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/*
* Encapsulator.cc
* Copyright (C) 2000 by the University of Southern California
* $Id: Encapsulator.cc,v 1.6 2005/08/25 18:58:02 johnh Exp $
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
*
* The copyright of this module includes the following
* linking-with-specific-other-licenses addition:
*
* In addition, as a special exception, the copyright holders of
* this module give you permission to combine (via static or
* dynamic linking) this module with free software programs or
* libraries that are released under the GNU LGPL and with code
* included in the standard release of ns-2 under the Apache 2.0
* license or under otherwise-compatible licenses with advertising
* requirements (or modified versions of such code, with unchanged
* license). You may copy and distribute such a system following the
* terms of the GNU GPL for this module and the licenses of the
* other code concerned, provided that you include the source code of
* that other code when and as the GNU GPL requires distribution of
* source code.
*
* Note that people who make modified versions of this module
* are not obligated to grant this special exception for their
* modified versions; it is their choice whether to do so. The GNU
* General Public License gives permission to release a modified
* version without this exception; this exception also makes it
* possible to release a modified version which carries forward this
* exception.
*
*/
//
// $Header: /cvsroot/nsnam/ns-2/common/Encapsulator.cc,v 1.6 2005/08/25 18:58:02 johnh Exp $
#include "packet.h"
#include "ip.h"
#include "Encapsulator.h"
#include "encap.h"
static class EncapsulatorClass : public TclClass {
public:
EncapsulatorClass() : TclClass("Agent/Encapsulator") {}
TclObject* create(int, const char*const*) {
return (new Encapsulator());
}
} class_encapsulator;
Encapsulator::Encapsulator() :
Agent(PT_ENCAPSULATED),
d_target_(0)
{
bind("status_", &status_);
bind("overhead_", &overhead_);
}
int Encapsulator::command(int argc, const char*const* argv)
{
Tcl& tcl = Tcl::instance();
if (argc == 2) {
if (strcmp(argv[1], "decap-target") == 0) {
if (d_target_ != 0) tcl.result(d_target_->name());
return (TCL_OK);
}
}
else if (argc == 3) {
if (strcmp(argv[1], "decap-target") == 0) {
d_target_ = (NsObject*)TclObject::lookup(argv[2]);
// even if it's zero, it's OK, we'll just not send to such
// a target then.
return (TCL_OK);
}
}
return (Agent::command(argc, argv));
}
void Encapsulator::recv(Packet* p, Handler* h)
{
if (d_target_) {
Packet *copy_p= p->copy();
d_target_->recv(copy_p, h);
}
if (status_) {
Packet* ep= allocpkt(); //sizeof(Packet*));
hdr_encap* eh= hdr_encap::access(ep);
eh->encap(p);
//Packet** pp= (Packet**) encap_p->accessdata();
//*pp= p;
hdr_cmn* ch_e= hdr_cmn::access(ep);
hdr_cmn* ch_p= hdr_cmn::access(p);
ch_e->ptype()= PT_ENCAPSULATED;
ch_e->size()= ch_p->size() + overhead_;
ch_e->timestamp()= ch_p->timestamp();
send(ep, h);
}
else send(p, h); //forward the packet as it is
}
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