193 lines
6.7 KiB
C
193 lines
6.7 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.0 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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/*****************************************************************************
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Source EmmDeregistered.c
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Version 0.1
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Date 2012/10/03
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Product NAS stack
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Subsystem EPS Mobility Management
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Author Frederic Maurel
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Description Implements the EPS Mobility Management procedures executed
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when the EMM-SAP is in EMM-DEREGISTERED state.
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In EMM-DEREGISTERED state, no EMM context has been established
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or the EMM context is marked as detached.
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The UE shall start the attach or combined attach procedure to
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establish an EMM context.
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The MME may answer to an attach or a combined attach procedure
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initiated by the UE. It may also answer to a tracking area
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updating procedure or combined tracking area updating procedure
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initiated by a UE if the EMM context is marked as detached.
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*****************************************************************************/
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#include "emm_fsm.h"
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#include "commonDef.h"
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#include "networkDef.h"
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#include "nas_log.h"
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#include "emm_proc.h"
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#include "user_defs.h"
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#include <assert.h>
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/****************************************************************************/
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/**************** E X T E R N A L D E F I N I T I O N S ****************/
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/****************************************************************************/
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/****************************************************************************/
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/******************* L O C A L D E F I N I T I O N S *******************/
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/****************************************************************************/
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/****************************************************************************/
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/****************** E X P O R T E D F U N C T I O N S ******************/
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/****************************************************************************/
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/****************************************************************************
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** **
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** Name: EmmDeregistered() **
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** **
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** Description: Handles the behaviour of the UE and the MME while the **
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** EMM-SAP is in EMM-DEREGISTERED state. **
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** **
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** 3GPP TS 24.301, section 5.2.2.2 **
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** **
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** Inputs: evt: The received EMM-SAP event **
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** Others: emm_fsm_status **
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** **
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** Outputs: None **
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** Return: RETURNok, RETURNerror **
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** Others: emm_fsm_status **
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** **
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***************************************************************************/
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int EmmDeregistered(nas_user_t *user, const emm_reg_t *evt)
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{
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LOG_FUNC_IN;
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int rc = RETURNerror;
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assert(emm_fsm_get_status(user) == EMM_DEREGISTERED);
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/* Delete the authentication data RAND and RES */
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// FIXME REVIEW
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rc = emm_proc_authentication_delete();
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if (rc != RETURNok) {
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LOG_FUNC_RETURN (rc);
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}
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/* TODO: 3GPP TS 24.301, section 4.4.2.1
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* The UE shall store the current native EPS security context as specified
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* in annex C and mark it as valid only when the UE enters state EMM-
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* DEREGISTERED from any other state except EMM-NULL or when the UE aborts
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* the attach procedure without having left EMM-DEREGISTERED.
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*/
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switch (evt->primitive) {
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case _EMMREG_NO_IMSI:
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/*
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* The UE was powered on without a valid USIM application present
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*/
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rc = emm_fsm_set_status(user, EMM_DEREGISTERED_NO_IMSI);
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break;
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case _EMMREG_REGISTER_REQ:
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/*
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* The default EMM primary substate when the UE is switched on
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* with valid USIM application shall be PLMN-SEARCH
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*/
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rc = emm_fsm_set_status(user, EMM_DEREGISTERED_PLMN_SEARCH);
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if (rc != RETURNerror) {
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/* Process the network registration request */
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rc = emm_fsm_process(user, evt);
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}
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break;
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case _EMMREG_ATTACH_INIT:
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/*
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* Attach procedure has to be restarted (timers T3402 or T3411
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* expired) while the UE locally detached from the network
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*/
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/* Move to the corresponding initial EMM state */
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if (evt->u.attach.is_emergency) {
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rc = emm_fsm_set_status(user, EMM_DEREGISTERED_LIMITED_SERVICE);
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} else {
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rc = emm_fsm_set_status(user, EMM_DEREGISTERED_NORMAL_SERVICE);
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}
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if (rc != RETURNerror) {
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/* Restart the attach procedure */
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rc = emm_proc_attach_restart(user);
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}
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break;
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case _EMMREG_LOWERLAYER_SUCCESS:
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/*
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* Data successfully delivered to the network
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*/
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rc = RETURNok;
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break;
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case _EMMREG_LOWERLAYER_FAILURE:
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/*
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* Data failed to be delivered to the network
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*/
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rc = RETURNok;
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break;
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default:
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LOG_TRACE(ERROR, "EMM-FSM - Primitive is not valid (%d)",
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evt->primitive);
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break;
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}
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/* TODO: 3GPP TS 24.301, section 4.4.2.1
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* The UE shall mark the EPS security context on the USIM or in the non-
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* volatile memory as invalid when the UE initiates an attach procedure
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* or when the UE leaves state EMM-DEREGISTERED for any other state except
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* EMM-NULL.
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*/
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LOG_FUNC_RETURN (rc);
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}
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/****************************************************************************/
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/********************* L O C A L F U N C T I O N S *********************/
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/****************************************************************************/
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