/* * Copyright (C) 2014 BlueKitchen GmbH * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the copyright holders nor the names of * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * 4. Any redistribution, use, or modification is done solely for * personal benefit and not for any commercial purpose or for * monetary gain. * * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Please inquire about commercial licensing options at * contact@bluekitchen-gmbh.com * */ #define BTSTACK_FILE__ "mesh_upper_transport.c" #include "mesh/mesh_upper_transport.h" #include #include #include #include "btstack_util.h" #include "btstack_memory.h" #include "btstack_debug.h" #include "mesh/beacon.h" #include "mesh/mesh_iv_index_seq_number.h" #include "mesh/mesh_keys.h" #include "mesh/mesh_lower_transport.h" #include "mesh/mesh_peer.h" #include "mesh/mesh_virtual_addresses.h" // TODO: extract mesh_pdu functions into lower transport or network #include "mesh/mesh_access.h" // combined key x address iterator for upper transport decryption typedef struct { // state mesh_transport_key_iterator_t key_it; mesh_virtual_address_iterator_t address_it; // elements const mesh_transport_key_t * key; const mesh_virtual_address_t * address; // address - might be virtual uint16_t dst; // key info } mesh_transport_key_and_virtual_address_iterator_t; static void mesh_upper_transport_validate_segmented_message(void); static void mesh_upper_transport_run(void); static int crypto_active; static mesh_unsegmented_pdu_t * incoming_unsegmented_pdu_raw; static mesh_segmented_pdu_t incoming_message_pdu_singleton; static mesh_access_pdu_t * incoming_access_pdu_encrypted; static mesh_access_pdu_t * incoming_access_pdu_decrypted; static mesh_access_pdu_t incoming_access_pdu_encrypted_singleton; static mesh_access_pdu_t incoming_access_pdu_decrypted_singleton; static mesh_control_pdu_t incoming_control_pdu_singleton; static mesh_control_pdu_t * incoming_control_pdu; static mesh_segmented_pdu_t outgoing_segmented_message_singleton; static mesh_access_pdu_t * outgoing_segmented_access_pdu; static mesh_unsegmented_pdu_t outgoing_unsegmented_pdu_singleton; static mesh_upper_transport_pdu_t * outgoing_upper_transport_pdu; static uint8_t application_nonce[13]; static btstack_crypto_ccm_t ccm; static uint8_t crypto_buffer[MESH_ACCESS_PAYLOAD_MAX]; static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; // upper transport callbacks - in access layer static void (*mesh_access_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); static void (*mesh_control_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); // incoming unsegmented (network) and segmented (transport) control and access messages static btstack_linked_list_t upper_transport_incoming; // outgoing unsegmented (network) and segmented (uppert_transport_outgoing) control and access messages static btstack_linked_list_t upper_transport_outgoing; // TODO: higher layer define used for assert #define MESH_ACCESS_OPCODE_NOT_SET 0xFFFFFFFEu void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ switch (pdu->pdu_type){ case MESH_PDU_TYPE_UNSEGMENTED: case MESH_PDU_TYPE_ACCESS: case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: break; default: btstack_assert(false); break; } btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); mesh_upper_transport_run(); } void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ if (pdu->pdu_type == MESH_PDU_TYPE_NETWORK){ btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); } btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); mesh_upper_transport_run(); } static void mesh_print_hex(const char * name, const uint8_t * data, uint16_t len){ printf("%-20s ", name); printf_hexdump(data, len); } // static void mesh_print_x(const char * name, uint32_t value){ // printf("%20s: 0x%x", name, (int) value); // } static void mesh_transport_key_and_virtual_address_iterator_init(mesh_transport_key_and_virtual_address_iterator_t *it, uint16_t dst, uint16_t netkey_index, uint8_t akf, uint8_t aid) { printf("KEY_INIT: dst %04x, akf %x, aid %x\n", dst, akf, aid); // config it->dst = dst; // init elements it->key = NULL; it->address = NULL; // init element iterators mesh_transport_key_aid_iterator_init(&it->key_it, netkey_index, akf, aid); // init address iterator if (mesh_network_address_virtual(it->dst)){ mesh_virtual_address_iterator_init(&it->address_it, dst); // get first key if (mesh_transport_key_aid_iterator_has_more(&it->key_it)) { it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); } } } // cartesian product: keys x addressses static int mesh_transport_key_and_virtual_address_iterator_has_more(mesh_transport_key_and_virtual_address_iterator_t * it){ if (mesh_network_address_virtual(it->dst)) { // find next valid entry while (true){ if (mesh_virtual_address_iterator_has_more(&it->address_it)) return 1; if (!mesh_transport_key_aid_iterator_has_more(&it->key_it)) return 0; // get next key it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); mesh_virtual_address_iterator_init(&it->address_it, it->dst); } } else { return mesh_transport_key_aid_iterator_has_more(&it->key_it); } } static void mesh_transport_key_and_virtual_address_iterator_next(mesh_transport_key_and_virtual_address_iterator_t * it){ if (mesh_network_address_virtual(it->dst)) { it->address = mesh_virtual_address_iterator_get_next(&it->address_it); } else { it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); } } // UPPER TRANSPORT uint16_t mesh_access_dst(mesh_access_pdu_t * access_pdu){ return big_endian_read_16(access_pdu->network_header, 7); } uint16_t mesh_access_ctl(mesh_access_pdu_t * access_pdu){ return access_pdu->network_header[1] >> 7; } uint32_t mesh_access_seq(mesh_access_pdu_t * access_pdu){ return big_endian_read_24(access_pdu->network_header, 2); } void mesh_access_set_nid_ivi(mesh_access_pdu_t * access_pdu, uint8_t nid_ivi){ access_pdu->network_header[0] = nid_ivi; } void mesh_access_set_ctl_ttl(mesh_access_pdu_t * access_pdu, uint8_t ctl_ttl){ access_pdu->network_header[1] = ctl_ttl; } void mesh_access_set_seq(mesh_access_pdu_t * access_pdu, uint32_t seq){ big_endian_store_24(access_pdu->network_header, 2, seq); } void mesh_access_set_src(mesh_access_pdu_t * access_pdu, uint16_t src){ big_endian_store_16(access_pdu->network_header, 5, src); } void mesh_access_set_dest(mesh_access_pdu_t * access_pdu, uint16_t dest){ big_endian_store_16(access_pdu->network_header, 7, dest); } static void mesh_segmented_pdu_flatten(btstack_linked_list_t * segments, uint8_t segment_len, uint8_t * buffer) { // assemble payload btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, segments); while (btstack_linked_list_iterator_has_next(&it)) { mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); // get segment n uint8_t *lower_transport_pdu = mesh_network_pdu_data(segment); uint8_t seg_o = (big_endian_read_16(lower_transport_pdu, 2) >> 5) & 0x001f; uint8_t *segment_data = &lower_transport_pdu[4]; (void) memcpy(&buffer[seg_o * segment_len], segment_data, segment_len); } } static uint16_t mesh_upper_pdu_flatten(mesh_upper_transport_pdu_t * upper_pdu, uint8_t * buffer, uint16_t buffer_len) { // assemble payload btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, &upper_pdu->segments); uint16_t offset = 0; while (btstack_linked_list_iterator_has_next(&it)) { mesh_network_pdu_t *segment = (mesh_network_pdu_t *) btstack_linked_list_iterator_next(&it); btstack_assert(segment->pdu_header.pdu_type == MESH_PDU_TYPE_NETWORK); btstack_assert((offset + segment->len) <= buffer_len); (void) memcpy(&buffer[offset], segment->data, segment->len); offset += segment->len; } return offset; } static void mesh_segmented_append_payload(const uint8_t * payload, uint16_t payload_len, btstack_linked_list_t * segments){ uint16_t payload_offset = 0; uint16_t bytes_current_segment = 0; mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_last_item(segments); if (network_pdu){ bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX - network_pdu->len; } while (payload_offset < payload_len){ if (bytes_current_segment == 0){ network_pdu = mesh_network_pdu_get(); btstack_assert(network_pdu != NULL); btstack_linked_list_add_tail(segments, (btstack_linked_item_t *) network_pdu); bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX; } uint16_t bytes_to_copy = btstack_min(bytes_current_segment, payload_len - payload_offset); (void) memcpy(&network_pdu->data[network_pdu->len], &payload[payload_offset], bytes_to_copy); bytes_current_segment -= bytes_to_copy; network_pdu->len += bytes_to_copy; payload_offset += bytes_to_copy; } } // stub lower transport static void mesh_upper_transport_dump_pdus(const char *name, btstack_linked_list_t *list){ printf("List: %s:\n", name); btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, list); while (btstack_linked_list_iterator_has_next(&it)){ mesh_pdu_t * pdu = (mesh_pdu_t*) btstack_linked_list_iterator_next(&it); printf("- %p\n", pdu); // printf_hexdump( mesh_pdu_data(pdu), mesh_pdu_len(pdu)); } } static void mesh_upper_transport_reset_pdus(btstack_linked_list_t *list){ while (!btstack_linked_list_empty(list)){ mesh_upper_transport_pdu_free((mesh_pdu_t *) btstack_linked_list_pop(list)); } } void mesh_upper_transport_dump(void){ printf("incoming_unsegmented_pdu_raw: %p\n", incoming_unsegmented_pdu_raw); mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); } void mesh_upper_transport_reset(void){ crypto_active = 0; if (incoming_unsegmented_pdu_raw){ mesh_network_pdu_t * network_pdu = incoming_unsegmented_pdu_raw->segment; btstack_assert(network_pdu != NULL); incoming_unsegmented_pdu_raw->segment = NULL; mesh_network_pdu_free(network_pdu); incoming_unsegmented_pdu_raw = NULL; } outgoing_segmented_access_pdu = NULL; mesh_upper_transport_reset_pdus(&upper_transport_incoming); } static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ // get IV Index and IVI uint32_t iv_index = mesh_get_iv_index(); int ivi = ivi_nid >> 7; // if least significant bit differs, use previous IV Index if ((iv_index & 1 ) ^ ivi){ iv_index--; } return iv_index; } static void transport_unsegmented_setup_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ nonce[1] = 0x00; // SZMIC if a Segmented Access message or 0 for all other message formats (void)memcpy(&nonce[2], &network_pdu->data[2], 7); big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(network_pdu->data[0])); } static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ mesh_access_pdu_t * access_pdu; mesh_upper_transport_pdu_t * upper_pdu; switch (pdu->pdu_type){ case MESH_PDU_TYPE_ACCESS: access_pdu = (mesh_access_pdu_t *) pdu; nonce[1] = access_pdu->transmic_len == 8 ? 0x80 : 0x00; (void)memcpy(&nonce[2], &access_pdu->network_header[2], 7); big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(access_pdu->network_header[0])); break; case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: upper_pdu = (mesh_upper_transport_pdu_t *) pdu; nonce[1] = upper_pdu->transmic_len == 8 ? 0x80 : 0x00; // 'network header' big_endian_store_24(nonce, 2, upper_pdu->seq); big_endian_store_16(nonce, 5, upper_pdu->src); big_endian_store_16(nonce, 7, upper_pdu->dst); big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(upper_pdu->ivi_nid)); break; default: btstack_assert(0); break; } } static void transport_unsegmented_setup_application_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ nonce[0] = 0x01; transport_unsegmented_setup_nonce(nonce, network_pdu); mesh_print_hex("AppNonce", nonce, 13); } static void transport_unsegmented_setup_device_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ nonce[0] = 0x02; transport_unsegmented_setup_nonce(nonce, network_pdu); mesh_print_hex("DeviceNonce", nonce, 13); } static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ nonce[0] = 0x01; transport_segmented_setup_nonce(nonce, pdu); mesh_print_hex("AppNonce", nonce, 13); } static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ nonce[0] = 0x02; transport_segmented_setup_nonce(nonce, pdu); mesh_print_hex("DeviceNonce", nonce, 13); } static void mesh_upper_transport_process_message_done(mesh_segmented_pdu_t *message_pdu){ crypto_active = 0; btstack_assert(message_pdu == &incoming_message_pdu_singleton); mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&incoming_message_pdu_singleton.segments); if (mesh_network_control(network_pdu)) { btstack_assert(0); } else { btstack_assert(network_pdu != NULL); mesh_network_pdu_free(network_pdu); mesh_pdu_t * pdu = (mesh_pdu_t *) incoming_unsegmented_pdu_raw; incoming_unsegmented_pdu_raw = NULL; mesh_lower_transport_message_processed_by_higher_layer(pdu); } mesh_upper_transport_run(); } static void mesh_upper_transport_process_unsegmented_message_done(mesh_pdu_t * pdu){ btstack_assert(pdu != NULL); btstack_assert(pdu->pdu_type == MESH_PDU_TYPE_UNSEGMENTED); mesh_unsegmented_pdu_t * unsegmented_incoming_pdu = (mesh_unsegmented_pdu_t *) pdu; btstack_assert(unsegmented_incoming_pdu == incoming_unsegmented_pdu_raw); crypto_active = 0; incoming_unsegmented_pdu_raw = NULL; mesh_network_pdu_t * network_pdu = unsegmented_incoming_pdu->segment; if (!mesh_network_control(network_pdu)) { mesh_network_pdu_free(network_pdu); } mesh_lower_transport_message_processed_by_higher_layer(pdu); mesh_upper_transport_run(); } static void mesh_upper_transport_process_access_message_done(mesh_access_pdu_t *access_pdu){ crypto_active = 0; btstack_assert(mesh_access_ctl(access_pdu) == 0); incoming_access_pdu_encrypted = NULL; mesh_upper_transport_run(); } static void mesh_upper_transport_process_control_message_done(mesh_control_pdu_t * control_pdu){ crypto_active = 0; incoming_control_pdu = NULL; mesh_upper_transport_run(); } static void mesh_upper_transport_validate_segmented_message_ccm(void * arg){ UNUSED(arg); uint8_t * upper_transport_pdu = incoming_access_pdu_decrypted->data; uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); // store TransMIC uint8_t trans_mic[8]; btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); mesh_print_hex("TransMIC", trans_mic, incoming_access_pdu_decrypted->transmic_len); if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], incoming_access_pdu_decrypted->transmic_len) == 0){ printf("TransMIC matches\n"); // remove TransMIC from payload incoming_access_pdu_decrypted->len -= incoming_access_pdu_decrypted->transmic_len; // if virtual address, update dst to pseudo_dst if (mesh_network_address_virtual(mesh_access_dst(incoming_access_pdu_decrypted))){ big_endian_store_16(incoming_access_pdu_decrypted->network_header, 7, mesh_transport_key_it.address->pseudo_dst); } // pass to upper layer btstack_assert(mesh_access_message_handler != NULL); mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_access_pdu_decrypted; mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); printf("\n"); } else { uint8_t akf = incoming_access_pdu_decrypted->akf_aid_control & 0x40; if (akf){ printf("TransMIC does not match, try next key\n"); mesh_upper_transport_validate_segmented_message(); } else { printf("TransMIC does not match device key, done\n"); // done mesh_upper_transport_process_access_message_done(incoming_access_pdu_decrypted); } } } static void mesh_upper_transport_validate_segmented_message_digest(void * arg){ UNUSED(arg); uint8_t upper_transport_pdu_len = incoming_access_pdu_encrypted->len - incoming_access_pdu_encrypted->transmic_len; uint8_t * upper_transport_pdu_data_in = incoming_access_pdu_encrypted->data; uint8_t * upper_transport_pdu_data_out = incoming_access_pdu_decrypted->data; 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); } static void mesh_upper_transport_validate_segmented_message(void){ uint8_t * upper_transport_pdu_data = incoming_access_pdu_decrypted->data; uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ printf("No valid transport key found\n"); mesh_upper_transport_process_access_message_done(incoming_access_pdu_decrypted); return; } mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); const mesh_transport_key_t * message_key = mesh_transport_key_it.key; if (message_key->akf){ transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) incoming_access_pdu_encrypted); } else { transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) incoming_access_pdu_encrypted); } // store application / device key index mesh_print_hex("AppOrDevKey", message_key->key, 16); incoming_access_pdu_decrypted->appkey_index = message_key->appkey_index; mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); // decrypt ccm crypto_active = 1; uint16_t aad_len = 0; if (mesh_network_address_virtual(mesh_access_dst(incoming_access_pdu_decrypted))){ aad_len = 16; } btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, incoming_access_pdu_decrypted->transmic_len); if (aad_len){ btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_segmented_message_digest, NULL); } else { mesh_upper_transport_validate_segmented_message_digest(NULL); } } static void mesh_upper_transport_process_segmented_message(void){ // copy original pdu (void)memcpy(incoming_access_pdu_decrypted, incoming_access_pdu_encrypted, sizeof(mesh_access_pdu_t)); // uint8_t * upper_transport_pdu = incoming_access_pdu_decrypted->data; uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); uint8_t aid = incoming_access_pdu_decrypted->akf_aid_control & 0x3f; uint8_t akf = (incoming_access_pdu_decrypted->akf_aid_control & 0x40) >> 6; printf("AKF: %u\n", akf); printf("AID: %02x\n", aid); mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_access_dst(incoming_access_pdu_decrypted), incoming_access_pdu_decrypted->netkey_index, akf, aid); mesh_upper_transport_validate_segmented_message(); } static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); mesh_upper_transport_run(); } static void mesh_upper_transport_send_unsegmented_access_pdu_ccm(void * arg){ crypto_active = 0; mesh_unsegmented_pdu_t * unsegmented_pdu = (mesh_unsegmented_pdu_t *) arg; mesh_network_pdu_t * network_pdu = unsegmented_pdu->segment; uint8_t * upper_transport_pdu = mesh_network_pdu_data(network_pdu) + 1; uint8_t upper_transport_pdu_len = mesh_network_pdu_len(network_pdu) - 1; mesh_print_hex("EncAccessPayload", upper_transport_pdu, upper_transport_pdu_len); // store TransMIC btstack_crypto_ccm_get_authentication_value(&ccm, &upper_transport_pdu[upper_transport_pdu_len]); mesh_print_hex("TransMIC", &upper_transport_pdu[upper_transport_pdu_len], 4); network_pdu->len += 4; upper_transport_pdu_len += 4; mesh_print_hex("UpperTransportPDU", upper_transport_pdu, upper_transport_pdu_len); // send network pdu mesh_lower_transport_send_pdu((mesh_pdu_t*) unsegmented_pdu); } static void mesh_upper_transport_send_segmented_pdu(mesh_access_pdu_t * access_pdu){ outgoing_segmented_access_pdu = access_pdu; mesh_segmented_pdu_t * message_pdu = &outgoing_segmented_message_singleton; message_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; // convert mesh_access_pdu_t into mesh_segmented_pdu_t mesh_segmented_append_payload(access_pdu->data, access_pdu->len, &message_pdu->segments); // copy meta message_pdu->len = access_pdu->len; message_pdu->netkey_index = access_pdu->netkey_index; message_pdu->transmic_len = access_pdu->transmic_len; message_pdu->akf_aid_control = access_pdu->akf_aid_control; message_pdu->flags = access_pdu->flags; (void)memcpy(message_pdu->network_header, access_pdu->network_header, 9); mesh_lower_transport_send_pdu((mesh_pdu_t*) message_pdu); } static void mesh_upper_transport_send_segmented_access_pdu_ccm(void * arg){ crypto_active = 0; mesh_access_pdu_t * access_pdu = (mesh_access_pdu_t *) arg; mesh_print_hex("EncAccessPayload", access_pdu->data, access_pdu->len); // store TransMIC btstack_crypto_ccm_get_authentication_value(&ccm, &access_pdu->data[access_pdu->len]); mesh_print_hex("TransMIC", &access_pdu->data[access_pdu->len], access_pdu->transmic_len); access_pdu->len += access_pdu->transmic_len; mesh_print_hex("UpperTransportPDU", access_pdu->data, access_pdu->len); mesh_upper_transport_send_segmented_pdu(access_pdu); } 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, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ if (control_pdu_len > 11) return 1; const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); if (!network_key) return 1; uint8_t transport_pdu_data[12]; transport_pdu_data[0] = opcode; (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); uint16_t transport_pdu_len = control_pdu_len + 1; // setup network_pdu mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); return 0; } #if 0 static uint8_t mesh_upper_transport_setup_segmented_control_pdu(mesh_transport_pdu_t * transport_pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ if (control_pdu_len > 256) return 1; const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); if (!network_key) return 1; (void)memcpy(transport_pdu->data, control_pdu_data, control_pdu_len); transport_pdu->len = control_pdu_len; transport_pdu->netkey_index = netkey_index; transport_pdu->akf_aid_control = opcode; transport_pdu->transmic_len = 0; // no TransMIC for control mesh_transport_set_nid_ivi(transport_pdu, network_key->nid); mesh_transport_set_src(transport_pdu, src); mesh_transport_set_dest(transport_pdu, dest); mesh_transport_set_ctl_ttl(transport_pdu, 0x80 | ttl); return 0; } #endif uint8_t mesh_upper_transport_setup_control_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ switch (pdu->pdu_type){ case MESH_PDU_TYPE_NETWORK: 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); default: btstack_assert(0); return 1; } } static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu_header(mesh_unsegmented_pdu_t * unsegmented_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest){ mesh_network_pdu_t * network_pdu = unsegmented_pdu->segment; // get app or device key const mesh_transport_key_t * appkey; appkey = mesh_transport_key_get(appkey_index); if (appkey == NULL){ printf("appkey_index %x unknown\n", appkey_index); return 1; } uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; // lookup network by netkey_index const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); if (!network_key) return 1; unsegmented_pdu->appkey_index = appkey_index; network_pdu->data[9] = akf_aid; // setup network_pdu mesh_network_setup_pdu_header(network_pdu, netkey_index, network_key->nid, 0, ttl, 0, src, dest); return 0; } static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu(mesh_unsegmented_pdu_t * unsegmented_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ int status = mesh_upper_transport_setup_unsegmented_access_pdu_header(unsegmented_pdu, netkey_index, appkey_index, ttl, src, dest); if (status) return status; // store in unsegmented pdu mesh_network_pdu_t * network_pdu = unsegmented_pdu->segment; (void)memcpy(&network_pdu->data[10], access_pdu_data, access_pdu_len); network_pdu->len = 10 + access_pdu_len; return 0; } static uint8_t mesh_upper_transport_setup_segmented_access_pdu_header(mesh_access_pdu_t * access_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ // get app or device key const mesh_transport_key_t *appkey; appkey = mesh_transport_key_get(appkey_index); if (appkey == NULL) { printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); return 1; } uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; // lookup network by netkey_index const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); if (!network_key) return 1; if (network_key == NULL) { printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); return 1; } const uint8_t trans_mic_len = szmic ? 8 : 4; // store in transport pdu access_pdu->transmic_len = trans_mic_len; access_pdu->netkey_index = netkey_index; access_pdu->appkey_index = appkey_index; access_pdu->akf_aid_control = akf_aid; mesh_access_set_nid_ivi(access_pdu, network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7)); mesh_access_set_src(access_pdu, src); mesh_access_set_dest(access_pdu, dest); mesh_access_set_ctl_ttl(access_pdu, ttl); return 0; } static uint8_t mesh_upper_transport_setup_upper_access_pdu_header(mesh_upper_transport_pdu_t * upper_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ // get app or device key const mesh_transport_key_t *appkey; appkey = mesh_transport_key_get(appkey_index); if (appkey == NULL) { printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); return 1; } uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; // lookup network by netkey_index const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); if (!network_key) return 1; if (network_key == NULL) { printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); return 1; } const uint8_t trans_mic_len = szmic ? 8 : 4; // store in transport pdu upper_pdu->ivi_nid = network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7); upper_pdu->ctl_ttl = ttl; upper_pdu->src = src; upper_pdu->dst = dest; upper_pdu->transmic_len = trans_mic_len; upper_pdu->netkey_index = netkey_index; upper_pdu->appkey_index = appkey_index; upper_pdu->akf_aid_control = akf_aid; return 0; } static uint8_t mesh_upper_transport_setup_segmented_access_pdu(mesh_access_pdu_t * access_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ int status = mesh_upper_transport_setup_segmented_access_pdu_header(access_pdu, netkey_index, appkey_index, ttl, src, dest, szmic); if (status) return status; // store in transport pdu (void)memcpy(access_pdu->data, access_pdu_data, access_pdu_len); access_pdu->len = access_pdu_len; return 0; } 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, uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ int status = mesh_upper_transport_setup_upper_access_pdu_header(upper_pdu, netkey_index, appkey_index, ttl, src, dest, szmic); if (status) return status; // store in transport pdu uint16_t offset = 0; mesh_segmented_append_payload(access_pdu_data, access_pdu_len, &upper_pdu->segments); upper_pdu->len = access_pdu_len; return 0; } uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ switch (pdu->pdu_type){ case MESH_PDU_TYPE_ACCESS: return mesh_upper_transport_setup_segmented_access_pdu_header((mesh_access_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic); case MESH_PDU_TYPE_UNSEGMENTED: return mesh_upper_transport_setup_unsegmented_access_pdu_header((mesh_unsegmented_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest); default: btstack_assert(false); return 1; } } uint8_t mesh_upper_transport_setup_access_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ switch (pdu->pdu_type){ case MESH_PDU_TYPE_UNSEGMENTED: return mesh_upper_transport_setup_unsegmented_access_pdu((mesh_unsegmented_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, access_pdu_data, access_pdu_len); case MESH_PDU_TYPE_ACCESS: return mesh_upper_transport_setup_segmented_access_pdu((mesh_access_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic, access_pdu_data, access_pdu_len); case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: return mesh_upper_transport_setup_upper_access_pdu((mesh_upper_transport_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic, access_pdu_data, access_pdu_len); default: btstack_assert(false); return 1; } } static void mesh_upper_transport_send_unsegmented_access_pdu_digest(void * arg){ mesh_unsegmented_pdu_t * unsegmented_pdu = (mesh_unsegmented_pdu_t *) arg; mesh_network_pdu_t * network_pdu = unsegmented_pdu->segment; uint8_t * access_pdu_data = mesh_network_pdu_data(network_pdu) + 1; uint16_t access_pdu_len = mesh_network_pdu_len(network_pdu) - 1; btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, access_pdu_data, access_pdu_data, &mesh_upper_transport_send_unsegmented_access_pdu_ccm, unsegmented_pdu); } static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ // Device Key is fixed if (appkey_index == MESH_DEVICE_KEY_INDEX) { return mesh_transport_key_get(appkey_index); } // Get key refresh state from subnet mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); if (subnet == NULL) return NULL; // identify old and new app keys for given appkey_index mesh_transport_key_t * old_key = NULL; mesh_transport_key_t * new_key = NULL; mesh_transport_key_iterator_t it; mesh_transport_key_iterator_init(&it, netkey_index); while (mesh_transport_key_iterator_has_more(&it)){ mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); if (transport_key->appkey_index != appkey_index) continue; if (transport_key->old_key == 0) { new_key = transport_key; } else { old_key = transport_key; } } // if no key is marked as old, just use the current one if (old_key == NULL) return new_key; // use new key if it exists in phase two if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ return new_key; } else { return old_key; } } static void mesh_upper_transport_send_unsegmented_access_pdu(mesh_unsegmented_pdu_t * unsegmented_pdu){ mesh_network_pdu_t * network_pdu = unsegmented_pdu->segment; // if dst is virtual address, lookup label uuid and hash uint16_t aad_len = 0; mesh_virtual_address_t * virtual_address = NULL; uint16_t dst = mesh_network_dst(network_pdu); if (mesh_network_address_virtual(dst)){ virtual_address = mesh_virtual_address_for_pseudo_dst(dst); if (!virtual_address){ printf("No virtual address register for pseudo dst %4x\n", dst); btstack_memory_mesh_network_pdu_free(network_pdu); return; } aad_len = 16; big_endian_store_16(network_pdu->data, 7, virtual_address->hash); } // reserve slot mesh_lower_transport_reserve_slot(); // Nonce for Access Payload based on Network Sequence number: needs to be fixed now and lower layers need to send packet in right order uint32_t seq = mesh_sequence_number_next(); mesh_network_pdu_set_seq(network_pdu, seq); // Dump PDU printf("[+] Upper transport, send unsegmented Access PDU - dest %04x, seq %06x\n", dst, mesh_network_seq(network_pdu)); mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); // setup nonce uint16_t appkey_index = unsegmented_pdu->appkey_index; if (appkey_index == MESH_DEVICE_KEY_INDEX){ transport_unsegmented_setup_device_nonce(application_nonce, network_pdu); } else { transport_unsegmented_setup_application_nonce(application_nonce, network_pdu); } // get app or device key const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(network_pdu->netkey_index, appkey_index); mesh_print_hex("AppOrDevKey", appkey->key, 16); // encrypt ccm uint8_t trans_mic_len = 4; uint16_t access_pdu_len = mesh_network_pdu_len(network_pdu) - 1; crypto_active = 1; btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, trans_mic_len); if (virtual_address){ mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, &mesh_upper_transport_send_unsegmented_access_pdu_digest, unsegmented_pdu); } else { mesh_upper_transport_send_unsegmented_access_pdu_digest(unsegmented_pdu); } } static void mesh_upper_transport_send_segmented_access_pdu_digest(void *arg){ mesh_access_pdu_t * access_pdu = (mesh_access_pdu_t *) arg; uint16_t access_pdu_len = access_pdu->len; uint8_t * access_pdu_data = access_pdu->data; btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len,access_pdu_data, access_pdu_data, &mesh_upper_transport_send_segmented_access_pdu_ccm, access_pdu); } static void mesh_upper_transport_send_segmented_access_pdu(mesh_access_pdu_t * access_pdu){ // if dst is virtual address, lookup label uuid and hash uint16_t aad_len = 0; mesh_virtual_address_t * virtual_address = NULL; uint16_t dst = mesh_access_dst(access_pdu); if (mesh_network_address_virtual(dst)){ virtual_address = mesh_virtual_address_for_pseudo_dst(dst); if (!virtual_address){ printf("No virtual address register for pseudo dst %4x\n", dst); mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) access_pdu); return; } // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); // printf_hexdump(virtual_address->label_uuid, 16); aad_len = 16; big_endian_store_16(access_pdu->network_header, 7, virtual_address->hash); } // get app or device key uint16_t appkey_index = access_pdu->appkey_index; const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(access_pdu->netkey_index, appkey_index); if (appkey == NULL){ printf("AppKey %04x not found, drop message\n", appkey_index); mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) access_pdu); return; } // reserve slot mesh_lower_transport_reserve_slot(); // reserve one sequence number, which is also used to encrypt access payload uint32_t seq = mesh_sequence_number_next(); access_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; mesh_access_set_seq(access_pdu, seq); // Dump PDU printf("[+] Upper transport, send segmented Access PDU - dest %04x, seq %06x\n", dst, mesh_access_seq(access_pdu)); mesh_print_hex("Access Payload", access_pdu->data, access_pdu->len); // setup nonce - uses dst, so after pseudo address translation if (appkey_index == MESH_DEVICE_KEY_INDEX){ transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) access_pdu); } else { transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) access_pdu); } // Dump key mesh_print_hex("AppOrDevKey", appkey->key, 16); // encrypt ccm uint8_t transmic_len = access_pdu->transmic_len; uint16_t access_pdu_len = access_pdu->len; crypto_active = 1; btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); if (virtual_address){ mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, &mesh_upper_transport_send_segmented_access_pdu_digest, access_pdu); } else { mesh_upper_transport_send_segmented_access_pdu_digest(access_pdu); } } static void mesh_upper_transport_send_upper_segmented_pdu(mesh_upper_transport_pdu_t * upper_pdu){ // TODO: store upper pdu in outgoing pdus active or similar outgoing_upper_transport_pdu = upper_pdu; mesh_segmented_pdu_t * message_pdu = &outgoing_segmented_message_singleton; message_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; // convert mesh_access_pdu_t into mesh_segmented_pdu_t mesh_segmented_append_payload(crypto_buffer, upper_pdu->len, &message_pdu->segments); // copy meta message_pdu->len = upper_pdu->len; message_pdu->netkey_index = upper_pdu->netkey_index; message_pdu->transmic_len = upper_pdu->transmic_len; message_pdu->akf_aid_control = upper_pdu->akf_aid_control; message_pdu->flags = upper_pdu->flags; // setup message_pdu header // (void)memcpy(message_pdu->network_header, upper_pdu->network_header, 9); // TODO: use fields in mesh_segmented_pdu_t and setup network header in lower transport message_pdu->network_header[0] = upper_pdu->ivi_nid; message_pdu->network_header[1] = upper_pdu->ctl_ttl; big_endian_store_24(message_pdu->network_header, 2, upper_pdu->seq); big_endian_store_16(message_pdu->network_header, 5, upper_pdu->src); big_endian_store_16(message_pdu->network_header, 7, upper_pdu->dst); mesh_lower_transport_send_pdu((mesh_pdu_t*) message_pdu); } static void mesh_upper_transport_send_upper_unsegmented_pdu(mesh_upper_transport_pdu_t * upper_pdu){ // TODO: store upper pdu in outgoing pdus active or similar outgoing_upper_transport_pdu = upper_pdu; mesh_unsegmented_pdu_t * unsegmented_pdu = &outgoing_unsegmented_pdu_singleton; unsegmented_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_UNSEGMENTED; // provide segment mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); btstack_assert(network_pdu); unsegmented_pdu->segment = network_pdu; // setup network pdu network_pdu->data[0] = upper_pdu->ivi_nid; network_pdu->data[1] = upper_pdu->ctl_ttl; big_endian_store_24(network_pdu->data, 2, upper_pdu->seq); big_endian_store_16(network_pdu->data, 5, upper_pdu->src); big_endian_store_16(network_pdu->data, 7, upper_pdu->dst); network_pdu->netkey_index = upper_pdu->netkey_index; // setup acess message network_pdu->data[9] = upper_pdu->akf_aid_control; btstack_assert(upper_pdu->len < 15); (void)memcpy(&network_pdu->data[10], crypto_buffer, upper_pdu->len); network_pdu->len = 10 + upper_pdu->len; network_pdu->flags = 0; mesh_lower_transport_send_pdu((mesh_pdu_t*) unsegmented_pdu); } static void mesh_upper_transport_send_upper_segmented_access_pdu_ccm(void * arg){ crypto_active = 0; mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; mesh_print_hex("EncAccessPayload", crypto_buffer, upper_pdu->len); // store TransMIC btstack_crypto_ccm_get_authentication_value(&ccm, &crypto_buffer[upper_pdu->len]); mesh_print_hex("TransMIC", &crypto_buffer[upper_pdu->len], upper_pdu->transmic_len); upper_pdu->len += upper_pdu->transmic_len; mesh_print_hex("UpperTransportPDU", crypto_buffer, upper_pdu->len); switch (upper_pdu->pdu_header.pdu_type){ case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: mesh_upper_transport_send_upper_unsegmented_pdu(upper_pdu); break; case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: mesh_upper_transport_send_upper_segmented_pdu(upper_pdu); break; default: btstack_assert(false); } } static void mesh_upper_transport_send_upper_segmented_access_pdu_digest(void *arg){ mesh_upper_transport_pdu_t * upper_pdu = (mesh_upper_transport_pdu_t *) arg; uint16_t access_pdu_len = upper_pdu->len; btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, crypto_buffer, crypto_buffer, &mesh_upper_transport_send_upper_segmented_access_pdu_ccm, upper_pdu); } static void mesh_upper_transport_send_upper_segmented_access_pdu(mesh_upper_transport_pdu_t * upper_pdu){ // if dst is virtual address, lookup label uuid and hash uint16_t aad_len = 0; mesh_virtual_address_t * virtual_address = NULL; if (mesh_network_address_virtual(upper_pdu->dst)){ virtual_address = mesh_virtual_address_for_pseudo_dst(upper_pdu->dst); if (!virtual_address){ printf("No virtual address register for pseudo dst %4x\n", upper_pdu->dst); mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); return; } // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); // printf_hexdump(virtual_address->label_uuid, 16); aad_len = 16; upper_pdu->dst = virtual_address->hash; } // get app or device key uint16_t appkey_index = upper_pdu->appkey_index; const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(upper_pdu->netkey_index, appkey_index); if (appkey == NULL){ printf("AppKey %04x not found, drop message\n", appkey_index); mesh_access_message_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_FAILED, (mesh_pdu_t *) upper_pdu); return; } // reserve slot mesh_lower_transport_reserve_slot(); // reserve one sequence number, which is also used to encrypt access payload uint32_t seq = mesh_sequence_number_next(); upper_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; upper_pdu->seq = seq; // also reserves crypto_buffer crypto_active = 1; // flatten segmented pdu into crypto buffer uint16_t payload_len = mesh_upper_pdu_flatten(upper_pdu, crypto_buffer, sizeof(crypto_buffer)); btstack_assert(payload_len == upper_pdu->len); // Dump PDU printf("[+] Upper transport, send upper (un)segmented Access PDU - dest %04x, seq %06x\n", upper_pdu->dst, upper_pdu->seq); mesh_print_hex("Access Payload", crypto_buffer, upper_pdu->len); // setup nonce - uses dst, so after pseudo address translation if (appkey_index == MESH_DEVICE_KEY_INDEX){ transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); } else { transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) upper_pdu); } // Dump key mesh_print_hex("AppOrDevKey", appkey->key, 16); // encrypt ccm uint8_t transmic_len = upper_pdu->transmic_len; uint16_t access_pdu_len = upper_pdu->len; btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); if (virtual_address){ mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, &mesh_upper_transport_send_upper_segmented_access_pdu_digest, upper_pdu); } else { mesh_upper_transport_send_upper_segmented_access_pdu_digest(upper_pdu); } } static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ // reserve slot mesh_lower_transport_reserve_slot(); // reserve sequence number uint32_t seq = mesh_sequence_number_next(); mesh_network_pdu_set_seq(network_pdu, seq); // Dump PDU uint8_t opcode = network_pdu->data[9]; printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); // wrap into mesh-unsegmented-pdu outgoing_unsegmented_pdu_singleton.pdu_header.pdu_type = MESH_PDU_TYPE_UNSEGMENTED; outgoing_unsegmented_pdu_singleton.segment = network_pdu; outgoing_unsegmented_pdu_singleton.flags = MESH_TRANSPORT_FLAG_CONTROL; // send mesh_lower_transport_send_pdu((mesh_pdu_t *) &outgoing_unsegmented_pdu_singleton); } #if 0 static void mesh_upper_transport_send_segmented_control_pdu(mesh_transport_pdu_t * transport_pdu){ // reserve slot mesh_lower_transport_reserve_slot(); // reserve sequence number uint32_t seq = mesh_sequence_number_next(); transport_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; mesh_transport_set_seq(transport_pdu, seq); // Dump PDU uint8_t opcode = transport_pdu->data[0]; printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", transport_pdu, seq, opcode); mesh_print_hex("Access Payload", &transport_pdu->data[1], transport_pdu->len - 1); // send btstack_assert(false); // mesh_upper_transport_send_segmented_pdu(transport_pdu); } #endif static void mesh_upper_transport_run(void){ while(!btstack_linked_list_empty(&upper_transport_incoming)){ if (crypto_active) return; // get next message mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(&upper_transport_incoming); mesh_network_pdu_t * network_pdu; mesh_segmented_pdu_t * message_pdu; mesh_unsegmented_pdu_t * unsegmented_pdu; switch (pdu->pdu_type){ case MESH_PDU_TYPE_UNSEGMENTED: unsegmented_pdu = (mesh_unsegmented_pdu_t *) pdu; network_pdu = unsegmented_pdu->segment; btstack_assert(network_pdu != NULL); // control? if (mesh_network_control(network_pdu)) { incoming_control_pdu = &incoming_control_pdu_singleton; incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; incoming_control_pdu->len = network_pdu->len; incoming_control_pdu->netkey_index = network_pdu->netkey_index; uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); incoming_control_pdu->akf_aid_control = lower_transport_pdu[0]; incoming_control_pdu->len = network_pdu->len - 10; // 9 header + 1 opcode (void)memcpy(incoming_control_pdu->data, &lower_transport_pdu[1], incoming_control_pdu->len); // copy meta data into encrypted pdu buffer (void)memcpy(incoming_control_pdu->network_header, network_pdu->data, 9); mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); // free mesh message mesh_lower_transport_message_processed_by_higher_layer(pdu); btstack_assert(mesh_control_message_handler != NULL); mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); } else { incoming_access_pdu_encrypted = &incoming_access_pdu_encrypted_singleton; incoming_access_pdu_encrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; incoming_access_pdu_decrypted = &incoming_access_pdu_decrypted_singleton; incoming_access_pdu_encrypted->netkey_index = network_pdu->netkey_index; incoming_access_pdu_encrypted->transmic_len = 4; uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); incoming_access_pdu_encrypted->akf_aid_control = lower_transport_pdu[0]; incoming_access_pdu_encrypted->len = network_pdu->len - 10; // 9 header + 1 AID (void)memcpy(incoming_access_pdu_encrypted->data, &lower_transport_pdu[1], incoming_access_pdu_encrypted->len); // copy meta data into encrypted pdu buffer (void)memcpy(incoming_access_pdu_encrypted->network_header, network_pdu->data, 9); mesh_print_hex("Assembled payload", incoming_access_pdu_encrypted->data, incoming_access_pdu_encrypted->len); // free mesh message mesh_lower_transport_message_processed_by_higher_layer(pdu); // get encoded transport pdu and start processing mesh_upper_transport_process_segmented_message(); } break; case MESH_PDU_TYPE_SEGMENTED: message_pdu = (mesh_segmented_pdu_t *) pdu; uint8_t ctl = mesh_message_ctl(message_pdu); if (ctl){ incoming_control_pdu= &incoming_control_pdu_singleton; incoming_control_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_CONTROL; // flatten mesh_segmented_pdu_flatten(&message_pdu->segments, 8, incoming_control_pdu->data); // copy meta data into encrypted pdu buffer incoming_control_pdu->len = message_pdu->len; incoming_control_pdu->netkey_index = message_pdu->netkey_index; incoming_control_pdu->akf_aid_control = message_pdu->akf_aid_control; incoming_control_pdu->flags = 0; (void)memcpy(incoming_control_pdu->network_header, message_pdu->network_header, 9); mesh_print_hex("Assembled payload", incoming_control_pdu->data, incoming_control_pdu->len); // free mesh message mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); btstack_assert(mesh_control_message_handler != NULL); mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_control_pdu; mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); } else { incoming_access_pdu_encrypted = &incoming_access_pdu_encrypted_singleton; incoming_access_pdu_encrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; incoming_access_pdu_decrypted = &incoming_access_pdu_decrypted_singleton; // flatten mesh_segmented_pdu_flatten(&message_pdu->segments, 12, incoming_access_pdu_encrypted->data); // copy meta data into encrypted pdu buffer incoming_access_pdu_encrypted->len = message_pdu->len; incoming_access_pdu_encrypted->netkey_index = message_pdu->netkey_index; incoming_access_pdu_encrypted->transmic_len = message_pdu->transmic_len; incoming_access_pdu_encrypted->akf_aid_control = message_pdu->akf_aid_control; (void)memcpy(incoming_access_pdu_encrypted->network_header, message_pdu->network_header, 9); mesh_print_hex("Assembled payload", incoming_access_pdu_encrypted->data, incoming_access_pdu_encrypted->len); // free mesh message mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); // get encoded transport pdu and start processing mesh_upper_transport_process_segmented_message(); } break; default: btstack_assert(0); break; } } while (!btstack_linked_list_empty(&upper_transport_outgoing)){ if (crypto_active) break; if (outgoing_segmented_access_pdu != NULL) break; mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_outgoing); if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == 0) break; (void) btstack_linked_list_pop(&upper_transport_outgoing); mesh_unsegmented_pdu_t * unsegmented_pdu; switch (pdu->pdu_type){ case MESH_PDU_TYPE_NETWORK: btstack_assert(mesh_pdu_ctl(pdu) != 0); mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); break; case MESH_PDU_TYPE_UNSEGMENTED: unsegmented_pdu = ( mesh_unsegmented_pdu_t *) pdu; btstack_assert((unsegmented_pdu->flags & MESH_TRANSPORT_FLAG_CONTROL) == 0); mesh_upper_transport_send_unsegmented_access_pdu(unsegmented_pdu); break; case MESH_PDU_TYPE_ACCESS: if (mesh_pdu_ctl(pdu) != 0){ btstack_assert(false); } else { mesh_upper_transport_send_segmented_access_pdu((mesh_access_pdu_t *) pdu); } break; case MESH_PDU_TYPE_UPPER_SEGMENTED_ACCESS: case MESH_PDU_TYPE_UPPER_UNSEGMENTED_ACCESS: mesh_upper_transport_send_upper_segmented_access_pdu((mesh_upper_transport_pdu_t *) pdu); break; default: btstack_assert(false); break; } } } static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ mesh_pdu_t * pdu_to_report; mesh_unsegmented_pdu_t * unsegmented_pdu; switch (callback_type){ case MESH_TRANSPORT_PDU_RECEIVED: mesh_upper_transport_message_received(pdu); break; case MESH_TRANSPORT_PDU_SENT: switch (pdu->pdu_type){ case MESH_PDU_TYPE_SEGMENTED: // free chunks while (!btstack_linked_list_empty(&outgoing_segmented_message_singleton.segments)){ mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&outgoing_segmented_message_singleton.segments); mesh_network_pdu_free(network_pdu); } // notify upper layer but use transport pdu pdu_to_report = (mesh_pdu_t *) outgoing_segmented_access_pdu; outgoing_segmented_access_pdu = NULL; if (mesh_pdu_ctl(pdu_to_report)){ mesh_control_message_handler(callback_type, status, pdu_to_report); } else { mesh_access_message_handler(callback_type, status, pdu_to_report); } break; case MESH_PDU_TYPE_UNSEGMENTED: unsegmented_pdu = (mesh_unsegmented_pdu_t *) pdu; if (unsegmented_pdu == &outgoing_unsegmented_pdu_singleton){ if ((unsegmented_pdu->flags & MESH_TRANSPORT_FLAG_CONTROL) == 0){ // notify upper layer but use network pdu (control pdu) mesh_network_pdu_t * network_pdu = outgoing_unsegmented_pdu_singleton.segment; outgoing_unsegmented_pdu_singleton.segment = NULL; mesh_control_message_handler(callback_type, status, (mesh_pdu_t *) network_pdu); } else { // notify upper layer but use upper access pdu mesh_network_pdu_t * network_pdu = outgoing_unsegmented_pdu_singleton.segment; outgoing_unsegmented_pdu_singleton.segment = NULL; mesh_network_pdu_free(network_pdu); pdu_to_report = (mesh_pdu_t *) outgoing_upper_transport_pdu; mesh_access_message_handler(callback_type, status, pdu_to_report); } } else { btstack_assert((unsegmented_pdu->flags & MESH_TRANSPORT_FLAG_CONTROL) == 0); mesh_access_message_handler(callback_type, status, pdu); } break; default: btstack_assert(false); break; } mesh_upper_transport_run(); break; default: break; } } void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ mesh_network_pdu_t * network_pdu; mesh_segmented_pdu_t * message_pdu; switch (pdu->pdu_type) { case MESH_PDU_TYPE_NETWORK: network_pdu = (mesh_network_pdu_t *) pdu; mesh_network_pdu_free(network_pdu); break; case MESH_PDU_TYPE_SEGMENTED: message_pdu = (mesh_segmented_pdu_t *) pdu; mesh_message_pdu_free(message_pdu); default: btstack_assert(false); break; } } void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ crypto_active = 0; switch (pdu->pdu_type){ case MESH_PDU_TYPE_ACCESS: mesh_upper_transport_process_access_message_done((mesh_access_pdu_t *) pdu); case MESH_PDU_TYPE_CONTROL: mesh_upper_transport_process_control_message_done((mesh_control_pdu_t *) pdu); break; default: btstack_assert(0); break; } } 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)) { mesh_access_message_handler = callback; } 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)){ mesh_control_message_handler = callback; } void mesh_upper_transport_init(){ mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); }