f11a5da0d5
Bug: 136040414
Test: -build, flash, boot
-atest TetheringTests
-atest FrameworksNetTests
Change-Id: Ic1d9deecb66aaba0a4264a57f2e6579ea491ac9b
89 lines
2.9 KiB
Java
89 lines
2.9 KiB
Java
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.net.util;
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import android.net.IpPrefix;
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import android.net.LinkAddress;
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import android.net.LinkProperties;
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import java.net.Inet4Address;
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import java.net.InetAddress;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.Set;
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/**
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* @hide
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*/
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public class PrefixUtils {
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private static final IpPrefix[] MIN_NON_FORWARDABLE_PREFIXES = {
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pfx("127.0.0.0/8"), // IPv4 loopback
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pfx("169.254.0.0/16"), // IPv4 link-local, RFC3927#section-8
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pfx("::/3"),
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pfx("fe80::/64"), // IPv6 link-local
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pfx("fc00::/7"), // IPv6 ULA
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pfx("ff02::/8"), // IPv6 link-local multicast
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};
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public static final IpPrefix DEFAULT_WIFI_P2P_PREFIX = pfx("192.168.49.0/24");
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/** Get non forwardable prefixes. */
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public static Set<IpPrefix> getNonForwardablePrefixes() {
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final HashSet<IpPrefix> prefixes = new HashSet<>();
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addNonForwardablePrefixes(prefixes);
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return prefixes;
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}
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/** Add non forwardable prefixes. */
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public static void addNonForwardablePrefixes(Set<IpPrefix> prefixes) {
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Collections.addAll(prefixes, MIN_NON_FORWARDABLE_PREFIXES);
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}
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/** Get local prefixes from |lp|. */
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public static Set<IpPrefix> localPrefixesFrom(LinkProperties lp) {
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final HashSet<IpPrefix> localPrefixes = new HashSet<>();
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if (lp == null) return localPrefixes;
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for (LinkAddress addr : lp.getAllLinkAddresses()) {
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if (addr.getAddress().isLinkLocalAddress()) continue;
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localPrefixes.add(asIpPrefix(addr));
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}
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// TODO: Add directly-connected routes as well (ones from which we did
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// not also form a LinkAddress)?
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return localPrefixes;
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}
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/** Convert LinkAddress |addr| to IpPrefix. */
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public static IpPrefix asIpPrefix(LinkAddress addr) {
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return new IpPrefix(addr.getAddress(), addr.getPrefixLength());
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}
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/** Convert InetAddress |ip| to IpPrefix. */
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public static IpPrefix ipAddressAsPrefix(InetAddress ip) {
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final int bitLength = (ip instanceof Inet4Address)
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? NetworkConstants.IPV4_ADDR_BITS
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: NetworkConstants.IPV6_ADDR_BITS;
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return new IpPrefix(ip, bitLength);
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}
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private static IpPrefix pfx(String prefixStr) {
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return new IpPrefix(prefixStr);
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}
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}
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