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_segmented_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 87 static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; 88 89 static mesh_access_pdu_t * incoming_access_pdu_encrypted; 90 static mesh_access_pdu_t * incoming_access_pdu_decrypted; 91 92 static mesh_control_pdu_t * incoming_control_pdu; 93 94 static mesh_access_pdu_t incoming_access_pdu_encrypted_singleton; 95 96 static mesh_pdu_t * incoming_access_encrypted; 97 98 static union { 99 mesh_control_pdu_t control; 100 mesh_access_pdu_t access; 101 } incoming_pdu_singleton; 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 big_endian_read_16(access_pdu->network_header, 7); 172 } 173 174 uint16_t mesh_access_ctl(mesh_access_pdu_t * access_pdu){ 175 return access_pdu->network_header[1] >> 7; 176 } 177 178 uint32_t mesh_access_seq(mesh_access_pdu_t * access_pdu){ 179 return big_endian_read_24(access_pdu->network_header, 2); 180 } 181 182 void mesh_access_set_nid_ivi(mesh_access_pdu_t * access_pdu, uint8_t nid_ivi){ 183 access_pdu->network_header[0] = nid_ivi; 184 } 185 void mesh_access_set_ctl_ttl(mesh_access_pdu_t * access_pdu, uint8_t ctl_ttl){ 186 access_pdu->network_header[1] = ctl_ttl; 187 } 188 void mesh_access_set_seq(mesh_access_pdu_t * access_pdu, uint32_t seq){ 189 big_endian_store_24(access_pdu->network_header, 2, seq); 190 } 191 void mesh_access_set_src(mesh_access_pdu_t * access_pdu, uint16_t src){ 192 big_endian_store_16(access_pdu->network_header, 5, src); 193 } 194 void mesh_access_set_dest(mesh_access_pdu_t * access_pdu, uint16_t dest){ 195 big_endian_store_16(access_pdu->network_header, 7, dest); 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 (void)memcpy(&nonce[2], &access_pdu->network_header[2], 7); 344 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(access_pdu->network_header[0])); 345 break; 346 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 347 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 348 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 349 nonce[1] = upper_pdu->transmic_len == 8 ? 0x80 : 0x00; 350 // 'network header' 351 big_endian_store_24(nonce, 2, upper_pdu->seq); 352 big_endian_store_16(nonce, 5, upper_pdu->src); 353 big_endian_store_16(nonce, 7, upper_pdu->dst); 354 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(upper_pdu->ivi_nid)); 355 break; 356 default: 357 btstack_assert(0); 358 break; 359 } 360 } 361 362 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 363 nonce[0] = 0x01; 364 transport_segmented_setup_nonce(nonce, pdu); 365 mesh_print_hex("AppNonce", nonce, 13); 366 } 367 368 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 369 nonce[0] = 0x02; 370 transport_segmented_setup_nonce(nonce, pdu); 371 mesh_print_hex("DeviceNonce", nonce, 13); 372 } 373 374 static void mesh_upper_transport_process_access_message_done(mesh_access_pdu_t *access_pdu){ 375 crypto_active = 0; 376 btstack_assert(mesh_access_ctl(access_pdu) == 0); 377 mesh_lower_transport_message_processed_by_higher_layer(incoming_access_encrypted); 378 incoming_access_encrypted = NULL; 379 incoming_access_pdu_encrypted = NULL; 380 mesh_upper_transport_run(); 381 } 382 383 static void mesh_upper_transport_process_control_message_done(mesh_control_pdu_t * control_pdu){ 384 crypto_active = 0; 385 incoming_control_pdu = NULL; 386 mesh_upper_transport_run(); 387 } 388 389 static void mesh_upper_transport_validate_segmented_message_ccm(void * arg){ 390 UNUSED(arg); 391 392 uint8_t * upper_transport_pdu = incoming_access_pdu_decrypted->data; 393 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 394 395 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 396 397 // store TransMIC 398 uint8_t trans_mic[8]; 399 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 400 mesh_print_hex("TransMIC", trans_mic, incoming_access_pdu_decrypted->transmic_len); 401 402 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], incoming_access_pdu_decrypted->transmic_len) == 0){ 403 printf("TransMIC matches\n"); 404 405 // remove TransMIC from payload 406 incoming_access_pdu_decrypted->len -= incoming_access_pdu_decrypted->transmic_len; 407 408 // if virtual address, update dst to pseudo_dst 409 if (mesh_network_address_virtual(mesh_access_dst(incoming_access_pdu_decrypted))){ 410 big_endian_store_16(incoming_access_pdu_decrypted->network_header, 7, mesh_transport_key_it.address->pseudo_dst); 411 } 412 413 // pass to upper layer 414 btstack_assert(mesh_access_message_handler != NULL); 415 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_access_pdu_decrypted; 416 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 417 418 printf("\n"); 419 420 } else { 421 uint8_t akf = incoming_access_pdu_decrypted->akf_aid_control & 0x40; 422 if (akf){ 423 printf("TransMIC does not match, try next key\n"); 424 mesh_upper_transport_validate_segmented_message(); 425 } else { 426 printf("TransMIC does not match device key, done\n"); 427 // done 428 mesh_upper_transport_process_access_message_done(incoming_access_pdu_decrypted); 429 } 430 } 431 } 432 433 static void mesh_upper_transport_validate_segmented_message_digest(void * arg){ 434 UNUSED(arg); 435 uint8_t upper_transport_pdu_len = incoming_access_pdu_encrypted->len - incoming_access_pdu_encrypted->transmic_len; 436 uint8_t * upper_transport_pdu_data_in = incoming_access_pdu_encrypted->data; 437 uint8_t * upper_transport_pdu_data_out = incoming_access_pdu_decrypted->data; 438 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); 439 } 440 441 static void mesh_upper_transport_validate_segmented_message(void){ 442 uint8_t * upper_transport_pdu_data = incoming_access_pdu_decrypted->data; 443 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 444 445 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 446 printf("No valid transport key found\n"); 447 mesh_upper_transport_process_access_message_done(incoming_access_pdu_decrypted); 448 return; 449 } 450 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 451 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 452 453 if (message_key->akf){ 454 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) incoming_access_pdu_encrypted); 455 } else { 456 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) incoming_access_pdu_encrypted); 457 } 458 459 // store application / device key index 460 mesh_print_hex("AppOrDevKey", message_key->key, 16); 461 incoming_access_pdu_decrypted->appkey_index = message_key->appkey_index; 462 463 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 464 465 // decrypt ccm 466 crypto_active = 1; 467 uint16_t aad_len = 0; 468 if (mesh_network_address_virtual(mesh_access_dst(incoming_access_pdu_decrypted))){ 469 aad_len = 16; 470 } 471 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, incoming_access_pdu_decrypted->transmic_len); 472 473 if (aad_len){ 474 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_segmented_message_digest, NULL); 475 } else { 476 mesh_upper_transport_validate_segmented_message_digest(NULL); 477 } 478 } 479 480 static void mesh_upper_transport_process_segmented_message(void){ 481 // copy original pdu 482 (void)memcpy(incoming_access_pdu_decrypted, incoming_access_pdu_encrypted, 483 sizeof(mesh_access_pdu_t)); 484 485 // 486 uint8_t * upper_transport_pdu = incoming_access_pdu_decrypted->data; 487 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 488 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 489 490 uint8_t aid = incoming_access_pdu_decrypted->akf_aid_control & 0x3f; 491 uint8_t akf = (incoming_access_pdu_decrypted->akf_aid_control & 0x40) >> 6; 492 493 printf("AKF: %u\n", akf); 494 printf("AID: %02x\n", aid); 495 496 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_access_dst(incoming_access_pdu_decrypted), 497 incoming_access_pdu_decrypted->netkey_index, akf, aid); 498 mesh_upper_transport_validate_segmented_message(); 499 } 500 501 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 502 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 503 mesh_upper_transport_run(); 504 } 505 506 static void mesh_upper_transport_send_access_segmented(mesh_upper_transport_pdu_t * upper_pdu){ 507 508 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 509 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 510 511 // convert mesh_access_pdu_t into mesh_segmented_pdu_t 512 btstack_linked_list_t free_segments = segmented_pdu->segments; 513 segmented_pdu->segments = NULL; 514 mesh_segmented_store_payload(incoming_pdu_singleton.access.data, upper_pdu->len, &free_segments, &segmented_pdu->segments); 515 516 // copy meta 517 segmented_pdu->len = upper_pdu->len; 518 segmented_pdu->netkey_index = upper_pdu->netkey_index; 519 segmented_pdu->transmic_len = upper_pdu->transmic_len; 520 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 521 segmented_pdu->flags = upper_pdu->flags; 522 523 // setup segmented_pdu header 524 // (void)memcpy(segmented_pdu->network_header, upper_pdu->network_header, 9); 525 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 526 segmented_pdu->network_header[0] = upper_pdu->ivi_nid; 527 segmented_pdu->network_header[1] = upper_pdu->ctl_ttl; 528 big_endian_store_24(segmented_pdu->network_header, 2, upper_pdu->seq); 529 big_endian_store_16(segmented_pdu->network_header, 5, upper_pdu->src); 530 big_endian_store_16(segmented_pdu->network_header, 7, upper_pdu->dst); 531 532 // queue up 533 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 534 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 535 536 mesh_lower_transport_send_pdu((mesh_pdu_t*) segmented_pdu); 537 } 538 539 static void mesh_upper_transport_send_access_unsegmented(mesh_upper_transport_pdu_t * upper_pdu){ 540 541 // provide segment 542 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) upper_pdu->lower_pdu; 543 544 // setup network pdu 545 network_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS; 546 network_pdu->data[0] = upper_pdu->ivi_nid; 547 network_pdu->data[1] = upper_pdu->ctl_ttl; 548 big_endian_store_24(network_pdu->data, 2, upper_pdu->seq); 549 big_endian_store_16(network_pdu->data, 5, upper_pdu->src); 550 big_endian_store_16(network_pdu->data, 7, upper_pdu->dst); 551 network_pdu->netkey_index = upper_pdu->netkey_index; 552 553 // setup access message 554 network_pdu->data[9] = upper_pdu->akf_aid_control; 555 btstack_assert(upper_pdu->len < 15); 556 (void)memcpy(&network_pdu->data[10], &incoming_pdu_singleton.access.data, upper_pdu->len); 557 network_pdu->len = 10 + upper_pdu->len; 558 network_pdu->flags = 0; 559 560 // queue up 561 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 562 563 mesh_lower_transport_send_pdu((mesh_pdu_t*) network_pdu); 564 } 565 566 static void mesh_upper_transport_send_access_ccm(void * arg){ 567 crypto_active = 0; 568 569 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 570 mesh_print_hex("EncAccessPayload", incoming_pdu_singleton.access.data, upper_pdu->len); 571 // store TransMIC 572 btstack_crypto_ccm_get_authentication_value(&ccm, &incoming_pdu_singleton.access.data[upper_pdu->len]); 573 mesh_print_hex("TransMIC", &incoming_pdu_singleton.access.data[upper_pdu->len], upper_pdu->transmic_len); 574 upper_pdu->len += upper_pdu->transmic_len; 575 mesh_print_hex("UpperTransportPDU", incoming_pdu_singleton.access.data, upper_pdu->len); 576 switch (upper_pdu->pdu_header.pdu_type){ 577 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 578 mesh_upper_transport_send_access_unsegmented(upper_pdu); 579 break; 580 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 581 mesh_upper_transport_send_access_segmented(upper_pdu); 582 break; 583 default: 584 btstack_assert(false); 585 } 586 } 587 588 static void mesh_upper_transport_send_access_digest(void *arg){ 589 mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; 590 uint16_t access_pdu_len = upper_pdu->len; 591 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, incoming_pdu_singleton.access.data, incoming_pdu_singleton.access.data, 592 &mesh_upper_transport_send_access_ccm, upper_pdu); 593 } 594 595 static void mesh_upper_transport_send_access(mesh_upper_transport_pdu_t * upper_pdu){ 596 597 // if dst is virtual address, lookup label uuid and hash 598 uint16_t aad_len = 0; 599 mesh_virtual_address_t * virtual_address = NULL; 600 if (mesh_network_address_virtual(upper_pdu->dst)){ 601 virtual_address = mesh_virtual_address_for_pseudo_dst(upper_pdu->dst); 602 if (!virtual_address){ 603 printf("No virtual address register for pseudo dst %4x\n", upper_pdu->dst); 604 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 605 return; 606 } 607 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 608 // printf_hexdump(virtual_address->label_uuid, 16); 609 aad_len = 16; 610 upper_pdu->dst = virtual_address->hash; 611 } 612 613 // get app or device key 614 uint16_t appkey_index = upper_pdu->appkey_index; 615 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(upper_pdu->netkey_index, appkey_index); 616 if (appkey == NULL){ 617 printf("AppKey %04x not found, drop message\n", appkey_index); 618 mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); 619 return; 620 } 621 622 // reserve slot 623 mesh_lower_transport_reserve_slot(); 624 625 // reserve one sequence number, which is also used to encrypt access payload 626 uint32_t seq = mesh_sequence_number_next(); 627 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 628 upper_pdu->seq = seq; 629 630 // also reserves crypto_buffer 631 crypto_active = 1; 632 633 // flatten segmented pdu into crypto buffer 634 uint16_t payload_len = mesh_upper_pdu_flatten(upper_pdu, incoming_pdu_singleton.access.data, sizeof(incoming_pdu_singleton.access.data)); 635 btstack_assert(payload_len == upper_pdu->len); 636 637 // Dump PDU 638 printf("[+] Upper transport, send upper (un)segmented Access PDU - dest %04x, seq %06x\n", upper_pdu->dst, upper_pdu->seq); 639 mesh_print_hex("Access Payload", incoming_pdu_singleton.access.data, upper_pdu->len); 640 641 // setup nonce - uses dst, so after pseudo address translation 642 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 643 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 644 } else { 645 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); 646 } 647 648 // Dump key 649 mesh_print_hex("AppOrDevKey", appkey->key, 16); 650 651 // encrypt ccm 652 uint8_t transmic_len = upper_pdu->transmic_len; 653 uint16_t access_pdu_len = upper_pdu->len; 654 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 655 if (virtual_address){ 656 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 657 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, 658 &mesh_upper_transport_send_access_digest, upper_pdu); 659 } else { 660 mesh_upper_transport_send_access_digest(upper_pdu); 661 } 662 } 663 664 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 665 // reserve slot 666 mesh_lower_transport_reserve_slot(); 667 // reserve sequence number 668 uint32_t seq = mesh_sequence_number_next(); 669 mesh_network_pdu_set_seq(network_pdu, seq); 670 // Dump PDU 671 uint8_t opcode = network_pdu->data[9]; 672 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 673 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 674 675 // send 676 mesh_lower_transport_send_pdu((mesh_pdu_t *) network_pdu); 677 } 678 679 static void mesh_upper_transport_send_segmented_control_pdu(mesh_upper_transport_pdu_t * upper_pdu){ 680 // reserve slot 681 mesh_lower_transport_reserve_slot(); 682 // reserve sequence number 683 uint32_t seq = mesh_sequence_number_next(); 684 upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 685 upper_pdu->seq = seq; 686 // Dump PDU 687 // uint8_t opcode = upper_pdu->data[0]; 688 // printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", upper_pdu, seq, opcode); 689 // mesh_print_hex("Access Payload", &upper_pdu->data[1], upper_pdu->len - 1); 690 // send 691 mesh_segmented_pdu_t * segmented_pdu = (mesh_segmented_pdu_t *) upper_pdu->lower_pdu; 692 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 693 694 // lend segments to lower transport pdu 695 segmented_pdu->segments = upper_pdu->segments; 696 upper_pdu->segments = NULL; 697 698 // copy meta 699 segmented_pdu->len = upper_pdu->len; 700 segmented_pdu->netkey_index = upper_pdu->netkey_index; 701 segmented_pdu->transmic_len = 0; // no TransMIC for control 702 segmented_pdu->akf_aid_control = upper_pdu->akf_aid_control; 703 segmented_pdu->flags = upper_pdu->flags; 704 705 // setup segmented_pdu header 706 // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport 707 segmented_pdu->network_header[0] = upper_pdu->ivi_nid; 708 segmented_pdu->network_header[1] = upper_pdu->ctl_ttl; 709 big_endian_store_24(segmented_pdu->network_header, 2, upper_pdu->seq); 710 big_endian_store_16(segmented_pdu->network_header, 5, upper_pdu->src); 711 big_endian_store_16(segmented_pdu->network_header, 7, upper_pdu->dst); 712 713 // queue up 714 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 715 btstack_linked_list_add(&upper_transport_outgoing_active, (btstack_linked_item_t *) upper_pdu); 716 717 mesh_lower_transport_send_pdu((mesh_pdu_t *) segmented_pdu); 718 } 719 720 static void mesh_upper_transport_run(void){ 721 722 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 723 724 if (crypto_active) return; 725 726 // get next message 727 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(&upper_transport_incoming); 728 mesh_network_pdu_t * network_pdu; 729 mesh_segmented_pdu_t * message_pdu; 730 switch (pdu->pdu_type){ 731 case MESH_PDU_TYPE_UNSEGMENTED: 732 network_pdu = (mesh_network_pdu_t *) pdu; 733 // control? 734 if (mesh_network_control(network_pdu)) { 735 736 incoming_control_pdu = &incoming_pdu_singleton.control; 737 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 738 incoming_control_pdu->len = network_pdu->len; 739 incoming_control_pdu->netkey_index = network_pdu->netkey_index; 740 741 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 742 743 incoming_control_pdu->akf_aid_control = lower_transport_pdu[0]; 744 incoming_control_pdu->len = network_pdu->len - 10; // 9 header + 1 opcode 745 (void)memcpy(incoming_control_pdu->data, &lower_transport_pdu[1], incoming_control_pdu->len); 746 747 // copy meta data into encrypted pdu buffer 748 (void)memcpy(incoming_control_pdu->network_header, network_pdu->data, 9); 749 750 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 751 752 // free mesh message 753 mesh_lower_transport_message_processed_by_higher_layer(pdu); 754 755 btstack_assert(mesh_control_message_handler != NULL); 756 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 757 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 758 759 } else { 760 761 incoming_access_encrypted = (mesh_pdu_t *) network_pdu; 762 763 incoming_access_pdu_encrypted = &incoming_access_pdu_encrypted_singleton; 764 incoming_access_pdu_encrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 765 incoming_access_pdu_decrypted = &incoming_pdu_singleton.access; 766 767 incoming_access_pdu_encrypted->netkey_index = network_pdu->netkey_index; 768 incoming_access_pdu_encrypted->transmic_len = 4; 769 770 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 771 772 incoming_access_pdu_encrypted->akf_aid_control = lower_transport_pdu[0]; 773 incoming_access_pdu_encrypted->len = network_pdu->len - 10; // 9 header + 1 AID 774 (void)memcpy(incoming_access_pdu_encrypted->data, &lower_transport_pdu[1], incoming_access_pdu_encrypted->len); 775 776 // copy meta data into encrypted pdu buffer 777 (void)memcpy(incoming_access_pdu_encrypted->network_header, network_pdu->data, 9); 778 779 mesh_print_hex("Assembled payload", incoming_access_pdu_encrypted->data, incoming_access_pdu_encrypted->len); 780 781 // get encoded transport pdu and start processing 782 mesh_upper_transport_process_segmented_message(); 783 } 784 break; 785 case MESH_PDU_TYPE_SEGMENTED: 786 message_pdu = (mesh_segmented_pdu_t *) pdu; 787 uint8_t ctl = mesh_message_ctl(message_pdu); 788 if (ctl){ 789 incoming_control_pdu= &incoming_pdu_singleton.control; 790 incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; 791 792 // flatten 793 mesh_segmented_pdu_flatten(&message_pdu->segments, 8, incoming_control_pdu->data); 794 795 // copy meta data into encrypted pdu buffer 796 incoming_control_pdu->len = message_pdu->len; 797 incoming_control_pdu->netkey_index = message_pdu->netkey_index; 798 incoming_control_pdu->akf_aid_control = message_pdu->akf_aid_control; 799 incoming_control_pdu->flags = 0; 800 (void)memcpy(incoming_control_pdu->network_header, message_pdu->network_header, 9); 801 802 mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); 803 804 // free mesh message 805 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 806 807 btstack_assert(mesh_control_message_handler != NULL); 808 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; 809 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 810 811 } else { 812 813 incoming_access_encrypted = (mesh_pdu_t *) message_pdu; 814 815 incoming_access_pdu_encrypted = &incoming_access_pdu_encrypted_singleton; 816 incoming_access_pdu_encrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 817 incoming_access_pdu_decrypted = &incoming_pdu_singleton.access; 818 819 // flatten 820 mesh_segmented_pdu_flatten(&message_pdu->segments, 12, incoming_access_pdu_encrypted->data); 821 822 // copy meta data into encrypted pdu buffer 823 incoming_access_pdu_encrypted->len = message_pdu->len; 824 incoming_access_pdu_encrypted->netkey_index = message_pdu->netkey_index; 825 incoming_access_pdu_encrypted->transmic_len = message_pdu->transmic_len; 826 incoming_access_pdu_encrypted->akf_aid_control = message_pdu->akf_aid_control; 827 (void)memcpy(incoming_access_pdu_encrypted->network_header, message_pdu->network_header, 9); 828 829 mesh_print_hex("Assembled payload", incoming_access_pdu_encrypted->data, incoming_access_pdu_encrypted->len); 830 831 // get encoded transport pdu and start processing 832 mesh_upper_transport_process_segmented_message(); 833 } 834 break; 835 default: 836 btstack_assert(0); 837 break; 838 } 839 } 840 841 while (!btstack_linked_list_empty(&upper_transport_outgoing)){ 842 843 if (crypto_active) break; 844 845 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_outgoing); 846 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == 0) break; 847 848 mesh_upper_transport_pdu_t * upper_pdu; 849 mesh_segmented_pdu_t * segmented_pdu; 850 bool ok; 851 852 switch (pdu->pdu_type){ 853 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 854 // control pdus can go through directly 855 btstack_assert(mesh_pdu_ctl(pdu) != 0); 856 (void) btstack_linked_list_pop(&upper_transport_outgoing); 857 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 858 break; 859 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 860 // control pdus can go through directly 861 btstack_assert(mesh_pdu_ctl(pdu) != 0); 862 (void) btstack_linked_list_pop(&upper_transport_outgoing); 863 mesh_upper_transport_send_segmented_control_pdu((mesh_upper_transport_pdu_t *) pdu); 864 break; 865 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 866 // segmented access pdus required a mesh-segmented-pdu 867 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 868 if (upper_pdu->lower_pdu == NULL){ 869 segmented_pdu = btstack_memory_mesh_segmented_pdu_get(); 870 } 871 if (segmented_pdu == NULL) break; 872 upper_pdu->lower_pdu = (mesh_pdu_t *) segmented_pdu; 873 segmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 874 // and a mesh-network-pdu for each segment in upper pdu 875 ok = mesh_segmented_allocate_segments(&segmented_pdu->segments, upper_pdu->len + upper_pdu->transmic_len); 876 if (!ok) break; 877 // all buffers available, get started 878 (void) btstack_linked_list_pop(&upper_transport_outgoing); 879 mesh_upper_transport_send_access(upper_pdu); 880 break; 881 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 882 // unsegmented access pdus require a single mesh-network-dpu 883 upper_pdu = (mesh_upper_transport_pdu_t *) pdu; 884 if (upper_pdu->lower_pdu == NULL){ 885 upper_pdu->lower_pdu = (mesh_pdu_t *) mesh_network_pdu_get(); 886 } 887 if (upper_pdu->lower_pdu == NULL) break; 888 (void) btstack_linked_list_pop(&upper_transport_outgoing); 889 mesh_upper_transport_send_access((mesh_upper_transport_pdu_t *) pdu); 890 break; 891 default: 892 btstack_assert(false); 893 break; 894 } 895 } 896 } 897 898 static mesh_upper_transport_pdu_t * mesh_upper_transport_find_pdu_for_lower(mesh_pdu_t * pdu_to_find){ 899 btstack_linked_list_iterator_t it; 900 btstack_linked_list_iterator_init(&it, &upper_transport_outgoing_active); 901 mesh_upper_transport_pdu_t * upper_pdu; 902 while (btstack_linked_list_iterator_has_next(&it)){ 903 mesh_pdu_t * mesh_pdu = (mesh_pdu_t *) btstack_linked_list_iterator_next(&it); 904 switch (mesh_pdu->pdu_type){ 905 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 906 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 907 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 908 upper_pdu = (mesh_upper_transport_pdu_t *) mesh_pdu; 909 if (upper_pdu->lower_pdu == pdu_to_find){ 910 btstack_linked_list_iterator_remove(&it); 911 return upper_pdu; 912 } 913 break; 914 default: 915 break; 916 } 917 } 918 return NULL; 919 } 920 921 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 922 mesh_upper_transport_pdu_t * upper_pdu; 923 mesh_network_pdu_t * network_pdu; 924 mesh_segmented_pdu_t * segmented_pdu; 925 switch (callback_type){ 926 case MESH_TRANSPORT_PDU_RECEIVED: 927 mesh_upper_transport_message_received(pdu); 928 break; 929 case MESH_TRANSPORT_PDU_SENT: 930 switch (pdu->pdu_type){ 931 case MESH_PDU_TYPE_SEGMENTED: 932 // try to find in outgoing active 933 upper_pdu = mesh_upper_transport_find_pdu_for_lower(pdu); 934 btstack_assert(upper_pdu != NULL); 935 segmented_pdu = (mesh_segmented_pdu_t *) pdu; 936 // free chunks 937 while (!btstack_linked_list_empty(&segmented_pdu->segments)){ 938 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&segmented_pdu->segments); 939 mesh_network_pdu_free(network_pdu); 940 } 941 // free segmented pdu 942 btstack_memory_mesh_segmented_pdu_free(segmented_pdu); 943 // TODO: free segmented_pdu 944 upper_pdu->lower_pdu = NULL; 945 switch (upper_pdu->pdu_header.pdu_type){ 946 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 947 mesh_control_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 948 break; 949 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 950 mesh_access_message_handler(callback_type, status, (mesh_pdu_t *) upper_pdu); 951 break; 952 default: 953 btstack_assert(false); 954 break; 955 } 956 break; 957 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 958 // find corresponding upper transport pdu and free single segment 959 upper_pdu = mesh_upper_transport_find_pdu_for_lower(pdu); 960 btstack_assert(upper_pdu != NULL); 961 btstack_assert(upper_pdu->lower_pdu == (mesh_pdu_t *) pdu); 962 mesh_network_pdu_free((mesh_network_pdu_t *) pdu); 963 upper_pdu->lower_pdu = NULL; 964 mesh_access_message_handler(callback_type, status, (mesh_pdu_t*) upper_pdu); 965 break; 966 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 967 mesh_access_message_handler(callback_type, status, pdu); 968 break; 969 default: 970 btstack_assert(false); 971 break; 972 } 973 mesh_upper_transport_run(); 974 break; 975 default: 976 break; 977 } 978 } 979 980 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 981 mesh_network_pdu_t * network_pdu; 982 mesh_segmented_pdu_t * message_pdu; 983 switch (pdu->pdu_type) { 984 case MESH_PDU_TYPE_NETWORK: 985 network_pdu = (mesh_network_pdu_t *) pdu; 986 mesh_network_pdu_free(network_pdu); 987 break; 988 case MESH_PDU_TYPE_SEGMENTED: 989 message_pdu = (mesh_segmented_pdu_t *) pdu; 990 mesh_message_pdu_free(message_pdu); 991 default: 992 btstack_assert(false); 993 break; 994 } 995 } 996 997 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 998 crypto_active = 0; 999 switch (pdu->pdu_type){ 1000 case MESH_PDU_TYPE_ACCESS: 1001 mesh_upper_transport_process_access_message_done((mesh_access_pdu_t *) pdu); 1002 case MESH_PDU_TYPE_CONTROL: 1003 mesh_upper_transport_process_control_message_done((mesh_control_pdu_t *) pdu); 1004 break; 1005 default: 1006 btstack_assert(0); 1007 break; 1008 } 1009 } 1010 1011 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 1012 switch (pdu->pdu_type){ 1013 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1014 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1015 break; 1016 default: 1017 btstack_assert(false); 1018 break; 1019 } 1020 1021 btstack_assert(((mesh_upper_transport_pdu_t *) pdu)->lower_pdu == NULL); 1022 1023 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1024 mesh_upper_transport_run(); 1025 } 1026 1027 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 1028 switch (pdu->pdu_type){ 1029 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1030 break; 1031 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1032 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 1033 break; 1034 default: 1035 btstack_assert(false); 1036 break; 1037 } 1038 1039 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1040 mesh_upper_transport_run(); 1041 } 1042 1043 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, 1044 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1045 1046 if (control_pdu_len > 11) return 1; 1047 1048 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1049 if (!network_key) return 1; 1050 1051 uint8_t transport_pdu_data[12]; 1052 transport_pdu_data[0] = opcode; 1053 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 1054 uint16_t transport_pdu_len = control_pdu_len + 1; 1055 1056 // setup network_pdu 1057 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 1058 1059 return 0; 1060 } 1061 1062 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, 1063 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1064 1065 if (control_pdu_len > 256) return 1; 1066 1067 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 1068 if (!network_key) return 1; 1069 1070 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1071 upper_pdu->ctl_ttl = ttl; 1072 upper_pdu->src = src; 1073 upper_pdu->dst = dest; 1074 upper_pdu->transmic_len = 0; // no TransMIC for control 1075 upper_pdu->netkey_index = netkey_index; 1076 upper_pdu->akf_aid_control = opcode; 1077 1078 // allocate segments 1079 btstack_linked_list_t free_segments = NULL; 1080 bool ok = mesh_segmented_allocate_segments( &free_segments, control_pdu_len); 1081 if (!ok) return 1; 1082 // store control pdu 1083 mesh_segmented_store_payload(control_pdu_data, control_pdu_len, &free_segments, &upper_pdu->segments); 1084 upper_pdu->len = control_pdu_len; 1085 return 0; 1086 } 1087 1088 uint8_t mesh_upper_transport_setup_control_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, 1089 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 1090 switch (pdu->pdu_type){ 1091 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_CONTROL: 1092 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); 1093 case MESH_PDU_TYPE_UPPER_SEGMENTED_CONTROL: 1094 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); 1095 default: 1096 btstack_assert(0); 1097 return 1; 1098 } 1099 } 1100 1101 static uint8_t mesh_upper_transport_setup_segmented_access_pdu_header(mesh_access_pdu_t * access_pdu, uint16_t netkey_index, 1102 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1103 1104 // get app or device key 1105 const mesh_transport_key_t *appkey; 1106 appkey = mesh_transport_key_get(appkey_index); 1107 if (appkey == NULL) { 1108 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 1109 return 1; 1110 } 1111 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1112 1113 // lookup network by netkey_index 1114 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 1115 if (!network_key) return 1; 1116 if (network_key == NULL) { 1117 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 1118 return 1; 1119 } 1120 1121 const uint8_t trans_mic_len = szmic ? 8 : 4; 1122 1123 // store in transport pdu 1124 access_pdu->transmic_len = trans_mic_len; 1125 access_pdu->netkey_index = netkey_index; 1126 access_pdu->appkey_index = appkey_index; 1127 access_pdu->akf_aid_control = akf_aid; 1128 mesh_access_set_nid_ivi(access_pdu, network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7)); 1129 mesh_access_set_src(access_pdu, src); 1130 mesh_access_set_dest(access_pdu, dest); 1131 mesh_access_set_ctl_ttl(access_pdu, ttl); 1132 return 0; 1133 } 1134 1135 static uint8_t mesh_upper_transport_setup_upper_access_pdu_header(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, 1136 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1137 1138 // get app or device key 1139 const mesh_transport_key_t *appkey; 1140 appkey = mesh_transport_key_get(appkey_index); 1141 if (appkey == NULL) { 1142 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 1143 return 1; 1144 } 1145 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 1146 1147 // lookup network by netkey_index 1148 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 1149 if (!network_key) return 1; 1150 if (network_key == NULL) { 1151 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 1152 return 1; 1153 } 1154 1155 const uint8_t trans_mic_len = szmic ? 8 : 4; 1156 1157 // store in transport pdu 1158 upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); 1159 upper_pdu->ctl_ttl = ttl; 1160 upper_pdu->src = src; 1161 upper_pdu->dst = dest; 1162 upper_pdu->transmic_len = trans_mic_len; 1163 upper_pdu->netkey_index = netkey_index; 1164 upper_pdu->appkey_index = appkey_index; 1165 upper_pdu->akf_aid_control = akf_aid; 1166 return 0; 1167 } 1168 1169 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, 1170 uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 1171 int status = mesh_upper_transport_setup_upper_access_pdu_header(upper_pdu, netkey_index, appkey_index, ttl, src, 1172 dest, szmic); 1173 if (status) return status; 1174 1175 // allocate segments 1176 btstack_linked_list_t free_segments = NULL; 1177 bool ok = mesh_segmented_allocate_segments( &free_segments, access_pdu_len); 1178 if (!ok) return 1; 1179 // store control pdu 1180 mesh_segmented_store_payload(access_pdu_data, access_pdu_len, &free_segments, &upper_pdu->segments); 1181 upper_pdu->len = access_pdu_len; 1182 return 0; 1183 } 1184 1185 1186 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 1187 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 1188 switch (pdu->pdu_type){ 1189 case MESH_PDU_TYPE_ACCESS: 1190 return mesh_upper_transport_setup_segmented_access_pdu_header((mesh_access_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 1191 default: 1192 btstack_assert(false); 1193 return 1; 1194 } 1195 } 1196 1197 uint8_t mesh_upper_transport_setup_access_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 1198 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic, 1199 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 1200 switch (pdu->pdu_type){ 1201 case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: 1202 case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: 1203 return mesh_upper_transport_setup_upper_access_pdu((mesh_upper_transport_pdu_t *) pdu, netkey_index, 1204 appkey_index, ttl, src, dest, szmic, access_pdu_data, 1205 access_pdu_len); 1206 default: 1207 btstack_assert(false); 1208 return 1; 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