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 BLUEKITCHEN 24 * GMBH 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 <inttypes.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "btstack_bool.h" 46 #include "btstack_tlv.h" 47 #include "btstack_util.h" 48 #include "btstack_memory.h" 49 #include "btstack_debug.h" 50 51 #include "mesh/mesh_foundation.h" 52 #include "mesh_upper_transport.h" 53 #include "mesh/mesh_iv_index_seq_number.h" 54 #include "mesh/mesh_keys.h" 55 #include "mesh/mesh_lower_transport.h" 56 #include "mesh/mesh_peer.h" 57 #include "mesh/mesh_virtual_addresses.h" 58 59 // TODO: extract mesh_pdu functions into lower transport or network 60 #include "mesh/mesh_access.h" 61 62 // MESH_ACCESS_MESH_NETWORK_PAYLOAD_MAX (384) / MESH_NETWORK_PAYLOAD_MAX (29) = 13.24.. < 14 63 #define MESSAGE_BUILDER_MAX_NUM_NETWORK_PDUS (14) 64 65 // combined key x address iterator for upper transport decryption 66 67 typedef struct { 68 // state 69 mesh_transport_key_iterator_t key_it; 70 mesh_virtual_address_iterator_t address_it; 71 // elements 72 const mesh_transport_key_t * key; 73 const mesh_virtual_address_t * address; 74 // address - might be virtual 75 uint16_t dst; 76 // key info 77 } mesh_transport_key_and_virtual_address_iterator_t; 78 79 static void mesh_upper_transport_run(void); 80 static void mesh_upper_transport_schedule_send_requests(void); 81 static void mesh_upper_transport_validate_access_message(void); 82 83 // upper transport callbacks - in access layer 84 static void (*mesh_access_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 85 static void (*mesh_control_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 86 87 // 88 static int crypto_active; 89 static uint8_t application_nonce[13]; 90 static btstack_crypto_ccm_t ccm; 91 static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; 92 93 // incoming segmented (mesh_segmented_pdu_t) or unsegmented (network_pdu_t) 94 static mesh_pdu_t * incoming_access_encrypted; 95 96 // multi-purpose union: segmented control reassembly, decrypted access pdu 97 static union { 98 mesh_control_pdu_t control; 99 mesh_access_pdu_t access; 100 } incoming_pdu_singleton; 101 102 // pointer to incoming_pdu_singleton.access 103 static mesh_access_pdu_t * incoming_access_decrypted; 104 105 // pointer to incoming_pdu_singleton.access 106 static mesh_control_pdu_t * incoming_control_pdu; 107 108 // incoming incoming_access_decrypted ready to be deliverd 109 static bool incoming_access_pdu_ready; 110 111 // incoming unsegmented (network) and segmented (transport) control and access messages 112 static btstack_linked_list_t upper_transport_incoming; 113 114 115 // outgoing unsegmented and segmented control and access messages 116 static btstack_linked_list_t upper_transport_outgoing; 117 118 // outgoing upper transport messages that have been sent to lower transport and wait for sent event 119 static btstack_linked_list_t upper_transport_outgoing_active; 120 121 // outgoing send requests 122 static btstack_linked_list_t upper_transport_send_requests; 123 124 // message builder buffers 125 static mesh_upper_transport_pdu_t * message_builder_reserved_upper_pdu; 126 static uint8_t message_builder_num_network_pdus_reserved; 127 static btstack_linked_list_t message_builder_reserved_network_pdus; 128 129 // requets network pdus for outgoing send requests and outgoing run 130 static bool upper_transport_need_pdu_for_send_requests; 131 static bool upper_transport_need_pdu_for_run_outgoing; 132 133 // TODO: higher layer define used for assert 134 #define MESH_ACCESS_OPCODE_NOT_SET 0xFFFFFFFEu 135 136 static void mesh_print_hex(const char * name, const uint8_t * data, uint16_t len){ 137 printf("%-20s ", name); 138 printf_hexdump(data, len); 139 } 140 // static void mesh_print_x(const char * name, uint32_t value){ 141 // printf("%20s: 0x%x", name, (int) value); 142 // } 143 144 static void mesh_transport_key_and_virtual_address_iterator_init(mesh_transport_key_and_virtual_address_iterator_t *it, 145 uint16_t dst, uint16_t netkey_index, uint8_t akf, 146 uint8_t aid) { 147 printf("KEY_INIT: dst %04x, akf %x, aid %x\n", dst, akf, aid); 148 // config 149 it->dst = dst; 150 // init elements 151 it->key = NULL; 152 it->address = NULL; 153 // init element iterators 154 mesh_transport_key_aid_iterator_init(&it->key_it, netkey_index, akf, aid); 155 // init address iterator 156 if (mesh_network_address_virtual(it->dst)){ 157 mesh_virtual_address_iterator_init(&it->address_it, dst); 158 // get first key 159 if (mesh_transport_key_aid_iterator_has_more(&it->key_it)) { 160 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 161 } 162 } 163 } 164 165 // cartesian product: keys x addressses 166 static int mesh_transport_key_and_virtual_address_iterator_has_more(mesh_transport_key_and_virtual_address_iterator_t * it){ 167 if (mesh_network_address_virtual(it->dst)) { 168 // find next valid entry 169 while (true){ 170 if (mesh_virtual_address_iterator_has_more(&it->address_it)) return 1; 171 if (!mesh_transport_key_aid_iterator_has_more(&it->key_it)) return 0; 172 // get next key 173 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 174 mesh_virtual_address_iterator_init(&it->address_it, it->dst); 175 } 176 } else { 177 return mesh_transport_key_aid_iterator_has_more(&it->key_it); 178 } 179 } 180 181 static void mesh_transport_key_and_virtual_address_iterator_next(mesh_transport_key_and_virtual_address_iterator_t * it){ 182 if (mesh_network_address_virtual(it->dst)) { 183 it->address = mesh_virtual_address_iterator_get_next(&it->address_it); 184 } else { 185 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 186 } 187 } 188 189 // UPPER TRANSPORT 190 191 static void mesh_segmented_pdu_flatten(btstack_linked_list_t * segments, uint8_t segment_len, uint8_t * buffer) { 192 // assemble payload 193 btstack_linked_list_iterator_t it; 194 btstack_linked_list_iterator_init(&it, segments); 195 while (btstack_linked_list_iterator_has_next(&it)) { 196 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 197 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 198 uint8_t offset = 0; 199 while (offset < segment->len){ 200 uint8_t seg_o = segment->data[offset++]; 201 (void) memcpy(&buffer[seg_o * segment_len], &segment->data[offset], segment_len); 202 offset += segment_len; 203 } 204 } 205 } 206 207 static uint16_t mesh_upper_pdu_flatten(mesh_upper_transport_pdu_t * upper_pdu, uint8_t * buffer, uint16_t buffer_len) { 208 // assemble payload 209 btstack_linked_list_iterator_t it; 210 btstack_linked_list_iterator_init(&it, &upper_pdu->segments); 211 uint16_t offset = 0; 212 while (btstack_linked_list_iterator_has_next(&it)) { 213 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 214 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 215 btstack_assert((offset + segment->len) <= buffer_len); 216 (void) memcpy(&buffer[offset], segment->data, segment->len); 217 offset += segment->len; 218 } 219 return offset; 220 } 221 222 // store payload in provided list of network pdus 223 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){ 224 uint16_t payload_offset = 0; 225 uint16_t bytes_current_segment = 0; 226 mesh_network_pdu_t * network_pdu = NULL; 227 while (payload_offset < payload_len){ 228 if (bytes_current_segment == 0){ 229 network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(in_segments); 230 btstack_assert(network_pdu != NULL); 231 btstack_linked_list_add_tail(out_segments, (btstack_linked_item_t *) network_pdu); 232 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX; 233 } 234 uint16_t bytes_to_copy = btstack_min(bytes_current_segment, payload_len - payload_offset); 235 (void) memcpy(&network_pdu->data[network_pdu->len], &payload[payload_offset], bytes_to_copy); 236 bytes_current_segment -= bytes_to_copy; 237 238 // on enter, bytes_current_segment = 0 => network_pdu = pop (in segements) + assert (network != NULL) 239 // cppcheck-suppress nullPointer 240 network_pdu->len += bytes_to_copy; 241 payload_offset += bytes_to_copy; 242 } 243 } 244 245 // tries allocate and add enough segments to store payload of given size 246 static bool mesh_segmented_allocate_segments(btstack_linked_list_t * segments, uint16_t payload_len){ 247 uint16_t storage_size = btstack_linked_list_count(segments) * MESH_NETWORK_PAYLOAD_MAX; 248 while (storage_size < payload_len){ 249 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 250 if (network_pdu == NULL) break; 251 storage_size += MESH_NETWORK_PAYLOAD_MAX; 252 btstack_linked_list_add(segments, (btstack_linked_item_t *) network_pdu); 253 } 254 return (storage_size >= payload_len); 255 } 256 257 // stub lower transport 258 259 static void mesh_upper_transport_dump_pdus(const char *name, btstack_linked_list_t *list){ 260 printf("List: %s:\n", name); 261 btstack_linked_list_iterator_t it; 262 btstack_linked_list_iterator_init(&it, list); 263 while (btstack_linked_list_iterator_has_next(&it)){ 264 mesh_pdu_t * pdu = (mesh_pdu_t*) btstack_linked_list_iterator_next(&it); 265 printf("- %p\n", pdu); 266 // printf_hexdump( mesh_pdu_data(pdu), mesh_pdu_len(pdu)); 267 } 268 } 269 270 static void mesh_upper_transport_reset_pdus(btstack_linked_list_t *list){ 271 while (!btstack_linked_list_empty(list)){ 272 mesh_upper_transport_pdu_free((mesh_pdu_t *) btstack_linked_list_pop(list)); 273 } 274 } 275 276 void mesh_upper_transport_dump(void){ 277 mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); 278 } 279 280 void mesh_upper_transport_reset(void){ 281 crypto_active = 0; 282 mesh_upper_transport_reset_pdus(&upper_transport_incoming); 283 mesh_upper_transport_reset_pdus(&upper_transport_outgoing); 284 message_builder_num_network_pdus_reserved = 0; 285 mesh_upper_transport_reset_pdus(&message_builder_reserved_network_pdus); 286 if (message_builder_reserved_upper_pdu != NULL){ 287 btstack_memory_mesh_upper_transport_pdu_free(message_builder_reserved_upper_pdu); 288 message_builder_reserved_upper_pdu = NULL; 289 } 290 } 291 292 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 293 // Device Key is fixed 294 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 295 return mesh_transport_key_get(appkey_index); 296 } 297 298 // Get key refresh state from subnet 299 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 300 if (subnet == NULL) return NULL; 301 302 // identify old and new app keys for given appkey_index 303 mesh_transport_key_t * old_key = NULL; 304 mesh_transport_key_t * new_key = NULL; 305 mesh_transport_key_iterator_t it; 306 mesh_transport_key_iterator_init(&it, netkey_index); 307 while (mesh_transport_key_iterator_has_more(&it)){ 308 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 309 if (transport_key->appkey_index != appkey_index) continue; 310 if (transport_key->old_key == 0) { 311 new_key = transport_key; 312 } else { 313 old_key = transport_key; 314 } 315 } 316 317 // if no key is marked as old, just use the current one 318 if (old_key == NULL) return new_key; 319 320 // use new key if it exists in phase two 321 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 322 return new_key; 323 } else { 324 return old_key; 325 } 326 } 327 328 static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ 329 // get IV Index and IVI 330 uint32_t iv_index = mesh_get_iv_index(); 331 int ivi = ivi_nid >> 7; 332 333 // if least significant bit differs, use previous IV Index 334 if ((iv_index & 1 ) ^ ivi){ 335 iv_index--; 336 } 337 return iv_index; 338 } 339 340 static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 341 mesh_access_pdu_t * access_pdu; 342 mesh_upper_transport_pdu_t * upper_pdu; 343 switch (pdu->pdu_type){ 344 case MESH_PDU_TYPE_ACCESS: 345 access_pdu = (mesh_access_pdu_t *) pdu; 346 nonce[1] = ((access_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 0x80 : 0x00; 347 big_endian_store_24(nonce, 2, access_pdu->seq); 348 big_endian_store_16(nonce, 5, access_pdu->src); 349 big_endian_store_16(nonce, 7, access_pdu->dst); 350 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(access_pdu->ivi_nid)); 351 break; 352 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 353 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 354 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 355 nonce[1] = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 0x80 : 0x00; 356 // 'network header' 357 big_endian_store_24(nonce, 2, upper_pdu->seq); 358 big_endian_store_16(nonce, 5, upper_pdu->src); 359 big_endian_store_16(nonce, 7, upper_pdu->dst); 360 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(upper_pdu->ivi_nid)); 361 break; 362 default: 363 btstack_assert(0); 364 break; 365 } 366 } 367 368 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 369 nonce[0] = 0x01; 370 transport_segmented_setup_nonce(nonce, pdu); 371 mesh_print_hex("AppNonce", nonce, 13); 372 } 373 374 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 375 nonce[0] = 0x02; 376 transport_segmented_setup_nonce(nonce, pdu); 377 mesh_print_hex("DeviceNonce", nonce, 13); 378 } 379 380 static void mesh_upper_transport_process_access_message_done(mesh_access_pdu_t *access_pdu){ 381 crypto_active = 0; 382 btstack_assert((access_pdu->ctl_ttl & 0x80) == 0); 383 mesh_lower_transport_message_processed_by_higher_layer(incoming_access_encrypted); 384 incoming_access_encrypted = NULL; 385 incoming_access_decrypted = NULL; 386 mesh_upper_transport_run(); 387 } 388 389 static void mesh_upper_transport_process_control_message_done(mesh_control_pdu_t * control_pdu){ 390 UNUSED(control_pdu); 391 crypto_active = 0; 392 incoming_control_pdu = NULL; 393 mesh_upper_transport_run(); 394 } 395 396 static void mesh_upper_transport_network_pdu_freed(void){ 397 // call both while prioritizing run outgoing 398 // both functions will trigger request for network pdu if needed 399 if (upper_transport_need_pdu_for_run_outgoing){ 400 upper_transport_need_pdu_for_run_outgoing = false; 401 mesh_upper_transport_run(); 402 } 403 if (upper_transport_need_pdu_for_send_requests){ 404 upper_transport_need_pdu_for_send_requests = false; 405 mesh_upper_transport_schedule_send_requests(); 406 } 407 } 408 409 static void mesh_upper_transport_need_pdu_for_send_requests(void) { 410 bool waiting = upper_transport_need_pdu_for_send_requests || upper_transport_need_pdu_for_run_outgoing; 411 upper_transport_need_pdu_for_send_requests = true; 412 if (waiting == false) { 413 mesh_network_notify_on_freed_pdu(&mesh_upper_transport_network_pdu_freed); 414 } 415 } 416 static void mesh_upper_transport_need_pdu_for_run_outgoing(void) { 417 bool waiting = upper_transport_need_pdu_for_send_requests || upper_transport_need_pdu_for_run_outgoing; 418 upper_transport_need_pdu_for_run_outgoing = true; 419 if (waiting == false) { 420 mesh_network_notify_on_freed_pdu(&mesh_upper_transport_network_pdu_freed); 421 } 422 } 423 424 static void mesh_upper_transport_deliver_access_message(void) { 425 incoming_access_pdu_ready = false; 426 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t *) incoming_access_decrypted); 427 } 428 429 static bool mesh_upper_transport_send_requests_pending(void){ 430 if (incoming_access_pdu_ready) { 431 return true; 432 } 433 return btstack_linked_list_empty(&upper_transport_send_requests) == false; 434 } 435 436 static void mesh_upper_transport_schedule_send_requests(void){ 437 438 while (mesh_upper_transport_send_requests_pending()){ 439 440 // get ready 441 bool message_builder_ready = mesh_upper_transport_message_reserve(); 442 443 if (message_builder_ready == false){ 444 // waiting for free upper pdu, we will get called again on pdu free 445 if (message_builder_reserved_upper_pdu == NULL){ 446 return; 447 } 448 // request callback on network pdu free 449 mesh_upper_transport_need_pdu_for_send_requests(); 450 return; 451 } 452 453 // process send requests 454 455 // incoming access pdu 456 if (incoming_access_pdu_ready){ 457 // message builder ready = one outgoing pdu is guaranteed, deliver access pdu 458 mesh_upper_transport_deliver_access_message(); 459 continue; 460 } 461 462 // regular send request 463 btstack_context_callback_registration_t * send_request = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&upper_transport_send_requests); 464 btstack_assert(send_request != NULL); 465 (*send_request->callback)(send_request->context); 466 } 467 } 468 469 void mesh_upper_transport_request_to_send(btstack_context_callback_registration_t * request){ 470 btstack_linked_list_add_tail(&upper_transport_send_requests, (btstack_linked_item_t *) request); 471 mesh_upper_transport_schedule_send_requests(); 472 } 473 474 static void mesh_upper_transport_validate_access_message_ccm(void * arg){ 475 UNUSED(arg); 476 477 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 478 uint8_t * upper_transport_pdu = incoming_access_decrypted->data; 479 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 480 481 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 482 483 // store TransMIC 484 uint8_t trans_mic[8]; 485 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 486 mesh_print_hex("TransMIC", trans_mic, transmic_len); 487 488 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], transmic_len) == 0){ 489 printf("TransMIC matches\n"); 490 491 // remove TransMIC from payload 492 incoming_access_decrypted->len -= transmic_len; 493 494 // if virtual address, update dst to pseudo_dst 495 if (mesh_network_address_virtual(incoming_access_decrypted->dst)){ 496 incoming_access_decrypted->dst = mesh_transport_key_it.address->pseudo_dst; 497 } 498 499 // pass to upper layer 500 incoming_access_pdu_ready = true; 501 mesh_upper_transport_schedule_send_requests(); 502 503 } else { 504 uint8_t akf = incoming_access_decrypted->akf_aid_control & 0x40; 505 if (akf){ 506 printf("TransMIC does not match, try next key\n"); 507 mesh_upper_transport_validate_access_message(); 508 } else { 509 printf("TransMIC does not match device key, done\n"); 510 // done 511 mesh_upper_transport_process_access_message_done(incoming_access_decrypted); 512 } 513 } 514 } 515 516 static void mesh_upper_transport_validate_access_message_digest(void * arg){ 517 UNUSED(arg); 518 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 519 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 520 uint8_t * upper_transport_pdu_data_out = incoming_access_decrypted->data; 521 522 mesh_network_pdu_t * unsegmented_pdu = NULL; 523 mesh_segmented_pdu_t * segmented_pdu = NULL; 524 switch (incoming_access_encrypted->pdu_type){ 525 case MESH_PDU_TYPE_SEGMENTED: 526 segmented_pdu = (mesh_segmented_pdu_t *) incoming_access_encrypted; 527 mesh_segmented_pdu_flatten(&segmented_pdu->segments, 12, upper_transport_pdu_data_out); 528 mesh_print_hex("Encrypted Payload:", upper_transport_pdu_data_out, upper_transport_pdu_len); 529 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_out, upper_transport_pdu_data_out, 530 &mesh_upper_transport_validate_access_message_ccm, NULL); 531 break; 532 case MESH_PDU_TYPE_UNSEGMENTED: 533 unsegmented_pdu = (mesh_network_pdu_t *) incoming_access_encrypted; 534 (void)memcpy(upper_transport_pdu_data_out, &unsegmented_pdu->data[10], incoming_access_decrypted->len); 535 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_out, upper_transport_pdu_data_out, 536 &mesh_upper_transport_validate_access_message_ccm, NULL); 537 break; 538 default: 539 btstack_assert(false); 540 break; 541 } 542 543 } 544 545 static void mesh_upper_transport_validate_access_message(void){ 546 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 547 uint8_t * upper_transport_pdu_data = incoming_access_decrypted->data; 548 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 549 550 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 551 printf("No valid transport key found\n"); 552 mesh_upper_transport_process_access_message_done(incoming_access_decrypted); 553 return; 554 } 555 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 556 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 557 558 if (message_key->akf){ 559 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) incoming_access_decrypted); 560 } else { 561 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) incoming_access_decrypted); 562 } 563 564 // store application / device key index 565 mesh_print_hex("AppOrDevKey", message_key->key, 16); 566 incoming_access_decrypted->appkey_index = message_key->appkey_index; 567 568 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 569 570 // decrypt ccm 571 crypto_active = 1; 572 uint16_t aad_len = 0; 573 if (mesh_network_address_virtual(incoming_access_decrypted->dst)){ 574 aad_len = 16; 575 } 576 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, transmic_len); 577 578 if (aad_len){ 579 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, 580 &mesh_upper_transport_validate_access_message_digest, NULL); 581 } else { 582 mesh_upper_transport_validate_access_message_digest(NULL); 583 } 584 } 585 586 static void mesh_upper_transport_process_access_message(void){ 587 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 588 uint8_t * upper_transport_pdu = incoming_access_decrypted->data; 589 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 590 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 591 592 uint8_t aid = incoming_access_decrypted->akf_aid_control & 0x3f; 593 uint8_t akf = (incoming_access_decrypted->akf_aid_control & 0x40) >> 6; 594 595 printf("AKF: %u\n", akf); 596 printf("AID: %02x\n", aid); 597 598 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, incoming_access_decrypted->dst, 599 incoming_access_decrypted->netkey_index, akf, aid); 600 mesh_upper_transport_validate_access_message(); 601 } 602 603 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 604 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 605 mesh_upper_transport_run(); 606 } 607 608 static void mesh_upper_transport_send_access_segmented(mesh_upper_transport_pdu_t * upper_pdu){ 609 610 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 611 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 612 613 // convert mesh_access_pdu_t into mesh_segmented_pdu_t 614 btstack_linked_list_t free_segments = segmented_pdu->segments; 615 segmented_pdu->segments = NULL; 616 mesh_segmented_store_payload(incoming_pdu_singleton.access.data, upper_pdu->len, &free_segments, &segmented_pdu->segments); 617 618 // copy meta 619 segmented_pdu->len = upper_pdu->len; 620 segmented_pdu->netkey_index = upper_pdu->netkey_index; 621 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 622 segmented_pdu->flags = upper_pdu->flags; 623 624 // setup segmented_pdu header 625 // (void)memcpy(segmented_pdu->network_header, upper_pdu->network_header, 9); 626 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 627 segmented_pdu->ivi_nid = upper_pdu->ivi_nid; 628 segmented_pdu->ctl_ttl = upper_pdu->ctl_ttl; 629 segmented_pdu->seq = upper_pdu->seq; 630 segmented_pdu->src = upper_pdu->src; 631 segmented_pdu->dst = upper_pdu->dst; 632 633 // queue up 634 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 635 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 636 637 mesh_lower_transport_send_pdu((mesh_pdu_t*) segmented_pdu); 638 } 639 640 static void mesh_upper_transport_send_access_unsegmented(mesh_upper_transport_pdu_t * upper_pdu){ 641 642 // provide segment 643 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) upper_pdu->lower_pdu; 644 645 // setup network pdu 646 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS; 647 network_pdu->data[0] = upper_pdu->ivi_nid; 648 network_pdu->data[1] = upper_pdu->ctl_ttl; 649 big_endian_store_24(network_pdu->data, 2, upper_pdu->seq); 650 big_endian_store_16(network_pdu->data, 5, upper_pdu->src); 651 big_endian_store_16(network_pdu->data, 7, upper_pdu->dst); 652 network_pdu->netkey_index = upper_pdu->netkey_index; 653 654 // setup access message 655 network_pdu->data[9] = upper_pdu->akf_aid_control; 656 btstack_assert(upper_pdu->len < 15); 657 (void)memcpy(&network_pdu->data[10], &incoming_pdu_singleton.access.data, upper_pdu->len); 658 network_pdu->len = 10 + upper_pdu->len; 659 network_pdu->flags = 0; 660 661 // queue up 662 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 663 664 mesh_lower_transport_send_pdu((mesh_pdu_t*) network_pdu); 665 } 666 667 static void mesh_upper_transport_send_access_ccm(void * arg){ 668 crypto_active = 0; 669 670 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 671 mesh_print_hex("EncAccessPayload", incoming_pdu_singleton.access.data, upper_pdu->len); 672 // store TransMIC 673 btstack_crypto_ccm_get_authentication_value(&ccm, &incoming_pdu_singleton.access.data[upper_pdu->len]); 674 uint8_t transmic_len = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 675 mesh_print_hex("TransMIC", &incoming_pdu_singleton.access.data[upper_pdu->len], transmic_len); 676 upper_pdu->len += transmic_len; 677 mesh_print_hex("UpperTransportPDU", incoming_pdu_singleton.access.data, upper_pdu->len); 678 switch (upper_pdu->pdu_header.pdu_type){ 679 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 680 mesh_upper_transport_send_access_unsegmented(upper_pdu); 681 break; 682 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 683 mesh_upper_transport_send_access_segmented(upper_pdu); 684 break; 685 default: 686 btstack_assert(false); 687 } 688 } 689 690 static void mesh_upper_transport_send_access_digest(void *arg){ 691 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 692 uint16_t access_pdu_len = upper_pdu->len; 693 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, incoming_pdu_singleton.access.data, incoming_pdu_singleton.access.data, 694 &mesh_upper_transport_send_access_ccm, upper_pdu); 695 } 696 697 static void mesh_upper_transport_send_access(mesh_upper_transport_pdu_t * upper_pdu){ 698 699 // if dst is virtual address, lookup label uuid and hash 700 uint16_t aad_len = 0; 701 mesh_virtual_address_t * virtual_address = NULL; 702 if (mesh_network_address_virtual(upper_pdu->dst)){ 703 virtual_address = mesh_virtual_address_for_pseudo_dst(upper_pdu->dst); 704 if (!virtual_address){ 705 printf("No virtual address register for pseudo dst %4x\n", upper_pdu->dst); 706 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 707 return; 708 } 709 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 710 // printf_hexdump(virtual_address->label_uuid, 16); 711 aad_len = 16; 712 upper_pdu->dst = virtual_address->hash; 713 } 714 715 // get app or device key 716 uint16_t appkey_index = upper_pdu->appkey_index; 717 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(upper_pdu->netkey_index, appkey_index); 718 if (appkey == NULL){ 719 printf("AppKey %04x not found, drop message\n", appkey_index); 720 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 721 return; 722 } 723 724 // reserve slot 725 mesh_lower_transport_reserve_slot(); 726 727 // reserve one sequence number, which is also used to encrypt access payload 728 uint32_t seq = mesh_sequence_number_next(); 729 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 730 upper_pdu->seq = seq; 731 732 // also reserves crypto_buffer 733 crypto_active = 1; 734 735 // flatten segmented pdu into crypto buffer 736 uint16_t payload_len = mesh_upper_pdu_flatten(upper_pdu, incoming_pdu_singleton.access.data, sizeof(incoming_pdu_singleton.access.data)); 737 btstack_assert(payload_len == upper_pdu->len); 738 UNUSED(payload_len); 739 740 // Dump PDU 741 printf("[+] Upper transport, send upper (un)segmented Access PDU - dest %04x, seq %06" PRIx32 "\n", upper_pdu->dst, upper_pdu->seq); 742 mesh_print_hex("Access Payload", incoming_pdu_singleton.access.data, upper_pdu->len); 743 744 // setup nonce - uses dst, so after pseudo address translation 745 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 746 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 747 } else { 748 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 749 } 750 751 // Dump key 752 mesh_print_hex("AppOrDevKey", appkey->key, 16); 753 754 // encrypt ccm 755 uint8_t transmic_len = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 756 uint16_t access_pdu_len = upper_pdu->len; 757 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 758 if (virtual_address){ 759 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 760 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, 761 &mesh_upper_transport_send_access_digest, upper_pdu); 762 } else { 763 mesh_upper_transport_send_access_digest(upper_pdu); 764 } 765 } 766 767 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 768 // reserve slot 769 mesh_lower_transport_reserve_slot(); 770 // reserve sequence number 771 uint32_t seq = mesh_sequence_number_next(); 772 mesh_network_pdu_set_seq(network_pdu, seq); 773 // Dump PDU 774 uint8_t opcode = network_pdu->data[9]; 775 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06" PRIx32 " opcode %02x\n", network_pdu, seq, opcode); 776 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 777 778 // send 779 mesh_lower_transport_send_pdu((mesh_pdu_t *) network_pdu); 780 } 781 782 static void mesh_upper_transport_send_segmented_control_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 783 // reserve slot 784 mesh_lower_transport_reserve_slot(); 785 // reserve sequence number 786 uint32_t seq = mesh_sequence_number_next(); 787 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 788 upper_pdu->seq = seq; 789 // Dump PDU 790 // uint8_t opcode = upper_pdu->data[0]; 791 // printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", upper_pdu, seq, opcode); 792 // mesh_print_hex("Access Payload", &upper_pdu->data[1], upper_pdu->len - 1); 793 // send 794 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 795 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 796 797 // lend segments to lower transport pdu 798 segmented_pdu->segments = upper_pdu->segments; 799 upper_pdu->segments = NULL; 800 801 // copy meta 802 segmented_pdu->len = upper_pdu->len; 803 segmented_pdu->netkey_index = upper_pdu->netkey_index; 804 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 805 segmented_pdu->flags = upper_pdu->flags; 806 807 btstack_assert((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) == 0); 808 809 // setup segmented_pdu header 810 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 811 segmented_pdu->ivi_nid = upper_pdu->ivi_nid; 812 segmented_pdu->ctl_ttl = upper_pdu->ctl_ttl; 813 segmented_pdu->seq = upper_pdu->seq; 814 segmented_pdu->src = upper_pdu->src; 815 segmented_pdu->dst = upper_pdu->dst; 816 817 // queue up 818 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 819 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 820 821 mesh_lower_transport_send_pdu((mesh_pdu_t *) segmented_pdu); 822 } 823 824 static void mesh_upper_transport_run(void){ 825 826 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 827 828 if (crypto_active) return; 829 830 // get next message 831 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(&upper_transport_incoming); 832 mesh_network_pdu_t * network_pdu; 833 mesh_segmented_pdu_t * segmented_pdu; 834 switch (pdu->pdu_type){ 835 case MESH_PDU_TYPE_UNSEGMENTED: 836 network_pdu = (mesh_network_pdu_t *) pdu; 837 // control? 838 if (mesh_network_control(network_pdu)) { 839 840 incoming_control_pdu = &incoming_pdu_singleton.control; 841 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 842 incoming_control_pdu->len = network_pdu->len; 843 incoming_control_pdu->netkey_index = network_pdu->netkey_index; 844 845 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 846 847 incoming_control_pdu->akf_aid_control = lower_transport_pdu[0]; 848 incoming_control_pdu->len = network_pdu->len - 10; // 9 header + 1 opcode 849 (void)memcpy(incoming_control_pdu->data, &lower_transport_pdu[1], incoming_control_pdu->len); 850 851 // copy meta data into encrypted pdu buffer 852 incoming_control_pdu->ivi_nid = network_pdu->data[0]; 853 incoming_control_pdu->ctl_ttl = network_pdu->data[1]; 854 incoming_control_pdu->seq = big_endian_read_24(network_pdu->data, 2); 855 incoming_control_pdu->src = big_endian_read_16(network_pdu->data, 5); 856 incoming_control_pdu->dst = big_endian_read_16(network_pdu->data, 7); 857 858 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 859 860 // free mesh message 861 mesh_lower_transport_message_processed_by_higher_layer(pdu); 862 863 btstack_assert(mesh_control_message_handler != NULL); 864 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t*) incoming_control_pdu); 865 866 } else { 867 868 incoming_access_encrypted = (mesh_pdu_t *) network_pdu; 869 870 incoming_access_decrypted = &incoming_pdu_singleton.access; 871 incoming_access_decrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 872 incoming_access_decrypted->flags = 0; 873 incoming_access_decrypted->netkey_index = network_pdu->netkey_index; 874 incoming_access_decrypted->akf_aid_control = network_pdu->data[9]; 875 incoming_access_decrypted->len = network_pdu->len - 10; // 9 header + 1 AID 876 incoming_access_decrypted->ivi_nid = network_pdu->data[0]; 877 incoming_access_decrypted->ctl_ttl = network_pdu->data[1]; 878 incoming_access_decrypted->seq = big_endian_read_24(network_pdu->data, 2); 879 incoming_access_decrypted->src = big_endian_read_16(network_pdu->data, 5); 880 incoming_access_decrypted->dst = big_endian_read_16(network_pdu->data, 7); 881 882 mesh_upper_transport_process_access_message(); 883 } 884 break; 885 case MESH_PDU_TYPE_SEGMENTED: 886 segmented_pdu = (mesh_segmented_pdu_t *) pdu; 887 uint8_t ctl = segmented_pdu->ctl_ttl >> 7; 888 if (ctl){ 889 incoming_control_pdu= &incoming_pdu_singleton.control; 890 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 891 892 // flatten 893 mesh_segmented_pdu_flatten(&segmented_pdu->segments, 8, incoming_control_pdu->data); 894 895 // copy meta data into encrypted pdu buffer 896 incoming_control_pdu->flags = 0; 897 incoming_control_pdu->len = segmented_pdu->len; 898 incoming_control_pdu->netkey_index = segmented_pdu->netkey_index; 899 incoming_control_pdu->akf_aid_control = segmented_pdu->akf_aid_control; 900 incoming_control_pdu->ivi_nid = segmented_pdu->ivi_nid; 901 incoming_control_pdu->ctl_ttl = segmented_pdu->ctl_ttl; 902 incoming_control_pdu->seq = segmented_pdu->seq; 903 incoming_control_pdu->src = segmented_pdu->src; 904 incoming_control_pdu->dst = segmented_pdu->dst; 905 906 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 907 908 // free mesh message 909 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)segmented_pdu); 910 911 btstack_assert(mesh_control_message_handler != NULL); 912 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t*) incoming_control_pdu); 913 914 } else { 915 916 incoming_access_encrypted = (mesh_pdu_t *) segmented_pdu; 917 918 incoming_access_decrypted = &incoming_pdu_singleton.access; 919 incoming_access_decrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 920 incoming_access_decrypted->flags = segmented_pdu->flags; 921 incoming_access_decrypted->len = segmented_pdu->len; 922 incoming_access_decrypted->netkey_index = segmented_pdu->netkey_index; 923 incoming_access_decrypted->akf_aid_control = segmented_pdu->akf_aid_control; 924 incoming_access_decrypted->ivi_nid = segmented_pdu->ivi_nid; 925 incoming_access_decrypted->ctl_ttl = segmented_pdu->ctl_ttl; 926 incoming_access_decrypted->seq = segmented_pdu->seq; 927 incoming_access_decrypted->src = segmented_pdu->src; 928 incoming_access_decrypted->dst = segmented_pdu->dst; 929 930 mesh_upper_transport_process_access_message(); 931 } 932 break; 933 default: 934 btstack_assert(0); 935 break; 936 } 937 } 938 939 btstack_linked_list_iterator_t it; 940 btstack_linked_list_iterator_init(&it, &upper_transport_outgoing); 941 while (btstack_linked_list_iterator_has_next(&it)){ 942 943 if (crypto_active) break; 944 945 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_iterator_next(&it); 946 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == false) { 947 // skip pdu for now 948 continue; 949 } 950 951 mesh_upper_transport_pdu_t * upper_pdu; 952 mesh_segmented_pdu_t * segmented_pdu; 953 uint8_t transmic_len; 954 bool ok; 955 bool abort_outgoing_loop = false; 956 957 switch (pdu->pdu_type){ 958 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 959 // control pdus can go through directly 960 btstack_assert(mesh_pdu_ctl(pdu) != 0); 961 btstack_linked_list_iterator_remove(&it); 962 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 963 break; 964 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 965 // control pdus can go through directly 966 btstack_assert(mesh_pdu_ctl(pdu) != 0); 967 btstack_linked_list_iterator_remove(&it); 968 mesh_upper_transport_send_segmented_control_pdu((mesh_upper_transport_pdu_t *) pdu); 969 break; 970 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 971 // segmented access pdus required a mesh-segmented-pdu 972 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 973 if (upper_pdu->lower_pdu == NULL){ 974 upper_pdu->lower_pdu = (mesh_pdu_t *) btstack_memory_mesh_segmented_pdu_get(); 975 } 976 if (upper_pdu->lower_pdu == NULL){ 977 mesh_upper_transport_need_pdu_for_run_outgoing(); 978 abort_outgoing_loop = true; 979 break; 980 } 981 segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 982 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 983 // and a mesh-network-pdu for each segment in upper pdu 984 transmic_len = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 985 ok = mesh_segmented_allocate_segments(&segmented_pdu->segments, upper_pdu->len + transmic_len); 986 if (!ok) { 987 abort_outgoing_loop = true; 988 break; 989 } 990 // all buffers available, get started 991 btstack_linked_list_iterator_remove(&it); 992 mesh_upper_transport_send_access(upper_pdu); 993 break; 994 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 995 // unsegmented access pdus require a single mesh-network-dpu 996 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 997 if (upper_pdu->lower_pdu == NULL){ 998 upper_pdu->lower_pdu = (mesh_pdu_t *) mesh_network_pdu_get(); 999 } 1000 if (upper_pdu->lower_pdu == NULL) { 1001 mesh_upper_transport_need_pdu_for_run_outgoing(); 1002 abort_outgoing_loop = true; 1003 break; 1004 } 1005 btstack_linked_list_iterator_remove(&it); 1006 mesh_upper_transport_send_access((mesh_upper_transport_pdu_t *) pdu); 1007 break; 1008 default: 1009 btstack_assert(false); 1010 break; 1011 } 1012 if (abort_outgoing_loop) { 1013 break; 1014 } 1015 } 1016 } 1017 1018 static mesh_upper_transport_pdu_t * mesh_upper_transport_find_and_remove_pdu_for_lower(mesh_pdu_t * pdu_to_find){ 1019 btstack_linked_list_iterator_t it; 1020 btstack_linked_list_iterator_init(&it, &upper_transport_outgoing_active); 1021 mesh_upper_transport_pdu_t * upper_pdu; 1022 while (btstack_linked_list_iterator_has_next(&it)){ 1023 mesh_pdu_t * mesh_pdu = (mesh_pdu_t *) btstack_linked_list_iterator_next(&it); 1024 switch (mesh_pdu->pdu_type){ 1025 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1026 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1027 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1028 upper_pdu = (mesh_upper_transport_pdu_t *) mesh_pdu; 1029 if (upper_pdu->lower_pdu == pdu_to_find){ 1030 btstack_linked_list_iterator_remove(&it); 1031 return upper_pdu; 1032 } 1033 break; 1034 default: 1035 break; 1036 } 1037 } 1038 return NULL; 1039 } 1040 1041 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 1042 mesh_upper_transport_pdu_t * upper_pdu; 1043 mesh_segmented_pdu_t * segmented_pdu; 1044 switch (callback_type){ 1045 case MESH_TRANSPORT_PDU_RECEIVED: 1046 mesh_upper_transport_message_received(pdu); 1047 break; 1048 case MESH_TRANSPORT_PDU_SENT: 1049 switch (pdu->pdu_type){ 1050 case MESH_PDU_TYPE_SEGMENTED: 1051 // try to find in outgoing active 1052 upper_pdu = mesh_upper_transport_find_and_remove_pdu_for_lower(pdu); 1053 btstack_assert(upper_pdu != NULL); 1054 segmented_pdu = (mesh_segmented_pdu_t *) pdu; 1055 // free chunks 1056 while (!btstack_linked_list_empty(&segmented_pdu->segments)){ 1057 mesh_network_pdu_t * chunk_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&segmented_pdu->segments); 1058 mesh_network_pdu_free(chunk_pdu); 1059 } 1060 // free segmented pdu 1061 btstack_memory_mesh_segmented_pdu_free(segmented_pdu); 1062 upper_pdu->lower_pdu = NULL; 1063 switch (upper_pdu->pdu_header.pdu_type){ 1064 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1065 mesh_control_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 1066 break; 1067 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1068 mesh_access_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 1069 break; 1070 default: 1071 btstack_assert(false); 1072 break; 1073 } 1074 break; 1075 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1076 // find corresponding upper transport pdu and free single segment 1077 upper_pdu = mesh_upper_transport_find_and_remove_pdu_for_lower(pdu); 1078 btstack_assert(upper_pdu != NULL); 1079 btstack_assert(upper_pdu->lower_pdu == (mesh_pdu_t *) pdu); 1080 mesh_network_pdu_free((mesh_network_pdu_t *) pdu); 1081 upper_pdu->lower_pdu = NULL; 1082 mesh_access_message_handler(callback_type, status, (mesh_pdu_t*) upper_pdu); 1083 break; 1084 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1085 mesh_access_message_handler(callback_type, status, pdu); 1086 break; 1087 default: 1088 btstack_assert(false); 1089 break; 1090 } 1091 mesh_upper_transport_run(); 1092 break; 1093 default: 1094 break; 1095 } 1096 } 1097 1098 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 1099 btstack_assert(pdu != NULL); 1100 mesh_network_pdu_t * network_pdu; 1101 mesh_segmented_pdu_t * message_pdu; 1102 mesh_upper_transport_pdu_t * upper_pdu; 1103 switch (pdu->pdu_type) { 1104 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1105 case MESH_PDU_TYPE_NETWORK: 1106 network_pdu = (mesh_network_pdu_t *) pdu; 1107 mesh_network_pdu_free(network_pdu); 1108 break; 1109 case MESH_PDU_TYPE_SEGMENTED: 1110 message_pdu = (mesh_segmented_pdu_t *) pdu; 1111 mesh_segmented_pdu_free(message_pdu); 1112 break; 1113 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1114 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1115 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1116 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 1117 while (upper_pdu->segments) { 1118 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_pop(&upper_pdu->segments); 1119 mesh_network_pdu_free(segment); 1120 } 1121 btstack_memory_mesh_upper_transport_pdu_free(upper_pdu); 1122 // check if send request can be handled now 1123 mesh_upper_transport_schedule_send_requests(); 1124 break; 1125 default: 1126 btstack_assert(false); 1127 break; 1128 } 1129 } 1130 1131 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 1132 crypto_active = 0; 1133 switch (pdu->pdu_type){ 1134 case MESH_PDU_TYPE_ACCESS: 1135 mesh_upper_transport_process_access_message_done((mesh_access_pdu_t *) pdu); 1136 break; 1137 case MESH_PDU_TYPE_CONTROL: 1138 mesh_upper_transport_process_control_message_done((mesh_control_pdu_t *) pdu); 1139 break; 1140 default: 1141 btstack_assert(0); 1142 break; 1143 } 1144 } 1145 1146 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 1147 switch (pdu->pdu_type){ 1148 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1149 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1150 break; 1151 default: 1152 btstack_assert(false); 1153 break; 1154 } 1155 1156 btstack_assert(((mesh_upper_transport_pdu_t *) pdu)->lower_pdu == NULL); 1157 1158 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1159 mesh_upper_transport_run(); 1160 } 1161 1162 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 1163 switch (pdu->pdu_type){ 1164 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1165 break; 1166 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1167 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 1168 break; 1169 default: 1170 btstack_assert(false); 1171 break; 1172 } 1173 1174 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1175 mesh_upper_transport_run(); 1176 } 1177 1178 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, 1179 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1180 1181 btstack_assert(network_pdu != NULL); 1182 btstack_assert(control_pdu_len <= 11); 1183 1184 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1185 if (!network_key) return 1; 1186 1187 uint8_t transport_pdu_data[12]; 1188 transport_pdu_data[0] = opcode; 1189 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 1190 uint16_t transport_pdu_len = control_pdu_len + 1; 1191 1192 // setup network_pdu 1193 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL; 1194 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 1195 1196 return 0; 1197 } 1198 1199 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){ 1200 1201 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1202 if (!network_key) return 1; 1203 1204 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1205 upper_pdu->ctl_ttl = ttl; 1206 upper_pdu->src = src; 1207 upper_pdu->dst = dest; 1208 upper_pdu->netkey_index = netkey_index; 1209 upper_pdu->akf_aid_control = opcode; 1210 return 0; 1211 } 1212 1213 static uint8_t mesh_upper_transport_setup_upper_access_pdu_header(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, 1214 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1215 1216 // get app or device key 1217 const mesh_transport_key_t *appkey; 1218 appkey = mesh_transport_key_get(appkey_index); 1219 if (appkey == NULL) { 1220 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 1221 return 1; 1222 } 1223 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1224 1225 // lookup network by netkey_index 1226 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 1227 if (!network_key) return 1; 1228 if (network_key == NULL) { 1229 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 1230 return 1; 1231 } 1232 1233 // store in transport pdu 1234 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1235 upper_pdu->ctl_ttl = ttl; 1236 upper_pdu->src = src; 1237 upper_pdu->dst = dest; 1238 upper_pdu->netkey_index = netkey_index; 1239 upper_pdu->appkey_index = appkey_index; 1240 upper_pdu->akf_aid_control = akf_aid; 1241 if (szmic) { 1242 upper_pdu->flags |= MESH_TRANSPORT_FLAG_TRANSMIC_64; 1243 } 1244 return 0; 1245 } 1246 1247 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 1248 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1249 switch (pdu->pdu_type){ 1250 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1251 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1252 return mesh_upper_transport_setup_upper_access_pdu_header((mesh_upper_transport_pdu_t *) pdu, netkey_index, 1253 appkey_index, ttl, src, dest, szmic); 1254 default: 1255 btstack_assert(false); 1256 return 1; 1257 } 1258 } 1259 1260 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)) { 1261 mesh_access_message_handler = callback; 1262 } 1263 1264 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)){ 1265 mesh_control_message_handler = callback; 1266 } 1267 1268 void mesh_upper_transport_init(){ 1269 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1270 } 1271 1272 bool mesh_upper_transport_message_reserve(void){ 1273 if (message_builder_reserved_upper_pdu == NULL){ 1274 message_builder_reserved_upper_pdu = btstack_memory_mesh_upper_transport_pdu_get(); 1275 } 1276 if (message_builder_reserved_upper_pdu == NULL){ 1277 return false; 1278 } 1279 while (message_builder_num_network_pdus_reserved < MESSAGE_BUILDER_MAX_NUM_NETWORK_PDUS){ 1280 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 1281 if (network_pdu == NULL){ 1282 return false; 1283 } 1284 btstack_linked_list_add(&message_builder_reserved_network_pdus, (btstack_linked_item_t *) network_pdu); 1285 message_builder_num_network_pdus_reserved++; 1286 } 1287 return true; 1288 } 1289 1290 void mesh_upper_transport_message_init(mesh_upper_transport_builder_t * builder, mesh_pdu_type_t pdu_type) { 1291 btstack_assert(builder != NULL); 1292 1293 // use reserved buffer if available 1294 if (message_builder_reserved_upper_pdu != NULL){ 1295 builder->pdu = message_builder_reserved_upper_pdu; 1296 message_builder_reserved_upper_pdu = NULL; 1297 } else { 1298 builder->pdu = btstack_memory_mesh_upper_transport_pdu_get(); 1299 } 1300 if (!builder->pdu) return; 1301 1302 builder->segment = NULL; 1303 builder->pdu->pdu_header.pdu_type = pdu_type; 1304 builder->pdu->ack_opcode = MESH_ACCESS_OPCODE_NOT_SET; 1305 } 1306 1307 1308 void mesh_upper_transport_message_add_data(mesh_upper_transport_builder_t * builder, const uint8_t * data, uint16_t data_len){ 1309 btstack_assert(builder != NULL); 1310 1311 if (builder->pdu == NULL) return; 1312 1313 builder->pdu->len += data_len; 1314 1315 uint16_t bytes_current_segment = 0; 1316 if (builder->segment){ 1317 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX - builder->segment->len; 1318 } 1319 while (data_len > 0){ 1320 if (bytes_current_segment == 0){ 1321 // use reserved buffer if available 1322 if (message_builder_num_network_pdus_reserved > 0){ 1323 message_builder_num_network_pdus_reserved--; 1324 builder->segment = (mesh_network_pdu_t *) btstack_linked_list_pop(&message_builder_reserved_network_pdus); 1325 } else { 1326 builder->segment = (mesh_network_pdu_t *) mesh_network_pdu_get(); 1327 } 1328 if (builder->segment == NULL) { 1329 mesh_upper_transport_pdu_free((mesh_pdu_t *) builder->pdu); 1330 builder->pdu = NULL; 1331 return; 1332 } 1333 btstack_linked_list_add_tail(&builder->pdu->segments, (btstack_linked_item_t *) builder->segment); 1334 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX; 1335 } 1336 uint16_t bytes_to_copy = btstack_min(bytes_current_segment, data_len); 1337 (void) memcpy(&builder->segment->data[builder->segment->len], data, bytes_to_copy); 1338 builder->segment->len += bytes_to_copy; 1339 bytes_current_segment -= bytes_to_copy; 1340 data += bytes_to_copy; 1341 data_len -= bytes_to_copy; 1342 } 1343 } 1344 1345 void mesh_upper_transport_message_add_uint8(mesh_upper_transport_builder_t * builder, uint8_t value){ 1346 mesh_upper_transport_message_add_data(builder, &value, 1); 1347 } 1348 1349 void mesh_upper_transport_message_add_uint16(mesh_upper_transport_builder_t * builder, uint16_t value){ 1350 uint8_t buffer[2]; 1351 little_endian_store_16(buffer, 0, value); 1352 mesh_upper_transport_message_add_data(builder, buffer, sizeof(buffer)); 1353 } 1354 1355 void mesh_upper_transport_message_add_uint24(mesh_upper_transport_builder_t * builder, uint32_t value){ 1356 uint8_t buffer[3]; 1357 little_endian_store_24(buffer, 0, value); 1358 mesh_upper_transport_message_add_data(builder, buffer, sizeof(buffer)); 1359 } 1360 1361 void mesh_upper_transport_message_add_uint32(mesh_upper_transport_builder_t * builder, uint32_t value){ 1362 uint8_t buffer[4]; 1363 little_endian_store_32(buffer, 0, value); 1364 mesh_upper_transport_message_add_data(builder, buffer, sizeof(buffer)); 1365 } 1366 1367 mesh_upper_transport_pdu_t * mesh_upper_transport_message_finalize(mesh_upper_transport_builder_t * builder){ 1368 return builder->pdu; 1369 } 1370