refactor: Platform Interfaces

adapter/network.go

@@ -9,6 +9,8 @@ type NetworkManager interface {
 	Lifecycle
 	InterfaceFinder() control.InterfaceFinder
 	UpdateInterfaces() error
+	DefaultNetworkInterface() *NetworkInterface
+	NetworkInterfaces() []NetworkInterface
 	DefaultInterface() string
 	AutoDetectInterface() bool
 	AutoDetectInterfaceFunc() control.Func
@@ -21,3 +23,20 @@ type NetworkManager interface {
 	WIFIState() WIFIState
 	ResetNetwork()
 }
+
+type InterfaceUpdateListener interface {
+	InterfaceUpdated()
+}
+
+type WIFIState struct {
+	SSID  string
+	BSSID string
+}
+
+type NetworkInterface struct {
+	control.Interface
+	Type        string
+	DNSServers  []string
+	Expensive   bool
+	Constrained bool
+}

adapter/router.go

@@ -119,12 +119,3 @@ func (c *HTTPStartContext) Close() {
 		client.CloseIdleConnections()
 	}
 }
-
-type InterfaceUpdateListener interface {
-	InterfaceUpdated()
-}
-
-type WIFIState struct {
-	SSID  string
-	BSSID string
-}

common/settings/proxy_darwin.go

@@ -2,7 +2,6 @@ package settings
 
 import (
 	"context"
-	"net/netip"
 	"strconv"
 	"strings"
 
@@ -77,14 +76,14 @@ func (p *DarwinSystemProxy) update(event int) {
 }
 
 func (p *DarwinSystemProxy) update0() error {
-	newInterfaceName := p.monitor.DefaultInterfaceName(netip.IPv4Unspecified())
-	if p.interfaceName == newInterfaceName {
+	newInterface := p.monitor.DefaultInterface()
+	if p.interfaceName == newInterface.Name {
 		return nil
 	}
 	if p.interfaceName != "" {
 		_ = p.Disable()
 	}
-	p.interfaceName = newInterfaceName
+	p.interfaceName = newInterface.Name
 	interfaceDisplayName, err := getInterfaceDisplayName(p.interfaceName)
 	if err != nil {
 		return err

constant/network.go

@@ -0,0 +1,8 @@
+package constant
+
+const (
+	InterfaceTypeWIFI     = "wifi"
+	InterfaceTypeCellular = "cellular"
+	InterfaceTypeEthernet = "ethernet"
+	InterfaceTypeOther    = "other"
+)

constant/os.go

@@ -6,7 +6,7 @@ import (
 
 const IsAndroid = goos.IsAndroid == 1
 
-const IsDarwin = goos.IsDarwin == 1
+const IsDarwin = goos.IsDarwin == 1 || goos.IsIos == 1
 
 const IsDragonfly = goos.IsDragonfly == 1
 

experimental/libbox/config.go

@@ -74,11 +74,7 @@ func (s *platformInterfaceStub) CreateDefaultInterfaceMonitor(logger logger.Logg
 	return (*interfaceMonitorStub)(nil)
 }
 
-func (s *platformInterfaceStub) UsePlatformInterfaceGetter() bool {
-	return true
-}
-
-func (s *platformInterfaceStub) Interfaces() ([]control.Interface, error) {
+func (s *platformInterfaceStub) Interfaces() ([]adapter.NetworkInterface, error) {
 	return nil, os.ErrInvalid
 }
 
@@ -111,16 +107,8 @@ func (s *interfaceMonitorStub) Close() error {
 	return os.ErrInvalid
 }
 
-func (s *interfaceMonitorStub) DefaultInterfaceName(destination netip.Addr) string {
-	return ""
-}
-
-func (s *interfaceMonitorStub) DefaultInterfaceIndex(destination netip.Addr) int {
-	return -1
-}
-
-func (s *interfaceMonitorStub) DefaultInterface(destination netip.Addr) (string, int) {
-	return "", -1
+func (s *interfaceMonitorStub) DefaultInterface() *control.Interface {
+	return nil
 }
 
 func (s *interfaceMonitorStub) OverrideAndroidVPN() bool {

experimental/libbox/link_flags_stub.go

@@ -1,4 +1,4 @@
-//go:build !linux
+//go:build !unix
 
 package libbox
 

experimental/libbox/link_flags_linux.go → experimental/libbox/link_flags_unix.go

@@ -1,3 +1,5 @@
+//go:build unix
+
 package libbox
 
 import (

experimental/libbox/monitor.go

@@ -1,16 +1,11 @@
 package libbox
 
 import (
-	"net"
-	"net/netip"
-	"sync"
-
 	C "github.com/sagernet/sing-box/constant"
 	"github.com/sagernet/sing-tun"
-	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/control"
 	E "github.com/sagernet/sing/common/exceptions"
 	"github.com/sagernet/sing/common/logger"
-	M "github.com/sagernet/sing/common/metadata"
 	"github.com/sagernet/sing/common/x/list"
 )
 
@@ -21,19 +16,9 @@ var (
 
 type platformDefaultInterfaceMonitor struct {
 	*platformInterfaceWrapper
-	networkAddresses      []networkAddress
-	defaultInterfaceName  string
-	defaultInterfaceIndex int
-	element               *list.Element[tun.NetworkUpdateCallback]
-	access                sync.Mutex
-	callbacks             list.List[tun.DefaultInterfaceUpdateCallback]
-	logger                logger.Logger
-}
-
-type networkAddress struct {
-	interfaceName  string
-	interfaceIndex int
-	addresses      []netip.Prefix
+	element   *list.Element[tun.NetworkUpdateCallback]
+	callbacks list.List[tun.DefaultInterfaceUpdateCallback]
+	logger    logger.Logger
 }
 
 func (m *platformDefaultInterfaceMonitor) Start() error {
@@ -44,37 +29,10 @@ func (m *platformDefaultInterfaceMonitor) Close() error {
 	return m.iif.CloseDefaultInterfaceMonitor(m)
 }
 
-func (m *platformDefaultInterfaceMonitor) DefaultInterfaceName(destination netip.Addr) string {
-	for _, address := range m.networkAddresses {
-		for _, prefix := range address.addresses {
-			if prefix.Contains(destination) {
-				return address.interfaceName
-			}
-		}
-	}
-	return m.defaultInterfaceName
-}
-
-func (m *platformDefaultInterfaceMonitor) DefaultInterfaceIndex(destination netip.Addr) int {
-	for _, address := range m.networkAddresses {
-		for _, prefix := range address.addresses {
-			if prefix.Contains(destination) {
-				return address.interfaceIndex
-			}
-		}
-	}
-	return m.defaultInterfaceIndex
-}
-
-func (m *platformDefaultInterfaceMonitor) DefaultInterface(destination netip.Addr) (string, int) {
-	for _, address := range m.networkAddresses {
-		for _, prefix := range address.addresses {
-			if prefix.Contains(destination) {
-				return address.interfaceName, address.interfaceIndex
-			}
-		}
-	}
-	return m.defaultInterfaceName, m.defaultInterfaceIndex
+func (m *platformDefaultInterfaceMonitor) DefaultInterface() *control.Interface {
+	m.defaultInterfaceAccess.Lock()
+	defer m.defaultInterfaceAccess.Unlock()
+	return m.defaultInterface
 }
 
 func (m *platformDefaultInterfaceMonitor) OverrideAndroidVPN() bool {
@@ -86,104 +44,57 @@ func (m *platformDefaultInterfaceMonitor) AndroidVPNEnabled() bool {
 }
 
 func (m *platformDefaultInterfaceMonitor) RegisterCallback(callback tun.DefaultInterfaceUpdateCallback) *list.Element[tun.DefaultInterfaceUpdateCallback] {
-	m.access.Lock()
-	defer m.access.Unlock()
+	m.defaultInterfaceAccess.Lock()
+	defer m.defaultInterfaceAccess.Unlock()
 	return m.callbacks.PushBack(callback)
 }
 
 func (m *platformDefaultInterfaceMonitor) UnregisterCallback(element *list.Element[tun.DefaultInterfaceUpdateCallback]) {
-	m.access.Lock()
-	defer m.access.Unlock()
+	m.defaultInterfaceAccess.Lock()
+	defer m.defaultInterfaceAccess.Unlock()
 	m.callbacks.Remove(element)
 }
 
-func (m *platformDefaultInterfaceMonitor) UpdateDefaultInterface(interfaceName string, interfaceIndex32 int32) {
+func (m *platformDefaultInterfaceMonitor) UpdateDefaultInterface(interfaceName string, interfaceIndex32 int32, isExpensive bool, isConstrained bool) {
 	if C.FixAndroidStack {
-		go m.updateDefaultInterface(interfaceName, interfaceIndex32)
+		go m.updateDefaultInterface(interfaceName, interfaceIndex32, isExpensive, isConstrained)
 	} else {
-		m.updateDefaultInterface(interfaceName, interfaceIndex32)
+		m.updateDefaultInterface(interfaceName, interfaceIndex32, isExpensive, isConstrained)
 	}
 }
 
-func (m *platformDefaultInterfaceMonitor) updateDefaultInterface(interfaceName string, interfaceIndex32 int32) {
-	if interfaceName == "" || interfaceIndex32 == -1 {
-		m.defaultInterfaceName = ""
-		m.defaultInterfaceIndex = -1
-		m.access.Lock()
+func (m *platformDefaultInterfaceMonitor) updateDefaultInterface(interfaceName string, interfaceIndex32 int32, isExpensive bool, isConstrained bool) {
+	m.isExpensive = isExpensive
+	m.isConstrained = isConstrained
+	err := m.networkManager.UpdateInterfaces()
+	if err != nil {
+		m.logger.Error(E.Cause(err, "update interfaces"))
+	}
+	m.defaultInterfaceAccess.Lock()
+	if interfaceIndex32 == -1 {
+		m.defaultInterface = nil
 		callbacks := m.callbacks.Array()
-		m.access.Unlock()
+		m.defaultInterfaceAccess.Unlock()
 		for _, callback := range callbacks {
-			callback(tun.EventNoRoute)
+			callback(tun.EventInterfaceUpdate)
 		}
 		return
 	}
-	var err error
-	if m.iif.UsePlatformInterfaceGetter() {
-		err = m.updateInterfacesPlatform()
-	} else {
-		err = m.updateInterfaces()
-	}
-	if err == nil {
-		err = m.networkManager.UpdateInterfaces()
-	}
+	oldInterface := m.defaultInterface
+	newInterface, err := m.networkManager.InterfaceFinder().ByIndex(int(interfaceIndex32))
 	if err != nil {
-		m.logger.Error(E.Cause(err, "update interfaces"))
+		m.defaultInterfaceAccess.Unlock()
+		m.logger.Error(E.Cause(err, "find updated interface: ", interfaceName))
+		return
 	}
-	interfaceIndex := int(interfaceIndex32)
-	if m.defaultInterfaceName == interfaceName && m.defaultInterfaceIndex == interfaceIndex {
+	m.defaultInterface = newInterface
+	if oldInterface != nil && oldInterface.Name == m.defaultInterface.Name && oldInterface.Index == m.defaultInterface.Index {
+		m.defaultInterfaceAccess.Unlock()
 		return
 	}
-	m.defaultInterfaceName = interfaceName
-	m.defaultInterfaceIndex = interfaceIndex
-	m.access.Lock()
 	callbacks := m.callbacks.Array()
-	m.access.Unlock()
+	m.defaultInterfaceAccess.Unlock()
 	for _, callback := range callbacks {
 		callback(tun.EventInterfaceUpdate)
 	}
 }
-
-func (m *platformDefaultInterfaceMonitor) updateInterfaces() error {
-	interfaces, err := net.Interfaces()
-	if err != nil {
-		return err
-	}
-	var addresses []networkAddress
-	for _, iif := range interfaces {
-		var netAddresses []net.Addr
-		netAddresses, err = iif.Addrs()
-		if err != nil {
-			return err
-		}
-		var address networkAddress
-		address.interfaceName = iif.Name
-		address.interfaceIndex = iif.Index
-		address.addresses = common.Map(common.FilterIsInstance(netAddresses, func(it net.Addr) (*net.IPNet, bool) {
-			value, loaded := it.(*net.IPNet)
-			return value, loaded
-		}), func(it *net.IPNet) netip.Prefix {
-			bits, _ := it.Mask.Size()
-			return netip.PrefixFrom(M.AddrFromIP(it.IP), bits)
-		})
-		addresses = append(addresses, address)
-	}
-	m.networkAddresses = addresses
-	return nil
-}
-
-func (m *platformDefaultInterfaceMonitor) updateInterfacesPlatform() error {
-	interfaces, err := m.Interfaces()
-	if err != nil {
-		return err
-	}
-	var addresses []networkAddress
-	for _, iif := range interfaces {
-		var address networkAddress
-		address.interfaceName = iif.Name
-		address.interfaceIndex = iif.Index
-		// address.addresses = common.Map(iif.Addresses, netip.MustParsePrefix)
-		addresses = append(addresses, address)
-	}
-	m.networkAddresses = addresses
-	return nil
-}

experimental/libbox/platform.go

@@ -1,6 +1,7 @@
 package libbox
 
 import (
+	C "github.com/sagernet/sing-box/constant"
 	"github.com/sagernet/sing-box/option"
 )
 
@@ -13,10 +14,8 @@ type PlatformInterface interface {
 	FindConnectionOwner(ipProtocol int32, sourceAddress string, sourcePort int32, destinationAddress string, destinationPort int32) (int32, error)
 	PackageNameByUid(uid int32) (string, error)
 	UIDByPackageName(packageName string) (int32, error)
-	UsePlatformDefaultInterfaceMonitor() bool
 	StartDefaultInterfaceMonitor(listener InterfaceUpdateListener) error
 	CloseDefaultInterfaceMonitor(listener InterfaceUpdateListener) error
-	UsePlatformInterfaceGetter() bool
 	GetInterfaces() (NetworkInterfaceIterator, error)
 	UnderNetworkExtension() bool
 	IncludeAllNetworks() bool
@@ -31,15 +30,26 @@ type TunInterface interface {
 }
 
 type InterfaceUpdateListener interface {
-	UpdateDefaultInterface(interfaceName string, interfaceIndex int32)
+	UpdateDefaultInterface(interfaceName string, interfaceIndex int32, isExpensive bool, isConstrained bool)
 }
 
+const (
+	InterfaceTypeWIFI     = C.InterfaceTypeWIFI
+	InterfaceTypeCellular = C.InterfaceTypeCellular
+	InterfaceTypeEthernet = C.InterfaceTypeEthernet
+	InterfaceTypeOther    = C.InterfaceTypeOther
+)
+
 type NetworkInterface struct {
 	Index     int32
 	MTU       int32
 	Name      string
 	Addresses StringIterator
 	Flags     int32
+
+	Type      string
+	DNSServer StringIterator
+	Metered   bool
 }
 
 type WIFIState struct {

experimental/libbox/platform/interface.go

@@ -5,7 +5,6 @@ import (
 	"github.com/sagernet/sing-box/common/process"
 	"github.com/sagernet/sing-box/option"
 	"github.com/sagernet/sing-tun"
-	"github.com/sagernet/sing/common/control"
 	"github.com/sagernet/sing/common/logger"
 )
 
@@ -14,10 +13,8 @@ type Interface interface {
 	UsePlatformAutoDetectInterfaceControl() bool
 	AutoDetectInterfaceControl(fd int) error
 	OpenTun(options *tun.Options, platformOptions option.TunPlatformOptions) (tun.Tun, error)
-	UsePlatformDefaultInterfaceMonitor() bool
 	CreateDefaultInterfaceMonitor(logger logger.Logger) tun.DefaultInterfaceMonitor
-	UsePlatformInterfaceGetter() bool
-	Interfaces() ([]control.Interface, error)
+	Interfaces() ([]adapter.NetworkInterface, error)
 	UnderNetworkExtension() bool
 	IncludeAllNetworks() bool
 	ClearDNSCache()

experimental/libbox/service.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"runtime"
 	runtimeDebug "runtime/debug"
+	"sync"
 	"syscall"
 	"time"
 
@@ -54,7 +55,10 @@ func NewService(configContent string, platformInterface PlatformInterface) (*Box
 	ctx, cancel := context.WithCancel(ctx)
 	urlTestHistoryStorage := urltest.NewHistoryStorage()
 	ctx = service.ContextWithPtr(ctx, urlTestHistoryStorage)
-	platformWrapper := &platformInterfaceWrapper{iif: platformInterface, useProcFS: platformInterface.UseProcFS()}
+	platformWrapper := &platformInterfaceWrapper{
+		iif:       platformInterface,
+		useProcFS: platformInterface.UseProcFS(),
+	}
 	service.MustRegister[platform.Interface](ctx, platformWrapper)
 	instance, err := box.New(box.Options{
 		Context:           ctx,
@@ -119,9 +123,14 @@ var (
 )
 
 type platformInterfaceWrapper struct {
-	iif            PlatformInterface
-	useProcFS      bool
-	networkManager adapter.NetworkManager
+	iif                    PlatformInterface
+	useProcFS              bool
+	networkManager         adapter.NetworkManager
+	myTunName              string
+	defaultInterfaceAccess sync.Mutex
+	defaultInterface       *control.Interface
+	isExpensive            bool
+	isConstrained          bool
 }
 
 func (w *platformInterfaceWrapper) Initialize(networkManager adapter.NetworkManager) error {
@@ -161,38 +170,42 @@ func (w *platformInterfaceWrapper) OpenTun(options *tun.Options, platformOptions
 		return nil, E.Cause(err, "dup tun file descriptor")
 	}
 	options.FileDescriptor = dupFd
+	w.myTunName = options.Name
 	return tun.New(*options)
 }
 
-func (w *platformInterfaceWrapper) UsePlatformDefaultInterfaceMonitor() bool {
-	return w.iif.UsePlatformDefaultInterfaceMonitor()
-}
-
 func (w *platformInterfaceWrapper) CreateDefaultInterfaceMonitor(logger logger.Logger) tun.DefaultInterfaceMonitor {
 	return &platformDefaultInterfaceMonitor{
 		platformInterfaceWrapper: w,
-		defaultInterfaceIndex:    -1,
 		logger:                   logger,
 	}
 }
 
-func (w *platformInterfaceWrapper) UsePlatformInterfaceGetter() bool {
-	return w.iif.UsePlatformInterfaceGetter()
-}
-
-func (w *platformInterfaceWrapper) Interfaces() ([]control.Interface, error) {
+func (w *platformInterfaceWrapper) Interfaces() ([]adapter.NetworkInterface, error) {
 	interfaceIterator, err := w.iif.GetInterfaces()
 	if err != nil {
 		return nil, err
 	}
-	var interfaces []control.Interface
+	var interfaces []adapter.NetworkInterface
 	for _, netInterface := range iteratorToArray[*NetworkInterface](interfaceIterator) {
-		interfaces = append(interfaces, control.Interface{
-			Index:     int(netInterface.Index),
-			MTU:       int(netInterface.MTU),
-			Name:      netInterface.Name,
-			Addresses: common.Map(iteratorToArray[string](netInterface.Addresses), netip.MustParsePrefix),
-			Flags:     linkFlags(uint32(netInterface.Flags)),
+		if netInterface.Name == w.myTunName {
+			continue
+		}
+		w.defaultInterfaceAccess.Lock()
+		isDefault := w.defaultInterface != nil && int(netInterface.Index) == w.defaultInterface.Index
+		w.defaultInterfaceAccess.Unlock()
+		interfaces = append(interfaces, adapter.NetworkInterface{
+			Interface: control.Interface{
+				Index:     int(netInterface.Index),
+				MTU:       int(netInterface.MTU),
+				Name:      netInterface.Name,
+				Addresses: common.Map(iteratorToArray[string](netInterface.Addresses), netip.MustParsePrefix),
+				Flags:     linkFlags(uint32(netInterface.Flags)),
+			},
+			Type:        netInterface.Type,
+			DNSServers:  iteratorToArray[string](netInterface.DNSServer),
+			Expensive:   netInterface.Metered || isDefault && w.isExpensive,
+			Constrained: isDefault && w.isConstrained,
 		})
 	}
 	return interfaces, nil

protocol/direct/loopback_detect.go

@@ -33,7 +33,7 @@ func (l *loopBackDetector) NewConn(conn net.Conn) net.Conn {
 	}
 	if udpConn, isUDPConn := conn.(abstractUDPConn); isUDPConn {
 		if !source.Addr().IsLoopback() {
-			_, err := l.networkManager.InterfaceFinder().InterfaceByAddr(source.Addr())
+			_, err := l.networkManager.InterfaceFinder().ByAddr(source.Addr())
 			if err != nil {
 				return conn
 			}
@@ -59,7 +59,7 @@ func (l *loopBackDetector) NewPacketConn(conn N.NetPacketConn, destination M.Soc
 		return conn
 	}
 	if !source.Addr().IsLoopback() {
-		_, err := l.networkManager.InterfaceFinder().InterfaceByAddr(source.Addr())
+		_, err := l.networkManager.InterfaceFinder().ByAddr(source.Addr())
 		if err != nil {
 			return conn
 		}
@@ -82,7 +82,7 @@ func (l *loopBackDetector) CheckPacketConn(source netip.AddrPort, local netip.Ad
 		return false
 	}
 	if !source.Addr().IsLoopback() {
-		_, err := l.networkManager.InterfaceFinder().InterfaceByAddr(source.Addr())
+		_, err := l.networkManager.InterfaceFinder().ByAddr(source.Addr())
 		if err != nil {
 			return false
 		}

route/network.go

@@ -3,9 +3,10 @@ package route
 import (
 	"context"
 	"errors"
-	"net/netip"
+	"net"
 	"os"
 	"runtime"
+	"strings"
 	"syscall"
 
 	"github.com/sagernet/sing-box/adapter"
@@ -15,33 +16,41 @@ import (
 	"github.com/sagernet/sing-box/experimental/libbox/platform"
 	"github.com/sagernet/sing-box/option"
 	"github.com/sagernet/sing-tun"
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/atomic"
 	"github.com/sagernet/sing/common/control"
 	E "github.com/sagernet/sing/common/exceptions"
+	F "github.com/sagernet/sing/common/format"
 	"github.com/sagernet/sing/common/logger"
 	M "github.com/sagernet/sing/common/metadata"
 	"github.com/sagernet/sing/common/winpowrprof"
 	"github.com/sagernet/sing/service"
 	"github.com/sagernet/sing/service/pause"
+
+	"golang.org/x/exp/slices"
 )
 
 var _ adapter.NetworkManager = (*NetworkManager)(nil)
 
 type NetworkManager struct {
-	logger                 logger.ContextLogger
-	interfaceFinder        *control.DefaultInterfaceFinder
+	logger            logger.ContextLogger
+	interfaceFinder   *control.DefaultInterfaceFinder
+	networkInterfaces atomic.TypedValue[[]adapter.NetworkInterface]
+
 	autoDetectInterface    bool
 	defaultInterface       string
 	defaultMark            uint32
 	autoRedirectOutputMark uint32
-	networkMonitor         tun.NetworkUpdateMonitor
-	interfaceMonitor       tun.DefaultInterfaceMonitor
-	packageManager         tun.PackageManager
-	powerListener          winpowrprof.EventListener
-	pauseManager           pause.Manager
-	platformInterface      platform.Interface
-	outboundManager        adapter.OutboundManager
-	wifiState              adapter.WIFIState
-	started                bool
+
+	networkMonitor    tun.NetworkUpdateMonitor
+	interfaceMonitor  tun.DefaultInterfaceMonitor
+	packageManager    tun.PackageManager
+	powerListener     winpowrprof.EventListener
+	pauseManager      pause.Manager
+	platformInterface platform.Interface
+	outboundManager   adapter.OutboundManager
+	wifiState         adapter.WIFIState
+	started           bool
 }
 
 func NewNetworkManager(ctx context.Context, logger logger.ContextLogger, routeOptions option.RouteOptions) (*NetworkManager, error) {
@@ -55,7 +64,7 @@ func NewNetworkManager(ctx context.Context, logger logger.ContextLogger, routeOp
 		platformInterface:   service.FromContext[platform.Interface](ctx),
 		outboundManager:     service.FromContext[adapter.OutboundManager](ctx),
 	}
-	usePlatformDefaultInterfaceMonitor := nm.platformInterface != nil && nm.platformInterface.UsePlatformDefaultInterfaceMonitor()
+	usePlatformDefaultInterfaceMonitor := nm.platformInterface != nil
 	enforceInterfaceMonitor := routeOptions.AutoDetectInterface
 	if !usePlatformDefaultInterfaceMonitor {
 		networkMonitor, err := tun.NewNetworkUpdateMonitor(logger)
@@ -90,17 +99,17 @@ func (r *NetworkManager) Start(stage adapter.StartStage) error {
 	monitor := taskmonitor.New(r.logger, C.StartTimeout)
 	switch stage {
 	case adapter.StartStateInitialize:
-		if r.interfaceMonitor != nil {
-			monitor.Start("initialize interface monitor")
-			err := r.interfaceMonitor.Start()
+		if r.networkMonitor != nil {
+			monitor.Start("initialize network monitor")
+			err := r.networkMonitor.Start()
 			monitor.Finish()
 			if err != nil {
 				return err
 			}
 		}
-		if r.networkMonitor != nil {
-			monitor.Start("initialize network monitor")
-			err := r.networkMonitor.Start()
+		if r.interfaceMonitor != nil {
+			monitor.Start("initialize interface monitor")
+			err := r.interfaceMonitor.Start()
 			monitor.Finish()
 			if err != nil {
 				return err
@@ -151,20 +160,6 @@ func (r *NetworkManager) Start(stage adapter.StartStage) error {
 func (r *NetworkManager) Close() error {
 	monitor := taskmonitor.New(r.logger, C.StopTimeout)
 	var err error
-	if r.interfaceMonitor != nil {
-		monitor.Start("close interface monitor")
-		err = E.Append(err, r.interfaceMonitor.Close(), func(err error) error {
-			return E.Cause(err, "close interface monitor")
-		})
-		monitor.Finish()
-	}
-	if r.networkMonitor != nil {
-		monitor.Start("close network monitor")
-		err = E.Append(err, r.networkMonitor.Close(), func(err error) error {
-			return E.Cause(err, "close network monitor")
-		})
-		monitor.Finish()
-	}
 	if r.packageManager != nil {
 		monitor.Start("close package manager")
 		err = E.Append(err, r.packageManager.Close(), func(err error) error {
@@ -179,6 +174,20 @@ func (r *NetworkManager) Close() error {
 		})
 		monitor.Finish()
 	}
+	if r.interfaceMonitor != nil {
+		monitor.Start("close interface monitor")
+		err = E.Append(err, r.interfaceMonitor.Close(), func(err error) error {
+			return E.Cause(err, "close interface monitor")
+		})
+		monitor.Finish()
+	}
+	if r.networkMonitor != nil {
+		monitor.Start("close network monitor")
+		err = E.Append(err, r.networkMonitor.Close(), func(err error) error {
+			return E.Cause(err, "close network monitor")
+		})
+		monitor.Finish()
+	}
 	return nil
 }
 
@@ -187,18 +196,75 @@ func (r *NetworkManager) InterfaceFinder() control.InterfaceFinder {
 }
 
 func (r *NetworkManager) UpdateInterfaces() error {
-	if r.platformInterface == nil || !r.platformInterface.UsePlatformInterfaceGetter() {
+	if r.platformInterface == nil {
 		return r.interfaceFinder.Update()
 	} else {
 		interfaces, err := r.platformInterface.Interfaces()
 		if err != nil {
 			return err
 		}
-		r.interfaceFinder.UpdateInterfaces(interfaces)
+		if C.IsDarwin {
+			err = r.interfaceFinder.Update()
+			if err != nil {
+				return err
+			}
+			// NEInterface only provides name,index and type
+			interfaces = common.Map(interfaces, func(it adapter.NetworkInterface) adapter.NetworkInterface {
+				iif, _ := r.interfaceFinder.ByIndex(it.Index)
+				if iif != nil {
+					it.Interface = *iif
+				}
+				return it
+			})
+		} else {
+			r.interfaceFinder.UpdateInterfaces(common.Map(interfaces, func(it adapter.NetworkInterface) control.Interface { return it.Interface }))
+		}
+		oldInterfaces := r.networkInterfaces.Load()
+		newInterfaces := common.Filter(interfaces, func(it adapter.NetworkInterface) bool {
+			return it.Flags&net.FlagUp != 0
+		})
+		r.networkInterfaces.Store(newInterfaces)
+		if len(newInterfaces) > 0 && !slices.EqualFunc(oldInterfaces, newInterfaces, func(oldInterface adapter.NetworkInterface, newInterface adapter.NetworkInterface) bool {
+			return oldInterface.Interface.Index == newInterface.Interface.Index &&
+				oldInterface.Interface.Name == newInterface.Interface.Name &&
+				oldInterface.Interface.Flags == newInterface.Interface.Flags &&
+				oldInterface.Type == newInterface.Type &&
+				oldInterface.Expensive == newInterface.Expensive &&
+				oldInterface.Constrained == newInterface.Constrained
+		}) {
+			r.logger.Info("updated available networks: ", strings.Join(common.Map(newInterfaces, func(it adapter.NetworkInterface) string {
+				var options []string
+				options = append(options, F.ToString(it.Type))
+				if it.Expensive {
+					options = append(options, "expensive")
+				}
+				if it.Constrained {
+					options = append(options, "constrained")
+				}
+				return F.ToString(it.Name, " (", strings.Join(options, ", "), ")")
+			}), ", "))
+		}
 		return nil
 	}
 }
 
+func (r *NetworkManager) DefaultNetworkInterface() *adapter.NetworkInterface {
+	iif := r.interfaceMonitor.DefaultInterface()
+	if iif == nil {
+		return nil
+	}
+	for _, it := range r.networkInterfaces.Load() {
+		if it.Interface.Index == iif.Index {
+			return &it
+		}
+	}
+	return &adapter.NetworkInterface{Interface: *iif}
+}
+
+func (r *NetworkManager) NetworkInterfaces() []adapter.NetworkInterface {
+	return r.networkInterfaces.Load()
+}
+
 func (r *NetworkManager) DefaultInterface() string {
 	return r.defaultInterface
 }
@@ -220,18 +286,17 @@ func (r *NetworkManager) AutoDetectInterfaceFunc() control.Func {
 		}
 		return control.BindToInterfaceFunc(r.interfaceFinder, func(network string, address string) (interfaceName string, interfaceIndex int, err error) {
 			remoteAddr := M.ParseSocksaddr(address).Addr
-			if C.IsLinux {
-				interfaceName, interfaceIndex = r.interfaceMonitor.DefaultInterface(remoteAddr)
-				if interfaceIndex == -1 {
-					err = tun.ErrNoRoute
-				}
-			} else {
-				interfaceIndex = r.interfaceMonitor.DefaultInterfaceIndex(remoteAddr)
-				if interfaceIndex == -1 {
-					err = tun.ErrNoRoute
+			if remoteAddr.IsValid() {
+				iif, err := r.interfaceFinder.ByAddr(remoteAddr)
+				if err == nil {
+					return iif.Name, iif.Index, nil
 				}
 			}
-			return
+			defaultInterface := r.interfaceMonitor.DefaultInterface()
+			if defaultInterface == nil {
+				return "", -1, tun.ErrNoRoute
+			}
+			return defaultInterface.Name, defaultInterface.Index, nil
 		})
 	}
 }
@@ -285,6 +350,12 @@ func (r *NetworkManager) notifyNetworkUpdate(event int) {
 		r.logger.Error("missing default interface")
 	} else {
 		r.pauseManager.NetworkWake()
+		defaultInterface := r.DefaultNetworkInterface()
+		if defaultInterface == nil {
+			panic("invalid interface context")
+		}
+		var options []string
+		options = append(options, F.ToString("index ", defaultInterface.Index))
 		if C.IsAndroid && r.platformInterface == nil {
 			var vpnStatus string
 			if r.interfaceMonitor.AndroidVPNEnabled() {
@@ -292,17 +363,24 @@ func (r *NetworkManager) notifyNetworkUpdate(event int) {
 			} else {
 				vpnStatus = "disabled"
 			}
-			r.logger.Info("updated default interface ", r.interfaceMonitor.DefaultInterfaceName(netip.IPv4Unspecified()), ", index ", r.interfaceMonitor.DefaultInterfaceIndex(netip.IPv4Unspecified()), ", vpn ", vpnStatus)
+			options = append(options, "vpn "+vpnStatus)
 		} else {
-			r.logger.Info("updated default interface ", r.interfaceMonitor.DefaultInterfaceName(netip.IPv4Unspecified()), ", index ", r.interfaceMonitor.DefaultInterfaceIndex(netip.IPv4Unspecified()))
+			if defaultInterface.Type != "" {
+				options = append(options, F.ToString("type ", defaultInterface.Type))
+			}
+			if defaultInterface.Expensive {
+				options = append(options, "expensive")
+			}
+			if defaultInterface.Constrained {
+				options = append(options, "constrained")
+			}
 		}
+		r.logger.Info("updated default interface ", defaultInterface.Name, ", ", strings.Join(options, ", "))
 		if r.platformInterface != nil {
 			state := r.platformInterface.ReadWIFIState()
 			if state != r.wifiState {
 				r.wifiState = state
-				if state.SSID == "" && state.BSSID == "" {
-					r.logger.Info("updated WIFI state: disconnected")
-				} else {
+				if state.SSID != "" {
 					r.logger.Info("updated WIFI state: SSID=", state.SSID, ", BSSID=", state.BSSID)
 				}
 			}
@@ -312,7 +390,6 @@ func (r *NetworkManager) notifyNetworkUpdate(event int) {
 	if !r.started {
 		return
 	}
-
 	r.ResetNetwork()
 }
 

transport/dhcp/server.go

@@ -119,18 +119,19 @@ func (t *Transport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg,
 	return nil, err
 }
 
-func (t *Transport) fetchInterface() (*net.Interface, error) {
-	interfaceName := t.interfaceName
+func (t *Transport) fetchInterface() (*control.Interface, error) {
 	if t.autoInterface {
 		if t.networkManager.InterfaceMonitor() == nil {
 			return nil, E.New("missing monitor for auto DHCP, set route.auto_detect_interface")
 		}
-		interfaceName = t.networkManager.InterfaceMonitor().DefaultInterfaceName(netip.Addr{})
-	}
-	if interfaceName == "" {
-		return nil, E.New("missing default interface")
+		defaultInterface := t.networkManager.InterfaceMonitor().DefaultInterface()
+		if defaultInterface == nil {
+			return nil, E.New("missing default interface")
+		}
+		return defaultInterface, nil
+	} else {
+		return t.networkManager.InterfaceFinder().ByName(t.interfaceName)
 	}
-	return net.InterfaceByName(interfaceName)
 }
 
 func (t *Transport) fetchServers() error {
@@ -172,7 +173,7 @@ func (t *Transport) interfaceUpdated(int) {
 	}
 }
 
-func (t *Transport) fetchServers0(ctx context.Context, iface *net.Interface) error {
+func (t *Transport) fetchServers0(ctx context.Context, iface *control.Interface) error {
 	var listener net.ListenConfig
 	listener.Control = control.Append(listener.Control, control.BindToInterface(t.networkManager.InterfaceFinder(), iface.Name, iface.Index))
 	listener.Control = control.Append(listener.Control, control.ReuseAddr())
@@ -206,7 +207,7 @@ func (t *Transport) fetchServers0(ctx context.Context, iface *net.Interface) err
 	return group.Run(ctx)
 }
 
-func (t *Transport) fetchServersResponse(iface *net.Interface, packetConn net.PacketConn, transactionID dhcpv4.TransactionID) error {
+func (t *Transport) fetchServersResponse(iface *control.Interface, packetConn net.PacketConn, transactionID dhcpv4.TransactionID) error {
 	buffer := buf.NewSize(dhcpv4.MaxMessageSize)
 	defer buffer.Release()
 
@@ -246,7 +247,7 @@ func (t *Transport) fetchServersResponse(iface *net.Interface, packetConn net.Pa
 	}
 }
 
-func (t *Transport) recreateServers(iface *net.Interface, serverAddrs []netip.Addr) error {
+func (t *Transport) recreateServers(iface *control.Interface, serverAddrs []netip.Addr) error {
 	if len(serverAddrs) > 0 {
 		t.options.Logger.Info("dhcp: updated DNS servers from ", iface.Name, ": [", strings.Join(common.Map(serverAddrs, func(it netip.Addr) string {
 			return it.String()