Daniele Moro | 94660a0 | 2019-12-02 12:02:07 -0800 | [diff] [blame] | 1 | /* |
Joey Armstrong | a68e785 | 2024-01-28 13:27:02 -0500 | [diff] [blame^] | 2 | * Copyright 2019-2024 Open Networking Foundation (ONF) and the ONF Contributors |
Daniele Moro | 94660a0 | 2019-12-02 12:02:07 -0800 | [diff] [blame] | 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.opencord.bng.packets; |
| 18 | |
| 19 | import com.google.common.base.Objects; |
| 20 | import com.google.common.collect.ImmutableMap; |
| 21 | import org.onlab.packet.BasePacket; |
| 22 | import org.onlab.packet.Data; |
| 23 | import org.onlab.packet.Deserializer; |
| 24 | import org.onlab.packet.Ethernet; |
| 25 | import org.onlab.packet.IPacket; |
| 26 | import org.onlab.packet.IPv4; |
| 27 | import org.onlab.packet.IPv6; |
| 28 | |
| 29 | import java.nio.ByteBuffer; |
| 30 | import java.util.LinkedList; |
| 31 | import java.util.List; |
| 32 | |
| 33 | import static com.google.common.base.MoreObjects.toStringHelper; |
| 34 | import static org.onlab.packet.PacketUtils.checkHeaderLength; |
| 35 | import static org.onlab.packet.PacketUtils.checkInput; |
| 36 | |
| 37 | /** |
| 38 | * Implements PPPoE packet format. |
| 39 | */ |
| 40 | public class Pppoe extends BasePacket { |
| 41 | |
| 42 | public static final short TYPE_PPPOED = (short) 0x8863; |
| 43 | public static final short TYPE_PPPOES = (short) 0x8864; |
| 44 | |
| 45 | static final ImmutableMap<Short, Deserializer<? extends IPacket>> PROTOCOL_DESERIALIZER_MAP = |
| 46 | ImmutableMap.<Short, Deserializer<? extends IPacket>>builder() |
| 47 | //FIXME: write the correct parser for LCP, PAP, and CHAP |
| 48 | .put(PppProtocolType.LCP.code(), GenericPpp.deserializer()) |
| 49 | .put(PppProtocolType.PAP.code(), GenericPpp.deserializer()) |
| 50 | .put(PppProtocolType.CHAP.code(), GenericPpp.deserializer()) |
| 51 | .put(PppProtocolType.IPCP.code(), Ipcp.deserializer()) |
| 52 | .put(PppProtocolType.IPv4.code(), IPv4.deserializer()) |
| 53 | .put(PppProtocolType.IPv6.code(), IPv6.deserializer()) |
| 54 | .build(); |
| 55 | // Account of PPPoE standard header |
| 56 | static final int HEADER_LENGTH = 6; |
| 57 | // Fields part of PPPoE |
| 58 | private byte version; // 4bit |
| 59 | private byte typeId; // 4bit |
| 60 | private PppoeType packetType; // 8bit => code in PPPoE header |
| 61 | private short sessionId; // 16bit |
| 62 | private short payloadLength; // 16bit |
| 63 | // FIXME: use PPPProtocol enum type |
| 64 | private short pppProtocol = 0; |
| 65 | //TODO: TLV TAGs (ref. to RFC2516) |
| 66 | private PppoeTlvTag acName = null; |
| 67 | private PppoeTlvTag serviceName = null; |
| 68 | private List<PppoeTlvTag> optionalTagTlvList; |
| 69 | |
| 70 | public Pppoe() { |
| 71 | super(); |
| 72 | optionalTagTlvList = new LinkedList<>(); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Get the packet type. |
| 77 | * |
| 78 | * @return the packet type |
| 79 | */ |
| 80 | public PppoeType getPacketType() { |
| 81 | return packetType; |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Set the Packet Type. |
| 86 | * |
| 87 | * @param type The packet type to set |
| 88 | * @return this |
| 89 | */ |
| 90 | public Pppoe setPacketType(PppoeType type) { |
| 91 | this.packetType = type; |
| 92 | return this; |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * Get the session ID. |
| 97 | * |
| 98 | * @return the session ID |
| 99 | */ |
| 100 | public short getSessionId() { |
| 101 | return this.sessionId; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Set the session ID. |
| 106 | * |
| 107 | * @param sessionId the session ID to set |
| 108 | * @return this |
| 109 | */ |
| 110 | public Pppoe setSessionId(short sessionId) { |
| 111 | this.sessionId = sessionId; |
| 112 | return this; |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Get the Point-to-Point Protocol. |
| 117 | * |
| 118 | * @return the Point-to-Point Protocol |
| 119 | */ |
| 120 | public short getPppProtocol() { |
| 121 | return this.pppProtocol; |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Get the AC-Name. |
| 126 | * |
| 127 | * @return the AC-Name |
| 128 | */ |
| 129 | public PppoeTlvTag getAcName() { |
| 130 | return this.acName; |
| 131 | } |
| 132 | |
| 133 | /** |
| 134 | * Set the AC-Name. |
| 135 | * |
| 136 | * @param acname AC-Name to set |
| 137 | * @return this |
| 138 | */ |
| 139 | public Pppoe setAcName(final PppoeTlvTag acname) { |
| 140 | this.acName = acname; |
| 141 | return this; |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Get the PPPoE version field. |
| 146 | * |
| 147 | * @return The version field |
| 148 | */ |
| 149 | public byte getVersion() { |
| 150 | return this.version; |
| 151 | } |
| 152 | |
| 153 | /** |
| 154 | * Set the version field. |
| 155 | * |
| 156 | * @param version version to set |
| 157 | * @return this |
| 158 | */ |
| 159 | public Pppoe setVersion(byte version) { |
| 160 | this.version = (byte) (version & 0xF); |
| 161 | return this; |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * Get the PPPoE type ID. |
| 166 | * |
| 167 | * @return The type ID |
| 168 | */ |
| 169 | public short getTypeId() { |
| 170 | return this.typeId; |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * Set the type ID. |
| 175 | * |
| 176 | * @param typeId Type ID to set |
| 177 | * @return this |
| 178 | */ |
| 179 | public Pppoe setTypeId(byte typeId) { |
| 180 | this.typeId = (byte) (typeId & 0xF); |
| 181 | return this; |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * Get the PPPoE payload length header field. |
| 186 | * |
| 187 | * @return The payload length |
| 188 | */ |
| 189 | public short getPayloadLength() { |
| 190 | return this.payloadLength; |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * Set the payload length. |
| 195 | * |
| 196 | * @param payloadLength the payload length to set. |
| 197 | * @return this |
| 198 | */ |
| 199 | public Pppoe setPayloadLength(short payloadLength) { |
| 200 | this.payloadLength = payloadLength; |
| 201 | return this; |
| 202 | } |
| 203 | |
| 204 | @Override |
| 205 | public byte[] serialize() { |
| 206 | byte[] payloadData = null; |
| 207 | int payloadLength = 0; |
| 208 | if (this.payload != null) { |
| 209 | this.payload.setParent(this); |
| 210 | payloadData = this.payload.serialize(); |
| 211 | payloadLength = payloadData.length + HEADER_LENGTH + |
| 212 | (this.packetType == PppoeType.SESSION ? 2 : 0); |
| 213 | } |
| 214 | // PayloadLength account for PPP header field |
| 215 | int realLength = Math.max(this.payloadLength + HEADER_LENGTH, payloadLength); |
| 216 | final byte[] data = new byte[realLength]; |
| 217 | final ByteBuffer bb = ByteBuffer.wrap(data); |
| 218 | bb.put((byte) (this.version << 4 | this.typeId & 0xf)); |
| 219 | bb.put(this.packetType.code); |
| 220 | bb.putShort(this.sessionId); |
| 221 | bb.putShort(this.payloadLength); |
| 222 | if (this.packetType != PppoeType.SESSION) { |
| 223 | // Only session packet have PPP header |
| 224 | bb.putShort(this.pppProtocol); |
| 225 | } else { |
| 226 | // Only NON session packet have options |
| 227 | // TLV Tags |
| 228 | if (acName != null) { |
| 229 | bb.put(acName.serialize()); |
| 230 | } |
| 231 | if (serviceName != null) { |
| 232 | bb.put(serviceName.serialize()); |
| 233 | } |
| 234 | if (this.optionalTagTlvList != null) { |
| 235 | for (final PppoeTlvTag tlv : this.optionalTagTlvList) { |
| 236 | bb.put(tlv.serialize()); |
| 237 | } |
| 238 | } |
| 239 | } |
| 240 | if (payloadData != null) { |
| 241 | bb.put(payloadData); |
| 242 | } |
| 243 | return data; |
| 244 | } |
| 245 | |
| 246 | /** |
| 247 | * Deserializer function for PPPoE packets. |
| 248 | * |
| 249 | * @return deserializer function |
| 250 | */ |
| 251 | public static Deserializer<Pppoe> deserializer() { |
| 252 | return (data, offset, length) -> { |
| 253 | checkInput(data, offset, length, HEADER_LENGTH); |
| 254 | |
| 255 | Pppoe pppoe = new Pppoe(); |
| 256 | final ByteBuffer bb = ByteBuffer.wrap(data, offset, length); |
| 257 | byte versionAndType = bb.get(); |
| 258 | pppoe.version = (byte) (versionAndType >> 4 & 0xF); |
| 259 | pppoe.typeId = (byte) (versionAndType & 0xF); |
| 260 | byte code = bb.get(); |
| 261 | pppoe.sessionId = bb.getShort(); |
| 262 | pppoe.payloadLength = bb.getShort(); |
| 263 | pppoe.packetType = PppoeType.lookup(code); |
| 264 | // Check if the PPPoE packet is a SESSION packet |
| 265 | if (pppoe.packetType == PppoeType.SESSION) { |
| 266 | // Parse inner protocols |
| 267 | pppoe.pppProtocol = bb.getShort(); |
| 268 | Deserializer<? extends IPacket> deserializer; |
| 269 | if (Pppoe.PROTOCOL_DESERIALIZER_MAP.containsKey(pppoe.pppProtocol)) { |
| 270 | deserializer = PROTOCOL_DESERIALIZER_MAP.get(pppoe.pppProtocol); |
| 271 | } else { |
| 272 | deserializer = Data.deserializer(); |
| 273 | } |
| 274 | int remainingLength = bb.limit() - bb.position(); |
| 275 | int bytesToRead = Math.min(pppoe.payloadLength - 2, remainingLength); |
| 276 | if (bytesToRead > 0) { |
| 277 | pppoe.payload = deserializer.deserialize(data, bb.position(), bytesToRead); |
| 278 | pppoe.payload.setParent(pppoe); |
| 279 | } |
| 280 | } else { |
| 281 | // PPPoE Packet is of Discovery type |
| 282 | // Parse TLV PPPoED Tags |
| 283 | int currentIndex = HEADER_LENGTH; |
| 284 | PppoeTlvTag tlv; |
| 285 | do { |
| 286 | // Each new TLV PPPoE TAG must be a minimum of 4 bytes |
| 287 | // (containing the type and length fields). |
| 288 | if (length - currentIndex < 4) { |
| 289 | // Probably the packet was zero-padded to reach the Ethernet minimum length. |
| 290 | // Let's skip and accept the packet |
| 291 | // FIXME: is there a "smarter" way to identify a padded packet? |
| 292 | break; |
| 293 | } |
| 294 | currentIndex += 4; |
| 295 | checkHeaderLength(length, currentIndex); |
| 296 | tlv = new PppoeTlvTag().deserialize(bb); |
| 297 | // if there was a failure to deserialize stop processing TLVs |
| 298 | if (tlv == null) { |
| 299 | break; |
| 300 | } |
| 301 | switch (tlv.getTagType()) { |
| 302 | case PppoeTlvTag.PPPOED_TAGTYPE_EOL: |
| 303 | // end delimiter |
| 304 | break; |
| 305 | case PppoeTlvTag.PPPOED_TAGTYPE_SERVICENAME: |
| 306 | // Service Name |
| 307 | pppoe.serviceName = tlv; |
| 308 | break; |
| 309 | case PppoeTlvTag.PPPOED_TAGTYPE_ACNAME: |
| 310 | // AC-Name |
| 311 | pppoe.acName = tlv; |
| 312 | break; |
| 313 | default: |
| 314 | pppoe.optionalTagTlvList.add(tlv); |
| 315 | break; |
| 316 | } |
| 317 | currentIndex += tlv.getLength(); |
| 318 | } while (tlv.getTagType() != 0 && currentIndex < length); |
| 319 | } |
| 320 | return pppoe; |
| 321 | }; |
| 322 | } |
| 323 | |
| 324 | @Override |
| 325 | public String toString() { |
| 326 | return toStringHelper(getClass()) |
| 327 | .add("version", Byte.toString(version)) |
| 328 | .add("typeId", Byte.toString(typeId)) |
| 329 | .add("code", Byte.toString(packetType.code)) |
| 330 | .add("sessionId", Short.toString(sessionId)) |
| 331 | .add("payloadLength", Short.toString(payloadLength)) |
| 332 | .toString(); |
| 333 | } |
| 334 | |
| 335 | @Override |
| 336 | public int hashCode() { |
| 337 | return 31 * super.hashCode() + |
| 338 | Objects.hashCode(version, typeId, packetType, |
| 339 | sessionId, payloadLength, pppProtocol, |
| 340 | acName, serviceName, optionalTagTlvList); |
| 341 | } |
| 342 | |
| 343 | @Override |
| 344 | public boolean equals(Object obj) { |
| 345 | if (this == obj) { |
| 346 | return true; |
| 347 | } |
| 348 | if (obj == null || getClass() != obj.getClass()) { |
| 349 | return false; |
| 350 | } |
| 351 | if (!super.equals(obj)) { |
| 352 | return false; |
| 353 | } |
| 354 | final Pppoe other = (Pppoe) obj; |
| 355 | return Objects.equal(this.version, other.version) |
| 356 | && Objects.equal(this.typeId, other.typeId) |
| 357 | && Objects.equal(this.packetType, other.packetType) |
| 358 | && Objects.equal(this.sessionId, other.sessionId) |
| 359 | && Objects.equal(this.payloadLength, other.payloadLength) |
| 360 | && Objects.equal(this.pppProtocol, other.pppProtocol) |
| 361 | && Objects.equal(this.acName, other.acName) |
| 362 | && Objects.equal(this.serviceName, other.serviceName) |
| 363 | && Objects.equal(this.optionalTagTlvList, other.optionalTagTlvList); |
| 364 | } |
| 365 | |
| 366 | /** |
| 367 | * PPPoE Discovery types. |
| 368 | */ |
| 369 | public enum PppoeType { |
| 370 | PADI(0x9, "padi"), |
| 371 | PADO(0x7, "pado"), |
| 372 | PADR(0x19, "padr"), |
| 373 | PADS(0x65, "pads"), |
| 374 | PADT(0xa7, "padt"), |
| 375 | SESSION(0x0, "session"), |
| 376 | UNKNOWN(0xFF, "unknown"); |
| 377 | |
| 378 | private final byte code; |
| 379 | private final String type; |
| 380 | |
| 381 | /** |
| 382 | * Constructs new PPPoE Discovery types. |
| 383 | * |
| 384 | * @param code The PPPoED type. |
| 385 | * @param type Textual representation of the PPPoED type. |
| 386 | */ |
| 387 | PppoeType(int code, String type) { |
| 388 | this.code = (byte) (code & 0xFF); |
| 389 | this.type = type; |
| 390 | } |
| 391 | |
| 392 | public static PppoeType lookup(byte code) { |
| 393 | for (PppoeType type : PppoeType.values()) { |
| 394 | if (code == type.code()) { |
| 395 | return type; |
| 396 | } |
| 397 | } |
| 398 | return UNKNOWN; |
| 399 | } |
| 400 | |
| 401 | public byte code() { |
| 402 | return code; |
| 403 | } |
| 404 | |
| 405 | public String type() { |
| 406 | return type; |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | /** |
| 411 | * Checks if the passed Ethernet packet is PPPoE Service. |
| 412 | * |
| 413 | * @param eth Packet to check |
| 414 | * @return True if the packet contains PPPoE Service header |
| 415 | */ |
| 416 | public static boolean isPPPoES(Ethernet eth) { |
| 417 | return eth.getEtherType() == TYPE_PPPOES; |
| 418 | } |
| 419 | |
| 420 | /** |
| 421 | * Checks if the passed Ethernet packet is PPPoE Discovery. |
| 422 | * |
| 423 | * @param eth Packet to check |
| 424 | * @return True if the packet contains PPPoE Discovery header |
| 425 | */ |
| 426 | public static boolean isPPPoED(Ethernet eth) { |
| 427 | return eth.getEtherType() == TYPE_PPPOED; |
| 428 | } |
| 429 | } |