Fix NOT_RESTRICTED network capability and enforce it.
With this change:
1. NOT_RESTRICTED should be removed from NetworkRequests that bring up
special restricted carrier networks (e.g. IMS, FOTA).
2. NetworkRequests without NOT_RESTRICTED require CONNECTIVITY_INTERNAL
permission to register
3. Binding sockets to networks without NOT_RESTRICTED requires
CONNECTIVITY_INTERNAL permission
Bug:21637535
Change-Id: I5991d39facaa6b690e969fe15dcbeec52e918321
diff --git a/core/java/android/net/ConnectivityManager.java b/core/java/android/net/ConnectivityManager.java
index dc8ff8f..4d45076 100644
--- a/core/java/android/net/ConnectivityManager.java
+++ b/core/java/android/net/ConnectivityManager.java
@@ -956,41 +956,6 @@
return 1;
}
- /**
- * Removes the NET_CAPABILITY_NOT_RESTRICTED capability from the given
- * NetworkCapabilities object if all the capabilities it provides are
- * typically provided by restricted networks.
- *
- * TODO: consider:
- * - Moving to NetworkCapabilities
- * - Renaming it to guessRestrictedCapability and make it set the
- * restricted capability bit in addition to clearing it.
- * @hide
- */
- public static void maybeMarkCapabilitiesRestricted(NetworkCapabilities nc) {
- for (int capability : nc.getCapabilities()) {
- switch (capability) {
- case NetworkCapabilities.NET_CAPABILITY_CBS:
- case NetworkCapabilities.NET_CAPABILITY_DUN:
- case NetworkCapabilities.NET_CAPABILITY_EIMS:
- case NetworkCapabilities.NET_CAPABILITY_FOTA:
- case NetworkCapabilities.NET_CAPABILITY_IA:
- case NetworkCapabilities.NET_CAPABILITY_IMS:
- case NetworkCapabilities.NET_CAPABILITY_RCS:
- case NetworkCapabilities.NET_CAPABILITY_XCAP:
- case NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED: //there by default
- continue;
- default:
- // At least one capability usually provided by unrestricted
- // networks. Conclude that this network is unrestricted.
- return;
- }
- }
- // All the capabilities are typically provided by restricted networks.
- // Conclude that this network is restricted.
- nc.removeCapability(NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED);
- }
-
private NetworkCapabilities networkCapabilitiesForFeature(int networkType, String feature) {
if (networkType == TYPE_MOBILE) {
int cap = -1;
@@ -1013,14 +978,14 @@
}
NetworkCapabilities netCap = new NetworkCapabilities();
netCap.addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR).addCapability(cap);
- maybeMarkCapabilitiesRestricted(netCap);
+ netCap.maybeMarkCapabilitiesRestricted();
return netCap;
} else if (networkType == TYPE_WIFI) {
if ("p2p".equals(feature)) {
NetworkCapabilities netCap = new NetworkCapabilities();
netCap.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);
netCap.addCapability(NetworkCapabilities.NET_CAPABILITY_WIFI_P2P);
- maybeMarkCapabilitiesRestricted(netCap);
+ netCap.maybeMarkCapabilitiesRestricted();
return netCap;
}
}
diff --git a/core/java/android/net/NetworkCapabilities.java b/core/java/android/net/NetworkCapabilities.java
index 514d24a..0154eb5 100644
--- a/core/java/android/net/NetworkCapabilities.java
+++ b/core/java/android/net/NetworkCapabilities.java
@@ -38,10 +38,7 @@
*/
public NetworkCapabilities() {
clearAll();
- mNetworkCapabilities =
- (1 << NET_CAPABILITY_NOT_RESTRICTED) |
- (1 << NET_CAPABILITY_TRUSTED) |
- (1 << NET_CAPABILITY_NOT_VPN);
+ mNetworkCapabilities = DEFAULT_CAPABILITIES;
}
public NetworkCapabilities(NetworkCapabilities nc) {
@@ -187,6 +184,28 @@
private static final int MAX_NET_CAPABILITY = NET_CAPABILITY_CAPTIVE_PORTAL;
/**
+ * Capabilities that are set by default when the object is constructed.
+ */
+ private static final long DEFAULT_CAPABILITIES =
+ (1 << NET_CAPABILITY_NOT_RESTRICTED) |
+ (1 << NET_CAPABILITY_TRUSTED) |
+ (1 << NET_CAPABILITY_NOT_VPN);
+
+ /**
+ * Capabilities that suggest that a network is restricted.
+ * {@see #maybeMarkCapabilitiesRestricted}.
+ */
+ private static final long RESTRICTED_CAPABILITIES =
+ (1 << NET_CAPABILITY_CBS) |
+ (1 << NET_CAPABILITY_DUN) |
+ (1 << NET_CAPABILITY_EIMS) |
+ (1 << NET_CAPABILITY_FOTA) |
+ (1 << NET_CAPABILITY_IA) |
+ (1 << NET_CAPABILITY_IMS) |
+ (1 << NET_CAPABILITY_RCS) |
+ (1 << NET_CAPABILITY_XCAP);
+
+ /**
* Adds the given capability to this {@code NetworkCapability} instance.
* Multiple capabilities may be applied sequentially. Note that when searching
* for a network to satisfy a request, all capabilities requested must be satisfied.
@@ -269,6 +288,22 @@
}
/**
+ * Removes the NET_CAPABILITY_NOT_RESTRICTED capability if all the capabilities it provides are
+ * typically provided by restricted networks.
+ *
+ * TODO: consider:
+ * - Renaming it to guessRestrictedCapability and make it set the
+ * restricted capability bit in addition to clearing it.
+ * @hide
+ */
+ public void maybeMarkCapabilitiesRestricted() {
+ // If all the capabilities are typically provided by restricted networks, conclude that this
+ // network is restricted.
+ if ((mNetworkCapabilities & ~(DEFAULT_CAPABILITIES | RESTRICTED_CAPABILITIES)) == 0)
+ removeCapability(NET_CAPABILITY_NOT_RESTRICTED);
+ }
+
+ /**
* Representing the transport type. Apps should generally not care about transport. A
* request for a fast internet connection could be satisfied by a number of different
* transports. If any are specified here it will be satisfied a Network that matches
diff --git a/core/java/android/net/NetworkRequest.java b/core/java/android/net/NetworkRequest.java
index e61594c..e184ec4 100644
--- a/core/java/android/net/NetworkRequest.java
+++ b/core/java/android/net/NetworkRequest.java
@@ -83,7 +83,13 @@
* Build {@link NetworkRequest} give the current set of capabilities.
*/
public NetworkRequest build() {
- return new NetworkRequest(mNetworkCapabilities, ConnectivityManager.TYPE_NONE,
+ // Make a copy of mNetworkCapabilities so we don't inadvertently remove NOT_RESTRICTED
+ // when later an unrestricted capability could be added to mNetworkCapabilities, in
+ // which case NOT_RESTRICTED should be returned to mNetworkCapabilities, which
+ // maybeMarkCapabilitiesRestricted() doesn't add back.
+ final NetworkCapabilities nc = new NetworkCapabilities(mNetworkCapabilities);
+ nc.maybeMarkCapabilitiesRestricted();
+ return new NetworkRequest(nc, ConnectivityManager.TYPE_NONE,
ConnectivityManager.REQUEST_ID_UNSET);
}