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 log_info("num reports: %d, ", num_reports); 556 for (i=0; i<num_reports;i++){ 557 int pos = 0; 558 uint8_t data_length = packet[4+num_reports*8+i]; 559 uint8_t event_size = 10 + data_length; 560 uint8_t event[2 + event_size ]; 561 event[pos++] = GAP_LE_ADVERTISING_REPORT; 562 event[pos++] = event_size; 563 event[pos++] = packet[4+i]; // event_type; 564 event[pos++] = packet[4+num_reports+i]; // address_type; 565 memcpy(&event[pos], &packet[4+num_reports*2+i*6], 6); // bt address 566 pos += 6; 567 event[pos++] = packet[4+num_reports*9+total_data_length + i]; 568 log_info("rssi: %d, ", event[pos-1]); 569 event[pos++] = data_length; 570 memcpy(&event[pos], &packet[4+num_reports*9+data_offset], data_length); 571 data_offset += data_length; 572 pos += data_length; 573 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 574 } 575 } 576 #endif 577 578 static void hci_initializing_event_handler(uint8_t * packet, uint16_t size){ 579 uint8_t command_completed = 0; 580 if ((hci_stack->substate % 2) == 0) return; 581 // odd: waiting for event 582 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 583 uint16_t opcode = READ_BT_16(packet,3); 584 if (opcode == hci_stack->last_cmd_opcode){ 585 command_completed = 1; 586 log_info("Command complete for expected opcode %04x -> new substate %u", opcode, hci_stack->substate); 587 } else { 588 log_info("Command complete for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 589 } 590 } 591 if (packet[0] == HCI_EVENT_COMMAND_STATUS){ 592 uint8_t status = packet[2]; 593 uint16_t opcode = READ_BT_16(packet,4); 594 if (opcode == hci_stack->last_cmd_opcode){ 595 if (status){ 596 command_completed = 1; 597 log_error("Command status error 0x%02x for expected opcode %04x -> new substate %u", status, opcode, hci_stack->substate); 598 } else { 599 log_info("Command status OK for expected opcode %04x, waiting for command complete", opcode); 600 } 601 } else { 602 log_info("Command status for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 603 } 604 } 605 606 if (!command_completed) return; 607 608 switch(hci_stack->substate >> 1){ 609 default: 610 hci_stack->substate++; 611 break; 612 } 613 } 614 615 static void hci_initializing_state_machine(){ 616 // log_info("hci_init: substate %u\n", hci_stack->substate); 617 if (hci_stack->substate % 2) { 618 // odd: waiting for command completion 619 return; 620 } 621 switch (hci_stack->substate >> 1){ 622 case 0: // RESET 623 hci_state_reset(); 624 625 hci_send_cmd(&hci_reset); 626 if (hci_stack->config == NULL || ((hci_uart_config_t *)hci_stack->config)->baudrate_main == 0){ 627 // skip baud change 628 hci_stack->substate = 4; // >> 1 = 2 629 } 630 break; 631 case 1: // SEND BAUD CHANGE 632 hci_stack->control->baudrate_cmd(hci_stack->config, ((hci_uart_config_t *)hci_stack->config)->baudrate_main, hci_stack->hci_packet_buffer); 633 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 634 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 635 break; 636 case 2: // LOCAL BAUD CHANGE 637 log_info("Local baud rate change"); 638 hci_stack->hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack->config)->baudrate_main); 639 hci_stack->substate += 2; 640 // break missing here for fall through 641 642 case 3: 643 log_info("Custom init"); 644 // Custom initialization 645 if (hci_stack->control && hci_stack->control->next_cmd){ 646 int valid_cmd = (*hci_stack->control->next_cmd)(hci_stack->config, hci_stack->hci_packet_buffer); 647 if (valid_cmd){ 648 int size = 3 + hci_stack->hci_packet_buffer[2]; 649 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 650 hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack->hci_packet_buffer, size); 651 hci_stack->substate = 4; // more init commands 652 break; 653 } 654 log_info("hci_run: init script done\n\r"); 655 } 656 // otherwise continue 657 hci_send_cmd(&hci_read_bd_addr); 658 break; 659 case 4: 660 hci_send_cmd(&hci_read_buffer_size); 661 break; 662 case 5: 663 hci_send_cmd(&hci_read_local_supported_features); 664 break; 665 case 6: 666 if (hci_le_supported()){ 667 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 668 } else { 669 // Kensington Bluetoot 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 670 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 671 } 672 673 // skip Classic init commands for LE only chipsets 674 if (!hci_classic_supported()){ 675 if (hci_le_supported()){ 676 hci_stack->substate = 11 << 1; // skip all classic command 677 } else { 678 log_error("Neither BR/EDR nor LE supported"); 679 hci_stack->substate = 14 << 1; // skip all 680 } 681 } 682 break; 683 case 7: 684 if (hci_ssp_supported()){ 685 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack->ssp_enable); 686 break; 687 } 688 hci_stack->substate += 2; 689 // break missing here for fall through 690 691 case 8: 692 // ca. 15 sec 693 hci_send_cmd(&hci_write_page_timeout, 0x6000); 694 break; 695 case 9: 696 hci_send_cmd(&hci_write_class_of_device, hci_stack->class_of_device); 697 break; 698 case 10: 699 if (hci_stack->local_name){ 700 hci_send_cmd(&hci_write_local_name, hci_stack->local_name); 701 } else { 702 char hostname[30]; 703 #ifdef EMBEDDED 704 // BTstack-11:22:33:44:55:66 705 strcpy(hostname, "BTstack "); 706 strcat(hostname, bd_addr_to_str(hci_stack->local_bd_addr)); 707 log_info("---> Name %s", hostname); 708 #else 709 // hostname for POSIX systems 710 gethostname(hostname, 30); 711 hostname[29] = '\0'; 712 #endif 713 hci_send_cmd(&hci_write_local_name, hostname); 714 } 715 break; 716 case 11: 717 hci_send_cmd(&hci_write_scan_enable, (hci_stack->connectable << 1) | hci_stack->discoverable); // page scan 718 if (!hci_le_supported()){ 719 // SKIP LE init for Classic only configuration 720 hci_stack->substate = 14 << 1; 721 } 722 break; 723 724 #ifdef HAVE_BLE 725 // LE INIT 726 case 12: 727 hci_send_cmd(&hci_le_read_buffer_size); 728 break; 729 case 13: 730 // LE Supported Host = 1, Simultaneous Host = 0 731 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 732 break; 733 case 14: 734 // LE Scan Parameters: active scanning, 300 ms interval, 30 ms window, public address, accept all advs 735 hci_send_cmd(&hci_le_set_scan_parameters, 1, 0x1e0, 0x30, 0, 0); 736 break; 737 #endif 738 739 // DONE 740 case 15: 741 // done. 742 hci_stack->state = HCI_STATE_WORKING; 743 hci_emit_state(); 744 break; 745 default: 746 break; 747 } 748 hci_stack->substate++; 749 } 750 751 // avoid huge local variables 752 #ifndef EMBEDDED 753 static device_name_t device_name; 754 #endif 755 static void event_handler(uint8_t *packet, int size){ 756 757 uint16_t event_length = packet[1]; 758 759 // assert packet is complete 760 if (size != event_length + 2){ 761 log_error("hci.c: event_handler called with event packet of wrong size %u, expected %u => dropping packet", size, event_length + 2); 762 return; 763 } 764 765 bd_addr_t addr; 766 bd_addr_type_t addr_type; 767 uint8_t link_type; 768 hci_con_handle_t handle; 769 hci_connection_t * conn; 770 int i; 771 772 // printf("HCI:EVENT:%02x\n", packet[0]); 773 774 switch (packet[0]) { 775 776 case HCI_EVENT_COMMAND_COMPLETE: 777 // get num cmd packets 778 // log_info("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u\n", hci_stack->num_cmd_packets, packet[2]); 779 hci_stack->num_cmd_packets = packet[2]; 780 781 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 782 // from offset 5 783 // status 784 // "The HC_ACL_Data_Packet_Length return parameter will be used to determine the size of the L2CAP segments contained in ACL Data Packets" 785 hci_stack->acl_data_packet_length = READ_BT_16(packet, 6); 786 // ignore: SCO data packet len (8) 787 hci_stack->total_num_acl_packets = packet[9]; 788 // ignore: total num SCO packets 789 if (hci_stack->state == HCI_STATE_INITIALIZING){ 790 // determine usable ACL payload size 791 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->acl_data_packet_length){ 792 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 793 } 794 log_info("hci_read_buffer_size: used size %u, count %u\n", 795 hci_stack->acl_data_packet_length, hci_stack->total_num_acl_packets); 796 } 797 } 798 #ifdef HAVE_BLE 799 if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_buffer_size)){ 800 hci_stack->le_data_packet_length = READ_BT_16(packet, 6); 801 hci_stack->total_num_le_packets = packet[8]; 802 log_info("hci_le_read_buffer_size: size %u, count %u\n", hci_stack->le_data_packet_length, hci_stack->total_num_le_packets); 803 804 // use LE buffers if no clasic buffers have been reported 805 if (hci_stack->total_num_acl_packets == 0){ 806 log_info("use le buffers instead of classic ones"); 807 hci_stack->total_num_acl_packets = hci_stack->total_num_le_packets; 808 hci_stack->acl_data_packet_length = hci_stack->le_data_packet_length; 809 // determine usable ACL payload size 810 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->acl_data_packet_length){ 811 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 812 } 813 } 814 } 815 #endif 816 // Dump local address 817 if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)) { 818 bt_flip_addr(hci_stack->local_bd_addr, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1]); 819 log_info("Local Address, Status: 0x%02x: Addr: %s\n", 820 packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE], bd_addr_to_str(hci_stack->local_bd_addr)); 821 } 822 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 823 hci_emit_discoverable_enabled(hci_stack->discoverable); 824 } 825 // Note: HCI init checks 826 if (COMMAND_COMPLETE_EVENT(packet, hci_read_local_supported_features)){ 827 memcpy(hci_stack->local_supported_features, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1], 8); 828 log_info("Local Supported Features: 0x%02x%02x%02x%02x%02x%02x%02x%02x", 829 hci_stack->local_supported_features[0], hci_stack->local_supported_features[1], 830 hci_stack->local_supported_features[2], hci_stack->local_supported_features[3], 831 hci_stack->local_supported_features[4], hci_stack->local_supported_features[5], 832 hci_stack->local_supported_features[6], hci_stack->local_supported_features[7]); 833 834 // determine usable ACL packet types based buffer size and supported features 835 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]); 836 log_info("packet types %04x", hci_stack->packet_types); 837 838 // Classic/LE 839 log_info("BR/EDR support %u, LE support %u", hci_classic_supported(), hci_le_supported()); 840 } 841 break; 842 843 case HCI_EVENT_COMMAND_STATUS: 844 // get num cmd packets 845 // log_info("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u\n", hci_stack->num_cmd_packets, packet[3]); 846 hci_stack->num_cmd_packets = packet[3]; 847 break; 848 849 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:{ 850 int offset = 3; 851 for (i=0; i<packet[2];i++){ 852 handle = READ_BT_16(packet, offset); 853 offset += 2; 854 uint16_t num_packets = READ_BT_16(packet, offset); 855 offset += 2; 856 857 conn = hci_connection_for_handle(handle); 858 if (!conn){ 859 log_error("hci_number_completed_packet lists unused con handle %u\n", handle); 860 continue; 861 } 862 conn->num_acl_packets_sent -= num_packets; 863 // log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u\n", num_packets, handle, conn->num_acl_packets_sent); 864 } 865 break; 866 } 867 case HCI_EVENT_CONNECTION_REQUEST: 868 bt_flip_addr(addr, &packet[2]); 869 // TODO: eval COD 8-10 870 link_type = packet[11]; 871 log_info("Connection_incoming: %s, type %u\n", bd_addr_to_str(addr), link_type); 872 if (link_type == 1) { // ACL 873 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 874 if (!conn) { 875 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 876 } 877 if (!conn) { 878 // CONNECTION REJECTED DUE TO LIMITED RESOURCES (0X0D) 879 hci_stack->decline_reason = 0x0d; 880 BD_ADDR_COPY(hci_stack->decline_addr, addr); 881 break; 882 } 883 conn->state = RECEIVED_CONNECTION_REQUEST; 884 hci_run(); 885 } else { 886 // SYNCHRONOUS CONNECTION LIMIT TO A DEVICE EXCEEDED (0X0A) 887 hci_stack->decline_reason = 0x0a; 888 BD_ADDR_COPY(hci_stack->decline_addr, addr); 889 } 890 break; 891 892 case HCI_EVENT_CONNECTION_COMPLETE: 893 // Connection management 894 bt_flip_addr(addr, &packet[5]); 895 log_info("Connection_complete (status=%u) %s\n", packet[2], bd_addr_to_str(addr)); 896 addr_type = BD_ADDR_TYPE_CLASSIC; 897 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 898 if (conn) { 899 if (!packet[2]){ 900 conn->state = OPEN; 901 conn->con_handle = READ_BT_16(packet, 3); 902 conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES; 903 904 // restart timer 905 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 906 run_loop_add_timer(&conn->timeout); 907 908 log_info("New connection: handle %u, %s\n", conn->con_handle, bd_addr_to_str(conn->address)); 909 910 hci_emit_nr_connections_changed(); 911 } else { 912 // notify client if dedicated bonding 913 if (conn->bonding_flags & BONDING_DEDICATED){ 914 hci_emit_dedicated_bonding_result(conn, packet[2]); 915 } 916 917 // connection failed, remove entry 918 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 919 btstack_memory_hci_connection_free( conn ); 920 921 // if authentication error, also delete link key 922 if (packet[2] == 0x05) { 923 hci_drop_link_key_for_bd_addr(&addr); 924 } 925 } 926 } 927 break; 928 929 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 930 handle = READ_BT_16(packet, 3); 931 conn = hci_connection_for_handle(handle); 932 if (!conn) break; 933 if (!packet[2]){ 934 uint8_t * features = &packet[5]; 935 if (features[6] & (1 << 3)){ 936 conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP; 937 } 938 } 939 conn->bonding_flags |= BONDING_RECEIVED_REMOTE_FEATURES; 940 log_info("HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE, bonding flags %x", conn->bonding_flags); 941 if (conn->bonding_flags & BONDING_DEDICATED){ 942 conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 943 } 944 break; 945 946 case HCI_EVENT_LINK_KEY_REQUEST: 947 log_info("HCI_EVENT_LINK_KEY_REQUEST\n"); 948 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 949 // non-bondable mode: link key negative reply will be sent by HANDLE_LINK_KEY_REQUEST 950 if (hci_stack->bondable && !hci_stack->remote_device_db) break; 951 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], HANDLE_LINK_KEY_REQUEST); 952 hci_run(); 953 // request handled by hci_run() as HANDLE_LINK_KEY_REQUEST gets set 954 return; 955 956 case HCI_EVENT_LINK_KEY_NOTIFICATION: { 957 bt_flip_addr(addr, &packet[2]); 958 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 959 if (!conn) break; 960 conn->authentication_flags |= RECV_LINK_KEY_NOTIFICATION; 961 link_key_type_t link_key_type = (link_key_type_t)packet[24]; 962 // Change Connection Encryption keeps link key type 963 if (link_key_type != CHANGED_COMBINATION_KEY){ 964 conn->link_key_type = link_key_type; 965 } 966 if (!hci_stack->remote_device_db) break; 967 hci_stack->remote_device_db->put_link_key(&addr, (link_key_t *) &packet[8], conn->link_key_type); 968 // still forward event to allow dismiss of pairing dialog 969 break; 970 } 971 972 case HCI_EVENT_PIN_CODE_REQUEST: 973 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], LEGACY_PAIRING_ACTIVE); 974 // non-bondable mode: pin code negative reply will be sent 975 if (!hci_stack->bondable){ 976 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], DENY_PIN_CODE_REQUEST); 977 hci_run(); 978 return; 979 } 980 // PIN CODE REQUEST means the link key request didn't succee -> delete stored link key 981 if (!hci_stack->remote_device_db) break; 982 bt_flip_addr(addr, &packet[2]); 983 hci_stack->remote_device_db->delete_link_key(&addr); 984 break; 985 986 case HCI_EVENT_IO_CAPABILITY_REQUEST: 987 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_IO_CAPABILITIES_REQUEST); 988 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_IO_CAPABILITIES_REPLY); 989 break; 990 991 case HCI_EVENT_USER_CONFIRMATION_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_CONFIRM_REPLY); 995 break; 996 997 case HCI_EVENT_USER_PASSKEY_REQUEST: 998 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 999 if (!hci_stack->ssp_auto_accept) break; 1000 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_PASSKEY_REPLY); 1001 break; 1002 1003 case HCI_EVENT_ENCRYPTION_CHANGE: 1004 handle = READ_BT_16(packet, 3); 1005 conn = hci_connection_for_handle(handle); 1006 if (!conn) break; 1007 if (packet[2] == 0) { 1008 if (packet[5]){ 1009 conn->authentication_flags |= CONNECTION_ENCRYPTED; 1010 } else { 1011 conn->authentication_flags &= ~CONNECTION_ENCRYPTED; 1012 } 1013 } 1014 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1015 break; 1016 1017 case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT: 1018 handle = READ_BT_16(packet, 3); 1019 conn = hci_connection_for_handle(handle); 1020 if (!conn) break; 1021 1022 // dedicated bonding: send result and disconnect 1023 if (conn->bonding_flags & BONDING_DEDICATED){ 1024 conn->bonding_flags &= ~BONDING_DEDICATED; 1025 hci_emit_dedicated_bonding_result( conn, packet[2]); 1026 conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE; 1027 break; 1028 } 1029 1030 if (packet[2] == 0 && gap_security_level_for_link_key_type(conn->link_key_type) >= conn->requested_security_level){ 1031 // link key sufficient for requested security 1032 conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 1033 break; 1034 } 1035 // not enough 1036 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1037 break; 1038 1039 #ifndef EMBEDDED 1040 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 1041 if (!hci_stack->remote_device_db) break; 1042 if (packet[2]) break; // status not ok 1043 bt_flip_addr(addr, &packet[3]); 1044 // fix for invalid remote names - terminate on 0xff 1045 for (i=0; i<248;i++){ 1046 if (packet[9+i] == 0xff){ 1047 packet[9+i] = 0; 1048 break; 1049 } 1050 } 1051 memset(&device_name, 0, sizeof(device_name_t)); 1052 strncpy((char*) device_name, (char*) &packet[9], 248); 1053 hci_stack->remote_device_db->put_name(&addr, &device_name); 1054 break; 1055 1056 case HCI_EVENT_INQUIRY_RESULT: 1057 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:{ 1058 if (!hci_stack->remote_device_db) break; 1059 // first send inq result packet 1060 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1061 // then send cached remote names 1062 int offset = 3; 1063 for (i=0; i<packet[2];i++){ 1064 bt_flip_addr(addr, &packet[offset]); 1065 offset += 14; // 6 + 1 + 1 + 1 + 3 + 2; 1066 if (hci_stack->remote_device_db->get_name(&addr, &device_name)){ 1067 hci_emit_remote_name_cached(&addr, &device_name); 1068 } 1069 } 1070 return; 1071 } 1072 #endif 1073 1074 case HCI_EVENT_DISCONNECTION_COMPLETE: 1075 if (!packet[2]){ 1076 handle = READ_BT_16(packet, 3); 1077 hci_connection_t * conn = hci_connection_for_handle(handle); 1078 if (conn) { 1079 hci_shutdown_connection(conn); 1080 } 1081 } 1082 break; 1083 1084 case HCI_EVENT_HARDWARE_ERROR: 1085 if(hci_stack->control && hci_stack->control->hw_error){ 1086 (*hci_stack->control->hw_error)(); 1087 } else { 1088 // if no special requests, just reboot stack 1089 hci_power_control_off(); 1090 hci_power_control_on(); 1091 } 1092 break; 1093 1094 case DAEMON_EVENT_HCI_PACKET_SENT: 1095 // free packet buffer for asynchronous transport 1096 if (hci_transport_synchronous()) break; 1097 hci_stack->hci_packet_buffer_reserved = 0; 1098 break; 1099 1100 #ifdef HAVE_BLE 1101 case HCI_EVENT_LE_META: 1102 switch (packet[2]){ 1103 case HCI_SUBEVENT_LE_ADVERTISING_REPORT: 1104 log_info("advertising report received\n"); 1105 if (hci_stack->le_scanning_state != LE_SCANNING) break; 1106 le_handle_advertisement_report(packet, size); 1107 break; 1108 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 1109 // Connection management 1110 bt_flip_addr(addr, &packet[8]); 1111 addr_type = (bd_addr_type_t)packet[7]; 1112 log_info("LE Connection_complete (status=%u) type %u, %s\n", packet[3], addr_type, bd_addr_to_str(addr)); 1113 // LE connections are auto-accepted, so just create a connection if there isn't one already 1114 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1115 if (packet[3]){ 1116 if (conn){ 1117 // outgoing connection failed, remove entry 1118 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1119 btstack_memory_hci_connection_free( conn ); 1120 } 1121 // if authentication error, also delete link key 1122 if (packet[3] == 0x05) { 1123 hci_drop_link_key_for_bd_addr(&addr); 1124 } 1125 break; 1126 } 1127 if (!conn){ 1128 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 1129 } 1130 if (!conn){ 1131 // no memory 1132 break; 1133 } 1134 1135 conn->state = OPEN; 1136 conn->con_handle = READ_BT_16(packet, 4); 1137 1138 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 1139 1140 // restart timer 1141 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1142 // run_loop_add_timer(&conn->timeout); 1143 1144 log_info("New connection: handle %u, %s\n", conn->con_handle, bd_addr_to_str(conn->address)); 1145 1146 hci_emit_nr_connections_changed(); 1147 break; 1148 1149 // printf("LE buffer size: %u, count %u\n", READ_BT_16(packet,6), packet[8]); 1150 1151 default: 1152 break; 1153 } 1154 break; 1155 #endif 1156 default: 1157 break; 1158 } 1159 1160 // handle BT initialization 1161 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1162 hci_initializing_event_handler(packet, size); 1163 } 1164 1165 // help with BT sleep 1166 if (hci_stack->state == HCI_STATE_FALLING_ASLEEP 1167 && hci_stack->substate == 1 1168 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1169 hci_stack->substate++; 1170 } 1171 1172 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1173 1174 // execute main loop 1175 hci_run(); 1176 } 1177 1178 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1179 switch (packet_type) { 1180 case HCI_EVENT_PACKET: 1181 event_handler(packet, size); 1182 break; 1183 case HCI_ACL_DATA_PACKET: 1184 acl_handler(packet, size); 1185 break; 1186 default: 1187 break; 1188 } 1189 } 1190 1191 /** Register HCI packet handlers */ 1192 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 1193 hci_stack->packet_handler = handler; 1194 } 1195 1196 static void hci_state_reset(){ 1197 // no connections yet 1198 hci_stack->connections = NULL; 1199 1200 // keep discoverable/connectable as this has been requested by the client(s) 1201 // hci_stack->discoverable = 0; 1202 // hci_stack->connectable = 0; 1203 // hci_stack->bondable = 1; 1204 1205 // buffer is free 1206 hci_stack->hci_packet_buffer_reserved = 0; 1207 1208 // no pending cmds 1209 hci_stack->decline_reason = 0; 1210 hci_stack->new_scan_enable_value = 0xff; 1211 1212 // LE 1213 hci_stack->adv_addr_type = 0; 1214 memset(hci_stack->adv_address, 0, 6); 1215 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1216 hci_stack->le_scan_type = 0xff; 1217 } 1218 1219 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 1220 1221 #ifdef HAVE_MALLOC 1222 if (!hci_stack) { 1223 hci_stack = (hci_stack_t*) malloc(sizeof(hci_stack_t)); 1224 } 1225 #else 1226 hci_stack = &hci_stack_static; 1227 #endif 1228 memset(hci_stack, 0, sizeof(hci_stack_t)); 1229 1230 // reference to use transport layer implementation 1231 hci_stack->hci_transport = transport; 1232 1233 // references to used control implementation 1234 hci_stack->control = control; 1235 1236 // reference to used config 1237 hci_stack->config = config; 1238 1239 // higher level handler 1240 hci_stack->packet_handler = dummy_handler; 1241 1242 // store and open remote device db 1243 hci_stack->remote_device_db = remote_device_db; 1244 if (hci_stack->remote_device_db) { 1245 hci_stack->remote_device_db->open(); 1246 } 1247 1248 // max acl payload size defined in config.h 1249 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1250 1251 // register packet handlers with transport 1252 transport->register_packet_handler(&packet_handler); 1253 1254 hci_stack->state = HCI_STATE_OFF; 1255 1256 // class of device 1257 hci_stack->class_of_device = 0x007a020c; // Smartphone 1258 1259 // bondable by default 1260 hci_stack->bondable = 1; 1261 1262 // Secure Simple Pairing default: enable, no I/O capabilities, general bonding, mitm not required, auto accept 1263 hci_stack->ssp_enable = 1; 1264 hci_stack->ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 1265 hci_stack->ssp_authentication_requirement = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING; 1266 hci_stack->ssp_auto_accept = 1; 1267 1268 hci_state_reset(); 1269 } 1270 1271 void hci_close(){ 1272 // close remote device db 1273 if (hci_stack->remote_device_db) { 1274 hci_stack->remote_device_db->close(); 1275 } 1276 while (hci_stack->connections) { 1277 // cancel all l2cap connections 1278 hci_emit_disconnection_complete(((hci_connection_t *) hci_stack->connections)->con_handle, 0x16); // terminated by local host 1279 hci_shutdown_connection((hci_connection_t *) hci_stack->connections); 1280 } 1281 hci_power_control(HCI_POWER_OFF); 1282 1283 #ifdef HAVE_MALLOC 1284 free(hci_stack); 1285 #endif 1286 hci_stack = NULL; 1287 } 1288 1289 void hci_set_class_of_device(uint32_t class_of_device){ 1290 hci_stack->class_of_device = class_of_device; 1291 } 1292 1293 void hci_disable_l2cap_timeout_check(){ 1294 disable_l2cap_timeouts = 1; 1295 } 1296 // State-Module-Driver overview 1297 // state module low-level 1298 // HCI_STATE_OFF off close 1299 // HCI_STATE_INITIALIZING, on open 1300 // HCI_STATE_WORKING, on open 1301 // HCI_STATE_HALTING, on open 1302 // HCI_STATE_SLEEPING, off/sleep close 1303 // HCI_STATE_FALLING_ASLEEP on open 1304 1305 static int hci_power_control_on(void){ 1306 1307 // power on 1308 int err = 0; 1309 if (hci_stack->control && hci_stack->control->on){ 1310 err = (*hci_stack->control->on)(hci_stack->config); 1311 } 1312 if (err){ 1313 log_error( "POWER_ON failed\n"); 1314 hci_emit_hci_open_failed(); 1315 return err; 1316 } 1317 1318 // open low-level device 1319 err = hci_stack->hci_transport->open(hci_stack->config); 1320 if (err){ 1321 log_error( "HCI_INIT failed, turning Bluetooth off again\n"); 1322 if (hci_stack->control && hci_stack->control->off){ 1323 (*hci_stack->control->off)(hci_stack->config); 1324 } 1325 hci_emit_hci_open_failed(); 1326 return err; 1327 } 1328 return 0; 1329 } 1330 1331 static void hci_power_control_off(void){ 1332 1333 log_info("hci_power_control_off\n"); 1334 1335 // close low-level device 1336 hci_stack->hci_transport->close(hci_stack->config); 1337 1338 log_info("hci_power_control_off - hci_transport closed\n"); 1339 1340 // power off 1341 if (hci_stack->control && hci_stack->control->off){ 1342 (*hci_stack->control->off)(hci_stack->config); 1343 } 1344 1345 log_info("hci_power_control_off - control closed\n"); 1346 1347 hci_stack->state = HCI_STATE_OFF; 1348 } 1349 1350 static void hci_power_control_sleep(void){ 1351 1352 log_info("hci_power_control_sleep\n"); 1353 1354 #if 0 1355 // don't close serial port during sleep 1356 1357 // close low-level device 1358 hci_stack->hci_transport->close(hci_stack->config); 1359 #endif 1360 1361 // sleep mode 1362 if (hci_stack->control && hci_stack->control->sleep){ 1363 (*hci_stack->control->sleep)(hci_stack->config); 1364 } 1365 1366 hci_stack->state = HCI_STATE_SLEEPING; 1367 } 1368 1369 static int hci_power_control_wake(void){ 1370 1371 log_info("hci_power_control_wake\n"); 1372 1373 // wake on 1374 if (hci_stack->control && hci_stack->control->wake){ 1375 (*hci_stack->control->wake)(hci_stack->config); 1376 } 1377 1378 #if 0 1379 // open low-level device 1380 int err = hci_stack->hci_transport->open(hci_stack->config); 1381 if (err){ 1382 log_error( "HCI_INIT failed, turning Bluetooth off again\n"); 1383 if (hci_stack->control && hci_stack->control->off){ 1384 (*hci_stack->control->off)(hci_stack->config); 1385 } 1386 hci_emit_hci_open_failed(); 1387 return err; 1388 } 1389 #endif 1390 1391 return 0; 1392 } 1393 1394 static void hci_power_transition_to_initializing(void){ 1395 // set up state machine 1396 hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent 1397 hci_stack->hci_packet_buffer_reserved = 0; 1398 hci_stack->state = HCI_STATE_INITIALIZING; 1399 hci_stack->substate = 0; 1400 } 1401 1402 int hci_power_control(HCI_POWER_MODE power_mode){ 1403 1404 log_info("hci_power_control: %u, current mode %u\n", power_mode, hci_stack->state); 1405 1406 int err = 0; 1407 switch (hci_stack->state){ 1408 1409 case HCI_STATE_OFF: 1410 switch (power_mode){ 1411 case HCI_POWER_ON: 1412 err = hci_power_control_on(); 1413 if (err) { 1414 log_error("hci_power_control_on() error %u", err); 1415 return err; 1416 } 1417 hci_power_transition_to_initializing(); 1418 break; 1419 case HCI_POWER_OFF: 1420 // do nothing 1421 break; 1422 case HCI_POWER_SLEEP: 1423 // do nothing (with SLEEP == OFF) 1424 break; 1425 } 1426 break; 1427 1428 case HCI_STATE_INITIALIZING: 1429 switch (power_mode){ 1430 case HCI_POWER_ON: 1431 // do nothing 1432 break; 1433 case HCI_POWER_OFF: 1434 // no connections yet, just turn it off 1435 hci_power_control_off(); 1436 break; 1437 case HCI_POWER_SLEEP: 1438 // no connections yet, just turn it off 1439 hci_power_control_sleep(); 1440 break; 1441 } 1442 break; 1443 1444 case HCI_STATE_WORKING: 1445 switch (power_mode){ 1446 case HCI_POWER_ON: 1447 // do nothing 1448 break; 1449 case HCI_POWER_OFF: 1450 // see hci_run 1451 hci_stack->state = HCI_STATE_HALTING; 1452 break; 1453 case HCI_POWER_SLEEP: 1454 // see hci_run 1455 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1456 hci_stack->substate = 0; 1457 break; 1458 } 1459 break; 1460 1461 case HCI_STATE_HALTING: 1462 switch (power_mode){ 1463 case HCI_POWER_ON: 1464 hci_power_transition_to_initializing(); 1465 break; 1466 case HCI_POWER_OFF: 1467 // do nothing 1468 break; 1469 case HCI_POWER_SLEEP: 1470 // see hci_run 1471 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1472 hci_stack->substate = 0; 1473 break; 1474 } 1475 break; 1476 1477 case HCI_STATE_FALLING_ASLEEP: 1478 switch (power_mode){ 1479 case HCI_POWER_ON: 1480 1481 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1482 // nothing to do, if H4 supports power management 1483 if (bt_control_iphone_power_management_enabled()){ 1484 hci_stack->state = HCI_STATE_INITIALIZING; 1485 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1486 break; 1487 } 1488 #endif 1489 hci_power_transition_to_initializing(); 1490 break; 1491 case HCI_POWER_OFF: 1492 // see hci_run 1493 hci_stack->state = HCI_STATE_HALTING; 1494 break; 1495 case HCI_POWER_SLEEP: 1496 // do nothing 1497 break; 1498 } 1499 break; 1500 1501 case HCI_STATE_SLEEPING: 1502 switch (power_mode){ 1503 case HCI_POWER_ON: 1504 1505 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1506 // nothing to do, if H4 supports power management 1507 if (bt_control_iphone_power_management_enabled()){ 1508 hci_stack->state = HCI_STATE_INITIALIZING; 1509 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1510 hci_update_scan_enable(); 1511 break; 1512 } 1513 #endif 1514 err = hci_power_control_wake(); 1515 if (err) return err; 1516 hci_power_transition_to_initializing(); 1517 break; 1518 case HCI_POWER_OFF: 1519 hci_stack->state = HCI_STATE_HALTING; 1520 break; 1521 case HCI_POWER_SLEEP: 1522 // do nothing 1523 break; 1524 } 1525 break; 1526 } 1527 1528 // create internal event 1529 hci_emit_state(); 1530 1531 // trigger next/first action 1532 hci_run(); 1533 1534 return 0; 1535 } 1536 1537 static void hci_update_scan_enable(void){ 1538 // 2 = page scan, 1 = inq scan 1539 hci_stack->new_scan_enable_value = hci_stack->connectable << 1 | hci_stack->discoverable; 1540 hci_run(); 1541 } 1542 1543 void hci_discoverable_control(uint8_t enable){ 1544 if (enable) enable = 1; // normalize argument 1545 1546 if (hci_stack->discoverable == enable){ 1547 hci_emit_discoverable_enabled(hci_stack->discoverable); 1548 return; 1549 } 1550 1551 hci_stack->discoverable = enable; 1552 hci_update_scan_enable(); 1553 } 1554 1555 void hci_connectable_control(uint8_t enable){ 1556 if (enable) enable = 1; // normalize argument 1557 1558 // don't emit event 1559 if (hci_stack->connectable == enable) return; 1560 1561 hci_stack->connectable = enable; 1562 hci_update_scan_enable(); 1563 } 1564 1565 bd_addr_t * hci_local_bd_addr(void){ 1566 return &hci_stack->local_bd_addr; 1567 } 1568 1569 void hci_run(){ 1570 1571 hci_connection_t * connection; 1572 linked_item_t * it; 1573 1574 if (!hci_can_send_packet_now_using_packet_buffer(HCI_COMMAND_DATA_PACKET)) return; 1575 1576 // global/non-connection oriented commands 1577 1578 // decline incoming connections 1579 if (hci_stack->decline_reason){ 1580 uint8_t reason = hci_stack->decline_reason; 1581 hci_stack->decline_reason = 0; 1582 hci_send_cmd(&hci_reject_connection_request, hci_stack->decline_addr, reason); 1583 return; 1584 } 1585 1586 // send scan enable 1587 if (hci_stack->state == HCI_STATE_WORKING && hci_stack->new_scan_enable_value != 0xff && hci_classic_supported()){ 1588 hci_send_cmd(&hci_write_scan_enable, hci_stack->new_scan_enable_value); 1589 hci_stack->new_scan_enable_value = 0xff; 1590 return; 1591 } 1592 1593 #ifdef HAVE_BLE 1594 // handle le scan 1595 if (hci_stack->state == HCI_STATE_WORKING){ 1596 switch(hci_stack->le_scanning_state){ 1597 case LE_START_SCAN: 1598 hci_stack->le_scanning_state = LE_SCANNING; 1599 hci_send_cmd(&hci_le_set_scan_enable, 1, 0); 1600 return; 1601 1602 case LE_STOP_SCAN: 1603 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1604 hci_send_cmd(&hci_le_set_scan_enable, 0, 0); 1605 return; 1606 default: 1607 break; 1608 } 1609 if (hci_stack->le_scan_type != 0xff){ 1610 // defaults: active scanning, accept all advertisement packets 1611 int scan_type = hci_stack->le_scan_type; 1612 hci_stack->le_scan_type = 0xff; 1613 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); 1614 return; 1615 } 1616 } 1617 #endif 1618 1619 // send pending HCI commands 1620 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 1621 connection = (hci_connection_t *) it; 1622 1623 switch(connection->state){ 1624 case SEND_CREATE_CONNECTION: 1625 switch(connection->address_type){ 1626 case BD_ADDR_TYPE_CLASSIC: 1627 log_info("sending hci_create_connection\n"); 1628 hci_send_cmd(&hci_create_connection, connection->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 1629 break; 1630 default: 1631 #ifdef HAVE_BLE 1632 log_info("sending hci_le_create_connection\n"); 1633 hci_send_cmd(&hci_le_create_connection, 1634 0x0060, // scan interval: 60 ms 1635 0x0030, // scan interval: 30 ms 1636 0, // don't use whitelist 1637 connection->address_type, // peer address type 1638 connection->address, // peer bd addr 1639 hci_stack->adv_addr_type, // our addr type: 1640 0x0008, // conn interval min 1641 0x0018, // conn interval max 1642 0, // conn latency 1643 0x0048, // supervision timeout 1644 0x0001, // min ce length 1645 0x0001 // max ce length 1646 ); 1647 1648 connection->state = SENT_CREATE_CONNECTION; 1649 #endif 1650 break; 1651 } 1652 return; 1653 1654 case RECEIVED_CONNECTION_REQUEST: 1655 log_info("sending hci_accept_connection_request\n"); 1656 connection->state = ACCEPTED_CONNECTION_REQUEST; 1657 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 1658 return; 1659 1660 #ifdef HAVE_BLE 1661 case SEND_CANCEL_CONNECTION: 1662 connection->state = SENT_CANCEL_CONNECTION; 1663 hci_send_cmd(&hci_le_create_connection_cancel); 1664 return; 1665 #endif 1666 case SEND_DISCONNECT: 1667 connection->state = SENT_DISCONNECT; 1668 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1669 return; 1670 1671 default: 1672 break; 1673 } 1674 1675 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 1676 log_info("responding to link key request\n"); 1677 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 1678 link_key_t link_key; 1679 link_key_type_t link_key_type; 1680 if ( hci_stack->remote_device_db 1681 && hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type) 1682 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 1683 connection->link_key_type = link_key_type; 1684 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 1685 } else { 1686 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 1687 } 1688 return; 1689 } 1690 1691 if (connection->authentication_flags & DENY_PIN_CODE_REQUEST){ 1692 log_info("denying to pin request\n"); 1693 connectionClearAuthenticationFlags(connection, DENY_PIN_CODE_REQUEST); 1694 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 1695 return; 1696 } 1697 1698 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 1699 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 1700 log_info("IO Capability Request received, stack bondable %u, io cap %u", hci_stack->bondable, hci_stack->ssp_io_capability); 1701 if (hci_stack->bondable && (hci_stack->ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN)){ 1702 // tweak authentication requirements 1703 uint8_t authreq = hci_stack->ssp_authentication_requirement; 1704 if (connection->bonding_flags & BONDING_DEDICATED){ 1705 authreq = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING; 1706 } 1707 if (gap_mitm_protection_required_for_security_level(connection->requested_security_level)){ 1708 authreq |= 1; 1709 } 1710 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack->ssp_io_capability, NULL, authreq); 1711 } else { 1712 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 1713 } 1714 return; 1715 } 1716 1717 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 1718 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 1719 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 1720 return; 1721 } 1722 1723 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 1724 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 1725 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 1726 return; 1727 } 1728 1729 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 1730 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 1731 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 1732 return; 1733 } 1734 1735 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 1736 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 1737 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 1738 return; 1739 } 1740 if (connection->bonding_flags & BONDING_DISCONNECT_DEDICATED_DONE){ 1741 connection->bonding_flags &= ~BONDING_DISCONNECT_DEDICATED_DONE; 1742 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // authentication done 1743 return; 1744 } 1745 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 1746 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 1747 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 1748 return; 1749 } 1750 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 1751 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 1752 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 1753 return; 1754 } 1755 } 1756 1757 switch (hci_stack->state){ 1758 case HCI_STATE_INITIALIZING: 1759 hci_initializing_state_machine(); 1760 break; 1761 1762 case HCI_STATE_HALTING: 1763 1764 log_info("HCI_STATE_HALTING\n"); 1765 // close all open connections 1766 connection = (hci_connection_t *) hci_stack->connections; 1767 if (connection){ 1768 1769 // send disconnect 1770 if (!hci_can_send_packet_now_using_packet_buffer(HCI_COMMAND_DATA_PACKET)) return; 1771 1772 log_info("HCI_STATE_HALTING, connection %p, handle %u\n", connection, (uint16_t)connection->con_handle); 1773 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1774 1775 // send disconnected event right away - causes higher layer connections to get closed, too. 1776 hci_shutdown_connection(connection); 1777 return; 1778 } 1779 log_info("HCI_STATE_HALTING, calling off\n"); 1780 1781 // switch mode 1782 hci_power_control_off(); 1783 1784 log_info("HCI_STATE_HALTING, emitting state\n"); 1785 hci_emit_state(); 1786 log_info("HCI_STATE_HALTING, done\n"); 1787 break; 1788 1789 case HCI_STATE_FALLING_ASLEEP: 1790 switch(hci_stack->substate) { 1791 case 0: 1792 log_info("HCI_STATE_FALLING_ASLEEP\n"); 1793 // close all open connections 1794 connection = (hci_connection_t *) hci_stack->connections; 1795 1796 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1797 // don't close connections, if H4 supports power management 1798 if (bt_control_iphone_power_management_enabled()){ 1799 connection = NULL; 1800 } 1801 #endif 1802 if (connection){ 1803 1804 // send disconnect 1805 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1806 1807 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u\n", connection, (uint16_t)connection->con_handle); 1808 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1809 1810 // send disconnected event right away - causes higher layer connections to get closed, too. 1811 hci_shutdown_connection(connection); 1812 return; 1813 } 1814 1815 if (hci_classic_supported()){ 1816 // disable page and inquiry scan 1817 if (!hci_can_send_packet_now_using_packet_buffer(HCI_COMMAND_DATA_PACKET)) return; 1818 1819 log_info("HCI_STATE_HALTING, disabling inq scans\n"); 1820 hci_send_cmd(&hci_write_scan_enable, hci_stack->connectable << 1); // drop inquiry scan but keep page scan 1821 1822 // continue in next sub state 1823 hci_stack->substate++; 1824 break; 1825 } 1826 // fall through for ble-only chips 1827 1828 case 2: 1829 log_info("HCI_STATE_HALTING, calling sleep\n"); 1830 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1831 // don't actually go to sleep, if H4 supports power management 1832 if (bt_control_iphone_power_management_enabled()){ 1833 // SLEEP MODE reached 1834 hci_stack->state = HCI_STATE_SLEEPING; 1835 hci_emit_state(); 1836 break; 1837 } 1838 #endif 1839 // switch mode 1840 hci_power_control_sleep(); // changes hci_stack->state to SLEEP 1841 hci_emit_state(); 1842 break; 1843 1844 default: 1845 break; 1846 } 1847 break; 1848 1849 default: 1850 break; 1851 } 1852 } 1853 1854 int hci_send_cmd_packet(uint8_t *packet, int size){ 1855 bd_addr_t addr; 1856 hci_connection_t * conn; 1857 // house-keeping 1858 1859 // create_connection? 1860 if (IS_COMMAND(packet, hci_create_connection)){ 1861 bt_flip_addr(addr, &packet[3]); 1862 log_info("Create_connection to %s\n", bd_addr_to_str(addr)); 1863 1864 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1865 if (!conn){ 1866 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 1867 if (!conn){ 1868 // notify client that alloc failed 1869 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 1870 return 0; // don't sent packet to controller 1871 } 1872 conn->state = SEND_CREATE_CONNECTION; 1873 } 1874 log_info("conn state %u", conn->state); 1875 switch (conn->state){ 1876 // if connection active exists 1877 case OPEN: 1878 // and OPEN, emit connection complete command, don't send to controller 1879 hci_emit_connection_complete(conn, 0); 1880 return 0; 1881 case SEND_CREATE_CONNECTION: 1882 // connection created by hci, e.g. dedicated bonding 1883 break; 1884 default: 1885 // otherwise, just ignore as it is already in the open process 1886 return 0; 1887 } 1888 conn->state = SENT_CREATE_CONNECTION; 1889 } 1890 1891 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 1892 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 1893 } 1894 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 1895 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 1896 } 1897 1898 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 1899 if (hci_stack->remote_device_db){ 1900 bt_flip_addr(addr, &packet[3]); 1901 hci_stack->remote_device_db->delete_link_key(&addr); 1902 } 1903 } 1904 1905 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply) 1906 || IS_COMMAND(packet, hci_pin_code_request_reply)){ 1907 bt_flip_addr(addr, &packet[3]); 1908 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1909 if (conn){ 1910 connectionClearAuthenticationFlags(conn, LEGACY_PAIRING_ACTIVE); 1911 } 1912 } 1913 1914 if (IS_COMMAND(packet, hci_user_confirmation_request_negative_reply) 1915 || IS_COMMAND(packet, hci_user_confirmation_request_reply) 1916 || IS_COMMAND(packet, hci_user_passkey_request_negative_reply) 1917 || IS_COMMAND(packet, hci_user_passkey_request_reply)) { 1918 bt_flip_addr(addr, &packet[3]); 1919 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1920 if (conn){ 1921 connectionClearAuthenticationFlags(conn, SSP_PAIRING_ACTIVE); 1922 } 1923 } 1924 1925 #ifdef HAVE_BLE 1926 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 1927 hci_stack->adv_addr_type = packet[8]; 1928 } 1929 if (IS_COMMAND(packet, hci_le_set_random_address)){ 1930 bt_flip_addr(hci_stack->adv_address, &packet[3]); 1931 } 1932 #endif 1933 1934 hci_stack->num_cmd_packets--; 1935 int err = hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 1936 1937 // free packet buffer for synchronous transport implementations 1938 if (hci_transport_synchronous() && (packet == hci_stack->hci_packet_buffer)){ 1939 hci_stack->hci_packet_buffer_reserved = 0; 1940 } 1941 1942 return err; 1943 } 1944 1945 // disconnect because of security block 1946 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 1947 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1948 if (!connection) return; 1949 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 1950 } 1951 1952 1953 // Configure Secure Simple Pairing 1954 1955 // enable will enable SSP during init 1956 void hci_ssp_set_enable(int enable){ 1957 hci_stack->ssp_enable = enable; 1958 } 1959 1960 int hci_local_ssp_activated(){ 1961 return hci_ssp_supported() && hci_stack->ssp_enable; 1962 } 1963 1964 // if set, BTstack will respond to io capability request using authentication requirement 1965 void hci_ssp_set_io_capability(int io_capability){ 1966 hci_stack->ssp_io_capability = io_capability; 1967 } 1968 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 1969 hci_stack->ssp_authentication_requirement = authentication_requirement; 1970 } 1971 1972 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 1973 void hci_ssp_set_auto_accept(int auto_accept){ 1974 hci_stack->ssp_auto_accept = auto_accept; 1975 } 1976 1977 /** 1978 * pre: numcmds >= 0 - it's allowed to send a command to the controller 1979 */ 1980 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 1981 1982 if (!hci_can_send_packet_now_using_packet_buffer(HCI_COMMAND_DATA_PACKET)){ 1983 log_error("hci_send_cmd called but cannot send packet now"); 1984 return 0; 1985 } 1986 1987 // for HCI INITIALIZATION 1988 // printf("hci_send_cmd: opcode %04x\n", cmd->opcode); 1989 hci_stack->last_cmd_opcode = cmd->opcode; 1990 1991 hci_reserve_packet_buffer(); 1992 uint8_t * packet = hci_stack->hci_packet_buffer; 1993 1994 va_list argptr; 1995 va_start(argptr, cmd); 1996 uint16_t size = hci_create_cmd_internal(packet, cmd, argptr); 1997 va_end(argptr); 1998 1999 return hci_send_cmd_packet(packet, size); 2000 } 2001 2002 // Create various non-HCI events. 2003 // TODO: generalize, use table similar to hci_create_command 2004 2005 void hci_emit_state(){ 2006 log_info("BTSTACK_EVENT_STATE %u", hci_stack->state); 2007 uint8_t event[3]; 2008 event[0] = BTSTACK_EVENT_STATE; 2009 event[1] = sizeof(event) - 2; 2010 event[2] = hci_stack->state; 2011 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2012 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2013 } 2014 2015 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 2016 uint8_t event[13]; 2017 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 2018 event[1] = sizeof(event) - 2; 2019 event[2] = status; 2020 bt_store_16(event, 3, conn->con_handle); 2021 bt_flip_addr(&event[5], conn->address); 2022 event[11] = 1; // ACL connection 2023 event[12] = 0; // encryption disabled 2024 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2025 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2026 } 2027 2028 void hci_emit_le_connection_complete(hci_connection_t *conn, uint8_t status){ 2029 uint8_t event[21]; 2030 event[0] = HCI_EVENT_LE_META; 2031 event[1] = sizeof(event) - 2; 2032 event[2] = HCI_SUBEVENT_LE_CONNECTION_COMPLETE; 2033 event[3] = status; 2034 bt_store_16(event, 4, conn->con_handle); 2035 event[6] = 0; // TODO: role 2036 event[7] = conn->address_type; 2037 bt_flip_addr(&event[8], conn->address); 2038 bt_store_16(event, 14, 0); // interval 2039 bt_store_16(event, 16, 0); // latency 2040 bt_store_16(event, 18, 0); // supervision timeout 2041 event[20] = 0; // master clock accuracy 2042 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2043 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2044 } 2045 2046 void hci_emit_disconnection_complete(uint16_t handle, uint8_t reason){ 2047 uint8_t event[6]; 2048 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 2049 event[1] = sizeof(event) - 2; 2050 event[2] = 0; // status = OK 2051 bt_store_16(event, 3, handle); 2052 event[5] = reason; 2053 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2054 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2055 } 2056 2057 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 2058 if (disable_l2cap_timeouts) return; 2059 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 2060 uint8_t event[4]; 2061 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 2062 event[1] = sizeof(event) - 2; 2063 bt_store_16(event, 2, conn->con_handle); 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_nr_connections_changed(){ 2069 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 2070 uint8_t event[3]; 2071 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 2072 event[1] = sizeof(event) - 2; 2073 event[2] = nr_hci_connections(); 2074 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2075 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2076 } 2077 2078 void hci_emit_hci_open_failed(){ 2079 log_info("BTSTACK_EVENT_POWERON_FAILED"); 2080 uint8_t event[2]; 2081 event[0] = BTSTACK_EVENT_POWERON_FAILED; 2082 event[1] = sizeof(event) - 2; 2083 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2084 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2085 } 2086 2087 #ifndef EMBEDDED 2088 void hci_emit_btstack_version() { 2089 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 2090 uint8_t event[6]; 2091 event[0] = BTSTACK_EVENT_VERSION; 2092 event[1] = sizeof(event) - 2; 2093 event[2] = BTSTACK_MAJOR; 2094 event[3] = BTSTACK_MINOR; 2095 bt_store_16(event, 4, BTSTACK_REVISION); 2096 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2097 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2098 } 2099 #endif 2100 2101 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 2102 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 2103 uint8_t event[3]; 2104 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 2105 event[1] = sizeof(event) - 2; 2106 event[2] = enabled; 2107 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2108 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2109 } 2110 2111 void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){ 2112 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 2113 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 2114 event[1] = sizeof(event) - 2 - 1; 2115 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 2116 bt_flip_addr(&event[3], *addr); 2117 memcpy(&event[9], name, 248); 2118 2119 event[9+248] = 0; // assert \0 for log_info 2120 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(*addr), &event[9]); 2121 2122 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 2123 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 2124 } 2125 2126 void hci_emit_discoverable_enabled(uint8_t enabled){ 2127 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 2128 uint8_t event[3]; 2129 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 2130 event[1] = sizeof(event) - 2; 2131 event[2] = enabled; 2132 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2133 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2134 } 2135 2136 void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){ 2137 log_info("hci_emit_security_level %u for handle %x", level, con_handle); 2138 uint8_t event[5]; 2139 int pos = 0; 2140 event[pos++] = GAP_SECURITY_LEVEL; 2141 event[pos++] = sizeof(event) - 2; 2142 bt_store_16(event, 2, con_handle); 2143 pos += 2; 2144 event[pos++] = level; 2145 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2146 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2147 } 2148 2149 void hci_emit_dedicated_bonding_result(hci_connection_t * connection, uint8_t status){ 2150 log_info("hci_emit_dedicated_bonding_result %u ", status); 2151 uint8_t event[9]; 2152 int pos = 0; 2153 event[pos++] = GAP_DEDICATED_BONDING_COMPLETED; 2154 event[pos++] = sizeof(event) - 2; 2155 event[pos++] = status; 2156 bt_flip_addr( * (bd_addr_t *) &event[pos], connection->address); 2157 pos += 6; 2158 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2159 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2160 } 2161 2162 // query if remote side supports SSP 2163 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 2164 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2165 if (!connection) return 0; 2166 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 2167 } 2168 2169 int hci_ssp_supported_on_both_sides(hci_con_handle_t handle){ 2170 return hci_local_ssp_activated() && hci_remote_ssp_supported(handle); 2171 } 2172 2173 // GAP API 2174 /** 2175 * @bbrief enable/disable bonding. default is enabled 2176 * @praram enabled 2177 */ 2178 void gap_set_bondable_mode(int enable){ 2179 hci_stack->bondable = enable ? 1 : 0; 2180 } 2181 2182 /** 2183 * @brief map link keys to security levels 2184 */ 2185 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 2186 switch (link_key_type){ 2187 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 2188 return LEVEL_4; 2189 case COMBINATION_KEY: 2190 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 2191 return LEVEL_3; 2192 default: 2193 return LEVEL_2; 2194 } 2195 } 2196 2197 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 2198 if (!connection) return LEVEL_0; 2199 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 2200 return gap_security_level_for_link_key_type(connection->link_key_type); 2201 } 2202 2203 2204 int gap_mitm_protection_required_for_security_level(gap_security_level_t level){ 2205 log_info("gap_mitm_protection_required_for_security_level %u", level); 2206 return level > LEVEL_2; 2207 } 2208 2209 /** 2210 * @brief get current security level 2211 */ 2212 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 2213 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2214 if (!connection) return LEVEL_0; 2215 return gap_security_level_for_connection(connection); 2216 } 2217 2218 /** 2219 * @brief request connection to device to 2220 * @result GAP_AUTHENTICATION_RESULT 2221 */ 2222 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 2223 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2224 if (!connection){ 2225 hci_emit_security_level(con_handle, LEVEL_0); 2226 return; 2227 } 2228 gap_security_level_t current_level = gap_security_level(con_handle); 2229 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 2230 if (current_level >= requested_level){ 2231 hci_emit_security_level(con_handle, current_level); 2232 return; 2233 } 2234 2235 connection->requested_security_level = requested_level; 2236 2237 // would enabling ecnryption suffice (>= LEVEL_2)? 2238 if (hci_stack->remote_device_db){ 2239 link_key_type_t link_key_type; 2240 link_key_t link_key; 2241 if (hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type)){ 2242 if (gap_security_level_for_link_key_type(link_key_type) >= requested_level){ 2243 connection->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 2244 return; 2245 } 2246 } 2247 } 2248 2249 // try to authenticate connection 2250 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 2251 hci_run(); 2252 } 2253 2254 /** 2255 * @brief start dedicated bonding with device. disconnect after bonding 2256 * @param device 2257 * @param request MITM protection 2258 * @result GAP_DEDICATED_BONDING_COMPLETE 2259 */ 2260 int gap_dedicated_bonding(bd_addr_t device, int mitm_protection_required){ 2261 2262 // create connection state machine 2263 hci_connection_t * connection = create_connection_for_bd_addr_and_type(device, BD_ADDR_TYPE_CLASSIC); 2264 2265 if (!connection){ 2266 return BTSTACK_MEMORY_ALLOC_FAILED; 2267 } 2268 2269 // delete linkn key 2270 hci_drop_link_key_for_bd_addr( (bd_addr_t *) &device); 2271 2272 // configure LEVEL_2/3, dedicated bonding 2273 connection->state = SEND_CREATE_CONNECTION; 2274 connection->requested_security_level = mitm_protection_required ? LEVEL_3 : LEVEL_2; 2275 log_info("gap_dedicated_bonding, mitm %u -> level %u", mitm_protection_required, connection->requested_security_level); 2276 connection->bonding_flags = BONDING_DEDICATED; 2277 2278 // wait for GAP Security Result and send GAP Dedicated Bonding complete 2279 2280 // handle: connnection failure (connection complete != ok) 2281 // handle: authentication failure 2282 // handle: disconnect on done 2283 2284 hci_run(); 2285 2286 return 0; 2287 } 2288 2289 void gap_set_local_name(const char * local_name){ 2290 hci_stack->local_name = local_name; 2291 } 2292 2293 le_command_status_t le_central_start_scan(){ 2294 if (hci_stack->le_scanning_state == LE_SCANNING) return BLE_PERIPHERAL_OK; 2295 hci_stack->le_scanning_state = LE_START_SCAN; 2296 hci_run(); 2297 return BLE_PERIPHERAL_OK; 2298 } 2299 2300 le_command_status_t le_central_stop_scan(){ 2301 if ( hci_stack->le_scanning_state == LE_SCAN_IDLE) return BLE_PERIPHERAL_OK; 2302 hci_stack->le_scanning_state = LE_STOP_SCAN; 2303 hci_run(); 2304 return BLE_PERIPHERAL_OK; 2305 } 2306 2307 void le_central_set_scan_parameters(uint8_t scan_type, uint16_t scan_interval, uint16_t scan_window){ 2308 hci_stack->le_scan_type = scan_type; 2309 hci_stack->le_scan_interval = scan_interval; 2310 hci_stack->le_scan_window = scan_window; 2311 hci_run(); 2312 } 2313 2314 le_command_status_t le_central_connect(bd_addr_t * addr, bd_addr_type_t addr_type){ 2315 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 2316 if (!conn){ 2317 log_info("le_central_connect: no connection exists yet, creating context"); 2318 conn = create_connection_for_bd_addr_and_type(*addr, addr_type); 2319 if (!conn){ 2320 // notify client that alloc failed 2321 hci_emit_le_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 2322 log_info("le_central_connect: failed to alloc context"); 2323 return BLE_PERIPHERAL_NOT_CONNECTED; // don't sent packet to controller 2324 } 2325 conn->state = SEND_CREATE_CONNECTION; 2326 log_info("le_central_connect: send create connection next"); 2327 hci_run(); 2328 return BLE_PERIPHERAL_OK; 2329 } 2330 2331 if (!hci_is_le_connection(conn) || 2332 conn->state == SEND_CREATE_CONNECTION || 2333 conn->state == SENT_CREATE_CONNECTION) { 2334 hci_emit_le_connection_complete(conn, ERROR_CODE_COMMAND_DISALLOWED); 2335 log_error("le_central_connect: classic connection or connect is already being created"); 2336 return BLE_PERIPHERAL_IN_WRONG_STATE; 2337 } 2338 2339 log_info("le_central_connect: context exists with state %u", conn->state); 2340 hci_emit_le_connection_complete(conn, 0); 2341 hci_run(); 2342 return BLE_PERIPHERAL_OK; 2343 } 2344 2345 // @assumption: only a single outgoing LE Connection exists 2346 static hci_connection_t * le_central_get_outgoing_connection(){ 2347 linked_item_t *it; 2348 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 2349 hci_connection_t * conn = (hci_connection_t *) it; 2350 if (!hci_is_le_connection(conn)) continue; 2351 switch (conn->state){ 2352 case SEND_CREATE_CONNECTION: 2353 case SENT_CREATE_CONNECTION: 2354 return conn; 2355 default: 2356 break; 2357 }; 2358 } 2359 return NULL; 2360 } 2361 2362 le_command_status_t le_central_connect_cancel(){ 2363 hci_connection_t * conn = le_central_get_outgoing_connection(); 2364 switch (conn->state){ 2365 case SEND_CREATE_CONNECTION: 2366 // skip sending create connection and emit event instead 2367 hci_emit_le_connection_complete(conn, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 2368 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 2369 btstack_memory_hci_connection_free( conn ); 2370 break; 2371 case SENT_CREATE_CONNECTION: 2372 // request to send cancel connection 2373 conn->state = SEND_CANCEL_CONNECTION; 2374 hci_run(); 2375 break; 2376 default: 2377 break; 2378 } 2379 return BLE_PERIPHERAL_OK; 2380 } 2381 2382 le_command_status_t gap_disconnect(hci_con_handle_t handle){ 2383 hci_connection_t * conn = hci_connection_for_handle(handle); 2384 if (!conn){ 2385 hci_emit_disconnection_complete(handle, 0); 2386 return BLE_PERIPHERAL_OK; 2387 } 2388 conn->state = SEND_DISCONNECT; 2389 hci_run(); 2390 return BLE_PERIPHERAL_OK; 2391 } 2392 2393 void hci_disconnect_all(){ 2394 linked_list_iterator_t it; 2395 linked_list_iterator_init(&it, &hci_stack->connections); 2396 while (linked_list_iterator_has_next(&it)){ 2397 hci_connection_t * con = (hci_connection_t*) linked_list_iterator_next(&it); 2398 if (con->state == SENT_DISCONNECT) continue; 2399 con->state = SEND_DISCONNECT; 2400 } 2401 hci_run(); 2402 } 2403