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/* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
* Copyright (c) Xerox Corporation 1997. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* 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.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linking this file statically or dynamically with other modules is making
* a combined work based on this file. Thus, the terms and conditions of
* the GNU General Public License cover the whole combination.
*
* In addition, as a special exception, the copyright holders of this file
* give you permission to combine this file 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
* file 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 file 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/tcp/saack.cc,v 1.8 2005/08/26 05:05:30 tomh Exp $
*/
//SignalAckClass
//Null receiver agent which merely acknowledges a request
#include "agent.h"
#include "ip.h"
#include "resv.h"
class SAack_Agent : public Agent {
public:
SAack_Agent();
protected:
void recv(Packet *, Handler *);
int command(int,const char* const*);
};
SAack_Agent::SAack_Agent(): Agent(PT_TCP)
{
}
static class SAackClass : public TclClass {
public:
SAackClass() : TclClass("Agent/SAack") {}
TclObject* create(int, const char*const*) {
return (new SAack_Agent());
}
} class_saack;
void SAack_Agent::recv(Packet *p, Handler *h)
{
hdr_cmn *ch = hdr_cmn::access(p);
if (ch->ptype() == PT_REQUEST) {
Packet *newp =allocpkt();
hdr_cmn *newch=hdr_cmn::access(newp);
newch->size()=ch->size();
// turn the packet around by swapping src and dst
hdr_ip * iph = hdr_ip::access(p);
hdr_ip * newiph = hdr_ip::access(newp);
newiph->dst()=iph->src();
newiph->flowid()=iph->flowid();
newiph->prio()=iph->prio();
hdr_resv* rv=hdr_resv::access(p);
hdr_resv* newrv=hdr_resv::access(newp);
newrv->decision()=rv->decision();
newrv->rate()=rv->rate();
newrv->bucket()=rv->bucket();
if (rv->decision())
newch->ptype() = PT_ACCEPT;
else
newch->ptype() = PT_REJECT;
target_->recv(newp);
Packet::free(p);
return;
}
Agent::recv(p,h);
}
int SAack_Agent::command(int argc, const char*const* argv)
{
return (Agent::command(argc,argv));
}
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