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