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