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 | |
| 17 | package org.onosproject.isis.io.isispacket.pdu; |
| 18 | |
| 19 | import com.google.common.base.MoreObjects; |
| 20 | import com.google.common.base.Objects; |
| 21 | import com.google.common.primitives.Bytes; |
| 22 | import org.jboss.netty.buffer.ChannelBuffer; |
| 23 | import org.onosproject.isis.io.isispacket.IsisHeader; |
| 24 | import org.onosproject.isis.io.isispacket.tlv.IsisTlv; |
| 25 | import org.onosproject.isis.io.isispacket.tlv.TlvFinder; |
| 26 | import org.onosproject.isis.io.isispacket.tlv.TlvHeader; |
| 27 | import org.onosproject.isis.io.isispacket.tlv.TlvType; |
| 28 | import org.onosproject.isis.io.isispacket.tlv.TlvsToBytes; |
| 29 | import org.onosproject.isis.io.util.IsisUtil; |
| 30 | |
| 31 | import java.util.ArrayList; |
| 32 | import java.util.List; |
| 33 | |
| 34 | /** |
| 35 | * Representation of an ISIS Link State packet. |
| 36 | * Each Link State packet carries a collection of TLVs |
| 37 | * Several TLVs may be included in a single packet. |
| 38 | */ |
| 39 | public class LsPdu extends IsisHeader { |
| 40 | |
| 41 | /* |
| 42 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 43 | | Intra-domain Routing Protocol Discriminator | |
| 44 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 45 | | Length Indicator | |
| 46 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 47 | | Version/Protocol ID Extension | |
| 48 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 49 | | ID Length | |
| 50 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 51 | | R | R | R | PDU Type | |
| 52 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 53 | | Version | |
| 54 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 55 | | Reserved | |
| 56 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 57 | | Maximum area address | |
| 58 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 59 | | PDU Length | |
| 60 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 61 | | Remaining Lifetime | |
| 62 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 63 | | LSP ID | |
| 64 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 65 | | PDU Length | |
| 66 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 67 | | Sequence Number | |
| 68 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 69 | | Checksum | |
| 70 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 71 | | P | ATT | LSPDBOL | IS Type | |
| 72 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 73 | | Variable Lengths Fields | |
| 74 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 75 | |
| 76 | LS PDU Format |
| 77 | REFERENCE : ISO/IECĀ 10589 |
| 78 | */ |
| 79 | private int pduLength; |
| 80 | private int remainingLifeTime; |
| 81 | private String lspId; |
| 82 | private int sequenceNumber; |
| 83 | private int checkSum; |
| 84 | private boolean partitionRepair; |
| 85 | private AttachedToOtherAreas attachedToOtherAreas; |
| 86 | private boolean lspDbol; |
| 87 | private byte typeBlock; |
| 88 | private byte intermediateSystemType; |
| 89 | private List<IsisTlv> variableLengths = new ArrayList<>(); |
| 90 | |
| 91 | /** |
| 92 | * Creates an instance of Link State packet. |
| 93 | * Parameterized constructor which populate |
| 94 | * |
| 95 | * @param isisHeader isis header details |
| 96 | */ |
| 97 | public LsPdu(IsisHeader isisHeader) { |
| 98 | populateHeader(isisHeader); |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * Adds the isis tlv to the list for the link state PDU. |
| 103 | * |
| 104 | * @param isisTlv isis tlv |
| 105 | */ |
| 106 | public void addTlv(IsisTlv isisTlv) { |
| 107 | variableLengths.add(isisTlv); |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Returns the remaining time of the link state pdu. |
| 112 | * Number of seconds before LSP considered expired |
| 113 | * |
| 114 | * @return remainingTime remaining time |
| 115 | */ |
| 116 | public int remainingLifeTime() { |
| 117 | return remainingLifeTime; |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * Sets the remaining time for the link state pdu. |
| 122 | * |
| 123 | * @param remainingLifeTime remaining time |
| 124 | */ |
| 125 | public void setRemainingLifeTime(int remainingLifeTime) { |
| 126 | this.remainingLifeTime = remainingLifeTime; |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * Returns the link state database overload. |
| 131 | * |
| 132 | * @return lspdbol link state database overload |
| 133 | */ |
| 134 | public boolean lspDbol() { |
| 135 | return lspDbol; |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * Sets the link state database overload for this pdu. |
| 140 | * |
| 141 | * @param lspDbol link state database overload |
| 142 | */ |
| 143 | public void setLspDbol(boolean lspDbol) { |
| 144 | this.lspDbol = lspDbol; |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * Returns the type block. |
| 149 | * |
| 150 | * @return type block |
| 151 | */ |
| 152 | public byte typeBlock() { |
| 153 | return typeBlock; |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * Sets the type block. |
| 158 | * |
| 159 | * @param typeBlock type block |
| 160 | */ |
| 161 | public void setTypeBlock(byte typeBlock) { |
| 162 | this.typeBlock = typeBlock; |
| 163 | } |
| 164 | |
| 165 | /** |
| 166 | * Returns the sequence number of LSP. |
| 167 | * |
| 168 | * @return sequenceNumber sequence number |
| 169 | */ |
| 170 | public int sequenceNumber() { |
| 171 | return sequenceNumber; |
| 172 | } |
| 173 | |
| 174 | /** |
| 175 | * Sets the sequence nubmer for LSP. |
| 176 | * |
| 177 | * @param sequenceNumber sequence number |
| 178 | */ |
| 179 | public void setSequenceNumber(int sequenceNumber) { |
| 180 | this.sequenceNumber = sequenceNumber; |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * Returns the checksum of LSP from Source ID to end. |
| 185 | * |
| 186 | * @return checkSum check sum |
| 187 | */ |
| 188 | public int checkSum() { |
| 189 | return checkSum; |
| 190 | } |
| 191 | |
| 192 | /** |
| 193 | * Sets the checksum for LSP from Source ID to end. |
| 194 | * |
| 195 | * @param checkSum check sum |
| 196 | */ |
| 197 | public void setCheckSum(int checkSum) { |
| 198 | this.checkSum = checkSum; |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * Returns the partition repair value of the intermediate system. |
| 203 | * |
| 204 | * @return partitionRepair partition repair |
| 205 | */ |
| 206 | public boolean partitionRepair() { |
| 207 | return partitionRepair; |
| 208 | } |
| 209 | |
| 210 | /** |
| 211 | * Sets partition repair value for the intermediate system. |
| 212 | * |
| 213 | * @param partitionRepair partition repair |
| 214 | */ |
| 215 | public void setPartitionRepair(boolean partitionRepair) { |
| 216 | this.partitionRepair = partitionRepair; |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * Returns the value of intermediate system attached field. |
| 221 | * return values based on type Default Metric, Delay Metric, Expense Metric, Error Metric |
| 222 | * |
| 223 | * @return attachedToOtherAreas attached to other areas |
| 224 | */ |
| 225 | public AttachedToOtherAreas attachedToOtherAreas() { |
| 226 | return attachedToOtherAreas; |
| 227 | } |
| 228 | |
| 229 | /** |
| 230 | * Sets the value for intermediate system attached field. |
| 231 | * it will pass values based on type Default Metric, Delay Metric, Expense Metric, Error Metric |
| 232 | * |
| 233 | * @param attachedToOtherAreas attached to other areas |
| 234 | */ |
| 235 | public void setAttachedToOtherAreas(AttachedToOtherAreas attachedToOtherAreas) { |
| 236 | this.attachedToOtherAreas = attachedToOtherAreas; |
| 237 | } |
| 238 | |
| 239 | /** |
| 240 | * Returns the intermediate system type. |
| 241 | * type will be level 1 or level 2 |
| 242 | * |
| 243 | * @return intermediateSystemType intermediate system type |
| 244 | */ |
| 245 | public byte intermediateSystemType() { |
| 246 | return intermediateSystemType; |
| 247 | } |
| 248 | |
| 249 | /** |
| 250 | * Sets the value for intermediate system. |
| 251 | * type will be level 1 or level 2 |
| 252 | * |
| 253 | * @param intermediateSystemType intermediate system type |
| 254 | */ |
| 255 | public void setIntermediateSystemType(byte intermediateSystemType) { |
| 256 | this.intermediateSystemType = intermediateSystemType; |
| 257 | } |
| 258 | |
| 259 | /** |
| 260 | * Returns the link state ID of link state packet. |
| 261 | * System ID of the source of link state PDU |
| 262 | * |
| 263 | * @return lspId link state packet ID |
| 264 | */ |
| 265 | public String lspId() { |
| 266 | return lspId; |
| 267 | } |
| 268 | |
| 269 | /** |
| 270 | * Sets the link state ID for link state packet. |
| 271 | * System ID of the source of link state PDU |
| 272 | * |
| 273 | * @param lspId link state packet ID |
| 274 | */ |
| 275 | public void setLspId(String lspId) { |
| 276 | this.lspId = lspId; |
| 277 | } |
| 278 | |
| 279 | /** |
| 280 | * Returns the packet data unit length of link state packet. |
| 281 | * Entire length of this PDU, in octets |
| 282 | * |
tejeshwer degala | 3fe1ed5 | 2016-04-22 17:04:01 +0530 | [diff] [blame^] | 283 | * @return pduLength packet data unit length |
Dhruv Dhody | e64b93e | 2016-04-20 19:26:55 +0530 | [diff] [blame] | 284 | */ |
| 285 | public int pduLength() { |
| 286 | return pduLength; |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * Sets the packet data unit length for link state packet. |
| 291 | * Entire Length of this PDU, in octets |
| 292 | * |
tejeshwer degala | 3fe1ed5 | 2016-04-22 17:04:01 +0530 | [diff] [blame^] | 293 | * @param pduLength packet data length |
Dhruv Dhody | e64b93e | 2016-04-20 19:26:55 +0530 | [diff] [blame] | 294 | */ |
| 295 | public void setPduLength(int pduLength) { |
| 296 | this.pduLength = pduLength; |
| 297 | } |
| 298 | |
| 299 | @Override |
| 300 | public void readFrom(ChannelBuffer channelBuffer) { |
| 301 | |
| 302 | this.setPduLength(channelBuffer.readUnsignedShort()); |
| 303 | this.setRemainingLifeTime(channelBuffer.readUnsignedShort()); |
| 304 | //lsp id + 2 value |
| 305 | byte[] tempByteArray = new byte[IsisUtil.ID_PLUS_TWO_BYTE]; |
| 306 | channelBuffer.readBytes(tempByteArray, 0, IsisUtil.ID_PLUS_TWO_BYTE); |
| 307 | this.setLspId(IsisUtil.systemIdPlus(tempByteArray)); |
| 308 | //sequence number 4 |
| 309 | this.setSequenceNumber(channelBuffer.readInt()); |
| 310 | this.setCheckSum(channelBuffer.readUnsignedShort()); |
| 311 | int typeTemp = channelBuffer.readUnsignedByte(); |
| 312 | byte isTypeByte = (byte) typeTemp; |
| 313 | String tempValue = String.format("%8s", Integer.toBinaryString(isTypeByte & 0xFF)).replace(' ', '0'); |
| 314 | int pBit = Integer.parseInt(new Character(tempValue.charAt(0)).toString()); |
| 315 | if (pBit == 1) { |
| 316 | this.setPartitionRepair(true); |
| 317 | } else { |
| 318 | this.setPartitionRepair(false); |
| 319 | } |
| 320 | int attValue = Integer.parseInt(tempValue.substring(1, 5), 2); |
| 321 | switch (AttachedToOtherAreas.get(attValue)) { |
| 322 | case DEFAULTMETRIC: |
| 323 | this.setAttachedToOtherAreas(AttachedToOtherAreas.DEFAULTMETRIC); |
| 324 | break; |
| 325 | case DELAYMETRIC: |
| 326 | this.setAttachedToOtherAreas(AttachedToOtherAreas.DELAYMETRIC); |
| 327 | break; |
| 328 | case EXPENSEMETRIC: |
| 329 | this.setAttachedToOtherAreas(AttachedToOtherAreas.EXPENSEMETRIC); |
| 330 | break; |
| 331 | case ERRORMETRIC: |
| 332 | this.setAttachedToOtherAreas(AttachedToOtherAreas.ERRORMETRIC); |
| 333 | break; |
| 334 | case NONE: |
| 335 | this.setAttachedToOtherAreas(AttachedToOtherAreas.NONE); |
| 336 | break; |
| 337 | default: |
| 338 | break; |
| 339 | } |
| 340 | int lspdbol = Integer.parseInt(new Character(tempValue.charAt(5)).toString()); |
| 341 | if (lspdbol == 1) { |
| 342 | this.setLspDbol(true); |
| 343 | } else { |
| 344 | this.setLspDbol(false); |
| 345 | } |
| 346 | int isType = Integer.parseInt(tempValue.substring(6, 8), 2); |
| 347 | byte isTypeByteValue = (byte) isType; |
| 348 | this.setIntermediateSystemType(isTypeByteValue); |
| 349 | //tlv here |
| 350 | while (channelBuffer.readableBytes() > 0) { |
| 351 | TlvHeader tlvHeader = new TlvHeader(); |
| 352 | tlvHeader.setTlvType(channelBuffer.readUnsignedByte()); |
| 353 | tlvHeader.setTlvLength(channelBuffer.readUnsignedByte()); |
| 354 | TlvType tlvValue = TlvType.get(tlvHeader.tlvType()); |
| 355 | if (tlvValue != null) { |
| 356 | IsisTlv tlv = TlvFinder.findTlv(tlvHeader, channelBuffer.readBytes(tlvHeader.tlvLength())); |
| 357 | this.variableLengths.add(tlv); |
| 358 | } else { |
| 359 | channelBuffer.readBytes(tlvHeader.tlvLength()); |
| 360 | } |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | @Override |
| 365 | public byte[] asBytes() { |
| 366 | byte[] lspMessage = null; |
| 367 | byte[] helloHeader = l1l2IsisPduHeader(); |
| 368 | byte[] lspBody = l1l2LsPduBody(); |
| 369 | lspMessage = Bytes.concat(helloHeader, lspBody); |
| 370 | return lspMessage; |
| 371 | } |
| 372 | |
| 373 | /** |
| 374 | * Builds ISIS PDU header from ISIS message. |
| 375 | * |
| 376 | * @return headerList ISIS PDU header |
| 377 | */ |
| 378 | public byte[] l1l2IsisPduHeader() { |
| 379 | List<Byte> headerList = new ArrayList<>(); |
| 380 | headerList.add(this.irpDiscriminator()); |
| 381 | headerList.add((byte) IsisUtil.getPduHeaderLength(this.pduType())); |
| 382 | headerList.add(this.version()); |
| 383 | headerList.add(this.idLength()); |
| 384 | headerList.add((byte) this.pduType()); |
| 385 | headerList.add(this.version2()); |
| 386 | headerList.add(this.reserved()); |
| 387 | headerList.add(this.maximumAreaAddresses()); |
| 388 | return Bytes.toArray(headerList); |
| 389 | } |
| 390 | |
| 391 | /** |
| 392 | * Builds link state PDU body from ISIS message. |
| 393 | * |
| 394 | * @return bodyList link state PDU body |
| 395 | */ |
| 396 | public byte[] l1l2LsPduBody() { |
| 397 | List<Byte> bodyList = new ArrayList<>(); |
| 398 | bodyList.addAll(Bytes.asList(IsisUtil.convertToTwoBytes(this.pduLength()))); |
| 399 | bodyList.addAll(Bytes.asList(IsisUtil.convertToTwoBytes(this.remainingLifeTime()))); |
| 400 | bodyList.addAll(IsisUtil.sourceAndLanIdToBytes(this.lspId())); |
| 401 | bodyList.addAll(Bytes.asList(IsisUtil.convertToFourBytes(this.sequenceNumber()))); |
| 402 | bodyList.addAll(Bytes.asList(IsisUtil.convertToTwoBytes(this.checkSum()))); |
| 403 | String temString = ""; |
| 404 | if (this.partitionRepair()) { |
| 405 | temString = "1" + temString; |
| 406 | } else { |
| 407 | temString = "0" + temString; |
| 408 | } |
| 409 | switch (this.attachedToOtherAreas()) { |
| 410 | case ERRORMETRIC: |
| 411 | temString = temString + "1000"; |
| 412 | break; |
| 413 | case EXPENSEMETRIC: |
| 414 | temString = temString + "0100"; |
| 415 | break; |
| 416 | case DELAYMETRIC: |
| 417 | temString = temString + "0010"; |
| 418 | break; |
| 419 | case DEFAULTMETRIC: |
| 420 | temString = temString + "0001"; |
| 421 | break; |
| 422 | case NONE: |
| 423 | temString = temString + "0000"; |
| 424 | break; |
| 425 | default: |
| 426 | break; |
| 427 | } |
| 428 | if (this.lspDbol()) { |
| 429 | temString = temString + "1"; |
| 430 | } else { |
| 431 | temString = temString + "0"; |
| 432 | } |
| 433 | String isType = Integer.toBinaryString(this.intermediateSystemType()); |
| 434 | if (isType.length() % 2 != 0) { |
| 435 | isType = "0" + isType; |
| 436 | } |
| 437 | temString = temString + isType; |
| 438 | bodyList.add((byte) Integer.parseInt(temString, 2)); |
| 439 | for (IsisTlv isisTlv : variableLengths) { |
| 440 | bodyList.addAll(TlvsToBytes.tlvToBytes(isisTlv)); |
| 441 | } |
| 442 | return Bytes.toArray(bodyList); |
| 443 | } |
| 444 | |
| 445 | @Override |
| 446 | public String toString() { |
| 447 | return MoreObjects.toStringHelper(getClass()) |
| 448 | .omitNullValues() |
| 449 | .add("pduLength", pduLength) |
| 450 | .add("remainingLifeTime", remainingLifeTime) |
| 451 | .add("lspId", lspId) |
| 452 | .add("sequenceNumber", sequenceNumber) |
| 453 | .add("checkSum", checkSum) |
| 454 | .add("partitionRepair", partitionRepair) |
| 455 | .add("lspDbol", lspDbol) |
| 456 | .add("typeBlock", typeBlock) |
| 457 | .add("intermediateSystemType", intermediateSystemType) |
| 458 | .toString(); |
| 459 | } |
| 460 | |
| 461 | @Override |
| 462 | public boolean equals(Object o) { |
| 463 | if (this == o) { |
| 464 | return true; |
| 465 | } |
| 466 | if (o == null || getClass() != o.getClass()) { |
| 467 | return false; |
| 468 | } |
| 469 | LsPdu that = (LsPdu) o; |
| 470 | return Objects.equal(pduLength, that.pduLength) && |
| 471 | Objects.equal(remainingLifeTime, that.remainingLifeTime) && |
| 472 | Objects.equal(lspId, that.lspId) && |
| 473 | Objects.equal(sequenceNumber, that.sequenceNumber) && |
| 474 | Objects.equal(checkSum, that.checkSum) && |
| 475 | Objects.equal(partitionRepair, that.partitionRepair) && |
| 476 | Objects.equal(lspDbol, that.lspDbol) && |
| 477 | Objects.equal(typeBlock, that.typeBlock) && |
| 478 | Objects.equal(intermediateSystemType, that.intermediateSystemType); |
| 479 | } |
| 480 | |
| 481 | @Override |
| 482 | public int hashCode() { |
| 483 | return Objects.hashCode(pduLength, remainingLifeTime, lspId, sequenceNumber, |
| 484 | checkSum, partitionRepair, lspDbol, typeBlock, intermediateSystemType); |
| 485 | } |
| 486 | } |