1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "mesh_upper_transport.c" 39 40 #include "mesh/mesh_upper_transport.h" 41 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #include "btstack_util.h" 47 #include "btstack_memory.h" 48 #include "btstack_debug.h" 49 #include "btstack_bool.h" 50 51 #include "mesh/beacon.h" 52 #include "mesh/mesh_iv_index_seq_number.h" 53 #include "mesh/mesh_keys.h" 54 #include "mesh/mesh_lower_transport.h" 55 #include "mesh/mesh_peer.h" 56 #include "mesh/mesh_virtual_addresses.h" 57 58 // TODO: extract mesh_pdu functions into lower transport or network 59 #include "mesh/mesh_access.h" 60 61 // combined key x address iterator for upper transport decryption 62 63 typedef struct { 64 // state 65 mesh_transport_key_iterator_t key_it; 66 mesh_virtual_address_iterator_t address_it; 67 // elements 68 const mesh_transport_key_t * key; 69 const mesh_virtual_address_t * address; 70 // address - might be virtual 71 uint16_t dst; 72 // key info 73 } mesh_transport_key_and_virtual_address_iterator_t; 74 75 static void mesh_upper_transport_validate_access_message(void); 76 static void mesh_upper_transport_run(void); 77 78 // upper transport callbacks - in access layer 79 static void (*mesh_access_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 80 static void (*mesh_control_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 81 82 // 83 static int crypto_active; 84 static uint8_t application_nonce[13]; 85 static btstack_crypto_ccm_t ccm; 86 static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; 87 88 // incoming segmented (mesh_segmented_pdu_t) or unsegmented (network_pdu_t) 89 static mesh_pdu_t * incoming_access_encrypted; 90 91 // multi-purpose union: segmented control reassembly, decrypted access pdu 92 static union { 93 mesh_control_pdu_t control; 94 mesh_access_pdu_t access; 95 } incoming_pdu_singleton; 96 97 // pointer to incoming_pdu_singleton.access 98 static mesh_access_pdu_t * incoming_access_decrypted; 99 100 // pointer to incoming_pdu_singleton.access 101 static mesh_control_pdu_t * incoming_control_pdu; 102 103 // incoming unsegmented (network) and segmented (transport) control and access messages 104 static btstack_linked_list_t upper_transport_incoming; 105 106 // outgoing unsegmented and segmented control and access messages 107 static btstack_linked_list_t upper_transport_outgoing; 108 109 // outgoing upper transport messages that have been sent to lower transport and wait for sent event 110 static btstack_linked_list_t upper_transport_outgoing_active; 111 112 // TODO: higher layer define used for assert 113 #define MESH_ACCESS_OPCODE_NOT_SET 0xFFFFFFFEu 114 115 static void mesh_print_hex(const char * name, const uint8_t * data, uint16_t len){ 116 printf("%-20s ", name); 117 printf_hexdump(data, len); 118 } 119 // static void mesh_print_x(const char * name, uint32_t value){ 120 // printf("%20s: 0x%x", name, (int) value); 121 // } 122 123 static void mesh_transport_key_and_virtual_address_iterator_init(mesh_transport_key_and_virtual_address_iterator_t *it, 124 uint16_t dst, uint16_t netkey_index, uint8_t akf, 125 uint8_t aid) { 126 printf("KEY_INIT: dst %04x, akf %x, aid %x\n", dst, akf, aid); 127 // config 128 it->dst = dst; 129 // init elements 130 it->key = NULL; 131 it->address = NULL; 132 // init element iterators 133 mesh_transport_key_aid_iterator_init(&it->key_it, netkey_index, akf, aid); 134 // init address iterator 135 if (mesh_network_address_virtual(it->dst)){ 136 mesh_virtual_address_iterator_init(&it->address_it, dst); 137 // get first key 138 if (mesh_transport_key_aid_iterator_has_more(&it->key_it)) { 139 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 140 } 141 } 142 } 143 144 // cartesian product: keys x addressses 145 static int mesh_transport_key_and_virtual_address_iterator_has_more(mesh_transport_key_and_virtual_address_iterator_t * it){ 146 if (mesh_network_address_virtual(it->dst)) { 147 // find next valid entry 148 while (true){ 149 if (mesh_virtual_address_iterator_has_more(&it->address_it)) return 1; 150 if (!mesh_transport_key_aid_iterator_has_more(&it->key_it)) return 0; 151 // get next key 152 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 153 mesh_virtual_address_iterator_init(&it->address_it, it->dst); 154 } 155 } else { 156 return mesh_transport_key_aid_iterator_has_more(&it->key_it); 157 } 158 } 159 160 static void mesh_transport_key_and_virtual_address_iterator_next(mesh_transport_key_and_virtual_address_iterator_t * it){ 161 if (mesh_network_address_virtual(it->dst)) { 162 it->address = mesh_virtual_address_iterator_get_next(&it->address_it); 163 } else { 164 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 165 } 166 } 167 168 // UPPER TRANSPORT 169 170 uint16_t mesh_access_dst(mesh_access_pdu_t * access_pdu){ 171 return access_pdu->dst; 172 } 173 174 uint16_t mesh_access_ctl(mesh_access_pdu_t * access_pdu){ 175 return access_pdu->ctl_ttl >> 7; 176 } 177 178 uint32_t mesh_access_seq(mesh_access_pdu_t * access_pdu){ 179 return access_pdu->seq; 180 } 181 182 void mesh_access_set_ivi_nid(mesh_access_pdu_t * access_pdu, uint8_t ivi_nid){ 183 access_pdu->ivi_nid = ivi_nid; 184 } 185 void mesh_access_set_ctl_ttl(mesh_access_pdu_t * access_pdu, uint8_t ctl_ttl){ 186 access_pdu->ctl_ttl = ctl_ttl; 187 } 188 void mesh_access_set_seq(mesh_access_pdu_t * access_pdu, uint32_t seq){ 189 access_pdu->seq = seq; 190 } 191 void mesh_access_set_src(mesh_access_pdu_t * access_pdu, uint16_t src){ 192 access_pdu->src = src; 193 } 194 void mesh_access_set_dest(mesh_access_pdu_t * access_pdu, uint16_t dst){ 195 access_pdu->dst = dst; 196 } 197 198 static void mesh_segmented_pdu_flatten(btstack_linked_list_t * segments, uint8_t segment_len, uint8_t * buffer) { 199 // assemble payload 200 btstack_linked_list_iterator_t it; 201 btstack_linked_list_iterator_init(&it, segments); 202 while (btstack_linked_list_iterator_has_next(&it)) { 203 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 204 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 205 // get segment n 206 uint8_t *lower_transport_pdu = mesh_network_pdu_data(segment); 207 uint8_t seg_o = (big_endian_read_16(lower_transport_pdu, 2) >> 5) & 0x001f; 208 uint8_t *segment_data = &lower_transport_pdu[4]; 209 (void) memcpy(&buffer[seg_o * segment_len], segment_data, segment_len); 210 } 211 } 212 213 static uint16_t mesh_upper_pdu_flatten(mesh_upper_transport_pdu_t * upper_pdu, uint8_t * buffer, uint16_t buffer_len) { 214 // assemble payload 215 btstack_linked_list_iterator_t it; 216 btstack_linked_list_iterator_init(&it, &upper_pdu->segments); 217 uint16_t offset = 0; 218 while (btstack_linked_list_iterator_has_next(&it)) { 219 mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); 220 btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); 221 btstack_assert((offset + segment->len) <= buffer_len); 222 (void) memcpy(&buffer[offset], segment->data, segment->len); 223 offset += segment->len; 224 } 225 return offset; 226 } 227 228 // store payload in provided list of network pdus 229 static void mesh_segmented_store_payload(const uint8_t * payload, uint16_t payload_len, btstack_linked_list_t * in_segments, btstack_linked_list_t * out_segments){ 230 uint16_t payload_offset = 0; 231 uint16_t bytes_current_segment = 0; 232 mesh_network_pdu_t * network_pdu = NULL; 233 while (payload_offset < payload_len){ 234 if (bytes_current_segment == 0){ 235 network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(in_segments); 236 btstack_assert(network_pdu != NULL); 237 btstack_linked_list_add_tail(out_segments, (btstack_linked_item_t *) network_pdu); 238 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX; 239 } 240 uint16_t bytes_to_copy = btstack_min(bytes_current_segment, payload_len - payload_offset); 241 (void) memcpy(&network_pdu->data[network_pdu->len], &payload[payload_offset], bytes_to_copy); 242 bytes_current_segment -= bytes_to_copy; 243 network_pdu->len += bytes_to_copy; 244 payload_offset += bytes_to_copy; 245 } 246 } 247 248 // tries allocate and add enough segments to store payload of given size 249 static bool mesh_segmented_allocate_segments(btstack_linked_list_t * segments, uint16_t payload_len){ 250 uint16_t storage_size = btstack_linked_list_count(segments) * MESH_NETWORK_PAYLOAD_MAX; 251 while (storage_size < payload_len){ 252 mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); 253 if (network_pdu == NULL) break; 254 storage_size += MESH_NETWORK_PAYLOAD_MAX; 255 btstack_linked_list_add(segments, (btstack_linked_item_t *) network_pdu); 256 } 257 return (storage_size >= payload_len); 258 } 259 260 // stub lower transport 261 262 static void mesh_upper_transport_dump_pdus(const char *name, btstack_linked_list_t *list){ 263 printf("List: %s:\n", name); 264 btstack_linked_list_iterator_t it; 265 btstack_linked_list_iterator_init(&it, list); 266 while (btstack_linked_list_iterator_has_next(&it)){ 267 mesh_pdu_t * pdu = (mesh_pdu_t*) btstack_linked_list_iterator_next(&it); 268 printf("- %p\n", pdu); 269 // printf_hexdump( mesh_pdu_data(pdu), mesh_pdu_len(pdu)); 270 } 271 } 272 273 static void mesh_upper_transport_reset_pdus(btstack_linked_list_t *list){ 274 while (!btstack_linked_list_empty(list)){ 275 mesh_upper_transport_pdu_free((mesh_pdu_t *) btstack_linked_list_pop(list)); 276 } 277 } 278 279 void mesh_upper_transport_dump(void){ 280 mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); 281 } 282 283 void mesh_upper_transport_reset(void){ 284 crypto_active = 0; 285 mesh_upper_transport_reset_pdus(&upper_transport_incoming); 286 } 287 288 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 289 // Device Key is fixed 290 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 291 return mesh_transport_key_get(appkey_index); 292 } 293 294 // Get key refresh state from subnet 295 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 296 if (subnet == NULL) return NULL; 297 298 // identify old and new app keys for given appkey_index 299 mesh_transport_key_t * old_key = NULL; 300 mesh_transport_key_t * new_key = NULL; 301 mesh_transport_key_iterator_t it; 302 mesh_transport_key_iterator_init(&it, netkey_index); 303 while (mesh_transport_key_iterator_has_more(&it)){ 304 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 305 if (transport_key->appkey_index != appkey_index) continue; 306 if (transport_key->old_key == 0) { 307 new_key = transport_key; 308 } else { 309 old_key = transport_key; 310 } 311 } 312 313 // if no key is marked as old, just use the current one 314 if (old_key == NULL) return new_key; 315 316 // use new key if it exists in phase two 317 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 318 return new_key; 319 } else { 320 return old_key; 321 } 322 } 323 324 static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ 325 // get IV Index and IVI 326 uint32_t iv_index = mesh_get_iv_index(); 327 int ivi = ivi_nid >> 7; 328 329 // if least significant bit differs, use previous IV Index 330 if ((iv_index & 1 ) ^ ivi){ 331 iv_index--; 332 } 333 return iv_index; 334 } 335 336 static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 337 mesh_access_pdu_t * access_pdu; 338 mesh_upper_transport_pdu_t * upper_pdu; 339 switch (pdu->pdu_type){ 340 case MESH_PDU_TYPE_ACCESS: 341 access_pdu = (mesh_access_pdu_t *) pdu; 342 nonce[1] = access_pdu->transmic_len == 8 ? 0x80 : 0x00; 343 big_endian_store_24(nonce, 2, access_pdu->seq); 344 big_endian_store_16(nonce, 5, access_pdu->src); 345 big_endian_store_16(nonce, 7, access_pdu->dst); 346 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(access_pdu->ivi_nid)); 347 break; 348 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 349 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 350 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 351 nonce[1] = upper_pdu->transmic_len == 8 ? 0x80 : 0x00; 352 // 'network header' 353 big_endian_store_24(nonce, 2, upper_pdu->seq); 354 big_endian_store_16(nonce, 5, upper_pdu->src); 355 big_endian_store_16(nonce, 7, upper_pdu->dst); 356 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(upper_pdu->ivi_nid)); 357 break; 358 default: 359 btstack_assert(0); 360 break; 361 } 362 } 363 364 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 365 nonce[0] = 0x01; 366 transport_segmented_setup_nonce(nonce, pdu); 367 mesh_print_hex("AppNonce", nonce, 13); 368 } 369 370 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 371 nonce[0] = 0x02; 372 transport_segmented_setup_nonce(nonce, pdu); 373 mesh_print_hex("DeviceNonce", nonce, 13); 374 } 375 376 static void mesh_upper_transport_process_access_message_done(mesh_access_pdu_t *access_pdu){ 377 crypto_active = 0; 378 btstack_assert(mesh_access_ctl(access_pdu) == 0); 379 mesh_lower_transport_message_processed_by_higher_layer(incoming_access_encrypted); 380 incoming_access_encrypted = NULL; 381 incoming_access_decrypted = NULL; 382 mesh_upper_transport_run(); 383 } 384 385 static void mesh_upper_transport_process_control_message_done(mesh_control_pdu_t * control_pdu){ 386 crypto_active = 0; 387 incoming_control_pdu = NULL; 388 mesh_upper_transport_run(); 389 } 390 391 static void mesh_upper_transport_validate_access_message_ccm(void * arg){ 392 UNUSED(arg); 393 394 uint8_t * upper_transport_pdu = incoming_access_decrypted->data; 395 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - incoming_access_decrypted->transmic_len; 396 397 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 398 399 // store TransMIC 400 uint8_t trans_mic[8]; 401 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 402 mesh_print_hex("TransMIC", trans_mic, incoming_access_decrypted->transmic_len); 403 404 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], incoming_access_decrypted->transmic_len) == 0){ 405 printf("TransMIC matches\n"); 406 407 // remove TransMIC from payload 408 incoming_access_decrypted->len -= incoming_access_decrypted->transmic_len; 409 410 // if virtual address, update dst to pseudo_dst 411 if (mesh_network_address_virtual(mesh_access_dst(incoming_access_decrypted))){ 412 incoming_access_decrypted->dst = mesh_transport_key_it.address->pseudo_dst; 413 } 414 415 // pass to upper layer 416 btstack_assert(mesh_access_message_handler != NULL); 417 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_access_decrypted; 418 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 419 420 printf("\n"); 421 422 } else { 423 uint8_t akf = incoming_access_decrypted->akf_aid_control & 0x40; 424 if (akf){ 425 printf("TransMIC does not match, try next key\n"); 426 mesh_upper_transport_validate_access_message(); 427 } else { 428 printf("TransMIC does not match device key, done\n"); 429 // done 430 mesh_upper_transport_process_access_message_done(incoming_access_decrypted); 431 } 432 } 433 } 434 435 static void mesh_upper_transport_validate_access_message_digest(void * arg){ 436 UNUSED(arg); 437 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - incoming_access_decrypted->transmic_len; 438 uint8_t * upper_transport_pdu_data_in = incoming_access_decrypted->data; 439 uint8_t * upper_transport_pdu_data_out = incoming_access_decrypted->data; 440 441 mesh_network_pdu_t * unsegmented_pdu = NULL; 442 mesh_segmented_pdu_t * segmented_pdu = NULL; 443 switch (incoming_access_encrypted->pdu_type){ 444 case MESH_PDU_TYPE_SEGMENTED: 445 segmented_pdu = (mesh_segmented_pdu_t *) incoming_access_encrypted; 446 mesh_segmented_pdu_flatten(&segmented_pdu->segments, 12, upper_transport_pdu_data_out); 447 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_out, upper_transport_pdu_data_out, 448 &mesh_upper_transport_validate_access_message_ccm, NULL); 449 break; 450 case MESH_PDU_TYPE_UNSEGMENTED: 451 unsegmented_pdu = (mesh_network_pdu_t *) incoming_access_encrypted; 452 (void)memcpy(upper_transport_pdu_data_out, &unsegmented_pdu->data[10], incoming_access_decrypted->len); 453 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_out, upper_transport_pdu_data_out, 454 &mesh_upper_transport_validate_access_message_ccm, NULL); 455 break; 456 default: 457 btstack_assert(false); 458 break; 459 } 460 461 } 462 463 static void mesh_upper_transport_validate_access_message(void){ 464 uint8_t * upper_transport_pdu_data = incoming_access_decrypted->data; 465 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - incoming_access_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_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_decrypted); 477 } else { 478 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) incoming_access_decrypted); 479 } 480 481 // store application / device key index 482 mesh_print_hex("AppOrDevKey", message_key->key, 16); 483 incoming_access_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_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_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, 497 &mesh_upper_transport_validate_access_message_digest, NULL); 498 } else { 499 mesh_upper_transport_validate_access_message_digest(NULL); 500 } 501 } 502 503 static void mesh_upper_transport_process_access_message(void){ 504 uint8_t * upper_transport_pdu = incoming_access_decrypted->data; 505 uint8_t upper_transport_pdu_len = incoming_access_decrypted->len - incoming_access_decrypted->transmic_len; 506 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 507 508 uint8_t aid = incoming_access_decrypted->akf_aid_control & 0x3f; 509 uint8_t akf = (incoming_access_decrypted->akf_aid_control & 0x40) >> 6; 510 511 printf("AKF: %u\n", akf); 512 printf("AID: %02x\n", aid); 513 514 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_access_dst(incoming_access_decrypted), 515 incoming_access_decrypted->netkey_index, akf, aid); 516 mesh_upper_transport_validate_access_message(); 517 } 518 519 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 520 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 521 mesh_upper_transport_run(); 522 } 523 524 static void mesh_upper_transport_send_access_segmented(mesh_upper_transport_pdu_t * upper_pdu){ 525 526 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 527 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 528 529 // convert mesh_access_pdu_t into mesh_segmented_pdu_t 530 btstack_linked_list_t free_segments = segmented_pdu->segments; 531 segmented_pdu->segments = NULL; 532 mesh_segmented_store_payload(incoming_pdu_singleton.access.data, upper_pdu->len, &free_segments, &segmented_pdu->segments); 533 534 // copy meta 535 segmented_pdu->len = upper_pdu->len; 536 segmented_pdu->netkey_index = upper_pdu->netkey_index; 537 segmented_pdu->transmic_len = upper_pdu->transmic_len; 538 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 539 segmented_pdu->flags = upper_pdu->flags; 540 541 // setup segmented_pdu header 542 // (void)memcpy(segmented_pdu->network_header, upper_pdu->network_header, 9); 543 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 544 segmented_pdu->network_header[0] = upper_pdu->ivi_nid; 545 segmented_pdu->network_header[1] = upper_pdu->ctl_ttl; 546 big_endian_store_24(segmented_pdu->network_header, 2, upper_pdu->seq); 547 big_endian_store_16(segmented_pdu->network_header, 5, upper_pdu->src); 548 big_endian_store_16(segmented_pdu->network_header, 7, upper_pdu->dst); 549 550 // queue up 551 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 552 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 553 554 mesh_lower_transport_send_pdu((mesh_pdu_t*) segmented_pdu); 555 } 556 557 static void mesh_upper_transport_send_access_unsegmented(mesh_upper_transport_pdu_t * upper_pdu){ 558 559 // provide segment 560 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) upper_pdu->lower_pdu; 561 562 // setup network pdu 563 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS; 564 network_pdu->data[0] = upper_pdu->ivi_nid; 565 network_pdu->data[1] = upper_pdu->ctl_ttl; 566 big_endian_store_24(network_pdu->data, 2, upper_pdu->seq); 567 big_endian_store_16(network_pdu->data, 5, upper_pdu->src); 568 big_endian_store_16(network_pdu->data, 7, upper_pdu->dst); 569 network_pdu->netkey_index = upper_pdu->netkey_index; 570 571 // setup access message 572 network_pdu->data[9] = upper_pdu->akf_aid_control; 573 btstack_assert(upper_pdu->len < 15); 574 (void)memcpy(&network_pdu->data[10], &incoming_pdu_singleton.access.data, upper_pdu->len); 575 network_pdu->len = 10 + upper_pdu->len; 576 network_pdu->flags = 0; 577 578 // queue up 579 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 580 581 mesh_lower_transport_send_pdu((mesh_pdu_t*) network_pdu); 582 } 583 584 static void mesh_upper_transport_send_access_ccm(void * arg){ 585 crypto_active = 0; 586 587 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 588 mesh_print_hex("EncAccessPayload", incoming_pdu_singleton.access.data, upper_pdu->len); 589 // store TransMIC 590 btstack_crypto_ccm_get_authentication_value(&ccm, &incoming_pdu_singleton.access.data[upper_pdu->len]); 591 mesh_print_hex("TransMIC", &incoming_pdu_singleton.access.data[upper_pdu->len], upper_pdu->transmic_len); 592 upper_pdu->len += upper_pdu->transmic_len; 593 mesh_print_hex("UpperTransportPDU", incoming_pdu_singleton.access.data, upper_pdu->len); 594 switch (upper_pdu->pdu_header.pdu_type){ 595 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 596 mesh_upper_transport_send_access_unsegmented(upper_pdu); 597 break; 598 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 599 mesh_upper_transport_send_access_segmented(upper_pdu); 600 break; 601 default: 602 btstack_assert(false); 603 } 604 } 605 606 static void mesh_upper_transport_send_access_digest(void *arg){ 607 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 608 uint16_t access_pdu_len = upper_pdu->len; 609 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, incoming_pdu_singleton.access.data, incoming_pdu_singleton.access.data, 610 &mesh_upper_transport_send_access_ccm, upper_pdu); 611 } 612 613 static void mesh_upper_transport_send_access(mesh_upper_transport_pdu_t * upper_pdu){ 614 615 // if dst is virtual address, lookup label uuid and hash 616 uint16_t aad_len = 0; 617 mesh_virtual_address_t * virtual_address = NULL; 618 if (mesh_network_address_virtual(upper_pdu->dst)){ 619 virtual_address = mesh_virtual_address_for_pseudo_dst(upper_pdu->dst); 620 if (!virtual_address){ 621 printf("No virtual address register for pseudo dst %4x\n", upper_pdu->dst); 622 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 623 return; 624 } 625 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 626 // printf_hexdump(virtual_address->label_uuid, 16); 627 aad_len = 16; 628 upper_pdu->dst = virtual_address->hash; 629 } 630 631 // get app or device key 632 uint16_t appkey_index = upper_pdu->appkey_index; 633 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(upper_pdu->netkey_index, appkey_index); 634 if (appkey == NULL){ 635 printf("AppKey %04x not found, drop message\n", appkey_index); 636 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 637 return; 638 } 639 640 // reserve slot 641 mesh_lower_transport_reserve_slot(); 642 643 // reserve one sequence number, which is also used to encrypt access payload 644 uint32_t seq = mesh_sequence_number_next(); 645 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 646 upper_pdu->seq = seq; 647 648 // also reserves crypto_buffer 649 crypto_active = 1; 650 651 // flatten segmented pdu into crypto buffer 652 uint16_t payload_len = mesh_upper_pdu_flatten(upper_pdu, incoming_pdu_singleton.access.data, sizeof(incoming_pdu_singleton.access.data)); 653 btstack_assert(payload_len == upper_pdu->len); 654 655 // Dump PDU 656 printf("[+] Upper transport, send upper (un)segmented Access PDU - dest %04x, seq %06x\n", upper_pdu->dst, upper_pdu->seq); 657 mesh_print_hex("Access Payload", incoming_pdu_singleton.access.data, upper_pdu->len); 658 659 // setup nonce - uses dst, so after pseudo address translation 660 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 661 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 662 } else { 663 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 664 } 665 666 // Dump key 667 mesh_print_hex("AppOrDevKey", appkey->key, 16); 668 669 // encrypt ccm 670 uint8_t transmic_len = upper_pdu->transmic_len; 671 uint16_t access_pdu_len = upper_pdu->len; 672 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 673 if (virtual_address){ 674 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 675 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, 676 &mesh_upper_transport_send_access_digest, upper_pdu); 677 } else { 678 mesh_upper_transport_send_access_digest(upper_pdu); 679 } 680 } 681 682 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 683 // reserve slot 684 mesh_lower_transport_reserve_slot(); 685 // reserve sequence number 686 uint32_t seq = mesh_sequence_number_next(); 687 mesh_network_pdu_set_seq(network_pdu, seq); 688 // Dump PDU 689 uint8_t opcode = network_pdu->data[9]; 690 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 691 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 692 693 // send 694 mesh_lower_transport_send_pdu((mesh_pdu_t *) network_pdu); 695 } 696 697 static void mesh_upper_transport_send_segmented_control_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 698 // reserve slot 699 mesh_lower_transport_reserve_slot(); 700 // reserve sequence number 701 uint32_t seq = mesh_sequence_number_next(); 702 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 703 upper_pdu->seq = seq; 704 // Dump PDU 705 // uint8_t opcode = upper_pdu->data[0]; 706 // printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", upper_pdu, seq, opcode); 707 // mesh_print_hex("Access Payload", &upper_pdu->data[1], upper_pdu->len - 1); 708 // send 709 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 710 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 711 712 // lend segments to lower transport pdu 713 segmented_pdu->segments = upper_pdu->segments; 714 upper_pdu->segments = NULL; 715 716 // copy meta 717 segmented_pdu->len = upper_pdu->len; 718 segmented_pdu->netkey_index = upper_pdu->netkey_index; 719 segmented_pdu->transmic_len = 0; // no TransMIC for control 720 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 721 segmented_pdu->flags = upper_pdu->flags; 722 723 // setup segmented_pdu header 724 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 725 segmented_pdu->network_header[0] = upper_pdu->ivi_nid; 726 segmented_pdu->network_header[1] = upper_pdu->ctl_ttl; 727 big_endian_store_24(segmented_pdu->network_header, 2, upper_pdu->seq); 728 big_endian_store_16(segmented_pdu->network_header, 5, upper_pdu->src); 729 big_endian_store_16(segmented_pdu->network_header, 7, upper_pdu->dst); 730 731 // queue up 732 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 733 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 734 735 mesh_lower_transport_send_pdu((mesh_pdu_t *) segmented_pdu); 736 } 737 738 static void mesh_upper_transport_run(void){ 739 740 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 741 742 if (crypto_active) return; 743 744 // get next message 745 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(&upper_transport_incoming); 746 mesh_network_pdu_t * network_pdu; 747 mesh_segmented_pdu_t * message_pdu; 748 switch (pdu->pdu_type){ 749 case MESH_PDU_TYPE_UNSEGMENTED: 750 network_pdu = (mesh_network_pdu_t *) pdu; 751 // control? 752 if (mesh_network_control(network_pdu)) { 753 754 incoming_control_pdu = &incoming_pdu_singleton.control; 755 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 756 incoming_control_pdu->len = network_pdu->len; 757 incoming_control_pdu->netkey_index = network_pdu->netkey_index; 758 759 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 760 761 incoming_control_pdu->akf_aid_control = lower_transport_pdu[0]; 762 incoming_control_pdu->len = network_pdu->len - 10; // 9 header + 1 opcode 763 (void)memcpy(incoming_control_pdu->data, &lower_transport_pdu[1], incoming_control_pdu->len); 764 765 // copy meta data into encrypted pdu buffer 766 (void)memcpy(incoming_control_pdu->network_header, network_pdu->data, 9); 767 768 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 769 770 // free mesh message 771 mesh_lower_transport_message_processed_by_higher_layer(pdu); 772 773 btstack_assert(mesh_control_message_handler != NULL); 774 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 775 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 776 777 } else { 778 779 incoming_access_encrypted = (mesh_pdu_t *) network_pdu; 780 781 incoming_access_decrypted = &incoming_pdu_singleton.access; 782 incoming_access_decrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 783 incoming_access_decrypted->netkey_index = network_pdu->netkey_index; 784 incoming_access_decrypted->transmic_len = 4; 785 incoming_access_decrypted->akf_aid_control = network_pdu->data[9]; 786 incoming_access_decrypted->len = network_pdu->len - 10; // 9 header + 1 AID 787 incoming_access_decrypted->ivi_nid = network_pdu->data[0]; 788 incoming_access_decrypted->ctl_ttl = network_pdu->data[1]; 789 incoming_access_decrypted->seq = big_endian_read_24(network_pdu->data, 2); 790 incoming_access_decrypted->src = big_endian_read_16(network_pdu->data, 5); 791 incoming_access_decrypted->dst = big_endian_read_16(network_pdu->data, 7); 792 // (void)memcpy(incoming_access_decrypted->network_header, network_pdu->data, 9); 793 794 mesh_upper_transport_process_access_message(); 795 } 796 break; 797 case MESH_PDU_TYPE_SEGMENTED: 798 message_pdu = (mesh_segmented_pdu_t *) pdu; 799 uint8_t ctl = mesh_message_ctl(message_pdu); 800 if (ctl){ 801 incoming_control_pdu= &incoming_pdu_singleton.control; 802 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 803 804 // flatten 805 mesh_segmented_pdu_flatten(&message_pdu->segments, 8, incoming_control_pdu->data); 806 807 // copy meta data into encrypted pdu buffer 808 incoming_control_pdu->len = message_pdu->len; 809 incoming_access_decrypted->netkey_index = message_pdu->netkey_index; 810 incoming_control_pdu->akf_aid_control = message_pdu->akf_aid_control; 811 incoming_control_pdu->flags = 0; 812 (void)memcpy(incoming_control_pdu->network_header, message_pdu->network_header, 9); 813 814 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 815 816 // free mesh message 817 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 818 819 btstack_assert(mesh_control_message_handler != NULL); 820 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 821 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 822 823 } else { 824 825 incoming_access_encrypted = (mesh_pdu_t *) message_pdu; 826 827 incoming_access_decrypted = &incoming_pdu_singleton.access; 828 incoming_access_decrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 829 incoming_access_decrypted->len = message_pdu->len; 830 incoming_access_decrypted->netkey_index = message_pdu->netkey_index; 831 incoming_access_decrypted->transmic_len = message_pdu->transmic_len; 832 incoming_access_decrypted->akf_aid_control = message_pdu->akf_aid_control; 833 incoming_access_decrypted->ivi_nid = message_pdu->network_header[0]; 834 incoming_access_decrypted->ctl_ttl = message_pdu->network_header[1]; 835 incoming_access_decrypted->seq = big_endian_read_24(message_pdu->network_header, 2); 836 incoming_access_decrypted->src = big_endian_read_16(message_pdu->network_header, 5); 837 incoming_access_decrypted->dst = big_endian_read_16(message_pdu->network_header, 7); 838 // (void)memcpy(incoming_access_decrypted->network_header, message_pdu->network_header, 9); 839 840 mesh_upper_transport_process_access_message(); 841 } 842 break; 843 default: 844 btstack_assert(0); 845 break; 846 } 847 } 848 849 while (!btstack_linked_list_empty(&upper_transport_outgoing)){ 850 851 if (crypto_active) break; 852 853 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_outgoing); 854 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == 0) break; 855 856 mesh_upper_transport_pdu_t * upper_pdu; 857 mesh_segmented_pdu_t * segmented_pdu; 858 bool ok; 859 860 switch (pdu->pdu_type){ 861 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 862 // control pdus can go through directly 863 btstack_assert(mesh_pdu_ctl(pdu) != 0); 864 (void) btstack_linked_list_pop(&upper_transport_outgoing); 865 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 866 break; 867 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 868 // control pdus can go through directly 869 btstack_assert(mesh_pdu_ctl(pdu) != 0); 870 (void) btstack_linked_list_pop(&upper_transport_outgoing); 871 mesh_upper_transport_send_segmented_control_pdu((mesh_upper_transport_pdu_t *) pdu); 872 break; 873 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 874 // segmented access pdus required a mesh-segmented-pdu 875 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 876 if (upper_pdu->lower_pdu == NULL){ 877 segmented_pdu = btstack_memory_mesh_segmented_pdu_get(); 878 } 879 if (segmented_pdu == NULL) break; 880 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 881 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 882 // and a mesh-network-pdu for each segment in upper pdu 883 ok = mesh_segmented_allocate_segments(&segmented_pdu->segments, upper_pdu->len + upper_pdu->transmic_len); 884 if (!ok) break; 885 // all buffers available, get started 886 (void) btstack_linked_list_pop(&upper_transport_outgoing); 887 mesh_upper_transport_send_access(upper_pdu); 888 break; 889 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 890 // unsegmented access pdus require a single mesh-network-dpu 891 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 892 if (upper_pdu->lower_pdu == NULL){ 893 upper_pdu->lower_pdu = (mesh_pdu_t *) mesh_network_pdu_get(); 894 } 895 if (upper_pdu->lower_pdu == NULL) break; 896 (void) btstack_linked_list_pop(&upper_transport_outgoing); 897 mesh_upper_transport_send_access((mesh_upper_transport_pdu_t *) pdu); 898 break; 899 default: 900 btstack_assert(false); 901 break; 902 } 903 } 904 } 905 906 static mesh_upper_transport_pdu_t * mesh_upper_transport_find_pdu_for_lower(mesh_pdu_t * pdu_to_find){ 907 btstack_linked_list_iterator_t it; 908 btstack_linked_list_iterator_init(&it, &upper_transport_outgoing_active); 909 mesh_upper_transport_pdu_t * upper_pdu; 910 while (btstack_linked_list_iterator_has_next(&it)){ 911 mesh_pdu_t * mesh_pdu = (mesh_pdu_t *) btstack_linked_list_iterator_next(&it); 912 switch (mesh_pdu->pdu_type){ 913 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 914 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 915 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 916 upper_pdu = (mesh_upper_transport_pdu_t *) mesh_pdu; 917 if (upper_pdu->lower_pdu == pdu_to_find){ 918 btstack_linked_list_iterator_remove(&it); 919 return upper_pdu; 920 } 921 break; 922 default: 923 break; 924 } 925 } 926 return NULL; 927 } 928 929 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 930 mesh_upper_transport_pdu_t * upper_pdu; 931 mesh_network_pdu_t * network_pdu; 932 mesh_segmented_pdu_t * segmented_pdu; 933 switch (callback_type){ 934 case MESH_TRANSPORT_PDU_RECEIVED: 935 mesh_upper_transport_message_received(pdu); 936 break; 937 case MESH_TRANSPORT_PDU_SENT: 938 switch (pdu->pdu_type){ 939 case MESH_PDU_TYPE_SEGMENTED: 940 // try to find in outgoing active 941 upper_pdu = mesh_upper_transport_find_pdu_for_lower(pdu); 942 btstack_assert(upper_pdu != NULL); 943 segmented_pdu = (mesh_segmented_pdu_t *) pdu; 944 // free chunks 945 while (!btstack_linked_list_empty(&segmented_pdu->segments)){ 946 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&segmented_pdu->segments); 947 mesh_network_pdu_free(network_pdu); 948 } 949 // free segmented pdu 950 btstack_memory_mesh_segmented_pdu_free(segmented_pdu); 951 // TODO: free segmented_pdu 952 upper_pdu->lower_pdu = NULL; 953 switch (upper_pdu->pdu_header.pdu_type){ 954 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 955 mesh_control_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 956 break; 957 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 958 mesh_access_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 959 break; 960 default: 961 btstack_assert(false); 962 break; 963 } 964 break; 965 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 966 // find corresponding upper transport pdu and free single segment 967 upper_pdu = mesh_upper_transport_find_pdu_for_lower(pdu); 968 btstack_assert(upper_pdu != NULL); 969 btstack_assert(upper_pdu->lower_pdu == (mesh_pdu_t *) pdu); 970 mesh_network_pdu_free((mesh_network_pdu_t *) pdu); 971 upper_pdu->lower_pdu = NULL; 972 mesh_access_message_handler(callback_type, status, (mesh_pdu_t*) upper_pdu); 973 break; 974 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 975 mesh_access_message_handler(callback_type, status, pdu); 976 break; 977 default: 978 btstack_assert(false); 979 break; 980 } 981 mesh_upper_transport_run(); 982 break; 983 default: 984 break; 985 } 986 } 987 988 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 989 mesh_network_pdu_t * network_pdu; 990 mesh_segmented_pdu_t * message_pdu; 991 switch (pdu->pdu_type) { 992 case MESH_PDU_TYPE_NETWORK: 993 network_pdu = (mesh_network_pdu_t *) pdu; 994 mesh_network_pdu_free(network_pdu); 995 break; 996 case MESH_PDU_TYPE_SEGMENTED: 997 message_pdu = (mesh_segmented_pdu_t *) pdu; 998 mesh_message_pdu_free(message_pdu); 999 default: 1000 btstack_assert(false); 1001 break; 1002 } 1003 } 1004 1005 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 1006 crypto_active = 0; 1007 switch (pdu->pdu_type){ 1008 case MESH_PDU_TYPE_ACCESS: 1009 mesh_upper_transport_process_access_message_done((mesh_access_pdu_t *) pdu); 1010 case MESH_PDU_TYPE_CONTROL: 1011 mesh_upper_transport_process_control_message_done((mesh_control_pdu_t *) pdu); 1012 break; 1013 default: 1014 btstack_assert(0); 1015 break; 1016 } 1017 } 1018 1019 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 1020 switch (pdu->pdu_type){ 1021 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1022 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1023 break; 1024 default: 1025 btstack_assert(false); 1026 break; 1027 } 1028 1029 btstack_assert(((mesh_upper_transport_pdu_t *) pdu)->lower_pdu == NULL); 1030 1031 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1032 mesh_upper_transport_run(); 1033 } 1034 1035 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 1036 switch (pdu->pdu_type){ 1037 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1038 break; 1039 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1040 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 1041 break; 1042 default: 1043 btstack_assert(false); 1044 break; 1045 } 1046 1047 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1048 mesh_upper_transport_run(); 1049 } 1050 1051 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, 1052 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1053 1054 if (control_pdu_len > 11) return 1; 1055 1056 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1057 if (!network_key) return 1; 1058 1059 uint8_t transport_pdu_data[12]; 1060 transport_pdu_data[0] = opcode; 1061 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 1062 uint16_t transport_pdu_len = control_pdu_len + 1; 1063 1064 // setup network_pdu 1065 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 1066 1067 return 0; 1068 } 1069 1070 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, 1071 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1072 1073 if (control_pdu_len > 256) return 1; 1074 1075 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1076 if (!network_key) return 1; 1077 1078 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1079 upper_pdu->ctl_ttl = ttl; 1080 upper_pdu->src = src; 1081 upper_pdu->dst = dest; 1082 upper_pdu->transmic_len = 0; // no TransMIC for control 1083 upper_pdu->netkey_index = netkey_index; 1084 upper_pdu->akf_aid_control = opcode; 1085 1086 // allocate segments 1087 btstack_linked_list_t free_segments = NULL; 1088 bool ok = mesh_segmented_allocate_segments( &free_segments, control_pdu_len); 1089 if (!ok) return 1; 1090 // store control pdu 1091 mesh_segmented_store_payload(control_pdu_data, control_pdu_len, &free_segments, &upper_pdu->segments); 1092 upper_pdu->len = control_pdu_len; 1093 return 0; 1094 } 1095 1096 uint8_t mesh_upper_transport_setup_control_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, 1097 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1098 switch (pdu->pdu_type){ 1099 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1100 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); 1101 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1102 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); 1103 default: 1104 btstack_assert(0); 1105 return 1; 1106 } 1107 } 1108 1109 static uint8_t mesh_upper_transport_setup_segmented_access_pdu_header(mesh_access_pdu_t * access_pdu, uint16_t netkey_index, 1110 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1111 1112 // get app or device key 1113 const mesh_transport_key_t *appkey; 1114 appkey = mesh_transport_key_get(appkey_index); 1115 if (appkey == NULL) { 1116 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 1117 return 1; 1118 } 1119 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1120 1121 // lookup network by netkey_index 1122 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 1123 if (!network_key) return 1; 1124 if (network_key == NULL) { 1125 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 1126 return 1; 1127 } 1128 1129 const uint8_t trans_mic_len = szmic ? 8 : 4; 1130 1131 // store in transport pdu 1132 access_pdu->transmic_len = trans_mic_len; 1133 access_pdu->netkey_index = netkey_index; 1134 access_pdu->appkey_index = appkey_index; 1135 access_pdu->akf_aid_control = akf_aid; 1136 mesh_access_set_ivi_nid(access_pdu, network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7)); 1137 mesh_access_set_src(access_pdu, src); 1138 mesh_access_set_dest(access_pdu, dest); 1139 mesh_access_set_ctl_ttl(access_pdu, ttl); 1140 return 0; 1141 } 1142 1143 static uint8_t mesh_upper_transport_setup_upper_access_pdu_header(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, 1144 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1145 1146 // get app or device key 1147 const mesh_transport_key_t *appkey; 1148 appkey = mesh_transport_key_get(appkey_index); 1149 if (appkey == NULL) { 1150 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 1151 return 1; 1152 } 1153 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1154 1155 // lookup network by netkey_index 1156 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 1157 if (!network_key) return 1; 1158 if (network_key == NULL) { 1159 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 1160 return 1; 1161 } 1162 1163 const uint8_t trans_mic_len = szmic ? 8 : 4; 1164 1165 // store in transport pdu 1166 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1167 upper_pdu->ctl_ttl = ttl; 1168 upper_pdu->src = src; 1169 upper_pdu->dst = dest; 1170 upper_pdu->transmic_len = trans_mic_len; 1171 upper_pdu->netkey_index = netkey_index; 1172 upper_pdu->appkey_index = appkey_index; 1173 upper_pdu->akf_aid_control = akf_aid; 1174 return 0; 1175 } 1176 1177 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, 1178 uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 1179 int status = mesh_upper_transport_setup_upper_access_pdu_header(upper_pdu, netkey_index, appkey_index, ttl, src, 1180 dest, szmic); 1181 if (status) return status; 1182 1183 // allocate segments 1184 btstack_linked_list_t free_segments = NULL; 1185 bool ok = mesh_segmented_allocate_segments( &free_segments, access_pdu_len); 1186 if (!ok) return 1; 1187 // store control pdu 1188 mesh_segmented_store_payload(access_pdu_data, access_pdu_len, &free_segments, &upper_pdu->segments); 1189 upper_pdu->len = access_pdu_len; 1190 return 0; 1191 } 1192 1193 1194 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 1195 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1196 switch (pdu->pdu_type){ 1197 case MESH_PDU_TYPE_ACCESS: 1198 return mesh_upper_transport_setup_segmented_access_pdu_header((mesh_access_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 1199 default: 1200 btstack_assert(false); 1201 return 1; 1202 } 1203 } 1204 1205 uint8_t mesh_upper_transport_setup_access_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 1206 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic, 1207 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 1208 switch (pdu->pdu_type){ 1209 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1210 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1211 return mesh_upper_transport_setup_upper_access_pdu((mesh_upper_transport_pdu_t *) pdu, netkey_index, 1212 appkey_index, ttl, src, dest, szmic, access_pdu_data, 1213 access_pdu_len); 1214 default: 1215 btstack_assert(false); 1216 return 1; 1217 } 1218 } 1219 1220 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)) { 1221 mesh_access_message_handler = callback; 1222 } 1223 1224 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)){ 1225 mesh_control_message_handler = callback; 1226 } 1227 1228 void mesh_upper_transport_init(){ 1229 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1230 } 1231