700778be70
MdnsSocketProvider currently does not fill addresses of downstream tethering interfaces in its callbacks. The interface addresses should be properly updated by listening to the Netlink messages. Test: atest FrameworksNetTests CtsNetTestCases Bug: 267980538 Change-Id: I753e547a1b092703fe59c6c9e922ee8aca245f67
555 lines
21 KiB
Java
555 lines
21 KiB
Java
/*
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* Copyright (C) 2010 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;
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import static android.system.OsConstants.IFA_F_DADFAILED;
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import static android.system.OsConstants.IFA_F_DEPRECATED;
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import static android.system.OsConstants.IFA_F_OPTIMISTIC;
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import static android.system.OsConstants.IFA_F_PERMANENT;
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import static android.system.OsConstants.IFA_F_TENTATIVE;
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import static android.system.OsConstants.RT_SCOPE_HOST;
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import static android.system.OsConstants.RT_SCOPE_LINK;
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import static android.system.OsConstants.RT_SCOPE_SITE;
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import static android.system.OsConstants.RT_SCOPE_UNIVERSE;
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import android.annotation.IntRange;
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import android.annotation.NonNull;
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import android.annotation.Nullable;
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import android.annotation.SystemApi;
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import android.compat.annotation.UnsupportedAppUsage;
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import android.os.Build;
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import android.os.Parcel;
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import android.os.Parcelable;
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import android.os.SystemClock;
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import android.util.Pair;
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import java.net.Inet4Address;
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import java.net.Inet6Address;
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import java.net.InetAddress;
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import java.net.InterfaceAddress;
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import java.net.UnknownHostException;
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import java.util.Objects;
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/**
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* Identifies an IP address on a network link.
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*
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* A {@code LinkAddress} consists of:
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* <ul>
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* <li>An IP address and prefix length (e.g., {@code 2001:db8::1/64} or {@code 192.0.2.1/24}).
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* The address must be unicast, as multicast addresses cannot be assigned to interfaces.
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* <li>Address flags: A bitmask of {@code OsConstants.IFA_F_*} values representing properties
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* of the address (e.g., {@code android.system.OsConstants.IFA_F_OPTIMISTIC}).
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* <li>Address scope: One of the {@code OsConstants.IFA_F_*} values; defines the scope in which
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* the address is unique (e.g.,
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* {@code android.system.OsConstants.RT_SCOPE_LINK} or
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* {@code android.system.OsConstants.RT_SCOPE_UNIVERSE}).
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* </ul>
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*/
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public class LinkAddress implements Parcelable {
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/**
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* Indicates the deprecation or expiration time is unknown
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* @hide
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*/
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@SystemApi
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public static final long LIFETIME_UNKNOWN = -1;
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/**
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* Indicates this address is permanent.
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* @hide
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*/
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@SystemApi
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public static final long LIFETIME_PERMANENT = Long.MAX_VALUE;
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/**
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* IPv4 or IPv6 address.
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*/
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@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
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private InetAddress address;
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/**
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* Prefix length.
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*/
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@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
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private int prefixLength;
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/**
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* Address flags. A bitmask of {@code IFA_F_*} values. Note that {@link #getFlags()} may not
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* return these exact values. For example, it may set or clear the {@code IFA_F_DEPRECATED}
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* flag depending on the current preferred lifetime.
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*/
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private int flags;
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/**
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* Address scope. One of the RT_SCOPE_* constants.
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*/
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private int scope;
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/**
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* The time, as reported by {@link SystemClock#elapsedRealtime}, when this LinkAddress will be
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* or was deprecated. At the time existing connections can still use this address until it
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* expires, but new connections should use the new address. {@link #LIFETIME_UNKNOWN} indicates
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* this information is not available. {@link #LIFETIME_PERMANENT} indicates this
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* {@link LinkAddress} will never be deprecated.
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*/
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private long deprecationTime;
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/**
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* The time, as reported by {@link SystemClock#elapsedRealtime}, when this {@link LinkAddress}
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* will expire and be removed from the interface. {@link #LIFETIME_UNKNOWN} indicates this
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* information is not available. {@link #LIFETIME_PERMANENT} indicates this {@link LinkAddress}
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* will never expire.
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*/
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private long expirationTime;
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/**
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* Utility function to determines the scope of a unicast address. Per RFC 4291 section 2.5 and
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* RFC 6724 section 3.2.
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* @hide
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*/
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private static int scopeForUnicastAddress(InetAddress addr) {
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if (addr.isAnyLocalAddress()) {
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return RT_SCOPE_HOST;
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}
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if (addr.isLoopbackAddress() || addr.isLinkLocalAddress()) {
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return RT_SCOPE_LINK;
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}
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// isSiteLocalAddress() returns true for private IPv4 addresses, but RFC 6724 section 3.2
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// says that they are assigned global scope.
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if (!(addr instanceof Inet4Address) && addr.isSiteLocalAddress()) {
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return RT_SCOPE_SITE;
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}
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return RT_SCOPE_UNIVERSE;
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}
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/**
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* Utility function to check if |address| is a Unique Local IPv6 Unicast Address
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* (a.k.a. "ULA"; RFC 4193).
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*
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* Per RFC 4193 section 8, fc00::/7 identifies these addresses.
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*/
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private boolean isIpv6ULA() {
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if (isIpv6()) {
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byte[] bytes = address.getAddress();
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return ((bytes[0] & (byte)0xfe) == (byte)0xfc);
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}
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return false;
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}
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/**
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* @return true if the address is IPv6.
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* @hide
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*/
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@SystemApi
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public boolean isIpv6() {
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return address instanceof Inet6Address;
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}
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/**
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* For backward compatibility.
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* This was annotated with @UnsupportedAppUsage in P, so we can't remove the method completely
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* just yet.
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* @return true if the address is IPv6.
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* @hide
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*/
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@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
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public boolean isIPv6() {
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return isIpv6();
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}
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/**
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* @return true if the address is IPv4 or is a mapped IPv4 address.
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* @hide
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*/
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@SystemApi
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public boolean isIpv4() {
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return address instanceof Inet4Address;
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}
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/**
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* Utility function for the constructors.
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*/
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private void init(InetAddress address, int prefixLength, int flags, int scope,
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long deprecationTime, long expirationTime) {
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if (address == null ||
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address.isMulticastAddress() ||
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prefixLength < 0 ||
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(address instanceof Inet4Address && prefixLength > 32) ||
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(prefixLength > 128)) {
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throw new IllegalArgumentException("Bad LinkAddress params " + address +
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"/" + prefixLength);
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}
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// deprecation time and expiration time must be both provided, or neither.
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if ((deprecationTime == LIFETIME_UNKNOWN) != (expirationTime == LIFETIME_UNKNOWN)) {
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throw new IllegalArgumentException(
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"Must not specify only one of deprecation time and expiration time");
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}
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// deprecation time needs to be a positive value.
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if (deprecationTime != LIFETIME_UNKNOWN && deprecationTime < 0) {
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throw new IllegalArgumentException("invalid deprecation time " + deprecationTime);
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}
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// expiration time needs to be a positive value.
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if (expirationTime != LIFETIME_UNKNOWN && expirationTime < 0) {
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throw new IllegalArgumentException("invalid expiration time " + expirationTime);
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}
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// expiration time can't be earlier than deprecation time
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if (deprecationTime != LIFETIME_UNKNOWN && expirationTime != LIFETIME_UNKNOWN
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&& expirationTime < deprecationTime) {
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throw new IllegalArgumentException("expiration earlier than deprecation ("
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+ deprecationTime + ", " + expirationTime + ")");
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}
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this.address = address;
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this.prefixLength = prefixLength;
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this.flags = flags;
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this.scope = scope;
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this.deprecationTime = deprecationTime;
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this.expirationTime = expirationTime;
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}
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/**
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* Constructs a new {@code LinkAddress} from an {@code InetAddress} and prefix length, with
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* the specified flags and scope. Flags and scope are not checked for validity.
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*
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* @param address The IP address.
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* @param prefixLength The prefix length. Must be >= 0 and <= (32 or 128) (IPv4 or IPv6).
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* @param flags A bitmask of {@code IFA_F_*} values representing properties of the address.
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* @param scope An integer defining the scope in which the address is unique (e.g.,
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* {@link OsConstants#RT_SCOPE_LINK} or {@link OsConstants#RT_SCOPE_SITE}).
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* @hide
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*/
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@SystemApi
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public LinkAddress(@NonNull InetAddress address, @IntRange(from = 0, to = 128) int prefixLength,
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int flags, int scope) {
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init(address, prefixLength, flags, scope, LIFETIME_UNKNOWN, LIFETIME_UNKNOWN);
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}
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/**
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* Constructs a new {@code LinkAddress} from an {@code InetAddress}, prefix length, with
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* the specified flags, scope, deprecation time, and expiration time. Flags and scope are not
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* checked for validity. The value of the {@code IFA_F_DEPRECATED} and {@code IFA_F_PERMANENT}
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* flag will be adjusted based on the passed-in lifetimes.
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*
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* @param address The IP address.
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* @param prefixLength The prefix length. Must be >= 0 and <= (32 or 128) (IPv4 or IPv6).
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* @param flags A bitmask of {@code IFA_F_*} values representing properties of the address.
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* @param scope An integer defining the scope in which the address is unique (e.g.,
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* {@link OsConstants#RT_SCOPE_LINK} or {@link OsConstants#RT_SCOPE_SITE}).
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* @param deprecationTime The time, as reported by {@link SystemClock#elapsedRealtime}, when
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* this {@link LinkAddress} will be or was deprecated. At the time
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* existing connections can still use this address until it expires, but
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* new connections should use the new address. {@link #LIFETIME_UNKNOWN}
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* indicates this information is not available.
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* {@link #LIFETIME_PERMANENT} indicates this {@link LinkAddress} will
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* never be deprecated.
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* @param expirationTime The time, as reported by {@link SystemClock#elapsedRealtime}, when this
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* {@link LinkAddress} will expire and be removed from the interface.
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* {@link #LIFETIME_UNKNOWN} indicates this information is not available.
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* {@link #LIFETIME_PERMANENT} indicates this {@link LinkAddress} will
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* never expire.
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* @hide
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*/
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@SystemApi
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public LinkAddress(@NonNull InetAddress address, @IntRange(from = 0, to = 128) int prefixLength,
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int flags, int scope, long deprecationTime, long expirationTime) {
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init(address, prefixLength, flags, scope, deprecationTime, expirationTime);
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}
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/**
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* Constructs a new {@code LinkAddress} from an {@code InetAddress} and a prefix length.
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* The flags are set to zero and the scope is determined from the address.
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* @param address The IP address.
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* @param prefixLength The prefix length. Must be >= 0 and <= (32 or 128) (IPv4 or IPv6).
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* @hide
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*/
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@SystemApi
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public LinkAddress(@NonNull InetAddress address,
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@IntRange(from = 0, to = 128) int prefixLength) {
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this(address, prefixLength, 0, 0);
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this.scope = scopeForUnicastAddress(address);
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}
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/**
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* Constructs a new {@code LinkAddress} from an {@code InterfaceAddress}.
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* The flags are set to zero and the scope is determined from the address.
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* @param interfaceAddress The interface address.
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* @hide
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*/
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public LinkAddress(@NonNull InterfaceAddress interfaceAddress) {
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this(interfaceAddress.getAddress(),
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interfaceAddress.getNetworkPrefixLength());
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}
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/**
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* Constructs a new {@code LinkAddress} from a string such as "192.0.2.5/24" or
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* "2001:db8::1/64". The flags are set to zero and the scope is determined from the address.
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* @param address The string to parse.
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* @hide
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*/
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@SystemApi
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public LinkAddress(@NonNull String address) {
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this(address, 0, 0);
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this.scope = scopeForUnicastAddress(this.address);
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}
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/**
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* Constructs a new {@code LinkAddress} from a string such as "192.0.2.5/24" or
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* "2001:db8::1/64", with the specified flags and scope.
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* @param address The string to parse.
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* @param flags The address flags.
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* @param scope The address scope.
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* @hide
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*/
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@SystemApi
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public LinkAddress(@NonNull String address, int flags, int scope) {
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// This may throw an IllegalArgumentException; catching it is the caller's responsibility.
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// TODO: consider rejecting mapped IPv4 addresses such as "::ffff:192.0.2.5/24".
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Pair<InetAddress, Integer> ipAndMask = NetworkUtils.legacyParseIpAndMask(address);
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init(ipAndMask.first, ipAndMask.second, flags, scope, LIFETIME_UNKNOWN, LIFETIME_UNKNOWN);
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}
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/**
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* Returns a string representation of this address, such as "192.0.2.1/24" or "2001:db8::1/64".
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* The string representation does not contain the flags and scope, just the address and prefix
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* length.
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*/
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@Override
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public String toString() {
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return address.getHostAddress() + "/" + prefixLength;
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}
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/**
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* Compares this {@code LinkAddress} instance against {@code obj}. Two addresses are equal if
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* their address, prefix length, flags and scope are equal. Thus, for example, two addresses
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* that have the same address and prefix length are not equal if one of them is deprecated and
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* the other is not.
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*
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* @param obj the object to be tested for equality.
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* @return {@code true} if both objects are equal, {@code false} otherwise.
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*/
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@Override
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public boolean equals(@Nullable Object obj) {
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if (!(obj instanceof LinkAddress)) {
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return false;
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}
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LinkAddress linkAddress = (LinkAddress) obj;
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return this.address.equals(linkAddress.address)
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&& this.prefixLength == linkAddress.prefixLength
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&& this.flags == linkAddress.flags
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&& this.scope == linkAddress.scope
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&& this.deprecationTime == linkAddress.deprecationTime
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&& this.expirationTime == linkAddress.expirationTime;
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}
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/**
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* Returns a hashcode for this address.
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*/
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@Override
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public int hashCode() {
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return Objects.hash(address, prefixLength, flags, scope, deprecationTime, expirationTime);
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}
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/**
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* Determines whether this {@code LinkAddress} and the provided {@code LinkAddress}
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* represent the same address. Two {@code LinkAddresses} represent the same address
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* if they have the same IP address and prefix length, even if their properties are
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* different.
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*
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* @param other the {@code LinkAddress} to compare to.
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* @return {@code true} if both objects have the same address and prefix length, {@code false}
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* otherwise.
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* @hide
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*/
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@SystemApi
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public boolean isSameAddressAs(@Nullable LinkAddress other) {
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if (other == null) {
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return false;
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}
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return address.equals(other.address) && prefixLength == other.prefixLength;
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}
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/**
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* Returns the {@link InetAddress} of this {@code LinkAddress}.
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*/
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public InetAddress getAddress() {
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return address;
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}
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/**
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* Returns the prefix length of this {@code LinkAddress}.
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*/
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@IntRange(from = 0, to = 128)
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public int getPrefixLength() {
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return prefixLength;
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}
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/**
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* Returns the prefix length of this {@code LinkAddress}.
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* TODO: Delete all callers and remove in favour of getPrefixLength().
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* @hide
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*/
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@UnsupportedAppUsage
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@IntRange(from = 0, to = 128)
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public int getNetworkPrefixLength() {
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return getPrefixLength();
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}
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/**
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* Returns the flags of this {@code LinkAddress}.
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*/
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public int getFlags() {
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int flags = this.flags;
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if (deprecationTime != LIFETIME_UNKNOWN) {
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if (SystemClock.elapsedRealtime() >= deprecationTime) {
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flags |= IFA_F_DEPRECATED;
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} else {
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// If deprecation time is in the future, or permanent.
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flags &= ~IFA_F_DEPRECATED;
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}
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}
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if (expirationTime == LIFETIME_PERMANENT) {
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flags |= IFA_F_PERMANENT;
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} else if (expirationTime != LIFETIME_UNKNOWN) {
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// If we know this address expired or will expire in the future, then this address
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// should not be permanent.
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flags &= ~IFA_F_PERMANENT;
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}
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// Do no touch the original flags. Return the adjusted flags here.
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return flags;
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}
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/**
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* Returns the scope of this {@code LinkAddress}.
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*/
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public int getScope() {
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return scope;
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}
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/**
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* Get the deprecation time, as reported by {@link SystemClock#elapsedRealtime}, when this
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* {@link LinkAddress} will be or was deprecated. At the time existing connections can still use
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* this address until it expires, but new connections should use the new address.
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*
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* @return The deprecation time in milliseconds. {@link #LIFETIME_UNKNOWN} indicates this
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* information is not available. {@link #LIFETIME_PERMANENT} indicates this {@link LinkAddress}
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* will never be deprecated.
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*
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* @hide
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*/
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@SystemApi
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public long getDeprecationTime() {
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return deprecationTime;
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}
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/**
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* Get the expiration time, as reported by {@link SystemClock#elapsedRealtime}, when this
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* {@link LinkAddress} will expire and be removed from the interface.
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*
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* @return The expiration time in milliseconds. {@link #LIFETIME_UNKNOWN} indicates this
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* information is not available. {@link #LIFETIME_PERMANENT} indicates this {@link LinkAddress}
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* will never expire.
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*
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* @hide
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*/
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@SystemApi
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public long getExpirationTime() {
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return expirationTime;
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}
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/**
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* Returns true if this {@code LinkAddress} is global scope and preferred (i.e., not currently
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* deprecated).
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*
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* @hide
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*/
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@SystemApi
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public boolean isGlobalPreferred() {
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return (scope == RT_SCOPE_UNIVERSE
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&& !isIpv6ULA()
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&& isPreferred());
|
|
}
|
|
|
|
/**
|
|
* Checks if the address is a preferred address.
|
|
*
|
|
* @hide
|
|
*/
|
|
public boolean isPreferred() {
|
|
// Note that addresses flagged as IFA_F_OPTIMISTIC are simultaneously flagged as
|
|
// IFA_F_TENTATIVE (when the tentative state has cleared either DAD has succeeded or
|
|
// failed, and both flags are cleared regardless).
|
|
int flags = getFlags();
|
|
return (flags & (IFA_F_DADFAILED | IFA_F_DEPRECATED)) == 0L
|
|
&& ((flags & IFA_F_TENTATIVE) == 0L || (flags & IFA_F_OPTIMISTIC) != 0L);
|
|
}
|
|
|
|
/**
|
|
* Implement the Parcelable interface.
|
|
*/
|
|
public int describeContents() {
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Implement the Parcelable interface.
|
|
*/
|
|
public void writeToParcel(Parcel dest, int flags) {
|
|
dest.writeByteArray(address.getAddress());
|
|
dest.writeInt(prefixLength);
|
|
dest.writeInt(this.flags);
|
|
dest.writeInt(scope);
|
|
dest.writeLong(deprecationTime);
|
|
dest.writeLong(expirationTime);
|
|
}
|
|
|
|
/**
|
|
* Implement the Parcelable interface.
|
|
*/
|
|
public static final @android.annotation.NonNull Creator<LinkAddress> CREATOR =
|
|
new Creator<LinkAddress>() {
|
|
public LinkAddress createFromParcel(Parcel in) {
|
|
InetAddress address = null;
|
|
try {
|
|
address = InetAddress.getByAddress(in.createByteArray());
|
|
} catch (UnknownHostException e) {
|
|
// Nothing we can do here. When we call the constructor, we'll throw an
|
|
// IllegalArgumentException, because a LinkAddress can't have a null
|
|
// InetAddress.
|
|
}
|
|
int prefixLength = in.readInt();
|
|
int flags = in.readInt();
|
|
int scope = in.readInt();
|
|
long deprecationTime = in.readLong();
|
|
long expirationTime = in.readLong();
|
|
return new LinkAddress(address, prefixLength, flags, scope, deprecationTime,
|
|
expirationTime);
|
|
}
|
|
|
|
public LinkAddress[] newArray(int size) {
|
|
return new LinkAddress[size];
|
|
}
|
|
};
|
|
}
|