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 #ifdef LOG_NETWORK 328 printf("TX-B-NetworkPDU (%p): ", outgoing_pdu); 329 printf_hexdump(outgoing_pdu->data, outgoing_pdu->len); 330 #endif 331 332 // calc PECB 333 memset(encryption_block, 0, 5); 334 big_endian_store_32(encryption_block, 5, iv_index); 335 memcpy(&encryption_block[9], &outgoing_pdu->data[7], 7); 336 btstack_crypto_aes128_encrypt(&mesh_network_crypto_request.aes128, current_network_key->privacy_key, encryption_block, obfuscation_block, &mesh_network_send_c, NULL); 337 } 338 339 static void mesh_network_send_a(void){ 340 341 mesh_crypto_active = 1; 342 343 uint32_t iv_index = mesh_get_iv_index_for_tx(); 344 345 // lookup subnet by netkey_index 346 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(outgoing_pdu->netkey_index); 347 if (!subnet) { 348 mesh_crypto_active = 0; 349 mesh_network_pdu_t * network_pdu = outgoing_pdu; 350 outgoing_pdu = NULL; 351 // notify upper layer 352 mesh_network_send_complete(network_pdu); 353 // run again 354 mesh_network_run(); 355 return; 356 } 357 358 // get network key to use for sending 359 current_network_key = mesh_subnet_get_outgoing_network_key(subnet); 360 361 #ifdef LOG_NETWORK 362 printf("TX-A-NetworkPDU (%p): ", outgoing_pdu); 363 printf_hexdump(outgoing_pdu->data, outgoing_pdu->len); 364 #endif 365 366 // get network nonce 367 if (outgoing_pdu->flags & MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION){ 368 mesh_proxy_create_nonce(network_nonce, outgoing_pdu, iv_index); 369 #ifdef LOG_NETWORK 370 printf("TX-ProxyNonce: "); 371 printf_hexdump(network_nonce, 13); 372 #endif 373 } else { 374 mesh_network_create_nonce(network_nonce, outgoing_pdu, iv_index); 375 #ifdef LOG_NETWORK 376 printf("TX-NetworkNonce: "); 377 printf_hexdump(network_nonce, 13); 378 #endif 379 } 380 381 #ifdef LOG_NETWORK 382 printf("TX-EncryptionKey: "); 383 printf_hexdump(current_network_key->encryption_key, 16); 384 #endif 385 386 // start ccm 387 uint8_t cypher_len = outgoing_pdu->len - 7; 388 uint8_t net_mic_len = outgoing_pdu->data[1] & 0x80 ? 8 : 4; 389 btstack_crypto_ccm_init(&mesh_network_crypto_request.ccm, current_network_key->encryption_key, network_nonce, cypher_len, 0, net_mic_len); 390 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); 391 } 392 393 #if defined(ENABLE_MESH_RELAY) || defined (ENABLE_MESH_PROXY_SERVER) 394 static void mesh_network_relay_message(mesh_network_pdu_t * network_pdu){ 395 396 uint8_t ctl_ttl = network_pdu->data[1]; 397 uint8_t ctl = ctl_ttl & 0x80; 398 uint8_t ttl = ctl_ttl & 0x7f; 399 400 #ifdef LOG_NETWORK 401 printf("TX-Relay-NetworkPDU (%p): ", network_pdu); 402 printf_hexdump(network_pdu->data, network_pdu->len); 403 printf("^^ into network_pdus_queued\n"); 404 #endif 405 406 // prepare pdu for resending 407 network_pdu->data[1] = (ctl << 7) | (ttl - 1); 408 network_pdu->flags |= MESH_NETWORK_PDU_FLAGS_RELAY; 409 410 // queue up 411 network_pdu->callback = &mesh_network_send_d; 412 btstack_linked_list_add_tail(&network_pdus_queued, (btstack_linked_item_t *) network_pdu); 413 } 414 #endif 415 416 void mesh_network_message_processed_by_higher_layer(mesh_network_pdu_t * network_pdu){ 417 418 #if defined(ENABLE_MESH_RELAY) || defined (ENABLE_MESH_PROXY_SERVER) 419 420 // check if address does not matches elements on our node and TTL >= 2 421 uint16_t src = mesh_network_src(network_pdu); 422 uint8_t ttl = mesh_network_ttl(network_pdu); 423 424 uint16_t mesh_network_primary_address = mesh_node_get_primary_element_address(); 425 426 if (((src < mesh_network_primary_address) || (src > (mesh_network_primary_address + mesh_node_element_count()))) && (ttl >= 2)){ 427 428 if ((network_pdu->flags & MESH_NETWORK_PDU_FLAGS_GATT_BEARER) == 0){ 429 430 // message received via ADV bearer are relayed: 431 432 #ifdef ENABLE_MESH_RELAY 433 if (mesh_foundation_relay_get() != 0){ 434 // - to ADV bearer, if Relay supported and enabled 435 mesh_network_relay_message(network_pdu); 436 mesh_network_run(); 437 return; 438 } 439 #endif 440 441 #ifdef ENABLE_MESH_PROXY_SERVER 442 if (mesh_foundation_gatt_proxy_get() != 0){ 443 // - to GATT bearer, if Proxy supported and enabled 444 mesh_network_relay_message(network_pdu); 445 mesh_network_run(); 446 return; 447 } 448 #endif 449 450 } else { 451 452 // messages received via GATT bearer are relayed: 453 454 #ifdef ENABLE_MESH_PROXY_SERVER 455 if (mesh_foundation_gatt_proxy_get() != 0){ 456 // - to ADV bearer, if Proxy supported and enabled 457 mesh_network_relay_message(network_pdu); 458 mesh_network_run(); 459 return; 460 } 461 #endif 462 463 } 464 } 465 #endif 466 467 // otherwise, we're done 468 btstack_memory_mesh_network_pdu_free(network_pdu); 469 } 470 471 static void process_network_pdu_done(void){ 472 btstack_memory_mesh_network_pdu_free(incoming_pdu_raw); 473 incoming_pdu_raw = NULL; 474 mesh_crypto_active = 0; 475 476 mesh_network_run(); 477 } 478 479 static void process_network_pdu_validate_d(void * arg){ 480 UNUSED(arg); 481 // mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) arg; 482 483 uint8_t ctl_ttl = incoming_pdu_decoded->data[1]; 484 uint8_t ctl = ctl_ttl >> 7; 485 uint8_t net_mic_len = (ctl_ttl & 0x80) ? 8 : 4; 486 487 // store NetMIC 488 uint8_t net_mic[8]; 489 btstack_crypto_ccm_get_authentication_value(&mesh_network_crypto_request.ccm, net_mic); 490 #ifdef LOG_NETWORK 491 printf("RX-NetMIC: "); 492 printf_hexdump(net_mic, net_mic_len); 493 #endif 494 // store in decoded pdu 495 memcpy(&incoming_pdu_decoded->data[incoming_pdu_decoded->len-net_mic_len], net_mic, net_mic_len); 496 497 #ifdef LOG_NETWORK 498 uint8_t cypher_len = incoming_pdu_decoded->len - 9 - net_mic_len; 499 printf("RX-Decrypted DST/TransportPDU: "); 500 printf_hexdump(&incoming_pdu_decoded->data[7], 2 + cypher_len); 501 502 printf("RX-Decrypted: "); 503 printf_hexdump(incoming_pdu_decoded->data, incoming_pdu_decoded->len); 504 #endif 505 506 // validate network mic 507 if (memcmp(net_mic, &incoming_pdu_raw->data[incoming_pdu_decoded->len-net_mic_len], net_mic_len) != 0){ 508 // fail 509 printf("RX-NetMIC mismatch, try next key\n"); 510 process_network_pdu_validate(); 511 return; 512 } 513 514 // remove NetMIC from payload 515 incoming_pdu_decoded->len -= net_mic_len; 516 517 #ifdef LOG_NETWORK 518 // match 519 printf("RX-NetMIC matches\n"); 520 printf("RX-TTL: 0x%02x\n", incoming_pdu_decoded->data[1] & 0x7f); 521 #endif 522 523 // set netkey_index 524 incoming_pdu_decoded->netkey_index = current_network_key->netkey_index; 525 526 if (incoming_pdu_decoded->flags & MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION){ 527 528 mesh_network_pdu_t * decoded_pdu = incoming_pdu_decoded; 529 incoming_pdu_decoded = NULL; 530 531 // no additional checks for proxy messages 532 (*mesh_network_proxy_message_handler)(MESH_NETWORK_PDU_RECEIVED, decoded_pdu); 533 534 } else { 535 536 // validate src/dest addresses 537 uint16_t src = big_endian_read_16(incoming_pdu_decoded->data, 5); 538 uint16_t dst = big_endian_read_16(incoming_pdu_decoded->data, 7); 539 int valid = mesh_network_addresses_valid(ctl, src, dst); 540 if (!valid){ 541 printf("RX Address invalid\n"); 542 btstack_memory_mesh_network_pdu_free(incoming_pdu_decoded); 543 incoming_pdu_decoded = NULL; 544 process_network_pdu_done(); 545 return; 546 } 547 548 // check cache 549 uint32_t hash = mesh_network_cache_hash(incoming_pdu_decoded); 550 #ifdef LOG_NETWORK 551 printf("RX-Hash: %08x\n", hash); 552 #endif 553 if (mesh_network_cache_find(hash)){ 554 // found in cache, drop 555 printf("Found in cache -> drop packet\n"); 556 btstack_memory_mesh_network_pdu_free(incoming_pdu_decoded); 557 incoming_pdu_decoded = NULL; 558 process_network_pdu_done(); 559 return; 560 } 561 562 // store in network cache 563 mesh_network_cache_add(hash); 564 565 // forward to lower transport layer. message is freed by call to mesh_network_message_processed_by_upper_layer 566 mesh_network_pdu_t * decoded_pdu = incoming_pdu_decoded; 567 incoming_pdu_decoded = NULL; 568 (*mesh_network_higher_layer_handler)(MESH_NETWORK_PDU_RECEIVED, decoded_pdu); 569 } 570 571 // done 572 process_network_pdu_done(); 573 } 574 575 static uint32_t iv_index_for_pdu(const mesh_network_pdu_t * network_pdu){ 576 // get IV Index and IVI 577 uint32_t iv_index = mesh_get_iv_index(); 578 int ivi = network_pdu->data[0] >> 7; 579 580 // if least significant bit differs, use previous IV Index 581 if ((iv_index & 1 ) ^ ivi){ 582 iv_index--; 583 #ifdef LOG_NETWORK 584 printf("RX-IV: IVI indicates previous IV index, using 0x%08x\n", iv_index); 585 #endif 586 } 587 return iv_index; 588 } 589 590 static void process_network_pdu_validate_b(void * arg){ 591 UNUSED(arg); 592 593 #ifdef LOG_NETWORK 594 printf("RX-PECB: "); 595 printf_hexdump(obfuscation_block, 6); 596 #endif 597 598 // de-obfuscate 599 unsigned int i; 600 for (i=0;i<6;i++){ 601 incoming_pdu_decoded->data[1+i] = incoming_pdu_raw->data[1+i] ^ obfuscation_block[i]; 602 } 603 604 uint32_t iv_index = iv_index_for_pdu(incoming_pdu_raw); 605 606 if (incoming_pdu_decoded->flags & MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION){ 607 // create network nonce 608 mesh_proxy_create_nonce(network_nonce, incoming_pdu_decoded, iv_index); 609 #ifdef LOG_NETWORK 610 printf("RX-Proxy Nonce: "); 611 printf_hexdump(network_nonce, 13); 612 #endif 613 } else { 614 // create network nonce 615 mesh_network_create_nonce(network_nonce, incoming_pdu_decoded, iv_index); 616 #ifdef LOG_NETWORK 617 printf("RX-Network Nonce: "); 618 printf_hexdump(network_nonce, 13); 619 #endif 620 } 621 622 // 623 uint8_t ctl_ttl = incoming_pdu_decoded->data[1]; 624 uint8_t net_mic_len = (ctl_ttl & 0x80) ? 8 : 4; 625 uint8_t cypher_len = incoming_pdu_decoded->len - 7 - net_mic_len; 626 627 #ifdef LOG_NETWORK 628 printf("RX-Cyper len %u, mic len %u\n", cypher_len, net_mic_len); 629 630 printf("RX-Encryption Key: "); 631 printf_hexdump(current_network_key->encryption_key, 16); 632 633 #endif 634 635 btstack_crypto_ccm_init(&mesh_network_crypto_request.ccm, current_network_key->encryption_key, network_nonce, cypher_len, 0, net_mic_len); 636 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); 637 } 638 639 static void process_network_pdu_validate(void){ 640 if (!mesh_network_key_nid_iterator_has_more(&validation_network_key_it)){ 641 printf("No valid network key found\n"); 642 btstack_memory_mesh_network_pdu_free(incoming_pdu_decoded); 643 incoming_pdu_decoded = NULL; 644 process_network_pdu_done(); 645 return; 646 } 647 648 current_network_key = mesh_network_key_nid_iterator_get_next(&validation_network_key_it); 649 650 // calc PECB 651 uint32_t iv_index = iv_index_for_pdu(incoming_pdu_raw); 652 memset(encryption_block, 0, 5); 653 big_endian_store_32(encryption_block, 5, iv_index); 654 memcpy(&encryption_block[9], &incoming_pdu_raw->data[7], 7); 655 btstack_crypto_aes128_encrypt(&mesh_network_crypto_request.aes128, current_network_key->privacy_key, encryption_block, obfuscation_block, &process_network_pdu_validate_b, NULL); 656 } 657 658 659 static void process_network_pdu(void){ 660 // 661 uint8_t nid_ivi = incoming_pdu_raw->data[0]; 662 663 // setup pdu object 664 incoming_pdu_decoded->data[0] = nid_ivi; 665 incoming_pdu_decoded->len = incoming_pdu_raw->len; 666 incoming_pdu_decoded->flags = incoming_pdu_raw->flags; 667 668 // init provisioning data iterator 669 uint8_t nid = nid_ivi & 0x7f; 670 // uint8_t iv_index = network_pdu_data[0] >> 7; 671 mesh_network_key_nid_iterator_init(&validation_network_key_it, nid); 672 673 process_network_pdu_validate(); 674 } 675 676 static void mesh_network_run(void){ 677 if (!btstack_linked_list_empty(&network_pdus_outgoing_gatt)){ 678 679 680 #ifdef ENABLE_MESH_GATT_BEARER 681 if (gatt_bearer_network_pdu == NULL){ 682 // move to 'gatt bearer queue' 683 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_outgoing_gatt); 684 685 #ifdef LOG_NETWORK 686 printf("network run: pop %p from network_pdus_outgoing_gatt\n", network_pdu); 687 #endif 688 // request to send via gatt if: 689 // proxy active and connected 690 // packet wasn't received via gatt bearer 691 int send_via_gatt = ((mesh_foundation_gatt_proxy_get() != 0) && 692 (gatt_bearer_con_handle != HCI_CON_HANDLE_INVALID) && 693 ((network_pdu->flags & MESH_NETWORK_PDU_FLAGS_GATT_BEARER) == 0)); 694 if (send_via_gatt){ 695 #ifdef LOG_NETWORK 696 printf("network run: set %p as gatt_bearer_network_pdu\n", network_pdu); 697 #endif 698 699 gatt_bearer_network_pdu = network_pdu; 700 gatt_bearer_request_can_send_now_for_network_pdu(); 701 } else { 702 #ifdef LOG_NETWORK 703 printf("network run: push %p to network_pdus_outgoing_adv\n", network_pdu); 704 #endif 705 btstack_linked_list_add_tail(&network_pdus_outgoing_adv, (btstack_linked_item_t *) network_pdu); 706 } 707 } 708 #else 709 // directly move to 'outgoing adv bearer queue' 710 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_outgoing_gatt); 711 btstack_linked_list_add_tail(&network_pdus_outgoing_adv, (btstack_linked_item_t *) network_pdu); 712 #endif 713 } 714 715 if (!btstack_linked_list_empty(&network_pdus_outgoing_adv)){ 716 #ifdef ENABLE_MESH_ADV_BEARER 717 if (adv_bearer_network_pdu == NULL){ 718 // move to 'adv bearer queue' 719 #ifdef LOG_NETWORK 720 mesh_network_dump_network_pdus("network_pdus_outgoing_adv", &network_pdus_outgoing_adv); 721 #endif 722 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_outgoing_adv); 723 #ifdef LOG_NETWORK 724 printf("network run: pop %p from network_pdus_outgoing_adv\n", network_pdu); 725 mesh_network_dump_network_pdus("network_pdus_outgoing_adv", &network_pdus_outgoing_adv); 726 #endif 727 adv_bearer_network_pdu = network_pdu; 728 adv_bearer_request_can_send_now_for_network_pdu(); 729 } 730 #else 731 // done 732 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_outgoing_adv); 733 // directly notify upper layer 734 mesh_network_send_complete(network_pdu); 735 #endif 736 } 737 738 if (mesh_crypto_active) return; 739 740 if (!btstack_linked_list_empty(&network_pdus_received)){ 741 incoming_pdu_decoded = mesh_network_pdu_get(); 742 if (!incoming_pdu_decoded) return; 743 // get encoded network pdu and start processing 744 mesh_crypto_active = 1; 745 incoming_pdu_raw = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_received); 746 process_network_pdu(); 747 return; 748 } 749 750 if (!btstack_linked_list_empty(&network_pdus_queued)){ 751 // get queued network pdu and start processing 752 #ifdef LOG_NETWORK 753 mesh_network_dump_network_pdus("network_pdus_queued", &network_pdus_queued); 754 #endif 755 outgoing_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_queued); 756 #ifdef LOG_NETWORK 757 printf("network run: pop %p from network_pdus_queued\n", outgoing_pdu); 758 mesh_network_dump_network_pdus("network_pdus_queued", &network_pdus_queued); 759 #endif 760 mesh_network_send_a(); 761 return; 762 } 763 } 764 765 #ifdef ENABLE_MESH_ADV_BEARER 766 static void mesh_adv_bearer_handle_network_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 767 UNUSED(channel); 768 mesh_network_pdu_t * network_pdu; 769 uint8_t transmission_count; 770 uint16_t transmission_interval; 771 uint8_t transmit_config; 772 773 switch (packet_type){ 774 case MESH_NETWORK_PACKET: 775 // check len. minimal transport PDU len = 1, 32 bit NetMIC -> 13 bytes 776 if (size < 13) break; 777 778 #ifdef LOG_NETWORK 779 printf("received network pdu from adv (len %u): ", size); 780 printf_hexdump(packet, size); 781 #endif 782 mesh_network_received_message(packet, size, 0); 783 break; 784 785 case HCI_EVENT_PACKET: 786 switch(packet[0]){ 787 case HCI_EVENT_MESH_META: 788 switch(packet[2]){ 789 case MESH_SUBEVENT_CAN_SEND_NOW: 790 if (adv_bearer_network_pdu == NULL) break; 791 792 // Get Transmission config depending on relay flag 793 if (adv_bearer_network_pdu->flags & MESH_NETWORK_PDU_FLAGS_RELAY){ 794 transmit_config = mesh_foundation_relay_get(); 795 } else { 796 transmit_config = mesh_foundation_network_transmit_get(); 797 } 798 transmission_count = (transmit_config & 0x07) + 1; 799 transmission_interval = (transmit_config >> 3) * 10; 800 801 #ifdef LOG_NETWORK 802 printf("TX-E-NetworkPDU count %u, interval %u ms (%p): ", transmission_count, transmission_interval, adv_bearer_network_pdu); 803 printf_hexdump(adv_bearer_network_pdu->data, adv_bearer_network_pdu->len); 804 #endif 805 806 adv_bearer_send_network_pdu(adv_bearer_network_pdu->data, adv_bearer_network_pdu->len, transmission_count, transmission_interval); 807 network_pdu = adv_bearer_network_pdu; 808 adv_bearer_network_pdu = NULL; 809 810 // notify upper layer 811 mesh_network_send_complete(network_pdu); 812 813 // check if more to send 814 mesh_network_run(); 815 break; 816 default: 817 break; 818 } 819 break; 820 default: 821 break; 822 } 823 break; 824 } 825 } 826 #endif 827 828 #ifdef ENABLE_MESH_GATT_BEARER 829 static void mesh_network_gatt_bearer_outgoing_complete(void){ 830 831 if (gatt_bearer_network_pdu == NULL) return; 832 833 // forward to adv bearer 834 btstack_linked_list_add_tail(&network_pdus_outgoing_adv, (btstack_linked_item_t*) gatt_bearer_network_pdu); 835 gatt_bearer_network_pdu = NULL; 836 837 mesh_network_run(); 838 return; 839 } 840 841 static void mesh_network_gatt_bearer_handle_network_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 842 UNUSED(channel); 843 switch (packet_type){ 844 case MESH_PROXY_DATA_PACKET: 845 if (mesh_foundation_gatt_proxy_get() == 0) break; 846 #ifdef LOG_NETWORK 847 printf("received network pdu from gatt (len %u): ", size); 848 printf_hexdump(packet, size); 849 #endif 850 mesh_network_received_message(packet, size, MESH_NETWORK_PDU_FLAGS_GATT_BEARER); 851 break; 852 case HCI_EVENT_PACKET: 853 switch (hci_event_packet_get_type(packet)){ 854 case HCI_EVENT_MESH_META: 855 switch (hci_event_mesh_meta_get_subevent_code(packet)){ 856 case MESH_SUBEVENT_PROXY_CONNECTED: 857 gatt_bearer_con_handle = mesh_subevent_proxy_connected_get_con_handle(packet); 858 break; 859 case MESH_SUBEVENT_PROXY_DISCONNECTED: 860 gatt_bearer_con_handle = HCI_CON_HANDLE_INVALID; 861 mesh_network_gatt_bearer_outgoing_complete(); 862 break; 863 case MESH_SUBEVENT_CAN_SEND_NOW: 864 if (gatt_bearer_network_pdu == NULL) break; 865 #ifdef LOG_NETWORK 866 printf("G-TX-E-NetworkPDU (%p): ", gatt_bearer_network_pdu); 867 printf_hexdump(gatt_bearer_network_pdu->data, gatt_bearer_network_pdu->len); 868 #endif 869 gatt_bearer_send_network_pdu(gatt_bearer_network_pdu->data, gatt_bearer_network_pdu->len); 870 break; 871 872 case MESH_SUBEVENT_MESSAGE_SENT: 873 mesh_network_gatt_bearer_outgoing_complete(); 874 break; 875 default: 876 break; 877 } 878 break; 879 default: 880 break; 881 } 882 break; 883 default: 884 break; 885 } 886 } 887 #endif 888 889 #ifdef ENABLE_MESH_GATT_BEARER 890 static void mesh_netework_gatt_bearer_handle_proxy_configuration(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 891 UNUSED(channel); 892 switch (packet_type){ 893 case MESH_PROXY_DATA_PACKET: 894 mesh_network_process_proxy_configuration_message(packet, size); 895 break; 896 case HCI_EVENT_PACKET: 897 switch (hci_event_packet_get_type(packet)){ 898 case HCI_EVENT_MESH_META: 899 switch (hci_event_mesh_meta_get_subevent_code(packet)){ 900 case MESH_SUBEVENT_CAN_SEND_NOW: 901 // forward to higher layer 902 (*mesh_network_proxy_message_handler)(MESH_NETWORK_CAN_SEND_NOW, NULL); 903 break; 904 default: 905 break; 906 } 907 break; 908 default: 909 break; 910 } 911 break; 912 default: 913 break; 914 } 915 } 916 #endif 917 918 void mesh_network_init(void){ 919 #ifdef ENABLE_MESH_ADV_BEARER 920 adv_bearer_register_for_network_pdu(&mesh_adv_bearer_handle_network_event); 921 #endif 922 #ifdef ENABLE_MESH_GATT_BEARER 923 gatt_bearer_con_handle = HCI_CON_HANDLE_INVALID; 924 gatt_bearer_register_for_network_pdu(&mesh_network_gatt_bearer_handle_network_event); 925 gatt_bearer_register_for_mesh_proxy_configuration(&mesh_netework_gatt_bearer_handle_proxy_configuration); 926 #endif 927 } 928 929 void mesh_network_set_higher_layer_handler(void (*packet_handler)(mesh_network_callback_type_t callback_type, mesh_network_pdu_t * network_pdu)){ 930 mesh_network_higher_layer_handler = packet_handler; 931 } 932 933 void mesh_network_set_proxy_message_handler(void (*packet_handler)(mesh_network_callback_type_t callback_type, mesh_network_pdu_t * network_pdu)){ 934 mesh_network_proxy_message_handler = packet_handler; 935 } 936 937 void mesh_network_received_message(const uint8_t * pdu_data, uint8_t pdu_len, uint8_t flags){ 938 // verify len 939 if (pdu_len > 29) return; 940 941 // allocate network_pdu 942 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 943 if (!network_pdu) return; 944 945 // store data 946 memcpy(network_pdu->data, pdu_data, pdu_len); 947 network_pdu->len = pdu_len; 948 network_pdu->flags = flags; 949 950 // add to list and go 951 btstack_linked_list_add_tail(&network_pdus_received, (btstack_linked_item_t *) network_pdu); 952 mesh_network_run(); 953 954 } 955 956 void mesh_network_process_proxy_configuration_message(const uint8_t * pdu_data, uint8_t pdu_len){ 957 // verify len 958 if (pdu_len > 29) return; 959 960 // allocate network_pdu 961 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 962 if (!network_pdu) return; 963 964 // store data 965 memcpy(network_pdu->data, pdu_data, pdu_len); 966 network_pdu->len = pdu_len; 967 network_pdu->flags = MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION; // Network PDU 968 969 // add to list and go 970 btstack_linked_list_add_tail(&network_pdus_received, (btstack_linked_item_t *) network_pdu); 971 mesh_network_run(); 972 } 973 974 void mesh_network_send_pdu(mesh_network_pdu_t * network_pdu){ 975 #ifdef LOG_NETWORK 976 printf("TX-NetworkPDU (%p): ", network_pdu); 977 printf_hexdump(network_pdu->data, network_pdu->len); 978 printf("^^ into network_pdus_queued\n"); 979 #endif 980 981 if (network_pdu->len > 29){ 982 printf("too long, %u\n", network_pdu->len); 983 while(1); 984 } 985 986 // network pdu without payload and minimal mic = 13 bytes 987 if (network_pdu->len <13){ 988 printf("too short, %u\n", network_pdu->len); 989 while(1); 990 } 991 992 // setup callback 993 network_pdu->callback = &mesh_network_send_d; 994 network_pdu->flags = 0; 995 996 // queue up 997 btstack_linked_list_add_tail(&network_pdus_queued, (btstack_linked_item_t *) network_pdu); 998 #ifdef LOG_NETWORK 999 mesh_network_dump_network_pdus("network_pdus_queued", &network_pdus_queued); 1000 #endif 1001 1002 // go 1003 mesh_network_run(); 1004 } 1005 1006 void mesh_network_encrypt_proxy_configuration_message(mesh_network_pdu_t * network_pdu, void (* callback)(mesh_network_pdu_t * callback)){ 1007 printf("ProxyPDU(unencrypted): "); 1008 printf_hexdump(network_pdu->data, network_pdu->len); 1009 1010 // setup callback 1011 network_pdu->callback = callback; 1012 network_pdu->flags = MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION; 1013 1014 // queue up 1015 btstack_linked_list_add_tail(&network_pdus_queued, (btstack_linked_item_t *) network_pdu); 1016 1017 // go 1018 mesh_network_run(); 1019 } 1020 1021 /* 1022 * @brief Setup network pdu header 1023 * @param netkey_index 1024 * @param ctl 1025 * @param ttl 1026 * @param seq 1027 * @param dest 1028 */ 1029 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){ 1030 memset(network_pdu, 0, sizeof(mesh_network_pdu_t)); 1031 // set netkey_index 1032 network_pdu->netkey_index = netkey_index; 1033 // setup header 1034 network_pdu->data[network_pdu->len++] = (mesh_get_iv_index_for_tx() << 7) | nid; 1035 uint8_t ctl_ttl = (ctl << 7) | (ttl & 0x7f); 1036 network_pdu->data[network_pdu->len++] = ctl_ttl; 1037 big_endian_store_24(network_pdu->data, 2, seq); 1038 network_pdu->len += 3; 1039 big_endian_store_16(network_pdu->data, network_pdu->len, src); 1040 network_pdu->len += 2; 1041 big_endian_store_16(network_pdu->data, network_pdu->len, dest); 1042 network_pdu->len += 2; 1043 memcpy(&network_pdu->data[network_pdu->len], transport_pdu_data, transport_pdu_len); 1044 network_pdu->len += transport_pdu_len; 1045 } 1046 1047 /* 1048 * @brief Setup network pdu header 1049 * @param netkey_index 1050 * @param ctl 1051 * @param ttl 1052 * @param seq 1053 * @param dest 1054 */ 1055 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){ 1056 // set netkey_index 1057 network_pdu->netkey_index = netkey_index; 1058 // setup header 1059 network_pdu->data[0] = (mesh_get_iv_index_for_tx() << 7) | nid; 1060 uint8_t ctl_ttl = (ctl << 7) | (ttl & 0x7f); 1061 network_pdu->data[1] = ctl_ttl; 1062 big_endian_store_24(network_pdu->data, 2, seq); 1063 big_endian_store_16(network_pdu->data, 5, src); 1064 big_endian_store_16(network_pdu->data, 7, dest); 1065 } 1066 1067 // Network PDU Getter 1068 uint8_t mesh_network_nid(mesh_network_pdu_t * network_pdu){ 1069 return network_pdu->data[0] & 0x7f; 1070 } 1071 uint16_t mesh_network_control(mesh_network_pdu_t * network_pdu){ 1072 return network_pdu->data[1] & 0x80; 1073 } 1074 uint8_t mesh_network_ttl(mesh_network_pdu_t * network_pdu){ 1075 return network_pdu->data[1] & 0x7f; 1076 } 1077 uint32_t mesh_network_seq(mesh_network_pdu_t * network_pdu){ 1078 return big_endian_read_24(network_pdu->data, 2); 1079 } 1080 uint16_t mesh_network_src(mesh_network_pdu_t * network_pdu){ 1081 return big_endian_read_16(network_pdu->data, 5); 1082 } 1083 uint16_t mesh_network_dst(mesh_network_pdu_t * network_pdu){ 1084 return big_endian_read_16(network_pdu->data, 7); 1085 } 1086 int mesh_network_segmented(mesh_network_pdu_t * network_pdu){ 1087 return network_pdu->data[9] & 0x80; 1088 } 1089 uint8_t mesh_network_control_opcode(mesh_network_pdu_t * network_pdu){ 1090 return network_pdu->data[9] & 0x7f; 1091 } 1092 uint8_t * mesh_network_pdu_data(mesh_network_pdu_t * network_pdu){ 1093 return &network_pdu->data[9]; 1094 } 1095 uint8_t mesh_network_pdu_len(mesh_network_pdu_t * network_pdu){ 1096 return network_pdu->len - 9; 1097 } 1098 1099 static void mesh_network_dump_network_pdu(mesh_network_pdu_t * network_pdu){ 1100 if (network_pdu){ 1101 printf("- %p: ", network_pdu); printf_hexdump(network_pdu->data, network_pdu->len); 1102 } 1103 } 1104 static void mesh_network_dump_network_pdus(const char * name, btstack_linked_list_t * list){ 1105 printf("List: %s:\n", name); 1106 btstack_linked_list_iterator_t it; 1107 btstack_linked_list_iterator_init(&it, list); 1108 while (btstack_linked_list_iterator_has_next(&it)){ 1109 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t*) btstack_linked_list_iterator_next(&it); 1110 mesh_network_dump_network_pdu(network_pdu); 1111 } 1112 } 1113 static void mesh_network_reset_network_pdus(btstack_linked_list_t * list){ 1114 while (!btstack_linked_list_empty(list)){ 1115 mesh_network_pdu_t * pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(list); 1116 btstack_memory_mesh_network_pdu_free(pdu); 1117 } 1118 } 1119 void mesh_network_dump(void){ 1120 mesh_network_dump_network_pdus("network_pdus_received", &network_pdus_received); 1121 mesh_network_dump_network_pdus("network_pdus_queued", &network_pdus_queued); 1122 mesh_network_dump_network_pdus("network_pdus_outgoing_gatt", &network_pdus_outgoing_gatt); 1123 mesh_network_dump_network_pdus("network_pdus_outgoing_adv", &network_pdus_outgoing_adv); 1124 printf("outgoing_pdu: \n"); 1125 mesh_network_dump_network_pdu(outgoing_pdu); 1126 printf("incoming_pdu_raw: \n"); 1127 mesh_network_dump_network_pdu(incoming_pdu_raw); 1128 printf("gatt_bearer_network_pdu: \n"); 1129 mesh_network_dump_network_pdu(gatt_bearer_network_pdu); 1130 printf("adv_bearer_network_pdu: \n"); 1131 mesh_network_dump_network_pdu(adv_bearer_network_pdu); 1132 } 1133 void mesh_network_reset(void){ 1134 mesh_network_reset_network_pdus(&network_pdus_received); 1135 mesh_network_reset_network_pdus(&network_pdus_queued); 1136 mesh_network_reset_network_pdus(&network_pdus_outgoing_gatt); 1137 mesh_network_reset_network_pdus(&network_pdus_outgoing_adv); 1138 if (adv_bearer_network_pdu){ 1139 mesh_network_pdu_free(adv_bearer_network_pdu); 1140 adv_bearer_network_pdu = NULL; 1141 } 1142 if (gatt_bearer_network_pdu){ 1143 mesh_network_pdu_free(gatt_bearer_network_pdu); 1144 gatt_bearer_network_pdu = NULL; 1145 } 1146 if (outgoing_pdu){ 1147 mesh_network_pdu_free(outgoing_pdu); 1148 outgoing_pdu = NULL; 1149 } 1150 if (incoming_pdu_raw){ 1151 mesh_network_pdu_free(incoming_pdu_raw); 1152 incoming_pdu_raw = NULL; 1153 } 1154 if (incoming_pdu_decoded){ 1155 mesh_network_pdu_free(incoming_pdu_decoded); 1156 incoming_pdu_decoded = NULL; 1157 } 1158 mesh_crypto_active = 0; 1159 } 1160 1161 // buffer pool 1162 mesh_network_pdu_t * mesh_network_pdu_get(void){ 1163 mesh_network_pdu_t * network_pdu = btstack_memory_mesh_network_pdu_get(); 1164 if (network_pdu) { 1165 memset(network_pdu, 0, sizeof(mesh_network_pdu_t)); 1166 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_NETWORK; 1167 } 1168 return network_pdu; 1169 } 1170 1171 void mesh_network_pdu_free(mesh_network_pdu_t * network_pdu){ 1172 btstack_memory_mesh_network_pdu_free(network_pdu); 1173 } 1174 1175 // Mesh Subnet Management 1176 1177 void mesh_subnet_add(mesh_subnet_t * subnet){ 1178 btstack_linked_list_add_tail(&subnets, (btstack_linked_item_t *) subnet); 1179 } 1180 1181 void mesh_subnet_remove(mesh_subnet_t * subnet){ 1182 btstack_linked_list_remove(&subnets, (btstack_linked_item_t *) subnet); 1183 } 1184 1185 mesh_subnet_t * mesh_subnet_get_by_netkey_index(uint16_t netkey_index){ 1186 btstack_linked_list_iterator_t it; 1187 btstack_linked_list_iterator_init(&it, &subnets); 1188 while (btstack_linked_list_iterator_has_next(&it)){ 1189 mesh_subnet_t * item = (mesh_subnet_t *) btstack_linked_list_iterator_next(&it); 1190 if (item->netkey_index == netkey_index) return item; 1191 } 1192 return NULL; 1193 } 1194 1195 int mesh_subnet_list_count(void){ 1196 return btstack_linked_list_count(&subnets); 1197 } 1198 1199 // mesh network key iterator over all keys 1200 void mesh_subnet_iterator_init(mesh_subnet_iterator_t *it){ 1201 btstack_linked_list_iterator_init(&it->it, &subnets); 1202 } 1203 1204 int mesh_subnet_iterator_has_more(mesh_subnet_iterator_t *it){ 1205 return btstack_linked_list_iterator_has_next(&it->it); 1206 } 1207 1208 mesh_subnet_t * mesh_subnet_iterator_get_next(mesh_subnet_iterator_t *it){ 1209 return (mesh_subnet_t *) btstack_linked_list_iterator_next(&it->it); 1210 } 1211 1212 mesh_network_key_t * mesh_subnet_get_outgoing_network_key(mesh_subnet_t * subnet){ 1213 switch (subnet->key_refresh){ 1214 case MESH_KEY_REFRESH_SECOND_PHASE: 1215 return subnet->new_key; 1216 case MESH_KEY_REFRESH_NOT_ACTIVE: 1217 case MESH_KEY_REFRESH_FIRST_PHASE: 1218 default: 1219 return subnet->old_key; 1220 } 1221 } 1222 1223 /** 1224 * @brief Setup subnet for given netkey index 1225 */ 1226 void mesh_subnet_setup_for_netkey_index(uint16_t netkey_index){ 1227 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 1228 if (subnet != NULL) return; 1229 1230 // find old / new keys 1231 mesh_network_key_t * old_key = NULL; 1232 mesh_network_key_t * new_key = NULL; 1233 mesh_network_key_iterator_t it; 1234 mesh_network_key_iterator_init(&it); 1235 while (mesh_network_key_iterator_has_more(&it)){ 1236 mesh_network_key_t * network_key = mesh_network_key_iterator_get_next(&it); 1237 if (network_key->netkey_index != netkey_index) continue; 1238 if (old_key == NULL){ 1239 old_key = network_key; 1240 continue; 1241 } 1242 // assign current key depending on key version 1243 if (((int8_t) (network_key->version - new_key->version)) > 0) { 1244 new_key = network_key; 1245 } else { 1246 new_key = old_key; 1247 old_key = network_key; 1248 } 1249 } 1250 1251 // create subnet for netkey index 1252 subnet = btstack_memory_mesh_subnet_get(); 1253 if (subnet == NULL) return; 1254 subnet->netkey_index = netkey_index; 1255 mesh_subnet_add(subnet); 1256 1257 // set keys 1258 subnet->old_key = old_key; 1259 subnet->new_key = new_key; 1260 1261 // key refresh 1262 if (new_key == NULL){ 1263 // single key -> key refresh not active 1264 subnet->key_refresh = MESH_KEY_REFRESH_NOT_ACTIVE; 1265 } 1266 else { 1267 // two keys -> at least phase 1 1268 subnet->key_refresh = MESH_KEY_REFRESH_FIRST_PHASE; 1269 } 1270 } 1271