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/*
* Copyright (C) 2014 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 com.android.server.connectivity;
import android.content.Context;
import android.net.LinkProperties;
import android.net.Network;
import android.net.NetworkCapabilities;
import android.net.NetworkInfo;
import android.net.NetworkMisc;
import android.net.NetworkRequest;
import android.os.Handler;
import android.os.Messenger;
import android.util.SparseArray;
import com.android.internal.util.AsyncChannel;
import com.android.server.connectivity.NetworkMonitor;
import java.util.ArrayList;
/**
* A bag class used by ConnectivityService for holding a collection of most recent
* information published by a particular NetworkAgent as well as the
* AsyncChannel/messenger for reaching that NetworkAgent and lists of NetworkRequests
* interested in using it.
*/
public class NetworkAgentInfo {
public NetworkInfo networkInfo;
// This Network object should always be used if possible, so as to encourage reuse of the
// enclosed socket factory and connection pool. Avoid creating other Network objects.
// This Network object is always valid.
public final Network network;
public LinkProperties linkProperties;
public NetworkCapabilities networkCapabilities;
public final NetworkMonitor networkMonitor;
public final NetworkMisc networkMisc;
// Indicates if netd has been told to create this Network. Once created the appropriate routing
// rules are setup and routes are added so packets can begin flowing over the Network.
// NOTE: This is a sticky bit; once set it is never cleared.
public boolean created;
// Set to true if this Network successfully passed validation or if it did not satisfy the
// default NetworkRequest in which case validation will not be attempted.
// NOTE: This is a sticky bit; once set it is never cleared even if future validation attempts
// fail.
public boolean everValidated;
// The result of the last validation attempt on this network (true if validated, false if not).
// This bit exists only because we never unvalidate a network once it's been validated, and that
// is because the network scoring and revalidation code does not (may not?) deal properly with
// networks becoming unvalidated.
// TODO: Fix the network scoring code, remove this, and rename everValidated to validated.
public boolean lastValidated;
// This represents the last score received from the NetworkAgent.
private int currentScore;
// Penalty applied to scores of Networks that have not been validated.
private static final int UNVALIDATED_SCORE_PENALTY = 40;
// Score for explicitly connected network.
private static final int EXPLICITLY_SELECTED_NETWORK_SCORE = 100;
// The list of NetworkRequests being satisfied by this Network.
public final SparseArray<NetworkRequest> networkRequests = new SparseArray<NetworkRequest>();
// The list of NetworkRequests that this Network previously satisfied with the highest
// score. A non-empty list indicates that if this Network was validated it is lingered.
// NOTE: This list is only used for debugging.
public final ArrayList<NetworkRequest> networkLingered = new ArrayList<NetworkRequest>();
public final Messenger messenger;
public final AsyncChannel asyncChannel;
// Used by ConnectivityService to keep track of 464xlat.
public Nat464Xlat clatd;
public NetworkAgentInfo(Messenger messenger, AsyncChannel ac, Network net, NetworkInfo info,
LinkProperties lp, NetworkCapabilities nc, int score, Context context, Handler handler,
NetworkMisc misc, NetworkRequest defaultRequest) {
this.messenger = messenger;
asyncChannel = ac;
network = net;
networkInfo = info;
linkProperties = lp;
networkCapabilities = nc;
currentScore = score;
networkMonitor = new NetworkMonitor(context, handler, this, defaultRequest);
networkMisc = misc;
created = false;
everValidated = false;
lastValidated = false;
}
public void addRequest(NetworkRequest networkRequest) {
networkRequests.put(networkRequest.requestId, networkRequest);
}
// Does this network satisfy request?
public boolean satisfies(NetworkRequest request) {
return created &&
request.networkCapabilities.satisfiedByNetworkCapabilities(networkCapabilities);
}
public boolean isVPN() {
return networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_VPN);
}
private int getCurrentScore(boolean pretendValidated) {
// TODO: We may want to refactor this into a NetworkScore class that takes a base score from
// the NetworkAgent and signals from the NetworkAgent and uses those signals to modify the
// score. The NetworkScore class would provide a nice place to centralize score constants
// so they are not scattered about the transports.
int score = currentScore;
if (!everValidated && !pretendValidated) score -= UNVALIDATED_SCORE_PENALTY;
if (score < 0) score = 0;
if (networkMisc.explicitlySelected) score = EXPLICITLY_SELECTED_NETWORK_SCORE;
return score;
}
// Get the current score for this Network. This may be modified from what the
// NetworkAgent sent, as it has modifiers applied to it.
public int getCurrentScore() {
return getCurrentScore(false);
}
// Get the current score for this Network as if it was validated. This may be modified from
// what the NetworkAgent sent, as it has modifiers applied to it.
public int getCurrentScoreAsValidated() {
return getCurrentScore(true);
}
public void setCurrentScore(int newScore) {
currentScore = newScore;
}
public String toString() {
return "NetworkAgentInfo{ ni{" + networkInfo + "} network{" +
network + "} lp{" +
linkProperties + "} nc{" +
networkCapabilities + "} Score{" + getCurrentScore() + "} " +
"everValidated{" + everValidated + "} lastValidated{" + lastValidated + "} " +
"created{" + created + "} " +
"explicitlySelected{" + networkMisc.explicitlySelected + "} }";
}
public String name() {
return "NetworkAgentInfo [" + networkInfo.getTypeName() + " (" +
networkInfo.getSubtypeName() + ") - " +
(network == null ? "null" : network.toString()) + "]";
}
}
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