1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
/*
* 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 1.0 (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 <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;
LOG_TRACE(INFO," SECURITY MODE COMMAND: IMEISV_REQUEST: %d \n",security_mode_command->imeisvrequest);
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;
}