classifier-hash.cc

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/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * Copyright (c) 1997 The Regents of the University of California.
 * All rights reserved.
 * 
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 * 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 Network Research
 *      Group at Lawrence Berkeley National Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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#ifndef lint
static const char rcsid[] =
    "@(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/classifier/classifier-hash.cc,v 1.29 2001/12/20 00:15:33 haldar Exp $ (LBL)";
#endif

//
// a generalized classifier for mapping (src/dest/flowid) fields
// to a bucket.  "buckets_" worth of hash table entries are created
// at init time, and other entries in the same bucket are created when
// needed
//
//

extern "C" {
#include <tcl.h>
}

#include <stdlib.h>
#include "config.h"
#include "packet.h"
#include "ip.h"
#include "classifier.h"
#include "classifier-hash.h"

/****************** HashClassifier Methods ************/

int HashClassifier::classify(Packet * p) {
        int slot= lookup(p);
        if (slot >= 0 && slot <=maxslot_)
                return (slot);
        else if (default_ >= 0)
                return (default_);
        return (unknown(p));
} // HashClassifier::classify

int HashClassifier::command(int argc, const char*const* argv)
{
        Tcl& tcl = Tcl::instance();
        /*
         * $classifier set-hash $hashbucket src dst fid $slot
         */

        if (argc == 7) {
                if (strcmp(argv[1], "set-hash") == 0) {
                        //xxx: argv[2] is ignored for now
                        nsaddr_t src = atoi(argv[3]);
                        nsaddr_t dst = atoi(argv[4]);
                        int fid = atoi(argv[5]);
                        int slot = atoi(argv[6]);
                        if (0 > set_hash(src, dst, fid, slot))
                                return TCL_ERROR;
                        return TCL_OK;
                }
        } else if (argc == 6) {
                /* $classifier lookup $hashbuck $src $dst $fid */
                if (strcmp(argv[1], "lookup") == 0) {
                        nsaddr_t src = atoi(argv[3]);
                        nsaddr_t dst = atoi(argv[4]);
                        int fid = atoi(argv[5]);
                        int slot= get_hash(src, dst, fid);
                        if (slot>=0 && slot <=maxslot_) {
                                tcl.resultf("%s", slot_[slot]->name());
                                return (TCL_OK);
                        }
                        tcl.resultf("");
                        return (TCL_OK);
                }
                // Added by Yun Wang to set rate for TBFlow or TSWFlow
                if (strcmp(argv[1], "set-flowrate") == 0) {
                        int fid = atoi(argv[2]);
                        nsaddr_t src = 0;  // only use fid
                        nsaddr_t dst = 0;  // to classify flows
                        int slot = get_hash( src, dst, fid );
                        if ( slot >= 0 && slot <= maxslot_ ) {
                                Flow* f = (Flow*)slot_[slot];
                                tcl.evalf("%u set target_rate_ %s",
                                        f, argv[3]);
                                tcl.evalf("%u set bucket_depth_ %s",
                                        f, argv[4]);
                                tcl.evalf("%u set tbucket_ %s",
                                        f, argv[5]);
                                return (TCL_OK);
                        }
                        else {
                          tcl.evalf("%s set-rate %u %u %u %u %s %s %s",
                          name(), src, dst, fid, slot, argv[3], argv[4],argv[5])
;
                          return (TCL_OK);
                        }
                }  
        } else if (argc == 5) {
                /* $classifier del-hash src dst fid */
                if (strcmp(argv[1], "del-hash") == 0) {
                        nsaddr_t src = atoi(argv[2]);
                        nsaddr_t dst = atoi(argv[3]);
                        int fid = atoi(argv[4]);
                        
                        Tcl_HashEntry *ep= Tcl_FindHashEntry(&ht_, 
                                                             hashkey(src, dst,
                                                                     fid)); 
                        if (ep) {
                                int slot= (int)Tcl_GetHashValue(ep);
                                Tcl_DeleteHashEntry(ep);
                                tcl.resultf("%u", slot);
                                return (TCL_OK);
                        }
                        return (TCL_ERROR);
                }
        }
        return (Classifier::command(argc, argv));
}

/**************  TCL linkage ****************/
static class SrcDestHashClassifierClass : public TclClass {
public:
        SrcDestHashClassifierClass() : TclClass("Classifier/Hash/SrcDest") {}
        TclObject* create(int, const char*const*) {
                return new SrcDestHashClassifier;
        }
} class_hash_srcdest_classifier;

static class FidHashClassifierClass : public TclClass {
public:
        FidHashClassifierClass() : TclClass("Classifier/Hash/Fid") {}
        TclObject* create(int, const char*const*) {
                return new FidHashClassifier;
        }
} class_hash_fid_classifier;

static class DestHashClassifierClass : public TclClass {
public:
        DestHashClassifierClass() : TclClass("Classifier/Hash/Dest") {}
        TclObject* create(int, const char*const*) {
                return new DestHashClassifier;
        }
} class_hash_dest_classifier;

static class SrcDestFidHashClassifierClass : public TclClass {
public:
        SrcDestFidHashClassifierClass() : TclClass("Classifier/Hash/SrcDestFid") {}
        TclObject* create(int, const char*const*) {
                return new SrcDestFidHashClassifier;
        }
} class_hash_srcdestfid_classifier;


// DestHashClassifier methods
int DestHashClassifier::classify(Packet *p)
{
        int slot= lookup(p);
        if (slot >= 0 && slot <=maxslot_)
                return (slot);
        else if (default_ >= 0)
                return (default_);
        return -1;
} // HashClassifier::classify

void DestHashClassifier::do_install(char* dst, NsObject *target) {
        nsaddr_t d = atoi(dst);
        int slot = getnxt(target);
        install(slot, target); 
        if (set_hash(0, d, 0, slot) < 0)
                fprintf(stderr, "DestHashClassifier::set_hash from within DestHashClassifier::do_install returned value < 0");
}

int DestHashClassifier::command(int argc, const char*const* argv)
{
        if (argc == 4) {
                // $classifier install $dst $node
                if (strcmp(argv[1], "install") == 0) {
                        char dst[SMALL_LEN];
                        strcpy(dst, argv[2]);
                        NsObject *node = (NsObject*)TclObject::lookup(argv[3]);
                        //nsaddr_t dst = atoi(argv[2]);
                        do_install(dst, node); 
                        return TCL_OK;
                        //int slot = getnxt(node);
                        //install(slot, node);
                        //if (set_hash(0, dst, 0, slot) >= 0)
                        //return TCL_OK;
                        //else
                        //return TCL_ERROR;
                } // if
        }
        return(HashClassifier::command(argc, argv));
} // command

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