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_pdu_singleton; 93 static mesh_upper_transport_pdu_t * outgoing_upper_transport_pdu; 94 95 static uint8_t application_nonce[13]; 96 static btstack_crypto_ccm_t ccm; 97 static uint8_t crypto_buffer[MESH_ACCESS_PAYLOAD_MAX]; 98 static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; 99 100 // upper transport callbacks - in access layer 101 static void (*mesh_access_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 102 static void (*mesh_control_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 103 104 // incoming unsegmented (network) and segmented (transport) control and access messages 105 static btstack_linked_list_t upper_transport_incoming; 106 107 // outgoing unsegmented (network) and segmented (uppert_transport_outgoing) control and access messages 108 static btstack_linked_list_t upper_transport_outgoing; 109 110 111 // TODO: higher layer define used for assert 112 #define MESH_ACCESS_OPCODE_NOT_SET 0xFFFFFFFEu 113 114 static void mesh_print_hex(const char * name, const uint8_t * data, uint16_t len){ 115 printf("%-20s ", name); 116 printf_hexdump(data, len); 117 } 118 // static void mesh_print_x(const char * name, uint32_t value){ 119 // printf("%20s: 0x%x", name, (int) value); 120 // } 121 122 static void mesh_transport_key_and_virtual_address_iterator_init(mesh_transport_key_and_virtual_address_iterator_t *it, 123 uint16_t dst, uint16_t netkey_index, uint8_t akf, 124 uint8_t aid) { 125 printf("KEY_INIT: dst %04x, akf %x, aid %x\n", dst, akf, aid); 126 // config 127 it->dst = dst; 128 // init elements 129 it->key = NULL; 130 it->address = NULL; 131 // init element iterators 132 mesh_transport_key_aid_iterator_init(&it->key_it, netkey_index, akf, aid); 133 // init address iterator 134 if (mesh_network_address_virtual(it->dst)){ 135 mesh_virtual_address_iterator_init(&it->address_it, dst); 136 // get first key 137 if (mesh_transport_key_aid_iterator_has_more(&it->key_it)) { 138 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 139 } 140 } 141 } 142 143 // cartesian product: keys x addressses 144 static int mesh_transport_key_and_virtual_address_iterator_has_more(mesh_transport_key_and_virtual_address_iterator_t * it){ 145 if (mesh_network_address_virtual(it->dst)) { 146 // find next valid entry 147 while (true){ 148 if (mesh_virtual_address_iterator_has_more(&it->address_it)) return 1; 149 if (!mesh_transport_key_aid_iterator_has_more(&it->key_it)) return 0; 150 // get next key 151 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 152 mesh_virtual_address_iterator_init(&it->address_it, it->dst); 153 } 154 } else { 155 return mesh_transport_key_aid_iterator_has_more(&it->key_it); 156 } 157 } 158 159 static void mesh_transport_key_and_virtual_address_iterator_next(mesh_transport_key_and_virtual_address_iterator_t * it){ 160 if (mesh_network_address_virtual(it->dst)) { 161 it->address = mesh_virtual_address_iterator_get_next(&it->address_it); 162 } else { 163 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 164 } 165 } 166 167 // UPPER TRANSPORT 168 169 uint16_t mesh_access_dst(mesh_access_pdu_t * access_pdu){ 170 return big_endian_read_16(access_pdu->network_header, 7); 171 } 172 173 uint16_t mesh_access_ctl(mesh_access_pdu_t * access_pdu){ 174 return access_pdu->network_header[1] >> 7; 175 } 176 177 uint32_t mesh_access_seq(mesh_access_pdu_t * access_pdu){ 178 return big_endian_read_24(access_pdu->network_header, 2); 179 } 180 181 void mesh_access_set_nid_ivi(mesh_access_pdu_t * access_pdu, uint8_t nid_ivi){ 182 access_pdu->network_header[0] = nid_ivi; 183 } 184 void mesh_access_set_ctl_ttl(mesh_access_pdu_t * access_pdu, uint8_t ctl_ttl){ 185 access_pdu->network_header[1] = ctl_ttl; 186 } 187 void mesh_access_set_seq(mesh_access_pdu_t * access_pdu, uint32_t seq){ 188 big_endian_store_24(access_pdu->network_header, 2, seq); 189 } 190 void mesh_access_set_src(mesh_access_pdu_t * access_pdu, uint16_t src){ 191 big_endian_store_16(access_pdu->network_header, 5, src); 192 } 193 void mesh_access_set_dest(mesh_access_pdu_t * access_pdu, uint16_t dest){ 194 big_endian_store_16(access_pdu->network_header, 7, dest); 195 } 196 197 static void mesh_segmented_pdu_flatten(btstack_linked_list_t * segments, uint8_t segment_len, uint8_t * buffer) { 198 // assemble payload 199 btstack_linked_list_iterator_t it; 200 btstack_linked_list_iterator_init(&it, segments); 201 while (btstack_linked_list_iterator_has_next(&it)) { 202 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 203 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 204 // get segment n 205 uint8_t *lower_transport_pdu = mesh_network_pdu_data(segment); 206 uint8_t seg_o = (big_endian_read_16(lower_transport_pdu, 2) >> 5) & 0x001f; 207 uint8_t *segment_data = &lower_transport_pdu[4]; 208 (void) memcpy(&buffer[seg_o * segment_len], segment_data, segment_len); 209 } 210 } 211 212 static uint16_t mesh_upper_pdu_flatten(mesh_upper_transport_pdu_t * upper_pdu, uint8_t * buffer, uint16_t buffer_len) { 213 // assemble payload 214 btstack_linked_list_iterator_t it; 215 btstack_linked_list_iterator_init(&it, &upper_pdu->segments); 216 uint16_t offset = 0; 217 while (btstack_linked_list_iterator_has_next(&it)) { 218 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 219 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 220 btstack_assert((offset + segment->len) <= buffer_len); 221 (void) memcpy(&buffer[offset], segment->data, segment->len); 222 offset += segment->len; 223 } 224 return offset; 225 } 226 227 static void mesh_segmented_append_payload(const uint8_t * payload, uint16_t payload_len, btstack_linked_list_t * segments){ 228 uint16_t payload_offset = 0; 229 uint16_t bytes_current_segment = 0; 230 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_last_item(segments); 231 if (network_pdu){ 232 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX - network_pdu->len; 233 } 234 while (payload_offset < payload_len){ 235 if (bytes_current_segment == 0){ 236 network_pdu = mesh_network_pdu_get(); 237 btstack_assert(network_pdu != NULL); 238 btstack_linked_list_add_tail(segments, (btstack_linked_item_t *) network_pdu); 239 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX; 240 } 241 uint16_t bytes_to_copy = btstack_min(bytes_current_segment, payload_len - payload_offset); 242 (void) memcpy(&network_pdu->data[network_pdu->len], &payload[payload_offset], bytes_to_copy); 243 bytes_current_segment -= bytes_to_copy; 244 network_pdu->len += bytes_to_copy; 245 payload_offset += bytes_to_copy; 246 } 247 } 248 249 // stub lower transport 250 251 static void mesh_upper_transport_dump_pdus(const char *name, btstack_linked_list_t *list){ 252 printf("List: %s:\n", name); 253 btstack_linked_list_iterator_t it; 254 btstack_linked_list_iterator_init(&it, list); 255 while (btstack_linked_list_iterator_has_next(&it)){ 256 mesh_pdu_t * pdu = (mesh_pdu_t*) btstack_linked_list_iterator_next(&it); 257 printf("- %p\n", pdu); 258 // printf_hexdump( mesh_pdu_data(pdu), mesh_pdu_len(pdu)); 259 } 260 } 261 262 static void mesh_upper_transport_reset_pdus(btstack_linked_list_t *list){ 263 while (!btstack_linked_list_empty(list)){ 264 mesh_upper_transport_pdu_free((mesh_pdu_t *) btstack_linked_list_pop(list)); 265 } 266 } 267 268 void mesh_upper_transport_dump(void){ 269 printf("incoming_unsegmented_pdu_raw: %p\n", incoming_unsegmented_pdu_raw); 270 mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); 271 } 272 273 void mesh_upper_transport_reset(void){ 274 crypto_active = 0; 275 if (incoming_unsegmented_pdu_raw){ 276 mesh_network_pdu_t * network_pdu = incoming_unsegmented_pdu_raw->segment; 277 btstack_assert(network_pdu != NULL); 278 incoming_unsegmented_pdu_raw->segment = NULL; 279 mesh_network_pdu_free(network_pdu); 280 incoming_unsegmented_pdu_raw = NULL; 281 } 282 outgoing_upper_transport_pdu = NULL; 283 mesh_upper_transport_reset_pdus(&upper_transport_incoming); 284 } 285 286 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 287 // Device Key is fixed 288 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 289 return mesh_transport_key_get(appkey_index); 290 } 291 292 // Get key refresh state from subnet 293 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 294 if (subnet == NULL) return NULL; 295 296 // identify old and new app keys for given appkey_index 297 mesh_transport_key_t * old_key = NULL; 298 mesh_transport_key_t * new_key = NULL; 299 mesh_transport_key_iterator_t it; 300 mesh_transport_key_iterator_init(&it, netkey_index); 301 while (mesh_transport_key_iterator_has_more(&it)){ 302 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 303 if (transport_key->appkey_index != appkey_index) continue; 304 if (transport_key->old_key == 0) { 305 new_key = transport_key; 306 } else { 307 old_key = transport_key; 308 } 309 } 310 311 // if no key is marked as old, just use the current one 312 if (old_key == NULL) return new_key; 313 314 // use new key if it exists in phase two 315 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 316 return new_key; 317 } else { 318 return old_key; 319 } 320 } 321 322 static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ 323 // get IV Index and IVI 324 uint32_t iv_index = mesh_get_iv_index(); 325 int ivi = ivi_nid >> 7; 326 327 // if least significant bit differs, use previous IV Index 328 if ((iv_index & 1 ) ^ ivi){ 329 iv_index--; 330 } 331 return iv_index; 332 } 333 334 static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 335 mesh_access_pdu_t * access_pdu; 336 mesh_upper_transport_pdu_t * upper_pdu; 337 switch (pdu->pdu_type){ 338 case MESH_PDU_TYPE_ACCESS: 339 access_pdu = (mesh_access_pdu_t *) pdu; 340 nonce[1] = access_pdu->transmic_len == 8 ? 0x80 : 0x00; 341 (void)memcpy(&nonce[2], &access_pdu->network_header[2], 7); 342 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(access_pdu->network_header[0])); 343 break; 344 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 345 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 346 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 347 nonce[1] = upper_pdu->transmic_len == 8 ? 0x80 : 0x00; 348 // 'network header' 349 big_endian_store_24(nonce, 2, upper_pdu->seq); 350 big_endian_store_16(nonce, 5, upper_pdu->src); 351 big_endian_store_16(nonce, 7, upper_pdu->dst); 352 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(upper_pdu->ivi_nid)); 353 break; 354 default: 355 btstack_assert(0); 356 break; 357 } 358 } 359 360 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 361 nonce[0] = 0x01; 362 transport_segmented_setup_nonce(nonce, pdu); 363 mesh_print_hex("AppNonce", nonce, 13); 364 } 365 366 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 367 nonce[0] = 0x02; 368 transport_segmented_setup_nonce(nonce, pdu); 369 mesh_print_hex("DeviceNonce", nonce, 13); 370 } 371 372 static void mesh_upper_transport_process_message_done(mesh_segmented_pdu_t *message_pdu){ 373 crypto_active = 0; 374 btstack_assert(message_pdu == &incoming_message_pdu_singleton); 375 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&incoming_message_pdu_singleton.segments); 376 if (mesh_network_control(network_pdu)) { 377 btstack_assert(0); 378 } else { 379 btstack_assert(network_pdu != NULL); 380 mesh_network_pdu_free(network_pdu); 381 mesh_pdu_t * pdu = (mesh_pdu_t *) incoming_unsegmented_pdu_raw; 382 incoming_unsegmented_pdu_raw = NULL; 383 mesh_lower_transport_message_processed_by_higher_layer(pdu); 384 } 385 mesh_upper_transport_run(); 386 } 387 388 static void mesh_upper_transport_process_unsegmented_message_done(mesh_pdu_t * pdu){ 389 btstack_assert(pdu != NULL); 390 btstack_assert(pdu->pdu_type == MESH_PDU_TYPE_UNSEGMENTED); 391 392 mesh_unsegmented_pdu_t * unsegmented_incoming_pdu = (mesh_unsegmented_pdu_t *) pdu; 393 btstack_assert(unsegmented_incoming_pdu == incoming_unsegmented_pdu_raw); 394 395 crypto_active = 0; 396 incoming_unsegmented_pdu_raw = NULL; 397 mesh_network_pdu_t * network_pdu = unsegmented_incoming_pdu->segment; 398 if (!mesh_network_control(network_pdu)) { 399 mesh_network_pdu_free(network_pdu); 400 } 401 402 mesh_lower_transport_message_processed_by_higher_layer(pdu); 403 mesh_upper_transport_run(); 404 } 405 406 static void mesh_upper_transport_process_access_message_done(mesh_access_pdu_t *access_pdu){ 407 crypto_active = 0; 408 btstack_assert(mesh_access_ctl(access_pdu) == 0); 409 incoming_access_pdu_encrypted = NULL; 410 mesh_upper_transport_run(); 411 } 412 413 static void mesh_upper_transport_process_control_message_done(mesh_control_pdu_t * control_pdu){ 414 crypto_active = 0; 415 incoming_control_pdu = NULL; 416 mesh_upper_transport_run(); 417 } 418 419 static void mesh_upper_transport_validate_segmented_message_ccm(void * arg){ 420 UNUSED(arg); 421 422 uint8_t * upper_transport_pdu = incoming_access_pdu_decrypted->data; 423 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 424 425 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 426 427 // store TransMIC 428 uint8_t trans_mic[8]; 429 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 430 mesh_print_hex("TransMIC", trans_mic, incoming_access_pdu_decrypted->transmic_len); 431 432 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], incoming_access_pdu_decrypted->transmic_len) == 0){ 433 printf("TransMIC matches\n"); 434 435 // remove TransMIC from payload 436 incoming_access_pdu_decrypted->len -= incoming_access_pdu_decrypted->transmic_len; 437 438 // if virtual address, update dst to pseudo_dst 439 if (mesh_network_address_virtual(mesh_access_dst(incoming_access_pdu_decrypted))){ 440 big_endian_store_16(incoming_access_pdu_decrypted->network_header, 7, mesh_transport_key_it.address->pseudo_dst); 441 } 442 443 // pass to upper layer 444 btstack_assert(mesh_access_message_handler != NULL); 445 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_access_pdu_decrypted; 446 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 447 448 printf("\n"); 449 450 } else { 451 uint8_t akf = incoming_access_pdu_decrypted->akf_aid_control & 0x40; 452 if (akf){ 453 printf("TransMIC does not match, try next key\n"); 454 mesh_upper_transport_validate_segmented_message(); 455 } else { 456 printf("TransMIC does not match device key, done\n"); 457 // done 458 mesh_upper_transport_process_access_message_done(incoming_access_pdu_decrypted); 459 } 460 } 461 } 462 463 static void mesh_upper_transport_validate_segmented_message_digest(void * arg){ 464 UNUSED(arg); 465 uint8_t upper_transport_pdu_len = incoming_access_pdu_encrypted->len - incoming_access_pdu_encrypted->transmic_len; 466 uint8_t * upper_transport_pdu_data_in = incoming_access_pdu_encrypted->data; 467 uint8_t * upper_transport_pdu_data_out = incoming_access_pdu_decrypted->data; 468 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); 469 } 470 471 static void mesh_upper_transport_validate_segmented_message(void){ 472 uint8_t * upper_transport_pdu_data = incoming_access_pdu_decrypted->data; 473 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 474 475 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 476 printf("No valid transport key found\n"); 477 mesh_upper_transport_process_access_message_done(incoming_access_pdu_decrypted); 478 return; 479 } 480 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 481 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 482 483 if (message_key->akf){ 484 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) incoming_access_pdu_encrypted); 485 } else { 486 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) incoming_access_pdu_encrypted); 487 } 488 489 // store application / device key index 490 mesh_print_hex("AppOrDevKey", message_key->key, 16); 491 incoming_access_pdu_decrypted->appkey_index = message_key->appkey_index; 492 493 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 494 495 // decrypt ccm 496 crypto_active = 1; 497 uint16_t aad_len = 0; 498 if (mesh_network_address_virtual(mesh_access_dst(incoming_access_pdu_decrypted))){ 499 aad_len = 16; 500 } 501 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, incoming_access_pdu_decrypted->transmic_len); 502 503 if (aad_len){ 504 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_segmented_message_digest, NULL); 505 } else { 506 mesh_upper_transport_validate_segmented_message_digest(NULL); 507 } 508 } 509 510 static void mesh_upper_transport_process_segmented_message(void){ 511 // copy original pdu 512 (void)memcpy(incoming_access_pdu_decrypted, incoming_access_pdu_encrypted, 513 sizeof(mesh_access_pdu_t)); 514 515 // 516 uint8_t * upper_transport_pdu = incoming_access_pdu_decrypted->data; 517 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 518 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 519 520 uint8_t aid = incoming_access_pdu_decrypted->akf_aid_control & 0x3f; 521 uint8_t akf = (incoming_access_pdu_decrypted->akf_aid_control & 0x40) >> 6; 522 523 printf("AKF: %u\n", akf); 524 printf("AID: %02x\n", aid); 525 526 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_access_dst(incoming_access_pdu_decrypted), 527 incoming_access_pdu_decrypted->netkey_index, akf, aid); 528 mesh_upper_transport_validate_segmented_message(); 529 } 530 531 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 532 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 533 mesh_upper_transport_run(); 534 } 535 536 static void mesh_upper_transport_send_access_segmented(mesh_upper_transport_pdu_t * upper_pdu){ 537 538 // TODO: store upper pdu in outgoing pdus active or similar 539 outgoing_upper_transport_pdu = upper_pdu; 540 541 mesh_segmented_pdu_t * message_pdu = &outgoing_segmented_pdu_singleton; 542 message_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 543 544 // convert mesh_access_pdu_t into mesh_segmented_pdu_t 545 mesh_segmented_append_payload(crypto_buffer, upper_pdu->len, &message_pdu->segments); 546 547 // copy meta 548 message_pdu->len = upper_pdu->len; 549 message_pdu->netkey_index = upper_pdu->netkey_index; 550 message_pdu->transmic_len = upper_pdu->transmic_len; 551 message_pdu->akf_aid_control = upper_pdu->akf_aid_control; 552 message_pdu->flags = upper_pdu->flags; 553 554 // setup message_pdu header 555 // (void)memcpy(message_pdu->network_header, upper_pdu->network_header, 9); 556 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 557 message_pdu->network_header[0] = upper_pdu->ivi_nid; 558 message_pdu->network_header[1] = upper_pdu->ctl_ttl; 559 big_endian_store_24(message_pdu->network_header, 2, upper_pdu->seq); 560 big_endian_store_16(message_pdu->network_header, 5, upper_pdu->src); 561 big_endian_store_16(message_pdu->network_header, 7, upper_pdu->dst); 562 563 mesh_lower_transport_send_pdu((mesh_pdu_t*) message_pdu); 564 } 565 566 static void mesh_upper_transport_send_access_unsegmented(mesh_upper_transport_pdu_t * upper_pdu){ 567 568 // TODO: store upper pdu in outgoing pdus active or similar 569 outgoing_upper_transport_pdu = upper_pdu; 570 571 // provide segment 572 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 573 btstack_assert(network_pdu); 574 575 // setup network pdu 576 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS; 577 network_pdu->data[0] = upper_pdu->ivi_nid; 578 network_pdu->data[1] = upper_pdu->ctl_ttl; 579 big_endian_store_24(network_pdu->data, 2, upper_pdu->seq); 580 big_endian_store_16(network_pdu->data, 5, upper_pdu->src); 581 big_endian_store_16(network_pdu->data, 7, upper_pdu->dst); 582 network_pdu->netkey_index = upper_pdu->netkey_index; 583 584 // setup access message 585 network_pdu->data[9] = upper_pdu->akf_aid_control; 586 btstack_assert(upper_pdu->len < 15); 587 (void)memcpy(&network_pdu->data[10], crypto_buffer, upper_pdu->len); 588 network_pdu->len = 10 + upper_pdu->len; 589 network_pdu->flags = 0; 590 591 mesh_lower_transport_send_pdu((mesh_pdu_t*) network_pdu); 592 } 593 594 static void mesh_upper_transport_send_access_ccm(void * arg){ 595 crypto_active = 0; 596 597 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 598 mesh_print_hex("EncAccessPayload", crypto_buffer, upper_pdu->len); 599 // store TransMIC 600 btstack_crypto_ccm_get_authentication_value(&ccm, &crypto_buffer[upper_pdu->len]); 601 mesh_print_hex("TransMIC", &crypto_buffer[upper_pdu->len], upper_pdu->transmic_len); 602 upper_pdu->len += upper_pdu->transmic_len; 603 mesh_print_hex("UpperTransportPDU", crypto_buffer, upper_pdu->len); 604 switch (upper_pdu->pdu_header.pdu_type){ 605 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 606 mesh_upper_transport_send_access_unsegmented(upper_pdu); 607 break; 608 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 609 mesh_upper_transport_send_access_segmented(upper_pdu); 610 break; 611 default: 612 btstack_assert(false); 613 } 614 } 615 616 static void mesh_upper_transport_send_access_digest(void *arg){ 617 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 618 uint16_t access_pdu_len = upper_pdu->len; 619 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, crypto_buffer, crypto_buffer, 620 &mesh_upper_transport_send_access_ccm, upper_pdu); 621 } 622 623 static void mesh_upper_transport_send_access(mesh_upper_transport_pdu_t * upper_pdu){ 624 625 // if dst is virtual address, lookup label uuid and hash 626 uint16_t aad_len = 0; 627 mesh_virtual_address_t * virtual_address = NULL; 628 if (mesh_network_address_virtual(upper_pdu->dst)){ 629 virtual_address = mesh_virtual_address_for_pseudo_dst(upper_pdu->dst); 630 if (!virtual_address){ 631 printf("No virtual address register for pseudo dst %4x\n", upper_pdu->dst); 632 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 633 return; 634 } 635 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 636 // printf_hexdump(virtual_address->label_uuid, 16); 637 aad_len = 16; 638 upper_pdu->dst = virtual_address->hash; 639 } 640 641 // get app or device key 642 uint16_t appkey_index = upper_pdu->appkey_index; 643 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(upper_pdu->netkey_index, appkey_index); 644 if (appkey == NULL){ 645 printf("AppKey %04x not found, drop message\n", appkey_index); 646 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 647 return; 648 } 649 650 // reserve slot 651 mesh_lower_transport_reserve_slot(); 652 653 // reserve one sequence number, which is also used to encrypt access payload 654 uint32_t seq = mesh_sequence_number_next(); 655 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 656 upper_pdu->seq = seq; 657 658 // also reserves crypto_buffer 659 crypto_active = 1; 660 661 // flatten segmented pdu into crypto buffer 662 uint16_t payload_len = mesh_upper_pdu_flatten(upper_pdu, crypto_buffer, sizeof(crypto_buffer)); 663 btstack_assert(payload_len == upper_pdu->len); 664 665 // Dump PDU 666 printf("[+] Upper transport, send upper (un)segmented Access PDU - dest %04x, seq %06x\n", upper_pdu->dst, upper_pdu->seq); 667 mesh_print_hex("Access Payload", crypto_buffer, upper_pdu->len); 668 669 // setup nonce - uses dst, so after pseudo address translation 670 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 671 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 672 } else { 673 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 674 } 675 676 // Dump key 677 mesh_print_hex("AppOrDevKey", appkey->key, 16); 678 679 // encrypt ccm 680 uint8_t transmic_len = upper_pdu->transmic_len; 681 uint16_t access_pdu_len = upper_pdu->len; 682 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 683 if (virtual_address){ 684 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 685 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, 686 &mesh_upper_transport_send_access_digest, upper_pdu); 687 } else { 688 mesh_upper_transport_send_access_digest(upper_pdu); 689 } 690 } 691 692 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 693 // reserve slot 694 mesh_lower_transport_reserve_slot(); 695 // reserve sequence number 696 uint32_t seq = mesh_sequence_number_next(); 697 mesh_network_pdu_set_seq(network_pdu, seq); 698 // Dump PDU 699 uint8_t opcode = network_pdu->data[9]; 700 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 701 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 702 703 // send 704 mesh_lower_transport_send_pdu((mesh_pdu_t *) network_pdu); 705 } 706 707 static void mesh_upper_transport_send_segmented_control_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 708 // reserve slot 709 mesh_lower_transport_reserve_slot(); 710 // reserve sequence number 711 uint32_t seq = mesh_sequence_number_next(); 712 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 713 upper_pdu->seq = seq; 714 // Dump PDU 715 // uint8_t opcode = upper_pdu->data[0]; 716 // printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", upper_pdu, seq, opcode); 717 // mesh_print_hex("Access Payload", &upper_pdu->data[1], upper_pdu->len - 1); 718 // send 719 outgoing_upper_transport_pdu = upper_pdu; 720 mesh_segmented_pdu_t *messagePdu = &outgoing_segmented_pdu_singleton; 721 messagePdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 722 723 // lend segments to lower transport pdu 724 messagePdu->segments = upper_pdu->segments; 725 upper_pdu->segments = NULL; 726 727 // copy meta 728 messagePdu->len = upper_pdu->len; 729 messagePdu->netkey_index = upper_pdu->netkey_index; 730 messagePdu->transmic_len = 0; // no TransMIC for control 731 messagePdu->akf_aid_control = upper_pdu->akf_aid_control; 732 messagePdu->flags = upper_pdu->flags; 733 734 // setup message_pdu header 735 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 736 messagePdu->network_header[0] = upper_pdu->ivi_nid; 737 messagePdu->network_header[1] = upper_pdu->ctl_ttl; 738 big_endian_store_24(messagePdu->network_header, 2, upper_pdu->seq); 739 big_endian_store_16(messagePdu->network_header, 5, upper_pdu->src); 740 big_endian_store_16(messagePdu->network_header, 7, upper_pdu->dst); 741 742 mesh_lower_transport_send_pdu((mesh_pdu_t *) messagePdu); 743 } 744 745 static void mesh_upper_transport_run(void){ 746 747 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 748 749 if (crypto_active) return; 750 751 // get next message 752 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(&upper_transport_incoming); 753 mesh_network_pdu_t * network_pdu; 754 mesh_segmented_pdu_t * message_pdu; 755 mesh_unsegmented_pdu_t * unsegmented_pdu; 756 switch (pdu->pdu_type){ 757 case MESH_PDU_TYPE_UNSEGMENTED: 758 unsegmented_pdu = (mesh_unsegmented_pdu_t *) pdu; 759 network_pdu = unsegmented_pdu->segment; 760 btstack_assert(network_pdu != NULL); 761 // control? 762 if (mesh_network_control(network_pdu)) { 763 764 incoming_control_pdu = &incoming_control_pdu_singleton; 765 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 766 incoming_control_pdu->len = network_pdu->len; 767 incoming_control_pdu->netkey_index = network_pdu->netkey_index; 768 769 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 770 771 incoming_control_pdu->akf_aid_control = lower_transport_pdu[0]; 772 incoming_control_pdu->len = network_pdu->len - 10; // 9 header + 1 opcode 773 (void)memcpy(incoming_control_pdu->data, &lower_transport_pdu[1], incoming_control_pdu->len); 774 775 // copy meta data into encrypted pdu buffer 776 (void)memcpy(incoming_control_pdu->network_header, network_pdu->data, 9); 777 778 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 779 780 // free mesh message 781 mesh_lower_transport_message_processed_by_higher_layer(pdu); 782 783 btstack_assert(mesh_control_message_handler != NULL); 784 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 785 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 786 787 } else { 788 789 incoming_access_pdu_encrypted = &incoming_access_pdu_encrypted_singleton; 790 incoming_access_pdu_encrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 791 incoming_access_pdu_decrypted = &incoming_access_pdu_decrypted_singleton; 792 793 incoming_access_pdu_encrypted->netkey_index = network_pdu->netkey_index; 794 incoming_access_pdu_encrypted->transmic_len = 4; 795 796 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 797 798 incoming_access_pdu_encrypted->akf_aid_control = lower_transport_pdu[0]; 799 incoming_access_pdu_encrypted->len = network_pdu->len - 10; // 9 header + 1 AID 800 (void)memcpy(incoming_access_pdu_encrypted->data, &lower_transport_pdu[1], incoming_access_pdu_encrypted->len); 801 802 // copy meta data into encrypted pdu buffer 803 (void)memcpy(incoming_access_pdu_encrypted->network_header, network_pdu->data, 9); 804 805 mesh_print_hex("Assembled payload", incoming_access_pdu_encrypted->data, incoming_access_pdu_encrypted->len); 806 807 // free mesh message 808 mesh_lower_transport_message_processed_by_higher_layer(pdu); 809 810 // get encoded transport pdu and start processing 811 mesh_upper_transport_process_segmented_message(); 812 } 813 break; 814 case MESH_PDU_TYPE_SEGMENTED: 815 message_pdu = (mesh_segmented_pdu_t *) pdu; 816 uint8_t ctl = mesh_message_ctl(message_pdu); 817 if (ctl){ 818 incoming_control_pdu= &incoming_control_pdu_singleton; 819 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 820 821 // flatten 822 mesh_segmented_pdu_flatten(&message_pdu->segments, 8, incoming_control_pdu->data); 823 824 // copy meta data into encrypted pdu buffer 825 incoming_control_pdu->len = message_pdu->len; 826 incoming_control_pdu->netkey_index = message_pdu->netkey_index; 827 incoming_control_pdu->akf_aid_control = message_pdu->akf_aid_control; 828 incoming_control_pdu->flags = 0; 829 (void)memcpy(incoming_control_pdu->network_header, message_pdu->network_header, 9); 830 831 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 832 833 // free mesh message 834 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 835 836 btstack_assert(mesh_control_message_handler != NULL); 837 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 838 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 839 840 } else { 841 842 incoming_access_pdu_encrypted = &incoming_access_pdu_encrypted_singleton; 843 incoming_access_pdu_encrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 844 incoming_access_pdu_decrypted = &incoming_access_pdu_decrypted_singleton; 845 846 // flatten 847 mesh_segmented_pdu_flatten(&message_pdu->segments, 12, incoming_access_pdu_encrypted->data); 848 849 // copy meta data into encrypted pdu buffer 850 incoming_access_pdu_encrypted->len = message_pdu->len; 851 incoming_access_pdu_encrypted->netkey_index = message_pdu->netkey_index; 852 incoming_access_pdu_encrypted->transmic_len = message_pdu->transmic_len; 853 incoming_access_pdu_encrypted->akf_aid_control = message_pdu->akf_aid_control; 854 (void)memcpy(incoming_access_pdu_encrypted->network_header, message_pdu->network_header, 9); 855 856 mesh_print_hex("Assembled payload", incoming_access_pdu_encrypted->data, incoming_access_pdu_encrypted->len); 857 858 // free mesh message 859 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 860 861 // get encoded transport pdu and start processing 862 mesh_upper_transport_process_segmented_message(); 863 } 864 break; 865 default: 866 btstack_assert(0); 867 break; 868 } 869 } 870 871 while (!btstack_linked_list_empty(&upper_transport_outgoing)){ 872 873 if (crypto_active) break; 874 875 if (outgoing_upper_transport_pdu != NULL) break; 876 877 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_outgoing); 878 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == 0) break; 879 880 (void) btstack_linked_list_pop(&upper_transport_outgoing); 881 882 883 switch (pdu->pdu_type){ 884 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 885 btstack_assert(mesh_pdu_ctl(pdu) != 0); 886 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 887 break; 888 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 889 mesh_upper_transport_send_segmented_control_pdu((mesh_upper_transport_pdu_t *) pdu); 890 break; 891 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 892 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 893 mesh_upper_transport_send_access((mesh_upper_transport_pdu_t *) pdu); 894 break; 895 default: 896 btstack_assert(false); 897 break; 898 } 899 } 900 } 901 902 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 903 mesh_pdu_t * pdu_to_report; 904 mesh_upper_transport_pdu_t * upper_pdu; 905 switch (callback_type){ 906 case MESH_TRANSPORT_PDU_RECEIVED: 907 mesh_upper_transport_message_received(pdu); 908 break; 909 case MESH_TRANSPORT_PDU_SENT: 910 switch (pdu->pdu_type){ 911 case MESH_PDU_TYPE_SEGMENTED: 912 // free chunks 913 while (!btstack_linked_list_empty(&outgoing_segmented_pdu_singleton.segments)){ 914 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&outgoing_segmented_pdu_singleton.segments); 915 mesh_network_pdu_free(network_pdu); 916 } 917 // notify upper layer but use transport pdu 918 pdu_to_report = (mesh_pdu_t *) outgoing_upper_transport_pdu; 919 outgoing_upper_transport_pdu = NULL; 920 if (mesh_pdu_ctl(pdu_to_report)){ 921 mesh_control_message_handler(callback_type, status, pdu_to_report); 922 } else { 923 mesh_access_message_handler(callback_type, status, pdu_to_report); 924 } 925 break; 926 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 927 upper_pdu = outgoing_upper_transport_pdu; 928 outgoing_upper_transport_pdu = NULL; 929 mesh_access_message_handler(callback_type, status, (mesh_pdu_t*) upper_pdu); 930 break; 931 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 932 mesh_access_message_handler(callback_type, status, pdu); 933 break; 934 default: 935 btstack_assert(false); 936 break; 937 } 938 mesh_upper_transport_run(); 939 break; 940 default: 941 break; 942 } 943 } 944 945 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 946 mesh_network_pdu_t * network_pdu; 947 mesh_segmented_pdu_t * message_pdu; 948 switch (pdu->pdu_type) { 949 case MESH_PDU_TYPE_NETWORK: 950 network_pdu = (mesh_network_pdu_t *) pdu; 951 mesh_network_pdu_free(network_pdu); 952 break; 953 case MESH_PDU_TYPE_SEGMENTED: 954 message_pdu = (mesh_segmented_pdu_t *) pdu; 955 mesh_message_pdu_free(message_pdu); 956 default: 957 btstack_assert(false); 958 break; 959 } 960 } 961 962 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 963 crypto_active = 0; 964 switch (pdu->pdu_type){ 965 case MESH_PDU_TYPE_ACCESS: 966 mesh_upper_transport_process_access_message_done((mesh_access_pdu_t *) pdu); 967 case MESH_PDU_TYPE_CONTROL: 968 mesh_upper_transport_process_control_message_done((mesh_control_pdu_t *) pdu); 969 break; 970 default: 971 btstack_assert(0); 972 break; 973 } 974 } 975 976 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 977 switch (pdu->pdu_type){ 978 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 979 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 980 break; 981 default: 982 btstack_assert(false); 983 break; 984 } 985 986 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 987 mesh_upper_transport_run(); 988 } 989 990 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 991 switch (pdu->pdu_type){ 992 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 993 break; 994 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 995 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 996 break; 997 default: 998 btstack_assert(false); 999 break; 1000 } 1001 1002 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1003 mesh_upper_transport_run(); 1004 } 1005 1006 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, 1007 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1008 1009 if (control_pdu_len > 11) return 1; 1010 1011 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1012 if (!network_key) return 1; 1013 1014 uint8_t transport_pdu_data[12]; 1015 transport_pdu_data[0] = opcode; 1016 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 1017 uint16_t transport_pdu_len = control_pdu_len + 1; 1018 1019 // setup network_pdu 1020 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 1021 1022 return 0; 1023 } 1024 1025 static uint8_t mesh_upper_transport_setup_segmented_control_pdu(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, 1026 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1027 1028 if (control_pdu_len > 256) return 1; 1029 1030 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1031 if (!network_key) return 1; 1032 1033 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1034 upper_pdu->ctl_ttl = ttl; 1035 upper_pdu->src = src; 1036 upper_pdu->dst = dest; 1037 upper_pdu->transmic_len = 0; // no TransMIC for control 1038 upper_pdu->netkey_index = netkey_index; 1039 upper_pdu->akf_aid_control = opcode; 1040 1041 mesh_segmented_append_payload(control_pdu_data, control_pdu_len, &upper_pdu->segments); 1042 upper_pdu->len = control_pdu_len; 1043 return 0; 1044 } 1045 1046 uint8_t mesh_upper_transport_setup_control_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, 1047 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1048 switch (pdu->pdu_type){ 1049 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1050 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); 1051 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1052 return mesh_upper_transport_setup_segmented_control_pdu((mesh_upper_transport_pdu_t *) pdu, netkey_index, ttl, src, dest, opcode, control_pdu_data, control_pdu_len); 1053 default: 1054 btstack_assert(0); 1055 return 1; 1056 } 1057 } 1058 1059 static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu_header(mesh_unsegmented_pdu_t * unsegmented_pdu, uint16_t netkey_index, 1060 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest){ 1061 1062 mesh_network_pdu_t * network_pdu = unsegmented_pdu->segment; 1063 1064 // get app or device key 1065 const mesh_transport_key_t * appkey; 1066 appkey = mesh_transport_key_get(appkey_index); 1067 if (appkey == NULL){ 1068 printf("appkey_index %x unknown\n", appkey_index); 1069 return 1; 1070 } 1071 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1072 1073 // lookup network by netkey_index 1074 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1075 if (!network_key) return 1; 1076 1077 unsegmented_pdu->appkey_index = appkey_index; 1078 1079 network_pdu->data[9] = akf_aid; 1080 // setup network_pdu 1081 mesh_network_setup_pdu_header(network_pdu, netkey_index, network_key->nid, 0, ttl, 0, src, dest); 1082 return 0; 1083 } 1084 1085 static uint8_t mesh_upper_transport_setup_segmented_access_pdu_header(mesh_access_pdu_t * access_pdu, uint16_t netkey_index, 1086 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1087 1088 // get app or device key 1089 const mesh_transport_key_t *appkey; 1090 appkey = mesh_transport_key_get(appkey_index); 1091 if (appkey == NULL) { 1092 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 1093 return 1; 1094 } 1095 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1096 1097 // lookup network by netkey_index 1098 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 1099 if (!network_key) return 1; 1100 if (network_key == NULL) { 1101 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 1102 return 1; 1103 } 1104 1105 const uint8_t trans_mic_len = szmic ? 8 : 4; 1106 1107 // store in transport pdu 1108 access_pdu->transmic_len = trans_mic_len; 1109 access_pdu->netkey_index = netkey_index; 1110 access_pdu->appkey_index = appkey_index; 1111 access_pdu->akf_aid_control = akf_aid; 1112 mesh_access_set_nid_ivi(access_pdu, network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7)); 1113 mesh_access_set_src(access_pdu, src); 1114 mesh_access_set_dest(access_pdu, dest); 1115 mesh_access_set_ctl_ttl(access_pdu, ttl); 1116 return 0; 1117 } 1118 1119 static uint8_t mesh_upper_transport_setup_upper_access_pdu_header(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, 1120 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1121 1122 // get app or device key 1123 const mesh_transport_key_t *appkey; 1124 appkey = mesh_transport_key_get(appkey_index); 1125 if (appkey == NULL) { 1126 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 1127 return 1; 1128 } 1129 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1130 1131 // lookup network by netkey_index 1132 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 1133 if (!network_key) return 1; 1134 if (network_key == NULL) { 1135 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 1136 return 1; 1137 } 1138 1139 const uint8_t trans_mic_len = szmic ? 8 : 4; 1140 1141 // store in transport pdu 1142 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1143 upper_pdu->ctl_ttl = ttl; 1144 upper_pdu->src = src; 1145 upper_pdu->dst = dest; 1146 upper_pdu->transmic_len = trans_mic_len; 1147 upper_pdu->netkey_index = netkey_index; 1148 upper_pdu->appkey_index = appkey_index; 1149 upper_pdu->akf_aid_control = akf_aid; 1150 return 0; 1151 } 1152 1153 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, 1154 uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 1155 int status = mesh_upper_transport_setup_upper_access_pdu_header(upper_pdu, netkey_index, appkey_index, ttl, src, 1156 dest, szmic); 1157 if (status) return status; 1158 1159 // store in transport pdu 1160 mesh_segmented_append_payload(access_pdu_data, access_pdu_len, &upper_pdu->segments); 1161 upper_pdu->len = access_pdu_len; 1162 return 0; 1163 } 1164 1165 1166 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 1167 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1168 switch (pdu->pdu_type){ 1169 case MESH_PDU_TYPE_ACCESS: 1170 return mesh_upper_transport_setup_segmented_access_pdu_header((mesh_access_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 1171 case MESH_PDU_TYPE_UNSEGMENTED: 1172 return mesh_upper_transport_setup_unsegmented_access_pdu_header((mesh_unsegmented_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest); 1173 default: 1174 btstack_assert(false); 1175 return 1; 1176 } 1177 } 1178 1179 uint8_t mesh_upper_transport_setup_access_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 1180 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic, 1181 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 1182 switch (pdu->pdu_type){ 1183 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1184 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1185 return mesh_upper_transport_setup_upper_access_pdu((mesh_upper_transport_pdu_t *) pdu, netkey_index, 1186 appkey_index, ttl, src, dest, szmic, access_pdu_data, 1187 access_pdu_len); 1188 default: 1189 btstack_assert(false); 1190 return 1; 1191 } 1192 } 1193 1194 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)) { 1195 mesh_access_message_handler = callback; 1196 } 1197 1198 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)){ 1199 mesh_control_message_handler = callback; 1200 } 1201 1202 void mesh_upper_transport_init(){ 1203 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1204 } 1205