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 #ifdef _WIN32 55 #include "Winsock2.h" 56 #else 57 #include <unistd.h> // gethostbyname 58 #endif 59 #include <btstack/version.h> 60 #endif 61 62 #include "btstack_memory.h" 63 #include "debug.h" 64 #include "hci_dump.h" 65 66 #include <btstack/linked_list.h> 67 #include <btstack/hci_cmds.h> 68 69 #define HCI_CONNECTION_TIMEOUT_MS 10000 70 71 #define HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP 11 72 73 #ifdef USE_BLUETOOL 74 #include "../platforms/ios/src/bt_control_iphone.h" 75 #endif 76 77 static void hci_update_scan_enable(void); 78 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection); 79 static void hci_connection_timeout_handler(timer_source_t *timer); 80 static void hci_connection_timestamp(hci_connection_t *connection); 81 static int hci_power_control_on(void); 82 static void hci_power_control_off(void); 83 static void hci_state_reset(); 84 85 // the STACK is here 86 #ifndef HAVE_MALLOC 87 static hci_stack_t hci_stack_static; 88 #endif 89 static hci_stack_t * hci_stack = NULL; 90 91 // test helper 92 static uint8_t disable_l2cap_timeouts = 0; 93 94 /** 95 * create connection for given address 96 * 97 * @return connection OR NULL, if no memory left 98 */ 99 static hci_connection_t * create_connection_for_bd_addr_and_type(bd_addr_t addr, bd_addr_type_t addr_type){ 100 101 log_info("create_connection_for_addr %s", bd_addr_to_str(addr)); 102 hci_connection_t * conn = btstack_memory_hci_connection_get(); 103 if (!conn) return NULL; 104 BD_ADDR_COPY(conn->address, addr); 105 conn->address_type = addr_type; 106 conn->con_handle = 0xffff; 107 conn->authentication_flags = AUTH_FLAGS_NONE; 108 conn->bonding_flags = 0; 109 conn->requested_security_level = LEVEL_0; 110 linked_item_set_user(&conn->timeout.item, conn); 111 conn->timeout.process = hci_connection_timeout_handler; 112 hci_connection_timestamp(conn); 113 conn->acl_recombination_length = 0; 114 conn->acl_recombination_pos = 0; 115 conn->num_acl_packets_sent = 0; 116 conn->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 117 linked_list_add(&hci_stack->connections, (linked_item_t *) conn); 118 return conn; 119 } 120 121 122 /** 123 * get le connection parameter range 124 * 125 * @return le connection parameter range struct 126 */ 127 le_connection_parameter_range_t gap_le_get_connection_parameter_range(){ 128 return hci_stack->le_connection_parameter_range; 129 } 130 131 /** 132 * set le connection parameter range 133 * 134 */ 135 136 void gap_le_set_connection_parameter_range(le_connection_parameter_range_t range){ 137 hci_stack->le_connection_parameter_range.le_conn_interval_min = range.le_conn_interval_min; 138 hci_stack->le_connection_parameter_range.le_conn_interval_max = range.le_conn_interval_max; 139 hci_stack->le_connection_parameter_range.le_conn_interval_min = range.le_conn_latency_min; 140 hci_stack->le_connection_parameter_range.le_conn_interval_max = range.le_conn_latency_max; 141 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = range.le_supervision_timeout_min; 142 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = range.le_supervision_timeout_max; 143 } 144 145 /** 146 * get hci connections iterator 147 * 148 * @return hci connections iterator 149 */ 150 151 void hci_connections_get_iterator(linked_list_iterator_t *it){ 152 linked_list_iterator_init(it, &hci_stack->connections); 153 } 154 155 /** 156 * get connection for a given handle 157 * 158 * @return connection OR NULL, if not found 159 */ 160 hci_connection_t * hci_connection_for_handle(hci_con_handle_t con_handle){ 161 linked_list_iterator_t it; 162 linked_list_iterator_init(&it, &hci_stack->connections); 163 while (linked_list_iterator_has_next(&it)){ 164 hci_connection_t * item = (hci_connection_t *) linked_list_iterator_next(&it); 165 if ( item->con_handle == con_handle ) { 166 return item; 167 } 168 } 169 return NULL; 170 } 171 172 /** 173 * get connection for given address 174 * 175 * @return connection OR NULL, if not found 176 */ 177 hci_connection_t * hci_connection_for_bd_addr_and_type(bd_addr_t * addr, bd_addr_type_t addr_type){ 178 linked_list_iterator_t it; 179 linked_list_iterator_init(&it, &hci_stack->connections); 180 while (linked_list_iterator_has_next(&it)){ 181 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 182 if (connection->address_type != addr_type) continue; 183 if (memcmp(addr, connection->address, 6) != 0) continue; 184 return connection; 185 } 186 return NULL; 187 } 188 189 static void hci_connection_timeout_handler(timer_source_t *timer){ 190 hci_connection_t * connection = (hci_connection_t *) linked_item_get_user(&timer->item); 191 #ifdef HAVE_TIME 192 struct timeval tv; 193 gettimeofday(&tv, NULL); 194 if (tv.tv_sec >= connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000) { 195 // connections might be timed out 196 hci_emit_l2cap_check_timeout(connection); 197 } 198 #endif 199 #ifdef HAVE_TICK 200 if (embedded_get_ticks() > connection->timestamp + embedded_ticks_for_ms(HCI_CONNECTION_TIMEOUT_MS)){ 201 // connections might be timed out 202 hci_emit_l2cap_check_timeout(connection); 203 } 204 #endif 205 run_loop_set_timer(timer, HCI_CONNECTION_TIMEOUT_MS); 206 run_loop_add_timer(timer); 207 } 208 209 static void hci_connection_timestamp(hci_connection_t *connection){ 210 #ifdef HAVE_TIME 211 gettimeofday(&connection->timestamp, NULL); 212 #endif 213 #ifdef HAVE_TICK 214 connection->timestamp = embedded_get_ticks(); 215 #endif 216 } 217 218 219 inline static void connectionSetAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 220 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags | flags); 221 } 222 223 inline static void connectionClearAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 224 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags & ~flags); 225 } 226 227 228 /** 229 * add authentication flags and reset timer 230 * @note: assumes classic connection 231 */ 232 static void hci_add_connection_flags_for_flipped_bd_addr(uint8_t *bd_addr, hci_authentication_flags_t flags){ 233 bd_addr_t addr; 234 bt_flip_addr(addr, *(bd_addr_t *) bd_addr); 235 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 236 if (conn) { 237 connectionSetAuthenticationFlags(conn, flags); 238 hci_connection_timestamp(conn); 239 } 240 } 241 242 int hci_authentication_active_for_handle(hci_con_handle_t handle){ 243 hci_connection_t * conn = hci_connection_for_handle(handle); 244 if (!conn) return 0; 245 if (conn->authentication_flags & LEGACY_PAIRING_ACTIVE) return 1; 246 if (conn->authentication_flags & SSP_PAIRING_ACTIVE) return 1; 247 return 0; 248 } 249 250 void hci_drop_link_key_for_bd_addr(bd_addr_t *addr){ 251 if (hci_stack->remote_device_db) { 252 hci_stack->remote_device_db->delete_link_key(addr); 253 } 254 } 255 256 int hci_is_le_connection(hci_connection_t * connection){ 257 return connection->address_type == BD_ADDR_TYPE_LE_PUBLIC || 258 connection->address_type == BD_ADDR_TYPE_LE_RANDOM; 259 } 260 261 262 /** 263 * count connections 264 */ 265 static int nr_hci_connections(void){ 266 int count = 0; 267 linked_item_t *it; 268 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next, count++); 269 return count; 270 } 271 272 /** 273 * Dummy handler called by HCI 274 */ 275 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 276 } 277 278 uint8_t hci_number_outgoing_packets(hci_con_handle_t handle){ 279 hci_connection_t * connection = hci_connection_for_handle(handle); 280 if (!connection) { 281 log_error("hci_number_outgoing_packets: connection for handle %u does not exist!", handle); 282 return 0; 283 } 284 return connection->num_acl_packets_sent; 285 } 286 287 uint8_t hci_number_free_acl_slots_for_handle(hci_con_handle_t con_handle){ 288 289 int num_packets_sent_classic = 0; 290 int num_packets_sent_le = 0; 291 292 bd_addr_type_t address_type = BD_ADDR_TYPE_UNKNOWN; 293 294 linked_item_t *it; 295 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 296 hci_connection_t * connection = (hci_connection_t *) it; 297 if (connection->address_type == BD_ADDR_TYPE_CLASSIC){ 298 num_packets_sent_classic += connection->num_acl_packets_sent; 299 } else { 300 num_packets_sent_le += connection->num_acl_packets_sent; 301 } 302 if (connection->con_handle == con_handle){ 303 address_type = connection->address_type; 304 } 305 } 306 307 int free_slots_classic = hci_stack->acl_packets_total_num - num_packets_sent_classic; 308 int free_slots_le = 0; 309 310 if (free_slots_classic < 0){ 311 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); 312 return 0; 313 } 314 315 if (hci_stack->le_acl_packets_total_num){ 316 // if we have LE slots, they are used 317 free_slots_le = hci_stack->le_acl_packets_total_num - num_packets_sent_le; 318 if (free_slots_le < 0){ 319 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); 320 return 0; 321 } 322 } else { 323 // otherwise, classic slots are used for LE, too 324 free_slots_classic -= num_packets_sent_le; 325 if (free_slots_classic < 0){ 326 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); 327 return 0; 328 } 329 } 330 331 switch (address_type){ 332 case BD_ADDR_TYPE_UNKNOWN: 333 log_error("hci_number_free_acl_slots: handle 0x%04x not in connection list", con_handle); 334 return 0; 335 336 case BD_ADDR_TYPE_CLASSIC: 337 return free_slots_classic; 338 339 default: 340 if (hci_stack->le_acl_packets_total_num){ 341 return free_slots_le; 342 } 343 return free_slots_classic; 344 } 345 } 346 347 348 // @deprecated 349 int hci_can_send_packet_now(uint8_t packet_type){ 350 switch (packet_type) { 351 case HCI_ACL_DATA_PACKET: 352 return hci_can_send_prepared_acl_packet_now(0); 353 case HCI_COMMAND_DATA_PACKET: 354 return hci_can_send_command_packet_now(); 355 default: 356 return 0; 357 } 358 } 359 360 // @deprecated 361 // same as hci_can_send_packet_now, but also checks if packet buffer is free for use 362 int hci_can_send_packet_now_using_packet_buffer(uint8_t packet_type){ 363 364 if (hci_stack->hci_packet_buffer_reserved) return 0; 365 366 switch (packet_type) { 367 case HCI_ACL_DATA_PACKET: 368 return hci_can_send_acl_packet_now(0); 369 case HCI_COMMAND_DATA_PACKET: 370 return hci_can_send_command_packet_now(); 371 default: 372 return 0; 373 } 374 } 375 376 377 // new functions replacing hci_can_send_packet_now[_using_packet_buffer] 378 int hci_can_send_command_packet_now(void){ 379 if (hci_stack->hci_packet_buffer_reserved) return 0; 380 381 // check for async hci transport implementations 382 if (hci_stack->hci_transport->can_send_packet_now){ 383 if (!hci_stack->hci_transport->can_send_packet_now(HCI_COMMAND_DATA_PACKET)){ 384 return 0; 385 } 386 } 387 388 return hci_stack->num_cmd_packets > 0; 389 } 390 391 int hci_can_send_prepared_acl_packet_now(hci_con_handle_t con_handle) { 392 // check for async hci transport implementations 393 if (hci_stack->hci_transport->can_send_packet_now){ 394 if (!hci_stack->hci_transport->can_send_packet_now(HCI_ACL_DATA_PACKET)){ 395 return 0; 396 } 397 } 398 return hci_number_free_acl_slots_for_handle(con_handle) > 0; 399 } 400 401 int hci_can_send_acl_packet_now(hci_con_handle_t con_handle){ 402 if (hci_stack->hci_packet_buffer_reserved) return 0; 403 return hci_can_send_prepared_acl_packet_now(con_handle); 404 } 405 406 // used for internal checks in l2cap[-le].c 407 int hci_is_packet_buffer_reserved(void){ 408 return hci_stack->hci_packet_buffer_reserved; 409 } 410 411 // reserves outgoing packet buffer. @returns 1 if successful 412 int hci_reserve_packet_buffer(void){ 413 if (hci_stack->hci_packet_buffer_reserved) { 414 log_error("hci_reserve_packet_buffer called but buffer already reserved"); 415 return 0; 416 } 417 hci_stack->hci_packet_buffer_reserved = 1; 418 return 1; 419 } 420 421 void hci_release_packet_buffer(void){ 422 hci_stack->hci_packet_buffer_reserved = 0; 423 } 424 425 // assumption: synchronous implementations don't provide can_send_packet_now as they don't keep the buffer after the call 426 int hci_transport_synchronous(void){ 427 return hci_stack->hci_transport->can_send_packet_now == NULL; 428 } 429 430 uint16_t hci_max_acl_le_data_packet_length(void){ 431 return hci_stack->le_data_packets_length > 0 ? hci_stack->le_data_packets_length : hci_stack->acl_data_packet_length; 432 } 433 434 static int hci_send_acl_packet_fragments(hci_connection_t *connection){ 435 436 // log_info("hci_send_acl_packet_fragments %u/%u (con 0x%04x)", hci_stack->acl_fragmentation_pos, hci_stack->acl_fragmentation_total_size, connection->con_handle); 437 438 // max ACL data packet length depends on connection type (LE vs. Classic) and available buffers 439 uint16_t max_acl_data_packet_length = hci_stack->acl_data_packet_length; 440 if (hci_is_le_connection(connection) && hci_stack->le_data_packets_length > 0){ 441 max_acl_data_packet_length = hci_stack->le_data_packets_length; 442 } 443 444 // testing: reduce buffer to minimum 445 // max_acl_data_packet_length = 52; 446 447 int err; 448 // multiple packets could be send on a synchronous HCI transport 449 while (1){ 450 451 // get current data 452 const uint16_t acl_header_pos = hci_stack->acl_fragmentation_pos - 4; 453 int current_acl_data_packet_length = hci_stack->acl_fragmentation_total_size - hci_stack->acl_fragmentation_pos; 454 int more_fragments = 0; 455 456 // if ACL packet is larger than Bluetooth packet buffer, only send max_acl_data_packet_length 457 if (current_acl_data_packet_length > max_acl_data_packet_length){ 458 more_fragments = 1; 459 current_acl_data_packet_length = max_acl_data_packet_length; 460 } 461 462 // copy handle_and_flags if not first fragment and update packet boundary flags to be 01 (continuing fragmnent) 463 if (acl_header_pos > 0){ 464 uint16_t handle_and_flags = READ_BT_16(hci_stack->hci_packet_buffer, 0); 465 handle_and_flags = (handle_and_flags & 0xcfff) | (1 << 12); 466 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos, handle_and_flags); 467 } 468 469 // update header len 470 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos + 2, current_acl_data_packet_length); 471 472 // count packet 473 connection->num_acl_packets_sent++; 474 475 // send packet 476 uint8_t * packet = &hci_stack->hci_packet_buffer[acl_header_pos]; 477 const int size = current_acl_data_packet_length + 4; 478 hci_dump_packet(HCI_ACL_DATA_PACKET, 0, packet, size); 479 err = hci_stack->hci_transport->send_packet(HCI_ACL_DATA_PACKET, packet, size); 480 481 // done yet? 482 if (!more_fragments) break; 483 484 // update start of next fragment to send 485 hci_stack->acl_fragmentation_pos += current_acl_data_packet_length; 486 487 // can send more? 488 if (!hci_can_send_prepared_acl_packet_now(connection->con_handle)) return err; 489 } 490 491 // done 492 hci_stack->acl_fragmentation_pos = 0; 493 hci_stack->acl_fragmentation_total_size = 0; 494 495 // free buffer now for synchronous transport 496 if (hci_transport_synchronous()){ 497 hci_release_packet_buffer(); 498 } 499 500 return err; 501 } 502 503 // pre: caller has reserved the packet buffer 504 int hci_send_acl_packet_buffer(int size){ 505 506 // log_info("hci_send_acl_packet_buffer size %u", size); 507 508 if (!hci_stack->hci_packet_buffer_reserved) { 509 log_error("hci_send_acl_packet_buffer called without reserving packet buffer"); 510 return 0; 511 } 512 513 uint8_t * packet = hci_stack->hci_packet_buffer; 514 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 515 516 // check for free places on Bluetooth module 517 if (!hci_can_send_prepared_acl_packet_now(con_handle)) { 518 log_error("hci_send_acl_packet_buffer called but no free ACL buffers on controller"); 519 hci_release_packet_buffer(); 520 return BTSTACK_ACL_BUFFERS_FULL; 521 } 522 523 hci_connection_t *connection = hci_connection_for_handle( con_handle); 524 if (!connection) { 525 log_error("hci_send_acl_packet_buffer called but no connection for handle 0x%04x", con_handle); 526 hci_release_packet_buffer(); 527 return 0; 528 } 529 hci_connection_timestamp(connection); 530 531 // hci_dump_packet( HCI_ACL_DATA_PACKET, 0, packet, size); 532 533 // setup data 534 hci_stack->acl_fragmentation_total_size = size; 535 hci_stack->acl_fragmentation_pos = 4; // start of L2CAP packet 536 537 return hci_send_acl_packet_fragments(connection); 538 } 539 540 static void acl_handler(uint8_t *packet, int size){ 541 542 // log_info("acl_handler: size %u", size); 543 544 // get info 545 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 546 hci_connection_t *conn = hci_connection_for_handle(con_handle); 547 uint8_t acl_flags = READ_ACL_FLAGS(packet); 548 uint16_t acl_length = READ_ACL_LENGTH(packet); 549 550 // ignore non-registered handle 551 if (!conn){ 552 log_error( "hci.c: acl_handler called with non-registered handle %u!" , con_handle); 553 return; 554 } 555 556 // assert packet is complete 557 if (acl_length + 4 != size){ 558 log_error("hci.c: acl_handler called with ACL packet of wrong size %u, expected %u => dropping packet", size, acl_length + 4); 559 return; 560 } 561 562 // update idle timestamp 563 hci_connection_timestamp(conn); 564 565 // handle different packet types 566 switch (acl_flags & 0x03) { 567 568 case 0x01: // continuation fragment 569 570 // sanity check 571 if (conn->acl_recombination_pos == 0) { 572 log_error( "ACL Cont Fragment but no first fragment for handle 0x%02x", con_handle); 573 return; 574 } 575 576 // append fragment payload (header already stored) 577 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE + conn->acl_recombination_pos], &packet[4], acl_length ); 578 conn->acl_recombination_pos += acl_length; 579 580 // log_error( "ACL Cont Fragment: acl_len %u, combined_len %u, l2cap_len %u", acl_length, 581 // conn->acl_recombination_pos, conn->acl_recombination_length); 582 583 // forward complete L2CAP packet if complete. 584 if (conn->acl_recombination_pos >= conn->acl_recombination_length + 4 + 4){ // pos already incl. ACL header 585 586 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, &conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], conn->acl_recombination_pos); 587 // reset recombination buffer 588 conn->acl_recombination_length = 0; 589 conn->acl_recombination_pos = 0; 590 } 591 break; 592 593 case 0x02: { // first fragment 594 595 // sanity check 596 if (conn->acl_recombination_pos) { 597 log_error( "ACL First Fragment but data in buffer for handle 0x%02x", con_handle); 598 return; 599 } 600 601 // peek into L2CAP packet! 602 uint16_t l2cap_length = READ_L2CAP_LENGTH( packet ); 603 604 // log_info( "ACL First Fragment: acl_len %u, l2cap_len %u", acl_length, l2cap_length); 605 606 // compare fragment size to L2CAP packet size 607 if (acl_length >= l2cap_length + 4){ 608 609 // forward fragment as L2CAP packet 610 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, packet, acl_length + 4); 611 612 } else { 613 // store first fragment and tweak acl length for complete package 614 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], packet, acl_length + 4); 615 conn->acl_recombination_pos = acl_length + 4; 616 conn->acl_recombination_length = l2cap_length; 617 bt_store_16(conn->acl_recombination_buffer, HCI_INCOMING_PRE_BUFFER_SIZE + 2, l2cap_length +4); 618 } 619 break; 620 621 } 622 default: 623 log_error( "hci.c: acl_handler called with invalid packet boundary flags %u", acl_flags & 0x03); 624 return; 625 } 626 627 // execute main loop 628 hci_run(); 629 } 630 631 static void hci_shutdown_connection(hci_connection_t *conn){ 632 log_info("Connection closed: handle 0x%x, %s", conn->con_handle, bd_addr_to_str(conn->address)); 633 634 run_loop_remove_timer(&conn->timeout); 635 636 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 637 btstack_memory_hci_connection_free( conn ); 638 639 // now it's gone 640 hci_emit_nr_connections_changed(); 641 } 642 643 static const uint16_t packet_type_sizes[] = { 644 0, HCI_ACL_2DH1_SIZE, HCI_ACL_3DH1_SIZE, HCI_ACL_DM1_SIZE, 645 HCI_ACL_DH1_SIZE, 0, 0, 0, 646 HCI_ACL_2DH3_SIZE, HCI_ACL_3DH3_SIZE, HCI_ACL_DM3_SIZE, HCI_ACL_DH3_SIZE, 647 HCI_ACL_2DH5_SIZE, HCI_ACL_3DH5_SIZE, HCI_ACL_DM5_SIZE, HCI_ACL_DH5_SIZE 648 }; 649 static const uint8_t packet_type_feature_requirement_bit[] = { 650 0, // 3 slot packets 651 1, // 5 slot packets 652 25, // EDR 2 mpbs 653 26, // EDR 3 mbps 654 39, // 3 slot EDR packts 655 40, // 5 slot EDR packet 656 }; 657 static const uint16_t packet_type_feature_packet_mask[] = { 658 0x0f00, // 3 slot packets 659 0xf000, // 5 slot packets 660 0x1102, // EDR 2 mpbs 661 0x2204, // EDR 3 mbps 662 0x0300, // 3 slot EDR packts 663 0x3000, // 5 slot EDR packet 664 }; 665 666 static uint16_t hci_acl_packet_types_for_buffer_size_and_local_features(uint16_t buffer_size, uint8_t * local_supported_features){ 667 // enable packet types based on size 668 uint16_t packet_types = 0; 669 int i; 670 for (i=0;i<16;i++){ 671 if (packet_type_sizes[i] == 0) continue; 672 if (packet_type_sizes[i] <= buffer_size){ 673 packet_types |= 1 << i; 674 } 675 } 676 // disable packet types due to missing local supported features 677 for (i=0;i<sizeof(packet_type_feature_requirement_bit);i++){ 678 int bit_idx = packet_type_feature_requirement_bit[i]; 679 int feature_set = (local_supported_features[bit_idx >> 3] & (1<<(bit_idx & 7))) != 0; 680 if (feature_set) continue; 681 log_info("Features bit %02u is not set, removing packet types 0x%04x", bit_idx, packet_type_feature_packet_mask[i]); 682 packet_types &= ~packet_type_feature_packet_mask[i]; 683 } 684 // flip bits for "may not be used" 685 packet_types ^= 0x3306; 686 return packet_types; 687 } 688 689 uint16_t hci_usable_acl_packet_types(void){ 690 return hci_stack->packet_types; 691 } 692 693 uint8_t* hci_get_outgoing_packet_buffer(void){ 694 // hci packet buffer is >= acl data packet length 695 return hci_stack->hci_packet_buffer; 696 } 697 698 uint16_t hci_max_acl_data_packet_length(void){ 699 return hci_stack->acl_data_packet_length; 700 } 701 702 int hci_non_flushable_packet_boundary_flag_supported(void){ 703 // No. 54, byte 6, bit 6 704 return (hci_stack->local_supported_features[6] & (1 << 6)) != 0; 705 } 706 707 int hci_ssp_supported(void){ 708 // No. 51, byte 6, bit 3 709 return (hci_stack->local_supported_features[6] & (1 << 3)) != 0; 710 } 711 712 int hci_classic_supported(void){ 713 // No. 37, byte 4, bit 5, = No BR/EDR Support 714 return (hci_stack->local_supported_features[4] & (1 << 5)) == 0; 715 } 716 717 int hci_le_supported(void){ 718 #ifdef HAVE_BLE 719 // No. 37, byte 4, bit 6 = LE Supported (Controller) 720 return (hci_stack->local_supported_features[4] & (1 << 6)) != 0; 721 #else 722 return 0; 723 #endif 724 } 725 726 // get addr type and address used in advertisement packets 727 void hci_le_advertisement_address(uint8_t * addr_type, bd_addr_t * addr){ 728 *addr_type = hci_stack->adv_addr_type; 729 if (hci_stack->adv_addr_type){ 730 memcpy(addr, hci_stack->adv_address, 6); 731 } else { 732 memcpy(addr, hci_stack->local_bd_addr, 6); 733 } 734 } 735 736 #ifdef HAVE_BLE 737 void le_handle_advertisement_report(uint8_t *packet, int size){ 738 int offset = 3; 739 int num_reports = packet[offset]; 740 offset += 1; 741 742 int i; 743 log_info("HCI: handle adv report with num reports: %d", num_reports); 744 for (i=0; i<num_reports;i++){ 745 uint8_t data_length = packet[offset + 8]; 746 uint8_t event_size = 10 + data_length; 747 uint8_t event[2 + event_size ]; 748 int pos = 0; 749 event[pos++] = GAP_LE_ADVERTISING_REPORT; 750 event[pos++] = event_size; 751 memcpy(&event[pos], &packet[offset], 1+1+6); // event type + address type + address 752 offset += 8; 753 pos += 8; 754 event[pos++] = packet[offset + 1 + data_length]; // rssi 755 event[pos++] = packet[offset++]; //data_length; 756 memcpy(&event[pos], &packet[offset], data_length); 757 pos += data_length; 758 offset += data_length + 1; // rssi 759 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 760 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 761 } 762 } 763 #endif 764 765 static void hci_initializing_event_handler(uint8_t * packet, uint16_t size){ 766 uint8_t command_completed = 0; 767 if ((hci_stack->substate % 2) == 0) return; 768 // odd: waiting for event 769 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 770 uint16_t opcode = READ_BT_16(packet,3); 771 if (opcode == hci_stack->last_cmd_opcode){ 772 command_completed = 1; 773 log_info("Command complete for expected opcode %04x -> new substate %u", opcode, hci_stack->substate); 774 } else { 775 log_info("Command complete for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 776 } 777 } 778 if (packet[0] == HCI_EVENT_COMMAND_STATUS){ 779 uint8_t status = packet[2]; 780 uint16_t opcode = READ_BT_16(packet,4); 781 if (opcode == hci_stack->last_cmd_opcode){ 782 if (status){ 783 command_completed = 1; 784 log_error("Command status error 0x%02x for expected opcode %04x -> new substate %u", status, opcode, hci_stack->substate); 785 } else { 786 log_info("Command status OK for expected opcode %04x, waiting for command complete", opcode); 787 } 788 } else { 789 log_info("Command status for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 790 } 791 } 792 793 if (!command_completed) return; 794 795 switch(hci_stack->substate >> 1){ 796 default: 797 hci_stack->substate++; 798 break; 799 } 800 } 801 802 static void hci_initializing_state_machine(){ 803 // log_info("hci_init: substate %u", hci_stack->substate); 804 if (hci_stack->substate % 2) { 805 // odd: waiting for command completion 806 return; 807 } 808 switch (hci_stack->substate >> 1){ 809 case 0: // RESET 810 hci_state_reset(); 811 812 hci_send_cmd(&hci_reset); 813 if (hci_stack->config == NULL || ((hci_uart_config_t *)hci_stack->config)->baudrate_main == 0){ 814 // skip baud change 815 hci_stack->substate = 4; // >> 1 = 2 816 } 817 break; 818 case 1: // SEND BAUD CHANGE 819 hci_stack->control->baudrate_cmd(hci_stack->config, ((hci_uart_config_t *)hci_stack->config)->baudrate_main, hci_stack->hci_packet_buffer); 820 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 821 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 822 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 823 break; 824 case 2: // LOCAL BAUD CHANGE 825 log_info("Local baud rate change"); 826 hci_stack->hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack->config)->baudrate_main); 827 hci_stack->substate += 2; 828 // break missing here for fall through 829 830 case 3: 831 log_info("Custom init"); 832 // Custom initialization 833 if (hci_stack->control && hci_stack->control->next_cmd){ 834 int valid_cmd = (*hci_stack->control->next_cmd)(hci_stack->config, hci_stack->hci_packet_buffer); 835 if (valid_cmd){ 836 int size = 3 + hci_stack->hci_packet_buffer[2]; 837 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 838 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, hci_stack->hci_packet_buffer, size); 839 hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack->hci_packet_buffer, size); 840 hci_stack->substate = 4; // more init commands 841 break; 842 } 843 log_info("hci_run: init script done"); 844 } 845 // otherwise continue 846 hci_send_cmd(&hci_read_bd_addr); 847 break; 848 case 4: 849 hci_send_cmd(&hci_read_buffer_size); 850 break; 851 case 5: 852 hci_send_cmd(&hci_read_local_supported_features); 853 break; 854 case 6: 855 if (hci_le_supported()){ 856 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 857 } else { 858 // Kensington Bluetoot 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 859 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 860 } 861 862 // skip Classic init commands for LE only chipsets 863 if (!hci_classic_supported()){ 864 if (hci_le_supported()){ 865 hci_stack->substate = 11 << 1; // skip all classic command 866 } else { 867 log_error("Neither BR/EDR nor LE supported"); 868 hci_stack->substate = 14 << 1; // skip all 869 } 870 } 871 break; 872 case 7: 873 if (hci_ssp_supported()){ 874 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack->ssp_enable); 875 break; 876 } 877 hci_stack->substate += 2; 878 // break missing here for fall through 879 880 case 8: 881 // ca. 15 sec 882 hci_send_cmd(&hci_write_page_timeout, 0x6000); 883 break; 884 case 9: 885 hci_send_cmd(&hci_write_class_of_device, hci_stack->class_of_device); 886 break; 887 case 10: 888 if (hci_stack->local_name){ 889 hci_send_cmd(&hci_write_local_name, hci_stack->local_name); 890 } else { 891 char hostname[30]; 892 #ifdef EMBEDDED 893 // BTstack-11:22:33:44:55:66 894 strcpy(hostname, "BTstack "); 895 strcat(hostname, bd_addr_to_str(hci_stack->local_bd_addr)); 896 log_info("---> Name %s", hostname); 897 #else 898 // hostname for POSIX systems 899 gethostname(hostname, 30); 900 hostname[29] = '\0'; 901 #endif 902 hci_send_cmd(&hci_write_local_name, hostname); 903 } 904 break; 905 case 11: 906 hci_send_cmd(&hci_write_scan_enable, (hci_stack->connectable << 1) | hci_stack->discoverable); // page scan 907 if (!hci_le_supported()){ 908 // SKIP LE init for Classic only configuration 909 hci_stack->substate = 14 << 1; 910 } 911 break; 912 913 #ifdef HAVE_BLE 914 // LE INIT 915 case 12: 916 hci_send_cmd(&hci_le_read_buffer_size); 917 break; 918 case 13: 919 // LE Supported Host = 1, Simultaneous Host = 0 920 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 921 break; 922 case 14: 923 // LE Scan Parameters: active scanning, 300 ms interval, 30 ms window, public address, accept all advs 924 hci_send_cmd(&hci_le_set_scan_parameters, 1, 0x1e0, 0x30, 0, 0); 925 break; 926 #endif 927 928 // DONE 929 case 15: 930 // done. 931 hci_stack->state = HCI_STATE_WORKING; 932 hci_emit_state(); 933 break; 934 default: 935 break; 936 } 937 hci_stack->substate++; 938 } 939 940 // avoid huge local variables 941 #ifndef EMBEDDED 942 static device_name_t device_name; 943 #endif 944 static void event_handler(uint8_t *packet, int size){ 945 946 uint16_t event_length = packet[1]; 947 948 // assert packet is complete 949 if (size != event_length + 2){ 950 log_error("hci.c: event_handler called with event packet of wrong size %u, expected %u => dropping packet", size, event_length + 2); 951 return; 952 } 953 954 bd_addr_t addr; 955 bd_addr_type_t addr_type; 956 uint8_t link_type; 957 hci_con_handle_t handle; 958 hci_connection_t * conn; 959 int i; 960 961 // log_info("HCI:EVENT:%02x", packet[0]); 962 963 switch (packet[0]) { 964 965 case HCI_EVENT_COMMAND_COMPLETE: 966 // get num cmd packets 967 // log_info("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u", hci_stack->num_cmd_packets, packet[2]); 968 hci_stack->num_cmd_packets = packet[2]; 969 970 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 971 // from offset 5 972 // status 973 // "The HC_ACL_Data_Packet_Length return parameter will be used to determine the size of the L2CAP segments contained in ACL Data Packets" 974 hci_stack->acl_data_packet_length = READ_BT_16(packet, 6); 975 // ignore: SCO data packet len (8) 976 hci_stack->acl_packets_total_num = packet[9]; 977 // ignore: total num SCO packets 978 if (hci_stack->state == HCI_STATE_INITIALIZING){ 979 // determine usable ACL payload size 980 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->acl_data_packet_length){ 981 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 982 } 983 log_info("hci_read_buffer_size: used size %u, count %u", 984 hci_stack->acl_data_packet_length, hci_stack->acl_packets_total_num); 985 } 986 } 987 #ifdef HAVE_BLE 988 if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_buffer_size)){ 989 hci_stack->le_data_packets_length = READ_BT_16(packet, 6); 990 hci_stack->le_acl_packets_total_num = packet[8]; 991 // determine usable ACL payload size 992 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->le_data_packets_length){ 993 hci_stack->le_data_packets_length = HCI_ACL_PAYLOAD_SIZE; 994 } 995 log_info("hci_le_read_buffer_size: size %u, count %u", hci_stack->le_data_packets_length, hci_stack->le_acl_packets_total_num); 996 } 997 #endif 998 // Dump local address 999 if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)) { 1000 bt_flip_addr(hci_stack->local_bd_addr, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1]); 1001 log_info("Local Address, Status: 0x%02x: Addr: %s", 1002 packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE], bd_addr_to_str(hci_stack->local_bd_addr)); 1003 } 1004 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1005 hci_emit_discoverable_enabled(hci_stack->discoverable); 1006 } 1007 // Note: HCI init checks 1008 if (COMMAND_COMPLETE_EVENT(packet, hci_read_local_supported_features)){ 1009 memcpy(hci_stack->local_supported_features, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1], 8); 1010 log_info("Local Supported Features: 0x%02x%02x%02x%02x%02x%02x%02x%02x", 1011 hci_stack->local_supported_features[0], hci_stack->local_supported_features[1], 1012 hci_stack->local_supported_features[2], hci_stack->local_supported_features[3], 1013 hci_stack->local_supported_features[4], hci_stack->local_supported_features[5], 1014 hci_stack->local_supported_features[6], hci_stack->local_supported_features[7]); 1015 1016 // determine usable ACL packet types based buffer size and supported features 1017 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]); 1018 log_info("packet types %04x", hci_stack->packet_types); 1019 1020 // Classic/LE 1021 log_info("BR/EDR support %u, LE support %u", hci_classic_supported(), hci_le_supported()); 1022 } 1023 break; 1024 1025 case HCI_EVENT_COMMAND_STATUS: 1026 // get num cmd packets 1027 // log_info("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u", hci_stack->num_cmd_packets, packet[3]); 1028 hci_stack->num_cmd_packets = packet[3]; 1029 break; 1030 1031 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:{ 1032 int offset = 3; 1033 for (i=0; i<packet[2];i++){ 1034 handle = READ_BT_16(packet, offset); 1035 offset += 2; 1036 uint16_t num_packets = READ_BT_16(packet, offset); 1037 offset += 2; 1038 1039 conn = hci_connection_for_handle(handle); 1040 if (!conn){ 1041 log_error("hci_number_completed_packet lists unused con handle %u", handle); 1042 continue; 1043 } 1044 1045 if (conn->num_acl_packets_sent >= num_packets){ 1046 conn->num_acl_packets_sent -= num_packets; 1047 } else { 1048 log_error("hci_number_completed_packets, more slots freed then sent."); 1049 conn->num_acl_packets_sent = 0; 1050 } 1051 // log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u", num_packets, handle, conn->num_acl_packets_sent); 1052 } 1053 break; 1054 } 1055 case HCI_EVENT_CONNECTION_REQUEST: 1056 bt_flip_addr(addr, &packet[2]); 1057 // TODO: eval COD 8-10 1058 link_type = packet[11]; 1059 log_info("Connection_incoming: %s, type %u", bd_addr_to_str(addr), link_type); 1060 if (link_type == 1) { // ACL 1061 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1062 if (!conn) { 1063 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 1064 } 1065 if (!conn) { 1066 // CONNECTION REJECTED DUE TO LIMITED RESOURCES (0X0D) 1067 hci_stack->decline_reason = 0x0d; 1068 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1069 break; 1070 } 1071 conn->state = RECEIVED_CONNECTION_REQUEST; 1072 hci_run(); 1073 } else { 1074 // SYNCHRONOUS CONNECTION LIMIT TO A DEVICE EXCEEDED (0X0A) 1075 hci_stack->decline_reason = 0x0a; 1076 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1077 } 1078 break; 1079 1080 case HCI_EVENT_CONNECTION_COMPLETE: 1081 // Connection management 1082 bt_flip_addr(addr, &packet[5]); 1083 log_info("Connection_complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 1084 addr_type = BD_ADDR_TYPE_CLASSIC; 1085 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1086 if (conn) { 1087 if (!packet[2]){ 1088 conn->state = OPEN; 1089 conn->con_handle = READ_BT_16(packet, 3); 1090 conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES; 1091 1092 // restart timer 1093 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1094 run_loop_add_timer(&conn->timeout); 1095 1096 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1097 1098 hci_emit_nr_connections_changed(); 1099 } else { 1100 int notify_dedicated_bonding_failed = conn->bonding_flags & BONDING_DEDICATED; 1101 uint8_t status = packet[2]; 1102 bd_addr_t bd_address; 1103 memcpy(&bd_address, conn->address, 6); 1104 1105 // connection failed, remove entry 1106 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1107 btstack_memory_hci_connection_free( conn ); 1108 1109 // notify client if dedicated bonding 1110 if (notify_dedicated_bonding_failed){ 1111 log_info("hci notify_dedicated_bonding_failed"); 1112 hci_emit_dedicated_bonding_result(bd_address, status); 1113 } 1114 1115 // if authentication error, also delete link key 1116 if (packet[2] == 0x05) { 1117 hci_drop_link_key_for_bd_addr(&addr); 1118 } 1119 } 1120 } 1121 break; 1122 1123 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 1124 handle = READ_BT_16(packet, 3); 1125 conn = hci_connection_for_handle(handle); 1126 if (!conn) break; 1127 if (!packet[2]){ 1128 uint8_t * features = &packet[5]; 1129 if (features[6] & (1 << 3)){ 1130 conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP; 1131 } 1132 } 1133 conn->bonding_flags |= BONDING_RECEIVED_REMOTE_FEATURES; 1134 log_info("HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE, bonding flags %x", conn->bonding_flags); 1135 if (conn->bonding_flags & BONDING_DEDICATED){ 1136 conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 1137 } 1138 break; 1139 1140 case HCI_EVENT_LINK_KEY_REQUEST: 1141 log_info("HCI_EVENT_LINK_KEY_REQUEST"); 1142 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 1143 // non-bondable mode: link key negative reply will be sent by HANDLE_LINK_KEY_REQUEST 1144 if (hci_stack->bondable && !hci_stack->remote_device_db) break; 1145 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], HANDLE_LINK_KEY_REQUEST); 1146 hci_run(); 1147 // request handled by hci_run() as HANDLE_LINK_KEY_REQUEST gets set 1148 return; 1149 1150 case HCI_EVENT_LINK_KEY_NOTIFICATION: { 1151 bt_flip_addr(addr, &packet[2]); 1152 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1153 if (!conn) break; 1154 conn->authentication_flags |= RECV_LINK_KEY_NOTIFICATION; 1155 link_key_type_t link_key_type = (link_key_type_t)packet[24]; 1156 // Change Connection Encryption keeps link key type 1157 if (link_key_type != CHANGED_COMBINATION_KEY){ 1158 conn->link_key_type = link_key_type; 1159 } 1160 if (!hci_stack->remote_device_db) break; 1161 hci_stack->remote_device_db->put_link_key(&addr, (link_key_t *) &packet[8], conn->link_key_type); 1162 // still forward event to allow dismiss of pairing dialog 1163 break; 1164 } 1165 1166 case HCI_EVENT_PIN_CODE_REQUEST: 1167 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], LEGACY_PAIRING_ACTIVE); 1168 // non-bondable mode: pin code negative reply will be sent 1169 if (!hci_stack->bondable){ 1170 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], DENY_PIN_CODE_REQUEST); 1171 hci_run(); 1172 return; 1173 } 1174 // PIN CODE REQUEST means the link key request didn't succee -> delete stored link key 1175 if (!hci_stack->remote_device_db) break; 1176 bt_flip_addr(addr, &packet[2]); 1177 hci_stack->remote_device_db->delete_link_key(&addr); 1178 break; 1179 1180 case HCI_EVENT_IO_CAPABILITY_REQUEST: 1181 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_IO_CAPABILITIES_REQUEST); 1182 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_IO_CAPABILITIES_REPLY); 1183 break; 1184 1185 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 1186 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1187 if (!hci_stack->ssp_auto_accept) break; 1188 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_CONFIRM_REPLY); 1189 break; 1190 1191 case HCI_EVENT_USER_PASSKEY_REQUEST: 1192 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1193 if (!hci_stack->ssp_auto_accept) break; 1194 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_PASSKEY_REPLY); 1195 break; 1196 1197 case HCI_EVENT_ENCRYPTION_CHANGE: 1198 handle = READ_BT_16(packet, 3); 1199 conn = hci_connection_for_handle(handle); 1200 if (!conn) break; 1201 if (packet[2] == 0) { 1202 if (packet[5]){ 1203 conn->authentication_flags |= CONNECTION_ENCRYPTED; 1204 } else { 1205 conn->authentication_flags &= ~CONNECTION_ENCRYPTED; 1206 } 1207 } 1208 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1209 break; 1210 1211 case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT: 1212 handle = READ_BT_16(packet, 3); 1213 conn = hci_connection_for_handle(handle); 1214 if (!conn) break; 1215 1216 // dedicated bonding: send result and disconnect 1217 if (conn->bonding_flags & BONDING_DEDICATED){ 1218 conn->bonding_flags &= ~BONDING_DEDICATED; 1219 conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE; 1220 conn->bonding_status = packet[2]; 1221 break; 1222 } 1223 1224 if (packet[2] == 0 && gap_security_level_for_link_key_type(conn->link_key_type) >= conn->requested_security_level){ 1225 // link key sufficient for requested security 1226 conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 1227 break; 1228 } 1229 // not enough 1230 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1231 break; 1232 1233 #ifndef EMBEDDED 1234 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 1235 if (!hci_stack->remote_device_db) break; 1236 if (packet[2]) break; // status not ok 1237 bt_flip_addr(addr, &packet[3]); 1238 // fix for invalid remote names - terminate on 0xff 1239 for (i=0; i<248;i++){ 1240 if (packet[9+i] == 0xff){ 1241 packet[9+i] = 0; 1242 break; 1243 } 1244 } 1245 memset(&device_name, 0, sizeof(device_name_t)); 1246 strncpy((char*) device_name, (char*) &packet[9], 248); 1247 hci_stack->remote_device_db->put_name(&addr, &device_name); 1248 break; 1249 1250 case HCI_EVENT_INQUIRY_RESULT: 1251 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:{ 1252 if (!hci_stack->remote_device_db) break; 1253 // first send inq result packet 1254 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1255 // then send cached remote names 1256 int offset = 3; 1257 for (i=0; i<packet[2];i++){ 1258 bt_flip_addr(addr, &packet[offset]); 1259 offset += 14; // 6 + 1 + 1 + 1 + 3 + 2; 1260 if (hci_stack->remote_device_db->get_name(&addr, &device_name)){ 1261 hci_emit_remote_name_cached(&addr, &device_name); 1262 } 1263 } 1264 return; 1265 } 1266 #endif 1267 1268 // HCI_EVENT_DISCONNECTION_COMPLETE 1269 // has been moved down, to first notify stack before shutting connection down 1270 1271 case HCI_EVENT_HARDWARE_ERROR: 1272 if(hci_stack->control && hci_stack->control->hw_error){ 1273 (*hci_stack->control->hw_error)(); 1274 } else { 1275 // if no special requests, just reboot stack 1276 hci_power_control_off(); 1277 hci_power_control_on(); 1278 } 1279 break; 1280 1281 case DAEMON_EVENT_HCI_PACKET_SENT: 1282 // free packet buffer for asynchronous transport 1283 if (hci_transport_synchronous()) break; 1284 hci_stack->hci_packet_buffer_reserved = 0; 1285 break; 1286 1287 #ifdef HAVE_BLE 1288 case HCI_EVENT_LE_META: 1289 switch (packet[2]){ 1290 case HCI_SUBEVENT_LE_ADVERTISING_REPORT: 1291 log_info("advertising report received"); 1292 if (hci_stack->le_scanning_state != LE_SCANNING) break; 1293 le_handle_advertisement_report(packet, size); 1294 break; 1295 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 1296 // Connection management 1297 bt_flip_addr(addr, &packet[8]); 1298 addr_type = (bd_addr_type_t)packet[7]; 1299 log_info("LE Connection_complete (status=%u) type %u, %s", packet[3], addr_type, bd_addr_to_str(addr)); 1300 // LE connections are auto-accepted, so just create a connection if there isn't one already 1301 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1302 if (packet[3]){ 1303 if (conn){ 1304 // outgoing connection failed, remove entry 1305 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1306 btstack_memory_hci_connection_free( conn ); 1307 } 1308 // if authentication error, also delete link key 1309 if (packet[3] == 0x05) { 1310 hci_drop_link_key_for_bd_addr(&addr); 1311 } 1312 break; 1313 } 1314 if (!conn){ 1315 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 1316 } 1317 if (!conn){ 1318 // no memory 1319 break; 1320 } 1321 1322 conn->state = OPEN; 1323 conn->con_handle = READ_BT_16(packet, 4); 1324 1325 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 1326 1327 // restart timer 1328 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1329 // run_loop_add_timer(&conn->timeout); 1330 1331 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1332 1333 hci_emit_nr_connections_changed(); 1334 break; 1335 1336 // log_info("LE buffer size: %u, count %u", READ_BT_16(packet,6), packet[8]); 1337 1338 default: 1339 break; 1340 } 1341 break; 1342 #endif 1343 default: 1344 break; 1345 } 1346 1347 // handle BT initialization 1348 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1349 hci_initializing_event_handler(packet, size); 1350 } 1351 1352 // help with BT sleep 1353 if (hci_stack->state == HCI_STATE_FALLING_ASLEEP 1354 && hci_stack->substate == 1 1355 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1356 hci_stack->substate++; 1357 } 1358 1359 // notify upper stack 1360 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1361 1362 // moved here to give upper stack a chance to close down everything with hci_connection_t intact 1363 if (packet[0] == HCI_EVENT_DISCONNECTION_COMPLETE){ 1364 if (!packet[2]){ 1365 handle = READ_BT_16(packet, 3); 1366 hci_connection_t * conn = hci_connection_for_handle(handle); 1367 if (conn) { 1368 uint8_t status = conn->bonding_status; 1369 bd_addr_t bd_address; 1370 memcpy(&bd_address, conn->address, 6); 1371 hci_shutdown_connection(conn); 1372 if (conn->bonding_flags & BONDING_EMIT_COMPLETE_ON_DISCONNECT){ 1373 hci_emit_dedicated_bonding_result(bd_address, status); 1374 } 1375 } 1376 } 1377 } 1378 1379 // execute main loop 1380 hci_run(); 1381 } 1382 1383 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1384 hci_dump_packet(packet_type, 1, packet, size); 1385 switch (packet_type) { 1386 case HCI_EVENT_PACKET: 1387 event_handler(packet, size); 1388 break; 1389 case HCI_ACL_DATA_PACKET: 1390 acl_handler(packet, size); 1391 break; 1392 default: 1393 break; 1394 } 1395 } 1396 1397 /** Register HCI packet handlers */ 1398 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 1399 hci_stack->packet_handler = handler; 1400 } 1401 1402 static void hci_state_reset(){ 1403 // no connections yet 1404 hci_stack->connections = NULL; 1405 1406 // keep discoverable/connectable as this has been requested by the client(s) 1407 // hci_stack->discoverable = 0; 1408 // hci_stack->connectable = 0; 1409 // hci_stack->bondable = 1; 1410 1411 // buffer is free 1412 hci_stack->hci_packet_buffer_reserved = 0; 1413 1414 // no pending cmds 1415 hci_stack->decline_reason = 0; 1416 hci_stack->new_scan_enable_value = 0xff; 1417 1418 // LE 1419 hci_stack->adv_addr_type = 0; 1420 memset(hci_stack->adv_address, 0, 6); 1421 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1422 hci_stack->le_scan_type = 0xff; 1423 hci_stack->le_connection_parameter_range.le_conn_interval_min = 0x0006; 1424 hci_stack->le_connection_parameter_range.le_conn_interval_max = 0x0C80; 1425 hci_stack->le_connection_parameter_range.le_conn_latency_min = 0x0000; 1426 hci_stack->le_connection_parameter_range.le_conn_latency_max = 0x03E8; 1427 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = 0x000A; 1428 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = 0x0C80; 1429 } 1430 1431 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 1432 1433 #ifdef HAVE_MALLOC 1434 if (!hci_stack) { 1435 hci_stack = (hci_stack_t*) malloc(sizeof(hci_stack_t)); 1436 } 1437 #else 1438 hci_stack = &hci_stack_static; 1439 #endif 1440 memset(hci_stack, 0, sizeof(hci_stack_t)); 1441 1442 // reference to use transport layer implementation 1443 hci_stack->hci_transport = transport; 1444 1445 // references to used control implementation 1446 hci_stack->control = control; 1447 1448 // reference to used config 1449 hci_stack->config = config; 1450 1451 // higher level handler 1452 hci_stack->packet_handler = dummy_handler; 1453 1454 // store and open remote device db 1455 hci_stack->remote_device_db = remote_device_db; 1456 if (hci_stack->remote_device_db) { 1457 hci_stack->remote_device_db->open(); 1458 } 1459 1460 // max acl payload size defined in config.h 1461 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1462 1463 // register packet handlers with transport 1464 transport->register_packet_handler(&packet_handler); 1465 1466 hci_stack->state = HCI_STATE_OFF; 1467 1468 // class of device 1469 hci_stack->class_of_device = 0x007a020c; // Smartphone 1470 1471 // bondable by default 1472 hci_stack->bondable = 1; 1473 1474 // Secure Simple Pairing default: enable, no I/O capabilities, general bonding, mitm not required, auto accept 1475 hci_stack->ssp_enable = 1; 1476 hci_stack->ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 1477 hci_stack->ssp_authentication_requirement = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING; 1478 hci_stack->ssp_auto_accept = 1; 1479 1480 hci_state_reset(); 1481 } 1482 1483 void hci_close(){ 1484 // close remote device db 1485 if (hci_stack->remote_device_db) { 1486 hci_stack->remote_device_db->close(); 1487 } 1488 while (hci_stack->connections) { 1489 // cancel all l2cap connections 1490 hci_emit_disconnection_complete(((hci_connection_t *) hci_stack->connections)->con_handle, 0x16); // terminated by local host 1491 hci_shutdown_connection((hci_connection_t *) hci_stack->connections); 1492 } 1493 hci_power_control(HCI_POWER_OFF); 1494 1495 #ifdef HAVE_MALLOC 1496 free(hci_stack); 1497 #endif 1498 hci_stack = NULL; 1499 } 1500 1501 void hci_set_class_of_device(uint32_t class_of_device){ 1502 hci_stack->class_of_device = class_of_device; 1503 } 1504 1505 void hci_disable_l2cap_timeout_check(){ 1506 disable_l2cap_timeouts = 1; 1507 } 1508 // State-Module-Driver overview 1509 // state module low-level 1510 // HCI_STATE_OFF off close 1511 // HCI_STATE_INITIALIZING, on open 1512 // HCI_STATE_WORKING, on open 1513 // HCI_STATE_HALTING, on open 1514 // HCI_STATE_SLEEPING, off/sleep close 1515 // HCI_STATE_FALLING_ASLEEP on open 1516 1517 static int hci_power_control_on(void){ 1518 1519 // power on 1520 int err = 0; 1521 if (hci_stack->control && hci_stack->control->on){ 1522 err = (*hci_stack->control->on)(hci_stack->config); 1523 } 1524 if (err){ 1525 log_error( "POWER_ON failed"); 1526 hci_emit_hci_open_failed(); 1527 return err; 1528 } 1529 1530 // open low-level device 1531 err = hci_stack->hci_transport->open(hci_stack->config); 1532 if (err){ 1533 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1534 if (hci_stack->control && hci_stack->control->off){ 1535 (*hci_stack->control->off)(hci_stack->config); 1536 } 1537 hci_emit_hci_open_failed(); 1538 return err; 1539 } 1540 return 0; 1541 } 1542 1543 static void hci_power_control_off(void){ 1544 1545 log_info("hci_power_control_off"); 1546 1547 // close low-level device 1548 hci_stack->hci_transport->close(hci_stack->config); 1549 1550 log_info("hci_power_control_off - hci_transport closed"); 1551 1552 // power off 1553 if (hci_stack->control && hci_stack->control->off){ 1554 (*hci_stack->control->off)(hci_stack->config); 1555 } 1556 1557 log_info("hci_power_control_off - control closed"); 1558 1559 hci_stack->state = HCI_STATE_OFF; 1560 } 1561 1562 static void hci_power_control_sleep(void){ 1563 1564 log_info("hci_power_control_sleep"); 1565 1566 #if 0 1567 // don't close serial port during sleep 1568 1569 // close low-level device 1570 hci_stack->hci_transport->close(hci_stack->config); 1571 #endif 1572 1573 // sleep mode 1574 if (hci_stack->control && hci_stack->control->sleep){ 1575 (*hci_stack->control->sleep)(hci_stack->config); 1576 } 1577 1578 hci_stack->state = HCI_STATE_SLEEPING; 1579 } 1580 1581 static int hci_power_control_wake(void){ 1582 1583 log_info("hci_power_control_wake"); 1584 1585 // wake on 1586 if (hci_stack->control && hci_stack->control->wake){ 1587 (*hci_stack->control->wake)(hci_stack->config); 1588 } 1589 1590 #if 0 1591 // open low-level device 1592 int err = hci_stack->hci_transport->open(hci_stack->config); 1593 if (err){ 1594 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1595 if (hci_stack->control && hci_stack->control->off){ 1596 (*hci_stack->control->off)(hci_stack->config); 1597 } 1598 hci_emit_hci_open_failed(); 1599 return err; 1600 } 1601 #endif 1602 1603 return 0; 1604 } 1605 1606 static void hci_power_transition_to_initializing(void){ 1607 // set up state machine 1608 hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent 1609 hci_stack->hci_packet_buffer_reserved = 0; 1610 hci_stack->state = HCI_STATE_INITIALIZING; 1611 hci_stack->substate = 0; 1612 } 1613 1614 int hci_power_control(HCI_POWER_MODE power_mode){ 1615 1616 log_info("hci_power_control: %u, current mode %u", power_mode, hci_stack->state); 1617 1618 int err = 0; 1619 switch (hci_stack->state){ 1620 1621 case HCI_STATE_OFF: 1622 switch (power_mode){ 1623 case HCI_POWER_ON: 1624 err = hci_power_control_on(); 1625 if (err) { 1626 log_error("hci_power_control_on() error %u", err); 1627 return err; 1628 } 1629 hci_power_transition_to_initializing(); 1630 break; 1631 case HCI_POWER_OFF: 1632 // do nothing 1633 break; 1634 case HCI_POWER_SLEEP: 1635 // do nothing (with SLEEP == OFF) 1636 break; 1637 } 1638 break; 1639 1640 case HCI_STATE_INITIALIZING: 1641 switch (power_mode){ 1642 case HCI_POWER_ON: 1643 // do nothing 1644 break; 1645 case HCI_POWER_OFF: 1646 // no connections yet, just turn it off 1647 hci_power_control_off(); 1648 break; 1649 case HCI_POWER_SLEEP: 1650 // no connections yet, just turn it off 1651 hci_power_control_sleep(); 1652 break; 1653 } 1654 break; 1655 1656 case HCI_STATE_WORKING: 1657 switch (power_mode){ 1658 case HCI_POWER_ON: 1659 // do nothing 1660 break; 1661 case HCI_POWER_OFF: 1662 // see hci_run 1663 hci_stack->state = HCI_STATE_HALTING; 1664 break; 1665 case HCI_POWER_SLEEP: 1666 // see hci_run 1667 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1668 hci_stack->substate = 0; 1669 break; 1670 } 1671 break; 1672 1673 case HCI_STATE_HALTING: 1674 switch (power_mode){ 1675 case HCI_POWER_ON: 1676 hci_power_transition_to_initializing(); 1677 break; 1678 case HCI_POWER_OFF: 1679 // do nothing 1680 break; 1681 case HCI_POWER_SLEEP: 1682 // see hci_run 1683 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1684 hci_stack->substate = 0; 1685 break; 1686 } 1687 break; 1688 1689 case HCI_STATE_FALLING_ASLEEP: 1690 switch (power_mode){ 1691 case HCI_POWER_ON: 1692 1693 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1694 // nothing to do, if H4 supports power management 1695 if (bt_control_iphone_power_management_enabled()){ 1696 hci_stack->state = HCI_STATE_INITIALIZING; 1697 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1698 break; 1699 } 1700 #endif 1701 hci_power_transition_to_initializing(); 1702 break; 1703 case HCI_POWER_OFF: 1704 // see hci_run 1705 hci_stack->state = HCI_STATE_HALTING; 1706 break; 1707 case HCI_POWER_SLEEP: 1708 // do nothing 1709 break; 1710 } 1711 break; 1712 1713 case HCI_STATE_SLEEPING: 1714 switch (power_mode){ 1715 case HCI_POWER_ON: 1716 1717 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1718 // nothing to do, if H4 supports power management 1719 if (bt_control_iphone_power_management_enabled()){ 1720 hci_stack->state = HCI_STATE_INITIALIZING; 1721 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1722 hci_update_scan_enable(); 1723 break; 1724 } 1725 #endif 1726 err = hci_power_control_wake(); 1727 if (err) return err; 1728 hci_power_transition_to_initializing(); 1729 break; 1730 case HCI_POWER_OFF: 1731 hci_stack->state = HCI_STATE_HALTING; 1732 break; 1733 case HCI_POWER_SLEEP: 1734 // do nothing 1735 break; 1736 } 1737 break; 1738 } 1739 1740 // create internal event 1741 hci_emit_state(); 1742 1743 // trigger next/first action 1744 hci_run(); 1745 1746 return 0; 1747 } 1748 1749 static void hci_update_scan_enable(void){ 1750 // 2 = page scan, 1 = inq scan 1751 hci_stack->new_scan_enable_value = hci_stack->connectable << 1 | hci_stack->discoverable; 1752 hci_run(); 1753 } 1754 1755 void hci_discoverable_control(uint8_t enable){ 1756 if (enable) enable = 1; // normalize argument 1757 1758 if (hci_stack->discoverable == enable){ 1759 hci_emit_discoverable_enabled(hci_stack->discoverable); 1760 return; 1761 } 1762 1763 hci_stack->discoverable = enable; 1764 hci_update_scan_enable(); 1765 } 1766 1767 void hci_connectable_control(uint8_t enable){ 1768 if (enable) enable = 1; // normalize argument 1769 1770 // don't emit event 1771 if (hci_stack->connectable == enable) return; 1772 1773 hci_stack->connectable = enable; 1774 hci_update_scan_enable(); 1775 } 1776 1777 bd_addr_t * hci_local_bd_addr(void){ 1778 return &hci_stack->local_bd_addr; 1779 } 1780 1781 void hci_run(){ 1782 1783 hci_connection_t * connection; 1784 linked_item_t * it; 1785 1786 if (!hci_can_send_command_packet_now()) return; 1787 1788 // global/non-connection oriented commands 1789 1790 // decline incoming connections 1791 if (hci_stack->decline_reason){ 1792 uint8_t reason = hci_stack->decline_reason; 1793 hci_stack->decline_reason = 0; 1794 hci_send_cmd(&hci_reject_connection_request, hci_stack->decline_addr, reason); 1795 return; 1796 } 1797 1798 // send scan enable 1799 if (hci_stack->state == HCI_STATE_WORKING && hci_stack->new_scan_enable_value != 0xff && hci_classic_supported()){ 1800 hci_send_cmd(&hci_write_scan_enable, hci_stack->new_scan_enable_value); 1801 hci_stack->new_scan_enable_value = 0xff; 1802 return; 1803 } 1804 1805 #ifdef HAVE_BLE 1806 // handle le scan 1807 if (hci_stack->state == HCI_STATE_WORKING){ 1808 switch(hci_stack->le_scanning_state){ 1809 case LE_START_SCAN: 1810 hci_stack->le_scanning_state = LE_SCANNING; 1811 hci_send_cmd(&hci_le_set_scan_enable, 1, 0); 1812 return; 1813 1814 case LE_STOP_SCAN: 1815 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1816 hci_send_cmd(&hci_le_set_scan_enable, 0, 0); 1817 return; 1818 default: 1819 break; 1820 } 1821 if (hci_stack->le_scan_type != 0xff){ 1822 // defaults: active scanning, accept all advertisement packets 1823 int scan_type = hci_stack->le_scan_type; 1824 hci_stack->le_scan_type = 0xff; 1825 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); 1826 return; 1827 } 1828 } 1829 #endif 1830 1831 // send pending HCI commands 1832 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 1833 connection = (hci_connection_t *) it; 1834 1835 switch(connection->state){ 1836 case SEND_CREATE_CONNECTION: 1837 switch(connection->address_type){ 1838 case BD_ADDR_TYPE_CLASSIC: 1839 log_info("sending hci_create_connection"); 1840 hci_send_cmd(&hci_create_connection, connection->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 1841 break; 1842 default: 1843 #ifdef HAVE_BLE 1844 log_info("sending hci_le_create_connection"); 1845 hci_send_cmd(&hci_le_create_connection, 1846 0x0060, // scan interval: 60 ms 1847 0x0030, // scan interval: 30 ms 1848 0, // don't use whitelist 1849 connection->address_type, // peer address type 1850 connection->address, // peer bd addr 1851 hci_stack->adv_addr_type, // our addr type: 1852 0x0008, // conn interval min 1853 0x0018, // conn interval max 1854 0, // conn latency 1855 0x0048, // supervision timeout 1856 0x0001, // min ce length 1857 0x0001 // max ce length 1858 ); 1859 1860 connection->state = SENT_CREATE_CONNECTION; 1861 #endif 1862 break; 1863 } 1864 return; 1865 1866 case RECEIVED_CONNECTION_REQUEST: 1867 log_info("sending hci_accept_connection_request"); 1868 connection->state = ACCEPTED_CONNECTION_REQUEST; 1869 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 1870 return; 1871 1872 #ifdef HAVE_BLE 1873 case SEND_CANCEL_CONNECTION: 1874 connection->state = SENT_CANCEL_CONNECTION; 1875 hci_send_cmd(&hci_le_create_connection_cancel); 1876 return; 1877 #endif 1878 case SEND_DISCONNECT: 1879 connection->state = SENT_DISCONNECT; 1880 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1881 return; 1882 1883 default: 1884 break; 1885 } 1886 1887 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 1888 log_info("responding to link key request"); 1889 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 1890 link_key_t link_key; 1891 link_key_type_t link_key_type; 1892 if ( hci_stack->remote_device_db 1893 && hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type) 1894 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 1895 connection->link_key_type = link_key_type; 1896 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 1897 } else { 1898 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 1899 } 1900 return; 1901 } 1902 1903 if (connection->authentication_flags & DENY_PIN_CODE_REQUEST){ 1904 log_info("denying to pin request"); 1905 connectionClearAuthenticationFlags(connection, DENY_PIN_CODE_REQUEST); 1906 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 1907 return; 1908 } 1909 1910 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 1911 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 1912 log_info("IO Capability Request received, stack bondable %u, io cap %u", hci_stack->bondable, hci_stack->ssp_io_capability); 1913 if (hci_stack->bondable && (hci_stack->ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN)){ 1914 // tweak authentication requirements 1915 uint8_t authreq = hci_stack->ssp_authentication_requirement; 1916 if (connection->bonding_flags & BONDING_DEDICATED){ 1917 authreq = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING; 1918 } 1919 if (gap_mitm_protection_required_for_security_level(connection->requested_security_level)){ 1920 authreq |= 1; 1921 } 1922 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack->ssp_io_capability, NULL, authreq); 1923 } else { 1924 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 1925 } 1926 return; 1927 } 1928 1929 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 1930 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 1931 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 1932 return; 1933 } 1934 1935 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 1936 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 1937 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 1938 return; 1939 } 1940 1941 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 1942 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 1943 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 1944 return; 1945 } 1946 1947 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 1948 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 1949 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 1950 return; 1951 } 1952 if (connection->bonding_flags & BONDING_DISCONNECT_DEDICATED_DONE){ 1953 connection->bonding_flags &= ~BONDING_DISCONNECT_DEDICATED_DONE; 1954 connection->bonding_flags |= BONDING_EMIT_COMPLETE_ON_DISCONNECT; 1955 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // authentication done 1956 return; 1957 } 1958 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 1959 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 1960 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 1961 return; 1962 } 1963 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 1964 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 1965 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 1966 return; 1967 } 1968 1969 #ifdef HAVE_BLE 1970 if (connection->le_con_parameter_update_state == CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS){ 1971 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 1972 1973 uint16_t connection_interval_min = connection->le_conn_interval_min; 1974 connection->le_conn_interval_min = 0; 1975 hci_send_cmd(&hci_le_connection_update, connection->con_handle, connection_interval_min, 1976 connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout, 1977 0x0000, 0xffff); 1978 } 1979 #endif 1980 } 1981 1982 // send continuation fragments 1983 if (hci_stack->acl_fragmentation_total_size > 0) { 1984 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(hci_stack->hci_packet_buffer); 1985 if (hci_can_send_prepared_acl_packet_now(con_handle)){ 1986 hci_connection_t *connection = hci_connection_for_handle(con_handle); 1987 if (connection) { 1988 hci_send_acl_packet_fragments(connection); 1989 return; 1990 } 1991 // connection gone -> discard further fragments 1992 hci_stack->acl_fragmentation_total_size = 0; 1993 hci_stack->acl_fragmentation_pos = 0; 1994 } 1995 } 1996 1997 switch (hci_stack->state){ 1998 case HCI_STATE_INITIALIZING: 1999 hci_initializing_state_machine(); 2000 break; 2001 2002 case HCI_STATE_HALTING: 2003 2004 log_info("HCI_STATE_HALTING"); 2005 // close all open connections 2006 connection = (hci_connection_t *) hci_stack->connections; 2007 if (connection){ 2008 2009 // send disconnect 2010 if (!hci_can_send_command_packet_now()) return; 2011 2012 log_info("HCI_STATE_HALTING, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2013 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2014 2015 // send disconnected event right away - causes higher layer connections to get closed, too. 2016 hci_shutdown_connection(connection); 2017 return; 2018 } 2019 log_info("HCI_STATE_HALTING, calling off"); 2020 2021 // switch mode 2022 hci_power_control_off(); 2023 2024 log_info("HCI_STATE_HALTING, emitting state"); 2025 hci_emit_state(); 2026 log_info("HCI_STATE_HALTING, done"); 2027 break; 2028 2029 case HCI_STATE_FALLING_ASLEEP: 2030 switch(hci_stack->substate) { 2031 case 0: 2032 log_info("HCI_STATE_FALLING_ASLEEP"); 2033 // close all open connections 2034 connection = (hci_connection_t *) hci_stack->connections; 2035 2036 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2037 // don't close connections, if H4 supports power management 2038 if (bt_control_iphone_power_management_enabled()){ 2039 connection = NULL; 2040 } 2041 #endif 2042 if (connection){ 2043 2044 // send disconnect 2045 if (!hci_can_send_command_packet_now()) return; 2046 2047 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2048 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2049 2050 // send disconnected event right away - causes higher layer connections to get closed, too. 2051 hci_shutdown_connection(connection); 2052 return; 2053 } 2054 2055 if (hci_classic_supported()){ 2056 // disable page and inquiry scan 2057 if (!hci_can_send_command_packet_now()) return; 2058 2059 log_info("HCI_STATE_HALTING, disabling inq scans"); 2060 hci_send_cmd(&hci_write_scan_enable, hci_stack->connectable << 1); // drop inquiry scan but keep page scan 2061 2062 // continue in next sub state 2063 hci_stack->substate++; 2064 break; 2065 } 2066 // fall through for ble-only chips 2067 2068 case 2: 2069 log_info("HCI_STATE_HALTING, calling sleep"); 2070 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2071 // don't actually go to sleep, if H4 supports power management 2072 if (bt_control_iphone_power_management_enabled()){ 2073 // SLEEP MODE reached 2074 hci_stack->state = HCI_STATE_SLEEPING; 2075 hci_emit_state(); 2076 break; 2077 } 2078 #endif 2079 // switch mode 2080 hci_power_control_sleep(); // changes hci_stack->state to SLEEP 2081 hci_emit_state(); 2082 break; 2083 2084 default: 2085 break; 2086 } 2087 break; 2088 2089 default: 2090 break; 2091 } 2092 } 2093 2094 int hci_send_cmd_packet(uint8_t *packet, int size){ 2095 bd_addr_t addr; 2096 hci_connection_t * conn; 2097 // house-keeping 2098 2099 // create_connection? 2100 if (IS_COMMAND(packet, hci_create_connection)){ 2101 bt_flip_addr(addr, &packet[3]); 2102 log_info("Create_connection to %s", bd_addr_to_str(addr)); 2103 2104 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2105 if (!conn){ 2106 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2107 if (!conn){ 2108 // notify client that alloc failed 2109 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 2110 return 0; // don't sent packet to controller 2111 } 2112 conn->state = SEND_CREATE_CONNECTION; 2113 } 2114 log_info("conn state %u", conn->state); 2115 switch (conn->state){ 2116 // if connection active exists 2117 case OPEN: 2118 // and OPEN, emit connection complete command, don't send to controller 2119 hci_emit_connection_complete(conn, 0); 2120 return 0; 2121 case SEND_CREATE_CONNECTION: 2122 // connection created by hci, e.g. dedicated bonding 2123 break; 2124 default: 2125 // otherwise, just ignore as it is already in the open process 2126 return 0; 2127 } 2128 conn->state = SENT_CREATE_CONNECTION; 2129 } 2130 2131 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 2132 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 2133 } 2134 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 2135 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 2136 } 2137 2138 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 2139 if (hci_stack->remote_device_db){ 2140 bt_flip_addr(addr, &packet[3]); 2141 hci_stack->remote_device_db->delete_link_key(&addr); 2142 } 2143 } 2144 2145 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply) 2146 || IS_COMMAND(packet, hci_pin_code_request_reply)){ 2147 bt_flip_addr(addr, &packet[3]); 2148 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2149 if (conn){ 2150 connectionClearAuthenticationFlags(conn, LEGACY_PAIRING_ACTIVE); 2151 } 2152 } 2153 2154 if (IS_COMMAND(packet, hci_user_confirmation_request_negative_reply) 2155 || IS_COMMAND(packet, hci_user_confirmation_request_reply) 2156 || IS_COMMAND(packet, hci_user_passkey_request_negative_reply) 2157 || IS_COMMAND(packet, hci_user_passkey_request_reply)) { 2158 bt_flip_addr(addr, &packet[3]); 2159 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2160 if (conn){ 2161 connectionClearAuthenticationFlags(conn, SSP_PAIRING_ACTIVE); 2162 } 2163 } 2164 2165 #ifdef HAVE_BLE 2166 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 2167 hci_stack->adv_addr_type = packet[8]; 2168 } 2169 if (IS_COMMAND(packet, hci_le_set_random_address)){ 2170 bt_flip_addr(hci_stack->adv_address, &packet[3]); 2171 } 2172 #endif 2173 2174 hci_stack->num_cmd_packets--; 2175 2176 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, packet, size); 2177 int err = hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 2178 2179 // free packet buffer for synchronous transport implementations 2180 if (hci_transport_synchronous() && (packet == hci_stack->hci_packet_buffer)){ 2181 hci_stack->hci_packet_buffer_reserved = 0; 2182 } 2183 2184 return err; 2185 } 2186 2187 // disconnect because of security block 2188 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 2189 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2190 if (!connection) return; 2191 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 2192 } 2193 2194 2195 // Configure Secure Simple Pairing 2196 2197 // enable will enable SSP during init 2198 void hci_ssp_set_enable(int enable){ 2199 hci_stack->ssp_enable = enable; 2200 } 2201 2202 int hci_local_ssp_activated(){ 2203 return hci_ssp_supported() && hci_stack->ssp_enable; 2204 } 2205 2206 // if set, BTstack will respond to io capability request using authentication requirement 2207 void hci_ssp_set_io_capability(int io_capability){ 2208 hci_stack->ssp_io_capability = io_capability; 2209 } 2210 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 2211 hci_stack->ssp_authentication_requirement = authentication_requirement; 2212 } 2213 2214 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 2215 void hci_ssp_set_auto_accept(int auto_accept){ 2216 hci_stack->ssp_auto_accept = auto_accept; 2217 } 2218 2219 /** 2220 * pre: numcmds >= 0 - it's allowed to send a command to the controller 2221 */ 2222 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 2223 2224 if (!hci_can_send_command_packet_now()){ 2225 log_error("hci_send_cmd called but cannot send packet now"); 2226 return 0; 2227 } 2228 2229 // for HCI INITIALIZATION 2230 // log_info("hci_send_cmd: opcode %04x", cmd->opcode); 2231 hci_stack->last_cmd_opcode = cmd->opcode; 2232 2233 hci_reserve_packet_buffer(); 2234 uint8_t * packet = hci_stack->hci_packet_buffer; 2235 2236 va_list argptr; 2237 va_start(argptr, cmd); 2238 uint16_t size = hci_create_cmd_internal(packet, cmd, argptr); 2239 va_end(argptr); 2240 2241 return hci_send_cmd_packet(packet, size); 2242 } 2243 2244 // Create various non-HCI events. 2245 // TODO: generalize, use table similar to hci_create_command 2246 2247 void hci_emit_state(){ 2248 log_info("BTSTACK_EVENT_STATE %u", hci_stack->state); 2249 uint8_t event[3]; 2250 event[0] = BTSTACK_EVENT_STATE; 2251 event[1] = sizeof(event) - 2; 2252 event[2] = hci_stack->state; 2253 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2254 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2255 } 2256 2257 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 2258 uint8_t event[13]; 2259 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 2260 event[1] = sizeof(event) - 2; 2261 event[2] = status; 2262 bt_store_16(event, 3, conn->con_handle); 2263 bt_flip_addr(&event[5], conn->address); 2264 event[11] = 1; // ACL connection 2265 event[12] = 0; // encryption disabled 2266 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2267 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2268 } 2269 2270 void hci_emit_le_connection_complete(hci_connection_t *conn, uint8_t status){ 2271 uint8_t event[21]; 2272 event[0] = HCI_EVENT_LE_META; 2273 event[1] = sizeof(event) - 2; 2274 event[2] = HCI_SUBEVENT_LE_CONNECTION_COMPLETE; 2275 event[3] = status; 2276 bt_store_16(event, 4, conn->con_handle); 2277 event[6] = 0; // TODO: role 2278 event[7] = conn->address_type; 2279 bt_flip_addr(&event[8], conn->address); 2280 bt_store_16(event, 14, 0); // interval 2281 bt_store_16(event, 16, 0); // latency 2282 bt_store_16(event, 18, 0); // supervision timeout 2283 event[20] = 0; // master clock accuracy 2284 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2285 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2286 } 2287 2288 void hci_emit_disconnection_complete(uint16_t handle, uint8_t reason){ 2289 uint8_t event[6]; 2290 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 2291 event[1] = sizeof(event) - 2; 2292 event[2] = 0; // status = OK 2293 bt_store_16(event, 3, handle); 2294 event[5] = reason; 2295 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2296 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2297 } 2298 2299 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 2300 if (disable_l2cap_timeouts) return; 2301 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 2302 uint8_t event[4]; 2303 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 2304 event[1] = sizeof(event) - 2; 2305 bt_store_16(event, 2, conn->con_handle); 2306 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2307 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2308 } 2309 2310 void hci_emit_nr_connections_changed(){ 2311 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 2312 uint8_t event[3]; 2313 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 2314 event[1] = sizeof(event) - 2; 2315 event[2] = nr_hci_connections(); 2316 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2317 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2318 } 2319 2320 void hci_emit_hci_open_failed(){ 2321 log_info("BTSTACK_EVENT_POWERON_FAILED"); 2322 uint8_t event[2]; 2323 event[0] = BTSTACK_EVENT_POWERON_FAILED; 2324 event[1] = sizeof(event) - 2; 2325 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2326 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2327 } 2328 2329 #ifndef EMBEDDED 2330 void hci_emit_btstack_version() { 2331 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 2332 uint8_t event[6]; 2333 event[0] = BTSTACK_EVENT_VERSION; 2334 event[1] = sizeof(event) - 2; 2335 event[2] = BTSTACK_MAJOR; 2336 event[3] = BTSTACK_MINOR; 2337 bt_store_16(event, 4, BTSTACK_REVISION); 2338 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2339 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2340 } 2341 #endif 2342 2343 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 2344 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 2345 uint8_t event[3]; 2346 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 2347 event[1] = sizeof(event) - 2; 2348 event[2] = enabled; 2349 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2350 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2351 } 2352 2353 void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){ 2354 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 2355 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 2356 event[1] = sizeof(event) - 2 - 1; 2357 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 2358 bt_flip_addr(&event[3], *addr); 2359 memcpy(&event[9], name, 248); 2360 2361 event[9+248] = 0; // assert \0 for log_info 2362 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(*addr), &event[9]); 2363 2364 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 2365 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 2366 } 2367 2368 void hci_emit_discoverable_enabled(uint8_t enabled){ 2369 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 2370 uint8_t event[3]; 2371 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 2372 event[1] = sizeof(event) - 2; 2373 event[2] = enabled; 2374 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2375 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2376 } 2377 2378 void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){ 2379 log_info("hci_emit_security_level %u for handle %x", level, con_handle); 2380 uint8_t event[5]; 2381 int pos = 0; 2382 event[pos++] = GAP_SECURITY_LEVEL; 2383 event[pos++] = sizeof(event) - 2; 2384 bt_store_16(event, 2, con_handle); 2385 pos += 2; 2386 event[pos++] = level; 2387 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2388 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2389 } 2390 2391 void hci_emit_dedicated_bonding_result(bd_addr_t address, uint8_t status){ 2392 log_info("hci_emit_dedicated_bonding_result %u ", status); 2393 uint8_t event[9]; 2394 int pos = 0; 2395 event[pos++] = GAP_DEDICATED_BONDING_COMPLETED; 2396 event[pos++] = sizeof(event) - 2; 2397 event[pos++] = status; 2398 bt_flip_addr( * (bd_addr_t *) &event[pos], address); 2399 pos += 6; 2400 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2401 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2402 } 2403 2404 // query if remote side supports SSP 2405 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 2406 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2407 if (!connection) return 0; 2408 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 2409 } 2410 2411 int hci_ssp_supported_on_both_sides(hci_con_handle_t handle){ 2412 return hci_local_ssp_activated() && hci_remote_ssp_supported(handle); 2413 } 2414 2415 // GAP API 2416 /** 2417 * @bbrief enable/disable bonding. default is enabled 2418 * @praram enabled 2419 */ 2420 void gap_set_bondable_mode(int enable){ 2421 hci_stack->bondable = enable ? 1 : 0; 2422 } 2423 2424 /** 2425 * @brief map link keys to security levels 2426 */ 2427 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 2428 switch (link_key_type){ 2429 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 2430 return LEVEL_4; 2431 case COMBINATION_KEY: 2432 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 2433 return LEVEL_3; 2434 default: 2435 return LEVEL_2; 2436 } 2437 } 2438 2439 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 2440 if (!connection) return LEVEL_0; 2441 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 2442 return gap_security_level_for_link_key_type(connection->link_key_type); 2443 } 2444 2445 2446 int gap_mitm_protection_required_for_security_level(gap_security_level_t level){ 2447 log_info("gap_mitm_protection_required_for_security_level %u", level); 2448 return level > LEVEL_2; 2449 } 2450 2451 /** 2452 * @brief get current security level 2453 */ 2454 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 2455 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2456 if (!connection) return LEVEL_0; 2457 return gap_security_level_for_connection(connection); 2458 } 2459 2460 /** 2461 * @brief request connection to device to 2462 * @result GAP_AUTHENTICATION_RESULT 2463 */ 2464 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 2465 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2466 if (!connection){ 2467 hci_emit_security_level(con_handle, LEVEL_0); 2468 return; 2469 } 2470 gap_security_level_t current_level = gap_security_level(con_handle); 2471 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 2472 if (current_level >= requested_level){ 2473 hci_emit_security_level(con_handle, current_level); 2474 return; 2475 } 2476 2477 connection->requested_security_level = requested_level; 2478 2479 // would enabling ecnryption suffice (>= LEVEL_2)? 2480 if (hci_stack->remote_device_db){ 2481 link_key_type_t link_key_type; 2482 link_key_t link_key; 2483 if (hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type)){ 2484 if (gap_security_level_for_link_key_type(link_key_type) >= requested_level){ 2485 connection->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 2486 return; 2487 } 2488 } 2489 } 2490 2491 // try to authenticate connection 2492 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 2493 hci_run(); 2494 } 2495 2496 /** 2497 * @brief start dedicated bonding with device. disconnect after bonding 2498 * @param device 2499 * @param request MITM protection 2500 * @result GAP_DEDICATED_BONDING_COMPLETE 2501 */ 2502 int gap_dedicated_bonding(bd_addr_t device, int mitm_protection_required){ 2503 2504 // create connection state machine 2505 hci_connection_t * connection = create_connection_for_bd_addr_and_type(device, BD_ADDR_TYPE_CLASSIC); 2506 2507 if (!connection){ 2508 return BTSTACK_MEMORY_ALLOC_FAILED; 2509 } 2510 2511 // delete linkn key 2512 hci_drop_link_key_for_bd_addr( (bd_addr_t *) &device); 2513 2514 // configure LEVEL_2/3, dedicated bonding 2515 connection->state = SEND_CREATE_CONNECTION; 2516 connection->requested_security_level = mitm_protection_required ? LEVEL_3 : LEVEL_2; 2517 log_info("gap_dedicated_bonding, mitm %u -> level %u", mitm_protection_required, connection->requested_security_level); 2518 connection->bonding_flags = BONDING_DEDICATED; 2519 2520 // wait for GAP Security Result and send GAP Dedicated Bonding complete 2521 2522 // handle: connnection failure (connection complete != ok) 2523 // handle: authentication failure 2524 // handle: disconnect on done 2525 2526 hci_run(); 2527 2528 return 0; 2529 } 2530 2531 void gap_set_local_name(const char * local_name){ 2532 hci_stack->local_name = local_name; 2533 } 2534 2535 le_command_status_t le_central_start_scan(){ 2536 if (hci_stack->le_scanning_state == LE_SCANNING) return BLE_PERIPHERAL_OK; 2537 hci_stack->le_scanning_state = LE_START_SCAN; 2538 hci_run(); 2539 return BLE_PERIPHERAL_OK; 2540 } 2541 2542 le_command_status_t le_central_stop_scan(){ 2543 if ( hci_stack->le_scanning_state == LE_SCAN_IDLE) return BLE_PERIPHERAL_OK; 2544 hci_stack->le_scanning_state = LE_STOP_SCAN; 2545 hci_run(); 2546 return BLE_PERIPHERAL_OK; 2547 } 2548 2549 void le_central_set_scan_parameters(uint8_t scan_type, uint16_t scan_interval, uint16_t scan_window){ 2550 hci_stack->le_scan_type = scan_type; 2551 hci_stack->le_scan_interval = scan_interval; 2552 hci_stack->le_scan_window = scan_window; 2553 hci_run(); 2554 } 2555 2556 le_command_status_t le_central_connect(bd_addr_t * addr, bd_addr_type_t addr_type){ 2557 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 2558 if (!conn){ 2559 log_info("le_central_connect: no connection exists yet, creating context"); 2560 conn = create_connection_for_bd_addr_and_type(*addr, addr_type); 2561 if (!conn){ 2562 // notify client that alloc failed 2563 hci_emit_le_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 2564 log_info("le_central_connect: failed to alloc context"); 2565 return BLE_PERIPHERAL_NOT_CONNECTED; // don't sent packet to controller 2566 } 2567 conn->state = SEND_CREATE_CONNECTION; 2568 log_info("le_central_connect: send create connection next"); 2569 hci_run(); 2570 return BLE_PERIPHERAL_OK; 2571 } 2572 2573 if (!hci_is_le_connection(conn) || 2574 conn->state == SEND_CREATE_CONNECTION || 2575 conn->state == SENT_CREATE_CONNECTION) { 2576 hci_emit_le_connection_complete(conn, ERROR_CODE_COMMAND_DISALLOWED); 2577 log_error("le_central_connect: classic connection or connect is already being created"); 2578 return BLE_PERIPHERAL_IN_WRONG_STATE; 2579 } 2580 2581 log_info("le_central_connect: context exists with state %u", conn->state); 2582 hci_emit_le_connection_complete(conn, 0); 2583 hci_run(); 2584 return BLE_PERIPHERAL_OK; 2585 } 2586 2587 // @assumption: only a single outgoing LE Connection exists 2588 static hci_connection_t * le_central_get_outgoing_connection(){ 2589 linked_item_t *it; 2590 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 2591 hci_connection_t * conn = (hci_connection_t *) it; 2592 if (!hci_is_le_connection(conn)) continue; 2593 switch (conn->state){ 2594 case SEND_CREATE_CONNECTION: 2595 case SENT_CREATE_CONNECTION: 2596 return conn; 2597 default: 2598 break; 2599 }; 2600 } 2601 return NULL; 2602 } 2603 2604 le_command_status_t le_central_connect_cancel(){ 2605 hci_connection_t * conn = le_central_get_outgoing_connection(); 2606 switch (conn->state){ 2607 case SEND_CREATE_CONNECTION: 2608 // skip sending create connection and emit event instead 2609 hci_emit_le_connection_complete(conn, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 2610 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 2611 btstack_memory_hci_connection_free( conn ); 2612 break; 2613 case SENT_CREATE_CONNECTION: 2614 // request to send cancel connection 2615 conn->state = SEND_CANCEL_CONNECTION; 2616 hci_run(); 2617 break; 2618 default: 2619 break; 2620 } 2621 return BLE_PERIPHERAL_OK; 2622 } 2623 2624 /** 2625 * @brief Updates the connection parameters for a given LE connection 2626 * @param handle 2627 * @param conn_interval_min (unit: 1.25ms) 2628 * @param conn_interval_max (unit: 1.25ms) 2629 * @param conn_latency 2630 * @param supervision_timeout (unit: 10ms) 2631 * @returns 0 if ok 2632 */ 2633 int gap_update_connection_parameters(hci_con_handle_t con_handle, uint16_t conn_interval_min, 2634 uint16_t conn_interval_max, uint16_t conn_latency, uint16_t supervision_timeout){ 2635 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2636 if (!connection) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2637 connection->le_conn_interval_min = conn_interval_min; 2638 connection->le_conn_interval_max = conn_interval_max; 2639 connection->le_conn_latency = conn_latency; 2640 connection->le_supervision_timeout = supervision_timeout; 2641 return 0; 2642 } 2643 2644 le_command_status_t gap_disconnect(hci_con_handle_t handle){ 2645 hci_connection_t * conn = hci_connection_for_handle(handle); 2646 if (!conn){ 2647 hci_emit_disconnection_complete(handle, 0); 2648 return BLE_PERIPHERAL_OK; 2649 } 2650 conn->state = SEND_DISCONNECT; 2651 hci_run(); 2652 return BLE_PERIPHERAL_OK; 2653 } 2654 2655 void hci_disconnect_all(){ 2656 linked_list_iterator_t it; 2657 linked_list_iterator_init(&it, &hci_stack->connections); 2658 while (linked_list_iterator_has_next(&it)){ 2659 hci_connection_t * con = (hci_connection_t*) linked_list_iterator_next(&it); 2660 if (con->state == SENT_DISCONNECT) continue; 2661 con->state = SEND_DISCONNECT; 2662 } 2663 hci_run(); 2664 } 2665