1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 /* 39 * hci.c 40 * 41 * Created by Matthias Ringwald on 4/29/09. 42 * 43 */ 44 45 #include "btstack-config.h" 46 47 #include "hci.h" 48 #include "gap.h" 49 50 #include <stdarg.h> 51 #include <string.h> 52 #include <stdio.h> 53 54 #ifndef EMBEDDED 55 #ifdef _WIN32 56 #include "Winsock2.h" 57 #else 58 #include <unistd.h> // gethostbyname 59 #endif 60 #include <btstack/version.h> 61 #endif 62 63 #include "btstack_memory.h" 64 #include "debug.h" 65 #include "hci_dump.h" 66 67 #include <btstack/linked_list.h> 68 #include <btstack/hci_cmds.h> 69 70 #define HCI_CONNECTION_TIMEOUT_MS 10000 71 72 #define HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP 11 73 74 #ifdef USE_BLUETOOL 75 #include "../platforms/ios/src/bt_control_iphone.h" 76 #endif 77 78 static void hci_update_scan_enable(void); 79 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection); 80 static void hci_connection_timeout_handler(timer_source_t *timer); 81 static void hci_connection_timestamp(hci_connection_t *connection); 82 static int hci_power_control_on(void); 83 static void hci_power_control_off(void); 84 static void hci_state_reset(); 85 86 // the STACK is here 87 #ifndef HAVE_MALLOC 88 static hci_stack_t hci_stack_static; 89 #endif 90 static hci_stack_t * hci_stack = NULL; 91 92 // test helper 93 static uint8_t disable_l2cap_timeouts = 0; 94 95 /** 96 * create connection for given address 97 * 98 * @return connection OR NULL, if no memory left 99 */ 100 static hci_connection_t * create_connection_for_bd_addr_and_type(bd_addr_t addr, bd_addr_type_t addr_type){ 101 log_info("create_connection_for_addr %s, type %x", bd_addr_to_str(addr), addr_type); 102 hci_connection_t * conn = btstack_memory_hci_connection_get(); 103 if (!conn) return NULL; 104 memset(conn, 0, sizeof(hci_connection_t)); 105 BD_ADDR_COPY(conn->address, addr); 106 conn->address_type = addr_type; 107 conn->con_handle = 0xffff; 108 conn->authentication_flags = AUTH_FLAGS_NONE; 109 conn->bonding_flags = 0; 110 conn->requested_security_level = LEVEL_0; 111 linked_item_set_user(&conn->timeout.item, conn); 112 conn->timeout.process = hci_connection_timeout_handler; 113 hci_connection_timestamp(conn); 114 conn->acl_recombination_length = 0; 115 conn->acl_recombination_pos = 0; 116 conn->num_acl_packets_sent = 0; 117 conn->num_sco_packets_sent = 0; 118 conn->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 119 linked_list_add(&hci_stack->connections, (linked_item_t *) conn); 120 return conn; 121 } 122 123 124 /** 125 * get le connection parameter range 126 * 127 * @return le connection parameter range struct 128 */ 129 le_connection_parameter_range_t gap_le_get_connection_parameter_range(){ 130 return hci_stack->le_connection_parameter_range; 131 } 132 133 /** 134 * set le connection parameter range 135 * 136 */ 137 138 void gap_le_set_connection_parameter_range(le_connection_parameter_range_t range){ 139 hci_stack->le_connection_parameter_range.le_conn_interval_min = range.le_conn_interval_min; 140 hci_stack->le_connection_parameter_range.le_conn_interval_max = range.le_conn_interval_max; 141 hci_stack->le_connection_parameter_range.le_conn_interval_min = range.le_conn_latency_min; 142 hci_stack->le_connection_parameter_range.le_conn_interval_max = range.le_conn_latency_max; 143 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = range.le_supervision_timeout_min; 144 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = range.le_supervision_timeout_max; 145 } 146 147 /** 148 * get hci connections iterator 149 * 150 * @return hci connections iterator 151 */ 152 153 void hci_connections_get_iterator(linked_list_iterator_t *it){ 154 linked_list_iterator_init(it, &hci_stack->connections); 155 } 156 157 /** 158 * get connection for a given handle 159 * 160 * @return connection OR NULL, if not found 161 */ 162 hci_connection_t * hci_connection_for_handle(hci_con_handle_t con_handle){ 163 linked_list_iterator_t it; 164 linked_list_iterator_init(&it, &hci_stack->connections); 165 while (linked_list_iterator_has_next(&it)){ 166 hci_connection_t * item = (hci_connection_t *) linked_list_iterator_next(&it); 167 if ( item->con_handle == con_handle ) { 168 return item; 169 } 170 } 171 return NULL; 172 } 173 174 /** 175 * get connection for given address 176 * 177 * @return connection OR NULL, if not found 178 */ 179 hci_connection_t * hci_connection_for_bd_addr_and_type(bd_addr_t addr, bd_addr_type_t addr_type){ 180 linked_list_iterator_t it; 181 linked_list_iterator_init(&it, &hci_stack->connections); 182 while (linked_list_iterator_has_next(&it)){ 183 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 184 if (connection->address_type != addr_type) continue; 185 if (memcmp(addr, connection->address, 6) != 0) continue; 186 return connection; 187 } 188 return NULL; 189 } 190 191 static void hci_connection_timeout_handler(timer_source_t *timer){ 192 hci_connection_t * connection = (hci_connection_t *) linked_item_get_user(&timer->item); 193 #ifdef HAVE_TIME 194 struct timeval tv; 195 gettimeofday(&tv, NULL); 196 if (tv.tv_sec >= connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000) { 197 // connections might be timed out 198 hci_emit_l2cap_check_timeout(connection); 199 } 200 #endif 201 #ifdef HAVE_TICK 202 if (embedded_get_ticks() > connection->timestamp + embedded_ticks_for_ms(HCI_CONNECTION_TIMEOUT_MS)){ 203 // connections might be timed out 204 hci_emit_l2cap_check_timeout(connection); 205 } 206 #endif 207 run_loop_set_timer(timer, HCI_CONNECTION_TIMEOUT_MS); 208 run_loop_add_timer(timer); 209 } 210 211 static void hci_connection_timestamp(hci_connection_t *connection){ 212 #ifdef HAVE_TIME 213 gettimeofday(&connection->timestamp, NULL); 214 #endif 215 #ifdef HAVE_TICK 216 connection->timestamp = embedded_get_ticks(); 217 #endif 218 } 219 220 221 inline static void connectionSetAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 222 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags | flags); 223 } 224 225 inline static void connectionClearAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 226 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags & ~flags); 227 } 228 229 230 /** 231 * add authentication flags and reset timer 232 * @note: assumes classic connection 233 * @note: bd_addr is passed in as litle endian uint8_t * as it is called from parsing packets 234 */ 235 static void hci_add_connection_flags_for_flipped_bd_addr(uint8_t *bd_addr, hci_authentication_flags_t flags){ 236 bd_addr_t addr; 237 bt_flip_addr(addr, bd_addr); 238 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 239 if (conn) { 240 connectionSetAuthenticationFlags(conn, flags); 241 hci_connection_timestamp(conn); 242 } 243 } 244 245 int hci_authentication_active_for_handle(hci_con_handle_t handle){ 246 hci_connection_t * conn = hci_connection_for_handle(handle); 247 if (!conn) return 0; 248 if (conn->authentication_flags & LEGACY_PAIRING_ACTIVE) return 1; 249 if (conn->authentication_flags & SSP_PAIRING_ACTIVE) return 1; 250 return 0; 251 } 252 253 void hci_drop_link_key_for_bd_addr(bd_addr_t addr){ 254 if (hci_stack->remote_device_db) { 255 hci_stack->remote_device_db->delete_link_key(addr); 256 } 257 } 258 259 int hci_is_le_connection(hci_connection_t * connection){ 260 return connection->address_type == BD_ADDR_TYPE_LE_PUBLIC || 261 connection->address_type == BD_ADDR_TYPE_LE_RANDOM; 262 } 263 264 265 /** 266 * count connections 267 */ 268 static int nr_hci_connections(void){ 269 int count = 0; 270 linked_item_t *it; 271 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next, count++); 272 return count; 273 } 274 275 /** 276 * Dummy handler called by HCI 277 */ 278 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 279 } 280 281 uint8_t hci_number_outgoing_packets(hci_con_handle_t handle){ 282 hci_connection_t * connection = hci_connection_for_handle(handle); 283 if (!connection) { 284 log_error("hci_number_outgoing_packets: connection for handle %u does not exist!", handle); 285 return 0; 286 } 287 return connection->num_acl_packets_sent; 288 } 289 290 uint8_t hci_number_free_acl_slots_for_handle(hci_con_handle_t con_handle){ 291 292 int num_packets_sent_classic = 0; 293 int num_packets_sent_le = 0; 294 295 bd_addr_type_t address_type = BD_ADDR_TYPE_UNKNOWN; 296 297 linked_item_t *it; 298 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 299 hci_connection_t * connection = (hci_connection_t *) it; 300 if (connection->address_type == BD_ADDR_TYPE_CLASSIC){ 301 num_packets_sent_classic += connection->num_acl_packets_sent; 302 } else { 303 num_packets_sent_le += connection->num_acl_packets_sent; 304 } 305 // ignore connections that are not open, e.g., in state RECEIVED_DISCONNECTION_COMPLETE 306 if (connection->con_handle == con_handle && connection->state == OPEN){ 307 address_type = connection->address_type; 308 } 309 } 310 311 int free_slots_classic = hci_stack->acl_packets_total_num - num_packets_sent_classic; 312 int free_slots_le = 0; 313 314 if (free_slots_classic < 0){ 315 log_error("hci_number_free_acl_slots: outgoing classic packets (%u) > total classic packets (%u)", num_packets_sent_classic, hci_stack->acl_packets_total_num); 316 return 0; 317 } 318 319 if (hci_stack->le_acl_packets_total_num){ 320 // if we have LE slots, they are used 321 free_slots_le = hci_stack->le_acl_packets_total_num - num_packets_sent_le; 322 if (free_slots_le < 0){ 323 log_error("hci_number_free_acl_slots: outgoing le packets (%u) > total le packets (%u)", num_packets_sent_le, hci_stack->le_acl_packets_total_num); 324 return 0; 325 } 326 } else { 327 // otherwise, classic slots are used for LE, too 328 free_slots_classic -= num_packets_sent_le; 329 if (free_slots_classic < 0){ 330 log_error("hci_number_free_acl_slots: outgoing classic + le packets (%u + %u) > total packets (%u)", num_packets_sent_classic, num_packets_sent_le, hci_stack->acl_packets_total_num); 331 return 0; 332 } 333 } 334 335 switch (address_type){ 336 case BD_ADDR_TYPE_UNKNOWN: 337 log_error("hci_number_free_acl_slots: handle 0x%04x not in connection list", con_handle); 338 return 0; 339 340 case BD_ADDR_TYPE_CLASSIC: 341 return free_slots_classic; 342 343 default: 344 if (hci_stack->le_acl_packets_total_num){ 345 return free_slots_le; 346 } 347 return free_slots_classic; 348 } 349 } 350 351 int hci_number_free_sco_slots_for_handle(hci_con_handle_t handle){ 352 int num_sco_packets_sent = 0; 353 linked_item_t *it; 354 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 355 hci_connection_t * connection = (hci_connection_t *) it; 356 num_sco_packets_sent += connection->num_sco_packets_sent; 357 } 358 if (num_sco_packets_sent > hci_stack->sco_packets_total_num){ 359 log_info("hci_number_free_sco_slots_for_handle: outgoing packets (%u) > total packets ()", num_sco_packets_sent, hci_stack->sco_packets_total_num); 360 return 0; 361 } 362 return hci_stack->sco_packets_total_num - num_sco_packets_sent; 363 } 364 365 // new functions replacing hci_can_send_packet_now[_using_packet_buffer] 366 int hci_can_send_command_packet_now(void){ 367 if (hci_stack->hci_packet_buffer_reserved) return 0; 368 369 // check for async hci transport implementations 370 if (hci_stack->hci_transport->can_send_packet_now){ 371 if (!hci_stack->hci_transport->can_send_packet_now(HCI_COMMAND_DATA_PACKET)){ 372 return 0; 373 } 374 } 375 376 return hci_stack->num_cmd_packets > 0; 377 } 378 379 int hci_can_send_prepared_acl_packet_now(hci_con_handle_t con_handle) { 380 // check for async hci transport implementations 381 if (hci_stack->hci_transport->can_send_packet_now){ 382 if (!hci_stack->hci_transport->can_send_packet_now(HCI_ACL_DATA_PACKET)){ 383 return 0; 384 } 385 } 386 return hci_number_free_acl_slots_for_handle(con_handle) > 0; 387 } 388 389 int hci_can_send_acl_packet_now(hci_con_handle_t con_handle){ 390 if (hci_stack->hci_packet_buffer_reserved) return 0; 391 return hci_can_send_prepared_acl_packet_now(con_handle); 392 } 393 394 int hci_can_send_prepared_sco_packet_now(hci_con_handle_t con_handle){ 395 if (hci_stack->hci_transport->can_send_packet_now){ 396 if (!hci_stack->hci_transport->can_send_packet_now(HCI_SCO_DATA_PACKET)){ 397 return 0; 398 } 399 } 400 return hci_number_free_sco_slots_for_handle(con_handle) > 0; 401 } 402 403 int hci_can_send_sco_packet_now(hci_con_handle_t con_handle){ 404 if (hci_stack->hci_packet_buffer_reserved) return 0; 405 return hci_can_send_prepared_sco_packet_now(con_handle); 406 } 407 408 // used for internal checks in l2cap[-le].c 409 int hci_is_packet_buffer_reserved(void){ 410 return hci_stack->hci_packet_buffer_reserved; 411 } 412 413 // reserves outgoing packet buffer. @returns 1 if successful 414 int hci_reserve_packet_buffer(void){ 415 if (hci_stack->hci_packet_buffer_reserved) { 416 log_error("hci_reserve_packet_buffer called but buffer already reserved"); 417 return 0; 418 } 419 hci_stack->hci_packet_buffer_reserved = 1; 420 return 1; 421 } 422 423 void hci_release_packet_buffer(void){ 424 hci_stack->hci_packet_buffer_reserved = 0; 425 } 426 427 // assumption: synchronous implementations don't provide can_send_packet_now as they don't keep the buffer after the call 428 int hci_transport_synchronous(void){ 429 return hci_stack->hci_transport->can_send_packet_now == NULL; 430 } 431 432 uint16_t hci_max_acl_le_data_packet_length(void){ 433 return hci_stack->le_data_packets_length > 0 ? hci_stack->le_data_packets_length : hci_stack->acl_data_packet_length; 434 } 435 436 static int hci_send_acl_packet_fragments(hci_connection_t *connection){ 437 438 // log_info("hci_send_acl_packet_fragments %u/%u (con 0x%04x)", hci_stack->acl_fragmentation_pos, hci_stack->acl_fragmentation_total_size, connection->con_handle); 439 440 // max ACL data packet length depends on connection type (LE vs. Classic) and available buffers 441 uint16_t max_acl_data_packet_length = hci_stack->acl_data_packet_length; 442 if (hci_is_le_connection(connection) && hci_stack->le_data_packets_length > 0){ 443 max_acl_data_packet_length = hci_stack->le_data_packets_length; 444 } 445 446 // testing: reduce buffer to minimum 447 // max_acl_data_packet_length = 52; 448 449 int err; 450 // multiple packets could be send on a synchronous HCI transport 451 while (1){ 452 453 // get current data 454 const uint16_t acl_header_pos = hci_stack->acl_fragmentation_pos - 4; 455 int current_acl_data_packet_length = hci_stack->acl_fragmentation_total_size - hci_stack->acl_fragmentation_pos; 456 int more_fragments = 0; 457 458 // if ACL packet is larger than Bluetooth packet buffer, only send max_acl_data_packet_length 459 if (current_acl_data_packet_length > max_acl_data_packet_length){ 460 more_fragments = 1; 461 current_acl_data_packet_length = max_acl_data_packet_length; 462 } 463 464 // copy handle_and_flags if not first fragment and update packet boundary flags to be 01 (continuing fragmnent) 465 if (acl_header_pos > 0){ 466 uint16_t handle_and_flags = READ_BT_16(hci_stack->hci_packet_buffer, 0); 467 handle_and_flags = (handle_and_flags & 0xcfff) | (1 << 12); 468 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos, handle_and_flags); 469 } 470 471 // update header len 472 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos + 2, current_acl_data_packet_length); 473 474 // count packet 475 connection->num_acl_packets_sent++; 476 477 // send packet 478 uint8_t * packet = &hci_stack->hci_packet_buffer[acl_header_pos]; 479 const int size = current_acl_data_packet_length + 4; 480 hci_dump_packet(HCI_ACL_DATA_PACKET, 0, packet, size); 481 err = hci_stack->hci_transport->send_packet(HCI_ACL_DATA_PACKET, packet, size); 482 483 // done yet? 484 if (!more_fragments) break; 485 486 // update start of next fragment to send 487 hci_stack->acl_fragmentation_pos += current_acl_data_packet_length; 488 489 // can send more? 490 if (!hci_can_send_prepared_acl_packet_now(connection->con_handle)) return err; 491 } 492 493 // done 494 hci_stack->acl_fragmentation_pos = 0; 495 hci_stack->acl_fragmentation_total_size = 0; 496 497 // release buffer now for synchronous transport 498 if (hci_transport_synchronous()){ 499 hci_release_packet_buffer(); 500 } 501 502 return err; 503 } 504 505 // pre: caller has reserved the packet buffer 506 int hci_send_acl_packet_buffer(int size){ 507 508 // log_info("hci_send_acl_packet_buffer size %u", size); 509 510 if (!hci_stack->hci_packet_buffer_reserved) { 511 log_error("hci_send_acl_packet_buffer called without reserving packet buffer"); 512 return 0; 513 } 514 515 uint8_t * packet = hci_stack->hci_packet_buffer; 516 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 517 518 // check for free places on Bluetooth module 519 if (!hci_can_send_prepared_acl_packet_now(con_handle)) { 520 log_error("hci_send_acl_packet_buffer called but no free ACL buffers on controller"); 521 hci_release_packet_buffer(); 522 return BTSTACK_ACL_BUFFERS_FULL; 523 } 524 525 hci_connection_t *connection = hci_connection_for_handle( con_handle); 526 if (!connection) { 527 log_error("hci_send_acl_packet_buffer called but no connection for handle 0x%04x", con_handle); 528 hci_release_packet_buffer(); 529 return 0; 530 } 531 hci_connection_timestamp(connection); 532 533 // hci_dump_packet( HCI_ACL_DATA_PACKET, 0, packet, size); 534 535 // setup data 536 hci_stack->acl_fragmentation_total_size = size; 537 hci_stack->acl_fragmentation_pos = 4; // start of L2CAP packet 538 539 return hci_send_acl_packet_fragments(connection); 540 } 541 542 // pre: caller has reserved the packet buffer 543 int hci_send_sco_packet_buffer(int size){ 544 545 // log_info("hci_send_acl_packet_buffer size %u", size); 546 547 if (!hci_stack->hci_packet_buffer_reserved) { 548 log_error("hci_send_acl_packet_buffer called without reserving packet buffer"); 549 return 0; 550 } 551 552 uint8_t * packet = hci_stack->hci_packet_buffer; 553 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); // same for ACL and SCO 554 555 // check for free places on Bluetooth module 556 if (!hci_can_send_prepared_sco_packet_now(con_handle)) { 557 log_error("hci_send_sco_packet_buffer called but no free ACL buffers on controller"); 558 hci_release_packet_buffer(); 559 return BTSTACK_ACL_BUFFERS_FULL; 560 } 561 562 // track send packet in connection struct 563 hci_connection_t *connection = hci_connection_for_handle( con_handle); 564 if (!connection) { 565 log_error("hci_send_sco_packet_buffer called but no connection for handle 0x%04x", con_handle); 566 hci_release_packet_buffer(); 567 return 0; 568 } 569 connection->num_sco_packets_sent++; 570 571 hci_dump_packet( HCI_SCO_DATA_PACKET, 0, packet, size); 572 return hci_stack->hci_transport->send_packet(HCI_SCO_DATA_PACKET, packet, size); 573 } 574 575 static void acl_handler(uint8_t *packet, int size){ 576 577 // log_info("acl_handler: size %u", size); 578 579 // get info 580 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 581 hci_connection_t *conn = hci_connection_for_handle(con_handle); 582 uint8_t acl_flags = READ_ACL_FLAGS(packet); 583 uint16_t acl_length = READ_ACL_LENGTH(packet); 584 585 // ignore non-registered handle 586 if (!conn){ 587 log_error( "hci.c: acl_handler called with non-registered handle %u!" , con_handle); 588 return; 589 } 590 591 // assert packet is complete 592 if (acl_length + 4 != size){ 593 log_error("hci.c: acl_handler called with ACL packet of wrong size %u, expected %u => dropping packet", size, acl_length + 4); 594 return; 595 } 596 597 // update idle timestamp 598 hci_connection_timestamp(conn); 599 600 // handle different packet types 601 switch (acl_flags & 0x03) { 602 603 case 0x01: // continuation fragment 604 605 // sanity checks 606 if (conn->acl_recombination_pos == 0) { 607 log_error( "ACL Cont Fragment but no first fragment for handle 0x%02x", con_handle); 608 return; 609 } 610 if (conn->acl_recombination_pos + acl_length > 4 + HCI_ACL_BUFFER_SIZE){ 611 log_error( "ACL Cont Fragment to large: combined packet %u > buffer size %u for handle 0x%02x", 612 conn->acl_recombination_pos + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle); 613 conn->acl_recombination_pos = 0; 614 return; 615 } 616 617 // append fragment payload (header already stored) 618 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE + conn->acl_recombination_pos], &packet[4], acl_length ); 619 conn->acl_recombination_pos += acl_length; 620 621 // log_error( "ACL Cont Fragment: acl_len %u, combined_len %u, l2cap_len %u", acl_length, 622 // conn->acl_recombination_pos, conn->acl_recombination_length); 623 624 // forward complete L2CAP packet if complete. 625 if (conn->acl_recombination_pos >= conn->acl_recombination_length + 4 + 4){ // pos already incl. ACL header 626 627 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, &conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], conn->acl_recombination_pos); 628 // reset recombination buffer 629 conn->acl_recombination_length = 0; 630 conn->acl_recombination_pos = 0; 631 } 632 break; 633 634 case 0x02: { // first fragment 635 636 // sanity check 637 if (conn->acl_recombination_pos) { 638 log_error( "ACL First Fragment but data in buffer for handle 0x%02x, dropping stale fragments", con_handle); 639 conn->acl_recombination_pos = 0; 640 } 641 642 // peek into L2CAP packet! 643 uint16_t l2cap_length = READ_L2CAP_LENGTH( packet ); 644 645 // log_info( "ACL First Fragment: acl_len %u, l2cap_len %u", acl_length, l2cap_length); 646 647 // compare fragment size to L2CAP packet size 648 if (acl_length >= l2cap_length + 4){ 649 650 // forward fragment as L2CAP packet 651 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, packet, acl_length + 4); 652 653 } else { 654 655 if (acl_length > HCI_ACL_BUFFER_SIZE){ 656 log_error( "ACL First Fragment to large: fragment %u > buffer size %u for handle 0x%02x", 657 4 + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle); 658 return; 659 } 660 661 // store first fragment and tweak acl length for complete package 662 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], packet, acl_length + 4); 663 conn->acl_recombination_pos = acl_length + 4; 664 conn->acl_recombination_length = l2cap_length; 665 bt_store_16(conn->acl_recombination_buffer, HCI_INCOMING_PRE_BUFFER_SIZE + 2, l2cap_length +4); 666 } 667 break; 668 669 } 670 default: 671 log_error( "hci.c: acl_handler called with invalid packet boundary flags %u", acl_flags & 0x03); 672 return; 673 } 674 675 // execute main loop 676 hci_run(); 677 } 678 679 static void hci_shutdown_connection(hci_connection_t *conn){ 680 log_info("Connection closed: handle 0x%x, %s", conn->con_handle, bd_addr_to_str(conn->address)); 681 682 run_loop_remove_timer(&conn->timeout); 683 684 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 685 btstack_memory_hci_connection_free( conn ); 686 687 // now it's gone 688 hci_emit_nr_connections_changed(); 689 } 690 691 static const uint16_t packet_type_sizes[] = { 692 0, HCI_ACL_2DH1_SIZE, HCI_ACL_3DH1_SIZE, HCI_ACL_DM1_SIZE, 693 HCI_ACL_DH1_SIZE, 0, 0, 0, 694 HCI_ACL_2DH3_SIZE, HCI_ACL_3DH3_SIZE, HCI_ACL_DM3_SIZE, HCI_ACL_DH3_SIZE, 695 HCI_ACL_2DH5_SIZE, HCI_ACL_3DH5_SIZE, HCI_ACL_DM5_SIZE, HCI_ACL_DH5_SIZE 696 }; 697 static const uint8_t packet_type_feature_requirement_bit[] = { 698 0, // 3 slot packets 699 1, // 5 slot packets 700 25, // EDR 2 mpbs 701 26, // EDR 3 mbps 702 39, // 3 slot EDR packts 703 40, // 5 slot EDR packet 704 }; 705 static const uint16_t packet_type_feature_packet_mask[] = { 706 0x0f00, // 3 slot packets 707 0xf000, // 5 slot packets 708 0x1102, // EDR 2 mpbs 709 0x2204, // EDR 3 mbps 710 0x0300, // 3 slot EDR packts 711 0x3000, // 5 slot EDR packet 712 }; 713 714 static uint16_t hci_acl_packet_types_for_buffer_size_and_local_features(uint16_t buffer_size, uint8_t * local_supported_features){ 715 // enable packet types based on size 716 uint16_t packet_types = 0; 717 unsigned int i; 718 for (i=0;i<16;i++){ 719 if (packet_type_sizes[i] == 0) continue; 720 if (packet_type_sizes[i] <= buffer_size){ 721 packet_types |= 1 << i; 722 } 723 } 724 // disable packet types due to missing local supported features 725 for (i=0;i<sizeof(packet_type_feature_requirement_bit);i++){ 726 int bit_idx = packet_type_feature_requirement_bit[i]; 727 int feature_set = (local_supported_features[bit_idx >> 3] & (1<<(bit_idx & 7))) != 0; 728 if (feature_set) continue; 729 log_info("Features bit %02u is not set, removing packet types 0x%04x", bit_idx, packet_type_feature_packet_mask[i]); 730 packet_types &= ~packet_type_feature_packet_mask[i]; 731 } 732 // flip bits for "may not be used" 733 packet_types ^= 0x3306; 734 return packet_types; 735 } 736 737 uint16_t hci_usable_acl_packet_types(void){ 738 return hci_stack->packet_types; 739 } 740 741 uint8_t* hci_get_outgoing_packet_buffer(void){ 742 // hci packet buffer is >= acl data packet length 743 return hci_stack->hci_packet_buffer; 744 } 745 746 uint16_t hci_max_acl_data_packet_length(void){ 747 return hci_stack->acl_data_packet_length; 748 } 749 750 int hci_non_flushable_packet_boundary_flag_supported(void){ 751 // No. 54, byte 6, bit 6 752 return (hci_stack->local_supported_features[6] & (1 << 6)) != 0; 753 } 754 755 int hci_ssp_supported(void){ 756 // No. 51, byte 6, bit 3 757 return (hci_stack->local_supported_features[6] & (1 << 3)) != 0; 758 } 759 760 int hci_classic_supported(void){ 761 // No. 37, byte 4, bit 5, = No BR/EDR Support 762 return (hci_stack->local_supported_features[4] & (1 << 5)) == 0; 763 } 764 765 int hci_le_supported(void){ 766 #ifdef HAVE_BLE 767 // No. 37, byte 4, bit 6 = LE Supported (Controller) 768 return (hci_stack->local_supported_features[4] & (1 << 6)) != 0; 769 #else 770 return 0; 771 #endif 772 } 773 774 // get addr type and address used in advertisement packets 775 void hci_le_advertisement_address(uint8_t * addr_type, bd_addr_t addr){ 776 *addr_type = hci_stack->adv_addr_type; 777 if (hci_stack->adv_addr_type){ 778 memcpy(addr, hci_stack->adv_address, 6); 779 } else { 780 memcpy(addr, hci_stack->local_bd_addr, 6); 781 } 782 } 783 784 #ifdef HAVE_BLE 785 void le_handle_advertisement_report(uint8_t *packet, int size){ 786 int offset = 3; 787 int num_reports = packet[offset]; 788 offset += 1; 789 790 int i; 791 log_info("HCI: handle adv report with num reports: %d", num_reports); 792 uint8_t event[12 + LE_ADVERTISING_DATA_SIZE]; // use upper bound to avoid var size automatic var 793 for (i=0; i<num_reports;i++){ 794 uint8_t data_length = packet[offset + 8]; 795 uint8_t event_size = 10 + data_length; 796 int pos = 0; 797 event[pos++] = GAP_LE_ADVERTISING_REPORT; 798 event[pos++] = event_size; 799 memcpy(&event[pos], &packet[offset], 1+1+6); // event type + address type + address 800 offset += 8; 801 pos += 8; 802 event[pos++] = packet[offset + 1 + data_length]; // rssi 803 event[pos++] = packet[offset++]; //data_length; 804 memcpy(&event[pos], &packet[offset], data_length); 805 pos += data_length; 806 offset += data_length + 1; // rssi 807 hci_dump_packet( HCI_EVENT_PACKET, 0, event, pos); 808 hci_stack->packet_handler(HCI_EVENT_PACKET, event, pos); 809 } 810 } 811 #endif 812 813 static void hci_initializing_event_handler(uint8_t * packet, uint16_t size){ 814 uint8_t command_completed = 0; 815 if ((hci_stack->substate % 2) == 0) return; 816 // odd: waiting for event 817 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 818 uint16_t opcode = READ_BT_16(packet,3); 819 if (opcode == hci_stack->last_cmd_opcode){ 820 command_completed = 1; 821 log_info("Command complete for expected opcode %04x -> new substate %u", opcode, hci_stack->substate >> 1); 822 } else { 823 log_info("Command complete for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 824 } 825 } 826 if (packet[0] == HCI_EVENT_COMMAND_STATUS){ 827 uint8_t status = packet[2]; 828 uint16_t opcode = READ_BT_16(packet,4); 829 if (opcode == hci_stack->last_cmd_opcode){ 830 if (status){ 831 command_completed = 1; 832 log_error("Command status error 0x%02x for expected opcode %04x -> new substate %u", status, opcode, hci_stack->substate >> 1); 833 } else { 834 log_info("Command status OK for expected opcode %04x, waiting for command complete", opcode); 835 } 836 } else { 837 log_info("Command status for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 838 } 839 } 840 841 if (!command_completed) return; 842 843 switch(hci_stack->substate >> 1){ 844 default: 845 hci_stack->substate++; 846 break; 847 } 848 } 849 850 static void hci_initializing_state_machine(){ 851 if (hci_stack->substate % 2) { 852 // odd: waiting for command completion 853 return; 854 } 855 // log_info("hci_init: substate %u", hci_stack->substate >> 1); 856 switch (hci_stack->substate >> 1){ 857 case 0: // RESET 858 hci_state_reset(); 859 860 hci_send_cmd(&hci_reset); 861 if (hci_stack->config == NULL || ((hci_uart_config_t *)hci_stack->config)->baudrate_main == 0){ 862 // skip baud change 863 hci_stack->substate = 2 << 1; 864 } 865 break; 866 case 1: // SEND BAUD CHANGE 867 hci_stack->control->baudrate_cmd(hci_stack->config, ((hci_uart_config_t *)hci_stack->config)->baudrate_main, hci_stack->hci_packet_buffer); 868 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 869 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 870 break; 871 case 2: // LOCAL BAUD CHANGE 872 log_info("Local baud rate change"); 873 hci_stack->hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack->config)->baudrate_main); 874 hci_stack->substate += 2; 875 // break missing here for fall through 876 877 case 3: // SET BD ADDR 878 if ( hci_stack->custom_bd_addr_set && hci_stack->control && hci_stack->control->set_bd_addr_cmd){ 879 log_info("Set Public BD ADDR to %s", bd_addr_to_str(hci_stack->custom_bd_addr)); 880 hci_stack->control->set_bd_addr_cmd(hci_stack->config, hci_stack->custom_bd_addr, hci_stack->hci_packet_buffer); 881 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 882 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 883 break; 884 } 885 hci_stack->substate += 2; 886 // break missing here for fall through 887 888 case 4: 889 log_info("Custom init"); 890 // Custom initialization 891 if (hci_stack->control && hci_stack->control->next_cmd){ 892 int valid_cmd = (*hci_stack->control->next_cmd)(hci_stack->config, hci_stack->hci_packet_buffer); 893 if (valid_cmd){ 894 int size = 3 + hci_stack->hci_packet_buffer[2]; 895 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 896 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, hci_stack->hci_packet_buffer, size); 897 hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack->hci_packet_buffer, size); 898 hci_stack->substate = 3 << 1; // more init commands 899 break; 900 } 901 log_info("hci_run: init script done"); 902 } 903 // otherwise continue 904 hci_send_cmd(&hci_read_bd_addr); 905 break; 906 case 5: 907 hci_send_cmd(&hci_read_buffer_size); 908 break; 909 case 6: 910 hci_send_cmd(&hci_read_local_supported_features); 911 break; 912 case 7: 913 if (hci_le_supported()){ 914 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 915 } else { 916 // Kensington Bluetooth 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 917 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 918 } 919 920 // skip Classic init commands for LE only chipsets 921 if (!hci_classic_supported()){ 922 if (hci_le_supported()){ 923 hci_stack->substate = 12 << 1; // skip all classic command 924 } else { 925 log_error("Neither BR/EDR nor LE supported"); 926 hci_stack->substate = 15 << 1; // skip all 927 } 928 } 929 break; 930 case 8: 931 if (hci_ssp_supported()){ 932 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack->ssp_enable); 933 break; 934 } 935 hci_stack->substate += 2; 936 // break missing here for fall through 937 938 case 9: 939 // ca. 15 sec 940 hci_send_cmd(&hci_write_page_timeout, 0x6000); 941 break; 942 case 10: 943 hci_send_cmd(&hci_write_class_of_device, hci_stack->class_of_device); 944 break; 945 case 11: 946 if (hci_stack->local_name){ 947 hci_send_cmd(&hci_write_local_name, hci_stack->local_name); 948 } else { 949 char hostname[30]; 950 #ifdef EMBEDDED 951 // BTstack-11:22:33:44:55:66 952 strcpy(hostname, "BTstack "); 953 strcat(hostname, bd_addr_to_str(hci_stack->local_bd_addr)); 954 log_info("---> Name %s", hostname); 955 #else 956 // hostname for POSIX systems 957 gethostname(hostname, 30); 958 hostname[29] = '\0'; 959 #endif 960 hci_send_cmd(&hci_write_local_name, hostname); 961 } 962 break; 963 case 12: 964 hci_send_cmd(&hci_write_scan_enable, (hci_stack->connectable << 1) | hci_stack->discoverable); // page scan 965 if (!hci_le_supported()){ 966 // SKIP LE init for Classic only configuration 967 hci_stack->substate = 15 << 1; 968 } 969 break; 970 971 #ifdef HAVE_BLE 972 // LE INIT 973 case 13: 974 hci_send_cmd(&hci_le_read_buffer_size); 975 break; 976 case 14: 977 // LE Supported Host = 1, Simultaneous Host = 0 978 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 979 break; 980 case 15: 981 // LE Scan Parameters: active scanning, 300 ms interval, 30 ms window, public address, accept all advs 982 hci_send_cmd(&hci_le_set_scan_parameters, 1, 0x1e0, 0x30, 0, 0); 983 break; 984 #endif 985 986 // DONE 987 case 16: 988 // done. 989 hci_stack->state = HCI_STATE_WORKING; 990 hci_emit_state(); 991 break; 992 default: 993 break; 994 } 995 hci_stack->substate++; 996 } 997 998 // avoid huge local variables 999 #ifndef EMBEDDED 1000 static device_name_t device_name; 1001 #endif 1002 static void event_handler(uint8_t *packet, int size){ 1003 1004 uint16_t event_length = packet[1]; 1005 1006 // assert packet is complete 1007 if (size != event_length + 2){ 1008 log_error("hci.c: event_handler called with event packet of wrong size %u, expected %u => dropping packet", size, event_length + 2); 1009 return; 1010 } 1011 1012 bd_addr_t addr; 1013 bd_addr_type_t addr_type; 1014 uint8_t link_type; 1015 hci_con_handle_t handle; 1016 hci_connection_t * conn; 1017 int i; 1018 1019 // log_info("HCI:EVENT:%02x", packet[0]); 1020 1021 switch (packet[0]) { 1022 1023 case HCI_EVENT_COMMAND_COMPLETE: 1024 // get num cmd packets 1025 // log_info("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u", hci_stack->num_cmd_packets, packet[2]); 1026 hci_stack->num_cmd_packets = packet[2]; 1027 1028 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 1029 // from offset 5 1030 // status 1031 // "The HC_ACL_Data_Packet_Length return parameter will be used to determine the size of the L2CAP segments contained in ACL Data Packets" 1032 hci_stack->acl_data_packet_length = READ_BT_16(packet, 6); 1033 hci_stack->sco_data_packet_length = packet[8]; 1034 hci_stack->acl_packets_total_num = READ_BT_16(packet, 9); 1035 hci_stack->sco_packets_total_num = READ_BT_16(packet, 11); 1036 1037 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1038 // determine usable ACL payload size 1039 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->acl_data_packet_length){ 1040 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1041 } 1042 log_info("hci_read_buffer_size: acl used size %u, count %u / sco size %u, count %u", 1043 hci_stack->acl_data_packet_length, hci_stack->acl_packets_total_num, 1044 hci_stack->sco_data_packet_length, hci_stack->sco_packets_total_num); 1045 } 1046 } 1047 #ifdef HAVE_BLE 1048 if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_buffer_size)){ 1049 hci_stack->le_data_packets_length = READ_BT_16(packet, 6); 1050 hci_stack->le_acl_packets_total_num = packet[8]; 1051 // determine usable ACL payload size 1052 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->le_data_packets_length){ 1053 hci_stack->le_data_packets_length = HCI_ACL_PAYLOAD_SIZE; 1054 } 1055 log_info("hci_le_read_buffer_size: size %u, count %u", hci_stack->le_data_packets_length, hci_stack->le_acl_packets_total_num); 1056 } 1057 #endif 1058 // Dump local address 1059 if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)) { 1060 bt_flip_addr(hci_stack->local_bd_addr, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1]); 1061 log_info("Local Address, Status: 0x%02x: Addr: %s", 1062 packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE], bd_addr_to_str(hci_stack->local_bd_addr)); 1063 } 1064 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1065 hci_emit_discoverable_enabled(hci_stack->discoverable); 1066 } 1067 // Note: HCI init checks 1068 if (COMMAND_COMPLETE_EVENT(packet, hci_read_local_supported_features)){ 1069 memcpy(hci_stack->local_supported_features, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1], 8); 1070 log_info("Local Supported Features: 0x%02x%02x%02x%02x%02x%02x%02x%02x", 1071 hci_stack->local_supported_features[0], hci_stack->local_supported_features[1], 1072 hci_stack->local_supported_features[2], hci_stack->local_supported_features[3], 1073 hci_stack->local_supported_features[4], hci_stack->local_supported_features[5], 1074 hci_stack->local_supported_features[6], hci_stack->local_supported_features[7]); 1075 1076 // determine usable ACL packet types based on host buffer size and supported features 1077 hci_stack->packet_types = hci_acl_packet_types_for_buffer_size_and_local_features(HCI_ACL_PAYLOAD_SIZE, &hci_stack->local_supported_features[0]); 1078 log_info("packet types %04x", hci_stack->packet_types); 1079 1080 // Classic/LE 1081 log_info("BR/EDR support %u, LE support %u", hci_classic_supported(), hci_le_supported()); 1082 } 1083 break; 1084 1085 case HCI_EVENT_COMMAND_STATUS: 1086 // get num cmd packets 1087 // log_info("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u", hci_stack->num_cmd_packets, packet[3]); 1088 hci_stack->num_cmd_packets = packet[3]; 1089 break; 1090 1091 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:{ 1092 int offset = 3; 1093 for (i=0; i<packet[2];i++){ 1094 handle = READ_BT_16(packet, offset); 1095 offset += 2; 1096 uint16_t num_packets = READ_BT_16(packet, offset); 1097 offset += 2; 1098 1099 conn = hci_connection_for_handle(handle); 1100 if (!conn){ 1101 log_error("hci_number_completed_packet lists unused con handle %u", handle); 1102 continue; 1103 } 1104 1105 if (conn->address_type == BD_ADDR_TYPE_SCO){ 1106 if (conn->num_sco_packets_sent >= num_packets){ 1107 conn->num_sco_packets_sent -= num_packets; 1108 } else { 1109 log_error("hci_number_completed_packets, more sco slots freed then sent."); 1110 conn->num_sco_packets_sent = 0; 1111 } 1112 1113 } else { 1114 if (conn->num_acl_packets_sent >= num_packets){ 1115 conn->num_acl_packets_sent -= num_packets; 1116 } else { 1117 log_error("hci_number_completed_packets, more acl slots freed then sent."); 1118 conn->num_acl_packets_sent = 0; 1119 } 1120 } 1121 // log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u", num_packets, handle, conn->num_acl_packets_sent); 1122 } 1123 break; 1124 } 1125 case HCI_EVENT_CONNECTION_REQUEST: 1126 bt_flip_addr(addr, &packet[2]); 1127 // TODO: eval COD 8-10 1128 link_type = packet[11]; 1129 log_info("Connection_incoming: %s, type %u", bd_addr_to_str(addr), link_type); 1130 addr_type = link_type == 1 ? BD_ADDR_TYPE_CLASSIC : BD_ADDR_TYPE_SCO; 1131 conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 1132 if (!conn) { 1133 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 1134 } 1135 if (!conn) { 1136 // CONNECTION REJECTED DUE TO LIMITED RESOURCES (0X0D) 1137 hci_stack->decline_reason = 0x0d; 1138 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1139 break; 1140 } 1141 conn->state = RECEIVED_CONNECTION_REQUEST; 1142 hci_run(); 1143 break; 1144 1145 case HCI_EVENT_CONNECTION_COMPLETE: 1146 // Connection management 1147 bt_flip_addr(addr, &packet[5]); 1148 log_info("Connection_complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 1149 addr_type = BD_ADDR_TYPE_CLASSIC; 1150 conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 1151 if (conn) { 1152 if (!packet[2]){ 1153 conn->state = OPEN; 1154 conn->con_handle = READ_BT_16(packet, 3); 1155 conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES; 1156 1157 // restart timer 1158 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1159 run_loop_add_timer(&conn->timeout); 1160 1161 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1162 1163 hci_emit_nr_connections_changed(); 1164 } else { 1165 int notify_dedicated_bonding_failed = conn->bonding_flags & BONDING_DEDICATED; 1166 uint8_t status = packet[2]; 1167 bd_addr_t bd_address; 1168 memcpy(&bd_address, conn->address, 6); 1169 1170 // connection failed, remove entry 1171 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1172 btstack_memory_hci_connection_free( conn ); 1173 1174 // notify client if dedicated bonding 1175 if (notify_dedicated_bonding_failed){ 1176 log_info("hci notify_dedicated_bonding_failed"); 1177 hci_emit_dedicated_bonding_result(bd_address, status); 1178 } 1179 1180 // if authentication error, also delete link key 1181 if (packet[2] == 0x05) { 1182 hci_drop_link_key_for_bd_addr(addr); 1183 } 1184 } 1185 } 1186 break; 1187 1188 case HCI_EVENT_SYNCHRONOUS_CONNECTION_COMPLETE: 1189 bt_flip_addr(addr, &packet[5]); 1190 log_info("Synchronous Connection Complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 1191 if (packet[2]){ 1192 // connection failed 1193 break; 1194 } 1195 conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_SCO); 1196 if (!conn) { 1197 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_SCO); 1198 } 1199 if (!conn) { 1200 break; 1201 } 1202 conn->state = OPEN; 1203 conn->con_handle = READ_BT_16(packet, 3); 1204 break; 1205 1206 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 1207 handle = READ_BT_16(packet, 3); 1208 conn = hci_connection_for_handle(handle); 1209 if (!conn) break; 1210 if (!packet[2]){ 1211 uint8_t * features = &packet[5]; 1212 if (features[6] & (1 << 3)){ 1213 conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP; 1214 } 1215 } 1216 conn->bonding_flags |= BONDING_RECEIVED_REMOTE_FEATURES; 1217 log_info("HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE, bonding flags %x", conn->bonding_flags); 1218 if (conn->bonding_flags & BONDING_DEDICATED){ 1219 conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 1220 } 1221 break; 1222 1223 case HCI_EVENT_LINK_KEY_REQUEST: 1224 log_info("HCI_EVENT_LINK_KEY_REQUEST"); 1225 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 1226 // non-bondable mode: link key negative reply will be sent by HANDLE_LINK_KEY_REQUEST 1227 if (hci_stack->bondable && !hci_stack->remote_device_db) break; 1228 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], HANDLE_LINK_KEY_REQUEST); 1229 hci_run(); 1230 // request handled by hci_run() as HANDLE_LINK_KEY_REQUEST gets set 1231 return; 1232 1233 case HCI_EVENT_LINK_KEY_NOTIFICATION: { 1234 bt_flip_addr(addr, &packet[2]); 1235 conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 1236 if (!conn) break; 1237 conn->authentication_flags |= RECV_LINK_KEY_NOTIFICATION; 1238 link_key_type_t link_key_type = (link_key_type_t)packet[24]; 1239 // Change Connection Encryption keeps link key type 1240 if (link_key_type != CHANGED_COMBINATION_KEY){ 1241 conn->link_key_type = link_key_type; 1242 } 1243 if (!hci_stack->remote_device_db) break; 1244 hci_stack->remote_device_db->put_link_key(addr, &packet[8], conn->link_key_type); 1245 // still forward event to allow dismiss of pairing dialog 1246 break; 1247 } 1248 1249 case HCI_EVENT_PIN_CODE_REQUEST: 1250 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], LEGACY_PAIRING_ACTIVE); 1251 // non-bondable mode: pin code negative reply will be sent 1252 if (!hci_stack->bondable){ 1253 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], DENY_PIN_CODE_REQUEST); 1254 hci_run(); 1255 return; 1256 } 1257 // PIN CODE REQUEST means the link key request didn't succee -> delete stored link key 1258 if (!hci_stack->remote_device_db) break; 1259 bt_flip_addr(addr, &packet[2]); 1260 hci_stack->remote_device_db->delete_link_key(addr); 1261 break; 1262 1263 case HCI_EVENT_IO_CAPABILITY_REQUEST: 1264 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_IO_CAPABILITIES_REQUEST); 1265 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_IO_CAPABILITIES_REPLY); 1266 break; 1267 1268 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 1269 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1270 if (!hci_stack->ssp_auto_accept) break; 1271 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_CONFIRM_REPLY); 1272 break; 1273 1274 case HCI_EVENT_USER_PASSKEY_REQUEST: 1275 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1276 if (!hci_stack->ssp_auto_accept) break; 1277 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_PASSKEY_REPLY); 1278 break; 1279 1280 case HCI_EVENT_ENCRYPTION_CHANGE: 1281 handle = READ_BT_16(packet, 3); 1282 conn = hci_connection_for_handle(handle); 1283 if (!conn) break; 1284 if (packet[2] == 0) { 1285 if (packet[5]){ 1286 conn->authentication_flags |= CONNECTION_ENCRYPTED; 1287 } else { 1288 conn->authentication_flags &= ~CONNECTION_ENCRYPTED; 1289 } 1290 } 1291 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1292 break; 1293 1294 case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT: 1295 handle = READ_BT_16(packet, 3); 1296 conn = hci_connection_for_handle(handle); 1297 if (!conn) break; 1298 1299 // dedicated bonding: send result and disconnect 1300 if (conn->bonding_flags & BONDING_DEDICATED){ 1301 conn->bonding_flags &= ~BONDING_DEDICATED; 1302 conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE; 1303 conn->bonding_status = packet[2]; 1304 break; 1305 } 1306 1307 if (packet[2] == 0 && gap_security_level_for_link_key_type(conn->link_key_type) >= conn->requested_security_level){ 1308 // link key sufficient for requested security 1309 conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 1310 break; 1311 } 1312 // not enough 1313 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1314 break; 1315 1316 #ifndef EMBEDDED 1317 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 1318 if (!hci_stack->remote_device_db) break; 1319 if (packet[2]) break; // status not ok 1320 bt_flip_addr(addr, &packet[3]); 1321 // fix for invalid remote names - terminate on 0xff 1322 for (i=0; i<248;i++){ 1323 if (packet[9+i] == 0xff){ 1324 packet[9+i] = 0; 1325 break; 1326 } 1327 } 1328 memset(&device_name, 0, sizeof(device_name_t)); 1329 strncpy((char*) device_name, (char*) &packet[9], 248); 1330 hci_stack->remote_device_db->put_name(addr, &device_name); 1331 break; 1332 1333 case HCI_EVENT_INQUIRY_RESULT: 1334 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:{ 1335 if (!hci_stack->remote_device_db) break; 1336 // first send inq result packet 1337 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1338 // then send cached remote names 1339 int offset = 3; 1340 for (i=0; i<packet[2];i++){ 1341 bt_flip_addr(addr, &packet[offset]); 1342 offset += 14; // 6 + 1 + 1 + 1 + 3 + 2; 1343 if (hci_stack->remote_device_db->get_name(addr, &device_name)){ 1344 hci_emit_remote_name_cached(addr, &device_name); 1345 } 1346 } 1347 return; 1348 } 1349 #endif 1350 1351 // HCI_EVENT_DISCONNECTION_COMPLETE 1352 // has been split, to first notify stack before shutting connection down 1353 // see end of function, too. 1354 case HCI_EVENT_DISCONNECTION_COMPLETE: 1355 if (packet[2]) break; // status != 0 1356 handle = READ_BT_16(packet, 3); 1357 hci_connection_t * conn = hci_connection_for_handle(handle); 1358 if (!conn) break; // no conn struct anymore 1359 conn->state = RECEIVED_DISCONNECTION_COMPLETE; 1360 break; 1361 1362 case HCI_EVENT_HARDWARE_ERROR: 1363 if(hci_stack->control && hci_stack->control->hw_error){ 1364 (*hci_stack->control->hw_error)(); 1365 } else { 1366 // if no special requests, just reboot stack 1367 hci_power_control_off(); 1368 hci_power_control_on(); 1369 } 1370 break; 1371 1372 case DAEMON_EVENT_HCI_PACKET_SENT: 1373 // release packet buffer only for asynchronous transport and if there are not further fragements 1374 if (hci_transport_synchronous()) { 1375 log_error("Synchronous HCI Transport shouldn't send DAEMON_EVENT_HCI_PACKET_SENT"); 1376 return; // instead of break: to avoid re-entering hci_run() 1377 } 1378 if (hci_stack->acl_fragmentation_total_size) break; 1379 hci_release_packet_buffer(); 1380 break; 1381 1382 #ifdef HAVE_BLE 1383 case HCI_EVENT_LE_META: 1384 switch (packet[2]){ 1385 case HCI_SUBEVENT_LE_ADVERTISING_REPORT: 1386 log_info("advertising report received"); 1387 if (hci_stack->le_scanning_state != LE_SCANNING) break; 1388 le_handle_advertisement_report(packet, size); 1389 break; 1390 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 1391 // Connection management 1392 bt_flip_addr(addr, &packet[8]); 1393 addr_type = (bd_addr_type_t)packet[7]; 1394 log_info("LE Connection_complete (status=%u) type %u, %s", packet[3], addr_type, bd_addr_to_str(addr)); 1395 // LE connections are auto-accepted, so just create a connection if there isn't one already 1396 conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 1397 if (packet[3]){ 1398 if (conn){ 1399 // outgoing connection failed, remove entry 1400 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1401 btstack_memory_hci_connection_free( conn ); 1402 } 1403 // if authentication error, also delete link key 1404 if (packet[3] == 0x05) { 1405 hci_drop_link_key_for_bd_addr(addr); 1406 } 1407 break; 1408 } 1409 if (!conn){ 1410 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 1411 } 1412 if (!conn){ 1413 // no memory 1414 break; 1415 } 1416 1417 conn->state = OPEN; 1418 conn->con_handle = READ_BT_16(packet, 4); 1419 1420 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 1421 1422 // restart timer 1423 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1424 // run_loop_add_timer(&conn->timeout); 1425 1426 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1427 1428 hci_emit_nr_connections_changed(); 1429 break; 1430 1431 // log_info("LE buffer size: %u, count %u", READ_BT_16(packet,6), packet[8]); 1432 1433 default: 1434 break; 1435 } 1436 break; 1437 #endif 1438 default: 1439 break; 1440 } 1441 1442 // handle BT initialization 1443 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1444 hci_initializing_event_handler(packet, size); 1445 } 1446 1447 // help with BT sleep 1448 if (hci_stack->state == HCI_STATE_FALLING_ASLEEP 1449 && hci_stack->substate == 1 1450 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1451 hci_stack->substate++; 1452 } 1453 1454 // notify upper stack 1455 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1456 1457 // moved here to give upper stack a chance to close down everything with hci_connection_t intact 1458 if (packet[0] == HCI_EVENT_DISCONNECTION_COMPLETE){ 1459 if (!packet[2]){ 1460 handle = READ_BT_16(packet, 3); 1461 hci_connection_t * conn = hci_connection_for_handle(handle); 1462 if (conn) { 1463 uint8_t status = conn->bonding_status; 1464 uint16_t flags = conn->bonding_flags; 1465 bd_addr_t bd_address; 1466 memcpy(&bd_address, conn->address, 6); 1467 hci_shutdown_connection(conn); 1468 // connection struct is gone, don't access anymore 1469 if (flags & BONDING_EMIT_COMPLETE_ON_DISCONNECT){ 1470 hci_emit_dedicated_bonding_result(bd_address, status); 1471 } 1472 } 1473 } 1474 } 1475 1476 // execute main loop 1477 hci_run(); 1478 } 1479 1480 static void sco_handler(uint8_t * packet, uint16_t size){ 1481 // not handled yet 1482 } 1483 1484 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1485 hci_dump_packet(packet_type, 1, packet, size); 1486 switch (packet_type) { 1487 case HCI_EVENT_PACKET: 1488 event_handler(packet, size); 1489 break; 1490 case HCI_ACL_DATA_PACKET: 1491 acl_handler(packet, size); 1492 break; 1493 case HCI_SCO_DATA_PACKET: 1494 sco_handler(packet, size); 1495 default: 1496 break; 1497 } 1498 } 1499 1500 /** Register HCI packet handlers */ 1501 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 1502 hci_stack->packet_handler = handler; 1503 } 1504 1505 static void hci_state_reset(){ 1506 // no connections yet 1507 hci_stack->connections = NULL; 1508 1509 // keep discoverable/connectable as this has been requested by the client(s) 1510 // hci_stack->discoverable = 0; 1511 // hci_stack->connectable = 0; 1512 // hci_stack->bondable = 1; 1513 1514 // buffer is free 1515 hci_stack->hci_packet_buffer_reserved = 0; 1516 1517 // no pending cmds 1518 hci_stack->decline_reason = 0; 1519 hci_stack->new_scan_enable_value = 0xff; 1520 1521 // LE 1522 hci_stack->adv_addr_type = 0; 1523 memset(hci_stack->adv_address, 0, 6); 1524 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1525 hci_stack->le_scan_type = 0xff; 1526 hci_stack->le_connection_parameter_range.le_conn_interval_min = 0x0006; 1527 hci_stack->le_connection_parameter_range.le_conn_interval_max = 0x0C80; 1528 hci_stack->le_connection_parameter_range.le_conn_latency_min = 0x0000; 1529 hci_stack->le_connection_parameter_range.le_conn_latency_max = 0x03E8; 1530 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = 0x000A; 1531 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = 0x0C80; 1532 } 1533 1534 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 1535 1536 #ifdef HAVE_MALLOC 1537 if (!hci_stack) { 1538 hci_stack = (hci_stack_t*) malloc(sizeof(hci_stack_t)); 1539 } 1540 #else 1541 hci_stack = &hci_stack_static; 1542 #endif 1543 memset(hci_stack, 0, sizeof(hci_stack_t)); 1544 1545 // reference to use transport layer implementation 1546 hci_stack->hci_transport = transport; 1547 1548 // references to used control implementation 1549 hci_stack->control = control; 1550 1551 // reference to used config 1552 hci_stack->config = config; 1553 1554 // higher level handler 1555 hci_stack->packet_handler = dummy_handler; 1556 1557 // store and open remote device db 1558 hci_stack->remote_device_db = remote_device_db; 1559 if (hci_stack->remote_device_db) { 1560 hci_stack->remote_device_db->open(); 1561 } 1562 1563 // max acl payload size defined in config.h 1564 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1565 1566 // register packet handlers with transport 1567 transport->register_packet_handler(&packet_handler); 1568 1569 hci_stack->state = HCI_STATE_OFF; 1570 1571 // class of device 1572 hci_stack->class_of_device = 0x007a020c; // Smartphone 1573 1574 // bondable by default 1575 hci_stack->bondable = 1; 1576 1577 // Secure Simple Pairing default: enable, no I/O capabilities, general bonding, mitm not required, auto accept 1578 hci_stack->ssp_enable = 1; 1579 hci_stack->ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 1580 hci_stack->ssp_authentication_requirement = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING; 1581 hci_stack->ssp_auto_accept = 1; 1582 1583 hci_state_reset(); 1584 } 1585 1586 void hci_close(){ 1587 // close remote device db 1588 if (hci_stack->remote_device_db) { 1589 hci_stack->remote_device_db->close(); 1590 } 1591 while (hci_stack->connections) { 1592 // cancel all l2cap connections 1593 hci_emit_disconnection_complete(((hci_connection_t *) hci_stack->connections)->con_handle, 0x16); // terminated by local host 1594 hci_shutdown_connection((hci_connection_t *) hci_stack->connections); 1595 } 1596 hci_power_control(HCI_POWER_OFF); 1597 1598 #ifdef HAVE_MALLOC 1599 free(hci_stack); 1600 #endif 1601 hci_stack = NULL; 1602 } 1603 1604 void hci_set_class_of_device(uint32_t class_of_device){ 1605 hci_stack->class_of_device = class_of_device; 1606 } 1607 1608 // Set Public BD ADDR - passed on to Bluetooth chipset if supported in bt_control_h 1609 void hci_set_bd_addr(bd_addr_t addr){ 1610 memcpy(hci_stack->custom_bd_addr, addr, 6); 1611 hci_stack->custom_bd_addr_set = 1; 1612 } 1613 1614 void hci_disable_l2cap_timeout_check(){ 1615 disable_l2cap_timeouts = 1; 1616 } 1617 // State-Module-Driver overview 1618 // state module low-level 1619 // HCI_STATE_OFF off close 1620 // HCI_STATE_INITIALIZING, on open 1621 // HCI_STATE_WORKING, on open 1622 // HCI_STATE_HALTING, on open 1623 // HCI_STATE_SLEEPING, off/sleep close 1624 // HCI_STATE_FALLING_ASLEEP on open 1625 1626 static int hci_power_control_on(void){ 1627 1628 // power on 1629 int err = 0; 1630 if (hci_stack->control && hci_stack->control->on){ 1631 err = (*hci_stack->control->on)(hci_stack->config); 1632 } 1633 if (err){ 1634 log_error( "POWER_ON failed"); 1635 hci_emit_hci_open_failed(); 1636 return err; 1637 } 1638 1639 // open low-level device 1640 err = hci_stack->hci_transport->open(hci_stack->config); 1641 if (err){ 1642 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1643 if (hci_stack->control && hci_stack->control->off){ 1644 (*hci_stack->control->off)(hci_stack->config); 1645 } 1646 hci_emit_hci_open_failed(); 1647 return err; 1648 } 1649 return 0; 1650 } 1651 1652 static void hci_power_control_off(void){ 1653 1654 log_info("hci_power_control_off"); 1655 1656 // close low-level device 1657 hci_stack->hci_transport->close(hci_stack->config); 1658 1659 log_info("hci_power_control_off - hci_transport closed"); 1660 1661 // power off 1662 if (hci_stack->control && hci_stack->control->off){ 1663 (*hci_stack->control->off)(hci_stack->config); 1664 } 1665 1666 log_info("hci_power_control_off - control closed"); 1667 1668 hci_stack->state = HCI_STATE_OFF; 1669 } 1670 1671 static void hci_power_control_sleep(void){ 1672 1673 log_info("hci_power_control_sleep"); 1674 1675 #if 0 1676 // don't close serial port during sleep 1677 1678 // close low-level device 1679 hci_stack->hci_transport->close(hci_stack->config); 1680 #endif 1681 1682 // sleep mode 1683 if (hci_stack->control && hci_stack->control->sleep){ 1684 (*hci_stack->control->sleep)(hci_stack->config); 1685 } 1686 1687 hci_stack->state = HCI_STATE_SLEEPING; 1688 } 1689 1690 static int hci_power_control_wake(void){ 1691 1692 log_info("hci_power_control_wake"); 1693 1694 // wake on 1695 if (hci_stack->control && hci_stack->control->wake){ 1696 (*hci_stack->control->wake)(hci_stack->config); 1697 } 1698 1699 #if 0 1700 // open low-level device 1701 int err = hci_stack->hci_transport->open(hci_stack->config); 1702 if (err){ 1703 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1704 if (hci_stack->control && hci_stack->control->off){ 1705 (*hci_stack->control->off)(hci_stack->config); 1706 } 1707 hci_emit_hci_open_failed(); 1708 return err; 1709 } 1710 #endif 1711 1712 return 0; 1713 } 1714 1715 static void hci_power_transition_to_initializing(void){ 1716 // set up state machine 1717 hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent 1718 hci_stack->hci_packet_buffer_reserved = 0; 1719 hci_stack->state = HCI_STATE_INITIALIZING; 1720 hci_stack->substate = 0; 1721 } 1722 1723 int hci_power_control(HCI_POWER_MODE power_mode){ 1724 1725 log_info("hci_power_control: %u, current mode %u", power_mode, hci_stack->state); 1726 1727 int err = 0; 1728 switch (hci_stack->state){ 1729 1730 case HCI_STATE_OFF: 1731 switch (power_mode){ 1732 case HCI_POWER_ON: 1733 err = hci_power_control_on(); 1734 if (err) { 1735 log_error("hci_power_control_on() error %u", err); 1736 return err; 1737 } 1738 hci_power_transition_to_initializing(); 1739 break; 1740 case HCI_POWER_OFF: 1741 // do nothing 1742 break; 1743 case HCI_POWER_SLEEP: 1744 // do nothing (with SLEEP == OFF) 1745 break; 1746 } 1747 break; 1748 1749 case HCI_STATE_INITIALIZING: 1750 switch (power_mode){ 1751 case HCI_POWER_ON: 1752 // do nothing 1753 break; 1754 case HCI_POWER_OFF: 1755 // no connections yet, just turn it off 1756 hci_power_control_off(); 1757 break; 1758 case HCI_POWER_SLEEP: 1759 // no connections yet, just turn it off 1760 hci_power_control_sleep(); 1761 break; 1762 } 1763 break; 1764 1765 case HCI_STATE_WORKING: 1766 switch (power_mode){ 1767 case HCI_POWER_ON: 1768 // do nothing 1769 break; 1770 case HCI_POWER_OFF: 1771 // see hci_run 1772 hci_stack->state = HCI_STATE_HALTING; 1773 break; 1774 case HCI_POWER_SLEEP: 1775 // see hci_run 1776 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1777 hci_stack->substate = 0; 1778 break; 1779 } 1780 break; 1781 1782 case HCI_STATE_HALTING: 1783 switch (power_mode){ 1784 case HCI_POWER_ON: 1785 hci_power_transition_to_initializing(); 1786 break; 1787 case HCI_POWER_OFF: 1788 // do nothing 1789 break; 1790 case HCI_POWER_SLEEP: 1791 // see hci_run 1792 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1793 hci_stack->substate = 0; 1794 break; 1795 } 1796 break; 1797 1798 case HCI_STATE_FALLING_ASLEEP: 1799 switch (power_mode){ 1800 case HCI_POWER_ON: 1801 1802 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1803 // nothing to do, if H4 supports power management 1804 if (bt_control_iphone_power_management_enabled()){ 1805 hci_stack->state = HCI_STATE_INITIALIZING; 1806 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1807 break; 1808 } 1809 #endif 1810 hci_power_transition_to_initializing(); 1811 break; 1812 case HCI_POWER_OFF: 1813 // see hci_run 1814 hci_stack->state = HCI_STATE_HALTING; 1815 break; 1816 case HCI_POWER_SLEEP: 1817 // do nothing 1818 break; 1819 } 1820 break; 1821 1822 case HCI_STATE_SLEEPING: 1823 switch (power_mode){ 1824 case HCI_POWER_ON: 1825 1826 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1827 // nothing to do, if H4 supports power management 1828 if (bt_control_iphone_power_management_enabled()){ 1829 hci_stack->state = HCI_STATE_INITIALIZING; 1830 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1831 hci_update_scan_enable(); 1832 break; 1833 } 1834 #endif 1835 err = hci_power_control_wake(); 1836 if (err) return err; 1837 hci_power_transition_to_initializing(); 1838 break; 1839 case HCI_POWER_OFF: 1840 hci_stack->state = HCI_STATE_HALTING; 1841 break; 1842 case HCI_POWER_SLEEP: 1843 // do nothing 1844 break; 1845 } 1846 break; 1847 } 1848 1849 // create internal event 1850 hci_emit_state(); 1851 1852 // trigger next/first action 1853 hci_run(); 1854 1855 return 0; 1856 } 1857 1858 static void hci_update_scan_enable(void){ 1859 // 2 = page scan, 1 = inq scan 1860 hci_stack->new_scan_enable_value = hci_stack->connectable << 1 | hci_stack->discoverable; 1861 hci_run(); 1862 } 1863 1864 void hci_discoverable_control(uint8_t enable){ 1865 if (enable) enable = 1; // normalize argument 1866 1867 if (hci_stack->discoverable == enable){ 1868 hci_emit_discoverable_enabled(hci_stack->discoverable); 1869 return; 1870 } 1871 1872 hci_stack->discoverable = enable; 1873 hci_update_scan_enable(); 1874 } 1875 1876 void hci_connectable_control(uint8_t enable){ 1877 if (enable) enable = 1; // normalize argument 1878 1879 // don't emit event 1880 if (hci_stack->connectable == enable) return; 1881 1882 hci_stack->connectable = enable; 1883 hci_update_scan_enable(); 1884 } 1885 1886 uint8_t * hci_local_bd_addr(void){ 1887 return hci_stack->local_bd_addr; 1888 } 1889 1890 void hci_run(){ 1891 1892 hci_connection_t * connection; 1893 linked_item_t * it; 1894 1895 // send continuation fragments first, as they block the prepared packet buffer 1896 if (hci_stack->acl_fragmentation_total_size > 0) { 1897 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(hci_stack->hci_packet_buffer); 1898 if (hci_can_send_prepared_acl_packet_now(con_handle)){ 1899 hci_connection_t *connection = hci_connection_for_handle(con_handle); 1900 if (connection) { 1901 hci_send_acl_packet_fragments(connection); 1902 return; 1903 } 1904 // connection gone -> discard further fragments 1905 hci_stack->acl_fragmentation_total_size = 0; 1906 hci_stack->acl_fragmentation_pos = 0; 1907 } 1908 } 1909 1910 if (!hci_can_send_command_packet_now()) return; 1911 1912 // global/non-connection oriented commands 1913 1914 // decline incoming connections 1915 if (hci_stack->decline_reason){ 1916 uint8_t reason = hci_stack->decline_reason; 1917 hci_stack->decline_reason = 0; 1918 hci_send_cmd(&hci_reject_connection_request, hci_stack->decline_addr, reason); 1919 return; 1920 } 1921 1922 // send scan enable 1923 if (hci_stack->state == HCI_STATE_WORKING && hci_stack->new_scan_enable_value != 0xff && hci_classic_supported()){ 1924 hci_send_cmd(&hci_write_scan_enable, hci_stack->new_scan_enable_value); 1925 hci_stack->new_scan_enable_value = 0xff; 1926 return; 1927 } 1928 1929 #ifdef HAVE_BLE 1930 // handle le scan 1931 if (hci_stack->state == HCI_STATE_WORKING){ 1932 switch(hci_stack->le_scanning_state){ 1933 case LE_START_SCAN: 1934 hci_stack->le_scanning_state = LE_SCANNING; 1935 hci_send_cmd(&hci_le_set_scan_enable, 1, 0); 1936 return; 1937 1938 case LE_STOP_SCAN: 1939 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1940 hci_send_cmd(&hci_le_set_scan_enable, 0, 0); 1941 return; 1942 default: 1943 break; 1944 } 1945 if (hci_stack->le_scan_type != 0xff){ 1946 // defaults: active scanning, accept all advertisement packets 1947 int scan_type = hci_stack->le_scan_type; 1948 hci_stack->le_scan_type = 0xff; 1949 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); 1950 return; 1951 } 1952 } 1953 #endif 1954 1955 // send pending HCI commands 1956 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 1957 connection = (hci_connection_t *) it; 1958 1959 switch(connection->state){ 1960 case SEND_CREATE_CONNECTION: 1961 switch(connection->address_type){ 1962 case BD_ADDR_TYPE_CLASSIC: 1963 log_info("sending hci_create_connection"); 1964 hci_send_cmd(&hci_create_connection, connection->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 1965 break; 1966 default: 1967 #ifdef HAVE_BLE 1968 log_info("sending hci_le_create_connection"); 1969 hci_send_cmd(&hci_le_create_connection, 1970 0x0060, // scan interval: 60 ms 1971 0x0030, // scan interval: 30 ms 1972 0, // don't use whitelist 1973 connection->address_type, // peer address type 1974 connection->address, // peer bd addr 1975 hci_stack->adv_addr_type, // our addr type: 1976 0x0008, // conn interval min 1977 0x0018, // conn interval max 1978 0, // conn latency 1979 0x0048, // supervision timeout 1980 0x0001, // min ce length 1981 0x0001 // max ce length 1982 ); 1983 1984 connection->state = SENT_CREATE_CONNECTION; 1985 #endif 1986 break; 1987 } 1988 return; 1989 1990 case RECEIVED_CONNECTION_REQUEST: 1991 log_info("sending hci_accept_connection_request"); 1992 connection->state = ACCEPTED_CONNECTION_REQUEST; 1993 if (connection->address_type == BD_ADDR_TYPE_CLASSIC){ 1994 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 1995 } else { 1996 // TODO: allows to customize synchronous connection parameters 1997 hci_send_cmd(&hci_accept_synchronous_connection_command, connection->address, 8000, 8000, 0xFFFF, 0x0060, 0xFF, 0x003F); 1998 } 1999 return; 2000 2001 #ifdef HAVE_BLE 2002 case SEND_CANCEL_CONNECTION: 2003 connection->state = SENT_CANCEL_CONNECTION; 2004 hci_send_cmd(&hci_le_create_connection_cancel); 2005 return; 2006 #endif 2007 case SEND_DISCONNECT: 2008 connection->state = SENT_DISCONNECT; 2009 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2010 return; 2011 2012 default: 2013 break; 2014 } 2015 2016 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 2017 log_info("responding to link key request"); 2018 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 2019 link_key_t link_key; 2020 link_key_type_t link_key_type; 2021 if ( hci_stack->remote_device_db 2022 && hci_stack->remote_device_db->get_link_key(connection->address, link_key, &link_key_type) 2023 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 2024 connection->link_key_type = link_key_type; 2025 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 2026 } else { 2027 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 2028 } 2029 return; 2030 } 2031 2032 if (connection->authentication_flags & DENY_PIN_CODE_REQUEST){ 2033 log_info("denying to pin request"); 2034 connectionClearAuthenticationFlags(connection, DENY_PIN_CODE_REQUEST); 2035 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 2036 return; 2037 } 2038 2039 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 2040 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 2041 log_info("IO Capability Request received, stack bondable %u, io cap %u", hci_stack->bondable, hci_stack->ssp_io_capability); 2042 if (hci_stack->bondable && (hci_stack->ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN)){ 2043 // tweak authentication requirements 2044 uint8_t authreq = hci_stack->ssp_authentication_requirement; 2045 if (connection->bonding_flags & BONDING_DEDICATED){ 2046 authreq = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING; 2047 } 2048 if (gap_mitm_protection_required_for_security_level(connection->requested_security_level)){ 2049 authreq |= 1; 2050 } 2051 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack->ssp_io_capability, NULL, authreq); 2052 } else { 2053 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 2054 } 2055 return; 2056 } 2057 2058 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 2059 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 2060 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 2061 return; 2062 } 2063 2064 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 2065 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 2066 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 2067 return; 2068 } 2069 2070 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 2071 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 2072 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 2073 return; 2074 } 2075 2076 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 2077 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 2078 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 2079 return; 2080 } 2081 if (connection->bonding_flags & BONDING_DISCONNECT_DEDICATED_DONE){ 2082 connection->bonding_flags &= ~BONDING_DISCONNECT_DEDICATED_DONE; 2083 connection->bonding_flags |= BONDING_EMIT_COMPLETE_ON_DISCONNECT; 2084 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // authentication done 2085 return; 2086 } 2087 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 2088 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 2089 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 2090 return; 2091 } 2092 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 2093 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 2094 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 2095 return; 2096 } 2097 2098 #ifdef HAVE_BLE 2099 if (connection->le_con_parameter_update_state == CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS){ 2100 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 2101 2102 uint16_t connection_interval_min = connection->le_conn_interval_min; 2103 connection->le_conn_interval_min = 0; 2104 hci_send_cmd(&hci_le_connection_update, connection->con_handle, connection_interval_min, 2105 connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout, 2106 0x0000, 0xffff); 2107 } 2108 #endif 2109 } 2110 2111 switch (hci_stack->state){ 2112 case HCI_STATE_INITIALIZING: 2113 hci_initializing_state_machine(); 2114 break; 2115 2116 case HCI_STATE_HALTING: 2117 2118 log_info("HCI_STATE_HALTING"); 2119 // close all open connections 2120 connection = (hci_connection_t *) hci_stack->connections; 2121 if (connection){ 2122 2123 // send disconnect 2124 if (!hci_can_send_command_packet_now()) return; 2125 2126 log_info("HCI_STATE_HALTING, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2127 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2128 2129 // send disconnected event right away - causes higher layer connections to get closed, too. 2130 hci_shutdown_connection(connection); 2131 return; 2132 } 2133 log_info("HCI_STATE_HALTING, calling off"); 2134 2135 // switch mode 2136 hci_power_control_off(); 2137 2138 log_info("HCI_STATE_HALTING, emitting state"); 2139 hci_emit_state(); 2140 log_info("HCI_STATE_HALTING, done"); 2141 break; 2142 2143 case HCI_STATE_FALLING_ASLEEP: 2144 switch(hci_stack->substate) { 2145 case 0: 2146 log_info("HCI_STATE_FALLING_ASLEEP"); 2147 // close all open connections 2148 connection = (hci_connection_t *) hci_stack->connections; 2149 2150 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2151 // don't close connections, if H4 supports power management 2152 if (bt_control_iphone_power_management_enabled()){ 2153 connection = NULL; 2154 } 2155 #endif 2156 if (connection){ 2157 2158 // send disconnect 2159 if (!hci_can_send_command_packet_now()) return; 2160 2161 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2162 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2163 2164 // send disconnected event right away - causes higher layer connections to get closed, too. 2165 hci_shutdown_connection(connection); 2166 return; 2167 } 2168 2169 if (hci_classic_supported()){ 2170 // disable page and inquiry scan 2171 if (!hci_can_send_command_packet_now()) return; 2172 2173 log_info("HCI_STATE_HALTING, disabling inq scans"); 2174 hci_send_cmd(&hci_write_scan_enable, hci_stack->connectable << 1); // drop inquiry scan but keep page scan 2175 2176 // continue in next sub state 2177 hci_stack->substate++; 2178 break; 2179 } 2180 // fall through for ble-only chips 2181 2182 case 2: 2183 log_info("HCI_STATE_HALTING, calling sleep"); 2184 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2185 // don't actually go to sleep, if H4 supports power management 2186 if (bt_control_iphone_power_management_enabled()){ 2187 // SLEEP MODE reached 2188 hci_stack->state = HCI_STATE_SLEEPING; 2189 hci_emit_state(); 2190 break; 2191 } 2192 #endif 2193 // switch mode 2194 hci_power_control_sleep(); // changes hci_stack->state to SLEEP 2195 hci_emit_state(); 2196 break; 2197 2198 default: 2199 break; 2200 } 2201 break; 2202 2203 default: 2204 break; 2205 } 2206 } 2207 2208 int hci_send_cmd_packet(uint8_t *packet, int size){ 2209 bd_addr_t addr; 2210 hci_connection_t * conn; 2211 // house-keeping 2212 2213 // create_connection? 2214 if (IS_COMMAND(packet, hci_create_connection)){ 2215 bt_flip_addr(addr, &packet[3]); 2216 log_info("Create_connection to %s", bd_addr_to_str(addr)); 2217 2218 conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2219 if (!conn){ 2220 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2221 if (!conn){ 2222 // notify client that alloc failed 2223 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 2224 return 0; // don't sent packet to controller 2225 } 2226 conn->state = SEND_CREATE_CONNECTION; 2227 } 2228 log_info("conn state %u", conn->state); 2229 switch (conn->state){ 2230 // if connection active exists 2231 case OPEN: 2232 // and OPEN, emit connection complete command, don't send to controller 2233 hci_emit_connection_complete(conn, 0); 2234 return 0; 2235 case SEND_CREATE_CONNECTION: 2236 // connection created by hci, e.g. dedicated bonding 2237 break; 2238 default: 2239 // otherwise, just ignore as it is already in the open process 2240 return 0; 2241 } 2242 conn->state = SENT_CREATE_CONNECTION; 2243 } 2244 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 2245 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 2246 } 2247 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 2248 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 2249 } 2250 2251 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 2252 if (hci_stack->remote_device_db){ 2253 bt_flip_addr(addr, &packet[3]); 2254 hci_stack->remote_device_db->delete_link_key(addr); 2255 } 2256 } 2257 2258 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply) 2259 || IS_COMMAND(packet, hci_pin_code_request_reply)){ 2260 bt_flip_addr(addr, &packet[3]); 2261 conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2262 if (conn){ 2263 connectionClearAuthenticationFlags(conn, LEGACY_PAIRING_ACTIVE); 2264 } 2265 } 2266 2267 if (IS_COMMAND(packet, hci_user_confirmation_request_negative_reply) 2268 || IS_COMMAND(packet, hci_user_confirmation_request_reply) 2269 || IS_COMMAND(packet, hci_user_passkey_request_negative_reply) 2270 || IS_COMMAND(packet, hci_user_passkey_request_reply)) { 2271 bt_flip_addr(addr, &packet[3]); 2272 conn = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2273 if (conn){ 2274 connectionClearAuthenticationFlags(conn, SSP_PAIRING_ACTIVE); 2275 } 2276 } 2277 2278 #ifdef HAVE_BLE 2279 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 2280 hci_stack->adv_addr_type = packet[8]; 2281 } 2282 if (IS_COMMAND(packet, hci_le_set_random_address)){ 2283 bt_flip_addr(hci_stack->adv_address, &packet[3]); 2284 } 2285 #endif 2286 2287 hci_stack->num_cmd_packets--; 2288 2289 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, packet, size); 2290 int err = hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 2291 2292 // release packet buffer for synchronous transport implementations 2293 if (hci_transport_synchronous() && (packet == hci_stack->hci_packet_buffer)){ 2294 hci_stack->hci_packet_buffer_reserved = 0; 2295 } 2296 2297 return err; 2298 } 2299 2300 // disconnect because of security block 2301 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 2302 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2303 if (!connection) return; 2304 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 2305 } 2306 2307 2308 // Configure Secure Simple Pairing 2309 2310 // enable will enable SSP during init 2311 void hci_ssp_set_enable(int enable){ 2312 hci_stack->ssp_enable = enable; 2313 } 2314 2315 int hci_local_ssp_activated(){ 2316 return hci_ssp_supported() && hci_stack->ssp_enable; 2317 } 2318 2319 // if set, BTstack will respond to io capability request using authentication requirement 2320 void hci_ssp_set_io_capability(int io_capability){ 2321 hci_stack->ssp_io_capability = io_capability; 2322 } 2323 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 2324 hci_stack->ssp_authentication_requirement = authentication_requirement; 2325 } 2326 2327 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 2328 void hci_ssp_set_auto_accept(int auto_accept){ 2329 hci_stack->ssp_auto_accept = auto_accept; 2330 } 2331 2332 /** 2333 * pre: numcmds >= 0 - it's allowed to send a command to the controller 2334 */ 2335 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 2336 2337 if (!hci_can_send_command_packet_now()){ 2338 log_error("hci_send_cmd called but cannot send packet now"); 2339 return 0; 2340 } 2341 2342 // for HCI INITIALIZATION 2343 // log_info("hci_send_cmd: opcode %04x", cmd->opcode); 2344 hci_stack->last_cmd_opcode = cmd->opcode; 2345 2346 hci_reserve_packet_buffer(); 2347 uint8_t * packet = hci_stack->hci_packet_buffer; 2348 2349 va_list argptr; 2350 va_start(argptr, cmd); 2351 uint16_t size = hci_create_cmd_internal(packet, cmd, argptr); 2352 va_end(argptr); 2353 2354 return hci_send_cmd_packet(packet, size); 2355 } 2356 2357 // Create various non-HCI events. 2358 // TODO: generalize, use table similar to hci_create_command 2359 2360 void hci_emit_state(){ 2361 log_info("BTSTACK_EVENT_STATE %u", hci_stack->state); 2362 uint8_t event[3]; 2363 event[0] = BTSTACK_EVENT_STATE; 2364 event[1] = sizeof(event) - 2; 2365 event[2] = hci_stack->state; 2366 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2367 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2368 } 2369 2370 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 2371 uint8_t event[13]; 2372 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 2373 event[1] = sizeof(event) - 2; 2374 event[2] = status; 2375 bt_store_16(event, 3, conn->con_handle); 2376 bt_flip_addr(&event[5], conn->address); 2377 event[11] = 1; // ACL connection 2378 event[12] = 0; // encryption disabled 2379 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2380 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2381 } 2382 2383 void hci_emit_le_connection_complete(uint8_t address_type, bd_addr_t address, uint16_t conn_handle, uint8_t status){ 2384 uint8_t event[21]; 2385 event[0] = HCI_EVENT_LE_META; 2386 event[1] = sizeof(event) - 2; 2387 event[2] = HCI_SUBEVENT_LE_CONNECTION_COMPLETE; 2388 event[3] = status; 2389 bt_store_16(event, 4, conn_handle); 2390 event[6] = 0; // TODO: role 2391 event[7] = address_type; 2392 bt_flip_addr(&event[8], address); 2393 bt_store_16(event, 14, 0); // interval 2394 bt_store_16(event, 16, 0); // latency 2395 bt_store_16(event, 18, 0); // supervision timeout 2396 event[20] = 0; // master clock accuracy 2397 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2398 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2399 } 2400 2401 void hci_emit_disconnection_complete(uint16_t handle, uint8_t reason){ 2402 uint8_t event[6]; 2403 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 2404 event[1] = sizeof(event) - 2; 2405 event[2] = 0; // status = OK 2406 bt_store_16(event, 3, handle); 2407 event[5] = reason; 2408 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2409 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2410 } 2411 2412 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 2413 if (disable_l2cap_timeouts) return; 2414 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 2415 uint8_t event[4]; 2416 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 2417 event[1] = sizeof(event) - 2; 2418 bt_store_16(event, 2, conn->con_handle); 2419 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2420 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2421 } 2422 2423 void hci_emit_nr_connections_changed(){ 2424 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 2425 uint8_t event[3]; 2426 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 2427 event[1] = sizeof(event) - 2; 2428 event[2] = nr_hci_connections(); 2429 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2430 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2431 } 2432 2433 void hci_emit_hci_open_failed(){ 2434 log_info("BTSTACK_EVENT_POWERON_FAILED"); 2435 uint8_t event[2]; 2436 event[0] = BTSTACK_EVENT_POWERON_FAILED; 2437 event[1] = sizeof(event) - 2; 2438 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2439 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2440 } 2441 2442 #ifndef EMBEDDED 2443 void hci_emit_btstack_version() { 2444 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 2445 uint8_t event[6]; 2446 event[0] = BTSTACK_EVENT_VERSION; 2447 event[1] = sizeof(event) - 2; 2448 event[2] = BTSTACK_MAJOR; 2449 event[3] = BTSTACK_MINOR; 2450 bt_store_16(event, 4, BTSTACK_REVISION); 2451 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2452 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2453 } 2454 #endif 2455 2456 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 2457 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 2458 uint8_t event[3]; 2459 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 2460 event[1] = sizeof(event) - 2; 2461 event[2] = enabled; 2462 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2463 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2464 } 2465 2466 void hci_emit_remote_name_cached(bd_addr_t addr, device_name_t *name){ 2467 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 2468 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 2469 event[1] = sizeof(event) - 2 - 1; 2470 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 2471 bt_flip_addr(&event[3], addr); 2472 memcpy(&event[9], name, 248); 2473 2474 event[9+248] = 0; // assert \0 for log_info 2475 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(addr), &event[9]); 2476 2477 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 2478 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 2479 } 2480 2481 void hci_emit_discoverable_enabled(uint8_t enabled){ 2482 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 2483 uint8_t event[3]; 2484 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 2485 event[1] = sizeof(event) - 2; 2486 event[2] = enabled; 2487 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2488 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2489 } 2490 2491 void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){ 2492 log_info("hci_emit_security_level %u for handle %x", level, con_handle); 2493 uint8_t event[5]; 2494 int pos = 0; 2495 event[pos++] = GAP_SECURITY_LEVEL; 2496 event[pos++] = sizeof(event) - 2; 2497 bt_store_16(event, 2, con_handle); 2498 pos += 2; 2499 event[pos++] = level; 2500 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2501 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2502 } 2503 2504 void hci_emit_dedicated_bonding_result(bd_addr_t address, uint8_t status){ 2505 log_info("hci_emit_dedicated_bonding_result %u ", status); 2506 uint8_t event[9]; 2507 int pos = 0; 2508 event[pos++] = GAP_DEDICATED_BONDING_COMPLETED; 2509 event[pos++] = sizeof(event) - 2; 2510 event[pos++] = status; 2511 bt_flip_addr( &event[pos], address); 2512 pos += 6; 2513 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2514 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2515 } 2516 2517 // query if remote side supports SSP 2518 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 2519 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2520 if (!connection) return 0; 2521 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 2522 } 2523 2524 int hci_ssp_supported_on_both_sides(hci_con_handle_t handle){ 2525 return hci_local_ssp_activated() && hci_remote_ssp_supported(handle); 2526 } 2527 2528 // GAP API 2529 /** 2530 * @bbrief enable/disable bonding. default is enabled 2531 * @praram enabled 2532 */ 2533 void gap_set_bondable_mode(int enable){ 2534 hci_stack->bondable = enable ? 1 : 0; 2535 } 2536 2537 /** 2538 * @brief map link keys to security levels 2539 */ 2540 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 2541 switch (link_key_type){ 2542 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 2543 return LEVEL_4; 2544 case COMBINATION_KEY: 2545 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 2546 return LEVEL_3; 2547 default: 2548 return LEVEL_2; 2549 } 2550 } 2551 2552 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 2553 if (!connection) return LEVEL_0; 2554 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 2555 return gap_security_level_for_link_key_type(connection->link_key_type); 2556 } 2557 2558 2559 int gap_mitm_protection_required_for_security_level(gap_security_level_t level){ 2560 log_info("gap_mitm_protection_required_for_security_level %u", level); 2561 return level > LEVEL_2; 2562 } 2563 2564 /** 2565 * @brief get current security level 2566 */ 2567 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 2568 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2569 if (!connection) return LEVEL_0; 2570 return gap_security_level_for_connection(connection); 2571 } 2572 2573 /** 2574 * @brief request connection to device to 2575 * @result GAP_AUTHENTICATION_RESULT 2576 */ 2577 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 2578 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2579 if (!connection){ 2580 hci_emit_security_level(con_handle, LEVEL_0); 2581 return; 2582 } 2583 gap_security_level_t current_level = gap_security_level(con_handle); 2584 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 2585 if (current_level >= requested_level){ 2586 hci_emit_security_level(con_handle, current_level); 2587 return; 2588 } 2589 2590 connection->requested_security_level = requested_level; 2591 2592 #if 0 2593 // sending encryption request without a link key results in an error. 2594 // TODO: figure out how to use it properly 2595 2596 // would enabling ecnryption suffice (>= LEVEL_2)? 2597 if (hci_stack->remote_device_db){ 2598 link_key_type_t link_key_type; 2599 link_key_t link_key; 2600 if (hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type)){ 2601 if (gap_security_level_for_link_key_type(link_key_type) >= requested_level){ 2602 connection->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 2603 return; 2604 } 2605 } 2606 } 2607 #endif 2608 2609 // try to authenticate connection 2610 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 2611 hci_run(); 2612 } 2613 2614 /** 2615 * @brief start dedicated bonding with device. disconnect after bonding 2616 * @param device 2617 * @param request MITM protection 2618 * @result GAP_DEDICATED_BONDING_COMPLETE 2619 */ 2620 int gap_dedicated_bonding(bd_addr_t device, int mitm_protection_required){ 2621 2622 // create connection state machine 2623 hci_connection_t * connection = create_connection_for_bd_addr_and_type(device, BD_ADDR_TYPE_CLASSIC); 2624 2625 if (!connection){ 2626 return BTSTACK_MEMORY_ALLOC_FAILED; 2627 } 2628 2629 // delete linkn key 2630 hci_drop_link_key_for_bd_addr(device); 2631 2632 // configure LEVEL_2/3, dedicated bonding 2633 connection->state = SEND_CREATE_CONNECTION; 2634 connection->requested_security_level = mitm_protection_required ? LEVEL_3 : LEVEL_2; 2635 log_info("gap_dedicated_bonding, mitm %u -> level %u", mitm_protection_required, connection->requested_security_level); 2636 connection->bonding_flags = BONDING_DEDICATED; 2637 2638 // wait for GAP Security Result and send GAP Dedicated Bonding complete 2639 2640 // handle: connnection failure (connection complete != ok) 2641 // handle: authentication failure 2642 // handle: disconnect on done 2643 2644 hci_run(); 2645 2646 return 0; 2647 } 2648 2649 void gap_set_local_name(const char * local_name){ 2650 hci_stack->local_name = local_name; 2651 } 2652 2653 le_command_status_t le_central_start_scan(){ 2654 if (hci_stack->le_scanning_state == LE_SCANNING) return BLE_PERIPHERAL_OK; 2655 hci_stack->le_scanning_state = LE_START_SCAN; 2656 hci_run(); 2657 return BLE_PERIPHERAL_OK; 2658 } 2659 2660 le_command_status_t le_central_stop_scan(){ 2661 if ( hci_stack->le_scanning_state == LE_SCAN_IDLE) return BLE_PERIPHERAL_OK; 2662 hci_stack->le_scanning_state = LE_STOP_SCAN; 2663 hci_run(); 2664 return BLE_PERIPHERAL_OK; 2665 } 2666 2667 void le_central_set_scan_parameters(uint8_t scan_type, uint16_t scan_interval, uint16_t scan_window){ 2668 hci_stack->le_scan_type = scan_type; 2669 hci_stack->le_scan_interval = scan_interval; 2670 hci_stack->le_scan_window = scan_window; 2671 hci_run(); 2672 } 2673 2674 le_command_status_t le_central_connect(bd_addr_t addr, bd_addr_type_t addr_type){ 2675 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 2676 if (!conn){ 2677 log_info("le_central_connect: no connection exists yet, creating context"); 2678 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 2679 if (!conn){ 2680 // notify client that alloc failed 2681 hci_emit_le_connection_complete(addr_type, addr, 0, BTSTACK_MEMORY_ALLOC_FAILED); 2682 log_info("le_central_connect: failed to alloc hci_connection_t"); 2683 return BLE_PERIPHERAL_NOT_CONNECTED; // don't sent packet to controller 2684 } 2685 conn->state = SEND_CREATE_CONNECTION; 2686 log_info("le_central_connect: send create connection next"); 2687 hci_run(); 2688 return BLE_PERIPHERAL_OK; 2689 } 2690 2691 if (!hci_is_le_connection(conn) || 2692 conn->state == SEND_CREATE_CONNECTION || 2693 conn->state == SENT_CREATE_CONNECTION) { 2694 hci_emit_le_connection_complete(conn->address_type, conn->address, 0, ERROR_CODE_COMMAND_DISALLOWED); 2695 log_error("le_central_connect: classic connection or connect is already being created"); 2696 return BLE_PERIPHERAL_IN_WRONG_STATE; 2697 } 2698 2699 log_info("le_central_connect: context exists with state %u", conn->state); 2700 hci_emit_le_connection_complete(conn->address_type, conn->address, conn->con_handle, 0); 2701 hci_run(); 2702 return BLE_PERIPHERAL_OK; 2703 } 2704 2705 // @assumption: only a single outgoing LE Connection exists 2706 static hci_connection_t * le_central_get_outgoing_connection(){ 2707 linked_item_t *it; 2708 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 2709 hci_connection_t * conn = (hci_connection_t *) it; 2710 if (!hci_is_le_connection(conn)) continue; 2711 switch (conn->state){ 2712 case SEND_CREATE_CONNECTION: 2713 case SENT_CREATE_CONNECTION: 2714 return conn; 2715 default: 2716 break; 2717 }; 2718 } 2719 return NULL; 2720 } 2721 2722 le_command_status_t le_central_connect_cancel(){ 2723 hci_connection_t * conn = le_central_get_outgoing_connection(); 2724 switch (conn->state){ 2725 case SEND_CREATE_CONNECTION: 2726 // skip sending create connection and emit event instead 2727 hci_emit_le_connection_complete(conn->address_type, conn->address, 0, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 2728 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 2729 btstack_memory_hci_connection_free( conn ); 2730 break; 2731 case SENT_CREATE_CONNECTION: 2732 // request to send cancel connection 2733 conn->state = SEND_CANCEL_CONNECTION; 2734 hci_run(); 2735 break; 2736 default: 2737 break; 2738 } 2739 return BLE_PERIPHERAL_OK; 2740 } 2741 2742 /** 2743 * @brief Updates the connection parameters for a given LE connection 2744 * @param handle 2745 * @param conn_interval_min (unit: 1.25ms) 2746 * @param conn_interval_max (unit: 1.25ms) 2747 * @param conn_latency 2748 * @param supervision_timeout (unit: 10ms) 2749 * @returns 0 if ok 2750 */ 2751 int gap_update_connection_parameters(hci_con_handle_t con_handle, uint16_t conn_interval_min, 2752 uint16_t conn_interval_max, uint16_t conn_latency, uint16_t supervision_timeout){ 2753 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2754 if (!connection) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2755 connection->le_conn_interval_min = conn_interval_min; 2756 connection->le_conn_interval_max = conn_interval_max; 2757 connection->le_conn_latency = conn_latency; 2758 connection->le_supervision_timeout = supervision_timeout; 2759 return 0; 2760 } 2761 2762 le_command_status_t gap_disconnect(hci_con_handle_t handle){ 2763 hci_connection_t * conn = hci_connection_for_handle(handle); 2764 if (!conn){ 2765 hci_emit_disconnection_complete(handle, 0); 2766 return BLE_PERIPHERAL_OK; 2767 } 2768 conn->state = SEND_DISCONNECT; 2769 hci_run(); 2770 return BLE_PERIPHERAL_OK; 2771 } 2772 2773 void hci_disconnect_all(){ 2774 linked_list_iterator_t it; 2775 linked_list_iterator_init(&it, &hci_stack->connections); 2776 while (linked_list_iterator_has_next(&it)){ 2777 hci_connection_t * con = (hci_connection_t*) linked_list_iterator_next(&it); 2778 if (con->state == SENT_DISCONNECT) continue; 2779 con->state = SEND_DISCONNECT; 2780 } 2781 hci_run(); 2782 } 2783