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_memory.h" 51 #include "btstack_event.h" 52 53 #ifdef ENABLE_MESH_ADV_BEARER 54 #include "mesh/adv_bearer.h" 55 #endif 56 57 #ifdef ENABLE_MESH_GATT_BEARER 58 #include "mesh/gatt_bearer.h" 59 #endif 60 61 // configuration 62 #define MESH_NETWORK_CACHE_SIZE 2 63 // #define ENABLE_MESH_RELAY 64 65 // debug config 66 // #define LOG_NETWORK 67 68 // structs 69 70 // globals 71 72 static uint32_t global_iv_index; 73 static uint16_t mesh_network_primary_address; 74 static uint16_t mesh_network_num_elements; 75 static void (*mesh_network_higher_layer_handler)(mesh_network_callback_type_t callback_type, mesh_network_pdu_t * network_pdu); 76 static void (*mesh_network_proxy_message_handler)(mesh_network_callback_type_t callback_type, mesh_network_pdu_t * network_pdu); 77 78 #ifdef ENABLE_MESH_GATT_BEARER 79 static hci_con_handle_t gatt_bearer_con_handle; 80 #endif 81 82 // shared send/receive crypto 83 static int mesh_crypto_active; 84 85 // crypto requests 86 static union { 87 btstack_crypto_ccm_t ccm; 88 btstack_crypto_aes128_t aes128; 89 } mesh_network_crypto_request; 90 91 static const mesh_network_key_t * current_network_key; 92 93 // PECB calculation 94 static uint8_t encryption_block[16]; 95 static uint8_t obfuscation_block[16]; 96 97 // Network Nonce 98 static uint8_t network_nonce[13]; 99 100 // INCOMING // 101 102 // unprocessed network pdu - added by mesh_network_pdus_received_message 103 static btstack_linked_list_t network_pdus_received; 104 105 // in validation 106 static mesh_network_pdu_t * network_pdu_in_validation; 107 static mesh_network_key_iterator_t validation_network_key_it; 108 109 // OUTGOING // 110 111 // Network PDUs queued by mesh_network_send 112 static btstack_linked_list_t network_pdus_queued; 113 114 // Network PDUs ready to send 115 static btstack_linked_list_t network_pdus_outgoing; 116 117 #ifdef ENABLE_MESH_ADV_BEARER 118 static mesh_network_pdu_t * adv_bearer_network_pdu; 119 #endif 120 121 #ifdef ENABLE_MESH_GATT_BEARER 122 static mesh_network_pdu_t * gatt_bearer_network_pdu; 123 #endif 124 125 // mesh network cache - we use 32-bit 'hashes' 126 static uint32_t mesh_network_cache[MESH_NETWORK_CACHE_SIZE]; 127 static int mesh_network_cache_index; 128 129 // prototypes 130 131 static void mesh_network_run(void); 132 static void process_network_pdu_validate(mesh_network_pdu_t * network_pdu); 133 134 // network caching 135 static uint32_t mesh_network_cache_hash(mesh_network_pdu_t * network_pdu){ 136 // - The SEQ field is a 24-bit integer that when combined with the IV Index, 137 // shall be a unique value for each new Network PDU originated by this node (=> SRC) 138 // - IV updates only rarely 139 // => 16 bit SRC, 1 bit IVI, 15 bit SEQ 140 uint8_t ivi = network_pdu->data[0] >> 7; 141 uint16_t seq = big_endian_read_16(network_pdu->data, 3); 142 uint16_t src = big_endian_read_16(network_pdu->data, 5); 143 return (src << 16) | (ivi << 15) | (seq & 0x7fff); 144 } 145 146 static int mesh_network_cache_find(uint32_t hash){ 147 int i; 148 for (i = 0; i < MESH_NETWORK_CACHE_SIZE; i++) { 149 if (mesh_network_cache[i] == hash) { 150 return 1; 151 } 152 } 153 return 0; 154 } 155 156 static void mesh_network_cache_add(uint32_t hash){ 157 mesh_network_cache[mesh_network_cache_index++] = hash; 158 if (mesh_network_cache_index >= MESH_NETWORK_CACHE_SIZE){ 159 mesh_network_cache_index = 0; 160 } 161 } 162 163 // common helper 164 int mesh_network_address_unicast(uint16_t addr){ 165 return addr < 0x8000; 166 } 167 168 int mesh_network_address_virtual(uint16_t addr){ 169 return (addr & 0xC000) == 0x8000; // 0b10xx xxxx xxxx xxxx 170 } 171 172 int mesh_network_address_group(uint16_t addr){ 173 return (addr & 0xC000) == 0xC000; // 0b11xx xxxx xxxx xxxx 174 } 175 176 int mesh_network_address_all_proxies(uint16_t addr){ 177 return addr == MESH_ADDRESS_ALL_PROXIES; 178 } 179 180 int mesh_network_address_all_nodes(uint16_t addr){ 181 return addr == MESH_ADDRESS_ALL_NODES; 182 } 183 184 int mesh_network_address_all_friends(uint16_t addr){ 185 return addr == MESH_ADDRESS_ALL_FRIENDS; 186 } 187 188 int mesh_network_address_all_relays(uint16_t addr){ 189 return addr == MESH_ADDRESS_ALL_RELAYS; 190 } 191 192 int mesh_network_addresses_valid(uint8_t ctl, uint16_t src, uint16_t dst){ 193 // printf("CTL: %u\n", ctl); 194 // printf("SRC: %04x\n", src); 195 // printf("DST: %04x\n", dst); 196 if (src == 0){ 197 // printf("SRC Unassigned Addr -> ignore\n"); 198 return 0; 199 } 200 if ((src & 0xC000) == 0x8000){ 201 // printf("SRC Virtual Addr -> ignore\n"); 202 return 0; 203 } 204 if ((src & 0xC000) == 0xC000){ 205 // printf("SRC Group Addr -> ignore\n"); 206 return 0; 207 } 208 if (dst == 0){ 209 // printf("DST Unassigned Addr -> ignore\n"); 210 return 0; 211 } 212 if ( ((dst & 0xC000) == 0x8000) && (ctl == 1)){ 213 // printf("DST Virtual Addr in CONTROL -> ignore\n"); 214 return 0; 215 } 216 if ( (0xFF00 <= dst) && (dst <= 0xfffb) && (ctl == 0) ){ 217 // printf("DST RFU Group Addr in MESSAGE -> ignore\n"); 218 return 0; 219 } 220 // printf("SRC + DST Addr valid\n"); 221 return 1; 222 } 223 224 static void mesh_network_create_nonce(uint8_t * nonce, const mesh_network_pdu_t * pdu, uint32_t iv_index){ 225 unsigned int pos = 0; 226 nonce[pos++] = 0x0; // Network Nonce 227 memcpy(&nonce[pos], &pdu->data[1], 6); 228 pos += 6; 229 big_endian_store_16(nonce, pos, 0); 230 pos += 2; 231 big_endian_store_32(nonce, pos, iv_index); 232 } 233 234 static void mesh_proxy_create_nonce(uint8_t * nonce, const mesh_network_pdu_t * pdu, uint32_t iv_index){ 235 unsigned int pos = 0; 236 nonce[pos++] = 0x3; // Proxy Nonce 237 nonce[pos++] = 0; 238 memcpy(&nonce[pos], &pdu->data[2], 5); 239 pos += 5; 240 big_endian_store_16(nonce, pos, 0); 241 pos += 2; 242 big_endian_store_32(nonce, pos, iv_index); 243 } 244 245 // NID/IVI | obfuscated (CTL/TTL, SEQ (24), SRC (16) ), encrypted ( DST(16), TransportPDU), MIC(32 or 64) 246 247 static void mesh_network_send_d(mesh_network_pdu_t * network_pdu){ 248 249 #ifdef LOG_NETWORK 250 printf("TX-D-NetworkPDU (%p): ", network_pdu); 251 printf_hexdump(network_pdu->data, network_pdu->len); 252 #endif 253 254 // add to queue 255 btstack_linked_list_add_tail(&network_pdus_outgoing, (btstack_linked_item_t *) network_pdu); 256 257 // go 258 mesh_network_run(); 259 } 260 261 // new 262 static void mesh_network_send_c(void *arg){ 263 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) arg; 264 265 // obfuscate 266 unsigned int i; 267 for (i=0;i<6;i++){ 268 network_pdu->data[1+i] ^= obfuscation_block[i]; 269 } 270 271 #ifdef LOG_NETWORK 272 printf("TX-C-NetworkPDU (%p): ", network_pdu); 273 printf_hexdump(network_pdu->data, network_pdu->len); 274 #endif 275 276 // crypto done 277 mesh_crypto_active = 0; 278 279 // done 280 (network_pdu->callback)(network_pdu); 281 } 282 283 static void mesh_network_send_b(void *arg){ 284 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) arg; 285 286 uint32_t iv_index = global_iv_index; 287 288 // store NetMIC 289 uint8_t net_mic[8]; 290 btstack_crypto_ccm_get_authentication_value(&mesh_network_crypto_request.ccm, net_mic); 291 292 // store MIC 293 uint8_t net_mic_len = network_pdu->data[1] & 0x80 ? 8 : 4; 294 memcpy(&network_pdu->data[network_pdu->len], net_mic, net_mic_len); 295 network_pdu->len += net_mic_len; 296 297 #ifdef LOG_NETWORK 298 printf("TX-B-NetworkPDU (%p): ", network_pdu); 299 printf_hexdump(network_pdu->data, network_pdu->len); 300 #endif 301 302 // calc PECB 303 memset(encryption_block, 0, 5); 304 big_endian_store_32(encryption_block, 5, iv_index); 305 memcpy(&encryption_block[9], &network_pdu->data[7], 7); 306 btstack_crypto_aes128_encrypt(&mesh_network_crypto_request.aes128, current_network_key->privacy_key, encryption_block, obfuscation_block, &mesh_network_send_c, network_pdu); 307 } 308 309 static void mesh_network_send_a(mesh_network_pdu_t * network_pdu){ 310 311 mesh_crypto_active = 1; 312 313 // lookup network by netkey_index 314 current_network_key = mesh_network_key_list_get(network_pdu->netkey_index); 315 if (!current_network_key) { 316 mesh_crypto_active = 0; 317 // notify upper layer 318 (*mesh_network_higher_layer_handler)(MESH_NETWORK_PDU_SENT, network_pdu); 319 // run again 320 mesh_network_run(); 321 return; 322 } 323 324 // get network nonce 325 if (network_pdu->flags & 1){ 326 mesh_proxy_create_nonce(network_nonce, network_pdu, global_iv_index); 327 #ifdef LOG_NETWORK 328 printf("TX-ProxyNonce: "); 329 printf_hexdump(network_nonce, 13); 330 #endif 331 } else { 332 mesh_network_create_nonce(network_nonce, network_pdu, global_iv_index); 333 #ifdef LOG_NETWORK 334 printf("TX-NetworkNonce: "); 335 printf_hexdump(network_nonce, 13); 336 #endif 337 } 338 339 #ifdef LOG_NETWORK 340 printf("TX-EncryptionKey: "); 341 printf_hexdump(current_network_key->encryption_key, 16); 342 #endif 343 344 // start ccm 345 uint8_t cypher_len = network_pdu->len - 7; 346 uint8_t net_mic_len = network_pdu->data[1] & 0x80 ? 8 : 4; 347 btstack_crypto_ccm_init(&mesh_network_crypto_request.ccm, current_network_key->encryption_key, network_nonce, cypher_len, 0, net_mic_len); 348 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); 349 } 350 351 void mesh_network_message_processed_by_higher_layer(mesh_network_pdu_t * network_pdu){ 352 #ifdef ENABLE_MESH_RELAY 353 uint8_t ctl_ttl = network_pdu->data[1]; 354 uint8_t ctl = ctl_ttl >> 7; 355 uint8_t ttl = ctl_ttl & 0x7f; 356 uint8_t net_mic_len = (ctl_ttl & 0x80) ? 8 : 4; 357 uint16_t src = big_endian_read_16(network_pdu->data, 5); 358 359 // check if address matches elements on our node and TTL >= 2 360 if (((src < mesh_network_primary_address) || (src > (mesh_network_primary_address + mesh_network_num_elements))) && (ttl >= 2)){ 361 // prepare pdu for resending 362 network_pdu->len -= net_mic_len; 363 network_pdu->data[1] = (ctl << 7) | (ttl - 1); 364 365 // queue up 366 network_pdu->callback = &mesh_network_send_d; 367 btstack_linked_list_add_tail(&network_pdus_queued, (btstack_linked_item_t *) network_pdu); 368 369 // go 370 mesh_network_run(); 371 372 return; 373 } 374 #endif 375 btstack_memory_mesh_network_pdu_free(network_pdu); 376 } 377 378 static void process_network_pdu_done(void){ 379 btstack_memory_mesh_network_pdu_free(network_pdu_in_validation); 380 network_pdu_in_validation = NULL; 381 mesh_crypto_active = 0; 382 383 mesh_network_run(); 384 } 385 386 static void process_network_pdu_validate_d(void * arg){ 387 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) arg; 388 389 uint8_t ctl_ttl = network_pdu->data[1]; 390 uint8_t ctl = ctl_ttl >> 7; 391 uint8_t net_mic_len = (ctl_ttl & 0x80) ? 8 : 4; 392 393 // store NetMIC 394 uint8_t net_mic[8]; 395 btstack_crypto_ccm_get_authentication_value(&mesh_network_crypto_request.ccm, net_mic); 396 #ifdef LOG_NETWORK 397 printf("RX-NetMIC: "); 398 printf_hexdump(net_mic, net_mic_len); 399 #endif 400 // store in pdu 401 memcpy(&network_pdu->data[network_pdu->len-net_mic_len], net_mic, net_mic_len); 402 403 #ifdef LOG_NETWORK 404 uint8_t cypher_len = network_pdu->len - 9 - net_mic_len; 405 printf("RX-Decrypted DST/TransportPDU: "); 406 printf_hexdump(&network_pdu->data[7], 2 + cypher_len); 407 408 printf("RX-Decrypted: "); 409 printf_hexdump(network_pdu->data, network_pdu->len); 410 #endif 411 412 // validate network mic 413 if (memcmp(net_mic, &network_pdu_in_validation->data[network_pdu->len-net_mic_len], net_mic_len) != 0){ 414 // fail 415 printf("RX-NetMIC mismatch, try next key\n"); 416 process_network_pdu_validate(network_pdu); 417 return; 418 } 419 420 // remove NetMIC from payload 421 network_pdu->len -= net_mic_len; 422 423 #ifdef LOG_NETWORK 424 // match 425 printf("RX-NetMIC matches\n"); 426 printf("RX-TTL: 0x%02x\n", network_pdu->data[1] & 0x7f); 427 #endif 428 429 // set netkey_index 430 network_pdu->netkey_index = current_network_key->netkey_index; 431 432 if (network_pdu->flags & 1){ 433 434 // no additional checks for proxy messages 435 (*mesh_network_proxy_message_handler)(MESH_NETWORK_PDU_RECEIVED, network_pdu); 436 437 } else { 438 439 // validate src/dest addresses 440 uint16_t src = big_endian_read_16(network_pdu->data, 5); 441 uint16_t dst = big_endian_read_16(network_pdu->data, 7); 442 int valid = mesh_network_addresses_valid(ctl, src, dst); 443 if (!valid){ 444 printf("RX Address invalid\n"); 445 btstack_memory_mesh_network_pdu_free(network_pdu); 446 process_network_pdu_done(); 447 return; 448 } 449 450 // check cache 451 uint32_t hash = mesh_network_cache_hash(network_pdu); 452 #ifdef LOG_NETWORK 453 printf("RX-Hash: %08x\n", hash); 454 #endif 455 if (mesh_network_cache_find(hash)){ 456 // found in cache, drop 457 printf("Found in cache -> drop packet\n"); 458 btstack_memory_mesh_network_pdu_free(network_pdu); 459 process_network_pdu_done(); 460 return; 461 } 462 463 // store in network cache 464 mesh_network_cache_add(hash); 465 466 // forward to lower transport layer. message is freed by call to mesh_network_message_processed_by_upper_layer 467 (*mesh_network_higher_layer_handler)(MESH_NETWORK_PDU_RECEIVED, network_pdu); 468 } 469 470 // done 471 process_network_pdu_done(); 472 } 473 474 static uint32_t iv_index_for_pdu(const mesh_network_pdu_t * network_pdu){ 475 // get IV Index and IVI 476 uint32_t iv_index = global_iv_index; 477 int ivi = network_pdu->data[0] >> 7; 478 479 // if least significant bit differs, use previous IV Index 480 if ((iv_index & 1 ) ^ ivi){ 481 iv_index--; 482 #ifdef LOG_NETWORK 483 printf("RX-IV: IVI indicates previous IV index, using 0x%08x\n", iv_index); 484 #endif 485 } 486 return iv_index; 487 } 488 489 static void process_network_pdu_validate_b(void * arg){ 490 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) arg; 491 492 #ifdef LOG_NETWORK 493 printf("RX-PECB: "); 494 printf_hexdump(obfuscation_block, 6); 495 #endif 496 497 // de-obfuscate 498 unsigned int i; 499 for (i=0;i<6;i++){ 500 network_pdu->data[1+i] = network_pdu_in_validation->data[1+i] ^ obfuscation_block[i]; 501 } 502 503 uint32_t iv_index = iv_index_for_pdu(network_pdu); 504 505 if (network_pdu->flags & 1){ 506 // create network nonce 507 mesh_proxy_create_nonce(network_nonce, network_pdu, iv_index); 508 #ifdef LOG_NETWORK 509 printf("RX-Proxy Nonce: "); 510 printf_hexdump(network_nonce, 13); 511 #endif 512 } else { 513 // create network nonce 514 mesh_network_create_nonce(network_nonce, network_pdu, iv_index); 515 #ifdef LOG_NETWORK 516 printf("RX-Network Nonce: "); 517 printf_hexdump(network_nonce, 13); 518 #endif 519 } 520 521 // 522 uint8_t ctl_ttl = network_pdu->data[1]; 523 uint8_t net_mic_len = (ctl_ttl & 0x80) ? 8 : 4; 524 uint8_t cypher_len = network_pdu->len - 7 - net_mic_len; 525 526 #ifdef LOG_NETWORK 527 printf("RX-Cyper len %u, mic len %u\n", cypher_len, net_mic_len); 528 529 printf("RX-Encryption Key: "); 530 printf_hexdump(current_network_key->encryption_key, 16); 531 532 #endif 533 534 btstack_crypto_ccm_init(&mesh_network_crypto_request.ccm, current_network_key->encryption_key, network_nonce, cypher_len, 0, net_mic_len); 535 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); 536 } 537 538 static void process_network_pdu_validate(mesh_network_pdu_t * network_pdu){ 539 if (!mesh_network_key_nid_iterator_has_more(&validation_network_key_it)){ 540 printf("No valid network key found\n"); 541 btstack_memory_mesh_network_pdu_free(network_pdu); 542 process_network_pdu_done(); 543 return; 544 } 545 546 current_network_key = mesh_network_key_nid_iterator_get_next(&validation_network_key_it); 547 548 // calc PECB 549 uint32_t iv_index = iv_index_for_pdu(network_pdu); 550 memset(encryption_block, 0, 5); 551 big_endian_store_32(encryption_block, 5, iv_index); 552 memcpy(&encryption_block[9], &network_pdu_in_validation->data[7], 7); 553 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); 554 } 555 556 557 static void process_network_pdu(mesh_network_pdu_t * network_pdu){ 558 // 559 uint8_t nid_ivi = network_pdu_in_validation->data[0]; 560 561 // setup pdu object 562 network_pdu->data[0] = nid_ivi; 563 network_pdu->len = network_pdu_in_validation->len; 564 network_pdu->flags = network_pdu_in_validation->flags; 565 566 // init provisioning data iterator 567 uint8_t nid = nid_ivi & 0x7f; 568 // uint8_t iv_index = network_pdu_data[0] >> 7; 569 mesh_network_key_nid_iterator_init(&validation_network_key_it, nid); 570 571 process_network_pdu_validate(network_pdu); 572 } 573 574 // static void mesh_network_encrypt_and_obfuscate(mesh_network_pdu_t * network_pdu, void (*callback)(mesh_network_pdu_t * network_pdu)){ 575 // network_pdu->callback = callback; 576 // } 577 578 static void mesh_network_run(void){ 579 if (!btstack_linked_list_empty(&network_pdus_outgoing)){ 580 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_outgoing); 581 582 #ifdef ENABLE_MESH_GATT_BEARER 583 // request to send via gatt 584 printf("mesh_network_run: pdu %p, proxy %u, con handle %4x\n", network_pdu, mesh_foundation_gatt_proxy_get(), gatt_bearer_con_handle); 585 if (network_pdu != NULL && mesh_foundation_gatt_proxy_get() != 0 && gatt_bearer_con_handle != HCI_CON_HANDLE_INVALID){ 586 gatt_bearer_network_pdu = network_pdu; 587 network_pdu = NULL; 588 gatt_bearer_request_can_send_now_for_network_pdu(); 589 } 590 #endif 591 #ifdef ENABLE_MESH_ADV_BEARER 592 // request to send via adv 593 if (network_pdu != NULL){ 594 adv_bearer_network_pdu = network_pdu; 595 network_pdu = NULL; 596 adv_bearer_request_can_send_now_for_network_pdu(); 597 } 598 #endif 599 if (network_pdu != NULL){ 600 // notify upper layer 601 (*mesh_network_higher_layer_handler)(MESH_NETWORK_PDU_SENT, network_pdu); 602 } 603 } 604 605 if (mesh_crypto_active) return; 606 607 if (!btstack_linked_list_empty(&network_pdus_received)){ 608 mesh_network_pdu_t * decode_pdu = mesh_network_pdu_get(); 609 if (!decode_pdu) return; 610 // get encoded network pdu and start processing 611 mesh_crypto_active = 1; 612 network_pdu_in_validation = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_received); 613 process_network_pdu(decode_pdu); 614 return; 615 } 616 617 if (!btstack_linked_list_empty(&network_pdus_queued)){ 618 // get queued network pdu and start processing 619 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&network_pdus_queued); 620 mesh_network_send_a(network_pdu); 621 return; 622 } 623 } 624 625 #ifdef ENABLE_MESH_ADV_BEARER 626 static void mesh_adv_bearer_handle_network_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 627 mesh_network_pdu_t * network_pdu; 628 629 switch (packet_type){ 630 case MESH_NETWORK_PACKET: 631 // check len. minimal transport PDU len = 1, 32 bit NetMIC -> 13 bytes 632 if (size < 13) break; 633 634 #ifdef LOG_NETWORK 635 printf("received network pdu from adv (len %u): ", size); 636 printf_hexdump(packet, size); 637 #endif 638 mesh_network_received_message(packet, size); 639 break; 640 641 case HCI_EVENT_PACKET: 642 switch(packet[0]){ 643 case HCI_EVENT_MESH_META: 644 switch(packet[2]){ 645 case MESH_SUBEVENT_CAN_SEND_NOW: 646 if (adv_bearer_network_pdu == NULL) break; 647 #ifdef LOG_NETWORK 648 printf("TX-E-NetworkPDU (%p): ", adv_bearer_network_pdu); 649 printf_hexdump(adv_bearer_network_pdu->data, adv_bearer_network_pdu->len); 650 #endif 651 adv_bearer_send_network_pdu(adv_bearer_network_pdu->data, adv_bearer_network_pdu->len); 652 network_pdu = adv_bearer_network_pdu; 653 adv_bearer_network_pdu = NULL; 654 655 // notify upper layer 656 (*mesh_network_higher_layer_handler)(MESH_NETWORK_PDU_SENT, network_pdu); 657 658 // check if more to send 659 mesh_network_run(); 660 break; 661 default: 662 break; 663 } 664 break; 665 default: 666 break; 667 } 668 break; 669 } 670 } 671 #endif 672 673 #ifdef ENABLE_MESH_GATT_BEARER 674 static void mesh_network_gatt_bearer_outgoing_complete(void){ 675 676 if (gatt_bearer_network_pdu == NULL) return; 677 678 #ifdef ENABLE_MESH_ADV_BEARER 679 // forward to adv bearer 680 adv_bearer_network_pdu = gatt_bearer_network_pdu; 681 gatt_bearer_network_pdu = NULL; 682 adv_bearer_request_can_send_now_for_network_pdu(); 683 return; 684 #endif 685 686 // done, notify upper layer 687 mesh_network_pdu_t * network_pdu = gatt_bearer_network_pdu; 688 gatt_bearer_network_pdu = NULL; 689 (*mesh_network_higher_layer_handler)(MESH_NETWORK_PDU_SENT, network_pdu); 690 } 691 692 static void mesh_network_gatt_bearer_handle_network_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 693 switch (packet_type){ 694 case MESH_PROXY_DATA_PACKET: 695 if (mesh_foundation_gatt_proxy_get() == 0) break; 696 #ifdef LOG_NETWORK 697 printf("received network pdu from gatt (len %u): ", size); 698 printf_hexdump(packet, size); 699 #endif 700 mesh_network_received_message(packet, size); 701 break; 702 case HCI_EVENT_PACKET: 703 switch (hci_event_packet_get_type(packet)){ 704 case HCI_EVENT_MESH_META: 705 switch (hci_event_mesh_meta_get_subevent_code(packet)){ 706 case MESH_SUBEVENT_PROXY_CONNECTED: 707 gatt_bearer_con_handle = mesh_subevent_proxy_connected_get_con_handle(packet); 708 break; 709 case MESH_SUBEVENT_PROXY_DISCONNECTED: 710 gatt_bearer_con_handle = HCI_CON_HANDLE_INVALID; 711 mesh_network_gatt_bearer_outgoing_complete(); 712 break; 713 case MESH_SUBEVENT_CAN_SEND_NOW: 714 if (gatt_bearer_network_pdu == NULL) break; 715 #ifdef LOG_NETWORK 716 printf("G-TX-E-NetworkPDU (%p): ", gatt_bearer_network_pdu); 717 printf_hexdump(gatt_bearer_network_pdu->data, gatt_bearer_network_pdu->len); 718 #endif 719 gatt_bearer_send_network_pdu(gatt_bearer_network_pdu->data, gatt_bearer_network_pdu->len); 720 break; 721 722 case MESH_SUBEVENT_MESSAGE_SENT: 723 mesh_network_gatt_bearer_outgoing_complete(); 724 break; 725 default: 726 break; 727 } 728 break; 729 default: 730 break; 731 } 732 break; 733 default: 734 break; 735 } 736 } 737 #endif 738 739 void mesh_network_init(void){ 740 #ifdef ENABLE_MESH_ADV_BEARER 741 adv_bearer_register_for_network_pdu(&mesh_adv_bearer_handle_network_event); 742 #endif 743 #ifdef ENABLE_MESH_GATT_BEARER 744 gatt_bearer_register_for_network_pdu(&mesh_network_gatt_bearer_handle_network_event); 745 gatt_bearer_con_handle = HCI_CON_HANDLE_INVALID; 746 #endif 747 } 748 749 void mesh_network_set_higher_layer_handler(void (*packet_handler)(mesh_network_callback_type_t callback_type, mesh_network_pdu_t * network_pdu)){ 750 mesh_network_higher_layer_handler = packet_handler; 751 } 752 753 void mesh_network_set_proxy_message_handler(void (*packet_handler)(mesh_network_callback_type_t callback_type, mesh_network_pdu_t * network_pdu)){ 754 mesh_network_proxy_message_handler = packet_handler; 755 } 756 757 void mesh_network_set_primary_element_address(uint16_t addr){ 758 mesh_network_primary_address = addr; 759 mesh_network_num_elements = 1; 760 } 761 762 void mesh_network_received_message(const uint8_t * pdu_data, uint8_t pdu_len){ 763 // verify len 764 if (pdu_len > 29) return; 765 766 // allocate network_pdu 767 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 768 if (!network_pdu) return; 769 770 // store data 771 memcpy(network_pdu->data, pdu_data, pdu_len); 772 network_pdu->len = pdu_len; 773 network_pdu->flags = 0; // Network PDU 774 775 // add to list and go 776 btstack_linked_list_add_tail(&network_pdus_received, (btstack_linked_item_t *) network_pdu); 777 mesh_network_run(); 778 779 } 780 781 void mesh_network_process_proxy_message(const uint8_t * pdu_data, uint8_t pdu_len){ 782 // verify len 783 if (pdu_len > 29) return; 784 785 // allocate network_pdu 786 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 787 if (!network_pdu) return; 788 789 // store data 790 memcpy(network_pdu->data, pdu_data, pdu_len); 791 network_pdu->len = pdu_len; 792 network_pdu->flags = 1; // Network PDU 793 794 // add to list and go 795 btstack_linked_list_add_tail(&network_pdus_received, (btstack_linked_item_t *) network_pdu); 796 mesh_network_run(); 797 } 798 799 void mesh_network_send_pdu(mesh_network_pdu_t * network_pdu){ 800 #ifdef LOG_NETWORK 801 printf("TX-A-NetworkPDU (%p): ", network_pdu); 802 printf_hexdump(network_pdu->data, network_pdu->len); 803 #endif 804 805 if (network_pdu->len > 29){ 806 printf("too long, %u\n", network_pdu->len); 807 return; 808 } 809 810 // setup callback 811 network_pdu->callback = &mesh_network_send_d; 812 network_pdu->flags = 0; 813 814 // queue up 815 btstack_linked_list_add_tail(&network_pdus_queued, (btstack_linked_item_t *) network_pdu); 816 817 // go 818 mesh_network_run(); 819 } 820 821 void mesh_network_encrypt_proxy_message(mesh_network_pdu_t * network_pdu, void (* callback)(mesh_network_pdu_t * callback)){ 822 printf("ProxyPDU(unencrypted): "); 823 printf_hexdump(network_pdu->data, network_pdu->len); 824 825 // setup callback 826 network_pdu->callback = callback; 827 network_pdu->flags = 1; 828 829 // queue up 830 btstack_linked_list_add_tail(&network_pdus_queued, (btstack_linked_item_t *) network_pdu); 831 832 // go 833 mesh_network_run(); 834 } 835 836 /* 837 * @brief Setup network pdu header 838 * @param netkey_index 839 * @param ctl 840 * @param ttl 841 * @param seq 842 * @param dest 843 */ 844 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){ 845 memset(network_pdu, 0, sizeof(mesh_network_pdu_t)); 846 // set netkey_index 847 network_pdu->netkey_index = netkey_index; 848 // setup header 849 network_pdu->data[network_pdu->len++] = (global_iv_index << 7) | nid; 850 uint8_t ctl_ttl = (ctl << 7) | (ttl & 0x7f); 851 network_pdu->data[network_pdu->len++] = ctl_ttl; 852 big_endian_store_24(network_pdu->data, 2, seq); 853 network_pdu->len += 3; 854 big_endian_store_16(network_pdu->data, network_pdu->len, src); 855 network_pdu->len += 2; 856 big_endian_store_16(network_pdu->data, network_pdu->len, dest); 857 network_pdu->len += 2; 858 memcpy(&network_pdu->data[network_pdu->len], transport_pdu_data, transport_pdu_len); 859 network_pdu->len += transport_pdu_len; 860 } 861 862 /* 863 * @brief Setup network pdu header 864 * @param netkey_index 865 * @param ctl 866 * @param ttl 867 * @param seq 868 * @param dest 869 */ 870 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){ 871 // set netkey_index 872 network_pdu->netkey_index = netkey_index; 873 // setup header 874 network_pdu->data[0] = (global_iv_index << 7) | nid; 875 uint8_t ctl_ttl = (ctl << 7) | (ttl & 0x7f); 876 network_pdu->data[1] = ctl_ttl; 877 big_endian_store_24(network_pdu->data, 2, seq); 878 big_endian_store_16(network_pdu->data, 5, src); 879 big_endian_store_16(network_pdu->data, 7, dest); 880 } 881 882 void mesh_set_iv_index(uint32_t iv_index){ 883 global_iv_index = iv_index; 884 } 885 886 uint32_t mesh_get_iv_index(void){ 887 return global_iv_index; 888 } 889 890 // Network PDU Getter 891 uint8_t mesh_network_nid(mesh_network_pdu_t * network_pdu){ 892 return network_pdu->data[0] & 0x7f; 893 } 894 uint16_t mesh_network_control(mesh_network_pdu_t * network_pdu){ 895 return network_pdu->data[1] & 0x80; 896 } 897 uint8_t mesh_network_ttl(mesh_network_pdu_t * network_pdu){ 898 return network_pdu->data[1] & 0x7f; 899 } 900 uint32_t mesh_network_seq(mesh_network_pdu_t * network_pdu){ 901 return big_endian_read_24(network_pdu->data, 2); 902 } 903 uint16_t mesh_network_src(mesh_network_pdu_t * network_pdu){ 904 return big_endian_read_16(network_pdu->data, 5); 905 } 906 uint16_t mesh_network_dst(mesh_network_pdu_t * network_pdu){ 907 return big_endian_read_16(network_pdu->data, 7); 908 } 909 int mesh_network_segmented(mesh_network_pdu_t * network_pdu){ 910 return network_pdu->data[9] & 0x80; 911 } 912 uint8_t * mesh_network_pdu_data(mesh_network_pdu_t * network_pdu){ 913 return &network_pdu->data[9]; 914 } 915 uint8_t mesh_network_pdu_len(mesh_network_pdu_t * network_pdu){ 916 return network_pdu->len - 9; 917 } 918 919 static void mesh_network_dump_network_pdu(mesh_network_pdu_t * network_pdu){ 920 if (network_pdu){ 921 printf("- %p: ", network_pdu); printf_hexdump(network_pdu->data, network_pdu->len); 922 } 923 } 924 static void mesh_network_dump_network_pdus(const char * name, btstack_linked_list_t * list){ 925 printf("List: %s:\n", name); 926 btstack_linked_list_iterator_t it; 927 btstack_linked_list_iterator_init(&it, list); 928 while (btstack_linked_list_iterator_has_next(&it)){ 929 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t*) btstack_linked_list_iterator_next(&it); 930 mesh_network_dump_network_pdu(network_pdu); 931 } 932 } 933 static void mesh_network_reset_network_pdus(btstack_linked_list_t * list){ 934 while (!btstack_linked_list_empty(list)){ 935 mesh_network_pdu_t * pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(list); 936 btstack_memory_mesh_network_pdu_free(pdu); 937 } 938 } 939 void mesh_network_dump(void){ 940 mesh_network_dump_network_pdus("network_pdus_received", &network_pdus_received); 941 mesh_network_dump_network_pdus("network_pdus_queued", &network_pdus_queued); 942 mesh_network_dump_network_pdus("network_pdus_outgoing", &network_pdus_outgoing); 943 printf("network_pdu_in_validation: \n"); 944 mesh_network_dump_network_pdu(network_pdu_in_validation); 945 } 946 void mesh_network_reset(void){ 947 mesh_network_reset_network_pdus(&network_pdus_received); 948 mesh_network_reset_network_pdus(&network_pdus_queued); 949 mesh_network_reset_network_pdus(&network_pdus_outgoing); 950 } 951 952 // buffer pool 953 mesh_network_pdu_t * mesh_network_pdu_get(void){ 954 mesh_network_pdu_t * network_pdu = btstack_memory_mesh_network_pdu_get(); 955 if (network_pdu) { 956 memset(network_pdu, 0, sizeof(mesh_network_pdu_t)); 957 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_NETWORK; 958 } 959 return network_pdu; 960 } 961 962 void mesh_network_pdu_free(mesh_network_pdu_t * network_pdu){ 963 btstack_memory_mesh_network_pdu_free(network_pdu); 964 } 965