1 /* 2 * Copyright (C) 2009-2012 by Matthias Ringwald 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY MATTHIAS RINGWALD AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at [email protected] 34 * 35 */ 36 37 /* 38 * hci.c 39 * 40 * Created by Matthias Ringwald on 4/29/09. 41 * 42 */ 43 44 #include "btstack-config.h" 45 46 #include "hci.h" 47 #include "gap.h" 48 49 #include <stdarg.h> 50 #include <string.h> 51 #include <stdio.h> 52 53 #ifndef EMBEDDED 54 #include <unistd.h> // gethostbyname 55 #include <btstack/version.h> 56 #endif 57 58 #include "btstack_memory.h" 59 #include "debug.h" 60 #include "hci_dump.h" 61 62 #include <btstack/hci_cmds.h> 63 64 #define HCI_CONNECTION_TIMEOUT_MS 10000 65 66 #define HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP 11 67 68 #ifdef USE_BLUETOOL 69 #include "bt_control_iphone.h" 70 #endif 71 72 static void hci_update_scan_enable(void); 73 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection); 74 75 // the STACK is here 76 #ifndef HAVE_MALLOC 77 static hci_stack_t hci_stack_static; 78 #endif 79 static hci_stack_t * hci_stack = NULL; 80 81 // test helper 82 static uint8_t disable_l2cap_timeouts = 0; 83 84 85 /** 86 * get connection for a given handle 87 * 88 * @return connection OR NULL, if not found 89 */ 90 hci_connection_t * hci_connection_for_handle(hci_con_handle_t con_handle){ 91 linked_item_t *it; 92 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 93 if ( ((hci_connection_t *) it)->con_handle == con_handle){ 94 return (hci_connection_t *) it; 95 } 96 } 97 return NULL; 98 } 99 100 hci_connection_t * hci_connection_for_bd_addr(bd_addr_t * addr){ 101 linked_item_t *it; 102 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 103 hci_connection_t * connection = (hci_connection_t *) it; 104 if (memcmp(addr, connection->address, 6) == 0) { 105 return connection; 106 } 107 } 108 return NULL; 109 } 110 111 static void hci_connection_timeout_handler(timer_source_t *timer){ 112 hci_connection_t * connection = (hci_connection_t *) linked_item_get_user(&timer->item); 113 #ifdef HAVE_TIME 114 struct timeval tv; 115 gettimeofday(&tv, NULL); 116 if (tv.tv_sec >= connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000) { 117 // connections might be timed out 118 hci_emit_l2cap_check_timeout(connection); 119 } 120 #endif 121 #ifdef HAVE_TICK 122 if (embedded_get_ticks() > connection->timestamp + embedded_ticks_for_ms(HCI_CONNECTION_TIMEOUT_MS)){ 123 // connections might be timed out 124 hci_emit_l2cap_check_timeout(connection); 125 } 126 #endif 127 run_loop_set_timer(timer, HCI_CONNECTION_TIMEOUT_MS); 128 run_loop_add_timer(timer); 129 } 130 131 static void hci_connection_timestamp(hci_connection_t *connection){ 132 #ifdef HAVE_TIME 133 gettimeofday(&connection->timestamp, NULL); 134 #endif 135 #ifdef HAVE_TICK 136 connection->timestamp = embedded_get_ticks(); 137 #endif 138 } 139 140 /** 141 * create connection for given address 142 * 143 * @return connection OR NULL, if no memory left 144 */ 145 static hci_connection_t * create_connection_for_addr(bd_addr_t addr){ 146 147 printf("create_connection_for_addr %s\n", bd_addr_to_str(addr)); 148 hci_connection_t * conn = (hci_connection_t *) btstack_memory_hci_connection_get(); 149 if (!conn) return NULL; 150 BD_ADDR_COPY(conn->address, addr); 151 conn->con_handle = 0xffff; 152 conn->authentication_flags = AUTH_FLAGS_NONE; 153 conn->bonding_flags = 0; 154 conn->requested_security_level = LEVEL_0; 155 linked_item_set_user(&conn->timeout.item, conn); 156 conn->timeout.process = hci_connection_timeout_handler; 157 hci_connection_timestamp(conn); 158 conn->acl_recombination_length = 0; 159 conn->acl_recombination_pos = 0; 160 conn->num_acl_packets_sent = 0; 161 linked_list_add(&hci_stack->connections, (linked_item_t *) conn); 162 return conn; 163 } 164 165 /** 166 * get connection for given address 167 * 168 * @return connection OR NULL, if not found 169 */ 170 static hci_connection_t * connection_for_address(bd_addr_t address){ 171 linked_item_t *it; 172 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 173 if ( ! BD_ADDR_CMP( ((hci_connection_t *) it)->address, address) ){ 174 return (hci_connection_t *) it; 175 } 176 } 177 return NULL; 178 } 179 180 inline static void connectionSetAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 181 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags | flags); 182 } 183 184 inline static void connectionClearAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 185 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags & ~flags); 186 } 187 188 189 /** 190 * add authentication flags and reset timer 191 */ 192 static void hci_add_connection_flags_for_flipped_bd_addr(uint8_t *bd_addr, hci_authentication_flags_t flags){ 193 bd_addr_t addr; 194 bt_flip_addr(addr, *(bd_addr_t *) bd_addr); 195 hci_connection_t * conn = connection_for_address(addr); 196 if (conn) { 197 connectionSetAuthenticationFlags(conn, flags); 198 hci_connection_timestamp(conn); 199 } 200 } 201 202 int hci_authentication_active_for_handle(hci_con_handle_t handle){ 203 hci_connection_t * conn = hci_connection_for_handle(handle); 204 if (!conn) return 0; 205 if (conn->authentication_flags & LEGACY_PAIRING_ACTIVE) return 1; 206 if (conn->authentication_flags & SSP_PAIRING_ACTIVE) return 1; 207 return 0; 208 } 209 210 void hci_drop_link_key_for_bd_addr(bd_addr_t *addr){ 211 if (hci_stack->remote_device_db) { 212 hci_stack->remote_device_db->delete_link_key(addr); 213 } 214 } 215 216 217 /** 218 * count connections 219 */ 220 static int nr_hci_connections(void){ 221 int count = 0; 222 linked_item_t *it; 223 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next, count++); 224 return count; 225 } 226 227 /** 228 * Dummy handler called by HCI 229 */ 230 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 231 } 232 233 uint8_t hci_number_outgoing_packets(hci_con_handle_t handle){ 234 hci_connection_t * connection = hci_connection_for_handle(handle); 235 if (!connection) { 236 log_error("hci_number_outgoing_packets connectino for handle %u does not exist!\n", handle); 237 return 0; 238 } 239 return connection->num_acl_packets_sent; 240 } 241 242 uint8_t hci_number_free_acl_slots(){ 243 uint8_t free_slots = hci_stack->total_num_acl_packets; 244 linked_item_t *it; 245 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 246 hci_connection_t * connection = (hci_connection_t *) it; 247 if (free_slots < connection->num_acl_packets_sent) { 248 log_error("hci_number_free_acl_slots: sum of outgoing packets > total acl packets!\n"); 249 return 0; 250 } 251 free_slots -= connection->num_acl_packets_sent; 252 } 253 return free_slots; 254 } 255 256 int hci_can_send_packet_now(uint8_t packet_type){ 257 258 // check for async hci transport implementations 259 if (hci_stack->hci_transport->can_send_packet_now){ 260 if (!hci_stack->hci_transport->can_send_packet_now(packet_type)){ 261 return 0; 262 } 263 } 264 265 // check regular Bluetooth flow control 266 switch (packet_type) { 267 case HCI_ACL_DATA_PACKET: 268 return hci_number_free_acl_slots(); 269 case HCI_COMMAND_DATA_PACKET: 270 return hci_stack->num_cmd_packets; 271 default: 272 return 0; 273 } 274 } 275 276 // same as hci_can_send_packet_now, but also checks if packet buffer is free for use 277 int hci_can_send_packet_now_using_packet_buffer(uint8_t packet_type){ 278 if (hci_stack->hci_packet_buffer_reserved) return 0; 279 return hci_can_send_packet_now(packet_type); 280 } 281 282 // reserves outgoing packet buffer. @returns 1 if successful 283 int hci_reserve_packet_buffer(void){ 284 if (hci_stack->hci_packet_buffer_reserved) return 0; 285 hci_stack->hci_packet_buffer_reserved = 1; 286 return 1; 287 } 288 289 // assumption: synchronous implementations don't provide can_send_packet_now as they don't keep the buffer after the call 290 int hci_transport_synchronous(void){ 291 return hci_stack->hci_transport->can_send_packet_now == NULL; 292 } 293 294 int hci_send_acl_packet(uint8_t *packet, int size){ 295 296 // check for free places on BT module 297 if (!hci_number_free_acl_slots()) return BTSTACK_ACL_BUFFERS_FULL; 298 299 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 300 hci_connection_t *connection = hci_connection_for_handle( con_handle); 301 if (!connection) return 0; 302 hci_connection_timestamp(connection); 303 304 // count packet 305 connection->num_acl_packets_sent++; 306 // log_info("hci_send_acl_packet - handle %u, sent %u\n", connection->con_handle, connection->num_acl_packets_sent); 307 308 // send packet 309 int err = hci_stack->hci_transport->send_packet(HCI_ACL_DATA_PACKET, packet, size); 310 311 // free packet buffer for synchronous transport implementations 312 if (hci_transport_synchronous()){ 313 hci_stack->hci_packet_buffer_reserved = 0; 314 } 315 316 return err; 317 } 318 319 static void acl_handler(uint8_t *packet, int size){ 320 321 // log_info("acl_handler: size %u", size); 322 323 // get info 324 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 325 hci_connection_t *conn = hci_connection_for_handle(con_handle); 326 uint8_t acl_flags = READ_ACL_FLAGS(packet); 327 uint16_t acl_length = READ_ACL_LENGTH(packet); 328 329 // ignore non-registered handle 330 if (!conn){ 331 log_error( "hci.c: acl_handler called with non-registered handle %u!\n" , con_handle); 332 return; 333 } 334 335 // assert packet is complete 336 if (acl_length + 4 != size){ 337 log_error("hci.c: acl_handler called with ACL packet of wrong size %u, expected %u => dropping packet", size, acl_length + 4); 338 return; 339 } 340 341 // update idle timestamp 342 hci_connection_timestamp(conn); 343 344 // handle different packet types 345 switch (acl_flags & 0x03) { 346 347 case 0x01: // continuation fragment 348 349 // sanity check 350 if (conn->acl_recombination_pos == 0) { 351 log_error( "ACL Cont Fragment but no first fragment for handle 0x%02x\n", con_handle); 352 return; 353 } 354 355 // append fragment payload (header already stored) 356 memcpy(&conn->acl_recombination_buffer[conn->acl_recombination_pos], &packet[4], acl_length ); 357 conn->acl_recombination_pos += acl_length; 358 359 // log_error( "ACL Cont Fragment: acl_len %u, combined_len %u, l2cap_len %u\n", acl_length, 360 // conn->acl_recombination_pos, conn->acl_recombination_length); 361 362 // forward complete L2CAP packet if complete. 363 if (conn->acl_recombination_pos >= conn->acl_recombination_length + 4 + 4){ // pos already incl. ACL header 364 365 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, conn->acl_recombination_buffer, conn->acl_recombination_pos); 366 // reset recombination buffer 367 conn->acl_recombination_length = 0; 368 conn->acl_recombination_pos = 0; 369 } 370 break; 371 372 case 0x02: { // first fragment 373 374 // sanity check 375 if (conn->acl_recombination_pos) { 376 log_error( "ACL First Fragment but data in buffer for handle 0x%02x\n", con_handle); 377 return; 378 } 379 380 // peek into L2CAP packet! 381 uint16_t l2cap_length = READ_L2CAP_LENGTH( packet ); 382 383 // log_info( "ACL First Fragment: acl_len %u, l2cap_len %u\n", acl_length, l2cap_length); 384 385 // compare fragment size to L2CAP packet size 386 if (acl_length >= l2cap_length + 4){ 387 388 // forward fragment as L2CAP packet 389 hci_stack->packet_handler(HCI_ACL_DATA_PACKET, packet, acl_length + 4); 390 391 } else { 392 // store first fragment and tweak acl length for complete package 393 memcpy(conn->acl_recombination_buffer, packet, acl_length + 4); 394 conn->acl_recombination_pos = acl_length + 4; 395 conn->acl_recombination_length = l2cap_length; 396 bt_store_16(conn->acl_recombination_buffer, 2, l2cap_length +4); 397 } 398 break; 399 400 } 401 default: 402 log_error( "hci.c: acl_handler called with invalid packet boundary flags %u\n", acl_flags & 0x03); 403 return; 404 } 405 406 // execute main loop 407 hci_run(); 408 } 409 410 static void hci_shutdown_connection(hci_connection_t *conn){ 411 log_info("Connection closed: handle %u, %s\n", conn->con_handle, bd_addr_to_str(conn->address)); 412 413 // cancel all l2cap connections 414 hci_emit_disconnection_complete(conn->con_handle, 0x16); // terminated by local host 415 416 run_loop_remove_timer(&conn->timeout); 417 418 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 419 btstack_memory_hci_connection_free( conn ); 420 421 // now it's gone 422 hci_emit_nr_connections_changed(); 423 } 424 425 static const uint16_t packet_type_sizes[] = { 426 0, HCI_ACL_2DH1_SIZE, HCI_ACL_3DH1_SIZE, HCI_ACL_DM1_SIZE, 427 HCI_ACL_DH1_SIZE, 0, 0, 0, 428 HCI_ACL_2DH3_SIZE, HCI_ACL_3DH3_SIZE, HCI_ACL_DM3_SIZE, HCI_ACL_DH3_SIZE, 429 HCI_ACL_2DH5_SIZE, HCI_ACL_3DH5_SIZE, HCI_ACL_DM5_SIZE, HCI_ACL_DH5_SIZE 430 }; 431 static const uint8_t packet_type_feature_requirement_bit[] = { 432 0, // 3 slot packets 433 1, // 5 slot packets 434 25, // EDR 2 mpbs 435 26, // EDR 3 mbps 436 39, // 3 slot EDR packts 437 40, // 5 slot EDR packet 438 }; 439 static const uint16_t packet_type_feature_packet_mask[] = { 440 0x0f00, // 3 slot packets 441 0xf000, // 5 slot packets 442 0x1102, // EDR 2 mpbs 443 0x2204, // EDR 3 mbps 444 0x0300, // 3 slot EDR packts 445 0x3000, // 5 slot EDR packet 446 }; 447 448 static uint16_t hci_acl_packet_types_for_buffer_size_and_local_features(uint16_t buffer_size, uint8_t * local_supported_features){ 449 // enable packet types based on size 450 uint16_t packet_types = 0; 451 int i; 452 for (i=0;i<16;i++){ 453 if (packet_type_sizes[i] == 0) continue; 454 if (packet_type_sizes[i] <= buffer_size){ 455 packet_types |= 1 << i; 456 } 457 } 458 // disable packet types due to missing local supported features 459 for (i=0;i<sizeof(packet_type_feature_requirement_bit);i++){ 460 int bit_idx = packet_type_feature_requirement_bit[i]; 461 int feature_set = (local_supported_features[bit_idx >> 3] & (1<<(bit_idx & 7))) != 0; 462 if (feature_set) continue; 463 log_info("Features bit %02u is not set, removing packet types 0x%04x", bit_idx, packet_type_feature_packet_mask[i]); 464 packet_types &= ~packet_type_feature_packet_mask[i]; 465 } 466 // flip bits for "may not be used" 467 packet_types ^= 0x3306; 468 return packet_types; 469 } 470 471 uint16_t hci_usable_acl_packet_types(void){ 472 return hci_stack->packet_types; 473 } 474 475 uint8_t* hci_get_outgoing_acl_packet_buffer(void){ 476 // hci packet buffer is >= acl data packet length 477 return hci_stack->hci_packet_buffer; 478 } 479 480 uint16_t hci_max_acl_data_packet_length(void){ 481 return hci_stack->acl_data_packet_length; 482 } 483 484 int hci_ssp_supported(void){ 485 // No 51, byte 6, bit 3 486 return (hci_stack->local_supported_features[6] & (1 << 3)) != 0; 487 } 488 489 int hci_classic_supported(void){ 490 // No 37, byte 4, bit 5, = No BR/EDR Support 491 return (hci_stack->local_supported_features[4] & (1 << 5)) == 0; 492 } 493 494 int hci_le_supported(void){ 495 // No 37, byte 4, bit 6 = LE Supported (Controller) 496 #ifdef HAVE_BLE 497 return (hci_stack->local_supported_features[4] & (1 << 6)) != 0; 498 #else 499 return 0; 500 #endif 501 } 502 503 // get addr type and address used in advertisement packets 504 void hci_le_advertisement_address(uint8_t * addr_type, bd_addr_t * addr){ 505 *addr_type = hci_stack->adv_addr_type; 506 if (hci_stack->adv_addr_type){ 507 memcpy(addr, hci_stack->adv_address, 6); 508 } else { 509 memcpy(addr, hci_stack->local_bd_addr, 6); 510 } 511 } 512 513 // avoid huge local variables 514 #ifndef EMBEDDED 515 static device_name_t device_name; 516 #endif 517 static void event_handler(uint8_t *packet, int size){ 518 519 uint16_t event_length = packet[1]; 520 521 // assert packet is complete 522 if (size != event_length + 2){ 523 log_error("hci.c: event_handler called with event packet of wrong size %u, expected %u => dropping packet", size, event_length + 2); 524 return; 525 } 526 527 bd_addr_t addr; 528 uint8_t link_type; 529 hci_con_handle_t handle; 530 hci_connection_t * conn; 531 int i; 532 533 // printf("HCI:EVENT:%02x\n", packet[0]); 534 535 switch (packet[0]) { 536 537 case HCI_EVENT_COMMAND_COMPLETE: 538 // get num cmd packets 539 // log_info("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u\n", hci_stack->num_cmd_packets, packet[2]); 540 hci_stack->num_cmd_packets = packet[2]; 541 542 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 543 // from offset 5 544 // status 545 // "The HC_ACL_Data_Packet_Length return parameter will be used to determine the size of the L2CAP segments contained in ACL Data Packets" 546 hci_stack->acl_data_packet_length = READ_BT_16(packet, 6); 547 // ignore: SCO data packet len (8) 548 hci_stack->total_num_acl_packets = packet[9]; 549 // ignore: total num SCO packets 550 if (hci_stack->state == HCI_STATE_INITIALIZING){ 551 // determine usable ACL payload size 552 if (HCI_ACL_PAYLOAD_SIZE < hci_stack->acl_data_packet_length){ 553 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 554 } 555 log_info("hci_read_buffer_size: used size %u, count %u\n", 556 hci_stack->acl_data_packet_length, hci_stack->total_num_acl_packets); 557 } 558 } 559 #ifdef HAVE_BLE 560 if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_buffer_size)){ 561 hci_stack->le_data_packet_length = READ_BT_16(packet, 6); 562 hci_stack->total_num_le_packets = packet[8]; 563 log_info("hci_le_read_buffer_size: size %u, count %u\n", hci_stack->le_data_packet_length, hci_stack->total_num_le_packets); 564 } 565 #endif 566 // Dump local address 567 if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)) { 568 bt_flip_addr(hci_stack->local_bd_addr, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1]); 569 log_info("Local Address, Status: 0x%02x: Addr: %s\n", 570 packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE], bd_addr_to_str(hci_stack->local_bd_addr)); 571 } 572 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 573 hci_emit_discoverable_enabled(hci_stack->discoverable); 574 } 575 // Note: HCI init checks 576 if (COMMAND_COMPLETE_EVENT(packet, hci_read_local_supported_features)){ 577 memcpy(hci_stack->local_supported_features, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1], 8); 578 log_info("Local Supported Features: 0x%02x%02x%02x%02x%02x%02x%02x%02x", 579 hci_stack->local_supported_features[0], hci_stack->local_supported_features[1], 580 hci_stack->local_supported_features[2], hci_stack->local_supported_features[3], 581 hci_stack->local_supported_features[4], hci_stack->local_supported_features[5], 582 hci_stack->local_supported_features[6], hci_stack->local_supported_features[7]); 583 584 // determine usable ACL packet types based buffer size and supported features 585 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]); 586 log_info("packet types %04x", hci_stack->packet_types); 587 588 // Classic/LE 589 log_info("BR/EDR support %u, LE support %u", hci_classic_supported(), hci_le_supported()); 590 } 591 break; 592 593 case HCI_EVENT_COMMAND_STATUS: 594 // get num cmd packets 595 // log_info("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u\n", hci_stack->num_cmd_packets, packet[3]); 596 hci_stack->num_cmd_packets = packet[3]; 597 break; 598 599 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 600 for (i=0; i<packet[2];i++){ 601 handle = READ_BT_16(packet, 3 + 2*i); 602 uint16_t num_packets = READ_BT_16(packet, 3 + packet[2]*2 + 2*i); 603 conn = hci_connection_for_handle(handle); 604 if (!conn){ 605 log_error("hci_number_completed_packet lists unused con handle %u\n", handle); 606 continue; 607 } 608 conn->num_acl_packets_sent -= num_packets; 609 // log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u\n", num_packets, handle, conn->num_acl_packets_sent); 610 } 611 break; 612 613 case HCI_EVENT_CONNECTION_REQUEST: 614 bt_flip_addr(addr, &packet[2]); 615 // TODO: eval COD 8-10 616 link_type = packet[11]; 617 log_info("Connection_incoming: %s, type %u\n", bd_addr_to_str(addr), link_type); 618 if (link_type == 1) { // ACL 619 conn = connection_for_address(addr); 620 if (!conn) { 621 conn = create_connection_for_addr(addr); 622 } 623 if (!conn) { 624 // CONNECTION REJECTED DUE TO LIMITED RESOURCES (0X0D) 625 hci_stack->decline_reason = 0x0d; 626 BD_ADDR_COPY(hci_stack->decline_addr, addr); 627 break; 628 } 629 conn->state = RECEIVED_CONNECTION_REQUEST; 630 hci_run(); 631 } else { 632 // SYNCHRONOUS CONNECTION LIMIT TO A DEVICE EXCEEDED (0X0A) 633 hci_stack->decline_reason = 0x0a; 634 BD_ADDR_COPY(hci_stack->decline_addr, addr); 635 } 636 break; 637 638 case HCI_EVENT_CONNECTION_COMPLETE: 639 // Connection management 640 bt_flip_addr(addr, &packet[5]); 641 log_info("Connection_complete (status=%u) %s\n", packet[2], bd_addr_to_str(addr)); 642 conn = connection_for_address(addr); 643 if (conn) { 644 if (!packet[2]){ 645 conn->state = OPEN; 646 conn->con_handle = READ_BT_16(packet, 3); 647 conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES; 648 649 // restart timer 650 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 651 run_loop_add_timer(&conn->timeout); 652 653 log_info("New connection: handle %u, %s\n", conn->con_handle, bd_addr_to_str(conn->address)); 654 655 hci_emit_nr_connections_changed(); 656 } else { 657 // notify client if dedicated bonding 658 if (conn->bonding_flags & BONDING_DEDICATED){ 659 hci_emit_dedicated_bonding_result(conn, packet[2]); 660 } 661 662 // connection failed, remove entry 663 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 664 btstack_memory_hci_connection_free( conn ); 665 666 // if authentication error, also delete link key 667 if (packet[2] == 0x05) { 668 hci_drop_link_key_for_bd_addr(&addr); 669 } 670 } 671 } 672 break; 673 674 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 675 handle = READ_BT_16(packet, 3); 676 conn = hci_connection_for_handle(handle); 677 if (!conn) break; 678 if (!packet[2]){ 679 uint8_t * features = &packet[5]; 680 if (features[6] & (1 << 3)){ 681 conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP; 682 } 683 } 684 conn->bonding_flags |= BONDING_RECEIVED_REMOTE_FEATURES; 685 log_info("HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE, bonding flags %x", conn->bonding_flags); 686 if (conn->bonding_flags & BONDING_DEDICATED){ 687 conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 688 } 689 break; 690 691 case HCI_EVENT_LINK_KEY_REQUEST: 692 log_info("HCI_EVENT_LINK_KEY_REQUEST\n"); 693 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 694 // non-bondable mode: link key negative reply will be sent by HANDLE_LINK_KEY_REQUEST 695 if (hci_stack->bondable && !hci_stack->remote_device_db) break; 696 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], HANDLE_LINK_KEY_REQUEST); 697 hci_run(); 698 // request handled by hci_run() as HANDLE_LINK_KEY_REQUEST gets set 699 return; 700 701 case HCI_EVENT_LINK_KEY_NOTIFICATION: { 702 bt_flip_addr(addr, &packet[2]); 703 conn = connection_for_address(addr); 704 if (!conn) break; 705 conn->authentication_flags |= RECV_LINK_KEY_NOTIFICATION; 706 link_key_type_t link_key_type = packet[24]; 707 // Change Connection Encryption keeps link key type 708 if (link_key_type != CHANGED_COMBINATION_KEY){ 709 conn->link_key_type = link_key_type; 710 } 711 if (!hci_stack->remote_device_db) break; 712 hci_stack->remote_device_db->put_link_key(&addr, (link_key_t *) &packet[8], conn->link_key_type); 713 // still forward event to allow dismiss of pairing dialog 714 break; 715 } 716 717 case HCI_EVENT_PIN_CODE_REQUEST: 718 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], LEGACY_PAIRING_ACTIVE); 719 // non-bondable mode: pin code negative reply will be sent 720 if (!hci_stack->bondable){ 721 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], DENY_PIN_CODE_REQUEST); 722 hci_run(); 723 return; 724 } 725 // PIN CODE REQUEST means the link key request didn't succee -> delete stored link key 726 if (!hci_stack->remote_device_db) break; 727 bt_flip_addr(addr, &packet[2]); 728 hci_stack->remote_device_db->delete_link_key(&addr); 729 break; 730 731 case HCI_EVENT_IO_CAPABILITY_REQUEST: 732 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_IO_CAPABILITIES_REQUEST); 733 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_IO_CAPABILITIES_REPLY); 734 break; 735 736 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 737 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 738 if (!hci_stack->ssp_auto_accept) break; 739 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_CONFIRM_REPLY); 740 break; 741 742 case HCI_EVENT_USER_PASSKEY_REQUEST: 743 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 744 if (!hci_stack->ssp_auto_accept) break; 745 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_PASSKEY_REPLY); 746 break; 747 748 case HCI_EVENT_ENCRYPTION_CHANGE: 749 handle = READ_BT_16(packet, 3); 750 conn = hci_connection_for_handle(handle); 751 if (!conn) break; 752 if (packet[2] == 0) { 753 if (packet[5]){ 754 conn->authentication_flags |= CONNECTION_ENCRYPTED; 755 } else { 756 conn->authentication_flags &= ~CONNECTION_ENCRYPTED; 757 } 758 } 759 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 760 break; 761 762 case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT: 763 handle = READ_BT_16(packet, 3); 764 conn = hci_connection_for_handle(handle); 765 if (!conn) break; 766 767 // dedicated bonding: send result and disconnect 768 if (conn->bonding_flags & BONDING_DEDICATED){ 769 conn->bonding_flags &= ~BONDING_DEDICATED; 770 hci_emit_dedicated_bonding_result( conn, packet[2]); 771 conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE; 772 break; 773 } 774 775 if (packet[2] == 0 && gap_security_level_for_link_key_type(conn->link_key_type) >= conn->requested_security_level){ 776 // link key sufficient for requested security 777 conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 778 break; 779 } 780 // not enough 781 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 782 break; 783 784 #ifndef EMBEDDED 785 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 786 if (!hci_stack->remote_device_db) break; 787 if (packet[2]) break; // status not ok 788 bt_flip_addr(addr, &packet[3]); 789 // fix for invalid remote names - terminate on 0xff 790 for (i=0; i<248;i++){ 791 if (packet[9+i] == 0xff){ 792 packet[9+i] = 0; 793 break; 794 } 795 } 796 memset(&device_name, 0, sizeof(device_name_t)); 797 strncpy((char*) device_name, (char*) &packet[9], 248); 798 hci_stack->remote_device_db->put_name(&addr, &device_name); 799 break; 800 801 case HCI_EVENT_INQUIRY_RESULT: 802 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI: 803 if (!hci_stack->remote_device_db) break; 804 // first send inq result packet 805 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 806 // then send cached remote names 807 for (i=0; i<packet[2];i++){ 808 bt_flip_addr(addr, &packet[3+i*6]); 809 if (hci_stack->remote_device_db->get_name(&addr, &device_name)){ 810 hci_emit_remote_name_cached(&addr, &device_name); 811 } 812 } 813 return; 814 #endif 815 816 case HCI_EVENT_DISCONNECTION_COMPLETE: 817 if (!packet[2]){ 818 handle = READ_BT_16(packet, 3); 819 hci_connection_t * conn = hci_connection_for_handle(handle); 820 if (conn) { 821 hci_shutdown_connection(conn); 822 } 823 } 824 break; 825 826 case HCI_EVENT_HARDWARE_ERROR: 827 if(hci_stack->control && hci_stack->control->hw_error){ 828 (*hci_stack->control->hw_error)(); 829 } 830 break; 831 832 case DAEMON_EVENT_HCI_PACKET_SENT: 833 // free packet buffer for asynchronous transport 834 if (hci_transport_synchronous()) break; 835 hci_stack->hci_packet_buffer_reserved = 0; 836 break; 837 838 #ifdef HAVE_BLE 839 case HCI_EVENT_LE_META: 840 switch (packet[2]) { 841 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 842 // Connection management 843 bt_flip_addr(addr, &packet[8]); 844 log_info("LE Connection_complete (status=%u) %s\n", packet[3], bd_addr_to_str(addr)); 845 // LE connections are auto-accepted, so just create a connection if there isn't one already 846 conn = connection_for_address(addr); 847 if (packet[3]){ 848 if (conn){ 849 // outgoing connection failed, remove entry 850 linked_list_remove(&hci_stack->connections, (linked_item_t *) conn); 851 btstack_memory_hci_connection_free( conn ); 852 853 } 854 // if authentication error, also delete link key 855 if (packet[3] == 0x05) { 856 hci_drop_link_key_for_bd_addr(&addr); 857 } 858 break; 859 } 860 if (!conn){ 861 conn = create_connection_for_addr(addr); 862 } 863 if (!conn){ 864 // no memory 865 break; 866 } 867 868 conn->state = OPEN; 869 conn->con_handle = READ_BT_16(packet, 4); 870 871 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 872 873 // restart timer 874 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 875 // run_loop_add_timer(&conn->timeout); 876 877 log_info("New connection: handle %u, %s\n", conn->con_handle, bd_addr_to_str(conn->address)); 878 879 hci_emit_nr_connections_changed(); 880 break; 881 882 // printf("LE buffer size: %u, count %u\n", READ_BT_16(packet,6), packet[8]); 883 884 default: 885 break; 886 } 887 break; 888 #endif 889 890 default: 891 break; 892 } 893 894 // handle BT initialization 895 if (hci_stack->state == HCI_STATE_INITIALIZING){ 896 if (hci_stack->substate % 2){ 897 // odd: waiting for event 898 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE || packet[0] == HCI_EVENT_COMMAND_STATUS){ 899 // wait for explicit COMMAND COMPLETE on RESET 900 if (hci_stack->substate > 1 || COMMAND_COMPLETE_EVENT(packet, hci_reset)) { 901 hci_stack->substate++; 902 } 903 } 904 } 905 } 906 907 // help with BT sleep 908 if (hci_stack->state == HCI_STATE_FALLING_ASLEEP 909 && hci_stack->substate == 1 910 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 911 hci_stack->substate++; 912 } 913 914 hci_stack->packet_handler(HCI_EVENT_PACKET, packet, size); 915 916 // execute main loop 917 hci_run(); 918 } 919 920 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 921 switch (packet_type) { 922 case HCI_EVENT_PACKET: 923 event_handler(packet, size); 924 break; 925 case HCI_ACL_DATA_PACKET: 926 acl_handler(packet, size); 927 break; 928 default: 929 break; 930 } 931 } 932 933 /** Register HCI packet handlers */ 934 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 935 hci_stack->packet_handler = handler; 936 } 937 938 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 939 940 #ifdef HAVE_MALLOC 941 if (!hci_stack) { 942 hci_stack = (hci_stack_t*) malloc(sizeof(hci_stack_t)); 943 } 944 #else 945 hci_stack = &hci_stack_static; 946 #endif 947 memset(hci_stack, 0, sizeof(hci_stack_t)); 948 949 // reference to use transport layer implementation 950 hci_stack->hci_transport = transport; 951 952 // references to used control implementation 953 hci_stack->control = control; 954 955 // reference to used config 956 hci_stack->config = config; 957 958 // no connections yet 959 hci_stack->connections = NULL; 960 hci_stack->discoverable = 0; 961 hci_stack->connectable = 0; 962 hci_stack->bondable = 1; 963 964 // no pending cmds 965 hci_stack->decline_reason = 0; 966 hci_stack->new_scan_enable_value = 0xff; 967 968 // higher level handler 969 hci_stack->packet_handler = dummy_handler; 970 971 // store and open remote device db 972 hci_stack->remote_device_db = remote_device_db; 973 if (hci_stack->remote_device_db) { 974 hci_stack->remote_device_db->open(); 975 } 976 977 // max acl payload size defined in config.h 978 hci_stack->acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 979 980 // register packet handlers with transport 981 transport->register_packet_handler(&packet_handler); 982 983 hci_stack->state = HCI_STATE_OFF; 984 985 // class of device 986 hci_stack->class_of_device = 0x007a020c; // Smartphone 987 988 // Secure Simple Pairing default: enable, no I/O capabilities, general bonding, mitm not required, auto accept 989 hci_stack->ssp_enable = 1; 990 hci_stack->ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 991 hci_stack->ssp_authentication_requirement = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING; 992 hci_stack->ssp_auto_accept = 1; 993 994 // LE 995 hci_stack->adv_addr_type = 0; 996 memset(hci_stack->adv_address, 0, 6); 997 } 998 999 void hci_close(){ 1000 // close remote device db 1001 if (hci_stack->remote_device_db) { 1002 hci_stack->remote_device_db->close(); 1003 } 1004 while (hci_stack->connections) { 1005 hci_shutdown_connection((hci_connection_t *) hci_stack->connections); 1006 } 1007 hci_power_control(HCI_POWER_OFF); 1008 1009 #ifdef HAVE_MALLOC 1010 free(hci_stack); 1011 #endif 1012 hci_stack = NULL; 1013 } 1014 1015 void hci_set_class_of_device(uint32_t class_of_device){ 1016 hci_stack->class_of_device = class_of_device; 1017 } 1018 1019 void hci_disable_l2cap_timeout_check(){ 1020 disable_l2cap_timeouts = 1; 1021 } 1022 // State-Module-Driver overview 1023 // state module low-level 1024 // HCI_STATE_OFF off close 1025 // HCI_STATE_INITIALIZING, on open 1026 // HCI_STATE_WORKING, on open 1027 // HCI_STATE_HALTING, on open 1028 // HCI_STATE_SLEEPING, off/sleep close 1029 // HCI_STATE_FALLING_ASLEEP on open 1030 1031 static int hci_power_control_on(void){ 1032 1033 // power on 1034 int err = 0; 1035 if (hci_stack->control && hci_stack->control->on){ 1036 err = (*hci_stack->control->on)(hci_stack->config); 1037 } 1038 if (err){ 1039 log_error( "POWER_ON failed\n"); 1040 hci_emit_hci_open_failed(); 1041 return err; 1042 } 1043 1044 // open low-level device 1045 err = hci_stack->hci_transport->open(hci_stack->config); 1046 if (err){ 1047 log_error( "HCI_INIT failed, turning Bluetooth off again\n"); 1048 if (hci_stack->control && hci_stack->control->off){ 1049 (*hci_stack->control->off)(hci_stack->config); 1050 } 1051 hci_emit_hci_open_failed(); 1052 return err; 1053 } 1054 return 0; 1055 } 1056 1057 static void hci_power_control_off(void){ 1058 1059 log_info("hci_power_control_off\n"); 1060 1061 // close low-level device 1062 hci_stack->hci_transport->close(hci_stack->config); 1063 1064 log_info("hci_power_control_off - hci_transport closed\n"); 1065 1066 // power off 1067 if (hci_stack->control && hci_stack->control->off){ 1068 (*hci_stack->control->off)(hci_stack->config); 1069 } 1070 1071 log_info("hci_power_control_off - control closed\n"); 1072 1073 hci_stack->state = HCI_STATE_OFF; 1074 } 1075 1076 static void hci_power_control_sleep(void){ 1077 1078 log_info("hci_power_control_sleep\n"); 1079 1080 #if 0 1081 // don't close serial port during sleep 1082 1083 // close low-level device 1084 hci_stack->hci_transport->close(hci_stack->config); 1085 #endif 1086 1087 // sleep mode 1088 if (hci_stack->control && hci_stack->control->sleep){ 1089 (*hci_stack->control->sleep)(hci_stack->config); 1090 } 1091 1092 hci_stack->state = HCI_STATE_SLEEPING; 1093 } 1094 1095 static int hci_power_control_wake(void){ 1096 1097 log_info("hci_power_control_wake\n"); 1098 1099 // wake on 1100 if (hci_stack->control && hci_stack->control->wake){ 1101 (*hci_stack->control->wake)(hci_stack->config); 1102 } 1103 1104 #if 0 1105 // open low-level device 1106 int err = hci_stack->hci_transport->open(hci_stack->config); 1107 if (err){ 1108 log_error( "HCI_INIT failed, turning Bluetooth off again\n"); 1109 if (hci_stack->control && hci_stack->control->off){ 1110 (*hci_stack->control->off)(hci_stack->config); 1111 } 1112 hci_emit_hci_open_failed(); 1113 return err; 1114 } 1115 #endif 1116 1117 return 0; 1118 } 1119 1120 1121 int hci_power_control(HCI_POWER_MODE power_mode){ 1122 1123 log_info("hci_power_control: %u, current mode %u\n", power_mode, hci_stack->state); 1124 1125 int err = 0; 1126 switch (hci_stack->state){ 1127 1128 case HCI_STATE_OFF: 1129 switch (power_mode){ 1130 case HCI_POWER_ON: 1131 err = hci_power_control_on(); 1132 if (err) return err; 1133 // set up state machine 1134 hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent 1135 hci_stack->state = HCI_STATE_INITIALIZING; 1136 hci_stack->substate = 0; 1137 break; 1138 case HCI_POWER_OFF: 1139 // do nothing 1140 break; 1141 case HCI_POWER_SLEEP: 1142 // do nothing (with SLEEP == OFF) 1143 break; 1144 } 1145 break; 1146 1147 case HCI_STATE_INITIALIZING: 1148 switch (power_mode){ 1149 case HCI_POWER_ON: 1150 // do nothing 1151 break; 1152 case HCI_POWER_OFF: 1153 // no connections yet, just turn it off 1154 hci_power_control_off(); 1155 break; 1156 case HCI_POWER_SLEEP: 1157 // no connections yet, just turn it off 1158 hci_power_control_sleep(); 1159 break; 1160 } 1161 break; 1162 1163 case HCI_STATE_WORKING: 1164 switch (power_mode){ 1165 case HCI_POWER_ON: 1166 // do nothing 1167 break; 1168 case HCI_POWER_OFF: 1169 // see hci_run 1170 hci_stack->state = HCI_STATE_HALTING; 1171 break; 1172 case HCI_POWER_SLEEP: 1173 // see hci_run 1174 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1175 hci_stack->substate = 0; 1176 break; 1177 } 1178 break; 1179 1180 case HCI_STATE_HALTING: 1181 switch (power_mode){ 1182 case HCI_POWER_ON: 1183 // set up state machine 1184 hci_stack->state = HCI_STATE_INITIALIZING; 1185 hci_stack->substate = 0; 1186 break; 1187 case HCI_POWER_OFF: 1188 // do nothing 1189 break; 1190 case HCI_POWER_SLEEP: 1191 // see hci_run 1192 hci_stack->state = HCI_STATE_FALLING_ASLEEP; 1193 hci_stack->substate = 0; 1194 break; 1195 } 1196 break; 1197 1198 case HCI_STATE_FALLING_ASLEEP: 1199 switch (power_mode){ 1200 case HCI_POWER_ON: 1201 1202 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1203 // nothing to do, if H4 supports power management 1204 if (bt_control_iphone_power_management_enabled()){ 1205 hci_stack->state = HCI_STATE_INITIALIZING; 1206 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1207 break; 1208 } 1209 #endif 1210 // set up state machine 1211 hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent 1212 hci_stack->state = HCI_STATE_INITIALIZING; 1213 hci_stack->substate = 0; 1214 break; 1215 case HCI_POWER_OFF: 1216 // see hci_run 1217 hci_stack->state = HCI_STATE_HALTING; 1218 break; 1219 case HCI_POWER_SLEEP: 1220 // do nothing 1221 break; 1222 } 1223 break; 1224 1225 case HCI_STATE_SLEEPING: 1226 switch (power_mode){ 1227 case HCI_POWER_ON: 1228 1229 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1230 // nothing to do, if H4 supports power management 1231 if (bt_control_iphone_power_management_enabled()){ 1232 hci_stack->state = HCI_STATE_INITIALIZING; 1233 hci_stack->substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1234 hci_update_scan_enable(); 1235 break; 1236 } 1237 #endif 1238 err = hci_power_control_wake(); 1239 if (err) return err; 1240 // set up state machine 1241 hci_stack->num_cmd_packets = 1; // assume that one cmd can be sent 1242 hci_stack->state = HCI_STATE_INITIALIZING; 1243 hci_stack->substate = 0; 1244 break; 1245 case HCI_POWER_OFF: 1246 hci_stack->state = HCI_STATE_HALTING; 1247 break; 1248 case HCI_POWER_SLEEP: 1249 // do nothing 1250 break; 1251 } 1252 break; 1253 } 1254 1255 // create internal event 1256 hci_emit_state(); 1257 1258 // trigger next/first action 1259 hci_run(); 1260 1261 return 0; 1262 } 1263 1264 static void hci_update_scan_enable(void){ 1265 // 2 = page scan, 1 = inq scan 1266 hci_stack->new_scan_enable_value = hci_stack->connectable << 1 | hci_stack->discoverable; 1267 hci_run(); 1268 } 1269 1270 void hci_discoverable_control(uint8_t enable){ 1271 if (enable) enable = 1; // normalize argument 1272 1273 if (hci_stack->discoverable == enable){ 1274 hci_emit_discoverable_enabled(hci_stack->discoverable); 1275 return; 1276 } 1277 1278 hci_stack->discoverable = enable; 1279 hci_update_scan_enable(); 1280 } 1281 1282 void hci_connectable_control(uint8_t enable){ 1283 if (enable) enable = 1; // normalize argument 1284 1285 // don't emit event 1286 if (hci_stack->connectable == enable) return; 1287 1288 hci_stack->connectable = enable; 1289 hci_update_scan_enable(); 1290 } 1291 1292 bd_addr_t * hci_local_bd_addr(void){ 1293 return &hci_stack->local_bd_addr; 1294 } 1295 1296 void hci_run(){ 1297 1298 hci_connection_t * connection; 1299 linked_item_t * it; 1300 1301 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1302 1303 // global/non-connection oriented commands 1304 1305 // decline incoming connections 1306 if (hci_stack->decline_reason){ 1307 uint8_t reason = hci_stack->decline_reason; 1308 hci_stack->decline_reason = 0; 1309 hci_send_cmd(&hci_reject_connection_request, hci_stack->decline_addr, reason); 1310 return; 1311 } 1312 1313 // send scan enable 1314 if (hci_stack->state == HCI_STATE_WORKING && hci_stack->new_scan_enable_value != 0xff && hci_classic_supported()){ 1315 hci_send_cmd(&hci_write_scan_enable, hci_stack->new_scan_enable_value); 1316 hci_stack->new_scan_enable_value = 0xff; 1317 return; 1318 } 1319 1320 // send pending HCI commands 1321 for (it = (linked_item_t *) hci_stack->connections; it ; it = it->next){ 1322 1323 connection = (hci_connection_t *) it; 1324 1325 if (connection->state == SEND_CREATE_CONNECTION){ 1326 log_info("sending hci_create_connection\n"); 1327 hci_send_cmd(&hci_create_connection, connection->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 1328 return; 1329 } 1330 1331 if (connection->state == RECEIVED_CONNECTION_REQUEST){ 1332 log_info("sending hci_accept_connection_request\n"); 1333 connection->state = ACCEPTED_CONNECTION_REQUEST; 1334 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 1335 return; 1336 } 1337 1338 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 1339 log_info("responding to link key request\n"); 1340 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 1341 link_key_t link_key; 1342 link_key_type_t link_key_type; 1343 if ( hci_stack->remote_device_db 1344 && hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type) 1345 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 1346 connection->link_key_type = link_key_type; 1347 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 1348 } else { 1349 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 1350 } 1351 return; 1352 } 1353 1354 if (connection->authentication_flags & DENY_PIN_CODE_REQUEST){ 1355 log_info("denying to pin request\n"); 1356 connectionClearAuthenticationFlags(connection, DENY_PIN_CODE_REQUEST); 1357 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 1358 return; 1359 } 1360 1361 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 1362 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 1363 log_info("IO Capability Request received, stack bondable %u, io cap %u", hci_stack->bondable, hci_stack->ssp_io_capability); 1364 if (hci_stack->bondable && (hci_stack->ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN)){ 1365 // tweak authentication requirements 1366 uint8_t authreq = hci_stack->ssp_authentication_requirement; 1367 if (connection->bonding_flags & BONDING_DEDICATED){ 1368 authreq = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING; 1369 } 1370 if (gap_mitm_protection_required_for_security_level(connection->requested_security_level)){ 1371 authreq |= 1; 1372 } 1373 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack->ssp_io_capability, NULL, authreq); 1374 } else { 1375 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 1376 } 1377 return; 1378 } 1379 1380 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 1381 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 1382 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 1383 return; 1384 } 1385 1386 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 1387 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 1388 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 1389 return; 1390 } 1391 1392 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 1393 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 1394 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 1395 return; 1396 } 1397 1398 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 1399 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 1400 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 1401 return; 1402 } 1403 if (connection->bonding_flags & BONDING_DISCONNECT_DEDICATED_DONE){ 1404 connection->bonding_flags &= ~BONDING_DISCONNECT_DEDICATED_DONE; 1405 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // authentication done 1406 return; 1407 } 1408 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 1409 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 1410 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 1411 return; 1412 } 1413 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 1414 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 1415 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 1416 return; 1417 } 1418 } 1419 1420 switch (hci_stack->state){ 1421 case HCI_STATE_INITIALIZING: 1422 // log_info("hci_init: substate %u\n", hci_stack->substate); 1423 if (hci_stack->substate % 2) { 1424 // odd: waiting for command completion 1425 return; 1426 } 1427 switch (hci_stack->substate >> 1){ 1428 case 0: // RESET 1429 hci_send_cmd(&hci_reset); 1430 1431 if (hci_stack->config == 0 || ((hci_uart_config_t *)hci_stack->config)->baudrate_main == 0){ 1432 // skip baud change 1433 hci_stack->substate = 4; // >> 1 = 2 1434 } 1435 break; 1436 case 1: // SEND BAUD CHANGE 1437 hci_stack->control->baudrate_cmd(hci_stack->config, ((hci_uart_config_t *)hci_stack->config)->baudrate_main, hci_stack->hci_packet_buffer); 1438 hci_send_cmd_packet(hci_stack->hci_packet_buffer, 3 + hci_stack->hci_packet_buffer[2]); 1439 break; 1440 case 2: // LOCAL BAUD CHANGE 1441 hci_stack->hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack->config)->baudrate_main); 1442 hci_stack->substate += 2; 1443 // break missing here for fall through 1444 1445 case 3: 1446 // Custom initialization 1447 if (hci_stack->control && hci_stack->control->next_cmd){ 1448 int valid_cmd = (*hci_stack->control->next_cmd)(hci_stack->config, hci_stack->hci_packet_buffer); 1449 if (valid_cmd){ 1450 int size = 3 + hci_stack->hci_packet_buffer[2]; 1451 hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack->hci_packet_buffer, size); 1452 hci_stack->substate = 4; // more init commands 1453 break; 1454 } 1455 log_info("hci_run: init script done\n\r"); 1456 } 1457 // otherwise continue 1458 hci_send_cmd(&hci_read_bd_addr); 1459 break; 1460 case 4: 1461 hci_send_cmd(&hci_read_buffer_size); 1462 break; 1463 case 5: 1464 hci_send_cmd(&hci_read_local_supported_features); 1465 break; 1466 case 6: 1467 if (hci_le_supported()){ 1468 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 1469 } else { 1470 // Kensington Bluetoot 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 1471 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 1472 } 1473 1474 // skip Classic init commands for LE only chipsets 1475 if (!hci_classic_supported()){ 1476 if (hci_le_supported()){ 1477 hci_stack->substate = 11 << 1; // skip all classic command 1478 } else { 1479 log_error("Neither BR/EDR nor LE supported"); 1480 hci_stack->substate = 13 << 1; // skip all 1481 } 1482 } 1483 break; 1484 case 7: 1485 if (hci_ssp_supported()){ 1486 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack->ssp_enable); 1487 break; 1488 } 1489 hci_stack->substate += 2; 1490 // break missing here for fall through 1491 1492 case 8: 1493 // ca. 15 sec 1494 hci_send_cmd(&hci_write_page_timeout, 0x6000); 1495 break; 1496 case 9: 1497 hci_send_cmd(&hci_write_class_of_device, hci_stack->class_of_device); 1498 break; 1499 case 10: 1500 if (hci_stack->local_name){ 1501 hci_send_cmd(&hci_write_local_name, hci_stack->local_name); 1502 } else { 1503 char hostname[30]; 1504 #ifdef EMBEDDED 1505 // BTstack-11:22:33:44:55:66 1506 strcpy(hostname, "BTstack "); 1507 strcat(hostname, bd_addr_to_str(hci_stack->local_bd_addr)); 1508 printf("---> Name %s\n", hostname); 1509 #else 1510 // hostname for POSIX systems 1511 gethostname(hostname, 30); 1512 hostname[29] = '\0'; 1513 #endif 1514 hci_send_cmd(&hci_write_local_name, hostname); 1515 } 1516 break; 1517 case 11: 1518 hci_send_cmd(&hci_write_scan_enable, (hci_stack->connectable << 1) | hci_stack->discoverable); // page scan 1519 if (!hci_le_supported()){ 1520 // SKIP LE init for Classic only configuration 1521 hci_stack->substate = 13 << 1; 1522 } 1523 break; 1524 1525 #ifdef HAVE_BLE 1526 // LE INIT 1527 case 12: 1528 hci_send_cmd(&hci_le_read_buffer_size); 1529 break; 1530 case 13: 1531 // LE Supported Host = 1, Simultaneous Host = 0 1532 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 1533 break; 1534 #endif 1535 1536 // DONE 1537 case 14: 1538 // done. 1539 hci_stack->state = HCI_STATE_WORKING; 1540 hci_emit_state(); 1541 break; 1542 default: 1543 break; 1544 } 1545 hci_stack->substate++; 1546 break; 1547 1548 case HCI_STATE_HALTING: 1549 1550 log_info("HCI_STATE_HALTING\n"); 1551 // close all open connections 1552 connection = (hci_connection_t *) hci_stack->connections; 1553 if (connection){ 1554 1555 // send disconnect 1556 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1557 1558 log_info("HCI_STATE_HALTING, connection %p, handle %u\n", connection, (uint16_t)connection->con_handle); 1559 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1560 1561 // send disconnected event right away - causes higher layer connections to get closed, too. 1562 hci_shutdown_connection(connection); 1563 return; 1564 } 1565 log_info("HCI_STATE_HALTING, calling off\n"); 1566 1567 // switch mode 1568 hci_power_control_off(); 1569 1570 log_info("HCI_STATE_HALTING, emitting state\n"); 1571 hci_emit_state(); 1572 log_info("HCI_STATE_HALTING, done\n"); 1573 break; 1574 1575 case HCI_STATE_FALLING_ASLEEP: 1576 switch(hci_stack->substate) { 1577 case 0: 1578 log_info("HCI_STATE_FALLING_ASLEEP\n"); 1579 // close all open connections 1580 connection = (hci_connection_t *) hci_stack->connections; 1581 1582 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1583 // don't close connections, if H4 supports power management 1584 if (bt_control_iphone_power_management_enabled()){ 1585 connection = NULL; 1586 } 1587 #endif 1588 if (connection){ 1589 1590 // send disconnect 1591 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1592 1593 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u\n", connection, (uint16_t)connection->con_handle); 1594 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1595 1596 // send disconnected event right away - causes higher layer connections to get closed, too. 1597 hci_shutdown_connection(connection); 1598 return; 1599 } 1600 1601 if (hci_classic_supported()){ 1602 // disable page and inquiry scan 1603 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1604 1605 log_info("HCI_STATE_HALTING, disabling inq scans\n"); 1606 hci_send_cmd(&hci_write_scan_enable, hci_stack->connectable << 1); // drop inquiry scan but keep page scan 1607 1608 // continue in next sub state 1609 hci_stack->substate++; 1610 break; 1611 } 1612 // fall through for ble-only chips 1613 1614 case 2: 1615 log_info("HCI_STATE_HALTING, calling sleep\n"); 1616 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1617 // don't actually go to sleep, if H4 supports power management 1618 if (bt_control_iphone_power_management_enabled()){ 1619 // SLEEP MODE reached 1620 hci_stack->state = HCI_STATE_SLEEPING; 1621 hci_emit_state(); 1622 break; 1623 } 1624 #endif 1625 // switch mode 1626 hci_power_control_sleep(); // changes hci_stack->state to SLEEP 1627 hci_emit_state(); 1628 break; 1629 1630 default: 1631 break; 1632 } 1633 break; 1634 1635 default: 1636 break; 1637 } 1638 } 1639 1640 int hci_send_cmd_packet(uint8_t *packet, int size){ 1641 bd_addr_t addr; 1642 hci_connection_t * conn; 1643 // house-keeping 1644 1645 // create_connection? 1646 if (IS_COMMAND(packet, hci_create_connection)){ 1647 bt_flip_addr(addr, &packet[3]); 1648 log_info("Create_connection to %s\n", bd_addr_to_str(addr)); 1649 1650 conn = connection_for_address(addr); 1651 if (!conn){ 1652 conn = create_connection_for_addr(addr); 1653 if (!conn){ 1654 // notify client that alloc failed 1655 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 1656 return 0; // don't sent packet to controller 1657 } 1658 conn->state = SEND_CREATE_CONNECTION; 1659 } 1660 log_info("conn state %u", conn->state); 1661 switch (conn->state){ 1662 // if connection active exists 1663 case OPEN: 1664 // and OPEN, emit connection complete command, don't send to controller 1665 hci_emit_connection_complete(conn, 0); 1666 return 0; 1667 case SEND_CREATE_CONNECTION: 1668 // connection created by hci, e.g. dedicated bonding 1669 break; 1670 default: 1671 // otherwise, just ignore as it is already in the open process 1672 return 0; 1673 } 1674 conn->state = SENT_CREATE_CONNECTION; 1675 } 1676 1677 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 1678 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 1679 } 1680 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 1681 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 1682 } 1683 1684 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 1685 if (hci_stack->remote_device_db){ 1686 bt_flip_addr(addr, &packet[3]); 1687 hci_stack->remote_device_db->delete_link_key(&addr); 1688 } 1689 } 1690 1691 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply) 1692 || IS_COMMAND(packet, hci_pin_code_request_reply)){ 1693 bt_flip_addr(addr, &packet[3]); 1694 conn = connection_for_address(addr); 1695 if (conn){ 1696 connectionClearAuthenticationFlags(conn, LEGACY_PAIRING_ACTIVE); 1697 } 1698 } 1699 1700 if (IS_COMMAND(packet, hci_user_confirmation_request_negative_reply) 1701 || IS_COMMAND(packet, hci_user_confirmation_request_reply) 1702 || IS_COMMAND(packet, hci_user_passkey_request_negative_reply) 1703 || IS_COMMAND(packet, hci_user_passkey_request_reply)) { 1704 bt_flip_addr(addr, &packet[3]); 1705 conn = connection_for_address(addr); 1706 if (conn){ 1707 connectionClearAuthenticationFlags(conn, SSP_PAIRING_ACTIVE); 1708 } 1709 } 1710 1711 #ifdef HAVE_BLE 1712 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 1713 hci_stack->adv_addr_type = packet[8]; 1714 } 1715 if (IS_COMMAND(packet, hci_le_set_random_address)){ 1716 bt_flip_addr(hci_stack->adv_address, &packet[3]); 1717 } 1718 #endif 1719 1720 hci_stack->num_cmd_packets--; 1721 int err = hci_stack->hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 1722 1723 // free packet buffer for synchronous transport implementations 1724 if (hci_transport_synchronous()){ 1725 hci_stack->hci_packet_buffer_reserved = 0; 1726 } 1727 1728 return err; 1729 } 1730 1731 // disconnect because of security block 1732 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 1733 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1734 if (!connection) return; 1735 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 1736 } 1737 1738 1739 // Configure Secure Simple Pairing 1740 1741 // enable will enable SSP during init 1742 void hci_ssp_set_enable(int enable){ 1743 hci_stack->ssp_enable = enable; 1744 } 1745 1746 int hci_local_ssp_activated(){ 1747 return hci_ssp_supported() && hci_stack->ssp_enable; 1748 } 1749 1750 // if set, BTstack will respond to io capability request using authentication requirement 1751 void hci_ssp_set_io_capability(int io_capability){ 1752 hci_stack->ssp_io_capability = io_capability; 1753 } 1754 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 1755 hci_stack->ssp_authentication_requirement = authentication_requirement; 1756 } 1757 1758 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 1759 void hci_ssp_set_auto_accept(int auto_accept){ 1760 hci_stack->ssp_auto_accept = auto_accept; 1761 } 1762 1763 /** 1764 * pre: numcmds >= 0 - it's allowed to send a command to the controller 1765 */ 1766 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 1767 va_list argptr; 1768 va_start(argptr, cmd); 1769 uint16_t size = hci_create_cmd_internal(hci_stack->hci_packet_buffer, cmd, argptr); 1770 va_end(argptr); 1771 return hci_send_cmd_packet(hci_stack->hci_packet_buffer, size); 1772 } 1773 1774 // Create various non-HCI events. 1775 // TODO: generalize, use table similar to hci_create_command 1776 1777 void hci_emit_state(){ 1778 log_info("BTSTACK_EVENT_STATE %u", hci_stack->state); 1779 uint8_t event[3]; 1780 event[0] = BTSTACK_EVENT_STATE; 1781 event[1] = sizeof(event) - 2; 1782 event[2] = hci_stack->state; 1783 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1784 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1785 } 1786 1787 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 1788 uint8_t event[13]; 1789 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 1790 event[1] = sizeof(event) - 2; 1791 event[2] = status; 1792 bt_store_16(event, 3, conn->con_handle); 1793 bt_flip_addr(&event[5], conn->address); 1794 event[11] = 1; // ACL connection 1795 event[12] = 0; // encryption disabled 1796 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1797 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1798 } 1799 1800 void hci_emit_disconnection_complete(uint16_t handle, uint8_t reason){ 1801 uint8_t event[6]; 1802 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 1803 event[1] = sizeof(event) - 2; 1804 event[2] = 0; // status = OK 1805 bt_store_16(event, 3, handle); 1806 event[5] = reason; 1807 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1808 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1809 } 1810 1811 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 1812 if (disable_l2cap_timeouts) return; 1813 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 1814 uint8_t event[4]; 1815 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 1816 event[1] = sizeof(event) - 2; 1817 bt_store_16(event, 2, conn->con_handle); 1818 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1819 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1820 } 1821 1822 void hci_emit_nr_connections_changed(){ 1823 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 1824 uint8_t event[3]; 1825 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 1826 event[1] = sizeof(event) - 2; 1827 event[2] = nr_hci_connections(); 1828 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1829 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1830 } 1831 1832 void hci_emit_hci_open_failed(){ 1833 log_info("BTSTACK_EVENT_POWERON_FAILED"); 1834 uint8_t event[2]; 1835 event[0] = BTSTACK_EVENT_POWERON_FAILED; 1836 event[1] = sizeof(event) - 2; 1837 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1838 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1839 } 1840 1841 #ifndef EMBEDDED 1842 void hci_emit_btstack_version() { 1843 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 1844 uint8_t event[6]; 1845 event[0] = BTSTACK_EVENT_VERSION; 1846 event[1] = sizeof(event) - 2; 1847 event[2] = BTSTACK_MAJOR; 1848 event[3] = BTSTACK_MINOR; 1849 bt_store_16(event, 4, BTSTACK_REVISION); 1850 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1851 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1852 } 1853 #endif 1854 1855 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 1856 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 1857 uint8_t event[3]; 1858 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 1859 event[1] = sizeof(event) - 2; 1860 event[2] = enabled; 1861 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1862 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1863 } 1864 1865 void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){ 1866 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 1867 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 1868 event[1] = sizeof(event) - 2 - 1; 1869 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 1870 bt_flip_addr(&event[3], *addr); 1871 memcpy(&event[9], name, 248); 1872 1873 event[9+248] = 0; // assert \0 for log_info 1874 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(*addr), &event[9]); 1875 1876 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 1877 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 1878 } 1879 1880 void hci_emit_discoverable_enabled(uint8_t enabled){ 1881 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 1882 uint8_t event[3]; 1883 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 1884 event[1] = sizeof(event) - 2; 1885 event[2] = enabled; 1886 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1887 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1888 } 1889 1890 void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){ 1891 log_info("hci_emit_security_level %u for handle %x", level, con_handle); 1892 uint8_t event[5]; 1893 int pos = 0; 1894 event[pos++] = GAP_SECURITY_LEVEL; 1895 event[pos++] = sizeof(event) - 2; 1896 bt_store_16(event, 2, con_handle); 1897 pos += 2; 1898 event[pos++] = level; 1899 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1900 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1901 } 1902 1903 void hci_emit_dedicated_bonding_result(hci_connection_t * connection, uint8_t status){ 1904 log_info("hci_emit_dedicated_bonding_result %u ", status); 1905 uint8_t event[9]; 1906 int pos = 0; 1907 event[pos++] = GAP_DEDICATED_BONDING_COMPLETED; 1908 event[pos++] = sizeof(event) - 2; 1909 event[pos++] = status; 1910 bt_flip_addr( * (bd_addr_t *) &event[pos], connection->address); 1911 pos += 6; 1912 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1913 hci_stack->packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1914 } 1915 1916 // query if remote side supports SSP 1917 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 1918 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1919 if (!connection) return 0; 1920 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 1921 } 1922 1923 int hci_ssp_supported_on_both_sides(hci_con_handle_t handle){ 1924 return hci_local_ssp_activated() && hci_remote_ssp_supported(handle); 1925 } 1926 1927 // GAP API 1928 /** 1929 * @bbrief enable/disable bonding. default is enabled 1930 * @praram enabled 1931 */ 1932 void gap_set_bondable_mode(int enable){ 1933 hci_stack->bondable = enable ? 1 : 0; 1934 } 1935 1936 /** 1937 * @brief map link keys to security levels 1938 */ 1939 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 1940 switch (link_key_type){ 1941 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 1942 return LEVEL_4; 1943 case COMBINATION_KEY: 1944 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 1945 return LEVEL_3; 1946 default: 1947 return LEVEL_2; 1948 } 1949 } 1950 1951 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 1952 if (!connection) return LEVEL_0; 1953 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 1954 return gap_security_level_for_link_key_type(connection->link_key_type); 1955 } 1956 1957 1958 int gap_mitm_protection_required_for_security_level(gap_security_level_t level){ 1959 printf("gap_mitm_protection_required_for_security_level %u\n", level); 1960 return level > LEVEL_2; 1961 } 1962 1963 /** 1964 * @brief get current security level 1965 */ 1966 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 1967 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1968 if (!connection) return LEVEL_0; 1969 return gap_security_level_for_connection(connection); 1970 } 1971 1972 /** 1973 * @brief request connection to device to 1974 * @result GAP_AUTHENTICATION_RESULT 1975 */ 1976 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 1977 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1978 if (!connection){ 1979 hci_emit_security_level(con_handle, LEVEL_0); 1980 return; 1981 } 1982 gap_security_level_t current_level = gap_security_level(con_handle); 1983 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 1984 if (current_level >= requested_level){ 1985 hci_emit_security_level(con_handle, current_level); 1986 return; 1987 } 1988 1989 connection->requested_security_level = requested_level; 1990 1991 // would enabling ecnryption suffice (>= LEVEL_2)? 1992 if (hci_stack->remote_device_db){ 1993 link_key_type_t link_key_type; 1994 link_key_t link_key; 1995 if (hci_stack->remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type)){ 1996 if (gap_security_level_for_link_key_type(link_key_type) >= requested_level){ 1997 connection->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 1998 return; 1999 } 2000 } 2001 } 2002 2003 // try to authenticate connection 2004 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 2005 hci_run(); 2006 } 2007 2008 /** 2009 * @brief start dedicated bonding with device. disconnect after bonding 2010 * @param device 2011 * @param request MITM protection 2012 * @result GAP_DEDICATED_BONDING_COMPLETE 2013 */ 2014 int gap_dedicated_bonding(bd_addr_t device, int mitm_protection_required){ 2015 2016 // create connection state machine 2017 hci_connection_t * connection = create_connection_for_addr(device); 2018 2019 if (!connection){ 2020 return BTSTACK_MEMORY_ALLOC_FAILED; 2021 } 2022 2023 // delete linkn key 2024 hci_drop_link_key_for_bd_addr( (bd_addr_t *) &device); 2025 2026 // configure LEVEL_2/3, dedicated bonding 2027 connection->state = SEND_CREATE_CONNECTION; 2028 connection->requested_security_level = mitm_protection_required ? LEVEL_3 : LEVEL_2; 2029 printf("gap_dedicated_bonding, mitm %u -> level %u\n", mitm_protection_required, connection->requested_security_level); 2030 connection->bonding_flags = BONDING_DEDICATED; 2031 2032 // wait for GAP Security Result and send GAP Dedicated Bonding complete 2033 2034 // handle: connnection failure (connection complete != ok) 2035 // handle: authentication failure 2036 // handle: disconnect on done 2037 2038 hci_run(); 2039 2040 return 0; 2041 } 2042 2043 void gap_set_local_name(const char * local_name){ 2044 hci_stack->local_name = local_name; 2045 } 2046 2047 2048