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 74 // the STACK is here 75 static hci_stack_t hci_stack; 76 77 /** 78 * get connection for a given handle 79 * 80 * @return connection OR NULL, if not found 81 */ 82 hci_connection_t * hci_connection_for_handle(hci_con_handle_t con_handle){ 83 linked_item_t *it; 84 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 85 if ( ((hci_connection_t *) it)->con_handle == con_handle){ 86 return (hci_connection_t *) it; 87 } 88 } 89 return NULL; 90 } 91 92 static void hci_connection_timeout_handler(timer_source_t *timer){ 93 hci_connection_t * connection = (hci_connection_t *) linked_item_get_user(&timer->item); 94 #ifdef HAVE_TIME 95 struct timeval tv; 96 gettimeofday(&tv, NULL); 97 if (tv.tv_sec >= connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000) { 98 // connections might be timed out 99 hci_emit_l2cap_check_timeout(connection); 100 } 101 #endif 102 #ifdef HAVE_TICK 103 if (embedded_get_ticks() > connection->timestamp + embedded_ticks_for_ms(HCI_CONNECTION_TIMEOUT_MS)){ 104 // connections might be timed out 105 hci_emit_l2cap_check_timeout(connection); 106 } 107 #endif 108 run_loop_set_timer(timer, HCI_CONNECTION_TIMEOUT_MS); 109 run_loop_add_timer(timer); 110 } 111 112 static void hci_connection_timestamp(hci_connection_t *connection){ 113 #ifdef HAVE_TIME 114 gettimeofday(&connection->timestamp, NULL); 115 #endif 116 #ifdef HAVE_TICK 117 connection->timestamp = embedded_get_ticks(); 118 #endif 119 } 120 121 /** 122 * create connection for given address 123 * 124 * @return connection OR NULL, if no memory left 125 */ 126 static hci_connection_t * create_connection_for_addr(bd_addr_t addr){ 127 hci_connection_t * conn = (hci_connection_t *) btstack_memory_hci_connection_get(); 128 if (!conn) return NULL; 129 BD_ADDR_COPY(conn->address, addr); 130 conn->con_handle = 0xffff; 131 conn->authentication_flags = AUTH_FLAGS_NONE; 132 conn->bonding_flags = 0; 133 conn->requested_security_level = LEVEL_0; 134 linked_item_set_user(&conn->timeout.item, conn); 135 conn->timeout.process = hci_connection_timeout_handler; 136 hci_connection_timestamp(conn); 137 conn->acl_recombination_length = 0; 138 conn->acl_recombination_pos = 0; 139 conn->num_acl_packets_sent = 0; 140 linked_list_add(&hci_stack.connections, (linked_item_t *) conn); 141 return conn; 142 } 143 144 /** 145 * get connection for given address 146 * 147 * @return connection OR NULL, if not found 148 */ 149 static hci_connection_t * connection_for_address(bd_addr_t address){ 150 linked_item_t *it; 151 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 152 if ( ! BD_ADDR_CMP( ((hci_connection_t *) it)->address, address) ){ 153 return (hci_connection_t *) it; 154 } 155 } 156 return NULL; 157 } 158 159 inline static void connectionSetAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 160 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags | flags); 161 } 162 163 inline static void connectionClearAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 164 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags & ~flags); 165 } 166 167 168 /** 169 * add authentication flags and reset timer 170 */ 171 static void hci_add_connection_flags_for_flipped_bd_addr(uint8_t *bd_addr, hci_authentication_flags_t flags){ 172 bd_addr_t addr; 173 bt_flip_addr(addr, *(bd_addr_t *) bd_addr); 174 hci_connection_t * conn = connection_for_address(addr); 175 if (conn) { 176 connectionSetAuthenticationFlags(conn, flags); 177 hci_connection_timestamp(conn); 178 } 179 } 180 181 int hci_authentication_active_for_handle(hci_con_handle_t handle){ 182 hci_connection_t * conn = hci_connection_for_handle(handle); 183 if (!conn) return 0; 184 if (!conn->authentication_flags) return 0; 185 if (conn->authentication_flags & SENT_LINK_KEY_REPLY) return 0; 186 if (conn->authentication_flags & RECV_LINK_KEY_NOTIFICATION) return 0; 187 return 1; 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], RECV_PIN_CODE_REQUEST); 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], HANDLE_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], RECV_USER_CONFIRM_REQUEST); 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], RECV_USER_PASSKEY_REQUEST); 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 break; 707 708 // case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT: 709 // handle = READ_BT_16(packet, 3); 710 // conn = hci_connection_for_handle(handle); 711 // if (!conn) break; 712 // if (conn->bonding_flags & BONDING_REQUESTED){ 713 // gap_security_level_t level = gap_security_level_for_connection(conn); 714 // hci_emit_security_level(handle, packet[2], level); 715 // } 716 // break; 717 718 #ifndef EMBEDDED 719 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 720 if (!hci_stack.remote_device_db) break; 721 if (packet[2]) break; // status not ok 722 bt_flip_addr(addr, &packet[3]); 723 // fix for invalid remote names - terminate on 0xff 724 for (i=0; i<248;i++){ 725 if (packet[9+i] == 0xff){ 726 packet[9+i] = 0; 727 break; 728 } 729 } 730 memset(&device_name, 0, sizeof(device_name_t)); 731 strncpy((char*) device_name, (char*) &packet[9], 248); 732 hci_stack.remote_device_db->put_name(&addr, &device_name); 733 break; 734 735 case HCI_EVENT_INQUIRY_RESULT: 736 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI: 737 if (!hci_stack.remote_device_db) break; 738 // first send inq result packet 739 hci_stack.packet_handler(HCI_EVENT_PACKET, packet, size); 740 // then send cached remote names 741 for (i=0; i<packet[2];i++){ 742 bt_flip_addr(addr, &packet[3+i*6]); 743 if (hci_stack.remote_device_db->get_name(&addr, &device_name)){ 744 hci_emit_remote_name_cached(&addr, &device_name); 745 } 746 } 747 return; 748 #endif 749 750 case HCI_EVENT_DISCONNECTION_COMPLETE: 751 if (!packet[2]){ 752 handle = READ_BT_16(packet, 3); 753 hci_connection_t * conn = hci_connection_for_handle(handle); 754 if (conn) { 755 hci_shutdown_connection(conn); 756 } 757 } 758 break; 759 760 case HCI_EVENT_HARDWARE_ERROR: 761 if(hci_stack.control && hci_stack.control->hw_error){ 762 (*hci_stack.control->hw_error)(); 763 } 764 break; 765 766 #ifdef HAVE_BLE 767 case HCI_EVENT_LE_META: 768 switch (packet[2]) { 769 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 770 // Connection management 771 bt_flip_addr(addr, &packet[8]); 772 log_info("LE Connection_complete (status=%u) %s\n", packet[3], bd_addr_to_str(addr)); 773 // LE connections are auto-accepted, so just create a connection if there isn't one already 774 conn = connection_for_address(addr); 775 if (packet[3]){ 776 if (conn){ 777 // outgoing connection failed, remove entry 778 linked_list_remove(&hci_stack.connections, (linked_item_t *) conn); 779 btstack_memory_hci_connection_free( conn ); 780 781 } 782 // if authentication error, also delete link key 783 if (packet[3] == 0x05) { 784 hci_drop_link_key_for_bd_addr(&addr); 785 } 786 break; 787 } 788 if (!conn){ 789 conn = create_connection_for_addr(addr); 790 } 791 if (!conn){ 792 // no memory 793 break; 794 } 795 796 conn->state = OPEN; 797 conn->con_handle = READ_BT_16(packet, 4); 798 799 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 800 801 // restart timer 802 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 803 // run_loop_add_timer(&conn->timeout); 804 805 log_info("New connection: handle %u, %s\n", conn->con_handle, bd_addr_to_str(conn->address)); 806 807 hci_emit_nr_connections_changed(); 808 break; 809 810 // printf("LE buffer size: %u, count %u\n", READ_BT_16(packet,6), packet[8]); 811 812 default: 813 break; 814 } 815 break; 816 #endif 817 818 default: 819 break; 820 } 821 822 // handle BT initialization 823 if (hci_stack.state == HCI_STATE_INITIALIZING){ 824 if (hci_stack.substate % 2){ 825 // odd: waiting for event 826 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE || packet[0] == HCI_EVENT_COMMAND_STATUS){ 827 // wait for explicit COMMAND COMPLETE on RESET 828 if (hci_stack.substate > 1 || COMMAND_COMPLETE_EVENT(packet, hci_reset)) { 829 hci_stack.substate++; 830 } 831 } 832 } 833 } 834 835 // help with BT sleep 836 if (hci_stack.state == HCI_STATE_FALLING_ASLEEP 837 && hci_stack.substate == 1 838 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 839 hci_stack.substate++; 840 } 841 842 hci_stack.packet_handler(HCI_EVENT_PACKET, packet, size); 843 844 // execute main loop 845 hci_run(); 846 } 847 848 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 849 switch (packet_type) { 850 case HCI_EVENT_PACKET: 851 event_handler(packet, size); 852 break; 853 case HCI_ACL_DATA_PACKET: 854 acl_handler(packet, size); 855 break; 856 default: 857 break; 858 } 859 } 860 861 /** Register HCI packet handlers */ 862 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 863 hci_stack.packet_handler = handler; 864 } 865 866 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 867 868 // reference to use transport layer implementation 869 hci_stack.hci_transport = transport; 870 871 // references to used control implementation 872 hci_stack.control = control; 873 874 // reference to used config 875 hci_stack.config = config; 876 877 // no connections yet 878 hci_stack.connections = NULL; 879 hci_stack.discoverable = 0; 880 hci_stack.connectable = 0; 881 hci_stack.bondable = 1; 882 883 // no pending cmds 884 hci_stack.decline_reason = 0; 885 hci_stack.new_scan_enable_value = 0xff; 886 887 // higher level handler 888 hci_stack.packet_handler = dummy_handler; 889 890 // store and open remote device db 891 hci_stack.remote_device_db = remote_device_db; 892 if (hci_stack.remote_device_db) { 893 hci_stack.remote_device_db->open(); 894 } 895 896 // max acl payload size defined in config.h 897 hci_stack.acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 898 899 // register packet handlers with transport 900 transport->register_packet_handler(&packet_handler); 901 902 hci_stack.state = HCI_STATE_OFF; 903 904 // class of device 905 hci_stack.class_of_device = 0x007a020c; // Smartphone 906 907 // Secure Simple Pairing default: enable, no I/O capabilities, auto accept 908 hci_stack.ssp_enable = 1; 909 hci_stack.ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 910 hci_stack.ssp_authentication_requirement = 0; 911 hci_stack.ssp_auto_accept = 1; 912 913 // LE 914 hci_stack.adv_addr_type = 0; 915 memset(hci_stack.adv_address, 0, 6); 916 } 917 918 void hci_close(){ 919 // close remote device db 920 if (hci_stack.remote_device_db) { 921 hci_stack.remote_device_db->close(); 922 } 923 while (hci_stack.connections) { 924 hci_shutdown_connection((hci_connection_t *) hci_stack.connections); 925 } 926 hci_power_control(HCI_POWER_OFF); 927 } 928 929 // State-Module-Driver overview 930 // state module low-level 931 // HCI_STATE_OFF off close 932 // HCI_STATE_INITIALIZING, on open 933 // HCI_STATE_WORKING, on open 934 // HCI_STATE_HALTING, on open 935 // HCI_STATE_SLEEPING, off/sleep close 936 // HCI_STATE_FALLING_ASLEEP on open 937 938 static int hci_power_control_on(void){ 939 940 // power on 941 int err = 0; 942 if (hci_stack.control && hci_stack.control->on){ 943 err = (*hci_stack.control->on)(hci_stack.config); 944 } 945 if (err){ 946 log_error( "POWER_ON failed\n"); 947 hci_emit_hci_open_failed(); 948 return err; 949 } 950 951 // open low-level device 952 err = hci_stack.hci_transport->open(hci_stack.config); 953 if (err){ 954 log_error( "HCI_INIT failed, turning Bluetooth off again\n"); 955 if (hci_stack.control && hci_stack.control->off){ 956 (*hci_stack.control->off)(hci_stack.config); 957 } 958 hci_emit_hci_open_failed(); 959 return err; 960 } 961 return 0; 962 } 963 964 static void hci_power_control_off(void){ 965 966 log_info("hci_power_control_off\n"); 967 968 // close low-level device 969 hci_stack.hci_transport->close(hci_stack.config); 970 971 log_info("hci_power_control_off - hci_transport closed\n"); 972 973 // power off 974 if (hci_stack.control && hci_stack.control->off){ 975 (*hci_stack.control->off)(hci_stack.config); 976 } 977 978 log_info("hci_power_control_off - control closed\n"); 979 980 hci_stack.state = HCI_STATE_OFF; 981 } 982 983 static void hci_power_control_sleep(void){ 984 985 log_info("hci_power_control_sleep\n"); 986 987 #if 0 988 // don't close serial port during sleep 989 990 // close low-level device 991 hci_stack.hci_transport->close(hci_stack.config); 992 #endif 993 994 // sleep mode 995 if (hci_stack.control && hci_stack.control->sleep){ 996 (*hci_stack.control->sleep)(hci_stack.config); 997 } 998 999 hci_stack.state = HCI_STATE_SLEEPING; 1000 } 1001 1002 static int hci_power_control_wake(void){ 1003 1004 log_info("hci_power_control_wake\n"); 1005 1006 // wake on 1007 if (hci_stack.control && hci_stack.control->wake){ 1008 (*hci_stack.control->wake)(hci_stack.config); 1009 } 1010 1011 #if 0 1012 // open low-level device 1013 int err = hci_stack.hci_transport->open(hci_stack.config); 1014 if (err){ 1015 log_error( "HCI_INIT failed, turning Bluetooth off again\n"); 1016 if (hci_stack.control && hci_stack.control->off){ 1017 (*hci_stack.control->off)(hci_stack.config); 1018 } 1019 hci_emit_hci_open_failed(); 1020 return err; 1021 } 1022 #endif 1023 1024 return 0; 1025 } 1026 1027 1028 int hci_power_control(HCI_POWER_MODE power_mode){ 1029 1030 log_info("hci_power_control: %u, current mode %u\n", power_mode, hci_stack.state); 1031 1032 int err = 0; 1033 switch (hci_stack.state){ 1034 1035 case HCI_STATE_OFF: 1036 switch (power_mode){ 1037 case HCI_POWER_ON: 1038 err = hci_power_control_on(); 1039 if (err) return err; 1040 // set up state machine 1041 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 1042 hci_stack.state = HCI_STATE_INITIALIZING; 1043 hci_stack.substate = 0; 1044 break; 1045 case HCI_POWER_OFF: 1046 // do nothing 1047 break; 1048 case HCI_POWER_SLEEP: 1049 // do nothing (with SLEEP == OFF) 1050 break; 1051 } 1052 break; 1053 1054 case HCI_STATE_INITIALIZING: 1055 switch (power_mode){ 1056 case HCI_POWER_ON: 1057 // do nothing 1058 break; 1059 case HCI_POWER_OFF: 1060 // no connections yet, just turn it off 1061 hci_power_control_off(); 1062 break; 1063 case HCI_POWER_SLEEP: 1064 // no connections yet, just turn it off 1065 hci_power_control_sleep(); 1066 break; 1067 } 1068 break; 1069 1070 case HCI_STATE_WORKING: 1071 switch (power_mode){ 1072 case HCI_POWER_ON: 1073 // do nothing 1074 break; 1075 case HCI_POWER_OFF: 1076 // see hci_run 1077 hci_stack.state = HCI_STATE_HALTING; 1078 break; 1079 case HCI_POWER_SLEEP: 1080 // see hci_run 1081 hci_stack.state = HCI_STATE_FALLING_ASLEEP; 1082 hci_stack.substate = 0; 1083 break; 1084 } 1085 break; 1086 1087 case HCI_STATE_HALTING: 1088 switch (power_mode){ 1089 case HCI_POWER_ON: 1090 // set up state machine 1091 hci_stack.state = HCI_STATE_INITIALIZING; 1092 hci_stack.substate = 0; 1093 break; 1094 case HCI_POWER_OFF: 1095 // do nothing 1096 break; 1097 case HCI_POWER_SLEEP: 1098 // see hci_run 1099 hci_stack.state = HCI_STATE_FALLING_ASLEEP; 1100 hci_stack.substate = 0; 1101 break; 1102 } 1103 break; 1104 1105 case HCI_STATE_FALLING_ASLEEP: 1106 switch (power_mode){ 1107 case HCI_POWER_ON: 1108 1109 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1110 // nothing to do, if H4 supports power management 1111 if (bt_control_iphone_power_management_enabled()){ 1112 hci_stack.state = HCI_STATE_INITIALIZING; 1113 hci_stack.substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1114 break; 1115 } 1116 #endif 1117 // set up state machine 1118 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 1119 hci_stack.state = HCI_STATE_INITIALIZING; 1120 hci_stack.substate = 0; 1121 break; 1122 case HCI_POWER_OFF: 1123 // see hci_run 1124 hci_stack.state = HCI_STATE_HALTING; 1125 break; 1126 case HCI_POWER_SLEEP: 1127 // do nothing 1128 break; 1129 } 1130 break; 1131 1132 case HCI_STATE_SLEEPING: 1133 switch (power_mode){ 1134 case HCI_POWER_ON: 1135 1136 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1137 // nothing to do, if H4 supports power management 1138 if (bt_control_iphone_power_management_enabled()){ 1139 hci_stack.state = HCI_STATE_INITIALIZING; 1140 hci_stack.substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1141 hci_update_scan_enable(); 1142 break; 1143 } 1144 #endif 1145 err = hci_power_control_wake(); 1146 if (err) return err; 1147 // set up state machine 1148 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 1149 hci_stack.state = HCI_STATE_INITIALIZING; 1150 hci_stack.substate = 0; 1151 break; 1152 case HCI_POWER_OFF: 1153 hci_stack.state = HCI_STATE_HALTING; 1154 break; 1155 case HCI_POWER_SLEEP: 1156 // do nothing 1157 break; 1158 } 1159 break; 1160 } 1161 1162 // create internal event 1163 hci_emit_state(); 1164 1165 // trigger next/first action 1166 hci_run(); 1167 1168 return 0; 1169 } 1170 1171 static void hci_update_scan_enable(void){ 1172 // 2 = page scan, 1 = inq scan 1173 hci_stack.new_scan_enable_value = hci_stack.connectable << 1 | hci_stack.discoverable; 1174 hci_run(); 1175 } 1176 1177 void hci_discoverable_control(uint8_t enable){ 1178 if (enable) enable = 1; // normalize argument 1179 1180 if (hci_stack.discoverable == enable){ 1181 hci_emit_discoverable_enabled(hci_stack.discoverable); 1182 return; 1183 } 1184 1185 hci_stack.discoverable = enable; 1186 hci_update_scan_enable(); 1187 } 1188 1189 void hci_connectable_control(uint8_t enable){ 1190 if (enable) enable = 1; // normalize argument 1191 1192 // don't emit event 1193 if (hci_stack.connectable == enable) return; 1194 1195 hci_stack.connectable = enable; 1196 hci_update_scan_enable(); 1197 } 1198 1199 bd_addr_t * hci_local_bd_addr(void){ 1200 return &hci_stack.local_bd_addr; 1201 } 1202 1203 void hci_run(){ 1204 1205 hci_connection_t * connection; 1206 linked_item_t * it; 1207 1208 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1209 1210 // global/non-connection oriented commands 1211 1212 // decline incoming connections 1213 if (hci_stack.decline_reason){ 1214 uint8_t reason = hci_stack.decline_reason; 1215 hci_stack.decline_reason = 0; 1216 hci_send_cmd(&hci_reject_connection_request, hci_stack.decline_addr, reason); 1217 return; 1218 } 1219 1220 // send scan enable 1221 if (hci_stack.state == HCI_STATE_WORKING && hci_stack.new_scan_enable_value != 0xff && hci_classic_supported()){ 1222 hci_send_cmd(&hci_write_scan_enable, hci_stack.new_scan_enable_value); 1223 hci_stack.new_scan_enable_value = 0xff; 1224 return; 1225 } 1226 1227 // send pending HCI commands 1228 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 1229 1230 connection = (hci_connection_t *) it; 1231 1232 if (connection->state == RECEIVED_CONNECTION_REQUEST){ 1233 log_info("sending hci_accept_connection_request\n"); 1234 connection->state = ACCEPTED_CONNECTION_REQUEST; 1235 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 1236 return; 1237 } 1238 1239 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 1240 log_info("responding to link key request\n"); 1241 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 1242 link_key_t link_key; 1243 link_key_type_t link_key_type; 1244 if ( hci_stack.remote_device_db 1245 && hci_stack.remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type) 1246 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 1247 connection->link_key_type = link_key_type; 1248 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 1249 } else { 1250 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 1251 } 1252 return; 1253 } 1254 1255 if (connection->authentication_flags & HANDLE_PIN_CODE_REQUEST){ 1256 log_info("denying to pin request\n"); 1257 connectionClearAuthenticationFlags(connection, HANDLE_PIN_CODE_REQUEST); 1258 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 1259 return; 1260 } 1261 1262 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 1263 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 1264 if (hci_stack.bondable && hci_stack.ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN){ 1265 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack.ssp_io_capability, NULL, hci_stack.ssp_authentication_requirement); 1266 } else { 1267 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 1268 } 1269 return; 1270 } 1271 1272 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 1273 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 1274 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 1275 return; 1276 } 1277 1278 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 1279 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 1280 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 1281 return; 1282 } 1283 1284 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 1285 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 1286 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 1287 return; 1288 } 1289 1290 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 1291 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 1292 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 1293 return; 1294 } 1295 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 1296 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 1297 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 1298 return; 1299 } 1300 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 1301 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 1302 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 1303 return; 1304 } 1305 } 1306 1307 switch (hci_stack.state){ 1308 case HCI_STATE_INITIALIZING: 1309 // log_info("hci_init: substate %u\n", hci_stack.substate); 1310 if (hci_stack.substate % 2) { 1311 // odd: waiting for command completion 1312 return; 1313 } 1314 switch (hci_stack.substate >> 1){ 1315 case 0: // RESET 1316 hci_send_cmd(&hci_reset); 1317 1318 if (hci_stack.config == 0 || ((hci_uart_config_t *)hci_stack.config)->baudrate_main == 0){ 1319 // skip baud change 1320 hci_stack.substate = 4; // >> 1 = 2 1321 } 1322 break; 1323 case 1: // SEND BAUD CHANGE 1324 hci_stack.control->baudrate_cmd(hci_stack.config, ((hci_uart_config_t *)hci_stack.config)->baudrate_main, hci_stack.hci_packet_buffer); 1325 hci_send_cmd_packet(hci_stack.hci_packet_buffer, 3 + hci_stack.hci_packet_buffer[2]); 1326 break; 1327 case 2: // LOCAL BAUD CHANGE 1328 hci_stack.hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack.config)->baudrate_main); 1329 hci_stack.substate += 2; 1330 // break missing here for fall through 1331 1332 case 3: 1333 // Custom initialization 1334 if (hci_stack.control && hci_stack.control->next_cmd){ 1335 int valid_cmd = (*hci_stack.control->next_cmd)(hci_stack.config, hci_stack.hci_packet_buffer); 1336 if (valid_cmd){ 1337 int size = 3 + hci_stack.hci_packet_buffer[2]; 1338 hci_stack.hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack.hci_packet_buffer, size); 1339 hci_stack.substate = 4; // more init commands 1340 break; 1341 } 1342 log_info("hci_run: init script done\n\r"); 1343 } 1344 // otherwise continue 1345 hci_send_cmd(&hci_read_bd_addr); 1346 break; 1347 case 4: 1348 hci_send_cmd(&hci_read_buffer_size); 1349 break; 1350 case 5: 1351 hci_send_cmd(&hci_read_local_supported_features); 1352 break; 1353 case 6: 1354 if (hci_le_supported()){ 1355 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 1356 } else { 1357 // Kensington Bluetoot 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 1358 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 1359 } 1360 1361 // skip Classic init commands for LE only chipsets 1362 if (!hci_classic_supported()){ 1363 if (hci_le_supported()){ 1364 hci_stack.substate = 11 << 1; // skip all classic command 1365 } else { 1366 log_error("Neither BR/EDR nor LE supported"); 1367 hci_stack.substate = 13 << 1; // skip all 1368 } 1369 } 1370 break; 1371 case 7: 1372 if (hci_ssp_supported()){ 1373 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack.ssp_enable); 1374 break; 1375 } 1376 hci_stack.substate += 2; 1377 // break missing here for fall through 1378 1379 case 8: 1380 // ca. 15 sec 1381 hci_send_cmd(&hci_write_page_timeout, 0x6000); 1382 break; 1383 case 9: 1384 hci_send_cmd(&hci_write_class_of_device, hci_stack.class_of_device); 1385 break; 1386 case 10: 1387 if (hci_stack.local_name){ 1388 hci_send_cmd(&hci_write_local_name, hci_stack.local_name); 1389 } else { 1390 char hostname[30]; 1391 #ifdef EMBEDDED 1392 // BTstack-11:22:33:44:55:66 1393 strcpy(hostname, "BTstack "); 1394 strcat(hostname, bd_addr_to_str(hci_stack.local_bd_addr)); 1395 printf("---> Name %s\n", hostname); 1396 #else 1397 // hostname for POSIX systems 1398 gethostname(hostname, 30); 1399 hostname[29] = '\0'; 1400 #endif 1401 hci_send_cmd(&hci_write_local_name, hostname); 1402 } 1403 break; 1404 case 11: 1405 hci_send_cmd(&hci_write_scan_enable, (hci_stack.connectable << 1) | hci_stack.discoverable); // page scan 1406 if (!hci_le_supported()){ 1407 // SKIP LE init for Classic only configuration 1408 hci_stack.substate = 13 << 1; 1409 } 1410 break; 1411 1412 #ifdef HAVE_BLE 1413 // LE INIT 1414 case 12: 1415 hci_send_cmd(&hci_le_read_buffer_size); 1416 break; 1417 case 13: 1418 // LE Supported Host = 1, Simultaneous Host = 0 1419 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 1420 break; 1421 #endif 1422 1423 // DONE 1424 case 14: 1425 // done. 1426 hci_stack.state = HCI_STATE_WORKING; 1427 hci_emit_state(); 1428 break; 1429 default: 1430 break; 1431 } 1432 hci_stack.substate++; 1433 break; 1434 1435 case HCI_STATE_HALTING: 1436 1437 log_info("HCI_STATE_HALTING\n"); 1438 // close all open connections 1439 connection = (hci_connection_t *) hci_stack.connections; 1440 if (connection){ 1441 1442 // send disconnect 1443 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1444 1445 log_info("HCI_STATE_HALTING, connection %p, handle %u\n", connection, (uint16_t)connection->con_handle); 1446 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1447 1448 // send disconnected event right away - causes higher layer connections to get closed, too. 1449 hci_shutdown_connection(connection); 1450 return; 1451 } 1452 log_info("HCI_STATE_HALTING, calling off\n"); 1453 1454 // switch mode 1455 hci_power_control_off(); 1456 1457 log_info("HCI_STATE_HALTING, emitting state\n"); 1458 hci_emit_state(); 1459 log_info("HCI_STATE_HALTING, done\n"); 1460 break; 1461 1462 case HCI_STATE_FALLING_ASLEEP: 1463 switch(hci_stack.substate) { 1464 case 0: 1465 log_info("HCI_STATE_FALLING_ASLEEP\n"); 1466 // close all open connections 1467 connection = (hci_connection_t *) hci_stack.connections; 1468 1469 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1470 // don't close connections, if H4 supports power management 1471 if (bt_control_iphone_power_management_enabled()){ 1472 connection = NULL; 1473 } 1474 #endif 1475 if (connection){ 1476 1477 // send disconnect 1478 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1479 1480 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u\n", connection, (uint16_t)connection->con_handle); 1481 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1482 1483 // send disconnected event right away - causes higher layer connections to get closed, too. 1484 hci_shutdown_connection(connection); 1485 return; 1486 } 1487 1488 if (hci_classic_supported()){ 1489 // disable page and inquiry scan 1490 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1491 1492 log_info("HCI_STATE_HALTING, disabling inq scans\n"); 1493 hci_send_cmd(&hci_write_scan_enable, hci_stack.connectable << 1); // drop inquiry scan but keep page scan 1494 1495 // continue in next sub state 1496 hci_stack.substate++; 1497 break; 1498 } 1499 // fall through for ble-only chips 1500 1501 case 2: 1502 log_info("HCI_STATE_HALTING, calling sleep\n"); 1503 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1504 // don't actually go to sleep, if H4 supports power management 1505 if (bt_control_iphone_power_management_enabled()){ 1506 // SLEEP MODE reached 1507 hci_stack.state = HCI_STATE_SLEEPING; 1508 hci_emit_state(); 1509 break; 1510 } 1511 #endif 1512 // switch mode 1513 hci_power_control_sleep(); // changes hci_stack.state to SLEEP 1514 hci_emit_state(); 1515 break; 1516 1517 default: 1518 break; 1519 } 1520 break; 1521 1522 default: 1523 break; 1524 } 1525 } 1526 1527 int hci_send_cmd_packet(uint8_t *packet, int size){ 1528 bd_addr_t addr; 1529 hci_connection_t * conn; 1530 // house-keeping 1531 1532 // create_connection? 1533 if (IS_COMMAND(packet, hci_create_connection)){ 1534 bt_flip_addr(addr, &packet[3]); 1535 log_info("Create_connection to %s\n", bd_addr_to_str(addr)); 1536 conn = connection_for_address(addr); 1537 if (conn) { 1538 // if connection exists 1539 if (conn->state == OPEN) { 1540 // and OPEN, emit connection complete command 1541 hci_emit_connection_complete(conn, 0); 1542 } 1543 // otherwise, just ignore as it is already in the open process 1544 return 0; // don't sent packet to controller 1545 1546 } 1547 // create connection struct and register, state = SENT_CREATE_CONNECTION 1548 conn = create_connection_for_addr(addr); 1549 if (!conn){ 1550 // notify client that alloc failed 1551 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 1552 return 0; // don't sent packet to controller 1553 } 1554 conn->state = SENT_CREATE_CONNECTION; 1555 } 1556 1557 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 1558 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 1559 } 1560 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 1561 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 1562 } 1563 1564 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 1565 if (hci_stack.remote_device_db){ 1566 bt_flip_addr(addr, &packet[3]); 1567 hci_stack.remote_device_db->delete_link_key(&addr); 1568 } 1569 } 1570 1571 #ifdef HAVE_BLE 1572 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 1573 hci_stack.adv_addr_type = packet[8]; 1574 } 1575 if (IS_COMMAND(packet, hci_le_set_random_address)){ 1576 bt_flip_addr(hci_stack.adv_address, &packet[3]); 1577 } 1578 #endif 1579 1580 1581 hci_stack.num_cmd_packets--; 1582 return hci_stack.hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 1583 } 1584 1585 // disconnect because of security block 1586 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 1587 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1588 if (!connection) return; 1589 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 1590 } 1591 1592 1593 // Configure Secure Simple Pairing 1594 1595 // enable will enable SSP during init 1596 void hci_ssp_set_enable(int enable){ 1597 hci_stack.ssp_enable = enable; 1598 } 1599 1600 int hci_local_ssp_activated(){ 1601 return hci_ssp_supported() && hci_stack.ssp_enable; 1602 } 1603 1604 // if set, BTstack will respond to io capability request using authentication requirement 1605 void hci_ssp_set_io_capability(int io_capability){ 1606 hci_stack.ssp_io_capability = io_capability; 1607 } 1608 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 1609 hci_stack.ssp_authentication_requirement = authentication_requirement; 1610 } 1611 1612 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 1613 void hci_ssp_set_auto_accept(int auto_accept){ 1614 hci_stack.ssp_auto_accept = auto_accept; 1615 } 1616 1617 /** 1618 * pre: numcmds >= 0 - it's allowed to send a command to the controller 1619 */ 1620 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 1621 va_list argptr; 1622 va_start(argptr, cmd); 1623 uint16_t size = hci_create_cmd_internal(hci_stack.hci_packet_buffer, cmd, argptr); 1624 va_end(argptr); 1625 return hci_send_cmd_packet(hci_stack.hci_packet_buffer, size); 1626 } 1627 1628 // Create various non-HCI events. 1629 // TODO: generalize, use table similar to hci_create_command 1630 1631 void hci_emit_state(){ 1632 log_info("BTSTACK_EVENT_STATE %u", hci_stack.state); 1633 uint8_t event[3]; 1634 event[0] = BTSTACK_EVENT_STATE; 1635 event[1] = sizeof(event) - 2; 1636 event[2] = hci_stack.state; 1637 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1638 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1639 } 1640 1641 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 1642 uint8_t event[13]; 1643 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 1644 event[1] = sizeof(event) - 2; 1645 event[2] = status; 1646 bt_store_16(event, 3, conn->con_handle); 1647 bt_flip_addr(&event[5], conn->address); 1648 event[11] = 1; // ACL connection 1649 event[12] = 0; // encryption disabled 1650 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1651 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1652 } 1653 1654 void hci_emit_disconnection_complete(uint16_t handle, uint8_t reason){ 1655 uint8_t event[6]; 1656 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 1657 event[1] = sizeof(event) - 2; 1658 event[2] = 0; // status = OK 1659 bt_store_16(event, 3, handle); 1660 event[5] = reason; 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_l2cap_check_timeout(hci_connection_t *conn){ 1666 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 1667 uint8_t event[4]; 1668 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 1669 event[1] = sizeof(event) - 2; 1670 bt_store_16(event, 2, conn->con_handle); 1671 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1672 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1673 } 1674 1675 void hci_emit_nr_connections_changed(){ 1676 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 1677 uint8_t event[3]; 1678 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 1679 event[1] = sizeof(event) - 2; 1680 event[2] = nr_hci_connections(); 1681 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1682 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1683 } 1684 1685 void hci_emit_hci_open_failed(){ 1686 log_info("BTSTACK_EVENT_POWERON_FAILED"); 1687 uint8_t event[2]; 1688 event[0] = BTSTACK_EVENT_POWERON_FAILED; 1689 event[1] = sizeof(event) - 2; 1690 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1691 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1692 } 1693 1694 #ifndef EMBEDDED 1695 void hci_emit_btstack_version() { 1696 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 1697 uint8_t event[6]; 1698 event[0] = BTSTACK_EVENT_VERSION; 1699 event[1] = sizeof(event) - 2; 1700 event[2] = BTSTACK_MAJOR; 1701 event[3] = BTSTACK_MINOR; 1702 bt_store_16(event, 4, BTSTACK_REVISION); 1703 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1704 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1705 } 1706 #endif 1707 1708 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 1709 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 1710 uint8_t event[3]; 1711 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 1712 event[1] = sizeof(event) - 2; 1713 event[2] = enabled; 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 void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){ 1719 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 1720 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 1721 event[1] = sizeof(event) - 2 - 1; 1722 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 1723 bt_flip_addr(&event[3], *addr); 1724 memcpy(&event[9], name, 248); 1725 1726 event[9+248] = 0; // assert \0 for log_info 1727 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(*addr), &event[9]); 1728 1729 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 1730 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 1731 } 1732 1733 void hci_emit_discoverable_enabled(uint8_t enabled){ 1734 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 1735 uint8_t event[3]; 1736 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 1737 event[1] = sizeof(event) - 2; 1738 event[2] = enabled; 1739 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1740 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1741 } 1742 1743 void hci_emit_security_level(hci_con_handle_t con_handle, uint8_t status, gap_security_level_t level){ 1744 uint8_t event[6]; 1745 int pos = 0; 1746 event[pos++] = GAP_AUTHENTICATION_RESULT; 1747 event[pos++] = sizeof(event) - 2; 1748 event[pos++] = status; 1749 bt_store_16(event, 3, con_handle); 1750 pos += 2; 1751 event[pos++] = level; 1752 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1753 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1754 } 1755 1756 // query if remote side supports SSP 1757 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 1758 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1759 if (!connection) return 0; 1760 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 1761 } 1762 1763 // GAP API 1764 /** 1765 * @bbrief enable/disable bonding. default is enabled 1766 * @praram enabled 1767 */ 1768 void gap_set_bondable_mode(int enable){ 1769 hci_stack.bondable = enable ? 1 : 0; 1770 } 1771 1772 /** 1773 * @brief map link keys to security levels 1774 */ 1775 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 1776 switch (link_key_type){ 1777 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 1778 return LEVEL_4; 1779 case COMBINATION_KEY: 1780 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 1781 return LEVEL_3; 1782 default: 1783 return LEVEL_2; 1784 } 1785 } 1786 1787 gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 1788 if (!connection) return LEVEL_0; 1789 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 1790 return gap_security_level_for_link_key_type(connection->link_key_type); 1791 } 1792 1793 1794 /** 1795 * @brief get current security level 1796 */ 1797 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 1798 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1799 if (!connection) return LEVEL_0; 1800 return gap_security_level_for_connection(connection); 1801 } 1802 1803 /** 1804 * @brief request connection to device to 1805 * @result GAP_AUTHENTICATION_RESULT 1806 */ 1807 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 1808 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1809 if (!connection){ 1810 hci_emit_security_level(con_handle, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER, LEVEL_0); 1811 return; 1812 } 1813 gap_security_level_t current_level = gap_security_level(con_handle); 1814 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 1815 if (current_level >= requested_level){ 1816 hci_emit_security_level(con_handle, 0, current_level); 1817 return; 1818 } 1819 connection->requested_security_level = requested_level; 1820 connection->bonding_flags |= BONDING_REQUESTED; 1821 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 1822 } 1823