[client] Add experimental support for userspace routing (#3134)

client/Dockerfile-rootless

@@ -9,6 +9,7 @@ USER netbird:netbird
 
 ENV NB_FOREGROUND_MODE=true
 ENV NB_USE_NETSTACK_MODE=true
+ENV NB_ENABLE_NETSTACK_LOCAL_FORWARDING=true
 ENV NB_CONFIG=config.json
 ENV NB_DAEMON_ADDR=unix://netbird.sock
 ENV NB_DISABLE_DNS=true

client/cmd/trace.go

@@ -0,0 +1,137 @@
+package cmd
+
+import (
+	"fmt"
+	"math/rand"
+	"strings"
+
+	"github.com/spf13/cobra"
+	"google.golang.org/grpc/status"
+
+	"github.com/netbirdio/netbird/client/proto"
+)
+
+var traceCmd = &cobra.Command{
+	Use:   "trace <direction> <source-ip> <dest-ip>",
+	Short: "Trace a packet through the firewall",
+	Example: `
+  netbird debug trace in 192.168.1.10 10.10.0.2 -p tcp --sport 12345 --dport 443 --syn --ack
+  netbird debug trace out 10.10.0.1 8.8.8.8 -p udp  --dport 53
+  netbird debug trace in 10.10.0.2 10.10.0.1 -p icmp --type 8 --code 0
+  netbird debug trace in 100.64.1.1 self -p tcp --dport 80`,
+	Args: cobra.ExactArgs(3),
+	RunE: tracePacket,
+}
+
+func init() {
+	debugCmd.AddCommand(traceCmd)
+
+	traceCmd.Flags().StringP("protocol", "p", "tcp", "Protocol (tcp/udp/icmp)")
+	traceCmd.Flags().Uint16("sport", 0, "Source port")
+	traceCmd.Flags().Uint16("dport", 0, "Destination port")
+	traceCmd.Flags().Uint8("icmp-type", 0, "ICMP type")
+	traceCmd.Flags().Uint8("icmp-code", 0, "ICMP code")
+	traceCmd.Flags().Bool("syn", false, "TCP SYN flag")
+	traceCmd.Flags().Bool("ack", false, "TCP ACK flag")
+	traceCmd.Flags().Bool("fin", false, "TCP FIN flag")
+	traceCmd.Flags().Bool("rst", false, "TCP RST flag")
+	traceCmd.Flags().Bool("psh", false, "TCP PSH flag")
+	traceCmd.Flags().Bool("urg", false, "TCP URG flag")
+}
+
+func tracePacket(cmd *cobra.Command, args []string) error {
+	direction := strings.ToLower(args[0])
+	if direction != "in" && direction != "out" {
+		return fmt.Errorf("invalid direction: use 'in' or 'out'")
+	}
+
+	protocol := cmd.Flag("protocol").Value.String()
+	if protocol != "tcp" && protocol != "udp" && protocol != "icmp" {
+		return fmt.Errorf("invalid protocol: use tcp/udp/icmp")
+	}
+
+	sport, err := cmd.Flags().GetUint16("sport")
+	if err != nil {
+		return fmt.Errorf("invalid source port: %v", err)
+	}
+	dport, err := cmd.Flags().GetUint16("dport")
+	if err != nil {
+		return fmt.Errorf("invalid destination port: %v", err)
+	}
+
+	// For TCP/UDP, generate random ephemeral port (49152-65535) if not specified
+	if protocol != "icmp" {
+		if sport == 0 {
+			sport = uint16(rand.Intn(16383) + 49152)
+		}
+		if dport == 0 {
+			dport = uint16(rand.Intn(16383) + 49152)
+		}
+	}
+
+	var tcpFlags *proto.TCPFlags
+	if protocol == "tcp" {
+		syn, _ := cmd.Flags().GetBool("syn")
+		ack, _ := cmd.Flags().GetBool("ack")
+		fin, _ := cmd.Flags().GetBool("fin")
+		rst, _ := cmd.Flags().GetBool("rst")
+		psh, _ := cmd.Flags().GetBool("psh")
+		urg, _ := cmd.Flags().GetBool("urg")
+
+		tcpFlags = &proto.TCPFlags{
+			Syn: syn,
+			Ack: ack,
+			Fin: fin,
+			Rst: rst,
+			Psh: psh,
+			Urg: urg,
+		}
+	}
+
+	icmpType, _ := cmd.Flags().GetUint32("icmp-type")
+	icmpCode, _ := cmd.Flags().GetUint32("icmp-code")
+
+	conn, err := getClient(cmd)
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+
+	client := proto.NewDaemonServiceClient(conn)
+	resp, err := client.TracePacket(cmd.Context(), &proto.TracePacketRequest{
+		SourceIp:        args[1],
+		DestinationIp:   args[2],
+		Protocol:        protocol,
+		SourcePort:      uint32(sport),
+		DestinationPort: uint32(dport),
+		Direction:       direction,
+		TcpFlags:        tcpFlags,
+		IcmpType:        &icmpType,
+		IcmpCode:        &icmpCode,
+	})
+	if err != nil {
+		return fmt.Errorf("trace failed: %v", status.Convert(err).Message())
+	}
+
+	printTrace(cmd, args[1], args[2], protocol, sport, dport, resp)
+	return nil
+}
+
+func printTrace(cmd *cobra.Command, src, dst, proto string, sport, dport uint16, resp *proto.TracePacketResponse) {
+	cmd.Printf("Packet trace %s:%d -> %s:%d (%s)\n\n", src, sport, dst, dport, strings.ToUpper(proto))
+
+	for _, stage := range resp.Stages {
+		if stage.ForwardingDetails != nil {
+			cmd.Printf("%s: %s [%s]\n", stage.Name, stage.Message, *stage.ForwardingDetails)
+		} else {
+			cmd.Printf("%s: %s\n", stage.Name, stage.Message)
+		}
+	}
+
+	disposition := map[bool]string{
+		true:  "\033[32mALLOWED\033[0m", // Green
+		false: "\033[31mDENIED\033[0m",  // Red
+	}[resp.FinalDisposition]
+
+	cmd.Printf("\nFinal disposition: %s\n", disposition)
+}

client/firewall/create.go

@@ -14,13 +14,13 @@ import (
 )
 
 // NewFirewall creates a firewall manager instance
-func NewFirewall(iface IFaceMapper, _ *statemanager.Manager) (firewall.Manager, error) {
+func NewFirewall(iface IFaceMapper, _ *statemanager.Manager, disableServerRoutes bool) (firewall.Manager, error) {
 	if !iface.IsUserspaceBind() {
 		return nil, fmt.Errorf("not implemented for this OS: %s", runtime.GOOS)
 	}
 
 	// use userspace packet filtering firewall
-	fm, err := uspfilter.Create(iface)
+	fm, err := uspfilter.Create(iface, disableServerRoutes)
 	if err != nil {
 		return nil, err
 	}

client/firewall/create_linux.go

@@ -33,12 +33,12 @@ const SKIP_NFTABLES_ENV = "NB_SKIP_NFTABLES_CHECK"
 // FWType is the type for the firewall type
 type FWType int
 
-func NewFirewall(iface IFaceMapper, stateManager *statemanager.Manager) (firewall.Manager, error) {
+func NewFirewall(iface IFaceMapper, stateManager *statemanager.Manager, disableServerRoutes bool) (firewall.Manager, error) {
 	// on the linux system we try to user nftables or iptables
 	// in any case, because we need to allow netbird interface traffic
 	// so we use AllowNetbird traffic from these firewall managers
 	// for the userspace packet filtering firewall
-	fm, err := createNativeFirewall(iface, stateManager)
+	fm, err := createNativeFirewall(iface, stateManager, disableServerRoutes)
 
 	if !iface.IsUserspaceBind() {
 		return fm, err
@@ -47,10 +47,10 @@ func NewFirewall(iface IFaceMapper, stateManager *statemanager.Manager) (firewal
 	if err != nil {
 		log.Warnf("failed to create native firewall: %v. Proceeding with userspace", err)
 	}
-	return createUserspaceFirewall(iface, fm)
+	return createUserspaceFirewall(iface, fm, disableServerRoutes)
 }
 
-func createNativeFirewall(iface IFaceMapper, stateManager *statemanager.Manager) (firewall.Manager, error) {
+func createNativeFirewall(iface IFaceMapper, stateManager *statemanager.Manager, routes bool) (firewall.Manager, error) {
 	fm, err := createFW(iface)
 	if err != nil {
 		return nil, fmt.Errorf("create firewall: %s", err)
@@ -77,12 +77,12 @@ func createFW(iface IFaceMapper) (firewall.Manager, error) {
 	}
 }
 
-func createUserspaceFirewall(iface IFaceMapper, fm firewall.Manager) (firewall.Manager, error) {
+func createUserspaceFirewall(iface IFaceMapper, fm firewall.Manager, disableServerRoutes bool) (firewall.Manager, error) {
 	var errUsp error
 	if fm != nil {
-		fm, errUsp = uspfilter.CreateWithNativeFirewall(iface, fm)
+		fm, errUsp = uspfilter.CreateWithNativeFirewall(iface, fm, disableServerRoutes)
 	} else {
-		fm, errUsp = uspfilter.Create(iface)
+		fm, errUsp = uspfilter.Create(iface, disableServerRoutes)
 	}
 
 	if errUsp != nil {

client/firewall/iface.go

@@ -1,6 +1,8 @@
 package firewall
 
 import (
+	wgdevice "golang.zx2c4.com/wireguard/device"
+
 	"github.com/netbirdio/netbird/client/iface/device"
 )
 
@@ -10,4 +12,6 @@ type IFaceMapper interface {
 	Address() device.WGAddress
 	IsUserspaceBind() bool
 	SetFilter(device.PacketFilter) error
+	GetDevice() *device.FilteredDevice
+	GetWGDevice() *wgdevice.Device
 }

client/firewall/iptables/manager_linux.go

@@ -213,6 +213,11 @@ func (m *Manager) AllowNetbird() error {
 // Flush doesn't need to be implemented for this manager
 func (m *Manager) Flush() error { return nil }
 
+// SetLogLevel sets the log level for the firewall manager
+func (m *Manager) SetLogLevel(log.Level) {
+	// not supported
+}
+
 func getConntrackEstablished() []string {
 	return []string{"-m", "conntrack", "--ctstate", "RELATED,ESTABLISHED", "-j", "ACCEPT"}
 }

client/firewall/iptables/router_linux.go

@@ -135,7 +135,16 @@ func (r *router) AddRouteFiltering(
 	}
 
 	rule := genRouteFilteringRuleSpec(params)
-	if err := r.iptablesClient.Append(tableFilter, chainRTFWD, rule...); err != nil {
+	// Insert DROP rules at the beginning, append ACCEPT rules at the end
+	var err error
+	if action == firewall.ActionDrop {
+		// after the established rule
+		err = r.iptablesClient.Insert(tableFilter, chainRTFWD, 2, rule...)
+	} else {
+		err = r.iptablesClient.Append(tableFilter, chainRTFWD, rule...)
+	}
+
+	if err != nil {
 		return nil, fmt.Errorf("add route rule: %v", err)
 	}
 

client/firewall/manager/firewall.go

@@ -99,6 +99,8 @@ type Manager interface {
 
 	// Flush the changes to firewall controller
 	Flush() error
+
+	SetLogLevel(log.Level)
 }
 
 func GenKey(format string, pair RouterPair) string {

client/firewall/nftables/manager_linux.go

@@ -318,6 +318,11 @@ func (m *Manager) cleanupNetbirdTables() error {
 	return nil
 }
 
+// SetLogLevel sets the log level for the firewall manager
+func (m *Manager) SetLogLevel(log.Level) {
+	// not supported
+}
+
 // Flush rule/chain/set operations from the buffer
 //
 // Method also get all rules after flush and refreshes handle values in the rulesets

client/firewall/nftables/manager_linux_test.go

@@ -107,7 +107,7 @@ func TestNftablesManager(t *testing.T) {
 			Kind: expr.VerdictAccept,
 		},
 	}
-	require.ElementsMatch(t, rules[0].Exprs, expectedExprs1, "expected the same expressions")
+	compareExprsIgnoringCounters(t, rules[0].Exprs, expectedExprs1)
 
 	ipToAdd, _ := netip.AddrFromSlice(ip)
 	add := ipToAdd.Unmap()
@@ -307,3 +307,18 @@ func TestNftablesManagerCompatibilityWithIptables(t *testing.T) {
 	stdout, stderr = runIptablesSave(t)
 	verifyIptablesOutput(t, stdout, stderr)
 }
+
+func compareExprsIgnoringCounters(t *testing.T, got, want []expr.Any) {
+	t.Helper()
+	require.Equal(t, len(got), len(want), "expression count mismatch")
+
+	for i := range got {
+		if _, isCounter := got[i].(*expr.Counter); isCounter {
+			_, wantIsCounter := want[i].(*expr.Counter)
+			require.True(t, wantIsCounter, "expected Counter at index %d", i)
+			continue
+		}
+
+		require.Equal(t, got[i], want[i], "expression mismatch at index %d", i)
+	}
+}

client/firewall/nftables/router_linux.go

@@ -233,7 +233,13 @@ func (r *router) AddRouteFiltering(
 		UserData: []byte(ruleKey),
 	}
 
-	rule = r.conn.AddRule(rule)
+	// Insert DROP rules at the beginning, append ACCEPT rules at the end
+	if action == firewall.ActionDrop {
+		// TODO: Insert after the established rule
+		rule = r.conn.InsertRule(rule)
+	} else {
+		rule = r.conn.AddRule(rule)
+	}
 
 	log.Tracef("Adding route rule %s", spew.Sdump(rule))
 	if err := r.conn.Flush(); err != nil {

client/firewall/uspfilter/allow_netbird.go

@@ -3,6 +3,11 @@
 package uspfilter
 
 import (
+	"context"
+	"time"
+
+	log "github.com/sirupsen/logrus"
+
 	"github.com/netbirdio/netbird/client/firewall/uspfilter/conntrack"
 	"github.com/netbirdio/netbird/client/internal/statemanager"
 )
@@ -17,17 +22,29 @@ func (m *Manager) Reset(stateManager *statemanager.Manager) error {
 
 	if m.udpTracker != nil {
 		m.udpTracker.Close()
-		m.udpTracker = conntrack.NewUDPTracker(conntrack.DefaultUDPTimeout)
+		m.udpTracker = conntrack.NewUDPTracker(conntrack.DefaultUDPTimeout, m.logger)
 	}
 
 	if m.icmpTracker != nil {
 		m.icmpTracker.Close()
-		m.icmpTracker = conntrack.NewICMPTracker(conntrack.DefaultICMPTimeout)
+		m.icmpTracker = conntrack.NewICMPTracker(conntrack.DefaultICMPTimeout, m.logger)
 	}
 
 	if m.tcpTracker != nil {
 		m.tcpTracker.Close()
-		m.tcpTracker = conntrack.NewTCPTracker(conntrack.DefaultTCPTimeout)
+		m.tcpTracker = conntrack.NewTCPTracker(conntrack.DefaultTCPTimeout, m.logger)
+	}
+
+	if m.forwarder != nil {
+		m.forwarder.Stop()
+	}
+
+	if m.logger != nil {
+		ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+		defer cancel()
+		if err := m.logger.Stop(ctx); err != nil {
+			log.Errorf("failed to shutdown logger: %v", err)
+		}
 	}
 
 	if m.nativeFirewall != nil {

client/firewall/uspfilter/allow_netbird_windows.go

@@ -1,9 +1,11 @@
 package uspfilter
 
 import (
+	"context"
 	"fmt"
 	"os/exec"
 	"syscall"
+	"time"
 
 	log "github.com/sirupsen/logrus"
 
@@ -29,17 +31,29 @@ func (m *Manager) Reset(*statemanager.Manager) error {
 
 	if m.udpTracker != nil {
 		m.udpTracker.Close()
-		m.udpTracker = conntrack.NewUDPTracker(conntrack.DefaultUDPTimeout)
+		m.udpTracker = conntrack.NewUDPTracker(conntrack.DefaultUDPTimeout, m.logger)
 	}
 
 	if m.icmpTracker != nil {
 		m.icmpTracker.Close()
-		m.icmpTracker = conntrack.NewICMPTracker(conntrack.DefaultICMPTimeout)
+		m.icmpTracker = conntrack.NewICMPTracker(conntrack.DefaultICMPTimeout, m.logger)
 	}
 
 	if m.tcpTracker != nil {
 		m.tcpTracker.Close()
-		m.tcpTracker = conntrack.NewTCPTracker(conntrack.DefaultTCPTimeout)
+		m.tcpTracker = conntrack.NewTCPTracker(conntrack.DefaultTCPTimeout, m.logger)
+	}
+
+	if m.forwarder != nil {
+		m.forwarder.Stop()
+	}
+
+	if m.logger != nil {
+		ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+		defer cancel()
+		if err := m.logger.Stop(ctx); err != nil {
+			log.Errorf("failed to shutdown logger: %v", err)
+		}
 	}
 
 	if !isWindowsFirewallReachable() {

client/firewall/uspfilter/common/iface.go

@@ -0,0 +1,16 @@
+package common
+
+import (
+	wgdevice "golang.zx2c4.com/wireguard/device"
+
+	"github.com/netbirdio/netbird/client/iface"
+	"github.com/netbirdio/netbird/client/iface/device"
+)
+
+// IFaceMapper defines subset methods of interface required for manager
+type IFaceMapper interface {
+	SetFilter(device.PacketFilter) error
+	Address() iface.WGAddress
+	GetWGDevice() *wgdevice.Device
+	GetDevice() *device.FilteredDevice
+}

client/firewall/uspfilter/conntrack/common.go

@@ -10,12 +10,11 @@ import (
 
 // BaseConnTrack provides common fields and locking for all connection types
 type BaseConnTrack struct {
-	SourceIP    net.IP
+	SourceIP   net.IP
-	DestIP      net.IP
+	DestIP     net.IP
-	SourcePort  uint16
+	SourcePort uint16
-	DestPort    uint16
+	DestPort   uint16
-	lastSeen    atomic.Int64 // Unix nano for atomic access
+	lastSeen   atomic.Int64 // Unix nano for atomic access
-	established atomic.Bool
 }
 
 // these small methods will be inlined by the compiler
@@ -25,16 +24,6 @@ func (b *BaseConnTrack) UpdateLastSeen() {
 	b.lastSeen.Store(time.Now().UnixNano())
 }
 
-// IsEstablished safely checks if connection is established
-func (b *BaseConnTrack) IsEstablished() bool {
-	return b.established.Load()
-}
-
-// SetEstablished safely sets the established state
-func (b *BaseConnTrack) SetEstablished(state bool) {
-	b.established.Store(state)
-}
-
 // GetLastSeen safely gets the last seen timestamp
 func (b *BaseConnTrack) GetLastSeen() time.Time {
 	return time.Unix(0, b.lastSeen.Load())

client/firewall/uspfilter/conntrack/common_test.go

@@ -3,8 +3,14 @@ package conntrack
 import (
 	"net"
 	"testing"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/client/firewall/uspfilter/log"
 )
 
+var logger = log.NewFromLogrus(logrus.StandardLogger())
+
 func BenchmarkIPOperations(b *testing.B) {
 	b.Run("MakeIPAddr", func(b *testing.B) {
 		ip := net.ParseIP("192.168.1.1")
@@ -34,37 +40,11 @@ func BenchmarkIPOperations(b *testing.B) {
 	})
 
 }
-func BenchmarkAtomicOperations(b *testing.B) {
-	conn := &BaseConnTrack{}
-	b.Run("UpdateLastSeen", func(b *testing.B) {
-		for i := 0; i < b.N; i++ {
-			conn.UpdateLastSeen()
-		}
-	})
-
-	b.Run("IsEstablished", func(b *testing.B) {
-		for i := 0; i < b.N; i++ {
-			_ = conn.IsEstablished()
-		}
-	})
-
-	b.Run("SetEstablished", func(b *testing.B) {
-		for i := 0; i < b.N; i++ {
-			conn.SetEstablished(i%2 == 0)
-		}
-	})
-
-	b.Run("GetLastSeen", func(b *testing.B) {
-		for i := 0; i < b.N; i++ {
-			_ = conn.GetLastSeen()
-		}
-	})
-}
 
 // Memory pressure tests
 func BenchmarkMemoryPressure(b *testing.B) {
 	b.Run("TCPHighLoad", func(b *testing.B) {
-		tracker := NewTCPTracker(DefaultTCPTimeout)
+		tracker := NewTCPTracker(DefaultTCPTimeout, logger)
 		defer tracker.Close()
 
 		// Generate different IPs
@@ -89,7 +69,7 @@ func BenchmarkMemoryPressure(b *testing.B) {
 	})
 
 	b.Run("UDPHighLoad", func(b *testing.B) {
-		tracker := NewUDPTracker(DefaultUDPTimeout)
+		tracker := NewUDPTracker(DefaultUDPTimeout, logger)
 		defer tracker.Close()
 
 		// Generate different IPs

client/firewall/uspfilter/conntrack/icmp.go

@@ -6,6 +6,8 @@ import (
 	"time"
 
 	"github.com/google/gopacket/layers"
+
+	nblog "github.com/netbirdio/netbird/client/firewall/uspfilter/log"
 )
 
 const (
@@ -33,6 +35,7 @@ type ICMPConnTrack struct {
 
 // ICMPTracker manages ICMP connection states
 type ICMPTracker struct {
+	logger        *nblog.Logger
 	connections   map[ICMPConnKey]*ICMPConnTrack
 	timeout       time.Duration
 	cleanupTicker *time.Ticker
@@ -42,12 +45,13 @@ type ICMPTracker struct {
 }
 
 // NewICMPTracker creates a new ICMP connection tracker
-func NewICMPTracker(timeout time.Duration) *ICMPTracker {
+func NewICMPTracker(timeout time.Duration, logger *nblog.Logger) *ICMPTracker {
 	if timeout == 0 {
 		timeout = DefaultICMPTimeout
 	}
 
 	tracker := &ICMPTracker{
+		logger:        logger,
 		connections:   make(map[ICMPConnKey]*ICMPConnTrack),
 		timeout:       timeout,
 		cleanupTicker: time.NewTicker(ICMPCleanupInterval),
@@ -62,7 +66,6 @@ func NewICMPTracker(timeout time.Duration) *ICMPTracker {
 // TrackOutbound records an outbound ICMP Echo Request
 func (t *ICMPTracker) TrackOutbound(srcIP net.IP, dstIP net.IP, id uint16, seq uint16) {
 	key := makeICMPKey(srcIP, dstIP, id, seq)
-	now := time.Now().UnixNano()
 
 	t.mutex.Lock()
 	conn, exists := t.connections[key]
@@ -80,24 +83,19 @@ func (t *ICMPTracker) TrackOutbound(srcIP net.IP, dstIP net.IP, id uint16, seq u
 			ID:       id,
 			Sequence: seq,
 		}
-		conn.lastSeen.Store(now)
+		conn.UpdateLastSeen()
-		conn.established.Store(true)
 		t.connections[key] = conn
+
+		t.logger.Trace("New ICMP connection %v", key)
 	}
 	t.mutex.Unlock()
 
-	conn.lastSeen.Store(now)
+	conn.UpdateLastSeen()
 }
 
 // IsValidInbound checks if an inbound ICMP Echo Reply matches a tracked request
 func (t *ICMPTracker) IsValidInbound(srcIP net.IP, dstIP net.IP, id uint16, seq uint16, icmpType uint8) bool {
-	switch icmpType {
+	if icmpType != uint8(layers.ICMPv4TypeEchoReply) {
-	case uint8(layers.ICMPv4TypeDestinationUnreachable),
-		uint8(layers.ICMPv4TypeTimeExceeded):
-		return true
-	case uint8(layers.ICMPv4TypeEchoReply):
-		// continue processing
-	default:
 		return false
 	}
 
@@ -115,8 +113,7 @@ func (t *ICMPTracker) IsValidInbound(srcIP net.IP, dstIP net.IP, id uint16, seq
 		return false
 	}
 
-	return conn.IsEstablished() &&
+	return ValidateIPs(MakeIPAddr(srcIP), conn.DestIP) &&
-		ValidateIPs(MakeIPAddr(srcIP), conn.DestIP) &&
 		ValidateIPs(MakeIPAddr(dstIP), conn.SourceIP) &&
 		conn.ID == id &&
 		conn.Sequence == seq
@@ -141,6 +138,8 @@ func (t *ICMPTracker) cleanup() {
 			t.ipPool.Put(conn.SourceIP)
 			t.ipPool.Put(conn.DestIP)
 			delete(t.connections, key)
+
+			t.logger.Debug("Removed ICMP connection %v (timeout)", key)
 		}
 	}
 }

client/firewall/uspfilter/conntrack/icmp_test.go

@@ -7,7 +7,7 @@ import (
 
 func BenchmarkICMPTracker(b *testing.B) {
 	b.Run("TrackOutbound", func(b *testing.B) {
-		tracker := NewICMPTracker(DefaultICMPTimeout)
+		tracker := NewICMPTracker(DefaultICMPTimeout, logger)
 		defer tracker.Close()
 
 		srcIP := net.ParseIP("192.168.1.1")
@@ -20,7 +20,7 @@ func BenchmarkICMPTracker(b *testing.B) {
 	})
 
 	b.Run("IsValidInbound", func(b *testing.B) {
-		tracker := NewICMPTracker(DefaultICMPTimeout)
+		tracker := NewICMPTracker(DefaultICMPTimeout, logger)
 		defer tracker.Close()
 
 		srcIP := net.ParseIP("192.168.1.1")

client/firewall/uspfilter/conntrack/tcp.go

@@ -5,7 +5,10 @@ package conntrack
 import (
 	"net"
 	"sync"
+	"sync/atomic"
 	"time"
+
+	nblog "github.com/netbirdio/netbird/client/firewall/uspfilter/log"
 )
 
 const (
@@ -61,12 +64,24 @@ type TCPConnKey struct {
 // TCPConnTrack represents a TCP connection state
 type TCPConnTrack struct {
 	BaseConnTrack
-	State TCPState
+	State       TCPState
+	established atomic.Bool
 	sync.RWMutex
 }
 
+// IsEstablished safely checks if connection is established
+func (t *TCPConnTrack) IsEstablished() bool {
+	return t.established.Load()
+}
+
+// SetEstablished safely sets the established state
+func (t *TCPConnTrack) SetEstablished(state bool) {
+	t.established.Store(state)
+}
+
 // TCPTracker manages TCP connection states
 type TCPTracker struct {
+	logger        *nblog.Logger
 	connections   map[ConnKey]*TCPConnTrack
 	mutex         sync.RWMutex
 	cleanupTicker *time.Ticker
@@ -76,8 +91,9 @@ type TCPTracker struct {
 }
 
 // NewTCPTracker creates a new TCP connection tracker
-func NewTCPTracker(timeout time.Duration) *TCPTracker {
+func NewTCPTracker(timeout time.Duration, logger *nblog.Logger) *TCPTracker {
 	tracker := &TCPTracker{
+		logger:        logger,
 		connections:   make(map[ConnKey]*TCPConnTrack),
 		cleanupTicker: time.NewTicker(TCPCleanupInterval),
 		done:          make(chan struct{}),
@@ -93,7 +109,6 @@ func NewTCPTracker(timeout time.Duration) *TCPTracker {
 func (t *TCPTracker) TrackOutbound(srcIP net.IP, dstIP net.IP, srcPort uint16, dstPort uint16, flags uint8) {
 	// Create key before lock
 	key := makeConnKey(srcIP, dstIP, srcPort, dstPort)
-	now := time.Now().UnixNano()
 
 	t.mutex.Lock()
 	conn, exists := t.connections[key]
@@ -113,9 +128,11 @@ func (t *TCPTracker) TrackOutbound(srcIP net.IP, dstIP net.IP, srcPort uint16, d
 			},
 			State: TCPStateNew,
 		}
-		conn.lastSeen.Store(now)
+		conn.UpdateLastSeen()
 		conn.established.Store(false)
 		t.connections[key] = conn
+
+		t.logger.Trace("New TCP connection: %s:%d -> %s:%d", srcIP, srcPort, dstIP, dstPort)
 	}
 	t.mutex.Unlock()
 
@@ -123,7 +140,7 @@ func (t *TCPTracker) TrackOutbound(srcIP net.IP, dstIP net.IP, srcPort uint16, d
 	conn.Lock()
 	t.updateState(conn, flags, true)
 	conn.Unlock()
-	conn.lastSeen.Store(now)
+	conn.UpdateLastSeen()
 }
 
 // IsValidInbound checks if an inbound TCP packet matches a tracked connection
@@ -171,6 +188,9 @@ func (t *TCPTracker) updateState(conn *TCPConnTrack, flags uint8, isOutbound boo
 	if flags&TCPRst != 0 {
 		conn.State = TCPStateClosed
 		conn.SetEstablished(false)
+
+		t.logger.Trace("TCP connection reset: %s:%d -> %s:%d",
+			conn.SourceIP, conn.SourcePort, conn.DestIP, conn.DestPort)
 		return
 	}
 
@@ -227,6 +247,9 @@ func (t *TCPTracker) updateState(conn *TCPConnTrack, flags uint8, isOutbound boo
 		if flags&TCPAck != 0 {
 			conn.State = TCPStateTimeWait
 			// Keep established = false from previous state
+
+			t.logger.Trace("TCP connection closed (simultaneous) - %s:%d -> %s:%d",
+				conn.SourceIP, conn.SourcePort, conn.DestIP, conn.DestPort)
 		}
 
 	case TCPStateCloseWait:
@@ -237,11 +260,17 @@ func (t *TCPTracker) updateState(conn *TCPConnTrack, flags uint8, isOutbound boo
 	case TCPStateLastAck:
 		if flags&TCPAck != 0 {
 			conn.State = TCPStateClosed
+
+			t.logger.Trace("TCP connection gracefully closed: %s:%d -> %s:%d",
+				conn.SourceIP, conn.SourcePort, conn.DestIP, conn.DestPort)
 		}
 
 	case TCPStateTimeWait:
 		// Stay in TIME-WAIT for 2MSL before transitioning to closed
 		// This is handled by the cleanup routine
+
+		t.logger.Trace("TCP connection completed - %s:%d -> %s:%d",
+			conn.SourceIP, conn.SourcePort, conn.DestIP, conn.DestPort)
 	}
 }
 
@@ -318,6 +347,8 @@ func (t *TCPTracker) cleanup() {
 			t.ipPool.Put(conn.SourceIP)
 			t.ipPool.Put(conn.DestIP)
 			delete(t.connections, key)
+
+			t.logger.Trace("Cleaned up TCP connection: %s:%d -> %s:%d", conn.SourceIP, conn.SourcePort, conn.DestIP, conn.DestPort)
 		}
 	}
 }

client/firewall/uspfilter/conntrack/tcp_test.go

@@ -9,7 +9,7 @@ import (
 )
 
 func TestTCPStateMachine(t *testing.T) {
-	tracker := NewTCPTracker(DefaultTCPTimeout)
+	tracker := NewTCPTracker(DefaultTCPTimeout, logger)
 	defer tracker.Close()
 
 	srcIP := net.ParseIP("100.64.0.1")
@@ -154,7 +154,7 @@ func TestTCPStateMachine(t *testing.T) {
 			t.Run(tt.name, func(t *testing.T) {
 				t.Helper()
 
-				tracker = NewTCPTracker(DefaultTCPTimeout)
+				tracker = NewTCPTracker(DefaultTCPTimeout, logger)
 				tt.test(t)
 			})
 		}
@@ -162,7 +162,7 @@ func TestTCPStateMachine(t *testing.T) {
 }
 
 func TestRSTHandling(t *testing.T) {
-	tracker := NewTCPTracker(DefaultTCPTimeout)
+	tracker := NewTCPTracker(DefaultTCPTimeout, logger)
 	defer tracker.Close()
 
 	srcIP := net.ParseIP("100.64.0.1")
@@ -233,7 +233,7 @@ func establishConnection(t *testing.T, tracker *TCPTracker, srcIP, dstIP net.IP,
 
 func BenchmarkTCPTracker(b *testing.B) {
 	b.Run("TrackOutbound", func(b *testing.B) {
-		tracker := NewTCPTracker(DefaultTCPTimeout)
+		tracker := NewTCPTracker(DefaultTCPTimeout, logger)
 		defer tracker.Close()
 
 		srcIP := net.ParseIP("192.168.1.1")
@@ -246,7 +246,7 @@ func BenchmarkTCPTracker(b *testing.B) {
 	})
 
 	b.Run("IsValidInbound", func(b *testing.B) {
-		tracker := NewTCPTracker(DefaultTCPTimeout)
+		tracker := NewTCPTracker(DefaultTCPTimeout, logger)
 		defer tracker.Close()
 
 		srcIP := net.ParseIP("192.168.1.1")
@@ -264,7 +264,7 @@ func BenchmarkTCPTracker(b *testing.B) {
 	})
 
 	b.Run("ConcurrentAccess", func(b *testing.B) {
-		tracker := NewTCPTracker(DefaultTCPTimeout)
+		tracker := NewTCPTracker(DefaultTCPTimeout, logger)
 		defer tracker.Close()
 
 		srcIP := net.ParseIP("192.168.1.1")
@@ -287,7 +287,7 @@ func BenchmarkTCPTracker(b *testing.B) {
 // Benchmark connection cleanup
 func BenchmarkCleanup(b *testing.B) {
 	b.Run("TCPCleanup", func(b *testing.B) {
-		tracker := NewTCPTracker(100 * time.Millisecond) // Short timeout for testing
+		tracker := NewTCPTracker(100*time.Millisecond, logger) // Short timeout for testing
 		defer tracker.Close()
 
 		// Pre-populate with expired connections

client/firewall/uspfilter/conntrack/udp.go

@@ -4,6 +4,8 @@ import (
 	"net"
 	"sync"
 	"time"
+
+	nblog "github.com/netbirdio/netbird/client/firewall/uspfilter/log"
 )
 
 const (
@@ -20,6 +22,7 @@ type UDPConnTrack struct {
 
 // UDPTracker manages UDP connection states
 type UDPTracker struct {
+	logger        *nblog.Logger
 	connections   map[ConnKey]*UDPConnTrack
 	timeout       time.Duration
 	cleanupTicker *time.Ticker
@@ -29,12 +32,13 @@ type UDPTracker struct {
 }
 
 // NewUDPTracker creates a new UDP connection tracker
-func NewUDPTracker(timeout time.Duration) *UDPTracker {
+func NewUDPTracker(timeout time.Duration, logger *nblog.Logger) *UDPTracker {
 	if timeout == 0 {
 		timeout = DefaultUDPTimeout
 	}
 
 	tracker := &UDPTracker{
+		logger:        logger,
 		connections:   make(map[ConnKey]*UDPConnTrack),
 		timeout:       timeout,
 		cleanupTicker: time.NewTicker(UDPCleanupInterval),
@@ -49,7 +53,6 @@ func NewUDPTracker(timeout time.Duration) *UDPTracker {
 // TrackOutbound records an outbound UDP connection
 func (t *UDPTracker) TrackOutbound(srcIP net.IP, dstIP net.IP, srcPort uint16, dstPort uint16) {
 	key := makeConnKey(srcIP, dstIP, srcPort, dstPort)
-	now := time.Now().UnixNano()
 
 	t.mutex.Lock()
 	conn, exists := t.connections[key]
@@ -67,13 +70,14 @@ func (t *UDPTracker) TrackOutbound(srcIP net.IP, dstIP net.IP, srcPort uint16, d
 				DestPort:   dstPort,
 			},
 		}
-		conn.lastSeen.Store(now)
+		conn.UpdateLastSeen()
-		conn.established.Store(true)
 		t.connections[key] = conn
+
+		t.logger.Trace("New UDP connection: %v", conn)
 	}
 	t.mutex.Unlock()
 
-	conn.lastSeen.Store(now)
+	conn.UpdateLastSeen()
 }
 
 // IsValidInbound checks if an inbound packet matches a tracked connection
@@ -92,8 +96,7 @@ func (t *UDPTracker) IsValidInbound(srcIP net.IP, dstIP net.IP, srcPort uint16,
 		return false
 	}
 
-	return conn.IsEstablished() &&
+	return ValidateIPs(MakeIPAddr(srcIP), conn.DestIP) &&
-		ValidateIPs(MakeIPAddr(srcIP), conn.DestIP) &&
 		ValidateIPs(MakeIPAddr(dstIP), conn.SourceIP) &&
 		conn.DestPort == srcPort &&
 		conn.SourcePort == dstPort
@@ -120,6 +123,8 @@ func (t *UDPTracker) cleanup() {
 			t.ipPool.Put(conn.SourceIP)
 			t.ipPool.Put(conn.DestIP)
 			delete(t.connections, key)
+
+			t.logger.Trace("Removed UDP connection %v (timeout)", conn)
 		}
 	}
 }

client/firewall/uspfilter/conntrack/udp_test.go

@@ -29,7 +29,7 @@ func TestNewUDPTracker(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			tracker := NewUDPTracker(tt.timeout)
+			tracker := NewUDPTracker(tt.timeout, logger)
 			assert.NotNil(t, tracker)
 			assert.Equal(t, tt.wantTimeout, tracker.timeout)
 			assert.NotNil(t, tracker.connections)
@@ -40,7 +40,7 @@ func TestNewUDPTracker(t *testing.T) {
 }
 
 func TestUDPTracker_TrackOutbound(t *testing.T) {
-	tracker := NewUDPTracker(DefaultUDPTimeout)
+	tracker := NewUDPTracker(DefaultUDPTimeout, logger)
 	defer tracker.Close()
 
 	srcIP := net.ParseIP("192.168.1.2")
@@ -58,12 +58,11 @@ func TestUDPTracker_TrackOutbound(t *testing.T) {
 	assert.True(t, conn.DestIP.Equal(dstIP))
 	assert.Equal(t, srcPort, conn.SourcePort)
 	assert.Equal(t, dstPort, conn.DestPort)
-	assert.True(t, conn.IsEstablished())
 	assert.WithinDuration(t, time.Now(), conn.GetLastSeen(), 1*time.Second)
 }
 
 func TestUDPTracker_IsValidInbound(t *testing.T) {
-	tracker := NewUDPTracker(1 * time.Second)
+	tracker := NewUDPTracker(1*time.Second, logger)
 	defer tracker.Close()
 
 	srcIP := net.ParseIP("192.168.1.2")
@@ -162,6 +161,7 @@ func TestUDPTracker_Cleanup(t *testing.T) {
 		cleanupTicker: time.NewTicker(cleanupInterval),
 		done:          make(chan struct{}),
 		ipPool:        NewPreallocatedIPs(),
+		logger:        logger,
 	}
 
 	// Start cleanup routine
@@ -211,7 +211,7 @@ func TestUDPTracker_Cleanup(t *testing.T) {
 
 func BenchmarkUDPTracker(b *testing.B) {
 	b.Run("TrackOutbound", func(b *testing.B) {
-		tracker := NewUDPTracker(DefaultUDPTimeout)
+		tracker := NewUDPTracker(DefaultUDPTimeout, logger)
 		defer tracker.Close()
 
 		srcIP := net.ParseIP("192.168.1.1")
@@ -224,7 +224,7 @@ func BenchmarkUDPTracker(b *testing.B) {
 	})
 
 	b.Run("IsValidInbound", func(b *testing.B) {
-		tracker := NewUDPTracker(DefaultUDPTimeout)
+		tracker := NewUDPTracker(DefaultUDPTimeout, logger)
 		defer tracker.Close()
 
 		srcIP := net.ParseIP("192.168.1.1")

client/firewall/uspfilter/forwarder/endpoint.go

@@ -0,0 +1,81 @@
+package forwarder
+
+import (
+	wgdevice "golang.zx2c4.com/wireguard/device"
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/header"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+
+	nblog "github.com/netbirdio/netbird/client/firewall/uspfilter/log"
+)
+
+// endpoint implements stack.LinkEndpoint and handles integration with the wireguard device
+type endpoint struct {
+	logger     *nblog.Logger
+	dispatcher stack.NetworkDispatcher
+	device     *wgdevice.Device
+	mtu        uint32
+}
+
+func (e *endpoint) Attach(dispatcher stack.NetworkDispatcher) {
+	e.dispatcher = dispatcher
+}
+
+func (e *endpoint) IsAttached() bool {
+	return e.dispatcher != nil
+}
+
+func (e *endpoint) MTU() uint32 {
+	return e.mtu
+}
+
+func (e *endpoint) Capabilities() stack.LinkEndpointCapabilities {
+	return stack.CapabilityNone
+}
+
+func (e *endpoint) MaxHeaderLength() uint16 {
+	return 0
+}
+
+func (e *endpoint) LinkAddress() tcpip.LinkAddress {
+	return ""
+}
+
+func (e *endpoint) WritePackets(pkts stack.PacketBufferList) (int, tcpip.Error) {
+	var written int
+	for _, pkt := range pkts.AsSlice() {
+		netHeader := header.IPv4(pkt.NetworkHeader().View().AsSlice())
+
+		data := stack.PayloadSince(pkt.NetworkHeader())
+		if data == nil {
+			continue
+		}
+
+		// Send the packet through WireGuard
+		address := netHeader.DestinationAddress()
+		err := e.device.CreateOutboundPacket(data.AsSlice(), address.AsSlice())
+		if err != nil {
+			e.logger.Error("CreateOutboundPacket: %v", err)
+			continue
+		}
+		written++
+	}
+
+	return written, nil
+}
+
+func (e *endpoint) Wait() {
+	// not required
+}
+
+func (e *endpoint) ARPHardwareType() header.ARPHardwareType {
+	return header.ARPHardwareNone
+}
+
+func (e *endpoint) AddHeader(*stack.PacketBuffer) {
+	// not required
+}
+
+func (e *endpoint) ParseHeader(*stack.PacketBuffer) bool {
+	return true
+}

client/firewall/uspfilter/forwarder/forwarder.go

@@ -0,0 +1,166 @@
+package forwarder
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"runtime"
+
+	log "github.com/sirupsen/logrus"
+	"gvisor.dev/gvisor/pkg/buffer"
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/header"
+	"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+	"gvisor.dev/gvisor/pkg/tcpip/transport/icmp"
+	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
+	"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
+
+	"github.com/netbirdio/netbird/client/firewall/uspfilter/common"
+	nblog "github.com/netbirdio/netbird/client/firewall/uspfilter/log"
+)
+
+const (
+	defaultReceiveWindow = 32768
+	defaultMaxInFlight   = 1024
+	iosReceiveWindow     = 16384
+	iosMaxInFlight       = 256
+)
+
+type Forwarder struct {
+	logger       *nblog.Logger
+	stack        *stack.Stack
+	endpoint     *endpoint
+	udpForwarder *udpForwarder
+	ctx          context.Context
+	cancel       context.CancelFunc
+	ip           net.IP
+	netstack     bool
+}
+
+func New(iface common.IFaceMapper, logger *nblog.Logger, netstack bool) (*Forwarder, error) {
+	s := stack.New(stack.Options{
+		NetworkProtocols: []stack.NetworkProtocolFactory{ipv4.NewProtocol},
+		TransportProtocols: []stack.TransportProtocolFactory{
+			tcp.NewProtocol,
+			udp.NewProtocol,
+			icmp.NewProtocol4,
+		},
+		HandleLocal: false,
+	})
+
+	mtu, err := iface.GetDevice().MTU()
+	if err != nil {
+		return nil, fmt.Errorf("get MTU: %w", err)
+	}
+	nicID := tcpip.NICID(1)
+	endpoint := &endpoint{
+		logger: logger,
+		device: iface.GetWGDevice(),
+		mtu:    uint32(mtu),
+	}
+
+	if err := s.CreateNIC(nicID, endpoint); err != nil {
+		return nil, fmt.Errorf("failed to create NIC: %v", err)
+	}
+
+	ones, _ := iface.Address().Network.Mask.Size()
+	protoAddr := tcpip.ProtocolAddress{
+		Protocol: ipv4.ProtocolNumber,
+		AddressWithPrefix: tcpip.AddressWithPrefix{
+			Address:   tcpip.AddrFromSlice(iface.Address().IP.To4()),
+			PrefixLen: ones,
+		},
+	}
+
+	if err := s.AddProtocolAddress(nicID, protoAddr, stack.AddressProperties{}); err != nil {
+		return nil, fmt.Errorf("failed to add protocol address: %s", err)
+	}
+
+	defaultSubnet, err := tcpip.NewSubnet(
+		tcpip.AddrFrom4([4]byte{0, 0, 0, 0}),
+		tcpip.MaskFromBytes([]byte{0, 0, 0, 0}),
+	)
+	if err != nil {
+		return nil, fmt.Errorf("creating default subnet: %w", err)
+	}
+
+	if err := s.SetPromiscuousMode(nicID, true); err != nil {
+		return nil, fmt.Errorf("set promiscuous mode: %s", err)
+	}
+	if err := s.SetSpoofing(nicID, true); err != nil {
+		return nil, fmt.Errorf("set spoofing: %s", err)
+	}
+
+	s.SetRouteTable([]tcpip.Route{
+		{
+			Destination: defaultSubnet,
+			NIC:         nicID,
+		},
+	})
+
+	ctx, cancel := context.WithCancel(context.Background())
+	f := &Forwarder{
+		logger:       logger,
+		stack:        s,
+		endpoint:     endpoint,
+		udpForwarder: newUDPForwarder(mtu, logger),
+		ctx:          ctx,
+		cancel:       cancel,
+		netstack:     netstack,
+		ip:           iface.Address().IP,
+	}
+
+	receiveWindow := defaultReceiveWindow
+	maxInFlight := defaultMaxInFlight
+	if runtime.GOOS == "ios" {
+		receiveWindow = iosReceiveWindow
+		maxInFlight = iosMaxInFlight
+	}
+
+	tcpForwarder := tcp.NewForwarder(s, receiveWindow, maxInFlight, f.handleTCP)
+	s.SetTransportProtocolHandler(tcp.ProtocolNumber, tcpForwarder.HandlePacket)
+
+	udpForwarder := udp.NewForwarder(s, f.handleUDP)
+	s.SetTransportProtocolHandler(udp.ProtocolNumber, udpForwarder.HandlePacket)
+
+	s.SetTransportProtocolHandler(icmp.ProtocolNumber4, f.handleICMP)
+
+	log.Debugf("forwarder: Initialization complete with NIC %d", nicID)
+	return f, nil
+}
+
+func (f *Forwarder) InjectIncomingPacket(payload []byte) error {
+	if len(payload) < header.IPv4MinimumSize {
+		return fmt.Errorf("packet too small: %d bytes", len(payload))
+	}
+
+	pkt := stack.NewPacketBuffer(stack.PacketBufferOptions{
+		Payload: buffer.MakeWithData(payload),
+	})
+	defer pkt.DecRef()
+
+	if f.endpoint.dispatcher != nil {
+		f.endpoint.dispatcher.DeliverNetworkPacket(ipv4.ProtocolNumber, pkt)
+	}
+	return nil
+}
+
+// Stop gracefully shuts down the forwarder
+func (f *Forwarder) Stop() {
+	f.cancel()
+
+	if f.udpForwarder != nil {
+		f.udpForwarder.Stop()
+	}
+
+	f.stack.Close()
+	f.stack.Wait()
+}
+
+func (f *Forwarder) determineDialAddr(addr tcpip.Address) net.IP {
+	if f.netstack && f.ip.Equal(addr.AsSlice()) {
+		return net.IPv4(127, 0, 0, 1)
+	}
+	return addr.AsSlice()
+}

client/firewall/uspfilter/forwarder/icmp.go

@@ -0,0 +1,109 @@
+package forwarder
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"gvisor.dev/gvisor/pkg/tcpip/header"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+)
+
+// handleICMP handles ICMP packets from the network stack
+func (f *Forwarder) handleICMP(id stack.TransportEndpointID, pkt stack.PacketBufferPtr) bool {
+	ctx, cancel := context.WithTimeout(f.ctx, 5*time.Second)
+	defer cancel()
+
+	lc := net.ListenConfig{}
+	// TODO: support non-root
+	conn, err := lc.ListenPacket(ctx, "ip4:icmp", "0.0.0.0")
+	if err != nil {
+		f.logger.Error("Failed to create ICMP socket for %v: %v", id, err)
+
+		// This will make netstack reply on behalf of the original destination, that's ok for now
+		return false
+	}
+	defer func() {
+		if err := conn.Close(); err != nil {
+			f.logger.Debug("Failed to close ICMP socket: %v", err)
+		}
+	}()
+
+	dstIP := f.determineDialAddr(id.LocalAddress)
+	dst := &net.IPAddr{IP: dstIP}
+
+	// Get the complete ICMP message (header + data)
+	fullPacket := stack.PayloadSince(pkt.TransportHeader())
+	payload := fullPacket.AsSlice()
+
+	icmpHdr := header.ICMPv4(pkt.TransportHeader().View().AsSlice())
+
+	// For Echo Requests, send and handle response
+	switch icmpHdr.Type() {
+	case header.ICMPv4Echo:
+		return f.handleEchoResponse(icmpHdr, payload, dst, conn, id)
+	case header.ICMPv4EchoReply:
+		// dont process our own replies
+		return true
+	default:
+	}
+
+	// For other ICMP types (Time Exceeded, Destination Unreachable, etc)
+	_, err = conn.WriteTo(payload, dst)
+	if err != nil {
+		f.logger.Error("Failed to write ICMP packet for %v: %v", id, err)
+		return true
+	}
+
+	f.logger.Trace("Forwarded ICMP packet %v type=%v code=%v",
+		id, icmpHdr.Type(), icmpHdr.Code())
+
+	return true
+}
+
+func (f *Forwarder) handleEchoResponse(icmpHdr header.ICMPv4, payload []byte, dst *net.IPAddr, conn net.PacketConn, id stack.TransportEndpointID) bool {
+	if _, err := conn.WriteTo(payload, dst); err != nil {
+		f.logger.Error("Failed to write ICMP packet for %v: %v", id, err)
+		return true
+	}
+
+	f.logger.Trace("Forwarded ICMP packet %v type=%v code=%v",
+		id, icmpHdr.Type(), icmpHdr.Code())
+
+	if err := conn.SetReadDeadline(time.Now().Add(5 * time.Second)); err != nil {
+		f.logger.Error("Failed to set read deadline for ICMP response: %v", err)
+		return true
+	}
+
+	response := make([]byte, f.endpoint.mtu)
+	n, _, err := conn.ReadFrom(response)
+	if err != nil {
+		if !isTimeout(err) {
+			f.logger.Error("Failed to read ICMP response: %v", err)
+		}
+		return true
+	}
+
+	ipHdr := make([]byte, header.IPv4MinimumSize)
+	ip := header.IPv4(ipHdr)
+	ip.Encode(&header.IPv4Fields{
+		TotalLength: uint16(header.IPv4MinimumSize + n),
+		TTL:         64,
+		Protocol:    uint8(header.ICMPv4ProtocolNumber),
+		SrcAddr:     id.LocalAddress,
+		DstAddr:     id.RemoteAddress,
+	})
+	ip.SetChecksum(^ip.CalculateChecksum())
+
+	fullPacket := make([]byte, 0, len(ipHdr)+n)
+	fullPacket = append(fullPacket, ipHdr...)
+	fullPacket = append(fullPacket, response[:n]...)
+
+	if err := f.InjectIncomingPacket(fullPacket); err != nil {
+		f.logger.Error("Failed to inject ICMP response: %v", err)
+		return true
+	}
+
+	f.logger.Trace("Forwarded ICMP echo reply for %v", id)
+	return true
+}

client/firewall/uspfilter/forwarder/tcp.go

@@ -0,0 +1,90 @@
+package forwarder
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net"
+
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
+	"gvisor.dev/gvisor/pkg/waiter"
+)
+
+// handleTCP is called by the TCP forwarder for new connections.
+func (f *Forwarder) handleTCP(r *tcp.ForwarderRequest) {
+	id := r.ID()
+
+	dialAddr := fmt.Sprintf("%s:%d", f.determineDialAddr(id.LocalAddress), id.LocalPort)
+
+	outConn, err := (&net.Dialer{}).DialContext(f.ctx, "tcp", dialAddr)
+	if err != nil {
+		r.Complete(true)
+		f.logger.Trace("forwarder: dial error for %v: %v", id, err)
+		return
+	}
+
+	// Create wait queue for blocking syscalls
+	wq := waiter.Queue{}
+
+	ep, epErr := r.CreateEndpoint(&wq)
+	if epErr != nil {
+		f.logger.Error("forwarder: failed to create TCP endpoint: %v", epErr)
+		if err := outConn.Close(); err != nil {
+			f.logger.Debug("forwarder: outConn close error: %v", err)
+		}
+		r.Complete(true)
+		return
+	}
+
+	// Complete the handshake
+	r.Complete(false)
+
+	inConn := gonet.NewTCPConn(&wq, ep)
+
+	f.logger.Trace("forwarder: established TCP connection %v", id)
+
+	go f.proxyTCP(id, inConn, outConn, ep)
+}
+
+func (f *Forwarder) proxyTCP(id stack.TransportEndpointID, inConn *gonet.TCPConn, outConn net.Conn, ep tcpip.Endpoint) {
+	defer func() {
+		if err := inConn.Close(); err != nil {
+			f.logger.Debug("forwarder: inConn close error: %v", err)
+		}
+		if err := outConn.Close(); err != nil {
+			f.logger.Debug("forwarder: outConn close error: %v", err)
+		}
+		ep.Close()
+	}()
+
+	// Create context for managing the proxy goroutines
+	ctx, cancel := context.WithCancel(f.ctx)
+	defer cancel()
+
+	errChan := make(chan error, 2)
+
+	go func() {
+		_, err := io.Copy(outConn, inConn)
+		errChan <- err
+	}()
+
+	go func() {
+		_, err := io.Copy(inConn, outConn)
+		errChan <- err
+	}()
+
+	select {
+	case <-ctx.Done():
+		f.logger.Trace("forwarder: tearing down TCP connection %v due to context done", id)
+		return
+	case err := <-errChan:
+		if err != nil && !isClosedError(err) {
+			f.logger.Error("proxyTCP: copy error: %v", err)
+		}
+		f.logger.Trace("forwarder: tearing down TCP connection %v", id)
+		return
+	}
+}

client/firewall/uspfilter/forwarder/udp.go

@@ -0,0 +1,288 @@
+package forwarder
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+	"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
+	"gvisor.dev/gvisor/pkg/waiter"
+
+	nblog "github.com/netbirdio/netbird/client/firewall/uspfilter/log"
+)
+
+const (
+	udpTimeout = 30 * time.Second
+)
+
+type udpPacketConn struct {
+	conn     *gonet.UDPConn
+	outConn  net.Conn
+	lastSeen atomic.Int64
+	cancel   context.CancelFunc
+	ep       tcpip.Endpoint
+}
+
+type udpForwarder struct {
+	sync.RWMutex
+	logger  *nblog.Logger
+	conns   map[stack.TransportEndpointID]*udpPacketConn
+	bufPool sync.Pool
+	ctx     context.Context
+	cancel  context.CancelFunc
+}
+
+type idleConn struct {
+	id   stack.TransportEndpointID
+	conn *udpPacketConn
+}
+
+func newUDPForwarder(mtu int, logger *nblog.Logger) *udpForwarder {
+	ctx, cancel := context.WithCancel(context.Background())
+	f := &udpForwarder{
+		logger: logger,
+		conns:  make(map[stack.TransportEndpointID]*udpPacketConn),
+		ctx:    ctx,
+		cancel: cancel,
+		bufPool: sync.Pool{
+			New: func() any {
+				b := make([]byte, mtu)
+				return &b
+			},
+		},
+	}
+	go f.cleanup()
+	return f
+}
+
+// Stop stops the UDP forwarder and all active connections
+func (f *udpForwarder) Stop() {
+	f.cancel()
+
+	f.Lock()
+	defer f.Unlock()
+
+	for id, conn := range f.conns {
+		conn.cancel()
+		if err := conn.conn.Close(); err != nil {
+			f.logger.Debug("forwarder: UDP conn close error for %v: %v", id, err)
+		}
+		if err := conn.outConn.Close(); err != nil {
+			f.logger.Debug("forwarder: UDP outConn close error for %v: %v", id, err)
+		}
+
+		conn.ep.Close()
+		delete(f.conns, id)
+	}
+}
+
+// cleanup periodically removes idle UDP connections
+func (f *udpForwarder) cleanup() {
+	ticker := time.NewTicker(time.Minute)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-f.ctx.Done():
+			return
+		case <-ticker.C:
+			var idleConns []idleConn
+
+			f.RLock()
+			for id, conn := range f.conns {
+				if conn.getIdleDuration() > udpTimeout {
+					idleConns = append(idleConns, idleConn{id, conn})
+				}
+			}
+			f.RUnlock()
+
+			for _, idle := range idleConns {
+				idle.conn.cancel()
+				if err := idle.conn.conn.Close(); err != nil {
+					f.logger.Debug("forwarder: UDP conn close error for %v: %v", idle.id, err)
+				}
+				if err := idle.conn.outConn.Close(); err != nil {
+					f.logger.Debug("forwarder: UDP outConn close error for %v: %v", idle.id, err)
+				}
+
+				idle.conn.ep.Close()
+
+				f.Lock()
+				delete(f.conns, idle.id)
+				f.Unlock()
+
+				f.logger.Trace("forwarder: cleaned up idle UDP connection %v", idle.id)
+			}
+		}
+	}
+}
+
+// handleUDP is called by the UDP forwarder for new packets
+func (f *Forwarder) handleUDP(r *udp.ForwarderRequest) {
+	if f.ctx.Err() != nil {
+		f.logger.Trace("forwarder: context done, dropping UDP packet")
+		return
+	}
+
+	id := r.ID()
+
+	f.udpForwarder.RLock()
+	_, exists := f.udpForwarder.conns[id]
+	f.udpForwarder.RUnlock()
+	if exists {
+		f.logger.Trace("forwarder: existing UDP connection for %v", id)
+		return
+	}
+
+	dstAddr := fmt.Sprintf("%s:%d", f.determineDialAddr(id.LocalAddress), id.LocalPort)
+	outConn, err := (&net.Dialer{}).DialContext(f.ctx, "udp", dstAddr)
+	if err != nil {
+		f.logger.Debug("forwarder: UDP dial error for %v: %v", id, err)
+		// TODO: Send ICMP error message
+		return
+	}
+
+	// Create wait queue for blocking syscalls
+	wq := waiter.Queue{}
+	ep, epErr := r.CreateEndpoint(&wq)
+	if epErr != nil {
+		f.logger.Debug("forwarder: failed to create UDP endpoint: %v", epErr)
+		if err := outConn.Close(); err != nil {
+			f.logger.Debug("forwarder: UDP outConn close error for %v: %v", id, err)
+		}
+		return
+	}
+
+	inConn := gonet.NewUDPConn(f.stack, &wq, ep)
+	connCtx, connCancel := context.WithCancel(f.ctx)
+
+	pConn := &udpPacketConn{
+		conn:    inConn,
+		outConn: outConn,
+		cancel:  connCancel,
+		ep:      ep,
+	}
+	pConn.updateLastSeen()
+
+	f.udpForwarder.Lock()
+	// Double-check no connection was created while we were setting up
+	if _, exists := f.udpForwarder.conns[id]; exists {
+		f.udpForwarder.Unlock()
+		pConn.cancel()
+		if err := inConn.Close(); err != nil {
+			f.logger.Debug("forwarder: UDP inConn close error for %v: %v", id, err)
+		}
+		if err := outConn.Close(); err != nil {
+			f.logger.Debug("forwarder: UDP outConn close error for %v: %v", id, err)
+		}
+		return
+	}
+	f.udpForwarder.conns[id] = pConn
+	f.udpForwarder.Unlock()
+
+	f.logger.Trace("forwarder: established UDP connection to %v", id)
+	go f.proxyUDP(connCtx, pConn, id, ep)
+}
+
+func (f *Forwarder) proxyUDP(ctx context.Context, pConn *udpPacketConn, id stack.TransportEndpointID, ep tcpip.Endpoint) {
+	defer func() {
+		pConn.cancel()
+		if err := pConn.conn.Close(); err != nil {
+			f.logger.Debug("forwarder: UDP inConn close error for %v: %v", id, err)
+		}
+		if err := pConn.outConn.Close(); err != nil {
+			f.logger.Debug("forwarder: UDP outConn close error for %v: %v", id, err)
+		}
+
+		ep.Close()
+
+		f.udpForwarder.Lock()
+		delete(f.udpForwarder.conns, id)
+		f.udpForwarder.Unlock()
+	}()
+
+	errChan := make(chan error, 2)
+
+	go func() {
+		errChan <- pConn.copy(ctx, pConn.conn, pConn.outConn, &f.udpForwarder.bufPool, "outbound->inbound")
+	}()
+
+	go func() {
+		errChan <- pConn.copy(ctx, pConn.outConn, pConn.conn, &f.udpForwarder.bufPool, "inbound->outbound")
+	}()
+
+	select {
+	case <-ctx.Done():
+		f.logger.Trace("forwarder: tearing down UDP connection %v due to context done", id)
+		return
+	case err := <-errChan:
+		if err != nil && !isClosedError(err) {
+			f.logger.Error("proxyUDP: copy error: %v", err)
+		}
+		f.logger.Trace("forwarder: tearing down UDP connection %v", id)
+		return
+	}
+}
+
+func (c *udpPacketConn) updateLastSeen() {
+	c.lastSeen.Store(time.Now().UnixNano())
+}
+
+func (c *udpPacketConn) getIdleDuration() time.Duration {
+	lastSeen := time.Unix(0, c.lastSeen.Load())
+	return time.Since(lastSeen)
+}
+
+func (c *udpPacketConn) copy(ctx context.Context, dst net.Conn, src net.Conn, bufPool *sync.Pool, direction string) error {
+	bufp := bufPool.Get().(*[]byte)
+	defer bufPool.Put(bufp)
+	buffer := *bufp
+
+	if err := src.SetReadDeadline(time.Now().Add(udpTimeout)); err != nil {
+		return fmt.Errorf("set read deadline: %w", err)
+	}
+	if err := src.SetWriteDeadline(time.Now().Add(udpTimeout)); err != nil {
+		return fmt.Errorf("set write deadline: %w", err)
+	}
+
+	for {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+			n, err := src.Read(buffer)
+			if err != nil {
+				if isTimeout(err) {
+					continue
+				}
+				return fmt.Errorf("read from %s: %w", direction, err)
+			}
+
+			_, err = dst.Write(buffer[:n])
+			if err != nil {
+				return fmt.Errorf("write to %s: %w", direction, err)
+			}
+
+			c.updateLastSeen()
+		}
+	}
+}
+
+func isClosedError(err error) bool {
+	return errors.Is(err, net.ErrClosed) || errors.Is(err, context.Canceled)
+}
+
+func isTimeout(err error) bool {
+	var netErr net.Error
+	if errors.As(err, &netErr) {
+		return netErr.Timeout()
+	}
+	return false
+}

client/firewall/uspfilter/localip.go

@@ -0,0 +1,134 @@
+package uspfilter
+
+import (
+	"fmt"
+	"net"
+	"sync"
+
+	log "github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/client/firewall/uspfilter/common"
+)
+
+type localIPManager struct {
+	mu sync.RWMutex
+
+	// Use bitmap for IPv4 (32 bits * 2^16 = 256KB memory)
+	ipv4Bitmap [1 << 16]uint32
+}
+
+func newLocalIPManager() *localIPManager {
+	return &localIPManager{}
+}
+
+func (m *localIPManager) setBitmapBit(ip net.IP) {
+	ipv4 := ip.To4()
+	if ipv4 == nil {
+		return
+	}
+	high := (uint16(ipv4[0]) << 8) | uint16(ipv4[1])
+	low := (uint16(ipv4[2]) << 8) | uint16(ipv4[3])
+	m.ipv4Bitmap[high] |= 1 << (low % 32)
+}
+
+func (m *localIPManager) checkBitmapBit(ip net.IP) bool {
+	ipv4 := ip.To4()
+	if ipv4 == nil {
+		return false
+	}
+	high := (uint16(ipv4[0]) << 8) | uint16(ipv4[1])
+	low := (uint16(ipv4[2]) << 8) | uint16(ipv4[3])
+	return (m.ipv4Bitmap[high] & (1 << (low % 32))) != 0
+}
+
+func (m *localIPManager) processIP(ip net.IP, newIPv4Bitmap *[1 << 16]uint32, ipv4Set map[string]struct{}, ipv4Addresses *[]string) error {
+	if ipv4 := ip.To4(); ipv4 != nil {
+		high := (uint16(ipv4[0]) << 8) | uint16(ipv4[1])
+		low := (uint16(ipv4[2]) << 8) | uint16(ipv4[3])
+		if int(high) >= len(*newIPv4Bitmap) {
+			return fmt.Errorf("invalid IPv4 address: %s", ip)
+		}
+		ipStr := ip.String()
+		if _, exists := ipv4Set[ipStr]; !exists {
+			ipv4Set[ipStr] = struct{}{}
+			*ipv4Addresses = append(*ipv4Addresses, ipStr)
+			newIPv4Bitmap[high] |= 1 << (low % 32)
+		}
+	}
+	return nil
+}
+
+func (m *localIPManager) processInterface(iface net.Interface, newIPv4Bitmap *[1 << 16]uint32, ipv4Set map[string]struct{}, ipv4Addresses *[]string) {
+	addrs, err := iface.Addrs()
+	if err != nil {
+		log.Debugf("get addresses for interface %s failed: %v", iface.Name, err)
+		return
+	}
+
+	for _, addr := range addrs {
+		var ip net.IP
+		switch v := addr.(type) {
+		case *net.IPNet:
+			ip = v.IP
+		case *net.IPAddr:
+			ip = v.IP
+		default:
+			continue
+		}
+
+		if err := m.processIP(ip, newIPv4Bitmap, ipv4Set, ipv4Addresses); err != nil {
+			log.Debugf("process IP failed: %v", err)
+		}
+	}
+}
+
+func (m *localIPManager) UpdateLocalIPs(iface common.IFaceMapper) (err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			err = fmt.Errorf("panic: %v", r)
+		}
+	}()
+
+	var newIPv4Bitmap [1 << 16]uint32
+	ipv4Set := make(map[string]struct{})
+	var ipv4Addresses []string
+
+	// 127.0.0.0/8
+	high := uint16(127) << 8
+	for i := uint16(0); i < 256; i++ {
+		newIPv4Bitmap[high|i] = 0xffffffff
+	}
+
+	if iface != nil {
+		if err := m.processIP(iface.Address().IP, &newIPv4Bitmap, ipv4Set, &ipv4Addresses); err != nil {
+			return err
+		}
+	}
+
+	interfaces, err := net.Interfaces()
+	if err != nil {
+		log.Warnf("failed to get interfaces: %v", err)
+	} else {
+		for _, intf := range interfaces {
+			m.processInterface(intf, &newIPv4Bitmap, ipv4Set, &ipv4Addresses)
+		}
+	}
+
+	m.mu.Lock()
+	m.ipv4Bitmap = newIPv4Bitmap
+	m.mu.Unlock()
+
+	log.Debugf("Local IPv4 addresses: %v", ipv4Addresses)
+	return nil
+}
+
+func (m *localIPManager) IsLocalIP(ip net.IP) bool {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	if ipv4 := ip.To4(); ipv4 != nil {
+		return m.checkBitmapBit(ipv4)
+	}
+
+	return false
+}

client/firewall/uspfilter/localip_test.go

@@ -0,0 +1,270 @@
+package uspfilter
+
+import (
+	"net"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/netbirdio/netbird/client/iface"
+)
+
+func TestLocalIPManager(t *testing.T) {
+	tests := []struct {
+		name      string
+		setupAddr iface.WGAddress
+		testIP    net.IP
+		expected  bool
+	}{
+		{
+			name: "Localhost range",
+			setupAddr: iface.WGAddress{
+				IP: net.ParseIP("192.168.1.1"),
+				Network: &net.IPNet{
+					IP:   net.ParseIP("192.168.1.0"),
+					Mask: net.CIDRMask(24, 32),
+				},
+			},
+			testIP:   net.ParseIP("127.0.0.2"),
+			expected: true,
+		},
+		{
+			name: "Localhost standard address",
+			setupAddr: iface.WGAddress{
+				IP: net.ParseIP("192.168.1.1"),
+				Network: &net.IPNet{
+					IP:   net.ParseIP("192.168.1.0"),
+					Mask: net.CIDRMask(24, 32),
+				},
+			},
+			testIP:   net.ParseIP("127.0.0.1"),
+			expected: true,
+		},
+		{
+			name: "Localhost range edge",
+			setupAddr: iface.WGAddress{
+				IP: net.ParseIP("192.168.1.1"),
+				Network: &net.IPNet{
+					IP:   net.ParseIP("192.168.1.0"),
+					Mask: net.CIDRMask(24, 32),
+				},
+			},
+			testIP:   net.ParseIP("127.255.255.255"),
+			expected: true,
+		},
+		{
+			name: "Local IP matches",
+			setupAddr: iface.WGAddress{
+				IP: net.ParseIP("192.168.1.1"),
+				Network: &net.IPNet{
+					IP:   net.ParseIP("192.168.1.0"),
+					Mask: net.CIDRMask(24, 32),
+				},
+			},
+			testIP:   net.ParseIP("192.168.1.1"),
+			expected: true,
+		},
+		{
+			name: "Local IP doesn't match",
+			setupAddr: iface.WGAddress{
+				IP: net.ParseIP("192.168.1.1"),
+				Network: &net.IPNet{
+					IP:   net.ParseIP("192.168.1.0"),
+					Mask: net.CIDRMask(24, 32),
+				},
+			},
+			testIP:   net.ParseIP("192.168.1.2"),
+			expected: false,
+		},
+		{
+			name: "IPv6 address",
+			setupAddr: iface.WGAddress{
+				IP: net.ParseIP("fe80::1"),
+				Network: &net.IPNet{
+					IP:   net.ParseIP("fe80::"),
+					Mask: net.CIDRMask(64, 128),
+				},
+			},
+			testIP:   net.ParseIP("fe80::1"),
+			expected: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			manager := newLocalIPManager()
+
+			mock := &IFaceMock{
+				AddressFunc: func() iface.WGAddress {
+					return tt.setupAddr
+				},
+			}
+
+			err := manager.UpdateLocalIPs(mock)
+			require.NoError(t, err)
+
+			result := manager.IsLocalIP(tt.testIP)
+			require.Equal(t, tt.expected, result)
+		})
+	}
+}
+
+func TestLocalIPManager_AllInterfaces(t *testing.T) {
+	manager := newLocalIPManager()
+	mock := &IFaceMock{}
+
+	// Get actual local interfaces
+	interfaces, err := net.Interfaces()
+	require.NoError(t, err)
+
+	var tests []struct {
+		ip       string
+		expected bool
+	}
+
+	// Add all local interface IPs to test cases
+	for _, iface := range interfaces {
+		addrs, err := iface.Addrs()
+		require.NoError(t, err)
+
+		for _, addr := range addrs {
+			var ip net.IP
+			switch v := addr.(type) {
+			case *net.IPNet:
+				ip = v.IP
+			case *net.IPAddr:
+				ip = v.IP
+			default:
+				continue
+			}
+
+			if ip4 := ip.To4(); ip4 != nil {
+				tests = append(tests, struct {
+					ip       string
+					expected bool
+				}{
+					ip:       ip4.String(),
+					expected: true,
+				})
+			}
+		}
+	}
+
+	// Add some external IPs as negative test cases
+	externalIPs := []string{
+		"8.8.8.8",
+		"1.1.1.1",
+		"208.67.222.222",
+	}
+	for _, ip := range externalIPs {
+		tests = append(tests, struct {
+			ip       string
+			expected bool
+		}{
+			ip:       ip,
+			expected: false,
+		})
+	}
+
+	require.NotEmpty(t, tests, "No test cases generated")
+
+	err = manager.UpdateLocalIPs(mock)
+	require.NoError(t, err)
+
+	t.Logf("Testing %d IPs", len(tests))
+	for _, tt := range tests {
+		t.Run(tt.ip, func(t *testing.T) {
+			result := manager.IsLocalIP(net.ParseIP(tt.ip))
+			require.Equal(t, tt.expected, result, "IP: %s", tt.ip)
+		})
+	}
+}
+
+// MapImplementation is a version using map[string]struct{}
+type MapImplementation struct {
+	localIPs map[string]struct{}
+}
+
+func BenchmarkIPChecks(b *testing.B) {
+	interfaces := make([]net.IP, 16)
+	for i := range interfaces {
+		interfaces[i] = net.IPv4(10, 0, byte(i>>8), byte(i))
+	}
+
+	// Setup bitmap version
+	bitmapManager := &localIPManager{
+		ipv4Bitmap: [1 << 16]uint32{},
+	}
+	for _, ip := range interfaces[:8] { // Add half of IPs
+		bitmapManager.setBitmapBit(ip)
+	}
+
+	// Setup map version
+	mapManager := &MapImplementation{
+		localIPs: make(map[string]struct{}),
+	}
+	for _, ip := range interfaces[:8] {
+		mapManager.localIPs[ip.String()] = struct{}{}
+	}
+
+	b.Run("Bitmap_Hit", func(b *testing.B) {
+		ip := interfaces[4]
+		b.ResetTimer()
+		for i := 0; i < b.N; i++ {
+			bitmapManager.checkBitmapBit(ip)
+		}
+	})
+
+	b.Run("Bitmap_Miss", func(b *testing.B) {
+		ip := interfaces[12]
+		b.ResetTimer()
+		for i := 0; i < b.N; i++ {
+			bitmapManager.checkBitmapBit(ip)
+		}
+	})
+
+	b.Run("Map_Hit", func(b *testing.B) {
+		ip := interfaces[4]
+		b.ResetTimer()
+		for i := 0; i < b.N; i++ {
+			// nolint:gosimple
+			_, _ = mapManager.localIPs[ip.String()]
+		}
+	})
+
+	b.Run("Map_Miss", func(b *testing.B) {
+		ip := interfaces[12]
+		b.ResetTimer()
+		for i := 0; i < b.N; i++ {
+			// nolint:gosimple
+			_, _ = mapManager.localIPs[ip.String()]
+		}
+	})
+}
+
+func BenchmarkWGPosition(b *testing.B) {
+	wgIP := net.ParseIP("10.10.0.1")
+
+	// Create two managers - one checks WG IP first, other checks it last
+	b.Run("WG_First", func(b *testing.B) {
+		bm := &localIPManager{ipv4Bitmap: [1 << 16]uint32{}}
+		bm.setBitmapBit(wgIP)
+		b.ResetTimer()
+		for i := 0; i < b.N; i++ {
+			bm.checkBitmapBit(wgIP)
+		}
+	})
+
+	b.Run("WG_Last", func(b *testing.B) {
+		bm := &localIPManager{ipv4Bitmap: [1 << 16]uint32{}}
+		// Fill with other IPs first
+		for i := 0; i < 15; i++ {
+			bm.setBitmapBit(net.IPv4(10, 0, byte(i>>8), byte(i)))
+		}
+		bm.setBitmapBit(wgIP) // Add WG IP last
+		b.ResetTimer()
+		for i := 0; i < b.N; i++ {
+			bm.checkBitmapBit(wgIP)
+		}
+	})
+}

client/firewall/uspfilter/log/log.go

@@ -0,0 +1,196 @@
+// Package logger provides a high-performance, non-blocking logger for userspace networking
+package log
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	log "github.com/sirupsen/logrus"
+)
+
+const (
+	maxBatchSize         = 1024 * 16  // 16KB max batch size
+	maxMessageSize       = 1024 * 2   // 2KB per message
+	bufferSize           = 1024 * 256 // 256KB ring buffer
+	defaultFlushInterval = 2 * time.Second
+)
+
+// Level represents log severity
+type Level uint32
+
+const (
+	LevelPanic Level = iota
+	LevelFatal
+	LevelError
+	LevelWarn
+	LevelInfo
+	LevelDebug
+	LevelTrace
+)
+
+var levelStrings = map[Level]string{
+	LevelPanic: "PANC",
+	LevelFatal: "FATL",
+	LevelError: "ERRO",
+	LevelWarn:  "WARN",
+	LevelInfo:  "INFO",
+	LevelDebug: "DEBG",
+	LevelTrace: "TRAC",
+}
+
+// Logger is a high-performance, non-blocking logger
+type Logger struct {
+	output    io.Writer
+	level     atomic.Uint32
+	buffer    *ringBuffer
+	shutdown  chan struct{}
+	closeOnce sync.Once
+	wg        sync.WaitGroup
+
+	// Reusable buffer pool for formatting messages
+	bufPool sync.Pool
+}
+
+func NewFromLogrus(logrusLogger *log.Logger) *Logger {
+	l := &Logger{
+		output:   logrusLogger.Out,
+		buffer:   newRingBuffer(bufferSize),
+		shutdown: make(chan struct{}),
+		bufPool: sync.Pool{
+			New: func() interface{} {
+				// Pre-allocate buffer for message formatting
+				b := make([]byte, 0, maxMessageSize)
+				return &b
+			},
+		},
+	}
+	logrusLevel := logrusLogger.GetLevel()
+	l.level.Store(uint32(logrusLevel))
+	level := levelStrings[Level(logrusLevel)]
+	log.Debugf("New uspfilter logger created with loglevel %v", level)
+
+	l.wg.Add(1)
+	go l.worker()
+
+	return l
+}
+
+func (l *Logger) SetLevel(level Level) {
+	l.level.Store(uint32(level))
+
+	log.Debugf("Set uspfilter logger loglevel to %v", levelStrings[level])
+}
+
+func (l *Logger) formatMessage(buf *[]byte, level Level, format string, args ...interface{}) {
+	*buf = (*buf)[:0]
+
+	// Timestamp
+	*buf = time.Now().AppendFormat(*buf, "2006-01-02T15:04:05-07:00")
+	*buf = append(*buf, ' ')
+
+	// Level
+	*buf = append(*buf, levelStrings[level]...)
+	*buf = append(*buf, ' ')
+
+	// Message
+	if len(args) > 0 {
+		*buf = append(*buf, fmt.Sprintf(format, args...)...)
+	} else {
+		*buf = append(*buf, format...)
+	}
+
+	*buf = append(*buf, '\n')
+}
+
+func (l *Logger) log(level Level, format string, args ...interface{}) {
+	bufp := l.bufPool.Get().(*[]byte)
+	l.formatMessage(bufp, level, format, args...)
+
+	if len(*bufp) > maxMessageSize {
+		*bufp = (*bufp)[:maxMessageSize]
+	}
+	_, _ = l.buffer.Write(*bufp)
+
+	l.bufPool.Put(bufp)
+}
+
+func (l *Logger) Error(format string, args ...interface{}) {
+	if l.level.Load() >= uint32(LevelError) {
+		l.log(LevelError, format, args...)
+	}
+}
+
+func (l *Logger) Warn(format string, args ...interface{}) {
+	if l.level.Load() >= uint32(LevelWarn) {
+		l.log(LevelWarn, format, args...)
+	}
+}
+
+func (l *Logger) Info(format string, args ...interface{}) {
+	if l.level.Load() >= uint32(LevelInfo) {
+		l.log(LevelInfo, format, args...)
+	}
+}
+
+func (l *Logger) Debug(format string, args ...interface{}) {
+	if l.level.Load() >= uint32(LevelDebug) {
+		l.log(LevelDebug, format, args...)
+	}
+}
+
+func (l *Logger) Trace(format string, args ...interface{}) {
+	if l.level.Load() >= uint32(LevelTrace) {
+		l.log(LevelTrace, format, args...)
+	}
+}
+
+// worker periodically flushes the buffer
+func (l *Logger) worker() {
+	defer l.wg.Done()
+
+	ticker := time.NewTicker(defaultFlushInterval)
+	defer ticker.Stop()
+
+	buf := make([]byte, 0, maxBatchSize)
+
+	for {
+		select {
+		case <-l.shutdown:
+			return
+		case <-ticker.C:
+			// Read accumulated messages
+			n, _ := l.buffer.Read(buf[:cap(buf)])
+			if n == 0 {
+				continue
+			}
+
+			// Write batch
+			_, _ = l.output.Write(buf[:n])
+		}
+	}
+}
+
+// Stop gracefully shuts down the logger
+func (l *Logger) Stop(ctx context.Context) error {
+	done := make(chan struct{})
+
+	l.closeOnce.Do(func() {
+		close(l.shutdown)
+	})
+
+	go func() {
+		l.wg.Wait()
+		close(done)
+	}()
+
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case <-done:
+		return nil
+	}
+}

client/firewall/uspfilter/log/ringbuffer.go

@@ -0,0 +1,85 @@
+package log
+
+import "sync"
+
+// ringBuffer is a simple ring buffer implementation
+type ringBuffer struct {
+	buf  []byte
+	size int
+	r, w int64 // Read and write positions
+	mu   sync.Mutex
+}
+
+func newRingBuffer(size int) *ringBuffer {
+	return &ringBuffer{
+		buf:  make([]byte, size),
+		size: size,
+	}
+}
+
+func (r *ringBuffer) Write(p []byte) (n int, err error) {
+	if len(p) == 0 {
+		return 0, nil
+	}
+
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	if len(p) > r.size {
+		p = p[:r.size]
+	}
+
+	n = len(p)
+
+	// Write data, handling wrap-around
+	pos := int(r.w % int64(r.size))
+	writeLen := min(len(p), r.size-pos)
+	copy(r.buf[pos:], p[:writeLen])
+
+	// If we have more data and need to wrap around
+	if writeLen < len(p) {
+		copy(r.buf, p[writeLen:])
+	}
+
+	// Update write position
+	r.w += int64(n)
+
+	return n, nil
+}
+
+func (r *ringBuffer) Read(p []byte) (n int, err error) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	if r.w == r.r {
+		return 0, nil
+	}
+
+	// Calculate available data accounting for wraparound
+	available := int(r.w - r.r)
+	if available < 0 {
+		available += r.size
+	}
+	available = min(available, r.size)
+
+	// Limit read to buffer size
+	toRead := min(available, len(p))
+	if toRead == 0 {
+		return 0, nil
+	}
+
+	// Read data, handling wrap-around
+	pos := int(r.r % int64(r.size))
+	readLen := min(toRead, r.size-pos)
+	n = copy(p, r.buf[pos:pos+readLen])
+
+	// If we need more data and need to wrap around
+	if readLen < toRead {
+		n += copy(p[readLen:toRead], r.buf[:toRead-readLen])
+	}
+
+	// Update read position
+	r.r += int64(n)
+
+	return n, nil
+}

client/firewall/uspfilter/rule.go

@@ -2,14 +2,15 @@ package uspfilter
 
 import (
 	"net"
+	"net/netip"
 
 	"github.com/google/gopacket"
 
 	firewall "github.com/netbirdio/netbird/client/firewall/manager"
 )
 
-// Rule to handle management of rules
+// PeerRule to handle management of rules
-type Rule struct {
+type PeerRule struct {
 	id         string
 	ip         net.IP
 	ipLayer    gopacket.LayerType
@@ -24,6 +25,21 @@ type Rule struct {
 }
 
 // GetRuleID returns the rule id
-func (r *Rule) GetRuleID() string {
+func (r *PeerRule) GetRuleID() string {
+	return r.id
+}
+
+type RouteRule struct {
+	id          string
+	sources     []netip.Prefix
+	destination netip.Prefix
+	proto       firewall.Protocol
+	srcPort     *firewall.Port
+	dstPort     *firewall.Port
+	action      firewall.Action
+}
+
+// GetRuleID returns the rule id
+func (r *RouteRule) GetRuleID() string {
 	return r.id
 }

client/firewall/uspfilter/tracer.go

@@ -0,0 +1,390 @@
+package uspfilter
+
+import (
+	"fmt"
+	"net"
+	"time"
+
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/layers"
+
+	fw "github.com/netbirdio/netbird/client/firewall/manager"
+	"github.com/netbirdio/netbird/client/firewall/uspfilter/conntrack"
+)
+
+type PacketStage int
+
+const (
+	StageReceived PacketStage = iota
+	StageConntrack
+	StagePeerACL
+	StageRouting
+	StageRouteACL
+	StageForwarding
+	StageCompleted
+)
+
+const msgProcessingCompleted = "Processing completed"
+
+func (s PacketStage) String() string {
+	return map[PacketStage]string{
+		StageReceived:   "Received",
+		StageConntrack:  "Connection Tracking",
+		StagePeerACL:    "Peer ACL",
+		StageRouting:    "Routing",
+		StageRouteACL:   "Route ACL",
+		StageForwarding: "Forwarding",
+		StageCompleted:  "Completed",
+	}[s]
+}
+
+type ForwarderAction struct {
+	Action     string
+	RemoteAddr string
+	Error      error
+}
+
+type TraceResult struct {
+	Timestamp       time.Time
+	Stage           PacketStage
+	Message         string
+	Allowed         bool
+	ForwarderAction *ForwarderAction
+}
+
+type PacketTrace struct {
+	SourceIP        net.IP
+	DestinationIP   net.IP
+	Protocol        string
+	SourcePort      uint16
+	DestinationPort uint16
+	Direction       fw.RuleDirection
+	Results         []TraceResult
+}
+
+type TCPState struct {
+	SYN bool
+	ACK bool
+	FIN bool
+	RST bool
+	PSH bool
+	URG bool
+}
+
+type PacketBuilder struct {
+	SrcIP       net.IP
+	DstIP       net.IP
+	Protocol    fw.Protocol
+	SrcPort     uint16
+	DstPort     uint16
+	ICMPType    uint8
+	ICMPCode    uint8
+	Direction   fw.RuleDirection
+	PayloadSize int
+	TCPState    *TCPState
+}
+
+func (t *PacketTrace) AddResult(stage PacketStage, message string, allowed bool) {
+	t.Results = append(t.Results, TraceResult{
+		Timestamp: time.Now(),
+		Stage:     stage,
+		Message:   message,
+		Allowed:   allowed,
+	})
+}
+
+func (t *PacketTrace) AddResultWithForwarder(stage PacketStage, message string, allowed bool, action *ForwarderAction) {
+	t.Results = append(t.Results, TraceResult{
+		Timestamp:       time.Now(),
+		Stage:           stage,
+		Message:         message,
+		Allowed:         allowed,
+		ForwarderAction: action,
+	})
+}
+
+func (p *PacketBuilder) Build() ([]byte, error) {
+	ip := p.buildIPLayer()
+	pktLayers := []gopacket.SerializableLayer{ip}
+
+	transportLayer, err := p.buildTransportLayer(ip)
+	if err != nil {
+		return nil, err
+	}
+	pktLayers = append(pktLayers, transportLayer...)
+
+	if p.PayloadSize > 0 {
+		payload := make([]byte, p.PayloadSize)
+		pktLayers = append(pktLayers, gopacket.Payload(payload))
+	}
+
+	return serializePacket(pktLayers)
+}
+
+func (p *PacketBuilder) buildIPLayer() *layers.IPv4 {
+	return &layers.IPv4{
+		Version:  4,
+		TTL:      64,
+		Protocol: layers.IPProtocol(getIPProtocolNumber(p.Protocol)),
+		SrcIP:    p.SrcIP,
+		DstIP:    p.DstIP,
+	}
+}
+
+func (p *PacketBuilder) buildTransportLayer(ip *layers.IPv4) ([]gopacket.SerializableLayer, error) {
+	switch p.Protocol {
+	case "tcp":
+		return p.buildTCPLayer(ip)
+	case "udp":
+		return p.buildUDPLayer(ip)
+	case "icmp":
+		return p.buildICMPLayer()
+	default:
+		return nil, fmt.Errorf("unsupported protocol: %s", p.Protocol)
+	}
+}
+
+func (p *PacketBuilder) buildTCPLayer(ip *layers.IPv4) ([]gopacket.SerializableLayer, error) {
+	tcp := &layers.TCP{
+		SrcPort: layers.TCPPort(p.SrcPort),
+		DstPort: layers.TCPPort(p.DstPort),
+		Window:  65535,
+		SYN:     p.TCPState != nil && p.TCPState.SYN,
+		ACK:     p.TCPState != nil && p.TCPState.ACK,
+		FIN:     p.TCPState != nil && p.TCPState.FIN,
+		RST:     p.TCPState != nil && p.TCPState.RST,
+		PSH:     p.TCPState != nil && p.TCPState.PSH,
+		URG:     p.TCPState != nil && p.TCPState.URG,
+	}
+	if err := tcp.SetNetworkLayerForChecksum(ip); err != nil {
+		return nil, fmt.Errorf("set network layer for TCP checksum: %w", err)
+	}
+	return []gopacket.SerializableLayer{tcp}, nil
+}
+
+func (p *PacketBuilder) buildUDPLayer(ip *layers.IPv4) ([]gopacket.SerializableLayer, error) {
+	udp := &layers.UDP{
+		SrcPort: layers.UDPPort(p.SrcPort),
+		DstPort: layers.UDPPort(p.DstPort),
+	}
+	if err := udp.SetNetworkLayerForChecksum(ip); err != nil {
+		return nil, fmt.Errorf("set network layer for UDP checksum: %w", err)
+	}
+	return []gopacket.SerializableLayer{udp}, nil
+}
+
+func (p *PacketBuilder) buildICMPLayer() ([]gopacket.SerializableLayer, error) {
+	icmp := &layers.ICMPv4{
+		TypeCode: layers.CreateICMPv4TypeCode(p.ICMPType, p.ICMPCode),
+	}
+	if p.ICMPType == layers.ICMPv4TypeEchoRequest || p.ICMPType == layers.ICMPv4TypeEchoReply {
+		icmp.Id = uint16(1)
+		icmp.Seq = uint16(1)
+	}
+	return []gopacket.SerializableLayer{icmp}, nil
+}
+
+func serializePacket(layers []gopacket.SerializableLayer) ([]byte, error) {
+	buf := gopacket.NewSerializeBuffer()
+	opts := gopacket.SerializeOptions{
+		ComputeChecksums: true,
+		FixLengths:       true,
+	}
+	if err := gopacket.SerializeLayers(buf, opts, layers...); err != nil {
+		return nil, fmt.Errorf("serialize packet: %w", err)
+	}
+	return buf.Bytes(), nil
+}
+
+func getIPProtocolNumber(protocol fw.Protocol) int {
+	switch protocol {
+	case fw.ProtocolTCP:
+		return int(layers.IPProtocolTCP)
+	case fw.ProtocolUDP:
+		return int(layers.IPProtocolUDP)
+	case fw.ProtocolICMP:
+		return int(layers.IPProtocolICMPv4)
+	default:
+		return 0
+	}
+}
+
+func (m *Manager) TracePacketFromBuilder(builder *PacketBuilder) (*PacketTrace, error) {
+	packetData, err := builder.Build()
+	if err != nil {
+		return nil, fmt.Errorf("build packet: %w", err)
+	}
+
+	return m.TracePacket(packetData, builder.Direction), nil
+}
+
+func (m *Manager) TracePacket(packetData []byte, direction fw.RuleDirection) *PacketTrace {
+
+	d := m.decoders.Get().(*decoder)
+	defer m.decoders.Put(d)
+
+	trace := &PacketTrace{Direction: direction}
+
+	// Initial packet decoding
+	if err := d.parser.DecodeLayers(packetData, &d.decoded); err != nil {
+		trace.AddResult(StageReceived, fmt.Sprintf("Failed to decode packet: %v", err), false)
+		return trace
+	}
+
+	// Extract base packet info
+	srcIP, dstIP := m.extractIPs(d)
+	trace.SourceIP = srcIP
+	trace.DestinationIP = dstIP
+
+	// Determine protocol and ports
+	switch d.decoded[1] {
+	case layers.LayerTypeTCP:
+		trace.Protocol = "TCP"
+		trace.SourcePort = uint16(d.tcp.SrcPort)
+		trace.DestinationPort = uint16(d.tcp.DstPort)
+	case layers.LayerTypeUDP:
+		trace.Protocol = "UDP"
+		trace.SourcePort = uint16(d.udp.SrcPort)
+		trace.DestinationPort = uint16(d.udp.DstPort)
+	case layers.LayerTypeICMPv4:
+		trace.Protocol = "ICMP"
+	}
+
+	trace.AddResult(StageReceived, fmt.Sprintf("Received %s packet: %s:%d -> %s:%d",
+		trace.Protocol, srcIP, trace.SourcePort, dstIP, trace.DestinationPort), true)
+
+	if direction == fw.RuleDirectionOUT {
+		return m.traceOutbound(packetData, trace)
+	}
+
+	return m.traceInbound(packetData, trace, d, srcIP, dstIP)
+}
+
+func (m *Manager) traceInbound(packetData []byte, trace *PacketTrace, d *decoder, srcIP net.IP, dstIP net.IP) *PacketTrace {
+	if m.stateful && m.handleConntrackState(trace, d, srcIP, dstIP) {
+		return trace
+	}
+
+	if m.handleLocalDelivery(trace, packetData, d, srcIP, dstIP) {
+		return trace
+	}
+
+	if !m.handleRouting(trace) {
+		return trace
+	}
+
+	if m.nativeRouter {
+		return m.handleNativeRouter(trace)
+	}
+
+	return m.handleRouteACLs(trace, d, srcIP, dstIP)
+}
+
+func (m *Manager) handleConntrackState(trace *PacketTrace, d *decoder, srcIP, dstIP net.IP) bool {
+	allowed := m.isValidTrackedConnection(d, srcIP, dstIP)
+	msg := "No existing connection found"
+	if allowed {
+		msg = m.buildConntrackStateMessage(d)
+		trace.AddResult(StageConntrack, msg, true)
+		trace.AddResult(StageCompleted, "Packet allowed by connection tracking", true)
+		return true
+	}
+	trace.AddResult(StageConntrack, msg, false)
+	return false
+}
+
+func (m *Manager) buildConntrackStateMessage(d *decoder) string {
+	msg := "Matched existing connection state"
+	switch d.decoded[1] {
+	case layers.LayerTypeTCP:
+		flags := getTCPFlags(&d.tcp)
+		msg += fmt.Sprintf(" (TCP Flags: SYN=%v ACK=%v RST=%v FIN=%v)",
+			flags&conntrack.TCPSyn != 0,
+			flags&conntrack.TCPAck != 0,
+			flags&conntrack.TCPRst != 0,
+			flags&conntrack.TCPFin != 0)
+	case layers.LayerTypeICMPv4:
+		msg += fmt.Sprintf(" (ICMP ID=%d, Seq=%d)", d.icmp4.Id, d.icmp4.Seq)
+	}
+	return msg
+}
+
+func (m *Manager) handleLocalDelivery(trace *PacketTrace, packetData []byte, d *decoder, srcIP, dstIP net.IP) bool {
+	if !m.localForwarding {
+		trace.AddResult(StageRouting, "Local forwarding disabled", false)
+		trace.AddResult(StageCompleted, "Packet dropped - local forwarding disabled", false)
+		return true
+	}
+
+	trace.AddResult(StageRouting, "Packet destined for local delivery", true)
+	blocked := m.peerACLsBlock(srcIP, packetData, m.incomingRules, d)
+
+	msg := "Allowed by peer ACL rules"
+	if blocked {
+		msg = "Blocked by peer ACL rules"
+	}
+	trace.AddResult(StagePeerACL, msg, !blocked)
+
+	if m.netstack {
+		m.addForwardingResult(trace, "proxy-local", "127.0.0.1", !blocked)
+	}
+
+	trace.AddResult(StageCompleted, msgProcessingCompleted, !blocked)
+	return true
+}
+
+func (m *Manager) handleRouting(trace *PacketTrace) bool {
+	if !m.routingEnabled {
+		trace.AddResult(StageRouting, "Routing disabled", false)
+		trace.AddResult(StageCompleted, "Packet dropped - routing disabled", false)
+		return false
+	}
+	trace.AddResult(StageRouting, "Routing enabled, checking ACLs", true)
+	return true
+}
+
+func (m *Manager) handleNativeRouter(trace *PacketTrace) *PacketTrace {
+	trace.AddResult(StageRouteACL, "Using native router, skipping ACL checks", true)
+	trace.AddResult(StageForwarding, "Forwarding via native router", true)
+	trace.AddResult(StageCompleted, msgProcessingCompleted, true)
+	return trace
+}
+
+func (m *Manager) handleRouteACLs(trace *PacketTrace, d *decoder, srcIP, dstIP net.IP) *PacketTrace {
+	proto := getProtocolFromPacket(d)
+	srcPort, dstPort := getPortsFromPacket(d)
+	allowed := m.routeACLsPass(srcIP, dstIP, proto, srcPort, dstPort)
+
+	msg := "Allowed by route ACLs"
+	if !allowed {
+		msg = "Blocked by route ACLs"
+	}
+	trace.AddResult(StageRouteACL, msg, allowed)
+
+	if allowed && m.forwarder != nil {
+		m.addForwardingResult(trace, "proxy-remote", fmt.Sprintf("%s:%d", dstIP, dstPort), true)
+	}
+
+	trace.AddResult(StageCompleted, msgProcessingCompleted, allowed)
+	return trace
+}
+
+func (m *Manager) addForwardingResult(trace *PacketTrace, action, remoteAddr string, allowed bool) {
+	fwdAction := &ForwarderAction{
+		Action:     action,
+		RemoteAddr: remoteAddr,
+	}
+	trace.AddResultWithForwarder(StageForwarding,
+		fmt.Sprintf("Forwarding to %s", fwdAction.Action), allowed, fwdAction)
+}
+
+func (m *Manager) traceOutbound(packetData []byte, trace *PacketTrace) *PacketTrace {
+	// will create or update the connection state
+	dropped := m.processOutgoingHooks(packetData)
+	if dropped {
+		trace.AddResult(StageCompleted, "Packet dropped by outgoing hook", false)
+	} else {
+		trace.AddResult(StageCompleted, "Packet allowed (outgoing)", true)
+	}
+	return trace
+}

client/firewall/uspfilter/uspfilter.go

@@ -1,11 +1,14 @@
 package uspfilter
 
 import (
+	"errors"
 	"fmt"
 	"net"
 	"net/netip"
 	"os"
+	"slices"
 	"strconv"
+	"strings"
 	"sync"
 
 	"github.com/google/gopacket"
@@ -14,28 +17,48 @@ import (
 	log "github.com/sirupsen/logrus"
 
 	firewall "github.com/netbirdio/netbird/client/firewall/manager"
+	"github.com/netbirdio/netbird/client/firewall/uspfilter/common"
 	"github.com/netbirdio/netbird/client/firewall/uspfilter/conntrack"
-	"github.com/netbirdio/netbird/client/iface"
+	"github.com/netbirdio/netbird/client/firewall/uspfilter/forwarder"
-	"github.com/netbirdio/netbird/client/iface/device"
+	nblog "github.com/netbirdio/netbird/client/firewall/uspfilter/log"
+	"github.com/netbirdio/netbird/client/iface/netstack"
 	"github.com/netbirdio/netbird/client/internal/statemanager"
 )
 
 const layerTypeAll = 0
 
-const EnvDisableConntrack = "NB_DISABLE_CONNTRACK"
+const (
+	// EnvDisableConntrack disables the stateful filter, replies to outbound traffic won't be allowed.
+	EnvDisableConntrack = "NB_DISABLE_CONNTRACK"
 
-var (
+	// EnvDisableUserspaceRouting disables userspace routing, to-be-routed packets will be dropped.
-	errRouteNotSupported = fmt.Errorf("route not supported with userspace firewall")
+	EnvDisableUserspaceRouting = "NB_DISABLE_USERSPACE_ROUTING"
+
+	// EnvForceUserspaceRouter forces userspace routing even if native routing is available.
+	EnvForceUserspaceRouter = "NB_FORCE_USERSPACE_ROUTER"
+
+	// EnvEnableNetstackLocalForwarding enables forwarding of local traffic to the native stack when running netstack
+	// Leaving this on by default introduces a security risk as sockets on listening on localhost only will be accessible
+	EnvEnableNetstackLocalForwarding = "NB_ENABLE_NETSTACK_LOCAL_FORWARDING"
 )
 
-// IFaceMapper defines subset methods of interface required for manager
-type IFaceMapper interface {
-	SetFilter(device.PacketFilter) error
-	Address() iface.WGAddress
-}
-
 // RuleSet is a set of rules grouped by a string key
-type RuleSet map[string]Rule
+type RuleSet map[string]PeerRule
+
+type RouteRules []RouteRule
+
+func (r RouteRules) Sort() {
+	slices.SortStableFunc(r, func(a, b RouteRule) int {
+		// Deny rules come first
+		if a.action == firewall.ActionDrop && b.action != firewall.ActionDrop {
+			return -1
+		}
+		if a.action != firewall.ActionDrop && b.action == firewall.ActionDrop {
+			return 1
+		}
+		return strings.Compare(a.id, b.id)
+	})
+}
 
 // Manager userspace firewall manager
 type Manager struct {
@@ -43,17 +66,32 @@ type Manager struct {
 	outgoingRules map[string]RuleSet
 	// incomingRules is used for filtering and hooks
 	incomingRules  map[string]RuleSet
+	routeRules     RouteRules
 	wgNetwork      *net.IPNet
 	decoders       sync.Pool
-	wgIface        IFaceMapper
+	wgIface        common.IFaceMapper
 	nativeFirewall firewall.Manager
 
 	mutex sync.RWMutex
 
-	stateful    bool
+	// indicates whether we forward packets not destined for ourselves
+	routingEnabled bool
+	// indicates whether we leave forwarding and filtering to the native firewall
+	nativeRouter bool
+	// indicates whether we track outbound connections
+	stateful bool
+	// indicates whether wireguards runs in netstack mode
+	netstack bool
+	// indicates whether we forward local traffic to the native stack
+	localForwarding bool
+
+	localipmanager *localIPManager
+
 	udpTracker  *conntrack.UDPTracker
 	icmpTracker *conntrack.ICMPTracker
 	tcpTracker  *conntrack.TCPTracker
+	forwarder   *forwarder.Forwarder
+	logger      *nblog.Logger
 }
 
 // decoder for packages
@@ -70,22 +108,32 @@ type decoder struct {
 }
 
 // Create userspace firewall manager constructor
-func Create(iface IFaceMapper) (*Manager, error) {
+func Create(iface common.IFaceMapper, disableServerRoutes bool) (*Manager, error) {
-	return create(iface)
+	return create(iface, nil, disableServerRoutes)
 }
 
-func CreateWithNativeFirewall(iface IFaceMapper, nativeFirewall firewall.Manager) (*Manager, error) {
+func CreateWithNativeFirewall(iface common.IFaceMapper, nativeFirewall firewall.Manager, disableServerRoutes bool) (*Manager, error) {
-	mgr, err := create(iface)
+	if nativeFirewall == nil {
+		return nil, errors.New("native firewall is nil")
+	}
+
+	mgr, err := create(iface, nativeFirewall, disableServerRoutes)
 	if err != nil {
 		return nil, err
 	}
 
-	mgr.nativeFirewall = nativeFirewall
 	return mgr, nil
 }
 
-func create(iface IFaceMapper) (*Manager, error) {
+func create(iface common.IFaceMapper, nativeFirewall firewall.Manager, disableServerRoutes bool) (*Manager, error) {
-	disableConntrack, _ := strconv.ParseBool(os.Getenv(EnvDisableConntrack))
+	disableConntrack, err := strconv.ParseBool(os.Getenv(EnvDisableConntrack))
+	if err != nil {
+		log.Warnf("failed to parse %s: %v", EnvDisableConntrack, err)
+	}
+	enableLocalForwarding, err := strconv.ParseBool(os.Getenv(EnvEnableNetstackLocalForwarding))
+	if err != nil {
+		log.Warnf("failed to parse %s: %v", EnvEnableNetstackLocalForwarding, err)
+	}
 
 	m := &Manager{
 		decoders: sync.Pool{
@@ -101,52 +149,161 @@ func create(iface IFaceMapper) (*Manager, error) {
 				return d
 			},
 		},
-		outgoingRules: make(map[string]RuleSet),
+		nativeFirewall: nativeFirewall,
-		incomingRules: make(map[string]RuleSet),
+		outgoingRules:  make(map[string]RuleSet),
-		wgIface:       iface,
+		incomingRules:  make(map[string]RuleSet),
-		stateful:      !disableConntrack,
+		wgIface:        iface,
+		localipmanager: newLocalIPManager(),
+		routingEnabled: false,
+		stateful:       !disableConntrack,
+		logger:         nblog.NewFromLogrus(log.StandardLogger()),
+		netstack:       netstack.IsEnabled(),
+		// default true for non-netstack, for netstack only if explicitly enabled
+		localForwarding: !netstack.IsEnabled() || enableLocalForwarding,
+	}
+
+	if err := m.localipmanager.UpdateLocalIPs(iface); err != nil {
+		return nil, fmt.Errorf("update local IPs: %w", err)
 	}
 
 	// Only initialize trackers if stateful mode is enabled
 	if disableConntrack {
 		log.Info("conntrack is disabled")
 	} else {
-		m.udpTracker = conntrack.NewUDPTracker(conntrack.DefaultUDPTimeout)
+		m.udpTracker = conntrack.NewUDPTracker(conntrack.DefaultUDPTimeout, m.logger)
-		m.icmpTracker = conntrack.NewICMPTracker(conntrack.DefaultICMPTimeout)
+		m.icmpTracker = conntrack.NewICMPTracker(conntrack.DefaultICMPTimeout, m.logger)
-		m.tcpTracker = conntrack.NewTCPTracker(conntrack.DefaultTCPTimeout)
+		m.tcpTracker = conntrack.NewTCPTracker(conntrack.DefaultTCPTimeout, m.logger)
+	}
+
+	m.determineRouting(iface, disableServerRoutes)
+
+	if err := m.blockInvalidRouted(iface); err != nil {
+		log.Errorf("failed to block invalid routed traffic: %v", err)
 	}
 
 	if err := iface.SetFilter(m); err != nil {
-		return nil, err
+		return nil, fmt.Errorf("set filter: %w", err)
 	}
 	return m, nil
 }
 
+func (m *Manager) blockInvalidRouted(iface common.IFaceMapper) error {
+	if m.forwarder == nil {
+		return nil
+	}
+	wgPrefix, err := netip.ParsePrefix(iface.Address().Network.String())
+	if err != nil {
+		return fmt.Errorf("parse wireguard network: %w", err)
+	}
+	log.Debugf("blocking invalid routed traffic for %s", wgPrefix)
+
+	if _, err := m.AddRouteFiltering(
+		[]netip.Prefix{netip.PrefixFrom(netip.IPv4Unspecified(), 0)},
+		wgPrefix,
+		firewall.ProtocolALL,
+		nil,
+		nil,
+		firewall.ActionDrop,
+	); err != nil {
+		return fmt.Errorf("block wg nte : %w", err)
+	}
+
+	// TODO: Block networks that we're a client of
+
+	return nil
+}
+
+func (m *Manager) determineRouting(iface common.IFaceMapper, disableServerRoutes bool) {
+	disableUspRouting, _ := strconv.ParseBool(os.Getenv(EnvDisableUserspaceRouting))
+	forceUserspaceRouter, _ := strconv.ParseBool(os.Getenv(EnvForceUserspaceRouter))
+
+	switch {
+	case disableUspRouting:
+		m.routingEnabled = false
+		m.nativeRouter = false
+		log.Info("userspace routing is disabled")
+
+	case disableServerRoutes:
+		//  if server routes are disabled we will let packets pass to the native stack
+		m.routingEnabled = true
+		m.nativeRouter = true
+
+		log.Info("server routes are disabled")
+
+	case forceUserspaceRouter:
+		m.routingEnabled = true
+		m.nativeRouter = false
+
+		log.Info("userspace routing is forced")
+
+	case !m.netstack && m.nativeFirewall != nil && m.nativeFirewall.IsServerRouteSupported():
+		// if the OS supports routing natively, then we don't need to filter/route ourselves
+		// netstack mode won't support native routing as there is no interface
+
+		m.routingEnabled = true
+		m.nativeRouter = true
+
+		log.Info("native routing is enabled")
+
+	default:
+		m.routingEnabled = true
+		m.nativeRouter = false
+
+		log.Info("userspace routing enabled by default")
+	}
+
+	// netstack needs the forwarder for local traffic
+	if m.netstack && m.localForwarding ||
+		m.routingEnabled && !m.nativeRouter {
+
+		m.initForwarder(iface)
+	}
+}
+
+// initForwarder initializes the forwarder, it disables routing on errors
+func (m *Manager) initForwarder(iface common.IFaceMapper) {
+	// Only supported in userspace mode as we need to inject packets back into wireguard directly
+	intf := iface.GetWGDevice()
+	if intf == nil {
+		log.Info("forwarding not supported")
+		m.routingEnabled = false
+		return
+	}
+
+	forwarder, err := forwarder.New(iface, m.logger, m.netstack)
+	if err != nil {
+		log.Errorf("failed to create forwarder: %v", err)
+		m.routingEnabled = false
+		return
+	}
+
+	m.forwarder = forwarder
+}
+
 func (m *Manager) Init(*statemanager.Manager) error {
 	return nil
 }
 
 func (m *Manager) IsServerRouteSupported() bool {
-	if m.nativeFirewall == nil {
+	return m.nativeFirewall != nil || m.routingEnabled && m.forwarder != nil
-		return false
-	} else {
-		return true
-	}
 }
 
 func (m *Manager) AddNatRule(pair firewall.RouterPair) error {
-	if m.nativeFirewall == nil {
+	if m.nativeRouter && m.nativeFirewall != nil {
-		return errRouteNotSupported
+		return m.nativeFirewall.AddNatRule(pair)
 	}
-	return m.nativeFirewall.AddNatRule(pair)
+
+	// userspace routed packets are always SNATed to the inbound direction
+	// TODO: implement outbound SNAT
+	return nil
 }
 
 // RemoveNatRule removes a routing firewall rule
 func (m *Manager) RemoveNatRule(pair firewall.RouterPair) error {
-	if m.nativeFirewall == nil {
+	if m.nativeRouter && m.nativeFirewall != nil {
-		return errRouteNotSupported
+		return m.nativeFirewall.RemoveNatRule(pair)
 	}
-	return m.nativeFirewall.RemoveNatRule(pair)
+	return nil
 }
 
 // AddPeerFiltering rule to the firewall
@@ -162,7 +319,7 @@ func (m *Manager) AddPeerFiltering(
 	_ string,
 	comment string,
 ) ([]firewall.Rule, error) {
-	r := Rule{
+	r := PeerRule{
 		id:        uuid.New().String(),
 		ip:        ip,
 		ipLayer:   layers.LayerTypeIPv6,
@@ -205,18 +362,56 @@ func (m *Manager) AddPeerFiltering(
 	return []firewall.Rule{&r}, nil
 }
 
-func (m *Manager) AddRouteFiltering(sources []netip.Prefix, destination netip.Prefix, proto firewall.Protocol, sPort *firewall.Port, dPort *firewall.Port, action firewall.Action) (firewall.Rule, error) {
+func (m *Manager) AddRouteFiltering(
-	if m.nativeFirewall == nil {
+	sources []netip.Prefix,
-		return nil, errRouteNotSupported
+	destination netip.Prefix,
+	proto firewall.Protocol,
+	sPort *firewall.Port,
+	dPort *firewall.Port,
+	action firewall.Action,
+) (firewall.Rule, error) {
+	if m.nativeRouter && m.nativeFirewall != nil {
+		return m.nativeFirewall.AddRouteFiltering(sources, destination, proto, sPort, dPort, action)
 	}
-	return m.nativeFirewall.AddRouteFiltering(sources, destination, proto, sPort, dPort, action)
+
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	ruleID := uuid.New().String()
+	rule := RouteRule{
+		id:          ruleID,
+		sources:     sources,
+		destination: destination,
+		proto:       proto,
+		srcPort:     sPort,
+		dstPort:     dPort,
+		action:      action,
+	}
+
+	m.routeRules = append(m.routeRules, rule)
+	m.routeRules.Sort()
+
+	return &rule, nil
 }
 
 func (m *Manager) DeleteRouteRule(rule firewall.Rule) error {
-	if m.nativeFirewall == nil {
+	if m.nativeRouter && m.nativeFirewall != nil {
-		return errRouteNotSupported
+		return m.nativeFirewall.DeleteRouteRule(rule)
 	}
-	return m.nativeFirewall.DeleteRouteRule(rule)
+
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	ruleID := rule.GetRuleID()
+	idx := slices.IndexFunc(m.routeRules, func(r RouteRule) bool {
+		return r.id == ruleID
+	})
+	if idx < 0 {
+		return fmt.Errorf("route rule not found: %s", ruleID)
+	}
+
+	m.routeRules = slices.Delete(m.routeRules, idx, idx+1)
+	return nil
 }
 
 // DeletePeerRule from the firewall by rule definition
@@ -224,7 +419,7 @@ func (m *Manager) DeletePeerRule(rule firewall.Rule) error {
 	m.mutex.Lock()
 	defer m.mutex.Unlock()
 
-	r, ok := rule.(*Rule)
+	r, ok := rule.(*PeerRule)
 	if !ok {
 		return fmt.Errorf("delete rule: invalid rule type: %T", rule)
 	}
@@ -255,10 +450,14 @@ func (m *Manager) DropOutgoing(packetData []byte) bool {
 
 // DropIncoming filter incoming packets
 func (m *Manager) DropIncoming(packetData []byte) bool {
-	return m.dropFilter(packetData, m.incomingRules)
+	return m.dropFilter(packetData)
+}
+
+// UpdateLocalIPs updates the list of local IPs
+func (m *Manager) UpdateLocalIPs() error {
+	return m.localipmanager.UpdateLocalIPs(m.wgIface)
 }
 
-// processOutgoingHooks processes UDP hooks for outgoing packets and tracks TCP/UDP/ICMP
 func (m *Manager) processOutgoingHooks(packetData []byte) bool {
 	m.mutex.RLock()
 	defer m.mutex.RUnlock()
@@ -279,18 +478,11 @@ func (m *Manager) processOutgoingHooks(packetData []byte) bool {
 		return false
 	}
 
-	// Always process UDP hooks
+	// Track all protocols if stateful mode is enabled
-	if d.decoded[1] == layers.LayerTypeUDP {
-		// Track UDP state only if enabled
-		if m.stateful {
-			m.trackUDPOutbound(d, srcIP, dstIP)
-		}
-		return m.checkUDPHooks(d, dstIP, packetData)
-	}
-
-	// Track other protocols only if stateful mode is enabled
 	if m.stateful {
 		switch d.decoded[1] {
+		case layers.LayerTypeUDP:
+			m.trackUDPOutbound(d, srcIP, dstIP)
 		case layers.LayerTypeTCP:
 			m.trackTCPOutbound(d, srcIP, dstIP)
 		case layers.LayerTypeICMPv4:
@@ -298,6 +490,11 @@ func (m *Manager) processOutgoingHooks(packetData []byte) bool {
 		}
 	}
 
+	// Process UDP hooks even if stateful mode is disabled
+	if d.decoded[1] == layers.LayerTypeUDP {
+		return m.checkUDPHooks(d, dstIP, packetData)
+	}
+
 	return false
 }
 
@@ -379,10 +576,9 @@ func (m *Manager) trackICMPOutbound(d *decoder, srcIP, dstIP net.IP) {
 	}
 }
 
-// dropFilter implements filtering logic for incoming packets
+// dropFilter implements filtering logic for incoming packets.
-func (m *Manager) dropFilter(packetData []byte, rules map[string]RuleSet) bool {
+// If it returns true, the packet should be dropped.
-	// TODO: Disable router if --disable-server-router is set
+func (m *Manager) dropFilter(packetData []byte) bool {
-
 	m.mutex.RLock()
 	defer m.mutex.RUnlock()
 
@@ -390,25 +586,120 @@ func (m *Manager) dropFilter(packetData []byte, rules map[string]RuleSet) bool {
 	defer m.decoders.Put(d)
 
 	if !m.isValidPacket(d, packetData) {
+		m.logger.Trace("Invalid packet structure")
 		return true
 	}
 
 	srcIP, dstIP := m.extractIPs(d)
 	if srcIP == nil {
-		log.Errorf("unknown layer: %v", d.decoded[0])
+		m.logger.Error("Unknown network layer: %v", d.decoded[0])
 		return true
 	}
 
-	if !m.isWireguardTraffic(srcIP, dstIP) {
+	// For all inbound traffic, first check if it matches a tracked connection.
-		return false
+	// This must happen before any other filtering because the packets are statefully tracked.
-	}
-
-	// Check connection state only if enabled
 	if m.stateful && m.isValidTrackedConnection(d, srcIP, dstIP) {
 		return false
 	}
 
-	return m.applyRules(srcIP, packetData, rules, d)
+	if m.localipmanager.IsLocalIP(dstIP) {
+		return m.handleLocalTraffic(d, srcIP, dstIP, packetData)
+	}
+
+	return m.handleRoutedTraffic(d, srcIP, dstIP, packetData)
+}
+
+// handleLocalTraffic handles local traffic.
+// If it returns true, the packet should be dropped.
+func (m *Manager) handleLocalTraffic(d *decoder, srcIP, dstIP net.IP, packetData []byte) bool {
+	if !m.localForwarding {
+		m.logger.Trace("Dropping local packet (local forwarding disabled): src=%s dst=%s", srcIP, dstIP)
+		return true
+	}
+
+	if m.peerACLsBlock(srcIP, packetData, m.incomingRules, d) {
+		m.logger.Trace("Dropping local packet (ACL denied): src=%s dst=%s",
+			srcIP, dstIP)
+		return true
+	}
+
+	// if running in netstack mode we need to pass this to the forwarder
+	if m.netstack {
+		m.handleNetstackLocalTraffic(packetData)
+
+		// don't process this packet further
+		return true
+	}
+
+	return false
+}
+func (m *Manager) handleNetstackLocalTraffic(packetData []byte) {
+	if m.forwarder == nil {
+		return
+	}
+
+	if err := m.forwarder.InjectIncomingPacket(packetData); err != nil {
+		m.logger.Error("Failed to inject local packet: %v", err)
+	}
+}
+
+// handleRoutedTraffic handles routed traffic.
+// If it returns true, the packet should be dropped.
+func (m *Manager) handleRoutedTraffic(d *decoder, srcIP, dstIP net.IP, packetData []byte) bool {
+	// Drop if routing is disabled
+	if !m.routingEnabled {
+		m.logger.Trace("Dropping routed packet (routing disabled): src=%s dst=%s",
+			srcIP, dstIP)
+		return true
+	}
+
+	// Pass to native stack if native router is enabled or forced
+	if m.nativeRouter {
+		return false
+	}
+
+	// Get protocol and ports for route ACL check
+	proto := getProtocolFromPacket(d)
+	srcPort, dstPort := getPortsFromPacket(d)
+
+	// Check route ACLs
+	if !m.routeACLsPass(srcIP, dstIP, proto, srcPort, dstPort) {
+		m.logger.Trace("Dropping routed packet (ACL denied): src=%s:%d dst=%s:%d proto=%v",
+			srcIP, srcPort, dstIP, dstPort, proto)
+		return true
+	}
+
+	// Let forwarder handle the packet if it passed route ACLs
+	if err := m.forwarder.InjectIncomingPacket(packetData); err != nil {
+		m.logger.Error("Failed to inject incoming packet: %v", err)
+	}
+
+	// Forwarded packets shouldn't reach the native stack, hence they won't be visible in a packet capture
+	return true
+}
+
+func getProtocolFromPacket(d *decoder) firewall.Protocol {
+	switch d.decoded[1] {
+	case layers.LayerTypeTCP:
+		return firewall.ProtocolTCP
+	case layers.LayerTypeUDP:
+		return firewall.ProtocolUDP
+	case layers.LayerTypeICMPv4, layers.LayerTypeICMPv6:
+		return firewall.ProtocolICMP
+	default:
+		return firewall.ProtocolALL
+	}
+}
+
+func getPortsFromPacket(d *decoder) (srcPort, dstPort uint16) {
+	switch d.decoded[1] {
+	case layers.LayerTypeTCP:
+		return uint16(d.tcp.SrcPort), uint16(d.tcp.DstPort)
+	case layers.LayerTypeUDP:
+		return uint16(d.udp.SrcPort), uint16(d.udp.DstPort)
+	default:
+		return 0, 0
+	}
 }
 
 func (m *Manager) isValidPacket(d *decoder, packetData []byte) bool {
@@ -424,10 +715,6 @@ func (m *Manager) isValidPacket(d *decoder, packetData []byte) bool {
 	return true
 }
 
-func (m *Manager) isWireguardTraffic(srcIP, dstIP net.IP) bool {
-	return m.wgNetwork.Contains(srcIP) && m.wgNetwork.Contains(dstIP)
-}
-
 func (m *Manager) isValidTrackedConnection(d *decoder, srcIP, dstIP net.IP) bool {
 	switch d.decoded[1] {
 	case layers.LayerTypeTCP:
@@ -462,7 +749,22 @@ func (m *Manager) isValidTrackedConnection(d *decoder, srcIP, dstIP net.IP) bool
 	return false
 }
 
-func (m *Manager) applyRules(srcIP net.IP, packetData []byte, rules map[string]RuleSet, d *decoder) bool {
+// isSpecialICMP returns true if the packet is a special ICMP packet that should be allowed
+func (m *Manager) isSpecialICMP(d *decoder) bool {
+	if d.decoded[1] != layers.LayerTypeICMPv4 {
+		return false
+	}
+
+	icmpType := d.icmp4.TypeCode.Type()
+	return icmpType == layers.ICMPv4TypeDestinationUnreachable ||
+		icmpType == layers.ICMPv4TypeTimeExceeded
+}
+
+func (m *Manager) peerACLsBlock(srcIP net.IP, packetData []byte, rules map[string]RuleSet, d *decoder) bool {
+	if m.isSpecialICMP(d) {
+		return false
+	}
+
 	if filter, ok := validateRule(srcIP, packetData, rules[srcIP.String()], d); ok {
 		return filter
 	}
@@ -496,7 +798,7 @@ func portsMatch(rulePort *firewall.Port, packetPort uint16) bool {
 	return false
 }
 
-func validateRule(ip net.IP, packetData []byte, rules map[string]Rule, d *decoder) (bool, bool) {
+func validateRule(ip net.IP, packetData []byte, rules map[string]PeerRule, d *decoder) (bool, bool) {
 	payloadLayer := d.decoded[1]
 	for _, rule := range rules {
 		if rule.matchByIP && !ip.Equal(rule.ip) {
@@ -533,6 +835,51 @@ func validateRule(ip net.IP, packetData []byte, rules map[string]Rule, d *decode
 	return false, false
 }
 
+// routeACLsPass returns treu if the packet is allowed by the route ACLs
+func (m *Manager) routeACLsPass(srcIP, dstIP net.IP, proto firewall.Protocol, srcPort, dstPort uint16) bool {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
+
+	srcAddr := netip.AddrFrom4([4]byte(srcIP.To4()))
+	dstAddr := netip.AddrFrom4([4]byte(dstIP.To4()))
+
+	for _, rule := range m.routeRules {
+		if m.ruleMatches(rule, srcAddr, dstAddr, proto, srcPort, dstPort) {
+			return rule.action == firewall.ActionAccept
+		}
+	}
+	return false
+}
+
+func (m *Manager) ruleMatches(rule RouteRule, srcAddr, dstAddr netip.Addr, proto firewall.Protocol, srcPort, dstPort uint16) bool {
+	if !rule.destination.Contains(dstAddr) {
+		return false
+	}
+
+	sourceMatched := false
+	for _, src := range rule.sources {
+		if src.Contains(srcAddr) {
+			sourceMatched = true
+			break
+		}
+	}
+	if !sourceMatched {
+		return false
+	}
+
+	if rule.proto != firewall.ProtocolALL && rule.proto != proto {
+		return false
+	}
+
+	if proto == firewall.ProtocolTCP || proto == firewall.ProtocolUDP {
+		if !portsMatch(rule.srcPort, srcPort) || !portsMatch(rule.dstPort, dstPort) {
+			return false
+		}
+	}
+
+	return true
+}
+
 // SetNetwork of the wireguard interface to which filtering applied
 func (m *Manager) SetNetwork(network *net.IPNet) {
 	m.wgNetwork = network
@@ -544,7 +891,7 @@ func (m *Manager) SetNetwork(network *net.IPNet) {
 func (m *Manager) AddUDPPacketHook(
 	in bool, ip net.IP, dPort uint16, hook func([]byte) bool,
 ) string {
-	r := Rule{
+	r := PeerRule{
 		id:         uuid.New().String(),
 		ip:         ip,
 		protoLayer: layers.LayerTypeUDP,
@@ -561,12 +908,12 @@ func (m *Manager) AddUDPPacketHook(
 	m.mutex.Lock()
 	if in {
 		if _, ok := m.incomingRules[r.ip.String()]; !ok {
-			m.incomingRules[r.ip.String()] = make(map[string]Rule)
+			m.incomingRules[r.ip.String()] = make(map[string]PeerRule)
 		}
 		m.incomingRules[r.ip.String()][r.id] = r
 	} else {
 		if _, ok := m.outgoingRules[r.ip.String()]; !ok {
-			m.outgoingRules[r.ip.String()] = make(map[string]Rule)
+			m.outgoingRules[r.ip.String()] = make(map[string]PeerRule)
 		}
 		m.outgoingRules[r.ip.String()][r.id] = r
 	}
@@ -599,3 +946,10 @@ func (m *Manager) RemovePacketHook(hookID string) error {
 	}
 	return fmt.Errorf("hook with given id not found")
 }
+
+// SetLogLevel sets the log level for the firewall manager
+func (m *Manager) SetLogLevel(level log.Level) {
+	if m.logger != nil {
+		m.logger.SetLevel(nblog.Level(level))
+	}
+}

client/firewall/uspfilter/uspfilter_bench_test.go

@@ -1,9 +1,12 @@
+//go:build uspbench
+
 package uspfilter
 
 import (
 	"fmt"
 	"math/rand"
 	"net"
+	"net/netip"
 	"os"
 	"strings"
 	"testing"
@@ -155,7 +158,7 @@ func BenchmarkCoreFiltering(b *testing.B) {
 				// Create manager and basic setup
 				manager, _ := Create(&IFaceMock{
 					SetFilterFunc: func(device.PacketFilter) error { return nil },
-				})
+				}, false)
 				defer b.Cleanup(func() {
 					require.NoError(b, manager.Reset(nil))
 				})
@@ -185,7 +188,7 @@ func BenchmarkCoreFiltering(b *testing.B) {
 				// Measure inbound packet processing
 				b.ResetTimer()
 				for i := 0; i < b.N; i++ {
-					manager.dropFilter(inbound, manager.incomingRules)
+					manager.dropFilter(inbound)
 				}
 			})
 		}
@@ -200,7 +203,7 @@ func BenchmarkStateScaling(b *testing.B) {
 		b.Run(fmt.Sprintf("conns_%d", count), func(b *testing.B) {
 			manager, _ := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			})
+			}, false)
 			b.Cleanup(func() {
 				require.NoError(b, manager.Reset(nil))
 			})
@@ -228,7 +231,7 @@ func BenchmarkStateScaling(b *testing.B) {
 
 			b.ResetTimer()
 			for i := 0; i < b.N; i++ {
-				manager.dropFilter(testIn, manager.incomingRules)
+				manager.dropFilter(testIn)
 			}
 		})
 	}
@@ -248,7 +251,7 @@ func BenchmarkEstablishmentOverhead(b *testing.B) {
 		b.Run(sc.name, func(b *testing.B) {
 			manager, _ := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			})
+			}, false)
 			b.Cleanup(func() {
 				require.NoError(b, manager.Reset(nil))
 			})
@@ -269,7 +272,7 @@ func BenchmarkEstablishmentOverhead(b *testing.B) {
 
 			b.ResetTimer()
 			for i := 0; i < b.N; i++ {
-				manager.dropFilter(inbound, manager.incomingRules)
+				manager.dropFilter(inbound)
 			}
 		})
 	}
@@ -447,7 +450,7 @@ func BenchmarkRoutedNetworkReturn(b *testing.B) {
 		b.Run(sc.name, func(b *testing.B) {
 			manager, _ := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			})
+			}, false)
 			b.Cleanup(func() {
 				require.NoError(b, manager.Reset(nil))
 			})
@@ -472,7 +475,7 @@ func BenchmarkRoutedNetworkReturn(b *testing.B) {
 					manager.processOutgoingHooks(syn)
 					// SYN-ACK
 					synack := generateTCPPacketWithFlags(b, dstIP, srcIP, 80, 1024, uint16(conntrack.TCPSyn|conntrack.TCPAck))
-					manager.dropFilter(synack, manager.incomingRules)
+					manager.dropFilter(synack)
 					// ACK
 					ack := generateTCPPacketWithFlags(b, srcIP, dstIP, 1024, 80, uint16(conntrack.TCPAck))
 					manager.processOutgoingHooks(ack)
@@ -481,7 +484,7 @@ func BenchmarkRoutedNetworkReturn(b *testing.B) {
 
 			b.ResetTimer()
 			for i := 0; i < b.N; i++ {
-				manager.dropFilter(inbound, manager.incomingRules)
+				manager.dropFilter(inbound)
 			}
 		})
 	}
@@ -574,7 +577,7 @@ func BenchmarkLongLivedConnections(b *testing.B) {
 
 			manager, _ := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			})
+			}, false)
 			defer b.Cleanup(func() {
 				require.NoError(b, manager.Reset(nil))
 			})
@@ -618,7 +621,7 @@ func BenchmarkLongLivedConnections(b *testing.B) {
 				// SYN-ACK
 				synack := generateTCPPacketWithFlags(b, dstIPs[i], srcIPs[i],
 					80, uint16(1024+i), uint16(conntrack.TCPSyn|conntrack.TCPAck))
-				manager.dropFilter(synack, manager.incomingRules)
+				manager.dropFilter(synack)
 
 				// ACK
 				ack := generateTCPPacketWithFlags(b, srcIPs[i], dstIPs[i],
@@ -646,7 +649,7 @@ func BenchmarkLongLivedConnections(b *testing.B) {
 				// First outbound data
 				manager.processOutgoingHooks(outPackets[connIdx])
 				// Then inbound response - this is what we're actually measuring
-				manager.dropFilter(inPackets[connIdx], manager.incomingRules)
+				manager.dropFilter(inPackets[connIdx])
 			}
 		})
 	}
@@ -665,7 +668,7 @@ func BenchmarkShortLivedConnections(b *testing.B) {
 
 			manager, _ := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			})
+			}, false)
 			defer b.Cleanup(func() {
 				require.NoError(b, manager.Reset(nil))
 			})
@@ -754,17 +757,17 @@ func BenchmarkShortLivedConnections(b *testing.B) {
 
 				// Connection establishment
 				manager.processOutgoingHooks(p.syn)
-				manager.dropFilter(p.synAck, manager.incomingRules)
+				manager.dropFilter(p.synAck)
 				manager.processOutgoingHooks(p.ack)
 
 				// Data transfer
 				manager.processOutgoingHooks(p.request)
-				manager.dropFilter(p.response, manager.incomingRules)
+				manager.dropFilter(p.response)
 
 				// Connection teardown
 				manager.processOutgoingHooks(p.finClient)
-				manager.dropFilter(p.ackServer, manager.incomingRules)
+				manager.dropFilter(p.ackServer)
-				manager.dropFilter(p.finServer, manager.incomingRules)
+				manager.dropFilter(p.finServer)
 				manager.processOutgoingHooks(p.ackClient)
 			}
 		})
@@ -784,7 +787,7 @@ func BenchmarkParallelLongLivedConnections(b *testing.B) {
 
 			manager, _ := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			})
+			}, false)
 			defer b.Cleanup(func() {
 				require.NoError(b, manager.Reset(nil))
 			})
@@ -825,7 +828,7 @@ func BenchmarkParallelLongLivedConnections(b *testing.B) {
 
 				synack := generateTCPPacketWithFlags(b, dstIPs[i], srcIPs[i],
 					80, uint16(1024+i), uint16(conntrack.TCPSyn|conntrack.TCPAck))
-				manager.dropFilter(synack, manager.incomingRules)
+				manager.dropFilter(synack)
 
 				ack := generateTCPPacketWithFlags(b, srcIPs[i], dstIPs[i],
 					uint16(1024+i), 80, uint16(conntrack.TCPAck))
@@ -852,7 +855,7 @@ func BenchmarkParallelLongLivedConnections(b *testing.B) {
 
 					// Simulate bidirectional traffic
 					manager.processOutgoingHooks(outPackets[connIdx])
-					manager.dropFilter(inPackets[connIdx], manager.incomingRules)
+					manager.dropFilter(inPackets[connIdx])
 				}
 			})
 		})
@@ -872,7 +875,7 @@ func BenchmarkParallelShortLivedConnections(b *testing.B) {
 
 			manager, _ := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			})
+			}, false)
 			defer b.Cleanup(func() {
 				require.NoError(b, manager.Reset(nil))
 			})
@@ -949,15 +952,15 @@ func BenchmarkParallelShortLivedConnections(b *testing.B) {
 
 					// Full connection lifecycle
 					manager.processOutgoingHooks(p.syn)
-					manager.dropFilter(p.synAck, manager.incomingRules)
+					manager.dropFilter(p.synAck)
 					manager.processOutgoingHooks(p.ack)
 
 					manager.processOutgoingHooks(p.request)
-					manager.dropFilter(p.response, manager.incomingRules)
+					manager.dropFilter(p.response)
 
 					manager.processOutgoingHooks(p.finClient)
-					manager.dropFilter(p.ackServer, manager.incomingRules)
+					manager.dropFilter(p.ackServer)
-					manager.dropFilter(p.finServer, manager.incomingRules)
+					manager.dropFilter(p.finServer)
 					manager.processOutgoingHooks(p.ackClient)
 				}
 			})
@@ -996,3 +999,72 @@ func generateTCPPacketWithFlags(b *testing.B, srcIP, dstIP net.IP, srcPort, dstP
 	require.NoError(b, gopacket.SerializeLayers(buf, opts, ipv4, tcp, gopacket.Payload("test")))
 	return buf.Bytes()
 }
+
+func BenchmarkRouteACLs(b *testing.B) {
+	manager := setupRoutedManager(b, "10.10.0.100/16")
+
+	// Add several route rules to simulate real-world scenario
+	rules := []struct {
+		sources []netip.Prefix
+		dest    netip.Prefix
+		proto   fw.Protocol
+		port    *fw.Port
+	}{
+		{
+			sources: []netip.Prefix{netip.MustParsePrefix("100.10.0.0/16")},
+			dest:    netip.MustParsePrefix("192.168.1.0/24"),
+			proto:   fw.ProtocolTCP,
+			port:    &fw.Port{Values: []uint16{80, 443}},
+		},
+		{
+			sources: []netip.Prefix{
+				netip.MustParsePrefix("172.16.0.0/12"),
+				netip.MustParsePrefix("10.0.0.0/8"),
+			},
+			dest:  netip.MustParsePrefix("0.0.0.0/0"),
+			proto: fw.ProtocolICMP,
+		},
+		{
+			sources: []netip.Prefix{netip.MustParsePrefix("0.0.0.0/0")},
+			dest:    netip.MustParsePrefix("192.168.0.0/16"),
+			proto:   fw.ProtocolUDP,
+			port:    &fw.Port{Values: []uint16{53}},
+		},
+	}
+
+	for _, r := range rules {
+		_, err := manager.AddRouteFiltering(
+			r.sources,
+			r.dest,
+			r.proto,
+			nil,
+			r.port,
+			fw.ActionAccept,
+		)
+		if err != nil {
+			b.Fatal(err)
+		}
+	}
+
+	// Test cases that exercise different matching scenarios
+	cases := []struct {
+		srcIP   string
+		dstIP   string
+		proto   fw.Protocol
+		dstPort uint16
+	}{
+		{"100.10.0.1", "192.168.1.100", fw.ProtocolTCP, 443}, // Match first rule
+		{"172.16.0.1", "8.8.8.8", fw.ProtocolICMP, 0},        // Match second rule
+		{"1.1.1.1", "192.168.1.53", fw.ProtocolUDP, 53},      // Match third rule
+		{"192.168.1.1", "10.0.0.1", fw.ProtocolTCP, 8080},    // No match
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		for _, tc := range cases {
+			srcIP := net.ParseIP(tc.srcIP)
+			dstIP := net.ParseIP(tc.dstIP)
+			manager.routeACLsPass(srcIP, dstIP, tc.proto, 0, tc.dstPort)
+		}
+	}
+}

client/firewall/uspfilter/uspfilter_test.go

@@ -9,17 +9,38 @@ import (
 
 	"github.com/google/gopacket"
 	"github.com/google/gopacket/layers"
+	"github.com/sirupsen/logrus"
 	"github.com/stretchr/testify/require"
+	wgdevice "golang.zx2c4.com/wireguard/device"
 
 	fw "github.com/netbirdio/netbird/client/firewall/manager"
 	"github.com/netbirdio/netbird/client/firewall/uspfilter/conntrack"
+	"github.com/netbirdio/netbird/client/firewall/uspfilter/log"
 	"github.com/netbirdio/netbird/client/iface"
 	"github.com/netbirdio/netbird/client/iface/device"
 )
 
+var logger = log.NewFromLogrus(logrus.StandardLogger())
+
 type IFaceMock struct {
-	SetFilterFunc func(device.PacketFilter) error
+	SetFilterFunc   func(device.PacketFilter) error
-	AddressFunc   func() iface.WGAddress
+	AddressFunc     func() iface.WGAddress
+	GetWGDeviceFunc func() *wgdevice.Device
+	GetDeviceFunc   func() *device.FilteredDevice
+}
+
+func (i *IFaceMock) GetWGDevice() *wgdevice.Device {
+	if i.GetWGDeviceFunc == nil {
+		return nil
+	}
+	return i.GetWGDeviceFunc()
+}
+
+func (i *IFaceMock) GetDevice() *device.FilteredDevice {
+	if i.GetDeviceFunc == nil {
+		return nil
+	}
+	return i.GetDeviceFunc()
 }
 
 func (i *IFaceMock) SetFilter(iface device.PacketFilter) error {
@@ -41,7 +62,7 @@ func TestManagerCreate(t *testing.T) {
 		SetFilterFunc: func(device.PacketFilter) error { return nil },
 	}
 
-	m, err := Create(ifaceMock)
+	m, err := Create(ifaceMock, false)
 	if err != nil {
 		t.Errorf("failed to create Manager: %v", err)
 		return
@@ -61,7 +82,7 @@ func TestManagerAddPeerFiltering(t *testing.T) {
 		},
 	}
 
-	m, err := Create(ifaceMock)
+	m, err := Create(ifaceMock, false)
 	if err != nil {
 		t.Errorf("failed to create Manager: %v", err)
 		return
@@ -95,7 +116,7 @@ func TestManagerDeleteRule(t *testing.T) {
 		SetFilterFunc: func(device.PacketFilter) error { return nil },
 	}
 
-	m, err := Create(ifaceMock)
+	m, err := Create(ifaceMock, false)
 	if err != nil {
 		t.Errorf("failed to create Manager: %v", err)
 		return
@@ -166,12 +187,12 @@ func TestAddUDPPacketHook(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			manager, err := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			})
+			}, false)
 			require.NoError(t, err)
 
 			manager.AddUDPPacketHook(tt.in, tt.ip, tt.dPort, tt.hook)
 
-			var addedRule Rule
+			var addedRule PeerRule
 			if tt.in {
 				if len(manager.incomingRules[tt.ip.String()]) != 1 {
 					t.Errorf("expected 1 incoming rule, got %d", len(manager.incomingRules))
@@ -215,7 +236,7 @@ func TestManagerReset(t *testing.T) {
 		SetFilterFunc: func(device.PacketFilter) error { return nil },
 	}
 
-	m, err := Create(ifaceMock)
+	m, err := Create(ifaceMock, false)
 	if err != nil {
 		t.Errorf("failed to create Manager: %v", err)
 		return
@@ -247,9 +268,18 @@ func TestManagerReset(t *testing.T) {
 func TestNotMatchByIP(t *testing.T) {
 	ifaceMock := &IFaceMock{
 		SetFilterFunc: func(device.PacketFilter) error { return nil },
+		AddressFunc: func() iface.WGAddress {
+			return iface.WGAddress{
+				IP: net.ParseIP("100.10.0.100"),
+				Network: &net.IPNet{
+					IP:   net.ParseIP("100.10.0.0"),
+					Mask: net.CIDRMask(16, 32),
+				},
+			}
+		},
 	}
 
-	m, err := Create(ifaceMock)
+	m, err := Create(ifaceMock, false)
 	if err != nil {
 		t.Errorf("failed to create Manager: %v", err)
 		return
@@ -298,7 +328,7 @@ func TestNotMatchByIP(t *testing.T) {
 		return
 	}
 
-	if m.dropFilter(buf.Bytes(), m.incomingRules) {
+	if m.dropFilter(buf.Bytes()) {
 		t.Errorf("expected packet to be accepted")
 		return
 	}
@@ -317,7 +347,7 @@ func TestRemovePacketHook(t *testing.T) {
 	}
 
 	// creating manager instance
-	manager, err := Create(iface)
+	manager, err := Create(iface, false)
 	if err != nil {
 		t.Fatalf("Failed to create Manager: %s", err)
 	}
@@ -363,7 +393,7 @@ func TestRemovePacketHook(t *testing.T) {
 func TestProcessOutgoingHooks(t *testing.T) {
 	manager, err := Create(&IFaceMock{
 		SetFilterFunc: func(device.PacketFilter) error { return nil },
-	})
+	}, false)
 	require.NoError(t, err)
 
 	manager.wgNetwork = &net.IPNet{
@@ -371,7 +401,7 @@ func TestProcessOutgoingHooks(t *testing.T) {
 		Mask: net.CIDRMask(16, 32),
 	}
 	manager.udpTracker.Close()
-	manager.udpTracker = conntrack.NewUDPTracker(100 * time.Millisecond)
+	manager.udpTracker = conntrack.NewUDPTracker(100*time.Millisecond, logger)
 	defer func() {
 		require.NoError(t, manager.Reset(nil))
 	}()
@@ -449,7 +479,7 @@ func TestUSPFilterCreatePerformance(t *testing.T) {
 			ifaceMock := &IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
 			}
-			manager, err := Create(ifaceMock)
+			manager, err := Create(ifaceMock, false)
 			require.NoError(t, err)
 			time.Sleep(time.Second)
 
@@ -476,7 +506,7 @@ func TestUSPFilterCreatePerformance(t *testing.T) {
 func TestStatefulFirewall_UDPTracking(t *testing.T) {
 	manager, err := Create(&IFaceMock{
 		SetFilterFunc: func(device.PacketFilter) error { return nil },
-	})
+	}, false)
 	require.NoError(t, err)
 
 	manager.wgNetwork = &net.IPNet{
@@ -485,7 +515,7 @@ func TestStatefulFirewall_UDPTracking(t *testing.T) {
 	}
 
 	manager.udpTracker.Close() // Close the existing tracker
-	manager.udpTracker = conntrack.NewUDPTracker(200 * time.Millisecond)
+	manager.udpTracker = conntrack.NewUDPTracker(200*time.Millisecond, logger)
 	manager.decoders = sync.Pool{
 		New: func() any {
 			d := &decoder{
@@ -606,7 +636,7 @@ func TestStatefulFirewall_UDPTracking(t *testing.T) {
 	for _, cp := range checkPoints {
 		time.Sleep(cp.sleep)
 
-		drop = manager.dropFilter(inboundBuf.Bytes(), manager.incomingRules)
+		drop = manager.dropFilter(inboundBuf.Bytes())
 		require.Equal(t, cp.shouldAllow, !drop, cp.description)
 
 		// If the connection should still be valid, verify it exists
@@ -677,7 +707,7 @@ func TestStatefulFirewall_UDPTracking(t *testing.T) {
 			require.NoError(t, err)
 
 			// Verify the invalid packet is dropped
-			drop = manager.dropFilter(testBuf.Bytes(), manager.incomingRules)
+			drop = manager.dropFilter(testBuf.Bytes())
 			require.True(t, drop, tc.description)
 		})
 	}

client/iface/device.go

@@ -3,6 +3,8 @@
 package iface
 
 import (
+	wgdevice "golang.zx2c4.com/wireguard/device"
+
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/device"
 )
@@ -15,4 +17,5 @@ type WGTunDevice interface {
 	DeviceName() string
 	Close() error
 	FilteredDevice() *device.FilteredDevice
+	Device() *wgdevice.Device
 }

client/iface/device/device_darwin.go

@@ -117,6 +117,11 @@ func (t *TunDevice) FilteredDevice() *FilteredDevice {
 	return t.filteredDevice
 }
 
+// Device returns the wireguard device
+func (t *TunDevice) Device() *device.Device {
+	return t.device
+}
+
 // assignAddr Adds IP address to the tunnel interface and network route based on the range provided
 func (t *TunDevice) assignAddr() error {
 	cmd := exec.Command("ifconfig", t.name, "inet", t.address.IP.String(), t.address.IP.String())

client/iface/device/device_kernel_unix.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/pion/transport/v3"
 	log "github.com/sirupsen/logrus"
+	"golang.zx2c4.com/wireguard/device"
 
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
@@ -151,6 +152,11 @@ func (t *TunKernelDevice) DeviceName() string {
 	return t.name
 }
 
+// Device returns the wireguard device, not applicable for kernel devices
+func (t *TunKernelDevice) Device() *device.Device {
+	return nil
+}
+
 func (t *TunKernelDevice) FilteredDevice() *FilteredDevice {
 	return nil
 }

client/iface/device/device_netstack.go

@@ -117,3 +117,8 @@ func (t *TunNetstackDevice) DeviceName() string {
 func (t *TunNetstackDevice) FilteredDevice() *FilteredDevice {
 	return t.filteredDevice
 }
+
+// Device returns the wireguard device
+func (t *TunNetstackDevice) Device() *device.Device {
+	return t.device
+}

client/iface/device/device_usp_unix.go

@@ -124,6 +124,11 @@ func (t *USPDevice) FilteredDevice() *FilteredDevice {
 	return t.filteredDevice
 }
 
+// Device returns the wireguard device
+func (t *USPDevice) Device() *device.Device {
+	return t.device
+}
+
 // assignAddr Adds IP address to the tunnel interface
 func (t *USPDevice) assignAddr() error {
 	link := newWGLink(t.name)

client/iface/device/device_windows.go

@@ -150,6 +150,11 @@ func (t *TunDevice) FilteredDevice() *FilteredDevice {
 	return t.filteredDevice
 }
 
+// Device returns the wireguard device
+func (t *TunDevice) Device() *device.Device {
+	return t.device
+}
+
 func (t *TunDevice) GetInterfaceGUIDString() (string, error) {
 	if t.nativeTunDevice == nil {
 		return "", fmt.Errorf("interface has not been initialized yet")

client/iface/device_android.go

@@ -1,6 +1,8 @@
 package iface
 
 import (
+	wgdevice "golang.zx2c4.com/wireguard/device"
+
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/device"
 )
@@ -13,4 +15,5 @@ type WGTunDevice interface {
 	DeviceName() string
 	Close() error
 	FilteredDevice() *device.FilteredDevice
+	Device() *wgdevice.Device
 }

client/iface/iface.go

@@ -11,6 +11,8 @@ import (
 	log "github.com/sirupsen/logrus"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 
+	wgdevice "golang.zx2c4.com/wireguard/device"
+
 	"github.com/netbirdio/netbird/client/errors"
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
@@ -203,6 +205,11 @@ func (w *WGIface) GetDevice() *device.FilteredDevice {
 	return w.tun.FilteredDevice()
 }
 
+// GetWGDevice returns the WireGuard device
+func (w *WGIface) GetWGDevice() *wgdevice.Device {
+	return w.tun.Device()
+}
+
 // GetStats returns the last handshake time, rx and tx bytes for the given peer
 func (w *WGIface) GetStats(peerKey string) (configurer.WGStats, error) {
 	return w.configurer.GetStats(peerKey)

client/iface/iface_moc.go

@@ -4,6 +4,7 @@ import (
 	"net"
 	"time"
 
+	wgdevice "golang.zx2c4.com/wireguard/device"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 
 	"github.com/netbirdio/netbird/client/iface/bind"
@@ -29,6 +30,7 @@ type MockWGIface struct {
 	SetFilterFunc              func(filter device.PacketFilter) error
 	GetFilterFunc              func() device.PacketFilter
 	GetDeviceFunc              func() *device.FilteredDevice
+	GetWGDeviceFunc            func() *wgdevice.Device
 	GetStatsFunc               func(peerKey string) (configurer.WGStats, error)
 	GetInterfaceGUIDStringFunc func() (string, error)
 	GetProxyFunc               func() wgproxy.Proxy
@@ -102,11 +104,14 @@ func (m *MockWGIface) GetDevice() *device.FilteredDevice {
 	return m.GetDeviceFunc()
 }
 
+func (m *MockWGIface) GetWGDevice() *wgdevice.Device {
+	return m.GetWGDeviceFunc()
+}
+
 func (m *MockWGIface) GetStats(peerKey string) (configurer.WGStats, error) {
 	return m.GetStatsFunc(peerKey)
 }
 
 func (m *MockWGIface) GetProxy() wgproxy.Proxy {
-	//TODO implement me
+	return m.GetProxyFunc()
-	panic("implement me")
 }

client/iface/iwginterface.go

@@ -6,6 +6,7 @@ import (
 	"net"
 	"time"
 
+	wgdevice "golang.zx2c4.com/wireguard/device"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 
 	"github.com/netbirdio/netbird/client/iface/bind"
@@ -32,5 +33,6 @@ type IWGIface interface {
 	SetFilter(filter device.PacketFilter) error
 	GetFilter() device.PacketFilter
 	GetDevice() *device.FilteredDevice
+	GetWGDevice() *wgdevice.Device
 	GetStats(peerKey string) (configurer.WGStats, error)
 }

client/iface/iwginterface_windows.go

@@ -4,6 +4,7 @@ import (
 	"net"
 	"time"
 
+	wgdevice "golang.zx2c4.com/wireguard/device"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 
 	"github.com/netbirdio/netbird/client/iface/bind"
@@ -30,6 +31,7 @@ type IWGIface interface {
 	SetFilter(filter device.PacketFilter) error
 	GetFilter() device.PacketFilter
 	GetDevice() *device.FilteredDevice
+	GetWGDevice() *wgdevice.Device
 	GetStats(peerKey string) (configurer.WGStats, error)
 	GetInterfaceGUIDString() (string, error)
 }

client/internal/acl/manager_test.go

@@ -49,9 +49,10 @@ func TestDefaultManager(t *testing.T) {
 		IP:      ip,
 		Network: network,
 	}).AnyTimes()
+	ifaceMock.EXPECT().GetWGDevice().Return(nil).AnyTimes()
 
 	// we receive one rule from the management so for testing purposes ignore it
-	fw, err := firewall.NewFirewall(ifaceMock, nil)
+	fw, err := firewall.NewFirewall(ifaceMock, nil, false)
 	if err != nil {
 		t.Errorf("create firewall: %v", err)
 		return
@@ -342,9 +343,10 @@ func TestDefaultManagerEnableSSHRules(t *testing.T) {
 		IP:      ip,
 		Network: network,
 	}).AnyTimes()
+	ifaceMock.EXPECT().GetWGDevice().Return(nil).AnyTimes()
 
 	// we receive one rule from the management so for testing purposes ignore it
-	fw, err := firewall.NewFirewall(ifaceMock, nil)
+	fw, err := firewall.NewFirewall(ifaceMock, nil, false)
 	if err != nil {
 		t.Errorf("create firewall: %v", err)
 		return

client/internal/acl/mocks/iface_mapper.go

@@ -8,6 +8,8 @@ import (
 	reflect "reflect"
 
 	gomock "github.com/golang/mock/gomock"
+	wgdevice "golang.zx2c4.com/wireguard/device"
+
 	iface "github.com/netbirdio/netbird/client/iface"
 	"github.com/netbirdio/netbird/client/iface/device"
 )
@@ -90,3 +92,31 @@ func (mr *MockIFaceMapperMockRecorder) SetFilter(arg0 interface{}) *gomock.Call
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SetFilter", reflect.TypeOf((*MockIFaceMapper)(nil).SetFilter), arg0)
 }
+
+// GetDevice mocks base method.
+func (m *MockIFaceMapper) GetDevice() *device.FilteredDevice {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "GetDevice")
+	ret0, _ := ret[0].(*device.FilteredDevice)
+	return ret0
+}
+
+// GetDevice indicates an expected call of GetDevice.
+func (mr *MockIFaceMapperMockRecorder) GetDevice() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetDevice", reflect.TypeOf((*MockIFaceMapper)(nil).GetDevice))
+}
+
+// GetWGDevice mocks base method.
+func (m *MockIFaceMapper) GetWGDevice() *wgdevice.Device {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "GetWGDevice")
+	ret0, _ := ret[0].(*wgdevice.Device)
+	return ret0
+}
+
+// GetWGDevice indicates an expected call of GetWGDevice.
+func (mr *MockIFaceMapperMockRecorder) GetWGDevice() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetWGDevice", reflect.TypeOf((*MockIFaceMapper)(nil).GetWGDevice))
+}

client/internal/dns/server_test.go

@@ -849,7 +849,7 @@ func createWgInterfaceWithBind(t *testing.T) (*iface.WGIface, error) {
 		return nil, err
 	}
 
-	pf, err := uspfilter.Create(wgIface)
+	pf, err := uspfilter.Create(wgIface, false)
 	if err != nil {
 		t.Fatalf("failed to create uspfilter: %v", err)
 		return nil, err

client/internal/engine.go

@@ -42,13 +42,13 @@ import (
 	"github.com/netbirdio/netbird/client/internal/routemanager"
 	"github.com/netbirdio/netbird/client/internal/routemanager/systemops"
 	"github.com/netbirdio/netbird/client/internal/statemanager"
+	"github.com/netbirdio/netbird/management/domain"
 	semaphoregroup "github.com/netbirdio/netbird/util/semaphore-group"
 
 	nbssh "github.com/netbirdio/netbird/client/ssh"
 	"github.com/netbirdio/netbird/client/system"
 	nbdns "github.com/netbirdio/netbird/dns"
 	mgm "github.com/netbirdio/netbird/management/client"
-	"github.com/netbirdio/netbird/management/domain"
 	mgmProto "github.com/netbirdio/netbird/management/proto"
 	auth "github.com/netbirdio/netbird/relay/auth/hmac"
 	relayClient "github.com/netbirdio/netbird/relay/client"
@@ -193,6 +193,10 @@ type Peer struct {
 	WgAllowedIps string
 }
 
+type localIpUpdater interface {
+	UpdateLocalIPs() error
+}
+
 // NewEngine creates a new Connection Engine with probes attached
 func NewEngine(
 	clientCtx context.Context,
@@ -433,7 +437,7 @@ func (e *Engine) createFirewall() error {
 	}
 
 	var err error
-	e.firewall, err = firewall.NewFirewall(e.wgInterface, e.stateManager)
+	e.firewall, err = firewall.NewFirewall(e.wgInterface, e.stateManager, e.config.DisableServerRoutes)
 	if err != nil || e.firewall == nil {
 		log.Errorf("failed creating firewall manager: %s", err)
 		return nil
@@ -883,6 +887,14 @@ func (e *Engine) updateNetworkMap(networkMap *mgmProto.NetworkMap) error {
 		e.acl.ApplyFiltering(networkMap)
 	}
 
+	if e.firewall != nil {
+		if localipfw, ok := e.firewall.(localIpUpdater); ok {
+			if err := localipfw.UpdateLocalIPs(); err != nil {
+				log.Errorf("failed to update local IPs: %v", err)
+			}
+		}
+	}
+
 	// DNS forwarder
 	dnsRouteFeatureFlag := toDNSFeatureFlag(networkMap)
 	dnsRouteDomains := toRouteDomains(e.config.WgPrivateKey.PublicKey().String(), networkMap.GetRoutes())
@@ -1446,6 +1458,11 @@ func (e *Engine) GetRouteManager() routemanager.Manager {
 	return e.routeManager
 }
 
+// GetFirewallManager returns the firewall manager
+func (e *Engine) GetFirewallManager() manager.Manager {
+	return e.firewall
+}
+
 func findIPFromInterfaceName(ifaceName string) (net.IP, error) {
 	iface, err := net.InterfaceByName(ifaceName)
 	if err != nil {
@@ -1657,6 +1674,14 @@ func (e *Engine) GetLatestNetworkMap() (*mgmProto.NetworkMap, error) {
 	return nm, nil
 }
 
+// GetWgAddr returns the wireguard address
+func (e *Engine) GetWgAddr() net.IP {
+	if e.wgInterface == nil {
+		return nil
+	}
+	return e.wgInterface.Address().IP
+}
+
 // updateDNSForwarder start or stop the DNS forwarder based on the domains and the feature flag
 func (e *Engine) updateDNSForwarder(enabled bool, domains []string) {
 	if !enabled {

client/internal/routemanager/manager.go

@@ -422,11 +422,6 @@ func (m *DefaultManager) classifyRoutes(newRoutes []*route.Route) (map[route.ID]
 		haID := newRoute.GetHAUniqueID()
 		if newRoute.Peer == m.pubKey {
 			ownNetworkIDs[haID] = true
-			// only linux is supported for now
-			if runtime.GOOS != "linux" {
-				log.Warnf("received a route to manage, but agent doesn't support router mode on %s OS", runtime.GOOS)
-				continue
-			}
 			newServerRoutesMap[newRoute.ID] = newRoute
 		}
 	}

client/proto/daemon.pb.go

@@ -2571,6 +2571,330 @@ func (*SetNetworkMapPersistenceResponse) Descriptor() ([]byte, []int) {
 	return file_daemon_proto_rawDescGZIP(), []int{39}
 }
 
+type TCPFlags struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Syn bool `protobuf:"varint,1,opt,name=syn,proto3" json:"syn,omitempty"`
+	Ack bool `protobuf:"varint,2,opt,name=ack,proto3" json:"ack,omitempty"`
+	Fin bool `protobuf:"varint,3,opt,name=fin,proto3" json:"fin,omitempty"`
+	Rst bool `protobuf:"varint,4,opt,name=rst,proto3" json:"rst,omitempty"`
+	Psh bool `protobuf:"varint,5,opt,name=psh,proto3" json:"psh,omitempty"`
+	Urg bool `protobuf:"varint,6,opt,name=urg,proto3" json:"urg,omitempty"`
+}
+
+func (x *TCPFlags) Reset() {
+	*x = TCPFlags{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_daemon_proto_msgTypes[40]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *TCPFlags) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*TCPFlags) ProtoMessage() {}
+
+func (x *TCPFlags) ProtoReflect() protoreflect.Message {
+	mi := &file_daemon_proto_msgTypes[40]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use TCPFlags.ProtoReflect.Descriptor instead.
+func (*TCPFlags) Descriptor() ([]byte, []int) {
+	return file_daemon_proto_rawDescGZIP(), []int{40}
+}
+
+func (x *TCPFlags) GetSyn() bool {
+	if x != nil {
+		return x.Syn
+	}
+	return false
+}
+
+func (x *TCPFlags) GetAck() bool {
+	if x != nil {
+		return x.Ack
+	}
+	return false
+}
+
+func (x *TCPFlags) GetFin() bool {
+	if x != nil {
+		return x.Fin
+	}
+	return false
+}
+
+func (x *TCPFlags) GetRst() bool {
+	if x != nil {
+		return x.Rst
+	}
+	return false
+}
+
+func (x *TCPFlags) GetPsh() bool {
+	if x != nil {
+		return x.Psh
+	}
+	return false
+}
+
+func (x *TCPFlags) GetUrg() bool {
+	if x != nil {
+		return x.Urg
+	}
+	return false
+}
+
+type TracePacketRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	SourceIp        string    `protobuf:"bytes,1,opt,name=source_ip,json=sourceIp,proto3" json:"source_ip,omitempty"`
+	DestinationIp   string    `protobuf:"bytes,2,opt,name=destination_ip,json=destinationIp,proto3" json:"destination_ip,omitempty"`
+	Protocol        string    `protobuf:"bytes,3,opt,name=protocol,proto3" json:"protocol,omitempty"`
+	SourcePort      uint32    `protobuf:"varint,4,opt,name=source_port,json=sourcePort,proto3" json:"source_port,omitempty"`
+	DestinationPort uint32    `protobuf:"varint,5,opt,name=destination_port,json=destinationPort,proto3" json:"destination_port,omitempty"`
+	Direction       string    `protobuf:"bytes,6,opt,name=direction,proto3" json:"direction,omitempty"`
+	TcpFlags        *TCPFlags `protobuf:"bytes,7,opt,name=tcp_flags,json=tcpFlags,proto3,oneof" json:"tcp_flags,omitempty"`
+	IcmpType        *uint32   `protobuf:"varint,8,opt,name=icmp_type,json=icmpType,proto3,oneof" json:"icmp_type,omitempty"`
+	IcmpCode        *uint32   `protobuf:"varint,9,opt,name=icmp_code,json=icmpCode,proto3,oneof" json:"icmp_code,omitempty"`
+}
+
+func (x *TracePacketRequest) Reset() {
+	*x = TracePacketRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_daemon_proto_msgTypes[41]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *TracePacketRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*TracePacketRequest) ProtoMessage() {}
+
+func (x *TracePacketRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_daemon_proto_msgTypes[41]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use TracePacketRequest.ProtoReflect.Descriptor instead.
+func (*TracePacketRequest) Descriptor() ([]byte, []int) {
+	return file_daemon_proto_rawDescGZIP(), []int{41}
+}
+
+func (x *TracePacketRequest) GetSourceIp() string {
+	if x != nil {
+		return x.SourceIp
+	}
+	return ""
+}
+
+func (x *TracePacketRequest) GetDestinationIp() string {
+	if x != nil {
+		return x.DestinationIp
+	}
+	return ""
+}
+
+func (x *TracePacketRequest) GetProtocol() string {
+	if x != nil {
+		return x.Protocol
+	}
+	return ""
+}
+
+func (x *TracePacketRequest) GetSourcePort() uint32 {
+	if x != nil {
+		return x.SourcePort
+	}
+	return 0
+}
+
+func (x *TracePacketRequest) GetDestinationPort() uint32 {
+	if x != nil {
+		return x.DestinationPort
+	}
+	return 0
+}
+
+func (x *TracePacketRequest) GetDirection() string {
+	if x != nil {
+		return x.Direction
+	}
+	return ""
+}
+
+func (x *TracePacketRequest) GetTcpFlags() *TCPFlags {
+	if x != nil {
+		return x.TcpFlags
+	}
+	return nil
+}
+
+func (x *TracePacketRequest) GetIcmpType() uint32 {
+	if x != nil && x.IcmpType != nil {
+		return *x.IcmpType
+	}
+	return 0
+}
+
+func (x *TracePacketRequest) GetIcmpCode() uint32 {
+	if x != nil && x.IcmpCode != nil {
+		return *x.IcmpCode
+	}
+	return 0
+}
+
+type TraceStage struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name              string  `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Message           string  `protobuf:"bytes,2,opt,name=message,proto3" json:"message,omitempty"`
+	Allowed           bool    `protobuf:"varint,3,opt,name=allowed,proto3" json:"allowed,omitempty"`
+	ForwardingDetails *string `protobuf:"bytes,4,opt,name=forwarding_details,json=forwardingDetails,proto3,oneof" json:"forwarding_details,omitempty"`
+}
+
+func (x *TraceStage) Reset() {
+	*x = TraceStage{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_daemon_proto_msgTypes[42]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *TraceStage) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*TraceStage) ProtoMessage() {}
+
+func (x *TraceStage) ProtoReflect() protoreflect.Message {
+	mi := &file_daemon_proto_msgTypes[42]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use TraceStage.ProtoReflect.Descriptor instead.
+func (*TraceStage) Descriptor() ([]byte, []int) {
+	return file_daemon_proto_rawDescGZIP(), []int{42}
+}
+
+func (x *TraceStage) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *TraceStage) GetMessage() string {
+	if x != nil {
+		return x.Message
+	}
+	return ""
+}
+
+func (x *TraceStage) GetAllowed() bool {
+	if x != nil {
+		return x.Allowed
+	}
+	return false
+}
+
+func (x *TraceStage) GetForwardingDetails() string {
+	if x != nil && x.ForwardingDetails != nil {
+		return *x.ForwardingDetails
+	}
+	return ""
+}
+
+type TracePacketResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Stages           []*TraceStage `protobuf:"bytes,1,rep,name=stages,proto3" json:"stages,omitempty"`
+	FinalDisposition bool          `protobuf:"varint,2,opt,name=final_disposition,json=finalDisposition,proto3" json:"final_disposition,omitempty"`
+}
+
+func (x *TracePacketResponse) Reset() {
+	*x = TracePacketResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_daemon_proto_msgTypes[43]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *TracePacketResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*TracePacketResponse) ProtoMessage() {}
+
+func (x *TracePacketResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_daemon_proto_msgTypes[43]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use TracePacketResponse.ProtoReflect.Descriptor instead.
+func (*TracePacketResponse) Descriptor() ([]byte, []int) {
+	return file_daemon_proto_rawDescGZIP(), []int{43}
+}
+
+func (x *TracePacketResponse) GetStages() []*TraceStage {
+	if x != nil {
+		return x.Stages
+	}
+	return nil
+}
+
+func (x *TracePacketResponse) GetFinalDisposition() bool {
+	if x != nil {
+		return x.FinalDisposition
+	}
+	return false
+}
+
 var File_daemon_proto protoreflect.FileDescriptor
 
 var file_daemon_proto_rawDesc = []byte{
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 }
 
 var (
@@ -3016,7 +3394,7 @@ func file_daemon_proto_rawDescGZIP() []byte {
 }
 
 var file_daemon_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_daemon_proto_msgTypes = make([]protoimpl.MessageInfo, 41)
+var file_daemon_proto_msgTypes = make([]protoimpl.MessageInfo, 45)
 var file_daemon_proto_goTypes = []interface{}{
 	(LogLevel)(0),                            // 0: daemon.LogLevel
 	(*LoginRequest)(nil),                     // 1: daemon.LoginRequest
@@ -3059,16 +3437,20 @@ var file_daemon_proto_goTypes = []interface{}{
 	(*DeleteStateResponse)(nil),              // 38: daemon.DeleteStateResponse
 	(*SetNetworkMapPersistenceRequest)(nil),  // 39: daemon.SetNetworkMapPersistenceRequest
 	(*SetNetworkMapPersistenceResponse)(nil), // 40: daemon.SetNetworkMapPersistenceResponse
-	nil,                                      // 41: daemon.Network.ResolvedIPsEntry
+	(*TCPFlags)(nil),                         // 41: daemon.TCPFlags
-	(*durationpb.Duration)(nil),              // 42: google.protobuf.Duration
+	(*TracePacketRequest)(nil),               // 42: daemon.TracePacketRequest
-	(*timestamppb.Timestamp)(nil),            // 43: google.protobuf.Timestamp
+	(*TraceStage)(nil),                       // 43: daemon.TraceStage
+	(*TracePacketResponse)(nil),              // 44: daemon.TracePacketResponse
+	nil,                                      // 45: daemon.Network.ResolvedIPsEntry
+	(*durationpb.Duration)(nil),              // 46: google.protobuf.Duration
+	(*timestamppb.Timestamp)(nil),            // 47: google.protobuf.Timestamp
 }
 var file_daemon_proto_depIdxs = []int32{
-	42, // 0: daemon.LoginRequest.dnsRouteInterval:type_name -> google.protobuf.Duration
+	46, // 0: daemon.LoginRequest.dnsRouteInterval:type_name -> google.protobuf.Duration
 	19, // 1: daemon.StatusResponse.fullStatus:type_name -> daemon.FullStatus
-	43, // 2: daemon.PeerState.connStatusUpdate:type_name -> google.protobuf.Timestamp
+	47, // 2: daemon.PeerState.connStatusUpdate:type_name -> google.protobuf.Timestamp
-	43, // 3: daemon.PeerState.lastWireguardHandshake:type_name -> google.protobuf.Timestamp
+	47, // 3: daemon.PeerState.lastWireguardHandshake:type_name -> google.protobuf.Timestamp
-	42, // 4: daemon.PeerState.latency:type_name -> google.protobuf.Duration
+	46, // 4: daemon.PeerState.latency:type_name -> google.protobuf.Duration
 	16, // 5: daemon.FullStatus.managementState:type_name -> daemon.ManagementState
 	15, // 6: daemon.FullStatus.signalState:type_name -> daemon.SignalState
 	14, // 7: daemon.FullStatus.localPeerState:type_name -> daemon.LocalPeerState
@@ -3076,48 +3458,52 @@ var file_daemon_proto_depIdxs = []int32{
 	17, // 9: daemon.FullStatus.relays:type_name -> daemon.RelayState
 	18, // 10: daemon.FullStatus.dns_servers:type_name -> daemon.NSGroupState
 	25, // 11: daemon.ListNetworksResponse.routes:type_name -> daemon.Network
-	41, // 12: daemon.Network.resolvedIPs:type_name -> daemon.Network.ResolvedIPsEntry
+	45, // 12: daemon.Network.resolvedIPs:type_name -> daemon.Network.ResolvedIPsEntry
 	0,  // 13: daemon.GetLogLevelResponse.level:type_name -> daemon.LogLevel
 	0,  // 14: daemon.SetLogLevelRequest.level:type_name -> daemon.LogLevel
 	32, // 15: daemon.ListStatesResponse.states:type_name -> daemon.State
-	24, // 16: daemon.Network.ResolvedIPsEntry.value:type_name -> daemon.IPList
+	41, // 16: daemon.TracePacketRequest.tcp_flags:type_name -> daemon.TCPFlags
-	1,  // 17: daemon.DaemonService.Login:input_type -> daemon.LoginRequest
+	43, // 17: daemon.TracePacketResponse.stages:type_name -> daemon.TraceStage
-	3,  // 18: daemon.DaemonService.WaitSSOLogin:input_type -> daemon.WaitSSOLoginRequest
+	24, // 18: daemon.Network.ResolvedIPsEntry.value:type_name -> daemon.IPList
-	5,  // 19: daemon.DaemonService.Up:input_type -> daemon.UpRequest
+	1,  // 19: daemon.DaemonService.Login:input_type -> daemon.LoginRequest
-	7,  // 20: daemon.DaemonService.Status:input_type -> daemon.StatusRequest
+	3,  // 20: daemon.DaemonService.WaitSSOLogin:input_type -> daemon.WaitSSOLoginRequest
-	9,  // 21: daemon.DaemonService.Down:input_type -> daemon.DownRequest
+	5,  // 21: daemon.DaemonService.Up:input_type -> daemon.UpRequest
-	11, // 22: daemon.DaemonService.GetConfig:input_type -> daemon.GetConfigRequest
+	7,  // 22: daemon.DaemonService.Status:input_type -> daemon.StatusRequest
-	20, // 23: daemon.DaemonService.ListNetworks:input_type -> daemon.ListNetworksRequest
+	9,  // 23: daemon.DaemonService.Down:input_type -> daemon.DownRequest
-	22, // 24: daemon.DaemonService.SelectNetworks:input_type -> daemon.SelectNetworksRequest
+	11, // 24: daemon.DaemonService.GetConfig:input_type -> daemon.GetConfigRequest
-	22, // 25: daemon.DaemonService.DeselectNetworks:input_type -> daemon.SelectNetworksRequest
+	20, // 25: daemon.DaemonService.ListNetworks:input_type -> daemon.ListNetworksRequest
-	26, // 26: daemon.DaemonService.DebugBundle:input_type -> daemon.DebugBundleRequest
+	22, // 26: daemon.DaemonService.SelectNetworks:input_type -> daemon.SelectNetworksRequest
-	28, // 27: daemon.DaemonService.GetLogLevel:input_type -> daemon.GetLogLevelRequest
+	22, // 27: daemon.DaemonService.DeselectNetworks:input_type -> daemon.SelectNetworksRequest
-	30, // 28: daemon.DaemonService.SetLogLevel:input_type -> daemon.SetLogLevelRequest
+	26, // 28: daemon.DaemonService.DebugBundle:input_type -> daemon.DebugBundleRequest
-	33, // 29: daemon.DaemonService.ListStates:input_type -> daemon.ListStatesRequest
+	28, // 29: daemon.DaemonService.GetLogLevel:input_type -> daemon.GetLogLevelRequest
-	35, // 30: daemon.DaemonService.CleanState:input_type -> daemon.CleanStateRequest
+	30, // 30: daemon.DaemonService.SetLogLevel:input_type -> daemon.SetLogLevelRequest
-	37, // 31: daemon.DaemonService.DeleteState:input_type -> daemon.DeleteStateRequest
+	33, // 31: daemon.DaemonService.ListStates:input_type -> daemon.ListStatesRequest
-	39, // 32: daemon.DaemonService.SetNetworkMapPersistence:input_type -> daemon.SetNetworkMapPersistenceRequest
+	35, // 32: daemon.DaemonService.CleanState:input_type -> daemon.CleanStateRequest
-	2,  // 33: daemon.DaemonService.Login:output_type -> daemon.LoginResponse
+	37, // 33: daemon.DaemonService.DeleteState:input_type -> daemon.DeleteStateRequest
-	4,  // 34: daemon.DaemonService.WaitSSOLogin:output_type -> daemon.WaitSSOLoginResponse
+	39, // 34: daemon.DaemonService.SetNetworkMapPersistence:input_type -> daemon.SetNetworkMapPersistenceRequest
-	6,  // 35: daemon.DaemonService.Up:output_type -> daemon.UpResponse
+	42, // 35: daemon.DaemonService.TracePacket:input_type -> daemon.TracePacketRequest
-	8,  // 36: daemon.DaemonService.Status:output_type -> daemon.StatusResponse
+	2,  // 36: daemon.DaemonService.Login:output_type -> daemon.LoginResponse
-	10, // 37: daemon.DaemonService.Down:output_type -> daemon.DownResponse
+	4,  // 37: daemon.DaemonService.WaitSSOLogin:output_type -> daemon.WaitSSOLoginResponse
-	12, // 38: daemon.DaemonService.GetConfig:output_type -> daemon.GetConfigResponse
+	6,  // 38: daemon.DaemonService.Up:output_type -> daemon.UpResponse
-	21, // 39: daemon.DaemonService.ListNetworks:output_type -> daemon.ListNetworksResponse
+	8,  // 39: daemon.DaemonService.Status:output_type -> daemon.StatusResponse
-	23, // 40: daemon.DaemonService.SelectNetworks:output_type -> daemon.SelectNetworksResponse
+	10, // 40: daemon.DaemonService.Down:output_type -> daemon.DownResponse
-	23, // 41: daemon.DaemonService.DeselectNetworks:output_type -> daemon.SelectNetworksResponse
+	12, // 41: daemon.DaemonService.GetConfig:output_type -> daemon.GetConfigResponse
-	27, // 42: daemon.DaemonService.DebugBundle:output_type -> daemon.DebugBundleResponse
+	21, // 42: daemon.DaemonService.ListNetworks:output_type -> daemon.ListNetworksResponse
-	29, // 43: daemon.DaemonService.GetLogLevel:output_type -> daemon.GetLogLevelResponse
+	23, // 43: daemon.DaemonService.SelectNetworks:output_type -> daemon.SelectNetworksResponse
-	31, // 44: daemon.DaemonService.SetLogLevel:output_type -> daemon.SetLogLevelResponse
+	23, // 44: daemon.DaemonService.DeselectNetworks:output_type -> daemon.SelectNetworksResponse
-	34, // 45: daemon.DaemonService.ListStates:output_type -> daemon.ListStatesResponse
+	27, // 45: daemon.DaemonService.DebugBundle:output_type -> daemon.DebugBundleResponse
-	36, // 46: daemon.DaemonService.CleanState:output_type -> daemon.CleanStateResponse
+	29, // 46: daemon.DaemonService.GetLogLevel:output_type -> daemon.GetLogLevelResponse
-	38, // 47: daemon.DaemonService.DeleteState:output_type -> daemon.DeleteStateResponse
+	31, // 47: daemon.DaemonService.SetLogLevel:output_type -> daemon.SetLogLevelResponse
-	40, // 48: daemon.DaemonService.SetNetworkMapPersistence:output_type -> daemon.SetNetworkMapPersistenceResponse
+	34, // 48: daemon.DaemonService.ListStates:output_type -> daemon.ListStatesResponse
-	33, // [33:49] is the sub-list for method output_type
+	36, // 49: daemon.DaemonService.CleanState:output_type -> daemon.CleanStateResponse
-	17, // [17:33] is the sub-list for method input_type
+	38, // 50: daemon.DaemonService.DeleteState:output_type -> daemon.DeleteStateResponse
-	17, // [17:17] is the sub-list for extension type_name
+	40, // 51: daemon.DaemonService.SetNetworkMapPersistence:output_type -> daemon.SetNetworkMapPersistenceResponse
-	17, // [17:17] is the sub-list for extension extendee
+	44, // 52: daemon.DaemonService.TracePacket:output_type -> daemon.TracePacketResponse
-	0,  // [0:17] is the sub-list for field type_name
+	36, // [36:53] is the sub-list for method output_type
+	19, // [19:36] is the sub-list for method input_type
+	19, // [19:19] is the sub-list for extension type_name
+	19, // [19:19] is the sub-list for extension extendee
+	0,  // [0:19] is the sub-list for field type_name
 }
 
 func init() { file_daemon_proto_init() }
@@ -3606,15 +3992,65 @@ func file_daemon_proto_init() {
 				return nil
 			}
 		}
+		file_daemon_proto_msgTypes[40].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*TCPFlags); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_daemon_proto_msgTypes[41].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*TracePacketRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_daemon_proto_msgTypes[42].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*TraceStage); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_daemon_proto_msgTypes[43].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*TracePacketResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	file_daemon_proto_msgTypes[0].OneofWrappers = []interface{}{}
+	file_daemon_proto_msgTypes[41].OneofWrappers = []interface{}{}
+	file_daemon_proto_msgTypes[42].OneofWrappers = []interface{}{}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_daemon_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   41,
+			NumMessages:   45,
 			NumExtensions: 0,
 			NumServices:   1,
 		},

client/proto/daemon.proto

@@ -57,6 +57,8 @@ service DaemonService {
 
   // SetNetworkMapPersistence enables or disables network map persistence
   rpc SetNetworkMapPersistence(SetNetworkMapPersistenceRequest) returns (SetNetworkMapPersistenceResponse) {}
+
+  rpc TracePacket(TracePacketRequest) returns (TracePacketResponse) {}
 }
 
 
@@ -356,3 +358,36 @@ message SetNetworkMapPersistenceRequest {
 }
 
 message SetNetworkMapPersistenceResponse {}
+
+message TCPFlags {
+  bool syn = 1;
+  bool ack = 2;
+  bool fin = 3;
+  bool rst = 4;
+  bool psh = 5;
+  bool urg = 6;
+}
+
+message TracePacketRequest {
+  string source_ip = 1;
+  string destination_ip = 2;
+  string protocol = 3;
+  uint32 source_port = 4;
+  uint32 destination_port = 5;
+  string direction = 6;
+  optional TCPFlags tcp_flags = 7;
+  optional uint32 icmp_type = 8;
+  optional uint32 icmp_code = 9;
+}
+
+message TraceStage {
+  string name = 1;
+  string message = 2;
+  bool allowed = 3;
+  optional string forwarding_details = 4;
+}
+
+message TracePacketResponse {
+  repeated TraceStage stages = 1;
+  bool final_disposition = 2;
+}

client/proto/daemon_grpc.pb.go

@@ -51,6 +51,7 @@ type DaemonServiceClient interface {
 	DeleteState(ctx context.Context, in *DeleteStateRequest, opts ...grpc.CallOption) (*DeleteStateResponse, error)
 	// SetNetworkMapPersistence enables or disables network map persistence
 	SetNetworkMapPersistence(ctx context.Context, in *SetNetworkMapPersistenceRequest, opts ...grpc.CallOption) (*SetNetworkMapPersistenceResponse, error)
+	TracePacket(ctx context.Context, in *TracePacketRequest, opts ...grpc.CallOption) (*TracePacketResponse, error)
 }
 
 type daemonServiceClient struct {
@@ -205,6 +206,15 @@ func (c *daemonServiceClient) SetNetworkMapPersistence(ctx context.Context, in *
 	return out, nil
 }
 
+func (c *daemonServiceClient) TracePacket(ctx context.Context, in *TracePacketRequest, opts ...grpc.CallOption) (*TracePacketResponse, error) {
+	out := new(TracePacketResponse)
+	err := c.cc.Invoke(ctx, "/daemon.DaemonService/TracePacket", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // DaemonServiceServer is the server API for DaemonService service.
 // All implementations must embed UnimplementedDaemonServiceServer
 // for forward compatibility
@@ -242,6 +252,7 @@ type DaemonServiceServer interface {
 	DeleteState(context.Context, *DeleteStateRequest) (*DeleteStateResponse, error)
 	// SetNetworkMapPersistence enables or disables network map persistence
 	SetNetworkMapPersistence(context.Context, *SetNetworkMapPersistenceRequest) (*SetNetworkMapPersistenceResponse, error)
+	TracePacket(context.Context, *TracePacketRequest) (*TracePacketResponse, error)
 	mustEmbedUnimplementedDaemonServiceServer()
 }
 
@@ -297,6 +308,9 @@ func (UnimplementedDaemonServiceServer) DeleteState(context.Context, *DeleteStat
 func (UnimplementedDaemonServiceServer) SetNetworkMapPersistence(context.Context, *SetNetworkMapPersistenceRequest) (*SetNetworkMapPersistenceResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method SetNetworkMapPersistence not implemented")
 }
+func (UnimplementedDaemonServiceServer) TracePacket(context.Context, *TracePacketRequest) (*TracePacketResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method TracePacket not implemented")
+}
 func (UnimplementedDaemonServiceServer) mustEmbedUnimplementedDaemonServiceServer() {}
 
 // UnsafeDaemonServiceServer may be embedded to opt out of forward compatibility for this service.
@@ -598,6 +612,24 @@ func _DaemonService_SetNetworkMapPersistence_Handler(srv interface{}, ctx contex
 	return interceptor(ctx, in, info, handler)
 }
 
+func _DaemonService_TracePacket_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(TracePacketRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(DaemonServiceServer).TracePacket(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/daemon.DaemonService/TracePacket",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(DaemonServiceServer).TracePacket(ctx, req.(*TracePacketRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // DaemonService_ServiceDesc is the grpc.ServiceDesc for DaemonService service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -669,6 +701,10 @@ var DaemonService_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "SetNetworkMapPersistence",
 			Handler:    _DaemonService_SetNetworkMapPersistence_Handler,
 		},
+		{
+			MethodName: "TracePacket",
+			Handler:    _DaemonService_TracePacket_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "daemon.proto",

client/server/debug.go

@@ -538,7 +538,24 @@ func (s *Server) SetLogLevel(_ context.Context, req *proto.SetLogLevelRequest) (
 	}
 
 	log.SetLevel(level)
+
+	if s.connectClient == nil {
+		return nil, fmt.Errorf("connect client not initialized")
+	}
+	engine := s.connectClient.Engine()
+	if engine == nil {
+		return nil, fmt.Errorf("engine not initialized")
+	}
+
+	fwManager := engine.GetFirewallManager()
+	if fwManager == nil {
+		return nil, fmt.Errorf("firewall manager not initialized")
+	}
+
+	fwManager.SetLogLevel(level)
+
 	log.Infof("Log level set to %s", level.String())
+
 	return &proto.SetLogLevelResponse{}, nil
 }
 

client/server/trace.go

@@ -0,0 +1,123 @@
+package server
+
+import (
+	"context"
+	"fmt"
+	"net"
+
+	fw "github.com/netbirdio/netbird/client/firewall/manager"
+	"github.com/netbirdio/netbird/client/firewall/uspfilter"
+	"github.com/netbirdio/netbird/client/proto"
+)
+
+type packetTracer interface {
+	TracePacketFromBuilder(builder *uspfilter.PacketBuilder) (*uspfilter.PacketTrace, error)
+}
+
+func (s *Server) TracePacket(_ context.Context, req *proto.TracePacketRequest) (*proto.TracePacketResponse, error) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	if s.connectClient == nil {
+		return nil, fmt.Errorf("connect client not initialized")
+	}
+	engine := s.connectClient.Engine()
+	if engine == nil {
+		return nil, fmt.Errorf("engine not initialized")
+	}
+
+	fwManager := engine.GetFirewallManager()
+	if fwManager == nil {
+		return nil, fmt.Errorf("firewall manager not initialized")
+	}
+
+	tracer, ok := fwManager.(packetTracer)
+	if !ok {
+		return nil, fmt.Errorf("firewall manager does not support packet tracing")
+	}
+
+	srcIP := net.ParseIP(req.GetSourceIp())
+	if req.GetSourceIp() == "self" {
+		srcIP = engine.GetWgAddr()
+	}
+
+	dstIP := net.ParseIP(req.GetDestinationIp())
+	if req.GetDestinationIp() == "self" {
+		dstIP = engine.GetWgAddr()
+	}
+
+	if srcIP == nil || dstIP == nil {
+		return nil, fmt.Errorf("invalid IP address")
+	}
+
+	var tcpState *uspfilter.TCPState
+	if flags := req.GetTcpFlags(); flags != nil {
+		tcpState = &uspfilter.TCPState{
+			SYN: flags.GetSyn(),
+			ACK: flags.GetAck(),
+			FIN: flags.GetFin(),
+			RST: flags.GetRst(),
+			PSH: flags.GetPsh(),
+			URG: flags.GetUrg(),
+		}
+	}
+
+	var dir fw.RuleDirection
+	switch req.GetDirection() {
+	case "in":
+		dir = fw.RuleDirectionIN
+	case "out":
+		dir = fw.RuleDirectionOUT
+	default:
+		return nil, fmt.Errorf("invalid direction")
+	}
+
+	var protocol fw.Protocol
+	switch req.GetProtocol() {
+	case "tcp":
+		protocol = fw.ProtocolTCP
+	case "udp":
+		protocol = fw.ProtocolUDP
+	case "icmp":
+		protocol = fw.ProtocolICMP
+	default:
+		return nil, fmt.Errorf("invalid protocolcol")
+	}
+
+	builder := &uspfilter.PacketBuilder{
+		SrcIP:     srcIP,
+		DstIP:     dstIP,
+		Protocol:  protocol,
+		SrcPort:   uint16(req.GetSourcePort()),
+		DstPort:   uint16(req.GetDestinationPort()),
+		Direction: dir,
+		TCPState:  tcpState,
+		ICMPType:  uint8(req.GetIcmpType()),
+		ICMPCode:  uint8(req.GetIcmpCode()),
+	}
+	trace, err := tracer.TracePacketFromBuilder(builder)
+	if err != nil {
+		return nil, fmt.Errorf("trace packet: %w", err)
+	}
+
+	resp := &proto.TracePacketResponse{}
+
+	for _, result := range trace.Results {
+		stage := &proto.TraceStage{
+			Name:    result.Stage.String(),
+			Message: result.Message,
+			Allowed: result.Allowed,
+		}
+		if result.ForwarderAction != nil {
+			details := fmt.Sprintf("%s to %s", result.ForwarderAction.Action, result.ForwarderAction.RemoteAddr)
+			stage.ForwardingDetails = &details
+		}
+		resp.Stages = append(resp.Stages, stage)
+	}
+
+	if len(trace.Results) > 0 {
+		resp.FinalDisposition = trace.Results[len(trace.Results)-1].Allowed
+	}
+
+	return resp, nil
+}

go.mod

@@ -102,6 +102,7 @@ require (
 	gorm.io/driver/postgres v1.5.7
 	gorm.io/driver/sqlite v1.5.7
 	gorm.io/gorm v1.25.12
+	gvisor.dev/gvisor v0.0.0-20231020174304-b8a429915ff1
 )
 
 require (
@@ -237,7 +238,6 @@ require (
 	gopkg.in/square/go-jose.v2 v2.6.0 // indirect
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 	gopkg.in/tomb.v2 v2.0.0-20161208151619-d5d1b5820637 // indirect
-	gvisor.dev/gvisor v0.0.0-20231020174304-db3d49b921f9 // indirect
 	k8s.io/apimachinery v0.26.2 // indirect
 )
 
@@ -245,7 +245,7 @@ replace github.com/kardianos/service => github.com/netbirdio/service v0.0.0-2024
 
 replace github.com/getlantern/systray => github.com/netbirdio/systray v0.0.0-20231030152038-ef1ed2a27949
 
-replace golang.zx2c4.com/wireguard => github.com/netbirdio/wireguard-go v0.0.0-20241125150134-f9cdce5e32e9
+replace golang.zx2c4.com/wireguard => github.com/netbirdio/wireguard-go v0.0.0-20241230120307-6a676aebaaf6
 
 replace github.com/cloudflare/circl => github.com/cunicu/circl v0.0.0-20230801113412-fec58fc7b5f6
 

go.sum

@@ -535,8 +535,8 @@ github.com/netbirdio/service v0.0.0-20240911161631-f62744f42502 h1:3tHlFmhTdX9ax
 github.com/netbirdio/service v0.0.0-20240911161631-f62744f42502/go.mod h1:CIMRFEJVL+0DS1a3Nx06NaMn4Dz63Ng6O7dl0qH0zVM=
 github.com/netbirdio/signal-dispatcher/dispatcher v0.0.0-20241010133937-e0df50df217d h1:bRq5TKgC7Iq20pDiuC54yXaWnAVeS5PdGpSokFTlR28=
 github.com/netbirdio/signal-dispatcher/dispatcher v0.0.0-20241010133937-e0df50df217d/go.mod h1:5/sjFmLb8O96B5737VCqhHyGRzNFIaN/Bu7ZodXc3qQ=
-github.com/netbirdio/wireguard-go v0.0.0-20241125150134-f9cdce5e32e9 h1:Pu/7EukijT09ynHUOzQYW7cC3M/BKU8O4qyN/TvTGoY=
+github.com/netbirdio/wireguard-go v0.0.0-20241230120307-6a676aebaaf6 h1:X5h5QgP7uHAv78FWgHV8+WYLjHxK9v3ilkVXT1cpCrQ=
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@@ -1250,8 +1250,8 @@ gorm.io/gorm v1.25.12 h1:I0u8i2hWQItBq1WfE0o2+WuL9+8L21K9e2HHSTE/0f8=
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