Jonathan Hart | 3930f63 | 2015-10-19 12:12:51 -0700 | [diff] [blame] | 1 | /* |
Brian O'Connor | a09fe5b | 2017-08-03 21:12:30 -0700 | [diff] [blame] | 2 | * Copyright 2017-present Open Networking Foundation |
Jonathan Hart | 3930f63 | 2015-10-19 12:12:51 -0700 | [diff] [blame] | 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 | |
| 17 | package org.onosproject.routing.fpm.protocol; |
| 18 | |
| 19 | import com.google.common.base.MoreObjects; |
| 20 | import com.google.common.collect.ImmutableList; |
| 21 | import org.onlab.packet.DeserializationException; |
| 22 | |
| 23 | import java.nio.ByteBuffer; |
| 24 | import java.util.ArrayList; |
| 25 | import java.util.List; |
| 26 | |
| 27 | import static org.onlab.packet.PacketUtils.checkInput; |
| 28 | |
| 29 | /** |
| 30 | * Netlink routing message (rtnetlink). |
| 31 | * <p> |
| 32 | * Taken from struct rtmsg in linux/rtnetlink.h |
| 33 | * </p> |
| 34 | */ |
| 35 | public final class RtNetlink { |
| 36 | |
| 37 | private static final int RT_NETLINK_LENGTH = 12; |
| 38 | |
| 39 | private static final int MASK = 0xff; |
| 40 | |
| 41 | private final short addressFamily; |
| 42 | private final int dstLength; |
| 43 | private final int srcLength; |
| 44 | private final short tos; |
| 45 | private final short table; |
Jonathan Hart | 916bf89 | 2016-01-27 16:42:55 -0800 | [diff] [blame] | 46 | private final RtProtocol protocol; |
Jonathan Hart | 3930f63 | 2015-10-19 12:12:51 -0700 | [diff] [blame] | 47 | private final short scope; |
| 48 | private final short type; |
| 49 | private final long flags; |
| 50 | |
| 51 | private final List<RouteAttribute> attributes; |
| 52 | |
| 53 | /** |
| 54 | * Class constructor. |
| 55 | * |
| 56 | * @param addressFamily address family |
| 57 | * @param dstLength destination address length |
| 58 | * @param srcLength source address length |
| 59 | * @param tos type of service |
| 60 | * @param table routing table |
| 61 | * @param protocol protocol |
| 62 | * @param scope scope |
| 63 | * @param type type |
| 64 | * @param flags flags |
| 65 | * @param attributes list of attributes |
| 66 | */ |
| 67 | private RtNetlink(short addressFamily, |
| 68 | int dstLength, |
| 69 | int srcLength, |
| 70 | short tos, |
| 71 | short table, |
Jonathan Hart | 916bf89 | 2016-01-27 16:42:55 -0800 | [diff] [blame] | 72 | RtProtocol protocol, |
Jonathan Hart | 3930f63 | 2015-10-19 12:12:51 -0700 | [diff] [blame] | 73 | short scope, |
| 74 | short type, |
| 75 | long flags, |
| 76 | List<RouteAttribute> attributes) { |
| 77 | |
| 78 | this.addressFamily = addressFamily; |
| 79 | this.dstLength = dstLength; |
| 80 | this.srcLength = srcLength; |
| 81 | this.tos = tos; |
| 82 | this.table = table; |
| 83 | this.protocol = protocol; |
| 84 | this.scope = scope; |
| 85 | this.type = type; |
| 86 | this.flags = flags; |
| 87 | |
| 88 | this.attributes = ImmutableList.copyOf(attributes); |
| 89 | |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * Returns the address family of the route. |
| 94 | * |
| 95 | * @return address family |
| 96 | */ |
| 97 | public short addressFamily() { |
| 98 | return addressFamily; |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * Returns the destination address length. |
| 103 | * |
| 104 | * @return destination address length |
| 105 | */ |
| 106 | public int dstLength() { |
| 107 | return dstLength; |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Returns the source address length. |
| 112 | * |
| 113 | * @return source address length |
| 114 | */ |
| 115 | public int srcLength() { |
| 116 | return srcLength; |
| 117 | } |
| 118 | |
| 119 | /** |
| 120 | * Returns the type of service. |
| 121 | * |
| 122 | * @return type of service |
| 123 | */ |
| 124 | public short tos() { |
| 125 | return tos; |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Returns the routing table. |
| 130 | * |
| 131 | * @return routing table |
| 132 | */ |
| 133 | public short table() { |
| 134 | return table; |
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * Returns the protocol. |
| 139 | * |
| 140 | * @return protocol |
| 141 | */ |
Jonathan Hart | 916bf89 | 2016-01-27 16:42:55 -0800 | [diff] [blame] | 142 | public RtProtocol protocol() { |
Jonathan Hart | 3930f63 | 2015-10-19 12:12:51 -0700 | [diff] [blame] | 143 | return protocol; |
| 144 | } |
| 145 | |
| 146 | /** |
| 147 | * Returns the route scope. |
| 148 | * |
| 149 | * @return scope |
| 150 | */ |
| 151 | public short scope() { |
| 152 | return scope; |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * Returns the route type. |
| 157 | * |
| 158 | * @return route type |
| 159 | */ |
| 160 | public short type() { |
| 161 | return type; |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * Returns the route flags. |
| 166 | * |
| 167 | * @return route flags |
| 168 | */ |
| 169 | public long flags() { |
| 170 | return flags; |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * Returns the list of route attributes. |
| 175 | * |
| 176 | * @return route attributes |
| 177 | */ |
| 178 | public List<RouteAttribute> attributes() { |
| 179 | return attributes; |
| 180 | } |
| 181 | |
| 182 | @Override |
| 183 | public String toString() { |
| 184 | return MoreObjects.toStringHelper(getClass()) |
| 185 | .add("addressFamily", addressFamily) |
| 186 | .add("dstLength", dstLength) |
| 187 | .add("srcLength", srcLength) |
| 188 | .add("tos", tos) |
| 189 | .add("table", table) |
| 190 | .add("protocol", protocol) |
| 191 | .add("scope", scope) |
| 192 | .add("type", type) |
| 193 | .add("flags", flags) |
| 194 | .add("attributes", attributes) |
| 195 | .toString(); |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * Decodes an rtnetlink message from an input buffer. |
| 200 | * |
| 201 | * @param buffer input buffer |
| 202 | * @param start starting position the rtnetlink message |
| 203 | * @param length length of the message |
| 204 | * @return rtnetlink message |
| 205 | * @throws DeserializationException if an rtnetlink message could not be |
| 206 | * decoded from the input buffer |
| 207 | */ |
| 208 | public static RtNetlink decode(byte[] buffer, int start, int length) |
| 209 | throws DeserializationException { |
| 210 | checkInput(buffer, start, length, RT_NETLINK_LENGTH); |
| 211 | |
| 212 | ByteBuffer bb = ByteBuffer.wrap(buffer, start, length); |
| 213 | |
| 214 | short addressFamily = (short) (bb.get() & MASK); |
| 215 | int dstLength = bb.get() & MASK; |
| 216 | int srcLength = bb.get() & MASK; |
| 217 | short tos = (short) (bb.get() & MASK); |
| 218 | short table = (short) (bb.get() & MASK); |
| 219 | short protocol = (short) (bb.get() & MASK); |
| 220 | short scope = (short) (bb.get() & MASK); |
| 221 | short type = (short) (bb.get() & MASK); |
| 222 | long flags = Integer.reverseBytes(bb.getInt()); |
| 223 | List<RouteAttribute> attributes = new ArrayList<>(); |
| 224 | |
Jonathan Hart | 916bf89 | 2016-01-27 16:42:55 -0800 | [diff] [blame] | 225 | RtProtocol rtProtocol = RtProtocol.get(protocol); |
| 226 | |
Jonathan Hart | 3930f63 | 2015-10-19 12:12:51 -0700 | [diff] [blame] | 227 | while (bb.hasRemaining()) { |
| 228 | RouteAttribute attribute = RouteAttribute.decode(buffer, bb.position(), |
| 229 | bb.limit() - bb.position()); |
| 230 | attributes.add(attribute); |
| 231 | bb.position(bb.position() + attribute.length()); |
| 232 | } |
| 233 | |
| 234 | return new RtNetlink( |
| 235 | addressFamily, |
| 236 | dstLength, |
| 237 | srcLength, |
| 238 | tos, |
| 239 | table, |
Jonathan Hart | 916bf89 | 2016-01-27 16:42:55 -0800 | [diff] [blame] | 240 | rtProtocol, |
Jonathan Hart | 3930f63 | 2015-10-19 12:12:51 -0700 | [diff] [blame] | 241 | scope, |
| 242 | type, |
| 243 | flags, |
| 244 | attributes); |
| 245 | } |
| 246 | |
| 247 | } |