/******************************************************************************
*
* Copyright 2014 Google, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
#define LOG_TAG "bt_hci"
#include "hci_packet_parser.h"
#include <base/logging.h>
#include "buffer_allocator.h"
#include "hci_layer.h"
#include "hcimsgs.h"
#include "osi/include/log.h"
static const command_opcode_t NO_OPCODE_CHECKING = 0;
static const allocator_t* buffer_allocator;
static uint8_t* read_command_complete_header(BT_HDR* response,
command_opcode_t expected_opcode,
size_t minimum_bytes_after);
static void parse_generic_command_complete(BT_HDR* response) {
read_command_complete_header(response, NO_OPCODE_CHECKING,
0 /* bytes after */);
buffer_allocator->free(response);
}
static void parse_read_buffer_size_response(BT_HDR* response,
uint16_t* data_size_ptr,
uint16_t* acl_buffer_count_ptr) {
uint8_t* stream = read_command_complete_header(response, HCI_READ_BUFFER_SIZE,
5 /* bytes after */);
CHECK(stream != NULL);
STREAM_TO_UINT16(*data_size_ptr, stream);
STREAM_SKIP_UINT8(stream); // skip the sco packet length
STREAM_TO_UINT16(*acl_buffer_count_ptr, stream);
buffer_allocator->free(response);
}
static void parse_read_local_version_info_response(BT_HDR* response,
bt_version_t* bt_version) {
uint8_t* stream = read_command_complete_header(
response, HCI_READ_LOCAL_VERSION_INFO, 8 /* bytes after */);
CHECK(stream != NULL);
STREAM_TO_UINT8(bt_version->hci_version, stream);
STREAM_TO_UINT16(bt_version->hci_revision, stream);
STREAM_TO_UINT8(bt_version->lmp_version, stream);
STREAM_TO_UINT16(bt_version->manufacturer, stream);
STREAM_TO_UINT16(bt_version->lmp_subversion, stream);
buffer_allocator->free(response);
}
static void parse_read_local_supported_codecs_response(
BT_HDR* response, uint8_t* number_of_local_supported_codecs,
uint8_t* local_supported_codecs) {
uint8_t* stream = read_command_complete_header(
response, HCI_READ_LOCAL_SUPPORTED_CODECS, 0 /* bytes after */);
if (stream) {
STREAM_TO_UINT8(*number_of_local_supported_codecs, stream);
for (uint8_t i = 0; i < *number_of_local_supported_codecs; i++) {
STREAM_TO_UINT8(*local_supported_codecs, stream);
local_supported_codecs++;
}
}
buffer_allocator->free(response);
}
static void parse_read_bd_addr_response(BT_HDR* response,
RawAddress* address_ptr) {
uint8_t* stream = read_command_complete_header(
response, HCI_READ_BD_ADDR, RawAddress::kLength /* bytes after */);
CHECK(stream != NULL);
STREAM_TO_BDADDR(*address_ptr, stream);
buffer_allocator->free(response);
}
static void parse_read_local_supported_commands_response(
BT_HDR* response, uint8_t* supported_commands_ptr,
size_t supported_commands_length) {
uint8_t* stream =
read_command_complete_header(response, HCI_READ_LOCAL_SUPPORTED_CMDS,
supported_commands_length /* bytes after */);
CHECK(stream != NULL);
STREAM_TO_ARRAY(supported_commands_ptr, stream,
(int)supported_commands_length);
buffer_allocator->free(response);
}
static void parse_read_local_extended_features_response(
BT_HDR* response, uint8_t* page_number_ptr, uint8_t* max_page_number_ptr,
bt_device_features_t* feature_pages, size_t feature_pages_count) {
uint8_t* stream = read_command_complete_header(
response, HCI_READ_LOCAL_EXT_FEATURES,
2 + sizeof(bt_device_features_t) /* bytes after */);
CHECK(stream != NULL);
STREAM_TO_UINT8(*page_number_ptr, stream);
STREAM_TO_UINT8(*max_page_number_ptr, stream);
CHECK(*page_number_ptr < feature_pages_count);
STREAM_TO_ARRAY(feature_pages[*page_number_ptr].as_array, stream,
(int)sizeof(bt_device_features_t));
buffer_allocator->free(response);
}
static void parse_ble_read_white_list_size_response(
BT_HDR* response, uint8_t* white_list_size_ptr) {
uint8_t* stream = read_command_complete_header(
response, HCI_BLE_READ_WHITE_LIST_SIZE, 1 /* byte after */);
CHECK(stream != NULL);
STREAM_TO_UINT8(*white_list_size_ptr, stream);
buffer_allocator->free(response);
}
static void parse_ble_read_buffer_size_response(BT_HDR* response,
uint16_t* data_size_ptr,
uint8_t* acl_buffer_count_ptr) {
uint8_t* stream = read_command_complete_header(
response, HCI_BLE_READ_BUFFER_SIZE, 3 /* bytes after */);
CHECK(stream != NULL);
STREAM_TO_UINT16(*data_size_ptr, stream);
STREAM_TO_UINT8(*acl_buffer_count_ptr, stream);
buffer_allocator->free(response);
}
static void parse_ble_read_supported_states_response(
BT_HDR* response, uint8_t* supported_states, size_t supported_states_size) {
uint8_t* stream =
read_command_complete_header(response, HCI_BLE_READ_SUPPORTED_STATES,
supported_states_size /* bytes after */);
CHECK(stream != NULL);
STREAM_TO_ARRAY(supported_states, stream, (int)supported_states_size);
buffer_allocator->free(response);
}
static void parse_ble_read_local_supported_features_response(
BT_HDR* response, bt_device_features_t* supported_features) {
uint8_t* stream = read_command_complete_header(
response, HCI_BLE_READ_LOCAL_SPT_FEAT,
sizeof(bt_device_features_t) /* bytes after */);
CHECK(stream != NULL);
STREAM_TO_ARRAY(supported_features->as_array, stream,
(int)sizeof(bt_device_features_t));
buffer_allocator->free(response);
}
static void parse_ble_read_resolving_list_size_response(
BT_HDR* response, uint8_t* resolving_list_size_ptr) {
uint8_t* stream = read_command_complete_header(
response, HCI_BLE_READ_RESOLVING_LIST_SIZE, 1 /* bytes after */);
STREAM_TO_UINT8(*resolving_list_size_ptr, stream);
buffer_allocator->free(response);
}
static void parse_ble_read_suggested_default_data_length_response(
BT_HDR* response, uint16_t* ble_default_packet_length_ptr) {
uint8_t* stream = read_command_complete_header(
response, HCI_BLE_READ_DEFAULT_DATA_LENGTH, 2 /* bytes after */);
STREAM_TO_UINT16(*ble_default_packet_length_ptr, stream);
buffer_allocator->free(response);
}
static void parse_ble_read_maximum_data_length_response(
BT_HDR* response, uint16_t* ble_supported_max_tx_octets,
uint16_t* ble_supported_max_tx_time, uint16_t* ble_supported_max_rx_octets,
uint16_t* ble_supported_max_rx_time) {
uint8_t* stream = read_command_complete_header(
response, HCI_BLE_READ_MAXIMUM_DATA_LENGTH, 8 /* bytes after */);
STREAM_TO_UINT16(*ble_supported_max_tx_octets, stream);
STREAM_TO_UINT16(*ble_supported_max_tx_time, stream);
STREAM_TO_UINT16(*ble_supported_max_rx_octets, stream);
STREAM_TO_UINT16(*ble_supported_max_rx_time, stream);
buffer_allocator->free(response);
}
static void parse_ble_read_maximum_advertising_data_length(
BT_HDR* response, uint16_t* ble_maximum_advertising_data_length_ptr) {
uint8_t* stream = read_command_complete_header(
response, HCI_LE_READ_MAXIMUM_ADVERTISING_DATA_LENGTH,
2 /* bytes after */);
STREAM_TO_UINT16(*ble_maximum_advertising_data_length_ptr, stream);
buffer_allocator->free(response);
}
static void parse_ble_read_number_of_supported_advertising_sets(
BT_HDR* response, uint8_t* ble_number_of_supported_advertising_sets_ptr) {
uint8_t* stream = read_command_complete_header(
response, HCI_LE_READ_NUMBER_OF_SUPPORTED_ADVERTISING_SETS,
1 /* bytes after */);
STREAM_TO_UINT8(*ble_number_of_supported_advertising_sets_ptr, stream);
buffer_allocator->free(response);
}
// Internal functions
static uint8_t* read_command_complete_header(BT_HDR* response,
command_opcode_t expected_opcode,
size_t minimum_bytes_after) {
uint8_t* stream = response->data + response->offset;
// Read the event header
uint8_t event_code;
uint8_t parameter_length;
STREAM_TO_UINT8(event_code, stream);
STREAM_TO_UINT8(parameter_length, stream);
const size_t parameter_bytes_we_read_here = 4;
// Check the event header values against what we expect
CHECK(event_code == HCI_COMMAND_COMPLETE_EVT);
CHECK(parameter_length >=
(parameter_bytes_we_read_here + minimum_bytes_after));
// Read the command complete header
command_opcode_t opcode;
uint8_t status;
STREAM_SKIP_UINT8(stream); // skip the number of hci command packets field
STREAM_TO_UINT16(opcode, stream);
// Check the command complete header values against what we expect
if (expected_opcode != NO_OPCODE_CHECKING) {
CHECK(opcode == expected_opcode);
}
// Assume the next field is the status field
STREAM_TO_UINT8(status, stream);
if (status != HCI_SUCCESS) {
LOG_ERROR(LOG_TAG, "%s: return status - 0x%x", __func__, status);
return NULL;
}
return stream;
}
static const hci_packet_parser_t interface = {
parse_generic_command_complete,
parse_read_buffer_size_response,
parse_read_local_version_info_response,
parse_read_bd_addr_response,
parse_read_local_supported_commands_response,
parse_read_local_extended_features_response,
parse_ble_read_white_list_size_response,
parse_ble_read_buffer_size_response,
parse_ble_read_supported_states_response,
parse_ble_read_local_supported_features_response,
parse_ble_read_resolving_list_size_response,
parse_ble_read_suggested_default_data_length_response,
parse_ble_read_maximum_data_length_response,
parse_ble_read_maximum_advertising_data_length,
parse_ble_read_number_of_supported_advertising_sets,
parse_read_local_supported_codecs_response};
const hci_packet_parser_t* hci_packet_parser_get_interface() {
buffer_allocator = buffer_allocator_get_interface();
return &interface;
}
const hci_packet_parser_t* hci_packet_parser_get_test_interface(
allocator_t* buffer_allocator_interface) {
buffer_allocator = buffer_allocator_interface;
return &interface;
}