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/*
* Copyright 2015-present Open Networking Foundation
*
* 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.onlab.packet.pim;
import org.onlab.packet.BasePacket;
import org.onlab.packet.Deserializer;
import org.onlab.packet.IpPrefix;
import java.nio.ByteBuffer;
import java.util.Collection;
import java.util.HashMap;
import static com.google.common.base.MoreObjects.toStringHelper;
import static org.onlab.packet.PacketUtils.checkInput;
public class PIMJoinPrune extends BasePacket {
private PIMAddrUnicast upstreamAddr = new PIMAddrUnicast();
private short holdTime = (short) 0xffff;
private HashMap joinPrunes = new HashMap<>();
/**
* Get the J/P hold time.
*
* @return specified in seconds.
*/
public short getHoldTime() {
return holdTime;
}
/**
* Set the J/P holdtime in seconds.
*
* @param holdTime return the holdtime.
*/
public void setHoldTime(short holdTime) {
this.holdTime = holdTime;
}
/**
* Get the upstreamAddr for this J/P request.
*
* @return the upstream address.
*/
public PIMAddrUnicast getUpstreamAddr() {
return upstreamAddr;
}
/**
* Set the upstream address of this PIM J/P request.
*
* @param upstr the PIM Upstream unicast address
*/
public void setUpstreamAddr(PIMAddrUnicast upstr) {
this.upstreamAddr = upstr;
}
/**
* Get the JoinPrune Group with all the joins and prunes.
*
* @return the joinPruneGroup collection
*/
public Collection getJoinPrunes() {
return joinPrunes.values();
}
/**
* Add the specified s,g to join field.
*
* @param saddr the source address of the route
* @param gaddr the group address of the route
* @param join true for a join, false for a prune.
*/
public void addJoinPrune(String saddr, String gaddr, boolean join) {
IpPrefix gpfx = IpPrefix.valueOf(gaddr);
IpPrefix spfx = IpPrefix.valueOf(saddr);
addJoinPrune(spfx, gpfx, join);
}
/**
* Add the specified S, G to the join field.
*
* @param spfx the source prefix of the route
* @param gpfx the group prefix of the route
* @param join true for join, false for prune
*/
public void addJoinPrune(IpPrefix spfx, IpPrefix gpfx, boolean join) {
PIMJoinPruneGroup jpg = joinPrunes.get(gpfx);
if (jpg == null) {
jpg = new PIMJoinPruneGroup(gpfx);
joinPrunes.put(gpfx, jpg);
}
HashMap members = (join) ? jpg.getJoins() : jpg.getPrunes();
if (members.get(spfx) == null) {
members.put(spfx, spfx);
}
}
/**
* Add a join given strings represending the source and group addresses.
*
* @param saddr source address
* @param gaddr group address
*/
public void addJoin(String saddr, String gaddr) {
this.addJoinPrune(saddr, gaddr, true);
}
/**
* Add a prune given strings represending the source and group addresses.
*
* @param saddr source address
* @param gaddr group address
*/
public void addPrune(String saddr, String gaddr) {
this.addJoinPrune(saddr, gaddr, false);
}
/**
* Sets all payloads parent packet if applicable, then serializes this
* packet and all payloads.
*
* @return a byte[] containing this packet and payloads
*/
@Override
public byte[] serialize() {
byte[] data = new byte[8096]; // Come up with something better
ByteBuffer bb = ByteBuffer.wrap(data);
bb.put(upstreamAddr.serialize());
bb.put((byte) 0); // reserved
int ngrps = joinPrunes.size();
bb.put((byte) ngrps);
bb.putShort(this.holdTime);
// Walk the group list and input all groups
for (PIMJoinPruneGroup jpg : joinPrunes.values()) {
PIMAddrGroup grp = new PIMAddrGroup(jpg.getGroup());
bb.put(grp.serialize());
// put the number of joins and prunes
bb.putShort((short) jpg.getJoins().size());
bb.putShort((short) jpg.getPrunes().size());
// Set all of the joins
for (IpPrefix spfx : jpg.getJoins().values()) {
PIMAddrSource src = new PIMAddrSource(spfx);
bb.put(src.serialize());
}
// Set all of the prunes
for (IpPrefix spfx : jpg.getPrunes().values()) {
PIMAddrSource src = new PIMAddrSource(spfx);
bb.put(src.serialize());
}
}
int len = bb.position();
byte[] data2 = new byte[len];
bb = ByteBuffer.wrap(data2, 0, len);
bb.put(data, 0, len);
return data2;
}
/**
* Return the J/P deserializer function.
*
* @return a function that will deserialize a J/P message.
*/
public static Deserializer deserializer() {
return (data, offset, length) -> {
/*
* Delay buffer checks until we read enough of the packet to know how
* much data we will require. Each encoded address deserializer function
* will ensure there is enough data for that address.
*/
PIMJoinPrune jp = new PIMJoinPrune();
final ByteBuffer bb = ByteBuffer.wrap(data, offset, length);
// We must get a PIM encoded unicast address
PIMAddrUnicast upstream = new PIMAddrUnicast();
upstream.deserialize(bb);
jp.setUpstreamAddr(upstream);
// Use this boolean to determine the buffer space we need according to address sizes
boolean ipv4 = upstream.getAddr().isIp4();
// We need at minimum 4 bytes for reserved(1), ngroups(1) & holdtime(2)
checkInput(bb.array(), bb.position(), bb.limit() - bb.position(), 4);
// get and skip the reserved byte
bb.get();
// Get the number of groups.
int ngroups = bb.get();
// Save the holdtime.
jp.setHoldTime(bb.getShort());
for (int i = 0; i < ngroups; i++) {
PIMAddrGroup grp = new PIMAddrGroup();
/*
* grp.deserialize will ensure the buffer has enough data to read the group address.
*/
grp.deserialize(bb);
checkInput(bb.array(), bb.position(), bb.limit() - bb.position(), 4);
int njoins = bb.getShort();
int nprunes = bb.getShort();
/*
* Now we'll verify we have enough buffer to read the next
* group of join and prune addresses for this group.
*/
int required = (njoins + nprunes) *
(ipv4 ? PIMAddrSource.ENC_SOURCE_IPV4_BYTE_LENGTH : PIMAddrSource.ENC_SOURCE_IPV6_BYTE_LENGTH);
checkInput(bb.array(), bb.position(), bb.limit() - bb.position(), required);
// Now iterate through the joins for this group
for (; njoins > 0; njoins--) {
PIMAddrSource src = new PIMAddrSource();
src.deserialize(bb);
jp.addJoinPrune(
src.getAddr().toIpPrefix(),
grp.getAddr().toIpPrefix(), true);
}
// Now iterate through the prunes for this group
for (; nprunes > 0; nprunes--) {
PIMAddrSource src = new PIMAddrSource();
src.deserialize(bb);
jp.addJoinPrune(
src.getAddr().toIpPrefix(),
grp.getAddr().toIpPrefix(), false);
}
}
return jp;
};
}
@Override
public String toString() {
return toStringHelper(getClass())
.add("upstreamAddr", upstreamAddr.toString())
.add("holdTime", Short.toString(holdTime))
.toString();
// TODO: need to handle joinPrunes
}
}
