[Tether05] Migrate UpstreamNetworkMonitor into module
Bug: 136040414
Test: -build, flash, boot
-atest TetheringTests
-atest FrameworksNetTests
Change-Id: Ic1d9deecb66aaba0a4264a57f2e6579ea491ac9b
diff --git a/Tethering/src/android/net/util/PrefixUtils.java b/Tethering/src/android/net/util/PrefixUtils.java
new file mode 100644
index 0000000..f203e99
--- /dev/null
+++ b/Tethering/src/android/net/util/PrefixUtils.java
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2017 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 android.net.util;
+
+import android.net.IpPrefix;
+import android.net.LinkAddress;
+import android.net.LinkProperties;
+
+import java.net.Inet4Address;
+import java.net.InetAddress;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+
+/**
+ * @hide
+ */
+public class PrefixUtils {
+ private static final IpPrefix[] MIN_NON_FORWARDABLE_PREFIXES = {
+ pfx("127.0.0.0/8"), // IPv4 loopback
+ pfx("169.254.0.0/16"), // IPv4 link-local, RFC3927#section-8
+ pfx("::/3"),
+ pfx("fe80::/64"), // IPv6 link-local
+ pfx("fc00::/7"), // IPv6 ULA
+ pfx("ff02::/8"), // IPv6 link-local multicast
+ };
+
+ public static final IpPrefix DEFAULT_WIFI_P2P_PREFIX = pfx("192.168.49.0/24");
+
+ /** Get non forwardable prefixes. */
+ public static Set<IpPrefix> getNonForwardablePrefixes() {
+ final HashSet<IpPrefix> prefixes = new HashSet<>();
+ addNonForwardablePrefixes(prefixes);
+ return prefixes;
+ }
+
+ /** Add non forwardable prefixes. */
+ public static void addNonForwardablePrefixes(Set<IpPrefix> prefixes) {
+ Collections.addAll(prefixes, MIN_NON_FORWARDABLE_PREFIXES);
+ }
+
+ /** Get local prefixes from |lp|. */
+ public static Set<IpPrefix> localPrefixesFrom(LinkProperties lp) {
+ final HashSet<IpPrefix> localPrefixes = new HashSet<>();
+ if (lp == null) return localPrefixes;
+
+ for (LinkAddress addr : lp.getAllLinkAddresses()) {
+ if (addr.getAddress().isLinkLocalAddress()) continue;
+ localPrefixes.add(asIpPrefix(addr));
+ }
+ // TODO: Add directly-connected routes as well (ones from which we did
+ // not also form a LinkAddress)?
+
+ return localPrefixes;
+ }
+
+ /** Convert LinkAddress |addr| to IpPrefix. */
+ public static IpPrefix asIpPrefix(LinkAddress addr) {
+ return new IpPrefix(addr.getAddress(), addr.getPrefixLength());
+ }
+
+ /** Convert InetAddress |ip| to IpPrefix. */
+ public static IpPrefix ipAddressAsPrefix(InetAddress ip) {
+ final int bitLength = (ip instanceof Inet4Address)
+ ? NetworkConstants.IPV4_ADDR_BITS
+ : NetworkConstants.IPV6_ADDR_BITS;
+ return new IpPrefix(ip, bitLength);
+ }
+
+ private static IpPrefix pfx(String prefixStr) {
+ return new IpPrefix(prefixStr);
+ }
+}