Charles Chan | 64c2dfd | 2018-07-24 11:58:08 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2018-present Open Networking Foundation |
| 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.onlab.packet.lacp; |
| 18 | |
| 19 | import com.google.common.collect.ImmutableMap; |
| 20 | import org.onlab.packet.BasePacket; |
| 21 | import org.onlab.packet.DeserializationException; |
| 22 | import org.onlab.packet.Deserializer; |
| 23 | |
| 24 | import java.nio.ByteBuffer; |
| 25 | import java.util.Map; |
| 26 | import java.util.Objects; |
| 27 | import java.util.Optional; |
| 28 | import java.util.concurrent.ConcurrentHashMap; |
| 29 | |
| 30 | import static com.google.common.base.MoreObjects.toStringHelper; |
| 31 | import static org.onlab.packet.PacketUtils.checkInput; |
| 32 | |
| 33 | public class Lacp extends BasePacket { |
| 34 | public static final int HEADER_LENGTH = 1; |
| 35 | public static final byte TYPE_ACTOR = 1; |
| 36 | public static final byte TYPE_PARTNER = 2; |
| 37 | public static final byte TYPE_COLLECTOR = 3; |
| 38 | public static final byte TYPE_TERMINATOR = 0; |
| 39 | |
| 40 | private static final Map<Byte, Deserializer<? extends LacpTlv>> PROTOCOL_DESERIALIZER_MAP = |
| 41 | ImmutableMap.<Byte, Deserializer<? extends LacpTlv>>builder() |
| 42 | .put(TYPE_ACTOR, LacpBaseTlv.deserializer()) |
| 43 | .put(TYPE_PARTNER, LacpBaseTlv.deserializer()) |
| 44 | .put(TYPE_COLLECTOR, LacpCollectorTlv.deserializer()) |
| 45 | .put(TYPE_TERMINATOR, LacpTerminatorTlv.deserializer()) |
| 46 | .build(); |
| 47 | |
| 48 | private byte lacpVersion; |
| 49 | private Map<Byte, LacpTlv> tlv = new ConcurrentHashMap<>(); |
| 50 | |
| 51 | /** |
| 52 | * Gets LACP version. |
| 53 | * |
| 54 | * @return LACP version |
| 55 | */ |
| 56 | public byte getLacpVersion() { |
| 57 | return this.lacpVersion; |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * Sets LACP version. |
| 62 | * |
| 63 | * @param lacpVersion LACP version |
| 64 | * @return this |
| 65 | */ |
| 66 | public Lacp setLacpVersion(byte lacpVersion) { |
| 67 | this.lacpVersion = lacpVersion; |
| 68 | return this; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Gets LACP TLV. |
| 73 | * |
| 74 | * @return LACP TLV |
| 75 | */ |
| 76 | public Map<Byte, LacpTlv> getTlv() { |
| 77 | return this.tlv; |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Sets LACP TLV. |
| 82 | * |
| 83 | * @param tlv LACP TLV |
| 84 | * @return this |
| 85 | */ |
| 86 | public Lacp setTlv(Map<Byte, LacpTlv> tlv) { |
| 87 | this.tlv = tlv; |
| 88 | return this; |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * Deserializer function for LACP packets. |
| 93 | * |
| 94 | * @return deserializer function |
| 95 | */ |
| 96 | public static Deserializer<Lacp> deserializer() { |
| 97 | return (data, offset, length) -> { |
| 98 | checkInput(data, offset, length, HEADER_LENGTH); |
| 99 | |
| 100 | Lacp lacp = new Lacp(); |
| 101 | ByteBuffer bb = ByteBuffer.wrap(data, offset, length); |
| 102 | lacp.setLacpVersion(bb.get()); |
| 103 | |
| 104 | while (bb.limit() - bb.position() > 0) { |
| 105 | byte nextType = bb.get(); |
| 106 | int nextLength = Byte.toUnsignedInt(bb.get()); |
| 107 | int parseLength = nextLength == 0 ? |
| 108 | LacpTerminatorTlv.PADDING_LENGTH : // Special case for LacpTerminatorTlv |
| 109 | nextLength - 2; |
| 110 | |
| 111 | Deserializer<? extends LacpTlv> deserializer; |
| 112 | if (Lacp.PROTOCOL_DESERIALIZER_MAP.containsKey(nextType)) { |
| 113 | deserializer = Lacp.PROTOCOL_DESERIALIZER_MAP.get(nextType); |
| 114 | } else { |
| 115 | throw new DeserializationException("Unsupported LACP subtype " + Byte.toString(nextType)); |
| 116 | } |
| 117 | |
| 118 | LacpTlv tlv = deserializer.deserialize(data, bb.position(), parseLength); |
| 119 | LacpTlv previousTlv = lacp.tlv.put(nextType, tlv); |
| 120 | if (previousTlv != null) { |
| 121 | throw new DeserializationException("Duplicated type " + Byte.toString(nextType) |
| 122 | + "in LACP TLV"); |
| 123 | } |
| 124 | |
| 125 | bb.position(bb.position() + parseLength); |
| 126 | } |
| 127 | |
| 128 | return lacp; |
| 129 | }; |
| 130 | } |
| 131 | |
| 132 | @Override |
| 133 | public byte[] serialize() { |
| 134 | byte[] actorInfo = Optional.ofNullable(tlv.get(TYPE_ACTOR)).map(LacpTlv::serialize) |
| 135 | .orElse(new byte[0]); |
| 136 | byte[] partnerInfo = Optional.ofNullable(tlv.get(TYPE_PARTNER)).map(LacpTlv::serialize) |
| 137 | .orElse(new byte[0]); |
| 138 | byte[] collectorInfo = Optional.ofNullable(tlv.get(TYPE_COLLECTOR)).map(LacpTlv::serialize) |
| 139 | .orElse(new byte[0]); |
| 140 | byte[] terminatorInfo = Optional.ofNullable(tlv.get(TYPE_TERMINATOR)).map(LacpTlv::serialize) |
| 141 | .orElse(new byte[0]); |
| 142 | |
| 143 | final byte[] data = new byte[HEADER_LENGTH |
| 144 | + LacpTlv.HEADER_LENGTH + actorInfo.length |
| 145 | + LacpTlv.HEADER_LENGTH + partnerInfo.length |
| 146 | + LacpTlv.HEADER_LENGTH + collectorInfo.length |
| 147 | + LacpTlv.HEADER_LENGTH + terminatorInfo.length]; |
| 148 | |
| 149 | final ByteBuffer bb = ByteBuffer.wrap(data); |
| 150 | bb.put(lacpVersion); |
| 151 | bb.put(TYPE_ACTOR); |
| 152 | bb.put(LacpBaseTlv.LENGTH); |
| 153 | bb.put(actorInfo); |
| 154 | bb.put(TYPE_PARTNER); |
| 155 | bb.put(LacpBaseTlv.LENGTH); |
| 156 | bb.put(partnerInfo); |
| 157 | bb.put(TYPE_COLLECTOR); |
| 158 | bb.put(LacpCollectorTlv.LENGTH); |
| 159 | bb.put(collectorInfo); |
| 160 | bb.put(TYPE_TERMINATOR); |
| 161 | bb.put(LacpTerminatorTlv.LENGTH); |
| 162 | bb.put(terminatorInfo); |
| 163 | |
| 164 | return data; |
| 165 | } |
| 166 | |
| 167 | @Override |
| 168 | public int hashCode() { |
| 169 | return Objects.hash(super.hashCode(), lacpVersion, tlv); |
| 170 | } |
| 171 | |
| 172 | @Override |
| 173 | public boolean equals(final Object obj) { |
| 174 | if (this == obj) { |
| 175 | return true; |
| 176 | } |
| 177 | if (!super.equals(obj)) { |
| 178 | return false; |
| 179 | } |
| 180 | if (!(obj instanceof Lacp)) { |
| 181 | return false; |
| 182 | } |
| 183 | final Lacp other = (Lacp) obj; |
| 184 | |
| 185 | return this.lacpVersion == other.lacpVersion && |
| 186 | Objects.equals(this.tlv, other.tlv); |
| 187 | } |
| 188 | |
| 189 | @Override |
| 190 | public String toString() { |
| 191 | return toStringHelper(getClass()) |
| 192 | .add("lacpVersion", Byte.toString(lacpVersion)) |
| 193 | .add("tlv", tlv) |
| 194 | .toString(); |
| 195 | } |
| 196 | } |