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/*
* Copyright 2015 Open Networking Laboratory
*
* 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 org.onosproject.pcepio.types;
import java.util.Arrays;
import org.jboss.netty.buffer.ChannelBuffer;
import org.onosproject.pcepio.protocol.PcepVersion;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.MoreObjects;
import com.google.common.base.MoreObjects.ToStringHelper;
/**
* Provides IPv6 Sub Object.
*/
public class IPv6SubObject implements PcepValueType {
/* reference :RFC 4874.
Subobject : IPv6 address
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 | IPv6 address (16 bytes) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv6 address (continued) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv6 address (continued) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv6 address (continued) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv6 address (continued) | Prefix Length | Flags |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type
0x02 IPv6 address
Length
The Length contains the total length of the subobject in bytes,
including the Type and Length fields. The Length is always 20.
IPv6 address
A 128-bit unicast host address.
Prefix length
128
Flags
0x01 Local protection available
Indicates that the link downstream of this node is
protected via a local repair mechanism. This flag can
only be set if the Local protection flag was set in the
SESSION_ATTRIBUTE object of the corresponding Path
message.
0x02 Local protection in use
Indicates that a local repair mechanism is in use to
maintain this tunnel (usually in the face of an outage
of the link it was previously routed over).
*/
protected static final Logger log = LoggerFactory.getLogger(IPv6SubObject.class);
public static final short TYPE = 0x02;
public static final short LENGTH = 20;
public static final byte VALUE_LENGTH = 18;
private static final byte[] NONE_VAL = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
public static final IPv6SubObject NONE = new IPv6SubObject(NONE_VAL);
private static final byte[] NO_MASK_VAL = {(byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF,
(byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF,
(byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF };
public static final IPv6SubObject NO_MASK = new IPv6SubObject(NO_MASK_VAL);
public static final IPv6SubObject FULL_MASK = NONE;
private final byte[] rawValue;
/**
* constructor to initialize rawValue with ipv6 address.
*
* @param rawValue ipv6 address
*/
public IPv6SubObject(byte[] rawValue) {
this.rawValue = rawValue;
}
/**
* To create instance of IPv6SubObject.
*
* @param raw byte array of ipv6 address
* @return object of IPv6SubObject
*/
public static IPv6SubObject of(final byte[] raw) {
//check NONE_VAL
boolean bFoundNONE = true;
//value starts from 3rd byte.
for (int i = 2; i < 20; ++i) {
if (NONE_VAL[i] != raw[i]) {
bFoundNONE = false;
}
}
if (bFoundNONE) {
return NONE;
}
//check NO_MASK_VAL
boolean bFoundNoMask = true;
//value starts from 3rd byte.
for (int i = 2; i < 20; ++i) {
if (0xFF != raw[i]) {
bFoundNoMask = false;
}
}
if (bFoundNoMask) {
return NO_MASK;
}
return new IPv6SubObject(raw);
}
/**
* Returns value of IPv6 Sub Object.
*
* @return byte array of ipv6 address
*/
public byte[] getValue() {
return rawValue;
}
@Override
public PcepVersion getVersion() {
return PcepVersion.PCEP_1;
}
@Override
public short getType() {
return TYPE;
}
@Override
public short getLength() {
return LENGTH;
}
@Override
public int hashCode() {
return Arrays.hashCode(rawValue);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof IPv6SubObject) {
IPv6SubObject other = (IPv6SubObject) obj;
return Arrays.equals(rawValue, other.rawValue);
}
return false;
}
@Override
public int write(ChannelBuffer c) {
int iStartIndex = c.writerIndex();
c.writeShort(TYPE);
c.writeShort(LENGTH);
c.writeBytes(rawValue);
return c.writerIndex() - iStartIndex;
}
/**
* Reads the channel buffer and returns object of IPv6SubObject.
*
* @param c type of channel buffer
* @return object of IPv6SubObject
*/
public static IPv6SubObject read20Bytes(ChannelBuffer c) {
byte[] yTemp = new byte[20];
c.readBytes(yTemp, 0, 20);
return IPv6SubObject.of(yTemp);
}
@Override
public String toString() {
ToStringHelper toStrHelper = MoreObjects.toStringHelper(getClass());
toStrHelper.add("Type", TYPE);
toStrHelper.add("Length", LENGTH);
StringBuffer result = new StringBuffer();
for (byte b : rawValue) {
result.append(String.format("%02X ", b));
}
toStrHelper.add("Value", result);
return toStrHelper.toString();
}
}
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