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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.
*/
package android.net.util;
import android.net.TetherStatsParcel;
import android.net.TetheringRequestParcel;
import androidx.annotation.NonNull;
import java.io.FileDescriptor;
import java.net.SocketException;
import java.util.Objects;
/**
* The classes and the methods for tethering utilization.
*
* {@hide}
*/
public class TetheringUtils {
/**
* The object which records offload Tx/Rx forwarded bytes/packets.
* TODO: Replace the inner class ForwardedStats of class OffloadHardwareInterface with
* this class as well.
*/
public static class ForwardedStats {
public final long rxBytes;
public final long rxPackets;
public final long txBytes;
public final long txPackets;
public ForwardedStats() {
rxBytes = 0;
rxPackets = 0;
txBytes = 0;
txPackets = 0;
}
public ForwardedStats(long rxBytes, long txBytes) {
this.rxBytes = rxBytes;
this.rxPackets = 0;
this.txBytes = txBytes;
this.txPackets = 0;
}
public ForwardedStats(long rxBytes, long rxPackets, long txBytes, long txPackets) {
this.rxBytes = rxBytes;
this.rxPackets = rxPackets;
this.txBytes = txBytes;
this.txPackets = txPackets;
}
public ForwardedStats(@NonNull TetherStatsParcel tetherStats) {
rxBytes = tetherStats.rxBytes;
rxPackets = tetherStats.rxPackets;
txBytes = tetherStats.txBytes;
txPackets = tetherStats.txPackets;
}
public ForwardedStats(@NonNull ForwardedStats other) {
rxBytes = other.rxBytes;
rxPackets = other.rxPackets;
txBytes = other.txBytes;
txPackets = other.txPackets;
}
/** Add Tx/Rx bytes/packets and return the result as a new object. */
@NonNull
public ForwardedStats add(@NonNull ForwardedStats other) {
return new ForwardedStats(rxBytes + other.rxBytes, rxPackets + other.rxPackets,
txBytes + other.txBytes, txPackets + other.txPackets);
}
/** Subtract Tx/Rx bytes/packets and return the result as a new object. */
@NonNull
public ForwardedStats subtract(@NonNull ForwardedStats other) {
// TODO: Perhaps throw an exception if any negative difference value just in case.
final long rxBytesDiff = Math.max(rxBytes - other.rxBytes, 0);
final long rxPacketsDiff = Math.max(rxPackets - other.rxPackets, 0);
final long txBytesDiff = Math.max(txBytes - other.txBytes, 0);
final long txPacketsDiff = Math.max(txPackets - other.txPackets, 0);
return new ForwardedStats(rxBytesDiff, rxPacketsDiff, txBytesDiff, txPacketsDiff);
}
/** Returns the string representation of this object. */
@NonNull
public String toString() {
return String.format("ForwardedStats(rxb: %d, rxp: %d, txb: %d, txp: %d)", rxBytes,
rxPackets, txBytes, txPackets);
}
}
/**
* Configures a socket for receiving ICMPv6 router solicitations and sending advertisements.
* @param fd the socket's {@link FileDescriptor}.
* @param ifIndex the interface index.
*/
public static native void setupRaSocket(FileDescriptor fd, int ifIndex)
throws SocketException;
/**
* Read s as an unsigned 16-bit integer.
*/
public static int uint16(short s) {
return s & 0xffff;
}
/** Check whether two TetheringRequestParcels are the same. */
public static boolean isTetheringRequestEquals(final TetheringRequestParcel request,
final TetheringRequestParcel otherRequest) {
if (request == otherRequest) return true;
return request != null && otherRequest != null
&& request.tetheringType == otherRequest.tetheringType
&& Objects.equals(request.localIPv4Address, otherRequest.localIPv4Address)
&& Objects.equals(request.staticClientAddress, otherRequest.staticClientAddress)
&& request.exemptFromEntitlementCheck == otherRequest.exemptFromEntitlementCheck
&& request.showProvisioningUi == otherRequest.showProvisioningUi;
}
}
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