Dhruv Dhody | e64b93e | 2016-04-20 19:26:55 +0530 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2016-present Open Networking Laboratory |
| 3 | * |
| 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 |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 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. |
| 15 | */ |
| 16 | package org.onosproject.isis.io.isispacket.pdu; |
| 17 | |
| 18 | import com.google.common.base.MoreObjects; |
| 19 | import com.google.common.base.Objects; |
| 20 | import com.google.common.primitives.Bytes; |
| 21 | import org.jboss.netty.buffer.ChannelBuffer; |
| 22 | import org.onosproject.isis.io.isispacket.IsisHeader; |
| 23 | import org.onosproject.isis.io.isispacket.tlv.IsisTlv; |
| 24 | import org.onosproject.isis.io.isispacket.tlv.TlvFinder; |
| 25 | import org.onosproject.isis.io.isispacket.tlv.TlvHeader; |
| 26 | import org.onosproject.isis.io.isispacket.tlv.TlvType; |
| 27 | import org.onosproject.isis.io.isispacket.tlv.TlvsToBytes; |
| 28 | import org.onosproject.isis.io.util.IsisUtil; |
| 29 | |
| 30 | import java.util.ArrayList; |
| 31 | import java.util.List; |
| 32 | |
| 33 | /** |
| 34 | * Representation of complete sequence number PDU. |
| 35 | */ |
| 36 | public class Csnp extends IsisHeader { |
| 37 | |
| 38 | /* |
| 39 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 40 | | Intra-domain Routing Protocol Discriminator | |
| 41 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 42 | | Length Indicator | |
| 43 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 44 | | Version/Protocol ID Extension | |
| 45 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 46 | | ID Length | |
| 47 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 48 | | R | R | R | PDU Type | |
| 49 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 50 | | Version | |
| 51 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 52 | | Reserved | |
| 53 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 54 | | Maximum area address | |
| 55 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 56 | | PDU Length | |
| 57 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 58 | | Source ID | |
| 59 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 60 | | Start LSP ID | |
| 61 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 62 | | End LSP ID | |
| 63 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 64 | | Variable Lengths Fields | |
| 65 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 66 | |
| 67 | CSNP Message Format |
| 68 | REFERENCE : ISO/IECĀ 10589 |
| 69 | */ |
| 70 | private int pduLength; |
| 71 | private String sourceId; |
| 72 | private String startLspId; |
| 73 | private String endLspId; |
| 74 | private List<IsisTlv> variableLengths = new ArrayList<>(); |
| 75 | |
| 76 | /** |
| 77 | * Creates the instance for this class. |
| 78 | * |
| 79 | * @param isisHeader ISIS header |
| 80 | */ |
| 81 | public Csnp(IsisHeader isisHeader) { |
| 82 | populateHeader(isisHeader); |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Returns the list of all tlvs. |
| 87 | * |
| 88 | * @return variableLengths list of tlvs |
| 89 | */ |
| 90 | public List<IsisTlv> getAllTlv() { |
| 91 | return variableLengths; |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Returns the source ID of csnp. |
| 96 | * |
| 97 | * @return sourceId source ID |
| 98 | */ |
| 99 | public String sourceId() { |
| 100 | return sourceId; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Sets the source ID for csnp. |
| 105 | * |
| 106 | * @param sourceId source ID |
| 107 | */ |
| 108 | public void setSourceId(String sourceId) { |
| 109 | this.sourceId = sourceId; |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Returns the initial link state packet ID of csnp. |
| 114 | * |
| 115 | * @return startLspId start link state packet ID |
| 116 | */ |
| 117 | public String startLspId() { |
| 118 | return startLspId; |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * Sets the initial link state packet ID for csnp. |
| 123 | * |
| 124 | * @param startLspId start link state packet ID |
| 125 | */ |
| 126 | public void setStartLspId(String startLspId) { |
| 127 | this.startLspId = startLspId; |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * Returns the end link state packet ID of csnp. |
| 132 | * |
| 133 | * @return endLspId end link state packet ID of csnp. |
| 134 | */ |
| 135 | public String endLspId() { |
| 136 | return endLspId; |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * Sets the end link state packet ID for csnp. |
| 141 | * |
| 142 | * @param endLspId end link state packet ID of csnp. |
| 143 | */ |
| 144 | public void setEndLspId(String endLspId) { |
| 145 | this.endLspId = endLspId; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Returns the packet data unit length of link state packet. |
| 150 | * Entire length of this PDU, in octets |
| 151 | * |
| 152 | * @return pduLength packet date unit length |
| 153 | */ |
| 154 | public int pduLength() { |
| 155 | return pduLength; |
| 156 | } |
| 157 | |
| 158 | /** |
| 159 | * Sets the packet data unit length for link state packet. |
| 160 | * Entire Length of this PDU, in octets |
| 161 | * |
| 162 | * @param pduLength packet data length |
| 163 | */ |
| 164 | public void setPduLength(int pduLength) { |
| 165 | this.pduLength = pduLength; |
| 166 | } |
| 167 | |
| 168 | @Override |
| 169 | public void readFrom(ChannelBuffer channelBuffer) { |
| 170 | this.setPduLength(channelBuffer.readUnsignedShort()); |
| 171 | //source id + 1 value |
| 172 | byte[] tempByteArray = new byte[IsisUtil.ID_PLUS_ONE_BYTE]; |
| 173 | channelBuffer.readBytes(tempByteArray, 0, IsisUtil.ID_PLUS_ONE_BYTE); |
| 174 | this.setSourceId(IsisUtil.systemIdPlus(tempByteArray)); |
| 175 | //start lsp id + 2 value |
| 176 | tempByteArray = new byte[IsisUtil.ID_PLUS_TWO_BYTE]; |
| 177 | channelBuffer.readBytes(tempByteArray, 0, IsisUtil.ID_PLUS_TWO_BYTE); |
| 178 | this.setStartLspId(IsisUtil.systemIdPlus(tempByteArray)); |
| 179 | //end lsp id + 2 value |
| 180 | tempByteArray = new byte[IsisUtil.ID_PLUS_TWO_BYTE]; |
| 181 | channelBuffer.readBytes(tempByteArray, 0, IsisUtil.ID_PLUS_TWO_BYTE); |
| 182 | this.setEndLspId(IsisUtil.systemIdPlus(tempByteArray)); |
| 183 | //tlv here |
| 184 | while (channelBuffer.readableBytes() > 0) { |
| 185 | TlvHeader tlvHeader = new TlvHeader(); |
| 186 | tlvHeader.setTlvType(channelBuffer.readUnsignedByte()); |
| 187 | tlvHeader.setTlvLength(channelBuffer.readUnsignedByte()); |
| 188 | TlvType tlvValue = TlvType.get(tlvHeader.tlvType()); |
| 189 | if (tlvValue != null) { |
| 190 | IsisTlv tlv = TlvFinder.findTlv(tlvHeader, channelBuffer.readBytes(tlvHeader.tlvLength())); |
| 191 | this.variableLengths.add(tlv); |
| 192 | } else { |
| 193 | channelBuffer.readBytes(tlvHeader.tlvLength()); |
| 194 | } |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | @Override |
| 199 | public byte[] asBytes() { |
| 200 | byte[] csnpMessage = null; |
| 201 | byte[] isisPduHeader = isisPduHeader(); |
| 202 | byte[] csnpBody = completeSequenceNumberPduBody(); |
| 203 | csnpMessage = Bytes.concat(isisPduHeader, csnpBody); |
| 204 | return csnpMessage; |
| 205 | } |
| 206 | |
| 207 | /** |
| 208 | * Builds ISIS PDU header for complete sequence numbers PDU. |
| 209 | * |
| 210 | * @return isisPduHeader ISIS PDU header |
| 211 | */ |
| 212 | public byte[] isisPduHeader() { |
| 213 | List<Byte> headerList = new ArrayList<>(); |
| 214 | headerList.add(this.irpDiscriminator()); |
| 215 | headerList.add((byte) IsisUtil.getPduHeaderLength(this.pduType())); |
| 216 | headerList.add(this.version()); |
| 217 | headerList.add(this.idLength()); |
| 218 | headerList.add((byte) this.pduType()); |
| 219 | headerList.add(this.version2()); |
| 220 | headerList.add(this.reserved()); |
| 221 | headerList.add(this.maximumAreaAddresses()); |
| 222 | return Bytes.toArray(headerList); |
| 223 | } |
| 224 | |
| 225 | /** |
| 226 | * Builds complete sequence numbers PDU body. |
| 227 | * |
| 228 | * @return bodyList complete sequence numbers PDU body |
| 229 | */ |
| 230 | public byte[] completeSequenceNumberPduBody() { |
| 231 | List<Byte> bodyList = new ArrayList<>(); |
| 232 | bodyList.addAll(Bytes.asList(IsisUtil.convertToTwoBytes(this.pduLength()))); |
| 233 | bodyList.addAll(IsisUtil.sourceAndLanIdToBytes(this.sourceId())); |
| 234 | bodyList.addAll(IsisUtil.sourceAndLanIdToBytes(this.startLspId())); |
| 235 | bodyList.addAll(IsisUtil.sourceAndLanIdToBytes(this.endLspId())); |
| 236 | for (IsisTlv isisTlv : variableLengths) { |
| 237 | bodyList.addAll(TlvsToBytes.tlvToBytes(isisTlv)); |
| 238 | } |
| 239 | return Bytes.toArray(bodyList); |
| 240 | } |
| 241 | |
| 242 | @Override |
| 243 | public String toString() { |
| 244 | return MoreObjects.toStringHelper(getClass()) |
| 245 | .omitNullValues() |
| 246 | .add("pduLength", pduLength) |
| 247 | .add("sourceId", sourceId) |
| 248 | .add("startLspId", startLspId) |
| 249 | .add("endLspId", endLspId) |
| 250 | .toString(); |
| 251 | } |
| 252 | |
| 253 | @Override |
| 254 | public boolean equals(Object o) { |
| 255 | if (this == o) { |
| 256 | return true; |
| 257 | } |
| 258 | if (o == null || getClass() != o.getClass()) { |
| 259 | return false; |
| 260 | } |
| 261 | Csnp that = (Csnp) o; |
| 262 | return Objects.equal(pduLength, that.pduLength) && |
| 263 | Objects.equal(sourceId, that.sourceId) && |
| 264 | Objects.equal(startLspId, that.startLspId) && |
| 265 | Objects.equal(endLspId, that.endLspId); |
| 266 | } |
| 267 | |
| 268 | @Override |
| 269 | public int hashCode() { |
| 270 | return Objects.hashCode(pduLength, sourceId, startLspId, endLspId); |
| 271 | } |
| 272 | } |