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_control_pdu_t incoming_control_pdu_singleton; 90 static mesh_control_pdu_t * incoming_control_pdu; 91 92 static mesh_segmented_pdu_t outgoing_segmented_message_singleton; 93 static mesh_access_pdu_t * outgoing_segmented_access_pdu; 94 95 static mesh_unsegmented_pdu_t outgoing_unsegmented_pdu_singleton; 96 static mesh_upper_transport_pdu_t * outgoing_upper_transport_pdu; 97 98 static uint8_t application_nonce[13]; 99 static btstack_crypto_ccm_t ccm; 100 static uint8_t crypto_buffer[MESH_ACCESS_PAYLOAD_MAX]; 101 static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; 102 103 // upper transport callbacks - in access layer 104 static void (*mesh_access_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 105 static void (*mesh_control_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 106 107 // incoming unsegmented (network) and segmented (transport) control and access messages 108 static btstack_linked_list_t upper_transport_incoming; 109 110 // outgoing unsegmented (network) and segmented (uppert_transport_outgoing) control and access messages 111 static btstack_linked_list_t upper_transport_outgoing; 112 113 114 // TODO: higher layer define used for assert 115 #define MESH_ACCESS_OPCODE_NOT_SET 0xFFFFFFFEu 116 117 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 118 switch (pdu->pdu_type){ 119 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 120 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 121 break; 122 default: 123 btstack_assert(false); 124 break; 125 } 126 127 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 128 mesh_upper_transport_run(); 129 } 130 131 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 132 switch (pdu->pdu_type){ 133 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 134 break; 135 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 136 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 137 break; 138 default: 139 btstack_assert(false); 140 break; 141 } 142 143 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 144 mesh_upper_transport_run(); 145 } 146 147 static void mesh_print_hex(const char * name, const uint8_t * data, uint16_t len){ 148 printf("%-20s ", name); 149 printf_hexdump(data, len); 150 } 151 // static void mesh_print_x(const char * name, uint32_t value){ 152 // printf("%20s: 0x%x", name, (int) value); 153 // } 154 155 static void mesh_transport_key_and_virtual_address_iterator_init(mesh_transport_key_and_virtual_address_iterator_t *it, 156 uint16_t dst, uint16_t netkey_index, uint8_t akf, 157 uint8_t aid) { 158 printf("KEY_INIT: dst %04x, akf %x, aid %x\n", dst, akf, aid); 159 // config 160 it->dst = dst; 161 // init elements 162 it->key = NULL; 163 it->address = NULL; 164 // init element iterators 165 mesh_transport_key_aid_iterator_init(&it->key_it, netkey_index, akf, aid); 166 // init address iterator 167 if (mesh_network_address_virtual(it->dst)){ 168 mesh_virtual_address_iterator_init(&it->address_it, dst); 169 // get first key 170 if (mesh_transport_key_aid_iterator_has_more(&it->key_it)) { 171 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 172 } 173 } 174 } 175 176 // cartesian product: keys x addressses 177 static int mesh_transport_key_and_virtual_address_iterator_has_more(mesh_transport_key_and_virtual_address_iterator_t * it){ 178 if (mesh_network_address_virtual(it->dst)) { 179 // find next valid entry 180 while (true){ 181 if (mesh_virtual_address_iterator_has_more(&it->address_it)) return 1; 182 if (!mesh_transport_key_aid_iterator_has_more(&it->key_it)) return 0; 183 // get next key 184 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 185 mesh_virtual_address_iterator_init(&it->address_it, it->dst); 186 } 187 } else { 188 return mesh_transport_key_aid_iterator_has_more(&it->key_it); 189 } 190 } 191 192 static void mesh_transport_key_and_virtual_address_iterator_next(mesh_transport_key_and_virtual_address_iterator_t * it){ 193 if (mesh_network_address_virtual(it->dst)) { 194 it->address = mesh_virtual_address_iterator_get_next(&it->address_it); 195 } else { 196 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 197 } 198 } 199 200 // UPPER TRANSPORT 201 202 uint16_t mesh_access_dst(mesh_access_pdu_t * access_pdu){ 203 return big_endian_read_16(access_pdu->network_header, 7); 204 } 205 206 uint16_t mesh_access_ctl(mesh_access_pdu_t * access_pdu){ 207 return access_pdu->network_header[1] >> 7; 208 } 209 210 uint32_t mesh_access_seq(mesh_access_pdu_t * access_pdu){ 211 return big_endian_read_24(access_pdu->network_header, 2); 212 } 213 214 void mesh_access_set_nid_ivi(mesh_access_pdu_t * access_pdu, uint8_t nid_ivi){ 215 access_pdu->network_header[0] = nid_ivi; 216 } 217 void mesh_access_set_ctl_ttl(mesh_access_pdu_t * access_pdu, uint8_t ctl_ttl){ 218 access_pdu->network_header[1] = ctl_ttl; 219 } 220 void mesh_access_set_seq(mesh_access_pdu_t * access_pdu, uint32_t seq){ 221 big_endian_store_24(access_pdu->network_header, 2, seq); 222 } 223 void mesh_access_set_src(mesh_access_pdu_t * access_pdu, uint16_t src){ 224 big_endian_store_16(access_pdu->network_header, 5, src); 225 } 226 void mesh_access_set_dest(mesh_access_pdu_t * access_pdu, uint16_t dest){ 227 big_endian_store_16(access_pdu->network_header, 7, dest); 228 } 229 230 static void mesh_segmented_pdu_flatten(btstack_linked_list_t * segments, uint8_t segment_len, uint8_t * buffer) { 231 // assemble payload 232 btstack_linked_list_iterator_t it; 233 btstack_linked_list_iterator_init(&it, segments); 234 while (btstack_linked_list_iterator_has_next(&it)) { 235 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 236 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 237 // get segment n 238 uint8_t *lower_transport_pdu = mesh_network_pdu_data(segment); 239 uint8_t seg_o = (big_endian_read_16(lower_transport_pdu, 2) >> 5) & 0x001f; 240 uint8_t *segment_data = &lower_transport_pdu[4]; 241 (void) memcpy(&buffer[seg_o * segment_len], segment_data, segment_len); 242 } 243 } 244 245 static uint16_t mesh_upper_pdu_flatten(mesh_upper_transport_pdu_t * upper_pdu, uint8_t * buffer, uint16_t buffer_len) { 246 // assemble payload 247 btstack_linked_list_iterator_t it; 248 btstack_linked_list_iterator_init(&it, &upper_pdu->segments); 249 uint16_t offset = 0; 250 while (btstack_linked_list_iterator_has_next(&it)) { 251 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 252 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 253 btstack_assert((offset + segment->len) <= buffer_len); 254 (void) memcpy(&buffer[offset], segment->data, segment->len); 255 offset += segment->len; 256 } 257 return offset; 258 } 259 260 static void mesh_segmented_append_payload(const uint8_t * payload, uint16_t payload_len, btstack_linked_list_t * segments){ 261 uint16_t payload_offset = 0; 262 uint16_t bytes_current_segment = 0; 263 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_last_item(segments); 264 if (network_pdu){ 265 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX - network_pdu->len; 266 } 267 while (payload_offset < payload_len){ 268 if (bytes_current_segment == 0){ 269 network_pdu = mesh_network_pdu_get(); 270 btstack_assert(network_pdu != NULL); 271 btstack_linked_list_add_tail(segments, (btstack_linked_item_t *) network_pdu); 272 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX; 273 } 274 uint16_t bytes_to_copy = btstack_min(bytes_current_segment, payload_len - payload_offset); 275 (void) memcpy(&network_pdu->data[network_pdu->len], &payload[payload_offset], bytes_to_copy); 276 bytes_current_segment -= bytes_to_copy; 277 network_pdu->len += bytes_to_copy; 278 payload_offset += bytes_to_copy; 279 } 280 } 281 282 // stub lower transport 283 284 static void mesh_upper_transport_dump_pdus(const char *name, btstack_linked_list_t *list){ 285 printf("List: %s:\n", name); 286 btstack_linked_list_iterator_t it; 287 btstack_linked_list_iterator_init(&it, list); 288 while (btstack_linked_list_iterator_has_next(&it)){ 289 mesh_pdu_t * pdu = (mesh_pdu_t*) btstack_linked_list_iterator_next(&it); 290 printf("- %p\n", pdu); 291 // printf_hexdump( mesh_pdu_data(pdu), mesh_pdu_len(pdu)); 292 } 293 } 294 295 static void mesh_upper_transport_reset_pdus(btstack_linked_list_t *list){ 296 while (!btstack_linked_list_empty(list)){ 297 mesh_upper_transport_pdu_free((mesh_pdu_t *) btstack_linked_list_pop(list)); 298 } 299 } 300 301 void mesh_upper_transport_dump(void){ 302 printf("incoming_unsegmented_pdu_raw: %p\n", incoming_unsegmented_pdu_raw); 303 mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); 304 } 305 306 void mesh_upper_transport_reset(void){ 307 crypto_active = 0; 308 if (incoming_unsegmented_pdu_raw){ 309 mesh_network_pdu_t * network_pdu = incoming_unsegmented_pdu_raw->segment; 310 btstack_assert(network_pdu != NULL); 311 incoming_unsegmented_pdu_raw->segment = NULL; 312 mesh_network_pdu_free(network_pdu); 313 incoming_unsegmented_pdu_raw = NULL; 314 } 315 outgoing_segmented_access_pdu = NULL; 316 mesh_upper_transport_reset_pdus(&upper_transport_incoming); 317 } 318 319 static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ 320 // get IV Index and IVI 321 uint32_t iv_index = mesh_get_iv_index(); 322 int ivi = ivi_nid >> 7; 323 324 // if least significant bit differs, use previous IV Index 325 if ((iv_index & 1 ) ^ ivi){ 326 iv_index--; 327 } 328 return iv_index; 329 } 330 331 static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 332 mesh_access_pdu_t * access_pdu; 333 mesh_upper_transport_pdu_t * upper_pdu; 334 switch (pdu->pdu_type){ 335 case MESH_PDU_TYPE_ACCESS: 336 access_pdu = (mesh_access_pdu_t *) pdu; 337 nonce[1] = access_pdu->transmic_len == 8 ? 0x80 : 0x00; 338 (void)memcpy(&nonce[2], &access_pdu->network_header[2], 7); 339 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(access_pdu->network_header[0])); 340 break; 341 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 342 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 343 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 344 nonce[1] = upper_pdu->transmic_len == 8 ? 0x80 : 0x00; 345 // 'network header' 346 big_endian_store_24(nonce, 2, upper_pdu->seq); 347 big_endian_store_16(nonce, 5, upper_pdu->src); 348 big_endian_store_16(nonce, 7, upper_pdu->dst); 349 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(upper_pdu->ivi_nid)); 350 break; 351 default: 352 btstack_assert(0); 353 break; 354 } 355 } 356 357 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 358 nonce[0] = 0x01; 359 transport_segmented_setup_nonce(nonce, pdu); 360 mesh_print_hex("AppNonce", nonce, 13); 361 } 362 363 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 364 nonce[0] = 0x02; 365 transport_segmented_setup_nonce(nonce, pdu); 366 mesh_print_hex("DeviceNonce", nonce, 13); 367 } 368 369 static void mesh_upper_transport_process_message_done(mesh_segmented_pdu_t *message_pdu){ 370 crypto_active = 0; 371 btstack_assert(message_pdu == &incoming_message_pdu_singleton); 372 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&incoming_message_pdu_singleton.segments); 373 if (mesh_network_control(network_pdu)) { 374 btstack_assert(0); 375 } else { 376 btstack_assert(network_pdu != NULL); 377 mesh_network_pdu_free(network_pdu); 378 mesh_pdu_t * pdu = (mesh_pdu_t *) incoming_unsegmented_pdu_raw; 379 incoming_unsegmented_pdu_raw = NULL; 380 mesh_lower_transport_message_processed_by_higher_layer(pdu); 381 } 382 mesh_upper_transport_run(); 383 } 384 385 static void mesh_upper_transport_process_unsegmented_message_done(mesh_pdu_t * pdu){ 386 btstack_assert(pdu != NULL); 387 btstack_assert(pdu->pdu_type == MESH_PDU_TYPE_UNSEGMENTED); 388 389 mesh_unsegmented_pdu_t * unsegmented_incoming_pdu = (mesh_unsegmented_pdu_t *) pdu; 390 btstack_assert(unsegmented_incoming_pdu == incoming_unsegmented_pdu_raw); 391 392 crypto_active = 0; 393 incoming_unsegmented_pdu_raw = NULL; 394 mesh_network_pdu_t * network_pdu = unsegmented_incoming_pdu->segment; 395 if (!mesh_network_control(network_pdu)) { 396 mesh_network_pdu_free(network_pdu); 397 } 398 399 mesh_lower_transport_message_processed_by_higher_layer(pdu); 400 mesh_upper_transport_run(); 401 } 402 403 static void mesh_upper_transport_process_access_message_done(mesh_access_pdu_t *access_pdu){ 404 crypto_active = 0; 405 btstack_assert(mesh_access_ctl(access_pdu) == 0); 406 incoming_access_pdu_encrypted = NULL; 407 mesh_upper_transport_run(); 408 } 409 410 static void mesh_upper_transport_process_control_message_done(mesh_control_pdu_t * control_pdu){ 411 crypto_active = 0; 412 incoming_control_pdu = NULL; 413 mesh_upper_transport_run(); 414 } 415 416 static void mesh_upper_transport_validate_segmented_message_ccm(void * arg){ 417 UNUSED(arg); 418 419 uint8_t * upper_transport_pdu = incoming_access_pdu_decrypted->data; 420 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 421 422 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 423 424 // store TransMIC 425 uint8_t trans_mic[8]; 426 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 427 mesh_print_hex("TransMIC", trans_mic, incoming_access_pdu_decrypted->transmic_len); 428 429 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], incoming_access_pdu_decrypted->transmic_len) == 0){ 430 printf("TransMIC matches\n"); 431 432 // remove TransMIC from payload 433 incoming_access_pdu_decrypted->len -= incoming_access_pdu_decrypted->transmic_len; 434 435 // if virtual address, update dst to pseudo_dst 436 if (mesh_network_address_virtual(mesh_access_dst(incoming_access_pdu_decrypted))){ 437 big_endian_store_16(incoming_access_pdu_decrypted->network_header, 7, mesh_transport_key_it.address->pseudo_dst); 438 } 439 440 // pass to upper layer 441 btstack_assert(mesh_access_message_handler != NULL); 442 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_access_pdu_decrypted; 443 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 444 445 printf("\n"); 446 447 } else { 448 uint8_t akf = incoming_access_pdu_decrypted->akf_aid_control & 0x40; 449 if (akf){ 450 printf("TransMIC does not match, try next key\n"); 451 mesh_upper_transport_validate_segmented_message(); 452 } else { 453 printf("TransMIC does not match device key, done\n"); 454 // done 455 mesh_upper_transport_process_access_message_done(incoming_access_pdu_decrypted); 456 } 457 } 458 } 459 460 static void mesh_upper_transport_validate_segmented_message_digest(void * arg){ 461 UNUSED(arg); 462 uint8_t upper_transport_pdu_len = incoming_access_pdu_encrypted->len - incoming_access_pdu_encrypted->transmic_len; 463 uint8_t * upper_transport_pdu_data_in = incoming_access_pdu_encrypted->data; 464 uint8_t * upper_transport_pdu_data_out = incoming_access_pdu_decrypted->data; 465 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); 466 } 467 468 static void mesh_upper_transport_validate_segmented_message(void){ 469 uint8_t * upper_transport_pdu_data = incoming_access_pdu_decrypted->data; 470 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 471 472 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 473 printf("No valid transport key found\n"); 474 mesh_upper_transport_process_access_message_done(incoming_access_pdu_decrypted); 475 return; 476 } 477 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 478 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 479 480 if (message_key->akf){ 481 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) incoming_access_pdu_encrypted); 482 } else { 483 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) incoming_access_pdu_encrypted); 484 } 485 486 // store application / device key index 487 mesh_print_hex("AppOrDevKey", message_key->key, 16); 488 incoming_access_pdu_decrypted->appkey_index = message_key->appkey_index; 489 490 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 491 492 // decrypt ccm 493 crypto_active = 1; 494 uint16_t aad_len = 0; 495 if (mesh_network_address_virtual(mesh_access_dst(incoming_access_pdu_decrypted))){ 496 aad_len = 16; 497 } 498 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, incoming_access_pdu_decrypted->transmic_len); 499 500 if (aad_len){ 501 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_segmented_message_digest, NULL); 502 } else { 503 mesh_upper_transport_validate_segmented_message_digest(NULL); 504 } 505 } 506 507 static void mesh_upper_transport_process_segmented_message(void){ 508 // copy original pdu 509 (void)memcpy(incoming_access_pdu_decrypted, incoming_access_pdu_encrypted, 510 sizeof(mesh_access_pdu_t)); 511 512 // 513 uint8_t * upper_transport_pdu = incoming_access_pdu_decrypted->data; 514 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 515 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 516 517 uint8_t aid = incoming_access_pdu_decrypted->akf_aid_control & 0x3f; 518 uint8_t akf = (incoming_access_pdu_decrypted->akf_aid_control & 0x40) >> 6; 519 520 printf("AKF: %u\n", akf); 521 printf("AID: %02x\n", aid); 522 523 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_access_dst(incoming_access_pdu_decrypted), 524 incoming_access_pdu_decrypted->netkey_index, akf, aid); 525 mesh_upper_transport_validate_segmented_message(); 526 } 527 528 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 529 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 530 mesh_upper_transport_run(); 531 } 532 533 static void mesh_upper_transport_send_segmented_pdu(mesh_access_pdu_t * access_pdu){ 534 outgoing_segmented_access_pdu = access_pdu; 535 mesh_segmented_pdu_t * message_pdu = &outgoing_segmented_message_singleton; 536 message_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 537 538 // convert mesh_access_pdu_t into mesh_segmented_pdu_t 539 mesh_segmented_append_payload(access_pdu->data, access_pdu->len, &message_pdu->segments); 540 541 // copy meta 542 message_pdu->len = access_pdu->len; 543 message_pdu->netkey_index = access_pdu->netkey_index; 544 message_pdu->transmic_len = access_pdu->transmic_len; 545 message_pdu->akf_aid_control = access_pdu->akf_aid_control; 546 message_pdu->flags = access_pdu->flags; 547 (void)memcpy(message_pdu->network_header, access_pdu->network_header, 9); 548 549 mesh_lower_transport_send_pdu((mesh_pdu_t*) message_pdu); 550 } 551 552 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, 553 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 554 555 if (control_pdu_len > 11) return 1; 556 557 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 558 if (!network_key) return 1; 559 560 uint8_t transport_pdu_data[12]; 561 transport_pdu_data[0] = opcode; 562 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 563 uint16_t transport_pdu_len = control_pdu_len + 1; 564 565 // setup network_pdu 566 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 567 568 return 0; 569 } 570 571 #if 0 572 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, 573 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 574 575 if (control_pdu_len > 256) return 1; 576 577 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 578 if (!network_key) return 1; 579 580 (void)memcpy(transport_pdu->data, control_pdu_data, control_pdu_len); 581 transport_pdu->len = control_pdu_len; 582 transport_pdu->netkey_index = netkey_index; 583 transport_pdu->akf_aid_control = opcode; 584 transport_pdu->transmic_len = 0; // no TransMIC for control 585 mesh_transport_set_nid_ivi(transport_pdu, network_key->nid); 586 mesh_transport_set_src(transport_pdu, src); 587 mesh_transport_set_dest(transport_pdu, dest); 588 mesh_transport_set_ctl_ttl(transport_pdu, 0x80 | ttl); 589 590 return 0; 591 } 592 #endif 593 594 uint8_t mesh_upper_transport_setup_control_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, 595 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 596 switch (pdu->pdu_type){ 597 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 598 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); 599 default: 600 btstack_assert(0); 601 return 1; 602 } 603 } 604 605 static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu_header(mesh_unsegmented_pdu_t * unsegmented_pdu, uint16_t netkey_index, 606 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest){ 607 608 mesh_network_pdu_t * network_pdu = unsegmented_pdu->segment; 609 610 // get app or device key 611 const mesh_transport_key_t * appkey; 612 appkey = mesh_transport_key_get(appkey_index); 613 if (appkey == NULL){ 614 printf("appkey_index %x unknown\n", appkey_index); 615 return 1; 616 } 617 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 618 619 // lookup network by netkey_index 620 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 621 if (!network_key) return 1; 622 623 unsegmented_pdu->appkey_index = appkey_index; 624 625 network_pdu->data[9] = akf_aid; 626 // setup network_pdu 627 mesh_network_setup_pdu_header(network_pdu, netkey_index, network_key->nid, 0, ttl, 0, src, dest); 628 return 0; 629 } 630 631 static uint8_t mesh_upper_transport_setup_segmented_access_pdu_header(mesh_access_pdu_t * access_pdu, uint16_t netkey_index, 632 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 633 634 // get app or device key 635 const mesh_transport_key_t *appkey; 636 appkey = mesh_transport_key_get(appkey_index); 637 if (appkey == NULL) { 638 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 639 return 1; 640 } 641 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 642 643 // lookup network by netkey_index 644 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 645 if (!network_key) return 1; 646 if (network_key == NULL) { 647 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 648 return 1; 649 } 650 651 const uint8_t trans_mic_len = szmic ? 8 : 4; 652 653 // store in transport pdu 654 access_pdu->transmic_len = trans_mic_len; 655 access_pdu->netkey_index = netkey_index; 656 access_pdu->appkey_index = appkey_index; 657 access_pdu->akf_aid_control = akf_aid; 658 mesh_access_set_nid_ivi(access_pdu, network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7)); 659 mesh_access_set_src(access_pdu, src); 660 mesh_access_set_dest(access_pdu, dest); 661 mesh_access_set_ctl_ttl(access_pdu, ttl); 662 return 0; 663 } 664 665 static uint8_t mesh_upper_transport_setup_upper_access_pdu_header(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, 666 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 667 668 // get app or device key 669 const mesh_transport_key_t *appkey; 670 appkey = mesh_transport_key_get(appkey_index); 671 if (appkey == NULL) { 672 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 673 return 1; 674 } 675 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 676 677 // lookup network by netkey_index 678 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 679 if (!network_key) return 1; 680 if (network_key == NULL) { 681 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 682 return 1; 683 } 684 685 const uint8_t trans_mic_len = szmic ? 8 : 4; 686 687 // store in transport pdu 688 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 689 upper_pdu->ctl_ttl = ttl; 690 upper_pdu->src = src; 691 upper_pdu->dst = dest; 692 upper_pdu->transmic_len = trans_mic_len; 693 upper_pdu->netkey_index = netkey_index; 694 upper_pdu->appkey_index = appkey_index; 695 upper_pdu->akf_aid_control = akf_aid; 696 return 0; 697 } 698 699 static uint8_t mesh_upper_transport_setup_upper_access_pdu(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, 700 uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 701 int status = mesh_upper_transport_setup_upper_access_pdu_header(upper_pdu, netkey_index, appkey_index, ttl, src, 702 dest, szmic); 703 if (status) return status; 704 705 // store in transport pdu 706 uint16_t offset = 0; 707 mesh_segmented_append_payload(access_pdu_data, access_pdu_len, &upper_pdu->segments); 708 upper_pdu->len = access_pdu_len; 709 return 0; 710 } 711 712 713 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 714 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 715 switch (pdu->pdu_type){ 716 case MESH_PDU_TYPE_ACCESS: 717 return mesh_upper_transport_setup_segmented_access_pdu_header((mesh_access_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 718 case MESH_PDU_TYPE_UNSEGMENTED: 719 return mesh_upper_transport_setup_unsegmented_access_pdu_header((mesh_unsegmented_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest); 720 default: 721 btstack_assert(false); 722 return 1; 723 } 724 } 725 726 uint8_t mesh_upper_transport_setup_access_pdu(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 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 729 switch (pdu->pdu_type){ 730 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 731 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 732 return mesh_upper_transport_setup_upper_access_pdu((mesh_upper_transport_pdu_t *) pdu, netkey_index, 733 appkey_index, ttl, src, dest, szmic, access_pdu_data, 734 access_pdu_len); 735 default: 736 btstack_assert(false); 737 return 1; 738 } 739 } 740 741 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 742 // Device Key is fixed 743 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 744 return mesh_transport_key_get(appkey_index); 745 } 746 747 // Get key refresh state from subnet 748 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 749 if (subnet == NULL) return NULL; 750 751 // identify old and new app keys for given appkey_index 752 mesh_transport_key_t * old_key = NULL; 753 mesh_transport_key_t * new_key = NULL; 754 mesh_transport_key_iterator_t it; 755 mesh_transport_key_iterator_init(&it, netkey_index); 756 while (mesh_transport_key_iterator_has_more(&it)){ 757 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 758 if (transport_key->appkey_index != appkey_index) continue; 759 if (transport_key->old_key == 0) { 760 new_key = transport_key; 761 } else { 762 old_key = transport_key; 763 } 764 } 765 766 // if no key is marked as old, just use the current one 767 if (old_key == NULL) return new_key; 768 769 // use new key if it exists in phase two 770 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 771 return new_key; 772 } else { 773 return old_key; 774 } 775 } 776 777 static void mesh_upper_transport_send_upper_segmented_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 778 779 // TODO: store upper pdu in outgoing pdus active or similar 780 outgoing_upper_transport_pdu = upper_pdu; 781 782 mesh_segmented_pdu_t * message_pdu = &outgoing_segmented_message_singleton; 783 message_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 784 785 // convert mesh_access_pdu_t into mesh_segmented_pdu_t 786 mesh_segmented_append_payload(crypto_buffer, upper_pdu->len, &message_pdu->segments); 787 788 // copy meta 789 message_pdu->len = upper_pdu->len; 790 message_pdu->netkey_index = upper_pdu->netkey_index; 791 message_pdu->transmic_len = upper_pdu->transmic_len; 792 message_pdu->akf_aid_control = upper_pdu->akf_aid_control; 793 message_pdu->flags = upper_pdu->flags; 794 795 // setup message_pdu header 796 // (void)memcpy(message_pdu->network_header, upper_pdu->network_header, 9); 797 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 798 message_pdu->network_header[0] = upper_pdu->ivi_nid; 799 message_pdu->network_header[1] = upper_pdu->ctl_ttl; 800 big_endian_store_24(message_pdu->network_header, 2, upper_pdu->seq); 801 big_endian_store_16(message_pdu->network_header, 5, upper_pdu->src); 802 big_endian_store_16(message_pdu->network_header, 7, upper_pdu->dst); 803 804 mesh_lower_transport_send_pdu((mesh_pdu_t*) message_pdu); 805 } 806 807 static void mesh_upper_transport_send_upper_unsegmented_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 808 809 // TODO: store upper pdu in outgoing pdus active or similar 810 outgoing_upper_transport_pdu = upper_pdu; 811 812 mesh_unsegmented_pdu_t * unsegmented_pdu = &outgoing_unsegmented_pdu_singleton; 813 unsegmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UNSEGMENTED; 814 815 // provide segment 816 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 817 btstack_assert(network_pdu); 818 unsegmented_pdu->segment = network_pdu; 819 820 // setup network pdu 821 network_pdu->data[0] = upper_pdu->ivi_nid; 822 network_pdu->data[1] = upper_pdu->ctl_ttl; 823 big_endian_store_24(network_pdu->data, 2, upper_pdu->seq); 824 big_endian_store_16(network_pdu->data, 5, upper_pdu->src); 825 big_endian_store_16(network_pdu->data, 7, upper_pdu->dst); 826 network_pdu->netkey_index = upper_pdu->netkey_index; 827 828 // setup acess message 829 network_pdu->data[9] = upper_pdu->akf_aid_control; 830 btstack_assert(upper_pdu->len < 15); 831 (void)memcpy(&network_pdu->data[10], crypto_buffer, upper_pdu->len); 832 network_pdu->len = 10 + upper_pdu->len; 833 network_pdu->flags = 0; 834 835 mesh_lower_transport_send_pdu((mesh_pdu_t*) unsegmented_pdu); 836 } 837 838 static void mesh_upper_transport_send_upper_access_pdu_ccm(void * arg){ 839 crypto_active = 0; 840 841 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 842 mesh_print_hex("EncAccessPayload", crypto_buffer, upper_pdu->len); 843 // store TransMIC 844 btstack_crypto_ccm_get_authentication_value(&ccm, &crypto_buffer[upper_pdu->len]); 845 mesh_print_hex("TransMIC", &crypto_buffer[upper_pdu->len], upper_pdu->transmic_len); 846 upper_pdu->len += upper_pdu->transmic_len; 847 mesh_print_hex("UpperTransportPDU", crypto_buffer, upper_pdu->len); 848 switch (upper_pdu->pdu_header.pdu_type){ 849 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 850 mesh_upper_transport_send_upper_unsegmented_pdu(upper_pdu); 851 break; 852 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 853 mesh_upper_transport_send_upper_segmented_pdu(upper_pdu); 854 break; 855 default: 856 btstack_assert(false); 857 } 858 } 859 860 static void mesh_upper_transport_send_upper_access_pdu_digest(void *arg){ 861 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 862 uint16_t access_pdu_len = upper_pdu->len; 863 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, crypto_buffer, crypto_buffer, 864 &mesh_upper_transport_send_upper_access_pdu_ccm, upper_pdu); 865 } 866 867 static void mesh_upper_transport_send_upper_access_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 868 869 // if dst is virtual address, lookup label uuid and hash 870 uint16_t aad_len = 0; 871 mesh_virtual_address_t * virtual_address = NULL; 872 if (mesh_network_address_virtual(upper_pdu->dst)){ 873 virtual_address = mesh_virtual_address_for_pseudo_dst(upper_pdu->dst); 874 if (!virtual_address){ 875 printf("No virtual address register for pseudo dst %4x\n", upper_pdu->dst); 876 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 877 return; 878 } 879 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 880 // printf_hexdump(virtual_address->label_uuid, 16); 881 aad_len = 16; 882 upper_pdu->dst = virtual_address->hash; 883 } 884 885 // get app or device key 886 uint16_t appkey_index = upper_pdu->appkey_index; 887 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(upper_pdu->netkey_index, appkey_index); 888 if (appkey == NULL){ 889 printf("AppKey %04x not found, drop message\n", appkey_index); 890 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 891 return; 892 } 893 894 // reserve slot 895 mesh_lower_transport_reserve_slot(); 896 897 // reserve one sequence number, which is also used to encrypt access payload 898 uint32_t seq = mesh_sequence_number_next(); 899 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 900 upper_pdu->seq = seq; 901 902 // also reserves crypto_buffer 903 crypto_active = 1; 904 905 // flatten segmented pdu into crypto buffer 906 uint16_t payload_len = mesh_upper_pdu_flatten(upper_pdu, crypto_buffer, sizeof(crypto_buffer)); 907 btstack_assert(payload_len == upper_pdu->len); 908 909 // Dump PDU 910 printf("[+] Upper transport, send upper (un)segmented Access PDU - dest %04x, seq %06x\n", upper_pdu->dst, upper_pdu->seq); 911 mesh_print_hex("Access Payload", crypto_buffer, upper_pdu->len); 912 913 // setup nonce - uses dst, so after pseudo address translation 914 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 915 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 916 } else { 917 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 918 } 919 920 // Dump key 921 mesh_print_hex("AppOrDevKey", appkey->key, 16); 922 923 // encrypt ccm 924 uint8_t transmic_len = upper_pdu->transmic_len; 925 uint16_t access_pdu_len = upper_pdu->len; 926 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 927 if (virtual_address){ 928 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 929 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, 930 &mesh_upper_transport_send_upper_access_pdu_digest, upper_pdu); 931 } else { 932 mesh_upper_transport_send_upper_access_pdu_digest(upper_pdu); 933 } 934 } 935 936 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 937 // reserve slot 938 mesh_lower_transport_reserve_slot(); 939 // reserve sequence number 940 uint32_t seq = mesh_sequence_number_next(); 941 mesh_network_pdu_set_seq(network_pdu, seq); 942 // Dump PDU 943 uint8_t opcode = network_pdu->data[9]; 944 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 945 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 946 // wrap into mesh-unsegmented-pdu 947 outgoing_unsegmented_pdu_singleton.pdu_header.pdu_type = MESH_PDU_TYPE_UNSEGMENTED; 948 outgoing_unsegmented_pdu_singleton.segment = network_pdu; 949 outgoing_unsegmented_pdu_singleton.flags = MESH_TRANSPORT_FLAG_CONTROL; 950 951 // send 952 mesh_lower_transport_send_pdu((mesh_pdu_t *) &outgoing_unsegmented_pdu_singleton); 953 } 954 955 #if 0 956 static void mesh_upper_transport_send_segmented_control_pdu(mesh_transport_pdu_t * transport_pdu){ 957 // reserve slot 958 mesh_lower_transport_reserve_slot(); 959 // reserve sequence number 960 uint32_t seq = mesh_sequence_number_next(); 961 transport_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 962 mesh_transport_set_seq(transport_pdu, seq); 963 // Dump PDU 964 uint8_t opcode = transport_pdu->data[0]; 965 printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", transport_pdu, seq, opcode); 966 mesh_print_hex("Access Payload", &transport_pdu->data[1], transport_pdu->len - 1); 967 // send 968 btstack_assert(false); 969 // mesh_upper_transport_send_segmented_pdu(transport_pdu); 970 } 971 #endif 972 973 static void mesh_upper_transport_run(void){ 974 975 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 976 977 if (crypto_active) return; 978 979 // get next message 980 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(&upper_transport_incoming); 981 mesh_network_pdu_t * network_pdu; 982 mesh_segmented_pdu_t * message_pdu; 983 mesh_unsegmented_pdu_t * unsegmented_pdu; 984 switch (pdu->pdu_type){ 985 case MESH_PDU_TYPE_UNSEGMENTED: 986 unsegmented_pdu = (mesh_unsegmented_pdu_t *) pdu; 987 network_pdu = unsegmented_pdu->segment; 988 btstack_assert(network_pdu != NULL); 989 // control? 990 if (mesh_network_control(network_pdu)) { 991 992 incoming_control_pdu = &incoming_control_pdu_singleton; 993 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 994 incoming_control_pdu->len = network_pdu->len; 995 incoming_control_pdu->netkey_index = network_pdu->netkey_index; 996 997 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 998 999 incoming_control_pdu->akf_aid_control = lower_transport_pdu[0]; 1000 incoming_control_pdu->len = network_pdu->len - 10; // 9 header + 1 opcode 1001 (void)memcpy(incoming_control_pdu->data, &lower_transport_pdu[1], incoming_control_pdu->len); 1002 1003 // copy meta data into encrypted pdu buffer 1004 (void)memcpy(incoming_control_pdu->network_header, network_pdu->data, 9); 1005 1006 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 1007 1008 // free mesh message 1009 mesh_lower_transport_message_processed_by_higher_layer(pdu); 1010 1011 btstack_assert(mesh_control_message_handler != NULL); 1012 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 1013 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 1014 1015 } else { 1016 1017 incoming_access_pdu_encrypted = &incoming_access_pdu_encrypted_singleton; 1018 incoming_access_pdu_encrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 1019 incoming_access_pdu_decrypted = &incoming_access_pdu_decrypted_singleton; 1020 1021 incoming_access_pdu_encrypted->netkey_index = network_pdu->netkey_index; 1022 incoming_access_pdu_encrypted->transmic_len = 4; 1023 1024 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 1025 1026 incoming_access_pdu_encrypted->akf_aid_control = lower_transport_pdu[0]; 1027 incoming_access_pdu_encrypted->len = network_pdu->len - 10; // 9 header + 1 AID 1028 (void)memcpy(incoming_access_pdu_encrypted->data, &lower_transport_pdu[1], incoming_access_pdu_encrypted->len); 1029 1030 // copy meta data into encrypted pdu buffer 1031 (void)memcpy(incoming_access_pdu_encrypted->network_header, network_pdu->data, 9); 1032 1033 mesh_print_hex("Assembled payload", incoming_access_pdu_encrypted->data, incoming_access_pdu_encrypted->len); 1034 1035 // free mesh message 1036 mesh_lower_transport_message_processed_by_higher_layer(pdu); 1037 1038 // get encoded transport pdu and start processing 1039 mesh_upper_transport_process_segmented_message(); 1040 } 1041 break; 1042 case MESH_PDU_TYPE_SEGMENTED: 1043 message_pdu = (mesh_segmented_pdu_t *) pdu; 1044 uint8_t ctl = mesh_message_ctl(message_pdu); 1045 if (ctl){ 1046 incoming_control_pdu= &incoming_control_pdu_singleton; 1047 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 1048 1049 // flatten 1050 mesh_segmented_pdu_flatten(&message_pdu->segments, 8, incoming_control_pdu->data); 1051 1052 // copy meta data into encrypted pdu buffer 1053 incoming_control_pdu->len = message_pdu->len; 1054 incoming_control_pdu->netkey_index = message_pdu->netkey_index; 1055 incoming_control_pdu->akf_aid_control = message_pdu->akf_aid_control; 1056 incoming_control_pdu->flags = 0; 1057 (void)memcpy(incoming_control_pdu->network_header, message_pdu->network_header, 9); 1058 1059 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 1060 1061 // free mesh message 1062 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 1063 1064 btstack_assert(mesh_control_message_handler != NULL); 1065 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 1066 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 1067 1068 } else { 1069 1070 incoming_access_pdu_encrypted = &incoming_access_pdu_encrypted_singleton; 1071 incoming_access_pdu_encrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 1072 incoming_access_pdu_decrypted = &incoming_access_pdu_decrypted_singleton; 1073 1074 // flatten 1075 mesh_segmented_pdu_flatten(&message_pdu->segments, 12, incoming_access_pdu_encrypted->data); 1076 1077 // copy meta data into encrypted pdu buffer 1078 incoming_access_pdu_encrypted->len = message_pdu->len; 1079 incoming_access_pdu_encrypted->netkey_index = message_pdu->netkey_index; 1080 incoming_access_pdu_encrypted->transmic_len = message_pdu->transmic_len; 1081 incoming_access_pdu_encrypted->akf_aid_control = message_pdu->akf_aid_control; 1082 (void)memcpy(incoming_access_pdu_encrypted->network_header, message_pdu->network_header, 9); 1083 1084 mesh_print_hex("Assembled payload", incoming_access_pdu_encrypted->data, incoming_access_pdu_encrypted->len); 1085 1086 // free mesh message 1087 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 1088 1089 // get encoded transport pdu and start processing 1090 mesh_upper_transport_process_segmented_message(); 1091 } 1092 break; 1093 default: 1094 btstack_assert(0); 1095 break; 1096 } 1097 } 1098 1099 while (!btstack_linked_list_empty(&upper_transport_outgoing)){ 1100 1101 if (crypto_active) break; 1102 1103 if (outgoing_segmented_access_pdu != NULL) break; 1104 1105 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_outgoing); 1106 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == 0) break; 1107 1108 (void) btstack_linked_list_pop(&upper_transport_outgoing); 1109 1110 mesh_unsegmented_pdu_t * unsegmented_pdu; 1111 1112 switch (pdu->pdu_type){ 1113 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1114 btstack_assert(mesh_pdu_ctl(pdu) != 0); 1115 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 1116 break; 1117 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1118 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1119 mesh_upper_transport_send_upper_access_pdu((mesh_upper_transport_pdu_t *) pdu); 1120 break; 1121 default: 1122 btstack_assert(false); 1123 break; 1124 } 1125 } 1126 } 1127 1128 1129 1130 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 1131 mesh_pdu_t * pdu_to_report; 1132 mesh_unsegmented_pdu_t * unsegmented_pdu; 1133 switch (callback_type){ 1134 case MESH_TRANSPORT_PDU_RECEIVED: 1135 mesh_upper_transport_message_received(pdu); 1136 break; 1137 case MESH_TRANSPORT_PDU_SENT: 1138 switch (pdu->pdu_type){ 1139 case MESH_PDU_TYPE_SEGMENTED: 1140 // free chunks 1141 while (!btstack_linked_list_empty(&outgoing_segmented_message_singleton.segments)){ 1142 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&outgoing_segmented_message_singleton.segments); 1143 mesh_network_pdu_free(network_pdu); 1144 } 1145 // notify upper layer but use transport pdu 1146 pdu_to_report = (mesh_pdu_t *) outgoing_segmented_access_pdu; 1147 outgoing_segmented_access_pdu = NULL; 1148 if (mesh_pdu_ctl(pdu_to_report)){ 1149 mesh_control_message_handler(callback_type, status, pdu_to_report); 1150 } else { 1151 mesh_access_message_handler(callback_type, status, pdu_to_report); 1152 } 1153 break; 1154 case MESH_PDU_TYPE_UNSEGMENTED: 1155 unsegmented_pdu = (mesh_unsegmented_pdu_t *) pdu; 1156 if (unsegmented_pdu == &outgoing_unsegmented_pdu_singleton){ 1157 if ((unsegmented_pdu->flags & MESH_TRANSPORT_FLAG_CONTROL) == 0){ 1158 // notify upper layer but use network pdu (control pdu) 1159 mesh_network_pdu_t * network_pdu = outgoing_unsegmented_pdu_singleton.segment; 1160 outgoing_unsegmented_pdu_singleton.segment = NULL; 1161 mesh_control_message_handler(callback_type, status, (mesh_pdu_t *) network_pdu); 1162 } else { 1163 // notify upper layer but use upper access pdu 1164 mesh_network_pdu_t * network_pdu = outgoing_unsegmented_pdu_singleton.segment; 1165 outgoing_unsegmented_pdu_singleton.segment = NULL; 1166 mesh_network_pdu_free(network_pdu); 1167 pdu_to_report = (mesh_pdu_t *) outgoing_upper_transport_pdu; 1168 mesh_access_message_handler(callback_type, status, pdu_to_report); 1169 } 1170 } else { 1171 btstack_assert((unsegmented_pdu->flags & MESH_TRANSPORT_FLAG_CONTROL) == 0); 1172 mesh_access_message_handler(callback_type, status, pdu); 1173 } 1174 break; 1175 default: 1176 btstack_assert(false); 1177 break; 1178 } 1179 mesh_upper_transport_run(); 1180 break; 1181 default: 1182 break; 1183 } 1184 } 1185 1186 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 1187 mesh_network_pdu_t * network_pdu; 1188 mesh_segmented_pdu_t * message_pdu; 1189 switch (pdu->pdu_type) { 1190 case MESH_PDU_TYPE_NETWORK: 1191 network_pdu = (mesh_network_pdu_t *) pdu; 1192 mesh_network_pdu_free(network_pdu); 1193 break; 1194 case MESH_PDU_TYPE_SEGMENTED: 1195 message_pdu = (mesh_segmented_pdu_t *) pdu; 1196 mesh_message_pdu_free(message_pdu); 1197 default: 1198 btstack_assert(false); 1199 break; 1200 } 1201 } 1202 1203 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 1204 crypto_active = 0; 1205 switch (pdu->pdu_type){ 1206 case MESH_PDU_TYPE_ACCESS: 1207 mesh_upper_transport_process_access_message_done((mesh_access_pdu_t *) pdu); 1208 case MESH_PDU_TYPE_CONTROL: 1209 mesh_upper_transport_process_control_message_done((mesh_control_pdu_t *) pdu); 1210 break; 1211 default: 1212 btstack_assert(0); 1213 break; 1214 } 1215 } 1216 1217 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)) { 1218 mesh_access_message_handler = callback; 1219 } 1220 1221 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)){ 1222 mesh_control_message_handler = callback; 1223 } 1224 1225 void mesh_upper_transport_init(){ 1226 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1227 } 1228