use of org.batfish.datamodel.routing_policy.statement.SetOspfMetricType in project batfish by batfish.
the class TransferSSA method compute.
/*
* Convert a list of statements into a Z3 boolean expression for the transfer function.
*/
private TransferResult<BoolExpr, BoolExpr> compute(List<Statement> statements, TransferParam<SymbolicRoute> p, TransferResult<BoolExpr, BoolExpr> result) {
boolean doesReturn = false;
for (Statement stmt : statements) {
if (stmt instanceof StaticStatement) {
StaticStatement ss = (StaticStatement) stmt;
switch(ss.getType()) {
case ExitAccept:
doesReturn = true;
p.debug("ExitAccept");
result = returnValue(p, result, true);
break;
case ReturnTrue:
doesReturn = true;
p.debug("ReturnTrue");
result = returnValue(p, result, true);
break;
case ExitReject:
doesReturn = true;
p.debug("ExitReject");
result = returnValue(p, result, false);
break;
case ReturnFalse:
doesReturn = true;
p.debug("ReturnFalse");
result = returnValue(p, result, false);
break;
case SetDefaultActionAccept:
p.debug("SetDefaulActionAccept");
p = p.setDefaultAccept(true);
break;
case SetDefaultActionReject:
p.debug("SetDefaultActionReject");
p = p.setDefaultAccept(false);
break;
case SetLocalDefaultActionAccept:
p.debug("SetLocalDefaultActionAccept");
p = p.setDefaultAcceptLocal(true);
break;
case SetLocalDefaultActionReject:
p.debug("SetLocalDefaultActionReject");
p = p.setDefaultAcceptLocal(false);
break;
case ReturnLocalDefaultAction:
p.debug("ReturnLocalDefaultAction");
// TODO: need to set local default action in an environment
if (p.getDefaultAcceptLocal()) {
result = returnValue(p, result, true);
} else {
result = returnValue(p, result, false);
}
break;
case FallThrough:
p.debug("Fallthrough");
result = fallthrough(p, result);
break;
case Return:
// TODO: assumming this happens at the end of the function, so it is ignored for now.
p.debug("Return");
break;
case RemovePrivateAs:
p.debug("RemovePrivateAs");
System.out.println("Warning: use of unimplemented feature RemovePrivateAs");
break;
default:
throw new BatfishException("TODO: computeTransferFunction: " + ss.getType());
}
} else if (stmt instanceof If) {
p.debug("If");
If i = (If) stmt;
TransferResult<BoolExpr, BoolExpr> r = compute(i.getGuard(), p);
result = result.addChangedVariables(r);
BoolExpr guard = (BoolExpr) r.getReturnValue().simplify();
String str = guard.toString();
// If there are updates in the guard, add them to the parameter p before entering branches
for (Pair<String, Expr> changed : r.getChangedVariables()) {
p.debug("CHANGED: " + changed.getFirst());
updateSingleValue(p, changed.getFirst(), changed.getSecond());
}
p.debug("guard: " + str);
// If we know the branch ahead of time, then specialize
switch(str) {
case "true":
p.debug("True Branch");
result = compute(i.getTrueStatements(), p.indent(), result);
break;
case "false":
p.debug("False Branch");
compute(i.getFalseStatements(), p.indent(), result);
break;
default:
p.debug("True Branch");
// clear changed variables before proceeding
TransferParam<SymbolicRoute> p1 = p.indent().setData(p.getData().copy());
TransferParam<SymbolicRoute> p2 = p.indent().setData(p.getData().copy());
TransferResult<BoolExpr, BoolExpr> trueBranch = compute(i.getTrueStatements(), p1, initialResult());
p.debug("False Branch");
TransferResult<BoolExpr, BoolExpr> falseBranch = compute(i.getFalseStatements(), p2, initialResult());
p.debug("JOIN");
PList<Pair<String, Pair<Expr, Expr>>> pairs = trueBranch.mergeChangedVariables(falseBranch);
// Extract and deal with the return value first so that other
// variables have this reflected in their value
int idx = pairs.find(pair -> pair.getFirst().equals("RETURN"));
if (idx >= 0) {
Pair<String, Pair<Expr, Expr>> ret = pairs.get(idx);
pairs = pairs.minus(idx);
pairs = pairs.plus(pairs.size(), ret);
}
for (Pair<String, Pair<Expr, Expr>> pair : pairs) {
String s = pair.getFirst();
p.debug("CHANGED: " + s);
Pair<Expr, Expr> x = joinPoint(p, result, guard, pair);
result = result.addChangedVariable(s, x.getFirst());
if (s.equals("RETURN")) {
result = result.setReturnValue((BoolExpr) x.getFirst()).setReturnAssignedValue((BoolExpr) x.getSecond());
}
if (s.equals("FALLTHROUGH")) {
result = result.setFallthroughValue((BoolExpr) x.getFirst()).setReturnAssignedValue((BoolExpr) x.getSecond());
}
}
break;
}
} else if (stmt instanceof SetDefaultPolicy) {
p.debug("SetDefaultPolicy");
p = p.setDefaultPolicy((SetDefaultPolicy) stmt);
} else if (stmt instanceof SetMetric) {
p.debug("SetMetric");
// TODO: what is the semantics for BGP? Is this MED?
if (!_current.getProto().isBgp()) {
SetMetric sm = (SetMetric) stmt;
LongExpr ie = sm.getMetric();
ArithExpr newValue = applyLongExprModification(p.getData().getMetric(), ie);
newValue = _enc.mkIf(result.getReturnAssignedValue(), p.getData().getMetric(), newValue);
ArithExpr x = createArithVariableWith(p, "METRIC", newValue);
p.getData().setMetric(x);
result = result.addChangedVariable("METRIC", x);
}
} else if (stmt instanceof SetOspfMetricType) {
p.debug("SetOspfMetricType");
SetOspfMetricType somt = (SetOspfMetricType) stmt;
OspfMetricType mt = somt.getMetricType();
SymbolicOspfType t;
if (mt == OspfMetricType.E1) {
t = new SymbolicOspfType(_enc, OspfType.E1);
} else {
t = new SymbolicOspfType(_enc, OspfType.E2);
}
BitVecExpr newValue = t.getBitVec();
newValue = _enc.mkIf(result.getReturnAssignedValue(), p.getData().getOspfType().getBitVec(), newValue);
BitVecExpr x = createBitVecVariableWith(p, "OSPF-TYPE", 2, newValue);
p.getData().getOspfType().setBitVec(x);
result = result.addChangedVariable("OSPF-TYPE", x);
} else if (stmt instanceof SetLocalPreference) {
p.debug("SetLocalPreference");
SetLocalPreference slp = (SetLocalPreference) stmt;
IntExpr ie = slp.getLocalPreference();
ArithExpr newValue = applyIntExprModification(p.getData().getLocalPref(), ie);
newValue = _enc.mkIf(result.getReturnAssignedValue(), p.getData().getLocalPref(), newValue);
ArithExpr x = createArithVariableWith(p, "LOCAL-PREF", newValue);
p.getData().setLocalPref(x);
result = result.addChangedVariable("LOCAL-PREF", x);
} else if (stmt instanceof AddCommunity) {
p.debug("AddCommunity");
AddCommunity ac = (AddCommunity) stmt;
Set<CommunityVar> comms = _enc.getGraph().findAllCommunities(_conf, ac.getExpr());
for (CommunityVar cvar : comms) {
BoolExpr newValue = _enc.mkIf(result.getReturnAssignedValue(), p.getData().getCommunities().get(cvar), _enc.mkTrue());
BoolExpr x = createBoolVariableWith(p, cvar.getValue(), newValue);
p.getData().getCommunities().put(cvar, x);
result = result.addChangedVariable(cvar.getValue(), x);
}
} else if (stmt instanceof SetCommunity) {
p.debug("SetCommunity");
SetCommunity sc = (SetCommunity) stmt;
Set<CommunityVar> comms = _enc.getGraph().findAllCommunities(_conf, sc.getExpr());
for (CommunityVar cvar : comms) {
BoolExpr newValue = _enc.mkIf(result.getReturnAssignedValue(), p.getData().getCommunities().get(cvar), _enc.mkTrue());
BoolExpr x = createBoolVariableWith(p, cvar.getValue(), newValue);
p.getData().getCommunities().put(cvar, x);
result = result.addChangedVariable(cvar.getValue(), x);
}
} else if (stmt instanceof DeleteCommunity) {
p.debug("DeleteCommunity");
DeleteCommunity ac = (DeleteCommunity) stmt;
Set<CommunityVar> comms = _enc.getGraph().findAllCommunities(_conf, ac.getExpr());
Set<CommunityVar> toDelete = new HashSet<>();
// Find comms to delete
for (CommunityVar cvar : comms) {
if (cvar.getType() == Type.REGEX) {
toDelete.addAll(_enc.getCommunityDependencies().get(cvar));
} else {
toDelete.add(cvar);
}
}
// Delete each community
for (CommunityVar cvar : toDelete) {
BoolExpr newValue = _enc.mkIf(result.getReturnAssignedValue(), p.getData().getCommunities().get(cvar), _enc.mkFalse());
BoolExpr x = createBoolVariableWith(p, cvar.getValue(), newValue);
p.getData().getCommunities().put(cvar, x);
result = result.addChangedVariable(cvar.getValue(), x);
}
} else if (stmt instanceof RetainCommunity) {
p.debug("RetainCommunity");
// no op
} else if (stmt instanceof PrependAsPath) {
p.debug("PrependAsPath");
PrependAsPath pap = (PrependAsPath) stmt;
Integer prependCost = prependLength(pap.getExpr());
ArithExpr newValue = _enc.mkSum(p.getData().getMetric(), _enc.mkInt(prependCost));
newValue = _enc.mkIf(result.getReturnAssignedValue(), p.getData().getMetric(), newValue);
ArithExpr x = createArithVariableWith(p, "METRIC", newValue);
p.getData().setMetric(x);
result = result.addChangedVariable("METRIC", x);
} else if (stmt instanceof SetOrigin) {
p.debug("SetOrigin");
System.out.println("Warning: use of unimplemented feature SetOrigin");
} else if (stmt instanceof SetNextHop) {
p.debug("SetNextHop");
System.out.println("Warning: use of unimplemented feature SetNextHop");
} else {
String s = (_isExport ? "export" : "import");
String msg = String.format("Unimplemented feature %s for %s transfer function on interface %s", stmt.toString(), s, _graphEdge.toString());
throw new BatfishException(msg);
}
}
// If this is the outermost call, then we relate the variables
if (p.getInitialCall()) {
p.debug("InitialCall finalizing");
// Apply the default action
if (!doesReturn) {
p.debug("Applying default action: " + p.getDefaultAccept());
if (p.getDefaultAccept()) {
result = returnValue(p, result, true);
} else {
result = returnValue(p, result, false);
}
}
BoolExpr related = relateVariables(p, result);
BoolExpr retValue = _enc.mkIf(result.getReturnValue(), related, _enc.mkNot(_current.getPermitted()));
result = result.setReturnValue(retValue);
}
return result;
}
use of org.batfish.datamodel.routing_policy.statement.SetOspfMetricType in project batfish by batfish.
the class OspfTest method getExportPolicyStatements.
private static List<Statement> getExportPolicyStatements(InterfaceAddress address) {
long externalOspfMetric = 20L;
If exportIfMatchL2Prefix = new If();
exportIfMatchL2Prefix.setGuard(new MatchPrefixSet(new DestinationNetwork(), new ExplicitPrefixSet(new PrefixSpace(ImmutableSet.of(PrefixRange.fromPrefix(address.getPrefix()))))));
exportIfMatchL2Prefix.setTrueStatements(ImmutableList.of(new SetOspfMetricType(OspfMetricType.E1), new SetMetric(new LiteralLong(externalOspfMetric)), Statements.ExitAccept.toStaticStatement()));
exportIfMatchL2Prefix.setFalseStatements(ImmutableList.of(Statements.ExitReject.toStaticStatement()));
return ImmutableList.of(exportIfMatchL2Prefix);
}
Aggregations