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 "btstack-config.h" 45 46 #include "hci.h" 47 #include "gap.h" 48 49 #include <stdarg.h> 50 #include <string.h> 51 #include <stdio.h> 52 53 #ifndef EMBEDDED 54 #include <unistd.h> // gethostbyname 55 #include <btstack/version.h> 56 #endif 57 58 #include "btstack_memory.h" 59 #include "debug.h" 60 #include "hci_dump.h" 61 62 #include <btstack/hci_cmds.h> 63 64 #define HCI_CONNECTION_TIMEOUT_MS 10000 65 66 #define HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP 11 67 68 #ifdef USE_BLUETOOL 69 #include "bt_control_iphone.h" 70 #endif 71 72 static void hci_update_scan_enable(void); 73 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection); 74 75 // the STACK is here 76 static hci_stack_t hci_stack; 77 78 /** 79 * get connection for a given handle 80 * 81 * @return connection OR NULL, if not found 82 */ 83 hci_connection_t * hci_connection_for_handle(hci_con_handle_t con_handle){ 84 linked_item_t *it; 85 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 86 if ( ((hci_connection_t *) it)->con_handle == con_handle){ 87 return (hci_connection_t *) it; 88 } 89 } 90 return NULL; 91 } 92 93 static void hci_connection_timeout_handler(timer_source_t *timer){ 94 hci_connection_t * connection = (hci_connection_t *) linked_item_get_user(&timer->item); 95 #ifdef HAVE_TIME 96 struct timeval tv; 97 gettimeofday(&tv, NULL); 98 if (tv.tv_sec >= connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000) { 99 // connections might be timed out 100 hci_emit_l2cap_check_timeout(connection); 101 } 102 #endif 103 #ifdef HAVE_TICK 104 if (embedded_get_ticks() > connection->timestamp + embedded_ticks_for_ms(HCI_CONNECTION_TIMEOUT_MS)){ 105 // connections might be timed out 106 hci_emit_l2cap_check_timeout(connection); 107 } 108 #endif 109 run_loop_set_timer(timer, HCI_CONNECTION_TIMEOUT_MS); 110 run_loop_add_timer(timer); 111 } 112 113 static void hci_connection_timestamp(hci_connection_t *connection){ 114 #ifdef HAVE_TIME 115 gettimeofday(&connection->timestamp, NULL); 116 #endif 117 #ifdef HAVE_TICK 118 connection->timestamp = embedded_get_ticks(); 119 #endif 120 } 121 122 /** 123 * create connection for given address 124 * 125 * @return connection OR NULL, if no memory left 126 */ 127 static hci_connection_t * create_connection_for_addr(bd_addr_t addr){ 128 hci_connection_t * conn = (hci_connection_t *) btstack_memory_hci_connection_get(); 129 if (!conn) return NULL; 130 BD_ADDR_COPY(conn->address, addr); 131 conn->con_handle = 0xffff; 132 conn->authentication_flags = AUTH_FLAGS_NONE; 133 conn->bonding_flags = 0; 134 conn->requested_security_level = LEVEL_0; 135 linked_item_set_user(&conn->timeout.item, conn); 136 conn->timeout.process = hci_connection_timeout_handler; 137 hci_connection_timestamp(conn); 138 conn->acl_recombination_length = 0; 139 conn->acl_recombination_pos = 0; 140 conn->num_acl_packets_sent = 0; 141 linked_list_add(&hci_stack.connections, (linked_item_t *) conn); 142 return conn; 143 } 144 145 /** 146 * get connection for given address 147 * 148 * @return connection OR NULL, if not found 149 */ 150 static hci_connection_t * connection_for_address(bd_addr_t address){ 151 linked_item_t *it; 152 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 153 if ( ! BD_ADDR_CMP( ((hci_connection_t *) it)->address, address) ){ 154 return (hci_connection_t *) it; 155 } 156 } 157 return NULL; 158 } 159 160 inline static void connectionSetAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 161 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags | flags); 162 } 163 164 inline static void connectionClearAuthenticationFlags(hci_connection_t * conn, hci_authentication_flags_t flags){ 165 conn->authentication_flags = (hci_authentication_flags_t)(conn->authentication_flags & ~flags); 166 } 167 168 169 /** 170 * add authentication flags and reset timer 171 */ 172 static void hci_add_connection_flags_for_flipped_bd_addr(uint8_t *bd_addr, hci_authentication_flags_t flags){ 173 bd_addr_t addr; 174 bt_flip_addr(addr, *(bd_addr_t *) bd_addr); 175 hci_connection_t * conn = connection_for_address(addr); 176 if (conn) { 177 connectionSetAuthenticationFlags(conn, flags); 178 hci_connection_timestamp(conn); 179 } 180 } 181 182 int hci_authentication_active_for_handle(hci_con_handle_t handle){ 183 hci_connection_t * conn = hci_connection_for_handle(handle); 184 if (!conn) return 0; 185 if (conn->authentication_flags & LEGACY_PAIRING_ACTIVE) return 1; 186 if (conn->authentication_flags & SSP_PAIRING_ACTIVE) return 1; 187 return 0; 188 } 189 190 void hci_drop_link_key_for_bd_addr(bd_addr_t *addr){ 191 if (hci_stack.remote_device_db) { 192 hci_stack.remote_device_db->delete_link_key(addr); 193 } 194 } 195 196 197 /** 198 * count connections 199 */ 200 static int nr_hci_connections(void){ 201 int count = 0; 202 linked_item_t *it; 203 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next, count++); 204 return count; 205 } 206 207 /** 208 * Dummy handler called by HCI 209 */ 210 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 211 } 212 213 uint8_t hci_number_outgoing_packets(hci_con_handle_t handle){ 214 hci_connection_t * connection = hci_connection_for_handle(handle); 215 if (!connection) { 216 log_error("hci_number_outgoing_packets connectino for handle %u does not exist!\n", handle); 217 return 0; 218 } 219 return connection->num_acl_packets_sent; 220 } 221 222 uint8_t hci_number_free_acl_slots(){ 223 uint8_t free_slots = hci_stack.total_num_acl_packets; 224 linked_item_t *it; 225 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 226 hci_connection_t * connection = (hci_connection_t *) it; 227 if (free_slots < connection->num_acl_packets_sent) { 228 log_error("hci_number_free_acl_slots: sum of outgoing packets > total acl packets!\n"); 229 return 0; 230 } 231 free_slots -= connection->num_acl_packets_sent; 232 } 233 return free_slots; 234 } 235 236 int hci_can_send_packet_now(uint8_t packet_type){ 237 238 // check for async hci transport implementations 239 if (hci_stack.hci_transport->can_send_packet_now){ 240 if (!hci_stack.hci_transport->can_send_packet_now(packet_type)){ 241 return 0; 242 } 243 } 244 245 // check regular Bluetooth flow control 246 switch (packet_type) { 247 case HCI_ACL_DATA_PACKET: 248 return hci_number_free_acl_slots(); 249 case HCI_COMMAND_DATA_PACKET: 250 return hci_stack.num_cmd_packets; 251 default: 252 return 0; 253 } 254 } 255 256 int hci_send_acl_packet(uint8_t *packet, int size){ 257 258 // check for free places on BT module 259 if (!hci_number_free_acl_slots()) return BTSTACK_ACL_BUFFERS_FULL; 260 261 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 262 hci_connection_t *connection = hci_connection_for_handle( con_handle); 263 if (!connection) return 0; 264 hci_connection_timestamp(connection); 265 266 // count packet 267 connection->num_acl_packets_sent++; 268 // log_info("hci_send_acl_packet - handle %u, sent %u\n", connection->con_handle, connection->num_acl_packets_sent); 269 270 // send packet 271 int err = hci_stack.hci_transport->send_packet(HCI_ACL_DATA_PACKET, packet, size); 272 273 return err; 274 } 275 276 static void acl_handler(uint8_t *packet, int size){ 277 278 // log_info("acl_handler: size %u", size); 279 280 // get info 281 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 282 hci_connection_t *conn = hci_connection_for_handle(con_handle); 283 uint8_t acl_flags = READ_ACL_FLAGS(packet); 284 uint16_t acl_length = READ_ACL_LENGTH(packet); 285 286 // ignore non-registered handle 287 if (!conn){ 288 log_error( "hci.c: acl_handler called with non-registered handle %u!\n" , con_handle); 289 return; 290 } 291 292 // assert packet is complete 293 if (acl_length + 4 != size){ 294 log_error("hci.c: acl_handler called with ACL packet of wrong size %u, expected %u => dropping packet", size, acl_length + 4); 295 return; 296 } 297 298 // update idle timestamp 299 hci_connection_timestamp(conn); 300 301 // handle different packet types 302 switch (acl_flags & 0x03) { 303 304 case 0x01: // continuation fragment 305 306 // sanity check 307 if (conn->acl_recombination_pos == 0) { 308 log_error( "ACL Cont Fragment but no first fragment for handle 0x%02x\n", con_handle); 309 return; 310 } 311 312 // append fragment payload (header already stored) 313 memcpy(&conn->acl_recombination_buffer[conn->acl_recombination_pos], &packet[4], acl_length ); 314 conn->acl_recombination_pos += acl_length; 315 316 // log_error( "ACL Cont Fragment: acl_len %u, combined_len %u, l2cap_len %u\n", acl_length, 317 // conn->acl_recombination_pos, conn->acl_recombination_length); 318 319 // forward complete L2CAP packet if complete. 320 if (conn->acl_recombination_pos >= conn->acl_recombination_length + 4 + 4){ // pos already incl. ACL header 321 322 hci_stack.packet_handler(HCI_ACL_DATA_PACKET, conn->acl_recombination_buffer, conn->acl_recombination_pos); 323 // reset recombination buffer 324 conn->acl_recombination_length = 0; 325 conn->acl_recombination_pos = 0; 326 } 327 break; 328 329 case 0x02: { // first fragment 330 331 // sanity check 332 if (conn->acl_recombination_pos) { 333 log_error( "ACL First Fragment but data in buffer for handle 0x%02x\n", con_handle); 334 return; 335 } 336 337 // peek into L2CAP packet! 338 uint16_t l2cap_length = READ_L2CAP_LENGTH( packet ); 339 340 // log_info( "ACL First Fragment: acl_len %u, l2cap_len %u\n", acl_length, l2cap_length); 341 342 // compare fragment size to L2CAP packet size 343 if (acl_length >= l2cap_length + 4){ 344 345 // forward fragment as L2CAP packet 346 hci_stack.packet_handler(HCI_ACL_DATA_PACKET, packet, acl_length + 4); 347 348 } else { 349 // store first fragment and tweak acl length for complete package 350 memcpy(conn->acl_recombination_buffer, packet, acl_length + 4); 351 conn->acl_recombination_pos = acl_length + 4; 352 conn->acl_recombination_length = l2cap_length; 353 bt_store_16(conn->acl_recombination_buffer, 2, l2cap_length +4); 354 } 355 break; 356 357 } 358 default: 359 log_error( "hci.c: acl_handler called with invalid packet boundary flags %u\n", acl_flags & 0x03); 360 return; 361 } 362 363 // execute main loop 364 hci_run(); 365 } 366 367 static void hci_shutdown_connection(hci_connection_t *conn){ 368 log_info("Connection closed: handle %u, %s\n", conn->con_handle, bd_addr_to_str(conn->address)); 369 370 // cancel all l2cap connections 371 hci_emit_disconnection_complete(conn->con_handle, 0x16); // terminated by local host 372 373 run_loop_remove_timer(&conn->timeout); 374 375 linked_list_remove(&hci_stack.connections, (linked_item_t *) conn); 376 btstack_memory_hci_connection_free( conn ); 377 378 // now it's gone 379 hci_emit_nr_connections_changed(); 380 } 381 382 static const uint16_t packet_type_sizes[] = { 383 0, HCI_ACL_2DH1_SIZE, HCI_ACL_3DH1_SIZE, HCI_ACL_DM1_SIZE, 384 HCI_ACL_DH1_SIZE, 0, 0, 0, 385 HCI_ACL_2DH3_SIZE, HCI_ACL_3DH3_SIZE, HCI_ACL_DM3_SIZE, HCI_ACL_DH3_SIZE, 386 HCI_ACL_2DH5_SIZE, HCI_ACL_3DH5_SIZE, HCI_ACL_DM5_SIZE, HCI_ACL_DH5_SIZE 387 }; 388 static const uint8_t packet_type_feature_requirement_bit[] = { 389 0, // 3 slot packets 390 1, // 5 slot packets 391 25, // EDR 2 mpbs 392 26, // EDR 3 mbps 393 39, // 3 slot EDR packts 394 40, // 5 slot EDR packet 395 }; 396 static const uint16_t packet_type_feature_packet_mask[] = { 397 0x0f00, // 3 slot packets 398 0xf000, // 5 slot packets 399 0x1102, // EDR 2 mpbs 400 0x2204, // EDR 3 mbps 401 0x0300, // 3 slot EDR packts 402 0x3000, // 5 slot EDR packet 403 }; 404 405 static uint16_t hci_acl_packet_types_for_buffer_size_and_local_features(uint16_t buffer_size, uint8_t * local_supported_features){ 406 // enable packet types based on size 407 uint16_t packet_types = 0; 408 int i; 409 for (i=0;i<16;i++){ 410 if (packet_type_sizes[i] == 0) continue; 411 if (packet_type_sizes[i] <= buffer_size){ 412 packet_types |= 1 << i; 413 } 414 } 415 // disable packet types due to missing local supported features 416 for (i=0;i<sizeof(packet_type_feature_requirement_bit);i++){ 417 int bit_idx = packet_type_feature_requirement_bit[i]; 418 int feature_set = (local_supported_features[bit_idx >> 3] & (1<<(bit_idx & 7))) != 0; 419 if (feature_set) continue; 420 log_info("Features bit %02u is not set, removing packet types 0x%04x", bit_idx, packet_type_feature_packet_mask[i]); 421 packet_types &= ~packet_type_feature_packet_mask[i]; 422 } 423 // flip bits for "may not be used" 424 packet_types ^= 0x3306; 425 return packet_types; 426 } 427 428 uint16_t hci_usable_acl_packet_types(void){ 429 return hci_stack.packet_types; 430 } 431 432 uint8_t* hci_get_outgoing_acl_packet_buffer(void){ 433 // hci packet buffer is >= acl data packet length 434 return hci_stack.hci_packet_buffer; 435 } 436 437 uint16_t hci_max_acl_data_packet_length(void){ 438 return hci_stack.acl_data_packet_length; 439 } 440 441 int hci_ssp_supported(void){ 442 // No 51, byte 6, bit 3 443 return (hci_stack.local_supported_features[6] & (1 << 3)) != 0; 444 } 445 446 int hci_classic_supported(void){ 447 // No 37, byte 4, bit 5, = No BR/EDR Support 448 return (hci_stack.local_supported_features[4] & (1 << 5)) == 0; 449 } 450 451 int hci_le_supported(void){ 452 // No 37, byte 4, bit 6 = LE Supported (Controller) 453 #ifdef HAVE_BLE 454 return (hci_stack.local_supported_features[4] & (1 << 6)) != 0; 455 #else 456 return 0; 457 #endif 458 } 459 460 // get addr type and address used in advertisement packets 461 void hci_le_advertisement_address(uint8_t * addr_type, bd_addr_t * addr){ 462 *addr_type = hci_stack.adv_addr_type; 463 if (hci_stack.adv_addr_type){ 464 memcpy(addr, hci_stack.adv_address, 6); 465 } else { 466 memcpy(addr, hci_stack.local_bd_addr, 6); 467 } 468 } 469 470 // avoid huge local variables 471 #ifndef EMBEDDED 472 static device_name_t device_name; 473 #endif 474 static void event_handler(uint8_t *packet, int size){ 475 476 uint16_t event_length = packet[1]; 477 478 // assert packet is complete 479 if (size != event_length + 2){ 480 log_error("hci.c: event_handler called with event packet of wrong size %u, expected %u => dropping packet", size, event_length + 2); 481 return; 482 } 483 484 bd_addr_t addr; 485 uint8_t link_type; 486 hci_con_handle_t handle; 487 hci_connection_t * conn; 488 int i; 489 490 // printf("HCI:EVENT:%02x\n", packet[0]); 491 492 switch (packet[0]) { 493 494 case HCI_EVENT_COMMAND_COMPLETE: 495 // get num cmd packets 496 // log_info("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u\n", hci_stack.num_cmd_packets, packet[2]); 497 hci_stack.num_cmd_packets = packet[2]; 498 499 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 500 // from offset 5 501 // status 502 // "The HC_ACL_Data_Packet_Length return parameter will be used to determine the size of the L2CAP segments contained in ACL Data Packets" 503 hci_stack.acl_data_packet_length = READ_BT_16(packet, 6); 504 // ignore: SCO data packet len (8) 505 hci_stack.total_num_acl_packets = packet[9]; 506 // ignore: total num SCO packets 507 if (hci_stack.state == HCI_STATE_INITIALIZING){ 508 // determine usable ACL payload size 509 if (HCI_ACL_PAYLOAD_SIZE < hci_stack.acl_data_packet_length){ 510 hci_stack.acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 511 } 512 log_info("hci_read_buffer_size: used size %u, count %u\n", 513 hci_stack.acl_data_packet_length, hci_stack.total_num_acl_packets); 514 } 515 } 516 #ifdef HAVE_BLE 517 if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_buffer_size)){ 518 hci_stack.le_data_packet_length = READ_BT_16(packet, 6); 519 hci_stack.total_num_le_packets = packet[8]; 520 log_info("hci_le_read_buffer_size: size %u, count %u\n", hci_stack.le_data_packet_length, hci_stack.total_num_le_packets); 521 } 522 #endif 523 // Dump local address 524 if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)) { 525 bt_flip_addr(hci_stack.local_bd_addr, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1]); 526 log_info("Local Address, Status: 0x%02x: Addr: %s\n", 527 packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE], bd_addr_to_str(hci_stack.local_bd_addr)); 528 } 529 if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 530 hci_emit_discoverable_enabled(hci_stack.discoverable); 531 } 532 // Note: HCI init checks 533 if (COMMAND_COMPLETE_EVENT(packet, hci_read_local_supported_features)){ 534 memcpy(hci_stack.local_supported_features, &packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE+1], 8); 535 log_info("Local Supported Features: 0x%02x%02x%02x%02x%02x%02x%02x%02x", 536 hci_stack.local_supported_features[0], hci_stack.local_supported_features[1], 537 hci_stack.local_supported_features[2], hci_stack.local_supported_features[3], 538 hci_stack.local_supported_features[4], hci_stack.local_supported_features[5], 539 hci_stack.local_supported_features[6], hci_stack.local_supported_features[7]); 540 541 // determine usable ACL packet types based buffer size and supported features 542 hci_stack.packet_types = hci_acl_packet_types_for_buffer_size_and_local_features(hci_stack.acl_data_packet_length, &hci_stack.local_supported_features[0]); 543 log_info("packet types %04x", hci_stack.packet_types); 544 545 // Classic/LE 546 log_info("BR/EDR support %u, LE support %u", hci_classic_supported(), hci_le_supported()); 547 } 548 break; 549 550 case HCI_EVENT_COMMAND_STATUS: 551 // get num cmd packets 552 // log_info("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u\n", hci_stack.num_cmd_packets, packet[3]); 553 hci_stack.num_cmd_packets = packet[3]; 554 break; 555 556 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 557 for (i=0; i<packet[2];i++){ 558 handle = READ_BT_16(packet, 3 + 2*i); 559 uint16_t num_packets = READ_BT_16(packet, 3 + packet[2]*2 + 2*i); 560 conn = hci_connection_for_handle(handle); 561 if (!conn){ 562 log_error("hci_number_completed_packet lists unused con handle %u\n", handle); 563 continue; 564 } 565 conn->num_acl_packets_sent -= num_packets; 566 // log_info("hci_number_completed_packet %u processed for handle %u, outstanding %u\n", num_packets, handle, conn->num_acl_packets_sent); 567 } 568 break; 569 570 case HCI_EVENT_CONNECTION_REQUEST: 571 bt_flip_addr(addr, &packet[2]); 572 // TODO: eval COD 8-10 573 link_type = packet[11]; 574 log_info("Connection_incoming: %s, type %u\n", bd_addr_to_str(addr), link_type); 575 if (link_type == 1) { // ACL 576 conn = connection_for_address(addr); 577 if (!conn) { 578 conn = create_connection_for_addr(addr); 579 } 580 if (!conn) { 581 // CONNECTION REJECTED DUE TO LIMITED RESOURCES (0X0D) 582 hci_stack.decline_reason = 0x0d; 583 BD_ADDR_COPY(hci_stack.decline_addr, addr); 584 break; 585 } 586 conn->state = RECEIVED_CONNECTION_REQUEST; 587 hci_run(); 588 } else { 589 // SYNCHRONOUS CONNECTION LIMIT TO A DEVICE EXCEEDED (0X0A) 590 hci_stack.decline_reason = 0x0a; 591 BD_ADDR_COPY(hci_stack.decline_addr, addr); 592 } 593 break; 594 595 case HCI_EVENT_CONNECTION_COMPLETE: 596 // Connection management 597 bt_flip_addr(addr, &packet[5]); 598 log_info("Connection_complete (status=%u) %s\n", packet[2], bd_addr_to_str(addr)); 599 conn = connection_for_address(addr); 600 if (conn) { 601 if (!packet[2]){ 602 conn->state = OPEN; 603 conn->con_handle = READ_BT_16(packet, 3); 604 conn->bonding_flags |= BONDING_REQUEST_REMOTE_FEATURES; 605 606 // restart timer 607 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 608 run_loop_add_timer(&conn->timeout); 609 610 log_info("New connection: handle %u, %s\n", conn->con_handle, bd_addr_to_str(conn->address)); 611 612 hci_emit_nr_connections_changed(); 613 } else { 614 // notify client if dedicated bonding 615 if (conn->bonding_flags & BONDING_DEDICATED){ 616 hci_emit_dedicated_bonding_result(conn, packet[2]); 617 } 618 619 // connection failed, remove entry 620 linked_list_remove(&hci_stack.connections, (linked_item_t *) conn); 621 btstack_memory_hci_connection_free( conn ); 622 623 // if authentication error, also delete link key 624 if (packet[2] == 0x05) { 625 hci_drop_link_key_for_bd_addr(&addr); 626 } 627 } 628 } 629 break; 630 631 case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 632 handle = READ_BT_16(packet, 3); 633 conn = hci_connection_for_handle(handle); 634 if (!conn) break; 635 if (!packet[2]){ 636 uint8_t * features = &packet[5]; 637 if (features[6] & (1 << 3)){ 638 conn->bonding_flags |= BONDING_REMOTE_SUPPORTS_SSP; 639 } 640 } 641 conn->bonding_flags |= BONDING_RECEIVED_REMOTE_FEATURES; 642 log_info("HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE, bonding flags %x", conn->bonding_flags); 643 if (conn->bonding_flags & BONDING_DEDICATED){ 644 conn->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 645 } 646 break; 647 648 case HCI_EVENT_LINK_KEY_REQUEST: 649 log_info("HCI_EVENT_LINK_KEY_REQUEST\n"); 650 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST); 651 // non-bondable mode: link key negative reply will be sent by HANDLE_LINK_KEY_REQUEST 652 if (hci_stack.bondable && !hci_stack.remote_device_db) break; 653 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], HANDLE_LINK_KEY_REQUEST); 654 hci_run(); 655 // request handled by hci_run() as HANDLE_LINK_KEY_REQUEST gets set 656 return; 657 658 case HCI_EVENT_LINK_KEY_NOTIFICATION: { 659 bt_flip_addr(addr, &packet[2]); 660 conn = connection_for_address(addr); 661 if (!conn) break; 662 conn->authentication_flags |= RECV_LINK_KEY_NOTIFICATION; 663 link_key_type_t link_key_type = packet[24]; 664 // Change Connection Encryption keeps link key type 665 if (link_key_type != CHANGED_COMBINATION_KEY){ 666 conn->link_key_type = link_key_type; 667 } 668 if (!hci_stack.remote_device_db) break; 669 hci_stack.remote_device_db->put_link_key(&addr, (link_key_t *) &packet[8], conn->link_key_type); 670 // still forward event to allow dismiss of pairing dialog 671 break; 672 } 673 674 case HCI_EVENT_PIN_CODE_REQUEST: 675 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], LEGACY_PAIRING_ACTIVE); 676 // non-bondable mode: pin code negative reply will be sent 677 if (!hci_stack.bondable){ 678 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], DENY_PIN_CODE_REQUEST); 679 hci_run(); 680 return; 681 } 682 // PIN CODE REQUEST means the link key request didn't succee -> delete stored link key 683 if (!hci_stack.remote_device_db) break; 684 bt_flip_addr(addr, &packet[2]); 685 hci_stack.remote_device_db->delete_link_key(&addr); 686 break; 687 688 case HCI_EVENT_IO_CAPABILITY_REQUEST: 689 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_IO_CAPABILITIES_REQUEST); 690 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_IO_CAPABILITIES_REPLY); 691 break; 692 693 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 694 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 695 if (!hci_stack.ssp_auto_accept) break; 696 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_CONFIRM_REPLY); 697 break; 698 699 case HCI_EVENT_USER_PASSKEY_REQUEST: 700 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SSP_PAIRING_ACTIVE); 701 if (!hci_stack.ssp_auto_accept) break; 702 hci_add_connection_flags_for_flipped_bd_addr(&packet[2], SEND_USER_PASSKEY_REPLY); 703 break; 704 705 case HCI_EVENT_ENCRYPTION_CHANGE: 706 handle = READ_BT_16(packet, 3); 707 conn = hci_connection_for_handle(handle); 708 if (!conn) break; 709 if (packet[2] == 0) { 710 if (packet[5]){ 711 conn->authentication_flags |= CONNECTION_ENCRYPTED; 712 } else { 713 conn->authentication_flags &= ~CONNECTION_ENCRYPTED; 714 } 715 } 716 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 717 break; 718 719 case HCI_EVENT_AUTHENTICATION_COMPLETE_EVENT: 720 handle = READ_BT_16(packet, 3); 721 conn = hci_connection_for_handle(handle); 722 if (!conn) break; 723 724 // dedicated bonding: send result and disconnect 725 if (conn->bonding_flags & BONDING_DEDICATED){ 726 conn->bonding_flags &= ~BONDING_DEDICATED; 727 hci_emit_dedicated_bonding_result( conn, packet[2]); 728 conn->bonding_flags |= BONDING_DISCONNECT_DEDICATED_DONE; 729 break; 730 } 731 732 if (packet[2] == 0 && gap_security_level_for_link_key_type(conn->link_key_type) >= conn->requested_security_level){ 733 // link key sufficient for requested security 734 conn->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 735 break; 736 } 737 // not enough 738 hci_emit_security_level(handle, gap_security_level_for_connection(conn)); 739 break; 740 741 #ifndef EMBEDDED 742 case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE: 743 if (!hci_stack.remote_device_db) break; 744 if (packet[2]) break; // status not ok 745 bt_flip_addr(addr, &packet[3]); 746 // fix for invalid remote names - terminate on 0xff 747 for (i=0; i<248;i++){ 748 if (packet[9+i] == 0xff){ 749 packet[9+i] = 0; 750 break; 751 } 752 } 753 memset(&device_name, 0, sizeof(device_name_t)); 754 strncpy((char*) device_name, (char*) &packet[9], 248); 755 hci_stack.remote_device_db->put_name(&addr, &device_name); 756 break; 757 758 case HCI_EVENT_INQUIRY_RESULT: 759 case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI: 760 if (!hci_stack.remote_device_db) break; 761 // first send inq result packet 762 hci_stack.packet_handler(HCI_EVENT_PACKET, packet, size); 763 // then send cached remote names 764 for (i=0; i<packet[2];i++){ 765 bt_flip_addr(addr, &packet[3+i*6]); 766 if (hci_stack.remote_device_db->get_name(&addr, &device_name)){ 767 hci_emit_remote_name_cached(&addr, &device_name); 768 } 769 } 770 return; 771 #endif 772 773 case HCI_EVENT_DISCONNECTION_COMPLETE: 774 if (!packet[2]){ 775 handle = READ_BT_16(packet, 3); 776 hci_connection_t * conn = hci_connection_for_handle(handle); 777 if (conn) { 778 hci_shutdown_connection(conn); 779 } 780 } 781 break; 782 783 case HCI_EVENT_HARDWARE_ERROR: 784 if(hci_stack.control && hci_stack.control->hw_error){ 785 (*hci_stack.control->hw_error)(); 786 } 787 break; 788 789 #ifdef HAVE_BLE 790 case HCI_EVENT_LE_META: 791 switch (packet[2]) { 792 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 793 // Connection management 794 bt_flip_addr(addr, &packet[8]); 795 log_info("LE Connection_complete (status=%u) %s\n", packet[3], bd_addr_to_str(addr)); 796 // LE connections are auto-accepted, so just create a connection if there isn't one already 797 conn = connection_for_address(addr); 798 if (packet[3]){ 799 if (conn){ 800 // outgoing connection failed, remove entry 801 linked_list_remove(&hci_stack.connections, (linked_item_t *) conn); 802 btstack_memory_hci_connection_free( conn ); 803 804 } 805 // if authentication error, also delete link key 806 if (packet[3] == 0x05) { 807 hci_drop_link_key_for_bd_addr(&addr); 808 } 809 break; 810 } 811 if (!conn){ 812 conn = create_connection_for_addr(addr); 813 } 814 if (!conn){ 815 // no memory 816 break; 817 } 818 819 conn->state = OPEN; 820 conn->con_handle = READ_BT_16(packet, 4); 821 822 // TODO: store - role, peer address type, conn_interval, conn_latency, supervision timeout, master clock 823 824 // restart timer 825 // run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 826 // run_loop_add_timer(&conn->timeout); 827 828 log_info("New connection: handle %u, %s\n", conn->con_handle, bd_addr_to_str(conn->address)); 829 830 hci_emit_nr_connections_changed(); 831 break; 832 833 // printf("LE buffer size: %u, count %u\n", READ_BT_16(packet,6), packet[8]); 834 835 default: 836 break; 837 } 838 break; 839 #endif 840 841 default: 842 break; 843 } 844 845 // handle BT initialization 846 if (hci_stack.state == HCI_STATE_INITIALIZING){ 847 if (hci_stack.substate % 2){ 848 // odd: waiting for event 849 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE || packet[0] == HCI_EVENT_COMMAND_STATUS){ 850 // wait for explicit COMMAND COMPLETE on RESET 851 if (hci_stack.substate > 1 || COMMAND_COMPLETE_EVENT(packet, hci_reset)) { 852 hci_stack.substate++; 853 } 854 } 855 } 856 } 857 858 // help with BT sleep 859 if (hci_stack.state == HCI_STATE_FALLING_ASLEEP 860 && hci_stack.substate == 1 861 && COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){ 862 hci_stack.substate++; 863 } 864 865 hci_stack.packet_handler(HCI_EVENT_PACKET, packet, size); 866 867 // execute main loop 868 hci_run(); 869 } 870 871 static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 872 switch (packet_type) { 873 case HCI_EVENT_PACKET: 874 event_handler(packet, size); 875 break; 876 case HCI_ACL_DATA_PACKET: 877 acl_handler(packet, size); 878 break; 879 default: 880 break; 881 } 882 } 883 884 /** Register HCI packet handlers */ 885 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 886 hci_stack.packet_handler = handler; 887 } 888 889 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t const* remote_device_db){ 890 891 // reference to use transport layer implementation 892 hci_stack.hci_transport = transport; 893 894 // references to used control implementation 895 hci_stack.control = control; 896 897 // reference to used config 898 hci_stack.config = config; 899 900 // no connections yet 901 hci_stack.connections = NULL; 902 hci_stack.discoverable = 0; 903 hci_stack.connectable = 0; 904 hci_stack.bondable = 1; 905 906 // no pending cmds 907 hci_stack.decline_reason = 0; 908 hci_stack.new_scan_enable_value = 0xff; 909 910 // higher level handler 911 hci_stack.packet_handler = dummy_handler; 912 913 // store and open remote device db 914 hci_stack.remote_device_db = remote_device_db; 915 if (hci_stack.remote_device_db) { 916 hci_stack.remote_device_db->open(); 917 } 918 919 // max acl payload size defined in config.h 920 hci_stack.acl_data_packet_length = HCI_ACL_PAYLOAD_SIZE; 921 922 // register packet handlers with transport 923 transport->register_packet_handler(&packet_handler); 924 925 hci_stack.state = HCI_STATE_OFF; 926 927 // class of device 928 hci_stack.class_of_device = 0x007a020c; // Smartphone 929 930 // Secure Simple Pairing default: enable, no I/O capabilities, general bonding, mitm not required, auto accept 931 hci_stack.ssp_enable = 1; 932 hci_stack.ssp_io_capability = SSP_IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 933 hci_stack.ssp_authentication_requirement = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_GENERAL_BONDING; 934 hci_stack.ssp_auto_accept = 1; 935 936 // LE 937 hci_stack.adv_addr_type = 0; 938 memset(hci_stack.adv_address, 0, 6); 939 } 940 941 void hci_close(){ 942 // close remote device db 943 if (hci_stack.remote_device_db) { 944 hci_stack.remote_device_db->close(); 945 } 946 while (hci_stack.connections) { 947 hci_shutdown_connection((hci_connection_t *) hci_stack.connections); 948 } 949 hci_power_control(HCI_POWER_OFF); 950 } 951 952 // State-Module-Driver overview 953 // state module low-level 954 // HCI_STATE_OFF off close 955 // HCI_STATE_INITIALIZING, on open 956 // HCI_STATE_WORKING, on open 957 // HCI_STATE_HALTING, on open 958 // HCI_STATE_SLEEPING, off/sleep close 959 // HCI_STATE_FALLING_ASLEEP on open 960 961 static int hci_power_control_on(void){ 962 963 // power on 964 int err = 0; 965 if (hci_stack.control && hci_stack.control->on){ 966 err = (*hci_stack.control->on)(hci_stack.config); 967 } 968 if (err){ 969 log_error( "POWER_ON failed\n"); 970 hci_emit_hci_open_failed(); 971 return err; 972 } 973 974 // open low-level device 975 err = hci_stack.hci_transport->open(hci_stack.config); 976 if (err){ 977 log_error( "HCI_INIT failed, turning Bluetooth off again\n"); 978 if (hci_stack.control && hci_stack.control->off){ 979 (*hci_stack.control->off)(hci_stack.config); 980 } 981 hci_emit_hci_open_failed(); 982 return err; 983 } 984 return 0; 985 } 986 987 static void hci_power_control_off(void){ 988 989 log_info("hci_power_control_off\n"); 990 991 // close low-level device 992 hci_stack.hci_transport->close(hci_stack.config); 993 994 log_info("hci_power_control_off - hci_transport closed\n"); 995 996 // power off 997 if (hci_stack.control && hci_stack.control->off){ 998 (*hci_stack.control->off)(hci_stack.config); 999 } 1000 1001 log_info("hci_power_control_off - control closed\n"); 1002 1003 hci_stack.state = HCI_STATE_OFF; 1004 } 1005 1006 static void hci_power_control_sleep(void){ 1007 1008 log_info("hci_power_control_sleep\n"); 1009 1010 #if 0 1011 // don't close serial port during sleep 1012 1013 // close low-level device 1014 hci_stack.hci_transport->close(hci_stack.config); 1015 #endif 1016 1017 // sleep mode 1018 if (hci_stack.control && hci_stack.control->sleep){ 1019 (*hci_stack.control->sleep)(hci_stack.config); 1020 } 1021 1022 hci_stack.state = HCI_STATE_SLEEPING; 1023 } 1024 1025 static int hci_power_control_wake(void){ 1026 1027 log_info("hci_power_control_wake\n"); 1028 1029 // wake on 1030 if (hci_stack.control && hci_stack.control->wake){ 1031 (*hci_stack.control->wake)(hci_stack.config); 1032 } 1033 1034 #if 0 1035 // open low-level device 1036 int err = hci_stack.hci_transport->open(hci_stack.config); 1037 if (err){ 1038 log_error( "HCI_INIT failed, turning Bluetooth off again\n"); 1039 if (hci_stack.control && hci_stack.control->off){ 1040 (*hci_stack.control->off)(hci_stack.config); 1041 } 1042 hci_emit_hci_open_failed(); 1043 return err; 1044 } 1045 #endif 1046 1047 return 0; 1048 } 1049 1050 1051 int hci_power_control(HCI_POWER_MODE power_mode){ 1052 1053 log_info("hci_power_control: %u, current mode %u\n", power_mode, hci_stack.state); 1054 1055 int err = 0; 1056 switch (hci_stack.state){ 1057 1058 case HCI_STATE_OFF: 1059 switch (power_mode){ 1060 case HCI_POWER_ON: 1061 err = hci_power_control_on(); 1062 if (err) return err; 1063 // set up state machine 1064 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 1065 hci_stack.state = HCI_STATE_INITIALIZING; 1066 hci_stack.substate = 0; 1067 break; 1068 case HCI_POWER_OFF: 1069 // do nothing 1070 break; 1071 case HCI_POWER_SLEEP: 1072 // do nothing (with SLEEP == OFF) 1073 break; 1074 } 1075 break; 1076 1077 case HCI_STATE_INITIALIZING: 1078 switch (power_mode){ 1079 case HCI_POWER_ON: 1080 // do nothing 1081 break; 1082 case HCI_POWER_OFF: 1083 // no connections yet, just turn it off 1084 hci_power_control_off(); 1085 break; 1086 case HCI_POWER_SLEEP: 1087 // no connections yet, just turn it off 1088 hci_power_control_sleep(); 1089 break; 1090 } 1091 break; 1092 1093 case HCI_STATE_WORKING: 1094 switch (power_mode){ 1095 case HCI_POWER_ON: 1096 // do nothing 1097 break; 1098 case HCI_POWER_OFF: 1099 // see hci_run 1100 hci_stack.state = HCI_STATE_HALTING; 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_HALTING: 1111 switch (power_mode){ 1112 case HCI_POWER_ON: 1113 // set up state machine 1114 hci_stack.state = HCI_STATE_INITIALIZING; 1115 hci_stack.substate = 0; 1116 break; 1117 case HCI_POWER_OFF: 1118 // do nothing 1119 break; 1120 case HCI_POWER_SLEEP: 1121 // see hci_run 1122 hci_stack.state = HCI_STATE_FALLING_ASLEEP; 1123 hci_stack.substate = 0; 1124 break; 1125 } 1126 break; 1127 1128 case HCI_STATE_FALLING_ASLEEP: 1129 switch (power_mode){ 1130 case HCI_POWER_ON: 1131 1132 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1133 // nothing to do, if H4 supports power management 1134 if (bt_control_iphone_power_management_enabled()){ 1135 hci_stack.state = HCI_STATE_INITIALIZING; 1136 hci_stack.substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1137 break; 1138 } 1139 #endif 1140 // set up state machine 1141 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 1142 hci_stack.state = HCI_STATE_INITIALIZING; 1143 hci_stack.substate = 0; 1144 break; 1145 case HCI_POWER_OFF: 1146 // see hci_run 1147 hci_stack.state = HCI_STATE_HALTING; 1148 break; 1149 case HCI_POWER_SLEEP: 1150 // do nothing 1151 break; 1152 } 1153 break; 1154 1155 case HCI_STATE_SLEEPING: 1156 switch (power_mode){ 1157 case HCI_POWER_ON: 1158 1159 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1160 // nothing to do, if H4 supports power management 1161 if (bt_control_iphone_power_management_enabled()){ 1162 hci_stack.state = HCI_STATE_INITIALIZING; 1163 hci_stack.substate = HCI_INTIALIZING_SUBSTATE_AFTER_SLEEP; 1164 hci_update_scan_enable(); 1165 break; 1166 } 1167 #endif 1168 err = hci_power_control_wake(); 1169 if (err) return err; 1170 // set up state machine 1171 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 1172 hci_stack.state = HCI_STATE_INITIALIZING; 1173 hci_stack.substate = 0; 1174 break; 1175 case HCI_POWER_OFF: 1176 hci_stack.state = HCI_STATE_HALTING; 1177 break; 1178 case HCI_POWER_SLEEP: 1179 // do nothing 1180 break; 1181 } 1182 break; 1183 } 1184 1185 // create internal event 1186 hci_emit_state(); 1187 1188 // trigger next/first action 1189 hci_run(); 1190 1191 return 0; 1192 } 1193 1194 static void hci_update_scan_enable(void){ 1195 // 2 = page scan, 1 = inq scan 1196 hci_stack.new_scan_enable_value = hci_stack.connectable << 1 | hci_stack.discoverable; 1197 hci_run(); 1198 } 1199 1200 void hci_discoverable_control(uint8_t enable){ 1201 if (enable) enable = 1; // normalize argument 1202 1203 if (hci_stack.discoverable == enable){ 1204 hci_emit_discoverable_enabled(hci_stack.discoverable); 1205 return; 1206 } 1207 1208 hci_stack.discoverable = enable; 1209 hci_update_scan_enable(); 1210 } 1211 1212 void hci_connectable_control(uint8_t enable){ 1213 if (enable) enable = 1; // normalize argument 1214 1215 // don't emit event 1216 if (hci_stack.connectable == enable) return; 1217 1218 hci_stack.connectable = enable; 1219 hci_update_scan_enable(); 1220 } 1221 1222 bd_addr_t * hci_local_bd_addr(void){ 1223 return &hci_stack.local_bd_addr; 1224 } 1225 1226 void hci_run(){ 1227 1228 hci_connection_t * connection; 1229 linked_item_t * it; 1230 1231 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1232 1233 // global/non-connection oriented commands 1234 1235 // decline incoming connections 1236 if (hci_stack.decline_reason){ 1237 uint8_t reason = hci_stack.decline_reason; 1238 hci_stack.decline_reason = 0; 1239 hci_send_cmd(&hci_reject_connection_request, hci_stack.decline_addr, reason); 1240 return; 1241 } 1242 1243 // send scan enable 1244 if (hci_stack.state == HCI_STATE_WORKING && hci_stack.new_scan_enable_value != 0xff && hci_classic_supported()){ 1245 hci_send_cmd(&hci_write_scan_enable, hci_stack.new_scan_enable_value); 1246 hci_stack.new_scan_enable_value = 0xff; 1247 return; 1248 } 1249 1250 // send pending HCI commands 1251 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 1252 1253 connection = (hci_connection_t *) it; 1254 1255 if (connection->state == SEND_CREATE_CONNECTION){ 1256 log_info("sending hci_create_connection\n"); 1257 hci_send_cmd(&hci_create_connection, connection->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 1258 return; 1259 } 1260 1261 if (connection->state == RECEIVED_CONNECTION_REQUEST){ 1262 log_info("sending hci_accept_connection_request\n"); 1263 connection->state = ACCEPTED_CONNECTION_REQUEST; 1264 hci_send_cmd(&hci_accept_connection_request, connection->address, 1); 1265 return; 1266 } 1267 1268 if (connection->authentication_flags & HANDLE_LINK_KEY_REQUEST){ 1269 log_info("responding to link key request\n"); 1270 connectionClearAuthenticationFlags(connection, HANDLE_LINK_KEY_REQUEST); 1271 link_key_t link_key; 1272 link_key_type_t link_key_type; 1273 if ( hci_stack.remote_device_db 1274 && hci_stack.remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type) 1275 && gap_security_level_for_link_key_type(link_key_type) >= connection->requested_security_level){ 1276 connection->link_key_type = link_key_type; 1277 hci_send_cmd(&hci_link_key_request_reply, connection->address, &link_key); 1278 } else { 1279 hci_send_cmd(&hci_link_key_request_negative_reply, connection->address); 1280 } 1281 return; 1282 } 1283 1284 if (connection->authentication_flags & DENY_PIN_CODE_REQUEST){ 1285 log_info("denying to pin request\n"); 1286 connectionClearAuthenticationFlags(connection, DENY_PIN_CODE_REQUEST); 1287 hci_send_cmd(&hci_pin_code_request_negative_reply, connection->address); 1288 return; 1289 } 1290 1291 if (connection->authentication_flags & SEND_IO_CAPABILITIES_REPLY){ 1292 connectionClearAuthenticationFlags(connection, SEND_IO_CAPABILITIES_REPLY); 1293 if (hci_stack.bondable && hci_stack.ssp_io_capability != SSP_IO_CAPABILITY_UNKNOWN){ 1294 // tweak authentication requirements 1295 uint8_t authreq = hci_stack.ssp_authentication_requirement; 1296 if (connection->bonding_flags & BONDING_DEDICATED){ 1297 authreq = SSP_IO_AUTHREQ_MITM_PROTECTION_NOT_REQUIRED_DEDICATED_BONDING; 1298 } 1299 if (gap_mitm_protection_required_for_security_level(connection->requested_security_level)){ 1300 authreq |= 1; 1301 } 1302 hci_send_cmd(&hci_io_capability_request_reply, &connection->address, hci_stack.ssp_io_capability, NULL, authreq); 1303 } else { 1304 hci_send_cmd(&hci_io_capability_request_negative_reply, &connection->address, ERROR_CODE_PAIRING_NOT_ALLOWED); 1305 } 1306 return; 1307 } 1308 1309 if (connection->authentication_flags & SEND_USER_CONFIRM_REPLY){ 1310 connectionClearAuthenticationFlags(connection, SEND_USER_CONFIRM_REPLY); 1311 hci_send_cmd(&hci_user_confirmation_request_reply, &connection->address); 1312 return; 1313 } 1314 1315 if (connection->authentication_flags & SEND_USER_PASSKEY_REPLY){ 1316 connectionClearAuthenticationFlags(connection, SEND_USER_PASSKEY_REPLY); 1317 hci_send_cmd(&hci_user_passkey_request_reply, &connection->address, 000000); 1318 return; 1319 } 1320 1321 if (connection->bonding_flags & BONDING_REQUEST_REMOTE_FEATURES){ 1322 connection->bonding_flags &= ~BONDING_REQUEST_REMOTE_FEATURES; 1323 hci_send_cmd(&hci_read_remote_supported_features_command, connection->con_handle); 1324 return; 1325 } 1326 1327 if (connection->bonding_flags & BONDING_DISCONNECT_SECURITY_BLOCK){ 1328 connection->bonding_flags &= ~BONDING_DISCONNECT_SECURITY_BLOCK; 1329 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x0005); // authentication failure 1330 return; 1331 } 1332 if (connection->bonding_flags & BONDING_DISCONNECT_DEDICATED_DONE){ 1333 connection->bonding_flags &= ~BONDING_DISCONNECT_DEDICATED_DONE; 1334 hci_send_cmd(&hci_disconnect, connection->con_handle, 0); // authentication done 1335 return; 1336 } 1337 if (connection->bonding_flags & BONDING_SEND_AUTHENTICATE_REQUEST){ 1338 connection->bonding_flags &= ~BONDING_SEND_AUTHENTICATE_REQUEST; 1339 hci_send_cmd(&hci_authentication_requested, connection->con_handle); 1340 return; 1341 } 1342 if (connection->bonding_flags & BONDING_SEND_ENCRYPTION_REQUEST){ 1343 connection->bonding_flags &= ~BONDING_SEND_ENCRYPTION_REQUEST; 1344 hci_send_cmd(&hci_set_connection_encryption, connection->con_handle, 1); 1345 return; 1346 } 1347 } 1348 1349 switch (hci_stack.state){ 1350 case HCI_STATE_INITIALIZING: 1351 // log_info("hci_init: substate %u\n", hci_stack.substate); 1352 if (hci_stack.substate % 2) { 1353 // odd: waiting for command completion 1354 return; 1355 } 1356 switch (hci_stack.substate >> 1){ 1357 case 0: // RESET 1358 hci_send_cmd(&hci_reset); 1359 1360 if (hci_stack.config == 0 || ((hci_uart_config_t *)hci_stack.config)->baudrate_main == 0){ 1361 // skip baud change 1362 hci_stack.substate = 4; // >> 1 = 2 1363 } 1364 break; 1365 case 1: // SEND BAUD CHANGE 1366 hci_stack.control->baudrate_cmd(hci_stack.config, ((hci_uart_config_t *)hci_stack.config)->baudrate_main, hci_stack.hci_packet_buffer); 1367 hci_send_cmd_packet(hci_stack.hci_packet_buffer, 3 + hci_stack.hci_packet_buffer[2]); 1368 break; 1369 case 2: // LOCAL BAUD CHANGE 1370 hci_stack.hci_transport->set_baudrate(((hci_uart_config_t *)hci_stack.config)->baudrate_main); 1371 hci_stack.substate += 2; 1372 // break missing here for fall through 1373 1374 case 3: 1375 // Custom initialization 1376 if (hci_stack.control && hci_stack.control->next_cmd){ 1377 int valid_cmd = (*hci_stack.control->next_cmd)(hci_stack.config, hci_stack.hci_packet_buffer); 1378 if (valid_cmd){ 1379 int size = 3 + hci_stack.hci_packet_buffer[2]; 1380 hci_stack.hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, hci_stack.hci_packet_buffer, size); 1381 hci_stack.substate = 4; // more init commands 1382 break; 1383 } 1384 log_info("hci_run: init script done\n\r"); 1385 } 1386 // otherwise continue 1387 hci_send_cmd(&hci_read_bd_addr); 1388 break; 1389 case 4: 1390 hci_send_cmd(&hci_read_buffer_size); 1391 break; 1392 case 5: 1393 hci_send_cmd(&hci_read_local_supported_features); 1394 break; 1395 case 6: 1396 if (hci_le_supported()){ 1397 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x3FFFFFFF); 1398 } else { 1399 // Kensington Bluetoot 2.1 USB Dongle (CSR Chipset) returns an error for 0xffff... 1400 hci_send_cmd(&hci_set_event_mask,0xffffffff, 0x1FFFFFFF); 1401 } 1402 1403 // skip Classic init commands for LE only chipsets 1404 if (!hci_classic_supported()){ 1405 if (hci_le_supported()){ 1406 hci_stack.substate = 11 << 1; // skip all classic command 1407 } else { 1408 log_error("Neither BR/EDR nor LE supported"); 1409 hci_stack.substate = 13 << 1; // skip all 1410 } 1411 } 1412 break; 1413 case 7: 1414 if (hci_ssp_supported()){ 1415 hci_send_cmd(&hci_write_simple_pairing_mode, hci_stack.ssp_enable); 1416 break; 1417 } 1418 hci_stack.substate += 2; 1419 // break missing here for fall through 1420 1421 case 8: 1422 // ca. 15 sec 1423 hci_send_cmd(&hci_write_page_timeout, 0x6000); 1424 break; 1425 case 9: 1426 hci_send_cmd(&hci_write_class_of_device, hci_stack.class_of_device); 1427 break; 1428 case 10: 1429 if (hci_stack.local_name){ 1430 hci_send_cmd(&hci_write_local_name, hci_stack.local_name); 1431 } else { 1432 char hostname[30]; 1433 #ifdef EMBEDDED 1434 // BTstack-11:22:33:44:55:66 1435 strcpy(hostname, "BTstack "); 1436 strcat(hostname, bd_addr_to_str(hci_stack.local_bd_addr)); 1437 printf("---> Name %s\n", hostname); 1438 #else 1439 // hostname for POSIX systems 1440 gethostname(hostname, 30); 1441 hostname[29] = '\0'; 1442 #endif 1443 hci_send_cmd(&hci_write_local_name, hostname); 1444 } 1445 break; 1446 case 11: 1447 hci_send_cmd(&hci_write_scan_enable, (hci_stack.connectable << 1) | hci_stack.discoverable); // page scan 1448 if (!hci_le_supported()){ 1449 // SKIP LE init for Classic only configuration 1450 hci_stack.substate = 13 << 1; 1451 } 1452 break; 1453 1454 #ifdef HAVE_BLE 1455 // LE INIT 1456 case 12: 1457 hci_send_cmd(&hci_le_read_buffer_size); 1458 break; 1459 case 13: 1460 // LE Supported Host = 1, Simultaneous Host = 0 1461 hci_send_cmd(&hci_write_le_host_supported, 1, 0); 1462 break; 1463 #endif 1464 1465 // DONE 1466 case 14: 1467 // done. 1468 hci_stack.state = HCI_STATE_WORKING; 1469 hci_emit_state(); 1470 break; 1471 default: 1472 break; 1473 } 1474 hci_stack.substate++; 1475 break; 1476 1477 case HCI_STATE_HALTING: 1478 1479 log_info("HCI_STATE_HALTING\n"); 1480 // close all open connections 1481 connection = (hci_connection_t *) hci_stack.connections; 1482 if (connection){ 1483 1484 // send disconnect 1485 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1486 1487 log_info("HCI_STATE_HALTING, connection %p, handle %u\n", connection, (uint16_t)connection->con_handle); 1488 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1489 1490 // send disconnected event right away - causes higher layer connections to get closed, too. 1491 hci_shutdown_connection(connection); 1492 return; 1493 } 1494 log_info("HCI_STATE_HALTING, calling off\n"); 1495 1496 // switch mode 1497 hci_power_control_off(); 1498 1499 log_info("HCI_STATE_HALTING, emitting state\n"); 1500 hci_emit_state(); 1501 log_info("HCI_STATE_HALTING, done\n"); 1502 break; 1503 1504 case HCI_STATE_FALLING_ASLEEP: 1505 switch(hci_stack.substate) { 1506 case 0: 1507 log_info("HCI_STATE_FALLING_ASLEEP\n"); 1508 // close all open connections 1509 connection = (hci_connection_t *) hci_stack.connections; 1510 1511 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1512 // don't close connections, if H4 supports power management 1513 if (bt_control_iphone_power_management_enabled()){ 1514 connection = NULL; 1515 } 1516 #endif 1517 if (connection){ 1518 1519 // send disconnect 1520 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1521 1522 log_info("HCI_STATE_FALLING_ASLEEP, connection %p, handle %u\n", connection, (uint16_t)connection->con_handle); 1523 hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection 1524 1525 // send disconnected event right away - causes higher layer connections to get closed, too. 1526 hci_shutdown_connection(connection); 1527 return; 1528 } 1529 1530 if (hci_classic_supported()){ 1531 // disable page and inquiry scan 1532 if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return; 1533 1534 log_info("HCI_STATE_HALTING, disabling inq scans\n"); 1535 hci_send_cmd(&hci_write_scan_enable, hci_stack.connectable << 1); // drop inquiry scan but keep page scan 1536 1537 // continue in next sub state 1538 hci_stack.substate++; 1539 break; 1540 } 1541 // fall through for ble-only chips 1542 1543 case 2: 1544 log_info("HCI_STATE_HALTING, calling sleep\n"); 1545 #if defined(USE_POWERMANAGEMENT) && defined(USE_BLUETOOL) 1546 // don't actually go to sleep, if H4 supports power management 1547 if (bt_control_iphone_power_management_enabled()){ 1548 // SLEEP MODE reached 1549 hci_stack.state = HCI_STATE_SLEEPING; 1550 hci_emit_state(); 1551 break; 1552 } 1553 #endif 1554 // switch mode 1555 hci_power_control_sleep(); // changes hci_stack.state to SLEEP 1556 hci_emit_state(); 1557 break; 1558 1559 default: 1560 break; 1561 } 1562 break; 1563 1564 default: 1565 break; 1566 } 1567 } 1568 1569 int hci_send_cmd_packet(uint8_t *packet, int size){ 1570 bd_addr_t addr; 1571 hci_connection_t * conn; 1572 // house-keeping 1573 1574 // create_connection? 1575 if (IS_COMMAND(packet, hci_create_connection)){ 1576 bt_flip_addr(addr, &packet[3]); 1577 log_info("Create_connection to %s\n", bd_addr_to_str(addr)); 1578 1579 conn = connection_for_address(addr); 1580 if (!conn){ 1581 conn = create_connection_for_addr(addr); 1582 if (!conn){ 1583 // notify client that alloc failed 1584 hci_emit_connection_complete(conn, BTSTACK_MEMORY_ALLOC_FAILED); 1585 return 0; // don't sent packet to controller 1586 } 1587 conn->state = SEND_CREATE_CONNECTION; 1588 } 1589 log_info("conn state %u", conn->state); 1590 switch (conn->state){ 1591 // if connection active exists 1592 case OPEN: 1593 // and OPEN, emit connection complete command 1594 hci_emit_connection_complete(conn, 0); 1595 break; 1596 case SEND_CREATE_CONNECTION: 1597 // connection created by hci, e.g. dedicated bonding 1598 break; 1599 default: 1600 // otherwise, just ignore as it is already in the open process 1601 return 0; 1602 } 1603 conn->state = SENT_CREATE_CONNECTION; 1604 } 1605 1606 if (IS_COMMAND(packet, hci_link_key_request_reply)){ 1607 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY); 1608 } 1609 if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){ 1610 hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST); 1611 } 1612 1613 if (IS_COMMAND(packet, hci_delete_stored_link_key)){ 1614 if (hci_stack.remote_device_db){ 1615 bt_flip_addr(addr, &packet[3]); 1616 hci_stack.remote_device_db->delete_link_key(&addr); 1617 } 1618 } 1619 1620 if (IS_COMMAND(packet, hci_pin_code_request_negative_reply) 1621 || IS_COMMAND(packet, hci_pin_code_request_reply)){ 1622 bt_flip_addr(addr, &packet[3]); 1623 conn = connection_for_address(addr); 1624 if (conn){ 1625 connectionClearAuthenticationFlags(conn, LEGACY_PAIRING_ACTIVE); 1626 } 1627 } 1628 1629 if (IS_COMMAND(packet, hci_user_confirmation_request_negative_reply) 1630 || IS_COMMAND(packet, hci_user_confirmation_request_reply) 1631 || IS_COMMAND(packet, hci_user_passkey_request_negative_reply) 1632 || IS_COMMAND(packet, hci_user_passkey_request_reply)) { 1633 bt_flip_addr(addr, &packet[3]); 1634 conn = connection_for_address(addr); 1635 if (conn){ 1636 connectionClearAuthenticationFlags(conn, SSP_PAIRING_ACTIVE); 1637 } 1638 } 1639 1640 #ifdef HAVE_BLE 1641 if (IS_COMMAND(packet, hci_le_set_advertising_parameters)){ 1642 hci_stack.adv_addr_type = packet[8]; 1643 } 1644 if (IS_COMMAND(packet, hci_le_set_random_address)){ 1645 bt_flip_addr(hci_stack.adv_address, &packet[3]); 1646 } 1647 #endif 1648 1649 1650 hci_stack.num_cmd_packets--; 1651 return hci_stack.hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size); 1652 } 1653 1654 // disconnect because of security block 1655 void hci_disconnect_security_block(hci_con_handle_t con_handle){ 1656 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1657 if (!connection) return; 1658 connection->bonding_flags |= BONDING_DISCONNECT_SECURITY_BLOCK; 1659 } 1660 1661 1662 // Configure Secure Simple Pairing 1663 1664 // enable will enable SSP during init 1665 void hci_ssp_set_enable(int enable){ 1666 hci_stack.ssp_enable = enable; 1667 } 1668 1669 int hci_local_ssp_activated(){ 1670 return hci_ssp_supported() && hci_stack.ssp_enable; 1671 } 1672 1673 // if set, BTstack will respond to io capability request using authentication requirement 1674 void hci_ssp_set_io_capability(int io_capability){ 1675 hci_stack.ssp_io_capability = io_capability; 1676 } 1677 void hci_ssp_set_authentication_requirement(int authentication_requirement){ 1678 hci_stack.ssp_authentication_requirement = authentication_requirement; 1679 } 1680 1681 // if set, BTstack will confirm a numberic comparion and enter '000000' if requested 1682 void hci_ssp_set_auto_accept(int auto_accept){ 1683 hci_stack.ssp_auto_accept = auto_accept; 1684 } 1685 1686 /** 1687 * pre: numcmds >= 0 - it's allowed to send a command to the controller 1688 */ 1689 int hci_send_cmd(const hci_cmd_t *cmd, ...){ 1690 va_list argptr; 1691 va_start(argptr, cmd); 1692 uint16_t size = hci_create_cmd_internal(hci_stack.hci_packet_buffer, cmd, argptr); 1693 va_end(argptr); 1694 return hci_send_cmd_packet(hci_stack.hci_packet_buffer, size); 1695 } 1696 1697 // Create various non-HCI events. 1698 // TODO: generalize, use table similar to hci_create_command 1699 1700 void hci_emit_state(){ 1701 log_info("BTSTACK_EVENT_STATE %u", hci_stack.state); 1702 uint8_t event[3]; 1703 event[0] = BTSTACK_EVENT_STATE; 1704 event[1] = sizeof(event) - 2; 1705 event[2] = hci_stack.state; 1706 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1707 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1708 } 1709 1710 void hci_emit_connection_complete(hci_connection_t *conn, uint8_t status){ 1711 uint8_t event[13]; 1712 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 1713 event[1] = sizeof(event) - 2; 1714 event[2] = status; 1715 bt_store_16(event, 3, conn->con_handle); 1716 bt_flip_addr(&event[5], conn->address); 1717 event[11] = 1; // ACL connection 1718 event[12] = 0; // encryption disabled 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_disconnection_complete(uint16_t handle, uint8_t reason){ 1724 uint8_t event[6]; 1725 event[0] = HCI_EVENT_DISCONNECTION_COMPLETE; 1726 event[1] = sizeof(event) - 2; 1727 event[2] = 0; // status = OK 1728 bt_store_16(event, 3, handle); 1729 event[5] = reason; 1730 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1731 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1732 } 1733 1734 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 1735 log_info("L2CAP_EVENT_TIMEOUT_CHECK"); 1736 uint8_t event[4]; 1737 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 1738 event[1] = sizeof(event) - 2; 1739 bt_store_16(event, 2, conn->con_handle); 1740 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1741 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1742 } 1743 1744 void hci_emit_nr_connections_changed(){ 1745 log_info("BTSTACK_EVENT_NR_CONNECTIONS_CHANGED %u", nr_hci_connections()); 1746 uint8_t event[3]; 1747 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 1748 event[1] = sizeof(event) - 2; 1749 event[2] = nr_hci_connections(); 1750 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1751 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1752 } 1753 1754 void hci_emit_hci_open_failed(){ 1755 log_info("BTSTACK_EVENT_POWERON_FAILED"); 1756 uint8_t event[2]; 1757 event[0] = BTSTACK_EVENT_POWERON_FAILED; 1758 event[1] = sizeof(event) - 2; 1759 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1760 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1761 } 1762 1763 #ifndef EMBEDDED 1764 void hci_emit_btstack_version() { 1765 log_info("BTSTACK_EVENT_VERSION %u.%u", BTSTACK_MAJOR, BTSTACK_MINOR); 1766 uint8_t event[6]; 1767 event[0] = BTSTACK_EVENT_VERSION; 1768 event[1] = sizeof(event) - 2; 1769 event[2] = BTSTACK_MAJOR; 1770 event[3] = BTSTACK_MINOR; 1771 bt_store_16(event, 4, BTSTACK_REVISION); 1772 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1773 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1774 } 1775 #endif 1776 1777 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 1778 log_info("BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED %u", enabled); 1779 uint8_t event[3]; 1780 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 1781 event[1] = sizeof(event) - 2; 1782 event[2] = enabled; 1783 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1784 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1785 } 1786 1787 void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){ 1788 uint8_t event[2+1+6+248+1]; // +1 for \0 in log_info 1789 event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED; 1790 event[1] = sizeof(event) - 2 - 1; 1791 event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE 1792 bt_flip_addr(&event[3], *addr); 1793 memcpy(&event[9], name, 248); 1794 1795 event[9+248] = 0; // assert \0 for log_info 1796 log_info("BTSTACK_EVENT_REMOTE_NAME_CACHED %s = '%s'", bd_addr_to_str(*addr), &event[9]); 1797 1798 hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event)-1); 1799 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)-1); 1800 } 1801 1802 void hci_emit_discoverable_enabled(uint8_t enabled){ 1803 log_info("BTSTACK_EVENT_DISCOVERABLE_ENABLED %u", enabled); 1804 uint8_t event[3]; 1805 event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED; 1806 event[1] = sizeof(event) - 2; 1807 event[2] = enabled; 1808 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1809 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1810 } 1811 1812 void hci_emit_security_level(hci_con_handle_t con_handle, gap_security_level_t level){ 1813 log_info("hci_emit_security_level %u for handle %x", level, con_handle); 1814 uint8_t event[5]; 1815 int pos = 0; 1816 event[pos++] = GAP_SECURITY_LEVEL; 1817 event[pos++] = sizeof(event) - 2; 1818 bt_store_16(event, 2, con_handle); 1819 pos += 2; 1820 event[pos++] = level; 1821 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1822 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1823 } 1824 1825 void hci_emit_dedicated_bonding_result(hci_connection_t * connection, uint8_t status){ 1826 log_info("hci_emit_dedicated_bonding_result %u ", status); 1827 uint8_t event[9]; 1828 int pos = 0; 1829 event[pos++] = GAP_DEDICATED_BONDING_COMPLETED; 1830 event[pos++] = sizeof(event) - 2; 1831 event[pos++] = status; 1832 bt_flip_addr( * (bd_addr_t *) &event[pos], connection->address); 1833 pos += 6; 1834 hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1835 hci_stack.packet_handler(HCI_EVENT_PACKET, event, sizeof(event)); 1836 } 1837 1838 // query if remote side supports SSP 1839 int hci_remote_ssp_supported(hci_con_handle_t con_handle){ 1840 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1841 if (!connection) return 0; 1842 return (connection->bonding_flags & BONDING_REMOTE_SUPPORTS_SSP) ? 1 : 0; 1843 } 1844 1845 int hci_ssp_supported_on_both_sides(hci_con_handle_t handle){ 1846 return hci_local_ssp_activated() && hci_remote_ssp_supported(handle); 1847 } 1848 1849 // GAP API 1850 /** 1851 * @bbrief enable/disable bonding. default is enabled 1852 * @praram enabled 1853 */ 1854 void gap_set_bondable_mode(int enable){ 1855 hci_stack.bondable = enable ? 1 : 0; 1856 } 1857 1858 /** 1859 * @brief map link keys to security levels 1860 */ 1861 gap_security_level_t gap_security_level_for_link_key_type(link_key_type_t link_key_type){ 1862 switch (link_key_type){ 1863 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256: 1864 return LEVEL_4; 1865 case COMBINATION_KEY: 1866 case AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P192: 1867 return LEVEL_3; 1868 default: 1869 return LEVEL_2; 1870 } 1871 } 1872 1873 static gap_security_level_t gap_security_level_for_connection(hci_connection_t * connection){ 1874 if (!connection) return LEVEL_0; 1875 if ((connection->authentication_flags & CONNECTION_ENCRYPTED) == 0) return LEVEL_0; 1876 return gap_security_level_for_link_key_type(connection->link_key_type); 1877 } 1878 1879 1880 int gap_mitm_protection_required_for_security_level(gap_security_level_t level){ 1881 return level > LEVEL_2; 1882 } 1883 1884 /** 1885 * @brief get current security level 1886 */ 1887 gap_security_level_t gap_security_level(hci_con_handle_t con_handle){ 1888 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1889 if (!connection) return LEVEL_0; 1890 return gap_security_level_for_connection(connection); 1891 } 1892 1893 /** 1894 * @brief request connection to device to 1895 * @result GAP_AUTHENTICATION_RESULT 1896 */ 1897 void gap_request_security_level(hci_con_handle_t con_handle, gap_security_level_t requested_level){ 1898 hci_connection_t * connection = hci_connection_for_handle(con_handle); 1899 if (!connection){ 1900 hci_emit_security_level(con_handle, LEVEL_0); 1901 return; 1902 } 1903 gap_security_level_t current_level = gap_security_level(con_handle); 1904 log_info("gap_request_security_level %u, current level %u", requested_level, current_level); 1905 if (current_level >= requested_level){ 1906 hci_emit_security_level(con_handle, current_level); 1907 return; 1908 } 1909 1910 connection->requested_security_level = requested_level; 1911 1912 // would enabling ecnryption suffice (>= LEVEL_2)? 1913 if (hci_stack.remote_device_db){ 1914 link_key_type_t link_key_type; 1915 link_key_t link_key; 1916 if (hci_stack.remote_device_db->get_link_key( &connection->address, &link_key, &link_key_type)){ 1917 if (gap_security_level_for_link_key_type(link_key_type) >= requested_level){ 1918 connection->bonding_flags |= BONDING_SEND_ENCRYPTION_REQUEST; 1919 return; 1920 } 1921 } 1922 } 1923 1924 // try to authenticate connection 1925 connection->bonding_flags |= BONDING_SEND_AUTHENTICATE_REQUEST; 1926 } 1927 1928 /** 1929 * @brief start dedicated bonding with device. disconnect after bonding 1930 * @param device 1931 * @param request MITM protection 1932 * @result GAP_DEDICATED_BONDING_COMPLETE 1933 */ 1934 int gap_dedicated_bonding(bd_addr_t device, int mitm_protection_required){ 1935 1936 1937 printf("gap_dedicated_bonding clled\n"); 1938 // create connection state machine 1939 hci_connection_t * connection = create_connection_for_addr(device); 1940 1941 if (!connection){ 1942 return BTSTACK_MEMORY_ALLOC_FAILED; 1943 } 1944 1945 printf("gap_dedicated_bonding 2\n"); 1946 1947 // delete linkn key 1948 hci_drop_link_key_for_bd_addr( (bd_addr_t *) &device); 1949 1950 // configure LEVEL_2/3, dedicated bonding 1951 connection->state = SEND_CREATE_CONNECTION; 1952 connection->requested_security_level = mitm_protection_required ? LEVEL_3 : LEVEL_2; 1953 connection->bonding_flags = BONDING_DEDICATED; 1954 1955 // wait for GAP Security Result and send GAP Dedicated Bonding complete 1956 1957 // handle: connnection failure (connection complete != ok) 1958 // handle: authentication failure 1959 // handle: disconnect on done 1960 1961 hci_run(); 1962 1963 return 0; 1964 } 1965