1 /* 2 * Copyright (C) 2018 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 #define __BTSTACK_FILE__ "mesh_network.c" 39 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 44 #include "btstack_debug.h" 45 #include "btstack_event.h" 46 #include "btstack_memory.h" 47 #include "btstack_util.h" 48 49 #include "mesh/beacon.h" 50 #include "mesh/mesh_foundation.h" 51 #include "mesh/mesh_iv_index_seq_number.h" 52 #include "mesh/mesh_keys.h" 53 #include "mesh/mesh_node.h" 54 #include "mesh/provisioning.h" 55 #include "mesh/provisioning_device.h" 56 57 #ifdef ENABLE_MESH_ADV_BEARER 58 #include "mesh/adv_bearer.h" 59 #endif 60 61 #ifdef ENABLE_MESH_GATT_BEARER 62 #include "mesh/gatt_bearer.h" 63 #endif 64 65 // configuration 66 #define MESH_NETWORK_CACHE_SIZE 2 67 68 // debug config 69 // #define LOG_NETWORK 70 71 static void mesh_network_dump_network_pdus(const char * name, btstack_linked_list_t * list); 72 73 // structs 74 75 // globals 76 77 static void (*mesh_network_higher_layer_handler)(mesh_network_callback_type_t callback_type, mesh_network_pdu_t * network_pdu); 78 static void (*mesh_network_proxy_message_handler)(mesh_network_callback_type_t callback_type, mesh_network_pdu_t * network_pdu); 79 80 #ifdef ENABLE_MESH_GATT_BEARER 81 static hci_con_handle_t gatt_bearer_con_handle; 82 #endif 83 84 // shared send/receive crypto 85 static int mesh_crypto_active; 86 87 // crypto requests 88 static union { 89 btstack_crypto_ccm_t ccm; 90 btstack_crypto_aes128_t aes128; 91 } mesh_network_crypto_request; 92 93 static const mesh_network_key_t * current_network_key; 94 95 // PECB calculation 96 static uint8_t encryption_block[16]; 97 static uint8_t obfuscation_block[16]; 98 99 // Subnets 100 static btstack_linked_list_t subnets; 101 102 // Network Nonce 103 static uint8_t network_nonce[13]; 104 105 // INCOMING // 106 107 // unprocessed network pdu - added by mesh_network_pdus_received_message 108 static btstack_linked_list_t network_pdus_received; 109 110 // in validation 111 static mesh_network_pdu_t * incoming_pdu_raw; 112 static mesh_network_pdu_t * incoming_pdu_decoded; 113 static mesh_network_key_iterator_t validation_network_key_it; 114 115 // OUTGOING // 116 117 // Network PDUs queued by mesh_network_send 118 static btstack_linked_list_t network_pdus_queued; 119 120 // Network PDU about to get send via all bearers when encrypted 121 static mesh_network_pdu_t * outgoing_pdu; 122 123 // Network PDUs ready to send via GATT Bearer 124 static btstack_linked_list_t network_pdus_outgoing_gatt; 125 126 #ifdef ENABLE_MESH_GATT_BEARER 127 static mesh_network_pdu_t * gatt_bearer_network_pdu; 128 #endif 129 130 // Network PDUs ready to send via ADV Bearer 131 static btstack_linked_list_t network_pdus_outgoing_adv; 132 133 #ifdef ENABLE_MESH_ADV_BEARER 134 static mesh_network_pdu_t * adv_bearer_network_pdu; 135 #endif 136 137 138 // mesh network cache - we use 32-bit 'hashes' 139 static uint32_t mesh_network_cache[MESH_NETWORK_CACHE_SIZE]; 140 static int mesh_network_cache_index; 141 142 // prototypes 143 144 static void mesh_network_run(void); 145 static void process_network_pdu_validate(void); 146 147 // network caching 148 static uint32_t mesh_network_cache_hash(mesh_network_pdu_t * network_pdu){ 149 // - The SEQ field is a 24-bit integer that when combined with the IV Index, 150 // shall be a unique value for each new Network PDU originated by this node (=> SRC) 151 // - IV updates only rarely 152 // => 16 bit SRC, 1 bit IVI, 15 bit SEQ 153 uint8_t ivi = network_pdu->data[0] >> 7; 154 uint16_t seq = big_endian_read_16(network_pdu->data, 3); 155 uint16_t src = big_endian_read_16(network_pdu->data, 5); 156 return (src << 16) | (ivi << 15) | (seq & 0x7fff); 157 } 158 159 static int mesh_network_cache_find(uint32_t hash){ 160 int i; 161 for (i = 0; i < MESH_NETWORK_CACHE_SIZE; i++) { 162 if (mesh_network_cache[i] == hash) { 163 return 1; 164 } 165 } 166 return 0; 167 } 168 169 static void mesh_network_cache_add(uint32_t hash){ 170 mesh_network_cache[mesh_network_cache_index++] = hash; 171 if (mesh_network_cache_index >= MESH_NETWORK_CACHE_SIZE){ 172 mesh_network_cache_index = 0; 173 } 174 } 175 176 // common helper 177 int mesh_network_address_unicast(uint16_t addr){ 178 return addr != MESH_ADDRESS_UNSASSIGNED && (addr < 0x8000); 179 } 180 181 int mesh_network_address_virtual(uint16_t addr){ 182 return (addr & 0xC000) == 0x8000; // 0b10xx xxxx xxxx xxxx 183 } 184 185 int mesh_network_address_group(uint16_t addr){ 186 return (addr & 0xC000) == 0xC000; // 0b11xx xxxx xxxx xxxx 187 } 188 189 int mesh_network_address_all_proxies(uint16_t addr){ 190 return addr == MESH_ADDRESS_ALL_PROXIES; 191 } 192 193 int mesh_network_address_all_nodes(uint16_t addr){ 194 return addr == MESH_ADDRESS_ALL_NODES; 195 } 196 197 int mesh_network_address_all_friends(uint16_t addr){ 198 return addr == MESH_ADDRESS_ALL_FRIENDS; 199 } 200 201 int mesh_network_address_all_relays(uint16_t addr){ 202 return addr == MESH_ADDRESS_ALL_RELAYS; 203 } 204 205 int mesh_network_addresses_valid(uint8_t ctl, uint16_t src, uint16_t dst){ 206 // printf("CTL: %u\n", ctl); 207 // printf("SRC: %04x\n", src); 208 // printf("DST: %04x\n", dst); 209 if (src == 0){ 210 // printf("SRC Unassigned Addr -> ignore\n"); 211 return 0; 212 } 213 if ((src & 0xC000) == 0x8000){ 214 // printf("SRC Virtual Addr -> ignore\n"); 215 return 0; 216 } 217 if ((src & 0xC000) == 0xC000){ 218 // printf("SRC Group Addr -> ignore\n"); 219 return 0; 220 } 221 if (dst == 0){ 222 // printf("DST Unassigned Addr -> ignore\n"); 223 return 0; 224 } 225 if ( ((dst & 0xC000) == 0x8000) && (ctl == 1)){ 226 // printf("DST Virtual Addr in CONTROL -> ignore\n"); 227 return 0; 228 } 229 if ( (0xFF00 <= dst) && (dst <= 0xfffb) && (ctl == 0) ){ 230 // printf("DST RFU Group Addr in MESSAGE -> ignore\n"); 231 return 0; 232 } 233 // printf("SRC + DST Addr valid\n"); 234 return 1; 235 } 236 237 static void mesh_network_create_nonce(uint8_t * nonce, const mesh_network_pdu_t * pdu, uint32_t iv_index){ 238 unsigned int pos = 0; 239 nonce[pos++] = 0x0; // Network Nonce 240 memcpy(&nonce[pos], &pdu->data[1], 6); 241 pos += 6; 242 big_endian_store_16(nonce, pos, 0); 243 pos += 2; 244 big_endian_store_32(nonce, pos, iv_index); 245 } 246 247 static void mesh_proxy_create_nonce(uint8_t * nonce, const mesh_network_pdu_t * pdu, uint32_t iv_index){ 248 unsigned int pos = 0; 249 nonce[pos++] = 0x3; // Proxy Nonce 250 nonce[pos++] = 0; 251 memcpy(&nonce[pos], &pdu->data[2], 5); 252 pos += 5; 253 big_endian_store_16(nonce, pos, 0); 254 pos += 2; 255 big_endian_store_32(nonce, pos, iv_index); 256 } 257 258 // NID/IVI | obfuscated (CTL/TTL, SEQ (24), SRC (16) ), encrypted ( DST(16), TransportPDU), MIC(32 or 64) 259 260 static void mesh_network_send_complete(mesh_network_pdu_t * network_pdu){ 261 if (network_pdu->flags & MESH_NETWORK_PDU_FLAGS_RELAY){ 262 #ifdef LOG_NETWORK 263 printf("TX-F-NetworkPDU (%p): relay -> free packet\n", network_pdu); 264 #endif 265 mesh_network_pdu_free(network_pdu); 266 } else { 267 #ifdef LOG_NETWORK 268 printf("TX-F-NetworkPDU (%p): notify lower transport\n", network_pdu); 269 #endif 270 // notify higher layer 271 (*mesh_network_higher_layer_handler)(MESH_NETWORK_PDU_SENT, network_pdu); 272 } 273 } 274 275 static void mesh_network_send_d(mesh_network_pdu_t * network_pdu){ 276 277 #ifdef LOG_NETWORK 278 printf("TX-D-NetworkPDU (%p): ", network_pdu); 279 printf_hexdump(network_pdu->data, network_pdu->len); 280 #endif 281 282 // add to queue 283 btstack_linked_list_add_tail(&network_pdus_outgoing_gatt, (btstack_linked_item_t *) network_pdu); 284 285 // go 286 mesh_network_run(); 287 } 288 289 // new 290 static void mesh_network_send_c(void *arg){ 291 UNUSED(arg); 292 293 // obfuscate 294 unsigned int i; 295 for (i=0;i<6;i++){ 296 outgoing_pdu->data[1+i] ^= obfuscation_block[i]; 297 } 298 299 #ifdef LOG_NETWORK 300 printf("TX-C-NetworkPDU (%p): ", outgoing_pdu); 301 printf_hexdump(outgoing_pdu->data, outgoing_pdu->len); 302 #endif 303 304 // crypto done 305 mesh_crypto_active = 0; 306 307 // done 308 mesh_network_pdu_t * network_pdu = outgoing_pdu; 309 outgoing_pdu = NULL; 310 (network_pdu->callback)(network_pdu); 311 } 312 313 static void mesh_network_send_b(void *arg){ 314 UNUSED(arg); 315 316 uint32_t iv_index = mesh_get_iv_index_for_tx(); 317 318 // store NetMIC 319 uint8_t net_mic[8]; 320 btstack_crypto_ccm_get_authentication_value(&mesh_network_crypto_request.ccm, net_mic); 321 322 // store MIC 323 uint8_t net_mic_len = outgoing_pdu->data[1] & 0x80 ? 8 : 4; 324 memcpy(&outgoing_pdu->data[outgoing_pdu->len], net_mic, net_mic_len); 325 outgoing_pdu->len += net_mic_len; 326 327 btstack_assert(outgoing_pdu->len <= 29); 328 329 #ifdef LOG_NETWORK 330 printf("TX-B-NetworkPDU (%p): ", outgoing_pdu); 331 printf_hexdump(outgoing_pdu->data, outgoing_pdu->len); 332 #endif 333 334 // calc PECB 335 memset(encryption_block, 0, 5); 336 big_endian_store_32(encryption_block, 5, iv_index); 337 memcpy(&encryption_block[9], &outgoing_pdu->data[7], 7); 338 btstack_crypto_aes128_encrypt(&mesh_network_crypto_request.aes128, current_network_key->privacy_key, encryption_block, obfuscation_block, &mesh_network_send_c, NULL); 339 } 340 341 static void mesh_network_send_a(void){ 342 343 mesh_crypto_active = 1; 344 345 uint32_t iv_index = mesh_get_iv_index_for_tx(); 346 347 // lookup subnet by netkey_index 348 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(outgoing_pdu->netkey_index); 349 if (!subnet) { 350 mesh_crypto_active = 0; 351 mesh_network_pdu_t * network_pdu = outgoing_pdu; 352 outgoing_pdu = NULL; 353 // notify upper layer 354 mesh_network_send_complete(network_pdu); 355 // run again 356 mesh_network_run(); 357 return; 358 } 359 360 // get network key to use for sending 361 current_network_key = mesh_subnet_get_outgoing_network_key(subnet); 362 363 #ifdef LOG_NETWORK 364 printf("TX-A-NetworkPDU (%p): ", outgoing_pdu); 365 printf_hexdump(outgoing_pdu->data, outgoing_pdu->len); 366 #endif 367 368 // get network nonce 369 if (outgoing_pdu->flags & MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION){ 370 mesh_proxy_create_nonce(network_nonce, outgoing_pdu, iv_index); 371 #ifdef LOG_NETWORK 372 printf("TX-ProxyNonce: "); 373 printf_hexdump(network_nonce, 13); 374 #endif 375 } else { 376 mesh_network_create_nonce(network_nonce, outgoing_pdu, iv_index); 377 #ifdef LOG_NETWORK 378 printf("TX-NetworkNonce: "); 379 printf_hexdump(network_nonce, 13); 380 #endif 381 } 382 383 #ifdef LOG_NETWORK 384 printf("TX-EncryptionKey: "); 385 printf_hexdump(current_network_key->encryption_key, 16); 386 #endif 387 388 // start ccm 389 uint8_t cypher_len = outgoing_pdu->len - 7; 390 uint8_t net_mic_len = outgoing_pdu->data[1] & 0x80 ? 8 : 4; 391 btstack_crypto_ccm_init(&mesh_network_crypto_request.ccm, current_network_key->encryption_key, network_nonce, cypher_len, 0, net_mic_len); 392 btstack_crypto_ccm_encrypt_block(&mesh_network_crypto_request.ccm, cypher_len, &outgoing_pdu->data[7], &outgoing_pdu->data[7], &mesh_network_send_b, NULL); 393 } 394 395 #if defined(ENABLE_MESH_RELAY) || defined (ENABLE_MESH_PROXY_SERVER) 396 static void mesh_network_relay_message(mesh_network_pdu_t * network_pdu){ 397 398 uint8_t ctl_ttl = network_pdu->data[1]; 399 uint8_t ctl = ctl_ttl & 0x80; 400 uint8_t ttl = ctl_ttl & 0x7f; 401 402 #ifdef LOG_NETWORK 403 printf("TX-Relay-NetworkPDU (%p): ", network_pdu); 404 printf_hexdump(network_pdu->data, network_pdu->len); 405 printf("^^ into network_pdus_queued\n"); 406 #endif 407 408 // prepare pdu for resending 409 network_pdu->data[1] = (ctl << 7) | (ttl - 1); 410 network_pdu->flags |= MESH_NETWORK_PDU_FLAGS_RELAY; 411 412 // queue up 413 network_pdu->callback = &mesh_network_send_d; 414 btstack_linked_list_add_tail(&network_pdus_queued, (btstack_linked_item_t *) network_pdu); 415 } 416 #endif 417 418 void mesh_network_message_processed_by_higher_layer(mesh_network_pdu_t * network_pdu){ 419 420 #if defined(ENABLE_MESH_RELAY) || defined (ENABLE_MESH_PROXY_SERVER) 421 422 // check if address does not matches elements on our node and TTL >= 2 423 uint16_t src = mesh_network_src(network_pdu); 424 uint8_t ttl = mesh_network_ttl(network_pdu); 425 426 uint16_t mesh_network_primary_address = mesh_node_get_primary_element_address(); 427 428 if (((src < mesh_network_primary_address) || (src > (mesh_network_primary_address + mesh_node_element_count()))) && (ttl >= 2)){ 429 430 if ((network_pdu->flags & MESH_NETWORK_PDU_FLAGS_GATT_BEARER) == 0){ 431 432 // message received via ADV bearer are relayed: 433 434 #ifdef ENABLE_MESH_RELAY 435 if (mesh_foundation_relay_get() != 0){ 436 // - to ADV bearer, if Relay supported and enabled 437 mesh_network_relay_message(network_pdu); 438 mesh_network_run(); 439 return; 440 } 441 #endif 442 443 #ifdef ENABLE_MESH_PROXY_SERVER 444 if (mesh_foundation_gatt_proxy_get() != 0){ 445 // - to GATT bearer, if Proxy supported and enabled 446 mesh_network_relay_message(network_pdu); 447 mesh_network_run(); 448 return; 449 } 450 #endif 451 452 } else { 453 454 // messages received via GATT bearer are relayed: 455 456 #ifdef ENABLE_MESH_PROXY_SERVER 457 if (mesh_foundation_gatt_proxy_get() != 0){ 458 // - to ADV bearer, if Proxy supported and enabled 459 mesh_network_relay_message(network_pdu); 460 mesh_network_run(); 461 return; 462 } 463 #endif 464 465 } 466 } 467 #endif 468 469 // otherwise, we're done 470 btstack_memory_mesh_network_pdu_free(network_pdu); 471 } 472 473 static void process_network_pdu_done(void){ 474 btstack_memory_mesh_network_pdu_free(incoming_pdu_raw); 475 incoming_pdu_raw = NULL; 476 mesh_crypto_active = 0; 477 478 mesh_network_run(); 479 } 480 481 static void process_network_pdu_validate_d(void * arg){ 482 UNUSED(arg); 483 // mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) arg; 484 485 uint8_t ctl_ttl = incoming_pdu_decoded->data[1]; 486 uint8_t ctl = ctl_ttl >> 7; 487 uint8_t net_mic_len = (ctl_ttl & 0x80) ? 8 : 4; 488 489 // store NetMIC 490 uint8_t net_mic[8]; 491 btstack_crypto_ccm_get_authentication_value(&mesh_network_crypto_request.ccm, net_mic); 492 #ifdef LOG_NETWORK 493 printf("RX-NetMIC (%p): ", incoming_pdu_decoded); 494 printf_hexdump(net_mic, net_mic_len); 495 #endif 496 // store in decoded pdu 497 memcpy(&incoming_pdu_decoded->data[incoming_pdu_decoded->len-net_mic_len], net_mic, net_mic_len); 498 499 #ifdef LOG_NETWORK 500 uint8_t cypher_len = incoming_pdu_decoded->len - 9 - net_mic_len; 501 printf("RX-Decrypted DST/TransportPDU (%p): ", incoming_pdu_decoded); 502 printf_hexdump(&incoming_pdu_decoded->data[7], 2 + cypher_len); 503 504 printf("RX-Decrypted: "); 505 printf_hexdump(incoming_pdu_decoded->data, incoming_pdu_decoded->len); 506 #endif 507 508 // validate network mic 509 if (memcmp(net_mic, &incoming_pdu_raw->data[incoming_pdu_decoded->len-net_mic_len], net_mic_len) != 0){ 510 // fail 511 printf("RX-NetMIC mismatch, try next key (%p)\n", incoming_pdu_decoded); 512 process_network_pdu_validate(); 513 return; 514 } 515 516 // remove NetMIC from payload 517 incoming_pdu_decoded->len -= net_mic_len; 518 519 #ifdef LOG_NETWORK 520 // match 521 printf("RX-NetMIC matches (%p)\n", incoming_pdu_decoded); 522 printf("RX-TTL (%p): 0x%02x\n", incoming_pdu_decoded, incoming_pdu_decoded->data[1] & 0x7f); 523 #endif 524 525 // set netkey_index 526 incoming_pdu_decoded->netkey_index = current_network_key->netkey_index; 527 528 if (incoming_pdu_decoded->flags & MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION){ 529 530 mesh_network_pdu_t * decoded_pdu = incoming_pdu_decoded; 531 incoming_pdu_decoded = NULL; 532 533 // no additional checks for proxy messages 534 (*mesh_network_proxy_message_handler)(MESH_NETWORK_PDU_RECEIVED, decoded_pdu); 535 536 } else { 537 538 // validate src/dest addresses 539 uint16_t src = big_endian_read_16(incoming_pdu_decoded->data, 5); 540 uint16_t dst = big_endian_read_16(incoming_pdu_decoded->data, 7); 541 int valid = mesh_network_addresses_valid(ctl, src, dst); 542 if (!valid){ 543 #ifdef LOG_NETWORK 544 printf("RX Address invalid (%p)\n", incoming_pdu_decoded); 545 #endif 546 btstack_memory_mesh_network_pdu_free(incoming_pdu_decoded); 547 incoming_pdu_decoded = NULL; 548 process_network_pdu_done(); 549 return; 550 } 551 552 // check cache 553 uint32_t hash = mesh_network_cache_hash(incoming_pdu_decoded); 554 #ifdef LOG_NETWORK 555 printf("RX-Hash (%p): %08x\n", incoming_pdu_decoded, hash); 556 #endif 557 if (mesh_network_cache_find(hash)){ 558 // found in cache, drop 559 #ifdef LOG_NETWORK 560 printf("Found in cache -> drop packet (%p)\n", incoming_pdu_decoded); 561 #endif 562 btstack_memory_mesh_network_pdu_free(incoming_pdu_decoded); 563 incoming_pdu_decoded = NULL; 564 process_network_pdu_done(); 565 return; 566 } 567 568 // store in network cache 569 mesh_network_cache_add(hash); 570 571 #ifdef LOG_NETWORK 572 printf("RX-Validated (%p) - forward to lower transport\n", incoming_pdu_decoded); 573 #endif 574 575 // forward to lower transport layer. message is freed by call to mesh_network_message_processed_by_upper_layer 576 mesh_network_pdu_t * decoded_pdu = incoming_pdu_decoded; 577 incoming_pdu_decoded = NULL; 578 (*mesh_network_higher_layer_handler)(MESH_NETWORK_PDU_RECEIVED, decoded_pdu); 579 } 580 581 // done 582 process_network_pdu_done(); 583 } 584 585 static uint32_t iv_index_for_pdu(const mesh_network_pdu_t * network_pdu){ 586 // get IV Index and IVI 587 uint32_t iv_index = mesh_get_iv_index(); 588 int ivi = network_pdu->data[0] >> 7; 589 590 // if least significant bit differs, use previous IV Index 591 if ((iv_index & 1 ) ^ ivi){ 592 iv_index--; 593 #ifdef LOG_NETWORK 594 printf("RX-IV: IVI indicates previous IV index, using 0x%08x\n", iv_index); 595 #endif 596 } 597 return iv_index; 598 } 599 600 static void process_network_pdu_validate_b(void * arg){ 601 UNUSED(arg); 602 603 #ifdef LOG_NETWORK 604 printf("RX-PECB: "); 605 printf_hexdump(obfuscation_block, 6); 606 #endif 607 608 // de-obfuscate 609 unsigned int i; 610 for (i=0;i<6;i++){ 611 incoming_pdu_decoded->data[1+i] = incoming_pdu_raw->data[1+i] ^ obfuscation_block[i]; 612 } 613 614 uint32_t iv_index = iv_index_for_pdu(incoming_pdu_raw); 615 616 if (incoming_pdu_decoded->flags & MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION){ 617 // create network nonce 618 mesh_proxy_create_nonce(network_nonce, incoming_pdu_decoded, iv_index); 619 #ifdef LOG_NETWORK 620 printf("RX-Proxy Nonce: "); 621 printf_hexdump(network_nonce, 13); 622 #endif 623 } else { 624 // create network nonce 625 mesh_network_create_nonce(network_nonce, incoming_pdu_decoded, iv_index); 626 #ifdef LOG_NETWORK 627 printf("RX-Network Nonce: "); 628 printf_hexdump(network_nonce, 13); 629 #endif 630 } 631 632 // 633 uint8_t ctl_ttl = incoming_pdu_decoded->data[1]; 634 uint8_t net_mic_len = (ctl_ttl & 0x80) ? 8 : 4; 635 uint8_t cypher_len = incoming_pdu_decoded->len - 7 - net_mic_len; 636 637 #ifdef LOG_NETWORK 638 printf("RX-Cyper len %u, mic len %u\n", cypher_len, net_mic_len); 639 640 printf("RX-Encryption Key: "); 641 printf_hexdump(current_network_key->encryption_key, 16); 642 643 #endif 644 645 btstack_crypto_ccm_init(&mesh_network_crypto_request.ccm, current_network_key->encryption_key, network_nonce, cypher_len, 0, net_mic_len); 646 btstack_crypto_ccm_decrypt_block(&mesh_network_crypto_request.ccm, cypher_len, &incoming_pdu_raw->data[7], &incoming_pdu_decoded->data[7], &process_network_pdu_validate_d, incoming_pdu_decoded); 647 } 648 649 static void process_network_pdu_validate(void){ 650 if (!mesh_network_key_nid_iterator_has_more(&validation_network_key_it)){ 651 printf("No valid network key found\n"); 652 btstack_memory_mesh_network_pdu_free(incoming_pdu_decoded); 653 incoming_pdu_decoded = NULL; 654 process_network_pdu_done(); 655 return; 656 } 657 658 current_network_key = mesh_network_key_nid_iterator_get_next(&validation_network_key_it); 659 660 // calc PECB 661 uint32_t iv_index = iv_index_for_pdu(incoming_pdu_raw); 662 memset(encryption_block, 0, 5); 663 big_endian_store_32(encryption_block, 5, iv_index); 664 memcpy(&encryption_block[9], &incoming_pdu_raw->data[7], 7); 665 btstack_crypto_aes128_encrypt(&mesh_network_crypto_request.aes128, current_network_key->privacy_key, encryption_block, obfuscation_block, &process_network_pdu_validate_b, NULL); 666 } 667 668 669 static void process_network_pdu(void){ 670 // 671 uint8_t nid_ivi = incoming_pdu_raw->data[0]; 672 673 // setup pdu object 674 incoming_pdu_decoded->data[0] = nid_ivi; 675 incoming_pdu_decoded->len = incoming_pdu_raw->len; 676 incoming_pdu_decoded->flags = incoming_pdu_raw->flags; 677 678 // init provisioning data iterator 679 uint8_t nid = nid_ivi & 0x7f; 680 // uint8_t iv_index = network_pdu_data[0] >> 7; 681 mesh_network_key_nid_iterator_init(&validation_network_key_it, nid); 682 683 process_network_pdu_validate(); 684 } 685 686 static void mesh_network_run(void){ 687 if (!btstack_linked_list_empty(&network_pdus_outgoing_gatt)){ 688 689 690 #ifdef ENABLE_MESH_GATT_BEARER 691 if (gatt_bearer_network_pdu == NULL){ 692 // move to 'gatt bearer queue' 693 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_outgoing_gatt); 694 695 #ifdef LOG_NETWORK 696 printf("network run: pop %p from network_pdus_outgoing_gatt\n", network_pdu); 697 #endif 698 // request to send via gatt if: 699 // proxy active and connected 700 // packet wasn't received via gatt bearer 701 int send_via_gatt = ((mesh_foundation_gatt_proxy_get() != 0) && 702 (gatt_bearer_con_handle != HCI_CON_HANDLE_INVALID) && 703 ((network_pdu->flags & MESH_NETWORK_PDU_FLAGS_GATT_BEARER) == 0)); 704 if (send_via_gatt){ 705 #ifdef LOG_NETWORK 706 printf("network run: set %p as gatt_bearer_network_pdu\n", network_pdu); 707 #endif 708 709 gatt_bearer_network_pdu = network_pdu; 710 gatt_bearer_request_can_send_now_for_network_pdu(); 711 } else { 712 #ifdef LOG_NETWORK 713 printf("network run: push %p to network_pdus_outgoing_adv\n", network_pdu); 714 #endif 715 btstack_linked_list_add_tail(&network_pdus_outgoing_adv, (btstack_linked_item_t *) network_pdu); 716 } 717 } 718 #else 719 // directly move to 'outgoing adv bearer queue' 720 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_outgoing_gatt); 721 btstack_linked_list_add_tail(&network_pdus_outgoing_adv, (btstack_linked_item_t *) network_pdu); 722 #endif 723 } 724 725 if (!btstack_linked_list_empty(&network_pdus_outgoing_adv)){ 726 #ifdef ENABLE_MESH_ADV_BEARER 727 if (adv_bearer_network_pdu == NULL){ 728 // move to 'adv bearer queue' 729 #ifdef LOG_NETWORK 730 mesh_network_dump_network_pdus("network_pdus_outgoing_adv", &network_pdus_outgoing_adv); 731 #endif 732 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_outgoing_adv); 733 #ifdef LOG_NETWORK 734 printf("network run: pop %p from network_pdus_outgoing_adv\n", network_pdu); 735 mesh_network_dump_network_pdus("network_pdus_outgoing_adv", &network_pdus_outgoing_adv); 736 #endif 737 adv_bearer_network_pdu = network_pdu; 738 adv_bearer_request_can_send_now_for_network_pdu(); 739 } 740 #else 741 // done 742 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_outgoing_adv); 743 // directly notify upper layer 744 mesh_network_send_complete(network_pdu); 745 #endif 746 } 747 748 if (mesh_crypto_active) return; 749 750 if (!btstack_linked_list_empty(&network_pdus_received)){ 751 incoming_pdu_decoded = mesh_network_pdu_get(); 752 if (!incoming_pdu_decoded) return; 753 // get encoded network pdu and start processing 754 mesh_crypto_active = 1; 755 incoming_pdu_raw = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_received); 756 process_network_pdu(); 757 return; 758 } 759 760 if (!btstack_linked_list_empty(&network_pdus_queued)){ 761 // get queued network pdu and start processing 762 #ifdef LOG_NETWORK 763 mesh_network_dump_network_pdus("network_pdus_queued", &network_pdus_queued); 764 #endif 765 outgoing_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_queued); 766 #ifdef LOG_NETWORK 767 printf("network run: pop %p from network_pdus_queued\n", outgoing_pdu); 768 mesh_network_dump_network_pdus("network_pdus_queued", &network_pdus_queued); 769 #endif 770 mesh_network_send_a(); 771 return; 772 } 773 } 774 775 #ifdef ENABLE_MESH_ADV_BEARER 776 static void mesh_adv_bearer_handle_network_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 777 UNUSED(channel); 778 mesh_network_pdu_t * network_pdu; 779 uint8_t transmission_count; 780 uint16_t transmission_interval; 781 uint8_t transmit_config; 782 783 switch (packet_type){ 784 case MESH_NETWORK_PACKET: 785 // check len. minimal transport PDU len = 1, 32 bit NetMIC -> 13 bytes 786 if (size < 13) break; 787 788 #ifdef LOG_NETWORK 789 printf("received network pdu from adv (len %u): ", size); 790 printf_hexdump(packet, size); 791 #endif 792 mesh_network_received_message(packet, size, 0); 793 break; 794 795 case HCI_EVENT_PACKET: 796 switch(packet[0]){ 797 case HCI_EVENT_MESH_META: 798 switch(packet[2]){ 799 case MESH_SUBEVENT_CAN_SEND_NOW: 800 if (adv_bearer_network_pdu == NULL) break; 801 802 // Get Transmission config depending on relay flag 803 if (adv_bearer_network_pdu->flags & MESH_NETWORK_PDU_FLAGS_RELAY){ 804 transmit_config = mesh_foundation_relay_get(); 805 } else { 806 transmit_config = mesh_foundation_network_transmit_get(); 807 } 808 transmission_count = (transmit_config & 0x07) + 1; 809 transmission_interval = (transmit_config >> 3) * 10; 810 811 #ifdef LOG_NETWORK 812 printf("TX-E-NetworkPDU count %u, interval %u ms (%p): ", transmission_count, transmission_interval, adv_bearer_network_pdu); 813 printf_hexdump(adv_bearer_network_pdu->data, adv_bearer_network_pdu->len); 814 #endif 815 816 adv_bearer_send_network_pdu(adv_bearer_network_pdu->data, adv_bearer_network_pdu->len, transmission_count, transmission_interval); 817 network_pdu = adv_bearer_network_pdu; 818 adv_bearer_network_pdu = NULL; 819 820 // notify upper layer 821 mesh_network_send_complete(network_pdu); 822 823 // check if more to send 824 mesh_network_run(); 825 break; 826 default: 827 break; 828 } 829 break; 830 default: 831 break; 832 } 833 break; 834 } 835 } 836 #endif 837 838 #ifdef ENABLE_MESH_GATT_BEARER 839 static void mesh_network_gatt_bearer_outgoing_complete(void){ 840 841 if (gatt_bearer_network_pdu == NULL) return; 842 843 // forward to adv bearer 844 btstack_linked_list_add_tail(&network_pdus_outgoing_adv, (btstack_linked_item_t*) gatt_bearer_network_pdu); 845 gatt_bearer_network_pdu = NULL; 846 847 mesh_network_run(); 848 return; 849 } 850 851 static void mesh_network_gatt_bearer_handle_network_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 852 UNUSED(channel); 853 switch (packet_type){ 854 case MESH_PROXY_DATA_PACKET: 855 if (mesh_foundation_gatt_proxy_get() == 0) break; 856 #ifdef LOG_NETWORK 857 printf("received network pdu from gatt (len %u): ", size); 858 printf_hexdump(packet, size); 859 #endif 860 mesh_network_received_message(packet, size, MESH_NETWORK_PDU_FLAGS_GATT_BEARER); 861 break; 862 case HCI_EVENT_PACKET: 863 switch (hci_event_packet_get_type(packet)){ 864 case HCI_EVENT_MESH_META: 865 switch (hci_event_mesh_meta_get_subevent_code(packet)){ 866 case MESH_SUBEVENT_PROXY_CONNECTED: 867 gatt_bearer_con_handle = mesh_subevent_proxy_connected_get_con_handle(packet); 868 break; 869 case MESH_SUBEVENT_PROXY_DISCONNECTED: 870 gatt_bearer_con_handle = HCI_CON_HANDLE_INVALID; 871 mesh_network_gatt_bearer_outgoing_complete(); 872 break; 873 case MESH_SUBEVENT_CAN_SEND_NOW: 874 if (gatt_bearer_network_pdu == NULL) break; 875 #ifdef LOG_NETWORK 876 printf("G-TX-E-NetworkPDU (%p): ", gatt_bearer_network_pdu); 877 printf_hexdump(gatt_bearer_network_pdu->data, gatt_bearer_network_pdu->len); 878 #endif 879 gatt_bearer_send_network_pdu(gatt_bearer_network_pdu->data, gatt_bearer_network_pdu->len); 880 break; 881 882 case MESH_SUBEVENT_MESSAGE_SENT: 883 mesh_network_gatt_bearer_outgoing_complete(); 884 break; 885 default: 886 break; 887 } 888 break; 889 default: 890 break; 891 } 892 break; 893 default: 894 break; 895 } 896 } 897 #endif 898 899 #ifdef ENABLE_MESH_GATT_BEARER 900 static void mesh_netework_gatt_bearer_handle_proxy_configuration(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 901 UNUSED(channel); 902 switch (packet_type){ 903 case MESH_PROXY_DATA_PACKET: 904 mesh_network_process_proxy_configuration_message(packet, size); 905 break; 906 case HCI_EVENT_PACKET: 907 switch (hci_event_packet_get_type(packet)){ 908 case HCI_EVENT_MESH_META: 909 switch (hci_event_mesh_meta_get_subevent_code(packet)){ 910 case MESH_SUBEVENT_CAN_SEND_NOW: 911 // forward to higher layer 912 (*mesh_network_proxy_message_handler)(MESH_NETWORK_CAN_SEND_NOW, NULL); 913 break; 914 default: 915 break; 916 } 917 break; 918 default: 919 break; 920 } 921 break; 922 default: 923 break; 924 } 925 } 926 #endif 927 928 void mesh_network_init(void){ 929 #ifdef ENABLE_MESH_ADV_BEARER 930 adv_bearer_register_for_network_pdu(&mesh_adv_bearer_handle_network_event); 931 #endif 932 #ifdef ENABLE_MESH_GATT_BEARER 933 gatt_bearer_con_handle = HCI_CON_HANDLE_INVALID; 934 gatt_bearer_register_for_network_pdu(&mesh_network_gatt_bearer_handle_network_event); 935 gatt_bearer_register_for_mesh_proxy_configuration(&mesh_netework_gatt_bearer_handle_proxy_configuration); 936 #endif 937 } 938 939 void mesh_network_set_higher_layer_handler(void (*packet_handler)(mesh_network_callback_type_t callback_type, mesh_network_pdu_t * network_pdu)){ 940 mesh_network_higher_layer_handler = packet_handler; 941 } 942 943 void mesh_network_set_proxy_message_handler(void (*packet_handler)(mesh_network_callback_type_t callback_type, mesh_network_pdu_t * network_pdu)){ 944 mesh_network_proxy_message_handler = packet_handler; 945 } 946 947 void mesh_network_received_message(const uint8_t * pdu_data, uint8_t pdu_len, uint8_t flags){ 948 // verify len 949 if (pdu_len > 29) return; 950 951 // allocate network_pdu 952 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 953 if (!network_pdu) return; 954 955 // store data 956 memcpy(network_pdu->data, pdu_data, pdu_len); 957 network_pdu->len = pdu_len; 958 network_pdu->flags = flags; 959 960 // add to list and go 961 btstack_linked_list_add_tail(&network_pdus_received, (btstack_linked_item_t *) network_pdu); 962 mesh_network_run(); 963 964 } 965 966 void mesh_network_process_proxy_configuration_message(const uint8_t * pdu_data, uint8_t pdu_len){ 967 // verify len 968 if (pdu_len > 29) return; 969 970 // allocate network_pdu 971 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 972 if (!network_pdu) return; 973 974 // store data 975 memcpy(network_pdu->data, pdu_data, pdu_len); 976 network_pdu->len = pdu_len; 977 network_pdu->flags = MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION; // Network PDU 978 979 // add to list and go 980 btstack_linked_list_add_tail(&network_pdus_received, (btstack_linked_item_t *) network_pdu); 981 mesh_network_run(); 982 } 983 984 void mesh_network_send_pdu(mesh_network_pdu_t * network_pdu){ 985 #ifdef LOG_NETWORK 986 printf("TX-NetworkPDU (%p): ", network_pdu); 987 printf_hexdump(network_pdu->data, network_pdu->len); 988 printf("^^ into network_pdus_queued\n"); 989 #endif 990 991 btstack_assert((network_pdu->len + (network_pdu->data[1] & 0x80 ? 8 : 4)) <= 29); 992 btstack_assert(network_pdu->len >= 9); 993 994 // setup callback 995 network_pdu->callback = &mesh_network_send_d; 996 network_pdu->flags = 0; 997 998 // queue up 999 btstack_linked_list_add_tail(&network_pdus_queued, (btstack_linked_item_t *) network_pdu); 1000 #ifdef LOG_NETWORK 1001 mesh_network_dump_network_pdus("network_pdus_queued", &network_pdus_queued); 1002 #endif 1003 1004 // go 1005 mesh_network_run(); 1006 } 1007 1008 void mesh_network_encrypt_proxy_configuration_message(mesh_network_pdu_t * network_pdu, void (* callback)(mesh_network_pdu_t * callback)){ 1009 printf("ProxyPDU(unencrypted): "); 1010 printf_hexdump(network_pdu->data, network_pdu->len); 1011 1012 // setup callback 1013 network_pdu->callback = callback; 1014 network_pdu->flags = MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION; 1015 1016 // queue up 1017 btstack_linked_list_add_tail(&network_pdus_queued, (btstack_linked_item_t *) network_pdu); 1018 1019 // go 1020 mesh_network_run(); 1021 } 1022 1023 /* 1024 * @brief Setup network pdu header 1025 * @param netkey_index 1026 * @param ctl 1027 * @param ttl 1028 * @param seq 1029 * @param dest 1030 */ 1031 void mesh_network_setup_pdu(mesh_network_pdu_t * network_pdu, uint16_t netkey_index, uint8_t nid, uint8_t ctl, uint8_t ttl, uint32_t seq, uint16_t src, uint16_t dest, const uint8_t * transport_pdu_data, uint8_t transport_pdu_len){ 1032 memset(network_pdu, 0, sizeof(mesh_network_pdu_t)); 1033 // set netkey_index 1034 network_pdu->netkey_index = netkey_index; 1035 // setup header 1036 network_pdu->data[network_pdu->len++] = (mesh_get_iv_index_for_tx() << 7) | nid; 1037 uint8_t ctl_ttl = (ctl << 7) | (ttl & 0x7f); 1038 network_pdu->data[network_pdu->len++] = ctl_ttl; 1039 big_endian_store_24(network_pdu->data, 2, seq); 1040 network_pdu->len += 3; 1041 big_endian_store_16(network_pdu->data, network_pdu->len, src); 1042 network_pdu->len += 2; 1043 big_endian_store_16(network_pdu->data, network_pdu->len, dest); 1044 network_pdu->len += 2; 1045 memcpy(&network_pdu->data[network_pdu->len], transport_pdu_data, transport_pdu_len); 1046 network_pdu->len += transport_pdu_len; 1047 } 1048 1049 /* 1050 * @brief Setup network pdu header 1051 * @param netkey_index 1052 * @param ctl 1053 * @param ttl 1054 * @param seq 1055 * @param dest 1056 */ 1057 void mesh_network_setup_pdu_header(mesh_network_pdu_t * network_pdu, uint16_t netkey_index, uint8_t nid, uint8_t ctl, uint8_t ttl, uint32_t seq, uint16_t src, uint16_t dest){ 1058 // set netkey_index 1059 network_pdu->netkey_index = netkey_index; 1060 // setup header 1061 network_pdu->data[0] = (mesh_get_iv_index_for_tx() << 7) | nid; 1062 uint8_t ctl_ttl = (ctl << 7) | (ttl & 0x7f); 1063 network_pdu->data[1] = ctl_ttl; 1064 big_endian_store_24(network_pdu->data, 2, seq); 1065 big_endian_store_16(network_pdu->data, 5, src); 1066 big_endian_store_16(network_pdu->data, 7, dest); 1067 } 1068 1069 // Network PDU Getter 1070 uint8_t mesh_network_nid(mesh_network_pdu_t * network_pdu){ 1071 return network_pdu->data[0] & 0x7f; 1072 } 1073 uint16_t mesh_network_control(mesh_network_pdu_t * network_pdu){ 1074 return network_pdu->data[1] & 0x80; 1075 } 1076 uint8_t mesh_network_ttl(mesh_network_pdu_t * network_pdu){ 1077 return network_pdu->data[1] & 0x7f; 1078 } 1079 uint32_t mesh_network_seq(mesh_network_pdu_t * network_pdu){ 1080 return big_endian_read_24(network_pdu->data, 2); 1081 } 1082 uint16_t mesh_network_src(mesh_network_pdu_t * network_pdu){ 1083 return big_endian_read_16(network_pdu->data, 5); 1084 } 1085 uint16_t mesh_network_dst(mesh_network_pdu_t * network_pdu){ 1086 return big_endian_read_16(network_pdu->data, 7); 1087 } 1088 int mesh_network_segmented(mesh_network_pdu_t * network_pdu){ 1089 return network_pdu->data[9] & 0x80; 1090 } 1091 uint8_t mesh_network_control_opcode(mesh_network_pdu_t * network_pdu){ 1092 return network_pdu->data[9] & 0x7f; 1093 } 1094 uint8_t * mesh_network_pdu_data(mesh_network_pdu_t * network_pdu){ 1095 return &network_pdu->data[9]; 1096 } 1097 uint8_t mesh_network_pdu_len(mesh_network_pdu_t * network_pdu){ 1098 return network_pdu->len - 9; 1099 } 1100 1101 static void mesh_network_dump_network_pdu(mesh_network_pdu_t * network_pdu){ 1102 if (network_pdu){ 1103 printf("- %p: ", network_pdu); printf_hexdump(network_pdu->data, network_pdu->len); 1104 } 1105 } 1106 static void mesh_network_dump_network_pdus(const char * name, btstack_linked_list_t * list){ 1107 printf("List: %s:\n", name); 1108 btstack_linked_list_iterator_t it; 1109 btstack_linked_list_iterator_init(&it, list); 1110 while (btstack_linked_list_iterator_has_next(&it)){ 1111 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t*) btstack_linked_list_iterator_next(&it); 1112 mesh_network_dump_network_pdu(network_pdu); 1113 } 1114 } 1115 static void mesh_network_reset_network_pdus(btstack_linked_list_t * list){ 1116 while (!btstack_linked_list_empty(list)){ 1117 mesh_network_pdu_t * pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(list); 1118 btstack_memory_mesh_network_pdu_free(pdu); 1119 } 1120 } 1121 void mesh_network_dump(void){ 1122 mesh_network_dump_network_pdus("network_pdus_received", &network_pdus_received); 1123 mesh_network_dump_network_pdus("network_pdus_queued", &network_pdus_queued); 1124 mesh_network_dump_network_pdus("network_pdus_outgoing_gatt", &network_pdus_outgoing_gatt); 1125 mesh_network_dump_network_pdus("network_pdus_outgoing_adv", &network_pdus_outgoing_adv); 1126 printf("outgoing_pdu: \n"); 1127 mesh_network_dump_network_pdu(outgoing_pdu); 1128 printf("incoming_pdu_raw: \n"); 1129 mesh_network_dump_network_pdu(incoming_pdu_raw); 1130 #ifdef ENABLE_MESH_GATT_BEARER 1131 printf("gatt_bearer_network_pdu: \n"); 1132 mesh_network_dump_network_pdu(gatt_bearer_network_pdu); 1133 #endif 1134 #ifdef ENABLE_MESH_ADV_BEARER 1135 printf("adv_bearer_network_pdu: \n"); 1136 mesh_network_dump_network_pdu(adv_bearer_network_pdu); 1137 #endif 1138 1139 } 1140 void mesh_network_reset(void){ 1141 mesh_network_reset_network_pdus(&network_pdus_received); 1142 mesh_network_reset_network_pdus(&network_pdus_queued); 1143 mesh_network_reset_network_pdus(&network_pdus_outgoing_gatt); 1144 mesh_network_reset_network_pdus(&network_pdus_outgoing_adv); 1145 1146 // outgoing network pdus are owned by higher layer, so we don't free: 1147 // - adv_bearer_network_pdu 1148 // - gatt_bearer_network_pdu 1149 // - outoing_pdu 1150 #ifdef ENABLE_MESH_ADV_BEARER 1151 adv_bearer_network_pdu = NULL; 1152 #endif 1153 #ifdef ENABLE_MESH_GATT_BEARER 1154 gatt_bearer_network_pdu = NULL; 1155 #endif 1156 outgoing_pdu = NULL; 1157 1158 if (incoming_pdu_raw){ 1159 mesh_network_pdu_free(incoming_pdu_raw); 1160 incoming_pdu_raw = NULL; 1161 } 1162 if (incoming_pdu_decoded){ 1163 mesh_network_pdu_free(incoming_pdu_decoded); 1164 incoming_pdu_decoded = NULL; 1165 } 1166 mesh_crypto_active = 0; 1167 } 1168 1169 // buffer pool 1170 mesh_network_pdu_t * mesh_network_pdu_get(void){ 1171 mesh_network_pdu_t * network_pdu = btstack_memory_mesh_network_pdu_get(); 1172 if (network_pdu) { 1173 memset(network_pdu, 0, sizeof(mesh_network_pdu_t)); 1174 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_NETWORK; 1175 } 1176 return network_pdu; 1177 } 1178 1179 void mesh_network_pdu_free(mesh_network_pdu_t * network_pdu){ 1180 btstack_memory_mesh_network_pdu_free(network_pdu); 1181 } 1182 1183 // Mesh Subnet Management 1184 1185 void mesh_subnet_add(mesh_subnet_t * subnet){ 1186 btstack_linked_list_add_tail(&subnets, (btstack_linked_item_t *) subnet); 1187 } 1188 1189 void mesh_subnet_remove(mesh_subnet_t * subnet){ 1190 btstack_linked_list_remove(&subnets, (btstack_linked_item_t *) subnet); 1191 } 1192 1193 mesh_subnet_t * mesh_subnet_get_by_netkey_index(uint16_t netkey_index){ 1194 btstack_linked_list_iterator_t it; 1195 btstack_linked_list_iterator_init(&it, &subnets); 1196 while (btstack_linked_list_iterator_has_next(&it)){ 1197 mesh_subnet_t * item = (mesh_subnet_t *) btstack_linked_list_iterator_next(&it); 1198 if (item->netkey_index == netkey_index) return item; 1199 } 1200 return NULL; 1201 } 1202 1203 int mesh_subnet_list_count(void){ 1204 return btstack_linked_list_count(&subnets); 1205 } 1206 1207 // mesh network key iterator over all keys 1208 void mesh_subnet_iterator_init(mesh_subnet_iterator_t *it){ 1209 btstack_linked_list_iterator_init(&it->it, &subnets); 1210 } 1211 1212 int mesh_subnet_iterator_has_more(mesh_subnet_iterator_t *it){ 1213 return btstack_linked_list_iterator_has_next(&it->it); 1214 } 1215 1216 mesh_subnet_t * mesh_subnet_iterator_get_next(mesh_subnet_iterator_t *it){ 1217 return (mesh_subnet_t *) btstack_linked_list_iterator_next(&it->it); 1218 } 1219 1220 mesh_network_key_t * mesh_subnet_get_outgoing_network_key(mesh_subnet_t * subnet){ 1221 switch (subnet->key_refresh){ 1222 case MESH_KEY_REFRESH_SECOND_PHASE: 1223 return subnet->new_key; 1224 case MESH_KEY_REFRESH_NOT_ACTIVE: 1225 case MESH_KEY_REFRESH_FIRST_PHASE: 1226 default: 1227 return subnet->old_key; 1228 } 1229 } 1230 1231 /** 1232 * @brief Setup subnet for given netkey index 1233 */ 1234 void mesh_subnet_setup_for_netkey_index(uint16_t netkey_index){ 1235 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 1236 if (subnet != NULL) return; 1237 1238 // find old / new keys 1239 mesh_network_key_t * old_key = NULL; 1240 mesh_network_key_t * new_key = NULL; 1241 mesh_network_key_iterator_t it; 1242 mesh_network_key_iterator_init(&it); 1243 while (mesh_network_key_iterator_has_more(&it)){ 1244 mesh_network_key_t * network_key = mesh_network_key_iterator_get_next(&it); 1245 if (network_key->netkey_index != netkey_index) continue; 1246 if (old_key == NULL){ 1247 old_key = network_key; 1248 continue; 1249 } 1250 // assign current key depending on key version 1251 if (((int8_t) (network_key->version - new_key->version)) > 0) { 1252 new_key = network_key; 1253 } else { 1254 new_key = old_key; 1255 old_key = network_key; 1256 } 1257 } 1258 1259 // create subnet for netkey index 1260 subnet = btstack_memory_mesh_subnet_get(); 1261 if (subnet == NULL) return; 1262 subnet->netkey_index = netkey_index; 1263 mesh_subnet_add(subnet); 1264 1265 // set keys 1266 subnet->old_key = old_key; 1267 subnet->new_key = new_key; 1268 1269 // key refresh 1270 if (new_key == NULL){ 1271 // single key -> key refresh not active 1272 subnet->key_refresh = MESH_KEY_REFRESH_NOT_ACTIVE; 1273 } 1274 else { 1275 // two keys -> at least phase 1 1276 subnet->key_refresh = MESH_KEY_REFRESH_FIRST_PHASE; 1277 } 1278 } 1279