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 // upper transport callbacks - in access layer 78 static void (*mesh_access_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 79 static void (*mesh_control_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 80 81 // 82 static int crypto_active; 83 static uint8_t application_nonce[13]; 84 static btstack_crypto_ccm_t ccm; 85 static uint8_t crypto_buffer[MESH_ACCESS_PAYLOAD_MAX]; 86 87 static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; 88 89 static mesh_access_pdu_t * incoming_access_pdu_encrypted; 90 static mesh_access_pdu_t * incoming_access_pdu_decrypted; 91 92 static mesh_access_pdu_t incoming_access_pdu_encrypted_singleton; 93 static mesh_access_pdu_t incoming_access_pdu_decrypted_singleton; 94 95 static mesh_control_pdu_t incoming_control_pdu_singleton; 96 static mesh_control_pdu_t * incoming_control_pdu; 97 98 static mesh_segmented_pdu_t outgoing_segmented_pdu_singleton; 99 100 static mesh_segmented_pdu_t * upper_transport_outgoing_segmented; 101 102 // incoming unsegmented (network) and segmented (transport) control and access messages 103 static btstack_linked_list_t upper_transport_incoming; 104 105 // outgoing unsegmented and segmented control and access messages 106 static btstack_linked_list_t upper_transport_outgoing; 107 108 // outgoing upper transport messages that have been sent to lower transport and wait for sent event 109 static btstack_linked_list_t upper_transport_outgoing_active; 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 mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); 270 } 271 272 void mesh_upper_transport_reset(void){ 273 crypto_active = 0; 274 mesh_upper_transport_reset_pdus(&upper_transport_incoming); 275 } 276 277 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 278 // Device Key is fixed 279 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 280 return mesh_transport_key_get(appkey_index); 281 } 282 283 // Get key refresh state from subnet 284 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 285 if (subnet == NULL) return NULL; 286 287 // identify old and new app keys for given appkey_index 288 mesh_transport_key_t * old_key = NULL; 289 mesh_transport_key_t * new_key = NULL; 290 mesh_transport_key_iterator_t it; 291 mesh_transport_key_iterator_init(&it, netkey_index); 292 while (mesh_transport_key_iterator_has_more(&it)){ 293 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 294 if (transport_key->appkey_index != appkey_index) continue; 295 if (transport_key->old_key == 0) { 296 new_key = transport_key; 297 } else { 298 old_key = transport_key; 299 } 300 } 301 302 // if no key is marked as old, just use the current one 303 if (old_key == NULL) return new_key; 304 305 // use new key if it exists in phase two 306 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 307 return new_key; 308 } else { 309 return old_key; 310 } 311 } 312 313 static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ 314 // get IV Index and IVI 315 uint32_t iv_index = mesh_get_iv_index(); 316 int ivi = ivi_nid >> 7; 317 318 // if least significant bit differs, use previous IV Index 319 if ((iv_index & 1 ) ^ ivi){ 320 iv_index--; 321 } 322 return iv_index; 323 } 324 325 static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 326 mesh_access_pdu_t * access_pdu; 327 mesh_upper_transport_pdu_t * upper_pdu; 328 switch (pdu->pdu_type){ 329 case MESH_PDU_TYPE_ACCESS: 330 access_pdu = (mesh_access_pdu_t *) pdu; 331 nonce[1] = access_pdu->transmic_len == 8 ? 0x80 : 0x00; 332 (void)memcpy(&nonce[2], &access_pdu->network_header[2], 7); 333 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(access_pdu->network_header[0])); 334 break; 335 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 336 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 337 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 338 nonce[1] = upper_pdu->transmic_len == 8 ? 0x80 : 0x00; 339 // 'network header' 340 big_endian_store_24(nonce, 2, upper_pdu->seq); 341 big_endian_store_16(nonce, 5, upper_pdu->src); 342 big_endian_store_16(nonce, 7, upper_pdu->dst); 343 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(upper_pdu->ivi_nid)); 344 break; 345 default: 346 btstack_assert(0); 347 break; 348 } 349 } 350 351 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 352 nonce[0] = 0x01; 353 transport_segmented_setup_nonce(nonce, pdu); 354 mesh_print_hex("AppNonce", nonce, 13); 355 } 356 357 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 358 nonce[0] = 0x02; 359 transport_segmented_setup_nonce(nonce, pdu); 360 mesh_print_hex("DeviceNonce", nonce, 13); 361 } 362 363 static void mesh_upper_transport_process_access_message_done(mesh_access_pdu_t *access_pdu){ 364 crypto_active = 0; 365 btstack_assert(mesh_access_ctl(access_pdu) == 0); 366 incoming_access_pdu_encrypted = NULL; 367 mesh_upper_transport_run(); 368 } 369 370 static void mesh_upper_transport_process_control_message_done(mesh_control_pdu_t * control_pdu){ 371 crypto_active = 0; 372 incoming_control_pdu = NULL; 373 mesh_upper_transport_run(); 374 } 375 376 static void mesh_upper_transport_validate_segmented_message_ccm(void * arg){ 377 UNUSED(arg); 378 379 uint8_t * upper_transport_pdu = incoming_access_pdu_decrypted->data; 380 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 381 382 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 383 384 // store TransMIC 385 uint8_t trans_mic[8]; 386 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 387 mesh_print_hex("TransMIC", trans_mic, incoming_access_pdu_decrypted->transmic_len); 388 389 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], incoming_access_pdu_decrypted->transmic_len) == 0){ 390 printf("TransMIC matches\n"); 391 392 // remove TransMIC from payload 393 incoming_access_pdu_decrypted->len -= incoming_access_pdu_decrypted->transmic_len; 394 395 // if virtual address, update dst to pseudo_dst 396 if (mesh_network_address_virtual(mesh_access_dst(incoming_access_pdu_decrypted))){ 397 big_endian_store_16(incoming_access_pdu_decrypted->network_header, 7, mesh_transport_key_it.address->pseudo_dst); 398 } 399 400 // pass to upper layer 401 btstack_assert(mesh_access_message_handler != NULL); 402 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_access_pdu_decrypted; 403 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 404 405 printf("\n"); 406 407 } else { 408 uint8_t akf = incoming_access_pdu_decrypted->akf_aid_control & 0x40; 409 if (akf){ 410 printf("TransMIC does not match, try next key\n"); 411 mesh_upper_transport_validate_segmented_message(); 412 } else { 413 printf("TransMIC does not match device key, done\n"); 414 // done 415 mesh_upper_transport_process_access_message_done(incoming_access_pdu_decrypted); 416 } 417 } 418 } 419 420 static void mesh_upper_transport_validate_segmented_message_digest(void * arg){ 421 UNUSED(arg); 422 uint8_t upper_transport_pdu_len = incoming_access_pdu_encrypted->len - incoming_access_pdu_encrypted->transmic_len; 423 uint8_t * upper_transport_pdu_data_in = incoming_access_pdu_encrypted->data; 424 uint8_t * upper_transport_pdu_data_out = incoming_access_pdu_decrypted->data; 425 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_in, upper_transport_pdu_data_out, &mesh_upper_transport_validate_segmented_message_ccm, NULL); 426 } 427 428 static void mesh_upper_transport_validate_segmented_message(void){ 429 uint8_t * upper_transport_pdu_data = incoming_access_pdu_decrypted->data; 430 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 431 432 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 433 printf("No valid transport key found\n"); 434 mesh_upper_transport_process_access_message_done(incoming_access_pdu_decrypted); 435 return; 436 } 437 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 438 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 439 440 if (message_key->akf){ 441 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) incoming_access_pdu_encrypted); 442 } else { 443 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) incoming_access_pdu_encrypted); 444 } 445 446 // store application / device key index 447 mesh_print_hex("AppOrDevKey", message_key->key, 16); 448 incoming_access_pdu_decrypted->appkey_index = message_key->appkey_index; 449 450 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 451 452 // decrypt ccm 453 crypto_active = 1; 454 uint16_t aad_len = 0; 455 if (mesh_network_address_virtual(mesh_access_dst(incoming_access_pdu_decrypted))){ 456 aad_len = 16; 457 } 458 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, incoming_access_pdu_decrypted->transmic_len); 459 460 if (aad_len){ 461 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_segmented_message_digest, NULL); 462 } else { 463 mesh_upper_transport_validate_segmented_message_digest(NULL); 464 } 465 } 466 467 static void mesh_upper_transport_process_segmented_message(void){ 468 // copy original pdu 469 (void)memcpy(incoming_access_pdu_decrypted, incoming_access_pdu_encrypted, 470 sizeof(mesh_access_pdu_t)); 471 472 // 473 uint8_t * upper_transport_pdu = incoming_access_pdu_decrypted->data; 474 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 475 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 476 477 uint8_t aid = incoming_access_pdu_decrypted->akf_aid_control & 0x3f; 478 uint8_t akf = (incoming_access_pdu_decrypted->akf_aid_control & 0x40) >> 6; 479 480 printf("AKF: %u\n", akf); 481 printf("AID: %02x\n", aid); 482 483 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_access_dst(incoming_access_pdu_decrypted), 484 incoming_access_pdu_decrypted->netkey_index, akf, aid); 485 mesh_upper_transport_validate_segmented_message(); 486 } 487 488 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 489 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 490 mesh_upper_transport_run(); 491 } 492 493 static void mesh_upper_transport_send_access_segmented(mesh_upper_transport_pdu_t * upper_pdu){ 494 495 mesh_segmented_pdu_t * message_pdu = &outgoing_segmented_pdu_singleton; 496 message_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 497 498 // convert mesh_access_pdu_t into mesh_segmented_pdu_t 499 mesh_segmented_append_payload(crypto_buffer, upper_pdu->len, &message_pdu->segments); 500 501 // copy meta 502 message_pdu->len = upper_pdu->len; 503 message_pdu->netkey_index = upper_pdu->netkey_index; 504 message_pdu->transmic_len = upper_pdu->transmic_len; 505 message_pdu->akf_aid_control = upper_pdu->akf_aid_control; 506 message_pdu->flags = upper_pdu->flags; 507 508 // setup message_pdu header 509 // (void)memcpy(message_pdu->network_header, upper_pdu->network_header, 9); 510 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 511 message_pdu->network_header[0] = upper_pdu->ivi_nid; 512 message_pdu->network_header[1] = upper_pdu->ctl_ttl; 513 big_endian_store_24(message_pdu->network_header, 2, upper_pdu->seq); 514 big_endian_store_16(message_pdu->network_header, 5, upper_pdu->src); 515 big_endian_store_16(message_pdu->network_header, 7, upper_pdu->dst); 516 517 // queue up 518 upper_pdu->lower_pdu = (mesh_pdu_t *) message_pdu; 519 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 520 521 mesh_lower_transport_send_pdu((mesh_pdu_t*) message_pdu); 522 } 523 524 static void mesh_upper_transport_send_access_unsegmented(mesh_upper_transport_pdu_t * upper_pdu){ 525 526 // provide segment 527 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) upper_pdu->lower_pdu; 528 529 // setup network pdu 530 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS; 531 network_pdu->data[0] = upper_pdu->ivi_nid; 532 network_pdu->data[1] = upper_pdu->ctl_ttl; 533 big_endian_store_24(network_pdu->data, 2, upper_pdu->seq); 534 big_endian_store_16(network_pdu->data, 5, upper_pdu->src); 535 big_endian_store_16(network_pdu->data, 7, upper_pdu->dst); 536 network_pdu->netkey_index = upper_pdu->netkey_index; 537 538 // setup access message 539 network_pdu->data[9] = upper_pdu->akf_aid_control; 540 btstack_assert(upper_pdu->len < 15); 541 (void)memcpy(&network_pdu->data[10], crypto_buffer, upper_pdu->len); 542 network_pdu->len = 10 + upper_pdu->len; 543 network_pdu->flags = 0; 544 545 // queue up 546 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 547 548 mesh_lower_transport_send_pdu((mesh_pdu_t*) network_pdu); 549 } 550 551 static void mesh_upper_transport_send_access_ccm(void * arg){ 552 crypto_active = 0; 553 554 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 555 mesh_print_hex("EncAccessPayload", crypto_buffer, upper_pdu->len); 556 // store TransMIC 557 btstack_crypto_ccm_get_authentication_value(&ccm, &crypto_buffer[upper_pdu->len]); 558 mesh_print_hex("TransMIC", &crypto_buffer[upper_pdu->len], upper_pdu->transmic_len); 559 upper_pdu->len += upper_pdu->transmic_len; 560 mesh_print_hex("UpperTransportPDU", crypto_buffer, upper_pdu->len); 561 switch (upper_pdu->pdu_header.pdu_type){ 562 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 563 mesh_upper_transport_send_access_unsegmented(upper_pdu); 564 break; 565 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 566 mesh_upper_transport_send_access_segmented(upper_pdu); 567 break; 568 default: 569 btstack_assert(false); 570 } 571 } 572 573 static void mesh_upper_transport_send_access_digest(void *arg){ 574 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 575 uint16_t access_pdu_len = upper_pdu->len; 576 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, crypto_buffer, crypto_buffer, 577 &mesh_upper_transport_send_access_ccm, upper_pdu); 578 } 579 580 static void mesh_upper_transport_send_access(mesh_upper_transport_pdu_t * upper_pdu){ 581 582 // if dst is virtual address, lookup label uuid and hash 583 uint16_t aad_len = 0; 584 mesh_virtual_address_t * virtual_address = NULL; 585 if (mesh_network_address_virtual(upper_pdu->dst)){ 586 virtual_address = mesh_virtual_address_for_pseudo_dst(upper_pdu->dst); 587 if (!virtual_address){ 588 printf("No virtual address register for pseudo dst %4x\n", upper_pdu->dst); 589 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 590 return; 591 } 592 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 593 // printf_hexdump(virtual_address->label_uuid, 16); 594 aad_len = 16; 595 upper_pdu->dst = virtual_address->hash; 596 } 597 598 // get app or device key 599 uint16_t appkey_index = upper_pdu->appkey_index; 600 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(upper_pdu->netkey_index, appkey_index); 601 if (appkey == NULL){ 602 printf("AppKey %04x not found, drop message\n", appkey_index); 603 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 604 return; 605 } 606 607 // reserve slot 608 mesh_lower_transport_reserve_slot(); 609 610 // reserve one sequence number, which is also used to encrypt access payload 611 uint32_t seq = mesh_sequence_number_next(); 612 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 613 upper_pdu->seq = seq; 614 615 // also reserves crypto_buffer 616 crypto_active = 1; 617 618 // flatten segmented pdu into crypto buffer 619 uint16_t payload_len = mesh_upper_pdu_flatten(upper_pdu, crypto_buffer, sizeof(crypto_buffer)); 620 btstack_assert(payload_len == upper_pdu->len); 621 622 // Dump PDU 623 printf("[+] Upper transport, send upper (un)segmented Access PDU - dest %04x, seq %06x\n", upper_pdu->dst, upper_pdu->seq); 624 mesh_print_hex("Access Payload", crypto_buffer, upper_pdu->len); 625 626 // setup nonce - uses dst, so after pseudo address translation 627 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 628 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 629 } else { 630 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 631 } 632 633 // Dump key 634 mesh_print_hex("AppOrDevKey", appkey->key, 16); 635 636 // encrypt ccm 637 uint8_t transmic_len = upper_pdu->transmic_len; 638 uint16_t access_pdu_len = upper_pdu->len; 639 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 640 if (virtual_address){ 641 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 642 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, 643 &mesh_upper_transport_send_access_digest, upper_pdu); 644 } else { 645 mesh_upper_transport_send_access_digest(upper_pdu); 646 } 647 } 648 649 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 650 // reserve slot 651 mesh_lower_transport_reserve_slot(); 652 // reserve sequence number 653 uint32_t seq = mesh_sequence_number_next(); 654 mesh_network_pdu_set_seq(network_pdu, seq); 655 // Dump PDU 656 uint8_t opcode = network_pdu->data[9]; 657 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 658 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 659 660 // send 661 mesh_lower_transport_send_pdu((mesh_pdu_t *) network_pdu); 662 } 663 664 static void mesh_upper_transport_send_segmented_control_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 665 // reserve slot 666 mesh_lower_transport_reserve_slot(); 667 // reserve sequence number 668 uint32_t seq = mesh_sequence_number_next(); 669 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 670 upper_pdu->seq = seq; 671 // Dump PDU 672 // uint8_t opcode = upper_pdu->data[0]; 673 // printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", upper_pdu, seq, opcode); 674 // mesh_print_hex("Access Payload", &upper_pdu->data[1], upper_pdu->len - 1); 675 // send 676 mesh_segmented_pdu_t *message_pdu = &outgoing_segmented_pdu_singleton; 677 message_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 678 679 // lend segments to lower transport pdu 680 message_pdu->segments = upper_pdu->segments; 681 upper_pdu->segments = NULL; 682 683 // copy meta 684 message_pdu->len = upper_pdu->len; 685 message_pdu->netkey_index = upper_pdu->netkey_index; 686 message_pdu->transmic_len = 0; // no TransMIC for control 687 message_pdu->akf_aid_control = upper_pdu->akf_aid_control; 688 message_pdu->flags = upper_pdu->flags; 689 690 // setup message_pdu header 691 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 692 message_pdu->network_header[0] = upper_pdu->ivi_nid; 693 message_pdu->network_header[1] = upper_pdu->ctl_ttl; 694 big_endian_store_24(message_pdu->network_header, 2, upper_pdu->seq); 695 big_endian_store_16(message_pdu->network_header, 5, upper_pdu->src); 696 big_endian_store_16(message_pdu->network_header, 7, upper_pdu->dst); 697 698 // queue up 699 upper_pdu->lower_pdu = (mesh_pdu_t *) message_pdu; 700 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 701 702 mesh_lower_transport_send_pdu((mesh_pdu_t *) message_pdu); 703 } 704 705 static void mesh_upper_transport_run(void){ 706 707 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 708 709 if (crypto_active) return; 710 711 // get next message 712 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(&upper_transport_incoming); 713 mesh_network_pdu_t * network_pdu; 714 mesh_segmented_pdu_t * message_pdu; 715 switch (pdu->pdu_type){ 716 case MESH_PDU_TYPE_UNSEGMENTED: 717 network_pdu = (mesh_network_pdu_t *) pdu; 718 // control? 719 if (mesh_network_control(network_pdu)) { 720 721 incoming_control_pdu = &incoming_control_pdu_singleton; 722 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 723 incoming_control_pdu->len = network_pdu->len; 724 incoming_control_pdu->netkey_index = network_pdu->netkey_index; 725 726 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 727 728 incoming_control_pdu->akf_aid_control = lower_transport_pdu[0]; 729 incoming_control_pdu->len = network_pdu->len - 10; // 9 header + 1 opcode 730 (void)memcpy(incoming_control_pdu->data, &lower_transport_pdu[1], incoming_control_pdu->len); 731 732 // copy meta data into encrypted pdu buffer 733 (void)memcpy(incoming_control_pdu->network_header, network_pdu->data, 9); 734 735 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 736 737 // free mesh message 738 mesh_lower_transport_message_processed_by_higher_layer(pdu); 739 740 btstack_assert(mesh_control_message_handler != NULL); 741 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 742 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 743 744 } else { 745 746 incoming_access_pdu_encrypted = &incoming_access_pdu_encrypted_singleton; 747 incoming_access_pdu_encrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 748 incoming_access_pdu_decrypted = &incoming_access_pdu_decrypted_singleton; 749 750 incoming_access_pdu_encrypted->netkey_index = network_pdu->netkey_index; 751 incoming_access_pdu_encrypted->transmic_len = 4; 752 753 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 754 755 incoming_access_pdu_encrypted->akf_aid_control = lower_transport_pdu[0]; 756 incoming_access_pdu_encrypted->len = network_pdu->len - 10; // 9 header + 1 AID 757 (void)memcpy(incoming_access_pdu_encrypted->data, &lower_transport_pdu[1], incoming_access_pdu_encrypted->len); 758 759 // copy meta data into encrypted pdu buffer 760 (void)memcpy(incoming_access_pdu_encrypted->network_header, network_pdu->data, 9); 761 762 mesh_print_hex("Assembled payload", incoming_access_pdu_encrypted->data, incoming_access_pdu_encrypted->len); 763 764 // free mesh message 765 mesh_lower_transport_message_processed_by_higher_layer(pdu); 766 767 // get encoded transport pdu and start processing 768 mesh_upper_transport_process_segmented_message(); 769 } 770 break; 771 case MESH_PDU_TYPE_SEGMENTED: 772 message_pdu = (mesh_segmented_pdu_t *) pdu; 773 uint8_t ctl = mesh_message_ctl(message_pdu); 774 if (ctl){ 775 incoming_control_pdu= &incoming_control_pdu_singleton; 776 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 777 778 // flatten 779 mesh_segmented_pdu_flatten(&message_pdu->segments, 8, incoming_control_pdu->data); 780 781 // copy meta data into encrypted pdu buffer 782 incoming_control_pdu->len = message_pdu->len; 783 incoming_control_pdu->netkey_index = message_pdu->netkey_index; 784 incoming_control_pdu->akf_aid_control = message_pdu->akf_aid_control; 785 incoming_control_pdu->flags = 0; 786 (void)memcpy(incoming_control_pdu->network_header, message_pdu->network_header, 9); 787 788 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 789 790 // free mesh message 791 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 792 793 btstack_assert(mesh_control_message_handler != NULL); 794 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 795 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 796 797 } else { 798 799 incoming_access_pdu_encrypted = &incoming_access_pdu_encrypted_singleton; 800 incoming_access_pdu_encrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 801 incoming_access_pdu_decrypted = &incoming_access_pdu_decrypted_singleton; 802 803 // flatten 804 mesh_segmented_pdu_flatten(&message_pdu->segments, 12, incoming_access_pdu_encrypted->data); 805 806 // copy meta data into encrypted pdu buffer 807 incoming_access_pdu_encrypted->len = message_pdu->len; 808 incoming_access_pdu_encrypted->netkey_index = message_pdu->netkey_index; 809 incoming_access_pdu_encrypted->transmic_len = message_pdu->transmic_len; 810 incoming_access_pdu_encrypted->akf_aid_control = message_pdu->akf_aid_control; 811 (void)memcpy(incoming_access_pdu_encrypted->network_header, message_pdu->network_header, 9); 812 813 mesh_print_hex("Assembled payload", incoming_access_pdu_encrypted->data, incoming_access_pdu_encrypted->len); 814 815 // free mesh message 816 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 817 818 // get encoded transport pdu and start processing 819 mesh_upper_transport_process_segmented_message(); 820 } 821 break; 822 default: 823 btstack_assert(0); 824 break; 825 } 826 } 827 828 while (!btstack_linked_list_empty(&upper_transport_outgoing)){ 829 830 if (crypto_active) break; 831 832 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_outgoing); 833 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == 0) break; 834 835 mesh_upper_transport_pdu_t * upper_pdu; 836 837 switch (pdu->pdu_type){ 838 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 839 // control pdus can go through directly 840 btstack_assert(mesh_pdu_ctl(pdu) != 0); 841 (void) btstack_linked_list_pop(&upper_transport_outgoing); 842 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 843 break; 844 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 845 // control pdus can go through directly 846 btstack_assert(mesh_pdu_ctl(pdu) != 0); 847 (void) btstack_linked_list_pop(&upper_transport_outgoing); 848 mesh_upper_transport_send_segmented_control_pdu((mesh_upper_transport_pdu_t *) pdu); 849 break; 850 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 851 // segmented access pdus required a mesh-segmented-pdu 852 if (upper_transport_outgoing_segmented == NULL){ 853 upper_transport_outgoing_segmented = btstack_memory_mesh_segmented_pdu_get(); 854 } 855 if (upper_transport_outgoing_segmented == NULL) break; 856 upper_transport_outgoing_segmented->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 857 // and a mesh-network-pdu for each segments 858 // TODO: reserve segments 859 (void) btstack_linked_list_pop(&upper_transport_outgoing); 860 mesh_upper_transport_send_access((mesh_upper_transport_pdu_t *) pdu); 861 break; 862 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 863 // unsegmented access pdus require a single mesh-network-dpu 864 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 865 if (upper_pdu->lower_pdu == NULL){ 866 upper_pdu->lower_pdu = (mesh_pdu_t *) mesh_network_pdu_get(); 867 } 868 if (upper_pdu->lower_pdu == NULL) break; 869 (void) btstack_linked_list_pop(&upper_transport_outgoing); 870 mesh_upper_transport_send_access((mesh_upper_transport_pdu_t *) pdu); 871 break; 872 default: 873 btstack_assert(false); 874 break; 875 } 876 } 877 } 878 879 static mesh_upper_transport_pdu_t * mesh_upper_transport_find_pdu_for_lower(mesh_pdu_t * pdu_to_find){ 880 btstack_linked_list_iterator_t it; 881 btstack_linked_list_iterator_init(&it, &upper_transport_outgoing_active); 882 mesh_upper_transport_pdu_t * upper_pdu; 883 while (btstack_linked_list_iterator_has_next(&it)){ 884 mesh_pdu_t * mesh_pdu = (mesh_pdu_t *) btstack_linked_list_iterator_next(&it); 885 switch (mesh_pdu->pdu_type){ 886 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 887 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 888 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 889 upper_pdu = (mesh_upper_transport_pdu_t *) mesh_pdu; 890 if (upper_pdu->lower_pdu == pdu_to_find){ 891 btstack_linked_list_iterator_remove(&it); 892 return upper_pdu; 893 } 894 break; 895 default: 896 break; 897 } 898 } 899 return NULL; 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_upper_transport_pdu_t * upper_pdu; 904 mesh_network_pdu_t * network_pdu; 905 mesh_segmented_pdu_t * segmented_pdu; 906 switch (callback_type){ 907 case MESH_TRANSPORT_PDU_RECEIVED: 908 mesh_upper_transport_message_received(pdu); 909 break; 910 case MESH_TRANSPORT_PDU_SENT: 911 switch (pdu->pdu_type){ 912 case MESH_PDU_TYPE_SEGMENTED: 913 // try to find in outgoing active 914 upper_pdu = mesh_upper_transport_find_pdu_for_lower(pdu); 915 btstack_assert(upper_pdu != NULL); 916 segmented_pdu = (mesh_segmented_pdu_t *) pdu; 917 // free chunks 918 while (!btstack_linked_list_empty(&segmented_pdu->segments)){ 919 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&segmented_pdu->segments); 920 mesh_network_pdu_free(network_pdu); 921 } 922 // TODO: free segmented_pdu 923 upper_pdu->lower_pdu = NULL; 924 switch (upper_pdu->pdu_header.pdu_type){ 925 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 926 mesh_control_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 927 break; 928 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 929 mesh_access_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 930 break; 931 default: 932 btstack_assert(false); 933 break; 934 } 935 break; 936 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 937 // find corresponding upper transport pdu and free single segment 938 upper_pdu = mesh_upper_transport_find_pdu_for_lower(pdu); 939 btstack_assert(upper_pdu != NULL); 940 btstack_assert(upper_pdu->lower_pdu == (mesh_pdu_t *) pdu); 941 mesh_network_pdu_free((mesh_network_pdu_t *) pdu); 942 upper_pdu->lower_pdu = NULL; 943 mesh_access_message_handler(callback_type, status, (mesh_pdu_t*) upper_pdu); 944 break; 945 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 946 mesh_access_message_handler(callback_type, status, pdu); 947 break; 948 default: 949 btstack_assert(false); 950 break; 951 } 952 mesh_upper_transport_run(); 953 break; 954 default: 955 break; 956 } 957 } 958 959 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 960 mesh_network_pdu_t * network_pdu; 961 mesh_segmented_pdu_t * message_pdu; 962 switch (pdu->pdu_type) { 963 case MESH_PDU_TYPE_NETWORK: 964 network_pdu = (mesh_network_pdu_t *) pdu; 965 mesh_network_pdu_free(network_pdu); 966 break; 967 case MESH_PDU_TYPE_SEGMENTED: 968 message_pdu = (mesh_segmented_pdu_t *) pdu; 969 mesh_message_pdu_free(message_pdu); 970 default: 971 btstack_assert(false); 972 break; 973 } 974 } 975 976 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 977 crypto_active = 0; 978 switch (pdu->pdu_type){ 979 case MESH_PDU_TYPE_ACCESS: 980 mesh_upper_transport_process_access_message_done((mesh_access_pdu_t *) pdu); 981 case MESH_PDU_TYPE_CONTROL: 982 mesh_upper_transport_process_control_message_done((mesh_control_pdu_t *) pdu); 983 break; 984 default: 985 btstack_assert(0); 986 break; 987 } 988 } 989 990 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 991 switch (pdu->pdu_type){ 992 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 993 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 994 break; 995 default: 996 btstack_assert(false); 997 break; 998 } 999 1000 btstack_assert(((mesh_upper_transport_pdu_t *) pdu)->lower_pdu == NULL); 1001 1002 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1003 mesh_upper_transport_run(); 1004 } 1005 1006 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 1007 switch (pdu->pdu_type){ 1008 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1009 break; 1010 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1011 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 1012 break; 1013 default: 1014 btstack_assert(false); 1015 break; 1016 } 1017 1018 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1019 mesh_upper_transport_run(); 1020 } 1021 1022 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, 1023 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1024 1025 if (control_pdu_len > 11) return 1; 1026 1027 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1028 if (!network_key) return 1; 1029 1030 uint8_t transport_pdu_data[12]; 1031 transport_pdu_data[0] = opcode; 1032 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 1033 uint16_t transport_pdu_len = control_pdu_len + 1; 1034 1035 // setup network_pdu 1036 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 1037 1038 return 0; 1039 } 1040 1041 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, 1042 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1043 1044 if (control_pdu_len > 256) return 1; 1045 1046 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1047 if (!network_key) return 1; 1048 1049 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1050 upper_pdu->ctl_ttl = ttl; 1051 upper_pdu->src = src; 1052 upper_pdu->dst = dest; 1053 upper_pdu->transmic_len = 0; // no TransMIC for control 1054 upper_pdu->netkey_index = netkey_index; 1055 upper_pdu->akf_aid_control = opcode; 1056 1057 mesh_segmented_append_payload(control_pdu_data, control_pdu_len, &upper_pdu->segments); 1058 upper_pdu->len = control_pdu_len; 1059 return 0; 1060 } 1061 1062 uint8_t mesh_upper_transport_setup_control_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, 1063 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1064 switch (pdu->pdu_type){ 1065 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1066 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); 1067 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1068 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); 1069 default: 1070 btstack_assert(0); 1071 return 1; 1072 } 1073 } 1074 1075 static uint8_t mesh_upper_transport_setup_segmented_access_pdu_header(mesh_access_pdu_t * access_pdu, uint16_t netkey_index, 1076 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1077 1078 // get app or device key 1079 const mesh_transport_key_t *appkey; 1080 appkey = mesh_transport_key_get(appkey_index); 1081 if (appkey == NULL) { 1082 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 1083 return 1; 1084 } 1085 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1086 1087 // lookup network by netkey_index 1088 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 1089 if (!network_key) return 1; 1090 if (network_key == NULL) { 1091 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 1092 return 1; 1093 } 1094 1095 const uint8_t trans_mic_len = szmic ? 8 : 4; 1096 1097 // store in transport pdu 1098 access_pdu->transmic_len = trans_mic_len; 1099 access_pdu->netkey_index = netkey_index; 1100 access_pdu->appkey_index = appkey_index; 1101 access_pdu->akf_aid_control = akf_aid; 1102 mesh_access_set_nid_ivi(access_pdu, network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7)); 1103 mesh_access_set_src(access_pdu, src); 1104 mesh_access_set_dest(access_pdu, dest); 1105 mesh_access_set_ctl_ttl(access_pdu, ttl); 1106 return 0; 1107 } 1108 1109 static uint8_t mesh_upper_transport_setup_upper_access_pdu_header(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, 1110 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1111 1112 // get app or device key 1113 const mesh_transport_key_t *appkey; 1114 appkey = mesh_transport_key_get(appkey_index); 1115 if (appkey == NULL) { 1116 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 1117 return 1; 1118 } 1119 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1120 1121 // lookup network by netkey_index 1122 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 1123 if (!network_key) return 1; 1124 if (network_key == NULL) { 1125 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 1126 return 1; 1127 } 1128 1129 const uint8_t trans_mic_len = szmic ? 8 : 4; 1130 1131 // store in transport pdu 1132 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1133 upper_pdu->ctl_ttl = ttl; 1134 upper_pdu->src = src; 1135 upper_pdu->dst = dest; 1136 upper_pdu->transmic_len = trans_mic_len; 1137 upper_pdu->netkey_index = netkey_index; 1138 upper_pdu->appkey_index = appkey_index; 1139 upper_pdu->akf_aid_control = akf_aid; 1140 return 0; 1141 } 1142 1143 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, 1144 uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 1145 int status = mesh_upper_transport_setup_upper_access_pdu_header(upper_pdu, netkey_index, appkey_index, ttl, src, 1146 dest, szmic); 1147 if (status) return status; 1148 1149 // store in transport pdu 1150 mesh_segmented_append_payload(access_pdu_data, access_pdu_len, &upper_pdu->segments); 1151 upper_pdu->len = access_pdu_len; 1152 return 0; 1153 } 1154 1155 1156 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 1157 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1158 switch (pdu->pdu_type){ 1159 case MESH_PDU_TYPE_ACCESS: 1160 return mesh_upper_transport_setup_segmented_access_pdu_header((mesh_access_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 1161 default: 1162 btstack_assert(false); 1163 return 1; 1164 } 1165 } 1166 1167 uint8_t mesh_upper_transport_setup_access_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 1168 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic, 1169 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 1170 switch (pdu->pdu_type){ 1171 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1172 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1173 return mesh_upper_transport_setup_upper_access_pdu((mesh_upper_transport_pdu_t *) pdu, netkey_index, 1174 appkey_index, ttl, src, dest, szmic, access_pdu_data, 1175 access_pdu_len); 1176 default: 1177 btstack_assert(false); 1178 return 1; 1179 } 1180 } 1181 1182 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)) { 1183 mesh_access_message_handler = callback; 1184 } 1185 1186 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)){ 1187 mesh_control_message_handler = callback; 1188 } 1189 1190 void mesh_upper_transport_init(){ 1191 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1192 } 1193