Always check off-link connectivity in NetworkDiagnostics.
Currently, NetworkDiagnostics only checks off-link connectivity if
one of the DNS servers is off-link. Make it check off-link
connectivity in all cases by sending probes to Google Public DNS
if off-link DNS servers are not specified.
Bug: 22569331
Bug: 22641669
Bug: 22748900
Change-Id: I6cb0dd8491bc0c1a488631deca56722b9c1d2b3f
diff --git a/core/java/android/net/LinkProperties.java b/core/java/android/net/LinkProperties.java
index cfd5bf1..c4de4a2 100644
--- a/core/java/android/net/LinkProperties.java
+++ b/core/java/android/net/LinkProperties.java
@@ -662,6 +662,17 @@
}
/**
+ * Returns true if this link or any of its stacked interfaces has an IPv4 address.
+ *
+ * @return {@code true} if there is an IPv4 address, {@code false} otherwise.
+ */
+ private boolean hasIPv4AddressOnInterface(String iface) {
+ return (mIfaceName.equals(iface) && hasIPv4Address()) ||
+ (iface != null && mStackedLinks.containsKey(iface) &&
+ mStackedLinks.get(iface).hasIPv4Address());
+ }
+
+ /**
* Returns true if this link has a global preferred IPv6 address.
*
* @return {@code true} if there is a global preferred IPv6 address, {@code false} otherwise.
@@ -792,7 +803,7 @@
if (ip instanceof Inet4Address) {
// For IPv4, it suffices for now to simply have any address.
- return hasIPv4Address();
+ return hasIPv4AddressOnInterface(bestRoute.getInterface());
} else if (ip instanceof Inet6Address) {
if (ip.isLinkLocalAddress()) {
// For now, just make sure link-local destinations have
diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index eb74ab0..76d2258 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -1772,7 +1772,7 @@
// Start gathering diagnostic information.
netDiags.add(new NetworkDiagnostics(
nai.network,
- new LinkProperties(nai.linkProperties),
+ new LinkProperties(nai.linkProperties), // Must be a copy.
DIAG_TIME_MS));
}
diff --git a/services/core/java/com/android/server/connectivity/NetworkDiagnostics.java b/services/core/java/com/android/server/connectivity/NetworkDiagnostics.java
index 74ba404..aca6991 100644
--- a/services/core/java/com/android/server/connectivity/NetworkDiagnostics.java
+++ b/services/core/java/com/android/server/connectivity/NetworkDiagnostics.java
@@ -20,6 +20,7 @@
import android.net.LinkProperties;
import android.net.Network;
+import android.net.NetworkUtils;
import android.net.RouteInfo;
import android.os.SystemClock;
import android.system.ErrnoException;
@@ -79,6 +80,10 @@
public class NetworkDiagnostics {
private static final String TAG = "NetworkDiagnostics";
+ private static final InetAddress TEST_DNS4 = NetworkUtils.numericToInetAddress("8.8.8.8");
+ private static final InetAddress TEST_DNS6 = NetworkUtils.numericToInetAddress(
+ "2001:4860:4860::8888");
+
// For brevity elsewhere.
private static final long now() {
return SystemClock.elapsedRealtime();
@@ -156,6 +161,21 @@
mStartTime = now();
mDeadlineTime = mStartTime + mTimeoutMs;
+ // Hardcode measurements to TEST_DNS4 and TEST_DNS6 in order to test off-link connectivity.
+ // We are free to modify mLinkProperties with impunity because ConnectivityService passes us
+ // a copy and not the original object. It's easier to do it this way because we don't need
+ // to check whether the LinkProperties already contains these DNS servers because
+ // LinkProperties#addDnsServer checks for duplicates.
+ if (mLinkProperties.isReachable(TEST_DNS4)) {
+ mLinkProperties.addDnsServer(TEST_DNS4);
+ }
+ // TODO: we could use mLinkProperties.isReachable(TEST_DNS6) here, because we won't set any
+ // DNS servers for which isReachable() is false, but since this is diagnostic code, be extra
+ // careful.
+ if (mLinkProperties.hasGlobalIPv6Address() || mLinkProperties.hasIPv6DefaultRoute()) {
+ mLinkProperties.addDnsServer(TEST_DNS6);
+ }
+
for (RouteInfo route : mLinkProperties.getRoutes()) {
if (route.hasGateway()) {
prepareIcmpMeasurement(route.getGateway());