openairinterface5g/openair3/NAS/COMMON/EMM/MSG/EmmInformation.c

/*
 * Copyright (c) 2015, EURECOM (www.eurecom.fr)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are those
 * of the authors and should not be interpreted as representing official policies,
 * either expressed or implied, of the FreeBSD Project.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>


#include "TLVEncoder.h"
#include "TLVDecoder.h"
#include "EmmInformation.h"

int decode_emm_information(emm_information_msg *emm_information, uint8_t *buffer, uint32_t len)
{
  uint32_t decoded = 0;
  int decoded_result = 0;

  // Check if we got a NULL pointer and if buffer length is >= minimum length expected for the message.
  CHECK_PDU_POINTER_AND_LENGTH_DECODER(buffer, EMM_INFORMATION_MINIMUM_LENGTH, len);

  /* Decoding mandatory fields */
  /* Decoding optional fields */
  while(len - decoded > 0) {
    uint8_t ieiDecoded = *(buffer + decoded);

    /* Type | value iei are below 0x80 so just return the first 4 bits */
    if (ieiDecoded >= 0x80)
      ieiDecoded = ieiDecoded & 0xf0;

    switch(ieiDecoded) {
    case EMM_INFORMATION_FULL_NAME_FOR_NETWORK_IEI:
      if ((decoded_result =
             decode_network_name(&emm_information->fullnamefornetwork,
                                 EMM_INFORMATION_FULL_NAME_FOR_NETWORK_IEI, buffer +
                                 decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      emm_information->presencemask |= EMM_INFORMATION_FULL_NAME_FOR_NETWORK_PRESENT;
      break;

    case EMM_INFORMATION_SHORT_NAME_FOR_NETWORK_IEI:
      if ((decoded_result =
             decode_network_name(&emm_information->shortnamefornetwork,
                                 EMM_INFORMATION_SHORT_NAME_FOR_NETWORK_IEI, buffer +
                                 decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      emm_information->presencemask |= EMM_INFORMATION_SHORT_NAME_FOR_NETWORK_PRESENT;
      break;

    case EMM_INFORMATION_LOCAL_TIME_ZONE_IEI:
      if ((decoded_result =
             decode_time_zone(&emm_information->localtimezone,
                              EMM_INFORMATION_LOCAL_TIME_ZONE_IEI, buffer + decoded, len
                              - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      emm_information->presencemask |= EMM_INFORMATION_LOCAL_TIME_ZONE_PRESENT;
      break;

    case EMM_INFORMATION_UNIVERSAL_TIME_AND_LOCAL_TIME_ZONE_IEI:
      if ((decoded_result =
             decode_time_zone_and_time(&emm_information->universaltimeandlocaltimezone,
                                       EMM_INFORMATION_UNIVERSAL_TIME_AND_LOCAL_TIME_ZONE_IEI,
                                       buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      emm_information->presencemask |= EMM_INFORMATION_UNIVERSAL_TIME_AND_LOCAL_TIME_ZONE_PRESENT;
      break;

    case EMM_INFORMATION_NETWORK_DAYLIGHT_SAVING_TIME_IEI:
      if ((decoded_result =
             decode_daylight_saving_time(&emm_information->networkdaylightsavingtime,
                                         EMM_INFORMATION_NETWORK_DAYLIGHT_SAVING_TIME_IEI, buffer +
                                         decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      emm_information->presencemask |= EMM_INFORMATION_NETWORK_DAYLIGHT_SAVING_TIME_PRESENT;
      break;

    default:
      errorCodeDecoder = TLV_DECODE_UNEXPECTED_IEI;
      return TLV_DECODE_UNEXPECTED_IEI;
    }
  }

  return decoded;
}

int encode_emm_information(emm_information_msg *emm_information, uint8_t *buffer, uint32_t len)
{
  int encoded = 0;
  int encode_result = 0;

  /* Checking IEI and pointer */
  CHECK_PDU_POINTER_AND_LENGTH_ENCODER(buffer, EMM_INFORMATION_MINIMUM_LENGTH, len);

  if ((emm_information->presencemask & EMM_INFORMATION_FULL_NAME_FOR_NETWORK_PRESENT)
      == EMM_INFORMATION_FULL_NAME_FOR_NETWORK_PRESENT) {
    if ((encode_result =
           encode_network_name(&emm_information->fullnamefornetwork,
                               EMM_INFORMATION_FULL_NAME_FOR_NETWORK_IEI, buffer + encoded, len -
                               encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((emm_information->presencemask & EMM_INFORMATION_SHORT_NAME_FOR_NETWORK_PRESENT)
      == EMM_INFORMATION_SHORT_NAME_FOR_NETWORK_PRESENT) {
    if ((encode_result =
           encode_network_name(&emm_information->shortnamefornetwork,
                               EMM_INFORMATION_SHORT_NAME_FOR_NETWORK_IEI, buffer + encoded, len
                               - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((emm_information->presencemask & EMM_INFORMATION_LOCAL_TIME_ZONE_PRESENT)
      == EMM_INFORMATION_LOCAL_TIME_ZONE_PRESENT) {
    if ((encode_result = encode_time_zone(&emm_information->localtimezone,
                                          EMM_INFORMATION_LOCAL_TIME_ZONE_IEI, buffer + encoded, len -
                                          encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((emm_information->presencemask & EMM_INFORMATION_UNIVERSAL_TIME_AND_LOCAL_TIME_ZONE_PRESENT)
      == EMM_INFORMATION_UNIVERSAL_TIME_AND_LOCAL_TIME_ZONE_PRESENT) {
    if ((encode_result =
           encode_time_zone_and_time(&emm_information->universaltimeandlocaltimezone,
                                     EMM_INFORMATION_UNIVERSAL_TIME_AND_LOCAL_TIME_ZONE_IEI, buffer +
                                     encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((emm_information->presencemask & EMM_INFORMATION_NETWORK_DAYLIGHT_SAVING_TIME_PRESENT)
      == EMM_INFORMATION_NETWORK_DAYLIGHT_SAVING_TIME_PRESENT) {
    if ((encode_result =
           encode_daylight_saving_time(&emm_information->networkdaylightsavingtime,
                                       EMM_INFORMATION_NETWORK_DAYLIGHT_SAVING_TIME_IEI, buffer +
                                       encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  return encoded;
}