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 if (gap_security_level_for_link_key_type(conn->link_key_type) >= conn->requested_security_level){ 715 // link key sufficient for requested security 716 conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 717 } else { 718 // not enough 719 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 720 } 721 break; 722 723 #ifndef EMBEDDED 724 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 725 if (!hci_stack.remote_device_db) break; 726 if (packet[2]) break; // status not ok 727 bt_flip_addr(addr, &packet[3]); 728 // fix for invalid remote names - terminate on 0xff 729 for (i=0; i<248;i++){ 730 if (packet[9+i] == 0xff){ 731 packet[9+i] = 0; 732 break; 733 } 734 } 735 memset(&device_name, 0, sizeof(device_name_t)); 736 strncpy((char*) device_name, (char*) &packet[9], 248); 737 hci_stack.remote_device_db->put_name(&addr, &device_name); 738 break; 739 740 case HCI_EVENT_INQUIRY_RESULT: 741 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI: 742 if (!hci_stack.remote_device_db) break; 743 // first send inq result packet 744 hci_stack.packet_handler(HCI_EVENT_PACKET, packet, size); 745 // then send cached remote names 746 for (i=0; i<packet[2];i++){ 747 bt_flip_addr(addr, &packet[3+i*6]); 748 if (hci_stack.remote_device_db->get_name(&addr, &device_name)){ 749 hci_emit_remote_name_cached(&addr, &device_name); 750 } 751 } 752 return; 753 #endif 754 755 case HCI_EVENT_DISCONNECTION_COMPLETE: 756 if (!packet[2]){ 757 handle = READ_BT_16(packet, 3); 758 hci_connection_t * conn = hci_connection_for_handle(handle); 759 if (conn) { 760 hci_shutdown_connection(conn); 761 } 762 } 763 break; 764 765 case HCI_EVENT_HARDWARE_ERROR: 766 if(hci_stack.control && hci_stack.control->hw_error){ 767 (*hci_stack.control->hw_error)(); 768 } 769 break; 770 771 #ifdef HAVE_BLE 772 case HCI_EVENT_LE_META: 773 switch (packet[2]) { 774 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 775 // Connection management 776 bt_flip_addr(addr, &packet[8]); 777 log_info("LE Connection_complete (status=%u) %s\n", packet[3], bd_addr_to_str(addr)); 778 // LE connections are auto-accepted, so just create a connection if there isn't one already 779 conn = connection_for_address(addr); 780 if (packet[3]){ 781 if (conn){ 782 // outgoing connection failed, remove entry 783 linked_list_remove(&hci_stack.connections, (linked_item_t *) conn); 784 btstack_memory_hci_connection_free( conn ); 785 786 } 787 // if authentication error, also delete link key 788 if (packet[3] == 0x05) { 789 hci_drop_link_key_for_bd_addr(&addr); 790 } 791 break; 792 } 793 if (!conn){ 794 conn = create_connection_for_addr(addr); 795 } 796 if (!conn){ 797 // no memory 798 break; 799 } 800 801 conn->state = OPEN; 802 conn->con_handle = READ_BT_16(packet, 4); 803 804 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 805 806 // restart timer 807 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 808 // run_loop_add_timer(&conn->timeout); 809 810 log_info("New connection: handle %u, %s\n", conn->con_handle, bd_addr_to_str(conn->address)); 811 812 hci_emit_nr_connections_changed(); 813 break; 814 815 // printf("LE buffer size: %u, count %u\n", READ_BT_16(packet,6), packet[8]); 816 817 default: 818 break; 819 } 820 break; 821 #endif 822 823 default: 824 break; 825 } 826 827 // handle BT initialization 828 if (hci_stack.state == HCI_STATE_INITIALIZING){ 829 if (hci_stack.substate % 2){ 830 // odd: waiting for event 831 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE || packet[0] == HCI_EVENT_COMMAND_STATUS){ 832 // wait for explicit COMMAND COMPLETE on RESET 833 if (hci_stack.substate > 1 || COMMAND_COMPLETE_EVENT(packet, hci_reset)) { 834 hci_stack.substate++; 835 } 836 } 837 } 838 } 839 840 // help with BT sleep 841 if (hci_stack.state == HCI_STATE_FALLING_ASLEEP 842 && hci_stack.substate == 1 843 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 844 hci_stack.substate++; 845 } 846 847 hci_stack.packet_handler(HCI_EVENT_PACKET, packet, size); 848 849 // execute main loop 850 hci_run(); 851 } 852 853 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 854 switch (packet_type) { 855 case HCI_EVENT_PACKET: 856 event_handler(packet, size); 857 break; 858 case HCI_ACL_DATA_PACKET: 859 acl_handler(packet, size); 860 break; 861 default: 862 break; 863 } 864 } 865 866 /** Register HCI packet handlers */ 867 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 868 hci_stack.packet_handler = handler; 869 } 870 871 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 872 873 // reference to use transport layer implementation 874 hci_stack.hci_transport = transport; 875 876 // references to used control implementation 877 hci_stack.control = control; 878 879 // reference to used config 880 hci_stack.config = config; 881 882 // no connections yet 883 hci_stack.connections = NULL; 884 hci_stack.discoverable = 0; 885 hci_stack.connectable = 0; 886 hci_stack.bondable = 1; 887 888 // no pending cmds 889 hci_stack.decline_reason = 0; 890 hci_stack.new_scan_enable_value = 0xff; 891 892 // higher level handler 893 hci_stack.packet_handler = dummy_handler; 894 895 // store and open remote device db 896 hci_stack.remote_device_db = remote_device_db; 897 if (hci_stack.remote_device_db) { 898 hci_stack.remote_device_db->open(); 899 } 900 901 // max acl payload size defined in config.h 902 hci_stack.acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 903 904 // register packet handlers with transport 905 transport->register_packet_handler(&packet_handler); 906 907 hci_stack.state = HCI_STATE_OFF; 908 909 // class of device 910 hci_stack.class_of_device = 0x007a020c; // Smartphone 911 912 // Secure Simple Pairing default: enable, no I/O capabilities, auto accept 913 hci_stack.ssp_enable = 1; 914 hci_stack.ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 915 hci_stack.ssp_authentication_requirement = 0; 916 hci_stack.ssp_auto_accept = 1; 917 918 // LE 919 hci_stack.adv_addr_type = 0; 920 memset(hci_stack.adv_address, 0, 6); 921 } 922 923 void hci_close(){ 924 // close remote device db 925 if (hci_stack.remote_device_db) { 926 hci_stack.remote_device_db->close(); 927 } 928 while (hci_stack.connections) { 929 hci_shutdown_connection((hci_connection_t *) hci_stack.connections); 930 } 931 hci_power_control(HCI_POWER_OFF); 932 } 933 934 // State-Module-Driver overview 935 // state module low-level 936 // HCI_STATE_OFF off close 937 // HCI_STATE_INITIALIZING, on open 938 // HCI_STATE_WORKING, on open 939 // HCI_STATE_HALTING, on open 940 // HCI_STATE_SLEEPING, off/sleep close 941 // HCI_STATE_FALLING_ASLEEP on open 942 943 static int hci_power_control_on(void){ 944 945 // power on 946 int err = 0; 947 if (hci_stack.control && hci_stack.control->on){ 948 err = (*hci_stack.control->on)(hci_stack.config); 949 } 950 if (err){ 951 log_error( "POWER_ON failed\n"); 952 hci_emit_hci_open_failed(); 953 return err; 954 } 955 956 // open low-level device 957 err = hci_stack.hci_transport->open(hci_stack.config); 958 if (err){ 959 log_error( "HCI_INIT failed, turning Bluetooth off again\n"); 960 if (hci_stack.control && hci_stack.control->off){ 961 (*hci_stack.control->off)(hci_stack.config); 962 } 963 hci_emit_hci_open_failed(); 964 return err; 965 } 966 return 0; 967 } 968 969 static void hci_power_control_off(void){ 970 971 log_info("hci_power_control_off\n"); 972 973 // close low-level device 974 hci_stack.hci_transport->close(hci_stack.config); 975 976 log_info("hci_power_control_off - hci_transport closed\n"); 977 978 // power off 979 if (hci_stack.control && hci_stack.control->off){ 980 (*hci_stack.control->off)(hci_stack.config); 981 } 982 983 log_info("hci_power_control_off - control closed\n"); 984 985 hci_stack.state = HCI_STATE_OFF; 986 } 987 988 static void hci_power_control_sleep(void){ 989 990 log_info("hci_power_control_sleep\n"); 991 992 #if 0 993 // don't close serial port during sleep 994 995 // close low-level device 996 hci_stack.hci_transport->close(hci_stack.config); 997 #endif 998 999 // sleep mode 1000 if (hci_stack.control && hci_stack.control->sleep){ 1001 (*hci_stack.control->sleep)(hci_stack.config); 1002 } 1003 1004 hci_stack.state = HCI_STATE_SLEEPING; 1005 } 1006 1007 static int hci_power_control_wake(void){ 1008 1009 log_info("hci_power_control_wake\n"); 1010 1011 // wake on 1012 if (hci_stack.control && hci_stack.control->wake){ 1013 (*hci_stack.control->wake)(hci_stack.config); 1014 } 1015 1016 #if 0 1017 // open low-level device 1018 int err = hci_stack.hci_transport->open(hci_stack.config); 1019 if (err){ 1020 log_error( "HCI_INIT failed, turning Bluetooth off again\n"); 1021 if (hci_stack.control && hci_stack.control->off){ 1022 (*hci_stack.control->off)(hci_stack.config); 1023 } 1024 hci_emit_hci_open_failed(); 1025 return err; 1026 } 1027 #endif 1028 1029 return 0; 1030 } 1031 1032 1033 int hci_power_control(HCI_POWER_MODE power_mode){ 1034 1035 log_info("hci_power_control: %u, current mode %u\n", power_mode, hci_stack.state); 1036 1037 int err = 0; 1038 switch (hci_stack.state){ 1039 1040 case HCI_STATE_OFF: 1041 switch (power_mode){ 1042 case HCI_POWER_ON: 1043 err = hci_power_control_on(); 1044 if (err) return err; 1045 // set up state machine 1046 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 1047 hci_stack.state = HCI_STATE_INITIALIZING; 1048 hci_stack.substate = 0; 1049 break; 1050 case HCI_POWER_OFF: 1051 // do nothing 1052 break; 1053 case HCI_POWER_SLEEP: 1054 // do nothing (with SLEEP == OFF) 1055 break; 1056 } 1057 break; 1058 1059 case HCI_STATE_INITIALIZING: 1060 switch (power_mode){ 1061 case HCI_POWER_ON: 1062 // do nothing 1063 break; 1064 case HCI_POWER_OFF: 1065 // no connections yet, just turn it off 1066 hci_power_control_off(); 1067 break; 1068 case HCI_POWER_SLEEP: 1069 // no connections yet, just turn it off 1070 hci_power_control_sleep(); 1071 break; 1072 } 1073 break; 1074 1075 case HCI_STATE_WORKING: 1076 switch (power_mode){ 1077 case HCI_POWER_ON: 1078 // do nothing 1079 break; 1080 case HCI_POWER_OFF: 1081 // see hci_run 1082 hci_stack.state = HCI_STATE_HALTING; 1083 break; 1084 case HCI_POWER_SLEEP: 1085 // see hci_run 1086 hci_stack.state = HCI_STATE_FALLING_ASLEEP; 1087 hci_stack.substate = 0; 1088 break; 1089 } 1090 break; 1091 1092 case HCI_STATE_HALTING: 1093 switch (power_mode){ 1094 case HCI_POWER_ON: 1095 // set up state machine 1096 hci_stack.state = HCI_STATE_INITIALIZING; 1097 hci_stack.substate = 0; 1098 break; 1099 case HCI_POWER_OFF: 1100 // do nothing 1101 break; 1102 case HCI_POWER_SLEEP: 1103 // see hci_run 1104 hci_stack.state = HCI_STATE_FALLING_ASLEEP; 1105 hci_stack.substate = 0; 1106 break; 1107 } 1108 break; 1109 1110 case HCI_STATE_FALLING_ASLEEP: 1111 switch (power_mode){ 1112 case HCI_POWER_ON: 1113 1114 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1115 // nothing to do, if H4 supports power management 1116 if (bt_control_iphone_power_management_enabled()){ 1117 hci_stack.state = HCI_STATE_INITIALIZING; 1118 hci_stack.substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1119 break; 1120 } 1121 #endif 1122 // set up state machine 1123 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 1124 hci_stack.state = HCI_STATE_INITIALIZING; 1125 hci_stack.substate = 0; 1126 break; 1127 case HCI_POWER_OFF: 1128 // see hci_run 1129 hci_stack.state = HCI_STATE_HALTING; 1130 break; 1131 case HCI_POWER_SLEEP: 1132 // do nothing 1133 break; 1134 } 1135 break; 1136 1137 case HCI_STATE_SLEEPING: 1138 switch (power_mode){ 1139 case HCI_POWER_ON: 1140 1141 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1142 // nothing to do, if H4 supports power management 1143 if (bt_control_iphone_power_management_enabled()){ 1144 hci_stack.state = HCI_STATE_INITIALIZING; 1145 hci_stack.substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1146 hci_update_scan_enable(); 1147 break; 1148 } 1149 #endif 1150 err = hci_power_control_wake(); 1151 if (err) return err; 1152 // set up state machine 1153 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 1154 hci_stack.state = HCI_STATE_INITIALIZING; 1155 hci_stack.substate = 0; 1156 break; 1157 case HCI_POWER_OFF: 1158 hci_stack.state = HCI_STATE_HALTING; 1159 break; 1160 case HCI_POWER_SLEEP: 1161 // do nothing 1162 break; 1163 } 1164 break; 1165 } 1166 1167 // create internal event 1168 hci_emit_state(); 1169 1170 // trigger next/first action 1171 hci_run(); 1172 1173 return 0; 1174 } 1175 1176 static void hci_update_scan_enable(void){ 1177 // 2 = page scan, 1 = inq scan 1178 hci_stack.new_scan_enable_value = hci_stack.connectable << 1 | hci_stack.discoverable; 1179 hci_run(); 1180 } 1181 1182 void hci_discoverable_control(uint8_t enable){ 1183 if (enable) enable = 1; // normalize argument 1184 1185 if (hci_stack.discoverable == enable){ 1186 hci_emit_discoverable_enabled(hci_stack.discoverable); 1187 return; 1188 } 1189 1190 hci_stack.discoverable = enable; 1191 hci_update_scan_enable(); 1192 } 1193 1194 void hci_connectable_control(uint8_t enable){ 1195 if (enable) enable = 1; // normalize argument 1196 1197 // don't emit event 1198 if (hci_stack.connectable == enable) return; 1199 1200 hci_stack.connectable = enable; 1201 hci_update_scan_enable(); 1202 } 1203 1204 bd_addr_t * hci_local_bd_addr(void){ 1205 return &hci_stack.local_bd_addr; 1206 } 1207 1208 void hci_run(){ 1209 1210 hci_connection_t * connection; 1211 linked_item_t * it; 1212 1213 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1214 1215 // global/non-connection oriented commands 1216 1217 // decline incoming connections 1218 if (hci_stack.decline_reason){ 1219 uint8_t reason = hci_stack.decline_reason; 1220 hci_stack.decline_reason = 0; 1221 hci_send_cmd(&hci_reject_connection_request, hci_stack.decline_addr, reason); 1222 return; 1223 } 1224 1225 // send scan enable 1226 if (hci_stack.state == HCI_STATE_WORKING && hci_stack.new_scan_enable_value != 0xff && hci_classic_supported()){ 1227 hci_send_cmd(&hci_write_scan_enable, hci_stack.new_scan_enable_value); 1228 hci_stack.new_scan_enable_value = 0xff; 1229 return; 1230 } 1231 1232 // send pending HCI commands 1233 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 1234 1235 connection = (hci_connection_t *) it; 1236 1237 if (connection->state == RECEIVED_CONNECTION_REQUEST){ 1238 log_info("sending hci_accept_connection_request\n"); 1239 connection->state = ACCEPTED_CONNECTION_REQUEST; 1240 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 1241 return; 1242 } 1243 1244 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 1245 log_info("responding to link key request\n"); 1246 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 1247 link_key_t link_key; 1248 link_key_type_t link_key_type; 1249 if ( hci_stack.remote_device_db 1250 && hci_stack.remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type) 1251 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 1252 connection->link_key_type = link_key_type; 1253 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 1254 } else { 1255 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 1256 } 1257 return; 1258 } 1259 1260 if (connection->authentication_flags & HANDLE_PIN_CODE_REQUEST){ 1261 log_info("denying to pin request\n"); 1262 connectionClearAuthenticationFlags(connection, HANDLE_PIN_CODE_REQUEST); 1263 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 1264 return; 1265 } 1266 1267 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 1268 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 1269 if (hci_stack.bondable && hci_stack.ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN){ 1270 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack.ssp_io_capability, NULL, hci_stack.ssp_authentication_requirement); 1271 } else { 1272 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 1273 } 1274 return; 1275 } 1276 1277 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 1278 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 1279 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 1280 return; 1281 } 1282 1283 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 1284 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 1285 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 1286 return; 1287 } 1288 1289 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 1290 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 1291 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 1292 return; 1293 } 1294 1295 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 1296 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 1297 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 1298 return; 1299 } 1300 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 1301 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 1302 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 1303 return; 1304 } 1305 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 1306 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 1307 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 1308 return; 1309 } 1310 } 1311 1312 switch (hci_stack.state){ 1313 case HCI_STATE_INITIALIZING: 1314 // log_info("hci_init: substate %u\n", hci_stack.substate); 1315 if (hci_stack.substate % 2) { 1316 // odd: waiting for command completion 1317 return; 1318 } 1319 switch (hci_stack.substate >> 1){ 1320 case 0: // RESET 1321 hci_send_cmd(&hci_reset); 1322 1323 if (hci_stack.config == 0 || ((hci_uart_config_t *)hci_stack.config)->baudrate_main == 0){ 1324 // skip baud change 1325 hci_stack.substate = 4; // >> 1 = 2 1326 } 1327 break; 1328 case 1: // SEND BAUD CHANGE 1329 hci_stack.control->baudrate_cmd(hci_stack.config, ((hci_uart_config_t *)hci_stack.config)->baudrate_main, hci_stack.hci_packet_buffer); 1330 hci_send_cmd_packet(hci_stack.hci_packet_buffer, 3 + hci_stack.hci_packet_buffer[2]); 1331 break; 1332 case 2: // LOCAL BAUD CHANGE 1333 hci_stack.hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack.config)->baudrate_main); 1334 hci_stack.substate += 2; 1335 // break missing here for fall through 1336 1337 case 3: 1338 // Custom initialization 1339 if (hci_stack.control && hci_stack.control->next_cmd){ 1340 int valid_cmd = (*hci_stack.control->next_cmd)(hci_stack.config, hci_stack.hci_packet_buffer); 1341 if (valid_cmd){ 1342 int size = 3 + hci_stack.hci_packet_buffer[2]; 1343 hci_stack.hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack.hci_packet_buffer, size); 1344 hci_stack.substate = 4; // more init commands 1345 break; 1346 } 1347 log_info("hci_run: init script done\n\r"); 1348 } 1349 // otherwise continue 1350 hci_send_cmd(&hci_read_bd_addr); 1351 break; 1352 case 4: 1353 hci_send_cmd(&hci_read_buffer_size); 1354 break; 1355 case 5: 1356 hci_send_cmd(&hci_read_local_supported_features); 1357 break; 1358 case 6: 1359 if (hci_le_supported()){ 1360 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 1361 } else { 1362 // Kensington Bluetoot 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 1363 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 1364 } 1365 1366 // skip Classic init commands for LE only chipsets 1367 if (!hci_classic_supported()){ 1368 if (hci_le_supported()){ 1369 hci_stack.substate = 11 << 1; // skip all classic command 1370 } else { 1371 log_error("Neither BR/EDR nor LE supported"); 1372 hci_stack.substate = 13 << 1; // skip all 1373 } 1374 } 1375 break; 1376 case 7: 1377 if (hci_ssp_supported()){ 1378 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack.ssp_enable); 1379 break; 1380 } 1381 hci_stack.substate += 2; 1382 // break missing here for fall through 1383 1384 case 8: 1385 // ca. 15 sec 1386 hci_send_cmd(&hci_write_page_timeout, 0x6000); 1387 break; 1388 case 9: 1389 hci_send_cmd(&hci_write_class_of_device, hci_stack.class_of_device); 1390 break; 1391 case 10: 1392 if (hci_stack.local_name){ 1393 hci_send_cmd(&hci_write_local_name, hci_stack.local_name); 1394 } else { 1395 char hostname[30]; 1396 #ifdef EMBEDDED 1397 // BTstack-11:22:33:44:55:66 1398 strcpy(hostname, "BTstack "); 1399 strcat(hostname, bd_addr_to_str(hci_stack.local_bd_addr)); 1400 printf("---> Name %s\n", hostname); 1401 #else 1402 // hostname for POSIX systems 1403 gethostname(hostname, 30); 1404 hostname[29] = '\0'; 1405 #endif 1406 hci_send_cmd(&hci_write_local_name, hostname); 1407 } 1408 break; 1409 case 11: 1410 hci_send_cmd(&hci_write_scan_enable, (hci_stack.connectable << 1) | hci_stack.discoverable); // page scan 1411 if (!hci_le_supported()){ 1412 // SKIP LE init for Classic only configuration 1413 hci_stack.substate = 13 << 1; 1414 } 1415 break; 1416 1417 #ifdef HAVE_BLE 1418 // LE INIT 1419 case 12: 1420 hci_send_cmd(&hci_le_read_buffer_size); 1421 break; 1422 case 13: 1423 // LE Supported Host = 1, Simultaneous Host = 0 1424 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 1425 break; 1426 #endif 1427 1428 // DONE 1429 case 14: 1430 // done. 1431 hci_stack.state = HCI_STATE_WORKING; 1432 hci_emit_state(); 1433 break; 1434 default: 1435 break; 1436 } 1437 hci_stack.substate++; 1438 break; 1439 1440 case HCI_STATE_HALTING: 1441 1442 log_info("HCI_STATE_HALTING\n"); 1443 // close all open connections 1444 connection = (hci_connection_t *) hci_stack.connections; 1445 if (connection){ 1446 1447 // send disconnect 1448 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1449 1450 log_info("HCI_STATE_HALTING, connection %p, handle %u\n", connection, (uint16_t)connection->con_handle); 1451 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1452 1453 // send disconnected event right away - causes higher layer connections to get closed, too. 1454 hci_shutdown_connection(connection); 1455 return; 1456 } 1457 log_info("HCI_STATE_HALTING, calling off\n"); 1458 1459 // switch mode 1460 hci_power_control_off(); 1461 1462 log_info("HCI_STATE_HALTING, emitting state\n"); 1463 hci_emit_state(); 1464 log_info("HCI_STATE_HALTING, done\n"); 1465 break; 1466 1467 case HCI_STATE_FALLING_ASLEEP: 1468 switch(hci_stack.substate) { 1469 case 0: 1470 log_info("HCI_STATE_FALLING_ASLEEP\n"); 1471 // close all open connections 1472 connection = (hci_connection_t *) hci_stack.connections; 1473 1474 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1475 // don't close connections, if H4 supports power management 1476 if (bt_control_iphone_power_management_enabled()){ 1477 connection = NULL; 1478 } 1479 #endif 1480 if (connection){ 1481 1482 // send disconnect 1483 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1484 1485 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u\n", connection, (uint16_t)connection->con_handle); 1486 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1487 1488 // send disconnected event right away - causes higher layer connections to get closed, too. 1489 hci_shutdown_connection(connection); 1490 return; 1491 } 1492 1493 if (hci_classic_supported()){ 1494 // disable page and inquiry scan 1495 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1496 1497 log_info("HCI_STATE_HALTING, disabling inq scans\n"); 1498 hci_send_cmd(&hci_write_scan_enable, hci_stack.connectable << 1); // drop inquiry scan but keep page scan 1499 1500 // continue in next sub state 1501 hci_stack.substate++; 1502 break; 1503 } 1504 // fall through for ble-only chips 1505 1506 case 2: 1507 log_info("HCI_STATE_HALTING, calling sleep\n"); 1508 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1509 // don't actually go to sleep, if H4 supports power management 1510 if (bt_control_iphone_power_management_enabled()){ 1511 // SLEEP MODE reached 1512 hci_stack.state = HCI_STATE_SLEEPING; 1513 hci_emit_state(); 1514 break; 1515 } 1516 #endif 1517 // switch mode 1518 hci_power_control_sleep(); // changes hci_stack.state to SLEEP 1519 hci_emit_state(); 1520 break; 1521 1522 default: 1523 break; 1524 } 1525 break; 1526 1527 default: 1528 break; 1529 } 1530 } 1531 1532 int hci_send_cmd_packet(uint8_t *packet, int size){ 1533 bd_addr_t addr; 1534 hci_connection_t * conn; 1535 // house-keeping 1536 1537 // create_connection? 1538 if (IS_COMMAND(packet, hci_create_connection)){ 1539 bt_flip_addr(addr, &packet[3]); 1540 log_info("Create_connection to %s\n", bd_addr_to_str(addr)); 1541 conn = connection_for_address(addr); 1542 if (conn) { 1543 // if connection exists 1544 if (conn->state == OPEN) { 1545 // and OPEN, emit connection complete command 1546 hci_emit_connection_complete(conn, 0); 1547 } 1548 // otherwise, just ignore as it is already in the open process 1549 return 0; // don't sent packet to controller 1550 1551 } 1552 // create connection struct and register, state = SENT_CREATE_CONNECTION 1553 conn = create_connection_for_addr(addr); 1554 if (!conn){ 1555 // notify client that alloc failed 1556 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 1557 return 0; // don't sent packet to controller 1558 } 1559 conn->state = SENT_CREATE_CONNECTION; 1560 } 1561 1562 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 1563 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 1564 } 1565 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 1566 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 1567 } 1568 1569 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 1570 if (hci_stack.remote_device_db){ 1571 bt_flip_addr(addr, &packet[3]); 1572 hci_stack.remote_device_db->delete_link_key(&addr); 1573 } 1574 } 1575 1576 #ifdef HAVE_BLE 1577 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 1578 hci_stack.adv_addr_type = packet[8]; 1579 } 1580 if (IS_COMMAND(packet, hci_le_set_random_address)){ 1581 bt_flip_addr(hci_stack.adv_address, &packet[3]); 1582 } 1583 #endif 1584 1585 1586 hci_stack.num_cmd_packets--; 1587 return hci_stack.hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 1588 } 1589 1590 // disconnect because of security block 1591 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 1592 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1593 if (!connection) return; 1594 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 1595 } 1596 1597 1598 // Configure Secure Simple Pairing 1599 1600 // enable will enable SSP during init 1601 void hci_ssp_set_enable(int enable){ 1602 hci_stack.ssp_enable = enable; 1603 } 1604 1605 int hci_local_ssp_activated(){ 1606 return hci_ssp_supported() && hci_stack.ssp_enable; 1607 } 1608 1609 // if set, BTstack will respond to io capability request using authentication requirement 1610 void hci_ssp_set_io_capability(int io_capability){ 1611 hci_stack.ssp_io_capability = io_capability; 1612 } 1613 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 1614 hci_stack.ssp_authentication_requirement = authentication_requirement; 1615 } 1616 1617 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 1618 void hci_ssp_set_auto_accept(int auto_accept){ 1619 hci_stack.ssp_auto_accept = auto_accept; 1620 } 1621 1622 /** 1623 * pre: numcmds >= 0 - it's allowed to send a command to the controller 1624 */ 1625 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 1626 va_list argptr; 1627 va_start(argptr, cmd); 1628 uint16_t size = hci_create_cmd_internal(hci_stack.hci_packet_buffer, cmd, argptr); 1629 va_end(argptr); 1630 return hci_send_cmd_packet(hci_stack.hci_packet_buffer, size); 1631 } 1632 1633 // Create various non-HCI events. 1634 // TODO: generalize, use table similar to hci_create_command 1635 1636 void hci_emit_state(){ 1637 log_info("BTSTACK_EVENT_STATE %u", hci_stack.state); 1638 uint8_t event[3]; 1639 event[0] = BTSTACK_EVENT_STATE; 1640 event[1] = sizeof(event) - 2; 1641 event[2] = hci_stack.state; 1642 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1643 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1644 } 1645 1646 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 1647 uint8_t event[13]; 1648 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 1649 event[1] = sizeof(event) - 2; 1650 event[2] = status; 1651 bt_store_16(event, 3, conn->con_handle); 1652 bt_flip_addr(&event[5], conn->address); 1653 event[11] = 1; // ACL connection 1654 event[12] = 0; // encryption disabled 1655 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1656 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1657 } 1658 1659 void hci_emit_disconnection_complete(uint16_t handle, uint8_t reason){ 1660 uint8_t event[6]; 1661 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 1662 event[1] = sizeof(event) - 2; 1663 event[2] = 0; // status = OK 1664 bt_store_16(event, 3, handle); 1665 event[5] = reason; 1666 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1667 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1668 } 1669 1670 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 1671 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 1672 uint8_t event[4]; 1673 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 1674 event[1] = sizeof(event) - 2; 1675 bt_store_16(event, 2, conn->con_handle); 1676 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1677 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1678 } 1679 1680 void hci_emit_nr_connections_changed(){ 1681 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 1682 uint8_t event[3]; 1683 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 1684 event[1] = sizeof(event) - 2; 1685 event[2] = nr_hci_connections(); 1686 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1687 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1688 } 1689 1690 void hci_emit_hci_open_failed(){ 1691 log_info("BTSTACK_EVENT_POWERON_FAILED"); 1692 uint8_t event[2]; 1693 event[0] = BTSTACK_EVENT_POWERON_FAILED; 1694 event[1] = sizeof(event) - 2; 1695 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1696 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1697 } 1698 1699 #ifndef EMBEDDED 1700 void hci_emit_btstack_version() { 1701 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 1702 uint8_t event[6]; 1703 event[0] = BTSTACK_EVENT_VERSION; 1704 event[1] = sizeof(event) - 2; 1705 event[2] = BTSTACK_MAJOR; 1706 event[3] = BTSTACK_MINOR; 1707 bt_store_16(event, 4, BTSTACK_REVISION); 1708 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1709 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1710 } 1711 #endif 1712 1713 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 1714 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 1715 uint8_t event[3]; 1716 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 1717 event[1] = sizeof(event) - 2; 1718 event[2] = enabled; 1719 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1720 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1721 } 1722 1723 void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){ 1724 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 1725 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 1726 event[1] = sizeof(event) - 2 - 1; 1727 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 1728 bt_flip_addr(&event[3], *addr); 1729 memcpy(&event[9], name, 248); 1730 1731 event[9+248] = 0; // assert \0 for log_info 1732 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(*addr), &event[9]); 1733 1734 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 1735 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 1736 } 1737 1738 void hci_emit_discoverable_enabled(uint8_t enabled){ 1739 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 1740 uint8_t event[3]; 1741 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 1742 event[1] = sizeof(event) - 2; 1743 event[2] = enabled; 1744 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1745 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1746 } 1747 1748 void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){ 1749 log_info("hci_emit_security_level %u for handle %x", level, con_handle); 1750 uint8_t event[5]; 1751 int pos = 0; 1752 event[pos++] = GAP_SECURITY_LEVEL; 1753 event[pos++] = sizeof(event) - 2; 1754 bt_store_16(event, 2, con_handle); 1755 pos += 2; 1756 event[pos++] = level; 1757 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1758 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1759 } 1760 1761 // query if remote side supports SSP 1762 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 1763 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1764 if (!connection) return 0; 1765 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 1766 } 1767 1768 int hci_ssp_supported_on_both_sides(hci_con_handle_t handle){ 1769 return hci_local_ssp_activated() && hci_remote_ssp_supported(handle); 1770 } 1771 1772 // GAP API 1773 /** 1774 * @bbrief enable/disable bonding. default is enabled 1775 * @praram enabled 1776 */ 1777 void gap_set_bondable_mode(int enable){ 1778 hci_stack.bondable = enable ? 1 : 0; 1779 } 1780 1781 /** 1782 * @brief map link keys to security levels 1783 */ 1784 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 1785 switch (link_key_type){ 1786 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 1787 return LEVEL_4; 1788 case COMBINATION_KEY: 1789 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 1790 return LEVEL_3; 1791 default: 1792 return LEVEL_2; 1793 } 1794 } 1795 1796 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 1797 if (!connection) return LEVEL_0; 1798 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 1799 return gap_security_level_for_link_key_type(connection->link_key_type); 1800 } 1801 1802 1803 /** 1804 * @brief get current security level 1805 */ 1806 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 1807 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1808 if (!connection) return LEVEL_0; 1809 return gap_security_level_for_connection(connection); 1810 } 1811 1812 /** 1813 * @brief request connection to device to 1814 * @result GAP_AUTHENTICATION_RESULT 1815 */ 1816 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 1817 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1818 if (!connection){ 1819 hci_emit_security_level(con_handle, LEVEL_0); 1820 return; 1821 } 1822 gap_security_level_t current_level = gap_security_level(con_handle); 1823 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 1824 if (current_level >= requested_level){ 1825 hci_emit_security_level(con_handle, current_level); 1826 return; 1827 } 1828 1829 connection->requested_security_level = requested_level; 1830 1831 // would enabling ecnryption suffice (>= LEVEL_2)? 1832 if (hci_stack.remote_device_db){ 1833 link_key_type_t link_key_type; 1834 link_key_t link_key; 1835 if (hci_stack.remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type)){ 1836 if (gap_security_level_for_link_key_type(link_key_type) >= requested_level){ 1837 connection->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 1838 return; 1839 } 1840 } 1841 } 1842 1843 // setup SSP AuthRequirements, we need MITM to go higher 1844 hci_stack.ssp_authentication_requirement |= 1; // MITM required 1845 1846 // try to authenticate connection 1847 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 1848 } 1849