1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 /* 39 * hci.c 40 * 41 * Created by Matthias Ringwald on 4/29/09. 42 * 43 */ 44 45 #include "btstack-config.h" 46 47 #include "hci.h" 48 #include "gap.h" 49 50 #include <stdarg.h> 51 #include <string.h> 52 #include <stdio.h> 53 54 #ifndef EMBEDDED 55 #ifdef _WIN32 56 #include "Winsock2.h" 57 #else 58 #include <unistd.h> // gethostbyname 59 #endif 60 #include <btstack/version.h> 61 #endif 62 63 #include "btstack_memory.h" 64 #include "debug.h" 65 #include "hci_dump.h" 66 67 #include <btstack/linked_list.h> 68 #include <btstack/hci_cmds.h> 69 70 #define HCI_CONNECTION_TIMEOUT_MS 10000 71 72 #define HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP 11 73 74 #ifdef USE_BLUETOOL 75 #include "../platforms/ios/src/bt_control_iphone.h" 76 #endif 77 78 static void hci_update_scan_enable(void); 79 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection); 80 static void hci_connection_timeout_handler(timer_source_t *timer); 81 static void hci_connection_timestamp(hci_connection_t *connection); 82 static int hci_power_control_on(void); 83 static void hci_power_control_off(void); 84 static void hci_state_reset(); 85 86 // the STACK is here 87 #ifndef HAVE_MALLOC 88 static hci_stack_t hci_stack_static; 89 #endif 90 static hci_stack_t * hci_stack = NULL; 91 92 // test helper 93 static uint8_t disable_l2cap_timeouts = 0; 94 95 /** 96 * create connection for given address 97 * 98 * @return connection OR NULL, if no memory left 99 */ 100 static hci_connection_t * create_connection_for_bd_addr_and_type(bd_addr_t addr, bd_addr_type_t addr_type){ 101 log_info("create_connection_for_addr %s, type %x", bd_addr_to_str(addr), addr_type); 102 hci_connection_t * conn = btstack_memory_hci_connection_get(); 103 if (!conn) return NULL; 104 memset(conn, 0, sizeof(hci_connection_t)); 105 BD_ADDR_COPY(conn->address, addr); 106 conn->address_type = addr_type; 107 conn->con_handle = 0xffff; 108 conn->authentication_flags = AUTH_FLAGS_NONE; 109 conn->bonding_flags = 0; 110 conn->requested_security_level = LEVEL_0; 111 linked_item_set_user(&conn->timeout.item, conn); 112 conn->timeout.process = hci_connection_timeout_handler; 113 hci_connection_timestamp(conn); 114 conn->acl_recombination_length = 0; 115 conn->acl_recombination_pos = 0; 116 conn->num_acl_packets_sent = 0; 117 conn->num_sco_packets_sent = 0; 118 conn->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 119 linked_list_add(&hci_stack->connections, (linked_item_t *) conn); 120 return conn; 121 } 122 123 124 /** 125 * get le connection parameter range 126 * 127 * @return le connection parameter range struct 128 */ 129 le_connection_parameter_range_t gap_le_get_connection_parameter_range(){ 130 return hci_stack->le_connection_parameter_range; 131 } 132 133 /** 134 * set le connection parameter range 135 * 136 */ 137 138 void gap_le_set_connection_parameter_range(le_connection_parameter_range_t range){ 139 hci_stack->le_connection_parameter_range.le_conn_interval_min = range.le_conn_interval_min; 140 hci_stack->le_connection_parameter_range.le_conn_interval_max = range.le_conn_interval_max; 141 hci_stack->le_connection_parameter_range.le_conn_interval_min = range.le_conn_latency_min; 142 hci_stack->le_connection_parameter_range.le_conn_interval_max = range.le_conn_latency_max; 143 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = range.le_supervision_timeout_min; 144 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = range.le_supervision_timeout_max; 145 } 146 147 /** 148 * get hci connections iterator 149 * 150 * @return hci connections iterator 151 */ 152 153 void hci_connections_get_iterator(linked_list_iterator_t *it){ 154 linked_list_iterator_init(it, &hci_stack->connections); 155 } 156 157 /** 158 * get connection for a given handle 159 * 160 * @return connection OR NULL, if not found 161 */ 162 hci_connection_t * hci_connection_for_handle(hci_con_handle_t con_handle){ 163 linked_list_iterator_t it; 164 linked_list_iterator_init(&it, &hci_stack->connections); 165 while (linked_list_iterator_has_next(&it)){ 166 hci_connection_t * item = (hci_connection_t *) linked_list_iterator_next(&it); 167 if ( item->con_handle == con_handle ) { 168 return item; 169 } 170 } 171 return NULL; 172 } 173 174 /** 175 * get connection for given address 176 * 177 * @return connection OR NULL, if not found 178 */ 179 hci_connection_t * hci_connection_for_bd_addr_and_type(bd_addr_t * addr, bd_addr_type_t addr_type){ 180 linked_list_iterator_t it; 181 linked_list_iterator_init(&it, &hci_stack->connections); 182 while (linked_list_iterator_has_next(&it)){ 183 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 184 if (connection->address_type != addr_type) continue; 185 if (memcmp(addr, connection->address, 6) != 0) continue; 186 return connection; 187 } 188 return NULL; 189 } 190 191 static void hci_connection_timeout_handler(timer_source_t *timer){ 192 hci_connection_t * connection = (hci_connection_t *) linked_item_get_user(&timer->item); 193 #ifdef HAVE_TIME 194 struct timeval tv; 195 gettimeofday(&tv, NULL); 196 if (tv.tv_sec >= connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000) { 197 // connections might be timed out 198 hci_emit_l2cap_check_timeout(connection); 199 } 200 #endif 201 #ifdef HAVE_TICK 202 if (embedded_get_ticks() > connection->timestamp + embedded_ticks_for_ms(HCI_CONNECTION_TIMEOUT_MS)){ 203 // connections might be timed out 204 hci_emit_l2cap_check_timeout(connection); 205 } 206 #endif 207 run_loop_set_timer(timer, HCI_CONNECTION_TIMEOUT_MS); 208 run_loop_add_timer(timer); 209 } 210 211 static void hci_connection_timestamp(hci_connection_t *connection){ 212 #ifdef HAVE_TIME 213 gettimeofday(&connection->timestamp, NULL); 214 #endif 215 #ifdef HAVE_TICK 216 connection->timestamp = embedded_get_ticks(); 217 #endif 218 } 219 220 221 inline static void connectionSetAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 222 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags | flags); 223 } 224 225 inline static void connectionClearAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 226 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags & ~flags); 227 } 228 229 230 /** 231 * add authentication flags and reset timer 232 * @note: assumes classic connection 233 */ 234 static void hci_add_connection_flags_for_flipped_bd_addr(uint8_t *bd_addr, hci_authentication_flags_t flags){ 235 bd_addr_t addr; 236 bt_flip_addr(addr, *(bd_addr_t *) bd_addr); 237 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 238 if (conn) { 239 connectionSetAuthenticationFlags(conn, flags); 240 hci_connection_timestamp(conn); 241 } 242 } 243 244 int hci_authentication_active_for_handle(hci_con_handle_t handle){ 245 hci_connection_t * conn = hci_connection_for_handle(handle); 246 if (!conn) return 0; 247 if (conn->authentication_flags & LEGACY_PAIRING_ACTIVE) return 1; 248 if (conn->authentication_flags & SSP_PAIRING_ACTIVE) return 1; 249 return 0; 250 } 251 252 void hci_drop_link_key_for_bd_addr(bd_addr_t *addr){ 253 if (hci_stack->remote_device_db) { 254 hci_stack->remote_device_db->delete_link_key(addr); 255 } 256 } 257 258 int hci_is_le_connection(hci_connection_t * connection){ 259 return connection->address_type == BD_ADDR_TYPE_LE_PUBLIC || 260 connection->address_type == BD_ADDR_TYPE_LE_RANDOM; 261 } 262 263 264 /** 265 * count connections 266 */ 267 static int nr_hci_connections(void){ 268 int count = 0; 269 linked_item_t *it; 270 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next, count++); 271 return count; 272 } 273 274 /** 275 * Dummy handler called by HCI 276 */ 277 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 278 } 279 280 uint8_t hci_number_outgoing_packets(hci_con_handle_t handle){ 281 hci_connection_t * connection = hci_connection_for_handle(handle); 282 if (!connection) { 283 log_error("hci_number_outgoing_packets: connection for handle %u does not exist!", handle); 284 return 0; 285 } 286 return connection->num_acl_packets_sent; 287 } 288 289 uint8_t hci_number_free_acl_slots_for_handle(hci_con_handle_t con_handle){ 290 291 int num_packets_sent_classic = 0; 292 int num_packets_sent_le = 0; 293 294 bd_addr_type_t address_type = BD_ADDR_TYPE_UNKNOWN; 295 296 linked_item_t *it; 297 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 298 hci_connection_t * connection = (hci_connection_t *) it; 299 if (connection->address_type == BD_ADDR_TYPE_CLASSIC){ 300 num_packets_sent_classic += connection->num_acl_packets_sent; 301 } else { 302 num_packets_sent_le += connection->num_acl_packets_sent; 303 } 304 // ignore connections that are not open, e.g., in state RECEIVED_DISCONNECTION_COMPLETE 305 if (connection->con_handle == con_handle && connection->state == OPEN){ 306 address_type = connection->address_type; 307 } 308 } 309 310 int free_slots_classic = hci_stack->acl_packets_total_num - num_packets_sent_classic; 311 int free_slots_le = 0; 312 313 if (free_slots_classic < 0){ 314 log_error("hci_number_free_acl_slots: outgoing classic packets (%u) > total classic packets (%u)", num_packets_sent_classic, hci_stack->acl_packets_total_num); 315 return 0; 316 } 317 318 if (hci_stack->le_acl_packets_total_num){ 319 // if we have LE slots, they are used 320 free_slots_le = hci_stack->le_acl_packets_total_num - num_packets_sent_le; 321 if (free_slots_le < 0){ 322 log_error("hci_number_free_acl_slots: outgoing le packets (%u) > total le packets (%u)", num_packets_sent_le, hci_stack->le_acl_packets_total_num); 323 return 0; 324 } 325 } else { 326 // otherwise, classic slots are used for LE, too 327 free_slots_classic -= num_packets_sent_le; 328 if (free_slots_classic < 0){ 329 log_error("hci_number_free_acl_slots: outgoing classic + le packets (%u + %u) > total packets (%u)", num_packets_sent_classic, num_packets_sent_le, hci_stack->acl_packets_total_num); 330 return 0; 331 } 332 } 333 334 switch (address_type){ 335 case BD_ADDR_TYPE_UNKNOWN: 336 log_error("hci_number_free_acl_slots: handle 0x%04x not in connection list", con_handle); 337 return 0; 338 339 case BD_ADDR_TYPE_CLASSIC: 340 return free_slots_classic; 341 342 default: 343 if (hci_stack->le_acl_packets_total_num){ 344 return free_slots_le; 345 } 346 return free_slots_classic; 347 } 348 } 349 350 int hci_number_free_sco_slots_for_handle(hci_con_handle_t handle){ 351 int num_sco_packets_sent = 0; 352 linked_item_t *it; 353 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 354 hci_connection_t * connection = (hci_connection_t *) it; 355 num_sco_packets_sent += connection->num_sco_packets_sent; 356 } 357 if (num_sco_packets_sent > hci_stack->sco_packets_total_num){ 358 log_info("hci_number_free_sco_slots_for_handle: outgoing packets (%u) > total packets ()", num_sco_packets_sent, hci_stack->sco_packets_total_num); 359 return 0; 360 } 361 return hci_stack->sco_packets_total_num - num_sco_packets_sent; 362 } 363 364 // new functions replacing hci_can_send_packet_now[_using_packet_buffer] 365 int hci_can_send_command_packet_now(void){ 366 if (hci_stack->hci_packet_buffer_reserved) return 0; 367 368 // check for async hci transport implementations 369 if (hci_stack->hci_transport->can_send_packet_now){ 370 if (!hci_stack->hci_transport->can_send_packet_now(HCI_COMMAND_DATA_PACKET)){ 371 return 0; 372 } 373 } 374 375 return hci_stack->num_cmd_packets > 0; 376 } 377 378 int hci_can_send_prepared_acl_packet_now(hci_con_handle_t con_handle) { 379 // check for async hci transport implementations 380 if (hci_stack->hci_transport->can_send_packet_now){ 381 if (!hci_stack->hci_transport->can_send_packet_now(HCI_ACL_DATA_PACKET)){ 382 return 0; 383 } 384 } 385 return hci_number_free_acl_slots_for_handle(con_handle) > 0; 386 } 387 388 int hci_can_send_acl_packet_now(hci_con_handle_t con_handle){ 389 if (hci_stack->hci_packet_buffer_reserved) return 0; 390 return hci_can_send_prepared_acl_packet_now(con_handle); 391 } 392 393 int hci_can_send_prepared_sco_packet_now(hci_con_handle_t con_handle){ 394 if (hci_stack->hci_transport->can_send_packet_now){ 395 if (!hci_stack->hci_transport->can_send_packet_now(HCI_SCO_DATA_PACKET)){ 396 return 0; 397 } 398 } 399 return hci_number_free_sco_slots_for_handle(con_handle) > 0; 400 } 401 402 int hci_can_send_sco_packet_now(hci_con_handle_t con_handle){ 403 if (hci_stack->hci_packet_buffer_reserved) return 0; 404 return hci_can_send_prepared_sco_packet_now(con_handle); 405 } 406 407 // used for internal checks in l2cap[-le].c 408 int hci_is_packet_buffer_reserved(void){ 409 return hci_stack->hci_packet_buffer_reserved; 410 } 411 412 // reserves outgoing packet buffer. @returns 1 if successful 413 int hci_reserve_packet_buffer(void){ 414 if (hci_stack->hci_packet_buffer_reserved) { 415 log_error("hci_reserve_packet_buffer called but buffer already reserved"); 416 return 0; 417 } 418 hci_stack->hci_packet_buffer_reserved = 1; 419 return 1; 420 } 421 422 void hci_release_packet_buffer(void){ 423 hci_stack->hci_packet_buffer_reserved = 0; 424 } 425 426 // assumption: synchronous implementations don't provide can_send_packet_now as they don't keep the buffer after the call 427 int hci_transport_synchronous(void){ 428 return hci_stack->hci_transport->can_send_packet_now == NULL; 429 } 430 431 uint16_t hci_max_acl_le_data_packet_length(void){ 432 return hci_stack->le_data_packets_length > 0 ? hci_stack->le_data_packets_length : hci_stack->acl_data_packet_length; 433 } 434 435 static int hci_send_acl_packet_fragments(hci_connection_t *connection){ 436 437 // log_info("hci_send_acl_packet_fragments %u/%u (con 0x%04x)", hci_stack->acl_fragmentation_pos, hci_stack->acl_fragmentation_total_size, connection->con_handle); 438 439 // max ACL data packet length depends on connection type (LE vs. Classic) and available buffers 440 uint16_t max_acl_data_packet_length = hci_stack->acl_data_packet_length; 441 if (hci_is_le_connection(connection) && hci_stack->le_data_packets_length > 0){ 442 max_acl_data_packet_length = hci_stack->le_data_packets_length; 443 } 444 445 // testing: reduce buffer to minimum 446 // max_acl_data_packet_length = 52; 447 448 int err; 449 // multiple packets could be send on a synchronous HCI transport 450 while (1){ 451 452 // get current data 453 const uint16_t acl_header_pos = hci_stack->acl_fragmentation_pos - 4; 454 int current_acl_data_packet_length = hci_stack->acl_fragmentation_total_size - hci_stack->acl_fragmentation_pos; 455 int more_fragments = 0; 456 457 // if ACL packet is larger than Bluetooth packet buffer, only send max_acl_data_packet_length 458 if (current_acl_data_packet_length > max_acl_data_packet_length){ 459 more_fragments = 1; 460 current_acl_data_packet_length = max_acl_data_packet_length; 461 } 462 463 // copy handle_and_flags if not first fragment and update packet boundary flags to be 01 (continuing fragmnent) 464 if (acl_header_pos > 0){ 465 uint16_t handle_and_flags = READ_BT_16(hci_stack->hci_packet_buffer, 0); 466 handle_and_flags = (handle_and_flags & 0xcfff) | (1 << 12); 467 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos, handle_and_flags); 468 } 469 470 // update header len 471 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos + 2, current_acl_data_packet_length); 472 473 // count packet 474 connection->num_acl_packets_sent++; 475 476 // send packet 477 uint8_t * packet = &hci_stack->hci_packet_buffer[acl_header_pos]; 478 const int size = current_acl_data_packet_length + 4; 479 hci_dump_packet(HCI_ACL_DATA_PACKET, 0, packet, size); 480 err = hci_stack->hci_transport->send_packet(HCI_ACL_DATA_PACKET, packet, size); 481 482 // done yet? 483 if (!more_fragments) break; 484 485 // update start of next fragment to send 486 hci_stack->acl_fragmentation_pos += current_acl_data_packet_length; 487 488 // can send more? 489 if (!hci_can_send_prepared_acl_packet_now(connection->con_handle)) return err; 490 } 491 492 // done 493 hci_stack->acl_fragmentation_pos = 0; 494 hci_stack->acl_fragmentation_total_size = 0; 495 496 // release buffer now for synchronous transport 497 if (hci_transport_synchronous()){ 498 hci_release_packet_buffer(); 499 } 500 501 return err; 502 } 503 504 // pre: caller has reserved the packet buffer 505 int hci_send_acl_packet_buffer(int size){ 506 507 // log_info("hci_send_acl_packet_buffer size %u", size); 508 509 if (!hci_stack->hci_packet_buffer_reserved) { 510 log_error("hci_send_acl_packet_buffer called without reserving packet buffer"); 511 return 0; 512 } 513 514 uint8_t * packet = hci_stack->hci_packet_buffer; 515 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 516 517 // check for free places on Bluetooth module 518 if (!hci_can_send_prepared_acl_packet_now(con_handle)) { 519 log_error("hci_send_acl_packet_buffer called but no free ACL buffers on controller"); 520 hci_release_packet_buffer(); 521 return BTSTACK_ACL_BUFFERS_FULL; 522 } 523 524 hci_connection_t *connection = hci_connection_for_handle( con_handle); 525 if (!connection) { 526 log_error("hci_send_acl_packet_buffer called but no connection for handle 0x%04x", con_handle); 527 hci_release_packet_buffer(); 528 return 0; 529 } 530 hci_connection_timestamp(connection); 531 532 // hci_dump_packet( HCI_ACL_DATA_PACKET, 0, packet, size); 533 534 // setup data 535 hci_stack->acl_fragmentation_total_size = size; 536 hci_stack->acl_fragmentation_pos = 4; // start of L2CAP packet 537 538 return hci_send_acl_packet_fragments(connection); 539 } 540 541 // pre: caller has reserved the packet buffer 542 int hci_send_sco_packet_buffer(int size){ 543 544 // log_info("hci_send_acl_packet_buffer size %u", size); 545 546 if (!hci_stack->hci_packet_buffer_reserved) { 547 log_error("hci_send_acl_packet_buffer called without reserving packet buffer"); 548 return 0; 549 } 550 551 uint8_t * packet = hci_stack->hci_packet_buffer; 552 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); // same for ACL and SCO 553 554 // check for free places on Bluetooth module 555 if (!hci_can_send_prepared_sco_packet_now(con_handle)) { 556 log_error("hci_send_sco_packet_buffer called but no free ACL buffers on controller"); 557 hci_release_packet_buffer(); 558 return BTSTACK_ACL_BUFFERS_FULL; 559 } 560 561 // track send packet in connection struct 562 hci_connection_t *connection = hci_connection_for_handle( con_handle); 563 if (!connection) { 564 log_error("hci_send_sco_packet_buffer called but no connection for handle 0x%04x", con_handle); 565 hci_release_packet_buffer(); 566 return 0; 567 } 568 connection->num_sco_packets_sent++; 569 570 hci_dump_packet( HCI_SCO_DATA_PACKET, 0, packet, size); 571 return hci_stack->hci_transport->send_packet(HCI_SCO_DATA_PACKET, packet, size); 572 } 573 574 static void acl_handler(uint8_t *packet, int size){ 575 576 // log_info("acl_handler: size %u", size); 577 578 // get info 579 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 580 hci_connection_t *conn = hci_connection_for_handle(con_handle); 581 uint8_t acl_flags = READ_ACL_FLAGS(packet); 582 uint16_t acl_length = READ_ACL_LENGTH(packet); 583 584 // ignore non-registered handle 585 if (!conn){ 586 log_error( "hci.c: acl_handler called with non-registered handle %u!" , con_handle); 587 return; 588 } 589 590 // assert packet is complete 591 if (acl_length + 4 != size){ 592 log_error("hci.c: acl_handler called with ACL packet of wrong size %u, expected %u => dropping packet", size, acl_length + 4); 593 return; 594 } 595 596 // update idle timestamp 597 hci_connection_timestamp(conn); 598 599 // handle different packet types 600 switch (acl_flags & 0x03) { 601 602 case 0x01: // continuation fragment 603 604 // sanity checks 605 if (conn->acl_recombination_pos == 0) { 606 log_error( "ACL Cont Fragment but no first fragment for handle 0x%02x", con_handle); 607 return; 608 } 609 if (conn->acl_recombination_pos + acl_length > 4 + HCI_ACL_BUFFER_SIZE){ 610 log_error( "ACL Cont Fragment to large: combined packet %u > buffer size %u for handle 0x%02x", 611 conn->acl_recombination_pos + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle); 612 conn->acl_recombination_pos = 0; 613 return; 614 } 615 616 // append fragment payload (header already stored) 617 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE + conn->acl_recombination_pos], &packet[4], acl_length ); 618 conn->acl_recombination_pos += acl_length; 619 620 // log_error( "ACL Cont Fragment: acl_len %u, combined_len %u, l2cap_len %u", acl_length, 621 // conn->acl_recombination_pos, conn->acl_recombination_length); 622 623 // forward complete L2CAP packet if complete. 624 if (conn->acl_recombination_pos >= conn->acl_recombination_length + 4 + 4){ // pos already incl. ACL header 625 626 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, &conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], conn->acl_recombination_pos); 627 // reset recombination buffer 628 conn->acl_recombination_length = 0; 629 conn->acl_recombination_pos = 0; 630 } 631 break; 632 633 case 0x02: { // first fragment 634 635 // sanity check 636 if (conn->acl_recombination_pos) { 637 log_error( "ACL First Fragment but data in buffer for handle 0x%02x, dropping stale fragments", con_handle); 638 conn->acl_recombination_pos = 0; 639 } 640 641 // peek into L2CAP packet! 642 uint16_t l2cap_length = READ_L2CAP_LENGTH( packet ); 643 644 // log_info( "ACL First Fragment: acl_len %u, l2cap_len %u", acl_length, l2cap_length); 645 646 // compare fragment size to L2CAP packet size 647 if (acl_length >= l2cap_length + 4){ 648 649 // forward fragment as L2CAP packet 650 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, packet, acl_length + 4); 651 652 } else { 653 654 if (acl_length > HCI_ACL_BUFFER_SIZE){ 655 log_error( "ACL First Fragment to large: fragment %u > buffer size %u for handle 0x%02x", 656 4 + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle); 657 return; 658 } 659 660 // store first fragment and tweak acl length for complete package 661 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], packet, acl_length + 4); 662 conn->acl_recombination_pos = acl_length + 4; 663 conn->acl_recombination_length = l2cap_length; 664 bt_store_16(conn->acl_recombination_buffer, HCI_INCOMING_PRE_BUFFER_SIZE + 2, l2cap_length +4); 665 } 666 break; 667 668 } 669 default: 670 log_error( "hci.c: acl_handler called with invalid packet boundary flags %u", acl_flags & 0x03); 671 return; 672 } 673 674 // execute main loop 675 hci_run(); 676 } 677 678 static void hci_shutdown_connection(hci_connection_t *conn){ 679 log_info("Connection closed: handle 0x%x, %s", conn->con_handle, bd_addr_to_str(conn->address)); 680 681 run_loop_remove_timer(&conn->timeout); 682 683 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 684 btstack_memory_hci_connection_free( conn ); 685 686 // now it's gone 687 hci_emit_nr_connections_changed(); 688 } 689 690 static const uint16_t packet_type_sizes[] = { 691 0, HCI_ACL_2DH1_SIZE, HCI_ACL_3DH1_SIZE, HCI_ACL_DM1_SIZE, 692 HCI_ACL_DH1_SIZE, 0, 0, 0, 693 HCI_ACL_2DH3_SIZE, HCI_ACL_3DH3_SIZE, HCI_ACL_DM3_SIZE, HCI_ACL_DH3_SIZE, 694 HCI_ACL_2DH5_SIZE, HCI_ACL_3DH5_SIZE, HCI_ACL_DM5_SIZE, HCI_ACL_DH5_SIZE 695 }; 696 static const uint8_t packet_type_feature_requirement_bit[] = { 697 0, // 3 slot packets 698 1, // 5 slot packets 699 25, // EDR 2 mpbs 700 26, // EDR 3 mbps 701 39, // 3 slot EDR packts 702 40, // 5 slot EDR packet 703 }; 704 static const uint16_t packet_type_feature_packet_mask[] = { 705 0x0f00, // 3 slot packets 706 0xf000, // 5 slot packets 707 0x1102, // EDR 2 mpbs 708 0x2204, // EDR 3 mbps 709 0x0300, // 3 slot EDR packts 710 0x3000, // 5 slot EDR packet 711 }; 712 713 static uint16_t hci_acl_packet_types_for_buffer_size_and_local_features(uint16_t buffer_size, uint8_t * local_supported_features){ 714 // enable packet types based on size 715 uint16_t packet_types = 0; 716 unsigned int i; 717 for (i=0;i<16;i++){ 718 if (packet_type_sizes[i] == 0) continue; 719 if (packet_type_sizes[i] <= buffer_size){ 720 packet_types |= 1 << i; 721 } 722 } 723 // disable packet types due to missing local supported features 724 for (i=0;i<sizeof(packet_type_feature_requirement_bit);i++){ 725 int bit_idx = packet_type_feature_requirement_bit[i]; 726 int feature_set = (local_supported_features[bit_idx >> 3] & (1<<(bit_idx & 7))) != 0; 727 if (feature_set) continue; 728 log_info("Features bit %02u is not set, removing packet types 0x%04x", bit_idx, packet_type_feature_packet_mask[i]); 729 packet_types &= ~packet_type_feature_packet_mask[i]; 730 } 731 // flip bits for "may not be used" 732 packet_types ^= 0x3306; 733 return packet_types; 734 } 735 736 uint16_t hci_usable_acl_packet_types(void){ 737 return hci_stack->packet_types; 738 } 739 740 uint8_t* hci_get_outgoing_packet_buffer(void){ 741 // hci packet buffer is >= acl data packet length 742 return hci_stack->hci_packet_buffer; 743 } 744 745 uint16_t hci_max_acl_data_packet_length(void){ 746 return hci_stack->acl_data_packet_length; 747 } 748 749 int hci_non_flushable_packet_boundary_flag_supported(void){ 750 // No. 54, byte 6, bit 6 751 return (hci_stack->local_supported_features[6] & (1 << 6)) != 0; 752 } 753 754 int hci_ssp_supported(void){ 755 // No. 51, byte 6, bit 3 756 return (hci_stack->local_supported_features[6] & (1 << 3)) != 0; 757 } 758 759 int hci_classic_supported(void){ 760 // No. 37, byte 4, bit 5, = No BR/EDR Support 761 return (hci_stack->local_supported_features[4] & (1 << 5)) == 0; 762 } 763 764 int hci_le_supported(void){ 765 #ifdef HAVE_BLE 766 // No. 37, byte 4, bit 6 = LE Supported (Controller) 767 return (hci_stack->local_supported_features[4] & (1 << 6)) != 0; 768 #else 769 return 0; 770 #endif 771 } 772 773 // get addr type and address used in advertisement packets 774 void hci_le_advertisement_address(uint8_t * addr_type, bd_addr_t * addr){ 775 *addr_type = hci_stack->adv_addr_type; 776 if (hci_stack->adv_addr_type){ 777 memcpy(addr, hci_stack->adv_address, 6); 778 } else { 779 memcpy(addr, hci_stack->local_bd_addr, 6); 780 } 781 } 782 783 #ifdef HAVE_BLE 784 void le_handle_advertisement_report(uint8_t *packet, int size){ 785 int offset = 3; 786 int num_reports = packet[offset]; 787 offset += 1; 788 789 int i; 790 log_info("HCI: handle adv report with num reports: %d", num_reports); 791 uint8_t event[12 + LE_ADVERTISING_DATA_SIZE]; // use upper bound to avoid var size automatic var 792 for (i=0; i<num_reports;i++){ 793 uint8_t data_length = packet[offset + 8]; 794 uint8_t event_size = 10 + data_length; 795 int pos = 0; 796 event[pos++] = GAP_LE_ADVERTISING_REPORT; 797 event[pos++] = event_size; 798 memcpy(&event[pos], &packet[offset], 1+1+6); // event type + address type + address 799 offset += 8; 800 pos += 8; 801 event[pos++] = packet[offset + 1 + data_length]; // rssi 802 event[pos++] = packet[offset++]; //data_length; 803 memcpy(&event[pos], &packet[offset], data_length); 804 pos += data_length; 805 offset += data_length + 1; // rssi 806 hci_dump_packet( HCI_EVENT_PACKET, 0, event, pos); 807 hci_stack->packet_handler(HCI_EVENT_PACKET, event, pos); 808 } 809 } 810 #endif 811 812 static void hci_initializing_event_handler(uint8_t * packet, uint16_t size){ 813 uint8_t command_completed = 0; 814 if ((hci_stack->substate % 2) == 0) return; 815 // odd: waiting for event 816 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 817 uint16_t opcode = READ_BT_16(packet,3); 818 if (opcode == hci_stack->last_cmd_opcode){ 819 command_completed = 1; 820 log_info("Command complete for expected opcode %04x -> new substate %u", opcode, hci_stack->substate >> 1); 821 } else { 822 log_info("Command complete for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 823 } 824 } 825 if (packet[0] == HCI_EVENT_COMMAND_STATUS){ 826 uint8_t status = packet[2]; 827 uint16_t opcode = READ_BT_16(packet,4); 828 if (opcode == hci_stack->last_cmd_opcode){ 829 if (status){ 830 command_completed = 1; 831 log_error("Command status error 0x%02x for expected opcode %04x -> new substate %u", status, opcode, hci_stack->substate >> 1); 832 } else { 833 log_info("Command status OK for expected opcode %04x, waiting for command complete", opcode); 834 } 835 } else { 836 log_info("Command status for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 837 } 838 } 839 840 if (!command_completed) return; 841 842 switch(hci_stack->substate >> 1){ 843 default: 844 hci_stack->substate++; 845 break; 846 } 847 } 848 849 static void hci_initializing_state_machine(){ 850 if (hci_stack->substate % 2) { 851 // odd: waiting for command completion 852 return; 853 } 854 // log_info("hci_init: substate %u", hci_stack->substate >> 1); 855 switch (hci_stack->substate >> 1){ 856 case 0: // RESET 857 hci_state_reset(); 858 859 hci_send_cmd(&hci_reset); 860 if (hci_stack->config == NULL || ((hci_uart_config_t *)hci_stack->config)->baudrate_main == 0){ 861 // skip baud change 862 hci_stack->substate = 2 << 1; 863 } 864 break; 865 case 1: // SEND BAUD CHANGE 866 hci_stack->control->baudrate_cmd(hci_stack->config, ((hci_uart_config_t *)hci_stack->config)->baudrate_main, hci_stack->hci_packet_buffer); 867 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 868 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 869 break; 870 case 2: // LOCAL BAUD CHANGE 871 log_info("Local baud rate change"); 872 hci_stack->hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack->config)->baudrate_main); 873 hci_stack->substate += 2; 874 // break missing here for fall through 875 876 case 3: // SET BD ADDR 877 if ( hci_stack->custom_bd_addr_set && hci_stack->control && hci_stack->control->set_bd_addr_cmd){ 878 log_info("Set Public BD ADDR to %s", bd_addr_to_str(hci_stack->custom_bd_addr)); 879 hci_stack->control->set_bd_addr_cmd(hci_stack->config, hci_stack->custom_bd_addr, hci_stack->hci_packet_buffer); 880 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 881 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 882 break; 883 } 884 hci_stack->substate += 2; 885 // break missing here for fall through 886 887 case 4: 888 log_info("Custom init"); 889 // Custom initialization 890 if (hci_stack->control && hci_stack->control->next_cmd){ 891 int valid_cmd = (*hci_stack->control->next_cmd)(hci_stack->config, hci_stack->hci_packet_buffer); 892 if (valid_cmd){ 893 int size = 3 + hci_stack->hci_packet_buffer[2]; 894 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 895 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, hci_stack->hci_packet_buffer, size); 896 hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack->hci_packet_buffer, size); 897 hci_stack->substate = 3 << 1; // more init commands 898 break; 899 } 900 log_info("hci_run: init script done"); 901 } 902 // otherwise continue 903 hci_send_cmd(&hci_read_bd_addr); 904 break; 905 case 5: 906 hci_send_cmd(&hci_read_buffer_size); 907 break; 908 case 6: 909 hci_send_cmd(&hci_read_local_supported_features); 910 break; 911 case 7: 912 if (hci_le_supported()){ 913 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 914 } else { 915 // Kensington Bluetooth 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 916 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 917 } 918 919 // skip Classic init commands for LE only chipsets 920 if (!hci_classic_supported()){ 921 if (hci_le_supported()){ 922 hci_stack->substate = 12 << 1; // skip all classic command 923 } else { 924 log_error("Neither BR/EDR nor LE supported"); 925 hci_stack->substate = 15 << 1; // skip all 926 } 927 } 928 break; 929 case 8: 930 if (hci_ssp_supported()){ 931 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack->ssp_enable); 932 break; 933 } 934 hci_stack->substate += 2; 935 // break missing here for fall through 936 937 case 9: 938 // ca. 15 sec 939 hci_send_cmd(&hci_write_page_timeout, 0x6000); 940 break; 941 case 10: 942 hci_send_cmd(&hci_write_class_of_device, hci_stack->class_of_device); 943 break; 944 case 11: 945 if (hci_stack->local_name){ 946 hci_send_cmd(&hci_write_local_name, hci_stack->local_name); 947 } else { 948 char hostname[30]; 949 #ifdef EMBEDDED 950 // BTstack-11:22:33:44:55:66 951 strcpy(hostname, "BTstack "); 952 strcat(hostname, bd_addr_to_str(hci_stack->local_bd_addr)); 953 log_info("---> Name %s", hostname); 954 #else 955 // hostname for POSIX systems 956 gethostname(hostname, 30); 957 hostname[29] = '\0'; 958 #endif 959 hci_send_cmd(&hci_write_local_name, hostname); 960 } 961 break; 962 case 12: 963 hci_send_cmd(&hci_write_scan_enable, (hci_stack->connectable << 1) | hci_stack->discoverable); // page scan 964 if (!hci_le_supported()){ 965 // SKIP LE init for Classic only configuration 966 hci_stack->substate = 15 << 1; 967 } 968 break; 969 970 #ifdef HAVE_BLE 971 // LE INIT 972 case 13: 973 hci_send_cmd(&hci_le_read_buffer_size); 974 break; 975 case 14: 976 // LE Supported Host = 1, Simultaneous Host = 0 977 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 978 break; 979 case 15: 980 // LE Scan Parameters: active scanning, 300 ms interval, 30 ms window, public address, accept all advs 981 hci_send_cmd(&hci_le_set_scan_parameters, 1, 0x1e0, 0x30, 0, 0); 982 break; 983 #endif 984 985 // DONE 986 case 16: 987 // done. 988 hci_stack->state = HCI_STATE_WORKING; 989 hci_emit_state(); 990 break; 991 default: 992 break; 993 } 994 hci_stack->substate++; 995 } 996 997 // avoid huge local variables 998 #ifndef EMBEDDED 999 static device_name_t device_name; 1000 #endif 1001 static void event_handler(uint8_t *packet, int size){ 1002 1003 uint16_t event_length = packet[1]; 1004 1005 // assert packet is complete 1006 if (size != event_length + 2){ 1007 log_error("hci.c: event_handler called with event packet of wrong size %u, expected %u => dropping packet", size, event_length + 2); 1008 return; 1009 } 1010 1011 bd_addr_t addr; 1012 bd_addr_type_t addr_type; 1013 uint8_t link_type; 1014 hci_con_handle_t handle; 1015 hci_connection_t * conn; 1016 int i; 1017 1018 // log_info("HCI:EVENT:%02x", packet[0]); 1019 1020 switch (packet[0]) { 1021 1022 case HCI_EVENT_COMMAND_COMPLETE: 1023 // get num cmd packets 1024 // log_info("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u", hci_stack->num_cmd_packets, packet[2]); 1025 hci_stack->num_cmd_packets = packet[2]; 1026 1027 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 1028 // from offset 5 1029 // status 1030 // "The HC_ACL_Data_Packet_Length return parameter will be used to determine the size of the L2CAP segments contained in ACL Data Packets" 1031 hci_stack->acl_data_packet_length = READ_BT_16(packet, 6); 1032 hci_stack->sco_data_packet_length = packet[8]; 1033 hci_stack->acl_packets_total_num = READ_BT_16(packet, 9); 1034 hci_stack->sco_packets_total_num = READ_BT_16(packet, 11); 1035 1036 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1037 // determine usable ACL payload size 1038 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->acl_data_packet_length){ 1039 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1040 } 1041 log_info("hci_read_buffer_size: acl used size %u, count %u / sco size %u, count %u", 1042 hci_stack->acl_data_packet_length, hci_stack->acl_packets_total_num, 1043 hci_stack->sco_data_packet_length, hci_stack->sco_packets_total_num); 1044 } 1045 } 1046 #ifdef HAVE_BLE 1047 if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_buffer_size)){ 1048 hci_stack->le_data_packets_length = READ_BT_16(packet, 6); 1049 hci_stack->le_acl_packets_total_num = packet[8]; 1050 // determine usable ACL payload size 1051 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->le_data_packets_length){ 1052 hci_stack->le_data_packets_length = HCI_ACL_PAYLOAD_SIZE; 1053 } 1054 log_info("hci_le_read_buffer_size: size %u, count %u", hci_stack->le_data_packets_length, hci_stack->le_acl_packets_total_num); 1055 } 1056 #endif 1057 // Dump local address 1058 if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)) { 1059 bt_flip_addr(hci_stack->local_bd_addr, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1]); 1060 log_info("Local Address, Status: 0x%02x: Addr: %s", 1061 packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE], bd_addr_to_str(hci_stack->local_bd_addr)); 1062 } 1063 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1064 hci_emit_discoverable_enabled(hci_stack->discoverable); 1065 } 1066 // Note: HCI init checks 1067 if (COMMAND_COMPLETE_EVENT(packet, hci_read_local_supported_features)){ 1068 memcpy(hci_stack->local_supported_features, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1], 8); 1069 log_info("Local Supported Features: 0x%02x%02x%02x%02x%02x%02x%02x%02x", 1070 hci_stack->local_supported_features[0], hci_stack->local_supported_features[1], 1071 hci_stack->local_supported_features[2], hci_stack->local_supported_features[3], 1072 hci_stack->local_supported_features[4], hci_stack->local_supported_features[5], 1073 hci_stack->local_supported_features[6], hci_stack->local_supported_features[7]); 1074 1075 // determine usable ACL packet types based on host buffer size and supported features 1076 hci_stack->packet_types = hci_acl_packet_types_for_buffer_size_and_local_features(HCI_ACL_PAYLOAD_SIZE, &hci_stack->local_supported_features[0]); 1077 log_info("packet types %04x", hci_stack->packet_types); 1078 1079 // Classic/LE 1080 log_info("BR/EDR support %u, LE support %u", hci_classic_supported(), hci_le_supported()); 1081 } 1082 break; 1083 1084 case HCI_EVENT_COMMAND_STATUS: 1085 // get num cmd packets 1086 // log_info("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u", hci_stack->num_cmd_packets, packet[3]); 1087 hci_stack->num_cmd_packets = packet[3]; 1088 break; 1089 1090 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:{ 1091 int offset = 3; 1092 for (i=0; i<packet[2];i++){ 1093 handle = READ_BT_16(packet, offset); 1094 offset += 2; 1095 uint16_t num_packets = READ_BT_16(packet, offset); 1096 offset += 2; 1097 1098 conn = hci_connection_for_handle(handle); 1099 if (!conn){ 1100 log_error("hci_number_completed_packet lists unused con handle %u", handle); 1101 continue; 1102 } 1103 1104 if (conn->address_type == BD_ADDR_TYPE_SCO){ 1105 if (conn->num_sco_packets_sent >= num_packets){ 1106 conn->num_sco_packets_sent -= num_packets; 1107 } else { 1108 log_error("hci_number_completed_packets, more sco slots freed then sent."); 1109 conn->num_sco_packets_sent = 0; 1110 } 1111 1112 } else { 1113 if (conn->num_acl_packets_sent >= num_packets){ 1114 conn->num_acl_packets_sent -= num_packets; 1115 } else { 1116 log_error("hci_number_completed_packets, more acl slots freed then sent."); 1117 conn->num_acl_packets_sent = 0; 1118 } 1119 } 1120 // log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u", num_packets, handle, conn->num_acl_packets_sent); 1121 } 1122 break; 1123 } 1124 case HCI_EVENT_CONNECTION_REQUEST: 1125 bt_flip_addr(addr, &packet[2]); 1126 // TODO: eval COD 8-10 1127 link_type = packet[11]; 1128 log_info("Connection_incoming: %s, type %u", bd_addr_to_str(addr), link_type); 1129 addr_type = link_type == 1 ? BD_ADDR_TYPE_CLASSIC : BD_ADDR_TYPE_SCO; 1130 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1131 if (!conn) { 1132 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 1133 } 1134 if (!conn) { 1135 // CONNECTION REJECTED DUE TO LIMITED RESOURCES (0X0D) 1136 hci_stack->decline_reason = 0x0d; 1137 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1138 break; 1139 } 1140 conn->state = RECEIVED_CONNECTION_REQUEST; 1141 hci_run(); 1142 break; 1143 1144 case HCI_EVENT_CONNECTION_COMPLETE: 1145 // Connection management 1146 bt_flip_addr(addr, &packet[5]); 1147 log_info("Connection_complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 1148 addr_type = BD_ADDR_TYPE_CLASSIC; 1149 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1150 if (conn) { 1151 if (!packet[2]){ 1152 conn->state = OPEN; 1153 conn->con_handle = READ_BT_16(packet, 3); 1154 conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES; 1155 1156 // restart timer 1157 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1158 run_loop_add_timer(&conn->timeout); 1159 1160 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1161 1162 hci_emit_nr_connections_changed(); 1163 } else { 1164 int notify_dedicated_bonding_failed = conn->bonding_flags & BONDING_DEDICATED; 1165 uint8_t status = packet[2]; 1166 bd_addr_t bd_address; 1167 memcpy(&bd_address, conn->address, 6); 1168 1169 // connection failed, remove entry 1170 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1171 btstack_memory_hci_connection_free( conn ); 1172 1173 // notify client if dedicated bonding 1174 if (notify_dedicated_bonding_failed){ 1175 log_info("hci notify_dedicated_bonding_failed"); 1176 hci_emit_dedicated_bonding_result(bd_address, status); 1177 } 1178 1179 // if authentication error, also delete link key 1180 if (packet[2] == 0x05) { 1181 hci_drop_link_key_for_bd_addr(&addr); 1182 } 1183 } 1184 } 1185 break; 1186 1187 case HCI_EVENT_SYNCHRONOUS_CONNECTION_COMPLETE: 1188 bt_flip_addr(addr, &packet[5]); 1189 log_info("Synchronous Connection Complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 1190 if (packet[2]){ 1191 // connection failed 1192 break; 1193 } 1194 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_SCO); 1195 if (!conn) { 1196 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_SCO); 1197 } 1198 if (!conn) { 1199 break; 1200 } 1201 conn->state = OPEN; 1202 conn->con_handle = READ_BT_16(packet, 3); 1203 break; 1204 1205 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 1206 handle = READ_BT_16(packet, 3); 1207 conn = hci_connection_for_handle(handle); 1208 if (!conn) break; 1209 if (!packet[2]){ 1210 uint8_t * features = &packet[5]; 1211 if (features[6] & (1 << 3)){ 1212 conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP; 1213 } 1214 } 1215 conn->bonding_flags |= BONDING_RECEIVED_REMOTE_FEATURES; 1216 log_info("HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE, bonding flags %x", conn->bonding_flags); 1217 if (conn->bonding_flags & BONDING_DEDICATED){ 1218 conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 1219 } 1220 break; 1221 1222 case HCI_EVENT_LINK_KEY_REQUEST: 1223 log_info("HCI_EVENT_LINK_KEY_REQUEST"); 1224 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 1225 // non-bondable mode: link key negative reply will be sent by HANDLE_LINK_KEY_REQUEST 1226 if (hci_stack->bondable && !hci_stack->remote_device_db) break; 1227 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], HANDLE_LINK_KEY_REQUEST); 1228 hci_run(); 1229 // request handled by hci_run() as HANDLE_LINK_KEY_REQUEST gets set 1230 return; 1231 1232 case HCI_EVENT_LINK_KEY_NOTIFICATION: { 1233 bt_flip_addr(addr, &packet[2]); 1234 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1235 if (!conn) break; 1236 conn->authentication_flags |= RECV_LINK_KEY_NOTIFICATION; 1237 link_key_type_t link_key_type = (link_key_type_t)packet[24]; 1238 // Change Connection Encryption keeps link key type 1239 if (link_key_type != CHANGED_COMBINATION_KEY){ 1240 conn->link_key_type = link_key_type; 1241 } 1242 if (!hci_stack->remote_device_db) break; 1243 hci_stack->remote_device_db->put_link_key(&addr, (link_key_t *) &packet[8], conn->link_key_type); 1244 // still forward event to allow dismiss of pairing dialog 1245 break; 1246 } 1247 1248 case HCI_EVENT_PIN_CODE_REQUEST: 1249 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], LEGACY_PAIRING_ACTIVE); 1250 // non-bondable mode: pin code negative reply will be sent 1251 if (!hci_stack->bondable){ 1252 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], DENY_PIN_CODE_REQUEST); 1253 hci_run(); 1254 return; 1255 } 1256 // PIN CODE REQUEST means the link key request didn't succee -> delete stored link key 1257 if (!hci_stack->remote_device_db) break; 1258 bt_flip_addr(addr, &packet[2]); 1259 hci_stack->remote_device_db->delete_link_key(&addr); 1260 break; 1261 1262 case HCI_EVENT_IO_CAPABILITY_REQUEST: 1263 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_IO_CAPABILITIES_REQUEST); 1264 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_IO_CAPABILITIES_REPLY); 1265 break; 1266 1267 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 1268 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1269 if (!hci_stack->ssp_auto_accept) break; 1270 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_CONFIRM_REPLY); 1271 break; 1272 1273 case HCI_EVENT_USER_PASSKEY_REQUEST: 1274 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1275 if (!hci_stack->ssp_auto_accept) break; 1276 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_PASSKEY_REPLY); 1277 break; 1278 1279 case HCI_EVENT_ENCRYPTION_CHANGE: 1280 handle = READ_BT_16(packet, 3); 1281 conn = hci_connection_for_handle(handle); 1282 if (!conn) break; 1283 if (packet[2] == 0) { 1284 if (packet[5]){ 1285 conn->authentication_flags |= CONNECTION_ENCRYPTED; 1286 } else { 1287 conn->authentication_flags &= ~CONNECTION_ENCRYPTED; 1288 } 1289 } 1290 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1291 break; 1292 1293 case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT: 1294 handle = READ_BT_16(packet, 3); 1295 conn = hci_connection_for_handle(handle); 1296 if (!conn) break; 1297 1298 // dedicated bonding: send result and disconnect 1299 if (conn->bonding_flags & BONDING_DEDICATED){ 1300 conn->bonding_flags &= ~BONDING_DEDICATED; 1301 conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE; 1302 conn->bonding_status = packet[2]; 1303 break; 1304 } 1305 1306 if (packet[2] == 0 && gap_security_level_for_link_key_type(conn->link_key_type) >= conn->requested_security_level){ 1307 // link key sufficient for requested security 1308 conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 1309 break; 1310 } 1311 // not enough 1312 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1313 break; 1314 1315 #ifndef EMBEDDED 1316 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 1317 if (!hci_stack->remote_device_db) break; 1318 if (packet[2]) break; // status not ok 1319 bt_flip_addr(addr, &packet[3]); 1320 // fix for invalid remote names - terminate on 0xff 1321 for (i=0; i<248;i++){ 1322 if (packet[9+i] == 0xff){ 1323 packet[9+i] = 0; 1324 break; 1325 } 1326 } 1327 memset(&device_name, 0, sizeof(device_name_t)); 1328 strncpy((char*) device_name, (char*) &packet[9], 248); 1329 hci_stack->remote_device_db->put_name(&addr, &device_name); 1330 break; 1331 1332 case HCI_EVENT_INQUIRY_RESULT: 1333 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:{ 1334 if (!hci_stack->remote_device_db) break; 1335 // first send inq result packet 1336 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1337 // then send cached remote names 1338 int offset = 3; 1339 for (i=0; i<packet[2];i++){ 1340 bt_flip_addr(addr, &packet[offset]); 1341 offset += 14; // 6 + 1 + 1 + 1 + 3 + 2; 1342 if (hci_stack->remote_device_db->get_name(&addr, &device_name)){ 1343 hci_emit_remote_name_cached(&addr, &device_name); 1344 } 1345 } 1346 return; 1347 } 1348 #endif 1349 1350 // HCI_EVENT_DISCONNECTION_COMPLETE 1351 // has been split, to first notify stack before shutting connection down 1352 // see end of function, too. 1353 case HCI_EVENT_DISCONNECTION_COMPLETE: 1354 if (packet[2]) break; // status != 0 1355 handle = READ_BT_16(packet, 3); 1356 hci_connection_t * conn = hci_connection_for_handle(handle); 1357 if (!conn) break; // no conn struct anymore 1358 conn->state = RECEIVED_DISCONNECTION_COMPLETE; 1359 break; 1360 1361 case HCI_EVENT_HARDWARE_ERROR: 1362 if(hci_stack->control && hci_stack->control->hw_error){ 1363 (*hci_stack->control->hw_error)(); 1364 } else { 1365 // if no special requests, just reboot stack 1366 hci_power_control_off(); 1367 hci_power_control_on(); 1368 } 1369 break; 1370 1371 case DAEMON_EVENT_HCI_PACKET_SENT: 1372 // release packet buffer only for asynchronous transport and if there are not further fragements 1373 if (hci_transport_synchronous()) { 1374 log_error("Synchronous HCI Transport shouldn't send DAEMON_EVENT_HCI_PACKET_SENT"); 1375 return; // instead of break: to avoid re-entering hci_run() 1376 } 1377 if (hci_stack->acl_fragmentation_total_size) break; 1378 hci_release_packet_buffer(); 1379 break; 1380 1381 #ifdef HAVE_BLE 1382 case HCI_EVENT_LE_META: 1383 switch (packet[2]){ 1384 case HCI_SUBEVENT_LE_ADVERTISING_REPORT: 1385 log_info("advertising report received"); 1386 if (hci_stack->le_scanning_state != LE_SCANNING) break; 1387 le_handle_advertisement_report(packet, size); 1388 break; 1389 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 1390 // Connection management 1391 bt_flip_addr(addr, &packet[8]); 1392 addr_type = (bd_addr_type_t)packet[7]; 1393 log_info("LE Connection_complete (status=%u) type %u, %s", packet[3], addr_type, bd_addr_to_str(addr)); 1394 // LE connections are auto-accepted, so just create a connection if there isn't one already 1395 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1396 if (packet[3]){ 1397 if (conn){ 1398 // outgoing connection failed, remove entry 1399 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1400 btstack_memory_hci_connection_free( conn ); 1401 } 1402 // if authentication error, also delete link key 1403 if (packet[3] == 0x05) { 1404 hci_drop_link_key_for_bd_addr(&addr); 1405 } 1406 break; 1407 } 1408 if (!conn){ 1409 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 1410 } 1411 if (!conn){ 1412 // no memory 1413 break; 1414 } 1415 1416 conn->state = OPEN; 1417 conn->con_handle = READ_BT_16(packet, 4); 1418 1419 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 1420 1421 // restart timer 1422 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1423 // run_loop_add_timer(&conn->timeout); 1424 1425 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1426 1427 hci_emit_nr_connections_changed(); 1428 break; 1429 1430 // log_info("LE buffer size: %u, count %u", READ_BT_16(packet,6), packet[8]); 1431 1432 default: 1433 break; 1434 } 1435 break; 1436 #endif 1437 default: 1438 break; 1439 } 1440 1441 // handle BT initialization 1442 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1443 hci_initializing_event_handler(packet, size); 1444 } 1445 1446 // help with BT sleep 1447 if (hci_stack->state == HCI_STATE_FALLING_ASLEEP 1448 && hci_stack->substate == 1 1449 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1450 hci_stack->substate++; 1451 } 1452 1453 // notify upper stack 1454 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1455 1456 // moved here to give upper stack a chance to close down everything with hci_connection_t intact 1457 if (packet[0] == HCI_EVENT_DISCONNECTION_COMPLETE){ 1458 if (!packet[2]){ 1459 handle = READ_BT_16(packet, 3); 1460 hci_connection_t * conn = hci_connection_for_handle(handle); 1461 if (conn) { 1462 uint8_t status = conn->bonding_status; 1463 uint16_t flags = conn->bonding_flags; 1464 bd_addr_t bd_address; 1465 memcpy(&bd_address, conn->address, 6); 1466 hci_shutdown_connection(conn); 1467 // connection struct is gone, don't access anymore 1468 if (flags & BONDING_EMIT_COMPLETE_ON_DISCONNECT){ 1469 hci_emit_dedicated_bonding_result(bd_address, status); 1470 } 1471 } 1472 } 1473 } 1474 1475 // execute main loop 1476 hci_run(); 1477 } 1478 1479 static void sco_handler(uint8_t * packet, uint16_t size){ 1480 // not handled yet 1481 } 1482 1483 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1484 hci_dump_packet(packet_type, 1, packet, size); 1485 switch (packet_type) { 1486 case HCI_EVENT_PACKET: 1487 event_handler(packet, size); 1488 break; 1489 case HCI_ACL_DATA_PACKET: 1490 acl_handler(packet, size); 1491 break; 1492 case HCI_SCO_DATA_PACKET: 1493 sco_handler(packet, size); 1494 default: 1495 break; 1496 } 1497 } 1498 1499 /** Register HCI packet handlers */ 1500 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 1501 hci_stack->packet_handler = handler; 1502 } 1503 1504 static void hci_state_reset(){ 1505 // no connections yet 1506 hci_stack->connections = NULL; 1507 1508 // keep discoverable/connectable as this has been requested by the client(s) 1509 // hci_stack->discoverable = 0; 1510 // hci_stack->connectable = 0; 1511 // hci_stack->bondable = 1; 1512 1513 // buffer is free 1514 hci_stack->hci_packet_buffer_reserved = 0; 1515 1516 // no pending cmds 1517 hci_stack->decline_reason = 0; 1518 hci_stack->new_scan_enable_value = 0xff; 1519 1520 // LE 1521 hci_stack->adv_addr_type = 0; 1522 memset(hci_stack->adv_address, 0, 6); 1523 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1524 hci_stack->le_scan_type = 0xff; 1525 hci_stack->le_connection_parameter_range.le_conn_interval_min = 0x0006; 1526 hci_stack->le_connection_parameter_range.le_conn_interval_max = 0x0C80; 1527 hci_stack->le_connection_parameter_range.le_conn_latency_min = 0x0000; 1528 hci_stack->le_connection_parameter_range.le_conn_latency_max = 0x03E8; 1529 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = 0x000A; 1530 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = 0x0C80; 1531 } 1532 1533 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 1534 1535 #ifdef HAVE_MALLOC 1536 if (!hci_stack) { 1537 hci_stack = (hci_stack_t*) malloc(sizeof(hci_stack_t)); 1538 } 1539 #else 1540 hci_stack = &hci_stack_static; 1541 #endif 1542 memset(hci_stack, 0, sizeof(hci_stack_t)); 1543 1544 // reference to use transport layer implementation 1545 hci_stack->hci_transport = transport; 1546 1547 // references to used control implementation 1548 hci_stack->control = control; 1549 1550 // reference to used config 1551 hci_stack->config = config; 1552 1553 // higher level handler 1554 hci_stack->packet_handler = dummy_handler; 1555 1556 // store and open remote device db 1557 hci_stack->remote_device_db = remote_device_db; 1558 if (hci_stack->remote_device_db) { 1559 hci_stack->remote_device_db->open(); 1560 } 1561 1562 // max acl payload size defined in config.h 1563 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1564 1565 // register packet handlers with transport 1566 transport->register_packet_handler(&packet_handler); 1567 1568 hci_stack->state = HCI_STATE_OFF; 1569 1570 // class of device 1571 hci_stack->class_of_device = 0x007a020c; // Smartphone 1572 1573 // bondable by default 1574 hci_stack->bondable = 1; 1575 1576 // Secure Simple Pairing default: enable, no I/O capabilities, general bonding, mitm not required, auto accept 1577 hci_stack->ssp_enable = 1; 1578 hci_stack->ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 1579 hci_stack->ssp_authentication_requirement = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING; 1580 hci_stack->ssp_auto_accept = 1; 1581 1582 hci_state_reset(); 1583 } 1584 1585 void hci_close(){ 1586 // close remote device db 1587 if (hci_stack->remote_device_db) { 1588 hci_stack->remote_device_db->close(); 1589 } 1590 while (hci_stack->connections) { 1591 // cancel all l2cap connections 1592 hci_emit_disconnection_complete(((hci_connection_t *) hci_stack->connections)->con_handle, 0x16); // terminated by local host 1593 hci_shutdown_connection((hci_connection_t *) hci_stack->connections); 1594 } 1595 hci_power_control(HCI_POWER_OFF); 1596 1597 #ifdef HAVE_MALLOC 1598 free(hci_stack); 1599 #endif 1600 hci_stack = NULL; 1601 } 1602 1603 void hci_set_class_of_device(uint32_t class_of_device){ 1604 hci_stack->class_of_device = class_of_device; 1605 } 1606 1607 // Set Public BD ADDR - passed on to Bluetooth chipset if supported in bt_control_h 1608 void hci_set_bd_addr(bd_addr_t addr){ 1609 memcpy(hci_stack->custom_bd_addr, addr, 6); 1610 hci_stack->custom_bd_addr_set = 1; 1611 } 1612 1613 void hci_disable_l2cap_timeout_check(){ 1614 disable_l2cap_timeouts = 1; 1615 } 1616 // State-Module-Driver overview 1617 // state module low-level 1618 // HCI_STATE_OFF off close 1619 // HCI_STATE_INITIALIZING, on open 1620 // HCI_STATE_WORKING, on open 1621 // HCI_STATE_HALTING, on open 1622 // HCI_STATE_SLEEPING, off/sleep close 1623 // HCI_STATE_FALLING_ASLEEP on open 1624 1625 static int hci_power_control_on(void){ 1626 1627 // power on 1628 int err = 0; 1629 if (hci_stack->control && hci_stack->control->on){ 1630 err = (*hci_stack->control->on)(hci_stack->config); 1631 } 1632 if (err){ 1633 log_error( "POWER_ON failed"); 1634 hci_emit_hci_open_failed(); 1635 return err; 1636 } 1637 1638 // open low-level device 1639 err = hci_stack->hci_transport->open(hci_stack->config); 1640 if (err){ 1641 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1642 if (hci_stack->control && hci_stack->control->off){ 1643 (*hci_stack->control->off)(hci_stack->config); 1644 } 1645 hci_emit_hci_open_failed(); 1646 return err; 1647 } 1648 return 0; 1649 } 1650 1651 static void hci_power_control_off(void){ 1652 1653 log_info("hci_power_control_off"); 1654 1655 // close low-level device 1656 hci_stack->hci_transport->close(hci_stack->config); 1657 1658 log_info("hci_power_control_off - hci_transport closed"); 1659 1660 // power off 1661 if (hci_stack->control && hci_stack->control->off){ 1662 (*hci_stack->control->off)(hci_stack->config); 1663 } 1664 1665 log_info("hci_power_control_off - control closed"); 1666 1667 hci_stack->state = HCI_STATE_OFF; 1668 } 1669 1670 static void hci_power_control_sleep(void){ 1671 1672 log_info("hci_power_control_sleep"); 1673 1674 #if 0 1675 // don't close serial port during sleep 1676 1677 // close low-level device 1678 hci_stack->hci_transport->close(hci_stack->config); 1679 #endif 1680 1681 // sleep mode 1682 if (hci_stack->control && hci_stack->control->sleep){ 1683 (*hci_stack->control->sleep)(hci_stack->config); 1684 } 1685 1686 hci_stack->state = HCI_STATE_SLEEPING; 1687 } 1688 1689 static int hci_power_control_wake(void){ 1690 1691 log_info("hci_power_control_wake"); 1692 1693 // wake on 1694 if (hci_stack->control && hci_stack->control->wake){ 1695 (*hci_stack->control->wake)(hci_stack->config); 1696 } 1697 1698 #if 0 1699 // open low-level device 1700 int err = hci_stack->hci_transport->open(hci_stack->config); 1701 if (err){ 1702 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1703 if (hci_stack->control && hci_stack->control->off){ 1704 (*hci_stack->control->off)(hci_stack->config); 1705 } 1706 hci_emit_hci_open_failed(); 1707 return err; 1708 } 1709 #endif 1710 1711 return 0; 1712 } 1713 1714 static void hci_power_transition_to_initializing(void){ 1715 // set up state machine 1716 hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent 1717 hci_stack->hci_packet_buffer_reserved = 0; 1718 hci_stack->state = HCI_STATE_INITIALIZING; 1719 hci_stack->substate = 0; 1720 } 1721 1722 int hci_power_control(HCI_POWER_MODE power_mode){ 1723 1724 log_info("hci_power_control: %u, current mode %u", power_mode, hci_stack->state); 1725 1726 int err = 0; 1727 switch (hci_stack->state){ 1728 1729 case HCI_STATE_OFF: 1730 switch (power_mode){ 1731 case HCI_POWER_ON: 1732 err = hci_power_control_on(); 1733 if (err) { 1734 log_error("hci_power_control_on() error %u", err); 1735 return err; 1736 } 1737 hci_power_transition_to_initializing(); 1738 break; 1739 case HCI_POWER_OFF: 1740 // do nothing 1741 break; 1742 case HCI_POWER_SLEEP: 1743 // do nothing (with SLEEP == OFF) 1744 break; 1745 } 1746 break; 1747 1748 case HCI_STATE_INITIALIZING: 1749 switch (power_mode){ 1750 case HCI_POWER_ON: 1751 // do nothing 1752 break; 1753 case HCI_POWER_OFF: 1754 // no connections yet, just turn it off 1755 hci_power_control_off(); 1756 break; 1757 case HCI_POWER_SLEEP: 1758 // no connections yet, just turn it off 1759 hci_power_control_sleep(); 1760 break; 1761 } 1762 break; 1763 1764 case HCI_STATE_WORKING: 1765 switch (power_mode){ 1766 case HCI_POWER_ON: 1767 // do nothing 1768 break; 1769 case HCI_POWER_OFF: 1770 // see hci_run 1771 hci_stack->state = HCI_STATE_HALTING; 1772 break; 1773 case HCI_POWER_SLEEP: 1774 // see hci_run 1775 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1776 hci_stack->substate = 0; 1777 break; 1778 } 1779 break; 1780 1781 case HCI_STATE_HALTING: 1782 switch (power_mode){ 1783 case HCI_POWER_ON: 1784 hci_power_transition_to_initializing(); 1785 break; 1786 case HCI_POWER_OFF: 1787 // do nothing 1788 break; 1789 case HCI_POWER_SLEEP: 1790 // see hci_run 1791 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1792 hci_stack->substate = 0; 1793 break; 1794 } 1795 break; 1796 1797 case HCI_STATE_FALLING_ASLEEP: 1798 switch (power_mode){ 1799 case HCI_POWER_ON: 1800 1801 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1802 // nothing to do, if H4 supports power management 1803 if (bt_control_iphone_power_management_enabled()){ 1804 hci_stack->state = HCI_STATE_INITIALIZING; 1805 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1806 break; 1807 } 1808 #endif 1809 hci_power_transition_to_initializing(); 1810 break; 1811 case HCI_POWER_OFF: 1812 // see hci_run 1813 hci_stack->state = HCI_STATE_HALTING; 1814 break; 1815 case HCI_POWER_SLEEP: 1816 // do nothing 1817 break; 1818 } 1819 break; 1820 1821 case HCI_STATE_SLEEPING: 1822 switch (power_mode){ 1823 case HCI_POWER_ON: 1824 1825 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1826 // nothing to do, if H4 supports power management 1827 if (bt_control_iphone_power_management_enabled()){ 1828 hci_stack->state = HCI_STATE_INITIALIZING; 1829 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1830 hci_update_scan_enable(); 1831 break; 1832 } 1833 #endif 1834 err = hci_power_control_wake(); 1835 if (err) return err; 1836 hci_power_transition_to_initializing(); 1837 break; 1838 case HCI_POWER_OFF: 1839 hci_stack->state = HCI_STATE_HALTING; 1840 break; 1841 case HCI_POWER_SLEEP: 1842 // do nothing 1843 break; 1844 } 1845 break; 1846 } 1847 1848 // create internal event 1849 hci_emit_state(); 1850 1851 // trigger next/first action 1852 hci_run(); 1853 1854 return 0; 1855 } 1856 1857 static void hci_update_scan_enable(void){ 1858 // 2 = page scan, 1 = inq scan 1859 hci_stack->new_scan_enable_value = hci_stack->connectable << 1 | hci_stack->discoverable; 1860 hci_run(); 1861 } 1862 1863 void hci_discoverable_control(uint8_t enable){ 1864 if (enable) enable = 1; // normalize argument 1865 1866 if (hci_stack->discoverable == enable){ 1867 hci_emit_discoverable_enabled(hci_stack->discoverable); 1868 return; 1869 } 1870 1871 hci_stack->discoverable = enable; 1872 hci_update_scan_enable(); 1873 } 1874 1875 void hci_connectable_control(uint8_t enable){ 1876 if (enable) enable = 1; // normalize argument 1877 1878 // don't emit event 1879 if (hci_stack->connectable == enable) return; 1880 1881 hci_stack->connectable = enable; 1882 hci_update_scan_enable(); 1883 } 1884 1885 bd_addr_t * hci_local_bd_addr(void){ 1886 return &hci_stack->local_bd_addr; 1887 } 1888 1889 void hci_run(){ 1890 1891 hci_connection_t * connection; 1892 linked_item_t * it; 1893 1894 // send continuation fragments first, as they block the prepared packet buffer 1895 if (hci_stack->acl_fragmentation_total_size > 0) { 1896 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(hci_stack->hci_packet_buffer); 1897 if (hci_can_send_prepared_acl_packet_now(con_handle)){ 1898 hci_connection_t *connection = hci_connection_for_handle(con_handle); 1899 if (connection) { 1900 hci_send_acl_packet_fragments(connection); 1901 return; 1902 } 1903 // connection gone -> discard further fragments 1904 hci_stack->acl_fragmentation_total_size = 0; 1905 hci_stack->acl_fragmentation_pos = 0; 1906 } 1907 } 1908 1909 if (!hci_can_send_command_packet_now()) return; 1910 1911 // global/non-connection oriented commands 1912 1913 // decline incoming connections 1914 if (hci_stack->decline_reason){ 1915 uint8_t reason = hci_stack->decline_reason; 1916 hci_stack->decline_reason = 0; 1917 hci_send_cmd(&hci_reject_connection_request, hci_stack->decline_addr, reason); 1918 return; 1919 } 1920 1921 // send scan enable 1922 if (hci_stack->state == HCI_STATE_WORKING && hci_stack->new_scan_enable_value != 0xff && hci_classic_supported()){ 1923 hci_send_cmd(&hci_write_scan_enable, hci_stack->new_scan_enable_value); 1924 hci_stack->new_scan_enable_value = 0xff; 1925 return; 1926 } 1927 1928 #ifdef HAVE_BLE 1929 // handle le scan 1930 if (hci_stack->state == HCI_STATE_WORKING){ 1931 switch(hci_stack->le_scanning_state){ 1932 case LE_START_SCAN: 1933 hci_stack->le_scanning_state = LE_SCANNING; 1934 hci_send_cmd(&hci_le_set_scan_enable, 1, 0); 1935 return; 1936 1937 case LE_STOP_SCAN: 1938 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1939 hci_send_cmd(&hci_le_set_scan_enable, 0, 0); 1940 return; 1941 default: 1942 break; 1943 } 1944 if (hci_stack->le_scan_type != 0xff){ 1945 // defaults: active scanning, accept all advertisement packets 1946 int scan_type = hci_stack->le_scan_type; 1947 hci_stack->le_scan_type = 0xff; 1948 hci_send_cmd(&hci_le_set_scan_parameters, scan_type, hci_stack->le_scan_interval, hci_stack->le_scan_window, hci_stack->adv_addr_type, 0); 1949 return; 1950 } 1951 } 1952 #endif 1953 1954 // send pending HCI commands 1955 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 1956 connection = (hci_connection_t *) it; 1957 1958 switch(connection->state){ 1959 case SEND_CREATE_CONNECTION: 1960 switch(connection->address_type){ 1961 case BD_ADDR_TYPE_CLASSIC: 1962 log_info("sending hci_create_connection"); 1963 hci_send_cmd(&hci_create_connection, connection->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 1964 break; 1965 default: 1966 #ifdef HAVE_BLE 1967 log_info("sending hci_le_create_connection"); 1968 hci_send_cmd(&hci_le_create_connection, 1969 0x0060, // scan interval: 60 ms 1970 0x0030, // scan interval: 30 ms 1971 0, // don't use whitelist 1972 connection->address_type, // peer address type 1973 connection->address, // peer bd addr 1974 hci_stack->adv_addr_type, // our addr type: 1975 0x0008, // conn interval min 1976 0x0018, // conn interval max 1977 0, // conn latency 1978 0x0048, // supervision timeout 1979 0x0001, // min ce length 1980 0x0001 // max ce length 1981 ); 1982 1983 connection->state = SENT_CREATE_CONNECTION; 1984 #endif 1985 break; 1986 } 1987 return; 1988 1989 case RECEIVED_CONNECTION_REQUEST: 1990 log_info("sending hci_accept_connection_request"); 1991 connection->state = ACCEPTED_CONNECTION_REQUEST; 1992 if (connection->address_type == BD_ADDR_TYPE_CLASSIC){ 1993 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 1994 } else { 1995 // TODO: allows to customize synchronous connection parameters 1996 hci_send_cmd(&hci_accept_synchronous_connection_command, connection->address, 8000, 8000, 0xFFFF, 0x0060, 0xFF, 0x003F); 1997 } 1998 return; 1999 2000 #ifdef HAVE_BLE 2001 case SEND_CANCEL_CONNECTION: 2002 connection->state = SENT_CANCEL_CONNECTION; 2003 hci_send_cmd(&hci_le_create_connection_cancel); 2004 return; 2005 #endif 2006 case SEND_DISCONNECT: 2007 connection->state = SENT_DISCONNECT; 2008 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2009 return; 2010 2011 default: 2012 break; 2013 } 2014 2015 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 2016 log_info("responding to link key request"); 2017 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 2018 link_key_t link_key; 2019 link_key_type_t link_key_type; 2020 if ( hci_stack->remote_device_db 2021 && hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type) 2022 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 2023 connection->link_key_type = link_key_type; 2024 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 2025 } else { 2026 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 2027 } 2028 return; 2029 } 2030 2031 if (connection->authentication_flags & DENY_PIN_CODE_REQUEST){ 2032 log_info("denying to pin request"); 2033 connectionClearAuthenticationFlags(connection, DENY_PIN_CODE_REQUEST); 2034 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 2035 return; 2036 } 2037 2038 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 2039 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 2040 log_info("IO Capability Request received, stack bondable %u, io cap %u", hci_stack->bondable, hci_stack->ssp_io_capability); 2041 if (hci_stack->bondable && (hci_stack->ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN)){ 2042 // tweak authentication requirements 2043 uint8_t authreq = hci_stack->ssp_authentication_requirement; 2044 if (connection->bonding_flags & BONDING_DEDICATED){ 2045 authreq = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING; 2046 } 2047 if (gap_mitm_protection_required_for_security_level(connection->requested_security_level)){ 2048 authreq |= 1; 2049 } 2050 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack->ssp_io_capability, NULL, authreq); 2051 } else { 2052 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 2053 } 2054 return; 2055 } 2056 2057 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 2058 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 2059 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 2060 return; 2061 } 2062 2063 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 2064 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 2065 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 2066 return; 2067 } 2068 2069 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 2070 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 2071 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 2072 return; 2073 } 2074 2075 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 2076 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 2077 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 2078 return; 2079 } 2080 if (connection->bonding_flags & BONDING_DISCONNECT_DEDICATED_DONE){ 2081 connection->bonding_flags &= ~BONDING_DISCONNECT_DEDICATED_DONE; 2082 connection->bonding_flags |= BONDING_EMIT_COMPLETE_ON_DISCONNECT; 2083 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // authentication done 2084 return; 2085 } 2086 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 2087 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 2088 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 2089 return; 2090 } 2091 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 2092 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 2093 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 2094 return; 2095 } 2096 2097 #ifdef HAVE_BLE 2098 if (connection->le_con_parameter_update_state == CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS){ 2099 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 2100 2101 uint16_t connection_interval_min = connection->le_conn_interval_min; 2102 connection->le_conn_interval_min = 0; 2103 hci_send_cmd(&hci_le_connection_update, connection->con_handle, connection_interval_min, 2104 connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout, 2105 0x0000, 0xffff); 2106 } 2107 #endif 2108 } 2109 2110 switch (hci_stack->state){ 2111 case HCI_STATE_INITIALIZING: 2112 hci_initializing_state_machine(); 2113 break; 2114 2115 case HCI_STATE_HALTING: 2116 2117 log_info("HCI_STATE_HALTING"); 2118 // close all open connections 2119 connection = (hci_connection_t *) hci_stack->connections; 2120 if (connection){ 2121 2122 // send disconnect 2123 if (!hci_can_send_command_packet_now()) return; 2124 2125 log_info("HCI_STATE_HALTING, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2126 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2127 2128 // send disconnected event right away - causes higher layer connections to get closed, too. 2129 hci_shutdown_connection(connection); 2130 return; 2131 } 2132 log_info("HCI_STATE_HALTING, calling off"); 2133 2134 // switch mode 2135 hci_power_control_off(); 2136 2137 log_info("HCI_STATE_HALTING, emitting state"); 2138 hci_emit_state(); 2139 log_info("HCI_STATE_HALTING, done"); 2140 break; 2141 2142 case HCI_STATE_FALLING_ASLEEP: 2143 switch(hci_stack->substate) { 2144 case 0: 2145 log_info("HCI_STATE_FALLING_ASLEEP"); 2146 // close all open connections 2147 connection = (hci_connection_t *) hci_stack->connections; 2148 2149 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2150 // don't close connections, if H4 supports power management 2151 if (bt_control_iphone_power_management_enabled()){ 2152 connection = NULL; 2153 } 2154 #endif 2155 if (connection){ 2156 2157 // send disconnect 2158 if (!hci_can_send_command_packet_now()) return; 2159 2160 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2161 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2162 2163 // send disconnected event right away - causes higher layer connections to get closed, too. 2164 hci_shutdown_connection(connection); 2165 return; 2166 } 2167 2168 if (hci_classic_supported()){ 2169 // disable page and inquiry scan 2170 if (!hci_can_send_command_packet_now()) return; 2171 2172 log_info("HCI_STATE_HALTING, disabling inq scans"); 2173 hci_send_cmd(&hci_write_scan_enable, hci_stack->connectable << 1); // drop inquiry scan but keep page scan 2174 2175 // continue in next sub state 2176 hci_stack->substate++; 2177 break; 2178 } 2179 // fall through for ble-only chips 2180 2181 case 2: 2182 log_info("HCI_STATE_HALTING, calling sleep"); 2183 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2184 // don't actually go to sleep, if H4 supports power management 2185 if (bt_control_iphone_power_management_enabled()){ 2186 // SLEEP MODE reached 2187 hci_stack->state = HCI_STATE_SLEEPING; 2188 hci_emit_state(); 2189 break; 2190 } 2191 #endif 2192 // switch mode 2193 hci_power_control_sleep(); // changes hci_stack->state to SLEEP 2194 hci_emit_state(); 2195 break; 2196 2197 default: 2198 break; 2199 } 2200 break; 2201 2202 default: 2203 break; 2204 } 2205 } 2206 2207 int hci_send_cmd_packet(uint8_t *packet, int size){ 2208 bd_addr_t addr; 2209 hci_connection_t * conn; 2210 // house-keeping 2211 2212 // create_connection? 2213 if (IS_COMMAND(packet, hci_create_connection)){ 2214 bt_flip_addr(addr, &packet[3]); 2215 log_info("Create_connection to %s", bd_addr_to_str(addr)); 2216 2217 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2218 if (!conn){ 2219 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2220 if (!conn){ 2221 // notify client that alloc failed 2222 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 2223 return 0; // don't sent packet to controller 2224 } 2225 conn->state = SEND_CREATE_CONNECTION; 2226 } 2227 log_info("conn state %u", conn->state); 2228 switch (conn->state){ 2229 // if connection active exists 2230 case OPEN: 2231 // and OPEN, emit connection complete command, don't send to controller 2232 hci_emit_connection_complete(conn, 0); 2233 return 0; 2234 case SEND_CREATE_CONNECTION: 2235 // connection created by hci, e.g. dedicated bonding 2236 break; 2237 default: 2238 // otherwise, just ignore as it is already in the open process 2239 return 0; 2240 } 2241 conn->state = SENT_CREATE_CONNECTION; 2242 } 2243 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 2244 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 2245 } 2246 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 2247 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 2248 } 2249 2250 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 2251 if (hci_stack->remote_device_db){ 2252 bt_flip_addr(addr, &packet[3]); 2253 hci_stack->remote_device_db->delete_link_key(&addr); 2254 } 2255 } 2256 2257 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply) 2258 || IS_COMMAND(packet, hci_pin_code_request_reply)){ 2259 bt_flip_addr(addr, &packet[3]); 2260 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2261 if (conn){ 2262 connectionClearAuthenticationFlags(conn, LEGACY_PAIRING_ACTIVE); 2263 } 2264 } 2265 2266 if (IS_COMMAND(packet, hci_user_confirmation_request_negative_reply) 2267 || IS_COMMAND(packet, hci_user_confirmation_request_reply) 2268 || IS_COMMAND(packet, hci_user_passkey_request_negative_reply) 2269 || IS_COMMAND(packet, hci_user_passkey_request_reply)) { 2270 bt_flip_addr(addr, &packet[3]); 2271 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2272 if (conn){ 2273 connectionClearAuthenticationFlags(conn, SSP_PAIRING_ACTIVE); 2274 } 2275 } 2276 2277 #ifdef HAVE_BLE 2278 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 2279 hci_stack->adv_addr_type = packet[8]; 2280 } 2281 if (IS_COMMAND(packet, hci_le_set_random_address)){ 2282 bt_flip_addr(hci_stack->adv_address, &packet[3]); 2283 } 2284 #endif 2285 2286 hci_stack->num_cmd_packets--; 2287 2288 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, packet, size); 2289 int err = hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 2290 2291 // release packet buffer for synchronous transport implementations 2292 if (hci_transport_synchronous() && (packet == hci_stack->hci_packet_buffer)){ 2293 hci_stack->hci_packet_buffer_reserved = 0; 2294 } 2295 2296 return err; 2297 } 2298 2299 // disconnect because of security block 2300 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 2301 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2302 if (!connection) return; 2303 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 2304 } 2305 2306 2307 // Configure Secure Simple Pairing 2308 2309 // enable will enable SSP during init 2310 void hci_ssp_set_enable(int enable){ 2311 hci_stack->ssp_enable = enable; 2312 } 2313 2314 int hci_local_ssp_activated(){ 2315 return hci_ssp_supported() && hci_stack->ssp_enable; 2316 } 2317 2318 // if set, BTstack will respond to io capability request using authentication requirement 2319 void hci_ssp_set_io_capability(int io_capability){ 2320 hci_stack->ssp_io_capability = io_capability; 2321 } 2322 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 2323 hci_stack->ssp_authentication_requirement = authentication_requirement; 2324 } 2325 2326 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 2327 void hci_ssp_set_auto_accept(int auto_accept){ 2328 hci_stack->ssp_auto_accept = auto_accept; 2329 } 2330 2331 /** 2332 * pre: numcmds >= 0 - it's allowed to send a command to the controller 2333 */ 2334 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 2335 2336 if (!hci_can_send_command_packet_now()){ 2337 log_error("hci_send_cmd called but cannot send packet now"); 2338 return 0; 2339 } 2340 2341 // for HCI INITIALIZATION 2342 // log_info("hci_send_cmd: opcode %04x", cmd->opcode); 2343 hci_stack->last_cmd_opcode = cmd->opcode; 2344 2345 hci_reserve_packet_buffer(); 2346 uint8_t * packet = hci_stack->hci_packet_buffer; 2347 2348 va_list argptr; 2349 va_start(argptr, cmd); 2350 uint16_t size = hci_create_cmd_internal(packet, cmd, argptr); 2351 va_end(argptr); 2352 2353 return hci_send_cmd_packet(packet, size); 2354 } 2355 2356 // Create various non-HCI events. 2357 // TODO: generalize, use table similar to hci_create_command 2358 2359 void hci_emit_state(){ 2360 log_info("BTSTACK_EVENT_STATE %u", hci_stack->state); 2361 uint8_t event[3]; 2362 event[0] = BTSTACK_EVENT_STATE; 2363 event[1] = sizeof(event) - 2; 2364 event[2] = hci_stack->state; 2365 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2366 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2367 } 2368 2369 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 2370 uint8_t event[13]; 2371 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 2372 event[1] = sizeof(event) - 2; 2373 event[2] = status; 2374 bt_store_16(event, 3, conn->con_handle); 2375 bt_flip_addr(&event[5], conn->address); 2376 event[11] = 1; // ACL connection 2377 event[12] = 0; // encryption disabled 2378 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2379 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2380 } 2381 2382 void hci_emit_le_connection_complete(uint8_t address_type, bd_addr_t * address, uint16_t conn_handle, uint8_t status){ 2383 uint8_t event[21]; 2384 event[0] = HCI_EVENT_LE_META; 2385 event[1] = sizeof(event) - 2; 2386 event[2] = HCI_SUBEVENT_LE_CONNECTION_COMPLETE; 2387 event[3] = status; 2388 bt_store_16(event, 4, conn_handle); 2389 event[6] = 0; // TODO: role 2390 event[7] = address_type; 2391 bt_flip_addr(&event[8], *address); 2392 bt_store_16(event, 14, 0); // interval 2393 bt_store_16(event, 16, 0); // latency 2394 bt_store_16(event, 18, 0); // supervision timeout 2395 event[20] = 0; // master clock accuracy 2396 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2397 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2398 } 2399 2400 void hci_emit_disconnection_complete(uint16_t handle, uint8_t reason){ 2401 uint8_t event[6]; 2402 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 2403 event[1] = sizeof(event) - 2; 2404 event[2] = 0; // status = OK 2405 bt_store_16(event, 3, handle); 2406 event[5] = reason; 2407 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2408 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2409 } 2410 2411 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 2412 if (disable_l2cap_timeouts) return; 2413 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 2414 uint8_t event[4]; 2415 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 2416 event[1] = sizeof(event) - 2; 2417 bt_store_16(event, 2, conn->con_handle); 2418 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2419 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2420 } 2421 2422 void hci_emit_nr_connections_changed(){ 2423 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 2424 uint8_t event[3]; 2425 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 2426 event[1] = sizeof(event) - 2; 2427 event[2] = nr_hci_connections(); 2428 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2429 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2430 } 2431 2432 void hci_emit_hci_open_failed(){ 2433 log_info("BTSTACK_EVENT_POWERON_FAILED"); 2434 uint8_t event[2]; 2435 event[0] = BTSTACK_EVENT_POWERON_FAILED; 2436 event[1] = sizeof(event) - 2; 2437 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2438 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2439 } 2440 2441 #ifndef EMBEDDED 2442 void hci_emit_btstack_version() { 2443 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 2444 uint8_t event[6]; 2445 event[0] = BTSTACK_EVENT_VERSION; 2446 event[1] = sizeof(event) - 2; 2447 event[2] = BTSTACK_MAJOR; 2448 event[3] = BTSTACK_MINOR; 2449 bt_store_16(event, 4, BTSTACK_REVISION); 2450 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2451 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2452 } 2453 #endif 2454 2455 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 2456 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 2457 uint8_t event[3]; 2458 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 2459 event[1] = sizeof(event) - 2; 2460 event[2] = enabled; 2461 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2462 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2463 } 2464 2465 void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){ 2466 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 2467 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 2468 event[1] = sizeof(event) - 2 - 1; 2469 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 2470 bt_flip_addr(&event[3], *addr); 2471 memcpy(&event[9], name, 248); 2472 2473 event[9+248] = 0; // assert \0 for log_info 2474 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(*addr), &event[9]); 2475 2476 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 2477 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 2478 } 2479 2480 void hci_emit_discoverable_enabled(uint8_t enabled){ 2481 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 2482 uint8_t event[3]; 2483 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 2484 event[1] = sizeof(event) - 2; 2485 event[2] = enabled; 2486 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2487 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2488 } 2489 2490 void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){ 2491 log_info("hci_emit_security_level %u for handle %x", level, con_handle); 2492 uint8_t event[5]; 2493 int pos = 0; 2494 event[pos++] = GAP_SECURITY_LEVEL; 2495 event[pos++] = sizeof(event) - 2; 2496 bt_store_16(event, 2, con_handle); 2497 pos += 2; 2498 event[pos++] = level; 2499 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2500 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2501 } 2502 2503 void hci_emit_dedicated_bonding_result(bd_addr_t address, uint8_t status){ 2504 log_info("hci_emit_dedicated_bonding_result %u ", status); 2505 uint8_t event[9]; 2506 int pos = 0; 2507 event[pos++] = GAP_DEDICATED_BONDING_COMPLETED; 2508 event[pos++] = sizeof(event) - 2; 2509 event[pos++] = status; 2510 bt_flip_addr( * (bd_addr_t *) &event[pos], address); 2511 pos += 6; 2512 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2513 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2514 } 2515 2516 // query if remote side supports SSP 2517 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 2518 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2519 if (!connection) return 0; 2520 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 2521 } 2522 2523 int hci_ssp_supported_on_both_sides(hci_con_handle_t handle){ 2524 return hci_local_ssp_activated() && hci_remote_ssp_supported(handle); 2525 } 2526 2527 // GAP API 2528 /** 2529 * @bbrief enable/disable bonding. default is enabled 2530 * @praram enabled 2531 */ 2532 void gap_set_bondable_mode(int enable){ 2533 hci_stack->bondable = enable ? 1 : 0; 2534 } 2535 2536 /** 2537 * @brief map link keys to security levels 2538 */ 2539 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 2540 switch (link_key_type){ 2541 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 2542 return LEVEL_4; 2543 case COMBINATION_KEY: 2544 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 2545 return LEVEL_3; 2546 default: 2547 return LEVEL_2; 2548 } 2549 } 2550 2551 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 2552 if (!connection) return LEVEL_0; 2553 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 2554 return gap_security_level_for_link_key_type(connection->link_key_type); 2555 } 2556 2557 2558 int gap_mitm_protection_required_for_security_level(gap_security_level_t level){ 2559 log_info("gap_mitm_protection_required_for_security_level %u", level); 2560 return level > LEVEL_2; 2561 } 2562 2563 /** 2564 * @brief get current security level 2565 */ 2566 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 2567 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2568 if (!connection) return LEVEL_0; 2569 return gap_security_level_for_connection(connection); 2570 } 2571 2572 /** 2573 * @brief request connection to device to 2574 * @result GAP_AUTHENTICATION_RESULT 2575 */ 2576 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 2577 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2578 if (!connection){ 2579 hci_emit_security_level(con_handle, LEVEL_0); 2580 return; 2581 } 2582 gap_security_level_t current_level = gap_security_level(con_handle); 2583 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 2584 if (current_level >= requested_level){ 2585 hci_emit_security_level(con_handle, current_level); 2586 return; 2587 } 2588 2589 connection->requested_security_level = requested_level; 2590 2591 #if 0 2592 // sending encryption request without a link key results in an error. 2593 // TODO: figure out how to use it properly 2594 2595 // would enabling ecnryption suffice (>= LEVEL_2)? 2596 if (hci_stack->remote_device_db){ 2597 link_key_type_t link_key_type; 2598 link_key_t link_key; 2599 if (hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type)){ 2600 if (gap_security_level_for_link_key_type(link_key_type) >= requested_level){ 2601 connection->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 2602 return; 2603 } 2604 } 2605 } 2606 #endif 2607 2608 // try to authenticate connection 2609 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 2610 hci_run(); 2611 } 2612 2613 /** 2614 * @brief start dedicated bonding with device. disconnect after bonding 2615 * @param device 2616 * @param request MITM protection 2617 * @result GAP_DEDICATED_BONDING_COMPLETE 2618 */ 2619 int gap_dedicated_bonding(bd_addr_t device, int mitm_protection_required){ 2620 2621 // create connection state machine 2622 hci_connection_t * connection = create_connection_for_bd_addr_and_type(device, BD_ADDR_TYPE_CLASSIC); 2623 2624 if (!connection){ 2625 return BTSTACK_MEMORY_ALLOC_FAILED; 2626 } 2627 2628 // delete linkn key 2629 hci_drop_link_key_for_bd_addr( (bd_addr_t *) &device); 2630 2631 // configure LEVEL_2/3, dedicated bonding 2632 connection->state = SEND_CREATE_CONNECTION; 2633 connection->requested_security_level = mitm_protection_required ? LEVEL_3 : LEVEL_2; 2634 log_info("gap_dedicated_bonding, mitm %u -> level %u", mitm_protection_required, connection->requested_security_level); 2635 connection->bonding_flags = BONDING_DEDICATED; 2636 2637 // wait for GAP Security Result and send GAP Dedicated Bonding complete 2638 2639 // handle: connnection failure (connection complete != ok) 2640 // handle: authentication failure 2641 // handle: disconnect on done 2642 2643 hci_run(); 2644 2645 return 0; 2646 } 2647 2648 void gap_set_local_name(const char * local_name){ 2649 hci_stack->local_name = local_name; 2650 } 2651 2652 le_command_status_t le_central_start_scan(){ 2653 if (hci_stack->le_scanning_state == LE_SCANNING) return BLE_PERIPHERAL_OK; 2654 hci_stack->le_scanning_state = LE_START_SCAN; 2655 hci_run(); 2656 return BLE_PERIPHERAL_OK; 2657 } 2658 2659 le_command_status_t le_central_stop_scan(){ 2660 if ( hci_stack->le_scanning_state == LE_SCAN_IDLE) return BLE_PERIPHERAL_OK; 2661 hci_stack->le_scanning_state = LE_STOP_SCAN; 2662 hci_run(); 2663 return BLE_PERIPHERAL_OK; 2664 } 2665 2666 void le_central_set_scan_parameters(uint8_t scan_type, uint16_t scan_interval, uint16_t scan_window){ 2667 hci_stack->le_scan_type = scan_type; 2668 hci_stack->le_scan_interval = scan_interval; 2669 hci_stack->le_scan_window = scan_window; 2670 hci_run(); 2671 } 2672 2673 le_command_status_t le_central_connect(bd_addr_t * addr, bd_addr_type_t addr_type){ 2674 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 2675 if (!conn){ 2676 log_info("le_central_connect: no connection exists yet, creating context"); 2677 conn = create_connection_for_bd_addr_and_type(*addr, addr_type); 2678 if (!conn){ 2679 // notify client that alloc failed 2680 hci_emit_le_connection_complete(addr_type, addr, 0, BTSTACK_MEMORY_ALLOC_FAILED); 2681 log_info("le_central_connect: failed to alloc hci_connection_t"); 2682 return BLE_PERIPHERAL_NOT_CONNECTED; // don't sent packet to controller 2683 } 2684 conn->state = SEND_CREATE_CONNECTION; 2685 log_info("le_central_connect: send create connection next"); 2686 hci_run(); 2687 return BLE_PERIPHERAL_OK; 2688 } 2689 2690 if (!hci_is_le_connection(conn) || 2691 conn->state == SEND_CREATE_CONNECTION || 2692 conn->state == SENT_CREATE_CONNECTION) { 2693 hci_emit_le_connection_complete(conn->address_type, &conn->address, 0, ERROR_CODE_COMMAND_DISALLOWED); 2694 log_error("le_central_connect: classic connection or connect is already being created"); 2695 return BLE_PERIPHERAL_IN_WRONG_STATE; 2696 } 2697 2698 log_info("le_central_connect: context exists with state %u", conn->state); 2699 hci_emit_le_connection_complete(conn->address_type, &conn->address, conn->con_handle, 0); 2700 hci_run(); 2701 return BLE_PERIPHERAL_OK; 2702 } 2703 2704 // @assumption: only a single outgoing LE Connection exists 2705 static hci_connection_t * le_central_get_outgoing_connection(){ 2706 linked_item_t *it; 2707 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 2708 hci_connection_t * conn = (hci_connection_t *) it; 2709 if (!hci_is_le_connection(conn)) continue; 2710 switch (conn->state){ 2711 case SEND_CREATE_CONNECTION: 2712 case SENT_CREATE_CONNECTION: 2713 return conn; 2714 default: 2715 break; 2716 }; 2717 } 2718 return NULL; 2719 } 2720 2721 le_command_status_t le_central_connect_cancel(){ 2722 hci_connection_t * conn = le_central_get_outgoing_connection(); 2723 switch (conn->state){ 2724 case SEND_CREATE_CONNECTION: 2725 // skip sending create connection and emit event instead 2726 hci_emit_le_connection_complete(conn->address_type, &conn->address, 0, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 2727 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 2728 btstack_memory_hci_connection_free( conn ); 2729 break; 2730 case SENT_CREATE_CONNECTION: 2731 // request to send cancel connection 2732 conn->state = SEND_CANCEL_CONNECTION; 2733 hci_run(); 2734 break; 2735 default: 2736 break; 2737 } 2738 return BLE_PERIPHERAL_OK; 2739 } 2740 2741 /** 2742 * @brief Updates the connection parameters for a given LE connection 2743 * @param handle 2744 * @param conn_interval_min (unit: 1.25ms) 2745 * @param conn_interval_max (unit: 1.25ms) 2746 * @param conn_latency 2747 * @param supervision_timeout (unit: 10ms) 2748 * @returns 0 if ok 2749 */ 2750 int gap_update_connection_parameters(hci_con_handle_t con_handle, uint16_t conn_interval_min, 2751 uint16_t conn_interval_max, uint16_t conn_latency, uint16_t supervision_timeout){ 2752 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2753 if (!connection) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2754 connection->le_conn_interval_min = conn_interval_min; 2755 connection->le_conn_interval_max = conn_interval_max; 2756 connection->le_conn_latency = conn_latency; 2757 connection->le_supervision_timeout = supervision_timeout; 2758 return 0; 2759 } 2760 2761 le_command_status_t gap_disconnect(hci_con_handle_t handle){ 2762 hci_connection_t * conn = hci_connection_for_handle(handle); 2763 if (!conn){ 2764 hci_emit_disconnection_complete(handle, 0); 2765 return BLE_PERIPHERAL_OK; 2766 } 2767 conn->state = SEND_DISCONNECT; 2768 hci_run(); 2769 return BLE_PERIPHERAL_OK; 2770 } 2771 2772 void hci_disconnect_all(){ 2773 linked_list_iterator_t it; 2774 linked_list_iterator_init(&it, &hci_stack->connections); 2775 while (linked_list_iterator_has_next(&it)){ 2776 hci_connection_t * con = (hci_connection_t*) linked_list_iterator_next(&it); 2777 if (con->state == SENT_DISCONNECT) continue; 2778 con->state = SEND_DISCONNECT; 2779 } 2780 hci_run(); 2781 } 2782