2 * Copyright 2015 Open Networking Laboratory
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 package org.onosproject.bgpio.types;
18 import java.util.Objects;
20 import org.jboss.netty.buffer.ChannelBuffer;
21 import org.onlab.packet.IpPrefix;
22 import org.onosproject.bgpio.util.Validation;
23 import org.slf4j.Logger;
24 import org.slf4j.LoggerFactory;
26 import com.google.common.base.MoreObjects;
29 * Provides IP Reachability InformationTlv Tlv which contains IP Prefix.
31 public class IPReachabilityInformationTlv implements BGPValueType {
34 * Reference :draft-ietf-idr-ls-distribution-11
37 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
38 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
40 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
41 | Prefix Length | IP Prefix (variable) //
42 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
44 Figure 14: IP Reachability Information TLV Format
47 protected static final Logger log = LoggerFactory.getLogger(IPReachabilityInformationTlv.class);
49 public static final short TYPE = 265;
50 public static final int ONE_BYTE_LEN = 8;
51 private byte prefixLen;
52 private byte[] ipPrefix;
56 * Constructor to initialize parameters.
58 * @param prefixLen length of IP Prefix
59 * @param ipPrefix IP Prefix
60 * @param length length of value field
62 public IPReachabilityInformationTlv(byte prefixLen, byte[] ipPrefix, short length) {
63 this.ipPrefix = ipPrefix;
64 this.prefixLen = prefixLen;
73 public IpPrefix getPrefixValue() {
74 IpPrefix prefix = Validation.bytesToPrefix(ipPrefix, prefixLen);
79 * Returns IP Prefix length.
81 * @return IP Prefix length
83 public byte getPrefixLen() {
84 return this.prefixLen;
88 public int hashCode() {
89 return Objects.hash(ipPrefix, prefixLen);
93 public boolean equals(Object obj) {
98 if (obj instanceof IPReachabilityInformationTlv) {
99 IPReachabilityInformationTlv other = (IPReachabilityInformationTlv) obj;
100 return Objects.equals(prefixLen, other.prefixLen) && Objects.equals(ipPrefix, other.ipPrefix);
106 public int write(ChannelBuffer cb) {
107 int iLenStartIndex = cb.writerIndex();
109 cb.writeShort(length);
110 cb.writeByte(prefixLen);
111 cb.writeBytes(ipPrefix);
112 return cb.writerIndex() - iLenStartIndex;
116 * Reads the channel buffer and returns object of IPReachabilityInformationTlv.
118 * @param cb ChannelBuffer
119 * @param length of value field
120 * @return object of IPReachabilityInformationTlv
122 public static IPReachabilityInformationTlv read(ChannelBuffer cb, short length) {
123 byte preficLen = cb.readByte();
125 if (preficLen == 0) {
126 prefix = new byte[] {0};
128 int len = preficLen / ONE_BYTE_LEN;
129 int reminder = preficLen % ONE_BYTE_LEN;
133 prefix = new byte[len];
134 cb.readBytes(prefix, 0, len);
136 return IPReachabilityInformationTlv.of(preficLen, prefix, length);
139 public static IPReachabilityInformationTlv of(final byte preficLen, final byte[] prefix, final short length) {
140 return new IPReachabilityInformationTlv(preficLen, prefix, length);
143 public short getType() {
148 public String toString() {
149 return MoreObjects.toStringHelper(getClass())
151 .add("Length", length)
152 .add("Prefixlength", getPrefixLen())
153 .add("Prefixvalue", getPrefixValue())