openairinterface5g/openair3/NAS/NR_UE/5GS/5GMM/MSG/RegistrationRequest.c

/*
 * SPDX-License-Identifier: LicenseRef-CSSL-1.0
 */

/*!
 * \brief registration request procedures for gNB
 */

#include "RegistrationRequest.h"
#include <stdint.h>
#include "T.h"
#include "nas_log.h"

#define IEI_NULL 0x00

int decode_registration_request(registration_request_msg *registration_request, const uint8_t *buffer, uint32_t len)
{
  uint32_t decoded = 0;
  int decoded_result = 0;

  LOG_FUNC_IN;
  LOG_TRACE(INFO, "5GMM: Registration Request len = %d", len);

  /* Decoding mandatory fields */
  if ((decoded_result =
           decode_5gs_registration_type(&registration_request->fgsregistrationtype, 0, *(buffer + decoded) & 0x0f))
      < 0) {
    LOG_FUNC_RETURN(decoded_result);
  }

  if ((decoded_result = decode_nas_key_set_identifier(&registration_request->naskeysetidentifier, IEI_NULL, *(buffer + decoded) >> 4))
      < 0) {
    //         return decoded_result;
    LOG_FUNC_RETURN(decoded_result);
  }

  decoded++;

  if ((decoded_result = decode_5gs_mobile_identity(&registration_request->fgsmobileidentity, 0, buffer + decoded, len - decoded))
      < 0) {
    LOG_FUNC_RETURN(decoded_result);
  } else
    decoded += decoded_result;

  // TODO, Decoding optional fields

  return decoded;
}

int encode_registration_request(const registration_request_msg *registration_request, uint8_t *buffer, uint32_t len)
{
  int encoded = 0;
  int encode_result = 0;
  bool is_for = true; // Follow-on request pending

  *(buffer + encoded) = ((encode_nas_key_set_identifier(&registration_request->naskeysetidentifier, IEI_NULL) & 0x0f) << 4)
                        | (encode_5gs_registration_type(&registration_request->fgsregistrationtype, is_for) & 0x0f);
  encoded++;

  if ((encode_result = encode_5gs_mobile_identity(&registration_request->fgsmobileidentity, 0, buffer + encoded, len - encoded))
      < 0)
    // Return in case of error
    return encode_result;
  else
    encoded += encode_result;

  if ((registration_request->presencemask & REGISTRATION_REQUEST_5GMM_CAPABILITY_PRESENT)
      == REGISTRATION_REQUEST_5GMM_CAPABILITY_PRESENT) {
    if ((encode_result = encode_5gmm_capability(buffer + encoded, &registration_request->fgmmcapability, len - encoded)) < 0)
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((registration_request->presencemask & REGISTRATION_REQUEST_UE_SECURITY_CAPABILITY_PRESENT)
      == REGISTRATION_REQUEST_UE_SECURITY_CAPABILITY_PRESENT) {
    if ((encode_result = encode_nrue_security_capability(&registration_request->nruesecuritycapability,
                                                         REGISTRATION_REQUEST_UE_SECURITY_CAPABILITY_IEI,
                                                         buffer + encoded))
        < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  // TODO, Encoding optional fields
  return encoded;
}