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 log_info("create_connection_for_addr %s", bd_addr_to_str(addr)); 101 hci_connection_t * conn = btstack_memory_hci_connection_get(); 102 if (!conn) return NULL; 103 BD_ADDR_COPY(conn->address, addr); 104 conn->address_type = addr_type; 105 conn->con_handle = 0xffff; 106 conn->authentication_flags = AUTH_FLAGS_NONE; 107 conn->bonding_flags = 0; 108 conn->requested_security_level = LEVEL_0; 109 linked_item_set_user(&conn->timeout.item, conn); 110 conn->timeout.process = hci_connection_timeout_handler; 111 hci_connection_timestamp(conn); 112 conn->acl_recombination_length = 0; 113 conn->acl_recombination_pos = 0; 114 conn->num_acl_packets_sent = 0; 115 conn->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 116 linked_list_add(&hci_stack->connections, (linked_item_t *) conn); 117 return conn; 118 } 119 120 121 /** 122 * get le connection parameter range 123 * 124 * @return le connection parameter range struct 125 */ 126 le_connection_parameter_range_t gap_le_get_connection_parameter_range(){ 127 return hci_stack->le_connection_parameter_range; 128 } 129 130 /** 131 * set le connection parameter range 132 * 133 */ 134 135 void gap_le_set_connection_parameter_range(le_connection_parameter_range_t range){ 136 hci_stack->le_connection_parameter_range.le_conn_interval_min = range.le_conn_interval_min; 137 hci_stack->le_connection_parameter_range.le_conn_interval_max = range.le_conn_interval_max; 138 hci_stack->le_connection_parameter_range.le_conn_interval_min = range.le_conn_latency_min; 139 hci_stack->le_connection_parameter_range.le_conn_interval_max = range.le_conn_latency_max; 140 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = range.le_supervision_timeout_min; 141 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = range.le_supervision_timeout_max; 142 } 143 144 /** 145 * get hci connections iterator 146 * 147 * @return hci connections iterator 148 */ 149 150 void hci_connections_get_iterator(linked_list_iterator_t *it){ 151 linked_list_iterator_init(it, &hci_stack->connections); 152 } 153 154 /** 155 * get connection for a given handle 156 * 157 * @return connection OR NULL, if not found 158 */ 159 hci_connection_t * hci_connection_for_handle(hci_con_handle_t con_handle){ 160 linked_list_iterator_t it; 161 linked_list_iterator_init(&it, &hci_stack->connections); 162 while (linked_list_iterator_has_next(&it)){ 163 hci_connection_t * item = (hci_connection_t *) linked_list_iterator_next(&it); 164 if ( item->con_handle == con_handle ) { 165 return item; 166 } 167 } 168 return NULL; 169 } 170 171 /** 172 * get connection for given address 173 * 174 * @return connection OR NULL, if not found 175 */ 176 hci_connection_t * hci_connection_for_bd_addr_and_type(bd_addr_t * addr, bd_addr_type_t addr_type){ 177 linked_list_iterator_t it; 178 linked_list_iterator_init(&it, &hci_stack->connections); 179 while (linked_list_iterator_has_next(&it)){ 180 hci_connection_t * connection = (hci_connection_t *) linked_list_iterator_next(&it); 181 if (connection->address_type != addr_type) continue; 182 if (memcmp(addr, connection->address, 6) != 0) continue; 183 return connection; 184 } 185 return NULL; 186 } 187 188 static void hci_connection_timeout_handler(timer_source_t *timer){ 189 hci_connection_t * connection = (hci_connection_t *) linked_item_get_user(&timer->item); 190 #ifdef HAVE_TIME 191 struct timeval tv; 192 gettimeofday(&tv, NULL); 193 if (tv.tv_sec >= connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000) { 194 // connections might be timed out 195 hci_emit_l2cap_check_timeout(connection); 196 } 197 #endif 198 #ifdef HAVE_TICK 199 if (embedded_get_ticks() > connection->timestamp + embedded_ticks_for_ms(HCI_CONNECTION_TIMEOUT_MS)){ 200 // connections might be timed out 201 hci_emit_l2cap_check_timeout(connection); 202 } 203 #endif 204 run_loop_set_timer(timer, HCI_CONNECTION_TIMEOUT_MS); 205 run_loop_add_timer(timer); 206 } 207 208 static void hci_connection_timestamp(hci_connection_t *connection){ 209 #ifdef HAVE_TIME 210 gettimeofday(&connection->timestamp, NULL); 211 #endif 212 #ifdef HAVE_TICK 213 connection->timestamp = embedded_get_ticks(); 214 #endif 215 } 216 217 218 inline static void connectionSetAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 219 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags | flags); 220 } 221 222 inline static void connectionClearAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 223 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags & ~flags); 224 } 225 226 227 /** 228 * add authentication flags and reset timer 229 * @note: assumes classic connection 230 */ 231 static void hci_add_connection_flags_for_flipped_bd_addr(uint8_t *bd_addr, hci_authentication_flags_t flags){ 232 bd_addr_t addr; 233 bt_flip_addr(addr, *(bd_addr_t *) bd_addr); 234 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 235 if (conn) { 236 connectionSetAuthenticationFlags(conn, flags); 237 hci_connection_timestamp(conn); 238 } 239 } 240 241 int hci_authentication_active_for_handle(hci_con_handle_t handle){ 242 hci_connection_t * conn = hci_connection_for_handle(handle); 243 if (!conn) return 0; 244 if (conn->authentication_flags & LEGACY_PAIRING_ACTIVE) return 1; 245 if (conn->authentication_flags & SSP_PAIRING_ACTIVE) return 1; 246 return 0; 247 } 248 249 void hci_drop_link_key_for_bd_addr(bd_addr_t *addr){ 250 if (hci_stack->remote_device_db) { 251 hci_stack->remote_device_db->delete_link_key(addr); 252 } 253 } 254 255 int hci_is_le_connection(hci_connection_t * connection){ 256 return connection->address_type == BD_ADDR_TYPE_LE_PUBLIC || 257 connection->address_type == BD_ADDR_TYPE_LE_RANDOM; 258 } 259 260 261 /** 262 * count connections 263 */ 264 static int nr_hci_connections(void){ 265 int count = 0; 266 linked_item_t *it; 267 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next, count++); 268 return count; 269 } 270 271 /** 272 * Dummy handler called by HCI 273 */ 274 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 275 } 276 277 uint8_t hci_number_outgoing_packets(hci_con_handle_t handle){ 278 hci_connection_t * connection = hci_connection_for_handle(handle); 279 if (!connection) { 280 log_error("hci_number_outgoing_packets: connection for handle %u does not exist!", handle); 281 return 0; 282 } 283 return connection->num_acl_packets_sent; 284 } 285 286 uint8_t hci_number_free_acl_slots_for_handle(hci_con_handle_t con_handle){ 287 288 int num_packets_sent_classic = 0; 289 int num_packets_sent_le = 0; 290 291 bd_addr_type_t address_type = BD_ADDR_TYPE_UNKNOWN; 292 293 linked_item_t *it; 294 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 295 hci_connection_t * connection = (hci_connection_t *) it; 296 if (connection->address_type == BD_ADDR_TYPE_CLASSIC){ 297 num_packets_sent_classic += connection->num_acl_packets_sent; 298 } else { 299 num_packets_sent_le += connection->num_acl_packets_sent; 300 } 301 if (connection->con_handle == con_handle){ 302 address_type = connection->address_type; 303 } 304 } 305 306 int free_slots_classic = hci_stack->acl_packets_total_num - num_packets_sent_classic; 307 int free_slots_le = 0; 308 309 if (free_slots_classic < 0){ 310 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); 311 return 0; 312 } 313 314 if (hci_stack->le_acl_packets_total_num){ 315 // if we have LE slots, they are used 316 free_slots_le = hci_stack->le_acl_packets_total_num - num_packets_sent_le; 317 if (free_slots_le < 0){ 318 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); 319 return 0; 320 } 321 } else { 322 // otherwise, classic slots are used for LE, too 323 free_slots_classic -= num_packets_sent_le; 324 if (free_slots_classic < 0){ 325 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); 326 return 0; 327 } 328 } 329 330 switch (address_type){ 331 case BD_ADDR_TYPE_UNKNOWN: 332 log_error("hci_number_free_acl_slots: handle 0x%04x not in connection list", con_handle); 333 return 0; 334 335 case BD_ADDR_TYPE_CLASSIC: 336 return free_slots_classic; 337 338 default: 339 if (hci_stack->le_acl_packets_total_num){ 340 return free_slots_le; 341 } 342 return free_slots_classic; 343 } 344 } 345 346 347 // @deprecated 348 int hci_can_send_packet_now(uint8_t packet_type){ 349 switch (packet_type) { 350 case HCI_ACL_DATA_PACKET: 351 return hci_can_send_prepared_acl_packet_now(0); 352 case HCI_COMMAND_DATA_PACKET: 353 return hci_can_send_command_packet_now(); 354 default: 355 return 0; 356 } 357 } 358 359 // @deprecated 360 // same as hci_can_send_packet_now, but also checks if packet buffer is free for use 361 int hci_can_send_packet_now_using_packet_buffer(uint8_t packet_type){ 362 363 if (hci_stack->hci_packet_buffer_reserved) return 0; 364 365 switch (packet_type) { 366 case HCI_ACL_DATA_PACKET: 367 return hci_can_send_acl_packet_now(0); 368 case HCI_COMMAND_DATA_PACKET: 369 return hci_can_send_command_packet_now(); 370 default: 371 return 0; 372 } 373 } 374 375 376 // new functions replacing hci_can_send_packet_now[_using_packet_buffer] 377 int hci_can_send_command_packet_now(void){ 378 if (hci_stack->hci_packet_buffer_reserved) return 0; 379 380 // check for async hci transport implementations 381 if (hci_stack->hci_transport->can_send_packet_now){ 382 if (!hci_stack->hci_transport->can_send_packet_now(HCI_COMMAND_DATA_PACKET)){ 383 return 0; 384 } 385 } 386 387 return hci_stack->num_cmd_packets > 0; 388 } 389 390 int hci_can_send_prepared_acl_packet_now(hci_con_handle_t con_handle) { 391 // check for async hci transport implementations 392 if (hci_stack->hci_transport->can_send_packet_now){ 393 if (!hci_stack->hci_transport->can_send_packet_now(HCI_ACL_DATA_PACKET)){ 394 return 0; 395 } 396 } 397 return hci_number_free_acl_slots_for_handle(con_handle) > 0; 398 } 399 400 int hci_can_send_acl_packet_now(hci_con_handle_t con_handle){ 401 if (hci_stack->hci_packet_buffer_reserved) return 0; 402 return hci_can_send_prepared_acl_packet_now(con_handle); 403 } 404 405 // used for internal checks in l2cap[-le].c 406 int hci_is_packet_buffer_reserved(void){ 407 return hci_stack->hci_packet_buffer_reserved; 408 } 409 410 // reserves outgoing packet buffer. @returns 1 if successful 411 int hci_reserve_packet_buffer(void){ 412 if (hci_stack->hci_packet_buffer_reserved) { 413 log_error("hci_reserve_packet_buffer called but buffer already reserved"); 414 return 0; 415 } 416 hci_stack->hci_packet_buffer_reserved = 1; 417 return 1; 418 } 419 420 void hci_release_packet_buffer(void){ 421 hci_stack->hci_packet_buffer_reserved = 0; 422 } 423 424 // assumption: synchronous implementations don't provide can_send_packet_now as they don't keep the buffer after the call 425 int hci_transport_synchronous(void){ 426 return hci_stack->hci_transport->can_send_packet_now == NULL; 427 } 428 429 uint16_t hci_max_acl_le_data_packet_length(void){ 430 return hci_stack->le_data_packets_length > 0 ? hci_stack->le_data_packets_length : hci_stack->acl_data_packet_length; 431 } 432 433 static int hci_send_acl_packet_fragments(hci_connection_t *connection){ 434 435 // 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); 436 437 // max ACL data packet length depends on connection type (LE vs. Classic) and available buffers 438 uint16_t max_acl_data_packet_length = hci_stack->acl_data_packet_length; 439 if (hci_is_le_connection(connection) && hci_stack->le_data_packets_length > 0){ 440 max_acl_data_packet_length = hci_stack->le_data_packets_length; 441 } 442 443 // testing: reduce buffer to minimum 444 // max_acl_data_packet_length = 52; 445 446 int err; 447 // multiple packets could be send on a synchronous HCI transport 448 while (1){ 449 450 // get current data 451 const uint16_t acl_header_pos = hci_stack->acl_fragmentation_pos - 4; 452 int current_acl_data_packet_length = hci_stack->acl_fragmentation_total_size - hci_stack->acl_fragmentation_pos; 453 int more_fragments = 0; 454 455 // if ACL packet is larger than Bluetooth packet buffer, only send max_acl_data_packet_length 456 if (current_acl_data_packet_length > max_acl_data_packet_length){ 457 more_fragments = 1; 458 current_acl_data_packet_length = max_acl_data_packet_length; 459 } 460 461 // copy handle_and_flags if not first fragment and update packet boundary flags to be 01 (continuing fragmnent) 462 if (acl_header_pos > 0){ 463 uint16_t handle_and_flags = READ_BT_16(hci_stack->hci_packet_buffer, 0); 464 handle_and_flags = (handle_and_flags & 0xcfff) | (1 << 12); 465 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos, handle_and_flags); 466 } 467 468 // update header len 469 bt_store_16(hci_stack->hci_packet_buffer, acl_header_pos + 2, current_acl_data_packet_length); 470 471 // count packet 472 connection->num_acl_packets_sent++; 473 474 // send packet 475 uint8_t * packet = &hci_stack->hci_packet_buffer[acl_header_pos]; 476 const int size = current_acl_data_packet_length + 4; 477 hci_dump_packet(HCI_ACL_DATA_PACKET, 0, packet, size); 478 err = hci_stack->hci_transport->send_packet(HCI_ACL_DATA_PACKET, packet, size); 479 480 // done yet? 481 if (!more_fragments) break; 482 483 // update start of next fragment to send 484 hci_stack->acl_fragmentation_pos += current_acl_data_packet_length; 485 486 // can send more? 487 if (!hci_can_send_prepared_acl_packet_now(connection->con_handle)) return err; 488 } 489 490 // done 491 hci_stack->acl_fragmentation_pos = 0; 492 hci_stack->acl_fragmentation_total_size = 0; 493 494 // release buffer now for synchronous transport 495 if (hci_transport_synchronous()){ 496 hci_release_packet_buffer(); 497 } 498 499 return err; 500 } 501 502 // pre: caller has reserved the packet buffer 503 int hci_send_acl_packet_buffer(int size){ 504 505 // log_info("hci_send_acl_packet_buffer size %u", size); 506 507 if (!hci_stack->hci_packet_buffer_reserved) { 508 log_error("hci_send_acl_packet_buffer called without reserving packet buffer"); 509 return 0; 510 } 511 512 uint8_t * packet = hci_stack->hci_packet_buffer; 513 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 514 515 // check for free places on Bluetooth module 516 if (!hci_can_send_prepared_acl_packet_now(con_handle)) { 517 log_error("hci_send_acl_packet_buffer called but no free ACL buffers on controller"); 518 hci_release_packet_buffer(); 519 return BTSTACK_ACL_BUFFERS_FULL; 520 } 521 522 hci_connection_t *connection = hci_connection_for_handle( con_handle); 523 if (!connection) { 524 log_error("hci_send_acl_packet_buffer called but no connection for handle 0x%04x", con_handle); 525 hci_release_packet_buffer(); 526 return 0; 527 } 528 hci_connection_timestamp(connection); 529 530 // hci_dump_packet( HCI_ACL_DATA_PACKET, 0, packet, size); 531 532 // setup data 533 hci_stack->acl_fragmentation_total_size = size; 534 hci_stack->acl_fragmentation_pos = 4; // start of L2CAP packet 535 536 return hci_send_acl_packet_fragments(connection); 537 } 538 539 static void acl_handler(uint8_t *packet, int size){ 540 541 // log_info("acl_handler: size %u", size); 542 543 // get info 544 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 545 hci_connection_t *conn = hci_connection_for_handle(con_handle); 546 uint8_t acl_flags = READ_ACL_FLAGS(packet); 547 uint16_t acl_length = READ_ACL_LENGTH(packet); 548 549 // ignore non-registered handle 550 if (!conn){ 551 log_error( "hci.c: acl_handler called with non-registered handle %u!" , con_handle); 552 return; 553 } 554 555 // assert packet is complete 556 if (acl_length + 4 != size){ 557 log_error("hci.c: acl_handler called with ACL packet of wrong size %u, expected %u => dropping packet", size, acl_length + 4); 558 return; 559 } 560 561 // update idle timestamp 562 hci_connection_timestamp(conn); 563 564 // handle different packet types 565 switch (acl_flags & 0x03) { 566 567 case 0x01: // continuation fragment 568 569 // sanity checks 570 if (conn->acl_recombination_pos == 0) { 571 log_error( "ACL Cont Fragment but no first fragment for handle 0x%02x", con_handle); 572 return; 573 } 574 if (conn->acl_recombination_pos + acl_length > 4 + HCI_ACL_BUFFER_SIZE){ 575 log_error( "ACL Cont Fragment to large: combined packet %u > buffer size %u for handle 0x%02x", 576 conn->acl_recombination_pos + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle); 577 conn->acl_recombination_pos = 0; 578 return; 579 } 580 581 // append fragment payload (header already stored) 582 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE + conn->acl_recombination_pos], &packet[4], acl_length ); 583 conn->acl_recombination_pos += acl_length; 584 585 // log_error( "ACL Cont Fragment: acl_len %u, combined_len %u, l2cap_len %u", acl_length, 586 // conn->acl_recombination_pos, conn->acl_recombination_length); 587 588 // forward complete L2CAP packet if complete. 589 if (conn->acl_recombination_pos >= conn->acl_recombination_length + 4 + 4){ // pos already incl. ACL header 590 591 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, &conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], conn->acl_recombination_pos); 592 // reset recombination buffer 593 conn->acl_recombination_length = 0; 594 conn->acl_recombination_pos = 0; 595 } 596 break; 597 598 case 0x02: { // first fragment 599 600 // sanity check 601 if (conn->acl_recombination_pos) { 602 log_error( "ACL First Fragment but data in buffer for handle 0x%02x, dropping stale fragments", con_handle); 603 conn->acl_recombination_pos = 0; 604 } 605 606 // peek into L2CAP packet! 607 uint16_t l2cap_length = READ_L2CAP_LENGTH( packet ); 608 609 // log_info( "ACL First Fragment: acl_len %u, l2cap_len %u", acl_length, l2cap_length); 610 611 // compare fragment size to L2CAP packet size 612 if (acl_length >= l2cap_length + 4){ 613 614 // forward fragment as L2CAP packet 615 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, packet, acl_length + 4); 616 617 } else { 618 619 if (acl_length > HCI_ACL_BUFFER_SIZE){ 620 log_error( "ACL First Fragment to large: fragment %u > buffer size %u for handle 0x%02x", 621 4 + acl_length, 4 + HCI_ACL_BUFFER_SIZE, con_handle); 622 return; 623 } 624 625 // store first fragment and tweak acl length for complete package 626 memcpy(&conn->acl_recombination_buffer[HCI_INCOMING_PRE_BUFFER_SIZE], packet, acl_length + 4); 627 conn->acl_recombination_pos = acl_length + 4; 628 conn->acl_recombination_length = l2cap_length; 629 bt_store_16(conn->acl_recombination_buffer, HCI_INCOMING_PRE_BUFFER_SIZE + 2, l2cap_length +4); 630 } 631 break; 632 633 } 634 default: 635 log_error( "hci.c: acl_handler called with invalid packet boundary flags %u", acl_flags & 0x03); 636 return; 637 } 638 639 // execute main loop 640 hci_run(); 641 } 642 643 static void hci_shutdown_connection(hci_connection_t *conn){ 644 log_info("Connection closed: handle 0x%x, %s", conn->con_handle, bd_addr_to_str(conn->address)); 645 646 run_loop_remove_timer(&conn->timeout); 647 648 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 649 btstack_memory_hci_connection_free( conn ); 650 651 // now it's gone 652 hci_emit_nr_connections_changed(); 653 } 654 655 static const uint16_t packet_type_sizes[] = { 656 0, HCI_ACL_2DH1_SIZE, HCI_ACL_3DH1_SIZE, HCI_ACL_DM1_SIZE, 657 HCI_ACL_DH1_SIZE, 0, 0, 0, 658 HCI_ACL_2DH3_SIZE, HCI_ACL_3DH3_SIZE, HCI_ACL_DM3_SIZE, HCI_ACL_DH3_SIZE, 659 HCI_ACL_2DH5_SIZE, HCI_ACL_3DH5_SIZE, HCI_ACL_DM5_SIZE, HCI_ACL_DH5_SIZE 660 }; 661 static const uint8_t packet_type_feature_requirement_bit[] = { 662 0, // 3 slot packets 663 1, // 5 slot packets 664 25, // EDR 2 mpbs 665 26, // EDR 3 mbps 666 39, // 3 slot EDR packts 667 40, // 5 slot EDR packet 668 }; 669 static const uint16_t packet_type_feature_packet_mask[] = { 670 0x0f00, // 3 slot packets 671 0xf000, // 5 slot packets 672 0x1102, // EDR 2 mpbs 673 0x2204, // EDR 3 mbps 674 0x0300, // 3 slot EDR packts 675 0x3000, // 5 slot EDR packet 676 }; 677 678 static uint16_t hci_acl_packet_types_for_buffer_size_and_local_features(uint16_t buffer_size, uint8_t * local_supported_features){ 679 // enable packet types based on size 680 uint16_t packet_types = 0; 681 unsigned int i; 682 for (i=0;i<16;i++){ 683 if (packet_type_sizes[i] == 0) continue; 684 if (packet_type_sizes[i] <= buffer_size){ 685 packet_types |= 1 << i; 686 } 687 } 688 // disable packet types due to missing local supported features 689 for (i=0;i<sizeof(packet_type_feature_requirement_bit);i++){ 690 int bit_idx = packet_type_feature_requirement_bit[i]; 691 int feature_set = (local_supported_features[bit_idx >> 3] & (1<<(bit_idx & 7))) != 0; 692 if (feature_set) continue; 693 log_info("Features bit %02u is not set, removing packet types 0x%04x", bit_idx, packet_type_feature_packet_mask[i]); 694 packet_types &= ~packet_type_feature_packet_mask[i]; 695 } 696 // flip bits for "may not be used" 697 packet_types ^= 0x3306; 698 return packet_types; 699 } 700 701 uint16_t hci_usable_acl_packet_types(void){ 702 return hci_stack->packet_types; 703 } 704 705 uint8_t* hci_get_outgoing_packet_buffer(void){ 706 // hci packet buffer is >= acl data packet length 707 return hci_stack->hci_packet_buffer; 708 } 709 710 uint16_t hci_max_acl_data_packet_length(void){ 711 return hci_stack->acl_data_packet_length; 712 } 713 714 int hci_non_flushable_packet_boundary_flag_supported(void){ 715 // No. 54, byte 6, bit 6 716 return (hci_stack->local_supported_features[6] & (1 << 6)) != 0; 717 } 718 719 int hci_ssp_supported(void){ 720 // No. 51, byte 6, bit 3 721 return (hci_stack->local_supported_features[6] & (1 << 3)) != 0; 722 } 723 724 int hci_classic_supported(void){ 725 // No. 37, byte 4, bit 5, = No BR/EDR Support 726 return (hci_stack->local_supported_features[4] & (1 << 5)) == 0; 727 } 728 729 int hci_le_supported(void){ 730 #ifdef HAVE_BLE 731 // No. 37, byte 4, bit 6 = LE Supported (Controller) 732 return (hci_stack->local_supported_features[4] & (1 << 6)) != 0; 733 #else 734 return 0; 735 #endif 736 } 737 738 // get addr type and address used in advertisement packets 739 void hci_le_advertisement_address(uint8_t * addr_type, bd_addr_t * addr){ 740 *addr_type = hci_stack->adv_addr_type; 741 if (hci_stack->adv_addr_type){ 742 memcpy(addr, hci_stack->adv_address, 6); 743 } else { 744 memcpy(addr, hci_stack->local_bd_addr, 6); 745 } 746 } 747 748 #ifdef HAVE_BLE 749 void le_handle_advertisement_report(uint8_t *packet, int size){ 750 int offset = 3; 751 int num_reports = packet[offset]; 752 offset += 1; 753 754 int i; 755 log_info("HCI: handle adv report with num reports: %d", num_reports); 756 for (i=0; i<num_reports;i++){ 757 uint8_t data_length = packet[offset + 8]; 758 uint8_t event_size = 10 + data_length; 759 uint8_t event[2 + event_size ]; 760 int pos = 0; 761 event[pos++] = GAP_LE_ADVERTISING_REPORT; 762 event[pos++] = event_size; 763 memcpy(&event[pos], &packet[offset], 1+1+6); // event type + address type + address 764 offset += 8; 765 pos += 8; 766 event[pos++] = packet[offset + 1 + data_length]; // rssi 767 event[pos++] = packet[offset++]; //data_length; 768 memcpy(&event[pos], &packet[offset], data_length); 769 pos += data_length; 770 offset += data_length + 1; // rssi 771 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 772 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 773 } 774 } 775 #endif 776 777 static void hci_initializing_event_handler(uint8_t * packet, uint16_t size){ 778 uint8_t command_completed = 0; 779 if ((hci_stack->substate % 2) == 0) return; 780 // odd: waiting for event 781 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 782 uint16_t opcode = READ_BT_16(packet,3); 783 if (opcode == hci_stack->last_cmd_opcode){ 784 command_completed = 1; 785 log_info("Command complete for expected opcode %04x -> new substate %u", opcode, hci_stack->substate); 786 } else { 787 log_info("Command complete for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 788 } 789 } 790 if (packet[0] == HCI_EVENT_COMMAND_STATUS){ 791 uint8_t status = packet[2]; 792 uint16_t opcode = READ_BT_16(packet,4); 793 if (opcode == hci_stack->last_cmd_opcode){ 794 if (status){ 795 command_completed = 1; 796 log_error("Command status error 0x%02x for expected opcode %04x -> new substate %u", status, opcode, hci_stack->substate); 797 } else { 798 log_info("Command status OK for expected opcode %04x, waiting for command complete", opcode); 799 } 800 } else { 801 log_info("Command status for opcode %04x, expected %04x", opcode, hci_stack->last_cmd_opcode); 802 } 803 } 804 805 if (!command_completed) return; 806 807 switch(hci_stack->substate >> 1){ 808 default: 809 hci_stack->substate++; 810 break; 811 } 812 } 813 814 static void hci_initializing_state_machine(){ 815 // log_info("hci_init: substate %u", hci_stack->substate); 816 if (hci_stack->substate % 2) { 817 // odd: waiting for command completion 818 return; 819 } 820 switch (hci_stack->substate >> 1){ 821 case 0: // RESET 822 hci_state_reset(); 823 824 hci_send_cmd(&hci_reset); 825 if (hci_stack->config == NULL || ((hci_uart_config_t *)hci_stack->config)->baudrate_main == 0){ 826 // skip baud change 827 hci_stack->substate = 4; // >> 1 = 2 828 } 829 break; 830 case 1: // SEND BAUD CHANGE 831 hci_stack->control->baudrate_cmd(hci_stack->config, ((hci_uart_config_t *)hci_stack->config)->baudrate_main, hci_stack->hci_packet_buffer); 832 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 833 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 834 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 835 break; 836 case 2: // LOCAL BAUD CHANGE 837 log_info("Local baud rate change"); 838 hci_stack->hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack->config)->baudrate_main); 839 hci_stack->substate += 2; 840 // break missing here for fall through 841 842 case 3: 843 log_info("Custom init"); 844 // Custom initialization 845 if (hci_stack->control && hci_stack->control->next_cmd){ 846 int valid_cmd = (*hci_stack->control->next_cmd)(hci_stack->config, hci_stack->hci_packet_buffer); 847 if (valid_cmd){ 848 int size = 3 + hci_stack->hci_packet_buffer[2]; 849 hci_stack->last_cmd_opcode = READ_BT_16(hci_stack->hci_packet_buffer, 0); 850 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, hci_stack->hci_packet_buffer, size); 851 hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack->hci_packet_buffer, size); 852 hci_stack->substate = 4; // more init commands 853 break; 854 } 855 log_info("hci_run: init script done"); 856 } 857 // otherwise continue 858 hci_send_cmd(&hci_read_bd_addr); 859 break; 860 case 4: 861 hci_send_cmd(&hci_read_buffer_size); 862 break; 863 case 5: 864 hci_send_cmd(&hci_read_local_supported_features); 865 break; 866 case 6: 867 if (hci_le_supported()){ 868 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 869 } else { 870 // Kensington Bluetoot 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 871 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 872 } 873 874 // skip Classic init commands for LE only chipsets 875 if (!hci_classic_supported()){ 876 if (hci_le_supported()){ 877 hci_stack->substate = 11 << 1; // skip all classic command 878 } else { 879 log_error("Neither BR/EDR nor LE supported"); 880 hci_stack->substate = 14 << 1; // skip all 881 } 882 } 883 break; 884 case 7: 885 if (hci_ssp_supported()){ 886 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack->ssp_enable); 887 break; 888 } 889 hci_stack->substate += 2; 890 // break missing here for fall through 891 892 case 8: 893 // ca. 15 sec 894 hci_send_cmd(&hci_write_page_timeout, 0x6000); 895 break; 896 case 9: 897 hci_send_cmd(&hci_write_class_of_device, hci_stack->class_of_device); 898 break; 899 case 10: 900 if (hci_stack->local_name){ 901 hci_send_cmd(&hci_write_local_name, hci_stack->local_name); 902 } else { 903 char hostname[30]; 904 #ifdef EMBEDDED 905 // BTstack-11:22:33:44:55:66 906 strcpy(hostname, "BTstack "); 907 strcat(hostname, bd_addr_to_str(hci_stack->local_bd_addr)); 908 log_info("---> Name %s", hostname); 909 #else 910 // hostname for POSIX systems 911 gethostname(hostname, 30); 912 hostname[29] = '\0'; 913 #endif 914 hci_send_cmd(&hci_write_local_name, hostname); 915 } 916 break; 917 case 11: 918 hci_send_cmd(&hci_write_scan_enable, (hci_stack->connectable << 1) | hci_stack->discoverable); // page scan 919 if (!hci_le_supported()){ 920 // SKIP LE init for Classic only configuration 921 hci_stack->substate = 14 << 1; 922 } 923 break; 924 925 #ifdef HAVE_BLE 926 // LE INIT 927 case 12: 928 hci_send_cmd(&hci_le_read_buffer_size); 929 break; 930 case 13: 931 // LE Supported Host = 1, Simultaneous Host = 0 932 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 933 break; 934 case 14: 935 // LE Scan Parameters: active scanning, 300 ms interval, 30 ms window, public address, accept all advs 936 hci_send_cmd(&hci_le_set_scan_parameters, 1, 0x1e0, 0x30, 0, 0); 937 break; 938 #endif 939 940 // DONE 941 case 15: 942 // done. 943 hci_stack->state = HCI_STATE_WORKING; 944 hci_emit_state(); 945 break; 946 default: 947 break; 948 } 949 hci_stack->substate++; 950 } 951 952 // avoid huge local variables 953 #ifndef EMBEDDED 954 static device_name_t device_name; 955 #endif 956 static void event_handler(uint8_t *packet, int size){ 957 958 uint16_t event_length = packet[1]; 959 960 // assert packet is complete 961 if (size != event_length + 2){ 962 log_error("hci.c: event_handler called with event packet of wrong size %u, expected %u => dropping packet", size, event_length + 2); 963 return; 964 } 965 966 bd_addr_t addr; 967 bd_addr_type_t addr_type; 968 uint8_t link_type; 969 hci_con_handle_t handle; 970 hci_connection_t * conn; 971 int i; 972 973 // log_info("HCI:EVENT:%02x", packet[0]); 974 975 switch (packet[0]) { 976 977 case HCI_EVENT_COMMAND_COMPLETE: 978 // get num cmd packets 979 // log_info("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u", hci_stack->num_cmd_packets, packet[2]); 980 hci_stack->num_cmd_packets = packet[2]; 981 982 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 983 // from offset 5 984 // status 985 // "The HC_ACL_Data_Packet_Length return parameter will be used to determine the size of the L2CAP segments contained in ACL Data Packets" 986 hci_stack->acl_data_packet_length = READ_BT_16(packet, 6); 987 // ignore: SCO data packet len (8) 988 hci_stack->acl_packets_total_num = packet[9]; 989 // ignore: total num SCO packets 990 if (hci_stack->state == HCI_STATE_INITIALIZING){ 991 // determine usable ACL payload size 992 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->acl_data_packet_length){ 993 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 994 } 995 log_info("hci_read_buffer_size: used size %u, count %u", 996 hci_stack->acl_data_packet_length, hci_stack->acl_packets_total_num); 997 } 998 } 999 #ifdef HAVE_BLE 1000 if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_buffer_size)){ 1001 hci_stack->le_data_packets_length = READ_BT_16(packet, 6); 1002 hci_stack->le_acl_packets_total_num = packet[8]; 1003 // determine usable ACL payload size 1004 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->le_data_packets_length){ 1005 hci_stack->le_data_packets_length = HCI_ACL_PAYLOAD_SIZE; 1006 } 1007 log_info("hci_le_read_buffer_size: size %u, count %u", hci_stack->le_data_packets_length, hci_stack->le_acl_packets_total_num); 1008 } 1009 #endif 1010 // Dump local address 1011 if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)) { 1012 bt_flip_addr(hci_stack->local_bd_addr, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1]); 1013 log_info("Local Address, Status: 0x%02x: Addr: %s", 1014 packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE], bd_addr_to_str(hci_stack->local_bd_addr)); 1015 } 1016 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1017 hci_emit_discoverable_enabled(hci_stack->discoverable); 1018 } 1019 // Note: HCI init checks 1020 if (COMMAND_COMPLETE_EVENT(packet, hci_read_local_supported_features)){ 1021 memcpy(hci_stack->local_supported_features, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1], 8); 1022 log_info("Local Supported Features: 0x%02x%02x%02x%02x%02x%02x%02x%02x", 1023 hci_stack->local_supported_features[0], hci_stack->local_supported_features[1], 1024 hci_stack->local_supported_features[2], hci_stack->local_supported_features[3], 1025 hci_stack->local_supported_features[4], hci_stack->local_supported_features[5], 1026 hci_stack->local_supported_features[6], hci_stack->local_supported_features[7]); 1027 1028 // determine usable ACL packet types based buffer size and supported features 1029 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]); 1030 log_info("packet types %04x", hci_stack->packet_types); 1031 1032 // Classic/LE 1033 log_info("BR/EDR support %u, LE support %u", hci_classic_supported(), hci_le_supported()); 1034 } 1035 break; 1036 1037 case HCI_EVENT_COMMAND_STATUS: 1038 // get num cmd packets 1039 // log_info("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u", hci_stack->num_cmd_packets, packet[3]); 1040 hci_stack->num_cmd_packets = packet[3]; 1041 break; 1042 1043 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:{ 1044 int offset = 3; 1045 for (i=0; i<packet[2];i++){ 1046 handle = READ_BT_16(packet, offset); 1047 offset += 2; 1048 uint16_t num_packets = READ_BT_16(packet, offset); 1049 offset += 2; 1050 1051 conn = hci_connection_for_handle(handle); 1052 if (!conn){ 1053 log_error("hci_number_completed_packet lists unused con handle %u", handle); 1054 continue; 1055 } 1056 1057 if (conn->num_acl_packets_sent >= num_packets){ 1058 conn->num_acl_packets_sent -= num_packets; 1059 } else { 1060 log_error("hci_number_completed_packets, more slots freed then sent."); 1061 conn->num_acl_packets_sent = 0; 1062 } 1063 // log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u", num_packets, handle, conn->num_acl_packets_sent); 1064 } 1065 break; 1066 } 1067 case HCI_EVENT_CONNECTION_REQUEST: 1068 bt_flip_addr(addr, &packet[2]); 1069 // TODO: eval COD 8-10 1070 link_type = packet[11]; 1071 log_info("Connection_incoming: %s, type %u", bd_addr_to_str(addr), link_type); 1072 if (link_type == 1) { // ACL 1073 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1074 if (!conn) { 1075 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 1076 } 1077 if (!conn) { 1078 // CONNECTION REJECTED DUE TO LIMITED RESOURCES (0X0D) 1079 hci_stack->decline_reason = 0x0d; 1080 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1081 break; 1082 } 1083 conn->state = RECEIVED_CONNECTION_REQUEST; 1084 hci_run(); 1085 } else { 1086 // SYNCHRONOUS CONNECTION LIMIT TO A DEVICE EXCEEDED (0X0A) 1087 hci_stack->decline_reason = 0x0a; 1088 BD_ADDR_COPY(hci_stack->decline_addr, addr); 1089 } 1090 break; 1091 1092 case HCI_EVENT_CONNECTION_COMPLETE: 1093 // Connection management 1094 bt_flip_addr(addr, &packet[5]); 1095 log_info("Connection_complete (status=%u) %s", packet[2], bd_addr_to_str(addr)); 1096 addr_type = BD_ADDR_TYPE_CLASSIC; 1097 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1098 if (conn) { 1099 if (!packet[2]){ 1100 conn->state = OPEN; 1101 conn->con_handle = READ_BT_16(packet, 3); 1102 conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES; 1103 1104 // restart timer 1105 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1106 run_loop_add_timer(&conn->timeout); 1107 1108 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1109 1110 hci_emit_nr_connections_changed(); 1111 } else { 1112 int notify_dedicated_bonding_failed = conn->bonding_flags & BONDING_DEDICATED; 1113 uint8_t status = packet[2]; 1114 bd_addr_t bd_address; 1115 memcpy(&bd_address, conn->address, 6); 1116 1117 // connection failed, remove entry 1118 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1119 btstack_memory_hci_connection_free( conn ); 1120 1121 // notify client if dedicated bonding 1122 if (notify_dedicated_bonding_failed){ 1123 log_info("hci notify_dedicated_bonding_failed"); 1124 hci_emit_dedicated_bonding_result(bd_address, status); 1125 } 1126 1127 // if authentication error, also delete link key 1128 if (packet[2] == 0x05) { 1129 hci_drop_link_key_for_bd_addr(&addr); 1130 } 1131 } 1132 } 1133 break; 1134 1135 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 1136 handle = READ_BT_16(packet, 3); 1137 conn = hci_connection_for_handle(handle); 1138 if (!conn) break; 1139 if (!packet[2]){ 1140 uint8_t * features = &packet[5]; 1141 if (features[6] & (1 << 3)){ 1142 conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP; 1143 } 1144 } 1145 conn->bonding_flags |= BONDING_RECEIVED_REMOTE_FEATURES; 1146 log_info("HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE, bonding flags %x", conn->bonding_flags); 1147 if (conn->bonding_flags & BONDING_DEDICATED){ 1148 conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 1149 } 1150 break; 1151 1152 case HCI_EVENT_LINK_KEY_REQUEST: 1153 log_info("HCI_EVENT_LINK_KEY_REQUEST"); 1154 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 1155 // non-bondable mode: link key negative reply will be sent by HANDLE_LINK_KEY_REQUEST 1156 if (hci_stack->bondable && !hci_stack->remote_device_db) break; 1157 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], HANDLE_LINK_KEY_REQUEST); 1158 hci_run(); 1159 // request handled by hci_run() as HANDLE_LINK_KEY_REQUEST gets set 1160 return; 1161 1162 case HCI_EVENT_LINK_KEY_NOTIFICATION: { 1163 bt_flip_addr(addr, &packet[2]); 1164 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 1165 if (!conn) break; 1166 conn->authentication_flags |= RECV_LINK_KEY_NOTIFICATION; 1167 link_key_type_t link_key_type = (link_key_type_t)packet[24]; 1168 // Change Connection Encryption keeps link key type 1169 if (link_key_type != CHANGED_COMBINATION_KEY){ 1170 conn->link_key_type = link_key_type; 1171 } 1172 if (!hci_stack->remote_device_db) break; 1173 hci_stack->remote_device_db->put_link_key(&addr, (link_key_t *) &packet[8], conn->link_key_type); 1174 // still forward event to allow dismiss of pairing dialog 1175 break; 1176 } 1177 1178 case HCI_EVENT_PIN_CODE_REQUEST: 1179 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], LEGACY_PAIRING_ACTIVE); 1180 // non-bondable mode: pin code negative reply will be sent 1181 if (!hci_stack->bondable){ 1182 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], DENY_PIN_CODE_REQUEST); 1183 hci_run(); 1184 return; 1185 } 1186 // PIN CODE REQUEST means the link key request didn't succee -> delete stored link key 1187 if (!hci_stack->remote_device_db) break; 1188 bt_flip_addr(addr, &packet[2]); 1189 hci_stack->remote_device_db->delete_link_key(&addr); 1190 break; 1191 1192 case HCI_EVENT_IO_CAPABILITY_REQUEST: 1193 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_IO_CAPABILITIES_REQUEST); 1194 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_IO_CAPABILITIES_REPLY); 1195 break; 1196 1197 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 1198 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1199 if (!hci_stack->ssp_auto_accept) break; 1200 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_CONFIRM_REPLY); 1201 break; 1202 1203 case HCI_EVENT_USER_PASSKEY_REQUEST: 1204 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 1205 if (!hci_stack->ssp_auto_accept) break; 1206 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_PASSKEY_REPLY); 1207 break; 1208 1209 case HCI_EVENT_ENCRYPTION_CHANGE: 1210 handle = READ_BT_16(packet, 3); 1211 conn = hci_connection_for_handle(handle); 1212 if (!conn) break; 1213 if (packet[2] == 0) { 1214 if (packet[5]){ 1215 conn->authentication_flags |= CONNECTION_ENCRYPTED; 1216 } else { 1217 conn->authentication_flags &= ~CONNECTION_ENCRYPTED; 1218 } 1219 } 1220 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1221 break; 1222 1223 case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT: 1224 handle = READ_BT_16(packet, 3); 1225 conn = hci_connection_for_handle(handle); 1226 if (!conn) break; 1227 1228 // dedicated bonding: send result and disconnect 1229 if (conn->bonding_flags & BONDING_DEDICATED){ 1230 conn->bonding_flags &= ~BONDING_DEDICATED; 1231 conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE; 1232 conn->bonding_status = packet[2]; 1233 break; 1234 } 1235 1236 if (packet[2] == 0 && gap_security_level_for_link_key_type(conn->link_key_type) >= conn->requested_security_level){ 1237 // link key sufficient for requested security 1238 conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 1239 break; 1240 } 1241 // not enough 1242 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 1243 break; 1244 1245 #ifndef EMBEDDED 1246 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 1247 if (!hci_stack->remote_device_db) break; 1248 if (packet[2]) break; // status not ok 1249 bt_flip_addr(addr, &packet[3]); 1250 // fix for invalid remote names - terminate on 0xff 1251 for (i=0; i<248;i++){ 1252 if (packet[9+i] == 0xff){ 1253 packet[9+i] = 0; 1254 break; 1255 } 1256 } 1257 memset(&device_name, 0, sizeof(device_name_t)); 1258 strncpy((char*) device_name, (char*) &packet[9], 248); 1259 hci_stack->remote_device_db->put_name(&addr, &device_name); 1260 break; 1261 1262 case HCI_EVENT_INQUIRY_RESULT: 1263 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:{ 1264 if (!hci_stack->remote_device_db) break; 1265 // first send inq result packet 1266 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1267 // then send cached remote names 1268 int offset = 3; 1269 for (i=0; i<packet[2];i++){ 1270 bt_flip_addr(addr, &packet[offset]); 1271 offset += 14; // 6 + 1 + 1 + 1 + 3 + 2; 1272 if (hci_stack->remote_device_db->get_name(&addr, &device_name)){ 1273 hci_emit_remote_name_cached(&addr, &device_name); 1274 } 1275 } 1276 return; 1277 } 1278 #endif 1279 1280 // HCI_EVENT_DISCONNECTION_COMPLETE 1281 // has been moved down, to first notify stack before shutting connection down 1282 1283 case HCI_EVENT_HARDWARE_ERROR: 1284 if(hci_stack->control && hci_stack->control->hw_error){ 1285 (*hci_stack->control->hw_error)(); 1286 } else { 1287 // if no special requests, just reboot stack 1288 hci_power_control_off(); 1289 hci_power_control_on(); 1290 } 1291 break; 1292 1293 case DAEMON_EVENT_HCI_PACKET_SENT: 1294 // release packet buffer only for asynchronous transport and if there are not further fragements 1295 if (hci_transport_synchronous()) break; 1296 if (hci_stack->acl_fragmentation_total_size) break; 1297 hci_release_packet_buffer(); 1298 break; 1299 1300 #ifdef HAVE_BLE 1301 case HCI_EVENT_LE_META: 1302 switch (packet[2]){ 1303 case HCI_SUBEVENT_LE_ADVERTISING_REPORT: 1304 log_info("advertising report received"); 1305 if (hci_stack->le_scanning_state != LE_SCANNING) break; 1306 le_handle_advertisement_report(packet, size); 1307 break; 1308 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 1309 // Connection management 1310 bt_flip_addr(addr, &packet[8]); 1311 addr_type = (bd_addr_type_t)packet[7]; 1312 log_info("LE Connection_complete (status=%u) type %u, %s", packet[3], addr_type, bd_addr_to_str(addr)); 1313 // LE connections are auto-accepted, so just create a connection if there isn't one already 1314 conn = hci_connection_for_bd_addr_and_type(&addr, addr_type); 1315 if (packet[3]){ 1316 if (conn){ 1317 // outgoing connection failed, remove entry 1318 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 1319 btstack_memory_hci_connection_free( conn ); 1320 } 1321 // if authentication error, also delete link key 1322 if (packet[3] == 0x05) { 1323 hci_drop_link_key_for_bd_addr(&addr); 1324 } 1325 break; 1326 } 1327 if (!conn){ 1328 conn = create_connection_for_bd_addr_and_type(addr, addr_type); 1329 } 1330 if (!conn){ 1331 // no memory 1332 break; 1333 } 1334 1335 conn->state = OPEN; 1336 conn->con_handle = READ_BT_16(packet, 4); 1337 1338 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 1339 1340 // restart timer 1341 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 1342 // run_loop_add_timer(&conn->timeout); 1343 1344 log_info("New connection: handle %u, %s", conn->con_handle, bd_addr_to_str(conn->address)); 1345 1346 hci_emit_nr_connections_changed(); 1347 break; 1348 1349 // log_info("LE buffer size: %u, count %u", READ_BT_16(packet,6), packet[8]); 1350 1351 default: 1352 break; 1353 } 1354 break; 1355 #endif 1356 default: 1357 break; 1358 } 1359 1360 // handle BT initialization 1361 if (hci_stack->state == HCI_STATE_INITIALIZING){ 1362 hci_initializing_event_handler(packet, size); 1363 } 1364 1365 // help with BT sleep 1366 if (hci_stack->state == HCI_STATE_FALLING_ASLEEP 1367 && hci_stack->substate == 1 1368 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 1369 hci_stack->substate++; 1370 } 1371 1372 // notify upper stack 1373 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 1374 1375 // moved here to give upper stack a chance to close down everything with hci_connection_t intact 1376 if (packet[0] == HCI_EVENT_DISCONNECTION_COMPLETE){ 1377 if (!packet[2]){ 1378 handle = READ_BT_16(packet, 3); 1379 hci_connection_t * conn = hci_connection_for_handle(handle); 1380 if (conn) { 1381 uint8_t status = conn->bonding_status; 1382 uint16_t flags = conn->bonding_flags; 1383 bd_addr_t bd_address; 1384 memcpy(&bd_address, conn->address, 6); 1385 hci_shutdown_connection(conn); 1386 // connection struct is gone, don't access anymore 1387 if (flags & BONDING_EMIT_COMPLETE_ON_DISCONNECT){ 1388 hci_emit_dedicated_bonding_result(bd_address, status); 1389 } 1390 } 1391 } 1392 } 1393 1394 // execute main loop 1395 hci_run(); 1396 } 1397 1398 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 1399 hci_dump_packet(packet_type, 1, packet, size); 1400 switch (packet_type) { 1401 case HCI_EVENT_PACKET: 1402 event_handler(packet, size); 1403 break; 1404 case HCI_ACL_DATA_PACKET: 1405 acl_handler(packet, size); 1406 break; 1407 default: 1408 break; 1409 } 1410 } 1411 1412 /** Register HCI packet handlers */ 1413 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 1414 hci_stack->packet_handler = handler; 1415 } 1416 1417 static void hci_state_reset(){ 1418 // no connections yet 1419 hci_stack->connections = NULL; 1420 1421 // keep discoverable/connectable as this has been requested by the client(s) 1422 // hci_stack->discoverable = 0; 1423 // hci_stack->connectable = 0; 1424 // hci_stack->bondable = 1; 1425 1426 // buffer is free 1427 hci_stack->hci_packet_buffer_reserved = 0; 1428 1429 // no pending cmds 1430 hci_stack->decline_reason = 0; 1431 hci_stack->new_scan_enable_value = 0xff; 1432 1433 // LE 1434 hci_stack->adv_addr_type = 0; 1435 memset(hci_stack->adv_address, 0, 6); 1436 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1437 hci_stack->le_scan_type = 0xff; 1438 hci_stack->le_connection_parameter_range.le_conn_interval_min = 0x0006; 1439 hci_stack->le_connection_parameter_range.le_conn_interval_max = 0x0C80; 1440 hci_stack->le_connection_parameter_range.le_conn_latency_min = 0x0000; 1441 hci_stack->le_connection_parameter_range.le_conn_latency_max = 0x03E8; 1442 hci_stack->le_connection_parameter_range.le_supervision_timeout_min = 0x000A; 1443 hci_stack->le_connection_parameter_range.le_supervision_timeout_max = 0x0C80; 1444 } 1445 1446 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 1447 1448 #ifdef HAVE_MALLOC 1449 if (!hci_stack) { 1450 hci_stack = (hci_stack_t*) malloc(sizeof(hci_stack_t)); 1451 } 1452 #else 1453 hci_stack = &hci_stack_static; 1454 #endif 1455 memset(hci_stack, 0, sizeof(hci_stack_t)); 1456 1457 // reference to use transport layer implementation 1458 hci_stack->hci_transport = transport; 1459 1460 // references to used control implementation 1461 hci_stack->control = control; 1462 1463 // reference to used config 1464 hci_stack->config = config; 1465 1466 // higher level handler 1467 hci_stack->packet_handler = dummy_handler; 1468 1469 // store and open remote device db 1470 hci_stack->remote_device_db = remote_device_db; 1471 if (hci_stack->remote_device_db) { 1472 hci_stack->remote_device_db->open(); 1473 } 1474 1475 // max acl payload size defined in config.h 1476 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 1477 1478 // register packet handlers with transport 1479 transport->register_packet_handler(&packet_handler); 1480 1481 hci_stack->state = HCI_STATE_OFF; 1482 1483 // class of device 1484 hci_stack->class_of_device = 0x007a020c; // Smartphone 1485 1486 // bondable by default 1487 hci_stack->bondable = 1; 1488 1489 // Secure Simple Pairing default: enable, no I/O capabilities, general bonding, mitm not required, auto accept 1490 hci_stack->ssp_enable = 1; 1491 hci_stack->ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 1492 hci_stack->ssp_authentication_requirement = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING; 1493 hci_stack->ssp_auto_accept = 1; 1494 1495 hci_state_reset(); 1496 } 1497 1498 void hci_close(){ 1499 // close remote device db 1500 if (hci_stack->remote_device_db) { 1501 hci_stack->remote_device_db->close(); 1502 } 1503 while (hci_stack->connections) { 1504 // cancel all l2cap connections 1505 hci_emit_disconnection_complete(((hci_connection_t *) hci_stack->connections)->con_handle, 0x16); // terminated by local host 1506 hci_shutdown_connection((hci_connection_t *) hci_stack->connections); 1507 } 1508 hci_power_control(HCI_POWER_OFF); 1509 1510 #ifdef HAVE_MALLOC 1511 free(hci_stack); 1512 #endif 1513 hci_stack = NULL; 1514 } 1515 1516 void hci_set_class_of_device(uint32_t class_of_device){ 1517 hci_stack->class_of_device = class_of_device; 1518 } 1519 1520 void hci_disable_l2cap_timeout_check(){ 1521 disable_l2cap_timeouts = 1; 1522 } 1523 // State-Module-Driver overview 1524 // state module low-level 1525 // HCI_STATE_OFF off close 1526 // HCI_STATE_INITIALIZING, on open 1527 // HCI_STATE_WORKING, on open 1528 // HCI_STATE_HALTING, on open 1529 // HCI_STATE_SLEEPING, off/sleep close 1530 // HCI_STATE_FALLING_ASLEEP on open 1531 1532 static int hci_power_control_on(void){ 1533 1534 // power on 1535 int err = 0; 1536 if (hci_stack->control && hci_stack->control->on){ 1537 err = (*hci_stack->control->on)(hci_stack->config); 1538 } 1539 if (err){ 1540 log_error( "POWER_ON failed"); 1541 hci_emit_hci_open_failed(); 1542 return err; 1543 } 1544 1545 // open low-level device 1546 err = hci_stack->hci_transport->open(hci_stack->config); 1547 if (err){ 1548 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1549 if (hci_stack->control && hci_stack->control->off){ 1550 (*hci_stack->control->off)(hci_stack->config); 1551 } 1552 hci_emit_hci_open_failed(); 1553 return err; 1554 } 1555 return 0; 1556 } 1557 1558 static void hci_power_control_off(void){ 1559 1560 log_info("hci_power_control_off"); 1561 1562 // close low-level device 1563 hci_stack->hci_transport->close(hci_stack->config); 1564 1565 log_info("hci_power_control_off - hci_transport closed"); 1566 1567 // power off 1568 if (hci_stack->control && hci_stack->control->off){ 1569 (*hci_stack->control->off)(hci_stack->config); 1570 } 1571 1572 log_info("hci_power_control_off - control closed"); 1573 1574 hci_stack->state = HCI_STATE_OFF; 1575 } 1576 1577 static void hci_power_control_sleep(void){ 1578 1579 log_info("hci_power_control_sleep"); 1580 1581 #if 0 1582 // don't close serial port during sleep 1583 1584 // close low-level device 1585 hci_stack->hci_transport->close(hci_stack->config); 1586 #endif 1587 1588 // sleep mode 1589 if (hci_stack->control && hci_stack->control->sleep){ 1590 (*hci_stack->control->sleep)(hci_stack->config); 1591 } 1592 1593 hci_stack->state = HCI_STATE_SLEEPING; 1594 } 1595 1596 static int hci_power_control_wake(void){ 1597 1598 log_info("hci_power_control_wake"); 1599 1600 // wake on 1601 if (hci_stack->control && hci_stack->control->wake){ 1602 (*hci_stack->control->wake)(hci_stack->config); 1603 } 1604 1605 #if 0 1606 // open low-level device 1607 int err = hci_stack->hci_transport->open(hci_stack->config); 1608 if (err){ 1609 log_error( "HCI_INIT failed, turning Bluetooth off again"); 1610 if (hci_stack->control && hci_stack->control->off){ 1611 (*hci_stack->control->off)(hci_stack->config); 1612 } 1613 hci_emit_hci_open_failed(); 1614 return err; 1615 } 1616 #endif 1617 1618 return 0; 1619 } 1620 1621 static void hci_power_transition_to_initializing(void){ 1622 // set up state machine 1623 hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent 1624 hci_stack->hci_packet_buffer_reserved = 0; 1625 hci_stack->state = HCI_STATE_INITIALIZING; 1626 hci_stack->substate = 0; 1627 } 1628 1629 int hci_power_control(HCI_POWER_MODE power_mode){ 1630 1631 log_info("hci_power_control: %u, current mode %u", power_mode, hci_stack->state); 1632 1633 int err = 0; 1634 switch (hci_stack->state){ 1635 1636 case HCI_STATE_OFF: 1637 switch (power_mode){ 1638 case HCI_POWER_ON: 1639 err = hci_power_control_on(); 1640 if (err) { 1641 log_error("hci_power_control_on() error %u", err); 1642 return err; 1643 } 1644 hci_power_transition_to_initializing(); 1645 break; 1646 case HCI_POWER_OFF: 1647 // do nothing 1648 break; 1649 case HCI_POWER_SLEEP: 1650 // do nothing (with SLEEP == OFF) 1651 break; 1652 } 1653 break; 1654 1655 case HCI_STATE_INITIALIZING: 1656 switch (power_mode){ 1657 case HCI_POWER_ON: 1658 // do nothing 1659 break; 1660 case HCI_POWER_OFF: 1661 // no connections yet, just turn it off 1662 hci_power_control_off(); 1663 break; 1664 case HCI_POWER_SLEEP: 1665 // no connections yet, just turn it off 1666 hci_power_control_sleep(); 1667 break; 1668 } 1669 break; 1670 1671 case HCI_STATE_WORKING: 1672 switch (power_mode){ 1673 case HCI_POWER_ON: 1674 // do nothing 1675 break; 1676 case HCI_POWER_OFF: 1677 // see hci_run 1678 hci_stack->state = HCI_STATE_HALTING; 1679 break; 1680 case HCI_POWER_SLEEP: 1681 // see hci_run 1682 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1683 hci_stack->substate = 0; 1684 break; 1685 } 1686 break; 1687 1688 case HCI_STATE_HALTING: 1689 switch (power_mode){ 1690 case HCI_POWER_ON: 1691 hci_power_transition_to_initializing(); 1692 break; 1693 case HCI_POWER_OFF: 1694 // do nothing 1695 break; 1696 case HCI_POWER_SLEEP: 1697 // see hci_run 1698 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1699 hci_stack->substate = 0; 1700 break; 1701 } 1702 break; 1703 1704 case HCI_STATE_FALLING_ASLEEP: 1705 switch (power_mode){ 1706 case HCI_POWER_ON: 1707 1708 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1709 // nothing to do, if H4 supports power management 1710 if (bt_control_iphone_power_management_enabled()){ 1711 hci_stack->state = HCI_STATE_INITIALIZING; 1712 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1713 break; 1714 } 1715 #endif 1716 hci_power_transition_to_initializing(); 1717 break; 1718 case HCI_POWER_OFF: 1719 // see hci_run 1720 hci_stack->state = HCI_STATE_HALTING; 1721 break; 1722 case HCI_POWER_SLEEP: 1723 // do nothing 1724 break; 1725 } 1726 break; 1727 1728 case HCI_STATE_SLEEPING: 1729 switch (power_mode){ 1730 case HCI_POWER_ON: 1731 1732 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1733 // nothing to do, if H4 supports power management 1734 if (bt_control_iphone_power_management_enabled()){ 1735 hci_stack->state = HCI_STATE_INITIALIZING; 1736 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1737 hci_update_scan_enable(); 1738 break; 1739 } 1740 #endif 1741 err = hci_power_control_wake(); 1742 if (err) return err; 1743 hci_power_transition_to_initializing(); 1744 break; 1745 case HCI_POWER_OFF: 1746 hci_stack->state = HCI_STATE_HALTING; 1747 break; 1748 case HCI_POWER_SLEEP: 1749 // do nothing 1750 break; 1751 } 1752 break; 1753 } 1754 1755 // create internal event 1756 hci_emit_state(); 1757 1758 // trigger next/first action 1759 hci_run(); 1760 1761 return 0; 1762 } 1763 1764 static void hci_update_scan_enable(void){ 1765 // 2 = page scan, 1 = inq scan 1766 hci_stack->new_scan_enable_value = hci_stack->connectable << 1 | hci_stack->discoverable; 1767 hci_run(); 1768 } 1769 1770 void hci_discoverable_control(uint8_t enable){ 1771 if (enable) enable = 1; // normalize argument 1772 1773 if (hci_stack->discoverable == enable){ 1774 hci_emit_discoverable_enabled(hci_stack->discoverable); 1775 return; 1776 } 1777 1778 hci_stack->discoverable = enable; 1779 hci_update_scan_enable(); 1780 } 1781 1782 void hci_connectable_control(uint8_t enable){ 1783 if (enable) enable = 1; // normalize argument 1784 1785 // don't emit event 1786 if (hci_stack->connectable == enable) return; 1787 1788 hci_stack->connectable = enable; 1789 hci_update_scan_enable(); 1790 } 1791 1792 bd_addr_t * hci_local_bd_addr(void){ 1793 return &hci_stack->local_bd_addr; 1794 } 1795 1796 void hci_run(){ 1797 1798 hci_connection_t * connection; 1799 linked_item_t * it; 1800 1801 // send continuation fragments first, as they block the prepared packet buffer 1802 if (hci_stack->acl_fragmentation_total_size > 0) { 1803 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(hci_stack->hci_packet_buffer); 1804 if (hci_can_send_prepared_acl_packet_now(con_handle)){ 1805 hci_connection_t *connection = hci_connection_for_handle(con_handle); 1806 if (connection) { 1807 hci_send_acl_packet_fragments(connection); 1808 return; 1809 } 1810 // connection gone -> discard further fragments 1811 hci_stack->acl_fragmentation_total_size = 0; 1812 hci_stack->acl_fragmentation_pos = 0; 1813 } 1814 } 1815 1816 if (!hci_can_send_command_packet_now()) return; 1817 1818 // global/non-connection oriented commands 1819 1820 // decline incoming connections 1821 if (hci_stack->decline_reason){ 1822 uint8_t reason = hci_stack->decline_reason; 1823 hci_stack->decline_reason = 0; 1824 hci_send_cmd(&hci_reject_connection_request, hci_stack->decline_addr, reason); 1825 return; 1826 } 1827 1828 // send scan enable 1829 if (hci_stack->state == HCI_STATE_WORKING && hci_stack->new_scan_enable_value != 0xff && hci_classic_supported()){ 1830 hci_send_cmd(&hci_write_scan_enable, hci_stack->new_scan_enable_value); 1831 hci_stack->new_scan_enable_value = 0xff; 1832 return; 1833 } 1834 1835 #ifdef HAVE_BLE 1836 // handle le scan 1837 if (hci_stack->state == HCI_STATE_WORKING){ 1838 switch(hci_stack->le_scanning_state){ 1839 case LE_START_SCAN: 1840 hci_stack->le_scanning_state = LE_SCANNING; 1841 hci_send_cmd(&hci_le_set_scan_enable, 1, 0); 1842 return; 1843 1844 case LE_STOP_SCAN: 1845 hci_stack->le_scanning_state = LE_SCAN_IDLE; 1846 hci_send_cmd(&hci_le_set_scan_enable, 0, 0); 1847 return; 1848 default: 1849 break; 1850 } 1851 if (hci_stack->le_scan_type != 0xff){ 1852 // defaults: active scanning, accept all advertisement packets 1853 int scan_type = hci_stack->le_scan_type; 1854 hci_stack->le_scan_type = 0xff; 1855 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); 1856 return; 1857 } 1858 } 1859 #endif 1860 1861 // send pending HCI commands 1862 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 1863 connection = (hci_connection_t *) it; 1864 1865 switch(connection->state){ 1866 case SEND_CREATE_CONNECTION: 1867 switch(connection->address_type){ 1868 case BD_ADDR_TYPE_CLASSIC: 1869 log_info("sending hci_create_connection"); 1870 hci_send_cmd(&hci_create_connection, connection->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 1871 break; 1872 default: 1873 #ifdef HAVE_BLE 1874 log_info("sending hci_le_create_connection"); 1875 hci_send_cmd(&hci_le_create_connection, 1876 0x0060, // scan interval: 60 ms 1877 0x0030, // scan interval: 30 ms 1878 0, // don't use whitelist 1879 connection->address_type, // peer address type 1880 connection->address, // peer bd addr 1881 hci_stack->adv_addr_type, // our addr type: 1882 0x0008, // conn interval min 1883 0x0018, // conn interval max 1884 0, // conn latency 1885 0x0048, // supervision timeout 1886 0x0001, // min ce length 1887 0x0001 // max ce length 1888 ); 1889 1890 connection->state = SENT_CREATE_CONNECTION; 1891 #endif 1892 break; 1893 } 1894 return; 1895 1896 case RECEIVED_CONNECTION_REQUEST: 1897 log_info("sending hci_accept_connection_request"); 1898 connection->state = ACCEPTED_CONNECTION_REQUEST; 1899 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 1900 return; 1901 1902 #ifdef HAVE_BLE 1903 case SEND_CANCEL_CONNECTION: 1904 connection->state = SENT_CANCEL_CONNECTION; 1905 hci_send_cmd(&hci_le_create_connection_cancel); 1906 return; 1907 #endif 1908 case SEND_DISCONNECT: 1909 connection->state = SENT_DISCONNECT; 1910 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1911 return; 1912 1913 default: 1914 break; 1915 } 1916 1917 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 1918 log_info("responding to link key request"); 1919 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 1920 link_key_t link_key; 1921 link_key_type_t link_key_type; 1922 if ( hci_stack->remote_device_db 1923 && hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type) 1924 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 1925 connection->link_key_type = link_key_type; 1926 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 1927 } else { 1928 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 1929 } 1930 return; 1931 } 1932 1933 if (connection->authentication_flags & DENY_PIN_CODE_REQUEST){ 1934 log_info("denying to pin request"); 1935 connectionClearAuthenticationFlags(connection, DENY_PIN_CODE_REQUEST); 1936 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 1937 return; 1938 } 1939 1940 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 1941 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 1942 log_info("IO Capability Request received, stack bondable %u, io cap %u", hci_stack->bondable, hci_stack->ssp_io_capability); 1943 if (hci_stack->bondable && (hci_stack->ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN)){ 1944 // tweak authentication requirements 1945 uint8_t authreq = hci_stack->ssp_authentication_requirement; 1946 if (connection->bonding_flags & BONDING_DEDICATED){ 1947 authreq = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING; 1948 } 1949 if (gap_mitm_protection_required_for_security_level(connection->requested_security_level)){ 1950 authreq |= 1; 1951 } 1952 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack->ssp_io_capability, NULL, authreq); 1953 } else { 1954 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 1955 } 1956 return; 1957 } 1958 1959 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 1960 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 1961 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 1962 return; 1963 } 1964 1965 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 1966 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 1967 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 1968 return; 1969 } 1970 1971 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 1972 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 1973 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 1974 return; 1975 } 1976 1977 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 1978 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 1979 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 1980 return; 1981 } 1982 if (connection->bonding_flags & BONDING_DISCONNECT_DEDICATED_DONE){ 1983 connection->bonding_flags &= ~BONDING_DISCONNECT_DEDICATED_DONE; 1984 connection->bonding_flags |= BONDING_EMIT_COMPLETE_ON_DISCONNECT; 1985 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // authentication done 1986 return; 1987 } 1988 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 1989 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 1990 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 1991 return; 1992 } 1993 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 1994 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 1995 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 1996 return; 1997 } 1998 1999 #ifdef HAVE_BLE 2000 if (connection->le_con_parameter_update_state == CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS){ 2001 connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 2002 2003 uint16_t connection_interval_min = connection->le_conn_interval_min; 2004 connection->le_conn_interval_min = 0; 2005 hci_send_cmd(&hci_le_connection_update, connection->con_handle, connection_interval_min, 2006 connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout, 2007 0x0000, 0xffff); 2008 } 2009 #endif 2010 } 2011 2012 switch (hci_stack->state){ 2013 case HCI_STATE_INITIALIZING: 2014 hci_initializing_state_machine(); 2015 break; 2016 2017 case HCI_STATE_HALTING: 2018 2019 log_info("HCI_STATE_HALTING"); 2020 // close all open connections 2021 connection = (hci_connection_t *) hci_stack->connections; 2022 if (connection){ 2023 2024 // send disconnect 2025 if (!hci_can_send_command_packet_now()) return; 2026 2027 log_info("HCI_STATE_HALTING, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2028 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2029 2030 // send disconnected event right away - causes higher layer connections to get closed, too. 2031 hci_shutdown_connection(connection); 2032 return; 2033 } 2034 log_info("HCI_STATE_HALTING, calling off"); 2035 2036 // switch mode 2037 hci_power_control_off(); 2038 2039 log_info("HCI_STATE_HALTING, emitting state"); 2040 hci_emit_state(); 2041 log_info("HCI_STATE_HALTING, done"); 2042 break; 2043 2044 case HCI_STATE_FALLING_ASLEEP: 2045 switch(hci_stack->substate) { 2046 case 0: 2047 log_info("HCI_STATE_FALLING_ASLEEP"); 2048 // close all open connections 2049 connection = (hci_connection_t *) hci_stack->connections; 2050 2051 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2052 // don't close connections, if H4 supports power management 2053 if (bt_control_iphone_power_management_enabled()){ 2054 connection = NULL; 2055 } 2056 #endif 2057 if (connection){ 2058 2059 // send disconnect 2060 if (!hci_can_send_command_packet_now()) return; 2061 2062 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u", connection, (uint16_t)connection->con_handle); 2063 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 2064 2065 // send disconnected event right away - causes higher layer connections to get closed, too. 2066 hci_shutdown_connection(connection); 2067 return; 2068 } 2069 2070 if (hci_classic_supported()){ 2071 // disable page and inquiry scan 2072 if (!hci_can_send_command_packet_now()) return; 2073 2074 log_info("HCI_STATE_HALTING, disabling inq scans"); 2075 hci_send_cmd(&hci_write_scan_enable, hci_stack->connectable << 1); // drop inquiry scan but keep page scan 2076 2077 // continue in next sub state 2078 hci_stack->substate++; 2079 break; 2080 } 2081 // fall through for ble-only chips 2082 2083 case 2: 2084 log_info("HCI_STATE_HALTING, calling sleep"); 2085 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 2086 // don't actually go to sleep, if H4 supports power management 2087 if (bt_control_iphone_power_management_enabled()){ 2088 // SLEEP MODE reached 2089 hci_stack->state = HCI_STATE_SLEEPING; 2090 hci_emit_state(); 2091 break; 2092 } 2093 #endif 2094 // switch mode 2095 hci_power_control_sleep(); // changes hci_stack->state to SLEEP 2096 hci_emit_state(); 2097 break; 2098 2099 default: 2100 break; 2101 } 2102 break; 2103 2104 default: 2105 break; 2106 } 2107 } 2108 2109 int hci_send_cmd_packet(uint8_t *packet, int size){ 2110 bd_addr_t addr; 2111 hci_connection_t * conn; 2112 // house-keeping 2113 2114 // create_connection? 2115 if (IS_COMMAND(packet, hci_create_connection)){ 2116 bt_flip_addr(addr, &packet[3]); 2117 log_info("Create_connection to %s", bd_addr_to_str(addr)); 2118 2119 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2120 if (!conn){ 2121 conn = create_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_CLASSIC); 2122 if (!conn){ 2123 // notify client that alloc failed 2124 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 2125 return 0; // don't sent packet to controller 2126 } 2127 conn->state = SEND_CREATE_CONNECTION; 2128 } 2129 log_info("conn state %u", conn->state); 2130 switch (conn->state){ 2131 // if connection active exists 2132 case OPEN: 2133 // and OPEN, emit connection complete command, don't send to controller 2134 hci_emit_connection_complete(conn, 0); 2135 return 0; 2136 case SEND_CREATE_CONNECTION: 2137 // connection created by hci, e.g. dedicated bonding 2138 break; 2139 default: 2140 // otherwise, just ignore as it is already in the open process 2141 return 0; 2142 } 2143 conn->state = SENT_CREATE_CONNECTION; 2144 } 2145 2146 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 2147 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 2148 } 2149 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 2150 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 2151 } 2152 2153 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 2154 if (hci_stack->remote_device_db){ 2155 bt_flip_addr(addr, &packet[3]); 2156 hci_stack->remote_device_db->delete_link_key(&addr); 2157 } 2158 } 2159 2160 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply) 2161 || IS_COMMAND(packet, hci_pin_code_request_reply)){ 2162 bt_flip_addr(addr, &packet[3]); 2163 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2164 if (conn){ 2165 connectionClearAuthenticationFlags(conn, LEGACY_PAIRING_ACTIVE); 2166 } 2167 } 2168 2169 if (IS_COMMAND(packet, hci_user_confirmation_request_negative_reply) 2170 || IS_COMMAND(packet, hci_user_confirmation_request_reply) 2171 || IS_COMMAND(packet, hci_user_passkey_request_negative_reply) 2172 || IS_COMMAND(packet, hci_user_passkey_request_reply)) { 2173 bt_flip_addr(addr, &packet[3]); 2174 conn = hci_connection_for_bd_addr_and_type(&addr, BD_ADDR_TYPE_CLASSIC); 2175 if (conn){ 2176 connectionClearAuthenticationFlags(conn, SSP_PAIRING_ACTIVE); 2177 } 2178 } 2179 2180 #ifdef HAVE_BLE 2181 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 2182 hci_stack->adv_addr_type = packet[8]; 2183 } 2184 if (IS_COMMAND(packet, hci_le_set_random_address)){ 2185 bt_flip_addr(hci_stack->adv_address, &packet[3]); 2186 } 2187 #endif 2188 2189 hci_stack->num_cmd_packets--; 2190 2191 hci_dump_packet(HCI_COMMAND_DATA_PACKET, 0, packet, size); 2192 int err = hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 2193 2194 // release packet buffer for synchronous transport implementations 2195 if (hci_transport_synchronous() && (packet == hci_stack->hci_packet_buffer)){ 2196 hci_stack->hci_packet_buffer_reserved = 0; 2197 } 2198 2199 return err; 2200 } 2201 2202 // disconnect because of security block 2203 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 2204 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2205 if (!connection) return; 2206 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 2207 } 2208 2209 2210 // Configure Secure Simple Pairing 2211 2212 // enable will enable SSP during init 2213 void hci_ssp_set_enable(int enable){ 2214 hci_stack->ssp_enable = enable; 2215 } 2216 2217 int hci_local_ssp_activated(){ 2218 return hci_ssp_supported() && hci_stack->ssp_enable; 2219 } 2220 2221 // if set, BTstack will respond to io capability request using authentication requirement 2222 void hci_ssp_set_io_capability(int io_capability){ 2223 hci_stack->ssp_io_capability = io_capability; 2224 } 2225 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 2226 hci_stack->ssp_authentication_requirement = authentication_requirement; 2227 } 2228 2229 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 2230 void hci_ssp_set_auto_accept(int auto_accept){ 2231 hci_stack->ssp_auto_accept = auto_accept; 2232 } 2233 2234 /** 2235 * pre: numcmds >= 0 - it's allowed to send a command to the controller 2236 */ 2237 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 2238 2239 if (!hci_can_send_command_packet_now()){ 2240 log_error("hci_send_cmd called but cannot send packet now"); 2241 return 0; 2242 } 2243 2244 // for HCI INITIALIZATION 2245 // log_info("hci_send_cmd: opcode %04x", cmd->opcode); 2246 hci_stack->last_cmd_opcode = cmd->opcode; 2247 2248 hci_reserve_packet_buffer(); 2249 uint8_t * packet = hci_stack->hci_packet_buffer; 2250 2251 va_list argptr; 2252 va_start(argptr, cmd); 2253 uint16_t size = hci_create_cmd_internal(packet, cmd, argptr); 2254 va_end(argptr); 2255 2256 return hci_send_cmd_packet(packet, size); 2257 } 2258 2259 // Create various non-HCI events. 2260 // TODO: generalize, use table similar to hci_create_command 2261 2262 void hci_emit_state(){ 2263 log_info("BTSTACK_EVENT_STATE %u", hci_stack->state); 2264 uint8_t event[3]; 2265 event[0] = BTSTACK_EVENT_STATE; 2266 event[1] = sizeof(event) - 2; 2267 event[2] = hci_stack->state; 2268 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2269 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2270 } 2271 2272 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 2273 uint8_t event[13]; 2274 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 2275 event[1] = sizeof(event) - 2; 2276 event[2] = status; 2277 bt_store_16(event, 3, conn->con_handle); 2278 bt_flip_addr(&event[5], conn->address); 2279 event[11] = 1; // ACL connection 2280 event[12] = 0; // encryption disabled 2281 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2282 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2283 } 2284 2285 void hci_emit_le_connection_complete(uint8_t address_type, bd_addr_t * address, uint16_t conn_handle, uint8_t status){ 2286 uint8_t event[21]; 2287 event[0] = HCI_EVENT_LE_META; 2288 event[1] = sizeof(event) - 2; 2289 event[2] = HCI_SUBEVENT_LE_CONNECTION_COMPLETE; 2290 event[3] = status; 2291 bt_store_16(event, 4, conn_handle); 2292 event[6] = 0; // TODO: role 2293 event[7] = address_type; 2294 bt_flip_addr(&event[8], *address); 2295 bt_store_16(event, 14, 0); // interval 2296 bt_store_16(event, 16, 0); // latency 2297 bt_store_16(event, 18, 0); // supervision timeout 2298 event[20] = 0; // master clock accuracy 2299 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2300 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2301 } 2302 2303 void hci_emit_disconnection_complete(uint16_t handle, uint8_t reason){ 2304 uint8_t event[6]; 2305 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 2306 event[1] = sizeof(event) - 2; 2307 event[2] = 0; // status = OK 2308 bt_store_16(event, 3, handle); 2309 event[5] = reason; 2310 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2311 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2312 } 2313 2314 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 2315 if (disable_l2cap_timeouts) return; 2316 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 2317 uint8_t event[4]; 2318 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 2319 event[1] = sizeof(event) - 2; 2320 bt_store_16(event, 2, conn->con_handle); 2321 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)); 2322 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2323 } 2324 2325 void hci_emit_nr_connections_changed(){ 2326 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 2327 uint8_t event[3]; 2328 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 2329 event[1] = sizeof(event) - 2; 2330 event[2] = nr_hci_connections(); 2331 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2332 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2333 } 2334 2335 void hci_emit_hci_open_failed(){ 2336 log_info("BTSTACK_EVENT_POWERON_FAILED"); 2337 uint8_t event[2]; 2338 event[0] = BTSTACK_EVENT_POWERON_FAILED; 2339 event[1] = sizeof(event) - 2; 2340 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2341 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2342 } 2343 2344 #ifndef EMBEDDED 2345 void hci_emit_btstack_version() { 2346 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 2347 uint8_t event[6]; 2348 event[0] = BTSTACK_EVENT_VERSION; 2349 event[1] = sizeof(event) - 2; 2350 event[2] = BTSTACK_MAJOR; 2351 event[3] = BTSTACK_MINOR; 2352 bt_store_16(event, 4, BTSTACK_REVISION); 2353 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2354 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2355 } 2356 #endif 2357 2358 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 2359 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 2360 uint8_t event[3]; 2361 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 2362 event[1] = sizeof(event) - 2; 2363 event[2] = enabled; 2364 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2365 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2366 } 2367 2368 void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){ 2369 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 2370 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 2371 event[1] = sizeof(event) - 2 - 1; 2372 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 2373 bt_flip_addr(&event[3], *addr); 2374 memcpy(&event[9], name, 248); 2375 2376 event[9+248] = 0; // assert \0 for log_info 2377 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(*addr), &event[9]); 2378 2379 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 2380 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 2381 } 2382 2383 void hci_emit_discoverable_enabled(uint8_t enabled){ 2384 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 2385 uint8_t event[3]; 2386 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 2387 event[1] = sizeof(event) - 2; 2388 event[2] = enabled; 2389 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2390 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2391 } 2392 2393 void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){ 2394 log_info("hci_emit_security_level %u for handle %x", level, con_handle); 2395 uint8_t event[5]; 2396 int pos = 0; 2397 event[pos++] = GAP_SECURITY_LEVEL; 2398 event[pos++] = sizeof(event) - 2; 2399 bt_store_16(event, 2, con_handle); 2400 pos += 2; 2401 event[pos++] = level; 2402 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2403 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2404 } 2405 2406 void hci_emit_dedicated_bonding_result(bd_addr_t address, uint8_t status){ 2407 log_info("hci_emit_dedicated_bonding_result %u ", status); 2408 uint8_t event[9]; 2409 int pos = 0; 2410 event[pos++] = GAP_DEDICATED_BONDING_COMPLETED; 2411 event[pos++] = sizeof(event) - 2; 2412 event[pos++] = status; 2413 bt_flip_addr( * (bd_addr_t *) &event[pos], address); 2414 pos += 6; 2415 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 2416 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 2417 } 2418 2419 // query if remote side supports SSP 2420 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 2421 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2422 if (!connection) return 0; 2423 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 2424 } 2425 2426 int hci_ssp_supported_on_both_sides(hci_con_handle_t handle){ 2427 return hci_local_ssp_activated() && hci_remote_ssp_supported(handle); 2428 } 2429 2430 // GAP API 2431 /** 2432 * @bbrief enable/disable bonding. default is enabled 2433 * @praram enabled 2434 */ 2435 void gap_set_bondable_mode(int enable){ 2436 hci_stack->bondable = enable ? 1 : 0; 2437 } 2438 2439 /** 2440 * @brief map link keys to security levels 2441 */ 2442 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 2443 switch (link_key_type){ 2444 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 2445 return LEVEL_4; 2446 case COMBINATION_KEY: 2447 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 2448 return LEVEL_3; 2449 default: 2450 return LEVEL_2; 2451 } 2452 } 2453 2454 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 2455 if (!connection) return LEVEL_0; 2456 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 2457 return gap_security_level_for_link_key_type(connection->link_key_type); 2458 } 2459 2460 2461 int gap_mitm_protection_required_for_security_level(gap_security_level_t level){ 2462 log_info("gap_mitm_protection_required_for_security_level %u", level); 2463 return level > LEVEL_2; 2464 } 2465 2466 /** 2467 * @brief get current security level 2468 */ 2469 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 2470 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2471 if (!connection) return LEVEL_0; 2472 return gap_security_level_for_connection(connection); 2473 } 2474 2475 /** 2476 * @brief request connection to device to 2477 * @result GAP_AUTHENTICATION_RESULT 2478 */ 2479 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 2480 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2481 if (!connection){ 2482 hci_emit_security_level(con_handle, LEVEL_0); 2483 return; 2484 } 2485 gap_security_level_t current_level = gap_security_level(con_handle); 2486 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 2487 if (current_level >= requested_level){ 2488 hci_emit_security_level(con_handle, current_level); 2489 return; 2490 } 2491 2492 connection->requested_security_level = requested_level; 2493 2494 // would enabling ecnryption suffice (>= LEVEL_2)? 2495 if (hci_stack->remote_device_db){ 2496 link_key_type_t link_key_type; 2497 link_key_t link_key; 2498 if (hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type)){ 2499 if (gap_security_level_for_link_key_type(link_key_type) >= requested_level){ 2500 connection->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 2501 return; 2502 } 2503 } 2504 } 2505 2506 // try to authenticate connection 2507 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 2508 hci_run(); 2509 } 2510 2511 /** 2512 * @brief start dedicated bonding with device. disconnect after bonding 2513 * @param device 2514 * @param request MITM protection 2515 * @result GAP_DEDICATED_BONDING_COMPLETE 2516 */ 2517 int gap_dedicated_bonding(bd_addr_t device, int mitm_protection_required){ 2518 2519 // create connection state machine 2520 hci_connection_t * connection = create_connection_for_bd_addr_and_type(device, BD_ADDR_TYPE_CLASSIC); 2521 2522 if (!connection){ 2523 return BTSTACK_MEMORY_ALLOC_FAILED; 2524 } 2525 2526 // delete linkn key 2527 hci_drop_link_key_for_bd_addr( (bd_addr_t *) &device); 2528 2529 // configure LEVEL_2/3, dedicated bonding 2530 connection->state = SEND_CREATE_CONNECTION; 2531 connection->requested_security_level = mitm_protection_required ? LEVEL_3 : LEVEL_2; 2532 log_info("gap_dedicated_bonding, mitm %u -> level %u", mitm_protection_required, connection->requested_security_level); 2533 connection->bonding_flags = BONDING_DEDICATED; 2534 2535 // wait for GAP Security Result and send GAP Dedicated Bonding complete 2536 2537 // handle: connnection failure (connection complete != ok) 2538 // handle: authentication failure 2539 // handle: disconnect on done 2540 2541 hci_run(); 2542 2543 return 0; 2544 } 2545 2546 void gap_set_local_name(const char * local_name){ 2547 hci_stack->local_name = local_name; 2548 } 2549 2550 le_command_status_t le_central_start_scan(){ 2551 if (hci_stack->le_scanning_state == LE_SCANNING) return BLE_PERIPHERAL_OK; 2552 hci_stack->le_scanning_state = LE_START_SCAN; 2553 hci_run(); 2554 return BLE_PERIPHERAL_OK; 2555 } 2556 2557 le_command_status_t le_central_stop_scan(){ 2558 if ( hci_stack->le_scanning_state == LE_SCAN_IDLE) return BLE_PERIPHERAL_OK; 2559 hci_stack->le_scanning_state = LE_STOP_SCAN; 2560 hci_run(); 2561 return BLE_PERIPHERAL_OK; 2562 } 2563 2564 void le_central_set_scan_parameters(uint8_t scan_type, uint16_t scan_interval, uint16_t scan_window){ 2565 hci_stack->le_scan_type = scan_type; 2566 hci_stack->le_scan_interval = scan_interval; 2567 hci_stack->le_scan_window = scan_window; 2568 hci_run(); 2569 } 2570 2571 le_command_status_t le_central_connect(bd_addr_t * addr, bd_addr_type_t addr_type){ 2572 hci_connection_t * conn = hci_connection_for_bd_addr_and_type(addr, addr_type); 2573 if (!conn){ 2574 log_info("le_central_connect: no connection exists yet, creating context"); 2575 conn = create_connection_for_bd_addr_and_type(*addr, addr_type); 2576 if (!conn){ 2577 // notify client that alloc failed 2578 hci_emit_le_connection_complete(addr_type, addr, 0, BTSTACK_MEMORY_ALLOC_FAILED); 2579 log_info("le_central_connect: failed to alloc hci_connection_t"); 2580 return BLE_PERIPHERAL_NOT_CONNECTED; // don't sent packet to controller 2581 } 2582 conn->state = SEND_CREATE_CONNECTION; 2583 log_info("le_central_connect: send create connection next"); 2584 hci_run(); 2585 return BLE_PERIPHERAL_OK; 2586 } 2587 2588 if (!hci_is_le_connection(conn) || 2589 conn->state == SEND_CREATE_CONNECTION || 2590 conn->state == SENT_CREATE_CONNECTION) { 2591 hci_emit_le_connection_complete(conn->address_type, &conn->address, 0, ERROR_CODE_COMMAND_DISALLOWED); 2592 log_error("le_central_connect: classic connection or connect is already being created"); 2593 return BLE_PERIPHERAL_IN_WRONG_STATE; 2594 } 2595 2596 log_info("le_central_connect: context exists with state %u", conn->state); 2597 hci_emit_le_connection_complete(conn->address_type, &conn->address, conn->con_handle, 0); 2598 hci_run(); 2599 return BLE_PERIPHERAL_OK; 2600 } 2601 2602 // @assumption: only a single outgoing LE Connection exists 2603 static hci_connection_t * le_central_get_outgoing_connection(){ 2604 linked_item_t *it; 2605 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 2606 hci_connection_t * conn = (hci_connection_t *) it; 2607 if (!hci_is_le_connection(conn)) continue; 2608 switch (conn->state){ 2609 case SEND_CREATE_CONNECTION: 2610 case SENT_CREATE_CONNECTION: 2611 return conn; 2612 default: 2613 break; 2614 }; 2615 } 2616 return NULL; 2617 } 2618 2619 le_command_status_t le_central_connect_cancel(){ 2620 hci_connection_t * conn = le_central_get_outgoing_connection(); 2621 switch (conn->state){ 2622 case SEND_CREATE_CONNECTION: 2623 // skip sending create connection and emit event instead 2624 hci_emit_le_connection_complete(conn->address_type, &conn->address, 0, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 2625 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 2626 btstack_memory_hci_connection_free( conn ); 2627 break; 2628 case SENT_CREATE_CONNECTION: 2629 // request to send cancel connection 2630 conn->state = SEND_CANCEL_CONNECTION; 2631 hci_run(); 2632 break; 2633 default: 2634 break; 2635 } 2636 return BLE_PERIPHERAL_OK; 2637 } 2638 2639 /** 2640 * @brief Updates the connection parameters for a given LE connection 2641 * @param handle 2642 * @param conn_interval_min (unit: 1.25ms) 2643 * @param conn_interval_max (unit: 1.25ms) 2644 * @param conn_latency 2645 * @param supervision_timeout (unit: 10ms) 2646 * @returns 0 if ok 2647 */ 2648 int gap_update_connection_parameters(hci_con_handle_t con_handle, uint16_t conn_interval_min, 2649 uint16_t conn_interval_max, uint16_t conn_latency, uint16_t supervision_timeout){ 2650 hci_connection_t * connection = hci_connection_for_handle(con_handle); 2651 if (!connection) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 2652 connection->le_conn_interval_min = conn_interval_min; 2653 connection->le_conn_interval_max = conn_interval_max; 2654 connection->le_conn_latency = conn_latency; 2655 connection->le_supervision_timeout = supervision_timeout; 2656 return 0; 2657 } 2658 2659 le_command_status_t gap_disconnect(hci_con_handle_t handle){ 2660 hci_connection_t * conn = hci_connection_for_handle(handle); 2661 if (!conn){ 2662 hci_emit_disconnection_complete(handle, 0); 2663 return BLE_PERIPHERAL_OK; 2664 } 2665 conn->state = SEND_DISCONNECT; 2666 hci_run(); 2667 return BLE_PERIPHERAL_OK; 2668 } 2669 2670 void hci_disconnect_all(){ 2671 linked_list_iterator_t it; 2672 linked_list_iterator_init(&it, &hci_stack->connections); 2673 while (linked_list_iterator_has_next(&it)){ 2674 hci_connection_t * con = (hci_connection_t*) linked_list_iterator_next(&it); 2675 if (con->state == SENT_DISCONNECT) continue; 2676 con->state = SEND_DISCONNECT; 2677 } 2678 hci_run(); 2679 } 2680