Examples with BgpUnnumberedPeerConfig org.batfish.datamodel.BgpUnnumberedPeerConfig used on opensource projects

Example 1 with BgpUnnumberedPeerConfig

use of org.batfish.datamodel.BgpUnnumberedPeerConfig in project batfish by batfish.

the class BgpTopologyUtils method addUnnumberedPeerEdges.

private static void addUnnumberedPeerEdges(BgpPeerConfigId neighborId, MutableValueGraph<BgpPeerConfigId, BgpSessionProperties> graph, NetworkConfigurations nc, L3Adjacencies l3Adjacencies) {
    // neighbor will be null if neighborId has no peer interface defined
    BgpUnnumberedPeerConfig neighbor = nc.getBgpUnnumberedPeerConfig(neighborId);
    if (neighbor == null || neighbor.getLocalAs() == null || neighbor.getRemoteAsns().isEmpty()) {
        return;
    }
    Set<BgpPeerConfigId> alreadyEstablished = graph.adjacentNodes(neighborId);
    String hostname = neighborId.getHostname();
    NodeInterfacePair peerNip = NodeInterfacePair.of(hostname, neighborId.getPeerInterface());
    graph.nodes().stream().filter(candidateId -> !alreadyEstablished.contains(candidateId) && // Ensure candidate is unnumbered and has compatible local/remote AS
    bgpCandidatePassesSanityChecks(neighborId, neighbor, candidateId, nc) && // Check layer 2 connectivity
    l3Adjacencies.inSamePointToPointDomain(peerNip, NodeInterfacePair.of(candidateId.getHostname(), candidateId.getPeerInterface()))).forEach(remoteId -> addEdges(neighbor, neighborId, neighbor.getLocalIp(), remoteId, graph, nc));
}

Example 2 with BgpUnnumberedPeerConfig

use of org.batfish.datamodel.BgpUnnumberedPeerConfig in project batfish by batfish.

the class BgpTopologyUtils method initBgpTopology.

/**
 * Compute the BGP topology -- a network of {@link BgpPeerConfigId}s connected by {@link
 * BgpSessionProperties}.
 *
 * @param configurations node configurations, keyed by hostname
 * @param ipVrfOwners network Ip owners (see {@link IpOwners#computeIpNodeOwners(Map, boolean)}
 *     for reference)
 * @param keepInvalid whether to keep improperly configured neighbors. If performing configuration
 *     checks, you probably want this set to {@code true}, otherwise (e.g., computing dataplane)
 *     you want this to be {@code false}.
 * @param checkReachability whether to perform dataplane-level checks to ensure that neighbors are
 *     reachable and sessions can be established correctly. <b>Note:</b> this is different from
 *     {@code keepInvalid=false}, which only does filters invalid neighbors at the control-plane
 *     level
 * @param tracerouteEngine an instance of {@link TracerouteEngine} for doing reachability checks.
 * @param l3Adjacencies {@link L3Adjacencies} of the network, for checking BGP unnumbered
 *     reachability.
 * @return A graph ({@link Network}) representing all BGP peerings.
 */
@Nonnull
public static BgpTopology initBgpTopology(Map<String, Configuration> configurations, Map<Ip, Map<String, Set<String>>> ipVrfOwners, boolean keepInvalid, boolean checkReachability, @Nullable TracerouteEngine tracerouteEngine, Map<String, Map<String, Fib>> fibs, L3Adjacencies l3Adjacencies) {
    checkArgument(!checkReachability || !keepInvalid, "Cannot check reachability while keeping invalid peers");
    checkArgument(!checkReachability || tracerouteEngine != null, "Cannot check reachability without a traceroute engine");
    // TODO: handle duplicate ips on different vrfs
    NetworkConfigurations networkConfigurations = NetworkConfigurations.of(configurations);
    /*
     * First pass: identify all addresses "owned" by BgpNeighbors, add neighbor ids as vertices to
     * the graph; dynamically determine local IPs as needed
     */
    MutableValueGraph<BgpPeerConfigId, BgpSessionProperties> graph = ValueGraphBuilder.directed().allowsSelfLoops(false).build();
    /*
     * Multimap of active peers' BgpPeerConfigIds to all IPs that each peer may use as local IP
     * when initiating a session. For a peer with an explicitly configured local IP, that IP is
     * the only value associated with the peer in this map. Otherwise:
     * - If FIBs are provided, the map contains all local IPs with which the peer may initiate,
     *   as inferred by getPotentialSrcIps().
     * - Else no IPs are associated with the peer.
     */
    ImmutableSetMultimap.Builder<BgpPeerConfigId, Ip> localIpsBuilder = ImmutableSetMultimap.builder();
    for (Configuration node : configurations.values()) {
        String hostname = node.getHostname();
        for (Vrf vrf : node.getVrfs().values()) {
            String vrfName = vrf.getName();
            BgpProcess proc = vrf.getBgpProcess();
            if (proc == null) {
                // nothing to do if no bgp process on this VRF
                continue;
            }
            Fib fib = fibs.getOrDefault(hostname, ImmutableMap.of()).get(vrfName);
            for (Entry<Ip, BgpActivePeerConfig> e : proc.getActiveNeighbors().entrySet()) {
                Ip peerAddress = e.getKey();
                BgpActivePeerConfig config = e.getValue();
                if (!keepInvalid && !bgpConfigPassesSanityChecks(config, hostname, vrfName, ipVrfOwners)) {
                    continue;
                }
                BgpPeerConfigId neighborId = new BgpPeerConfigId(hostname, vrfName, peerAddress.toPrefix(), false);
                graph.addNode(neighborId);
                if (config.getLocalIp() != null) {
                    localIpsBuilder.put(neighborId, config.getLocalIp());
                } else if (fib != null) {
                    // No explicitly configured local IP. Check for dynamically resolvable local IPs.
                    localIpsBuilder.putAll(neighborId, getPotentialSrcIps(peerAddress, fib, node));
                }
            }
            // Dynamic peers: map of prefix to BgpPassivePeerConfig
            proc.getPassiveNeighbors().entrySet().stream().filter(entry -> keepInvalid || bgpConfigPassesSanityChecks(entry.getValue(), hostname, vrfName, ipVrfOwners)).forEach(entry -> graph.addNode(new BgpPeerConfigId(hostname, vrfName, entry.getKey(), true)));
            // Unnumbered BGP peers: map of interface name to BgpUnnumberedPeerConfig
            proc.getInterfaceNeighbors().entrySet().stream().filter(e -> keepInvalid || bgpConfigPassesSanityChecks(e.getValue(), hostname, vrfName, ipVrfOwners)).forEach(e -> graph.addNode(new BgpPeerConfigId(hostname, vrf.getName(), e.getKey())));
        }
    }
    // Second pass: add edges to the graph. Note, these are directed edges.
    Map<String, Multimap<String, BgpPeerConfigId>> receivers = new HashMap<>();
    for (BgpPeerConfigId peer : graph.nodes()) {
        if (peer.getType() == BgpPeerConfigType.UNNUMBERED) {
            // Unnumbered configs only form sessions with each other
            continue;
        }
        Multimap<String, BgpPeerConfigId> vrf = receivers.computeIfAbsent(peer.getHostname(), name -> LinkedListMultimap.create());
        vrf.put(peer.getVrfName(), peer);
    }
    SetMultimap<BgpPeerConfigId, Ip> localIps = localIpsBuilder.build();
    for (BgpPeerConfigId neighborId : graph.nodes()) {
        switch(neighborId.getType()) {
            case DYNAMIC:
                // Passive end of the peering cannot initiate a connection
                continue;
            case ACTIVE:
                addActivePeerEdges(neighborId, graph, networkConfigurations, ipVrfOwners, receivers, localIps.get(neighborId), checkReachability, tracerouteEngine);
                break;
            case UNNUMBERED:
                addUnnumberedPeerEdges(neighborId, graph, networkConfigurations, l3Adjacencies);
                break;
            default:
                throw new IllegalArgumentException(String.format("Unrecognized peer type: %s", neighborId));
        }
    }
    return new BgpTopology(graph);
}

Example 3 with BgpUnnumberedPeerConfig

use of org.batfish.datamodel.BgpUnnumberedPeerConfig in project batfish by batfish.

the class IspModelingUtilsTest method testIsValidBgpPeerForBorderInterfaceInfo_unnumbered.

@Test
public void testIsValidBgpPeerForBorderInterfaceInfo_unnumbered() {
    // missing remote ASN
    BgpUnnumberedPeerConfig invalidPeer = BgpUnnumberedPeerConfig.builder().setPeerInterface("iface").setLocalIp(LINK_LOCAL_IP).setLocalAs(2L).setIpv4UnicastAddressFamily(Ipv4UnicastAddressFamily.builder().build()).build();
    BgpUnnumberedPeerConfig validPeer = BgpUnnumberedPeerConfig.builder().setPeerInterface("iface").setRemoteAs(1L).setLocalIp(LINK_LOCAL_IP).setLocalAs(2L).setIpv4UnicastAddressFamily(Ipv4UnicastAddressFamily.builder().build()).build();
    assertFalse(isValidBgpPeerForBorderInterfaceInfo(invalidPeer, ImmutableSet.of(), ImmutableSet.of(), ALL_AS_NUMBERS));
    assertTrue(isValidBgpPeerForBorderInterfaceInfo(validPeer, ImmutableSet.of(), ImmutableSet.of(), ALL_AS_NUMBERS));
}

Example 4 with BgpUnnumberedPeerConfig

use of org.batfish.datamodel.BgpUnnumberedPeerConfig in project batfish by batfish.

the class IspModelingUtilsTest method testConnectIspToSnapshot_unnumbered.

@Test
public void testConnectIspToSnapshot_unnumbered() {
    BgpUnnumberedPeerConfig remotePeerConfig = BgpUnnumberedPeerConfig.builder().setPeerInterface(_snapshotInterfaceName).setRemoteAs(_ispAsn).setLocalIp(LINK_LOCAL_IP).setLocalAs(_snapshotAsn).setIpv4UnicastAddressFamily(Ipv4UnicastAddressFamily.builder().build()).build();
    String ispIfaceName = ispToSnapshotInterfaceName(_snapshotHostname, _snapshotInterfaceName);
    IspModel ispModel = IspModel.builder().setAsn(_ispAsn).setSnapshotConnections(new SnapshotConnection(ImmutableList.of(new IspInterface(ispIfaceName, LINK_LOCAL_ADDRESS, new Layer1Node(_snapshotHostname, _snapshotInterfaceName), null)), IspBgpUnnumberedPeer.create(remotePeerConfig, ispIfaceName))).build();
    Configuration ispConfiguration = createIspNode(ispModel, _logger).get();
    Set<Layer1Edge> layer1Edges = connectIspToSnapshot(ispModel, ispConfiguration, _logger);
    assertThat(ispConfiguration, allOf(hasInterface(ispToSnapshotInterfaceName(_snapshotHostname, _snapshotInterfaceName), hasAllAddresses(equalTo(ImmutableSet.of(LINK_LOCAL_ADDRESS))))));
    // compute the reverse config
    BgpProcess bgpProcess = testBgpProcess(Ip.ZERO);
    addBgpPeerToIsp(IspBgpUnnumberedPeer.create(remotePeerConfig, ispToSnapshotInterfaceName(_snapshotHostname, _snapshotInterfaceName)), bgpProcess, ispModel.getRole());
    BgpUnnumberedPeerConfig expectedIspPeerConfig = getOnlyElement(bgpProcess.getInterfaceNeighbors().values());
    assertThat(getOnlyElement(ispConfiguration.getVrfs().get(DEFAULT_VRF_NAME).getBgpProcess().getInterfaceNeighbors().values()), equalTo(expectedIspPeerConfig));
    assertThat(ispConfiguration.getRoutingPolicies(), hasKey(EXPORT_POLICY_ON_ISP_TO_CUSTOMERS));
    assertThat(layer1Edges, equalTo(ImmutableSet.of(new Layer1Edge(_snapshotHostname, _snapshotInterfaceName, _ispName, ispToSnapshotInterfaceName(_snapshotHostname, _snapshotInterfaceName)), new Layer1Edge(_ispName, ispToSnapshotInterfaceName(_snapshotHostname, _snapshotInterfaceName), _snapshotHostname, _snapshotInterfaceName))));
}

Example 5 with BgpUnnumberedPeerConfig

use of org.batfish.datamodel.BgpUnnumberedPeerConfig in project batfish by batfish.

the class BgpSessionCompatibilityAnswerer method getRows.

/**
 * Return the answer for {@link BgpSessionCompatibilityQuestion} -- a set of BGP sessions and
 * their compatibility.
 */
private List<Row> getRows(NetworkSnapshot snapshot, BgpSessionCompatibilityQuestion question) {
    Map<String, Configuration> configurations = _batfish.loadConfigurations(snapshot);
    NetworkConfigurations nc = NetworkConfigurations.of(configurations);
    SpecifierContext specifierContext = _batfish.specifierContext(snapshot);
    Set<String> nodes = question.getNodeSpecifier().resolve(specifierContext);
    Set<String> remoteNodes = question.getRemoteNodeSpecifier().resolve(specifierContext);
    L3Adjacencies l3Adjacencies = _batfish.getTopologyProvider().getInitialL3Adjacencies(snapshot);
    Map<Ip, Map<String, Set<String>>> ipVrfOwners = _batfish.getTopologyProvider().getInitialIpOwners(snapshot).getIpVrfOwners();
    ValueGraph<BgpPeerConfigId, BgpSessionProperties> configuredTopology = BgpTopologyUtils.initBgpTopology(configurations, ipVrfOwners, true, l3Adjacencies).getGraph();
    // Generate answer row for each BGP peer (or rows, for dynamic peers with multiple remotes)
    return configuredTopology.nodes().stream().flatMap(peerId -> {
        switch(peerId.getType()) {
            case ACTIVE:
                BgpActivePeerConfig activePeer = nc.getBgpPointToPointPeerConfig(peerId);
                assert activePeer != null;
                return Stream.of(getActivePeerRow(peerId, activePeer, ipVrfOwners, configuredTopology));
            case DYNAMIC:
                BgpPassivePeerConfig passivePeer = nc.getBgpDynamicPeerConfig(peerId);
                assert passivePeer != null;
                return getPassivePeerRows(peerId, passivePeer, nc, configuredTopology).stream();
            case UNNUMBERED:
                BgpUnnumberedPeerConfig unnumPeer = nc.getBgpUnnumberedPeerConfig(peerId);
                assert unnumPeer != null;
                return Stream.of(getUnnumberedPeerRow(peerId, unnumPeer, configuredTopology));
            default:
                throw new BatfishException(String.format("Unsupported type of BGP peer config: %s", peerId.getType()));
        }
    }).filter(row -> matchesQuestionFilters(row, nodes, remoteNodes, question)).collect(ImmutableList.toImmutableList());
}