Umesh Krishnaswamy | 345ee99 | 2012-12-13 20:29:48 -0800 | [diff] [blame] | 1 | /** |
| 2 | * Copyright (c) 2008 The Board of Trustees of The Leland Stanford Junior |
| 3 | * University |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| 6 | * not use this file except in compliance with the License. You may obtain |
| 7 | * a copy of the License at |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| 13 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| 14 | * License for the specific language governing permissions and limitations |
| 15 | * under the License. |
| 16 | **/ |
| 17 | |
| 18 | package org.openflow.protocol.factory; |
| 19 | |
| 20 | import java.util.ArrayList; |
| 21 | import java.util.List; |
| 22 | |
| 23 | import org.jboss.netty.buffer.ChannelBuffer; |
| 24 | import org.openflow.protocol.OFMessage; |
| 25 | import org.openflow.protocol.OFType; |
| 26 | import org.openflow.protocol.action.OFAction; |
| 27 | import org.openflow.protocol.action.OFActionType; |
| 28 | import org.openflow.protocol.statistics.OFStatistics; |
| 29 | import org.openflow.protocol.statistics.OFStatisticsType; |
| 30 | import org.openflow.protocol.statistics.OFVendorStatistics; |
| 31 | import org.openflow.protocol.vendor.OFByteArrayVendorData; |
| 32 | import org.openflow.protocol.vendor.OFVendorData; |
| 33 | import org.openflow.protocol.vendor.OFVendorDataType; |
| 34 | import org.openflow.protocol.vendor.OFVendorId; |
| 35 | |
| 36 | |
| 37 | /** |
| 38 | * A basic OpenFlow factory that supports naive creation of both Messages and |
| 39 | * Actions. |
| 40 | * |
| 41 | * @author David Erickson (daviderickson@cs.stanford.edu) |
| 42 | * @author Rob Sherwood (rob.sherwood@stanford.edu) |
| 43 | * |
| 44 | */ |
| 45 | public class BasicFactory implements OFMessageFactory, OFActionFactory, |
| 46 | OFStatisticsFactory, OFVendorDataFactory { |
| 47 | @Override |
| 48 | public OFMessage getMessage(OFType t) { |
| 49 | return t.newInstance(); |
| 50 | } |
| 51 | |
| 52 | @Override |
| 53 | public List<OFMessage> parseMessage(ChannelBuffer data) throws MessageParseException { |
| 54 | List<OFMessage> msglist = new ArrayList<OFMessage>(); |
| 55 | OFMessage msg = null; |
| 56 | |
| 57 | while (data.readableBytes() >= OFMessage.MINIMUM_LENGTH) { |
| 58 | data.markReaderIndex(); |
| 59 | msg = this.parseMessageOne(data); |
| 60 | if (msg == null) { |
| 61 | data.resetReaderIndex(); |
| 62 | break; |
| 63 | } |
| 64 | else { |
| 65 | msglist.add(msg); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | if (msglist.size() == 0) { |
| 70 | return null; |
| 71 | } |
| 72 | return msglist; |
| 73 | |
| 74 | } |
| 75 | |
| 76 | public OFMessage parseMessageOne(ChannelBuffer data) throws MessageParseException { |
| 77 | try { |
| 78 | OFMessage demux = new OFMessage(); |
| 79 | OFMessage ofm = null; |
| 80 | |
| 81 | if (data.readableBytes() < OFMessage.MINIMUM_LENGTH) |
| 82 | return ofm; |
| 83 | |
| 84 | data.markReaderIndex(); |
| 85 | demux.readFrom(data); |
| 86 | data.resetReaderIndex(); |
| 87 | |
| 88 | if (demux.getLengthU() > data.readableBytes()) |
| 89 | return ofm; |
| 90 | |
| 91 | ofm = getMessage(demux.getType()); |
| 92 | if (ofm == null) |
| 93 | return null; |
| 94 | |
| 95 | if (ofm instanceof OFActionFactoryAware) { |
| 96 | ((OFActionFactoryAware)ofm).setActionFactory(this); |
| 97 | } |
| 98 | if (ofm instanceof OFMessageFactoryAware) { |
| 99 | ((OFMessageFactoryAware)ofm).setMessageFactory(this); |
| 100 | } |
| 101 | if (ofm instanceof OFStatisticsFactoryAware) { |
| 102 | ((OFStatisticsFactoryAware)ofm).setStatisticsFactory(this); |
| 103 | } |
| 104 | if (ofm instanceof OFVendorDataFactoryAware) { |
| 105 | ((OFVendorDataFactoryAware)ofm).setVendorDataFactory(this); |
| 106 | } |
| 107 | ofm.readFrom(data); |
| 108 | if (OFMessage.class.equals(ofm.getClass())) { |
| 109 | // advance the position for un-implemented messages |
| 110 | data.readerIndex(data.readerIndex()+(ofm.getLengthU() - |
| 111 | OFMessage.MINIMUM_LENGTH)); |
| 112 | } |
| 113 | |
| 114 | return ofm; |
| 115 | } catch (Exception e) { |
| 116 | /* Write the offending data along with the error message */ |
| 117 | data.resetReaderIndex(); |
| 118 | String msg = |
| 119 | "Message Parse Error for packet:" + dumpBuffer(data) + |
| 120 | "\nException: " + e.toString(); |
| 121 | data.resetReaderIndex(); |
| 122 | |
| 123 | throw new MessageParseException(msg, e); |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | @Override |
| 128 | public OFAction getAction(OFActionType t) { |
| 129 | return t.newInstance(); |
| 130 | } |
| 131 | |
| 132 | @Override |
| 133 | public List<OFAction> parseActions(ChannelBuffer data, int length) { |
| 134 | return parseActions(data, length, 0); |
| 135 | } |
| 136 | |
| 137 | @Override |
| 138 | public List<OFAction> parseActions(ChannelBuffer data, int length, int limit) { |
| 139 | List<OFAction> results = new ArrayList<OFAction>(); |
| 140 | OFAction demux = new OFAction(); |
| 141 | OFAction ofa; |
| 142 | int end = data.readerIndex() + length; |
| 143 | |
| 144 | while (limit == 0 || results.size() <= limit) { |
| 145 | if ((data.readableBytes() < OFAction.MINIMUM_LENGTH || |
| 146 | (data.readerIndex() + OFAction.MINIMUM_LENGTH) > end)) |
| 147 | return results; |
| 148 | |
| 149 | data.markReaderIndex(); |
| 150 | demux.readFrom(data); |
| 151 | data.resetReaderIndex(); |
| 152 | |
| 153 | if ((demux.getLengthU() > data.readableBytes() || |
| 154 | (data.readerIndex() + demux.getLengthU()) > end)) |
| 155 | return results; |
| 156 | |
| 157 | ofa = getAction(demux.getType()); |
| 158 | ofa.readFrom(data); |
| 159 | if (OFAction.class.equals(ofa.getClass())) { |
| 160 | // advance the position for un-implemented messages |
| 161 | data.readerIndex(data.readerIndex()+(ofa.getLengthU() - |
| 162 | OFAction.MINIMUM_LENGTH)); |
| 163 | } |
| 164 | results.add(ofa); |
| 165 | } |
| 166 | |
| 167 | return results; |
| 168 | } |
| 169 | |
| 170 | @Override |
| 171 | public OFActionFactory getActionFactory() { |
| 172 | return this; |
| 173 | } |
| 174 | |
| 175 | @Override |
| 176 | public OFStatistics getStatistics(OFType t, OFStatisticsType st) { |
| 177 | return st.newInstance(t); |
| 178 | } |
| 179 | |
| 180 | @Override |
| 181 | public List<OFStatistics> parseStatistics(OFType t, OFStatisticsType st, |
| 182 | ChannelBuffer data, int length) { |
| 183 | return parseStatistics(t, st, data, length, 0); |
| 184 | } |
| 185 | |
| 186 | /** |
| 187 | * @param t |
| 188 | * OFMessage type: should be one of stats_request or stats_reply |
| 189 | * @param st |
| 190 | * statistics type of this message, e.g., DESC, TABLE |
| 191 | * @param data |
| 192 | * buffer to read from |
| 193 | * @param length |
| 194 | * length of statistics |
| 195 | * @param limit |
| 196 | * number of statistics to grab; 0 == all |
| 197 | * |
| 198 | * @return list of statistics |
| 199 | */ |
| 200 | |
| 201 | @Override |
| 202 | public List<OFStatistics> parseStatistics(OFType t, OFStatisticsType st, |
| 203 | ChannelBuffer data, int length, int limit) { |
| 204 | List<OFStatistics> results = new ArrayList<OFStatistics>(); |
| 205 | OFStatistics statistics = getStatistics(t, st); |
| 206 | |
| 207 | int start = data.readerIndex(); |
| 208 | int count = 0; |
| 209 | |
| 210 | while (limit == 0 || results.size() <= limit) { |
| 211 | // TODO Create a separate MUX/DEMUX path for vendor stats |
| 212 | if (statistics instanceof OFVendorStatistics) |
| 213 | ((OFVendorStatistics)statistics).setLength(length); |
| 214 | |
| 215 | /** |
| 216 | * can't use data.remaining() here, b/c there could be other data |
| 217 | * buffered past this message |
| 218 | */ |
| 219 | if ((length - count) >= statistics.getLength()) { |
| 220 | if (statistics instanceof OFActionFactoryAware) |
| 221 | ((OFActionFactoryAware)statistics).setActionFactory(this); |
| 222 | statistics.readFrom(data); |
| 223 | results.add(statistics); |
| 224 | count += statistics.getLength(); |
| 225 | statistics = getStatistics(t, st); |
| 226 | } else { |
| 227 | if (count < length) { |
| 228 | /** |
| 229 | * Nasty case: partial/incomplete statistic found even |
| 230 | * though we have a full message. Found when NOX sent |
| 231 | * agg_stats request with wrong agg statistics length (52 |
| 232 | * instead of 56) |
| 233 | * |
| 234 | * just throw the rest away, or we will break framing |
| 235 | */ |
| 236 | data.readerIndex(start + length); |
| 237 | } |
| 238 | return results; |
| 239 | } |
| 240 | } |
| 241 | return results; // empty; no statistics at all |
| 242 | } |
| 243 | |
| 244 | |
| 245 | @Override |
| 246 | public OFVendorData getVendorData(OFVendorId vendorId, |
| 247 | OFVendorDataType vendorDataType) { |
| 248 | if (vendorDataType == null) |
| 249 | return null; |
| 250 | |
| 251 | return vendorDataType.newInstance(); |
| 252 | } |
| 253 | |
| 254 | /** |
| 255 | * Attempts to parse and return the OFVendorData contained in the given |
| 256 | * ChannelBuffer, beginning right after the vendor id. |
| 257 | * @param vendor the vendor id that was parsed from the OFVendor message. |
| 258 | * @param data the ChannelBuffer from which to parse the vendor data |
| 259 | * @param length the length to the end of the enclosing message. |
| 260 | * @return an OFVendorData instance |
| 261 | */ |
| 262 | public OFVendorData parseVendorData(int vendor, ChannelBuffer data, |
| 263 | int length) { |
| 264 | OFVendorDataType vendorDataType = null; |
| 265 | OFVendorId vendorId = OFVendorId.lookupVendorId(vendor); |
| 266 | if (vendorId != null) { |
| 267 | data.markReaderIndex(); |
| 268 | vendorDataType = vendorId.parseVendorDataType(data, length); |
| 269 | data.resetReaderIndex(); |
| 270 | } |
| 271 | |
| 272 | OFVendorData vendorData = getVendorData(vendorId, vendorDataType); |
| 273 | if (vendorData == null) |
| 274 | vendorData = new OFByteArrayVendorData(); |
| 275 | |
| 276 | vendorData.readFrom(data, length); |
| 277 | |
| 278 | return vendorData; |
| 279 | } |
| 280 | |
| 281 | public static String dumpBuffer(ChannelBuffer data) { |
| 282 | // NOTE: Reads all the bytes in buffer from current read offset. |
| 283 | // Set/Reset ReaderIndex if you want to read from a different location |
| 284 | int len = data.readableBytes(); |
| 285 | StringBuffer sb = new StringBuffer(); |
| 286 | for (int i=0 ; i<len; i++) { |
| 287 | if (i%32 == 0) sb.append("\n"); |
| 288 | if (i%4 == 0) sb.append(" "); |
| 289 | sb.append(String.format("%02x", data.getUnsignedByte(i))); |
| 290 | } |
| 291 | return sb.toString(); |
| 292 | } |
| 293 | |
| 294 | } |