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/*
* 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);
}
}
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