0x43, 0x6c, 0x61, 0x6d, 0x70, 0x22, 0x2f, 0x0a, 0x0a,
-	0x54, 0x50, 0x72, 0x6f, 0x78, 0x79, 0x4d, 0x6f, 0x64, 0x65, 0x12, 0x07, 0x0a, 0x03, 0x4f, 0x66,
-	0x66, 0x10, 0x00, 0x12, 0x0a, 0x0a, 0x06, 0x54, 0x50, 0x72, 0x6f, 0x78, 0x79, 0x10, 0x01, 0x12,
-	0x0c, 0x0a, 0x08, 0x52, 0x65, 0x64, 0x69, 0x72, 0x65, 0x63, 0x74, 0x10, 0x02, 0x2a, 0x5a, 0x0a,
-	0x11, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x63,
-	0x6f, 0x6c, 0x12, 0x07, 0x0a, 0x03, 0x54, 0x43, 0x50, 0x10, 0x00, 0x12, 0x07, 0x0a, 0x03, 0x55,
-	0x44, 0x50, 0x10, 0x01, 0x12, 0x08, 0x0a, 0x04, 0x4d, 0x4b, 0x43, 0x50, 0x10, 0x02, 0x12, 0x0d,
-	0x0a, 0x09, 0x57, 0x65, 0x62, 0x53, 0x6f, 0x63, 0x6b, 0x65, 0x74, 0x10, 0x03, 0x12, 0x08, 0x0a,
-	0x04, 0x48, 0x54, 0x54, 0x50, 0x10, 0x04, 0x12, 0x10, 0x0a, 0x0c, 0x44, 0x6f, 0x6d, 0x61, 0x69,
-	0x6e, 0x53, 0x6f, 0x63, 0x6b, 0x65, 0x74, 0x10, 0x05, 0x2a, 0x41, 0x0a, 0x0e, 0x44, 0x6f, 0x6d,
-	0x61, 0x69, 0x6e, 0x53, 0x74, 0x72, 0x61, 0x74, 0x65, 0x67, 0x79, 0x12, 0x09, 0x0a, 0x05, 0x41,
-	0x53, 0x5f, 0x49, 0x53, 0x10, 0x00, 0x12, 0x0a, 0x0a, 0x06, 0x55, 0x53, 0x45, 0x5f, 0x49, 0x50,
-	0x10, 0x01, 0x12, 0x0b, 0x0a, 0x07, 0x55, 0x53, 0x45, 0x5f, 0x49, 0x50, 0x34, 0x10, 0x02, 0x12,
-	0x0b, 0x0a, 0x07, 0x55, 0x53, 0x45, 0x5f, 0x49, 0x50, 0x36, 0x10, 0x03, 0x42, 0x67, 0x0a, 0x1b,
-	0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f,
-	0x72, 0x74, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x50, 0x01, 0x5a, 0x2c, 0x67,
-	0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f, 0x78,
-	0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f,
-	0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0xaa, 0x02, 0x17, 0x58, 0x72,
-	0x61, 0x79, 0x2e, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x49, 0x6e, 0x74,
-	0x65, 0x72, 0x6e, 0x65, 0x74, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x70, 0x57, 0x69, 0x6e, 0x64, 0x6f, 0x77, 0x43, 0x6c, 0x61, 0x6d, 0x70, 0x12, 0x28, 0x0a, 0x10,
+	0x74, 0x63, 0x70, 0x5f, 0x75, 0x73, 0x65, 0x72, 0x5f, 0x74, 0x69, 0x6d, 0x65, 0x6f, 0x75, 0x74,
+	0x18, 0x10, 0x20, 0x01, 0x28, 0x05, 0x52, 0x0e, 0x74, 0x63, 0x70, 0x55, 0x73, 0x65, 0x72, 0x54,
+	0x69, 0x6d, 0x65, 0x6f, 0x75, 0x74, 0x22, 0x2f, 0x0a, 0x0a, 0x54, 0x50, 0x72, 0x6f, 0x78, 0x79,
+	0x4d, 0x6f, 0x64, 0x65, 0x12, 0x07, 0x0a, 0x03, 0x4f, 0x66, 0x66, 0x10, 0x00, 0x12, 0x0a, 0x0a,
+	0x06, 0x54, 0x50, 0x72, 0x6f, 0x78, 0x79, 0x10, 0x01, 0x12, 0x0c, 0x0a, 0x08, 0x52, 0x65, 0x64,
+	0x69, 0x72, 0x65, 0x63, 0x74, 0x10, 0x02, 0x2a, 0x5a, 0x0a, 0x11, 0x54, 0x72, 0x61, 0x6e, 0x73,
+	0x70, 0x6f, 0x72, 0x74, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x12, 0x07, 0x0a, 0x03,
+	0x54, 0x43, 0x50, 0x10, 0x00, 0x12, 0x07, 0x0a, 0x03, 0x55, 0x44, 0x50, 0x10, 0x01, 0x12, 0x08,
+	0x0a, 0x04, 0x4d, 0x4b, 0x43, 0x50, 0x10, 0x02, 0x12, 0x0d, 0x0a, 0x09, 0x57, 0x65, 0x62, 0x53,
+	0x6f, 0x63, 0x6b, 0x65, 0x74, 0x10, 0x03, 0x12, 0x08, 0x0a, 0x04, 0x48, 0x54, 0x54, 0x50, 0x10,
+	0x04, 0x12, 0x10, 0x0a, 0x0c, 0x44, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x53, 0x6f, 0x63, 0x6b, 0x65,
+	0x74, 0x10, 0x05, 0x2a, 0x41, 0x0a, 0x0e, 0x44, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x53, 0x74, 0x72,
+	0x61, 0x74, 0x65, 0x67, 0x79, 0x12, 0x09, 0x0a, 0x05, 0x41, 0x53, 0x5f, 0x49, 0x53, 0x10, 0x00,
+	0x12, 0x0a, 0x0a, 0x06, 0x55, 0x53, 0x45, 0x5f, 0x49, 0x50, 0x10, 0x01, 0x12, 0x0b, 0x0a, 0x07,
+	0x55, 0x53, 0x45, 0x5f, 0x49, 0x50, 0x34, 0x10, 0x02, 0x12, 0x0b, 0x0a, 0x07, 0x55, 0x53, 0x45,
+	0x5f, 0x49, 0x50, 0x36, 0x10, 0x03, 0x42, 0x67, 0x0a, 0x1b, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72,
+	0x61, 0x79, 0x2e, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x69, 0x6e, 0x74,
+	0x65, 0x72, 0x6e, 0x65, 0x74, 0x50, 0x01, 0x5a, 0x2c, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e,
+	0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f,
+	0x72, 0x65, 0x2f, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74,
+	0x65, 0x72, 0x6e, 0x65, 0x74, 0xaa, 0x02, 0x17, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x54, 0x72, 0x61,
+	0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x62,
+	0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (

transport/internet/config.proto

@@ -104,4 +104,6 @@ message SocketConfig {
   bool   v6only = 14;
 
   int32 tcp_window_clamp = 15;
+
+  int32 tcp_user_timeout = 16;
 }

transport/internet/sockopt_linux.go

@@ -7,13 +7,6 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-const (
-	// For incoming connections.
-	TCP_FASTOPEN = 23
-	// For out-going connections.
-	TCP_FASTOPEN_CONNECT = 30
-)
-
 func bindAddr(fd uintptr, ip []byte, port uint32) error {
 	setReuseAddr(fd)
 	setReusePort(fd)
@@ -59,8 +52,8 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
 			tfo = 1
 		}
 		if tfo >= 0 {
-			if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, TCP_FASTOPEN_CONNECT, tfo); err != nil {
-				return newError("failed to set TCP_FASTOPEN_CONNECT=", tfo).Base(err)
+			if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, unix.TCP_FASTOPEN_CONNECT, tfo); err != nil {
+				return newError("failed to set TCP_FASTOPEN_CONNECT", tfo).Base(err)
 			}
 		}
 
@@ -95,6 +88,12 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
 				return newError("failed to set TCP_WINDOW_CLAMP", err)
 			}
 		}
+
+		if config.TcpUserTimeout > 0 {
+			if err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, unix.TCP_USER_TIMEOUT, int(config.TcpUserTimeout)); err != nil {
+				return newError("failed to set TCP_USER_TIMEOUT", err)
+			}
+		}
 	}
 
 	if config.Tproxy.IsEnabled() {
@@ -115,8 +114,8 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
 	if isTCPSocket(network) {
 		tfo := config.ParseTFOValue()
 		if tfo >= 0 {
-			if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, TCP_FASTOPEN, tfo); err != nil {
-				return newError("failed to set TCP_FASTOPEN=", tfo).Base(err)
+			if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, unix.TCP_FASTOPEN, tfo); err != nil {
+				return newError("failed to set TCP_FASTOPEN", tfo).Base(err)
 			}
 		}
 
@@ -151,6 +150,12 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
 				return newError("failed to set TCP_WINDOW_CLAMP", err)
 			}
 		}
+
+		if config.TcpUserTimeout > 0 {
+			if err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, unix.TCP_USER_TIMEOUT, int(config.TcpUserTimeout)); err != nil {
+				return newError("failed to set TCP_USER_TIMEOUT", err)
+			}
+		}
 	}
 
 	if config.Tproxy.IsEnabled() {