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