| /* |
| * Copyright 2015-present Open Networking Foundation |
| * |
| * 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.onlab.packet.ipv6; |
| |
| import org.onlab.packet.BasePacket; |
| import org.onlab.packet.Data; |
| import org.onlab.packet.DeserializationException; |
| import org.onlab.packet.Deserializer; |
| import org.onlab.packet.IPacket; |
| import org.onlab.packet.IPv6; |
| |
| import java.nio.ByteBuffer; |
| |
| import static com.google.common.base.MoreObjects.toStringHelper; |
| import static org.onlab.packet.PacketUtils.checkInput; |
| |
| /** |
| * Implements IPv6 fragment extension header format. (RFC 2460) |
| */ |
| public class Fragment extends BasePacket implements IExtensionHeader { |
| public static final byte HEADER_LENGTH = 8; // bytes |
| |
| protected byte nextHeader; |
| protected short fragmentOffset; |
| protected byte moreFragment; |
| protected int identification; |
| |
| @Override |
| public byte getNextHeader() { |
| return this.nextHeader; |
| } |
| |
| @Override |
| public Fragment setNextHeader(final byte nextHeader) { |
| this.nextHeader = nextHeader; |
| return this; |
| } |
| |
| /** |
| * Gets the fragment offset of this header. |
| * |
| * @return fragment offset |
| */ |
| public short getFragmentOffset() { |
| return this.fragmentOffset; |
| } |
| |
| /** |
| * Sets the fragment offset of this header. |
| * |
| * @param fragmentOffset the fragment offset to set |
| * @return this |
| */ |
| public Fragment setFragmentOffset(final short fragmentOffset) { |
| this.fragmentOffset = fragmentOffset; |
| return this; |
| } |
| |
| /** |
| * Gets the more fragment flag of this header. |
| * |
| * @return more fragment flag |
| */ |
| public byte getMoreFragment() { |
| return this.moreFragment; |
| } |
| |
| /** |
| * Sets the more fragment flag of this header. |
| * |
| * @param moreFragment the more fragment flag to set |
| * @return this |
| */ |
| public Fragment setMoreFragment(final byte moreFragment) { |
| this.moreFragment = moreFragment; |
| return this; |
| } |
| |
| /** |
| * Gets the identification of this header. |
| * |
| * @return identification |
| */ |
| public int getIdentification() { |
| return this.identification; |
| } |
| |
| /** |
| * Sets the identification of this header. |
| * |
| * @param identification the identification to set |
| * @return this |
| */ |
| public Fragment setIdentification(final int identification) { |
| this.identification = identification; |
| return this; |
| } |
| |
| @Override |
| public byte[] serialize() { |
| byte[] payloadData = null; |
| if (this.payload != null) { |
| this.payload.setParent(this); |
| payloadData = this.payload.serialize(); |
| } |
| |
| int payloadLength = 0; |
| if (payloadData != null) { |
| payloadLength = payloadData.length; |
| } |
| |
| final byte[] data = new byte[HEADER_LENGTH + payloadLength]; |
| final ByteBuffer bb = ByteBuffer.wrap(data); |
| |
| bb.put(this.nextHeader); |
| bb.put((byte) 0); |
| bb.putShort((short) ( |
| (this.fragmentOffset & 0x1fff) << 3 | |
| this.moreFragment & 0x1 |
| )); |
| bb.putInt(this.identification); |
| |
| if (payloadData != null) { |
| bb.put(payloadData); |
| } |
| |
| if (this.parent != null && this.parent instanceof IExtensionHeader) { |
| ((IExtensionHeader) this.parent).setNextHeader(IPv6.PROTOCOL_FRAG); |
| } |
| return data; |
| } |
| |
| @Override |
| public IPacket deserialize(byte[] data, int offset, int length) { |
| final ByteBuffer bb = ByteBuffer.wrap(data, offset, length); |
| this.nextHeader = bb.get(); |
| bb.get(); |
| short sscratch = bb.getShort(); |
| this.fragmentOffset = (short) (sscratch >> 3 & 0x1fff); |
| this.moreFragment = (byte) (sscratch & 0x1); |
| this.identification = bb.getInt(); |
| |
| Deserializer<? extends IPacket> deserializer; |
| if (IPv6.PROTOCOL_DESERIALIZER_MAP.containsKey(this.nextHeader)) { |
| deserializer = IPv6.PROTOCOL_DESERIALIZER_MAP.get(this.nextHeader); |
| } else { |
| deserializer = Data.deserializer(); |
| } |
| try { |
| this.payload = deserializer.deserialize(data, bb.position(), |
| bb.limit() - bb.position()); |
| this.payload.setParent(this); |
| } catch (DeserializationException e) { |
| return this; |
| } |
| |
| return this; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see java.lang.Object#hashCode() |
| */ |
| @Override |
| public int hashCode() { |
| final int prime = 5807; |
| int result = super.hashCode(); |
| result = prime * result + this.nextHeader; |
| result = prime * result + this.fragmentOffset; |
| result = prime * result + this.moreFragment; |
| result = prime * result + this.identification; |
| return result; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see java.lang.Object#equals(java.lang.Object) |
| */ |
| @Override |
| public boolean equals(final Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (!super.equals(obj)) { |
| return false; |
| } |
| if (!(obj instanceof Fragment)) { |
| return false; |
| } |
| final Fragment other = (Fragment) obj; |
| if (this.nextHeader != other.nextHeader) { |
| return false; |
| } |
| if (this.fragmentOffset != other.fragmentOffset) { |
| return false; |
| } |
| if (this.moreFragment != other.moreFragment) { |
| return false; |
| } |
| if (this.identification != other.identification) { |
| return false; |
| } |
| return true; |
| } |
| |
| /** |
| * Deserializer function for fragment headers. |
| * |
| * @return deserializer function |
| */ |
| public static Deserializer<Fragment> deserializer() { |
| return (data, offset, length) -> { |
| checkInput(data, offset, length, HEADER_LENGTH); |
| |
| Fragment fragment = new Fragment(); |
| |
| ByteBuffer bb = ByteBuffer.wrap(data, offset, length); |
| fragment.nextHeader = bb.get(); |
| bb.get(); |
| short sscratch = bb.getShort(); |
| fragment.fragmentOffset = (short) (sscratch >> 3 & 0x1fff); |
| fragment.moreFragment = (byte) (sscratch & 0x1); |
| fragment.identification = bb.getInt(); |
| |
| Deserializer<? extends IPacket> deserializer; |
| if (IPv6.PROTOCOL_DESERIALIZER_MAP.containsKey(fragment.nextHeader)) { |
| deserializer = IPv6.PROTOCOL_DESERIALIZER_MAP.get(fragment.nextHeader); |
| } else { |
| deserializer = Data.deserializer(); |
| } |
| fragment.payload = deserializer.deserialize(data, bb.position(), |
| bb.limit() - bb.position()); |
| fragment.payload.setParent(fragment); |
| |
| return fragment; |
| }; |
| } |
| |
| @Override |
| public String toString() { |
| return toStringHelper(getClass()) |
| .add("nextHeader", Byte.toString(nextHeader)) |
| .add("fragmentOffset", Short.toString(fragmentOffset)) |
| .add("moreFragment", Byte.toString(moreFragment)) |
| .add("identification", Integer.toString(identification)) |
| .toString(); |
| } |
| } |