Skip network map calculation when client serial matches current

Signed-off-by: bcmmbaga <bethuelmbaga12@gmail.com>

client/internal/engine.go

@@ -797,7 +797,7 @@ func (e *Engine) handleSync(update *mgmProto.SyncResponse) error {
 	}
 
 	nm := update.GetNetworkMap()
-	if nm == nil {
+	if nm == nil || update.SkipNetworkMapUpdate {
 		return nil
 	}
 
@@ -963,7 +963,7 @@ func (e *Engine) receiveManagementEvents() {
 			e.config.DisableSSHAuth,
 		)
 
-		err = e.mgmClient.Sync(e.ctx, info, e.handleSync)
+		err = e.mgmClient.Sync(e.ctx, info, e.networkSerial, e.handleSync)
 		if err != nil {
 			// happens if management is unavailable for a long time.
 			// We want to cancel the operation of the whole client

client/internal/engine_sync_test.go

@@ -0,0 +1,79 @@
+package internal
+
+import (
+    "context"
+    "testing"
+
+    "golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+
+    "github.com/netbirdio/netbird/client/iface"
+    "github.com/netbirdio/netbird/client/internal/peer"
+    "github.com/netbirdio/netbird/shared/management/client"
+    mgmtProto "github.com/netbirdio/netbird/shared/management/proto"
+)
+
+// Ensures handleSync exits early when SkipNetworkMapUpdate is true
+func TestEngine_HandleSync_SkipNetworkMapUpdate(t *testing.T) {
+    key, err := wgtypes.GeneratePrivateKey()
+    if err != nil {
+        t.Fatal(err)
+    }
+
+    ctx, cancel := context.WithCancel(context.Background())
+    defer cancel()
+
+    engine := NewEngine(ctx, cancel, nil, &client.MockClient{}, nil, &EngineConfig{
+        WgIfaceName:  "utun199",
+        WgAddr:       "100.70.0.1/24",
+        WgPrivateKey: key,
+        WgPort:       33100,
+        MTU:          iface.DefaultMTU,
+    }, MobileDependency{}, peer.NewRecorder("https://mgm"), nil)
+    engine.ctx = ctx
+
+    // Precondition
+    if engine.networkSerial != 0 {
+        t.Fatalf("unexpected initial serial: %d", engine.networkSerial)
+    }
+
+    resp := &mgmtProto.SyncResponse{
+        NetworkMap: &mgmtProto.NetworkMap{Serial: 42},
+        SkipNetworkMapUpdate: true,
+    }
+
+    if err := engine.handleSync(resp); err != nil {
+        t.Fatalf("handleSync returned error: %v", err)
+    }
+
+    if engine.networkSerial != 0 {
+        t.Fatalf("networkSerial changed despite SkipNetworkMapUpdate; got %d, want 0", engine.networkSerial)
+    }
+}
+
+// Ensures handleSync exits early when NetworkMap is nil
+func TestEngine_HandleSync_NilNetworkMap(t *testing.T) {
+    key, err := wgtypes.GeneratePrivateKey()
+    if err != nil {
+        t.Fatal(err)
+    }
+
+    ctx, cancel := context.WithCancel(context.Background())
+    defer cancel()
+
+    engine := NewEngine(ctx, cancel, nil, &client.MockClient{}, nil, &EngineConfig{
+        WgIfaceName:  "utun198",
+        WgAddr:       "100.70.0.2/24",
+        WgPrivateKey: key,
+        WgPort:       33101,
+        MTU:          iface.DefaultMTU,
+    }, MobileDependency{}, peer.NewRecorder("https://mgm"), nil)
+    engine.ctx = ctx
+
+    resp := &mgmtProto.SyncResponse{NetworkMap: nil}
+
+    if err := engine.handleSync(resp); err != nil {
+        t.Fatalf("handleSync returned error: %v", err)
+    }
+}
+
+

client/internal/engine_test.go

@@ -631,7 +631,7 @@ func TestEngine_Sync(t *testing.T) {
 	// feed updates to Engine via mocked Management client
 	updates := make(chan *mgmtProto.SyncResponse)
 	defer close(updates)
-	syncFunc := func(ctx context.Context, info *system.Info, msgHandler func(msg *mgmtProto.SyncResponse) error) error {
+	syncFunc := func(ctx context.Context, info *system.Info, networkSerial uint64, msgHandler func(msg *mgmtProto.SyncResponse) error) error {
 		for msg := range updates {
 			err := msgHandler(msg)
 			if err != nil {

client/system/info.go

@@ -120,6 +120,26 @@ func (i *Info) SetFlags(
 	}
 }
 
+func (i *Info) CopyFlagsFrom(other *Info) {
+	i.SetFlags(
+		other.RosenpassEnabled,
+		other.RosenpassPermissive,
+		&other.ServerSSHAllowed,
+		other.DisableClientRoutes,
+		other.DisableServerRoutes,
+		other.DisableDNS,
+		other.DisableFirewall,
+		other.BlockLANAccess,
+		other.BlockInbound,
+		other.LazyConnectionEnabled,
+		&other.EnableSSHRoot,
+		&other.EnableSSHSFTP,
+		&other.EnableSSHLocalPortForwarding,
+		&other.EnableSSHRemotePortForwarding,
+		&other.DisableSSHAuth,
+	)
+}
+
 // extractUserAgent extracts Netbird's agent (client) name and version from the outgoing context
 func extractUserAgent(ctx context.Context) string {
 	md, hasMeta := metadata.FromOutgoingContext(ctx)

client/system/info_test.go

@@ -8,6 +8,90 @@ import (
 	"google.golang.org/grpc/metadata"
 )
 
+func TestInfo_CopyFlagsFrom(t *testing.T) {
+	origin := &Info{}
+	serverSSHAllowed := true
+	enableSSHRoot := true
+	enableSSHSFTP := false
+	enableSSHLocalPortForwarding := true
+	enableSSHRemotePortForwarding := false
+	disableSSHAuth := true
+	origin.SetFlags(
+		true,  // RosenpassEnabled
+		false, // RosenpassPermissive
+		&serverSSHAllowed,
+		true,  // DisableClientRoutes
+		false, // DisableServerRoutes
+		true,  // DisableDNS
+		false, // DisableFirewall
+		true,  // BlockLANAccess
+		false, // BlockInbound
+		true,  // LazyConnectionEnabled
+		&enableSSHRoot,
+		&enableSSHSFTP,
+		&enableSSHLocalPortForwarding,
+		&enableSSHRemotePortForwarding,
+		&disableSSHAuth,
+	)
+
+	got := &Info{}
+	got.CopyFlagsFrom(origin)
+
+	if got.RosenpassEnabled != true {
+		t.Fatalf("RosenpassEnabled not copied: got %v", got.RosenpassEnabled)
+	}
+	if got.RosenpassPermissive != false {
+		t.Fatalf("RosenpassPermissive not copied: got %v", got.RosenpassPermissive)
+	}
+	if got.ServerSSHAllowed != true {
+		t.Fatalf("ServerSSHAllowed not copied: got %v", got.ServerSSHAllowed)
+	}
+	if got.DisableClientRoutes != true {
+		t.Fatalf("DisableClientRoutes not copied: got %v", got.DisableClientRoutes)
+	}
+	if got.DisableServerRoutes != false {
+		t.Fatalf("DisableServerRoutes not copied: got %v", got.DisableServerRoutes)
+	}
+	if got.DisableDNS != true {
+		t.Fatalf("DisableDNS not copied: got %v", got.DisableDNS)
+	}
+	if got.DisableFirewall != false {
+		t.Fatalf("DisableFirewall not copied: got %v", got.DisableFirewall)
+	}
+	if got.BlockLANAccess != true {
+		t.Fatalf("BlockLANAccess not copied: got %v", got.BlockLANAccess)
+	}
+	if got.BlockInbound != false {
+		t.Fatalf("BlockInbound not copied: got %v", got.BlockInbound)
+	}
+	if got.LazyConnectionEnabled != true {
+		t.Fatalf("LazyConnectionEnabled not copied: got %v", got.LazyConnectionEnabled)
+	}
+	if got.EnableSSHRoot != true {
+		t.Fatalf("EnableSSHRoot not copied: got %v", got.EnableSSHRoot)
+	}
+	if got.EnableSSHSFTP != false {
+		t.Fatalf("EnableSSHSFTP not copied: got %v", got.EnableSSHSFTP)
+	}
+	if got.EnableSSHLocalPortForwarding != true {
+		t.Fatalf("EnableSSHLocalPortForwarding not copied: got %v", got.EnableSSHLocalPortForwarding)
+	}
+	if got.EnableSSHRemotePortForwarding != false {
+		t.Fatalf("EnableSSHRemotePortForwarding not copied: got %v", got.EnableSSHRemotePortForwarding)
+	}
+	if got.DisableSSHAuth != true {
+		t.Fatalf("DisableSSHAuth not copied: got %v", got.DisableSSHAuth)
+	}
+
+	// ensure CopyFlagsFrom does not touch unrelated fields
+	origin.Hostname = "host-a"
+	got.Hostname = "host-b"
+	got.CopyFlagsFrom(origin)
+	if got.Hostname != "host-b" {
+		t.Fatalf("CopyFlagsFrom should not overwrite non-flag fields, got Hostname=%q", got.Hostname)
+	}
+}
+
 func Test_LocalWTVersion(t *testing.T) {
 	got := GetInfo(context.TODO())
 	want := "development"

management/internals/controllers/network_map/controller/controller.go

@@ -394,23 +394,26 @@ func (c *Controller) BufferUpdateAccountPeers(ctx context.Context, accountID str
 	return nil
 }
 
-func (c *Controller) GetValidatedPeerWithMap(ctx context.Context, isRequiresApproval bool, accountID string, peer *nbpeer.Peer) (*nbpeer.Peer, *types.NetworkMap, []*posture.Checks, int64, error) {
-	if isRequiresApproval {
-		network, err := c.repo.GetAccountNetwork(ctx, accountID)
-		if err != nil {
-			return nil, nil, nil, 0, err
-		}
+func (c *Controller) GetValidatedPeerWithMap(ctx context.Context, isRequiresApproval bool, accountID string, peer *nbpeer.Peer, clientSerial uint64) (*nbpeer.Peer, *types.NetworkMap, []*posture.Checks, int64, error) {
+	network, err := c.repo.GetAccountNetwork(ctx, accountID)
+	if err != nil {
+		return nil, nil, nil, 0, err
+	}
 
+	if isRequiresApproval {
 		emptyMap := &types.NetworkMap{
 			Network: network.Copy(),
 		}
 		return peer, emptyMap, nil, 0, nil
 	}
 
-	var (
-		account *types.Account
-		err     error
-	)
+	if clientSerial > 0 && clientSerial == network.CurrentSerial() {
+		log.WithContext(ctx).Debugf("client serial %d matches current serial, skipping network map calculation", clientSerial)
+		return peer, nil, nil, 0, nil
+	}
+
+	var account *types.Account
+
 	if c.experimentalNetworkMap(accountID) {
 		account = c.getAccountFromHolderOrInit(accountID)
 	} else {

management/internals/controllers/network_map/interface.go

@@ -24,7 +24,7 @@ type Controller interface {
 	UpdateAccountPeers(ctx context.Context, accountID string) error
 	UpdateAccountPeer(ctx context.Context, accountId string, peerId string) error
 	BufferUpdateAccountPeers(ctx context.Context, accountID string) error
-	GetValidatedPeerWithMap(ctx context.Context, isRequiresApproval bool, accountID string, p *nbpeer.Peer) (*nbpeer.Peer, *types.NetworkMap, []*posture.Checks, int64, error)
+	GetValidatedPeerWithMap(ctx context.Context, isRequiresApproval bool, accountID string, p *nbpeer.Peer, clientSerial uint64) (*nbpeer.Peer, *types.NetworkMap, []*posture.Checks, int64, error)
 	GetDNSDomain(settings *types.Settings) string
 	StartWarmup(context.Context)
 	GetNetworkMap(ctx context.Context, peerID string) (*types.NetworkMap, error)

management/internals/controllers/network_map/interface_mock.go

@@ -113,9 +113,9 @@ func (mr *MockControllerMockRecorder) GetNetworkMap(ctx, peerID any) *gomock.Cal
 }
 
 // GetValidatedPeerWithMap mocks base method.
-func (m *MockController) GetValidatedPeerWithMap(ctx context.Context, isRequiresApproval bool, accountID string, p *peer.Peer) (*peer.Peer, *types.NetworkMap, []*posture.Checks, int64, error) {
+func (m *MockController) GetValidatedPeerWithMap(ctx context.Context, isRequiresApproval bool, accountID string, p *peer.Peer, clientSerial uint64) (*peer.Peer, *types.NetworkMap, []*posture.Checks, int64, error) {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "GetValidatedPeerWithMap", ctx, isRequiresApproval, accountID, p)
+	ret := m.ctrl.Call(m, "GetValidatedPeerWithMap", ctx, isRequiresApproval, accountID, p, clientSerial)
 	ret0, _ := ret[0].(*peer.Peer)
 	ret1, _ := ret[1].(*types.NetworkMap)
 	ret2, _ := ret[2].([]*posture.Checks)
@@ -125,9 +125,9 @@ func (m *MockController) GetValidatedPeerWithMap(ctx context.Context, isRequires
 }
 
 // GetValidatedPeerWithMap indicates an expected call of GetValidatedPeerWithMap.
-func (mr *MockControllerMockRecorder) GetValidatedPeerWithMap(ctx, isRequiresApproval, accountID, p any) *gomock.Call {
+func (mr *MockControllerMockRecorder) GetValidatedPeerWithMap(ctx, isRequiresApproval, accountID, p, clientSerial any) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetValidatedPeerWithMap", reflect.TypeOf((*MockController)(nil).GetValidatedPeerWithMap), ctx, isRequiresApproval, accountID, p)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetValidatedPeerWithMap", reflect.TypeOf((*MockController)(nil).GetValidatedPeerWithMap), ctx, isRequiresApproval, accountID, p, clientSerial)
 }
 
 // OnPeerConnected mocks base method.

management/internals/shared/grpc/conversion.go

@@ -104,6 +104,20 @@ func toPeerConfig(peer *nbpeer.Peer, network *types.Network, dnsName string, set
 	}
 }
 
+// ToSkipSyncResponse creates a minimal SyncResponse when the client already has the latest network map.
+func ToSkipSyncResponse(ctx context.Context, config *nbconfig.Config, peer *nbpeer.Peer, turnCredentials *Token, relayCredentials *Token, checks []*posture.Checks, extraSettings *types.ExtraSettings, peerGroups []string) *proto.SyncResponse {
+	response := &proto.SyncResponse{
+		SkipNetworkMapUpdate: true,
+		Checks:               toProtocolChecks(ctx, checks),
+	}
+
+	nbConfig := toNetbirdConfig(config, turnCredentials, relayCredentials, extraSettings)
+	extendedConfig := integrationsConfig.ExtendNetBirdConfig(peer.ID, peerGroups, nbConfig, extraSettings)
+	response.NetbirdConfig = extendedConfig
+
+	return response
+}
+
 func ToSyncResponse(ctx context.Context, config *nbconfig.Config, httpConfig *nbconfig.HttpServerConfig, deviceFlowConfig *nbconfig.DeviceAuthorizationFlow, peer *nbpeer.Peer, turnCredentials *Token, relayCredentials *Token, networkMap *types.NetworkMap, dnsName string, checks []*posture.Checks, dnsCache *cache.DNSConfigCache, settings *types.Settings, extraSettings *types.ExtraSettings, peerGroups []string, dnsFwdPort int64) *proto.SyncResponse {
 	response := &proto.SyncResponse{
 		PeerConfig: toPeerConfig(peer, networkMap.Network, dnsName, settings, httpConfig, deviceFlowConfig),

management/internals/shared/grpc/server.go

@@ -239,7 +239,7 @@ func (s *Server) Sync(req *proto.EncryptedMessage, srv proto.ManagementService_S
 	metahash := metaHash(peerMeta, realIP.String())
 	s.loginFilter.addLogin(peerKey.String(), metahash)
 
-	peer, netMap, postureChecks, dnsFwdPort, err := s.accountManager.SyncAndMarkPeer(ctx, accountID, peerKey.String(), peerMeta, realIP)
+	peer, netMap, postureChecks, dnsFwdPort, err := s.accountManager.SyncAndMarkPeer(ctx, accountID, peerKey.String(), peerMeta, realIP, syncReq.GetNetworkMapSerial())
 	if err != nil {
 		log.WithContext(ctx).Debugf("error while syncing peer %s: %v", peerKey.String(), err)
 		s.syncSem.Add(-1)
@@ -702,7 +702,12 @@ func (s *Server) sendInitialSync(ctx context.Context, peerKey wgtypes.Key, peer
 		return status.Errorf(codes.Internal, "failed to get peer groups %s", err)
 	}
 
-	plainResp := ToSyncResponse(ctx, s.config, s.config.HttpConfig, s.config.DeviceAuthorizationFlow, peer, turnToken, relayToken, networkMap, s.networkMapController.GetDNSDomain(settings), postureChecks, nil, settings, settings.Extra, peerGroups, dnsFwdPort)
+	var plainResp *proto.SyncResponse
+	if networkMap == nil {
+		plainResp = ToSkipSyncResponse(ctx, s.config, peer, turnToken, relayToken, postureChecks, settings.Extra, peerGroups)
+	} else {
+		plainResp = ToSyncResponse(ctx, s.config, s.config.HttpConfig, s.config.DeviceAuthorizationFlow, peer, turnToken, relayToken, networkMap, s.networkMapController.GetDNSDomain(settings), postureChecks, nil, settings, settings.Extra, peerGroups, dnsFwdPort)
+	}
 
 	key, err := s.secretsManager.GetWGKey()
 	if err != nil {

management/server/account.go

@@ -1617,8 +1617,8 @@ func domainIsUpToDate(domain string, domainCategory string, userAuth auth.UserAu
 	return domainCategory == types.PrivateCategory || userAuth.DomainCategory != types.PrivateCategory || domain != userAuth.Domain
 }
 
-func (am *DefaultAccountManager) SyncAndMarkPeer(ctx context.Context, accountID string, peerPubKey string, meta nbpeer.PeerSystemMeta, realIP net.IP) (*nbpeer.Peer, *types.NetworkMap, []*posture.Checks, int64, error) {
-	peer, netMap, postureChecks, dnsfwdPort, err := am.SyncPeer(ctx, types.PeerSync{WireGuardPubKey: peerPubKey, Meta: meta}, accountID)
+func (am *DefaultAccountManager) SyncAndMarkPeer(ctx context.Context, accountID string, peerPubKey string, meta nbpeer.PeerSystemMeta, realIP net.IP, clientSerial uint64) (*nbpeer.Peer, *types.NetworkMap, []*posture.Checks, int64, error) {
+	peer, netMap, postureChecks, dnsfwdPort, err := am.SyncPeer(ctx, types.PeerSync{WireGuardPubKey: peerPubKey, Meta: meta, NetworkMapSerial: clientSerial}, accountID)
 	if err != nil {
 		return nil, nil, nil, 0, fmt.Errorf("error syncing peer: %w", err)
 	}

management/server/account/manager.go

@@ -107,7 +107,7 @@ type Manager interface {
 	UpdateIntegratedValidator(ctx context.Context, accountID, userID, validator string, groups []string) error
 	GroupValidation(ctx context.Context, accountId string, groups []string) (bool, error)
 	GetValidatedPeers(ctx context.Context, accountID string) (map[string]struct{}, map[string]string, error)
-	SyncAndMarkPeer(ctx context.Context, accountID string, peerPubKey string, meta nbpeer.PeerSystemMeta, realIP net.IP) (*nbpeer.Peer, *types.NetworkMap, []*posture.Checks, int64, error)
+	SyncAndMarkPeer(ctx context.Context, accountID string, peerPubKey string, meta nbpeer.PeerSystemMeta, realIP net.IP, clientSerial uint64) (*nbpeer.Peer, *types.NetworkMap, []*posture.Checks, int64, error)
 	OnPeerDisconnected(ctx context.Context, accountID string, peerPubKey string) error
 	SyncPeerMeta(ctx context.Context, peerPubKey string, meta nbpeer.PeerSystemMeta) error
 	FindExistingPostureCheck(accountID string, checks *posture.ChecksDefinition) (*posture.Checks, error)

management/server/account_test.go

@@ -3144,7 +3144,7 @@ func BenchmarkSyncAndMarkPeer(b *testing.B) {
 			b.ResetTimer()
 			start := time.Now()
 			for i := 0; i < b.N; i++ {
-				_, _, _, _, err := manager.SyncAndMarkPeer(context.Background(), account.Id, account.Peers["peer-1"].Key, nbpeer.PeerSystemMeta{Hostname: strconv.Itoa(i)}, net.IP{1, 1, 1, 1})
+				_, _, _, _, err := manager.SyncAndMarkPeer(context.Background(), account.Id, account.Peers["peer-1"].Key, nbpeer.PeerSystemMeta{Hostname: strconv.Itoa(i)}, net.IP{1, 1, 1, 1}, 0)
 				assert.NoError(b, err)
 			}
 

management/server/mock_server/account_mock.go

@@ -37,7 +37,7 @@ type MockAccountManager struct {
 	ListUsersFunc                         func(ctx context.Context, accountID string) ([]*types.User, error)
 	GetPeersFunc                          func(ctx context.Context, accountID, userID, nameFilter, ipFilter string) ([]*nbpeer.Peer, error)
 	MarkPeerConnectedFunc                 func(ctx context.Context, peerKey string, connected bool, realIP net.IP) error
-	SyncAndMarkPeerFunc                   func(ctx context.Context, accountID string, peerPubKey string, meta nbpeer.PeerSystemMeta, realIP net.IP) (*nbpeer.Peer, *types.NetworkMap, []*posture.Checks, int64, error)
+	SyncAndMarkPeerFunc                   func(ctx context.Context, accountID string, peerPubKey string, meta nbpeer.PeerSystemMeta, realIP net.IP, clientSerial uint64) (*nbpeer.Peer, *types.NetworkMap, []*posture.Checks, int64, error)
 	DeletePeerFunc                        func(ctx context.Context, accountID, peerKey, userID string) error
 	GetNetworkMapFunc                     func(ctx context.Context, peerKey string) (*types.NetworkMap, error)
 	GetPeerNetworkFunc                    func(ctx context.Context, peerKey string) (*types.Network, error)
@@ -177,9 +177,9 @@ func (am *MockAccountManager) DeleteSetupKey(ctx context.Context, accountID, use
 	return status.Errorf(codes.Unimplemented, "method DeleteSetupKey is not implemented")
 }
 
-func (am *MockAccountManager) SyncAndMarkPeer(ctx context.Context, accountID string, peerPubKey string, meta nbpeer.PeerSystemMeta, realIP net.IP) (*nbpeer.Peer, *types.NetworkMap, []*posture.Checks, int64, error) {
+func (am *MockAccountManager) SyncAndMarkPeer(ctx context.Context, accountID string, peerPubKey string, meta nbpeer.PeerSystemMeta, realIP net.IP, clientSerial uint64) (*nbpeer.Peer, *types.NetworkMap, []*posture.Checks, int64, error) {
 	if am.SyncAndMarkPeerFunc != nil {
-		return am.SyncAndMarkPeerFunc(ctx, accountID, peerPubKey, meta, realIP)
+		return am.SyncAndMarkPeerFunc(ctx, accountID, peerPubKey, meta, realIP, clientSerial)
 	}
 	return nil, nil, nil, 0, status.Errorf(codes.Unimplemented, "method MarkPeerConnected is not implemented")
 }

management/server/peer.go

@@ -645,7 +645,7 @@ func (am *DefaultAccountManager) AddPeer(ctx context.Context, accountID, setupKe
 		log.WithContext(ctx).Errorf("failed to update network map cache for peer %s: %v", newPeer.ID, err)
 	}
 
-	p, nmap, pc, _, err := am.networkMapController.GetValidatedPeerWithMap(ctx, false, accountID, newPeer)
+	p, nmap, pc, _, err := am.networkMapController.GetValidatedPeerWithMap(ctx, false, accountID, newPeer, 0)
 	return p, nmap, pc, err
 }
 
@@ -731,7 +731,7 @@ func (am *DefaultAccountManager) SyncPeer(ctx context.Context, sync types.PeerSy
 		}
 	}
 
-	return am.networkMapController.GetValidatedPeerWithMap(ctx, peerNotValid, accountID, peer)
+	return am.networkMapController.GetValidatedPeerWithMap(ctx, peerNotValid, accountID, peer, sync.NetworkMapSerial)
 }
 
 func (am *DefaultAccountManager) handlePeerLoginNotFound(ctx context.Context, login types.PeerLogin, err error) (*nbpeer.Peer, *types.NetworkMap, []*posture.Checks, error) {
@@ -859,7 +859,7 @@ func (am *DefaultAccountManager) LoginPeer(ctx context.Context, login types.Peer
 		}
 	}
 
-	p, nmap, pc, _, err := am.networkMapController.GetValidatedPeerWithMap(ctx, isRequiresApproval, accountID, peer)
+	p, nmap, pc, _, err := am.networkMapController.GetValidatedPeerWithMap(ctx, isRequiresApproval, accountID, peer, 0)
 	return p, nmap, pc, err
 }
 

management/server/types/peer.go

@@ -15,6 +15,9 @@ type PeerSync struct {
 	// UpdateAccountPeers indicate updating account peers,
 	// which occurs when the peer's metadata is updated
 	UpdateAccountPeers bool
+	// NetworkMapSerial is the last known network map serial number on the client.
+	// Used to skip network map recalculation if client already has the latest.
+	NetworkMapSerial uint64
 }
 
 // PeerLogin used as a data object between the gRPC API and Manager on Login request.

shared/management/client/client.go

@@ -13,7 +13,7 @@ import (
 
 type Client interface {
 	io.Closer
-	Sync(ctx context.Context, sysInfo *system.Info, msgHandler func(msg *proto.SyncResponse) error) error
+	Sync(ctx context.Context, sysInfo *system.Info, networkSerial uint64, msgHandler func(msg *proto.SyncResponse) error) error
 	GetServerPublicKey() (*wgtypes.Key, error)
 	Register(serverKey wgtypes.Key, setupKey string, jwtToken string, sysInfo *system.Info, sshKey []byte, dnsLabels domain.List) (*proto.LoginResponse, error)
 	Login(serverKey wgtypes.Key, sysInfo *system.Info, sshKey []byte, dnsLabels domain.List) (*proto.LoginResponse, error)

shared/management/client/client_test.go

@@ -313,7 +313,7 @@ func TestClient_Sync(t *testing.T) {
 	defer cancel()
 
 	go func() {
-		err = client.Sync(ctx, info, func(msg *mgmtProto.SyncResponse) error {
+		err = client.Sync(ctx, info, 0, func(msg *mgmtProto.SyncResponse) error {
 			ch <- msg
 			return nil
 		})

shared/management/client/grpc.go

@@ -110,7 +110,7 @@ func (c *GrpcClient) ready() bool {
 
 // Sync wraps the real client's Sync endpoint call and takes care of retries and encryption/decryption of messages
 // Blocking request. The result will be sent via msgHandler callback function
-func (c *GrpcClient) Sync(ctx context.Context, sysInfo *system.Info, msgHandler func(msg *proto.SyncResponse) error) error {
+func (c *GrpcClient) Sync(ctx context.Context, sysInfo *system.Info, networkSerial uint64, msgHandler func(msg *proto.SyncResponse) error) error {
 	operation := func() error {
 		log.Debugf("management connection state %v", c.conn.GetState())
 		connState := c.conn.GetState()
@@ -128,7 +128,7 @@ func (c *GrpcClient) Sync(ctx context.Context, sysInfo *system.Info, msgHandler
 			return err
 		}
 
-		return c.handleStream(ctx, *serverPubKey, sysInfo, msgHandler)
+		return c.handleStream(ctx, *serverPubKey, sysInfo, networkSerial, msgHandler)
 	}
 
 	err := backoff.Retry(operation, defaultBackoff(ctx))
@@ -140,11 +140,11 @@ func (c *GrpcClient) Sync(ctx context.Context, sysInfo *system.Info, msgHandler
 }
 
 func (c *GrpcClient) handleStream(ctx context.Context, serverPubKey wgtypes.Key, sysInfo *system.Info,
-	msgHandler func(msg *proto.SyncResponse) error) error {
+	networkSerial uint64, msgHandler func(msg *proto.SyncResponse) error) error {
 	ctx, cancelStream := context.WithCancel(ctx)
 	defer cancelStream()
 
-	stream, err := c.connectToStream(ctx, serverPubKey, sysInfo)
+	stream, err := c.connectToStream(ctx, serverPubKey, sysInfo, networkSerial)
 	if err != nil {
 		log.Debugf("failed to open Management Service stream: %s", err)
 		if s, ok := gstatus.FromError(err); ok && s.Code() == codes.PermissionDenied {
@@ -186,7 +186,8 @@ func (c *GrpcClient) GetNetworkMap(sysInfo *system.Info) (*proto.NetworkMap, err
 
 	ctx, cancelStream := context.WithCancel(c.ctx)
 	defer cancelStream()
-	stream, err := c.connectToStream(ctx, *serverPubKey, sysInfo)
+	// GetNetworkMap doesn't have a serial to send, so we pass 0
+	stream, err := c.connectToStream(ctx, *serverPubKey, sysInfo, 0)
 	if err != nil {
 		log.Debugf("failed to open Management Service stream: %s", err)
 		return nil, err
@@ -219,8 +220,17 @@ func (c *GrpcClient) GetNetworkMap(sysInfo *system.Info) (*proto.NetworkMap, err
 	return decryptedResp.GetNetworkMap(), nil
 }
 
-func (c *GrpcClient) connectToStream(ctx context.Context, serverPubKey wgtypes.Key, sysInfo *system.Info) (proto.ManagementService_SyncClient, error) {
-	req := &proto.SyncRequest{Meta: infoToMetaData(sysInfo)}
+func (c *GrpcClient) connectToStream(ctx context.Context, serverPubKey wgtypes.Key, sysInfo *system.Info, networkSerial uint64) (proto.ManagementService_SyncClient, error) {
+	// Always compute latest system info to ensure up-to-date PeerSystemMeta on first and subsequent syncs
+	recomputed := system.GetInfo(c.ctx)
+	if sysInfo != nil {
+		recomputed.CopyFlagsFrom(sysInfo)
+		// carry over posture files if any were computed
+		if len(sysInfo.Files) > 0 {
+			recomputed.Files = sysInfo.Files
+		}
+	}
+	req := &proto.SyncRequest{Meta: infoToMetaData(recomputed), NetworkMapSerial: networkSerial}
 
 	myPrivateKey := c.key
 	myPublicKey := myPrivateKey.PublicKey()

shared/management/client/mock.go

@@ -12,7 +12,7 @@ import (
 
 type MockClient struct {
 	CloseFunc                      func() error
-	SyncFunc                       func(ctx context.Context, sysInfo *system.Info, msgHandler func(msg *proto.SyncResponse) error) error
+	SyncFunc                       func(ctx context.Context, sysInfo *system.Info, networkSerial uint64, msgHandler func(msg *proto.SyncResponse) error) error
 	GetServerPublicKeyFunc         func() (*wgtypes.Key, error)
 	RegisterFunc                   func(serverKey wgtypes.Key, setupKey string, jwtToken string, info *system.Info, sshKey []byte, dnsLabels domain.List) (*proto.LoginResponse, error)
 	LoginFunc                      func(serverKey wgtypes.Key, info *system.Info, sshKey []byte, dnsLabels domain.List) (*proto.LoginResponse, error)
@@ -33,11 +33,11 @@ func (m *MockClient) Close() error {
 	return m.CloseFunc()
 }
 
-func (m *MockClient) Sync(ctx context.Context, sysInfo *system.Info, msgHandler func(msg *proto.SyncResponse) error) error {
+func (m *MockClient) Sync(ctx context.Context, sysInfo *system.Info, networkSerial uint64, msgHandler func(msg *proto.SyncResponse) error) error {
 	if m.SyncFunc == nil {
 		return nil
 	}
-	return m.SyncFunc(ctx, sysInfo, msgHandler)
+	return m.SyncFunc(ctx, sysInfo, networkSerial, msgHandler)
 }
 
 func (m *MockClient) GetServerPublicKey() (*wgtypes.Key, error) {

shared/management/proto/management.pb.go

@@ -7,12 +7,13 @@
 package proto
 
 import (
+	reflect "reflect"
+	sync "sync"
+
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	durationpb "google.golang.org/protobuf/types/known/durationpb"
 	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
-	reflect "reflect"
-	sync "sync"
 )
 
 const (
@@ -343,6 +344,8 @@ type SyncRequest struct {
 
 	// Meta data of the peer
 	Meta *PeerSystemMeta `protobuf:"bytes,1,opt,name=meta,proto3" json:"meta,omitempty"`
+	// Optional: last known NetworkMap serial number on the client
+	NetworkMapSerial uint64 `protobuf:"varint,2,opt,name=networkMapSerial,proto3" json:"networkMapSerial,omitempty"`
 }
 
 func (x *SyncRequest) Reset() {
@@ -384,6 +387,13 @@ func (x *SyncRequest) GetMeta() *PeerSystemMeta {
 	return nil
 }
 
+func (x *SyncRequest) GetNetworkMapSerial() uint64 {
+	if x != nil {
+		return x.NetworkMapSerial
+	}
+	return 0
+}
+
 // SyncResponse represents a state that should be applied to the local peer (e.g. Netbird servers config as well as local peer and remote peers configs)
 type SyncResponse struct {
 	state         protoimpl.MessageState
@@ -402,6 +412,8 @@ type SyncResponse struct {
 	NetworkMap         *NetworkMap `protobuf:"bytes,5,opt,name=NetworkMap,proto3" json:"NetworkMap,omitempty"`
 	// Posture checks to be evaluated by client
 	Checks []*Checks `protobuf:"bytes,6,rep,name=Checks,proto3" json:"Checks,omitempty"`
+	// Indicates whether the client should skip updating the network map
+	SkipNetworkMapUpdate bool `protobuf:"varint,7,opt,name=skipNetworkMapUpdate,proto3" json:"skipNetworkMapUpdate,omitempty"`
 }
 
 func (x *SyncResponse) Reset() {
@@ -478,6 +490,13 @@ func (x *SyncResponse) GetChecks() []*Checks {
 	return nil
 }
 
+func (x *SyncResponse) GetSkipNetworkMapUpdate() bool {
+	if x != nil {
+		return x.SkipNetworkMapUpdate
+	}
+	return false
+}
+
 type SyncMetaRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3518,33 +3537,39 @@ var file_management_proto_rawDesc = []byte{
 	0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x77, 0x67, 0x50, 0x75, 0x62, 0x4b, 0x65, 0x79, 0x12,
 	0x12, 0x0a, 0x04, 0x62, 0x6f, 0x64, 0x79, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x04, 0x62,
 	0x6f, 0x64, 0x79, 0x12, 0x18, 0x0a, 0x07, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x18, 0x03,
-	0x20, 0x01, 0x28, 0x05, 0x52, 0x07, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x22, 0x3d, 0x0a,
+	0x20, 0x01, 0x28, 0x05, 0x52, 0x07, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x22, 0x69, 0x0a,
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shared/management/proto/management.proto

@@ -63,6 +63,8 @@ message EncryptedMessage {
 message SyncRequest {
   // Meta data of the peer
   PeerSystemMeta meta = 1;
+  // Optional: last known NetworkMap serial number on the client
+  uint64 networkMapSerial = 2;
 }
 
 // SyncResponse represents a state that should be applied to the local peer (e.g. Netbird servers config as well as local peer and remote peers configs)
@@ -85,6 +87,9 @@ message SyncResponse {
 
   // Posture checks to be evaluated by client
   repeated Checks Checks = 6;
+
+  // Indicates whether the client should skip updating the network map
+  bool skipNetworkMapUpdate = 7;
 }
 
 message  SyncMetaRequest {