1 /******************************************************************************
2 *
3 * Copyright 2014 Google, Inc.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 ******************************************************************************/
18
19 #define LOG_TAG "bt_hci"
20
21 #include "hci_packet_parser.h"
22
23 #include <base/logging.h>
24
25 #include "buffer_allocator.h"
26 #include "hci_layer.h"
27 #include "hcimsgs.h"
28 #include "osi/include/log.h"
29
30 static const command_opcode_t NO_OPCODE_CHECKING = 0;
31
32 static const allocator_t* buffer_allocator;
33
34 static uint8_t* read_command_complete_header(BT_HDR* response,
35 command_opcode_t expected_opcode,
36 size_t minimum_bytes_after);
37
parse_generic_command_complete(BT_HDR * response)38 static void parse_generic_command_complete(BT_HDR* response) {
39 read_command_complete_header(response, NO_OPCODE_CHECKING,
40 0 /* bytes after */);
41
42 buffer_allocator->free(response);
43 }
44
parse_read_buffer_size_response(BT_HDR * response,uint16_t * data_size_ptr,uint16_t * acl_buffer_count_ptr)45 static void parse_read_buffer_size_response(BT_HDR* response,
46 uint16_t* data_size_ptr,
47 uint16_t* acl_buffer_count_ptr) {
48 uint8_t* stream = read_command_complete_header(response, HCI_READ_BUFFER_SIZE,
49 5 /* bytes after */);
50 CHECK(stream != NULL);
51 STREAM_TO_UINT16(*data_size_ptr, stream);
52 STREAM_SKIP_UINT8(stream); // skip the sco packet length
53 STREAM_TO_UINT16(*acl_buffer_count_ptr, stream);
54
55 buffer_allocator->free(response);
56 }
57
parse_read_local_version_info_response(BT_HDR * response,bt_version_t * bt_version)58 static void parse_read_local_version_info_response(BT_HDR* response,
59 bt_version_t* bt_version) {
60 uint8_t* stream = read_command_complete_header(
61 response, HCI_READ_LOCAL_VERSION_INFO, 8 /* bytes after */);
62 CHECK(stream != NULL);
63 STREAM_TO_UINT8(bt_version->hci_version, stream);
64 STREAM_TO_UINT16(bt_version->hci_revision, stream);
65 STREAM_TO_UINT8(bt_version->lmp_version, stream);
66 STREAM_TO_UINT16(bt_version->manufacturer, stream);
67 STREAM_TO_UINT16(bt_version->lmp_subversion, stream);
68
69 buffer_allocator->free(response);
70 }
71
parse_read_local_supported_codecs_response(BT_HDR * response,uint8_t * number_of_local_supported_codecs,uint8_t * local_supported_codecs)72 static void parse_read_local_supported_codecs_response(
73 BT_HDR* response, uint8_t* number_of_local_supported_codecs,
74 uint8_t* local_supported_codecs) {
75 uint8_t* stream = read_command_complete_header(
76 response, HCI_READ_LOCAL_SUPPORTED_CODECS, 0 /* bytes after */);
77 if (stream) {
78 STREAM_TO_UINT8(*number_of_local_supported_codecs, stream);
79 for (uint8_t i = 0; i < *number_of_local_supported_codecs; i++) {
80 STREAM_TO_UINT8(*local_supported_codecs, stream);
81 local_supported_codecs++;
82 }
83 }
84
85 buffer_allocator->free(response);
86 }
87
parse_read_bd_addr_response(BT_HDR * response,RawAddress * address_ptr)88 static void parse_read_bd_addr_response(BT_HDR* response,
89 RawAddress* address_ptr) {
90 uint8_t* stream = read_command_complete_header(
91 response, HCI_READ_BD_ADDR, RawAddress::kLength /* bytes after */);
92 CHECK(stream != NULL);
93 STREAM_TO_BDADDR(*address_ptr, stream);
94
95 buffer_allocator->free(response);
96 }
97
parse_read_local_supported_commands_response(BT_HDR * response,uint8_t * supported_commands_ptr,size_t supported_commands_length)98 static void parse_read_local_supported_commands_response(
99 BT_HDR* response, uint8_t* supported_commands_ptr,
100 size_t supported_commands_length) {
101 uint8_t* stream =
102 read_command_complete_header(response, HCI_READ_LOCAL_SUPPORTED_CMDS,
103 supported_commands_length /* bytes after */);
104 CHECK(stream != NULL);
105 STREAM_TO_ARRAY(supported_commands_ptr, stream,
106 (int)supported_commands_length);
107
108 buffer_allocator->free(response);
109 }
110
parse_read_local_extended_features_response(BT_HDR * response,uint8_t * page_number_ptr,uint8_t * max_page_number_ptr,bt_device_features_t * feature_pages,size_t feature_pages_count)111 static void parse_read_local_extended_features_response(
112 BT_HDR* response, uint8_t* page_number_ptr, uint8_t* max_page_number_ptr,
113 bt_device_features_t* feature_pages, size_t feature_pages_count) {
114 uint8_t* stream = read_command_complete_header(
115 response, HCI_READ_LOCAL_EXT_FEATURES,
116 2 + sizeof(bt_device_features_t) /* bytes after */);
117 CHECK(stream != NULL);
118
119 STREAM_TO_UINT8(*page_number_ptr, stream);
120 STREAM_TO_UINT8(*max_page_number_ptr, stream);
121
122 CHECK(*page_number_ptr < feature_pages_count);
123 STREAM_TO_ARRAY(feature_pages[*page_number_ptr].as_array, stream,
124 (int)sizeof(bt_device_features_t));
125
126 buffer_allocator->free(response);
127 }
128
parse_ble_read_white_list_size_response(BT_HDR * response,uint8_t * white_list_size_ptr)129 static void parse_ble_read_white_list_size_response(
130 BT_HDR* response, uint8_t* white_list_size_ptr) {
131 uint8_t* stream = read_command_complete_header(
132 response, HCI_BLE_READ_WHITE_LIST_SIZE, 1 /* byte after */);
133 CHECK(stream != NULL);
134 STREAM_TO_UINT8(*white_list_size_ptr, stream);
135
136 buffer_allocator->free(response);
137 }
138
parse_ble_read_buffer_size_response(BT_HDR * response,uint16_t * data_size_ptr,uint8_t * acl_buffer_count_ptr)139 static void parse_ble_read_buffer_size_response(BT_HDR* response,
140 uint16_t* data_size_ptr,
141 uint8_t* acl_buffer_count_ptr) {
142 uint8_t* stream = read_command_complete_header(
143 response, HCI_BLE_READ_BUFFER_SIZE, 3 /* bytes after */);
144 CHECK(stream != NULL);
145 STREAM_TO_UINT16(*data_size_ptr, stream);
146 STREAM_TO_UINT8(*acl_buffer_count_ptr, stream);
147
148 buffer_allocator->free(response);
149 }
150
parse_ble_read_supported_states_response(BT_HDR * response,uint8_t * supported_states,size_t supported_states_size)151 static void parse_ble_read_supported_states_response(
152 BT_HDR* response, uint8_t* supported_states, size_t supported_states_size) {
153 uint8_t* stream =
154 read_command_complete_header(response, HCI_BLE_READ_SUPPORTED_STATES,
155 supported_states_size /* bytes after */);
156 CHECK(stream != NULL);
157 STREAM_TO_ARRAY(supported_states, stream, (int)supported_states_size);
158
159 buffer_allocator->free(response);
160 }
161
parse_ble_read_local_supported_features_response(BT_HDR * response,bt_device_features_t * supported_features)162 static void parse_ble_read_local_supported_features_response(
163 BT_HDR* response, bt_device_features_t* supported_features) {
164 uint8_t* stream = read_command_complete_header(
165 response, HCI_BLE_READ_LOCAL_SPT_FEAT,
166 sizeof(bt_device_features_t) /* bytes after */);
167 CHECK(stream != NULL);
168 STREAM_TO_ARRAY(supported_features->as_array, stream,
169 (int)sizeof(bt_device_features_t));
170
171 buffer_allocator->free(response);
172 }
173
parse_ble_read_resolving_list_size_response(BT_HDR * response,uint8_t * resolving_list_size_ptr)174 static void parse_ble_read_resolving_list_size_response(
175 BT_HDR* response, uint8_t* resolving_list_size_ptr) {
176 uint8_t* stream = read_command_complete_header(
177 response, HCI_BLE_READ_RESOLVING_LIST_SIZE, 1 /* bytes after */);
178 STREAM_TO_UINT8(*resolving_list_size_ptr, stream);
179
180 buffer_allocator->free(response);
181 }
182
parse_ble_read_suggested_default_data_length_response(BT_HDR * response,uint16_t * ble_default_packet_length_ptr)183 static void parse_ble_read_suggested_default_data_length_response(
184 BT_HDR* response, uint16_t* ble_default_packet_length_ptr) {
185 uint8_t* stream = read_command_complete_header(
186 response, HCI_BLE_READ_DEFAULT_DATA_LENGTH, 2 /* bytes after */);
187 STREAM_TO_UINT16(*ble_default_packet_length_ptr, stream);
188
189 buffer_allocator->free(response);
190 }
191
parse_ble_read_maximum_data_length_response(BT_HDR * response,uint16_t * ble_supported_max_tx_octets,uint16_t * ble_supported_max_tx_time,uint16_t * ble_supported_max_rx_octets,uint16_t * ble_supported_max_rx_time)192 static void parse_ble_read_maximum_data_length_response(
193 BT_HDR* response, uint16_t* ble_supported_max_tx_octets,
194 uint16_t* ble_supported_max_tx_time, uint16_t* ble_supported_max_rx_octets,
195 uint16_t* ble_supported_max_rx_time) {
196 uint8_t* stream = read_command_complete_header(
197 response, HCI_BLE_READ_MAXIMUM_DATA_LENGTH, 8 /* bytes after */);
198 STREAM_TO_UINT16(*ble_supported_max_tx_octets, stream);
199 STREAM_TO_UINT16(*ble_supported_max_tx_time, stream);
200 STREAM_TO_UINT16(*ble_supported_max_rx_octets, stream);
201 STREAM_TO_UINT16(*ble_supported_max_rx_time, stream);
202
203 buffer_allocator->free(response);
204 }
205
parse_ble_read_maximum_advertising_data_length(BT_HDR * response,uint16_t * ble_maximum_advertising_data_length_ptr)206 static void parse_ble_read_maximum_advertising_data_length(
207 BT_HDR* response, uint16_t* ble_maximum_advertising_data_length_ptr) {
208 uint8_t* stream = read_command_complete_header(
209 response, HCI_LE_READ_MAXIMUM_ADVERTISING_DATA_LENGTH,
210 2 /* bytes after */);
211 STREAM_TO_UINT16(*ble_maximum_advertising_data_length_ptr, stream);
212
213 buffer_allocator->free(response);
214 }
215
parse_ble_read_number_of_supported_advertising_sets(BT_HDR * response,uint8_t * ble_number_of_supported_advertising_sets_ptr)216 static void parse_ble_read_number_of_supported_advertising_sets(
217 BT_HDR* response, uint8_t* ble_number_of_supported_advertising_sets_ptr) {
218 uint8_t* stream = read_command_complete_header(
219 response, HCI_LE_READ_NUMBER_OF_SUPPORTED_ADVERTISING_SETS,
220 1 /* bytes after */);
221 STREAM_TO_UINT8(*ble_number_of_supported_advertising_sets_ptr, stream);
222
223 buffer_allocator->free(response);
224 }
225
226 // Internal functions
227
read_command_complete_header(BT_HDR * response,command_opcode_t expected_opcode,size_t minimum_bytes_after)228 static uint8_t* read_command_complete_header(BT_HDR* response,
229 command_opcode_t expected_opcode,
230 size_t minimum_bytes_after) {
231 uint8_t* stream = response->data + response->offset;
232
233 // Read the event header
234 uint8_t event_code;
235 uint8_t parameter_length;
236 STREAM_TO_UINT8(event_code, stream);
237 STREAM_TO_UINT8(parameter_length, stream);
238
239 const size_t parameter_bytes_we_read_here = 4;
240
241 // Check the event header values against what we expect
242 CHECK(event_code == HCI_COMMAND_COMPLETE_EVT);
243 CHECK(parameter_length >=
244 (parameter_bytes_we_read_here + minimum_bytes_after));
245
246 // Read the command complete header
247 command_opcode_t opcode;
248 uint8_t status;
249 STREAM_SKIP_UINT8(stream); // skip the number of hci command packets field
250 STREAM_TO_UINT16(opcode, stream);
251
252 // Check the command complete header values against what we expect
253 if (expected_opcode != NO_OPCODE_CHECKING) {
254 CHECK(opcode == expected_opcode);
255 }
256
257 // Assume the next field is the status field
258 STREAM_TO_UINT8(status, stream);
259
260 if (status != HCI_SUCCESS) {
261 LOG_ERROR(LOG_TAG, "%s: return status - 0x%x", __func__, status);
262 return NULL;
263 }
264
265 return stream;
266 }
267
268 static const hci_packet_parser_t interface = {
269 parse_generic_command_complete,
270 parse_read_buffer_size_response,
271 parse_read_local_version_info_response,
272 parse_read_bd_addr_response,
273 parse_read_local_supported_commands_response,
274 parse_read_local_extended_features_response,
275 parse_ble_read_white_list_size_response,
276 parse_ble_read_buffer_size_response,
277 parse_ble_read_supported_states_response,
278 parse_ble_read_local_supported_features_response,
279 parse_ble_read_resolving_list_size_response,
280 parse_ble_read_suggested_default_data_length_response,
281 parse_ble_read_maximum_data_length_response,
282 parse_ble_read_maximum_advertising_data_length,
283 parse_ble_read_number_of_supported_advertising_sets,
284 parse_read_local_supported_codecs_response};
285
hci_packet_parser_get_interface()286 const hci_packet_parser_t* hci_packet_parser_get_interface() {
287 buffer_allocator = buffer_allocator_get_interface();
288 return &interface;
289 }
290
hci_packet_parser_get_test_interface(allocator_t * buffer_allocator_interface)291 const hci_packet_parser_t* hci_packet_parser_get_test_interface(
292 allocator_t* buffer_allocator_interface) {
293 buffer_allocator = buffer_allocator_interface;
294 return &interface;
295 }
296