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_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 806 break; 807 case 2: // LOCAL BAUD CHANGE 808 log_info("Local baud rate change"); 809 hci_stack->hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack->config)->baudrate_main); 810 hci_stack->substate += 2; 811 // break missing here for fall through 812 813 case 3: // SET BD ADDR 814 if ( hci_stack->custom_bd_addr_set && hci_stack->control && hci_stack->control->set_bd_addr_cmd){ 815 log_info("Set Public BD ADDR to %s", bd_addr_to_str(hci_stack->custom_bd_addr)); 816 hci_stack->control->set_bd_addr_cmd(hci_stack->config, hci_stack->custom_bd_addr, hci_stack->hci_packet_buffer); 817 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 818 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 819 break; 820 } 821 hci_stack->substate += 2; 822 // break missing here for fall through 823 824 case 4: 825 log_info("Custom init"); 826 // Custom initialization 827 if (hci_stack->control && hci_stack->control->next_cmd){ 828 int valid_cmd = (*hci_stack->control->next_cmd)(hci_stack->config, hci_stack->hci_packet_buffer); 829 if (valid_cmd){ 830 int size = 3 + hci_stack->hci_packet_buffer[2]; 831 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 832 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, hci_stack->hci_packet_buffer, size); 833 hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack->hci_packet_buffer, size); 834 hci_stack->substate = 3 << 1; // more init commands 835 break; 836 } 837 log_info("hci_run: init script done"); 838 } 839 // otherwise continue 840 hci_send_cmd(&hci_read_bd_addr); 841 break; 842 case 5: 843 hci_send_cmd(&hci_read_buffer_size); 844 break; 845 case 6: 846 hci_send_cmd(&hci_read_local_supported_features); 847 break; 848 case 7: 849 if (hci_le_supported()){ 850 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 851 } else { 852 // Kensington Bluetooth 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 853 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 854 } 855 856 // skip Classic init commands for LE only chipsets 857 if (!hci_classic_supported()){ 858 if (hci_le_supported()){ 859 hci_stack->substate = 12 << 1; // skip all classic command 860 } else { 861 log_error("Neither BR/EDR nor LE supported"); 862 hci_stack->substate = 15 << 1; // skip all 863 } 864 } 865 break; 866 case 8: 867 if (hci_ssp_supported()){ 868 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack->ssp_enable); 869 break; 870 } 871 hci_stack->substate += 2; 872 // break missing here for fall through 873 874 case 9: 875 // ca. 15 sec 876 hci_send_cmd(&hci_write_page_timeout, 0x6000); 877 break; 878 case 10: 879 hci_send_cmd(&hci_write_class_of_device, hci_stack->class_of_device); 880 break; 881 case 11: 882 if (hci_stack->local_name){ 883 hci_send_cmd(&hci_write_local_name, hci_stack->local_name); 884 } else { 885 char hostname[30]; 886 #ifdef EMBEDDED 887 // BTstack-11:22:33:44:55:66 888 strcpy(hostname, "BTstack "); 889 strcat(hostname, bd_addr_to_str(hci_stack->local_bd_addr)); 890 log_info("---> Name %s", hostname); 891 #else 892 // hostname for POSIX systems 893 gethostname(hostname, 30); 894 hostname[29] = '\0'; 895 #endif 896 hci_send_cmd(&hci_write_local_name, hostname); 897 } 898 break; 899 case 12: 900 hci_send_cmd(&hci_write_scan_enable, (hci_stack->connectable << 1) | hci_stack->discoverable); // page scan 901 if (!hci_le_supported()){ 902 // SKIP LE init for Classic only configuration 903 hci_stack->substate = 15 << 1; 904 } 905 break; 906 907 #ifdef HAVE_BLE 908 // LE INIT 909 case 13: 910 hci_send_cmd(&hci_le_read_buffer_size); 911 break; 912 case 14: 913 // LE Supported Host = 1, Simultaneous Host = 0 914 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 915 break; 916 case 15: 917 // LE Scan Parameters: active scanning, 300 ms interval, 30 ms window, public address, accept all advs 918 hci_send_cmd(&hci_le_set_scan_parameters, 1, 0x1e0, 0x30, 0, 0); 919 break; 920 #endif 921 922 // DONE 923 case 16: 924 // done. 925 hci_stack->state = HCI_STATE_WORKING; 926 hci_emit_state(); 927 break; 928 default: 929 break; 930 } 931 hci_stack->substate++; 932 } 933 934 // avoid huge local variables 935 #ifndef EMBEDDED 936 static device_name_t device_name; 937 #endif 938 static void event_handler(uint8_t *packet, int size){ 939 940 uint16_t event_length = packet[1]; 941 942 // assert packet is complete 943 if (size != event_length + 2){ 944 log_error("hci.c: event_handler called with event packet of wrong size %u, expected %u => dropping packet", size, event_length + 2); 945 return; 946 } 947 948 bd_addr_t addr; 949 bd_addr_type_t addr_type; 950 uint8_t link_type; 951 hci_con_handle_t handle; 952 hci_connection_t * conn; 953 int i; 954 955 // log_info("HCI:EVENT:%02x", packet[0]); 956 957 switch (packet[0]) { 958 959 case HCI_EVENT_COMMAND_COMPLETE: 960 // get num cmd packets 961 // log_info("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u", hci_stack->num_cmd_packets, packet[2]); 962 hci_stack->num_cmd_packets = packet[2]; 963 964 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 965 // from offset 5 966 // status 967 // "The HC_ACL_Data_Packet_Length return parameter will be used to determine the size of the L2CAP segments contained in ACL Data Packets" 968 hci_stack->acl_data_packet_length = READ_BT_16(packet, 6); 969 // ignore: SCO data packet len (8) 970 hci_stack->acl_packets_total_num = packet[9]; 971 // ignore: total num SCO packets 972 if (hci_stack->state == HCI_STATE_INITIALIZING){ 973 // determine usable ACL payload size 974 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->acl_data_packet_length){ 975 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 976 } 977 log_info("hci_read_buffer_size: used size %u, count %u", 978 hci_stack->acl_data_packet_length, hci_stack->acl_packets_total_num); 979 } 980 } 981 #ifdef HAVE_BLE 982 if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_buffer_size)){ 983 hci_stack->le_data_packets_length = READ_BT_16(packet, 6); 984 hci_stack->le_acl_packets_total_num = packet[8]; 985 // determine usable ACL payload size 986 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->le_data_packets_length){ 987 hci_stack->le_data_packets_length = HCI_ACL_PAYLOAD_SIZE; 988 } 989 log_info("hci_le_read_buffer_size: size %u, count %u", hci_stack->le_data_packets_length, hci_stack->le_acl_packets_total_num); 990 } 991 #endif 992 // Dump local address 993 if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)) { 994 bt_flip_addr(hci_stack->local_bd_addr, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1]); 995 log_info("Local Address, Status: 0x%02x: Addr: %s", 996 packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE], bd_addr_to_str(hci_stack->local_bd_addr)); 997 } 998 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 999 hci_emit_discoverable_enabled(hci_stack->discoverable); 1000 } 1001 // Note: HCI init checks 1002 if (COMMAND_COMPLETE_EVENT(packet, hci_read_local_supported_features)){ 1003 memcpy(hci_stack->local_supported_features, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1], 8); 1004 log_info("Local Supported Features: 0x%02x%02x%02x%02x%02x%02x%02x%02x", 1005 hci_stack->local_supported_features[0], hci_stack->local_supported_features[1], 1006 hci_stack->local_supported_features[2], hci_stack->local_supported_features[3], 1007 hci_stack->local_supported_features[4], hci_stack->local_supported_features[5], 1008 hci_stack->local_supported_features[6], hci_stack->local_supported_features[7]); 1009 1010 // determine usable ACL packet types based on host buffer size and supported features 1011 hci_stack->packet_types = hci_acl_packet_types_for_buffer_size_and_local_features(HCI_ACL_PAYLOAD_SIZE, &hci_stack->local_supported_features[0]); 1012 log_info("packet types %04x", hci_stack->packet_types); 1013 1014 // Classic/LE 1015 log_info("BR/EDR support %u, LE support %u", hci_classic_supported(), hci_le_supported()); 1016 } 1017 break; 1018 1019 case HCI_EVENT_COMMAND_STATUS: 1020 // get num cmd packets 1021 // log_info("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u", hci_stack->num_cmd_packets, packet[3]); 1022 hci_stack->num_cmd_packets = packet[3]; 1023 break; 1024 1025 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:{ 1026 int offset = 3; 1027 for (i=0; i<packet[2];i++){ 1028 handle = READ_BT_16(packet, offset); 1029 offset += 2; 1030 uint16_t num_packets = READ_BT_16(packet, offset); 1031 offset += 2; 1032 1033 conn = hci_connection_for_handle(handle); 1034 if (!conn){ 1035 log_error("hci_number_completed_packet lists unused con handle %u", handle); 1036 continue; 1037 } 1038 1039 if (conn->num_acl_packets_sent >= num_packets){ 1040 conn->num_acl_packets_sent -= num_packets; 1041 } else { 1042 log_error("hci_number_completed_packets, more slots freed then sent."); 1043 conn->num_acl_packets_sent = 0; 1044 } 1045 // log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u", num_packets, handle, conn->num_acl_packets_sent); 1046 } 1047 break; 1048 } 1049 case HCI_EVENT_CONNECTION_REQUEST: 1050 bt_flip_addr(addr, &packet[2]); 1051 // TODO: eval COD 8-10 1052 link_type = packet[11]; 1053 log_info("Connection_incoming: %s, type %u", bd_addr_to_str(addr), link_type); 1054 if (link_type == 1) { // ACL 1055 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1056 if (!conn) { 1057 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 1058 } 1059 if (!conn) { 1060 // CONNECTION REJECTED DUE TO LIMITED RESOURCES (0X0D) 1061 hci_stack->decline_reason = 0x0d; 1062 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1063 break; 1064 } 1065 conn->state = RECEIVED_CONNECTION_REQUEST; 1066 hci_run(); 1067 } else { 1068 // SYNCHRONOUS CONNECTION LIMIT TO A DEVICE EXCEEDED (0X0A) 1069 hci_stack->decline_reason = 0x0a; 1070 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1071 } 1072 break; 1073 1074 case HCI_EVENT_CONNECTION_COMPLETE: 1075 // Connection management 1076 bt_flip_addr(addr, &packet[5]); 1077 log_info("Connection_complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 1078 addr_type = BD_ADDR_TYPE_CLASSIC; 1079 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1080 if (conn) { 1081 if (!packet[2]){ 1082 conn->state = OPEN; 1083 conn->con_handle = READ_BT_16(packet, 3); 1084 conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES; 1085 1086 // restart timer 1087 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1088 run_loop_add_timer(&conn->timeout); 1089 1090 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1091 1092 hci_emit_nr_connections_changed(); 1093 } else { 1094 int notify_dedicated_bonding_failed = conn->bonding_flags & BONDING_DEDICATED; 1095 uint8_t status = packet[2]; 1096 bd_addr_t bd_address; 1097 memcpy(&bd_address, conn->address, 6); 1098 1099 // connection failed, remove entry 1100 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1101 btstack_memory_hci_connection_free( conn ); 1102 1103 // notify client if dedicated bonding 1104 if (notify_dedicated_bonding_failed){ 1105 log_info("hci notify_dedicated_bonding_failed"); 1106 hci_emit_dedicated_bonding_result(bd_address, status); 1107 } 1108 1109 // if authentication error, also delete link key 1110 if (packet[2] == 0x05) { 1111 hci_drop_link_key_for_bd_addr(&addr); 1112 } 1113 } 1114 } 1115 break; 1116 1117 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 1118 handle = READ_BT_16(packet, 3); 1119 conn = hci_connection_for_handle(handle); 1120 if (!conn) break; 1121 if (!packet[2]){ 1122 uint8_t * features = &packet[5]; 1123 if (features[6] & (1 << 3)){ 1124 conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP; 1125 } 1126 } 1127 conn->bonding_flags |= BONDING_RECEIVED_REMOTE_FEATURES; 1128 log_info("HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE, bonding flags %x", conn->bonding_flags); 1129 if (conn->bonding_flags & BONDING_DEDICATED){ 1130 conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 1131 } 1132 break; 1133 1134 case HCI_EVENT_LINK_KEY_REQUEST: 1135 log_info("HCI_EVENT_LINK_KEY_REQUEST"); 1136 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 1137 // non-bondable mode: link key negative reply will be sent by HANDLE_LINK_KEY_REQUEST 1138 if (hci_stack->bondable && !hci_stack->remote_device_db) break; 1139 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], HANDLE_LINK_KEY_REQUEST); 1140 hci_run(); 1141 // request handled by hci_run() as HANDLE_LINK_KEY_REQUEST gets set 1142 return; 1143 1144 case HCI_EVENT_LINK_KEY_NOTIFICATION: { 1145 bt_flip_addr(addr, &packet[2]); 1146 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1147 if (!conn) break; 1148 conn->authentication_flags |= RECV_LINK_KEY_NOTIFICATION; 1149 link_key_type_t link_key_type = (link_key_type_t)packet[24]; 1150 // Change Connection Encryption keeps link key type 1151 if (link_key_type != CHANGED_COMBINATION_KEY){ 1152 conn->link_key_type = link_key_type; 1153 } 1154 if (!hci_stack->remote_device_db) break; 1155 hci_stack->remote_device_db->put_link_key(&addr, (link_key_t *) &packet[8], conn->link_key_type); 1156 // still forward event to allow dismiss of pairing dialog 1157 break; 1158 } 1159 1160 case HCI_EVENT_PIN_CODE_REQUEST: 1161 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], LEGACY_PAIRING_ACTIVE); 1162 // non-bondable mode: pin code negative reply will be sent 1163 if (!hci_stack->bondable){ 1164 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], DENY_PIN_CODE_REQUEST); 1165 hci_run(); 1166 return; 1167 } 1168 // PIN CODE REQUEST means the link key request didn't succee -> delete stored link key 1169 if (!hci_stack->remote_device_db) break; 1170 bt_flip_addr(addr, &packet[2]); 1171 hci_stack->remote_device_db->delete_link_key(&addr); 1172 break; 1173 1174 case HCI_EVENT_IO_CAPABILITY_REQUEST: 1175 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_IO_CAPABILITIES_REQUEST); 1176 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_IO_CAPABILITIES_REPLY); 1177 break; 1178 1179 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 1180 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1181 if (!hci_stack->ssp_auto_accept) break; 1182 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_CONFIRM_REPLY); 1183 break; 1184 1185 case HCI_EVENT_USER_PASSKEY_REQUEST: 1186 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1187 if (!hci_stack->ssp_auto_accept) break; 1188 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_PASSKEY_REPLY); 1189 break; 1190 1191 case HCI_EVENT_ENCRYPTION_CHANGE: 1192 handle = READ_BT_16(packet, 3); 1193 conn = hci_connection_for_handle(handle); 1194 if (!conn) break; 1195 if (packet[2] == 0) { 1196 if (packet[5]){ 1197 conn->authentication_flags |= CONNECTION_ENCRYPTED; 1198 } else { 1199 conn->authentication_flags &= ~CONNECTION_ENCRYPTED; 1200 } 1201 } 1202 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1203 break; 1204 1205 case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT: 1206 handle = READ_BT_16(packet, 3); 1207 conn = hci_connection_for_handle(handle); 1208 if (!conn) break; 1209 1210 // dedicated bonding: send result and disconnect 1211 if (conn->bonding_flags & BONDING_DEDICATED){ 1212 conn->bonding_flags &= ~BONDING_DEDICATED; 1213 conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE; 1214 conn->bonding_status = packet[2]; 1215 break; 1216 } 1217 1218 if (packet[2] == 0 && gap_security_level_for_link_key_type(conn->link_key_type) >= conn->requested_security_level){ 1219 // link key sufficient for requested security 1220 conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 1221 break; 1222 } 1223 // not enough 1224 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1225 break; 1226 1227 #ifndef EMBEDDED 1228 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 1229 if (!hci_stack->remote_device_db) break; 1230 if (packet[2]) break; // status not ok 1231 bt_flip_addr(addr, &packet[3]); 1232 // fix for invalid remote names - terminate on 0xff 1233 for (i=0; i<248;i++){ 1234 if (packet[9+i] == 0xff){ 1235 packet[9+i] = 0; 1236 break; 1237 } 1238 } 1239 memset(&device_name, 0, sizeof(device_name_t)); 1240 strncpy((char*) device_name, (char*) &packet[9], 248); 1241 hci_stack->remote_device_db->put_name(&addr, &device_name); 1242 break; 1243 1244 case HCI_EVENT_INQUIRY_RESULT: 1245 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:{ 1246 if (!hci_stack->remote_device_db) break; 1247 // first send inq result packet 1248 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1249 // then send cached remote names 1250 int offset = 3; 1251 for (i=0; i<packet[2];i++){ 1252 bt_flip_addr(addr, &packet[offset]); 1253 offset += 14; // 6 + 1 + 1 + 1 + 3 + 2; 1254 if (hci_stack->remote_device_db->get_name(&addr, &device_name)){ 1255 hci_emit_remote_name_cached(&addr, &device_name); 1256 } 1257 } 1258 return; 1259 } 1260 #endif 1261 1262 // HCI_EVENT_DISCONNECTION_COMPLETE 1263 // has been split, to first notify stack before shutting connection down 1264 // see end of function, too. 1265 case HCI_EVENT_DISCONNECTION_COMPLETE: 1266 if (packet[2]) break; // status != 0 1267 handle = READ_BT_16(packet, 3); 1268 hci_connection_t * conn = hci_connection_for_handle(handle); 1269 if (!conn) break; // no conn struct anymore 1270 conn->state = RECEIVED_DISCONNECTION_COMPLETE; 1271 break; 1272 1273 case HCI_EVENT_HARDWARE_ERROR: 1274 if(hci_stack->control && hci_stack->control->hw_error){ 1275 (*hci_stack->control->hw_error)(); 1276 } else { 1277 // if no special requests, just reboot stack 1278 hci_power_control_off(); 1279 hci_power_control_on(); 1280 } 1281 break; 1282 1283 case DAEMON_EVENT_HCI_PACKET_SENT: 1284 // release packet buffer only for asynchronous transport and if there are not further fragements 1285 if (hci_transport_synchronous()) { 1286 log_error("Synchronous HCI Transport shouldn't send DAEMON_EVENT_HCI_PACKET_SENT"); 1287 return; // instead of break: to avoid re-entering hci_run() 1288 } 1289 if (hci_stack->acl_fragmentation_total_size) break; 1290 hci_release_packet_buffer(); 1291 break; 1292 1293 #ifdef HAVE_BLE 1294 case HCI_EVENT_LE_META: 1295 switch (packet[2]){ 1296 case HCI_SUBEVENT_LE_ADVERTISING_REPORT: 1297 log_info("advertising report received"); 1298 if (hci_stack->le_scanning_state != LE_SCANNING) break; 1299 le_handle_advertisement_report(packet, size); 1300 break; 1301 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 1302 // Connection management 1303 bt_flip_addr(addr, &packet[8]); 1304 addr_type = (bd_addr_type_t)packet[7]; 1305 log_info("LE Connection_complete (status=%u) type %u, %s", packet[3], addr_type, bd_addr_to_str(addr)); 1306 // LE connections are auto-accepted, so just create a connection if there isn't one already 1307 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1308 if (packet[3]){ 1309 if (conn){ 1310 // outgoing connection failed, remove entry 1311 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1312 btstack_memory_hci_connection_free( conn ); 1313 } 1314 // if authentication error, also delete link key 1315 if (packet[3] == 0x05) { 1316 hci_drop_link_key_for_bd_addr(&addr); 1317 } 1318 break; 1319 } 1320 if (!conn){ 1321 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 1322 } 1323 if (!conn){ 1324 // no memory 1325 break; 1326 } 1327 1328 conn->state = OPEN; 1329 conn->con_handle = READ_BT_16(packet, 4); 1330 1331 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 1332 1333 // restart timer 1334 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1335 // run_loop_add_timer(&conn->timeout); 1336 1337 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1338 1339 hci_emit_nr_connections_changed(); 1340 break; 1341 1342 // log_info("LE buffer size: %u, count %u", READ_BT_16(packet,6), packet[8]); 1343 1344 default: 1345 break; 1346 } 1347 break; 1348 #endif 1349 default: 1350 break; 1351 } 1352 1353 // handle BT initialization 1354 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1355 hci_initializing_event_handler(packet, size); 1356 } 1357 1358 // help with BT sleep 1359 if (hci_stack->state == HCI_STATE_FALLING_ASLEEP 1360 && hci_stack->substate == 1 1361 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1362 hci_stack->substate++; 1363 } 1364 1365 // notify upper stack 1366 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1367 1368 // moved here to give upper stack a chance to close down everything with hci_connection_t intact 1369 if (packet[0] == HCI_EVENT_DISCONNECTION_COMPLETE){ 1370 if (!packet[2]){ 1371 handle = READ_BT_16(packet, 3); 1372 hci_connection_t * conn = hci_connection_for_handle(handle); 1373 if (conn) { 1374 uint8_t status = conn->bonding_status; 1375 uint16_t flags = conn->bonding_flags; 1376 bd_addr_t bd_address; 1377 memcpy(&bd_address, conn->address, 6); 1378 hci_shutdown_connection(conn); 1379 // connection struct is gone, don't access anymore 1380 if (flags & BONDING_EMIT_COMPLETE_ON_DISCONNECT){ 1381 hci_emit_dedicated_bonding_result(bd_address, status); 1382 } 1383 } 1384 } 1385 } 1386 1387 // execute main loop 1388 hci_run(); 1389 } 1390 1391 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1392 hci_dump_packet(packet_type, 1, packet, size); 1393 switch (packet_type) { 1394 case HCI_EVENT_PACKET: 1395 event_handler(packet, size); 1396 break; 1397 case HCI_ACL_DATA_PACKET: 1398 acl_handler(packet, size); 1399 break; 1400 default: 1401 break; 1402 } 1403 } 1404 1405 /** Register HCI packet handlers */ 1406 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 1407 hci_stack->packet_handler = handler; 1408 } 1409 1410 static void hci_state_reset(){ 1411 // no connections yet 1412 hci_stack->connections = NULL; 1413 1414 // keep discoverable/connectable as this has been requested by the client(s) 1415 // hci_stack->discoverable = 0; 1416 // hci_stack->connectable = 0; 1417 // hci_stack->bondable = 1; 1418 1419 // buffer is free 1420 hci_stack->hci_packet_buffer_reserved = 0; 1421 1422 // no pending cmds 1423 hci_stack->decline_reason = 0; 1424 hci_stack->new_scan_enable_value = 0xff; 1425 1426 // LE 1427 hci_stack->adv_addr_type = 0; 1428 memset(hci_stack->adv_address, 0, 6); 1429 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1430 hci_stack->le_scan_type = 0xff; 1431 hci_stack->le_connection_parameter_range.le_conn_interval_min = 0x0006; 1432 hci_stack->le_connection_parameter_range.le_conn_interval_max = 0x0C80; 1433 hci_stack->le_connection_parameter_range.le_conn_latency_min = 0x0000; 1434 hci_stack->le_connection_parameter_range.le_conn_latency_max = 0x03E8; 1435 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = 0x000A; 1436 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = 0x0C80; 1437 } 1438 1439 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 1440 1441 #ifdef HAVE_MALLOC 1442 if (!hci_stack) { 1443 hci_stack = (hci_stack_t*) malloc(sizeof(hci_stack_t)); 1444 } 1445 #else 1446 hci_stack = &hci_stack_static; 1447 #endif 1448 memset(hci_stack, 0, sizeof(hci_stack_t)); 1449 1450 // reference to use transport layer implementation 1451 hci_stack->hci_transport = transport; 1452 1453 // references to used control implementation 1454 hci_stack->control = control; 1455 1456 // reference to used config 1457 hci_stack->config = config; 1458 1459 // higher level handler 1460 hci_stack->packet_handler = dummy_handler; 1461 1462 // store and open remote device db 1463 hci_stack->remote_device_db = remote_device_db; 1464 if (hci_stack->remote_device_db) { 1465 hci_stack->remote_device_db->open(); 1466 } 1467 1468 // max acl payload size defined in config.h 1469 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1470 1471 // register packet handlers with transport 1472 transport->register_packet_handler(&packet_handler); 1473 1474 hci_stack->state = HCI_STATE_OFF; 1475 1476 // class of device 1477 hci_stack->class_of_device = 0x007a020c; // Smartphone 1478 1479 // bondable by default 1480 hci_stack->bondable = 1; 1481 1482 // Secure Simple Pairing default: enable, no I/O capabilities, general bonding, mitm not required, auto accept 1483 hci_stack->ssp_enable = 1; 1484 hci_stack->ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 1485 hci_stack->ssp_authentication_requirement = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING; 1486 hci_stack->ssp_auto_accept = 1; 1487 1488 hci_state_reset(); 1489 } 1490 1491 void hci_close(){ 1492 // close remote device db 1493 if (hci_stack->remote_device_db) { 1494 hci_stack->remote_device_db->close(); 1495 } 1496 while (hci_stack->connections) { 1497 // cancel all l2cap connections 1498 hci_emit_disconnection_complete(((hci_connection_t *) hci_stack->connections)->con_handle, 0x16); // terminated by local host 1499 hci_shutdown_connection((hci_connection_t *) hci_stack->connections); 1500 } 1501 hci_power_control(HCI_POWER_OFF); 1502 1503 #ifdef HAVE_MALLOC 1504 free(hci_stack); 1505 #endif 1506 hci_stack = NULL; 1507 } 1508 1509 void hci_set_class_of_device(uint32_t class_of_device){ 1510 hci_stack->class_of_device = class_of_device; 1511 } 1512 1513 // Set Public BD ADDR - passed on to Bluetooth chipset if supported in bt_control_h 1514 void hci_set_bd_addr(bd_addr_t addr){ 1515 memcpy(hci_stack->custom_bd_addr, addr, 6); 1516 hci_stack->custom_bd_addr_set = 1; 1517 } 1518 1519 void hci_disable_l2cap_timeout_check(){ 1520 disable_l2cap_timeouts = 1; 1521 } 1522 // State-Module-Driver overview 1523 // state module low-level 1524 // HCI_STATE_OFF off close 1525 // HCI_STATE_INITIALIZING, on open 1526 // HCI_STATE_WORKING, on open 1527 // HCI_STATE_HALTING, on open 1528 // HCI_STATE_SLEEPING, off/sleep close 1529 // HCI_STATE_FALLING_ASLEEP on open 1530 1531 static int hci_power_control_on(void){ 1532 1533 // power on 1534 int err = 0; 1535 if (hci_stack->control && hci_stack->control->on){ 1536 err = (*hci_stack->control->on)(hci_stack->config); 1537 } 1538 if (err){ 1539 log_error( "POWER_ON failed"); 1540 hci_emit_hci_open_failed(); 1541 return err; 1542 } 1543 1544 // open low-level device 1545 err = hci_stack->hci_transport->open(hci_stack->config); 1546 if (err){ 1547 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1548 if (hci_stack->control && hci_stack->control->off){ 1549 (*hci_stack->control->off)(hci_stack->config); 1550 } 1551 hci_emit_hci_open_failed(); 1552 return err; 1553 } 1554 return 0; 1555 } 1556 1557 static void hci_power_control_off(void){ 1558 1559 log_info("hci_power_control_off"); 1560 1561 // close low-level device 1562 hci_stack->hci_transport->close(hci_stack->config); 1563 1564 log_info("hci_power_control_off - hci_transport closed"); 1565 1566 // power off 1567 if (hci_stack->control && hci_stack->control->off){ 1568 (*hci_stack->control->off)(hci_stack->config); 1569 } 1570 1571 log_info("hci_power_control_off - control closed"); 1572 1573 hci_stack->state = HCI_STATE_OFF; 1574 } 1575 1576 static void hci_power_control_sleep(void){ 1577 1578 log_info("hci_power_control_sleep"); 1579 1580 #if 0 1581 // don't close serial port during sleep 1582 1583 // close low-level device 1584 hci_stack->hci_transport->close(hci_stack->config); 1585 #endif 1586 1587 // sleep mode 1588 if (hci_stack->control && hci_stack->control->sleep){ 1589 (*hci_stack->control->sleep)(hci_stack->config); 1590 } 1591 1592 hci_stack->state = HCI_STATE_SLEEPING; 1593 } 1594 1595 static int hci_power_control_wake(void){ 1596 1597 log_info("hci_power_control_wake"); 1598 1599 // wake on 1600 if (hci_stack->control && hci_stack->control->wake){ 1601 (*hci_stack->control->wake)(hci_stack->config); 1602 } 1603 1604 #if 0 1605 // open low-level device 1606 int err = hci_stack->hci_transport->open(hci_stack->config); 1607 if (err){ 1608 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1609 if (hci_stack->control && hci_stack->control->off){ 1610 (*hci_stack->control->off)(hci_stack->config); 1611 } 1612 hci_emit_hci_open_failed(); 1613 return err; 1614 } 1615 #endif 1616 1617 return 0; 1618 } 1619 1620 static void hci_power_transition_to_initializing(void){ 1621 // set up state machine 1622 hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent 1623 hci_stack->hci_packet_buffer_reserved = 0; 1624 hci_stack->state = HCI_STATE_INITIALIZING; 1625 hci_stack->substate = 0; 1626 } 1627 1628 int hci_power_control(HCI_POWER_MODE power_mode){ 1629 1630 log_info("hci_power_control: %u, current mode %u", power_mode, hci_stack->state); 1631 1632 int err = 0; 1633 switch (hci_stack->state){ 1634 1635 case HCI_STATE_OFF: 1636 switch (power_mode){ 1637 case HCI_POWER_ON: 1638 err = hci_power_control_on(); 1639 if (err) { 1640 log_error("hci_power_control_on() error %u", err); 1641 return err; 1642 } 1643 hci_power_transition_to_initializing(); 1644 break; 1645 case HCI_POWER_OFF: 1646 // do nothing 1647 break; 1648 case HCI_POWER_SLEEP: 1649 // do nothing (with SLEEP == OFF) 1650 break; 1651 } 1652 break; 1653 1654 case HCI_STATE_INITIALIZING: 1655 switch (power_mode){ 1656 case HCI_POWER_ON: 1657 // do nothing 1658 break; 1659 case HCI_POWER_OFF: 1660 // no connections yet, just turn it off 1661 hci_power_control_off(); 1662 break; 1663 case HCI_POWER_SLEEP: 1664 // no connections yet, just turn it off 1665 hci_power_control_sleep(); 1666 break; 1667 } 1668 break; 1669 1670 case HCI_STATE_WORKING: 1671 switch (power_mode){ 1672 case HCI_POWER_ON: 1673 // do nothing 1674 break; 1675 case HCI_POWER_OFF: 1676 // see hci_run 1677 hci_stack->state = HCI_STATE_HALTING; 1678 break; 1679 case HCI_POWER_SLEEP: 1680 // see hci_run 1681 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1682 hci_stack->substate = 0; 1683 break; 1684 } 1685 break; 1686 1687 case HCI_STATE_HALTING: 1688 switch (power_mode){ 1689 case HCI_POWER_ON: 1690 hci_power_transition_to_initializing(); 1691 break; 1692 case HCI_POWER_OFF: 1693 // do nothing 1694 break; 1695 case HCI_POWER_SLEEP: 1696 // see hci_run 1697 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1698 hci_stack->substate = 0; 1699 break; 1700 } 1701 break; 1702 1703 case HCI_STATE_FALLING_ASLEEP: 1704 switch (power_mode){ 1705 case HCI_POWER_ON: 1706 1707 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1708 // nothing to do, if H4 supports power management 1709 if (bt_control_iphone_power_management_enabled()){ 1710 hci_stack->state = HCI_STATE_INITIALIZING; 1711 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1712 break; 1713 } 1714 #endif 1715 hci_power_transition_to_initializing(); 1716 break; 1717 case HCI_POWER_OFF: 1718 // see hci_run 1719 hci_stack->state = HCI_STATE_HALTING; 1720 break; 1721 case HCI_POWER_SLEEP: 1722 // do nothing 1723 break; 1724 } 1725 break; 1726 1727 case HCI_STATE_SLEEPING: 1728 switch (power_mode){ 1729 case HCI_POWER_ON: 1730 1731 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1732 // nothing to do, if H4 supports power management 1733 if (bt_control_iphone_power_management_enabled()){ 1734 hci_stack->state = HCI_STATE_INITIALIZING; 1735 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1736 hci_update_scan_enable(); 1737 break; 1738 } 1739 #endif 1740 err = hci_power_control_wake(); 1741 if (err) return err; 1742 hci_power_transition_to_initializing(); 1743 break; 1744 case HCI_POWER_OFF: 1745 hci_stack->state = HCI_STATE_HALTING; 1746 break; 1747 case HCI_POWER_SLEEP: 1748 // do nothing 1749 break; 1750 } 1751 break; 1752 } 1753 1754 // create internal event 1755 hci_emit_state(); 1756 1757 // trigger next/first action 1758 hci_run(); 1759 1760 return 0; 1761 } 1762 1763 static void hci_update_scan_enable(void){ 1764 // 2 = page scan, 1 = inq scan 1765 hci_stack->new_scan_enable_value = hci_stack->connectable << 1 | hci_stack->discoverable; 1766 hci_run(); 1767 } 1768 1769 void hci_discoverable_control(uint8_t enable){ 1770 if (enable) enable = 1; // normalize argument 1771 1772 if (hci_stack->discoverable == enable){ 1773 hci_emit_discoverable_enabled(hci_stack->discoverable); 1774 return; 1775 } 1776 1777 hci_stack->discoverable = enable; 1778 hci_update_scan_enable(); 1779 } 1780 1781 void hci_connectable_control(uint8_t enable){ 1782 if (enable) enable = 1; // normalize argument 1783 1784 // don't emit event 1785 if (hci_stack->connectable == enable) return; 1786 1787 hci_stack->connectable = enable; 1788 hci_update_scan_enable(); 1789 } 1790 1791 bd_addr_t * hci_local_bd_addr(void){ 1792 return &hci_stack->local_bd_addr; 1793 } 1794 1795 void hci_run(){ 1796 1797 hci_connection_t * connection; 1798 linked_item_t * it; 1799 1800 // send continuation fragments first, as they block the prepared packet buffer 1801 if (hci_stack->acl_fragmentation_total_size > 0) { 1802 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(hci_stack->hci_packet_buffer); 1803 if (hci_can_send_prepared_acl_packet_now(con_handle)){ 1804 hci_connection_t *connection = hci_connection_for_handle(con_handle); 1805 if (connection) { 1806 hci_send_acl_packet_fragments(connection); 1807 return; 1808 } 1809 // connection gone -> discard further fragments 1810 hci_stack->acl_fragmentation_total_size = 0; 1811 hci_stack->acl_fragmentation_pos = 0; 1812 } 1813 } 1814 1815 if (!hci_can_send_command_packet_now()) return; 1816 1817 // global/non-connection oriented commands 1818 1819 // decline incoming connections 1820 if (hci_stack->decline_reason){ 1821 uint8_t reason = hci_stack->decline_reason; 1822 hci_stack->decline_reason = 0; 1823 hci_send_cmd(&hci_reject_connection_request, hci_stack->decline_addr, reason); 1824 return; 1825 } 1826 1827 // send scan enable 1828 if (hci_stack->state == HCI_STATE_WORKING && hci_stack->new_scan_enable_value != 0xff && hci_classic_supported()){ 1829 hci_send_cmd(&hci_write_scan_enable, hci_stack->new_scan_enable_value); 1830 hci_stack->new_scan_enable_value = 0xff; 1831 return; 1832 } 1833 1834 #ifdef HAVE_BLE 1835 // handle le scan 1836 if (hci_stack->state == HCI_STATE_WORKING){ 1837 switch(hci_stack->le_scanning_state){ 1838 case LE_START_SCAN: 1839 hci_stack->le_scanning_state = LE_SCANNING; 1840 hci_send_cmd(&hci_le_set_scan_enable, 1, 0); 1841 return; 1842 1843 case LE_STOP_SCAN: 1844 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1845 hci_send_cmd(&hci_le_set_scan_enable, 0, 0); 1846 return; 1847 default: 1848 break; 1849 } 1850 if (hci_stack->le_scan_type != 0xff){ 1851 // defaults: active scanning, accept all advertisement packets 1852 int scan_type = hci_stack->le_scan_type; 1853 hci_stack->le_scan_type = 0xff; 1854 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); 1855 return; 1856 } 1857 } 1858 #endif 1859 1860 // send pending HCI commands 1861 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 1862 connection = (hci_connection_t *) it; 1863 1864 switch(connection->state){ 1865 case SEND_CREATE_CONNECTION: 1866 switch(connection->address_type){ 1867 case BD_ADDR_TYPE_CLASSIC: 1868 log_info("sending hci_create_connection"); 1869 hci_send_cmd(&hci_create_connection, connection->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 1870 break; 1871 default: 1872 #ifdef HAVE_BLE 1873 log_info("sending hci_le_create_connection"); 1874 hci_send_cmd(&hci_le_create_connection, 1875 0x0060, // scan interval: 60 ms 1876 0x0030, // scan interval: 30 ms 1877 0, // don't use whitelist 1878 connection->address_type, // peer address type 1879 connection->address, // peer bd addr 1880 hci_stack->adv_addr_type, // our addr type: 1881 0x0008, // conn interval min 1882 0x0018, // conn interval max 1883 0, // conn latency 1884 0x0048, // supervision timeout 1885 0x0001, // min ce length 1886 0x0001 // max ce length 1887 ); 1888 1889 connection->state = SENT_CREATE_CONNECTION; 1890 #endif 1891 break; 1892 } 1893 return; 1894 1895 case RECEIVED_CONNECTION_REQUEST: 1896 log_info("sending hci_accept_connection_request"); 1897 connection->state = ACCEPTED_CONNECTION_REQUEST; 1898 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 1899 return; 1900 1901 #ifdef HAVE_BLE 1902 case SEND_CANCEL_CONNECTION: 1903 connection->state = SENT_CANCEL_CONNECTION; 1904 hci_send_cmd(&hci_le_create_connection_cancel); 1905 return; 1906 #endif 1907 case SEND_DISCONNECT: 1908 connection->state = SENT_DISCONNECT; 1909 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1910 return; 1911 1912 default: 1913 break; 1914 } 1915 1916 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 1917 log_info("responding to link key request"); 1918 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 1919 link_key_t link_key; 1920 link_key_type_t link_key_type; 1921 if ( hci_stack->remote_device_db 1922 && hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type) 1923 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 1924 connection->link_key_type = link_key_type; 1925 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 1926 } else { 1927 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 1928 } 1929 return; 1930 } 1931 1932 if (connection->authentication_flags & DENY_PIN_CODE_REQUEST){ 1933 log_info("denying to pin request"); 1934 connectionClearAuthenticationFlags(connection, DENY_PIN_CODE_REQUEST); 1935 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 1936 return; 1937 } 1938 1939 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 1940 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 1941 log_info("IO Capability Request received, stack bondable %u, io cap %u", hci_stack->bondable, hci_stack->ssp_io_capability); 1942 if (hci_stack->bondable && (hci_stack->ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN)){ 1943 // tweak authentication requirements 1944 uint8_t authreq = hci_stack->ssp_authentication_requirement; 1945 if (connection->bonding_flags & BONDING_DEDICATED){ 1946 authreq = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING; 1947 } 1948 if (gap_mitm_protection_required_for_security_level(connection->requested_security_level)){ 1949 authreq |= 1; 1950 } 1951 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack->ssp_io_capability, NULL, authreq); 1952 } else { 1953 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 1954 } 1955 return; 1956 } 1957 1958 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 1959 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 1960 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 1961 return; 1962 } 1963 1964 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 1965 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 1966 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 1967 return; 1968 } 1969 1970 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 1971 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 1972 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 1973 return; 1974 } 1975 1976 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 1977 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 1978 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 1979 return; 1980 } 1981 if (connection->bonding_flags & BONDING_DISCONNECT_DEDICATED_DONE){ 1982 connection->bonding_flags &= ~BONDING_DISCONNECT_DEDICATED_DONE; 1983 connection->bonding_flags |= BONDING_EMIT_COMPLETE_ON_DISCONNECT; 1984 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // authentication done 1985 return; 1986 } 1987 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 1988 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 1989 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 1990 return; 1991 } 1992 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 1993 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 1994 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 1995 return; 1996 } 1997 1998 #ifdef HAVE_BLE 1999 if (connection->le_con_parameter_update_state == CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS){ 2000 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 2001 2002 uint16_t connection_interval_min = connection->le_conn_interval_min; 2003 connection->le_conn_interval_min = 0; 2004 hci_send_cmd(&hci_le_connection_update, connection->con_handle, connection_interval_min, 2005 connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout, 2006 0x0000, 0xffff); 2007 } 2008 #endif 2009 } 2010 2011 switch (hci_stack->state){ 2012 case HCI_STATE_INITIALIZING: 2013 hci_initializing_state_machine(); 2014 break; 2015 2016 case HCI_STATE_HALTING: 2017 2018 log_info("HCI_STATE_HALTING"); 2019 // close all open connections 2020 connection = (hci_connection_t *) hci_stack->connections; 2021 if (connection){ 2022 2023 // send disconnect 2024 if (!hci_can_send_command_packet_now()) return; 2025 2026 log_info("HCI_STATE_HALTING, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2027 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2028 2029 // send disconnected event right away - causes higher layer connections to get closed, too. 2030 hci_shutdown_connection(connection); 2031 return; 2032 } 2033 log_info("HCI_STATE_HALTING, calling off"); 2034 2035 // switch mode 2036 hci_power_control_off(); 2037 2038 log_info("HCI_STATE_HALTING, emitting state"); 2039 hci_emit_state(); 2040 log_info("HCI_STATE_HALTING, done"); 2041 break; 2042 2043 case HCI_STATE_FALLING_ASLEEP: 2044 switch(hci_stack->substate) { 2045 case 0: 2046 log_info("HCI_STATE_FALLING_ASLEEP"); 2047 // close all open connections 2048 connection = (hci_connection_t *) hci_stack->connections; 2049 2050 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2051 // don't close connections, if H4 supports power management 2052 if (bt_control_iphone_power_management_enabled()){ 2053 connection = NULL; 2054 } 2055 #endif 2056 if (connection){ 2057 2058 // send disconnect 2059 if (!hci_can_send_command_packet_now()) return; 2060 2061 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2062 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2063 2064 // send disconnected event right away - causes higher layer connections to get closed, too. 2065 hci_shutdown_connection(connection); 2066 return; 2067 } 2068 2069 if (hci_classic_supported()){ 2070 // disable page and inquiry scan 2071 if (!hci_can_send_command_packet_now()) return; 2072 2073 log_info("HCI_STATE_HALTING, disabling inq scans"); 2074 hci_send_cmd(&hci_write_scan_enable, hci_stack->connectable << 1); // drop inquiry scan but keep page scan 2075 2076 // continue in next sub state 2077 hci_stack->substate++; 2078 break; 2079 } 2080 // fall through for ble-only chips 2081 2082 case 2: 2083 log_info("HCI_STATE_HALTING, calling sleep"); 2084 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2085 // don't actually go to sleep, if H4 supports power management 2086 if (bt_control_iphone_power_management_enabled()){ 2087 // SLEEP MODE reached 2088 hci_stack->state = HCI_STATE_SLEEPING; 2089 hci_emit_state(); 2090 break; 2091 } 2092 #endif 2093 // switch mode 2094 hci_power_control_sleep(); // changes hci_stack->state to SLEEP 2095 hci_emit_state(); 2096 break; 2097 2098 default: 2099 break; 2100 } 2101 break; 2102 2103 default: 2104 break; 2105 } 2106 } 2107 2108 int hci_send_cmd_packet(uint8_t *packet, int size){ 2109 bd_addr_t addr; 2110 hci_connection_t * conn; 2111 // house-keeping 2112 2113 // create_connection? 2114 if (IS_COMMAND(packet, hci_create_connection)){ 2115 bt_flip_addr(addr, &packet[3]); 2116 log_info("Create_connection to %s", bd_addr_to_str(addr)); 2117 2118 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2119 if (!conn){ 2120 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2121 if (!conn){ 2122 // notify client that alloc failed 2123 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 2124 return 0; // don't sent packet to controller 2125 } 2126 conn->state = SEND_CREATE_CONNECTION; 2127 } 2128 log_info("conn state %u", conn->state); 2129 switch (conn->state){ 2130 // if connection active exists 2131 case OPEN: 2132 // and OPEN, emit connection complete command, don't send to controller 2133 hci_emit_connection_complete(conn, 0); 2134 return 0; 2135 case SEND_CREATE_CONNECTION: 2136 // connection created by hci, e.g. dedicated bonding 2137 break; 2138 default: 2139 // otherwise, just ignore as it is already in the open process 2140 return 0; 2141 } 2142 conn->state = SENT_CREATE_CONNECTION; 2143 } 2144 2145 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 2146 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 2147 } 2148 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 2149 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 2150 } 2151 2152 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 2153 if (hci_stack->remote_device_db){ 2154 bt_flip_addr(addr, &packet[3]); 2155 hci_stack->remote_device_db->delete_link_key(&addr); 2156 } 2157 } 2158 2159 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply) 2160 || IS_COMMAND(packet, hci_pin_code_request_reply)){ 2161 bt_flip_addr(addr, &packet[3]); 2162 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2163 if (conn){ 2164 connectionClearAuthenticationFlags(conn, LEGACY_PAIRING_ACTIVE); 2165 } 2166 } 2167 2168 if (IS_COMMAND(packet, hci_user_confirmation_request_negative_reply) 2169 || IS_COMMAND(packet, hci_user_confirmation_request_reply) 2170 || IS_COMMAND(packet, hci_user_passkey_request_negative_reply) 2171 || IS_COMMAND(packet, hci_user_passkey_request_reply)) { 2172 bt_flip_addr(addr, &packet[3]); 2173 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2174 if (conn){ 2175 connectionClearAuthenticationFlags(conn, SSP_PAIRING_ACTIVE); 2176 } 2177 } 2178 2179 #ifdef HAVE_BLE 2180 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 2181 hci_stack->adv_addr_type = packet[8]; 2182 } 2183 if (IS_COMMAND(packet, hci_le_set_random_address)){ 2184 bt_flip_addr(hci_stack->adv_address, &packet[3]); 2185 } 2186 #endif 2187 2188 hci_stack->num_cmd_packets--; 2189 2190 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, packet, size); 2191 int err = hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 2192 2193 // release packet buffer for synchronous transport implementations 2194 if (hci_transport_synchronous() && (packet == hci_stack->hci_packet_buffer)){ 2195 hci_stack->hci_packet_buffer_reserved = 0; 2196 } 2197 2198 return err; 2199 } 2200 2201 // disconnect because of security block 2202 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 2203 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2204 if (!connection) return; 2205 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 2206 } 2207 2208 2209 // Configure Secure Simple Pairing 2210 2211 // enable will enable SSP during init 2212 void hci_ssp_set_enable(int enable){ 2213 hci_stack->ssp_enable = enable; 2214 } 2215 2216 int hci_local_ssp_activated(){ 2217 return hci_ssp_supported() && hci_stack->ssp_enable; 2218 } 2219 2220 // if set, BTstack will respond to io capability request using authentication requirement 2221 void hci_ssp_set_io_capability(int io_capability){ 2222 hci_stack->ssp_io_capability = io_capability; 2223 } 2224 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 2225 hci_stack->ssp_authentication_requirement = authentication_requirement; 2226 } 2227 2228 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 2229 void hci_ssp_set_auto_accept(int auto_accept){ 2230 hci_stack->ssp_auto_accept = auto_accept; 2231 } 2232 2233 /** 2234 * pre: numcmds >= 0 - it's allowed to send a command to the controller 2235 */ 2236 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 2237 2238 if (!hci_can_send_command_packet_now()){ 2239 log_error("hci_send_cmd called but cannot send packet now"); 2240 return 0; 2241 } 2242 2243 // for HCI INITIALIZATION 2244 // log_info("hci_send_cmd: opcode %04x", cmd->opcode); 2245 hci_stack->last_cmd_opcode = cmd->opcode; 2246 2247 hci_reserve_packet_buffer(); 2248 uint8_t * packet = hci_stack->hci_packet_buffer; 2249 2250 va_list argptr; 2251 va_start(argptr, cmd); 2252 uint16_t size = hci_create_cmd_internal(packet, cmd, argptr); 2253 va_end(argptr); 2254 2255 return hci_send_cmd_packet(packet, size); 2256 } 2257 2258 // Create various non-HCI events. 2259 // TODO: generalize, use table similar to hci_create_command 2260 2261 void hci_emit_state(){ 2262 log_info("BTSTACK_EVENT_STATE %u", hci_stack->state); 2263 uint8_t event[3]; 2264 event[0] = BTSTACK_EVENT_STATE; 2265 event[1] = sizeof(event) - 2; 2266 event[2] = hci_stack->state; 2267 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2268 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2269 } 2270 2271 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 2272 uint8_t event[13]; 2273 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 2274 event[1] = sizeof(event) - 2; 2275 event[2] = status; 2276 bt_store_16(event, 3, conn->con_handle); 2277 bt_flip_addr(&event[5], conn->address); 2278 event[11] = 1; // ACL connection 2279 event[12] = 0; // encryption disabled 2280 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2281 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2282 } 2283 2284 void hci_emit_le_connection_complete(uint8_t address_type, bd_addr_t * address, uint16_t conn_handle, uint8_t status){ 2285 uint8_t event[21]; 2286 event[0] = HCI_EVENT_LE_META; 2287 event[1] = sizeof(event) - 2; 2288 event[2] = HCI_SUBEVENT_LE_CONNECTION_COMPLETE; 2289 event[3] = status; 2290 bt_store_16(event, 4, conn_handle); 2291 event[6] = 0; // TODO: role 2292 event[7] = address_type; 2293 bt_flip_addr(&event[8], *address); 2294 bt_store_16(event, 14, 0); // interval 2295 bt_store_16(event, 16, 0); // latency 2296 bt_store_16(event, 18, 0); // supervision timeout 2297 event[20] = 0; // master clock accuracy 2298 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2299 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2300 } 2301 2302 void hci_emit_disconnection_complete(uint16_t handle, uint8_t reason){ 2303 uint8_t event[6]; 2304 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 2305 event[1] = sizeof(event) - 2; 2306 event[2] = 0; // status = OK 2307 bt_store_16(event, 3, handle); 2308 event[5] = reason; 2309 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2310 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2311 } 2312 2313 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 2314 if (disable_l2cap_timeouts) return; 2315 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 2316 uint8_t event[4]; 2317 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 2318 event[1] = sizeof(event) - 2; 2319 bt_store_16(event, 2, conn->con_handle); 2320 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2321 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2322 } 2323 2324 void hci_emit_nr_connections_changed(){ 2325 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 2326 uint8_t event[3]; 2327 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 2328 event[1] = sizeof(event) - 2; 2329 event[2] = nr_hci_connections(); 2330 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2331 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2332 } 2333 2334 void hci_emit_hci_open_failed(){ 2335 log_info("BTSTACK_EVENT_POWERON_FAILED"); 2336 uint8_t event[2]; 2337 event[0] = BTSTACK_EVENT_POWERON_FAILED; 2338 event[1] = sizeof(event) - 2; 2339 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2340 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2341 } 2342 2343 #ifndef EMBEDDED 2344 void hci_emit_btstack_version() { 2345 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 2346 uint8_t event[6]; 2347 event[0] = BTSTACK_EVENT_VERSION; 2348 event[1] = sizeof(event) - 2; 2349 event[2] = BTSTACK_MAJOR; 2350 event[3] = BTSTACK_MINOR; 2351 bt_store_16(event, 4, BTSTACK_REVISION); 2352 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2353 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2354 } 2355 #endif 2356 2357 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 2358 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 2359 uint8_t event[3]; 2360 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 2361 event[1] = sizeof(event) - 2; 2362 event[2] = enabled; 2363 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2364 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2365 } 2366 2367 void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){ 2368 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 2369 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 2370 event[1] = sizeof(event) - 2 - 1; 2371 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 2372 bt_flip_addr(&event[3], *addr); 2373 memcpy(&event[9], name, 248); 2374 2375 event[9+248] = 0; // assert \0 for log_info 2376 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(*addr), &event[9]); 2377 2378 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 2379 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 2380 } 2381 2382 void hci_emit_discoverable_enabled(uint8_t enabled){ 2383 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 2384 uint8_t event[3]; 2385 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 2386 event[1] = sizeof(event) - 2; 2387 event[2] = enabled; 2388 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2389 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2390 } 2391 2392 void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){ 2393 log_info("hci_emit_security_level %u for handle %x", level, con_handle); 2394 uint8_t event[5]; 2395 int pos = 0; 2396 event[pos++] = GAP_SECURITY_LEVEL; 2397 event[pos++] = sizeof(event) - 2; 2398 bt_store_16(event, 2, con_handle); 2399 pos += 2; 2400 event[pos++] = level; 2401 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2402 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2403 } 2404 2405 void hci_emit_dedicated_bonding_result(bd_addr_t address, uint8_t status){ 2406 log_info("hci_emit_dedicated_bonding_result %u ", status); 2407 uint8_t event[9]; 2408 int pos = 0; 2409 event[pos++] = GAP_DEDICATED_BONDING_COMPLETED; 2410 event[pos++] = sizeof(event) - 2; 2411 event[pos++] = status; 2412 bt_flip_addr( * (bd_addr_t *) &event[pos], address); 2413 pos += 6; 2414 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2415 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2416 } 2417 2418 // query if remote side supports SSP 2419 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 2420 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2421 if (!connection) return 0; 2422 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 2423 } 2424 2425 int hci_ssp_supported_on_both_sides(hci_con_handle_t handle){ 2426 return hci_local_ssp_activated() && hci_remote_ssp_supported(handle); 2427 } 2428 2429 // GAP API 2430 /** 2431 * @bbrief enable/disable bonding. default is enabled 2432 * @praram enabled 2433 */ 2434 void gap_set_bondable_mode(int enable){ 2435 hci_stack->bondable = enable ? 1 : 0; 2436 } 2437 2438 /** 2439 * @brief map link keys to security levels 2440 */ 2441 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 2442 switch (link_key_type){ 2443 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 2444 return LEVEL_4; 2445 case COMBINATION_KEY: 2446 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 2447 return LEVEL_3; 2448 default: 2449 return LEVEL_2; 2450 } 2451 } 2452 2453 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 2454 if (!connection) return LEVEL_0; 2455 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 2456 return gap_security_level_for_link_key_type(connection->link_key_type); 2457 } 2458 2459 2460 int gap_mitm_protection_required_for_security_level(gap_security_level_t level){ 2461 log_info("gap_mitm_protection_required_for_security_level %u", level); 2462 return level > LEVEL_2; 2463 } 2464 2465 /** 2466 * @brief get current security level 2467 */ 2468 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 2469 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2470 if (!connection) return LEVEL_0; 2471 return gap_security_level_for_connection(connection); 2472 } 2473 2474 /** 2475 * @brief request connection to device to 2476 * @result GAP_AUTHENTICATION_RESULT 2477 */ 2478 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 2479 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2480 if (!connection){ 2481 hci_emit_security_level(con_handle, LEVEL_0); 2482 return; 2483 } 2484 gap_security_level_t current_level = gap_security_level(con_handle); 2485 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 2486 if (current_level >= requested_level){ 2487 hci_emit_security_level(con_handle, current_level); 2488 return; 2489 } 2490 2491 connection->requested_security_level = requested_level; 2492 2493 #if 0 2494 // sending encryption request without a link key results in an error. 2495 // TODO: figure out how to use it properly 2496 2497 // would enabling ecnryption suffice (>= LEVEL_2)? 2498 if (hci_stack->remote_device_db){ 2499 link_key_type_t link_key_type; 2500 link_key_t link_key; 2501 if (hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type)){ 2502 if (gap_security_level_for_link_key_type(link_key_type) >= requested_level){ 2503 connection->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 2504 return; 2505 } 2506 } 2507 } 2508 #endif 2509 2510 // try to authenticate connection 2511 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 2512 hci_run(); 2513 } 2514 2515 /** 2516 * @brief start dedicated bonding with device. disconnect after bonding 2517 * @param device 2518 * @param request MITM protection 2519 * @result GAP_DEDICATED_BONDING_COMPLETE 2520 */ 2521 int gap_dedicated_bonding(bd_addr_t device, int mitm_protection_required){ 2522 2523 // create connection state machine 2524 hci_connection_t * connection = create_connection_for_bd_addr_and_type(device, BD_ADDR_TYPE_CLASSIC); 2525 2526 if (!connection){ 2527 return BTSTACK_MEMORY_ALLOC_FAILED; 2528 } 2529 2530 // delete linkn key 2531 hci_drop_link_key_for_bd_addr( (bd_addr_t *) &device); 2532 2533 // configure LEVEL_2/3, dedicated bonding 2534 connection->state = SEND_CREATE_CONNECTION; 2535 connection->requested_security_level = mitm_protection_required ? LEVEL_3 : LEVEL_2; 2536 log_info("gap_dedicated_bonding, mitm %u -> level %u", mitm_protection_required, connection->requested_security_level); 2537 connection->bonding_flags = BONDING_DEDICATED; 2538 2539 // wait for GAP Security Result and send GAP Dedicated Bonding complete 2540 2541 // handle: connnection failure (connection complete != ok) 2542 // handle: authentication failure 2543 // handle: disconnect on done 2544 2545 hci_run(); 2546 2547 return 0; 2548 } 2549 2550 void gap_set_local_name(const char * local_name){ 2551 hci_stack->local_name = local_name; 2552 } 2553 2554 le_command_status_t le_central_start_scan(){ 2555 if (hci_stack->le_scanning_state == LE_SCANNING) return BLE_PERIPHERAL_OK; 2556 hci_stack->le_scanning_state = LE_START_SCAN; 2557 hci_run(); 2558 return BLE_PERIPHERAL_OK; 2559 } 2560 2561 le_command_status_t le_central_stop_scan(){ 2562 if ( hci_stack->le_scanning_state == LE_SCAN_IDLE) return BLE_PERIPHERAL_OK; 2563 hci_stack->le_scanning_state = LE_STOP_SCAN; 2564 hci_run(); 2565 return BLE_PERIPHERAL_OK; 2566 } 2567 2568 void le_central_set_scan_parameters(uint8_t scan_type, uint16_t scan_interval, uint16_t scan_window){ 2569 hci_stack->le_scan_type = scan_type; 2570 hci_stack->le_scan_interval = scan_interval; 2571 hci_stack->le_scan_window = scan_window; 2572 hci_run(); 2573 } 2574 2575 le_command_status_t le_central_connect(bd_addr_t * addr, bd_addr_type_t addr_type){ 2576 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 2577 if (!conn){ 2578 log_info("le_central_connect: no connection exists yet, creating context"); 2579 conn = create_connection_for_bd_addr_and_type(*addr, addr_type); 2580 if (!conn){ 2581 // notify client that alloc failed 2582 hci_emit_le_connection_complete(addr_type, addr, 0, BTSTACK_MEMORY_ALLOC_FAILED); 2583 log_info("le_central_connect: failed to alloc hci_connection_t"); 2584 return BLE_PERIPHERAL_NOT_CONNECTED; // don't sent packet to controller 2585 } 2586 conn->state = SEND_CREATE_CONNECTION; 2587 log_info("le_central_connect: send create connection next"); 2588 hci_run(); 2589 return BLE_PERIPHERAL_OK; 2590 } 2591 2592 if (!hci_is_le_connection(conn) || 2593 conn->state == SEND_CREATE_CONNECTION || 2594 conn->state == SENT_CREATE_CONNECTION) { 2595 hci_emit_le_connection_complete(conn->address_type, &conn->address, 0, ERROR_CODE_COMMAND_DISALLOWED); 2596 log_error("le_central_connect: classic connection or connect is already being created"); 2597 return BLE_PERIPHERAL_IN_WRONG_STATE; 2598 } 2599 2600 log_info("le_central_connect: context exists with state %u", conn->state); 2601 hci_emit_le_connection_complete(conn->address_type, &conn->address, conn->con_handle, 0); 2602 hci_run(); 2603 return BLE_PERIPHERAL_OK; 2604 } 2605 2606 // @assumption: only a single outgoing LE Connection exists 2607 static hci_connection_t * le_central_get_outgoing_connection(){ 2608 linked_item_t *it; 2609 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 2610 hci_connection_t * conn = (hci_connection_t *) it; 2611 if (!hci_is_le_connection(conn)) continue; 2612 switch (conn->state){ 2613 case SEND_CREATE_CONNECTION: 2614 case SENT_CREATE_CONNECTION: 2615 return conn; 2616 default: 2617 break; 2618 }; 2619 } 2620 return NULL; 2621 } 2622 2623 le_command_status_t le_central_connect_cancel(){ 2624 hci_connection_t * conn = le_central_get_outgoing_connection(); 2625 switch (conn->state){ 2626 case SEND_CREATE_CONNECTION: 2627 // skip sending create connection and emit event instead 2628 hci_emit_le_connection_complete(conn->address_type, &conn->address, 0, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 2629 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 2630 btstack_memory_hci_connection_free( conn ); 2631 break; 2632 case SENT_CREATE_CONNECTION: 2633 // request to send cancel connection 2634 conn->state = SEND_CANCEL_CONNECTION; 2635 hci_run(); 2636 break; 2637 default: 2638 break; 2639 } 2640 return BLE_PERIPHERAL_OK; 2641 } 2642 2643 /** 2644 * @brief Updates the connection parameters for a given LE connection 2645 * @param handle 2646 * @param conn_interval_min (unit: 1.25ms) 2647 * @param conn_interval_max (unit: 1.25ms) 2648 * @param conn_latency 2649 * @param supervision_timeout (unit: 10ms) 2650 * @returns 0 if ok 2651 */ 2652 int gap_update_connection_parameters(hci_con_handle_t con_handle, uint16_t conn_interval_min, 2653 uint16_t conn_interval_max, uint16_t conn_latency, uint16_t supervision_timeout){ 2654 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2655 if (!connection) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2656 connection->le_conn_interval_min = conn_interval_min; 2657 connection->le_conn_interval_max = conn_interval_max; 2658 connection->le_conn_latency = conn_latency; 2659 connection->le_supervision_timeout = supervision_timeout; 2660 return 0; 2661 } 2662 2663 le_command_status_t gap_disconnect(hci_con_handle_t handle){ 2664 hci_connection_t * conn = hci_connection_for_handle(handle); 2665 if (!conn){ 2666 hci_emit_disconnection_complete(handle, 0); 2667 return BLE_PERIPHERAL_OK; 2668 } 2669 conn->state = SEND_DISCONNECT; 2670 hci_run(); 2671 return BLE_PERIPHERAL_OK; 2672 } 2673 2674 void hci_disconnect_all(){ 2675 linked_list_iterator_t it; 2676 linked_list_iterator_init(&it, &hci_stack->connections); 2677 while (linked_list_iterator_has_next(&it)){ 2678 hci_connection_t * con = (hci_connection_t*) linked_list_iterator_next(&it); 2679 if (con->state == SENT_DISCONNECT) continue; 2680 con->state = SEND_DISCONNECT; 2681 } 2682 hci_run(); 2683 } 2684