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
175
176
177
178
179
/*******************************************************************************
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;
}