openairinterface5g/openair-cn/S1AP/s1ap_eNB_decoder.c

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  Eurecom OpenAirInterface
  Copyright(c) 1999 - 2012 Eurecom

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/*! \file s1ap_eNB_decoder.c
 * \brief s1ap pdu decode procedures for eNB
 * \author Sebastien ROUX <sebastien.roux@eurecom.fr>
 * \date 2013
 * \version 0.1
 */

#include <stdio.h>

#include "assertions.h"

#include "intertask_interface.h"

#include "s1ap_common.h"
#include "s1ap_ies_defs.h"
#include "s1ap_eNB_decoder.h"

static int s1ap_eNB_decode_initiating_message(s1ap_message *message,
    S1ap_InitiatingMessage_t *initiating_p)
{
    char message_string[10000];
    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:
            ret = s1ap_decode_s1ap_downlinknastransporties(
                &message->msg.s1ap_DownlinkNASTransportIEs, &initiating_p->value);
            s1ap_xer_print_s1ap_downlinknastransport(s1ap_xer__print2sp, message_string, message);
            break;

        case S1ap_ProcedureCode_id_InitialContextSetup:
            return s1ap_decode_s1ap_initialcontextsetuprequesties(
                &message->msg.s1ap_InitialContextSetupRequestIEs, &initiating_p->value);

        default:
            S1AP_DEBUG("Unknown procedure ID (%d) for initiating message\n",
                       (int)initiating_p->procedureCode);
            break;
    }
    return ret;
}

static int s1ap_eNB_decode_successful_outcome(s1ap_message *message,
    S1ap_SuccessfulOutcome_t *successfullOutcome_p)
{
    int ret = -1;
    MessageDef *message_p;
    char       *message_string = NULL;
    size_t      message_string_size;

    DevAssert(successfullOutcome_p != NULL);

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

    switch(successfullOutcome_p->procedureCode) {
        case S1ap_ProcedureCode_id_S1Setup:
            message_string = malloc(sizeof(char) * 10000);
            ret = s1ap_decode_s1ap_s1setupresponseies(
                &message->msg.s1ap_S1SetupResponseIEs, &successfullOutcome_p->value);
            s1ap_xer_print_s1ap_s1setupresponse(s1ap_xer__print2sp, message_string, message);
            break;
        default:
            S1AP_DEBUG("Unknown procedure ID (%d) for successfull outcome message\n",
                       (int)successfullOutcome_p->procedureCode);
            return -1;
    }

    message_string_size = strlen(message_string);

    message_p = itti_alloc_new_message_sized(TASK_S1AP, GENERIC_LOG, message_string_size);
    memcpy(&message_p->msg.generic_log, message_string, message_string_size);

    itti_send_msg_to_task(TASK_UNKNOWN, INSTANCE_DEFAULT, message_p);

    free(message_string);

    return ret;
}

static int s1ap_eNB_decode_unsuccessful_outcome(s1ap_message *message,
    S1ap_UnsuccessfulOutcome_t *unSuccessfullOutcome_p)
{
    int ret = -1;
    DevAssert(unSuccessfullOutcome_p != NULL);

    message->procedureCode = unSuccessfullOutcome_p->procedureCode;
    message->criticality   = unSuccessfullOutcome_p->criticality;

    switch(unSuccessfullOutcome_p->procedureCode) {
        case S1ap_ProcedureCode_id_S1Setup:
            return s1ap_decode_s1ap_s1setupfailureies(
                &message->msg.s1ap_S1SetupFailureIEs, &unSuccessfullOutcome_p->value);

        default:
            S1AP_DEBUG("Unknown procedure ID (%d) for unsuccessfull outcome message\n",
                       (int)unSuccessfullOutcome_p->procedureCode);
            break;
    }
    return ret;
}

int s1ap_eNB_decode_pdu(s1ap_message *message, const uint8_t * const buffer,
                        const uint32_t length)
{
    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,
                          length,
                          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_eNB_decode_initiating_message(message,
                    &pdu_p->choice.initiatingMessage);
        case S1AP_PDU_PR_successfulOutcome:
            return s1ap_eNB_decode_successful_outcome(message,
                    &pdu_p->choice.successfulOutcome);
        case S1AP_PDU_PR_unsuccessfulOutcome:
            return s1ap_eNB_decode_unsuccessful_outcome(message,
                    &pdu_p->choice.unsuccessfulOutcome);
        default:
            S1AP_DEBUG("Unknown presence (%d) or not implemented\n", (int)pdu_p->present);
            break;
    }
    return -1;
}