| /* |
| * 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.bgpio.types; |
| |
| import java.nio.ByteBuffer; |
| import java.util.Arrays; |
| import java.util.Objects; |
| |
| import org.jboss.netty.buffer.ChannelBuffer; |
| import org.onlab.packet.IpPrefix; |
| import org.onosproject.bgpio.util.Validation; |
| |
| import com.google.common.base.MoreObjects; |
| |
| /** |
| * Provides IP Reachability InformationTlv Tlv which contains IP Prefix. |
| */ |
| public class IPReachabilityInformationTlv implements BgpValueType { |
| |
| /* |
| * Reference :draft-ietf-idr-ls-distribution-11 |
| |
| 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 | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | Prefix Length | IP Prefix (variable) // |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| |
| Figure 14: IP Reachability Information TLV Format |
| */ |
| |
| public static final short TYPE = 265; |
| public static final int ONE_BYTE_LEN = 8; |
| |
| private byte prefixLen; |
| private byte[] ipPrefix; |
| public short length; |
| |
| /** |
| * Constructor to initialize parameters. |
| * |
| * @param prefixLen length of IP Prefix |
| * @param ipPrefix IP Prefix |
| * @param length length of value field |
| */ |
| public IPReachabilityInformationTlv(byte prefixLen, byte[] ipPrefix, short length) { |
| this.ipPrefix = ipPrefix; |
| this.prefixLen = prefixLen; |
| this.length = length; |
| } |
| |
| /** |
| * Returns IP Prefix. |
| * |
| * @return IP Prefix |
| */ |
| public IpPrefix getPrefixValue() { |
| IpPrefix prefix = Validation.bytesToPrefix(ipPrefix, prefixLen); |
| return prefix; |
| } |
| |
| /** |
| * Returns IP Prefix length. |
| * |
| * @return IP Prefix length |
| */ |
| public byte getPrefixLen() { |
| return this.prefixLen; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(Arrays.hashCode(ipPrefix), prefixLen); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| |
| if (obj instanceof IPReachabilityInformationTlv) { |
| IPReachabilityInformationTlv other = (IPReachabilityInformationTlv) obj; |
| return Objects.equals(prefixLen, other.prefixLen) && Arrays.equals(ipPrefix, other.ipPrefix); |
| } |
| return false; |
| } |
| |
| @Override |
| public int write(ChannelBuffer cb) { |
| int iLenStartIndex = cb.writerIndex(); |
| cb.writeShort(TYPE); |
| cb.writeShort(length); |
| cb.writeByte(prefixLen); |
| cb.writeBytes(ipPrefix); |
| return cb.writerIndex() - iLenStartIndex; |
| } |
| |
| /** |
| * Reads the channel buffer and returns object of IPReachabilityInformationTlv. |
| * |
| * @param cb ChannelBuffer |
| * @param length of value field |
| * @return object of IPReachabilityInformationTlv |
| */ |
| public static IPReachabilityInformationTlv read(ChannelBuffer cb, short length) { |
| byte preficLen = cb.readByte(); |
| byte[] prefix; |
| if (preficLen == 0) { |
| prefix = new byte[] {0}; |
| } else { |
| int len = preficLen / ONE_BYTE_LEN; |
| int reminder = preficLen % ONE_BYTE_LEN; |
| if (reminder > 0) { |
| len = len + 1; |
| } |
| prefix = new byte[len]; |
| cb.readBytes(prefix, 0, len); |
| } |
| return IPReachabilityInformationTlv.of(preficLen, prefix, length); |
| } |
| |
| public static IPReachabilityInformationTlv of(final byte preficLen, final byte[] prefix, final short length) { |
| return new IPReachabilityInformationTlv(preficLen, prefix, length); |
| } |
| @Override |
| public short getType() { |
| return TYPE; |
| } |
| |
| @Override |
| public int compareTo(Object o) { |
| if (this.equals(o)) { |
| return 0; |
| } |
| ByteBuffer value1 = ByteBuffer.wrap(this.ipPrefix); |
| ByteBuffer value2 = ByteBuffer.wrap(((IPReachabilityInformationTlv) o).ipPrefix); |
| return value1.compareTo(value2); |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(getClass()) |
| .add("Type", TYPE) |
| .add("Length", length) |
| .add("Prefixlength", getPrefixLen()) |
| .add("Prefixvalue", getPrefixValue()) |
| .toString(); |
| } |
| } |