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