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-rw-r--r--core/java/android/net/LinkProperties.java70
-rw-r--r--core/tests/coretests/src/android/net/LinkPropertiesTest.java77
2 files changed, 140 insertions, 7 deletions
diff --git a/core/java/android/net/LinkProperties.java b/core/java/android/net/LinkProperties.java
index 8b0dfc95fef0..31aedad77116 100644
--- a/core/java/android/net/LinkProperties.java
+++ b/core/java/android/net/LinkProperties.java
@@ -88,6 +88,54 @@ public final class LinkProperties implements Parcelable {
/**
* @hide
*/
+ public enum ProvisioningChange {
+ STILL_NOT_PROVISIONED,
+ LOST_PROVISIONING,
+ GAINED_PROVISIONING,
+ STILL_PROVISIONED,
+ }
+
+ /**
+ * Compare the provisioning states of two LinkProperties instances.
+ *
+ * @hide
+ */
+ public static ProvisioningChange compareProvisioning(
+ LinkProperties before, LinkProperties after) {
+ if (before.isProvisioned() && after.isProvisioned()) {
+ // On dualstack networks, DHCPv4 renewals can occasionally fail.
+ // When this happens, IPv6-reachable services continue to function
+ // normally but IPv4-only services (naturally) fail.
+ //
+ // When an application using an IPv4-only service reports a bad
+ // network condition to the framework, attempts to re-validate
+ // the network succeed (since we support IPv6-only networks) and
+ // nothing is changed.
+ //
+ // For users, this is confusing and unexpected behaviour, and is
+ // not necessarily easy to diagnose. Therefore, we treat changing
+ // from a dualstack network to an IPv6-only network equivalent to
+ // a total loss of provisioning.
+ //
+ // For one such example of this, see b/18867306.
+ //
+ // TODO: Remove this special case altogether.
+ if (before.isIPv4Provisioned() && !after.isIPv4Provisioned()) {
+ return ProvisioningChange.LOST_PROVISIONING;
+ }
+ return ProvisioningChange.STILL_PROVISIONED;
+ } else if (before.isProvisioned() && !after.isProvisioned()) {
+ return ProvisioningChange.LOST_PROVISIONING;
+ } else if (!before.isProvisioned() && after.isProvisioned()) {
+ return ProvisioningChange.GAINED_PROVISIONING;
+ } else { // !before.isProvisioned() && !after.isProvisioned()
+ return ProvisioningChange.STILL_NOT_PROVISIONED;
+ }
+ }
+
+ /**
+ * @hide
+ */
public LinkProperties() {
}
@@ -287,6 +335,20 @@ public final class LinkProperties implements Parcelable {
}
/**
+ * Removes the given {@link InetAddress} from the list of DNS servers.
+ *
+ * @param dnsServer The {@link InetAddress} to remove from the list of DNS servers.
+ * @return true if the DNS server was removed, false if it did not exist.
+ * @hide
+ */
+ public boolean removeDnsServer(InetAddress dnsServer) {
+ if (dnsServer != null) {
+ return mDnses.remove(dnsServer);
+ }
+ return false;
+ }
+
+ /**
* Replaces the DNS servers in this {@code LinkProperties} with
* the given {@link Collection} of {@link InetAddress} objects.
*
@@ -679,8 +741,9 @@ public final class LinkProperties implements Parcelable {
* This requires an IP address, default route, and DNS server.
*
* @return {@code true} if the link is provisioned, {@code false} otherwise.
+ * @hide
*/
- private boolean hasIPv4() {
+ public boolean isIPv4Provisioned() {
return (hasIPv4Address() &&
hasIPv4DefaultRoute() &&
hasIPv4DnsServer());
@@ -691,8 +754,9 @@ public final class LinkProperties implements Parcelable {
* This requires an IP address, default route, and DNS server.
*
* @return {@code true} if the link is provisioned, {@code false} otherwise.
+ * @hide
*/
- private boolean hasIPv6() {
+ public boolean isIPv6Provisioned() {
return (hasGlobalIPv6Address() &&
hasIPv6DefaultRoute() &&
hasIPv6DnsServer());
@@ -706,7 +770,7 @@ public final class LinkProperties implements Parcelable {
* @hide
*/
public boolean isProvisioned() {
- return (hasIPv4() || hasIPv6());
+ return (isIPv4Provisioned() || isIPv6Provisioned());
}
/**
diff --git a/core/tests/coretests/src/android/net/LinkPropertiesTest.java b/core/tests/coretests/src/android/net/LinkPropertiesTest.java
index abfed6e6f89a..5c55efb837fa 100644
--- a/core/tests/coretests/src/android/net/LinkPropertiesTest.java
+++ b/core/tests/coretests/src/android/net/LinkPropertiesTest.java
@@ -17,6 +17,7 @@
package android.net;
import android.net.LinkProperties;
+import android.net.LinkProperties.ProvisioningChange;
import android.net.RouteInfo;
import android.system.OsConstants;
import android.test.suitebuilder.annotation.SmallTest;
@@ -34,7 +35,8 @@ public class LinkPropertiesTest extends TestCase {
private static InetAddress DNS6 = NetworkUtils.numericToInetAddress("2001:4860:4860::8888");
private static InetAddress GATEWAY1 = NetworkUtils.numericToInetAddress("75.208.8.1");
private static InetAddress GATEWAY2 = NetworkUtils.numericToInetAddress("69.78.8.1");
- private static InetAddress GATEWAY6 = NetworkUtils.numericToInetAddress("fe80::6:0000:613");
+ private static InetAddress GATEWAY61 = NetworkUtils.numericToInetAddress("fe80::6:0000:613");
+ private static InetAddress GATEWAY62 = NetworkUtils.numericToInetAddress("fe80::6:2222");
private static String NAME = "qmi0";
private static int MTU = 1500;
@@ -466,6 +468,8 @@ public class LinkPropertiesTest extends TestCase {
assertFalse("v4only:addr+dns", lp4.isProvisioned());
lp4.addRoute(new RouteInfo(GATEWAY1));
assertTrue("v4only:addr+dns+route", lp4.isProvisioned());
+ assertTrue("v4only:addr+dns+route", lp4.isIPv4Provisioned());
+ assertFalse("v4only:addr+dns+route", lp4.isIPv6Provisioned());
LinkProperties lp6 = new LinkProperties();
assertFalse("v6only:empty", lp6.isProvisioned());
@@ -473,11 +477,14 @@ public class LinkPropertiesTest extends TestCase {
assertFalse("v6only:fe80-only", lp6.isProvisioned());
lp6.addDnsServer(DNS6);
assertFalse("v6only:fe80+dns", lp6.isProvisioned());
- lp6.addRoute(new RouteInfo(GATEWAY6));
+ lp6.addRoute(new RouteInfo(GATEWAY61));
assertFalse("v6only:fe80+dns+route", lp6.isProvisioned());
lp6.addLinkAddress(LINKADDRV6);
+ assertTrue("v6only:fe80+global+dns+route", lp6.isIPv6Provisioned());
assertTrue("v6only:fe80+global+dns+route", lp6.isProvisioned());
lp6.removeLinkAddress(LINKADDRV6LINKLOCAL);
+ assertFalse("v6only:global+dns+route", lp6.isIPv4Provisioned());
+ assertTrue("v6only:global+dns+route", lp6.isIPv6Provisioned());
assertTrue("v6only:global+dns+route", lp6.isProvisioned());
LinkProperties lp46 = new LinkProperties();
@@ -487,15 +494,77 @@ public class LinkPropertiesTest extends TestCase {
lp46.addDnsServer(DNS6);
assertFalse("dualstack:missing-routes", lp46.isProvisioned());
lp46.addRoute(new RouteInfo(GATEWAY1));
+ assertTrue("dualstack:v4-provisioned", lp46.isIPv4Provisioned());
+ assertFalse("dualstack:v4-provisioned", lp46.isIPv6Provisioned());
assertTrue("dualstack:v4-provisioned", lp46.isProvisioned());
- lp6.addRoute(new RouteInfo(GATEWAY6));
+ lp46.addRoute(new RouteInfo(GATEWAY61));
+ assertTrue("dualstack:both-provisioned", lp46.isIPv4Provisioned());
+ assertTrue("dualstack:both-provisioned", lp46.isIPv6Provisioned());
assertTrue("dualstack:both-provisioned", lp46.isProvisioned());
// A link with an IPv6 address and default route, but IPv4 DNS server.
LinkProperties mixed = new LinkProperties();
mixed.addLinkAddress(LINKADDRV6);
mixed.addDnsServer(DNS1);
- mixed.addRoute(new RouteInfo(GATEWAY6));
+ mixed.addRoute(new RouteInfo(GATEWAY61));
+ assertFalse("mixed:addr6+route6+dns4", mixed.isIPv4Provisioned());
+ assertFalse("mixed:addr6+route6+dns4", mixed.isIPv6Provisioned());
assertFalse("mixed:addr6+route6+dns4", mixed.isProvisioned());
}
+
+ @SmallTest
+ public void testCompareProvisioning() {
+ LinkProperties v4lp = new LinkProperties();
+ v4lp.addLinkAddress(LINKADDRV4);
+ v4lp.addRoute(new RouteInfo(GATEWAY1));
+ v4lp.addDnsServer(DNS1);
+ assertTrue(v4lp.isProvisioned());
+
+ LinkProperties v4r = new LinkProperties(v4lp);
+ v4r.removeDnsServer(DNS1);
+ assertFalse(v4r.isProvisioned());
+
+ assertEquals(ProvisioningChange.STILL_NOT_PROVISIONED,
+ LinkProperties.compareProvisioning(v4r, v4r));
+ assertEquals(ProvisioningChange.LOST_PROVISIONING,
+ LinkProperties.compareProvisioning(v4lp, v4r));
+ assertEquals(ProvisioningChange.GAINED_PROVISIONING,
+ LinkProperties.compareProvisioning(v4r, v4lp));
+ assertEquals(ProvisioningChange.STILL_PROVISIONED,
+ LinkProperties.compareProvisioning(v4lp, v4lp));
+
+ // Check that losing IPv4 provisioning on a dualstack network is
+ // seen as a total loss of provisioning.
+ LinkProperties v6lp = new LinkProperties();
+ v6lp.addLinkAddress(LINKADDRV6);
+ v6lp.addRoute(new RouteInfo(GATEWAY61));
+ v6lp.addDnsServer(DNS6);
+ assertFalse(v6lp.isIPv4Provisioned());
+ assertTrue(v6lp.isIPv6Provisioned());
+ assertTrue(v6lp.isProvisioned());
+
+ LinkProperties v46lp = new LinkProperties(v6lp);
+ v46lp.addLinkAddress(LINKADDRV4);
+ v46lp.addRoute(new RouteInfo(GATEWAY1));
+ v46lp.addDnsServer(DNS1);
+ assertTrue(v46lp.isIPv4Provisioned());
+ assertTrue(v46lp.isIPv6Provisioned());
+ assertTrue(v46lp.isProvisioned());
+
+ assertEquals(ProvisioningChange.STILL_PROVISIONED,
+ LinkProperties.compareProvisioning(v6lp, v46lp));
+ assertEquals(ProvisioningChange.LOST_PROVISIONING,
+ LinkProperties.compareProvisioning(v46lp, v6lp));
+
+ // Check that losing and gaining a secondary router does not change
+ // the provisioning status.
+ LinkProperties v6lp2 = new LinkProperties(v6lp);
+ v6lp2.addRoute(new RouteInfo(GATEWAY62));
+ assertTrue(v6lp2.isProvisioned());
+
+ assertEquals(ProvisioningChange.STILL_PROVISIONED,
+ LinkProperties.compareProvisioning(v6lp2, v6lp));
+ assertEquals(ProvisioningChange.STILL_PROVISIONED,
+ LinkProperties.compareProvisioning(v6lp, v6lp2));
+ }
}
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2025-11-11 04:34:31 +0000