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Add IPv6 link-local address generation from EUI-48

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Add a utility method to convert an EUI-48 to an IPv6 link-local
address based on RFC 4291 (EUI-64 generation) followed by RFC 4862.

Bug: 117605977
Test: atest MacAddressTest
Merged-In: I80b683e69da6beff3b37fc345fc15aa9610d09b7
Change-Id: I80b683e69da6beff3b37fc345fc15aa9610d09b7
This commit is contained in:
Etan Cohen
2018-11-02 15:07:20 -07:00
parent 932f96b27f
commit a8923c5aea
2 changed files with 51 additions and 3 deletions
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33
core/java/android/net/MacAddress.java
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@@ -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;
}
}
}