1 /* 2 * Copyright (C) 2014 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_upper_transport.c" 39 40 #include "mesh/mesh_upper_transport.h" 41 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #include "btstack_util.h" 47 #include "btstack_memory.h" 48 #include "btstack_debug.h" 49 50 #include "mesh/beacon.h" 51 #include "mesh/mesh_iv_index_seq_number.h" 52 #include "mesh/mesh_keys.h" 53 #include "mesh/mesh_lower_transport.h" 54 #include "mesh/mesh_peer.h" 55 #include "mesh/mesh_virtual_addresses.h" 56 57 // TODO: extract mesh_pdu functions into lower transport or network 58 #include "mesh/mesh_access.h" 59 60 static void (*higher_layer_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 61 62 static void mesh_print_hex(const char * name, const uint8_t * data, uint16_t len){ 63 printf("%-20s ", name); 64 printf_hexdump(data, len); 65 } 66 // static void mesh_print_x(const char * name, uint32_t value){ 67 // printf("%20s: 0x%x", name, (int) value); 68 // } 69 70 71 // combined key x address iterator for upper transport decryption 72 73 typedef struct { 74 // state 75 mesh_transport_key_iterator_t key_it; 76 mesh_virtual_address_iterator_t address_it; 77 // elements 78 const mesh_transport_key_t * key; 79 const mesh_virtual_address_t * address; 80 // address - might be virtual 81 uint16_t dst; 82 // key info 83 } mesh_transport_key_and_virtual_address_iterator_t; 84 85 static void mesh_transport_key_and_virtual_address_iterator_init(mesh_transport_key_and_virtual_address_iterator_t *it, 86 uint16_t dst, uint16_t netkey_index, uint8_t akf, 87 uint8_t aid) { 88 printf("KEY_INIT: dst %04x, akf %x, aid %x\n", dst, akf, aid); 89 // config 90 it->dst = dst; 91 // init elements 92 it->key = NULL; 93 it->address = NULL; 94 // init element iterators 95 mesh_transport_key_aid_iterator_init(&it->key_it, netkey_index, akf, aid); 96 // init address iterator 97 if (mesh_network_address_virtual(it->dst)){ 98 mesh_virtual_address_iterator_init(&it->address_it, dst); 99 // get first key 100 if (mesh_transport_key_aid_iterator_has_more(&it->key_it)) { 101 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 102 } 103 } 104 } 105 106 // cartesian product: keys x addressses 107 static int mesh_transport_key_and_virtual_address_iterator_has_more(mesh_transport_key_and_virtual_address_iterator_t * it){ 108 if (mesh_network_address_virtual(it->dst)) { 109 // find next valid entry 110 while (true){ 111 if (mesh_virtual_address_iterator_has_more(&it->address_it)) return 1; 112 if (!mesh_transport_key_aid_iterator_has_more(&it->key_it)) return 0; 113 // get next key 114 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 115 mesh_virtual_address_iterator_init(&it->address_it, it->dst); 116 } 117 } else { 118 return mesh_transport_key_aid_iterator_has_more(&it->key_it); 119 } 120 } 121 122 static void mesh_transport_key_and_virtual_address_iterator_next(mesh_transport_key_and_virtual_address_iterator_t * it){ 123 if (mesh_network_address_virtual(it->dst)) { 124 it->address = mesh_virtual_address_iterator_get_next(&it->address_it); 125 } else { 126 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 127 } 128 } 129 130 // UPPER TRANSPORT 131 132 // stub lower transport 133 134 static void mesh_upper_transport_validate_unsegmented_message(void); 135 static void mesh_upper_transport_validate_segmented_message(void); 136 137 static void mesh_upper_transport_run(void); 138 139 static int crypto_active; 140 static mesh_network_pdu_t * incoming_network_pdu_raw; 141 static mesh_network_pdu_t * incoming_network_pdu_decoded; 142 static mesh_transport_pdu_t incoming_transport_pdu_singleton; 143 static mesh_transport_pdu_t * incoming_transport_pdu_raw; 144 static mesh_transport_pdu_t * incoming_transport_pdu_decoded; 145 static mesh_message_pdu_t incoming_message_pdu_singleton; 146 static uint8_t application_nonce[13]; 147 static btstack_crypto_ccm_t ccm; 148 static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; 149 150 // upper transport callbacks - in access layer 151 static void (*mesh_access_message_handler)(mesh_pdu_t * pdu); 152 static void (*mesh_control_message_handler)(mesh_pdu_t * pdu); 153 154 // incoming unsegmented (network) and segmented (transport) control and access messages 155 static btstack_linked_list_t upper_transport_incoming; 156 157 // outgoing unsegmented (network) and segmented (uppert_transport_outgoing) control and access messages 158 static btstack_linked_list_t upper_transport_outgoing; 159 160 static void mesh_upper_transport_dump_pdus(const char *name, btstack_linked_list_t *list){ 161 printf("List: %s:\n", name); 162 btstack_linked_list_iterator_t it; 163 btstack_linked_list_iterator_init(&it, list); 164 while (btstack_linked_list_iterator_has_next(&it)){ 165 mesh_pdu_t * pdu = (mesh_pdu_t*) btstack_linked_list_iterator_next(&it); 166 printf("- %p\n", pdu); 167 // printf_hexdump( mesh_pdu_data(pdu), mesh_pdu_len(pdu)); 168 } 169 } 170 171 static void mesh_upper_transport_reset_pdus(btstack_linked_list_t *list){ 172 while (!btstack_linked_list_empty(list)){ 173 mesh_upper_transport_pdu_free((mesh_pdu_t *) btstack_linked_list_pop(list)); 174 } 175 } 176 177 void mesh_upper_transport_dump(void){ 178 printf("incoming_network_pdu_raw: %p\n", incoming_network_pdu_raw); 179 printf("incoming_network_pdu_decoded: %p\n", incoming_network_pdu_decoded); 180 mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); 181 } 182 183 void mesh_upper_transport_reset(void){ 184 crypto_active = 0; 185 if (incoming_network_pdu_raw){ 186 mesh_network_pdu_free(incoming_network_pdu_raw); 187 incoming_network_pdu_raw = NULL; 188 } 189 // if (incoming_network_pdu_decoded){ 190 // mesh_network_pdu_free(incoming_network_pdu_decoded); 191 // incoming_network_pdu_decoded = NULL; 192 // } 193 mesh_upper_transport_reset_pdus(&upper_transport_incoming); 194 } 195 196 static void mesh_upper_unsegmented_control_message_received(mesh_network_pdu_t * network_pdu){ 197 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 198 uint8_t opcode = lower_transport_pdu[0]; 199 if (mesh_control_message_handler){ 200 mesh_control_message_handler((mesh_pdu_t*) network_pdu); 201 } else { 202 printf("[!] Unhandled Control message with opcode %02x\n", opcode); 203 // done 204 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) network_pdu); 205 } 206 } 207 208 static void mesh_upper_transport_process_message_done(mesh_message_pdu_t *message_pdu){ 209 crypto_active = 0; 210 btstack_assert(message_pdu == &incoming_message_pdu_singleton); 211 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&incoming_message_pdu_singleton.segments); 212 if (mesh_network_control(network_pdu)) { 213 btstack_assert(0); 214 } else { 215 btstack_assert(network_pdu != NULL); 216 mesh_network_pdu_free(network_pdu); 217 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) incoming_network_pdu_raw); 218 incoming_network_pdu_raw = NULL; 219 } 220 mesh_upper_transport_run(); 221 } 222 223 static void mesh_upper_transport_process_unsegmented_message_done(mesh_network_pdu_t *network_pdu){ 224 crypto_active = 0; 225 if (mesh_network_control(network_pdu)) { 226 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) network_pdu); 227 } else { 228 mesh_network_pdu_free(network_pdu); 229 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) incoming_network_pdu_raw); 230 incoming_network_pdu_raw = NULL; 231 } 232 mesh_upper_transport_run(); 233 } 234 235 static void mesh_upper_transport_process_segmented_message_done(mesh_transport_pdu_t *transport_pdu){ 236 crypto_active = 0; 237 if (mesh_transport_ctl(transport_pdu)) { 238 btstack_assert(0); 239 } else { 240 mesh_transport_pdu_free(transport_pdu); 241 incoming_transport_pdu_raw = NULL; 242 } 243 mesh_upper_transport_run(); 244 } 245 246 static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ 247 // get IV Index and IVI 248 uint32_t iv_index = mesh_get_iv_index(); 249 int ivi = ivi_nid >> 7; 250 251 // if least significant bit differs, use previous IV Index 252 if ((iv_index & 1 ) ^ ivi){ 253 iv_index--; 254 } 255 return iv_index; 256 } 257 258 static void transport_unsegmented_setup_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ 259 nonce[1] = 0x00; // SZMIC if a Segmented Access message or 0 for all other message formats 260 (void)memcpy(&nonce[2], &network_pdu->data[2], 7); 261 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(network_pdu->data[0])); 262 } 263 264 static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_transport_pdu_t * transport_pdu){ 265 nonce[1] = transport_pdu->transmic_len == 8 ? 0x80 : 0x00; 266 (void)memcpy(&nonce[2], &transport_pdu->network_header[2], 7); 267 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(transport_pdu->network_header[0])); 268 } 269 270 static void transport_unsegmented_setup_application_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ 271 nonce[0] = 0x01; 272 transport_unsegmented_setup_nonce(nonce, network_pdu); 273 mesh_print_hex("AppNonce", nonce, 13); 274 } 275 276 static void transport_unsegmented_setup_device_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ 277 nonce[0] = 0x02; 278 transport_unsegmented_setup_nonce(nonce, network_pdu); 279 mesh_print_hex("DeviceNonce", nonce, 13); 280 } 281 282 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_transport_pdu_t * transport_pdu){ 283 nonce[0] = 0x01; 284 transport_segmented_setup_nonce(nonce, transport_pdu); 285 mesh_print_hex("AppNonce", nonce, 13); 286 } 287 288 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_transport_pdu_t * transport_pdu){ 289 nonce[0] = 0x02; 290 transport_segmented_setup_nonce(nonce, transport_pdu); 291 mesh_print_hex("DeviceNonce", nonce, 13); 292 } 293 294 static void mesh_upper_transport_validate_unsegmented_message_ccm(void * arg){ 295 UNUSED(arg); 296 297 uint8_t * lower_transport_pdu = mesh_network_pdu_data(incoming_network_pdu_decoded); 298 uint8_t trans_mic_len = 4; 299 300 // store TransMIC 301 uint8_t trans_mic[8]; 302 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 303 mesh_print_hex("TransMIC", trans_mic, trans_mic_len); 304 305 uint8_t * upper_transport_pdu = mesh_network_pdu_data(incoming_network_pdu_decoded) + 1; 306 uint8_t upper_transport_pdu_len = mesh_network_pdu_len(incoming_network_pdu_decoded) - 1; 307 308 mesh_print_hex("Decryted PDU", upper_transport_pdu, upper_transport_pdu_len - trans_mic_len); 309 310 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len - trans_mic_len], trans_mic_len) == 0){ 311 printf("TransMIC matches\n"); 312 313 // remove TransMIC from payload 314 incoming_network_pdu_decoded->len -= trans_mic_len; 315 316 // if virtual address, update dst to pseudo_dst 317 if (mesh_network_address_virtual(mesh_network_dst(incoming_network_pdu_decoded))){ 318 big_endian_store_16(incoming_network_pdu_decoded->data, 7, mesh_transport_key_it.address->pseudo_dst); 319 } 320 321 // pass to upper layer 322 if (mesh_access_message_handler){ 323 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_network_pdu_decoded; 324 incoming_network_pdu_decoded = NULL; 325 mesh_access_message_handler((mesh_pdu_t*) &incoming_message_pdu_singleton); 326 } else { 327 printf("[!] Unhandled Unsegmented Access message\n"); 328 // done 329 mesh_upper_transport_process_unsegmented_message_done(incoming_network_pdu_decoded); 330 } 331 332 printf("\n"); 333 } else { 334 uint8_t afk = lower_transport_pdu[0] & 0x40; 335 if (afk){ 336 printf("TransMIC does not match, try next key\n"); 337 mesh_upper_transport_validate_unsegmented_message(); 338 } else { 339 printf("TransMIC does not match device key, done\n"); 340 // done 341 mesh_upper_transport_process_unsegmented_message_done(incoming_network_pdu_decoded); 342 } 343 } 344 } 345 346 static void mesh_upper_transport_validate_segmented_message_ccm(void * arg){ 347 UNUSED(arg); 348 349 uint8_t * upper_transport_pdu = incoming_transport_pdu_decoded->data; 350 uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->transmic_len; 351 352 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 353 354 // store TransMIC 355 uint8_t trans_mic[8]; 356 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 357 mesh_print_hex("TransMIC", trans_mic, incoming_transport_pdu_decoded->transmic_len); 358 359 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], incoming_transport_pdu_decoded->transmic_len) == 0){ 360 printf("TransMIC matches\n"); 361 362 // remove TransMIC from payload 363 incoming_transport_pdu_decoded->len -= incoming_transport_pdu_decoded->transmic_len; 364 365 // if virtual address, update dst to pseudo_dst 366 if (mesh_network_address_virtual(mesh_transport_dst(incoming_transport_pdu_decoded))){ 367 big_endian_store_16(incoming_transport_pdu_decoded->network_header, 7, mesh_transport_key_it.address->pseudo_dst); 368 } 369 370 // pass to upper layer 371 if (mesh_access_message_handler){ 372 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_transport_pdu_decoded; 373 incoming_network_pdu_decoded = NULL; 374 mesh_access_message_handler(pdu); 375 } else { 376 printf("[!] Unhandled Segmented Access/Control message\n"); 377 // done 378 mesh_upper_transport_process_segmented_message_done(incoming_transport_pdu_decoded); 379 } 380 381 printf("\n"); 382 383 } else { 384 uint8_t akf = incoming_transport_pdu_decoded->akf_aid_control & 0x40; 385 if (akf){ 386 printf("TransMIC does not match, try next key\n"); 387 mesh_upper_transport_validate_segmented_message(); 388 } else { 389 printf("TransMIC does not match device key, done\n"); 390 // done 391 mesh_upper_transport_process_segmented_message_done(incoming_transport_pdu_decoded); 392 } 393 } 394 } 395 396 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 397 crypto_active = 0; 398 switch (pdu->pdu_type){ 399 case MESH_PDU_TYPE_NETWORK: 400 mesh_upper_transport_process_unsegmented_message_done((mesh_network_pdu_t *) pdu); 401 break; 402 case MESH_PDU_TYPE_TRANSPORT: 403 mesh_upper_transport_process_segmented_message_done((mesh_transport_pdu_t *) pdu); 404 break; 405 case MESH_PDU_TYPE_MESSAGE: 406 mesh_upper_transport_process_message_done((mesh_message_pdu_t *) pdu); 407 break; 408 default: 409 break; 410 } 411 } 412 413 static void mesh_upper_transport_validate_segmented_message_digest(void * arg){ 414 UNUSED(arg); 415 uint8_t upper_transport_pdu_len = incoming_transport_pdu_raw->len - incoming_transport_pdu_raw->transmic_len; 416 uint8_t * upper_transport_pdu_data_in = incoming_transport_pdu_raw->data; 417 uint8_t * upper_transport_pdu_data_out = incoming_transport_pdu_decoded->data; 418 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_in, upper_transport_pdu_data_out, &mesh_upper_transport_validate_segmented_message_ccm, NULL); 419 } 420 421 static void mesh_upper_transport_validate_unsegmented_message_digest(void * arg){ 422 UNUSED(arg); 423 uint8_t trans_mic_len = 4; 424 uint8_t lower_transport_pdu_len = incoming_network_pdu_raw->len - 9; 425 uint8_t * upper_transport_pdu_data_in = &incoming_network_pdu_raw->data[10]; 426 uint8_t * upper_transport_pdu_data_out = &incoming_network_pdu_decoded->data[10]; 427 uint8_t upper_transport_pdu_len = lower_transport_pdu_len - 1 - trans_mic_len; 428 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_in, upper_transport_pdu_data_out, &mesh_upper_transport_validate_unsegmented_message_ccm, NULL); 429 } 430 431 static void mesh_upper_transport_validate_unsegmented_message(void){ 432 433 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 434 printf("No valid transport key found\n"); 435 mesh_upper_transport_process_unsegmented_message_done(incoming_network_pdu_decoded); 436 return; 437 } 438 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 439 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 440 441 if (message_key->akf){ 442 transport_unsegmented_setup_application_nonce(application_nonce, incoming_network_pdu_raw); 443 } else { 444 transport_unsegmented_setup_device_nonce(application_nonce, incoming_network_pdu_raw); 445 } 446 447 // store application / device key index 448 mesh_print_hex("AppOrDevKey", message_key->key, 16); 449 incoming_network_pdu_decoded->appkey_index = message_key->appkey_index; 450 incoming_message_pdu_singleton.appkey_index = message_key->appkey_index; 451 452 // unsegmented message have TransMIC of 32 bit 453 uint8_t trans_mic_len = 4; 454 printf("Unsegmented Access message with TransMIC len 4\n"); 455 456 uint8_t lower_transport_pdu_len = incoming_network_pdu_raw->len - 9; 457 uint8_t * upper_transport_pdu_data = &incoming_network_pdu_raw->data[10]; 458 uint8_t upper_transport_pdu_len = lower_transport_pdu_len - 1 - trans_mic_len; 459 460 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 461 462 // decrypt ccm 463 crypto_active = 1; 464 uint16_t aad_len = 0; 465 if (mesh_network_address_virtual(mesh_network_dst(incoming_network_pdu_decoded))){ 466 aad_len = 16; 467 } 468 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, trans_mic_len); 469 if (aad_len){ 470 btstack_crypto_ccm_digest(&ccm, (uint8_t*) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_unsegmented_message_digest, NULL); 471 } else { 472 mesh_upper_transport_validate_unsegmented_message_digest(incoming_network_pdu_decoded); 473 } 474 } 475 476 static void mesh_upper_transport_validate_segmented_message(void){ 477 uint8_t * upper_transport_pdu_data = incoming_transport_pdu_decoded->data; 478 uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->transmic_len; 479 480 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 481 printf("No valid transport key found\n"); 482 mesh_upper_transport_process_segmented_message_done(incoming_transport_pdu_decoded); 483 return; 484 } 485 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 486 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 487 488 if (message_key->akf){ 489 transport_segmented_setup_application_nonce(application_nonce, incoming_transport_pdu_raw); 490 } else { 491 transport_segmented_setup_device_nonce(application_nonce, incoming_transport_pdu_raw); 492 } 493 494 // store application / device key index 495 mesh_print_hex("AppOrDevKey", message_key->key, 16); 496 incoming_transport_pdu_decoded->appkey_index = message_key->appkey_index; 497 498 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 499 500 // decrypt ccm 501 crypto_active = 1; 502 uint16_t aad_len = 0; 503 if (mesh_network_address_virtual(mesh_transport_dst(incoming_transport_pdu_decoded))){ 504 aad_len = 16; 505 } 506 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, incoming_transport_pdu_decoded->transmic_len); 507 508 if (aad_len){ 509 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_segmented_message_digest, NULL); 510 } else { 511 mesh_upper_transport_validate_segmented_message_digest(NULL); 512 } 513 } 514 515 static void mesh_upper_transport_process_unsegmented_access_message(void){ 516 // copy original pdu 517 incoming_network_pdu_decoded->len = incoming_network_pdu_raw->len; 518 (void)memcpy(incoming_network_pdu_decoded->data, 519 incoming_network_pdu_raw->data, 520 incoming_network_pdu_decoded->len); 521 522 // 523 uint8_t * lower_transport_pdu = &incoming_network_pdu_raw->data[9]; 524 uint8_t lower_transport_pdu_len = incoming_network_pdu_raw->len - 9; 525 526 mesh_print_hex("Lower Transport network pdu", &incoming_network_pdu_raw->data[9], lower_transport_pdu_len); 527 528 uint8_t aid = lower_transport_pdu[0] & 0x3f; 529 uint8_t akf = (lower_transport_pdu[0] & 0x40) >> 6; 530 printf("AKF: %u\n", akf); 531 printf("AID: %02x\n", aid); 532 533 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_network_dst(incoming_network_pdu_decoded), 534 incoming_network_pdu_decoded->netkey_index, akf, aid); 535 mesh_upper_transport_validate_unsegmented_message(); 536 } 537 538 static void mesh_upper_transport_process_message(void){ 539 // copy original pdu 540 (void)memcpy(incoming_transport_pdu_decoded, incoming_transport_pdu_raw, 541 sizeof(mesh_transport_pdu_t)); 542 543 // 544 uint8_t * upper_transport_pdu = incoming_transport_pdu_decoded->data; 545 uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->transmic_len; 546 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 547 548 uint8_t aid = incoming_transport_pdu_decoded->akf_aid_control & 0x3f; 549 uint8_t akf = (incoming_transport_pdu_decoded->akf_aid_control & 0x40) >> 6; 550 551 printf("AKF: %u\n", akf); 552 printf("AID: %02x\n", aid); 553 554 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_transport_dst(incoming_transport_pdu_decoded), 555 incoming_transport_pdu_decoded->netkey_index, akf, aid); 556 mesh_upper_transport_validate_segmented_message(); 557 } 558 559 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 560 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 561 mesh_upper_transport_run(); 562 } 563 564 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 565 mesh_network_pdu_t * network_pdu; 566 mesh_transport_pdu_t * transport_pdu; 567 mesh_message_pdu_t * message_pdu; 568 switch (pdu->pdu_type) { 569 case MESH_PDU_TYPE_NETWORK: 570 network_pdu = (mesh_network_pdu_t *) pdu; 571 mesh_network_pdu_free(network_pdu); 572 break; 573 case MESH_PDU_TYPE_TRANSPORT: 574 transport_pdu = (mesh_transport_pdu_t *) pdu; 575 mesh_transport_pdu_free(transport_pdu); 576 break; 577 case MESH_PDU_TYPE_MESSAGE: 578 message_pdu = (mesh_message_pdu_t *) pdu; 579 mesh_message_pdu_free(message_pdu); 580 default: 581 break; 582 } 583 } 584 585 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 586 switch (callback_type){ 587 case MESH_TRANSPORT_PDU_RECEIVED: 588 mesh_upper_transport_message_received(pdu); 589 break; 590 case MESH_TRANSPORT_PDU_SENT: 591 // notify upper layer (or just free pdu) 592 if (higher_layer_handler){ 593 higher_layer_handler(callback_type, status, pdu); 594 } else { 595 mesh_upper_transport_pdu_free(pdu); 596 } 597 mesh_upper_transport_run(); 598 break; 599 default: 600 break; 601 } 602 } 603 static void mesh_upper_transport_send_unsegmented_access_pdu_ccm(void * arg){ 604 crypto_active = 0; 605 606 mesh_message_pdu_t * message_pdu = (mesh_message_pdu_t *) arg; 607 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 608 609 uint8_t * upper_transport_pdu = mesh_network_pdu_data(network_pdu) + 1; 610 uint8_t upper_transport_pdu_len = mesh_network_pdu_len(network_pdu) - 1; 611 mesh_print_hex("EncAccessPayload", upper_transport_pdu, upper_transport_pdu_len); 612 // store TransMIC 613 btstack_crypto_ccm_get_authentication_value(&ccm, &upper_transport_pdu[upper_transport_pdu_len]); 614 mesh_print_hex("TransMIC", &upper_transport_pdu[upper_transport_pdu_len], 4); 615 network_pdu->len += 4; 616 upper_transport_pdu_len += 4; 617 mesh_print_hex("UpperTransportPDU", upper_transport_pdu, upper_transport_pdu_len); 618 // send network pdu 619 mesh_lower_transport_send_pdu((mesh_pdu_t*) message_pdu); 620 } 621 622 static void mesh_upper_transport_send_segmented_access_pdu_ccm(void * arg){ 623 crypto_active = 0; 624 625 mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) arg; 626 mesh_print_hex("EncAccessPayload", transport_pdu->data, transport_pdu->len); 627 // store TransMIC 628 btstack_crypto_ccm_get_authentication_value(&ccm, &transport_pdu->data[transport_pdu->len]); 629 mesh_print_hex("TransMIC", &transport_pdu->data[transport_pdu->len], transport_pdu->transmic_len); 630 transport_pdu->len += transport_pdu->transmic_len; 631 mesh_print_hex("UpperTransportPDU", transport_pdu->data, transport_pdu->len); 632 mesh_lower_transport_send_pdu((mesh_pdu_t*) transport_pdu); 633 } 634 635 static uint8_t mesh_upper_transport_setup_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, 636 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 637 638 if (control_pdu_len > 11) return 1; 639 640 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 641 if (!network_key) return 1; 642 643 uint8_t transport_pdu_data[12]; 644 transport_pdu_data[0] = opcode; 645 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 646 uint16_t transport_pdu_len = control_pdu_len + 1; 647 648 // setup network_pdu 649 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 650 651 return 0; 652 } 653 654 static uint8_t mesh_upper_transport_setup_segmented_control_pdu(mesh_transport_pdu_t * transport_pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, 655 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 656 657 if (control_pdu_len > 256) return 1; 658 659 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 660 if (!network_key) return 1; 661 662 (void)memcpy(transport_pdu->data, control_pdu_data, control_pdu_len); 663 transport_pdu->len = control_pdu_len; 664 transport_pdu->netkey_index = netkey_index; 665 transport_pdu->akf_aid_control = opcode; 666 transport_pdu->transmic_len = 0; // no TransMIC for control 667 mesh_transport_set_nid_ivi(transport_pdu, network_key->nid); 668 mesh_transport_set_src(transport_pdu, src); 669 mesh_transport_set_dest(transport_pdu, dest); 670 mesh_transport_set_ctl_ttl(transport_pdu, 0x80 | ttl); 671 672 return 0; 673 } 674 675 uint8_t mesh_upper_transport_setup_control_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, 676 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 677 switch (pdu->pdu_type){ 678 case MESH_PDU_TYPE_NETWORK: 679 return mesh_upper_transport_setup_unsegmented_control_pdu((mesh_network_pdu_t *) pdu, netkey_index, ttl, src, dest, opcode, control_pdu_data, control_pdu_len); 680 case MESH_PDU_TYPE_TRANSPORT: 681 return mesh_upper_transport_setup_segmented_control_pdu((mesh_transport_pdu_t *) pdu, netkey_index, ttl, src, dest, opcode, control_pdu_data, control_pdu_len); 682 case MESH_PDU_TYPE_MESSAGE: 683 btstack_assert(0); 684 break; 685 default: 686 return 1; 687 } 688 } 689 690 static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu_header(mesh_message_pdu_t * message_pdu, uint16_t netkey_index, 691 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest){ 692 693 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 694 695 // get app or device key 696 const mesh_transport_key_t * appkey; 697 appkey = mesh_transport_key_get(appkey_index); 698 if (appkey == NULL){ 699 printf("appkey_index %x unknown\n", appkey_index); 700 return 1; 701 } 702 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 703 704 // lookup network by netkey_index 705 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 706 if (!network_key) return 1; 707 708 message_pdu->appkey_index = appkey_index; 709 710 network_pdu->data[9] = akf_aid; 711 // setup network_pdu 712 mesh_network_setup_pdu_header(network_pdu, netkey_index, network_key->nid, 0, ttl, 0, src, dest); 713 return 0; 714 } 715 716 static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu(mesh_message_pdu_t * message_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, 717 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 718 719 int status = mesh_upper_transport_setup_unsegmented_access_pdu_header(message_pdu, netkey_index, appkey_index, ttl, src, dest); 720 if (status) return status; 721 722 // store in transport pdu 723 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 724 (void)memcpy(&network_pdu->data[10], access_pdu_data, access_pdu_len); 725 network_pdu->len = 10 + access_pdu_len; 726 return 0; 727 } 728 729 static uint8_t mesh_upper_transport_setup_segmented_access_pdu_header(mesh_transport_pdu_t * transport_pdu, uint16_t netkey_index, 730 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 731 732 // get app or device key 733 const mesh_transport_key_t *appkey; 734 appkey = mesh_transport_key_get(appkey_index); 735 if (appkey == NULL) { 736 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 737 return 1; 738 } 739 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 740 741 // lookup network by netkey_index 742 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 743 if (!network_key) return 1; 744 if (network_key == NULL) { 745 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 746 return 1; 747 } 748 749 const uint8_t trans_mic_len = szmic ? 8 : 4; 750 751 // store in transport pdu 752 transport_pdu->transmic_len = trans_mic_len; 753 transport_pdu->netkey_index = netkey_index; 754 transport_pdu->appkey_index = appkey_index; 755 transport_pdu->akf_aid_control = akf_aid; 756 mesh_transport_set_nid_ivi(transport_pdu, network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7)); 757 mesh_transport_set_src(transport_pdu, src); 758 mesh_transport_set_dest(transport_pdu, dest); 759 mesh_transport_set_ctl_ttl(transport_pdu, ttl); 760 return 0; 761 } 762 763 764 static uint8_t mesh_upper_transport_setup_segmented_access_pdu(mesh_transport_pdu_t * transport_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, 765 uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 766 int status = mesh_upper_transport_setup_segmented_access_pdu_header(transport_pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 767 if (status) return status; 768 769 // store in transport pdu 770 (void)memcpy(transport_pdu->data, access_pdu_data, access_pdu_len); 771 transport_pdu->len = access_pdu_len; 772 return 0; 773 } 774 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 775 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 776 switch (pdu->pdu_type){ 777 case MESH_PDU_TYPE_NETWORK: 778 btstack_assert(0); 779 case MESH_PDU_TYPE_TRANSPORT: 780 return mesh_upper_transport_setup_segmented_access_pdu_header((mesh_transport_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 781 case MESH_PDU_TYPE_MESSAGE: 782 return mesh_upper_transport_setup_unsegmented_access_pdu_header((mesh_message_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest); 783 default: 784 return 1; 785 } 786 } 787 788 uint8_t mesh_upper_transport_setup_access_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 789 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic, 790 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 791 switch (pdu->pdu_type){ 792 case MESH_PDU_TYPE_NETWORK: 793 btstack_assert(0); 794 break; 795 case MESH_PDU_TYPE_MESSAGE: 796 return mesh_upper_transport_setup_unsegmented_access_pdu((mesh_message_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, access_pdu_data, access_pdu_len); 797 case MESH_PDU_TYPE_TRANSPORT: 798 return mesh_upper_transport_setup_segmented_access_pdu((mesh_transport_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic, access_pdu_data, access_pdu_len); 799 default: 800 return 1; 801 } 802 } 803 804 static void mesh_upper_transport_send_unsegmented_access_pdu_digest(void * arg){ 805 mesh_message_pdu_t * message_pdu = (mesh_message_pdu_t *) arg; 806 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 807 uint8_t * access_pdu_data = mesh_network_pdu_data(network_pdu) + 1; 808 uint16_t access_pdu_len = mesh_network_pdu_len(network_pdu) - 1; 809 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, access_pdu_data, access_pdu_data, &mesh_upper_transport_send_unsegmented_access_pdu_ccm, message_pdu); 810 } 811 812 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 813 // Device Key is fixed 814 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 815 return mesh_transport_key_get(appkey_index); 816 } 817 818 // Get key refresh state from subnet 819 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 820 if (subnet == NULL) return NULL; 821 822 // identify old and new app keys for given appkey_index 823 mesh_transport_key_t * old_key = NULL; 824 mesh_transport_key_t * new_key = NULL; 825 mesh_transport_key_iterator_t it; 826 mesh_transport_key_iterator_init(&it, netkey_index); 827 while (mesh_transport_key_iterator_has_more(&it)){ 828 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 829 if (transport_key->appkey_index != appkey_index) continue; 830 if (transport_key->old_key == 0) { 831 new_key = transport_key; 832 } else { 833 old_key = transport_key; 834 } 835 } 836 837 // if no key is marked as old, just use the current one 838 if (old_key == NULL) return new_key; 839 840 // use new key if it exists in phase two 841 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 842 return new_key; 843 } else { 844 return old_key; 845 } 846 } 847 848 static void mesh_upper_transport_send_unsegmented_access_pdu(mesh_message_pdu_t * message_pdu){ 849 850 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 851 852 // if dst is virtual address, lookup label uuid and hash 853 uint16_t aad_len = 0; 854 mesh_virtual_address_t * virtual_address = NULL; 855 uint16_t dst = mesh_network_dst(network_pdu); 856 if (mesh_network_address_virtual(dst)){ 857 virtual_address = mesh_virtual_address_for_pseudo_dst(dst); 858 if (!virtual_address){ 859 printf("No virtual address register for pseudo dst %4x\n", dst); 860 btstack_memory_mesh_network_pdu_free(network_pdu); 861 return; 862 } 863 aad_len = 16; 864 big_endian_store_16(network_pdu->data, 7, virtual_address->hash); 865 } 866 867 // reserve slot 868 mesh_lower_transport_reserve_slot(); 869 870 // Nonce for Access Payload based on Network Sequence number: needs to be fixed now and lower layers need to send packet in right order 871 uint32_t seq = mesh_sequence_number_next(); 872 mesh_network_pdu_set_seq(network_pdu, seq); 873 874 // Dump PDU 875 printf("[+] Upper transport, send unsegmented Access PDU - dest %04x, seq %06x\n", dst, mesh_network_seq(network_pdu)); 876 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 877 878 // setup nonce 879 uint16_t appkey_index = message_pdu->appkey_index; 880 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 881 transport_unsegmented_setup_device_nonce(application_nonce, network_pdu); 882 } else { 883 transport_unsegmented_setup_application_nonce(application_nonce, network_pdu); 884 } 885 886 // get app or device key 887 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(network_pdu->netkey_index, appkey_index); 888 mesh_print_hex("AppOrDevKey", appkey->key, 16); 889 890 // encrypt ccm 891 uint8_t trans_mic_len = 4; 892 uint16_t access_pdu_len = mesh_network_pdu_len(network_pdu) - 1; 893 crypto_active = 1; 894 895 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, trans_mic_len); 896 if (virtual_address){ 897 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 898 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, &mesh_upper_transport_send_unsegmented_access_pdu_digest, message_pdu); 899 } else { 900 mesh_upper_transport_send_unsegmented_access_pdu_digest(message_pdu); 901 } 902 } 903 904 static void mesh_upper_transport_send_segmented_access_pdu_digest(void *arg){ 905 mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) arg; 906 uint16_t access_pdu_len = transport_pdu->len; 907 uint8_t * access_pdu_data = transport_pdu->data; 908 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len,access_pdu_data, access_pdu_data, &mesh_upper_transport_send_segmented_access_pdu_ccm, transport_pdu); 909 } 910 911 static void mesh_upper_transport_send_segmented_access_pdu(mesh_transport_pdu_t * transport_pdu){ 912 913 // if dst is virtual address, lookup label uuid and hash 914 uint16_t aad_len = 0; 915 mesh_virtual_address_t * virtual_address = NULL; 916 uint16_t dst = mesh_transport_dst(transport_pdu); 917 if (mesh_network_address_virtual(dst)){ 918 virtual_address = mesh_virtual_address_for_pseudo_dst(dst); 919 if (!virtual_address){ 920 printf("No virtual address register for pseudo dst %4x\n", dst); 921 btstack_memory_mesh_transport_pdu_free(transport_pdu); 922 return; 923 } 924 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 925 // printf_hexdump(virtual_address->label_uuid, 16); 926 aad_len = 16; 927 big_endian_store_16(transport_pdu->network_header, 7, virtual_address->hash); 928 } 929 930 // get app or device key 931 uint16_t appkey_index = transport_pdu->appkey_index; 932 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(transport_pdu->netkey_index, appkey_index); 933 if (appkey == NULL){ 934 printf("AppKey %04x not found, drop message\n", appkey_index); 935 btstack_memory_mesh_transport_pdu_free(transport_pdu); 936 return; 937 } 938 939 // reserve slot 940 mesh_lower_transport_reserve_slot(); 941 942 // reserve one sequence number, which is also used to encrypt access payload 943 uint32_t seq = mesh_sequence_number_next(); 944 transport_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 945 mesh_transport_set_seq(transport_pdu, seq); 946 947 // Dump PDU 948 printf("[+] Upper transport, send segmented Access PDU - dest %04x, seq %06x\n", dst, mesh_transport_seq(transport_pdu)); 949 mesh_print_hex("Access Payload", transport_pdu->data, transport_pdu->len); 950 951 // setup nonce - uses dst, so after pseudo address translation 952 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 953 transport_segmented_setup_device_nonce(application_nonce, transport_pdu); 954 } else { 955 transport_segmented_setup_application_nonce(application_nonce, transport_pdu); 956 } 957 958 // Dump key 959 mesh_print_hex("AppOrDevKey", appkey->key, 16); 960 961 // encrypt ccm 962 uint8_t transmic_len = transport_pdu->transmic_len; 963 uint16_t access_pdu_len = transport_pdu->len; 964 crypto_active = 1; 965 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 966 if (virtual_address){ 967 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 968 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, &mesh_upper_transport_send_segmented_access_pdu_digest, transport_pdu); 969 } else { 970 mesh_upper_transport_send_segmented_access_pdu_digest(transport_pdu); 971 } 972 } 973 974 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 975 // reserve slot 976 mesh_lower_transport_reserve_slot(); 977 // reserve sequence number 978 uint32_t seq = mesh_sequence_number_next(); 979 mesh_network_pdu_set_seq(network_pdu, seq); 980 // Dump PDU 981 uint8_t opcode = network_pdu->data[9]; 982 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 983 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 984 // send 985 mesh_lower_transport_send_pdu((mesh_pdu_t *) network_pdu); 986 } 987 988 static void mesh_upper_transport_send_segmented_control_pdu(mesh_transport_pdu_t * transport_pdu){ 989 // reserve slot 990 mesh_lower_transport_reserve_slot(); 991 // reserve sequence number 992 uint32_t seq = mesh_sequence_number_next(); 993 transport_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 994 mesh_transport_set_seq(transport_pdu, seq); 995 // Dump PDU 996 uint8_t opcode = transport_pdu->data[0]; 997 printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", transport_pdu, seq, opcode); 998 mesh_print_hex("Access Payload", &transport_pdu->data[1], transport_pdu->len - 1); 999 // send 1000 mesh_lower_transport_send_pdu((mesh_pdu_t *) transport_pdu); 1001 } 1002 1003 static void mesh_upper_transport_run(void){ 1004 1005 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 1006 1007 if (crypto_active) return; 1008 1009 // peek at next message 1010 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_incoming); 1011 mesh_network_pdu_t * network_pdu; 1012 mesh_transport_pdu_t * transport_pdu; 1013 mesh_message_pdu_t * message_pdu; 1014 switch (pdu->pdu_type){ 1015 case MESH_PDU_TYPE_NETWORK: 1016 network_pdu = (mesh_network_pdu_t *) pdu; 1017 // control? 1018 if (mesh_network_control(network_pdu)) { 1019 (void) btstack_linked_list_pop(&upper_transport_incoming); 1020 mesh_upper_unsegmented_control_message_received(network_pdu); 1021 } else { 1022 incoming_network_pdu_decoded = mesh_network_pdu_get(); 1023 if (!incoming_network_pdu_decoded) return; 1024 1025 (void) btstack_linked_list_pop(&upper_transport_incoming); 1026 incoming_network_pdu_raw = network_pdu; 1027 1028 // use pre-allocated message pdu 1029 incoming_message_pdu_singleton.pdu_header.pdu_type = MESH_PDU_TYPE_MESSAGE; 1030 btstack_linked_list_add(&incoming_message_pdu_singleton.segments, (btstack_linked_item_t *) incoming_network_pdu_decoded); 1031 mesh_upper_transport_process_unsegmented_access_message(); 1032 } 1033 break; 1034 case MESH_PDU_TYPE_MESSAGE: 1035 message_pdu = (mesh_message_pdu_t *) pdu; 1036 uint8_t ctl = mesh_message_ctl(message_pdu); 1037 if (ctl){ 1038 printf("Ignoring Segmented Control Message\n"); 1039 (void) btstack_linked_list_pop(&upper_transport_incoming); 1040 mesh_lower_transport_message_processed_by_higher_layer(pdu); 1041 } else { 1042 incoming_transport_pdu_decoded = mesh_transport_pdu_get(); 1043 if (!incoming_transport_pdu_decoded) return; 1044 1045 // use pre-allocated transport buffer 1046 transport_pdu = &incoming_transport_pdu_singleton; 1047 incoming_transport_pdu_singleton.pdu_header.pdu_type = MESH_PDU_TYPE_TRANSPORT; 1048 1049 // flatten segmented message into mesh_transport_pdu_t 1050 1051 // assemble payload 1052 while (message_pdu->segments){ 1053 mesh_network_pdu_t * segment = (mesh_network_pdu_t *) btstack_linked_list_pop(&message_pdu->segments); 1054 // get segment n 1055 uint8_t * lower_transport_pdu = mesh_network_pdu_data(segment); 1056 uint8_t seg_o = ( big_endian_read_16(lower_transport_pdu, 2) >> 5) & 0x001f; 1057 uint8_t * segment_data = &lower_transport_pdu[4]; 1058 (void)memcpy(&transport_pdu->data[seg_o * 12], segment_data, 12); 1059 } 1060 1061 // copy meta data 1062 transport_pdu->len = message_pdu->len; 1063 transport_pdu->netkey_index = message_pdu->netkey_index; 1064 transport_pdu->transmic_len = message_pdu->transmic_len; 1065 transport_pdu->akf_aid_control = message_pdu->akf_aid_control; 1066 transport_pdu->flags = message_pdu->flags; 1067 transport_pdu->message_complete = message_pdu->message_complete; 1068 transport_pdu->seq_zero = message_pdu->seq_zero; 1069 (void)memcpy(transport_pdu->network_header, message_pdu->network_header, 9); 1070 1071 mesh_print_hex("Assembled payload", transport_pdu->data, transport_pdu->len); 1072 1073 // free mesh message 1074 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 1075 1076 // get encoded transport pdu and start processing 1077 incoming_transport_pdu_raw = transport_pdu; 1078 (void) btstack_linked_list_pop(&upper_transport_incoming); 1079 mesh_upper_transport_process_message(); 1080 } 1081 break; 1082 default: 1083 break; 1084 } 1085 } 1086 1087 while (!btstack_linked_list_empty(&upper_transport_outgoing)){ 1088 1089 if (crypto_active) break; 1090 1091 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_outgoing); 1092 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == 0) break; 1093 1094 (void) btstack_linked_list_pop(&upper_transport_outgoing); 1095 1096 if (mesh_pdu_ctl(pdu)){ 1097 switch (pdu->pdu_type){ 1098 case MESH_PDU_TYPE_NETWORK: 1099 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 1100 break; 1101 case MESH_PDU_TYPE_MESSAGE: 1102 btstack_assert(0); 1103 break; 1104 case MESH_PDU_TYPE_TRANSPORT: 1105 mesh_upper_transport_send_segmented_control_pdu((mesh_transport_pdu_t *) pdu); 1106 break; 1107 default: 1108 break; 1109 } 1110 } else { 1111 switch (pdu->pdu_type){ 1112 case MESH_PDU_TYPE_NETWORK: 1113 btstack_assert(0); 1114 break; 1115 case MESH_PDU_TYPE_MESSAGE: 1116 mesh_upper_transport_send_unsegmented_access_pdu((mesh_message_pdu_t *) pdu); 1117 break; 1118 case MESH_PDU_TYPE_TRANSPORT: 1119 mesh_upper_transport_send_segmented_access_pdu((mesh_transport_pdu_t *) pdu); 1120 break; 1121 default: 1122 break; 1123 } 1124 } 1125 } 1126 } 1127 1128 void mesh_upper_transport_register_access_message_handler(void (*callback)(mesh_pdu_t *pdu)){ 1129 mesh_access_message_handler = callback; 1130 } 1131 1132 void mesh_upper_transport_register_control_message_handler(void (*callback)(mesh_pdu_t *pdu)){ 1133 mesh_control_message_handler = callback; 1134 } 1135 1136 void mesh_upper_transport_set_higher_layer_handler(void (*pdu_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu)){ 1137 higher_layer_handler = pdu_handler; 1138 } 1139 1140 void mesh_upper_transport_init(){ 1141 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1142 } 1143 1144 // TODO: higher layer define used for assert 1145 #define MESH_ACCESS_OPCODE_NOT_SET 0xFFFFFFFEu 1146 1147 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 1148 btstack_assert(pdu->pdu_type != MESH_PDU_TYPE_NETWORK); 1149 1150 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1151 mesh_upper_transport_run(); 1152 } 1153 1154 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 1155 if (pdu->pdu_type == MESH_PDU_TYPE_NETWORK){ 1156 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 1157 } 1158 1159 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1160 mesh_upper_transport_run(); 1161 } 1162