1 /******************************************************************************
2 *
3 * Copyright 2014-2015 Broadcom Corporation
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 #include "bt_target.h"
20
21 #include <string.h>
22 #include "log/log.h"
23 #include "smp_int.h"
24
25 const char* const smp_br_state_name[SMP_BR_STATE_MAX + 1] = {
26 "SMP_BR_STATE_IDLE", "SMP_BR_STATE_WAIT_APP_RSP",
27 "SMP_BR_STATE_PAIR_REQ_RSP", "SMP_BR_STATE_BOND_PENDING",
28 "SMP_BR_STATE_OUT_OF_RANGE"};
29
30 const char* const smp_br_event_name[SMP_BR_MAX_EVT] = {
31 "BR_PAIRING_REQ_EVT", "BR_PAIRING_RSP_EVT",
32 "BR_CONFIRM_EVT", "BR_RAND_EVT",
33 "BR_PAIRING_FAILED_EVT", "BR_ENCRPTION_INFO_EVT",
34 "BR_MASTER_ID_EVT", "BR_ID_INFO_EVT",
35 "BR_ID_ADDR_EVT", "BR_SIGN_INFO_EVT",
36 "BR_SECURITY_REQ_EVT", "BR_PAIR_PUBLIC_KEY_EVT",
37 "BR_PAIR_DHKEY_CHCK_EVT", "BR_PAIR_KEYPR_NOTIF_EVT",
38 "BR_KEY_READY_EVT", "BR_ENCRYPTED_EVT",
39 "BR_L2CAP_CONN_EVT", "BR_L2CAP_DISCONN_EVT",
40 "BR_KEYS_RSP_EVT", "BR_API_SEC_GRANT_EVT",
41 "BR_TK_REQ_EVT", "BR_AUTH_CMPL_EVT",
42 "BR_ENC_REQ_EVT", "BR_BOND_REQ_EVT",
43 "BR_DISCARD_SEC_REQ_EVT", "BR_OUT_OF_RANGE_EVT"};
44
45 const char* smp_get_br_event_name(tSMP_BR_EVENT event);
46 const char* smp_get_br_state_name(tSMP_BR_STATE state);
47
48 #define SMP_BR_SM_IGNORE 0
49 #define SMP_BR_NUM_ACTIONS 2
50 #define SMP_BR_SME_NEXT_STATE 2
51 #define SMP_BR_SM_NUM_COLS 3
52 typedef const uint8_t (*tSMP_BR_SM_TBL)[SMP_BR_SM_NUM_COLS];
53
54 enum {
55 SMP_SEND_PAIR_REQ,
56 SMP_BR_SEND_PAIR_RSP,
57 SMP_SEND_PAIR_FAIL,
58 SMP_SEND_ID_INFO,
59 SMP_BR_PROC_PAIR_CMD,
60 SMP_PROC_PAIR_FAIL,
61 SMP_PROC_ID_INFO,
62 SMP_PROC_ID_ADDR,
63 SMP_PROC_SRK_INFO,
64 SMP_BR_PROC_SEC_GRANT,
65 SMP_BR_PROC_SL_KEYS_RSP,
66 SMP_BR_KEY_DISTRIBUTION,
67 SMP_BR_PAIRING_COMPLETE,
68 SMP_SEND_APP_CBACK,
69 SMP_BR_CHECK_AUTH_REQ,
70 SMP_PAIR_TERMINATE,
71 SMP_IDLE_TERMINATE,
72 SMP_BR_SM_NO_ACTION
73 };
74
75 static const tSMP_ACT smp_br_sm_action[] = {
76 smp_send_pair_req, /* SMP_SEND_PAIR_REQ */
77 smp_br_send_pair_response, /* SMP_BR_SEND_PAIR_RSP */
78 smp_send_pair_fail, /* SMP_SEND_PAIR_FAIL */
79 smp_send_id_info, /* SMP_SEND_ID_INFO */
80 smp_br_process_pairing_command, /* SMP_BR_PROC_PAIR_CMD */
81 smp_proc_pair_fail, /* SMP_PROC_PAIR_FAIL */
82 smp_proc_id_info, /* SMP_PROC_ID_INFO */
83 smp_proc_id_addr, /* SMP_PROC_ID_ADDR */
84 smp_proc_srk_info, /* SMP_PROC_SRK_INFO */
85 smp_br_process_security_grant, /* SMP_BR_PROC_SEC_GRANT */
86 smp_br_process_slave_keys_response, /* SMP_BR_PROC_SL_KEYS_RSP */
87 smp_br_select_next_key, /* SMP_BR_KEY_DISTRIBUTION */
88 smp_br_pairing_complete, /* SMP_BR_PAIRING_COMPLETE */
89 smp_send_app_cback, /* SMP_SEND_APP_CBACK */
90 smp_br_check_authorization_request, /* SMP_BR_CHECK_AUTH_REQ */
91 smp_pair_terminate, /* SMP_PAIR_TERMINATE */
92 smp_idle_terminate /* SMP_IDLE_TERMINATE */
93 };
94
95 static const uint8_t smp_br_all_table[][SMP_BR_SM_NUM_COLS] = {
96 /* Event Action Next State */
97 /* BR_PAIRING_FAILED */
98 {SMP_PROC_PAIR_FAIL, SMP_BR_PAIRING_COMPLETE, SMP_BR_STATE_IDLE},
99 /* BR_AUTH_CMPL */
100 {SMP_SEND_PAIR_FAIL, SMP_BR_PAIRING_COMPLETE, SMP_BR_STATE_IDLE},
101 /* BR_L2CAP_DISCONN */
102 {SMP_PAIR_TERMINATE, SMP_BR_SM_NO_ACTION, SMP_BR_STATE_IDLE}};
103
104 /************ SMP Master FSM State/Event Indirection Table **************/
105 static const uint8_t smp_br_master_entry_map[][SMP_BR_STATE_MAX] = {
106 /* br_state name: Idle WaitApp Pair Bond
107 Rsp ReqRsp Pend */
108 /* BR_PAIRING_REQ */ {0, 0, 0, 0},
109 /* BR_PAIRING_RSP */ {0, 0, 1, 0},
110 /* BR_CONFIRM */ {0, 0, 0, 0},
111 /* BR_RAND */ {0, 0, 0, 0},
112 /* BR_PAIRING_FAILED */ {0, 0x81, 0x81, 0},
113 /* BR_ENCRPTION_INFO */ {0, 0, 0, 0},
114 /* BR_MASTER_ID */ {0, 0, 0, 0},
115 /* BR_ID_INFO */ {0, 0, 0, 1},
116 /* BR_ID_ADDR */ {0, 0, 0, 2},
117 /* BR_SIGN_INFO */ {0, 0, 0, 3},
118 /* BR_SECURITY_REQ */ {0, 0, 0, 0},
119 /* BR_PAIR_PUBLIC_KEY_EVT */ {0, 0, 0, 0},
120 /* BR_PAIR_DHKEY_CHCK_EVT */ {0, 0, 0, 0},
121 /* BR_PAIR_KEYPR_NOTIF_EVT */ {0, 0, 0, 0},
122 /* BR_KEY_READY */ {0, 0, 0, 0},
123 /* BR_ENCRYPTED */ {0, 0, 0, 0},
124 /* BR_L2CAP_CONN */ {1, 0, 0, 0},
125 /* BR_L2CAP_DISCONN */ {2, 0x83, 0x83, 0x83},
126 /* BR_KEYS_RSP */ {0, 1, 0, 0},
127 /* BR_API_SEC_GRANT */ {0, 0, 0, 0},
128 /* BR_TK_REQ */ {0, 0, 0, 0},
129 /* BR_AUTH_CMPL */ {0, 0x82, 0x82, 0x82},
130 /* BR_ENC_REQ */ {0, 0, 0, 0},
131 /* BR_BOND_REQ */ {0, 0, 2, 0},
132 /* BR_DISCARD_SEC_REQ */ {0, 0, 0, 0}};
133
134 static const uint8_t smp_br_master_idle_table[][SMP_BR_SM_NUM_COLS] = {
135 /* Event Action Next State */
136 /* BR_L2CAP_CONN */
137 {SMP_SEND_APP_CBACK, SMP_BR_SM_NO_ACTION, SMP_BR_STATE_WAIT_APP_RSP},
138 /* BR_L2CAP_DISCONN */
139 {SMP_IDLE_TERMINATE, SMP_BR_SM_NO_ACTION, SMP_BR_STATE_IDLE}};
140
141 static const uint8_t
142 smp_br_master_wait_appln_response_table[][SMP_BR_SM_NUM_COLS] = {
143 /* Event Action Next State */
144 /* BR_KEYS_RSP */
145 {SMP_SEND_PAIR_REQ, SMP_BR_SM_NO_ACTION, SMP_BR_STATE_PAIR_REQ_RSP}};
146
147 static const uint8_t
148 smp_br_master_pair_request_response_table[][SMP_BR_SM_NUM_COLS] = {
149 /* Event Action Next State */
150 /* BR_PAIRING_RSP */
151 {SMP_BR_PROC_PAIR_CMD, SMP_BR_CHECK_AUTH_REQ,
152 SMP_BR_STATE_PAIR_REQ_RSP},
153 /* BR_BOND_REQ */
154 {SMP_BR_SM_NO_ACTION, SMP_BR_SM_NO_ACTION, SMP_BR_STATE_BOND_PENDING}};
155
156 static const uint8_t smp_br_master_bond_pending_table[][SMP_BR_SM_NUM_COLS] = {
157 /* Event Action Next State */
158 /* BR_ID_INFO */
159 {SMP_PROC_ID_INFO, SMP_BR_SM_NO_ACTION, SMP_BR_STATE_BOND_PENDING},
160 /* BR_ID_ADDR */
161 {SMP_PROC_ID_ADDR, SMP_BR_SM_NO_ACTION, SMP_BR_STATE_BOND_PENDING},
162 /* BR_SIGN_INFO */
163 {SMP_PROC_SRK_INFO, SMP_BR_SM_NO_ACTION, SMP_BR_STATE_BOND_PENDING}};
164
165 static const uint8_t smp_br_slave_entry_map[][SMP_BR_STATE_MAX] = {
166 /* br_state name: Idle WaitApp Pair Bond
167 Rsp ReqRsp Pend */
168 /* BR_PAIRING_REQ */ {1, 0, 0, 0},
169 /* BR_PAIRING_RSP */ {0, 0, 0, 0},
170 /* BR_CONFIRM */ {0, 0, 0, 0},
171 /* BR_RAND */ {0, 0, 0, 0},
172 /* BR_PAIRING_FAILED */ {0, 0x81, 0x81, 0x81},
173 /* BR_ENCRPTION_INFO */ {0, 0, 0, 0},
174 /* BR_MASTER_ID */ {0, 0, 0, 0},
175 /* BR_ID_INFO */ {0, 0, 0, 1},
176 /* BR_ID_ADDR */ {0, 0, 0, 2},
177 /* BR_SIGN_INFO */ {0, 0, 0, 3},
178 /* BR_SECURITY_REQ */ {0, 0, 0, 0},
179 /* BR_PAIR_PUBLIC_KEY_EVT */ {0, 0, 0, 0},
180 /* BR_PAIR_DHKEY_CHCK_EVT */ {0, 0, 0, 0},
181 /* BR_PAIR_KEYPR_NOTIF_EVT */ {0, 0, 0, 0},
182 /* BR_KEY_READY */ {0, 0, 0, 0},
183 /* BR_ENCRYPTED */ {0, 0, 0, 0},
184 /* BR_L2CAP_CONN */ {0, 0, 0, 0},
185 /* BR_L2CAP_DISCONN */ {0, 0x83, 0x83, 0x83},
186 /* BR_KEYS_RSP */ {0, 2, 0, 0},
187 /* BR_API_SEC_GRANT */ {0, 1, 0, 0},
188 /* BR_TK_REQ */ {0, 0, 0, 0},
189 /* BR_AUTH_CMPL */ {0, 0x82, 0x82, 0x82},
190 /* BR_ENC_REQ */ {0, 0, 0, 0},
191 /* BR_BOND_REQ */ {0, 3, 0, 0},
192 /* BR_DISCARD_SEC_REQ */ {0, 0, 0, 0}};
193
194 static const uint8_t smp_br_slave_idle_table[][SMP_BR_SM_NUM_COLS] = {
195 /* Event Action Next State */
196 /* BR_PAIRING_REQ */
197 {SMP_BR_PROC_PAIR_CMD, SMP_SEND_APP_CBACK, SMP_BR_STATE_WAIT_APP_RSP}};
198
199 static const uint8_t
200 smp_br_slave_wait_appln_response_table[][SMP_BR_SM_NUM_COLS] = {
201 /* Event Action Next State */
202 /* BR_API_SEC_GRANT */
203 {SMP_BR_PROC_SEC_GRANT, SMP_SEND_APP_CBACK, SMP_BR_STATE_WAIT_APP_RSP},
204 /* BR_KEYS_RSP */
205 {SMP_BR_PROC_SL_KEYS_RSP, SMP_BR_CHECK_AUTH_REQ,
206 SMP_BR_STATE_WAIT_APP_RSP},
207 /* BR_BOND_REQ */
208 {SMP_BR_KEY_DISTRIBUTION, SMP_BR_SM_NO_ACTION,
209 SMP_BR_STATE_BOND_PENDING}};
210
211 static const uint8_t smp_br_slave_bond_pending_table[][SMP_BR_SM_NUM_COLS] = {
212 /* Event Action Next State */
213 /* BR_ID_INFO */
214 {SMP_PROC_ID_INFO, SMP_BR_SM_NO_ACTION, SMP_BR_STATE_BOND_PENDING},
215 /* BR_ID_ADDR */
216 {SMP_PROC_ID_ADDR, SMP_BR_SM_NO_ACTION, SMP_BR_STATE_BOND_PENDING},
217 /* BR_SIGN_INFO */
218 {SMP_PROC_SRK_INFO, SMP_BR_SM_NO_ACTION, SMP_BR_STATE_BOND_PENDING}};
219
220 static const tSMP_BR_SM_TBL smp_br_state_table[][2] = {
221 /* SMP_BR_STATE_IDLE */
222 {smp_br_master_idle_table, smp_br_slave_idle_table},
223
224 /* SMP_BR_STATE_WAIT_APP_RSP */
225 {smp_br_master_wait_appln_response_table,
226 smp_br_slave_wait_appln_response_table},
227
228 /* SMP_BR_STATE_PAIR_REQ_RSP */
229 {smp_br_master_pair_request_response_table, NULL},
230
231 /* SMP_BR_STATE_BOND_PENDING */
232 {smp_br_master_bond_pending_table, smp_br_slave_bond_pending_table},
233 };
234
235 typedef const uint8_t (*tSMP_BR_ENTRY_TBL)[SMP_BR_STATE_MAX];
236
237 static const tSMP_BR_ENTRY_TBL smp_br_entry_table[] = {smp_br_master_entry_map,
238 smp_br_slave_entry_map};
239
240 #define SMP_BR_ALL_TABLE_MASK 0x80
241
242 /*******************************************************************************
243 * Function smp_set_br_state
244 * Returns None
245 ******************************************************************************/
smp_set_br_state(tSMP_BR_STATE br_state)246 void smp_set_br_state(tSMP_BR_STATE br_state) {
247 if (br_state < SMP_BR_STATE_MAX) {
248 SMP_TRACE_DEBUG("BR_State change: %s(%d) ==> %s(%d)",
249 smp_get_br_state_name(smp_cb.br_state), smp_cb.br_state,
250 smp_get_br_state_name(br_state), br_state);
251 smp_cb.br_state = br_state;
252 } else {
253 SMP_TRACE_DEBUG("%s invalid br_state =%d", __func__, br_state);
254 }
255 }
256
257 /*******************************************************************************
258 * Function smp_get_br_state
259 * Returns The smp_br state
260 ******************************************************************************/
smp_get_br_state(void)261 tSMP_BR_STATE smp_get_br_state(void) { return smp_cb.br_state; }
262
263 /*******************************************************************************
264 * Function smp_get_br_state_name
265 * Returns The smp_br state name.
266 ******************************************************************************/
smp_get_br_state_name(tSMP_BR_STATE br_state)267 const char* smp_get_br_state_name(tSMP_BR_STATE br_state) {
268 const char* p_str = smp_br_state_name[SMP_BR_STATE_MAX];
269
270 if (br_state < SMP_BR_STATE_MAX) p_str = smp_br_state_name[br_state];
271
272 return p_str;
273 }
274 /*******************************************************************************
275 * Function smp_get_br_event_name
276 * Returns The smp_br event name.
277 ******************************************************************************/
smp_get_br_event_name(tSMP_BR_EVENT event)278 const char* smp_get_br_event_name(tSMP_BR_EVENT event) {
279 const char* p_str = smp_br_event_name[SMP_BR_MAX_EVT - 1];
280
281 if (event < SMP_BR_MAX_EVT) {
282 p_str = smp_br_event_name[event - 1];
283 }
284 return p_str;
285 }
286
287 /*******************************************************************************
288 *
289 * Function smp_br_state_machine_event
290 *
291 * Description Handle events to the state machine. It looks up the entry
292 * in the smp_br_entry_table array.
293 * If it is a valid entry, it gets the state table. Set the next
294 * state, if not NULL state. Execute the action function according
295 * to the state table. If the state returned by action function is
296 * not NULL state, adjust the new state to the returned state.
297 *
298 * Returns void.
299 *
300 ******************************************************************************/
smp_br_state_machine_event(tSMP_CB * p_cb,tSMP_BR_EVENT event,tSMP_INT_DATA * p_data)301 void smp_br_state_machine_event(tSMP_CB* p_cb, tSMP_BR_EVENT event,
302 tSMP_INT_DATA* p_data) {
303 tSMP_BR_STATE curr_state = p_cb->br_state;
304 tSMP_BR_SM_TBL state_table;
305 uint8_t action, entry;
306 tSMP_BR_ENTRY_TBL entry_table = smp_br_entry_table[p_cb->role];
307
308 SMP_TRACE_EVENT("main %s", __func__);
309 if (curr_state >= SMP_BR_STATE_MAX) {
310 SMP_TRACE_DEBUG("Invalid br_state: %d", curr_state);
311 return;
312 }
313
314 if (p_cb->role > HCI_ROLE_SLAVE) {
315 SMP_TRACE_ERROR("%s: invalid role %d", __func__, p_cb->role);
316 android_errorWriteLog(0x534e4554, "80145946");
317 return;
318 }
319
320 SMP_TRACE_DEBUG("SMP Role: %s State: [%s (%d)], Event: [%s (%d)]",
321 (p_cb->role == HCI_ROLE_SLAVE) ? "Slave" : "Master",
322 smp_get_br_state_name(p_cb->br_state), p_cb->br_state,
323 smp_get_br_event_name(event), event);
324
325 /* look up the state table for the current state */
326 /* lookup entry / w event & curr_state */
327 /* If entry is ignore, return.
328 * Otherwise, get state table (according to curr_state or all_state) */
329 if ((event <= SMP_BR_MAX_EVT) &&
330 ((entry = entry_table[event - 1][curr_state]) != SMP_BR_SM_IGNORE)) {
331 if (entry & SMP_BR_ALL_TABLE_MASK) {
332 entry &= ~SMP_BR_ALL_TABLE_MASK;
333 state_table = smp_br_all_table;
334 } else {
335 state_table = smp_br_state_table[curr_state][p_cb->role];
336 }
337 } else {
338 SMP_TRACE_DEBUG("Ignore event [%s (%d)] in state [%s (%d)]",
339 smp_get_br_event_name(event), event,
340 smp_get_br_state_name(curr_state), curr_state);
341 return;
342 }
343
344 /* Get possible next state from state table. */
345
346 smp_set_br_state(state_table[entry - 1][SMP_BR_SME_NEXT_STATE]);
347
348 /* If action is not ignore, clear param, exec action and get next state.
349 * The action function may set the Param for cback.
350 * Depending on param, call cback or free buffer. */
351 /* execute action functions */
352 for (uint8_t i = 0; i < SMP_BR_NUM_ACTIONS; i++) {
353 action = state_table[entry - 1][i];
354 if (action != SMP_BR_SM_NO_ACTION) {
355 (*smp_br_sm_action[action])(p_cb, p_data);
356 } else {
357 break;
358 }
359 }
360 SMP_TRACE_DEBUG("result state = %s", smp_get_br_state_name(p_cb->br_state));
361 }
362