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