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

Example 46 with Prefix

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

the class CounterExample method buildFlowTrace.

/*
   * Build flow information for a given hop along a path
   */
Tuple<Flow, FlowTrace> buildFlowTrace(Encoder enc, String router) {
    EncoderSlice slice = enc.getMainSlice();
    SymbolicPacket pkt = slice.getSymbolicPacket();
    SymbolicDecisions decisions = slice.getSymbolicDecisions();
    Flow f = buildFlow(pkt, router);
    SortedSet<String> visited = new TreeSet<>();
    List<FlowTraceHop> hops = new ArrayList<>();
    String current = router;
    while (true) {
        visited.add(current);
        // Get the forwarding variables
        Map<GraphEdge, BoolExpr> dfwd = decisions.getDataForwarding().get(current);
        Map<GraphEdge, BoolExpr> cfwd = decisions.getControlForwarding().get(current);
        Map<GraphEdge, BoolExpr> across = enc.getMainSlice().getForwardsAcross().get(current);
        // Find the route used
        SymbolicRoute r = decisions.getBestNeighbor().get(current);
        Protocol proto = buildProcotol(r, slice, current);
        Prefix pfx = buildPrefix(r, f);
        // pick the next router
        boolean found = false;
        for (Entry<GraphEdge, BoolExpr> entry : dfwd.entrySet()) {
            GraphEdge ge = entry.getKey();
            BoolExpr dexpr = entry.getValue();
            BoolExpr cexpr = cfwd.get(ge);
            BoolExpr aexpr = across.get(ge);
            String route = buildRoute(pfx, proto, ge);
            if (isTrue(dexpr)) {
                hops.add(buildFlowTraceHop(ge, route));
                if (ge.getPeer() != null && visited.contains(ge.getPeer())) {
                    FlowTrace ft = new FlowTrace(FlowDisposition.LOOP, hops, "LOOP");
                    return new Tuple<>(f, ft);
                }
                if (isFalse(aexpr)) {
                    Interface i = ge.getEnd();
                    IpAccessList acl = i.getIncomingFilter();
                    FilterResult fr = acl.filter(f);
                    String line = "default deny";
                    if (fr.getMatchLine() != null) {
                        line = acl.getLines().get(fr.getMatchLine()).getName();
                    }
                    String note = String.format("DENIED_IN{%s}{%s}", acl.getName(), line);
                    FlowTrace ft = new FlowTrace(FlowDisposition.DENIED_IN, hops, note);
                    return new Tuple<>(f, ft);
                }
                boolean isLoopback = slice.getGraph().isLoopback(ge);
                if (isLoopback) {
                    FlowTrace ft = new FlowTrace(FlowDisposition.ACCEPTED, hops, "ACCEPTED");
                    return new Tuple<>(f, ft);
                }
                if (ge.getPeer() == null) {
                    boolean isBgpPeering = slice.getGraph().getEbgpNeighbors().get(ge) != null;
                    if (isBgpPeering) {
                        FlowTrace ft = new FlowTrace(FlowDisposition.ACCEPTED, hops, "ACCEPTED");
                        return new Tuple<>(f, ft);
                    } else {
                        FlowTrace ft = new FlowTrace(FlowDisposition.NEIGHBOR_UNREACHABLE_OR_EXITS_NETWORK, hops, "NEIGHBOR_UNREACHABLE_OR_EXITS_NETWORK");
                        return new Tuple<>(f, ft);
                    }
                }
                if (slice.getGraph().isHost(ge.getPeer())) {
                    FlowTrace ft = new FlowTrace(FlowDisposition.ACCEPTED, hops, "ACCEPTED");
                    return new Tuple<>(f, ft);
                }
                current = ge.getPeer();
                found = true;
                break;
            } else if (isTrue(cexpr)) {
                hops.add(buildFlowTraceHop(ge, route));
                Interface i = ge.getStart();
                IpAccessList acl = i.getOutgoingFilter();
                FilterResult fr = acl.filter(f);
                IpAccessListLine line = acl.getLines().get(fr.getMatchLine());
                String note = String.format("DENIED_OUT{%s}{%s}", acl.getName(), line.getName());
                FlowTrace ft = new FlowTrace(FlowDisposition.DENIED_OUT, hops, note);
                return new Tuple<>(f, ft);
            }
        }
        if (!found) {
            BoolExpr permitted = r.getPermitted();
            if (boolVal(permitted)) {
                // Check if there is an accepting interface
                for (GraphEdge ge : slice.getGraph().getEdgeMap().get(current)) {
                    Interface i = ge.getStart();
                    Ip ip = i.getAddress().getIp();
                    if (ip.equals(f.getDstIp())) {
                        FlowTrace ft = new FlowTrace(FlowDisposition.ACCEPTED, hops, "ACCEPTED");
                        return new Tuple<>(f, ft);
                    }
                }
                FlowTrace ft = new FlowTrace(FlowDisposition.NEIGHBOR_UNREACHABLE_OR_EXITS_NETWORK, hops, "NEIGHBOR_UNREACHABLE_OR_EXITS_NETWORK");
                return new Tuple<>(f, ft);
            }
            FlowTrace ft = new FlowTrace(FlowDisposition.NO_ROUTE, hops, "NO_ROUTE");
            return new Tuple<>(f, ft);
        }
    }
}

Example 47 with Prefix

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

the class CounterExample method buildEnvRoutingTable.

SortedSet<BgpAdvertisement> buildEnvRoutingTable(Encoder enc) {
    SortedSet<BgpAdvertisement> routes = new TreeSet<>();
    EncoderSlice slice = enc.getMainSlice();
    LogicalGraph lg = slice.getLogicalGraph();
    for (Entry<LogicalEdge, SymbolicRoute> entry : lg.getEnvironmentVars().entrySet()) {
        LogicalEdge lge = entry.getKey();
        SymbolicRoute record = entry.getValue();
        // If there is an external advertisement
        if (boolVal(record.getPermitted())) {
            // If we actually use it
            GraphEdge ge = lge.getEdge();
            String router = ge.getRouter();
            SymbolicDecisions decisions = slice.getSymbolicDecisions();
            BoolExpr ctrFwd = decisions.getControlForwarding().get(router, ge);
            assert ctrFwd != null;
            if (boolVal(ctrFwd)) {
                SymbolicRoute r = decisions.getBestNeighbor().get(router);
                SymbolicPacket pkt = slice.getSymbolicPacket();
                Flow f = buildFlow(pkt, router);
                Prefix pfx = buildPrefix(r, f);
                int pathLength = intVal(r.getMetric());
                // Create dummy information
                BgpNeighbor n = slice.getGraph().getEbgpNeighbors().get(lge.getEdge());
                String srcNode = "as" + n.getRemoteAs();
                Ip zeroIp = new Ip(0);
                Ip dstIp = n.getLocalIp();
                // Recover AS path
                List<SortedSet<Integer>> asSets = new ArrayList<>();
                for (int i = 0; i < pathLength; i++) {
                    SortedSet<Integer> asSet = new TreeSet<>();
                    asSet.add(-1);
                    asSets.add(asSet);
                }
                AsPath path = new AsPath(asSets);
                // Recover communities
                SortedSet<Long> communities = new TreeSet<>();
                for (Entry<CommunityVar, BoolExpr> entry2 : r.getCommunities().entrySet()) {
                    CommunityVar cvar = entry2.getKey();
                    BoolExpr expr = entry2.getValue();
                    if (cvar.getType() == Type.EXACT && boolVal(expr)) {
                        communities.add(cvar.asLong());
                    }
                }
                BgpAdvertisement adv = new BgpAdvertisement(BgpAdvertisementType.EBGP_RECEIVED, pfx, zeroIp, srcNode, "default", zeroIp, router, "default", dstIp, RoutingProtocol.BGP, OriginType.EGP, 100, 80, zeroIp, path, communities, new TreeSet<>(), 0);
                routes.add(adv);
            }
        }
    }
    return routes;
}

Example 48 with Prefix

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

the class CounterExample method buildRoute.

/*
   * Create a route from a graph edge
   */
String buildRoute(EncoderSlice slice, GraphEdge ge) {
    String router = ge.getRouter();
    SymbolicDecisions decisions = slice.getSymbolicDecisions();
    SymbolicRoute r = decisions.getBestNeighbor().get(router);
    SymbolicPacket pkt = slice.getSymbolicPacket();
    Flow f = buildFlow(pkt, router);
    Prefix pfx = buildPrefix(r, f);
    Protocol proto = buildProcotol(r, slice, router);
    return buildRoute(pfx, proto, ge);
}

Example 49 with Prefix

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

the class TransferSSA method aggregateRoutes.

/*
   * Determines whether to model each aggregate route as
   * suppressing a more specific, or including the more specific
   */
private Map<Prefix, Boolean> aggregateRoutes() {
    Map<Prefix, Boolean> acc = new HashMap<>();
    String name = _conf.getName();
    List<GeneratedRoute> aggregates = _enc.getOptimizations().getRelevantAggregates().get(name);
    Set<Prefix> suppressed = _enc.getOptimizations().getSuppressedAggregates().get(name);
    for (GeneratedRoute gr : aggregates) {
        Prefix p = gr.getNetwork();
        acc.put(p, suppressed.contains(p));
    }
    return acc;
}

Example 50 with Prefix

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

the class TransferSSA method computeIntermediatePrefixLen.

/*
   * Create a new variable representing the new prefix length after
   * applying the effect of aggregation.
   */
private void computeIntermediatePrefixLen(TransferParam<SymbolicRoute> param) {
    ArithExpr prefixLen = param.getData().getPrefixLength();
    if (_isExport && _proto.isBgp()) {
        _aggregates = aggregateRoutes();
        if (_aggregates.size() > 0) {
            for (Map.Entry<Prefix, Boolean> entry : _aggregates.entrySet()) {
                Prefix p = entry.getKey();
                Boolean isSuppressed = entry.getValue();
                ArithExpr len = _enc.mkInt(p.getPrefixLength());
                BoolExpr relevantPfx = _enc.isRelevantFor(p, _enc.getSymbolicPacket().getDstIp());
                BoolExpr relevantLen = _enc.mkGt(param.getData().getPrefixLength(), len);
                BoolExpr relevant = _enc.mkAnd(relevantPfx, relevantLen, _enc.mkBool(isSuppressed));
                prefixLen = _enc.mkIf(relevant, len, prefixLen);
            }
            ArithExpr i = createArithVariableWith(param, "PREFIX-LEN", prefixLen);
            param.getData().setPrefixLength(i);
        }
    }
}