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 #include <stdarg.h> 39 #include "btstack_tlv.h" 40 #include "mesh/mesh_foundation.h" 41 #include "mesh_upper_transport.h" 42 #include "mesh/mesh.h" 43 #include "mesh/mesh_proxy.h" 44 #include "mesh/mesh_node.h" 45 46 #define BTSTACK_FILE__ "mesh_upper_transport.c" 47 48 #include "mesh/mesh_upper_transport.h" 49 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 54 #include "btstack_util.h" 55 #include "btstack_memory.h" 56 #include "btstack_debug.h" 57 #include "btstack_bool.h" 58 59 #include "mesh/beacon.h" 60 #include "mesh/mesh_iv_index_seq_number.h" 61 #include "mesh/mesh_keys.h" 62 #include "mesh/mesh_lower_transport.h" 63 #include "mesh/mesh_peer.h" 64 #include "mesh/mesh_virtual_addresses.h" 65 66 // TODO: extract mesh_pdu functions into lower transport or network 67 #include "mesh/mesh_access.h" 68 69 // MESH_ACCESS_MESH_NETWORK_PAYLOAD_MAX (384) / MESH_NETWORK_PAYLOAD_MAX (29) = 13.24.. < 14 70 #define MESSAGE_BUILDER_MAX_NUM_NETWORK_PDUS (14) 71 72 // combined key x address iterator for upper transport decryption 73 74 typedef struct { 75 // state 76 mesh_transport_key_iterator_t key_it; 77 mesh_virtual_address_iterator_t address_it; 78 // elements 79 const mesh_transport_key_t * key; 80 const mesh_virtual_address_t * address; 81 // address - might be virtual 82 uint16_t dst; 83 // key info 84 } mesh_transport_key_and_virtual_address_iterator_t; 85 86 static void mesh_upper_transport_run(void); 87 static void mesh_upper_transport_schedule_send_requests(void); 88 static void mesh_upper_transport_validate_access_message(void); 89 90 // upper transport callbacks - in access layer 91 static void (*mesh_access_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 92 static void (*mesh_control_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 93 94 // 95 static int crypto_active; 96 static uint8_t application_nonce[13]; 97 static btstack_crypto_ccm_t ccm; 98 static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; 99 100 // incoming segmented (mesh_segmented_pdu_t) or unsegmented (network_pdu_t) 101 static mesh_pdu_t * incoming_access_encrypted; 102 103 // multi-purpose union: segmented control reassembly, decrypted access pdu 104 static union { 105 mesh_control_pdu_t control; 106 mesh_access_pdu_t access; 107 } incoming_pdu_singleton; 108 109 // pointer to incoming_pdu_singleton.access 110 static mesh_access_pdu_t * incoming_access_decrypted; 111 112 // pointer to incoming_pdu_singleton.access 113 static mesh_control_pdu_t * incoming_control_pdu; 114 115 // incoming incoming_access_decrypted ready to be deliverd 116 static bool incoming_access_pdu_ready; 117 118 // incoming unsegmented (network) and segmented (transport) control and access messages 119 static btstack_linked_list_t upper_transport_incoming; 120 121 122 // outgoing unsegmented and segmented control and access messages 123 static btstack_linked_list_t upper_transport_outgoing; 124 125 // outgoing upper transport messages that have been sent to lower transport and wait for sent event 126 static btstack_linked_list_t upper_transport_outgoing_active; 127 128 // outgoing send requests 129 static btstack_linked_list_t upper_transport_send_requests; 130 131 // message builder buffers 132 static mesh_upper_transport_pdu_t * message_builder_reserved_upper_pdu; 133 static uint8_t message_builder_num_network_pdus_reserved; 134 static btstack_linked_list_t message_builder_reserved_network_pdus; 135 136 // requets network pdus for outgoing send requests and outgoing run 137 static bool upper_transport_need_pdu_for_send_requests; 138 static bool upper_transport_need_pdu_for_run_outgoing; 139 140 // TODO: higher layer define used for assert 141 #define MESH_ACCESS_OPCODE_NOT_SET 0xFFFFFFFEu 142 143 static void mesh_print_hex(const char * name, const uint8_t * data, uint16_t len){ 144 printf("%-20s ", name); 145 printf_hexdump(data, len); 146 } 147 // static void mesh_print_x(const char * name, uint32_t value){ 148 // printf("%20s: 0x%x", name, (int) value); 149 // } 150 151 static void mesh_transport_key_and_virtual_address_iterator_init(mesh_transport_key_and_virtual_address_iterator_t *it, 152 uint16_t dst, uint16_t netkey_index, uint8_t akf, 153 uint8_t aid) { 154 printf("KEY_INIT: dst %04x, akf %x, aid %x\n", dst, akf, aid); 155 // config 156 it->dst = dst; 157 // init elements 158 it->key = NULL; 159 it->address = NULL; 160 // init element iterators 161 mesh_transport_key_aid_iterator_init(&it->key_it, netkey_index, akf, aid); 162 // init address iterator 163 if (mesh_network_address_virtual(it->dst)){ 164 mesh_virtual_address_iterator_init(&it->address_it, dst); 165 // get first key 166 if (mesh_transport_key_aid_iterator_has_more(&it->key_it)) { 167 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 168 } 169 } 170 } 171 172 // cartesian product: keys x addressses 173 static int mesh_transport_key_and_virtual_address_iterator_has_more(mesh_transport_key_and_virtual_address_iterator_t * it){ 174 if (mesh_network_address_virtual(it->dst)) { 175 // find next valid entry 176 while (true){ 177 if (mesh_virtual_address_iterator_has_more(&it->address_it)) return 1; 178 if (!mesh_transport_key_aid_iterator_has_more(&it->key_it)) return 0; 179 // get next key 180 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 181 mesh_virtual_address_iterator_init(&it->address_it, it->dst); 182 } 183 } else { 184 return mesh_transport_key_aid_iterator_has_more(&it->key_it); 185 } 186 } 187 188 static void mesh_transport_key_and_virtual_address_iterator_next(mesh_transport_key_and_virtual_address_iterator_t * it){ 189 if (mesh_network_address_virtual(it->dst)) { 190 it->address = mesh_virtual_address_iterator_get_next(&it->address_it); 191 } else { 192 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 193 } 194 } 195 196 // UPPER TRANSPORT 197 198 static void mesh_segmented_pdu_flatten(btstack_linked_list_t * segments, uint8_t segment_len, uint8_t * buffer) { 199 // assemble payload 200 btstack_linked_list_iterator_t it; 201 btstack_linked_list_iterator_init(&it, segments); 202 while (btstack_linked_list_iterator_has_next(&it)) { 203 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 204 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 205 uint8_t offset = 0; 206 while (offset < segment->len){ 207 uint8_t seg_o = segment->data[offset++]; 208 (void) memcpy(&buffer[seg_o * segment_len], &segment->data[offset], segment_len); 209 offset += segment_len; 210 } 211 } 212 } 213 214 static uint16_t mesh_upper_pdu_flatten(mesh_upper_transport_pdu_t * upper_pdu, uint8_t * buffer, uint16_t buffer_len) { 215 // assemble payload 216 btstack_linked_list_iterator_t it; 217 btstack_linked_list_iterator_init(&it, &upper_pdu->segments); 218 uint16_t offset = 0; 219 while (btstack_linked_list_iterator_has_next(&it)) { 220 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 221 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 222 btstack_assert((offset + segment->len) <= buffer_len); 223 (void) memcpy(&buffer[offset], segment->data, segment->len); 224 offset += segment->len; 225 } 226 return offset; 227 } 228 229 // store payload in provided list of network pdus 230 static void mesh_segmented_store_payload(const uint8_t * payload, uint16_t payload_len, btstack_linked_list_t * in_segments, btstack_linked_list_t * out_segments){ 231 uint16_t payload_offset = 0; 232 uint16_t bytes_current_segment = 0; 233 mesh_network_pdu_t * network_pdu = NULL; 234 while (payload_offset < payload_len){ 235 if (bytes_current_segment == 0){ 236 network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(in_segments); 237 btstack_assert(network_pdu != NULL); 238 btstack_linked_list_add_tail(out_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 // tries allocate and add enough segments to store payload of given size 250 static bool mesh_segmented_allocate_segments(btstack_linked_list_t * segments, uint16_t payload_len){ 251 uint16_t storage_size = btstack_linked_list_count(segments) * MESH_NETWORK_PAYLOAD_MAX; 252 while (storage_size < payload_len){ 253 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 254 if (network_pdu == NULL) break; 255 storage_size += MESH_NETWORK_PAYLOAD_MAX; 256 btstack_linked_list_add(segments, (btstack_linked_item_t *) network_pdu); 257 } 258 return (storage_size >= payload_len); 259 } 260 261 // stub lower transport 262 263 static void mesh_upper_transport_dump_pdus(const char *name, btstack_linked_list_t *list){ 264 printf("List: %s:\n", name); 265 btstack_linked_list_iterator_t it; 266 btstack_linked_list_iterator_init(&it, list); 267 while (btstack_linked_list_iterator_has_next(&it)){ 268 mesh_pdu_t * pdu = (mesh_pdu_t*) btstack_linked_list_iterator_next(&it); 269 printf("- %p\n", pdu); 270 // printf_hexdump( mesh_pdu_data(pdu), mesh_pdu_len(pdu)); 271 } 272 } 273 274 static void mesh_upper_transport_reset_pdus(btstack_linked_list_t *list){ 275 while (!btstack_linked_list_empty(list)){ 276 mesh_upper_transport_pdu_free((mesh_pdu_t *) btstack_linked_list_pop(list)); 277 } 278 } 279 280 void mesh_upper_transport_dump(void){ 281 mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); 282 } 283 284 void mesh_upper_transport_reset(void){ 285 crypto_active = 0; 286 mesh_upper_transport_reset_pdus(&upper_transport_incoming); 287 } 288 289 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 290 // Device Key is fixed 291 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 292 return mesh_transport_key_get(appkey_index); 293 } 294 295 // Get key refresh state from subnet 296 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 297 if (subnet == NULL) return NULL; 298 299 // identify old and new app keys for given appkey_index 300 mesh_transport_key_t * old_key = NULL; 301 mesh_transport_key_t * new_key = NULL; 302 mesh_transport_key_iterator_t it; 303 mesh_transport_key_iterator_init(&it, netkey_index); 304 while (mesh_transport_key_iterator_has_more(&it)){ 305 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 306 if (transport_key->appkey_index != appkey_index) continue; 307 if (transport_key->old_key == 0) { 308 new_key = transport_key; 309 } else { 310 old_key = transport_key; 311 } 312 } 313 314 // if no key is marked as old, just use the current one 315 if (old_key == NULL) return new_key; 316 317 // use new key if it exists in phase two 318 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 319 return new_key; 320 } else { 321 return old_key; 322 } 323 } 324 325 static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ 326 // get IV Index and IVI 327 uint32_t iv_index = mesh_get_iv_index(); 328 int ivi = ivi_nid >> 7; 329 330 // if least significant bit differs, use previous IV Index 331 if ((iv_index & 1 ) ^ ivi){ 332 iv_index--; 333 } 334 return iv_index; 335 } 336 337 static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 338 mesh_access_pdu_t * access_pdu; 339 mesh_upper_transport_pdu_t * upper_pdu; 340 switch (pdu->pdu_type){ 341 case MESH_PDU_TYPE_ACCESS: 342 access_pdu = (mesh_access_pdu_t *) pdu; 343 nonce[1] = ((access_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 0x80 : 0x00; 344 big_endian_store_24(nonce, 2, access_pdu->seq); 345 big_endian_store_16(nonce, 5, access_pdu->src); 346 big_endian_store_16(nonce, 7, access_pdu->dst); 347 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(access_pdu->ivi_nid)); 348 break; 349 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 350 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 351 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 352 nonce[1] = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 0x80 : 0x00; 353 // 'network header' 354 big_endian_store_24(nonce, 2, upper_pdu->seq); 355 big_endian_store_16(nonce, 5, upper_pdu->src); 356 big_endian_store_16(nonce, 7, upper_pdu->dst); 357 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(upper_pdu->ivi_nid)); 358 break; 359 default: 360 btstack_assert(0); 361 break; 362 } 363 } 364 365 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 366 nonce[0] = 0x01; 367 transport_segmented_setup_nonce(nonce, pdu); 368 mesh_print_hex("AppNonce", nonce, 13); 369 } 370 371 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 372 nonce[0] = 0x02; 373 transport_segmented_setup_nonce(nonce, pdu); 374 mesh_print_hex("DeviceNonce", nonce, 13); 375 } 376 377 static void mesh_upper_transport_process_access_message_done(mesh_access_pdu_t *access_pdu){ 378 crypto_active = 0; 379 btstack_assert((access_pdu->ctl_ttl & 0x80) == 0); 380 mesh_lower_transport_message_processed_by_higher_layer(incoming_access_encrypted); 381 incoming_access_encrypted = NULL; 382 incoming_access_decrypted = NULL; 383 mesh_upper_transport_run(); 384 } 385 386 static void mesh_upper_transport_process_control_message_done(mesh_control_pdu_t * control_pdu){ 387 crypto_active = 0; 388 incoming_control_pdu = NULL; 389 mesh_upper_transport_run(); 390 } 391 392 static void mesh_upper_transport_network_pdu_freed(void){ 393 // call both while prioritizing run outgoing 394 // both functions will trigger request for network pdu if needed 395 if (upper_transport_need_pdu_for_run_outgoing){ 396 upper_transport_need_pdu_for_run_outgoing = false; 397 mesh_upper_transport_run(); 398 } 399 if (upper_transport_need_pdu_for_send_requests){ 400 upper_transport_need_pdu_for_send_requests = false; 401 mesh_upper_transport_schedule_send_requests(); 402 } 403 } 404 405 static void mesh_upper_transport_need_pdu_for_send_requests(void) { 406 bool waiting = upper_transport_need_pdu_for_send_requests || upper_transport_need_pdu_for_run_outgoing; 407 upper_transport_need_pdu_for_send_requests = true; 408 if (waiting == false) { 409 mesh_network_notify_on_freed_pdu(&mesh_upper_transport_network_pdu_freed); 410 } 411 } 412 static void mesh_upper_transport_need_pdu_for_run_outgoing(void) { 413 bool waiting = upper_transport_need_pdu_for_send_requests || upper_transport_need_pdu_for_run_outgoing; 414 upper_transport_need_pdu_for_run_outgoing = true; 415 if (waiting == false) { 416 mesh_network_notify_on_freed_pdu(&mesh_upper_transport_network_pdu_freed); 417 } 418 } 419 420 static void mesh_upper_transport_deliver_access_message(void) { 421 incoming_access_pdu_ready = false; 422 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t *) incoming_access_decrypted); 423 } 424 425 static bool mesh_upper_transport_send_requests_pending(void){ 426 if (incoming_access_pdu_ready) { 427 return true; 428 } 429 return btstack_linked_list_empty(&upper_transport_send_requests) == false; 430 } 431 432 static void mesh_upper_transport_schedule_send_requests(void){ 433 434 while (mesh_upper_transport_send_requests_pending()){ 435 436 // get ready 437 bool message_builder_ready = mesh_upper_transport_message_reserve(); 438 439 if (message_builder_ready == false){ 440 // waiting for free upper pdu, we will get called again on pdu free 441 if (message_builder_reserved_upper_pdu == false){ 442 return; 443 } 444 // request callback on network pdu free 445 mesh_upper_transport_need_pdu_for_send_requests(); 446 return; 447 } 448 449 // process send requests 450 451 // incoming access pdu 452 if (incoming_access_pdu_ready){ 453 // message builder ready = one outgoing pdu is guaranteed, deliver access pdu 454 mesh_upper_transport_deliver_access_message(); 455 continue; 456 } 457 458 // regular send request 459 btstack_context_callback_registration_t * send_request = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&upper_transport_send_requests); 460 btstack_assert(send_request != NULL); 461 (*send_request->callback)(send_request->context); 462 } 463 } 464 465 void mesh_upper_transport_request_to_send(btstack_context_callback_registration_t * request){ 466 btstack_linked_list_add_tail(&upper_transport_send_requests, (btstack_linked_item_t *) request); 467 mesh_upper_transport_schedule_send_requests(); 468 } 469 470 static void mesh_upper_transport_validate_access_message_ccm(void * arg){ 471 UNUSED(arg); 472 473 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 474 uint8_t * upper_transport_pdu = incoming_access_decrypted->data; 475 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 476 477 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 478 479 // store TransMIC 480 uint8_t trans_mic[8]; 481 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 482 mesh_print_hex("TransMIC", trans_mic, transmic_len); 483 484 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], transmic_len) == 0){ 485 printf("TransMIC matches\n"); 486 487 // remove TransMIC from payload 488 incoming_access_decrypted->len -= transmic_len; 489 490 // if virtual address, update dst to pseudo_dst 491 if (mesh_network_address_virtual(incoming_access_decrypted->dst)){ 492 incoming_access_decrypted->dst = mesh_transport_key_it.address->pseudo_dst; 493 } 494 495 // pass to upper layer 496 incoming_access_pdu_ready = true; 497 mesh_upper_transport_schedule_send_requests(); 498 499 } else { 500 uint8_t akf = incoming_access_decrypted->akf_aid_control & 0x40; 501 if (akf){ 502 printf("TransMIC does not match, try next key\n"); 503 mesh_upper_transport_validate_access_message(); 504 } else { 505 printf("TransMIC does not match device key, done\n"); 506 // done 507 mesh_upper_transport_process_access_message_done(incoming_access_decrypted); 508 } 509 } 510 } 511 512 static void mesh_upper_transport_validate_access_message_digest(void * arg){ 513 UNUSED(arg); 514 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 515 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 516 uint8_t * upper_transport_pdu_data_out = incoming_access_decrypted->data; 517 518 mesh_network_pdu_t * unsegmented_pdu = NULL; 519 mesh_segmented_pdu_t * segmented_pdu = NULL; 520 switch (incoming_access_encrypted->pdu_type){ 521 case MESH_PDU_TYPE_SEGMENTED: 522 segmented_pdu = (mesh_segmented_pdu_t *) incoming_access_encrypted; 523 mesh_segmented_pdu_flatten(&segmented_pdu->segments, 12, upper_transport_pdu_data_out); 524 mesh_print_hex("Encrypted Payload:", upper_transport_pdu_data_out, upper_transport_pdu_len); 525 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_out, upper_transport_pdu_data_out, 526 &mesh_upper_transport_validate_access_message_ccm, NULL); 527 break; 528 case MESH_PDU_TYPE_UNSEGMENTED: 529 unsegmented_pdu = (mesh_network_pdu_t *) incoming_access_encrypted; 530 (void)memcpy(upper_transport_pdu_data_out, &unsegmented_pdu->data[10], incoming_access_decrypted->len); 531 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_out, upper_transport_pdu_data_out, 532 &mesh_upper_transport_validate_access_message_ccm, NULL); 533 break; 534 default: 535 btstack_assert(false); 536 break; 537 } 538 539 } 540 541 static void mesh_upper_transport_validate_access_message(void){ 542 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 543 uint8_t * upper_transport_pdu_data = incoming_access_decrypted->data; 544 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 545 546 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 547 printf("No valid transport key found\n"); 548 mesh_upper_transport_process_access_message_done(incoming_access_decrypted); 549 return; 550 } 551 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 552 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 553 554 if (message_key->akf){ 555 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) incoming_access_decrypted); 556 } else { 557 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) incoming_access_decrypted); 558 } 559 560 // store application / device key index 561 mesh_print_hex("AppOrDevKey", message_key->key, 16); 562 incoming_access_decrypted->appkey_index = message_key->appkey_index; 563 564 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 565 566 // decrypt ccm 567 crypto_active = 1; 568 uint16_t aad_len = 0; 569 if (mesh_network_address_virtual(incoming_access_decrypted->dst)){ 570 aad_len = 16; 571 } 572 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, transmic_len); 573 574 if (aad_len){ 575 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, 576 &mesh_upper_transport_validate_access_message_digest, NULL); 577 } else { 578 mesh_upper_transport_validate_access_message_digest(NULL); 579 } 580 } 581 582 static void mesh_upper_transport_process_access_message(void){ 583 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 584 uint8_t * upper_transport_pdu = incoming_access_decrypted->data; 585 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 586 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 587 588 uint8_t aid = incoming_access_decrypted->akf_aid_control & 0x3f; 589 uint8_t akf = (incoming_access_decrypted->akf_aid_control & 0x40) >> 6; 590 591 printf("AKF: %u\n", akf); 592 printf("AID: %02x\n", aid); 593 594 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, incoming_access_decrypted->dst, 595 incoming_access_decrypted->netkey_index, akf, aid); 596 mesh_upper_transport_validate_access_message(); 597 } 598 599 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 600 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 601 mesh_upper_transport_run(); 602 } 603 604 static void mesh_upper_transport_send_access_segmented(mesh_upper_transport_pdu_t * upper_pdu){ 605 606 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 607 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 608 609 // convert mesh_access_pdu_t into mesh_segmented_pdu_t 610 btstack_linked_list_t free_segments = segmented_pdu->segments; 611 segmented_pdu->segments = NULL; 612 mesh_segmented_store_payload(incoming_pdu_singleton.access.data, upper_pdu->len, &free_segments, &segmented_pdu->segments); 613 614 // copy meta 615 segmented_pdu->len = upper_pdu->len; 616 segmented_pdu->netkey_index = upper_pdu->netkey_index; 617 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 618 segmented_pdu->flags = upper_pdu->flags; 619 620 // setup segmented_pdu header 621 // (void)memcpy(segmented_pdu->network_header, upper_pdu->network_header, 9); 622 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 623 segmented_pdu->ivi_nid = upper_pdu->ivi_nid; 624 segmented_pdu->ctl_ttl = upper_pdu->ctl_ttl; 625 segmented_pdu->seq = upper_pdu->seq; 626 segmented_pdu->src = upper_pdu->src; 627 segmented_pdu->dst = upper_pdu->dst; 628 629 // queue up 630 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 631 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 632 633 mesh_lower_transport_send_pdu((mesh_pdu_t*) segmented_pdu); 634 } 635 636 static void mesh_upper_transport_send_access_unsegmented(mesh_upper_transport_pdu_t * upper_pdu){ 637 638 // provide segment 639 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) upper_pdu->lower_pdu; 640 641 // setup network pdu 642 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS; 643 network_pdu->data[0] = upper_pdu->ivi_nid; 644 network_pdu->data[1] = upper_pdu->ctl_ttl; 645 big_endian_store_24(network_pdu->data, 2, upper_pdu->seq); 646 big_endian_store_16(network_pdu->data, 5, upper_pdu->src); 647 big_endian_store_16(network_pdu->data, 7, upper_pdu->dst); 648 network_pdu->netkey_index = upper_pdu->netkey_index; 649 650 // setup access message 651 network_pdu->data[9] = upper_pdu->akf_aid_control; 652 btstack_assert(upper_pdu->len < 15); 653 (void)memcpy(&network_pdu->data[10], &incoming_pdu_singleton.access.data, upper_pdu->len); 654 network_pdu->len = 10 + upper_pdu->len; 655 network_pdu->flags = 0; 656 657 // queue up 658 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 659 660 mesh_lower_transport_send_pdu((mesh_pdu_t*) network_pdu); 661 } 662 663 static void mesh_upper_transport_send_access_ccm(void * arg){ 664 crypto_active = 0; 665 666 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 667 mesh_print_hex("EncAccessPayload", incoming_pdu_singleton.access.data, upper_pdu->len); 668 // store TransMIC 669 btstack_crypto_ccm_get_authentication_value(&ccm, &incoming_pdu_singleton.access.data[upper_pdu->len]); 670 uint8_t transmic_len = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 671 mesh_print_hex("TransMIC", &incoming_pdu_singleton.access.data[upper_pdu->len], transmic_len); 672 upper_pdu->len += transmic_len; 673 mesh_print_hex("UpperTransportPDU", incoming_pdu_singleton.access.data, upper_pdu->len); 674 switch (upper_pdu->pdu_header.pdu_type){ 675 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 676 mesh_upper_transport_send_access_unsegmented(upper_pdu); 677 break; 678 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 679 mesh_upper_transport_send_access_segmented(upper_pdu); 680 break; 681 default: 682 btstack_assert(false); 683 } 684 } 685 686 static void mesh_upper_transport_send_access_digest(void *arg){ 687 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 688 uint16_t access_pdu_len = upper_pdu->len; 689 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, incoming_pdu_singleton.access.data, incoming_pdu_singleton.access.data, 690 &mesh_upper_transport_send_access_ccm, upper_pdu); 691 } 692 693 static void mesh_upper_transport_send_access(mesh_upper_transport_pdu_t * upper_pdu){ 694 695 // if dst is virtual address, lookup label uuid and hash 696 uint16_t aad_len = 0; 697 mesh_virtual_address_t * virtual_address = NULL; 698 if (mesh_network_address_virtual(upper_pdu->dst)){ 699 virtual_address = mesh_virtual_address_for_pseudo_dst(upper_pdu->dst); 700 if (!virtual_address){ 701 printf("No virtual address register for pseudo dst %4x\n", upper_pdu->dst); 702 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 703 return; 704 } 705 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 706 // printf_hexdump(virtual_address->label_uuid, 16); 707 aad_len = 16; 708 upper_pdu->dst = virtual_address->hash; 709 } 710 711 // get app or device key 712 uint16_t appkey_index = upper_pdu->appkey_index; 713 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(upper_pdu->netkey_index, appkey_index); 714 if (appkey == NULL){ 715 printf("AppKey %04x not found, drop message\n", appkey_index); 716 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 717 return; 718 } 719 720 // reserve slot 721 mesh_lower_transport_reserve_slot(); 722 723 // reserve one sequence number, which is also used to encrypt access payload 724 uint32_t seq = mesh_sequence_number_next(); 725 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 726 upper_pdu->seq = seq; 727 728 // also reserves crypto_buffer 729 crypto_active = 1; 730 731 // flatten segmented pdu into crypto buffer 732 uint16_t payload_len = mesh_upper_pdu_flatten(upper_pdu, incoming_pdu_singleton.access.data, sizeof(incoming_pdu_singleton.access.data)); 733 btstack_assert(payload_len == upper_pdu->len); 734 735 // Dump PDU 736 printf("[+] Upper transport, send upper (un)segmented Access PDU - dest %04x, seq %06x\n", upper_pdu->dst, upper_pdu->seq); 737 mesh_print_hex("Access Payload", incoming_pdu_singleton.access.data, upper_pdu->len); 738 739 // setup nonce - uses dst, so after pseudo address translation 740 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 741 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 742 } else { 743 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 744 } 745 746 // Dump key 747 mesh_print_hex("AppOrDevKey", appkey->key, 16); 748 749 // encrypt ccm 750 uint8_t transmic_len = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 751 uint16_t access_pdu_len = upper_pdu->len; 752 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 753 if (virtual_address){ 754 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 755 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, 756 &mesh_upper_transport_send_access_digest, upper_pdu); 757 } else { 758 mesh_upper_transport_send_access_digest(upper_pdu); 759 } 760 } 761 762 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 763 // reserve slot 764 mesh_lower_transport_reserve_slot(); 765 // reserve sequence number 766 uint32_t seq = mesh_sequence_number_next(); 767 mesh_network_pdu_set_seq(network_pdu, seq); 768 // Dump PDU 769 uint8_t opcode = network_pdu->data[9]; 770 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 771 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 772 773 // send 774 mesh_lower_transport_send_pdu((mesh_pdu_t *) network_pdu); 775 } 776 777 static void mesh_upper_transport_send_segmented_control_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 778 // reserve slot 779 mesh_lower_transport_reserve_slot(); 780 // reserve sequence number 781 uint32_t seq = mesh_sequence_number_next(); 782 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 783 upper_pdu->seq = seq; 784 // Dump PDU 785 // uint8_t opcode = upper_pdu->data[0]; 786 // printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", upper_pdu, seq, opcode); 787 // mesh_print_hex("Access Payload", &upper_pdu->data[1], upper_pdu->len - 1); 788 // send 789 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 790 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 791 792 // lend segments to lower transport pdu 793 segmented_pdu->segments = upper_pdu->segments; 794 upper_pdu->segments = NULL; 795 796 // copy meta 797 segmented_pdu->len = upper_pdu->len; 798 segmented_pdu->netkey_index = upper_pdu->netkey_index; 799 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 800 segmented_pdu->flags = upper_pdu->flags; 801 802 btstack_assert((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) == 0); 803 804 // setup segmented_pdu header 805 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 806 segmented_pdu->ivi_nid = upper_pdu->ivi_nid; 807 segmented_pdu->ctl_ttl = upper_pdu->ctl_ttl; 808 segmented_pdu->seq = upper_pdu->seq; 809 segmented_pdu->src = upper_pdu->src; 810 segmented_pdu->dst = upper_pdu->dst; 811 812 // queue up 813 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 814 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 815 816 mesh_lower_transport_send_pdu((mesh_pdu_t *) segmented_pdu); 817 } 818 819 static void mesh_upper_transport_run(void){ 820 821 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 822 823 if (crypto_active) return; 824 825 // get next message 826 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(&upper_transport_incoming); 827 mesh_network_pdu_t * network_pdu; 828 mesh_segmented_pdu_t * segmented_pdu; 829 switch (pdu->pdu_type){ 830 case MESH_PDU_TYPE_UNSEGMENTED: 831 network_pdu = (mesh_network_pdu_t *) pdu; 832 // control? 833 if (mesh_network_control(network_pdu)) { 834 835 incoming_control_pdu = &incoming_pdu_singleton.control; 836 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 837 incoming_control_pdu->len = network_pdu->len; 838 incoming_control_pdu->netkey_index = network_pdu->netkey_index; 839 840 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 841 842 incoming_control_pdu->akf_aid_control = lower_transport_pdu[0]; 843 incoming_control_pdu->len = network_pdu->len - 10; // 9 header + 1 opcode 844 (void)memcpy(incoming_control_pdu->data, &lower_transport_pdu[1], incoming_control_pdu->len); 845 846 // copy meta data into encrypted pdu buffer 847 incoming_control_pdu->ivi_nid = network_pdu->data[0]; 848 incoming_control_pdu->ctl_ttl = network_pdu->data[1]; 849 incoming_control_pdu->seq = big_endian_read_24(network_pdu->data, 2); 850 incoming_control_pdu->src = big_endian_read_16(network_pdu->data, 5); 851 incoming_control_pdu->dst = big_endian_read_16(network_pdu->data, 7); 852 853 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 854 855 // free mesh message 856 mesh_lower_transport_message_processed_by_higher_layer(pdu); 857 858 btstack_assert(mesh_control_message_handler != NULL); 859 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 860 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 861 862 } else { 863 864 incoming_access_encrypted = (mesh_pdu_t *) network_pdu; 865 866 incoming_access_decrypted = &incoming_pdu_singleton.access; 867 incoming_access_decrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 868 incoming_access_decrypted->flags = 0; 869 incoming_access_decrypted->netkey_index = network_pdu->netkey_index; 870 incoming_access_decrypted->akf_aid_control = network_pdu->data[9]; 871 incoming_access_decrypted->len = network_pdu->len - 10; // 9 header + 1 AID 872 incoming_access_decrypted->ivi_nid = network_pdu->data[0]; 873 incoming_access_decrypted->ctl_ttl = network_pdu->data[1]; 874 incoming_access_decrypted->seq = big_endian_read_24(network_pdu->data, 2); 875 incoming_access_decrypted->src = big_endian_read_16(network_pdu->data, 5); 876 incoming_access_decrypted->dst = big_endian_read_16(network_pdu->data, 7); 877 878 mesh_upper_transport_process_access_message(); 879 } 880 break; 881 case MESH_PDU_TYPE_SEGMENTED: 882 segmented_pdu = (mesh_segmented_pdu_t *) pdu; 883 uint8_t ctl = segmented_pdu->ctl_ttl >> 7; 884 if (ctl){ 885 incoming_control_pdu= &incoming_pdu_singleton.control; 886 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 887 888 // flatten 889 mesh_segmented_pdu_flatten(&segmented_pdu->segments, 8, incoming_control_pdu->data); 890 891 // copy meta data into encrypted pdu buffer 892 incoming_control_pdu->flags = 0; 893 incoming_control_pdu->len = segmented_pdu->len; 894 incoming_control_pdu->netkey_index = segmented_pdu->netkey_index; 895 incoming_control_pdu->akf_aid_control = segmented_pdu->akf_aid_control; 896 incoming_control_pdu->ivi_nid = segmented_pdu->ivi_nid; 897 incoming_control_pdu->ctl_ttl = segmented_pdu->ctl_ttl; 898 incoming_control_pdu->seq = segmented_pdu->seq; 899 incoming_control_pdu->src = segmented_pdu->src; 900 incoming_control_pdu->dst = segmented_pdu->dst; 901 902 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 903 904 // free mesh message 905 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)segmented_pdu); 906 907 btstack_assert(mesh_control_message_handler != NULL); 908 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 909 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 910 911 } else { 912 913 incoming_access_encrypted = (mesh_pdu_t *) segmented_pdu; 914 915 incoming_access_decrypted = &incoming_pdu_singleton.access; 916 incoming_access_decrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 917 incoming_access_decrypted->flags = segmented_pdu->flags; 918 incoming_access_decrypted->len = segmented_pdu->len; 919 incoming_access_decrypted->netkey_index = segmented_pdu->netkey_index; 920 incoming_access_decrypted->akf_aid_control = segmented_pdu->akf_aid_control; 921 incoming_access_decrypted->ivi_nid = segmented_pdu->ivi_nid; 922 incoming_access_decrypted->ctl_ttl = segmented_pdu->ctl_ttl; 923 incoming_access_decrypted->seq = segmented_pdu->seq; 924 incoming_access_decrypted->src = segmented_pdu->src; 925 incoming_access_decrypted->dst = segmented_pdu->dst; 926 927 mesh_upper_transport_process_access_message(); 928 } 929 break; 930 default: 931 btstack_assert(0); 932 break; 933 } 934 } 935 936 btstack_linked_list_iterator_t it; 937 btstack_linked_list_iterator_init(&it, &upper_transport_outgoing); 938 while (btstack_linked_list_iterator_has_next(&it)){ 939 940 if (crypto_active) break; 941 942 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_iterator_next(&it); 943 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == false) { 944 // skip pdu for now 945 continue; 946 } 947 948 mesh_upper_transport_pdu_t * upper_pdu; 949 mesh_segmented_pdu_t * segmented_pdu; 950 uint8_t transmic_len; 951 bool ok; 952 bool abort_outgoing_loop = false; 953 954 switch (pdu->pdu_type){ 955 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 956 // control pdus can go through directly 957 btstack_assert(mesh_pdu_ctl(pdu) != 0); 958 btstack_linked_list_iterator_remove(&it); 959 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 960 break; 961 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 962 // control pdus can go through directly 963 btstack_assert(mesh_pdu_ctl(pdu) != 0); 964 btstack_linked_list_iterator_remove(&it); 965 mesh_upper_transport_send_segmented_control_pdu((mesh_upper_transport_pdu_t *) pdu); 966 break; 967 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 968 // segmented access pdus required a mesh-segmented-pdu 969 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 970 if (upper_pdu->lower_pdu == NULL){ 971 segmented_pdu = btstack_memory_mesh_segmented_pdu_get(); 972 } 973 if (segmented_pdu == NULL) { 974 mesh_upper_transport_need_pdu_for_run_outgoing(); 975 abort_outgoing_loop = true; 976 break; 977 } 978 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 979 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 980 // and a mesh-network-pdu for each segment in upper pdu 981 transmic_len = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 982 ok = mesh_segmented_allocate_segments(&segmented_pdu->segments, upper_pdu->len + transmic_len); 983 if (!ok) { 984 abort_outgoing_loop = true; 985 break; 986 } 987 // all buffers available, get started 988 btstack_linked_list_iterator_remove(&it); 989 mesh_upper_transport_send_access(upper_pdu); 990 break; 991 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 992 // unsegmented access pdus require a single mesh-network-dpu 993 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 994 if (upper_pdu->lower_pdu == NULL){ 995 upper_pdu->lower_pdu = (mesh_pdu_t *) mesh_network_pdu_get(); 996 } 997 if (upper_pdu->lower_pdu == NULL) { 998 mesh_upper_transport_need_pdu_for_run_outgoing(); 999 abort_outgoing_loop = true; 1000 break; 1001 } 1002 btstack_linked_list_iterator_remove(&it); 1003 mesh_upper_transport_send_access((mesh_upper_transport_pdu_t *) pdu); 1004 break; 1005 default: 1006 btstack_assert(false); 1007 break; 1008 } 1009 if (abort_outgoing_loop) { 1010 break; 1011 } 1012 } 1013 } 1014 1015 static mesh_upper_transport_pdu_t * mesh_upper_transport_find_and_remove_pdu_for_lower(mesh_pdu_t * pdu_to_find){ 1016 btstack_linked_list_iterator_t it; 1017 btstack_linked_list_iterator_init(&it, &upper_transport_outgoing_active); 1018 mesh_upper_transport_pdu_t * upper_pdu; 1019 while (btstack_linked_list_iterator_has_next(&it)){ 1020 mesh_pdu_t * mesh_pdu = (mesh_pdu_t *) btstack_linked_list_iterator_next(&it); 1021 switch (mesh_pdu->pdu_type){ 1022 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1023 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1024 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1025 upper_pdu = (mesh_upper_transport_pdu_t *) mesh_pdu; 1026 if (upper_pdu->lower_pdu == pdu_to_find){ 1027 btstack_linked_list_iterator_remove(&it); 1028 return upper_pdu; 1029 } 1030 break; 1031 default: 1032 break; 1033 } 1034 } 1035 return NULL; 1036 } 1037 1038 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 1039 mesh_upper_transport_pdu_t * upper_pdu; 1040 mesh_network_pdu_t * network_pdu; 1041 mesh_segmented_pdu_t * segmented_pdu; 1042 switch (callback_type){ 1043 case MESH_TRANSPORT_PDU_RECEIVED: 1044 mesh_upper_transport_message_received(pdu); 1045 break; 1046 case MESH_TRANSPORT_PDU_SENT: 1047 switch (pdu->pdu_type){ 1048 case MESH_PDU_TYPE_SEGMENTED: 1049 // try to find in outgoing active 1050 upper_pdu = mesh_upper_transport_find_and_remove_pdu_for_lower(pdu); 1051 btstack_assert(upper_pdu != NULL); 1052 segmented_pdu = (mesh_segmented_pdu_t *) pdu; 1053 // free chunks 1054 while (!btstack_linked_list_empty(&segmented_pdu->segments)){ 1055 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&segmented_pdu->segments); 1056 mesh_network_pdu_free(network_pdu); 1057 } 1058 // free segmented pdu 1059 btstack_memory_mesh_segmented_pdu_free(segmented_pdu); 1060 upper_pdu->lower_pdu = NULL; 1061 switch (upper_pdu->pdu_header.pdu_type){ 1062 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1063 mesh_control_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 1064 break; 1065 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1066 mesh_access_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 1067 break; 1068 default: 1069 btstack_assert(false); 1070 break; 1071 } 1072 break; 1073 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1074 // find corresponding upper transport pdu and free single segment 1075 upper_pdu = mesh_upper_transport_find_and_remove_pdu_for_lower(pdu); 1076 btstack_assert(upper_pdu != NULL); 1077 btstack_assert(upper_pdu->lower_pdu == (mesh_pdu_t *) pdu); 1078 mesh_network_pdu_free((mesh_network_pdu_t *) pdu); 1079 upper_pdu->lower_pdu = NULL; 1080 mesh_access_message_handler(callback_type, status, (mesh_pdu_t*) upper_pdu); 1081 break; 1082 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1083 mesh_access_message_handler(callback_type, status, pdu); 1084 break; 1085 default: 1086 btstack_assert(false); 1087 break; 1088 } 1089 mesh_upper_transport_run(); 1090 break; 1091 default: 1092 break; 1093 } 1094 } 1095 1096 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 1097 btstack_assert(pdu != NULL); 1098 mesh_network_pdu_t * network_pdu; 1099 mesh_segmented_pdu_t * message_pdu; 1100 mesh_upper_transport_pdu_t * upper_pdu; 1101 switch (pdu->pdu_type) { 1102 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1103 case MESH_PDU_TYPE_NETWORK: 1104 network_pdu = (mesh_network_pdu_t *) pdu; 1105 mesh_network_pdu_free(network_pdu); 1106 break; 1107 case MESH_PDU_TYPE_SEGMENTED: 1108 message_pdu = (mesh_segmented_pdu_t *) pdu; 1109 mesh_segmented_pdu_free(message_pdu); 1110 break; 1111 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1112 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1113 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1114 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 1115 while (upper_pdu->segments) { 1116 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_pop(&upper_pdu->segments); 1117 mesh_network_pdu_free(segment); 1118 } 1119 btstack_memory_mesh_upper_transport_pdu_free(upper_pdu); 1120 // check if send request can be handled now 1121 mesh_upper_transport_schedule_send_requests(); 1122 break; 1123 default: 1124 btstack_assert(false); 1125 break; 1126 } 1127 } 1128 1129 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 1130 crypto_active = 0; 1131 switch (pdu->pdu_type){ 1132 case MESH_PDU_TYPE_ACCESS: 1133 mesh_upper_transport_process_access_message_done((mesh_access_pdu_t *) pdu); 1134 case MESH_PDU_TYPE_CONTROL: 1135 mesh_upper_transport_process_control_message_done((mesh_control_pdu_t *) pdu); 1136 break; 1137 default: 1138 btstack_assert(0); 1139 break; 1140 } 1141 } 1142 1143 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 1144 switch (pdu->pdu_type){ 1145 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1146 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1147 break; 1148 default: 1149 btstack_assert(false); 1150 break; 1151 } 1152 1153 btstack_assert(((mesh_upper_transport_pdu_t *) pdu)->lower_pdu == NULL); 1154 1155 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1156 mesh_upper_transport_run(); 1157 } 1158 1159 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 1160 switch (pdu->pdu_type){ 1161 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1162 break; 1163 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1164 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 1165 break; 1166 default: 1167 btstack_assert(false); 1168 break; 1169 } 1170 1171 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1172 mesh_upper_transport_run(); 1173 } 1174 1175 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, 1176 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1177 1178 btstack_assert(network_pdu != NULL); 1179 btstack_assert(control_pdu_len <= 11); 1180 1181 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1182 if (!network_key) return 1; 1183 1184 uint8_t transport_pdu_data[12]; 1185 transport_pdu_data[0] = opcode; 1186 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 1187 uint16_t transport_pdu_len = control_pdu_len + 1; 1188 1189 // setup network_pdu 1190 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL; 1191 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 1192 1193 return 0; 1194 } 1195 1196 uint8_t mesh_upper_transport_setup_segmented_control_pdu_header(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode){ 1197 1198 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1199 if (!network_key) return 1; 1200 1201 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1202 upper_pdu->ctl_ttl = ttl; 1203 upper_pdu->src = src; 1204 upper_pdu->dst = dest; 1205 upper_pdu->netkey_index = netkey_index; 1206 upper_pdu->akf_aid_control = opcode; 1207 return 0; 1208 } 1209 1210 static uint8_t mesh_upper_transport_setup_upper_access_pdu_header(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, 1211 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1212 1213 // get app or device key 1214 const mesh_transport_key_t *appkey; 1215 appkey = mesh_transport_key_get(appkey_index); 1216 if (appkey == NULL) { 1217 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 1218 return 1; 1219 } 1220 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1221 1222 // lookup network by netkey_index 1223 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 1224 if (!network_key) return 1; 1225 if (network_key == NULL) { 1226 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 1227 return 1; 1228 } 1229 1230 // store in transport pdu 1231 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1232 upper_pdu->ctl_ttl = ttl; 1233 upper_pdu->src = src; 1234 upper_pdu->dst = dest; 1235 upper_pdu->netkey_index = netkey_index; 1236 upper_pdu->appkey_index = appkey_index; 1237 upper_pdu->akf_aid_control = akf_aid; 1238 if (szmic) { 1239 upper_pdu->flags |= MESH_TRANSPORT_FLAG_TRANSMIC_64; 1240 } 1241 return 0; 1242 } 1243 1244 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 1245 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1246 switch (pdu->pdu_type){ 1247 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1248 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1249 return mesh_upper_transport_setup_upper_access_pdu_header((mesh_upper_transport_pdu_t *) pdu, netkey_index, 1250 appkey_index, ttl, src, dest, szmic); 1251 default: 1252 btstack_assert(false); 1253 return 1; 1254 } 1255 } 1256 1257 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)) { 1258 mesh_access_message_handler = callback; 1259 } 1260 1261 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)){ 1262 mesh_control_message_handler = callback; 1263 } 1264 1265 void mesh_upper_transport_init(){ 1266 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1267 } 1268 1269 bool mesh_upper_transport_message_reserve(void){ 1270 if (message_builder_reserved_upper_pdu == NULL){ 1271 message_builder_reserved_upper_pdu = btstack_memory_mesh_upper_transport_pdu_get(); 1272 } 1273 if (message_builder_reserved_upper_pdu == NULL){ 1274 return false; 1275 } 1276 while (message_builder_num_network_pdus_reserved < MESSAGE_BUILDER_MAX_NUM_NETWORK_PDUS){ 1277 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 1278 if (network_pdu == NULL){ 1279 return false; 1280 } 1281 btstack_linked_list_add(&message_builder_reserved_network_pdus, (btstack_linked_item_t *) network_pdu); 1282 message_builder_num_network_pdus_reserved++; 1283 } 1284 return true; 1285 } 1286 1287 void mesh_upper_transport_message_init(mesh_upper_transport_builder_t * builder, mesh_pdu_type_t pdu_type) { 1288 btstack_assert(builder != NULL); 1289 1290 // use reserved buffer if available 1291 if (message_builder_reserved_upper_pdu != NULL){ 1292 builder->pdu = message_builder_reserved_upper_pdu; 1293 message_builder_reserved_upper_pdu = NULL; 1294 } else { 1295 builder->pdu = btstack_memory_mesh_upper_transport_pdu_get(); 1296 } 1297 if (!builder->pdu) return; 1298 1299 builder->segment = NULL; 1300 builder->pdu->pdu_header.pdu_type = pdu_type; 1301 builder->pdu->ack_opcode = MESH_ACCESS_OPCODE_NOT_SET; 1302 } 1303 1304 1305 void mesh_upper_transport_message_add_data(mesh_upper_transport_builder_t * builder, const uint8_t * data, uint16_t data_len){ 1306 btstack_assert(builder != NULL); 1307 1308 if (builder->pdu == NULL) return; 1309 1310 builder->pdu->len += data_len; 1311 1312 uint16_t bytes_current_segment = 0; 1313 if (builder->segment){ 1314 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX - builder->segment->len; 1315 } 1316 while (data_len > 0){ 1317 if (bytes_current_segment == 0){ 1318 // use reserved buffer if available 1319 if (message_builder_num_network_pdus_reserved > 0){ 1320 message_builder_num_network_pdus_reserved--; 1321 builder->segment = (mesh_network_pdu_t *) btstack_linked_list_pop(&message_builder_reserved_network_pdus); 1322 } else { 1323 builder->segment = (mesh_network_pdu_t *) mesh_network_pdu_get(); 1324 } 1325 if (builder->segment == NULL) { 1326 mesh_upper_transport_pdu_free((mesh_pdu_t *) builder->pdu); 1327 builder->pdu = NULL; 1328 return; 1329 } 1330 btstack_linked_list_add_tail(&builder->pdu->segments, (btstack_linked_item_t *) builder->segment); 1331 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX; 1332 } 1333 uint16_t bytes_to_copy = btstack_min(bytes_current_segment, data_len); 1334 (void) memcpy(&builder->segment->data[builder->segment->len], data, bytes_to_copy); 1335 builder->segment->len += bytes_to_copy; 1336 bytes_current_segment -= bytes_to_copy; 1337 data += bytes_to_copy; 1338 data_len -= bytes_to_copy; 1339 } 1340 } 1341 1342 void mesh_upper_transport_message_add_uint8(mesh_upper_transport_builder_t * builder, uint8_t value){ 1343 mesh_upper_transport_message_add_data(builder, &value, 1); 1344 } 1345 1346 void mesh_upper_transport_message_add_uint16(mesh_upper_transport_builder_t * builder, uint16_t value){ 1347 uint8_t buffer[2]; 1348 little_endian_store_16(buffer, 0, value); 1349 mesh_upper_transport_message_add_data(builder, buffer, sizeof(buffer)); 1350 } 1351 1352 void mesh_upper_transport_message_add_uint24(mesh_upper_transport_builder_t * builder, uint32_t value){ 1353 uint8_t buffer[3]; 1354 little_endian_store_24(buffer, 0, value); 1355 mesh_upper_transport_message_add_data(builder, buffer, sizeof(buffer)); 1356 } 1357 1358 void mesh_upper_transport_message_add_uint32(mesh_upper_transport_builder_t * builder, uint32_t value){ 1359 uint8_t buffer[4]; 1360 little_endian_store_32(buffer, 0, value); 1361 mesh_upper_transport_message_add_data(builder, buffer, sizeof(buffer)); 1362 } 1363 1364 mesh_upper_transport_pdu_t * mesh_upper_transport_message_finalize(mesh_upper_transport_builder_t * builder){ 1365 return builder->pdu; 1366 } 1367