1 /******************************************************************************
2 *
3 * Copyright (C) 1999-2012 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 file contains collection of utility functions used the RFCOMM unit
22 *
23 *****************************************************************************/
24
25 #include "bt_target.h"
26 #include "gki.h"
27
28 #include "btm_api.h"
29 #include "btm_int.h"
30 #include "rfcdefs.h"
31 #include "port_api.h"
32 #include "port_ext.h"
33 #include "port_int.h"
34 #include "rfc_int.h"
35 #include "btu.h"
36 #include "bt_utils.h"
37
38 #include <string.h>
39
40 /*******************************************************************************
41 **
42 ** Function rfc_calc_fcs
43 **
44 ** Description Reversed CRC Table , 8-bit, poly=0x07
45 ** (GSM 07.10 TS 101 369 V6.3.0)
46 *******************************************************************************/
47 static const UINT8 rfc_crctable[] =
48 {
49 0x00, 0x91, 0xE3, 0x72, 0x07, 0x96, 0xE4, 0x75, 0x0E, 0x9F, 0xED, 0x7C, 0x09, 0x98, 0xEA, 0x7B,
50 0x1C, 0x8D, 0xFF, 0x6E, 0x1B, 0x8A, 0xF8, 0x69, 0x12, 0x83, 0xF1, 0x60, 0x15, 0x84, 0xF6, 0x67,
51 0x38, 0xA9, 0xDB, 0x4A, 0x3F, 0xAE, 0xDC, 0x4D, 0x36, 0xA7, 0xD5, 0x44, 0x31, 0xA0, 0xD2, 0x43,
52 0x24, 0xB5, 0xC7, 0x56, 0x23, 0xB2, 0xC0, 0x51, 0x2A, 0xBB, 0xC9, 0x58, 0x2D, 0xBC, 0xCE, 0x5F,
53
54 0x70, 0xE1, 0x93, 0x02, 0x77, 0xE6, 0x94, 0x05, 0x7E, 0xEF, 0x9D, 0x0C, 0x79, 0xE8, 0x9A, 0x0B,
55 0x6C, 0xFD, 0x8F, 0x1E, 0x6B, 0xFA, 0x88, 0x19, 0x62, 0xF3, 0x81, 0x10, 0x65, 0xF4, 0x86, 0x17,
56 0x48, 0xD9, 0xAB, 0x3A, 0x4F, 0xDE, 0xAC, 0x3D, 0x46, 0xD7, 0xA5, 0x34, 0x41, 0xD0, 0xA2, 0x33,
57 0x54, 0xC5, 0xB7, 0x26, 0x53, 0xC2, 0xB0, 0x21, 0x5A, 0xCB, 0xB9, 0x28, 0x5D, 0xCC, 0xBE, 0x2F,
58
59 0xE0, 0x71, 0x03, 0x92, 0xE7, 0x76, 0x04, 0x95, 0xEE, 0x7F, 0x0D, 0x9C, 0xE9, 0x78, 0x0A, 0x9B,
60 0xFC, 0x6D, 0x1F, 0x8E, 0xFB, 0x6A, 0x18, 0x89, 0xF2, 0x63, 0x11, 0x80, 0xF5, 0x64, 0x16, 0x87,
61 0xD8, 0x49, 0x3B, 0xAA, 0xDF, 0x4E, 0x3C, 0xAD, 0xD6, 0x47, 0x35, 0xA4, 0xD1, 0x40, 0x32, 0xA3,
62 0xC4, 0x55, 0x27, 0xB6, 0xC3, 0x52, 0x20, 0xB1, 0xCA, 0x5B, 0x29, 0xB8, 0xCD, 0x5C, 0x2E, 0xBF,
63
64 0x90, 0x01, 0x73, 0xE2, 0x97, 0x06, 0x74, 0xE5, 0x9E, 0x0F, 0x7D, 0xEC, 0x99, 0x08, 0x7A, 0xEB,
65 0x8C, 0x1D, 0x6F, 0xFE, 0x8B, 0x1A, 0x68, 0xF9, 0x82, 0x13, 0x61, 0xF0, 0x85, 0x14, 0x66, 0xF7,
66 0xA8, 0x39, 0x4B, 0xDA, 0xAF, 0x3E, 0x4C, 0xDD, 0xA6, 0x37, 0x45, 0xD4, 0xA1, 0x30, 0x42, 0xD3,
67 0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1, 0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF
68 };
69
70
71 /*******************************************************************************
72 **
73 ** Function rfc_calc_fcs
74 **
75 ** Description This function calculate FCS for the RFCOMM frame
76 ** (GSM 07.10 TS 101 369 V6.3.0)
77 **
78 ** Input len - number of bytes in the message
79 ** p - points to message
80 **
81 *******************************************************************************/
rfc_calc_fcs(UINT16 len,UINT8 * p)82 UINT8 rfc_calc_fcs (UINT16 len, UINT8 *p)
83 {
84 UINT8 fcs = 0xFF;
85
86 while (len--)
87 {
88 fcs = rfc_crctable[fcs ^ *p++];
89 }
90
91 /* Ones compliment */
92 return (0xFF - fcs);
93 }
94
95
96 /*******************************************************************************
97 **
98 ** Function rfc_check_fcs
99 **
100 ** Description This function checks FCS for the RFCOMM frame
101 ** (GSM 07.10 TS 101 369 V6.3.0)
102 **
103 ** Input len - number of bytes in the message
104 ** p - points to message
105 ** received_fcs - received FCS
106 **
107 *******************************************************************************/
rfc_check_fcs(UINT16 len,UINT8 * p,UINT8 received_fcs)108 BOOLEAN rfc_check_fcs (UINT16 len, UINT8 *p, UINT8 received_fcs)
109 {
110 UINT8 fcs = 0xFF;
111
112 while (len--)
113 {
114 fcs = rfc_crctable[fcs ^ *p++];
115 }
116
117 /* Ones compliment */
118 fcs = rfc_crctable[fcs ^ received_fcs];
119
120 /*0xCF is the reversed order of 11110011.*/
121 return (fcs == 0xCF);
122 }
123
124
125 /*******************************************************************************
126 **
127 ** Function rfc_alloc_multiplexer_channel
128 **
129 ** Description This function returns existing or new control block for
130 ** the BD_ADDR.
131 **
132 *******************************************************************************/
rfc_alloc_multiplexer_channel(BD_ADDR bd_addr,BOOLEAN is_initiator)133 tRFC_MCB *rfc_alloc_multiplexer_channel (BD_ADDR bd_addr, BOOLEAN is_initiator)
134 {
135 int i, j;
136 tRFC_MCB *p_mcb = NULL;
137 RFCOMM_TRACE_DEBUG("rfc_alloc_multiplexer_channel: bd_addr:%02x:%02x:%02x:%02x:%02x:%02x",
138 bd_addr[0], bd_addr[1], bd_addr[2], bd_addr[3], bd_addr[4], bd_addr[5]);
139 RFCOMM_TRACE_DEBUG("rfc_alloc_multiplexer_channel:is_initiator:%d", is_initiator);
140
141 for (i = 0; i < MAX_BD_CONNECTIONS; i++)
142 {
143 RFCOMM_TRACE_DEBUG("rfc_alloc_multiplexer_channel rfc_cb.port.rfc_mcb[%d].state:%d",
144 i, rfc_cb.port.rfc_mcb[i].state);
145 RFCOMM_TRACE_DEBUG("(rfc_cb.port.rfc_mcb[i].bd_addr:%02x:%02x:%02x:%02x:%02x:%02x",
146 rfc_cb.port.rfc_mcb[i].bd_addr[0], rfc_cb.port.rfc_mcb[i].bd_addr[1],
147 rfc_cb.port.rfc_mcb[i].bd_addr[2], rfc_cb.port.rfc_mcb[i].bd_addr[3],
148 rfc_cb.port.rfc_mcb[i].bd_addr[4], rfc_cb.port.rfc_mcb[i].bd_addr[5]);
149
150 if ((rfc_cb.port.rfc_mcb[i].state != RFC_MX_STATE_IDLE)
151 && (!memcmp (rfc_cb.port.rfc_mcb[i].bd_addr, bd_addr, BD_ADDR_LEN)))
152 {
153 /* Multiplexer channel found do not change anything */
154 /* If there was an inactivity timer running stop it now */
155 if (rfc_cb.port.rfc_mcb[i].state == RFC_MX_STATE_CONNECTED)
156 rfc_timer_stop (&rfc_cb.port.rfc_mcb[i]);
157 RFCOMM_TRACE_DEBUG("rfc_alloc_multiplexer_channel:is_initiator:%d, found, state:%d, p_mcb:%p",
158 is_initiator, rfc_cb.port.rfc_mcb[i].state, &rfc_cb.port.rfc_mcb[i]);
159 return (&rfc_cb.port.rfc_mcb[i]);
160 }
161 }
162
163 /* connection with bd_addr does not exist */
164 for (i = 0, j = rfc_cb.rfc.last_mux + 1; i < MAX_BD_CONNECTIONS; i++, j++)
165 {
166 if (j >= MAX_BD_CONNECTIONS)
167 j = 0;
168
169 p_mcb = &rfc_cb.port.rfc_mcb[j];
170 if (rfc_cb.port.rfc_mcb[j].state == RFC_MX_STATE_IDLE)
171 {
172 /* New multiplexer control block */
173 memset (p_mcb, 0, sizeof (tRFC_MCB));
174 memcpy (p_mcb->bd_addr, bd_addr, BD_ADDR_LEN);
175 RFCOMM_TRACE_DEBUG("rfc_alloc_multiplexer_channel:is_initiator:%d, create new p_mcb:%p, index:%d",
176 is_initiator, &rfc_cb.port.rfc_mcb[j], j);
177
178 GKI_init_q(&p_mcb->cmd_q);
179
180 p_mcb->is_initiator = is_initiator;
181
182 rfc_timer_start (p_mcb, RFC_MCB_INIT_INACT_TIMER);
183
184 rfc_cb.rfc.last_mux = (UINT8) j;
185 return (p_mcb);
186 }
187 }
188 return (NULL);
189 }
190
191
192 /*******************************************************************************
193 **
194 ** Function rfc_release_multiplexer_channel
195 **
196 ** Description This function returns existing or new control block for
197 ** the BD_ADDR.
198 **
199 *******************************************************************************/
rfc_release_multiplexer_channel(tRFC_MCB * p_mcb)200 void rfc_release_multiplexer_channel (tRFC_MCB *p_mcb)
201 {
202 void *p_buf;
203
204 rfc_timer_stop (p_mcb);
205
206 while ((p_buf = GKI_dequeue(&p_mcb->cmd_q)) != NULL)
207 GKI_freebuf(p_buf);
208
209 memset (p_mcb, 0, sizeof (tRFC_MCB));
210 p_mcb->state = RFC_MX_STATE_IDLE;
211 }
212
213
214 /*******************************************************************************
215 **
216 ** Function rfc_timer_start
217 **
218 ** Description Start RFC Timer
219 **
220 *******************************************************************************/
rfc_timer_start(tRFC_MCB * p_mcb,UINT16 timeout)221 void rfc_timer_start (tRFC_MCB *p_mcb, UINT16 timeout)
222 {
223 TIMER_LIST_ENT *p_tle = &p_mcb->tle;
224
225 RFCOMM_TRACE_EVENT ("rfc_timer_start - timeout:%d", timeout);
226
227 p_tle->param = (UINT32)p_mcb;
228
229 btu_start_timer (p_tle, BTU_TTYPE_RFCOMM_MFC, timeout);
230 }
231
232
233 /*******************************************************************************
234 **
235 ** Function rfc_timer_stop
236 **
237 ** Description Stop RFC Timer
238 **
239 *******************************************************************************/
rfc_timer_stop(tRFC_MCB * p_mcb)240 void rfc_timer_stop (tRFC_MCB *p_mcb)
241 {
242 RFCOMM_TRACE_EVENT ("rfc_timer_stop");
243
244 btu_stop_timer (&p_mcb->tle);
245 }
246
247
248 /*******************************************************************************
249 **
250 ** Function rfc_port_timer_start
251 **
252 ** Description Start RFC Timer
253 **
254 *******************************************************************************/
rfc_port_timer_start(tPORT * p_port,UINT16 timeout)255 void rfc_port_timer_start (tPORT *p_port, UINT16 timeout)
256 {
257 TIMER_LIST_ENT *p_tle = &p_port->rfc.tle;
258
259 RFCOMM_TRACE_EVENT ("rfc_port_timer_start - timeout:%d", timeout);
260
261 p_tle->param = (UINT32)p_port;
262
263 btu_start_timer (p_tle, BTU_TTYPE_RFCOMM_PORT, timeout);
264 }
265
266
267 /*******************************************************************************
268 **
269 ** Function rfc_port_timer_stop
270 **
271 ** Description Stop RFC Timer
272 **
273 *******************************************************************************/
rfc_port_timer_stop(tPORT * p_port)274 void rfc_port_timer_stop (tPORT *p_port)
275 {
276 RFCOMM_TRACE_EVENT ("rfc_port_timer_stop");
277
278 btu_stop_timer (&p_port->rfc.tle);
279 }
280
281
282 /*******************************************************************************
283 **
284 ** Function rfc_check_mcb_active
285 **
286 ** Description Check if there are any opened ports on the MCB if not
287 ** start MCB Inact timer.
288 **
289 ** Returns void
290 **
291 *******************************************************************************/
rfc_check_mcb_active(tRFC_MCB * p_mcb)292 void rfc_check_mcb_active (tRFC_MCB *p_mcb)
293 {
294 UINT16 i;
295
296 for (i = 0; i < RFCOMM_MAX_DLCI; i++)
297 {
298 if (p_mcb->port_inx[i] != 0)
299 {
300 p_mcb->is_disc_initiator = FALSE;
301 return;
302 }
303 }
304 /* The last port was DISCed. On the client side start disconnecting Mx */
305 /* On the server side start inactivity timer */
306 if (p_mcb->is_disc_initiator)
307 {
308 p_mcb->is_disc_initiator = FALSE;
309 rfc_mx_sm_execute (p_mcb, RFC_MX_EVENT_CLOSE_REQ, NULL);
310 }
311 else
312 rfc_timer_start (p_mcb, RFC_MCB_RELEASE_INACT_TIMER);
313 }
314
315
316 /*******************************************************************************
317 **
318 ** Function rfcomm_process_timeout
319 **
320 ** Description The function called every second to check RFCOMM timers
321 **
322 ** Returns void
323 **
324 *******************************************************************************/
rfcomm_process_timeout(TIMER_LIST_ENT * p_tle)325 void rfcomm_process_timeout (TIMER_LIST_ENT *p_tle)
326 {
327 switch (p_tle->event)
328 {
329 case BTU_TTYPE_RFCOMM_MFC:
330 rfc_mx_sm_execute ((tRFC_MCB *)p_tle->param, RFC_EVENT_TIMEOUT, NULL);
331 break;
332
333 case BTU_TTYPE_RFCOMM_PORT:
334 rfc_port_sm_execute ((tPORT *)p_tle->param, RFC_EVENT_TIMEOUT, NULL);
335 break;
336
337 default:
338 break;
339 }
340 }
341
342
343 /*******************************************************************************
344 **
345 ** Function rfc_sec_check_complete
346 **
347 ** Description The function called when Security Manager finishes
348 ** verification of the service side connection
349 **
350 ** Returns void
351 **
352 *******************************************************************************/
rfc_sec_check_complete(BD_ADDR bd_addr,tBT_TRANSPORT transport,void * p_ref_data,UINT8 res)353 void rfc_sec_check_complete (BD_ADDR bd_addr, tBT_TRANSPORT transport, void *p_ref_data, UINT8 res)
354 {
355 tPORT *p_port = (tPORT *)p_ref_data;
356 UNUSED(bd_addr);
357 UNUSED(transport);
358
359 /* Verify that PORT is still waiting for Security to complete */
360 if (!p_port->in_use
361 || ((p_port->rfc.state != RFC_STATE_ORIG_WAIT_SEC_CHECK)
362 && (p_port->rfc.state != RFC_STATE_TERM_WAIT_SEC_CHECK)))
363 return;
364
365 rfc_port_sm_execute ((tPORT *)p_ref_data, RFC_EVENT_SEC_COMPLETE, &res);
366 }
367
368
369 /*******************************************************************************
370 **
371 ** Function rfc_port_closed
372 **
373 ** Description The function is called when port is released based on the
374 ** event received from the lower layer, typically L2CAP
375 ** connection down, DISC, or DM frame.
376 **
377 ** Returns void
378 **
379 *******************************************************************************/
rfc_port_closed(tPORT * p_port)380 void rfc_port_closed (tPORT *p_port)
381 {
382 tRFC_MCB *p_mcb = p_port->rfc.p_mcb;
383
384 RFCOMM_TRACE_DEBUG ("rfc_port_closed");
385
386 rfc_port_timer_stop (p_port);
387
388 p_port->rfc.state = RFC_STATE_CLOSED;
389
390 /* If multiplexer channel was up mark it as down */
391 if (p_mcb)
392 {
393 p_mcb->port_inx[p_port->dlci] = 0;
394
395 /* If there are no more ports opened on this MCB release it */
396 rfc_check_mcb_active (p_mcb);
397 }
398
399 /* Notify port that RFC connection is gone */
400 port_rfc_closed (p_port, PORT_CLOSED);
401 }
402
403 /*******************************************************************************
404 **
405 ** Function rfc_inc_credit
406 **
407 ** Description The function is called when a credit is received in a UIH
408 ** frame. It increments the TX credit count, and if data
409 ** flow had halted, it restarts it.
410 **
411 ** Returns void
412 **
413 *******************************************************************************/
rfc_inc_credit(tPORT * p_port,UINT8 credit)414 void rfc_inc_credit (tPORT *p_port, UINT8 credit)
415 {
416 if (p_port->rfc.p_mcb->flow == PORT_FC_CREDIT)
417 {
418 p_port->credit_tx += credit;
419
420 RFCOMM_TRACE_EVENT ("rfc_inc_credit:%d", p_port->credit_tx);
421
422 if (p_port->tx.peer_fc == TRUE)
423 PORT_FlowInd(p_port->rfc.p_mcb, p_port->dlci, TRUE);
424 }
425 }
426
427 /*******************************************************************************
428 **
429 ** Function rfc_dec_credit
430 **
431 ** Description The function is called when a UIH frame of user data is
432 ** sent. It decrements the credit count. If credit count
433 ** Reaches zero, peer_fc is set.
434 **
435 ** Returns void
436 **
437 *******************************************************************************/
rfc_dec_credit(tPORT * p_port)438 void rfc_dec_credit (tPORT *p_port)
439 {
440 if (p_port->rfc.p_mcb->flow == PORT_FC_CREDIT)
441 {
442 if (p_port->credit_tx > 0)
443 p_port->credit_tx--;
444
445 if (p_port->credit_tx == 0)
446 p_port->tx.peer_fc = TRUE;
447 }
448 }
449
450
451 /*******************************************************************************
452 **
453 ** Function rfc_check_send_cmd
454 **
455 ** Description This function is called to send an RFCOMM command message
456 ** or to handle the RFCOMM command message queue.
457 **
458 ** Returns void
459 **
460 *******************************************************************************/
rfc_check_send_cmd(tRFC_MCB * p_mcb,BT_HDR * p_buf)461 void rfc_check_send_cmd(tRFC_MCB *p_mcb, BT_HDR *p_buf)
462 {
463 BT_HDR *p;
464
465 /* if passed a buffer queue it */
466 if (p_buf != NULL)
467 {
468 GKI_enqueue(&p_mcb->cmd_q, p_buf);
469 }
470
471 /* handle queue if L2CAP not congested */
472 while (p_mcb->l2cap_congested == FALSE)
473 {
474 if ((p = (BT_HDR *) GKI_dequeue(&p_mcb->cmd_q)) == NULL)
475 {
476 break;
477 }
478
479
480 L2CA_DataWrite (p_mcb->lcid, p);
481 }
482 }
483
484
485