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authorZhipeng (Howard) Huang <huangzhipeng@huawei.com>2017-02-27 13:08:54 +0000
committerGerrit Code Review <gerrit@opnfv.org>2017-02-27 13:08:54 +0000
commit69e33063b3703ae4529b556b63b3c4cc239c3d9a (patch)
treeb30d14715b34f2e4e06928c555c940ddb3365534 /verigraph/service/src/mcnet/components/Network.java
parent280310852bb5e1c7639dedf7ce268e1e66157a51 (diff)
parent53d83244c1bf36af86e90ce5fe758a369f73563e (diff)
Merge "Add verigraph code base"
Diffstat (limited to 'verigraph/service/src/mcnet/components/Network.java')
-rw-r--r--verigraph/service/src/mcnet/components/Network.java296
1 files changed, 296 insertions, 0 deletions
diff --git a/verigraph/service/src/mcnet/components/Network.java b/verigraph/service/src/mcnet/components/Network.java
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+/*******************************************************************************
+ * Copyright (c) 2017 Politecnico di Torino and others.
+ *
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Apache License, Version 2.0
+ * which accompanies this distribution, and is available at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *******************************************************************************/
+
+package mcnet.components;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import com.microsoft.z3.BoolExpr;
+import com.microsoft.z3.Context;
+import com.microsoft.z3.DatatypeExpr;
+import com.microsoft.z3.Expr;
+import com.microsoft.z3.IntExpr;
+import com.microsoft.z3.Solver;
+import com.microsoft.z3.Z3Exception;
+
+/**Model for a network, encompasses routing and wiring
+ *
+ */
+public class Network extends Core{
+
+ Context ctx;
+ NetContext nctx;
+ List<BoolExpr> constraints;
+ List<NetworkObject> elements;
+
+
+
+ public Network(Context ctx,Object[]... args) {
+ super(ctx, args);
+ }
+
+ @Override
+ protected void init(Context ctx, Object[]... args) {
+ this.ctx = ctx;
+ this.nctx = (NetContext) args[0][0];
+ constraints = new ArrayList<BoolExpr>();
+ elements = new ArrayList<NetworkObject>();
+
+ }
+
+ /**Composes the network linking the configured network objects
+ *
+ * @param elements
+ */
+ public void attach (NetworkObject ... elements){
+ for(NetworkObject el : elements)
+ this.elements.add(el);
+ }
+
+ @Override
+ protected void addConstraints(Solver solver) {
+ try {
+ BoolExpr[] constr = new BoolExpr[constraints.size()];
+ solver.add(constraints.toArray(constr));
+ } catch (Z3Exception e) {
+ e.printStackTrace();
+ }
+ }
+
+ /**
+ * Specify host to address mapping.
+ * Handles the case in which we have more than one address for a node
+ * @param addrmap
+ */
+ public void setAddressMappings(ArrayList<Tuple<NetworkObject,ArrayList<DatatypeExpr>>> addrmap){
+ // Set address mapping for nodes.
+ for (Tuple<NetworkObject,ArrayList<DatatypeExpr>> entry : addrmap) {
+ NetworkObject node=entry._1;
+ List<DatatypeExpr> addr=entry._2;
+ Expr a_0 = ctx.mkConst(node+"_address_mapping_a_0",nctx.address);
+ ArrayList<BoolExpr> or_clause = new ArrayList<BoolExpr>();
+
+ // Constraint 1 addrToNode(foreach ad in addr) = node
+ for (DatatypeExpr ad : addr){
+ constraints.add(ctx.mkEq(nctx.addrToNode.apply(ad), node.getZ3Node()));
+ or_clause.add(ctx.mkEq(a_0,ad));
+ }
+ BoolExpr[] orClause = new BoolExpr[or_clause.size()];
+
+ // Constraint 2 nodeHasAddr(node, a_0) == Or(foreach ad in addr (a_0 == ad))
+ // Note we need the iff here to make sure that we set nodeHasAddr to false
+ // for other addresses.
+ constraints.add(ctx.mkForall(new Expr[]{a_0},
+ ctx.mkEq(ctx.mkOr(or_clause.toArray(orClause)), nctx.nodeHasAddr.apply(node.getZ3Node(), a_0)),1,null,null,null,null));
+ }
+ }
+
+
+
+ /**
+ * Don't forward packets addressed to node
+ * @param node
+ */
+ public void saneSend(NetworkObject node){
+ Expr n_0 = ctx.mkConst(node+"_saneSend_n_0", nctx.node);
+ Expr p_0 = ctx.mkConst(node+"_saneSend_p_0", nctx.packet);
+ IntExpr t_0 = ctx.mkIntConst(node+"_saneSend_t_0");
+ // Constant: node
+ //Constraint send(node, n_0, p, t_0) -> !nodeHasAddr(node, p.dest)
+ constraints.add(
+ ctx.mkForall(new Expr[]{n_0, p_0, t_0},
+ ctx.mkImplies((BoolExpr)nctx.send.apply(node.getZ3Node(),n_0, p_0, t_0),
+ ctx.mkNot((BoolExpr)nctx.nodeHasAddr.apply( node.getZ3Node(),
+ nctx.pf.get("dest").apply(p_0)))),1,null,null,null,null));
+ }
+
+ /**
+ * Node sends all traffic through gateway
+ * @param node
+ * @param gateway
+ */
+ public void setGateway (NetworkObject node, NetworkObject gateway){
+ // SetGateway(self, node, gateway): All packets from node are sent through gateway
+ Expr n_0 = ctx.mkConst(node+"_gateway_n_0", nctx.node);
+ Expr p_0 = ctx.mkConst(node+"_gateway_p_0", nctx.packet);
+ IntExpr t_0 = ctx.mkIntConst(node+"_gateway_t_0");
+
+ //Constraint send(node, n_0, p_0, t_0) -> n_0 = gateway
+ constraints.add(
+ ctx.mkForall(new Expr[]{n_0, p_0, t_0},
+ ctx.mkImplies(
+ (BoolExpr)nctx.send.apply(node.getZ3Node(), n_0, p_0, t_0),
+ ctx.mkEq(n_0,gateway.getZ3Node())),1,null,null,null,null));
+
+// constraints.add(ctx.mkForall(new Expr[]{n_0, p_0, t_0},
+// ctx.mkImplies((BoolExpr)nctx.recv.apply(n_0, node.getZ3Node(), p_0, t_0),
+// ctx.mkEq(n_0,gateway.getZ3Node())),1,null,null,null,null));
+ }
+
+ /**
+ * Assigns a specific routing table to a network object. Routing entries in the form: address -> node
+ * @param node
+ * @param routing_table
+ */
+ public void routingTable (NetworkObject node,ArrayList<Tuple<DatatypeExpr,NetworkObject>> routing_table){
+ compositionPolicy(node,routing_table);
+ }
+
+ /**
+ * Composition policies steer packets between middleboxes.
+ * @param node
+ * @param policy
+ */
+ public void compositionPolicy (NetworkObject node,ArrayList<Tuple<DatatypeExpr,NetworkObject>> policy){
+ //Policy is of the form predicate -> node
+ Expr p_0 = ctx.mkConst(node+"_composition_p_0", nctx.packet);
+ Expr n_0 = ctx.mkConst(node+"_composition_n_0", nctx.node);
+ Expr t_0 = ctx.mkIntConst(node+"_composition_t_0");
+
+ HashMap<String,ArrayList<BoolExpr>> collected = new HashMap<String,ArrayList<BoolExpr>>();
+ HashMap<String,NetworkObject> node_dict = new HashMap<String,NetworkObject>();
+ BoolExpr predicates;
+ for(int y=0;y<policy.size();y++){
+ Tuple<DatatypeExpr,NetworkObject> tp = policy.get(y);
+ if(collected.containsKey(""+tp._2)) collected.get(""+tp._2).add(nctx.destAddrPredicate(p_0,tp._1));
+ else{
+ ArrayList<BoolExpr> alb = new ArrayList<BoolExpr>();
+ alb.add(nctx.destAddrPredicate(p_0,tp._1));
+ collected.put(""+tp._2,alb);
+ }
+ node_dict.put(""+tp._2, tp._2);
+ }
+
+ //Constraint foreach rtAddr,rtNode in rt( send(node, n_0, p_0, t_0) &&
+ // Or(foreach rtAddr in rt destAddrPredicate(p_0,rtAddr)) -> n_0 == rtNode )
+ for (Map.Entry<String,ArrayList<BoolExpr>> entry : collected.entrySet()) {
+ BoolExpr[] pred = new BoolExpr[entry.getValue().size()];
+ predicates = ctx.mkOr(entry.getValue().toArray(pred));
+
+ constraints.add(ctx.mkForall(new Expr[]{n_0, p_0, t_0},
+ ctx.mkImplies(ctx.mkAnd((BoolExpr)nctx.send.apply(node.getZ3Node(), n_0, p_0, t_0), predicates),
+ ctx.mkEq(n_0, node_dict.get(entry.getKey()).getZ3Node())),1,null,null,null,null));
+ }
+ }
+
+ /**
+ * Routing entries are in the form: address -> node. Also allows packet to be sent to another box for further processing
+ * @param node
+ * @param routing_table
+ * @param shunt_node
+ */
+ public void routingTableShunt (NetworkObject node,ArrayList<Tuple<DatatypeExpr,NetworkObject>> routing_table,NetworkObject shunt_node){
+ compositionPolicyShunt(node,routing_table,shunt_node);
+ }
+
+ /**
+ * Composition policies steer packets between middleboxes.Policy is in the form: predicate -> node
+ * @param node
+ * @param routing_table
+ * @param shunt_node
+ */
+ public void compositionPolicyShunt (NetworkObject node,ArrayList<Tuple<DatatypeExpr,NetworkObject>> routing_table,NetworkObject shunt_node){
+ Expr p_0 = ctx.mkConst(node+"_composition_p_0", nctx.packet);
+ Expr n_0 = ctx.mkConst(node+"_composition_n_0", nctx.node);
+ Expr t_0 = ctx.mkIntConst(node+"_composition_t_0");
+
+ HashMap<String,ArrayList<BoolExpr>> collected = new HashMap<String,ArrayList<BoolExpr>>();
+ HashMap<String,NetworkObject> node_dict = new HashMap<String,NetworkObject>();
+ BoolExpr predicates;
+ for(int y=0;y<routing_table.size();y++){
+ Tuple<DatatypeExpr,NetworkObject> tp = routing_table.get(y);
+ if(collected.containsKey(""+tp._2)) collected.get(""+tp._2).add(nctx.destAddrPredicate(p_0,tp._1));
+ else{
+ ArrayList<BoolExpr> alb = new ArrayList<BoolExpr>();
+ alb.add(nctx.destAddrPredicate(p_0,tp._1));
+ collected.put(""+tp._2,alb);
+ }
+ node_dict.put(""+tp._2, tp._2);
+ }
+
+ //Constraint foreach rtAddr,rtNode in rt( send(node, n_0, p_0, t_0) &&
+ // Or(foreach rtAddr in rt destAddrPredicate(p_0,rtAddr)) -> n_0 == rtNode )
+ for (Map.Entry<String,ArrayList<BoolExpr>> entry : collected.entrySet()) {
+ BoolExpr[] pred = new BoolExpr[entry.getValue().size()];
+ predicates = ctx.mkOr(entry.getValue().toArray(pred));
+
+ constraints.add(ctx.mkForall(new Expr[]{n_0, p_0, t_0},
+ ctx.mkImplies(ctx.mkAnd((BoolExpr)nctx.send.apply(node.getZ3Node(), n_0, p_0, t_0), predicates),
+ ctx.mkOr(ctx.mkEq(n_0, node_dict.get(entry.getKey()).getZ3Node()),ctx.mkEq(n_0, shunt_node.getZ3Node()))),1,null,null,null,null));
+ }
+
+ }
+
+// public void SimpleIsolation (NetworkObject node, ArrayList<DatatypeExpr> addresses){
+// Expr p = ctx.mkConst(node+"_s_p", nctx.packet);
+// Expr n = ctx.mkConst(node+"_s_n", nctx.node);
+// IntExpr t = ctx.mkInt(node+"_s_t");
+//
+// BoolExpr[] a_pred= new BoolExpr[addresses.size()];
+// for(int y=0;y<addresses.size();y++){
+// DatatypeExpr de = addresses.get(y);
+// a_pred[y] = ctx.mkOr(ctx.mkEq(nctx.pf.get("src").apply(p), de),ctx.mkEq(nctx.pf.get("dest").apply(p), de));
+// }
+//
+// constraints.add(
+// ctx.mkForall(new Expr[]{p, n, t},
+// ctx.mkImplies((BoolExpr)nctx.recv.apply(n, node.getZ3Node(), p, t),
+// ctx.mkOr(a_pred)),1,null,null,null,null));
+// constraints.add(
+// ctx.mkForall(new Expr[]{p, n, t},
+// ctx.mkImplies((BoolExpr)nctx.send.apply(node.getZ3Node(), n, p, t),
+// ctx.mkOr(a_pred)),1,null,null,null,null));
+// }
+
+
+ /**
+ * Set isolation constraints on a node.
+ * Doesn't need to be set but useful when interfering policies are in play.
+ * @param node
+ * @param adjacencies
+ *
+ */
+ public void SetIsolationConstraint ( NetworkObject node, ArrayList<NetworkObject> adjacencies){
+
+ Expr n_0 = ctx.mkConst(node+"_isolation_n_0", nctx.node);
+ Expr p_0 = ctx.mkConst(node+"_isolation_p_0", nctx.packet);
+ IntExpr t_0 = ctx.mkInt(node+"_isolation_t_0");
+
+ BoolExpr[] adj = new BoolExpr[adjacencies.size()];
+ for(int y=0;y<adjacencies.size();y++){
+ NetworkObject no = adjacencies.get(y);
+ adj[y] = ctx.mkEq(n_0,no.getZ3Node());
+ }
+ BoolExpr clause = ctx.mkOr(adj);
+
+ constraints.add(ctx.mkForall(new Expr[]{n_0, p_0, t_0},
+ ctx.mkImplies((BoolExpr)nctx.send.apply(node.getZ3Node(), n_0, p_0, t_0),
+ clause),1,null,null,null,null));
+ constraints.add(ctx.mkForall(new Expr[]{n_0, p_0, t_0},
+ ctx.mkImplies((BoolExpr)nctx.recv.apply(n_0, node.getZ3Node(), p_0, t_0),
+ clause),1,null,null,null,null));
+ }
+
+ /**
+ * Return all currently attached endhosts
+ * @return NetworkObject
+ */
+ public List<String> EndHosts(){
+ List<String> att_nos = new ArrayList<String>();
+ for(NetworkObject el :elements){
+ if(el.isEndHost){
+ System.out.println("el: "+el);
+ att_nos.add(el.getZ3Node().toString());
+ }
+ }
+ return att_nos;
+ }
+}