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