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/*
* Copyright 2021 The Android Open Source Project
*
* 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.
*/
#include "btaa/hci_processor.h"
#include "os/log.h"
namespace bluetooth {
namespace activity_attribution {
void DeviceParser::match_handle_with_address(uint16_t connection_handle, hci::Address& address) {
if (connection_handle && !address.IsEmpty()) {
connection_lookup_table_[connection_handle] = address;
} else if (connection_handle) {
if (connection_lookup_table_.find(connection_handle) != connection_lookup_table_.end()) {
address = connection_lookup_table_[connection_handle];
}
}
}
void HciProcessor::process_le_event(
std::vector<BtaaHciPacket>& btaa_hci_packets, int16_t byte_count, hci::EventView& event) {
uint16_t connection_handle_value = 0;
hci::Address address_value;
auto le_packet_view = hci::LeMetaEventView::Create(event);
if (!le_packet_view.IsValid()) {
return;
}
auto subevent_code = le_packet_view.GetSubeventCode();
auto le_event_info = lookup_le_event(subevent_code);
if (le_event_info.activity != Activity::UNKNOWN) {
// lookup_le_event returns all simple classic event which does not require additional processing.
if (le_event_info.connection_handle_pos) {
auto connection_handle_it = event.begin() + le_event_info.connection_handle_pos;
connection_handle_value = connection_handle_it.extract<uint16_t>();
}
if (le_event_info.address_pos) {
auto address_value_it = event.begin() + le_event_info.address_pos;
address_value = address_value_it.extract<hci::Address>();
}
device_parser_.match_handle_with_address(connection_handle_value, address_value);
btaa_hci_packets.push_back(BtaaHciPacket(le_event_info.activity, address_value, byte_count));
}
}
void HciProcessor::process_special_event(
std::vector<BtaaHciPacket>& btaa_hci_packets,
hci::EventCode event_code,
uint16_t byte_count,
hci::EventView& event) {
uint16_t avg_byte_count;
hci::Address address_value;
switch (event_code) {
case hci::EventCode::INQUIRY_RESULT:
case hci::EventCode::INQUIRY_RESULT_WITH_RSSI: {
auto packet_view = hci::InquiryResultView::Create(event);
if (!packet_view.IsValid()) {
return;
}
auto inquiry_results = packet_view.GetResponses();
avg_byte_count = byte_count / inquiry_results.size();
for (auto& inquiry_result : inquiry_results) {
btaa_hci_packets.push_back(BtaaHciPacket(Activity::SCAN, inquiry_result.bd_addr_, avg_byte_count));
}
} break;
case hci::EventCode::NUMBER_OF_COMPLETED_PACKETS: {
auto packet_view = hci::NumberOfCompletedPacketsView::Create(event);
if (!packet_view.IsValid()) {
return;
}
auto completed_packets = packet_view.GetCompletedPackets();
avg_byte_count = byte_count / completed_packets.size();
for (auto& completed_packet : completed_packets) {
device_parser_.match_handle_with_address(completed_packet.connection_handle_, address_value);
btaa_hci_packets.push_back(BtaaHciPacket(Activity::CONNECT, address_value, avg_byte_count));
}
} break;
case hci::EventCode::RETURN_LINK_KEYS: {
auto packet_view = hci::ReturnLinkKeysView::Create(event);
if (!packet_view.IsValid()) {
return;
}
auto keys_and_addresses = packet_view.GetKeys();
avg_byte_count = byte_count / keys_and_addresses.size();
for (auto& key_and_address : keys_and_addresses) {
btaa_hci_packets.push_back(BtaaHciPacket(Activity::CONNECT, key_and_address.address_, avg_byte_count));
}
} break;
default: {
btaa_hci_packets.push_back(BtaaHciPacket(Activity::UNKNOWN, address_value, byte_count));
} break;
}
}
void HciProcessor::process_command(
std::vector<BtaaHciPacket>& btaa_hci_packets,
packet::PacketView<packet::kLittleEndian>& packet_view,
uint16_t byte_count) {
hci::CommandView command = hci::CommandView::Create(packet_view);
if (!command.IsValid()) {
return;
}
uint16_t connection_handle_value = 0;
hci::Address address_value;
auto opcode = command.GetOpCode();
auto cmd_info = lookup_cmd(opcode);
if (cmd_info.connection_handle_pos) {
auto connection_handle_it = command.begin() + cmd_info.connection_handle_pos;
connection_handle_value = connection_handle_it.extract<uint16_t>();
}
if (cmd_info.address_pos) {
auto address_value_it = command.begin() + cmd_info.address_pos;
address_value = address_value_it.extract<hci::Address>();
}
device_parser_.match_handle_with_address(connection_handle_value, address_value);
pending_command_.btaa_hci_packet = BtaaHciPacket(cmd_info.activity, address_value, byte_count);
pending_command_.opcode = opcode;
}
void HciProcessor::process_event(
std::vector<BtaaHciPacket>& btaa_hci_packets,
packet::PacketView<packet::kLittleEndian>& packet_view,
uint16_t byte_count) {
hci::EventView event = hci::EventView::Create(packet_view);
if (!event.IsValid()) {
return;
}
uint16_t connection_handle_value = 0;
hci::Address address_value;
auto event_code = event.GetEventCode();
auto event_info = lookup_event(event_code);
if (event_info.activity != Activity::UNKNOWN) {
// lookup_event returns all simple classic event which does not require additional processing.
if (event_info.connection_handle_pos) {
auto connection_handle_it = event.begin() + event_info.connection_handle_pos;
connection_handle_value = connection_handle_it.extract<uint16_t>();
}
if (event_info.address_pos) {
auto address_value_it = event.begin() + event_info.address_pos;
address_value = address_value_it.extract<hci::Address>();
}
device_parser_.match_handle_with_address(connection_handle_value, address_value);
btaa_hci_packets.push_back(BtaaHciPacket(event_info.activity, address_value, byte_count));
} else {
// The event requires additional processing.
switch (event_code) {
case hci::EventCode::COMMAND_COMPLETE: {
auto packet_view = hci::CommandCompleteView::Create(event);
if (packet_view.IsValid() && packet_view.GetCommandOpCode() == pending_command_.opcode) {
pending_command_.btaa_hci_packet.byte_count += byte_count;
btaa_hci_packets.push_back(std::move(pending_command_.btaa_hci_packet));
} else {
btaa_hci_packets.push_back(BtaaHciPacket(Activity::UNKNOWN, address_value, byte_count));
}
} break;
case hci::EventCode::COMMAND_STATUS: {
auto packet_view = hci::CommandStatusView::Create(event);
if (packet_view.IsValid() && packet_view.GetCommandOpCode() == pending_command_.opcode) {
pending_command_.btaa_hci_packet.byte_count += byte_count;
btaa_hci_packets.push_back(std::move(pending_command_.btaa_hci_packet));
} else {
btaa_hci_packets.push_back(BtaaHciPacket(Activity::UNKNOWN, address_value, byte_count));
}
break;
}
case hci::EventCode::LE_META_EVENT:
process_le_event(btaa_hci_packets, byte_count, event);
break;
case hci::EventCode::VENDOR_SPECIFIC:
btaa_hci_packets.push_back(BtaaHciPacket(Activity::VENDOR, address_value, byte_count));
break;
default:
process_special_event(btaa_hci_packets, event_code, byte_count, event);
break;
}
}
}
void HciProcessor::process_acl(
std::vector<BtaaHciPacket>& btaa_hci_packets,
packet::PacketView<packet::kLittleEndian>& packet_view,
uint16_t byte_count) {
hci::AclView acl = hci::AclView::Create(packet_view);
auto connection_handle = acl.begin();
// Connection handle is extracted from the 12 least significant bit.
uint16_t connection_handle_value = connection_handle.extract<uint16_t>() & 0xfff;
hci::Address address_value;
device_parser_.match_handle_with_address(connection_handle_value, address_value);
btaa_hci_packets.push_back(BtaaHciPacket(Activity::ACL, address_value, byte_count));
}
void HciProcessor::process_sco(
std::vector<BtaaHciPacket>& btaa_hci_packets,
packet::PacketView<packet::kLittleEndian>& packet_view,
uint16_t byte_count) {
hci::ScoView sco = hci::ScoView::Create(packet_view);
auto connection_handle = sco.begin();
// Connection handle is extracted from the 12 least significant bit.
uint16_t connection_handle_value = connection_handle.extract<uint16_t>() & 0xfff;
hci::Address address_value;
device_parser_.match_handle_with_address(connection_handle_value, address_value);
btaa_hci_packets.push_back(BtaaHciPacket(Activity::HFP, address_value, byte_count));
}
void HciProcessor::process_iso(
std::vector<BtaaHciPacket>& btaa_hci_packets,
packet::PacketView<packet::kLittleEndian>& packet_view,
uint16_t byte_count) {
hci::IsoView iso = hci::IsoView::Create(packet_view);
auto connection_handle = iso.begin();
// Connection handle is extracted from the 12 least significant bit.
uint16_t connection_handle_value = connection_handle.extract<uint16_t>() & 0xfff;
hci::Address address_value;
device_parser_.match_handle_with_address(connection_handle_value, address_value);
btaa_hci_packets.push_back(BtaaHciPacket(Activity::ISO, address_value, byte_count));
}
std::vector<BtaaHciPacket> HciProcessor::OnHciPacket(
hal::HciPacket packet, hal::SnoopLogger::PacketType type, uint16_t length) {
std::vector<BtaaHciPacket> btaa_hci_packets;
auto packet_view = packet::PacketView<packet::kLittleEndian>(std::make_shared<std::vector<uint8_t>>(packet));
switch (type) {
case hal::SnoopLogger::PacketType::CMD:
process_command(btaa_hci_packets, packet_view, length);
break;
case hal::SnoopLogger::PacketType::EVT:
process_event(btaa_hci_packets, packet_view, length);
break;
case hal::SnoopLogger::PacketType::ACL:
process_acl(btaa_hci_packets, packet_view, length);
break;
case hal::SnoopLogger::PacketType::SCO:
process_sco(btaa_hci_packets, packet_view, length);
break;
case hal::SnoopLogger::PacketType::ISO:
process_iso(btaa_hci_packets, packet_view, length);
break;
}
return btaa_hci_packets;
}
} // namespace activity_attribution
} // namespace bluetooth
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