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530 lines
19 KiB
530 lines
19 KiB
/*
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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 "android/net/wifi/nl80211/IWifiScannerImpl.h"
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#include "wificond/scanning/scan_utils.h"
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#include <array>
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#include <vector>
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#include <linux/netlink.h>
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#include <linux/if_ether.h>
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#include <android-base/logging.h>
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#include "wificond/net/kernel-header-latest/nl80211.h"
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#include "wificond/net/netlink_manager.h"
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#include "wificond/net/nl80211_packet.h"
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#include "wificond/scanning/scan_result.h"
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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::RadioChainInfo;
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using std::array;
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using std::unique_ptr;
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using std::vector;
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namespace android {
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namespace wificond {
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namespace {
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constexpr uint8_t kElemIdSsid = 0;
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constexpr unsigned int kMsecPerSec = 1000;
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} // namespace
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ScanUtils::ScanUtils(NetlinkManager* netlink_manager)
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: netlink_manager_(netlink_manager) {
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if (!netlink_manager_->IsStarted()) {
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netlink_manager_->Start();
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}
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}
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ScanUtils::~ScanUtils() {}
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void ScanUtils::SubscribeScanResultNotification(
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uint32_t interface_index,
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OnScanResultsReadyHandler handler) {
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netlink_manager_->SubscribeScanResultNotification(interface_index, handler);
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}
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void ScanUtils::UnsubscribeScanResultNotification(uint32_t interface_index) {
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netlink_manager_->UnsubscribeScanResultNotification(interface_index);
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}
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void ScanUtils::SubscribeSchedScanResultNotification(
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uint32_t interface_index,
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OnSchedScanResultsReadyHandler handler) {
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netlink_manager_->SubscribeSchedScanResultNotification(interface_index,
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handler);
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}
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void ScanUtils::UnsubscribeSchedScanResultNotification(
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uint32_t interface_index) {
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netlink_manager_->UnsubscribeSchedScanResultNotification(interface_index);
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}
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bool ScanUtils::GetScanResult(uint32_t interface_index,
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vector<NativeScanResult>* out_scan_results) {
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NL80211Packet get_scan(
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netlink_manager_->GetFamilyId(),
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NL80211_CMD_GET_SCAN,
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netlink_manager_->GetSequenceNumber(),
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getpid());
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get_scan.AddFlag(NLM_F_DUMP);
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NL80211Attr<uint32_t> ifindex(NL80211_ATTR_IFINDEX, interface_index);
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get_scan.AddAttribute(ifindex);
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vector<unique_ptr<const NL80211Packet>> response;
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if (!netlink_manager_->SendMessageAndGetResponses(get_scan, &response)) {
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LOG(ERROR) << "NL80211_CMD_GET_SCAN dump failed";
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return false;
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}
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if (response.empty()) {
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LOG(INFO) << "Unexpected empty scan result!";
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return true;
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}
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for (auto& packet : response) {
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if (packet->GetMessageType() == NLMSG_ERROR) {
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LOG(ERROR) << "Receive ERROR message: "
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<< strerror(packet->GetErrorCode());
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continue;
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}
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if (packet->GetMessageType() != netlink_manager_->GetFamilyId()) {
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LOG(ERROR) << "Wrong message type: "
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<< packet->GetMessageType();
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continue;
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}
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uint32_t if_index;
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if (!packet->GetAttributeValue(NL80211_ATTR_IFINDEX, &if_index)) {
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LOG(ERROR) << "No interface index in scan result.";
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continue;
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}
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if (if_index != interface_index) {
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LOG(WARNING) << "Uninteresting scan result for interface: " << if_index;
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continue;
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}
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NativeScanResult scan_result;
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if (!ParseScanResult(std::move(packet), &scan_result)) {
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LOG(DEBUG) << "Ignore invalid scan result";
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continue;
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}
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out_scan_results->push_back(std::move(scan_result));
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}
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return true;
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}
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bool ScanUtils::ParseScanResult(unique_ptr<const NL80211Packet> packet,
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NativeScanResult* scan_result) {
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if (packet->GetCommand() != NL80211_CMD_NEW_SCAN_RESULTS) {
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LOG(ERROR) << "Wrong command for new scan result message";
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return false;
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}
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NL80211NestedAttr bss(0);
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if (packet->GetAttribute(NL80211_ATTR_BSS, &bss)) {
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array<uint8_t, ETH_ALEN> bssid;
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if (!bss.GetAttributeValue(NL80211_BSS_BSSID, &bssid)) {
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LOG(ERROR) << "Failed to get BSSID from scan result packet";
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return false;
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}
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uint32_t freq;
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if (!bss.GetAttributeValue(NL80211_BSS_FREQUENCY, &freq)) {
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LOG(ERROR) << "Failed to get Frequency from scan result packet";
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return false;
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}
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vector<uint8_t> ie;
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if (!bss.GetAttributeValue(NL80211_BSS_INFORMATION_ELEMENTS, &ie)) {
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LOG(ERROR) << "Failed to get Information Element from scan result packet";
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return false;
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}
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vector<uint8_t> ssid;
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if (!GetSSIDFromInfoElement(ie, &ssid)) {
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// Skip BSS without SSID IE.
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// These scan results are considered as malformed.
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return false;
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}
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uint64_t last_seen_since_boot_microseconds;
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if (!GetBssTimestamp(bss, &last_seen_since_boot_microseconds)) {
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// Logging is done inside |GetBssTimestamp|.
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return false;
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}
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int32_t signal;
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if (!bss.GetAttributeValue(NL80211_BSS_SIGNAL_MBM, &signal)) {
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LOG(ERROR) << "Failed to get Signal Strength from scan result packet";
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return false;
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}
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uint16_t capability;
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if (!bss.GetAttributeValue(NL80211_BSS_CAPABILITY, &capability)) {
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LOG(ERROR) << "Failed to get capability field from scan result packet";
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return false;
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}
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bool associated = false;
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uint32_t bss_status;
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if (bss.GetAttributeValue(NL80211_BSS_STATUS, &bss_status) &&
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(bss_status == NL80211_BSS_STATUS_AUTHENTICATED ||
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bss_status == NL80211_BSS_STATUS_ASSOCIATED)) {
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associated = true;
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}
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std::vector<RadioChainInfo> radio_chain_infos;
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ParseRadioChainInfos(bss, &radio_chain_infos);
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*scan_result =
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NativeScanResult(ssid, bssid, ie, freq, signal,
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last_seen_since_boot_microseconds,
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capability, associated, radio_chain_infos);
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}
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return true;
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}
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bool ScanUtils::GetBssTimestampForTesting(
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const NL80211NestedAttr& bss,
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uint64_t* last_seen_since_boot_microseconds){
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return GetBssTimestamp(bss, last_seen_since_boot_microseconds);
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}
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bool ScanUtils::GetBssTimestamp(const NL80211NestedAttr& bss,
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uint64_t* last_seen_since_boot_microseconds){
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uint64_t last_seen_since_boot_nanoseconds;
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if (bss.GetAttributeValue(NL80211_BSS_LAST_SEEN_BOOTTIME,
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&last_seen_since_boot_nanoseconds)) {
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*last_seen_since_boot_microseconds = last_seen_since_boot_nanoseconds / 1000;
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} else {
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// Fall back to use TSF if we can't find NL80211_BSS_LAST_SEEN_BOOTTIME
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// attribute.
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if (!bss.GetAttributeValue(NL80211_BSS_TSF, last_seen_since_boot_microseconds)) {
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LOG(ERROR) << "Failed to get TSF from scan result packet";
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return false;
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}
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uint64_t beacon_tsf_microseconds;
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if (bss.GetAttributeValue(NL80211_BSS_BEACON_TSF, &beacon_tsf_microseconds)) {
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*last_seen_since_boot_microseconds = std::max(*last_seen_since_boot_microseconds,
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beacon_tsf_microseconds);
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}
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}
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return true;
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}
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bool ScanUtils::ParseRadioChainInfos(
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const NL80211NestedAttr& bss,
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std::vector<RadioChainInfo> *radio_chain_infos) {
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*radio_chain_infos = {};
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// Contains a nested array of signal strength attributes: (ChainId, Rssi in dBm)
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NL80211NestedAttr radio_chain_infos_attr(0);
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if (!bss.GetAttribute(NL80211_BSS_CHAIN_SIGNAL, &radio_chain_infos_attr)) {
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return false;
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}
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std::vector<NL80211Attr<int8_t>> radio_chain_infos_attrs;
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if (!radio_chain_infos_attr.GetListOfAttributes(
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&radio_chain_infos_attrs)) {
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LOG(ERROR) << "Failed to get radio chain info attrs within "
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<< "NL80211_BSS_CHAIN_SIGNAL";
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return false;
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}
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for (const auto& attr : radio_chain_infos_attrs) {
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RadioChainInfo radio_chain_info;
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radio_chain_info.chain_id = attr.GetAttributeId();
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radio_chain_info.level = attr.GetValue();
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radio_chain_infos->push_back(radio_chain_info);
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}
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return true;
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}
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bool ScanUtils::GetSSIDFromInfoElement(const vector<uint8_t>& ie,
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vector<uint8_t>* ssid) {
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// Information elements are stored in 'TLV' format.
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// Field: | Type | Length | Value |
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// Length: | 1 | 1 | variable |
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// Content:| Element ID | Length of the Value field | Element payload |
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const uint8_t* end = ie.data() + ie.size();
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const uint8_t* ptr = ie.data();
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// +1 means we must have space for the length field.
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while (ptr + 1 < end) {
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uint8_t type = *ptr;
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uint8_t length = *(ptr + 1);
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// Length field is invalid.
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if (ptr + 1 + length >= end) {
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return false;
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}
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// SSID element is found.
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if (type == kElemIdSsid) {
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// SSID is an empty string.
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if (length == 0) {
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*ssid = vector<uint8_t>();
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} else {
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*ssid = vector<uint8_t>(ptr + 2, ptr + length + 2);
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}
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return true;
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}
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ptr += 2 + length;
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}
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return false;
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}
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bool ScanUtils::Scan(uint32_t interface_index,
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bool request_random_mac,
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int scan_type,
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bool enable_6ghz_rnr,
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const vector<vector<uint8_t>>& ssids,
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const vector<uint32_t>& freqs,
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int* error_code) {
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NL80211Packet trigger_scan(
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netlink_manager_->GetFamilyId(),
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NL80211_CMD_TRIGGER_SCAN,
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netlink_manager_->GetSequenceNumber(),
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getpid());
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// If we do not use NLM_F_ACK, we only receive a unicast repsonse
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// when there is an error. If everything is good, scan results notification
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// will only be sent through multicast.
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// If NLM_F_ACK is set, there will always be an unicast repsonse, either an
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// ERROR or an ACK message. The handler will always be called and removed by
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// NetlinkManager.
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trigger_scan.AddFlag(NLM_F_ACK);
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NL80211Attr<uint32_t> if_index_attr(NL80211_ATTR_IFINDEX, interface_index);
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NL80211NestedAttr ssids_attr(NL80211_ATTR_SCAN_SSIDS);
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for (size_t i = 0; i < ssids.size(); i++) {
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ssids_attr.AddAttribute(NL80211Attr<vector<uint8_t>>(i, ssids[i]));
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}
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NL80211NestedAttr freqs_attr(NL80211_ATTR_SCAN_FREQUENCIES);
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for (size_t i = 0; i < freqs.size(); i++) {
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freqs_attr.AddAttribute(NL80211Attr<uint32_t>(i, freqs[i]));
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}
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trigger_scan.AddAttribute(if_index_attr);
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trigger_scan.AddAttribute(ssids_attr);
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// An absence of NL80211_ATTR_SCAN_FREQUENCIES attribue informs kernel to
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// scan all supported frequencies.
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if (!freqs.empty()) {
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trigger_scan.AddAttribute(freqs_attr);
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}
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uint32_t scan_flags = 0;
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if (request_random_mac) {
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scan_flags |= NL80211_SCAN_FLAG_RANDOM_ADDR;
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}
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switch (scan_type) {
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case IWifiScannerImpl::SCAN_TYPE_LOW_SPAN:
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scan_flags |= NL80211_SCAN_FLAG_LOW_SPAN;
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break;
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case IWifiScannerImpl::SCAN_TYPE_LOW_POWER:
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scan_flags |= NL80211_SCAN_FLAG_LOW_POWER;
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break;
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case IWifiScannerImpl::SCAN_TYPE_HIGH_ACCURACY:
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scan_flags |= NL80211_SCAN_FLAG_HIGH_ACCURACY;
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break;
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case IWifiScannerImpl::SCAN_TYPE_DEFAULT:
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break;
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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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if (enable_6ghz_rnr) {
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scan_flags |= NL80211_SCAN_FLAG_COLOCATED_6GHZ;
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}
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if (scan_flags) {
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trigger_scan.AddAttribute(
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NL80211Attr<uint32_t>(NL80211_ATTR_SCAN_FLAGS,
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scan_flags));
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LOG(DEBUG) << "Triggering scan with scan_flag=" << scan_flags;
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}
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// We are receiving an ERROR/ACK message instead of the actual
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// scan results here, so it is OK to expect a timely response because
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// kernel is supposed to send the ERROR/ACK back before the scan starts.
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vector<unique_ptr<const NL80211Packet>> response;
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if (!netlink_manager_->SendMessageAndGetAckOrError(trigger_scan,
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error_code)) {
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// Logging is done inside |SendMessageAndGetAckOrError|.
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return false;
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}
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if (*error_code != 0) {
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LOG(ERROR) << "NL80211_CMD_TRIGGER_SCAN failed: " << strerror(*error_code);
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return false;
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}
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return true;
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}
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bool ScanUtils::StopScheduledScan(uint32_t interface_index) {
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NL80211Packet stop_sched_scan(
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netlink_manager_->GetFamilyId(),
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NL80211_CMD_STOP_SCHED_SCAN,
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netlink_manager_->GetSequenceNumber(),
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getpid());
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// Force an ACK response upon success.
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stop_sched_scan.AddFlag(NLM_F_ACK);
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stop_sched_scan.AddAttribute(
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NL80211Attr<uint32_t>(NL80211_ATTR_IFINDEX, interface_index));
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vector<unique_ptr<const NL80211Packet>> response;
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int error_code;
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if (!netlink_manager_->SendMessageAndGetAckOrError(stop_sched_scan,
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&error_code)) {
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LOG(ERROR) << "NL80211_CMD_STOP_SCHED_SCAN failed";
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return false;
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}
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if (error_code == ENOENT) {
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LOG(WARNING) << "Scheduled scan is not running!";
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return false;
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} else if (error_code != 0) {
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LOG(ERROR) << "Receive ERROR message in response to"
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<< " 'stop scheduled scan' request: "
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<< strerror(error_code);
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return false;
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}
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return true;
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}
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bool ScanUtils::AbortScan(uint32_t interface_index) {
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NL80211Packet abort_scan(
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netlink_manager_->GetFamilyId(),
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NL80211_CMD_ABORT_SCAN,
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netlink_manager_->GetSequenceNumber(),
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getpid());
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// Force an ACK response upon success.
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abort_scan.AddFlag(NLM_F_ACK);
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abort_scan.AddAttribute(
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NL80211Attr<uint32_t>(NL80211_ATTR_IFINDEX, interface_index));
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if (!netlink_manager_->SendMessageAndGetAck(abort_scan)) {
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LOG(ERROR) << "NL80211_CMD_ABORT_SCAN failed";
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return false;
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}
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return true;
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}
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bool ScanUtils::StartScheduledScan(
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uint32_t interface_index,
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const SchedScanIntervalSetting& interval_setting,
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int32_t rssi_threshold_2g,
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int32_t rssi_threshold_5g,
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int32_t rssi_threshold_6g,
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const SchedScanReqFlags& req_flags,
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const std::vector<std::vector<uint8_t>>& scan_ssids,
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const std::vector<std::vector<uint8_t>>& match_ssids,
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const std::vector<uint32_t>& freqs,
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int* error_code) {
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NL80211Packet start_sched_scan(
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netlink_manager_->GetFamilyId(),
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NL80211_CMD_START_SCHED_SCAN,
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netlink_manager_->GetSequenceNumber(),
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getpid());
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// Force an ACK response upon success.
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start_sched_scan.AddFlag(NLM_F_ACK);
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NL80211NestedAttr scan_ssids_attr(NL80211_ATTR_SCAN_SSIDS);
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for (size_t i = 0; i < scan_ssids.size(); i++) {
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scan_ssids_attr.AddAttribute(NL80211Attr<vector<uint8_t>>(i, scan_ssids[i]));
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}
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NL80211NestedAttr freqs_attr(NL80211_ATTR_SCAN_FREQUENCIES);
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for (size_t i = 0; i < freqs.size(); i++) {
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freqs_attr.AddAttribute(NL80211Attr<uint32_t>(i, freqs[i]));
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}
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// Structure of attributes of scheduled scan filters:
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// | Nested Attribute: id: NL80211_ATTR_SCHED_SCAN_MATCH |
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// | Nested Attributed: id: 0 | Nested Attributed: id: 1 | Nested Attr: id: 2 | ... |
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// | MATCH_SSID | MATCH_RSSI(optional) | MATCH_SSID | MACTCH_RSSI(optional) | MATCH_RSSI(optinal, global) | ... |
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NL80211NestedAttr scan_match_attr(NL80211_ATTR_SCHED_SCAN_MATCH);
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for (size_t i = 0; i < match_ssids.size(); i++) {
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NL80211NestedAttr match_group(i);
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match_group.AddAttribute(
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NL80211Attr<vector<uint8_t>>(NL80211_SCHED_SCAN_MATCH_ATTR_SSID, match_ssids[i]));
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match_group.AddAttribute(
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NL80211Attr<int32_t>(NL80211_SCHED_SCAN_MATCH_ATTR_RSSI, rssi_threshold_5g));
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scan_match_attr.AddAttribute(match_group);
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}
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start_sched_scan.AddAttribute(scan_match_attr);
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// We set 5g threshold for default and ajust threshold for 2g band.
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// check sched_scan supported before set NL80211_ATTR_SCHED_SCAN_RSSI_ADJUST attribute.
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if (req_flags.request_sched_scan_relative_rssi) {
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struct nl80211_bss_select_rssi_adjust rssi_adjust;
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rssi_adjust.band = NL80211_BAND_2GHZ;
|
|
rssi_adjust.delta = static_cast<int8_t>(rssi_threshold_2g - rssi_threshold_5g);
|
|
NL80211Attr<vector<uint8_t>> rssi_adjust_attr(
|
|
NL80211_ATTR_SCHED_SCAN_RSSI_ADJUST,
|
|
vector<uint8_t>(
|
|
reinterpret_cast<uint8_t*>(&rssi_adjust),
|
|
reinterpret_cast<uint8_t*>(&rssi_adjust) + sizeof(rssi_adjust)));
|
|
start_sched_scan.AddAttribute(rssi_adjust_attr);
|
|
}
|
|
|
|
//TODO: No adjustment is possible now for 6GHz due to lack of definition in
|
|
//nl80211.h for NL80211_BAND_6GHZ attribute
|
|
|
|
// Append all attributes to the NL80211_CMD_START_SCHED_SCAN packet.
|
|
start_sched_scan.AddAttribute(
|
|
NL80211Attr<uint32_t>(NL80211_ATTR_IFINDEX, interface_index));
|
|
start_sched_scan.AddAttribute(scan_ssids_attr);
|
|
// An absence of NL80211_ATTR_SCAN_FREQUENCIES attribue informs kernel to
|
|
// scan all supported frequencies.
|
|
if (!freqs.empty()) {
|
|
start_sched_scan.AddAttribute(freqs_attr);
|
|
}
|
|
|
|
if (!interval_setting.plans.empty()) {
|
|
NL80211NestedAttr scan_plans(NL80211_ATTR_SCHED_SCAN_PLANS);
|
|
for (unsigned int i = 0; i < interval_setting.plans.size(); i++) {
|
|
NL80211NestedAttr scan_plan(i + 1);
|
|
scan_plan.AddAttribute(
|
|
NL80211Attr<uint32_t>(NL80211_SCHED_SCAN_PLAN_INTERVAL,
|
|
interval_setting.plans[i].interval_ms / kMsecPerSec));
|
|
scan_plan.AddAttribute(
|
|
NL80211Attr<uint32_t>(NL80211_SCHED_SCAN_PLAN_ITERATIONS,
|
|
interval_setting.plans[i].n_iterations));
|
|
scan_plans.AddAttribute(scan_plan);
|
|
}
|
|
NL80211NestedAttr last_scan_plan(interval_setting.plans.size() + 1);
|
|
last_scan_plan.AddAttribute(
|
|
NL80211Attr<uint32_t>(NL80211_SCHED_SCAN_PLAN_INTERVAL,
|
|
interval_setting.final_interval_ms / kMsecPerSec));
|
|
scan_plans.AddAttribute(last_scan_plan);
|
|
start_sched_scan.AddAttribute(scan_plans);
|
|
} else {
|
|
start_sched_scan.AddAttribute(
|
|
NL80211Attr<uint32_t>(NL80211_ATTR_SCHED_SCAN_INTERVAL,
|
|
interval_setting.final_interval_ms));
|
|
}
|
|
uint32_t scan_flags = 0;
|
|
if (req_flags.request_random_mac) {
|
|
scan_flags |= NL80211_SCAN_FLAG_RANDOM_ADDR;
|
|
}
|
|
if (req_flags.request_low_power) {
|
|
scan_flags |= NL80211_SCAN_FLAG_LOW_POWER;
|
|
}
|
|
if (scan_flags) {
|
|
start_sched_scan.AddAttribute(
|
|
NL80211Attr<uint32_t>(NL80211_ATTR_SCAN_FLAGS,
|
|
scan_flags));
|
|
}
|
|
|
|
vector<unique_ptr<const NL80211Packet>> response;
|
|
if (!netlink_manager_->SendMessageAndGetAckOrError(start_sched_scan,
|
|
error_code)) {
|
|
// Logging is done inside |SendMessageAndGetAckOrError|.
|
|
return false;
|
|
}
|
|
if (*error_code != 0) {
|
|
LOG(ERROR) << "NL80211_CMD_START_SCHED_SCAN failed: " << strerror(*error_code);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
} // namespace wificond
|
|
} // namespace android
|