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Diffstat (limited to 'framework/src/onos/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/AsPath.java')
| -rw-r--r-- | framework/src/onos/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/AsPath.java | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/framework/src/onos/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/AsPath.java b/framework/src/onos/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/AsPath.java new file mode 100644 index 00000000..2a050c44 --- /dev/null +++ b/framework/src/onos/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/AsPath.java @@ -0,0 +1,214 @@ +/* + * Copyright 2015 Open Networking Laboratory + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.onosproject.bgpio.types; + +import java.util.ArrayList; +import java.util.List; +import java.util.Objects; + +import org.jboss.netty.buffer.ChannelBuffer; +import org.onosproject.bgpio.exceptions.BgpParseException; +import org.onosproject.bgpio.util.Constants; +import org.onosproject.bgpio.util.Validation; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import com.google.common.base.MoreObjects; + +/** + * Provides Implementation of AsPath mandatory BGP Path Attribute. + */ +public class AsPath implements BgpValueType { + /** + * Enum to provide AS types. + */ + public enum ASTYPE { + AS_SET(1), AS_SEQUENCE(2), AS_CONFED_SEQUENCE(3), AS_CONFED_SET(4); + int value; + + /** + * Assign val with the value as the AS type. + * + * @param val AS type + */ + ASTYPE(int val) { + value = val; + } + + /** + * Returns value of AS type. + * + * @return AS type + */ + public byte type() { + return (byte) value; + } + } + + private static final Logger log = LoggerFactory.getLogger(AsPath.class); + public static final byte ASPATH_TYPE = 2; + public static final byte ASPATH_SET_TYPE = 1; + public static final byte ASPATH_SEQ_TYPE = 2; + public static final byte ASNUM_SIZE = 2; + + private boolean isAsPath = false; + private List<Short> aspathSet; + private List<Short> aspathSeq; + + /** + * Initialize Fields. + */ + public AsPath() { + this.aspathSeq = null; + this.aspathSet = null; + } + + /** + * Constructor to initialize parameters. + * + * @param aspathSet ASpath Set type + * @param aspathSeq ASpath Sequence type + */ + public AsPath(List<Short> aspathSet, List<Short> aspathSeq) { + this.aspathSeq = aspathSeq; + this.aspathSet = aspathSet; + this.isAsPath = true; + } + + /** + * Reads from the channel buffer and parses AsPath. + * + * @param cb ChannelBuffer + * @return object of AsPath + * @throws BgpParseException while parsing AsPath + */ + public static AsPath read(ChannelBuffer cb) throws BgpParseException { + List<Short> aspathSet = new ArrayList<>(); + List<Short> aspathSeq = new ArrayList<>(); + ChannelBuffer tempCb = cb.copy(); + Validation validation = Validation.parseAttributeHeader(cb); + + if (cb.readableBytes() < validation.getLength()) { + Validation.validateLen(BgpErrorType.UPDATE_MESSAGE_ERROR, BgpErrorType.ATTRIBUTE_LENGTH_ERROR, + validation.getLength()); + } + //if fourth bit is set, length is read as short otherwise as byte , len includes type, length and value + int len = validation.isShort() ? validation.getLength() + Constants.TYPE_AND_LEN_AS_SHORT : validation + .getLength() + Constants.TYPE_AND_LEN_AS_BYTE; + ChannelBuffer data = tempCb.readBytes(len); + if (validation.getFirstBit() && !validation.getSecondBit() && validation.getThirdBit()) { + throw new BgpParseException(BgpErrorType.UPDATE_MESSAGE_ERROR, BgpErrorType.ATTRIBUTE_FLAGS_ERROR, data); + } + + ChannelBuffer tempBuf = cb.readBytes(validation.getLength()); + while (tempBuf.readableBytes() > 0) { + byte pathSegType = tempBuf.readByte(); + //no of ASes + byte pathSegLen = tempBuf.readByte(); + int length = pathSegLen * ASNUM_SIZE; + if (tempBuf.readableBytes() < length) { + Validation.validateLen(BgpErrorType.UPDATE_MESSAGE_ERROR, + BgpErrorType.ATTRIBUTE_LENGTH_ERROR, length); + } + ChannelBuffer aspathBuf = tempBuf.readBytes(length); + while (aspathBuf.readableBytes() > 0) { + short asNum; + asNum = aspathBuf.readShort(); + switch (pathSegType) { + case ASPATH_SET_TYPE: + aspathSet.add(asNum); + break; + case ASPATH_SEQ_TYPE: + aspathSeq.add(asNum); + break; + default: log.debug("Other type Not Supported:" + pathSegType); + } + } + } + return new AsPath(aspathSet, aspathSeq); + } + + @Override + public short getType() { + return ASPATH_TYPE; + } + + /** + * Returns whether ASpath path attribute is present. + * + * @return whether ASpath path attribute is present + */ + public boolean isaspathSet() { + return this.isAsPath; + } + + /** + * Returns list of ASNum in ASpath Sequence. + * + * @return list of ASNum in ASpath Sequence + */ + public List<Short> asPathSeq() { + return this.aspathSeq; + } + + /** + * Returns list of ASNum in ASpath SET. + * + * @return list of ASNum in ASpath SET + */ + public List<Short> asPathSet() { + return this.aspathSet; + } + + @Override + public int hashCode() { + return Objects.hash(aspathSet, aspathSeq); + } + + @Override + public boolean equals(Object obj) { + if (this == obj) { + return true; + } + if (obj instanceof AsPath) { + AsPath other = (AsPath) obj; + return Objects.equals(aspathSet, other.aspathSet) && Objects.equals(aspathSeq, other.aspathSeq); + } + return false; + } + + @Override + public String toString() { + return MoreObjects.toStringHelper(getClass()) + .omitNullValues() + .add("aspathSet", aspathSet) + .add("aspathSeq", aspathSeq) + .toString(); + } + + @Override + public int write(ChannelBuffer cb) { + //Not required to Implement as of now + return 0; + } + + @Override + public int compareTo(Object o) { + // TODO Auto-generated method stub + return 0; + } +}
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