PrefixUtils.java revision 32179ff81511e00aef31e8fda705be3df074ece6
132179ff81511e00aef31e8fda705be3df074ece6Erik Kline/* 232179ff81511e00aef31e8fda705be3df074ece6Erik Kline * Copyright (C) 2017 The Android Open Source Project 332179ff81511e00aef31e8fda705be3df074ece6Erik Kline * 432179ff81511e00aef31e8fda705be3df074ece6Erik Kline * Licensed under the Apache License, Version 2.0 (the "License"); 532179ff81511e00aef31e8fda705be3df074ece6Erik Kline * you may not use this file except in compliance with the License. 632179ff81511e00aef31e8fda705be3df074ece6Erik Kline * You may obtain a copy of the License at 732179ff81511e00aef31e8fda705be3df074ece6Erik Kline * 832179ff81511e00aef31e8fda705be3df074ece6Erik Kline * http://www.apache.org/licenses/LICENSE-2.0 932179ff81511e00aef31e8fda705be3df074ece6Erik Kline * 1032179ff81511e00aef31e8fda705be3df074ece6Erik Kline * Unless required by applicable law or agreed to in writing, software 1132179ff81511e00aef31e8fda705be3df074ece6Erik Kline * distributed under the License is distributed on an "AS IS" BASIS, 1232179ff81511e00aef31e8fda705be3df074ece6Erik Kline * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1332179ff81511e00aef31e8fda705be3df074ece6Erik Kline * See the License for the specific language governing permissions and 1432179ff81511e00aef31e8fda705be3df074ece6Erik Kline * limitations under the License. 1532179ff81511e00aef31e8fda705be3df074ece6Erik Kline */ 1632179ff81511e00aef31e8fda705be3df074ece6Erik Kline 1732179ff81511e00aef31e8fda705be3df074ece6Erik Klinepackage android.net.util; 1832179ff81511e00aef31e8fda705be3df074ece6Erik Kline 1932179ff81511e00aef31e8fda705be3df074ece6Erik Klineimport android.net.IpPrefix; 2032179ff81511e00aef31e8fda705be3df074ece6Erik Klineimport android.net.LinkAddress; 2132179ff81511e00aef31e8fda705be3df074ece6Erik Klineimport android.net.LinkProperties; 2232179ff81511e00aef31e8fda705be3df074ece6Erik Kline 2332179ff81511e00aef31e8fda705be3df074ece6Erik Klineimport java.util.Collections; 2432179ff81511e00aef31e8fda705be3df074ece6Erik Klineimport java.util.HashSet; 2532179ff81511e00aef31e8fda705be3df074ece6Erik Klineimport java.util.Set; 2632179ff81511e00aef31e8fda705be3df074ece6Erik Kline 2732179ff81511e00aef31e8fda705be3df074ece6Erik Kline 2832179ff81511e00aef31e8fda705be3df074ece6Erik Kline/** 2932179ff81511e00aef31e8fda705be3df074ece6Erik Kline * @hide 3032179ff81511e00aef31e8fda705be3df074ece6Erik Kline */ 3132179ff81511e00aef31e8fda705be3df074ece6Erik Klinepublic class PrefixUtils { 3232179ff81511e00aef31e8fda705be3df074ece6Erik Kline private static final IpPrefix[] MIN_NON_FORWARDABLE_PREFIXES = { 3332179ff81511e00aef31e8fda705be3df074ece6Erik Kline pfx("127.0.0.0/8"), // IPv4 loopback 3432179ff81511e00aef31e8fda705be3df074ece6Erik Kline pfx("169.254.0.0/16"), // IPv4 link-local, RFC3927#section-8 3532179ff81511e00aef31e8fda705be3df074ece6Erik Kline pfx("::/3"), 3632179ff81511e00aef31e8fda705be3df074ece6Erik Kline pfx("fe80::/64"), // IPv6 link-local 3732179ff81511e00aef31e8fda705be3df074ece6Erik Kline pfx("fc00::/7"), // IPv6 ULA 3832179ff81511e00aef31e8fda705be3df074ece6Erik Kline pfx("ff02::/8"), // IPv6 link-local multicast 3932179ff81511e00aef31e8fda705be3df074ece6Erik Kline }; 4032179ff81511e00aef31e8fda705be3df074ece6Erik Kline 4132179ff81511e00aef31e8fda705be3df074ece6Erik Kline public static final IpPrefix DEFAULT_WIFI_P2P_PREFIX = pfx("192.168.49.0/24"); 4232179ff81511e00aef31e8fda705be3df074ece6Erik Kline 4332179ff81511e00aef31e8fda705be3df074ece6Erik Kline public static Set<IpPrefix> getNonForwardablePrefixes() { 4432179ff81511e00aef31e8fda705be3df074ece6Erik Kline final HashSet<IpPrefix> prefixes = new HashSet<>(); 4532179ff81511e00aef31e8fda705be3df074ece6Erik Kline addNonForwardablePrefixes(prefixes); 4632179ff81511e00aef31e8fda705be3df074ece6Erik Kline return prefixes; 4732179ff81511e00aef31e8fda705be3df074ece6Erik Kline } 4832179ff81511e00aef31e8fda705be3df074ece6Erik Kline 4932179ff81511e00aef31e8fda705be3df074ece6Erik Kline public static void addNonForwardablePrefixes(Set<IpPrefix> prefixes) { 5032179ff81511e00aef31e8fda705be3df074ece6Erik Kline Collections.addAll(prefixes, MIN_NON_FORWARDABLE_PREFIXES); 5132179ff81511e00aef31e8fda705be3df074ece6Erik Kline } 5232179ff81511e00aef31e8fda705be3df074ece6Erik Kline 5332179ff81511e00aef31e8fda705be3df074ece6Erik Kline public static Set<IpPrefix> localPrefixesFrom(LinkProperties lp) { 5432179ff81511e00aef31e8fda705be3df074ece6Erik Kline final HashSet<IpPrefix> localPrefixes = new HashSet<>(); 5532179ff81511e00aef31e8fda705be3df074ece6Erik Kline if (lp == null) return localPrefixes; 5632179ff81511e00aef31e8fda705be3df074ece6Erik Kline 5732179ff81511e00aef31e8fda705be3df074ece6Erik Kline for (LinkAddress addr : lp.getAllLinkAddresses()) { 5832179ff81511e00aef31e8fda705be3df074ece6Erik Kline if (addr.getAddress().isLinkLocalAddress()) continue; 5932179ff81511e00aef31e8fda705be3df074ece6Erik Kline localPrefixes.add(asIpPrefix(addr)); 6032179ff81511e00aef31e8fda705be3df074ece6Erik Kline } 6132179ff81511e00aef31e8fda705be3df074ece6Erik Kline // TODO: Add directly-connected routes as well (ones from which we did 6232179ff81511e00aef31e8fda705be3df074ece6Erik Kline // not also form a LinkAddress)? 6332179ff81511e00aef31e8fda705be3df074ece6Erik Kline 6432179ff81511e00aef31e8fda705be3df074ece6Erik Kline return localPrefixes; 6532179ff81511e00aef31e8fda705be3df074ece6Erik Kline } 6632179ff81511e00aef31e8fda705be3df074ece6Erik Kline 6732179ff81511e00aef31e8fda705be3df074ece6Erik Kline public static IpPrefix asIpPrefix(LinkAddress addr) { 6832179ff81511e00aef31e8fda705be3df074ece6Erik Kline return new IpPrefix(addr.getAddress(), addr.getPrefixLength()); 6932179ff81511e00aef31e8fda705be3df074ece6Erik Kline } 7032179ff81511e00aef31e8fda705be3df074ece6Erik Kline 7132179ff81511e00aef31e8fda705be3df074ece6Erik Kline private static IpPrefix pfx(String prefixStr) { 7232179ff81511e00aef31e8fda705be3df074ece6Erik Kline return new IpPrefix(prefixStr); 7332179ff81511e00aef31e8fda705be3df074ece6Erik Kline } 7432179ff81511e00aef31e8fda705be3df074ece6Erik Kline} 75