1 /******************************************************************************
3 * Copyright (C) 1999-2012 Broadcom Corporation
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:
9 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 ******************************************************************************/
19 /*****************************************************************************
21 * This file contains collection of utility functions used the RFCOMM unit
23 *****************************************************************************/
25 #include "bt_target.h"
40 /*******************************************************************************
42 ** Function rfc_calc_fcs
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 0x00, 0x91, 0xE3, 0x72, 0x07, 0x96, 0xE4, 0x75, 0x0E, 0x9F, 0xED, 0x7C, 0x09, 0x98, 0xEA, 0x7B,
49 0x1C, 0x8D, 0xFF, 0x6E, 0x1B, 0x8A, 0xF8, 0x69, 0x12, 0x83, 0xF1, 0x60, 0x15, 0x84, 0xF6, 0x67,
50 0x38, 0xA9, 0xDB, 0x4A, 0x3F, 0xAE, 0xDC, 0x4D, 0x36, 0xA7, 0xD5, 0x44, 0x31, 0xA0, 0xD2, 0x43,
51 0x24, 0xB5, 0xC7, 0x56, 0x23, 0xB2, 0xC0, 0x51, 0x2A, 0xBB, 0xC9, 0x58, 0x2D, 0xBC, 0xCE, 0x5F,
53 0x70, 0xE1, 0x93, 0x02, 0x77, 0xE6, 0x94, 0x05, 0x7E, 0xEF, 0x9D, 0x0C, 0x79, 0xE8, 0x9A, 0x0B,
54 0x6C, 0xFD, 0x8F, 0x1E, 0x6B, 0xFA, 0x88, 0x19, 0x62, 0xF3, 0x81, 0x10, 0x65, 0xF4, 0x86, 0x17,
55 0x48, 0xD9, 0xAB, 0x3A, 0x4F, 0xDE, 0xAC, 0x3D, 0x46, 0xD7, 0xA5, 0x34, 0x41, 0xD0, 0xA2, 0x33,
56 0x54, 0xC5, 0xB7, 0x26, 0x53, 0xC2, 0xB0, 0x21, 0x5A, 0xCB, 0xB9, 0x28, 0x5D, 0xCC, 0xBE, 0x2F,
58 0xE0, 0x71, 0x03, 0x92, 0xE7, 0x76, 0x04, 0x95, 0xEE, 0x7F, 0x0D, 0x9C, 0xE9, 0x78, 0x0A, 0x9B,
59 0xFC, 0x6D, 0x1F, 0x8E, 0xFB, 0x6A, 0x18, 0x89, 0xF2, 0x63, 0x11, 0x80, 0xF5, 0x64, 0x16, 0x87,
60 0xD8, 0x49, 0x3B, 0xAA, 0xDF, 0x4E, 0x3C, 0xAD, 0xD6, 0x47, 0x35, 0xA4, 0xD1, 0x40, 0x32, 0xA3,
61 0xC4, 0x55, 0x27, 0xB6, 0xC3, 0x52, 0x20, 0xB1, 0xCA, 0x5B, 0x29, 0xB8, 0xCD, 0x5C, 0x2E, 0xBF,
63 0x90, 0x01, 0x73, 0xE2, 0x97, 0x06, 0x74, 0xE5, 0x9E, 0x0F, 0x7D, 0xEC, 0x99, 0x08, 0x7A, 0xEB,
64 0x8C, 0x1D, 0x6F, 0xFE, 0x8B, 0x1A, 0x68, 0xF9, 0x82, 0x13, 0x61, 0xF0, 0x85, 0x14, 0x66, 0xF7,
65 0xA8, 0x39, 0x4B, 0xDA, 0xAF, 0x3E, 0x4C, 0xDD, 0xA6, 0x37, 0x45, 0xD4, 0xA1, 0x30, 0x42, 0xD3,
66 0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1, 0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF
70 /*******************************************************************************
72 ** Function rfc_calc_fcs
74 ** Description This function calculate FCS for the RFCOMM frame
75 ** (GSM 07.10 TS 101 369 V6.3.0)
77 ** Input len - number of bytes in the message
78 ** p - points to message
80 *******************************************************************************/
81 UINT8 rfc_calc_fcs (UINT16 len, UINT8 *p)
86 fcs = rfc_crctable[fcs ^ *p++];
94 /*******************************************************************************
96 ** Function rfc_check_fcs
98 ** Description This function checks FCS for the RFCOMM frame
99 ** (GSM 07.10 TS 101 369 V6.3.0)
101 ** Input len - number of bytes in the message
102 ** p - points to message
103 ** received_fcs - received FCS
105 *******************************************************************************/
106 BOOLEAN rfc_check_fcs (UINT16 len, UINT8 *p, UINT8 received_fcs)
111 fcs = rfc_crctable[fcs ^ *p++];
114 /* Ones compliment */
115 fcs = rfc_crctable[fcs ^ received_fcs];
117 /*0xCF is the reversed order of 11110011.*/
118 return (fcs == 0xCF);
122 /*******************************************************************************
124 ** Function rfc_alloc_multiplexer_channel
126 ** Description This function returns existing or new control block for
129 *******************************************************************************/
130 tRFC_MCB *rfc_alloc_multiplexer_channel (BD_ADDR bd_addr, BOOLEAN is_initiator)
133 tRFC_MCB *p_mcb = NULL;
134 RFCOMM_TRACE_DEBUG("rfc_alloc_multiplexer_channel: bd_addr:%02x:%02x:%02x:%02x:%02x:%02x",
135 bd_addr[0], bd_addr[1], bd_addr[2], bd_addr[3], bd_addr[4], bd_addr[5]);
136 RFCOMM_TRACE_DEBUG("rfc_alloc_multiplexer_channel:is_initiator:%d", is_initiator);
138 for (i = 0; i < MAX_BD_CONNECTIONS; i++) {
139 RFCOMM_TRACE_DEBUG("rfc_alloc_multiplexer_channel rfc_cb.port.rfc_mcb[%d].state:%d",
140 i, rfc_cb.port.rfc_mcb[i].state);
141 RFCOMM_TRACE_DEBUG("(rfc_cb.port.rfc_mcb[i].bd_addr:%02x:%02x:%02x:%02x:%02x:%02x",
142 rfc_cb.port.rfc_mcb[i].bd_addr[0], rfc_cb.port.rfc_mcb[i].bd_addr[1],
143 rfc_cb.port.rfc_mcb[i].bd_addr[2], rfc_cb.port.rfc_mcb[i].bd_addr[3],
144 rfc_cb.port.rfc_mcb[i].bd_addr[4], rfc_cb.port.rfc_mcb[i].bd_addr[5]);
146 if ((rfc_cb.port.rfc_mcb[i].state != RFC_MX_STATE_IDLE)
147 && (!memcmp (rfc_cb.port.rfc_mcb[i].bd_addr, bd_addr, BD_ADDR_LEN))) {
148 /* Multiplexer channel found do not change anything */
149 /* If there was an inactivity timer running stop it now */
150 if (rfc_cb.port.rfc_mcb[i].state == RFC_MX_STATE_CONNECTED) {
151 rfc_timer_stop (&rfc_cb.port.rfc_mcb[i]);
153 RFCOMM_TRACE_DEBUG("rfc_alloc_multiplexer_channel:is_initiator:%d, found, state:%d, p_mcb:%p",
154 is_initiator, rfc_cb.port.rfc_mcb[i].state, &rfc_cb.port.rfc_mcb[i]);
155 return (&rfc_cb.port.rfc_mcb[i]);
159 /* connection with bd_addr does not exist */
160 for (i = 0, j = rfc_cb.rfc.last_mux + 1; i < MAX_BD_CONNECTIONS; i++, j++) {
161 if (j >= MAX_BD_CONNECTIONS) {
165 p_mcb = &rfc_cb.port.rfc_mcb[j];
166 if (rfc_cb.port.rfc_mcb[j].state == RFC_MX_STATE_IDLE) {
167 /* New multiplexer control block */
168 memset (p_mcb, 0, sizeof (tRFC_MCB));
169 memcpy (p_mcb->bd_addr, bd_addr, BD_ADDR_LEN);
170 RFCOMM_TRACE_DEBUG("rfc_alloc_multiplexer_channel:is_initiator:%d, create new p_mcb:%p, index:%d",
171 is_initiator, &rfc_cb.port.rfc_mcb[j], j);
173 GKI_init_q(&p_mcb->cmd_q);
175 p_mcb->is_initiator = is_initiator;
177 rfc_timer_start (p_mcb, RFC_MCB_INIT_INACT_TIMER);
179 rfc_cb.rfc.last_mux = (UINT8) j;
187 /*******************************************************************************
189 ** Function rfc_release_multiplexer_channel
191 ** Description This function returns existing or new control block for
194 *******************************************************************************/
195 void rfc_release_multiplexer_channel (tRFC_MCB *p_mcb)
199 rfc_timer_stop (p_mcb);
201 while ((p_buf = GKI_dequeue(&p_mcb->cmd_q)) != NULL) {
205 memset (p_mcb, 0, sizeof (tRFC_MCB));
206 p_mcb->state = RFC_MX_STATE_IDLE;
210 /*******************************************************************************
212 ** Function rfc_timer_start
214 ** Description Start RFC Timer
216 *******************************************************************************/
217 void rfc_timer_start (tRFC_MCB *p_mcb, UINT16 timeout)
219 TIMER_LIST_ENT *p_tle = &p_mcb->tle;
221 RFCOMM_TRACE_EVENT ("rfc_timer_start - timeout:%d", timeout);
223 p_tle->param = (UINT32)p_mcb;
225 btu_start_timer (p_tle, BTU_TTYPE_RFCOMM_MFC, timeout);
229 /*******************************************************************************
231 ** Function rfc_timer_stop
233 ** Description Stop RFC Timer
235 *******************************************************************************/
236 void rfc_timer_stop (tRFC_MCB *p_mcb)
238 RFCOMM_TRACE_EVENT ("rfc_timer_stop");
240 btu_stop_timer (&p_mcb->tle);
244 /*******************************************************************************
246 ** Function rfc_port_timer_start
248 ** Description Start RFC Timer
250 *******************************************************************************/
251 void rfc_port_timer_start (tPORT *p_port, UINT16 timeout)
253 TIMER_LIST_ENT *p_tle = &p_port->rfc.tle;
255 RFCOMM_TRACE_EVENT ("rfc_port_timer_start - timeout:%d", timeout);
257 p_tle->param = (UINT32)p_port;
259 btu_start_timer (p_tle, BTU_TTYPE_RFCOMM_PORT, timeout);
263 /*******************************************************************************
265 ** Function rfc_port_timer_stop
267 ** Description Stop RFC Timer
269 *******************************************************************************/
270 void rfc_port_timer_stop (tPORT *p_port)
272 RFCOMM_TRACE_EVENT ("rfc_port_timer_stop");
274 btu_stop_timer (&p_port->rfc.tle);
278 /*******************************************************************************
280 ** Function rfc_check_mcb_active
282 ** Description Check if there are any opened ports on the MCB if not
283 ** start MCB Inact timer.
287 *******************************************************************************/
288 void rfc_check_mcb_active (tRFC_MCB *p_mcb)
292 for (i = 0; i < RFCOMM_MAX_DLCI; i++) {
293 if (p_mcb->port_inx[i] != 0) {
294 p_mcb->is_disc_initiator = FALSE;
298 /* The last port was DISCed. On the client side start disconnecting Mx */
299 /* On the server side start inactivity timer */
300 if (p_mcb->is_disc_initiator) {
301 p_mcb->is_disc_initiator = FALSE;
302 rfc_mx_sm_execute (p_mcb, RFC_MX_EVENT_CLOSE_REQ, NULL);
304 rfc_timer_start (p_mcb, RFC_MCB_RELEASE_INACT_TIMER);
309 /*******************************************************************************
311 ** Function rfcomm_process_timeout
313 ** Description The function called every second to check RFCOMM timers
317 *******************************************************************************/
318 void rfcomm_process_timeout (TIMER_LIST_ENT *p_tle)
320 switch (p_tle->event) {
321 case BTU_TTYPE_RFCOMM_MFC:
322 rfc_mx_sm_execute ((tRFC_MCB *)p_tle->param, RFC_EVENT_TIMEOUT, NULL);
325 case BTU_TTYPE_RFCOMM_PORT:
326 rfc_port_sm_execute ((tPORT *)p_tle->param, RFC_EVENT_TIMEOUT, NULL);
335 /*******************************************************************************
337 ** Function rfc_sec_check_complete
339 ** Description The function called when Security Manager finishes
340 ** verification of the service side connection
344 *******************************************************************************/
345 void rfc_sec_check_complete (BD_ADDR bd_addr, tBT_TRANSPORT transport, void *p_ref_data, UINT8 res)
347 tPORT *p_port = (tPORT *)p_ref_data;
351 /* Verify that PORT is still waiting for Security to complete */
353 || ((p_port->rfc.state != RFC_STATE_ORIG_WAIT_SEC_CHECK)
354 && (p_port->rfc.state != RFC_STATE_TERM_WAIT_SEC_CHECK))) {
358 rfc_port_sm_execute ((tPORT *)p_ref_data, RFC_EVENT_SEC_COMPLETE, &res);
362 /*******************************************************************************
364 ** Function rfc_port_closed
366 ** Description The function is called when port is released based on the
367 ** event received from the lower layer, typically L2CAP
368 ** connection down, DISC, or DM frame.
372 *******************************************************************************/
373 void rfc_port_closed (tPORT *p_port)
375 tRFC_MCB *p_mcb = p_port->rfc.p_mcb;
377 RFCOMM_TRACE_DEBUG ("rfc_port_closed");
379 rfc_port_timer_stop (p_port);
381 p_port->rfc.state = RFC_STATE_CLOSED;
383 /* If multiplexer channel was up mark it as down */
385 p_mcb->port_inx[p_port->dlci] = 0;
387 /* If there are no more ports opened on this MCB release it */
388 rfc_check_mcb_active (p_mcb);
391 /* Notify port that RFC connection is gone */
392 port_rfc_closed (p_port, PORT_CLOSED);
395 /*******************************************************************************
397 ** Function rfc_inc_credit
399 ** Description The function is called when a credit is received in a UIH
400 ** frame. It increments the TX credit count, and if data
401 ** flow had halted, it restarts it.
405 *******************************************************************************/
406 void rfc_inc_credit (tPORT *p_port, UINT8 credit)
408 if (p_port->rfc.p_mcb->flow == PORT_FC_CREDIT) {
409 p_port->credit_tx += credit;
411 RFCOMM_TRACE_EVENT ("rfc_inc_credit:%d", p_port->credit_tx);
413 if (p_port->tx.peer_fc == TRUE) {
414 PORT_FlowInd(p_port->rfc.p_mcb, p_port->dlci, TRUE);
419 /*******************************************************************************
421 ** Function rfc_dec_credit
423 ** Description The function is called when a UIH frame of user data is
424 ** sent. It decrements the credit count. If credit count
425 ** Reaches zero, peer_fc is set.
429 *******************************************************************************/
430 void rfc_dec_credit (tPORT *p_port)
432 if (p_port->rfc.p_mcb->flow == PORT_FC_CREDIT) {
433 if (p_port->credit_tx > 0) {
437 if (p_port->credit_tx == 0) {
438 p_port->tx.peer_fc = TRUE;
444 /*******************************************************************************
446 ** Function rfc_check_send_cmd
448 ** Description This function is called to send an RFCOMM command message
449 ** or to handle the RFCOMM command message queue.
453 *******************************************************************************/
454 void rfc_check_send_cmd(tRFC_MCB *p_mcb, BT_HDR *p_buf)
458 /* if passed a buffer queue it */
460 GKI_enqueue(&p_mcb->cmd_q, p_buf);
463 /* handle queue if L2CAP not congested */
464 while (p_mcb->l2cap_congested == FALSE) {
465 if ((p = (BT_HDR *) GKI_dequeue(&p_mcb->cmd_q)) == NULL) {
470 L2CA_DataWrite (p_mcb->lcid, p);