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; 244 245 // on enter, bytes_current_segment = 0 => network_pdu = pop (in segements) + assert (network != NULL) 246 // cppcheck-suppress nullPointer 247 network_pdu->len += bytes_to_copy; 248 payload_offset += bytes_to_copy; 249 } 250 } 251 252 // tries allocate and add enough segments to store payload of given size 253 static bool mesh_segmented_allocate_segments(btstack_linked_list_t * segments, uint16_t payload_len){ 254 uint16_t storage_size = btstack_linked_list_count(segments) * MESH_NETWORK_PAYLOAD_MAX; 255 while (storage_size < payload_len){ 256 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 257 if (network_pdu == NULL) break; 258 storage_size += MESH_NETWORK_PAYLOAD_MAX; 259 btstack_linked_list_add(segments, (btstack_linked_item_t *) network_pdu); 260 } 261 return (storage_size >= payload_len); 262 } 263 264 // stub lower transport 265 266 static void mesh_upper_transport_dump_pdus(const char *name, btstack_linked_list_t *list){ 267 printf("List: %s:\n", name); 268 btstack_linked_list_iterator_t it; 269 btstack_linked_list_iterator_init(&it, list); 270 while (btstack_linked_list_iterator_has_next(&it)){ 271 mesh_pdu_t * pdu = (mesh_pdu_t*) btstack_linked_list_iterator_next(&it); 272 printf("- %p\n", pdu); 273 // printf_hexdump( mesh_pdu_data(pdu), mesh_pdu_len(pdu)); 274 } 275 } 276 277 static void mesh_upper_transport_reset_pdus(btstack_linked_list_t *list){ 278 while (!btstack_linked_list_empty(list)){ 279 mesh_upper_transport_pdu_free((mesh_pdu_t *) btstack_linked_list_pop(list)); 280 } 281 } 282 283 void mesh_upper_transport_dump(void){ 284 mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); 285 } 286 287 void mesh_upper_transport_reset(void){ 288 crypto_active = 0; 289 mesh_upper_transport_reset_pdus(&upper_transport_incoming); 290 mesh_upper_transport_reset_pdus(&upper_transport_outgoing); 291 message_builder_num_network_pdus_reserved = 0; 292 mesh_upper_transport_reset_pdus(&message_builder_reserved_network_pdus); 293 if (message_builder_reserved_upper_pdu != NULL){ 294 btstack_memory_mesh_upper_transport_pdu_free(message_builder_reserved_upper_pdu); 295 message_builder_reserved_upper_pdu = NULL; 296 } 297 } 298 299 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 300 // Device Key is fixed 301 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 302 return mesh_transport_key_get(appkey_index); 303 } 304 305 // Get key refresh state from subnet 306 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 307 if (subnet == NULL) return NULL; 308 309 // identify old and new app keys for given appkey_index 310 mesh_transport_key_t * old_key = NULL; 311 mesh_transport_key_t * new_key = NULL; 312 mesh_transport_key_iterator_t it; 313 mesh_transport_key_iterator_init(&it, netkey_index); 314 while (mesh_transport_key_iterator_has_more(&it)){ 315 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 316 if (transport_key->appkey_index != appkey_index) continue; 317 if (transport_key->old_key == 0) { 318 new_key = transport_key; 319 } else { 320 old_key = transport_key; 321 } 322 } 323 324 // if no key is marked as old, just use the current one 325 if (old_key == NULL) return new_key; 326 327 // use new key if it exists in phase two 328 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 329 return new_key; 330 } else { 331 return old_key; 332 } 333 } 334 335 static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ 336 // get IV Index and IVI 337 uint32_t iv_index = mesh_get_iv_index(); 338 int ivi = ivi_nid >> 7; 339 340 // if least significant bit differs, use previous IV Index 341 if ((iv_index & 1 ) ^ ivi){ 342 iv_index--; 343 } 344 return iv_index; 345 } 346 347 static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 348 mesh_access_pdu_t * access_pdu; 349 mesh_upper_transport_pdu_t * upper_pdu; 350 switch (pdu->pdu_type){ 351 case MESH_PDU_TYPE_ACCESS: 352 access_pdu = (mesh_access_pdu_t *) pdu; 353 nonce[1] = ((access_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 0x80 : 0x00; 354 big_endian_store_24(nonce, 2, access_pdu->seq); 355 big_endian_store_16(nonce, 5, access_pdu->src); 356 big_endian_store_16(nonce, 7, access_pdu->dst); 357 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(access_pdu->ivi_nid)); 358 break; 359 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 360 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 361 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 362 nonce[1] = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 0x80 : 0x00; 363 // 'network header' 364 big_endian_store_24(nonce, 2, upper_pdu->seq); 365 big_endian_store_16(nonce, 5, upper_pdu->src); 366 big_endian_store_16(nonce, 7, upper_pdu->dst); 367 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(upper_pdu->ivi_nid)); 368 break; 369 default: 370 btstack_assert(0); 371 break; 372 } 373 } 374 375 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 376 nonce[0] = 0x01; 377 transport_segmented_setup_nonce(nonce, pdu); 378 mesh_print_hex("AppNonce", nonce, 13); 379 } 380 381 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 382 nonce[0] = 0x02; 383 transport_segmented_setup_nonce(nonce, pdu); 384 mesh_print_hex("DeviceNonce", nonce, 13); 385 } 386 387 static void mesh_upper_transport_process_access_message_done(mesh_access_pdu_t *access_pdu){ 388 crypto_active = 0; 389 btstack_assert((access_pdu->ctl_ttl & 0x80) == 0); 390 mesh_lower_transport_message_processed_by_higher_layer(incoming_access_encrypted); 391 incoming_access_encrypted = NULL; 392 incoming_access_decrypted = NULL; 393 mesh_upper_transport_run(); 394 } 395 396 static void mesh_upper_transport_process_control_message_done(mesh_control_pdu_t * control_pdu){ 397 UNUSED(control_pdu); 398 crypto_active = 0; 399 incoming_control_pdu = NULL; 400 mesh_upper_transport_run(); 401 } 402 403 static void mesh_upper_transport_network_pdu_freed(void){ 404 // call both while prioritizing run outgoing 405 // both functions will trigger request for network pdu if needed 406 if (upper_transport_need_pdu_for_run_outgoing){ 407 upper_transport_need_pdu_for_run_outgoing = false; 408 mesh_upper_transport_run(); 409 } 410 if (upper_transport_need_pdu_for_send_requests){ 411 upper_transport_need_pdu_for_send_requests = false; 412 mesh_upper_transport_schedule_send_requests(); 413 } 414 } 415 416 static void mesh_upper_transport_need_pdu_for_send_requests(void) { 417 bool waiting = upper_transport_need_pdu_for_send_requests || upper_transport_need_pdu_for_run_outgoing; 418 upper_transport_need_pdu_for_send_requests = true; 419 if (waiting == false) { 420 mesh_network_notify_on_freed_pdu(&mesh_upper_transport_network_pdu_freed); 421 } 422 } 423 static void mesh_upper_transport_need_pdu_for_run_outgoing(void) { 424 bool waiting = upper_transport_need_pdu_for_send_requests || upper_transport_need_pdu_for_run_outgoing; 425 upper_transport_need_pdu_for_run_outgoing = true; 426 if (waiting == false) { 427 mesh_network_notify_on_freed_pdu(&mesh_upper_transport_network_pdu_freed); 428 } 429 } 430 431 static void mesh_upper_transport_deliver_access_message(void) { 432 incoming_access_pdu_ready = false; 433 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t *) incoming_access_decrypted); 434 } 435 436 static bool mesh_upper_transport_send_requests_pending(void){ 437 if (incoming_access_pdu_ready) { 438 return true; 439 } 440 return btstack_linked_list_empty(&upper_transport_send_requests) == false; 441 } 442 443 static void mesh_upper_transport_schedule_send_requests(void){ 444 445 while (mesh_upper_transport_send_requests_pending()){ 446 447 // get ready 448 bool message_builder_ready = mesh_upper_transport_message_reserve(); 449 450 if (message_builder_ready == false){ 451 // waiting for free upper pdu, we will get called again on pdu free 452 if (message_builder_reserved_upper_pdu == NULL){ 453 return; 454 } 455 // request callback on network pdu free 456 mesh_upper_transport_need_pdu_for_send_requests(); 457 return; 458 } 459 460 // process send requests 461 462 // incoming access pdu 463 if (incoming_access_pdu_ready){ 464 // message builder ready = one outgoing pdu is guaranteed, deliver access pdu 465 mesh_upper_transport_deliver_access_message(); 466 continue; 467 } 468 469 // regular send request 470 btstack_context_callback_registration_t * send_request = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&upper_transport_send_requests); 471 btstack_assert(send_request != NULL); 472 (*send_request->callback)(send_request->context); 473 } 474 } 475 476 void mesh_upper_transport_request_to_send(btstack_context_callback_registration_t * request){ 477 btstack_linked_list_add_tail(&upper_transport_send_requests, (btstack_linked_item_t *) request); 478 mesh_upper_transport_schedule_send_requests(); 479 } 480 481 static void mesh_upper_transport_validate_access_message_ccm(void * arg){ 482 UNUSED(arg); 483 484 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 485 uint8_t * upper_transport_pdu = incoming_access_decrypted->data; 486 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 487 488 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 489 490 // store TransMIC 491 uint8_t trans_mic[8]; 492 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 493 mesh_print_hex("TransMIC", trans_mic, transmic_len); 494 495 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], transmic_len) == 0){ 496 printf("TransMIC matches\n"); 497 498 // remove TransMIC from payload 499 incoming_access_decrypted->len -= transmic_len; 500 501 // if virtual address, update dst to pseudo_dst 502 if (mesh_network_address_virtual(incoming_access_decrypted->dst)){ 503 incoming_access_decrypted->dst = mesh_transport_key_it.address->pseudo_dst; 504 } 505 506 // pass to upper layer 507 incoming_access_pdu_ready = true; 508 mesh_upper_transport_schedule_send_requests(); 509 510 } else { 511 uint8_t akf = incoming_access_decrypted->akf_aid_control & 0x40; 512 if (akf){ 513 printf("TransMIC does not match, try next key\n"); 514 mesh_upper_transport_validate_access_message(); 515 } else { 516 printf("TransMIC does not match device key, done\n"); 517 // done 518 mesh_upper_transport_process_access_message_done(incoming_access_decrypted); 519 } 520 } 521 } 522 523 static void mesh_upper_transport_validate_access_message_digest(void * arg){ 524 UNUSED(arg); 525 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 526 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 527 uint8_t * upper_transport_pdu_data_out = incoming_access_decrypted->data; 528 529 mesh_network_pdu_t * unsegmented_pdu = NULL; 530 mesh_segmented_pdu_t * segmented_pdu = NULL; 531 switch (incoming_access_encrypted->pdu_type){ 532 case MESH_PDU_TYPE_SEGMENTED: 533 segmented_pdu = (mesh_segmented_pdu_t *) incoming_access_encrypted; 534 mesh_segmented_pdu_flatten(&segmented_pdu->segments, 12, upper_transport_pdu_data_out); 535 mesh_print_hex("Encrypted Payload:", upper_transport_pdu_data_out, upper_transport_pdu_len); 536 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_out, upper_transport_pdu_data_out, 537 &mesh_upper_transport_validate_access_message_ccm, NULL); 538 break; 539 case MESH_PDU_TYPE_UNSEGMENTED: 540 unsegmented_pdu = (mesh_network_pdu_t *) incoming_access_encrypted; 541 (void)memcpy(upper_transport_pdu_data_out, &unsegmented_pdu->data[10], incoming_access_decrypted->len); 542 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_out, upper_transport_pdu_data_out, 543 &mesh_upper_transport_validate_access_message_ccm, NULL); 544 break; 545 default: 546 btstack_assert(false); 547 break; 548 } 549 550 } 551 552 static void mesh_upper_transport_validate_access_message(void){ 553 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 554 uint8_t * upper_transport_pdu_data = incoming_access_decrypted->data; 555 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 556 557 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 558 printf("No valid transport key found\n"); 559 mesh_upper_transport_process_access_message_done(incoming_access_decrypted); 560 return; 561 } 562 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 563 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 564 565 if (message_key->akf){ 566 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) incoming_access_decrypted); 567 } else { 568 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) incoming_access_decrypted); 569 } 570 571 // store application / device key index 572 mesh_print_hex("AppOrDevKey", message_key->key, 16); 573 incoming_access_decrypted->appkey_index = message_key->appkey_index; 574 575 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 576 577 // decrypt ccm 578 crypto_active = 1; 579 uint16_t aad_len = 0; 580 if (mesh_network_address_virtual(incoming_access_decrypted->dst)){ 581 aad_len = 16; 582 } 583 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, transmic_len); 584 585 if (aad_len){ 586 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, 587 &mesh_upper_transport_validate_access_message_digest, NULL); 588 } else { 589 mesh_upper_transport_validate_access_message_digest(NULL); 590 } 591 } 592 593 static void mesh_upper_transport_process_access_message(void){ 594 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 595 uint8_t * upper_transport_pdu = incoming_access_decrypted->data; 596 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 597 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 598 599 uint8_t aid = incoming_access_decrypted->akf_aid_control & 0x3f; 600 uint8_t akf = (incoming_access_decrypted->akf_aid_control & 0x40) >> 6; 601 602 printf("AKF: %u\n", akf); 603 printf("AID: %02x\n", aid); 604 605 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, incoming_access_decrypted->dst, 606 incoming_access_decrypted->netkey_index, akf, aid); 607 mesh_upper_transport_validate_access_message(); 608 } 609 610 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 611 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 612 mesh_upper_transport_run(); 613 } 614 615 static void mesh_upper_transport_send_access_segmented(mesh_upper_transport_pdu_t * upper_pdu){ 616 617 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 618 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 619 620 // convert mesh_access_pdu_t into mesh_segmented_pdu_t 621 btstack_linked_list_t free_segments = segmented_pdu->segments; 622 segmented_pdu->segments = NULL; 623 mesh_segmented_store_payload(incoming_pdu_singleton.access.data, upper_pdu->len, &free_segments, &segmented_pdu->segments); 624 625 // copy meta 626 segmented_pdu->len = upper_pdu->len; 627 segmented_pdu->netkey_index = upper_pdu->netkey_index; 628 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 629 segmented_pdu->flags = upper_pdu->flags; 630 631 // setup segmented_pdu header 632 // (void)memcpy(segmented_pdu->network_header, upper_pdu->network_header, 9); 633 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 634 segmented_pdu->ivi_nid = upper_pdu->ivi_nid; 635 segmented_pdu->ctl_ttl = upper_pdu->ctl_ttl; 636 segmented_pdu->seq = upper_pdu->seq; 637 segmented_pdu->src = upper_pdu->src; 638 segmented_pdu->dst = upper_pdu->dst; 639 640 // queue up 641 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 642 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 643 644 mesh_lower_transport_send_pdu((mesh_pdu_t*) segmented_pdu); 645 } 646 647 static void mesh_upper_transport_send_access_unsegmented(mesh_upper_transport_pdu_t * upper_pdu){ 648 649 // provide segment 650 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) upper_pdu->lower_pdu; 651 652 // setup network pdu 653 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS; 654 network_pdu->data[0] = upper_pdu->ivi_nid; 655 network_pdu->data[1] = upper_pdu->ctl_ttl; 656 big_endian_store_24(network_pdu->data, 2, upper_pdu->seq); 657 big_endian_store_16(network_pdu->data, 5, upper_pdu->src); 658 big_endian_store_16(network_pdu->data, 7, upper_pdu->dst); 659 network_pdu->netkey_index = upper_pdu->netkey_index; 660 661 // setup access message 662 network_pdu->data[9] = upper_pdu->akf_aid_control; 663 btstack_assert(upper_pdu->len < 15); 664 (void)memcpy(&network_pdu->data[10], &incoming_pdu_singleton.access.data, upper_pdu->len); 665 network_pdu->len = 10 + upper_pdu->len; 666 network_pdu->flags = 0; 667 668 // queue up 669 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 670 671 mesh_lower_transport_send_pdu((mesh_pdu_t*) network_pdu); 672 } 673 674 static void mesh_upper_transport_send_access_ccm(void * arg){ 675 crypto_active = 0; 676 677 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 678 mesh_print_hex("EncAccessPayload", incoming_pdu_singleton.access.data, upper_pdu->len); 679 // store TransMIC 680 btstack_crypto_ccm_get_authentication_value(&ccm, &incoming_pdu_singleton.access.data[upper_pdu->len]); 681 uint8_t transmic_len = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 682 mesh_print_hex("TransMIC", &incoming_pdu_singleton.access.data[upper_pdu->len], transmic_len); 683 upper_pdu->len += transmic_len; 684 mesh_print_hex("UpperTransportPDU", incoming_pdu_singleton.access.data, upper_pdu->len); 685 switch (upper_pdu->pdu_header.pdu_type){ 686 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 687 mesh_upper_transport_send_access_unsegmented(upper_pdu); 688 break; 689 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 690 mesh_upper_transport_send_access_segmented(upper_pdu); 691 break; 692 default: 693 btstack_assert(false); 694 } 695 } 696 697 static void mesh_upper_transport_send_access_digest(void *arg){ 698 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 699 uint16_t access_pdu_len = upper_pdu->len; 700 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, incoming_pdu_singleton.access.data, incoming_pdu_singleton.access.data, 701 &mesh_upper_transport_send_access_ccm, upper_pdu); 702 } 703 704 static void mesh_upper_transport_send_access(mesh_upper_transport_pdu_t * upper_pdu){ 705 706 // if dst is virtual address, lookup label uuid and hash 707 uint16_t aad_len = 0; 708 mesh_virtual_address_t * virtual_address = NULL; 709 if (mesh_network_address_virtual(upper_pdu->dst)){ 710 virtual_address = mesh_virtual_address_for_pseudo_dst(upper_pdu->dst); 711 if (!virtual_address){ 712 printf("No virtual address register for pseudo dst %4x\n", upper_pdu->dst); 713 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 714 return; 715 } 716 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 717 // printf_hexdump(virtual_address->label_uuid, 16); 718 aad_len = 16; 719 upper_pdu->dst = virtual_address->hash; 720 } 721 722 // get app or device key 723 uint16_t appkey_index = upper_pdu->appkey_index; 724 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(upper_pdu->netkey_index, appkey_index); 725 if (appkey == NULL){ 726 printf("AppKey %04x not found, drop message\n", appkey_index); 727 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 728 return; 729 } 730 731 // reserve slot 732 mesh_lower_transport_reserve_slot(); 733 734 // reserve one sequence number, which is also used to encrypt access payload 735 uint32_t seq = mesh_sequence_number_next(); 736 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 737 upper_pdu->seq = seq; 738 739 // also reserves crypto_buffer 740 crypto_active = 1; 741 742 // flatten segmented pdu into crypto buffer 743 uint16_t payload_len = mesh_upper_pdu_flatten(upper_pdu, incoming_pdu_singleton.access.data, sizeof(incoming_pdu_singleton.access.data)); 744 btstack_assert(payload_len == upper_pdu->len); 745 UNUSED(payload_len); 746 747 // Dump PDU 748 printf("[+] Upper transport, send upper (un)segmented Access PDU - dest %04x, seq %06x\n", upper_pdu->dst, upper_pdu->seq); 749 mesh_print_hex("Access Payload", incoming_pdu_singleton.access.data, upper_pdu->len); 750 751 // setup nonce - uses dst, so after pseudo address translation 752 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 753 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 754 } else { 755 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 756 } 757 758 // Dump key 759 mesh_print_hex("AppOrDevKey", appkey->key, 16); 760 761 // encrypt ccm 762 uint8_t transmic_len = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 763 uint16_t access_pdu_len = upper_pdu->len; 764 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 765 if (virtual_address){ 766 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 767 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, 768 &mesh_upper_transport_send_access_digest, upper_pdu); 769 } else { 770 mesh_upper_transport_send_access_digest(upper_pdu); 771 } 772 } 773 774 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 775 // reserve slot 776 mesh_lower_transport_reserve_slot(); 777 // reserve sequence number 778 uint32_t seq = mesh_sequence_number_next(); 779 mesh_network_pdu_set_seq(network_pdu, seq); 780 // Dump PDU 781 uint8_t opcode = network_pdu->data[9]; 782 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 783 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 784 785 // send 786 mesh_lower_transport_send_pdu((mesh_pdu_t *) network_pdu); 787 } 788 789 static void mesh_upper_transport_send_segmented_control_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 790 // reserve slot 791 mesh_lower_transport_reserve_slot(); 792 // reserve sequence number 793 uint32_t seq = mesh_sequence_number_next(); 794 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 795 upper_pdu->seq = seq; 796 // Dump PDU 797 // uint8_t opcode = upper_pdu->data[0]; 798 // printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", upper_pdu, seq, opcode); 799 // mesh_print_hex("Access Payload", &upper_pdu->data[1], upper_pdu->len - 1); 800 // send 801 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 802 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 803 804 // lend segments to lower transport pdu 805 segmented_pdu->segments = upper_pdu->segments; 806 upper_pdu->segments = NULL; 807 808 // copy meta 809 segmented_pdu->len = upper_pdu->len; 810 segmented_pdu->netkey_index = upper_pdu->netkey_index; 811 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 812 segmented_pdu->flags = upper_pdu->flags; 813 814 btstack_assert((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) == 0); 815 816 // setup segmented_pdu header 817 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 818 segmented_pdu->ivi_nid = upper_pdu->ivi_nid; 819 segmented_pdu->ctl_ttl = upper_pdu->ctl_ttl; 820 segmented_pdu->seq = upper_pdu->seq; 821 segmented_pdu->src = upper_pdu->src; 822 segmented_pdu->dst = upper_pdu->dst; 823 824 // queue up 825 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 826 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 827 828 mesh_lower_transport_send_pdu((mesh_pdu_t *) segmented_pdu); 829 } 830 831 static void mesh_upper_transport_run(void){ 832 833 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 834 835 if (crypto_active) return; 836 837 // get next message 838 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(&upper_transport_incoming); 839 mesh_network_pdu_t * network_pdu; 840 mesh_segmented_pdu_t * segmented_pdu; 841 switch (pdu->pdu_type){ 842 case MESH_PDU_TYPE_UNSEGMENTED: 843 network_pdu = (mesh_network_pdu_t *) pdu; 844 // control? 845 if (mesh_network_control(network_pdu)) { 846 847 incoming_control_pdu = &incoming_pdu_singleton.control; 848 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 849 incoming_control_pdu->len = network_pdu->len; 850 incoming_control_pdu->netkey_index = network_pdu->netkey_index; 851 852 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 853 854 incoming_control_pdu->akf_aid_control = lower_transport_pdu[0]; 855 incoming_control_pdu->len = network_pdu->len - 10; // 9 header + 1 opcode 856 (void)memcpy(incoming_control_pdu->data, &lower_transport_pdu[1], incoming_control_pdu->len); 857 858 // copy meta data into encrypted pdu buffer 859 incoming_control_pdu->ivi_nid = network_pdu->data[0]; 860 incoming_control_pdu->ctl_ttl = network_pdu->data[1]; 861 incoming_control_pdu->seq = big_endian_read_24(network_pdu->data, 2); 862 incoming_control_pdu->src = big_endian_read_16(network_pdu->data, 5); 863 incoming_control_pdu->dst = big_endian_read_16(network_pdu->data, 7); 864 865 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 866 867 // free mesh message 868 mesh_lower_transport_message_processed_by_higher_layer(pdu); 869 870 btstack_assert(mesh_control_message_handler != NULL); 871 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t*) incoming_control_pdu); 872 873 } else { 874 875 incoming_access_encrypted = (mesh_pdu_t *) network_pdu; 876 877 incoming_access_decrypted = &incoming_pdu_singleton.access; 878 incoming_access_decrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 879 incoming_access_decrypted->flags = 0; 880 incoming_access_decrypted->netkey_index = network_pdu->netkey_index; 881 incoming_access_decrypted->akf_aid_control = network_pdu->data[9]; 882 incoming_access_decrypted->len = network_pdu->len - 10; // 9 header + 1 AID 883 incoming_access_decrypted->ivi_nid = network_pdu->data[0]; 884 incoming_access_decrypted->ctl_ttl = network_pdu->data[1]; 885 incoming_access_decrypted->seq = big_endian_read_24(network_pdu->data, 2); 886 incoming_access_decrypted->src = big_endian_read_16(network_pdu->data, 5); 887 incoming_access_decrypted->dst = big_endian_read_16(network_pdu->data, 7); 888 889 mesh_upper_transport_process_access_message(); 890 } 891 break; 892 case MESH_PDU_TYPE_SEGMENTED: 893 segmented_pdu = (mesh_segmented_pdu_t *) pdu; 894 uint8_t ctl = segmented_pdu->ctl_ttl >> 7; 895 if (ctl){ 896 incoming_control_pdu= &incoming_pdu_singleton.control; 897 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 898 899 // flatten 900 mesh_segmented_pdu_flatten(&segmented_pdu->segments, 8, incoming_control_pdu->data); 901 902 // copy meta data into encrypted pdu buffer 903 incoming_control_pdu->flags = 0; 904 incoming_control_pdu->len = segmented_pdu->len; 905 incoming_control_pdu->netkey_index = segmented_pdu->netkey_index; 906 incoming_control_pdu->akf_aid_control = segmented_pdu->akf_aid_control; 907 incoming_control_pdu->ivi_nid = segmented_pdu->ivi_nid; 908 incoming_control_pdu->ctl_ttl = segmented_pdu->ctl_ttl; 909 incoming_control_pdu->seq = segmented_pdu->seq; 910 incoming_control_pdu->src = segmented_pdu->src; 911 incoming_control_pdu->dst = segmented_pdu->dst; 912 913 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 914 915 // free mesh message 916 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)segmented_pdu); 917 918 btstack_assert(mesh_control_message_handler != NULL); 919 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t*) incoming_control_pdu); 920 921 } else { 922 923 incoming_access_encrypted = (mesh_pdu_t *) segmented_pdu; 924 925 incoming_access_decrypted = &incoming_pdu_singleton.access; 926 incoming_access_decrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 927 incoming_access_decrypted->flags = segmented_pdu->flags; 928 incoming_access_decrypted->len = segmented_pdu->len; 929 incoming_access_decrypted->netkey_index = segmented_pdu->netkey_index; 930 incoming_access_decrypted->akf_aid_control = segmented_pdu->akf_aid_control; 931 incoming_access_decrypted->ivi_nid = segmented_pdu->ivi_nid; 932 incoming_access_decrypted->ctl_ttl = segmented_pdu->ctl_ttl; 933 incoming_access_decrypted->seq = segmented_pdu->seq; 934 incoming_access_decrypted->src = segmented_pdu->src; 935 incoming_access_decrypted->dst = segmented_pdu->dst; 936 937 mesh_upper_transport_process_access_message(); 938 } 939 break; 940 default: 941 btstack_assert(0); 942 break; 943 } 944 } 945 946 btstack_linked_list_iterator_t it; 947 btstack_linked_list_iterator_init(&it, &upper_transport_outgoing); 948 while (btstack_linked_list_iterator_has_next(&it)){ 949 950 if (crypto_active) break; 951 952 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_iterator_next(&it); 953 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == false) { 954 // skip pdu for now 955 continue; 956 } 957 958 mesh_upper_transport_pdu_t * upper_pdu; 959 mesh_segmented_pdu_t * segmented_pdu; 960 uint8_t transmic_len; 961 bool ok; 962 bool abort_outgoing_loop = false; 963 964 switch (pdu->pdu_type){ 965 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 966 // control pdus can go through directly 967 btstack_assert(mesh_pdu_ctl(pdu) != 0); 968 btstack_linked_list_iterator_remove(&it); 969 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 970 break; 971 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 972 // control pdus can go through directly 973 btstack_assert(mesh_pdu_ctl(pdu) != 0); 974 btstack_linked_list_iterator_remove(&it); 975 mesh_upper_transport_send_segmented_control_pdu((mesh_upper_transport_pdu_t *) pdu); 976 break; 977 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 978 // segmented access pdus required a mesh-segmented-pdu 979 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 980 if (upper_pdu->lower_pdu == NULL){ 981 upper_pdu->lower_pdu = (mesh_pdu_t *) btstack_memory_mesh_segmented_pdu_get(); 982 } 983 if (upper_pdu->lower_pdu == NULL){ 984 mesh_upper_transport_need_pdu_for_run_outgoing(); 985 abort_outgoing_loop = true; 986 break; 987 } 988 segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 989 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 990 // and a mesh-network-pdu for each segment in upper pdu 991 transmic_len = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 992 ok = mesh_segmented_allocate_segments(&segmented_pdu->segments, upper_pdu->len + transmic_len); 993 if (!ok) { 994 abort_outgoing_loop = true; 995 break; 996 } 997 // all buffers available, get started 998 btstack_linked_list_iterator_remove(&it); 999 mesh_upper_transport_send_access(upper_pdu); 1000 break; 1001 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1002 // unsegmented access pdus require a single mesh-network-dpu 1003 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 1004 if (upper_pdu->lower_pdu == NULL){ 1005 upper_pdu->lower_pdu = (mesh_pdu_t *) mesh_network_pdu_get(); 1006 } 1007 if (upper_pdu->lower_pdu == NULL) { 1008 mesh_upper_transport_need_pdu_for_run_outgoing(); 1009 abort_outgoing_loop = true; 1010 break; 1011 } 1012 btstack_linked_list_iterator_remove(&it); 1013 mesh_upper_transport_send_access((mesh_upper_transport_pdu_t *) pdu); 1014 break; 1015 default: 1016 btstack_assert(false); 1017 break; 1018 } 1019 if (abort_outgoing_loop) { 1020 break; 1021 } 1022 } 1023 } 1024 1025 static mesh_upper_transport_pdu_t * mesh_upper_transport_find_and_remove_pdu_for_lower(mesh_pdu_t * pdu_to_find){ 1026 btstack_linked_list_iterator_t it; 1027 btstack_linked_list_iterator_init(&it, &upper_transport_outgoing_active); 1028 mesh_upper_transport_pdu_t * upper_pdu; 1029 while (btstack_linked_list_iterator_has_next(&it)){ 1030 mesh_pdu_t * mesh_pdu = (mesh_pdu_t *) btstack_linked_list_iterator_next(&it); 1031 switch (mesh_pdu->pdu_type){ 1032 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1033 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1034 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1035 upper_pdu = (mesh_upper_transport_pdu_t *) mesh_pdu; 1036 if (upper_pdu->lower_pdu == pdu_to_find){ 1037 btstack_linked_list_iterator_remove(&it); 1038 return upper_pdu; 1039 } 1040 break; 1041 default: 1042 break; 1043 } 1044 } 1045 return NULL; 1046 } 1047 1048 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 1049 mesh_upper_transport_pdu_t * upper_pdu; 1050 mesh_segmented_pdu_t * segmented_pdu; 1051 switch (callback_type){ 1052 case MESH_TRANSPORT_PDU_RECEIVED: 1053 mesh_upper_transport_message_received(pdu); 1054 break; 1055 case MESH_TRANSPORT_PDU_SENT: 1056 switch (pdu->pdu_type){ 1057 case MESH_PDU_TYPE_SEGMENTED: 1058 // try to find in outgoing active 1059 upper_pdu = mesh_upper_transport_find_and_remove_pdu_for_lower(pdu); 1060 btstack_assert(upper_pdu != NULL); 1061 segmented_pdu = (mesh_segmented_pdu_t *) pdu; 1062 // free chunks 1063 while (!btstack_linked_list_empty(&segmented_pdu->segments)){ 1064 mesh_network_pdu_t * chunk_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&segmented_pdu->segments); 1065 mesh_network_pdu_free(chunk_pdu); 1066 } 1067 // free segmented pdu 1068 btstack_memory_mesh_segmented_pdu_free(segmented_pdu); 1069 upper_pdu->lower_pdu = NULL; 1070 switch (upper_pdu->pdu_header.pdu_type){ 1071 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1072 mesh_control_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 1073 break; 1074 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1075 mesh_access_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 1076 break; 1077 default: 1078 btstack_assert(false); 1079 break; 1080 } 1081 break; 1082 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1083 // find corresponding upper transport pdu and free single segment 1084 upper_pdu = mesh_upper_transport_find_and_remove_pdu_for_lower(pdu); 1085 btstack_assert(upper_pdu != NULL); 1086 btstack_assert(upper_pdu->lower_pdu == (mesh_pdu_t *) pdu); 1087 mesh_network_pdu_free((mesh_network_pdu_t *) pdu); 1088 upper_pdu->lower_pdu = NULL; 1089 mesh_access_message_handler(callback_type, status, (mesh_pdu_t*) upper_pdu); 1090 break; 1091 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1092 mesh_access_message_handler(callback_type, status, pdu); 1093 break; 1094 default: 1095 btstack_assert(false); 1096 break; 1097 } 1098 mesh_upper_transport_run(); 1099 break; 1100 default: 1101 break; 1102 } 1103 } 1104 1105 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 1106 btstack_assert(pdu != NULL); 1107 mesh_network_pdu_t * network_pdu; 1108 mesh_segmented_pdu_t * message_pdu; 1109 mesh_upper_transport_pdu_t * upper_pdu; 1110 switch (pdu->pdu_type) { 1111 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1112 case MESH_PDU_TYPE_NETWORK: 1113 network_pdu = (mesh_network_pdu_t *) pdu; 1114 mesh_network_pdu_free(network_pdu); 1115 break; 1116 case MESH_PDU_TYPE_SEGMENTED: 1117 message_pdu = (mesh_segmented_pdu_t *) pdu; 1118 mesh_segmented_pdu_free(message_pdu); 1119 break; 1120 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1121 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1122 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1123 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 1124 while (upper_pdu->segments) { 1125 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_pop(&upper_pdu->segments); 1126 mesh_network_pdu_free(segment); 1127 } 1128 btstack_memory_mesh_upper_transport_pdu_free(upper_pdu); 1129 // check if send request can be handled now 1130 mesh_upper_transport_schedule_send_requests(); 1131 break; 1132 default: 1133 btstack_assert(false); 1134 break; 1135 } 1136 } 1137 1138 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 1139 crypto_active = 0; 1140 switch (pdu->pdu_type){ 1141 case MESH_PDU_TYPE_ACCESS: 1142 mesh_upper_transport_process_access_message_done((mesh_access_pdu_t *) pdu); 1143 break; 1144 case MESH_PDU_TYPE_CONTROL: 1145 mesh_upper_transport_process_control_message_done((mesh_control_pdu_t *) pdu); 1146 break; 1147 default: 1148 btstack_assert(0); 1149 break; 1150 } 1151 } 1152 1153 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 1154 switch (pdu->pdu_type){ 1155 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1156 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1157 break; 1158 default: 1159 btstack_assert(false); 1160 break; 1161 } 1162 1163 btstack_assert(((mesh_upper_transport_pdu_t *) pdu)->lower_pdu == NULL); 1164 1165 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1166 mesh_upper_transport_run(); 1167 } 1168 1169 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 1170 switch (pdu->pdu_type){ 1171 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1172 break; 1173 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1174 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 1175 break; 1176 default: 1177 btstack_assert(false); 1178 break; 1179 } 1180 1181 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1182 mesh_upper_transport_run(); 1183 } 1184 1185 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, 1186 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1187 1188 btstack_assert(network_pdu != NULL); 1189 btstack_assert(control_pdu_len <= 11); 1190 1191 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1192 if (!network_key) return 1; 1193 1194 uint8_t transport_pdu_data[12]; 1195 transport_pdu_data[0] = opcode; 1196 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 1197 uint16_t transport_pdu_len = control_pdu_len + 1; 1198 1199 // setup network_pdu 1200 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL; 1201 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 1202 1203 return 0; 1204 } 1205 1206 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){ 1207 1208 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1209 if (!network_key) return 1; 1210 1211 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1212 upper_pdu->ctl_ttl = ttl; 1213 upper_pdu->src = src; 1214 upper_pdu->dst = dest; 1215 upper_pdu->netkey_index = netkey_index; 1216 upper_pdu->akf_aid_control = opcode; 1217 return 0; 1218 } 1219 1220 static uint8_t mesh_upper_transport_setup_upper_access_pdu_header(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, 1221 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1222 1223 // get app or device key 1224 const mesh_transport_key_t *appkey; 1225 appkey = mesh_transport_key_get(appkey_index); 1226 if (appkey == NULL) { 1227 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 1228 return 1; 1229 } 1230 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1231 1232 // lookup network by netkey_index 1233 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 1234 if (!network_key) return 1; 1235 if (network_key == NULL) { 1236 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 1237 return 1; 1238 } 1239 1240 // store in transport pdu 1241 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1242 upper_pdu->ctl_ttl = ttl; 1243 upper_pdu->src = src; 1244 upper_pdu->dst = dest; 1245 upper_pdu->netkey_index = netkey_index; 1246 upper_pdu->appkey_index = appkey_index; 1247 upper_pdu->akf_aid_control = akf_aid; 1248 if (szmic) { 1249 upper_pdu->flags |= MESH_TRANSPORT_FLAG_TRANSMIC_64; 1250 } 1251 return 0; 1252 } 1253 1254 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 1255 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1256 switch (pdu->pdu_type){ 1257 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1258 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1259 return mesh_upper_transport_setup_upper_access_pdu_header((mesh_upper_transport_pdu_t *) pdu, netkey_index, 1260 appkey_index, ttl, src, dest, szmic); 1261 default: 1262 btstack_assert(false); 1263 return 1; 1264 } 1265 } 1266 1267 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)) { 1268 mesh_access_message_handler = callback; 1269 } 1270 1271 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)){ 1272 mesh_control_message_handler = callback; 1273 } 1274 1275 void mesh_upper_transport_init(){ 1276 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1277 } 1278 1279 bool mesh_upper_transport_message_reserve(void){ 1280 if (message_builder_reserved_upper_pdu == NULL){ 1281 message_builder_reserved_upper_pdu = btstack_memory_mesh_upper_transport_pdu_get(); 1282 } 1283 if (message_builder_reserved_upper_pdu == NULL){ 1284 return false; 1285 } 1286 while (message_builder_num_network_pdus_reserved < MESSAGE_BUILDER_MAX_NUM_NETWORK_PDUS){ 1287 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 1288 if (network_pdu == NULL){ 1289 return false; 1290 } 1291 btstack_linked_list_add(&message_builder_reserved_network_pdus, (btstack_linked_item_t *) network_pdu); 1292 message_builder_num_network_pdus_reserved++; 1293 } 1294 return true; 1295 } 1296 1297 void mesh_upper_transport_message_init(mesh_upper_transport_builder_t * builder, mesh_pdu_type_t pdu_type) { 1298 btstack_assert(builder != NULL); 1299 1300 // use reserved buffer if available 1301 if (message_builder_reserved_upper_pdu != NULL){ 1302 builder->pdu = message_builder_reserved_upper_pdu; 1303 message_builder_reserved_upper_pdu = NULL; 1304 } else { 1305 builder->pdu = btstack_memory_mesh_upper_transport_pdu_get(); 1306 } 1307 if (!builder->pdu) return; 1308 1309 builder->segment = NULL; 1310 builder->pdu->pdu_header.pdu_type = pdu_type; 1311 builder->pdu->ack_opcode = MESH_ACCESS_OPCODE_NOT_SET; 1312 } 1313 1314 1315 void mesh_upper_transport_message_add_data(mesh_upper_transport_builder_t * builder, const uint8_t * data, uint16_t data_len){ 1316 btstack_assert(builder != NULL); 1317 1318 if (builder->pdu == NULL) return; 1319 1320 builder->pdu->len += data_len; 1321 1322 uint16_t bytes_current_segment = 0; 1323 if (builder->segment){ 1324 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX - builder->segment->len; 1325 } 1326 while (data_len > 0){ 1327 if (bytes_current_segment == 0){ 1328 // use reserved buffer if available 1329 if (message_builder_num_network_pdus_reserved > 0){ 1330 message_builder_num_network_pdus_reserved--; 1331 builder->segment = (mesh_network_pdu_t *) btstack_linked_list_pop(&message_builder_reserved_network_pdus); 1332 } else { 1333 builder->segment = (mesh_network_pdu_t *) mesh_network_pdu_get(); 1334 } 1335 if (builder->segment == NULL) { 1336 mesh_upper_transport_pdu_free((mesh_pdu_t *) builder->pdu); 1337 builder->pdu = NULL; 1338 return; 1339 } 1340 btstack_linked_list_add_tail(&builder->pdu->segments, (btstack_linked_item_t *) builder->segment); 1341 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX; 1342 } 1343 uint16_t bytes_to_copy = btstack_min(bytes_current_segment, data_len); 1344 (void) memcpy(&builder->segment->data[builder->segment->len], data, bytes_to_copy); 1345 builder->segment->len += bytes_to_copy; 1346 bytes_current_segment -= bytes_to_copy; 1347 data += bytes_to_copy; 1348 data_len -= bytes_to_copy; 1349 } 1350 } 1351 1352 void mesh_upper_transport_message_add_uint8(mesh_upper_transport_builder_t * builder, uint8_t value){ 1353 mesh_upper_transport_message_add_data(builder, &value, 1); 1354 } 1355 1356 void mesh_upper_transport_message_add_uint16(mesh_upper_transport_builder_t * builder, uint16_t value){ 1357 uint8_t buffer[2]; 1358 little_endian_store_16(buffer, 0, value); 1359 mesh_upper_transport_message_add_data(builder, buffer, sizeof(buffer)); 1360 } 1361 1362 void mesh_upper_transport_message_add_uint24(mesh_upper_transport_builder_t * builder, uint32_t value){ 1363 uint8_t buffer[3]; 1364 little_endian_store_24(buffer, 0, value); 1365 mesh_upper_transport_message_add_data(builder, buffer, sizeof(buffer)); 1366 } 1367 1368 void mesh_upper_transport_message_add_uint32(mesh_upper_transport_builder_t * builder, uint32_t value){ 1369 uint8_t buffer[4]; 1370 little_endian_store_32(buffer, 0, value); 1371 mesh_upper_transport_message_add_data(builder, buffer, sizeof(buffer)); 1372 } 1373 1374 mesh_upper_transport_pdu_t * mesh_upper_transport_message_finalize(mesh_upper_transport_builder_t * builder){ 1375 return builder->pdu; 1376 } 1377