| /* |
| * 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); |
| } |
| } |