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 #ifdef USE_BLUETOOL 73 #include "../platforms/ios/src/bt_control_iphone.h" 74 #endif 75 76 static void hci_update_scan_enable(void); 77 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection); 78 static void hci_connection_timeout_handler(timer_source_t *timer); 79 static void hci_connection_timestamp(hci_connection_t *connection); 80 static int hci_power_control_on(void); 81 static void hci_power_control_off(void); 82 static void hci_state_reset(); 83 84 // the STACK is here 85 #ifndef HAVE_MALLOC 86 static hci_stack_t hci_stack_static; 87 #endif 88 static hci_stack_t * hci_stack = NULL; 89 90 // test helper 91 static uint8_t disable_l2cap_timeouts = 0; 92 93 /** 94 * create connection for given address 95 * 96 * @return connection OR NULL, if no memory left 97 */ 98 static hci_connection_t * create_connection_for_bd_addr_and_type(bd_addr_t addr, bd_addr_type_t addr_type){ 99 log_info("create_connection_for_addr %s, type %x", bd_addr_to_str(addr), addr_type); 100 hci_connection_t * conn = btstack_memory_hci_connection_get(); 101 if (!conn) return NULL; 102 memset(conn, 0, sizeof(hci_connection_t)); 103 BD_ADDR_COPY(conn->address, addr); 104 conn->address_type = addr_type; 105 conn->con_handle = 0xffff; 106 conn->authentication_flags = AUTH_FLAGS_NONE; 107 conn->bonding_flags = 0; 108 conn->requested_security_level = LEVEL_0; 109 linked_item_set_user(&conn->timeout.item, conn); 110 conn->timeout.process = hci_connection_timeout_handler; 111 hci_connection_timestamp(conn); 112 conn->acl_recombination_length = 0; 113 conn->acl_recombination_pos = 0; 114 conn->num_acl_packets_sent = 0; 115 conn->num_sco_packets_sent = 0; 116 conn->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 117 linked_list_add(&hci_stack->connections, (linked_item_t *) conn); 118 return conn; 119 } 120 121 122 /** 123 * get le connection parameter range 124 * 125 * @return le connection parameter range struct 126 */ 127 le_connection_parameter_range_t gap_le_get_connection_parameter_range(){ 128 return hci_stack->le_connection_parameter_range; 129 } 130 131 /** 132 * set le connection parameter range 133 * 134 */ 135 136 void gap_le_set_connection_parameter_range(le_connection_parameter_range_t range){ 137 hci_stack->le_connection_parameter_range.le_conn_interval_min = range.le_conn_interval_min; 138 hci_stack->le_connection_parameter_range.le_conn_interval_max = range.le_conn_interval_max; 139 hci_stack->le_connection_parameter_range.le_conn_interval_min = range.le_conn_latency_min; 140 hci_stack->le_connection_parameter_range.le_conn_interval_max = range.le_conn_latency_max; 141 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = range.le_supervision_timeout_min; 142 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = range.le_supervision_timeout_max; 143 } 144 145 /** 146 * get hci connections iterator 147 * 148 * @return hci connections iterator 149 */ 150 151 void hci_connections_get_iterator(linked_list_iterator_t *it){ 152 linked_list_iterator_init(it, &hci_stack->connections); 153 } 154 155 /** 156 * get connection for a given handle 157 * 158 * @return connection OR NULL, if not found 159 */ 160 hci_connection_t * hci_connection_for_handle(hci_con_handle_t con_handle){ 161 linked_list_iterator_t it; 162 linked_list_iterator_init(&it, &hci_stack->connections); 163 while (linked_list_iterator_has_next(&it)){ 164 hci_connection_t * item = (hci_connection_t *) linked_list_iterator_next(&it); 165 if ( item->con_handle == con_handle ) { 166 return item; 167 } 168 } 169 return NULL; 170 } 171 172 /** 173 * get connection for given address 174 * 175 * @return connection OR NULL, if not found 176 */ 177 hci_connection_t * hci_connection_for_bd_addr_and_type(bd_addr_t addr, bd_addr_type_t addr_type){ 178 linked_list_iterator_t it; 179 linked_list_iterator_init(&it, &hci_stack->connections); 180 while (linked_list_iterator_has_next(&it)){ 181 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 182 if (connection->address_type != addr_type) continue; 183 if (memcmp(addr, connection->address, 6) != 0) continue; 184 return connection; 185 } 186 return NULL; 187 } 188 189 static void hci_connection_timeout_handler(timer_source_t *timer){ 190 hci_connection_t * connection = (hci_connection_t *) linked_item_get_user(&timer->item); 191 #ifdef HAVE_TIME 192 struct timeval tv; 193 gettimeofday(&tv, NULL); 194 if (tv.tv_sec >= connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000) { 195 // connections might be timed out 196 hci_emit_l2cap_check_timeout(connection); 197 } 198 #endif 199 #ifdef HAVE_TICK 200 if (embedded_get_ticks() > connection->timestamp + embedded_ticks_for_ms(HCI_CONNECTION_TIMEOUT_MS)){ 201 // connections might be timed out 202 hci_emit_l2cap_check_timeout(connection); 203 } 204 #endif 205 run_loop_set_timer(timer, HCI_CONNECTION_TIMEOUT_MS); 206 run_loop_add_timer(timer); 207 } 208 209 static void hci_connection_timestamp(hci_connection_t *connection){ 210 #ifdef HAVE_TIME 211 gettimeofday(&connection->timestamp, NULL); 212 #endif 213 #ifdef HAVE_TICK 214 connection->timestamp = embedded_get_ticks(); 215 #endif 216 } 217 218 219 inline static void connectionSetAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 220 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags | flags); 221 } 222 223 inline static void connectionClearAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 224 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags & ~flags); 225 } 226 227 228 /** 229 * add authentication flags and reset timer 230 * @note: assumes classic connection 231 * @note: bd_addr is passed in as litle endian uint8_t * as it is called from parsing packets 232 */ 233 static void hci_add_connection_flags_for_flipped_bd_addr(uint8_t *bd_addr, hci_authentication_flags_t flags){ 234 bd_addr_t addr; 235 bt_flip_addr(addr, bd_addr); 236 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 237 if (conn) { 238 connectionSetAuthenticationFlags(conn, flags); 239 hci_connection_timestamp(conn); 240 } 241 } 242 243 int hci_authentication_active_for_handle(hci_con_handle_t handle){ 244 hci_connection_t * conn = hci_connection_for_handle(handle); 245 if (!conn) return 0; 246 if (conn->authentication_flags & LEGACY_PAIRING_ACTIVE) return 1; 247 if (conn->authentication_flags & SSP_PAIRING_ACTIVE) return 1; 248 return 0; 249 } 250 251 void hci_drop_link_key_for_bd_addr(bd_addr_t addr){ 252 if (hci_stack->remote_device_db) { 253 hci_stack->remote_device_db->delete_link_key(addr); 254 } 255 } 256 257 int hci_is_le_connection(hci_connection_t * connection){ 258 return connection->address_type == BD_ADDR_TYPE_LE_PUBLIC || 259 connection->address_type == BD_ADDR_TYPE_LE_RANDOM; 260 } 261 262 263 /** 264 * count connections 265 */ 266 static int nr_hci_connections(void){ 267 int count = 0; 268 linked_item_t *it; 269 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next, count++); 270 return count; 271 } 272 273 /** 274 * Dummy handler called by HCI 275 */ 276 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 277 } 278 279 uint8_t hci_number_outgoing_packets(hci_con_handle_t handle){ 280 hci_connection_t * connection = hci_connection_for_handle(handle); 281 if (!connection) { 282 log_error("hci_number_outgoing_packets: connection for handle %u does not exist!", handle); 283 return 0; 284 } 285 return connection->num_acl_packets_sent; 286 } 287 288 uint8_t hci_number_free_acl_slots_for_handle(hci_con_handle_t con_handle){ 289 290 int num_packets_sent_classic = 0; 291 int num_packets_sent_le = 0; 292 293 bd_addr_type_t address_type = BD_ADDR_TYPE_UNKNOWN; 294 295 linked_item_t *it; 296 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 297 hci_connection_t * connection = (hci_connection_t *) it; 298 if (connection->address_type == BD_ADDR_TYPE_CLASSIC){ 299 num_packets_sent_classic += connection->num_acl_packets_sent; 300 } else { 301 num_packets_sent_le += connection->num_acl_packets_sent; 302 } 303 // ignore connections that are not open, e.g., in state RECEIVED_DISCONNECTION_COMPLETE 304 if (connection->con_handle == con_handle && connection->state == OPEN){ 305 address_type = connection->address_type; 306 } 307 } 308 309 int free_slots_classic = hci_stack->acl_packets_total_num - num_packets_sent_classic; 310 int free_slots_le = 0; 311 312 if (free_slots_classic < 0){ 313 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); 314 return 0; 315 } 316 317 if (hci_stack->le_acl_packets_total_num){ 318 // if we have LE slots, they are used 319 free_slots_le = hci_stack->le_acl_packets_total_num - num_packets_sent_le; 320 if (free_slots_le < 0){ 321 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); 322 return 0; 323 } 324 } else { 325 // otherwise, classic slots are used for LE, too 326 free_slots_classic -= num_packets_sent_le; 327 if (free_slots_classic < 0){ 328 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); 329 return 0; 330 } 331 } 332 333 switch (address_type){ 334 case BD_ADDR_TYPE_UNKNOWN: 335 log_error("hci_number_free_acl_slots: handle 0x%04x not in connection list", con_handle); 336 return 0; 337 338 case BD_ADDR_TYPE_CLASSIC: 339 return free_slots_classic; 340 341 default: 342 if (hci_stack->le_acl_packets_total_num){ 343 return free_slots_le; 344 } 345 return free_slots_classic; 346 } 347 } 348 349 int hci_number_free_sco_slots_for_handle(hci_con_handle_t handle){ 350 int num_sco_packets_sent = 0; 351 linked_item_t *it; 352 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 353 hci_connection_t * connection = (hci_connection_t *) it; 354 num_sco_packets_sent += connection->num_sco_packets_sent; 355 } 356 if (num_sco_packets_sent > hci_stack->sco_packets_total_num){ 357 log_info("hci_number_free_sco_slots_for_handle: outgoing packets (%u) > total packets ()", num_sco_packets_sent, hci_stack->sco_packets_total_num); 358 return 0; 359 } 360 return hci_stack->sco_packets_total_num - num_sco_packets_sent; 361 } 362 363 // new functions replacing hci_can_send_packet_now[_using_packet_buffer] 364 int hci_can_send_command_packet_now(void){ 365 if (hci_stack->hci_packet_buffer_reserved) return 0; 366 367 // check for async hci transport implementations 368 if (hci_stack->hci_transport->can_send_packet_now){ 369 if (!hci_stack->hci_transport->can_send_packet_now(HCI_COMMAND_DATA_PACKET)){ 370 return 0; 371 } 372 } 373 374 return hci_stack->num_cmd_packets > 0; 375 } 376 377 int hci_can_send_prepared_acl_packet_now(hci_con_handle_t con_handle) { 378 // check for async hci transport implementations 379 if (hci_stack->hci_transport->can_send_packet_now){ 380 if (!hci_stack->hci_transport->can_send_packet_now(HCI_ACL_DATA_PACKET)){ 381 return 0; 382 } 383 } 384 return hci_number_free_acl_slots_for_handle(con_handle) > 0; 385 } 386 387 int hci_can_send_acl_packet_now(hci_con_handle_t con_handle){ 388 if (hci_stack->hci_packet_buffer_reserved) return 0; 389 return hci_can_send_prepared_acl_packet_now(con_handle); 390 } 391 392 int hci_can_send_prepared_sco_packet_now(hci_con_handle_t con_handle){ 393 if (hci_stack->hci_transport->can_send_packet_now){ 394 if (!hci_stack->hci_transport->can_send_packet_now(HCI_SCO_DATA_PACKET)){ 395 return 0; 396 } 397 } 398 return hci_number_free_sco_slots_for_handle(con_handle) > 0; 399 } 400 401 int hci_can_send_sco_packet_now(hci_con_handle_t con_handle){ 402 if (hci_stack->hci_packet_buffer_reserved) return 0; 403 return hci_can_send_prepared_sco_packet_now(con_handle); 404 } 405 406 // used for internal checks in l2cap[-le].c 407 int hci_is_packet_buffer_reserved(void){ 408 return hci_stack->hci_packet_buffer_reserved; 409 } 410 411 // reserves outgoing packet buffer. @returns 1 if successful 412 int hci_reserve_packet_buffer(void){ 413 if (hci_stack->hci_packet_buffer_reserved) { 414 log_error("hci_reserve_packet_buffer called but buffer already reserved"); 415 return 0; 416 } 417 hci_stack->hci_packet_buffer_reserved = 1; 418 return 1; 419 } 420 421 void hci_release_packet_buffer(void){ 422 hci_stack->hci_packet_buffer_reserved = 0; 423 } 424 425 // assumption: synchronous implementations don't provide can_send_packet_now as they don't keep the buffer after the call 426 int hci_transport_synchronous(void){ 427 return hci_stack->hci_transport->can_send_packet_now == NULL; 428 } 429 430 uint16_t hci_max_acl_le_data_packet_length(void){ 431 return hci_stack->le_data_packets_length > 0 ? hci_stack->le_data_packets_length : hci_stack->acl_data_packet_length; 432 } 433 434 static int hci_send_acl_packet_fragments(hci_connection_t *connection){ 435 436 // 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); 437 438 // max ACL data packet length depends on connection type (LE vs. Classic) and available buffers 439 uint16_t max_acl_data_packet_length = hci_stack->acl_data_packet_length; 440 if (hci_is_le_connection(connection) && hci_stack->le_data_packets_length > 0){ 441 max_acl_data_packet_length = hci_stack->le_data_packets_length; 442 } 443 444 // testing: reduce buffer to minimum 445 // max_acl_data_packet_length = 52; 446 447 int err; 448 // multiple packets could be send on a synchronous HCI transport 449 while (1){ 450 451 // get current data 452 const uint16_t acl_header_pos = hci_stack->acl_fragmentation_pos - 4; 453 int current_acl_data_packet_length = hci_stack->acl_fragmentation_total_size - hci_stack->acl_fragmentation_pos; 454 int more_fragments = 0; 455 456 // if ACL packet is larger than Bluetooth packet buffer, only send max_acl_data_packet_length 457 if (current_acl_data_packet_length > max_acl_data_packet_length){ 458 more_fragments = 1; 459 current_acl_data_packet_length = max_acl_data_packet_length; 460 } 461 462 // copy handle_and_flags if not first fragment and update packet boundary flags to be 01 (continuing fragmnent) 463 if (acl_header_pos > 0){ 464 uint16_t handle_and_flags = READ_BT_16(hci_stack->hci_packet_buffer, 0); 465 handle_and_flags = (handle_and_flags & 0xcfff) | (1 << 12); 466 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos, handle_and_flags); 467 } 468 469 // update header len 470 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos + 2, current_acl_data_packet_length); 471 472 // count packet 473 connection->num_acl_packets_sent++; 474 475 // send packet 476 uint8_t * packet = &hci_stack->hci_packet_buffer[acl_header_pos]; 477 const int size = current_acl_data_packet_length + 4; 478 hci_dump_packet(HCI_ACL_DATA_PACKET, 0, packet, size); 479 err = hci_stack->hci_transport->send_packet(HCI_ACL_DATA_PACKET, packet, size); 480 481 // done yet? 482 if (!more_fragments) break; 483 484 // update start of next fragment to send 485 hci_stack->acl_fragmentation_pos += current_acl_data_packet_length; 486 487 // can send more? 488 if (!hci_can_send_prepared_acl_packet_now(connection->con_handle)) return err; 489 } 490 491 // done 492 hci_stack->acl_fragmentation_pos = 0; 493 hci_stack->acl_fragmentation_total_size = 0; 494 495 // release buffer now for synchronous transport 496 if (hci_transport_synchronous()){ 497 hci_release_packet_buffer(); 498 // notify upper stack that iit might be possible to send again 499 uint8_t event[] = { DAEMON_EVENT_HCI_PACKET_SENT, 0}; 500 hci_stack->packet_handler(HCI_EVENT_PACKET, &event[0], sizeof(event)); 501 } 502 503 return err; 504 } 505 506 // pre: caller has reserved the packet buffer 507 int hci_send_acl_packet_buffer(int size){ 508 509 // log_info("hci_send_acl_packet_buffer size %u", size); 510 511 if (!hci_stack->hci_packet_buffer_reserved) { 512 log_error("hci_send_acl_packet_buffer called without reserving packet buffer"); 513 return 0; 514 } 515 516 uint8_t * packet = hci_stack->hci_packet_buffer; 517 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 518 519 // check for free places on Bluetooth module 520 if (!hci_can_send_prepared_acl_packet_now(con_handle)) { 521 log_error("hci_send_acl_packet_buffer called but no free ACL buffers on controller"); 522 hci_release_packet_buffer(); 523 return BTSTACK_ACL_BUFFERS_FULL; 524 } 525 526 hci_connection_t *connection = hci_connection_for_handle( con_handle); 527 if (!connection) { 528 log_error("hci_send_acl_packet_buffer called but no connection for handle 0x%04x", con_handle); 529 hci_release_packet_buffer(); 530 return 0; 531 } 532 hci_connection_timestamp(connection); 533 534 // hci_dump_packet( HCI_ACL_DATA_PACKET, 0, packet, size); 535 536 // setup data 537 hci_stack->acl_fragmentation_total_size = size; 538 hci_stack->acl_fragmentation_pos = 4; // start of L2CAP packet 539 540 return hci_send_acl_packet_fragments(connection); 541 } 542 543 // pre: caller has reserved the packet buffer 544 int hci_send_sco_packet_buffer(int size){ 545 546 // log_info("hci_send_acl_packet_buffer size %u", size); 547 548 if (!hci_stack->hci_packet_buffer_reserved) { 549 log_error("hci_send_acl_packet_buffer called without reserving packet buffer"); 550 return 0; 551 } 552 553 uint8_t * packet = hci_stack->hci_packet_buffer; 554 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); // same for ACL and SCO 555 556 // check for free places on Bluetooth module 557 if (!hci_can_send_prepared_sco_packet_now(con_handle)) { 558 log_error("hci_send_sco_packet_buffer called but no free ACL buffers on controller"); 559 hci_release_packet_buffer(); 560 return BTSTACK_ACL_BUFFERS_FULL; 561 } 562 563 // track send packet in connection struct 564 hci_connection_t *connection = hci_connection_for_handle( con_handle); 565 if (!connection) { 566 log_error("hci_send_sco_packet_buffer called but no connection for handle 0x%04x", con_handle); 567 hci_release_packet_buffer(); 568 return 0; 569 } 570 connection->num_sco_packets_sent++; 571 572 hci_dump_packet( HCI_SCO_DATA_PACKET, 0, packet, size); 573 return hci_stack->hci_transport->send_packet(HCI_SCO_DATA_PACKET, packet, size); 574 } 575 576 static void acl_handler(uint8_t *packet, int size){ 577 578 // log_info("acl_handler: size %u", size); 579 580 // get info 581 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 582 hci_connection_t *conn = hci_connection_for_handle(con_handle); 583 uint8_t acl_flags = READ_ACL_FLAGS(packet); 584 uint16_t acl_length = READ_ACL_LENGTH(packet); 585 586 // ignore non-registered handle 587 if (!conn){ 588 log_error( "hci.c: acl_handler called with non-registered handle %u!" , con_handle); 589 return; 590 } 591 592 // assert packet is complete 593 if (acl_length + 4 != size){ 594 log_error("hci.c: acl_handler called with ACL packet of wrong size %u, expected %u => dropping packet", size, acl_length + 4); 595 return; 596 } 597 598 // update idle timestamp 599 hci_connection_timestamp(conn); 600 601 // handle different packet types 602 switch (acl_flags & 0x03) { 603 604 case 0x01: // continuation fragment 605 606 // sanity checks 607 if (conn->acl_recombination_pos == 0) { 608 log_error( "ACL Cont Fragment but no first fragment for handle 0x%02x", con_handle); 609 return; 610 } 611 if (conn->acl_recombination_pos + acl_length > 4 + HCI_ACL_BUFFER_SIZE){ 612 log_error( "ACL Cont Fragment to large: combined packet %u > buffer size %u for handle 0x%02x", 613 conn->acl_recombination_pos + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle); 614 conn->acl_recombination_pos = 0; 615 return; 616 } 617 618 // append fragment payload (header already stored) 619 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE + conn->acl_recombination_pos], &packet[4], acl_length ); 620 conn->acl_recombination_pos += acl_length; 621 622 // log_error( "ACL Cont Fragment: acl_len %u, combined_len %u, l2cap_len %u", acl_length, 623 // conn->acl_recombination_pos, conn->acl_recombination_length); 624 625 // forward complete L2CAP packet if complete. 626 if (conn->acl_recombination_pos >= conn->acl_recombination_length + 4 + 4){ // pos already incl. ACL header 627 628 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, &conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], conn->acl_recombination_pos); 629 // reset recombination buffer 630 conn->acl_recombination_length = 0; 631 conn->acl_recombination_pos = 0; 632 } 633 break; 634 635 case 0x02: { // first fragment 636 637 // sanity check 638 if (conn->acl_recombination_pos) { 639 log_error( "ACL First Fragment but data in buffer for handle 0x%02x, dropping stale fragments", con_handle); 640 conn->acl_recombination_pos = 0; 641 } 642 643 // peek into L2CAP packet! 644 uint16_t l2cap_length = READ_L2CAP_LENGTH( packet ); 645 646 // log_info( "ACL First Fragment: acl_len %u, l2cap_len %u", acl_length, l2cap_length); 647 648 // compare fragment size to L2CAP packet size 649 if (acl_length >= l2cap_length + 4){ 650 651 // forward fragment as L2CAP packet 652 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, packet, acl_length + 4); 653 654 } else { 655 656 if (acl_length > HCI_ACL_BUFFER_SIZE){ 657 log_error( "ACL First Fragment to large: fragment %u > buffer size %u for handle 0x%02x", 658 4 + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle); 659 return; 660 } 661 662 // store first fragment and tweak acl length for complete package 663 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], packet, acl_length + 4); 664 conn->acl_recombination_pos = acl_length + 4; 665 conn->acl_recombination_length = l2cap_length; 666 bt_store_16(conn->acl_recombination_buffer, HCI_INCOMING_PRE_BUFFER_SIZE + 2, l2cap_length +4); 667 } 668 break; 669 670 } 671 default: 672 log_error( "hci.c: acl_handler called with invalid packet boundary flags %u", acl_flags & 0x03); 673 return; 674 } 675 676 // execute main loop 677 hci_run(); 678 } 679 680 static void hci_shutdown_connection(hci_connection_t *conn){ 681 log_info("Connection closed: handle 0x%x, %s", conn->con_handle, bd_addr_to_str(conn->address)); 682 683 run_loop_remove_timer(&conn->timeout); 684 685 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 686 btstack_memory_hci_connection_free( conn ); 687 688 // now it's gone 689 hci_emit_nr_connections_changed(); 690 } 691 692 static const uint16_t packet_type_sizes[] = { 693 0, HCI_ACL_2DH1_SIZE, HCI_ACL_3DH1_SIZE, HCI_ACL_DM1_SIZE, 694 HCI_ACL_DH1_SIZE, 0, 0, 0, 695 HCI_ACL_2DH3_SIZE, HCI_ACL_3DH3_SIZE, HCI_ACL_DM3_SIZE, HCI_ACL_DH3_SIZE, 696 HCI_ACL_2DH5_SIZE, HCI_ACL_3DH5_SIZE, HCI_ACL_DM5_SIZE, HCI_ACL_DH5_SIZE 697 }; 698 static const uint8_t packet_type_feature_requirement_bit[] = { 699 0, // 3 slot packets 700 1, // 5 slot packets 701 25, // EDR 2 mpbs 702 26, // EDR 3 mbps 703 39, // 3 slot EDR packts 704 40, // 5 slot EDR packet 705 }; 706 static const uint16_t packet_type_feature_packet_mask[] = { 707 0x0f00, // 3 slot packets 708 0xf000, // 5 slot packets 709 0x1102, // EDR 2 mpbs 710 0x2204, // EDR 3 mbps 711 0x0300, // 3 slot EDR packts 712 0x3000, // 5 slot EDR packet 713 }; 714 715 static uint16_t hci_acl_packet_types_for_buffer_size_and_local_features(uint16_t buffer_size, uint8_t * local_supported_features){ 716 // enable packet types based on size 717 uint16_t packet_types = 0; 718 unsigned int i; 719 for (i=0;i<16;i++){ 720 if (packet_type_sizes[i] == 0) continue; 721 if (packet_type_sizes[i] <= buffer_size){ 722 packet_types |= 1 << i; 723 } 724 } 725 // disable packet types due to missing local supported features 726 for (i=0;i<sizeof(packet_type_feature_requirement_bit);i++){ 727 int bit_idx = packet_type_feature_requirement_bit[i]; 728 int feature_set = (local_supported_features[bit_idx >> 3] & (1<<(bit_idx & 7))) != 0; 729 if (feature_set) continue; 730 log_info("Features bit %02u is not set, removing packet types 0x%04x", bit_idx, packet_type_feature_packet_mask[i]); 731 packet_types &= ~packet_type_feature_packet_mask[i]; 732 } 733 // flip bits for "may not be used" 734 packet_types ^= 0x3306; 735 return packet_types; 736 } 737 738 uint16_t hci_usable_acl_packet_types(void){ 739 return hci_stack->packet_types; 740 } 741 742 uint8_t* hci_get_outgoing_packet_buffer(void){ 743 // hci packet buffer is >= acl data packet length 744 return hci_stack->hci_packet_buffer; 745 } 746 747 uint16_t hci_max_acl_data_packet_length(void){ 748 return hci_stack->acl_data_packet_length; 749 } 750 751 int hci_non_flushable_packet_boundary_flag_supported(void){ 752 // No. 54, byte 6, bit 6 753 return (hci_stack->local_supported_features[6] & (1 << 6)) != 0; 754 } 755 756 int hci_ssp_supported(void){ 757 // No. 51, byte 6, bit 3 758 return (hci_stack->local_supported_features[6] & (1 << 3)) != 0; 759 } 760 761 int hci_classic_supported(void){ 762 // No. 37, byte 4, bit 5, = No BR/EDR Support 763 return (hci_stack->local_supported_features[4] & (1 << 5)) == 0; 764 } 765 766 int hci_le_supported(void){ 767 #ifdef HAVE_BLE 768 // No. 37, byte 4, bit 6 = LE Supported (Controller) 769 return (hci_stack->local_supported_features[4] & (1 << 6)) != 0; 770 #else 771 return 0; 772 #endif 773 } 774 775 // get addr type and address used in advertisement packets 776 void hci_le_advertisement_address(uint8_t * addr_type, bd_addr_t addr){ 777 *addr_type = hci_stack->adv_addr_type; 778 if (hci_stack->adv_addr_type){ 779 memcpy(addr, hci_stack->adv_address, 6); 780 } else { 781 memcpy(addr, hci_stack->local_bd_addr, 6); 782 } 783 } 784 785 #ifdef HAVE_BLE 786 void le_handle_advertisement_report(uint8_t *packet, int size){ 787 int offset = 3; 788 int num_reports = packet[offset]; 789 offset += 1; 790 791 int i; 792 log_info("HCI: handle adv report with num reports: %d", num_reports); 793 uint8_t event[12 + LE_ADVERTISING_DATA_SIZE]; // use upper bound to avoid var size automatic var 794 for (i=0; i<num_reports;i++){ 795 uint8_t data_length = packet[offset + 8]; 796 uint8_t event_size = 10 + data_length; 797 int pos = 0; 798 event[pos++] = GAP_LE_ADVERTISING_REPORT; 799 event[pos++] = event_size; 800 memcpy(&event[pos], &packet[offset], 1+1+6); // event type + address type + address 801 offset += 8; 802 pos += 8; 803 event[pos++] = packet[offset + 1 + data_length]; // rssi 804 event[pos++] = packet[offset++]; //data_length; 805 memcpy(&event[pos], &packet[offset], data_length); 806 pos += data_length; 807 offset += data_length + 1; // rssi 808 hci_dump_packet( HCI_EVENT_PACKET, 0, event, pos); 809 hci_stack->packet_handler(HCI_EVENT_PACKET, event, pos); 810 } 811 } 812 #endif 813 814 static void hci_initializing_next_state(){ 815 hci_stack->substate = (hci_init_state_t )( ((int) hci_stack->substate) + 1); 816 } 817 818 static void hci_initializing_event_handler(uint8_t * packet, uint16_t size){ 819 uint8_t command_completed = 0; 820 if ((hci_stack->substate % 2) == 0) return; 821 // odd: waiting for event 822 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 823 uint16_t opcode = READ_BT_16(packet,3); 824 if (opcode == hci_stack->last_cmd_opcode){ 825 command_completed = 1; 826 log_info("Command complete for expected opcode %04x -> new substate %u", opcode, hci_stack->substate >> 1); 827 } else { 828 log_info("Command complete for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 829 } 830 } 831 if (packet[0] == HCI_EVENT_COMMAND_STATUS){ 832 uint8_t status = packet[2]; 833 uint16_t opcode = READ_BT_16(packet,4); 834 if (opcode == hci_stack->last_cmd_opcode){ 835 if (status){ 836 command_completed = 1; 837 log_error("Command status error 0x%02x for expected opcode %04x -> new substate %u", status, opcode, hci_stack->substate >> 1); 838 } else { 839 log_info("Command status OK for expected opcode %04x, waiting for command complete", opcode); 840 } 841 } else { 842 log_info("Command status for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 843 } 844 } 845 846 if (!command_completed) return; 847 848 switch(hci_stack->substate >> 1){ 849 default: 850 hci_initializing_next_state(); 851 break; 852 } 853 } 854 855 static void hci_initializing_state_machine(){ 856 if (hci_stack->substate % 2) { 857 // odd: waiting for command completion 858 return; 859 } 860 // log_info("hci_init: substate %u", hci_stack->substate >> 1); 861 switch (hci_stack->substate){ 862 case HCI_INIT_SEND_RESET: 863 hci_state_reset(); 864 865 hci_send_cmd(&hci_reset); 866 if (hci_stack->config == NULL || ((hci_uart_config_t *)hci_stack->config)->baudrate_main == 0){ 867 // skip baud change 868 hci_stack->substate = HCI_INIT_LOCAL_BAUD_CHANGE; // to end up at HCI_INIT_SET_BD_ADDR 869 } 870 break; 871 case HCI_INIT_SEND_BAUD_CHANGE: 872 hci_stack->control->baudrate_cmd(hci_stack->config, ((hci_uart_config_t *)hci_stack->config)->baudrate_main, hci_stack->hci_packet_buffer); 873 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 874 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 875 break; 876 case HCI_INIT_LOCAL_BAUD_CHANGE: 877 log_info("Local baud rate change"); 878 hci_stack->hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack->config)->baudrate_main); 879 hci_stack->substate = HCI_INIT_SET_BD_ADDR; 880 // break missing here for fall through 881 882 case HCI_INIT_SET_BD_ADDR: 883 if ( hci_stack->custom_bd_addr_set && hci_stack->control && hci_stack->control->set_bd_addr_cmd){ 884 log_info("Set Public BD ADDR to %s", bd_addr_to_str(hci_stack->custom_bd_addr)); 885 hci_stack->control->set_bd_addr_cmd(hci_stack->config, hci_stack->custom_bd_addr, hci_stack->hci_packet_buffer); 886 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 887 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 888 break; 889 } 890 hci_stack->substate = HCI_INIT_CUSTOM_INIT; 891 // break missing here for fall through 892 893 case HCI_INIT_CUSTOM_INIT: 894 log_info("Custom init"); 895 // Custom initialization 896 if (hci_stack->control && hci_stack->control->next_cmd){ 897 int valid_cmd = (*hci_stack->control->next_cmd)(hci_stack->config, hci_stack->hci_packet_buffer); 898 if (valid_cmd){ 899 int size = 3 + hci_stack->hci_packet_buffer[2]; 900 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 901 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, hci_stack->hci_packet_buffer, size); 902 hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack->hci_packet_buffer, size); 903 hci_stack->substate = 3 << 1; // more init commands 904 break; 905 } 906 log_info("hci_run: init script done"); 907 } 908 // otherwise continue 909 hci_send_cmd(&hci_read_bd_addr); 910 break; 911 case HCI_INIT_READ_BUFFER_SIZE: 912 hci_send_cmd(&hci_read_buffer_size); 913 break; 914 case HCI_INIT_READ_LOCAL_SUPPORTED_FEATUES: 915 hci_send_cmd(&hci_read_local_supported_features); 916 break; 917 case HCI_INIT_SET_EVENT_MASK: 918 if (hci_le_supported()){ 919 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 920 } else { 921 // Kensington Bluetooth 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 922 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 923 } 924 925 // skip Classic init commands for LE only chipsets 926 if (!hci_classic_supported()){ 927 if (hci_le_supported()){ 928 hci_stack->substate = HCI_INIT_WRITE_SCAN_ENABLE; // skip all classic command 929 } else { 930 log_error("Neither BR/EDR nor LE supported"); 931 hci_stack->substate = HCI_INIT_LE_SET_SCAN_PARAMETERS; // skip all 932 } 933 } 934 break; 935 case HCI_INIT_WRITE_SIMPLE_PAIRING_MODE: 936 if (hci_ssp_supported()){ 937 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack->ssp_enable); 938 break; 939 } 940 hci_stack->substate = HCI_INIT_WRITE_PAGE_TIMEOUT; 941 // break missing here for fall through 942 943 case HCI_INIT_WRITE_PAGE_TIMEOUT: 944 hci_send_cmd(&hci_write_page_timeout, 0x6000); // ca. 15 sec 945 break; 946 case HCI_INIT_WRITE_CLASS_OF_DEVICE: 947 hci_send_cmd(&hci_write_class_of_device, hci_stack->class_of_device); 948 break; 949 950 case HCI_INIT_WRITE_LOCAL_NAME: 951 if (hci_stack->local_name){ 952 hci_send_cmd(&hci_write_local_name, hci_stack->local_name); 953 } else { 954 char hostname[30]; 955 #ifdef EMBEDDED 956 // BTstack-11:22:33:44:55:66 957 strcpy(hostname, "BTstack "); 958 strcat(hostname, bd_addr_to_str(hci_stack->local_bd_addr)); 959 log_info("---> Name %s", hostname); 960 #else 961 // hostname for POSIX systems 962 gethostname(hostname, 30); 963 hostname[29] = '\0'; 964 #endif 965 hci_send_cmd(&hci_write_local_name, hostname); 966 } 967 break; 968 case HCI_INIT_WRITE_SCAN_ENABLE: 969 hci_send_cmd(&hci_write_scan_enable, (hci_stack->connectable << 1) | hci_stack->discoverable); // page scan 970 if (!hci_le_supported()){ 971 // SKIP LE init for Classic only configuration 972 hci_stack->substate = HCI_INIT_LE_SET_SCAN_PARAMETERS; 973 } 974 break; 975 976 #ifdef HAVE_BLE 977 // LE INIT 978 case HCI_INIT_LE_READ_BUFFER_SIZE: 979 hci_send_cmd(&hci_le_read_buffer_size); 980 break; 981 case HCI_INIT_WRITE_LE_HOST_SUPPORTED: 982 // LE Supported Host = 1, Simultaneous Host = 0 983 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 984 break; 985 case HCI_INIT_LE_SET_SCAN_PARAMETERS: 986 // LE Scan Parameters: active scanning, 300 ms interval, 30 ms window, public address, accept all advs 987 hci_send_cmd(&hci_le_set_scan_parameters, 1, 0x1e0, 0x30, 0, 0); 988 break; 989 #endif 990 991 // DONE 992 case HCI_INIT_DONE: 993 // done. 994 hci_stack->state = HCI_STATE_WORKING; 995 hci_emit_state(); 996 break; 997 default: 998 break; 999 } 1000 hci_initializing_next_state(); 1001 } 1002 1003 // avoid huge local variables 1004 #ifndef EMBEDDED 1005 static device_name_t device_name; 1006 #endif 1007 static void event_handler(uint8_t *packet, int size){ 1008 1009 uint16_t event_length = packet[1]; 1010 1011 // assert packet is complete 1012 if (size != event_length + 2){ 1013 log_error("hci.c: event_handler called with event packet of wrong size %u, expected %u => dropping packet", size, event_length + 2); 1014 return; 1015 } 1016 1017 bd_addr_t addr; 1018 bd_addr_type_t addr_type; 1019 uint8_t link_type; 1020 hci_con_handle_t handle; 1021 hci_connection_t * conn; 1022 int i; 1023 1024 // log_info("HCI:EVENT:%02x", packet[0]); 1025 1026 switch (packet[0]) { 1027 1028 case HCI_EVENT_COMMAND_COMPLETE: 1029 // get num cmd packets 1030 // log_info("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u", hci_stack->num_cmd_packets, packet[2]); 1031 hci_stack->num_cmd_packets = packet[2]; 1032 1033 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 1034 // from offset 5 1035 // status 1036 // "The HC_ACL_Data_Packet_Length return parameter will be used to determine the size of the L2CAP segments contained in ACL Data Packets" 1037 hci_stack->acl_data_packet_length = READ_BT_16(packet, 6); 1038 hci_stack->sco_data_packet_length = packet[8]; 1039 hci_stack->acl_packets_total_num = READ_BT_16(packet, 9); 1040 hci_stack->sco_packets_total_num = READ_BT_16(packet, 11); 1041 1042 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1043 // determine usable ACL payload size 1044 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->acl_data_packet_length){ 1045 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1046 } 1047 log_info("hci_read_buffer_size: acl used size %u, count %u / sco size %u, count %u", 1048 hci_stack->acl_data_packet_length, hci_stack->acl_packets_total_num, 1049 hci_stack->sco_data_packet_length, hci_stack->sco_packets_total_num); 1050 } 1051 } 1052 #ifdef HAVE_BLE 1053 if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_buffer_size)){ 1054 hci_stack->le_data_packets_length = READ_BT_16(packet, 6); 1055 hci_stack->le_acl_packets_total_num = packet[8]; 1056 // determine usable ACL payload size 1057 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->le_data_packets_length){ 1058 hci_stack->le_data_packets_length = HCI_ACL_PAYLOAD_SIZE; 1059 } 1060 log_info("hci_le_read_buffer_size: size %u, count %u", hci_stack->le_data_packets_length, hci_stack->le_acl_packets_total_num); 1061 } 1062 #endif 1063 // Dump local address 1064 if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)) { 1065 bt_flip_addr(hci_stack->local_bd_addr, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1]); 1066 log_info("Local Address, Status: 0x%02x: Addr: %s", 1067 packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE], bd_addr_to_str(hci_stack->local_bd_addr)); 1068 } 1069 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1070 hci_emit_discoverable_enabled(hci_stack->discoverable); 1071 } 1072 // Note: HCI init checks 1073 if (COMMAND_COMPLETE_EVENT(packet, hci_read_local_supported_features)){ 1074 memcpy(hci_stack->local_supported_features, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1], 8); 1075 log_info("Local Supported Features: 0x%02x%02x%02x%02x%02x%02x%02x%02x", 1076 hci_stack->local_supported_features[0], hci_stack->local_supported_features[1], 1077 hci_stack->local_supported_features[2], hci_stack->local_supported_features[3], 1078 hci_stack->local_supported_features[4], hci_stack->local_supported_features[5], 1079 hci_stack->local_supported_features[6], hci_stack->local_supported_features[7]); 1080 1081 // determine usable ACL packet types based on host buffer size and supported features 1082 hci_stack->packet_types = hci_acl_packet_types_for_buffer_size_and_local_features(HCI_ACL_PAYLOAD_SIZE, &hci_stack->local_supported_features[0]); 1083 log_info("packet types %04x", hci_stack->packet_types); 1084 1085 // Classic/LE 1086 log_info("BR/EDR support %u, LE support %u", hci_classic_supported(), hci_le_supported()); 1087 } 1088 break; 1089 1090 case HCI_EVENT_COMMAND_STATUS: 1091 // get num cmd packets 1092 // log_info("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u", hci_stack->num_cmd_packets, packet[3]); 1093 hci_stack->num_cmd_packets = packet[3]; 1094 break; 1095 1096 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:{ 1097 int offset = 3; 1098 for (i=0; i<packet[2];i++){ 1099 handle = READ_BT_16(packet, offset); 1100 offset += 2; 1101 uint16_t num_packets = READ_BT_16(packet, offset); 1102 offset += 2; 1103 1104 conn = hci_connection_for_handle(handle); 1105 if (!conn){ 1106 log_error("hci_number_completed_packet lists unused con handle %u", handle); 1107 continue; 1108 } 1109 1110 if (conn->address_type == BD_ADDR_TYPE_SCO){ 1111 if (conn->num_sco_packets_sent >= num_packets){ 1112 conn->num_sco_packets_sent -= num_packets; 1113 } else { 1114 log_error("hci_number_completed_packets, more sco slots freed then sent."); 1115 conn->num_sco_packets_sent = 0; 1116 } 1117 1118 } else { 1119 if (conn->num_acl_packets_sent >= num_packets){ 1120 conn->num_acl_packets_sent -= num_packets; 1121 } else { 1122 log_error("hci_number_completed_packets, more acl slots freed then sent."); 1123 conn->num_acl_packets_sent = 0; 1124 } 1125 } 1126 // log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u", num_packets, handle, conn->num_acl_packets_sent); 1127 } 1128 break; 1129 } 1130 case HCI_EVENT_CONNECTION_REQUEST: 1131 bt_flip_addr(addr, &packet[2]); 1132 // TODO: eval COD 8-10 1133 link_type = packet[11]; 1134 log_info("Connection_incoming: %s, type %u", bd_addr_to_str(addr), link_type); 1135 addr_type = link_type == 1 ? BD_ADDR_TYPE_CLASSIC : BD_ADDR_TYPE_SCO; 1136 conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 1137 if (!conn) { 1138 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 1139 } 1140 if (!conn) { 1141 // CONNECTION REJECTED DUE TO LIMITED RESOURCES (0X0D) 1142 hci_stack->decline_reason = 0x0d; 1143 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1144 break; 1145 } 1146 conn->state = RECEIVED_CONNECTION_REQUEST; 1147 hci_run(); 1148 break; 1149 1150 case HCI_EVENT_CONNECTION_COMPLETE: 1151 // Connection management 1152 bt_flip_addr(addr, &packet[5]); 1153 log_info("Connection_complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 1154 addr_type = BD_ADDR_TYPE_CLASSIC; 1155 conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 1156 if (conn) { 1157 if (!packet[2]){ 1158 conn->state = OPEN; 1159 conn->con_handle = READ_BT_16(packet, 3); 1160 conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES; 1161 1162 // restart timer 1163 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1164 run_loop_add_timer(&conn->timeout); 1165 1166 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1167 1168 hci_emit_nr_connections_changed(); 1169 } else { 1170 int notify_dedicated_bonding_failed = conn->bonding_flags & BONDING_DEDICATED; 1171 uint8_t status = packet[2]; 1172 bd_addr_t bd_address; 1173 memcpy(&bd_address, conn->address, 6); 1174 1175 // connection failed, remove entry 1176 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1177 btstack_memory_hci_connection_free( conn ); 1178 1179 // notify client if dedicated bonding 1180 if (notify_dedicated_bonding_failed){ 1181 log_info("hci notify_dedicated_bonding_failed"); 1182 hci_emit_dedicated_bonding_result(bd_address, status); 1183 } 1184 1185 // if authentication error, also delete link key 1186 if (packet[2] == 0x05) { 1187 hci_drop_link_key_for_bd_addr(addr); 1188 } 1189 } 1190 } 1191 break; 1192 1193 case HCI_EVENT_SYNCHRONOUS_CONNECTION_COMPLETE: 1194 bt_flip_addr(addr, &packet[5]); 1195 log_info("Synchronous Connection Complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 1196 if (packet[2]){ 1197 // connection failed 1198 break; 1199 } 1200 conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_SCO); 1201 if (!conn) { 1202 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_SCO); 1203 } 1204 if (!conn) { 1205 break; 1206 } 1207 conn->state = OPEN; 1208 conn->con_handle = READ_BT_16(packet, 3); 1209 break; 1210 1211 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 1212 handle = READ_BT_16(packet, 3); 1213 conn = hci_connection_for_handle(handle); 1214 if (!conn) break; 1215 if (!packet[2]){ 1216 uint8_t * features = &packet[5]; 1217 if (features[6] & (1 << 3)){ 1218 conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP; 1219 } 1220 } 1221 conn->bonding_flags |= BONDING_RECEIVED_REMOTE_FEATURES; 1222 log_info("HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE, bonding flags %x", conn->bonding_flags); 1223 if (conn->bonding_flags & BONDING_DEDICATED){ 1224 conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 1225 } 1226 break; 1227 1228 case HCI_EVENT_LINK_KEY_REQUEST: 1229 log_info("HCI_EVENT_LINK_KEY_REQUEST"); 1230 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 1231 // non-bondable mode: link key negative reply will be sent by HANDLE_LINK_KEY_REQUEST 1232 if (hci_stack->bondable && !hci_stack->remote_device_db) break; 1233 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], HANDLE_LINK_KEY_REQUEST); 1234 hci_run(); 1235 // request handled by hci_run() as HANDLE_LINK_KEY_REQUEST gets set 1236 return; 1237 1238 case HCI_EVENT_LINK_KEY_NOTIFICATION: { 1239 bt_flip_addr(addr, &packet[2]); 1240 conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 1241 if (!conn) break; 1242 conn->authentication_flags |= RECV_LINK_KEY_NOTIFICATION; 1243 link_key_type_t link_key_type = (link_key_type_t)packet[24]; 1244 // Change Connection Encryption keeps link key type 1245 if (link_key_type != CHANGED_COMBINATION_KEY){ 1246 conn->link_key_type = link_key_type; 1247 } 1248 if (!hci_stack->remote_device_db) break; 1249 hci_stack->remote_device_db->put_link_key(addr, &packet[8], conn->link_key_type); 1250 // still forward event to allow dismiss of pairing dialog 1251 break; 1252 } 1253 1254 case HCI_EVENT_PIN_CODE_REQUEST: 1255 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], LEGACY_PAIRING_ACTIVE); 1256 // non-bondable mode: pin code negative reply will be sent 1257 if (!hci_stack->bondable){ 1258 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], DENY_PIN_CODE_REQUEST); 1259 hci_run(); 1260 return; 1261 } 1262 // PIN CODE REQUEST means the link key request didn't succee -> delete stored link key 1263 if (!hci_stack->remote_device_db) break; 1264 bt_flip_addr(addr, &packet[2]); 1265 hci_stack->remote_device_db->delete_link_key(addr); 1266 break; 1267 1268 case HCI_EVENT_IO_CAPABILITY_REQUEST: 1269 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_IO_CAPABILITIES_REQUEST); 1270 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_IO_CAPABILITIES_REPLY); 1271 break; 1272 1273 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 1274 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1275 if (!hci_stack->ssp_auto_accept) break; 1276 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_CONFIRM_REPLY); 1277 break; 1278 1279 case HCI_EVENT_USER_PASSKEY_REQUEST: 1280 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1281 if (!hci_stack->ssp_auto_accept) break; 1282 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_PASSKEY_REPLY); 1283 break; 1284 1285 case HCI_EVENT_ENCRYPTION_CHANGE: 1286 handle = READ_BT_16(packet, 3); 1287 conn = hci_connection_for_handle(handle); 1288 if (!conn) break; 1289 if (packet[2] == 0) { 1290 if (packet[5]){ 1291 conn->authentication_flags |= CONNECTION_ENCRYPTED; 1292 } else { 1293 conn->authentication_flags &= ~CONNECTION_ENCRYPTED; 1294 } 1295 } 1296 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1297 break; 1298 1299 case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT: 1300 handle = READ_BT_16(packet, 3); 1301 conn = hci_connection_for_handle(handle); 1302 if (!conn) break; 1303 1304 // dedicated bonding: send result and disconnect 1305 if (conn->bonding_flags & BONDING_DEDICATED){ 1306 conn->bonding_flags &= ~BONDING_DEDICATED; 1307 conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE; 1308 conn->bonding_status = packet[2]; 1309 break; 1310 } 1311 1312 if (packet[2] == 0 && gap_security_level_for_link_key_type(conn->link_key_type) >= conn->requested_security_level){ 1313 // link key sufficient for requested security 1314 conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 1315 break; 1316 } 1317 // not enough 1318 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1319 break; 1320 1321 #ifndef EMBEDDED 1322 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 1323 if (!hci_stack->remote_device_db) break; 1324 if (packet[2]) break; // status not ok 1325 bt_flip_addr(addr, &packet[3]); 1326 // fix for invalid remote names - terminate on 0xff 1327 for (i=0; i<248;i++){ 1328 if (packet[9+i] == 0xff){ 1329 packet[9+i] = 0; 1330 break; 1331 } 1332 } 1333 memset(&device_name, 0, sizeof(device_name_t)); 1334 strncpy((char*) device_name, (char*) &packet[9], 248); 1335 hci_stack->remote_device_db->put_name(addr, &device_name); 1336 break; 1337 1338 case HCI_EVENT_INQUIRY_RESULT: 1339 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:{ 1340 if (!hci_stack->remote_device_db) break; 1341 // first send inq result packet 1342 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1343 // then send cached remote names 1344 int offset = 3; 1345 for (i=0; i<packet[2];i++){ 1346 bt_flip_addr(addr, &packet[offset]); 1347 offset += 14; // 6 + 1 + 1 + 1 + 3 + 2; 1348 if (hci_stack->remote_device_db->get_name(addr, &device_name)){ 1349 hci_emit_remote_name_cached(addr, &device_name); 1350 } 1351 } 1352 return; 1353 } 1354 #endif 1355 1356 // HCI_EVENT_DISCONNECTION_COMPLETE 1357 // has been split, to first notify stack before shutting connection down 1358 // see end of function, too. 1359 case HCI_EVENT_DISCONNECTION_COMPLETE: 1360 if (packet[2]) break; // status != 0 1361 handle = READ_BT_16(packet, 3); 1362 hci_connection_t * conn = hci_connection_for_handle(handle); 1363 if (!conn) break; // no conn struct anymore 1364 conn->state = RECEIVED_DISCONNECTION_COMPLETE; 1365 break; 1366 1367 case HCI_EVENT_HARDWARE_ERROR: 1368 if(hci_stack->control && hci_stack->control->hw_error){ 1369 (*hci_stack->control->hw_error)(); 1370 } else { 1371 // if no special requests, just reboot stack 1372 hci_power_control_off(); 1373 hci_power_control_on(); 1374 } 1375 break; 1376 1377 case DAEMON_EVENT_HCI_PACKET_SENT: 1378 // release packet buffer only for asynchronous transport and if there are not further fragements 1379 if (hci_transport_synchronous()) { 1380 log_error("Synchronous HCI Transport shouldn't send DAEMON_EVENT_HCI_PACKET_SENT"); 1381 return; // instead of break: to avoid re-entering hci_run() 1382 } 1383 if (hci_stack->acl_fragmentation_total_size) break; 1384 hci_release_packet_buffer(); 1385 break; 1386 1387 #ifdef HAVE_BLE 1388 case HCI_EVENT_LE_META: 1389 switch (packet[2]){ 1390 case HCI_SUBEVENT_LE_ADVERTISING_REPORT: 1391 log_info("advertising report received"); 1392 if (hci_stack->le_scanning_state != LE_SCANNING) break; 1393 le_handle_advertisement_report(packet, size); 1394 break; 1395 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 1396 // Connection management 1397 bt_flip_addr(addr, &packet[8]); 1398 addr_type = (bd_addr_type_t)packet[7]; 1399 log_info("LE Connection_complete (status=%u) type %u, %s", packet[3], addr_type, bd_addr_to_str(addr)); 1400 // LE connections are auto-accepted, so just create a connection if there isn't one already 1401 conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 1402 if (packet[3]){ 1403 if (conn){ 1404 // outgoing connection failed, remove entry 1405 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1406 btstack_memory_hci_connection_free( conn ); 1407 } 1408 // if authentication error, also delete link key 1409 if (packet[3] == 0x05) { 1410 hci_drop_link_key_for_bd_addr(addr); 1411 } 1412 break; 1413 } 1414 if (!conn){ 1415 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 1416 } 1417 if (!conn){ 1418 // no memory 1419 break; 1420 } 1421 1422 conn->state = OPEN; 1423 conn->con_handle = READ_BT_16(packet, 4); 1424 1425 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 1426 1427 // restart timer 1428 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1429 // run_loop_add_timer(&conn->timeout); 1430 1431 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1432 1433 hci_emit_nr_connections_changed(); 1434 break; 1435 1436 // log_info("LE buffer size: %u, count %u", READ_BT_16(packet,6), packet[8]); 1437 1438 default: 1439 break; 1440 } 1441 break; 1442 #endif 1443 default: 1444 break; 1445 } 1446 1447 // handle BT initialization 1448 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1449 hci_initializing_event_handler(packet, size); 1450 } 1451 1452 // help with BT sleep 1453 if (hci_stack->state == HCI_STATE_FALLING_ASLEEP 1454 && hci_stack->substate == HCI_INIT_W4_SEND_RESET 1455 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1456 hci_initializing_next_state(); 1457 } 1458 1459 // notify upper stack 1460 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1461 1462 // moved here to give upper stack a chance to close down everything with hci_connection_t intact 1463 if (packet[0] == HCI_EVENT_DISCONNECTION_COMPLETE){ 1464 if (!packet[2]){ 1465 handle = READ_BT_16(packet, 3); 1466 hci_connection_t * conn = hci_connection_for_handle(handle); 1467 if (conn) { 1468 uint8_t status = conn->bonding_status; 1469 uint16_t flags = conn->bonding_flags; 1470 bd_addr_t bd_address; 1471 memcpy(&bd_address, conn->address, 6); 1472 hci_shutdown_connection(conn); 1473 // connection struct is gone, don't access anymore 1474 if (flags & BONDING_EMIT_COMPLETE_ON_DISCONNECT){ 1475 hci_emit_dedicated_bonding_result(bd_address, status); 1476 } 1477 } 1478 } 1479 } 1480 1481 // execute main loop 1482 hci_run(); 1483 } 1484 1485 static void sco_handler(uint8_t * packet, uint16_t size){ 1486 // not handled yet 1487 } 1488 1489 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1490 hci_dump_packet(packet_type, 1, packet, size); 1491 switch (packet_type) { 1492 case HCI_EVENT_PACKET: 1493 event_handler(packet, size); 1494 break; 1495 case HCI_ACL_DATA_PACKET: 1496 acl_handler(packet, size); 1497 break; 1498 case HCI_SCO_DATA_PACKET: 1499 sco_handler(packet, size); 1500 default: 1501 break; 1502 } 1503 } 1504 1505 /** Register HCI packet handlers */ 1506 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 1507 hci_stack->packet_handler = handler; 1508 } 1509 1510 static void hci_state_reset(){ 1511 // no connections yet 1512 hci_stack->connections = NULL; 1513 1514 // keep discoverable/connectable as this has been requested by the client(s) 1515 // hci_stack->discoverable = 0; 1516 // hci_stack->connectable = 0; 1517 // hci_stack->bondable = 1; 1518 1519 // buffer is free 1520 hci_stack->hci_packet_buffer_reserved = 0; 1521 1522 // no pending cmds 1523 hci_stack->decline_reason = 0; 1524 hci_stack->new_scan_enable_value = 0xff; 1525 1526 // LE 1527 hci_stack->adv_addr_type = 0; 1528 memset(hci_stack->adv_address, 0, 6); 1529 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1530 hci_stack->le_scan_type = 0xff; 1531 hci_stack->le_connection_parameter_range.le_conn_interval_min = 0x0006; 1532 hci_stack->le_connection_parameter_range.le_conn_interval_max = 0x0C80; 1533 hci_stack->le_connection_parameter_range.le_conn_latency_min = 0x0000; 1534 hci_stack->le_connection_parameter_range.le_conn_latency_max = 0x03E8; 1535 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = 0x000A; 1536 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = 0x0C80; 1537 } 1538 1539 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 1540 1541 #ifdef HAVE_MALLOC 1542 if (!hci_stack) { 1543 hci_stack = (hci_stack_t*) malloc(sizeof(hci_stack_t)); 1544 } 1545 #else 1546 hci_stack = &hci_stack_static; 1547 #endif 1548 memset(hci_stack, 0, sizeof(hci_stack_t)); 1549 1550 // reference to use transport layer implementation 1551 hci_stack->hci_transport = transport; 1552 1553 // references to used control implementation 1554 hci_stack->control = control; 1555 1556 // reference to used config 1557 hci_stack->config = config; 1558 1559 // higher level handler 1560 hci_stack->packet_handler = dummy_handler; 1561 1562 // store and open remote device db 1563 hci_stack->remote_device_db = remote_device_db; 1564 if (hci_stack->remote_device_db) { 1565 hci_stack->remote_device_db->open(); 1566 } 1567 1568 // max acl payload size defined in config.h 1569 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1570 1571 // register packet handlers with transport 1572 transport->register_packet_handler(&packet_handler); 1573 1574 hci_stack->state = HCI_STATE_OFF; 1575 1576 // class of device 1577 hci_stack->class_of_device = 0x007a020c; // Smartphone 1578 1579 // bondable by default 1580 hci_stack->bondable = 1; 1581 1582 // Secure Simple Pairing default: enable, no I/O capabilities, general bonding, mitm not required, auto accept 1583 hci_stack->ssp_enable = 1; 1584 hci_stack->ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 1585 hci_stack->ssp_authentication_requirement = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING; 1586 hci_stack->ssp_auto_accept = 1; 1587 1588 hci_state_reset(); 1589 } 1590 1591 void hci_close(){ 1592 // close remote device db 1593 if (hci_stack->remote_device_db) { 1594 hci_stack->remote_device_db->close(); 1595 } 1596 while (hci_stack->connections) { 1597 // cancel all l2cap connections 1598 hci_emit_disconnection_complete(((hci_connection_t *) hci_stack->connections)->con_handle, 0x16); // terminated by local host 1599 hci_shutdown_connection((hci_connection_t *) hci_stack->connections); 1600 } 1601 hci_power_control(HCI_POWER_OFF); 1602 1603 #ifdef HAVE_MALLOC 1604 free(hci_stack); 1605 #endif 1606 hci_stack = NULL; 1607 } 1608 1609 void hci_set_class_of_device(uint32_t class_of_device){ 1610 hci_stack->class_of_device = class_of_device; 1611 } 1612 1613 // Set Public BD ADDR - passed on to Bluetooth chipset if supported in bt_control_h 1614 void hci_set_bd_addr(bd_addr_t addr){ 1615 memcpy(hci_stack->custom_bd_addr, addr, 6); 1616 hci_stack->custom_bd_addr_set = 1; 1617 } 1618 1619 void hci_disable_l2cap_timeout_check(){ 1620 disable_l2cap_timeouts = 1; 1621 } 1622 // State-Module-Driver overview 1623 // state module low-level 1624 // HCI_STATE_OFF off close 1625 // HCI_STATE_INITIALIZING, on open 1626 // HCI_STATE_WORKING, on open 1627 // HCI_STATE_HALTING, on open 1628 // HCI_STATE_SLEEPING, off/sleep close 1629 // HCI_STATE_FALLING_ASLEEP on open 1630 1631 static int hci_power_control_on(void){ 1632 1633 // power on 1634 int err = 0; 1635 if (hci_stack->control && hci_stack->control->on){ 1636 err = (*hci_stack->control->on)(hci_stack->config); 1637 } 1638 if (err){ 1639 log_error( "POWER_ON failed"); 1640 hci_emit_hci_open_failed(); 1641 return err; 1642 } 1643 1644 // open low-level device 1645 err = hci_stack->hci_transport->open(hci_stack->config); 1646 if (err){ 1647 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1648 if (hci_stack->control && hci_stack->control->off){ 1649 (*hci_stack->control->off)(hci_stack->config); 1650 } 1651 hci_emit_hci_open_failed(); 1652 return err; 1653 } 1654 return 0; 1655 } 1656 1657 static void hci_power_control_off(void){ 1658 1659 log_info("hci_power_control_off"); 1660 1661 // close low-level device 1662 hci_stack->hci_transport->close(hci_stack->config); 1663 1664 log_info("hci_power_control_off - hci_transport closed"); 1665 1666 // power off 1667 if (hci_stack->control && hci_stack->control->off){ 1668 (*hci_stack->control->off)(hci_stack->config); 1669 } 1670 1671 log_info("hci_power_control_off - control closed"); 1672 1673 hci_stack->state = HCI_STATE_OFF; 1674 } 1675 1676 static void hci_power_control_sleep(void){ 1677 1678 log_info("hci_power_control_sleep"); 1679 1680 #if 0 1681 // don't close serial port during sleep 1682 1683 // close low-level device 1684 hci_stack->hci_transport->close(hci_stack->config); 1685 #endif 1686 1687 // sleep mode 1688 if (hci_stack->control && hci_stack->control->sleep){ 1689 (*hci_stack->control->sleep)(hci_stack->config); 1690 } 1691 1692 hci_stack->state = HCI_STATE_SLEEPING; 1693 } 1694 1695 static int hci_power_control_wake(void){ 1696 1697 log_info("hci_power_control_wake"); 1698 1699 // wake on 1700 if (hci_stack->control && hci_stack->control->wake){ 1701 (*hci_stack->control->wake)(hci_stack->config); 1702 } 1703 1704 #if 0 1705 // open low-level device 1706 int err = hci_stack->hci_transport->open(hci_stack->config); 1707 if (err){ 1708 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1709 if (hci_stack->control && hci_stack->control->off){ 1710 (*hci_stack->control->off)(hci_stack->config); 1711 } 1712 hci_emit_hci_open_failed(); 1713 return err; 1714 } 1715 #endif 1716 1717 return 0; 1718 } 1719 1720 static void hci_power_transition_to_initializing(void){ 1721 // set up state machine 1722 hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent 1723 hci_stack->hci_packet_buffer_reserved = 0; 1724 hci_stack->state = HCI_STATE_INITIALIZING; 1725 hci_stack->substate = HCI_INIT_SEND_RESET; 1726 } 1727 1728 int hci_power_control(HCI_POWER_MODE power_mode){ 1729 1730 log_info("hci_power_control: %u, current mode %u", power_mode, hci_stack->state); 1731 1732 int err = 0; 1733 switch (hci_stack->state){ 1734 1735 case HCI_STATE_OFF: 1736 switch (power_mode){ 1737 case HCI_POWER_ON: 1738 err = hci_power_control_on(); 1739 if (err) { 1740 log_error("hci_power_control_on() error %u", err); 1741 return err; 1742 } 1743 hci_power_transition_to_initializing(); 1744 break; 1745 case HCI_POWER_OFF: 1746 // do nothing 1747 break; 1748 case HCI_POWER_SLEEP: 1749 // do nothing (with SLEEP == OFF) 1750 break; 1751 } 1752 break; 1753 1754 case HCI_STATE_INITIALIZING: 1755 switch (power_mode){ 1756 case HCI_POWER_ON: 1757 // do nothing 1758 break; 1759 case HCI_POWER_OFF: 1760 // no connections yet, just turn it off 1761 hci_power_control_off(); 1762 break; 1763 case HCI_POWER_SLEEP: 1764 // no connections yet, just turn it off 1765 hci_power_control_sleep(); 1766 break; 1767 } 1768 break; 1769 1770 case HCI_STATE_WORKING: 1771 switch (power_mode){ 1772 case HCI_POWER_ON: 1773 // do nothing 1774 break; 1775 case HCI_POWER_OFF: 1776 // see hci_run 1777 hci_stack->state = HCI_STATE_HALTING; 1778 break; 1779 case HCI_POWER_SLEEP: 1780 // see hci_run 1781 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1782 hci_stack->substate = HCI_INIT_SEND_RESET; 1783 break; 1784 } 1785 break; 1786 1787 case HCI_STATE_HALTING: 1788 switch (power_mode){ 1789 case HCI_POWER_ON: 1790 hci_power_transition_to_initializing(); 1791 break; 1792 case HCI_POWER_OFF: 1793 // do nothing 1794 break; 1795 case HCI_POWER_SLEEP: 1796 // see hci_run 1797 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1798 hci_stack->substate = HCI_INIT_SEND_RESET; 1799 break; 1800 } 1801 break; 1802 1803 case HCI_STATE_FALLING_ASLEEP: 1804 switch (power_mode){ 1805 case HCI_POWER_ON: 1806 1807 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1808 // nothing to do, if H4 supports power management 1809 if (bt_control_iphone_power_management_enabled()){ 1810 hci_stack->state = HCI_STATE_INITIALIZING; 1811 hci_stack->substate = HCI_INIT_AFTER_SLEEP; 1812 break; 1813 } 1814 #endif 1815 hci_power_transition_to_initializing(); 1816 break; 1817 case HCI_POWER_OFF: 1818 // see hci_run 1819 hci_stack->state = HCI_STATE_HALTING; 1820 break; 1821 case HCI_POWER_SLEEP: 1822 // do nothing 1823 break; 1824 } 1825 break; 1826 1827 case HCI_STATE_SLEEPING: 1828 switch (power_mode){ 1829 case HCI_POWER_ON: 1830 1831 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1832 // nothing to do, if H4 supports power management 1833 if (bt_control_iphone_power_management_enabled()){ 1834 hci_stack->state = HCI_STATE_INITIALIZING; 1835 hci_stack->substate = HCI_INIT_AFTER_SLEEP; 1836 hci_update_scan_enable(); 1837 break; 1838 } 1839 #endif 1840 err = hci_power_control_wake(); 1841 if (err) return err; 1842 hci_power_transition_to_initializing(); 1843 break; 1844 case HCI_POWER_OFF: 1845 hci_stack->state = HCI_STATE_HALTING; 1846 break; 1847 case HCI_POWER_SLEEP: 1848 // do nothing 1849 break; 1850 } 1851 break; 1852 } 1853 1854 // create internal event 1855 hci_emit_state(); 1856 1857 // trigger next/first action 1858 hci_run(); 1859 1860 return 0; 1861 } 1862 1863 static void hci_update_scan_enable(void){ 1864 // 2 = page scan, 1 = inq scan 1865 hci_stack->new_scan_enable_value = hci_stack->connectable << 1 | hci_stack->discoverable; 1866 hci_run(); 1867 } 1868 1869 void hci_discoverable_control(uint8_t enable){ 1870 if (enable) enable = 1; // normalize argument 1871 1872 if (hci_stack->discoverable == enable){ 1873 hci_emit_discoverable_enabled(hci_stack->discoverable); 1874 return; 1875 } 1876 1877 hci_stack->discoverable = enable; 1878 hci_update_scan_enable(); 1879 } 1880 1881 void hci_connectable_control(uint8_t enable){ 1882 if (enable) enable = 1; // normalize argument 1883 1884 // don't emit event 1885 if (hci_stack->connectable == enable) return; 1886 1887 hci_stack->connectable = enable; 1888 hci_update_scan_enable(); 1889 } 1890 1891 void hci_local_bd_addr(bd_addr_t address_buffer){ 1892 memcpy(address_buffer, hci_stack->local_bd_addr, 6); 1893 } 1894 1895 void hci_run(){ 1896 1897 hci_connection_t * connection; 1898 linked_item_t * it; 1899 1900 // send continuation fragments first, as they block the prepared packet buffer 1901 if (hci_stack->acl_fragmentation_total_size > 0) { 1902 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(hci_stack->hci_packet_buffer); 1903 if (hci_can_send_prepared_acl_packet_now(con_handle)){ 1904 hci_connection_t *connection = hci_connection_for_handle(con_handle); 1905 if (connection) { 1906 hci_send_acl_packet_fragments(connection); 1907 return; 1908 } 1909 // connection gone -> discard further fragments 1910 hci_stack->acl_fragmentation_total_size = 0; 1911 hci_stack->acl_fragmentation_pos = 0; 1912 } 1913 } 1914 1915 if (!hci_can_send_command_packet_now()) return; 1916 1917 // global/non-connection oriented commands 1918 1919 // decline incoming connections 1920 if (hci_stack->decline_reason){ 1921 uint8_t reason = hci_stack->decline_reason; 1922 hci_stack->decline_reason = 0; 1923 hci_send_cmd(&hci_reject_connection_request, hci_stack->decline_addr, reason); 1924 return; 1925 } 1926 1927 // send scan enable 1928 if (hci_stack->state == HCI_STATE_WORKING && hci_stack->new_scan_enable_value != 0xff && hci_classic_supported()){ 1929 hci_send_cmd(&hci_write_scan_enable, hci_stack->new_scan_enable_value); 1930 hci_stack->new_scan_enable_value = 0xff; 1931 return; 1932 } 1933 1934 #ifdef HAVE_BLE 1935 // handle le scan 1936 if (hci_stack->state == HCI_STATE_WORKING){ 1937 switch(hci_stack->le_scanning_state){ 1938 case LE_START_SCAN: 1939 hci_stack->le_scanning_state = LE_SCANNING; 1940 hci_send_cmd(&hci_le_set_scan_enable, 1, 0); 1941 return; 1942 1943 case LE_STOP_SCAN: 1944 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1945 hci_send_cmd(&hci_le_set_scan_enable, 0, 0); 1946 return; 1947 default: 1948 break; 1949 } 1950 if (hci_stack->le_scan_type != 0xff){ 1951 // defaults: active scanning, accept all advertisement packets 1952 int scan_type = hci_stack->le_scan_type; 1953 hci_stack->le_scan_type = 0xff; 1954 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); 1955 return; 1956 } 1957 } 1958 #endif 1959 1960 // send pending HCI commands 1961 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 1962 connection = (hci_connection_t *) it; 1963 1964 switch(connection->state){ 1965 case SEND_CREATE_CONNECTION: 1966 switch(connection->address_type){ 1967 case BD_ADDR_TYPE_CLASSIC: 1968 log_info("sending hci_create_connection"); 1969 hci_send_cmd(&hci_create_connection, connection->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 1970 break; 1971 default: 1972 #ifdef HAVE_BLE 1973 log_info("sending hci_le_create_connection"); 1974 hci_send_cmd(&hci_le_create_connection, 1975 0x0060, // scan interval: 60 ms 1976 0x0030, // scan interval: 30 ms 1977 0, // don't use whitelist 1978 connection->address_type, // peer address type 1979 connection->address, // peer bd addr 1980 hci_stack->adv_addr_type, // our addr type: 1981 0x0008, // conn interval min 1982 0x0018, // conn interval max 1983 0, // conn latency 1984 0x0048, // supervision timeout 1985 0x0001, // min ce length 1986 0x0001 // max ce length 1987 ); 1988 1989 connection->state = SENT_CREATE_CONNECTION; 1990 #endif 1991 break; 1992 } 1993 return; 1994 1995 case RECEIVED_CONNECTION_REQUEST: 1996 log_info("sending hci_accept_connection_request"); 1997 connection->state = ACCEPTED_CONNECTION_REQUEST; 1998 if (connection->address_type == BD_ADDR_TYPE_CLASSIC){ 1999 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 2000 } else { 2001 // TODO: allows to customize synchronous connection parameters 2002 hci_send_cmd(&hci_accept_synchronous_connection_command, connection->address, 8000, 8000, 0xFFFF, 0x0060, 0xFF, 0x003F); 2003 } 2004 return; 2005 2006 #ifdef HAVE_BLE 2007 case SEND_CANCEL_CONNECTION: 2008 connection->state = SENT_CANCEL_CONNECTION; 2009 hci_send_cmd(&hci_le_create_connection_cancel); 2010 return; 2011 #endif 2012 case SEND_DISCONNECT: 2013 connection->state = SENT_DISCONNECT; 2014 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2015 return; 2016 2017 default: 2018 break; 2019 } 2020 2021 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 2022 log_info("responding to link key request"); 2023 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 2024 link_key_t link_key; 2025 link_key_type_t link_key_type; 2026 if ( hci_stack->remote_device_db 2027 && hci_stack->remote_device_db->get_link_key(connection->address, link_key, &link_key_type) 2028 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 2029 connection->link_key_type = link_key_type; 2030 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 2031 } else { 2032 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 2033 } 2034 return; 2035 } 2036 2037 if (connection->authentication_flags & DENY_PIN_CODE_REQUEST){ 2038 log_info("denying to pin request"); 2039 connectionClearAuthenticationFlags(connection, DENY_PIN_CODE_REQUEST); 2040 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 2041 return; 2042 } 2043 2044 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 2045 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 2046 log_info("IO Capability Request received, stack bondable %u, io cap %u", hci_stack->bondable, hci_stack->ssp_io_capability); 2047 if (hci_stack->bondable && (hci_stack->ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN)){ 2048 // tweak authentication requirements 2049 uint8_t authreq = hci_stack->ssp_authentication_requirement; 2050 if (connection->bonding_flags & BONDING_DEDICATED){ 2051 authreq = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING; 2052 } 2053 if (gap_mitm_protection_required_for_security_level(connection->requested_security_level)){ 2054 authreq |= 1; 2055 } 2056 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack->ssp_io_capability, NULL, authreq); 2057 } else { 2058 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 2059 } 2060 return; 2061 } 2062 2063 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 2064 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 2065 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 2066 return; 2067 } 2068 2069 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 2070 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 2071 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 2072 return; 2073 } 2074 2075 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 2076 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 2077 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 2078 return; 2079 } 2080 2081 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 2082 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 2083 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 2084 return; 2085 } 2086 if (connection->bonding_flags & BONDING_DISCONNECT_DEDICATED_DONE){ 2087 connection->bonding_flags &= ~BONDING_DISCONNECT_DEDICATED_DONE; 2088 connection->bonding_flags |= BONDING_EMIT_COMPLETE_ON_DISCONNECT; 2089 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // authentication done 2090 return; 2091 } 2092 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 2093 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 2094 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 2095 return; 2096 } 2097 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 2098 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 2099 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 2100 return; 2101 } 2102 2103 #ifdef HAVE_BLE 2104 if (connection->le_con_parameter_update_state == CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS){ 2105 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 2106 2107 uint16_t connection_interval_min = connection->le_conn_interval_min; 2108 connection->le_conn_interval_min = 0; 2109 hci_send_cmd(&hci_le_connection_update, connection->con_handle, connection_interval_min, 2110 connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout, 2111 0x0000, 0xffff); 2112 } 2113 #endif 2114 } 2115 2116 switch (hci_stack->state){ 2117 case HCI_STATE_INITIALIZING: 2118 hci_initializing_state_machine(); 2119 break; 2120 2121 case HCI_STATE_HALTING: 2122 2123 log_info("HCI_STATE_HALTING"); 2124 // close all open connections 2125 connection = (hci_connection_t *) hci_stack->connections; 2126 if (connection){ 2127 2128 // send disconnect 2129 if (!hci_can_send_command_packet_now()) return; 2130 2131 log_info("HCI_STATE_HALTING, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2132 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2133 2134 // send disconnected event right away - causes higher layer connections to get closed, too. 2135 hci_shutdown_connection(connection); 2136 return; 2137 } 2138 log_info("HCI_STATE_HALTING, calling off"); 2139 2140 // switch mode 2141 hci_power_control_off(); 2142 2143 log_info("HCI_STATE_HALTING, emitting state"); 2144 hci_emit_state(); 2145 log_info("HCI_STATE_HALTING, done"); 2146 break; 2147 2148 case HCI_STATE_FALLING_ASLEEP: 2149 switch(hci_stack->substate) { 2150 case 0: 2151 log_info("HCI_STATE_FALLING_ASLEEP"); 2152 // close all open connections 2153 connection = (hci_connection_t *) hci_stack->connections; 2154 2155 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2156 // don't close connections, if H4 supports power management 2157 if (bt_control_iphone_power_management_enabled()){ 2158 connection = NULL; 2159 } 2160 #endif 2161 if (connection){ 2162 2163 // send disconnect 2164 if (!hci_can_send_command_packet_now()) return; 2165 2166 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2167 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2168 2169 // send disconnected event right away - causes higher layer connections to get closed, too. 2170 hci_shutdown_connection(connection); 2171 return; 2172 } 2173 2174 if (hci_classic_supported()){ 2175 // disable page and inquiry scan 2176 if (!hci_can_send_command_packet_now()) return; 2177 2178 log_info("HCI_STATE_HALTING, disabling inq scans"); 2179 hci_send_cmd(&hci_write_scan_enable, hci_stack->connectable << 1); // drop inquiry scan but keep page scan 2180 2181 // continue in next sub state 2182 hci_initializing_next_state(); 2183 break; 2184 } 2185 // fall through for ble-only chips 2186 2187 case 2: 2188 log_info("HCI_STATE_HALTING, calling sleep"); 2189 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2190 // don't actually go to sleep, if H4 supports power management 2191 if (bt_control_iphone_power_management_enabled()){ 2192 // SLEEP MODE reached 2193 hci_stack->state = HCI_STATE_SLEEPING; 2194 hci_emit_state(); 2195 break; 2196 } 2197 #endif 2198 // switch mode 2199 hci_power_control_sleep(); // changes hci_stack->state to SLEEP 2200 hci_emit_state(); 2201 break; 2202 2203 default: 2204 break; 2205 } 2206 break; 2207 2208 default: 2209 break; 2210 } 2211 } 2212 2213 int hci_send_cmd_packet(uint8_t *packet, int size){ 2214 bd_addr_t addr; 2215 hci_connection_t * conn; 2216 // house-keeping 2217 2218 // create_connection? 2219 if (IS_COMMAND(packet, hci_create_connection)){ 2220 bt_flip_addr(addr, &packet[3]); 2221 log_info("Create_connection to %s", bd_addr_to_str(addr)); 2222 2223 conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2224 if (!conn){ 2225 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2226 if (!conn){ 2227 // notify client that alloc failed 2228 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 2229 return 0; // don't sent packet to controller 2230 } 2231 conn->state = SEND_CREATE_CONNECTION; 2232 } 2233 log_info("conn state %u", conn->state); 2234 switch (conn->state){ 2235 // if connection active exists 2236 case OPEN: 2237 // and OPEN, emit connection complete command, don't send to controller 2238 hci_emit_connection_complete(conn, 0); 2239 return 0; 2240 case SEND_CREATE_CONNECTION: 2241 // connection created by hci, e.g. dedicated bonding 2242 break; 2243 default: 2244 // otherwise, just ignore as it is already in the open process 2245 return 0; 2246 } 2247 conn->state = SENT_CREATE_CONNECTION; 2248 } 2249 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 2250 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 2251 } 2252 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 2253 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 2254 } 2255 2256 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 2257 if (hci_stack->remote_device_db){ 2258 bt_flip_addr(addr, &packet[3]); 2259 hci_stack->remote_device_db->delete_link_key(addr); 2260 } 2261 } 2262 2263 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply) 2264 || IS_COMMAND(packet, hci_pin_code_request_reply)){ 2265 bt_flip_addr(addr, &packet[3]); 2266 conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2267 if (conn){ 2268 connectionClearAuthenticationFlags(conn, LEGACY_PAIRING_ACTIVE); 2269 } 2270 } 2271 2272 if (IS_COMMAND(packet, hci_user_confirmation_request_negative_reply) 2273 || IS_COMMAND(packet, hci_user_confirmation_request_reply) 2274 || IS_COMMAND(packet, hci_user_passkey_request_negative_reply) 2275 || IS_COMMAND(packet, hci_user_passkey_request_reply)) { 2276 bt_flip_addr(addr, &packet[3]); 2277 conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2278 if (conn){ 2279 connectionClearAuthenticationFlags(conn, SSP_PAIRING_ACTIVE); 2280 } 2281 } 2282 2283 #ifdef HAVE_BLE 2284 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 2285 hci_stack->adv_addr_type = packet[8]; 2286 } 2287 if (IS_COMMAND(packet, hci_le_set_random_address)){ 2288 bt_flip_addr(hci_stack->adv_address, &packet[3]); 2289 } 2290 #endif 2291 2292 hci_stack->num_cmd_packets--; 2293 2294 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, packet, size); 2295 int err = hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 2296 2297 // release packet buffer for synchronous transport implementations 2298 if (hci_transport_synchronous() && (packet == hci_stack->hci_packet_buffer)){ 2299 hci_stack->hci_packet_buffer_reserved = 0; 2300 } 2301 2302 return err; 2303 } 2304 2305 // disconnect because of security block 2306 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 2307 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2308 if (!connection) return; 2309 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 2310 } 2311 2312 2313 // Configure Secure Simple Pairing 2314 2315 // enable will enable SSP during init 2316 void hci_ssp_set_enable(int enable){ 2317 hci_stack->ssp_enable = enable; 2318 } 2319 2320 int hci_local_ssp_activated(){ 2321 return hci_ssp_supported() && hci_stack->ssp_enable; 2322 } 2323 2324 // if set, BTstack will respond to io capability request using authentication requirement 2325 void hci_ssp_set_io_capability(int io_capability){ 2326 hci_stack->ssp_io_capability = io_capability; 2327 } 2328 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 2329 hci_stack->ssp_authentication_requirement = authentication_requirement; 2330 } 2331 2332 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 2333 void hci_ssp_set_auto_accept(int auto_accept){ 2334 hci_stack->ssp_auto_accept = auto_accept; 2335 } 2336 2337 /** 2338 * pre: numcmds >= 0 - it's allowed to send a command to the controller 2339 */ 2340 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 2341 2342 if (!hci_can_send_command_packet_now()){ 2343 log_error("hci_send_cmd called but cannot send packet now"); 2344 return 0; 2345 } 2346 2347 // for HCI INITIALIZATION 2348 // log_info("hci_send_cmd: opcode %04x", cmd->opcode); 2349 hci_stack->last_cmd_opcode = cmd->opcode; 2350 2351 hci_reserve_packet_buffer(); 2352 uint8_t * packet = hci_stack->hci_packet_buffer; 2353 2354 va_list argptr; 2355 va_start(argptr, cmd); 2356 uint16_t size = hci_create_cmd_internal(packet, cmd, argptr); 2357 va_end(argptr); 2358 2359 return hci_send_cmd_packet(packet, size); 2360 } 2361 2362 // Create various non-HCI events. 2363 // TODO: generalize, use table similar to hci_create_command 2364 2365 void hci_emit_state(){ 2366 log_info("BTSTACK_EVENT_STATE %u", hci_stack->state); 2367 uint8_t event[3]; 2368 event[0] = BTSTACK_EVENT_STATE; 2369 event[1] = sizeof(event) - 2; 2370 event[2] = hci_stack->state; 2371 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2372 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2373 } 2374 2375 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 2376 uint8_t event[13]; 2377 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 2378 event[1] = sizeof(event) - 2; 2379 event[2] = status; 2380 bt_store_16(event, 3, conn->con_handle); 2381 bt_flip_addr(&event[5], conn->address); 2382 event[11] = 1; // ACL connection 2383 event[12] = 0; // encryption disabled 2384 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2385 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2386 } 2387 2388 void hci_emit_le_connection_complete(uint8_t address_type, bd_addr_t address, uint16_t conn_handle, uint8_t status){ 2389 uint8_t event[21]; 2390 event[0] = HCI_EVENT_LE_META; 2391 event[1] = sizeof(event) - 2; 2392 event[2] = HCI_SUBEVENT_LE_CONNECTION_COMPLETE; 2393 event[3] = status; 2394 bt_store_16(event, 4, conn_handle); 2395 event[6] = 0; // TODO: role 2396 event[7] = address_type; 2397 bt_flip_addr(&event[8], address); 2398 bt_store_16(event, 14, 0); // interval 2399 bt_store_16(event, 16, 0); // latency 2400 bt_store_16(event, 18, 0); // supervision timeout 2401 event[20] = 0; // master clock accuracy 2402 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2403 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2404 } 2405 2406 void hci_emit_disconnection_complete(uint16_t handle, uint8_t reason){ 2407 uint8_t event[6]; 2408 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 2409 event[1] = sizeof(event) - 2; 2410 event[2] = 0; // status = OK 2411 bt_store_16(event, 3, handle); 2412 event[5] = reason; 2413 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2414 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2415 } 2416 2417 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 2418 if (disable_l2cap_timeouts) return; 2419 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 2420 uint8_t event[4]; 2421 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 2422 event[1] = sizeof(event) - 2; 2423 bt_store_16(event, 2, conn->con_handle); 2424 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2425 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2426 } 2427 2428 void hci_emit_nr_connections_changed(){ 2429 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 2430 uint8_t event[3]; 2431 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 2432 event[1] = sizeof(event) - 2; 2433 event[2] = nr_hci_connections(); 2434 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2435 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2436 } 2437 2438 void hci_emit_hci_open_failed(){ 2439 log_info("BTSTACK_EVENT_POWERON_FAILED"); 2440 uint8_t event[2]; 2441 event[0] = BTSTACK_EVENT_POWERON_FAILED; 2442 event[1] = sizeof(event) - 2; 2443 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2444 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2445 } 2446 2447 #ifndef EMBEDDED 2448 void hci_emit_btstack_version() { 2449 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 2450 uint8_t event[6]; 2451 event[0] = BTSTACK_EVENT_VERSION; 2452 event[1] = sizeof(event) - 2; 2453 event[2] = BTSTACK_MAJOR; 2454 event[3] = BTSTACK_MINOR; 2455 bt_store_16(event, 4, BTSTACK_REVISION); 2456 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2457 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2458 } 2459 #endif 2460 2461 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 2462 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 2463 uint8_t event[3]; 2464 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 2465 event[1] = sizeof(event) - 2; 2466 event[2] = enabled; 2467 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2468 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2469 } 2470 2471 void hci_emit_remote_name_cached(bd_addr_t addr, device_name_t *name){ 2472 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 2473 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 2474 event[1] = sizeof(event) - 2 - 1; 2475 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 2476 bt_flip_addr(&event[3], addr); 2477 memcpy(&event[9], name, 248); 2478 2479 event[9+248] = 0; // assert \0 for log_info 2480 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(addr), &event[9]); 2481 2482 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 2483 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 2484 } 2485 2486 void hci_emit_discoverable_enabled(uint8_t enabled){ 2487 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 2488 uint8_t event[3]; 2489 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 2490 event[1] = sizeof(event) - 2; 2491 event[2] = enabled; 2492 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2493 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2494 } 2495 2496 void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){ 2497 log_info("hci_emit_security_level %u for handle %x", level, con_handle); 2498 uint8_t event[5]; 2499 int pos = 0; 2500 event[pos++] = GAP_SECURITY_LEVEL; 2501 event[pos++] = sizeof(event) - 2; 2502 bt_store_16(event, 2, con_handle); 2503 pos += 2; 2504 event[pos++] = level; 2505 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2506 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2507 } 2508 2509 void hci_emit_dedicated_bonding_result(bd_addr_t address, uint8_t status){ 2510 log_info("hci_emit_dedicated_bonding_result %u ", status); 2511 uint8_t event[9]; 2512 int pos = 0; 2513 event[pos++] = GAP_DEDICATED_BONDING_COMPLETED; 2514 event[pos++] = sizeof(event) - 2; 2515 event[pos++] = status; 2516 bt_flip_addr( &event[pos], address); 2517 pos += 6; 2518 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2519 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2520 } 2521 2522 // query if remote side supports SSP 2523 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 2524 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2525 if (!connection) return 0; 2526 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 2527 } 2528 2529 int hci_ssp_supported_on_both_sides(hci_con_handle_t handle){ 2530 return hci_local_ssp_activated() && hci_remote_ssp_supported(handle); 2531 } 2532 2533 // GAP API 2534 /** 2535 * @bbrief enable/disable bonding. default is enabled 2536 * @praram enabled 2537 */ 2538 void gap_set_bondable_mode(int enable){ 2539 hci_stack->bondable = enable ? 1 : 0; 2540 } 2541 2542 /** 2543 * @brief map link keys to security levels 2544 */ 2545 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 2546 switch (link_key_type){ 2547 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 2548 return LEVEL_4; 2549 case COMBINATION_KEY: 2550 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 2551 return LEVEL_3; 2552 default: 2553 return LEVEL_2; 2554 } 2555 } 2556 2557 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 2558 if (!connection) return LEVEL_0; 2559 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 2560 return gap_security_level_for_link_key_type(connection->link_key_type); 2561 } 2562 2563 2564 int gap_mitm_protection_required_for_security_level(gap_security_level_t level){ 2565 log_info("gap_mitm_protection_required_for_security_level %u", level); 2566 return level > LEVEL_2; 2567 } 2568 2569 /** 2570 * @brief get current security level 2571 */ 2572 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 2573 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2574 if (!connection) return LEVEL_0; 2575 return gap_security_level_for_connection(connection); 2576 } 2577 2578 /** 2579 * @brief request connection to device to 2580 * @result GAP_AUTHENTICATION_RESULT 2581 */ 2582 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 2583 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2584 if (!connection){ 2585 hci_emit_security_level(con_handle, LEVEL_0); 2586 return; 2587 } 2588 gap_security_level_t current_level = gap_security_level(con_handle); 2589 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 2590 if (current_level >= requested_level){ 2591 hci_emit_security_level(con_handle, current_level); 2592 return; 2593 } 2594 2595 connection->requested_security_level = requested_level; 2596 2597 #if 0 2598 // sending encryption request without a link key results in an error. 2599 // TODO: figure out how to use it properly 2600 2601 // would enabling ecnryption suffice (>= LEVEL_2)? 2602 if (hci_stack->remote_device_db){ 2603 link_key_type_t link_key_type; 2604 link_key_t link_key; 2605 if (hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type)){ 2606 if (gap_security_level_for_link_key_type(link_key_type) >= requested_level){ 2607 connection->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 2608 return; 2609 } 2610 } 2611 } 2612 #endif 2613 2614 // try to authenticate connection 2615 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 2616 hci_run(); 2617 } 2618 2619 /** 2620 * @brief start dedicated bonding with device. disconnect after bonding 2621 * @param device 2622 * @param request MITM protection 2623 * @result GAP_DEDICATED_BONDING_COMPLETE 2624 */ 2625 int gap_dedicated_bonding(bd_addr_t device, int mitm_protection_required){ 2626 2627 // create connection state machine 2628 hci_connection_t * connection = create_connection_for_bd_addr_and_type(device, BD_ADDR_TYPE_CLASSIC); 2629 2630 if (!connection){ 2631 return BTSTACK_MEMORY_ALLOC_FAILED; 2632 } 2633 2634 // delete linkn key 2635 hci_drop_link_key_for_bd_addr(device); 2636 2637 // configure LEVEL_2/3, dedicated bonding 2638 connection->state = SEND_CREATE_CONNECTION; 2639 connection->requested_security_level = mitm_protection_required ? LEVEL_3 : LEVEL_2; 2640 log_info("gap_dedicated_bonding, mitm %u -> level %u", mitm_protection_required, connection->requested_security_level); 2641 connection->bonding_flags = BONDING_DEDICATED; 2642 2643 // wait for GAP Security Result and send GAP Dedicated Bonding complete 2644 2645 // handle: connnection failure (connection complete != ok) 2646 // handle: authentication failure 2647 // handle: disconnect on done 2648 2649 hci_run(); 2650 2651 return 0; 2652 } 2653 2654 void gap_set_local_name(const char * local_name){ 2655 hci_stack->local_name = local_name; 2656 } 2657 2658 le_command_status_t le_central_start_scan(){ 2659 if (hci_stack->le_scanning_state == LE_SCANNING) return BLE_PERIPHERAL_OK; 2660 hci_stack->le_scanning_state = LE_START_SCAN; 2661 hci_run(); 2662 return BLE_PERIPHERAL_OK; 2663 } 2664 2665 le_command_status_t le_central_stop_scan(){ 2666 if ( hci_stack->le_scanning_state == LE_SCAN_IDLE) return BLE_PERIPHERAL_OK; 2667 hci_stack->le_scanning_state = LE_STOP_SCAN; 2668 hci_run(); 2669 return BLE_PERIPHERAL_OK; 2670 } 2671 2672 void le_central_set_scan_parameters(uint8_t scan_type, uint16_t scan_interval, uint16_t scan_window){ 2673 hci_stack->le_scan_type = scan_type; 2674 hci_stack->le_scan_interval = scan_interval; 2675 hci_stack->le_scan_window = scan_window; 2676 hci_run(); 2677 } 2678 2679 le_command_status_t le_central_connect(bd_addr_t addr, bd_addr_type_t addr_type){ 2680 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 2681 if (!conn){ 2682 log_info("le_central_connect: no connection exists yet, creating context"); 2683 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 2684 if (!conn){ 2685 // notify client that alloc failed 2686 hci_emit_le_connection_complete(addr_type, addr, 0, BTSTACK_MEMORY_ALLOC_FAILED); 2687 log_info("le_central_connect: failed to alloc hci_connection_t"); 2688 return BLE_PERIPHERAL_NOT_CONNECTED; // don't sent packet to controller 2689 } 2690 conn->state = SEND_CREATE_CONNECTION; 2691 log_info("le_central_connect: send create connection next"); 2692 hci_run(); 2693 return BLE_PERIPHERAL_OK; 2694 } 2695 2696 if (!hci_is_le_connection(conn) || 2697 conn->state == SEND_CREATE_CONNECTION || 2698 conn->state == SENT_CREATE_CONNECTION) { 2699 hci_emit_le_connection_complete(conn->address_type, conn->address, 0, ERROR_CODE_COMMAND_DISALLOWED); 2700 log_error("le_central_connect: classic connection or connect is already being created"); 2701 return BLE_PERIPHERAL_IN_WRONG_STATE; 2702 } 2703 2704 log_info("le_central_connect: context exists with state %u", conn->state); 2705 hci_emit_le_connection_complete(conn->address_type, conn->address, conn->con_handle, 0); 2706 hci_run(); 2707 return BLE_PERIPHERAL_OK; 2708 } 2709 2710 // @assumption: only a single outgoing LE Connection exists 2711 static hci_connection_t * le_central_get_outgoing_connection(){ 2712 linked_item_t *it; 2713 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 2714 hci_connection_t * conn = (hci_connection_t *) it; 2715 if (!hci_is_le_connection(conn)) continue; 2716 switch (conn->state){ 2717 case SEND_CREATE_CONNECTION: 2718 case SENT_CREATE_CONNECTION: 2719 return conn; 2720 default: 2721 break; 2722 }; 2723 } 2724 return NULL; 2725 } 2726 2727 le_command_status_t le_central_connect_cancel(){ 2728 hci_connection_t * conn = le_central_get_outgoing_connection(); 2729 switch (conn->state){ 2730 case SEND_CREATE_CONNECTION: 2731 // skip sending create connection and emit event instead 2732 hci_emit_le_connection_complete(conn->address_type, conn->address, 0, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 2733 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 2734 btstack_memory_hci_connection_free( conn ); 2735 break; 2736 case SENT_CREATE_CONNECTION: 2737 // request to send cancel connection 2738 conn->state = SEND_CANCEL_CONNECTION; 2739 hci_run(); 2740 break; 2741 default: 2742 break; 2743 } 2744 return BLE_PERIPHERAL_OK; 2745 } 2746 2747 /** 2748 * @brief Updates the connection parameters for a given LE connection 2749 * @param handle 2750 * @param conn_interval_min (unit: 1.25ms) 2751 * @param conn_interval_max (unit: 1.25ms) 2752 * @param conn_latency 2753 * @param supervision_timeout (unit: 10ms) 2754 * @returns 0 if ok 2755 */ 2756 int gap_update_connection_parameters(hci_con_handle_t con_handle, uint16_t conn_interval_min, 2757 uint16_t conn_interval_max, uint16_t conn_latency, uint16_t supervision_timeout){ 2758 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2759 if (!connection) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2760 connection->le_conn_interval_min = conn_interval_min; 2761 connection->le_conn_interval_max = conn_interval_max; 2762 connection->le_conn_latency = conn_latency; 2763 connection->le_supervision_timeout = supervision_timeout; 2764 return 0; 2765 } 2766 2767 le_command_status_t gap_disconnect(hci_con_handle_t handle){ 2768 hci_connection_t * conn = hci_connection_for_handle(handle); 2769 if (!conn){ 2770 hci_emit_disconnection_complete(handle, 0); 2771 return BLE_PERIPHERAL_OK; 2772 } 2773 conn->state = SEND_DISCONNECT; 2774 hci_run(); 2775 return BLE_PERIPHERAL_OK; 2776 } 2777 2778 void hci_disconnect_all(){ 2779 linked_list_iterator_t it; 2780 linked_list_iterator_init(&it, &hci_stack->connections); 2781 while (linked_list_iterator_has_next(&it)){ 2782 hci_connection_t * con = (hci_connection_t*) linked_list_iterator_next(&it); 2783 if (con->state == SENT_DISCONNECT) continue; 2784 con->state = SEND_DISCONNECT; 2785 } 2786 hci_run(); 2787 } 2788