| /* |
| * Copyright 2015-present 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.bgpio.types; |
| |
| import java.net.InetAddress; |
| import java.util.Objects; |
| |
| import org.jboss.netty.buffer.ChannelBuffer; |
| import org.onlab.packet.Ip4Address; |
| import org.onosproject.bgpio.exceptions.BgpParseException; |
| import org.onosproject.bgpio.util.Constants; |
| import org.onosproject.bgpio.util.Validation; |
| |
| import com.google.common.base.MoreObjects; |
| import com.google.common.base.Preconditions; |
| |
| /** |
| * Implementation of NextHop BGP Path Attribute. |
| */ |
| public class NextHop implements BgpValueType { |
| public static final byte NEXTHOP_TYPE = 3; |
| public static final byte FLAGS = (byte) 0x40; |
| private boolean isNextHop = false; |
| private Ip4Address nextHop; |
| |
| /** |
| * Constructor to initialize parameters. |
| * |
| * @param nextHop nextHop address |
| */ |
| public NextHop(Ip4Address nextHop) { |
| this.nextHop = Preconditions.checkNotNull(nextHop); |
| this.isNextHop = true; |
| } |
| |
| /** |
| * Constructor to initialize default parameters. |
| * |
| */ |
| public NextHop() { |
| this.nextHop = null; |
| } |
| |
| /** |
| * Returns whether next hop is present. |
| * |
| * @return whether next hop is present |
| */ |
| public boolean isNextHopSet() { |
| return this.isNextHop; |
| } |
| |
| /** |
| * Reads from ChannelBuffer and parses NextHop. |
| * |
| * @param cb ChannelBuffer |
| * @return object of NextHop |
| * @throws BgpParseException while parsing nexthop attribute |
| */ |
| public static NextHop read(ChannelBuffer cb) throws BgpParseException { |
| Ip4Address nextHop; |
| ChannelBuffer tempCb = cb.copy(); |
| Validation parseFlags = Validation.parseAttributeHeader(cb); |
| |
| if (cb.readableBytes() < parseFlags.getLength()) { |
| Validation.validateLen(BgpErrorType.UPDATE_MESSAGE_ERROR, BgpErrorType.ATTRIBUTE_LENGTH_ERROR, |
| parseFlags.getLength()); |
| } |
| int len = parseFlags.isShort() ? parseFlags.getLength() + Constants.TYPE_AND_LEN_AS_SHORT : parseFlags |
| .getLength() + Constants.TYPE_AND_LEN_AS_BYTE; |
| ChannelBuffer data = tempCb.readBytes(len); |
| if (parseFlags.getFirstBit() && !parseFlags.getSecondBit() && parseFlags.getThirdBit()) { |
| throw new BgpParseException(BgpErrorType.UPDATE_MESSAGE_ERROR, BgpErrorType.ATTRIBUTE_FLAGS_ERROR, data); |
| } |
| |
| InetAddress ipAddress = Validation.toInetAddress(parseFlags.getLength(), cb); |
| if (ipAddress.isMulticastAddress()) { |
| throw new BgpParseException("Multicast address is not supported"); |
| } |
| |
| nextHop = Ip4Address.valueOf(ipAddress); |
| return new NextHop(nextHop); |
| } |
| |
| /** |
| * Return nexthop address. |
| * |
| * @return nexthop address |
| */ |
| public Ip4Address nextHop() { |
| return nextHop; |
| } |
| |
| @Override |
| public short getType() { |
| return NEXTHOP_TYPE; |
| } |
| |
| @Override |
| public int write(ChannelBuffer cb) { |
| int iLenStartIndex = cb.writerIndex(); |
| cb.writeByte(FLAGS); |
| cb.writeByte(getType()); |
| if (!isNextHopSet()) { |
| cb.writeByte(0); |
| } else { |
| cb.writeInt(nextHop.toInt()); |
| } |
| |
| return cb.writerIndex() - iLenStartIndex; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(nextHop); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj instanceof NextHop) { |
| NextHop other = (NextHop) obj; |
| return Objects.equals(nextHop, other.nextHop); |
| } |
| return false; |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(getClass()) |
| .add("nextHop", nextHop) |
| .toString(); |
| } |
| |
| @Override |
| public int compareTo(Object o) { |
| // TODO Auto-generated method stub |
| return 0; |
| } |
| } |