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 // combined key x address iterator for upper transport decryption 61 62 typedef struct { 63 // state 64 mesh_transport_key_iterator_t key_it; 65 mesh_virtual_address_iterator_t address_it; 66 // elements 67 const mesh_transport_key_t * key; 68 const mesh_virtual_address_t * address; 69 // address - might be virtual 70 uint16_t dst; 71 // key info 72 } mesh_transport_key_and_virtual_address_iterator_t; 73 74 static void (*higher_layer_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 75 76 static void mesh_upper_transport_validate_unsegmented_message(void); 77 static void mesh_upper_transport_validate_segmented_message(void); 78 static void mesh_upper_transport_run(void); 79 80 static int crypto_active; 81 static mesh_unsegmented_incoming_pdu_t * incoming_unsegmented_pdu_raw; 82 static mesh_network_pdu_t * incoming_network_pdu_decoded; 83 static mesh_transport_pdu_t incoming_transport_pdu_singleton; 84 static mesh_transport_pdu_t * incoming_transport_pdu_raw; 85 static mesh_transport_pdu_t * incoming_transport_pdu_decoded; 86 static mesh_message_pdu_t incoming_message_pdu_singleton; 87 static uint8_t application_nonce[13]; 88 static btstack_crypto_ccm_t ccm; 89 static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; 90 91 // upper transport callbacks - in access layer 92 static void (*mesh_access_message_handler)(mesh_pdu_t * pdu); 93 static void (*mesh_control_message_handler)(mesh_pdu_t * pdu); 94 95 // incoming unsegmented (network) and segmented (transport) control and access messages 96 static btstack_linked_list_t upper_transport_incoming; 97 98 // outgoing unsegmented (network) and segmented (uppert_transport_outgoing) control and access messages 99 static btstack_linked_list_t upper_transport_outgoing; 100 101 102 // TODO: higher layer define used for assert 103 #define MESH_ACCESS_OPCODE_NOT_SET 0xFFFFFFFEu 104 105 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 106 btstack_assert(pdu->pdu_type != MESH_PDU_TYPE_NETWORK); 107 108 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 109 mesh_upper_transport_run(); 110 } 111 112 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 113 if (pdu->pdu_type == MESH_PDU_TYPE_NETWORK){ 114 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 115 } 116 117 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 118 mesh_upper_transport_run(); 119 } 120 121 static void mesh_print_hex(const char * name, const uint8_t * data, uint16_t len){ 122 printf("%-20s ", name); 123 printf_hexdump(data, len); 124 } 125 // static void mesh_print_x(const char * name, uint32_t value){ 126 // printf("%20s: 0x%x", name, (int) value); 127 // } 128 129 static void mesh_transport_key_and_virtual_address_iterator_init(mesh_transport_key_and_virtual_address_iterator_t *it, 130 uint16_t dst, uint16_t netkey_index, uint8_t akf, 131 uint8_t aid) { 132 printf("KEY_INIT: dst %04x, akf %x, aid %x\n", dst, akf, aid); 133 // config 134 it->dst = dst; 135 // init elements 136 it->key = NULL; 137 it->address = NULL; 138 // init element iterators 139 mesh_transport_key_aid_iterator_init(&it->key_it, netkey_index, akf, aid); 140 // init address iterator 141 if (mesh_network_address_virtual(it->dst)){ 142 mesh_virtual_address_iterator_init(&it->address_it, dst); 143 // get first key 144 if (mesh_transport_key_aid_iterator_has_more(&it->key_it)) { 145 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 146 } 147 } 148 } 149 150 // cartesian product: keys x addressses 151 static int mesh_transport_key_and_virtual_address_iterator_has_more(mesh_transport_key_and_virtual_address_iterator_t * it){ 152 if (mesh_network_address_virtual(it->dst)) { 153 // find next valid entry 154 while (true){ 155 if (mesh_virtual_address_iterator_has_more(&it->address_it)) return 1; 156 if (!mesh_transport_key_aid_iterator_has_more(&it->key_it)) return 0; 157 // get next key 158 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 159 mesh_virtual_address_iterator_init(&it->address_it, it->dst); 160 } 161 } else { 162 return mesh_transport_key_aid_iterator_has_more(&it->key_it); 163 } 164 } 165 166 static void mesh_transport_key_and_virtual_address_iterator_next(mesh_transport_key_and_virtual_address_iterator_t * it){ 167 if (mesh_network_address_virtual(it->dst)) { 168 it->address = mesh_virtual_address_iterator_get_next(&it->address_it); 169 } else { 170 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 171 } 172 } 173 174 // UPPER TRANSPORT 175 176 // stub lower transport 177 178 static void mesh_upper_transport_dump_pdus(const char *name, btstack_linked_list_t *list){ 179 printf("List: %s:\n", name); 180 btstack_linked_list_iterator_t it; 181 btstack_linked_list_iterator_init(&it, list); 182 while (btstack_linked_list_iterator_has_next(&it)){ 183 mesh_pdu_t * pdu = (mesh_pdu_t*) btstack_linked_list_iterator_next(&it); 184 printf("- %p\n", pdu); 185 // printf_hexdump( mesh_pdu_data(pdu), mesh_pdu_len(pdu)); 186 } 187 } 188 189 static void mesh_upper_transport_reset_pdus(btstack_linked_list_t *list){ 190 while (!btstack_linked_list_empty(list)){ 191 mesh_upper_transport_pdu_free((mesh_pdu_t *) btstack_linked_list_pop(list)); 192 } 193 } 194 195 void mesh_upper_transport_dump(void){ 196 printf("incoming_unsegmented_pdu_raw: %p\n", incoming_unsegmented_pdu_raw); 197 printf("incoming_network_pdu_decoded: %p\n", incoming_network_pdu_decoded); 198 mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); 199 } 200 201 void mesh_upper_transport_reset(void){ 202 crypto_active = 0; 203 if (incoming_unsegmented_pdu_raw){ 204 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&incoming_unsegmented_pdu_raw->segments); 205 btstack_assert(network_pdu != NULL); 206 mesh_network_pdu_free(network_pdu); 207 incoming_unsegmented_pdu_raw = NULL; 208 } 209 mesh_upper_transport_reset_pdus(&upper_transport_incoming); 210 } 211 212 static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ 213 // get IV Index and IVI 214 uint32_t iv_index = mesh_get_iv_index(); 215 int ivi = ivi_nid >> 7; 216 217 // if least significant bit differs, use previous IV Index 218 if ((iv_index & 1 ) ^ ivi){ 219 iv_index--; 220 } 221 return iv_index; 222 } 223 224 static void transport_unsegmented_setup_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ 225 nonce[1] = 0x00; // SZMIC if a Segmented Access message or 0 for all other message formats 226 (void)memcpy(&nonce[2], &network_pdu->data[2], 7); 227 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(network_pdu->data[0])); 228 } 229 230 static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_transport_pdu_t * transport_pdu){ 231 nonce[1] = transport_pdu->transmic_len == 8 ? 0x80 : 0x00; 232 (void)memcpy(&nonce[2], &transport_pdu->network_header[2], 7); 233 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(transport_pdu->network_header[0])); 234 } 235 236 static void transport_unsegmented_setup_application_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ 237 nonce[0] = 0x01; 238 transport_unsegmented_setup_nonce(nonce, network_pdu); 239 mesh_print_hex("AppNonce", nonce, 13); 240 } 241 242 static void transport_unsegmented_setup_device_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ 243 nonce[0] = 0x02; 244 transport_unsegmented_setup_nonce(nonce, network_pdu); 245 mesh_print_hex("DeviceNonce", nonce, 13); 246 } 247 248 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_transport_pdu_t * transport_pdu){ 249 nonce[0] = 0x01; 250 transport_segmented_setup_nonce(nonce, transport_pdu); 251 mesh_print_hex("AppNonce", nonce, 13); 252 } 253 254 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_transport_pdu_t * transport_pdu){ 255 nonce[0] = 0x02; 256 transport_segmented_setup_nonce(nonce, transport_pdu); 257 mesh_print_hex("DeviceNonce", nonce, 13); 258 } 259 260 static void mesh_upper_unsegmented_control_message_received(mesh_network_pdu_t * network_pdu){ 261 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 262 uint8_t opcode = lower_transport_pdu[0]; 263 if (mesh_control_message_handler){ 264 mesh_control_message_handler((mesh_pdu_t*) network_pdu); 265 } else { 266 printf("[!] Unhandled Control message with opcode %02x\n", opcode); 267 // done 268 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) network_pdu); 269 } 270 } 271 272 static void mesh_upper_transport_process_message_done(mesh_message_pdu_t *message_pdu){ 273 crypto_active = 0; 274 btstack_assert(message_pdu == &incoming_message_pdu_singleton); 275 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&incoming_message_pdu_singleton.segments); 276 if (mesh_network_control(network_pdu)) { 277 btstack_assert(0); 278 } else { 279 btstack_assert(network_pdu != NULL); 280 mesh_network_pdu_free(network_pdu); 281 mesh_pdu_t * pdu = (mesh_pdu_t *) incoming_unsegmented_pdu_raw; 282 incoming_unsegmented_pdu_raw = NULL; 283 mesh_lower_transport_message_processed_by_higher_layer(pdu); 284 } 285 mesh_upper_transport_run(); 286 } 287 288 static void mesh_upper_transport_process_unsegmented_message_done(mesh_network_pdu_t *network_pdu){ 289 crypto_active = 0; 290 if (mesh_network_control(network_pdu)) { 291 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) network_pdu); 292 } else { 293 btstack_assert(network_pdu != NULL); 294 mesh_network_pdu_free(network_pdu); 295 mesh_pdu_t * pdu = (mesh_pdu_t *) incoming_unsegmented_pdu_raw; 296 incoming_unsegmented_pdu_raw = NULL; 297 incoming_unsegmented_pdu_raw = NULL; 298 mesh_lower_transport_message_processed_by_higher_layer(pdu); 299 } 300 mesh_upper_transport_run(); 301 } 302 303 static void mesh_upper_transport_process_segmented_message_done(mesh_transport_pdu_t *transport_pdu){ 304 crypto_active = 0; 305 if (mesh_transport_ctl(transport_pdu)) { 306 btstack_assert(0); 307 } else { 308 mesh_transport_pdu_free(transport_pdu); 309 incoming_transport_pdu_raw = NULL; 310 } 311 mesh_upper_transport_run(); 312 } 313 314 static void mesh_upper_transport_validate_unsegmented_message_ccm(void * arg){ 315 UNUSED(arg); 316 317 uint8_t * lower_transport_pdu = mesh_network_pdu_data(incoming_network_pdu_decoded); 318 uint8_t trans_mic_len = 4; 319 320 // store TransMIC 321 uint8_t trans_mic[8]; 322 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 323 mesh_print_hex("TransMIC", trans_mic, trans_mic_len); 324 325 uint8_t * upper_transport_pdu = mesh_network_pdu_data(incoming_network_pdu_decoded) + 1; 326 uint8_t upper_transport_pdu_len = mesh_network_pdu_len(incoming_network_pdu_decoded) - 1; 327 328 mesh_print_hex("Decryted PDU", upper_transport_pdu, upper_transport_pdu_len - trans_mic_len); 329 330 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len - trans_mic_len], trans_mic_len) == 0){ 331 printf("TransMIC matches\n"); 332 333 // remove TransMIC from payload 334 incoming_network_pdu_decoded->len -= trans_mic_len; 335 336 // if virtual address, update dst to pseudo_dst 337 if (mesh_network_address_virtual(mesh_network_dst(incoming_network_pdu_decoded))){ 338 big_endian_store_16(incoming_network_pdu_decoded->data, 7, mesh_transport_key_it.address->pseudo_dst); 339 } 340 341 // pass to upper layer 342 if (mesh_access_message_handler){ 343 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_network_pdu_decoded; 344 incoming_network_pdu_decoded = NULL; 345 mesh_access_message_handler((mesh_pdu_t*) &incoming_message_pdu_singleton); 346 } else { 347 printf("[!] Unhandled Unsegmented Access message\n"); 348 // done 349 mesh_upper_transport_process_unsegmented_message_done(incoming_network_pdu_decoded); 350 } 351 352 printf("\n"); 353 } else { 354 uint8_t afk = lower_transport_pdu[0] & 0x40; 355 if (afk){ 356 printf("TransMIC does not match, try next key\n"); 357 mesh_upper_transport_validate_unsegmented_message(); 358 } else { 359 printf("TransMIC does not match device key, done\n"); 360 // done 361 mesh_upper_transport_process_unsegmented_message_done(incoming_network_pdu_decoded); 362 } 363 } 364 } 365 366 static void mesh_upper_transport_validate_segmented_message_ccm(void * arg){ 367 UNUSED(arg); 368 369 uint8_t * upper_transport_pdu = incoming_transport_pdu_decoded->data; 370 uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->transmic_len; 371 372 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 373 374 // store TransMIC 375 uint8_t trans_mic[8]; 376 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 377 mesh_print_hex("TransMIC", trans_mic, incoming_transport_pdu_decoded->transmic_len); 378 379 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], incoming_transport_pdu_decoded->transmic_len) == 0){ 380 printf("TransMIC matches\n"); 381 382 // remove TransMIC from payload 383 incoming_transport_pdu_decoded->len -= incoming_transport_pdu_decoded->transmic_len; 384 385 // if virtual address, update dst to pseudo_dst 386 if (mesh_network_address_virtual(mesh_transport_dst(incoming_transport_pdu_decoded))){ 387 big_endian_store_16(incoming_transport_pdu_decoded->network_header, 7, mesh_transport_key_it.address->pseudo_dst); 388 } 389 390 // pass to upper layer 391 if (mesh_access_message_handler){ 392 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_transport_pdu_decoded; 393 incoming_network_pdu_decoded = NULL; 394 mesh_access_message_handler(pdu); 395 } else { 396 printf("[!] Unhandled Segmented Access/Control message\n"); 397 // done 398 mesh_upper_transport_process_segmented_message_done(incoming_transport_pdu_decoded); 399 } 400 401 printf("\n"); 402 403 } else { 404 uint8_t akf = incoming_transport_pdu_decoded->akf_aid_control & 0x40; 405 if (akf){ 406 printf("TransMIC does not match, try next key\n"); 407 mesh_upper_transport_validate_segmented_message(); 408 } else { 409 printf("TransMIC does not match device key, done\n"); 410 // done 411 mesh_upper_transport_process_segmented_message_done(incoming_transport_pdu_decoded); 412 } 413 } 414 } 415 416 static void mesh_upper_transport_validate_segmented_message_digest(void * arg){ 417 UNUSED(arg); 418 uint8_t upper_transport_pdu_len = incoming_transport_pdu_raw->len - incoming_transport_pdu_raw->transmic_len; 419 uint8_t * upper_transport_pdu_data_in = incoming_transport_pdu_raw->data; 420 uint8_t * upper_transport_pdu_data_out = incoming_transport_pdu_decoded->data; 421 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); 422 } 423 424 static void mesh_upper_transport_validate_unsegmented_message_digest(void * arg){ 425 UNUSED(arg); 426 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&incoming_unsegmented_pdu_raw->segments); 427 uint8_t trans_mic_len = 4; 428 uint8_t lower_transport_pdu_len = network_pdu->len - 9; 429 uint8_t * upper_transport_pdu_data_in = &network_pdu->data[10]; 430 uint8_t * upper_transport_pdu_data_out = &incoming_network_pdu_decoded->data[10]; 431 uint8_t upper_transport_pdu_len = lower_transport_pdu_len - 1 - trans_mic_len; 432 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); 433 } 434 435 static void mesh_upper_transport_validate_unsegmented_message(void){ 436 437 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 438 printf("No valid transport key found\n"); 439 mesh_upper_transport_process_unsegmented_message_done(incoming_network_pdu_decoded); 440 return; 441 } 442 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 443 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 444 445 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&incoming_unsegmented_pdu_raw->segments); 446 if (message_key->akf){ 447 transport_unsegmented_setup_application_nonce(application_nonce, network_pdu); 448 } else { 449 transport_unsegmented_setup_device_nonce(application_nonce, network_pdu); 450 } 451 452 // store application / device key index 453 mesh_print_hex("AppOrDevKey", message_key->key, 16); 454 incoming_message_pdu_singleton.appkey_index = message_key->appkey_index; 455 456 // unsegmented message have TransMIC of 32 bit 457 uint8_t trans_mic_len = 4; 458 printf("Unsegmented Access message with TransMIC len 4\n"); 459 460 uint8_t lower_transport_pdu_len = network_pdu->len - 9; 461 uint8_t * upper_transport_pdu_data = &network_pdu->data[10]; 462 uint8_t upper_transport_pdu_len = lower_transport_pdu_len - 1 - trans_mic_len; 463 464 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 465 466 // decrypt ccm 467 crypto_active = 1; 468 uint16_t aad_len = 0; 469 if (mesh_network_address_virtual(mesh_network_dst(incoming_network_pdu_decoded))){ 470 aad_len = 16; 471 } 472 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, trans_mic_len); 473 if (aad_len){ 474 btstack_crypto_ccm_digest(&ccm, (uint8_t*) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_unsegmented_message_digest, NULL); 475 } else { 476 mesh_upper_transport_validate_unsegmented_message_digest(incoming_network_pdu_decoded); 477 } 478 } 479 480 static void mesh_upper_transport_validate_segmented_message(void){ 481 uint8_t * upper_transport_pdu_data = incoming_transport_pdu_decoded->data; 482 uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->transmic_len; 483 484 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 485 printf("No valid transport key found\n"); 486 mesh_upper_transport_process_segmented_message_done(incoming_transport_pdu_decoded); 487 return; 488 } 489 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 490 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 491 492 if (message_key->akf){ 493 transport_segmented_setup_application_nonce(application_nonce, incoming_transport_pdu_raw); 494 } else { 495 transport_segmented_setup_device_nonce(application_nonce, incoming_transport_pdu_raw); 496 } 497 498 // store application / device key index 499 mesh_print_hex("AppOrDevKey", message_key->key, 16); 500 incoming_transport_pdu_decoded->appkey_index = message_key->appkey_index; 501 502 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 503 504 // decrypt ccm 505 crypto_active = 1; 506 uint16_t aad_len = 0; 507 if (mesh_network_address_virtual(mesh_transport_dst(incoming_transport_pdu_decoded))){ 508 aad_len = 16; 509 } 510 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, incoming_transport_pdu_decoded->transmic_len); 511 512 if (aad_len){ 513 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_segmented_message_digest, NULL); 514 } else { 515 mesh_upper_transport_validate_segmented_message_digest(NULL); 516 } 517 } 518 519 static void mesh_upper_transport_process_unsegmented_access_message(void){ 520 // copy original pdu 521 mesh_network_pdu_t * raw_network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&incoming_unsegmented_pdu_raw->segments); 522 incoming_network_pdu_decoded->len = raw_network_pdu->len; 523 (void)memcpy(incoming_network_pdu_decoded->data, 524 raw_network_pdu->data, 525 incoming_network_pdu_decoded->len); 526 527 // 528 uint8_t * lower_transport_pdu = &raw_network_pdu->data[9]; 529 uint8_t lower_transport_pdu_len = raw_network_pdu->len - 9; 530 531 mesh_print_hex("Lower Transport network pdu", &raw_network_pdu->data[9], lower_transport_pdu_len); 532 533 uint8_t aid = lower_transport_pdu[0] & 0x3f; 534 uint8_t akf = (lower_transport_pdu[0] & 0x40) >> 6; 535 printf("AKF: %u\n", akf); 536 printf("AID: %02x\n", aid); 537 538 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_network_dst(incoming_network_pdu_decoded), 539 incoming_network_pdu_decoded->netkey_index, akf, aid); 540 mesh_upper_transport_validate_unsegmented_message(); 541 } 542 543 static void mesh_upper_transport_process_message(void){ 544 // copy original pdu 545 (void)memcpy(incoming_transport_pdu_decoded, incoming_transport_pdu_raw, 546 sizeof(mesh_transport_pdu_t)); 547 548 // 549 uint8_t * upper_transport_pdu = incoming_transport_pdu_decoded->data; 550 uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->transmic_len; 551 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 552 553 uint8_t aid = incoming_transport_pdu_decoded->akf_aid_control & 0x3f; 554 uint8_t akf = (incoming_transport_pdu_decoded->akf_aid_control & 0x40) >> 6; 555 556 printf("AKF: %u\n", akf); 557 printf("AID: %02x\n", aid); 558 559 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_transport_dst(incoming_transport_pdu_decoded), 560 incoming_transport_pdu_decoded->netkey_index, akf, aid); 561 mesh_upper_transport_validate_segmented_message(); 562 } 563 564 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 565 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 566 mesh_upper_transport_run(); 567 } 568 569 570 571 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 572 switch (callback_type){ 573 case MESH_TRANSPORT_PDU_RECEIVED: 574 mesh_upper_transport_message_received(pdu); 575 break; 576 case MESH_TRANSPORT_PDU_SENT: 577 // notify upper layer (or just free pdu) 578 if (higher_layer_handler){ 579 higher_layer_handler(callback_type, status, pdu); 580 } else { 581 mesh_upper_transport_pdu_free(pdu); 582 } 583 mesh_upper_transport_run(); 584 break; 585 default: 586 break; 587 } 588 } 589 static void mesh_upper_transport_send_unsegmented_access_pdu_ccm(void * arg){ 590 crypto_active = 0; 591 592 mesh_message_pdu_t * message_pdu = (mesh_message_pdu_t *) arg; 593 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 594 595 uint8_t * upper_transport_pdu = mesh_network_pdu_data(network_pdu) + 1; 596 uint8_t upper_transport_pdu_len = mesh_network_pdu_len(network_pdu) - 1; 597 mesh_print_hex("EncAccessPayload", upper_transport_pdu, upper_transport_pdu_len); 598 // store TransMIC 599 btstack_crypto_ccm_get_authentication_value(&ccm, &upper_transport_pdu[upper_transport_pdu_len]); 600 mesh_print_hex("TransMIC", &upper_transport_pdu[upper_transport_pdu_len], 4); 601 network_pdu->len += 4; 602 upper_transport_pdu_len += 4; 603 mesh_print_hex("UpperTransportPDU", upper_transport_pdu, upper_transport_pdu_len); 604 // send network pdu 605 mesh_lower_transport_send_pdu((mesh_pdu_t*) message_pdu); 606 } 607 608 static void mesh_upper_transport_send_segmented_access_pdu_ccm(void * arg){ 609 crypto_active = 0; 610 611 mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) arg; 612 mesh_print_hex("EncAccessPayload", transport_pdu->data, transport_pdu->len); 613 // store TransMIC 614 btstack_crypto_ccm_get_authentication_value(&ccm, &transport_pdu->data[transport_pdu->len]); 615 mesh_print_hex("TransMIC", &transport_pdu->data[transport_pdu->len], transport_pdu->transmic_len); 616 transport_pdu->len += transport_pdu->transmic_len; 617 mesh_print_hex("UpperTransportPDU", transport_pdu->data, transport_pdu->len); 618 mesh_lower_transport_send_pdu((mesh_pdu_t*) transport_pdu); 619 } 620 621 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, 622 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 623 624 if (control_pdu_len > 11) return 1; 625 626 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 627 if (!network_key) return 1; 628 629 uint8_t transport_pdu_data[12]; 630 transport_pdu_data[0] = opcode; 631 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 632 uint16_t transport_pdu_len = control_pdu_len + 1; 633 634 // setup network_pdu 635 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 636 637 return 0; 638 } 639 640 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, 641 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 642 643 if (control_pdu_len > 256) return 1; 644 645 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 646 if (!network_key) return 1; 647 648 (void)memcpy(transport_pdu->data, control_pdu_data, control_pdu_len); 649 transport_pdu->len = control_pdu_len; 650 transport_pdu->netkey_index = netkey_index; 651 transport_pdu->akf_aid_control = opcode; 652 transport_pdu->transmic_len = 0; // no TransMIC for control 653 mesh_transport_set_nid_ivi(transport_pdu, network_key->nid); 654 mesh_transport_set_src(transport_pdu, src); 655 mesh_transport_set_dest(transport_pdu, dest); 656 mesh_transport_set_ctl_ttl(transport_pdu, 0x80 | ttl); 657 658 return 0; 659 } 660 661 uint8_t mesh_upper_transport_setup_control_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, 662 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 663 switch (pdu->pdu_type){ 664 case MESH_PDU_TYPE_NETWORK: 665 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); 666 case MESH_PDU_TYPE_TRANSPORT: 667 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); 668 case MESH_PDU_TYPE_MESSAGE: 669 btstack_assert(0); 670 break; 671 default: 672 return 1; 673 } 674 } 675 676 static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu_header(mesh_message_pdu_t * message_pdu, uint16_t netkey_index, 677 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest){ 678 679 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 680 681 // get app or device key 682 const mesh_transport_key_t * appkey; 683 appkey = mesh_transport_key_get(appkey_index); 684 if (appkey == NULL){ 685 printf("appkey_index %x unknown\n", appkey_index); 686 return 1; 687 } 688 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 689 690 // lookup network by netkey_index 691 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 692 if (!network_key) return 1; 693 694 message_pdu->appkey_index = appkey_index; 695 696 network_pdu->data[9] = akf_aid; 697 // setup network_pdu 698 mesh_network_setup_pdu_header(network_pdu, netkey_index, network_key->nid, 0, ttl, 0, src, dest); 699 return 0; 700 } 701 702 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, 703 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 704 705 int status = mesh_upper_transport_setup_unsegmented_access_pdu_header(message_pdu, netkey_index, appkey_index, ttl, src, dest); 706 if (status) return status; 707 708 // store in transport pdu 709 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 710 (void)memcpy(&network_pdu->data[10], access_pdu_data, access_pdu_len); 711 network_pdu->len = 10 + access_pdu_len; 712 return 0; 713 } 714 715 static uint8_t mesh_upper_transport_setup_segmented_access_pdu_header(mesh_transport_pdu_t * transport_pdu, uint16_t netkey_index, 716 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 717 718 // get app or device key 719 const mesh_transport_key_t *appkey; 720 appkey = mesh_transport_key_get(appkey_index); 721 if (appkey == NULL) { 722 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 723 return 1; 724 } 725 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 726 727 // lookup network by netkey_index 728 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 729 if (!network_key) return 1; 730 if (network_key == NULL) { 731 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 732 return 1; 733 } 734 735 const uint8_t trans_mic_len = szmic ? 8 : 4; 736 737 // store in transport pdu 738 transport_pdu->transmic_len = trans_mic_len; 739 transport_pdu->netkey_index = netkey_index; 740 transport_pdu->appkey_index = appkey_index; 741 transport_pdu->akf_aid_control = akf_aid; 742 mesh_transport_set_nid_ivi(transport_pdu, network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7)); 743 mesh_transport_set_src(transport_pdu, src); 744 mesh_transport_set_dest(transport_pdu, dest); 745 mesh_transport_set_ctl_ttl(transport_pdu, ttl); 746 return 0; 747 } 748 749 750 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, 751 uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 752 int status = mesh_upper_transport_setup_segmented_access_pdu_header(transport_pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 753 if (status) return status; 754 755 // store in transport pdu 756 (void)memcpy(transport_pdu->data, access_pdu_data, access_pdu_len); 757 transport_pdu->len = access_pdu_len; 758 return 0; 759 } 760 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 761 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 762 switch (pdu->pdu_type){ 763 case MESH_PDU_TYPE_NETWORK: 764 btstack_assert(0); 765 case MESH_PDU_TYPE_TRANSPORT: 766 return mesh_upper_transport_setup_segmented_access_pdu_header((mesh_transport_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 767 case MESH_PDU_TYPE_MESSAGE: 768 return mesh_upper_transport_setup_unsegmented_access_pdu_header((mesh_message_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest); 769 default: 770 return 1; 771 } 772 } 773 774 uint8_t mesh_upper_transport_setup_access_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 775 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic, 776 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 777 switch (pdu->pdu_type){ 778 case MESH_PDU_TYPE_NETWORK: 779 btstack_assert(0); 780 break; 781 case MESH_PDU_TYPE_MESSAGE: 782 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); 783 case MESH_PDU_TYPE_TRANSPORT: 784 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); 785 default: 786 return 1; 787 } 788 } 789 790 static void mesh_upper_transport_send_unsegmented_access_pdu_digest(void * arg){ 791 mesh_message_pdu_t * message_pdu = (mesh_message_pdu_t *) arg; 792 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 793 uint8_t * access_pdu_data = mesh_network_pdu_data(network_pdu) + 1; 794 uint16_t access_pdu_len = mesh_network_pdu_len(network_pdu) - 1; 795 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); 796 } 797 798 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 799 // Device Key is fixed 800 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 801 return mesh_transport_key_get(appkey_index); 802 } 803 804 // Get key refresh state from subnet 805 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 806 if (subnet == NULL) return NULL; 807 808 // identify old and new app keys for given appkey_index 809 mesh_transport_key_t * old_key = NULL; 810 mesh_transport_key_t * new_key = NULL; 811 mesh_transport_key_iterator_t it; 812 mesh_transport_key_iterator_init(&it, netkey_index); 813 while (mesh_transport_key_iterator_has_more(&it)){ 814 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 815 if (transport_key->appkey_index != appkey_index) continue; 816 if (transport_key->old_key == 0) { 817 new_key = transport_key; 818 } else { 819 old_key = transport_key; 820 } 821 } 822 823 // if no key is marked as old, just use the current one 824 if (old_key == NULL) return new_key; 825 826 // use new key if it exists in phase two 827 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 828 return new_key; 829 } else { 830 return old_key; 831 } 832 } 833 834 static void mesh_upper_transport_send_unsegmented_access_pdu(mesh_message_pdu_t * message_pdu){ 835 836 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 837 838 // if dst is virtual address, lookup label uuid and hash 839 uint16_t aad_len = 0; 840 mesh_virtual_address_t * virtual_address = NULL; 841 uint16_t dst = mesh_network_dst(network_pdu); 842 if (mesh_network_address_virtual(dst)){ 843 virtual_address = mesh_virtual_address_for_pseudo_dst(dst); 844 if (!virtual_address){ 845 printf("No virtual address register for pseudo dst %4x\n", dst); 846 btstack_memory_mesh_network_pdu_free(network_pdu); 847 return; 848 } 849 aad_len = 16; 850 big_endian_store_16(network_pdu->data, 7, virtual_address->hash); 851 } 852 853 // reserve slot 854 mesh_lower_transport_reserve_slot(); 855 856 // Nonce for Access Payload based on Network Sequence number: needs to be fixed now and lower layers need to send packet in right order 857 uint32_t seq = mesh_sequence_number_next(); 858 mesh_network_pdu_set_seq(network_pdu, seq); 859 860 // Dump PDU 861 printf("[+] Upper transport, send unsegmented Access PDU - dest %04x, seq %06x\n", dst, mesh_network_seq(network_pdu)); 862 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 863 864 // setup nonce 865 uint16_t appkey_index = message_pdu->appkey_index; 866 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 867 transport_unsegmented_setup_device_nonce(application_nonce, network_pdu); 868 } else { 869 transport_unsegmented_setup_application_nonce(application_nonce, network_pdu); 870 } 871 872 // get app or device key 873 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(network_pdu->netkey_index, appkey_index); 874 mesh_print_hex("AppOrDevKey", appkey->key, 16); 875 876 // encrypt ccm 877 uint8_t trans_mic_len = 4; 878 uint16_t access_pdu_len = mesh_network_pdu_len(network_pdu) - 1; 879 crypto_active = 1; 880 881 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, trans_mic_len); 882 if (virtual_address){ 883 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 884 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, &mesh_upper_transport_send_unsegmented_access_pdu_digest, message_pdu); 885 } else { 886 mesh_upper_transport_send_unsegmented_access_pdu_digest(message_pdu); 887 } 888 } 889 890 static void mesh_upper_transport_send_segmented_access_pdu_digest(void *arg){ 891 mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) arg; 892 uint16_t access_pdu_len = transport_pdu->len; 893 uint8_t * access_pdu_data = transport_pdu->data; 894 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); 895 } 896 897 static void mesh_upper_transport_send_segmented_access_pdu(mesh_transport_pdu_t * transport_pdu){ 898 899 // if dst is virtual address, lookup label uuid and hash 900 uint16_t aad_len = 0; 901 mesh_virtual_address_t * virtual_address = NULL; 902 uint16_t dst = mesh_transport_dst(transport_pdu); 903 if (mesh_network_address_virtual(dst)){ 904 virtual_address = mesh_virtual_address_for_pseudo_dst(dst); 905 if (!virtual_address){ 906 printf("No virtual address register for pseudo dst %4x\n", dst); 907 btstack_memory_mesh_transport_pdu_free(transport_pdu); 908 return; 909 } 910 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 911 // printf_hexdump(virtual_address->label_uuid, 16); 912 aad_len = 16; 913 big_endian_store_16(transport_pdu->network_header, 7, virtual_address->hash); 914 } 915 916 // get app or device key 917 uint16_t appkey_index = transport_pdu->appkey_index; 918 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(transport_pdu->netkey_index, appkey_index); 919 if (appkey == NULL){ 920 printf("AppKey %04x not found, drop message\n", appkey_index); 921 btstack_memory_mesh_transport_pdu_free(transport_pdu); 922 return; 923 } 924 925 // reserve slot 926 mesh_lower_transport_reserve_slot(); 927 928 // reserve one sequence number, which is also used to encrypt access payload 929 uint32_t seq = mesh_sequence_number_next(); 930 transport_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 931 mesh_transport_set_seq(transport_pdu, seq); 932 933 // Dump PDU 934 printf("[+] Upper transport, send segmented Access PDU - dest %04x, seq %06x\n", dst, mesh_transport_seq(transport_pdu)); 935 mesh_print_hex("Access Payload", transport_pdu->data, transport_pdu->len); 936 937 // setup nonce - uses dst, so after pseudo address translation 938 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 939 transport_segmented_setup_device_nonce(application_nonce, transport_pdu); 940 } else { 941 transport_segmented_setup_application_nonce(application_nonce, transport_pdu); 942 } 943 944 // Dump key 945 mesh_print_hex("AppOrDevKey", appkey->key, 16); 946 947 // encrypt ccm 948 uint8_t transmic_len = transport_pdu->transmic_len; 949 uint16_t access_pdu_len = transport_pdu->len; 950 crypto_active = 1; 951 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 952 if (virtual_address){ 953 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 954 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, &mesh_upper_transport_send_segmented_access_pdu_digest, transport_pdu); 955 } else { 956 mesh_upper_transport_send_segmented_access_pdu_digest(transport_pdu); 957 } 958 } 959 960 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 961 // reserve slot 962 mesh_lower_transport_reserve_slot(); 963 // reserve sequence number 964 uint32_t seq = mesh_sequence_number_next(); 965 mesh_network_pdu_set_seq(network_pdu, seq); 966 // Dump PDU 967 uint8_t opcode = network_pdu->data[9]; 968 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 969 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 970 // send 971 mesh_lower_transport_send_pdu((mesh_pdu_t *) network_pdu); 972 } 973 974 static void mesh_upper_transport_send_segmented_control_pdu(mesh_transport_pdu_t * transport_pdu){ 975 // reserve slot 976 mesh_lower_transport_reserve_slot(); 977 // reserve sequence number 978 uint32_t seq = mesh_sequence_number_next(); 979 transport_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 980 mesh_transport_set_seq(transport_pdu, seq); 981 // Dump PDU 982 uint8_t opcode = transport_pdu->data[0]; 983 printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", transport_pdu, seq, opcode); 984 mesh_print_hex("Access Payload", &transport_pdu->data[1], transport_pdu->len - 1); 985 // send 986 mesh_lower_transport_send_pdu((mesh_pdu_t *) transport_pdu); 987 } 988 989 static void mesh_upper_transport_run(void){ 990 991 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 992 993 if (crypto_active) return; 994 995 // peek at next message 996 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_incoming); 997 mesh_network_pdu_t * network_pdu; 998 mesh_transport_pdu_t * transport_pdu; 999 mesh_message_pdu_t * message_pdu; 1000 mesh_unsegmented_incoming_pdu_t * unsegmented_pdu; 1001 switch (pdu->pdu_type){ 1002 case MESH_PDU_TYPE_NETWORK: 1003 network_pdu = (mesh_network_pdu_t *) pdu; 1004 // control? 1005 if (mesh_network_control(network_pdu)) { 1006 (void) btstack_linked_list_pop(&upper_transport_incoming); 1007 mesh_upper_unsegmented_control_message_received(network_pdu); 1008 } else { 1009 btstack_assert(0); 1010 break; 1011 } 1012 break; 1013 case MESH_PDU_TYPE_UNSEGMENTED_INCOMING: 1014 unsegmented_pdu = (mesh_unsegmented_incoming_pdu_t *) pdu; 1015 network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&unsegmented_pdu->segments); 1016 btstack_assert(network_pdu != NULL); 1017 // control? 1018 if (mesh_network_control(network_pdu)) { 1019 // TODO: handle unsegmented control message 1020 btstack_assert(0); 1021 break; 1022 } else { 1023 incoming_network_pdu_decoded = mesh_network_pdu_get(); 1024 if (!incoming_network_pdu_decoded) return; 1025 1026 (void) btstack_linked_list_pop(&upper_transport_incoming); 1027 incoming_unsegmented_pdu_raw = unsegmented_pdu; 1028 1029 // use pre-allocated message pdu 1030 incoming_message_pdu_singleton.pdu_header.pdu_type = MESH_PDU_TYPE_MESSAGE; 1031 btstack_linked_list_add(&incoming_message_pdu_singleton.segments, (btstack_linked_item_t *) incoming_network_pdu_decoded); 1032 mesh_upper_transport_process_unsegmented_access_message(); 1033 } 1034 break; 1035 case MESH_PDU_TYPE_MESSAGE: 1036 message_pdu = (mesh_message_pdu_t *) pdu; 1037 uint8_t ctl = mesh_message_ctl(message_pdu); 1038 if (ctl){ 1039 printf("Ignoring Segmented Control Message\n"); 1040 (void) btstack_linked_list_pop(&upper_transport_incoming); 1041 mesh_lower_transport_message_processed_by_higher_layer(pdu); 1042 } else { 1043 incoming_transport_pdu_decoded = mesh_transport_pdu_get(); 1044 if (!incoming_transport_pdu_decoded) return; 1045 1046 // use pre-allocated transport buffer 1047 transport_pdu = &incoming_transport_pdu_singleton; 1048 incoming_transport_pdu_singleton.pdu_header.pdu_type = MESH_PDU_TYPE_TRANSPORT; 1049 1050 // flatten segmented message into mesh_transport_pdu_t 1051 1052 // assemble payload 1053 while (message_pdu->segments){ 1054 mesh_network_pdu_t * segment = (mesh_network_pdu_t *) btstack_linked_list_pop(&message_pdu->segments); 1055 // get segment n 1056 uint8_t * lower_transport_pdu = mesh_network_pdu_data(segment); 1057 uint8_t seg_o = ( big_endian_read_16(lower_transport_pdu, 2) >> 5) & 0x001f; 1058 uint8_t * segment_data = &lower_transport_pdu[4]; 1059 (void)memcpy(&transport_pdu->data[seg_o * 12], segment_data, 12); 1060 } 1061 1062 // copy meta data 1063 transport_pdu->len = message_pdu->len; 1064 transport_pdu->netkey_index = message_pdu->netkey_index; 1065 transport_pdu->transmic_len = message_pdu->transmic_len; 1066 transport_pdu->akf_aid_control = message_pdu->akf_aid_control; 1067 transport_pdu->flags = message_pdu->flags; 1068 transport_pdu->message_complete = message_pdu->message_complete; 1069 transport_pdu->seq_zero = message_pdu->seq_zero; 1070 (void)memcpy(transport_pdu->network_header, message_pdu->network_header, 9); 1071 1072 mesh_print_hex("Assembled payload", transport_pdu->data, transport_pdu->len); 1073 1074 // free mesh message 1075 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 1076 1077 // get encoded transport pdu and start processing 1078 incoming_transport_pdu_raw = transport_pdu; 1079 (void) btstack_linked_list_pop(&upper_transport_incoming); 1080 mesh_upper_transport_process_message(); 1081 } 1082 break; 1083 default: 1084 break; 1085 } 1086 } 1087 1088 while (!btstack_linked_list_empty(&upper_transport_outgoing)){ 1089 1090 if (crypto_active) break; 1091 1092 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_outgoing); 1093 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == 0) break; 1094 1095 (void) btstack_linked_list_pop(&upper_transport_outgoing); 1096 1097 if (mesh_pdu_ctl(pdu)){ 1098 switch (pdu->pdu_type){ 1099 case MESH_PDU_TYPE_NETWORK: 1100 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 1101 break; 1102 case MESH_PDU_TYPE_MESSAGE: 1103 btstack_assert(0); 1104 break; 1105 case MESH_PDU_TYPE_TRANSPORT: 1106 mesh_upper_transport_send_segmented_control_pdu((mesh_transport_pdu_t *) pdu); 1107 break; 1108 default: 1109 break; 1110 } 1111 } else { 1112 switch (pdu->pdu_type){ 1113 case MESH_PDU_TYPE_NETWORK: 1114 btstack_assert(0); 1115 break; 1116 case MESH_PDU_TYPE_MESSAGE: 1117 mesh_upper_transport_send_unsegmented_access_pdu((mesh_message_pdu_t *) pdu); 1118 break; 1119 case MESH_PDU_TYPE_TRANSPORT: 1120 mesh_upper_transport_send_segmented_access_pdu((mesh_transport_pdu_t *) pdu); 1121 break; 1122 default: 1123 break; 1124 } 1125 } 1126 } 1127 } 1128 1129 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 1130 mesh_network_pdu_t * network_pdu; 1131 mesh_transport_pdu_t * transport_pdu; 1132 mesh_message_pdu_t * message_pdu; 1133 switch (pdu->pdu_type) { 1134 case MESH_PDU_TYPE_NETWORK: 1135 network_pdu = (mesh_network_pdu_t *) pdu; 1136 mesh_network_pdu_free(network_pdu); 1137 break; 1138 case MESH_PDU_TYPE_TRANSPORT: 1139 transport_pdu = (mesh_transport_pdu_t *) pdu; 1140 mesh_transport_pdu_free(transport_pdu); 1141 break; 1142 case MESH_PDU_TYPE_MESSAGE: 1143 message_pdu = (mesh_message_pdu_t *) pdu; 1144 mesh_message_pdu_free(message_pdu); 1145 default: 1146 break; 1147 } 1148 } 1149 1150 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 1151 crypto_active = 0; 1152 switch (pdu->pdu_type){ 1153 case MESH_PDU_TYPE_NETWORK: 1154 mesh_upper_transport_process_unsegmented_message_done((mesh_network_pdu_t *) pdu); 1155 break; 1156 case MESH_PDU_TYPE_TRANSPORT: 1157 mesh_upper_transport_process_segmented_message_done((mesh_transport_pdu_t *) pdu); 1158 break; 1159 case MESH_PDU_TYPE_MESSAGE: 1160 mesh_upper_transport_process_message_done((mesh_message_pdu_t *) pdu); 1161 break; 1162 default: 1163 break; 1164 } 1165 } 1166 1167 void mesh_upper_transport_register_access_message_handler(void (*callback)(mesh_pdu_t *pdu)){ 1168 mesh_access_message_handler = callback; 1169 } 1170 1171 void mesh_upper_transport_register_control_message_handler(void (*callback)(mesh_pdu_t *pdu)){ 1172 mesh_control_message_handler = callback; 1173 } 1174 1175 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)){ 1176 higher_layer_handler = pdu_handler; 1177 } 1178 1179 void mesh_upper_transport_init(){ 1180 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1181 } 1182