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Commit a2a9df3e authored by Etan Cohen's avatar Etan Cohen Committed by Gerrit Code Review
Browse files

Merge "Add IPv6 link-local address generation from EUI-48"

parents 22d12411 a8923c5a

core/java/android/net/MacAddress.java

+33 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ package android.net; 


import android.annotation.IntDef;

import android.annotation.NonNull;

import android.annotation.Nullable;

import android.annotation.UnsupportedAppUsage;

import android.os.Parcel;

import android.os.Parcelable;
@@ -27,6 +28,8 @@ import com.android.internal.util.Preconditions; 


import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.net.Inet6Address;

import java.net.UnknownHostException;

import java.security.SecureRandom;

import java.util.Arrays;

import java.util.Random;
@@ -393,4 +396,34 @@ public final class MacAddress implements Parcelable { 
        }

        return out;

    }



    /**

     * Create a link-local Inet6Address from the MAC address. The EUI-48 MAC address is converted

     * to an EUI-64 MAC address per RFC 4291. The resulting EUI-64 is used to construct a link-local

     * IPv6 address per RFC 4862.

     *

     * @return A link-local Inet6Address constructed from the MAC address.

     * @hide

     */

    public @Nullable Inet6Address getLinkLocalIpv6FromEui48Mac() {

        byte[] macEui48Bytes = toByteArray();

        byte[] addr = new byte[16];



        addr[0] = (byte) 0xfe;

        addr[1] = (byte) 0x80;

        addr[8] = (byte) (macEui48Bytes[0] ^ (byte) 0x02); // flip the link-local bit

        addr[9] = macEui48Bytes[1];

        addr[10] = macEui48Bytes[2];

        addr[11] = (byte) 0xff;

        addr[12] = (byte) 0xfe;

        addr[13] = macEui48Bytes[3];

        addr[14] = macEui48Bytes[4];

        addr[15] = macEui48Bytes[5];



        try {

            return Inet6Address.getByAddress(null, addr, 0);

        } catch (UnknownHostException e) {

            return null;

        }

    }

}

tests/net/java/android/net/MacAddressTest.java

+18 −3
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 


package android.net;



import static org.junit.Assert.assertArrayEquals;

import static org.junit.Assert.assertEquals;

import static org.junit.Assert.assertTrue;

import static org.junit.Assert.assertFalse;
@@ -24,12 +25,13 @@ import static org.junit.Assert.fail; 
import android.support.test.filters.SmallTest;

import android.support.test.runner.AndroidJUnit4;



import java.util.Arrays;

import java.util.Random;



import org.junit.Test;

import org.junit.runner.RunWith;



import java.net.Inet6Address;

import java.util.Arrays;

import java.util.Random;



@SmallTest

@RunWith(AndroidJUnit4.class)

public class MacAddressTest {
@@ -252,6 +254,19 @@ public class MacAddressTest { 
        }

    }



    /**

     * Tests that link-local address generation from MAC is valid.

     */

    @Test

    public void testLinkLocalFromMacGeneration() {

        MacAddress mac = MacAddress.fromString("52:74:f2:b1:a8:7f");

        byte[] inet6ll = {(byte) 0xfe, (byte) 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x50, 0x74,

            (byte) 0xf2, (byte) 0xff, (byte) 0xfe, (byte) 0xb1, (byte) 0xa8, 0x7f};

        Inet6Address llv6 = mac.getLinkLocalIpv6FromEui48Mac();

        assertTrue(llv6.isLinkLocalAddress());

        assertArrayEquals(inet6ll, llv6.getAddress());

    }



    static byte[] toByteArray(int... in) {

        byte[] out = new byte[in.length];

        for (int i = 0; i < in.length; i++) {