/* -*-	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.
 * 
 * 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 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.
 * 
 * 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: /nfs/jade/vint/CVSROOT/ns-2/classifier/classifier-hash.cc,v 1.30 2005/09/18 23:33:31 tomh 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) {
				long slot = (long)Tcl_GetHashValue(ep);
				Tcl_DeleteHashEntry(ep);
				tcl.resultf("%lu", 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