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[] =
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,
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,
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,
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
71 /*******************************************************************************
73 ** Function rfc_calc_fcs
75 ** Description This function calculate FCS for the RFCOMM frame
76 ** (GSM 07.10 TS 101 369 V6.3.0)
78 ** Input len - number of bytes in the message
79 ** p - points to message
81 *******************************************************************************/
82 UINT8 rfc_calc_fcs (UINT16 len, UINT8 *p)
88 fcs = rfc_crctable[fcs ^ *p++];
96 /*******************************************************************************
98 ** Function rfc_check_fcs
100 ** Description This function checks FCS for the RFCOMM frame
101 ** (GSM 07.10 TS 101 369 V6.3.0)
103 ** Input len - number of bytes in the message
104 ** p - points to message
105 ** received_fcs - received FCS
107 *******************************************************************************/
108 BOOLEAN rfc_check_fcs (UINT16 len, UINT8 *p, UINT8 received_fcs)
114 fcs = rfc_crctable[fcs ^ *p++];
117 /* Ones compliment */
118 fcs = rfc_crctable[fcs ^ received_fcs];
120 /*0xCF is the reversed order of 11110011.*/
121 return (fcs == 0xCF);
125 /*******************************************************************************
127 ** Function rfc_alloc_multiplexer_channel
129 ** Description This function returns existing or new control block for
132 *******************************************************************************/
133 tRFC_MCB *rfc_alloc_multiplexer_channel (BD_ADDR bd_addr, BOOLEAN is_initiator)
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);
141 for (i = 0; i < MAX_BD_CONNECTIONS; i++)
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]);
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)))
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]);
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++)
166 if (j >= MAX_BD_CONNECTIONS)
169 p_mcb = &rfc_cb.port.rfc_mcb[j];
170 if (rfc_cb.port.rfc_mcb[j].state == RFC_MX_STATE_IDLE)
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);
178 GKI_init_q(&p_mcb->cmd_q);
180 p_mcb->is_initiator = is_initiator;
182 rfc_timer_start (p_mcb, RFC_MCB_INIT_INACT_TIMER);
184 rfc_cb.rfc.last_mux = (UINT8) j;
192 /*******************************************************************************
194 ** Function rfc_release_multiplexer_channel
196 ** Description This function returns existing or new control block for
199 *******************************************************************************/
200 void rfc_release_multiplexer_channel (tRFC_MCB *p_mcb)
204 rfc_timer_stop (p_mcb);
206 while ((p_buf = GKI_dequeue(&p_mcb->cmd_q)) != NULL)
209 memset (p_mcb, 0, sizeof (tRFC_MCB));
210 p_mcb->state = RFC_MX_STATE_IDLE;
214 /*******************************************************************************
216 ** Function rfc_timer_start
218 ** Description Start RFC Timer
220 *******************************************************************************/
221 void rfc_timer_start (tRFC_MCB *p_mcb, UINT16 timeout)
223 TIMER_LIST_ENT *p_tle = &p_mcb->tle;
225 RFCOMM_TRACE_EVENT ("rfc_timer_start - timeout:%d", timeout);
227 p_tle->param = (UINT32)p_mcb;
229 btu_start_timer (p_tle, BTU_TTYPE_RFCOMM_MFC, timeout);
233 /*******************************************************************************
235 ** Function rfc_timer_stop
237 ** Description Stop RFC Timer
239 *******************************************************************************/
240 void rfc_timer_stop (tRFC_MCB *p_mcb)
242 RFCOMM_TRACE_EVENT ("rfc_timer_stop");
244 btu_stop_timer (&p_mcb->tle);
248 /*******************************************************************************
250 ** Function rfc_port_timer_start
252 ** Description Start RFC Timer
254 *******************************************************************************/
255 void rfc_port_timer_start (tPORT *p_port, UINT16 timeout)
257 TIMER_LIST_ENT *p_tle = &p_port->rfc.tle;
259 RFCOMM_TRACE_EVENT ("rfc_port_timer_start - timeout:%d", timeout);
261 p_tle->param = (UINT32)p_port;
263 btu_start_timer (p_tle, BTU_TTYPE_RFCOMM_PORT, timeout);
267 /*******************************************************************************
269 ** Function rfc_port_timer_stop
271 ** Description Stop RFC Timer
273 *******************************************************************************/
274 void rfc_port_timer_stop (tPORT *p_port)
276 RFCOMM_TRACE_EVENT ("rfc_port_timer_stop");
278 btu_stop_timer (&p_port->rfc.tle);
282 /*******************************************************************************
284 ** Function rfc_check_mcb_active
286 ** Description Check if there are any opened ports on the MCB if not
287 ** start MCB Inact timer.
291 *******************************************************************************/
292 void rfc_check_mcb_active (tRFC_MCB *p_mcb)
296 for (i = 0; i < RFCOMM_MAX_DLCI; i++)
298 if (p_mcb->port_inx[i] != 0)
300 p_mcb->is_disc_initiator = FALSE;
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)
308 p_mcb->is_disc_initiator = FALSE;
309 rfc_mx_sm_execute (p_mcb, RFC_MX_EVENT_CLOSE_REQ, NULL);
312 rfc_timer_start (p_mcb, RFC_MCB_RELEASE_INACT_TIMER);
316 /*******************************************************************************
318 ** Function rfcomm_process_timeout
320 ** Description The function called every second to check RFCOMM timers
324 *******************************************************************************/
325 void rfcomm_process_timeout (TIMER_LIST_ENT *p_tle)
327 switch (p_tle->event)
329 case BTU_TTYPE_RFCOMM_MFC:
330 rfc_mx_sm_execute ((tRFC_MCB *)p_tle->param, RFC_EVENT_TIMEOUT, NULL);
333 case BTU_TTYPE_RFCOMM_PORT:
334 rfc_port_sm_execute ((tPORT *)p_tle->param, RFC_EVENT_TIMEOUT, NULL);
343 /*******************************************************************************
345 ** Function rfc_sec_check_complete
347 ** Description The function called when Security Manager finishes
348 ** verification of the service side connection
352 *******************************************************************************/
353 void rfc_sec_check_complete (BD_ADDR bd_addr, tBT_TRANSPORT transport, void *p_ref_data, UINT8 res)
355 tPORT *p_port = (tPORT *)p_ref_data;
359 /* Verify that PORT is still waiting for Security to complete */
361 || ((p_port->rfc.state != RFC_STATE_ORIG_WAIT_SEC_CHECK)
362 && (p_port->rfc.state != RFC_STATE_TERM_WAIT_SEC_CHECK)))
365 rfc_port_sm_execute ((tPORT *)p_ref_data, RFC_EVENT_SEC_COMPLETE, &res);
369 /*******************************************************************************
371 ** Function rfc_port_closed
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.
379 *******************************************************************************/
380 void rfc_port_closed (tPORT *p_port)
382 tRFC_MCB *p_mcb = p_port->rfc.p_mcb;
384 RFCOMM_TRACE_DEBUG ("rfc_port_closed");
386 rfc_port_timer_stop (p_port);
388 p_port->rfc.state = RFC_STATE_CLOSED;
390 /* If multiplexer channel was up mark it as down */
393 p_mcb->port_inx[p_port->dlci] = 0;
395 /* If there are no more ports opened on this MCB release it */
396 rfc_check_mcb_active (p_mcb);
399 /* Notify port that RFC connection is gone */
400 port_rfc_closed (p_port, PORT_CLOSED);
403 /*******************************************************************************
405 ** Function rfc_inc_credit
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.
413 *******************************************************************************/
414 void rfc_inc_credit (tPORT *p_port, UINT8 credit)
416 if (p_port->rfc.p_mcb->flow == PORT_FC_CREDIT)
418 p_port->credit_tx += credit;
420 RFCOMM_TRACE_EVENT ("rfc_inc_credit:%d", p_port->credit_tx);
422 if (p_port->tx.peer_fc == TRUE)
423 PORT_FlowInd(p_port->rfc.p_mcb, p_port->dlci, TRUE);
427 /*******************************************************************************
429 ** Function rfc_dec_credit
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.
437 *******************************************************************************/
438 void rfc_dec_credit (tPORT *p_port)
440 if (p_port->rfc.p_mcb->flow == PORT_FC_CREDIT)
442 if (p_port->credit_tx > 0)
445 if (p_port->credit_tx == 0)
446 p_port->tx.peer_fc = TRUE;
451 /*******************************************************************************
453 ** Function rfc_check_send_cmd
455 ** Description This function is called to send an RFCOMM command message
456 ** or to handle the RFCOMM command message queue.
460 *******************************************************************************/
461 void rfc_check_send_cmd(tRFC_MCB *p_mcb, BT_HDR *p_buf)
465 /* if passed a buffer queue it */
468 GKI_enqueue(&p_mcb->cmd_q, p_buf);
471 /* handle queue if L2CAP not congested */
472 while (p_mcb->l2cap_congested == FALSE)
474 if ((p = (BT_HDR *) GKI_dequeue(&p_mcb->cmd_q)) == NULL)
480 L2CA_DataWrite (p_mcb->lcid, p);