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: connection for handle %u does not exist!", handle); 239 return 0; 240 } 241 return connection->num_acl_packets_sent; 242 } 243 244 uint8_t hci_number_free_acl_slots_for_handle(hci_con_handle_t con_handle){ 245 246 int num_packets_sent_classic = 0; 247 int num_packets_sent_le = 0; 248 249 bd_addr_type_t address_type = BD_ADDR_TYPE_UNKNOWN; 250 251 linked_item_t *it; 252 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 253 hci_connection_t * connection = (hci_connection_t *) it; 254 if (connection->address_type == BD_ADDR_TYPE_CLASSIC){ 255 num_packets_sent_classic += connection->num_acl_packets_sent; 256 } else { 257 num_packets_sent_le += connection->num_acl_packets_sent; 258 } 259 if (connection->con_handle == con_handle){ 260 address_type = connection->address_type; 261 } 262 } 263 264 int free_slots_classic = hci_stack->acl_packets_total_num - num_packets_sent_classic; 265 int free_slots_le = 0; 266 267 if (free_slots_classic < 0){ 268 log_error("hci_number_free_acl_slots: outgoing classic packets (%u) > total classic packets (%u)", num_packets_sent_classic, hci_stack->acl_packets_total_num); 269 return 0; 270 } 271 272 if (hci_stack->le_acl_packets_total_num){ 273 // if we have LE slots, they are used 274 free_slots_le = hci_stack->le_acl_packets_total_num - num_packets_sent_le; 275 if (free_slots_le < 0){ 276 log_error("hci_number_free_acl_slots: outgoing le packets (%u) > total le packets (%u)", num_packets_sent_le, hci_stack->le_acl_packets_total_num); 277 return 0; 278 } 279 } else { 280 // otherwise, classic slots are used for LE, too 281 free_slots_classic -= num_packets_sent_le; 282 if (free_slots_classic < 0){ 283 log_error("hci_number_free_acl_slots: outgoing classic + le packets (%u + %u) > total packets (%u)", num_packets_sent_classic, num_packets_sent_le, hci_stack->acl_packets_total_num); 284 return 0; 285 } 286 } 287 288 switch (address_type){ 289 case BD_ADDR_TYPE_UNKNOWN: 290 log_error("hci_number_free_acl_slots: handle 0x%04x not in connection list", con_handle); 291 return 0; 292 293 case BD_ADDR_TYPE_CLASSIC: 294 return free_slots_classic; 295 296 default: 297 return free_slots_le; 298 } 299 } 300 301 302 // @deprecated 303 int hci_can_send_packet_now(uint8_t packet_type){ 304 switch (packet_type) { 305 case HCI_ACL_DATA_PACKET: 306 return hci_can_send_prepared_acl_packet_now(0); 307 case HCI_COMMAND_DATA_PACKET: 308 return hci_can_send_command_packet_now(); 309 default: 310 return 0; 311 } 312 } 313 314 // @deprecated 315 // same as hci_can_send_packet_now, but also checks if packet buffer is free for use 316 int hci_can_send_packet_now_using_packet_buffer(uint8_t packet_type){ 317 318 if (hci_stack->hci_packet_buffer_reserved) return 0; 319 320 switch (packet_type) { 321 case HCI_ACL_DATA_PACKET: 322 return hci_can_send_acl_packet_now(0); 323 case HCI_COMMAND_DATA_PACKET: 324 return hci_can_send_command_packet_now(); 325 default: 326 return 0; 327 } 328 } 329 330 331 // new functions replacing hci_can_send_packet_now[_using_packet_buffer] 332 int hci_can_send_command_packet_now(void){ 333 if (hci_stack->hci_packet_buffer_reserved) return 0; 334 335 // check for async hci transport implementations 336 if (hci_stack->hci_transport->can_send_packet_now){ 337 if (!hci_stack->hci_transport->can_send_packet_now(HCI_COMMAND_DATA_PACKET)){ 338 return 0; 339 } 340 } 341 342 return hci_stack->num_cmd_packets > 0; 343 } 344 345 int hci_can_send_prepared_acl_packet_now(hci_con_handle_t con_handle) { 346 // check for async hci transport implementations 347 if (hci_stack->hci_transport->can_send_packet_now){ 348 if (!hci_stack->hci_transport->can_send_packet_now(HCI_ACL_DATA_PACKET)){ 349 return 0; 350 } 351 } 352 return hci_number_free_acl_slots_for_handle(con_handle) > 0; 353 } 354 355 int hci_can_send_acl_packet_now(hci_con_handle_t con_handle){ 356 if (hci_stack->hci_packet_buffer_reserved) return 0; 357 return hci_can_send_prepared_acl_packet_now(con_handle); 358 } 359 360 // used for internal checks in l2cap[-le].c 361 int hci_is_packet_buffer_reserved(void){ 362 return hci_stack->hci_packet_buffer_reserved; 363 } 364 365 // reserves outgoing packet buffer. @returns 1 if successful 366 int hci_reserve_packet_buffer(void){ 367 if (hci_stack->hci_packet_buffer_reserved) { 368 log_error("hci_reserve_packet_buffer called but buffer already reserved"); 369 return 0; 370 } 371 hci_stack->hci_packet_buffer_reserved = 1; 372 return 1; 373 } 374 375 void hci_release_packet_buffer(void){ 376 hci_stack->hci_packet_buffer_reserved = 0; 377 } 378 379 // assumption: synchronous implementations don't provide can_send_packet_now as they don't keep the buffer after the call 380 int hci_transport_synchronous(void){ 381 return hci_stack->hci_transport->can_send_packet_now == NULL; 382 } 383 384 // pre: caller has reserved the packet buffer 385 int hci_send_acl_packet_buffer(int size){ 386 387 if (!hci_stack->hci_packet_buffer_reserved) { 388 log_error("hci_send_acl_packet_buffer called without reserving packet buffer"); 389 return 0; 390 } 391 392 uint8_t * packet = hci_stack->hci_packet_buffer; 393 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 394 395 // check for free places on Bluetooth module 396 if (!hci_can_send_prepared_acl_packet_now(con_handle)) { 397 log_error("hci_send_acl_packet_buffer called but no free ACL buffers on controller"); 398 hci_release_packet_buffer(); 399 return BTSTACK_ACL_BUFFERS_FULL; 400 } 401 402 hci_connection_t *connection = hci_connection_for_handle( con_handle); 403 if (!connection) { 404 log_error("hci_send_acl_packet_buffer called but no connection for handle 0x%04x", con_handle); 405 hci_release_packet_buffer(); 406 return 0; 407 } 408 hci_connection_timestamp(connection); 409 410 // count packet 411 connection->num_acl_packets_sent++; 412 // log_info("hci_send_acl_packet - handle %u, sent %u", connection->con_handle, connection->num_acl_packets_sent); 413 414 // send packet 415 int err = hci_stack->hci_transport->send_packet(HCI_ACL_DATA_PACKET, packet, size); 416 417 // free packet buffer for synchronous transport implementations 418 if (hci_transport_synchronous()){ 419 hci_release_packet_buffer(); 420 } 421 422 return err; 423 } 424 425 static void acl_handler(uint8_t *packet, int size){ 426 427 // log_info("acl_handler: size %u", size); 428 429 // get info 430 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 431 hci_connection_t *conn = hci_connection_for_handle(con_handle); 432 uint8_t acl_flags = READ_ACL_FLAGS(packet); 433 uint16_t acl_length = READ_ACL_LENGTH(packet); 434 435 // ignore non-registered handle 436 if (!conn){ 437 log_error( "hci.c: acl_handler called with non-registered handle %u!" , con_handle); 438 return; 439 } 440 441 // assert packet is complete 442 if (acl_length + 4 != size){ 443 log_error("hci.c: acl_handler called with ACL packet of wrong size %u, expected %u => dropping packet", size, acl_length + 4); 444 return; 445 } 446 447 // update idle timestamp 448 hci_connection_timestamp(conn); 449 450 // handle different packet types 451 switch (acl_flags & 0x03) { 452 453 case 0x01: // continuation fragment 454 455 // sanity check 456 if (conn->acl_recombination_pos == 0) { 457 log_error( "ACL Cont Fragment but no first fragment for handle 0x%02x", con_handle); 458 return; 459 } 460 461 // append fragment payload (header already stored) 462 memcpy(&conn->acl_recombination_buffer[conn->acl_recombination_pos], &packet[4], acl_length ); 463 conn->acl_recombination_pos += acl_length; 464 465 // log_error( "ACL Cont Fragment: acl_len %u, combined_len %u, l2cap_len %u", acl_length, 466 // conn->acl_recombination_pos, conn->acl_recombination_length); 467 468 // forward complete L2CAP packet if complete. 469 if (conn->acl_recombination_pos >= conn->acl_recombination_length + 4 + 4){ // pos already incl. ACL header 470 471 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, conn->acl_recombination_buffer, conn->acl_recombination_pos); 472 // reset recombination buffer 473 conn->acl_recombination_length = 0; 474 conn->acl_recombination_pos = 0; 475 } 476 break; 477 478 case 0x02: { // first fragment 479 480 // sanity check 481 if (conn->acl_recombination_pos) { 482 log_error( "ACL First Fragment but data in buffer for handle 0x%02x", con_handle); 483 return; 484 } 485 486 // peek into L2CAP packet! 487 uint16_t l2cap_length = READ_L2CAP_LENGTH( packet ); 488 489 // log_info( "ACL First Fragment: acl_len %u, l2cap_len %u", acl_length, l2cap_length); 490 491 // compare fragment size to L2CAP packet size 492 if (acl_length >= l2cap_length + 4){ 493 494 // forward fragment as L2CAP packet 495 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, packet, acl_length + 4); 496 497 } else { 498 // store first fragment and tweak acl length for complete package 499 memcpy(conn->acl_recombination_buffer, packet, acl_length + 4); 500 conn->acl_recombination_pos = acl_length + 4; 501 conn->acl_recombination_length = l2cap_length; 502 bt_store_16(conn->acl_recombination_buffer, 2, l2cap_length +4); 503 } 504 break; 505 506 } 507 default: 508 log_error( "hci.c: acl_handler called with invalid packet boundary flags %u", acl_flags & 0x03); 509 return; 510 } 511 512 // execute main loop 513 hci_run(); 514 } 515 516 static void hci_shutdown_connection(hci_connection_t *conn){ 517 log_info("Connection closed: handle 0x%x, %s", conn->con_handle, bd_addr_to_str(conn->address)); 518 519 run_loop_remove_timer(&conn->timeout); 520 521 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 522 btstack_memory_hci_connection_free( conn ); 523 524 // now it's gone 525 hci_emit_nr_connections_changed(); 526 } 527 528 static const uint16_t packet_type_sizes[] = { 529 0, HCI_ACL_2DH1_SIZE, HCI_ACL_3DH1_SIZE, HCI_ACL_DM1_SIZE, 530 HCI_ACL_DH1_SIZE, 0, 0, 0, 531 HCI_ACL_2DH3_SIZE, HCI_ACL_3DH3_SIZE, HCI_ACL_DM3_SIZE, HCI_ACL_DH3_SIZE, 532 HCI_ACL_2DH5_SIZE, HCI_ACL_3DH5_SIZE, HCI_ACL_DM5_SIZE, HCI_ACL_DH5_SIZE 533 }; 534 static const uint8_t packet_type_feature_requirement_bit[] = { 535 0, // 3 slot packets 536 1, // 5 slot packets 537 25, // EDR 2 mpbs 538 26, // EDR 3 mbps 539 39, // 3 slot EDR packts 540 40, // 5 slot EDR packet 541 }; 542 static const uint16_t packet_type_feature_packet_mask[] = { 543 0x0f00, // 3 slot packets 544 0xf000, // 5 slot packets 545 0x1102, // EDR 2 mpbs 546 0x2204, // EDR 3 mbps 547 0x0300, // 3 slot EDR packts 548 0x3000, // 5 slot EDR packet 549 }; 550 551 static uint16_t hci_acl_packet_types_for_buffer_size_and_local_features(uint16_t buffer_size, uint8_t * local_supported_features){ 552 // enable packet types based on size 553 uint16_t packet_types = 0; 554 int i; 555 for (i=0;i<16;i++){ 556 if (packet_type_sizes[i] == 0) continue; 557 if (packet_type_sizes[i] <= buffer_size){ 558 packet_types |= 1 << i; 559 } 560 } 561 // disable packet types due to missing local supported features 562 for (i=0;i<sizeof(packet_type_feature_requirement_bit);i++){ 563 int bit_idx = packet_type_feature_requirement_bit[i]; 564 int feature_set = (local_supported_features[bit_idx >> 3] & (1<<(bit_idx & 7))) != 0; 565 if (feature_set) continue; 566 log_info("Features bit %02u is not set, removing packet types 0x%04x", bit_idx, packet_type_feature_packet_mask[i]); 567 packet_types &= ~packet_type_feature_packet_mask[i]; 568 } 569 // flip bits for "may not be used" 570 packet_types ^= 0x3306; 571 return packet_types; 572 } 573 574 uint16_t hci_usable_acl_packet_types(void){ 575 return hci_stack->packet_types; 576 } 577 578 uint8_t* hci_get_outgoing_packet_buffer(void){ 579 // hci packet buffer is >= acl data packet length 580 return hci_stack->hci_packet_buffer; 581 } 582 583 uint16_t hci_max_acl_data_packet_length(void){ 584 return hci_stack->acl_data_packet_length; 585 } 586 587 int hci_non_flushable_packet_boundary_flag_supported(void){ 588 // No. 54, byte 6, bit 6 589 return (hci_stack->local_supported_features[6] & (1 << 6)) != 0; 590 } 591 592 int hci_ssp_supported(void){ 593 // No. 51, byte 6, bit 3 594 return (hci_stack->local_supported_features[6] & (1 << 3)) != 0; 595 } 596 597 int hci_classic_supported(void){ 598 // No. 37, byte 4, bit 5, = No BR/EDR Support 599 return (hci_stack->local_supported_features[4] & (1 << 5)) == 0; 600 } 601 602 int hci_le_supported(void){ 603 #ifdef HAVE_BLE 604 // No. 37, byte 4, bit 6 = LE Supported (Controller) 605 return (hci_stack->local_supported_features[4] & (1 << 6)) != 0; 606 #else 607 return 0; 608 #endif 609 } 610 611 // get addr type and address used in advertisement packets 612 void hci_le_advertisement_address(uint8_t * addr_type, bd_addr_t * addr){ 613 *addr_type = hci_stack->adv_addr_type; 614 if (hci_stack->adv_addr_type){ 615 memcpy(addr, hci_stack->adv_address, 6); 616 } else { 617 memcpy(addr, hci_stack->local_bd_addr, 6); 618 } 619 } 620 621 #ifdef HAVE_BLE 622 void le_handle_advertisement_report(uint8_t *packet, int size){ 623 int offset = 3; 624 int num_reports = packet[offset]; 625 offset += 1; 626 627 int i; 628 int total_data_length = 0; 629 630 for (i=0; i<num_reports;i++){ 631 total_data_length += packet[4+num_reports*8+i]; 632 } 633 634 log_info("num reports: %d, ", num_reports); 635 for (i=0; i<num_reports;i++){ 636 uint8_t data_length = packet[offset + 9]; 637 uint8_t event_size = 10 + data_length; 638 uint8_t event[2 + event_size ]; 639 int pos = 0; 640 event[pos++] = GAP_LE_ADVERTISING_REPORT; 641 event[pos++] = event_size; 642 memcpy(&event[pos], &packet[offset], 1+1+6); // bt address 643 offset += 8; 644 pos += 8; 645 event[pos++] = packet[offset + 1 + data_length]; // rssi 646 event[pos++] = packet[offset++]; //data_length; 647 memcpy(&event[pos], &packet[offset], data_length); 648 pos += data_length; 649 offset += data_length + 1; // rssi 650 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 651 } 652 } 653 #endif 654 655 static void hci_initializing_event_handler(uint8_t * packet, uint16_t size){ 656 uint8_t command_completed = 0; 657 if ((hci_stack->substate % 2) == 0) return; 658 // odd: waiting for event 659 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 660 uint16_t opcode = READ_BT_16(packet,3); 661 if (opcode == hci_stack->last_cmd_opcode){ 662 command_completed = 1; 663 log_info("Command complete for expected opcode %04x -> new substate %u", opcode, hci_stack->substate); 664 } else { 665 log_info("Command complete for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 666 } 667 } 668 if (packet[0] == HCI_EVENT_COMMAND_STATUS){ 669 uint8_t status = packet[2]; 670 uint16_t opcode = READ_BT_16(packet,4); 671 if (opcode == hci_stack->last_cmd_opcode){ 672 if (status){ 673 command_completed = 1; 674 log_error("Command status error 0x%02x for expected opcode %04x -> new substate %u", status, opcode, hci_stack->substate); 675 } else { 676 log_info("Command status OK for expected opcode %04x, waiting for command complete", opcode); 677 } 678 } else { 679 log_info("Command status for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 680 } 681 } 682 683 if (!command_completed) return; 684 685 switch(hci_stack->substate >> 1){ 686 default: 687 hci_stack->substate++; 688 break; 689 } 690 } 691 692 static void hci_initializing_state_machine(){ 693 // log_info("hci_init: substate %u", hci_stack->substate); 694 if (hci_stack->substate % 2) { 695 // odd: waiting for command completion 696 return; 697 } 698 switch (hci_stack->substate >> 1){ 699 case 0: // RESET 700 hci_state_reset(); 701 702 hci_send_cmd(&hci_reset); 703 if (hci_stack->config == NULL || ((hci_uart_config_t *)hci_stack->config)->baudrate_main == 0){ 704 // skip baud change 705 hci_stack->substate = 4; // >> 1 = 2 706 } 707 break; 708 case 1: // SEND BAUD CHANGE 709 hci_stack->control->baudrate_cmd(hci_stack->config, ((hci_uart_config_t *)hci_stack->config)->baudrate_main, hci_stack->hci_packet_buffer); 710 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 711 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 712 break; 713 case 2: // LOCAL BAUD CHANGE 714 log_info("Local baud rate change"); 715 hci_stack->hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack->config)->baudrate_main); 716 hci_stack->substate += 2; 717 // break missing here for fall through 718 719 case 3: 720 log_info("Custom init"); 721 // Custom initialization 722 if (hci_stack->control && hci_stack->control->next_cmd){ 723 int valid_cmd = (*hci_stack->control->next_cmd)(hci_stack->config, hci_stack->hci_packet_buffer); 724 if (valid_cmd){ 725 int size = 3 + hci_stack->hci_packet_buffer[2]; 726 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 727 hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack->hci_packet_buffer, size); 728 hci_stack->substate = 4; // more init commands 729 break; 730 } 731 log_info("hci_run: init script done"); 732 } 733 // otherwise continue 734 hci_send_cmd(&hci_read_bd_addr); 735 break; 736 case 4: 737 hci_send_cmd(&hci_read_buffer_size); 738 break; 739 case 5: 740 hci_send_cmd(&hci_read_local_supported_features); 741 break; 742 case 6: 743 if (hci_le_supported()){ 744 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 745 } else { 746 // Kensington Bluetoot 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 747 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 748 } 749 750 // skip Classic init commands for LE only chipsets 751 if (!hci_classic_supported()){ 752 if (hci_le_supported()){ 753 hci_stack->substate = 11 << 1; // skip all classic command 754 } else { 755 log_error("Neither BR/EDR nor LE supported"); 756 hci_stack->substate = 14 << 1; // skip all 757 } 758 } 759 break; 760 case 7: 761 if (hci_ssp_supported()){ 762 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack->ssp_enable); 763 break; 764 } 765 hci_stack->substate += 2; 766 // break missing here for fall through 767 768 case 8: 769 // ca. 15 sec 770 hci_send_cmd(&hci_write_page_timeout, 0x6000); 771 break; 772 case 9: 773 hci_send_cmd(&hci_write_class_of_device, hci_stack->class_of_device); 774 break; 775 case 10: 776 if (hci_stack->local_name){ 777 hci_send_cmd(&hci_write_local_name, hci_stack->local_name); 778 } else { 779 char hostname[30]; 780 #ifdef EMBEDDED 781 // BTstack-11:22:33:44:55:66 782 strcpy(hostname, "BTstack "); 783 strcat(hostname, bd_addr_to_str(hci_stack->local_bd_addr)); 784 log_info("---> Name %s", hostname); 785 #else 786 // hostname for POSIX systems 787 gethostname(hostname, 30); 788 hostname[29] = '\0'; 789 #endif 790 hci_send_cmd(&hci_write_local_name, hostname); 791 } 792 break; 793 case 11: 794 hci_send_cmd(&hci_write_scan_enable, (hci_stack->connectable << 1) | hci_stack->discoverable); // page scan 795 if (!hci_le_supported()){ 796 // SKIP LE init for Classic only configuration 797 hci_stack->substate = 14 << 1; 798 } 799 break; 800 801 #ifdef HAVE_BLE 802 // LE INIT 803 case 12: 804 hci_send_cmd(&hci_le_read_buffer_size); 805 break; 806 case 13: 807 // LE Supported Host = 1, Simultaneous Host = 0 808 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 809 break; 810 case 14: 811 // LE Scan Parameters: active scanning, 300 ms interval, 30 ms window, public address, accept all advs 812 hci_send_cmd(&hci_le_set_scan_parameters, 1, 0x1e0, 0x30, 0, 0); 813 break; 814 #endif 815 816 // DONE 817 case 15: 818 // done. 819 hci_stack->state = HCI_STATE_WORKING; 820 hci_emit_state(); 821 break; 822 default: 823 break; 824 } 825 hci_stack->substate++; 826 } 827 828 // avoid huge local variables 829 #ifndef EMBEDDED 830 static device_name_t device_name; 831 #endif 832 static void event_handler(uint8_t *packet, int size){ 833 834 uint16_t event_length = packet[1]; 835 836 // assert packet is complete 837 if (size != event_length + 2){ 838 log_error("hci.c: event_handler called with event packet of wrong size %u, expected %u => dropping packet", size, event_length + 2); 839 return; 840 } 841 842 bd_addr_t addr; 843 bd_addr_type_t addr_type; 844 uint8_t link_type; 845 hci_con_handle_t handle; 846 hci_connection_t * conn; 847 int i; 848 849 // log_info("HCI:EVENT:%02x", packet[0]); 850 851 switch (packet[0]) { 852 853 case HCI_EVENT_COMMAND_COMPLETE: 854 // get num cmd packets 855 // log_info("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u", hci_stack->num_cmd_packets, packet[2]); 856 hci_stack->num_cmd_packets = packet[2]; 857 858 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 859 // from offset 5 860 // status 861 // "The HC_ACL_Data_Packet_Length return parameter will be used to determine the size of the L2CAP segments contained in ACL Data Packets" 862 hci_stack->acl_data_packet_length = READ_BT_16(packet, 6); 863 // ignore: SCO data packet len (8) 864 hci_stack->acl_packets_total_num = packet[9]; 865 // ignore: total num SCO packets 866 if (hci_stack->state == HCI_STATE_INITIALIZING){ 867 // determine usable ACL payload size 868 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->acl_data_packet_length){ 869 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 870 } 871 log_info("hci_read_buffer_size: used size %u, count %u", 872 hci_stack->acl_data_packet_length, hci_stack->acl_packets_total_num); 873 } 874 } 875 #ifdef HAVE_BLE 876 if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_buffer_size)){ 877 hci_stack->le_data_packets_length = READ_BT_16(packet, 6); 878 hci_stack->le_acl_packets_total_num = packet[8]; 879 log_info("hci_le_read_buffer_size: size %u, count %u", hci_stack->le_data_packets_length, hci_stack->le_acl_packets_total_num); 880 } 881 #endif 882 // Dump local address 883 if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)) { 884 bt_flip_addr(hci_stack->local_bd_addr, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1]); 885 log_info("Local Address, Status: 0x%02x: Addr: %s", 886 packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE], bd_addr_to_str(hci_stack->local_bd_addr)); 887 } 888 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 889 hci_emit_discoverable_enabled(hci_stack->discoverable); 890 } 891 // Note: HCI init checks 892 if (COMMAND_COMPLETE_EVENT(packet, hci_read_local_supported_features)){ 893 memcpy(hci_stack->local_supported_features, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1], 8); 894 log_info("Local Supported Features: 0x%02x%02x%02x%02x%02x%02x%02x%02x", 895 hci_stack->local_supported_features[0], hci_stack->local_supported_features[1], 896 hci_stack->local_supported_features[2], hci_stack->local_supported_features[3], 897 hci_stack->local_supported_features[4], hci_stack->local_supported_features[5], 898 hci_stack->local_supported_features[6], hci_stack->local_supported_features[7]); 899 900 // determine usable ACL packet types based buffer size and supported features 901 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]); 902 log_info("packet types %04x", hci_stack->packet_types); 903 904 // Classic/LE 905 log_info("BR/EDR support %u, LE support %u", hci_classic_supported(), hci_le_supported()); 906 } 907 break; 908 909 case HCI_EVENT_COMMAND_STATUS: 910 // get num cmd packets 911 // log_info("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u", hci_stack->num_cmd_packets, packet[3]); 912 hci_stack->num_cmd_packets = packet[3]; 913 break; 914 915 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:{ 916 int offset = 3; 917 for (i=0; i<packet[2];i++){ 918 handle = READ_BT_16(packet, offset); 919 offset += 2; 920 uint16_t num_packets = READ_BT_16(packet, offset); 921 offset += 2; 922 923 conn = hci_connection_for_handle(handle); 924 if (!conn){ 925 log_error("hci_number_completed_packet lists unused con handle %u", handle); 926 continue; 927 } 928 conn->num_acl_packets_sent -= num_packets; 929 // log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u", num_packets, handle, conn->num_acl_packets_sent); 930 } 931 break; 932 } 933 case HCI_EVENT_CONNECTION_REQUEST: 934 bt_flip_addr(addr, &packet[2]); 935 // TODO: eval COD 8-10 936 link_type = packet[11]; 937 log_info("Connection_incoming: %s, type %u", bd_addr_to_str(addr), link_type); 938 if (link_type == 1) { // ACL 939 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 940 if (!conn) { 941 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 942 } 943 if (!conn) { 944 // CONNECTION REJECTED DUE TO LIMITED RESOURCES (0X0D) 945 hci_stack->decline_reason = 0x0d; 946 BD_ADDR_COPY(hci_stack->decline_addr, addr); 947 break; 948 } 949 conn->state = RECEIVED_CONNECTION_REQUEST; 950 hci_run(); 951 } else { 952 // SYNCHRONOUS CONNECTION LIMIT TO A DEVICE EXCEEDED (0X0A) 953 hci_stack->decline_reason = 0x0a; 954 BD_ADDR_COPY(hci_stack->decline_addr, addr); 955 } 956 break; 957 958 case HCI_EVENT_CONNECTION_COMPLETE: 959 // Connection management 960 bt_flip_addr(addr, &packet[5]); 961 log_info("Connection_complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 962 addr_type = BD_ADDR_TYPE_CLASSIC; 963 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 964 if (conn) { 965 if (!packet[2]){ 966 conn->state = OPEN; 967 conn->con_handle = READ_BT_16(packet, 3); 968 conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES; 969 970 // restart timer 971 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 972 run_loop_add_timer(&conn->timeout); 973 974 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 975 976 hci_emit_nr_connections_changed(); 977 } else { 978 int notify_dedicated_bonding_failed = conn->bonding_flags & BONDING_DEDICATED; 979 uint8_t status = packet[2]; 980 bd_addr_t bd_address; 981 memcpy(&bd_address, conn->address, 6); 982 983 // connection failed, remove entry 984 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 985 btstack_memory_hci_connection_free( conn ); 986 987 // notify client if dedicated bonding 988 if (notify_dedicated_bonding_failed){ 989 log_info("hci notify_dedicated_bonding_failed"); 990 hci_emit_dedicated_bonding_result(bd_address, status); 991 } 992 993 // if authentication error, also delete link key 994 if (packet[2] == 0x05) { 995 hci_drop_link_key_for_bd_addr(&addr); 996 } 997 } 998 } 999 break; 1000 1001 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 1002 handle = READ_BT_16(packet, 3); 1003 conn = hci_connection_for_handle(handle); 1004 if (!conn) break; 1005 if (!packet[2]){ 1006 uint8_t * features = &packet[5]; 1007 if (features[6] & (1 << 3)){ 1008 conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP; 1009 } 1010 } 1011 conn->bonding_flags |= BONDING_RECEIVED_REMOTE_FEATURES; 1012 log_info("HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE, bonding flags %x", conn->bonding_flags); 1013 if (conn->bonding_flags & BONDING_DEDICATED){ 1014 conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 1015 } 1016 break; 1017 1018 case HCI_EVENT_LINK_KEY_REQUEST: 1019 log_info("HCI_EVENT_LINK_KEY_REQUEST"); 1020 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 1021 // non-bondable mode: link key negative reply will be sent by HANDLE_LINK_KEY_REQUEST 1022 if (hci_stack->bondable && !hci_stack->remote_device_db) break; 1023 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], HANDLE_LINK_KEY_REQUEST); 1024 hci_run(); 1025 // request handled by hci_run() as HANDLE_LINK_KEY_REQUEST gets set 1026 return; 1027 1028 case HCI_EVENT_LINK_KEY_NOTIFICATION: { 1029 bt_flip_addr(addr, &packet[2]); 1030 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1031 if (!conn) break; 1032 conn->authentication_flags |= RECV_LINK_KEY_NOTIFICATION; 1033 link_key_type_t link_key_type = (link_key_type_t)packet[24]; 1034 // Change Connection Encryption keeps link key type 1035 if (link_key_type != CHANGED_COMBINATION_KEY){ 1036 conn->link_key_type = link_key_type; 1037 } 1038 if (!hci_stack->remote_device_db) break; 1039 hci_stack->remote_device_db->put_link_key(&addr, (link_key_t *) &packet[8], conn->link_key_type); 1040 // still forward event to allow dismiss of pairing dialog 1041 break; 1042 } 1043 1044 case HCI_EVENT_PIN_CODE_REQUEST: 1045 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], LEGACY_PAIRING_ACTIVE); 1046 // non-bondable mode: pin code negative reply will be sent 1047 if (!hci_stack->bondable){ 1048 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], DENY_PIN_CODE_REQUEST); 1049 hci_run(); 1050 return; 1051 } 1052 // PIN CODE REQUEST means the link key request didn't succee -> delete stored link key 1053 if (!hci_stack->remote_device_db) break; 1054 bt_flip_addr(addr, &packet[2]); 1055 hci_stack->remote_device_db->delete_link_key(&addr); 1056 break; 1057 1058 case HCI_EVENT_IO_CAPABILITY_REQUEST: 1059 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_IO_CAPABILITIES_REQUEST); 1060 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_IO_CAPABILITIES_REPLY); 1061 break; 1062 1063 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 1064 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1065 if (!hci_stack->ssp_auto_accept) break; 1066 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_CONFIRM_REPLY); 1067 break; 1068 1069 case HCI_EVENT_USER_PASSKEY_REQUEST: 1070 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1071 if (!hci_stack->ssp_auto_accept) break; 1072 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_PASSKEY_REPLY); 1073 break; 1074 1075 case HCI_EVENT_ENCRYPTION_CHANGE: 1076 handle = READ_BT_16(packet, 3); 1077 conn = hci_connection_for_handle(handle); 1078 if (!conn) break; 1079 if (packet[2] == 0) { 1080 if (packet[5]){ 1081 conn->authentication_flags |= CONNECTION_ENCRYPTED; 1082 } else { 1083 conn->authentication_flags &= ~CONNECTION_ENCRYPTED; 1084 } 1085 } 1086 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1087 break; 1088 1089 case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT: 1090 handle = READ_BT_16(packet, 3); 1091 conn = hci_connection_for_handle(handle); 1092 if (!conn) break; 1093 1094 // dedicated bonding: send result and disconnect 1095 if (conn->bonding_flags & BONDING_DEDICATED){ 1096 conn->bonding_flags &= ~BONDING_DEDICATED; 1097 conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE; 1098 conn->bonding_status = packet[2]; 1099 break; 1100 } 1101 1102 if (packet[2] == 0 && gap_security_level_for_link_key_type(conn->link_key_type) >= conn->requested_security_level){ 1103 // link key sufficient for requested security 1104 conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 1105 break; 1106 } 1107 // not enough 1108 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1109 break; 1110 1111 #ifndef EMBEDDED 1112 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 1113 if (!hci_stack->remote_device_db) break; 1114 if (packet[2]) break; // status not ok 1115 bt_flip_addr(addr, &packet[3]); 1116 // fix for invalid remote names - terminate on 0xff 1117 for (i=0; i<248;i++){ 1118 if (packet[9+i] == 0xff){ 1119 packet[9+i] = 0; 1120 break; 1121 } 1122 } 1123 memset(&device_name, 0, sizeof(device_name_t)); 1124 strncpy((char*) device_name, (char*) &packet[9], 248); 1125 hci_stack->remote_device_db->put_name(&addr, &device_name); 1126 break; 1127 1128 case HCI_EVENT_INQUIRY_RESULT: 1129 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:{ 1130 if (!hci_stack->remote_device_db) break; 1131 // first send inq result packet 1132 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1133 // then send cached remote names 1134 int offset = 3; 1135 for (i=0; i<packet[2];i++){ 1136 bt_flip_addr(addr, &packet[offset]); 1137 offset += 14; // 6 + 1 + 1 + 1 + 3 + 2; 1138 if (hci_stack->remote_device_db->get_name(&addr, &device_name)){ 1139 hci_emit_remote_name_cached(&addr, &device_name); 1140 } 1141 } 1142 return; 1143 } 1144 #endif 1145 1146 case HCI_EVENT_DISCONNECTION_COMPLETE: 1147 if (!packet[2]){ 1148 handle = READ_BT_16(packet, 3); 1149 hci_connection_t * conn = hci_connection_for_handle(handle); 1150 if (conn) { 1151 uint8_t status = conn->bonding_status; 1152 bd_addr_t bd_address; 1153 memcpy(&bd_address, conn->address, 6); 1154 hci_shutdown_connection(conn); 1155 if (conn->bonding_flags & BONDING_EMIT_COMPLETE_ON_DISCONNECT){ 1156 hci_emit_dedicated_bonding_result(bd_address, status); 1157 } 1158 } 1159 } 1160 break; 1161 1162 case HCI_EVENT_HARDWARE_ERROR: 1163 if(hci_stack->control && hci_stack->control->hw_error){ 1164 (*hci_stack->control->hw_error)(); 1165 } else { 1166 // if no special requests, just reboot stack 1167 hci_power_control_off(); 1168 hci_power_control_on(); 1169 } 1170 break; 1171 1172 case DAEMON_EVENT_HCI_PACKET_SENT: 1173 // free packet buffer for asynchronous transport 1174 if (hci_transport_synchronous()) break; 1175 hci_stack->hci_packet_buffer_reserved = 0; 1176 break; 1177 1178 #ifdef HAVE_BLE 1179 case HCI_EVENT_LE_META: 1180 switch (packet[2]){ 1181 case HCI_SUBEVENT_LE_ADVERTISING_REPORT: 1182 log_info("advertising report received"); 1183 if (hci_stack->le_scanning_state != LE_SCANNING) break; 1184 le_handle_advertisement_report(packet, size); 1185 break; 1186 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 1187 // Connection management 1188 bt_flip_addr(addr, &packet[8]); 1189 addr_type = (bd_addr_type_t)packet[7]; 1190 log_info("LE Connection_complete (status=%u) type %u, %s", packet[3], addr_type, bd_addr_to_str(addr)); 1191 // LE connections are auto-accepted, so just create a connection if there isn't one already 1192 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1193 if (packet[3]){ 1194 if (conn){ 1195 // outgoing connection failed, remove entry 1196 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1197 btstack_memory_hci_connection_free( conn ); 1198 } 1199 // if authentication error, also delete link key 1200 if (packet[3] == 0x05) { 1201 hci_drop_link_key_for_bd_addr(&addr); 1202 } 1203 break; 1204 } 1205 if (!conn){ 1206 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 1207 } 1208 if (!conn){ 1209 // no memory 1210 break; 1211 } 1212 1213 conn->state = OPEN; 1214 conn->con_handle = READ_BT_16(packet, 4); 1215 1216 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 1217 1218 // restart timer 1219 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1220 // run_loop_add_timer(&conn->timeout); 1221 1222 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1223 1224 hci_emit_nr_connections_changed(); 1225 break; 1226 1227 // log_info("LE buffer size: %u, count %u", READ_BT_16(packet,6), packet[8]); 1228 1229 default: 1230 break; 1231 } 1232 break; 1233 #endif 1234 default: 1235 break; 1236 } 1237 1238 // handle BT initialization 1239 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1240 hci_initializing_event_handler(packet, size); 1241 } 1242 1243 // help with BT sleep 1244 if (hci_stack->state == HCI_STATE_FALLING_ASLEEP 1245 && hci_stack->substate == 1 1246 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1247 hci_stack->substate++; 1248 } 1249 1250 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1251 1252 // execute main loop 1253 hci_run(); 1254 } 1255 1256 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1257 switch (packet_type) { 1258 case HCI_EVENT_PACKET: 1259 event_handler(packet, size); 1260 break; 1261 case HCI_ACL_DATA_PACKET: 1262 acl_handler(packet, size); 1263 break; 1264 default: 1265 break; 1266 } 1267 } 1268 1269 /** Register HCI packet handlers */ 1270 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 1271 hci_stack->packet_handler = handler; 1272 } 1273 1274 static void hci_state_reset(){ 1275 // no connections yet 1276 hci_stack->connections = NULL; 1277 1278 // keep discoverable/connectable as this has been requested by the client(s) 1279 // hci_stack->discoverable = 0; 1280 // hci_stack->connectable = 0; 1281 // hci_stack->bondable = 1; 1282 1283 // buffer is free 1284 hci_stack->hci_packet_buffer_reserved = 0; 1285 1286 // no pending cmds 1287 hci_stack->decline_reason = 0; 1288 hci_stack->new_scan_enable_value = 0xff; 1289 1290 // LE 1291 hci_stack->adv_addr_type = 0; 1292 memset(hci_stack->adv_address, 0, 6); 1293 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1294 hci_stack->le_scan_type = 0xff; 1295 } 1296 1297 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 1298 1299 #ifdef HAVE_MALLOC 1300 if (!hci_stack) { 1301 hci_stack = (hci_stack_t*) malloc(sizeof(hci_stack_t)); 1302 } 1303 #else 1304 hci_stack = &hci_stack_static; 1305 #endif 1306 memset(hci_stack, 0, sizeof(hci_stack_t)); 1307 1308 // reference to use transport layer implementation 1309 hci_stack->hci_transport = transport; 1310 1311 // references to used control implementation 1312 hci_stack->control = control; 1313 1314 // reference to used config 1315 hci_stack->config = config; 1316 1317 // higher level handler 1318 hci_stack->packet_handler = dummy_handler; 1319 1320 // store and open remote device db 1321 hci_stack->remote_device_db = remote_device_db; 1322 if (hci_stack->remote_device_db) { 1323 hci_stack->remote_device_db->open(); 1324 } 1325 1326 // max acl payload size defined in config.h 1327 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1328 1329 // register packet handlers with transport 1330 transport->register_packet_handler(&packet_handler); 1331 1332 hci_stack->state = HCI_STATE_OFF; 1333 1334 // class of device 1335 hci_stack->class_of_device = 0x007a020c; // Smartphone 1336 1337 // bondable by default 1338 hci_stack->bondable = 1; 1339 1340 // Secure Simple Pairing default: enable, no I/O capabilities, general bonding, mitm not required, auto accept 1341 hci_stack->ssp_enable = 1; 1342 hci_stack->ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 1343 hci_stack->ssp_authentication_requirement = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING; 1344 hci_stack->ssp_auto_accept = 1; 1345 1346 hci_state_reset(); 1347 } 1348 1349 void hci_close(){ 1350 // close remote device db 1351 if (hci_stack->remote_device_db) { 1352 hci_stack->remote_device_db->close(); 1353 } 1354 while (hci_stack->connections) { 1355 // cancel all l2cap connections 1356 hci_emit_disconnection_complete(((hci_connection_t *) hci_stack->connections)->con_handle, 0x16); // terminated by local host 1357 hci_shutdown_connection((hci_connection_t *) hci_stack->connections); 1358 } 1359 hci_power_control(HCI_POWER_OFF); 1360 1361 #ifdef HAVE_MALLOC 1362 free(hci_stack); 1363 #endif 1364 hci_stack = NULL; 1365 } 1366 1367 void hci_set_class_of_device(uint32_t class_of_device){ 1368 hci_stack->class_of_device = class_of_device; 1369 } 1370 1371 void hci_disable_l2cap_timeout_check(){ 1372 disable_l2cap_timeouts = 1; 1373 } 1374 // State-Module-Driver overview 1375 // state module low-level 1376 // HCI_STATE_OFF off close 1377 // HCI_STATE_INITIALIZING, on open 1378 // HCI_STATE_WORKING, on open 1379 // HCI_STATE_HALTING, on open 1380 // HCI_STATE_SLEEPING, off/sleep close 1381 // HCI_STATE_FALLING_ASLEEP on open 1382 1383 static int hci_power_control_on(void){ 1384 1385 // power on 1386 int err = 0; 1387 if (hci_stack->control && hci_stack->control->on){ 1388 err = (*hci_stack->control->on)(hci_stack->config); 1389 } 1390 if (err){ 1391 log_error( "POWER_ON failed"); 1392 hci_emit_hci_open_failed(); 1393 return err; 1394 } 1395 1396 // open low-level device 1397 err = hci_stack->hci_transport->open(hci_stack->config); 1398 if (err){ 1399 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1400 if (hci_stack->control && hci_stack->control->off){ 1401 (*hci_stack->control->off)(hci_stack->config); 1402 } 1403 hci_emit_hci_open_failed(); 1404 return err; 1405 } 1406 return 0; 1407 } 1408 1409 static void hci_power_control_off(void){ 1410 1411 log_info("hci_power_control_off"); 1412 1413 // close low-level device 1414 hci_stack->hci_transport->close(hci_stack->config); 1415 1416 log_info("hci_power_control_off - hci_transport closed"); 1417 1418 // power off 1419 if (hci_stack->control && hci_stack->control->off){ 1420 (*hci_stack->control->off)(hci_stack->config); 1421 } 1422 1423 log_info("hci_power_control_off - control closed"); 1424 1425 hci_stack->state = HCI_STATE_OFF; 1426 } 1427 1428 static void hci_power_control_sleep(void){ 1429 1430 log_info("hci_power_control_sleep"); 1431 1432 #if 0 1433 // don't close serial port during sleep 1434 1435 // close low-level device 1436 hci_stack->hci_transport->close(hci_stack->config); 1437 #endif 1438 1439 // sleep mode 1440 if (hci_stack->control && hci_stack->control->sleep){ 1441 (*hci_stack->control->sleep)(hci_stack->config); 1442 } 1443 1444 hci_stack->state = HCI_STATE_SLEEPING; 1445 } 1446 1447 static int hci_power_control_wake(void){ 1448 1449 log_info("hci_power_control_wake"); 1450 1451 // wake on 1452 if (hci_stack->control && hci_stack->control->wake){ 1453 (*hci_stack->control->wake)(hci_stack->config); 1454 } 1455 1456 #if 0 1457 // open low-level device 1458 int err = hci_stack->hci_transport->open(hci_stack->config); 1459 if (err){ 1460 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1461 if (hci_stack->control && hci_stack->control->off){ 1462 (*hci_stack->control->off)(hci_stack->config); 1463 } 1464 hci_emit_hci_open_failed(); 1465 return err; 1466 } 1467 #endif 1468 1469 return 0; 1470 } 1471 1472 static void hci_power_transition_to_initializing(void){ 1473 // set up state machine 1474 hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent 1475 hci_stack->hci_packet_buffer_reserved = 0; 1476 hci_stack->state = HCI_STATE_INITIALIZING; 1477 hci_stack->substate = 0; 1478 } 1479 1480 int hci_power_control(HCI_POWER_MODE power_mode){ 1481 1482 log_info("hci_power_control: %u, current mode %u", power_mode, hci_stack->state); 1483 1484 int err = 0; 1485 switch (hci_stack->state){ 1486 1487 case HCI_STATE_OFF: 1488 switch (power_mode){ 1489 case HCI_POWER_ON: 1490 err = hci_power_control_on(); 1491 if (err) { 1492 log_error("hci_power_control_on() error %u", err); 1493 return err; 1494 } 1495 hci_power_transition_to_initializing(); 1496 break; 1497 case HCI_POWER_OFF: 1498 // do nothing 1499 break; 1500 case HCI_POWER_SLEEP: 1501 // do nothing (with SLEEP == OFF) 1502 break; 1503 } 1504 break; 1505 1506 case HCI_STATE_INITIALIZING: 1507 switch (power_mode){ 1508 case HCI_POWER_ON: 1509 // do nothing 1510 break; 1511 case HCI_POWER_OFF: 1512 // no connections yet, just turn it off 1513 hci_power_control_off(); 1514 break; 1515 case HCI_POWER_SLEEP: 1516 // no connections yet, just turn it off 1517 hci_power_control_sleep(); 1518 break; 1519 } 1520 break; 1521 1522 case HCI_STATE_WORKING: 1523 switch (power_mode){ 1524 case HCI_POWER_ON: 1525 // do nothing 1526 break; 1527 case HCI_POWER_OFF: 1528 // see hci_run 1529 hci_stack->state = HCI_STATE_HALTING; 1530 break; 1531 case HCI_POWER_SLEEP: 1532 // see hci_run 1533 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1534 hci_stack->substate = 0; 1535 break; 1536 } 1537 break; 1538 1539 case HCI_STATE_HALTING: 1540 switch (power_mode){ 1541 case HCI_POWER_ON: 1542 hci_power_transition_to_initializing(); 1543 break; 1544 case HCI_POWER_OFF: 1545 // do nothing 1546 break; 1547 case HCI_POWER_SLEEP: 1548 // see hci_run 1549 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1550 hci_stack->substate = 0; 1551 break; 1552 } 1553 break; 1554 1555 case HCI_STATE_FALLING_ASLEEP: 1556 switch (power_mode){ 1557 case HCI_POWER_ON: 1558 1559 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1560 // nothing to do, if H4 supports power management 1561 if (bt_control_iphone_power_management_enabled()){ 1562 hci_stack->state = HCI_STATE_INITIALIZING; 1563 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1564 break; 1565 } 1566 #endif 1567 hci_power_transition_to_initializing(); 1568 break; 1569 case HCI_POWER_OFF: 1570 // see hci_run 1571 hci_stack->state = HCI_STATE_HALTING; 1572 break; 1573 case HCI_POWER_SLEEP: 1574 // do nothing 1575 break; 1576 } 1577 break; 1578 1579 case HCI_STATE_SLEEPING: 1580 switch (power_mode){ 1581 case HCI_POWER_ON: 1582 1583 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1584 // nothing to do, if H4 supports power management 1585 if (bt_control_iphone_power_management_enabled()){ 1586 hci_stack->state = HCI_STATE_INITIALIZING; 1587 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1588 hci_update_scan_enable(); 1589 break; 1590 } 1591 #endif 1592 err = hci_power_control_wake(); 1593 if (err) return err; 1594 hci_power_transition_to_initializing(); 1595 break; 1596 case HCI_POWER_OFF: 1597 hci_stack->state = HCI_STATE_HALTING; 1598 break; 1599 case HCI_POWER_SLEEP: 1600 // do nothing 1601 break; 1602 } 1603 break; 1604 } 1605 1606 // create internal event 1607 hci_emit_state(); 1608 1609 // trigger next/first action 1610 hci_run(); 1611 1612 return 0; 1613 } 1614 1615 static void hci_update_scan_enable(void){ 1616 // 2 = page scan, 1 = inq scan 1617 hci_stack->new_scan_enable_value = hci_stack->connectable << 1 | hci_stack->discoverable; 1618 hci_run(); 1619 } 1620 1621 void hci_discoverable_control(uint8_t enable){ 1622 if (enable) enable = 1; // normalize argument 1623 1624 if (hci_stack->discoverable == enable){ 1625 hci_emit_discoverable_enabled(hci_stack->discoverable); 1626 return; 1627 } 1628 1629 hci_stack->discoverable = enable; 1630 hci_update_scan_enable(); 1631 } 1632 1633 void hci_connectable_control(uint8_t enable){ 1634 if (enable) enable = 1; // normalize argument 1635 1636 // don't emit event 1637 if (hci_stack->connectable == enable) return; 1638 1639 hci_stack->connectable = enable; 1640 hci_update_scan_enable(); 1641 } 1642 1643 bd_addr_t * hci_local_bd_addr(void){ 1644 return &hci_stack->local_bd_addr; 1645 } 1646 1647 void hci_run(){ 1648 1649 hci_connection_t * connection; 1650 linked_item_t * it; 1651 1652 if (!hci_can_send_command_packet_now()) return; 1653 1654 // global/non-connection oriented commands 1655 1656 // decline incoming connections 1657 if (hci_stack->decline_reason){ 1658 uint8_t reason = hci_stack->decline_reason; 1659 hci_stack->decline_reason = 0; 1660 hci_send_cmd(&hci_reject_connection_request, hci_stack->decline_addr, reason); 1661 return; 1662 } 1663 1664 // send scan enable 1665 if (hci_stack->state == HCI_STATE_WORKING && hci_stack->new_scan_enable_value != 0xff && hci_classic_supported()){ 1666 hci_send_cmd(&hci_write_scan_enable, hci_stack->new_scan_enable_value); 1667 hci_stack->new_scan_enable_value = 0xff; 1668 return; 1669 } 1670 1671 #ifdef HAVE_BLE 1672 // handle le scan 1673 if (hci_stack->state == HCI_STATE_WORKING){ 1674 switch(hci_stack->le_scanning_state){ 1675 case LE_START_SCAN: 1676 hci_stack->le_scanning_state = LE_SCANNING; 1677 hci_send_cmd(&hci_le_set_scan_enable, 1, 0); 1678 return; 1679 1680 case LE_STOP_SCAN: 1681 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1682 hci_send_cmd(&hci_le_set_scan_enable, 0, 0); 1683 return; 1684 default: 1685 break; 1686 } 1687 if (hci_stack->le_scan_type != 0xff){ 1688 // defaults: active scanning, accept all advertisement packets 1689 int scan_type = hci_stack->le_scan_type; 1690 hci_stack->le_scan_type = 0xff; 1691 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); 1692 return; 1693 } 1694 } 1695 #endif 1696 1697 // send pending HCI commands 1698 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 1699 connection = (hci_connection_t *) it; 1700 1701 switch(connection->state){ 1702 case SEND_CREATE_CONNECTION: 1703 switch(connection->address_type){ 1704 case BD_ADDR_TYPE_CLASSIC: 1705 log_info("sending hci_create_connection"); 1706 hci_send_cmd(&hci_create_connection, connection->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 1707 break; 1708 default: 1709 #ifdef HAVE_BLE 1710 log_info("sending hci_le_create_connection"); 1711 hci_send_cmd(&hci_le_create_connection, 1712 0x0060, // scan interval: 60 ms 1713 0x0030, // scan interval: 30 ms 1714 0, // don't use whitelist 1715 connection->address_type, // peer address type 1716 connection->address, // peer bd addr 1717 hci_stack->adv_addr_type, // our addr type: 1718 0x0008, // conn interval min 1719 0x0018, // conn interval max 1720 0, // conn latency 1721 0x0048, // supervision timeout 1722 0x0001, // min ce length 1723 0x0001 // max ce length 1724 ); 1725 1726 connection->state = SENT_CREATE_CONNECTION; 1727 #endif 1728 break; 1729 } 1730 return; 1731 1732 case RECEIVED_CONNECTION_REQUEST: 1733 log_info("sending hci_accept_connection_request"); 1734 connection->state = ACCEPTED_CONNECTION_REQUEST; 1735 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 1736 return; 1737 1738 #ifdef HAVE_BLE 1739 case SEND_CANCEL_CONNECTION: 1740 connection->state = SENT_CANCEL_CONNECTION; 1741 hci_send_cmd(&hci_le_create_connection_cancel); 1742 return; 1743 #endif 1744 case SEND_DISCONNECT: 1745 connection->state = SENT_DISCONNECT; 1746 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1747 return; 1748 1749 default: 1750 break; 1751 } 1752 1753 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 1754 log_info("responding to link key request"); 1755 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 1756 link_key_t link_key; 1757 link_key_type_t link_key_type; 1758 if ( hci_stack->remote_device_db 1759 && hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type) 1760 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 1761 connection->link_key_type = link_key_type; 1762 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 1763 } else { 1764 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 1765 } 1766 return; 1767 } 1768 1769 if (connection->authentication_flags & DENY_PIN_CODE_REQUEST){ 1770 log_info("denying to pin request"); 1771 connectionClearAuthenticationFlags(connection, DENY_PIN_CODE_REQUEST); 1772 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 1773 return; 1774 } 1775 1776 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 1777 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 1778 log_info("IO Capability Request received, stack bondable %u, io cap %u", hci_stack->bondable, hci_stack->ssp_io_capability); 1779 if (hci_stack->bondable && (hci_stack->ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN)){ 1780 // tweak authentication requirements 1781 uint8_t authreq = hci_stack->ssp_authentication_requirement; 1782 if (connection->bonding_flags & BONDING_DEDICATED){ 1783 authreq = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING; 1784 } 1785 if (gap_mitm_protection_required_for_security_level(connection->requested_security_level)){ 1786 authreq |= 1; 1787 } 1788 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack->ssp_io_capability, NULL, authreq); 1789 } else { 1790 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 1791 } 1792 return; 1793 } 1794 1795 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 1796 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 1797 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 1798 return; 1799 } 1800 1801 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 1802 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 1803 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 1804 return; 1805 } 1806 1807 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 1808 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 1809 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 1810 return; 1811 } 1812 1813 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 1814 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 1815 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 1816 return; 1817 } 1818 if (connection->bonding_flags & BONDING_DISCONNECT_DEDICATED_DONE){ 1819 connection->bonding_flags &= ~BONDING_DISCONNECT_DEDICATED_DONE; 1820 connection->bonding_flags |= BONDING_EMIT_COMPLETE_ON_DISCONNECT; 1821 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // authentication done 1822 return; 1823 } 1824 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 1825 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 1826 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 1827 return; 1828 } 1829 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 1830 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 1831 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 1832 return; 1833 } 1834 } 1835 1836 switch (hci_stack->state){ 1837 case HCI_STATE_INITIALIZING: 1838 hci_initializing_state_machine(); 1839 break; 1840 1841 case HCI_STATE_HALTING: 1842 1843 log_info("HCI_STATE_HALTING"); 1844 // close all open connections 1845 connection = (hci_connection_t *) hci_stack->connections; 1846 if (connection){ 1847 1848 // send disconnect 1849 if (!hci_can_send_command_packet_now()) return; 1850 1851 log_info("HCI_STATE_HALTING, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 1852 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1853 1854 // send disconnected event right away - causes higher layer connections to get closed, too. 1855 hci_shutdown_connection(connection); 1856 return; 1857 } 1858 log_info("HCI_STATE_HALTING, calling off"); 1859 1860 // switch mode 1861 hci_power_control_off(); 1862 1863 log_info("HCI_STATE_HALTING, emitting state"); 1864 hci_emit_state(); 1865 log_info("HCI_STATE_HALTING, done"); 1866 break; 1867 1868 case HCI_STATE_FALLING_ASLEEP: 1869 switch(hci_stack->substate) { 1870 case 0: 1871 log_info("HCI_STATE_FALLING_ASLEEP"); 1872 // close all open connections 1873 connection = (hci_connection_t *) hci_stack->connections; 1874 1875 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1876 // don't close connections, if H4 supports power management 1877 if (bt_control_iphone_power_management_enabled()){ 1878 connection = NULL; 1879 } 1880 #endif 1881 if (connection){ 1882 1883 // send disconnect 1884 if (!hci_can_send_command_packet_now()) return; 1885 1886 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 1887 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1888 1889 // send disconnected event right away - causes higher layer connections to get closed, too. 1890 hci_shutdown_connection(connection); 1891 return; 1892 } 1893 1894 if (hci_classic_supported()){ 1895 // disable page and inquiry scan 1896 if (!hci_can_send_command_packet_now()) return; 1897 1898 log_info("HCI_STATE_HALTING, disabling inq scans"); 1899 hci_send_cmd(&hci_write_scan_enable, hci_stack->connectable << 1); // drop inquiry scan but keep page scan 1900 1901 // continue in next sub state 1902 hci_stack->substate++; 1903 break; 1904 } 1905 // fall through for ble-only chips 1906 1907 case 2: 1908 log_info("HCI_STATE_HALTING, calling sleep"); 1909 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1910 // don't actually go to sleep, if H4 supports power management 1911 if (bt_control_iphone_power_management_enabled()){ 1912 // SLEEP MODE reached 1913 hci_stack->state = HCI_STATE_SLEEPING; 1914 hci_emit_state(); 1915 break; 1916 } 1917 #endif 1918 // switch mode 1919 hci_power_control_sleep(); // changes hci_stack->state to SLEEP 1920 hci_emit_state(); 1921 break; 1922 1923 default: 1924 break; 1925 } 1926 break; 1927 1928 default: 1929 break; 1930 } 1931 } 1932 1933 int hci_send_cmd_packet(uint8_t *packet, int size){ 1934 bd_addr_t addr; 1935 hci_connection_t * conn; 1936 // house-keeping 1937 1938 // create_connection? 1939 if (IS_COMMAND(packet, hci_create_connection)){ 1940 bt_flip_addr(addr, &packet[3]); 1941 log_info("Create_connection to %s", bd_addr_to_str(addr)); 1942 1943 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1944 if (!conn){ 1945 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 1946 if (!conn){ 1947 // notify client that alloc failed 1948 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 1949 return 0; // don't sent packet to controller 1950 } 1951 conn->state = SEND_CREATE_CONNECTION; 1952 } 1953 log_info("conn state %u", conn->state); 1954 switch (conn->state){ 1955 // if connection active exists 1956 case OPEN: 1957 // and OPEN, emit connection complete command, don't send to controller 1958 hci_emit_connection_complete(conn, 0); 1959 return 0; 1960 case SEND_CREATE_CONNECTION: 1961 // connection created by hci, e.g. dedicated bonding 1962 break; 1963 default: 1964 // otherwise, just ignore as it is already in the open process 1965 return 0; 1966 } 1967 conn->state = SENT_CREATE_CONNECTION; 1968 } 1969 1970 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 1971 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 1972 } 1973 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 1974 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 1975 } 1976 1977 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 1978 if (hci_stack->remote_device_db){ 1979 bt_flip_addr(addr, &packet[3]); 1980 hci_stack->remote_device_db->delete_link_key(&addr); 1981 } 1982 } 1983 1984 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply) 1985 || IS_COMMAND(packet, hci_pin_code_request_reply)){ 1986 bt_flip_addr(addr, &packet[3]); 1987 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1988 if (conn){ 1989 connectionClearAuthenticationFlags(conn, LEGACY_PAIRING_ACTIVE); 1990 } 1991 } 1992 1993 if (IS_COMMAND(packet, hci_user_confirmation_request_negative_reply) 1994 || IS_COMMAND(packet, hci_user_confirmation_request_reply) 1995 || IS_COMMAND(packet, hci_user_passkey_request_negative_reply) 1996 || IS_COMMAND(packet, hci_user_passkey_request_reply)) { 1997 bt_flip_addr(addr, &packet[3]); 1998 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1999 if (conn){ 2000 connectionClearAuthenticationFlags(conn, SSP_PAIRING_ACTIVE); 2001 } 2002 } 2003 2004 #ifdef HAVE_BLE 2005 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 2006 hci_stack->adv_addr_type = packet[8]; 2007 } 2008 if (IS_COMMAND(packet, hci_le_set_random_address)){ 2009 bt_flip_addr(hci_stack->adv_address, &packet[3]); 2010 } 2011 #endif 2012 2013 hci_stack->num_cmd_packets--; 2014 int err = hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 2015 2016 // free packet buffer for synchronous transport implementations 2017 if (hci_transport_synchronous() && (packet == hci_stack->hci_packet_buffer)){ 2018 hci_stack->hci_packet_buffer_reserved = 0; 2019 } 2020 2021 return err; 2022 } 2023 2024 // disconnect because of security block 2025 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 2026 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2027 if (!connection) return; 2028 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 2029 } 2030 2031 2032 // Configure Secure Simple Pairing 2033 2034 // enable will enable SSP during init 2035 void hci_ssp_set_enable(int enable){ 2036 hci_stack->ssp_enable = enable; 2037 } 2038 2039 int hci_local_ssp_activated(){ 2040 return hci_ssp_supported() && hci_stack->ssp_enable; 2041 } 2042 2043 // if set, BTstack will respond to io capability request using authentication requirement 2044 void hci_ssp_set_io_capability(int io_capability){ 2045 hci_stack->ssp_io_capability = io_capability; 2046 } 2047 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 2048 hci_stack->ssp_authentication_requirement = authentication_requirement; 2049 } 2050 2051 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 2052 void hci_ssp_set_auto_accept(int auto_accept){ 2053 hci_stack->ssp_auto_accept = auto_accept; 2054 } 2055 2056 /** 2057 * pre: numcmds >= 0 - it's allowed to send a command to the controller 2058 */ 2059 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 2060 2061 if (!hci_can_send_command_packet_now()){ 2062 log_error("hci_send_cmd called but cannot send packet now"); 2063 return 0; 2064 } 2065 2066 // for HCI INITIALIZATION 2067 // log_info("hci_send_cmd: opcode %04x", cmd->opcode); 2068 hci_stack->last_cmd_opcode = cmd->opcode; 2069 2070 hci_reserve_packet_buffer(); 2071 uint8_t * packet = hci_stack->hci_packet_buffer; 2072 2073 va_list argptr; 2074 va_start(argptr, cmd); 2075 uint16_t size = hci_create_cmd_internal(packet, cmd, argptr); 2076 va_end(argptr); 2077 2078 return hci_send_cmd_packet(packet, size); 2079 } 2080 2081 // Create various non-HCI events. 2082 // TODO: generalize, use table similar to hci_create_command 2083 2084 void hci_emit_state(){ 2085 log_info("BTSTACK_EVENT_STATE %u", hci_stack->state); 2086 uint8_t event[3]; 2087 event[0] = BTSTACK_EVENT_STATE; 2088 event[1] = sizeof(event) - 2; 2089 event[2] = hci_stack->state; 2090 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2091 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2092 } 2093 2094 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 2095 uint8_t event[13]; 2096 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 2097 event[1] = sizeof(event) - 2; 2098 event[2] = status; 2099 bt_store_16(event, 3, conn->con_handle); 2100 bt_flip_addr(&event[5], conn->address); 2101 event[11] = 1; // ACL connection 2102 event[12] = 0; // encryption disabled 2103 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2104 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2105 } 2106 2107 void hci_emit_le_connection_complete(hci_connection_t *conn, uint8_t status){ 2108 uint8_t event[21]; 2109 event[0] = HCI_EVENT_LE_META; 2110 event[1] = sizeof(event) - 2; 2111 event[2] = HCI_SUBEVENT_LE_CONNECTION_COMPLETE; 2112 event[3] = status; 2113 bt_store_16(event, 4, conn->con_handle); 2114 event[6] = 0; // TODO: role 2115 event[7] = conn->address_type; 2116 bt_flip_addr(&event[8], conn->address); 2117 bt_store_16(event, 14, 0); // interval 2118 bt_store_16(event, 16, 0); // latency 2119 bt_store_16(event, 18, 0); // supervision timeout 2120 event[20] = 0; // master clock accuracy 2121 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2122 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2123 } 2124 2125 void hci_emit_disconnection_complete(uint16_t handle, uint8_t reason){ 2126 uint8_t event[6]; 2127 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 2128 event[1] = sizeof(event) - 2; 2129 event[2] = 0; // status = OK 2130 bt_store_16(event, 3, handle); 2131 event[5] = reason; 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_l2cap_check_timeout(hci_connection_t *conn){ 2137 if (disable_l2cap_timeouts) return; 2138 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 2139 uint8_t event[4]; 2140 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 2141 event[1] = sizeof(event) - 2; 2142 bt_store_16(event, 2, conn->con_handle); 2143 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2144 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2145 } 2146 2147 void hci_emit_nr_connections_changed(){ 2148 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 2149 uint8_t event[3]; 2150 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 2151 event[1] = sizeof(event) - 2; 2152 event[2] = nr_hci_connections(); 2153 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2154 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2155 } 2156 2157 void hci_emit_hci_open_failed(){ 2158 log_info("BTSTACK_EVENT_POWERON_FAILED"); 2159 uint8_t event[2]; 2160 event[0] = BTSTACK_EVENT_POWERON_FAILED; 2161 event[1] = sizeof(event) - 2; 2162 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2163 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2164 } 2165 2166 #ifndef EMBEDDED 2167 void hci_emit_btstack_version() { 2168 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 2169 uint8_t event[6]; 2170 event[0] = BTSTACK_EVENT_VERSION; 2171 event[1] = sizeof(event) - 2; 2172 event[2] = BTSTACK_MAJOR; 2173 event[3] = BTSTACK_MINOR; 2174 bt_store_16(event, 4, BTSTACK_REVISION); 2175 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2176 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2177 } 2178 #endif 2179 2180 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 2181 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 2182 uint8_t event[3]; 2183 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 2184 event[1] = sizeof(event) - 2; 2185 event[2] = enabled; 2186 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2187 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2188 } 2189 2190 void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){ 2191 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 2192 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 2193 event[1] = sizeof(event) - 2 - 1; 2194 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 2195 bt_flip_addr(&event[3], *addr); 2196 memcpy(&event[9], name, 248); 2197 2198 event[9+248] = 0; // assert \0 for log_info 2199 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(*addr), &event[9]); 2200 2201 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 2202 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 2203 } 2204 2205 void hci_emit_discoverable_enabled(uint8_t enabled){ 2206 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 2207 uint8_t event[3]; 2208 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 2209 event[1] = sizeof(event) - 2; 2210 event[2] = enabled; 2211 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2212 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2213 } 2214 2215 void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){ 2216 log_info("hci_emit_security_level %u for handle %x", level, con_handle); 2217 uint8_t event[5]; 2218 int pos = 0; 2219 event[pos++] = GAP_SECURITY_LEVEL; 2220 event[pos++] = sizeof(event) - 2; 2221 bt_store_16(event, 2, con_handle); 2222 pos += 2; 2223 event[pos++] = level; 2224 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2225 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2226 } 2227 2228 void hci_emit_dedicated_bonding_result(bd_addr_t address, uint8_t status){ 2229 log_info("hci_emit_dedicated_bonding_result %u ", status); 2230 uint8_t event[9]; 2231 int pos = 0; 2232 event[pos++] = GAP_DEDICATED_BONDING_COMPLETED; 2233 event[pos++] = sizeof(event) - 2; 2234 event[pos++] = status; 2235 bt_flip_addr( * (bd_addr_t *) &event[pos], address); 2236 pos += 6; 2237 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2238 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2239 } 2240 2241 // query if remote side supports SSP 2242 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 2243 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2244 if (!connection) return 0; 2245 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 2246 } 2247 2248 int hci_ssp_supported_on_both_sides(hci_con_handle_t handle){ 2249 return hci_local_ssp_activated() && hci_remote_ssp_supported(handle); 2250 } 2251 2252 // GAP API 2253 /** 2254 * @bbrief enable/disable bonding. default is enabled 2255 * @praram enabled 2256 */ 2257 void gap_set_bondable_mode(int enable){ 2258 hci_stack->bondable = enable ? 1 : 0; 2259 } 2260 2261 /** 2262 * @brief map link keys to security levels 2263 */ 2264 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 2265 switch (link_key_type){ 2266 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 2267 return LEVEL_4; 2268 case COMBINATION_KEY: 2269 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 2270 return LEVEL_3; 2271 default: 2272 return LEVEL_2; 2273 } 2274 } 2275 2276 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 2277 if (!connection) return LEVEL_0; 2278 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 2279 return gap_security_level_for_link_key_type(connection->link_key_type); 2280 } 2281 2282 2283 int gap_mitm_protection_required_for_security_level(gap_security_level_t level){ 2284 log_info("gap_mitm_protection_required_for_security_level %u", level); 2285 return level > LEVEL_2; 2286 } 2287 2288 /** 2289 * @brief get current security level 2290 */ 2291 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 2292 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2293 if (!connection) return LEVEL_0; 2294 return gap_security_level_for_connection(connection); 2295 } 2296 2297 /** 2298 * @brief request connection to device to 2299 * @result GAP_AUTHENTICATION_RESULT 2300 */ 2301 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 2302 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2303 if (!connection){ 2304 hci_emit_security_level(con_handle, LEVEL_0); 2305 return; 2306 } 2307 gap_security_level_t current_level = gap_security_level(con_handle); 2308 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 2309 if (current_level >= requested_level){ 2310 hci_emit_security_level(con_handle, current_level); 2311 return; 2312 } 2313 2314 connection->requested_security_level = requested_level; 2315 2316 // would enabling ecnryption suffice (>= LEVEL_2)? 2317 if (hci_stack->remote_device_db){ 2318 link_key_type_t link_key_type; 2319 link_key_t link_key; 2320 if (hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type)){ 2321 if (gap_security_level_for_link_key_type(link_key_type) >= requested_level){ 2322 connection->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 2323 return; 2324 } 2325 } 2326 } 2327 2328 // try to authenticate connection 2329 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 2330 hci_run(); 2331 } 2332 2333 /** 2334 * @brief start dedicated bonding with device. disconnect after bonding 2335 * @param device 2336 * @param request MITM protection 2337 * @result GAP_DEDICATED_BONDING_COMPLETE 2338 */ 2339 int gap_dedicated_bonding(bd_addr_t device, int mitm_protection_required){ 2340 2341 // create connection state machine 2342 hci_connection_t * connection = create_connection_for_bd_addr_and_type(device, BD_ADDR_TYPE_CLASSIC); 2343 2344 if (!connection){ 2345 return BTSTACK_MEMORY_ALLOC_FAILED; 2346 } 2347 2348 // delete linkn key 2349 hci_drop_link_key_for_bd_addr( (bd_addr_t *) &device); 2350 2351 // configure LEVEL_2/3, dedicated bonding 2352 connection->state = SEND_CREATE_CONNECTION; 2353 connection->requested_security_level = mitm_protection_required ? LEVEL_3 : LEVEL_2; 2354 log_info("gap_dedicated_bonding, mitm %u -> level %u", mitm_protection_required, connection->requested_security_level); 2355 connection->bonding_flags = BONDING_DEDICATED; 2356 2357 // wait for GAP Security Result and send GAP Dedicated Bonding complete 2358 2359 // handle: connnection failure (connection complete != ok) 2360 // handle: authentication failure 2361 // handle: disconnect on done 2362 2363 hci_run(); 2364 2365 return 0; 2366 } 2367 2368 void gap_set_local_name(const char * local_name){ 2369 hci_stack->local_name = local_name; 2370 } 2371 2372 le_command_status_t le_central_start_scan(){ 2373 if (hci_stack->le_scanning_state == LE_SCANNING) return BLE_PERIPHERAL_OK; 2374 hci_stack->le_scanning_state = LE_START_SCAN; 2375 hci_run(); 2376 return BLE_PERIPHERAL_OK; 2377 } 2378 2379 le_command_status_t le_central_stop_scan(){ 2380 if ( hci_stack->le_scanning_state == LE_SCAN_IDLE) return BLE_PERIPHERAL_OK; 2381 hci_stack->le_scanning_state = LE_STOP_SCAN; 2382 hci_run(); 2383 return BLE_PERIPHERAL_OK; 2384 } 2385 2386 void le_central_set_scan_parameters(uint8_t scan_type, uint16_t scan_interval, uint16_t scan_window){ 2387 hci_stack->le_scan_type = scan_type; 2388 hci_stack->le_scan_interval = scan_interval; 2389 hci_stack->le_scan_window = scan_window; 2390 hci_run(); 2391 } 2392 2393 le_command_status_t le_central_connect(bd_addr_t * addr, bd_addr_type_t addr_type){ 2394 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 2395 if (!conn){ 2396 log_info("le_central_connect: no connection exists yet, creating context"); 2397 conn = create_connection_for_bd_addr_and_type(*addr, addr_type); 2398 if (!conn){ 2399 // notify client that alloc failed 2400 hci_emit_le_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 2401 log_info("le_central_connect: failed to alloc context"); 2402 return BLE_PERIPHERAL_NOT_CONNECTED; // don't sent packet to controller 2403 } 2404 conn->state = SEND_CREATE_CONNECTION; 2405 log_info("le_central_connect: send create connection next"); 2406 hci_run(); 2407 return BLE_PERIPHERAL_OK; 2408 } 2409 2410 if (!hci_is_le_connection(conn) || 2411 conn->state == SEND_CREATE_CONNECTION || 2412 conn->state == SENT_CREATE_CONNECTION) { 2413 hci_emit_le_connection_complete(conn, ERROR_CODE_COMMAND_DISALLOWED); 2414 log_error("le_central_connect: classic connection or connect is already being created"); 2415 return BLE_PERIPHERAL_IN_WRONG_STATE; 2416 } 2417 2418 log_info("le_central_connect: context exists with state %u", conn->state); 2419 hci_emit_le_connection_complete(conn, 0); 2420 hci_run(); 2421 return BLE_PERIPHERAL_OK; 2422 } 2423 2424 // @assumption: only a single outgoing LE Connection exists 2425 static hci_connection_t * le_central_get_outgoing_connection(){ 2426 linked_item_t *it; 2427 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 2428 hci_connection_t * conn = (hci_connection_t *) it; 2429 if (!hci_is_le_connection(conn)) continue; 2430 switch (conn->state){ 2431 case SEND_CREATE_CONNECTION: 2432 case SENT_CREATE_CONNECTION: 2433 return conn; 2434 default: 2435 break; 2436 }; 2437 } 2438 return NULL; 2439 } 2440 2441 le_command_status_t le_central_connect_cancel(){ 2442 hci_connection_t * conn = le_central_get_outgoing_connection(); 2443 switch (conn->state){ 2444 case SEND_CREATE_CONNECTION: 2445 // skip sending create connection and emit event instead 2446 hci_emit_le_connection_complete(conn, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 2447 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 2448 btstack_memory_hci_connection_free( conn ); 2449 break; 2450 case SENT_CREATE_CONNECTION: 2451 // request to send cancel connection 2452 conn->state = SEND_CANCEL_CONNECTION; 2453 hci_run(); 2454 break; 2455 default: 2456 break; 2457 } 2458 return BLE_PERIPHERAL_OK; 2459 } 2460 2461 le_command_status_t gap_disconnect(hci_con_handle_t handle){ 2462 hci_connection_t * conn = hci_connection_for_handle(handle); 2463 if (!conn){ 2464 hci_emit_disconnection_complete(handle, 0); 2465 return BLE_PERIPHERAL_OK; 2466 } 2467 conn->state = SEND_DISCONNECT; 2468 hci_run(); 2469 return BLE_PERIPHERAL_OK; 2470 } 2471 2472 void hci_disconnect_all(){ 2473 linked_list_iterator_t it; 2474 linked_list_iterator_init(&it, &hci_stack->connections); 2475 while (linked_list_iterator_has_next(&it)){ 2476 hci_connection_t * con = (hci_connection_t*) linked_list_iterator_next(&it); 2477 if (con->state == SENT_DISCONNECT) continue; 2478 con->state = SEND_DISCONNECT; 2479 } 2480 hci_run(); 2481 } 2482