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/* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
* Copyright (c) 1996-1997 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the MASH Research
* Group at the University of California Berkeley.
* 4. Neither the name of the University nor of the Research Group may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /cvsroot/nsnam/ns-2/classifier/classifier-virtual.cc,v 1.14 2010/03/08 05:54:49 tom_henderson Exp $";
#endif
extern "C" {
#include <tcl.h>
}
#include "config.h"
#include "packet.h"
#include "ip.h"
#include "classifier.h"
#include "route.h"
#include "object.h"
#include "address.h"
class VirtualClassifier : public Classifier {
public:
VirtualClassifier() : routelogic_(0) {
Tcl_InitHashTable(&ht_, TCL_ONE_WORD_KEYS);
}
~VirtualClassifier() {
Tcl_DeleteHashTable(&ht_);
}
//virtual void do_install(char *dst, NsObject *target) { }
virtual void do_install(char *, NsObject *) { }
protected:
NsObject* next_;
Tcl_HashTable ht_;
RouteLogic *routelogic_;
NsObject* target_;
bool enableHrouting_;
char nodeaddr_[SMALL_LEN];
int classify(Packet *const p) {
hdr_ip* iph = hdr_ip::access(p);
return mshift(iph->daddr());
}
void recv(Packet* p, Handler* h) {
if (!routelogic_) {
Tcl &tcl = Tcl::instance();
tcl.evalc("[Simulator instance] get-routelogic");
routelogic_= (RouteLogic*) TclObject::lookup(tcl.result());
//tcl.evalf("%s info class", tcl.result());
}
/* first we find the next hop by asking routelogic
* then we use a hash next_hop -> target_object
* thus, the size of the table is at most N-1
*/
Tcl &tcl = Tcl::instance();
hdr_ip* iph = hdr_ip::access(p);
char* adst= Address::instance().print_nodeaddr(iph->daddr());
//adst[strlen(adst)-1]= 0;
target_= 0;
int next_hopIP;
routelogic_->lookup_flat(nodeaddr_, adst, next_hopIP);
delete [] adst;
int newEntry;
long key = next_hopIP;
Tcl_HashEntry *ep= Tcl_CreateHashEntry(&ht_, (const char*)key,
&newEntry);
if (newEntry) {
tcl.evalf("%s find %d", name(), next_hopIP);
Tcl_SetHashValue(ep, target_= (NsObject*)tcl.lookup(tcl.result()));
} else {
target_= (NsObject*)Tcl_GetHashValue(ep);
}
if (!target_) {
/*
* XXX this should be "dropped" somehow. Right now,
* these events aren't traced.
*/
Packet::free(p);
return;
}
target_->recv(p,h);
}
int command(int argc, const char*const* argv) {
if (argc == 3) {
if (strcmp(argv[1], "nodeaddr") == 0) {
strcpy(nodeaddr_, argv[2]);
return(TCL_OK);
}
}
return (NsObject::command(argc, argv));
}
};
static class VirtualClassifierClass : public TclClass {
public:
VirtualClassifierClass() : TclClass("Classifier/Virtual") {}
TclObject* create(int, const char*const*) {
return (new VirtualClassifier());
}
} class_virtual_classifier;
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