Fix domain strategy

adapter/inbound.go

@@ -72,7 +72,7 @@ type InboundContext struct {
 	UDPConnect                bool
 	UDPTimeout                time.Duration
 
-	NetworkStrategy     C.NetworkStrategy
+	NetworkStrategy     *C.NetworkStrategy
 	NetworkType         []C.InterfaceType
 	FallbackNetworkType []C.InterfaceType
 	FallbackDelay       time.Duration

adapter/network.go

@@ -28,7 +28,7 @@ type NetworkManager interface {
 }
 
 type NetworkOptions struct {
-	NetworkStrategy     C.NetworkStrategy
+	NetworkStrategy     *C.NetworkStrategy
 	NetworkType         []C.InterfaceType
 	FallbackNetworkType []C.InterfaceType
 	FallbackDelay       time.Duration

common/dialer/default.go

@@ -9,6 +9,7 @@ import (
 	"github.com/sagernet/sing-box/adapter"
 	"github.com/sagernet/sing-box/common/conntrack"
 	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/experimental/libbox/platform"
 	"github.com/sagernet/sing-box/option"
 	"github.com/sagernet/sing/common"
 	"github.com/sagernet/sing/common/atomic"
@@ -16,6 +17,7 @@ import (
 	E "github.com/sagernet/sing/common/exceptions"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/service"
 )
 
 var (
@@ -33,19 +35,22 @@ type DefaultDialer struct {
 	udpAddr6             string
 	isWireGuardListener  bool
 	networkManager       adapter.NetworkManager
-	networkStrategy      C.NetworkStrategy
+	networkStrategy      *C.NetworkStrategy
 	networkType          []C.InterfaceType
 	fallbackNetworkType  []C.InterfaceType
 	networkFallbackDelay time.Duration
 	networkLastFallback  atomic.TypedValue[time.Time]
 }
 
-func NewDefault(networkManager adapter.NetworkManager, options option.DialerOptions) (*DefaultDialer, error) {
+func NewDefault(ctx context.Context, options option.DialerOptions) (*DefaultDialer, error) {
+	networkManager := service.FromContext[adapter.NetworkManager](ctx)
+	platformInterface := service.FromContext[platform.Interface](ctx)
+
 	var (
 		dialer               net.Dialer
 		listener             net.ListenConfig
 		interfaceFinder      control.InterfaceFinder
-		networkStrategy      C.NetworkStrategy
+		networkStrategy      *C.NetworkStrategy
 		networkType          []C.InterfaceType
 		fallbackNetworkType  []C.InterfaceType
 		networkFallbackDelay time.Duration
@@ -74,31 +79,37 @@ func NewDefault(networkManager adapter.NetworkManager, options option.DialerOpti
 			listener.Control = control.Append(listener.Control, control.RoutingMark(autoRedirectOutputMark))
 		}
 	}
-	if C.NetworkStrategy(options.NetworkStrategy) != C.NetworkStrategyDefault {
-		if options.BindInterface != "" || options.Inet4BindAddress != nil || options.Inet6BindAddress != nil {
-			return nil, E.New("`network_strategy` is conflict with `bind_interface`, `inet4_bind_address` and `inet6_bind_address`")
-		}
-		networkStrategy = C.NetworkStrategy(options.NetworkStrategy)
-		networkType = common.Map(options.NetworkType, option.InterfaceType.Build)
-		fallbackNetworkType = common.Map(options.FallbackNetworkType, option.InterfaceType.Build)
-		networkFallbackDelay = time.Duration(options.NetworkFallbackDelay)
-		if networkManager == nil || !networkManager.AutoDetectInterface() {
-			return nil, E.New("`route.auto_detect_interface` is require by `network_strategy`")
+	disableDefaultBind := options.BindInterface != "" || options.Inet4BindAddress != nil || options.Inet6BindAddress != nil
+	if disableDefaultBind || options.TCPFastOpen {
+		if options.NetworkStrategy != nil || len(options.NetworkType) > 0 && options.FallbackNetworkType == nil && options.FallbackDelay == 0 {
+			return nil, E.New("`network_strategy` is conflict with `bind_interface`, `inet4_bind_address`, `inet6_bind_address` and `tcp_fast_open`")
 		}
 	}
-	if networkManager != nil && options.BindInterface == "" && options.Inet4BindAddress == nil && options.Inet6BindAddress == nil {
+
+	if networkManager != nil {
 		defaultOptions := networkManager.DefaultOptions()
-		if options.BindInterface == "" {
+		if !disableDefaultBind {
 			if defaultOptions.BindInterface != "" {
 				bindFunc := control.BindToInterface(networkManager.InterfaceFinder(), defaultOptions.BindInterface, -1)
 				dialer.Control = control.Append(dialer.Control, bindFunc)
 				listener.Control = control.Append(listener.Control, bindFunc)
 			} else if networkManager.AutoDetectInterface() {
-				if defaultOptions.NetworkStrategy != C.NetworkStrategyDefault && C.NetworkStrategy(options.NetworkStrategy) == C.NetworkStrategyDefault {
-					networkStrategy = defaultOptions.NetworkStrategy
-					networkType = defaultOptions.NetworkType
-					fallbackNetworkType = defaultOptions.FallbackNetworkType
-					networkFallbackDelay = defaultOptions.FallbackDelay
+				if platformInterface != nil {
+					networkStrategy = (*C.NetworkStrategy)(options.NetworkStrategy)
+					if networkStrategy == nil {
+						networkStrategy = common.Ptr(C.NetworkStrategyDefault)
+					}
+					networkType = common.Map(options.NetworkType, option.InterfaceType.Build)
+					fallbackNetworkType = common.Map(options.FallbackNetworkType, option.InterfaceType.Build)
+					if networkStrategy == nil && len(networkType) == 0 && len(fallbackNetworkType) == 0 {
+						networkStrategy = defaultOptions.NetworkStrategy
+						networkType = defaultOptions.NetworkType
+						fallbackNetworkType = defaultOptions.FallbackNetworkType
+					}
+					networkFallbackDelay = time.Duration(options.FallbackDelay)
+					if networkFallbackDelay == 0 && defaultOptions.FallbackDelay != 0 {
+						networkFallbackDelay = defaultOptions.FallbackDelay
+					}
 					bindFunc := networkManager.ProtectFunc()
 					dialer.Control = control.Append(dialer.Control, bindFunc)
 					listener.Control = control.Append(listener.Control, bindFunc)
@@ -172,9 +183,6 @@ func NewDefault(networkManager adapter.NetworkManager, options option.DialerOpti
 			listener.Control = control.Append(listener.Control, controlFn)
 		}
 	}
-	if networkStrategy != C.NetworkStrategyDefault && options.TCPFastOpen {
-		return nil, E.New("`tcp_fast_open` is conflict with `network_strategy` or `route.default_network_strategy`")
-	}
 	tcpDialer4, err := newTCPDialer(dialer4, options.TCPFastOpen)
 	if err != nil {
 		return nil, err
@@ -204,7 +212,7 @@ func (d *DefaultDialer) DialContext(ctx context.Context, network string, address
 	if !address.IsValid() {
 		return nil, E.New("invalid address")
 	}
-	if d.networkStrategy == C.NetworkStrategyDefault {
+	if d.networkStrategy == nil {
 		switch N.NetworkName(network) {
 		case N.NetworkUDP:
 			if !address.IsIPv6() {
@@ -223,12 +231,21 @@ func (d *DefaultDialer) DialContext(ctx context.Context, network string, address
 	}
 }
 
-func (d *DefaultDialer) DialParallelInterface(ctx context.Context, network string, address M.Socksaddr, strategy C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error) {
-	if strategy == C.NetworkStrategyDefault {
+func (d *DefaultDialer) DialParallelInterface(ctx context.Context, network string, address M.Socksaddr, strategy *C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error) {
+	if strategy == nil {
+		strategy = d.networkStrategy
+	}
+	if strategy == nil {
 		return d.DialContext(ctx, network, address)
 	}
-	if !d.networkManager.AutoDetectInterface() {
-		return nil, E.New("`route.auto_detect_interface` is require by `network_strategy`")
+	if len(interfaceType) == 0 {
+		interfaceType = d.networkType
+	}
+	if len(fallbackInterfaceType) == 0 {
+		fallbackInterfaceType = d.fallbackNetworkType
+	}
+	if fallbackDelay == 0 {
+		fallbackDelay = d.networkFallbackDelay
 	}
 	var dialer net.Dialer
 	if N.NetworkName(network) == N.NetworkTCP {
@@ -243,9 +260,9 @@ func (d *DefaultDialer) DialParallelInterface(ctx context.Context, network strin
 		err       error
 	)
 	if !fastFallback {
-		conn, isPrimary, err = d.dialParallelInterface(ctx, dialer, network, address.String(), strategy, interfaceType, fallbackInterfaceType, fallbackDelay)
+		conn, isPrimary, err = d.dialParallelInterface(ctx, dialer, network, address.String(), *strategy, interfaceType, fallbackInterfaceType, fallbackDelay)
 	} else {
-		conn, isPrimary, err = d.dialParallelInterfaceFastFallback(ctx, dialer, network, address.String(), strategy, interfaceType, fallbackInterfaceType, fallbackDelay, d.networkLastFallback.Store)
+		conn, isPrimary, err = d.dialParallelInterfaceFastFallback(ctx, dialer, network, address.String(), *strategy, interfaceType, fallbackInterfaceType, fallbackDelay, d.networkLastFallback.Store)
 	}
 	if err != nil {
 		return nil, err
@@ -257,7 +274,7 @@ func (d *DefaultDialer) DialParallelInterface(ctx context.Context, network strin
 }
 
 func (d *DefaultDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
-	if d.networkStrategy == C.NetworkStrategyDefault {
+	if d.networkStrategy == nil {
 		if destination.IsIPv6() {
 			return trackPacketConn(d.udpListener.ListenPacket(ctx, N.NetworkUDP, d.udpAddr6))
 		} else if destination.IsIPv4() && !destination.Addr.IsUnspecified() {
@@ -270,18 +287,27 @@ func (d *DefaultDialer) ListenPacket(ctx context.Context, destination M.Socksadd
 	}
 }
 
-func (d *DefaultDialer) ListenSerialInterfacePacket(ctx context.Context, destination M.Socksaddr, strategy C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.PacketConn, error) {
-	if strategy == C.NetworkStrategyDefault {
+func (d *DefaultDialer) ListenSerialInterfacePacket(ctx context.Context, destination M.Socksaddr, strategy *C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.PacketConn, error) {
+	if strategy == nil {
+		strategy = d.networkStrategy
+	}
+	if strategy == nil {
 		return d.ListenPacket(ctx, destination)
 	}
-	if !d.networkManager.AutoDetectInterface() {
-		return nil, E.New("`route.auto_detect_interface` is require by `network_strategy`")
+	if len(interfaceType) == 0 {
+		interfaceType = d.networkType
+	}
+	if len(fallbackInterfaceType) == 0 {
+		fallbackInterfaceType = d.fallbackNetworkType
+	}
+	if fallbackDelay == 0 {
+		fallbackDelay = d.networkFallbackDelay
 	}
 	network := N.NetworkUDP
 	if destination.IsIPv4() && !destination.Addr.IsUnspecified() {
 		network += "4"
 	}
-	return trackPacketConn(d.listenSerialInterfacePacket(ctx, d.udpListener, network, "", strategy, interfaceType, fallbackInterfaceType, fallbackDelay))
+	return trackPacketConn(d.listenSerialInterfacePacket(ctx, d.udpListener, network, "", *strategy, interfaceType, fallbackInterfaceType, fallbackDelay))
 }
 
 func (d *DefaultDialer) ListenPacketCompat(network, address string) (net.PacketConn, error) {

common/dialer/default_parallel_interface.go

@@ -40,7 +40,7 @@ func (d *DefaultDialer) dialParallelInterface(ctx context.Context, dialer net.Di
 			}
 		} else {
 			select {
-			case results <- dialResult{Conn: conn}:
+			case results <- dialResult{Conn: conn, primary: primary}:
 			case <-returned:
 				conn.Close()
 			}
@@ -112,7 +112,7 @@ func (d *DefaultDialer) dialParallelInterfaceFastFallback(ctx context.Context, d
 			}
 		} else {
 			select {
-			case results <- dialResult{Conn: conn}:
+			case results <- dialResult{Conn: conn, primary: primary}:
 			case <-returned:
 				if primary && time.Since(startAt) <= fallbackDelay {
 					resetFastFallback(time.Time{})
@@ -177,44 +177,57 @@ func selectInterfaces(networkManager adapter.NetworkManager, strategy C.NetworkS
 	case C.NetworkStrategyDefault:
 		if len(interfaceType) == 0 {
 			defaultIf := networkManager.InterfaceMonitor().DefaultInterface()
-			for _, iif := range interfaces {
-				if iif.Index == defaultIf.Index {
-					primaryInterfaces = append(primaryInterfaces, iif)
-				} else {
-					fallbackInterfaces = append(fallbackInterfaces, iif)
+			if defaultIf != nil {
+				for _, iif := range interfaces {
+					if iif.Index == defaultIf.Index {
+						primaryInterfaces = append(primaryInterfaces, iif)
+					}
 				}
+			} else {
+				primaryInterfaces = interfaces
 			}
 		} else {
-			primaryInterfaces = common.Filter(interfaces, func(iif adapter.NetworkInterface) bool {
-				return common.Contains(interfaceType, iif.Type)
+			primaryInterfaces = common.Filter(interfaces, func(it adapter.NetworkInterface) bool {
+				return common.Contains(interfaceType, it.Type)
 			})
 		}
 	case C.NetworkStrategyHybrid:
 		if len(interfaceType) == 0 {
 			primaryInterfaces = interfaces
 		} else {
-			primaryInterfaces = common.Filter(interfaces, func(iif adapter.NetworkInterface) bool {
-				return common.Contains(interfaceType, iif.Type)
+			primaryInterfaces = common.Filter(interfaces, func(it adapter.NetworkInterface) bool {
+				return common.Contains(interfaceType, it.Type)
 			})
 		}
 	case C.NetworkStrategyFallback:
 		if len(interfaceType) == 0 {
 			defaultIf := networkManager.InterfaceMonitor().DefaultInterface()
-			for _, iif := range interfaces {
-				if iif.Index == defaultIf.Index {
-					primaryInterfaces = append(primaryInterfaces, iif)
-				} else {
-					fallbackInterfaces = append(fallbackInterfaces, iif)
+			if defaultIf != nil {
+				for _, iif := range interfaces {
+					if iif.Index == defaultIf.Index {
+						primaryInterfaces = append(primaryInterfaces, iif)
+						break
+					}
 				}
+			} else {
+				primaryInterfaces = interfaces
 			}
 		} else {
-			primaryInterfaces = common.Filter(interfaces, func(iif adapter.NetworkInterface) bool {
-				return common.Contains(interfaceType, iif.Type)
+			primaryInterfaces = common.Filter(interfaces, func(it adapter.NetworkInterface) bool {
+				return common.Contains(interfaceType, it.Type)
+			})
+		}
+		if len(fallbackInterfaceType) == 0 {
+			fallbackInterfaces = common.Filter(interfaces, func(it adapter.NetworkInterface) bool {
+				return !common.Any(primaryInterfaces, func(iif adapter.NetworkInterface) bool {
+					return it.Index == iif.Index
+				})
+			})
+		} else {
+			fallbackInterfaces = common.Filter(interfaces, func(iif adapter.NetworkInterface) bool {
+				return common.Contains(fallbackInterfaceType, iif.Type)
 			})
 		}
-		fallbackInterfaces = common.Filter(interfaces, func(iif adapter.NetworkInterface) bool {
-			return common.Contains(fallbackInterfaceType, iif.Type)
-		})
 	}
 	return primaryInterfaces, fallbackInterfaces
 }

common/dialer/default_parallel_network.go

@@ -13,7 +13,13 @@ import (
 	N "github.com/sagernet/sing/common/network"
 )
 
-func DialSerialNetwork(ctx context.Context, dialer N.Dialer, network string, destination M.Socksaddr, destinationAddresses []netip.Addr, strategy C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error) {
+func DialSerialNetwork(ctx context.Context, dialer N.Dialer, network string, destination M.Socksaddr, destinationAddresses []netip.Addr, strategy *C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error) {
+	if len(destinationAddresses) == 0 {
+		if !destination.IsIP() {
+			panic("invalid usage")
+		}
+		destinationAddresses = []netip.Addr{destination.Addr}
+	}
 	if parallelDialer, isParallel := dialer.(ParallelNetworkDialer); isParallel {
 		return parallelDialer.DialParallelNetwork(ctx, network, destination, destinationAddresses, strategy, interfaceType, fallbackInterfaceType, fallbackDelay)
 	}
@@ -38,7 +44,14 @@ func DialSerialNetwork(ctx context.Context, dialer N.Dialer, network string, des
 	return nil, E.Errors(errors...)
 }
 
-func DialParallelNetwork(ctx context.Context, dialer ParallelInterfaceDialer, network string, destination M.Socksaddr, destinationAddresses []netip.Addr, preferIPv6 bool, strategy C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error) {
+func DialParallelNetwork(ctx context.Context, dialer ParallelInterfaceDialer, network string, destination M.Socksaddr, destinationAddresses []netip.Addr, preferIPv6 bool, strategy *C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error) {
+	if len(destinationAddresses) == 0 {
+		if !destination.IsIP() {
+			panic("invalid usage")
+		}
+		destinationAddresses = []netip.Addr{destination.Addr}
+	}
+
 	if fallbackDelay == 0 {
 		fallbackDelay = N.DefaultFallbackDelay
 	}
@@ -116,7 +129,13 @@ func DialParallelNetwork(ctx context.Context, dialer ParallelInterfaceDialer, ne
 	}
 }
 
-func ListenSerialNetworkPacket(ctx context.Context, dialer N.Dialer, destination M.Socksaddr, destinationAddresses []netip.Addr, strategy C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.PacketConn, netip.Addr, error) {
+func ListenSerialNetworkPacket(ctx context.Context, dialer N.Dialer, destination M.Socksaddr, destinationAddresses []netip.Addr, strategy *C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.PacketConn, netip.Addr, error) {
+	if len(destinationAddresses) == 0 {
+		if !destination.IsIP() {
+			panic("invalid usage")
+		}
+		destinationAddresses = []netip.Addr{destination.Addr}
+	}
 	if parallelDialer, isParallel := dialer.(ParallelNetworkDialer); isParallel {
 		return parallelDialer.ListenSerialNetworkPacket(ctx, destination, destinationAddresses, strategy, interfaceType, fallbackInterfaceType, fallbackDelay)
 	}

common/dialer/dialer.go

@@ -17,16 +17,15 @@ import (
 )
 
 func New(ctx context.Context, options option.DialerOptions) (N.Dialer, error) {
-	networkManager := service.FromContext[adapter.NetworkManager](ctx)
 	if options.IsWireGuardListener {
-		return NewDefault(networkManager, options)
+		return NewDefault(ctx, options)
 	}
 	var (
 		dialer N.Dialer
 		err    error
 	)
 	if options.Detour == "" {
-		dialer, err = NewDefault(networkManager, options)
+		dialer, err = NewDefault(ctx, options)
 		if err != nil {
 			return nil, err
 		}
@@ -37,9 +36,6 @@ func New(ctx context.Context, options option.DialerOptions) (N.Dialer, error) {
 		}
 		dialer = NewDetour(outboundManager, options.Detour)
 	}
-	if networkManager == nil {
-		return NewDefault(networkManager, options)
-	}
 	if options.Detour == "" {
 		router := service.FromContext[adapter.Router](ctx)
 		if router != nil {
@@ -58,11 +54,10 @@ func NewDirect(ctx context.Context, options option.DialerOptions) (ParallelInter
 	if options.Detour != "" {
 		return nil, E.New("`detour` is not supported in direct context")
 	}
-	networkManager := service.FromContext[adapter.NetworkManager](ctx)
 	if options.IsWireGuardListener {
-		return NewDefault(networkManager, options)
+		return NewDefault(ctx, options)
 	}
-	dialer, err := NewDefault(networkManager, options)
+	dialer, err := NewDefault(ctx, options)
 	if err != nil {
 		return nil, err
 	}
@@ -77,11 +72,11 @@ func NewDirect(ctx context.Context, options option.DialerOptions) (ParallelInter
 
 type ParallelInterfaceDialer interface {
 	N.Dialer
-	DialParallelInterface(ctx context.Context, network string, destination M.Socksaddr, strategy C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error)
-	ListenSerialInterfacePacket(ctx context.Context, destination M.Socksaddr, strategy C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.PacketConn, error)
+	DialParallelInterface(ctx context.Context, network string, destination M.Socksaddr, strategy *C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error)
+	ListenSerialInterfacePacket(ctx context.Context, destination M.Socksaddr, strategy *C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.PacketConn, error)
 }
 
 type ParallelNetworkDialer interface {
-	DialParallelNetwork(ctx context.Context, network string, destination M.Socksaddr, destinationAddresses []netip.Addr, strategy C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error)
-	ListenSerialNetworkPacket(ctx context.Context, destination M.Socksaddr, destinationAddresses []netip.Addr, strategy C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.PacketConn, netip.Addr, error)
+	DialParallelNetwork(ctx context.Context, network string, destination M.Socksaddr, destinationAddresses []netip.Addr, strategy *C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error)
+	ListenSerialNetworkPacket(ctx context.Context, destination M.Socksaddr, destinationAddresses []netip.Addr, strategy *C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.PacketConn, netip.Addr, error)
 }

common/dialer/resolve.go

@@ -106,7 +106,7 @@ func (d *resolveDialer) ListenPacket(ctx context.Context, destination M.Socksadd
 	return bufio.NewNATPacketConn(bufio.NewPacketConn(conn), M.SocksaddrFrom(destinationAddress, destination.Port), destination), nil
 }
 
-func (d *resolveParallelNetworkDialer) DialParallelInterface(ctx context.Context, network string, destination M.Socksaddr, strategy C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error) {
+func (d *resolveParallelNetworkDialer) DialParallelInterface(ctx context.Context, network string, destination M.Socksaddr, strategy *C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error) {
 	if !destination.IsFqdn() {
 		return d.dialer.DialContext(ctx, network, destination)
 	}
@@ -134,7 +134,7 @@ func (d *resolveParallelNetworkDialer) DialParallelInterface(ctx context.Context
 	}
 }
 
-func (d *resolveParallelNetworkDialer) ListenSerialInterfacePacket(ctx context.Context, destination M.Socksaddr, strategy C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.PacketConn, error) {
+func (d *resolveParallelNetworkDialer) ListenSerialInterfacePacket(ctx context.Context, destination M.Socksaddr, strategy *C.NetworkStrategy, interfaceType []C.InterfaceType, fallbackInterfaceType []C.InterfaceType, fallbackDelay time.Duration) (net.PacketConn, error) {
 	if !destination.IsFqdn() {
 		return d.dialer.ListenPacket(ctx, destination)
 	}

option/outbound.go

@@ -65,25 +65,24 @@ type DialerOptionsWrapper interface {
 }
 
 type DialerOptions struct {
-	Detour               string                            `json:"detour,omitempty"`
-	BindInterface        string                            `json:"bind_interface,omitempty"`
-	Inet4BindAddress     *badoption.Addr                   `json:"inet4_bind_address,omitempty"`
-	Inet6BindAddress     *badoption.Addr                   `json:"inet6_bind_address,omitempty"`
-	ProtectPath          string                            `json:"protect_path,omitempty"`
-	RoutingMark          FwMark                            `json:"routing_mark,omitempty"`
-	ReuseAddr            bool                              `json:"reuse_addr,omitempty"`
-	ConnectTimeout       badoption.Duration                `json:"connect_timeout,omitempty"`
-	TCPFastOpen          bool                              `json:"tcp_fast_open,omitempty"`
-	TCPMultiPath         bool                              `json:"tcp_multi_path,omitempty"`
-	UDPFragment          *bool                             `json:"udp_fragment,omitempty"`
-	UDPFragmentDefault   bool                              `json:"-"`
-	DomainStrategy       DomainStrategy                    `json:"domain_strategy,omitempty"`
-	NetworkStrategy      NetworkStrategy                   `json:"network_strategy,omitempty"`
-	NetworkType          badoption.Listable[InterfaceType] `json:"network_type,omitempty"`
-	FallbackNetworkType  badoption.Listable[InterfaceType] `json:"fallback_network_type,omitempty"`
-	FallbackDelay        badoption.Duration                `json:"fallback_delay,omitempty"`
-	NetworkFallbackDelay badoption.Duration                `json:"network_fallback_delay,omitempty"`
-	IsWireGuardListener  bool                              `json:"-"`
+	Detour              string                            `json:"detour,omitempty"`
+	BindInterface       string                            `json:"bind_interface,omitempty"`
+	Inet4BindAddress    *badoption.Addr                   `json:"inet4_bind_address,omitempty"`
+	Inet6BindAddress    *badoption.Addr                   `json:"inet6_bind_address,omitempty"`
+	ProtectPath         string                            `json:"protect_path,omitempty"`
+	RoutingMark         FwMark                            `json:"routing_mark,omitempty"`
+	ReuseAddr           bool                              `json:"reuse_addr,omitempty"`
+	ConnectTimeout      badoption.Duration                `json:"connect_timeout,omitempty"`
+	TCPFastOpen         bool                              `json:"tcp_fast_open,omitempty"`
+	TCPMultiPath        bool                              `json:"tcp_multi_path,omitempty"`
+	UDPFragment         *bool                             `json:"udp_fragment,omitempty"`
+	UDPFragmentDefault  bool                              `json:"-"`
+	DomainStrategy      DomainStrategy                    `json:"domain_strategy,omitempty"`
+	NetworkStrategy     *NetworkStrategy                  `json:"network_strategy,omitempty"`
+	NetworkType         badoption.Listable[InterfaceType] `json:"network_type,omitempty"`
+	FallbackNetworkType badoption.Listable[InterfaceType] `json:"fallback_network_type,omitempty"`
+	FallbackDelay       badoption.Duration                `json:"fallback_delay,omitempty"`
+	IsWireGuardListener bool                              `json:"-"`
 }
 
 func (o *DialerOptions) TakeDialerOptions() DialerOptions {

option/route.go

@@ -13,7 +13,7 @@ type RouteOptions struct {
 	OverrideAndroidVPN         bool                              `json:"override_android_vpn,omitempty"`
 	DefaultInterface           string                            `json:"default_interface,omitempty"`
 	DefaultMark                FwMark                            `json:"default_mark,omitempty"`
-	DefaultNetworkStrategy     NetworkStrategy                   `json:"default_network_strategy,omitempty"`
+	DefaultNetworkStrategy     *NetworkStrategy                  `json:"default_network_strategy,omitempty"`
 	DefaultNetworkType         badoption.Listable[InterfaceType] `json:"default_network_type,omitempty"`
 	DefaultFallbackNetworkType badoption.Listable[InterfaceType] `json:"default_fallback_network_type,omitempty"`
 	DefaultFallbackDelay       badoption.Duration                `json:"default_fallback_delay,omitempty"`

option/rule_action.go

@@ -145,8 +145,8 @@ type RawRouteOptionsActionOptions struct {
 	OverrideAddress string `json:"override_address,omitempty"`
 	OverridePort    uint16 `json:"override_port,omitempty"`
 
-	NetworkStrategy NetworkStrategy `json:"network_strategy,omitempty"`
-	FallbackDelay   uint32          `json:"fallback_delay,omitempty"`
+	NetworkStrategy *NetworkStrategy `json:"network_strategy,omitempty"`
+	FallbackDelay   uint32           `json:"fallback_delay,omitempty"`
 
 	UDPDisableDomainUnmapping bool               `json:"udp_disable_domain_unmapping,omitempty"`
 	UDPConnect                bool               `json:"udp_connect,omitempty"`

protocol/direct/outbound.go

@@ -32,16 +32,12 @@ var (
 
 type Outbound struct {
 	outbound.Adapter
-	logger               logger.ContextLogger
-	dialer               dialer.ParallelInterfaceDialer
-	domainStrategy       dns.DomainStrategy
-	fallbackDelay        time.Duration
-	networkStrategy      C.NetworkStrategy
-	networkType          []C.InterfaceType
-	fallbackNetworkType  []C.InterfaceType
-	networkFallbackDelay time.Duration
-	overrideOption       int
-	overrideDestination  M.Socksaddr
+	logger              logger.ContextLogger
+	dialer              dialer.ParallelInterfaceDialer
+	domainStrategy      dns.DomainStrategy
+	fallbackDelay       time.Duration
+	overrideOption      int
+	overrideDestination M.Socksaddr
 	// loopBack *loopBackDetector
 }
 
@@ -52,15 +48,11 @@ func NewOutbound(ctx context.Context, router adapter.Router, logger log.ContextL
 		return nil, err
 	}
 	outbound := &Outbound{
-		Adapter:              outbound.NewAdapterWithDialerOptions(C.TypeDirect, tag, []string{N.NetworkTCP, N.NetworkUDP}, options.DialerOptions),
-		logger:               logger,
-		domainStrategy:       dns.DomainStrategy(options.DomainStrategy),
-		fallbackDelay:        time.Duration(options.FallbackDelay),
-		networkStrategy:      C.NetworkStrategy(options.NetworkStrategy),
-		networkType:          common.Map(options.NetworkType, option.InterfaceType.Build),
-		fallbackNetworkType:  common.Map(options.FallbackNetworkType, option.InterfaceType.Build),
-		networkFallbackDelay: time.Duration(options.NetworkFallbackDelay),
-		dialer:               outboundDialer,
+		Adapter:        outbound.NewAdapterWithDialerOptions(C.TypeDirect, tag, []string{N.NetworkTCP, N.NetworkUDP}, options.DialerOptions),
+		logger:         logger,
+		domainStrategy: dns.DomainStrategy(options.DomainStrategy),
+		fallbackDelay:  time.Duration(options.FallbackDelay),
+		dialer:         outboundDialer,
 		// loopBack:       newLoopBackDetector(router),
 	}
 	//nolint:staticcheck
@@ -178,10 +170,10 @@ func (h *Outbound) DialParallel(ctx context.Context, network string, destination
 			return nil, E.New("no IPv6 address available for ", destination)
 		}
 	}
-	return dialer.DialParallelNetwork(ctx, h.dialer, network, destination, destinationAddresses, domainStrategy == dns.DomainStrategyPreferIPv6, h.networkStrategy, h.networkType, h.fallbackNetworkType, h.fallbackDelay)
+	return dialer.DialParallelNetwork(ctx, h.dialer, network, destination, destinationAddresses, domainStrategy == dns.DomainStrategyPreferIPv6, nil, nil, nil, h.fallbackDelay)
 }
 
-func (h *Outbound) DialParallelNetwork(ctx context.Context, network string, destination M.Socksaddr, destinationAddresses []netip.Addr, networkStrategy C.NetworkStrategy, networkType []C.InterfaceType, fallbackNetworkType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error) {
+func (h *Outbound) DialParallelNetwork(ctx context.Context, network string, destination M.Socksaddr, destinationAddresses []netip.Addr, networkStrategy *C.NetworkStrategy, networkType []C.InterfaceType, fallbackNetworkType []C.InterfaceType, fallbackDelay time.Duration) (net.Conn, error) {
 	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.Tag()
 	metadata.Destination = destination
@@ -221,7 +213,7 @@ func (h *Outbound) DialParallelNetwork(ctx context.Context, network string, dest
 	return dialer.DialParallelNetwork(ctx, h.dialer, network, destination, destinationAddresses, domainStrategy == dns.DomainStrategyPreferIPv6, networkStrategy, networkType, fallbackNetworkType, fallbackDelay)
 }
 
-func (h *Outbound) ListenSerialNetworkPacket(ctx context.Context, destination M.Socksaddr, destinationAddresses []netip.Addr, networkStrategy C.NetworkStrategy, networkType []C.InterfaceType, fallbackNetworkType []C.InterfaceType, fallbackDelay time.Duration) (net.PacketConn, netip.Addr, error) {
+func (h *Outbound) ListenSerialNetworkPacket(ctx context.Context, destination M.Socksaddr, destinationAddresses []netip.Addr, networkStrategy *C.NetworkStrategy, networkType []C.InterfaceType, fallbackNetworkType []C.InterfaceType, fallbackDelay time.Duration) (net.PacketConn, netip.Addr, error) {
 	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.Tag()
 	metadata.Destination = destination

protocol/wireguard/endpoint.go

@@ -20,7 +20,6 @@ import (
 	"github.com/sagernet/sing/common/logger"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
-	"github.com/sagernet/sing/service"
 )
 
 func RegisterEndpoint(registry *endpoint.Registry) {
@@ -70,7 +69,7 @@ func NewEndpoint(ctx context.Context, router adapter.Router, logger log.ContextL
 		UDPTimeout: udpTimeout,
 		Dialer:     outboundDialer,
 		CreateDialer: func(interfaceName string) N.Dialer {
-			return common.Must1(dialer.NewDefault(service.FromContext[adapter.NetworkManager](ctx), option.DialerOptions{
+			return common.Must1(dialer.NewDefault(ctx, option.DialerOptions{
 				BindInterface: interfaceName,
 			}))
 		},

protocol/wireguard/outbound.go

@@ -19,7 +19,6 @@ import (
 	"github.com/sagernet/sing/common/logger"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
-	"github.com/sagernet/sing/service"
 )
 
 func RegisterOutbound(registry *outbound.Registry) {
@@ -86,7 +85,7 @@ func NewOutbound(ctx context.Context, router adapter.Router, logger log.ContextL
 		System:  options.SystemInterface,
 		Dialer:  outboundDialer,
 		CreateDialer: func(interfaceName string) N.Dialer {
-			return common.Must1(dialer.NewDefault(service.FromContext[adapter.NetworkManager](ctx), option.DialerOptions{
+			return common.Must1(dialer.NewDefault(ctx, option.DialerOptions{
 				BindInterface: interfaceName,
 			}))
 		},

route/conn.go

@@ -56,7 +56,7 @@ func (m *ConnectionManager) NewConnection(ctx context.Context, this N.Dialer, co
 		remoteConn net.Conn
 		err        error
 	)
-	if len(metadata.DestinationAddresses) > 0 {
+	if len(metadata.DestinationAddresses) > 0 || metadata.Destination.IsIP() {
 		remoteConn, err = dialer.DialSerialNetwork(ctx, this, N.NetworkTCP, metadata.Destination, metadata.DestinationAddresses, metadata.NetworkStrategy, metadata.NetworkType, metadata.FallbackNetworkType, metadata.FallbackDelay)
 	} else {
 		remoteConn, err = this.DialContext(ctx, N.NetworkTCP, metadata.Destination)
@@ -97,12 +97,19 @@ func (m *ConnectionManager) NewPacketConnection(ctx context.Context, this N.Dial
 		err                error
 	)
 	if metadata.UDPConnect {
+		parallelDialer, isParallelDialer := this.(dialer.ParallelInterfaceDialer)
 		if len(metadata.DestinationAddresses) > 0 {
-			if parallelDialer, isParallelDialer := this.(dialer.ParallelInterfaceDialer); isParallelDialer {
+			if isParallelDialer {
 				remoteConn, err = dialer.DialSerialNetwork(ctx, parallelDialer, N.NetworkUDP, metadata.Destination, metadata.DestinationAddresses, metadata.NetworkStrategy, metadata.NetworkType, metadata.FallbackNetworkType, metadata.FallbackDelay)
 			} else {
 				remoteConn, err = N.DialSerial(ctx, this, N.NetworkUDP, metadata.Destination, metadata.DestinationAddresses)
 			}
+		} else if metadata.Destination.IsIP() {
+			if isParallelDialer {
+				remoteConn, err = dialer.DialSerialNetwork(ctx, parallelDialer, N.NetworkUDP, metadata.Destination, metadata.DestinationAddresses, metadata.NetworkStrategy, metadata.NetworkType, metadata.FallbackNetworkType, metadata.FallbackDelay)
+			} else {
+				remoteConn, err = this.DialContext(ctx, N.NetworkUDP, metadata.Destination)
+			}
 		} else {
 			remoteConn, err = this.DialContext(ctx, N.NetworkUDP, metadata.Destination)
 		}

route/network.go

@@ -62,7 +62,7 @@ func NewNetworkManager(ctx context.Context, logger logger.ContextLogger, routeOp
 		defaultOptions: adapter.NetworkOptions{
 			BindInterface:       routeOptions.DefaultInterface,
 			RoutingMark:         uint32(routeOptions.DefaultMark),
-			NetworkStrategy:     C.NetworkStrategy(routeOptions.DefaultNetworkStrategy),
+			NetworkStrategy:     (*C.NetworkStrategy)(routeOptions.DefaultNetworkStrategy),
 			NetworkType:         common.Map(routeOptions.DefaultNetworkType, option.InterfaceType.Build),
 			FallbackNetworkType: common.Map(routeOptions.DefaultFallbackNetworkType, option.InterfaceType.Build),
 			FallbackDelay:       time.Duration(routeOptions.DefaultFallbackDelay),
@@ -73,7 +73,7 @@ func NewNetworkManager(ctx context.Context, logger logger.ContextLogger, routeOp
 		inbound:           service.FromContext[adapter.InboundManager](ctx),
 		outbound:          service.FromContext[adapter.OutboundManager](ctx),
 	}
-	if C.NetworkStrategy(routeOptions.DefaultNetworkStrategy) != C.NetworkStrategyDefault {
+	if routeOptions.DefaultNetworkStrategy != nil {
 		if routeOptions.DefaultInterface != "" {
 			return nil, E.New("`default_network_strategy` is conflict with `default_interface`")
 		}

route/route.go

@@ -415,8 +415,18 @@ match:
 					Fqdn: metadata.Destination.Fqdn,
 				}
 			}
-			metadata.NetworkStrategy = routeOptions.NetworkStrategy
-			metadata.FallbackDelay = routeOptions.FallbackDelay
+			if routeOptions.NetworkStrategy != nil {
+				metadata.NetworkStrategy = routeOptions.NetworkStrategy
+			}
+			if len(routeOptions.NetworkType) > 0 {
+				metadata.NetworkType = routeOptions.NetworkType
+			}
+			if len(routeOptions.FallbackNetworkType) > 0 {
+				metadata.FallbackNetworkType = routeOptions.FallbackNetworkType
+			}
+			if routeOptions.FallbackDelay != 0 {
+				metadata.FallbackDelay = routeOptions.FallbackDelay
+			}
 			if routeOptions.UDPDisableDomainUnmapping {
 				metadata.UDPDisableDomainUnmapping = true
 			}

route/router.go

@@ -262,7 +262,7 @@ func NewRouter(ctx context.Context, logFactory log.Factory, options option.Route
 				Context: ctx,
 				Name:    "local",
 				Address: "local",
-				Dialer:  common.Must1(dialer.NewDefault(router.network, option.DialerOptions{})),
+				Dialer:  common.Must1(dialer.NewDefault(ctx, option.DialerOptions{})),
 			})))
 		}
 		defaultTransport = transports[0]

route/rule/rule_action.go

@@ -33,7 +33,7 @@ func NewRuleAction(ctx context.Context, logger logger.ContextLogger, action opti
 			RuleActionRouteOptions: RuleActionRouteOptions{
 				OverrideAddress:           M.ParseSocksaddrHostPort(action.RouteOptions.OverrideAddress, 0),
 				OverridePort:              action.RouteOptions.OverridePort,
-				NetworkStrategy:           C.NetworkStrategy(action.RouteOptions.NetworkStrategy),
+				NetworkStrategy:           (*C.NetworkStrategy)(action.RouteOptions.NetworkStrategy),
 				FallbackDelay:             time.Duration(action.RouteOptions.FallbackDelay),
 				UDPDisableDomainUnmapping: action.RouteOptions.UDPDisableDomainUnmapping,
 				UDPConnect:                action.RouteOptions.UDPConnect,
@@ -43,7 +43,7 @@ func NewRuleAction(ctx context.Context, logger logger.ContextLogger, action opti
 		return &RuleActionRouteOptions{
 			OverrideAddress:           M.ParseSocksaddrHostPort(action.RouteOptionsOptions.OverrideAddress, 0),
 			OverridePort:              action.RouteOptionsOptions.OverridePort,
-			NetworkStrategy:           C.NetworkStrategy(action.RouteOptionsOptions.NetworkStrategy),
+			NetworkStrategy:           (*C.NetworkStrategy)(action.RouteOptionsOptions.NetworkStrategy),
 			FallbackDelay:             time.Duration(action.RouteOptionsOptions.FallbackDelay),
 			UDPDisableDomainUnmapping: action.RouteOptionsOptions.UDPDisableDomainUnmapping,
 			UDPConnect:                action.RouteOptionsOptions.UDPConnect,
@@ -147,7 +147,7 @@ func (r *RuleActionRoute) String() string {
 type RuleActionRouteOptions struct {
 	OverrideAddress           M.Socksaddr
 	OverridePort              uint16
-	NetworkStrategy           C.NetworkStrategy
+	NetworkStrategy           *C.NetworkStrategy
 	NetworkType               []C.InterfaceType
 	FallbackNetworkType       []C.InterfaceType
 	FallbackDelay             time.Duration

transport/dhcp/server.go

@@ -253,7 +253,7 @@ func (t *Transport) recreateServers(iface *control.Interface, serverAddrs []neti
 			return it.String()
 		}), ","), "]")
 	}
-	serverDialer := common.Must1(dialer.NewDefault(t.networkManager, option.DialerOptions{
+	serverDialer := common.Must1(dialer.NewDefault(t.options.Context, option.DialerOptions{
 		BindInterface:      iface.Name,
 		UDPFragmentDefault: true,
 	}))