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btstack/test/mesh/mesh_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_transport.c"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ble/mesh/beacon.h"
#include "mesh_transport.h"
#include "btstack_util.h"
#include "btstack_memory.h"
#include "ble/mesh/mesh_lower_transport.h"
#include "mesh_peer.h"
#include "mesh_keys.h"
#include "mesh_virtual_addresses.h"
static uint16_t primary_element_address;
static void (*higher_layer_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu);
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);
// }
// 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
uint8_t akf;
uint8_t aid;
} mesh_transport_key_and_virtual_address_iterator_t;
static void mesh_transport_key_and_virtual_address_iterator_init(mesh_transport_key_and_virtual_address_iterator_t * it, uint16_t dst, uint8_t akf, uint8_t aid){
printf("KEY_INIT: dst %04x, akf %x, aid %x\n", dst, akf, aid);
// config
it->dst = dst;
it->aid = aid;
it->akf = akf;
// init elements
it->key = NULL;
it->address = NULL;
// init element iterators
mesh_transport_key_iterator_init(&it->key_it, 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_iterator_has_more(&it->key_it)) {
it->key = mesh_transport_key_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 (1){
if (mesh_virtual_address_iterator_has_more(&it->address_it)) return 1;
if (!mesh_transport_key_iterator_has_more(&it->key_it)) return 0;
// get next key
it->key = mesh_transport_key_iterator_get_next(&it->key_it);
mesh_virtual_address_iterator_init(&it->address_it, it->dst);
}
} else {
return mesh_transport_key_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_iterator_get_next(&it->key_it);
}
}
// UPPER TRANSPORT
// stub lower transport
static void mesh_upper_transport_validate_unsegmented_message(mesh_network_pdu_t * network_pdu);
static void mesh_upper_transport_validate_segmented_message(mesh_transport_pdu_t * transport_pdu);
static void mesh_transport_run(void);
static int crypto_active;
static mesh_network_pdu_t * network_pdu_in_validation;
static mesh_transport_pdu_t * transport_pdu_in_validation;
static uint8_t application_nonce[13];
static btstack_crypto_ccm_t ccm;
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_pdu_t * pdu);
static void (*mesh_control_message_handler)(mesh_pdu_t * pdu);
// unsegmented (network) and segmented (transport) control and access messages
static btstack_linked_list_t upper_transport_incoming;
void mesh_upper_unsegmented_control_message_received(mesh_network_pdu_t * network_pdu){
uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu);
uint8_t opcode = lower_transport_pdu[0];
if (mesh_control_message_handler){
mesh_control_message_handler((mesh_pdu_t*) network_pdu);
} else {
printf("[!] Unhandled Control message with opcode %02x\n", opcode);
// done
mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) network_pdu);
}
}
static void mesh_upper_transport_process_unsegmented_message_done(mesh_network_pdu_t *network_pdu){
crypto_active = 0;
if (mesh_network_control(network_pdu)) {
mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) network_pdu);
} else {
mesh_network_pdu_free(network_pdu);
mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) network_pdu_in_validation);
network_pdu_in_validation = NULL;
}
mesh_transport_run();
}
static void mesh_upper_transport_process_segmented_message_done(mesh_transport_pdu_t *transport_pdu){
crypto_active = 0;
if (mesh_transport_ctl(transport_pdu)) {
mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)transport_pdu);
} else {
mesh_transport_pdu_free(transport_pdu);
mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)transport_pdu_in_validation);
transport_pdu_in_validation = NULL;
}
mesh_transport_run();
}
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
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_transport_pdu_t * transport_pdu){
nonce[1] = transport_pdu->transmic_len == 8 ? 0x80 : 0x00;
memcpy(&nonce[2], &transport_pdu->network_header[2], 7);
big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(transport_pdu->network_header[0]));
}
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_transport_pdu_t * transport_pdu){
nonce[0] = 0x01;
transport_segmented_setup_nonce(nonce, transport_pdu);
mesh_print_hex("AppNonce", nonce, 13);
}
static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_transport_pdu_t * transport_pdu){
nonce[0] = 0x02;
transport_segmented_setup_nonce(nonce, transport_pdu);
mesh_print_hex("DeviceNonce", nonce, 13);
}
static void mesh_upper_transport_validate_unsegmented_message_ccm(void * arg){
mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) arg;
uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu);
uint8_t trans_mic_len = 4;
// store TransMIC
uint8_t trans_mic[8];
btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic);
mesh_print_hex("TransMIC", trans_mic, trans_mic_len);
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("Decryted PDU", upper_transport_pdu, upper_transport_pdu_len - trans_mic_len);
if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len - trans_mic_len], trans_mic_len) == 0){
printf("TransMIC matches\n");
// remove TransMIC from payload
network_pdu->len -= trans_mic_len;
// if virtual address, update dst to pseudo_dst
if (mesh_network_address_virtual(mesh_network_dst(network_pdu))){
big_endian_store_16(network_pdu->data, 7, mesh_transport_key_it.address->pseudo_dst);
}
// pass to upper layer
if (mesh_access_message_handler){
mesh_access_message_handler((mesh_pdu_t*) network_pdu);
} else {
printf("[!] Unhandled Unsegmented Access message\n");
// done
mesh_upper_transport_process_unsegmented_message_done(network_pdu);
}
printf("\n");
} else {
uint8_t afk = lower_transport_pdu[0] & 0x40;
if (afk){
printf("TransMIC does not match, try next key\n");
mesh_upper_transport_validate_unsegmented_message(network_pdu);
} else {
printf("TransMIC does not match device key, done\n");
// done
mesh_upper_transport_process_unsegmented_message_done(network_pdu);
}
}
}
static void mesh_upper_transport_validate_segmented_message_ccm(void * arg){
mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) arg;
uint8_t * upper_transport_pdu = transport_pdu->data;
uint8_t upper_transport_pdu_len = transport_pdu->len - transport_pdu->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, transport_pdu->transmic_len);
if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], transport_pdu->transmic_len) == 0){
printf("TransMIC matches\n");
// remove TransMIC from payload
transport_pdu->len -= transport_pdu->transmic_len;
// if virtual address, update dst to pseudo_dst
if (mesh_network_address_virtual(mesh_transport_dst(transport_pdu))){
big_endian_store_16(transport_pdu->network_header, 7, mesh_transport_key_it.address->pseudo_dst);
}
// pass to upper layer
if (mesh_access_message_handler){
mesh_access_message_handler((mesh_pdu_t*) transport_pdu);
} else {
printf("[!] Unhandled Segmented Access/Control message\n");
// done
mesh_upper_transport_process_segmented_message_done(transport_pdu);
}
printf("\n");
} else {
uint8_t akf = transport_pdu->akf_aid & 0x40;
if (akf){
printf("TransMIC does not match, try next key\n");
mesh_upper_transport_validate_segmented_message(transport_pdu);
} else {
printf("TransMIC does not match device key, done\n");
// done
mesh_upper_transport_process_segmented_message_done(transport_pdu);
}
}
}
void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){
crypto_active = 0;
switch (pdu->pdu_type){
case MESH_PDU_TYPE_NETWORK:
mesh_upper_transport_process_unsegmented_message_done((mesh_network_pdu_t *) pdu);
break;
case MESH_PDU_TYPE_TRANSPORT:
mesh_upper_transport_process_segmented_message_done((mesh_transport_pdu_t *) pdu);
break;
default:
break;
}
}
static void mesh_upper_transport_validate_segmented_message_digest(void * arg){
mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t*) arg;
uint8_t upper_transport_pdu_len = transport_pdu_in_validation->len - transport_pdu_in_validation->transmic_len;
uint8_t * upper_transport_pdu_data_in = transport_pdu_in_validation->data;
uint8_t * upper_transport_pdu_data_out = transport_pdu->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, transport_pdu);
}
static void mesh_upper_transport_validate_unsegmented_message_digest(void * arg){
mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) arg;
uint8_t trans_mic_len = 4;
uint8_t lower_transport_pdu_len = network_pdu_in_validation->len - 9;
uint8_t * upper_transport_pdu_data_in = &network_pdu_in_validation->data[10];
uint8_t * upper_transport_pdu_data_out = &network_pdu->data[10];
uint8_t upper_transport_pdu_len = lower_transport_pdu_len - 1 - trans_mic_len;
btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_in, upper_transport_pdu_data_out, &mesh_upper_transport_validate_unsegmented_message_ccm, network_pdu);
}
static void mesh_upper_transport_validate_unsegmented_message(mesh_network_pdu_t * network_pdu){
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_unsegmented_message_done(network_pdu);
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_unsegmented_setup_application_nonce(application_nonce, network_pdu_in_validation);
} else {
transport_unsegmented_setup_device_nonce(application_nonce, network_pdu_in_validation);
}
// store application / device key index
mesh_print_hex("AppOrDevKey", message_key->key, 16);
network_pdu->appkey_index = message_key->index;
// unsegmented message have TransMIC of 32 bit
uint8_t trans_mic_len = 4;
printf("Unsegmented Access message with TransMIC len 4\n");
uint8_t lower_transport_pdu_len = network_pdu_in_validation->len - 9;
uint8_t * upper_transport_pdu_data = &network_pdu_in_validation->data[10];
uint8_t upper_transport_pdu_len = lower_transport_pdu_len - 1 - trans_mic_len;
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_network_dst(network_pdu))){
aad_len = 16;
}
btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, trans_mic_len);
if (aad_len){
btstack_crypto_ccm_digest(&ccm, (uint8_t*) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_unsegmented_message_digest, network_pdu);
} else {
mesh_upper_transport_validate_unsegmented_message_digest(network_pdu);
}
}
static void mesh_upper_transport_validate_segmented_message(mesh_transport_pdu_t * transport_pdu){
uint8_t * upper_transport_pdu_data = transport_pdu->data;
uint8_t upper_transport_pdu_len = transport_pdu->len - transport_pdu->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_segmented_message_done(transport_pdu);
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, transport_pdu_in_validation);
} else {
transport_segmented_setup_device_nonce(application_nonce, transport_pdu_in_validation);
}
// store application / device key index
mesh_print_hex("AppOrDevKey", message_key->key, 16);
transport_pdu->appkey_index = message_key->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_transport_dst(transport_pdu))){
aad_len = 16;
}
btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, transport_pdu->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, transport_pdu);
} else {
mesh_upper_transport_validate_segmented_message_digest(transport_pdu);
}
}
static void mesh_upper_transport_process_unsegmented_access_message(mesh_network_pdu_t *network_pdu){
// copy original pdu
network_pdu->len = network_pdu_in_validation->len;
memcpy(network_pdu->data, network_pdu_in_validation->data, network_pdu->len);
//
uint8_t * lower_transport_pdu = &network_pdu_in_validation->data[9];
uint8_t lower_transport_pdu_len = network_pdu_in_validation->len - 9;
mesh_print_hex("Lower Transport network pdu", &network_pdu_in_validation->data[9], lower_transport_pdu_len);
uint8_t aid = lower_transport_pdu[0] & 0x3f;
uint8_t akf = (lower_transport_pdu[0] & 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_network_dst(network_pdu), akf, aid);
mesh_upper_transport_validate_unsegmented_message(network_pdu);
}
static void mesh_upper_transport_process_message(mesh_transport_pdu_t * transport_pdu){
// copy original pdu
transport_pdu->len = transport_pdu_in_validation->len;
memcpy(transport_pdu, transport_pdu_in_validation, sizeof(mesh_transport_pdu_t));
//
uint8_t * upper_transport_pdu = transport_pdu->data;
uint8_t upper_transport_pdu_len = transport_pdu->len - transport_pdu->transmic_len;
mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len);
uint8_t aid = transport_pdu->akf_aid & 0x3f;
uint8_t akf = (transport_pdu->akf_aid & 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_transport_dst(transport_pdu), akf, aid);
mesh_upper_transport_validate_segmented_message(transport_pdu);
}
void mesh_upper_transport_message_received(mesh_pdu_t * pdu){
btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu);
mesh_transport_run();
}
void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){
mesh_network_pdu_t * network_pdu;
mesh_transport_pdu_t * transport_pdu;
switch (callback_type){
case MESH_TRANSPORT_PDU_RECEIVED:
mesh_upper_transport_message_received(pdu);
break;
case MESH_TRANSPORT_PDU_SENT:
// notify upper layer (or just free pdu)
if (higher_layer_handler){
higher_layer_handler(callback_type, status, pdu);
} else {
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_TRANSPORT:
transport_pdu = (mesh_transport_pdu_t *) pdu;
mesh_transport_pdu_free(transport_pdu);
break;
default:
break;
}
}
break;
default:
break;
}
}
static void mesh_upper_transport_send_unsegmented_access_pdu_ccm(void * arg){
crypto_active = 0;
mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) arg;
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;
// send network pdu
mesh_lower_transport_send_pdu((mesh_pdu_t*) network_pdu);
}
static void mesh_upper_transport_send_segmented_access_pdu_ccm(void * arg){
crypto_active = 0;
mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) arg;
mesh_print_hex("EncAccessPayload", transport_pdu->data, transport_pdu->len);
// store TransMIC
btstack_crypto_ccm_get_authentication_value(&ccm, &transport_pdu->data[transport_pdu->len]);
mesh_print_hex("TransMIC", &transport_pdu->data[transport_pdu->len], transport_pdu->transmic_len);
transport_pdu->len += transport_pdu->transmic_len;
mesh_lower_transport_send_pdu((mesh_pdu_t*) transport_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){
printf("[+] Upper transport, setup unsegmented Control PDU (opcode %02x): \n", opcode);
printf_hexdump(control_pdu_data, 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;
memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len);
uint16_t transport_pdu_len = control_pdu_len + 1;
mesh_print_hex("LowerTransportPDU", transport_pdu_data, transport_pdu_len);
// setup network_pdu
mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, mesh_lower_transport_next_seq(), src, dest, transport_pdu_data, transport_pdu_len);
return 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){
printf("[+] Upper transport, setup segmented Control PDU (opcode %02x): \n", opcode);
printf_hexdump(control_pdu_data, 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;
uint32_t seq = mesh_lower_transport_peek_seq();
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 = opcode;
transport_pdu->transmic_len = 0; // no TransMIC for control
mesh_transport_set_nid_ivi(transport_pdu, network_key->nid);
mesh_transport_set_seq(transport_pdu, seq);
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;
}
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);
case MESH_PDU_TYPE_TRANSPORT:
return mesh_upper_transport_setup_segmented_control_pdu((mesh_transport_pdu_t *) pdu, netkey_index, ttl, src, dest, opcode, control_pdu_data, control_pdu_len);
default:
return 1;
}
}
static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu_header(mesh_network_pdu_t * network_pdu, uint16_t netkey_index,
uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest){
// 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;
network_pdu->data[9] = akf_aid;
// setup network_pdu
mesh_network_setup_pdu_header(network_pdu, netkey_index, network_key->nid, 0, ttl, mesh_lower_transport_next_seq(), src, dest);
network_pdu->appkey_index = appkey_index;
return 0;
}
static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu(mesh_network_pdu_t * network_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(network_pdu, netkey_index, appkey_index, ttl, src, dest);
if (status) return status;
printf("[+] Upper transport, setup unsegmented Access PDU - seq %06x\n", mesh_network_seq(network_pdu));
mesh_print_hex("Access Payload", access_pdu_data, access_pdu_len);
// store in transport pdu
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_transport_pdu_t * transport_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest,
uint8_t szmic){
uint32_t seq = mesh_lower_transport_peek_seq();
printf("[+] Upper transport, setup segmented Access PDU - seq %06x, szmic %u, iv_index %08x\n", seq, szmic,
mesh_get_iv_index());
mesh_print_hex("Access Payload", transport_pdu->data, transport_pdu->len);
// 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;
const uint8_t trans_mic_len = szmic ? 8 : 4;
// store in transport pdu
transport_pdu->transmic_len = trans_mic_len;
transport_pdu->netkey_index = netkey_index;
transport_pdu->appkey_index = appkey_index;
transport_pdu->akf_aid = akf_aid;
mesh_transport_set_nid_ivi(transport_pdu, network_key->nid | ((mesh_get_iv_index() & 1) << 7));
mesh_transport_set_seq(transport_pdu, seq);
mesh_transport_set_src(transport_pdu, src);
mesh_transport_set_dest(transport_pdu, dest);
mesh_transport_set_ctl_ttl(transport_pdu, ttl);
return 0;
}
static uint8_t mesh_upper_transport_setup_segmented_access_pdu(mesh_transport_pdu_t * transport_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(transport_pdu, netkey_index, appkey_index, ttl, src, dest, szmic);
if (status) return status;
// store in transport pdu
memcpy(transport_pdu->data, access_pdu_data, access_pdu_len);
transport_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_NETWORK:
mesh_upper_transport_setup_unsegmented_access_pdu_header((mesh_network_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest);
break;
case MESH_PDU_TYPE_TRANSPORT:
mesh_upper_transport_setup_segmented_access_pdu_header((mesh_transport_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic);
break;
default:
break;
}
}
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_NETWORK:
return mesh_upper_transport_setup_unsegmented_access_pdu((mesh_network_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, access_pdu_data, access_pdu_len);
case MESH_PDU_TYPE_TRANSPORT:
return mesh_upper_transport_setup_segmented_access_pdu((mesh_transport_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic, access_pdu_data, access_pdu_len);
default:
return 1;
}
}
void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){
mesh_lower_transport_send_pdu((mesh_pdu_t*) pdu);
}
static void mesh_upper_transport_send_unsegmented_access_pdu_digest(void * arg){
mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) arg;
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, network_pdu);
}
static void mesh_upper_transport_send_unsegmented_access_pdu(mesh_network_pdu_t * network_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_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);
}
// setup nonce
uint16_t appkey_index = network_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_transport_key_get(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, network_pdu);
} else {
mesh_upper_transport_send_unsegmented_access_pdu_digest(network_pdu);
}
}
static void mesh_upper_transport_send_segmented_access_pdu_digest(void *arg){
mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) arg;
uint16_t access_pdu_len = transport_pdu->len;
uint8_t * access_pdu_data = transport_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, transport_pdu);
}
static void mesh_upper_transport_send_segmented_access_pdu(mesh_transport_pdu_t * transport_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_transport_dst(transport_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_transport_pdu_free(transport_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(transport_pdu->network_header, 7, virtual_address->hash);
}
// setup nonce - uses dst, so after pseudo address translation
uint16_t appkey_index = transport_pdu->appkey_index;
if (appkey_index == MESH_DEVICE_KEY_INDEX){
transport_segmented_setup_device_nonce(application_nonce, transport_pdu);
} else {
transport_segmented_setup_application_nonce(application_nonce, transport_pdu);
}
// get app or device key
const mesh_transport_key_t * appkey = mesh_transport_key_get(appkey_index);
mesh_print_hex("AppOrDevKey", appkey->key, 16);
// encrypt ccm
uint8_t transmic_len = transport_pdu->transmic_len;
uint16_t access_pdu_len = transport_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, transport_pdu);
} else {
mesh_upper_transport_send_segmented_access_pdu_digest(transport_pdu);
}
}
void mesh_upper_transport_send_access_pdu(mesh_pdu_t * pdu){
switch (pdu->pdu_type){
case MESH_PDU_TYPE_NETWORK:
mesh_upper_transport_send_unsegmented_access_pdu((mesh_network_pdu_t *) pdu);
break;
case MESH_PDU_TYPE_TRANSPORT:
mesh_upper_transport_send_segmented_access_pdu((mesh_transport_pdu_t *) pdu);
break;
default:
break;
}
}
void mesh_upper_transport_set_primary_element_address(uint16_t unicast_address){
primary_element_address = unicast_address;
}
void mesh_upper_transport_register_access_message_handler(void (*callback)(mesh_pdu_t *pdu)){
mesh_access_message_handler = callback;
}
void mesh_upper_transport_register_control_message_handler(void (*callback)(mesh_pdu_t *pdu)){
mesh_control_message_handler = callback;
}
void mesh_upper_transport_set_higher_layer_handler(void (*pdu_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu)){
higher_layer_handler = pdu_handler;
}
void mesh_transport_init(){
mesh_lower_transport_init();
mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler);
}
static void mesh_transport_run(void){
while(!btstack_linked_list_empty(&upper_transport_incoming)){
if (crypto_active) return;
// peek at next message
mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_incoming);
mesh_transport_pdu_t * transport_pdu;
mesh_network_pdu_t * network_pdu;
switch (pdu->pdu_type){
case MESH_PDU_TYPE_NETWORK:
network_pdu = (mesh_network_pdu_t *) pdu;
// control?
if (mesh_network_control(network_pdu)) {
(void) btstack_linked_list_pop(&upper_transport_incoming);
mesh_upper_unsegmented_control_message_received(network_pdu);
} else {
mesh_network_pdu_t * decode_pdu = mesh_network_pdu_get();
if (!decode_pdu) return;
// get encoded network pdu and start processing
network_pdu_in_validation = network_pdu;
(void) btstack_linked_list_pop(&upper_transport_incoming);
mesh_upper_transport_process_unsegmented_access_message(decode_pdu);
}
break;
case MESH_PDU_TYPE_TRANSPORT:
transport_pdu = (mesh_transport_pdu_t *) pdu;
uint8_t ctl = mesh_transport_ctl(transport_pdu);
if (ctl){
printf("Ignoring Segmented Control Message\n");
(void) btstack_linked_list_pop(&upper_transport_incoming);
mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) transport_pdu);
} else {
mesh_transport_pdu_t * decode_pdu = mesh_transport_pdu_get();
if (!decode_pdu) return;
// get encoded transport pdu and start processing
transport_pdu_in_validation = transport_pdu;
(void) btstack_linked_list_pop(&upper_transport_incoming);
mesh_upper_transport_process_message(decode_pdu);
}
break;
default:
break;
}
}
}
// buffer pool
mesh_transport_pdu_t * mesh_transport_pdu_get(void){
mesh_transport_pdu_t * transport_pdu = btstack_memory_mesh_transport_pdu_get();
if (transport_pdu) {
memset(transport_pdu, 0, sizeof(mesh_transport_pdu_t));
transport_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_TRANSPORT;
}
return transport_pdu;
}
void mesh_transport_pdu_free(mesh_transport_pdu_t * transport_pdu){
btstack_memory_mesh_transport_pdu_free(transport_pdu);
}
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