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/*******************************************************************************
OpenAirInterface
Copyright(c) 1999 - 2014 Eurecom
OpenAirInterface is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenAirInterface is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with OpenAirInterface.The full GNU General Public License is
included in this distribution in the file called "COPYING". If not,
see <http://www.gnu.org/licenses/>.
Contact Information
OpenAirInterface Admin: openair_admin@eurecom.fr
OpenAirInterface Tech : openair_tech@eurecom.fr
OpenAirInterface Dev : openair4g-devel@eurecom.fr
Address : Eurecom, Compus SophiaTech 450, route des chappes, 06451 Biot, France.
*******************************************************************************/
/*****************************************************************************
Source DedicatedEpsBearerContextActivation.c
Version 0.1
Date 2013/07/16
Product NAS stack
Subsystem EPS Session Management
Author Frederic Maurel
Description Defines the dedicated EPS bearer context activation ESM
procedure executed by the Non-Access Stratum.
The purpose of the dedicated EPS bearer context activation
procedure is to establish an EPS bearer context with specific
QoS and TFT between the UE and the EPC.
The procedure is initiated by the network, but may be requested
by the UE by means of the UE requested bearer resource alloca-
tion procedure or the UE requested bearer resource modification
procedure.
It can be part of the attach procedure or be initiated together
with the default EPS bearer context activation procedure when
the UE initiated stand-alone PDN connectivity procedure.
*****************************************************************************/
#include "esm_proc.h"
#include "commonDef.h"
#include "nas_log.h"
#include "esm_cause.h"
#include "esm_ebr.h"
#include "esm_ebr_context.h"
#include "emm_sap.h"
/****************************************************************************/
/**************** E X T E R N A L D E F I N I T I O N S ****************/
/****************************************************************************/
/****************************************************************************/
/******************* L O C A L D E F I N I T I O N S *******************/
/****************************************************************************/
/****************************************************************************/
/****************** E X P O R T E D F U N C T I O N S ******************/
/****************************************************************************/
/*
* --------------------------------------------------------------------------
* Dedicated EPS bearer context activation procedure executed by the MME
* --------------------------------------------------------------------------
*/
/*
* --------------------------------------------------------------------------
* Dedicated EPS bearer context activation procedure executed by the UE
* --------------------------------------------------------------------------
*/
/****************************************************************************
** **
** Name: esm_proc_dedicated_eps_bearer_context_request() **
** **
** Description: Creates local dedicated EPS bearer context upon receipt **
** of the ACTIVATE DEDICATED EPS BEARER CONTEXT REQUEST **
** message. **
** **
** Inputs: ebi: EPS bearer identity **
** default_ebi: EPS bearer identity of the associated de- **
** fault EPS bearer context **
** esm_qos: EPS bearer level QoS parameters **
** tft: Traffic flow template parameters **
** Others: None **
** **
** Outputs: esm_cause: Cause code returned upon ESM procedure **
** failure **
** Return: RETURNok, RETURNerror **
** Others: None **
** **
***************************************************************************/
int esm_proc_dedicated_eps_bearer_context_request(int ebi, int default_ebi,
const esm_proc_qos_t *qos,
const esm_proc_tft_t *tft,
int *esm_cause)
{
LOG_FUNC_IN;
int rc = RETURNerror;
LOG_TRACE(INFO, "ESM-PROC - Dedicated EPS bearer context activation "
"requested by the network (ebi=%d)", ebi);
/* Get the PDN connection the dedicated EPS bearer is linked to */
int pid = esm_ebr_context_get_pid(default_ebi);
if (pid < 0) {
/* 3GPP TS 24.301, section 6.4.2.5, abnormal case c
* No default EPS bearer context with linked EPS bearer identity
* activated
*/
LOG_TRACE(WARNING, "ESM-PROC - Failed to get PDN connection the "
"dedicated EPS bearer is linked to (ebi=%d)", default_ebi);
*esm_cause = ESM_CAUSE_INVALID_EPS_BEARER_IDENTITY;
LOG_FUNC_RETURN (RETURNerror);
}
/* Assign dedicated EPS bearer context */
int new_ebi = esm_ebr_assign(ebi, pid+1, FALSE);
if (new_ebi == ESM_EBI_UNASSIGNED) {
/* 3GPP TS 24.301, section 6.4.2.5, abnormal cases a and b
* Dedicated EPS bearer context activation request for an already
* activated default or dedicated EPS bearer context
*/
int old_pid, old_bid;
/* Locally deactivate the existing EPS bearer context and proceed
* with the requested dedicated EPS bearer context activation */
rc = esm_proc_eps_bearer_context_deactivate(TRUE, ebi,
&old_pid, &old_bid);
if (rc != RETURNok) {
/* Failed to release EPS bearer context */
*esm_cause = ESM_CAUSE_PROTOCOL_ERROR;
} else {
/* Assign new dedicated EPS bearer context */
ebi = esm_ebr_assign(ebi, pid+1, FALSE);
}
}
if (ebi != ESM_EBI_UNASSIGNED) {
/* Check syntactical errors in packet filters */
rc = esm_ebr_context_check_tft(pid, ebi, tft,
ESM_EBR_CONTEXT_TFT_CREATE);
if (rc != RETURNok) {
/* Syntactical errors in packet filters */
LOG_TRACE(WARNING, "ESM-PROC - Syntactical errors in packet "
"filters");
*esm_cause = ESM_CAUSE_SYNTACTICAL_ERROR_IN_PACKET_FILTER;
} else {
/* Create new dedicated EPS bearer context */
default_ebi = esm_ebr_context_create(pid, ebi, FALSE, qos, tft);
if (default_ebi != ESM_EBI_UNASSIGNED) {
/* Dedicated EPS bearer contextx successfully created */
rc = RETURNok;
} else {
/* No resource available */
LOG_TRACE(WARNING, "ESM-PROC - Failed to create new dedicated "
"EPS bearer context");
*esm_cause = ESM_CAUSE_INSUFFICIENT_RESOURCES;
}
}
}
LOG_FUNC_RETURN (rc);
}
/****************************************************************************
** **
** Name: esm_proc_dedicated_eps_bearer_context_accept() **
** **
** Description: Performs dedicated EPS bearer context activation proce- **
** dure accepted by the UE. **
** **
** 3GPP TS 24.301, section 6.4.2.3 **
** The UE accepts dedicated EPS bearer context activation by **
** sending ACTIVATE DEDICATED EPS BEARER CONTEXT ACCEPT mes- **
** sage and entering the state BEARER CONTEXT ACTIVE. **
** **
** Inputs: is_standalone: Not used **
** ebi: EPS bearer identity **
** msg: Encoded ESM message to be sent **
** ue_triggered: TRUE if the EPS bearer context procedure **
** was triggered by the UE **
** Others: None **
** **
** Outputs: None **
** Return: RETURNok, RETURNerror **
** Others: None **
** **
***************************************************************************/
int esm_proc_dedicated_eps_bearer_context_accept(int is_standalone, int ebi,
OctetString *msg, int ue_triggered)
{
LOG_FUNC_IN;
int rc;
LOG_TRACE(INFO,"ESM-PROC - Dedicated EPS bearer context activation "
"accepted by the UE (ebi=%d)", ebi);
emm_sap_t emm_sap;
emm_esm_data_t *emm_esm = &emm_sap.u.emm_esm.u.data;
/*
* Notity EMM that ESM PDU has to be forwarded to lower layers
*/
emm_sap.primitive = EMMESM_UNITDATA_REQ;
emm_sap.u.emm_esm.ueid = 0;
emm_esm->msg.length = msg->length;
emm_esm->msg.value = msg->value;
rc = emm_sap_send(&emm_sap);
if (rc != RETURNerror) {
/* Set the EPS bearer context state to ACTIVE */
rc = esm_ebr_set_status(ebi, ESM_EBR_ACTIVE, ue_triggered);
if (rc != RETURNok) {
/* The EPS bearer context was already in ACTIVE state */
LOG_TRACE(WARNING, "ESM-PROC - EBI %d was already ACTIVE", ebi);
/* Accept network retransmission of already accepted activate
* dedicated EPS bearer context request */
LOG_FUNC_RETURN (RETURNok);
}
}
LOG_FUNC_RETURN (rc);
}
/****************************************************************************
** **
** Name: esm_proc_dedicated_eps_bearer_context_reject() **
** **
** Description: Performs dedicated EPS bearer context activation proce- **
** dure not accepted by the UE. **
** **
** 3GPP TS 24.301, section 6.4.2.4 **
** The UE rejects dedicated EPS bearer context activation by **
** sending ACTIVATE DEDICATED EPS BEARER CONTEXT REJECT mes- **
** sage. **
** **
** Inputs: is_standalone: Not used **
** ebi: EPS bearer identity **
** msg: Encoded ESM message to be sent **
** ue_triggered: Not used **
** Others: None **
** **
** Outputs: None **
** Return: RETURNok, RETURNerror **
** Others: None **
** **
***************************************************************************/
int esm_proc_dedicated_eps_bearer_context_reject(int is_standalone, int ebi,
OctetString *msg, int ue_triggered)
{
LOG_FUNC_IN;
int rc = RETURNok;
LOG_TRACE(WARNING, "ESM-PROC - Dedicated EPS bearer context activation "
"not accepted by the UE (ebi=%d)", ebi);
if ( !esm_ebr_is_not_in_use(ebi) ) {
/* Release EPS bearer data currently in use */
rc = esm_ebr_release(ebi);
}
if (rc != RETURNok) {
LOG_TRACE(WARNING, "ESM-PROC - Failed to release EPS bearer data");
} else {
emm_sap_t emm_sap;
emm_esm_data_t *emm_esm = &emm_sap.u.emm_esm.u.data;
/*
* Notity EMM that ESM PDU has to be forwarded to lower layers
*/
emm_sap.primitive = EMMESM_UNITDATA_REQ;
emm_sap.u.emm_esm.ueid = 0;
emm_esm->msg.length = msg->length;
emm_esm->msg.value = msg->value;
rc = emm_sap_send(&emm_sap);
}
LOG_FUNC_RETURN (rc);
}
/****************************************************************************/
/********************* L O C A L F U N C T I O N S *********************/
/****************************************************************************/
/*
* --------------------------------------------------------------------------
* Timer handlers
* --------------------------------------------------------------------------
*/