Thomas Vachuska | 781d18b | 2014-10-27 10:31:25 -0700 | [diff] [blame] | 1 | /* |
Jonathan Hart | f4bd048 | 2017-01-27 15:11:18 -0800 | [diff] [blame] | 2 | * Copyright 2017-present Open Networking Laboratory |
Thomas Vachuska | 781d18b | 2014-10-27 10:31:25 -0700 | [diff] [blame] | 3 | * |
Thomas Vachuska | 4f1a60c | 2014-10-28 13:39:07 -0700 | [diff] [blame] | 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 |
Thomas Vachuska | 781d18b | 2014-10-27 10:31:25 -0700 | [diff] [blame] | 7 | * |
Thomas Vachuska | 4f1a60c | 2014-10-28 13:39:07 -0700 | [diff] [blame] | 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. |
Thomas Vachuska | 781d18b | 2014-10-27 10:31:25 -0700 | [diff] [blame] | 15 | */ |
Jonathan Hart | f4bd048 | 2017-01-27 15:11:18 -0800 | [diff] [blame] | 16 | |
Jonathan Hart | 41349e9 | 2015-02-09 14:14:02 -0800 | [diff] [blame] | 17 | package org.onosproject.routing.bgp; |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 18 | |
| 19 | import org.jboss.netty.buffer.ChannelBuffer; |
| 20 | import org.jboss.netty.buffer.ChannelBuffers; |
| 21 | import org.jboss.netty.channel.ChannelHandlerContext; |
| 22 | import org.jboss.netty.channel.ChannelStateEvent; |
| 23 | import org.jboss.netty.channel.SimpleChannelHandler; |
Pavlin Radoslavov | 6b57073 | 2014-11-06 13:16:45 -0800 | [diff] [blame] | 24 | import org.onlab.packet.Ip4Address; |
| 25 | import org.onlab.packet.Ip4Prefix; |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 26 | |
Jonathan Hart | 41349e9 | 2015-02-09 14:14:02 -0800 | [diff] [blame] | 27 | import java.util.Collection; |
| 28 | |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 29 | /** |
| 30 | * Class for handling the remote BGP Peer session. |
| 31 | */ |
| 32 | class TestBgpPeerChannelHandler extends SimpleChannelHandler { |
| 33 | static final long PEER_AS = 65001; |
Pavlin Radoslavov | 4b5acae | 2015-01-28 17:09:45 -0800 | [diff] [blame] | 34 | static final long PEER_AS4 = 0x12345678; |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 35 | static final int PEER_HOLDTIME = 120; // 120 seconds |
Pavlin Radoslavov | 4b5acae | 2015-01-28 17:09:45 -0800 | [diff] [blame] | 36 | |
| 37 | final BgpSessionInfo localInfo = new BgpSessionInfo(); |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 38 | ChannelHandlerContext savedCtx; |
| 39 | |
| 40 | /** |
| 41 | * Constructor for given BGP ID. |
| 42 | * |
| 43 | * @param bgpId the BGP ID to use |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 44 | */ |
Pavlin Radoslavov | 0af11c1 | 2014-12-10 18:16:25 -0800 | [diff] [blame] | 45 | TestBgpPeerChannelHandler(Ip4Address bgpId) { |
Pavlin Radoslavov | 4b5acae | 2015-01-28 17:09:45 -0800 | [diff] [blame] | 46 | this.localInfo.setBgpVersion(BgpConstants.BGP_VERSION); |
| 47 | this.localInfo.setBgpId(bgpId); |
| 48 | this.localInfo.setAsNumber(PEER_AS); |
| 49 | this.localInfo.setHoldtime(PEER_HOLDTIME); |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | /** |
| 53 | * Closes the channel. |
| 54 | */ |
| 55 | void closeChannel() { |
| 56 | savedCtx.getChannel().close(); |
| 57 | } |
| 58 | |
| 59 | @Override |
| 60 | public void channelConnected(ChannelHandlerContext ctx, |
| 61 | ChannelStateEvent channelEvent) { |
| 62 | this.savedCtx = ctx; |
| 63 | // Prepare and transmit BGP OPEN message |
Pavlin Radoslavov | 4b5acae | 2015-01-28 17:09:45 -0800 | [diff] [blame] | 64 | ChannelBuffer message = BgpOpen.prepareBgpOpen(localInfo); |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 65 | ctx.getChannel().write(message); |
| 66 | |
| 67 | // Prepare and transmit BGP KEEPALIVE message |
Pavlin Radoslavov | 8a36ce3 | 2015-01-28 12:26:57 -0800 | [diff] [blame] | 68 | message = BgpKeepalive.prepareBgpKeepalive(); |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 69 | ctx.getChannel().write(message); |
| 70 | } |
| 71 | |
| 72 | @Override |
| 73 | public void channelDisconnected(ChannelHandlerContext ctx, |
| 74 | ChannelStateEvent channelEvent) { |
| 75 | // Nothing to do |
| 76 | } |
| 77 | |
| 78 | /** |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 79 | * Prepares BGP UPDATE message. |
| 80 | * |
| 81 | * @param nextHopRouter the next-hop router address for the routes to add |
Pavlin Radoslavov | 0af11c1 | 2014-12-10 18:16:25 -0800 | [diff] [blame] | 82 | * @param localPref the local preference for the routes to use |
| 83 | * @param multiExitDisc the MED value |
| 84 | * @param asPath the AS path for the routes to add |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 85 | * @param addedRoutes the routes to add |
| 86 | * @param withdrawnRoutes the routes to withdraw |
| 87 | * @return the message to transmit (BGP header included) |
| 88 | */ |
Pavlin Radoslavov | 6b57073 | 2014-11-06 13:16:45 -0800 | [diff] [blame] | 89 | ChannelBuffer prepareBgpUpdate(Ip4Address nextHopRouter, |
Pavlin Radoslavov | 0af11c1 | 2014-12-10 18:16:25 -0800 | [diff] [blame] | 90 | long localPref, |
| 91 | long multiExitDisc, |
| 92 | BgpRouteEntry.AsPath asPath, |
Pavlin Radoslavov | 6b57073 | 2014-11-06 13:16:45 -0800 | [diff] [blame] | 93 | Collection<Ip4Prefix> addedRoutes, |
| 94 | Collection<Ip4Prefix> withdrawnRoutes) { |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 95 | int attrFlags; |
| 96 | ChannelBuffer message = |
| 97 | ChannelBuffers.buffer(BgpConstants.BGP_MESSAGE_MAX_LENGTH); |
| 98 | ChannelBuffer pathAttributes = |
| 99 | ChannelBuffers.buffer(BgpConstants.BGP_MESSAGE_MAX_LENGTH); |
| 100 | |
| 101 | // Encode the Withdrawn Routes |
| 102 | ChannelBuffer encodedPrefixes = encodePackedPrefixes(withdrawnRoutes); |
| 103 | message.writeShort(encodedPrefixes.readableBytes()); |
| 104 | message.writeBytes(encodedPrefixes); |
| 105 | |
| 106 | // Encode the Path Attributes |
| 107 | // ORIGIN: IGP |
| 108 | attrFlags = 0x40; // Transitive flag |
| 109 | pathAttributes.writeByte(attrFlags); |
| 110 | pathAttributes.writeByte(BgpConstants.Update.Origin.TYPE); |
| 111 | pathAttributes.writeByte(1); // Data length |
| 112 | pathAttributes.writeByte(BgpConstants.Update.Origin.IGP); |
Pavlin Radoslavov | 0af11c1 | 2014-12-10 18:16:25 -0800 | [diff] [blame] | 113 | |
| 114 | // AS_PATH: asPath |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 115 | attrFlags = 0x40; // Transitive flag |
| 116 | pathAttributes.writeByte(attrFlags); |
| 117 | pathAttributes.writeByte(BgpConstants.Update.AsPath.TYPE); |
Pavlin Radoslavov | 0af11c1 | 2014-12-10 18:16:25 -0800 | [diff] [blame] | 118 | ChannelBuffer encodedAsPath = encodeAsPath(asPath); |
| 119 | pathAttributes.writeByte(encodedAsPath.readableBytes()); // Data length |
| 120 | pathAttributes.writeBytes(encodedAsPath); |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 121 | // NEXT_HOP: nextHopRouter |
| 122 | attrFlags = 0x40; // Transitive flag |
| 123 | pathAttributes.writeByte(attrFlags); |
| 124 | pathAttributes.writeByte(BgpConstants.Update.NextHop.TYPE); |
| 125 | pathAttributes.writeByte(4); // Data length |
| 126 | pathAttributes.writeInt(nextHopRouter.toInt()); // Next-hop router |
| 127 | // LOCAL_PREF: localPref |
| 128 | attrFlags = 0x40; // Transitive flag |
| 129 | pathAttributes.writeByte(attrFlags); |
| 130 | pathAttributes.writeByte(BgpConstants.Update.LocalPref.TYPE); |
| 131 | pathAttributes.writeByte(4); // Data length |
| 132 | pathAttributes.writeInt((int) localPref); // Preference value |
| 133 | // MULTI_EXIT_DISC: multiExitDisc |
| 134 | attrFlags = 0x80; // Optional |
| 135 | // Non-Transitive flag |
| 136 | pathAttributes.writeByte(attrFlags); |
| 137 | pathAttributes.writeByte(BgpConstants.Update.MultiExitDisc.TYPE); |
| 138 | pathAttributes.writeByte(4); // Data length |
| 139 | pathAttributes.writeInt((int) multiExitDisc); // Preference value |
| 140 | // The NLRI prefixes |
| 141 | encodedPrefixes = encodePackedPrefixes(addedRoutes); |
| 142 | |
| 143 | // Write the Path Attributes, beginning with its length |
| 144 | message.writeShort(pathAttributes.readableBytes()); |
| 145 | message.writeBytes(pathAttributes); |
| 146 | message.writeBytes(encodedPrefixes); |
| 147 | |
Pavlin Radoslavov | 8a36ce3 | 2015-01-28 12:26:57 -0800 | [diff] [blame] | 148 | return BgpMessage.prepareBgpMessage(BgpConstants.BGP_TYPE_UPDATE, |
| 149 | message); |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | /** |
| 153 | * Encodes a collection of IPv4 network prefixes in a packed format. |
| 154 | * <p> |
| 155 | * The IPv4 prefixes are encoded in the form: |
| 156 | * <Length, Prefix> where Length is the length in bits of the IPv4 prefix, |
| 157 | * and Prefix is the IPv4 prefix (padded with trailing bits to the end |
| 158 | * of an octet). |
| 159 | * |
| 160 | * @param prefixes the prefixes to encode |
| 161 | * @return the buffer with the encoded prefixes |
| 162 | */ |
Pavlin Radoslavov | 6b57073 | 2014-11-06 13:16:45 -0800 | [diff] [blame] | 163 | private ChannelBuffer encodePackedPrefixes(Collection<Ip4Prefix> prefixes) { |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 164 | ChannelBuffer message = |
| 165 | ChannelBuffers.buffer(BgpConstants.BGP_MESSAGE_MAX_LENGTH); |
| 166 | |
| 167 | // Write each of the prefixes |
Pavlin Radoslavov | 6b57073 | 2014-11-06 13:16:45 -0800 | [diff] [blame] | 168 | for (Ip4Prefix prefix : prefixes) { |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 169 | int prefixBitlen = prefix.prefixLength(); |
| 170 | int prefixBytelen = (prefixBitlen + 7) / 8; // Round-up |
| 171 | message.writeByte(prefixBitlen); |
| 172 | |
Pavlin Radoslavov | 6b57073 | 2014-11-06 13:16:45 -0800 | [diff] [blame] | 173 | Ip4Address address = prefix.address(); |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 174 | long value = address.toInt() & 0xffffffffL; |
Pavlin Radoslavov | 6b57073 | 2014-11-06 13:16:45 -0800 | [diff] [blame] | 175 | for (int i = 0; i < Ip4Address.BYTE_LENGTH; i++) { |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 176 | if (prefixBytelen-- == 0) { |
| 177 | break; |
| 178 | } |
| 179 | long nextByte = |
Pavlin Radoslavov | 6b57073 | 2014-11-06 13:16:45 -0800 | [diff] [blame] | 180 | (value >> ((Ip4Address.BYTE_LENGTH - i - 1) * 8)) & 0xff; |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 181 | message.writeByte((int) nextByte); |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | return message; |
| 186 | } |
| 187 | |
| 188 | /** |
Pavlin Radoslavov | 0af11c1 | 2014-12-10 18:16:25 -0800 | [diff] [blame] | 189 | * Encodes an AS path. |
| 190 | * |
| 191 | * @param asPath the AS path to encode |
| 192 | * @return the buffer with the encoded AS path |
| 193 | */ |
| 194 | private ChannelBuffer encodeAsPath(BgpRouteEntry.AsPath asPath) { |
| 195 | ChannelBuffer message = |
| 196 | ChannelBuffers.buffer(BgpConstants.BGP_MESSAGE_MAX_LENGTH); |
| 197 | |
| 198 | for (BgpRouteEntry.PathSegment pathSegment : asPath.getPathSegments()) { |
| 199 | message.writeByte(pathSegment.getType()); |
| 200 | message.writeByte(pathSegment.getSegmentAsNumbers().size()); |
| 201 | for (Long asNumber : pathSegment.getSegmentAsNumbers()) { |
| 202 | message.writeShort(asNumber.intValue()); |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | return message; |
| 207 | } |
Jonathan Hart | 20d8e51 | 2014-10-16 11:05:52 -0700 | [diff] [blame] | 208 | } |