Sockopt: Fix Windows UDP `interface` bind; Allow `customSockopt` work for UDP (#4504)

infra/conf/transport_internet.go

@@ -691,10 +691,11 @@ func (p TransportProtocol) Build() (string, error) {
 }
 
 type CustomSockoptConfig struct {
-	Level string `json:"level"`
-	Opt   string `json:"opt"`
-	Value string `json:"value"`
-	Type  string `json:"type"`
+	Network string `json:"network"`
+	Level   string `json:"level"`
+	Opt     string `json:"opt"`
+	Value   string `json:"value"`
+	Type    string `json:"type"`
 }
 
 type SocketConfig struct {
@@ -777,10 +778,11 @@ func (c *SocketConfig) Build() (*internet.SocketConfig, error) {
 
 	for _, copt := range c.CustomSockopt {
 		customSockopt := &internet.CustomSockopt{
-			Level: copt.Level,
-			Opt:   copt.Opt,
-			Value: copt.Value,
-			Type:  copt.Type,
+			Network: copt.Network,
+			Level:   copt.Level,
+			Opt:     copt.Opt,
+			Value:   copt.Value,
+			Type:    copt.Type,
 		}
 		customSockopts = append(customSockopts, customSockopt)
 	}

transport/internet/config.pb.go

@@ -417,10 +417,11 @@ type CustomSockopt struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Level string `protobuf:"bytes,1,opt,name=level,proto3" json:"level,omitempty"`
-	Opt   string `protobuf:"bytes,2,opt,name=opt,proto3" json:"opt,omitempty"`
-	Value string `protobuf:"bytes,3,opt,name=value,proto3" json:"value,omitempty"`
-	Type  string `protobuf:"bytes,4,opt,name=type,proto3" json:"type,omitempty"`
+	Network string `protobuf:"bytes,1,opt,name=network,proto3" json:"network,omitempty"`
+	Level   string `protobuf:"bytes,2,opt,name=level,proto3" json:"level,omitempty"`
+	Opt     string `protobuf:"bytes,3,opt,name=opt,proto3" json:"opt,omitempty"`
+	Value   string `protobuf:"bytes,4,opt,name=value,proto3" json:"value,omitempty"`
+	Type    string `protobuf:"bytes,5,opt,name=type,proto3" json:"type,omitempty"`
 }
 
 func (x *CustomSockopt) Reset() {
@@ -453,6 +454,13 @@ func (*CustomSockopt) Descriptor() ([]byte, []int) {
 	return file_transport_internet_config_proto_rawDescGZIP(), []int{3}
 }
 
+func (x *CustomSockopt) GetNetwork() string {
+	if x != nil {
+		return x.Network
+	}
+	return ""
+}
+
 func (x *CustomSockopt) GetLevel() string {
 	if x != nil {
 		return x.Level
@@ -740,105 +748,107 @@ var file_transport_internet_config_proto_rawDesc = []byte{
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+	0x6f, 0x33,
 }
 
 var (

transport/internet/config.proto

@@ -65,10 +65,11 @@ message ProxyConfig {
 }
 
 message CustomSockopt {
-  string level = 1;
-  string opt = 2;
-  string value = 3;
-  string type = 4;
+  string network = 1;
+  string level = 2;
+  string opt = 3;
+  string value = 4;
+  string type = 5;
 }
 
 // SocketConfig is options to be applied on network sockets.

transport/internet/sockopt_linux.go

@@ -3,6 +3,7 @@ package internet
 import (
 	"net"
 	"strconv"
+	"strings"
 	"syscall"
 
 	"github.com/xtls/xray-core/common/errors"
@@ -35,6 +36,8 @@ func bindAddr(fd uintptr, ip []byte, port uint32) error {
 	return syscall.Bind(int(fd), sockaddr)
 }
 
+// applyOutboundSocketOptions applies socket options for outbound connection.
+// note that unlike other part of Xray, this function needs network with speified network stack(tcp4/tcp6/udp4/udp6)
 func applyOutboundSocketOptions(network string, address string, fd uintptr, config *SocketConfig) error {
 	if config.Mark != 0 {
 		if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, int(config.Mark)); err != nil {
@@ -103,30 +106,38 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
 			}
 		}
 
-		if len(config.CustomSockopt) > 0 {
-			for _, custom := range config.CustomSockopt {
-				var level = 0x6 // default TCP
-				var opt int
-				if len(custom.Opt) == 0 {
-					return errors.New("No opt!")
-				} else {
-					opt, _ = strconv.Atoi(custom.Opt)
-				}
-				if custom.Level != "" {
-					level, _ = strconv.Atoi(custom.Level)
+	}
+
+	if len(config.CustomSockopt) > 0 {
+		for _, custom := range config.CustomSockopt {
+			// Skip unwanted network type
+			// network might be tcp4 or tcp6
+			// use HasPrefix so that "tcp" can match tcp4/6 with "tcp" if user want to control all tcp (udp is also the same)
+			// if it is empty, strings.HasPrefix will always return true to make it apply for all networks
+			if !strings.HasPrefix(network, custom.Network) {
+				continue
+			}
+			var level = 0x6 // default TCP
+			var opt int
+			if len(custom.Opt) == 0 {
+				return errors.New("No opt!")
+			} else {
+				opt, _ = strconv.Atoi(custom.Opt)
+			}
+			if custom.Level != "" {
+				level, _ = strconv.Atoi(custom.Level)
+			}
+			if custom.Type == "int" {
+				value, _ := strconv.Atoi(custom.Value)
+				if err := syscall.SetsockoptInt(int(fd), level, opt, value); err != nil {
+					return errors.New("failed to set CustomSockoptInt", opt, value, err)
 				}
-				if custom.Type == "int" {
-					value, _ := strconv.Atoi(custom.Value)
-					if err := syscall.SetsockoptInt(int(fd), level, opt, value); err != nil {
-						return errors.New("failed to set CustomSockoptInt", opt, value, err)
-					}
-				} else if custom.Type == "str" {
-					if err := syscall.SetsockoptString(int(fd), level, opt, custom.Value); err != nil {
-						return errors.New("failed to set CustomSockoptString", opt, custom.Value, err)
-					}
-				} else {
-					return errors.New("unknown CustomSockopt type:", custom.Type)
+			} else if custom.Type == "str" {
+				if err := syscall.SetsockoptString(int(fd), level, opt, custom.Value); err != nil {
+					return errors.New("failed to set CustomSockoptString", opt, custom.Value, err)
 				}
+			} else {
+				return errors.New("unknown CustomSockopt type:", custom.Type)
 			}
 		}
 	}
@@ -140,6 +151,8 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
 	return nil
 }
 
+// applyInboundSocketOptions applies socket options for inbound listener.
+// note that unlike other part of Xray, this function needs network with speified network stack(tcp4/tcp6/udp4/udp6)
 func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig) error {
 	if config.Mark != 0 {
 		if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, int(config.Mark)); err != nil {

transport/internet/sockopt_windows.go

@@ -33,7 +33,7 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
 		if err != nil {
 			return errors.New("failed to find the interface").Base(err)
 		}
-		isV4 := (network == "tcp4")
+		isV4 := (network == "tcp4" || network == "udp4")
 		if isV4 {
 			var bytes [4]byte
 			binary.BigEndian.PutUint32(bytes[:], uint32(inf.Index))

transport/internet/system_dialer.go

@@ -73,7 +73,13 @@ func (d *DefaultSystemDialer) Dial(ctx context.Context, src net.Address, dest ne
 				return nil, err
 			}
 			sys.Control(func(fd uintptr) {
-				if err := applyOutboundSocketOptions("udp", dest.NetAddr(), fd, sockopt); err != nil {
+				var network string
+				if destAddr.IP.To4() != nil {
+					network = "udp4"
+				} else {
+					network = "udp6"
+				}
+				if err := applyOutboundSocketOptions(network, dest.NetAddr(), fd, sockopt); err != nil {
 					errors.LogInfo(ctx, err, "failed to apply socket options")
 				}
 			})