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btstack/src/mesh/mesh_upper_transport.c

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/*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#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);
}
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