/******************************************************************************* OpenAirInterface Copyright(c) 1999 - 2014 Eurecom OpenAirInterface is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. OpenAirInterface is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenAirInterface.The full GNU General Public License is included in this distribution in the file called "COPYING". If not, see <http://www.gnu.org/licenses/>. Contact Information OpenAirInterface Admin: openair_admin@eurecom.fr OpenAirInterface Tech : openair_tech@eurecom.fr OpenAirInterface Dev : openair4g-devel@eurecom.fr Address : Eurecom, Compus SophiaTech 450, route des chappes, 06451 Biot, France. *******************************************************************************/ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdint.h> #include "TLVEncoder.h" #include "TLVDecoder.h" #include "NASSecurityModeCommand.h" int decode_security_mode_command(security_mode_command_msg *security_mode_command, 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, SECURITY_MODE_COMMAND_MINIMUM_LENGTH, len); /* Decoding mandatory fields */ if ((decoded_result = decode_nas_security_algorithms(&security_mode_command->selectednassecurityalgorithms, 0, buffer + decoded, len - decoded)) < 0) return decoded_result; else decoded += decoded_result; if ((decoded_result = decode_u8_nas_key_set_identifier(&security_mode_command->naskeysetidentifier, 0, *(buffer + decoded) & 0x0f, len - decoded)) < 0) return decoded_result; decoded++; if ((decoded_result = decode_ue_security_capability(&security_mode_command->replayeduesecuritycapabilities, 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 SECURITY_MODE_COMMAND_IMEISV_REQUEST_IEI: if ((decoded_result = decode_imeisv_request(&security_mode_command->imeisvrequest, SECURITY_MODE_COMMAND_IMEISV_REQUEST_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ security_mode_command->presencemask |= SECURITY_MODE_COMMAND_IMEISV_REQUEST_PRESENT; break; case SECURITY_MODE_COMMAND_REPLAYED_NONCEUE_IEI: if ((decoded_result = decode_nonce(&security_mode_command->replayednonceue, SECURITY_MODE_COMMAND_REPLAYED_NONCEUE_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ security_mode_command->presencemask |= SECURITY_MODE_COMMAND_REPLAYED_NONCEUE_PRESENT; break; case SECURITY_MODE_COMMAND_NONCEMME_IEI: if ((decoded_result = decode_nonce(&security_mode_command->noncemme, SECURITY_MODE_COMMAND_NONCEMME_IEI, buffer + decoded, len - decoded)) <= 0) return decoded_result; decoded += decoded_result; /* Set corresponding mask to 1 in presencemask */ security_mode_command->presencemask |= SECURITY_MODE_COMMAND_NONCEMME_PRESENT; break; default: errorCodeDecoder = TLV_DECODE_UNEXPECTED_IEI; return TLV_DECODE_UNEXPECTED_IEI; } } return decoded; } int encode_security_mode_command(security_mode_command_msg *security_mode_command, uint8_t *buffer, uint32_t len) { int encoded = 0; int encode_result = 0; /* Checking IEI and pointer */ CHECK_PDU_POINTER_AND_LENGTH_ENCODER(buffer, SECURITY_MODE_COMMAND_MINIMUM_LENGTH, len); if ((encode_result = encode_nas_security_algorithms(&security_mode_command->selectednassecurityalgorithms, 0, buffer + encoded, len - encoded)) < 0) //Return in case of error return encode_result; else encoded += encode_result; *(buffer + encoded) = (encode_u8_nas_key_set_identifier(&security_mode_command->naskeysetidentifier) & 0x0f); encoded++; if ((encode_result = encode_ue_security_capability(&security_mode_command->replayeduesecuritycapabilities, 0, buffer + encoded, len - encoded)) < 0) //Return in case of error return encode_result; else encoded += encode_result; if ((security_mode_command->presencemask & SECURITY_MODE_COMMAND_IMEISV_REQUEST_PRESENT) == SECURITY_MODE_COMMAND_IMEISV_REQUEST_PRESENT) { if ((encode_result = encode_imeisv_request(&security_mode_command->imeisvrequest, SECURITY_MODE_COMMAND_IMEISV_REQUEST_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((security_mode_command->presencemask & SECURITY_MODE_COMMAND_REPLAYED_NONCEUE_PRESENT) == SECURITY_MODE_COMMAND_REPLAYED_NONCEUE_PRESENT) { if ((encode_result = encode_nonce(&security_mode_command->replayednonceue, SECURITY_MODE_COMMAND_REPLAYED_NONCEUE_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } if ((security_mode_command->presencemask & SECURITY_MODE_COMMAND_NONCEMME_PRESENT) == SECURITY_MODE_COMMAND_NONCEMME_PRESENT) { if ((encode_result = encode_nonce(&security_mode_command->noncemme, SECURITY_MODE_COMMAND_NONCEMME_IEI, buffer + encoded, len - encoded)) < 0) // Return in case of error return encode_result; else encoded += encode_result; } return encoded; }