Bind implementation (#779)

This PR adds supports for the WireGuard userspace implementation
using Bind interface from wireguard-go. 
The newly introduced ICEBind struct implements Bind with UDPMux-based
structs from pion/ice to handle hole punching using ICE.
The core implementation was taken from StdBind of wireguard-go.

The result is a single WireGuard port that is used for host and server reflexive candidates. 
Relay candidates are still handled separately and will be integrated in the following PRs.

ICEBind checks the incoming packets for being STUN or WireGuard ones
and routes them to UDPMux (to handle hole punching) or to WireGuard  respectively.

.github/workflows/golang-test-darwin.yml

@@ -6,6 +6,10 @@ on:
       - main
   pull_request:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.head_ref || github.actor_id }}
+  cancel-in-progress: true
+
 jobs:
   test:
     runs-on: macos-latest

.github/workflows/golang-test-linux.yml

@@ -6,6 +6,10 @@ on:
       - main
   pull_request:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.head_ref || github.actor_id }}
+  cancel-in-progress: true
+
 jobs:
   test:
     strategy:
@@ -66,7 +70,7 @@ jobs:
         run: go mod tidy
 
       - name: Generate Iface Test bin
-        run: go test -c -o iface-testing.bin ./iface/...
+        run: go test -c -o iface-testing.bin ./iface/
 
       - name: Generate RouteManager Test bin
         run: go test -c -o routemanager-testing.bin ./client/internal/routemanager/...

.github/workflows/golang-test-windows.yml

@@ -6,47 +6,45 @@ on:
       - main
   pull_request:
 
+env:
+  downloadPath: '${{ github.workspace }}\temp'
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.head_ref || github.actor_id }}
+  cancel-in-progress: true
+
 jobs:
-  pre:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v2
-      - run: bash -x wireguard_nt.sh
-        working-directory: client
-
-      - uses: actions/upload-artifact@v2
-        with:
-          name: syso
-          path: client/*.syso
-          retention-days: 1
-
   test:
-    needs: pre
     runs-on: windows-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Install Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v4
+        id: go
         with:
           go-version: 1.19.x
 
-      - uses: actions/cache@v2
+      - name: Download wintun
+        uses: carlosperate/download-file-action@v2
+        id: download-wintun
         with:
-          path: |
+          file-url: https://www.wintun.net/builds/wintun-0.14.1.zip
-            %LocalAppData%\go-build
+          file-name: wintun.zip
-            ~\go\pkg\mod
+          location: ${{ env.downloadPath }}
-            ~\AppData\Local\go-build
+          sha256: '07c256185d6ee3652e09fa55c0b673e2624b565e02c4b9091c79ca7d2f24ef51'
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-
 
-      - uses: actions/download-artifact@v2
+      - name: Decompressing wintun files
-        with:
+        run: tar -zvxf "${{ steps.download-wintun.outputs.file-path }}" -C ${{ env.downloadPath }}
-          name: syso
-          path: iface\
 
-      - name: Test
+      - run: mv ${{ env.downloadPath }}/wintun/bin/amd64/wintun.dll 'C:\Windows\System32\'
-        run: go test -tags=load_wgnt_from_rsrc -timeout 5m -p 1 ./...
+
+      - run: choco install -y sysinternals
+      - run: PsExec64 -s -w ${{ github.workspace }} C:\hostedtoolcache\windows\go\${{ steps.go.outputs.go-version }}\x64\bin\go.exe env -w GOMODCACHE=C:\Users\runneradmin\go\pkg\mod
+      - run: PsExec64 -s -w ${{ github.workspace }} C:\hostedtoolcache\windows\go\${{ steps.go.outputs.go-version }}\x64\bin\go.exe env -w GOCACHE=C:\Users\runneradmin\AppData\Local\go-build
+
+      - name: test
+        run: PsExec64 -s -w ${{ github.workspace }} cmd.exe /c "C:\hostedtoolcache\windows\go\${{ steps.go.outputs.go-version }}\x64\bin\go.exe test -timeout 5m -p 1 ./... > test-out.txt 2>&1"
+      - name: test output
+        if: ${{ always() }}
+        run: Get-Content test-out.txt

.github/workflows/golangci-lint.yml

@@ -1,5 +1,8 @@
 name: golangci-lint
 on: [pull_request]
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.head_ref || github.actor_id }}
+  cancel-in-progress: true
 jobs:
   golangci:
     name: lint

.github/workflows/install-test-darwin.yml

@@ -7,7 +7,9 @@ on:
   pull_request:
     paths:
       - "release_files/install.sh"
-
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.head_ref || github.actor_id }}
+  cancel-in-progress: true
 jobs:
   install-cli-only:
     runs-on: macos-latest

.github/workflows/install-test-linux.yml

@@ -7,7 +7,9 @@ on:
   pull_request:
     paths:
       - "release_files/install.sh"
-
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.head_ref || github.actor_id }}
+  cancel-in-progress: true
 jobs:
   install-cli-only:
     runs-on: ubuntu-latest

.github/workflows/release.yml

@@ -9,9 +9,13 @@ on:
   pull_request:
 
 env:
-  SIGN_PIPE_VER: "v0.0.5"
+  SIGN_PIPE_VER: "v0.0.6"
   GORELEASER_VER: "v1.14.1"
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.head_ref || github.actor_id }}
+  cancel-in-progress: true
+
 jobs:
   release:
     runs-on: ubuntu-latest
@@ -21,10 +25,6 @@ jobs:
         uses: actions/checkout@v2
         with:
           fetch-depth: 0 # It is required for GoReleaser to work properly
-
-      - name: Generate syso with DLL
-        run: bash -x wireguard_nt.sh
-        working-directory: client
       -
         name: Set up Go
         uses: actions/setup-go@v2
@@ -59,6 +59,17 @@ jobs:
           password: ${{ secrets.DOCKER_TOKEN }}
       - name: Install OS build dependencies
         run: sudo apt update && sudo apt install -y -q gcc-arm-linux-gnueabihf gcc-aarch64-linux-gnu
+
+      - name: Install rsrc
+        run: go install github.com/akavel/rsrc@v0.10.2
+      - name: Generate windows rsrc amd64
+        run: rsrc -arch amd64 -ico client/ui/netbird.ico -manifest client/manifest.xml -o client/resources_windows_amd64.syso
+      - name: Generate windows rsrc arm64
+        run: rsrc -arch arm64 -ico client/ui/netbird.ico -manifest client/manifest.xml -o client/resources_windows_arm64.syso
+      - name: Generate windows rsrc arm
+        run: rsrc -arch arm -ico client/ui/netbird.ico -manifest client/manifest.xml -o client/resources_windows_arm.syso
+      - name: Generate windows rsrc 386
+        run: rsrc -arch 386 -ico client/ui/netbird.ico -manifest client/manifest.xml -o client/resources_windows_386.syso
       -
         name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v2

.github/workflows/test-docker-compose-linux.yml

@@ -6,6 +6,10 @@ on:
       - main
   pull_request:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.head_ref || github.actor_id }}
+  cancel-in-progress: true
+
 jobs:
   test:
     runs-on: ubuntu-latest

client/android/client.go

@@ -26,7 +26,7 @@ type TunAdapter interface {
 
 // IFaceDiscover export internal IFaceDiscover for mobile
 type IFaceDiscover interface {
-	stdnet.IFaceDiscover
+	stdnet.ExternalIFaceDiscover
 }
 
 func init() {

client/installer.nsis

@@ -193,6 +193,7 @@ ExecWait `taskkill /im ${UI_APP_EXE}.exe`
 Sleep 3000
 Delete "$INSTDIR\${UI_APP_EXE}"
 Delete "$INSTDIR\${MAIN_APP_EXE}"
+Delete "$INSTDIR\wintun.dll"
 RmDir /r "$INSTDIR"
 
 SetShellVarContext current

client/internal/config.go

@@ -27,7 +27,7 @@ const (
 )
 
 var defaultInterfaceBlacklist = []string{iface.WgInterfaceDefault, "wt", "utun", "tun0", "zt", "ZeroTier", "wg", "ts",
-	"Tailscale", "tailscale", "docker", "veth", "br-"}
+	"Tailscale", "tailscale", "docker", "veth", "br-", "lo"}
 
 // ConfigInput carries configuration changes to the client
 type ConfigInput struct {

client/internal/connect.go

@@ -23,7 +23,7 @@ import (
 )
 
 // RunClient with main logic.
-func RunClient(ctx context.Context, config *Config, statusRecorder *peer.Status, tunAdapter iface.TunAdapter, iFaceDiscover stdnet.IFaceDiscover) error {
+func RunClient(ctx context.Context, config *Config, statusRecorder *peer.Status, tunAdapter iface.TunAdapter, iFaceDiscover stdnet.ExternalIFaceDiscover) error {
 	backOff := &backoff.ExponentialBackOff{
 		InitialInterval:     time.Second,
 		RandomizationFactor: 1,
@@ -108,7 +108,7 @@ func RunClient(ctx context.Context, config *Config, statusRecorder *peer.Status,
 		localPeerState := peer.LocalPeerState{
 			IP:              loginResp.GetPeerConfig().GetAddress(),
 			PubKey:          myPrivateKey.PublicKey().String(),
-			KernelInterface: iface.WireguardModuleIsLoaded(),
+			KernelInterface: iface.WireGuardModuleIsLoaded(),
 			FQDN:            loginResp.GetPeerConfig().GetFqdn(),
 		}
 
@@ -194,7 +194,7 @@ func RunClient(ctx context.Context, config *Config, statusRecorder *peer.Status,
 }
 
 // createEngineConfig converts configuration received from Management Service to EngineConfig
-func createEngineConfig(key wgtypes.Key, config *Config, peerConfig *mgmProto.PeerConfig, tunAdapter iface.TunAdapter, iFaceDiscover stdnet.IFaceDiscover) (*EngineConfig, error) {
+func createEngineConfig(key wgtypes.Key, config *Config, peerConfig *mgmProto.PeerConfig, tunAdapter iface.TunAdapter, iFaceDiscover stdnet.ExternalIFaceDiscover) (*EngineConfig, error) {
 
 	engineConf := &EngineConfig{
 		WgIfaceName:          config.WgIface,

client/internal/dns/server_test.go

@@ -9,7 +9,10 @@ import (
 	"testing"
 	"time"
 
+	"github.com/netbirdio/netbird/client/internal/stdnet"
+
 	"github.com/miekg/dns"
+
 	nbdns "github.com/netbirdio/netbird/dns"
 	"github.com/netbirdio/netbird/iface"
 )
@@ -199,7 +202,11 @@ func TestUpdateDNSServer(t *testing.T) {
 
 	for n, testCase := range testCases {
 		t.Run(testCase.name, func(t *testing.T) {
-			wgIface, err := iface.NewWGIFace(fmt.Sprintf("utun230%d", n), fmt.Sprintf("100.66.100.%d/32", n+1), iface.DefaultMTU, nil)
+			newNet, err := stdnet.NewNet(nil)
+			if err != nil {
+				t.Fatal(err)
+			}
+			wgIface, err := iface.NewWGIFace(fmt.Sprintf("utun230%d", n), fmt.Sprintf("100.66.100.%d/32", n+1), iface.DefaultMTU, nil, newNet)
 			if err != nil {
 				t.Fatal(err)
 			}

client/internal/engine.go

@@ -50,7 +50,7 @@ type EngineConfig struct {
 	// TunAdapter is option. It is necessary for mobile version.
 	TunAdapter iface.TunAdapter
 
-	IFaceDiscover stdnet.IFaceDiscover
+	IFaceDiscover stdnet.ExternalIFaceDiscover
 
 	// WgAddr is a Wireguard local address (Netbird Network IP)
 	WgAddr string
@@ -166,34 +166,56 @@ func (e *Engine) Stop() error {
 	return nil
 }
 
-// Start creates a new Wireguard tunnel interface and listens to events from Signal and Management services
+// Start creates a new WireGuard tunnel interface and listens to events from Signal and Management services
 // Connections to remote peers are not established here.
 // However, they will be established once an event with a list of peers to connect to will be received from Management Service
 func (e *Engine) Start() error {
 	e.syncMsgMux.Lock()
 	defer e.syncMsgMux.Unlock()
 
-	wgIfaceName := e.config.WgIfaceName
+	wgIFaceName := e.config.WgIfaceName
 	wgAddr := e.config.WgAddr
 	myPrivateKey := e.config.WgPrivateKey
 	var err error
-
+	transportNet, err := e.newStdNet()
-	e.wgInterface, err = iface.NewWGIFace(wgIfaceName, wgAddr, iface.DefaultMTU, e.config.TunAdapter)
 	if err != nil {
-		log.Errorf("failed creating wireguard interface instance %s: [%s]", wgIfaceName, err.Error())
+		log.Errorf("failed to create pion's stdnet: %s", err)
+	}
+	e.wgInterface, err = iface.NewWGIFace(wgIFaceName, wgAddr, iface.DefaultMTU, e.config.TunAdapter, transportNet)
+	if err != nil {
+		log.Errorf("failed creating wireguard interface instance %s: [%s]", wgIFaceName, err.Error())
 		return err
 	}
 
+	err = e.wgInterface.Create()
+	if err != nil {
+		log.Errorf("failed creating tunnel interface %s: [%s]", wgIFaceName, err.Error())
+		e.close()
+		return err
+	}
+
+	err = e.wgInterface.Configure(myPrivateKey.String(), e.config.WgPort)
+	if err != nil {
+		log.Errorf("failed configuring Wireguard interface [%s]: %s", wgIFaceName, err.Error())
+		e.close()
+		return err
+	}
+
+	if e.wgInterface.IsUserspaceBind() {
+		iceBind := e.wgInterface.GetBind()
+		udpMux, err := iceBind.GetICEMux()
+		if err != nil {
+			e.close()
+			return err
+		}
+		e.udpMux = udpMux.UDPMuxDefault
+		e.udpMuxSrflx = udpMux
+		log.Infof("using userspace bind mode %s", udpMux.LocalAddr().String())
+	} else {
 		networkName := "udp"
 		if e.config.DisableIPv6Discovery {
 			networkName = "udp4"
 		}
-
-	transportNet, err := e.newStdNet()
-	if err != nil {
-		log.Warnf("failed to create pion's stdnet: %s", err)
-	}
-
 		e.udpMuxConn, err = net.ListenUDP(networkName, &net.UDPAddr{Port: e.config.UDPMuxPort})
 		if err != nil {
 			log.Errorf("failed listening on UDP port %d: [%s]", e.config.UDPMuxPort, err.Error())
@@ -213,19 +235,6 @@ func (e *Engine) Start() error {
 			return err
 		}
 		e.udpMuxSrflx = ice.NewUniversalUDPMuxDefault(ice.UniversalUDPMuxParams{UDPConn: e.udpMuxConnSrflx, Net: transportNet})
-
-	err = e.wgInterface.Create()
-	if err != nil {
-		log.Errorf("failed creating tunnel interface %s: [%s]", wgIfaceName, err.Error())
-		e.close()
-		return err
-	}
-
-	err = e.wgInterface.Configure(myPrivateKey.String(), e.config.WgPort)
-	if err != nil {
-		log.Errorf("failed configuring Wireguard interface [%s]: %s", wgIfaceName, err.Error())
-		e.close()
-		return err
 	}
 
 	e.routeManager = routemanager.NewManager(e.ctx, e.config.WgPrivateKey.PublicKey().String(), e.wgInterface, e.statusRecorder)
@@ -496,7 +505,7 @@ func (e *Engine) updateConfig(conf *mgmProto.PeerConfig) error {
 	e.statusRecorder.UpdateLocalPeerState(peer.LocalPeerState{
 		IP:              e.config.WgAddr,
 		PubKey:          e.config.WgPrivateKey.PublicKey().String(),
-		KernelInterface: iface.WireguardModuleIsLoaded(),
+		KernelInterface: iface.WireGuardModuleIsLoaded(),
 		FQDN:            conf.GetFqdn(),
 	})
 
@@ -822,6 +831,7 @@ func (e Engine) createPeerConn(pubKey string, allowedIPs string) (*peer.Conn, er
 		ProxyConfig:          proxyConfig,
 		LocalWgPort:          e.config.WgPort,
 		NATExternalIPs:       e.parseNATExternalIPMappings(),
+		UserspaceBind:        e.wgInterface.IsUserspaceBind(),
 	}
 
 	peerConn, err := peer.NewConn(config, e.statusRecorder, e.config.TunAdapter, e.config.IFaceDiscover)
@@ -1006,12 +1016,6 @@ func (e *Engine) close() {
 		}
 	}
 
-	if e.udpMuxSrflx != nil {
-		if err := e.udpMuxSrflx.Close(); err != nil {
-			log.Debugf("close server reflexive udp mux: %v", err)
-		}
-	}
-
 	if e.udpMuxConn != nil {
 		if err := e.udpMuxConn.Close(); err != nil {
 			log.Debugf("close udp mux connection: %v", err)

client/internal/engine_stdnet.go

@@ -3,9 +3,9 @@
 package internal
 
 import (
-	"github.com/pion/transport/v2/stdnet"
+	"github.com/netbirdio/netbird/client/internal/stdnet"
 )
 
 func (e *Engine) newStdNet() (*stdnet.Net, error) {
-	return stdnet.NewNet()
+	return stdnet.NewNet(e.config.IFaceBlackList)
 }

client/internal/engine_stdnet_android.go

@@ -3,5 +3,5 @@ package internal
 import "github.com/netbirdio/netbird/client/internal/stdnet"
 
 func (e *Engine) newStdNet() (*stdnet.Net, error) {
-	return stdnet.NewNet(e.config.IFaceDiscover)
+	return stdnet.NewNetWithDiscover(e.config.IFaceDiscover, e.config.IFaceBlackList)
 }

client/internal/engine_test.go

@@ -3,6 +3,8 @@ package internal
 import (
 	"context"
 	"fmt"
+	"github.com/netbirdio/netbird/iface/bind"
+	"github.com/pion/transport/v2/stdnet"
 	"net"
 	"net/netip"
 	"os"
@@ -207,11 +209,23 @@ func TestEngine_UpdateNetworkMap(t *testing.T) {
 		WgPrivateKey: key,
 		WgPort:       33100,
 	}, peer.NewRecorder("https://mgm"))
-	engine.wgInterface, err = iface.NewWGIFace("utun102", "100.64.0.1/24", iface.DefaultMTU, nil)
+	newNet, err := stdnet.NewNet()
+	if err != nil {
+		t.Fatal(err)
+	}
+	engine.wgInterface, err = iface.NewWGIFace("utun102", "100.64.0.1/24", iface.DefaultMTU, nil, newNet)
+	if err != nil {
+		t.Fatal(err)
+	}
 	engine.routeManager = routemanager.NewManager(ctx, key.PublicKey().String(), engine.wgInterface, engine.statusRecorder)
 	engine.dnsServer = &dns.MockServer{
 		UpdateDNSServerFunc: func(serial uint64, update nbdns.Config) error { return nil },
 	}
+	conn, err := net.ListenUDP("udp4", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	engine.udpMux = bind.NewUniversalUDPMuxDefault(bind.UniversalUDPMuxParams{UDPConn: conn})
 
 	type testCase struct {
 		name       string
@@ -549,7 +563,11 @@ func TestEngine_UpdateNetworkMapWithRoutes(t *testing.T) {
 				WgPrivateKey: key,
 				WgPort:       33100,
 			}, peer.NewRecorder("https://mgm"))
-			engine.wgInterface, err = iface.NewWGIFace(wgIfaceName, wgAddr, iface.DefaultMTU, nil)
+			newNet, err := stdnet.NewNet()
+			if err != nil {
+				t.Fatal(err)
+			}
+			engine.wgInterface, err = iface.NewWGIFace(wgIfaceName, wgAddr, iface.DefaultMTU, nil, newNet)
 			assert.NoError(t, err, "shouldn't return error")
 			input := struct {
 				inputSerial uint64
@@ -714,7 +732,11 @@ func TestEngine_UpdateNetworkMapWithDNSUpdate(t *testing.T) {
 				WgPrivateKey: key,
 				WgPort:       33100,
 			}, peer.NewRecorder("https://mgm"))
-			engine.wgInterface, err = iface.NewWGIFace(wgIfaceName, wgAddr, iface.DefaultMTU, nil)
+			newNet, err := stdnet.NewNet()
+			if err != nil {
+				t.Fatal(err)
+			}
+			engine.wgInterface, err = iface.NewWGIFace(wgIfaceName, wgAddr, iface.DefaultMTU, nil, newNet)
 			assert.NoError(t, err, "shouldn't return error")
 
 			mockRouteManager := &routemanager.MockManager{

client/internal/peer/conn.go

@@ -10,7 +10,6 @@ import (
 
 	"github.com/pion/ice/v2"
 	log "github.com/sirupsen/logrus"
-	"golang.zx2c4.com/wireguard/wgctrl"
 
 	"github.com/netbirdio/netbird/client/internal/proxy"
 	"github.com/netbirdio/netbird/client/internal/stdnet"
@@ -46,6 +45,9 @@ type ConnConfig struct {
 	LocalWgPort int
 
 	NATExternalIPs []string
+
+	// UsesBind indicates whether the WireGuard interface is userspace and uses bind.ICEBind
+	UserspaceBind bool
 }
 
 // OfferAnswer represents a session establishment offer or answer
@@ -95,7 +97,7 @@ type Conn struct {
 	meta         meta
 
 	adapter       iface.TunAdapter
-	iFaceDiscover stdnet.IFaceDiscover
+	iFaceDiscover stdnet.ExternalIFaceDiscover
 }
 
 // meta holds meta information about a connection
@@ -121,7 +123,7 @@ func (conn *Conn) UpdateConf(conf ConnConfig) {
 
 // NewConn creates a new not opened Conn to the remote peer.
 // To establish a connection run Conn.Open
-func NewConn(config ConnConfig, statusRecorder *Status, adapter iface.TunAdapter, iFaceDiscover stdnet.IFaceDiscover) (*Conn, error) {
+func NewConn(config ConnConfig, statusRecorder *Status, adapter iface.TunAdapter, iFaceDiscover stdnet.ExternalIFaceDiscover) (*Conn, error) {
 	return &Conn{
 		config:         config,
 		mu:             sync.Mutex{},
@@ -136,32 +138,6 @@ func NewConn(config ConnConfig, statusRecorder *Status, adapter iface.TunAdapter
 	}, nil
 }
 
-// interfaceFilter is a function passed to ICE Agent to filter out not allowed interfaces
-// to avoid building tunnel over them
-func interfaceFilter(blackList []string) func(string) bool {
-
-	return func(iFace string) bool {
-		for _, s := range blackList {
-			if strings.HasPrefix(iFace, s) {
-				log.Debugf("ignoring interface %s - it is not allowed", iFace)
-				return false
-			}
-		}
-		// look for unlisted WireGuard interfaces
-		wg, err := wgctrl.New()
-		if err != nil {
-			log.Debugf("trying to create a wgctrl client failed with: %v", err)
-			return true
-		}
-		defer func() {
-			_ = wg.Close()
-		}()
-
-		_, err = wg.Device(iFace)
-		return err != nil
-	}
-}
-
 func (conn *Conn) reCreateAgent() error {
 	conn.mu.Lock()
 	defer conn.mu.Unlock()
@@ -171,7 +147,7 @@ func (conn *Conn) reCreateAgent() error {
 	var err error
 	transportNet, err := conn.newStdNet()
 	if err != nil {
-		log.Warnf("failed to create pion's stdnet: %s", err)
+		log.Errorf("failed to create pion's stdnet: %s", err)
 	}
 	agentConfig := &ice.AgentConfig{
 		MulticastDNSMode: ice.MulticastDNSModeDisabled,
@@ -179,7 +155,7 @@ func (conn *Conn) reCreateAgent() error {
 		Urls:             conn.config.StunTurn,
 		CandidateTypes:   []ice.CandidateType{ice.CandidateTypeHost, ice.CandidateTypeServerReflexive, ice.CandidateTypeRelay},
 		FailedTimeout:    &failedTimeout,
-		InterfaceFilter:  interfaceFilter(conn.config.InterfaceBlackList),
+		InterfaceFilter:  stdnet.InterfaceFilter(conn.config.InterfaceBlackList),
 		UDPMux:           conn.config.UDPMux,
 		UDPMuxSrflx:      conn.config.UDPMuxSrflx,
 		NAT1To1IPs:       conn.config.NATExternalIPs,
@@ -319,7 +295,7 @@ func (conn *Conn) Open() error {
 		return err
 	}
 
-	if conn.proxy.Type() == proxy.TypeNoProxy {
+	if conn.proxy.Type() == proxy.TypeDirectNoProxy {
 		host, _, _ := net.SplitHostPort(remoteConn.LocalAddr().String())
 		rhost, _, _ := net.SplitHostPort(remoteConn.RemoteAddr().String())
 		// direct Wireguard connection
@@ -341,29 +317,62 @@ func (conn *Conn) Open() error {
 
 // useProxy determines whether a direct connection (without a go proxy) is possible
 //
-// There are 2 cases:
+// There are 3 cases:
 //
 // * When neither candidate is from hard nat and one of the peers has a public IP
 //
 // * both peers are in the same private network
 //
+// * Local peer uses userspace interface with bind.ICEBind and is not relayed
+//
 // Please note, that this check happens when peers were already able to ping each other using ICE layer.
-func shouldUseProxy(pair *ice.CandidatePair) bool {
+func shouldUseProxy(pair *ice.CandidatePair, userspaceBind bool) bool {
+
+	if !isRelayCandidate(pair.Local) && userspaceBind {
+		log.Debugf("shouldn't use proxy because using Bind and the connection is not relayed")
+		return false
+	}
+
 	if !isHardNATCandidate(pair.Local) && isHostCandidateWithPublicIP(pair.Remote) {
+		log.Debugf("shouldn't use proxy because the local peer is not behind a hard NAT and the remote one has a public IP")
 		return false
 	}
 
 	if !isHardNATCandidate(pair.Remote) && isHostCandidateWithPublicIP(pair.Local) {
+		log.Debugf("shouldn't use proxy because the remote peer is not behind a hard NAT and the local one has a public IP")
 		return false
 	}
 
-	if isHostCandidateWithPrivateIP(pair.Local) && isHostCandidateWithPrivateIP(pair.Remote) {
+	if isHostCandidateWithPrivateIP(pair.Local) && isHostCandidateWithPrivateIP(pair.Remote) && isSameNetworkPrefix(pair) {
+		log.Debugf("shouldn't use proxy because peers are in the same private /16 network")
+		return false
+	}
+
+	if (isPeerReflexiveCandidateWithPrivateIP(pair.Local) && isHostCandidateWithPrivateIP(pair.Remote) ||
+		isHostCandidateWithPrivateIP(pair.Local) && isPeerReflexiveCandidateWithPrivateIP(pair.Remote)) && isSameNetworkPrefix(pair) {
+		log.Debugf("shouldn't use proxy because peers are in the same private /16 network and one peer is peer reflexive")
 		return false
 	}
 
 	return true
 }
 
+func isSameNetworkPrefix(pair *ice.CandidatePair) bool {
+
+	localIP := net.ParseIP(pair.Local.Address())
+	remoteIP := net.ParseIP(pair.Remote.Address())
+	if localIP == nil || remoteIP == nil {
+		return false
+	}
+	// only consider /16 networks
+	mask := net.IPMask{255, 255, 0, 0}
+	return localIP.Mask(mask).Equal(remoteIP.Mask(mask))
+}
+
+func isRelayCandidate(candidate ice.Candidate) bool {
+	return candidate.Type() == ice.CandidateTypeRelay
+}
+
 func isHardNATCandidate(candidate ice.Candidate) bool {
 	return candidate.Type() == ice.CandidateTypeRelay || candidate.Type() == ice.CandidateTypePeerReflexive
 }
@@ -376,9 +385,13 @@ func isHostCandidateWithPrivateIP(candidate ice.Candidate) bool {
 	return candidate.Type() == ice.CandidateTypeHost && !isPublicIP(candidate.Address())
 }
 
+func isPeerReflexiveCandidateWithPrivateIP(candidate ice.Candidate) bool {
+	return candidate.Type() == ice.CandidateTypePeerReflexive && !isPublicIP(candidate.Address())
+}
+
 func isPublicIP(address string) bool {
 	ip := net.ParseIP(address)
-	if ip.IsLoopback() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() || ip.IsPrivate() {
+	if ip == nil || ip.IsLoopback() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() || ip.IsPrivate() {
 		return false
 	}
 	return true
@@ -412,7 +425,7 @@ func (conn *Conn) startProxy(remoteConn net.Conn, remoteWgPort int) error {
 	if pair.Local.Type() == ice.CandidateTypeRelay || pair.Remote.Type() == ice.CandidateTypeRelay {
 		peerState.Relayed = true
 	}
-	peerState.Direct = p.Type() == proxy.TypeNoProxy
+	peerState.Direct = p.Type() == proxy.TypeDirectNoProxy || p.Type() == proxy.TypeNoProxy
 
 	err = conn.statusRecorder.UpdatePeerState(peerState)
 	if err != nil {
@@ -423,8 +436,7 @@ func (conn *Conn) startProxy(remoteConn net.Conn, remoteWgPort int) error {
 }
 
 func (conn *Conn) getProxyWithMessageExchange(pair *ice.CandidatePair, remoteWgPort int) proxy.Proxy {
-
+	useProxy := shouldUseProxy(pair, conn.config.UserspaceBind)
-	useProxy := shouldUseProxy(pair)
 	localDirectMode := !useProxy
 	remoteDirectMode := localDirectMode
 
@@ -434,13 +446,16 @@ func (conn *Conn) getProxyWithMessageExchange(pair *ice.CandidatePair, remoteWgP
 		remoteDirectMode = conn.receiveRemoteDirectMode()
 	}
 
+	if conn.config.UserspaceBind && localDirectMode {
+		return proxy.NewNoProxy(conn.config.ProxyConfig)
+	}
+
 	if localDirectMode && remoteDirectMode {
-		log.Debugf("using WireGuard direct mode with peer %s", conn.config.Key)
+		return proxy.NewDirectNoProxy(conn.config.ProxyConfig, remoteWgPort)
-		return proxy.NewNoProxy(conn.config.ProxyConfig, remoteWgPort)
 	}
 
 	log.Debugf("falling back to local proxy mode with peer %s", conn.config.Key)
-	return proxy.NewWireguardProxy(conn.config.ProxyConfig)
+	return proxy.NewWireGuardProxy(conn.config.ProxyConfig)
 }
 
 func (conn *Conn) sendLocalDirectMode(localMode bool) {

client/internal/peer/conn_test.go

@@ -5,6 +5,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/netbirdio/netbird/client/internal/stdnet"
+
 	"github.com/magiconair/properties/assert"
 	"github.com/pion/ice/v2"
 	"golang.org/x/sync/errgroup"
@@ -28,7 +30,7 @@ func TestNewConn_interfaceFilter(t *testing.T) {
 	ignore := []string{iface.WgInterfaceDefault, "tun0", "zt", "ZeroTier", "utun", "wg", "ts",
 		"Tailscale", "tailscale"}
 
-	filter := interfaceFilter(ignore)
+	filter := stdnet.InterfaceFilter(ignore)
 
 	for _, s := range ignore {
 		assert.Equal(t, filter(s), false)
@@ -208,6 +210,7 @@ func TestConn_ShouldUseProxy(t *testing.T) {
 			return ice.CandidateTypeHost
 		},
 	}
+
 	srflxCandidate := &mockICECandidate{
 		AddressFunc: func() string {
 			return "1.1.1.1"
@@ -320,11 +323,47 @@ func TestConn_ShouldUseProxy(t *testing.T) {
 			},
 			expected: false,
 		},
+		{
+			name: "Don't Use Proxy When Both Candidates are in private network and one is peer reflexive",
+			candatePair: &ice.CandidatePair{
+				Local: &mockICECandidate{AddressFunc: func() string {
+					return "10.16.102.168"
+				},
+					TypeFunc: func() ice.CandidateType {
+						return ice.CandidateTypeHost
+					}},
+				Remote: &mockICECandidate{AddressFunc: func() string {
+					return "10.16.101.96"
+				},
+					TypeFunc: func() ice.CandidateType {
+						return ice.CandidateTypePeerReflexive
+					}},
+			},
+			expected: false,
+		},
+		{
+			name: "Should Use Proxy When Both Candidates are in private network and both are peer reflexive",
+			candatePair: &ice.CandidatePair{
+				Local: &mockICECandidate{AddressFunc: func() string {
+					return "10.16.102.168"
+				},
+					TypeFunc: func() ice.CandidateType {
+						return ice.CandidateTypePeerReflexive
+					}},
+				Remote: &mockICECandidate{AddressFunc: func() string {
+					return "10.16.101.96"
+				},
+					TypeFunc: func() ice.CandidateType {
+						return ice.CandidateTypePeerReflexive
+					}},
+			},
+			expected: true,
+		},
 	}
 
 	for _, testCase := range testCases {
 		t.Run(testCase.name, func(t *testing.T) {
-			result := shouldUseProxy(testCase.candatePair)
+			result := shouldUseProxy(testCase.candatePair, false)
 			if result != testCase.expected {
 				t.Errorf("got a different result. Expected %t Got %t", testCase.expected, result)
 			}
@@ -365,7 +404,7 @@ func TestGetProxyWithMessageExchange(t *testing.T) {
 			},
 			inputDirectModeSupport: true,
 			inputRemoteModeMessage: true,
-			expected:               proxy.TypeWireguard,
+			expected:               proxy.TypeWireGuard,
 		},
 		{
 			name: "Should Result In Using Wireguard Proxy When Remote Eval Is Use Proxy",
@@ -375,7 +414,7 @@ func TestGetProxyWithMessageExchange(t *testing.T) {
 			},
 			inputDirectModeSupport: true,
 			inputRemoteModeMessage: false,
-			expected:               proxy.TypeWireguard,
+			expected:               proxy.TypeWireGuard,
 		},
 		{
 			name: "Should Result In Using Wireguard Proxy When Remote Direct Mode Support Is False And Local Eval Is Use Proxy",
@@ -385,7 +424,7 @@ func TestGetProxyWithMessageExchange(t *testing.T) {
 			},
 			inputDirectModeSupport: false,
 			inputRemoteModeMessage: false,
-			expected:               proxy.TypeWireguard,
+			expected:               proxy.TypeWireGuard,
 		},
 		{
 			name: "Should Result In Using Direct When Remote Direct Mode Support Is False And Local Eval Is No Use Proxy",
@@ -395,7 +434,7 @@ func TestGetProxyWithMessageExchange(t *testing.T) {
 			},
 			inputDirectModeSupport: false,
 			inputRemoteModeMessage: false,
-			expected:               proxy.TypeNoProxy,
+			expected:               proxy.TypeDirectNoProxy,
 		},
 		{
 			name: "Should Result In Using Direct When Local And Remote Eval Is No Proxy",
@@ -405,7 +444,7 @@ func TestGetProxyWithMessageExchange(t *testing.T) {
 			},
 			inputDirectModeSupport: true,
 			inputRemoteModeMessage: true,
-			expected:               proxy.TypeNoProxy,
+			expected:               proxy.TypeDirectNoProxy,
 		},
 	}
 	for _, testCase := range testCases {

client/internal/peer/stdnet.go

@@ -3,9 +3,9 @@
 package peer
 
 import (
-	"github.com/pion/transport/v2/stdnet"
+	"github.com/netbirdio/netbird/client/internal/stdnet"
 )
 
 func (conn *Conn) newStdNet() (*stdnet.Net, error) {
-	return stdnet.NewNet()
+	return stdnet.NewNet(conn.config.InterfaceBlackList)
 }

client/internal/peer/stdnet_android.go

@@ -3,5 +3,5 @@ package peer
 import "github.com/netbirdio/netbird/client/internal/stdnet"
 
 func (conn *Conn) newStdNet() (*stdnet.Net, error) {
-	return stdnet.NewNet(conn.iFaceDiscover)
+	return stdnet.NewNetWithDiscover(conn.iFaceDiscover, conn.config.InterfaceBlackList)
 }

client/internal/proxy/direct.go

@@ -0,0 +1,57 @@
+package proxy
+
+import (
+	log "github.com/sirupsen/logrus"
+	"net"
+)
+
+// DirectNoProxy is used when there is no need for a proxy between ICE and WireGuard.
+// This is possible in either of these cases:
+// - peers are in the same local network
+// - one of the peers has a public static IP (host)
+// DirectNoProxy will just update remote peer with a remote host and fixed WireGuard port (r.g. 51820).
+// In order DirectNoProxy to work, WireGuard port has to be fixed for the time being.
+type DirectNoProxy struct {
+	config Config
+	// RemoteWgListenPort is a WireGuard port of a remote peer.
+	// It is used instead of the hardcoded 51820 port.
+	RemoteWgListenPort int
+}
+
+// NewDirectNoProxy creates a new DirectNoProxy with a provided config and remote peer's WireGuard listen port
+func NewDirectNoProxy(config Config, remoteWgPort int) *DirectNoProxy {
+	return &DirectNoProxy{config: config, RemoteWgListenPort: remoteWgPort}
+}
+
+// Close removes peer from the WireGuard interface
+func (p *DirectNoProxy) Close() error {
+	err := p.config.WgInterface.RemovePeer(p.config.RemoteKey)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// Start just updates WireGuard peer with the remote IP and default WireGuard port
+func (p *DirectNoProxy) Start(remoteConn net.Conn) error {
+
+	log.Debugf("using DirectNoProxy while connecting to peer %s", p.config.RemoteKey)
+	addr, err := net.ResolveUDPAddr("udp", remoteConn.RemoteAddr().String())
+	if err != nil {
+		return err
+	}
+	addr.Port = p.RemoteWgListenPort
+	err = p.config.WgInterface.UpdatePeer(p.config.RemoteKey, p.config.AllowedIps, DefaultWgKeepAlive,
+		addr, p.config.PreSharedKey)
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Type returns the type of this proxy
+func (p *DirectNoProxy) Type() Type {
+	return TypeDirectNoProxy
+}

client/internal/proxy/noproxy.go

@@ -5,24 +5,18 @@ import (
 	"net"
 )
 
-// NoProxy is used when there is no need for a proxy between ICE and Wireguard.
+// NoProxy is used just to configure WireGuard without any local proxy in between.
-// This is possible in either of these cases:
+// Used when the WireGuard interface is userspace and uses bind.ICEBind
-// - peers are in the same local network
-// - one of the peers has a public static IP (host)
-// NoProxy will just update remote peer with a remote host and fixed Wireguard port (r.g. 51820).
-// In order NoProxy to work, Wireguard port has to be fixed for the time being.
 type NoProxy struct {
 	config Config
-	// RemoteWgListenPort is a WireGuard port of a remote peer.
-	// It is used instead of the hardcoded 51820 port.
-	RemoteWgListenPort int
 }
 
-// NewNoProxy creates a new NoProxy with a provided config and remote peer's WireGuard listen port
+// NewNoProxy creates a new NoProxy with a provided config
-func NewNoProxy(config Config, remoteWgPort int) *NoProxy {
+func NewNoProxy(config Config) *NoProxy {
-	return &NoProxy{config: config, RemoteWgListenPort: remoteWgPort}
+	return &NoProxy{config: config}
 }
 
+// Close removes peer from the WireGuard interface
 func (p *NoProxy) Close() error {
 	err := p.config.WgInterface.RemovePeer(p.config.RemoteKey)
 	if err != nil {
@@ -31,23 +25,16 @@ func (p *NoProxy) Close() error {
 	return nil
 }
 
-// Start just updates Wireguard peer with the remote IP and default Wireguard port
+// Start just updates WireGuard peer with the remote address
 func (p *NoProxy) Start(remoteConn net.Conn) error {
 
-	log.Debugf("using NoProxy while connecting to peer %s", p.config.RemoteKey)
+	log.Debugf("using NoProxy to connect to peer %s at %s", p.config.RemoteKey, remoteConn.RemoteAddr().String())
 	addr, err := net.ResolveUDPAddr("udp", remoteConn.RemoteAddr().String())
 	if err != nil {
 		return err
 	}
-	addr.Port = p.RemoteWgListenPort
+	return p.config.WgInterface.UpdatePeer(p.config.RemoteKey, p.config.AllowedIps, DefaultWgKeepAlive,
-	err = p.config.WgInterface.UpdatePeer(p.config.RemoteKey, p.config.AllowedIps, DefaultWgKeepAlive,
 		addr, p.config.PreSharedKey)
-
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 func (p *NoProxy) Type() Type {

client/internal/proxy/proxy.go

@@ -13,9 +13,10 @@ const DefaultWgKeepAlive = 25 * time.Second
 type Type string
 
 const (
-	TypeNoProxy   Type = "NoProxy"
+	TypeDirectNoProxy Type = "DirectNoProxy"
-	TypeWireguard Type = "Wireguard"
+	TypeWireGuard     Type = "WireGuard"
 	TypeDummy         Type = "Dummy"
+	TypeNoProxy       Type = "NoProxy"
 )
 
 type Config struct {

client/internal/proxy/wireguard.go

@@ -6,8 +6,8 @@ import (
 	"net"
 )
 
-// WireguardProxy proxies
+// WireGuardProxy proxies
-type WireguardProxy struct {
+type WireGuardProxy struct {
 	ctx    context.Context
 	cancel context.CancelFunc
 
@@ -17,13 +17,13 @@ type WireguardProxy struct {
 	localConn  net.Conn
 }
 
-func NewWireguardProxy(config Config) *WireguardProxy {
+func NewWireGuardProxy(config Config) *WireGuardProxy {
-	p := &WireguardProxy{config: config}
+	p := &WireGuardProxy{config: config}
 	p.ctx, p.cancel = context.WithCancel(context.Background())
 	return p
 }
 
-func (p *WireguardProxy) updateEndpoint() error {
+func (p *WireGuardProxy) updateEndpoint() error {
 	udpAddr, err := net.ResolveUDPAddr(p.localConn.LocalAddr().Network(), p.localConn.LocalAddr().String())
 	if err != nil {
 		return err
@@ -38,7 +38,7 @@ func (p *WireguardProxy) updateEndpoint() error {
 	return nil
 }
 
-func (p *WireguardProxy) Start(remoteConn net.Conn) error {
+func (p *WireGuardProxy) Start(remoteConn net.Conn) error {
 	p.remoteConn = remoteConn
 
 	var err error
@@ -60,7 +60,7 @@ func (p *WireguardProxy) Start(remoteConn net.Conn) error {
 	return nil
 }
 
-func (p *WireguardProxy) Close() error {
+func (p *WireGuardProxy) Close() error {
 	p.cancel()
 	if c := p.localConn; c != nil {
 		err := p.localConn.Close()
@@ -77,7 +77,7 @@ func (p *WireguardProxy) Close() error {
 
 // proxyToRemote proxies everything from Wireguard to the RemoteKey peer
 // blocks
-func (p *WireguardProxy) proxyToRemote() {
+func (p *WireGuardProxy) proxyToRemote() {
 
 	buf := make([]byte, 1500)
 	for {
@@ -101,7 +101,7 @@ func (p *WireguardProxy) proxyToRemote() {
 
 // proxyToLocal proxies everything from the RemoteKey peer to local Wireguard
 // blocks
-func (p *WireguardProxy) proxyToLocal() {
+func (p *WireGuardProxy) proxyToLocal() {
 
 	buf := make([]byte, 1500)
 	for {
@@ -123,6 +123,6 @@ func (p *WireguardProxy) proxyToLocal() {
 	}
 }
 
-func (p *WireguardProxy) Type() Type {
+func (p *WireGuardProxy) Type() Type {
-	return TypeWireguard
+	return TypeWireGuard
 }

client/internal/routemanager/manager_test.go

@@ -3,6 +3,7 @@ package routemanager
 import (
 	"context"
 	"fmt"
+	"github.com/pion/transport/v2/stdnet"
 	"net/netip"
 	"runtime"
 	"testing"
@@ -391,7 +392,11 @@ func TestManagerUpdateRoutes(t *testing.T) {
 
 	for n, testCase := range testCases {
 		t.Run(testCase.name, func(t *testing.T) {
-			wgInterface, err := iface.NewWGIFace(fmt.Sprintf("utun43%d", n), "100.65.65.2/24", iface.DefaultMTU, nil)
+			newNet, err := stdnet.NewNet()
+			if err != nil {
+				t.Fatal(err)
+			}
+			wgInterface, err := iface.NewWGIFace(fmt.Sprintf("utun43%d", n), "100.65.65.2/24", iface.DefaultMTU, nil, newNet)
 			require.NoError(t, err, "should create testing WGIface interface")
 			defer wgInterface.Close()
 

client/internal/routemanager/systemops_test.go

@@ -3,6 +3,7 @@ package routemanager
 import (
 	"fmt"
 	"github.com/netbirdio/netbird/iface"
+	"github.com/pion/transport/v2/stdnet"
 	"github.com/stretchr/testify/require"
 	"net"
 	"net/netip"
@@ -32,7 +33,11 @@ func TestAddRemoveRoutes(t *testing.T) {
 
 	for n, testCase := range testCases {
 		t.Run(testCase.name, func(t *testing.T) {
-			wgInterface, err := iface.NewWGIFace(fmt.Sprintf("utun53%d", n), "100.65.75.2/24", iface.DefaultMTU, nil)
+			newNet, err := stdnet.NewNet()
+			if err != nil {
+				t.Fatal(err)
+			}
+			wgInterface, err := iface.NewWGIFace(fmt.Sprintf("utun53%d", n), "100.65.75.2/24", iface.DefaultMTU, nil, newNet)
 			require.NoError(t, err, "should create testing WGIface interface")
 			defer wgInterface.Close()
 

client/internal/stdnet/discover.go

@@ -0,0 +1,14 @@
+package stdnet
+
+import "github.com/pion/transport/v2"
+
+// ExternalIFaceDiscover provide an option for external services (mobile)
+// to collect network interface information
+type ExternalIFaceDiscover interface {
+	// IFaces return with the description of the interfaces
+	IFaces() (string, error)
+}
+
+type iFaceDiscover interface {
+	iFaces() ([]*transport.Interface, error)
+}

client/internal/stdnet/discover_mobile.go

@@ -0,0 +1,95 @@
+package stdnet
+
+import (
+	"fmt"
+	"net"
+	"strings"
+
+	"github.com/pion/transport/v2"
+	log "github.com/sirupsen/logrus"
+)
+
+type mobileIFaceDiscover struct {
+	externalDiscover ExternalIFaceDiscover
+}
+
+func newMobileIFaceDiscover(externalDiscover ExternalIFaceDiscover) *mobileIFaceDiscover {
+	return &mobileIFaceDiscover{
+		externalDiscover: externalDiscover,
+	}
+}
+
+func (m *mobileIFaceDiscover) iFaces() ([]*transport.Interface, error) {
+	ifacesString, err := m.externalDiscover.IFaces()
+	if err != nil {
+		return nil, err
+	}
+	interfaces := m.parseInterfacesString(ifacesString)
+	return interfaces, nil
+}
+
+func (m *mobileIFaceDiscover) parseInterfacesString(interfaces string) []*transport.Interface {
+	ifs := []*transport.Interface{}
+
+	for _, iface := range strings.Split(interfaces, "\n") {
+		if strings.TrimSpace(iface) == "" {
+			continue
+		}
+
+		fields := strings.Split(iface, "|")
+		if len(fields) != 2 {
+			log.Warnf("parseInterfacesString: unable to split %q", iface)
+			continue
+		}
+
+		var name string
+		var index, mtu int
+		var up, broadcast, loopback, pointToPoint, multicast bool
+		_, err := fmt.Sscanf(fields[0], "%s %d %d %t %t %t %t %t",
+			&name, &index, &mtu, &up, &broadcast, &loopback, &pointToPoint, &multicast)
+		if err != nil {
+			log.Warnf("parseInterfacesString: unable to parse %q: %v", iface, err)
+			continue
+		}
+
+		newIf := net.Interface{
+			Name:  name,
+			Index: index,
+			MTU:   mtu,
+		}
+		if up {
+			newIf.Flags |= net.FlagUp
+		}
+		if broadcast {
+			newIf.Flags |= net.FlagBroadcast
+		}
+		if loopback {
+			newIf.Flags |= net.FlagLoopback
+		}
+		if pointToPoint {
+			newIf.Flags |= net.FlagPointToPoint
+		}
+		if multicast {
+			newIf.Flags |= net.FlagMulticast
+		}
+
+		ifc := transport.NewInterface(newIf)
+
+		addrs := strings.Trim(fields[1], " \n")
+		foundAddress := false
+		for _, addr := range strings.Split(addrs, " ") {
+			ip, ipNet, err := net.ParseCIDR(addr)
+			if err != nil {
+				log.Warnf("%s", err)
+				continue
+			}
+			ipNet.IP = ip
+			ifc.AddAddress(ipNet)
+			foundAddress = true
+		}
+		if foundAddress {
+			ifs = append(ifs, ifc)
+		}
+	}
+	return ifs
+}

client/internal/stdnet/discover_mobile_test.go

@@ -35,7 +35,9 @@ func Test_parseInterfacesString(t *testing.T) {
 			d.multicast,
 			d.addr)
 	}
-	nets := parseInterfacesString(exampleString)
+
+	d := mobileIFaceDiscover{}
+	nets := d.parseInterfacesString(exampleString)
 	if len(nets) == 0 {
 		t.Fatalf("failed to parse interfaces")
 	}

client/internal/stdnet/discover_pion.go

@@ -0,0 +1,36 @@
+package stdnet
+
+import (
+	"net"
+
+	"github.com/pion/transport/v2"
+)
+
+type pionDiscover struct {
+}
+
+func (d pionDiscover) iFaces() ([]*transport.Interface, error) {
+	ifs := []*transport.Interface{}
+
+	oifs, err := net.Interfaces()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, oif := range oifs {
+		ifc := transport.NewInterface(oif)
+
+		addrs, err := oif.Addrs()
+		if err != nil {
+			return nil, err
+		}
+
+		for _, addr := range addrs {
+			ifc.AddAddress(addr)
+		}
+
+		ifs = append(ifs, ifc)
+	}
+
+	return ifs, nil
+}

client/internal/stdnet/filter.go

@@ -0,0 +1,40 @@
+package stdnet
+
+import (
+	"strings"
+
+	log "github.com/sirupsen/logrus"
+	"golang.zx2c4.com/wireguard/wgctrl"
+)
+
+// InterfaceFilter is a function passed to ICE Agent to filter out not allowed interfaces
+// to avoid building tunnel over them.
+func InterfaceFilter(disallowList []string) func(string) bool {
+
+	return func(iFace string) bool {
+
+		if strings.HasPrefix(iFace, "lo") {
+			// hardcoded loopback check to support already installed agents
+			return false
+		}
+
+		for _, s := range disallowList {
+			if strings.HasPrefix(iFace, s) {
+				log.Debugf("ignoring interface %s - it is not allowed", iFace)
+				return false
+			}
+		}
+		// look for unlisted WireGuard interfaces
+		wg, err := wgctrl.New()
+		if err != nil {
+			log.Debugf("trying to create a wgctrl client failed with: %v", err)
+			return true
+		}
+		defer func() {
+			_ = wg.Close()
+		}()
+
+		_, err = wg.Device(iFace)
+		return err != nil
+	}
+}

client/internal/stdnet/iface_discover.go

@@ -1,8 +0,0 @@
-package stdnet
-
-// IFaceDiscover provide an option for external services (mobile)
-// to collect network interface information
-type IFaceDiscover interface {
-	// IFaces return with the description of the interfaces
-	IFaces() (string, error)
-}

client/internal/stdnet/stdnet.go

@@ -5,12 +5,9 @@ package stdnet
 
 import (
 	"fmt"
-	"net"
-	"strings"
 
 	"github.com/pion/transport/v2"
 	"github.com/pion/transport/v2/stdnet"
-	log "github.com/sirupsen/logrus"
 )
 
 // Net is an implementation of the net.Net interface
@@ -18,24 +15,40 @@ import (
 type Net struct {
 	stdnet.Net
 	interfaces    []*transport.Interface
+	iFaceDiscover iFaceDiscover
+	// interfaceFilter should return true if the given interfaceName is allowed
+	interfaceFilter func(interfaceName string) bool
+}
+
+// NewNetWithDiscover creates a new StdNet instance.
+func NewNetWithDiscover(iFaceDiscover ExternalIFaceDiscover, disallowList []string) (*Net, error) {
+	n := &Net{
+		iFaceDiscover:   newMobileIFaceDiscover(iFaceDiscover),
+		interfaceFilter: InterfaceFilter(disallowList),
+	}
+	return n, n.UpdateInterfaces()
 }
 
 // NewNet creates a new StdNet instance.
-func NewNet(iFaceDiscover IFaceDiscover) (*Net, error) {
+func NewNet(disallowList []string) (*Net, error) {
-	n := &Net{}
+	n := &Net{
-
+		iFaceDiscover:   pionDiscover{},
-	return n, n.UpdateInterfaces(iFaceDiscover)
+		interfaceFilter: InterfaceFilter(disallowList),
+	}
+	return n, n.UpdateInterfaces()
 }
 
 // UpdateInterfaces updates the internal list of network interfaces
-// and associated addresses.
+// and associated addresses filtering them by name.
-func (n *Net) UpdateInterfaces(iFaceDiscover IFaceDiscover) error {
+// The interfaces are discovered by an external iFaceDiscover function or by a default discoverer if the external one
-	ifacesString, err := iFaceDiscover.IFaces()
+// wasn't specified.
+func (n *Net) UpdateInterfaces() (err error) {
+	allIfaces, err := n.iFaceDiscover.iFaces()
 	if err != nil {
 		return err
 	}
-	n.interfaces = parseInterfacesString(ifacesString)
+	n.interfaces = n.filterInterfaces(allIfaces)
-	return err
+	return nil
 }
 
 // Interfaces returns a slice of interfaces which are available on the
@@ -70,68 +83,15 @@ func (n *Net) InterfaceByName(name string) (*transport.Interface, error) {
 	return nil, fmt.Errorf("%w: %s", transport.ErrInterfaceNotFound, name)
 }
 
-func parseInterfacesString(interfaces string) []*transport.Interface {
+func (n *Net) filterInterfaces(interfaces []*transport.Interface) []*transport.Interface {
-	ifs := []*transport.Interface{}
+	if n.interfaceFilter == nil {
-
+		return interfaces
-	for _, iface := range strings.Split(interfaces, "\n") {
-		if strings.TrimSpace(iface) == "" {
-			continue
 	}
-
+	result := []*transport.Interface{}
-		fields := strings.Split(iface, "|")
+	for _, iface := range interfaces {
-		if len(fields) != 2 {
+		if n.interfaceFilter(iface.Name) {
-			log.Warnf("parseInterfacesString: unable to split %q", iface)
+			result = append(result, iface)
-			continue
-		}
-
-		var name string
-		var index, mtu int
-		var up, broadcast, loopback, pointToPoint, multicast bool
-		_, err := fmt.Sscanf(fields[0], "%s %d %d %t %t %t %t %t",
-			&name, &index, &mtu, &up, &broadcast, &loopback, &pointToPoint, &multicast)
-		if err != nil {
-			log.Warnf("parseInterfacesString: unable to parse %q: %v", iface, err)
-			continue
-		}
-
-		newIf := net.Interface{
-			Name:  name,
-			Index: index,
-			MTU:   mtu,
-		}
-		if up {
-			newIf.Flags |= net.FlagUp
-		}
-		if broadcast {
-			newIf.Flags |= net.FlagBroadcast
-		}
-		if loopback {
-			newIf.Flags |= net.FlagLoopback
-		}
-		if pointToPoint {
-			newIf.Flags |= net.FlagPointToPoint
-		}
-		if multicast {
-			newIf.Flags |= net.FlagMulticast
-		}
-
-		ifc := transport.NewInterface(newIf)
-
-		addrs := strings.Trim(fields[1], " \n")
-		foundAddress := false
-		for _, addr := range strings.Split(addrs, " ") {
-			ip, ipNet, err := net.ParseCIDR(addr)
-			if err != nil {
-				log.Warnf("%s", err)
-				continue
-			}
-			ipNet.IP = ip
-			ifc.AddAddress(ipNet)
-			foundAddress = true
-		}
-		if foundAddress {
-			ifs = append(ifs, ifc)
 		}
 	}
-	return ifs
+	return result
 }

client/resources.rc

@@ -6,4 +6,4 @@
 #define EXPAND(x) STRINGIZE(x)
 CREATEPROCESS_MANIFEST_RESOURCE_ID RT_MANIFEST manifest.xml
 7 ICON ui/netbird.ico
-wireguard.dll RCDATA wireguard.dll
+wintun.dll RCDATA wintun.dll

client/wireguard_nt.sh

@@ -1,27 +0,0 @@
-#!/bin/bash
-
-ldir=$PWD
-tmp_dir_path=$ldir/.distfiles
-winnt=wireguard-nt.zip
-download_file_path=$tmp_dir_path/$winnt
-download_url=https://download.wireguard.com/wireguard-nt/wireguard-nt-0.10.1.zip
-download_sha=772c0b1463d8d2212716f43f06f4594d880dea4f735165bd68e388fc41b81605
-
-function resources_windows(){
-  cmd=$1
-  arch=$2
-  out=$3
-  docker run -i --rm -v $PWD:$PWD -w $PWD mstorsjo/llvm-mingw:latest $cmd -O coff -c 65001 -I $tmp_dir_path/wireguard-nt/bin/$arch -i resources.rc -o $out
-}
-
-mkdir -p $tmp_dir_path
-curl -L#o $download_file_path.unverified $download_url
-echo "$download_sha  $download_file_path.unverified" | sha256sum -c
-mv $download_file_path.unverified $download_file_path
-
-mkdir -p .deps
-unzip $download_file_path -d $tmp_dir_path
-
-resources_windows i686-w64-mingw32-windres x86 resources_windows_386.syso
-resources_windows aarch64-w64-mingw32-windres arm64 resources_windows_arm64.syso
-resources_windows x86_64-w64-mingw32-windres amd64 resources_windows_amd64.syso

go.mod

@@ -19,7 +19,7 @@ require (
 	github.com/vishvananda/netlink v1.1.0
 	golang.org/x/crypto v0.7.0
 	golang.org/x/sys v0.6.0
-	golang.zx2c4.com/wireguard v0.0.0-20211209221555-9c9e7e272434
+	golang.zx2c4.com/wireguard v0.0.0-20230223181233-21636207a675
 	golang.zx2c4.com/wireguard/wgctrl v0.0.0-20211215182854-7a385b3431de
 	golang.zx2c4.com/wireguard/windows v0.5.1
 	google.golang.org/grpc v1.52.3
@@ -48,6 +48,8 @@ require (
 	github.com/mitchellh/hashstructure/v2 v2.0.2
 	github.com/open-policy-agent/opa v0.49.0
 	github.com/patrickmn/go-cache v2.1.0+incompatible
+	github.com/pion/logging v0.2.2
+	github.com/pion/stun v0.4.0
 	github.com/pion/transport/v2 v2.0.2
 	github.com/prometheus/client_golang v1.14.0
 	github.com/rs/xid v1.3.0
@@ -103,10 +105,8 @@ require (
 	github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c // indirect
 	github.com/pegasus-kv/thrift v0.13.0 // indirect
 	github.com/pion/dtls/v2 v2.2.6 // indirect
-	github.com/pion/logging v0.2.2 // indirect
 	github.com/pion/mdns v0.0.7 // indirect
 	github.com/pion/randutil v0.1.0 // indirect
-	github.com/pion/stun v0.4.0 // indirect
 	github.com/pion/turn/v2 v2.1.0 // indirect
 	github.com/pion/udp/v2 v2.0.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
@@ -131,7 +131,6 @@ require (
 	golang.org/x/mod v0.8.0 // indirect
 	golang.org/x/text v0.8.0 // indirect
 	golang.org/x/tools v0.6.0 // indirect
-	golang.zx2c4.com/go118/netip v0.0.0-20211111135330-a4a02eeacf9d // indirect
 	golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224 // indirect
 	google.golang.org/genproto v0.0.0-20221118155620-16455021b5e6 // indirect
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect

go.sum

@@ -881,13 +881,12 @@ golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8T
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.zx2c4.com/go118/netip v0.0.0-20211111135330-a4a02eeacf9d h1:9+v0G0naRhLPOJEeJOL6NuXTtAHHwmkyZlgQJ0XcQ8I=
 golang.zx2c4.com/go118/netip v0.0.0-20211111135330-a4a02eeacf9d/go.mod h1:5yyfuiqVIJ7t+3MqrpTQ+QqRkMWiESiyDvPNvKYCecg=
 golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224 h1:Ug9qvr1myri/zFN6xL17LSCBGFDnphBBhzmILHsM5TY=
 golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224/go.mod h1:deeaetjYA+DHMHg+sMSMI58GrEteJUUzzw7en6TJQcI=
 golang.zx2c4.com/wireguard v0.0.0-20211129173154-2dd424e2d808/go.mod h1:TjUWrnD5ATh7bFvmm/ALEJZQ4ivKbETb6pmyj1vUoNI=
-golang.zx2c4.com/wireguard v0.0.0-20211209221555-9c9e7e272434 h1:3zl8RkJNQ8wfPRomwv/6DBbH2Ut6dgMaWTxM0ZunWnE=
+golang.zx2c4.com/wireguard v0.0.0-20230223181233-21636207a675 h1:/J/RVnr7ng4fWPRH3xa4WtBJ1Jp+Auu4YNLmGiPv5QU=
-golang.zx2c4.com/wireguard v0.0.0-20211209221555-9c9e7e272434/go.mod h1:TjUWrnD5ATh7bFvmm/ALEJZQ4ivKbETb6pmyj1vUoNI=
+golang.zx2c4.com/wireguard v0.0.0-20230223181233-21636207a675/go.mod h1:whfbyDBt09xhCYQWtO2+3UVjlaq6/9hDZrjg2ZE6SyA=
 golang.zx2c4.com/wireguard/wgctrl v0.0.0-20211215182854-7a385b3431de h1:qDZ+lyO5jC9RNJ7ANJA0GWXk3pSn0Fu5SlcAIlgw+6w=
 golang.zx2c4.com/wireguard/wgctrl v0.0.0-20211215182854-7a385b3431de/go.mod h1:Q2XNgour4QSkFj0BWCkVlW0HWJwQgNMsMahpSlI0Eno=
 golang.zx2c4.com/wireguard/windows v0.5.1 h1:OnYw96PF+CsIMrqWo5QP3Q59q5hY1rFErk/yN3cS+JQ=

iface/bind/bind.go

@@ -0,0 +1,208 @@
+package bind
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"net/netip"
+	"sync"
+	"syscall"
+
+	"github.com/pion/stun"
+	"github.com/pion/transport/v2"
+	log "github.com/sirupsen/logrus"
+	"golang.zx2c4.com/wireguard/conn"
+)
+
+// ICEBind is the userspace implementation of WireGuard's conn.Bind interface using ice.UDPMux of the pion/ice library
+type ICEBind struct {
+	// below fields, initialized on open
+	ipv4   net.PacketConn
+	udpMux *UniversalUDPMuxDefault
+
+	// below are fields initialized on creation
+	transportNet transport.Net
+	mu           sync.Mutex
+}
+
+// NewICEBind create a new instance of ICEBind with a given transportNet function.
+// The transportNet can be nil.
+func NewICEBind(transportNet transport.Net) *ICEBind {
+	return &ICEBind{
+		transportNet: transportNet,
+		mu:           sync.Mutex{},
+	}
+}
+
+// GetICEMux returns the ICE UDPMux that was created and used by ICEBind
+func (b *ICEBind) GetICEMux() (*UniversalUDPMuxDefault, error) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	if b.udpMux == nil {
+		return nil, fmt.Errorf("ICEBind has not been initialized yet")
+	}
+
+	return b.udpMux, nil
+}
+
+// Open creates a WireGuard socket and an instance of UDPMux that is used to glue up ICE and WireGuard for hole punching
+func (b *ICEBind) Open(uport uint16) ([]conn.ReceiveFunc, uint16, error) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	if b.ipv4 != nil {
+		return nil, 0, conn.ErrBindAlreadyOpen
+	}
+
+	var err error
+	b.ipv4, _, err = listenNet("udp4", int(uport))
+	if err != nil && !errors.Is(err, syscall.EAFNOSUPPORT) {
+		return nil, 0, err
+	}
+
+	b.udpMux = NewUniversalUDPMuxDefault(UniversalUDPMuxParams{UDPConn: b.ipv4, Net: b.transportNet})
+
+	portAddr, err := netip.ParseAddrPort(b.ipv4.LocalAddr().String())
+	if err != nil {
+		return nil, 0, err
+	}
+
+	log.Infof("opened ICEBind on %s", b.ipv4.LocalAddr().String())
+
+	return []conn.ReceiveFunc{
+			b.makeReceiveIPv4(b.ipv4),
+		},
+		portAddr.Port(), nil
+}
+
+func listenNet(network string, port int) (*net.UDPConn, int, error) {
+	c, err := net.ListenUDP(network, &net.UDPAddr{Port: port})
+	if err != nil {
+		return nil, 0, err
+	}
+
+	lAddr := c.LocalAddr()
+	uAddr, err := net.ResolveUDPAddr(
+		lAddr.Network(),
+		lAddr.String(),
+	)
+	if err != nil {
+		return nil, 0, err
+	}
+	return c, uAddr.Port, nil
+}
+
+func parseSTUNMessage(raw []byte) (*stun.Message, error) {
+	msg := &stun.Message{
+		Raw: raw,
+	}
+	if err := msg.Decode(); err != nil {
+		return nil, err
+	}
+
+	return msg, nil
+}
+
+func (b *ICEBind) makeReceiveIPv4(c net.PacketConn) conn.ReceiveFunc {
+	return func(buff []byte) (int, conn.Endpoint, error) {
+		n, endpoint, err := c.ReadFrom(buff)
+		if err != nil {
+			return 0, nil, err
+		}
+		e, err := netip.ParseAddrPort(endpoint.String())
+		if err != nil {
+			return 0, nil, err
+		}
+		if !stun.IsMessage(buff) {
+			// WireGuard traffic
+			return n, (conn.StdNetEndpoint)(netip.AddrPortFrom(e.Addr(), e.Port())), nil
+		}
+
+		msg, err := parseSTUNMessage(buff[:n])
+		if err != nil {
+			return 0, nil, err
+		}
+
+		err = b.udpMux.HandleSTUNMessage(msg, endpoint)
+		if err != nil {
+			log.Warnf("failed to handle packet")
+		}
+
+		// discard packets because they are STUN related
+		return 0, nil, nil //todo proper return
+	}
+}
+
+// Close closes the WireGuard socket and UDPMux
+func (b *ICEBind) Close() error {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	var err1, err2 error
+	if b.ipv4 != nil {
+		c := b.ipv4
+		b.ipv4 = nil
+		err1 = c.Close()
+	}
+
+	if b.udpMux != nil {
+		m := b.udpMux
+		b.udpMux = nil
+		err2 = m.Close()
+	}
+
+	if err1 != nil {
+		return err1
+	}
+
+	return err2
+}
+
+// SetMark sets the mark for each packet sent through this Bind.
+// This mark is passed to the kernel as the socket option SO_MARK.
+func (b *ICEBind) SetMark(mark uint32) error {
+	return nil
+}
+
+// Send bytes to the remote endpoint (peer)
+func (b *ICEBind) Send(buff []byte, endpoint conn.Endpoint) error {
+
+	nend, ok := endpoint.(conn.StdNetEndpoint)
+	if !ok {
+		return conn.ErrWrongEndpointType
+	}
+	addrPort := netip.AddrPort(nend)
+	_, err := b.ipv4.WriteTo(buff, &net.UDPAddr{
+		IP:   addrPort.Addr().AsSlice(),
+		Port: int(addrPort.Port()),
+		Zone: addrPort.Addr().Zone(),
+	})
+	return err
+}
+
+// ParseEndpoint creates a new endpoint from a string.
+func (b *ICEBind) ParseEndpoint(s string) (ep conn.Endpoint, err error) {
+	e, err := netip.ParseAddrPort(s)
+	return asEndpoint(e), err
+}
+
+// endpointPool contains a re-usable set of mapping from netip.AddrPort to Endpoint.
+// This exists to reduce allocations: Putting a netip.AddrPort in an Endpoint allocates,
+// but Endpoints are immutable, so we can re-use them.
+var endpointPool = sync.Pool{
+	New: func() any {
+		return make(map[netip.AddrPort]conn.Endpoint)
+	},
+}
+
+// asEndpoint returns an Endpoint containing ap.
+func asEndpoint(ap netip.AddrPort) conn.Endpoint {
+	m := endpointPool.Get().(map[netip.AddrPort]conn.Endpoint)
+	defer endpointPool.Put(m)
+	e, ok := m[ap]
+	if !ok {
+		e = conn.Endpoint(conn.StdNetEndpoint(ap))
+		m[ap] = e
+	}
+	return e
+}

iface/bind/udp_mux.go

@@ -0,0 +1,445 @@
+package bind
+
+import (
+	"fmt"
+	"io"
+	"net"
+	"strings"
+	"sync"
+
+	"github.com/pion/ice/v2"
+	"github.com/pion/stun"
+	"github.com/pion/transport/v2/stdnet"
+	log "github.com/sirupsen/logrus"
+
+	"github.com/pion/logging"
+	"github.com/pion/transport/v2"
+)
+
+/*
+ Most of this code was copied from https://github.com/pion/ice and modified to fulfill NetBird's requirements
+*/
+
+const receiveMTU = 8192
+
+// UDPMuxDefault is an implementation of the interface
+type UDPMuxDefault struct {
+	params UDPMuxParams
+
+	closedChan chan struct{}
+	closeOnce  sync.Once
+
+	// connsIPv4 and connsIPv6 are maps of all udpMuxedConn indexed by ufrag|network|candidateType
+	connsIPv4, connsIPv6 map[string]*udpMuxedConn
+
+	addressMapMu sync.RWMutex
+	addressMap   map[string][]*udpMuxedConn
+
+	// buffer pool to recycle buffers for net.UDPAddr encodes/decodes
+	pool *sync.Pool
+
+	mu sync.Mutex
+
+	// for UDP connection listen at unspecified address
+	localAddrsForUnspecified []net.Addr
+}
+
+const maxAddrSize = 512
+
+// UDPMuxParams are parameters for UDPMux.
+type UDPMuxParams struct {
+	Logger  logging.LeveledLogger
+	UDPConn net.PacketConn
+
+	// Required for gathering local addresses
+	// in case a un UDPConn is passed which does not
+	// bind to a specific local address.
+	Net             transport.Net
+	InterfaceFilter func(interfaceName string) bool
+}
+
+func localInterfaces(n transport.Net, interfaceFilter func(string) bool, ipFilter func(net.IP) bool, networkTypes []ice.NetworkType, includeLoopback bool) ([]net.IP, error) { //nolint:gocognit
+	ips := []net.IP{}
+	ifaces, err := n.Interfaces()
+	if err != nil {
+		return ips, err
+	}
+
+	var IPv4Requested, IPv6Requested bool
+	for _, typ := range networkTypes {
+		if typ.IsIPv4() {
+			IPv4Requested = true
+		}
+
+		if typ.IsIPv6() {
+			IPv6Requested = true
+		}
+	}
+
+	for _, iface := range ifaces {
+		if iface.Flags&net.FlagUp == 0 {
+			continue // interface down
+		}
+		if (iface.Flags&net.FlagLoopback != 0) && !includeLoopback {
+			continue // loopback interface
+		}
+
+		if interfaceFilter != nil && !interfaceFilter(iface.Name) {
+			continue
+		}
+
+		addrs, err := iface.Addrs()
+		if err != nil {
+			continue
+		}
+
+		for _, addr := range addrs {
+			var ip net.IP
+			switch addr := addr.(type) {
+			case *net.IPNet:
+				ip = addr.IP
+			case *net.IPAddr:
+				ip = addr.IP
+			}
+			if ip == nil || (ip.IsLoopback() && !includeLoopback) {
+				continue
+			}
+
+			if ipv4 := ip.To4(); ipv4 == nil {
+				if !IPv6Requested {
+					continue
+				} else if !isSupportedIPv6(ip) {
+					continue
+				}
+			} else if !IPv4Requested {
+				continue
+			}
+
+			if ipFilter != nil && !ipFilter(ip) {
+				continue
+			}
+
+			ips = append(ips, ip)
+		}
+	}
+	return ips, nil
+}
+
+// The conditions of invalidation written below are defined in
+// https://tools.ietf.org/html/rfc8445#section-5.1.1.1
+func isSupportedIPv6(ip net.IP) bool {
+	if len(ip) != net.IPv6len ||
+		isZeros(ip[0:12]) || // !(IPv4-compatible IPv6)
+		ip[0] == 0xfe && ip[1]&0xc0 == 0xc0 || // !(IPv6 site-local unicast)
+		ip.IsLinkLocalUnicast() ||
+		ip.IsLinkLocalMulticast() {
+		return false
+	}
+	return true
+}
+
+func isZeros(ip net.IP) bool {
+	for i := 0; i < len(ip); i++ {
+		if ip[i] != 0 {
+			return false
+		}
+	}
+	return true
+}
+
+// NewUDPMuxDefault creates an implementation of UDPMux
+func NewUDPMuxDefault(params UDPMuxParams) *UDPMuxDefault {
+	if params.Logger == nil {
+		params.Logger = logging.NewDefaultLoggerFactory().NewLogger("ice")
+	}
+
+	var localAddrsForUnspecified []net.Addr
+	if addr, ok := params.UDPConn.LocalAddr().(*net.UDPAddr); !ok {
+		params.Logger.Errorf("LocalAddr is not a net.UDPAddr, got %T", params.UDPConn.LocalAddr())
+	} else if ok && addr.IP.IsUnspecified() {
+		// For unspecified addresses, the correct behavior is to return errListenUnspecified, but
+		// it will break the applications that are already using unspecified UDP connection
+		// with UDPMuxDefault, so print a warn log and create a local address list for mux.
+		params.Logger.Warn("UDPMuxDefault should not listening on unspecified address, use NewMultiUDPMuxFromPort instead")
+		var networks []ice.NetworkType
+		switch {
+		case addr.IP.To4() != nil:
+			networks = []ice.NetworkType{ice.NetworkTypeUDP4}
+
+		case addr.IP.To16() != nil:
+			networks = []ice.NetworkType{ice.NetworkTypeUDP4, ice.NetworkTypeUDP6}
+
+		default:
+			params.Logger.Errorf("LocalAddr expected IPV4 or IPV6, got %T", params.UDPConn.LocalAddr())
+		}
+		if len(networks) > 0 {
+			if params.Net == nil {
+				var err error
+				if params.Net, err = stdnet.NewNet(); err != nil {
+					params.Logger.Errorf("failed to get create network: %v", err)
+				}
+			}
+
+			ips, err := localInterfaces(params.Net, params.InterfaceFilter, nil, networks, true)
+			if err == nil {
+				for _, ip := range ips {
+					localAddrsForUnspecified = append(localAddrsForUnspecified, &net.UDPAddr{IP: ip, Port: addr.Port})
+				}
+			} else {
+				params.Logger.Errorf("failed to get local interfaces for unspecified addr: %v", err)
+			}
+		}
+	}
+
+	return &UDPMuxDefault{
+		addressMap: map[string][]*udpMuxedConn{},
+		params:     params,
+		connsIPv4:  make(map[string]*udpMuxedConn),
+		connsIPv6:  make(map[string]*udpMuxedConn),
+		closedChan: make(chan struct{}, 1),
+		pool: &sync.Pool{
+			New: func() interface{} {
+				// big enough buffer to fit both packet and address
+				return newBufferHolder(receiveMTU + maxAddrSize)
+			},
+		},
+		localAddrsForUnspecified: localAddrsForUnspecified,
+	}
+}
+
+// LocalAddr returns the listening address of this UDPMuxDefault
+func (m *UDPMuxDefault) LocalAddr() net.Addr {
+	return m.params.UDPConn.LocalAddr()
+}
+
+// GetListenAddresses returns the list of addresses that this mux is listening on
+func (m *UDPMuxDefault) GetListenAddresses() []net.Addr {
+	if len(m.localAddrsForUnspecified) > 0 {
+		return m.localAddrsForUnspecified
+	}
+
+	return []net.Addr{m.LocalAddr()}
+}
+
+// GetConn returns a PacketConn given the connection's ufrag and network address
+// creates the connection if an existing one can't be found
+func (m *UDPMuxDefault) GetConn(ufrag string, addr net.Addr) (net.PacketConn, error) {
+
+	var isIPv6 bool
+	if udpAddr, _ := addr.(*net.UDPAddr); udpAddr != nil && udpAddr.IP.To4() == nil {
+		isIPv6 = true
+	}
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	if m.IsClosed() {
+		return nil, io.ErrClosedPipe
+	}
+
+	if conn, ok := m.getConn(ufrag, isIPv6); ok {
+		return conn, nil
+	}
+
+	c := m.createMuxedConn(ufrag)
+	go func() {
+		<-c.CloseChannel()
+		m.RemoveConnByUfrag(ufrag)
+	}()
+
+	if isIPv6 {
+		m.connsIPv6[ufrag] = c
+	} else {
+		m.connsIPv4[ufrag] = c
+	}
+
+	return c, nil
+}
+
+// RemoveConnByUfrag stops and removes the muxed packet connection
+func (m *UDPMuxDefault) RemoveConnByUfrag(ufrag string) {
+	removedConns := make([]*udpMuxedConn, 0, 2)
+
+	// Keep lock section small to avoid deadlock with conn lock
+	m.mu.Lock()
+	if c, ok := m.connsIPv4[ufrag]; ok {
+		delete(m.connsIPv4, ufrag)
+		removedConns = append(removedConns, c)
+	}
+	if c, ok := m.connsIPv6[ufrag]; ok {
+		delete(m.connsIPv6, ufrag)
+		removedConns = append(removedConns, c)
+	}
+	m.mu.Unlock()
+
+	if len(removedConns) == 0 {
+		// No need to lock if no connection was found
+		return
+	}
+
+	m.addressMapMu.Lock()
+	defer m.addressMapMu.Unlock()
+
+	for _, c := range removedConns {
+		addresses := c.getAddresses()
+		for _, addr := range addresses {
+			if connList, ok := m.addressMap[addr]; ok {
+				var newList []*udpMuxedConn
+				for _, conn := range connList {
+					if conn.params.Key != ufrag {
+						newList = append(newList, conn)
+					}
+				}
+				m.addressMap[addr] = newList
+			}
+		}
+	}
+}
+
+// IsClosed returns true if the mux had been closed
+func (m *UDPMuxDefault) IsClosed() bool {
+	select {
+	case <-m.closedChan:
+		return true
+	default:
+		return false
+	}
+}
+
+// Close the mux, no further connections could be created
+func (m *UDPMuxDefault) Close() error {
+	var err error
+	m.closeOnce.Do(func() {
+		m.mu.Lock()
+		defer m.mu.Unlock()
+
+		for _, c := range m.connsIPv4 {
+			_ = c.Close()
+		}
+		for _, c := range m.connsIPv6 {
+			_ = c.Close()
+		}
+
+		m.connsIPv4 = make(map[string]*udpMuxedConn)
+		m.connsIPv6 = make(map[string]*udpMuxedConn)
+
+		close(m.closedChan)
+
+		_ = m.params.UDPConn.Close()
+	})
+	return err
+}
+
+func (m *UDPMuxDefault) writeTo(buf []byte, rAddr net.Addr) (n int, err error) {
+	return m.params.UDPConn.WriteTo(buf, rAddr)
+}
+
+func (m *UDPMuxDefault) registerConnForAddress(conn *udpMuxedConn, addr string) {
+	if m.IsClosed() {
+		return
+	}
+
+	m.addressMapMu.Lock()
+	defer m.addressMapMu.Unlock()
+
+	existing, ok := m.addressMap[addr]
+	if !ok {
+		existing = []*udpMuxedConn{}
+	}
+	existing = append(existing, conn)
+	m.addressMap[addr] = existing
+
+	log.Debugf("ICE: registered %s for %s", addr, conn.params.Key)
+}
+
+func (m *UDPMuxDefault) createMuxedConn(key string) *udpMuxedConn {
+	c := newUDPMuxedConn(&udpMuxedConnParams{
+		Mux:       m,
+		Key:       key,
+		AddrPool:  m.pool,
+		LocalAddr: m.LocalAddr(),
+		Logger:    m.params.Logger,
+	})
+	return c
+}
+
+// HandleSTUNMessage handles STUN packets and forwards them to underlying pion/ice library
+func (m *UDPMuxDefault) HandleSTUNMessage(msg *stun.Message, addr net.Addr) error {
+
+	remoteAddr, ok := addr.(*net.UDPAddr)
+	if !ok {
+		return fmt.Errorf("underlying PacketConn did not return a UDPAddr")
+	}
+
+	// If we have already seen this address dispatch to the appropriate destination
+	// If you are using the same socket for the Host and SRFLX candidates, it might be that there are more than one
+	// muxed connection - one for the SRFLX candidate and the other one for the HOST one.
+	// We will then forward STUN packets to each of these connections.
+	m.addressMapMu.Lock()
+	var destinationConnList []*udpMuxedConn
+	if storedConns, ok := m.addressMap[addr.String()]; ok {
+		destinationConnList = append(destinationConnList, storedConns...)
+	}
+	m.addressMapMu.Unlock()
+
+	var isIPv6 bool
+	if udpAddr, _ := addr.(*net.UDPAddr); udpAddr != nil && udpAddr.IP.To4() == nil {
+		isIPv6 = true
+	}
+
+	// This block is needed to discover Peer Reflexive Candidates for which we don't know the Endpoint upfront.
+	// However, we can take a username attribute from the STUN message which contains ufrag.
+	// We can use ufrag to identify the destination conn to route packet to.
+	attr, stunAttrErr := msg.Get(stun.AttrUsername)
+	if stunAttrErr == nil {
+		ufrag := strings.Split(string(attr), ":")[0]
+
+		m.mu.Lock()
+		destinationConn := m.connsIPv4[ufrag]
+		if isIPv6 {
+			destinationConn = m.connsIPv6[ufrag]
+		}
+
+		if destinationConn != nil {
+			exists := false
+			for _, conn := range destinationConnList {
+				if conn.params.Key == destinationConn.params.Key {
+					exists = true
+					break
+				}
+			}
+			if !exists {
+				destinationConnList = append(destinationConnList, destinationConn)
+			}
+		}
+		m.mu.Unlock()
+	}
+
+	// Forward STUN packets to each destination connections even thought the STUN packet might not belong there.
+	// It will be discarded by the further ICE candidate logic if so.
+	for _, conn := range destinationConnList {
+		if err := conn.writePacket(msg.Raw, remoteAddr); err != nil {
+			log.Errorf("could not write packet: %v", err)
+		}
+	}
+
+	return nil
+}
+
+func (m *UDPMuxDefault) getConn(ufrag string, isIPv6 bool) (val *udpMuxedConn, ok bool) {
+	if isIPv6 {
+		val, ok = m.connsIPv6[ufrag]
+	} else {
+		val, ok = m.connsIPv4[ufrag]
+	}
+	return
+}
+
+type bufferHolder struct {
+	buf []byte
+}
+
+func newBufferHolder(size int) *bufferHolder {
+	return &bufferHolder{
+		buf: make([]byte, size),
+	}
+}

iface/bind/udp_mux_universal.go

@@ -0,0 +1,254 @@
+package bind
+
+/*
+ Most of this code was copied from https://github.com/pion/ice and modified to fulfill NetBird's requirements.
+*/
+
+import (
+	"fmt"
+	"net"
+	"time"
+
+	log "github.com/sirupsen/logrus"
+
+	"github.com/pion/logging"
+	"github.com/pion/stun"
+	"github.com/pion/transport/v2"
+)
+
+// UniversalUDPMuxDefault handles STUN and TURN servers packets by wrapping the original UDPConn
+// It then passes packets to the UDPMux that does the actual connection muxing.
+type UniversalUDPMuxDefault struct {
+	*UDPMuxDefault
+	params UniversalUDPMuxParams
+
+	// since we have a shared socket, for srflx candidates it makes sense to have a shared mapped address across all the agents
+	// stun.XORMappedAddress indexed by the STUN server addr
+	xorMappedMap map[string]*xorMapped
+}
+
+// UniversalUDPMuxParams are parameters for UniversalUDPMux server reflexive.
+type UniversalUDPMuxParams struct {
+	Logger                logging.LeveledLogger
+	UDPConn               net.PacketConn
+	XORMappedAddrCacheTTL time.Duration
+	Net                   transport.Net
+}
+
+// NewUniversalUDPMuxDefault creates an implementation of UniversalUDPMux embedding UDPMux
+func NewUniversalUDPMuxDefault(params UniversalUDPMuxParams) *UniversalUDPMuxDefault {
+	if params.Logger == nil {
+		params.Logger = logging.NewDefaultLoggerFactory().NewLogger("ice")
+	}
+	if params.XORMappedAddrCacheTTL == 0 {
+		params.XORMappedAddrCacheTTL = time.Second * 25
+	}
+
+	m := &UniversalUDPMuxDefault{
+		params:       params,
+		xorMappedMap: make(map[string]*xorMapped),
+	}
+
+	// wrap UDP connection, process server reflexive messages
+	// before they are passed to the UDPMux connection handler (connWorker)
+	m.params.UDPConn = &udpConn{
+		PacketConn: params.UDPConn,
+		mux:        m,
+		logger:     params.Logger,
+	}
+
+	// embed UDPMux
+	udpMuxParams := UDPMuxParams{
+		Logger:  params.Logger,
+		UDPConn: m.params.UDPConn,
+		Net:     m.params.Net,
+	}
+	m.UDPMuxDefault = NewUDPMuxDefault(udpMuxParams)
+
+	return m
+}
+
+// udpConn is a wrapper around UDPMux conn that overrides ReadFrom and handles STUN/TURN packets
+type udpConn struct {
+	net.PacketConn
+	mux    *UniversalUDPMuxDefault
+	logger logging.LeveledLogger
+}
+
+// GetListenAddresses returns the listen addr of this UDP
+func (m *UniversalUDPMuxDefault) GetListenAddresses() []net.Addr {
+	return []net.Addr{m.LocalAddr()}
+}
+
+// GetRelayedAddr creates relayed connection to the given TURN service and returns the relayed addr.
+// Not implemented yet.
+func (m *UniversalUDPMuxDefault) GetRelayedAddr(turnAddr net.Addr, deadline time.Duration) (*net.Addr, error) {
+	return nil, fmt.Errorf("not implemented yet")
+}
+
+// GetConnForURL add uniques to the muxed connection by concatenating ufrag and URL (e.g. STUN URL) to be able to support multiple STUN/TURN servers
+// and return a unique connection per server.
+func (m *UniversalUDPMuxDefault) GetConnForURL(ufrag string, url string, addr net.Addr) (net.PacketConn, error) {
+	return m.UDPMuxDefault.GetConn(fmt.Sprintf("%s%s", ufrag, url), addr)
+}
+
+// HandleSTUNMessage discovers STUN packets that carry a XOR mapped address from a STUN server.
+// All other STUN packets will be forwarded to the UDPMux
+func (m *UniversalUDPMuxDefault) HandleSTUNMessage(msg *stun.Message, addr net.Addr) error {
+
+	udpAddr, ok := addr.(*net.UDPAddr)
+	if !ok {
+		// message about this err will be logged in the UDPMux
+		return nil
+	}
+
+	if m.isXORMappedResponse(msg, udpAddr.String()) {
+		err := m.handleXORMappedResponse(udpAddr, msg)
+		if err != nil {
+			log.Debugf("%s: %v", fmt.Errorf("failed to get XOR-MAPPED-ADDRESS response"), err)
+			return nil
+		}
+		return nil
+	}
+	return m.UDPMuxDefault.HandleSTUNMessage(msg, addr)
+}
+
+// isXORMappedResponse indicates whether the message is a XORMappedAddress and is coming from the known STUN server.
+func (m *UniversalUDPMuxDefault) isXORMappedResponse(msg *stun.Message, stunAddr string) bool {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	// check first if it is a STUN server address because remote peer can also send similar messages but as a BindingSuccess
+	_, ok := m.xorMappedMap[stunAddr]
+	_, err := msg.Get(stun.AttrXORMappedAddress)
+	return err == nil && ok
+}
+
+// handleXORMappedResponse parses response from the STUN server, extracts XORMappedAddress attribute
+// and set the mapped address for the server
+func (m *UniversalUDPMuxDefault) handleXORMappedResponse(stunAddr *net.UDPAddr, msg *stun.Message) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	mappedAddr, ok := m.xorMappedMap[stunAddr.String()]
+	if !ok {
+		return fmt.Errorf("no XOR address mapping")
+	}
+
+	var addr stun.XORMappedAddress
+	if err := addr.GetFrom(msg); err != nil {
+		return err
+	}
+
+	m.xorMappedMap[stunAddr.String()] = mappedAddr
+	mappedAddr.SetAddr(&addr)
+
+	return nil
+}
+
+// GetXORMappedAddr returns *stun.XORMappedAddress if already present for a given STUN server.
+// Makes a STUN binding request to discover mapped address otherwise.
+// Blocks until the stun.XORMappedAddress has been discovered or deadline.
+// Method is safe for concurrent use.
+func (m *UniversalUDPMuxDefault) GetXORMappedAddr(serverAddr net.Addr, deadline time.Duration) (*stun.XORMappedAddress, error) {
+	m.mu.Lock()
+	mappedAddr, ok := m.xorMappedMap[serverAddr.String()]
+	// if we already have a mapping for this STUN server (address already received)
+	// and if it is not too old we return it without making a new request to STUN server
+	if ok {
+		if mappedAddr.expired() {
+			mappedAddr.closeWaiters()
+			delete(m.xorMappedMap, serverAddr.String())
+			ok = false
+		} else if mappedAddr.pending() {
+			ok = false
+		}
+	}
+	m.mu.Unlock()
+	if ok {
+		return mappedAddr.addr, nil
+	}
+
+	// otherwise, make a STUN request to discover the address
+	// or wait for already sent request to complete
+	waitAddrReceived, err := m.sendStun(serverAddr)
+	if err != nil {
+		return nil, fmt.Errorf("%s: %s", "failed to send STUN packet", err)
+	}
+
+	// block until response was handled by the connWorker routine and XORMappedAddress was updated
+	select {
+	case <-waitAddrReceived:
+		// when channel closed, addr was obtained
+		m.mu.Lock()
+		mappedAddr := *m.xorMappedMap[serverAddr.String()]
+		m.mu.Unlock()
+		if mappedAddr.addr == nil {
+			return nil, fmt.Errorf("no XOR address mapping")
+		}
+		return mappedAddr.addr, nil
+	case <-time.After(deadline):
+		return nil, fmt.Errorf("timeout while waiting for XORMappedAddr")
+	}
+}
+
+// sendStun sends a STUN request via UDP conn.
+//
+// The returned channel is closed when the STUN response has been received.
+// Method is safe for concurrent use.
+func (m *UniversalUDPMuxDefault) sendStun(serverAddr net.Addr) (chan struct{}, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	// if record present in the map, we already sent a STUN request,
+	// just wait when waitAddrReceived will be closed
+	addrMap, ok := m.xorMappedMap[serverAddr.String()]
+	if !ok {
+		addrMap = &xorMapped{
+			expiresAt:        time.Now().Add(m.params.XORMappedAddrCacheTTL),
+			waitAddrReceived: make(chan struct{}),
+		}
+		m.xorMappedMap[serverAddr.String()] = addrMap
+	}
+
+	req, err := stun.Build(stun.BindingRequest, stun.TransactionID)
+	if err != nil {
+		return nil, err
+	}
+
+	if _, err = m.params.UDPConn.WriteTo(req.Raw, serverAddr); err != nil {
+		return nil, err
+	}
+
+	return addrMap.waitAddrReceived, nil
+}
+
+type xorMapped struct {
+	addr             *stun.XORMappedAddress
+	waitAddrReceived chan struct{}
+	expiresAt        time.Time
+}
+
+func (a *xorMapped) closeWaiters() {
+	select {
+	case <-a.waitAddrReceived:
+		// notify was close, ok, that means we received duplicate response
+		// just exit
+		break
+	default:
+		// notify tha twe have a new addr
+		close(a.waitAddrReceived)
+	}
+}
+
+func (a *xorMapped) pending() bool {
+	return a.addr == nil
+}
+
+func (a *xorMapped) expired() bool {
+	return a.expiresAt.Before(time.Now())
+}
+
+func (a *xorMapped) SetAddr(addr *stun.XORMappedAddress) {
+	a.addr = addr
+	a.closeWaiters()
+}

iface/bind/udp_muxed_conn.go

@@ -0,0 +1,233 @@
+package bind
+
+/*
+ Most of this code was copied from https://github.com/pion/ice and modified to fulfill NetBird's requirements
+*/
+
+import (
+	"encoding/binary"
+	"io"
+	"net"
+	"sync"
+	"time"
+
+	"github.com/pion/logging"
+	"github.com/pion/transport/v2/packetio"
+)
+
+type udpMuxedConnParams struct {
+	Mux       *UDPMuxDefault
+	AddrPool  *sync.Pool
+	Key       string
+	LocalAddr net.Addr
+	Logger    logging.LeveledLogger
+}
+
+// udpMuxedConn represents a logical packet conn for a single remote as identified by ufrag
+type udpMuxedConn struct {
+	params *udpMuxedConnParams
+	// remote addresses that we have sent to on this conn
+	addresses []string
+
+	// channel holding incoming packets
+	buf        *packetio.Buffer
+	closedChan chan struct{}
+	closeOnce  sync.Once
+	mu         sync.Mutex
+}
+
+func newUDPMuxedConn(params *udpMuxedConnParams) *udpMuxedConn {
+	p := &udpMuxedConn{
+		params:     params,
+		buf:        packetio.NewBuffer(),
+		closedChan: make(chan struct{}),
+	}
+
+	return p
+}
+
+func (c *udpMuxedConn) ReadFrom(b []byte) (n int, rAddr net.Addr, err error) {
+	buf := c.params.AddrPool.Get().(*bufferHolder) //nolint:forcetypeassert
+	defer c.params.AddrPool.Put(buf)
+
+	// read address
+	total, err := c.buf.Read(buf.buf)
+	if err != nil {
+		return 0, nil, err
+	}
+
+	dataLen := int(binary.LittleEndian.Uint16(buf.buf[:2]))
+	if dataLen > total || dataLen > len(b) {
+		return 0, nil, io.ErrShortBuffer
+	}
+
+	// read data and then address
+	offset := 2
+	copy(b, buf.buf[offset:offset+dataLen])
+	offset += dataLen
+
+	// read address len & decode address
+	addrLen := int(binary.LittleEndian.Uint16(buf.buf[offset : offset+2]))
+	offset += 2
+
+	if rAddr, err = decodeUDPAddr(buf.buf[offset : offset+addrLen]); err != nil {
+		return 0, nil, err
+	}
+
+	return dataLen, rAddr, nil
+}
+
+func (c *udpMuxedConn) WriteTo(buf []byte, rAddr net.Addr) (n int, err error) {
+	if c.isClosed() {
+		return 0, io.ErrClosedPipe
+	}
+	// each time we write to a new address, we'll register it with the mux
+	addr := rAddr.String()
+	if !c.containsAddress(addr) {
+		c.addAddress(addr)
+	}
+
+	return c.params.Mux.writeTo(buf, rAddr)
+}
+
+func (c *udpMuxedConn) LocalAddr() net.Addr {
+	return c.params.LocalAddr
+}
+
+func (c *udpMuxedConn) SetDeadline(tm time.Time) error {
+	return nil
+}
+
+func (c *udpMuxedConn) SetReadDeadline(tm time.Time) error {
+	return nil
+}
+
+func (c *udpMuxedConn) SetWriteDeadline(tm time.Time) error {
+	return nil
+}
+
+func (c *udpMuxedConn) CloseChannel() <-chan struct{} {
+	return c.closedChan
+}
+
+func (c *udpMuxedConn) Close() error {
+	var err error
+	c.closeOnce.Do(func() {
+		err = c.buf.Close()
+		close(c.closedChan)
+	})
+	return err
+}
+
+func (c *udpMuxedConn) isClosed() bool {
+	select {
+	case <-c.closedChan:
+		return true
+	default:
+		return false
+	}
+}
+
+func (c *udpMuxedConn) getAddresses() []string {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	addresses := make([]string, len(c.addresses))
+	copy(addresses, c.addresses)
+	return addresses
+}
+
+func (c *udpMuxedConn) addAddress(addr string) {
+	c.mu.Lock()
+	c.addresses = append(c.addresses, addr)
+	c.mu.Unlock()
+
+	// map it on mux
+	c.params.Mux.registerConnForAddress(c, addr)
+}
+
+func (c *udpMuxedConn) containsAddress(addr string) bool {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	for _, a := range c.addresses {
+		if addr == a {
+			return true
+		}
+	}
+	return false
+}
+
+func (c *udpMuxedConn) writePacket(data []byte, addr *net.UDPAddr) error {
+	// write two packets, address and data
+	buf := c.params.AddrPool.Get().(*bufferHolder) //nolint:forcetypeassert
+	defer c.params.AddrPool.Put(buf)
+
+	// format of buffer | data len | data bytes | addr len | addr bytes |
+	if len(buf.buf) < len(data)+maxAddrSize {
+		return io.ErrShortBuffer
+	}
+	// data len
+	binary.LittleEndian.PutUint16(buf.buf, uint16(len(data)))
+	offset := 2
+
+	// data
+	copy(buf.buf[offset:], data)
+	offset += len(data)
+
+	// write address first, leaving room for its length
+	n, err := encodeUDPAddr(addr, buf.buf[offset+2:])
+	if err != nil {
+		return err
+	}
+	total := offset + n + 2
+
+	// address len
+	binary.LittleEndian.PutUint16(buf.buf[offset:], uint16(n))
+
+	if _, err := c.buf.Write(buf.buf[:total]); err != nil {
+		return err
+	}
+	return nil
+}
+
+func encodeUDPAddr(addr *net.UDPAddr, buf []byte) (int, error) {
+	ipData, err := addr.IP.MarshalText()
+	if err != nil {
+		return 0, err
+	}
+	total := 2 + len(ipData) + 2 + len(addr.Zone)
+	if total > len(buf) {
+		return 0, io.ErrShortBuffer
+	}
+
+	binary.LittleEndian.PutUint16(buf, uint16(len(ipData)))
+	offset := 2
+	n := copy(buf[offset:], ipData)
+	offset += n
+	binary.LittleEndian.PutUint16(buf[offset:], uint16(addr.Port))
+	offset += 2
+	copy(buf[offset:], addr.Zone)
+	return total, nil
+}
+
+func decodeUDPAddr(buf []byte) (*net.UDPAddr, error) {
+	addr := net.UDPAddr{}
+
+	offset := 0
+	ipLen := int(binary.LittleEndian.Uint16(buf[:2]))
+	offset += 2
+	// basic bounds checking
+	if ipLen+offset > len(buf) {
+		return nil, io.ErrShortBuffer
+	}
+	if err := addr.IP.UnmarshalText(buf[offset : offset+ipLen]); err != nil {
+		return nil, err
+	}
+	offset += ipLen
+	addr.Port = int(binary.LittleEndian.Uint16(buf[offset : offset+2]))
+	offset += 2
+	zone := make([]byte, len(buf[offset:]))
+	copy(zone, buf[offset:])
+	addr.Zone = string(zone)
+
+	return &addr, nil
+}

iface/iface.go

@@ -5,6 +5,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/netbirdio/netbird/iface/bind"
+
 	log "github.com/sirupsen/logrus"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 )
@@ -19,6 +21,17 @@ type WGIface struct {
 	tun           *tunDevice
 	configurer    wGConfigurer
 	mu            sync.Mutex
+	userspaceBind bool
+}
+
+// IsUserspaceBind indicates whether this interfaces is userspace with bind.ICEBind
+func (w *WGIface) IsUserspaceBind() bool {
+	return w.userspaceBind
+}
+
+// GetBind returns a userspace implementation of WireGuard Bind interface
+func (w *WGIface) GetBind() *bind.ICEBind {
+	return w.tun.iceBind
 }
 
 // Create creates a new Wireguard interface, sets a given IP and brings it up.
@@ -26,7 +39,7 @@ type WGIface struct {
 func (w *WGIface) Create() error {
 	w.mu.Lock()
 	defer w.mu.Unlock()
-	log.Debugf("create Wireguard interface %s", w.tun.DeviceName())
+	log.Debugf("create WireGuard interface %s", w.tun.DeviceName())
 	return w.tun.Create()
 }
 

iface/iface_android.go

@@ -1,22 +1,28 @@
 package iface
 
-import "sync"
+import (
+	"sync"
 
-// NewWGIFace Creates a new Wireguard interface instance
+	"github.com/pion/transport/v2"
-func NewWGIFace(ifaceName string, address string, mtu int, tunAdapter TunAdapter) (*WGIface, error) {
+)
-	wgIface := &WGIface{
+
+// NewWGIFace Creates a new WireGuard interface instance
+func NewWGIFace(iFaceName string, address string, mtu int, tunAdapter TunAdapter, transportNet transport.Net) (*WGIface, error) {
+	wgIFace := &WGIface{
 		mu: sync.Mutex{},
 	}
 
 	wgAddress, err := parseWGAddress(address)
 	if err != nil {
-		return wgIface, err
+		return wgIFace, err
 	}
 
-	tun := newTunDevice(wgAddress, mtu, tunAdapter)
+	tun := newTunDevice(wgAddress, mtu, tunAdapter, transportNet)
-	wgIface.tun = tun
+	wgIFace.tun = tun
 
-	wgIface.configurer = newWGConfigurer(tun)
+	wgIFace.configurer = newWGConfigurer(tun)
 
-	return wgIface, nil
+	wgIFace.userspaceBind = !WireGuardModuleIsLoaded()
+
+	return wgIFace, nil
 }

iface/iface_nonandroid.go

@@ -2,21 +2,26 @@
 
 package iface
 
-import "sync"
+import (
+	"sync"
 
-// NewWGIFace Creates a new Wireguard interface instance
+	"github.com/pion/transport/v2"
-func NewWGIFace(ifaceName string, address string, mtu int, tunAdapter TunAdapter) (*WGIface, error) {
+)
-	wgIface := &WGIface{
+
+// NewWGIFace Creates a new WireGuard interface instance
+func NewWGIFace(iFaceName string, address string, mtu int, tunAdapter TunAdapter, transportNet transport.Net) (*WGIface, error) {
+	wgIFace := &WGIface{
 		mu: sync.Mutex{},
 	}
 
 	wgAddress, err := parseWGAddress(address)
 	if err != nil {
-		return wgIface, err
+		return wgIFace, err
 	}
 
-	wgIface.tun = newTunDevice(ifaceName, wgAddress, mtu)
+	wgIFace.tun = newTunDevice(iFaceName, wgAddress, mtu, transportNet)
 
-	wgIface.configurer = newWGConfigurer(ifaceName)
+	wgIFace.configurer = newWGConfigurer(iFaceName)
-	return wgIface, nil
+	wgIFace.userspaceBind = !WireGuardModuleIsLoaded()
+	return wgIFace, nil
 }

iface/iface_test.go

@@ -2,13 +2,15 @@ package iface
 
 import (
 	"fmt"
+	"net"
+	"testing"
+	"time"
+
+	"github.com/pion/transport/v2/stdnet"
 	log "github.com/sirupsen/logrus"
 	"github.com/stretchr/testify/assert"
 	"golang.zx2c4.com/wireguard/wgctrl"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
-	"net"
-	"testing"
-	"time"
 )
 
 // keep darwin compability
@@ -32,7 +34,12 @@ func init() {
 func TestWGIface_UpdateAddr(t *testing.T) {
 	ifaceName := fmt.Sprintf("utun%d", WgIntNumber+4)
 	addr := "100.64.0.1/8"
-	iface, err := NewWGIFace(ifaceName, addr, DefaultMTU, nil)
+	newNet, err := stdnet.NewNet()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	iface, err := NewWGIFace(ifaceName, addr, DefaultMTU, nil, newNet)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -92,7 +99,11 @@ func getIfaceAddrs(ifaceName string) ([]net.Addr, error) {
 func Test_CreateInterface(t *testing.T) {
 	ifaceName := fmt.Sprintf("utun%d", WgIntNumber+1)
 	wgIP := "10.99.99.1/32"
-	iface, err := NewWGIFace(ifaceName, wgIP, DefaultMTU, nil)
+	newNet, err := stdnet.NewNet()
+	if err != nil {
+		t.Fatal(err)
+	}
+	iface, err := NewWGIFace(ifaceName, wgIP, DefaultMTU, nil, newNet)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -121,7 +132,11 @@ func Test_CreateInterface(t *testing.T) {
 func Test_Close(t *testing.T) {
 	ifaceName := fmt.Sprintf("utun%d", WgIntNumber+2)
 	wgIP := "10.99.99.2/32"
-	iface, err := NewWGIFace(ifaceName, wgIP, DefaultMTU, nil)
+	newNet, err := stdnet.NewNet()
+	if err != nil {
+		t.Fatal(err)
+	}
+	iface, err := NewWGIFace(ifaceName, wgIP, DefaultMTU, nil, newNet)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -149,7 +164,11 @@ func Test_Close(t *testing.T) {
 func Test_ConfigureInterface(t *testing.T) {
 	ifaceName := fmt.Sprintf("utun%d", WgIntNumber+3)
 	wgIP := "10.99.99.5/30"
-	iface, err := NewWGIFace(ifaceName, wgIP, DefaultMTU, nil)
+	newNet, err := stdnet.NewNet()
+	if err != nil {
+		t.Fatal(err)
+	}
+	iface, err := NewWGIFace(ifaceName, wgIP, DefaultMTU, nil, newNet)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -196,7 +215,11 @@ func Test_ConfigureInterface(t *testing.T) {
 func Test_UpdatePeer(t *testing.T) {
 	ifaceName := fmt.Sprintf("utun%d", WgIntNumber+4)
 	wgIP := "10.99.99.9/30"
-	iface, err := NewWGIFace(ifaceName, wgIP, DefaultMTU, nil)
+	newNet, err := stdnet.NewNet()
+	if err != nil {
+		t.Fatal(err)
+	}
+	iface, err := NewWGIFace(ifaceName, wgIP, DefaultMTU, nil, newNet)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -255,7 +278,11 @@ func Test_UpdatePeer(t *testing.T) {
 func Test_RemovePeer(t *testing.T) {
 	ifaceName := fmt.Sprintf("utun%d", WgIntNumber+4)
 	wgIP := "10.99.99.13/30"
-	iface, err := NewWGIFace(ifaceName, wgIP, DefaultMTU, nil)
+	newNet, err := stdnet.NewNet()
+	if err != nil {
+		t.Fatal(err)
+	}
+	iface, err := NewWGIFace(ifaceName, wgIP, DefaultMTU, nil, newNet)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -304,8 +331,11 @@ func Test_ConnectPeers(t *testing.T) {
 	peer2Key, _ := wgtypes.GeneratePrivateKey()
 
 	keepAlive := 1 * time.Second
-
+	newNet, err := stdnet.NewNet()
-	iface1, err := NewWGIFace(peer1ifaceName, peer1wgIP, DefaultMTU, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	iface1, err := NewWGIFace(peer1ifaceName, peer1wgIP, DefaultMTU, nil, newNet)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -322,7 +352,11 @@ func Test_ConnectPeers(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	iface2, err := NewWGIFace(peer2ifaceName, peer2wgIP, DefaultMTU, nil)
+	newNet, err = stdnet.NewNet()
+	if err != nil {
+		t.Fatal(err)
+	}
+	iface2, err := NewWGIFace(peer2ifaceName, peer2wgIP, DefaultMTU, nil, newNet)
 	if err != nil {
 		t.Fatal(err)
 	}

iface/module.go

@@ -3,7 +3,7 @@
 
 package iface
 
-// WireguardModuleIsLoaded check if we can load wireguard mod (linux only)
+// WireGuardModuleIsLoaded check if we can load WireGuard mod (linux only)
-func WireguardModuleIsLoaded() bool {
+func WireGuardModuleIsLoaded() bool {
 	return false
 }

iface/module_linux.go

@@ -7,9 +7,6 @@ import (
 	"bufio"
 	"errors"
 	"fmt"
-	log "github.com/sirupsen/logrus"
-	"github.com/vishvananda/netlink"
-	"golang.org/x/sys/unix"
 	"io"
 	"io/fs"
 	"math"
@@ -17,6 +14,10 @@ import (
 	"path/filepath"
 	"strings"
 	"syscall"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/vishvananda/netlink"
+	"golang.org/x/sys/unix"
 )
 
 // Holds logic to check existence of kernel modules used by wireguard interfaces
@@ -33,6 +34,7 @@ const (
 	loading
 	live
 	inuse
+	envDisableWireGuardKernel = "NB_WG_KERNEL_DISABLED"
 )
 
 type module struct {
@@ -81,9 +83,15 @@ func tunModuleIsLoaded() bool {
 	return tunLoaded
 }
 
-// WireguardModuleIsLoaded check if we can load wireguard mod (linux only)
+// WireGuardModuleIsLoaded check if we can load WireGuard mod (linux only)
-func WireguardModuleIsLoaded() bool {
+func WireGuardModuleIsLoaded() bool {
-	if canCreateFakeWireguardInterface() {
+
+	if os.Getenv(envDisableWireGuardKernel) == "true" {
+		log.Debugf("WireGuard kernel module disabled because the %s env is set to true", envDisableWireGuardKernel)
+		return false
+	}
+
+	if canCreateFakeWireGuardInterface() {
 		return true
 	}
 
@@ -96,7 +104,7 @@ func WireguardModuleIsLoaded() bool {
 	return loaded
 }
 
-func canCreateFakeWireguardInterface() bool {
+func canCreateFakeWireGuardInterface() bool {
 	link := newWGLink("mustnotexist")
 
 	// We willingly try to create a device with an invalid

iface/module_linux_test.go

@@ -3,13 +3,14 @@ package iface
 import (
 	"bufio"
 	"bytes"
-	"github.com/stretchr/testify/require"
-	"golang.org/x/sys/unix"
 	"io"
 	"os"
 	"path/filepath"
 	"strings"
 	"testing"
+
+	"github.com/stretchr/testify/require"
+	"golang.org/x/sys/unix"
 )
 
 func TestGetModuleDependencies(t *testing.T) {

iface/tun_android.go

@@ -3,9 +3,12 @@ package iface
 import (
 	"net"
 
+	"github.com/pion/transport/v2"
+
+	"github.com/netbirdio/netbird/iface/bind"
+
 	log "github.com/sirupsen/logrus"
 	"golang.org/x/sys/unix"
-	"golang.zx2c4.com/wireguard/conn"
 	"golang.zx2c4.com/wireguard/device"
 	"golang.zx2c4.com/wireguard/ipc"
 	"golang.zx2c4.com/wireguard/tun"
@@ -20,13 +23,15 @@ type tunDevice struct {
 	name    string
 	device  *device.Device
 	uapi    net.Listener
+	iceBind *bind.ICEBind
 }
 
-func newTunDevice(address WGAddress, mtu int, tunAdapter TunAdapter) *tunDevice {
+func newTunDevice(address WGAddress, mtu int, tunAdapter TunAdapter, transportNet transport.Net) *tunDevice {
 	return &tunDevice{
 		address:    address,
 		mtu:        mtu,
 		tunAdapter: tunAdapter,
+		iceBind:    bind.NewICEBind(transportNet),
 	}
 }
 
@@ -46,7 +51,7 @@ func (t *tunDevice) Create() error {
 	t.name = name
 
 	log.Debugf("attaching to interface %v", name)
-	t.device = device.NewDevice(tunDevice, conn.NewStdNetBind(), device.NewLogger(device.LogLevelSilent, "[wiretrustee] "))
+	t.device = device.NewDevice(tunDevice, t.iceBind, device.NewLogger(device.LogLevelSilent, "[wiretrustee] "))
 	t.device.DisableSomeRoamingForBrokenMobileSemantics()
 
 	log.Debugf("create uapi")

iface/tun_linux.go

@@ -11,7 +11,7 @@ import (
 )
 
 func (c *tunDevice) Create() error {
-	if WireguardModuleIsLoaded() {
+	if WireGuardModuleIsLoaded() {
 		log.Info("using kernel WireGuard")
 		return c.createWithKernel()
 	}
@@ -30,7 +30,7 @@ func (c *tunDevice) Create() error {
 
 }
 
-// createWithKernel Creates a new Wireguard interface using kernel Wireguard module.
+// createWithKernel Creates a new WireGuard interface using kernel WireGuard module.
 // Works for Linux and offers much better network performance
 func (c *tunDevice) createWithKernel() error {
 

iface/tun_unix.go

@@ -6,10 +6,13 @@ import (
 	"net"
 	"os"
 
-	log "github.com/sirupsen/logrus"
+	"github.com/pion/transport/v2"
-	"golang.zx2c4.com/wireguard/conn"
-	"golang.zx2c4.com/wireguard/device"
 	"golang.zx2c4.com/wireguard/ipc"
+
+	"github.com/netbirdio/netbird/iface/bind"
+
+	log "github.com/sirupsen/logrus"
+	"golang.zx2c4.com/wireguard/device"
 	"golang.zx2c4.com/wireguard/tun"
 )
 
@@ -18,13 +21,18 @@ type tunDevice struct {
 	address      WGAddress
 	mtu          int
 	netInterface NetInterface
+	iceBind      *bind.ICEBind
+	uapi         net.Listener
+	close        chan struct{}
 }
 
-func newTunDevice(name string, address WGAddress, mtu int) *tunDevice {
+func newTunDevice(name string, address WGAddress, mtu int, transportNet transport.Net) *tunDevice {
 	return &tunDevice{
 		name:    name,
 		address: address,
 		mtu:     mtu,
+		iceBind: bind.NewICEBind(transportNet),
+		close:   make(chan struct{}),
 	}
 }
 
@@ -42,23 +50,38 @@ func (c *tunDevice) DeviceName() string {
 }
 
 func (c *tunDevice) Close() error {
-	if c.netInterface == nil {
+
-		return nil
+	select {
+	case c.close <- struct{}{}:
+	default:
 	}
-	err := c.netInterface.Close()
+
-	if err != nil {
+	var err1, err2, err3 error
-		return err
+	if c.netInterface != nil {
+		err1 = c.netInterface.Close()
+	}
+
+	if c.uapi != nil {
+		err2 = c.uapi.Close()
 	}
 
 	sockPath := "/var/run/wireguard/" + c.name + ".sock"
 	if _, statErr := os.Stat(sockPath); statErr == nil {
 		statErr = os.Remove(sockPath)
 		if statErr != nil {
-			return statErr
+			err3 = statErr
 		}
 	}
 
-	return nil
+	if err1 != nil {
+		return err1
+	}
+
+	if err2 != nil {
+		return err2
+	}
+
+	return err3
 }
 
 // createWithUserspace Creates a new Wireguard interface, using wireguard-go userspace implementation
@@ -69,26 +92,36 @@ func (c *tunDevice) createWithUserspace() (NetInterface, error) {
 	}
 
 	// We need to create a wireguard-go device and listen to configuration requests
-	tunDevice := device.NewDevice(tunIface, conn.NewDefaultBind(), device.NewLogger(device.LogLevelSilent, "[wiretrustee] "))
+	tunDev := device.NewDevice(tunIface, c.iceBind, device.NewLogger(device.LogLevelSilent, "[netbird] "))
-	err = tunDevice.Up()
+	err = tunDev.Up()
 	if err != nil {
-		return tunIface, err
+		_ = tunIface.Close()
+		return nil, err
 	}
 
-	// todo: after this line in case of error close the tunSock
+	c.uapi, err = c.getUAPI(c.name)
-	uapi, err := c.getUAPI(c.name)
 	if err != nil {
-		return tunIface, err
+		_ = tunIface.Close()
+		return nil, err
 	}
 
 	go func() {
 		for {
-			uapiConn, uapiErr := uapi.Accept()
+			select {
+			case <-c.close:
+				log.Debugf("exit uapi.Accept()")
+				return
+			default:
+			}
+			uapiConn, uapiErr := c.uapi.Accept()
 			if uapiErr != nil {
 				log.Traceln("uapi Accept failed with error: ", uapiErr)
 				continue
 			}
-			go tunDevice.IpcHandle(uapiConn)
+			go func() {
+				tunDev.IpcHandle(uapiConn)
+				log.Debugf("exit tunDevice.IpcHandle")
+			}()
 		}
 	}()
 

iface/tun_windows.go

@@ -4,24 +4,39 @@ import (
 	"fmt"
 	"net"
 
+	"github.com/pion/transport/v2"
 	log "github.com/sirupsen/logrus"
-	"golang.org/x/sys/windows"
+	"golang.zx2c4.com/wireguard/device"
-	"golang.zx2c4.com/wireguard/windows/driver"
+	"golang.zx2c4.com/wireguard/ipc"
+	"golang.zx2c4.com/wireguard/tun"
+	"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
+
+	"github.com/netbirdio/netbird/iface/bind"
 )
 
 type tunDevice struct {
 	name         string
 	address      WGAddress
 	netInterface NetInterface
+	iceBind      *bind.ICEBind
+	mtu          int
+	uapi         net.Listener
+	close        chan struct{}
 }
 
-func newTunDevice(name string, address WGAddress, mtu int) *tunDevice {
+func newTunDevice(name string, address WGAddress, mtu int, transportNet transport.Net) *tunDevice {
-	return &tunDevice{name: name, address: address}
+	return &tunDevice{
+		name:    name,
+		address: address,
+		mtu:     mtu,
+		iceBind: bind.NewICEBind(transportNet),
+		close:   make(chan struct{}),
+	}
 }
 
 func (c *tunDevice) Create() error {
 	var err error
-	c.netInterface, err = c.createAdapter()
+	c.netInterface, err = c.createWithUserspace()
 	if err != nil {
 		return err
 	}
@@ -29,6 +44,51 @@ func (c *tunDevice) Create() error {
 	return c.assignAddr()
 }
 
+// createWithUserspace Creates a new Wireguard interface, using wireguard-go userspace implementation
+func (c *tunDevice) createWithUserspace() (NetInterface, error) {
+	tunIface, err := tun.CreateTUN(c.name, c.mtu)
+	if err != nil {
+		return nil, err
+	}
+
+	// We need to create a wireguard-go device and listen to configuration requests
+	tunDev := device.NewDevice(tunIface, c.iceBind, device.NewLogger(device.LogLevelSilent, "[netbird] "))
+	err = tunDev.Up()
+	if err != nil {
+		_ = tunIface.Close()
+		return nil, err
+	}
+
+	c.uapi, err = c.getUAPI(c.name)
+	if err != nil {
+		_ = tunIface.Close()
+		return nil, err
+	}
+
+	go func() {
+		for {
+			select {
+			case <-c.close:
+				log.Debugf("exit uapi.Accept()")
+				return
+			default:
+			}
+			uapiConn, uapiErr := c.uapi.Accept()
+			if uapiErr != nil {
+				log.Traceln("uapi Accept failed with error: ", uapiErr)
+				continue
+			}
+			go func() {
+				tunDev.IpcHandle(uapiConn)
+				log.Debugf("exit tunDevice.IpcHandle")
+			}()
+		}
+	}()
+
+	log.Debugln("UAPI listener started")
+	return tunIface, nil
+}
+
 func (c *tunDevice) UpdateAddr(address WGAddress) error {
 	c.address = address
 	return c.assignAddr()
@@ -43,19 +103,33 @@ func (c *tunDevice) DeviceName() string {
 }
 
 func (c *tunDevice) Close() error {
-	if c.netInterface == nil {
+	select {
-		return nil
+	case c.close <- struct{}{}:
+	default:
 	}
 
-	return c.netInterface.Close()
+	var err1, err2 error
+	if c.netInterface != nil {
+		err1 = c.netInterface.Close()
+	}
+
+	if c.uapi != nil {
+		err2 = c.uapi.Close()
+	}
+
+	if err1 != nil {
+		return err1
+	}
+
+	return err2
 }
 
 func (c *tunDevice) getInterfaceGUIDString() (string, error) {
 	if c.netInterface == nil {
 		return "", fmt.Errorf("interface has not been initialized yet")
 	}
-	windowsDevice := c.netInterface.(*driver.Adapter)
+	windowsDevice := c.netInterface.(*tun.NativeTun)
-	luid := windowsDevice.LUID()
+	luid := winipcfg.LUID(windowsDevice.LUID())
 	guid, err := luid.GUID()
 	if err != nil {
 		return "", err
@@ -63,31 +137,15 @@ func (c *tunDevice) getInterfaceGUIDString() (string, error) {
 	return guid.String(), nil
 }
 
-func (c *tunDevice) createAdapter() (NetInterface, error) {
-	WintunStaticRequestedGUID, _ := windows.GenerateGUID()
-	adapter, err := driver.CreateAdapter(c.name, "WireGuard", &WintunStaticRequestedGUID)
-	if err != nil {
-		err = fmt.Errorf("error creating adapter: %w", err)
-		return nil, err
-	}
-	err = adapter.SetAdapterState(driver.AdapterStateUp)
-	if err != nil {
-		return adapter, err
-	}
-	state, _ := adapter.LUID().GUID()
-	log.Debugln("device guid: ", state.String())
-	return adapter, nil
-}
-
 // assignAddr Adds IP address to the tunnel interface and network route based on the range provided
 func (c *tunDevice) assignAddr() error {
-	luid := c.netInterface.(*driver.Adapter).LUID()
+	tunDev := c.netInterface.(*tun.NativeTun)
-
+	luid := winipcfg.LUID(tunDev.LUID())
 	log.Debugf("adding address %s to interface: %s", c.address.IP, c.name)
-	err := luid.SetIPAddresses([]net.IPNet{{c.address.IP, c.address.Network.Mask}})
+	return luid.SetIPAddresses([]net.IPNet{{c.address.IP, c.address.Network.Mask}})
-	if err != nil {
+}
-		return err
+
-	}
+// getUAPI returns a Listener
-
+func (c *tunDevice) getUAPI(iface string) (net.Listener, error) {
-	return nil
+	return ipc.UAPIListen(iface)
 }