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/*
* Copyright (C) 2016 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.apf;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.SystemApi;
import android.content.Context;
import android.content.res.Resources;
import android.net.ConnectivityResources;
import android.os.Parcel;
import android.os.Parcelable;
/**
* APF program support capabilities. APF stands for Android Packet Filtering and it is a flexible
* way to drop unwanted network packets to save power.
*
* See documentation at hardware/google/apf/apf.h
*
* This class is immutable.
* @hide
*/
@SystemApi
public final class ApfCapabilities implements Parcelable {
private static ConnectivityResources sResources;
/**
* Version of APF instruction set supported for packet filtering. 0 indicates no support for
* packet filtering using APF programs.
*/
public final int apfVersionSupported;
/**
* Maximum size of APF program allowed.
*/
public final int maximumApfProgramSize;
/**
* Format of packets passed to APF filter. Should be one of ARPHRD_*
*/
public final int apfPacketFormat;
public ApfCapabilities(
int apfVersionSupported, int maximumApfProgramSize, int apfPacketFormat) {
this.apfVersionSupported = apfVersionSupported;
this.maximumApfProgramSize = maximumApfProgramSize;
this.apfPacketFormat = apfPacketFormat;
}
private ApfCapabilities(Parcel in) {
apfVersionSupported = in.readInt();
maximumApfProgramSize = in.readInt();
apfPacketFormat = in.readInt();
}
@NonNull
private static synchronized ConnectivityResources getResources(@NonNull Context ctx) {
if (sResources == null) {
sResources = new ConnectivityResources(ctx);
}
return sResources;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(apfVersionSupported);
dest.writeInt(maximumApfProgramSize);
dest.writeInt(apfPacketFormat);
}
public static final Creator<ApfCapabilities> CREATOR = new Creator<ApfCapabilities>() {
@Override
public ApfCapabilities createFromParcel(Parcel in) {
return new ApfCapabilities(in);
}
@Override
public ApfCapabilities[] newArray(int size) {
return new ApfCapabilities[size];
}
};
@NonNull
@Override
public String toString() {
return String.format("%s{version: %d, maxSize: %d, format: %d}", getClass().getSimpleName(),
apfVersionSupported, maximumApfProgramSize, apfPacketFormat);
}
@Override
public boolean equals(@Nullable Object obj) {
if (!(obj instanceof ApfCapabilities)) return false;
final ApfCapabilities other = (ApfCapabilities) obj;
return apfVersionSupported == other.apfVersionSupported
&& maximumApfProgramSize == other.maximumApfProgramSize
&& apfPacketFormat == other.apfPacketFormat;
}
/**
* Determines whether the APF interpreter advertises support for the data buffer access opcodes
* LDDW (LoaD Data Word) and STDW (STore Data Word). Full LDDW (LoaD Data Word) and
* STDW (STore Data Word) support is present from APFv4 on.
*
* @return {@code true} if the IWifiStaIface#readApfPacketFilterData is supported.
*/
public boolean hasDataAccess() {
return apfVersionSupported >= 4;
}
/**
* @return Whether the APF Filter in the device should filter out IEEE 802.3 Frames.
*/
public static boolean getApfDrop8023Frames() {
// TODO: deprecate/remove this method (now unused in the platform), as the resource was
// moved to NetworkStack.
final Resources systemRes = Resources.getSystem();
final int id = systemRes.getIdentifier("config_apfDrop802_3Frames", "bool", "android");
return systemRes.getBoolean(id);
}
/**
* @return An array of denylisted EtherType, packets with EtherTypes within it will be dropped.
*/
public static @NonNull int[] getApfEtherTypeBlackList() {
// TODO: deprecate/remove this method (now unused in the platform), as the resource was
// moved to NetworkStack.
final Resources systemRes = Resources.getSystem();
final int id = systemRes.getIdentifier("config_apfEthTypeBlackList", "array", "android");
return systemRes.getIntArray(id);
}
}
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