salink.cc

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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: /nfs/jade/vint/CVSROOT/ns-2/adc/salink.cc,v 1.6 2005/08/26 05:05:28 tomh Exp $
 */

#include "packet.h"
#include "ip.h"
#include "resv.h"
#include "connector.h"
#include "adc.h"
#include "salink.h"

static class SALinkClass : public TclClass {
public:
    SALinkClass() : TclClass("SALink") {}
    TclObject* create(int, const char*const*) {
        return (new SALink());
    }
}class_salink;

SALink::SALink() : adc_(0), numfl_(-1), tchan_(0), onumfl_(0), last_(-1)
{
    int i;
    for (i=0;i<NFLOWS;i++) {
        pending_[i].flowid=-1;
        pending_[i].status=0;
    }
    bind("src_", &src_);
    bind("dst_", &dst_);

    numfl_.tracer(this);
    numfl_.name("\"Admitted Flows\"");
}


void SALink::recv(Packet *p, Handler *h)
{
    int decide;
    int j;
    
    hdr_cmn *ch=hdr_cmn::access(p);
    hdr_ip *iph=hdr_ip::access(p);
    hdr_resv *rv=hdr_resv::access(p);
    
    //CLEAN THIS UP
    int cl=(iph->flowid())?1:0;
    
    switch(ch->ptype()) {
    case PT_REQUEST:
        decide=adc_->admit_flow(cl,rv->rate(),rv->bucket());
        if (tchan_)
            if (last_ != decide) {
                int n;
                char wrk[50];
                double t = Scheduler::instance().clock();
                sprintf(wrk, "l -t %g -s %d -d %d -S COLOR -c %s", 
                    t, src_, dst_, decide ? "MediumBlue" : "red" );
                n = strlen(wrk);
                wrk[n] = '\n';
                wrk[n+1] = 0;
                (void)Tcl_Write(tchan_, wrk, n+1);
                last_ = decide;
            }
        //put decide in the packet
        rv->decision() &= decide;
        if (decide) {
            j=get_nxt();
            pending_[j].flowid=iph->flowid();
            //pending_[j].status=decide;
            numfl_++;
        }
        break;
    case PT_ACCEPT:
    case PT_REJECT:
        break;
    case PT_CONFIRM:
        {
            j=lookup(iph->flowid());
            if (j!=-1) {
                if (!rv->decision()) {
                    //decrease the avload for this class 
                    adc_->rej_action(cl,rv->rate(),rv->bucket());
                    numfl_--;
                }
                pending_[j].flowid=-1;
            }
            break;
        }
    case PT_TEARDOWN:
        {
            adc_->teardown_action(cl,rv->rate(),rv->bucket());
            numfl_--;
            break;
        }
    default:
#ifdef notdef
        error("unknown signalling message type : %d",ch->ptype());
        abort();
#endif
        break;
    }
    send(p,h);
}

int SALink::command(int argc, const char*const* argv)
{
    Tcl& tcl = Tcl::instance();
    char wrk[500];
    
    if (argc ==3) {
        if (strcmp(argv[1],"attach-adc") == 0 ) {
            adc_=(ADC *)TclObject::lookup(argv[2]);
            if (adc_ ==0 ) {
                tcl.resultf("no such node %s", argv[2]);
                return(TCL_ERROR);
            }
            return(TCL_OK);
        }
        if (strcmp(argv[1], "attach") == 0) {
            int mode;
            const char* id = argv[2];
            tchan_ = Tcl_GetChannel(tcl.interp(), (char*)id, &mode);
            if (tchan_ == 0) {
                tcl.resultf("SALink: trace: can't attach %s for writing", id);
                return (TCL_ERROR);
            }
            return (TCL_OK);
        }
    }
    if (argc == 2) {
        if (strcmp(argv[1], "add-trace") == 0) {
            if (tchan_) {
                sprintf(wrk, "a -t * -n %s:%d-%d -s %d",
                    adc_->type(), src_, dst_, src_);
                int n = strlen(wrk);
                wrk[n] = '\n';
                wrk[n+1] = 0;
                (void)Tcl_Write(tchan_, wrk, n+1);
                numfl_ = 0;
            }
            return (TCL_OK);
        }
    }
    return Connector::command(argc,argv);
}

int SALink::lookup(int flowid)
{
    int i;
    for (i=0;i<NFLOWS;i++)
        if (pending_[i].flowid==flowid)
            return i;
    return(-1);
}

int SALink::get_nxt()
{
    int i;
    for (i=0;i<NFLOWS;i++)
        {
            if (pending_[i].flowid==-1)
                return i;
        }
    printf("Ran out of pending space \n");
    exit(1);
    return i;
}

void SALink::trace(TracedVar* v)
{

    char wrk[500];
    int *p, newval;

    if (strcmp(v->name(), "\"Admitted Flows\"") == 0) {
        p = &onumfl_;
    }
    else {
        fprintf(stderr, "SALink: unknown trace var %s\n", v->name());
        return;
    }

    newval = int(*((TracedInt*)v));

    if (tchan_) {
        int n;
        double t = Scheduler::instance().clock();
        /* f -t 0.0 -s 1 -a SA -T v -n Num -v 0 -o 0 */
        sprintf(wrk, "f -t %g -s %d -a %s:%d-%d -T v -n %s -v %d -o %d",
            t, src_, adc_->type(), src_, dst_, v->name(), newval, *p);
        n = strlen(wrk);
        wrk[n] = '\n';
        wrk[n+1] = 0;
        (void)Tcl_Write(tchan_, wrk, n+1);
        
    }

    *p = newval;

    return;
}

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