sangho | b35a619 | 2015-04-01 13:05:26 -0700 | [diff] [blame] | 1 | package org.onlab.packet; |
| 2 | |
| 3 | import java.nio.ByteBuffer; |
| 4 | import java.util.HashMap; |
| 5 | import java.util.Map; |
| 6 | |
| 7 | public class MPLS extends BasePacket { |
| 8 | public static final int ADDRESS_LENGTH = 4; |
| 9 | public static final byte PROTOCOL_IPV4 = 0x1; |
| 10 | public static final byte PROTOCOL_MPLS = 0x6; |
| 11 | public static final Map<Byte, Class<? extends IPacket>> PROTOCOL_CLASS_MAP; |
| 12 | |
| 13 | static { |
| 14 | PROTOCOL_CLASS_MAP = new HashMap<Byte, Class<? extends IPacket>>(); |
| 15 | PROTOCOL_CLASS_MAP.put(PROTOCOL_IPV4, IPv4.class); |
| 16 | PROTOCOL_CLASS_MAP.put(PROTOCOL_MPLS, MPLS.class); |
| 17 | } |
| 18 | |
| 19 | protected int label; //20bits |
| 20 | protected byte bos; //1bit |
| 21 | protected byte ttl; //8bits |
| 22 | protected byte protocol; |
| 23 | |
| 24 | /** |
| 25 | * Default constructor that sets the version to 4. |
| 26 | */ |
| 27 | public MPLS() { |
| 28 | super(); |
| 29 | this.bos = 1; |
| 30 | this.protocol = PROTOCOL_IPV4; |
| 31 | } |
| 32 | |
| 33 | @Override |
| 34 | public byte[] serialize() { |
| 35 | byte[] payloadData = null; |
| 36 | if (payload != null) { |
| 37 | payload.setParent(this); |
| 38 | payloadData = payload.serialize(); |
| 39 | } |
| 40 | |
| 41 | byte[] data = new byte[(4 + ((payloadData != null) ? payloadData.length : 0)) ]; |
| 42 | ByteBuffer bb = ByteBuffer.wrap(data); |
| 43 | |
| 44 | bb.putInt(((this.label & 0x000fffff) << 12) | ((this.bos & 0x1) << 8 | (this.ttl & 0xff))); |
| 45 | if (payloadData != null) { |
| 46 | bb.put(payloadData); |
| 47 | } |
| 48 | |
| 49 | return data; |
| 50 | } |
| 51 | |
| 52 | @Override |
| 53 | public IPacket deserialize(byte[] data, int offset, int length) { |
| 54 | ByteBuffer bb = ByteBuffer.wrap(data, offset, length); |
| 55 | |
| 56 | int mplsheader = bb.getInt(); |
| 57 | this.label = ((mplsheader & 0xfffff000) >> 12); |
| 58 | this.bos = (byte) ((mplsheader & 0x00000100) >> 8); |
| 59 | this.bos = (byte) (mplsheader & 0x000000ff); |
| 60 | this.protocol = (this.bos == 1) ? PROTOCOL_IPV4 : PROTOCOL_MPLS; |
| 61 | |
| 62 | IPacket payload; |
| 63 | if (IPv4.PROTOCOL_CLASS_MAP.containsKey(this.protocol)) { |
| 64 | Class<? extends IPacket> clazz = IPv4.PROTOCOL_CLASS_MAP.get(this.protocol); |
| 65 | try { |
| 66 | payload = clazz.newInstance(); |
| 67 | } catch (Exception e) { |
| 68 | throw new RuntimeException("Error parsing payload for MPLS packet", e); |
| 69 | } |
| 70 | } else { |
| 71 | payload = new Data(); |
| 72 | } |
| 73 | this.payload = payload.deserialize(data, bb.position(), bb.limit() - bb.position()); |
| 74 | this.payload.setParent(this); |
| 75 | |
| 76 | return this; |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Returns the MPLS label. |
| 81 | * |
| 82 | * @return MPLS label |
| 83 | */ |
| 84 | public int getLabel() { |
| 85 | return label; |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * Sets the MPLS label. |
| 90 | * |
Thomas Vachuska | e10f56b | 2015-04-15 18:20:08 -0700 | [diff] [blame] | 91 | * @param label MPLS label |
sangho | b35a619 | 2015-04-01 13:05:26 -0700 | [diff] [blame] | 92 | */ |
| 93 | public void setLabel(int label) { |
| 94 | this.label = label; |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Returns the MPLS TTL of the packet. |
| 99 | * |
| 100 | * @return MPLS TTL of the packet |
| 101 | */ |
| 102 | public byte getTtl() { |
| 103 | return ttl; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Sets the MPLS TTL of the packet. |
| 108 | * |
| 109 | * @param ttl MPLS TTL |
| 110 | */ |
| 111 | public void setTtl(byte ttl) { |
| 112 | this.ttl = ttl; |
| 113 | } |
| 114 | |
| 115 | } |