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