1 /******************************************************************************
2 *
3 * Copyright 2003-2012 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 /******************************************************************************
20 *
21 * This module contains the link control state machine and functions which
22 * operate on the link control block.
23 *
24 ******************************************************************************/
25
26 #include <base/logging.h>
27 #include <string.h>
28 #include "avct_api.h"
29 #include "avct_int.h"
30 #include "bt_common.h"
31 #include "bt_target.h"
32 #include "bt_types.h"
33 #include "bt_utils.h"
34 #include "osi/include/osi.h"
35
36 /*****************************************************************************
37 * state machine constants and types
38 ****************************************************************************/
39
40 /* verbose state strings for trace */
41 const char* const avct_lcb_st_str[] = {"LCB_IDLE_ST", "LCB_OPENING_ST",
42 "LCB_OPEN_ST", "LCB_CLOSING_ST"};
43
44 /* verbose event strings for trace */
45 const char* const avct_lcb_evt_str[] = {
46 "UL_BIND_EVT", "UL_UNBIND_EVT", "UL_MSG_EVT", "INT_CLOSE_EVT",
47 "LL_OPEN_EVT", "LL_CLOSE_EVT", "LL_MSG_EVT", "LL_CONG_EVT"};
48
49 /* lcb state machine states */
50 enum {
51 AVCT_LCB_IDLE_ST,
52 AVCT_LCB_OPENING_ST,
53 AVCT_LCB_OPEN_ST,
54 AVCT_LCB_CLOSING_ST
55 };
56
57 /* state machine action enumeration list */
58 enum {
59 AVCT_LCB_CHNL_OPEN,
60 AVCT_LCB_CHNL_DISC,
61 AVCT_LCB_SEND_MSG,
62 AVCT_LCB_OPEN_IND,
63 AVCT_LCB_OPEN_FAIL,
64 AVCT_LCB_CLOSE_IND,
65 AVCT_LCB_CLOSE_CFM,
66 AVCT_LCB_MSG_IND,
67 AVCT_LCB_CONG_IND,
68 AVCT_LCB_BIND_CONN,
69 AVCT_LCB_BIND_FAIL,
70 AVCT_LCB_UNBIND_DISC,
71 AVCT_LCB_CHK_DISC,
72 AVCT_LCB_DISCARD_MSG,
73 AVCT_LCB_DEALLOC,
74 AVCT_LCB_FREE_MSG_IND,
75 AVCT_LCB_NUM_ACTIONS
76 };
77
78 #define AVCT_LCB_IGNORE AVCT_LCB_NUM_ACTIONS
79
80 /* type for action functions */
81 typedef void (*tAVCT_LCB_ACTION)(tAVCT_LCB* p_ccb, tAVCT_LCB_EVT* p_data);
82
83 /* action function list */
84 const tAVCT_LCB_ACTION avct_lcb_action[] = {
85 avct_lcb_chnl_open, avct_lcb_chnl_disc, avct_lcb_send_msg,
86 avct_lcb_open_ind, avct_lcb_open_fail, avct_lcb_close_ind,
87 avct_lcb_close_cfm, avct_lcb_msg_ind, avct_lcb_cong_ind,
88 avct_lcb_bind_conn, avct_lcb_bind_fail, avct_lcb_unbind_disc,
89 avct_lcb_chk_disc, avct_lcb_discard_msg, avct_lcb_dealloc,
90 avct_lcb_free_msg_ind};
91
92 /* state table information */
93 #define AVCT_LCB_ACTIONS 2 /* number of actions */
94 #define AVCT_LCB_NEXT_STATE 2 /* position of next state */
95 #define AVCT_LCB_NUM_COLS 3 /* number of columns in state tables */
96
97 /* state table for idle state */
98 const uint8_t avct_lcb_st_idle[][AVCT_LCB_NUM_COLS] = {
99 /* Event Action 1 Action 2 Next state */
100 /* UL_BIND */ {AVCT_LCB_CHNL_OPEN, AVCT_LCB_IGNORE, AVCT_LCB_OPENING_ST},
101 /* UL_UNBIND */ {AVCT_LCB_UNBIND_DISC, AVCT_LCB_IGNORE, AVCT_LCB_IDLE_ST},
102 /* UL_MSG */ {AVCT_LCB_DISCARD_MSG, AVCT_LCB_IGNORE, AVCT_LCB_IDLE_ST},
103 /* INT_CLOSE */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_IDLE_ST},
104 /* LL_OPEN */ {AVCT_LCB_OPEN_IND, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST},
105 /* LL_CLOSE */ {AVCT_LCB_CLOSE_IND, AVCT_LCB_DEALLOC, AVCT_LCB_IDLE_ST},
106 /* LL_MSG */ {AVCT_LCB_FREE_MSG_IND, AVCT_LCB_IGNORE, AVCT_LCB_IDLE_ST},
107 /* LL_CONG */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_IDLE_ST}};
108
109 /* state table for opening state */
110 const uint8_t avct_lcb_st_opening[][AVCT_LCB_NUM_COLS] = {
111 /* Event Action 1 Action 2 Next state */
112 /* UL_BIND */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_OPENING_ST},
113 /* UL_UNBIND */ {AVCT_LCB_UNBIND_DISC, AVCT_LCB_IGNORE,
114 AVCT_LCB_OPENING_ST},
115 /* UL_MSG */ {AVCT_LCB_DISCARD_MSG, AVCT_LCB_IGNORE, AVCT_LCB_OPENING_ST},
116 /* INT_CLOSE */ {AVCT_LCB_CHNL_DISC, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
117 /* LL_OPEN */ {AVCT_LCB_OPEN_IND, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST},
118 /* LL_CLOSE */ {AVCT_LCB_OPEN_FAIL, AVCT_LCB_DEALLOC, AVCT_LCB_IDLE_ST},
119 /* LL_MSG */ {AVCT_LCB_FREE_MSG_IND, AVCT_LCB_IGNORE, AVCT_LCB_OPENING_ST},
120 /* LL_CONG */ {AVCT_LCB_CONG_IND, AVCT_LCB_IGNORE, AVCT_LCB_OPENING_ST}};
121
122 /* state table for open state */
123 const uint8_t avct_lcb_st_open[][AVCT_LCB_NUM_COLS] = {
124 /* Event Action 1 Action 2 Next state */
125 /* UL_BIND */ {AVCT_LCB_BIND_CONN, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST},
126 /* UL_UNBIND */ {AVCT_LCB_CHK_DISC, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST},
127 /* UL_MSG */ {AVCT_LCB_SEND_MSG, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST},
128 /* INT_CLOSE */ {AVCT_LCB_CHNL_DISC, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
129 /* LL_OPEN */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST},
130 /* LL_CLOSE */ {AVCT_LCB_CLOSE_IND, AVCT_LCB_DEALLOC, AVCT_LCB_IDLE_ST},
131 /* LL_MSG */ {AVCT_LCB_MSG_IND, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST},
132 /* LL_CONG */ {AVCT_LCB_CONG_IND, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST}};
133
134 /* state table for closing state */
135 const uint8_t avct_lcb_st_closing[][AVCT_LCB_NUM_COLS] = {
136 /* Event Action 1 Action 2 Next state */
137 /* UL_BIND */ {AVCT_LCB_BIND_FAIL, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
138 /* UL_UNBIND */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
139 /* UL_MSG */ {AVCT_LCB_DISCARD_MSG, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
140 /* INT_CLOSE */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
141 /* LL_OPEN */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
142 /* LL_CLOSE */ {AVCT_LCB_CLOSE_CFM, AVCT_LCB_DEALLOC, AVCT_LCB_IDLE_ST},
143 /* LL_MSG */ {AVCT_LCB_FREE_MSG_IND, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
144 /* LL_CONG */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST}};
145
146 /* type for state table */
147 typedef const uint8_t (*tAVCT_LCB_ST_TBL)[AVCT_LCB_NUM_COLS];
148
149 /* state table */
150 const tAVCT_LCB_ST_TBL avct_lcb_st_tbl[] = {
151 avct_lcb_st_idle, avct_lcb_st_opening, avct_lcb_st_open,
152 avct_lcb_st_closing};
153
154 /*******************************************************************************
155 *
156 * Function avct_lcb_event
157 *
158 * Description State machine event handling function for lcb
159 *
160 *
161 * Returns Nothing.
162 *
163 ******************************************************************************/
avct_lcb_event(tAVCT_LCB * p_lcb,uint8_t event,tAVCT_LCB_EVT * p_data)164 void avct_lcb_event(tAVCT_LCB* p_lcb, uint8_t event, tAVCT_LCB_EVT* p_data) {
165 tAVCT_LCB_ST_TBL state_table;
166 uint8_t action;
167 int i;
168
169 AVCT_TRACE_EVENT("LCB lcb=%d event=%s state=%s", p_lcb->allocated,
170 avct_lcb_evt_str[event], avct_lcb_st_str[p_lcb->state]);
171
172 /* look up the state table for the current state */
173 state_table = avct_lcb_st_tbl[p_lcb->state];
174
175 /* set next state */
176 p_lcb->state = state_table[event][AVCT_LCB_NEXT_STATE];
177
178 /* execute action functions */
179 for (i = 0; i < AVCT_LCB_ACTIONS; i++) {
180 action = state_table[event][i];
181 if (action != AVCT_LCB_IGNORE) {
182 (*avct_lcb_action[action])(p_lcb, p_data);
183 } else {
184 break;
185 }
186 }
187 }
188
189 /*******************************************************************************
190 *
191 * Function avct_bcb_event
192 *
193 * Description State machine event handling function for lcb
194 *
195 *
196 * Returns Nothing.
197 *
198 ******************************************************************************/
avct_bcb_event(tAVCT_BCB * p_bcb,uint8_t event,tAVCT_LCB_EVT * p_data)199 void avct_bcb_event(tAVCT_BCB* p_bcb, uint8_t event, tAVCT_LCB_EVT* p_data) {
200 tAVCT_LCB_ST_TBL state_table;
201 uint8_t action;
202 int i;
203
204 AVCT_TRACE_EVENT("BCB lcb=%d event=%s state=%s", p_bcb->allocated,
205 avct_lcb_evt_str[event], avct_lcb_st_str[p_bcb->state]);
206
207 /* look up the state table for the current state */
208 state_table = avct_lcb_st_tbl[p_bcb->state];
209
210 /* set next state */
211 p_bcb->state = state_table[event][AVCT_LCB_NEXT_STATE];
212
213 /* execute action functions */
214 for (i = 0; i < AVCT_LCB_ACTIONS; i++) {
215 action = state_table[event][i];
216 if (action != AVCT_LCB_IGNORE) {
217 (*avct_bcb_action[action])(p_bcb, p_data);
218 } else {
219 break;
220 }
221 }
222 }
223
224 /*******************************************************************************
225 *
226 * Function avct_lcb_by_bd
227 *
228 * Description This lookup function finds the lcb for a BD address.
229 *
230 *
231 * Returns pointer to the lcb, or NULL if none found.
232 *
233 ******************************************************************************/
avct_lcb_by_bd(const RawAddress & bd_addr)234 tAVCT_LCB* avct_lcb_by_bd(const RawAddress& bd_addr) {
235 tAVCT_LCB* p_lcb = &avct_cb.lcb[0];
236 int i;
237
238 for (i = 0; i < AVCT_NUM_LINKS; i++, p_lcb++) {
239 /* if allocated lcb has matching lcb */
240 if (p_lcb->allocated && p_lcb->peer_addr == bd_addr) {
241 break;
242 }
243 }
244
245 if (i == AVCT_NUM_LINKS) {
246 /* if no lcb found */
247 p_lcb = NULL;
248
249 VLOG(1) << "No lcb for addr " << bd_addr;
250 }
251 return p_lcb;
252 }
253
254 /*******************************************************************************
255 *
256 * Function avct_lcb_alloc
257 *
258 * Description Allocate a link control block.
259 *
260 *
261 * Returns pointer to the lcb, or NULL if none could be allocated.
262 *
263 ******************************************************************************/
avct_lcb_alloc(const RawAddress & bd_addr)264 tAVCT_LCB* avct_lcb_alloc(const RawAddress& bd_addr) {
265 tAVCT_LCB* p_lcb = &avct_cb.lcb[0];
266 int i;
267
268 for (i = 0; i < AVCT_NUM_LINKS; i++, p_lcb++) {
269 if (!p_lcb->allocated) {
270 p_lcb->allocated = (uint8_t)(i + 1);
271 p_lcb->peer_addr = bd_addr;
272 AVCT_TRACE_DEBUG("avct_lcb_alloc %d", p_lcb->allocated);
273 p_lcb->tx_q = fixed_queue_new(SIZE_MAX);
274 break;
275 }
276 }
277
278 if (i == AVCT_NUM_LINKS) {
279 /* out of lcbs */
280 p_lcb = NULL;
281 AVCT_TRACE_WARNING("Out of lcbs");
282 }
283 return p_lcb;
284 }
285
286 /*******************************************************************************
287 *
288 * Function avct_lcb_dealloc
289 *
290 * Description Deallocate a link control block.
291 *
292 *
293 * Returns void.
294 *
295 ******************************************************************************/
avct_lcb_dealloc(tAVCT_LCB * p_lcb,UNUSED_ATTR tAVCT_LCB_EVT * p_data)296 void avct_lcb_dealloc(tAVCT_LCB* p_lcb, UNUSED_ATTR tAVCT_LCB_EVT* p_data) {
297 AVCT_TRACE_DEBUG("%s allocated: %d", __func__, p_lcb->allocated);
298
299 // Check if the LCB is still referenced
300
301 tAVCT_CCB* p_ccb = &avct_cb.ccb[0];
302 for (size_t i = 0; i < AVCT_NUM_CONN; i++, p_ccb++) {
303 if (p_ccb->allocated && p_ccb->p_lcb == p_lcb) {
304 AVCT_TRACE_DEBUG("%s LCB in use; lcb index: %d", __func__, i);
305 return;
306 }
307 }
308
309 // If not, de-allocate now...
310
311 AVCT_TRACE_DEBUG("%s Freeing LCB", __func__);
312 osi_free(p_lcb->p_rx_msg);
313 fixed_queue_free(p_lcb->tx_q, NULL);
314 memset(p_lcb, 0, sizeof(tAVCT_LCB));
315 }
316
317 /*******************************************************************************
318 *
319 * Function avct_lcb_by_lcid
320 *
321 * Description Find the LCB associated with the L2CAP LCID
322 *
323 *
324 * Returns pointer to the lcb, or NULL if none found.
325 *
326 ******************************************************************************/
avct_lcb_by_lcid(uint16_t lcid)327 tAVCT_LCB* avct_lcb_by_lcid(uint16_t lcid) {
328 tAVCT_LCB* p_lcb = &avct_cb.lcb[0];
329 int i;
330
331 for (i = 0; i < AVCT_NUM_LINKS; i++, p_lcb++) {
332 if (p_lcb->allocated &&
333 ((p_lcb->ch_lcid == lcid) || (p_lcb->conflict_lcid == lcid))) {
334 break;
335 }
336 }
337
338 if (i == AVCT_NUM_LINKS) {
339 /* out of lcbs */
340 p_lcb = NULL;
341 AVCT_TRACE_WARNING("No lcb for lcid %x", lcid);
342 }
343
344 return p_lcb;
345 }
346
347 /*******************************************************************************
348 *
349 * Function avct_lcb_has_pid
350 *
351 * Description See if any ccbs on this lcb have a particular pid.
352 *
353 *
354 * Returns Pointer to CCB if PID found, NULL otherwise.
355 *
356 ******************************************************************************/
avct_lcb_has_pid(tAVCT_LCB * p_lcb,uint16_t pid)357 tAVCT_CCB* avct_lcb_has_pid(tAVCT_LCB* p_lcb, uint16_t pid) {
358 tAVCT_CCB* p_ccb = &avct_cb.ccb[0];
359 int i;
360
361 for (i = 0; i < AVCT_NUM_CONN; i++, p_ccb++) {
362 if (p_ccb->allocated && (p_ccb->p_lcb == p_lcb) && (p_ccb->cc.pid == pid)) {
363 return p_ccb;
364 }
365 }
366 return NULL;
367 }
368
369 /*******************************************************************************
370 *
371 * Function avct_lcb_last_ccb
372 *
373 * Description See if given ccb is only one on the lcb.
374 *
375 *
376 * Returns true if ccb is last, false otherwise.
377 *
378 ******************************************************************************/
avct_lcb_last_ccb(tAVCT_LCB * p_lcb,tAVCT_CCB * p_ccb_last)379 bool avct_lcb_last_ccb(tAVCT_LCB* p_lcb, tAVCT_CCB* p_ccb_last) {
380 tAVCT_CCB* p_ccb = &avct_cb.ccb[0];
381 int i;
382
383 AVCT_TRACE_WARNING("avct_lcb_last_ccb");
384 for (i = 0; i < AVCT_NUM_CONN; i++, p_ccb++) {
385 AVCT_TRACE_WARNING("%x: aloc:%d, lcb:0x%x/0x%x, ccb:0x%x/0x%x", i,
386 p_ccb->allocated, p_ccb->p_lcb, p_lcb, p_ccb,
387 p_ccb_last);
388 if (p_ccb->allocated && (p_ccb->p_lcb == p_lcb) && (p_ccb != p_ccb_last)) {
389 return false;
390 }
391 }
392 return true;
393 }
394