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