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 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 34 * [email protected] 35 * 36 */ 37 38 #include <stdarg.h> 39 #include "btstack_tlv.h" 40 #include "mesh/mesh_foundation.h" 41 #include "mesh_upper_transport.h" 42 #include "mesh/mesh.h" 43 #include "mesh/mesh_proxy.h" 44 #include "mesh/mesh_node.h" 45 46 #define BTSTACK_FILE__ "mesh_upper_transport.c" 47 48 #include "mesh/mesh_upper_transport.h" 49 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 54 #include "btstack_util.h" 55 #include "btstack_memory.h" 56 #include "btstack_debug.h" 57 #include "btstack_bool.h" 58 59 #include "mesh/beacon.h" 60 #include "mesh/mesh_iv_index_seq_number.h" 61 #include "mesh/mesh_keys.h" 62 #include "mesh/mesh_lower_transport.h" 63 #include "mesh/mesh_peer.h" 64 #include "mesh/mesh_virtual_addresses.h" 65 66 // TODO: extract mesh_pdu functions into lower transport or network 67 #include "mesh/mesh_access.h" 68 69 // MESH_ACCESS_MESH_NETWORK_PAYLOAD_MAX (384) / MESH_NETWORK_PAYLOAD_MAX (29) = 13.24.. < 14 70 #define MESSAGE_BUILDER_MAX_NUM_NETWORK_PDUS (14) 71 72 // combined key x address iterator for upper transport decryption 73 74 typedef struct { 75 // state 76 mesh_transport_key_iterator_t key_it; 77 mesh_virtual_address_iterator_t address_it; 78 // elements 79 const mesh_transport_key_t * key; 80 const mesh_virtual_address_t * address; 81 // address - might be virtual 82 uint16_t dst; 83 // key info 84 } mesh_transport_key_and_virtual_address_iterator_t; 85 86 static void mesh_upper_transport_run(void); 87 static void mesh_upper_transport_schedule_send_requests(void); 88 static void mesh_upper_transport_validate_access_message(void); 89 90 // upper transport callbacks - in access layer 91 static void (*mesh_access_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 92 static void (*mesh_control_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 93 94 // 95 static int crypto_active; 96 static uint8_t application_nonce[13]; 97 static btstack_crypto_ccm_t ccm; 98 static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; 99 100 // incoming segmented (mesh_segmented_pdu_t) or unsegmented (network_pdu_t) 101 static mesh_pdu_t * incoming_access_encrypted; 102 103 // multi-purpose union: segmented control reassembly, decrypted access pdu 104 static union { 105 mesh_control_pdu_t control; 106 mesh_access_pdu_t access; 107 } incoming_pdu_singleton; 108 109 // pointer to incoming_pdu_singleton.access 110 static mesh_access_pdu_t * incoming_access_decrypted; 111 112 // pointer to incoming_pdu_singleton.access 113 static mesh_control_pdu_t * incoming_control_pdu; 114 115 // incoming incoming_access_decrypted ready to be deliverd 116 static bool incoming_access_pdu_ready; 117 118 // incoming unsegmented (network) and segmented (transport) control and access messages 119 static btstack_linked_list_t upper_transport_incoming; 120 121 122 // outgoing unsegmented and segmented control and access messages 123 static btstack_linked_list_t upper_transport_outgoing; 124 125 // outgoing upper transport messages that have been sent to lower transport and wait for sent event 126 static btstack_linked_list_t upper_transport_outgoing_active; 127 128 // outgoing send requests 129 static btstack_linked_list_t upper_transport_send_requests; 130 131 // message builder buffers 132 static mesh_upper_transport_pdu_t * message_builder_reserved_upper_pdu; 133 static uint8_t message_builder_num_network_pdus_reserved; 134 static btstack_linked_list_t message_builder_reserved_network_pdus; 135 136 // requets network pdus for outgoing send requests and outgoing run 137 static bool upper_transport_need_pdu_for_send_requests; 138 static bool upper_transport_need_pdu_for_run_outgoing; 139 140 // TODO: higher layer define used for assert 141 #define MESH_ACCESS_OPCODE_NOT_SET 0xFFFFFFFEu 142 143 static void mesh_print_hex(const char * name, const uint8_t * data, uint16_t len){ 144 printf("%-20s ", name); 145 printf_hexdump(data, len); 146 } 147 // static void mesh_print_x(const char * name, uint32_t value){ 148 // printf("%20s: 0x%x", name, (int) value); 149 // } 150 151 static void mesh_transport_key_and_virtual_address_iterator_init(mesh_transport_key_and_virtual_address_iterator_t *it, 152 uint16_t dst, uint16_t netkey_index, uint8_t akf, 153 uint8_t aid) { 154 printf("KEY_INIT: dst %04x, akf %x, aid %x\n", dst, akf, aid); 155 // config 156 it->dst = dst; 157 // init elements 158 it->key = NULL; 159 it->address = NULL; 160 // init element iterators 161 mesh_transport_key_aid_iterator_init(&it->key_it, netkey_index, akf, aid); 162 // init address iterator 163 if (mesh_network_address_virtual(it->dst)){ 164 mesh_virtual_address_iterator_init(&it->address_it, dst); 165 // get first key 166 if (mesh_transport_key_aid_iterator_has_more(&it->key_it)) { 167 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 168 } 169 } 170 } 171 172 // cartesian product: keys x addressses 173 static int mesh_transport_key_and_virtual_address_iterator_has_more(mesh_transport_key_and_virtual_address_iterator_t * it){ 174 if (mesh_network_address_virtual(it->dst)) { 175 // find next valid entry 176 while (true){ 177 if (mesh_virtual_address_iterator_has_more(&it->address_it)) return 1; 178 if (!mesh_transport_key_aid_iterator_has_more(&it->key_it)) return 0; 179 // get next key 180 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 181 mesh_virtual_address_iterator_init(&it->address_it, it->dst); 182 } 183 } else { 184 return mesh_transport_key_aid_iterator_has_more(&it->key_it); 185 } 186 } 187 188 static void mesh_transport_key_and_virtual_address_iterator_next(mesh_transport_key_and_virtual_address_iterator_t * it){ 189 if (mesh_network_address_virtual(it->dst)) { 190 it->address = mesh_virtual_address_iterator_get_next(&it->address_it); 191 } else { 192 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 193 } 194 } 195 196 // UPPER TRANSPORT 197 198 static void mesh_segmented_pdu_flatten(btstack_linked_list_t * segments, uint8_t segment_len, uint8_t * buffer) { 199 // assemble payload 200 btstack_linked_list_iterator_t it; 201 btstack_linked_list_iterator_init(&it, segments); 202 while (btstack_linked_list_iterator_has_next(&it)) { 203 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 204 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 205 uint8_t offset = 0; 206 while (offset < segment->len){ 207 uint8_t seg_o = segment->data[offset++]; 208 (void) memcpy(&buffer[seg_o * segment_len], &segment->data[offset], segment_len); 209 offset += segment_len; 210 } 211 } 212 } 213 214 static uint16_t mesh_upper_pdu_flatten(mesh_upper_transport_pdu_t * upper_pdu, uint8_t * buffer, uint16_t buffer_len) { 215 // assemble payload 216 btstack_linked_list_iterator_t it; 217 btstack_linked_list_iterator_init(&it, &upper_pdu->segments); 218 uint16_t offset = 0; 219 while (btstack_linked_list_iterator_has_next(&it)) { 220 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 221 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 222 btstack_assert((offset + segment->len) <= buffer_len); 223 (void) memcpy(&buffer[offset], segment->data, segment->len); 224 offset += segment->len; 225 } 226 return offset; 227 } 228 229 // store payload in provided list of network pdus 230 static void mesh_segmented_store_payload(const uint8_t * payload, uint16_t payload_len, btstack_linked_list_t * in_segments, btstack_linked_list_t * out_segments){ 231 uint16_t payload_offset = 0; 232 uint16_t bytes_current_segment = 0; 233 mesh_network_pdu_t * network_pdu = NULL; 234 while (payload_offset < payload_len){ 235 if (bytes_current_segment == 0){ 236 network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(in_segments); 237 btstack_assert(network_pdu != NULL); 238 btstack_linked_list_add_tail(out_segments, (btstack_linked_item_t *) network_pdu); 239 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX; 240 } 241 uint16_t bytes_to_copy = btstack_min(bytes_current_segment, payload_len - payload_offset); 242 (void) memcpy(&network_pdu->data[network_pdu->len], &payload[payload_offset], bytes_to_copy); 243 bytes_current_segment -= bytes_to_copy; 244 network_pdu->len += bytes_to_copy; 245 payload_offset += bytes_to_copy; 246 } 247 } 248 249 // tries allocate and add enough segments to store payload of given size 250 static bool mesh_segmented_allocate_segments(btstack_linked_list_t * segments, uint16_t payload_len){ 251 uint16_t storage_size = btstack_linked_list_count(segments) * MESH_NETWORK_PAYLOAD_MAX; 252 while (storage_size < payload_len){ 253 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 254 if (network_pdu == NULL) break; 255 storage_size += MESH_NETWORK_PAYLOAD_MAX; 256 btstack_linked_list_add(segments, (btstack_linked_item_t *) network_pdu); 257 } 258 return (storage_size >= payload_len); 259 } 260 261 // stub lower transport 262 263 static void mesh_upper_transport_dump_pdus(const char *name, btstack_linked_list_t *list){ 264 printf("List: %s:\n", name); 265 btstack_linked_list_iterator_t it; 266 btstack_linked_list_iterator_init(&it, list); 267 while (btstack_linked_list_iterator_has_next(&it)){ 268 mesh_pdu_t * pdu = (mesh_pdu_t*) btstack_linked_list_iterator_next(&it); 269 printf("- %p\n", pdu); 270 // printf_hexdump( mesh_pdu_data(pdu), mesh_pdu_len(pdu)); 271 } 272 } 273 274 static void mesh_upper_transport_reset_pdus(btstack_linked_list_t *list){ 275 while (!btstack_linked_list_empty(list)){ 276 mesh_upper_transport_pdu_free((mesh_pdu_t *) btstack_linked_list_pop(list)); 277 } 278 } 279 280 void mesh_upper_transport_dump(void){ 281 mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); 282 } 283 284 void mesh_upper_transport_reset(void){ 285 crypto_active = 0; 286 mesh_upper_transport_reset_pdus(&upper_transport_incoming); 287 } 288 289 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 290 // Device Key is fixed 291 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 292 return mesh_transport_key_get(appkey_index); 293 } 294 295 // Get key refresh state from subnet 296 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 297 if (subnet == NULL) return NULL; 298 299 // identify old and new app keys for given appkey_index 300 mesh_transport_key_t * old_key = NULL; 301 mesh_transport_key_t * new_key = NULL; 302 mesh_transport_key_iterator_t it; 303 mesh_transport_key_iterator_init(&it, netkey_index); 304 while (mesh_transport_key_iterator_has_more(&it)){ 305 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 306 if (transport_key->appkey_index != appkey_index) continue; 307 if (transport_key->old_key == 0) { 308 new_key = transport_key; 309 } else { 310 old_key = transport_key; 311 } 312 } 313 314 // if no key is marked as old, just use the current one 315 if (old_key == NULL) return new_key; 316 317 // use new key if it exists in phase two 318 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 319 return new_key; 320 } else { 321 return old_key; 322 } 323 } 324 325 static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ 326 // get IV Index and IVI 327 uint32_t iv_index = mesh_get_iv_index(); 328 int ivi = ivi_nid >> 7; 329 330 // if least significant bit differs, use previous IV Index 331 if ((iv_index & 1 ) ^ ivi){ 332 iv_index--; 333 } 334 return iv_index; 335 } 336 337 static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 338 mesh_access_pdu_t * access_pdu; 339 mesh_upper_transport_pdu_t * upper_pdu; 340 switch (pdu->pdu_type){ 341 case MESH_PDU_TYPE_ACCESS: 342 access_pdu = (mesh_access_pdu_t *) pdu; 343 nonce[1] = ((access_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 0x80 : 0x00; 344 big_endian_store_24(nonce, 2, access_pdu->seq); 345 big_endian_store_16(nonce, 5, access_pdu->src); 346 big_endian_store_16(nonce, 7, access_pdu->dst); 347 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(access_pdu->ivi_nid)); 348 break; 349 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 350 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 351 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 352 nonce[1] = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 0x80 : 0x00; 353 // 'network header' 354 big_endian_store_24(nonce, 2, upper_pdu->seq); 355 big_endian_store_16(nonce, 5, upper_pdu->src); 356 big_endian_store_16(nonce, 7, upper_pdu->dst); 357 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(upper_pdu->ivi_nid)); 358 break; 359 default: 360 btstack_assert(0); 361 break; 362 } 363 } 364 365 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 366 nonce[0] = 0x01; 367 transport_segmented_setup_nonce(nonce, pdu); 368 mesh_print_hex("AppNonce", nonce, 13); 369 } 370 371 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 372 nonce[0] = 0x02; 373 transport_segmented_setup_nonce(nonce, pdu); 374 mesh_print_hex("DeviceNonce", nonce, 13); 375 } 376 377 static void mesh_upper_transport_process_access_message_done(mesh_access_pdu_t *access_pdu){ 378 crypto_active = 0; 379 btstack_assert((access_pdu->ctl_ttl & 0x80) == 0); 380 mesh_lower_transport_message_processed_by_higher_layer(incoming_access_encrypted); 381 incoming_access_encrypted = NULL; 382 incoming_access_decrypted = NULL; 383 mesh_upper_transport_run(); 384 } 385 386 static void mesh_upper_transport_process_control_message_done(mesh_control_pdu_t * control_pdu){ 387 UNUSED(control_pdu); 388 crypto_active = 0; 389 incoming_control_pdu = NULL; 390 mesh_upper_transport_run(); 391 } 392 393 static void mesh_upper_transport_network_pdu_freed(void){ 394 // call both while prioritizing run outgoing 395 // both functions will trigger request for network pdu if needed 396 if (upper_transport_need_pdu_for_run_outgoing){ 397 upper_transport_need_pdu_for_run_outgoing = false; 398 mesh_upper_transport_run(); 399 } 400 if (upper_transport_need_pdu_for_send_requests){ 401 upper_transport_need_pdu_for_send_requests = false; 402 mesh_upper_transport_schedule_send_requests(); 403 } 404 } 405 406 static void mesh_upper_transport_need_pdu_for_send_requests(void) { 407 bool waiting = upper_transport_need_pdu_for_send_requests || upper_transport_need_pdu_for_run_outgoing; 408 upper_transport_need_pdu_for_send_requests = true; 409 if (waiting == false) { 410 mesh_network_notify_on_freed_pdu(&mesh_upper_transport_network_pdu_freed); 411 } 412 } 413 static void mesh_upper_transport_need_pdu_for_run_outgoing(void) { 414 bool waiting = upper_transport_need_pdu_for_send_requests || upper_transport_need_pdu_for_run_outgoing; 415 upper_transport_need_pdu_for_run_outgoing = true; 416 if (waiting == false) { 417 mesh_network_notify_on_freed_pdu(&mesh_upper_transport_network_pdu_freed); 418 } 419 } 420 421 static void mesh_upper_transport_deliver_access_message(void) { 422 incoming_access_pdu_ready = false; 423 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t *) incoming_access_decrypted); 424 } 425 426 static bool mesh_upper_transport_send_requests_pending(void){ 427 if (incoming_access_pdu_ready) { 428 return true; 429 } 430 return btstack_linked_list_empty(&upper_transport_send_requests) == false; 431 } 432 433 static void mesh_upper_transport_schedule_send_requests(void){ 434 435 while (mesh_upper_transport_send_requests_pending()){ 436 437 // get ready 438 bool message_builder_ready = mesh_upper_transport_message_reserve(); 439 440 if (message_builder_ready == false){ 441 // waiting for free upper pdu, we will get called again on pdu free 442 if (message_builder_reserved_upper_pdu == false){ 443 return; 444 } 445 // request callback on network pdu free 446 mesh_upper_transport_need_pdu_for_send_requests(); 447 return; 448 } 449 450 // process send requests 451 452 // incoming access pdu 453 if (incoming_access_pdu_ready){ 454 // message builder ready = one outgoing pdu is guaranteed, deliver access pdu 455 mesh_upper_transport_deliver_access_message(); 456 continue; 457 } 458 459 // regular send request 460 btstack_context_callback_registration_t * send_request = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&upper_transport_send_requests); 461 btstack_assert(send_request != NULL); 462 (*send_request->callback)(send_request->context); 463 } 464 } 465 466 void mesh_upper_transport_request_to_send(btstack_context_callback_registration_t * request){ 467 btstack_linked_list_add_tail(&upper_transport_send_requests, (btstack_linked_item_t *) request); 468 mesh_upper_transport_schedule_send_requests(); 469 } 470 471 static void mesh_upper_transport_validate_access_message_ccm(void * arg){ 472 UNUSED(arg); 473 474 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 475 uint8_t * upper_transport_pdu = incoming_access_decrypted->data; 476 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 477 478 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 479 480 // store TransMIC 481 uint8_t trans_mic[8]; 482 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 483 mesh_print_hex("TransMIC", trans_mic, transmic_len); 484 485 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], transmic_len) == 0){ 486 printf("TransMIC matches\n"); 487 488 // remove TransMIC from payload 489 incoming_access_decrypted->len -= transmic_len; 490 491 // if virtual address, update dst to pseudo_dst 492 if (mesh_network_address_virtual(incoming_access_decrypted->dst)){ 493 incoming_access_decrypted->dst = mesh_transport_key_it.address->pseudo_dst; 494 } 495 496 // pass to upper layer 497 incoming_access_pdu_ready = true; 498 mesh_upper_transport_schedule_send_requests(); 499 500 } else { 501 uint8_t akf = incoming_access_decrypted->akf_aid_control & 0x40; 502 if (akf){ 503 printf("TransMIC does not match, try next key\n"); 504 mesh_upper_transport_validate_access_message(); 505 } else { 506 printf("TransMIC does not match device key, done\n"); 507 // done 508 mesh_upper_transport_process_access_message_done(incoming_access_decrypted); 509 } 510 } 511 } 512 513 static void mesh_upper_transport_validate_access_message_digest(void * arg){ 514 UNUSED(arg); 515 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 516 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 517 uint8_t * upper_transport_pdu_data_out = incoming_access_decrypted->data; 518 519 mesh_network_pdu_t * unsegmented_pdu = NULL; 520 mesh_segmented_pdu_t * segmented_pdu = NULL; 521 switch (incoming_access_encrypted->pdu_type){ 522 case MESH_PDU_TYPE_SEGMENTED: 523 segmented_pdu = (mesh_segmented_pdu_t *) incoming_access_encrypted; 524 mesh_segmented_pdu_flatten(&segmented_pdu->segments, 12, upper_transport_pdu_data_out); 525 mesh_print_hex("Encrypted Payload:", upper_transport_pdu_data_out, upper_transport_pdu_len); 526 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_out, upper_transport_pdu_data_out, 527 &mesh_upper_transport_validate_access_message_ccm, NULL); 528 break; 529 case MESH_PDU_TYPE_UNSEGMENTED: 530 unsegmented_pdu = (mesh_network_pdu_t *) incoming_access_encrypted; 531 (void)memcpy(upper_transport_pdu_data_out, &unsegmented_pdu->data[10], incoming_access_decrypted->len); 532 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_out, upper_transport_pdu_data_out, 533 &mesh_upper_transport_validate_access_message_ccm, NULL); 534 break; 535 default: 536 btstack_assert(false); 537 break; 538 } 539 540 } 541 542 static void mesh_upper_transport_validate_access_message(void){ 543 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 544 uint8_t * upper_transport_pdu_data = incoming_access_decrypted->data; 545 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 546 547 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 548 printf("No valid transport key found\n"); 549 mesh_upper_transport_process_access_message_done(incoming_access_decrypted); 550 return; 551 } 552 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 553 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 554 555 if (message_key->akf){ 556 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) incoming_access_decrypted); 557 } else { 558 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) incoming_access_decrypted); 559 } 560 561 // store application / device key index 562 mesh_print_hex("AppOrDevKey", message_key->key, 16); 563 incoming_access_decrypted->appkey_index = message_key->appkey_index; 564 565 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 566 567 // decrypt ccm 568 crypto_active = 1; 569 uint16_t aad_len = 0; 570 if (mesh_network_address_virtual(incoming_access_decrypted->dst)){ 571 aad_len = 16; 572 } 573 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, transmic_len); 574 575 if (aad_len){ 576 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, 577 &mesh_upper_transport_validate_access_message_digest, NULL); 578 } else { 579 mesh_upper_transport_validate_access_message_digest(NULL); 580 } 581 } 582 583 static void mesh_upper_transport_process_access_message(void){ 584 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 585 uint8_t * upper_transport_pdu = incoming_access_decrypted->data; 586 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 587 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 588 589 uint8_t aid = incoming_access_decrypted->akf_aid_control & 0x3f; 590 uint8_t akf = (incoming_access_decrypted->akf_aid_control & 0x40) >> 6; 591 592 printf("AKF: %u\n", akf); 593 printf("AID: %02x\n", aid); 594 595 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, incoming_access_decrypted->dst, 596 incoming_access_decrypted->netkey_index, akf, aid); 597 mesh_upper_transport_validate_access_message(); 598 } 599 600 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 601 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 602 mesh_upper_transport_run(); 603 } 604 605 static void mesh_upper_transport_send_access_segmented(mesh_upper_transport_pdu_t * upper_pdu){ 606 607 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 608 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 609 610 // convert mesh_access_pdu_t into mesh_segmented_pdu_t 611 btstack_linked_list_t free_segments = segmented_pdu->segments; 612 segmented_pdu->segments = NULL; 613 mesh_segmented_store_payload(incoming_pdu_singleton.access.data, upper_pdu->len, &free_segments, &segmented_pdu->segments); 614 615 // copy meta 616 segmented_pdu->len = upper_pdu->len; 617 segmented_pdu->netkey_index = upper_pdu->netkey_index; 618 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 619 segmented_pdu->flags = upper_pdu->flags; 620 621 // setup segmented_pdu header 622 // (void)memcpy(segmented_pdu->network_header, upper_pdu->network_header, 9); 623 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 624 segmented_pdu->ivi_nid = upper_pdu->ivi_nid; 625 segmented_pdu->ctl_ttl = upper_pdu->ctl_ttl; 626 segmented_pdu->seq = upper_pdu->seq; 627 segmented_pdu->src = upper_pdu->src; 628 segmented_pdu->dst = upper_pdu->dst; 629 630 // queue up 631 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 632 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 633 634 mesh_lower_transport_send_pdu((mesh_pdu_t*) segmented_pdu); 635 } 636 637 static void mesh_upper_transport_send_access_unsegmented(mesh_upper_transport_pdu_t * upper_pdu){ 638 639 // provide segment 640 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) upper_pdu->lower_pdu; 641 642 // setup network pdu 643 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS; 644 network_pdu->data[0] = upper_pdu->ivi_nid; 645 network_pdu->data[1] = upper_pdu->ctl_ttl; 646 big_endian_store_24(network_pdu->data, 2, upper_pdu->seq); 647 big_endian_store_16(network_pdu->data, 5, upper_pdu->src); 648 big_endian_store_16(network_pdu->data, 7, upper_pdu->dst); 649 network_pdu->netkey_index = upper_pdu->netkey_index; 650 651 // setup access message 652 network_pdu->data[9] = upper_pdu->akf_aid_control; 653 btstack_assert(upper_pdu->len < 15); 654 (void)memcpy(&network_pdu->data[10], &incoming_pdu_singleton.access.data, upper_pdu->len); 655 network_pdu->len = 10 + upper_pdu->len; 656 network_pdu->flags = 0; 657 658 // queue up 659 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 660 661 mesh_lower_transport_send_pdu((mesh_pdu_t*) network_pdu); 662 } 663 664 static void mesh_upper_transport_send_access_ccm(void * arg){ 665 crypto_active = 0; 666 667 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 668 mesh_print_hex("EncAccessPayload", incoming_pdu_singleton.access.data, upper_pdu->len); 669 // store TransMIC 670 btstack_crypto_ccm_get_authentication_value(&ccm, &incoming_pdu_singleton.access.data[upper_pdu->len]); 671 uint8_t transmic_len = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 672 mesh_print_hex("TransMIC", &incoming_pdu_singleton.access.data[upper_pdu->len], transmic_len); 673 upper_pdu->len += transmic_len; 674 mesh_print_hex("UpperTransportPDU", incoming_pdu_singleton.access.data, upper_pdu->len); 675 switch (upper_pdu->pdu_header.pdu_type){ 676 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 677 mesh_upper_transport_send_access_unsegmented(upper_pdu); 678 break; 679 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 680 mesh_upper_transport_send_access_segmented(upper_pdu); 681 break; 682 default: 683 btstack_assert(false); 684 } 685 } 686 687 static void mesh_upper_transport_send_access_digest(void *arg){ 688 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 689 uint16_t access_pdu_len = upper_pdu->len; 690 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, incoming_pdu_singleton.access.data, incoming_pdu_singleton.access.data, 691 &mesh_upper_transport_send_access_ccm, upper_pdu); 692 } 693 694 static void mesh_upper_transport_send_access(mesh_upper_transport_pdu_t * upper_pdu){ 695 696 // if dst is virtual address, lookup label uuid and hash 697 uint16_t aad_len = 0; 698 mesh_virtual_address_t * virtual_address = NULL; 699 if (mesh_network_address_virtual(upper_pdu->dst)){ 700 virtual_address = mesh_virtual_address_for_pseudo_dst(upper_pdu->dst); 701 if (!virtual_address){ 702 printf("No virtual address register for pseudo dst %4x\n", upper_pdu->dst); 703 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 704 return; 705 } 706 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 707 // printf_hexdump(virtual_address->label_uuid, 16); 708 aad_len = 16; 709 upper_pdu->dst = virtual_address->hash; 710 } 711 712 // get app or device key 713 uint16_t appkey_index = upper_pdu->appkey_index; 714 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(upper_pdu->netkey_index, appkey_index); 715 if (appkey == NULL){ 716 printf("AppKey %04x not found, drop message\n", appkey_index); 717 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 718 return; 719 } 720 721 // reserve slot 722 mesh_lower_transport_reserve_slot(); 723 724 // reserve one sequence number, which is also used to encrypt access payload 725 uint32_t seq = mesh_sequence_number_next(); 726 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 727 upper_pdu->seq = seq; 728 729 // also reserves crypto_buffer 730 crypto_active = 1; 731 732 // flatten segmented pdu into crypto buffer 733 uint16_t payload_len = mesh_upper_pdu_flatten(upper_pdu, incoming_pdu_singleton.access.data, sizeof(incoming_pdu_singleton.access.data)); 734 btstack_assert(payload_len == upper_pdu->len); 735 736 // Dump PDU 737 printf("[+] Upper transport, send upper (un)segmented Access PDU - dest %04x, seq %06x\n", upper_pdu->dst, upper_pdu->seq); 738 mesh_print_hex("Access Payload", incoming_pdu_singleton.access.data, upper_pdu->len); 739 740 // setup nonce - uses dst, so after pseudo address translation 741 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 742 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 743 } else { 744 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 745 } 746 747 // Dump key 748 mesh_print_hex("AppOrDevKey", appkey->key, 16); 749 750 // encrypt ccm 751 uint8_t transmic_len = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 752 uint16_t access_pdu_len = upper_pdu->len; 753 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 754 if (virtual_address){ 755 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 756 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, 757 &mesh_upper_transport_send_access_digest, upper_pdu); 758 } else { 759 mesh_upper_transport_send_access_digest(upper_pdu); 760 } 761 } 762 763 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 764 // reserve slot 765 mesh_lower_transport_reserve_slot(); 766 // reserve sequence number 767 uint32_t seq = mesh_sequence_number_next(); 768 mesh_network_pdu_set_seq(network_pdu, seq); 769 // Dump PDU 770 uint8_t opcode = network_pdu->data[9]; 771 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 772 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 773 774 // send 775 mesh_lower_transport_send_pdu((mesh_pdu_t *) network_pdu); 776 } 777 778 static void mesh_upper_transport_send_segmented_control_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 779 // reserve slot 780 mesh_lower_transport_reserve_slot(); 781 // reserve sequence number 782 uint32_t seq = mesh_sequence_number_next(); 783 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 784 upper_pdu->seq = seq; 785 // Dump PDU 786 // uint8_t opcode = upper_pdu->data[0]; 787 // printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", upper_pdu, seq, opcode); 788 // mesh_print_hex("Access Payload", &upper_pdu->data[1], upper_pdu->len - 1); 789 // send 790 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 791 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 792 793 // lend segments to lower transport pdu 794 segmented_pdu->segments = upper_pdu->segments; 795 upper_pdu->segments = NULL; 796 797 // copy meta 798 segmented_pdu->len = upper_pdu->len; 799 segmented_pdu->netkey_index = upper_pdu->netkey_index; 800 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 801 segmented_pdu->flags = upper_pdu->flags; 802 803 btstack_assert((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) == 0); 804 805 // setup segmented_pdu header 806 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 807 segmented_pdu->ivi_nid = upper_pdu->ivi_nid; 808 segmented_pdu->ctl_ttl = upper_pdu->ctl_ttl; 809 segmented_pdu->seq = upper_pdu->seq; 810 segmented_pdu->src = upper_pdu->src; 811 segmented_pdu->dst = upper_pdu->dst; 812 813 // queue up 814 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 815 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 816 817 mesh_lower_transport_send_pdu((mesh_pdu_t *) segmented_pdu); 818 } 819 820 static void mesh_upper_transport_run(void){ 821 822 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 823 824 if (crypto_active) return; 825 826 // get next message 827 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(&upper_transport_incoming); 828 mesh_network_pdu_t * network_pdu; 829 mesh_segmented_pdu_t * segmented_pdu; 830 switch (pdu->pdu_type){ 831 case MESH_PDU_TYPE_UNSEGMENTED: 832 network_pdu = (mesh_network_pdu_t *) pdu; 833 // control? 834 if (mesh_network_control(network_pdu)) { 835 836 incoming_control_pdu = &incoming_pdu_singleton.control; 837 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 838 incoming_control_pdu->len = network_pdu->len; 839 incoming_control_pdu->netkey_index = network_pdu->netkey_index; 840 841 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 842 843 incoming_control_pdu->akf_aid_control = lower_transport_pdu[0]; 844 incoming_control_pdu->len = network_pdu->len - 10; // 9 header + 1 opcode 845 (void)memcpy(incoming_control_pdu->data, &lower_transport_pdu[1], incoming_control_pdu->len); 846 847 // copy meta data into encrypted pdu buffer 848 incoming_control_pdu->ivi_nid = network_pdu->data[0]; 849 incoming_control_pdu->ctl_ttl = network_pdu->data[1]; 850 incoming_control_pdu->seq = big_endian_read_24(network_pdu->data, 2); 851 incoming_control_pdu->src = big_endian_read_16(network_pdu->data, 5); 852 incoming_control_pdu->dst = big_endian_read_16(network_pdu->data, 7); 853 854 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 855 856 // free mesh message 857 mesh_lower_transport_message_processed_by_higher_layer(pdu); 858 859 btstack_assert(mesh_control_message_handler != NULL); 860 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t*) incoming_control_pdu); 861 862 } else { 863 864 incoming_access_encrypted = (mesh_pdu_t *) network_pdu; 865 866 incoming_access_decrypted = &incoming_pdu_singleton.access; 867 incoming_access_decrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 868 incoming_access_decrypted->flags = 0; 869 incoming_access_decrypted->netkey_index = network_pdu->netkey_index; 870 incoming_access_decrypted->akf_aid_control = network_pdu->data[9]; 871 incoming_access_decrypted->len = network_pdu->len - 10; // 9 header + 1 AID 872 incoming_access_decrypted->ivi_nid = network_pdu->data[0]; 873 incoming_access_decrypted->ctl_ttl = network_pdu->data[1]; 874 incoming_access_decrypted->seq = big_endian_read_24(network_pdu->data, 2); 875 incoming_access_decrypted->src = big_endian_read_16(network_pdu->data, 5); 876 incoming_access_decrypted->dst = big_endian_read_16(network_pdu->data, 7); 877 878 mesh_upper_transport_process_access_message(); 879 } 880 break; 881 case MESH_PDU_TYPE_SEGMENTED: 882 segmented_pdu = (mesh_segmented_pdu_t *) pdu; 883 uint8_t ctl = segmented_pdu->ctl_ttl >> 7; 884 if (ctl){ 885 incoming_control_pdu= &incoming_pdu_singleton.control; 886 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 887 888 // flatten 889 mesh_segmented_pdu_flatten(&segmented_pdu->segments, 8, incoming_control_pdu->data); 890 891 // copy meta data into encrypted pdu buffer 892 incoming_control_pdu->flags = 0; 893 incoming_control_pdu->len = segmented_pdu->len; 894 incoming_control_pdu->netkey_index = segmented_pdu->netkey_index; 895 incoming_control_pdu->akf_aid_control = segmented_pdu->akf_aid_control; 896 incoming_control_pdu->ivi_nid = segmented_pdu->ivi_nid; 897 incoming_control_pdu->ctl_ttl = segmented_pdu->ctl_ttl; 898 incoming_control_pdu->seq = segmented_pdu->seq; 899 incoming_control_pdu->src = segmented_pdu->src; 900 incoming_control_pdu->dst = segmented_pdu->dst; 901 902 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 903 904 // free mesh message 905 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)segmented_pdu); 906 907 btstack_assert(mesh_control_message_handler != NULL); 908 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t*) incoming_control_pdu); 909 910 } else { 911 912 incoming_access_encrypted = (mesh_pdu_t *) segmented_pdu; 913 914 incoming_access_decrypted = &incoming_pdu_singleton.access; 915 incoming_access_decrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 916 incoming_access_decrypted->flags = segmented_pdu->flags; 917 incoming_access_decrypted->len = segmented_pdu->len; 918 incoming_access_decrypted->netkey_index = segmented_pdu->netkey_index; 919 incoming_access_decrypted->akf_aid_control = segmented_pdu->akf_aid_control; 920 incoming_access_decrypted->ivi_nid = segmented_pdu->ivi_nid; 921 incoming_access_decrypted->ctl_ttl = segmented_pdu->ctl_ttl; 922 incoming_access_decrypted->seq = segmented_pdu->seq; 923 incoming_access_decrypted->src = segmented_pdu->src; 924 incoming_access_decrypted->dst = segmented_pdu->dst; 925 926 mesh_upper_transport_process_access_message(); 927 } 928 break; 929 default: 930 btstack_assert(0); 931 break; 932 } 933 } 934 935 btstack_linked_list_iterator_t it; 936 btstack_linked_list_iterator_init(&it, &upper_transport_outgoing); 937 while (btstack_linked_list_iterator_has_next(&it)){ 938 939 if (crypto_active) break; 940 941 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_iterator_next(&it); 942 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == false) { 943 // skip pdu for now 944 continue; 945 } 946 947 mesh_upper_transport_pdu_t * upper_pdu; 948 mesh_segmented_pdu_t * segmented_pdu; 949 uint8_t transmic_len; 950 bool ok; 951 bool abort_outgoing_loop = false; 952 953 switch (pdu->pdu_type){ 954 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 955 // control pdus can go through directly 956 btstack_assert(mesh_pdu_ctl(pdu) != 0); 957 btstack_linked_list_iterator_remove(&it); 958 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 959 break; 960 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 961 // control pdus can go through directly 962 btstack_assert(mesh_pdu_ctl(pdu) != 0); 963 btstack_linked_list_iterator_remove(&it); 964 mesh_upper_transport_send_segmented_control_pdu((mesh_upper_transport_pdu_t *) pdu); 965 break; 966 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 967 // segmented access pdus required a mesh-segmented-pdu 968 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 969 if (upper_pdu->lower_pdu == NULL){ 970 upper_pdu->lower_pdu = (mesh_pdu_t *) btstack_memory_mesh_segmented_pdu_get(); 971 } 972 if (upper_pdu->lower_pdu == NULL){ 973 mesh_upper_transport_need_pdu_for_run_outgoing(); 974 abort_outgoing_loop = true; 975 break; 976 } 977 segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 978 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 979 // and a mesh-network-pdu for each segment in upper pdu 980 transmic_len = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 981 ok = mesh_segmented_allocate_segments(&segmented_pdu->segments, upper_pdu->len + transmic_len); 982 if (!ok) { 983 abort_outgoing_loop = true; 984 break; 985 } 986 // all buffers available, get started 987 btstack_linked_list_iterator_remove(&it); 988 mesh_upper_transport_send_access(upper_pdu); 989 break; 990 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 991 // unsegmented access pdus require a single mesh-network-dpu 992 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 993 if (upper_pdu->lower_pdu == NULL){ 994 upper_pdu->lower_pdu = (mesh_pdu_t *) mesh_network_pdu_get(); 995 } 996 if (upper_pdu->lower_pdu == NULL) { 997 mesh_upper_transport_need_pdu_for_run_outgoing(); 998 abort_outgoing_loop = true; 999 break; 1000 } 1001 btstack_linked_list_iterator_remove(&it); 1002 mesh_upper_transport_send_access((mesh_upper_transport_pdu_t *) pdu); 1003 break; 1004 default: 1005 btstack_assert(false); 1006 break; 1007 } 1008 if (abort_outgoing_loop) { 1009 break; 1010 } 1011 } 1012 } 1013 1014 static mesh_upper_transport_pdu_t * mesh_upper_transport_find_and_remove_pdu_for_lower(mesh_pdu_t * pdu_to_find){ 1015 btstack_linked_list_iterator_t it; 1016 btstack_linked_list_iterator_init(&it, &upper_transport_outgoing_active); 1017 mesh_upper_transport_pdu_t * upper_pdu; 1018 while (btstack_linked_list_iterator_has_next(&it)){ 1019 mesh_pdu_t * mesh_pdu = (mesh_pdu_t *) btstack_linked_list_iterator_next(&it); 1020 switch (mesh_pdu->pdu_type){ 1021 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1022 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1023 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1024 upper_pdu = (mesh_upper_transport_pdu_t *) mesh_pdu; 1025 if (upper_pdu->lower_pdu == pdu_to_find){ 1026 btstack_linked_list_iterator_remove(&it); 1027 return upper_pdu; 1028 } 1029 break; 1030 default: 1031 break; 1032 } 1033 } 1034 return NULL; 1035 } 1036 1037 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 1038 mesh_upper_transport_pdu_t * upper_pdu; 1039 mesh_segmented_pdu_t * segmented_pdu; 1040 switch (callback_type){ 1041 case MESH_TRANSPORT_PDU_RECEIVED: 1042 mesh_upper_transport_message_received(pdu); 1043 break; 1044 case MESH_TRANSPORT_PDU_SENT: 1045 switch (pdu->pdu_type){ 1046 case MESH_PDU_TYPE_SEGMENTED: 1047 // try to find in outgoing active 1048 upper_pdu = mesh_upper_transport_find_and_remove_pdu_for_lower(pdu); 1049 btstack_assert(upper_pdu != NULL); 1050 segmented_pdu = (mesh_segmented_pdu_t *) pdu; 1051 // free chunks 1052 while (!btstack_linked_list_empty(&segmented_pdu->segments)){ 1053 mesh_network_pdu_t * chunk_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&segmented_pdu->segments); 1054 mesh_network_pdu_free(chunk_pdu); 1055 } 1056 // free segmented pdu 1057 btstack_memory_mesh_segmented_pdu_free(segmented_pdu); 1058 upper_pdu->lower_pdu = NULL; 1059 switch (upper_pdu->pdu_header.pdu_type){ 1060 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1061 mesh_control_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 1062 break; 1063 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1064 mesh_access_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 1065 break; 1066 default: 1067 btstack_assert(false); 1068 break; 1069 } 1070 break; 1071 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1072 // find corresponding upper transport pdu and free single segment 1073 upper_pdu = mesh_upper_transport_find_and_remove_pdu_for_lower(pdu); 1074 btstack_assert(upper_pdu != NULL); 1075 btstack_assert(upper_pdu->lower_pdu == (mesh_pdu_t *) pdu); 1076 mesh_network_pdu_free((mesh_network_pdu_t *) pdu); 1077 upper_pdu->lower_pdu = NULL; 1078 mesh_access_message_handler(callback_type, status, (mesh_pdu_t*) upper_pdu); 1079 break; 1080 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1081 mesh_access_message_handler(callback_type, status, pdu); 1082 break; 1083 default: 1084 btstack_assert(false); 1085 break; 1086 } 1087 mesh_upper_transport_run(); 1088 break; 1089 default: 1090 break; 1091 } 1092 } 1093 1094 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 1095 btstack_assert(pdu != NULL); 1096 mesh_network_pdu_t * network_pdu; 1097 mesh_segmented_pdu_t * message_pdu; 1098 mesh_upper_transport_pdu_t * upper_pdu; 1099 switch (pdu->pdu_type) { 1100 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1101 case MESH_PDU_TYPE_NETWORK: 1102 network_pdu = (mesh_network_pdu_t *) pdu; 1103 mesh_network_pdu_free(network_pdu); 1104 break; 1105 case MESH_PDU_TYPE_SEGMENTED: 1106 message_pdu = (mesh_segmented_pdu_t *) pdu; 1107 mesh_segmented_pdu_free(message_pdu); 1108 break; 1109 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1110 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1111 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1112 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 1113 while (upper_pdu->segments) { 1114 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_pop(&upper_pdu->segments); 1115 mesh_network_pdu_free(segment); 1116 } 1117 btstack_memory_mesh_upper_transport_pdu_free(upper_pdu); 1118 // check if send request can be handled now 1119 mesh_upper_transport_schedule_send_requests(); 1120 break; 1121 default: 1122 btstack_assert(false); 1123 break; 1124 } 1125 } 1126 1127 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 1128 crypto_active = 0; 1129 switch (pdu->pdu_type){ 1130 case MESH_PDU_TYPE_ACCESS: 1131 mesh_upper_transport_process_access_message_done((mesh_access_pdu_t *) pdu); 1132 case MESH_PDU_TYPE_CONTROL: 1133 mesh_upper_transport_process_control_message_done((mesh_control_pdu_t *) pdu); 1134 break; 1135 default: 1136 btstack_assert(0); 1137 break; 1138 } 1139 } 1140 1141 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 1142 switch (pdu->pdu_type){ 1143 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1144 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1145 break; 1146 default: 1147 btstack_assert(false); 1148 break; 1149 } 1150 1151 btstack_assert(((mesh_upper_transport_pdu_t *) pdu)->lower_pdu == NULL); 1152 1153 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1154 mesh_upper_transport_run(); 1155 } 1156 1157 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 1158 switch (pdu->pdu_type){ 1159 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1160 break; 1161 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1162 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 1163 break; 1164 default: 1165 btstack_assert(false); 1166 break; 1167 } 1168 1169 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1170 mesh_upper_transport_run(); 1171 } 1172 1173 uint8_t mesh_upper_transport_setup_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, 1174 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1175 1176 btstack_assert(network_pdu != NULL); 1177 btstack_assert(control_pdu_len <= 11); 1178 1179 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1180 if (!network_key) return 1; 1181 1182 uint8_t transport_pdu_data[12]; 1183 transport_pdu_data[0] = opcode; 1184 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 1185 uint16_t transport_pdu_len = control_pdu_len + 1; 1186 1187 // setup network_pdu 1188 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL; 1189 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 1190 1191 return 0; 1192 } 1193 1194 uint8_t mesh_upper_transport_setup_segmented_control_pdu_header(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode){ 1195 1196 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1197 if (!network_key) return 1; 1198 1199 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1200 upper_pdu->ctl_ttl = ttl; 1201 upper_pdu->src = src; 1202 upper_pdu->dst = dest; 1203 upper_pdu->netkey_index = netkey_index; 1204 upper_pdu->akf_aid_control = opcode; 1205 return 0; 1206 } 1207 1208 static uint8_t mesh_upper_transport_setup_upper_access_pdu_header(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, 1209 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1210 1211 // get app or device key 1212 const mesh_transport_key_t *appkey; 1213 appkey = mesh_transport_key_get(appkey_index); 1214 if (appkey == NULL) { 1215 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 1216 return 1; 1217 } 1218 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1219 1220 // lookup network by netkey_index 1221 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 1222 if (!network_key) return 1; 1223 if (network_key == NULL) { 1224 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 1225 return 1; 1226 } 1227 1228 // store in transport pdu 1229 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1230 upper_pdu->ctl_ttl = ttl; 1231 upper_pdu->src = src; 1232 upper_pdu->dst = dest; 1233 upper_pdu->netkey_index = netkey_index; 1234 upper_pdu->appkey_index = appkey_index; 1235 upper_pdu->akf_aid_control = akf_aid; 1236 if (szmic) { 1237 upper_pdu->flags |= MESH_TRANSPORT_FLAG_TRANSMIC_64; 1238 } 1239 return 0; 1240 } 1241 1242 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 1243 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1244 switch (pdu->pdu_type){ 1245 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1246 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1247 return mesh_upper_transport_setup_upper_access_pdu_header((mesh_upper_transport_pdu_t *) pdu, netkey_index, 1248 appkey_index, ttl, src, dest, szmic); 1249 default: 1250 btstack_assert(false); 1251 return 1; 1252 } 1253 } 1254 1255 void mesh_upper_transport_register_access_message_handler(void (*callback)(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu)) { 1256 mesh_access_message_handler = callback; 1257 } 1258 1259 void mesh_upper_transport_register_control_message_handler(void (*callback)(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu)){ 1260 mesh_control_message_handler = callback; 1261 } 1262 1263 void mesh_upper_transport_init(){ 1264 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1265 } 1266 1267 bool mesh_upper_transport_message_reserve(void){ 1268 if (message_builder_reserved_upper_pdu == NULL){ 1269 message_builder_reserved_upper_pdu = btstack_memory_mesh_upper_transport_pdu_get(); 1270 } 1271 if (message_builder_reserved_upper_pdu == NULL){ 1272 return false; 1273 } 1274 while (message_builder_num_network_pdus_reserved < MESSAGE_BUILDER_MAX_NUM_NETWORK_PDUS){ 1275 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 1276 if (network_pdu == NULL){ 1277 return false; 1278 } 1279 btstack_linked_list_add(&message_builder_reserved_network_pdus, (btstack_linked_item_t *) network_pdu); 1280 message_builder_num_network_pdus_reserved++; 1281 } 1282 return true; 1283 } 1284 1285 void mesh_upper_transport_message_init(mesh_upper_transport_builder_t * builder, mesh_pdu_type_t pdu_type) { 1286 btstack_assert(builder != NULL); 1287 1288 // use reserved buffer if available 1289 if (message_builder_reserved_upper_pdu != NULL){ 1290 builder->pdu = message_builder_reserved_upper_pdu; 1291 message_builder_reserved_upper_pdu = NULL; 1292 } else { 1293 builder->pdu = btstack_memory_mesh_upper_transport_pdu_get(); 1294 } 1295 if (!builder->pdu) return; 1296 1297 builder->segment = NULL; 1298 builder->pdu->pdu_header.pdu_type = pdu_type; 1299 builder->pdu->ack_opcode = MESH_ACCESS_OPCODE_NOT_SET; 1300 } 1301 1302 1303 void mesh_upper_transport_message_add_data(mesh_upper_transport_builder_t * builder, const uint8_t * data, uint16_t data_len){ 1304 btstack_assert(builder != NULL); 1305 1306 if (builder->pdu == NULL) return; 1307 1308 builder->pdu->len += data_len; 1309 1310 uint16_t bytes_current_segment = 0; 1311 if (builder->segment){ 1312 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX - builder->segment->len; 1313 } 1314 while (data_len > 0){ 1315 if (bytes_current_segment == 0){ 1316 // use reserved buffer if available 1317 if (message_builder_num_network_pdus_reserved > 0){ 1318 message_builder_num_network_pdus_reserved--; 1319 builder->segment = (mesh_network_pdu_t *) btstack_linked_list_pop(&message_builder_reserved_network_pdus); 1320 } else { 1321 builder->segment = (mesh_network_pdu_t *) mesh_network_pdu_get(); 1322 } 1323 if (builder->segment == NULL) { 1324 mesh_upper_transport_pdu_free((mesh_pdu_t *) builder->pdu); 1325 builder->pdu = NULL; 1326 return; 1327 } 1328 btstack_linked_list_add_tail(&builder->pdu->segments, (btstack_linked_item_t *) builder->segment); 1329 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX; 1330 } 1331 uint16_t bytes_to_copy = btstack_min(bytes_current_segment, data_len); 1332 (void) memcpy(&builder->segment->data[builder->segment->len], data, bytes_to_copy); 1333 builder->segment->len += bytes_to_copy; 1334 bytes_current_segment -= bytes_to_copy; 1335 data += bytes_to_copy; 1336 data_len -= bytes_to_copy; 1337 } 1338 } 1339 1340 void mesh_upper_transport_message_add_uint8(mesh_upper_transport_builder_t * builder, uint8_t value){ 1341 mesh_upper_transport_message_add_data(builder, &value, 1); 1342 } 1343 1344 void mesh_upper_transport_message_add_uint16(mesh_upper_transport_builder_t * builder, uint16_t value){ 1345 uint8_t buffer[2]; 1346 little_endian_store_16(buffer, 0, value); 1347 mesh_upper_transport_message_add_data(builder, buffer, sizeof(buffer)); 1348 } 1349 1350 void mesh_upper_transport_message_add_uint24(mesh_upper_transport_builder_t * builder, uint32_t value){ 1351 uint8_t buffer[3]; 1352 little_endian_store_24(buffer, 0, value); 1353 mesh_upper_transport_message_add_data(builder, buffer, sizeof(buffer)); 1354 } 1355 1356 void mesh_upper_transport_message_add_uint32(mesh_upper_transport_builder_t * builder, uint32_t value){ 1357 uint8_t buffer[4]; 1358 little_endian_store_32(buffer, 0, value); 1359 mesh_upper_transport_message_add_data(builder, buffer, sizeof(buffer)); 1360 } 1361 1362 mesh_upper_transport_pdu_t * mesh_upper_transport_message_finalize(mesh_upper_transport_builder_t * builder){ 1363 return builder->pdu; 1364 } 1365