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 * @note: bd_addr is passed in as litle endian uint8_t * as it is called from parsing packets 234 */ 235 static void hci_add_connection_flags_for_flipped_bd_addr(uint8_t *bd_addr, hci_authentication_flags_t flags){ 236 bd_addr_t addr; 237 bt_flip_addr(addr, bd_addr); 238 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 239 if (conn) { 240 connectionSetAuthenticationFlags(conn, flags); 241 hci_connection_timestamp(conn); 242 } 243 } 244 245 int hci_authentication_active_for_handle(hci_con_handle_t handle){ 246 hci_connection_t * conn = hci_connection_for_handle(handle); 247 if (!conn) return 0; 248 if (conn->authentication_flags & LEGACY_PAIRING_ACTIVE) return 1; 249 if (conn->authentication_flags & SSP_PAIRING_ACTIVE) return 1; 250 return 0; 251 } 252 253 void hci_drop_link_key_for_bd_addr(bd_addr_t addr){ 254 if (hci_stack->remote_device_db) { 255 hci_stack->remote_device_db->delete_link_key(addr); 256 } 257 } 258 259 int hci_is_le_connection(hci_connection_t * connection){ 260 return connection->address_type == BD_ADDR_TYPE_LE_PUBLIC || 261 connection->address_type == BD_ADDR_TYPE_LE_RANDOM; 262 } 263 264 265 /** 266 * count connections 267 */ 268 static int nr_hci_connections(void){ 269 int count = 0; 270 linked_item_t *it; 271 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next, count++); 272 return count; 273 } 274 275 /** 276 * Dummy handler called by HCI 277 */ 278 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 279 } 280 281 uint8_t hci_number_outgoing_packets(hci_con_handle_t handle){ 282 hci_connection_t * connection = hci_connection_for_handle(handle); 283 if (!connection) { 284 log_error("hci_number_outgoing_packets: connection for handle %u does not exist!", handle); 285 return 0; 286 } 287 return connection->num_acl_packets_sent; 288 } 289 290 uint8_t hci_number_free_acl_slots_for_handle(hci_con_handle_t con_handle){ 291 292 int num_packets_sent_classic = 0; 293 int num_packets_sent_le = 0; 294 295 bd_addr_type_t address_type = BD_ADDR_TYPE_UNKNOWN; 296 297 linked_item_t *it; 298 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 299 hci_connection_t * connection = (hci_connection_t *) it; 300 if (connection->address_type == BD_ADDR_TYPE_CLASSIC){ 301 num_packets_sent_classic += connection->num_acl_packets_sent; 302 } else { 303 num_packets_sent_le += connection->num_acl_packets_sent; 304 } 305 // ignore connections that are not open, e.g., in state RECEIVED_DISCONNECTION_COMPLETE 306 if (connection->con_handle == con_handle && connection->state == OPEN){ 307 address_type = connection->address_type; 308 } 309 } 310 311 int free_slots_classic = hci_stack->acl_packets_total_num - num_packets_sent_classic; 312 int free_slots_le = 0; 313 314 if (free_slots_classic < 0){ 315 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); 316 return 0; 317 } 318 319 if (hci_stack->le_acl_packets_total_num){ 320 // if we have LE slots, they are used 321 free_slots_le = hci_stack->le_acl_packets_total_num - num_packets_sent_le; 322 if (free_slots_le < 0){ 323 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); 324 return 0; 325 } 326 } else { 327 // otherwise, classic slots are used for LE, too 328 free_slots_classic -= num_packets_sent_le; 329 if (free_slots_classic < 0){ 330 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); 331 return 0; 332 } 333 } 334 335 switch (address_type){ 336 case BD_ADDR_TYPE_UNKNOWN: 337 log_error("hci_number_free_acl_slots: handle 0x%04x not in connection list", con_handle); 338 return 0; 339 340 case BD_ADDR_TYPE_CLASSIC: 341 return free_slots_classic; 342 343 default: 344 if (hci_stack->le_acl_packets_total_num){ 345 return free_slots_le; 346 } 347 return free_slots_classic; 348 } 349 } 350 351 int hci_number_free_sco_slots_for_handle(hci_con_handle_t handle){ 352 int num_sco_packets_sent = 0; 353 linked_item_t *it; 354 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 355 hci_connection_t * connection = (hci_connection_t *) it; 356 num_sco_packets_sent += connection->num_sco_packets_sent; 357 } 358 if (num_sco_packets_sent > hci_stack->sco_packets_total_num){ 359 log_info("hci_number_free_sco_slots_for_handle: outgoing packets (%u) > total packets ()", num_sco_packets_sent, hci_stack->sco_packets_total_num); 360 return 0; 361 } 362 return hci_stack->sco_packets_total_num - num_sco_packets_sent; 363 } 364 365 // new functions replacing hci_can_send_packet_now[_using_packet_buffer] 366 int hci_can_send_command_packet_now(void){ 367 if (hci_stack->hci_packet_buffer_reserved) return 0; 368 369 // check for async hci transport implementations 370 if (hci_stack->hci_transport->can_send_packet_now){ 371 if (!hci_stack->hci_transport->can_send_packet_now(HCI_COMMAND_DATA_PACKET)){ 372 return 0; 373 } 374 } 375 376 return hci_stack->num_cmd_packets > 0; 377 } 378 379 int hci_can_send_prepared_acl_packet_now(hci_con_handle_t con_handle) { 380 // check for async hci transport implementations 381 if (hci_stack->hci_transport->can_send_packet_now){ 382 if (!hci_stack->hci_transport->can_send_packet_now(HCI_ACL_DATA_PACKET)){ 383 return 0; 384 } 385 } 386 return hci_number_free_acl_slots_for_handle(con_handle) > 0; 387 } 388 389 int hci_can_send_acl_packet_now(hci_con_handle_t con_handle){ 390 if (hci_stack->hci_packet_buffer_reserved) return 0; 391 return hci_can_send_prepared_acl_packet_now(con_handle); 392 } 393 394 int hci_can_send_prepared_sco_packet_now(hci_con_handle_t con_handle){ 395 if (hci_stack->hci_transport->can_send_packet_now){ 396 if (!hci_stack->hci_transport->can_send_packet_now(HCI_SCO_DATA_PACKET)){ 397 return 0; 398 } 399 } 400 return hci_number_free_sco_slots_for_handle(con_handle) > 0; 401 } 402 403 int hci_can_send_sco_packet_now(hci_con_handle_t con_handle){ 404 if (hci_stack->hci_packet_buffer_reserved) return 0; 405 return hci_can_send_prepared_sco_packet_now(con_handle); 406 } 407 408 // used for internal checks in l2cap[-le].c 409 int hci_is_packet_buffer_reserved(void){ 410 return hci_stack->hci_packet_buffer_reserved; 411 } 412 413 // reserves outgoing packet buffer. @returns 1 if successful 414 int hci_reserve_packet_buffer(void){ 415 if (hci_stack->hci_packet_buffer_reserved) { 416 log_error("hci_reserve_packet_buffer called but buffer already reserved"); 417 return 0; 418 } 419 hci_stack->hci_packet_buffer_reserved = 1; 420 return 1; 421 } 422 423 void hci_release_packet_buffer(void){ 424 hci_stack->hci_packet_buffer_reserved = 0; 425 } 426 427 // assumption: synchronous implementations don't provide can_send_packet_now as they don't keep the buffer after the call 428 int hci_transport_synchronous(void){ 429 return hci_stack->hci_transport->can_send_packet_now == NULL; 430 } 431 432 uint16_t hci_max_acl_le_data_packet_length(void){ 433 return hci_stack->le_data_packets_length > 0 ? hci_stack->le_data_packets_length : hci_stack->acl_data_packet_length; 434 } 435 436 static int hci_send_acl_packet_fragments(hci_connection_t *connection){ 437 438 // 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); 439 440 // max ACL data packet length depends on connection type (LE vs. Classic) and available buffers 441 uint16_t max_acl_data_packet_length = hci_stack->acl_data_packet_length; 442 if (hci_is_le_connection(connection) && hci_stack->le_data_packets_length > 0){ 443 max_acl_data_packet_length = hci_stack->le_data_packets_length; 444 } 445 446 // testing: reduce buffer to minimum 447 // max_acl_data_packet_length = 52; 448 449 int err; 450 // multiple packets could be send on a synchronous HCI transport 451 while (1){ 452 453 // get current data 454 const uint16_t acl_header_pos = hci_stack->acl_fragmentation_pos - 4; 455 int current_acl_data_packet_length = hci_stack->acl_fragmentation_total_size - hci_stack->acl_fragmentation_pos; 456 int more_fragments = 0; 457 458 // if ACL packet is larger than Bluetooth packet buffer, only send max_acl_data_packet_length 459 if (current_acl_data_packet_length > max_acl_data_packet_length){ 460 more_fragments = 1; 461 current_acl_data_packet_length = max_acl_data_packet_length; 462 } 463 464 // copy handle_and_flags if not first fragment and update packet boundary flags to be 01 (continuing fragmnent) 465 if (acl_header_pos > 0){ 466 uint16_t handle_and_flags = READ_BT_16(hci_stack->hci_packet_buffer, 0); 467 handle_and_flags = (handle_and_flags & 0xcfff) | (1 << 12); 468 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos, handle_and_flags); 469 } 470 471 // update header len 472 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos + 2, current_acl_data_packet_length); 473 474 // count packet 475 connection->num_acl_packets_sent++; 476 477 // send packet 478 uint8_t * packet = &hci_stack->hci_packet_buffer[acl_header_pos]; 479 const int size = current_acl_data_packet_length + 4; 480 hci_dump_packet(HCI_ACL_DATA_PACKET, 0, packet, size); 481 err = hci_stack->hci_transport->send_packet(HCI_ACL_DATA_PACKET, packet, size); 482 483 // done yet? 484 if (!more_fragments) break; 485 486 // update start of next fragment to send 487 hci_stack->acl_fragmentation_pos += current_acl_data_packet_length; 488 489 // can send more? 490 if (!hci_can_send_prepared_acl_packet_now(connection->con_handle)) return err; 491 } 492 493 // done 494 hci_stack->acl_fragmentation_pos = 0; 495 hci_stack->acl_fragmentation_total_size = 0; 496 497 // release buffer now for synchronous transport 498 if (hci_transport_synchronous()){ 499 hci_release_packet_buffer(); 500 // notify upper stack that iit might be possible to send again 501 uint8_t event[] = { DAEMON_EVENT_HCI_PACKET_SENT, 0}; 502 hci_stack->packet_handler(HCI_EVENT_PACKET, &event[0], sizeof(event)); 503 } 504 505 return err; 506 } 507 508 // pre: caller has reserved the packet buffer 509 int hci_send_acl_packet_buffer(int size){ 510 511 // log_info("hci_send_acl_packet_buffer size %u", size); 512 513 if (!hci_stack->hci_packet_buffer_reserved) { 514 log_error("hci_send_acl_packet_buffer called without reserving packet buffer"); 515 return 0; 516 } 517 518 uint8_t * packet = hci_stack->hci_packet_buffer; 519 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 520 521 // check for free places on Bluetooth module 522 if (!hci_can_send_prepared_acl_packet_now(con_handle)) { 523 log_error("hci_send_acl_packet_buffer called but no free ACL buffers on controller"); 524 hci_release_packet_buffer(); 525 return BTSTACK_ACL_BUFFERS_FULL; 526 } 527 528 hci_connection_t *connection = hci_connection_for_handle( con_handle); 529 if (!connection) { 530 log_error("hci_send_acl_packet_buffer called but no connection for handle 0x%04x", con_handle); 531 hci_release_packet_buffer(); 532 return 0; 533 } 534 hci_connection_timestamp(connection); 535 536 // hci_dump_packet( HCI_ACL_DATA_PACKET, 0, packet, size); 537 538 // setup data 539 hci_stack->acl_fragmentation_total_size = size; 540 hci_stack->acl_fragmentation_pos = 4; // start of L2CAP packet 541 542 return hci_send_acl_packet_fragments(connection); 543 } 544 545 // pre: caller has reserved the packet buffer 546 int hci_send_sco_packet_buffer(int size){ 547 548 // log_info("hci_send_acl_packet_buffer size %u", size); 549 550 if (!hci_stack->hci_packet_buffer_reserved) { 551 log_error("hci_send_acl_packet_buffer called without reserving packet buffer"); 552 return 0; 553 } 554 555 uint8_t * packet = hci_stack->hci_packet_buffer; 556 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); // same for ACL and SCO 557 558 // check for free places on Bluetooth module 559 if (!hci_can_send_prepared_sco_packet_now(con_handle)) { 560 log_error("hci_send_sco_packet_buffer called but no free ACL buffers on controller"); 561 hci_release_packet_buffer(); 562 return BTSTACK_ACL_BUFFERS_FULL; 563 } 564 565 // track send packet in connection struct 566 hci_connection_t *connection = hci_connection_for_handle( con_handle); 567 if (!connection) { 568 log_error("hci_send_sco_packet_buffer called but no connection for handle 0x%04x", con_handle); 569 hci_release_packet_buffer(); 570 return 0; 571 } 572 connection->num_sco_packets_sent++; 573 574 hci_dump_packet( HCI_SCO_DATA_PACKET, 0, packet, size); 575 return hci_stack->hci_transport->send_packet(HCI_SCO_DATA_PACKET, packet, size); 576 } 577 578 static void acl_handler(uint8_t *packet, int size){ 579 580 // log_info("acl_handler: size %u", size); 581 582 // get info 583 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 584 hci_connection_t *conn = hci_connection_for_handle(con_handle); 585 uint8_t acl_flags = READ_ACL_FLAGS(packet); 586 uint16_t acl_length = READ_ACL_LENGTH(packet); 587 588 // ignore non-registered handle 589 if (!conn){ 590 log_error( "hci.c: acl_handler called with non-registered handle %u!" , con_handle); 591 return; 592 } 593 594 // assert packet is complete 595 if (acl_length + 4 != size){ 596 log_error("hci.c: acl_handler called with ACL packet of wrong size %u, expected %u => dropping packet", size, acl_length + 4); 597 return; 598 } 599 600 // update idle timestamp 601 hci_connection_timestamp(conn); 602 603 // handle different packet types 604 switch (acl_flags & 0x03) { 605 606 case 0x01: // continuation fragment 607 608 // sanity checks 609 if (conn->acl_recombination_pos == 0) { 610 log_error( "ACL Cont Fragment but no first fragment for handle 0x%02x", con_handle); 611 return; 612 } 613 if (conn->acl_recombination_pos + acl_length > 4 + HCI_ACL_BUFFER_SIZE){ 614 log_error( "ACL Cont Fragment to large: combined packet %u > buffer size %u for handle 0x%02x", 615 conn->acl_recombination_pos + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle); 616 conn->acl_recombination_pos = 0; 617 return; 618 } 619 620 // append fragment payload (header already stored) 621 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE + conn->acl_recombination_pos], &packet[4], acl_length ); 622 conn->acl_recombination_pos += acl_length; 623 624 // log_error( "ACL Cont Fragment: acl_len %u, combined_len %u, l2cap_len %u", acl_length, 625 // conn->acl_recombination_pos, conn->acl_recombination_length); 626 627 // forward complete L2CAP packet if complete. 628 if (conn->acl_recombination_pos >= conn->acl_recombination_length + 4 + 4){ // pos already incl. ACL header 629 630 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, &conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], conn->acl_recombination_pos); 631 // reset recombination buffer 632 conn->acl_recombination_length = 0; 633 conn->acl_recombination_pos = 0; 634 } 635 break; 636 637 case 0x02: { // first fragment 638 639 // sanity check 640 if (conn->acl_recombination_pos) { 641 log_error( "ACL First Fragment but data in buffer for handle 0x%02x, dropping stale fragments", con_handle); 642 conn->acl_recombination_pos = 0; 643 } 644 645 // peek into L2CAP packet! 646 uint16_t l2cap_length = READ_L2CAP_LENGTH( packet ); 647 648 // log_info( "ACL First Fragment: acl_len %u, l2cap_len %u", acl_length, l2cap_length); 649 650 // compare fragment size to L2CAP packet size 651 if (acl_length >= l2cap_length + 4){ 652 653 // forward fragment as L2CAP packet 654 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, packet, acl_length + 4); 655 656 } else { 657 658 if (acl_length > HCI_ACL_BUFFER_SIZE){ 659 log_error( "ACL First Fragment to large: fragment %u > buffer size %u for handle 0x%02x", 660 4 + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle); 661 return; 662 } 663 664 // store first fragment and tweak acl length for complete package 665 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], packet, acl_length + 4); 666 conn->acl_recombination_pos = acl_length + 4; 667 conn->acl_recombination_length = l2cap_length; 668 bt_store_16(conn->acl_recombination_buffer, HCI_INCOMING_PRE_BUFFER_SIZE + 2, l2cap_length +4); 669 } 670 break; 671 672 } 673 default: 674 log_error( "hci.c: acl_handler called with invalid packet boundary flags %u", acl_flags & 0x03); 675 return; 676 } 677 678 // execute main loop 679 hci_run(); 680 } 681 682 static void hci_shutdown_connection(hci_connection_t *conn){ 683 log_info("Connection closed: handle 0x%x, %s", conn->con_handle, bd_addr_to_str(conn->address)); 684 685 run_loop_remove_timer(&conn->timeout); 686 687 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 688 btstack_memory_hci_connection_free( conn ); 689 690 // now it's gone 691 hci_emit_nr_connections_changed(); 692 } 693 694 static const uint16_t packet_type_sizes[] = { 695 0, HCI_ACL_2DH1_SIZE, HCI_ACL_3DH1_SIZE, HCI_ACL_DM1_SIZE, 696 HCI_ACL_DH1_SIZE, 0, 0, 0, 697 HCI_ACL_2DH3_SIZE, HCI_ACL_3DH3_SIZE, HCI_ACL_DM3_SIZE, HCI_ACL_DH3_SIZE, 698 HCI_ACL_2DH5_SIZE, HCI_ACL_3DH5_SIZE, HCI_ACL_DM5_SIZE, HCI_ACL_DH5_SIZE 699 }; 700 static const uint8_t packet_type_feature_requirement_bit[] = { 701 0, // 3 slot packets 702 1, // 5 slot packets 703 25, // EDR 2 mpbs 704 26, // EDR 3 mbps 705 39, // 3 slot EDR packts 706 40, // 5 slot EDR packet 707 }; 708 static const uint16_t packet_type_feature_packet_mask[] = { 709 0x0f00, // 3 slot packets 710 0xf000, // 5 slot packets 711 0x1102, // EDR 2 mpbs 712 0x2204, // EDR 3 mbps 713 0x0300, // 3 slot EDR packts 714 0x3000, // 5 slot EDR packet 715 }; 716 717 static uint16_t hci_acl_packet_types_for_buffer_size_and_local_features(uint16_t buffer_size, uint8_t * local_supported_features){ 718 // enable packet types based on size 719 uint16_t packet_types = 0; 720 unsigned int i; 721 for (i=0;i<16;i++){ 722 if (packet_type_sizes[i] == 0) continue; 723 if (packet_type_sizes[i] <= buffer_size){ 724 packet_types |= 1 << i; 725 } 726 } 727 // disable packet types due to missing local supported features 728 for (i=0;i<sizeof(packet_type_feature_requirement_bit);i++){ 729 int bit_idx = packet_type_feature_requirement_bit[i]; 730 int feature_set = (local_supported_features[bit_idx >> 3] & (1<<(bit_idx & 7))) != 0; 731 if (feature_set) continue; 732 log_info("Features bit %02u is not set, removing packet types 0x%04x", bit_idx, packet_type_feature_packet_mask[i]); 733 packet_types &= ~packet_type_feature_packet_mask[i]; 734 } 735 // flip bits for "may not be used" 736 packet_types ^= 0x3306; 737 return packet_types; 738 } 739 740 uint16_t hci_usable_acl_packet_types(void){ 741 return hci_stack->packet_types; 742 } 743 744 uint8_t* hci_get_outgoing_packet_buffer(void){ 745 // hci packet buffer is >= acl data packet length 746 return hci_stack->hci_packet_buffer; 747 } 748 749 uint16_t hci_max_acl_data_packet_length(void){ 750 return hci_stack->acl_data_packet_length; 751 } 752 753 int hci_non_flushable_packet_boundary_flag_supported(void){ 754 // No. 54, byte 6, bit 6 755 return (hci_stack->local_supported_features[6] & (1 << 6)) != 0; 756 } 757 758 int hci_ssp_supported(void){ 759 // No. 51, byte 6, bit 3 760 return (hci_stack->local_supported_features[6] & (1 << 3)) != 0; 761 } 762 763 int hci_classic_supported(void){ 764 // No. 37, byte 4, bit 5, = No BR/EDR Support 765 return (hci_stack->local_supported_features[4] & (1 << 5)) == 0; 766 } 767 768 int hci_le_supported(void){ 769 #ifdef HAVE_BLE 770 // No. 37, byte 4, bit 6 = LE Supported (Controller) 771 return (hci_stack->local_supported_features[4] & (1 << 6)) != 0; 772 #else 773 return 0; 774 #endif 775 } 776 777 // get addr type and address used in advertisement packets 778 void hci_le_advertisement_address(uint8_t * addr_type, bd_addr_t addr){ 779 *addr_type = hci_stack->adv_addr_type; 780 if (hci_stack->adv_addr_type){ 781 memcpy(addr, hci_stack->adv_address, 6); 782 } else { 783 memcpy(addr, hci_stack->local_bd_addr, 6); 784 } 785 } 786 787 #ifdef HAVE_BLE 788 void le_handle_advertisement_report(uint8_t *packet, int size){ 789 int offset = 3; 790 int num_reports = packet[offset]; 791 offset += 1; 792 793 int i; 794 log_info("HCI: handle adv report with num reports: %d", num_reports); 795 uint8_t event[12 + LE_ADVERTISING_DATA_SIZE]; // use upper bound to avoid var size automatic var 796 for (i=0; i<num_reports;i++){ 797 uint8_t data_length = packet[offset + 8]; 798 uint8_t event_size = 10 + data_length; 799 int pos = 0; 800 event[pos++] = GAP_LE_ADVERTISING_REPORT; 801 event[pos++] = event_size; 802 memcpy(&event[pos], &packet[offset], 1+1+6); // event type + address type + address 803 offset += 8; 804 pos += 8; 805 event[pos++] = packet[offset + 1 + data_length]; // rssi 806 event[pos++] = packet[offset++]; //data_length; 807 memcpy(&event[pos], &packet[offset], data_length); 808 pos += data_length; 809 offset += data_length + 1; // rssi 810 hci_dump_packet( HCI_EVENT_PACKET, 0, event, pos); 811 hci_stack->packet_handler(HCI_EVENT_PACKET, event, pos); 812 } 813 } 814 #endif 815 816 static void hci_initializing_event_handler(uint8_t * packet, uint16_t size){ 817 uint8_t command_completed = 0; 818 if ((hci_stack->substate % 2) == 0) return; 819 // odd: waiting for event 820 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 821 uint16_t opcode = READ_BT_16(packet,3); 822 if (opcode == hci_stack->last_cmd_opcode){ 823 command_completed = 1; 824 log_info("Command complete for expected opcode %04x -> new substate %u", opcode, hci_stack->substate >> 1); 825 } else { 826 log_info("Command complete for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 827 } 828 } 829 if (packet[0] == HCI_EVENT_COMMAND_STATUS){ 830 uint8_t status = packet[2]; 831 uint16_t opcode = READ_BT_16(packet,4); 832 if (opcode == hci_stack->last_cmd_opcode){ 833 if (status){ 834 command_completed = 1; 835 log_error("Command status error 0x%02x for expected opcode %04x -> new substate %u", status, opcode, hci_stack->substate >> 1); 836 } else { 837 log_info("Command status OK for expected opcode %04x, waiting for command complete", opcode); 838 } 839 } else { 840 log_info("Command status for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 841 } 842 } 843 844 if (!command_completed) return; 845 846 switch(hci_stack->substate >> 1){ 847 default: 848 hci_stack->substate++; 849 break; 850 } 851 } 852 853 static void hci_initializing_state_machine(){ 854 if (hci_stack->substate % 2) { 855 // odd: waiting for command completion 856 return; 857 } 858 // log_info("hci_init: substate %u", hci_stack->substate >> 1); 859 switch (hci_stack->substate >> 1){ 860 case 0: // RESET 861 hci_state_reset(); 862 863 hci_send_cmd(&hci_reset); 864 if (hci_stack->config == NULL || ((hci_uart_config_t *)hci_stack->config)->baudrate_main == 0){ 865 // skip baud change 866 hci_stack->substate = 2 << 1; 867 } 868 break; 869 case 1: // SEND BAUD CHANGE 870 hci_stack->control->baudrate_cmd(hci_stack->config, ((hci_uart_config_t *)hci_stack->config)->baudrate_main, hci_stack->hci_packet_buffer); 871 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 872 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 873 break; 874 case 2: // LOCAL BAUD CHANGE 875 log_info("Local baud rate change"); 876 hci_stack->hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack->config)->baudrate_main); 877 hci_stack->substate += 2; 878 // break missing here for fall through 879 880 case 3: // SET BD ADDR 881 if ( hci_stack->custom_bd_addr_set && hci_stack->control && hci_stack->control->set_bd_addr_cmd){ 882 log_info("Set Public BD ADDR to %s", bd_addr_to_str(hci_stack->custom_bd_addr)); 883 hci_stack->control->set_bd_addr_cmd(hci_stack->config, hci_stack->custom_bd_addr, hci_stack->hci_packet_buffer); 884 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 885 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 886 break; 887 } 888 hci_stack->substate += 2; 889 // break missing here for fall through 890 891 case 4: 892 log_info("Custom init"); 893 // Custom initialization 894 if (hci_stack->control && hci_stack->control->next_cmd){ 895 int valid_cmd = (*hci_stack->control->next_cmd)(hci_stack->config, hci_stack->hci_packet_buffer); 896 if (valid_cmd){ 897 int size = 3 + hci_stack->hci_packet_buffer[2]; 898 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 899 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, hci_stack->hci_packet_buffer, size); 900 hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack->hci_packet_buffer, size); 901 hci_stack->substate = 3 << 1; // more init commands 902 break; 903 } 904 log_info("hci_run: init script done"); 905 } 906 // otherwise continue 907 hci_send_cmd(&hci_read_bd_addr); 908 break; 909 case 5: 910 hci_send_cmd(&hci_read_buffer_size); 911 break; 912 case 6: 913 hci_send_cmd(&hci_read_local_supported_features); 914 break; 915 case 7: 916 if (hci_le_supported()){ 917 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 918 } else { 919 // Kensington Bluetooth 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 920 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 921 } 922 923 // skip Classic init commands for LE only chipsets 924 if (!hci_classic_supported()){ 925 if (hci_le_supported()){ 926 hci_stack->substate = 12 << 1; // skip all classic command 927 } else { 928 log_error("Neither BR/EDR nor LE supported"); 929 hci_stack->substate = 15 << 1; // skip all 930 } 931 } 932 break; 933 case 8: 934 if (hci_ssp_supported()){ 935 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack->ssp_enable); 936 break; 937 } 938 hci_stack->substate += 2; 939 // break missing here for fall through 940 941 case 9: 942 // ca. 15 sec 943 hci_send_cmd(&hci_write_page_timeout, 0x6000); 944 break; 945 case 10: 946 hci_send_cmd(&hci_write_class_of_device, hci_stack->class_of_device); 947 break; 948 case 11: 949 if (hci_stack->local_name){ 950 hci_send_cmd(&hci_write_local_name, hci_stack->local_name); 951 } else { 952 char hostname[30]; 953 #ifdef EMBEDDED 954 // BTstack-11:22:33:44:55:66 955 strcpy(hostname, "BTstack "); 956 strcat(hostname, bd_addr_to_str(hci_stack->local_bd_addr)); 957 log_info("---> Name %s", hostname); 958 #else 959 // hostname for POSIX systems 960 gethostname(hostname, 30); 961 hostname[29] = '\0'; 962 #endif 963 hci_send_cmd(&hci_write_local_name, hostname); 964 } 965 break; 966 case 12: 967 hci_send_cmd(&hci_write_scan_enable, (hci_stack->connectable << 1) | hci_stack->discoverable); // page scan 968 if (!hci_le_supported()){ 969 // SKIP LE init for Classic only configuration 970 hci_stack->substate = 15 << 1; 971 } 972 break; 973 974 #ifdef HAVE_BLE 975 // LE INIT 976 case 13: 977 hci_send_cmd(&hci_le_read_buffer_size); 978 break; 979 case 14: 980 // LE Supported Host = 1, Simultaneous Host = 0 981 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 982 break; 983 case 15: 984 // LE Scan Parameters: active scanning, 300 ms interval, 30 ms window, public address, accept all advs 985 hci_send_cmd(&hci_le_set_scan_parameters, 1, 0x1e0, 0x30, 0, 0); 986 break; 987 #endif 988 989 // DONE 990 case 16: 991 // done. 992 hci_stack->state = HCI_STATE_WORKING; 993 hci_emit_state(); 994 break; 995 default: 996 break; 997 } 998 hci_stack->substate++; 999 } 1000 1001 // avoid huge local variables 1002 #ifndef EMBEDDED 1003 static device_name_t device_name; 1004 #endif 1005 static void event_handler(uint8_t *packet, int size){ 1006 1007 uint16_t event_length = packet[1]; 1008 1009 // assert packet is complete 1010 if (size != event_length + 2){ 1011 log_error("hci.c: event_handler called with event packet of wrong size %u, expected %u => dropping packet", size, event_length + 2); 1012 return; 1013 } 1014 1015 bd_addr_t addr; 1016 bd_addr_type_t addr_type; 1017 uint8_t link_type; 1018 hci_con_handle_t handle; 1019 hci_connection_t * conn; 1020 int i; 1021 1022 // log_info("HCI:EVENT:%02x", packet[0]); 1023 1024 switch (packet[0]) { 1025 1026 case HCI_EVENT_COMMAND_COMPLETE: 1027 // get num cmd packets 1028 // log_info("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u", hci_stack->num_cmd_packets, packet[2]); 1029 hci_stack->num_cmd_packets = packet[2]; 1030 1031 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 1032 // from offset 5 1033 // status 1034 // "The HC_ACL_Data_Packet_Length return parameter will be used to determine the size of the L2CAP segments contained in ACL Data Packets" 1035 hci_stack->acl_data_packet_length = READ_BT_16(packet, 6); 1036 hci_stack->sco_data_packet_length = packet[8]; 1037 hci_stack->acl_packets_total_num = READ_BT_16(packet, 9); 1038 hci_stack->sco_packets_total_num = READ_BT_16(packet, 11); 1039 1040 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1041 // determine usable ACL payload size 1042 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->acl_data_packet_length){ 1043 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1044 } 1045 log_info("hci_read_buffer_size: acl used size %u, count %u / sco size %u, count %u", 1046 hci_stack->acl_data_packet_length, hci_stack->acl_packets_total_num, 1047 hci_stack->sco_data_packet_length, hci_stack->sco_packets_total_num); 1048 } 1049 } 1050 #ifdef HAVE_BLE 1051 if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_buffer_size)){ 1052 hci_stack->le_data_packets_length = READ_BT_16(packet, 6); 1053 hci_stack->le_acl_packets_total_num = packet[8]; 1054 // determine usable ACL payload size 1055 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->le_data_packets_length){ 1056 hci_stack->le_data_packets_length = HCI_ACL_PAYLOAD_SIZE; 1057 } 1058 log_info("hci_le_read_buffer_size: size %u, count %u", hci_stack->le_data_packets_length, hci_stack->le_acl_packets_total_num); 1059 } 1060 #endif 1061 // Dump local address 1062 if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)) { 1063 bt_flip_addr(hci_stack->local_bd_addr, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1]); 1064 log_info("Local Address, Status: 0x%02x: Addr: %s", 1065 packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE], bd_addr_to_str(hci_stack->local_bd_addr)); 1066 } 1067 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1068 hci_emit_discoverable_enabled(hci_stack->discoverable); 1069 } 1070 // Note: HCI init checks 1071 if (COMMAND_COMPLETE_EVENT(packet, hci_read_local_supported_features)){ 1072 memcpy(hci_stack->local_supported_features, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1], 8); 1073 log_info("Local Supported Features: 0x%02x%02x%02x%02x%02x%02x%02x%02x", 1074 hci_stack->local_supported_features[0], hci_stack->local_supported_features[1], 1075 hci_stack->local_supported_features[2], hci_stack->local_supported_features[3], 1076 hci_stack->local_supported_features[4], hci_stack->local_supported_features[5], 1077 hci_stack->local_supported_features[6], hci_stack->local_supported_features[7]); 1078 1079 // determine usable ACL packet types based on host buffer size and supported features 1080 hci_stack->packet_types = hci_acl_packet_types_for_buffer_size_and_local_features(HCI_ACL_PAYLOAD_SIZE, &hci_stack->local_supported_features[0]); 1081 log_info("packet types %04x", hci_stack->packet_types); 1082 1083 // Classic/LE 1084 log_info("BR/EDR support %u, LE support %u", hci_classic_supported(), hci_le_supported()); 1085 } 1086 break; 1087 1088 case HCI_EVENT_COMMAND_STATUS: 1089 // get num cmd packets 1090 // log_info("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u", hci_stack->num_cmd_packets, packet[3]); 1091 hci_stack->num_cmd_packets = packet[3]; 1092 break; 1093 1094 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:{ 1095 int offset = 3; 1096 for (i=0; i<packet[2];i++){ 1097 handle = READ_BT_16(packet, offset); 1098 offset += 2; 1099 uint16_t num_packets = READ_BT_16(packet, offset); 1100 offset += 2; 1101 1102 conn = hci_connection_for_handle(handle); 1103 if (!conn){ 1104 log_error("hci_number_completed_packet lists unused con handle %u", handle); 1105 continue; 1106 } 1107 1108 if (conn->address_type == BD_ADDR_TYPE_SCO){ 1109 if (conn->num_sco_packets_sent >= num_packets){ 1110 conn->num_sco_packets_sent -= num_packets; 1111 } else { 1112 log_error("hci_number_completed_packets, more sco slots freed then sent."); 1113 conn->num_sco_packets_sent = 0; 1114 } 1115 1116 } else { 1117 if (conn->num_acl_packets_sent >= num_packets){ 1118 conn->num_acl_packets_sent -= num_packets; 1119 } else { 1120 log_error("hci_number_completed_packets, more acl slots freed then sent."); 1121 conn->num_acl_packets_sent = 0; 1122 } 1123 } 1124 // log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u", num_packets, handle, conn->num_acl_packets_sent); 1125 } 1126 break; 1127 } 1128 case HCI_EVENT_CONNECTION_REQUEST: 1129 bt_flip_addr(addr, &packet[2]); 1130 // TODO: eval COD 8-10 1131 link_type = packet[11]; 1132 log_info("Connection_incoming: %s, type %u", bd_addr_to_str(addr), link_type); 1133 addr_type = link_type == 1 ? BD_ADDR_TYPE_CLASSIC : BD_ADDR_TYPE_SCO; 1134 conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 1135 if (!conn) { 1136 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 1137 } 1138 if (!conn) { 1139 // CONNECTION REJECTED DUE TO LIMITED RESOURCES (0X0D) 1140 hci_stack->decline_reason = 0x0d; 1141 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1142 break; 1143 } 1144 conn->state = RECEIVED_CONNECTION_REQUEST; 1145 hci_run(); 1146 break; 1147 1148 case HCI_EVENT_CONNECTION_COMPLETE: 1149 // Connection management 1150 bt_flip_addr(addr, &packet[5]); 1151 log_info("Connection_complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 1152 addr_type = BD_ADDR_TYPE_CLASSIC; 1153 conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 1154 if (conn) { 1155 if (!packet[2]){ 1156 conn->state = OPEN; 1157 conn->con_handle = READ_BT_16(packet, 3); 1158 conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES; 1159 1160 // restart timer 1161 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1162 run_loop_add_timer(&conn->timeout); 1163 1164 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1165 1166 hci_emit_nr_connections_changed(); 1167 } else { 1168 int notify_dedicated_bonding_failed = conn->bonding_flags & BONDING_DEDICATED; 1169 uint8_t status = packet[2]; 1170 bd_addr_t bd_address; 1171 memcpy(&bd_address, conn->address, 6); 1172 1173 // connection failed, remove entry 1174 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1175 btstack_memory_hci_connection_free( conn ); 1176 1177 // notify client if dedicated bonding 1178 if (notify_dedicated_bonding_failed){ 1179 log_info("hci notify_dedicated_bonding_failed"); 1180 hci_emit_dedicated_bonding_result(bd_address, status); 1181 } 1182 1183 // if authentication error, also delete link key 1184 if (packet[2] == 0x05) { 1185 hci_drop_link_key_for_bd_addr(addr); 1186 } 1187 } 1188 } 1189 break; 1190 1191 case HCI_EVENT_SYNCHRONOUS_CONNECTION_COMPLETE: 1192 bt_flip_addr(addr, &packet[5]); 1193 log_info("Synchronous Connection Complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 1194 if (packet[2]){ 1195 // connection failed 1196 break; 1197 } 1198 conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_SCO); 1199 if (!conn) { 1200 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_SCO); 1201 } 1202 if (!conn) { 1203 break; 1204 } 1205 conn->state = OPEN; 1206 conn->con_handle = READ_BT_16(packet, 3); 1207 break; 1208 1209 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 1210 handle = READ_BT_16(packet, 3); 1211 conn = hci_connection_for_handle(handle); 1212 if (!conn) break; 1213 if (!packet[2]){ 1214 uint8_t * features = &packet[5]; 1215 if (features[6] & (1 << 3)){ 1216 conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP; 1217 } 1218 } 1219 conn->bonding_flags |= BONDING_RECEIVED_REMOTE_FEATURES; 1220 log_info("HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE, bonding flags %x", conn->bonding_flags); 1221 if (conn->bonding_flags & BONDING_DEDICATED){ 1222 conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 1223 } 1224 break; 1225 1226 case HCI_EVENT_LINK_KEY_REQUEST: 1227 log_info("HCI_EVENT_LINK_KEY_REQUEST"); 1228 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 1229 // non-bondable mode: link key negative reply will be sent by HANDLE_LINK_KEY_REQUEST 1230 if (hci_stack->bondable && !hci_stack->remote_device_db) break; 1231 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], HANDLE_LINK_KEY_REQUEST); 1232 hci_run(); 1233 // request handled by hci_run() as HANDLE_LINK_KEY_REQUEST gets set 1234 return; 1235 1236 case HCI_EVENT_LINK_KEY_NOTIFICATION: { 1237 bt_flip_addr(addr, &packet[2]); 1238 conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 1239 if (!conn) break; 1240 conn->authentication_flags |= RECV_LINK_KEY_NOTIFICATION; 1241 link_key_type_t link_key_type = (link_key_type_t)packet[24]; 1242 // Change Connection Encryption keeps link key type 1243 if (link_key_type != CHANGED_COMBINATION_KEY){ 1244 conn->link_key_type = link_key_type; 1245 } 1246 if (!hci_stack->remote_device_db) break; 1247 hci_stack->remote_device_db->put_link_key(addr, &packet[8], conn->link_key_type); 1248 // still forward event to allow dismiss of pairing dialog 1249 break; 1250 } 1251 1252 case HCI_EVENT_PIN_CODE_REQUEST: 1253 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], LEGACY_PAIRING_ACTIVE); 1254 // non-bondable mode: pin code negative reply will be sent 1255 if (!hci_stack->bondable){ 1256 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], DENY_PIN_CODE_REQUEST); 1257 hci_run(); 1258 return; 1259 } 1260 // PIN CODE REQUEST means the link key request didn't succee -> delete stored link key 1261 if (!hci_stack->remote_device_db) break; 1262 bt_flip_addr(addr, &packet[2]); 1263 hci_stack->remote_device_db->delete_link_key(addr); 1264 break; 1265 1266 case HCI_EVENT_IO_CAPABILITY_REQUEST: 1267 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_IO_CAPABILITIES_REQUEST); 1268 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_IO_CAPABILITIES_REPLY); 1269 break; 1270 1271 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 1272 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1273 if (!hci_stack->ssp_auto_accept) break; 1274 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_CONFIRM_REPLY); 1275 break; 1276 1277 case HCI_EVENT_USER_PASSKEY_REQUEST: 1278 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1279 if (!hci_stack->ssp_auto_accept) break; 1280 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_PASSKEY_REPLY); 1281 break; 1282 1283 case HCI_EVENT_ENCRYPTION_CHANGE: 1284 handle = READ_BT_16(packet, 3); 1285 conn = hci_connection_for_handle(handle); 1286 if (!conn) break; 1287 if (packet[2] == 0) { 1288 if (packet[5]){ 1289 conn->authentication_flags |= CONNECTION_ENCRYPTED; 1290 } else { 1291 conn->authentication_flags &= ~CONNECTION_ENCRYPTED; 1292 } 1293 } 1294 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1295 break; 1296 1297 case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT: 1298 handle = READ_BT_16(packet, 3); 1299 conn = hci_connection_for_handle(handle); 1300 if (!conn) break; 1301 1302 // dedicated bonding: send result and disconnect 1303 if (conn->bonding_flags & BONDING_DEDICATED){ 1304 conn->bonding_flags &= ~BONDING_DEDICATED; 1305 conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE; 1306 conn->bonding_status = packet[2]; 1307 break; 1308 } 1309 1310 if (packet[2] == 0 && gap_security_level_for_link_key_type(conn->link_key_type) >= conn->requested_security_level){ 1311 // link key sufficient for requested security 1312 conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 1313 break; 1314 } 1315 // not enough 1316 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1317 break; 1318 1319 #ifndef EMBEDDED 1320 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 1321 if (!hci_stack->remote_device_db) break; 1322 if (packet[2]) break; // status not ok 1323 bt_flip_addr(addr, &packet[3]); 1324 // fix for invalid remote names - terminate on 0xff 1325 for (i=0; i<248;i++){ 1326 if (packet[9+i] == 0xff){ 1327 packet[9+i] = 0; 1328 break; 1329 } 1330 } 1331 memset(&device_name, 0, sizeof(device_name_t)); 1332 strncpy((char*) device_name, (char*) &packet[9], 248); 1333 hci_stack->remote_device_db->put_name(addr, &device_name); 1334 break; 1335 1336 case HCI_EVENT_INQUIRY_RESULT: 1337 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:{ 1338 if (!hci_stack->remote_device_db) break; 1339 // first send inq result packet 1340 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1341 // then send cached remote names 1342 int offset = 3; 1343 for (i=0; i<packet[2];i++){ 1344 bt_flip_addr(addr, &packet[offset]); 1345 offset += 14; // 6 + 1 + 1 + 1 + 3 + 2; 1346 if (hci_stack->remote_device_db->get_name(addr, &device_name)){ 1347 hci_emit_remote_name_cached(addr, &device_name); 1348 } 1349 } 1350 return; 1351 } 1352 #endif 1353 1354 // HCI_EVENT_DISCONNECTION_COMPLETE 1355 // has been split, to first notify stack before shutting connection down 1356 // see end of function, too. 1357 case HCI_EVENT_DISCONNECTION_COMPLETE: 1358 if (packet[2]) break; // status != 0 1359 handle = READ_BT_16(packet, 3); 1360 hci_connection_t * conn = hci_connection_for_handle(handle); 1361 if (!conn) break; // no conn struct anymore 1362 conn->state = RECEIVED_DISCONNECTION_COMPLETE; 1363 break; 1364 1365 case HCI_EVENT_HARDWARE_ERROR: 1366 if(hci_stack->control && hci_stack->control->hw_error){ 1367 (*hci_stack->control->hw_error)(); 1368 } else { 1369 // if no special requests, just reboot stack 1370 hci_power_control_off(); 1371 hci_power_control_on(); 1372 } 1373 break; 1374 1375 case DAEMON_EVENT_HCI_PACKET_SENT: 1376 // release packet buffer only for asynchronous transport and if there are not further fragements 1377 if (hci_transport_synchronous()) { 1378 log_error("Synchronous HCI Transport shouldn't send DAEMON_EVENT_HCI_PACKET_SENT"); 1379 return; // instead of break: to avoid re-entering hci_run() 1380 } 1381 if (hci_stack->acl_fragmentation_total_size) break; 1382 hci_release_packet_buffer(); 1383 break; 1384 1385 #ifdef HAVE_BLE 1386 case HCI_EVENT_LE_META: 1387 switch (packet[2]){ 1388 case HCI_SUBEVENT_LE_ADVERTISING_REPORT: 1389 log_info("advertising report received"); 1390 if (hci_stack->le_scanning_state != LE_SCANNING) break; 1391 le_handle_advertisement_report(packet, size); 1392 break; 1393 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 1394 // Connection management 1395 bt_flip_addr(addr, &packet[8]); 1396 addr_type = (bd_addr_type_t)packet[7]; 1397 log_info("LE Connection_complete (status=%u) type %u, %s", packet[3], addr_type, bd_addr_to_str(addr)); 1398 // LE connections are auto-accepted, so just create a connection if there isn't one already 1399 conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 1400 if (packet[3]){ 1401 if (conn){ 1402 // outgoing connection failed, remove entry 1403 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1404 btstack_memory_hci_connection_free( conn ); 1405 } 1406 // if authentication error, also delete link key 1407 if (packet[3] == 0x05) { 1408 hci_drop_link_key_for_bd_addr(addr); 1409 } 1410 break; 1411 } 1412 if (!conn){ 1413 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 1414 } 1415 if (!conn){ 1416 // no memory 1417 break; 1418 } 1419 1420 conn->state = OPEN; 1421 conn->con_handle = READ_BT_16(packet, 4); 1422 1423 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 1424 1425 // restart timer 1426 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1427 // run_loop_add_timer(&conn->timeout); 1428 1429 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1430 1431 hci_emit_nr_connections_changed(); 1432 break; 1433 1434 // log_info("LE buffer size: %u, count %u", READ_BT_16(packet,6), packet[8]); 1435 1436 default: 1437 break; 1438 } 1439 break; 1440 #endif 1441 default: 1442 break; 1443 } 1444 1445 // handle BT initialization 1446 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1447 hci_initializing_event_handler(packet, size); 1448 } 1449 1450 // help with BT sleep 1451 if (hci_stack->state == HCI_STATE_FALLING_ASLEEP 1452 && hci_stack->substate == 1 1453 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1454 hci_stack->substate++; 1455 } 1456 1457 // notify upper stack 1458 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1459 1460 // moved here to give upper stack a chance to close down everything with hci_connection_t intact 1461 if (packet[0] == HCI_EVENT_DISCONNECTION_COMPLETE){ 1462 if (!packet[2]){ 1463 handle = READ_BT_16(packet, 3); 1464 hci_connection_t * conn = hci_connection_for_handle(handle); 1465 if (conn) { 1466 uint8_t status = conn->bonding_status; 1467 uint16_t flags = conn->bonding_flags; 1468 bd_addr_t bd_address; 1469 memcpy(&bd_address, conn->address, 6); 1470 hci_shutdown_connection(conn); 1471 // connection struct is gone, don't access anymore 1472 if (flags & BONDING_EMIT_COMPLETE_ON_DISCONNECT){ 1473 hci_emit_dedicated_bonding_result(bd_address, status); 1474 } 1475 } 1476 } 1477 } 1478 1479 // execute main loop 1480 hci_run(); 1481 } 1482 1483 static void sco_handler(uint8_t * packet, uint16_t size){ 1484 // not handled yet 1485 } 1486 1487 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1488 hci_dump_packet(packet_type, 1, packet, size); 1489 switch (packet_type) { 1490 case HCI_EVENT_PACKET: 1491 event_handler(packet, size); 1492 break; 1493 case HCI_ACL_DATA_PACKET: 1494 acl_handler(packet, size); 1495 break; 1496 case HCI_SCO_DATA_PACKET: 1497 sco_handler(packet, size); 1498 default: 1499 break; 1500 } 1501 } 1502 1503 /** Register HCI packet handlers */ 1504 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 1505 hci_stack->packet_handler = handler; 1506 } 1507 1508 static void hci_state_reset(){ 1509 // no connections yet 1510 hci_stack->connections = NULL; 1511 1512 // keep discoverable/connectable as this has been requested by the client(s) 1513 // hci_stack->discoverable = 0; 1514 // hci_stack->connectable = 0; 1515 // hci_stack->bondable = 1; 1516 1517 // buffer is free 1518 hci_stack->hci_packet_buffer_reserved = 0; 1519 1520 // no pending cmds 1521 hci_stack->decline_reason = 0; 1522 hci_stack->new_scan_enable_value = 0xff; 1523 1524 // LE 1525 hci_stack->adv_addr_type = 0; 1526 memset(hci_stack->adv_address, 0, 6); 1527 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1528 hci_stack->le_scan_type = 0xff; 1529 hci_stack->le_connection_parameter_range.le_conn_interval_min = 0x0006; 1530 hci_stack->le_connection_parameter_range.le_conn_interval_max = 0x0C80; 1531 hci_stack->le_connection_parameter_range.le_conn_latency_min = 0x0000; 1532 hci_stack->le_connection_parameter_range.le_conn_latency_max = 0x03E8; 1533 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = 0x000A; 1534 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = 0x0C80; 1535 } 1536 1537 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 1538 1539 #ifdef HAVE_MALLOC 1540 if (!hci_stack) { 1541 hci_stack = (hci_stack_t*) malloc(sizeof(hci_stack_t)); 1542 } 1543 #else 1544 hci_stack = &hci_stack_static; 1545 #endif 1546 memset(hci_stack, 0, sizeof(hci_stack_t)); 1547 1548 // reference to use transport layer implementation 1549 hci_stack->hci_transport = transport; 1550 1551 // references to used control implementation 1552 hci_stack->control = control; 1553 1554 // reference to used config 1555 hci_stack->config = config; 1556 1557 // higher level handler 1558 hci_stack->packet_handler = dummy_handler; 1559 1560 // store and open remote device db 1561 hci_stack->remote_device_db = remote_device_db; 1562 if (hci_stack->remote_device_db) { 1563 hci_stack->remote_device_db->open(); 1564 } 1565 1566 // max acl payload size defined in config.h 1567 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1568 1569 // register packet handlers with transport 1570 transport->register_packet_handler(&packet_handler); 1571 1572 hci_stack->state = HCI_STATE_OFF; 1573 1574 // class of device 1575 hci_stack->class_of_device = 0x007a020c; // Smartphone 1576 1577 // bondable by default 1578 hci_stack->bondable = 1; 1579 1580 // Secure Simple Pairing default: enable, no I/O capabilities, general bonding, mitm not required, auto accept 1581 hci_stack->ssp_enable = 1; 1582 hci_stack->ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 1583 hci_stack->ssp_authentication_requirement = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING; 1584 hci_stack->ssp_auto_accept = 1; 1585 1586 hci_state_reset(); 1587 } 1588 1589 void hci_close(){ 1590 // close remote device db 1591 if (hci_stack->remote_device_db) { 1592 hci_stack->remote_device_db->close(); 1593 } 1594 while (hci_stack->connections) { 1595 // cancel all l2cap connections 1596 hci_emit_disconnection_complete(((hci_connection_t *) hci_stack->connections)->con_handle, 0x16); // terminated by local host 1597 hci_shutdown_connection((hci_connection_t *) hci_stack->connections); 1598 } 1599 hci_power_control(HCI_POWER_OFF); 1600 1601 #ifdef HAVE_MALLOC 1602 free(hci_stack); 1603 #endif 1604 hci_stack = NULL; 1605 } 1606 1607 void hci_set_class_of_device(uint32_t class_of_device){ 1608 hci_stack->class_of_device = class_of_device; 1609 } 1610 1611 // Set Public BD ADDR - passed on to Bluetooth chipset if supported in bt_control_h 1612 void hci_set_bd_addr(bd_addr_t addr){ 1613 memcpy(hci_stack->custom_bd_addr, addr, 6); 1614 hci_stack->custom_bd_addr_set = 1; 1615 } 1616 1617 void hci_disable_l2cap_timeout_check(){ 1618 disable_l2cap_timeouts = 1; 1619 } 1620 // State-Module-Driver overview 1621 // state module low-level 1622 // HCI_STATE_OFF off close 1623 // HCI_STATE_INITIALIZING, on open 1624 // HCI_STATE_WORKING, on open 1625 // HCI_STATE_HALTING, on open 1626 // HCI_STATE_SLEEPING, off/sleep close 1627 // HCI_STATE_FALLING_ASLEEP on open 1628 1629 static int hci_power_control_on(void){ 1630 1631 // power on 1632 int err = 0; 1633 if (hci_stack->control && hci_stack->control->on){ 1634 err = (*hci_stack->control->on)(hci_stack->config); 1635 } 1636 if (err){ 1637 log_error( "POWER_ON failed"); 1638 hci_emit_hci_open_failed(); 1639 return err; 1640 } 1641 1642 // open low-level device 1643 err = hci_stack->hci_transport->open(hci_stack->config); 1644 if (err){ 1645 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1646 if (hci_stack->control && hci_stack->control->off){ 1647 (*hci_stack->control->off)(hci_stack->config); 1648 } 1649 hci_emit_hci_open_failed(); 1650 return err; 1651 } 1652 return 0; 1653 } 1654 1655 static void hci_power_control_off(void){ 1656 1657 log_info("hci_power_control_off"); 1658 1659 // close low-level device 1660 hci_stack->hci_transport->close(hci_stack->config); 1661 1662 log_info("hci_power_control_off - hci_transport closed"); 1663 1664 // power off 1665 if (hci_stack->control && hci_stack->control->off){ 1666 (*hci_stack->control->off)(hci_stack->config); 1667 } 1668 1669 log_info("hci_power_control_off - control closed"); 1670 1671 hci_stack->state = HCI_STATE_OFF; 1672 } 1673 1674 static void hci_power_control_sleep(void){ 1675 1676 log_info("hci_power_control_sleep"); 1677 1678 #if 0 1679 // don't close serial port during sleep 1680 1681 // close low-level device 1682 hci_stack->hci_transport->close(hci_stack->config); 1683 #endif 1684 1685 // sleep mode 1686 if (hci_stack->control && hci_stack->control->sleep){ 1687 (*hci_stack->control->sleep)(hci_stack->config); 1688 } 1689 1690 hci_stack->state = HCI_STATE_SLEEPING; 1691 } 1692 1693 static int hci_power_control_wake(void){ 1694 1695 log_info("hci_power_control_wake"); 1696 1697 // wake on 1698 if (hci_stack->control && hci_stack->control->wake){ 1699 (*hci_stack->control->wake)(hci_stack->config); 1700 } 1701 1702 #if 0 1703 // open low-level device 1704 int err = hci_stack->hci_transport->open(hci_stack->config); 1705 if (err){ 1706 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1707 if (hci_stack->control && hci_stack->control->off){ 1708 (*hci_stack->control->off)(hci_stack->config); 1709 } 1710 hci_emit_hci_open_failed(); 1711 return err; 1712 } 1713 #endif 1714 1715 return 0; 1716 } 1717 1718 static void hci_power_transition_to_initializing(void){ 1719 // set up state machine 1720 hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent 1721 hci_stack->hci_packet_buffer_reserved = 0; 1722 hci_stack->state = HCI_STATE_INITIALIZING; 1723 hci_stack->substate = 0; 1724 } 1725 1726 int hci_power_control(HCI_POWER_MODE power_mode){ 1727 1728 log_info("hci_power_control: %u, current mode %u", power_mode, hci_stack->state); 1729 1730 int err = 0; 1731 switch (hci_stack->state){ 1732 1733 case HCI_STATE_OFF: 1734 switch (power_mode){ 1735 case HCI_POWER_ON: 1736 err = hci_power_control_on(); 1737 if (err) { 1738 log_error("hci_power_control_on() error %u", err); 1739 return err; 1740 } 1741 hci_power_transition_to_initializing(); 1742 break; 1743 case HCI_POWER_OFF: 1744 // do nothing 1745 break; 1746 case HCI_POWER_SLEEP: 1747 // do nothing (with SLEEP == OFF) 1748 break; 1749 } 1750 break; 1751 1752 case HCI_STATE_INITIALIZING: 1753 switch (power_mode){ 1754 case HCI_POWER_ON: 1755 // do nothing 1756 break; 1757 case HCI_POWER_OFF: 1758 // no connections yet, just turn it off 1759 hci_power_control_off(); 1760 break; 1761 case HCI_POWER_SLEEP: 1762 // no connections yet, just turn it off 1763 hci_power_control_sleep(); 1764 break; 1765 } 1766 break; 1767 1768 case HCI_STATE_WORKING: 1769 switch (power_mode){ 1770 case HCI_POWER_ON: 1771 // do nothing 1772 break; 1773 case HCI_POWER_OFF: 1774 // see hci_run 1775 hci_stack->state = HCI_STATE_HALTING; 1776 break; 1777 case HCI_POWER_SLEEP: 1778 // see hci_run 1779 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1780 hci_stack->substate = 0; 1781 break; 1782 } 1783 break; 1784 1785 case HCI_STATE_HALTING: 1786 switch (power_mode){ 1787 case HCI_POWER_ON: 1788 hci_power_transition_to_initializing(); 1789 break; 1790 case HCI_POWER_OFF: 1791 // do nothing 1792 break; 1793 case HCI_POWER_SLEEP: 1794 // see hci_run 1795 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1796 hci_stack->substate = 0; 1797 break; 1798 } 1799 break; 1800 1801 case HCI_STATE_FALLING_ASLEEP: 1802 switch (power_mode){ 1803 case HCI_POWER_ON: 1804 1805 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1806 // nothing to do, if H4 supports power management 1807 if (bt_control_iphone_power_management_enabled()){ 1808 hci_stack->state = HCI_STATE_INITIALIZING; 1809 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1810 break; 1811 } 1812 #endif 1813 hci_power_transition_to_initializing(); 1814 break; 1815 case HCI_POWER_OFF: 1816 // see hci_run 1817 hci_stack->state = HCI_STATE_HALTING; 1818 break; 1819 case HCI_POWER_SLEEP: 1820 // do nothing 1821 break; 1822 } 1823 break; 1824 1825 case HCI_STATE_SLEEPING: 1826 switch (power_mode){ 1827 case HCI_POWER_ON: 1828 1829 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1830 // nothing to do, if H4 supports power management 1831 if (bt_control_iphone_power_management_enabled()){ 1832 hci_stack->state = HCI_STATE_INITIALIZING; 1833 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1834 hci_update_scan_enable(); 1835 break; 1836 } 1837 #endif 1838 err = hci_power_control_wake(); 1839 if (err) return err; 1840 hci_power_transition_to_initializing(); 1841 break; 1842 case HCI_POWER_OFF: 1843 hci_stack->state = HCI_STATE_HALTING; 1844 break; 1845 case HCI_POWER_SLEEP: 1846 // do nothing 1847 break; 1848 } 1849 break; 1850 } 1851 1852 // create internal event 1853 hci_emit_state(); 1854 1855 // trigger next/first action 1856 hci_run(); 1857 1858 return 0; 1859 } 1860 1861 static void hci_update_scan_enable(void){ 1862 // 2 = page scan, 1 = inq scan 1863 hci_stack->new_scan_enable_value = hci_stack->connectable << 1 | hci_stack->discoverable; 1864 hci_run(); 1865 } 1866 1867 void hci_discoverable_control(uint8_t enable){ 1868 if (enable) enable = 1; // normalize argument 1869 1870 if (hci_stack->discoverable == enable){ 1871 hci_emit_discoverable_enabled(hci_stack->discoverable); 1872 return; 1873 } 1874 1875 hci_stack->discoverable = enable; 1876 hci_update_scan_enable(); 1877 } 1878 1879 void hci_connectable_control(uint8_t enable){ 1880 if (enable) enable = 1; // normalize argument 1881 1882 // don't emit event 1883 if (hci_stack->connectable == enable) return; 1884 1885 hci_stack->connectable = enable; 1886 hci_update_scan_enable(); 1887 } 1888 1889 void hci_local_bd_addr(bd_addr_t address_buffer){ 1890 memcpy(address_buffer, hci_stack->local_bd_addr, 6); 1891 } 1892 1893 void hci_run(){ 1894 1895 hci_connection_t * connection; 1896 linked_item_t * it; 1897 1898 // send continuation fragments first, as they block the prepared packet buffer 1899 if (hci_stack->acl_fragmentation_total_size > 0) { 1900 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(hci_stack->hci_packet_buffer); 1901 if (hci_can_send_prepared_acl_packet_now(con_handle)){ 1902 hci_connection_t *connection = hci_connection_for_handle(con_handle); 1903 if (connection) { 1904 hci_send_acl_packet_fragments(connection); 1905 return; 1906 } 1907 // connection gone -> discard further fragments 1908 hci_stack->acl_fragmentation_total_size = 0; 1909 hci_stack->acl_fragmentation_pos = 0; 1910 } 1911 } 1912 1913 if (!hci_can_send_command_packet_now()) return; 1914 1915 // global/non-connection oriented commands 1916 1917 // decline incoming connections 1918 if (hci_stack->decline_reason){ 1919 uint8_t reason = hci_stack->decline_reason; 1920 hci_stack->decline_reason = 0; 1921 hci_send_cmd(&hci_reject_connection_request, hci_stack->decline_addr, reason); 1922 return; 1923 } 1924 1925 // send scan enable 1926 if (hci_stack->state == HCI_STATE_WORKING && hci_stack->new_scan_enable_value != 0xff && hci_classic_supported()){ 1927 hci_send_cmd(&hci_write_scan_enable, hci_stack->new_scan_enable_value); 1928 hci_stack->new_scan_enable_value = 0xff; 1929 return; 1930 } 1931 1932 #ifdef HAVE_BLE 1933 // handle le scan 1934 if (hci_stack->state == HCI_STATE_WORKING){ 1935 switch(hci_stack->le_scanning_state){ 1936 case LE_START_SCAN: 1937 hci_stack->le_scanning_state = LE_SCANNING; 1938 hci_send_cmd(&hci_le_set_scan_enable, 1, 0); 1939 return; 1940 1941 case LE_STOP_SCAN: 1942 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1943 hci_send_cmd(&hci_le_set_scan_enable, 0, 0); 1944 return; 1945 default: 1946 break; 1947 } 1948 if (hci_stack->le_scan_type != 0xff){ 1949 // defaults: active scanning, accept all advertisement packets 1950 int scan_type = hci_stack->le_scan_type; 1951 hci_stack->le_scan_type = 0xff; 1952 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); 1953 return; 1954 } 1955 } 1956 #endif 1957 1958 // send pending HCI commands 1959 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 1960 connection = (hci_connection_t *) it; 1961 1962 switch(connection->state){ 1963 case SEND_CREATE_CONNECTION: 1964 switch(connection->address_type){ 1965 case BD_ADDR_TYPE_CLASSIC: 1966 log_info("sending hci_create_connection"); 1967 hci_send_cmd(&hci_create_connection, connection->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 1968 break; 1969 default: 1970 #ifdef HAVE_BLE 1971 log_info("sending hci_le_create_connection"); 1972 hci_send_cmd(&hci_le_create_connection, 1973 0x0060, // scan interval: 60 ms 1974 0x0030, // scan interval: 30 ms 1975 0, // don't use whitelist 1976 connection->address_type, // peer address type 1977 connection->address, // peer bd addr 1978 hci_stack->adv_addr_type, // our addr type: 1979 0x0008, // conn interval min 1980 0x0018, // conn interval max 1981 0, // conn latency 1982 0x0048, // supervision timeout 1983 0x0001, // min ce length 1984 0x0001 // max ce length 1985 ); 1986 1987 connection->state = SENT_CREATE_CONNECTION; 1988 #endif 1989 break; 1990 } 1991 return; 1992 1993 case RECEIVED_CONNECTION_REQUEST: 1994 log_info("sending hci_accept_connection_request"); 1995 connection->state = ACCEPTED_CONNECTION_REQUEST; 1996 if (connection->address_type == BD_ADDR_TYPE_CLASSIC){ 1997 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 1998 } else { 1999 // TODO: allows to customize synchronous connection parameters 2000 hci_send_cmd(&hci_accept_synchronous_connection_command, connection->address, 8000, 8000, 0xFFFF, 0x0060, 0xFF, 0x003F); 2001 } 2002 return; 2003 2004 #ifdef HAVE_BLE 2005 case SEND_CANCEL_CONNECTION: 2006 connection->state = SENT_CANCEL_CONNECTION; 2007 hci_send_cmd(&hci_le_create_connection_cancel); 2008 return; 2009 #endif 2010 case SEND_DISCONNECT: 2011 connection->state = SENT_DISCONNECT; 2012 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2013 return; 2014 2015 default: 2016 break; 2017 } 2018 2019 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 2020 log_info("responding to link key request"); 2021 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 2022 link_key_t link_key; 2023 link_key_type_t link_key_type; 2024 if ( hci_stack->remote_device_db 2025 && hci_stack->remote_device_db->get_link_key(connection->address, link_key, &link_key_type) 2026 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 2027 connection->link_key_type = link_key_type; 2028 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 2029 } else { 2030 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 2031 } 2032 return; 2033 } 2034 2035 if (connection->authentication_flags & DENY_PIN_CODE_REQUEST){ 2036 log_info("denying to pin request"); 2037 connectionClearAuthenticationFlags(connection, DENY_PIN_CODE_REQUEST); 2038 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 2039 return; 2040 } 2041 2042 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 2043 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 2044 log_info("IO Capability Request received, stack bondable %u, io cap %u", hci_stack->bondable, hci_stack->ssp_io_capability); 2045 if (hci_stack->bondable && (hci_stack->ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN)){ 2046 // tweak authentication requirements 2047 uint8_t authreq = hci_stack->ssp_authentication_requirement; 2048 if (connection->bonding_flags & BONDING_DEDICATED){ 2049 authreq = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING; 2050 } 2051 if (gap_mitm_protection_required_for_security_level(connection->requested_security_level)){ 2052 authreq |= 1; 2053 } 2054 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack->ssp_io_capability, NULL, authreq); 2055 } else { 2056 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 2057 } 2058 return; 2059 } 2060 2061 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 2062 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 2063 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 2064 return; 2065 } 2066 2067 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 2068 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 2069 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 2070 return; 2071 } 2072 2073 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 2074 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 2075 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 2076 return; 2077 } 2078 2079 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 2080 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 2081 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 2082 return; 2083 } 2084 if (connection->bonding_flags & BONDING_DISCONNECT_DEDICATED_DONE){ 2085 connection->bonding_flags &= ~BONDING_DISCONNECT_DEDICATED_DONE; 2086 connection->bonding_flags |= BONDING_EMIT_COMPLETE_ON_DISCONNECT; 2087 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // authentication done 2088 return; 2089 } 2090 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 2091 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 2092 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 2093 return; 2094 } 2095 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 2096 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 2097 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 2098 return; 2099 } 2100 2101 #ifdef HAVE_BLE 2102 if (connection->le_con_parameter_update_state == CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS){ 2103 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 2104 2105 uint16_t connection_interval_min = connection->le_conn_interval_min; 2106 connection->le_conn_interval_min = 0; 2107 hci_send_cmd(&hci_le_connection_update, connection->con_handle, connection_interval_min, 2108 connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout, 2109 0x0000, 0xffff); 2110 } 2111 #endif 2112 } 2113 2114 switch (hci_stack->state){ 2115 case HCI_STATE_INITIALIZING: 2116 hci_initializing_state_machine(); 2117 break; 2118 2119 case HCI_STATE_HALTING: 2120 2121 log_info("HCI_STATE_HALTING"); 2122 // close all open connections 2123 connection = (hci_connection_t *) hci_stack->connections; 2124 if (connection){ 2125 2126 // send disconnect 2127 if (!hci_can_send_command_packet_now()) return; 2128 2129 log_info("HCI_STATE_HALTING, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2130 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2131 2132 // send disconnected event right away - causes higher layer connections to get closed, too. 2133 hci_shutdown_connection(connection); 2134 return; 2135 } 2136 log_info("HCI_STATE_HALTING, calling off"); 2137 2138 // switch mode 2139 hci_power_control_off(); 2140 2141 log_info("HCI_STATE_HALTING, emitting state"); 2142 hci_emit_state(); 2143 log_info("HCI_STATE_HALTING, done"); 2144 break; 2145 2146 case HCI_STATE_FALLING_ASLEEP: 2147 switch(hci_stack->substate) { 2148 case 0: 2149 log_info("HCI_STATE_FALLING_ASLEEP"); 2150 // close all open connections 2151 connection = (hci_connection_t *) hci_stack->connections; 2152 2153 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2154 // don't close connections, if H4 supports power management 2155 if (bt_control_iphone_power_management_enabled()){ 2156 connection = NULL; 2157 } 2158 #endif 2159 if (connection){ 2160 2161 // send disconnect 2162 if (!hci_can_send_command_packet_now()) return; 2163 2164 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2165 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2166 2167 // send disconnected event right away - causes higher layer connections to get closed, too. 2168 hci_shutdown_connection(connection); 2169 return; 2170 } 2171 2172 if (hci_classic_supported()){ 2173 // disable page and inquiry scan 2174 if (!hci_can_send_command_packet_now()) return; 2175 2176 log_info("HCI_STATE_HALTING, disabling inq scans"); 2177 hci_send_cmd(&hci_write_scan_enable, hci_stack->connectable << 1); // drop inquiry scan but keep page scan 2178 2179 // continue in next sub state 2180 hci_stack->substate++; 2181 break; 2182 } 2183 // fall through for ble-only chips 2184 2185 case 2: 2186 log_info("HCI_STATE_HALTING, calling sleep"); 2187 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2188 // don't actually go to sleep, if H4 supports power management 2189 if (bt_control_iphone_power_management_enabled()){ 2190 // SLEEP MODE reached 2191 hci_stack->state = HCI_STATE_SLEEPING; 2192 hci_emit_state(); 2193 break; 2194 } 2195 #endif 2196 // switch mode 2197 hci_power_control_sleep(); // changes hci_stack->state to SLEEP 2198 hci_emit_state(); 2199 break; 2200 2201 default: 2202 break; 2203 } 2204 break; 2205 2206 default: 2207 break; 2208 } 2209 } 2210 2211 int hci_send_cmd_packet(uint8_t *packet, int size){ 2212 bd_addr_t addr; 2213 hci_connection_t * conn; 2214 // house-keeping 2215 2216 // create_connection? 2217 if (IS_COMMAND(packet, hci_create_connection)){ 2218 bt_flip_addr(addr, &packet[3]); 2219 log_info("Create_connection to %s", bd_addr_to_str(addr)); 2220 2221 conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2222 if (!conn){ 2223 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2224 if (!conn){ 2225 // notify client that alloc failed 2226 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 2227 return 0; // don't sent packet to controller 2228 } 2229 conn->state = SEND_CREATE_CONNECTION; 2230 } 2231 log_info("conn state %u", conn->state); 2232 switch (conn->state){ 2233 // if connection active exists 2234 case OPEN: 2235 // and OPEN, emit connection complete command, don't send to controller 2236 hci_emit_connection_complete(conn, 0); 2237 return 0; 2238 case SEND_CREATE_CONNECTION: 2239 // connection created by hci, e.g. dedicated bonding 2240 break; 2241 default: 2242 // otherwise, just ignore as it is already in the open process 2243 return 0; 2244 } 2245 conn->state = SENT_CREATE_CONNECTION; 2246 } 2247 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 2248 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 2249 } 2250 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 2251 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 2252 } 2253 2254 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 2255 if (hci_stack->remote_device_db){ 2256 bt_flip_addr(addr, &packet[3]); 2257 hci_stack->remote_device_db->delete_link_key(addr); 2258 } 2259 } 2260 2261 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply) 2262 || IS_COMMAND(packet, hci_pin_code_request_reply)){ 2263 bt_flip_addr(addr, &packet[3]); 2264 conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2265 if (conn){ 2266 connectionClearAuthenticationFlags(conn, LEGACY_PAIRING_ACTIVE); 2267 } 2268 } 2269 2270 if (IS_COMMAND(packet, hci_user_confirmation_request_negative_reply) 2271 || IS_COMMAND(packet, hci_user_confirmation_request_reply) 2272 || IS_COMMAND(packet, hci_user_passkey_request_negative_reply) 2273 || IS_COMMAND(packet, hci_user_passkey_request_reply)) { 2274 bt_flip_addr(addr, &packet[3]); 2275 conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2276 if (conn){ 2277 connectionClearAuthenticationFlags(conn, SSP_PAIRING_ACTIVE); 2278 } 2279 } 2280 2281 #ifdef HAVE_BLE 2282 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 2283 hci_stack->adv_addr_type = packet[8]; 2284 } 2285 if (IS_COMMAND(packet, hci_le_set_random_address)){ 2286 bt_flip_addr(hci_stack->adv_address, &packet[3]); 2287 } 2288 #endif 2289 2290 hci_stack->num_cmd_packets--; 2291 2292 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, packet, size); 2293 int err = hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 2294 2295 // release packet buffer for synchronous transport implementations 2296 if (hci_transport_synchronous() && (packet == hci_stack->hci_packet_buffer)){ 2297 hci_stack->hci_packet_buffer_reserved = 0; 2298 } 2299 2300 return err; 2301 } 2302 2303 // disconnect because of security block 2304 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 2305 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2306 if (!connection) return; 2307 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 2308 } 2309 2310 2311 // Configure Secure Simple Pairing 2312 2313 // enable will enable SSP during init 2314 void hci_ssp_set_enable(int enable){ 2315 hci_stack->ssp_enable = enable; 2316 } 2317 2318 int hci_local_ssp_activated(){ 2319 return hci_ssp_supported() && hci_stack->ssp_enable; 2320 } 2321 2322 // if set, BTstack will respond to io capability request using authentication requirement 2323 void hci_ssp_set_io_capability(int io_capability){ 2324 hci_stack->ssp_io_capability = io_capability; 2325 } 2326 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 2327 hci_stack->ssp_authentication_requirement = authentication_requirement; 2328 } 2329 2330 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 2331 void hci_ssp_set_auto_accept(int auto_accept){ 2332 hci_stack->ssp_auto_accept = auto_accept; 2333 } 2334 2335 /** 2336 * pre: numcmds >= 0 - it's allowed to send a command to the controller 2337 */ 2338 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 2339 2340 if (!hci_can_send_command_packet_now()){ 2341 log_error("hci_send_cmd called but cannot send packet now"); 2342 return 0; 2343 } 2344 2345 // for HCI INITIALIZATION 2346 // log_info("hci_send_cmd: opcode %04x", cmd->opcode); 2347 hci_stack->last_cmd_opcode = cmd->opcode; 2348 2349 hci_reserve_packet_buffer(); 2350 uint8_t * packet = hci_stack->hci_packet_buffer; 2351 2352 va_list argptr; 2353 va_start(argptr, cmd); 2354 uint16_t size = hci_create_cmd_internal(packet, cmd, argptr); 2355 va_end(argptr); 2356 2357 return hci_send_cmd_packet(packet, size); 2358 } 2359 2360 // Create various non-HCI events. 2361 // TODO: generalize, use table similar to hci_create_command 2362 2363 void hci_emit_state(){ 2364 log_info("BTSTACK_EVENT_STATE %u", hci_stack->state); 2365 uint8_t event[3]; 2366 event[0] = BTSTACK_EVENT_STATE; 2367 event[1] = sizeof(event) - 2; 2368 event[2] = hci_stack->state; 2369 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2370 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2371 } 2372 2373 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 2374 uint8_t event[13]; 2375 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 2376 event[1] = sizeof(event) - 2; 2377 event[2] = status; 2378 bt_store_16(event, 3, conn->con_handle); 2379 bt_flip_addr(&event[5], conn->address); 2380 event[11] = 1; // ACL connection 2381 event[12] = 0; // encryption disabled 2382 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2383 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2384 } 2385 2386 void hci_emit_le_connection_complete(uint8_t address_type, bd_addr_t address, uint16_t conn_handle, uint8_t status){ 2387 uint8_t event[21]; 2388 event[0] = HCI_EVENT_LE_META; 2389 event[1] = sizeof(event) - 2; 2390 event[2] = HCI_SUBEVENT_LE_CONNECTION_COMPLETE; 2391 event[3] = status; 2392 bt_store_16(event, 4, conn_handle); 2393 event[6] = 0; // TODO: role 2394 event[7] = address_type; 2395 bt_flip_addr(&event[8], address); 2396 bt_store_16(event, 14, 0); // interval 2397 bt_store_16(event, 16, 0); // latency 2398 bt_store_16(event, 18, 0); // supervision timeout 2399 event[20] = 0; // master clock accuracy 2400 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2401 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2402 } 2403 2404 void hci_emit_disconnection_complete(uint16_t handle, uint8_t reason){ 2405 uint8_t event[6]; 2406 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 2407 event[1] = sizeof(event) - 2; 2408 event[2] = 0; // status = OK 2409 bt_store_16(event, 3, handle); 2410 event[5] = reason; 2411 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2412 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2413 } 2414 2415 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 2416 if (disable_l2cap_timeouts) return; 2417 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 2418 uint8_t event[4]; 2419 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 2420 event[1] = sizeof(event) - 2; 2421 bt_store_16(event, 2, conn->con_handle); 2422 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2423 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2424 } 2425 2426 void hci_emit_nr_connections_changed(){ 2427 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 2428 uint8_t event[3]; 2429 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 2430 event[1] = sizeof(event) - 2; 2431 event[2] = nr_hci_connections(); 2432 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2433 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2434 } 2435 2436 void hci_emit_hci_open_failed(){ 2437 log_info("BTSTACK_EVENT_POWERON_FAILED"); 2438 uint8_t event[2]; 2439 event[0] = BTSTACK_EVENT_POWERON_FAILED; 2440 event[1] = sizeof(event) - 2; 2441 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2442 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2443 } 2444 2445 #ifndef EMBEDDED 2446 void hci_emit_btstack_version() { 2447 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 2448 uint8_t event[6]; 2449 event[0] = BTSTACK_EVENT_VERSION; 2450 event[1] = sizeof(event) - 2; 2451 event[2] = BTSTACK_MAJOR; 2452 event[3] = BTSTACK_MINOR; 2453 bt_store_16(event, 4, BTSTACK_REVISION); 2454 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2455 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2456 } 2457 #endif 2458 2459 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 2460 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 2461 uint8_t event[3]; 2462 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 2463 event[1] = sizeof(event) - 2; 2464 event[2] = enabled; 2465 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2466 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2467 } 2468 2469 void hci_emit_remote_name_cached(bd_addr_t addr, device_name_t *name){ 2470 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 2471 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 2472 event[1] = sizeof(event) - 2 - 1; 2473 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 2474 bt_flip_addr(&event[3], addr); 2475 memcpy(&event[9], name, 248); 2476 2477 event[9+248] = 0; // assert \0 for log_info 2478 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(addr), &event[9]); 2479 2480 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 2481 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 2482 } 2483 2484 void hci_emit_discoverable_enabled(uint8_t enabled){ 2485 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 2486 uint8_t event[3]; 2487 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 2488 event[1] = sizeof(event) - 2; 2489 event[2] = enabled; 2490 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2491 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2492 } 2493 2494 void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){ 2495 log_info("hci_emit_security_level %u for handle %x", level, con_handle); 2496 uint8_t event[5]; 2497 int pos = 0; 2498 event[pos++] = GAP_SECURITY_LEVEL; 2499 event[pos++] = sizeof(event) - 2; 2500 bt_store_16(event, 2, con_handle); 2501 pos += 2; 2502 event[pos++] = level; 2503 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2504 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2505 } 2506 2507 void hci_emit_dedicated_bonding_result(bd_addr_t address, uint8_t status){ 2508 log_info("hci_emit_dedicated_bonding_result %u ", status); 2509 uint8_t event[9]; 2510 int pos = 0; 2511 event[pos++] = GAP_DEDICATED_BONDING_COMPLETED; 2512 event[pos++] = sizeof(event) - 2; 2513 event[pos++] = status; 2514 bt_flip_addr( &event[pos], address); 2515 pos += 6; 2516 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2517 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2518 } 2519 2520 // query if remote side supports SSP 2521 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 2522 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2523 if (!connection) return 0; 2524 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 2525 } 2526 2527 int hci_ssp_supported_on_both_sides(hci_con_handle_t handle){ 2528 return hci_local_ssp_activated() && hci_remote_ssp_supported(handle); 2529 } 2530 2531 // GAP API 2532 /** 2533 * @bbrief enable/disable bonding. default is enabled 2534 * @praram enabled 2535 */ 2536 void gap_set_bondable_mode(int enable){ 2537 hci_stack->bondable = enable ? 1 : 0; 2538 } 2539 2540 /** 2541 * @brief map link keys to security levels 2542 */ 2543 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 2544 switch (link_key_type){ 2545 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 2546 return LEVEL_4; 2547 case COMBINATION_KEY: 2548 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 2549 return LEVEL_3; 2550 default: 2551 return LEVEL_2; 2552 } 2553 } 2554 2555 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 2556 if (!connection) return LEVEL_0; 2557 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 2558 return gap_security_level_for_link_key_type(connection->link_key_type); 2559 } 2560 2561 2562 int gap_mitm_protection_required_for_security_level(gap_security_level_t level){ 2563 log_info("gap_mitm_protection_required_for_security_level %u", level); 2564 return level > LEVEL_2; 2565 } 2566 2567 /** 2568 * @brief get current security level 2569 */ 2570 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 2571 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2572 if (!connection) return LEVEL_0; 2573 return gap_security_level_for_connection(connection); 2574 } 2575 2576 /** 2577 * @brief request connection to device to 2578 * @result GAP_AUTHENTICATION_RESULT 2579 */ 2580 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 2581 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2582 if (!connection){ 2583 hci_emit_security_level(con_handle, LEVEL_0); 2584 return; 2585 } 2586 gap_security_level_t current_level = gap_security_level(con_handle); 2587 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 2588 if (current_level >= requested_level){ 2589 hci_emit_security_level(con_handle, current_level); 2590 return; 2591 } 2592 2593 connection->requested_security_level = requested_level; 2594 2595 #if 0 2596 // sending encryption request without a link key results in an error. 2597 // TODO: figure out how to use it properly 2598 2599 // would enabling ecnryption suffice (>= LEVEL_2)? 2600 if (hci_stack->remote_device_db){ 2601 link_key_type_t link_key_type; 2602 link_key_t link_key; 2603 if (hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type)){ 2604 if (gap_security_level_for_link_key_type(link_key_type) >= requested_level){ 2605 connection->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 2606 return; 2607 } 2608 } 2609 } 2610 #endif 2611 2612 // try to authenticate connection 2613 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 2614 hci_run(); 2615 } 2616 2617 /** 2618 * @brief start dedicated bonding with device. disconnect after bonding 2619 * @param device 2620 * @param request MITM protection 2621 * @result GAP_DEDICATED_BONDING_COMPLETE 2622 */ 2623 int gap_dedicated_bonding(bd_addr_t device, int mitm_protection_required){ 2624 2625 // create connection state machine 2626 hci_connection_t * connection = create_connection_for_bd_addr_and_type(device, BD_ADDR_TYPE_CLASSIC); 2627 2628 if (!connection){ 2629 return BTSTACK_MEMORY_ALLOC_FAILED; 2630 } 2631 2632 // delete linkn key 2633 hci_drop_link_key_for_bd_addr(device); 2634 2635 // configure LEVEL_2/3, dedicated bonding 2636 connection->state = SEND_CREATE_CONNECTION; 2637 connection->requested_security_level = mitm_protection_required ? LEVEL_3 : LEVEL_2; 2638 log_info("gap_dedicated_bonding, mitm %u -> level %u", mitm_protection_required, connection->requested_security_level); 2639 connection->bonding_flags = BONDING_DEDICATED; 2640 2641 // wait for GAP Security Result and send GAP Dedicated Bonding complete 2642 2643 // handle: connnection failure (connection complete != ok) 2644 // handle: authentication failure 2645 // handle: disconnect on done 2646 2647 hci_run(); 2648 2649 return 0; 2650 } 2651 2652 void gap_set_local_name(const char * local_name){ 2653 hci_stack->local_name = local_name; 2654 } 2655 2656 le_command_status_t le_central_start_scan(){ 2657 if (hci_stack->le_scanning_state == LE_SCANNING) return BLE_PERIPHERAL_OK; 2658 hci_stack->le_scanning_state = LE_START_SCAN; 2659 hci_run(); 2660 return BLE_PERIPHERAL_OK; 2661 } 2662 2663 le_command_status_t le_central_stop_scan(){ 2664 if ( hci_stack->le_scanning_state == LE_SCAN_IDLE) return BLE_PERIPHERAL_OK; 2665 hci_stack->le_scanning_state = LE_STOP_SCAN; 2666 hci_run(); 2667 return BLE_PERIPHERAL_OK; 2668 } 2669 2670 void le_central_set_scan_parameters(uint8_t scan_type, uint16_t scan_interval, uint16_t scan_window){ 2671 hci_stack->le_scan_type = scan_type; 2672 hci_stack->le_scan_interval = scan_interval; 2673 hci_stack->le_scan_window = scan_window; 2674 hci_run(); 2675 } 2676 2677 le_command_status_t le_central_connect(bd_addr_t addr, bd_addr_type_t addr_type){ 2678 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 2679 if (!conn){ 2680 log_info("le_central_connect: no connection exists yet, creating context"); 2681 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 2682 if (!conn){ 2683 // notify client that alloc failed 2684 hci_emit_le_connection_complete(addr_type, addr, 0, BTSTACK_MEMORY_ALLOC_FAILED); 2685 log_info("le_central_connect: failed to alloc hci_connection_t"); 2686 return BLE_PERIPHERAL_NOT_CONNECTED; // don't sent packet to controller 2687 } 2688 conn->state = SEND_CREATE_CONNECTION; 2689 log_info("le_central_connect: send create connection next"); 2690 hci_run(); 2691 return BLE_PERIPHERAL_OK; 2692 } 2693 2694 if (!hci_is_le_connection(conn) || 2695 conn->state == SEND_CREATE_CONNECTION || 2696 conn->state == SENT_CREATE_CONNECTION) { 2697 hci_emit_le_connection_complete(conn->address_type, conn->address, 0, ERROR_CODE_COMMAND_DISALLOWED); 2698 log_error("le_central_connect: classic connection or connect is already being created"); 2699 return BLE_PERIPHERAL_IN_WRONG_STATE; 2700 } 2701 2702 log_info("le_central_connect: context exists with state %u", conn->state); 2703 hci_emit_le_connection_complete(conn->address_type, conn->address, conn->con_handle, 0); 2704 hci_run(); 2705 return BLE_PERIPHERAL_OK; 2706 } 2707 2708 // @assumption: only a single outgoing LE Connection exists 2709 static hci_connection_t * le_central_get_outgoing_connection(){ 2710 linked_item_t *it; 2711 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 2712 hci_connection_t * conn = (hci_connection_t *) it; 2713 if (!hci_is_le_connection(conn)) continue; 2714 switch (conn->state){ 2715 case SEND_CREATE_CONNECTION: 2716 case SENT_CREATE_CONNECTION: 2717 return conn; 2718 default: 2719 break; 2720 }; 2721 } 2722 return NULL; 2723 } 2724 2725 le_command_status_t le_central_connect_cancel(){ 2726 hci_connection_t * conn = le_central_get_outgoing_connection(); 2727 switch (conn->state){ 2728 case SEND_CREATE_CONNECTION: 2729 // skip sending create connection and emit event instead 2730 hci_emit_le_connection_complete(conn->address_type, conn->address, 0, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 2731 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 2732 btstack_memory_hci_connection_free( conn ); 2733 break; 2734 case SENT_CREATE_CONNECTION: 2735 // request to send cancel connection 2736 conn->state = SEND_CANCEL_CONNECTION; 2737 hci_run(); 2738 break; 2739 default: 2740 break; 2741 } 2742 return BLE_PERIPHERAL_OK; 2743 } 2744 2745 /** 2746 * @brief Updates the connection parameters for a given LE connection 2747 * @param handle 2748 * @param conn_interval_min (unit: 1.25ms) 2749 * @param conn_interval_max (unit: 1.25ms) 2750 * @param conn_latency 2751 * @param supervision_timeout (unit: 10ms) 2752 * @returns 0 if ok 2753 */ 2754 int gap_update_connection_parameters(hci_con_handle_t con_handle, uint16_t conn_interval_min, 2755 uint16_t conn_interval_max, uint16_t conn_latency, uint16_t supervision_timeout){ 2756 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2757 if (!connection) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2758 connection->le_conn_interval_min = conn_interval_min; 2759 connection->le_conn_interval_max = conn_interval_max; 2760 connection->le_conn_latency = conn_latency; 2761 connection->le_supervision_timeout = supervision_timeout; 2762 return 0; 2763 } 2764 2765 le_command_status_t gap_disconnect(hci_con_handle_t handle){ 2766 hci_connection_t * conn = hci_connection_for_handle(handle); 2767 if (!conn){ 2768 hci_emit_disconnection_complete(handle, 0); 2769 return BLE_PERIPHERAL_OK; 2770 } 2771 conn->state = SEND_DISCONNECT; 2772 hci_run(); 2773 return BLE_PERIPHERAL_OK; 2774 } 2775 2776 void hci_disconnect_all(){ 2777 linked_list_iterator_t it; 2778 linked_list_iterator_init(&it, &hci_stack->connections); 2779 while (linked_list_iterator_has_next(&it)){ 2780 hci_connection_t * con = (hci_connection_t*) linked_list_iterator_next(&it); 2781 if (con->state == SENT_DISCONNECT) continue; 2782 con->state = SEND_DISCONNECT; 2783 } 2784 hci_run(); 2785 } 2786