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