Hold wifi and mobile interfaces since boot in NetworkStatsService
In current design, the interface will be removed from the list if
the network disconnected which will cause getUidStatsForTransport()
returns unexpected snapshot to caller since the list is empty.
This change also remove interface name from all entries before
the method returns the result.
Ignore-AOSP-First: non-AOSP CL is included in the same topic
Bug: 231514741
Test: FrameworksNetTests
manual test
Change-Id: Ie60829a65d0d9b5b63ad353695a820c0586e3665
diff --git a/framework-t/src/android/net/NetworkStats.java b/framework-t/src/android/net/NetworkStats.java
index 51ff5ec..0bb98f8 100644
--- a/framework-t/src/android/net/NetworkStats.java
+++ b/framework-t/src/android/net/NetworkStats.java
@@ -1300,6 +1300,17 @@
}
/**
+ * Removes the interface name from all entries.
+ * This mutates the original structure in place.
+ * @hide
+ */
+ public void clearInterfaces() {
+ for (int i = 0; i < size; i++) {
+ iface[i] = null;
+ }
+ }
+
+ /**
* Only keep entries that match all specified filters.
*
* <p>This mutates the original structure in place. After this method is called,
diff --git a/service-t/src/com/android/server/net/NetworkStatsService.java b/service-t/src/com/android/server/net/NetworkStatsService.java
index a68f6b3..42a108f 100644
--- a/service-t/src/com/android/server/net/NetworkStatsService.java
+++ b/service-t/src/com/android/server/net/NetworkStatsService.java
@@ -25,6 +25,7 @@
import static android.content.Intent.ACTION_USER_REMOVED;
import static android.content.Intent.EXTRA_UID;
import static android.content.pm.PackageManager.PERMISSION_GRANTED;
+import static android.net.NetworkCapabilities.TRANSPORT_CELLULAR;
import static android.net.NetworkCapabilities.TRANSPORT_WIFI;
import static android.net.NetworkStats.DEFAULT_NETWORK_ALL;
import static android.net.NetworkStats.IFACE_ALL;
@@ -172,6 +173,7 @@
import java.util.List;
import java.util.Map;
import java.util.Objects;
+import java.util.Set;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.Executor;
import java.util.concurrent.Semaphore;
@@ -343,11 +345,16 @@
@GuardedBy("mStatsLock")
private String mActiveIface;
- /** Set of any ifaces associated with mobile networks since boot. */
+ /** Set of all ifaces currently associated with mobile networks. */
private volatile String[] mMobileIfaces = new String[0];
- /** Set of any ifaces associated with wifi networks since boot. */
- private volatile String[] mWifiIfaces = new String[0];
+ /* A set of all interfaces that have ever been associated with mobile networks since boot. */
+ @GuardedBy("mStatsLock")
+ private final Set<String> mAllMobileIfacesSinceBoot = new ArraySet<>();
+
+ /* A set of all interfaces that have ever been associated with wifi networks since boot. */
+ @GuardedBy("mStatsLock")
+ private final Set<String> mAllWifiIfacesSinceBoot = new ArraySet<>();
/** Set of all ifaces currently used by traffic that does not explicitly specify a Network. */
@GuardedBy("mStatsLock")
@@ -1564,17 +1571,37 @@
return dataLayer;
}
+ private String[] getAllIfacesSinceBoot(int transport) {
+ synchronized (mStatsLock) {
+ final Set<String> ifaceSet;
+ if (transport == TRANSPORT_WIFI) {
+ ifaceSet = mAllWifiIfacesSinceBoot;
+ } else if (transport == TRANSPORT_CELLULAR) {
+ ifaceSet = mAllMobileIfacesSinceBoot;
+ } else {
+ throw new IllegalArgumentException("Invalid transport " + transport);
+ }
+
+ return ifaceSet.toArray(new String[0]);
+ }
+ }
+
@Override
public NetworkStats getUidStatsForTransport(int transport) {
PermissionUtils.enforceNetworkStackPermission(mContext);
try {
- final String[] relevantIfaces =
- transport == TRANSPORT_WIFI ? mWifiIfaces : mMobileIfaces;
+ final String[] ifaceArray = getAllIfacesSinceBoot(transport);
// TODO(b/215633405) : mMobileIfaces and mWifiIfaces already contain the stacked
// interfaces, so this is not useful, remove it.
final String[] ifacesToQuery =
- mStatsFactory.augmentWithStackedInterfaces(relevantIfaces);
- return getNetworkStatsUidDetail(ifacesToQuery);
+ mStatsFactory.augmentWithStackedInterfaces(ifaceArray);
+ final NetworkStats stats = getNetworkStatsUidDetail(ifacesToQuery);
+ // Clear the interfaces of the stats before returning, so callers won't get this
+ // information. This is because no caller needs this information for now, and it
+ // makes it easier to change the implementation later by using the histories in the
+ // recorder.
+ stats.clearInterfaces();
+ return stats;
} catch (RemoteException e) {
Log.wtf(TAG, "Error compiling UID stats", e);
return new NetworkStats(0L, 0);
@@ -1955,7 +1982,6 @@
final boolean combineSubtypeEnabled = mSettings.getCombineSubtypeEnabled();
final ArraySet<String> mobileIfaces = new ArraySet<>();
- final ArraySet<String> wifiIfaces = new ArraySet<>();
for (NetworkStateSnapshot snapshot : snapshots) {
final int displayTransport =
getDisplayTransport(snapshot.getNetworkCapabilities().getTransportTypes());
@@ -2000,9 +2026,12 @@
if (isMobile) {
mobileIfaces.add(baseIface);
+ // If the interface name was present in the wifi set, the interface won't
+ // be removed from it to prevent stats from getting rollback.
+ mAllMobileIfacesSinceBoot.add(baseIface);
}
if (isWifi) {
- wifiIfaces.add(baseIface);
+ mAllWifiIfacesSinceBoot.add(baseIface);
}
}
@@ -2044,9 +2073,10 @@
findOrCreateNetworkIdentitySet(mActiveUidIfaces, iface).add(ident);
if (isMobile) {
mobileIfaces.add(iface);
+ mAllMobileIfacesSinceBoot.add(iface);
}
if (isWifi) {
- wifiIfaces.add(iface);
+ mAllWifiIfacesSinceBoot.add(iface);
}
mStatsFactory.noteStackedIface(iface, baseIface);
@@ -2055,16 +2085,11 @@
}
mMobileIfaces = mobileIfaces.toArray(new String[0]);
- mWifiIfaces = wifiIfaces.toArray(new String[0]);
// TODO (b/192758557): Remove debug log.
if (CollectionUtils.contains(mMobileIfaces, null)) {
throw new NullPointerException(
"null element in mMobileIfaces: " + Arrays.toString(mMobileIfaces));
}
- if (CollectionUtils.contains(mWifiIfaces, null)) {
- throw new NullPointerException(
- "null element in mWifiIfaces: " + Arrays.toString(mWifiIfaces));
- }
}
private static int getSubIdForMobile(@NonNull NetworkStateSnapshot state) {
@@ -2532,6 +2557,22 @@
}
pw.decreaseIndent();
+ pw.println("All wifi interfaces:");
+ pw.increaseIndent();
+ for (String iface : mAllWifiIfacesSinceBoot) {
+ pw.print(iface + " ");
+ }
+ pw.println();
+ pw.decreaseIndent();
+
+ pw.println("All mobile interfaces:");
+ pw.increaseIndent();
+ for (String iface : mAllMobileIfacesSinceBoot) {
+ pw.print(iface + " ");
+ }
+ pw.println();
+ pw.decreaseIndent();
+
// Get the top openSession callers
final HashMap calls;
synchronized (mOpenSessionCallsLock) {
diff --git a/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java b/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java
index 9293e5c..cc9c014 100644
--- a/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java
+++ b/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java
@@ -1180,9 +1180,12 @@
assertEquals(3, stats.size());
entry1.operations = 1;
+ entry1.iface = null;
assertEquals(entry1, stats.getValues(0, null));
entry2.operations = 1;
+ entry2.iface = null;
assertEquals(entry2, stats.getValues(1, null));
+ entry3.iface = null;
assertEquals(entry3, stats.getValues(2, null));
}