513 lines
17 KiB
C++
513 lines
17 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "wificond/scanning/scanner_impl.h"
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#include <set>
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#include <string>
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#include <vector>
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#include <android-base/logging.h>
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#include "wificond/client_interface_impl.h"
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#include "wificond/scanning/scan_utils.h"
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using android::binder::Status;
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using android::sp;
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using android::net::wifi::nl80211::IPnoScanEvent;
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using android::net::wifi::nl80211::IScanEvent;
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using android::net::wifi::nl80211::IWifiScannerImpl;
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using android::net::wifi::nl80211::NativeScanResult;
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using android::net::wifi::nl80211::PnoSettings;
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using android::net::wifi::nl80211::SingleScanSettings;
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using std::string;
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using std::vector;
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using std::weak_ptr;
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using std::shared_ptr;
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using namespace std::placeholders;
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namespace {
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using android::wificond::WiphyFeatures;
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bool IsScanTypeSupported(int scan_type, const WiphyFeatures& wiphy_features) {
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switch(scan_type) {
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case IWifiScannerImpl::SCAN_TYPE_LOW_SPAN:
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return wiphy_features.supports_low_span_oneshot_scan;
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case IWifiScannerImpl::SCAN_TYPE_LOW_POWER:
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return wiphy_features.supports_low_power_oneshot_scan;
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case IWifiScannerImpl::SCAN_TYPE_HIGH_ACCURACY:
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return wiphy_features.supports_high_accuracy_oneshot_scan;
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default:
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CHECK(0) << "Invalid scan type received: " << scan_type;
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}
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return {};
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}
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constexpr const int kPercentNetworksWithFreq = 30;
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constexpr const int32_t kPnoScanDefaultFreqs2G[] = {2412, 2417, 2422, 2427, 2432, 2437, 2447, 2452,
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2457, 2462};
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constexpr const int32_t kPnoScanDefaultFreqs5G[] = {5180, 5200, 5220, 5240, 5745, 5765, 5785, 5805};
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} // namespace
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namespace android {
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namespace wificond {
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ScannerImpl::ScannerImpl(uint32_t interface_index,
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const ScanCapabilities& scan_capabilities,
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const WiphyFeatures& wiphy_features,
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ClientInterfaceImpl* client_interface,
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ScanUtils* scan_utils)
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: valid_(true),
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scan_started_(false),
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pno_scan_started_(false),
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nodev_counter_(0),
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interface_index_(interface_index),
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scan_capabilities_(scan_capabilities),
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wiphy_features_(wiphy_features),
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client_interface_(client_interface),
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scan_utils_(scan_utils),
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scan_event_handler_(nullptr) {
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// Subscribe one-shot scan result notification from kernel.
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LOG(INFO) << "subscribe scan result for interface with index: "
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<< (int)interface_index_;
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scan_utils_->SubscribeScanResultNotification(
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interface_index_,
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std::bind(&ScannerImpl::OnScanResultsReady, this, _1, _2, _3, _4));
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// Subscribe scheduled scan result notification from kernel.
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scan_utils_->SubscribeSchedScanResultNotification(
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interface_index_,
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std::bind(&ScannerImpl::OnSchedScanResultsReady,
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this,
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_1, _2));
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}
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ScannerImpl::~ScannerImpl() {}
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void ScannerImpl::Invalidate() {
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LOG(INFO) << "Unsubscribe scan result for interface with index: "
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<< (int)interface_index_;
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scan_utils_->UnsubscribeScanResultNotification(interface_index_);
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scan_utils_->UnsubscribeSchedScanResultNotification(interface_index_);
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valid_ = false;
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}
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bool ScannerImpl::CheckIsValid() {
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if (!valid_) {
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LOG(DEBUG) << "Calling on a invalid scanner object."
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<< "Underlying client interface object was destroyed.";
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}
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return valid_;
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}
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Status ScannerImpl::getScanResults(vector<NativeScanResult>* out_scan_results) {
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if (!CheckIsValid()) {
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return Status::ok();
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}
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if (!scan_utils_->GetScanResult(interface_index_, out_scan_results)) {
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LOG(ERROR) << "Failed to get scan results via NL80211";
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}
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return Status::ok();
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}
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Status ScannerImpl::getPnoScanResults(
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vector<NativeScanResult>* out_scan_results) {
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if (!CheckIsValid()) {
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return Status::ok();
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}
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if (!scan_utils_->GetScanResult(interface_index_, out_scan_results)) {
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LOG(ERROR) << "Failed to get scan results via NL80211";
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}
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return Status::ok();
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}
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Status ScannerImpl::getMaxSsidsPerScan(int32_t* out_max_ssids_per_scan) {
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if (!CheckIsValid()) {
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*out_max_ssids_per_scan = 0;
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return Status::ok();
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}
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*out_max_ssids_per_scan = static_cast<int32_t>(scan_capabilities_.max_num_scan_ssids);
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return Status::ok();
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}
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Status ScannerImpl::scan(const SingleScanSettings& scan_settings,
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bool* out_success) {
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if (!CheckIsValid()) {
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*out_success = false;
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return Status::ok();
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}
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if (scan_started_) {
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LOG(WARNING) << "Scan already started";
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}
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// Only request MAC address randomization when station is not associated.
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bool request_random_mac =
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wiphy_features_.supports_random_mac_oneshot_scan &&
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!client_interface_->IsAssociated();
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int scan_type = scan_settings.scan_type_;
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if (!IsScanTypeSupported(scan_settings.scan_type_, wiphy_features_)) {
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LOG(DEBUG) << "Ignoring scan type because device does not support it";
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scan_type = SCAN_TYPE_DEFAULT;
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}
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// Initialize it with an empty ssid for a wild card scan.
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vector<vector<uint8_t>> ssids = {{}};
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vector<vector<uint8_t>> skipped_scan_ssids;
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vector<vector<uint8_t>> skipped_long_ssids;
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for (auto& network : scan_settings.hidden_networks_) {
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if (ssids.size() + 1 > scan_capabilities_.max_num_scan_ssids) {
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skipped_scan_ssids.emplace_back(network.ssid_);
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continue;
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}
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if (network.ssid_.size() > 32) {
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skipped_long_ssids.emplace_back(network.ssid_);
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continue;
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}
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ssids.push_back(network.ssid_);
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}
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LogSsidList(skipped_scan_ssids, "Skip scan ssid for single scan");
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LogSsidList(skipped_long_ssids, "Skip too long ssid");
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vector<uint32_t> freqs;
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for (auto& channel : scan_settings.channel_settings_) {
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freqs.push_back(channel.frequency_);
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}
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int error_code = 0;
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if (!scan_utils_->Scan(interface_index_, request_random_mac, scan_type,
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scan_settings.enable_6ghz_rnr_, ssids, freqs, &error_code)) {
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if (error_code == ENODEV) {
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nodev_counter_ ++;
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LOG(WARNING) << "Scan failed with error=nodev. counter=" << nodev_counter_;
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}
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CHECK(error_code != ENODEV || nodev_counter_ <= 3)
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<< "Driver is in a bad state, restarting wificond";
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*out_success = false;
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return Status::ok();
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}
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nodev_counter_ = 0;
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scan_started_ = true;
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*out_success = true;
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return Status::ok();
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}
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Status ScannerImpl::startPnoScan(const PnoSettings& pno_settings,
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bool* out_success) {
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pno_settings_ = pno_settings;
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LOG(VERBOSE) << "startPnoScan";
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*out_success = StartPnoScanDefault(pno_settings);
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return Status::ok();
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}
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void ScannerImpl::ParsePnoSettings(const PnoSettings& pno_settings,
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vector<vector<uint8_t>>* scan_ssids,
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vector<vector<uint8_t>>* match_ssids,
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vector<uint32_t>* freqs,
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vector<uint8_t>* match_security) {
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// TODO provide actionable security match parameters
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const uint8_t kNetworkFlagsDefault = 0;
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vector<vector<uint8_t>> skipped_scan_ssids;
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vector<vector<uint8_t>> skipped_match_ssids;
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std::set<int32_t> unique_frequencies;
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int num_networks_no_freqs = 0;
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// Get the list of supported frequencies
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const auto band_2g = client_interface_->GetBandInfo().band_2g;
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const auto band_5g = client_interface_->GetBandInfo().band_5g;
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const auto band_dfs = client_interface_->GetBandInfo().band_dfs;
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const auto band_6g = client_interface_->GetBandInfo().band_6g;
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const auto band_60g = client_interface_->GetBandInfo().band_60g;
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std::set<uint32_t> all_freqs;
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all_freqs.insert(band_2g.begin(), band_2g.end());
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all_freqs.insert(band_5g.begin(), band_5g.end());
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all_freqs.insert(band_dfs.begin(), band_dfs.end());
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all_freqs.insert(band_6g.begin(), band_6g.end());
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all_freqs.insert(band_60g.begin(), band_60g.end());
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for (auto& network : pno_settings.pno_networks_) {
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// Add hidden network ssid.
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if (network.is_hidden_) {
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if (scan_ssids->size() + 1 >
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scan_capabilities_.max_num_sched_scan_ssids) {
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skipped_scan_ssids.emplace_back(network.ssid_);
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continue;
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}
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scan_ssids->push_back(network.ssid_);
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}
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if (match_ssids->size() + 1 > scan_capabilities_.max_match_sets) {
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skipped_match_ssids.emplace_back(network.ssid_);
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continue;
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}
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match_ssids->push_back(network.ssid_);
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match_security->push_back(kNetworkFlagsDefault);
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// build the set of unique frequencies to scan for.
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for (const auto& frequency : network.frequencies_) {
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if (all_freqs.find(frequency) != all_freqs.end()) {
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unique_frequencies.insert(frequency);
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} else {
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LOG(INFO) << "filtered out invalid frequency " << frequency;
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}
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}
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if (network.frequencies_.empty()) {
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num_networks_no_freqs++;
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}
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}
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// Also scan the default frequencies if more than kPercentNetworksWithFreq of
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// networks don't have frequency data.
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if (num_networks_no_freqs * 100 > kPercentNetworksWithFreq * match_ssids->size()) {
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// Filter out frequencies not supported by chip.
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for (const auto frequency : kPnoScanDefaultFreqs2G) {
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if (std::find(band_2g.begin(), band_2g.end(), frequency) != band_2g.end()) {
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unique_frequencies.insert(frequency);
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}
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}
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// Note: kPnoScanDefaultFreqs5G doesn't contain DFS frequencies.
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for (const auto frequency : kPnoScanDefaultFreqs5G) {
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if (std::find(band_5g.begin(), band_5g.end(), frequency) != band_5g.end()) {
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unique_frequencies.insert(frequency);
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}
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}
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}
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for (const auto& frequency : unique_frequencies) {
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freqs->push_back(frequency);
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}
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LogSsidList(skipped_scan_ssids, "Skip scan ssid for pno scan");
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LogSsidList(skipped_match_ssids, "Skip match ssid for pno scan");
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}
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bool ScannerImpl::StartPnoScanDefault(const PnoSettings& pno_settings) {
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if (!CheckIsValid()) {
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return false;
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}
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if (pno_scan_started_) {
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LOG(WARNING) << "Pno scan already started";
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}
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// An empty ssid for a wild card scan.
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vector<vector<uint8_t>> scan_ssids = {{}};
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vector<vector<uint8_t>> match_ssids;
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vector<uint8_t> unused;
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// Empty frequency list: scan all frequencies.
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vector<uint32_t> freqs;
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ParsePnoSettings(pno_settings, &scan_ssids, &match_ssids, &freqs, &unused);
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// Only request MAC address randomization when station is not associated.
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bool request_random_mac = wiphy_features_.supports_random_mac_sched_scan &&
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!client_interface_->IsAssociated();
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// Always request a low power scan for PNO, if device supports it.
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bool request_low_power = wiphy_features_.supports_low_power_oneshot_scan;
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bool request_sched_scan_relative_rssi = wiphy_features_.supports_ext_sched_scan_relative_rssi;
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int error_code = 0;
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struct SchedScanReqFlags req_flags = {};
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req_flags.request_random_mac = request_random_mac;
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req_flags.request_low_power = request_low_power;
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req_flags.request_sched_scan_relative_rssi = request_sched_scan_relative_rssi;
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if (!scan_utils_->StartScheduledScan(interface_index_,
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GenerateIntervalSetting(pno_settings),
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pno_settings.min_2g_rssi_,
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pno_settings.min_5g_rssi_,
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pno_settings.min_6g_rssi_,
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req_flags,
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scan_ssids,
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match_ssids,
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freqs,
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&error_code)) {
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if (error_code == ENODEV) {
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nodev_counter_ ++;
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LOG(WARNING) << "Pno Scan failed with error=nodev. counter=" << nodev_counter_;
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}
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LOG(ERROR) << "Failed to start pno scan";
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CHECK(error_code != ENODEV || nodev_counter_ <= 3)
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<< "Driver is in a bad state, restarting wificond";
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return false;
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}
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string freq_string;
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if (freqs.empty()) {
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freq_string = "for all supported frequencies";
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} else {
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freq_string = "for frequencies: ";
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for (uint32_t f : freqs) {
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freq_string += std::to_string(f) + ", ";
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}
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}
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LOG(INFO) << "Pno scan started " << freq_string;
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nodev_counter_ = 0;
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pno_scan_started_ = true;
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return true;
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}
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Status ScannerImpl::stopPnoScan(bool* out_success) {
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*out_success = StopPnoScanDefault();
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return Status::ok();
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}
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bool ScannerImpl::StopPnoScanDefault() {
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if (!CheckIsValid()) {
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return false;
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}
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if (!pno_scan_started_) {
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LOG(WARNING) << "No pno scan started";
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}
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if (!scan_utils_->StopScheduledScan(interface_index_)) {
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return false;
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}
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LOG(INFO) << "Pno scan stopped";
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pno_scan_started_ = false;
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return true;
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}
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Status ScannerImpl::abortScan() {
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if (!CheckIsValid()) {
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return Status::ok();
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}
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if (!scan_started_) {
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LOG(WARNING) << "Scan is not started. Ignore abort request";
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return Status::ok();
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}
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if (!scan_utils_->AbortScan(interface_index_)) {
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LOG(WARNING) << "Abort scan failed";
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}
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return Status::ok();
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}
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Status ScannerImpl::subscribeScanEvents(const sp<IScanEvent>& handler) {
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if (!CheckIsValid()) {
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return Status::ok();
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}
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if (scan_event_handler_ != nullptr) {
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LOG(ERROR) << "Found existing scan events subscriber."
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<< " This subscription request will unsubscribe it";
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}
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scan_event_handler_ = handler;
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return Status::ok();
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}
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Status ScannerImpl::unsubscribeScanEvents() {
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scan_event_handler_ = nullptr;
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return Status::ok();
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}
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Status ScannerImpl::subscribePnoScanEvents(const sp<IPnoScanEvent>& handler) {
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if (!CheckIsValid()) {
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return Status::ok();
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}
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if (pno_scan_event_handler_ != nullptr) {
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LOG(ERROR) << "Found existing pno scan events subscriber."
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<< " This subscription request will unsubscribe it";
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}
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pno_scan_event_handler_ = handler;
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return Status::ok();
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}
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Status ScannerImpl::unsubscribePnoScanEvents() {
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pno_scan_event_handler_ = nullptr;
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return Status::ok();
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}
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void ScannerImpl::OnScanResultsReady(uint32_t interface_index, bool aborted,
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vector<vector<uint8_t>>& ssids,
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vector<uint32_t>& frequencies) {
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if (!scan_started_) {
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LOG(INFO) << "Received external scan result notification from kernel.";
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}
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scan_started_ = false;
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if (scan_event_handler_ != nullptr) {
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// TODO: Pass other parameters back once we find framework needs them.
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if (aborted) {
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LOG(WARNING) << "Scan aborted";
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scan_event_handler_->OnScanFailed();
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} else {
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scan_event_handler_->OnScanResultReady();
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}
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} else {
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LOG(WARNING) << "No scan event handler found.";
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}
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}
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void ScannerImpl::OnSchedScanResultsReady(uint32_t interface_index,
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bool scan_stopped) {
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if (pno_scan_event_handler_ != nullptr) {
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if (scan_stopped) {
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// If |pno_scan_started_| is false.
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// This stop notification might result from our own request.
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// See the document for NL80211_CMD_SCHED_SCAN_STOPPED in nl80211.h.
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if (pno_scan_started_) {
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LOG(WARNING) << "Unexpected pno scan stopped event";
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pno_scan_event_handler_->OnPnoScanFailed();
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}
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pno_scan_started_ = false;
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} else {
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LOG(INFO) << "Pno scan result ready event";
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pno_scan_event_handler_->OnPnoNetworkFound();
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}
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}
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}
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SchedScanIntervalSetting ScannerImpl::GenerateIntervalSetting(
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const android::net::wifi::nl80211::PnoSettings&
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pno_settings) const {
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bool support_num_scan_plans = scan_capabilities_.max_num_scan_plans >= 2;
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bool support_scan_plan_interval =
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scan_capabilities_.max_scan_plan_interval * 1000 >=
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pno_settings.interval_ms_ * PnoSettings::kSlowScanIntervalMultiplier;
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bool support_scan_plan_iterations =
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scan_capabilities_.max_scan_plan_iterations >=
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PnoSettings::kFastScanIterations;
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uint32_t fast_scan_interval =
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|
static_cast<uint32_t>(pno_settings.interval_ms_);
|
|
if (support_num_scan_plans && support_scan_plan_interval &&
|
|
support_scan_plan_iterations) {
|
|
return SchedScanIntervalSetting{
|
|
{{fast_scan_interval, PnoSettings::kFastScanIterations}},
|
|
fast_scan_interval * PnoSettings::kSlowScanIntervalMultiplier};
|
|
} else {
|
|
// Device doesn't support the provided scan plans.
|
|
// Specify single interval instead.
|
|
// In this case, the driver/firmware is expected to implement back off
|
|
// logic internally using |pno_settings.interval_ms_| as "fast scan"
|
|
// interval.
|
|
return SchedScanIntervalSetting{{}, fast_scan_interval};
|
|
}
|
|
}
|
|
|
|
void ScannerImpl::LogSsidList(vector<vector<uint8_t>>& ssid_list,
|
|
string prefix) {
|
|
if (ssid_list.empty()) {
|
|
return;
|
|
}
|
|
string ssid_list_string;
|
|
for (auto& ssid : ssid_list) {
|
|
ssid_list_string += string(ssid.begin(), ssid.end());
|
|
if (&ssid != &ssid_list.back()) {
|
|
ssid_list_string += ", ";
|
|
}
|
|
}
|
|
LOG(WARNING) << prefix << ": " << ssid_list_string;
|
|
}
|
|
|
|
} // namespace wificond
|
|
} // namespace android
|