1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
/*******************************************************************************
* 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.netobjs;
import java.util.ArrayList;
import java.util.List;
import com.microsoft.z3.BoolExpr;
import com.microsoft.z3.Context;
import com.microsoft.z3.DatatypeExpr;
import com.microsoft.z3.Expr;
import com.microsoft.z3.FuncDecl;
import com.microsoft.z3.IntExpr;
import com.microsoft.z3.Solver;
import com.microsoft.z3.Sort;
import mcnet.components.NetContext;
import mcnet.components.Network;
import mcnet.components.NetworkObject;
/** First example of custom network function: a simple filter
*
*/
public class PolitoNF extends NetworkObject{
List<BoolExpr> constraints;
Context ctx;
DatatypeExpr politoNF;
Network net;
NetContext nctx;
FuncDecl isInBlacklist;
public PolitoNF(Context ctx, Object[]... args) {
super(ctx, args);
}
@Override
protected void init(Context ctx, Object[]... args) {
this.ctx = ctx;
isEndHost=false;
constraints = new ArrayList<BoolExpr>();
z3Node = ((NetworkObject)args[0][0]).getZ3Node();
politoNF = z3Node;
net = (Network)args[0][1];
nctx = (NetContext)args[0][2];
//net.saneSend(this);
}
public void politoNFRules (DatatypeExpr ipA,DatatypeExpr ipB){
// System.out.println("[PolitoNf] Installing rules");
Expr n_0 = ctx.mkConst("politoNF_"+politoNF+"_n_0", nctx.node);
Expr n_1 = ctx.mkConst("politoNF_"+politoNF+"_n_1", nctx.node);
Expr p_0 = ctx.mkConst("politoNF_"+politoNF+"_p_0", nctx.packet);
IntExpr t_0 = ctx.mkIntConst("politoNF_"+politoNF+"_t_0");
IntExpr t_1 = ctx.mkIntConst("politoNF_"+politoNF+"_t_1");
Expr a_0 = ctx.mkConst(politoNF+"_politoNF_a_0", nctx.address);
Expr a_1 = ctx.mkConst(politoNF+"_politoNF_a_1", nctx.address);
FuncDecl myFunction = ctx.mkFuncDecl(politoNF+"_myFunction", new Sort[]{nctx.address,nctx.address}, ctx.mkBoolSort());
BoolExpr myConstraint = ctx.mkForall(new Expr[]{n_0, p_0, t_0},
ctx.mkImplies((BoolExpr)nctx.send.apply(politoNF, n_0, p_0, t_0),
ctx.mkExists(new Expr[]{n_1, t_1},
ctx.mkAnd((BoolExpr)nctx.recv.apply(n_1, politoNF, p_0, t_1),
ctx.mkLt(t_1 , t_0),
(BoolExpr)myFunction.apply(nctx.pf.get("src").apply(p_0), nctx.pf.get("dest").apply(p_0))),1,null,null,null,null)),1,null,null,null,null);
BoolExpr funcConstraint = ctx.mkOr(ctx.mkAnd(ctx.mkEq(a_0, ipA), ctx.mkEq(a_1, ipB)), ctx.mkAnd(ctx.mkEq(a_0,ipB), ctx.mkEq(a_1,ipA)));
// Constraint1 myFunction(a_0,a_1) == ((a_0 == ipA && a_1 == ipB) || (a_0 == ipB && a_1 == ipA))
constraints.add(
ctx.mkForall(new Expr[]{a_0,a_1},
ctx.mkEq(myFunction.apply(a_0, a_1), funcConstraint),1,null,null,null,null));
//Constraint2 send(politoNF, n_0, p, t_0) ->
// (exist n_1,t_1 : (t_1 < t_0 && recv(n_1, politoNF, p, t_1) && myFunction(p.src,p.dest))
constraints.add(myConstraint);
}
@Override
protected void addConstraints(Solver solver) {
BoolExpr[] constr = new BoolExpr[constraints.size()];
solver.add(constraints.toArray(constr));
}
@Override
public DatatypeExpr getZ3Node() {
return politoNF;
}
}
|
