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