Add packet tracer

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/uspfilter/tracer.go

@@ -0,0 +1,388 @@
+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.localipmanager.IsLocalIP(dstIP) {
+		return false
+	}
+
+	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/internal/engine.go

@@ -1624,6 +1624,14 @@ 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/proto/daemon.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.21.9
+// 	protoc        v4.23.4
 // source: daemon.proto
 
 package proto
@@ -2531,6 +2531,330 @@ 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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-	0x65, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x1b, 0x2e, 0x64, 0x61, 0x65, 0x6d, 0x6f,
+	0x6c, 0x65, 0x74, 0x65, 0x53, 0x74, 0x61, 0x74, 0x65, 0x12, 0x1a, 0x2e, 0x64, 0x61, 0x65, 0x6d,
-	0x6e, 0x2e, 0x44, 0x65, 0x6c, 0x65, 0x74, 0x65, 0x53, 0x74, 0x61, 0x74, 0x65, 0x52, 0x65, 0x73,
+	0x6f, 0x6e, 0x2e, 0x44, 0x65, 0x6c, 0x65, 0x74, 0x65, 0x53, 0x74, 0x61, 0x74, 0x65, 0x52, 0x65,
-	0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x12, 0x6f, 0x0a, 0x18, 0x53, 0x65, 0x74, 0x4e, 0x65,
+	0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x1b, 0x2e, 0x64, 0x61, 0x65, 0x6d, 0x6f, 0x6e, 0x2e, 0x44,
-	0x74, 0x77, 0x6f, 0x72, 0x6b, 0x4d, 0x61, 0x70, 0x50, 0x65, 0x72, 0x73, 0x69, 0x73, 0x74, 0x65,
+	0x65, 0x6c, 0x65, 0x74, 0x65, 0x53, 0x74, 0x61, 0x74, 0x65, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e,
-	0x6e, 0x63, 0x65, 0x12, 0x27, 0x2e, 0x64, 0x61, 0x65, 0x6d, 0x6f, 0x6e, 0x2e, 0x53, 0x65, 0x74,
+	0x73, 0x65, 0x22, 0x00, 0x12, 0x6f, 0x0a, 0x18, 0x53, 0x65, 0x74, 0x4e, 0x65, 0x74, 0x77, 0x6f,
-	0x4e, 0x65, 0x74, 0x77, 0x6f, 0x72, 0x6b, 0x4d, 0x61, 0x70, 0x50, 0x65, 0x72, 0x73, 0x69, 0x73,
+	0x72, 0x6b, 0x4d, 0x61, 0x70, 0x50, 0x65, 0x72, 0x73, 0x69, 0x73, 0x74, 0x65, 0x6e, 0x63, 0x65,
-	0x74, 0x65, 0x6e, 0x63, 0x65, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x28, 0x2e, 0x64,
+	0x12, 0x27, 0x2e, 0x64, 0x61, 0x65, 0x6d, 0x6f, 0x6e, 0x2e, 0x53, 0x65, 0x74, 0x4e, 0x65, 0x74,
-	0x61, 0x65, 0x6d, 0x6f, 0x6e, 0x2e, 0x53, 0x65, 0x74, 0x4e, 0x65, 0x74, 0x77, 0x6f, 0x72, 0x6b,
+	0x77, 0x6f, 0x72, 0x6b, 0x4d, 0x61, 0x70, 0x50, 0x65, 0x72, 0x73, 0x69, 0x73, 0x74, 0x65, 0x6e,
-	0x4d, 0x61, 0x70, 0x50, 0x65, 0x72, 0x73, 0x69, 0x73, 0x74, 0x65, 0x6e, 0x63, 0x65, 0x52, 0x65,
+	0x63, 0x65, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x28, 0x2e, 0x64, 0x61, 0x65, 0x6d,
-	0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x42, 0x08, 0x5a, 0x06, 0x2f, 0x70, 0x72, 0x6f,
+	0x6f, 0x6e, 0x2e, 0x53, 0x65, 0x74, 0x4e, 0x65, 0x74, 0x77, 0x6f, 0x72, 0x6b, 0x4d, 0x61, 0x70,
-	0x74, 0x6f, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x50, 0x65, 0x72, 0x73, 0x69, 0x73, 0x74, 0x65, 0x6e, 0x63, 0x65, 0x52, 0x65, 0x73, 0x70, 0x6f,
+	0x6e, 0x73, 0x65, 0x22, 0x00, 0x12, 0x48, 0x0a, 0x0b, 0x54, 0x72, 0x61, 0x63, 0x65, 0x50, 0x61,
+	0x63, 0x6b, 0x65, 0x74, 0x12, 0x1a, 0x2e, 0x64, 0x61, 0x65, 0x6d, 0x6f, 0x6e, 0x2e, 0x54, 0x72,
+	0x61, 0x63, 0x65, 0x50, 0x61, 0x63, 0x6b, 0x65, 0x74, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74,
+	0x1a, 0x1b, 0x2e, 0x64, 0x61, 0x65, 0x6d, 0x6f, 0x6e, 0x2e, 0x54, 0x72, 0x61, 0x63, 0x65, 0x50,
+	0x61, 0x63, 0x6b, 0x65, 0x74, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x42,
+	0x08, 0x5a, 0x06, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+	0x33,
 }
 
 var (
@@ -2954,7 +3332,7 @@ 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
@@ -2997,16 +3375,20 @@ 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
@@ -3014,48 +3396,52 @@ 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() }
@@ -3544,15 +3930,65 @@ 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) {}
 }
 
 
@@ -349,3 +351,36 @@ 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/trace.go

@@ -0,0 +1,119 @@
+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 || s.connectClient.Engine() == nil {
+		return nil, fmt.Errorf("engine not initialized")
+	}
+
+	fwManager := s.connectClient.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 = s.connectClient.Engine().GetWgAddr()
+	}
+
+	dstIP := net.ParseIP(req.GetDestinationIp())
+	if req.GetDestinationIp() == "self" {
+		dstIP = s.connectClient.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
+}