2 * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
9 package org.opendaylight.protocol.bgp.rib.impl;
11 import static java.util.Objects.requireNonNull;
13 import com.google.common.base.MoreObjects;
14 import com.google.common.base.Optional;
15 import com.google.common.base.Preconditions;
16 import com.google.common.collect.Maps;
17 import com.google.common.net.InetAddresses;
18 import com.google.common.primitives.UnsignedInts;
19 import io.netty.buffer.ByteBuf;
20 import io.netty.buffer.Unpooled;
21 import java.net.Inet4Address;
22 import java.net.Inet6Address;
23 import java.net.InetAddress;
24 import java.net.InetSocketAddress;
25 import java.net.SocketAddress;
26 import java.util.HashSet;
27 import java.util.List;
29 import java.util.Map.Entry;
31 import javax.annotation.concurrent.GuardedBy;
32 import javax.annotation.concurrent.ThreadSafe;
33 import org.opendaylight.protocol.bgp.parser.AsNumberUtil;
34 import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
35 import org.opendaylight.protocol.bgp.parser.BGPError;
36 import org.opendaylight.protocol.bgp.parser.impl.message.open.As4CapabilityHandler;
37 import org.opendaylight.protocol.bgp.rib.impl.spi.BGPPeerRegistry;
38 import org.opendaylight.protocol.bgp.rib.impl.spi.BGPSessionPreferences;
39 import org.opendaylight.protocol.bgp.rib.impl.spi.PeerRegistryListener;
40 import org.opendaylight.protocol.bgp.rib.impl.spi.PeerRegistrySessionListener;
41 import org.opendaylight.protocol.bgp.rib.spi.BGPSessionListener;
42 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.AsNumber;
43 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IetfInetUtil;
44 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
45 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address;
46 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Open;
47 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.message.BgpParameters;
48 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.message.bgp.parameters.OptionalCapabilities;
49 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.message.bgp.parameters.optional.capabilities.CParameters;
50 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.message.bgp.parameters.optional.capabilities.CParametersBuilder;
51 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.message.bgp.parameters.optional.capabilities.c.parameters.As4BytesCapability;
52 import org.opendaylight.yangtools.concepts.AbstractRegistration;
53 import org.slf4j.Logger;
54 import org.slf4j.LoggerFactory;
57 * BGP peer registry that allows only 1 session per BGP peer.
58 * If second session with peer is established, one of the sessions will be dropped.
59 * The session with lower source BGP id will be dropped.
62 public final class StrictBGPPeerRegistry implements BGPPeerRegistry {
64 private static final Logger LOG = LoggerFactory.getLogger(StrictBGPPeerRegistry.class);
66 // TODO remove backwards compatibility
67 public static final StrictBGPPeerRegistry GLOBAL = new StrictBGPPeerRegistry();
70 private final Map<IpAddress, BGPSessionListener> peers = Maps.newHashMap();
72 private final Map<IpAddress, BGPSessionId> sessionIds = Maps.newHashMap();
74 private final Map<IpAddress, BGPSessionPreferences> peerPreferences = Maps.newHashMap();
76 private final Set<PeerRegistryListener> listeners = new HashSet<>();
78 private final Set<PeerRegistrySessionListener> sessionListeners = new HashSet<>();
80 public static BGPPeerRegistry instance() {
85 public synchronized void addPeer(final IpAddress ip, final BGPSessionListener peer, final BGPSessionPreferences preferences) {
87 Preconditions.checkArgument(!this.peers.containsKey(ip), "Peer for %s already present", ip);
88 this.peers.put(ip, requireNonNull(peer));
89 requireNonNull(preferences.getMyAs());
90 requireNonNull(preferences.getHoldTime());
91 requireNonNull(preferences.getParams());
92 requireNonNull(preferences.getBgpId());
93 this.peerPreferences.put(ip, preferences);
94 for (final PeerRegistryListener peerRegistryListener : this.listeners) {
95 peerRegistryListener.onPeerAdded(ip, preferences);
100 public synchronized void removePeer(final IpAddress ip) {
102 this.peers.remove(ip);
103 for (final PeerRegistryListener peerRegistryListener : this.listeners) {
104 peerRegistryListener.onPeerRemoved(ip);
109 public synchronized void removePeerSession(final IpAddress ip) {
111 this.sessionIds.remove(ip);
112 for (final PeerRegistrySessionListener peerRegistrySessionListener : this.sessionListeners) {
113 peerRegistrySessionListener.onSessionRemoved(ip);
118 public boolean isPeerConfigured(final IpAddress ip) {
120 return this.peers.containsKey(ip);
123 private void checkPeerConfigured(final IpAddress ip) {
124 Preconditions.checkState(isPeerConfigured(ip), "BGP peer with ip: %s not configured, configured peers are: %s", ip, this.peers.keySet());
128 public synchronized BGPSessionListener getPeer(final IpAddress ip, final Ipv4Address sourceId,
129 final Ipv4Address remoteId, final Open openObj) throws BGPDocumentedException {
131 requireNonNull(sourceId);
132 requireNonNull(remoteId);
133 final AsNumber remoteAsNumber = AsNumberUtil.advertizedAsNumber(openObj);
134 requireNonNull(remoteAsNumber);
136 final BGPSessionPreferences prefs = getPeerPreferences(ip);
138 checkPeerConfigured(ip);
140 final BGPSessionId currentConnection = new BGPSessionId(sourceId, remoteId, remoteAsNumber);
141 final BGPSessionListener p = this.peers.get(ip);
143 final BGPSessionId previousConnection = this.sessionIds.get(ip);
145 if (previousConnection != null) {
147 LOG.warn("Duplicate BGP session established with {}", ip);
149 // Session reestablished with different ids
150 if (!previousConnection.equals(currentConnection)) {
151 LOG.warn("BGP session with {} {} has to be dropped. Same session already present {}", ip, currentConnection, previousConnection);
152 throw new BGPDocumentedException(
153 String.format("BGP session with %s %s has to be dropped. Same session already present %s",
154 ip, currentConnection, previousConnection),
157 // Session reestablished with lower source bgp id, dropping current
158 } else if (previousConnection.isHigherDirection(currentConnection) ||
159 previousConnection.hasHigherAsNumber(currentConnection)) {
160 LOG.warn("BGP session with {} {} has to be dropped. Opposite session already present", ip, currentConnection);
161 throw new BGPDocumentedException(
162 String.format("BGP session with %s initiated %s has to be dropped. Opposite session already present",
163 ip, currentConnection),
166 // Session reestablished with higher source bgp id, dropping previous
167 } else if (currentConnection.isHigherDirection(previousConnection) ||
168 currentConnection.hasHigherAsNumber(previousConnection)) {
169 LOG.warn("BGP session with {} {} released. Replaced by opposite session", ip, previousConnection);
170 this.peers.get(ip).releaseConnection();
171 return this.peers.get(ip);
172 // Session reestablished with same source bgp id, dropping current as duplicate
174 LOG.warn("BGP session with %s initiated from %s to %s has to be dropped. Same session already present", ip, sourceId, remoteId);
175 throw new BGPDocumentedException(
176 String.format("BGP session with %s initiated %s has to be dropped. Same session already present",
177 ip, currentConnection),
181 validateAs(remoteAsNumber, openObj, prefs);
183 // Map session id to peer IP address
184 this.sessionIds.put(ip, currentConnection);
185 for (final PeerRegistrySessionListener peerRegistrySessionListener : this.sessionListeners) {
186 peerRegistrySessionListener.onSessionCreated(ip);
191 private static void validateAs(final AsNumber remoteAs, final Open openObj, final BGPSessionPreferences localPref) throws BGPDocumentedException {
192 if (!remoteAs.equals(localPref.getExpectedRemoteAs())) {
193 LOG.warn("Unexpected remote AS number. Expecting {}, got {}", remoteAs, localPref.getExpectedRemoteAs());
194 throw new BGPDocumentedException("Peer AS number mismatch", BGPError.BAD_PEER_AS);
197 // https://tools.ietf.org/html/rfc6286#section-2.2
198 if (openObj.getBgpIdentifier() != null && openObj.getBgpIdentifier().getValue().equals(localPref.getBgpId().getValue())) {
199 LOG.warn("Remote and local BGP Identifiers are the same: {}", openObj.getBgpIdentifier());
200 throw new BGPDocumentedException("Remote and local BGP Identifiers are the same.", BGPError.BAD_BGP_ID);
202 final List<BgpParameters> prefs = openObj.getBgpParameters();
204 if (getAs4BytesCapability(localPref.getParams()).isPresent() && !getAs4BytesCapability(prefs).isPresent()) {
205 throw new BGPDocumentedException("The peer must advertise AS4Bytes capability.", BGPError.UNSUPPORTED_CAPABILITY, serializeAs4BytesCapability(getAs4BytesCapability(localPref.getParams()).get()));
207 if (!prefs.containsAll(localPref.getParams())) {
208 LOG.info("BGP Open message session parameters differ, session still accepted.");
211 throw new BGPDocumentedException("Open message unacceptable. Check the configuration of BGP speaker.", BGPError.UNSPECIFIC_OPEN_ERROR);
215 private static Optional<As4BytesCapability> getAs4BytesCapability(final List<BgpParameters> prefs) {
216 for (final BgpParameters param : prefs) {
217 for (final OptionalCapabilities capa : param.getOptionalCapabilities()) {
218 final CParameters cParam = capa.getCParameters();
219 if (cParam.getAs4BytesCapability() != null) {
220 return Optional.of(cParam.getAs4BytesCapability());
224 return Optional.absent();
227 private static byte[] serializeAs4BytesCapability(final As4BytesCapability as4Capability) {
228 final ByteBuf buffer = Unpooled.buffer(1 /*CODE*/ + 1 /*LENGTH*/ + Integer.SIZE / Byte.SIZE /*4 byte value*/);
229 final As4CapabilityHandler serializer = new As4CapabilityHandler();
230 serializer.serializeCapability(new CParametersBuilder().setAs4BytesCapability(as4Capability).build(), buffer);
231 return buffer.array();
235 public BGPSessionPreferences getPeerPreferences(final IpAddress ip) {
237 checkPeerConfigured(ip);
238 return this.peerPreferences.get(ip);
242 * Creates IpAddress from SocketAddress. Only InetSocketAddress is accepted with inner address: Inet4Address and Inet6Address.
244 * @param socketAddress socket address to transform
245 * @return IpAddress equivalent to given socket address
246 * @throws IllegalArgumentException if submitted socket address is not InetSocketAddress[ipv4 | ipv6]
248 public static IpAddress getIpAddress(final SocketAddress socketAddress) {
249 requireNonNull(socketAddress);
250 Preconditions.checkArgument(socketAddress instanceof InetSocketAddress, "Expecting InetSocketAddress but was %s", socketAddress.getClass());
251 final InetAddress inetAddress = ((InetSocketAddress) socketAddress).getAddress();
253 Preconditions.checkArgument(inetAddress instanceof Inet4Address || inetAddress instanceof Inet6Address, "Expecting %s or %s but was %s", Inet4Address.class, Inet6Address.class, inetAddress.getClass());
254 return IetfInetUtil.INSTANCE.ipAddressFor(inetAddress);
258 public synchronized void close() {
260 this.sessionIds.clear();
264 public String toString() {
265 return MoreObjects.toStringHelper(this)
266 .add("peers", this.peers.keySet())
271 * Session identifier that contains (source Bgp Id) -> (destination Bgp Id) AsNumber is the remoteAs coming from
272 * remote Open message
274 private static final class BGPSessionId {
276 private final Ipv4Address from, to;
277 private final AsNumber asNumber;
279 BGPSessionId(final Ipv4Address from, final Ipv4Address to, final AsNumber asNumber) {
280 this.from = requireNonNull(from);
281 this.to = requireNonNull(to);
282 this.asNumber = requireNonNull(asNumber);
286 * Equals does not take direction of connection into account id1 -> id2 and id2 -> id1 are equal
289 public boolean equals(final Object o) {
293 if (o == null || getClass() != o.getClass()) {
297 final BGPSessionId bGPSessionId = (BGPSessionId) o;
299 if (!this.from.equals(bGPSessionId.from) && !this.from.equals(bGPSessionId.to)) {
302 if (!this.to.equals(bGPSessionId.to) && !this.to.equals(bGPSessionId.from)) {
310 public int hashCode() {
311 final int prime = 31;
312 int result = this.from.hashCode() + this.to.hashCode();
313 result = prime * result;
318 * Check if this connection is equal to other and if it contains higher source bgp id
320 boolean isHigherDirection(final BGPSessionId other) {
321 return toLong(this.from) > toLong(other.from);
324 boolean hasHigherAsNumber(final BGPSessionId other) {
325 return this.asNumber.getValue() > other.asNumber.getValue();
328 private static long toLong(final Ipv4Address from) {
329 final int i = InetAddresses.coerceToInteger(InetAddresses.forString(from.getValue()));
330 return UnsignedInts.toLong(i);
334 public String toString() {
335 return MoreObjects.toStringHelper(this)
336 .add("from", this.from)
343 public synchronized AutoCloseable registerPeerRegisterListener(final PeerRegistryListener listener) {
344 this.listeners.add(listener);
345 for (final Entry<IpAddress, BGPSessionPreferences> entry : this.peerPreferences.entrySet()) {
346 listener.onPeerAdded(entry.getKey(), entry.getValue());
348 return new AbstractRegistration() {
350 protected void removeRegistration() {
351 synchronized (StrictBGPPeerRegistry.this) {
352 StrictBGPPeerRegistry.this.listeners.remove(listener);
359 public synchronized AutoCloseable registerPeerSessionListener(final PeerRegistrySessionListener listener) {
360 this.sessionListeners.add(listener);
361 for (final IpAddress ipAddress : this.sessionIds.keySet()) {
362 listener.onSessionCreated(ipAddress);
364 return new AbstractRegistration() {
366 protected void removeRegistration() {
367 synchronized (StrictBGPPeerRegistry.this) {
368 StrictBGPPeerRegistry.this.sessionListeners.remove(listener);