/****************************************************************************
** **
** Name: emm_reg_send() **
** **
** Description: Processes the EMMREG Service Access Point primitive **
** **
** Inputs: msg: The EMMREG-SAP primitive to process **
** Others: None **
** **
** Outputs: None **
** Return: RETURNok, RETURNerror **
** Others: None **
** **
***************************************************************************/
int emm_reg_send(const emm_reg_t *msg)
{
LOG_FUNC_IN;
int rc;
/* Check the EMM-SAP primitive */
emm_reg_primitive_t primitive = msg->primitive;
assert( (primitive > _EMMREG_START) && (primitive < _EMMREG_END));
/* Execute the EMM procedure */
rc = emm_fsm_process(msg);
LOG_FUNC_RETURN (rc);
}
/****************************************************************************
** **
** Name: EmmDeregisteredNormalService() **
** **
** Description: Handles the behaviour of the UE while the EMM-SAP is in **
** EMM-DEREGISTERED.NORMAL-SERVICE state. **
** **
** 3GPP TS 24.301, section 5.2.2.3.1 **
** The UE shall initiate an attach or combined attach proce- **
** dure. **
** **
** Inputs: evt: The received EMM-SAP event **
** Others: emm_fsm_status **
** **
** Outputs: None **
** Return: RETURNok, RETURNerror **
** Others: emm_fsm_status **
** **
***************************************************************************/
int EmmDeregisteredNormalService(const emm_reg_t *evt)
{
LOG_FUNC_IN;
int rc = RETURNerror;
assert(emm_fsm_get_status() == EMM_DEREGISTERED_NORMAL_SERVICE);
switch (evt->primitive) {
case _EMMREG_REGISTER_REQ:
/*
* The user manually re-selected a PLMN to register to
*/
rc = emm_fsm_set_status(EMM_DEREGISTERED_PLMN_SEARCH);
if (rc != RETURNerror) {
/* Process the network registration request */
rc = emm_fsm_process(evt);
}
break;
case _EMMREG_ATTACH_INIT:
/*
* Initiate the attach procedure for EPS services
*/
rc = emm_proc_attach(EMM_ATTACH_TYPE_EPS);
break;
case _EMMREG_ATTACH_REQ:
/*
* An EPS network attach has been requested (Attach Request
* message successfully delivered to the network);
* enter state EMM-REGISTERED-INITIATED
*/
rc = emm_fsm_set_status(EMM_REGISTERED_INITIATED);
break;
case _EMMREG_LOWERLAYER_SUCCESS:
/*
* Initial NAS message has been successfully delivered
* to the network
*/
rc = emm_proc_lowerlayer_success();
break;
case _EMMREG_LOWERLAYER_FAILURE:
/*
* Initial NAS message failed to be delivered to the network
*/
rc = emm_proc_lowerlayer_failure(TRUE);
break;
case _EMMREG_LOWERLAYER_RELEASE:
/*
* NAS signalling connection has been released
*/
rc = emm_proc_lowerlayer_release();
break;
case _EMMREG_ATTACH_CNF:
/*
* Attach procedure successful and default EPS bearer
* context activated;
* enter state EMM-REGISTERED.
*/
rc = emm_fsm_set_status(EMM_REGISTERED);
break;
default:
LOG_TRACE(ERROR, "EMM-FSM - Primitive is not valid (%d)",
evt->primitive);
break;
}
LOG_FUNC_RETURN (rc);
}
/****************************************************************************
** **
** Name: EmmRegisteredInitiated() **
** **
** Description: Handles the behaviour of the UE while the EMM-SAP is in **
** EMM-REGISTERED-INITIATED state. **
** **
** Inputs: evt: The received EMM-SAP event **
** Others: emm_fsm_status **
** **
** Outputs: None **
** Return: RETURNok, RETURNerror **
** Others: emm_fsm_status **
** **
***************************************************************************/
int EmmRegisteredInitiated(const emm_reg_t *evt)
{
LOG_FUNC_IN;
int rc = RETURNerror;
assert(emm_fsm_get_status() == EMM_REGISTERED_INITIATED);
switch (evt->primitive) {
case _EMMREG_ATTACH_INIT:
/*
* Attach procedure has to be restarted (timers T3402 or T3411
* expired)
*/
/* Move to the corresponding initial EMM state */
if (evt->u.attach.is_emergency) {
rc = emm_fsm_set_status(EMM_DEREGISTERED_LIMITED_SERVICE);
} else {
rc = emm_fsm_set_status(EMM_DEREGISTERED_NORMAL_SERVICE);
}
if (rc != RETURNerror) {
/* Restart the attach procedure */
rc = emm_proc_attach_restart();
}
break;
case _EMMREG_ATTACH_FAILED:
/*
* Attempt to attach to the network failed (abnormal case or
* timer T3410 expired). The network attach procedure shall be
* restarted when timer T3411 expires.
*/
rc = emm_fsm_set_status(EMM_DEREGISTERED_ATTEMPTING_TO_ATTACH);
break;
case _EMMREG_ATTACH_EXCEEDED:
/*
* Attempt to attach to the network failed (abnormal case or
* timer T3410 expired) and the attach attempt counter reached
* its maximum value. The state is changed to EMM-DEREGISTERED.
* ATTEMPTING-TO-ATTACH or optionally to EMM-DEREGISTERED.PLMN-
* SEARCH in order to perform a PLMN selection.
*/
/* TODO: ATTEMPTING-TO-ATTACH or PLMN-SEARCH ??? */
rc = emm_fsm_set_status(EMM_DEREGISTERED_ATTEMPTING_TO_ATTACH);
break;
case _EMMREG_ATTACH_CNF:
/*
* EPS network attach accepted by the network;
* enter state EMM-REGISTERED.
*/
rc = emm_fsm_set_status(EMM_REGISTERED);
if (rc != RETURNerror) {
/*
* Notify EMM that the MT is registered
*/
rc = emm_proc_registration_notify(NET_REG_STATE_HN);
if (rc != RETURNok) {
LOG_TRACE(WARNING, "EMM-FSM - "
"Failed to notify registration update");
}
}
break;
case _EMMREG_AUTH_REJ:
/*
* UE authentication rejected by the network;
* abort any EMM signalling procedure
*/
case _EMMREG_ATTACH_REJ:
/*
* EPS network attach rejected by the network;
* enter state EMM-DEREGISTERED.
*/
rc = emm_fsm_set_status(EMM_DEREGISTERED);
if (rc != RETURNerror) {
/*
* Notify EMM that the MT's registration is denied
*/
rc = emm_proc_registration_notify(NET_REG_STATE_DENIED);
if (rc != RETURNok) {
LOG_TRACE(WARNING, "EMM-FSM - "
"Failed to notify registration update");
}
}
break;
case _EMMREG_REGISTER_REQ:
/*
* The UE has to select a new PLMN to register to
*/
rc = emm_fsm_set_status(EMM_DEREGISTERED_PLMN_SEARCH);
if (rc != RETURNerror) {
/* Process the network registration request */
rc = emm_fsm_process(evt);
}
break;
case _EMMREG_REGISTER_REJ:
/*
* The UE failed to register to the network for normal EPS service
*/
rc = emm_fsm_set_status(EMM_DEREGISTERED_LIMITED_SERVICE);
break;
case _EMMREG_NO_IMSI:
/*
* The UE failed to register to the network for emergency
* bearer services
*/
rc = emm_fsm_set_status(EMM_DEREGISTERED_NO_IMSI);
break;
case _EMMREG_DETACH_INIT:
/*
* Initiate detach procedure for EPS services
*/
rc = emm_proc_detach(EMM_DETACH_TYPE_EPS, evt->u.detach.switch_off);
break;
case _EMMREG_DETACH_REQ:
/*
* An EPS network detach has been requested (Detach Request
* message successfully delivered to the network);
* enter state EMM-DEREGISTERED-INITIATED
*/
rc = emm_fsm_set_status(EMM_DEREGISTERED_INITIATED);
break;
case _EMMREG_LOWERLAYER_SUCCESS:
/*
* Data transfer message has been successfully delivered;
* The NAS message may be Attach Complete, Detach Request or
* any message transfered by EMM common procedures requested
* by the network.
*/
rc = emm_proc_lowerlayer_success();
break;
case _EMMREG_LOWERLAYER_FAILURE:
/*
* Data transfer message failed to be delivered;
* The NAS message may be Attach Complete, Detach Request or
* any message transfered by EMM common procedures requested
* by the network.
*/
rc = emm_proc_lowerlayer_failure(FALSE);
break;
case _EMMREG_LOWERLAYER_RELEASE:
/*
* NAS signalling connection has been released before the Attach
* Accept, Attach Reject, or any message transfered by EMM common
* procedures requested by the network, is received.
*/
rc = emm_proc_lowerlayer_release();
break;
default:
LOG_TRACE(ERROR, "EMM-FSM - Primitive is not valid (%d)",
evt->primitive);
break;
}
LOG_FUNC_RETURN (rc);
}
/****************************************************************************
** **
** Name: EmmDeregistered() **
** **
** Description: Handles the behaviour of the UE and the MME while the **
** EMM-SAP is in EMM-DEREGISTERED state. **
** **
** 3GPP TS 24.301, section 5.2.2.2 **
** **
** Inputs: evt: The received EMM-SAP event **
** Others: emm_fsm_status **
** **
** Outputs: None **
** Return: RETURNok, RETURNerror **
** Others: emm_fsm_status **
** **
***************************************************************************/
int EmmDeregistered(const emm_reg_t *evt)
{
LOG_FUNC_IN;
int rc = RETURNerror;
#ifdef NAS_UE
assert(emm_fsm_get_status() == EMM_DEREGISTERED);
#endif
#ifdef NAS_MME
assert(emm_fsm_get_status(evt->ueid, evt->ctx) == EMM_DEREGISTERED);
#endif
#ifdef NAS_UE
/* Delete the authentication data RAND and RES */
rc = emm_proc_authentication_delete();
if (rc != RETURNok) {
LOG_FUNC_RETURN (rc);
}
/* TODO: 3GPP TS 24.301, section 4.4.2.1
* The UE shall store the current native EPS security context as specified
* in annex C and mark it as valid only when the UE enters state EMM-
* DEREGISTERED from any other state except EMM-NULL or when the UE aborts
* the attach procedure without having left EMM-DEREGISTERED.
*/
#endif
switch (evt->primitive) {
#ifdef NAS_UE
case _EMMREG_NO_IMSI:
/*
* The UE was powered on without a valid USIM application present
*/
rc = emm_fsm_set_status(EMM_DEREGISTERED_NO_IMSI);
break;
case _EMMREG_REGISTER_REQ:
/*
* The default EMM primary substate when the UE is switched on
* with valid USIM application shall be PLMN-SEARCH
*/
rc = emm_fsm_set_status(EMM_DEREGISTERED_PLMN_SEARCH);
if (rc != RETURNerror) {
/* Process the network registration request */
rc = emm_fsm_process(evt);
}
break;
case _EMMREG_ATTACH_INIT:
/*
* Attach procedure has to be restarted (timers T3402 or T3411
* expired) while the UE locally detached from the network
*/
/* Move to the corresponding initial EMM state */
if (evt->u.attach.is_emergency) {
rc = emm_fsm_set_status(EMM_DEREGISTERED_LIMITED_SERVICE);
} else {
rc = emm_fsm_set_status(EMM_DEREGISTERED_NORMAL_SERVICE);
}
if (rc != RETURNerror) {
/* Restart the attach procedure */
rc = emm_proc_attach_restart();
}
break;
#endif
#ifdef NAS_MME
case _EMMREG_PROC_ABORT:
/*
* Ongoing EMM procedure aborted
*/
rc = RETURNok;
break;
case _EMMREG_COMMON_PROC_REQ:
/*
* An EMM common procedure has been initiated;
* enter state EMM-COMMON-PROCEDURE-INITIATED.
*/
rc = emm_fsm_set_status(evt->ueid, evt->ctx, EMM_COMMON_PROCEDURE_INITIATED);
break;
case _EMMREG_ATTACH_CNF:
/*
* Attach procedure successful and default EPS bearer
* context activated;
* enter state EMM-REGISTERED.
*/
rc = emm_fsm_set_status(evt->ueid, evt->ctx, EMM_REGISTERED);
break;
#endif
case _EMMREG_LOWERLAYER_SUCCESS:
/*
* Data successfully delivered to the network
*/
rc = RETURNok;
break;
case _EMMREG_LOWERLAYER_FAILURE:
/*
* Data failed to be delivered to the network
*/
rc = RETURNok;
break;
default:
LOG_TRACE(ERROR, "EMM-FSM - Primitive is not valid (%d)",
evt->primitive);
break;
}
#ifdef NAS_UE
/* TODO: 3GPP TS 24.301, section 4.4.2.1
* The UE shall mark the EPS security context on the USIM or in the non-
* volatile memory as invalid when the UE initiates an attach procedure
* or when the UE leaves state EMM-DEREGISTERED for any other state except
* EMM-NULL.
*/
#endif
LOG_FUNC_RETURN (rc);
}