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); 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); 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 // log_info("hci_init: substate %u", hci_stack->substate); 788 if (hci_stack->substate % 2) { 789 // odd: waiting for command completion 790 return; 791 } 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 = 4; // >> 1 = 2 800 } 801 break; 802 case 1: // SEND BAUD CHANGE 803 hci_stack->control->baudrate_cmd(hci_stack->config, ((hci_uart_config_t *)hci_stack->config)->baudrate_main, hci_stack->hci_packet_buffer); 804 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 805 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 806 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 807 break; 808 case 2: // LOCAL BAUD CHANGE 809 log_info("Local baud rate change"); 810 hci_stack->hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack->config)->baudrate_main); 811 hci_stack->substate += 2; 812 // break missing here for fall through 813 814 case 3: 815 log_info("Custom init"); 816 // Custom initialization 817 if (hci_stack->control && hci_stack->control->next_cmd){ 818 int valid_cmd = (*hci_stack->control->next_cmd)(hci_stack->config, hci_stack->hci_packet_buffer); 819 if (valid_cmd){ 820 int size = 3 + hci_stack->hci_packet_buffer[2]; 821 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 822 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, hci_stack->hci_packet_buffer, size); 823 hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack->hci_packet_buffer, size); 824 hci_stack->substate = 4; // more init commands 825 break; 826 } 827 log_info("hci_run: init script done"); 828 } 829 // otherwise continue 830 hci_send_cmd(&hci_read_bd_addr); 831 break; 832 case 4: 833 hci_send_cmd(&hci_read_buffer_size); 834 break; 835 case 5: 836 hci_send_cmd(&hci_read_local_supported_features); 837 break; 838 case 6: 839 if (hci_le_supported()){ 840 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 841 } else { 842 // Kensington Bluetoot 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 843 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 844 } 845 846 // skip Classic init commands for LE only chipsets 847 if (!hci_classic_supported()){ 848 if (hci_le_supported()){ 849 hci_stack->substate = 11 << 1; // skip all classic command 850 } else { 851 log_error("Neither BR/EDR nor LE supported"); 852 hci_stack->substate = 14 << 1; // skip all 853 } 854 } 855 break; 856 case 7: 857 if (hci_ssp_supported()){ 858 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack->ssp_enable); 859 break; 860 } 861 hci_stack->substate += 2; 862 // break missing here for fall through 863 864 case 8: 865 // ca. 15 sec 866 hci_send_cmd(&hci_write_page_timeout, 0x6000); 867 break; 868 case 9: 869 hci_send_cmd(&hci_write_class_of_device, hci_stack->class_of_device); 870 break; 871 case 10: 872 if (hci_stack->local_name){ 873 hci_send_cmd(&hci_write_local_name, hci_stack->local_name); 874 } else { 875 char hostname[30]; 876 #ifdef EMBEDDED 877 // BTstack-11:22:33:44:55:66 878 strcpy(hostname, "BTstack "); 879 strcat(hostname, bd_addr_to_str(hci_stack->local_bd_addr)); 880 log_info("---> Name %s", hostname); 881 #else 882 // hostname for POSIX systems 883 gethostname(hostname, 30); 884 hostname[29] = '\0'; 885 #endif 886 hci_send_cmd(&hci_write_local_name, hostname); 887 } 888 break; 889 case 11: 890 hci_send_cmd(&hci_write_scan_enable, (hci_stack->connectable << 1) | hci_stack->discoverable); // page scan 891 if (!hci_le_supported()){ 892 // SKIP LE init for Classic only configuration 893 hci_stack->substate = 14 << 1; 894 } 895 break; 896 897 #ifdef HAVE_BLE 898 // LE INIT 899 case 12: 900 hci_send_cmd(&hci_le_read_buffer_size); 901 break; 902 case 13: 903 // LE Supported Host = 1, Simultaneous Host = 0 904 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 905 break; 906 case 14: 907 // LE Scan Parameters: active scanning, 300 ms interval, 30 ms window, public address, accept all advs 908 hci_send_cmd(&hci_le_set_scan_parameters, 1, 0x1e0, 0x30, 0, 0); 909 break; 910 #endif 911 912 // DONE 913 case 15: 914 // done. 915 hci_stack->state = HCI_STATE_WORKING; 916 hci_emit_state(); 917 break; 918 default: 919 break; 920 } 921 hci_stack->substate++; 922 } 923 924 // avoid huge local variables 925 #ifndef EMBEDDED 926 static device_name_t device_name; 927 #endif 928 static void event_handler(uint8_t *packet, int size){ 929 930 uint16_t event_length = packet[1]; 931 932 // assert packet is complete 933 if (size != event_length + 2){ 934 log_error("hci.c: event_handler called with event packet of wrong size %u, expected %u => dropping packet", size, event_length + 2); 935 return; 936 } 937 938 bd_addr_t addr; 939 bd_addr_type_t addr_type; 940 uint8_t link_type; 941 hci_con_handle_t handle; 942 hci_connection_t * conn; 943 int i; 944 945 // log_info("HCI:EVENT:%02x", packet[0]); 946 947 switch (packet[0]) { 948 949 case HCI_EVENT_COMMAND_COMPLETE: 950 // get num cmd packets 951 // log_info("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u", hci_stack->num_cmd_packets, packet[2]); 952 hci_stack->num_cmd_packets = packet[2]; 953 954 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 955 // from offset 5 956 // status 957 // "The HC_ACL_Data_Packet_Length return parameter will be used to determine the size of the L2CAP segments contained in ACL Data Packets" 958 hci_stack->acl_data_packet_length = READ_BT_16(packet, 6); 959 // ignore: SCO data packet len (8) 960 hci_stack->acl_packets_total_num = packet[9]; 961 // ignore: total num SCO packets 962 if (hci_stack->state == HCI_STATE_INITIALIZING){ 963 // determine usable ACL payload size 964 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->acl_data_packet_length){ 965 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 966 } 967 log_info("hci_read_buffer_size: used size %u, count %u", 968 hci_stack->acl_data_packet_length, hci_stack->acl_packets_total_num); 969 } 970 } 971 #ifdef HAVE_BLE 972 if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_buffer_size)){ 973 hci_stack->le_data_packets_length = READ_BT_16(packet, 6); 974 hci_stack->le_acl_packets_total_num = packet[8]; 975 // determine usable ACL payload size 976 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->le_data_packets_length){ 977 hci_stack->le_data_packets_length = HCI_ACL_PAYLOAD_SIZE; 978 } 979 log_info("hci_le_read_buffer_size: size %u, count %u", hci_stack->le_data_packets_length, hci_stack->le_acl_packets_total_num); 980 } 981 #endif 982 // Dump local address 983 if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)) { 984 bt_flip_addr(hci_stack->local_bd_addr, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1]); 985 log_info("Local Address, Status: 0x%02x: Addr: %s", 986 packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE], bd_addr_to_str(hci_stack->local_bd_addr)); 987 } 988 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 989 hci_emit_discoverable_enabled(hci_stack->discoverable); 990 } 991 // Note: HCI init checks 992 if (COMMAND_COMPLETE_EVENT(packet, hci_read_local_supported_features)){ 993 memcpy(hci_stack->local_supported_features, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1], 8); 994 log_info("Local Supported Features: 0x%02x%02x%02x%02x%02x%02x%02x%02x", 995 hci_stack->local_supported_features[0], hci_stack->local_supported_features[1], 996 hci_stack->local_supported_features[2], hci_stack->local_supported_features[3], 997 hci_stack->local_supported_features[4], hci_stack->local_supported_features[5], 998 hci_stack->local_supported_features[6], hci_stack->local_supported_features[7]); 999 1000 // determine usable ACL packet types based on host buffer size and supported features 1001 hci_stack->packet_types = hci_acl_packet_types_for_buffer_size_and_local_features(HCI_ACL_PAYLOAD_SIZE, &hci_stack->local_supported_features[0]); 1002 log_info("packet types %04x", hci_stack->packet_types); 1003 1004 // Classic/LE 1005 log_info("BR/EDR support %u, LE support %u", hci_classic_supported(), hci_le_supported()); 1006 } 1007 break; 1008 1009 case HCI_EVENT_COMMAND_STATUS: 1010 // get num cmd packets 1011 // log_info("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u", hci_stack->num_cmd_packets, packet[3]); 1012 hci_stack->num_cmd_packets = packet[3]; 1013 break; 1014 1015 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:{ 1016 int offset = 3; 1017 for (i=0; i<packet[2];i++){ 1018 handle = READ_BT_16(packet, offset); 1019 offset += 2; 1020 uint16_t num_packets = READ_BT_16(packet, offset); 1021 offset += 2; 1022 1023 conn = hci_connection_for_handle(handle); 1024 if (!conn){ 1025 log_error("hci_number_completed_packet lists unused con handle %u", handle); 1026 continue; 1027 } 1028 1029 if (conn->num_acl_packets_sent >= num_packets){ 1030 conn->num_acl_packets_sent -= num_packets; 1031 } else { 1032 log_error("hci_number_completed_packets, more slots freed then sent."); 1033 conn->num_acl_packets_sent = 0; 1034 } 1035 // log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u", num_packets, handle, conn->num_acl_packets_sent); 1036 } 1037 break; 1038 } 1039 case HCI_EVENT_CONNECTION_REQUEST: 1040 bt_flip_addr(addr, &packet[2]); 1041 // TODO: eval COD 8-10 1042 link_type = packet[11]; 1043 log_info("Connection_incoming: %s, type %u", bd_addr_to_str(addr), link_type); 1044 if (link_type == 1) { // ACL 1045 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1046 if (!conn) { 1047 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 1048 } 1049 if (!conn) { 1050 // CONNECTION REJECTED DUE TO LIMITED RESOURCES (0X0D) 1051 hci_stack->decline_reason = 0x0d; 1052 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1053 break; 1054 } 1055 conn->state = RECEIVED_CONNECTION_REQUEST; 1056 hci_run(); 1057 } else { 1058 // SYNCHRONOUS CONNECTION LIMIT TO A DEVICE EXCEEDED (0X0A) 1059 hci_stack->decline_reason = 0x0a; 1060 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1061 } 1062 break; 1063 1064 case HCI_EVENT_CONNECTION_COMPLETE: 1065 // Connection management 1066 bt_flip_addr(addr, &packet[5]); 1067 log_info("Connection_complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 1068 addr_type = BD_ADDR_TYPE_CLASSIC; 1069 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1070 if (conn) { 1071 if (!packet[2]){ 1072 conn->state = OPEN; 1073 conn->con_handle = READ_BT_16(packet, 3); 1074 conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES; 1075 1076 // restart timer 1077 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1078 run_loop_add_timer(&conn->timeout); 1079 1080 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1081 1082 hci_emit_nr_connections_changed(); 1083 } else { 1084 int notify_dedicated_bonding_failed = conn->bonding_flags & BONDING_DEDICATED; 1085 uint8_t status = packet[2]; 1086 bd_addr_t bd_address; 1087 memcpy(&bd_address, conn->address, 6); 1088 1089 // connection failed, remove entry 1090 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1091 btstack_memory_hci_connection_free( conn ); 1092 1093 // notify client if dedicated bonding 1094 if (notify_dedicated_bonding_failed){ 1095 log_info("hci notify_dedicated_bonding_failed"); 1096 hci_emit_dedicated_bonding_result(bd_address, status); 1097 } 1098 1099 // if authentication error, also delete link key 1100 if (packet[2] == 0x05) { 1101 hci_drop_link_key_for_bd_addr(&addr); 1102 } 1103 } 1104 } 1105 break; 1106 1107 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 1108 handle = READ_BT_16(packet, 3); 1109 conn = hci_connection_for_handle(handle); 1110 if (!conn) break; 1111 if (!packet[2]){ 1112 uint8_t * features = &packet[5]; 1113 if (features[6] & (1 << 3)){ 1114 conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP; 1115 } 1116 } 1117 conn->bonding_flags |= BONDING_RECEIVED_REMOTE_FEATURES; 1118 log_info("HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE, bonding flags %x", conn->bonding_flags); 1119 if (conn->bonding_flags & BONDING_DEDICATED){ 1120 conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 1121 } 1122 break; 1123 1124 case HCI_EVENT_LINK_KEY_REQUEST: 1125 log_info("HCI_EVENT_LINK_KEY_REQUEST"); 1126 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 1127 // non-bondable mode: link key negative reply will be sent by HANDLE_LINK_KEY_REQUEST 1128 if (hci_stack->bondable && !hci_stack->remote_device_db) break; 1129 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], HANDLE_LINK_KEY_REQUEST); 1130 hci_run(); 1131 // request handled by hci_run() as HANDLE_LINK_KEY_REQUEST gets set 1132 return; 1133 1134 case HCI_EVENT_LINK_KEY_NOTIFICATION: { 1135 bt_flip_addr(addr, &packet[2]); 1136 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1137 if (!conn) break; 1138 conn->authentication_flags |= RECV_LINK_KEY_NOTIFICATION; 1139 link_key_type_t link_key_type = (link_key_type_t)packet[24]; 1140 // Change Connection Encryption keeps link key type 1141 if (link_key_type != CHANGED_COMBINATION_KEY){ 1142 conn->link_key_type = link_key_type; 1143 } 1144 if (!hci_stack->remote_device_db) break; 1145 hci_stack->remote_device_db->put_link_key(&addr, (link_key_t *) &packet[8], conn->link_key_type); 1146 // still forward event to allow dismiss of pairing dialog 1147 break; 1148 } 1149 1150 case HCI_EVENT_PIN_CODE_REQUEST: 1151 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], LEGACY_PAIRING_ACTIVE); 1152 // non-bondable mode: pin code negative reply will be sent 1153 if (!hci_stack->bondable){ 1154 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], DENY_PIN_CODE_REQUEST); 1155 hci_run(); 1156 return; 1157 } 1158 // PIN CODE REQUEST means the link key request didn't succee -> delete stored link key 1159 if (!hci_stack->remote_device_db) break; 1160 bt_flip_addr(addr, &packet[2]); 1161 hci_stack->remote_device_db->delete_link_key(&addr); 1162 break; 1163 1164 case HCI_EVENT_IO_CAPABILITY_REQUEST: 1165 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_IO_CAPABILITIES_REQUEST); 1166 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_IO_CAPABILITIES_REPLY); 1167 break; 1168 1169 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 1170 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1171 if (!hci_stack->ssp_auto_accept) break; 1172 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_CONFIRM_REPLY); 1173 break; 1174 1175 case HCI_EVENT_USER_PASSKEY_REQUEST: 1176 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1177 if (!hci_stack->ssp_auto_accept) break; 1178 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_PASSKEY_REPLY); 1179 break; 1180 1181 case HCI_EVENT_ENCRYPTION_CHANGE: 1182 handle = READ_BT_16(packet, 3); 1183 conn = hci_connection_for_handle(handle); 1184 if (!conn) break; 1185 if (packet[2] == 0) { 1186 if (packet[5]){ 1187 conn->authentication_flags |= CONNECTION_ENCRYPTED; 1188 } else { 1189 conn->authentication_flags &= ~CONNECTION_ENCRYPTED; 1190 } 1191 } 1192 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1193 break; 1194 1195 case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT: 1196 handle = READ_BT_16(packet, 3); 1197 conn = hci_connection_for_handle(handle); 1198 if (!conn) break; 1199 1200 // dedicated bonding: send result and disconnect 1201 if (conn->bonding_flags & BONDING_DEDICATED){ 1202 conn->bonding_flags &= ~BONDING_DEDICATED; 1203 conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE; 1204 conn->bonding_status = packet[2]; 1205 break; 1206 } 1207 1208 if (packet[2] == 0 && gap_security_level_for_link_key_type(conn->link_key_type) >= conn->requested_security_level){ 1209 // link key sufficient for requested security 1210 conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 1211 break; 1212 } 1213 // not enough 1214 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1215 break; 1216 1217 #ifndef EMBEDDED 1218 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 1219 if (!hci_stack->remote_device_db) break; 1220 if (packet[2]) break; // status not ok 1221 bt_flip_addr(addr, &packet[3]); 1222 // fix for invalid remote names - terminate on 0xff 1223 for (i=0; i<248;i++){ 1224 if (packet[9+i] == 0xff){ 1225 packet[9+i] = 0; 1226 break; 1227 } 1228 } 1229 memset(&device_name, 0, sizeof(device_name_t)); 1230 strncpy((char*) device_name, (char*) &packet[9], 248); 1231 hci_stack->remote_device_db->put_name(&addr, &device_name); 1232 break; 1233 1234 case HCI_EVENT_INQUIRY_RESULT: 1235 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:{ 1236 if (!hci_stack->remote_device_db) break; 1237 // first send inq result packet 1238 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1239 // then send cached remote names 1240 int offset = 3; 1241 for (i=0; i<packet[2];i++){ 1242 bt_flip_addr(addr, &packet[offset]); 1243 offset += 14; // 6 + 1 + 1 + 1 + 3 + 2; 1244 if (hci_stack->remote_device_db->get_name(&addr, &device_name)){ 1245 hci_emit_remote_name_cached(&addr, &device_name); 1246 } 1247 } 1248 return; 1249 } 1250 #endif 1251 1252 // HCI_EVENT_DISCONNECTION_COMPLETE 1253 // has been split, to first notify stack before shutting connection down 1254 // see end of function, too. 1255 case HCI_EVENT_DISCONNECTION_COMPLETE: 1256 if (packet[2]) break; // status != 0 1257 handle = READ_BT_16(packet, 3); 1258 hci_connection_t * conn = hci_connection_for_handle(handle); 1259 if (!conn) break; // no conn struct anymore 1260 conn->state = RECEIVED_DISCONNECTION_COMPLETE; 1261 break; 1262 1263 case HCI_EVENT_HARDWARE_ERROR: 1264 if(hci_stack->control && hci_stack->control->hw_error){ 1265 (*hci_stack->control->hw_error)(); 1266 } else { 1267 // if no special requests, just reboot stack 1268 hci_power_control_off(); 1269 hci_power_control_on(); 1270 } 1271 break; 1272 1273 case DAEMON_EVENT_HCI_PACKET_SENT: 1274 // release packet buffer only for asynchronous transport and if there are not further fragements 1275 if (hci_transport_synchronous()) { 1276 log_error("Synchronous HCI Transport shouldn't send DAEMON_EVENT_HCI_PACKET_SENT"); 1277 return; // instead of break: to avoid re-entering hci_run() 1278 } 1279 if (hci_stack->acl_fragmentation_total_size) break; 1280 hci_release_packet_buffer(); 1281 break; 1282 1283 #ifdef HAVE_BLE 1284 case HCI_EVENT_LE_META: 1285 switch (packet[2]){ 1286 case HCI_SUBEVENT_LE_ADVERTISING_REPORT: 1287 log_info("advertising report received"); 1288 if (hci_stack->le_scanning_state != LE_SCANNING) break; 1289 le_handle_advertisement_report(packet, size); 1290 break; 1291 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 1292 // Connection management 1293 bt_flip_addr(addr, &packet[8]); 1294 addr_type = (bd_addr_type_t)packet[7]; 1295 log_info("LE Connection_complete (status=%u) type %u, %s", packet[3], addr_type, bd_addr_to_str(addr)); 1296 // LE connections are auto-accepted, so just create a connection if there isn't one already 1297 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1298 if (packet[3]){ 1299 if (conn){ 1300 // outgoing connection failed, remove entry 1301 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1302 btstack_memory_hci_connection_free( conn ); 1303 } 1304 // if authentication error, also delete link key 1305 if (packet[3] == 0x05) { 1306 hci_drop_link_key_for_bd_addr(&addr); 1307 } 1308 break; 1309 } 1310 if (!conn){ 1311 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 1312 } 1313 if (!conn){ 1314 // no memory 1315 break; 1316 } 1317 1318 conn->state = OPEN; 1319 conn->con_handle = READ_BT_16(packet, 4); 1320 1321 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 1322 1323 // restart timer 1324 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1325 // run_loop_add_timer(&conn->timeout); 1326 1327 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1328 1329 hci_emit_nr_connections_changed(); 1330 break; 1331 1332 // log_info("LE buffer size: %u, count %u", READ_BT_16(packet,6), packet[8]); 1333 1334 default: 1335 break; 1336 } 1337 break; 1338 #endif 1339 default: 1340 break; 1341 } 1342 1343 // handle BT initialization 1344 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1345 hci_initializing_event_handler(packet, size); 1346 } 1347 1348 // help with BT sleep 1349 if (hci_stack->state == HCI_STATE_FALLING_ASLEEP 1350 && hci_stack->substate == 1 1351 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1352 hci_stack->substate++; 1353 } 1354 1355 // notify upper stack 1356 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1357 1358 // moved here to give upper stack a chance to close down everything with hci_connection_t intact 1359 if (packet[0] == HCI_EVENT_DISCONNECTION_COMPLETE){ 1360 if (!packet[2]){ 1361 handle = READ_BT_16(packet, 3); 1362 hci_connection_t * conn = hci_connection_for_handle(handle); 1363 if (conn) { 1364 uint8_t status = conn->bonding_status; 1365 uint16_t flags = conn->bonding_flags; 1366 bd_addr_t bd_address; 1367 memcpy(&bd_address, conn->address, 6); 1368 hci_shutdown_connection(conn); 1369 // connection struct is gone, don't access anymore 1370 if (flags & BONDING_EMIT_COMPLETE_ON_DISCONNECT){ 1371 hci_emit_dedicated_bonding_result(bd_address, status); 1372 } 1373 } 1374 } 1375 } 1376 1377 // execute main loop 1378 hci_run(); 1379 } 1380 1381 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1382 hci_dump_packet(packet_type, 1, packet, size); 1383 switch (packet_type) { 1384 case HCI_EVENT_PACKET: 1385 event_handler(packet, size); 1386 break; 1387 case HCI_ACL_DATA_PACKET: 1388 acl_handler(packet, size); 1389 break; 1390 default: 1391 break; 1392 } 1393 } 1394 1395 /** Register HCI packet handlers */ 1396 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 1397 hci_stack->packet_handler = handler; 1398 } 1399 1400 static void hci_state_reset(){ 1401 // no connections yet 1402 hci_stack->connections = NULL; 1403 1404 // keep discoverable/connectable as this has been requested by the client(s) 1405 // hci_stack->discoverable = 0; 1406 // hci_stack->connectable = 0; 1407 // hci_stack->bondable = 1; 1408 1409 // buffer is free 1410 hci_stack->hci_packet_buffer_reserved = 0; 1411 1412 // no pending cmds 1413 hci_stack->decline_reason = 0; 1414 hci_stack->new_scan_enable_value = 0xff; 1415 1416 // LE 1417 hci_stack->adv_addr_type = 0; 1418 memset(hci_stack->adv_address, 0, 6); 1419 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1420 hci_stack->le_scan_type = 0xff; 1421 hci_stack->le_connection_parameter_range.le_conn_interval_min = 0x0006; 1422 hci_stack->le_connection_parameter_range.le_conn_interval_max = 0x0C80; 1423 hci_stack->le_connection_parameter_range.le_conn_latency_min = 0x0000; 1424 hci_stack->le_connection_parameter_range.le_conn_latency_max = 0x03E8; 1425 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = 0x000A; 1426 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = 0x0C80; 1427 } 1428 1429 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 1430 1431 #ifdef HAVE_MALLOC 1432 if (!hci_stack) { 1433 hci_stack = (hci_stack_t*) malloc(sizeof(hci_stack_t)); 1434 } 1435 #else 1436 hci_stack = &hci_stack_static; 1437 #endif 1438 memset(hci_stack, 0, sizeof(hci_stack_t)); 1439 1440 // reference to use transport layer implementation 1441 hci_stack->hci_transport = transport; 1442 1443 // references to used control implementation 1444 hci_stack->control = control; 1445 1446 // reference to used config 1447 hci_stack->config = config; 1448 1449 // higher level handler 1450 hci_stack->packet_handler = dummy_handler; 1451 1452 // store and open remote device db 1453 hci_stack->remote_device_db = remote_device_db; 1454 if (hci_stack->remote_device_db) { 1455 hci_stack->remote_device_db->open(); 1456 } 1457 1458 // max acl payload size defined in config.h 1459 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1460 1461 // register packet handlers with transport 1462 transport->register_packet_handler(&packet_handler); 1463 1464 hci_stack->state = HCI_STATE_OFF; 1465 1466 // class of device 1467 hci_stack->class_of_device = 0x007a020c; // Smartphone 1468 1469 // bondable by default 1470 hci_stack->bondable = 1; 1471 1472 // Secure Simple Pairing default: enable, no I/O capabilities, general bonding, mitm not required, auto accept 1473 hci_stack->ssp_enable = 1; 1474 hci_stack->ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 1475 hci_stack->ssp_authentication_requirement = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING; 1476 hci_stack->ssp_auto_accept = 1; 1477 1478 hci_state_reset(); 1479 } 1480 1481 void hci_close(){ 1482 // close remote device db 1483 if (hci_stack->remote_device_db) { 1484 hci_stack->remote_device_db->close(); 1485 } 1486 while (hci_stack->connections) { 1487 // cancel all l2cap connections 1488 hci_emit_disconnection_complete(((hci_connection_t *) hci_stack->connections)->con_handle, 0x16); // terminated by local host 1489 hci_shutdown_connection((hci_connection_t *) hci_stack->connections); 1490 } 1491 hci_power_control(HCI_POWER_OFF); 1492 1493 #ifdef HAVE_MALLOC 1494 free(hci_stack); 1495 #endif 1496 hci_stack = NULL; 1497 } 1498 1499 void hci_set_class_of_device(uint32_t class_of_device){ 1500 hci_stack->class_of_device = class_of_device; 1501 } 1502 1503 void hci_disable_l2cap_timeout_check(){ 1504 disable_l2cap_timeouts = 1; 1505 } 1506 // State-Module-Driver overview 1507 // state module low-level 1508 // HCI_STATE_OFF off close 1509 // HCI_STATE_INITIALIZING, on open 1510 // HCI_STATE_WORKING, on open 1511 // HCI_STATE_HALTING, on open 1512 // HCI_STATE_SLEEPING, off/sleep close 1513 // HCI_STATE_FALLING_ASLEEP on open 1514 1515 static int hci_power_control_on(void){ 1516 1517 // power on 1518 int err = 0; 1519 if (hci_stack->control && hci_stack->control->on){ 1520 err = (*hci_stack->control->on)(hci_stack->config); 1521 } 1522 if (err){ 1523 log_error( "POWER_ON failed"); 1524 hci_emit_hci_open_failed(); 1525 return err; 1526 } 1527 1528 // open low-level device 1529 err = hci_stack->hci_transport->open(hci_stack->config); 1530 if (err){ 1531 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1532 if (hci_stack->control && hci_stack->control->off){ 1533 (*hci_stack->control->off)(hci_stack->config); 1534 } 1535 hci_emit_hci_open_failed(); 1536 return err; 1537 } 1538 return 0; 1539 } 1540 1541 static void hci_power_control_off(void){ 1542 1543 log_info("hci_power_control_off"); 1544 1545 // close low-level device 1546 hci_stack->hci_transport->close(hci_stack->config); 1547 1548 log_info("hci_power_control_off - hci_transport closed"); 1549 1550 // power off 1551 if (hci_stack->control && hci_stack->control->off){ 1552 (*hci_stack->control->off)(hci_stack->config); 1553 } 1554 1555 log_info("hci_power_control_off - control closed"); 1556 1557 hci_stack->state = HCI_STATE_OFF; 1558 } 1559 1560 static void hci_power_control_sleep(void){ 1561 1562 log_info("hci_power_control_sleep"); 1563 1564 #if 0 1565 // don't close serial port during sleep 1566 1567 // close low-level device 1568 hci_stack->hci_transport->close(hci_stack->config); 1569 #endif 1570 1571 // sleep mode 1572 if (hci_stack->control && hci_stack->control->sleep){ 1573 (*hci_stack->control->sleep)(hci_stack->config); 1574 } 1575 1576 hci_stack->state = HCI_STATE_SLEEPING; 1577 } 1578 1579 static int hci_power_control_wake(void){ 1580 1581 log_info("hci_power_control_wake"); 1582 1583 // wake on 1584 if (hci_stack->control && hci_stack->control->wake){ 1585 (*hci_stack->control->wake)(hci_stack->config); 1586 } 1587 1588 #if 0 1589 // open low-level device 1590 int err = hci_stack->hci_transport->open(hci_stack->config); 1591 if (err){ 1592 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1593 if (hci_stack->control && hci_stack->control->off){ 1594 (*hci_stack->control->off)(hci_stack->config); 1595 } 1596 hci_emit_hci_open_failed(); 1597 return err; 1598 } 1599 #endif 1600 1601 return 0; 1602 } 1603 1604 static void hci_power_transition_to_initializing(void){ 1605 // set up state machine 1606 hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent 1607 hci_stack->hci_packet_buffer_reserved = 0; 1608 hci_stack->state = HCI_STATE_INITIALIZING; 1609 hci_stack->substate = 0; 1610 } 1611 1612 int hci_power_control(HCI_POWER_MODE power_mode){ 1613 1614 log_info("hci_power_control: %u, current mode %u", power_mode, hci_stack->state); 1615 1616 int err = 0; 1617 switch (hci_stack->state){ 1618 1619 case HCI_STATE_OFF: 1620 switch (power_mode){ 1621 case HCI_POWER_ON: 1622 err = hci_power_control_on(); 1623 if (err) { 1624 log_error("hci_power_control_on() error %u", err); 1625 return err; 1626 } 1627 hci_power_transition_to_initializing(); 1628 break; 1629 case HCI_POWER_OFF: 1630 // do nothing 1631 break; 1632 case HCI_POWER_SLEEP: 1633 // do nothing (with SLEEP == OFF) 1634 break; 1635 } 1636 break; 1637 1638 case HCI_STATE_INITIALIZING: 1639 switch (power_mode){ 1640 case HCI_POWER_ON: 1641 // do nothing 1642 break; 1643 case HCI_POWER_OFF: 1644 // no connections yet, just turn it off 1645 hci_power_control_off(); 1646 break; 1647 case HCI_POWER_SLEEP: 1648 // no connections yet, just turn it off 1649 hci_power_control_sleep(); 1650 break; 1651 } 1652 break; 1653 1654 case HCI_STATE_WORKING: 1655 switch (power_mode){ 1656 case HCI_POWER_ON: 1657 // do nothing 1658 break; 1659 case HCI_POWER_OFF: 1660 // see hci_run 1661 hci_stack->state = HCI_STATE_HALTING; 1662 break; 1663 case HCI_POWER_SLEEP: 1664 // see hci_run 1665 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1666 hci_stack->substate = 0; 1667 break; 1668 } 1669 break; 1670 1671 case HCI_STATE_HALTING: 1672 switch (power_mode){ 1673 case HCI_POWER_ON: 1674 hci_power_transition_to_initializing(); 1675 break; 1676 case HCI_POWER_OFF: 1677 // do nothing 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_FALLING_ASLEEP: 1688 switch (power_mode){ 1689 case HCI_POWER_ON: 1690 1691 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1692 // nothing to do, if H4 supports power management 1693 if (bt_control_iphone_power_management_enabled()){ 1694 hci_stack->state = HCI_STATE_INITIALIZING; 1695 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1696 break; 1697 } 1698 #endif 1699 hci_power_transition_to_initializing(); 1700 break; 1701 case HCI_POWER_OFF: 1702 // see hci_run 1703 hci_stack->state = HCI_STATE_HALTING; 1704 break; 1705 case HCI_POWER_SLEEP: 1706 // do nothing 1707 break; 1708 } 1709 break; 1710 1711 case HCI_STATE_SLEEPING: 1712 switch (power_mode){ 1713 case HCI_POWER_ON: 1714 1715 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1716 // nothing to do, if H4 supports power management 1717 if (bt_control_iphone_power_management_enabled()){ 1718 hci_stack->state = HCI_STATE_INITIALIZING; 1719 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1720 hci_update_scan_enable(); 1721 break; 1722 } 1723 #endif 1724 err = hci_power_control_wake(); 1725 if (err) return err; 1726 hci_power_transition_to_initializing(); 1727 break; 1728 case HCI_POWER_OFF: 1729 hci_stack->state = HCI_STATE_HALTING; 1730 break; 1731 case HCI_POWER_SLEEP: 1732 // do nothing 1733 break; 1734 } 1735 break; 1736 } 1737 1738 // create internal event 1739 hci_emit_state(); 1740 1741 // trigger next/first action 1742 hci_run(); 1743 1744 return 0; 1745 } 1746 1747 static void hci_update_scan_enable(void){ 1748 // 2 = page scan, 1 = inq scan 1749 hci_stack->new_scan_enable_value = hci_stack->connectable << 1 | hci_stack->discoverable; 1750 hci_run(); 1751 } 1752 1753 void hci_discoverable_control(uint8_t enable){ 1754 if (enable) enable = 1; // normalize argument 1755 1756 if (hci_stack->discoverable == enable){ 1757 hci_emit_discoverable_enabled(hci_stack->discoverable); 1758 return; 1759 } 1760 1761 hci_stack->discoverable = enable; 1762 hci_update_scan_enable(); 1763 } 1764 1765 void hci_connectable_control(uint8_t enable){ 1766 if (enable) enable = 1; // normalize argument 1767 1768 // don't emit event 1769 if (hci_stack->connectable == enable) return; 1770 1771 hci_stack->connectable = enable; 1772 hci_update_scan_enable(); 1773 } 1774 1775 bd_addr_t * hci_local_bd_addr(void){ 1776 return &hci_stack->local_bd_addr; 1777 } 1778 1779 void hci_run(){ 1780 1781 hci_connection_t * connection; 1782 linked_item_t * it; 1783 1784 // send continuation fragments first, as they block the prepared packet buffer 1785 if (hci_stack->acl_fragmentation_total_size > 0) { 1786 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(hci_stack->hci_packet_buffer); 1787 if (hci_can_send_prepared_acl_packet_now(con_handle)){ 1788 hci_connection_t *connection = hci_connection_for_handle(con_handle); 1789 if (connection) { 1790 hci_send_acl_packet_fragments(connection); 1791 return; 1792 } 1793 // connection gone -> discard further fragments 1794 hci_stack->acl_fragmentation_total_size = 0; 1795 hci_stack->acl_fragmentation_pos = 0; 1796 } 1797 } 1798 1799 if (!hci_can_send_command_packet_now()) return; 1800 1801 // global/non-connection oriented commands 1802 1803 // decline incoming connections 1804 if (hci_stack->decline_reason){ 1805 uint8_t reason = hci_stack->decline_reason; 1806 hci_stack->decline_reason = 0; 1807 hci_send_cmd(&hci_reject_connection_request, hci_stack->decline_addr, reason); 1808 return; 1809 } 1810 1811 // send scan enable 1812 if (hci_stack->state == HCI_STATE_WORKING && hci_stack->new_scan_enable_value != 0xff && hci_classic_supported()){ 1813 hci_send_cmd(&hci_write_scan_enable, hci_stack->new_scan_enable_value); 1814 hci_stack->new_scan_enable_value = 0xff; 1815 return; 1816 } 1817 1818 #ifdef HAVE_BLE 1819 // handle le scan 1820 if (hci_stack->state == HCI_STATE_WORKING){ 1821 switch(hci_stack->le_scanning_state){ 1822 case LE_START_SCAN: 1823 hci_stack->le_scanning_state = LE_SCANNING; 1824 hci_send_cmd(&hci_le_set_scan_enable, 1, 0); 1825 return; 1826 1827 case LE_STOP_SCAN: 1828 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1829 hci_send_cmd(&hci_le_set_scan_enable, 0, 0); 1830 return; 1831 default: 1832 break; 1833 } 1834 if (hci_stack->le_scan_type != 0xff){ 1835 // defaults: active scanning, accept all advertisement packets 1836 int scan_type = hci_stack->le_scan_type; 1837 hci_stack->le_scan_type = 0xff; 1838 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); 1839 return; 1840 } 1841 } 1842 #endif 1843 1844 // send pending HCI commands 1845 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 1846 connection = (hci_connection_t *) it; 1847 1848 switch(connection->state){ 1849 case SEND_CREATE_CONNECTION: 1850 switch(connection->address_type){ 1851 case BD_ADDR_TYPE_CLASSIC: 1852 log_info("sending hci_create_connection"); 1853 hci_send_cmd(&hci_create_connection, connection->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 1854 break; 1855 default: 1856 #ifdef HAVE_BLE 1857 log_info("sending hci_le_create_connection"); 1858 hci_send_cmd(&hci_le_create_connection, 1859 0x0060, // scan interval: 60 ms 1860 0x0030, // scan interval: 30 ms 1861 0, // don't use whitelist 1862 connection->address_type, // peer address type 1863 connection->address, // peer bd addr 1864 hci_stack->adv_addr_type, // our addr type: 1865 0x0008, // conn interval min 1866 0x0018, // conn interval max 1867 0, // conn latency 1868 0x0048, // supervision timeout 1869 0x0001, // min ce length 1870 0x0001 // max ce length 1871 ); 1872 1873 connection->state = SENT_CREATE_CONNECTION; 1874 #endif 1875 break; 1876 } 1877 return; 1878 1879 case RECEIVED_CONNECTION_REQUEST: 1880 log_info("sending hci_accept_connection_request"); 1881 connection->state = ACCEPTED_CONNECTION_REQUEST; 1882 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 1883 return; 1884 1885 #ifdef HAVE_BLE 1886 case SEND_CANCEL_CONNECTION: 1887 connection->state = SENT_CANCEL_CONNECTION; 1888 hci_send_cmd(&hci_le_create_connection_cancel); 1889 return; 1890 #endif 1891 case SEND_DISCONNECT: 1892 connection->state = SENT_DISCONNECT; 1893 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1894 return; 1895 1896 default: 1897 break; 1898 } 1899 1900 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 1901 log_info("responding to link key request"); 1902 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 1903 link_key_t link_key; 1904 link_key_type_t link_key_type; 1905 if ( hci_stack->remote_device_db 1906 && hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type) 1907 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 1908 connection->link_key_type = link_key_type; 1909 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 1910 } else { 1911 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 1912 } 1913 return; 1914 } 1915 1916 if (connection->authentication_flags & DENY_PIN_CODE_REQUEST){ 1917 log_info("denying to pin request"); 1918 connectionClearAuthenticationFlags(connection, DENY_PIN_CODE_REQUEST); 1919 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 1920 return; 1921 } 1922 1923 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 1924 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 1925 log_info("IO Capability Request received, stack bondable %u, io cap %u", hci_stack->bondable, hci_stack->ssp_io_capability); 1926 if (hci_stack->bondable && (hci_stack->ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN)){ 1927 // tweak authentication requirements 1928 uint8_t authreq = hci_stack->ssp_authentication_requirement; 1929 if (connection->bonding_flags & BONDING_DEDICATED){ 1930 authreq = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING; 1931 } 1932 if (gap_mitm_protection_required_for_security_level(connection->requested_security_level)){ 1933 authreq |= 1; 1934 } 1935 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack->ssp_io_capability, NULL, authreq); 1936 } else { 1937 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 1938 } 1939 return; 1940 } 1941 1942 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 1943 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 1944 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 1945 return; 1946 } 1947 1948 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 1949 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 1950 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 1951 return; 1952 } 1953 1954 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 1955 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 1956 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 1957 return; 1958 } 1959 1960 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 1961 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 1962 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 1963 return; 1964 } 1965 if (connection->bonding_flags & BONDING_DISCONNECT_DEDICATED_DONE){ 1966 connection->bonding_flags &= ~BONDING_DISCONNECT_DEDICATED_DONE; 1967 connection->bonding_flags |= BONDING_EMIT_COMPLETE_ON_DISCONNECT; 1968 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // authentication done 1969 return; 1970 } 1971 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 1972 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 1973 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 1974 return; 1975 } 1976 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 1977 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 1978 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 1979 return; 1980 } 1981 1982 #ifdef HAVE_BLE 1983 if (connection->le_con_parameter_update_state == CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS){ 1984 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 1985 1986 uint16_t connection_interval_min = connection->le_conn_interval_min; 1987 connection->le_conn_interval_min = 0; 1988 hci_send_cmd(&hci_le_connection_update, connection->con_handle, connection_interval_min, 1989 connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout, 1990 0x0000, 0xffff); 1991 } 1992 #endif 1993 } 1994 1995 switch (hci_stack->state){ 1996 case HCI_STATE_INITIALIZING: 1997 hci_initializing_state_machine(); 1998 break; 1999 2000 case HCI_STATE_HALTING: 2001 2002 log_info("HCI_STATE_HALTING"); 2003 // close all open connections 2004 connection = (hci_connection_t *) hci_stack->connections; 2005 if (connection){ 2006 2007 // send disconnect 2008 if (!hci_can_send_command_packet_now()) return; 2009 2010 log_info("HCI_STATE_HALTING, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2011 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2012 2013 // send disconnected event right away - causes higher layer connections to get closed, too. 2014 hci_shutdown_connection(connection); 2015 return; 2016 } 2017 log_info("HCI_STATE_HALTING, calling off"); 2018 2019 // switch mode 2020 hci_power_control_off(); 2021 2022 log_info("HCI_STATE_HALTING, emitting state"); 2023 hci_emit_state(); 2024 log_info("HCI_STATE_HALTING, done"); 2025 break; 2026 2027 case HCI_STATE_FALLING_ASLEEP: 2028 switch(hci_stack->substate) { 2029 case 0: 2030 log_info("HCI_STATE_FALLING_ASLEEP"); 2031 // close all open connections 2032 connection = (hci_connection_t *) hci_stack->connections; 2033 2034 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2035 // don't close connections, if H4 supports power management 2036 if (bt_control_iphone_power_management_enabled()){ 2037 connection = NULL; 2038 } 2039 #endif 2040 if (connection){ 2041 2042 // send disconnect 2043 if (!hci_can_send_command_packet_now()) return; 2044 2045 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2046 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2047 2048 // send disconnected event right away - causes higher layer connections to get closed, too. 2049 hci_shutdown_connection(connection); 2050 return; 2051 } 2052 2053 if (hci_classic_supported()){ 2054 // disable page and inquiry scan 2055 if (!hci_can_send_command_packet_now()) return; 2056 2057 log_info("HCI_STATE_HALTING, disabling inq scans"); 2058 hci_send_cmd(&hci_write_scan_enable, hci_stack->connectable << 1); // drop inquiry scan but keep page scan 2059 2060 // continue in next sub state 2061 hci_stack->substate++; 2062 break; 2063 } 2064 // fall through for ble-only chips 2065 2066 case 2: 2067 log_info("HCI_STATE_HALTING, calling sleep"); 2068 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2069 // don't actually go to sleep, if H4 supports power management 2070 if (bt_control_iphone_power_management_enabled()){ 2071 // SLEEP MODE reached 2072 hci_stack->state = HCI_STATE_SLEEPING; 2073 hci_emit_state(); 2074 break; 2075 } 2076 #endif 2077 // switch mode 2078 hci_power_control_sleep(); // changes hci_stack->state to SLEEP 2079 hci_emit_state(); 2080 break; 2081 2082 default: 2083 break; 2084 } 2085 break; 2086 2087 default: 2088 break; 2089 } 2090 } 2091 2092 int hci_send_cmd_packet(uint8_t *packet, int size){ 2093 bd_addr_t addr; 2094 hci_connection_t * conn; 2095 // house-keeping 2096 2097 // create_connection? 2098 if (IS_COMMAND(packet, hci_create_connection)){ 2099 bt_flip_addr(addr, &packet[3]); 2100 log_info("Create_connection to %s", bd_addr_to_str(addr)); 2101 2102 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2103 if (!conn){ 2104 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2105 if (!conn){ 2106 // notify client that alloc failed 2107 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 2108 return 0; // don't sent packet to controller 2109 } 2110 conn->state = SEND_CREATE_CONNECTION; 2111 } 2112 log_info("conn state %u", conn->state); 2113 switch (conn->state){ 2114 // if connection active exists 2115 case OPEN: 2116 // and OPEN, emit connection complete command, don't send to controller 2117 hci_emit_connection_complete(conn, 0); 2118 return 0; 2119 case SEND_CREATE_CONNECTION: 2120 // connection created by hci, e.g. dedicated bonding 2121 break; 2122 default: 2123 // otherwise, just ignore as it is already in the open process 2124 return 0; 2125 } 2126 conn->state = SENT_CREATE_CONNECTION; 2127 } 2128 2129 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 2130 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 2131 } 2132 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 2133 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 2134 } 2135 2136 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 2137 if (hci_stack->remote_device_db){ 2138 bt_flip_addr(addr, &packet[3]); 2139 hci_stack->remote_device_db->delete_link_key(&addr); 2140 } 2141 } 2142 2143 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply) 2144 || IS_COMMAND(packet, hci_pin_code_request_reply)){ 2145 bt_flip_addr(addr, &packet[3]); 2146 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2147 if (conn){ 2148 connectionClearAuthenticationFlags(conn, LEGACY_PAIRING_ACTIVE); 2149 } 2150 } 2151 2152 if (IS_COMMAND(packet, hci_user_confirmation_request_negative_reply) 2153 || IS_COMMAND(packet, hci_user_confirmation_request_reply) 2154 || IS_COMMAND(packet, hci_user_passkey_request_negative_reply) 2155 || IS_COMMAND(packet, hci_user_passkey_request_reply)) { 2156 bt_flip_addr(addr, &packet[3]); 2157 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2158 if (conn){ 2159 connectionClearAuthenticationFlags(conn, SSP_PAIRING_ACTIVE); 2160 } 2161 } 2162 2163 #ifdef HAVE_BLE 2164 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 2165 hci_stack->adv_addr_type = packet[8]; 2166 } 2167 if (IS_COMMAND(packet, hci_le_set_random_address)){ 2168 bt_flip_addr(hci_stack->adv_address, &packet[3]); 2169 } 2170 #endif 2171 2172 hci_stack->num_cmd_packets--; 2173 2174 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, packet, size); 2175 int err = hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 2176 2177 // release packet buffer for synchronous transport implementations 2178 if (hci_transport_synchronous() && (packet == hci_stack->hci_packet_buffer)){ 2179 hci_stack->hci_packet_buffer_reserved = 0; 2180 } 2181 2182 return err; 2183 } 2184 2185 // disconnect because of security block 2186 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 2187 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2188 if (!connection) return; 2189 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 2190 } 2191 2192 2193 // Configure Secure Simple Pairing 2194 2195 // enable will enable SSP during init 2196 void hci_ssp_set_enable(int enable){ 2197 hci_stack->ssp_enable = enable; 2198 } 2199 2200 int hci_local_ssp_activated(){ 2201 return hci_ssp_supported() && hci_stack->ssp_enable; 2202 } 2203 2204 // if set, BTstack will respond to io capability request using authentication requirement 2205 void hci_ssp_set_io_capability(int io_capability){ 2206 hci_stack->ssp_io_capability = io_capability; 2207 } 2208 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 2209 hci_stack->ssp_authentication_requirement = authentication_requirement; 2210 } 2211 2212 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 2213 void hci_ssp_set_auto_accept(int auto_accept){ 2214 hci_stack->ssp_auto_accept = auto_accept; 2215 } 2216 2217 /** 2218 * pre: numcmds >= 0 - it's allowed to send a command to the controller 2219 */ 2220 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 2221 2222 if (!hci_can_send_command_packet_now()){ 2223 log_error("hci_send_cmd called but cannot send packet now"); 2224 return 0; 2225 } 2226 2227 // for HCI INITIALIZATION 2228 // log_info("hci_send_cmd: opcode %04x", cmd->opcode); 2229 hci_stack->last_cmd_opcode = cmd->opcode; 2230 2231 hci_reserve_packet_buffer(); 2232 uint8_t * packet = hci_stack->hci_packet_buffer; 2233 2234 va_list argptr; 2235 va_start(argptr, cmd); 2236 uint16_t size = hci_create_cmd_internal(packet, cmd, argptr); 2237 va_end(argptr); 2238 2239 return hci_send_cmd_packet(packet, size); 2240 } 2241 2242 // Create various non-HCI events. 2243 // TODO: generalize, use table similar to hci_create_command 2244 2245 void hci_emit_state(){ 2246 log_info("BTSTACK_EVENT_STATE %u", hci_stack->state); 2247 uint8_t event[3]; 2248 event[0] = BTSTACK_EVENT_STATE; 2249 event[1] = sizeof(event) - 2; 2250 event[2] = hci_stack->state; 2251 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2252 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2253 } 2254 2255 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 2256 uint8_t event[13]; 2257 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 2258 event[1] = sizeof(event) - 2; 2259 event[2] = status; 2260 bt_store_16(event, 3, conn->con_handle); 2261 bt_flip_addr(&event[5], conn->address); 2262 event[11] = 1; // ACL connection 2263 event[12] = 0; // encryption disabled 2264 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2265 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2266 } 2267 2268 void hci_emit_le_connection_complete(uint8_t address_type, bd_addr_t * address, uint16_t conn_handle, uint8_t status){ 2269 uint8_t event[21]; 2270 event[0] = HCI_EVENT_LE_META; 2271 event[1] = sizeof(event) - 2; 2272 event[2] = HCI_SUBEVENT_LE_CONNECTION_COMPLETE; 2273 event[3] = status; 2274 bt_store_16(event, 4, conn_handle); 2275 event[6] = 0; // TODO: role 2276 event[7] = address_type; 2277 bt_flip_addr(&event[8], *address); 2278 bt_store_16(event, 14, 0); // interval 2279 bt_store_16(event, 16, 0); // latency 2280 bt_store_16(event, 18, 0); // supervision timeout 2281 event[20] = 0; // master clock accuracy 2282 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2283 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2284 } 2285 2286 void hci_emit_disconnection_complete(uint16_t handle, uint8_t reason){ 2287 uint8_t event[6]; 2288 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 2289 event[1] = sizeof(event) - 2; 2290 event[2] = 0; // status = OK 2291 bt_store_16(event, 3, handle); 2292 event[5] = reason; 2293 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2294 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2295 } 2296 2297 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 2298 if (disable_l2cap_timeouts) return; 2299 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 2300 uint8_t event[4]; 2301 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 2302 event[1] = sizeof(event) - 2; 2303 bt_store_16(event, 2, conn->con_handle); 2304 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2305 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2306 } 2307 2308 void hci_emit_nr_connections_changed(){ 2309 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 2310 uint8_t event[3]; 2311 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 2312 event[1] = sizeof(event) - 2; 2313 event[2] = nr_hci_connections(); 2314 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2315 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2316 } 2317 2318 void hci_emit_hci_open_failed(){ 2319 log_info("BTSTACK_EVENT_POWERON_FAILED"); 2320 uint8_t event[2]; 2321 event[0] = BTSTACK_EVENT_POWERON_FAILED; 2322 event[1] = sizeof(event) - 2; 2323 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2324 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2325 } 2326 2327 #ifndef EMBEDDED 2328 void hci_emit_btstack_version() { 2329 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 2330 uint8_t event[6]; 2331 event[0] = BTSTACK_EVENT_VERSION; 2332 event[1] = sizeof(event) - 2; 2333 event[2] = BTSTACK_MAJOR; 2334 event[3] = BTSTACK_MINOR; 2335 bt_store_16(event, 4, BTSTACK_REVISION); 2336 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2337 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2338 } 2339 #endif 2340 2341 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 2342 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 2343 uint8_t event[3]; 2344 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 2345 event[1] = sizeof(event) - 2; 2346 event[2] = enabled; 2347 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2348 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2349 } 2350 2351 void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){ 2352 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 2353 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 2354 event[1] = sizeof(event) - 2 - 1; 2355 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 2356 bt_flip_addr(&event[3], *addr); 2357 memcpy(&event[9], name, 248); 2358 2359 event[9+248] = 0; // assert \0 for log_info 2360 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(*addr), &event[9]); 2361 2362 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 2363 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 2364 } 2365 2366 void hci_emit_discoverable_enabled(uint8_t enabled){ 2367 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 2368 uint8_t event[3]; 2369 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 2370 event[1] = sizeof(event) - 2; 2371 event[2] = enabled; 2372 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2373 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2374 } 2375 2376 void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){ 2377 log_info("hci_emit_security_level %u for handle %x", level, con_handle); 2378 uint8_t event[5]; 2379 int pos = 0; 2380 event[pos++] = GAP_SECURITY_LEVEL; 2381 event[pos++] = sizeof(event) - 2; 2382 bt_store_16(event, 2, con_handle); 2383 pos += 2; 2384 event[pos++] = level; 2385 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2386 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2387 } 2388 2389 void hci_emit_dedicated_bonding_result(bd_addr_t address, uint8_t status){ 2390 log_info("hci_emit_dedicated_bonding_result %u ", status); 2391 uint8_t event[9]; 2392 int pos = 0; 2393 event[pos++] = GAP_DEDICATED_BONDING_COMPLETED; 2394 event[pos++] = sizeof(event) - 2; 2395 event[pos++] = status; 2396 bt_flip_addr( * (bd_addr_t *) &event[pos], address); 2397 pos += 6; 2398 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2399 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2400 } 2401 2402 // query if remote side supports SSP 2403 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 2404 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2405 if (!connection) return 0; 2406 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 2407 } 2408 2409 int hci_ssp_supported_on_both_sides(hci_con_handle_t handle){ 2410 return hci_local_ssp_activated() && hci_remote_ssp_supported(handle); 2411 } 2412 2413 // GAP API 2414 /** 2415 * @bbrief enable/disable bonding. default is enabled 2416 * @praram enabled 2417 */ 2418 void gap_set_bondable_mode(int enable){ 2419 hci_stack->bondable = enable ? 1 : 0; 2420 } 2421 2422 /** 2423 * @brief map link keys to security levels 2424 */ 2425 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 2426 switch (link_key_type){ 2427 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 2428 return LEVEL_4; 2429 case COMBINATION_KEY: 2430 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 2431 return LEVEL_3; 2432 default: 2433 return LEVEL_2; 2434 } 2435 } 2436 2437 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 2438 if (!connection) return LEVEL_0; 2439 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 2440 return gap_security_level_for_link_key_type(connection->link_key_type); 2441 } 2442 2443 2444 int gap_mitm_protection_required_for_security_level(gap_security_level_t level){ 2445 log_info("gap_mitm_protection_required_for_security_level %u", level); 2446 return level > LEVEL_2; 2447 } 2448 2449 /** 2450 * @brief get current security level 2451 */ 2452 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 2453 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2454 if (!connection) return LEVEL_0; 2455 return gap_security_level_for_connection(connection); 2456 } 2457 2458 /** 2459 * @brief request connection to device to 2460 * @result GAP_AUTHENTICATION_RESULT 2461 */ 2462 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 2463 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2464 if (!connection){ 2465 hci_emit_security_level(con_handle, LEVEL_0); 2466 return; 2467 } 2468 gap_security_level_t current_level = gap_security_level(con_handle); 2469 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 2470 if (current_level >= requested_level){ 2471 hci_emit_security_level(con_handle, current_level); 2472 return; 2473 } 2474 2475 connection->requested_security_level = requested_level; 2476 2477 #if 0 2478 // sending encryption request without a link key results in an error. 2479 // TODO: figure out how to use it properly 2480 2481 // would enabling ecnryption suffice (>= LEVEL_2)? 2482 if (hci_stack->remote_device_db){ 2483 link_key_type_t link_key_type; 2484 link_key_t link_key; 2485 if (hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type)){ 2486 if (gap_security_level_for_link_key_type(link_key_type) >= requested_level){ 2487 connection->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 2488 return; 2489 } 2490 } 2491 } 2492 #endif 2493 2494 // try to authenticate connection 2495 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 2496 hci_run(); 2497 } 2498 2499 /** 2500 * @brief start dedicated bonding with device. disconnect after bonding 2501 * @param device 2502 * @param request MITM protection 2503 * @result GAP_DEDICATED_BONDING_COMPLETE 2504 */ 2505 int gap_dedicated_bonding(bd_addr_t device, int mitm_protection_required){ 2506 2507 // create connection state machine 2508 hci_connection_t * connection = create_connection_for_bd_addr_and_type(device, BD_ADDR_TYPE_CLASSIC); 2509 2510 if (!connection){ 2511 return BTSTACK_MEMORY_ALLOC_FAILED; 2512 } 2513 2514 // delete linkn key 2515 hci_drop_link_key_for_bd_addr( (bd_addr_t *) &device); 2516 2517 // configure LEVEL_2/3, dedicated bonding 2518 connection->state = SEND_CREATE_CONNECTION; 2519 connection->requested_security_level = mitm_protection_required ? LEVEL_3 : LEVEL_2; 2520 log_info("gap_dedicated_bonding, mitm %u -> level %u", mitm_protection_required, connection->requested_security_level); 2521 connection->bonding_flags = BONDING_DEDICATED; 2522 2523 // wait for GAP Security Result and send GAP Dedicated Bonding complete 2524 2525 // handle: connnection failure (connection complete != ok) 2526 // handle: authentication failure 2527 // handle: disconnect on done 2528 2529 hci_run(); 2530 2531 return 0; 2532 } 2533 2534 void gap_set_local_name(const char * local_name){ 2535 hci_stack->local_name = local_name; 2536 } 2537 2538 le_command_status_t le_central_start_scan(){ 2539 if (hci_stack->le_scanning_state == LE_SCANNING) return BLE_PERIPHERAL_OK; 2540 hci_stack->le_scanning_state = LE_START_SCAN; 2541 hci_run(); 2542 return BLE_PERIPHERAL_OK; 2543 } 2544 2545 le_command_status_t le_central_stop_scan(){ 2546 if ( hci_stack->le_scanning_state == LE_SCAN_IDLE) return BLE_PERIPHERAL_OK; 2547 hci_stack->le_scanning_state = LE_STOP_SCAN; 2548 hci_run(); 2549 return BLE_PERIPHERAL_OK; 2550 } 2551 2552 void le_central_set_scan_parameters(uint8_t scan_type, uint16_t scan_interval, uint16_t scan_window){ 2553 hci_stack->le_scan_type = scan_type; 2554 hci_stack->le_scan_interval = scan_interval; 2555 hci_stack->le_scan_window = scan_window; 2556 hci_run(); 2557 } 2558 2559 le_command_status_t le_central_connect(bd_addr_t * addr, bd_addr_type_t addr_type){ 2560 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 2561 if (!conn){ 2562 log_info("le_central_connect: no connection exists yet, creating context"); 2563 conn = create_connection_for_bd_addr_and_type(*addr, addr_type); 2564 if (!conn){ 2565 // notify client that alloc failed 2566 hci_emit_le_connection_complete(addr_type, addr, 0, BTSTACK_MEMORY_ALLOC_FAILED); 2567 log_info("le_central_connect: failed to alloc hci_connection_t"); 2568 return BLE_PERIPHERAL_NOT_CONNECTED; // don't sent packet to controller 2569 } 2570 conn->state = SEND_CREATE_CONNECTION; 2571 log_info("le_central_connect: send create connection next"); 2572 hci_run(); 2573 return BLE_PERIPHERAL_OK; 2574 } 2575 2576 if (!hci_is_le_connection(conn) || 2577 conn->state == SEND_CREATE_CONNECTION || 2578 conn->state == SENT_CREATE_CONNECTION) { 2579 hci_emit_le_connection_complete(conn->address_type, &conn->address, 0, ERROR_CODE_COMMAND_DISALLOWED); 2580 log_error("le_central_connect: classic connection or connect is already being created"); 2581 return BLE_PERIPHERAL_IN_WRONG_STATE; 2582 } 2583 2584 log_info("le_central_connect: context exists with state %u", conn->state); 2585 hci_emit_le_connection_complete(conn->address_type, &conn->address, conn->con_handle, 0); 2586 hci_run(); 2587 return BLE_PERIPHERAL_OK; 2588 } 2589 2590 // @assumption: only a single outgoing LE Connection exists 2591 static hci_connection_t * le_central_get_outgoing_connection(){ 2592 linked_item_t *it; 2593 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 2594 hci_connection_t * conn = (hci_connection_t *) it; 2595 if (!hci_is_le_connection(conn)) continue; 2596 switch (conn->state){ 2597 case SEND_CREATE_CONNECTION: 2598 case SENT_CREATE_CONNECTION: 2599 return conn; 2600 default: 2601 break; 2602 }; 2603 } 2604 return NULL; 2605 } 2606 2607 le_command_status_t le_central_connect_cancel(){ 2608 hci_connection_t * conn = le_central_get_outgoing_connection(); 2609 switch (conn->state){ 2610 case SEND_CREATE_CONNECTION: 2611 // skip sending create connection and emit event instead 2612 hci_emit_le_connection_complete(conn->address_type, &conn->address, 0, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 2613 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 2614 btstack_memory_hci_connection_free( conn ); 2615 break; 2616 case SENT_CREATE_CONNECTION: 2617 // request to send cancel connection 2618 conn->state = SEND_CANCEL_CONNECTION; 2619 hci_run(); 2620 break; 2621 default: 2622 break; 2623 } 2624 return BLE_PERIPHERAL_OK; 2625 } 2626 2627 /** 2628 * @brief Updates the connection parameters for a given LE connection 2629 * @param handle 2630 * @param conn_interval_min (unit: 1.25ms) 2631 * @param conn_interval_max (unit: 1.25ms) 2632 * @param conn_latency 2633 * @param supervision_timeout (unit: 10ms) 2634 * @returns 0 if ok 2635 */ 2636 int gap_update_connection_parameters(hci_con_handle_t con_handle, uint16_t conn_interval_min, 2637 uint16_t conn_interval_max, uint16_t conn_latency, uint16_t supervision_timeout){ 2638 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2639 if (!connection) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2640 connection->le_conn_interval_min = conn_interval_min; 2641 connection->le_conn_interval_max = conn_interval_max; 2642 connection->le_conn_latency = conn_latency; 2643 connection->le_supervision_timeout = supervision_timeout; 2644 return 0; 2645 } 2646 2647 le_command_status_t gap_disconnect(hci_con_handle_t handle){ 2648 hci_connection_t * conn = hci_connection_for_handle(handle); 2649 if (!conn){ 2650 hci_emit_disconnection_complete(handle, 0); 2651 return BLE_PERIPHERAL_OK; 2652 } 2653 conn->state = SEND_DISCONNECT; 2654 hci_run(); 2655 return BLE_PERIPHERAL_OK; 2656 } 2657 2658 void hci_disconnect_all(){ 2659 linked_list_iterator_t it; 2660 linked_list_iterator_init(&it, &hci_stack->connections); 2661 while (linked_list_iterator_has_next(&it)){ 2662 hci_connection_t * con = (hci_connection_t*) linked_list_iterator_next(&it); 2663 if (con->state == SENT_DISCONNECT) continue; 2664 con->state = SEND_DISCONNECT; 2665 } 2666 hci_run(); 2667 } 2668