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/*
* Copyright (C) 2019 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 <net/if.h>
#include <cstddef>
#include <iostream>
#include <limits>
#include <random>
#include <android-base/logging.h>
#include <android-base/macros.h>
#include <private/android_filesystem_config.h>
#undef NAN
#include "wifi_iface_util.h"
namespace {
// Constants to set the local bit & clear the multicast bit.
constexpr uint8_t kMacAddressMulticastMask = 0x01;
constexpr uint8_t kMacAddressLocallyAssignedMask = 0x02;
} // namespace
namespace android {
namespace hardware {
namespace wifi {
namespace V1_6 {
namespace implementation {
namespace iface_util {
WifiIfaceUtil::WifiIfaceUtil(const std::weak_ptr<wifi_system::InterfaceTool> iface_tool,
const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal)
: iface_tool_(iface_tool),
legacy_hal_(legacy_hal),
random_mac_address_(nullptr),
event_handlers_map_() {}
std::array<uint8_t, 6> WifiIfaceUtil::getFactoryMacAddress(const std::string& iface_name) {
return iface_tool_.lock()->GetFactoryMacAddress(iface_name.c_str());
}
bool WifiIfaceUtil::setMacAddress(const std::string& iface_name,
const std::array<uint8_t, 6>& mac) {
#ifndef WIFI_AVOID_IFACE_RESET_MAC_CHANGE
legacy_hal::wifi_error legacy_status;
uint64_t legacy_feature_set;
std::tie(legacy_status, legacy_feature_set) =
legacy_hal_.lock()->getSupportedFeatureSet(iface_name);
if (!(legacy_feature_set & WIFI_FEATURE_DYNAMIC_SET_MAC) &&
!iface_tool_.lock()->SetUpState(iface_name.c_str(), false)) {
LOG(ERROR) << "SetUpState(false) failed.";
return false;
}
#endif
bool success = iface_tool_.lock()->SetMacAddress(iface_name.c_str(), mac);
#ifndef WIFI_AVOID_IFACE_RESET_MAC_CHANGE
if (!(legacy_feature_set & WIFI_FEATURE_DYNAMIC_SET_MAC) &&
!iface_tool_.lock()->SetUpState(iface_name.c_str(), true)) {
LOG(ERROR) << "SetUpState(true) failed. Wait for driver ready.";
// Wait for driver ready and try to set iface UP again
if (legacy_hal_.lock()->waitForDriverReady() != legacy_hal::WIFI_SUCCESS) {
LOG(ERROR) << "SetUpState(true) wait for driver ready failed.";
return false;
}
if (!iface_tool_.lock()->SetUpState(iface_name.c_str(), true)) {
LOG(ERROR) << "SetUpState(true) failed after retry.";
return false;
}
}
#endif
IfaceEventHandlers event_handlers = {};
const auto it = event_handlers_map_.find(iface_name);
if (it != event_handlers_map_.end()) {
event_handlers = it->second;
}
if (event_handlers.on_state_toggle_off_on != nullptr) {
event_handlers.on_state_toggle_off_on(iface_name);
}
if (!success) {
LOG(ERROR) << "SetMacAddress failed on " << iface_name;
} else {
LOG(DEBUG) << "SetMacAddress succeeded on " << iface_name;
}
return success;
}
std::array<uint8_t, 6> WifiIfaceUtil::getOrCreateRandomMacAddress() {
if (random_mac_address_) {
return *random_mac_address_.get();
}
random_mac_address_ = std::make_unique<std::array<uint8_t, 6>>(createRandomMacAddress());
return *random_mac_address_.get();
}
void WifiIfaceUtil::registerIfaceEventHandlers(const std::string& iface_name,
IfaceEventHandlers handlers) {
event_handlers_map_[iface_name] = handlers;
}
void WifiIfaceUtil::unregisterIfaceEventHandlers(const std::string& iface_name) {
event_handlers_map_.erase(iface_name);
}
std::array<uint8_t, 6> WifiIfaceUtil::createRandomMacAddress() {
std::array<uint8_t, 6> address = {};
std::random_device rd;
std::default_random_engine engine(rd());
std::uniform_int_distribution<uint8_t> dist(std::numeric_limits<uint8_t>::min(),
std::numeric_limits<uint8_t>::max());
for (size_t i = 0; i < address.size(); i++) {
address[i] = dist(engine);
}
// Set the local bit and clear the multicast bit.
address[0] |= kMacAddressLocallyAssignedMask;
address[0] &= ~kMacAddressMulticastMask;
return address;
}
bool WifiIfaceUtil::setUpState(const std::string& iface_name, bool request_up) {
if (!iface_tool_.lock()->SetUpState(iface_name.c_str(), request_up)) {
LOG(ERROR) << "SetUpState to " << request_up << " failed";
return false;
}
return true;
}
unsigned WifiIfaceUtil::ifNameToIndex(const std::string& iface_name) {
return if_nametoindex(iface_name.c_str());
}
bool WifiIfaceUtil::createBridge(const std::string& br_name) {
if (!iface_tool_.lock()->createBridge(br_name)) {
return false;
}
if (!iface_tool_.lock()->SetUpState(br_name.c_str(), true)) {
LOG(ERROR) << "bridge SetUpState(true) failed.";
}
return true;
}
bool WifiIfaceUtil::deleteBridge(const std::string& br_name) {
if (!iface_tool_.lock()->SetUpState(br_name.c_str(), false)) {
LOG(INFO) << "SetUpState(false) failed for bridge=" << br_name.c_str();
}
return iface_tool_.lock()->deleteBridge(br_name);
}
bool WifiIfaceUtil::addIfaceToBridge(const std::string& br_name, const std::string& if_name) {
return iface_tool_.lock()->addIfaceToBridge(br_name, if_name);
}
bool WifiIfaceUtil::removeIfaceFromBridge(const std::string& br_name, const std::string& if_name) {
return iface_tool_.lock()->removeIfaceFromBridge(br_name, if_name);
}
} // namespace iface_util
} // namespace implementation
} // namespace V1_6
} // namespace wifi
} // namespace hardware
} // namespace android
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