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 mesh_upper_transport_reset_pdus(&upper_transport_outgoing); 288 message_builder_num_network_pdus_reserved = 0; 289 mesh_upper_transport_reset_pdus(&message_builder_reserved_network_pdus); 290 if (message_builder_reserved_upper_pdu != NULL){ 291 btstack_memory_mesh_upper_transport_pdu_free(message_builder_reserved_upper_pdu); 292 message_builder_reserved_upper_pdu = NULL; 293 } 294 } 295 296 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 297 // Device Key is fixed 298 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 299 return mesh_transport_key_get(appkey_index); 300 } 301 302 // Get key refresh state from subnet 303 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 304 if (subnet == NULL) return NULL; 305 306 // identify old and new app keys for given appkey_index 307 mesh_transport_key_t * old_key = NULL; 308 mesh_transport_key_t * new_key = NULL; 309 mesh_transport_key_iterator_t it; 310 mesh_transport_key_iterator_init(&it, netkey_index); 311 while (mesh_transport_key_iterator_has_more(&it)){ 312 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 313 if (transport_key->appkey_index != appkey_index) continue; 314 if (transport_key->old_key == 0) { 315 new_key = transport_key; 316 } else { 317 old_key = transport_key; 318 } 319 } 320 321 // if no key is marked as old, just use the current one 322 if (old_key == NULL) return new_key; 323 324 // use new key if it exists in phase two 325 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 326 return new_key; 327 } else { 328 return old_key; 329 } 330 } 331 332 static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ 333 // get IV Index and IVI 334 uint32_t iv_index = mesh_get_iv_index(); 335 int ivi = ivi_nid >> 7; 336 337 // if least significant bit differs, use previous IV Index 338 if ((iv_index & 1 ) ^ ivi){ 339 iv_index--; 340 } 341 return iv_index; 342 } 343 344 static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 345 mesh_access_pdu_t * access_pdu; 346 mesh_upper_transport_pdu_t * upper_pdu; 347 switch (pdu->pdu_type){ 348 case MESH_PDU_TYPE_ACCESS: 349 access_pdu = (mesh_access_pdu_t *) pdu; 350 nonce[1] = ((access_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 0x80 : 0x00; 351 big_endian_store_24(nonce, 2, access_pdu->seq); 352 big_endian_store_16(nonce, 5, access_pdu->src); 353 big_endian_store_16(nonce, 7, access_pdu->dst); 354 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(access_pdu->ivi_nid)); 355 break; 356 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 357 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 358 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 359 nonce[1] = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 0x80 : 0x00; 360 // 'network header' 361 big_endian_store_24(nonce, 2, upper_pdu->seq); 362 big_endian_store_16(nonce, 5, upper_pdu->src); 363 big_endian_store_16(nonce, 7, upper_pdu->dst); 364 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(upper_pdu->ivi_nid)); 365 break; 366 default: 367 btstack_assert(0); 368 break; 369 } 370 } 371 372 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 373 nonce[0] = 0x01; 374 transport_segmented_setup_nonce(nonce, pdu); 375 mesh_print_hex("AppNonce", nonce, 13); 376 } 377 378 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 379 nonce[0] = 0x02; 380 transport_segmented_setup_nonce(nonce, pdu); 381 mesh_print_hex("DeviceNonce", nonce, 13); 382 } 383 384 static void mesh_upper_transport_process_access_message_done(mesh_access_pdu_t *access_pdu){ 385 crypto_active = 0; 386 btstack_assert((access_pdu->ctl_ttl & 0x80) == 0); 387 mesh_lower_transport_message_processed_by_higher_layer(incoming_access_encrypted); 388 incoming_access_encrypted = NULL; 389 incoming_access_decrypted = NULL; 390 mesh_upper_transport_run(); 391 } 392 393 static void mesh_upper_transport_process_control_message_done(mesh_control_pdu_t * control_pdu){ 394 UNUSED(control_pdu); 395 crypto_active = 0; 396 incoming_control_pdu = NULL; 397 mesh_upper_transport_run(); 398 } 399 400 static void mesh_upper_transport_network_pdu_freed(void){ 401 // call both while prioritizing run outgoing 402 // both functions will trigger request for network pdu if needed 403 if (upper_transport_need_pdu_for_run_outgoing){ 404 upper_transport_need_pdu_for_run_outgoing = false; 405 mesh_upper_transport_run(); 406 } 407 if (upper_transport_need_pdu_for_send_requests){ 408 upper_transport_need_pdu_for_send_requests = false; 409 mesh_upper_transport_schedule_send_requests(); 410 } 411 } 412 413 static void mesh_upper_transport_need_pdu_for_send_requests(void) { 414 bool waiting = upper_transport_need_pdu_for_send_requests || upper_transport_need_pdu_for_run_outgoing; 415 upper_transport_need_pdu_for_send_requests = true; 416 if (waiting == false) { 417 mesh_network_notify_on_freed_pdu(&mesh_upper_transport_network_pdu_freed); 418 } 419 } 420 static void mesh_upper_transport_need_pdu_for_run_outgoing(void) { 421 bool waiting = upper_transport_need_pdu_for_send_requests || upper_transport_need_pdu_for_run_outgoing; 422 upper_transport_need_pdu_for_run_outgoing = true; 423 if (waiting == false) { 424 mesh_network_notify_on_freed_pdu(&mesh_upper_transport_network_pdu_freed); 425 } 426 } 427 428 static void mesh_upper_transport_deliver_access_message(void) { 429 incoming_access_pdu_ready = false; 430 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t *) incoming_access_decrypted); 431 } 432 433 static bool mesh_upper_transport_send_requests_pending(void){ 434 if (incoming_access_pdu_ready) { 435 return true; 436 } 437 return btstack_linked_list_empty(&upper_transport_send_requests) == false; 438 } 439 440 static void mesh_upper_transport_schedule_send_requests(void){ 441 442 while (mesh_upper_transport_send_requests_pending()){ 443 444 // get ready 445 bool message_builder_ready = mesh_upper_transport_message_reserve(); 446 447 if (message_builder_ready == false){ 448 // waiting for free upper pdu, we will get called again on pdu free 449 if (message_builder_reserved_upper_pdu == NULL){ 450 return; 451 } 452 // request callback on network pdu free 453 mesh_upper_transport_need_pdu_for_send_requests(); 454 return; 455 } 456 457 // process send requests 458 459 // incoming access pdu 460 if (incoming_access_pdu_ready){ 461 // message builder ready = one outgoing pdu is guaranteed, deliver access pdu 462 mesh_upper_transport_deliver_access_message(); 463 continue; 464 } 465 466 // regular send request 467 btstack_context_callback_registration_t * send_request = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&upper_transport_send_requests); 468 btstack_assert(send_request != NULL); 469 (*send_request->callback)(send_request->context); 470 } 471 } 472 473 void mesh_upper_transport_request_to_send(btstack_context_callback_registration_t * request){ 474 btstack_linked_list_add_tail(&upper_transport_send_requests, (btstack_linked_item_t *) request); 475 mesh_upper_transport_schedule_send_requests(); 476 } 477 478 static void mesh_upper_transport_validate_access_message_ccm(void * arg){ 479 UNUSED(arg); 480 481 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 482 uint8_t * upper_transport_pdu = incoming_access_decrypted->data; 483 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 484 485 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 486 487 // store TransMIC 488 uint8_t trans_mic[8]; 489 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 490 mesh_print_hex("TransMIC", trans_mic, transmic_len); 491 492 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], transmic_len) == 0){ 493 printf("TransMIC matches\n"); 494 495 // remove TransMIC from payload 496 incoming_access_decrypted->len -= transmic_len; 497 498 // if virtual address, update dst to pseudo_dst 499 if (mesh_network_address_virtual(incoming_access_decrypted->dst)){ 500 incoming_access_decrypted->dst = mesh_transport_key_it.address->pseudo_dst; 501 } 502 503 // pass to upper layer 504 incoming_access_pdu_ready = true; 505 mesh_upper_transport_schedule_send_requests(); 506 507 } else { 508 uint8_t akf = incoming_access_decrypted->akf_aid_control & 0x40; 509 if (akf){ 510 printf("TransMIC does not match, try next key\n"); 511 mesh_upper_transport_validate_access_message(); 512 } else { 513 printf("TransMIC does not match device key, done\n"); 514 // done 515 mesh_upper_transport_process_access_message_done(incoming_access_decrypted); 516 } 517 } 518 } 519 520 static void mesh_upper_transport_validate_access_message_digest(void * arg){ 521 UNUSED(arg); 522 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 523 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 524 uint8_t * upper_transport_pdu_data_out = incoming_access_decrypted->data; 525 526 mesh_network_pdu_t * unsegmented_pdu = NULL; 527 mesh_segmented_pdu_t * segmented_pdu = NULL; 528 switch (incoming_access_encrypted->pdu_type){ 529 case MESH_PDU_TYPE_SEGMENTED: 530 segmented_pdu = (mesh_segmented_pdu_t *) incoming_access_encrypted; 531 mesh_segmented_pdu_flatten(&segmented_pdu->segments, 12, upper_transport_pdu_data_out); 532 mesh_print_hex("Encrypted Payload:", upper_transport_pdu_data_out, upper_transport_pdu_len); 533 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_out, upper_transport_pdu_data_out, 534 &mesh_upper_transport_validate_access_message_ccm, NULL); 535 break; 536 case MESH_PDU_TYPE_UNSEGMENTED: 537 unsegmented_pdu = (mesh_network_pdu_t *) incoming_access_encrypted; 538 (void)memcpy(upper_transport_pdu_data_out, &unsegmented_pdu->data[10], incoming_access_decrypted->len); 539 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_out, upper_transport_pdu_data_out, 540 &mesh_upper_transport_validate_access_message_ccm, NULL); 541 break; 542 default: 543 btstack_assert(false); 544 break; 545 } 546 547 } 548 549 static void mesh_upper_transport_validate_access_message(void){ 550 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 551 uint8_t * upper_transport_pdu_data = incoming_access_decrypted->data; 552 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 553 554 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 555 printf("No valid transport key found\n"); 556 mesh_upper_transport_process_access_message_done(incoming_access_decrypted); 557 return; 558 } 559 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 560 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 561 562 if (message_key->akf){ 563 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) incoming_access_decrypted); 564 } else { 565 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) incoming_access_decrypted); 566 } 567 568 // store application / device key index 569 mesh_print_hex("AppOrDevKey", message_key->key, 16); 570 incoming_access_decrypted->appkey_index = message_key->appkey_index; 571 572 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 573 574 // decrypt ccm 575 crypto_active = 1; 576 uint16_t aad_len = 0; 577 if (mesh_network_address_virtual(incoming_access_decrypted->dst)){ 578 aad_len = 16; 579 } 580 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, transmic_len); 581 582 if (aad_len){ 583 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, 584 &mesh_upper_transport_validate_access_message_digest, NULL); 585 } else { 586 mesh_upper_transport_validate_access_message_digest(NULL); 587 } 588 } 589 590 static void mesh_upper_transport_process_access_message(void){ 591 uint8_t transmic_len = ((incoming_access_decrypted->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 592 uint8_t * upper_transport_pdu = incoming_access_decrypted->data; 593 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - transmic_len; 594 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 595 596 uint8_t aid = incoming_access_decrypted->akf_aid_control & 0x3f; 597 uint8_t akf = (incoming_access_decrypted->akf_aid_control & 0x40) >> 6; 598 599 printf("AKF: %u\n", akf); 600 printf("AID: %02x\n", aid); 601 602 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, incoming_access_decrypted->dst, 603 incoming_access_decrypted->netkey_index, akf, aid); 604 mesh_upper_transport_validate_access_message(); 605 } 606 607 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 608 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 609 mesh_upper_transport_run(); 610 } 611 612 static void mesh_upper_transport_send_access_segmented(mesh_upper_transport_pdu_t * upper_pdu){ 613 614 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 615 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 616 617 // convert mesh_access_pdu_t into mesh_segmented_pdu_t 618 btstack_linked_list_t free_segments = segmented_pdu->segments; 619 segmented_pdu->segments = NULL; 620 mesh_segmented_store_payload(incoming_pdu_singleton.access.data, upper_pdu->len, &free_segments, &segmented_pdu->segments); 621 622 // copy meta 623 segmented_pdu->len = upper_pdu->len; 624 segmented_pdu->netkey_index = upper_pdu->netkey_index; 625 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 626 segmented_pdu->flags = upper_pdu->flags; 627 628 // setup segmented_pdu header 629 // (void)memcpy(segmented_pdu->network_header, upper_pdu->network_header, 9); 630 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 631 segmented_pdu->ivi_nid = upper_pdu->ivi_nid; 632 segmented_pdu->ctl_ttl = upper_pdu->ctl_ttl; 633 segmented_pdu->seq = upper_pdu->seq; 634 segmented_pdu->src = upper_pdu->src; 635 segmented_pdu->dst = upper_pdu->dst; 636 637 // queue up 638 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 639 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 640 641 mesh_lower_transport_send_pdu((mesh_pdu_t*) segmented_pdu); 642 } 643 644 static void mesh_upper_transport_send_access_unsegmented(mesh_upper_transport_pdu_t * upper_pdu){ 645 646 // provide segment 647 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) upper_pdu->lower_pdu; 648 649 // setup network pdu 650 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS; 651 network_pdu->data[0] = upper_pdu->ivi_nid; 652 network_pdu->data[1] = upper_pdu->ctl_ttl; 653 big_endian_store_24(network_pdu->data, 2, upper_pdu->seq); 654 big_endian_store_16(network_pdu->data, 5, upper_pdu->src); 655 big_endian_store_16(network_pdu->data, 7, upper_pdu->dst); 656 network_pdu->netkey_index = upper_pdu->netkey_index; 657 658 // setup access message 659 network_pdu->data[9] = upper_pdu->akf_aid_control; 660 btstack_assert(upper_pdu->len < 15); 661 (void)memcpy(&network_pdu->data[10], &incoming_pdu_singleton.access.data, upper_pdu->len); 662 network_pdu->len = 10 + upper_pdu->len; 663 network_pdu->flags = 0; 664 665 // queue up 666 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 667 668 mesh_lower_transport_send_pdu((mesh_pdu_t*) network_pdu); 669 } 670 671 static void mesh_upper_transport_send_access_ccm(void * arg){ 672 crypto_active = 0; 673 674 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 675 mesh_print_hex("EncAccessPayload", incoming_pdu_singleton.access.data, upper_pdu->len); 676 // store TransMIC 677 btstack_crypto_ccm_get_authentication_value(&ccm, &incoming_pdu_singleton.access.data[upper_pdu->len]); 678 uint8_t transmic_len = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 679 mesh_print_hex("TransMIC", &incoming_pdu_singleton.access.data[upper_pdu->len], transmic_len); 680 upper_pdu->len += transmic_len; 681 mesh_print_hex("UpperTransportPDU", incoming_pdu_singleton.access.data, upper_pdu->len); 682 switch (upper_pdu->pdu_header.pdu_type){ 683 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 684 mesh_upper_transport_send_access_unsegmented(upper_pdu); 685 break; 686 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 687 mesh_upper_transport_send_access_segmented(upper_pdu); 688 break; 689 default: 690 btstack_assert(false); 691 } 692 } 693 694 static void mesh_upper_transport_send_access_digest(void *arg){ 695 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 696 uint16_t access_pdu_len = upper_pdu->len; 697 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, incoming_pdu_singleton.access.data, incoming_pdu_singleton.access.data, 698 &mesh_upper_transport_send_access_ccm, upper_pdu); 699 } 700 701 static void mesh_upper_transport_send_access(mesh_upper_transport_pdu_t * upper_pdu){ 702 703 // if dst is virtual address, lookup label uuid and hash 704 uint16_t aad_len = 0; 705 mesh_virtual_address_t * virtual_address = NULL; 706 if (mesh_network_address_virtual(upper_pdu->dst)){ 707 virtual_address = mesh_virtual_address_for_pseudo_dst(upper_pdu->dst); 708 if (!virtual_address){ 709 printf("No virtual address register for pseudo dst %4x\n", upper_pdu->dst); 710 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 711 return; 712 } 713 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 714 // printf_hexdump(virtual_address->label_uuid, 16); 715 aad_len = 16; 716 upper_pdu->dst = virtual_address->hash; 717 } 718 719 // get app or device key 720 uint16_t appkey_index = upper_pdu->appkey_index; 721 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(upper_pdu->netkey_index, appkey_index); 722 if (appkey == NULL){ 723 printf("AppKey %04x not found, drop message\n", appkey_index); 724 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 725 return; 726 } 727 728 // reserve slot 729 mesh_lower_transport_reserve_slot(); 730 731 // reserve one sequence number, which is also used to encrypt access payload 732 uint32_t seq = mesh_sequence_number_next(); 733 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 734 upper_pdu->seq = seq; 735 736 // also reserves crypto_buffer 737 crypto_active = 1; 738 739 // flatten segmented pdu into crypto buffer 740 uint16_t payload_len = mesh_upper_pdu_flatten(upper_pdu, incoming_pdu_singleton.access.data, sizeof(incoming_pdu_singleton.access.data)); 741 btstack_assert(payload_len == upper_pdu->len); 742 UNUSED(payload_len); 743 744 // Dump PDU 745 printf("[+] Upper transport, send upper (un)segmented Access PDU - dest %04x, seq %06x\n", upper_pdu->dst, upper_pdu->seq); 746 mesh_print_hex("Access Payload", incoming_pdu_singleton.access.data, upper_pdu->len); 747 748 // setup nonce - uses dst, so after pseudo address translation 749 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 750 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 751 } else { 752 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 753 } 754 755 // Dump key 756 mesh_print_hex("AppOrDevKey", appkey->key, 16); 757 758 // encrypt ccm 759 uint8_t transmic_len = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 760 uint16_t access_pdu_len = upper_pdu->len; 761 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 762 if (virtual_address){ 763 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 764 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, 765 &mesh_upper_transport_send_access_digest, upper_pdu); 766 } else { 767 mesh_upper_transport_send_access_digest(upper_pdu); 768 } 769 } 770 771 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 772 // reserve slot 773 mesh_lower_transport_reserve_slot(); 774 // reserve sequence number 775 uint32_t seq = mesh_sequence_number_next(); 776 mesh_network_pdu_set_seq(network_pdu, seq); 777 // Dump PDU 778 uint8_t opcode = network_pdu->data[9]; 779 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 780 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 781 782 // send 783 mesh_lower_transport_send_pdu((mesh_pdu_t *) network_pdu); 784 } 785 786 static void mesh_upper_transport_send_segmented_control_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 787 // reserve slot 788 mesh_lower_transport_reserve_slot(); 789 // reserve sequence number 790 uint32_t seq = mesh_sequence_number_next(); 791 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 792 upper_pdu->seq = seq; 793 // Dump PDU 794 // uint8_t opcode = upper_pdu->data[0]; 795 // printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", upper_pdu, seq, opcode); 796 // mesh_print_hex("Access Payload", &upper_pdu->data[1], upper_pdu->len - 1); 797 // send 798 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 799 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 800 801 // lend segments to lower transport pdu 802 segmented_pdu->segments = upper_pdu->segments; 803 upper_pdu->segments = NULL; 804 805 // copy meta 806 segmented_pdu->len = upper_pdu->len; 807 segmented_pdu->netkey_index = upper_pdu->netkey_index; 808 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 809 segmented_pdu->flags = upper_pdu->flags; 810 811 btstack_assert((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) == 0); 812 813 // setup segmented_pdu header 814 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 815 segmented_pdu->ivi_nid = upper_pdu->ivi_nid; 816 segmented_pdu->ctl_ttl = upper_pdu->ctl_ttl; 817 segmented_pdu->seq = upper_pdu->seq; 818 segmented_pdu->src = upper_pdu->src; 819 segmented_pdu->dst = upper_pdu->dst; 820 821 // queue up 822 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 823 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 824 825 mesh_lower_transport_send_pdu((mesh_pdu_t *) segmented_pdu); 826 } 827 828 static void mesh_upper_transport_run(void){ 829 830 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 831 832 if (crypto_active) return; 833 834 // get next message 835 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(&upper_transport_incoming); 836 mesh_network_pdu_t * network_pdu; 837 mesh_segmented_pdu_t * segmented_pdu; 838 switch (pdu->pdu_type){ 839 case MESH_PDU_TYPE_UNSEGMENTED: 840 network_pdu = (mesh_network_pdu_t *) pdu; 841 // control? 842 if (mesh_network_control(network_pdu)) { 843 844 incoming_control_pdu = &incoming_pdu_singleton.control; 845 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 846 incoming_control_pdu->len = network_pdu->len; 847 incoming_control_pdu->netkey_index = network_pdu->netkey_index; 848 849 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 850 851 incoming_control_pdu->akf_aid_control = lower_transport_pdu[0]; 852 incoming_control_pdu->len = network_pdu->len - 10; // 9 header + 1 opcode 853 (void)memcpy(incoming_control_pdu->data, &lower_transport_pdu[1], incoming_control_pdu->len); 854 855 // copy meta data into encrypted pdu buffer 856 incoming_control_pdu->ivi_nid = network_pdu->data[0]; 857 incoming_control_pdu->ctl_ttl = network_pdu->data[1]; 858 incoming_control_pdu->seq = big_endian_read_24(network_pdu->data, 2); 859 incoming_control_pdu->src = big_endian_read_16(network_pdu->data, 5); 860 incoming_control_pdu->dst = big_endian_read_16(network_pdu->data, 7); 861 862 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 863 864 // free mesh message 865 mesh_lower_transport_message_processed_by_higher_layer(pdu); 866 867 btstack_assert(mesh_control_message_handler != NULL); 868 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t*) incoming_control_pdu); 869 870 } else { 871 872 incoming_access_encrypted = (mesh_pdu_t *) network_pdu; 873 874 incoming_access_decrypted = &incoming_pdu_singleton.access; 875 incoming_access_decrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 876 incoming_access_decrypted->flags = 0; 877 incoming_access_decrypted->netkey_index = network_pdu->netkey_index; 878 incoming_access_decrypted->akf_aid_control = network_pdu->data[9]; 879 incoming_access_decrypted->len = network_pdu->len - 10; // 9 header + 1 AID 880 incoming_access_decrypted->ivi_nid = network_pdu->data[0]; 881 incoming_access_decrypted->ctl_ttl = network_pdu->data[1]; 882 incoming_access_decrypted->seq = big_endian_read_24(network_pdu->data, 2); 883 incoming_access_decrypted->src = big_endian_read_16(network_pdu->data, 5); 884 incoming_access_decrypted->dst = big_endian_read_16(network_pdu->data, 7); 885 886 mesh_upper_transport_process_access_message(); 887 } 888 break; 889 case MESH_PDU_TYPE_SEGMENTED: 890 segmented_pdu = (mesh_segmented_pdu_t *) pdu; 891 uint8_t ctl = segmented_pdu->ctl_ttl >> 7; 892 if (ctl){ 893 incoming_control_pdu= &incoming_pdu_singleton.control; 894 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 895 896 // flatten 897 mesh_segmented_pdu_flatten(&segmented_pdu->segments, 8, incoming_control_pdu->data); 898 899 // copy meta data into encrypted pdu buffer 900 incoming_control_pdu->flags = 0; 901 incoming_control_pdu->len = segmented_pdu->len; 902 incoming_control_pdu->netkey_index = segmented_pdu->netkey_index; 903 incoming_control_pdu->akf_aid_control = segmented_pdu->akf_aid_control; 904 incoming_control_pdu->ivi_nid = segmented_pdu->ivi_nid; 905 incoming_control_pdu->ctl_ttl = segmented_pdu->ctl_ttl; 906 incoming_control_pdu->seq = segmented_pdu->seq; 907 incoming_control_pdu->src = segmented_pdu->src; 908 incoming_control_pdu->dst = segmented_pdu->dst; 909 910 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 911 912 // free mesh message 913 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)segmented_pdu); 914 915 btstack_assert(mesh_control_message_handler != NULL); 916 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t*) incoming_control_pdu); 917 918 } else { 919 920 incoming_access_encrypted = (mesh_pdu_t *) segmented_pdu; 921 922 incoming_access_decrypted = &incoming_pdu_singleton.access; 923 incoming_access_decrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 924 incoming_access_decrypted->flags = segmented_pdu->flags; 925 incoming_access_decrypted->len = segmented_pdu->len; 926 incoming_access_decrypted->netkey_index = segmented_pdu->netkey_index; 927 incoming_access_decrypted->akf_aid_control = segmented_pdu->akf_aid_control; 928 incoming_access_decrypted->ivi_nid = segmented_pdu->ivi_nid; 929 incoming_access_decrypted->ctl_ttl = segmented_pdu->ctl_ttl; 930 incoming_access_decrypted->seq = segmented_pdu->seq; 931 incoming_access_decrypted->src = segmented_pdu->src; 932 incoming_access_decrypted->dst = segmented_pdu->dst; 933 934 mesh_upper_transport_process_access_message(); 935 } 936 break; 937 default: 938 btstack_assert(0); 939 break; 940 } 941 } 942 943 btstack_linked_list_iterator_t it; 944 btstack_linked_list_iterator_init(&it, &upper_transport_outgoing); 945 while (btstack_linked_list_iterator_has_next(&it)){ 946 947 if (crypto_active) break; 948 949 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_iterator_next(&it); 950 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == false) { 951 // skip pdu for now 952 continue; 953 } 954 955 mesh_upper_transport_pdu_t * upper_pdu; 956 mesh_segmented_pdu_t * segmented_pdu; 957 uint8_t transmic_len; 958 bool ok; 959 bool abort_outgoing_loop = false; 960 961 switch (pdu->pdu_type){ 962 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 963 // control pdus can go through directly 964 btstack_assert(mesh_pdu_ctl(pdu) != 0); 965 btstack_linked_list_iterator_remove(&it); 966 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 967 break; 968 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 969 // control pdus can go through directly 970 btstack_assert(mesh_pdu_ctl(pdu) != 0); 971 btstack_linked_list_iterator_remove(&it); 972 mesh_upper_transport_send_segmented_control_pdu((mesh_upper_transport_pdu_t *) pdu); 973 break; 974 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 975 // segmented access pdus required a mesh-segmented-pdu 976 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 977 if (upper_pdu->lower_pdu == NULL){ 978 upper_pdu->lower_pdu = (mesh_pdu_t *) btstack_memory_mesh_segmented_pdu_get(); 979 } 980 if (upper_pdu->lower_pdu == NULL){ 981 mesh_upper_transport_need_pdu_for_run_outgoing(); 982 abort_outgoing_loop = true; 983 break; 984 } 985 segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 986 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 987 // and a mesh-network-pdu for each segment in upper pdu 988 transmic_len = ((upper_pdu->flags & MESH_TRANSPORT_FLAG_TRANSMIC_64) != 0) ? 8 : 4; 989 ok = mesh_segmented_allocate_segments(&segmented_pdu->segments, upper_pdu->len + transmic_len); 990 if (!ok) { 991 abort_outgoing_loop = true; 992 break; 993 } 994 // all buffers available, get started 995 btstack_linked_list_iterator_remove(&it); 996 mesh_upper_transport_send_access(upper_pdu); 997 break; 998 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 999 // unsegmented access pdus require a single mesh-network-dpu 1000 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 1001 if (upper_pdu->lower_pdu == NULL){ 1002 upper_pdu->lower_pdu = (mesh_pdu_t *) mesh_network_pdu_get(); 1003 } 1004 if (upper_pdu->lower_pdu == NULL) { 1005 mesh_upper_transport_need_pdu_for_run_outgoing(); 1006 abort_outgoing_loop = true; 1007 break; 1008 } 1009 btstack_linked_list_iterator_remove(&it); 1010 mesh_upper_transport_send_access((mesh_upper_transport_pdu_t *) pdu); 1011 break; 1012 default: 1013 btstack_assert(false); 1014 break; 1015 } 1016 if (abort_outgoing_loop) { 1017 break; 1018 } 1019 } 1020 } 1021 1022 static mesh_upper_transport_pdu_t * mesh_upper_transport_find_and_remove_pdu_for_lower(mesh_pdu_t * pdu_to_find){ 1023 btstack_linked_list_iterator_t it; 1024 btstack_linked_list_iterator_init(&it, &upper_transport_outgoing_active); 1025 mesh_upper_transport_pdu_t * upper_pdu; 1026 while (btstack_linked_list_iterator_has_next(&it)){ 1027 mesh_pdu_t * mesh_pdu = (mesh_pdu_t *) btstack_linked_list_iterator_next(&it); 1028 switch (mesh_pdu->pdu_type){ 1029 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1030 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1031 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1032 upper_pdu = (mesh_upper_transport_pdu_t *) mesh_pdu; 1033 if (upper_pdu->lower_pdu == pdu_to_find){ 1034 btstack_linked_list_iterator_remove(&it); 1035 return upper_pdu; 1036 } 1037 break; 1038 default: 1039 break; 1040 } 1041 } 1042 return NULL; 1043 } 1044 1045 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 1046 mesh_upper_transport_pdu_t * upper_pdu; 1047 mesh_segmented_pdu_t * segmented_pdu; 1048 switch (callback_type){ 1049 case MESH_TRANSPORT_PDU_RECEIVED: 1050 mesh_upper_transport_message_received(pdu); 1051 break; 1052 case MESH_TRANSPORT_PDU_SENT: 1053 switch (pdu->pdu_type){ 1054 case MESH_PDU_TYPE_SEGMENTED: 1055 // try to find in outgoing active 1056 upper_pdu = mesh_upper_transport_find_and_remove_pdu_for_lower(pdu); 1057 btstack_assert(upper_pdu != NULL); 1058 segmented_pdu = (mesh_segmented_pdu_t *) pdu; 1059 // free chunks 1060 while (!btstack_linked_list_empty(&segmented_pdu->segments)){ 1061 mesh_network_pdu_t * chunk_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&segmented_pdu->segments); 1062 mesh_network_pdu_free(chunk_pdu); 1063 } 1064 // free segmented pdu 1065 btstack_memory_mesh_segmented_pdu_free(segmented_pdu); 1066 upper_pdu->lower_pdu = NULL; 1067 switch (upper_pdu->pdu_header.pdu_type){ 1068 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1069 mesh_control_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 1070 break; 1071 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1072 mesh_access_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 1073 break; 1074 default: 1075 btstack_assert(false); 1076 break; 1077 } 1078 break; 1079 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1080 // find corresponding upper transport pdu and free single segment 1081 upper_pdu = mesh_upper_transport_find_and_remove_pdu_for_lower(pdu); 1082 btstack_assert(upper_pdu != NULL); 1083 btstack_assert(upper_pdu->lower_pdu == (mesh_pdu_t *) pdu); 1084 mesh_network_pdu_free((mesh_network_pdu_t *) pdu); 1085 upper_pdu->lower_pdu = NULL; 1086 mesh_access_message_handler(callback_type, status, (mesh_pdu_t*) upper_pdu); 1087 break; 1088 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1089 mesh_access_message_handler(callback_type, status, pdu); 1090 break; 1091 default: 1092 btstack_assert(false); 1093 break; 1094 } 1095 mesh_upper_transport_run(); 1096 break; 1097 default: 1098 break; 1099 } 1100 } 1101 1102 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 1103 btstack_assert(pdu != NULL); 1104 mesh_network_pdu_t * network_pdu; 1105 mesh_segmented_pdu_t * message_pdu; 1106 mesh_upper_transport_pdu_t * upper_pdu; 1107 switch (pdu->pdu_type) { 1108 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1109 case MESH_PDU_TYPE_NETWORK: 1110 network_pdu = (mesh_network_pdu_t *) pdu; 1111 mesh_network_pdu_free(network_pdu); 1112 break; 1113 case MESH_PDU_TYPE_SEGMENTED: 1114 message_pdu = (mesh_segmented_pdu_t *) pdu; 1115 mesh_segmented_pdu_free(message_pdu); 1116 break; 1117 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1118 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1119 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1120 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 1121 while (upper_pdu->segments) { 1122 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_pop(&upper_pdu->segments); 1123 mesh_network_pdu_free(segment); 1124 } 1125 btstack_memory_mesh_upper_transport_pdu_free(upper_pdu); 1126 // check if send request can be handled now 1127 mesh_upper_transport_schedule_send_requests(); 1128 break; 1129 default: 1130 btstack_assert(false); 1131 break; 1132 } 1133 } 1134 1135 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 1136 crypto_active = 0; 1137 switch (pdu->pdu_type){ 1138 case MESH_PDU_TYPE_ACCESS: 1139 mesh_upper_transport_process_access_message_done((mesh_access_pdu_t *) pdu); 1140 case MESH_PDU_TYPE_CONTROL: 1141 mesh_upper_transport_process_control_message_done((mesh_control_pdu_t *) pdu); 1142 break; 1143 default: 1144 btstack_assert(0); 1145 break; 1146 } 1147 } 1148 1149 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 1150 switch (pdu->pdu_type){ 1151 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1152 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1153 break; 1154 default: 1155 btstack_assert(false); 1156 break; 1157 } 1158 1159 btstack_assert(((mesh_upper_transport_pdu_t *) pdu)->lower_pdu == NULL); 1160 1161 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1162 mesh_upper_transport_run(); 1163 } 1164 1165 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 1166 switch (pdu->pdu_type){ 1167 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1168 break; 1169 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1170 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 1171 break; 1172 default: 1173 btstack_assert(false); 1174 break; 1175 } 1176 1177 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1178 mesh_upper_transport_run(); 1179 } 1180 1181 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, 1182 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1183 1184 btstack_assert(network_pdu != NULL); 1185 btstack_assert(control_pdu_len <= 11); 1186 1187 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1188 if (!network_key) return 1; 1189 1190 uint8_t transport_pdu_data[12]; 1191 transport_pdu_data[0] = opcode; 1192 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 1193 uint16_t transport_pdu_len = control_pdu_len + 1; 1194 1195 // setup network_pdu 1196 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL; 1197 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 1198 1199 return 0; 1200 } 1201 1202 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){ 1203 1204 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1205 if (!network_key) return 1; 1206 1207 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1208 upper_pdu->ctl_ttl = ttl; 1209 upper_pdu->src = src; 1210 upper_pdu->dst = dest; 1211 upper_pdu->netkey_index = netkey_index; 1212 upper_pdu->akf_aid_control = opcode; 1213 return 0; 1214 } 1215 1216 static uint8_t mesh_upper_transport_setup_upper_access_pdu_header(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, 1217 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1218 1219 // get app or device key 1220 const mesh_transport_key_t *appkey; 1221 appkey = mesh_transport_key_get(appkey_index); 1222 if (appkey == NULL) { 1223 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 1224 return 1; 1225 } 1226 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1227 1228 // lookup network by netkey_index 1229 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 1230 if (!network_key) return 1; 1231 if (network_key == NULL) { 1232 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 1233 return 1; 1234 } 1235 1236 // store in transport pdu 1237 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1238 upper_pdu->ctl_ttl = ttl; 1239 upper_pdu->src = src; 1240 upper_pdu->dst = dest; 1241 upper_pdu->netkey_index = netkey_index; 1242 upper_pdu->appkey_index = appkey_index; 1243 upper_pdu->akf_aid_control = akf_aid; 1244 if (szmic) { 1245 upper_pdu->flags |= MESH_TRANSPORT_FLAG_TRANSMIC_64; 1246 } 1247 return 0; 1248 } 1249 1250 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 1251 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1252 switch (pdu->pdu_type){ 1253 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1254 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1255 return mesh_upper_transport_setup_upper_access_pdu_header((mesh_upper_transport_pdu_t *) pdu, netkey_index, 1256 appkey_index, ttl, src, dest, szmic); 1257 default: 1258 btstack_assert(false); 1259 return 1; 1260 } 1261 } 1262 1263 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)) { 1264 mesh_access_message_handler = callback; 1265 } 1266 1267 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)){ 1268 mesh_control_message_handler = callback; 1269 } 1270 1271 void mesh_upper_transport_init(){ 1272 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1273 } 1274 1275 bool mesh_upper_transport_message_reserve(void){ 1276 if (message_builder_reserved_upper_pdu == NULL){ 1277 message_builder_reserved_upper_pdu = btstack_memory_mesh_upper_transport_pdu_get(); 1278 } 1279 if (message_builder_reserved_upper_pdu == NULL){ 1280 return false; 1281 } 1282 while (message_builder_num_network_pdus_reserved < MESSAGE_BUILDER_MAX_NUM_NETWORK_PDUS){ 1283 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 1284 if (network_pdu == NULL){ 1285 return false; 1286 } 1287 btstack_linked_list_add(&message_builder_reserved_network_pdus, (btstack_linked_item_t *) network_pdu); 1288 message_builder_num_network_pdus_reserved++; 1289 } 1290 return true; 1291 } 1292 1293 void mesh_upper_transport_message_init(mesh_upper_transport_builder_t * builder, mesh_pdu_type_t pdu_type) { 1294 btstack_assert(builder != NULL); 1295 1296 // use reserved buffer if available 1297 if (message_builder_reserved_upper_pdu != NULL){ 1298 builder->pdu = message_builder_reserved_upper_pdu; 1299 message_builder_reserved_upper_pdu = NULL; 1300 } else { 1301 builder->pdu = btstack_memory_mesh_upper_transport_pdu_get(); 1302 } 1303 if (!builder->pdu) return; 1304 1305 builder->segment = NULL; 1306 builder->pdu->pdu_header.pdu_type = pdu_type; 1307 builder->pdu->ack_opcode = MESH_ACCESS_OPCODE_NOT_SET; 1308 } 1309 1310 1311 void mesh_upper_transport_message_add_data(mesh_upper_transport_builder_t * builder, const uint8_t * data, uint16_t data_len){ 1312 btstack_assert(builder != NULL); 1313 1314 if (builder->pdu == NULL) return; 1315 1316 builder->pdu->len += data_len; 1317 1318 uint16_t bytes_current_segment = 0; 1319 if (builder->segment){ 1320 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX - builder->segment->len; 1321 } 1322 while (data_len > 0){ 1323 if (bytes_current_segment == 0){ 1324 // use reserved buffer if available 1325 if (message_builder_num_network_pdus_reserved > 0){ 1326 message_builder_num_network_pdus_reserved--; 1327 builder->segment = (mesh_network_pdu_t *) btstack_linked_list_pop(&message_builder_reserved_network_pdus); 1328 } else { 1329 builder->segment = (mesh_network_pdu_t *) mesh_network_pdu_get(); 1330 } 1331 if (builder->segment == NULL) { 1332 mesh_upper_transport_pdu_free((mesh_pdu_t *) builder->pdu); 1333 builder->pdu = NULL; 1334 return; 1335 } 1336 btstack_linked_list_add_tail(&builder->pdu->segments, (btstack_linked_item_t *) builder->segment); 1337 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX; 1338 } 1339 uint16_t bytes_to_copy = btstack_min(bytes_current_segment, data_len); 1340 (void) memcpy(&builder->segment->data[builder->segment->len], data, bytes_to_copy); 1341 builder->segment->len += bytes_to_copy; 1342 bytes_current_segment -= bytes_to_copy; 1343 data += bytes_to_copy; 1344 data_len -= bytes_to_copy; 1345 } 1346 } 1347 1348 void mesh_upper_transport_message_add_uint8(mesh_upper_transport_builder_t * builder, uint8_t value){ 1349 mesh_upper_transport_message_add_data(builder, &value, 1); 1350 } 1351 1352 void mesh_upper_transport_message_add_uint16(mesh_upper_transport_builder_t * builder, uint16_t value){ 1353 uint8_t buffer[2]; 1354 little_endian_store_16(buffer, 0, value); 1355 mesh_upper_transport_message_add_data(builder, buffer, sizeof(buffer)); 1356 } 1357 1358 void mesh_upper_transport_message_add_uint24(mesh_upper_transport_builder_t * builder, uint32_t value){ 1359 uint8_t buffer[3]; 1360 little_endian_store_24(buffer, 0, value); 1361 mesh_upper_transport_message_add_data(builder, buffer, sizeof(buffer)); 1362 } 1363 1364 void mesh_upper_transport_message_add_uint32(mesh_upper_transport_builder_t * builder, uint32_t value){ 1365 uint8_t buffer[4]; 1366 little_endian_store_32(buffer, 0, value); 1367 mesh_upper_transport_message_add_data(builder, buffer, sizeof(buffer)); 1368 } 1369 1370 mesh_upper_transport_pdu_t * mesh_upper_transport_message_finalize(mesh_upper_transport_builder_t * builder){ 1371 return builder->pdu; 1372 } 1373