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_message_pdu_singleton.appkey_index = message_key->appkey_index; 450 451 // unsegmented message have TransMIC of 32 bit 452 uint8_t trans_mic_len = 4; 453 printf("Unsegmented Access message with TransMIC len 4\n"); 454 455 uint8_t lower_transport_pdu_len = incoming_network_pdu_raw->len - 9; 456 uint8_t * upper_transport_pdu_data = &incoming_network_pdu_raw->data[10]; 457 uint8_t upper_transport_pdu_len = lower_transport_pdu_len - 1 - trans_mic_len; 458 459 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 460 461 // decrypt ccm 462 crypto_active = 1; 463 uint16_t aad_len = 0; 464 if (mesh_network_address_virtual(mesh_network_dst(incoming_network_pdu_decoded))){ 465 aad_len = 16; 466 } 467 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, trans_mic_len); 468 if (aad_len){ 469 btstack_crypto_ccm_digest(&ccm, (uint8_t*) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_unsegmented_message_digest, NULL); 470 } else { 471 mesh_upper_transport_validate_unsegmented_message_digest(incoming_network_pdu_decoded); 472 } 473 } 474 475 static void mesh_upper_transport_validate_segmented_message(void){ 476 uint8_t * upper_transport_pdu_data = incoming_transport_pdu_decoded->data; 477 uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->transmic_len; 478 479 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 480 printf("No valid transport key found\n"); 481 mesh_upper_transport_process_segmented_message_done(incoming_transport_pdu_decoded); 482 return; 483 } 484 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 485 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 486 487 if (message_key->akf){ 488 transport_segmented_setup_application_nonce(application_nonce, incoming_transport_pdu_raw); 489 } else { 490 transport_segmented_setup_device_nonce(application_nonce, incoming_transport_pdu_raw); 491 } 492 493 // store application / device key index 494 mesh_print_hex("AppOrDevKey", message_key->key, 16); 495 incoming_transport_pdu_decoded->appkey_index = message_key->appkey_index; 496 497 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 498 499 // decrypt ccm 500 crypto_active = 1; 501 uint16_t aad_len = 0; 502 if (mesh_network_address_virtual(mesh_transport_dst(incoming_transport_pdu_decoded))){ 503 aad_len = 16; 504 } 505 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, incoming_transport_pdu_decoded->transmic_len); 506 507 if (aad_len){ 508 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_segmented_message_digest, NULL); 509 } else { 510 mesh_upper_transport_validate_segmented_message_digest(NULL); 511 } 512 } 513 514 static void mesh_upper_transport_process_unsegmented_access_message(void){ 515 // copy original pdu 516 incoming_network_pdu_decoded->len = incoming_network_pdu_raw->len; 517 (void)memcpy(incoming_network_pdu_decoded->data, 518 incoming_network_pdu_raw->data, 519 incoming_network_pdu_decoded->len); 520 521 // 522 uint8_t * lower_transport_pdu = &incoming_network_pdu_raw->data[9]; 523 uint8_t lower_transport_pdu_len = incoming_network_pdu_raw->len - 9; 524 525 mesh_print_hex("Lower Transport network pdu", &incoming_network_pdu_raw->data[9], lower_transport_pdu_len); 526 527 uint8_t aid = lower_transport_pdu[0] & 0x3f; 528 uint8_t akf = (lower_transport_pdu[0] & 0x40) >> 6; 529 printf("AKF: %u\n", akf); 530 printf("AID: %02x\n", aid); 531 532 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_network_dst(incoming_network_pdu_decoded), 533 incoming_network_pdu_decoded->netkey_index, akf, aid); 534 mesh_upper_transport_validate_unsegmented_message(); 535 } 536 537 static void mesh_upper_transport_process_message(void){ 538 // copy original pdu 539 (void)memcpy(incoming_transport_pdu_decoded, incoming_transport_pdu_raw, 540 sizeof(mesh_transport_pdu_t)); 541 542 // 543 uint8_t * upper_transport_pdu = incoming_transport_pdu_decoded->data; 544 uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->transmic_len; 545 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 546 547 uint8_t aid = incoming_transport_pdu_decoded->akf_aid_control & 0x3f; 548 uint8_t akf = (incoming_transport_pdu_decoded->akf_aid_control & 0x40) >> 6; 549 550 printf("AKF: %u\n", akf); 551 printf("AID: %02x\n", aid); 552 553 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_transport_dst(incoming_transport_pdu_decoded), 554 incoming_transport_pdu_decoded->netkey_index, akf, aid); 555 mesh_upper_transport_validate_segmented_message(); 556 } 557 558 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 559 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 560 mesh_upper_transport_run(); 561 } 562 563 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 564 mesh_network_pdu_t * network_pdu; 565 mesh_transport_pdu_t * transport_pdu; 566 mesh_message_pdu_t * message_pdu; 567 switch (pdu->pdu_type) { 568 case MESH_PDU_TYPE_NETWORK: 569 network_pdu = (mesh_network_pdu_t *) pdu; 570 mesh_network_pdu_free(network_pdu); 571 break; 572 case MESH_PDU_TYPE_TRANSPORT: 573 transport_pdu = (mesh_transport_pdu_t *) pdu; 574 mesh_transport_pdu_free(transport_pdu); 575 break; 576 case MESH_PDU_TYPE_MESSAGE: 577 message_pdu = (mesh_message_pdu_t *) pdu; 578 mesh_message_pdu_free(message_pdu); 579 default: 580 break; 581 } 582 } 583 584 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 585 switch (callback_type){ 586 case MESH_TRANSPORT_PDU_RECEIVED: 587 mesh_upper_transport_message_received(pdu); 588 break; 589 case MESH_TRANSPORT_PDU_SENT: 590 // notify upper layer (or just free pdu) 591 if (higher_layer_handler){ 592 higher_layer_handler(callback_type, status, pdu); 593 } else { 594 mesh_upper_transport_pdu_free(pdu); 595 } 596 mesh_upper_transport_run(); 597 break; 598 default: 599 break; 600 } 601 } 602 static void mesh_upper_transport_send_unsegmented_access_pdu_ccm(void * arg){ 603 crypto_active = 0; 604 605 mesh_message_pdu_t * message_pdu = (mesh_message_pdu_t *) arg; 606 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 607 608 uint8_t * upper_transport_pdu = mesh_network_pdu_data(network_pdu) + 1; 609 uint8_t upper_transport_pdu_len = mesh_network_pdu_len(network_pdu) - 1; 610 mesh_print_hex("EncAccessPayload", upper_transport_pdu, upper_transport_pdu_len); 611 // store TransMIC 612 btstack_crypto_ccm_get_authentication_value(&ccm, &upper_transport_pdu[upper_transport_pdu_len]); 613 mesh_print_hex("TransMIC", &upper_transport_pdu[upper_transport_pdu_len], 4); 614 network_pdu->len += 4; 615 upper_transport_pdu_len += 4; 616 mesh_print_hex("UpperTransportPDU", upper_transport_pdu, upper_transport_pdu_len); 617 // send network pdu 618 mesh_lower_transport_send_pdu((mesh_pdu_t*) message_pdu); 619 } 620 621 static void mesh_upper_transport_send_segmented_access_pdu_ccm(void * arg){ 622 crypto_active = 0; 623 624 mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) arg; 625 mesh_print_hex("EncAccessPayload", transport_pdu->data, transport_pdu->len); 626 // store TransMIC 627 btstack_crypto_ccm_get_authentication_value(&ccm, &transport_pdu->data[transport_pdu->len]); 628 mesh_print_hex("TransMIC", &transport_pdu->data[transport_pdu->len], transport_pdu->transmic_len); 629 transport_pdu->len += transport_pdu->transmic_len; 630 mesh_print_hex("UpperTransportPDU", transport_pdu->data, transport_pdu->len); 631 mesh_lower_transport_send_pdu((mesh_pdu_t*) transport_pdu); 632 } 633 634 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, 635 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 636 637 if (control_pdu_len > 11) return 1; 638 639 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 640 if (!network_key) return 1; 641 642 uint8_t transport_pdu_data[12]; 643 transport_pdu_data[0] = opcode; 644 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 645 uint16_t transport_pdu_len = control_pdu_len + 1; 646 647 // setup network_pdu 648 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 649 650 return 0; 651 } 652 653 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, 654 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 655 656 if (control_pdu_len > 256) return 1; 657 658 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 659 if (!network_key) return 1; 660 661 (void)memcpy(transport_pdu->data, control_pdu_data, control_pdu_len); 662 transport_pdu->len = control_pdu_len; 663 transport_pdu->netkey_index = netkey_index; 664 transport_pdu->akf_aid_control = opcode; 665 transport_pdu->transmic_len = 0; // no TransMIC for control 666 mesh_transport_set_nid_ivi(transport_pdu, network_key->nid); 667 mesh_transport_set_src(transport_pdu, src); 668 mesh_transport_set_dest(transport_pdu, dest); 669 mesh_transport_set_ctl_ttl(transport_pdu, 0x80 | ttl); 670 671 return 0; 672 } 673 674 uint8_t mesh_upper_transport_setup_control_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, 675 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 676 switch (pdu->pdu_type){ 677 case MESH_PDU_TYPE_NETWORK: 678 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); 679 case MESH_PDU_TYPE_TRANSPORT: 680 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); 681 case MESH_PDU_TYPE_MESSAGE: 682 btstack_assert(0); 683 break; 684 default: 685 return 1; 686 } 687 } 688 689 static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu_header(mesh_message_pdu_t * message_pdu, uint16_t netkey_index, 690 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest){ 691 692 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 693 694 // get app or device key 695 const mesh_transport_key_t * appkey; 696 appkey = mesh_transport_key_get(appkey_index); 697 if (appkey == NULL){ 698 printf("appkey_index %x unknown\n", appkey_index); 699 return 1; 700 } 701 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 702 703 // lookup network by netkey_index 704 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 705 if (!network_key) return 1; 706 707 message_pdu->appkey_index = appkey_index; 708 709 network_pdu->data[9] = akf_aid; 710 // setup network_pdu 711 mesh_network_setup_pdu_header(network_pdu, netkey_index, network_key->nid, 0, ttl, 0, src, dest); 712 return 0; 713 } 714 715 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, 716 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 717 718 int status = mesh_upper_transport_setup_unsegmented_access_pdu_header(message_pdu, netkey_index, appkey_index, ttl, src, dest); 719 if (status) return status; 720 721 // store in transport pdu 722 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 723 (void)memcpy(&network_pdu->data[10], access_pdu_data, access_pdu_len); 724 network_pdu->len = 10 + access_pdu_len; 725 return 0; 726 } 727 728 static uint8_t mesh_upper_transport_setup_segmented_access_pdu_header(mesh_transport_pdu_t * transport_pdu, uint16_t netkey_index, 729 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 730 731 // get app or device key 732 const mesh_transport_key_t *appkey; 733 appkey = mesh_transport_key_get(appkey_index); 734 if (appkey == NULL) { 735 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 736 return 1; 737 } 738 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 739 740 // lookup network by netkey_index 741 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 742 if (!network_key) return 1; 743 if (network_key == NULL) { 744 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 745 return 1; 746 } 747 748 const uint8_t trans_mic_len = szmic ? 8 : 4; 749 750 // store in transport pdu 751 transport_pdu->transmic_len = trans_mic_len; 752 transport_pdu->netkey_index = netkey_index; 753 transport_pdu->appkey_index = appkey_index; 754 transport_pdu->akf_aid_control = akf_aid; 755 mesh_transport_set_nid_ivi(transport_pdu, network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7)); 756 mesh_transport_set_src(transport_pdu, src); 757 mesh_transport_set_dest(transport_pdu, dest); 758 mesh_transport_set_ctl_ttl(transport_pdu, ttl); 759 return 0; 760 } 761 762 763 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, 764 uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 765 int status = mesh_upper_transport_setup_segmented_access_pdu_header(transport_pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 766 if (status) return status; 767 768 // store in transport pdu 769 (void)memcpy(transport_pdu->data, access_pdu_data, access_pdu_len); 770 transport_pdu->len = access_pdu_len; 771 return 0; 772 } 773 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 774 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 775 switch (pdu->pdu_type){ 776 case MESH_PDU_TYPE_NETWORK: 777 btstack_assert(0); 778 case MESH_PDU_TYPE_TRANSPORT: 779 return mesh_upper_transport_setup_segmented_access_pdu_header((mesh_transport_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 780 case MESH_PDU_TYPE_MESSAGE: 781 return mesh_upper_transport_setup_unsegmented_access_pdu_header((mesh_message_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest); 782 default: 783 return 1; 784 } 785 } 786 787 uint8_t mesh_upper_transport_setup_access_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 788 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic, 789 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 790 switch (pdu->pdu_type){ 791 case MESH_PDU_TYPE_NETWORK: 792 btstack_assert(0); 793 break; 794 case MESH_PDU_TYPE_MESSAGE: 795 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); 796 case MESH_PDU_TYPE_TRANSPORT: 797 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); 798 default: 799 return 1; 800 } 801 } 802 803 static void mesh_upper_transport_send_unsegmented_access_pdu_digest(void * arg){ 804 mesh_message_pdu_t * message_pdu = (mesh_message_pdu_t *) arg; 805 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 806 uint8_t * access_pdu_data = mesh_network_pdu_data(network_pdu) + 1; 807 uint16_t access_pdu_len = mesh_network_pdu_len(network_pdu) - 1; 808 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); 809 } 810 811 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 812 // Device Key is fixed 813 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 814 return mesh_transport_key_get(appkey_index); 815 } 816 817 // Get key refresh state from subnet 818 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 819 if (subnet == NULL) return NULL; 820 821 // identify old and new app keys for given appkey_index 822 mesh_transport_key_t * old_key = NULL; 823 mesh_transport_key_t * new_key = NULL; 824 mesh_transport_key_iterator_t it; 825 mesh_transport_key_iterator_init(&it, netkey_index); 826 while (mesh_transport_key_iterator_has_more(&it)){ 827 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 828 if (transport_key->appkey_index != appkey_index) continue; 829 if (transport_key->old_key == 0) { 830 new_key = transport_key; 831 } else { 832 old_key = transport_key; 833 } 834 } 835 836 // if no key is marked as old, just use the current one 837 if (old_key == NULL) return new_key; 838 839 // use new key if it exists in phase two 840 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 841 return new_key; 842 } else { 843 return old_key; 844 } 845 } 846 847 static void mesh_upper_transport_send_unsegmented_access_pdu(mesh_message_pdu_t * message_pdu){ 848 849 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 850 851 // if dst is virtual address, lookup label uuid and hash 852 uint16_t aad_len = 0; 853 mesh_virtual_address_t * virtual_address = NULL; 854 uint16_t dst = mesh_network_dst(network_pdu); 855 if (mesh_network_address_virtual(dst)){ 856 virtual_address = mesh_virtual_address_for_pseudo_dst(dst); 857 if (!virtual_address){ 858 printf("No virtual address register for pseudo dst %4x\n", dst); 859 btstack_memory_mesh_network_pdu_free(network_pdu); 860 return; 861 } 862 aad_len = 16; 863 big_endian_store_16(network_pdu->data, 7, virtual_address->hash); 864 } 865 866 // reserve slot 867 mesh_lower_transport_reserve_slot(); 868 869 // Nonce for Access Payload based on Network Sequence number: needs to be fixed now and lower layers need to send packet in right order 870 uint32_t seq = mesh_sequence_number_next(); 871 mesh_network_pdu_set_seq(network_pdu, seq); 872 873 // Dump PDU 874 printf("[+] Upper transport, send unsegmented Access PDU - dest %04x, seq %06x\n", dst, mesh_network_seq(network_pdu)); 875 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 876 877 // setup nonce 878 uint16_t appkey_index = message_pdu->appkey_index; 879 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 880 transport_unsegmented_setup_device_nonce(application_nonce, network_pdu); 881 } else { 882 transport_unsegmented_setup_application_nonce(application_nonce, network_pdu); 883 } 884 885 // get app or device key 886 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(network_pdu->netkey_index, appkey_index); 887 mesh_print_hex("AppOrDevKey", appkey->key, 16); 888 889 // encrypt ccm 890 uint8_t trans_mic_len = 4; 891 uint16_t access_pdu_len = mesh_network_pdu_len(network_pdu) - 1; 892 crypto_active = 1; 893 894 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, trans_mic_len); 895 if (virtual_address){ 896 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 897 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, &mesh_upper_transport_send_unsegmented_access_pdu_digest, message_pdu); 898 } else { 899 mesh_upper_transport_send_unsegmented_access_pdu_digest(message_pdu); 900 } 901 } 902 903 static void mesh_upper_transport_send_segmented_access_pdu_digest(void *arg){ 904 mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) arg; 905 uint16_t access_pdu_len = transport_pdu->len; 906 uint8_t * access_pdu_data = transport_pdu->data; 907 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); 908 } 909 910 static void mesh_upper_transport_send_segmented_access_pdu(mesh_transport_pdu_t * transport_pdu){ 911 912 // if dst is virtual address, lookup label uuid and hash 913 uint16_t aad_len = 0; 914 mesh_virtual_address_t * virtual_address = NULL; 915 uint16_t dst = mesh_transport_dst(transport_pdu); 916 if (mesh_network_address_virtual(dst)){ 917 virtual_address = mesh_virtual_address_for_pseudo_dst(dst); 918 if (!virtual_address){ 919 printf("No virtual address register for pseudo dst %4x\n", dst); 920 btstack_memory_mesh_transport_pdu_free(transport_pdu); 921 return; 922 } 923 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 924 // printf_hexdump(virtual_address->label_uuid, 16); 925 aad_len = 16; 926 big_endian_store_16(transport_pdu->network_header, 7, virtual_address->hash); 927 } 928 929 // get app or device key 930 uint16_t appkey_index = transport_pdu->appkey_index; 931 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(transport_pdu->netkey_index, appkey_index); 932 if (appkey == NULL){ 933 printf("AppKey %04x not found, drop message\n", appkey_index); 934 btstack_memory_mesh_transport_pdu_free(transport_pdu); 935 return; 936 } 937 938 // reserve slot 939 mesh_lower_transport_reserve_slot(); 940 941 // reserve one sequence number, which is also used to encrypt access payload 942 uint32_t seq = mesh_sequence_number_next(); 943 transport_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 944 mesh_transport_set_seq(transport_pdu, seq); 945 946 // Dump PDU 947 printf("[+] Upper transport, send segmented Access PDU - dest %04x, seq %06x\n", dst, mesh_transport_seq(transport_pdu)); 948 mesh_print_hex("Access Payload", transport_pdu->data, transport_pdu->len); 949 950 // setup nonce - uses dst, so after pseudo address translation 951 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 952 transport_segmented_setup_device_nonce(application_nonce, transport_pdu); 953 } else { 954 transport_segmented_setup_application_nonce(application_nonce, transport_pdu); 955 } 956 957 // Dump key 958 mesh_print_hex("AppOrDevKey", appkey->key, 16); 959 960 // encrypt ccm 961 uint8_t transmic_len = transport_pdu->transmic_len; 962 uint16_t access_pdu_len = transport_pdu->len; 963 crypto_active = 1; 964 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 965 if (virtual_address){ 966 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 967 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, &mesh_upper_transport_send_segmented_access_pdu_digest, transport_pdu); 968 } else { 969 mesh_upper_transport_send_segmented_access_pdu_digest(transport_pdu); 970 } 971 } 972 973 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 974 // reserve slot 975 mesh_lower_transport_reserve_slot(); 976 // reserve sequence number 977 uint32_t seq = mesh_sequence_number_next(); 978 mesh_network_pdu_set_seq(network_pdu, seq); 979 // Dump PDU 980 uint8_t opcode = network_pdu->data[9]; 981 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 982 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 983 // send 984 mesh_lower_transport_send_pdu((mesh_pdu_t *) network_pdu); 985 } 986 987 static void mesh_upper_transport_send_segmented_control_pdu(mesh_transport_pdu_t * transport_pdu){ 988 // reserve slot 989 mesh_lower_transport_reserve_slot(); 990 // reserve sequence number 991 uint32_t seq = mesh_sequence_number_next(); 992 transport_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 993 mesh_transport_set_seq(transport_pdu, seq); 994 // Dump PDU 995 uint8_t opcode = transport_pdu->data[0]; 996 printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", transport_pdu, seq, opcode); 997 mesh_print_hex("Access Payload", &transport_pdu->data[1], transport_pdu->len - 1); 998 // send 999 mesh_lower_transport_send_pdu((mesh_pdu_t *) transport_pdu); 1000 } 1001 1002 static void mesh_upper_transport_run(void){ 1003 1004 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 1005 1006 if (crypto_active) return; 1007 1008 // peek at next message 1009 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_incoming); 1010 mesh_network_pdu_t * network_pdu; 1011 mesh_transport_pdu_t * transport_pdu; 1012 mesh_message_pdu_t * message_pdu; 1013 switch (pdu->pdu_type){ 1014 case MESH_PDU_TYPE_NETWORK: 1015 network_pdu = (mesh_network_pdu_t *) pdu; 1016 // control? 1017 if (mesh_network_control(network_pdu)) { 1018 (void) btstack_linked_list_pop(&upper_transport_incoming); 1019 mesh_upper_unsegmented_control_message_received(network_pdu); 1020 } else { 1021 incoming_network_pdu_decoded = mesh_network_pdu_get(); 1022 if (!incoming_network_pdu_decoded) return; 1023 1024 (void) btstack_linked_list_pop(&upper_transport_incoming); 1025 incoming_network_pdu_raw = network_pdu; 1026 1027 // use pre-allocated message pdu 1028 incoming_message_pdu_singleton.pdu_header.pdu_type = MESH_PDU_TYPE_MESSAGE; 1029 btstack_linked_list_add(&incoming_message_pdu_singleton.segments, (btstack_linked_item_t *) incoming_network_pdu_decoded); 1030 mesh_upper_transport_process_unsegmented_access_message(); 1031 } 1032 break; 1033 case MESH_PDU_TYPE_MESSAGE: 1034 message_pdu = (mesh_message_pdu_t *) pdu; 1035 uint8_t ctl = mesh_message_ctl(message_pdu); 1036 if (ctl){ 1037 printf("Ignoring Segmented Control Message\n"); 1038 (void) btstack_linked_list_pop(&upper_transport_incoming); 1039 mesh_lower_transport_message_processed_by_higher_layer(pdu); 1040 } else { 1041 incoming_transport_pdu_decoded = mesh_transport_pdu_get(); 1042 if (!incoming_transport_pdu_decoded) return; 1043 1044 // use pre-allocated transport buffer 1045 transport_pdu = &incoming_transport_pdu_singleton; 1046 incoming_transport_pdu_singleton.pdu_header.pdu_type = MESH_PDU_TYPE_TRANSPORT; 1047 1048 // flatten segmented message into mesh_transport_pdu_t 1049 1050 // assemble payload 1051 while (message_pdu->segments){ 1052 mesh_network_pdu_t * segment = (mesh_network_pdu_t *) btstack_linked_list_pop(&message_pdu->segments); 1053 // get segment n 1054 uint8_t * lower_transport_pdu = mesh_network_pdu_data(segment); 1055 uint8_t seg_o = ( big_endian_read_16(lower_transport_pdu, 2) >> 5) & 0x001f; 1056 uint8_t * segment_data = &lower_transport_pdu[4]; 1057 (void)memcpy(&transport_pdu->data[seg_o * 12], segment_data, 12); 1058 } 1059 1060 // copy meta data 1061 transport_pdu->len = message_pdu->len; 1062 transport_pdu->netkey_index = message_pdu->netkey_index; 1063 transport_pdu->transmic_len = message_pdu->transmic_len; 1064 transport_pdu->akf_aid_control = message_pdu->akf_aid_control; 1065 transport_pdu->flags = message_pdu->flags; 1066 transport_pdu->message_complete = message_pdu->message_complete; 1067 transport_pdu->seq_zero = message_pdu->seq_zero; 1068 (void)memcpy(transport_pdu->network_header, message_pdu->network_header, 9); 1069 1070 mesh_print_hex("Assembled payload", transport_pdu->data, transport_pdu->len); 1071 1072 // free mesh message 1073 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 1074 1075 // get encoded transport pdu and start processing 1076 incoming_transport_pdu_raw = transport_pdu; 1077 (void) btstack_linked_list_pop(&upper_transport_incoming); 1078 mesh_upper_transport_process_message(); 1079 } 1080 break; 1081 default: 1082 break; 1083 } 1084 } 1085 1086 while (!btstack_linked_list_empty(&upper_transport_outgoing)){ 1087 1088 if (crypto_active) break; 1089 1090 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_outgoing); 1091 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == 0) break; 1092 1093 (void) btstack_linked_list_pop(&upper_transport_outgoing); 1094 1095 if (mesh_pdu_ctl(pdu)){ 1096 switch (pdu->pdu_type){ 1097 case MESH_PDU_TYPE_NETWORK: 1098 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 1099 break; 1100 case MESH_PDU_TYPE_MESSAGE: 1101 btstack_assert(0); 1102 break; 1103 case MESH_PDU_TYPE_TRANSPORT: 1104 mesh_upper_transport_send_segmented_control_pdu((mesh_transport_pdu_t *) pdu); 1105 break; 1106 default: 1107 break; 1108 } 1109 } else { 1110 switch (pdu->pdu_type){ 1111 case MESH_PDU_TYPE_NETWORK: 1112 btstack_assert(0); 1113 break; 1114 case MESH_PDU_TYPE_MESSAGE: 1115 mesh_upper_transport_send_unsegmented_access_pdu((mesh_message_pdu_t *) pdu); 1116 break; 1117 case MESH_PDU_TYPE_TRANSPORT: 1118 mesh_upper_transport_send_segmented_access_pdu((mesh_transport_pdu_t *) pdu); 1119 break; 1120 default: 1121 break; 1122 } 1123 } 1124 } 1125 } 1126 1127 void mesh_upper_transport_register_access_message_handler(void (*callback)(mesh_pdu_t *pdu)){ 1128 mesh_access_message_handler = callback; 1129 } 1130 1131 void mesh_upper_transport_register_control_message_handler(void (*callback)(mesh_pdu_t *pdu)){ 1132 mesh_control_message_handler = callback; 1133 } 1134 1135 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)){ 1136 higher_layer_handler = pdu_handler; 1137 } 1138 1139 void mesh_upper_transport_init(){ 1140 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1141 } 1142 1143 // TODO: higher layer define used for assert 1144 #define MESH_ACCESS_OPCODE_NOT_SET 0xFFFFFFFEu 1145 1146 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 1147 btstack_assert(pdu->pdu_type != MESH_PDU_TYPE_NETWORK); 1148 1149 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1150 mesh_upper_transport_run(); 1151 } 1152 1153 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 1154 if (pdu->pdu_type == MESH_PDU_TYPE_NETWORK){ 1155 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 1156 } 1157 1158 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1159 mesh_upper_transport_run(); 1160 } 1161