/* * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The OpenAirInterface Software Alliance licenses this file to You under * the OAI Public License, Version 1.1 (the "License"); you may not use this file * except in compliance with the License. * You may obtain a copy of the License at * * http://www.openairinterface.org/?page_id=698 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *------------------------------------------------------------------------------- * For more information about the OpenAirInterface (OAI) Software Alliance: * contact@openairinterface.org */ #include #include #include #include #include "TLVEncoder.h" #include "TLVDecoder.h" #include "TrackingAreaUpdateRequest.h" int decode_tracking_area_update_request(tracking_area_update_request_msg *tracking_area_update_request, 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, TRACKING_AREA_UPDATE_REQUEST_MINIMUM_LENGTH, len); /* Decoding mandatory fields */ if ((decoded_result = decode_u8_eps_update_type(&tracking_area_update_request->epsupdatetype, 0, *(buffer + decoded) >> 4, len - decoded)) < 0) return decoded_result; if ((decoded_result = decode_nas_key_set_identifier(&tracking_area_update_request->naskeysetidentifier, 0, *(buffer + decoded) & 0x0f)) < 0) return decoded_result; decoded++; if ((decoded_result = decode_eps_mobile_identity(&tracking_area_update_request->oldguti, 0, buffer + decoded, len - decoded)) < 0) return decoded_result; else decoded += decoded_result; /* 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 TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_IEI: if ((decoded_result = decode_nas_key_set_identifier(&tracking_area_update_request->noncurrentnativenaskeysetidentifier, TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_IEI, *(buffer + decoded))) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_IEI: if ((decoded_result = decode_ciphering_key_sequence_number(&tracking_area_update_request->gprscipheringkeysequencenumber, TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_IEI: if ((decoded_result = decode_p_tmsi_signature(&tracking_area_update_request->oldptmsisignature, TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_IEI: if ((decoded_result = decode_eps_mobile_identity(&tracking_area_update_request->additionalguti, TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_NONCEUE_IEI: if ((decoded_result = decode_nonce(&tracking_area_update_request->nonceue, TRACKING_AREA_UPDATE_REQUEST_NONCEUE_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_NONCEUE_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_IEI: if ((decoded_result = decode_ue_network_capability(&tracking_area_update_request->uenetworkcapability, TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_IEI: if ((decoded_result = decode_tracking_area_identity(&tracking_area_update_request->lastvisitedregisteredtai, TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_IEI: if ((decoded_result = decode_drx_parameter(&tracking_area_update_request->drxparameter, TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_IEI: if ((decoded_result = decode_ue_radio_capability_information_update_needed(&tracking_area_update_request->ueradiocapabilityinformationupdateneeded, TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_IEI: if ((decoded_result = decode_eps_bearer_context_status(&tracking_area_update_request->epsbearercontextstatus, TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_IEI: if ((decoded_result = decode_ms_network_capability(&tracking_area_update_request->msnetworkcapability, TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_IEI: if ((decoded_result = decode_location_area_identification(&tracking_area_update_request->oldlocationareaidentification, TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_IEI: if ((decoded_result = decode_tmsi_status(&tracking_area_update_request->tmsistatus, TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_IEI: if ((decoded_result = decode_mobile_station_classmark_2(&tracking_area_update_request->mobilestationclassmark2, TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_IEI: if ((decoded_result = decode_mobile_station_classmark_3(&tracking_area_update_request->mobilestationclassmark3, TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_IEI: if ((decoded_result = decode_supported_codec_list(&tracking_area_update_request->supportedcodecs, TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_IEI: if ((decoded_result = decode_additional_update_type(&tracking_area_update_request->additionalupdatetype, TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_PRESENT; break; case TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_IEI: if ((decoded_result = decode_guti_type(&tracking_area_update_request->oldgutitype, TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_PRESENT; break; default: errorCodeDecoder = TLV_DECODE_UNEXPECTED_IEI; return TLV_DECODE_UNEXPECTED_IEI; } } return decoded; } int encode_tracking_area_update_request(tracking_area_update_request_msg *tracking_area_update_request, uint8_t *buffer, uint32_t len) { int encoded = 0; int encode_result = 0; /* Checking IEI and pointer */ CHECK_PDU_POINTER_AND_LENGTH_ENCODER(buffer, TRACKING_AREA_UPDATE_REQUEST_MINIMUM_LENGTH, len); *(buffer + encoded) = ((encode_u8_eps_update_type(&tracking_area_update_request->epsupdatetype) & 0x0f) << 4) | (encode_nas_key_set_identifier(&tracking_area_update_request->naskeysetidentifier, 0) & 0x0f); encoded++; if ((encode_result = encode_eps_mobile_identity(&tracking_area_update_request->oldguti, 0, buffer + encoded, len - encoded)) < 0) //Return in case of error return encode_result; else encoded += encode_result; if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_PRESENT) { if ((encode_result = encode_nas_key_set_identifier(&tracking_area_update_request->noncurrentnativenaskeysetidentifier, TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_IEI)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_PRESENT) { if ((encode_result = encode_ciphering_key_sequence_number(&tracking_area_update_request->gprscipheringkeysequencenumber, TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_PRESENT) { if ((encode_result = encode_p_tmsi_signature(&tracking_area_update_request->oldptmsisignature, TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_PRESENT) { if ((encode_result = encode_eps_mobile_identity(&tracking_area_update_request->additionalguti, TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_NONCEUE_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_NONCEUE_PRESENT) { if ((encode_result = encode_nonce(&tracking_area_update_request->nonceue, TRACKING_AREA_UPDATE_REQUEST_NONCEUE_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_PRESENT) { if ((encode_result = encode_ue_network_capability(&tracking_area_update_request->uenetworkcapability, TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_PRESENT) { if ((encode_result = encode_tracking_area_identity(&tracking_area_update_request->lastvisitedregisteredtai, TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_PRESENT) { if ((encode_result = encode_drx_parameter(&tracking_area_update_request->drxparameter, TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_PRESENT) { if ((encode_result = encode_ue_radio_capability_information_update_needed(&tracking_area_update_request->ueradiocapabilityinformationupdateneeded, TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_PRESENT) { if ((encode_result = encode_eps_bearer_context_status(&tracking_area_update_request->epsbearercontextstatus, TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_PRESENT) { if ((encode_result = encode_ms_network_capability(&tracking_area_update_request->msnetworkcapability, TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_PRESENT) { if ((encode_result = encode_location_area_identification(&tracking_area_update_request->oldlocationareaidentification, TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_PRESENT) { if ((encode_result = encode_tmsi_status(&tracking_area_update_request->tmsistatus, TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_PRESENT) { if ((encode_result = encode_mobile_station_classmark_2(&tracking_area_update_request->mobilestationclassmark2, TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_PRESENT) { if ((encode_result = encode_mobile_station_classmark_3(&tracking_area_update_request->mobilestationclassmark3, TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_PRESENT) { if ((encode_result = encode_supported_codec_list(&tracking_area_update_request->supportedcodecs, TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_PRESENT) { if ((encode_result = encode_additional_update_type(&tracking_area_update_request->additionalupdatetype, TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_PRESENT) == TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_PRESENT) { if ((encode_result = encode_guti_type(&tracking_area_update_request->oldgutitype, TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } return encoded; }