| package org.onlab.packet; |
| |
| import java.nio.ByteBuffer; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| public class MPLS extends BasePacket { |
| public static final int ADDRESS_LENGTH = 4; |
| public static final byte PROTOCOL_IPV4 = 0x1; |
| public static final byte PROTOCOL_MPLS = 0x6; |
| public static final Map<Byte, Class<? extends IPacket>> PROTOCOL_CLASS_MAP; |
| |
| static { |
| PROTOCOL_CLASS_MAP = new HashMap<Byte, Class<? extends IPacket>>(); |
| PROTOCOL_CLASS_MAP.put(PROTOCOL_IPV4, IPv4.class); |
| PROTOCOL_CLASS_MAP.put(PROTOCOL_MPLS, MPLS.class); |
| } |
| |
| protected int label; //20bits |
| protected byte bos; //1bit |
| protected byte ttl; //8bits |
| protected byte protocol; |
| |
| /** |
| * Default constructor that sets the version to 4. |
| */ |
| public MPLS() { |
| super(); |
| this.bos = 1; |
| this.protocol = PROTOCOL_IPV4; |
| } |
| |
| @Override |
| public byte[] serialize() { |
| byte[] payloadData = null; |
| if (payload != null) { |
| payload.setParent(this); |
| payloadData = payload.serialize(); |
| } |
| |
| byte[] data = new byte[(4 + ((payloadData != null) ? payloadData.length : 0)) ]; |
| ByteBuffer bb = ByteBuffer.wrap(data); |
| |
| bb.putInt(((this.label & 0x000fffff) << 12) | ((this.bos & 0x1) << 8 | (this.ttl & 0xff))); |
| if (payloadData != null) { |
| bb.put(payloadData); |
| } |
| |
| return data; |
| } |
| |
| @Override |
| public IPacket deserialize(byte[] data, int offset, int length) { |
| ByteBuffer bb = ByteBuffer.wrap(data, offset, length); |
| |
| int mplsheader = bb.getInt(); |
| this.label = ((mplsheader & 0xfffff000) >> 12); |
| this.bos = (byte) ((mplsheader & 0x00000100) >> 8); |
| this.bos = (byte) (mplsheader & 0x000000ff); |
| this.protocol = (this.bos == 1) ? PROTOCOL_IPV4 : PROTOCOL_MPLS; |
| |
| IPacket payload; |
| if (IPv4.PROTOCOL_CLASS_MAP.containsKey(this.protocol)) { |
| Class<? extends IPacket> clazz = IPv4.PROTOCOL_CLASS_MAP.get(this.protocol); |
| try { |
| payload = clazz.newInstance(); |
| } catch (Exception e) { |
| throw new RuntimeException("Error parsing payload for MPLS packet", e); |
| } |
| } else { |
| payload = new Data(); |
| } |
| this.payload = payload.deserialize(data, bb.position(), bb.limit() - bb.position()); |
| this.payload.setParent(this); |
| |
| return this; |
| } |
| |
| /** |
| * Returns the MPLS label. |
| * |
| * @return MPLS label |
| */ |
| public int getLabel() { |
| return label; |
| } |
| |
| /** |
| * Sets the MPLS label. |
| * |
| * @param label MPLS label |
| */ |
| public void setLabel(int label) { |
| this.label = label; |
| } |
| |
| /** |
| * Returns the MPLS TTL of the packet. |
| * |
| * @return MPLS TTL of the packet |
| */ |
| public byte getTtl() { |
| return ttl; |
| } |
| |
| /** |
| * Sets the MPLS TTL of the packet. |
| * |
| * @param ttl MPLS TTL |
| */ |
| public void setTtl(byte ttl) { |
| this.ttl = ttl; |
| } |
| |
| } |