diff options
Diffstat (limited to 'common/device/com/android/net/module/util/netlink/StructNdOptPref64.java')
| -rw-r--r-- | common/device/com/android/net/module/util/netlink/StructNdOptPref64.java | 171 |
1 files changed, 0 insertions, 171 deletions
diff --git a/common/device/com/android/net/module/util/netlink/StructNdOptPref64.java b/common/device/com/android/net/module/util/netlink/StructNdOptPref64.java deleted file mode 100644 index 82263466..00000000 --- a/common/device/com/android/net/module/util/netlink/StructNdOptPref64.java +++ /dev/null @@ -1,171 +0,0 @@ -/* - * Copyright (C) 2020 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 com.android.net.module.util.netlink; - -import android.annotation.SuppressLint; -import android.net.IpPrefix; -import android.util.Log; - -import androidx.annotation.NonNull; - -import java.net.Inet6Address; -import java.net.InetAddress; -import java.net.UnknownHostException; -import java.nio.ByteBuffer; -import java.util.Objects; - -/** - * The PREF64 router advertisement option. RFC 8781. - * - * 0 1 2 3 - * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | Type | Length | Scaled Lifetime | PLC | - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | | - * + + - * | Highest 96 bits of the Prefix | - * + + - * | | - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * - */ -public class StructNdOptPref64 extends NdOption { - public static final int STRUCT_SIZE = 16; - public static final int TYPE = 38; - public static final byte LENGTH = 2; - - private static final String TAG = StructNdOptPref64.class.getSimpleName(); - - /** - * How many seconds the prefix is expected to remain valid. - * Valid values are from 0 to 65528 in multiples of 8. - */ - public final int lifetime; - /** The NAT64 prefix. */ - @NonNull public final IpPrefix prefix; - - static int plcToPrefixLength(int plc) { - switch (plc) { - case 0: return 96; - case 1: return 64; - case 2: return 56; - case 3: return 48; - case 4: return 40; - case 5: return 32; - default: - throw new IllegalArgumentException("Invalid prefix length code " + plc); - } - } - - static int prefixLengthToPlc(int prefixLength) { - switch (prefixLength) { - case 96: return 0; - case 64: return 1; - case 56: return 2; - case 48: return 3; - case 40: return 4; - case 32: return 5; - default: - throw new IllegalArgumentException("Invalid prefix length " + prefixLength); - } - } - - /** - * Returns the 2-byte "scaled lifetime and prefix length code" field: 13-bit lifetime, 3-bit PLC - */ - static short getScaledLifetimePlc(int lifetime, int prefixLengthCode) { - return (short) ((lifetime & 0xfff8) | (prefixLengthCode & 0x7)); - } - - public StructNdOptPref64(@NonNull IpPrefix prefix, int lifetime) { - super((byte) TYPE, LENGTH); - - Objects.requireNonNull(prefix, "prefix must not be null"); - if (!(prefix.getAddress() instanceof Inet6Address)) { - throw new IllegalArgumentException("Must be an IPv6 prefix: " + prefix); - } - prefixLengthToPlc(prefix.getPrefixLength()); // Throw if the prefix length is invalid. - this.prefix = prefix; - - if (lifetime < 0 || lifetime > 0xfff8) { - throw new IllegalArgumentException("Invalid lifetime " + lifetime); - } - this.lifetime = lifetime & 0xfff8; - } - - @SuppressLint("NewApi") - private StructNdOptPref64(@NonNull ByteBuffer buf) { - super(buf.get(), Byte.toUnsignedInt(buf.get())); - if (type != TYPE) throw new IllegalArgumentException("Invalid type " + type); - if (length != LENGTH) throw new IllegalArgumentException("Invalid length " + length); - - int scaledLifetimePlc = Short.toUnsignedInt(buf.getShort()); - lifetime = scaledLifetimePlc & 0xfff8; - - byte[] addressBytes = new byte[16]; - buf.get(addressBytes, 0, 12); - InetAddress addr; - try { - addr = InetAddress.getByAddress(addressBytes); - } catch (UnknownHostException e) { - throw new AssertionError("16-byte array not valid InetAddress?"); - } - prefix = new IpPrefix(addr, plcToPrefixLength(scaledLifetimePlc & 7)); - } - - /** - * Parses an option from a {@link ByteBuffer}. - * - * @param buf The buffer from which to parse the option. The buffer's byte order must be - * {@link java.nio.ByteOrder#BIG_ENDIAN}. - * @return the parsed option, or {@code null} if the option could not be parsed successfully - * (for example, if it was truncated, or if the prefix length code was wrong). - */ - public static StructNdOptPref64 parse(@NonNull ByteBuffer buf) { - if (buf.remaining() < STRUCT_SIZE) return null; - try { - return new StructNdOptPref64(buf); - } catch (IllegalArgumentException e) { - // Not great, but better than throwing an exception that might crash the caller. - // Convention in this package is that null indicates that the option was truncated, so - // callers must already handle it. - Log.d(TAG, "Invalid PREF64 option: " + e); - return null; - } - } - - protected void writeToByteBuffer(ByteBuffer buf) { - super.writeToByteBuffer(buf); - buf.putShort(getScaledLifetimePlc(lifetime, prefixLengthToPlc(prefix.getPrefixLength()))); - buf.put(prefix.getRawAddress(), 0, 12); - } - - /** Outputs the wire format of the option to a new big-endian ByteBuffer. */ - public ByteBuffer toByteBuffer() { - ByteBuffer buf = ByteBuffer.allocate(STRUCT_SIZE); - writeToByteBuffer(buf); - buf.flip(); - return buf; - } - - @Override - @NonNull - public String toString() { - return String.format("NdOptPref64(%s, %d)", prefix, lifetime); - } -} |