suppressor.cc

Click is a modular router toolkit. To use it you ll need to know how to compile and install the sof

/*
 * suppressor.{cc,hh} -- element for Ethernet switch
 * John Jannotti
 *
 * Copyright (c) 1999-2000 Massachusetts Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, subject to the conditions
 * listed in the Click LICENSE file. These conditions include: you must
 * preserve this copyright notice, and you cannot mention the copyright
 * holders in advertising related to the Software without their permission.
 * The Software is provided WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED. This
 * notice is a summary of the Click LICENSE file; the license in that file is
 * legally binding.
 */

#include <click/config.h>
#include "suppressor.hh"
#include <click/bitvector.hh>
#include <click/confparse.hh>
#include <click/error.hh>
CLICK_DECLS

Suppressor::Suppressor()
{
}

Suppressor::~Suppressor()
{
}

int
Suppressor::configure(Vector<String> &, ErrorHandler *)
{
    _suppressed.assign(noutputs(), false);
    return 0;
}

void
Suppressor::push(int source, Packet *p)
{
    if (suppressed(source))
	p->kill();
    else			// forward
	output(source).push(p);
}

Packet *
Suppressor::pull(int source)
{
    if (suppressed(source))
	return 0;
    else
	return input(source).pull();
}

static String
read_active(Element *e, void *thunk)
{
    Suppressor *sup = static_cast<Suppressor *>(e);
    int port = (int) reinterpret_cast<intptr_t>(thunk);
    return (sup->suppressed(port) ? "false" : "true");
}

static int
write_active(const String &s, Element *e, void *thunk, ErrorHandler *errh)
{
    Suppressor *sup = static_cast<Suppressor *>(e);
    int port = (int) reinterpret_cast<intptr_t>(thunk);
    bool active;
    if (!cp_bool(s, &active))
	return errh->error("active value must be boolean");
    else {
	sup->set(port, !active);
	return 0;
    }
}

static int
write_reset(const String &, Element *e, void *, ErrorHandler *)
{
    Suppressor *sup = static_cast<Suppressor *>(e);
    sup->allow_all();
    return 0;
}

void
Suppressor::add_handlers()
{
    for (int i = 0; i < ninputs(); i++) {
	String s = "active" + String(i);
	add_read_handler(s, read_active, i, Handler::CHECKBOX);
	add_write_handler(s, write_active, i);
    }
    add_write_handler("reset", write_reset, 0, Handler::BUTTON);
}

CLICK_ENDDECLS
EXPORT_ELEMENT(Suppressor)