module-middle.cc

ns2中跨层对网路性能优化较复杂

//
// Copyright (c) 2006 Regents of the SIGNET lab, University of Padova.
// 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. Neither the name of the University of Padova (SIGNET lab) nor the 
//    names of its contributors may be used to endorse or promote products 
//    derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 
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//


#include "module-middle.h"
#include "random.h"
#include "modsend-clmsg.h"

extern ClMessage_t SANDBOXMSG;

/* ======================================================================
   TCL Hooks for the simulator
   ====================================================================== */
static class ModuleMiddleClass : public TclClass {
public:
	ModuleMiddleClass() : TclClass("Module/MiddleModule") {}
	TclObject* create(int, const char*const*) {
		return (new ModuleMiddle());
	}
}class_modulemiddle;

ModuleMiddle::ModuleMiddle(): iface_(DEFAULTINTERFACE)
{
}

ModuleMiddle::~ModuleMiddle()
{
}


	// TCL command interpreter
int ModuleMiddle::command(int argc, const char*const* argv)
{
	return Module::command(argc, argv);	
}

int ModuleMiddle::crLayCommand(ClMessage* m)
{
	if (m->type()==SANDBOXMSG)		// Operations to be executed after the reception of a SANDBOXMSG cross layer message
	{
		if(debug_ > 5)
			printf("ModuleMiddle, rx a SANDBOXMSG -> set the interface used to %d\n", ((ClMsgModuleSend *)m)->getIface());
		iface_ = ((ClMsgModuleSend *)m)->getIface();
		delete m;
		return 1;
	}
	// unrecognized cl-msg -> drop it!
	if (debug_ > 5)
		printf("ModuleMiddle, rx an unknown cl-msg -> drop it (type = %i SANDBOXMSG=%i)\n",m->type(),SANDBOXMSG);
	
	//drop(m, "UNKNOWN");
	return Module::crLayCommand(m);
}



void ModuleMiddle::recv(Packet* p)
{
	hdr_cmn *ch = HDR_CMN(p);
	if (ch->direction()==hdr_cmn::UP)
	{
// 		printf("ModuleMiddle, rx a pkt -> send UP\n");
		sendUp(p, 0);
	}
	else
	{
		ch->iface() = iface_;		// set the iface of the packet
		if (debug_>15)
			printf("ModuleMiddle(%d), rx a pkt -> send DOWN to interface %d\n", getId(), iface_);
		sendDown(p, 0);
	}
	
// 	Packet::free(p);
}