1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 /* 39 * hci.c 40 * 41 * Created by Matthias Ringwald on 4/29/09. 42 * 43 */ 44 45 #include "btstack-config.h" 46 47 #include "hci.h" 48 #include "gap.h" 49 50 #include <stdarg.h> 51 #include <string.h> 52 #include <stdio.h> 53 54 #ifndef EMBEDDED 55 #ifdef _WIN32 56 #include "Winsock2.h" 57 #else 58 #include <unistd.h> // gethostbyname 59 #endif 60 #include <btstack/version.h> 61 #endif 62 63 #include "btstack_memory.h" 64 #include "debug.h" 65 #include "hci_dump.h" 66 67 #include <btstack/linked_list.h> 68 #include <btstack/hci_cmds.h> 69 70 #define HCI_CONNECTION_TIMEOUT_MS 10000 71 72 #define HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP 11 73 74 #ifdef USE_BLUETOOL 75 #include "../platforms/ios/src/bt_control_iphone.h" 76 #endif 77 78 static void hci_update_scan_enable(void); 79 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection); 80 static void hci_connection_timeout_handler(timer_source_t *timer); 81 static void hci_connection_timestamp(hci_connection_t *connection); 82 static int hci_power_control_on(void); 83 static void hci_power_control_off(void); 84 static void hci_state_reset(); 85 86 // the STACK is here 87 #ifndef HAVE_MALLOC 88 static hci_stack_t hci_stack_static; 89 #endif 90 static hci_stack_t * hci_stack = NULL; 91 92 // test helper 93 static uint8_t disable_l2cap_timeouts = 0; 94 95 /** 96 * create connection for given address 97 * 98 * @return connection OR NULL, if no memory left 99 */ 100 static hci_connection_t * create_connection_for_bd_addr_and_type(bd_addr_t addr, bd_addr_type_t addr_type){ 101 log_info("create_connection_for_addr %s", bd_addr_to_str(addr)); 102 hci_connection_t * conn = btstack_memory_hci_connection_get(); 103 if (!conn) return NULL; 104 BD_ADDR_COPY(conn->address, addr); 105 conn->address_type = addr_type; 106 conn->con_handle = 0xffff; 107 conn->authentication_flags = AUTH_FLAGS_NONE; 108 conn->bonding_flags = 0; 109 conn->requested_security_level = LEVEL_0; 110 linked_item_set_user(&conn->timeout.item, conn); 111 conn->timeout.process = hci_connection_timeout_handler; 112 hci_connection_timestamp(conn); 113 conn->acl_recombination_length = 0; 114 conn->acl_recombination_pos = 0; 115 conn->num_acl_packets_sent = 0; 116 conn->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 117 linked_list_add(&hci_stack->connections, (linked_item_t *) conn); 118 return conn; 119 } 120 121 122 /** 123 * get le connection parameter range 124 * 125 * @return le connection parameter range struct 126 */ 127 le_connection_parameter_range_t gap_le_get_connection_parameter_range(){ 128 return hci_stack->le_connection_parameter_range; 129 } 130 131 /** 132 * set le connection parameter range 133 * 134 */ 135 136 void gap_le_set_connection_parameter_range(le_connection_parameter_range_t range){ 137 hci_stack->le_connection_parameter_range.le_conn_interval_min = range.le_conn_interval_min; 138 hci_stack->le_connection_parameter_range.le_conn_interval_max = range.le_conn_interval_max; 139 hci_stack->le_connection_parameter_range.le_conn_interval_min = range.le_conn_latency_min; 140 hci_stack->le_connection_parameter_range.le_conn_interval_max = range.le_conn_latency_max; 141 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = range.le_supervision_timeout_min; 142 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = range.le_supervision_timeout_max; 143 } 144 145 /** 146 * get hci connections iterator 147 * 148 * @return hci connections iterator 149 */ 150 151 void hci_connections_get_iterator(linked_list_iterator_t *it){ 152 linked_list_iterator_init(it, &hci_stack->connections); 153 } 154 155 /** 156 * get connection for a given handle 157 * 158 * @return connection OR NULL, if not found 159 */ 160 hci_connection_t * hci_connection_for_handle(hci_con_handle_t con_handle){ 161 linked_list_iterator_t it; 162 linked_list_iterator_init(&it, &hci_stack->connections); 163 while (linked_list_iterator_has_next(&it)){ 164 hci_connection_t * item = (hci_connection_t *) linked_list_iterator_next(&it); 165 if ( item->con_handle == con_handle ) { 166 return item; 167 } 168 } 169 return NULL; 170 } 171 172 /** 173 * get connection for given address 174 * 175 * @return connection OR NULL, if not found 176 */ 177 hci_connection_t * hci_connection_for_bd_addr_and_type(bd_addr_t * addr, bd_addr_type_t addr_type){ 178 linked_list_iterator_t it; 179 linked_list_iterator_init(&it, &hci_stack->connections); 180 while (linked_list_iterator_has_next(&it)){ 181 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 182 if (connection->address_type != addr_type) continue; 183 if (memcmp(addr, connection->address, 6) != 0) continue; 184 return connection; 185 } 186 return NULL; 187 } 188 189 static void hci_connection_timeout_handler(timer_source_t *timer){ 190 hci_connection_t * connection = (hci_connection_t *) linked_item_get_user(&timer->item); 191 #ifdef HAVE_TIME 192 struct timeval tv; 193 gettimeofday(&tv, NULL); 194 if (tv.tv_sec >= connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000) { 195 // connections might be timed out 196 hci_emit_l2cap_check_timeout(connection); 197 } 198 #endif 199 #ifdef HAVE_TICK 200 if (embedded_get_ticks() > connection->timestamp + embedded_ticks_for_ms(HCI_CONNECTION_TIMEOUT_MS)){ 201 // connections might be timed out 202 hci_emit_l2cap_check_timeout(connection); 203 } 204 #endif 205 run_loop_set_timer(timer, HCI_CONNECTION_TIMEOUT_MS); 206 run_loop_add_timer(timer); 207 } 208 209 static void hci_connection_timestamp(hci_connection_t *connection){ 210 #ifdef HAVE_TIME 211 gettimeofday(&connection->timestamp, NULL); 212 #endif 213 #ifdef HAVE_TICK 214 connection->timestamp = embedded_get_ticks(); 215 #endif 216 } 217 218 219 inline static void connectionSetAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 220 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags | flags); 221 } 222 223 inline static void connectionClearAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 224 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags & ~flags); 225 } 226 227 228 /** 229 * add authentication flags and reset timer 230 * @note: assumes classic connection 231 */ 232 static void hci_add_connection_flags_for_flipped_bd_addr(uint8_t *bd_addr, hci_authentication_flags_t flags){ 233 bd_addr_t addr; 234 bt_flip_addr(addr, *(bd_addr_t *) bd_addr); 235 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 236 if (conn) { 237 connectionSetAuthenticationFlags(conn, flags); 238 hci_connection_timestamp(conn); 239 } 240 } 241 242 int hci_authentication_active_for_handle(hci_con_handle_t handle){ 243 hci_connection_t * conn = hci_connection_for_handle(handle); 244 if (!conn) return 0; 245 if (conn->authentication_flags & LEGACY_PAIRING_ACTIVE) return 1; 246 if (conn->authentication_flags & SSP_PAIRING_ACTIVE) return 1; 247 return 0; 248 } 249 250 void hci_drop_link_key_for_bd_addr(bd_addr_t *addr){ 251 if (hci_stack->remote_device_db) { 252 hci_stack->remote_device_db->delete_link_key(addr); 253 } 254 } 255 256 int hci_is_le_connection(hci_connection_t * connection){ 257 return connection->address_type == BD_ADDR_TYPE_LE_PUBLIC || 258 connection->address_type == BD_ADDR_TYPE_LE_RANDOM; 259 } 260 261 262 /** 263 * count connections 264 */ 265 static int nr_hci_connections(void){ 266 int count = 0; 267 linked_item_t *it; 268 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next, count++); 269 return count; 270 } 271 272 /** 273 * Dummy handler called by HCI 274 */ 275 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 276 } 277 278 uint8_t hci_number_outgoing_packets(hci_con_handle_t handle){ 279 hci_connection_t * connection = hci_connection_for_handle(handle); 280 if (!connection) { 281 log_error("hci_number_outgoing_packets: connection for handle %u does not exist!", handle); 282 return 0; 283 } 284 return connection->num_acl_packets_sent; 285 } 286 287 uint8_t hci_number_free_acl_slots_for_handle(hci_con_handle_t con_handle){ 288 289 int num_packets_sent_classic = 0; 290 int num_packets_sent_le = 0; 291 292 bd_addr_type_t address_type = BD_ADDR_TYPE_UNKNOWN; 293 294 linked_item_t *it; 295 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 296 hci_connection_t * connection = (hci_connection_t *) it; 297 if (connection->address_type == BD_ADDR_TYPE_CLASSIC){ 298 num_packets_sent_classic += connection->num_acl_packets_sent; 299 } else { 300 num_packets_sent_le += connection->num_acl_packets_sent; 301 } 302 // ignore connections that are not open, e.g., in state RECEIVED_DISCONNECTION_COMPLETE 303 if (connection->con_handle == con_handle && connection->state == OPEN){ 304 address_type = connection->address_type; 305 } 306 } 307 308 int free_slots_classic = hci_stack->acl_packets_total_num - num_packets_sent_classic; 309 int free_slots_le = 0; 310 311 if (free_slots_classic < 0){ 312 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); 313 return 0; 314 } 315 316 if (hci_stack->le_acl_packets_total_num){ 317 // if we have LE slots, they are used 318 free_slots_le = hci_stack->le_acl_packets_total_num - num_packets_sent_le; 319 if (free_slots_le < 0){ 320 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); 321 return 0; 322 } 323 } else { 324 // otherwise, classic slots are used for LE, too 325 free_slots_classic -= num_packets_sent_le; 326 if (free_slots_classic < 0){ 327 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); 328 return 0; 329 } 330 } 331 332 switch (address_type){ 333 case BD_ADDR_TYPE_UNKNOWN: 334 log_error("hci_number_free_acl_slots: handle 0x%04x not in connection list", con_handle); 335 return 0; 336 337 case BD_ADDR_TYPE_CLASSIC: 338 return free_slots_classic; 339 340 default: 341 if (hci_stack->le_acl_packets_total_num){ 342 return free_slots_le; 343 } 344 return free_slots_classic; 345 } 346 } 347 348 // new functions replacing hci_can_send_packet_now[_using_packet_buffer] 349 int hci_can_send_command_packet_now(void){ 350 if (hci_stack->hci_packet_buffer_reserved) return 0; 351 352 // check for async hci transport implementations 353 if (hci_stack->hci_transport->can_send_packet_now){ 354 if (!hci_stack->hci_transport->can_send_packet_now(HCI_COMMAND_DATA_PACKET)){ 355 return 0; 356 } 357 } 358 359 return hci_stack->num_cmd_packets > 0; 360 } 361 362 int hci_can_send_prepared_acl_packet_now(hci_con_handle_t con_handle) { 363 // check for async hci transport implementations 364 if (hci_stack->hci_transport->can_send_packet_now){ 365 if (!hci_stack->hci_transport->can_send_packet_now(HCI_ACL_DATA_PACKET)){ 366 return 0; 367 } 368 } 369 return hci_number_free_acl_slots_for_handle(con_handle) > 0; 370 } 371 372 int hci_can_send_acl_packet_now(hci_con_handle_t con_handle){ 373 if (hci_stack->hci_packet_buffer_reserved) return 0; 374 return hci_can_send_prepared_acl_packet_now(con_handle); 375 } 376 377 // used for internal checks in l2cap[-le].c 378 int hci_is_packet_buffer_reserved(void){ 379 return hci_stack->hci_packet_buffer_reserved; 380 } 381 382 // reserves outgoing packet buffer. @returns 1 if successful 383 int hci_reserve_packet_buffer(void){ 384 if (hci_stack->hci_packet_buffer_reserved) { 385 log_error("hci_reserve_packet_buffer called but buffer already reserved"); 386 return 0; 387 } 388 hci_stack->hci_packet_buffer_reserved = 1; 389 return 1; 390 } 391 392 void hci_release_packet_buffer(void){ 393 hci_stack->hci_packet_buffer_reserved = 0; 394 } 395 396 // assumption: synchronous implementations don't provide can_send_packet_now as they don't keep the buffer after the call 397 int hci_transport_synchronous(void){ 398 return hci_stack->hci_transport->can_send_packet_now == NULL; 399 } 400 401 uint16_t hci_max_acl_le_data_packet_length(void){ 402 return hci_stack->le_data_packets_length > 0 ? hci_stack->le_data_packets_length : hci_stack->acl_data_packet_length; 403 } 404 405 static int hci_send_acl_packet_fragments(hci_connection_t *connection){ 406 407 // 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); 408 409 // max ACL data packet length depends on connection type (LE vs. Classic) and available buffers 410 uint16_t max_acl_data_packet_length = hci_stack->acl_data_packet_length; 411 if (hci_is_le_connection(connection) && hci_stack->le_data_packets_length > 0){ 412 max_acl_data_packet_length = hci_stack->le_data_packets_length; 413 } 414 415 // testing: reduce buffer to minimum 416 // max_acl_data_packet_length = 52; 417 418 int err; 419 // multiple packets could be send on a synchronous HCI transport 420 while (1){ 421 422 // get current data 423 const uint16_t acl_header_pos = hci_stack->acl_fragmentation_pos - 4; 424 int current_acl_data_packet_length = hci_stack->acl_fragmentation_total_size - hci_stack->acl_fragmentation_pos; 425 int more_fragments = 0; 426 427 // if ACL packet is larger than Bluetooth packet buffer, only send max_acl_data_packet_length 428 if (current_acl_data_packet_length > max_acl_data_packet_length){ 429 more_fragments = 1; 430 current_acl_data_packet_length = max_acl_data_packet_length; 431 } 432 433 // copy handle_and_flags if not first fragment and update packet boundary flags to be 01 (continuing fragmnent) 434 if (acl_header_pos > 0){ 435 uint16_t handle_and_flags = READ_BT_16(hci_stack->hci_packet_buffer, 0); 436 handle_and_flags = (handle_and_flags & 0xcfff) | (1 << 12); 437 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos, handle_and_flags); 438 } 439 440 // update header len 441 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos + 2, current_acl_data_packet_length); 442 443 // count packet 444 connection->num_acl_packets_sent++; 445 446 // send packet 447 uint8_t * packet = &hci_stack->hci_packet_buffer[acl_header_pos]; 448 const int size = current_acl_data_packet_length + 4; 449 hci_dump_packet(HCI_ACL_DATA_PACKET, 0, packet, size); 450 err = hci_stack->hci_transport->send_packet(HCI_ACL_DATA_PACKET, packet, size); 451 452 // done yet? 453 if (!more_fragments) break; 454 455 // update start of next fragment to send 456 hci_stack->acl_fragmentation_pos += current_acl_data_packet_length; 457 458 // can send more? 459 if (!hci_can_send_prepared_acl_packet_now(connection->con_handle)) return err; 460 } 461 462 // done 463 hci_stack->acl_fragmentation_pos = 0; 464 hci_stack->acl_fragmentation_total_size = 0; 465 466 // release buffer now for synchronous transport 467 if (hci_transport_synchronous()){ 468 hci_release_packet_buffer(); 469 } 470 471 return err; 472 } 473 474 // pre: caller has reserved the packet buffer 475 int hci_send_acl_packet_buffer(int size){ 476 477 // log_info("hci_send_acl_packet_buffer size %u", size); 478 479 if (!hci_stack->hci_packet_buffer_reserved) { 480 log_error("hci_send_acl_packet_buffer called without reserving packet buffer"); 481 return 0; 482 } 483 484 uint8_t * packet = hci_stack->hci_packet_buffer; 485 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 486 487 // check for free places on Bluetooth module 488 if (!hci_can_send_prepared_acl_packet_now(con_handle)) { 489 log_error("hci_send_acl_packet_buffer called but no free ACL buffers on controller"); 490 hci_release_packet_buffer(); 491 return BTSTACK_ACL_BUFFERS_FULL; 492 } 493 494 hci_connection_t *connection = hci_connection_for_handle( con_handle); 495 if (!connection) { 496 log_error("hci_send_acl_packet_buffer called but no connection for handle 0x%04x", con_handle); 497 hci_release_packet_buffer(); 498 return 0; 499 } 500 hci_connection_timestamp(connection); 501 502 // hci_dump_packet( HCI_ACL_DATA_PACKET, 0, packet, size); 503 504 // setup data 505 hci_stack->acl_fragmentation_total_size = size; 506 hci_stack->acl_fragmentation_pos = 4; // start of L2CAP packet 507 508 return hci_send_acl_packet_fragments(connection); 509 } 510 511 static void acl_handler(uint8_t *packet, int size){ 512 513 // log_info("acl_handler: size %u", size); 514 515 // get info 516 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 517 hci_connection_t *conn = hci_connection_for_handle(con_handle); 518 uint8_t acl_flags = READ_ACL_FLAGS(packet); 519 uint16_t acl_length = READ_ACL_LENGTH(packet); 520 521 // ignore non-registered handle 522 if (!conn){ 523 log_error( "hci.c: acl_handler called with non-registered handle %u!" , con_handle); 524 return; 525 } 526 527 // assert packet is complete 528 if (acl_length + 4 != size){ 529 log_error("hci.c: acl_handler called with ACL packet of wrong size %u, expected %u => dropping packet", size, acl_length + 4); 530 return; 531 } 532 533 // update idle timestamp 534 hci_connection_timestamp(conn); 535 536 // handle different packet types 537 switch (acl_flags & 0x03) { 538 539 case 0x01: // continuation fragment 540 541 // sanity checks 542 if (conn->acl_recombination_pos == 0) { 543 log_error( "ACL Cont Fragment but no first fragment for handle 0x%02x", con_handle); 544 return; 545 } 546 if (conn->acl_recombination_pos + acl_length > 4 + HCI_ACL_BUFFER_SIZE){ 547 log_error( "ACL Cont Fragment to large: combined packet %u > buffer size %u for handle 0x%02x", 548 conn->acl_recombination_pos + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle); 549 conn->acl_recombination_pos = 0; 550 return; 551 } 552 553 // append fragment payload (header already stored) 554 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE + conn->acl_recombination_pos], &packet[4], acl_length ); 555 conn->acl_recombination_pos += acl_length; 556 557 // log_error( "ACL Cont Fragment: acl_len %u, combined_len %u, l2cap_len %u", acl_length, 558 // conn->acl_recombination_pos, conn->acl_recombination_length); 559 560 // forward complete L2CAP packet if complete. 561 if (conn->acl_recombination_pos >= conn->acl_recombination_length + 4 + 4){ // pos already incl. ACL header 562 563 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, &conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], conn->acl_recombination_pos); 564 // reset recombination buffer 565 conn->acl_recombination_length = 0; 566 conn->acl_recombination_pos = 0; 567 } 568 break; 569 570 case 0x02: { // first fragment 571 572 // sanity check 573 if (conn->acl_recombination_pos) { 574 log_error( "ACL First Fragment but data in buffer for handle 0x%02x, dropping stale fragments", con_handle); 575 conn->acl_recombination_pos = 0; 576 } 577 578 // peek into L2CAP packet! 579 uint16_t l2cap_length = READ_L2CAP_LENGTH( packet ); 580 581 // log_info( "ACL First Fragment: acl_len %u, l2cap_len %u", acl_length, l2cap_length); 582 583 // compare fragment size to L2CAP packet size 584 if (acl_length >= l2cap_length + 4){ 585 586 // forward fragment as L2CAP packet 587 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, packet, acl_length + 4); 588 589 } else { 590 591 if (acl_length > HCI_ACL_BUFFER_SIZE){ 592 log_error( "ACL First Fragment to large: fragment %u > buffer size %u for handle 0x%02x", 593 4 + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle); 594 return; 595 } 596 597 // store first fragment and tweak acl length for complete package 598 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], packet, acl_length + 4); 599 conn->acl_recombination_pos = acl_length + 4; 600 conn->acl_recombination_length = l2cap_length; 601 bt_store_16(conn->acl_recombination_buffer, HCI_INCOMING_PRE_BUFFER_SIZE + 2, l2cap_length +4); 602 } 603 break; 604 605 } 606 default: 607 log_error( "hci.c: acl_handler called with invalid packet boundary flags %u", acl_flags & 0x03); 608 return; 609 } 610 611 // execute main loop 612 hci_run(); 613 } 614 615 static void hci_shutdown_connection(hci_connection_t *conn){ 616 log_info("Connection closed: handle 0x%x, %s", conn->con_handle, bd_addr_to_str(conn->address)); 617 618 run_loop_remove_timer(&conn->timeout); 619 620 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 621 btstack_memory_hci_connection_free( conn ); 622 623 // now it's gone 624 hci_emit_nr_connections_changed(); 625 } 626 627 static const uint16_t packet_type_sizes[] = { 628 0, HCI_ACL_2DH1_SIZE, HCI_ACL_3DH1_SIZE, HCI_ACL_DM1_SIZE, 629 HCI_ACL_DH1_SIZE, 0, 0, 0, 630 HCI_ACL_2DH3_SIZE, HCI_ACL_3DH3_SIZE, HCI_ACL_DM3_SIZE, HCI_ACL_DH3_SIZE, 631 HCI_ACL_2DH5_SIZE, HCI_ACL_3DH5_SIZE, HCI_ACL_DM5_SIZE, HCI_ACL_DH5_SIZE 632 }; 633 static const uint8_t packet_type_feature_requirement_bit[] = { 634 0, // 3 slot packets 635 1, // 5 slot packets 636 25, // EDR 2 mpbs 637 26, // EDR 3 mbps 638 39, // 3 slot EDR packts 639 40, // 5 slot EDR packet 640 }; 641 static const uint16_t packet_type_feature_packet_mask[] = { 642 0x0f00, // 3 slot packets 643 0xf000, // 5 slot packets 644 0x1102, // EDR 2 mpbs 645 0x2204, // EDR 3 mbps 646 0x0300, // 3 slot EDR packts 647 0x3000, // 5 slot EDR packet 648 }; 649 650 static uint16_t hci_acl_packet_types_for_buffer_size_and_local_features(uint16_t buffer_size, uint8_t * local_supported_features){ 651 // enable packet types based on size 652 uint16_t packet_types = 0; 653 unsigned int i; 654 for (i=0;i<16;i++){ 655 if (packet_type_sizes[i] == 0) continue; 656 if (packet_type_sizes[i] <= buffer_size){ 657 packet_types |= 1 << i; 658 } 659 } 660 // disable packet types due to missing local supported features 661 for (i=0;i<sizeof(packet_type_feature_requirement_bit);i++){ 662 int bit_idx = packet_type_feature_requirement_bit[i]; 663 int feature_set = (local_supported_features[bit_idx >> 3] & (1<<(bit_idx & 7))) != 0; 664 if (feature_set) continue; 665 log_info("Features bit %02u is not set, removing packet types 0x%04x", bit_idx, packet_type_feature_packet_mask[i]); 666 packet_types &= ~packet_type_feature_packet_mask[i]; 667 } 668 // flip bits for "may not be used" 669 packet_types ^= 0x3306; 670 return packet_types; 671 } 672 673 uint16_t hci_usable_acl_packet_types(void){ 674 return hci_stack->packet_types; 675 } 676 677 uint8_t* hci_get_outgoing_packet_buffer(void){ 678 // hci packet buffer is >= acl data packet length 679 return hci_stack->hci_packet_buffer; 680 } 681 682 uint16_t hci_max_acl_data_packet_length(void){ 683 return hci_stack->acl_data_packet_length; 684 } 685 686 int hci_non_flushable_packet_boundary_flag_supported(void){ 687 // No. 54, byte 6, bit 6 688 return (hci_stack->local_supported_features[6] & (1 << 6)) != 0; 689 } 690 691 int hci_ssp_supported(void){ 692 // No. 51, byte 6, bit 3 693 return (hci_stack->local_supported_features[6] & (1 << 3)) != 0; 694 } 695 696 int hci_classic_supported(void){ 697 // No. 37, byte 4, bit 5, = No BR/EDR Support 698 return (hci_stack->local_supported_features[4] & (1 << 5)) == 0; 699 } 700 701 int hci_le_supported(void){ 702 #ifdef HAVE_BLE 703 // No. 37, byte 4, bit 6 = LE Supported (Controller) 704 return (hci_stack->local_supported_features[4] & (1 << 6)) != 0; 705 #else 706 return 0; 707 #endif 708 } 709 710 // get addr type and address used in advertisement packets 711 void hci_le_advertisement_address(uint8_t * addr_type, bd_addr_t * addr){ 712 *addr_type = hci_stack->adv_addr_type; 713 if (hci_stack->adv_addr_type){ 714 memcpy(addr, hci_stack->adv_address, 6); 715 } else { 716 memcpy(addr, hci_stack->local_bd_addr, 6); 717 } 718 } 719 720 #ifdef HAVE_BLE 721 void le_handle_advertisement_report(uint8_t *packet, int size){ 722 int offset = 3; 723 int num_reports = packet[offset]; 724 offset += 1; 725 726 int i; 727 log_info("HCI: handle adv report with num reports: %d", num_reports); 728 uint8_t event[2 + LE_ADVERTISING_DATA_SIZE]; // use upper bound to avoid var size automatic var 729 for (i=0; i<num_reports;i++){ 730 uint8_t data_length = packet[offset + 8]; 731 uint8_t event_size = 10 + data_length; 732 int pos = 0; 733 event[pos++] = GAP_LE_ADVERTISING_REPORT; 734 event[pos++] = event_size; 735 memcpy(&event[pos], &packet[offset], 1+1+6); // event type + address type + address 736 offset += 8; 737 pos += 8; 738 event[pos++] = packet[offset + 1 + data_length]; // rssi 739 event[pos++] = packet[offset++]; //data_length; 740 memcpy(&event[pos], &packet[offset], data_length); 741 pos += data_length; 742 offset += data_length + 1; // rssi 743 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 744 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 745 } 746 } 747 #endif 748 749 static void hci_initializing_event_handler(uint8_t * packet, uint16_t size){ 750 uint8_t command_completed = 0; 751 if ((hci_stack->substate % 2) == 0) return; 752 // odd: waiting for event 753 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 754 uint16_t opcode = READ_BT_16(packet,3); 755 if (opcode == hci_stack->last_cmd_opcode){ 756 command_completed = 1; 757 log_info("Command complete for expected opcode %04x -> new substate %u", opcode, hci_stack->substate >> 1); 758 } else { 759 log_info("Command complete for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 760 } 761 } 762 if (packet[0] == HCI_EVENT_COMMAND_STATUS){ 763 uint8_t status = packet[2]; 764 uint16_t opcode = READ_BT_16(packet,4); 765 if (opcode == hci_stack->last_cmd_opcode){ 766 if (status){ 767 command_completed = 1; 768 log_error("Command status error 0x%02x for expected opcode %04x -> new substate %u", status, opcode, hci_stack->substate >> 1); 769 } else { 770 log_info("Command status OK for expected opcode %04x, waiting for command complete", opcode); 771 } 772 } else { 773 log_info("Command status for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 774 } 775 } 776 777 if (!command_completed) return; 778 779 switch(hci_stack->substate >> 1){ 780 default: 781 hci_stack->substate++; 782 break; 783 } 784 } 785 786 static void hci_initializing_state_machine(){ 787 if (hci_stack->substate % 2) { 788 // odd: waiting for command completion 789 return; 790 } 791 // log_info("hci_init: substate %u", hci_stack->substate >> 1); 792 switch (hci_stack->substate >> 1){ 793 case 0: // RESET 794 hci_state_reset(); 795 796 hci_send_cmd(&hci_reset); 797 if (hci_stack->config == NULL || ((hci_uart_config_t *)hci_stack->config)->baudrate_main == 0){ 798 // skip baud change 799 hci_stack->substate = 2 << 1; 800 } 801 break; 802 case 1: // SEND BAUD CHANGE 803 hci_stack->control->baudrate_cmd(hci_stack->config, ((hci_uart_config_t *)hci_stack->config)->baudrate_main, hci_stack->hci_packet_buffer); 804 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 805 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 806 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 807 break; 808 case 2: // LOCAL BAUD CHANGE 809 log_info("Local baud rate change"); 810 hci_stack->hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack->config)->baudrate_main); 811 hci_stack->substate += 2; 812 // break missing here for fall through 813 814 case 3: // SET BD ADDR 815 if ( hci_stack->custom_bd_addr_set && hci_stack->control && hci_stack->control->set_bd_addr_cmd){ 816 log_info("Set Public BD ADDR to %s", bd_addr_to_str(hci_stack->custom_bd_addr)); 817 hci_stack->control->set_bd_addr_cmd(hci_stack->config, hci_stack->custom_bd_addr, hci_stack->hci_packet_buffer); 818 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 819 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 820 break; 821 } 822 hci_stack->substate += 2; 823 // break missing here for fall through 824 825 case 4: 826 log_info("Custom init"); 827 // Custom initialization 828 if (hci_stack->control && hci_stack->control->next_cmd){ 829 int valid_cmd = (*hci_stack->control->next_cmd)(hci_stack->config, hci_stack->hci_packet_buffer); 830 if (valid_cmd){ 831 int size = 3 + hci_stack->hci_packet_buffer[2]; 832 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 833 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, hci_stack->hci_packet_buffer, size); 834 hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack->hci_packet_buffer, size); 835 hci_stack->substate = 3 << 1; // more init commands 836 break; 837 } 838 log_info("hci_run: init script done"); 839 } 840 // otherwise continue 841 hci_send_cmd(&hci_read_bd_addr); 842 break; 843 case 5: 844 hci_send_cmd(&hci_read_buffer_size); 845 break; 846 case 6: 847 hci_send_cmd(&hci_read_local_supported_features); 848 break; 849 case 7: 850 if (hci_le_supported()){ 851 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 852 } else { 853 // Kensington Bluetooth 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 854 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 855 } 856 857 // skip Classic init commands for LE only chipsets 858 if (!hci_classic_supported()){ 859 if (hci_le_supported()){ 860 hci_stack->substate = 12 << 1; // skip all classic command 861 } else { 862 log_error("Neither BR/EDR nor LE supported"); 863 hci_stack->substate = 15 << 1; // skip all 864 } 865 } 866 break; 867 case 8: 868 if (hci_ssp_supported()){ 869 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack->ssp_enable); 870 break; 871 } 872 hci_stack->substate += 2; 873 // break missing here for fall through 874 875 case 9: 876 // ca. 15 sec 877 hci_send_cmd(&hci_write_page_timeout, 0x6000); 878 break; 879 case 10: 880 hci_send_cmd(&hci_write_class_of_device, hci_stack->class_of_device); 881 break; 882 case 11: 883 if (hci_stack->local_name){ 884 hci_send_cmd(&hci_write_local_name, hci_stack->local_name); 885 } else { 886 char hostname[30]; 887 #ifdef EMBEDDED 888 // BTstack-11:22:33:44:55:66 889 strcpy(hostname, "BTstack "); 890 strcat(hostname, bd_addr_to_str(hci_stack->local_bd_addr)); 891 log_info("---> Name %s", hostname); 892 #else 893 // hostname for POSIX systems 894 gethostname(hostname, 30); 895 hostname[29] = '\0'; 896 #endif 897 hci_send_cmd(&hci_write_local_name, hostname); 898 } 899 break; 900 case 12: 901 hci_send_cmd(&hci_write_scan_enable, (hci_stack->connectable << 1) | hci_stack->discoverable); // page scan 902 if (!hci_le_supported()){ 903 // SKIP LE init for Classic only configuration 904 hci_stack->substate = 15 << 1; 905 } 906 break; 907 908 #ifdef HAVE_BLE 909 // LE INIT 910 case 13: 911 hci_send_cmd(&hci_le_read_buffer_size); 912 break; 913 case 14: 914 // LE Supported Host = 1, Simultaneous Host = 0 915 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 916 break; 917 case 15: 918 // LE Scan Parameters: active scanning, 300 ms interval, 30 ms window, public address, accept all advs 919 hci_send_cmd(&hci_le_set_scan_parameters, 1, 0x1e0, 0x30, 0, 0); 920 break; 921 #endif 922 923 // DONE 924 case 16: 925 // done. 926 hci_stack->state = HCI_STATE_WORKING; 927 hci_emit_state(); 928 break; 929 default: 930 break; 931 } 932 hci_stack->substate++; 933 } 934 935 // avoid huge local variables 936 #ifndef EMBEDDED 937 static device_name_t device_name; 938 #endif 939 static void event_handler(uint8_t *packet, int size){ 940 941 uint16_t event_length = packet[1]; 942 943 // assert packet is complete 944 if (size != event_length + 2){ 945 log_error("hci.c: event_handler called with event packet of wrong size %u, expected %u => dropping packet", size, event_length + 2); 946 return; 947 } 948 949 bd_addr_t addr; 950 bd_addr_type_t addr_type; 951 uint8_t link_type; 952 hci_con_handle_t handle; 953 hci_connection_t * conn; 954 int i; 955 956 // log_info("HCI:EVENT:%02x", packet[0]); 957 958 switch (packet[0]) { 959 960 case HCI_EVENT_COMMAND_COMPLETE: 961 // get num cmd packets 962 // log_info("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u", hci_stack->num_cmd_packets, packet[2]); 963 hci_stack->num_cmd_packets = packet[2]; 964 965 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 966 // from offset 5 967 // status 968 // "The HC_ACL_Data_Packet_Length return parameter will be used to determine the size of the L2CAP segments contained in ACL Data Packets" 969 hci_stack->acl_data_packet_length = READ_BT_16(packet, 6); 970 // ignore: SCO data packet len (8) 971 hci_stack->acl_packets_total_num = packet[9]; 972 // ignore: total num SCO packets 973 if (hci_stack->state == HCI_STATE_INITIALIZING){ 974 // determine usable ACL payload size 975 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->acl_data_packet_length){ 976 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 977 } 978 log_info("hci_read_buffer_size: used size %u, count %u", 979 hci_stack->acl_data_packet_length, hci_stack->acl_packets_total_num); 980 } 981 } 982 #ifdef HAVE_BLE 983 if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_buffer_size)){ 984 hci_stack->le_data_packets_length = READ_BT_16(packet, 6); 985 hci_stack->le_acl_packets_total_num = packet[8]; 986 // determine usable ACL payload size 987 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->le_data_packets_length){ 988 hci_stack->le_data_packets_length = HCI_ACL_PAYLOAD_SIZE; 989 } 990 log_info("hci_le_read_buffer_size: size %u, count %u", hci_stack->le_data_packets_length, hci_stack->le_acl_packets_total_num); 991 } 992 #endif 993 // Dump local address 994 if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)) { 995 bt_flip_addr(hci_stack->local_bd_addr, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1]); 996 log_info("Local Address, Status: 0x%02x: Addr: %s", 997 packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE], bd_addr_to_str(hci_stack->local_bd_addr)); 998 } 999 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1000 hci_emit_discoverable_enabled(hci_stack->discoverable); 1001 } 1002 // Note: HCI init checks 1003 if (COMMAND_COMPLETE_EVENT(packet, hci_read_local_supported_features)){ 1004 memcpy(hci_stack->local_supported_features, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1], 8); 1005 log_info("Local Supported Features: 0x%02x%02x%02x%02x%02x%02x%02x%02x", 1006 hci_stack->local_supported_features[0], hci_stack->local_supported_features[1], 1007 hci_stack->local_supported_features[2], hci_stack->local_supported_features[3], 1008 hci_stack->local_supported_features[4], hci_stack->local_supported_features[5], 1009 hci_stack->local_supported_features[6], hci_stack->local_supported_features[7]); 1010 1011 // determine usable ACL packet types based on host buffer size and supported features 1012 hci_stack->packet_types = hci_acl_packet_types_for_buffer_size_and_local_features(HCI_ACL_PAYLOAD_SIZE, &hci_stack->local_supported_features[0]); 1013 log_info("packet types %04x", hci_stack->packet_types); 1014 1015 // Classic/LE 1016 log_info("BR/EDR support %u, LE support %u", hci_classic_supported(), hci_le_supported()); 1017 } 1018 break; 1019 1020 case HCI_EVENT_COMMAND_STATUS: 1021 // get num cmd packets 1022 // log_info("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u", hci_stack->num_cmd_packets, packet[3]); 1023 hci_stack->num_cmd_packets = packet[3]; 1024 break; 1025 1026 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:{ 1027 int offset = 3; 1028 for (i=0; i<packet[2];i++){ 1029 handle = READ_BT_16(packet, offset); 1030 offset += 2; 1031 uint16_t num_packets = READ_BT_16(packet, offset); 1032 offset += 2; 1033 1034 conn = hci_connection_for_handle(handle); 1035 if (!conn){ 1036 log_error("hci_number_completed_packet lists unused con handle %u", handle); 1037 continue; 1038 } 1039 1040 if (conn->num_acl_packets_sent >= num_packets){ 1041 conn->num_acl_packets_sent -= num_packets; 1042 } else { 1043 log_error("hci_number_completed_packets, more slots freed then sent."); 1044 conn->num_acl_packets_sent = 0; 1045 } 1046 // log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u", num_packets, handle, conn->num_acl_packets_sent); 1047 } 1048 break; 1049 } 1050 case HCI_EVENT_CONNECTION_REQUEST: 1051 bt_flip_addr(addr, &packet[2]); 1052 // TODO: eval COD 8-10 1053 link_type = packet[11]; 1054 log_info("Connection_incoming: %s, type %u", bd_addr_to_str(addr), link_type); 1055 if (link_type == 1) { // ACL 1056 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1057 if (!conn) { 1058 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 1059 } 1060 if (!conn) { 1061 // CONNECTION REJECTED DUE TO LIMITED RESOURCES (0X0D) 1062 hci_stack->decline_reason = 0x0d; 1063 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1064 break; 1065 } 1066 conn->state = RECEIVED_CONNECTION_REQUEST; 1067 hci_run(); 1068 } else { 1069 // SYNCHRONOUS CONNECTION LIMIT TO A DEVICE EXCEEDED (0X0A) 1070 hci_stack->decline_reason = 0x0a; 1071 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1072 } 1073 break; 1074 1075 case HCI_EVENT_CONNECTION_COMPLETE: 1076 // Connection management 1077 bt_flip_addr(addr, &packet[5]); 1078 log_info("Connection_complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 1079 addr_type = BD_ADDR_TYPE_CLASSIC; 1080 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1081 if (conn) { 1082 if (!packet[2]){ 1083 conn->state = OPEN; 1084 conn->con_handle = READ_BT_16(packet, 3); 1085 conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES; 1086 1087 // restart timer 1088 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1089 run_loop_add_timer(&conn->timeout); 1090 1091 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1092 1093 hci_emit_nr_connections_changed(); 1094 } else { 1095 int notify_dedicated_bonding_failed = conn->bonding_flags & BONDING_DEDICATED; 1096 uint8_t status = packet[2]; 1097 bd_addr_t bd_address; 1098 memcpy(&bd_address, conn->address, 6); 1099 1100 // connection failed, remove entry 1101 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1102 btstack_memory_hci_connection_free( conn ); 1103 1104 // notify client if dedicated bonding 1105 if (notify_dedicated_bonding_failed){ 1106 log_info("hci notify_dedicated_bonding_failed"); 1107 hci_emit_dedicated_bonding_result(bd_address, status); 1108 } 1109 1110 // if authentication error, also delete link key 1111 if (packet[2] == 0x05) { 1112 hci_drop_link_key_for_bd_addr(&addr); 1113 } 1114 } 1115 } 1116 break; 1117 1118 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 1119 handle = READ_BT_16(packet, 3); 1120 conn = hci_connection_for_handle(handle); 1121 if (!conn) break; 1122 if (!packet[2]){ 1123 uint8_t * features = &packet[5]; 1124 if (features[6] & (1 << 3)){ 1125 conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP; 1126 } 1127 } 1128 conn->bonding_flags |= BONDING_RECEIVED_REMOTE_FEATURES; 1129 log_info("HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE, bonding flags %x", conn->bonding_flags); 1130 if (conn->bonding_flags & BONDING_DEDICATED){ 1131 conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 1132 } 1133 break; 1134 1135 case HCI_EVENT_LINK_KEY_REQUEST: 1136 log_info("HCI_EVENT_LINK_KEY_REQUEST"); 1137 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 1138 // non-bondable mode: link key negative reply will be sent by HANDLE_LINK_KEY_REQUEST 1139 if (hci_stack->bondable && !hci_stack->remote_device_db) break; 1140 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], HANDLE_LINK_KEY_REQUEST); 1141 hci_run(); 1142 // request handled by hci_run() as HANDLE_LINK_KEY_REQUEST gets set 1143 return; 1144 1145 case HCI_EVENT_LINK_KEY_NOTIFICATION: { 1146 bt_flip_addr(addr, &packet[2]); 1147 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1148 if (!conn) break; 1149 conn->authentication_flags |= RECV_LINK_KEY_NOTIFICATION; 1150 link_key_type_t link_key_type = (link_key_type_t)packet[24]; 1151 // Change Connection Encryption keeps link key type 1152 if (link_key_type != CHANGED_COMBINATION_KEY){ 1153 conn->link_key_type = link_key_type; 1154 } 1155 if (!hci_stack->remote_device_db) break; 1156 hci_stack->remote_device_db->put_link_key(&addr, (link_key_t *) &packet[8], conn->link_key_type); 1157 // still forward event to allow dismiss of pairing dialog 1158 break; 1159 } 1160 1161 case HCI_EVENT_PIN_CODE_REQUEST: 1162 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], LEGACY_PAIRING_ACTIVE); 1163 // non-bondable mode: pin code negative reply will be sent 1164 if (!hci_stack->bondable){ 1165 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], DENY_PIN_CODE_REQUEST); 1166 hci_run(); 1167 return; 1168 } 1169 // PIN CODE REQUEST means the link key request didn't succee -> delete stored link key 1170 if (!hci_stack->remote_device_db) break; 1171 bt_flip_addr(addr, &packet[2]); 1172 hci_stack->remote_device_db->delete_link_key(&addr); 1173 break; 1174 1175 case HCI_EVENT_IO_CAPABILITY_REQUEST: 1176 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_IO_CAPABILITIES_REQUEST); 1177 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_IO_CAPABILITIES_REPLY); 1178 break; 1179 1180 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 1181 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1182 if (!hci_stack->ssp_auto_accept) break; 1183 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_CONFIRM_REPLY); 1184 break; 1185 1186 case HCI_EVENT_USER_PASSKEY_REQUEST: 1187 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1188 if (!hci_stack->ssp_auto_accept) break; 1189 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_PASSKEY_REPLY); 1190 break; 1191 1192 case HCI_EVENT_ENCRYPTION_CHANGE: 1193 handle = READ_BT_16(packet, 3); 1194 conn = hci_connection_for_handle(handle); 1195 if (!conn) break; 1196 if (packet[2] == 0) { 1197 if (packet[5]){ 1198 conn->authentication_flags |= CONNECTION_ENCRYPTED; 1199 } else { 1200 conn->authentication_flags &= ~CONNECTION_ENCRYPTED; 1201 } 1202 } 1203 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1204 break; 1205 1206 case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT: 1207 handle = READ_BT_16(packet, 3); 1208 conn = hci_connection_for_handle(handle); 1209 if (!conn) break; 1210 1211 // dedicated bonding: send result and disconnect 1212 if (conn->bonding_flags & BONDING_DEDICATED){ 1213 conn->bonding_flags &= ~BONDING_DEDICATED; 1214 conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE; 1215 conn->bonding_status = packet[2]; 1216 break; 1217 } 1218 1219 if (packet[2] == 0 && gap_security_level_for_link_key_type(conn->link_key_type) >= conn->requested_security_level){ 1220 // link key sufficient for requested security 1221 conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 1222 break; 1223 } 1224 // not enough 1225 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1226 break; 1227 1228 #ifndef EMBEDDED 1229 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 1230 if (!hci_stack->remote_device_db) break; 1231 if (packet[2]) break; // status not ok 1232 bt_flip_addr(addr, &packet[3]); 1233 // fix for invalid remote names - terminate on 0xff 1234 for (i=0; i<248;i++){ 1235 if (packet[9+i] == 0xff){ 1236 packet[9+i] = 0; 1237 break; 1238 } 1239 } 1240 memset(&device_name, 0, sizeof(device_name_t)); 1241 strncpy((char*) device_name, (char*) &packet[9], 248); 1242 hci_stack->remote_device_db->put_name(&addr, &device_name); 1243 break; 1244 1245 case HCI_EVENT_INQUIRY_RESULT: 1246 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:{ 1247 if (!hci_stack->remote_device_db) break; 1248 // first send inq result packet 1249 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1250 // then send cached remote names 1251 int offset = 3; 1252 for (i=0; i<packet[2];i++){ 1253 bt_flip_addr(addr, &packet[offset]); 1254 offset += 14; // 6 + 1 + 1 + 1 + 3 + 2; 1255 if (hci_stack->remote_device_db->get_name(&addr, &device_name)){ 1256 hci_emit_remote_name_cached(&addr, &device_name); 1257 } 1258 } 1259 return; 1260 } 1261 #endif 1262 1263 // HCI_EVENT_DISCONNECTION_COMPLETE 1264 // has been split, to first notify stack before shutting connection down 1265 // see end of function, too. 1266 case HCI_EVENT_DISCONNECTION_COMPLETE: 1267 if (packet[2]) break; // status != 0 1268 handle = READ_BT_16(packet, 3); 1269 hci_connection_t * conn = hci_connection_for_handle(handle); 1270 if (!conn) break; // no conn struct anymore 1271 conn->state = RECEIVED_DISCONNECTION_COMPLETE; 1272 break; 1273 1274 case HCI_EVENT_HARDWARE_ERROR: 1275 if(hci_stack->control && hci_stack->control->hw_error){ 1276 (*hci_stack->control->hw_error)(); 1277 } else { 1278 // if no special requests, just reboot stack 1279 hci_power_control_off(); 1280 hci_power_control_on(); 1281 } 1282 break; 1283 1284 case DAEMON_EVENT_HCI_PACKET_SENT: 1285 // release packet buffer only for asynchronous transport and if there are not further fragements 1286 if (hci_transport_synchronous()) { 1287 log_error("Synchronous HCI Transport shouldn't send DAEMON_EVENT_HCI_PACKET_SENT"); 1288 return; // instead of break: to avoid re-entering hci_run() 1289 } 1290 if (hci_stack->acl_fragmentation_total_size) break; 1291 hci_release_packet_buffer(); 1292 break; 1293 1294 #ifdef HAVE_BLE 1295 case HCI_EVENT_LE_META: 1296 switch (packet[2]){ 1297 case HCI_SUBEVENT_LE_ADVERTISING_REPORT: 1298 log_info("advertising report received"); 1299 if (hci_stack->le_scanning_state != LE_SCANNING) break; 1300 le_handle_advertisement_report(packet, size); 1301 break; 1302 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 1303 // Connection management 1304 bt_flip_addr(addr, &packet[8]); 1305 addr_type = (bd_addr_type_t)packet[7]; 1306 log_info("LE Connection_complete (status=%u) type %u, %s", packet[3], addr_type, bd_addr_to_str(addr)); 1307 // LE connections are auto-accepted, so just create a connection if there isn't one already 1308 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1309 if (packet[3]){ 1310 if (conn){ 1311 // outgoing connection failed, remove entry 1312 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1313 btstack_memory_hci_connection_free( conn ); 1314 } 1315 // if authentication error, also delete link key 1316 if (packet[3] == 0x05) { 1317 hci_drop_link_key_for_bd_addr(&addr); 1318 } 1319 break; 1320 } 1321 if (!conn){ 1322 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 1323 } 1324 if (!conn){ 1325 // no memory 1326 break; 1327 } 1328 1329 conn->state = OPEN; 1330 conn->con_handle = READ_BT_16(packet, 4); 1331 1332 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 1333 1334 // restart timer 1335 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1336 // run_loop_add_timer(&conn->timeout); 1337 1338 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1339 1340 hci_emit_nr_connections_changed(); 1341 break; 1342 1343 // log_info("LE buffer size: %u, count %u", READ_BT_16(packet,6), packet[8]); 1344 1345 default: 1346 break; 1347 } 1348 break; 1349 #endif 1350 default: 1351 break; 1352 } 1353 1354 // handle BT initialization 1355 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1356 hci_initializing_event_handler(packet, size); 1357 } 1358 1359 // help with BT sleep 1360 if (hci_stack->state == HCI_STATE_FALLING_ASLEEP 1361 && hci_stack->substate == 1 1362 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1363 hci_stack->substate++; 1364 } 1365 1366 // notify upper stack 1367 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1368 1369 // moved here to give upper stack a chance to close down everything with hci_connection_t intact 1370 if (packet[0] == HCI_EVENT_DISCONNECTION_COMPLETE){ 1371 if (!packet[2]){ 1372 handle = READ_BT_16(packet, 3); 1373 hci_connection_t * conn = hci_connection_for_handle(handle); 1374 if (conn) { 1375 uint8_t status = conn->bonding_status; 1376 uint16_t flags = conn->bonding_flags; 1377 bd_addr_t bd_address; 1378 memcpy(&bd_address, conn->address, 6); 1379 hci_shutdown_connection(conn); 1380 // connection struct is gone, don't access anymore 1381 if (flags & BONDING_EMIT_COMPLETE_ON_DISCONNECT){ 1382 hci_emit_dedicated_bonding_result(bd_address, status); 1383 } 1384 } 1385 } 1386 } 1387 1388 // execute main loop 1389 hci_run(); 1390 } 1391 1392 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1393 hci_dump_packet(packet_type, 1, packet, size); 1394 switch (packet_type) { 1395 case HCI_EVENT_PACKET: 1396 event_handler(packet, size); 1397 break; 1398 case HCI_ACL_DATA_PACKET: 1399 acl_handler(packet, size); 1400 break; 1401 default: 1402 break; 1403 } 1404 } 1405 1406 /** Register HCI packet handlers */ 1407 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 1408 hci_stack->packet_handler = handler; 1409 } 1410 1411 static void hci_state_reset(){ 1412 // no connections yet 1413 hci_stack->connections = NULL; 1414 1415 // keep discoverable/connectable as this has been requested by the client(s) 1416 // hci_stack->discoverable = 0; 1417 // hci_stack->connectable = 0; 1418 // hci_stack->bondable = 1; 1419 1420 // buffer is free 1421 hci_stack->hci_packet_buffer_reserved = 0; 1422 1423 // no pending cmds 1424 hci_stack->decline_reason = 0; 1425 hci_stack->new_scan_enable_value = 0xff; 1426 1427 // LE 1428 hci_stack->adv_addr_type = 0; 1429 memset(hci_stack->adv_address, 0, 6); 1430 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1431 hci_stack->le_scan_type = 0xff; 1432 hci_stack->le_connection_parameter_range.le_conn_interval_min = 0x0006; 1433 hci_stack->le_connection_parameter_range.le_conn_interval_max = 0x0C80; 1434 hci_stack->le_connection_parameter_range.le_conn_latency_min = 0x0000; 1435 hci_stack->le_connection_parameter_range.le_conn_latency_max = 0x03E8; 1436 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = 0x000A; 1437 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = 0x0C80; 1438 } 1439 1440 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 1441 1442 #ifdef HAVE_MALLOC 1443 if (!hci_stack) { 1444 hci_stack = (hci_stack_t*) malloc(sizeof(hci_stack_t)); 1445 } 1446 #else 1447 hci_stack = &hci_stack_static; 1448 #endif 1449 memset(hci_stack, 0, sizeof(hci_stack_t)); 1450 1451 // reference to use transport layer implementation 1452 hci_stack->hci_transport = transport; 1453 1454 // references to used control implementation 1455 hci_stack->control = control; 1456 1457 // reference to used config 1458 hci_stack->config = config; 1459 1460 // higher level handler 1461 hci_stack->packet_handler = dummy_handler; 1462 1463 // store and open remote device db 1464 hci_stack->remote_device_db = remote_device_db; 1465 if (hci_stack->remote_device_db) { 1466 hci_stack->remote_device_db->open(); 1467 } 1468 1469 // max acl payload size defined in config.h 1470 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1471 1472 // register packet handlers with transport 1473 transport->register_packet_handler(&packet_handler); 1474 1475 hci_stack->state = HCI_STATE_OFF; 1476 1477 // class of device 1478 hci_stack->class_of_device = 0x007a020c; // Smartphone 1479 1480 // bondable by default 1481 hci_stack->bondable = 1; 1482 1483 // Secure Simple Pairing default: enable, no I/O capabilities, general bonding, mitm not required, auto accept 1484 hci_stack->ssp_enable = 1; 1485 hci_stack->ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 1486 hci_stack->ssp_authentication_requirement = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING; 1487 hci_stack->ssp_auto_accept = 1; 1488 1489 hci_state_reset(); 1490 } 1491 1492 void hci_close(){ 1493 // close remote device db 1494 if (hci_stack->remote_device_db) { 1495 hci_stack->remote_device_db->close(); 1496 } 1497 while (hci_stack->connections) { 1498 // cancel all l2cap connections 1499 hci_emit_disconnection_complete(((hci_connection_t *) hci_stack->connections)->con_handle, 0x16); // terminated by local host 1500 hci_shutdown_connection((hci_connection_t *) hci_stack->connections); 1501 } 1502 hci_power_control(HCI_POWER_OFF); 1503 1504 #ifdef HAVE_MALLOC 1505 free(hci_stack); 1506 #endif 1507 hci_stack = NULL; 1508 } 1509 1510 void hci_set_class_of_device(uint32_t class_of_device){ 1511 hci_stack->class_of_device = class_of_device; 1512 } 1513 1514 // Set Public BD ADDR - passed on to Bluetooth chipset if supported in bt_control_h 1515 void hci_set_bd_addr(bd_addr_t addr){ 1516 memcpy(hci_stack->custom_bd_addr, addr, 6); 1517 hci_stack->custom_bd_addr_set = 1; 1518 } 1519 1520 void hci_disable_l2cap_timeout_check(){ 1521 disable_l2cap_timeouts = 1; 1522 } 1523 // State-Module-Driver overview 1524 // state module low-level 1525 // HCI_STATE_OFF off close 1526 // HCI_STATE_INITIALIZING, on open 1527 // HCI_STATE_WORKING, on open 1528 // HCI_STATE_HALTING, on open 1529 // HCI_STATE_SLEEPING, off/sleep close 1530 // HCI_STATE_FALLING_ASLEEP on open 1531 1532 static int hci_power_control_on(void){ 1533 1534 // power on 1535 int err = 0; 1536 if (hci_stack->control && hci_stack->control->on){ 1537 err = (*hci_stack->control->on)(hci_stack->config); 1538 } 1539 if (err){ 1540 log_error( "POWER_ON failed"); 1541 hci_emit_hci_open_failed(); 1542 return err; 1543 } 1544 1545 // open low-level device 1546 err = hci_stack->hci_transport->open(hci_stack->config); 1547 if (err){ 1548 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1549 if (hci_stack->control && hci_stack->control->off){ 1550 (*hci_stack->control->off)(hci_stack->config); 1551 } 1552 hci_emit_hci_open_failed(); 1553 return err; 1554 } 1555 return 0; 1556 } 1557 1558 static void hci_power_control_off(void){ 1559 1560 log_info("hci_power_control_off"); 1561 1562 // close low-level device 1563 hci_stack->hci_transport->close(hci_stack->config); 1564 1565 log_info("hci_power_control_off - hci_transport closed"); 1566 1567 // power off 1568 if (hci_stack->control && hci_stack->control->off){ 1569 (*hci_stack->control->off)(hci_stack->config); 1570 } 1571 1572 log_info("hci_power_control_off - control closed"); 1573 1574 hci_stack->state = HCI_STATE_OFF; 1575 } 1576 1577 static void hci_power_control_sleep(void){ 1578 1579 log_info("hci_power_control_sleep"); 1580 1581 #if 0 1582 // don't close serial port during sleep 1583 1584 // close low-level device 1585 hci_stack->hci_transport->close(hci_stack->config); 1586 #endif 1587 1588 // sleep mode 1589 if (hci_stack->control && hci_stack->control->sleep){ 1590 (*hci_stack->control->sleep)(hci_stack->config); 1591 } 1592 1593 hci_stack->state = HCI_STATE_SLEEPING; 1594 } 1595 1596 static int hci_power_control_wake(void){ 1597 1598 log_info("hci_power_control_wake"); 1599 1600 // wake on 1601 if (hci_stack->control && hci_stack->control->wake){ 1602 (*hci_stack->control->wake)(hci_stack->config); 1603 } 1604 1605 #if 0 1606 // open low-level device 1607 int err = hci_stack->hci_transport->open(hci_stack->config); 1608 if (err){ 1609 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1610 if (hci_stack->control && hci_stack->control->off){ 1611 (*hci_stack->control->off)(hci_stack->config); 1612 } 1613 hci_emit_hci_open_failed(); 1614 return err; 1615 } 1616 #endif 1617 1618 return 0; 1619 } 1620 1621 static void hci_power_transition_to_initializing(void){ 1622 // set up state machine 1623 hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent 1624 hci_stack->hci_packet_buffer_reserved = 0; 1625 hci_stack->state = HCI_STATE_INITIALIZING; 1626 hci_stack->substate = 0; 1627 } 1628 1629 int hci_power_control(HCI_POWER_MODE power_mode){ 1630 1631 log_info("hci_power_control: %u, current mode %u", power_mode, hci_stack->state); 1632 1633 int err = 0; 1634 switch (hci_stack->state){ 1635 1636 case HCI_STATE_OFF: 1637 switch (power_mode){ 1638 case HCI_POWER_ON: 1639 err = hci_power_control_on(); 1640 if (err) { 1641 log_error("hci_power_control_on() error %u", err); 1642 return err; 1643 } 1644 hci_power_transition_to_initializing(); 1645 break; 1646 case HCI_POWER_OFF: 1647 // do nothing 1648 break; 1649 case HCI_POWER_SLEEP: 1650 // do nothing (with SLEEP == OFF) 1651 break; 1652 } 1653 break; 1654 1655 case HCI_STATE_INITIALIZING: 1656 switch (power_mode){ 1657 case HCI_POWER_ON: 1658 // do nothing 1659 break; 1660 case HCI_POWER_OFF: 1661 // no connections yet, just turn it off 1662 hci_power_control_off(); 1663 break; 1664 case HCI_POWER_SLEEP: 1665 // no connections yet, just turn it off 1666 hci_power_control_sleep(); 1667 break; 1668 } 1669 break; 1670 1671 case HCI_STATE_WORKING: 1672 switch (power_mode){ 1673 case HCI_POWER_ON: 1674 // do nothing 1675 break; 1676 case HCI_POWER_OFF: 1677 // see hci_run 1678 hci_stack->state = HCI_STATE_HALTING; 1679 break; 1680 case HCI_POWER_SLEEP: 1681 // see hci_run 1682 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1683 hci_stack->substate = 0; 1684 break; 1685 } 1686 break; 1687 1688 case HCI_STATE_HALTING: 1689 switch (power_mode){ 1690 case HCI_POWER_ON: 1691 hci_power_transition_to_initializing(); 1692 break; 1693 case HCI_POWER_OFF: 1694 // do nothing 1695 break; 1696 case HCI_POWER_SLEEP: 1697 // see hci_run 1698 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1699 hci_stack->substate = 0; 1700 break; 1701 } 1702 break; 1703 1704 case HCI_STATE_FALLING_ASLEEP: 1705 switch (power_mode){ 1706 case HCI_POWER_ON: 1707 1708 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1709 // nothing to do, if H4 supports power management 1710 if (bt_control_iphone_power_management_enabled()){ 1711 hci_stack->state = HCI_STATE_INITIALIZING; 1712 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1713 break; 1714 } 1715 #endif 1716 hci_power_transition_to_initializing(); 1717 break; 1718 case HCI_POWER_OFF: 1719 // see hci_run 1720 hci_stack->state = HCI_STATE_HALTING; 1721 break; 1722 case HCI_POWER_SLEEP: 1723 // do nothing 1724 break; 1725 } 1726 break; 1727 1728 case HCI_STATE_SLEEPING: 1729 switch (power_mode){ 1730 case HCI_POWER_ON: 1731 1732 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1733 // nothing to do, if H4 supports power management 1734 if (bt_control_iphone_power_management_enabled()){ 1735 hci_stack->state = HCI_STATE_INITIALIZING; 1736 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1737 hci_update_scan_enable(); 1738 break; 1739 } 1740 #endif 1741 err = hci_power_control_wake(); 1742 if (err) return err; 1743 hci_power_transition_to_initializing(); 1744 break; 1745 case HCI_POWER_OFF: 1746 hci_stack->state = HCI_STATE_HALTING; 1747 break; 1748 case HCI_POWER_SLEEP: 1749 // do nothing 1750 break; 1751 } 1752 break; 1753 } 1754 1755 // create internal event 1756 hci_emit_state(); 1757 1758 // trigger next/first action 1759 hci_run(); 1760 1761 return 0; 1762 } 1763 1764 static void hci_update_scan_enable(void){ 1765 // 2 = page scan, 1 = inq scan 1766 hci_stack->new_scan_enable_value = hci_stack->connectable << 1 | hci_stack->discoverable; 1767 hci_run(); 1768 } 1769 1770 void hci_discoverable_control(uint8_t enable){ 1771 if (enable) enable = 1; // normalize argument 1772 1773 if (hci_stack->discoverable == enable){ 1774 hci_emit_discoverable_enabled(hci_stack->discoverable); 1775 return; 1776 } 1777 1778 hci_stack->discoverable = enable; 1779 hci_update_scan_enable(); 1780 } 1781 1782 void hci_connectable_control(uint8_t enable){ 1783 if (enable) enable = 1; // normalize argument 1784 1785 // don't emit event 1786 if (hci_stack->connectable == enable) return; 1787 1788 hci_stack->connectable = enable; 1789 hci_update_scan_enable(); 1790 } 1791 1792 bd_addr_t * hci_local_bd_addr(void){ 1793 return &hci_stack->local_bd_addr; 1794 } 1795 1796 void hci_run(){ 1797 1798 hci_connection_t * connection; 1799 linked_item_t * it; 1800 1801 // send continuation fragments first, as they block the prepared packet buffer 1802 if (hci_stack->acl_fragmentation_total_size > 0) { 1803 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(hci_stack->hci_packet_buffer); 1804 if (hci_can_send_prepared_acl_packet_now(con_handle)){ 1805 hci_connection_t *connection = hci_connection_for_handle(con_handle); 1806 if (connection) { 1807 hci_send_acl_packet_fragments(connection); 1808 return; 1809 } 1810 // connection gone -> discard further fragments 1811 hci_stack->acl_fragmentation_total_size = 0; 1812 hci_stack->acl_fragmentation_pos = 0; 1813 } 1814 } 1815 1816 if (!hci_can_send_command_packet_now()) return; 1817 1818 // global/non-connection oriented commands 1819 1820 // decline incoming connections 1821 if (hci_stack->decline_reason){ 1822 uint8_t reason = hci_stack->decline_reason; 1823 hci_stack->decline_reason = 0; 1824 hci_send_cmd(&hci_reject_connection_request, hci_stack->decline_addr, reason); 1825 return; 1826 } 1827 1828 // send scan enable 1829 if (hci_stack->state == HCI_STATE_WORKING && hci_stack->new_scan_enable_value != 0xff && hci_classic_supported()){ 1830 hci_send_cmd(&hci_write_scan_enable, hci_stack->new_scan_enable_value); 1831 hci_stack->new_scan_enable_value = 0xff; 1832 return; 1833 } 1834 1835 #ifdef HAVE_BLE 1836 // handle le scan 1837 if (hci_stack->state == HCI_STATE_WORKING){ 1838 switch(hci_stack->le_scanning_state){ 1839 case LE_START_SCAN: 1840 hci_stack->le_scanning_state = LE_SCANNING; 1841 hci_send_cmd(&hci_le_set_scan_enable, 1, 0); 1842 return; 1843 1844 case LE_STOP_SCAN: 1845 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1846 hci_send_cmd(&hci_le_set_scan_enable, 0, 0); 1847 return; 1848 default: 1849 break; 1850 } 1851 if (hci_stack->le_scan_type != 0xff){ 1852 // defaults: active scanning, accept all advertisement packets 1853 int scan_type = hci_stack->le_scan_type; 1854 hci_stack->le_scan_type = 0xff; 1855 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); 1856 return; 1857 } 1858 } 1859 #endif 1860 1861 // send pending HCI commands 1862 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 1863 connection = (hci_connection_t *) it; 1864 1865 switch(connection->state){ 1866 case SEND_CREATE_CONNECTION: 1867 switch(connection->address_type){ 1868 case BD_ADDR_TYPE_CLASSIC: 1869 log_info("sending hci_create_connection"); 1870 hci_send_cmd(&hci_create_connection, connection->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 1871 break; 1872 default: 1873 #ifdef HAVE_BLE 1874 log_info("sending hci_le_create_connection"); 1875 hci_send_cmd(&hci_le_create_connection, 1876 0x0060, // scan interval: 60 ms 1877 0x0030, // scan interval: 30 ms 1878 0, // don't use whitelist 1879 connection->address_type, // peer address type 1880 connection->address, // peer bd addr 1881 hci_stack->adv_addr_type, // our addr type: 1882 0x0008, // conn interval min 1883 0x0018, // conn interval max 1884 0, // conn latency 1885 0x0048, // supervision timeout 1886 0x0001, // min ce length 1887 0x0001 // max ce length 1888 ); 1889 1890 connection->state = SENT_CREATE_CONNECTION; 1891 #endif 1892 break; 1893 } 1894 return; 1895 1896 case RECEIVED_CONNECTION_REQUEST: 1897 log_info("sending hci_accept_connection_request"); 1898 connection->state = ACCEPTED_CONNECTION_REQUEST; 1899 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 1900 return; 1901 1902 #ifdef HAVE_BLE 1903 case SEND_CANCEL_CONNECTION: 1904 connection->state = SENT_CANCEL_CONNECTION; 1905 hci_send_cmd(&hci_le_create_connection_cancel); 1906 return; 1907 #endif 1908 case SEND_DISCONNECT: 1909 connection->state = SENT_DISCONNECT; 1910 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1911 return; 1912 1913 default: 1914 break; 1915 } 1916 1917 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 1918 log_info("responding to link key request"); 1919 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 1920 link_key_t link_key; 1921 link_key_type_t link_key_type; 1922 if ( hci_stack->remote_device_db 1923 && hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type) 1924 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 1925 connection->link_key_type = link_key_type; 1926 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 1927 } else { 1928 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 1929 } 1930 return; 1931 } 1932 1933 if (connection->authentication_flags & DENY_PIN_CODE_REQUEST){ 1934 log_info("denying to pin request"); 1935 connectionClearAuthenticationFlags(connection, DENY_PIN_CODE_REQUEST); 1936 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 1937 return; 1938 } 1939 1940 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 1941 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 1942 log_info("IO Capability Request received, stack bondable %u, io cap %u", hci_stack->bondable, hci_stack->ssp_io_capability); 1943 if (hci_stack->bondable && (hci_stack->ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN)){ 1944 // tweak authentication requirements 1945 uint8_t authreq = hci_stack->ssp_authentication_requirement; 1946 if (connection->bonding_flags & BONDING_DEDICATED){ 1947 authreq = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING; 1948 } 1949 if (gap_mitm_protection_required_for_security_level(connection->requested_security_level)){ 1950 authreq |= 1; 1951 } 1952 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack->ssp_io_capability, NULL, authreq); 1953 } else { 1954 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 1955 } 1956 return; 1957 } 1958 1959 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 1960 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 1961 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 1962 return; 1963 } 1964 1965 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 1966 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 1967 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 1968 return; 1969 } 1970 1971 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 1972 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 1973 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 1974 return; 1975 } 1976 1977 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 1978 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 1979 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 1980 return; 1981 } 1982 if (connection->bonding_flags & BONDING_DISCONNECT_DEDICATED_DONE){ 1983 connection->bonding_flags &= ~BONDING_DISCONNECT_DEDICATED_DONE; 1984 connection->bonding_flags |= BONDING_EMIT_COMPLETE_ON_DISCONNECT; 1985 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // authentication done 1986 return; 1987 } 1988 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 1989 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 1990 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 1991 return; 1992 } 1993 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 1994 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 1995 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 1996 return; 1997 } 1998 1999 #ifdef HAVE_BLE 2000 if (connection->le_con_parameter_update_state == CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS){ 2001 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 2002 2003 uint16_t connection_interval_min = connection->le_conn_interval_min; 2004 connection->le_conn_interval_min = 0; 2005 hci_send_cmd(&hci_le_connection_update, connection->con_handle, connection_interval_min, 2006 connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout, 2007 0x0000, 0xffff); 2008 } 2009 #endif 2010 } 2011 2012 switch (hci_stack->state){ 2013 case HCI_STATE_INITIALIZING: 2014 hci_initializing_state_machine(); 2015 break; 2016 2017 case HCI_STATE_HALTING: 2018 2019 log_info("HCI_STATE_HALTING"); 2020 // close all open connections 2021 connection = (hci_connection_t *) hci_stack->connections; 2022 if (connection){ 2023 2024 // send disconnect 2025 if (!hci_can_send_command_packet_now()) return; 2026 2027 log_info("HCI_STATE_HALTING, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2028 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2029 2030 // send disconnected event right away - causes higher layer connections to get closed, too. 2031 hci_shutdown_connection(connection); 2032 return; 2033 } 2034 log_info("HCI_STATE_HALTING, calling off"); 2035 2036 // switch mode 2037 hci_power_control_off(); 2038 2039 log_info("HCI_STATE_HALTING, emitting state"); 2040 hci_emit_state(); 2041 log_info("HCI_STATE_HALTING, done"); 2042 break; 2043 2044 case HCI_STATE_FALLING_ASLEEP: 2045 switch(hci_stack->substate) { 2046 case 0: 2047 log_info("HCI_STATE_FALLING_ASLEEP"); 2048 // close all open connections 2049 connection = (hci_connection_t *) hci_stack->connections; 2050 2051 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2052 // don't close connections, if H4 supports power management 2053 if (bt_control_iphone_power_management_enabled()){ 2054 connection = NULL; 2055 } 2056 #endif 2057 if (connection){ 2058 2059 // send disconnect 2060 if (!hci_can_send_command_packet_now()) return; 2061 2062 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2063 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2064 2065 // send disconnected event right away - causes higher layer connections to get closed, too. 2066 hci_shutdown_connection(connection); 2067 return; 2068 } 2069 2070 if (hci_classic_supported()){ 2071 // disable page and inquiry scan 2072 if (!hci_can_send_command_packet_now()) return; 2073 2074 log_info("HCI_STATE_HALTING, disabling inq scans"); 2075 hci_send_cmd(&hci_write_scan_enable, hci_stack->connectable << 1); // drop inquiry scan but keep page scan 2076 2077 // continue in next sub state 2078 hci_stack->substate++; 2079 break; 2080 } 2081 // fall through for ble-only chips 2082 2083 case 2: 2084 log_info("HCI_STATE_HALTING, calling sleep"); 2085 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2086 // don't actually go to sleep, if H4 supports power management 2087 if (bt_control_iphone_power_management_enabled()){ 2088 // SLEEP MODE reached 2089 hci_stack->state = HCI_STATE_SLEEPING; 2090 hci_emit_state(); 2091 break; 2092 } 2093 #endif 2094 // switch mode 2095 hci_power_control_sleep(); // changes hci_stack->state to SLEEP 2096 hci_emit_state(); 2097 break; 2098 2099 default: 2100 break; 2101 } 2102 break; 2103 2104 default: 2105 break; 2106 } 2107 } 2108 2109 int hci_send_cmd_packet(uint8_t *packet, int size){ 2110 bd_addr_t addr; 2111 hci_connection_t * conn; 2112 // house-keeping 2113 2114 // create_connection? 2115 if (IS_COMMAND(packet, hci_create_connection)){ 2116 bt_flip_addr(addr, &packet[3]); 2117 log_info("Create_connection to %s", bd_addr_to_str(addr)); 2118 2119 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2120 if (!conn){ 2121 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2122 if (!conn){ 2123 // notify client that alloc failed 2124 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 2125 return 0; // don't sent packet to controller 2126 } 2127 conn->state = SEND_CREATE_CONNECTION; 2128 } 2129 log_info("conn state %u", conn->state); 2130 switch (conn->state){ 2131 // if connection active exists 2132 case OPEN: 2133 // and OPEN, emit connection complete command, don't send to controller 2134 hci_emit_connection_complete(conn, 0); 2135 return 0; 2136 case SEND_CREATE_CONNECTION: 2137 // connection created by hci, e.g. dedicated bonding 2138 break; 2139 default: 2140 // otherwise, just ignore as it is already in the open process 2141 return 0; 2142 } 2143 conn->state = SENT_CREATE_CONNECTION; 2144 } 2145 2146 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 2147 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 2148 } 2149 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 2150 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 2151 } 2152 2153 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 2154 if (hci_stack->remote_device_db){ 2155 bt_flip_addr(addr, &packet[3]); 2156 hci_stack->remote_device_db->delete_link_key(&addr); 2157 } 2158 } 2159 2160 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply) 2161 || IS_COMMAND(packet, hci_pin_code_request_reply)){ 2162 bt_flip_addr(addr, &packet[3]); 2163 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2164 if (conn){ 2165 connectionClearAuthenticationFlags(conn, LEGACY_PAIRING_ACTIVE); 2166 } 2167 } 2168 2169 if (IS_COMMAND(packet, hci_user_confirmation_request_negative_reply) 2170 || IS_COMMAND(packet, hci_user_confirmation_request_reply) 2171 || IS_COMMAND(packet, hci_user_passkey_request_negative_reply) 2172 || IS_COMMAND(packet, hci_user_passkey_request_reply)) { 2173 bt_flip_addr(addr, &packet[3]); 2174 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2175 if (conn){ 2176 connectionClearAuthenticationFlags(conn, SSP_PAIRING_ACTIVE); 2177 } 2178 } 2179 2180 #ifdef HAVE_BLE 2181 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 2182 hci_stack->adv_addr_type = packet[8]; 2183 } 2184 if (IS_COMMAND(packet, hci_le_set_random_address)){ 2185 bt_flip_addr(hci_stack->adv_address, &packet[3]); 2186 } 2187 #endif 2188 2189 hci_stack->num_cmd_packets--; 2190 2191 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, packet, size); 2192 int err = hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 2193 2194 // release packet buffer for synchronous transport implementations 2195 if (hci_transport_synchronous() && (packet == hci_stack->hci_packet_buffer)){ 2196 hci_stack->hci_packet_buffer_reserved = 0; 2197 } 2198 2199 return err; 2200 } 2201 2202 // disconnect because of security block 2203 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 2204 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2205 if (!connection) return; 2206 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 2207 } 2208 2209 2210 // Configure Secure Simple Pairing 2211 2212 // enable will enable SSP during init 2213 void hci_ssp_set_enable(int enable){ 2214 hci_stack->ssp_enable = enable; 2215 } 2216 2217 int hci_local_ssp_activated(){ 2218 return hci_ssp_supported() && hci_stack->ssp_enable; 2219 } 2220 2221 // if set, BTstack will respond to io capability request using authentication requirement 2222 void hci_ssp_set_io_capability(int io_capability){ 2223 hci_stack->ssp_io_capability = io_capability; 2224 } 2225 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 2226 hci_stack->ssp_authentication_requirement = authentication_requirement; 2227 } 2228 2229 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 2230 void hci_ssp_set_auto_accept(int auto_accept){ 2231 hci_stack->ssp_auto_accept = auto_accept; 2232 } 2233 2234 /** 2235 * pre: numcmds >= 0 - it's allowed to send a command to the controller 2236 */ 2237 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 2238 2239 if (!hci_can_send_command_packet_now()){ 2240 log_error("hci_send_cmd called but cannot send packet now"); 2241 return 0; 2242 } 2243 2244 // for HCI INITIALIZATION 2245 // log_info("hci_send_cmd: opcode %04x", cmd->opcode); 2246 hci_stack->last_cmd_opcode = cmd->opcode; 2247 2248 hci_reserve_packet_buffer(); 2249 uint8_t * packet = hci_stack->hci_packet_buffer; 2250 2251 va_list argptr; 2252 va_start(argptr, cmd); 2253 uint16_t size = hci_create_cmd_internal(packet, cmd, argptr); 2254 va_end(argptr); 2255 2256 return hci_send_cmd_packet(packet, size); 2257 } 2258 2259 // Create various non-HCI events. 2260 // TODO: generalize, use table similar to hci_create_command 2261 2262 void hci_emit_state(){ 2263 log_info("BTSTACK_EVENT_STATE %u", hci_stack->state); 2264 uint8_t event[3]; 2265 event[0] = BTSTACK_EVENT_STATE; 2266 event[1] = sizeof(event) - 2; 2267 event[2] = hci_stack->state; 2268 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2269 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2270 } 2271 2272 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 2273 uint8_t event[13]; 2274 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 2275 event[1] = sizeof(event) - 2; 2276 event[2] = status; 2277 bt_store_16(event, 3, conn->con_handle); 2278 bt_flip_addr(&event[5], conn->address); 2279 event[11] = 1; // ACL connection 2280 event[12] = 0; // encryption disabled 2281 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2282 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2283 } 2284 2285 void hci_emit_le_connection_complete(uint8_t address_type, bd_addr_t * address, uint16_t conn_handle, uint8_t status){ 2286 uint8_t event[21]; 2287 event[0] = HCI_EVENT_LE_META; 2288 event[1] = sizeof(event) - 2; 2289 event[2] = HCI_SUBEVENT_LE_CONNECTION_COMPLETE; 2290 event[3] = status; 2291 bt_store_16(event, 4, conn_handle); 2292 event[6] = 0; // TODO: role 2293 event[7] = address_type; 2294 bt_flip_addr(&event[8], *address); 2295 bt_store_16(event, 14, 0); // interval 2296 bt_store_16(event, 16, 0); // latency 2297 bt_store_16(event, 18, 0); // supervision timeout 2298 event[20] = 0; // master clock accuracy 2299 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2300 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2301 } 2302 2303 void hci_emit_disconnection_complete(uint16_t handle, uint8_t reason){ 2304 uint8_t event[6]; 2305 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 2306 event[1] = sizeof(event) - 2; 2307 event[2] = 0; // status = OK 2308 bt_store_16(event, 3, handle); 2309 event[5] = reason; 2310 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2311 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2312 } 2313 2314 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 2315 if (disable_l2cap_timeouts) return; 2316 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 2317 uint8_t event[4]; 2318 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 2319 event[1] = sizeof(event) - 2; 2320 bt_store_16(event, 2, conn->con_handle); 2321 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2322 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2323 } 2324 2325 void hci_emit_nr_connections_changed(){ 2326 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 2327 uint8_t event[3]; 2328 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 2329 event[1] = sizeof(event) - 2; 2330 event[2] = nr_hci_connections(); 2331 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2332 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2333 } 2334 2335 void hci_emit_hci_open_failed(){ 2336 log_info("BTSTACK_EVENT_POWERON_FAILED"); 2337 uint8_t event[2]; 2338 event[0] = BTSTACK_EVENT_POWERON_FAILED; 2339 event[1] = sizeof(event) - 2; 2340 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2341 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2342 } 2343 2344 #ifndef EMBEDDED 2345 void hci_emit_btstack_version() { 2346 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 2347 uint8_t event[6]; 2348 event[0] = BTSTACK_EVENT_VERSION; 2349 event[1] = sizeof(event) - 2; 2350 event[2] = BTSTACK_MAJOR; 2351 event[3] = BTSTACK_MINOR; 2352 bt_store_16(event, 4, BTSTACK_REVISION); 2353 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2354 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2355 } 2356 #endif 2357 2358 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 2359 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 2360 uint8_t event[3]; 2361 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 2362 event[1] = sizeof(event) - 2; 2363 event[2] = enabled; 2364 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2365 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2366 } 2367 2368 void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){ 2369 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 2370 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 2371 event[1] = sizeof(event) - 2 - 1; 2372 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 2373 bt_flip_addr(&event[3], *addr); 2374 memcpy(&event[9], name, 248); 2375 2376 event[9+248] = 0; // assert \0 for log_info 2377 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(*addr), &event[9]); 2378 2379 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 2380 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 2381 } 2382 2383 void hci_emit_discoverable_enabled(uint8_t enabled){ 2384 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 2385 uint8_t event[3]; 2386 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 2387 event[1] = sizeof(event) - 2; 2388 event[2] = enabled; 2389 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2390 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2391 } 2392 2393 void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){ 2394 log_info("hci_emit_security_level %u for handle %x", level, con_handle); 2395 uint8_t event[5]; 2396 int pos = 0; 2397 event[pos++] = GAP_SECURITY_LEVEL; 2398 event[pos++] = sizeof(event) - 2; 2399 bt_store_16(event, 2, con_handle); 2400 pos += 2; 2401 event[pos++] = level; 2402 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2403 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2404 } 2405 2406 void hci_emit_dedicated_bonding_result(bd_addr_t address, uint8_t status){ 2407 log_info("hci_emit_dedicated_bonding_result %u ", status); 2408 uint8_t event[9]; 2409 int pos = 0; 2410 event[pos++] = GAP_DEDICATED_BONDING_COMPLETED; 2411 event[pos++] = sizeof(event) - 2; 2412 event[pos++] = status; 2413 bt_flip_addr( * (bd_addr_t *) &event[pos], address); 2414 pos += 6; 2415 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2416 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2417 } 2418 2419 // query if remote side supports SSP 2420 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 2421 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2422 if (!connection) return 0; 2423 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 2424 } 2425 2426 int hci_ssp_supported_on_both_sides(hci_con_handle_t handle){ 2427 return hci_local_ssp_activated() && hci_remote_ssp_supported(handle); 2428 } 2429 2430 // GAP API 2431 /** 2432 * @bbrief enable/disable bonding. default is enabled 2433 * @praram enabled 2434 */ 2435 void gap_set_bondable_mode(int enable){ 2436 hci_stack->bondable = enable ? 1 : 0; 2437 } 2438 2439 /** 2440 * @brief map link keys to security levels 2441 */ 2442 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 2443 switch (link_key_type){ 2444 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 2445 return LEVEL_4; 2446 case COMBINATION_KEY: 2447 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 2448 return LEVEL_3; 2449 default: 2450 return LEVEL_2; 2451 } 2452 } 2453 2454 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 2455 if (!connection) return LEVEL_0; 2456 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 2457 return gap_security_level_for_link_key_type(connection->link_key_type); 2458 } 2459 2460 2461 int gap_mitm_protection_required_for_security_level(gap_security_level_t level){ 2462 log_info("gap_mitm_protection_required_for_security_level %u", level); 2463 return level > LEVEL_2; 2464 } 2465 2466 /** 2467 * @brief get current security level 2468 */ 2469 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 2470 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2471 if (!connection) return LEVEL_0; 2472 return gap_security_level_for_connection(connection); 2473 } 2474 2475 /** 2476 * @brief request connection to device to 2477 * @result GAP_AUTHENTICATION_RESULT 2478 */ 2479 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 2480 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2481 if (!connection){ 2482 hci_emit_security_level(con_handle, LEVEL_0); 2483 return; 2484 } 2485 gap_security_level_t current_level = gap_security_level(con_handle); 2486 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 2487 if (current_level >= requested_level){ 2488 hci_emit_security_level(con_handle, current_level); 2489 return; 2490 } 2491 2492 connection->requested_security_level = requested_level; 2493 2494 #if 0 2495 // sending encryption request without a link key results in an error. 2496 // TODO: figure out how to use it properly 2497 2498 // would enabling ecnryption suffice (>= LEVEL_2)? 2499 if (hci_stack->remote_device_db){ 2500 link_key_type_t link_key_type; 2501 link_key_t link_key; 2502 if (hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type)){ 2503 if (gap_security_level_for_link_key_type(link_key_type) >= requested_level){ 2504 connection->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 2505 return; 2506 } 2507 } 2508 } 2509 #endif 2510 2511 // try to authenticate connection 2512 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 2513 hci_run(); 2514 } 2515 2516 /** 2517 * @brief start dedicated bonding with device. disconnect after bonding 2518 * @param device 2519 * @param request MITM protection 2520 * @result GAP_DEDICATED_BONDING_COMPLETE 2521 */ 2522 int gap_dedicated_bonding(bd_addr_t device, int mitm_protection_required){ 2523 2524 // create connection state machine 2525 hci_connection_t * connection = create_connection_for_bd_addr_and_type(device, BD_ADDR_TYPE_CLASSIC); 2526 2527 if (!connection){ 2528 return BTSTACK_MEMORY_ALLOC_FAILED; 2529 } 2530 2531 // delete linkn key 2532 hci_drop_link_key_for_bd_addr( (bd_addr_t *) &device); 2533 2534 // configure LEVEL_2/3, dedicated bonding 2535 connection->state = SEND_CREATE_CONNECTION; 2536 connection->requested_security_level = mitm_protection_required ? LEVEL_3 : LEVEL_2; 2537 log_info("gap_dedicated_bonding, mitm %u -> level %u", mitm_protection_required, connection->requested_security_level); 2538 connection->bonding_flags = BONDING_DEDICATED; 2539 2540 // wait for GAP Security Result and send GAP Dedicated Bonding complete 2541 2542 // handle: connnection failure (connection complete != ok) 2543 // handle: authentication failure 2544 // handle: disconnect on done 2545 2546 hci_run(); 2547 2548 return 0; 2549 } 2550 2551 void gap_set_local_name(const char * local_name){ 2552 hci_stack->local_name = local_name; 2553 } 2554 2555 le_command_status_t le_central_start_scan(){ 2556 if (hci_stack->le_scanning_state == LE_SCANNING) return BLE_PERIPHERAL_OK; 2557 hci_stack->le_scanning_state = LE_START_SCAN; 2558 hci_run(); 2559 return BLE_PERIPHERAL_OK; 2560 } 2561 2562 le_command_status_t le_central_stop_scan(){ 2563 if ( hci_stack->le_scanning_state == LE_SCAN_IDLE) return BLE_PERIPHERAL_OK; 2564 hci_stack->le_scanning_state = LE_STOP_SCAN; 2565 hci_run(); 2566 return BLE_PERIPHERAL_OK; 2567 } 2568 2569 void le_central_set_scan_parameters(uint8_t scan_type, uint16_t scan_interval, uint16_t scan_window){ 2570 hci_stack->le_scan_type = scan_type; 2571 hci_stack->le_scan_interval = scan_interval; 2572 hci_stack->le_scan_window = scan_window; 2573 hci_run(); 2574 } 2575 2576 le_command_status_t le_central_connect(bd_addr_t * addr, bd_addr_type_t addr_type){ 2577 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 2578 if (!conn){ 2579 log_info("le_central_connect: no connection exists yet, creating context"); 2580 conn = create_connection_for_bd_addr_and_type(*addr, addr_type); 2581 if (!conn){ 2582 // notify client that alloc failed 2583 hci_emit_le_connection_complete(addr_type, addr, 0, BTSTACK_MEMORY_ALLOC_FAILED); 2584 log_info("le_central_connect: failed to alloc hci_connection_t"); 2585 return BLE_PERIPHERAL_NOT_CONNECTED; // don't sent packet to controller 2586 } 2587 conn->state = SEND_CREATE_CONNECTION; 2588 log_info("le_central_connect: send create connection next"); 2589 hci_run(); 2590 return BLE_PERIPHERAL_OK; 2591 } 2592 2593 if (!hci_is_le_connection(conn) || 2594 conn->state == SEND_CREATE_CONNECTION || 2595 conn->state == SENT_CREATE_CONNECTION) { 2596 hci_emit_le_connection_complete(conn->address_type, &conn->address, 0, ERROR_CODE_COMMAND_DISALLOWED); 2597 log_error("le_central_connect: classic connection or connect is already being created"); 2598 return BLE_PERIPHERAL_IN_WRONG_STATE; 2599 } 2600 2601 log_info("le_central_connect: context exists with state %u", conn->state); 2602 hci_emit_le_connection_complete(conn->address_type, &conn->address, conn->con_handle, 0); 2603 hci_run(); 2604 return BLE_PERIPHERAL_OK; 2605 } 2606 2607 // @assumption: only a single outgoing LE Connection exists 2608 static hci_connection_t * le_central_get_outgoing_connection(){ 2609 linked_item_t *it; 2610 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 2611 hci_connection_t * conn = (hci_connection_t *) it; 2612 if (!hci_is_le_connection(conn)) continue; 2613 switch (conn->state){ 2614 case SEND_CREATE_CONNECTION: 2615 case SENT_CREATE_CONNECTION: 2616 return conn; 2617 default: 2618 break; 2619 }; 2620 } 2621 return NULL; 2622 } 2623 2624 le_command_status_t le_central_connect_cancel(){ 2625 hci_connection_t * conn = le_central_get_outgoing_connection(); 2626 switch (conn->state){ 2627 case SEND_CREATE_CONNECTION: 2628 // skip sending create connection and emit event instead 2629 hci_emit_le_connection_complete(conn->address_type, &conn->address, 0, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 2630 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 2631 btstack_memory_hci_connection_free( conn ); 2632 break; 2633 case SENT_CREATE_CONNECTION: 2634 // request to send cancel connection 2635 conn->state = SEND_CANCEL_CONNECTION; 2636 hci_run(); 2637 break; 2638 default: 2639 break; 2640 } 2641 return BLE_PERIPHERAL_OK; 2642 } 2643 2644 /** 2645 * @brief Updates the connection parameters for a given LE connection 2646 * @param handle 2647 * @param conn_interval_min (unit: 1.25ms) 2648 * @param conn_interval_max (unit: 1.25ms) 2649 * @param conn_latency 2650 * @param supervision_timeout (unit: 10ms) 2651 * @returns 0 if ok 2652 */ 2653 int gap_update_connection_parameters(hci_con_handle_t con_handle, uint16_t conn_interval_min, 2654 uint16_t conn_interval_max, uint16_t conn_latency, uint16_t supervision_timeout){ 2655 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2656 if (!connection) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2657 connection->le_conn_interval_min = conn_interval_min; 2658 connection->le_conn_interval_max = conn_interval_max; 2659 connection->le_conn_latency = conn_latency; 2660 connection->le_supervision_timeout = supervision_timeout; 2661 return 0; 2662 } 2663 2664 le_command_status_t gap_disconnect(hci_con_handle_t handle){ 2665 hci_connection_t * conn = hci_connection_for_handle(handle); 2666 if (!conn){ 2667 hci_emit_disconnection_complete(handle, 0); 2668 return BLE_PERIPHERAL_OK; 2669 } 2670 conn->state = SEND_DISCONNECT; 2671 hci_run(); 2672 return BLE_PERIPHERAL_OK; 2673 } 2674 2675 void hci_disconnect_all(){ 2676 linked_list_iterator_t it; 2677 linked_list_iterator_init(&it, &hci_stack->connections); 2678 while (linked_list_iterator_has_next(&it)){ 2679 hci_connection_t * con = (hci_connection_t*) linked_list_iterator_next(&it); 2680 if (con->state == SENT_DISCONNECT) continue; 2681 con->state = SEND_DISCONNECT; 2682 } 2683 hci_run(); 2684 } 2685