1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "mesh_upper_transport.c" 39 40 #include "mesh/mesh_upper_transport.h" 41 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #include "btstack_util.h" 47 #include "btstack_memory.h" 48 #include "btstack_debug.h" 49 50 #include "mesh/beacon.h" 51 #include "mesh/mesh_iv_index_seq_number.h" 52 #include "mesh/mesh_keys.h" 53 #include "mesh/mesh_lower_transport.h" 54 #include "mesh/mesh_peer.h" 55 #include "mesh/mesh_virtual_addresses.h" 56 57 // TODO: extract mesh_pdu functions into lower transport or network 58 #include "mesh/mesh_access.h" 59 60 // combined key x address iterator for upper transport decryption 61 62 typedef struct { 63 // state 64 mesh_transport_key_iterator_t key_it; 65 mesh_virtual_address_iterator_t address_it; 66 // elements 67 const mesh_transport_key_t * key; 68 const mesh_virtual_address_t * address; 69 // address - might be virtual 70 uint16_t dst; 71 // key info 72 } mesh_transport_key_and_virtual_address_iterator_t; 73 74 static void mesh_upper_transport_validate_segmented_message(void); 75 static void mesh_upper_transport_run(void); 76 77 static int crypto_active; 78 79 static mesh_unsegmented_pdu_t * incoming_unsegmented_pdu_raw; 80 81 static mesh_segmented_pdu_t incoming_message_pdu_singleton; 82 83 static mesh_access_pdu_t * incoming_access_pdu_encrypted; 84 static mesh_access_pdu_t * incoming_access_pdu_decrypted; 85 86 static mesh_access_pdu_t incoming_access_pdu_encrypted_singleton; 87 static mesh_access_pdu_t incoming_access_pdu_decrypted_singleton; 88 89 static mesh_control_pdu_t incoming_control_pdu_singleton; 90 static mesh_control_pdu_t * incoming_control_pdu; 91 92 static mesh_segmented_pdu_t outgoing_segmented_pdu_singleton; 93 static mesh_unsegmented_pdu_t outgoing_unsegmented_pdu_singleton; 94 static mesh_upper_transport_pdu_t * outgoing_upper_transport_pdu; 95 96 static uint8_t application_nonce[13]; 97 static btstack_crypto_ccm_t ccm; 98 static uint8_t crypto_buffer[MESH_ACCESS_PAYLOAD_MAX]; 99 static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; 100 101 // upper transport callbacks - in access layer 102 static void (*mesh_access_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 103 static void (*mesh_control_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 104 105 // incoming unsegmented (network) and segmented (transport) control and access messages 106 static btstack_linked_list_t upper_transport_incoming; 107 108 // outgoing unsegmented (network) and segmented (uppert_transport_outgoing) control and access messages 109 static btstack_linked_list_t upper_transport_outgoing; 110 111 112 // TODO: higher layer define used for assert 113 #define MESH_ACCESS_OPCODE_NOT_SET 0xFFFFFFFEu 114 115 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 116 switch (pdu->pdu_type){ 117 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 118 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 119 break; 120 default: 121 btstack_assert(false); 122 break; 123 } 124 125 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 126 mesh_upper_transport_run(); 127 } 128 129 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 130 switch (pdu->pdu_type){ 131 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 132 break; 133 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 134 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 135 break; 136 default: 137 btstack_assert(false); 138 break; 139 } 140 141 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 142 mesh_upper_transport_run(); 143 } 144 145 static void mesh_print_hex(const char * name, const uint8_t * data, uint16_t len){ 146 printf("%-20s ", name); 147 printf_hexdump(data, len); 148 } 149 // static void mesh_print_x(const char * name, uint32_t value){ 150 // printf("%20s: 0x%x", name, (int) value); 151 // } 152 153 static void mesh_transport_key_and_virtual_address_iterator_init(mesh_transport_key_and_virtual_address_iterator_t *it, 154 uint16_t dst, uint16_t netkey_index, uint8_t akf, 155 uint8_t aid) { 156 printf("KEY_INIT: dst %04x, akf %x, aid %x\n", dst, akf, aid); 157 // config 158 it->dst = dst; 159 // init elements 160 it->key = NULL; 161 it->address = NULL; 162 // init element iterators 163 mesh_transport_key_aid_iterator_init(&it->key_it, netkey_index, akf, aid); 164 // init address iterator 165 if (mesh_network_address_virtual(it->dst)){ 166 mesh_virtual_address_iterator_init(&it->address_it, dst); 167 // get first key 168 if (mesh_transport_key_aid_iterator_has_more(&it->key_it)) { 169 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 170 } 171 } 172 } 173 174 // cartesian product: keys x addressses 175 static int mesh_transport_key_and_virtual_address_iterator_has_more(mesh_transport_key_and_virtual_address_iterator_t * it){ 176 if (mesh_network_address_virtual(it->dst)) { 177 // find next valid entry 178 while (true){ 179 if (mesh_virtual_address_iterator_has_more(&it->address_it)) return 1; 180 if (!mesh_transport_key_aid_iterator_has_more(&it->key_it)) return 0; 181 // get next key 182 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 183 mesh_virtual_address_iterator_init(&it->address_it, it->dst); 184 } 185 } else { 186 return mesh_transport_key_aid_iterator_has_more(&it->key_it); 187 } 188 } 189 190 static void mesh_transport_key_and_virtual_address_iterator_next(mesh_transport_key_and_virtual_address_iterator_t * it){ 191 if (mesh_network_address_virtual(it->dst)) { 192 it->address = mesh_virtual_address_iterator_get_next(&it->address_it); 193 } else { 194 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 195 } 196 } 197 198 // UPPER TRANSPORT 199 200 uint16_t mesh_access_dst(mesh_access_pdu_t * access_pdu){ 201 return big_endian_read_16(access_pdu->network_header, 7); 202 } 203 204 uint16_t mesh_access_ctl(mesh_access_pdu_t * access_pdu){ 205 return access_pdu->network_header[1] >> 7; 206 } 207 208 uint32_t mesh_access_seq(mesh_access_pdu_t * access_pdu){ 209 return big_endian_read_24(access_pdu->network_header, 2); 210 } 211 212 void mesh_access_set_nid_ivi(mesh_access_pdu_t * access_pdu, uint8_t nid_ivi){ 213 access_pdu->network_header[0] = nid_ivi; 214 } 215 void mesh_access_set_ctl_ttl(mesh_access_pdu_t * access_pdu, uint8_t ctl_ttl){ 216 access_pdu->network_header[1] = ctl_ttl; 217 } 218 void mesh_access_set_seq(mesh_access_pdu_t * access_pdu, uint32_t seq){ 219 big_endian_store_24(access_pdu->network_header, 2, seq); 220 } 221 void mesh_access_set_src(mesh_access_pdu_t * access_pdu, uint16_t src){ 222 big_endian_store_16(access_pdu->network_header, 5, src); 223 } 224 void mesh_access_set_dest(mesh_access_pdu_t * access_pdu, uint16_t dest){ 225 big_endian_store_16(access_pdu->network_header, 7, dest); 226 } 227 228 static void mesh_segmented_pdu_flatten(btstack_linked_list_t * segments, uint8_t segment_len, uint8_t * buffer) { 229 // assemble payload 230 btstack_linked_list_iterator_t it; 231 btstack_linked_list_iterator_init(&it, segments); 232 while (btstack_linked_list_iterator_has_next(&it)) { 233 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 234 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 235 // get segment n 236 uint8_t *lower_transport_pdu = mesh_network_pdu_data(segment); 237 uint8_t seg_o = (big_endian_read_16(lower_transport_pdu, 2) >> 5) & 0x001f; 238 uint8_t *segment_data = &lower_transport_pdu[4]; 239 (void) memcpy(&buffer[seg_o * segment_len], segment_data, segment_len); 240 } 241 } 242 243 static uint16_t mesh_upper_pdu_flatten(mesh_upper_transport_pdu_t * upper_pdu, uint8_t * buffer, uint16_t buffer_len) { 244 // assemble payload 245 btstack_linked_list_iterator_t it; 246 btstack_linked_list_iterator_init(&it, &upper_pdu->segments); 247 uint16_t offset = 0; 248 while (btstack_linked_list_iterator_has_next(&it)) { 249 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 250 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 251 btstack_assert((offset + segment->len) <= buffer_len); 252 (void) memcpy(&buffer[offset], segment->data, segment->len); 253 offset += segment->len; 254 } 255 return offset; 256 } 257 258 static void mesh_segmented_append_payload(const uint8_t * payload, uint16_t payload_len, btstack_linked_list_t * segments){ 259 uint16_t payload_offset = 0; 260 uint16_t bytes_current_segment = 0; 261 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_last_item(segments); 262 if (network_pdu){ 263 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX - network_pdu->len; 264 } 265 while (payload_offset < payload_len){ 266 if (bytes_current_segment == 0){ 267 network_pdu = mesh_network_pdu_get(); 268 btstack_assert(network_pdu != NULL); 269 btstack_linked_list_add_tail(segments, (btstack_linked_item_t *) network_pdu); 270 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX; 271 } 272 uint16_t bytes_to_copy = btstack_min(bytes_current_segment, payload_len - payload_offset); 273 (void) memcpy(&network_pdu->data[network_pdu->len], &payload[payload_offset], bytes_to_copy); 274 bytes_current_segment -= bytes_to_copy; 275 network_pdu->len += bytes_to_copy; 276 payload_offset += bytes_to_copy; 277 } 278 } 279 280 // stub lower transport 281 282 static void mesh_upper_transport_dump_pdus(const char *name, btstack_linked_list_t *list){ 283 printf("List: %s:\n", name); 284 btstack_linked_list_iterator_t it; 285 btstack_linked_list_iterator_init(&it, list); 286 while (btstack_linked_list_iterator_has_next(&it)){ 287 mesh_pdu_t * pdu = (mesh_pdu_t*) btstack_linked_list_iterator_next(&it); 288 printf("- %p\n", pdu); 289 // printf_hexdump( mesh_pdu_data(pdu), mesh_pdu_len(pdu)); 290 } 291 } 292 293 static void mesh_upper_transport_reset_pdus(btstack_linked_list_t *list){ 294 while (!btstack_linked_list_empty(list)){ 295 mesh_upper_transport_pdu_free((mesh_pdu_t *) btstack_linked_list_pop(list)); 296 } 297 } 298 299 void mesh_upper_transport_dump(void){ 300 printf("incoming_unsegmented_pdu_raw: %p\n", incoming_unsegmented_pdu_raw); 301 mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); 302 } 303 304 void mesh_upper_transport_reset(void){ 305 crypto_active = 0; 306 if (incoming_unsegmented_pdu_raw){ 307 mesh_network_pdu_t * network_pdu = incoming_unsegmented_pdu_raw->segment; 308 btstack_assert(network_pdu != NULL); 309 incoming_unsegmented_pdu_raw->segment = NULL; 310 mesh_network_pdu_free(network_pdu); 311 incoming_unsegmented_pdu_raw = NULL; 312 } 313 outgoing_upper_transport_pdu = NULL; 314 mesh_upper_transport_reset_pdus(&upper_transport_incoming); 315 } 316 317 static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ 318 // get IV Index and IVI 319 uint32_t iv_index = mesh_get_iv_index(); 320 int ivi = ivi_nid >> 7; 321 322 // if least significant bit differs, use previous IV Index 323 if ((iv_index & 1 ) ^ ivi){ 324 iv_index--; 325 } 326 return iv_index; 327 } 328 329 static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 330 mesh_access_pdu_t * access_pdu; 331 mesh_upper_transport_pdu_t * upper_pdu; 332 switch (pdu->pdu_type){ 333 case MESH_PDU_TYPE_ACCESS: 334 access_pdu = (mesh_access_pdu_t *) pdu; 335 nonce[1] = access_pdu->transmic_len == 8 ? 0x80 : 0x00; 336 (void)memcpy(&nonce[2], &access_pdu->network_header[2], 7); 337 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(access_pdu->network_header[0])); 338 break; 339 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 340 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 341 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 342 nonce[1] = upper_pdu->transmic_len == 8 ? 0x80 : 0x00; 343 // 'network header' 344 big_endian_store_24(nonce, 2, upper_pdu->seq); 345 big_endian_store_16(nonce, 5, upper_pdu->src); 346 big_endian_store_16(nonce, 7, upper_pdu->dst); 347 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(upper_pdu->ivi_nid)); 348 break; 349 default: 350 btstack_assert(0); 351 break; 352 } 353 } 354 355 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 356 nonce[0] = 0x01; 357 transport_segmented_setup_nonce(nonce, pdu); 358 mesh_print_hex("AppNonce", nonce, 13); 359 } 360 361 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 362 nonce[0] = 0x02; 363 transport_segmented_setup_nonce(nonce, pdu); 364 mesh_print_hex("DeviceNonce", nonce, 13); 365 } 366 367 static void mesh_upper_transport_process_message_done(mesh_segmented_pdu_t *message_pdu){ 368 crypto_active = 0; 369 btstack_assert(message_pdu == &incoming_message_pdu_singleton); 370 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&incoming_message_pdu_singleton.segments); 371 if (mesh_network_control(network_pdu)) { 372 btstack_assert(0); 373 } else { 374 btstack_assert(network_pdu != NULL); 375 mesh_network_pdu_free(network_pdu); 376 mesh_pdu_t * pdu = (mesh_pdu_t *) incoming_unsegmented_pdu_raw; 377 incoming_unsegmented_pdu_raw = NULL; 378 mesh_lower_transport_message_processed_by_higher_layer(pdu); 379 } 380 mesh_upper_transport_run(); 381 } 382 383 static void mesh_upper_transport_process_unsegmented_message_done(mesh_pdu_t * pdu){ 384 btstack_assert(pdu != NULL); 385 btstack_assert(pdu->pdu_type == MESH_PDU_TYPE_UNSEGMENTED); 386 387 mesh_unsegmented_pdu_t * unsegmented_incoming_pdu = (mesh_unsegmented_pdu_t *) pdu; 388 btstack_assert(unsegmented_incoming_pdu == incoming_unsegmented_pdu_raw); 389 390 crypto_active = 0; 391 incoming_unsegmented_pdu_raw = NULL; 392 mesh_network_pdu_t * network_pdu = unsegmented_incoming_pdu->segment; 393 if (!mesh_network_control(network_pdu)) { 394 mesh_network_pdu_free(network_pdu); 395 } 396 397 mesh_lower_transport_message_processed_by_higher_layer(pdu); 398 mesh_upper_transport_run(); 399 } 400 401 static void mesh_upper_transport_process_access_message_done(mesh_access_pdu_t *access_pdu){ 402 crypto_active = 0; 403 btstack_assert(mesh_access_ctl(access_pdu) == 0); 404 incoming_access_pdu_encrypted = NULL; 405 mesh_upper_transport_run(); 406 } 407 408 static void mesh_upper_transport_process_control_message_done(mesh_control_pdu_t * control_pdu){ 409 crypto_active = 0; 410 incoming_control_pdu = NULL; 411 mesh_upper_transport_run(); 412 } 413 414 static void mesh_upper_transport_validate_segmented_message_ccm(void * arg){ 415 UNUSED(arg); 416 417 uint8_t * upper_transport_pdu = incoming_access_pdu_decrypted->data; 418 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 419 420 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 421 422 // store TransMIC 423 uint8_t trans_mic[8]; 424 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 425 mesh_print_hex("TransMIC", trans_mic, incoming_access_pdu_decrypted->transmic_len); 426 427 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], incoming_access_pdu_decrypted->transmic_len) == 0){ 428 printf("TransMIC matches\n"); 429 430 // remove TransMIC from payload 431 incoming_access_pdu_decrypted->len -= incoming_access_pdu_decrypted->transmic_len; 432 433 // if virtual address, update dst to pseudo_dst 434 if (mesh_network_address_virtual(mesh_access_dst(incoming_access_pdu_decrypted))){ 435 big_endian_store_16(incoming_access_pdu_decrypted->network_header, 7, mesh_transport_key_it.address->pseudo_dst); 436 } 437 438 // pass to upper layer 439 btstack_assert(mesh_access_message_handler != NULL); 440 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_access_pdu_decrypted; 441 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 442 443 printf("\n"); 444 445 } else { 446 uint8_t akf = incoming_access_pdu_decrypted->akf_aid_control & 0x40; 447 if (akf){ 448 printf("TransMIC does not match, try next key\n"); 449 mesh_upper_transport_validate_segmented_message(); 450 } else { 451 printf("TransMIC does not match device key, done\n"); 452 // done 453 mesh_upper_transport_process_access_message_done(incoming_access_pdu_decrypted); 454 } 455 } 456 } 457 458 static void mesh_upper_transport_validate_segmented_message_digest(void * arg){ 459 UNUSED(arg); 460 uint8_t upper_transport_pdu_len = incoming_access_pdu_encrypted->len - incoming_access_pdu_encrypted->transmic_len; 461 uint8_t * upper_transport_pdu_data_in = incoming_access_pdu_encrypted->data; 462 uint8_t * upper_transport_pdu_data_out = incoming_access_pdu_decrypted->data; 463 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_in, upper_transport_pdu_data_out, &mesh_upper_transport_validate_segmented_message_ccm, NULL); 464 } 465 466 static void mesh_upper_transport_validate_segmented_message(void){ 467 uint8_t * upper_transport_pdu_data = incoming_access_pdu_decrypted->data; 468 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 469 470 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 471 printf("No valid transport key found\n"); 472 mesh_upper_transport_process_access_message_done(incoming_access_pdu_decrypted); 473 return; 474 } 475 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 476 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 477 478 if (message_key->akf){ 479 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) incoming_access_pdu_encrypted); 480 } else { 481 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) incoming_access_pdu_encrypted); 482 } 483 484 // store application / device key index 485 mesh_print_hex("AppOrDevKey", message_key->key, 16); 486 incoming_access_pdu_decrypted->appkey_index = message_key->appkey_index; 487 488 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 489 490 // decrypt ccm 491 crypto_active = 1; 492 uint16_t aad_len = 0; 493 if (mesh_network_address_virtual(mesh_access_dst(incoming_access_pdu_decrypted))){ 494 aad_len = 16; 495 } 496 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, incoming_access_pdu_decrypted->transmic_len); 497 498 if (aad_len){ 499 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_segmented_message_digest, NULL); 500 } else { 501 mesh_upper_transport_validate_segmented_message_digest(NULL); 502 } 503 } 504 505 static void mesh_upper_transport_process_segmented_message(void){ 506 // copy original pdu 507 (void)memcpy(incoming_access_pdu_decrypted, incoming_access_pdu_encrypted, 508 sizeof(mesh_access_pdu_t)); 509 510 // 511 uint8_t * upper_transport_pdu = incoming_access_pdu_decrypted->data; 512 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 513 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 514 515 uint8_t aid = incoming_access_pdu_decrypted->akf_aid_control & 0x3f; 516 uint8_t akf = (incoming_access_pdu_decrypted->akf_aid_control & 0x40) >> 6; 517 518 printf("AKF: %u\n", akf); 519 printf("AID: %02x\n", aid); 520 521 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_access_dst(incoming_access_pdu_decrypted), 522 incoming_access_pdu_decrypted->netkey_index, akf, aid); 523 mesh_upper_transport_validate_segmented_message(); 524 } 525 526 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 527 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 528 mesh_upper_transport_run(); 529 } 530 531 static void mesh_upper_transport_send_segmented_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 532 outgoing_upper_transport_pdu = upper_pdu; 533 mesh_segmented_pdu_t * message_pdu = &outgoing_segmented_pdu_singleton; 534 message_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 535 536 // lend segments to lower transport pdu 537 message_pdu->segments = upper_pdu->segments; 538 upper_pdu->segments = NULL; 539 540 // copy meta 541 message_pdu->len = upper_pdu->len; 542 message_pdu->netkey_index = upper_pdu->netkey_index; 543 message_pdu->transmic_len =0; // no TransMIC for control 544 message_pdu->akf_aid_control = upper_pdu->akf_aid_control; 545 message_pdu->flags = upper_pdu->flags; 546 547 // setup message_pdu header 548 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 549 message_pdu->network_header[0] = upper_pdu->ivi_nid; 550 message_pdu->network_header[1] = upper_pdu->ctl_ttl; 551 big_endian_store_24(message_pdu->network_header, 2, upper_pdu->seq); 552 big_endian_store_16(message_pdu->network_header, 5, upper_pdu->src); 553 big_endian_store_16(message_pdu->network_header, 7, upper_pdu->dst); 554 555 mesh_lower_transport_send_pdu((mesh_pdu_t*) message_pdu); 556 } 557 558 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, 559 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 560 561 if (control_pdu_len > 11) return 1; 562 563 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 564 if (!network_key) return 1; 565 566 uint8_t transport_pdu_data[12]; 567 transport_pdu_data[0] = opcode; 568 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 569 uint16_t transport_pdu_len = control_pdu_len + 1; 570 571 // setup network_pdu 572 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 573 574 return 0; 575 } 576 577 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, 578 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 579 580 if (control_pdu_len > 256) return 1; 581 582 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 583 if (!network_key) return 1; 584 585 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 586 upper_pdu->ctl_ttl = ttl; 587 upper_pdu->src = src; 588 upper_pdu->dst = dest; 589 upper_pdu->transmic_len = 0; // no TransMIC for control 590 upper_pdu->netkey_index = netkey_index; 591 upper_pdu->akf_aid_control = opcode; 592 593 mesh_segmented_append_payload(control_pdu_data, control_pdu_len, &upper_pdu->segments); 594 upper_pdu->len = control_pdu_len; 595 return 0; 596 } 597 598 uint8_t mesh_upper_transport_setup_control_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, 599 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 600 switch (pdu->pdu_type){ 601 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 602 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); 603 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 604 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); 605 default: 606 btstack_assert(0); 607 return 1; 608 } 609 } 610 611 static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu_header(mesh_unsegmented_pdu_t * unsegmented_pdu, uint16_t netkey_index, 612 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest){ 613 614 mesh_network_pdu_t * network_pdu = unsegmented_pdu->segment; 615 616 // get app or device key 617 const mesh_transport_key_t * appkey; 618 appkey = mesh_transport_key_get(appkey_index); 619 if (appkey == NULL){ 620 printf("appkey_index %x unknown\n", appkey_index); 621 return 1; 622 } 623 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 624 625 // lookup network by netkey_index 626 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 627 if (!network_key) return 1; 628 629 unsegmented_pdu->appkey_index = appkey_index; 630 631 network_pdu->data[9] = akf_aid; 632 // setup network_pdu 633 mesh_network_setup_pdu_header(network_pdu, netkey_index, network_key->nid, 0, ttl, 0, src, dest); 634 return 0; 635 } 636 637 static uint8_t mesh_upper_transport_setup_segmented_access_pdu_header(mesh_access_pdu_t * access_pdu, uint16_t netkey_index, 638 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 639 640 // get app or device key 641 const mesh_transport_key_t *appkey; 642 appkey = mesh_transport_key_get(appkey_index); 643 if (appkey == NULL) { 644 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 645 return 1; 646 } 647 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 648 649 // lookup network by netkey_index 650 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 651 if (!network_key) return 1; 652 if (network_key == NULL) { 653 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 654 return 1; 655 } 656 657 const uint8_t trans_mic_len = szmic ? 8 : 4; 658 659 // store in transport pdu 660 access_pdu->transmic_len = trans_mic_len; 661 access_pdu->netkey_index = netkey_index; 662 access_pdu->appkey_index = appkey_index; 663 access_pdu->akf_aid_control = akf_aid; 664 mesh_access_set_nid_ivi(access_pdu, network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7)); 665 mesh_access_set_src(access_pdu, src); 666 mesh_access_set_dest(access_pdu, dest); 667 mesh_access_set_ctl_ttl(access_pdu, ttl); 668 return 0; 669 } 670 671 static uint8_t mesh_upper_transport_setup_upper_access_pdu_header(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, 672 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 673 674 // get app or device key 675 const mesh_transport_key_t *appkey; 676 appkey = mesh_transport_key_get(appkey_index); 677 if (appkey == NULL) { 678 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 679 return 1; 680 } 681 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 682 683 // lookup network by netkey_index 684 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 685 if (!network_key) return 1; 686 if (network_key == NULL) { 687 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 688 return 1; 689 } 690 691 const uint8_t trans_mic_len = szmic ? 8 : 4; 692 693 // store in transport pdu 694 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 695 upper_pdu->ctl_ttl = ttl; 696 upper_pdu->src = src; 697 upper_pdu->dst = dest; 698 upper_pdu->transmic_len = trans_mic_len; 699 upper_pdu->netkey_index = netkey_index; 700 upper_pdu->appkey_index = appkey_index; 701 upper_pdu->akf_aid_control = akf_aid; 702 return 0; 703 } 704 705 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, 706 uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 707 int status = mesh_upper_transport_setup_upper_access_pdu_header(upper_pdu, netkey_index, appkey_index, ttl, src, 708 dest, szmic); 709 if (status) return status; 710 711 // store in transport pdu 712 mesh_segmented_append_payload(access_pdu_data, access_pdu_len, &upper_pdu->segments); 713 upper_pdu->len = access_pdu_len; 714 return 0; 715 } 716 717 718 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 719 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 720 switch (pdu->pdu_type){ 721 case MESH_PDU_TYPE_ACCESS: 722 return mesh_upper_transport_setup_segmented_access_pdu_header((mesh_access_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 723 case MESH_PDU_TYPE_UNSEGMENTED: 724 return mesh_upper_transport_setup_unsegmented_access_pdu_header((mesh_unsegmented_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest); 725 default: 726 btstack_assert(false); 727 return 1; 728 } 729 } 730 731 uint8_t mesh_upper_transport_setup_access_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 732 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic, 733 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 734 switch (pdu->pdu_type){ 735 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 736 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 737 return mesh_upper_transport_setup_upper_access_pdu((mesh_upper_transport_pdu_t *) pdu, netkey_index, 738 appkey_index, ttl, src, dest, szmic, access_pdu_data, 739 access_pdu_len); 740 default: 741 btstack_assert(false); 742 return 1; 743 } 744 } 745 746 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 747 // Device Key is fixed 748 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 749 return mesh_transport_key_get(appkey_index); 750 } 751 752 // Get key refresh state from subnet 753 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 754 if (subnet == NULL) return NULL; 755 756 // identify old and new app keys for given appkey_index 757 mesh_transport_key_t * old_key = NULL; 758 mesh_transport_key_t * new_key = NULL; 759 mesh_transport_key_iterator_t it; 760 mesh_transport_key_iterator_init(&it, netkey_index); 761 while (mesh_transport_key_iterator_has_more(&it)){ 762 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 763 if (transport_key->appkey_index != appkey_index) continue; 764 if (transport_key->old_key == 0) { 765 new_key = transport_key; 766 } else { 767 old_key = transport_key; 768 } 769 } 770 771 // if no key is marked as old, just use the current one 772 if (old_key == NULL) return new_key; 773 774 // use new key if it exists in phase two 775 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 776 return new_key; 777 } else { 778 return old_key; 779 } 780 } 781 782 static void mesh_upper_transport_send_upper_segmented_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 783 784 // TODO: store upper pdu in outgoing pdus active or similar 785 outgoing_upper_transport_pdu = upper_pdu; 786 787 mesh_segmented_pdu_t * message_pdu = &outgoing_segmented_pdu_singleton; 788 message_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 789 790 // convert mesh_access_pdu_t into mesh_segmented_pdu_t 791 mesh_segmented_append_payload(crypto_buffer, upper_pdu->len, &message_pdu->segments); 792 793 // copy meta 794 message_pdu->len = upper_pdu->len; 795 message_pdu->netkey_index = upper_pdu->netkey_index; 796 message_pdu->transmic_len = upper_pdu->transmic_len; 797 message_pdu->akf_aid_control = upper_pdu->akf_aid_control; 798 message_pdu->flags = upper_pdu->flags; 799 800 // setup message_pdu header 801 // (void)memcpy(message_pdu->network_header, upper_pdu->network_header, 9); 802 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 803 message_pdu->network_header[0] = upper_pdu->ivi_nid; 804 message_pdu->network_header[1] = upper_pdu->ctl_ttl; 805 big_endian_store_24(message_pdu->network_header, 2, upper_pdu->seq); 806 big_endian_store_16(message_pdu->network_header, 5, upper_pdu->src); 807 big_endian_store_16(message_pdu->network_header, 7, upper_pdu->dst); 808 809 mesh_lower_transport_send_pdu((mesh_pdu_t*) message_pdu); 810 } 811 812 static void mesh_upper_transport_send_upper_unsegmented_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 813 814 // TODO: store upper pdu in outgoing pdus active or similar 815 outgoing_upper_transport_pdu = upper_pdu; 816 817 mesh_unsegmented_pdu_t * unsegmented_pdu = &outgoing_unsegmented_pdu_singleton; 818 unsegmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UNSEGMENTED; 819 820 // provide segment 821 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 822 btstack_assert(network_pdu); 823 unsegmented_pdu->segment = network_pdu; 824 825 // setup network pdu 826 network_pdu->data[0] = upper_pdu->ivi_nid; 827 network_pdu->data[1] = upper_pdu->ctl_ttl; 828 big_endian_store_24(network_pdu->data, 2, upper_pdu->seq); 829 big_endian_store_16(network_pdu->data, 5, upper_pdu->src); 830 big_endian_store_16(network_pdu->data, 7, upper_pdu->dst); 831 network_pdu->netkey_index = upper_pdu->netkey_index; 832 833 // setup acess message 834 network_pdu->data[9] = upper_pdu->akf_aid_control; 835 btstack_assert(upper_pdu->len < 15); 836 (void)memcpy(&network_pdu->data[10], crypto_buffer, upper_pdu->len); 837 network_pdu->len = 10 + upper_pdu->len; 838 network_pdu->flags = 0; 839 840 mesh_lower_transport_send_pdu((mesh_pdu_t*) unsegmented_pdu); 841 } 842 843 static void mesh_upper_transport_send_upper_access_pdu_ccm(void * arg){ 844 crypto_active = 0; 845 846 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 847 mesh_print_hex("EncAccessPayload", crypto_buffer, upper_pdu->len); 848 // store TransMIC 849 btstack_crypto_ccm_get_authentication_value(&ccm, &crypto_buffer[upper_pdu->len]); 850 mesh_print_hex("TransMIC", &crypto_buffer[upper_pdu->len], upper_pdu->transmic_len); 851 upper_pdu->len += upper_pdu->transmic_len; 852 mesh_print_hex("UpperTransportPDU", crypto_buffer, upper_pdu->len); 853 switch (upper_pdu->pdu_header.pdu_type){ 854 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 855 mesh_upper_transport_send_upper_unsegmented_pdu(upper_pdu); 856 break; 857 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 858 mesh_upper_transport_send_upper_segmented_pdu(upper_pdu); 859 break; 860 default: 861 btstack_assert(false); 862 } 863 } 864 865 static void mesh_upper_transport_send_upper_access_pdu_digest(void *arg){ 866 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 867 uint16_t access_pdu_len = upper_pdu->len; 868 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, crypto_buffer, crypto_buffer, 869 &mesh_upper_transport_send_upper_access_pdu_ccm, upper_pdu); 870 } 871 872 static void mesh_upper_transport_send_upper_access_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 873 874 // if dst is virtual address, lookup label uuid and hash 875 uint16_t aad_len = 0; 876 mesh_virtual_address_t * virtual_address = NULL; 877 if (mesh_network_address_virtual(upper_pdu->dst)){ 878 virtual_address = mesh_virtual_address_for_pseudo_dst(upper_pdu->dst); 879 if (!virtual_address){ 880 printf("No virtual address register for pseudo dst %4x\n", upper_pdu->dst); 881 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 882 return; 883 } 884 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 885 // printf_hexdump(virtual_address->label_uuid, 16); 886 aad_len = 16; 887 upper_pdu->dst = virtual_address->hash; 888 } 889 890 // get app or device key 891 uint16_t appkey_index = upper_pdu->appkey_index; 892 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(upper_pdu->netkey_index, appkey_index); 893 if (appkey == NULL){ 894 printf("AppKey %04x not found, drop message\n", appkey_index); 895 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 896 return; 897 } 898 899 // reserve slot 900 mesh_lower_transport_reserve_slot(); 901 902 // reserve one sequence number, which is also used to encrypt access payload 903 uint32_t seq = mesh_sequence_number_next(); 904 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 905 upper_pdu->seq = seq; 906 907 // also reserves crypto_buffer 908 crypto_active = 1; 909 910 // flatten segmented pdu into crypto buffer 911 uint16_t payload_len = mesh_upper_pdu_flatten(upper_pdu, crypto_buffer, sizeof(crypto_buffer)); 912 btstack_assert(payload_len == upper_pdu->len); 913 914 // Dump PDU 915 printf("[+] Upper transport, send upper (un)segmented Access PDU - dest %04x, seq %06x\n", upper_pdu->dst, upper_pdu->seq); 916 mesh_print_hex("Access Payload", crypto_buffer, upper_pdu->len); 917 918 // setup nonce - uses dst, so after pseudo address translation 919 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 920 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 921 } else { 922 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 923 } 924 925 // Dump key 926 mesh_print_hex("AppOrDevKey", appkey->key, 16); 927 928 // encrypt ccm 929 uint8_t transmic_len = upper_pdu->transmic_len; 930 uint16_t access_pdu_len = upper_pdu->len; 931 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 932 if (virtual_address){ 933 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 934 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, 935 &mesh_upper_transport_send_upper_access_pdu_digest, upper_pdu); 936 } else { 937 mesh_upper_transport_send_upper_access_pdu_digest(upper_pdu); 938 } 939 } 940 941 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 942 // reserve slot 943 mesh_lower_transport_reserve_slot(); 944 // reserve sequence number 945 uint32_t seq = mesh_sequence_number_next(); 946 mesh_network_pdu_set_seq(network_pdu, seq); 947 // Dump PDU 948 uint8_t opcode = network_pdu->data[9]; 949 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 950 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 951 // wrap into mesh-unsegmented-pdu 952 outgoing_unsegmented_pdu_singleton.pdu_header.pdu_type = MESH_PDU_TYPE_UNSEGMENTED; 953 outgoing_unsegmented_pdu_singleton.segment = network_pdu; 954 outgoing_unsegmented_pdu_singleton.flags = MESH_TRANSPORT_FLAG_CONTROL; 955 956 // send 957 mesh_lower_transport_send_pdu((mesh_pdu_t *) &outgoing_unsegmented_pdu_singleton); 958 } 959 960 static void mesh_upper_transport_send_segmented_control_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 961 // reserve slot 962 mesh_lower_transport_reserve_slot(); 963 // reserve sequence number 964 uint32_t seq = mesh_sequence_number_next(); 965 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 966 upper_pdu->seq = seq; 967 // Dump PDU 968 // uint8_t opcode = upper_pdu->data[0]; 969 // printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", upper_pdu, seq, opcode); 970 // mesh_print_hex("Access Payload", &upper_pdu->data[1], upper_pdu->len - 1); 971 // send 972 mesh_upper_transport_send_segmented_pdu(upper_pdu); 973 } 974 975 static void mesh_upper_transport_run(void){ 976 977 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 978 979 if (crypto_active) return; 980 981 // get next message 982 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(&upper_transport_incoming); 983 mesh_network_pdu_t * network_pdu; 984 mesh_segmented_pdu_t * message_pdu; 985 mesh_unsegmented_pdu_t * unsegmented_pdu; 986 switch (pdu->pdu_type){ 987 case MESH_PDU_TYPE_UNSEGMENTED: 988 unsegmented_pdu = (mesh_unsegmented_pdu_t *) pdu; 989 network_pdu = unsegmented_pdu->segment; 990 btstack_assert(network_pdu != NULL); 991 // control? 992 if (mesh_network_control(network_pdu)) { 993 994 incoming_control_pdu = &incoming_control_pdu_singleton; 995 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 996 incoming_control_pdu->len = network_pdu->len; 997 incoming_control_pdu->netkey_index = network_pdu->netkey_index; 998 999 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 1000 1001 incoming_control_pdu->akf_aid_control = lower_transport_pdu[0]; 1002 incoming_control_pdu->len = network_pdu->len - 10; // 9 header + 1 opcode 1003 (void)memcpy(incoming_control_pdu->data, &lower_transport_pdu[1], incoming_control_pdu->len); 1004 1005 // copy meta data into encrypted pdu buffer 1006 (void)memcpy(incoming_control_pdu->network_header, network_pdu->data, 9); 1007 1008 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 1009 1010 // free mesh message 1011 mesh_lower_transport_message_processed_by_higher_layer(pdu); 1012 1013 btstack_assert(mesh_control_message_handler != NULL); 1014 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 1015 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 1016 1017 } else { 1018 1019 incoming_access_pdu_encrypted = &incoming_access_pdu_encrypted_singleton; 1020 incoming_access_pdu_encrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 1021 incoming_access_pdu_decrypted = &incoming_access_pdu_decrypted_singleton; 1022 1023 incoming_access_pdu_encrypted->netkey_index = network_pdu->netkey_index; 1024 incoming_access_pdu_encrypted->transmic_len = 4; 1025 1026 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 1027 1028 incoming_access_pdu_encrypted->akf_aid_control = lower_transport_pdu[0]; 1029 incoming_access_pdu_encrypted->len = network_pdu->len - 10; // 9 header + 1 AID 1030 (void)memcpy(incoming_access_pdu_encrypted->data, &lower_transport_pdu[1], incoming_access_pdu_encrypted->len); 1031 1032 // copy meta data into encrypted pdu buffer 1033 (void)memcpy(incoming_access_pdu_encrypted->network_header, network_pdu->data, 9); 1034 1035 mesh_print_hex("Assembled payload", incoming_access_pdu_encrypted->data, incoming_access_pdu_encrypted->len); 1036 1037 // free mesh message 1038 mesh_lower_transport_message_processed_by_higher_layer(pdu); 1039 1040 // get encoded transport pdu and start processing 1041 mesh_upper_transport_process_segmented_message(); 1042 } 1043 break; 1044 case MESH_PDU_TYPE_SEGMENTED: 1045 message_pdu = (mesh_segmented_pdu_t *) pdu; 1046 uint8_t ctl = mesh_message_ctl(message_pdu); 1047 if (ctl){ 1048 incoming_control_pdu= &incoming_control_pdu_singleton; 1049 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 1050 1051 // flatten 1052 mesh_segmented_pdu_flatten(&message_pdu->segments, 8, incoming_control_pdu->data); 1053 1054 // copy meta data into encrypted pdu buffer 1055 incoming_control_pdu->len = message_pdu->len; 1056 incoming_control_pdu->netkey_index = message_pdu->netkey_index; 1057 incoming_control_pdu->akf_aid_control = message_pdu->akf_aid_control; 1058 incoming_control_pdu->flags = 0; 1059 (void)memcpy(incoming_control_pdu->network_header, message_pdu->network_header, 9); 1060 1061 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 1062 1063 // free mesh message 1064 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 1065 1066 btstack_assert(mesh_control_message_handler != NULL); 1067 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 1068 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 1069 1070 } else { 1071 1072 incoming_access_pdu_encrypted = &incoming_access_pdu_encrypted_singleton; 1073 incoming_access_pdu_encrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 1074 incoming_access_pdu_decrypted = &incoming_access_pdu_decrypted_singleton; 1075 1076 // flatten 1077 mesh_segmented_pdu_flatten(&message_pdu->segments, 12, incoming_access_pdu_encrypted->data); 1078 1079 // copy meta data into encrypted pdu buffer 1080 incoming_access_pdu_encrypted->len = message_pdu->len; 1081 incoming_access_pdu_encrypted->netkey_index = message_pdu->netkey_index; 1082 incoming_access_pdu_encrypted->transmic_len = message_pdu->transmic_len; 1083 incoming_access_pdu_encrypted->akf_aid_control = message_pdu->akf_aid_control; 1084 (void)memcpy(incoming_access_pdu_encrypted->network_header, message_pdu->network_header, 9); 1085 1086 mesh_print_hex("Assembled payload", incoming_access_pdu_encrypted->data, incoming_access_pdu_encrypted->len); 1087 1088 // free mesh message 1089 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 1090 1091 // get encoded transport pdu and start processing 1092 mesh_upper_transport_process_segmented_message(); 1093 } 1094 break; 1095 default: 1096 btstack_assert(0); 1097 break; 1098 } 1099 } 1100 1101 while (!btstack_linked_list_empty(&upper_transport_outgoing)){ 1102 1103 if (crypto_active) break; 1104 1105 if (outgoing_upper_transport_pdu != NULL) break; 1106 1107 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_outgoing); 1108 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == 0) break; 1109 1110 (void) btstack_linked_list_pop(&upper_transport_outgoing); 1111 1112 mesh_unsegmented_pdu_t * unsegmented_pdu; 1113 1114 switch (pdu->pdu_type){ 1115 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1116 btstack_assert(mesh_pdu_ctl(pdu) != 0); 1117 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 1118 break; 1119 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1120 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1121 mesh_upper_transport_send_upper_access_pdu((mesh_upper_transport_pdu_t *) pdu); 1122 break; 1123 default: 1124 btstack_assert(false); 1125 break; 1126 } 1127 } 1128 } 1129 1130 1131 1132 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 1133 mesh_pdu_t * pdu_to_report; 1134 mesh_unsegmented_pdu_t * unsegmented_pdu; 1135 switch (callback_type){ 1136 case MESH_TRANSPORT_PDU_RECEIVED: 1137 mesh_upper_transport_message_received(pdu); 1138 break; 1139 case MESH_TRANSPORT_PDU_SENT: 1140 switch (pdu->pdu_type){ 1141 case MESH_PDU_TYPE_SEGMENTED: 1142 // free chunks 1143 while (!btstack_linked_list_empty(&outgoing_segmented_pdu_singleton.segments)){ 1144 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&outgoing_segmented_pdu_singleton.segments); 1145 mesh_network_pdu_free(network_pdu); 1146 } 1147 // notify upper layer but use transport pdu 1148 pdu_to_report = (mesh_pdu_t *) outgoing_upper_transport_pdu; 1149 outgoing_upper_transport_pdu = NULL; 1150 if (mesh_pdu_ctl(pdu_to_report)){ 1151 mesh_control_message_handler(callback_type, status, pdu_to_report); 1152 } else { 1153 mesh_access_message_handler(callback_type, status, pdu_to_report); 1154 } 1155 break; 1156 case MESH_PDU_TYPE_UNSEGMENTED: 1157 unsegmented_pdu = (mesh_unsegmented_pdu_t *) pdu; 1158 if (unsegmented_pdu == &outgoing_unsegmented_pdu_singleton){ 1159 if ((unsegmented_pdu->flags & MESH_TRANSPORT_FLAG_CONTROL) == 0){ 1160 // notify upper layer but use network pdu (control pdu) 1161 mesh_network_pdu_t * network_pdu = outgoing_unsegmented_pdu_singleton.segment; 1162 outgoing_unsegmented_pdu_singleton.segment = NULL; 1163 mesh_control_message_handler(callback_type, status, (mesh_pdu_t *) network_pdu); 1164 } else { 1165 // notify upper layer but use upper access pdu 1166 mesh_network_pdu_t * network_pdu = outgoing_unsegmented_pdu_singleton.segment; 1167 outgoing_unsegmented_pdu_singleton.segment = NULL; 1168 mesh_network_pdu_free(network_pdu); 1169 pdu_to_report = (mesh_pdu_t *) outgoing_upper_transport_pdu; 1170 mesh_access_message_handler(callback_type, status, pdu_to_report); 1171 } 1172 } else { 1173 btstack_assert((unsegmented_pdu->flags & MESH_TRANSPORT_FLAG_CONTROL) == 0); 1174 mesh_access_message_handler(callback_type, status, pdu); 1175 } 1176 break; 1177 default: 1178 btstack_assert(false); 1179 break; 1180 } 1181 mesh_upper_transport_run(); 1182 break; 1183 default: 1184 break; 1185 } 1186 } 1187 1188 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 1189 mesh_network_pdu_t * network_pdu; 1190 mesh_segmented_pdu_t * message_pdu; 1191 switch (pdu->pdu_type) { 1192 case MESH_PDU_TYPE_NETWORK: 1193 network_pdu = (mesh_network_pdu_t *) pdu; 1194 mesh_network_pdu_free(network_pdu); 1195 break; 1196 case MESH_PDU_TYPE_SEGMENTED: 1197 message_pdu = (mesh_segmented_pdu_t *) pdu; 1198 mesh_message_pdu_free(message_pdu); 1199 default: 1200 btstack_assert(false); 1201 break; 1202 } 1203 } 1204 1205 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 1206 crypto_active = 0; 1207 switch (pdu->pdu_type){ 1208 case MESH_PDU_TYPE_ACCESS: 1209 mesh_upper_transport_process_access_message_done((mesh_access_pdu_t *) pdu); 1210 case MESH_PDU_TYPE_CONTROL: 1211 mesh_upper_transport_process_control_message_done((mesh_control_pdu_t *) pdu); 1212 break; 1213 default: 1214 btstack_assert(0); 1215 break; 1216 } 1217 } 1218 1219 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)) { 1220 mesh_access_message_handler = callback; 1221 } 1222 1223 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)){ 1224 mesh_control_message_handler = callback; 1225 } 1226 1227 void mesh_upper_transport_init(){ 1228 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1229 } 1230