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