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 BLUEKITCHEN 24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "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 // register for freed network pdu 143 void (*mesh_network_free_pdu_callback)(void); 144 145 // prototypes 146 147 static void mesh_network_run(void); 148 static void process_network_pdu_validate(void); 149 150 // network caching 151 static uint32_t mesh_network_cache_hash(mesh_network_pdu_t * network_pdu){ 152 // - The SEQ field is a 24-bit integer that when combined with the IV Index, 153 // shall be a unique value for each new Network PDU originated by this node (=> SRC) 154 // - IV updates only rarely 155 // => 16 bit SRC, 1 bit IVI, 15 bit SEQ 156 uint8_t ivi = network_pdu->data[0] >> 7; 157 uint16_t seq = big_endian_read_16(network_pdu->data, 3); 158 uint16_t src = big_endian_read_16(network_pdu->data, 5); 159 return (src << 16) | (ivi << 15) | (seq & 0x7fff); 160 } 161 162 static int mesh_network_cache_find(uint32_t hash){ 163 int i; 164 for (i = 0; i < MESH_NETWORK_CACHE_SIZE; i++) { 165 if (mesh_network_cache[i] == hash) { 166 return 1; 167 } 168 } 169 return 0; 170 } 171 172 static void mesh_network_cache_add(uint32_t hash){ 173 mesh_network_cache[mesh_network_cache_index++] = hash; 174 if (mesh_network_cache_index >= MESH_NETWORK_CACHE_SIZE){ 175 mesh_network_cache_index = 0; 176 } 177 } 178 179 // common helper 180 int mesh_network_address_unicast(uint16_t addr){ 181 return addr != MESH_ADDRESS_UNSASSIGNED && (addr < 0x8000); 182 } 183 184 int mesh_network_address_virtual(uint16_t addr){ 185 return (addr & 0xC000) == 0x8000; // 0b10xx xxxx xxxx xxxx 186 } 187 188 int mesh_network_address_group(uint16_t addr){ 189 return (addr & 0xC000) == 0xC000; // 0b11xx xxxx xxxx xxxx 190 } 191 192 int mesh_network_address_all_proxies(uint16_t addr){ 193 return addr == MESH_ADDRESS_ALL_PROXIES; 194 } 195 196 int mesh_network_address_all_nodes(uint16_t addr){ 197 return addr == MESH_ADDRESS_ALL_NODES; 198 } 199 200 int mesh_network_address_all_friends(uint16_t addr){ 201 return addr == MESH_ADDRESS_ALL_FRIENDS; 202 } 203 204 int mesh_network_address_all_relays(uint16_t addr){ 205 return addr == MESH_ADDRESS_ALL_RELAYS; 206 } 207 208 int mesh_network_addresses_valid(uint8_t ctl, uint16_t src, uint16_t dst){ 209 // printf("CTL: %u\n", ctl); 210 // printf("SRC: %04x\n", src); 211 // printf("DST: %04x\n", dst); 212 if (src == 0){ 213 // printf("SRC Unassigned Addr -> ignore\n"); 214 return 0; 215 } 216 if ((src & 0xC000) == 0x8000){ 217 // printf("SRC Virtual Addr -> ignore\n"); 218 return 0; 219 } 220 if ((src & 0xC000) == 0xC000){ 221 // printf("SRC Group Addr -> ignore\n"); 222 return 0; 223 } 224 if (dst == 0){ 225 // printf("DST Unassigned Addr -> ignore\n"); 226 return 0; 227 } 228 if ( ((dst & 0xC000) == 0x8000) && (ctl == 1)){ 229 // printf("DST Virtual Addr in CONTROL -> ignore\n"); 230 return 0; 231 } 232 if ( (0xFF00 <= dst) && (dst <= 0xfffb) && (ctl == 0) ){ 233 // printf("DST RFU Group Addr in MESSAGE -> ignore\n"); 234 return 0; 235 } 236 // printf("SRC + DST Addr valid\n"); 237 return 1; 238 } 239 240 static void mesh_network_create_nonce(uint8_t * nonce, const mesh_network_pdu_t * pdu, uint32_t iv_index){ 241 unsigned int pos = 0; 242 nonce[pos++] = 0x0; // Network Nonce 243 (void)memcpy(&nonce[pos], &pdu->data[1], 6); 244 pos += 6; 245 big_endian_store_16(nonce, pos, 0); 246 pos += 2; 247 big_endian_store_32(nonce, pos, iv_index); 248 } 249 250 static void mesh_proxy_create_nonce(uint8_t * nonce, const mesh_network_pdu_t * pdu, uint32_t iv_index){ 251 unsigned int pos = 0; 252 nonce[pos++] = 0x3; // Proxy Nonce 253 nonce[pos++] = 0; 254 (void)memcpy(&nonce[pos], &pdu->data[2], 5); 255 pos += 5; 256 big_endian_store_16(nonce, pos, 0); 257 pos += 2; 258 big_endian_store_32(nonce, pos, iv_index); 259 } 260 261 // NID/IVI | obfuscated (CTL/TTL, SEQ (24), SRC (16) ), encrypted ( DST(16), TransportPDU), MIC(32 or 64) 262 263 static void mesh_network_send_complete(mesh_network_pdu_t * network_pdu){ 264 if (network_pdu->flags & MESH_NETWORK_PDU_FLAGS_RELAY){ 265 #ifdef LOG_NETWORK 266 printf("TX-F-NetworkPDU (%p): relay -> free packet\n", network_pdu); 267 #endif 268 mesh_network_pdu_free(network_pdu); 269 } else { 270 #ifdef LOG_NETWORK 271 printf("TX-F-NetworkPDU (%p): notify lower transport\n", network_pdu); 272 #endif 273 // notify higher layer 274 (*mesh_network_higher_layer_handler)(MESH_NETWORK_PDU_SENT, network_pdu); 275 } 276 } 277 278 // new 279 static void mesh_network_send_c(void *arg){ 280 UNUSED(arg); 281 282 // obfuscate 283 unsigned int i; 284 for (i=0;i<6;i++){ 285 outgoing_pdu->data[1+i] ^= obfuscation_block[i]; 286 } 287 288 #ifdef LOG_NETWORK 289 printf("TX-C-NetworkPDU (%p): ", outgoing_pdu); 290 printf_hexdump(outgoing_pdu->data, outgoing_pdu->len); 291 #endif 292 293 // crypto done 294 mesh_crypto_active = 0; 295 296 // done 297 mesh_network_pdu_t * network_pdu = outgoing_pdu; 298 outgoing_pdu = NULL; 299 300 if ((network_pdu->flags & MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION) != 0){ 301 // encryption requested by mesh_network_encrypt_proxy_configuration_message 302 (*mesh_network_proxy_message_handler)(MESH_NETWORK_PDU_ENCRYPTED, network_pdu); 303 return; 304 } 305 306 #ifdef LOG_NETWORK 307 printf("TX-D-NetworkPDU (%p): ", network_pdu); 308 printf_hexdump(network_pdu->data, network_pdu->len); 309 #endif 310 311 // add to queue 312 btstack_linked_list_add_tail(&network_pdus_outgoing_gatt, (btstack_linked_item_t *) network_pdu); 313 314 // go 315 mesh_network_run(); 316 } 317 318 static void mesh_network_send_b(void *arg){ 319 UNUSED(arg); 320 321 uint32_t iv_index = mesh_get_iv_index_for_tx(); 322 323 // store NetMIC 324 uint8_t net_mic[8]; 325 btstack_crypto_ccm_get_authentication_value(&mesh_network_crypto_request.ccm, net_mic); 326 327 // store MIC 328 uint8_t net_mic_len = outgoing_pdu->data[1] & 0x80 ? 8 : 4; 329 (void)memcpy(&outgoing_pdu->data[outgoing_pdu->len], net_mic, net_mic_len); 330 outgoing_pdu->len += net_mic_len; 331 332 btstack_assert(outgoing_pdu->len <= 29); 333 334 #ifdef LOG_NETWORK 335 printf("TX-B-NetworkPDU (%p): ", outgoing_pdu); 336 printf_hexdump(outgoing_pdu->data, outgoing_pdu->len); 337 #endif 338 339 // calc PECB 340 memset(encryption_block, 0, 5); 341 big_endian_store_32(encryption_block, 5, iv_index); 342 (void)memcpy(&encryption_block[9], &outgoing_pdu->data[7], 7); 343 btstack_crypto_aes128_encrypt(&mesh_network_crypto_request.aes128, current_network_key->privacy_key, encryption_block, obfuscation_block, &mesh_network_send_c, NULL); 344 } 345 346 static void mesh_network_send_a(void){ 347 348 mesh_crypto_active = 1; 349 350 uint32_t iv_index = mesh_get_iv_index_for_tx(); 351 352 // lookup subnet by netkey_index 353 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(outgoing_pdu->netkey_index); 354 if (!subnet) { 355 mesh_crypto_active = 0; 356 mesh_network_pdu_t * network_pdu = outgoing_pdu; 357 outgoing_pdu = NULL; 358 // notify upper layer 359 mesh_network_send_complete(network_pdu); 360 // run again 361 mesh_network_run(); 362 return; 363 } 364 365 // get network key to use for sending 366 current_network_key = mesh_subnet_get_outgoing_network_key(subnet); 367 368 #ifdef LOG_NETWORK 369 printf("TX-A-NetworkPDU (%p): ", outgoing_pdu); 370 printf_hexdump(outgoing_pdu->data, outgoing_pdu->len); 371 #endif 372 373 // get network nonce 374 if (outgoing_pdu->flags & MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION){ 375 mesh_proxy_create_nonce(network_nonce, outgoing_pdu, iv_index); 376 #ifdef LOG_NETWORK 377 printf("TX-ProxyNonce: "); 378 printf_hexdump(network_nonce, 13); 379 #endif 380 } else { 381 mesh_network_create_nonce(network_nonce, outgoing_pdu, iv_index); 382 #ifdef LOG_NETWORK 383 printf("TX-NetworkNonce: "); 384 printf_hexdump(network_nonce, 13); 385 #endif 386 } 387 388 #ifdef LOG_NETWORK 389 printf("TX-EncryptionKey: "); 390 printf_hexdump(current_network_key->encryption_key, 16); 391 #endif 392 393 // start ccm 394 uint8_t cypher_len = outgoing_pdu->len - 7; 395 uint8_t net_mic_len = outgoing_pdu->data[1] & 0x80 ? 8 : 4; 396 btstack_crypto_ccm_init(&mesh_network_crypto_request.ccm, current_network_key->encryption_key, network_nonce, cypher_len, 0, net_mic_len); 397 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); 398 } 399 400 #if defined(ENABLE_MESH_RELAY) || defined (ENABLE_MESH_PROXY_SERVER) 401 static void mesh_network_relay_message(mesh_network_pdu_t * network_pdu){ 402 403 uint8_t ctl_ttl = network_pdu->data[1]; 404 uint8_t ctl_in_bit_7 = ctl_ttl & 0x80; 405 uint8_t ttl = ctl_ttl & 0x7f; 406 407 // prepare pdu for resending 408 network_pdu->data[1] = ctl_in_bit_7 | (ttl - 1); 409 network_pdu->flags |= MESH_NETWORK_PDU_FLAGS_RELAY; 410 411 #ifdef LOG_NETWORK 412 printf("TX-Relay-NetworkPDU (%p): ", network_pdu); 413 printf_hexdump(network_pdu->data, network_pdu->len); 414 printf("^^ into network_pdus_queued\n"); 415 #endif 416 417 uint8_t net_mic_len = ctl_in_bit_7 ? 8 : 4; 418 btstack_assert((network_pdu->len + net_mic_len) <= 29); 419 UNUSED(net_mic_len); 420 421 // queue up 422 btstack_linked_list_add_tail(&network_pdus_queued, (btstack_linked_item_t *) network_pdu); 423 } 424 #endif 425 426 void mesh_network_message_processed_by_higher_layer(mesh_network_pdu_t * network_pdu){ 427 428 #if defined(ENABLE_MESH_RELAY) || defined (ENABLE_MESH_PROXY_SERVER) 429 430 // check if address does not matches elements on our node and TTL >= 2 431 uint16_t src = mesh_network_src(network_pdu); 432 uint8_t ttl = mesh_network_ttl(network_pdu); 433 434 uint16_t mesh_network_primary_address = mesh_node_get_primary_element_address(); 435 436 if (((src < mesh_network_primary_address) || (src > (mesh_network_primary_address + mesh_node_element_count()))) && (ttl >= 2)){ 437 438 if ((network_pdu->flags & MESH_NETWORK_PDU_FLAGS_GATT_BEARER) == 0){ 439 440 // message received via ADV bearer are relayed: 441 442 #ifdef ENABLE_MESH_RELAY 443 if (mesh_foundation_relay_get() != 0){ 444 // - to ADV bearer, if Relay supported and enabledx 445 mesh_network_relay_message(network_pdu); 446 mesh_network_run(); 447 return; 448 } 449 #endif 450 451 #ifdef ENABLE_MESH_PROXY_SERVER 452 if (mesh_foundation_gatt_proxy_get() != 0){ 453 // - to GATT bearer, if Proxy supported and enabled 454 mesh_network_relay_message(network_pdu); 455 mesh_network_run(); 456 return; 457 } 458 #endif 459 460 } else { 461 462 // messages received via GATT bearer are relayed: 463 464 #ifdef ENABLE_MESH_PROXY_SERVER 465 if (mesh_foundation_gatt_proxy_get() != 0){ 466 // - to ADV bearer, if Proxy supported and enabled 467 mesh_network_relay_message(network_pdu); 468 mesh_network_run(); 469 return; 470 } 471 #endif 472 473 } 474 } 475 #endif 476 477 // otherwise, we're done 478 btstack_memory_mesh_network_pdu_free(network_pdu); 479 } 480 481 static void process_network_pdu_done(void){ 482 btstack_memory_mesh_network_pdu_free(incoming_pdu_raw); 483 incoming_pdu_raw = NULL; 484 mesh_crypto_active = 0; 485 486 mesh_network_run(); 487 } 488 489 static void process_network_pdu_validate_d(void * arg){ 490 UNUSED(arg); 491 // mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) arg; 492 493 uint8_t ctl_ttl = incoming_pdu_decoded->data[1]; 494 uint8_t ctl = ctl_ttl >> 7; 495 uint8_t net_mic_len = (ctl_ttl & 0x80) ? 8 : 4; 496 497 // store NetMIC 498 uint8_t net_mic[8]; 499 btstack_crypto_ccm_get_authentication_value(&mesh_network_crypto_request.ccm, net_mic); 500 #ifdef LOG_NETWORK 501 printf("RX-NetMIC (%p): ", incoming_pdu_decoded); 502 printf_hexdump(net_mic, net_mic_len); 503 #endif 504 // store in decoded pdu 505 (void)memcpy(&incoming_pdu_decoded->data[incoming_pdu_decoded->len - net_mic_len], 506 net_mic, net_mic_len); 507 508 #ifdef LOG_NETWORK 509 uint8_t cypher_len = incoming_pdu_decoded->len - 9 - net_mic_len; 510 printf("RX-Decrypted DST/TransportPDU (%p): ", incoming_pdu_decoded); 511 printf_hexdump(&incoming_pdu_decoded->data[7], 2 + cypher_len); 512 513 printf("RX-Decrypted: "); 514 printf_hexdump(incoming_pdu_decoded->data, incoming_pdu_decoded->len); 515 #endif 516 517 // validate network mic 518 if (memcmp(net_mic, &incoming_pdu_raw->data[incoming_pdu_decoded->len-net_mic_len], net_mic_len) != 0){ 519 // fail 520 printf("RX-NetMIC mismatch, try next key (%p)\n", incoming_pdu_decoded); 521 process_network_pdu_validate(); 522 return; 523 } 524 525 // remove NetMIC from payload 526 incoming_pdu_decoded->len -= net_mic_len; 527 528 #ifdef LOG_NETWORK 529 // match 530 printf("RX-NetMIC matches (%p)\n", incoming_pdu_decoded); 531 printf("RX-TTL (%p): 0x%02x\n", incoming_pdu_decoded, incoming_pdu_decoded->data[1] & 0x7f); 532 #endif 533 534 // set netkey_index 535 incoming_pdu_decoded->netkey_index = current_network_key->netkey_index; 536 537 if (incoming_pdu_decoded->flags & MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION){ 538 539 mesh_network_pdu_t * decoded_pdu = incoming_pdu_decoded; 540 incoming_pdu_decoded = NULL; 541 542 // no additional checks for proxy messages 543 (*mesh_network_proxy_message_handler)(MESH_NETWORK_PDU_RECEIVED, decoded_pdu); 544 545 } else { 546 547 // validate src/dest addresses 548 uint16_t src = big_endian_read_16(incoming_pdu_decoded->data, 5); 549 uint16_t dst = big_endian_read_16(incoming_pdu_decoded->data, 7); 550 int valid = mesh_network_addresses_valid(ctl, src, dst); 551 if (!valid){ 552 #ifdef LOG_NETWORK 553 printf("RX Address invalid (%p)\n", incoming_pdu_decoded); 554 #endif 555 btstack_memory_mesh_network_pdu_free(incoming_pdu_decoded); 556 incoming_pdu_decoded = NULL; 557 process_network_pdu_done(); 558 return; 559 } 560 561 // check cache 562 uint32_t hash = mesh_network_cache_hash(incoming_pdu_decoded); 563 #ifdef LOG_NETWORK 564 printf("RX-Hash (%p): %08x\n", incoming_pdu_decoded, hash); 565 #endif 566 if (mesh_network_cache_find(hash)){ 567 // found in cache, drop 568 #ifdef LOG_NETWORK 569 printf("Found in cache -> drop packet (%p)\n", incoming_pdu_decoded); 570 #endif 571 btstack_memory_mesh_network_pdu_free(incoming_pdu_decoded); 572 incoming_pdu_decoded = NULL; 573 process_network_pdu_done(); 574 return; 575 } 576 577 // store in network cache 578 mesh_network_cache_add(hash); 579 580 #ifdef LOG_NETWORK 581 printf("RX-Validated (%p) - forward to lower transport\n", incoming_pdu_decoded); 582 #endif 583 584 // forward to lower transport layer. message is freed by call to mesh_network_message_processed_by_upper_layer 585 mesh_network_pdu_t * decoded_pdu = incoming_pdu_decoded; 586 incoming_pdu_decoded = NULL; 587 (*mesh_network_higher_layer_handler)(MESH_NETWORK_PDU_RECEIVED, decoded_pdu); 588 } 589 590 // done 591 process_network_pdu_done(); 592 } 593 594 static uint32_t iv_index_for_pdu(const mesh_network_pdu_t * network_pdu){ 595 // get IV Index and IVI 596 uint32_t iv_index = mesh_get_iv_index(); 597 int ivi = network_pdu->data[0] >> 7; 598 599 // if least significant bit differs, use previous IV Index 600 if ((iv_index & 1 ) ^ ivi){ 601 iv_index--; 602 #ifdef LOG_NETWORK 603 printf("RX-IV: IVI indicates previous IV index, using 0x%08x\n", iv_index); 604 #endif 605 } 606 return iv_index; 607 } 608 609 static void process_network_pdu_validate_b(void * arg){ 610 UNUSED(arg); 611 612 #ifdef LOG_NETWORK 613 printf("RX-PECB: "); 614 printf_hexdump(obfuscation_block, 6); 615 #endif 616 617 // de-obfuscate 618 unsigned int i; 619 for (i=0;i<6;i++){ 620 incoming_pdu_decoded->data[1+i] = incoming_pdu_raw->data[1+i] ^ obfuscation_block[i]; 621 } 622 623 uint32_t iv_index = iv_index_for_pdu(incoming_pdu_raw); 624 625 if (incoming_pdu_decoded->flags & MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION){ 626 // create network nonce 627 mesh_proxy_create_nonce(network_nonce, incoming_pdu_decoded, iv_index); 628 #ifdef LOG_NETWORK 629 printf("RX-Proxy Nonce: "); 630 printf_hexdump(network_nonce, 13); 631 #endif 632 } else { 633 // create network nonce 634 mesh_network_create_nonce(network_nonce, incoming_pdu_decoded, iv_index); 635 #ifdef LOG_NETWORK 636 printf("RX-Network Nonce: "); 637 printf_hexdump(network_nonce, 13); 638 #endif 639 } 640 641 // 642 uint8_t ctl_ttl = incoming_pdu_decoded->data[1]; 643 uint8_t net_mic_len = (ctl_ttl & 0x80) ? 8 : 4; 644 uint8_t cypher_len = incoming_pdu_decoded->len - 7 - net_mic_len; 645 646 #ifdef LOG_NETWORK 647 printf("RX-Cyper len %u, mic len %u\n", cypher_len, net_mic_len); 648 649 printf("RX-Encryption Key: "); 650 printf_hexdump(current_network_key->encryption_key, 16); 651 652 #endif 653 654 btstack_crypto_ccm_init(&mesh_network_crypto_request.ccm, current_network_key->encryption_key, network_nonce, cypher_len, 0, net_mic_len); 655 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); 656 } 657 658 static void process_network_pdu_validate(void){ 659 if (!mesh_network_key_nid_iterator_has_more(&validation_network_key_it)){ 660 printf("No valid network key found\n"); 661 btstack_memory_mesh_network_pdu_free(incoming_pdu_decoded); 662 incoming_pdu_decoded = NULL; 663 process_network_pdu_done(); 664 return; 665 } 666 667 current_network_key = mesh_network_key_nid_iterator_get_next(&validation_network_key_it); 668 669 // calc PECB 670 uint32_t iv_index = iv_index_for_pdu(incoming_pdu_raw); 671 memset(encryption_block, 0, 5); 672 big_endian_store_32(encryption_block, 5, iv_index); 673 (void)memcpy(&encryption_block[9], &incoming_pdu_raw->data[7], 7); 674 btstack_crypto_aes128_encrypt(&mesh_network_crypto_request.aes128, current_network_key->privacy_key, encryption_block, obfuscation_block, &process_network_pdu_validate_b, NULL); 675 } 676 677 678 static void process_network_pdu(void){ 679 // 680 uint8_t nid_ivi = incoming_pdu_raw->data[0]; 681 682 // setup pdu object 683 incoming_pdu_decoded->data[0] = nid_ivi; 684 incoming_pdu_decoded->len = incoming_pdu_raw->len; 685 incoming_pdu_decoded->flags = incoming_pdu_raw->flags; 686 687 // init provisioning data iterator 688 uint8_t nid = nid_ivi & 0x7f; 689 // uint8_t iv_index = network_pdu_data[0] >> 7; 690 mesh_network_key_nid_iterator_init(&validation_network_key_it, nid); 691 692 process_network_pdu_validate(); 693 } 694 695 // returns true if done 696 static bool mesh_network_run_gatt(void){ 697 if (btstack_linked_list_empty(&network_pdus_outgoing_gatt)){ 698 return true; 699 } 700 701 #ifdef ENABLE_MESH_GATT_BEARER 702 if (gatt_bearer_network_pdu != NULL){ 703 return true; 704 } 705 706 // move to 'gatt bearer queue' 707 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_outgoing_gatt); 708 709 #ifdef LOG_NETWORK 710 printf("network run 1: pop %p from network_pdus_outgoing_gatt\n", network_pdu); 711 #endif 712 // request to send via gatt if: 713 // proxy active and connected 714 // packet wasn't received via gatt bearer 715 int send_via_gatt = ((mesh_foundation_gatt_proxy_get() != 0) && 716 (gatt_bearer_con_handle != HCI_CON_HANDLE_INVALID) && 717 ((network_pdu->flags & MESH_NETWORK_PDU_FLAGS_GATT_BEARER) == 0)); 718 if (send_via_gatt){ 719 720 #ifdef LOG_NETWORK 721 printf("network run 2: set %p as gatt_bearer_network_pdu\n", network_pdu); 722 #endif 723 gatt_bearer_network_pdu = network_pdu; 724 gatt_bearer_request_can_send_now_for_network_pdu(); 725 726 } else { 727 728 #ifdef LOG_NETWORK 729 printf("network run 3: push %p to network_pdus_outgoing_adv\n", network_pdu); 730 #endif 731 btstack_linked_list_add_tail(&network_pdus_outgoing_adv, (btstack_linked_item_t *) network_pdu); 732 733 #ifdef LOG_NETWORK 734 mesh_network_dump_network_pdus("network_pdus_outgoing_adv (1)", &network_pdus_outgoing_adv); 735 #endif 736 } 737 #else 738 // directly move to 'outgoing adv bearer queue' 739 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_outgoing_gatt); 740 btstack_linked_list_add_tail(&network_pdus_outgoing_adv, (btstack_linked_item_t *) network_pdu); 741 #endif 742 return false; 743 } 744 745 // returns true if done 746 static bool mesh_network_run_adv(void){ 747 748 if (btstack_linked_list_empty(&network_pdus_outgoing_adv)){ 749 return true; 750 } 751 752 #ifdef ENABLE_MESH_ADV_BEARER 753 if (adv_bearer_network_pdu != NULL){ 754 return true; 755 } 756 757 // move to 'adv bearer queue' 758 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_outgoing_adv); 759 760 #ifdef LOG_NETWORK 761 printf("network run 4: pop %p from network_pdus_outgoing_adv\n", network_pdu); 762 mesh_network_dump_network_pdus("network_pdus_outgoing_adv (3)", &network_pdus_outgoing_adv); 763 printf("network run 5: %p -> flags 0x%02x, gatt_proxy %u, relay %u\n", network_pdu, network_pdu->flags, mesh_foundation_gatt_proxy_get(), mesh_foundation_relay_get()); 764 #endif 765 766 // send via adv if: 767 // packet was received via gatt bearer and proxy active, or, 768 // packet originated locally (== not relayed), or, 769 // packet was received via ADV bearer and relay is active, or, 770 int send_via_adv = (((network_pdu->flags & MESH_NETWORK_PDU_FLAGS_GATT_BEARER) != 0) && (mesh_foundation_gatt_proxy_get() == 1)) || 771 (((network_pdu->flags & MESH_NETWORK_PDU_FLAGS_GATT_BEARER) == 0) && (mesh_foundation_relay_get() == 1)) || 772 ((network_pdu->flags & MESH_NETWORK_PDU_FLAGS_RELAY) == 0); 773 774 if (send_via_adv){ 775 #ifdef LOG_NETWORK 776 printf("network run 6: set %p as to adv_bearer_network_pdu\n", network_pdu); 777 #endif 778 adv_bearer_network_pdu = network_pdu; 779 adv_bearer_request_can_send_now_for_network_pdu(); 780 } else { 781 #ifdef LOG_NETWORK 782 printf("network run 7: skip sending %p via adv bearer\n", network_pdu); 783 #endif 784 // directly notify upper layer 785 mesh_network_send_complete(network_pdu); 786 } 787 #else 788 // done 789 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_outgoing_adv); 790 // directly notify upper layer 791 mesh_network_send_complete(network_pdu); 792 #endif 793 return false; 794 } 795 796 // returns true if done 797 static bool mesh_network_run_received(void){ 798 if (mesh_crypto_active) { 799 return true; 800 } 801 802 if (btstack_linked_list_empty(&network_pdus_received)) { 803 return true; 804 } 805 806 incoming_pdu_decoded = mesh_network_pdu_get(); 807 if (incoming_pdu_decoded == NULL) return true; 808 809 // get encoded network pdu and start processing 810 mesh_crypto_active = 1; 811 incoming_pdu_raw = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_received); 812 process_network_pdu(); 813 return true; 814 } 815 816 // returns true if done 817 static bool mesh_network_run_queued(void){ 818 if (mesh_crypto_active) { 819 return true; 820 } 821 822 if (btstack_linked_list_empty(&network_pdus_queued)){ 823 return true; 824 } 825 826 // get queued network pdu and start processing 827 outgoing_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_queued); 828 829 #ifdef LOG_NETWORK 830 printf("network run 5: pop %p from network_pdus_queued\n", outgoing_pdu); 831 mesh_network_dump_network_pdus("network_pdus_queued (2)", &network_pdus_queued); 832 #endif 833 mesh_network_send_a(); 834 return true; 835 } 836 837 static void mesh_network_run(void){ 838 while (true){ 839 bool done = true; 840 done &= mesh_network_run_gatt(); 841 done &= mesh_network_run_adv(); 842 done &= mesh_network_run_received(); 843 done &= mesh_network_run_queued(); 844 if (done) break; 845 } 846 } 847 848 #ifdef ENABLE_MESH_ADV_BEARER 849 static void mesh_adv_bearer_handle_network_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 850 UNUSED(channel); 851 mesh_network_pdu_t * network_pdu; 852 uint8_t transmission_count; 853 uint16_t transmission_interval; 854 uint8_t transmit_config; 855 856 switch (packet_type){ 857 case MESH_NETWORK_PACKET: 858 // check len. minimal transport PDU len = 1, 32 bit NetMIC -> 13 bytes 859 if (size < 13) break; 860 861 #ifdef LOG_NETWORK 862 printf("received network pdu from adv (len %u): ", size); 863 printf_hexdump(packet, size); 864 #endif 865 mesh_network_received_message(packet, size, 0); 866 break; 867 868 case HCI_EVENT_PACKET: 869 if (hci_event_packet_get_type(packet) != HCI_EVENT_MESH_META) break; 870 871 switch(hci_event_mesh_meta_get_subevent_code(packet)){ 872 case MESH_SUBEVENT_CAN_SEND_NOW: 873 if (adv_bearer_network_pdu == NULL) break; 874 875 // Get Transmission config depending on relay flag 876 if (adv_bearer_network_pdu->flags & MESH_NETWORK_PDU_FLAGS_RELAY){ 877 transmit_config = mesh_foundation_relay_get(); 878 } else { 879 transmit_config = mesh_foundation_network_transmit_get(); 880 } 881 transmission_count = (transmit_config & 0x07) + 1; 882 transmission_interval = (transmit_config >> 3) * 10; 883 884 #ifdef LOG_NETWORK 885 printf("TX-E-NetworkPDU (%p) count %u, interval %u ms: ", adv_bearer_network_pdu, transmission_count, transmission_interval); 886 printf_hexdump(adv_bearer_network_pdu->data, adv_bearer_network_pdu->len); 887 #endif 888 889 adv_bearer_send_network_pdu(adv_bearer_network_pdu->data, adv_bearer_network_pdu->len, transmission_count, transmission_interval); 890 network_pdu = adv_bearer_network_pdu; 891 adv_bearer_network_pdu = NULL; 892 893 // notify upper layer 894 mesh_network_send_complete(network_pdu); 895 896 // check if more to send 897 mesh_network_run(); 898 break; 899 default: 900 break; 901 } 902 break; 903 default: 904 break; 905 } 906 } 907 #endif 908 909 #ifdef ENABLE_MESH_GATT_BEARER 910 static void mesh_network_gatt_bearer_outgoing_complete(void){ 911 912 if (gatt_bearer_network_pdu == NULL) return; 913 914 // forward to adv bearer 915 btstack_linked_list_add_tail(&network_pdus_outgoing_adv, (btstack_linked_item_t*) gatt_bearer_network_pdu); 916 gatt_bearer_network_pdu = NULL; 917 918 mesh_network_run(); 919 return; 920 } 921 922 static void mesh_network_gatt_bearer_handle_network_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 923 UNUSED(channel); 924 switch (packet_type){ 925 case MESH_PROXY_DATA_PACKET: 926 if (mesh_foundation_gatt_proxy_get() == 0) break; 927 #ifdef LOG_NETWORK 928 printf("received network pdu from gatt (len %u): ", size); 929 printf_hexdump(packet, size); 930 #endif 931 mesh_network_received_message(packet, size, MESH_NETWORK_PDU_FLAGS_GATT_BEARER); 932 break; 933 case HCI_EVENT_PACKET: 934 switch (hci_event_packet_get_type(packet)){ 935 case HCI_EVENT_MESH_META: 936 switch (hci_event_mesh_meta_get_subevent_code(packet)){ 937 case MESH_SUBEVENT_PROXY_CONNECTED: 938 gatt_bearer_con_handle = mesh_subevent_proxy_connected_get_con_handle(packet); 939 break; 940 case MESH_SUBEVENT_PROXY_DISCONNECTED: 941 gatt_bearer_con_handle = HCI_CON_HANDLE_INVALID; 942 mesh_network_gatt_bearer_outgoing_complete(); 943 break; 944 case MESH_SUBEVENT_CAN_SEND_NOW: 945 if (gatt_bearer_network_pdu == NULL) break; 946 #ifdef LOG_NETWORK 947 printf("G-TX-E-NetworkPDU (%p): ", gatt_bearer_network_pdu); 948 printf_hexdump(gatt_bearer_network_pdu->data, gatt_bearer_network_pdu->len); 949 #endif 950 gatt_bearer_send_network_pdu(gatt_bearer_network_pdu->data, gatt_bearer_network_pdu->len); 951 break; 952 953 case MESH_SUBEVENT_MESSAGE_SENT: 954 mesh_network_gatt_bearer_outgoing_complete(); 955 break; 956 default: 957 break; 958 } 959 break; 960 default: 961 break; 962 } 963 break; 964 default: 965 break; 966 } 967 } 968 #endif 969 970 #ifdef ENABLE_MESH_GATT_BEARER 971 static void mesh_netework_gatt_bearer_handle_proxy_configuration(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 972 UNUSED(channel); 973 switch (packet_type){ 974 case MESH_PROXY_DATA_PACKET: 975 mesh_network_process_proxy_configuration_message(packet, size); 976 break; 977 case HCI_EVENT_PACKET: 978 switch (hci_event_packet_get_type(packet)){ 979 case HCI_EVENT_MESH_META: 980 switch (hci_event_mesh_meta_get_subevent_code(packet)){ 981 case MESH_SUBEVENT_CAN_SEND_NOW: 982 // forward to higher layer 983 (*mesh_network_proxy_message_handler)(MESH_NETWORK_CAN_SEND_NOW, NULL); 984 break; 985 default: 986 break; 987 } 988 break; 989 default: 990 break; 991 } 992 break; 993 default: 994 break; 995 } 996 } 997 #endif 998 999 void mesh_network_init(void){ 1000 #ifdef ENABLE_MESH_ADV_BEARER 1001 adv_bearer_register_for_network_pdu(&mesh_adv_bearer_handle_network_event); 1002 #endif 1003 #ifdef ENABLE_MESH_GATT_BEARER 1004 gatt_bearer_con_handle = HCI_CON_HANDLE_INVALID; 1005 gatt_bearer_register_for_network_pdu(&mesh_network_gatt_bearer_handle_network_event); 1006 gatt_bearer_register_for_mesh_proxy_configuration(&mesh_netework_gatt_bearer_handle_proxy_configuration); 1007 #endif 1008 } 1009 1010 void mesh_network_set_higher_layer_handler(void (*packet_handler)(mesh_network_callback_type_t callback_type, mesh_network_pdu_t * network_pdu)){ 1011 mesh_network_higher_layer_handler = packet_handler; 1012 } 1013 1014 void mesh_network_set_proxy_message_handler(void (*packet_handler)(mesh_network_callback_type_t callback_type, mesh_network_pdu_t * network_pdu)){ 1015 mesh_network_proxy_message_handler = packet_handler; 1016 } 1017 1018 void mesh_network_received_message(const uint8_t * pdu_data, uint8_t pdu_len, uint8_t flags){ 1019 // verify len 1020 if (pdu_len > 29) return; 1021 1022 // allocate network_pdu 1023 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 1024 if (!network_pdu) return; 1025 1026 // store data 1027 (void)memcpy(network_pdu->data, pdu_data, pdu_len); 1028 network_pdu->len = pdu_len; 1029 network_pdu->flags = flags; 1030 1031 // add to list and go 1032 btstack_linked_list_add_tail(&network_pdus_received, (btstack_linked_item_t *) network_pdu); 1033 mesh_network_run(); 1034 1035 } 1036 1037 void mesh_network_process_proxy_configuration_message(const uint8_t * pdu_data, uint8_t pdu_len){ 1038 // verify len 1039 if (pdu_len > 29) return; 1040 1041 // allocate network_pdu 1042 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 1043 if (!network_pdu) return; 1044 1045 // store data 1046 (void)memcpy(network_pdu->data, pdu_data, pdu_len); 1047 network_pdu->len = pdu_len; 1048 network_pdu->flags = MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION; // Network PDU 1049 1050 // add to list and go 1051 btstack_linked_list_add_tail(&network_pdus_received, (btstack_linked_item_t *) network_pdu); 1052 mesh_network_run(); 1053 } 1054 1055 void mesh_network_send_pdu(mesh_network_pdu_t * network_pdu){ 1056 #ifdef LOG_NETWORK 1057 printf("TX-NetworkPDU (%p): ", network_pdu); 1058 printf_hexdump(network_pdu->data, network_pdu->len); 1059 printf("^^ into network_pdus_queued\n"); 1060 #endif 1061 1062 btstack_assert((network_pdu->len + (network_pdu->data[1] & 0x80 ? 8 : 4)) <= 29); 1063 btstack_assert(network_pdu->len >= 9); 1064 1065 // setup callback 1066 network_pdu->flags = 0; 1067 1068 // queue up 1069 btstack_linked_list_add_tail(&network_pdus_queued, (btstack_linked_item_t *) network_pdu); 1070 #ifdef LOG_NETWORK 1071 mesh_network_dump_network_pdus("network_pdus_queued", &network_pdus_queued); 1072 #endif 1073 1074 // go 1075 mesh_network_run(); 1076 } 1077 1078 void mesh_network_encrypt_proxy_configuration_message(mesh_network_pdu_t * network_pdu){ 1079 printf("ProxyPDU(unencrypted): "); 1080 printf_hexdump(network_pdu->data, network_pdu->len); 1081 1082 // setup callback 1083 network_pdu->flags = MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION; 1084 1085 // queue up 1086 btstack_linked_list_add_tail(&network_pdus_queued, (btstack_linked_item_t *) network_pdu); 1087 1088 // go 1089 mesh_network_run(); 1090 } 1091 1092 /* 1093 * @brief Setup network pdu header 1094 * @param netkey_index 1095 * @param ctl 1096 * @param ttl 1097 * @param seq 1098 * @param dest 1099 */ 1100 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){ 1101 // set netkey_index 1102 network_pdu->netkey_index = netkey_index; 1103 // setup header 1104 network_pdu->len = 0; 1105 network_pdu->data[network_pdu->len++] = (mesh_get_iv_index_for_tx() << 7) | nid; 1106 uint8_t ctl_ttl = (ctl << 7) | (ttl & 0x7f); 1107 network_pdu->data[network_pdu->len++] = ctl_ttl; 1108 big_endian_store_24(network_pdu->data, 2, seq); 1109 network_pdu->len += 3; 1110 big_endian_store_16(network_pdu->data, network_pdu->len, src); 1111 network_pdu->len += 2; 1112 big_endian_store_16(network_pdu->data, network_pdu->len, dest); 1113 network_pdu->len += 2; 1114 btstack_assert((network_pdu->len + transport_pdu_len) <= MESH_NETWORK_PAYLOAD_MAX); 1115 (void)memcpy(&network_pdu->data[network_pdu->len], transport_pdu_data, 1116 transport_pdu_len); 1117 network_pdu->len += transport_pdu_len; 1118 // zero rest of packet 1119 memset(&network_pdu->data[network_pdu->len], 0, MESH_NETWORK_PAYLOAD_MAX - network_pdu->len); 1120 } 1121 1122 /* 1123 * @brief Setup network pdu header 1124 * @param netkey_index 1125 * @param ctl 1126 * @param ttl 1127 * @param seq 1128 * @param dest 1129 */ 1130 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){ 1131 // set netkey_index 1132 network_pdu->netkey_index = netkey_index; 1133 // setup header 1134 network_pdu->data[0] = (mesh_get_iv_index_for_tx() << 7) | nid; 1135 uint8_t ctl_ttl = (ctl << 7) | (ttl & 0x7f); 1136 network_pdu->data[1] = ctl_ttl; 1137 big_endian_store_24(network_pdu->data, 2, seq); 1138 big_endian_store_16(network_pdu->data, 5, src); 1139 big_endian_store_16(network_pdu->data, 7, dest); 1140 } 1141 1142 // Network PDU Getter 1143 uint8_t mesh_network_nid(mesh_network_pdu_t * network_pdu){ 1144 return network_pdu->data[0] & 0x7f; 1145 } 1146 uint16_t mesh_network_control(mesh_network_pdu_t * network_pdu){ 1147 return network_pdu->data[1] & 0x80; 1148 } 1149 uint8_t mesh_network_ttl(mesh_network_pdu_t * network_pdu){ 1150 return network_pdu->data[1] & 0x7f; 1151 } 1152 uint32_t mesh_network_seq(mesh_network_pdu_t * network_pdu){ 1153 return big_endian_read_24(network_pdu->data, 2); 1154 } 1155 uint16_t mesh_network_src(mesh_network_pdu_t * network_pdu){ 1156 return big_endian_read_16(network_pdu->data, 5); 1157 } 1158 uint16_t mesh_network_dst(mesh_network_pdu_t * network_pdu){ 1159 return big_endian_read_16(network_pdu->data, 7); 1160 } 1161 int mesh_network_segmented(mesh_network_pdu_t * network_pdu){ 1162 return network_pdu->data[9] & 0x80; 1163 } 1164 uint8_t mesh_network_control_opcode(mesh_network_pdu_t * network_pdu){ 1165 return network_pdu->data[9] & 0x7f; 1166 } 1167 uint8_t * mesh_network_pdu_data(mesh_network_pdu_t * network_pdu){ 1168 return &network_pdu->data[9]; 1169 } 1170 uint8_t mesh_network_pdu_len(mesh_network_pdu_t * network_pdu){ 1171 return network_pdu->len - 9; 1172 } 1173 1174 void mesh_network_pdu_set_seq(mesh_network_pdu_t * network_pdu, uint32_t seq){ 1175 big_endian_store_24(network_pdu->data, 2, seq); 1176 } 1177 1178 static void mesh_network_dump_network_pdu(mesh_network_pdu_t * network_pdu){ 1179 if (network_pdu){ 1180 printf("- %p: ", network_pdu); printf_hexdump(network_pdu->data, network_pdu->len); 1181 } 1182 } 1183 static void mesh_network_dump_network_pdus(const char * name, btstack_linked_list_t * list){ 1184 printf("List: %s:\n", name); 1185 btstack_linked_list_iterator_t it; 1186 btstack_linked_list_iterator_init(&it, list); 1187 while (btstack_linked_list_iterator_has_next(&it)){ 1188 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t*) btstack_linked_list_iterator_next(&it); 1189 mesh_network_dump_network_pdu(network_pdu); 1190 } 1191 } 1192 static void mesh_network_reset_network_pdus(btstack_linked_list_t * list){ 1193 while (!btstack_linked_list_empty(list)){ 1194 mesh_network_pdu_t * pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(list); 1195 btstack_memory_mesh_network_pdu_free(pdu); 1196 } 1197 } 1198 void mesh_network_dump(void){ 1199 mesh_network_dump_network_pdus("network_pdus_received", &network_pdus_received); 1200 mesh_network_dump_network_pdus("network_pdus_queued", &network_pdus_queued); 1201 mesh_network_dump_network_pdus("network_pdus_outgoing_gatt", &network_pdus_outgoing_gatt); 1202 mesh_network_dump_network_pdus("network_pdus_outgoing_adv", &network_pdus_outgoing_adv); 1203 printf("outgoing_pdu: \n"); 1204 mesh_network_dump_network_pdu(outgoing_pdu); 1205 printf("incoming_pdu_raw: \n"); 1206 mesh_network_dump_network_pdu(incoming_pdu_raw); 1207 #ifdef ENABLE_MESH_GATT_BEARER 1208 printf("gatt_bearer_network_pdu: \n"); 1209 mesh_network_dump_network_pdu(gatt_bearer_network_pdu); 1210 #endif 1211 #ifdef ENABLE_MESH_ADV_BEARER 1212 printf("adv_bearer_network_pdu: \n"); 1213 mesh_network_dump_network_pdu(adv_bearer_network_pdu); 1214 #endif 1215 1216 } 1217 void mesh_network_reset(void){ 1218 mesh_network_reset_network_pdus(&network_pdus_received); 1219 mesh_network_reset_network_pdus(&network_pdus_queued); 1220 mesh_network_reset_network_pdus(&network_pdus_outgoing_gatt); 1221 mesh_network_reset_network_pdus(&network_pdus_outgoing_adv); 1222 1223 // outgoing network pdus are owned by higher layer, so we don't free: 1224 // - adv_bearer_network_pdu 1225 // - gatt_bearer_network_pdu 1226 // - outoing_pdu 1227 // unless they are SEG ACK messages 1228 #ifdef ENABLE_MESH_ADV_BEARER 1229 if ((adv_bearer_network_pdu != NULL) && (adv_bearer_network_pdu->pdu_header.pdu_type == MESH_PDU_TYPE_SEGMENT_ACKNOWLEDGMENT)){ 1230 btstack_memory_mesh_network_pdu_free(adv_bearer_network_pdu); 1231 } 1232 adv_bearer_network_pdu = NULL; 1233 #endif 1234 #ifdef ENABLE_MESH_GATT_BEARER 1235 if ((gatt_bearer_network_pdu != NULL) && (gatt_bearer_network_pdu->pdu_header.pdu_type == MESH_PDU_TYPE_SEGMENT_ACKNOWLEDGMENT)){ 1236 btstack_memory_mesh_network_pdu_free(gatt_bearer_network_pdu); 1237 } 1238 gatt_bearer_network_pdu = NULL; 1239 #endif 1240 if ((outgoing_pdu != NULL) && (outgoing_pdu->pdu_header.pdu_type == MESH_PDU_TYPE_SEGMENT_ACKNOWLEDGMENT)){ 1241 btstack_memory_mesh_network_pdu_free(outgoing_pdu); 1242 } 1243 outgoing_pdu = NULL; 1244 1245 if (incoming_pdu_raw){ 1246 mesh_network_pdu_free(incoming_pdu_raw); 1247 incoming_pdu_raw = NULL; 1248 } 1249 if (incoming_pdu_decoded){ 1250 mesh_network_pdu_free(incoming_pdu_decoded); 1251 incoming_pdu_decoded = NULL; 1252 } 1253 mesh_crypto_active = 0; 1254 } 1255 1256 // buffer pool 1257 mesh_network_pdu_t * mesh_network_pdu_get(void){ 1258 mesh_network_pdu_t * network_pdu = btstack_memory_mesh_network_pdu_get(); 1259 if (network_pdu) { 1260 memset(network_pdu, 0, sizeof(mesh_network_pdu_t)); 1261 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_NETWORK; 1262 } 1263 return network_pdu; 1264 } 1265 1266 void mesh_network_pdu_free(mesh_network_pdu_t * network_pdu){ 1267 btstack_memory_mesh_network_pdu_free(network_pdu); 1268 if (mesh_network_free_pdu_callback!=NULL){ 1269 void (*callback)(void) = mesh_network_free_pdu_callback; 1270 mesh_network_free_pdu_callback= NULL; 1271 (*callback)(); 1272 } 1273 } 1274 1275 void mesh_network_notify_on_freed_pdu(void (*callback)(void)){ 1276 btstack_assert(mesh_network_free_pdu_callback == NULL); 1277 mesh_network_free_pdu_callback = callback; 1278 } 1279 1280 1281 // Mesh Subnet Management 1282 1283 void mesh_subnet_add(mesh_subnet_t * subnet){ 1284 btstack_linked_list_add_tail(&subnets, (btstack_linked_item_t *) subnet); 1285 } 1286 1287 void mesh_subnet_remove(mesh_subnet_t * subnet){ 1288 btstack_linked_list_remove(&subnets, (btstack_linked_item_t *) subnet); 1289 } 1290 1291 mesh_subnet_t * mesh_subnet_get_by_netkey_index(uint16_t netkey_index){ 1292 btstack_linked_list_iterator_t it; 1293 btstack_linked_list_iterator_init(&it, &subnets); 1294 while (btstack_linked_list_iterator_has_next(&it)){ 1295 mesh_subnet_t * item = (mesh_subnet_t *) btstack_linked_list_iterator_next(&it); 1296 if (item->netkey_index == netkey_index) return item; 1297 } 1298 return NULL; 1299 } 1300 1301 int mesh_subnet_list_count(void){ 1302 return btstack_linked_list_count(&subnets); 1303 } 1304 1305 // mesh network key iterator over all keys 1306 void mesh_subnet_iterator_init(mesh_subnet_iterator_t *it){ 1307 btstack_linked_list_iterator_init(&it->it, &subnets); 1308 } 1309 1310 int mesh_subnet_iterator_has_more(mesh_subnet_iterator_t *it){ 1311 return btstack_linked_list_iterator_has_next(&it->it); 1312 } 1313 1314 mesh_subnet_t * mesh_subnet_iterator_get_next(mesh_subnet_iterator_t *it){ 1315 return (mesh_subnet_t *) btstack_linked_list_iterator_next(&it->it); 1316 } 1317 1318 mesh_network_key_t * mesh_subnet_get_outgoing_network_key(mesh_subnet_t * subnet){ 1319 switch (subnet->key_refresh){ 1320 case MESH_KEY_REFRESH_SECOND_PHASE: 1321 return subnet->new_key; 1322 case MESH_KEY_REFRESH_NOT_ACTIVE: 1323 case MESH_KEY_REFRESH_FIRST_PHASE: 1324 default: 1325 return subnet->old_key; 1326 } 1327 } 1328 1329 /** 1330 * @brief Setup subnet for given netkey index 1331 */ 1332 void mesh_subnet_setup_for_netkey_index(uint16_t netkey_index){ 1333 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 1334 if (subnet != NULL) return; 1335 1336 // find old / new keys 1337 mesh_network_key_t * old_key = NULL; 1338 mesh_network_key_t * new_key = NULL; 1339 mesh_network_key_iterator_t it; 1340 mesh_network_key_iterator_init(&it); 1341 while (mesh_network_key_iterator_has_more(&it)){ 1342 mesh_network_key_t * network_key = mesh_network_key_iterator_get_next(&it); 1343 if (network_key->netkey_index != netkey_index) continue; 1344 if (old_key == NULL){ 1345 old_key = network_key; 1346 continue; 1347 } 1348 // assign current key depending on key version 1349 if (((int8_t) (network_key->version - new_key->version)) > 0) { 1350 new_key = network_key; 1351 } else { 1352 new_key = old_key; 1353 old_key = network_key; 1354 } 1355 } 1356 1357 // create subnet for netkey index 1358 subnet = btstack_memory_mesh_subnet_get(); 1359 if (subnet == NULL) return; 1360 subnet->netkey_index = netkey_index; 1361 mesh_subnet_add(subnet); 1362 1363 // set keys 1364 subnet->old_key = old_key; 1365 subnet->new_key = new_key; 1366 1367 // key refresh 1368 if (new_key == NULL){ 1369 // single key -> key refresh not active 1370 subnet->key_refresh = MESH_KEY_REFRESH_NOT_ACTIVE; 1371 } 1372 else { 1373 // two keys -> at least phase 1 1374 subnet->key_refresh = MESH_KEY_REFRESH_FIRST_PHASE; 1375 } 1376 } 1377