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 *******************************************************************************/ 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 *******************************************************************************/ 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 *******************************************************************************/ 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 *******************************************************************************/ 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 *******************************************************************************/ 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 *******************************************************************************/ 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 *******************************************************************************/ 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 *******************************************************************************/ 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 *******************************************************************************/ 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 *******************************************************************************/ 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 *******************************************************************************/ 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 *******************************************************************************/ 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 *******************************************************************************/ 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 *******************************************************************************/ 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 *******************************************************************************/ 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
