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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"
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
} 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, 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 (1){
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
// stub lower transport
static void mesh_upper_transport_validate_unsegmented_message(void);
static void mesh_upper_transport_validate_segmented_message(void);
static void mesh_upper_transport_run(void);
static int crypto_active;
static mesh_network_pdu_t * incoming_network_pdu_raw;
static mesh_network_pdu_t * incoming_network_pdu_decoded;
static mesh_transport_pdu_t * incoming_transport_pdu_raw;
static mesh_transport_pdu_t * incoming_transport_pdu_decoded;
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);
// 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;
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_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(list);
switch (pdu->pdu_type){
case MESH_PDU_TYPE_NETWORK:
btstack_memory_mesh_network_pdu_free((mesh_network_pdu_t *) pdu);
break;
case MESH_PDU_TYPE_TRANSPORT:
btstack_memory_mesh_transport_pdu_free((mesh_transport_pdu_t *) pdu);
break;
default:
break;
}
}
}
void mesh_upper_transport_dump(void){
printf("incoming_network_pdu_raw: %p\n", incoming_network_pdu_raw);
printf("incoming_network_pdu_decoded: %p\n", incoming_network_pdu_decoded);
mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming);
}
void mesh_upper_transport_reset(void){
crypto_active = 0;
if (incoming_network_pdu_raw){
mesh_network_pdu_free(incoming_network_pdu_raw);
incoming_network_pdu_raw = NULL;
}
// if (incoming_network_pdu_decoded){
// mesh_network_pdu_free(incoming_network_pdu_decoded);
// incoming_network_pdu_decoded = NULL;
// }
mesh_upper_transport_reset_pdus(&upper_transport_incoming);
}
static 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 *) incoming_network_pdu_raw);
incoming_network_pdu_raw = NULL;
}
mesh_upper_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 *)incoming_transport_pdu_raw);
incoming_transport_pdu_raw = NULL;
}
mesh_upper_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){
UNUSED(arg);
uint8_t * lower_transport_pdu = mesh_network_pdu_data(incoming_network_pdu_decoded);
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(incoming_network_pdu_decoded) + 1;
uint8_t upper_transport_pdu_len = mesh_network_pdu_len(incoming_network_pdu_decoded) - 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
incoming_network_pdu_decoded->len -= trans_mic_len;
// if virtual address, update dst to pseudo_dst
if (mesh_network_address_virtual(mesh_network_dst(incoming_network_pdu_decoded))){
big_endian_store_16(incoming_network_pdu_decoded->data, 7, mesh_transport_key_it.address->pseudo_dst);
}
// pass to upper layer
if (mesh_access_message_handler){
mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_network_pdu_decoded;
incoming_network_pdu_decoded = NULL;
mesh_access_message_handler(pdu);
} else {
printf("[!] Unhandled Unsegmented Access message\n");
// done
mesh_upper_transport_process_unsegmented_message_done(incoming_network_pdu_decoded);
}
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();
} else {
printf("TransMIC does not match device key, done\n");
// done
mesh_upper_transport_process_unsegmented_message_done(incoming_network_pdu_decoded);
}
}
}
static void mesh_upper_transport_validate_segmented_message_ccm(void * arg){
UNUSED(arg);
uint8_t * upper_transport_pdu = incoming_transport_pdu_decoded->data;
uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->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_transport_pdu_decoded->transmic_len);
if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], incoming_transport_pdu_decoded->transmic_len) == 0){
printf("TransMIC matches\n");
// remove TransMIC from payload
incoming_transport_pdu_decoded->len -= incoming_transport_pdu_decoded->transmic_len;
// if virtual address, update dst to pseudo_dst
if (mesh_network_address_virtual(mesh_transport_dst(incoming_transport_pdu_decoded))){
big_endian_store_16(incoming_transport_pdu_decoded->network_header, 7, mesh_transport_key_it.address->pseudo_dst);
}
// pass to upper layer
if (mesh_access_message_handler){
mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_transport_pdu_decoded;
incoming_network_pdu_decoded = NULL;
mesh_access_message_handler(pdu);
} else {
printf("[!] Unhandled Segmented Access/Control message\n");
// done
mesh_upper_transport_process_segmented_message_done(incoming_transport_pdu_decoded);
}
printf("\n");
} else {
uint8_t akf = incoming_transport_pdu_decoded->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_segmented_message_done(incoming_transport_pdu_decoded);
}
}
}
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){
UNUSED(arg);
uint8_t upper_transport_pdu_len = incoming_transport_pdu_raw->len - incoming_transport_pdu_raw->transmic_len;
uint8_t * upper_transport_pdu_data_in = incoming_transport_pdu_raw->data;
uint8_t * upper_transport_pdu_data_out = incoming_transport_pdu_decoded->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_unsegmented_message_digest(void * arg){
UNUSED(arg);
uint8_t trans_mic_len = 4;
uint8_t lower_transport_pdu_len = incoming_network_pdu_raw->len - 9;
uint8_t * upper_transport_pdu_data_in = &incoming_network_pdu_raw->data[10];
uint8_t * upper_transport_pdu_data_out = &incoming_network_pdu_decoded->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, NULL);
}
static void mesh_upper_transport_validate_unsegmented_message(void){
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(incoming_network_pdu_decoded);
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, incoming_network_pdu_raw);
} else {
transport_unsegmented_setup_device_nonce(application_nonce, incoming_network_pdu_raw);
}
// store application / device key index
mesh_print_hex("AppOrDevKey", message_key->key, 16);
incoming_network_pdu_decoded->appkey_index = message_key->appkey_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 = incoming_network_pdu_raw->len - 9;
uint8_t * upper_transport_pdu_data = &incoming_network_pdu_raw->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(incoming_network_pdu_decoded))){
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, NULL);
} else {
mesh_upper_transport_validate_unsegmented_message_digest(incoming_network_pdu_decoded);
}
}
static void mesh_upper_transport_validate_segmented_message(void){
uint8_t * upper_transport_pdu_data = incoming_transport_pdu_decoded->data;
uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->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(incoming_transport_pdu_decoded);
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, incoming_transport_pdu_raw);
} else {
transport_segmented_setup_device_nonce(application_nonce, incoming_transport_pdu_raw);
}
// store application / device key index
mesh_print_hex("AppOrDevKey", message_key->key, 16);
incoming_transport_pdu_decoded->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_transport_dst(incoming_transport_pdu_decoded))){
aad_len = 16;
}
btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, incoming_transport_pdu_decoded->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_unsegmented_access_message(void){
// copy original pdu
incoming_network_pdu_decoded->len = incoming_network_pdu_raw->len;
memcpy(incoming_network_pdu_decoded->data, incoming_network_pdu_raw->data, incoming_network_pdu_decoded->len);
//
uint8_t * lower_transport_pdu = &incoming_network_pdu_raw->data[9];
uint8_t lower_transport_pdu_len = incoming_network_pdu_raw->len - 9;
mesh_print_hex("Lower Transport network pdu", &incoming_network_pdu_raw->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(incoming_network_pdu_decoded),
incoming_network_pdu_decoded->netkey_index, akf, aid);
mesh_upper_transport_validate_unsegmented_message();
}
static void mesh_upper_transport_process_message(void){
// copy original pdu
memcpy(incoming_transport_pdu_decoded, incoming_transport_pdu_raw, sizeof(mesh_transport_pdu_t));
//
uint8_t * upper_transport_pdu = incoming_transport_pdu_decoded->data;
uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->transmic_len;
mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len);
uint8_t aid = incoming_transport_pdu_decoded->akf_aid_control & 0x3f;
uint8_t akf = (incoming_transport_pdu_decoded->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_transport_dst(incoming_transport_pdu_decoded),
incoming_transport_pdu_decoded->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();
}
void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){
mesh_network_pdu_t * network_pdu;
mesh_transport_pdu_t * transport_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_TRANSPORT:
transport_pdu = (mesh_transport_pdu_t *) pdu;
mesh_transport_pdu_free(transport_pdu);
break;
default:
break;
}
}
static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * 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 {
mesh_upper_transport_pdu_free(pdu);
}
mesh_upper_transport_run();
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;
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*) 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_print_hex("UpperTransportPDU", transport_pdu->data, transport_pdu->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){
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;
// 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;
}
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;
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;
}
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, 0, 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;
// 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){
// 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
transport_pdu->transmic_len = trans_mic_len;
transport_pdu->netkey_index = netkey_index;
transport_pdu->appkey_index = appkey_index;
transport_pdu->akf_aid_control = akf_aid;
mesh_transport_set_nid_ivi(transport_pdu, network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7));
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:
return mesh_upper_transport_setup_unsegmented_access_pdu_header((mesh_network_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest);
case MESH_PDU_TYPE_TRANSPORT:
return mesh_upper_transport_setup_segmented_access_pdu_header((mesh_transport_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic);
default:
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_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;
}
}
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 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_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);
}
// 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 = 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_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, 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);
}
// get app or device key
uint16_t appkey_index = transport_pdu->appkey_index;
const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(transport_pdu->netkey_index, appkey_index);
if (appkey == NULL){
printf("AppKey %04x not found, drop message\n", appkey_index);
btstack_memory_mesh_transport_pdu_free(transport_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();
transport_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED;
mesh_transport_set_seq(transport_pdu, seq);
// Dump PDU
printf("[+] Upper transport, send segmented Access PDU - dest %04x, seq %06x\n", dst, mesh_transport_seq(transport_pdu));
mesh_print_hex("Access Payload", transport_pdu->data, transport_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, transport_pdu);
} else {
transport_segmented_setup_application_nonce(application_nonce, transport_pdu);
}
// Dump key
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);
}
}
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);
// send
mesh_lower_transport_send_pdu((mesh_pdu_t *) network_pdu);
}
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
mesh_lower_transport_send_pdu((mesh_pdu_t *) transport_pdu);
}
static void mesh_upper_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 {
incoming_network_pdu_decoded = mesh_network_pdu_get();
if (!incoming_network_pdu_decoded) return;
// get encoded network pdu and start processing
incoming_network_pdu_raw = network_pdu;
(void) btstack_linked_list_pop(&upper_transport_incoming);
mesh_upper_transport_process_unsegmented_access_message();
}
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 {
incoming_transport_pdu_decoded = mesh_transport_pdu_get();
if (!incoming_transport_pdu_decoded) return;
// get encoded transport pdu and start processing
incoming_transport_pdu_raw = transport_pdu;
(void) btstack_linked_list_pop(&upper_transport_incoming);
mesh_upper_transport_process_message();
}
break;
default:
break;
}
}
while (!btstack_linked_list_empty(&upper_transport_outgoing)){
if (crypto_active) 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);
if (mesh_pdu_ctl(pdu)){
switch (pdu->pdu_type){
case MESH_PDU_TYPE_NETWORK:
mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu);
break;
case MESH_PDU_TYPE_TRANSPORT:
mesh_upper_transport_send_segmented_control_pdu((mesh_transport_pdu_t *) pdu);
break;
default:
break;
}
} else {
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_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_upper_transport_init(){
mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler);
}
// 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){
btstack_assert(pdu->ack_opcode != MESH_ACCESS_OPCODE_NOT_SET);
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();
}
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();
}
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