pana_header.c

00001 /*
00002  * Copyright (c) 2017, Arm Limited and affiliates.
00003  * SPDX-License-Identifier: Apache-2.0
00004  *
00005  * Licensed under the Apache License, Version 2.0 (the "License");
00006  * you may not use this file except in compliance with the License.
00007  * You may obtain a copy of the License at
00008  *
00009  *     http://www.apache.org/licenses/LICENSE-2.0
00010  *
00011  * Unless required by applicable law or agreed to in writing, software
00012  * distributed under the License is distributed on an "AS IS" BASIS,
00013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  * See the License for the specific language governing permissions and
00015  * limitations under the License.
00016  */
00017 
00018 #include "nsconfig.h"
00019 #include "ns_types.h"
00020 #include "common_functions.h"
00021 #include "Security/PANA/pana_header.h"
00022 
00023 #ifdef PANA
00024 #define PANA_HEADER_START 0x0000
00025 
00026 
00027 
00028 bool pana_header_parse(uint8_t *ptr, uint16_t data_length, pana_header_t *header)
00029 {
00030     if (data_length < 16) {
00031         return false;
00032     }
00033 
00034     if (common_read_16_bit(ptr) != PANA_HEADER_START) {
00035         return false;
00036     }
00037 
00038     header->payload_len = common_read_16_bit(ptr + 2);
00039     ptr += 4;
00040     if (header->payload_len != data_length) {
00041         return false;
00042     }
00043 
00044     header->flags = common_read_16_bit(ptr);
00045     header->type = common_read_16_bit(ptr + 2);
00046     ptr += 4;
00047     header->session_id = common_read_32_bit(ptr);
00048     ptr += 4;
00049     header->seq = common_read_32_bit(ptr);
00050 
00051     return true;
00052 }
00053 
00054 uint8_t *pana_header_write(uint8_t *ptr, const pana_header_t *header)
00055 {
00056     ptr = common_write_16_bit(PANA_HEADER_START, ptr);
00057     ptr = common_write_16_bit(header->payload_len, ptr);
00058     ptr = common_write_16_bit(header->flags, ptr);
00059     ptr = common_write_16_bit(header->type, ptr);
00060     ptr = common_write_32_bit(header->session_id, ptr);
00061     return common_write_32_bit(header->seq, ptr);
00062 }
00063 #endif