diff options
Diffstat (limited to 'framework/src/onos/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/ver4/BGPKeepaliveMsgVer4.java')
| -rw-r--r-- | framework/src/onos/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/ver4/BGPKeepaliveMsgVer4.java | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/framework/src/onos/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/ver4/BGPKeepaliveMsgVer4.java b/framework/src/onos/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/ver4/BGPKeepaliveMsgVer4.java new file mode 100644 index 00000000..a6668b3a --- /dev/null +++ b/framework/src/onos/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/ver4/BGPKeepaliveMsgVer4.java @@ -0,0 +1,172 @@ +/* + * 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.protocol.ver4; + +import org.jboss.netty.buffer.ChannelBuffer; +import org.onosproject.bgpio.exceptions.BGPParseException; +import org.onosproject.bgpio.protocol.BGPKeepaliveMsg; +import org.onosproject.bgpio.protocol.BGPMessageReader; +import org.onosproject.bgpio.protocol.BGPMessageWriter; +import org.onosproject.bgpio.types.BGPHeader; +import org.onosproject.bgpio.protocol.BGPType; +import org.onosproject.bgpio.protocol.BGPVersion; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import com.google.common.base.MoreObjects; + +/** + * Provides BGP keep alive message. + */ +class BGPKeepaliveMsgVer4 implements BGPKeepaliveMsg { + + /* + <Keepalive Message>::= <Common Header> + A KEEPALIVE message consists of only the message header and has a + length of 19 octets. + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + + + + | | + + + + | Marker | + + + + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Length | Type | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + REFERENCE : RFC 4271 + */ + + protected static final Logger log = LoggerFactory + .getLogger(BGPKeepaliveMsgVer4.class); + + private BGPHeader bgpMsgHeader; + public static final byte PACKET_VERSION = 4; + public static final int PACKET_MINIMUM_LENGTH = 19; + public static final int MARKER_LENGTH = 16; + public static final BGPType MSG_TYPE = BGPType.KEEP_ALIVE; + public static byte[] marker = new byte[] {(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, + (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, + (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, + (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff}; + + public static final BGPKeepaliveMsgVer4.Reader READER = new Reader(); + + /** + * Reader class for reading BGP keepalive message from channel buffer. + */ + static class Reader implements BGPMessageReader<BGPKeepaliveMsg> { + + @Override + public BGPKeepaliveMsg readFrom(ChannelBuffer cb, BGPHeader bgpHeader) + throws BGPParseException { + + /* bgpHeader is not required in case of keepalive message and + Header is already read and no other fields except header in keepalive message.*/ + return new BGPKeepaliveMsgVer4(); + } + } + + /** + * Default constructor. + */ + BGPKeepaliveMsgVer4() { + } + + /** + * Builder class for BGP keepalive message. + */ + static class Builder implements BGPKeepaliveMsg.Builder { + BGPHeader bgpMsgHeader; + + @Override + public BGPVersion getVersion() { + return BGPVersion.BGP_4; + } + + @Override + public BGPType getType() { + return BGPType.KEEP_ALIVE; + } + + @Override + public BGPHeader getHeader() { + return this.bgpMsgHeader; + } + + @Override + public Builder setHeader(BGPHeader bgpMsgHeader) { + this.bgpMsgHeader = bgpMsgHeader; + return this; + } + + @Override + public BGPKeepaliveMsg build() { + return new BGPKeepaliveMsgVer4(); + } + } + + @Override + public void writeTo(ChannelBuffer cb) { + WRITER.write(cb, this); + } + + static final Writer WRITER = new Writer(); + + /** + * Writer class for writing the BGP keepalive message to channel buffer. + */ + static class Writer implements BGPMessageWriter<BGPKeepaliveMsgVer4> { + + @Override + public void write(ChannelBuffer cb, BGPKeepaliveMsgVer4 message) { + + // write marker + cb.writeBytes(marker, 0, MARKER_LENGTH); + + // write length of header + cb.writeShort(PACKET_MINIMUM_LENGTH); + + // write the type of message + cb.writeByte(MSG_TYPE.getType()); + } + } + + @Override + public BGPVersion getVersion() { + return BGPVersion.BGP_4; + } + + @Override + public BGPType getType() { + return MSG_TYPE; + } + + @Override + public BGPHeader getHeader() { + return this.bgpMsgHeader; + } + + @Override + public String toString() { + return MoreObjects.toStringHelper(getClass()).toString(); + } +} |