Java tutorial
/* * Copyright (c) 2013 Pantheon Technologies s.r.o. and others. All rights reserved. * * This program and the accompanying materials are made available under the * terms of the Eclipse Public License v1.0 which accompanies this distribution, * and is available at http://www.eclipse.org/legal/epl-v10.html */ package org.opendaylight.openflowjava.protocol.impl.util; import io.netty.buffer.ByteBuf; import java.util.ArrayList; import java.util.List; import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv4Address; import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev100924.MacAddress; import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.common.types.rev130731.FlowWildcardsV10; import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev130731.match.v10.grouping.MatchV10; import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev130731.match.v10.grouping.MatchV10Builder; import com.google.common.base.Joiner; /** * Deserializes ofp_match (OpenFlow v1.0) structure * @author michal.polkorab */ public abstract class OF10MatchDeserializer { private static final byte PADDING_IN_MATCH = 1; private static final byte PADDING_IN_MATCH_2 = 2; private static final byte NW_SRC_BITS = 6; private static final byte NW_SRC_SHIFT = 8; private static final int NW_SRC_MASK = ((1 << NW_SRC_BITS) - 1) << NW_SRC_SHIFT; private static final byte NW_DST_BITS = 6; private static final byte NW_DST_SHIFT = 14; private static final int NW_DST_MASK = ((1 << NW_DST_BITS) - 1) << NW_DST_SHIFT; /** * Creates ofp_match (OpenFlow v1.0) structure * @param rawMessage ByteBuf with input data * @return ofp_match (OpenFlow v1.0) */ public static MatchV10 createMatchV10(ByteBuf rawMessage) { MatchV10Builder builder = new MatchV10Builder(); long wildcards = rawMessage.readUnsignedInt(); builder.setWildcards(createWildcards(wildcards)); builder.setNwSrcMask(decodeNwSrcMask(wildcards)); builder.setNwDstMask(decodeNwDstMask(wildcards)); builder.setInPort(rawMessage.readUnsignedShort()); byte[] dlSrc = new byte[EncodeConstants.MAC_ADDRESS_LENGTH]; rawMessage.readBytes(dlSrc); builder.setDlSrc(new MacAddress(ByteBufUtils.macAddressToString(dlSrc))); byte[] dlDst = new byte[EncodeConstants.MAC_ADDRESS_LENGTH]; rawMessage.readBytes(dlDst); builder.setDlDst(new MacAddress(ByteBufUtils.macAddressToString(dlDst))); builder.setDlVlan(rawMessage.readUnsignedShort()); builder.setDlVlanPcp(rawMessage.readUnsignedByte()); rawMessage.skipBytes(PADDING_IN_MATCH); builder.setDlType(rawMessage.readUnsignedShort()); builder.setNwTos(rawMessage.readUnsignedByte()); builder.setNwProto(rawMessage.readUnsignedByte()); rawMessage.skipBytes(PADDING_IN_MATCH_2); List<String> srcGroups = new ArrayList<>(); for (int i = 0; i < EncodeConstants.GROUPS_IN_IPV4_ADDRESS; i++) { srcGroups.add(Short.toString(rawMessage.readUnsignedByte())); } Joiner joiner = Joiner.on("."); builder.setNwSrc(new Ipv4Address(joiner.join(srcGroups))); List<String> dstGroups = new ArrayList<>(); for (int i = 0; i < EncodeConstants.GROUPS_IN_IPV4_ADDRESS; i++) { dstGroups.add(Short.toString(rawMessage.readUnsignedByte())); } builder.setNwDst(new Ipv4Address(joiner.join(dstGroups))); builder.setTpSrc(rawMessage.readUnsignedShort()); builder.setTpDst(rawMessage.readUnsignedShort()); return builder.build(); } /** * Decodes FlowWildcards * @param input input ByteBuf * @return decoded FlowWildcardsV10 */ public static FlowWildcardsV10 createWildcards(long input) { boolean _iNPORT = (input & (1 << 0)) != 0; boolean _dLVLAN = (input & (1 << 1)) != 0; boolean _dLSRC = (input & (1 << 2)) != 0; boolean _dLDST = (input & (1 << 3)) != 0; boolean _dLTYPE = (input & (1 << 4)) != 0; boolean _nWPROTO = (input & (1 << 5)) != 0; boolean _tPSRC = (input & (1 << 6)) != 0; boolean _tPDST = (input & (1 << 7)) != 0; boolean _dLVLANPCP = (input & (1 << 20)) != 0; boolean _nWTOS = (input & (1 << 21)) != 0; return new FlowWildcardsV10(_dLDST, _dLSRC, _dLTYPE, _dLVLAN, _dLVLANPCP, _iNPORT, _nWPROTO, _nWTOS, _tPDST, _tPSRC); } /** * Decodes NwSrcMask from FlowWildcards (represented as uint32) * @param input binary FlowWildcards * @return decoded NwSrcMask */ public static short decodeNwSrcMask(long input) { return (short) Math.max(32 - ((input & NW_SRC_MASK) >> NW_SRC_SHIFT), 0); } /** * Decodes NwDstMask from FlowWildcards (represented as uint32) * @param input binary FlowWildcards * @return decoded NwDstMask */ public static short decodeNwDstMask(long input) { return (short) Math.max(32 - ((input & NW_DST_MASK) >> NW_DST_SHIFT), 0); } }