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 <stdint.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include "mesh/beacon.h" 45 #include "provisioning.h" 46 #include "provisioning_device.h" 47 #include "mesh_keys.h" 48 #include "mesh_foundation.h" 49 #include "btstack_util.h" 50 #include "btstack_debug.h" 51 #include "btstack_event.h" 52 #include "btstack_memory.h" 53 #include "mesh_iv_index_seq_number.h" 54 #include "mesh_node.h" 55 56 #ifdef ENABLE_MESH_ADV_BEARER 57 #include "mesh/adv_bearer.h" 58 #endif 59 60 #ifdef ENABLE_MESH_GATT_BEARER 61 #include "mesh/gatt_bearer.h" 62 #endif 63 64 // configuration 65 #define MESH_NETWORK_CACHE_SIZE 2 66 // #define ENABLE_MESH_RELAY 67 68 // debug config 69 // #define LOG_NETWORK 70 71 // structs 72 73 // globals 74 75 static uint16_t mesh_network_num_elements; 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_primary_element_address_get(); 387 388 if (((src < mesh_network_primary_address) || (src > (mesh_network_primary_address + mesh_network_num_elements))) && (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 mesh_network_pdu_t * network_pdu; 689 690 switch (packet_type){ 691 case MESH_NETWORK_PACKET: 692 // check len. minimal transport PDU len = 1, 32 bit NetMIC -> 13 bytes 693 if (size < 13) break; 694 695 #ifdef LOG_NETWORK 696 printf("received network pdu from adv (len %u): ", size); 697 printf_hexdump(packet, size); 698 #endif 699 mesh_network_received_message(packet, size, 0); 700 break; 701 702 case HCI_EVENT_PACKET: 703 switch(packet[0]){ 704 case HCI_EVENT_MESH_META: 705 switch(packet[2]){ 706 case MESH_SUBEVENT_CAN_SEND_NOW: 707 if (adv_bearer_network_pdu == NULL) break; 708 #ifdef LOG_NETWORK 709 printf("TX-E-NetworkPDU (%p): ", adv_bearer_network_pdu); 710 printf_hexdump(adv_bearer_network_pdu->data, adv_bearer_network_pdu->len); 711 #endif 712 adv_bearer_send_network_pdu(adv_bearer_network_pdu->data, adv_bearer_network_pdu->len); 713 network_pdu = adv_bearer_network_pdu; 714 adv_bearer_network_pdu = NULL; 715 716 // notify upper layer 717 (*mesh_network_higher_layer_handler)(MESH_NETWORK_PDU_SENT, network_pdu); 718 719 // check if more to send 720 mesh_network_run(); 721 break; 722 default: 723 break; 724 } 725 break; 726 default: 727 break; 728 } 729 break; 730 } 731 } 732 #endif 733 734 #ifdef ENABLE_MESH_GATT_BEARER 735 static void mesh_network_gatt_bearer_outgoing_complete(void){ 736 737 if (gatt_bearer_network_pdu == NULL) return; 738 739 #ifdef ENABLE_MESH_ADV_BEARER 740 // forward to adv bearer 741 adv_bearer_network_pdu = gatt_bearer_network_pdu; 742 gatt_bearer_network_pdu = NULL; 743 adv_bearer_request_can_send_now_for_network_pdu(); 744 return; 745 #endif 746 747 // done, notify upper layer 748 mesh_network_pdu_t * network_pdu = gatt_bearer_network_pdu; 749 gatt_bearer_network_pdu = NULL; 750 (*mesh_network_higher_layer_handler)(MESH_NETWORK_PDU_SENT, network_pdu); 751 } 752 753 static void mesh_network_gatt_bearer_handle_network_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 754 switch (packet_type){ 755 case MESH_PROXY_DATA_PACKET: 756 if (mesh_foundation_gatt_proxy_get() == 0) break; 757 #ifdef LOG_NETWORK 758 printf("received network pdu from gatt (len %u): ", size); 759 printf_hexdump(packet, size); 760 #endif 761 mesh_network_received_message(packet, size, MESH_NETWORK_PDU_FLAGS_GATT_BEARER); 762 break; 763 case HCI_EVENT_PACKET: 764 switch (hci_event_packet_get_type(packet)){ 765 case HCI_EVENT_MESH_META: 766 switch (hci_event_mesh_meta_get_subevent_code(packet)){ 767 case MESH_SUBEVENT_PROXY_CONNECTED: 768 gatt_bearer_con_handle = mesh_subevent_proxy_connected_get_con_handle(packet); 769 break; 770 case MESH_SUBEVENT_PROXY_DISCONNECTED: 771 gatt_bearer_con_handle = HCI_CON_HANDLE_INVALID; 772 mesh_network_gatt_bearer_outgoing_complete(); 773 break; 774 case MESH_SUBEVENT_CAN_SEND_NOW: 775 if (gatt_bearer_network_pdu == NULL) break; 776 #ifdef LOG_NETWORK 777 printf("G-TX-E-NetworkPDU (%p): ", gatt_bearer_network_pdu); 778 printf_hexdump(gatt_bearer_network_pdu->data, gatt_bearer_network_pdu->len); 779 #endif 780 gatt_bearer_send_network_pdu(gatt_bearer_network_pdu->data, gatt_bearer_network_pdu->len); 781 break; 782 783 case MESH_SUBEVENT_MESSAGE_SENT: 784 mesh_network_gatt_bearer_outgoing_complete(); 785 break; 786 default: 787 break; 788 } 789 break; 790 default: 791 break; 792 } 793 break; 794 default: 795 break; 796 } 797 } 798 #endif 799 800 #ifdef ENABLE_MESH_GATT_BEARER 801 static void mesh_netework_gatt_bearer_handle_proxy_configuration(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 802 switch (packet_type){ 803 case MESH_PROXY_DATA_PACKET: 804 mesh_network_process_proxy_configuration_message(packet, size); 805 break; 806 case HCI_EVENT_PACKET: 807 switch (hci_event_packet_get_type(packet)){ 808 case HCI_EVENT_MESH_META: 809 switch (hci_event_mesh_meta_get_subevent_code(packet)){ 810 case MESH_SUBEVENT_CAN_SEND_NOW: 811 // forward to higher layer 812 (*mesh_network_proxy_message_handler)(MESH_NETWORK_CAN_SEND_NOW, NULL); 813 break; 814 default: 815 break; 816 } 817 break; 818 default: 819 break; 820 } 821 break; 822 default: 823 break; 824 } 825 } 826 #endif 827 828 void mesh_network_init(void){ 829 #ifdef ENABLE_MESH_ADV_BEARER 830 adv_bearer_register_for_network_pdu(&mesh_adv_bearer_handle_network_event); 831 #endif 832 #ifdef ENABLE_MESH_GATT_BEARER 833 gatt_bearer_con_handle = HCI_CON_HANDLE_INVALID; 834 gatt_bearer_register_for_network_pdu(&mesh_network_gatt_bearer_handle_network_event); 835 gatt_bearer_register_for_mesh_proxy_configuration(&mesh_netework_gatt_bearer_handle_proxy_configuration); 836 #endif 837 mesh_network_num_elements = 1; 838 } 839 840 void mesh_network_set_higher_layer_handler(void (*packet_handler)(mesh_network_callback_type_t callback_type, mesh_network_pdu_t * network_pdu)){ 841 mesh_network_higher_layer_handler = packet_handler; 842 } 843 844 void mesh_network_set_proxy_message_handler(void (*packet_handler)(mesh_network_callback_type_t callback_type, mesh_network_pdu_t * network_pdu)){ 845 mesh_network_proxy_message_handler = packet_handler; 846 } 847 848 void mesh_network_received_message(const uint8_t * pdu_data, uint8_t pdu_len, uint8_t flags){ 849 // verify len 850 if (pdu_len > 29) return; 851 852 // allocate network_pdu 853 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 854 if (!network_pdu) return; 855 856 // store data 857 memcpy(network_pdu->data, pdu_data, pdu_len); 858 network_pdu->len = pdu_len; 859 network_pdu->flags = flags; 860 861 // add to list and go 862 btstack_linked_list_add_tail(&network_pdus_received, (btstack_linked_item_t *) network_pdu); 863 mesh_network_run(); 864 865 } 866 867 void mesh_network_process_proxy_configuration_message(const uint8_t * pdu_data, uint8_t pdu_len){ 868 // verify len 869 if (pdu_len > 29) return; 870 871 // allocate network_pdu 872 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 873 if (!network_pdu) return; 874 875 // store data 876 memcpy(network_pdu->data, pdu_data, pdu_len); 877 network_pdu->len = pdu_len; 878 network_pdu->flags = MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION; // Network PDU 879 880 // add to list and go 881 btstack_linked_list_add_tail(&network_pdus_received, (btstack_linked_item_t *) network_pdu); 882 mesh_network_run(); 883 } 884 885 void mesh_network_send_pdu(mesh_network_pdu_t * network_pdu){ 886 #ifdef LOG_NETWORK 887 printf("TX-A-NetworkPDU (%p): ", network_pdu); 888 printf_hexdump(network_pdu->data, network_pdu->len); 889 #endif 890 891 if (network_pdu->len > 29){ 892 printf("too long, %u\n", network_pdu->len); 893 return; 894 } 895 896 // setup callback 897 network_pdu->callback = &mesh_network_send_d; 898 network_pdu->flags = 0; 899 900 // queue up 901 btstack_linked_list_add_tail(&network_pdus_queued, (btstack_linked_item_t *) network_pdu); 902 903 // go 904 mesh_network_run(); 905 } 906 907 void mesh_network_encrypt_proxy_configuration_message(mesh_network_pdu_t * network_pdu, void (* callback)(mesh_network_pdu_t * callback)){ 908 printf("ProxyPDU(unencrypted): "); 909 printf_hexdump(network_pdu->data, network_pdu->len); 910 911 // setup callback 912 network_pdu->callback = callback; 913 network_pdu->flags = MESH_NETWORK_PDU_FLAGS_PROXY_CONFIGURATION; 914 915 // queue up 916 btstack_linked_list_add_tail(&network_pdus_queued, (btstack_linked_item_t *) network_pdu); 917 918 // go 919 mesh_network_run(); 920 } 921 922 /* 923 * @brief Setup network pdu header 924 * @param netkey_index 925 * @param ctl 926 * @param ttl 927 * @param seq 928 * @param dest 929 */ 930 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){ 931 memset(network_pdu, 0, sizeof(mesh_network_pdu_t)); 932 // set netkey_index 933 network_pdu->netkey_index = netkey_index; 934 // setup header 935 network_pdu->data[network_pdu->len++] = (mesh_get_iv_index_for_tx() << 7) | nid; 936 uint8_t ctl_ttl = (ctl << 7) | (ttl & 0x7f); 937 network_pdu->data[network_pdu->len++] = ctl_ttl; 938 big_endian_store_24(network_pdu->data, 2, seq); 939 network_pdu->len += 3; 940 big_endian_store_16(network_pdu->data, network_pdu->len, src); 941 network_pdu->len += 2; 942 big_endian_store_16(network_pdu->data, network_pdu->len, dest); 943 network_pdu->len += 2; 944 memcpy(&network_pdu->data[network_pdu->len], transport_pdu_data, transport_pdu_len); 945 network_pdu->len += transport_pdu_len; 946 } 947 948 /* 949 * @brief Setup network pdu header 950 * @param netkey_index 951 * @param ctl 952 * @param ttl 953 * @param seq 954 * @param dest 955 */ 956 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){ 957 // set netkey_index 958 network_pdu->netkey_index = netkey_index; 959 // setup header 960 network_pdu->data[0] = (mesh_get_iv_index_for_tx() << 7) | nid; 961 uint8_t ctl_ttl = (ctl << 7) | (ttl & 0x7f); 962 network_pdu->data[1] = ctl_ttl; 963 big_endian_store_24(network_pdu->data, 2, seq); 964 big_endian_store_16(network_pdu->data, 5, src); 965 big_endian_store_16(network_pdu->data, 7, dest); 966 } 967 968 // Network PDU Getter 969 uint8_t mesh_network_nid(mesh_network_pdu_t * network_pdu){ 970 return network_pdu->data[0] & 0x7f; 971 } 972 uint16_t mesh_network_control(mesh_network_pdu_t * network_pdu){ 973 return network_pdu->data[1] & 0x80; 974 } 975 uint8_t mesh_network_ttl(mesh_network_pdu_t * network_pdu){ 976 return network_pdu->data[1] & 0x7f; 977 } 978 uint32_t mesh_network_seq(mesh_network_pdu_t * network_pdu){ 979 return big_endian_read_24(network_pdu->data, 2); 980 } 981 uint16_t mesh_network_src(mesh_network_pdu_t * network_pdu){ 982 return big_endian_read_16(network_pdu->data, 5); 983 } 984 uint16_t mesh_network_dst(mesh_network_pdu_t * network_pdu){ 985 return big_endian_read_16(network_pdu->data, 7); 986 } 987 int mesh_network_segmented(mesh_network_pdu_t * network_pdu){ 988 return network_pdu->data[9] & 0x80; 989 } 990 uint8_t * mesh_network_pdu_data(mesh_network_pdu_t * network_pdu){ 991 return &network_pdu->data[9]; 992 } 993 uint8_t mesh_network_pdu_len(mesh_network_pdu_t * network_pdu){ 994 return network_pdu->len - 9; 995 } 996 997 static void mesh_network_dump_network_pdu(mesh_network_pdu_t * network_pdu){ 998 if (network_pdu){ 999 printf("- %p: ", network_pdu); printf_hexdump(network_pdu->data, network_pdu->len); 1000 } 1001 } 1002 static void mesh_network_dump_network_pdus(const char * name, btstack_linked_list_t * list){ 1003 printf("List: %s:\n", name); 1004 btstack_linked_list_iterator_t it; 1005 btstack_linked_list_iterator_init(&it, list); 1006 while (btstack_linked_list_iterator_has_next(&it)){ 1007 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t*) btstack_linked_list_iterator_next(&it); 1008 mesh_network_dump_network_pdu(network_pdu); 1009 } 1010 } 1011 static void mesh_network_reset_network_pdus(btstack_linked_list_t * list){ 1012 while (!btstack_linked_list_empty(list)){ 1013 mesh_network_pdu_t * pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(list); 1014 btstack_memory_mesh_network_pdu_free(pdu); 1015 } 1016 } 1017 void mesh_network_dump(void){ 1018 mesh_network_dump_network_pdus("network_pdus_received", &network_pdus_received); 1019 mesh_network_dump_network_pdus("network_pdus_queued", &network_pdus_queued); 1020 mesh_network_dump_network_pdus("network_pdus_outgoing", &network_pdus_outgoing); 1021 printf("network_pdu_in_validation: \n"); 1022 mesh_network_dump_network_pdu(network_pdu_in_validation); 1023 } 1024 void mesh_network_reset(void){ 1025 mesh_network_reset_network_pdus(&network_pdus_received); 1026 mesh_network_reset_network_pdus(&network_pdus_queued); 1027 mesh_network_reset_network_pdus(&network_pdus_outgoing); 1028 } 1029 1030 // buffer pool 1031 mesh_network_pdu_t * mesh_network_pdu_get(void){ 1032 mesh_network_pdu_t * network_pdu = btstack_memory_mesh_network_pdu_get(); 1033 if (network_pdu) { 1034 memset(network_pdu, 0, sizeof(mesh_network_pdu_t)); 1035 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_NETWORK; 1036 } 1037 return network_pdu; 1038 } 1039 1040 void mesh_network_pdu_free(mesh_network_pdu_t * network_pdu){ 1041 btstack_memory_mesh_network_pdu_free(network_pdu); 1042 } 1043 1044 // Mesh Subnet Management 1045 1046 void mesh_subnet_add(mesh_subnet_t * subnet){ 1047 btstack_linked_list_add_tail(&subnets, (btstack_linked_item_t *) subnet); 1048 } 1049 1050 void mesh_subnet_remove(mesh_subnet_t * subnet){ 1051 btstack_linked_list_remove(&subnets, (btstack_linked_item_t *) subnet); 1052 } 1053 1054 mesh_subnet_t * mesh_subnet_get_by_netkey_index(uint16_t netkey_index){ 1055 btstack_linked_list_iterator_t it; 1056 btstack_linked_list_iterator_init(&it, &subnets); 1057 while (btstack_linked_list_iterator_has_next(&it)){ 1058 mesh_subnet_t * item = (mesh_subnet_t *) btstack_linked_list_iterator_next(&it); 1059 if (item->netkey_index == netkey_index) return item; 1060 } 1061 return NULL; 1062 } 1063 1064 int mesh_subnet_list_count(void){ 1065 return btstack_linked_list_count(&subnets); 1066 } 1067 1068 // mesh network key iterator over all keys 1069 void mesh_subnet_iterator_init(mesh_subnet_iterator_t *it){ 1070 btstack_linked_list_iterator_init(&it->it, &subnets); 1071 } 1072 1073 int mesh_subnet_iterator_has_more(mesh_subnet_iterator_t *it){ 1074 return btstack_linked_list_iterator_has_next(&it->it); 1075 } 1076 1077 mesh_subnet_t * mesh_subnet_iterator_get_next(mesh_subnet_iterator_t *it){ 1078 return (mesh_subnet_t *) btstack_linked_list_iterator_next(&it->it); 1079 } 1080 1081 mesh_network_key_t * mesh_subnet_get_outgoing_network_key(mesh_subnet_t * subnet){ 1082 switch (subnet->key_refresh){ 1083 case MESH_KEY_REFRESH_SECOND_PHASE: 1084 return subnet->new_key; 1085 case MESH_KEY_REFRESH_NOT_ACTIVE: 1086 case MESH_KEY_REFRESH_FIRST_PHASE: 1087 default: 1088 return subnet->old_key; 1089 } 1090 } 1091 1092 /** 1093 * @brief Setup subnet for given netkey index 1094 */ 1095 void mesh_subnet_setup_for_netkey_index(uint16_t netkey_index){ 1096 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 1097 if (subnet != NULL) return; 1098 1099 // find old / new keys 1100 mesh_network_key_t * old_key = NULL; 1101 mesh_network_key_t * new_key = NULL; 1102 mesh_network_key_iterator_t it; 1103 mesh_network_key_iterator_init(&it); 1104 while (mesh_network_key_iterator_has_more(&it)){ 1105 mesh_network_key_t * network_key = mesh_network_key_iterator_get_next(&it); 1106 if (network_key->netkey_index != netkey_index) continue; 1107 if (old_key == NULL){ 1108 old_key = network_key; 1109 continue; 1110 } 1111 // assign current key depending on key version 1112 if (((int8_t) (network_key->version - new_key->version)) > 0) { 1113 new_key = network_key; 1114 } else { 1115 new_key = old_key; 1116 old_key = network_key; 1117 } 1118 } 1119 1120 // create subnet for netkey index 1121 subnet = btstack_memory_mesh_subnet_get(); 1122 if (subnet == NULL) return; 1123 subnet->netkey_index = netkey_index; 1124 mesh_subnet_add(subnet); 1125 1126 // set keys 1127 subnet->old_key = old_key; 1128 subnet->new_key = new_key; 1129 1130 // key refresh 1131 if (new_key == NULL){ 1132 // single key -> key refresh not active 1133 subnet->key_refresh = MESH_KEY_REFRESH_NOT_ACTIVE; 1134 } 1135 else { 1136 // two keys -> at least phase 1 1137 subnet->key_refresh = MESH_KEY_REFRESH_FIRST_PHASE; 1138 } 1139 } 1140