tora_io.cc

一个EPI路由协议的实现

/*
 * Modified by Felix Hernandez-Campos ([e-mail])
 * during the porting and extension of Duke's Epidemic Routing  
 * implementation (by Amin Vahdat and David Becker)
 *
 * Fall 2000
 */

/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * Copyright (c) 1997 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 Computer Systems
 *      Engineering Group at Lawrence Berkeley 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.
 */
/* Ported from CMU/Monarch's code*/

/*
  $Id: tora_io.cc,v 1.4 1999/10/13 22:53:11 heideman Exp $
  
  marshall TORA packets 
  */

#include <tora/tora_packet.h>
#include <tora/tora.h>

// --- EPIC ----------------------------------------------------------- [Felix]

//#define DEBUG
//#define SHOWALL

// --- end of EPIC ---------------------------------------------------- [Felix]

/* ======================================================================
   Outgoing Packets
   ====================================================================== */

// --- EPIC ----------------------------------------------------------- [Felix]
// different method signature under Epidemic Routing

// QRY messages in EPIC are in charge of sending the summary vector 
// to node potentially interesting in our packets [Felix]

void
// toraAgent::sendQRY(nsaddr_t id)
toraAgent::sendQRY(nsaddr_t id, Packet *episrc, Time delay = 0.0)

// --- end of EPIC ---------------------------------------------------- [Felix]

{
	Packet *p = Packet::alloc();
	struct hdr_cmn *ch = HDR_CMN(p);
	struct hdr_ip *ih = HDR_IP(p);
	struct hdr_tora_qry *th = HDR_TORA_QRY(p);

	ch->uid() = uidcnt_++;
	ch->ptype() = PT_TORA;
	ch->size() = QRY_HDR_LEN;
	ch->iface() = -2;
	ch->error() = 0;

	// Changed in NS: NS_AF_NONE instead of AF_NONE [Felix]
	ch->addr_type() = NS_AF_NONE;

        ch->prev_hop_ = ipaddr();

	// Changed in NS: using ip.h mutators [Felix]
	ih->saddr() = ipaddr();
	ih->daddr() = IP_BROADCAST;
	ih->sport() = RT_PORT;
	ih->dport() = RT_PORT;

	ih->ttl_ = 1;

	th->tq_type = TORATYPE_QRY;
	th->tq_dst = id;

	// --- EPIC --------------------------------------------------- [Felix]
	// This part of the method has been redefined in Epidemic Routing

#ifdef HASH
	int send=0;
	for(int i=0; i<COPYTABLELEN; ++i) {
		// XXX look at all of bucket
		EPIpkt* ep = copytable[i].lh_first;
		if (ep) {
			struct hdr_epi *eh = HDR_EPI(ep->packet);
			// Using daddr() instead of dst_ [Felix]
			if (eh->copies_allowed 
			    || id==HDR_IP(ep->packet)->daddr()) {
				SUMMSETBIT(th->avail,i);
				send=1;
			}
		}
	}

	if (!send) {
#ifdef SHOWALL
		trace("T %.9f _%d_ nothing avail",
		      Scheduler::instance().clock(), ipaddr());
#endif
		return;
	}

#ifdef SHOWALL
	trace("T %.9f _%d_ avail 0x%x to %d",
	      Scheduler::instance().clock(), ipaddr(), th->avail[0],id);
#endif
#else
	struct hdr_epi *srceh = HDR_EPI(episrc);
	th->epi_id = srceh->id;

#ifdef SHOWALL
	trace("T %.9f _%d_ IHave 0x%x",
	      Scheduler::instance().clock(), ipaddr(), srceh->id);
#endif
#endif

	if (delay==0.0) {
		tora_output(p);
	} else {
		Scheduler::instance().schedule(target_, p, delay);
	}

	// --- end of EPIC -------------------------------------------- [Felix]
}

// --- EPIC ----------------------------------------------------------- [Felix]
// New method signature under Epidemic Routing

// UPD messages in EPIC are in charged of informing a querying node about
// than interests the sending node (always sent after a QRY) [Felix]

//void
//toraAgent::sendUPD(nsaddr_t id)
#ifdef HASH
void
toraAgent::sendUPD(nsaddr_t id, unsigned int summ[])
#else
void
toraAgent::sendUPD(nsaddr_t id, int epi_id)
#endif

// --- end of EPIC ---------------------------------------------------- [Felix]
{
	Packet *p = Packet::alloc();
	struct hdr_cmn *ch = HDR_CMN(p);
	struct hdr_ip *ih = HDR_IP(p);
	struct hdr_tora_upd *th = HDR_TORA_UPD(p);

	ch->uid() = uidcnt_++;
	ch->ptype() = PT_TORA;
	ch->size() = UPD_HDR_LEN;
	ch->iface() = -2;
	ch->error() = 0;

	// Changed in NS: NS_AF_NONE instead of AF_NONE [Felix]
	ch->addr_type() = NS_AF_NONE;

        ch->prev_hop_ = ipaddr();

	// Changed in NS: using ip.h mutators [Felix]
	ih->saddr() = ipaddr();
	ih->daddr() = IP_BROADCAST;
	ih->sport() = RT_PORT;
	ih->dport() = RT_PORT;
	ih->ttl_ = 1;

	th->tu_type = TORATYPE_UPD;
	th->tu_dst = id;

	// --- EPIC --------------------------------------------------- [Felix]
#ifdef HASH
	memcpy(th->iwant,summ,sizeof(th->iwant));
#else
	th->epi_id = epi_id;
#endif
	// --- end of EPIC -------------------------------------------- [Felix]

	tora_output(p);
}


void
toraAgent::sendCLR(nsaddr_t id, double tau, nsaddr_t oid)
{
	Packet *p = Packet::alloc();
	struct hdr_cmn *ch = HDR_CMN(p);
	struct hdr_ip *ih = HDR_IP(p);
	struct hdr_tora_clr *th = HDR_TORA_CLR(p);

	ch->uid() = uidcnt_++;
	ch->ptype() = PT_TORA;
	ch->size() = CLR_HDR_LEN;
	ch->iface() = -2;
	ch->error() = 0;

	// Changed in NS: NS_AF_NONE instead of AF_NONE [Felix]
	ch->addr_type() = NS_AF_NONE;

        ch->prev_hop_ = ipaddr();

	// Changed in NS: using ip.h accessors [Felix]
	ih->saddr() = ipaddr();
	
	// --- EPIC --------------------------------------------------- [Felix]
	// Using ip.h accessors [Felix]
	ih->daddr() = id; // IP_BROADCAST;
	// --- end of EPIC -------------------------------------------- [Felix]

	ih->sport() = RT_PORT;
	ih->dport() = RT_PORT;
	ih->ttl_ = 1;

	th->tc_type = TORATYPE_CLR;
	th->tc_dst = id;
	th->tc_tau = tau;
	th->tc_oid = oid;

	tora_output(p);
}

void
toraAgent::tora_output(Packet *p)
{
	target_->recv(p, (Handler*) 0);
}