1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 /* 39 * hci.c 40 * 41 * Created by Matthias Ringwald on 4/29/09. 42 * 43 */ 44 45 #include "btstack-config.h" 46 47 #include "hci.h" 48 #include "gap.h" 49 50 #include <stdarg.h> 51 #include <string.h> 52 #include <stdio.h> 53 54 #ifndef EMBEDDED 55 #ifdef _WIN32 56 #include "Winsock2.h" 57 #else 58 #include <unistd.h> // gethostbyname 59 #endif 60 #include <btstack/version.h> 61 #endif 62 63 #include "btstack_memory.h" 64 #include "debug.h" 65 #include "hci_dump.h" 66 67 #include <btstack/linked_list.h> 68 #include <btstack/hci_cmds.h> 69 70 #define HCI_CONNECTION_TIMEOUT_MS 10000 71 72 #define HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP 11 73 74 #ifdef USE_BLUETOOL 75 #include "../platforms/ios/src/bt_control_iphone.h" 76 #endif 77 78 static void hci_update_scan_enable(void); 79 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection); 80 static void hci_connection_timeout_handler(timer_source_t *timer); 81 static void hci_connection_timestamp(hci_connection_t *connection); 82 static int hci_power_control_on(void); 83 static void hci_power_control_off(void); 84 static void hci_state_reset(); 85 86 // the STACK is here 87 #ifndef HAVE_MALLOC 88 static hci_stack_t hci_stack_static; 89 #endif 90 static hci_stack_t * hci_stack = NULL; 91 92 // test helper 93 static uint8_t disable_l2cap_timeouts = 0; 94 95 /** 96 * create connection for given address 97 * 98 * @return connection OR NULL, if no memory left 99 */ 100 static hci_connection_t * create_connection_for_bd_addr_and_type(bd_addr_t addr, bd_addr_type_t addr_type){ 101 log_info("create_connection_for_addr %s", bd_addr_to_str(addr)); 102 hci_connection_t * conn = btstack_memory_hci_connection_get(); 103 if (!conn) return NULL; 104 memset(conn, 0, sizeof(hci_connection_t)); 105 BD_ADDR_COPY(conn->address, addr); 106 conn->address_type = addr_type; 107 conn->con_handle = 0xffff; 108 conn->authentication_flags = AUTH_FLAGS_NONE; 109 conn->bonding_flags = 0; 110 conn->requested_security_level = LEVEL_0; 111 linked_item_set_user(&conn->timeout.item, conn); 112 conn->timeout.process = hci_connection_timeout_handler; 113 hci_connection_timestamp(conn); 114 conn->acl_recombination_length = 0; 115 conn->acl_recombination_pos = 0; 116 conn->num_acl_packets_sent = 0; 117 conn->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 118 linked_list_add(&hci_stack->connections, (linked_item_t *) conn); 119 return conn; 120 } 121 122 123 /** 124 * get le connection parameter range 125 * 126 * @return le connection parameter range struct 127 */ 128 le_connection_parameter_range_t gap_le_get_connection_parameter_range(){ 129 return hci_stack->le_connection_parameter_range; 130 } 131 132 /** 133 * set le connection parameter range 134 * 135 */ 136 137 void gap_le_set_connection_parameter_range(le_connection_parameter_range_t range){ 138 hci_stack->le_connection_parameter_range.le_conn_interval_min = range.le_conn_interval_min; 139 hci_stack->le_connection_parameter_range.le_conn_interval_max = range.le_conn_interval_max; 140 hci_stack->le_connection_parameter_range.le_conn_interval_min = range.le_conn_latency_min; 141 hci_stack->le_connection_parameter_range.le_conn_interval_max = range.le_conn_latency_max; 142 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = range.le_supervision_timeout_min; 143 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = range.le_supervision_timeout_max; 144 } 145 146 /** 147 * get hci connections iterator 148 * 149 * @return hci connections iterator 150 */ 151 152 void hci_connections_get_iterator(linked_list_iterator_t *it){ 153 linked_list_iterator_init(it, &hci_stack->connections); 154 } 155 156 /** 157 * get connection for a given handle 158 * 159 * @return connection OR NULL, if not found 160 */ 161 hci_connection_t * hci_connection_for_handle(hci_con_handle_t con_handle){ 162 linked_list_iterator_t it; 163 linked_list_iterator_init(&it, &hci_stack->connections); 164 while (linked_list_iterator_has_next(&it)){ 165 hci_connection_t * item = (hci_connection_t *) linked_list_iterator_next(&it); 166 if ( item->con_handle == con_handle ) { 167 return item; 168 } 169 } 170 return NULL; 171 } 172 173 /** 174 * get connection for given address 175 * 176 * @return connection OR NULL, if not found 177 */ 178 hci_connection_t * hci_connection_for_bd_addr_and_type(bd_addr_t * addr, bd_addr_type_t addr_type){ 179 linked_list_iterator_t it; 180 linked_list_iterator_init(&it, &hci_stack->connections); 181 while (linked_list_iterator_has_next(&it)){ 182 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 183 if (connection->address_type != addr_type) continue; 184 if (memcmp(addr, connection->address, 6) != 0) continue; 185 return connection; 186 } 187 return NULL; 188 } 189 190 static void hci_connection_timeout_handler(timer_source_t *timer){ 191 hci_connection_t * connection = (hci_connection_t *) linked_item_get_user(&timer->item); 192 #ifdef HAVE_TIME 193 struct timeval tv; 194 gettimeofday(&tv, NULL); 195 if (tv.tv_sec >= connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000) { 196 // connections might be timed out 197 hci_emit_l2cap_check_timeout(connection); 198 } 199 #endif 200 #ifdef HAVE_TICK 201 if (embedded_get_ticks() > connection->timestamp + embedded_ticks_for_ms(HCI_CONNECTION_TIMEOUT_MS)){ 202 // connections might be timed out 203 hci_emit_l2cap_check_timeout(connection); 204 } 205 #endif 206 run_loop_set_timer(timer, HCI_CONNECTION_TIMEOUT_MS); 207 run_loop_add_timer(timer); 208 } 209 210 static void hci_connection_timestamp(hci_connection_t *connection){ 211 #ifdef HAVE_TIME 212 gettimeofday(&connection->timestamp, NULL); 213 #endif 214 #ifdef HAVE_TICK 215 connection->timestamp = embedded_get_ticks(); 216 #endif 217 } 218 219 220 inline static void connectionSetAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 221 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags | flags); 222 } 223 224 inline static void connectionClearAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 225 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags & ~flags); 226 } 227 228 229 /** 230 * add authentication flags and reset timer 231 * @note: assumes classic connection 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_t *) 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 = basic_num_sco_packets_sent; 351 // if (num_sco_packets_sent > hci_stack->sco_packets_total_num){ 352 // log_info("hci_number_free_sco_slots_for_handle: outgoing packets (%u) > total packets ()", num_sco_packets_sent, hci_stack->sco_packets_total_num); 353 // return 0; 354 // } 355 // return hci_stack->sco_packets_total_num - num_sco_packets_sent; 356 return 0; 357 } 358 359 // new functions replacing hci_can_send_packet_now[_using_packet_buffer] 360 int hci_can_send_command_packet_now(void){ 361 if (hci_stack->hci_packet_buffer_reserved) return 0; 362 363 // check for async hci transport implementations 364 if (hci_stack->hci_transport->can_send_packet_now){ 365 if (!hci_stack->hci_transport->can_send_packet_now(HCI_COMMAND_DATA_PACKET)){ 366 return 0; 367 } 368 } 369 370 return hci_stack->num_cmd_packets > 0; 371 } 372 373 int hci_can_send_prepared_acl_packet_now(hci_con_handle_t con_handle) { 374 // check for async hci transport implementations 375 if (hci_stack->hci_transport->can_send_packet_now){ 376 if (!hci_stack->hci_transport->can_send_packet_now(HCI_ACL_DATA_PACKET)){ 377 return 0; 378 } 379 } 380 return hci_number_free_acl_slots_for_handle(con_handle) > 0; 381 } 382 383 int hci_can_send_acl_packet_now(hci_con_handle_t con_handle){ 384 if (hci_stack->hci_packet_buffer_reserved) return 0; 385 return hci_can_send_prepared_acl_packet_now(con_handle); 386 } 387 388 int hci_can_send_prepared_sco_packet_now(hci_con_handle_t con_handle){ 389 if (hci_stack->hci_transport->can_send_packet_now){ 390 if (!hci_stack->hci_transport->can_send_packet_now(HCI_SCO_DATA_PACKET)){ 391 return 0; 392 } 393 } 394 return hci_number_free_sco_slots_for_handle(con_handle) > 0; 395 } 396 397 int hci_can_send_sco_packet_now(hci_con_handle_t con_handle){ 398 if (hci_stack->hci_packet_buffer_reserved) return 0; 399 return hci_can_send_prepared_sco_packet_now(con_handle); 400 } 401 402 // used for internal checks in l2cap[-le].c 403 int hci_is_packet_buffer_reserved(void){ 404 return hci_stack->hci_packet_buffer_reserved; 405 } 406 407 // reserves outgoing packet buffer. @returns 1 if successful 408 int hci_reserve_packet_buffer(void){ 409 if (hci_stack->hci_packet_buffer_reserved) { 410 log_error("hci_reserve_packet_buffer called but buffer already reserved"); 411 return 0; 412 } 413 hci_stack->hci_packet_buffer_reserved = 1; 414 return 1; 415 } 416 417 void hci_release_packet_buffer(void){ 418 hci_stack->hci_packet_buffer_reserved = 0; 419 } 420 421 // assumption: synchronous implementations don't provide can_send_packet_now as they don't keep the buffer after the call 422 int hci_transport_synchronous(void){ 423 return hci_stack->hci_transport->can_send_packet_now == NULL; 424 } 425 426 uint16_t hci_max_acl_le_data_packet_length(void){ 427 return hci_stack->le_data_packets_length > 0 ? hci_stack->le_data_packets_length : hci_stack->acl_data_packet_length; 428 } 429 430 static int hci_send_acl_packet_fragments(hci_connection_t *connection){ 431 432 // 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); 433 434 // max ACL data packet length depends on connection type (LE vs. Classic) and available buffers 435 uint16_t max_acl_data_packet_length = hci_stack->acl_data_packet_length; 436 if (hci_is_le_connection(connection) && hci_stack->le_data_packets_length > 0){ 437 max_acl_data_packet_length = hci_stack->le_data_packets_length; 438 } 439 440 // testing: reduce buffer to minimum 441 // max_acl_data_packet_length = 52; 442 443 int err; 444 // multiple packets could be send on a synchronous HCI transport 445 while (1){ 446 447 // get current data 448 const uint16_t acl_header_pos = hci_stack->acl_fragmentation_pos - 4; 449 int current_acl_data_packet_length = hci_stack->acl_fragmentation_total_size - hci_stack->acl_fragmentation_pos; 450 int more_fragments = 0; 451 452 // if ACL packet is larger than Bluetooth packet buffer, only send max_acl_data_packet_length 453 if (current_acl_data_packet_length > max_acl_data_packet_length){ 454 more_fragments = 1; 455 current_acl_data_packet_length = max_acl_data_packet_length; 456 } 457 458 // copy handle_and_flags if not first fragment and update packet boundary flags to be 01 (continuing fragmnent) 459 if (acl_header_pos > 0){ 460 uint16_t handle_and_flags = READ_BT_16(hci_stack->hci_packet_buffer, 0); 461 handle_and_flags = (handle_and_flags & 0xcfff) | (1 << 12); 462 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos, handle_and_flags); 463 } 464 465 // update header len 466 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos + 2, current_acl_data_packet_length); 467 468 // count packet 469 connection->num_acl_packets_sent++; 470 471 // send packet 472 uint8_t * packet = &hci_stack->hci_packet_buffer[acl_header_pos]; 473 const int size = current_acl_data_packet_length + 4; 474 hci_dump_packet(HCI_ACL_DATA_PACKET, 0, packet, size); 475 err = hci_stack->hci_transport->send_packet(HCI_ACL_DATA_PACKET, packet, size); 476 477 // done yet? 478 if (!more_fragments) break; 479 480 // update start of next fragment to send 481 hci_stack->acl_fragmentation_pos += current_acl_data_packet_length; 482 483 // can send more? 484 if (!hci_can_send_prepared_acl_packet_now(connection->con_handle)) return err; 485 } 486 487 // done 488 hci_stack->acl_fragmentation_pos = 0; 489 hci_stack->acl_fragmentation_total_size = 0; 490 491 // release buffer now for synchronous transport 492 if (hci_transport_synchronous()){ 493 hci_release_packet_buffer(); 494 } 495 496 return err; 497 } 498 499 // pre: caller has reserved the packet buffer 500 int hci_send_acl_packet_buffer(int size){ 501 502 // log_info("hci_send_acl_packet_buffer size %u", size); 503 504 if (!hci_stack->hci_packet_buffer_reserved) { 505 log_error("hci_send_acl_packet_buffer called without reserving packet buffer"); 506 return 0; 507 } 508 509 uint8_t * packet = hci_stack->hci_packet_buffer; 510 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 511 512 // check for free places on Bluetooth module 513 if (!hci_can_send_prepared_acl_packet_now(con_handle)) { 514 log_error("hci_send_acl_packet_buffer called but no free ACL buffers on controller"); 515 hci_release_packet_buffer(); 516 return BTSTACK_ACL_BUFFERS_FULL; 517 } 518 519 hci_connection_t *connection = hci_connection_for_handle( con_handle); 520 if (!connection) { 521 log_error("hci_send_acl_packet_buffer called but no connection for handle 0x%04x", con_handle); 522 hci_release_packet_buffer(); 523 return 0; 524 } 525 hci_connection_timestamp(connection); 526 527 // hci_dump_packet( HCI_ACL_DATA_PACKET, 0, packet, size); 528 529 // setup data 530 hci_stack->acl_fragmentation_total_size = size; 531 hci_stack->acl_fragmentation_pos = 4; // start of L2CAP packet 532 533 return hci_send_acl_packet_fragments(connection); 534 } 535 536 // pre: caller has reserved the packet buffer 537 int hci_send_sco_packet_buffer(int size){ 538 539 // log_info("hci_send_acl_packet_buffer size %u", size); 540 541 if (!hci_stack->hci_packet_buffer_reserved) { 542 log_error("hci_send_acl_packet_buffer called without reserving packet buffer"); 543 return 0; 544 } 545 546 uint8_t * packet = hci_stack->hci_packet_buffer; 547 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); // same for ACL and SCO 548 549 // check for free places on Bluetooth module 550 if (!hci_can_send_prepared_sco_packet_now(con_handle)) { 551 log_error("hci_send_sco_packet_buffer called but no free ACL buffers on controller"); 552 hci_release_packet_buffer(); 553 return BTSTACK_ACL_BUFFERS_FULL; 554 } 555 556 // TODO: track send packet in connection struct 557 // hci_connection_t *connection = hci_connection_for_handle( con_handle); 558 // if (!connection) { 559 // log_error("hci_send_acl_packet_buffer called but no connection for handle 0x%04x", con_handle); 560 // hci_release_packet_buffer(); 561 // return 0; 562 // } 563 // hci_connection_timestamp(connection); 564 565 hci_dump_packet( HCI_SCO_DATA_PACKET, 0, packet, size); 566 return hci_stack->hci_transport->send_packet(HCI_SCO_DATA_PACKET, packet, size); 567 } 568 569 static void acl_handler(uint8_t *packet, int size){ 570 571 // log_info("acl_handler: size %u", size); 572 573 // get info 574 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 575 hci_connection_t *conn = hci_connection_for_handle(con_handle); 576 uint8_t acl_flags = READ_ACL_FLAGS(packet); 577 uint16_t acl_length = READ_ACL_LENGTH(packet); 578 579 // ignore non-registered handle 580 if (!conn){ 581 log_error( "hci.c: acl_handler called with non-registered handle %u!" , con_handle); 582 return; 583 } 584 585 // assert packet is complete 586 if (acl_length + 4 != size){ 587 log_error("hci.c: acl_handler called with ACL packet of wrong size %u, expected %u => dropping packet", size, acl_length + 4); 588 return; 589 } 590 591 // update idle timestamp 592 hci_connection_timestamp(conn); 593 594 // handle different packet types 595 switch (acl_flags & 0x03) { 596 597 case 0x01: // continuation fragment 598 599 // sanity checks 600 if (conn->acl_recombination_pos == 0) { 601 log_error( "ACL Cont Fragment but no first fragment for handle 0x%02x", con_handle); 602 return; 603 } 604 if (conn->acl_recombination_pos + acl_length > 4 + HCI_ACL_BUFFER_SIZE){ 605 log_error( "ACL Cont Fragment to large: combined packet %u > buffer size %u for handle 0x%02x", 606 conn->acl_recombination_pos + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle); 607 conn->acl_recombination_pos = 0; 608 return; 609 } 610 611 // append fragment payload (header already stored) 612 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE + conn->acl_recombination_pos], &packet[4], acl_length ); 613 conn->acl_recombination_pos += acl_length; 614 615 // log_error( "ACL Cont Fragment: acl_len %u, combined_len %u, l2cap_len %u", acl_length, 616 // conn->acl_recombination_pos, conn->acl_recombination_length); 617 618 // forward complete L2CAP packet if complete. 619 if (conn->acl_recombination_pos >= conn->acl_recombination_length + 4 + 4){ // pos already incl. ACL header 620 621 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, &conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], conn->acl_recombination_pos); 622 // reset recombination buffer 623 conn->acl_recombination_length = 0; 624 conn->acl_recombination_pos = 0; 625 } 626 break; 627 628 case 0x02: { // first fragment 629 630 // sanity check 631 if (conn->acl_recombination_pos) { 632 log_error( "ACL First Fragment but data in buffer for handle 0x%02x, dropping stale fragments", con_handle); 633 conn->acl_recombination_pos = 0; 634 } 635 636 // peek into L2CAP packet! 637 uint16_t l2cap_length = READ_L2CAP_LENGTH( packet ); 638 639 // log_info( "ACL First Fragment: acl_len %u, l2cap_len %u", acl_length, l2cap_length); 640 641 // compare fragment size to L2CAP packet size 642 if (acl_length >= l2cap_length + 4){ 643 644 // forward fragment as L2CAP packet 645 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, packet, acl_length + 4); 646 647 } else { 648 649 if (acl_length > HCI_ACL_BUFFER_SIZE){ 650 log_error( "ACL First Fragment to large: fragment %u > buffer size %u for handle 0x%02x", 651 4 + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle); 652 return; 653 } 654 655 // store first fragment and tweak acl length for complete package 656 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], packet, acl_length + 4); 657 conn->acl_recombination_pos = acl_length + 4; 658 conn->acl_recombination_length = l2cap_length; 659 bt_store_16(conn->acl_recombination_buffer, HCI_INCOMING_PRE_BUFFER_SIZE + 2, l2cap_length +4); 660 } 661 break; 662 663 } 664 default: 665 log_error( "hci.c: acl_handler called with invalid packet boundary flags %u", acl_flags & 0x03); 666 return; 667 } 668 669 // execute main loop 670 hci_run(); 671 } 672 673 static void hci_shutdown_connection(hci_connection_t *conn){ 674 log_info("Connection closed: handle 0x%x, %s", conn->con_handle, bd_addr_to_str(conn->address)); 675 676 run_loop_remove_timer(&conn->timeout); 677 678 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 679 btstack_memory_hci_connection_free( conn ); 680 681 // now it's gone 682 hci_emit_nr_connections_changed(); 683 } 684 685 static const uint16_t packet_type_sizes[] = { 686 0, HCI_ACL_2DH1_SIZE, HCI_ACL_3DH1_SIZE, HCI_ACL_DM1_SIZE, 687 HCI_ACL_DH1_SIZE, 0, 0, 0, 688 HCI_ACL_2DH3_SIZE, HCI_ACL_3DH3_SIZE, HCI_ACL_DM3_SIZE, HCI_ACL_DH3_SIZE, 689 HCI_ACL_2DH5_SIZE, HCI_ACL_3DH5_SIZE, HCI_ACL_DM5_SIZE, HCI_ACL_DH5_SIZE 690 }; 691 static const uint8_t packet_type_feature_requirement_bit[] = { 692 0, // 3 slot packets 693 1, // 5 slot packets 694 25, // EDR 2 mpbs 695 26, // EDR 3 mbps 696 39, // 3 slot EDR packts 697 40, // 5 slot EDR packet 698 }; 699 static const uint16_t packet_type_feature_packet_mask[] = { 700 0x0f00, // 3 slot packets 701 0xf000, // 5 slot packets 702 0x1102, // EDR 2 mpbs 703 0x2204, // EDR 3 mbps 704 0x0300, // 3 slot EDR packts 705 0x3000, // 5 slot EDR packet 706 }; 707 708 static uint16_t hci_acl_packet_types_for_buffer_size_and_local_features(uint16_t buffer_size, uint8_t * local_supported_features){ 709 // enable packet types based on size 710 uint16_t packet_types = 0; 711 unsigned int i; 712 for (i=0;i<16;i++){ 713 if (packet_type_sizes[i] == 0) continue; 714 if (packet_type_sizes[i] <= buffer_size){ 715 packet_types |= 1 << i; 716 } 717 } 718 // disable packet types due to missing local supported features 719 for (i=0;i<sizeof(packet_type_feature_requirement_bit);i++){ 720 int bit_idx = packet_type_feature_requirement_bit[i]; 721 int feature_set = (local_supported_features[bit_idx >> 3] & (1<<(bit_idx & 7))) != 0; 722 if (feature_set) continue; 723 log_info("Features bit %02u is not set, removing packet types 0x%04x", bit_idx, packet_type_feature_packet_mask[i]); 724 packet_types &= ~packet_type_feature_packet_mask[i]; 725 } 726 // flip bits for "may not be used" 727 packet_types ^= 0x3306; 728 return packet_types; 729 } 730 731 uint16_t hci_usable_acl_packet_types(void){ 732 return hci_stack->packet_types; 733 } 734 735 uint8_t* hci_get_outgoing_packet_buffer(void){ 736 // hci packet buffer is >= acl data packet length 737 return hci_stack->hci_packet_buffer; 738 } 739 740 uint16_t hci_max_acl_data_packet_length(void){ 741 return hci_stack->acl_data_packet_length; 742 } 743 744 int hci_non_flushable_packet_boundary_flag_supported(void){ 745 // No. 54, byte 6, bit 6 746 return (hci_stack->local_supported_features[6] & (1 << 6)) != 0; 747 } 748 749 int hci_ssp_supported(void){ 750 // No. 51, byte 6, bit 3 751 return (hci_stack->local_supported_features[6] & (1 << 3)) != 0; 752 } 753 754 int hci_classic_supported(void){ 755 // No. 37, byte 4, bit 5, = No BR/EDR Support 756 return (hci_stack->local_supported_features[4] & (1 << 5)) == 0; 757 } 758 759 int hci_le_supported(void){ 760 #ifdef HAVE_BLE 761 // No. 37, byte 4, bit 6 = LE Supported (Controller) 762 return (hci_stack->local_supported_features[4] & (1 << 6)) != 0; 763 #else 764 return 0; 765 #endif 766 } 767 768 // get addr type and address used in advertisement packets 769 void hci_le_advertisement_address(uint8_t * addr_type, bd_addr_t * addr){ 770 *addr_type = hci_stack->adv_addr_type; 771 if (hci_stack->adv_addr_type){ 772 memcpy(addr, hci_stack->adv_address, 6); 773 } else { 774 memcpy(addr, hci_stack->local_bd_addr, 6); 775 } 776 } 777 778 #ifdef HAVE_BLE 779 void le_handle_advertisement_report(uint8_t *packet, int size){ 780 int offset = 3; 781 int num_reports = packet[offset]; 782 offset += 1; 783 784 int i; 785 log_info("HCI: handle adv report with num reports: %d", num_reports); 786 uint8_t event[12 + LE_ADVERTISING_DATA_SIZE]; // use upper bound to avoid var size automatic var 787 for (i=0; i<num_reports;i++){ 788 uint8_t data_length = packet[offset + 8]; 789 uint8_t event_size = 10 + data_length; 790 int pos = 0; 791 event[pos++] = GAP_LE_ADVERTISING_REPORT; 792 event[pos++] = event_size; 793 memcpy(&event[pos], &packet[offset], 1+1+6); // event type + address type + address 794 offset += 8; 795 pos += 8; 796 event[pos++] = packet[offset + 1 + data_length]; // rssi 797 event[pos++] = packet[offset++]; //data_length; 798 memcpy(&event[pos], &packet[offset], data_length); 799 pos += data_length; 800 offset += data_length + 1; // rssi 801 hci_dump_packet( HCI_EVENT_PACKET, 0, event, pos); 802 hci_stack->packet_handler(HCI_EVENT_PACKET, event, pos); 803 } 804 } 805 #endif 806 807 static void hci_initializing_event_handler(uint8_t * packet, uint16_t size){ 808 uint8_t command_completed = 0; 809 if ((hci_stack->substate % 2) == 0) return; 810 // odd: waiting for event 811 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 812 uint16_t opcode = READ_BT_16(packet,3); 813 if (opcode == hci_stack->last_cmd_opcode){ 814 command_completed = 1; 815 log_info("Command complete for expected opcode %04x -> new substate %u", opcode, hci_stack->substate >> 1); 816 } else { 817 log_info("Command complete for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 818 } 819 } 820 if (packet[0] == HCI_EVENT_COMMAND_STATUS){ 821 uint8_t status = packet[2]; 822 uint16_t opcode = READ_BT_16(packet,4); 823 if (opcode == hci_stack->last_cmd_opcode){ 824 if (status){ 825 command_completed = 1; 826 log_error("Command status error 0x%02x for expected opcode %04x -> new substate %u", status, opcode, hci_stack->substate >> 1); 827 } else { 828 log_info("Command status OK for expected opcode %04x, waiting for command complete", opcode); 829 } 830 } else { 831 log_info("Command status for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 832 } 833 } 834 835 if (!command_completed) return; 836 837 switch(hci_stack->substate >> 1){ 838 default: 839 hci_stack->substate++; 840 break; 841 } 842 } 843 844 static void hci_initializing_state_machine(){ 845 if (hci_stack->substate % 2) { 846 // odd: waiting for command completion 847 return; 848 } 849 // log_info("hci_init: substate %u", hci_stack->substate >> 1); 850 switch (hci_stack->substate >> 1){ 851 case 0: // RESET 852 hci_state_reset(); 853 854 hci_send_cmd(&hci_reset); 855 if (hci_stack->config == NULL || ((hci_uart_config_t *)hci_stack->config)->baudrate_main == 0){ 856 // skip baud change 857 hci_stack->substate = 2 << 1; 858 } 859 break; 860 case 1: // SEND BAUD CHANGE 861 hci_stack->control->baudrate_cmd(hci_stack->config, ((hci_uart_config_t *)hci_stack->config)->baudrate_main, hci_stack->hci_packet_buffer); 862 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 863 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 864 break; 865 case 2: // LOCAL BAUD CHANGE 866 log_info("Local baud rate change"); 867 hci_stack->hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack->config)->baudrate_main); 868 hci_stack->substate += 2; 869 // break missing here for fall through 870 871 case 3: // SET BD ADDR 872 if ( hci_stack->custom_bd_addr_set && hci_stack->control && hci_stack->control->set_bd_addr_cmd){ 873 log_info("Set Public BD ADDR to %s", bd_addr_to_str(hci_stack->custom_bd_addr)); 874 hci_stack->control->set_bd_addr_cmd(hci_stack->config, hci_stack->custom_bd_addr, hci_stack->hci_packet_buffer); 875 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 876 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 877 break; 878 } 879 hci_stack->substate += 2; 880 // break missing here for fall through 881 882 case 4: 883 log_info("Custom init"); 884 // Custom initialization 885 if (hci_stack->control && hci_stack->control->next_cmd){ 886 int valid_cmd = (*hci_stack->control->next_cmd)(hci_stack->config, hci_stack->hci_packet_buffer); 887 if (valid_cmd){ 888 int size = 3 + hci_stack->hci_packet_buffer[2]; 889 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 890 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, hci_stack->hci_packet_buffer, size); 891 hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack->hci_packet_buffer, size); 892 hci_stack->substate = 3 << 1; // more init commands 893 break; 894 } 895 log_info("hci_run: init script done"); 896 } 897 // otherwise continue 898 hci_send_cmd(&hci_read_bd_addr); 899 break; 900 case 5: 901 hci_send_cmd(&hci_read_buffer_size); 902 break; 903 case 6: 904 hci_send_cmd(&hci_read_local_supported_features); 905 break; 906 case 7: 907 if (hci_le_supported()){ 908 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 909 } else { 910 // Kensington Bluetooth 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 911 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 912 } 913 914 // skip Classic init commands for LE only chipsets 915 if (!hci_classic_supported()){ 916 if (hci_le_supported()){ 917 hci_stack->substate = 12 << 1; // skip all classic command 918 } else { 919 log_error("Neither BR/EDR nor LE supported"); 920 hci_stack->substate = 15 << 1; // skip all 921 } 922 } 923 break; 924 case 8: 925 if (hci_ssp_supported()){ 926 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack->ssp_enable); 927 break; 928 } 929 hci_stack->substate += 2; 930 // break missing here for fall through 931 932 case 9: 933 // ca. 15 sec 934 hci_send_cmd(&hci_write_page_timeout, 0x6000); 935 break; 936 case 10: 937 hci_send_cmd(&hci_write_class_of_device, hci_stack->class_of_device); 938 break; 939 case 11: 940 if (hci_stack->local_name){ 941 hci_send_cmd(&hci_write_local_name, hci_stack->local_name); 942 } else { 943 char hostname[30]; 944 #ifdef EMBEDDED 945 // BTstack-11:22:33:44:55:66 946 strcpy(hostname, "BTstack "); 947 strcat(hostname, bd_addr_to_str(hci_stack->local_bd_addr)); 948 log_info("---> Name %s", hostname); 949 #else 950 // hostname for POSIX systems 951 gethostname(hostname, 30); 952 hostname[29] = '\0'; 953 #endif 954 hci_send_cmd(&hci_write_local_name, hostname); 955 } 956 break; 957 case 12: 958 hci_send_cmd(&hci_write_scan_enable, (hci_stack->connectable << 1) | hci_stack->discoverable); // page scan 959 if (!hci_le_supported()){ 960 // SKIP LE init for Classic only configuration 961 hci_stack->substate = 15 << 1; 962 } 963 break; 964 965 #ifdef HAVE_BLE 966 // LE INIT 967 case 13: 968 hci_send_cmd(&hci_le_read_buffer_size); 969 break; 970 case 14: 971 // LE Supported Host = 1, Simultaneous Host = 0 972 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 973 break; 974 case 15: 975 // LE Scan Parameters: active scanning, 300 ms interval, 30 ms window, public address, accept all advs 976 hci_send_cmd(&hci_le_set_scan_parameters, 1, 0x1e0, 0x30, 0, 0); 977 break; 978 #endif 979 980 // DONE 981 case 16: 982 // done. 983 hci_stack->state = HCI_STATE_WORKING; 984 hci_emit_state(); 985 break; 986 default: 987 break; 988 } 989 hci_stack->substate++; 990 } 991 992 // avoid huge local variables 993 #ifndef EMBEDDED 994 static device_name_t device_name; 995 #endif 996 static void event_handler(uint8_t *packet, int size){ 997 998 uint16_t event_length = packet[1]; 999 1000 // assert packet is complete 1001 if (size != event_length + 2){ 1002 log_error("hci.c: event_handler called with event packet of wrong size %u, expected %u => dropping packet", size, event_length + 2); 1003 return; 1004 } 1005 1006 bd_addr_t addr; 1007 bd_addr_type_t addr_type; 1008 uint8_t link_type; 1009 hci_con_handle_t handle; 1010 hci_connection_t * conn; 1011 int i; 1012 1013 // log_info("HCI:EVENT:%02x", packet[0]); 1014 1015 switch (packet[0]) { 1016 1017 case HCI_EVENT_COMMAND_COMPLETE: 1018 // get num cmd packets 1019 // log_info("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u", hci_stack->num_cmd_packets, packet[2]); 1020 hci_stack->num_cmd_packets = packet[2]; 1021 1022 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 1023 // from offset 5 1024 // status 1025 // "The HC_ACL_Data_Packet_Length return parameter will be used to determine the size of the L2CAP segments contained in ACL Data Packets" 1026 hci_stack->acl_data_packet_length = READ_BT_16(packet, 6); 1027 hci_stack->sco_data_packet_length = packet[8]; 1028 hci_stack->acl_packets_total_num = packet[9]; 1029 hci_stack->sco_packets_total_num = packet[10]; 1030 1031 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1032 // determine usable ACL payload size 1033 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->acl_data_packet_length){ 1034 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1035 } 1036 log_info("hci_read_buffer_size: used size %u, count %u", 1037 hci_stack->acl_data_packet_length, hci_stack->acl_packets_total_num); 1038 } 1039 } 1040 #ifdef HAVE_BLE 1041 if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_buffer_size)){ 1042 hci_stack->le_data_packets_length = READ_BT_16(packet, 6); 1043 hci_stack->le_acl_packets_total_num = packet[8]; 1044 // determine usable ACL payload size 1045 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->le_data_packets_length){ 1046 hci_stack->le_data_packets_length = HCI_ACL_PAYLOAD_SIZE; 1047 } 1048 log_info("hci_le_read_buffer_size: size %u, count %u", hci_stack->le_data_packets_length, hci_stack->le_acl_packets_total_num); 1049 } 1050 #endif 1051 // Dump local address 1052 if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)) { 1053 bt_flip_addr(hci_stack->local_bd_addr, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1]); 1054 log_info("Local Address, Status: 0x%02x: Addr: %s", 1055 packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE], bd_addr_to_str(hci_stack->local_bd_addr)); 1056 } 1057 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1058 hci_emit_discoverable_enabled(hci_stack->discoverable); 1059 } 1060 // Note: HCI init checks 1061 if (COMMAND_COMPLETE_EVENT(packet, hci_read_local_supported_features)){ 1062 memcpy(hci_stack->local_supported_features, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1], 8); 1063 log_info("Local Supported Features: 0x%02x%02x%02x%02x%02x%02x%02x%02x", 1064 hci_stack->local_supported_features[0], hci_stack->local_supported_features[1], 1065 hci_stack->local_supported_features[2], hci_stack->local_supported_features[3], 1066 hci_stack->local_supported_features[4], hci_stack->local_supported_features[5], 1067 hci_stack->local_supported_features[6], hci_stack->local_supported_features[7]); 1068 1069 // determine usable ACL packet types based on host buffer size and supported features 1070 hci_stack->packet_types = hci_acl_packet_types_for_buffer_size_and_local_features(HCI_ACL_PAYLOAD_SIZE, &hci_stack->local_supported_features[0]); 1071 log_info("packet types %04x", hci_stack->packet_types); 1072 1073 // Classic/LE 1074 log_info("BR/EDR support %u, LE support %u", hci_classic_supported(), hci_le_supported()); 1075 } 1076 break; 1077 1078 case HCI_EVENT_COMMAND_STATUS: 1079 // get num cmd packets 1080 // log_info("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u", hci_stack->num_cmd_packets, packet[3]); 1081 hci_stack->num_cmd_packets = packet[3]; 1082 break; 1083 1084 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:{ 1085 int offset = 3; 1086 for (i=0; i<packet[2];i++){ 1087 handle = READ_BT_16(packet, offset); 1088 offset += 2; 1089 uint16_t num_packets = READ_BT_16(packet, offset); 1090 offset += 2; 1091 1092 conn = hci_connection_for_handle(handle); 1093 if (!conn){ 1094 log_error("hci_number_completed_packet lists unused con handle %u", handle); 1095 continue; 1096 } 1097 1098 if (conn->num_acl_packets_sent >= num_packets){ 1099 conn->num_acl_packets_sent -= num_packets; 1100 } else { 1101 log_error("hci_number_completed_packets, more slots freed then sent."); 1102 conn->num_acl_packets_sent = 0; 1103 } 1104 // log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u", num_packets, handle, conn->num_acl_packets_sent); 1105 } 1106 break; 1107 } 1108 case HCI_EVENT_CONNECTION_REQUEST: 1109 bt_flip_addr(addr, &packet[2]); 1110 // TODO: eval COD 8-10 1111 link_type = packet[11]; 1112 log_info("Connection_incoming: %s, type %u", bd_addr_to_str(addr), link_type); 1113 if (link_type == 1) { // ACL 1114 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1115 if (!conn) { 1116 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 1117 } 1118 if (!conn) { 1119 // CONNECTION REJECTED DUE TO LIMITED RESOURCES (0X0D) 1120 hci_stack->decline_reason = 0x0d; 1121 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1122 break; 1123 } 1124 conn->state = RECEIVED_CONNECTION_REQUEST; 1125 hci_run(); 1126 } else { 1127 // SYNCHRONOUS CONNECTION LIMIT TO A DEVICE EXCEEDED (0X0A) 1128 hci_stack->decline_reason = 0x0a; 1129 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1130 } 1131 break; 1132 1133 case HCI_EVENT_CONNECTION_COMPLETE: 1134 // Connection management 1135 bt_flip_addr(addr, &packet[5]); 1136 log_info("Connection_complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 1137 addr_type = BD_ADDR_TYPE_CLASSIC; 1138 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1139 if (conn) { 1140 if (!packet[2]){ 1141 conn->state = OPEN; 1142 conn->con_handle = READ_BT_16(packet, 3); 1143 conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES; 1144 1145 // restart timer 1146 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1147 run_loop_add_timer(&conn->timeout); 1148 1149 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1150 1151 hci_emit_nr_connections_changed(); 1152 } else { 1153 int notify_dedicated_bonding_failed = conn->bonding_flags & BONDING_DEDICATED; 1154 uint8_t status = packet[2]; 1155 bd_addr_t bd_address; 1156 memcpy(&bd_address, conn->address, 6); 1157 1158 // connection failed, remove entry 1159 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1160 btstack_memory_hci_connection_free( conn ); 1161 1162 // notify client if dedicated bonding 1163 if (notify_dedicated_bonding_failed){ 1164 log_info("hci notify_dedicated_bonding_failed"); 1165 hci_emit_dedicated_bonding_result(bd_address, status); 1166 } 1167 1168 // if authentication error, also delete link key 1169 if (packet[2] == 0x05) { 1170 hci_drop_link_key_for_bd_addr(&addr); 1171 } 1172 } 1173 } 1174 break; 1175 1176 case HCI_EVENT_SYNCHRONOUS_CONNECTION_COMPLETE: 1177 bt_flip_addr(addr, &packet[5]); 1178 log_info("Synchronous Connection Complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 1179 if (!packet[2]){ 1180 // connection failed 1181 break; 1182 } 1183 // conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_SCO); 1184 // if (!conn) break; 1185 break; 1186 1187 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 1188 handle = READ_BT_16(packet, 3); 1189 conn = hci_connection_for_handle(handle); 1190 if (!conn) break; 1191 if (!packet[2]){ 1192 uint8_t * features = &packet[5]; 1193 if (features[6] & (1 << 3)){ 1194 conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP; 1195 } 1196 } 1197 conn->bonding_flags |= BONDING_RECEIVED_REMOTE_FEATURES; 1198 log_info("HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE, bonding flags %x", conn->bonding_flags); 1199 if (conn->bonding_flags & BONDING_DEDICATED){ 1200 conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 1201 } 1202 break; 1203 1204 case HCI_EVENT_LINK_KEY_REQUEST: 1205 log_info("HCI_EVENT_LINK_KEY_REQUEST"); 1206 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 1207 // non-bondable mode: link key negative reply will be sent by HANDLE_LINK_KEY_REQUEST 1208 if (hci_stack->bondable && !hci_stack->remote_device_db) break; 1209 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], HANDLE_LINK_KEY_REQUEST); 1210 hci_run(); 1211 // request handled by hci_run() as HANDLE_LINK_KEY_REQUEST gets set 1212 return; 1213 1214 case HCI_EVENT_LINK_KEY_NOTIFICATION: { 1215 bt_flip_addr(addr, &packet[2]); 1216 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1217 if (!conn) break; 1218 conn->authentication_flags |= RECV_LINK_KEY_NOTIFICATION; 1219 link_key_type_t link_key_type = (link_key_type_t)packet[24]; 1220 // Change Connection Encryption keeps link key type 1221 if (link_key_type != CHANGED_COMBINATION_KEY){ 1222 conn->link_key_type = link_key_type; 1223 } 1224 if (!hci_stack->remote_device_db) break; 1225 hci_stack->remote_device_db->put_link_key(&addr, (link_key_t *) &packet[8], conn->link_key_type); 1226 // still forward event to allow dismiss of pairing dialog 1227 break; 1228 } 1229 1230 case HCI_EVENT_PIN_CODE_REQUEST: 1231 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], LEGACY_PAIRING_ACTIVE); 1232 // non-bondable mode: pin code negative reply will be sent 1233 if (!hci_stack->bondable){ 1234 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], DENY_PIN_CODE_REQUEST); 1235 hci_run(); 1236 return; 1237 } 1238 // PIN CODE REQUEST means the link key request didn't succee -> delete stored link key 1239 if (!hci_stack->remote_device_db) break; 1240 bt_flip_addr(addr, &packet[2]); 1241 hci_stack->remote_device_db->delete_link_key(&addr); 1242 break; 1243 1244 case HCI_EVENT_IO_CAPABILITY_REQUEST: 1245 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_IO_CAPABILITIES_REQUEST); 1246 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_IO_CAPABILITIES_REPLY); 1247 break; 1248 1249 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 1250 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1251 if (!hci_stack->ssp_auto_accept) break; 1252 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_CONFIRM_REPLY); 1253 break; 1254 1255 case HCI_EVENT_USER_PASSKEY_REQUEST: 1256 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1257 if (!hci_stack->ssp_auto_accept) break; 1258 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_PASSKEY_REPLY); 1259 break; 1260 1261 case HCI_EVENT_ENCRYPTION_CHANGE: 1262 handle = READ_BT_16(packet, 3); 1263 conn = hci_connection_for_handle(handle); 1264 if (!conn) break; 1265 if (packet[2] == 0) { 1266 if (packet[5]){ 1267 conn->authentication_flags |= CONNECTION_ENCRYPTED; 1268 } else { 1269 conn->authentication_flags &= ~CONNECTION_ENCRYPTED; 1270 } 1271 } 1272 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1273 break; 1274 1275 case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT: 1276 handle = READ_BT_16(packet, 3); 1277 conn = hci_connection_for_handle(handle); 1278 if (!conn) break; 1279 1280 // dedicated bonding: send result and disconnect 1281 if (conn->bonding_flags & BONDING_DEDICATED){ 1282 conn->bonding_flags &= ~BONDING_DEDICATED; 1283 conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE; 1284 conn->bonding_status = packet[2]; 1285 break; 1286 } 1287 1288 if (packet[2] == 0 && gap_security_level_for_link_key_type(conn->link_key_type) >= conn->requested_security_level){ 1289 // link key sufficient for requested security 1290 conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 1291 break; 1292 } 1293 // not enough 1294 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1295 break; 1296 1297 #ifndef EMBEDDED 1298 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 1299 if (!hci_stack->remote_device_db) break; 1300 if (packet[2]) break; // status not ok 1301 bt_flip_addr(addr, &packet[3]); 1302 // fix for invalid remote names - terminate on 0xff 1303 for (i=0; i<248;i++){ 1304 if (packet[9+i] == 0xff){ 1305 packet[9+i] = 0; 1306 break; 1307 } 1308 } 1309 memset(&device_name, 0, sizeof(device_name_t)); 1310 strncpy((char*) device_name, (char*) &packet[9], 248); 1311 hci_stack->remote_device_db->put_name(&addr, &device_name); 1312 break; 1313 1314 case HCI_EVENT_INQUIRY_RESULT: 1315 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:{ 1316 if (!hci_stack->remote_device_db) break; 1317 // first send inq result packet 1318 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1319 // then send cached remote names 1320 int offset = 3; 1321 for (i=0; i<packet[2];i++){ 1322 bt_flip_addr(addr, &packet[offset]); 1323 offset += 14; // 6 + 1 + 1 + 1 + 3 + 2; 1324 if (hci_stack->remote_device_db->get_name(&addr, &device_name)){ 1325 hci_emit_remote_name_cached(&addr, &device_name); 1326 } 1327 } 1328 return; 1329 } 1330 #endif 1331 1332 // HCI_EVENT_DISCONNECTION_COMPLETE 1333 // has been split, to first notify stack before shutting connection down 1334 // see end of function, too. 1335 case HCI_EVENT_DISCONNECTION_COMPLETE: 1336 if (packet[2]) break; // status != 0 1337 handle = READ_BT_16(packet, 3); 1338 hci_connection_t * conn = hci_connection_for_handle(handle); 1339 if (!conn) break; // no conn struct anymore 1340 conn->state = RECEIVED_DISCONNECTION_COMPLETE; 1341 break; 1342 1343 case HCI_EVENT_HARDWARE_ERROR: 1344 if(hci_stack->control && hci_stack->control->hw_error){ 1345 (*hci_stack->control->hw_error)(); 1346 } else { 1347 // if no special requests, just reboot stack 1348 hci_power_control_off(); 1349 hci_power_control_on(); 1350 } 1351 break; 1352 1353 case DAEMON_EVENT_HCI_PACKET_SENT: 1354 // release packet buffer only for asynchronous transport and if there are not further fragements 1355 if (hci_transport_synchronous()) { 1356 log_error("Synchronous HCI Transport shouldn't send DAEMON_EVENT_HCI_PACKET_SENT"); 1357 return; // instead of break: to avoid re-entering hci_run() 1358 } 1359 if (hci_stack->acl_fragmentation_total_size) break; 1360 hci_release_packet_buffer(); 1361 break; 1362 1363 #ifdef HAVE_BLE 1364 case HCI_EVENT_LE_META: 1365 switch (packet[2]){ 1366 case HCI_SUBEVENT_LE_ADVERTISING_REPORT: 1367 log_info("advertising report received"); 1368 if (hci_stack->le_scanning_state != LE_SCANNING) break; 1369 le_handle_advertisement_report(packet, size); 1370 break; 1371 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 1372 // Connection management 1373 bt_flip_addr(addr, &packet[8]); 1374 addr_type = (bd_addr_type_t)packet[7]; 1375 log_info("LE Connection_complete (status=%u) type %u, %s", packet[3], addr_type, bd_addr_to_str(addr)); 1376 // LE connections are auto-accepted, so just create a connection if there isn't one already 1377 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1378 if (packet[3]){ 1379 if (conn){ 1380 // outgoing connection failed, remove entry 1381 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1382 btstack_memory_hci_connection_free( conn ); 1383 } 1384 // if authentication error, also delete link key 1385 if (packet[3] == 0x05) { 1386 hci_drop_link_key_for_bd_addr(&addr); 1387 } 1388 break; 1389 } 1390 if (!conn){ 1391 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 1392 } 1393 if (!conn){ 1394 // no memory 1395 break; 1396 } 1397 1398 conn->state = OPEN; 1399 conn->con_handle = READ_BT_16(packet, 4); 1400 1401 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 1402 1403 // restart timer 1404 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1405 // run_loop_add_timer(&conn->timeout); 1406 1407 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1408 1409 hci_emit_nr_connections_changed(); 1410 break; 1411 1412 // log_info("LE buffer size: %u, count %u", READ_BT_16(packet,6), packet[8]); 1413 1414 default: 1415 break; 1416 } 1417 break; 1418 #endif 1419 default: 1420 break; 1421 } 1422 1423 // handle BT initialization 1424 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1425 hci_initializing_event_handler(packet, size); 1426 } 1427 1428 // help with BT sleep 1429 if (hci_stack->state == HCI_STATE_FALLING_ASLEEP 1430 && hci_stack->substate == 1 1431 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1432 hci_stack->substate++; 1433 } 1434 1435 // notify upper stack 1436 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1437 1438 // moved here to give upper stack a chance to close down everything with hci_connection_t intact 1439 if (packet[0] == HCI_EVENT_DISCONNECTION_COMPLETE){ 1440 if (!packet[2]){ 1441 handle = READ_BT_16(packet, 3); 1442 hci_connection_t * conn = hci_connection_for_handle(handle); 1443 if (conn) { 1444 uint8_t status = conn->bonding_status; 1445 uint16_t flags = conn->bonding_flags; 1446 bd_addr_t bd_address; 1447 memcpy(&bd_address, conn->address, 6); 1448 hci_shutdown_connection(conn); 1449 // connection struct is gone, don't access anymore 1450 if (flags & BONDING_EMIT_COMPLETE_ON_DISCONNECT){ 1451 hci_emit_dedicated_bonding_result(bd_address, status); 1452 } 1453 } 1454 } 1455 } 1456 1457 // execute main loop 1458 hci_run(); 1459 } 1460 1461 static void sco_handler(uint8_t * packet, uint16_t size){ 1462 // not handled yet 1463 } 1464 1465 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1466 hci_dump_packet(packet_type, 1, packet, size); 1467 switch (packet_type) { 1468 case HCI_EVENT_PACKET: 1469 event_handler(packet, size); 1470 break; 1471 case HCI_ACL_DATA_PACKET: 1472 acl_handler(packet, size); 1473 break; 1474 case HCI_SCO_DATA_PACKET: 1475 sco_handler(packet, size); 1476 default: 1477 break; 1478 } 1479 } 1480 1481 /** Register HCI packet handlers */ 1482 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 1483 hci_stack->packet_handler = handler; 1484 } 1485 1486 static void hci_state_reset(){ 1487 // no connections yet 1488 hci_stack->connections = NULL; 1489 1490 // keep discoverable/connectable as this has been requested by the client(s) 1491 // hci_stack->discoverable = 0; 1492 // hci_stack->connectable = 0; 1493 // hci_stack->bondable = 1; 1494 1495 // buffer is free 1496 hci_stack->hci_packet_buffer_reserved = 0; 1497 1498 // no pending cmds 1499 hci_stack->decline_reason = 0; 1500 hci_stack->new_scan_enable_value = 0xff; 1501 1502 // LE 1503 hci_stack->adv_addr_type = 0; 1504 memset(hci_stack->adv_address, 0, 6); 1505 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1506 hci_stack->le_scan_type = 0xff; 1507 hci_stack->le_connection_parameter_range.le_conn_interval_min = 0x0006; 1508 hci_stack->le_connection_parameter_range.le_conn_interval_max = 0x0C80; 1509 hci_stack->le_connection_parameter_range.le_conn_latency_min = 0x0000; 1510 hci_stack->le_connection_parameter_range.le_conn_latency_max = 0x03E8; 1511 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = 0x000A; 1512 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = 0x0C80; 1513 } 1514 1515 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 1516 1517 #ifdef HAVE_MALLOC 1518 if (!hci_stack) { 1519 hci_stack = (hci_stack_t*) malloc(sizeof(hci_stack_t)); 1520 } 1521 #else 1522 hci_stack = &hci_stack_static; 1523 #endif 1524 memset(hci_stack, 0, sizeof(hci_stack_t)); 1525 1526 // reference to use transport layer implementation 1527 hci_stack->hci_transport = transport; 1528 1529 // references to used control implementation 1530 hci_stack->control = control; 1531 1532 // reference to used config 1533 hci_stack->config = config; 1534 1535 // higher level handler 1536 hci_stack->packet_handler = dummy_handler; 1537 1538 // store and open remote device db 1539 hci_stack->remote_device_db = remote_device_db; 1540 if (hci_stack->remote_device_db) { 1541 hci_stack->remote_device_db->open(); 1542 } 1543 1544 // max acl payload size defined in config.h 1545 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1546 1547 // register packet handlers with transport 1548 transport->register_packet_handler(&packet_handler); 1549 1550 hci_stack->state = HCI_STATE_OFF; 1551 1552 // class of device 1553 hci_stack->class_of_device = 0x007a020c; // Smartphone 1554 1555 // bondable by default 1556 hci_stack->bondable = 1; 1557 1558 // Secure Simple Pairing default: enable, no I/O capabilities, general bonding, mitm not required, auto accept 1559 hci_stack->ssp_enable = 1; 1560 hci_stack->ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 1561 hci_stack->ssp_authentication_requirement = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING; 1562 hci_stack->ssp_auto_accept = 1; 1563 1564 hci_state_reset(); 1565 } 1566 1567 void hci_close(){ 1568 // close remote device db 1569 if (hci_stack->remote_device_db) { 1570 hci_stack->remote_device_db->close(); 1571 } 1572 while (hci_stack->connections) { 1573 // cancel all l2cap connections 1574 hci_emit_disconnection_complete(((hci_connection_t *) hci_stack->connections)->con_handle, 0x16); // terminated by local host 1575 hci_shutdown_connection((hci_connection_t *) hci_stack->connections); 1576 } 1577 hci_power_control(HCI_POWER_OFF); 1578 1579 #ifdef HAVE_MALLOC 1580 free(hci_stack); 1581 #endif 1582 hci_stack = NULL; 1583 } 1584 1585 void hci_set_class_of_device(uint32_t class_of_device){ 1586 hci_stack->class_of_device = class_of_device; 1587 } 1588 1589 // Set Public BD ADDR - passed on to Bluetooth chipset if supported in bt_control_h 1590 void hci_set_bd_addr(bd_addr_t addr){ 1591 memcpy(hci_stack->custom_bd_addr, addr, 6); 1592 hci_stack->custom_bd_addr_set = 1; 1593 } 1594 1595 void hci_disable_l2cap_timeout_check(){ 1596 disable_l2cap_timeouts = 1; 1597 } 1598 // State-Module-Driver overview 1599 // state module low-level 1600 // HCI_STATE_OFF off close 1601 // HCI_STATE_INITIALIZING, on open 1602 // HCI_STATE_WORKING, on open 1603 // HCI_STATE_HALTING, on open 1604 // HCI_STATE_SLEEPING, off/sleep close 1605 // HCI_STATE_FALLING_ASLEEP on open 1606 1607 static int hci_power_control_on(void){ 1608 1609 // power on 1610 int err = 0; 1611 if (hci_stack->control && hci_stack->control->on){ 1612 err = (*hci_stack->control->on)(hci_stack->config); 1613 } 1614 if (err){ 1615 log_error( "POWER_ON failed"); 1616 hci_emit_hci_open_failed(); 1617 return err; 1618 } 1619 1620 // open low-level device 1621 err = hci_stack->hci_transport->open(hci_stack->config); 1622 if (err){ 1623 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1624 if (hci_stack->control && hci_stack->control->off){ 1625 (*hci_stack->control->off)(hci_stack->config); 1626 } 1627 hci_emit_hci_open_failed(); 1628 return err; 1629 } 1630 return 0; 1631 } 1632 1633 static void hci_power_control_off(void){ 1634 1635 log_info("hci_power_control_off"); 1636 1637 // close low-level device 1638 hci_stack->hci_transport->close(hci_stack->config); 1639 1640 log_info("hci_power_control_off - hci_transport closed"); 1641 1642 // power off 1643 if (hci_stack->control && hci_stack->control->off){ 1644 (*hci_stack->control->off)(hci_stack->config); 1645 } 1646 1647 log_info("hci_power_control_off - control closed"); 1648 1649 hci_stack->state = HCI_STATE_OFF; 1650 } 1651 1652 static void hci_power_control_sleep(void){ 1653 1654 log_info("hci_power_control_sleep"); 1655 1656 #if 0 1657 // don't close serial port during sleep 1658 1659 // close low-level device 1660 hci_stack->hci_transport->close(hci_stack->config); 1661 #endif 1662 1663 // sleep mode 1664 if (hci_stack->control && hci_stack->control->sleep){ 1665 (*hci_stack->control->sleep)(hci_stack->config); 1666 } 1667 1668 hci_stack->state = HCI_STATE_SLEEPING; 1669 } 1670 1671 static int hci_power_control_wake(void){ 1672 1673 log_info("hci_power_control_wake"); 1674 1675 // wake on 1676 if (hci_stack->control && hci_stack->control->wake){ 1677 (*hci_stack->control->wake)(hci_stack->config); 1678 } 1679 1680 #if 0 1681 // open low-level device 1682 int err = hci_stack->hci_transport->open(hci_stack->config); 1683 if (err){ 1684 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1685 if (hci_stack->control && hci_stack->control->off){ 1686 (*hci_stack->control->off)(hci_stack->config); 1687 } 1688 hci_emit_hci_open_failed(); 1689 return err; 1690 } 1691 #endif 1692 1693 return 0; 1694 } 1695 1696 static void hci_power_transition_to_initializing(void){ 1697 // set up state machine 1698 hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent 1699 hci_stack->hci_packet_buffer_reserved = 0; 1700 hci_stack->state = HCI_STATE_INITIALIZING; 1701 hci_stack->substate = 0; 1702 } 1703 1704 int hci_power_control(HCI_POWER_MODE power_mode){ 1705 1706 log_info("hci_power_control: %u, current mode %u", power_mode, hci_stack->state); 1707 1708 int err = 0; 1709 switch (hci_stack->state){ 1710 1711 case HCI_STATE_OFF: 1712 switch (power_mode){ 1713 case HCI_POWER_ON: 1714 err = hci_power_control_on(); 1715 if (err) { 1716 log_error("hci_power_control_on() error %u", err); 1717 return err; 1718 } 1719 hci_power_transition_to_initializing(); 1720 break; 1721 case HCI_POWER_OFF: 1722 // do nothing 1723 break; 1724 case HCI_POWER_SLEEP: 1725 // do nothing (with SLEEP == OFF) 1726 break; 1727 } 1728 break; 1729 1730 case HCI_STATE_INITIALIZING: 1731 switch (power_mode){ 1732 case HCI_POWER_ON: 1733 // do nothing 1734 break; 1735 case HCI_POWER_OFF: 1736 // no connections yet, just turn it off 1737 hci_power_control_off(); 1738 break; 1739 case HCI_POWER_SLEEP: 1740 // no connections yet, just turn it off 1741 hci_power_control_sleep(); 1742 break; 1743 } 1744 break; 1745 1746 case HCI_STATE_WORKING: 1747 switch (power_mode){ 1748 case HCI_POWER_ON: 1749 // do nothing 1750 break; 1751 case HCI_POWER_OFF: 1752 // see hci_run 1753 hci_stack->state = HCI_STATE_HALTING; 1754 break; 1755 case HCI_POWER_SLEEP: 1756 // see hci_run 1757 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1758 hci_stack->substate = 0; 1759 break; 1760 } 1761 break; 1762 1763 case HCI_STATE_HALTING: 1764 switch (power_mode){ 1765 case HCI_POWER_ON: 1766 hci_power_transition_to_initializing(); 1767 break; 1768 case HCI_POWER_OFF: 1769 // do nothing 1770 break; 1771 case HCI_POWER_SLEEP: 1772 // see hci_run 1773 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1774 hci_stack->substate = 0; 1775 break; 1776 } 1777 break; 1778 1779 case HCI_STATE_FALLING_ASLEEP: 1780 switch (power_mode){ 1781 case HCI_POWER_ON: 1782 1783 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1784 // nothing to do, if H4 supports power management 1785 if (bt_control_iphone_power_management_enabled()){ 1786 hci_stack->state = HCI_STATE_INITIALIZING; 1787 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1788 break; 1789 } 1790 #endif 1791 hci_power_transition_to_initializing(); 1792 break; 1793 case HCI_POWER_OFF: 1794 // see hci_run 1795 hci_stack->state = HCI_STATE_HALTING; 1796 break; 1797 case HCI_POWER_SLEEP: 1798 // do nothing 1799 break; 1800 } 1801 break; 1802 1803 case HCI_STATE_SLEEPING: 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_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1812 hci_update_scan_enable(); 1813 break; 1814 } 1815 #endif 1816 err = hci_power_control_wake(); 1817 if (err) return err; 1818 hci_power_transition_to_initializing(); 1819 break; 1820 case HCI_POWER_OFF: 1821 hci_stack->state = HCI_STATE_HALTING; 1822 break; 1823 case HCI_POWER_SLEEP: 1824 // do nothing 1825 break; 1826 } 1827 break; 1828 } 1829 1830 // create internal event 1831 hci_emit_state(); 1832 1833 // trigger next/first action 1834 hci_run(); 1835 1836 return 0; 1837 } 1838 1839 static void hci_update_scan_enable(void){ 1840 // 2 = page scan, 1 = inq scan 1841 hci_stack->new_scan_enable_value = hci_stack->connectable << 1 | hci_stack->discoverable; 1842 hci_run(); 1843 } 1844 1845 void hci_discoverable_control(uint8_t enable){ 1846 if (enable) enable = 1; // normalize argument 1847 1848 if (hci_stack->discoverable == enable){ 1849 hci_emit_discoverable_enabled(hci_stack->discoverable); 1850 return; 1851 } 1852 1853 hci_stack->discoverable = enable; 1854 hci_update_scan_enable(); 1855 } 1856 1857 void hci_connectable_control(uint8_t enable){ 1858 if (enable) enable = 1; // normalize argument 1859 1860 // don't emit event 1861 if (hci_stack->connectable == enable) return; 1862 1863 hci_stack->connectable = enable; 1864 hci_update_scan_enable(); 1865 } 1866 1867 bd_addr_t * hci_local_bd_addr(void){ 1868 return &hci_stack->local_bd_addr; 1869 } 1870 1871 void hci_run(){ 1872 1873 hci_connection_t * connection; 1874 linked_item_t * it; 1875 1876 // send continuation fragments first, as they block the prepared packet buffer 1877 if (hci_stack->acl_fragmentation_total_size > 0) { 1878 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(hci_stack->hci_packet_buffer); 1879 if (hci_can_send_prepared_acl_packet_now(con_handle)){ 1880 hci_connection_t *connection = hci_connection_for_handle(con_handle); 1881 if (connection) { 1882 hci_send_acl_packet_fragments(connection); 1883 return; 1884 } 1885 // connection gone -> discard further fragments 1886 hci_stack->acl_fragmentation_total_size = 0; 1887 hci_stack->acl_fragmentation_pos = 0; 1888 } 1889 } 1890 1891 if (!hci_can_send_command_packet_now()) return; 1892 1893 // global/non-connection oriented commands 1894 1895 // decline incoming connections 1896 if (hci_stack->decline_reason){ 1897 uint8_t reason = hci_stack->decline_reason; 1898 hci_stack->decline_reason = 0; 1899 hci_send_cmd(&hci_reject_connection_request, hci_stack->decline_addr, reason); 1900 return; 1901 } 1902 1903 // send scan enable 1904 if (hci_stack->state == HCI_STATE_WORKING && hci_stack->new_scan_enable_value != 0xff && hci_classic_supported()){ 1905 hci_send_cmd(&hci_write_scan_enable, hci_stack->new_scan_enable_value); 1906 hci_stack->new_scan_enable_value = 0xff; 1907 return; 1908 } 1909 1910 #ifdef HAVE_BLE 1911 // handle le scan 1912 if (hci_stack->state == HCI_STATE_WORKING){ 1913 switch(hci_stack->le_scanning_state){ 1914 case LE_START_SCAN: 1915 hci_stack->le_scanning_state = LE_SCANNING; 1916 hci_send_cmd(&hci_le_set_scan_enable, 1, 0); 1917 return; 1918 1919 case LE_STOP_SCAN: 1920 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1921 hci_send_cmd(&hci_le_set_scan_enable, 0, 0); 1922 return; 1923 default: 1924 break; 1925 } 1926 if (hci_stack->le_scan_type != 0xff){ 1927 // defaults: active scanning, accept all advertisement packets 1928 int scan_type = hci_stack->le_scan_type; 1929 hci_stack->le_scan_type = 0xff; 1930 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); 1931 return; 1932 } 1933 } 1934 #endif 1935 1936 // send pending HCI commands 1937 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 1938 connection = (hci_connection_t *) it; 1939 1940 switch(connection->state){ 1941 case SEND_CREATE_CONNECTION: 1942 switch(connection->address_type){ 1943 case BD_ADDR_TYPE_CLASSIC: 1944 log_info("sending hci_create_connection"); 1945 hci_send_cmd(&hci_create_connection, connection->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 1946 break; 1947 default: 1948 #ifdef HAVE_BLE 1949 log_info("sending hci_le_create_connection"); 1950 hci_send_cmd(&hci_le_create_connection, 1951 0x0060, // scan interval: 60 ms 1952 0x0030, // scan interval: 30 ms 1953 0, // don't use whitelist 1954 connection->address_type, // peer address type 1955 connection->address, // peer bd addr 1956 hci_stack->adv_addr_type, // our addr type: 1957 0x0008, // conn interval min 1958 0x0018, // conn interval max 1959 0, // conn latency 1960 0x0048, // supervision timeout 1961 0x0001, // min ce length 1962 0x0001 // max ce length 1963 ); 1964 1965 connection->state = SENT_CREATE_CONNECTION; 1966 #endif 1967 break; 1968 } 1969 return; 1970 1971 case RECEIVED_CONNECTION_REQUEST: 1972 log_info("sending hci_accept_connection_request"); 1973 connection->state = ACCEPTED_CONNECTION_REQUEST; 1974 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 1975 return; 1976 1977 #ifdef HAVE_BLE 1978 case SEND_CANCEL_CONNECTION: 1979 connection->state = SENT_CANCEL_CONNECTION; 1980 hci_send_cmd(&hci_le_create_connection_cancel); 1981 return; 1982 #endif 1983 case SEND_DISCONNECT: 1984 connection->state = SENT_DISCONNECT; 1985 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1986 return; 1987 1988 default: 1989 break; 1990 } 1991 1992 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 1993 log_info("responding to link key request"); 1994 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 1995 link_key_t link_key; 1996 link_key_type_t link_key_type; 1997 if ( hci_stack->remote_device_db 1998 && hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type) 1999 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 2000 connection->link_key_type = link_key_type; 2001 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 2002 } else { 2003 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 2004 } 2005 return; 2006 } 2007 2008 if (connection->authentication_flags & DENY_PIN_CODE_REQUEST){ 2009 log_info("denying to pin request"); 2010 connectionClearAuthenticationFlags(connection, DENY_PIN_CODE_REQUEST); 2011 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 2012 return; 2013 } 2014 2015 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 2016 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 2017 log_info("IO Capability Request received, stack bondable %u, io cap %u", hci_stack->bondable, hci_stack->ssp_io_capability); 2018 if (hci_stack->bondable && (hci_stack->ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN)){ 2019 // tweak authentication requirements 2020 uint8_t authreq = hci_stack->ssp_authentication_requirement; 2021 if (connection->bonding_flags & BONDING_DEDICATED){ 2022 authreq = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING; 2023 } 2024 if (gap_mitm_protection_required_for_security_level(connection->requested_security_level)){ 2025 authreq |= 1; 2026 } 2027 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack->ssp_io_capability, NULL, authreq); 2028 } else { 2029 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 2030 } 2031 return; 2032 } 2033 2034 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 2035 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 2036 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 2037 return; 2038 } 2039 2040 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 2041 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 2042 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 2043 return; 2044 } 2045 2046 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 2047 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 2048 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 2049 return; 2050 } 2051 2052 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 2053 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 2054 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 2055 return; 2056 } 2057 if (connection->bonding_flags & BONDING_DISCONNECT_DEDICATED_DONE){ 2058 connection->bonding_flags &= ~BONDING_DISCONNECT_DEDICATED_DONE; 2059 connection->bonding_flags |= BONDING_EMIT_COMPLETE_ON_DISCONNECT; 2060 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // authentication done 2061 return; 2062 } 2063 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 2064 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 2065 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 2066 return; 2067 } 2068 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 2069 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 2070 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 2071 return; 2072 } 2073 2074 #ifdef HAVE_BLE 2075 if (connection->le_con_parameter_update_state == CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS){ 2076 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 2077 2078 uint16_t connection_interval_min = connection->le_conn_interval_min; 2079 connection->le_conn_interval_min = 0; 2080 hci_send_cmd(&hci_le_connection_update, connection->con_handle, connection_interval_min, 2081 connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout, 2082 0x0000, 0xffff); 2083 } 2084 #endif 2085 } 2086 2087 switch (hci_stack->state){ 2088 case HCI_STATE_INITIALIZING: 2089 hci_initializing_state_machine(); 2090 break; 2091 2092 case HCI_STATE_HALTING: 2093 2094 log_info("HCI_STATE_HALTING"); 2095 // close all open connections 2096 connection = (hci_connection_t *) hci_stack->connections; 2097 if (connection){ 2098 2099 // send disconnect 2100 if (!hci_can_send_command_packet_now()) return; 2101 2102 log_info("HCI_STATE_HALTING, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2103 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2104 2105 // send disconnected event right away - causes higher layer connections to get closed, too. 2106 hci_shutdown_connection(connection); 2107 return; 2108 } 2109 log_info("HCI_STATE_HALTING, calling off"); 2110 2111 // switch mode 2112 hci_power_control_off(); 2113 2114 log_info("HCI_STATE_HALTING, emitting state"); 2115 hci_emit_state(); 2116 log_info("HCI_STATE_HALTING, done"); 2117 break; 2118 2119 case HCI_STATE_FALLING_ASLEEP: 2120 switch(hci_stack->substate) { 2121 case 0: 2122 log_info("HCI_STATE_FALLING_ASLEEP"); 2123 // close all open connections 2124 connection = (hci_connection_t *) hci_stack->connections; 2125 2126 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2127 // don't close connections, if H4 supports power management 2128 if (bt_control_iphone_power_management_enabled()){ 2129 connection = NULL; 2130 } 2131 #endif 2132 if (connection){ 2133 2134 // send disconnect 2135 if (!hci_can_send_command_packet_now()) return; 2136 2137 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2138 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2139 2140 // send disconnected event right away - causes higher layer connections to get closed, too. 2141 hci_shutdown_connection(connection); 2142 return; 2143 } 2144 2145 if (hci_classic_supported()){ 2146 // disable page and inquiry scan 2147 if (!hci_can_send_command_packet_now()) return; 2148 2149 log_info("HCI_STATE_HALTING, disabling inq scans"); 2150 hci_send_cmd(&hci_write_scan_enable, hci_stack->connectable << 1); // drop inquiry scan but keep page scan 2151 2152 // continue in next sub state 2153 hci_stack->substate++; 2154 break; 2155 } 2156 // fall through for ble-only chips 2157 2158 case 2: 2159 log_info("HCI_STATE_HALTING, calling sleep"); 2160 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2161 // don't actually go to sleep, if H4 supports power management 2162 if (bt_control_iphone_power_management_enabled()){ 2163 // SLEEP MODE reached 2164 hci_stack->state = HCI_STATE_SLEEPING; 2165 hci_emit_state(); 2166 break; 2167 } 2168 #endif 2169 // switch mode 2170 hci_power_control_sleep(); // changes hci_stack->state to SLEEP 2171 hci_emit_state(); 2172 break; 2173 2174 default: 2175 break; 2176 } 2177 break; 2178 2179 default: 2180 break; 2181 } 2182 } 2183 2184 int hci_send_cmd_packet(uint8_t *packet, int size){ 2185 bd_addr_t addr; 2186 hci_connection_t * conn; 2187 // house-keeping 2188 2189 // create_connection? 2190 if (IS_COMMAND(packet, hci_create_connection)){ 2191 bt_flip_addr(addr, &packet[3]); 2192 log_info("Create_connection to %s", bd_addr_to_str(addr)); 2193 2194 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2195 if (!conn){ 2196 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2197 if (!conn){ 2198 // notify client that alloc failed 2199 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 2200 return 0; // don't sent packet to controller 2201 } 2202 conn->state = SEND_CREATE_CONNECTION; 2203 } 2204 log_info("conn state %u", conn->state); 2205 switch (conn->state){ 2206 // if connection active exists 2207 case OPEN: 2208 // and OPEN, emit connection complete command, don't send to controller 2209 hci_emit_connection_complete(conn, 0); 2210 return 0; 2211 case SEND_CREATE_CONNECTION: 2212 // connection created by hci, e.g. dedicated bonding 2213 break; 2214 default: 2215 // otherwise, just ignore as it is already in the open process 2216 return 0; 2217 } 2218 conn->state = SENT_CREATE_CONNECTION; 2219 } 2220 2221 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 2222 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 2223 } 2224 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 2225 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 2226 } 2227 2228 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 2229 if (hci_stack->remote_device_db){ 2230 bt_flip_addr(addr, &packet[3]); 2231 hci_stack->remote_device_db->delete_link_key(&addr); 2232 } 2233 } 2234 2235 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply) 2236 || IS_COMMAND(packet, hci_pin_code_request_reply)){ 2237 bt_flip_addr(addr, &packet[3]); 2238 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2239 if (conn){ 2240 connectionClearAuthenticationFlags(conn, LEGACY_PAIRING_ACTIVE); 2241 } 2242 } 2243 2244 if (IS_COMMAND(packet, hci_user_confirmation_request_negative_reply) 2245 || IS_COMMAND(packet, hci_user_confirmation_request_reply) 2246 || IS_COMMAND(packet, hci_user_passkey_request_negative_reply) 2247 || IS_COMMAND(packet, hci_user_passkey_request_reply)) { 2248 bt_flip_addr(addr, &packet[3]); 2249 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2250 if (conn){ 2251 connectionClearAuthenticationFlags(conn, SSP_PAIRING_ACTIVE); 2252 } 2253 } 2254 2255 #ifdef HAVE_BLE 2256 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 2257 hci_stack->adv_addr_type = packet[8]; 2258 } 2259 if (IS_COMMAND(packet, hci_le_set_random_address)){ 2260 bt_flip_addr(hci_stack->adv_address, &packet[3]); 2261 } 2262 #endif 2263 2264 hci_stack->num_cmd_packets--; 2265 2266 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, packet, size); 2267 int err = hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 2268 2269 // release packet buffer for synchronous transport implementations 2270 if (hci_transport_synchronous() && (packet == hci_stack->hci_packet_buffer)){ 2271 hci_stack->hci_packet_buffer_reserved = 0; 2272 } 2273 2274 return err; 2275 } 2276 2277 // disconnect because of security block 2278 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 2279 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2280 if (!connection) return; 2281 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 2282 } 2283 2284 2285 // Configure Secure Simple Pairing 2286 2287 // enable will enable SSP during init 2288 void hci_ssp_set_enable(int enable){ 2289 hci_stack->ssp_enable = enable; 2290 } 2291 2292 int hci_local_ssp_activated(){ 2293 return hci_ssp_supported() && hci_stack->ssp_enable; 2294 } 2295 2296 // if set, BTstack will respond to io capability request using authentication requirement 2297 void hci_ssp_set_io_capability(int io_capability){ 2298 hci_stack->ssp_io_capability = io_capability; 2299 } 2300 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 2301 hci_stack->ssp_authentication_requirement = authentication_requirement; 2302 } 2303 2304 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 2305 void hci_ssp_set_auto_accept(int auto_accept){ 2306 hci_stack->ssp_auto_accept = auto_accept; 2307 } 2308 2309 /** 2310 * pre: numcmds >= 0 - it's allowed to send a command to the controller 2311 */ 2312 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 2313 2314 if (!hci_can_send_command_packet_now()){ 2315 log_error("hci_send_cmd called but cannot send packet now"); 2316 return 0; 2317 } 2318 2319 // for HCI INITIALIZATION 2320 // log_info("hci_send_cmd: opcode %04x", cmd->opcode); 2321 hci_stack->last_cmd_opcode = cmd->opcode; 2322 2323 hci_reserve_packet_buffer(); 2324 uint8_t * packet = hci_stack->hci_packet_buffer; 2325 2326 va_list argptr; 2327 va_start(argptr, cmd); 2328 uint16_t size = hci_create_cmd_internal(packet, cmd, argptr); 2329 va_end(argptr); 2330 2331 return hci_send_cmd_packet(packet, size); 2332 } 2333 2334 // Create various non-HCI events. 2335 // TODO: generalize, use table similar to hci_create_command 2336 2337 void hci_emit_state(){ 2338 log_info("BTSTACK_EVENT_STATE %u", hci_stack->state); 2339 uint8_t event[3]; 2340 event[0] = BTSTACK_EVENT_STATE; 2341 event[1] = sizeof(event) - 2; 2342 event[2] = hci_stack->state; 2343 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2344 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2345 } 2346 2347 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 2348 uint8_t event[13]; 2349 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 2350 event[1] = sizeof(event) - 2; 2351 event[2] = status; 2352 bt_store_16(event, 3, conn->con_handle); 2353 bt_flip_addr(&event[5], conn->address); 2354 event[11] = 1; // ACL connection 2355 event[12] = 0; // encryption disabled 2356 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2357 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2358 } 2359 2360 void hci_emit_le_connection_complete(uint8_t address_type, bd_addr_t * address, uint16_t conn_handle, uint8_t status){ 2361 uint8_t event[21]; 2362 event[0] = HCI_EVENT_LE_META; 2363 event[1] = sizeof(event) - 2; 2364 event[2] = HCI_SUBEVENT_LE_CONNECTION_COMPLETE; 2365 event[3] = status; 2366 bt_store_16(event, 4, conn_handle); 2367 event[6] = 0; // TODO: role 2368 event[7] = address_type; 2369 bt_flip_addr(&event[8], *address); 2370 bt_store_16(event, 14, 0); // interval 2371 bt_store_16(event, 16, 0); // latency 2372 bt_store_16(event, 18, 0); // supervision timeout 2373 event[20] = 0; // master clock accuracy 2374 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2375 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2376 } 2377 2378 void hci_emit_disconnection_complete(uint16_t handle, uint8_t reason){ 2379 uint8_t event[6]; 2380 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 2381 event[1] = sizeof(event) - 2; 2382 event[2] = 0; // status = OK 2383 bt_store_16(event, 3, handle); 2384 event[5] = reason; 2385 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2386 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2387 } 2388 2389 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 2390 if (disable_l2cap_timeouts) return; 2391 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 2392 uint8_t event[4]; 2393 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 2394 event[1] = sizeof(event) - 2; 2395 bt_store_16(event, 2, conn->con_handle); 2396 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2397 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2398 } 2399 2400 void hci_emit_nr_connections_changed(){ 2401 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 2402 uint8_t event[3]; 2403 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 2404 event[1] = sizeof(event) - 2; 2405 event[2] = nr_hci_connections(); 2406 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2407 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2408 } 2409 2410 void hci_emit_hci_open_failed(){ 2411 log_info("BTSTACK_EVENT_POWERON_FAILED"); 2412 uint8_t event[2]; 2413 event[0] = BTSTACK_EVENT_POWERON_FAILED; 2414 event[1] = sizeof(event) - 2; 2415 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2416 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2417 } 2418 2419 #ifndef EMBEDDED 2420 void hci_emit_btstack_version() { 2421 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 2422 uint8_t event[6]; 2423 event[0] = BTSTACK_EVENT_VERSION; 2424 event[1] = sizeof(event) - 2; 2425 event[2] = BTSTACK_MAJOR; 2426 event[3] = BTSTACK_MINOR; 2427 bt_store_16(event, 4, BTSTACK_REVISION); 2428 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2429 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2430 } 2431 #endif 2432 2433 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 2434 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 2435 uint8_t event[3]; 2436 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 2437 event[1] = sizeof(event) - 2; 2438 event[2] = enabled; 2439 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2440 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2441 } 2442 2443 void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){ 2444 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 2445 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 2446 event[1] = sizeof(event) - 2 - 1; 2447 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 2448 bt_flip_addr(&event[3], *addr); 2449 memcpy(&event[9], name, 248); 2450 2451 event[9+248] = 0; // assert \0 for log_info 2452 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(*addr), &event[9]); 2453 2454 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 2455 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 2456 } 2457 2458 void hci_emit_discoverable_enabled(uint8_t enabled){ 2459 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 2460 uint8_t event[3]; 2461 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 2462 event[1] = sizeof(event) - 2; 2463 event[2] = enabled; 2464 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2465 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2466 } 2467 2468 void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){ 2469 log_info("hci_emit_security_level %u for handle %x", level, con_handle); 2470 uint8_t event[5]; 2471 int pos = 0; 2472 event[pos++] = GAP_SECURITY_LEVEL; 2473 event[pos++] = sizeof(event) - 2; 2474 bt_store_16(event, 2, con_handle); 2475 pos += 2; 2476 event[pos++] = level; 2477 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2478 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2479 } 2480 2481 void hci_emit_dedicated_bonding_result(bd_addr_t address, uint8_t status){ 2482 log_info("hci_emit_dedicated_bonding_result %u ", status); 2483 uint8_t event[9]; 2484 int pos = 0; 2485 event[pos++] = GAP_DEDICATED_BONDING_COMPLETED; 2486 event[pos++] = sizeof(event) - 2; 2487 event[pos++] = status; 2488 bt_flip_addr( * (bd_addr_t *) &event[pos], address); 2489 pos += 6; 2490 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2491 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2492 } 2493 2494 // query if remote side supports SSP 2495 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 2496 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2497 if (!connection) return 0; 2498 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 2499 } 2500 2501 int hci_ssp_supported_on_both_sides(hci_con_handle_t handle){ 2502 return hci_local_ssp_activated() && hci_remote_ssp_supported(handle); 2503 } 2504 2505 // GAP API 2506 /** 2507 * @bbrief enable/disable bonding. default is enabled 2508 * @praram enabled 2509 */ 2510 void gap_set_bondable_mode(int enable){ 2511 hci_stack->bondable = enable ? 1 : 0; 2512 } 2513 2514 /** 2515 * @brief map link keys to security levels 2516 */ 2517 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 2518 switch (link_key_type){ 2519 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 2520 return LEVEL_4; 2521 case COMBINATION_KEY: 2522 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 2523 return LEVEL_3; 2524 default: 2525 return LEVEL_2; 2526 } 2527 } 2528 2529 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 2530 if (!connection) return LEVEL_0; 2531 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 2532 return gap_security_level_for_link_key_type(connection->link_key_type); 2533 } 2534 2535 2536 int gap_mitm_protection_required_for_security_level(gap_security_level_t level){ 2537 log_info("gap_mitm_protection_required_for_security_level %u", level); 2538 return level > LEVEL_2; 2539 } 2540 2541 /** 2542 * @brief get current security level 2543 */ 2544 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 2545 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2546 if (!connection) return LEVEL_0; 2547 return gap_security_level_for_connection(connection); 2548 } 2549 2550 /** 2551 * @brief request connection to device to 2552 * @result GAP_AUTHENTICATION_RESULT 2553 */ 2554 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 2555 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2556 if (!connection){ 2557 hci_emit_security_level(con_handle, LEVEL_0); 2558 return; 2559 } 2560 gap_security_level_t current_level = gap_security_level(con_handle); 2561 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 2562 if (current_level >= requested_level){ 2563 hci_emit_security_level(con_handle, current_level); 2564 return; 2565 } 2566 2567 connection->requested_security_level = requested_level; 2568 2569 #if 0 2570 // sending encryption request without a link key results in an error. 2571 // TODO: figure out how to use it properly 2572 2573 // would enabling ecnryption suffice (>= LEVEL_2)? 2574 if (hci_stack->remote_device_db){ 2575 link_key_type_t link_key_type; 2576 link_key_t link_key; 2577 if (hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type)){ 2578 if (gap_security_level_for_link_key_type(link_key_type) >= requested_level){ 2579 connection->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 2580 return; 2581 } 2582 } 2583 } 2584 #endif 2585 2586 // try to authenticate connection 2587 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 2588 hci_run(); 2589 } 2590 2591 /** 2592 * @brief start dedicated bonding with device. disconnect after bonding 2593 * @param device 2594 * @param request MITM protection 2595 * @result GAP_DEDICATED_BONDING_COMPLETE 2596 */ 2597 int gap_dedicated_bonding(bd_addr_t device, int mitm_protection_required){ 2598 2599 // create connection state machine 2600 hci_connection_t * connection = create_connection_for_bd_addr_and_type(device, BD_ADDR_TYPE_CLASSIC); 2601 2602 if (!connection){ 2603 return BTSTACK_MEMORY_ALLOC_FAILED; 2604 } 2605 2606 // delete linkn key 2607 hci_drop_link_key_for_bd_addr( (bd_addr_t *) &device); 2608 2609 // configure LEVEL_2/3, dedicated bonding 2610 connection->state = SEND_CREATE_CONNECTION; 2611 connection->requested_security_level = mitm_protection_required ? LEVEL_3 : LEVEL_2; 2612 log_info("gap_dedicated_bonding, mitm %u -> level %u", mitm_protection_required, connection->requested_security_level); 2613 connection->bonding_flags = BONDING_DEDICATED; 2614 2615 // wait for GAP Security Result and send GAP Dedicated Bonding complete 2616 2617 // handle: connnection failure (connection complete != ok) 2618 // handle: authentication failure 2619 // handle: disconnect on done 2620 2621 hci_run(); 2622 2623 return 0; 2624 } 2625 2626 void gap_set_local_name(const char * local_name){ 2627 hci_stack->local_name = local_name; 2628 } 2629 2630 le_command_status_t le_central_start_scan(){ 2631 if (hci_stack->le_scanning_state == LE_SCANNING) return BLE_PERIPHERAL_OK; 2632 hci_stack->le_scanning_state = LE_START_SCAN; 2633 hci_run(); 2634 return BLE_PERIPHERAL_OK; 2635 } 2636 2637 le_command_status_t le_central_stop_scan(){ 2638 if ( hci_stack->le_scanning_state == LE_SCAN_IDLE) return BLE_PERIPHERAL_OK; 2639 hci_stack->le_scanning_state = LE_STOP_SCAN; 2640 hci_run(); 2641 return BLE_PERIPHERAL_OK; 2642 } 2643 2644 void le_central_set_scan_parameters(uint8_t scan_type, uint16_t scan_interval, uint16_t scan_window){ 2645 hci_stack->le_scan_type = scan_type; 2646 hci_stack->le_scan_interval = scan_interval; 2647 hci_stack->le_scan_window = scan_window; 2648 hci_run(); 2649 } 2650 2651 le_command_status_t le_central_connect(bd_addr_t * addr, bd_addr_type_t addr_type){ 2652 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 2653 if (!conn){ 2654 log_info("le_central_connect: no connection exists yet, creating context"); 2655 conn = create_connection_for_bd_addr_and_type(*addr, addr_type); 2656 if (!conn){ 2657 // notify client that alloc failed 2658 hci_emit_le_connection_complete(addr_type, addr, 0, BTSTACK_MEMORY_ALLOC_FAILED); 2659 log_info("le_central_connect: failed to alloc hci_connection_t"); 2660 return BLE_PERIPHERAL_NOT_CONNECTED; // don't sent packet to controller 2661 } 2662 conn->state = SEND_CREATE_CONNECTION; 2663 log_info("le_central_connect: send create connection next"); 2664 hci_run(); 2665 return BLE_PERIPHERAL_OK; 2666 } 2667 2668 if (!hci_is_le_connection(conn) || 2669 conn->state == SEND_CREATE_CONNECTION || 2670 conn->state == SENT_CREATE_CONNECTION) { 2671 hci_emit_le_connection_complete(conn->address_type, &conn->address, 0, ERROR_CODE_COMMAND_DISALLOWED); 2672 log_error("le_central_connect: classic connection or connect is already being created"); 2673 return BLE_PERIPHERAL_IN_WRONG_STATE; 2674 } 2675 2676 log_info("le_central_connect: context exists with state %u", conn->state); 2677 hci_emit_le_connection_complete(conn->address_type, &conn->address, conn->con_handle, 0); 2678 hci_run(); 2679 return BLE_PERIPHERAL_OK; 2680 } 2681 2682 // @assumption: only a single outgoing LE Connection exists 2683 static hci_connection_t * le_central_get_outgoing_connection(){ 2684 linked_item_t *it; 2685 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 2686 hci_connection_t * conn = (hci_connection_t *) it; 2687 if (!hci_is_le_connection(conn)) continue; 2688 switch (conn->state){ 2689 case SEND_CREATE_CONNECTION: 2690 case SENT_CREATE_CONNECTION: 2691 return conn; 2692 default: 2693 break; 2694 }; 2695 } 2696 return NULL; 2697 } 2698 2699 le_command_status_t le_central_connect_cancel(){ 2700 hci_connection_t * conn = le_central_get_outgoing_connection(); 2701 switch (conn->state){ 2702 case SEND_CREATE_CONNECTION: 2703 // skip sending create connection and emit event instead 2704 hci_emit_le_connection_complete(conn->address_type, &conn->address, 0, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 2705 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 2706 btstack_memory_hci_connection_free( conn ); 2707 break; 2708 case SENT_CREATE_CONNECTION: 2709 // request to send cancel connection 2710 conn->state = SEND_CANCEL_CONNECTION; 2711 hci_run(); 2712 break; 2713 default: 2714 break; 2715 } 2716 return BLE_PERIPHERAL_OK; 2717 } 2718 2719 /** 2720 * @brief Updates the connection parameters for a given LE connection 2721 * @param handle 2722 * @param conn_interval_min (unit: 1.25ms) 2723 * @param conn_interval_max (unit: 1.25ms) 2724 * @param conn_latency 2725 * @param supervision_timeout (unit: 10ms) 2726 * @returns 0 if ok 2727 */ 2728 int gap_update_connection_parameters(hci_con_handle_t con_handle, uint16_t conn_interval_min, 2729 uint16_t conn_interval_max, uint16_t conn_latency, uint16_t supervision_timeout){ 2730 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2731 if (!connection) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2732 connection->le_conn_interval_min = conn_interval_min; 2733 connection->le_conn_interval_max = conn_interval_max; 2734 connection->le_conn_latency = conn_latency; 2735 connection->le_supervision_timeout = supervision_timeout; 2736 return 0; 2737 } 2738 2739 le_command_status_t gap_disconnect(hci_con_handle_t handle){ 2740 hci_connection_t * conn = hci_connection_for_handle(handle); 2741 if (!conn){ 2742 hci_emit_disconnection_complete(handle, 0); 2743 return BLE_PERIPHERAL_OK; 2744 } 2745 conn->state = SEND_DISCONNECT; 2746 hci_run(); 2747 return BLE_PERIPHERAL_OK; 2748 } 2749 2750 void hci_disconnect_all(){ 2751 linked_list_iterator_t it; 2752 linked_list_iterator_init(&it, &hci_stack->connections); 2753 while (linked_list_iterator_has_next(&it)){ 2754 hci_connection_t * con = (hci_connection_t*) linked_list_iterator_next(&it); 2755 if (con->state == SENT_DISCONNECT) continue; 2756 con->state = SEND_DISCONNECT; 2757 } 2758 hci_run(); 2759 } 2760