fix: second ue release uecontext without authetication

Author: donald1218

internal/context/amf_ran.go

@@ -63,6 +63,7 @@ func (ran *AmfRan) NewRanUe(ranUeNgapID int64) (*RanUe, error) {
 	ranUe.RanUeNgapId = ranUeNgapID
 	ranUe.Ran = ran
 	ranUe.Log = ran.Log
+	ranUe.FindAmfUe = nil
 	ranUe.UpdateLogFields()
 
 	if ranUeNgapID != RanUeNgapIdUnspecified {

internal/context/ran_ue.go

@@ -47,8 +47,9 @@ type RanUe struct {
 	LastActTime       *time.Time
 
 	/* Related Context*/
-	AmfUe *AmfUe
-	Ran   *AmfRan
+	AmfUe     *AmfUe
+	Ran       *AmfRan
+	FindAmfUe *AmfUe
 
 	/* Routing ID */
 	RoutingID string

internal/gmm/common/user_profile.go

@@ -69,6 +69,14 @@ func AttachRanUeToAmfUeAndReleaseOldIfAny(ue *context.AmfUe, ranUe *context.RanU
 	ue.AttachRanUe(ranUe)
 }
 
+func ClearHoldingRanUe(ranUe *context.RanUe) {
+	ranUe.DetachAmfUe()
+	ranUe.Log.Error("Clear Holding RanUE")
+	causeGroup := ngapType.CausePresentRadioNetwork
+	causeValue := ngapType.CauseRadioNetworkPresentReleaseDueToNgranGeneratedReason
+	ngap_message.SendUEContextReleaseCommand(ranUe, context.UeContextReleaseUeContext, causeGroup, causeValue)
+}
+
 func PurgeSubscriberData(ue *context.AmfUe, accessType models.AccessType) error {
 	logger.GmmLog.Debugln("PurgeSubscriberData")
 

internal/nas/handler.go

@@ -36,6 +36,11 @@ func HandleNAS(ue *amf_context.RanUe, procedureCode int64, nasPdu []byte, initia
 	ue.AmfUe.NasPduValue = nasPdu
 	ue.AmfUe.MacFailed = !integrityProtected
 
+	if ue.AmfUe.SecurityContextIsValid() && ue.FindAmfUe != nil {
+		gmm_common.ClearHoldingRanUe(ue.FindAmfUe.RanUe[ue.Ran.AnType])
+		ue.FindAmfUe = nil
+	}
+
 	if errDispatch := Dispatch(ue.AmfUe, ue.Ran.AnType, procedureCode, msg); errDispatch != nil {
 		ue.AmfUe.NASLog.Errorf("Handle NAS Error: %v", errDispatch)
 	}

internal/ngap/handler.go

@@ -498,7 +498,7 @@ func handleInitialUEMessageMain(ran *context.AmfRan,
 		// Described in TS 23.502 4.2.2.2.2 step 4 (without UDSF deployment)
 		ranUe.Log.Infof("find AmfUe [%q:%q]", idType, id)
 		ranUe.Log.Debugf("AmfUe Attach RanUe [RanUeNgapID: %d]", ranUe.RanUeNgapId)
-		gmm_common.AttachRanUeToAmfUeAndReleaseOldIfAny(amfUe, ranUe)
+		ranUe.FindAmfUe = amfUe
 	} else if regReqType != nasMessage.RegistrationType5GSInitialRegistration {
 		if regReqType == nasMessage.RegistrationType5GSPeriodicRegistrationUpdating ||
 			regReqType == nasMessage.RegistrationType5GSMobilityRegistrationUpdating {