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.protocol.ver4;
18 import org.jboss.netty.buffer.ChannelBuffer;
19 import org.onosproject.bgpio.exceptions.BGPParseException;
20 import org.onosproject.bgpio.protocol.BGPMessageReader;
21 import org.onosproject.bgpio.protocol.BGPMessageWriter;
22 import org.onosproject.bgpio.protocol.BGPNotificationMsg;
23 import org.onosproject.bgpio.protocol.BGPType;
24 import org.onosproject.bgpio.protocol.BGPVersion;
25 import org.onosproject.bgpio.types.BGPErrorType;
26 import org.onosproject.bgpio.types.BGPHeader;
27 import org.slf4j.Logger;
28 import org.slf4j.LoggerFactory;
30 import com.google.common.base.MoreObjects;
33 * A NOTIFICATION message is sent when an error condition is detected. The BGP connection is closed immediately after it
36 class BGPNotificationMsgVer4 implements BGPNotificationMsg {
40 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
41 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
42 | Error code | Error subcode | Data (variable) |
43 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
47 protected static final Logger log = LoggerFactory.getLogger(BGPNotificationMsgVer4.class);
49 static final byte PACKET_VERSION = 4;
50 //BGPHeader(19) + Error code(1) + Error subcode(1)
51 static final int TOTAL_MESSAGE_MIN_LENGTH = 21;
52 static final int PACKET_MINIMUM_LENGTH = 2;
53 static final BGPType MSG_TYPE = BGPType.NOTIFICATION;
54 static final byte DEFAULT_ERRORSUBCODE = 0;
55 static final byte[] MARKER = {0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
57 static final byte MESSAGE_TYPE = 3;
58 static final BGPHeader DEFAULT_MESSAGE_HEADER = new BGPHeader(MARKER, BGPHeader.DEFAULT_HEADER_LENGTH,
61 private byte errorCode;
62 private byte errorSubCode;
64 private BGPHeader bgpHeader;
65 public static final BGPNotificationMsgVer4.Reader READER = new Reader();
70 public BGPNotificationMsgVer4() {
71 this.bgpHeader = null;
74 this.errorSubCode = 0;
78 * Constructor to initialize parameters.
80 * @param bgpHeader BGP Header in notification message
81 * @param errorCode error code
82 * @param errorSubCode error subcode
85 public BGPNotificationMsgVer4(BGPHeader bgpHeader, byte errorCode, byte errorSubCode, byte[] data) {
86 this.bgpHeader = bgpHeader;
88 this.errorCode = errorCode;
89 this.errorSubCode = errorSubCode;
93 * Reader reads BGP Notification Message from the channel buffer.
95 static class Reader implements BGPMessageReader<BGPNotificationMsg> {
97 public BGPNotificationMsg readFrom(ChannelBuffer cb, BGPHeader bgpHeader) throws BGPParseException {
100 if (cb.readableBytes() < PACKET_MINIMUM_LENGTH) {
101 throw new BGPParseException("Not enough readable bytes");
103 errorCode = cb.readByte();
104 errorSubCode = cb.readByte();
105 //Message Length = 21 + Data Length
106 int dataLength = bgpHeader.getLength() - TOTAL_MESSAGE_MIN_LENGTH;
107 byte[] data = new byte[dataLength];
108 cb.readBytes(data, 0, dataLength);
109 return new BGPNotificationMsgVer4(bgpHeader, errorCode, errorSubCode, data);
114 * Builder class for BGP notification message.
116 static class Builder implements BGPNotificationMsg.Builder {
117 private byte errorCode;
118 private byte errorSubCode;
120 private BGPHeader bgpHeader;
121 private boolean isErrorCodeSet = false;
122 private boolean isErrorSubCodeSet = false;
123 private boolean isBGPHeaderSet = false;
126 public BGPNotificationMsg build() throws BGPParseException {
127 BGPHeader bgpHeader = this.isBGPHeaderSet ? this.bgpHeader : DEFAULT_MESSAGE_HEADER;
128 if (!this.isErrorCodeSet) {
129 throw new BGPParseException("Error code must be present");
132 byte errorSubCode = this.isErrorSubCodeSet ? this.errorSubCode : DEFAULT_ERRORSUBCODE;
133 return new BGPNotificationMsgVer4(bgpHeader, this.errorCode, errorSubCode, this.data);
137 public Builder setErrorCode(byte errorCode) {
138 this.errorCode = errorCode;
139 this.isErrorCodeSet = true;
144 public Builder setErrorSubCode(byte errorSubCode) {
145 this.errorSubCode = errorSubCode;
146 this.isErrorSubCodeSet = true;
151 public Builder setData(byte[] data) {
157 public Builder setNotificationMsgHeader(BGPHeader header) {
158 this.bgpHeader = header;
159 this.isBGPHeaderSet = true;
164 public Builder setHeader(BGPHeader bgpMsgHeader) {
165 this.bgpHeader = bgpMsgHeader;
171 public BGPVersion getVersion() {
172 return BGPVersion.BGP_4;
176 public BGPType getType() {
177 return BGPType.NOTIFICATION;
181 public void writeTo(ChannelBuffer cb) throws BGPParseException {
182 WRITER.write(cb, this);
185 static final Writer WRITER = new Writer();
188 * Writer writes BGP notification message to channel buffer.
190 static class Writer implements BGPMessageWriter<BGPNotificationMsgVer4> {
192 public void write(ChannelBuffer cb, BGPNotificationMsgVer4 message) throws BGPParseException {
193 int msgStartIndex = cb.writerIndex();
194 int headerLenIndex = message.bgpHeader.write(cb);
195 if (headerLenIndex <= 0) {
196 throw new BGPParseException(BGPErrorType.MESSAGE_HEADER_ERROR, (byte) 0, null);
198 cb.writeByte(message.errorCode);
199 cb.writeByte(message.errorSubCode);
200 cb.writeBytes(message.data);
202 //Update message length field in notification message
203 int length = cb.writerIndex() - msgStartIndex;
204 cb.setShort(headerLenIndex, (short) length);
205 message.bgpHeader.setLength((short) length);
210 public byte getErrorCode() {
211 return this.errorCode;
215 * Sets errorcode with specified errorcode.
217 * @param errorCode field
219 public void setErrorCode(byte errorCode) {
220 this.errorCode = errorCode;
224 public byte getErrorSubCode() {
225 return this.errorSubCode;
229 * Sets error subcode with specified errorSubCode.
231 * @param errorSubCode field
233 public void setErrorSubCode(byte errorSubCode) {
234 this.errorSubCode = errorSubCode;
238 public byte[] getData() {
243 * Sets error data with specified data.
247 public void setData(byte[] data) {
252 public BGPHeader getHeader() {
253 return this.bgpHeader;
257 public String toString() {
258 return MoreObjects.toStringHelper(getClass())
260 .add("bgpHeader", bgpHeader)
262 .add("errorCode", errorCode)
263 .add("errorSubCode", errorSubCode)