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