Priyanka B | b2988fa | 2015-10-09 12:45:36 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 Open Networking Laboratory |
| 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 | |
Jonathan Hart | 317f476 | 2015-11-09 16:05:36 -0800 | [diff] [blame^] | 17 | package org.onosproject.bgpio.protocol.linkstate; |
Priyanka B | b2988fa | 2015-10-09 12:45:36 +0530 | [diff] [blame] | 18 | |
| 19 | import java.util.Iterator; |
| 20 | import java.util.LinkedList; |
| 21 | import java.util.Objects; |
| 22 | |
| 23 | import org.jboss.netty.buffer.ChannelBuffer; |
| 24 | import org.onosproject.bgpio.exceptions.BGPParseException; |
| 25 | import org.onosproject.bgpio.types.BGPErrorType; |
| 26 | import org.onosproject.bgpio.types.BGPValueType; |
| 27 | import org.onosproject.bgpio.types.IPReachabilityInformationTlv; |
| 28 | import org.onosproject.bgpio.types.OSPFRouteTypeTlv; |
| 29 | import org.onosproject.bgpio.types.attr.BgpAttrNodeMultiTopologyId; |
| 30 | import org.onosproject.bgpio.util.UnSupportedAttribute; |
| 31 | import org.slf4j.Logger; |
| 32 | import org.slf4j.LoggerFactory; |
| 33 | |
| 34 | import com.google.common.base.MoreObjects; |
| 35 | |
| 36 | /** |
| 37 | * Provides Implementation of Local node descriptors and prefix descriptors. |
| 38 | */ |
| 39 | public class BGPPrefixLSIdentifier { |
| 40 | |
| 41 | protected static final Logger log = LoggerFactory.getLogger(BGPPrefixLSIdentifier.class); |
| 42 | public static final int TYPE_AND_LEN = 4; |
| 43 | private NodeDescriptors localNodeDescriptors; |
| 44 | private LinkedList<BGPValueType> prefixDescriptor; |
| 45 | |
| 46 | /** |
| 47 | * Resets parameters. |
| 48 | */ |
| 49 | public BGPPrefixLSIdentifier() { |
| 50 | this.localNodeDescriptors = null; |
| 51 | this.prefixDescriptor = null; |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Constructor to initialize parameters. |
| 56 | * |
| 57 | * @param localNodeDescriptors Local node descriptors |
| 58 | * @param prefixDescriptor Prefix Descriptors |
| 59 | */ |
| 60 | public BGPPrefixLSIdentifier(NodeDescriptors localNodeDescriptors, LinkedList<BGPValueType> prefixDescriptor) { |
| 61 | this.localNodeDescriptors = localNodeDescriptors; |
| 62 | this.prefixDescriptor = prefixDescriptor; |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Reads the channel buffer and parses Prefix Identifier. |
| 67 | * |
| 68 | * @param cb ChannelBuffer |
| 69 | * @param protocolId protocol ID |
| 70 | * @return object of this class |
| 71 | * @throws BGPParseException while parsing Prefix Identifier |
| 72 | */ |
| 73 | public static BGPPrefixLSIdentifier parsePrefixIdendifier(ChannelBuffer cb, byte protocolId) |
| 74 | throws BGPParseException { |
| 75 | //Parse Local Node descriptor |
| 76 | NodeDescriptors localNodeDescriptors = new NodeDescriptors(); |
| 77 | localNodeDescriptors = parseLocalNodeDescriptors(cb, protocolId); |
| 78 | |
| 79 | //Parse Prefix descriptor |
| 80 | LinkedList<BGPValueType> prefixDescriptor = new LinkedList<>(); |
| 81 | prefixDescriptor = parsePrefixDescriptors(cb); |
| 82 | return new BGPPrefixLSIdentifier(localNodeDescriptors, prefixDescriptor); |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Parse local node descriptors. |
| 87 | * |
| 88 | * @param cb ChannelBuffer |
| 89 | * @param protocolId protocol identifier |
| 90 | * @return LocalNodeDescriptors |
| 91 | * @throws BGPParseException while parsing local node descriptors |
| 92 | */ |
| 93 | public static NodeDescriptors parseLocalNodeDescriptors(ChannelBuffer cb, byte protocolId) |
| 94 | throws BGPParseException { |
| 95 | ChannelBuffer tempBuf = cb; |
| 96 | short type = cb.readShort(); |
| 97 | short length = cb.readShort(); |
| 98 | if (cb.readableBytes() < length) { |
| 99 | //length + 4 implies data contains type, length and value |
| 100 | throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.OPTIONAL_ATTRIBUTE_ERROR, |
| 101 | tempBuf.readBytes(cb.readableBytes() + TYPE_AND_LEN)); |
| 102 | } |
| 103 | NodeDescriptors localNodeDescriptors = new NodeDescriptors(); |
| 104 | ChannelBuffer tempCb = cb.readBytes(length); |
| 105 | |
| 106 | if (type == NodeDescriptors.LOCAL_NODE_DES_TYPE) { |
| 107 | localNodeDescriptors = NodeDescriptors.read(tempCb, length, type, protocolId); |
| 108 | } else { |
| 109 | throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, |
| 110 | BGPErrorType.MALFORMED_ATTRIBUTE_LIST, null); |
| 111 | } |
| 112 | return localNodeDescriptors; |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Parse list of prefix descriptors. |
| 117 | * |
| 118 | * @param cb ChannelBuffer |
| 119 | * @return list of prefix descriptors |
| 120 | * @throws BGPParseException while parsing list of prefix descriptors |
| 121 | */ |
| 122 | public static LinkedList<BGPValueType> parsePrefixDescriptors(ChannelBuffer cb) throws BGPParseException { |
| 123 | LinkedList<BGPValueType> prefixDescriptor = new LinkedList<>(); |
| 124 | BGPValueType tlv = null; |
| 125 | boolean isIpReachInfo = false; |
| 126 | ChannelBuffer tempCb; |
| 127 | int count = 0; |
| 128 | |
| 129 | while (cb.readableBytes() > 0) { |
| 130 | ChannelBuffer tempBuf = cb; |
| 131 | short type = cb.readShort(); |
| 132 | short length = cb.readShort(); |
| 133 | if (cb.readableBytes() < length) { |
| 134 | //length + 4 implies data contains type, length and value |
| 135 | throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.OPTIONAL_ATTRIBUTE_ERROR, |
| 136 | tempBuf.readBytes(cb.readableBytes() + TYPE_AND_LEN)); |
| 137 | } |
| 138 | tempCb = cb.readBytes(length); |
| 139 | switch (type) { |
| 140 | case OSPFRouteTypeTlv.TYPE: |
| 141 | tlv = OSPFRouteTypeTlv.read(tempCb); |
| 142 | break; |
| 143 | case IPReachabilityInformationTlv.TYPE: |
| 144 | tlv = IPReachabilityInformationTlv.read(tempCb, length); |
| 145 | isIpReachInfo = true; |
| 146 | break; |
| 147 | case BgpAttrNodeMultiTopologyId.ATTRNODE_MULTITOPOLOGY: |
| 148 | tlv = BgpAttrNodeMultiTopologyId.read(tempCb); |
| 149 | count = count + 1; |
| 150 | if (count > 1) { |
| 151 | //length + 4 implies data contains type, length and value |
| 152 | throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, |
| 153 | BGPErrorType.OPTIONAL_ATTRIBUTE_ERROR, tempBuf.readBytes(length + TYPE_AND_LEN)); |
| 154 | } |
| 155 | break; |
| 156 | default: |
| 157 | UnSupportedAttribute.skipBytes(tempCb, length); |
| 158 | } |
| 159 | prefixDescriptor.add(tlv); |
| 160 | } |
| 161 | |
| 162 | if (!isIpReachInfo) { |
| 163 | throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.OPTIONAL_ATTRIBUTE_ERROR, |
| 164 | null); |
| 165 | } |
| 166 | return prefixDescriptor; |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * Returns local node descriptors. |
| 171 | * |
| 172 | * @return local node descriptors |
| 173 | */ |
| 174 | public NodeDescriptors getLocalNodeDescriptors() { |
| 175 | return this.localNodeDescriptors; |
| 176 | } |
| 177 | |
| 178 | /** |
| 179 | * Returns Prefix descriptors. |
| 180 | * |
| 181 | * @return Prefix descriptors |
| 182 | */ |
| 183 | public LinkedList<BGPValueType> getPrefixdescriptor() { |
| 184 | return this.prefixDescriptor; |
| 185 | } |
| 186 | |
| 187 | @Override |
| 188 | public int hashCode() { |
| 189 | return Objects.hash(prefixDescriptor.hashCode(), localNodeDescriptors); |
| 190 | } |
| 191 | |
| 192 | @Override |
| 193 | public boolean equals(Object obj) { |
| 194 | if (this == obj) { |
| 195 | return true; |
| 196 | } |
| 197 | |
| 198 | if (obj instanceof BGPPrefixLSIdentifier) { |
| 199 | int countObjSubTlv = 0; |
| 200 | int countOtherSubTlv = 0; |
| 201 | boolean isCommonSubTlv = true; |
| 202 | BGPPrefixLSIdentifier other = (BGPPrefixLSIdentifier) obj; |
| 203 | |
| 204 | Iterator<BGPValueType> objListIterator = other.prefixDescriptor.iterator(); |
| 205 | countOtherSubTlv = other.prefixDescriptor.size(); |
| 206 | countObjSubTlv = prefixDescriptor.size(); |
| 207 | if (countObjSubTlv != countOtherSubTlv) { |
| 208 | return false; |
| 209 | } else { |
| 210 | while (objListIterator.hasNext() && isCommonSubTlv) { |
| 211 | BGPValueType subTlv = objListIterator.next(); |
| 212 | isCommonSubTlv = Objects.equals(prefixDescriptor.contains(subTlv), |
| 213 | other.prefixDescriptor.contains(subTlv)); |
| 214 | } |
| 215 | return isCommonSubTlv && Objects.equals(this.localNodeDescriptors, other.localNodeDescriptors); |
| 216 | } |
| 217 | } |
| 218 | return false; |
| 219 | } |
| 220 | |
| 221 | @Override |
| 222 | public String toString() { |
| 223 | return MoreObjects.toStringHelper(getClass()) |
| 224 | .add("localNodeDescriptors", localNodeDescriptors) |
| 225 | .add("prefixDescriptor", prefixDescriptor) |
| 226 | .toString(); |
| 227 | } |
Jonathan Hart | 317f476 | 2015-11-09 16:05:36 -0800 | [diff] [blame^] | 228 | } |