| /* |
| * Copyright 2019-2024 Open Networking Foundation (ONF) and the ONF Contributors |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.opencord.bng.packets; |
| |
| import com.google.common.base.Objects; |
| import com.google.common.collect.Lists; |
| import org.onlab.packet.DeserializationException; |
| import org.onlab.packet.Deserializer; |
| import org.onlab.packet.IpAddress; |
| |
| import java.nio.ByteBuffer; |
| import java.util.List; |
| |
| import static com.google.common.base.MoreObjects.toStringHelper; |
| import static org.onlab.packet.PacketUtils.checkHeaderLength; |
| import static org.onlab.packet.PacketUtils.checkInput; |
| |
| /** |
| * Implements the IP Control Protocol (IPCP) packet format. |
| */ |
| |
| public class Ipcp extends Ppp { |
| |
| public static final byte CONF_REQ = 0x01; |
| public static final byte ACK = 0x02; |
| public static final byte NAK = 0x03; |
| |
| private PppTlv ipaddresstlv = null; |
| |
| private List<PppTlv> pppTlvList; |
| |
| Ipcp() { |
| super(); |
| pppTlvList = Lists.newLinkedList(); |
| } |
| |
| /** |
| * Gets the IP Address TLV field. |
| * |
| * @return the IP Address TLV field if present, null otherwise |
| */ |
| public PppTlv getIpAddressTlv() { |
| return this.ipaddresstlv; |
| } |
| |
| /** |
| * Gets the IP address TLV field as an IpAddress object. |
| * |
| * @return The IP address TLV field as IpAddress object, it will be address |
| * 0 if no TLV address is present in the packet |
| */ |
| public IpAddress getIpAddress() { |
| return IpAddress.valueOf(IpAddress.Version.INET, |
| this.getIpAddressTlv().getValue()); |
| } |
| |
| /** |
| * Sets the IP address TLV field. |
| * |
| * @param ipaddresstlv the IP address TLV to set |
| * @return this |
| */ |
| public Ipcp setIpAddressTlv(PppTlv ipaddresstlv) { |
| this.ipaddresstlv = ipaddresstlv; |
| return this; |
| } |
| |
| /** |
| * Gets the TLV field list. |
| * |
| * @return the IPCP TLV field list |
| */ |
| public List<PppTlv> getIpcpTlvList() { |
| return this.pppTlvList; |
| } |
| |
| @Override |
| public byte[] serialize() { |
| // TODO: Can it have any payload? |
| final byte[] data = new byte[this.length]; |
| final ByteBuffer bb = ByteBuffer.wrap(data); |
| bb.put(this.code); |
| bb.put(this.identifier); |
| bb.putShort(this.length); |
| if (ipaddresstlv != null) { |
| bb.put(ipaddresstlv.serialize()); |
| } |
| if (this.pppTlvList != null) { |
| for (final PppTlv tlv : this.pppTlvList) { |
| bb.put(tlv.serialize()); |
| } |
| } |
| return data; |
| } |
| |
| /** |
| * Deserializer function for IPCP packets. |
| * |
| * @return deserializer function |
| */ |
| public static Deserializer<Ipcp> deserializer() { |
| return (data, offset, length) -> { |
| checkInput(data, offset, length, MIN_HEADER_LENGTH); |
| Ipcp ipcp = new Ipcp(); |
| ByteBuffer bb = ByteBuffer.wrap(data, offset, length); |
| ipcp.code = bb.get(); |
| ipcp.identifier = bb.get(); |
| ipcp.length = bb.getShort(); |
| short currentIndex = MIN_HEADER_LENGTH; |
| PppTlv tlv; |
| while (currentIndex < ipcp.length) { |
| // Each new TLV IPCP must be a minimum of 2 bytes |
| // (containing the type and length fields). |
| currentIndex += 2; |
| checkHeaderLength(length, currentIndex); |
| |
| tlv = (new PppTlv()).deserialize(bb); |
| // if there was a failure to deserialize stop processing TLVs |
| if (tlv == null) { |
| break; |
| } |
| if (tlv.getType() == PppTlv.IPCPTLV_IP_ADDRESS) { |
| ipcp.ipaddresstlv = tlv; |
| } else { |
| ipcp.pppTlvList.add(tlv); |
| } |
| currentIndex += tlv.getLength() - 2; |
| } |
| if (currentIndex != ipcp.length) { |
| throw new DeserializationException("Length of packet do not correspond to IPCP TLVs options"); |
| } |
| return ipcp; |
| }; |
| } |
| |
| @Override |
| public int hashCode() { |
| return 31 * super.hashCode() + Objects.hashCode(ipaddresstlv); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null || getClass() != obj.getClass()) { |
| return false; |
| } |
| if (!super.equals(obj)) { |
| return false; |
| } |
| final Ipcp other = (Ipcp) obj; |
| return Objects.equal(this.ipaddresstlv, other.ipaddresstlv); |
| } |
| |
| @Override |
| public String toString() { |
| return toStringHelper(this) |
| .add("code", code) |
| .add("identifier", identifier) |
| .add("length", length) |
| .add("pppTlvList", pppTlvList) |
| .add("ipaddresstlv", ipaddresstlv) |
| .toString(); |
| } |
| } |