1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 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 BLUEKITCHEN GMBH 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 BLUEKITCHEN 24 * GMBH 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 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "att_server.c" 39 40 41 // 42 // ATT Server Globals 43 // 44 45 #include <stdint.h> 46 #include <string.h> 47 #include <inttypes.h> 48 49 #include "btstack_config.h" 50 51 #include "ble/att_dispatch.h" 52 #include "ble/att_db.h" 53 #include "ble/att_server.h" 54 #include "ble/core.h" 55 #include "ble/le_device_db.h" 56 #include "ble/sm.h" 57 #include "btstack_debug.h" 58 #include "btstack_event.h" 59 #include "btstack_memory.h" 60 #include "btstack_run_loop.h" 61 #include "gap.h" 62 #include "hci.h" 63 #include "hci_dump.h" 64 #include "l2cap.h" 65 #include "btstack_tlv.h" 66 #ifdef ENABLE_LE_SIGNED_WRITE 67 #include "ble/sm.h" 68 #include "bluetooth_psm.h" 69 70 #endif 71 72 #ifdef ENABLE_TESTING_SUPPORT 73 #include <stdio.h> 74 #endif 75 76 #ifndef NVN_NUM_GATT_SERVER_CCC 77 #define NVN_NUM_GATT_SERVER_CCC 20 78 #endif 79 80 #define ATT_SERVICE_FLAGS_DELAYED_RESPONSE (1<<0u) 81 82 static void att_run_for_context(att_server_t * att_server, att_connection_t * att_connection); 83 static att_write_callback_t att_server_write_callback_for_handle(uint16_t handle); 84 static btstack_packet_handler_t att_server_packet_handler_for_handle(uint16_t handle); 85 static void att_server_handle_can_send_now(void); 86 static void att_server_persistent_ccc_restore(att_server_t * att_server, att_connection_t * att_connection); 87 static void att_server_persistent_ccc_clear(att_server_t * att_server); 88 static void att_server_handle_att_pdu(att_server_t * att_server, att_connection_t * att_connection, uint8_t * packet, uint16_t size); 89 90 typedef enum { 91 ATT_SERVER_RUN_PHASE_1_REQUESTS = 0, 92 ATT_SERVER_RUN_PHASE_2_INDICATIONS, 93 ATT_SERVER_RUN_PHASE_3_NOTIFICATIONS, 94 } att_server_run_phase_t; 95 96 // 97 typedef struct { 98 uint32_t seq_nr; 99 uint16_t att_handle; 100 uint8_t value; 101 uint8_t device_index; 102 } persistent_ccc_entry_t; 103 104 // global 105 static btstack_packet_callback_registration_t hci_event_callback_registration; 106 static btstack_packet_callback_registration_t sm_event_callback_registration; 107 static btstack_packet_handler_t att_client_packet_handler; 108 static btstack_linked_list_t service_handlers; 109 static btstack_context_callback_registration_t att_client_waiting_for_can_send_registration; 110 111 static att_read_callback_t att_server_client_read_callback; 112 static att_write_callback_t att_server_client_write_callback; 113 114 // round robin 115 static hci_con_handle_t att_server_last_can_send_now = HCI_CON_HANDLE_INVALID; 116 117 static uint8_t att_server_flags; 118 119 #ifdef ENABLE_GATT_OVER_EATT 120 typedef struct { 121 btstack_linked_item_t item; 122 att_server_t att_server; 123 att_connection_t att_connection; 124 uint8_t * receive_buffer; 125 uint8_t * send_buffer; 126 } att_server_eatt_bearer_t; 127 static att_server_eatt_bearer_t * att_server_eatt_bearer_for_con_handle(hci_con_handle_t con_handle); 128 static btstack_linked_list_t att_server_eatt_bearer_pool; 129 static btstack_linked_list_t att_server_eatt_bearer_active; 130 #endif 131 132 #ifdef ENABLE_LE_SIGNED_WRITE 133 static bool att_server_connections_for_state(att_server_state_t state, att_server_t ** att_server_out, att_connection_t ** att_connection_out){ 134 btstack_linked_list_iterator_t it; 135 hci_connections_get_iterator(&it); 136 while(btstack_linked_list_iterator_has_next(&it)){ 137 hci_connection_t * hci_connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 138 if (hci_connection->att_server.state == state) { 139 *att_server_out = &hci_connection->att_server; 140 *att_connection_out = &hci_connection->att_connection; 141 return true; 142 } 143 } 144 145 #ifdef ENABLE_GATT_OVER_EATT 146 btstack_linked_list_iterator_init(&it, &att_server_eatt_bearer_active); 147 while(btstack_linked_list_iterator_has_next(&it)){ 148 att_server_eatt_bearer_t * eatt_bearer = (att_server_eatt_bearer_t *) btstack_linked_list_iterator_next(&it); 149 if (eatt_bearer->att_server.state == state) { 150 *att_server_out = &eatt_bearer->att_server; 151 *att_connection_out = &eatt_bearer->att_connection; 152 return true; 153 } 154 } 155 #endif 156 157 return false; 158 } 159 #endif 160 161 static void att_server_request_can_send_now(att_server_t * att_server, att_connection_t * att_connection ){ 162 switch (att_server->bearer_type){ 163 case ATT_BEARER_UNENHANCED_LE: 164 #ifdef ENABLE_GATT_OVER_CLASSIC 165 case ATT_BEARER_UNENHANCED_CLASSIC: 166 /* fall through */ 167 #endif 168 att_dispatch_server_request_can_send_now_event(att_connection->con_handle); 169 break; 170 #ifdef ENABLE_GATT_OVER_EATT 171 case ATT_BEARER_ENHANCED_LE: 172 l2cap_request_can_send_now_event(att_server->l2cap_cid); 173 break; 174 #endif 175 default: 176 btstack_unreachable(); 177 break; 178 } 179 } 180 181 static bool att_server_can_send_packet(att_server_t * att_server, att_connection_t * att_connection){ 182 switch (att_server->bearer_type) { 183 case ATT_BEARER_UNENHANCED_LE: 184 #ifdef ENABLE_GATT_OVER_CLASSIC 185 case ATT_BEARER_UNENHANCED_CLASSIC: 186 /* fall through */ 187 #endif 188 return att_dispatch_server_can_send_now(att_connection->con_handle); 189 #ifdef ENABLE_GATT_OVER_EATT 190 case ATT_BEARER_ENHANCED_LE: 191 return l2cap_can_send_packet_now(att_server->l2cap_cid); 192 #endif 193 default: 194 btstack_unreachable(); 195 break; 196 } 197 return false; 198 } 199 200 static void att_handle_value_indication_notify_client(uint8_t status, uint16_t client_handle, uint16_t attribute_handle){ 201 btstack_packet_handler_t packet_handler = att_server_packet_handler_for_handle(attribute_handle); 202 if (!packet_handler) return; 203 204 uint8_t event[7]; 205 int pos = 0; 206 event[pos++] = ATT_EVENT_HANDLE_VALUE_INDICATION_COMPLETE; 207 event[pos++] = sizeof(event) - 2u; 208 event[pos++] = status; 209 little_endian_store_16(event, pos, client_handle); 210 pos += 2; 211 little_endian_store_16(event, pos, attribute_handle); 212 (*packet_handler)(HCI_EVENT_PACKET, 0, &event[0], sizeof(event)); 213 } 214 215 static void att_emit_event_to_all(const uint8_t * event, uint16_t size){ 216 // dispatch to app level handler 217 if (att_client_packet_handler != NULL){ 218 (*att_client_packet_handler)(HCI_EVENT_PACKET, 0, (uint8_t*) event, size); 219 } 220 221 // dispatch to service handlers 222 btstack_linked_list_iterator_t it; 223 btstack_linked_list_iterator_init(&it, &service_handlers); 224 while (btstack_linked_list_iterator_has_next(&it)){ 225 att_service_handler_t * handler = (att_service_handler_t*) btstack_linked_list_iterator_next(&it); 226 if (!handler->packet_handler) continue; 227 (*handler->packet_handler)(HCI_EVENT_PACKET, 0, (uint8_t*) event, size); 228 } 229 } 230 231 static void att_emit_mtu_event(hci_con_handle_t con_handle, uint16_t mtu){ 232 uint8_t event[6]; 233 int pos = 0; 234 event[pos++] = ATT_EVENT_MTU_EXCHANGE_COMPLETE; 235 event[pos++] = sizeof(event) - 2u; 236 little_endian_store_16(event, pos, con_handle); 237 pos += 2; 238 little_endian_store_16(event, pos, mtu); 239 240 // also dispatch to GATT Clients 241 att_dispatch_server_mtu_exchanged(con_handle, mtu); 242 243 // dispatch to app level handler and service handlers 244 att_emit_event_to_all(&event[0], sizeof(event)); 245 } 246 247 static void att_emit_can_send_now_event(void * context){ 248 UNUSED(context); 249 if (!att_client_packet_handler) return; 250 251 uint8_t event[] = { ATT_EVENT_CAN_SEND_NOW, 0}; 252 (*att_client_packet_handler)(HCI_EVENT_PACKET, 0, &event[0], sizeof(event)); 253 } 254 255 static void att_emit_connected_event(att_server_t * att_server, att_connection_t * att_connection){ 256 uint8_t event[11]; 257 int pos = 0; 258 event[pos++] = ATT_EVENT_CONNECTED; 259 event[pos++] = sizeof(event) - 2u; 260 event[pos++] = att_server->peer_addr_type; 261 reverse_bd_addr(att_server->peer_address, &event[pos]); 262 pos += 6; 263 little_endian_store_16(event, pos, att_connection->con_handle); 264 pos += 2; 265 266 // dispatch to app level handler and service handlers 267 att_emit_event_to_all(&event[0], sizeof(event)); 268 } 269 270 271 static void att_emit_disconnected_event(uint16_t con_handle){ 272 uint8_t event[4]; 273 int pos = 0; 274 event[pos++] = ATT_EVENT_DISCONNECTED; 275 event[pos++] = sizeof(event) - 2u; 276 little_endian_store_16(event, pos, con_handle); 277 pos += 2; 278 279 // dispatch to app level handler and service handlers 280 att_emit_event_to_all(&event[0], sizeof(event)); 281 } 282 283 static void att_handle_value_indication_timeout(btstack_timer_source_t *ts){ 284 void * context = btstack_run_loop_get_timer_context(ts); 285 hci_con_handle_t con_handle = (hci_con_handle_t) (uintptr_t) context; 286 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 287 if (!hci_connection) return; 288 // @note: after a transaction timeout, no more requests shall be sent over this ATT Bearer 289 // (that's why we don't reset the value_indication_handle) 290 att_server_t * att_server = &hci_connection->att_server; 291 uint16_t att_handle = att_server->value_indication_handle; 292 att_connection_t * att_connection = &hci_connection->att_connection; 293 att_handle_value_indication_notify_client((uint8_t)ATT_HANDLE_VALUE_INDICATION_TIMEOUT, att_connection->con_handle, att_handle); 294 } 295 296 static void att_server_event_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 297 298 UNUSED(channel); // ok: there is no channel 299 UNUSED(size); // ok: handling own l2cap events 300 301 att_server_t * att_server; 302 att_connection_t * att_connection; 303 hci_con_handle_t con_handle; 304 hci_connection_t * hci_connection; 305 306 switch (packet_type) { 307 308 case HCI_EVENT_PACKET: 309 switch (hci_event_packet_get_type(packet)) { 310 case HCI_EVENT_META_GAP: 311 switch (hci_event_gap_meta_get_subevent_code(packet)) { 312 case GAP_SUBEVENT_LE_CONNECTION_COMPLETE: 313 con_handle = gap_subevent_le_connection_complete_get_connection_handle(packet); 314 hci_connection = hci_connection_for_handle(con_handle); 315 if (!hci_connection) break; 316 att_server = &hci_connection->att_server; 317 // store connection info 318 att_server->peer_addr_type = gap_subevent_le_connection_complete_get_peer_address_type(packet); 319 gap_subevent_le_connection_complete_get_peer_address(packet, att_server->peer_address); 320 att_connection = &hci_connection->att_connection; 321 att_connection->con_handle = con_handle; 322 // reset connection properties 323 att_server->state = ATT_SERVER_IDLE; 324 att_server->bearer_type = ATT_BEARER_UNENHANCED_LE; 325 att_connection->mtu = ATT_DEFAULT_MTU; 326 att_connection->max_mtu = l2cap_max_le_mtu(); 327 if (att_connection->max_mtu > ATT_REQUEST_BUFFER_SIZE){ 328 att_connection->max_mtu = ATT_REQUEST_BUFFER_SIZE; 329 } 330 att_connection->encryption_key_size = 0u; 331 att_connection->authenticated = 0u; 332 att_connection->authorized = 0u; 333 // workaround: identity resolving can already be complete, at least store result 334 att_server->ir_le_device_db_index = sm_le_device_index(con_handle); 335 att_server->ir_lookup_active = false; 336 att_server->pairing_active = false; 337 // notify all - new 338 att_emit_connected_event(att_server, att_connection); 339 break; 340 default: 341 break; 342 } 343 break; 344 345 case HCI_EVENT_LE_META: 346 switch (hci_event_le_meta_get_subevent_code(packet)) { 347 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 348 // forward LE Connection Complete event to keep backward compatibility 349 // deprecated: please register hci handler with hci_add_event_handler or handle ATT_EVENT_CONNECTED 350 att_emit_event_to_all(packet, size); 351 break; 352 default: 353 break; 354 } 355 break; 356 357 case HCI_EVENT_ENCRYPTION_CHANGE: 358 case HCI_EVENT_ENCRYPTION_CHANGE_V2: 359 case HCI_EVENT_ENCRYPTION_KEY_REFRESH_COMPLETE: 360 // check handle 361 con_handle = little_endian_read_16(packet, 3); 362 hci_connection = hci_connection_for_handle(con_handle); 363 if (!hci_connection) break; 364 if (gap_get_connection_type(con_handle) != GAP_CONNECTION_LE) break; 365 // update security params 366 att_server = &hci_connection->att_server; 367 att_connection = &hci_connection->att_connection; 368 att_connection->encryption_key_size = gap_encryption_key_size(con_handle); 369 att_connection->authenticated = gap_authenticated(con_handle) ? 1 : 0; 370 att_connection->secure_connection = gap_secure_connection(con_handle) ? 1 : 0; 371 log_info("encrypted key size %u, authenticated %u, secure connection %u", 372 att_connection->encryption_key_size, att_connection->authenticated, att_connection->secure_connection); 373 if (hci_event_packet_get_type(packet) == HCI_EVENT_ENCRYPTION_CHANGE){ 374 // restore CCC values when encrypted for LE Connections 375 if (hci_event_encryption_change_get_encryption_enabled(packet) != 0){ 376 att_server_persistent_ccc_restore(att_server, att_connection); 377 } 378 } 379 att_run_for_context(att_server, att_connection); 380 break; 381 382 case HCI_EVENT_DISCONNECTION_COMPLETE: 383 // check handle 384 con_handle = hci_event_disconnection_complete_get_connection_handle(packet); 385 hci_connection = hci_connection_for_handle(con_handle); 386 if (!hci_connection) break; 387 att_server = &hci_connection->att_server; 388 att_connection = &hci_connection->att_connection; 389 att_clear_transaction_queue(att_connection); 390 att_connection->con_handle = 0; 391 att_server->pairing_active = false; 392 att_server->state = ATT_SERVER_IDLE; 393 if (att_server->value_indication_handle != 0u){ 394 btstack_run_loop_remove_timer(&att_server->value_indication_timer); 395 uint16_t att_handle = att_server->value_indication_handle; 396 att_server->value_indication_handle = 0u; // reset error state 397 att_handle_value_indication_notify_client((uint8_t)ATT_HANDLE_VALUE_INDICATION_DISCONNECT, att_connection->con_handle, att_handle); 398 } 399 // notify all - new 400 att_emit_disconnected_event(con_handle); 401 // notify all - old 402 att_emit_event_to_all(packet, size); 403 break; 404 405 // Identity Resolving 406 case SM_EVENT_IDENTITY_RESOLVING_STARTED: 407 con_handle = sm_event_identity_resolving_started_get_handle(packet); 408 hci_connection = hci_connection_for_handle(con_handle); 409 if (!hci_connection) break; 410 att_server = &hci_connection->att_server; 411 log_info("SM_EVENT_IDENTITY_RESOLVING_STARTED"); 412 att_server->ir_lookup_active = true; 413 break; 414 case SM_EVENT_IDENTITY_RESOLVING_SUCCEEDED: 415 con_handle = sm_event_identity_created_get_handle(packet); 416 hci_connection = hci_connection_for_handle(con_handle); 417 if (!hci_connection) return; 418 att_connection = &hci_connection->att_connection; 419 att_server = &hci_connection->att_server; 420 att_server->ir_lookup_active = false; 421 att_server->ir_le_device_db_index = sm_event_identity_resolving_succeeded_get_index(packet); 422 log_info("SM_EVENT_IDENTITY_RESOLVING_SUCCEEDED"); 423 att_run_for_context(att_server, att_connection); 424 break; 425 case SM_EVENT_IDENTITY_RESOLVING_FAILED: 426 con_handle = sm_event_identity_resolving_failed_get_handle(packet); 427 hci_connection = hci_connection_for_handle(con_handle); 428 if (!hci_connection) break; 429 att_connection = &hci_connection->att_connection; 430 att_server = &hci_connection->att_server; 431 log_info("SM_EVENT_IDENTITY_RESOLVING_FAILED"); 432 att_server->ir_lookup_active = false; 433 att_server->ir_le_device_db_index = -1; 434 att_run_for_context(att_server, att_connection); 435 break; 436 437 // Pairing started - delete stored CCC values 438 // - assumes pairing indicates either new device or re-pairing, in both cases there should be no stored CCC values 439 // - assumes that all events have the con handle as the first field 440 case SM_EVENT_JUST_WORKS_REQUEST: 441 case SM_EVENT_PASSKEY_DISPLAY_NUMBER: 442 case SM_EVENT_PASSKEY_INPUT_NUMBER: 443 case SM_EVENT_NUMERIC_COMPARISON_REQUEST: 444 con_handle = sm_event_just_works_request_get_handle(packet); 445 hci_connection = hci_connection_for_handle(con_handle); 446 if (!hci_connection) break; 447 att_server = &hci_connection->att_server; 448 log_info("SM Pairing started"); 449 att_server->pairing_active = true; 450 if (att_server->ir_le_device_db_index < 0) break; 451 att_server_persistent_ccc_clear(att_server); 452 // index not valid anymore 453 att_server->ir_le_device_db_index = -1; 454 break; 455 456 // Bonding completed 457 case SM_EVENT_IDENTITY_CREATED: 458 con_handle = sm_event_identity_created_get_handle(packet); 459 hci_connection = hci_connection_for_handle(con_handle); 460 if (!hci_connection) return; 461 att_connection = &hci_connection->att_connection; 462 att_server = &hci_connection->att_server; 463 att_server->pairing_active = false; 464 att_server->ir_le_device_db_index = sm_event_identity_created_get_index(packet); 465 att_run_for_context(att_server, att_connection); 466 break; 467 468 // Pairing complete (with/without bonding=storing of pairing information) 469 case SM_EVENT_PAIRING_COMPLETE: 470 con_handle = sm_event_pairing_complete_get_handle(packet); 471 hci_connection = hci_connection_for_handle(con_handle); 472 if (!hci_connection) return; 473 att_connection = &hci_connection->att_connection; 474 att_server = &hci_connection->att_server; 475 att_server->pairing_active = false; 476 att_run_for_context(att_server, att_connection); 477 break; 478 479 // Authorization 480 case SM_EVENT_AUTHORIZATION_RESULT: { 481 con_handle = sm_event_authorization_result_get_handle(packet); 482 hci_connection = hci_connection_for_handle(con_handle); 483 if (!hci_connection) break; 484 att_connection = &hci_connection->att_connection; 485 att_server = &hci_connection->att_server; 486 att_connection->authorized = sm_event_authorization_result_get_authorization_result(packet); 487 att_server_request_can_send_now(att_server, att_connection); 488 break; 489 } 490 default: 491 break; 492 } 493 break; 494 default: 495 break; 496 } 497 } 498 499 static uint8_t 500 att_server_send_prepared(const att_server_t *att_server, const att_connection_t *att_connection, uint8_t *buffer, 501 uint16_t size) { 502 UNUSED(buffer); 503 uint8_t status = ERROR_CODE_SUCCESS; 504 switch (att_server->bearer_type) { 505 case ATT_BEARER_UNENHANCED_LE: 506 status = l2cap_send_prepared_connectionless(att_connection->con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, size); 507 break; 508 #ifdef ENABLE_GATT_OVER_CLASSIC 509 case ATT_BEARER_UNENHANCED_CLASSIC: 510 status = l2cap_send_prepared(att_server->l2cap_cid, size); 511 break; 512 #endif 513 #ifdef ENABLE_GATT_OVER_EATT 514 case ATT_BEARER_ENHANCED_LE: 515 btstack_assert(buffer != NULL); 516 status = l2cap_send(att_server->l2cap_cid, buffer, size); 517 break; 518 #endif 519 default: 520 btstack_unreachable(); 521 break; 522 } 523 return status; 524 } 525 526 #ifdef ENABLE_LE_SIGNED_WRITE 527 static void att_signed_write_handle_cmac_result(uint8_t hash[8]){ 528 att_server_t * att_server = NULL; 529 att_connection_t * att_connection = NULL; 530 bool found = att_server_connections_for_state(ATT_SERVER_W4_SIGNED_WRITE_VALIDATION, &att_server, &att_connection); 531 532 if (found == false){ 533 return; 534 } 535 536 uint8_t hash_flipped[8]; 537 reverse_64(hash, hash_flipped); 538 if (memcmp(hash_flipped, &att_server->request_buffer[att_server->request_size-8], 8) != 0){ 539 log_info("ATT Signed Write, invalid signature"); 540 #ifdef ENABLE_TESTING_SUPPORT 541 printf("ATT Signed Write, invalid signature\n"); 542 #endif 543 att_server->state = ATT_SERVER_IDLE; 544 return; 545 } 546 log_info("ATT Signed Write, valid signature"); 547 #ifdef ENABLE_TESTING_SUPPORT 548 printf("ATT Signed Write, valid signature\n"); 549 #endif 550 551 // update sequence number 552 uint32_t counter_packet = little_endian_read_32(att_server->request_buffer, att_server->request_size-12); 553 le_device_db_remote_counter_set(att_server->ir_le_device_db_index, counter_packet+1); 554 att_server->state = ATT_SERVER_REQUEST_RECEIVED_AND_VALIDATED; 555 att_server_request_can_send_now(att_server, att_connection); 556 } 557 #endif 558 559 // pre: att_server->state == ATT_SERVER_REQUEST_RECEIVED_AND_VALIDATED 560 // pre: can send now 561 // uses l2cap outgoing buffer if no eatt_buffer provided 562 // returns: 1 if packet was sent 563 static int 564 att_server_process_validated_request(att_server_t *att_server, att_connection_t *att_connection, uint8_t *eatt_buffer) { 565 566 uint8_t * att_response_buffer; 567 if (eatt_buffer != NULL){ 568 att_response_buffer = eatt_buffer; 569 } else { 570 l2cap_reserve_packet_buffer(); 571 att_response_buffer = l2cap_get_outgoing_buffer(); 572 } 573 574 uint16_t att_response_size = 0; 575 // Send Error Response for MTU Request over connection-oriented channel 576 if ((att_server->bearer_type != ATT_BEARER_UNENHANCED_LE) && (att_server->request_buffer[0] == ATT_EXCHANGE_MTU_REQUEST)){ 577 att_response_size = 5; 578 att_response_buffer[0] = ATT_ERROR_RESPONSE; 579 att_response_buffer[1] = ATT_EXCHANGE_MTU_REQUEST; 580 att_response_buffer[2] = 0; 581 att_response_buffer[3] = 0; 582 att_response_buffer[4] = ATT_ERROR_REQUEST_NOT_SUPPORTED; 583 } else { 584 att_response_size = att_handle_request(att_connection, att_server->request_buffer, att_server->request_size, att_response_buffer); 585 } 586 587 #ifdef ENABLE_ATT_DELAYED_RESPONSE 588 if ((att_response_size == ATT_READ_RESPONSE_PENDING) || (att_response_size == ATT_INTERNAL_WRITE_RESPONSE_PENDING)){ 589 // free reserved buffer 590 if (eatt_buffer == NULL){ 591 l2cap_release_packet_buffer(); 592 } 593 594 // update state 595 att_server->state = ATT_SERVER_RESPONSE_PENDING; 596 597 // callback with handle ATT_READ_RESPONSE_PENDING for reads 598 if (att_response_size == ATT_READ_RESPONSE_PENDING){ 599 // notify services that returned response pending 600 btstack_linked_list_iterator_t it; 601 btstack_linked_list_iterator_init(&it, &service_handlers); 602 while (btstack_linked_list_iterator_has_next(&it)) { 603 att_service_handler_t *handler = (att_service_handler_t *) btstack_linked_list_iterator_next(&it); 604 if ((handler->flags & ATT_SERVICE_FLAGS_DELAYED_RESPONSE) != 0){ 605 handler->flags &= ~ATT_SERVICE_FLAGS_DELAYED_RESPONSE; 606 handler->read_callback(att_connection->con_handle, ATT_READ_RESPONSE_PENDING, 0, NULL, 0); 607 } 608 } 609 // notify main read callback if it returned response pending 610 if ((att_server_flags & ATT_SERVICE_FLAGS_DELAYED_RESPONSE) != 0){ 611 // flag was set by read callback 612 btstack_assert(att_server_client_read_callback != NULL); 613 (*att_server_client_read_callback)(att_connection->con_handle, ATT_READ_RESPONSE_PENDING, 0, NULL, 0); 614 } 615 } 616 return 0; 617 } 618 #endif 619 620 // intercept "insufficient authorization" for authenticated connections to allow for user authorization 621 if ((att_response_size >= 4u) 622 && (att_response_buffer[0] == ATT_ERROR_RESPONSE) 623 && (att_response_buffer[4] == ATT_ERROR_INSUFFICIENT_AUTHORIZATION) 624 && (att_connection->authenticated != 0u)){ 625 626 switch (gap_authorization_state(att_connection->con_handle)){ 627 case AUTHORIZATION_UNKNOWN: 628 if (eatt_buffer == NULL){ 629 l2cap_release_packet_buffer(); 630 } 631 sm_request_pairing(att_connection->con_handle); 632 return 0; 633 case AUTHORIZATION_PENDING: 634 if (eatt_buffer == NULL){ 635 l2cap_release_packet_buffer(); 636 } 637 return 0; 638 default: 639 break; 640 } 641 } 642 643 att_server->state = ATT_SERVER_IDLE; 644 if (att_response_size == 0u) { 645 if (eatt_buffer == NULL){ 646 l2cap_release_packet_buffer(); 647 } 648 return 0; 649 } 650 651 (void) att_server_send_prepared(att_server, att_connection, eatt_buffer, att_response_size); 652 653 // notify client about MTU exchange result 654 if (att_response_buffer[0] == ATT_EXCHANGE_MTU_RESPONSE){ 655 att_emit_mtu_event(att_connection->con_handle, att_connection->mtu); 656 } 657 return 1; 658 } 659 660 #ifdef ENABLE_ATT_DELAYED_RESPONSE 661 uint8_t att_server_response_ready(hci_con_handle_t con_handle){ 662 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 663 if (!hci_connection) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 664 att_server_t * att_server = &hci_connection->att_server; 665 att_connection_t * att_connection = &hci_connection->att_connection; 666 if (att_server->state != ATT_SERVER_RESPONSE_PENDING) return ERROR_CODE_COMMAND_DISALLOWED; 667 668 att_server->state = ATT_SERVER_REQUEST_RECEIVED_AND_VALIDATED; 669 att_server_request_can_send_now(att_server, att_connection); 670 return ERROR_CODE_SUCCESS; 671 } 672 #endif 673 674 static void att_run_for_context(att_server_t * att_server, att_connection_t * att_connection){ 675 switch (att_server->state){ 676 case ATT_SERVER_REQUEST_RECEIVED: 677 switch (att_server->bearer_type){ 678 case ATT_BEARER_UNENHANCED_LE: 679 // wait until re-encryption as central is complete 680 if (gap_reconnect_security_setup_active(att_connection->con_handle)) { 681 return; 682 }; 683 break; 684 #if defined(ENABLE_GATT_OVER_CLASSIC) || defined (ENABLE_GATT_OVER_EATT) 685 #ifdef ENABLE_GATT_OVER_CLASSIC 686 case ATT_BEARER_UNENHANCED_CLASSIC: 687 /* fall through */ 688 #endif 689 #ifdef ENABLE_GATT_OVER_EATT 690 case ATT_BEARER_ENHANCED_LE: 691 #endif 692 // ok 693 break; 694 #endif 695 default: 696 btstack_unreachable(); 697 break; 698 } 699 700 // wait until pairing is complete 701 if (att_server->pairing_active) break; 702 703 #ifdef ENABLE_LE_SIGNED_WRITE 704 if (att_server->request_buffer[0] == ATT_SIGNED_WRITE_COMMAND){ 705 log_info("ATT Signed Write!"); 706 if (!sm_cmac_ready()) { 707 log_info("ATT Signed Write, sm_cmac engine not ready. Abort"); 708 att_server->state = ATT_SERVER_IDLE; 709 return; 710 } 711 if (att_server->request_size < (3 + 12)) { 712 log_info("ATT Signed Write, request to short. Abort."); 713 att_server->state = ATT_SERVER_IDLE; 714 return; 715 } 716 if (att_server->ir_lookup_active){ 717 return; 718 } 719 if (att_server->ir_le_device_db_index < 0){ 720 log_info("ATT Signed Write, CSRK not available"); 721 att_server->state = ATT_SERVER_IDLE; 722 return; 723 } 724 725 // check counter 726 uint32_t counter_packet = little_endian_read_32(att_server->request_buffer, att_server->request_size-12); 727 uint32_t counter_db = le_device_db_remote_counter_get(att_server->ir_le_device_db_index); 728 log_info("ATT Signed Write, DB counter %"PRIu32", packet counter %"PRIu32, counter_db, counter_packet); 729 if (counter_packet < counter_db){ 730 log_info("ATT Signed Write, db reports higher counter, abort"); 731 att_server->state = ATT_SERVER_IDLE; 732 return; 733 } 734 735 // signature is { sequence counter, secure hash } 736 sm_key_t csrk; 737 le_device_db_remote_csrk_get(att_server->ir_le_device_db_index, csrk); 738 att_server->state = ATT_SERVER_W4_SIGNED_WRITE_VALIDATION; 739 log_info("Orig Signature: "); 740 log_info_hexdump( &att_server->request_buffer[att_server->request_size-8], 8); 741 uint16_t attribute_handle = little_endian_read_16(att_server->request_buffer, 1); 742 sm_cmac_signed_write_start(csrk, att_server->request_buffer[0], attribute_handle, att_server->request_size - 15, &att_server->request_buffer[3], counter_packet, att_signed_write_handle_cmac_result); 743 return; 744 } 745 #endif 746 // move on 747 att_server->state = ATT_SERVER_REQUEST_RECEIVED_AND_VALIDATED; 748 att_server_request_can_send_now(att_server, att_connection); 749 break; 750 751 default: 752 break; 753 } 754 } 755 756 static bool att_server_data_ready_for_phase(att_server_t * att_server, att_server_run_phase_t phase){ 757 switch (phase){ 758 case ATT_SERVER_RUN_PHASE_1_REQUESTS: 759 return att_server->state == ATT_SERVER_REQUEST_RECEIVED_AND_VALIDATED; 760 case ATT_SERVER_RUN_PHASE_2_INDICATIONS: 761 return (!btstack_linked_list_empty(&att_server->indication_requests) && (att_server->value_indication_handle == 0u)); 762 case ATT_SERVER_RUN_PHASE_3_NOTIFICATIONS: 763 return (!btstack_linked_list_empty(&att_server->notification_requests)); 764 default: 765 btstack_assert(false); 766 return false; 767 } 768 } 769 770 static void att_server_trigger_send_for_phase(att_server_t * att_server, att_connection_t * att_connection, att_server_run_phase_t phase){ 771 btstack_context_callback_registration_t * client; 772 switch (phase){ 773 case ATT_SERVER_RUN_PHASE_1_REQUESTS: 774 att_server_process_validated_request(att_server, att_connection, NULL); 775 break; 776 case ATT_SERVER_RUN_PHASE_2_INDICATIONS: 777 client = (btstack_context_callback_registration_t*) att_server->indication_requests; 778 btstack_linked_list_remove(&att_server->indication_requests, (btstack_linked_item_t *) client); 779 client->callback(client->context); 780 break; 781 case ATT_SERVER_RUN_PHASE_3_NOTIFICATIONS: 782 client = (btstack_context_callback_registration_t*) att_server->notification_requests; 783 btstack_linked_list_remove(&att_server->notification_requests, (btstack_linked_item_t *) client); 784 client->callback(client->context); 785 break; 786 default: 787 btstack_assert(false); 788 break; 789 } 790 } 791 792 static void att_server_handle_can_send_now(void){ 793 794 hci_con_handle_t last_send_con_handle = HCI_CON_HANDLE_INVALID; 795 hci_connection_t * request_hci_connection = NULL; 796 bool can_send_now = true; 797 uint8_t phase_index; 798 799 for (phase_index = ATT_SERVER_RUN_PHASE_1_REQUESTS; phase_index <= ATT_SERVER_RUN_PHASE_3_NOTIFICATIONS; phase_index++){ 800 att_server_run_phase_t phase = (att_server_run_phase_t) phase_index; 801 hci_con_handle_t skip_connections_until = att_server_last_can_send_now; 802 while (true){ 803 btstack_linked_list_iterator_t it; 804 hci_connections_get_iterator(&it); 805 while(btstack_linked_list_iterator_has_next(&it)){ 806 hci_connection_t * connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 807 att_server_t * att_server = &connection->att_server; 808 att_connection_t * att_connection = &connection->att_connection; 809 810 bool data_ready = att_server_data_ready_for_phase(att_server, phase); 811 812 // log_debug("phase %u, handle 0x%04x, skip until 0x%04x, data ready %u", phase, att_connection->con_handle, skip_connections_until, data_ready); 813 814 // skip until last sender found (which is also skipped) 815 if (skip_connections_until != HCI_CON_HANDLE_INVALID){ 816 if (data_ready && (request_hci_connection == NULL)){ 817 request_hci_connection = connection; 818 } 819 if (skip_connections_until == att_connection->con_handle){ 820 skip_connections_until = HCI_CON_HANDLE_INVALID; 821 } 822 continue; 823 }; 824 825 if (data_ready){ 826 if (can_send_now){ 827 att_server_trigger_send_for_phase(att_server, att_connection, phase); 828 last_send_con_handle = att_connection->con_handle; 829 can_send_now = att_server_can_send_packet(att_server, att_connection); 830 data_ready = att_server_data_ready_for_phase(att_server, phase); 831 if (data_ready && (request_hci_connection == NULL)){ 832 request_hci_connection = connection; 833 } 834 } else { 835 request_hci_connection = connection; 836 break; 837 } 838 } 839 } 840 841 // stop skipping (handles disconnect by last send connection) 842 skip_connections_until = HCI_CON_HANDLE_INVALID; 843 844 // Exit loop, if we cannot send 845 if (!can_send_now) break; 846 847 // Exit loop, if we can send but there are also no further request 848 if (request_hci_connection == NULL) break; 849 850 // Finally, if we still can send and there are requests, just try again 851 request_hci_connection = NULL; 852 } 853 // update last send con handle for round robin 854 if (last_send_con_handle != HCI_CON_HANDLE_INVALID){ 855 att_server_last_can_send_now = last_send_con_handle; 856 } 857 } 858 859 if (request_hci_connection == NULL) return; 860 861 att_server_t * att_server = &request_hci_connection->att_server; 862 att_connection_t * att_connection = &request_hci_connection->att_connection; 863 att_server_request_can_send_now(att_server, att_connection); 864 } 865 866 static void att_server_handle_att_pdu(att_server_t * att_server, att_connection_t * att_connection, uint8_t * packet, uint16_t size){ 867 868 uint8_t opcode = packet[0u]; 869 uint8_t method = opcode & 0x03fu; 870 bool invalid = method > ATT_MULTIPLE_HANDLE_VALUE_NTF; 871 bool command = (opcode & 0x40u) != 0u; 872 873 // ignore invalid commands 874 if (invalid && command){ 875 return; 876 } 877 878 // handle value indication confirms 879 if ((opcode == ATT_HANDLE_VALUE_CONFIRMATION) && (att_server->value_indication_handle != 0u)){ 880 btstack_run_loop_remove_timer(&att_server->value_indication_timer); 881 uint16_t att_handle = att_server->value_indication_handle; 882 att_server->value_indication_handle = 0u; 883 att_handle_value_indication_notify_client(0u, att_connection->con_handle, att_handle); 884 att_server_request_can_send_now(att_server, att_connection); 885 return; 886 } 887 888 // directly process command 889 // note: signed write cannot be handled directly as authentication needs to be verified 890 if (opcode == ATT_WRITE_COMMAND){ 891 att_handle_request(att_connection, packet, size, NULL); 892 return; 893 } 894 895 // check size 896 if (size > sizeof(att_server->request_buffer)) { 897 log_info("drop att pdu 0x%02x as size %u > att_server->request_buffer %u", packet[0], size, (int) sizeof(att_server->request_buffer)); 898 return; 899 } 900 901 #ifdef ENABLE_LE_SIGNED_WRITE 902 // abort signed write validation if a new request comes in (but finish previous signed write if possible) 903 if (att_server->state == ATT_SERVER_W4_SIGNED_WRITE_VALIDATION){ 904 if (packet[0] == ATT_SIGNED_WRITE_COMMAND){ 905 log_info("skip new signed write request as previous is in validation"); 906 return; 907 } else { 908 log_info("abort signed write validation to process new request"); 909 att_server->state = ATT_SERVER_IDLE; 910 } 911 } 912 #endif 913 // last request still in processing? 914 if (att_server->state != ATT_SERVER_IDLE){ 915 log_info("skip att pdu 0x%02x as server not idle (state %u)", packet[0], att_server->state); 916 return; 917 } 918 919 // store request 920 att_server->state = ATT_SERVER_REQUEST_RECEIVED; 921 att_server->request_size = size; 922 (void)memcpy(att_server->request_buffer, packet, size); 923 924 att_run_for_context(att_server, att_connection); 925 } 926 927 static void att_server_dispatch_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 928 hci_connection_t * hci_connection; 929 att_connection_t * att_connection; 930 att_server_t * att_server; 931 #ifdef ENABLE_GATT_OVER_CLASSIC 932 hci_con_handle_t con_handle; 933 bd_addr_t address; 934 btstack_linked_list_iterator_t it; 935 #endif 936 937 switch (packet_type){ 938 case HCI_EVENT_PACKET: 939 switch (packet[0]){ 940 #ifdef ENABLE_GATT_OVER_CLASSIC 941 case L2CAP_EVENT_CHANNEL_OPENED: 942 con_handle = l2cap_event_channel_opened_get_handle(packet); 943 hci_connection = hci_connection_for_handle(con_handle); 944 if (!hci_connection) break; 945 att_server = &hci_connection->att_server; 946 // store connection info 947 att_server->bearer_type = ATT_BEARER_UNENHANCED_CLASSIC; 948 att_server->peer_addr_type = BD_ADDR_TYPE_ACL; 949 l2cap_event_channel_opened_get_address(packet, att_server->peer_address); 950 att_connection = &hci_connection->att_connection; 951 att_connection->con_handle = con_handle; 952 // reset connection properties 953 att_server->state = ATT_SERVER_IDLE; 954 att_connection->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); 955 att_connection->max_mtu = l2cap_max_mtu(); 956 if (att_connection->max_mtu > ATT_REQUEST_BUFFER_SIZE){ 957 att_connection->max_mtu = ATT_REQUEST_BUFFER_SIZE; 958 } 959 960 log_info("Connection opened %s, l2cap cid %04x, mtu %u", bd_addr_to_str(address), att_server->l2cap_cid, att_connection->mtu); 961 962 // update security params 963 att_connection->encryption_key_size = gap_encryption_key_size(con_handle); 964 att_connection->authenticated = gap_authenticated(con_handle); 965 att_connection->secure_connection = gap_secure_connection(con_handle); 966 log_info("encrypted key size %u, authenticated %u, secure connection %u", 967 att_connection->encryption_key_size, att_connection->authenticated, att_connection->secure_connection); 968 969 // notify connection opened 970 att_emit_connected_event(att_server, att_connection); 971 972 // restore persisten ccc if encrypted 973 if ( gap_security_level(con_handle) >= LEVEL_2){ 974 att_server_persistent_ccc_restore(att_server, att_connection); 975 } 976 // TODO: what to do about le device db? 977 att_server->pairing_active = 0; 978 break; 979 #endif 980 case L2CAP_EVENT_CAN_SEND_NOW: 981 att_server_handle_can_send_now(); 982 break; 983 case ATT_EVENT_MTU_EXCHANGE_COMPLETE: 984 // GATT client has negotiated the mtu for this connection 985 hci_connection = hci_connection_for_handle(channel); 986 if (!hci_connection) break; 987 att_connection = &hci_connection->att_connection; 988 att_connection->mtu = little_endian_read_16(packet, 4); 989 break; 990 default: 991 break; 992 } 993 break; 994 995 case ATT_DATA_PACKET: 996 log_debug("ATT Packet, handle 0x%04x", channel); 997 hci_connection = hci_connection_for_handle(channel); 998 if (!hci_connection) break; 999 1000 att_server = &hci_connection->att_server; 1001 att_connection = &hci_connection->att_connection; 1002 att_server_handle_att_pdu(att_server, att_connection, packet, size); 1003 break; 1004 1005 #ifdef ENABLE_GATT_OVER_CLASSIC 1006 case L2CAP_DATA_PACKET: 1007 hci_connections_get_iterator(&it); 1008 while(btstack_linked_list_iterator_has_next(&it)){ 1009 hci_connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 1010 att_server = &hci_connection->att_server; 1011 att_connection = &hci_connection->att_connection; 1012 if (att_server->l2cap_cid == channel) { 1013 att_server_handle_att_pdu(att_server, att_connection, packet, size); 1014 break; 1015 } 1016 } 1017 break; 1018 #endif 1019 1020 default: 1021 break; 1022 } 1023 } 1024 1025 // --------------------- 1026 // persistent CCC writes 1027 static uint32_t att_server_persistent_ccc_tag_for_index(uint8_t index){ 1028 return ('B' << 24u) | ('T' << 16u) | ('C' << 8u) | index; 1029 } 1030 1031 static void att_server_persistent_ccc_write(hci_con_handle_t con_handle, uint16_t att_handle, uint16_t value){ 1032 // lookup att_server instance 1033 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 1034 if (!hci_connection) return; 1035 att_server_t * att_server = &hci_connection->att_server; 1036 int le_device_index = att_server->ir_le_device_db_index; 1037 log_info("Store CCC value 0x%04x for handle 0x%04x of remote %s, le device id %d", value, att_handle, bd_addr_to_str(att_server->peer_address), le_device_index); 1038 1039 // check if bonded 1040 if (le_device_index < 0) return; 1041 1042 // get btstack_tlv 1043 const btstack_tlv_t * tlv_impl = NULL; 1044 void * tlv_context; 1045 btstack_tlv_get_instance(&tlv_impl, &tlv_context); 1046 if (!tlv_impl) return; 1047 1048 // update ccc tag 1049 int index; 1050 uint32_t highest_seq_nr = 0; 1051 uint32_t lowest_seq_nr = 0; 1052 uint32_t tag_for_lowest_seq_nr = 0; 1053 uint32_t tag_for_empty = 0; 1054 persistent_ccc_entry_t entry; 1055 for (index=0; index<NVN_NUM_GATT_SERVER_CCC; index++){ 1056 uint32_t tag = att_server_persistent_ccc_tag_for_index(index); 1057 int len = tlv_impl->get_tag(tlv_context, tag, (uint8_t *) &entry, sizeof(persistent_ccc_entry_t)); 1058 1059 // empty/invalid tag 1060 if (len != sizeof(persistent_ccc_entry_t)){ 1061 tag_for_empty = tag; 1062 continue; 1063 } 1064 // update highest seq nr 1065 if (entry.seq_nr > highest_seq_nr){ 1066 highest_seq_nr = entry.seq_nr; 1067 } 1068 // find entry with lowest seq nr 1069 if ((tag_for_lowest_seq_nr == 0u) || (entry.seq_nr < lowest_seq_nr)){ 1070 tag_for_lowest_seq_nr = tag; 1071 lowest_seq_nr = entry.seq_nr; 1072 } 1073 1074 if (entry.device_index != le_device_index) continue; 1075 if (entry.att_handle != att_handle) continue; 1076 1077 // found matching entry 1078 if (value != 0){ 1079 // update 1080 if (entry.value == value) { 1081 log_info("CCC Index %u: Up-to-date", index); 1082 return; 1083 } 1084 entry.value = (uint8_t) value; 1085 entry.seq_nr = highest_seq_nr + 1u; 1086 log_info("CCC Index %u: Store", index); 1087 int result = tlv_impl->store_tag(tlv_context, tag, (const uint8_t *) &entry, sizeof(persistent_ccc_entry_t)); 1088 if (result != 0){ 1089 log_error("Store tag index %u failed", index); 1090 } 1091 } else { 1092 // delete 1093 log_info("CCC Index %u: Delete", index); 1094 tlv_impl->delete_tag(tlv_context, tag); 1095 } 1096 return; 1097 } 1098 1099 log_info("tag_for_empty %"PRIx32", tag_for_lowest_seq_nr %"PRIx32, tag_for_empty, tag_for_lowest_seq_nr); 1100 1101 if (value == 0u){ 1102 // done 1103 return; 1104 } 1105 1106 uint32_t tag_to_use = 0u; 1107 if (tag_for_empty != 0u){ 1108 tag_to_use = tag_for_empty; 1109 } else if (tag_for_lowest_seq_nr != 0){ 1110 tag_to_use = tag_for_lowest_seq_nr; 1111 } else { 1112 // should not happen 1113 return; 1114 } 1115 // store ccc tag 1116 entry.seq_nr = highest_seq_nr + 1u; 1117 entry.device_index = le_device_index; 1118 entry.att_handle = att_handle; 1119 entry.value = (uint8_t) value; 1120 int result = tlv_impl->store_tag(tlv_context, tag_to_use, (uint8_t *) &entry, sizeof(persistent_ccc_entry_t)); 1121 if (result != 0){ 1122 log_error("Store tag index %u failed", index); 1123 } 1124 } 1125 1126 static void att_server_persistent_ccc_clear(att_server_t * att_server){ 1127 int le_device_index = att_server->ir_le_device_db_index; 1128 log_info("Clear CCC values of remote %s, le device id %d", bd_addr_to_str(att_server->peer_address), le_device_index); 1129 // check if bonded 1130 if (le_device_index < 0) return; 1131 // get btstack_tlv 1132 const btstack_tlv_t * tlv_impl = NULL; 1133 void * tlv_context; 1134 btstack_tlv_get_instance(&tlv_impl, &tlv_context); 1135 if (!tlv_impl) return; 1136 // get all ccc tag 1137 int index; 1138 persistent_ccc_entry_t entry; 1139 for (index=0;index<NVN_NUM_GATT_SERVER_CCC;index++){ 1140 uint32_t tag = att_server_persistent_ccc_tag_for_index(index); 1141 int len = tlv_impl->get_tag(tlv_context, tag, (uint8_t *) &entry, sizeof(persistent_ccc_entry_t)); 1142 if (len != sizeof(persistent_ccc_entry_t)) continue; 1143 if (entry.device_index != le_device_index) continue; 1144 // delete entry 1145 log_info("CCC Index %u: Delete", index); 1146 tlv_impl->delete_tag(tlv_context, tag); 1147 } 1148 } 1149 1150 static void att_server_persistent_ccc_restore(att_server_t * att_server, att_connection_t * att_connection){ 1151 int le_device_index = att_server->ir_le_device_db_index; 1152 log_info("Restore CCC values of remote %s, le device id %d", bd_addr_to_str(att_server->peer_address), le_device_index); 1153 // check if bonded 1154 if (le_device_index < 0) return; 1155 // get btstack_tlv 1156 const btstack_tlv_t * tlv_impl = NULL; 1157 void * tlv_context; 1158 btstack_tlv_get_instance(&tlv_impl, &tlv_context); 1159 if (!tlv_impl) return; 1160 // get all ccc tag 1161 int index; 1162 persistent_ccc_entry_t entry; 1163 for (index=0;index<NVN_NUM_GATT_SERVER_CCC;index++){ 1164 uint32_t tag = att_server_persistent_ccc_tag_for_index(index); 1165 int len = tlv_impl->get_tag(tlv_context, tag, (uint8_t *) &entry, sizeof(persistent_ccc_entry_t)); 1166 if (len != sizeof(persistent_ccc_entry_t)) continue; 1167 if (entry.device_index != le_device_index) continue; 1168 // simulate write callback 1169 uint16_t attribute_handle = entry.att_handle; 1170 uint8_t value[2]; 1171 little_endian_store_16(value, 0, entry.value); 1172 att_write_callback_t callback = att_server_write_callback_for_handle(attribute_handle); 1173 if (!callback) continue; 1174 log_info("CCC Index %u: Set Attribute handle 0x%04x to value 0x%04x", index, attribute_handle, entry.value ); 1175 (*callback)(att_connection->con_handle, attribute_handle, ATT_TRANSACTION_MODE_NONE, 0, value, sizeof(value)); 1176 } 1177 } 1178 1179 // persistent CCC writes 1180 // --------------------- 1181 1182 // gatt service management 1183 static att_service_handler_t * att_service_handler_for_handle(uint16_t handle){ 1184 btstack_linked_list_iterator_t it; 1185 btstack_linked_list_iterator_init(&it, &service_handlers); 1186 while (btstack_linked_list_iterator_has_next(&it)){ 1187 att_service_handler_t * handler = (att_service_handler_t*) btstack_linked_list_iterator_next(&it); 1188 if (handler->start_handle > handle) continue; 1189 if (handler->end_handle < handle) continue; 1190 return handler; 1191 } 1192 return NULL; 1193 } 1194 1195 static att_write_callback_t att_server_write_callback_for_handle(uint16_t handle){ 1196 att_service_handler_t * handler = att_service_handler_for_handle(handle); 1197 if (handler != NULL) return handler->write_callback; 1198 return att_server_client_write_callback; 1199 } 1200 1201 static btstack_packet_handler_t att_server_packet_handler_for_handle(uint16_t handle){ 1202 att_service_handler_t * handler = att_service_handler_for_handle(handle); 1203 if (handler != NULL) return handler->packet_handler; 1204 return att_client_packet_handler; 1205 } 1206 1207 static void att_notify_write_callbacks(hci_con_handle_t con_handle, uint16_t transaction_mode){ 1208 // notify all callbacks 1209 btstack_linked_list_iterator_t it; 1210 btstack_linked_list_iterator_init(&it, &service_handlers); 1211 while (btstack_linked_list_iterator_has_next(&it)){ 1212 att_service_handler_t * handler = (att_service_handler_t*) btstack_linked_list_iterator_next(&it); 1213 if (!handler->write_callback) continue; 1214 (*handler->write_callback)(con_handle, 0, transaction_mode, 0, NULL, 0); 1215 } 1216 if (!att_server_client_write_callback) return; 1217 (*att_server_client_write_callback)(con_handle, 0, transaction_mode, 0, NULL, 0); 1218 } 1219 1220 // returns first reported error or 0 1221 static uint8_t att_validate_prepared_write(hci_con_handle_t con_handle){ 1222 btstack_linked_list_iterator_t it; 1223 btstack_linked_list_iterator_init(&it, &service_handlers); 1224 while (btstack_linked_list_iterator_has_next(&it)){ 1225 att_service_handler_t * handler = (att_service_handler_t*) btstack_linked_list_iterator_next(&it); 1226 if (!handler->write_callback) continue; 1227 uint8_t error_code = (*handler->write_callback)(con_handle, 0, ATT_TRANSACTION_MODE_VALIDATE, 0, NULL, 0); 1228 if (error_code != 0u) return error_code; 1229 } 1230 if (!att_server_client_write_callback) return 0; 1231 return (*att_server_client_write_callback)(con_handle, 0, ATT_TRANSACTION_MODE_VALIDATE, 0, NULL, 0); 1232 } 1233 1234 static uint16_t att_server_read_callback(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){ 1235 att_service_handler_t * service = att_service_handler_for_handle(attribute_handle); 1236 att_read_callback_t read_callback = (service != NULL) ? service->read_callback : att_server_client_read_callback; 1237 uint16_t result = 0; 1238 if (read_callback != NULL){ 1239 result = (*read_callback)(con_handle, attribute_handle, offset, buffer, buffer_size); 1240 #ifdef ENABLE_ATT_DELAYED_RESPONSE 1241 if (result == ATT_READ_RESPONSE_PENDING){ 1242 if (service == NULL){ 1243 att_server_flags |= ATT_SERVICE_FLAGS_DELAYED_RESPONSE; 1244 } else { 1245 service->flags |= ATT_SERVICE_FLAGS_DELAYED_RESPONSE; 1246 } 1247 } 1248 #endif 1249 } 1250 return result; 1251 } 1252 1253 static int att_server_write_callback(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size){ 1254 switch (transaction_mode){ 1255 case ATT_TRANSACTION_MODE_VALIDATE: 1256 return att_validate_prepared_write(con_handle); 1257 case ATT_TRANSACTION_MODE_EXECUTE: 1258 case ATT_TRANSACTION_MODE_CANCEL: 1259 att_notify_write_callbacks(con_handle, transaction_mode); 1260 return 0; 1261 default: 1262 break; 1263 } 1264 1265 // track CCC writes 1266 if (att_is_persistent_ccc(attribute_handle) && (offset == 0u) && (buffer_size == 2u)){ 1267 att_server_persistent_ccc_write(con_handle, attribute_handle, little_endian_read_16(buffer, 0)); 1268 } 1269 1270 att_write_callback_t callback = att_server_write_callback_for_handle(attribute_handle); 1271 if (!callback) return 0; 1272 return (*callback)(con_handle, attribute_handle, transaction_mode, offset, buffer, buffer_size); 1273 } 1274 1275 /** 1276 * @brief register read/write callbacks for specific handle range 1277 * @param att_service_handler_t 1278 */ 1279 void att_server_register_service_handler(att_service_handler_t * handler){ 1280 bool att_server_registered = false; 1281 if (att_service_handler_for_handle(handler->start_handle) != NULL){ 1282 att_server_registered = true; 1283 } 1284 1285 if (att_service_handler_for_handle(handler->end_handle) != NULL){ 1286 att_server_registered = true; 1287 } 1288 1289 if (att_server_registered){ 1290 log_error("handler for range 0x%04x-0x%04x already registered", handler->start_handle, handler->end_handle); 1291 return; 1292 } 1293 1294 handler->flags = 0; 1295 btstack_linked_list_add(&service_handlers, (btstack_linked_item_t*) handler); 1296 } 1297 1298 void att_server_init(uint8_t const * db, att_read_callback_t read_callback, att_write_callback_t write_callback){ 1299 1300 // store callbacks 1301 att_server_client_read_callback = read_callback; 1302 att_server_client_write_callback = write_callback; 1303 1304 // register for HCI Events 1305 hci_event_callback_registration.callback = &att_server_event_packet_handler; 1306 hci_add_event_handler(&hci_event_callback_registration); 1307 1308 // register for SM events 1309 sm_event_callback_registration.callback = &att_server_event_packet_handler; 1310 sm_add_event_handler(&sm_event_callback_registration); 1311 1312 // and L2CAP ATT Server PDUs 1313 att_dispatch_register_server(att_server_dispatch_packet_handler); 1314 1315 #ifdef ENABLE_GATT_OVER_CLASSIC 1316 // setup l2cap service 1317 att_dispatch_classic_register_service(); 1318 #endif 1319 1320 att_set_db(db); 1321 att_set_read_callback(att_server_read_callback); 1322 att_set_write_callback(att_server_write_callback); 1323 } 1324 1325 void att_server_register_packet_handler(btstack_packet_handler_t handler){ 1326 att_client_packet_handler = handler; 1327 } 1328 1329 1330 // to be deprecated 1331 int att_server_can_send_packet_now(hci_con_handle_t con_handle){ 1332 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 1333 if (!hci_connection) return 0; 1334 att_server_t * att_server = &hci_connection->att_server; 1335 att_connection_t * att_connection = &hci_connection->att_connection; 1336 return att_server_can_send_packet(att_server, att_connection); 1337 } 1338 1339 uint8_t att_server_register_can_send_now_callback(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 1340 return att_server_request_to_send_notification(callback_registration, con_handle); 1341 } 1342 1343 void att_server_request_can_send_now_event(hci_con_handle_t con_handle){ 1344 att_client_waiting_for_can_send_registration.callback = &att_emit_can_send_now_event; 1345 att_server_request_to_send_notification(&att_client_waiting_for_can_send_registration, con_handle); 1346 } 1347 // end of deprecated 1348 1349 uint8_t att_server_request_to_send_notification(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 1350 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 1351 if (!hci_connection) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 1352 att_server_t * att_server = &hci_connection->att_server; 1353 att_connection_t * att_connection = &hci_connection->att_connection; 1354 bool added = btstack_linked_list_add_tail(&att_server->notification_requests, (btstack_linked_item_t*) callback_registration); 1355 att_server_request_can_send_now(att_server, att_connection); 1356 if (added){ 1357 return ERROR_CODE_SUCCESS; 1358 } else { 1359 return ERROR_CODE_COMMAND_DISALLOWED; 1360 } 1361 } 1362 1363 uint8_t att_server_request_to_send_indication(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ 1364 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 1365 if (!hci_connection) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 1366 att_server_t * att_server = &hci_connection->att_server; 1367 att_connection_t * att_connection = &hci_connection->att_connection; 1368 bool added = btstack_linked_list_add_tail(&att_server->indication_requests, (btstack_linked_item_t*) callback_registration); 1369 att_server_request_can_send_now(att_server, att_connection); 1370 if (added){ 1371 return ERROR_CODE_SUCCESS; 1372 } else { 1373 return ERROR_CODE_COMMAND_DISALLOWED; 1374 } 1375 } 1376 1377 static uint8_t att_server_prepare_server_message(hci_con_handle_t con_handle, att_server_t ** out_att_server, att_connection_t ** out_att_connection, uint8_t ** out_packet_buffer){ 1378 1379 att_server_t * att_server = NULL; 1380 att_connection_t * att_connection = NULL; 1381 uint8_t * packet_buffer = NULL; 1382 1383 // prefer enhanced bearer 1384 #ifdef ENABLE_GATT_OVER_EATT 1385 att_server_eatt_bearer_t * eatt_bearer = att_server_eatt_bearer_for_con_handle(con_handle); 1386 if (eatt_bearer != NULL){ 1387 att_server = &eatt_bearer->att_server; 1388 att_connection = &eatt_bearer->att_connection; 1389 packet_buffer = eatt_bearer->send_buffer; 1390 } else 1391 #endif 1392 { 1393 hci_connection_t *hci_connection = hci_connection_for_handle(con_handle); 1394 if (hci_connection != NULL) { 1395 att_server = &hci_connection->att_server; 1396 att_connection = &hci_connection->att_connection; 1397 } 1398 } 1399 1400 if (att_server == NULL) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 1401 if (!att_server_can_send_packet(att_server, att_connection)) return BTSTACK_ACL_BUFFERS_FULL; 1402 1403 if (packet_buffer == NULL){ 1404 l2cap_reserve_packet_buffer(); 1405 packet_buffer = l2cap_get_outgoing_buffer(); 1406 } 1407 1408 *out_att_connection = att_connection; 1409 *out_att_server = att_server; 1410 *out_packet_buffer = packet_buffer; 1411 return ERROR_CODE_SUCCESS; 1412 } 1413 1414 uint8_t att_server_notify(hci_con_handle_t con_handle, uint16_t attribute_handle, const uint8_t *value, uint16_t value_len){ 1415 att_server_t * att_server = NULL; 1416 att_connection_t * att_connection = NULL; 1417 uint8_t * packet_buffer = NULL; 1418 1419 uint8_t status = att_server_prepare_server_message(con_handle, &att_server, &att_connection, &packet_buffer); 1420 if (status != ERROR_CODE_SUCCESS){ 1421 return status; 1422 } 1423 1424 uint16_t size = att_prepare_handle_value_notification(att_connection, attribute_handle, value, value_len, packet_buffer); 1425 1426 return att_server_send_prepared(att_server, att_connection, NULL, size); 1427 } 1428 1429 /** 1430 * @brief notify client about multiple attribute value changes 1431 * @param con_handle 1432 * @param num_attributes 1433 * @param attribute_handles[] 1434 * @param values_data[] 1435 * @param values_len[] 1436 * @return 0 if ok, error otherwise 1437 */ 1438 uint8_t att_server_multiple_notify(hci_con_handle_t con_handle, uint8_t num_attributes, 1439 const uint16_t * attribute_handles, const uint8_t ** values_data, const uint16_t * values_len){ 1440 1441 att_server_t * att_server = NULL; 1442 att_connection_t * att_connection = NULL; 1443 uint8_t * packet_buffer = NULL; 1444 1445 uint8_t status = att_server_prepare_server_message(con_handle, &att_server, &att_connection, &packet_buffer); 1446 if (status != ERROR_CODE_SUCCESS){ 1447 return status; 1448 } 1449 1450 uint16_t size = att_prepare_handle_value_multiple_notification(att_connection, num_attributes, attribute_handles, values_data, values_len, packet_buffer); 1451 1452 return att_server_send_prepared(att_server, att_connection, packet_buffer, size); 1453 } 1454 1455 uint8_t att_server_indicate(hci_con_handle_t con_handle, uint16_t attribute_handle, const uint8_t *value, uint16_t value_len){ 1456 1457 att_server_t * att_server = NULL; 1458 att_connection_t * att_connection = NULL; 1459 uint8_t * packet_buffer = NULL; 1460 1461 uint8_t status = att_server_prepare_server_message(con_handle, &att_server, &att_connection, &packet_buffer); 1462 if (status != ERROR_CODE_SUCCESS){ 1463 return status; 1464 } 1465 1466 if (att_server->value_indication_handle != 0u) { 1467 // free reserved packet buffer 1468 if (att_server->bearer_type == ATT_BEARER_ENHANCED_LE){ 1469 l2cap_release_packet_buffer(); 1470 } 1471 return ATT_HANDLE_VALUE_INDICATION_IN_PROGRESS; 1472 } 1473 1474 // track indication 1475 att_server->value_indication_handle = attribute_handle; 1476 btstack_run_loop_set_timer_handler(&att_server->value_indication_timer, att_handle_value_indication_timeout); 1477 btstack_run_loop_set_timer(&att_server->value_indication_timer, ATT_TRANSACTION_TIMEOUT_MS); 1478 btstack_run_loop_add_timer(&att_server->value_indication_timer); 1479 1480 uint16_t size = att_prepare_handle_value_indication(att_connection, attribute_handle, value, value_len, packet_buffer); 1481 1482 return att_server_send_prepared(att_server, att_connection, NULL, size); 1483 } 1484 1485 uint16_t att_server_get_mtu(hci_con_handle_t con_handle){ 1486 hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); 1487 if (!hci_connection) return 0; 1488 att_connection_t * att_connection = &hci_connection->att_connection; 1489 return att_connection->mtu; 1490 } 1491 1492 void att_server_deinit(void){ 1493 att_server_client_read_callback = NULL; 1494 att_server_client_write_callback = NULL; 1495 att_client_packet_handler = NULL; 1496 service_handlers = NULL; 1497 att_server_flags = 0; 1498 } 1499 1500 #ifdef ENABLE_GATT_OVER_EATT 1501 1502 #define MAX_NR_EATT_CHANNELS 5 1503 1504 static uint16_t att_server_eatt_receive_buffer_size; 1505 static uint16_t att_server_eatt_send_buffer_size; 1506 1507 static att_server_eatt_bearer_t * att_server_eatt_bearer_for_cid(uint16_t cid){ 1508 btstack_linked_list_iterator_t it; 1509 btstack_linked_list_iterator_init(&it, &att_server_eatt_bearer_active); 1510 while(btstack_linked_list_iterator_has_next(&it)){ 1511 att_server_eatt_bearer_t * eatt_bearer = (att_server_eatt_bearer_t *) btstack_linked_list_iterator_next(&it); 1512 if (eatt_bearer->att_server.l2cap_cid == cid) { 1513 return eatt_bearer; 1514 } 1515 } 1516 return NULL; 1517 } 1518 1519 static att_server_eatt_bearer_t * att_server_eatt_bearer_for_con_handle(hci_con_handle_t con_handle){ 1520 btstack_linked_list_iterator_t it; 1521 btstack_linked_list_iterator_init(&it, &att_server_eatt_bearer_active); 1522 while(btstack_linked_list_iterator_has_next(&it)){ 1523 att_server_eatt_bearer_t * eatt_bearer = (att_server_eatt_bearer_t *) btstack_linked_list_iterator_next(&it); 1524 if (eatt_bearer->att_connection.con_handle == con_handle) { 1525 return eatt_bearer; 1526 } 1527 } 1528 return NULL; 1529 } 1530 1531 static void att_server_eatt_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1532 uint16_t cid; 1533 uint8_t status; 1534 uint16_t remote_mtu; 1535 1536 uint8_t i; 1537 uint8_t num_requested_bearers; 1538 uint8_t num_accepted_bearers; 1539 uint16_t initial_credits = L2CAP_LE_AUTOMATIC_CREDITS; 1540 uint8_t * receive_buffers[MAX_NR_EATT_CHANNELS]; 1541 uint16_t cids[MAX_NR_EATT_CHANNELS]; 1542 att_server_eatt_bearer_t * eatt_bearers[MAX_NR_EATT_CHANNELS]; 1543 att_server_eatt_bearer_t * eatt_bearer; 1544 att_server_t * att_server; 1545 att_connection_t * att_connection; 1546 hci_con_handle_t con_handle; 1547 hci_connection_t * hci_connection; 1548 1549 switch (packet_type) { 1550 1551 case L2CAP_DATA_PACKET: 1552 eatt_bearer = att_server_eatt_bearer_for_cid(channel); 1553 btstack_assert(eatt_bearer != NULL); 1554 att_server = &eatt_bearer->att_server; 1555 att_connection = &eatt_bearer->att_connection; 1556 att_server_handle_att_pdu(att_server, att_connection, packet, size); 1557 break; 1558 1559 case HCI_EVENT_PACKET: 1560 switch (packet[0]) { 1561 1562 case L2CAP_EVENT_CAN_SEND_NOW: 1563 cid = l2cap_event_packet_sent_get_local_cid(packet); 1564 eatt_bearer = att_server_eatt_bearer_for_cid(cid); 1565 btstack_assert(eatt_bearer != NULL); 1566 att_server = &eatt_bearer->att_server; 1567 att_connection = &eatt_bearer->att_connection; 1568 // only used for EATT request responses 1569 btstack_assert(att_server->state == ATT_SERVER_REQUEST_RECEIVED_AND_VALIDATED); 1570 att_server_process_validated_request(att_server, att_connection, eatt_bearer->send_buffer); 1571 break; 1572 1573 case L2CAP_EVENT_PACKET_SENT: 1574 cid = l2cap_event_packet_sent_get_local_cid(packet); 1575 eatt_bearer = att_server_eatt_bearer_for_cid(cid); 1576 btstack_assert(eatt_bearer != NULL); 1577 att_server = &eatt_bearer->att_server; 1578 att_connection = &eatt_bearer->att_connection; 1579 att_server_handle_att_pdu(att_server, att_connection, packet, size); 1580 break; 1581 1582 case L2CAP_EVENT_ECBM_INCOMING_CONNECTION: 1583 cid = l2cap_event_ecbm_incoming_connection_get_local_cid(packet); 1584 1585 // reject if outgoing l2cap connection active, L2CAP/TIM/BV-01-C 1586 con_handle = l2cap_event_ecbm_incoming_connection_get_handle(packet); 1587 hci_connection = hci_connection_for_handle(con_handle); 1588 btstack_assert(hci_connection != NULL); 1589 if (hci_connection->att_server.eatt_outgoing_active) { 1590 hci_connection->att_server.incoming_connection_request = true; 1591 l2cap_ecbm_decline_channels(cid, L2CAP_ECBM_CONNECTION_RESULT_SOME_REFUSED_INSUFFICIENT_RESOURCES_AVAILABLE ); 1592 log_info("Decline incoming connection from %s", bd_addr_to_str(hci_connection->address)); 1593 } else { 1594 num_requested_bearers = l2cap_event_ecbm_incoming_connection_get_num_channels(packet); 1595 for (i = 0; i < num_requested_bearers; i++){ 1596 eatt_bearers[i] = (att_server_eatt_bearer_t *) btstack_linked_list_pop(&att_server_eatt_bearer_pool); 1597 if (eatt_bearers[i] == NULL) { 1598 break; 1599 } 1600 eatt_bearers[i]->att_connection.con_handle = l2cap_event_ecbm_incoming_connection_get_handle(packet); 1601 eatt_bearers[i]->att_server.bearer_type = ATT_BEARER_ENHANCED_LE; 1602 receive_buffers[i] = eatt_bearers[i]->receive_buffer; 1603 btstack_linked_list_add(&att_server_eatt_bearer_active, (btstack_linked_item_t *) eatt_bearers[i]); 1604 } 1605 num_accepted_bearers = i; 1606 status = l2cap_ecbm_accept_channels(cid, num_accepted_bearers, initial_credits, att_server_eatt_receive_buffer_size, receive_buffers, cids); 1607 btstack_assert(status == ERROR_CODE_SUCCESS); 1608 log_info("requested %u, accepted %u", num_requested_bearers, num_accepted_bearers); 1609 for (i=0;i<num_accepted_bearers;i++){ 1610 log_info("eatt l2cap cid: 0x%04x", cids[i]); 1611 eatt_bearers[i]->att_server.l2cap_cid = cids[i]; 1612 } 1613 } 1614 break; 1615 1616 case L2CAP_EVENT_ECBM_CHANNEL_OPENED: 1617 cid = l2cap_event_ecbm_channel_opened_get_local_cid(packet); 1618 status = l2cap_event_ecbm_channel_opened_get_status(packet); 1619 remote_mtu = l2cap_event_ecbm_channel_opened_get_remote_mtu(packet); 1620 eatt_bearer = att_server_eatt_bearer_for_cid(cid); 1621 btstack_assert(eatt_bearer != NULL); 1622 eatt_bearer->att_connection.mtu_exchanged = true; 1623 eatt_bearer->att_connection.mtu = remote_mtu; 1624 eatt_bearer->att_connection.max_mtu = remote_mtu; 1625 log_info("L2CAP_EVENT_ECBM_CHANNEL_OPENED - cid 0x%04x mtu %u, status 0x%02x", cid, remote_mtu, status); 1626 break; 1627 1628 case L2CAP_EVENT_ECBM_RECONFIGURED: 1629 break; 1630 1631 case L2CAP_EVENT_CHANNEL_CLOSED: 1632 eatt_bearer = att_server_eatt_bearer_for_cid(l2cap_event_channel_closed_get_local_cid(packet)); 1633 btstack_assert(eatt_bearers != NULL); 1634 1635 // TODO: finalize - abort queued writes 1636 1637 btstack_linked_list_remove(&att_server_eatt_bearer_active, (btstack_linked_item_t *) eatt_bearer); 1638 btstack_linked_list_add(&att_server_eatt_bearer_pool, (btstack_linked_item_t *) eatt_bearer); 1639 break; 1640 default: 1641 break; 1642 } 1643 break; 1644 default: 1645 btstack_unreachable(); 1646 break; 1647 } 1648 } 1649 1650 // create eatt bearers 1651 uint8_t att_server_eatt_init(uint8_t num_eatt_bearers, uint8_t * storage_buffer, uint16_t storage_size){ 1652 uint16_t size_for_structs = num_eatt_bearers * sizeof(att_server_eatt_bearer_t); 1653 if (storage_size < size_for_structs) { 1654 return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; 1655 } 1656 1657 // TODO: The minimum ATT_MTU for an Enhanced ATT bearer is 64 octets. 1658 1659 memset(storage_buffer, 0, storage_size); 1660 uint16_t buffer_size_per_bearer = ((storage_size - size_for_structs) / num_eatt_bearers); 1661 att_server_eatt_receive_buffer_size = buffer_size_per_bearer / 2; 1662 att_server_eatt_send_buffer_size = buffer_size_per_bearer / 2; 1663 uint8_t * bearer_buffer = &storage_buffer[size_for_structs]; 1664 uint8_t i; 1665 att_server_eatt_bearer_t * eatt_bearer = (att_server_eatt_bearer_t *) storage_buffer; 1666 log_info("%u EATT bearers with receive buffer size %u", 1667 num_eatt_bearers, att_server_eatt_receive_buffer_size); 1668 for (i=0;i<num_eatt_bearers;i++){ 1669 eatt_bearer->att_connection.con_handle = HCI_CON_HANDLE_INVALID; 1670 eatt_bearer->receive_buffer = bearer_buffer; 1671 bearer_buffer += att_server_eatt_receive_buffer_size; 1672 eatt_bearer->send_buffer = bearer_buffer; 1673 bearer_buffer += att_server_eatt_send_buffer_size; 1674 btstack_linked_list_add(&att_server_eatt_bearer_pool, (btstack_linked_item_t *) eatt_bearer); 1675 eatt_bearer++; 1676 } 1677 // TODO: define minimum EATT MTU 1678 l2cap_ecbm_register_service(att_server_eatt_handler, BLUETOOTH_PSM_EATT, 64, 0, false); 1679 1680 return 0; 1681 } 1682 #endif 1683