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org.opendaylight.protocol.bgp.rib.impl.StrictBGPPeerRegistry Maven / Gradle / Ivy
/*
* Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.protocol.bgp.rib.impl;
import static java.util.Objects.requireNonNull;
import com.google.common.base.MoreObjects;
import com.google.common.base.Preconditions;
import com.google.common.net.InetAddresses;
import com.google.common.primitives.UnsignedInts;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import javax.annotation.PreDestroy;
import javax.inject.Inject;
import javax.inject.Singleton;
import org.checkerframework.checker.lock.qual.GuardedBy;
import org.eclipse.jdt.annotation.Nullable;
import org.kohsuke.MetaInfServices;
import org.opendaylight.protocol.bgp.parser.AsNumberUtil;
import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
import org.opendaylight.protocol.bgp.parser.BGPError;
import org.opendaylight.protocol.bgp.parser.impl.message.open.As4CapabilityHandler;
import org.opendaylight.protocol.bgp.rib.impl.spi.BGPPeerRegistry;
import org.opendaylight.protocol.bgp.rib.impl.spi.BGPSessionPreferences;
import org.opendaylight.protocol.bgp.rib.impl.spi.PeerRegistryListener;
import org.opendaylight.protocol.bgp.rib.impl.spi.PeerRegistrySessionListener;
import org.opendaylight.protocol.bgp.rib.spi.BGPSessionListener;
import org.opendaylight.protocol.util.Ipv6Util;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.AsNumber;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IetfInetUtil;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddressNoZone;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4AddressNoZone;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6AddressNoZone;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.Open;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.open.message.BgpParameters;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.open.message.bgp.parameters.OptionalCapabilities;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.open.message.bgp.parameters.optional.capabilities.CParameters;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.open.message.bgp.parameters.optional.capabilities.CParametersBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.open.message.bgp.parameters.optional.capabilities.c.parameters.As4BytesCapability;
import org.opendaylight.yangtools.concepts.AbstractRegistration;
import org.opendaylight.yangtools.concepts.Registration;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Deactivate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* BGP peer registry that allows only 1 session per BGP peer. If a second session with peer is established, one of
* the sessions will be dropped. The session with lower source BGP id will be dropped. This class is thread-safe.
*/
@Singleton
@MetaInfServices
@Component(immediate = true, service = BGPPeerRegistry.class)
public final class StrictBGPPeerRegistry implements BGPPeerRegistry, AutoCloseable {
private static final Logger LOG = LoggerFactory.getLogger(StrictBGPPeerRegistry.class);
@GuardedBy("this")
private final Map peers = new HashMap<>();
@GuardedBy("this")
private final Map sessionIds = new HashMap<>();
@GuardedBy("this")
private final Map peerPreferences = new HashMap<>();
private final Set listeners = ConcurrentHashMap.newKeySet();
private final Set sessionListeners = ConcurrentHashMap.newKeySet();
@Inject
public StrictBGPPeerRegistry() {
// Exposed for DI
}
@Override
public synchronized void addPeer(final IpAddressNoZone oldIp, final BGPSessionListener peer,
final BGPSessionPreferences preferences) {
IpAddressNoZone fullIp = getFullIp(oldIp);
Preconditions.checkArgument(!peers.containsKey(fullIp),
"Peer for %s already present", fullIp);
peers.put(fullIp, requireNonNull(peer));
requireNonNull(preferences.getMyAs());
requireNonNull(preferences.getParams());
requireNonNull(preferences.getBgpId());
peerPreferences.put(fullIp, preferences);
for (final PeerRegistryListener peerRegistryListener : listeners) {
peerRegistryListener.onPeerAdded(fullIp, preferences);
}
}
private static IpAddressNoZone getFullIp(final IpAddressNoZone ip) {
final Ipv6AddressNoZone addr = ip.getIpv6AddressNoZone();
return addr == null ? ip : new IpAddressNoZone(Ipv6Util.getFullForm(addr));
}
@Override
public synchronized void removePeer(final IpAddressNoZone oldIp) {
IpAddressNoZone fullIp = getFullIp(oldIp);
peers.remove(fullIp);
for (final PeerRegistryListener peerRegistryListener : listeners) {
peerRegistryListener.onPeerRemoved(fullIp);
}
}
@Override
public synchronized void removePeerSession(final IpAddressNoZone oldIp) {
IpAddressNoZone fullIp = getFullIp(oldIp);
sessionIds.remove(fullIp);
for (final PeerRegistrySessionListener peerRegistrySessionListener : sessionListeners) {
peerRegistrySessionListener.onSessionRemoved(fullIp);
}
}
@Override
public boolean isPeerConfigured(final IpAddressNoZone oldIp) {
IpAddressNoZone fullIp = getFullIp(oldIp);
return peers.containsKey(fullIp);
}
private void checkPeerConfigured(final IpAddressNoZone ip) {
Preconditions.checkState(isPeerConfigured(ip),
"BGP peer with ip: %s not configured, configured peers are: %s",
ip, peers.keySet());
}
@Override
public synchronized BGPSessionListener getPeer(final IpAddressNoZone ip, final Ipv4AddressNoZone sourceId,
final Ipv4AddressNoZone remoteId, final Open openObj) throws BGPDocumentedException {
requireNonNull(ip);
requireNonNull(sourceId);
requireNonNull(remoteId);
final AsNumber remoteAsNumber = AsNumberUtil.advertizedAsNumber(openObj);
requireNonNull(remoteAsNumber);
final BGPSessionPreferences prefs = getPeerPreferences(ip);
checkPeerConfigured(ip);
final BGPSessionId currentConnection = new BGPSessionId(sourceId, remoteId, remoteAsNumber);
final BGPSessionListener p = peers.get(ip);
final BGPSessionId previousConnection = sessionIds.get(ip);
if (previousConnection != null) {
LOG.warn("Duplicate BGP session established with {}", ip);
// Session reestablished with different ids
if (!previousConnection.equals(currentConnection)) {
LOG.warn("BGP session with {} {} has to be dropped. Same session already present {}", ip,
currentConnection, previousConnection);
throw new BGPDocumentedException(
String.format("BGP session with %s %s has to be dropped. Same session already present %s",
ip, currentConnection, previousConnection),
BGPError.CEASE);
// Session reestablished with lower source bgp id, dropping current
} else if (previousConnection.isHigherDirection(currentConnection)
|| previousConnection.hasHigherAsNumber(currentConnection)) {
LOG.warn("BGP session with {} {} has to be dropped. Opposite session already present",
ip, currentConnection);
throw new BGPDocumentedException(
String.format("BGP session with %s initiated %s has to be dropped. "
+ "Opposite session already present", ip, currentConnection), BGPError.CEASE);
// Session reestablished with higher source bgp id, dropping previous
} else if (currentConnection.isHigherDirection(previousConnection)
|| currentConnection.hasHigherAsNumber(previousConnection)) {
LOG.warn("BGP session with {} {} released. Replaced by opposite session", ip, previousConnection);
peers.get(ip).releaseConnection();
return peers.get(ip);
// Session reestablished with same source bgp id, dropping current as duplicate
} else {
LOG.warn("BGP session with {} initiated from {} to {} has to be dropped. Same session already present",
ip, sourceId, remoteId);
throw new BGPDocumentedException(
String.format("BGP session with %s initiated %s has to be dropped. "
+ "Same session already present", ip, currentConnection), BGPError.CEASE);
}
}
validateAs(remoteAsNumber, openObj, prefs);
// Map session id to peer IP address
sessionIds.put(ip, currentConnection);
for (final PeerRegistrySessionListener peerRegistrySessionListener : sessionListeners) {
peerRegistrySessionListener.onSessionCreated(ip);
}
return p;
}
private static void validateAs(final AsNumber remoteAs, final Open openObj, final BGPSessionPreferences localPref)
throws BGPDocumentedException {
if (!remoteAs.equals(localPref.getExpectedRemoteAs())) {
LOG.warn("Unexpected remote AS number. Expecting {}, got {}", localPref.getExpectedRemoteAs(), remoteAs);
throw new BGPDocumentedException("Peer AS number mismatch", BGPError.BAD_PEER_AS);
}
// https://tools.ietf.org/html/rfc6286#section-2.2
if (openObj.getBgpIdentifier() != null
&& openObj.getBgpIdentifier().getValue().equals(localPref.getBgpId().getValue())) {
LOG.warn("Remote and local BGP Identifiers are the same: {}", openObj.getBgpIdentifier());
throw new BGPDocumentedException("Remote and local BGP Identifiers are the same.", BGPError.BAD_BGP_ID);
}
final List prefs = openObj.getBgpParameters();
if (prefs != null) {
final As4BytesCapability localCap = getAs4BytesCapability(localPref.getParams());
if (localCap != null && getAs4BytesCapability(prefs) == null) {
throw new BGPDocumentedException("The peer must advertise AS4Bytes capability.",
BGPError.UNSUPPORTED_CAPABILITY, serializeAs4BytesCapability(localCap));
}
if (!prefs.containsAll(localPref.getParams())) {
LOG.info("BGP Open message session parameters differ, session still accepted.");
}
} else {
throw new BGPDocumentedException("Open message unacceptable. Check the configuration of BGP speaker.",
BGPError.UNSPECIFIC_OPEN_ERROR);
}
}
private static @Nullable As4BytesCapability getAs4BytesCapability(final List prefs) {
for (final BgpParameters param : prefs) {
for (final OptionalCapabilities capa : param.nonnullOptionalCapabilities()) {
final CParameters cParam = capa.getCParameters();
final As4BytesCapability asCapa = cParam.getAs4BytesCapability();
if (asCapa != null) {
return asCapa;
}
}
}
return null;
}
private static byte[] serializeAs4BytesCapability(final As4BytesCapability as4Capability) {
final ByteBuf buffer = Unpooled.buffer(1 /*CODE*/ + 1 /*LENGTH*/ + Integer.BYTES /*4 byte value*/);
final As4CapabilityHandler serializer = new As4CapabilityHandler();
serializer.serializeCapability(new CParametersBuilder().setAs4BytesCapability(as4Capability).build(), buffer);
return buffer.array();
}
@Override
public BGPSessionPreferences getPeerPreferences(final IpAddressNoZone ip) {
requireNonNull(ip);
checkPeerConfigured(ip);
return peerPreferences.get(ip);
}
/**
* Creates IpAddress from SocketAddress. Only InetSocketAddress
* is accepted with inner address: Inet4Address and Inet6Address.
*
* @param socketAddress socket address to transform
* @return IpAddress equivalent to given socket address
* @throws IllegalArgumentException if submitted socket address is not InetSocketAddress[ipv4 | ipv6]
*/
public static IpAddressNoZone getIpAddress(final SocketAddress socketAddress) {
requireNonNull(socketAddress);
Preconditions.checkArgument(socketAddress instanceof InetSocketAddress,
"Expecting InetSocketAddress but was %s", socketAddress.getClass());
final InetAddress inetAddress = ((InetSocketAddress) socketAddress).getAddress();
Preconditions.checkArgument(inetAddress instanceof Inet4Address
|| inetAddress instanceof Inet6Address, "Expecting %s or %s but was %s",
Inet4Address.class, Inet6Address.class, inetAddress.getClass());
return IetfInetUtil.ipAddressNoZoneFor(inetAddress);
}
@Deactivate
@PreDestroy
@Override
public synchronized void close() {
peers.clear();
sessionIds.clear();
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this)
.add("peers", peers.keySet())
.toString();
}
/**
* Session identifier that contains (source Bgp Id) -> (destination Bgp Id) AsNumber is the remoteAs coming from
* remote Open message.
*/
private static final class BGPSessionId {
private final Ipv4Address from;
private final Ipv4Address to;
private final AsNumber asNumber;
BGPSessionId(final Ipv4Address from, final Ipv4Address to, final AsNumber asNumber) {
this.from = requireNonNull(from);
this.to = requireNonNull(to);
this.asNumber = requireNonNull(asNumber);
}
/**
* Equals does not take direction of connection into account id1 -> id2 and id2 -> id1 are equal.
*/
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
final BGPSessionId bGPSessionId = (BGPSessionId) obj;
if (!from.equals(bGPSessionId.from) && !from.equals(bGPSessionId.to)) {
return false;
}
if (!to.equals(bGPSessionId.to) && !to.equals(bGPSessionId.from)) {
return false;
}
return true;
}
@Override
public int hashCode() {
final int prime = 31;
int result = from.hashCode() + to.hashCode();
result = prime * result;
return result;
}
/**
* Check if this connection is equal to other and if it contains higher source bgp id.
*/
boolean isHigherDirection(final BGPSessionId other) {
return toLong(from) > toLong(other.from);
}
boolean hasHigherAsNumber(final BGPSessionId other) {
return asNumber.getValue().compareTo(other.asNumber.getValue()) > 0;
}
private static long toLong(final Ipv4Address from) {
final int i = InetAddresses.coerceToInteger(InetAddresses.forString(from.getValue()));
return UnsignedInts.toLong(i);
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this)
.add("from", from)
.add("to", to)
.toString();
}
}
@Override
public synchronized Registration registerPeerRegisterListener(final PeerRegistryListener listener) {
listeners.add(listener);
for (final Entry entry : peerPreferences.entrySet()) {
listener.onPeerAdded(entry.getKey(), entry.getValue());
}
return new AbstractRegistration() {
@Override
protected void removeRegistration() {
listeners.remove(listener);
}
};
}
@Override
public synchronized Registration registerPeerSessionListener(final PeerRegistrySessionListener listener) {
sessionListeners.add(listener);
for (final IpAddressNoZone ipAddress : sessionIds.keySet()) {
listener.onSessionCreated(ipAddress);
}
return new AbstractRegistration() {
@Override
protected void removeRegistration() {
sessionListeners.remove(listener);
}
};
}
@Override
public void updatePeerPreferences(final IpAddressNoZone address, final BGPSessionPreferences preferences) {
if (peerPreferences.containsKey(address)) {
peerPreferences.put(address, preferences);
}
}
}
