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.rev171207.Open;
47 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev171207.open.message.BgpParameters;
48 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev171207.open.message.bgp.parameters.OptionalCapabilities;
49 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev171207.open.message.bgp.parameters.optional.capabilities.CParameters;
50 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev171207.open.message.bgp.parameters.optional.capabilities.CParametersBuilder;
51 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev171207.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);
67 private final Map<IpAddress, BGPSessionListener> peers = Maps.newHashMap();
69 private final Map<IpAddress, BGPSessionId> sessionIds = Maps.newHashMap();
71 private final Map<IpAddress, BGPSessionPreferences> peerPreferences = Maps.newHashMap();
73 private final Set<PeerRegistryListener> listeners = new HashSet<>();
75 private final Set<PeerRegistrySessionListener> sessionListeners = new HashSet<>();
77 public static BGPPeerRegistry instance() {
78 return new StrictBGPPeerRegistry();
82 public synchronized void addPeer(final IpAddress ip, final BGPSessionListener peer, final BGPSessionPreferences preferences) {
84 Preconditions.checkArgument(!this.peers.containsKey(ip), "Peer for %s already present", ip);
85 this.peers.put(ip, requireNonNull(peer));
86 requireNonNull(preferences.getMyAs());
87 requireNonNull(preferences.getHoldTime());
88 requireNonNull(preferences.getParams());
89 requireNonNull(preferences.getBgpId());
90 this.peerPreferences.put(ip, preferences);
91 for (final PeerRegistryListener peerRegistryListener : this.listeners) {
92 peerRegistryListener.onPeerAdded(ip, preferences);
97 public synchronized void removePeer(final IpAddress ip) {
99 this.peers.remove(ip);
100 for (final PeerRegistryListener peerRegistryListener : this.listeners) {
101 peerRegistryListener.onPeerRemoved(ip);
106 public synchronized void removePeerSession(final IpAddress ip) {
108 this.sessionIds.remove(ip);
109 for (final PeerRegistrySessionListener peerRegistrySessionListener : this.sessionListeners) {
110 peerRegistrySessionListener.onSessionRemoved(ip);
115 public boolean isPeerConfigured(final IpAddress ip) {
117 return this.peers.containsKey(ip);
120 private void checkPeerConfigured(final IpAddress ip) {
121 Preconditions.checkState(isPeerConfigured(ip), "BGP peer with ip: %s not configured, configured peers are: %s", ip, this.peers.keySet());
125 public synchronized BGPSessionListener getPeer(final IpAddress ip, final Ipv4Address sourceId,
126 final Ipv4Address remoteId, final Open openObj) throws BGPDocumentedException {
128 requireNonNull(sourceId);
129 requireNonNull(remoteId);
130 final AsNumber remoteAsNumber = AsNumberUtil.advertizedAsNumber(openObj);
131 requireNonNull(remoteAsNumber);
133 final BGPSessionPreferences prefs = getPeerPreferences(ip);
135 checkPeerConfigured(ip);
137 final BGPSessionId currentConnection = new BGPSessionId(sourceId, remoteId, remoteAsNumber);
138 final BGPSessionListener p = this.peers.get(ip);
140 final BGPSessionId previousConnection = this.sessionIds.get(ip);
142 if (previousConnection != null) {
144 LOG.warn("Duplicate BGP session established with {}", ip);
146 // Session reestablished with different ids
147 if (!previousConnection.equals(currentConnection)) {
148 LOG.warn("BGP session with {} {} has to be dropped. Same session already present {}", ip, currentConnection, previousConnection);
149 throw new BGPDocumentedException(
150 String.format("BGP session with %s %s has to be dropped. Same session already present %s",
151 ip, currentConnection, previousConnection),
154 // Session reestablished with lower source bgp id, dropping current
155 } else if (previousConnection.isHigherDirection(currentConnection) ||
156 previousConnection.hasHigherAsNumber(currentConnection)) {
157 LOG.warn("BGP session with {} {} has to be dropped. Opposite session already present", ip, currentConnection);
158 throw new BGPDocumentedException(
159 String.format("BGP session with %s initiated %s has to be dropped. Opposite session already present",
160 ip, currentConnection),
163 // Session reestablished with higher source bgp id, dropping previous
164 } else if (currentConnection.isHigherDirection(previousConnection) ||
165 currentConnection.hasHigherAsNumber(previousConnection)) {
166 LOG.warn("BGP session with {} {} released. Replaced by opposite session", ip, previousConnection);
167 this.peers.get(ip).releaseConnection();
168 return this.peers.get(ip);
169 // Session reestablished with same source bgp id, dropping current as duplicate
171 LOG.warn("BGP session with %s initiated from %s to %s has to be dropped. Same session already present", ip, sourceId, remoteId);
172 throw new BGPDocumentedException(
173 String.format("BGP session with %s initiated %s has to be dropped. Same session already present",
174 ip, currentConnection),
178 validateAs(remoteAsNumber, openObj, prefs);
180 // Map session id to peer IP address
181 this.sessionIds.put(ip, currentConnection);
182 for (final PeerRegistrySessionListener peerRegistrySessionListener : this.sessionListeners) {
183 peerRegistrySessionListener.onSessionCreated(ip);
188 private static void validateAs(final AsNumber remoteAs, final Open openObj, final BGPSessionPreferences localPref) throws BGPDocumentedException {
189 if (!remoteAs.equals(localPref.getExpectedRemoteAs())) {
190 LOG.warn("Unexpected remote AS number. Expecting {}, got {}", remoteAs, localPref.getExpectedRemoteAs());
191 throw new BGPDocumentedException("Peer AS number mismatch", BGPError.BAD_PEER_AS);
194 // https://tools.ietf.org/html/rfc6286#section-2.2
195 if (openObj.getBgpIdentifier() != null && openObj.getBgpIdentifier().getValue().equals(localPref.getBgpId().getValue())) {
196 LOG.warn("Remote and local BGP Identifiers are the same: {}", openObj.getBgpIdentifier());
197 throw new BGPDocumentedException("Remote and local BGP Identifiers are the same.", BGPError.BAD_BGP_ID);
199 final List<BgpParameters> prefs = openObj.getBgpParameters();
201 if (getAs4BytesCapability(localPref.getParams()).isPresent() && !getAs4BytesCapability(prefs).isPresent()) {
202 throw new BGPDocumentedException("The peer must advertise AS4Bytes capability.", BGPError.UNSUPPORTED_CAPABILITY, serializeAs4BytesCapability(getAs4BytesCapability(localPref.getParams()).get()));
204 if (!prefs.containsAll(localPref.getParams())) {
205 LOG.info("BGP Open message session parameters differ, session still accepted.");
208 throw new BGPDocumentedException("Open message unacceptable. Check the configuration of BGP speaker.", BGPError.UNSPECIFIC_OPEN_ERROR);
212 private static Optional<As4BytesCapability> getAs4BytesCapability(final List<BgpParameters> prefs) {
213 for (final BgpParameters param : prefs) {
214 for (final OptionalCapabilities capa : param.getOptionalCapabilities()) {
215 final CParameters cParam = capa.getCParameters();
216 if (cParam.getAs4BytesCapability() != null) {
217 return Optional.of(cParam.getAs4BytesCapability());
221 return Optional.absent();
224 private static byte[] serializeAs4BytesCapability(final As4BytesCapability as4Capability) {
225 final ByteBuf buffer = Unpooled.buffer(1 /*CODE*/ + 1 /*LENGTH*/ + Integer.SIZE / Byte.SIZE /*4 byte value*/);
226 final As4CapabilityHandler serializer = new As4CapabilityHandler();
227 serializer.serializeCapability(new CParametersBuilder().setAs4BytesCapability(as4Capability).build(), buffer);
228 return buffer.array();
232 public BGPSessionPreferences getPeerPreferences(final IpAddress ip) {
234 checkPeerConfigured(ip);
235 return this.peerPreferences.get(ip);
239 * Creates IpAddress from SocketAddress. Only InetSocketAddress is accepted with inner address: Inet4Address and Inet6Address.
241 * @param socketAddress socket address to transform
242 * @return IpAddress equivalent to given socket address
243 * @throws IllegalArgumentException if submitted socket address is not InetSocketAddress[ipv4 | ipv6]
245 public static IpAddress getIpAddress(final SocketAddress socketAddress) {
246 requireNonNull(socketAddress);
247 Preconditions.checkArgument(socketAddress instanceof InetSocketAddress, "Expecting InetSocketAddress but was %s", socketAddress.getClass());
248 final InetAddress inetAddress = ((InetSocketAddress) socketAddress).getAddress();
250 Preconditions.checkArgument(inetAddress instanceof Inet4Address || inetAddress instanceof Inet6Address, "Expecting %s or %s but was %s", Inet4Address.class, Inet6Address.class, inetAddress.getClass());
251 return IetfInetUtil.INSTANCE.ipAddressFor(inetAddress);
255 public synchronized void close() {
257 this.sessionIds.clear();
261 public String toString() {
262 return MoreObjects.toStringHelper(this)
263 .add("peers", this.peers.keySet())
268 * Session identifier that contains (source Bgp Id) -> (destination Bgp Id) AsNumber is the remoteAs coming from
269 * remote Open message
271 private static final class BGPSessionId {
273 private final Ipv4Address from, to;
274 private final AsNumber asNumber;
276 BGPSessionId(final Ipv4Address from, final Ipv4Address to, final AsNumber asNumber) {
277 this.from = requireNonNull(from);
278 this.to = requireNonNull(to);
279 this.asNumber = requireNonNull(asNumber);
283 * Equals does not take direction of connection into account id1 -> id2 and id2 -> id1 are equal
286 public boolean equals(final Object o) {
290 if (o == null || getClass() != o.getClass()) {
294 final BGPSessionId bGPSessionId = (BGPSessionId) o;
296 if (!this.from.equals(bGPSessionId.from) && !this.from.equals(bGPSessionId.to)) {
299 if (!this.to.equals(bGPSessionId.to) && !this.to.equals(bGPSessionId.from)) {
307 public int hashCode() {
308 final int prime = 31;
309 int result = this.from.hashCode() + this.to.hashCode();
310 result = prime * result;
315 * Check if this connection is equal to other and if it contains higher source bgp id
317 boolean isHigherDirection(final BGPSessionId other) {
318 return toLong(this.from) > toLong(other.from);
321 boolean hasHigherAsNumber(final BGPSessionId other) {
322 return this.asNumber.getValue() > other.asNumber.getValue();
325 private static long toLong(final Ipv4Address from) {
326 final int i = InetAddresses.coerceToInteger(InetAddresses.forString(from.getValue()));
327 return UnsignedInts.toLong(i);
331 public String toString() {
332 return MoreObjects.toStringHelper(this)
333 .add("from", this.from)
340 public synchronized AutoCloseable registerPeerRegisterListener(final PeerRegistryListener listener) {
341 this.listeners.add(listener);
342 for (final Entry<IpAddress, BGPSessionPreferences> entry : this.peerPreferences.entrySet()) {
343 listener.onPeerAdded(entry.getKey(), entry.getValue());
345 return new AbstractRegistration() {
347 protected void removeRegistration() {
348 synchronized (StrictBGPPeerRegistry.this) {
349 StrictBGPPeerRegistry.this.listeners.remove(listener);
356 public synchronized AutoCloseable registerPeerSessionListener(final PeerRegistrySessionListener listener) {
357 this.sessionListeners.add(listener);
358 for (final IpAddress ipAddress : this.sessionIds.keySet()) {
359 listener.onSessionCreated(ipAddress);
361 return new AbstractRegistration() {
363 protected void removeRegistration() {
364 synchronized (StrictBGPPeerRegistry.this) {
365 StrictBGPPeerRegistry.this.sessionListeners.remove(listener);