189 lines
7.5 KiB
C
189 lines
7.5 KiB
C
/*******************************************************************************
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OpenAirInterface
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Copyright(c) 1999 - 2014 Eurecom
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OpenAirInterface is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenAirInterface is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OpenAirInterface.The full GNU General Public License is
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included in this distribution in the file called "COPYING". If not,
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see <http://www.gnu.org/licenses/>.
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Contact Information
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OpenAirInterface Admin: openair_admin@eurecom.fr
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OpenAirInterface Tech : openair_tech@eurecom.fr
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OpenAirInterface Dev : openair4g-devel@eurecom.fr
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Address : Eurecom, Compus SophiaTech 450, route des chappes, 06451 Biot, France.
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*******************************************************************************/
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/*****************************************************************************
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Source TrackingAreaUpdate.c
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Version 0.1
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Date 2013/05/07
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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 Defines the tracking area update EMM procedure executed by the
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Non-Access Stratum.
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The tracking area updating procedure is always initiated by the
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UE and is used to update the registration of the actual tracking
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area of a UE in the network, to periodically notify the availa-
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bility of the UE to the network, for MME load balancing, to up-
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date certain UE specific parameters in the network.
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*****************************************************************************/
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#include "emm_proc.h"
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#include "nas_log.h"
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#include "nas_timer.h"
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#include "emmData.h"
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#include "emm_sap.h"
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#include "emm_cause.h"
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#include <string.h> // memcmp, memcpy
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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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* --------------------------------------------------------------------------
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* Internal data handled by the tracking area update procedure in the MME
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* --------------------------------------------------------------------------
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*/
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static int _emm_tracking_area_update_reject(void *args);
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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: emm_proc_tracking_area_update_reject() **
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** **
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** Description: **
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** **
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** Inputs: ueid: UE lower layer identifier **
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** emm_cause: EMM cause code to be reported **
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** Others: None **
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** **
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** Outputs: None **
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** Return: RETURNok, RETURNerror **
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** Others: _emm_data **
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** **
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***************************************************************************/
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int emm_proc_tracking_area_update_reject(unsigned int ueid, int emm_cause)
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{
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LOG_FUNC_IN;
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int rc;
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/* Create temporary UE context */
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emm_data_context_t ue_ctx;
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memset(&ue_ctx, 0 , sizeof(emm_data_context_t));
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ue_ctx.is_dynamic = FALSE;
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ue_ctx.ueid = ueid;
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/* Update the EMM cause code */
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#if defined(NAS_BUILT_IN_EPC)
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if (ueid > 0)
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#else
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if (ueid < EMM_DATA_NB_UE_MAX)
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#endif
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{
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ue_ctx.emm_cause = emm_cause;
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} else {
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ue_ctx.emm_cause = EMM_CAUSE_ILLEGAL_UE;
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}
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/* Do not accept attach request with protocol error */
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rc = _emm_tracking_area_update_reject(&ue_ctx);
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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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/****************************************************************************
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** **
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** Name: _emm_tracking_area_update_reject() **
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** **
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** Description: Performs the tracking area update procedure not accepted **
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** by the network. **
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** **
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** Inputs: args: UE context data **
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** Others: None **
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** **
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** Outputs: None **
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** Return: RETURNok, RETURNerror **
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** Others: None **
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** **
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***************************************************************************/
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static int _emm_tracking_area_update_reject(void *args)
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{
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LOG_FUNC_IN;
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int rc = RETURNerror;
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emm_data_context_t *emm_ctx = (emm_data_context_t *)(args);
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if (emm_ctx) {
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emm_sap_t emm_sap;
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LOG_TRACE(WARNING, "EMM-PROC - EMM tracking area update procedure not accepted "
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"by the network (ueid=%08x, cause=%d)",
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emm_ctx->ueid, emm_ctx->emm_cause);
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/*
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* Notify EMM-AS SAP that Tracking Area Update Reject message has to be sent
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* onto the network
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*/
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emm_sap.primitive = EMMAS_ESTABLISH_REJ;
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emm_sap.u.emm_as.u.establish.ueid = emm_ctx->ueid;
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emm_sap.u.emm_as.u.establish.UEid.guti = NULL;
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if (emm_ctx->emm_cause == EMM_CAUSE_SUCCESS) {
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emm_ctx->emm_cause = EMM_CAUSE_ILLEGAL_UE;
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}
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emm_sap.u.emm_as.u.establish.emm_cause = emm_ctx->emm_cause;
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emm_sap.u.emm_as.u.establish.NASinfo = EMM_AS_NAS_INFO_TAU;
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emm_sap.u.emm_as.u.establish.NASmsg.length = 0;
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emm_sap.u.emm_as.u.establish.NASmsg.value = NULL;
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/* Setup EPS NAS security data */
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emm_as_set_security_data(&emm_sap.u.emm_as.u.establish.sctx,
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emm_ctx->security, FALSE, TRUE);
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rc = emm_sap_send(&emm_sap);
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}
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LOG_FUNC_RETURN(rc);
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}
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