openairinterface5g/openair-cn/S1AP/s1ap_mme_decoder.c

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  Eurecom OpenAirInterface
  Copyright(c) 1999 - 2012 Eurecom

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  the file called "COPYING".

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/*! \file s1ap_mme_decoder.c
 * \brief s1ap decode procedures for MME
 * \author Sebastien ROUX <sebastien.roux@eurecom.fr>
 * \date 2012
 * \version 0.1
 */

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>

#include "s1ap_common.h"
#include "s1ap_ies_defs.h"
#include "s1ap_mme_decoder.h"
#include "s1ap_mme_handlers.h"

#if !defined(MME_CLIENT_TEST)
# include "intertask_interface.h"
#endif

#include "assertions.h"

static int s1ap_mme_decode_initiating(
    s1ap_message *message, S1ap_InitiatingMessage_t *initiating_p)
{
    int ret = -1;

    DevAssert(initiating_p != NULL);

    message->procedureCode = initiating_p->procedureCode;
    message->criticality   = initiating_p->criticality;

    switch(initiating_p->procedureCode) {
//         case S1ap_ProcedureCode_id_downlinkNASTransport:
//             return s1ap_decode_downlinknastransporties(&message->msg.downlinkNASTransportIEs, &initiating_p->value);
        case S1ap_ProcedureCode_id_uplinkNASTransport: {
            ret = s1ap_decode_s1ap_uplinknastransporties(
                &message->msg.s1ap_UplinkNASTransportIEs, &initiating_p->value);
        } break;
        case S1ap_ProcedureCode_id_S1Setup: {
            ret = s1ap_decode_s1ap_s1setuprequesties(&message->msg.s1ap_S1SetupRequestIEs,
                                                &initiating_p->value);
//             s1ap_xer_print_s1ap_s1setuprequest(stdout, message);
        } break;
        case S1ap_ProcedureCode_id_initialUEMessage: {
            ret = s1ap_decode_s1ap_initialuemessageies(&message->msg.s1ap_InitialUEMessageIEs,
                                                  &initiating_p->value);
//             s1ap_xer_print_s1ap_initialuemessage(stdout, message);
        } break;
        case S1ap_ProcedureCode_id_UEContextReleaseRequest: {
            ret = s1ap_decode_s1ap_uecontextreleaserequesties(
                &message->msg.s1ap_UEContextReleaseRequestIEs, &initiating_p->value);
//             s1ap_xer_print_s1ap_uecontextreleaserequest(stdout, message);
        } break;
        case S1ap_ProcedureCode_id_UECapabilityInfoIndication: {
            ret = s1ap_decode_s1ap_uecapabilityinfoindicationies(
                &message->msg.s1ap_UECapabilityInfoIndicationIEs, &initiating_p->value);
//             s1ap_xer_print_s1ap_uecapabilityinfoindication(stdout, message);
        } break;
//         case S1ap_ProcedureCode_id_InitialContextSetup:
//             return s1ap_decode_initialcontextsetuprequesties(&message->msg.initialContextSetupRequestIEs, &initiating_p->value);
        default:
            S1AP_ERROR("Unknown procedure ID (%d) for initiating message\n",
                       (int)initiating_p->procedureCode);
            break;
    }
    return ret;
}

static int s1ap_mme_decode_successfull_outcome(
    s1ap_message *message, S1ap_SuccessfulOutcome_t *successfullOutcome_p)
{
    DevAssert(successfullOutcome_p != NULL);

    message->procedureCode = successfullOutcome_p->procedureCode;
    message->criticality   = successfullOutcome_p->criticality;

    switch(successfullOutcome_p->procedureCode) {
        case S1ap_ProcedureCode_id_InitialContextSetup:
            return s1ap_decode_s1ap_initialcontextsetupresponseies(
                       &message->msg.s1ap_InitialContextSetupResponseIEs, &successfullOutcome_p->value);
        case S1ap_ProcedureCode_id_UEContextRelease:
            return s1ap_decode_s1ap_uecontextreleasecompleteies(
                       &message->msg.s1ap_UEContextReleaseCompleteIEs, &successfullOutcome_p->value);
        default:
            S1AP_ERROR("Unknown procedure ID (%d) for successfull outcome message\n",
                       (int)successfullOutcome_p->procedureCode);
            break;
    }
    return -1;
}

static int s1ap_mme_decode_unsuccessfull_outcome(
    s1ap_message *message, S1ap_UnsuccessfulOutcome_t *unSuccessfulOutcome_p)
{
    DevAssert(unSuccessfulOutcome_p != NULL);

    message->procedureCode = unSuccessfulOutcome_p->procedureCode;
    message->criticality   = unSuccessfulOutcome_p->criticality;

    switch(unSuccessfulOutcome_p->procedureCode) {
        case S1ap_ProcedureCode_id_InitialContextSetup:
            return s1ap_decode_s1ap_initialcontextsetupfailureies(
                       &message->msg.s1ap_InitialContextSetupFailureIEs, &unSuccessfulOutcome_p->value);
        default:
            S1AP_ERROR("Unknown procedure ID (%d) for unsuccessfull outcome message\n",
                       (int)unSuccessfulOutcome_p->procedureCode);
            break;
    }
    return -1;
}

int s1ap_mme_decode_pdu(s1ap_message *message, uint8_t *buffer, uint32_t len)
{
    S1AP_PDU_t  pdu;
    S1AP_PDU_t *pdu_p = &pdu;
    asn_dec_rval_t dec_ret;

    DevAssert(buffer != NULL);

    memset((void *)pdu_p, 0, sizeof(S1AP_PDU_t));

    dec_ret = aper_decode(NULL,
                          &asn_DEF_S1AP_PDU,
                          (void **)&pdu_p,
                          buffer,
                          len,
                          0,
                          0);

    if (dec_ret.code != RC_OK) {
        S1AP_ERROR("Failed to decode PDU\n");
        return -1;
    }

    message->direction = pdu_p->present;

    switch(pdu_p->present) {
        case S1AP_PDU_PR_initiatingMessage:
            return s1ap_mme_decode_initiating(message, &pdu_p->choice.initiatingMessage);
        case S1AP_PDU_PR_successfulOutcome:
            return s1ap_mme_decode_successfull_outcome(message,
                    &pdu_p->choice.successfulOutcome);
        case S1AP_PDU_PR_unsuccessfulOutcome:
            return s1ap_mme_decode_unsuccessfull_outcome(message,
                    &pdu_p->choice.unsuccessfulOutcome);
        default:
            S1AP_ERROR("Unknown message outcome (%d) or not implemented",
                       (int)pdu_p->present);
            break;
    }
    return -1;
}