Rusty Eddy | 80f1252 | 2015-09-03 22:42:02 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onlab.packet.pim; |
| 17 | |
| 18 | import org.onlab.packet.BasePacket; |
| 19 | import org.onlab.packet.Deserializer; |
| 20 | import org.onlab.packet.IPacket; |
| 21 | import org.onlab.packet.IpPrefix; |
| 22 | |
| 23 | import java.nio.ByteBuffer; |
| 24 | import java.util.HashMap; |
| 25 | |
| 26 | import static org.onlab.packet.PacketUtils.checkInput; |
| 27 | |
| 28 | public class PIMJoinPrune extends BasePacket { |
| 29 | |
| 30 | private PIMAddrUnicast upstreamAddr = new PIMAddrUnicast(); |
| 31 | private short holdTime = (short) 0xffff; |
| 32 | |
| 33 | private class JoinPruneGroup { |
| 34 | protected IpPrefix group; |
| 35 | protected HashMap<IpPrefix, IpPrefix> joins = new HashMap<>(); |
| 36 | protected HashMap<IpPrefix, IpPrefix> prunes = new HashMap<>(); |
| 37 | |
| 38 | public JoinPruneGroup(IpPrefix grp) { |
| 39 | group = grp; |
| 40 | } |
| 41 | } |
| 42 | private HashMap<IpPrefix, JoinPruneGroup> joinPrunes = new HashMap<>(); |
| 43 | |
| 44 | /** |
| 45 | * Get the J/P hold time. |
| 46 | * |
| 47 | * @return specified in seconds. |
| 48 | */ |
| 49 | public short getHoldTime() { |
| 50 | return holdTime; |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Set the J/P holdtime in seconds. |
| 55 | * |
| 56 | * @param holdTime return the holdtime. |
| 57 | */ |
| 58 | public void setHoldTime(short holdTime) { |
| 59 | this.holdTime = holdTime; |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * Get the upstreamAddr for this J/P request. |
| 64 | * |
| 65 | * @return the upstream address. |
| 66 | */ |
| 67 | public PIMAddrUnicast getUpstreamAddr() { |
| 68 | return upstreamAddr; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Set the upstream address of this PIM J/P request. |
| 73 | * |
| 74 | * @param upstr the PIM Upstream unicast address |
| 75 | */ |
| 76 | public void setUpstreamAddr(PIMAddrUnicast upstr) { |
| 77 | this.upstreamAddr = upstr; |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Add the specified s,g to join field. |
| 82 | * |
| 83 | * @param saddr the source address of the route |
| 84 | * @param gaddr the group address of the route |
| 85 | * @param join true for a join, false for a prune. |
| 86 | */ |
| 87 | public void addJoinPrune(String saddr, String gaddr, boolean join) { |
| 88 | IpPrefix gpfx = IpPrefix.valueOf(gaddr); |
| 89 | IpPrefix spfx = IpPrefix.valueOf(saddr); |
| 90 | addJoinPrune(spfx, gpfx, join); |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Add the specified S, G to the join field. |
| 95 | * |
| 96 | * @param spfx the source prefix of the route |
| 97 | * @param gpfx the group prefix of the route |
| 98 | * @param join true for join, false for prune |
| 99 | */ |
| 100 | public void addJoinPrune(IpPrefix spfx, IpPrefix gpfx, boolean join) { |
| 101 | JoinPruneGroup jpg = joinPrunes.get(gpfx); |
| 102 | if (jpg == null) { |
| 103 | jpg = new JoinPruneGroup(gpfx); |
| 104 | joinPrunes.put(gpfx, jpg); |
| 105 | } |
| 106 | |
| 107 | HashMap<IpPrefix, IpPrefix> members = (join) ? jpg.joins : jpg.prunes; |
| 108 | if (members.get(spfx) == null) { |
| 109 | members.put(spfx, spfx); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Add a join given strings represending the source and group addresses. |
| 115 | * |
| 116 | * @param saddr source address |
| 117 | * @param gaddr group address |
| 118 | */ |
| 119 | public void addJoin(String saddr, String gaddr) { |
| 120 | this.addJoinPrune(saddr, gaddr, true); |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * Add a prune given strings represending the source and group addresses. |
| 125 | * |
| 126 | * @param saddr source address |
| 127 | * @param gaddr group address |
| 128 | */ |
| 129 | public void addPrune(String saddr, String gaddr) { |
| 130 | this.addJoinPrune(saddr, gaddr, false); |
| 131 | } |
| 132 | |
| 133 | /** |
| 134 | * Sets all payloads parent packet if applicable, then serializes this |
| 135 | * packet and all payloads. |
| 136 | * |
| 137 | * @return a byte[] containing this packet and payloads |
| 138 | */ |
| 139 | @Override |
| 140 | public byte[] serialize() { |
| 141 | |
| 142 | byte[] data = new byte[8096]; // Come up with something better |
| 143 | ByteBuffer bb = ByteBuffer.wrap(data); |
| 144 | |
| 145 | bb.put(upstreamAddr.serialize()); |
| 146 | bb.put((byte) 0); // reserved |
| 147 | |
| 148 | int ngrps = joinPrunes.size(); |
| 149 | bb.put((byte) ngrps); |
| 150 | bb.putShort(this.holdTime); |
| 151 | |
| 152 | // Walk the group list and input all groups |
| 153 | for (JoinPruneGroup jpg : joinPrunes.values()) { |
| 154 | PIMAddrGroup grp = new PIMAddrGroup(jpg.group); |
| 155 | bb.put(grp.serialize()); |
| 156 | |
| 157 | // put the number of joins and prunes |
| 158 | bb.putShort((short) jpg.joins.size()); |
| 159 | bb.putShort((short) jpg.prunes.size()); |
| 160 | |
| 161 | // Set all of the joins |
| 162 | for (IpPrefix spfx : jpg.joins.values()) { |
| 163 | PIMAddrSource src = new PIMAddrSource(spfx); |
| 164 | bb.put(src.serialize()); |
| 165 | } |
| 166 | |
| 167 | // Set all of the prunes |
| 168 | for (IpPrefix spfx : jpg.prunes.values()) { |
| 169 | PIMAddrSource src = new PIMAddrSource(spfx); |
| 170 | bb.put(src.serialize()); |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | int len = bb.position(); |
| 175 | byte[] data2 = new byte[len]; |
| 176 | bb = ByteBuffer.wrap(data2, 0, len); |
| 177 | bb.put(data, 0, len); |
| 178 | return data2; |
| 179 | } |
| 180 | |
| 181 | // TODO: I suppose I really need to implement this? |
| 182 | @Override |
| 183 | public IPacket deserialize(final byte[] data, final int offset, |
| 184 | final int length) { |
| 185 | final ByteBuffer bb = ByteBuffer.wrap(data, offset, length); |
| 186 | return this; |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * Return the J/P deserializer function. |
| 191 | * |
| 192 | * @return a function that will deserialize a J/P message. |
| 193 | */ |
| 194 | public static Deserializer<PIMJoinPrune> deserializer() { |
| 195 | return (data, offset, length) -> { |
| 196 | |
| 197 | /* |
| 198 | * Delay buffer checks until we read enough of the packet to know how |
| 199 | * much data we will require. Each encoded address deserializer function |
| 200 | * will ensure there is enough data for that address. |
| 201 | */ |
| 202 | PIMJoinPrune jp = new PIMJoinPrune(); |
| 203 | final ByteBuffer bb = ByteBuffer.wrap(data, offset, length); |
| 204 | |
| 205 | // We must get a PIM encoded unicast address |
| 206 | PIMAddrUnicast upstream = new PIMAddrUnicast(); |
| 207 | upstream.deserialize(bb); |
| 208 | jp.setUpstreamAddr(upstream); |
| 209 | |
| 210 | // Use this boolean to determine the buffer space we need according to address sizes |
| 211 | boolean ipv4 = upstream.getAddr().isIp4(); |
| 212 | |
| 213 | // We need at minimum 4 bytes for reserved(1), ngroups(1) & holdtime(2) |
| 214 | checkInput(bb.array(), bb.position(), bb.limit() - bb.position(), 4); |
| 215 | |
| 216 | // get and skip the reserved byte |
| 217 | bb.get(); |
| 218 | |
| 219 | // Get the number of groups. |
| 220 | int ngroups = bb.get(); |
| 221 | |
| 222 | // Save the holdtime. |
| 223 | jp.setHoldTime(bb.getShort()); |
| 224 | |
| 225 | |
| 226 | for (int i = 0; i < ngroups; i++) { |
| 227 | PIMAddrGroup grp = new PIMAddrGroup(); |
| 228 | |
| 229 | /* |
| 230 | * grp.deserialize will ensure the buffer has enough data to read the group address. |
| 231 | */ |
| 232 | grp.deserialize(bb); |
| 233 | |
| 234 | checkInput(bb.array(), bb.position(), bb.limit() - bb.position(), 4); |
| 235 | int njoins = bb.getShort(); |
| 236 | int nprunes = bb.getShort(); |
| 237 | |
| 238 | /* |
| 239 | * Now we'll verify we have enough buffer to read the next |
| 240 | * group of join and prune addresses for this group. |
| 241 | */ |
| 242 | int required = (njoins + nprunes) * |
| 243 | (ipv4 ? PIMAddrSource.ENC_SOURCE_IPV4_BYTE_LENGTH : PIMAddrSource.ENC_SOURCE_IPV6_BYTE_LENGTH); |
| 244 | checkInput(bb.array(), bb.position(), bb.limit() - bb.position(), required); |
| 245 | |
| 246 | // Now iterate through the joins for this group |
| 247 | for (; njoins > 0; njoins--) { |
| 248 | |
| 249 | PIMAddrSource src = new PIMAddrSource(); |
| 250 | src.deserialize(bb); |
| 251 | |
| 252 | jp.addJoinPrune( |
| 253 | src.getAddr().toIpPrefix(), |
| 254 | grp.getAddr().toIpPrefix(), true); |
| 255 | } |
| 256 | |
| 257 | // Now iterate through the prunes for this group |
| 258 | for (; nprunes > 0; nprunes--) { |
| 259 | |
| 260 | PIMAddrSource src = new PIMAddrSource(); |
| 261 | src.deserialize(bb); |
| 262 | jp.addJoinPrune( |
| 263 | src.getAddr().toIpPrefix(), |
| 264 | grp.getAddr().toIpPrefix(), false); |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | return jp; |
| 269 | }; |
| 270 | } |
| 271 | } |