1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "mesh_upper_transport.c" 39 40 #include "mesh/mesh_upper_transport.h" 41 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #include "btstack_util.h" 47 #include "btstack_memory.h" 48 #include "btstack_debug.h" 49 #include "btstack_bool.h" 50 51 #include "mesh/beacon.h" 52 #include "mesh/mesh_iv_index_seq_number.h" 53 #include "mesh/mesh_keys.h" 54 #include "mesh/mesh_lower_transport.h" 55 #include "mesh/mesh_peer.h" 56 #include "mesh/mesh_virtual_addresses.h" 57 58 // TODO: extract mesh_pdu functions into lower transport or network 59 #include "mesh/mesh_access.h" 60 61 // combined key x address iterator for upper transport decryption 62 63 typedef struct { 64 // state 65 mesh_transport_key_iterator_t key_it; 66 mesh_virtual_address_iterator_t address_it; 67 // elements 68 const mesh_transport_key_t * key; 69 const mesh_virtual_address_t * address; 70 // address - might be virtual 71 uint16_t dst; 72 // key info 73 } mesh_transport_key_and_virtual_address_iterator_t; 74 75 static void mesh_upper_transport_validate_access_message(void); 76 static void mesh_upper_transport_run(void); 77 78 // upper transport callbacks - in access layer 79 static void (*mesh_access_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 80 static void (*mesh_control_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 81 82 // 83 static int crypto_active; 84 static uint8_t application_nonce[13]; 85 static btstack_crypto_ccm_t ccm; 86 static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; 87 88 // incoming segmented (mesh_segmented_pdu_t) or unsegmented (network_pdu_t) 89 static mesh_pdu_t * incoming_access_encrypted; 90 91 // multi-purpose union: segmented control reassembly, decrypted access pdu 92 static union { 93 mesh_control_pdu_t control; 94 mesh_access_pdu_t access; 95 } incoming_pdu_singleton; 96 97 // pointer to incoming_pdu_singleton.access 98 static mesh_access_pdu_t * incoming_access_decrypted; 99 100 // pointer to incoming_pdu_singleton.access 101 static mesh_control_pdu_t * incoming_control_pdu; 102 103 // incoming unsegmented (network) and segmented (transport) control and access messages 104 static btstack_linked_list_t upper_transport_incoming; 105 106 // outgoing unsegmented and segmented control and access messages 107 static btstack_linked_list_t upper_transport_outgoing; 108 109 // outgoing upper transport messages that have been sent to lower transport and wait for sent event 110 static btstack_linked_list_t upper_transport_outgoing_active; 111 112 // TODO: higher layer define used for assert 113 #define MESH_ACCESS_OPCODE_NOT_SET 0xFFFFFFFEu 114 115 static void mesh_print_hex(const char * name, const uint8_t * data, uint16_t len){ 116 printf("%-20s ", name); 117 printf_hexdump(data, len); 118 } 119 // static void mesh_print_x(const char * name, uint32_t value){ 120 // printf("%20s: 0x%x", name, (int) value); 121 // } 122 123 static void mesh_transport_key_and_virtual_address_iterator_init(mesh_transport_key_and_virtual_address_iterator_t *it, 124 uint16_t dst, uint16_t netkey_index, uint8_t akf, 125 uint8_t aid) { 126 printf("KEY_INIT: dst %04x, akf %x, aid %x\n", dst, akf, aid); 127 // config 128 it->dst = dst; 129 // init elements 130 it->key = NULL; 131 it->address = NULL; 132 // init element iterators 133 mesh_transport_key_aid_iterator_init(&it->key_it, netkey_index, akf, aid); 134 // init address iterator 135 if (mesh_network_address_virtual(it->dst)){ 136 mesh_virtual_address_iterator_init(&it->address_it, dst); 137 // get first key 138 if (mesh_transport_key_aid_iterator_has_more(&it->key_it)) { 139 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 140 } 141 } 142 } 143 144 // cartesian product: keys x addressses 145 static int mesh_transport_key_and_virtual_address_iterator_has_more(mesh_transport_key_and_virtual_address_iterator_t * it){ 146 if (mesh_network_address_virtual(it->dst)) { 147 // find next valid entry 148 while (true){ 149 if (mesh_virtual_address_iterator_has_more(&it->address_it)) return 1; 150 if (!mesh_transport_key_aid_iterator_has_more(&it->key_it)) return 0; 151 // get next key 152 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 153 mesh_virtual_address_iterator_init(&it->address_it, it->dst); 154 } 155 } else { 156 return mesh_transport_key_aid_iterator_has_more(&it->key_it); 157 } 158 } 159 160 static void mesh_transport_key_and_virtual_address_iterator_next(mesh_transport_key_and_virtual_address_iterator_t * it){ 161 if (mesh_network_address_virtual(it->dst)) { 162 it->address = mesh_virtual_address_iterator_get_next(&it->address_it); 163 } else { 164 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 165 } 166 } 167 168 // UPPER TRANSPORT 169 170 static void mesh_segmented_pdu_flatten(btstack_linked_list_t * segments, uint8_t segment_len, uint8_t * buffer) { 171 // assemble payload 172 btstack_linked_list_iterator_t it; 173 btstack_linked_list_iterator_init(&it, segments); 174 while (btstack_linked_list_iterator_has_next(&it)) { 175 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 176 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 177 // get segment n 178 uint8_t *lower_transport_pdu = mesh_network_pdu_data(segment); 179 uint8_t seg_o = (big_endian_read_16(lower_transport_pdu, 2) >> 5) & 0x001f; 180 uint8_t *segment_data = &lower_transport_pdu[4]; 181 (void) memcpy(&buffer[seg_o * segment_len], segment_data, segment_len); 182 } 183 } 184 185 static uint16_t mesh_upper_pdu_flatten(mesh_upper_transport_pdu_t * upper_pdu, uint8_t * buffer, uint16_t buffer_len) { 186 // assemble payload 187 btstack_linked_list_iterator_t it; 188 btstack_linked_list_iterator_init(&it, &upper_pdu->segments); 189 uint16_t offset = 0; 190 while (btstack_linked_list_iterator_has_next(&it)) { 191 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 192 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 193 btstack_assert((offset + segment->len) <= buffer_len); 194 (void) memcpy(&buffer[offset], segment->data, segment->len); 195 offset += segment->len; 196 } 197 return offset; 198 } 199 200 // store payload in provided list of network pdus 201 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){ 202 uint16_t payload_offset = 0; 203 uint16_t bytes_current_segment = 0; 204 mesh_network_pdu_t * network_pdu = NULL; 205 while (payload_offset < payload_len){ 206 if (bytes_current_segment == 0){ 207 network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(in_segments); 208 btstack_assert(network_pdu != NULL); 209 btstack_linked_list_add_tail(out_segments, (btstack_linked_item_t *) network_pdu); 210 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX; 211 } 212 uint16_t bytes_to_copy = btstack_min(bytes_current_segment, payload_len - payload_offset); 213 (void) memcpy(&network_pdu->data[network_pdu->len], &payload[payload_offset], bytes_to_copy); 214 bytes_current_segment -= bytes_to_copy; 215 network_pdu->len += bytes_to_copy; 216 payload_offset += bytes_to_copy; 217 } 218 } 219 220 // tries allocate and add enough segments to store payload of given size 221 static bool mesh_segmented_allocate_segments(btstack_linked_list_t * segments, uint16_t payload_len){ 222 uint16_t storage_size = btstack_linked_list_count(segments) * MESH_NETWORK_PAYLOAD_MAX; 223 while (storage_size < payload_len){ 224 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 225 if (network_pdu == NULL) break; 226 storage_size += MESH_NETWORK_PAYLOAD_MAX; 227 btstack_linked_list_add(segments, (btstack_linked_item_t *) network_pdu); 228 } 229 return (storage_size >= payload_len); 230 } 231 232 // stub lower transport 233 234 static void mesh_upper_transport_dump_pdus(const char *name, btstack_linked_list_t *list){ 235 printf("List: %s:\n", name); 236 btstack_linked_list_iterator_t it; 237 btstack_linked_list_iterator_init(&it, list); 238 while (btstack_linked_list_iterator_has_next(&it)){ 239 mesh_pdu_t * pdu = (mesh_pdu_t*) btstack_linked_list_iterator_next(&it); 240 printf("- %p\n", pdu); 241 // printf_hexdump( mesh_pdu_data(pdu), mesh_pdu_len(pdu)); 242 } 243 } 244 245 static void mesh_upper_transport_reset_pdus(btstack_linked_list_t *list){ 246 while (!btstack_linked_list_empty(list)){ 247 mesh_upper_transport_pdu_free((mesh_pdu_t *) btstack_linked_list_pop(list)); 248 } 249 } 250 251 void mesh_upper_transport_dump(void){ 252 mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); 253 } 254 255 void mesh_upper_transport_reset(void){ 256 crypto_active = 0; 257 mesh_upper_transport_reset_pdus(&upper_transport_incoming); 258 } 259 260 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 261 // Device Key is fixed 262 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 263 return mesh_transport_key_get(appkey_index); 264 } 265 266 // Get key refresh state from subnet 267 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 268 if (subnet == NULL) return NULL; 269 270 // identify old and new app keys for given appkey_index 271 mesh_transport_key_t * old_key = NULL; 272 mesh_transport_key_t * new_key = NULL; 273 mesh_transport_key_iterator_t it; 274 mesh_transport_key_iterator_init(&it, netkey_index); 275 while (mesh_transport_key_iterator_has_more(&it)){ 276 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 277 if (transport_key->appkey_index != appkey_index) continue; 278 if (transport_key->old_key == 0) { 279 new_key = transport_key; 280 } else { 281 old_key = transport_key; 282 } 283 } 284 285 // if no key is marked as old, just use the current one 286 if (old_key == NULL) return new_key; 287 288 // use new key if it exists in phase two 289 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 290 return new_key; 291 } else { 292 return old_key; 293 } 294 } 295 296 static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ 297 // get IV Index and IVI 298 uint32_t iv_index = mesh_get_iv_index(); 299 int ivi = ivi_nid >> 7; 300 301 // if least significant bit differs, use previous IV Index 302 if ((iv_index & 1 ) ^ ivi){ 303 iv_index--; 304 } 305 return iv_index; 306 } 307 308 static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 309 mesh_access_pdu_t * access_pdu; 310 mesh_upper_transport_pdu_t * upper_pdu; 311 switch (pdu->pdu_type){ 312 case MESH_PDU_TYPE_ACCESS: 313 access_pdu = (mesh_access_pdu_t *) pdu; 314 nonce[1] = access_pdu->transmic_len == 8 ? 0x80 : 0x00; 315 big_endian_store_24(nonce, 2, access_pdu->seq); 316 big_endian_store_16(nonce, 5, access_pdu->src); 317 big_endian_store_16(nonce, 7, access_pdu->dst); 318 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(access_pdu->ivi_nid)); 319 break; 320 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 321 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 322 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 323 nonce[1] = upper_pdu->transmic_len == 8 ? 0x80 : 0x00; 324 // 'network header' 325 big_endian_store_24(nonce, 2, upper_pdu->seq); 326 big_endian_store_16(nonce, 5, upper_pdu->src); 327 big_endian_store_16(nonce, 7, upper_pdu->dst); 328 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(upper_pdu->ivi_nid)); 329 break; 330 default: 331 btstack_assert(0); 332 break; 333 } 334 } 335 336 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 337 nonce[0] = 0x01; 338 transport_segmented_setup_nonce(nonce, pdu); 339 mesh_print_hex("AppNonce", nonce, 13); 340 } 341 342 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 343 nonce[0] = 0x02; 344 transport_segmented_setup_nonce(nonce, pdu); 345 mesh_print_hex("DeviceNonce", nonce, 13); 346 } 347 348 static void mesh_upper_transport_process_access_message_done(mesh_access_pdu_t *access_pdu){ 349 crypto_active = 0; 350 btstack_assert((access_pdu->ctl_ttl & 0x80) == 0); 351 mesh_lower_transport_message_processed_by_higher_layer(incoming_access_encrypted); 352 incoming_access_encrypted = NULL; 353 incoming_access_decrypted = NULL; 354 mesh_upper_transport_run(); 355 } 356 357 static void mesh_upper_transport_process_control_message_done(mesh_control_pdu_t * control_pdu){ 358 crypto_active = 0; 359 incoming_control_pdu = NULL; 360 mesh_upper_transport_run(); 361 } 362 363 static void mesh_upper_transport_validate_access_message_ccm(void * arg){ 364 UNUSED(arg); 365 366 uint8_t * upper_transport_pdu = incoming_access_decrypted->data; 367 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - incoming_access_decrypted->transmic_len; 368 369 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 370 371 // store TransMIC 372 uint8_t trans_mic[8]; 373 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 374 mesh_print_hex("TransMIC", trans_mic, incoming_access_decrypted->transmic_len); 375 376 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], incoming_access_decrypted->transmic_len) == 0){ 377 printf("TransMIC matches\n"); 378 379 // remove TransMIC from payload 380 incoming_access_decrypted->len -= incoming_access_decrypted->transmic_len; 381 382 // if virtual address, update dst to pseudo_dst 383 if (mesh_network_address_virtual(incoming_access_decrypted->dst)){ 384 incoming_access_decrypted->dst = mesh_transport_key_it.address->pseudo_dst; 385 } 386 387 // pass to upper layer 388 btstack_assert(mesh_access_message_handler != NULL); 389 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_access_decrypted; 390 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 391 392 printf("\n"); 393 394 } else { 395 uint8_t akf = incoming_access_decrypted->akf_aid_control & 0x40; 396 if (akf){ 397 printf("TransMIC does not match, try next key\n"); 398 mesh_upper_transport_validate_access_message(); 399 } else { 400 printf("TransMIC does not match device key, done\n"); 401 // done 402 mesh_upper_transport_process_access_message_done(incoming_access_decrypted); 403 } 404 } 405 } 406 407 static void mesh_upper_transport_validate_access_message_digest(void * arg){ 408 UNUSED(arg); 409 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - incoming_access_decrypted->transmic_len; 410 uint8_t * upper_transport_pdu_data_in = incoming_access_decrypted->data; 411 uint8_t * upper_transport_pdu_data_out = incoming_access_decrypted->data; 412 413 mesh_network_pdu_t * unsegmented_pdu = NULL; 414 mesh_segmented_pdu_t * segmented_pdu = NULL; 415 switch (incoming_access_encrypted->pdu_type){ 416 case MESH_PDU_TYPE_SEGMENTED: 417 segmented_pdu = (mesh_segmented_pdu_t *) incoming_access_encrypted; 418 mesh_segmented_pdu_flatten(&segmented_pdu->segments, 12, upper_transport_pdu_data_out); 419 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_out, upper_transport_pdu_data_out, 420 &mesh_upper_transport_validate_access_message_ccm, NULL); 421 break; 422 case MESH_PDU_TYPE_UNSEGMENTED: 423 unsegmented_pdu = (mesh_network_pdu_t *) incoming_access_encrypted; 424 (void)memcpy(upper_transport_pdu_data_out, &unsegmented_pdu->data[10], incoming_access_decrypted->len); 425 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_out, upper_transport_pdu_data_out, 426 &mesh_upper_transport_validate_access_message_ccm, NULL); 427 break; 428 default: 429 btstack_assert(false); 430 break; 431 } 432 433 } 434 435 static void mesh_upper_transport_validate_access_message(void){ 436 uint8_t * upper_transport_pdu_data = incoming_access_decrypted->data; 437 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - incoming_access_decrypted->transmic_len; 438 439 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 440 printf("No valid transport key found\n"); 441 mesh_upper_transport_process_access_message_done(incoming_access_decrypted); 442 return; 443 } 444 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 445 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 446 447 if (message_key->akf){ 448 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) incoming_access_decrypted); 449 } else { 450 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) incoming_access_decrypted); 451 } 452 453 // store application / device key index 454 mesh_print_hex("AppOrDevKey", message_key->key, 16); 455 incoming_access_decrypted->appkey_index = message_key->appkey_index; 456 457 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 458 459 // decrypt ccm 460 crypto_active = 1; 461 uint16_t aad_len = 0; 462 if (mesh_network_address_virtual(incoming_access_decrypted->dst)){ 463 aad_len = 16; 464 } 465 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, incoming_access_decrypted->transmic_len); 466 467 if (aad_len){ 468 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, 469 &mesh_upper_transport_validate_access_message_digest, NULL); 470 } else { 471 mesh_upper_transport_validate_access_message_digest(NULL); 472 } 473 } 474 475 static void mesh_upper_transport_process_access_message(void){ 476 uint8_t * upper_transport_pdu = incoming_access_decrypted->data; 477 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - incoming_access_decrypted->transmic_len; 478 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 479 480 uint8_t aid = incoming_access_decrypted->akf_aid_control & 0x3f; 481 uint8_t akf = (incoming_access_decrypted->akf_aid_control & 0x40) >> 6; 482 483 printf("AKF: %u\n", akf); 484 printf("AID: %02x\n", aid); 485 486 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, incoming_access_decrypted->dst, 487 incoming_access_decrypted->netkey_index, akf, aid); 488 mesh_upper_transport_validate_access_message(); 489 } 490 491 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 492 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 493 mesh_upper_transport_run(); 494 } 495 496 static void mesh_upper_transport_send_access_segmented(mesh_upper_transport_pdu_t * upper_pdu){ 497 498 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 499 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 500 501 // convert mesh_access_pdu_t into mesh_segmented_pdu_t 502 btstack_linked_list_t free_segments = segmented_pdu->segments; 503 segmented_pdu->segments = NULL; 504 mesh_segmented_store_payload(incoming_pdu_singleton.access.data, upper_pdu->len, &free_segments, &segmented_pdu->segments); 505 506 // copy meta 507 segmented_pdu->len = upper_pdu->len; 508 segmented_pdu->netkey_index = upper_pdu->netkey_index; 509 segmented_pdu->transmic_len = upper_pdu->transmic_len; 510 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 511 segmented_pdu->flags = upper_pdu->flags; 512 513 // setup segmented_pdu header 514 // (void)memcpy(segmented_pdu->network_header, upper_pdu->network_header, 9); 515 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 516 segmented_pdu->ivi_nid = upper_pdu->ivi_nid; 517 segmented_pdu->ctl_ttl = upper_pdu->ctl_ttl; 518 segmented_pdu->seq = upper_pdu->seq; 519 segmented_pdu->src = upper_pdu->src; 520 segmented_pdu->dst = upper_pdu->dst; 521 522 // queue up 523 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 524 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 525 526 mesh_lower_transport_send_pdu((mesh_pdu_t*) segmented_pdu); 527 } 528 529 static void mesh_upper_transport_send_access_unsegmented(mesh_upper_transport_pdu_t * upper_pdu){ 530 531 // provide segment 532 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) upper_pdu->lower_pdu; 533 534 // setup network pdu 535 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS; 536 network_pdu->data[0] = upper_pdu->ivi_nid; 537 network_pdu->data[1] = upper_pdu->ctl_ttl; 538 big_endian_store_24(network_pdu->data, 2, upper_pdu->seq); 539 big_endian_store_16(network_pdu->data, 5, upper_pdu->src); 540 big_endian_store_16(network_pdu->data, 7, upper_pdu->dst); 541 network_pdu->netkey_index = upper_pdu->netkey_index; 542 543 // setup access message 544 network_pdu->data[9] = upper_pdu->akf_aid_control; 545 btstack_assert(upper_pdu->len < 15); 546 (void)memcpy(&network_pdu->data[10], &incoming_pdu_singleton.access.data, upper_pdu->len); 547 network_pdu->len = 10 + upper_pdu->len; 548 network_pdu->flags = 0; 549 550 // queue up 551 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 552 553 mesh_lower_transport_send_pdu((mesh_pdu_t*) network_pdu); 554 } 555 556 static void mesh_upper_transport_send_access_ccm(void * arg){ 557 crypto_active = 0; 558 559 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 560 mesh_print_hex("EncAccessPayload", incoming_pdu_singleton.access.data, upper_pdu->len); 561 // store TransMIC 562 btstack_crypto_ccm_get_authentication_value(&ccm, &incoming_pdu_singleton.access.data[upper_pdu->len]); 563 mesh_print_hex("TransMIC", &incoming_pdu_singleton.access.data[upper_pdu->len], upper_pdu->transmic_len); 564 upper_pdu->len += upper_pdu->transmic_len; 565 mesh_print_hex("UpperTransportPDU", incoming_pdu_singleton.access.data, upper_pdu->len); 566 switch (upper_pdu->pdu_header.pdu_type){ 567 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 568 mesh_upper_transport_send_access_unsegmented(upper_pdu); 569 break; 570 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 571 mesh_upper_transport_send_access_segmented(upper_pdu); 572 break; 573 default: 574 btstack_assert(false); 575 } 576 } 577 578 static void mesh_upper_transport_send_access_digest(void *arg){ 579 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 580 uint16_t access_pdu_len = upper_pdu->len; 581 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, incoming_pdu_singleton.access.data, incoming_pdu_singleton.access.data, 582 &mesh_upper_transport_send_access_ccm, upper_pdu); 583 } 584 585 static void mesh_upper_transport_send_access(mesh_upper_transport_pdu_t * upper_pdu){ 586 587 // if dst is virtual address, lookup label uuid and hash 588 uint16_t aad_len = 0; 589 mesh_virtual_address_t * virtual_address = NULL; 590 if (mesh_network_address_virtual(upper_pdu->dst)){ 591 virtual_address = mesh_virtual_address_for_pseudo_dst(upper_pdu->dst); 592 if (!virtual_address){ 593 printf("No virtual address register for pseudo dst %4x\n", upper_pdu->dst); 594 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 595 return; 596 } 597 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 598 // printf_hexdump(virtual_address->label_uuid, 16); 599 aad_len = 16; 600 upper_pdu->dst = virtual_address->hash; 601 } 602 603 // get app or device key 604 uint16_t appkey_index = upper_pdu->appkey_index; 605 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(upper_pdu->netkey_index, appkey_index); 606 if (appkey == NULL){ 607 printf("AppKey %04x not found, drop message\n", appkey_index); 608 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 609 return; 610 } 611 612 // reserve slot 613 mesh_lower_transport_reserve_slot(); 614 615 // reserve one sequence number, which is also used to encrypt access payload 616 uint32_t seq = mesh_sequence_number_next(); 617 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 618 upper_pdu->seq = seq; 619 620 // also reserves crypto_buffer 621 crypto_active = 1; 622 623 // flatten segmented pdu into crypto buffer 624 uint16_t payload_len = mesh_upper_pdu_flatten(upper_pdu, incoming_pdu_singleton.access.data, sizeof(incoming_pdu_singleton.access.data)); 625 btstack_assert(payload_len == upper_pdu->len); 626 627 // Dump PDU 628 printf("[+] Upper transport, send upper (un)segmented Access PDU - dest %04x, seq %06x\n", upper_pdu->dst, upper_pdu->seq); 629 mesh_print_hex("Access Payload", incoming_pdu_singleton.access.data, upper_pdu->len); 630 631 // setup nonce - uses dst, so after pseudo address translation 632 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 633 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 634 } else { 635 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 636 } 637 638 // Dump key 639 mesh_print_hex("AppOrDevKey", appkey->key, 16); 640 641 // encrypt ccm 642 uint8_t transmic_len = upper_pdu->transmic_len; 643 uint16_t access_pdu_len = upper_pdu->len; 644 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 645 if (virtual_address){ 646 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 647 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, 648 &mesh_upper_transport_send_access_digest, upper_pdu); 649 } else { 650 mesh_upper_transport_send_access_digest(upper_pdu); 651 } 652 } 653 654 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 655 // reserve slot 656 mesh_lower_transport_reserve_slot(); 657 // reserve sequence number 658 uint32_t seq = mesh_sequence_number_next(); 659 mesh_network_pdu_set_seq(network_pdu, seq); 660 // Dump PDU 661 uint8_t opcode = network_pdu->data[9]; 662 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 663 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 664 665 // send 666 mesh_lower_transport_send_pdu((mesh_pdu_t *) network_pdu); 667 } 668 669 static void mesh_upper_transport_send_segmented_control_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 670 // reserve slot 671 mesh_lower_transport_reserve_slot(); 672 // reserve sequence number 673 uint32_t seq = mesh_sequence_number_next(); 674 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 675 upper_pdu->seq = seq; 676 // Dump PDU 677 // uint8_t opcode = upper_pdu->data[0]; 678 // printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", upper_pdu, seq, opcode); 679 // mesh_print_hex("Access Payload", &upper_pdu->data[1], upper_pdu->len - 1); 680 // send 681 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 682 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 683 684 // lend segments to lower transport pdu 685 segmented_pdu->segments = upper_pdu->segments; 686 upper_pdu->segments = NULL; 687 688 // copy meta 689 segmented_pdu->len = upper_pdu->len; 690 segmented_pdu->netkey_index = upper_pdu->netkey_index; 691 segmented_pdu->transmic_len = 0; // no TransMIC for control 692 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 693 segmented_pdu->flags = upper_pdu->flags; 694 695 // setup segmented_pdu header 696 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 697 segmented_pdu->ivi_nid = upper_pdu->ivi_nid; 698 segmented_pdu->ctl_ttl = upper_pdu->ctl_ttl; 699 segmented_pdu->seq = upper_pdu->seq; 700 segmented_pdu->src = upper_pdu->src; 701 segmented_pdu->dst = upper_pdu->dst; 702 703 // queue up 704 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 705 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 706 707 mesh_lower_transport_send_pdu((mesh_pdu_t *) segmented_pdu); 708 } 709 710 static void mesh_upper_transport_run(void){ 711 712 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 713 714 if (crypto_active) return; 715 716 // get next message 717 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(&upper_transport_incoming); 718 mesh_network_pdu_t * network_pdu; 719 mesh_segmented_pdu_t * message_pdu; 720 switch (pdu->pdu_type){ 721 case MESH_PDU_TYPE_UNSEGMENTED: 722 network_pdu = (mesh_network_pdu_t *) pdu; 723 // control? 724 if (mesh_network_control(network_pdu)) { 725 726 incoming_control_pdu = &incoming_pdu_singleton.control; 727 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 728 incoming_control_pdu->len = network_pdu->len; 729 incoming_control_pdu->netkey_index = network_pdu->netkey_index; 730 731 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 732 733 incoming_control_pdu->akf_aid_control = lower_transport_pdu[0]; 734 incoming_control_pdu->len = network_pdu->len - 10; // 9 header + 1 opcode 735 (void)memcpy(incoming_control_pdu->data, &lower_transport_pdu[1], incoming_control_pdu->len); 736 737 // copy meta data into encrypted pdu buffer 738 incoming_control_pdu->ivi_nid = network_pdu->data[0]; 739 incoming_control_pdu->ctl_ttl = network_pdu->data[1]; 740 incoming_control_pdu->seq = big_endian_read_24(network_pdu->data, 2); 741 incoming_control_pdu->src = big_endian_read_16(network_pdu->data, 5); 742 incoming_control_pdu->dst = big_endian_read_16(network_pdu->data, 7); 743 744 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 745 746 // free mesh message 747 mesh_lower_transport_message_processed_by_higher_layer(pdu); 748 749 btstack_assert(mesh_control_message_handler != NULL); 750 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 751 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 752 753 } else { 754 755 incoming_access_encrypted = (mesh_pdu_t *) network_pdu; 756 757 incoming_access_decrypted = &incoming_pdu_singleton.access; 758 incoming_access_decrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 759 incoming_access_decrypted->netkey_index = network_pdu->netkey_index; 760 incoming_access_decrypted->transmic_len = 4; 761 incoming_access_decrypted->akf_aid_control = network_pdu->data[9]; 762 incoming_access_decrypted->len = network_pdu->len - 10; // 9 header + 1 AID 763 incoming_access_decrypted->ivi_nid = network_pdu->data[0]; 764 incoming_access_decrypted->ctl_ttl = network_pdu->data[1]; 765 incoming_access_decrypted->seq = big_endian_read_24(network_pdu->data, 2); 766 incoming_access_decrypted->src = big_endian_read_16(network_pdu->data, 5); 767 incoming_access_decrypted->dst = big_endian_read_16(network_pdu->data, 7); 768 // (void)memcpy(incoming_access_decrypted->network_header, network_pdu->data, 9); 769 770 mesh_upper_transport_process_access_message(); 771 } 772 break; 773 case MESH_PDU_TYPE_SEGMENTED: 774 message_pdu = (mesh_segmented_pdu_t *) pdu; 775 uint8_t ctl = message_pdu->ctl_ttl >> 7; 776 if (ctl){ 777 incoming_control_pdu= &incoming_pdu_singleton.control; 778 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 779 780 // flatten 781 mesh_segmented_pdu_flatten(&message_pdu->segments, 8, incoming_control_pdu->data); 782 783 // copy meta data into encrypted pdu buffer 784 incoming_control_pdu->flags = 0; 785 incoming_control_pdu->len = message_pdu->len; 786 incoming_control_pdu->netkey_index = message_pdu->netkey_index; 787 incoming_control_pdu->akf_aid_control = message_pdu->akf_aid_control; 788 incoming_access_decrypted->ivi_nid = message_pdu->ivi_nid; 789 incoming_access_decrypted->ctl_ttl = message_pdu->ctl_ttl; 790 incoming_access_decrypted->seq = message_pdu->seq; 791 incoming_access_decrypted->src = message_pdu->src; 792 incoming_access_decrypted->dst = message_pdu->dst; 793 794 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 795 796 // free mesh message 797 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 798 799 btstack_assert(mesh_control_message_handler != NULL); 800 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 801 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 802 803 } else { 804 805 incoming_access_encrypted = (mesh_pdu_t *) message_pdu; 806 807 incoming_access_decrypted = &incoming_pdu_singleton.access; 808 incoming_access_decrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 809 incoming_access_decrypted->len = message_pdu->len; 810 incoming_access_decrypted->netkey_index = message_pdu->netkey_index; 811 incoming_access_decrypted->transmic_len = message_pdu->transmic_len; 812 incoming_access_decrypted->akf_aid_control = message_pdu->akf_aid_control; 813 incoming_access_decrypted->ivi_nid = message_pdu->ivi_nid; 814 incoming_access_decrypted->ctl_ttl = message_pdu->ctl_ttl; 815 incoming_access_decrypted->seq = message_pdu->seq; 816 incoming_access_decrypted->src = message_pdu->src; 817 incoming_access_decrypted->dst = message_pdu->dst; 818 819 mesh_upper_transport_process_access_message(); 820 } 821 break; 822 default: 823 btstack_assert(0); 824 break; 825 } 826 } 827 828 while (!btstack_linked_list_empty(&upper_transport_outgoing)){ 829 830 if (crypto_active) break; 831 832 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_outgoing); 833 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == 0) break; 834 835 mesh_upper_transport_pdu_t * upper_pdu; 836 mesh_segmented_pdu_t * segmented_pdu; 837 bool ok; 838 839 switch (pdu->pdu_type){ 840 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 841 // control pdus can go through directly 842 btstack_assert(mesh_pdu_ctl(pdu) != 0); 843 (void) btstack_linked_list_pop(&upper_transport_outgoing); 844 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 845 break; 846 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 847 // control pdus can go through directly 848 btstack_assert(mesh_pdu_ctl(pdu) != 0); 849 (void) btstack_linked_list_pop(&upper_transport_outgoing); 850 mesh_upper_transport_send_segmented_control_pdu((mesh_upper_transport_pdu_t *) pdu); 851 break; 852 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 853 // segmented access pdus required a mesh-segmented-pdu 854 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 855 if (upper_pdu->lower_pdu == NULL){ 856 segmented_pdu = btstack_memory_mesh_segmented_pdu_get(); 857 } 858 if (segmented_pdu == NULL) break; 859 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 860 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 861 // and a mesh-network-pdu for each segment in upper pdu 862 ok = mesh_segmented_allocate_segments(&segmented_pdu->segments, upper_pdu->len + upper_pdu->transmic_len); 863 if (!ok) break; 864 // all buffers available, get started 865 (void) btstack_linked_list_pop(&upper_transport_outgoing); 866 mesh_upper_transport_send_access(upper_pdu); 867 break; 868 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 869 // unsegmented access pdus require a single mesh-network-dpu 870 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 871 if (upper_pdu->lower_pdu == NULL){ 872 upper_pdu->lower_pdu = (mesh_pdu_t *) mesh_network_pdu_get(); 873 } 874 if (upper_pdu->lower_pdu == NULL) break; 875 (void) btstack_linked_list_pop(&upper_transport_outgoing); 876 mesh_upper_transport_send_access((mesh_upper_transport_pdu_t *) pdu); 877 break; 878 default: 879 btstack_assert(false); 880 break; 881 } 882 } 883 } 884 885 static mesh_upper_transport_pdu_t * mesh_upper_transport_find_pdu_for_lower(mesh_pdu_t * pdu_to_find){ 886 btstack_linked_list_iterator_t it; 887 btstack_linked_list_iterator_init(&it, &upper_transport_outgoing_active); 888 mesh_upper_transport_pdu_t * upper_pdu; 889 while (btstack_linked_list_iterator_has_next(&it)){ 890 mesh_pdu_t * mesh_pdu = (mesh_pdu_t *) btstack_linked_list_iterator_next(&it); 891 switch (mesh_pdu->pdu_type){ 892 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 893 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 894 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 895 upper_pdu = (mesh_upper_transport_pdu_t *) mesh_pdu; 896 if (upper_pdu->lower_pdu == pdu_to_find){ 897 btstack_linked_list_iterator_remove(&it); 898 return upper_pdu; 899 } 900 break; 901 default: 902 break; 903 } 904 } 905 return NULL; 906 } 907 908 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 909 mesh_upper_transport_pdu_t * upper_pdu; 910 mesh_network_pdu_t * network_pdu; 911 mesh_segmented_pdu_t * segmented_pdu; 912 switch (callback_type){ 913 case MESH_TRANSPORT_PDU_RECEIVED: 914 mesh_upper_transport_message_received(pdu); 915 break; 916 case MESH_TRANSPORT_PDU_SENT: 917 switch (pdu->pdu_type){ 918 case MESH_PDU_TYPE_SEGMENTED: 919 // try to find in outgoing active 920 upper_pdu = mesh_upper_transport_find_pdu_for_lower(pdu); 921 btstack_assert(upper_pdu != NULL); 922 segmented_pdu = (mesh_segmented_pdu_t *) pdu; 923 // free chunks 924 while (!btstack_linked_list_empty(&segmented_pdu->segments)){ 925 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&segmented_pdu->segments); 926 mesh_network_pdu_free(network_pdu); 927 } 928 // free segmented pdu 929 btstack_memory_mesh_segmented_pdu_free(segmented_pdu); 930 // TODO: free segmented_pdu 931 upper_pdu->lower_pdu = NULL; 932 switch (upper_pdu->pdu_header.pdu_type){ 933 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 934 mesh_control_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 935 break; 936 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 937 mesh_access_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 938 break; 939 default: 940 btstack_assert(false); 941 break; 942 } 943 break; 944 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 945 // find corresponding upper transport pdu and free single segment 946 upper_pdu = mesh_upper_transport_find_pdu_for_lower(pdu); 947 btstack_assert(upper_pdu != NULL); 948 btstack_assert(upper_pdu->lower_pdu == (mesh_pdu_t *) pdu); 949 mesh_network_pdu_free((mesh_network_pdu_t *) pdu); 950 upper_pdu->lower_pdu = NULL; 951 mesh_access_message_handler(callback_type, status, (mesh_pdu_t*) upper_pdu); 952 break; 953 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 954 mesh_access_message_handler(callback_type, status, pdu); 955 break; 956 default: 957 btstack_assert(false); 958 break; 959 } 960 mesh_upper_transport_run(); 961 break; 962 default: 963 break; 964 } 965 } 966 967 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 968 mesh_network_pdu_t * network_pdu; 969 mesh_segmented_pdu_t * message_pdu; 970 switch (pdu->pdu_type) { 971 case MESH_PDU_TYPE_NETWORK: 972 network_pdu = (mesh_network_pdu_t *) pdu; 973 mesh_network_pdu_free(network_pdu); 974 break; 975 case MESH_PDU_TYPE_SEGMENTED: 976 message_pdu = (mesh_segmented_pdu_t *) pdu; 977 mesh_message_pdu_free(message_pdu); 978 default: 979 btstack_assert(false); 980 break; 981 } 982 } 983 984 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 985 crypto_active = 0; 986 switch (pdu->pdu_type){ 987 case MESH_PDU_TYPE_ACCESS: 988 mesh_upper_transport_process_access_message_done((mesh_access_pdu_t *) pdu); 989 case MESH_PDU_TYPE_CONTROL: 990 mesh_upper_transport_process_control_message_done((mesh_control_pdu_t *) pdu); 991 break; 992 default: 993 btstack_assert(0); 994 break; 995 } 996 } 997 998 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 999 switch (pdu->pdu_type){ 1000 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1001 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1002 break; 1003 default: 1004 btstack_assert(false); 1005 break; 1006 } 1007 1008 btstack_assert(((mesh_upper_transport_pdu_t *) pdu)->lower_pdu == NULL); 1009 1010 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1011 mesh_upper_transport_run(); 1012 } 1013 1014 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 1015 switch (pdu->pdu_type){ 1016 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1017 break; 1018 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1019 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 1020 break; 1021 default: 1022 btstack_assert(false); 1023 break; 1024 } 1025 1026 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1027 mesh_upper_transport_run(); 1028 } 1029 1030 static uint8_t mesh_upper_transport_setup_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, 1031 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1032 1033 if (control_pdu_len > 11) return 1; 1034 1035 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1036 if (!network_key) return 1; 1037 1038 uint8_t transport_pdu_data[12]; 1039 transport_pdu_data[0] = opcode; 1040 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 1041 uint16_t transport_pdu_len = control_pdu_len + 1; 1042 1043 // setup network_pdu 1044 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 1045 1046 return 0; 1047 } 1048 1049 static uint8_t mesh_upper_transport_setup_segmented_control_pdu(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, 1050 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1051 1052 if (control_pdu_len > 256) return 1; 1053 1054 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1055 if (!network_key) return 1; 1056 1057 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1058 upper_pdu->ctl_ttl = ttl; 1059 upper_pdu->src = src; 1060 upper_pdu->dst = dest; 1061 upper_pdu->transmic_len = 0; // no TransMIC for control 1062 upper_pdu->netkey_index = netkey_index; 1063 upper_pdu->akf_aid_control = opcode; 1064 1065 // allocate segments 1066 btstack_linked_list_t free_segments = NULL; 1067 bool ok = mesh_segmented_allocate_segments( &free_segments, control_pdu_len); 1068 if (!ok) return 1; 1069 // store control pdu 1070 mesh_segmented_store_payload(control_pdu_data, control_pdu_len, &free_segments, &upper_pdu->segments); 1071 upper_pdu->len = control_pdu_len; 1072 return 0; 1073 } 1074 1075 uint8_t mesh_upper_transport_setup_control_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, 1076 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1077 switch (pdu->pdu_type){ 1078 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1079 return mesh_upper_transport_setup_unsegmented_control_pdu((mesh_network_pdu_t *) pdu, netkey_index, ttl, src, dest, opcode, control_pdu_data, control_pdu_len); 1080 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1081 return mesh_upper_transport_setup_segmented_control_pdu((mesh_upper_transport_pdu_t *) pdu, netkey_index, ttl, src, dest, opcode, control_pdu_data, control_pdu_len); 1082 default: 1083 btstack_assert(0); 1084 return 1; 1085 } 1086 } 1087 1088 static uint8_t mesh_upper_transport_setup_segmented_access_pdu_header(mesh_access_pdu_t * access_pdu, uint16_t netkey_index, 1089 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1090 1091 // get app or device key 1092 const mesh_transport_key_t *appkey; 1093 appkey = mesh_transport_key_get(appkey_index); 1094 if (appkey == NULL) { 1095 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 1096 return 1; 1097 } 1098 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1099 1100 // lookup network by netkey_index 1101 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 1102 if (!network_key) return 1; 1103 if (network_key == NULL) { 1104 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 1105 return 1; 1106 } 1107 1108 const uint8_t trans_mic_len = szmic ? 8 : 4; 1109 1110 // store in transport pdu 1111 access_pdu->transmic_len = trans_mic_len; 1112 access_pdu->netkey_index = netkey_index; 1113 access_pdu->appkey_index = appkey_index; 1114 access_pdu->akf_aid_control = akf_aid; 1115 uint8_t iviNid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1116 access_pdu->ivi_nid = iviNid; 1117 access_pdu->src = src; 1118 access_pdu->dst = dest; 1119 access_pdu->ctl_ttl = ttl; 1120 return 0; 1121 } 1122 1123 static uint8_t mesh_upper_transport_setup_upper_access_pdu_header(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, 1124 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1125 1126 // get app or device key 1127 const mesh_transport_key_t *appkey; 1128 appkey = mesh_transport_key_get(appkey_index); 1129 if (appkey == NULL) { 1130 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 1131 return 1; 1132 } 1133 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1134 1135 // lookup network by netkey_index 1136 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 1137 if (!network_key) return 1; 1138 if (network_key == NULL) { 1139 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 1140 return 1; 1141 } 1142 1143 const uint8_t trans_mic_len = szmic ? 8 : 4; 1144 1145 // store in transport pdu 1146 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1147 upper_pdu->ctl_ttl = ttl; 1148 upper_pdu->src = src; 1149 upper_pdu->dst = dest; 1150 upper_pdu->transmic_len = trans_mic_len; 1151 upper_pdu->netkey_index = netkey_index; 1152 upper_pdu->appkey_index = appkey_index; 1153 upper_pdu->akf_aid_control = akf_aid; 1154 return 0; 1155 } 1156 1157 static uint8_t mesh_upper_transport_setup_upper_access_pdu(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, 1158 uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 1159 int status = mesh_upper_transport_setup_upper_access_pdu_header(upper_pdu, netkey_index, appkey_index, ttl, src, 1160 dest, szmic); 1161 if (status) return status; 1162 1163 // allocate segments 1164 btstack_linked_list_t free_segments = NULL; 1165 bool ok = mesh_segmented_allocate_segments( &free_segments, access_pdu_len); 1166 if (!ok) return 1; 1167 // store control pdu 1168 mesh_segmented_store_payload(access_pdu_data, access_pdu_len, &free_segments, &upper_pdu->segments); 1169 upper_pdu->len = access_pdu_len; 1170 return 0; 1171 } 1172 1173 1174 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 1175 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1176 switch (pdu->pdu_type){ 1177 case MESH_PDU_TYPE_ACCESS: 1178 return mesh_upper_transport_setup_segmented_access_pdu_header((mesh_access_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 1179 default: 1180 btstack_assert(false); 1181 return 1; 1182 } 1183 } 1184 1185 uint8_t mesh_upper_transport_setup_access_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 1186 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic, 1187 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 1188 switch (pdu->pdu_type){ 1189 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1190 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1191 return mesh_upper_transport_setup_upper_access_pdu((mesh_upper_transport_pdu_t *) pdu, netkey_index, 1192 appkey_index, ttl, src, dest, szmic, access_pdu_data, 1193 access_pdu_len); 1194 default: 1195 btstack_assert(false); 1196 return 1; 1197 } 1198 } 1199 1200 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)) { 1201 mesh_access_message_handler = callback; 1202 } 1203 1204 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)){ 1205 mesh_control_message_handler = callback; 1206 } 1207 1208 void mesh_upper_transport_init(){ 1209 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1210 } 1211