checkpaint.cc

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

/*
 * checkpaint.{cc,hh} -- element checks paint annotation
 * Eddie Kohler, Robert Morris
 *
 * Copyright (c) 1999-2000 Massachusetts Institute of Technology
 * Copyright (c) 2008 Meraki, Inc.
 *
 * 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 "checkpaint.hh"
#include <click/confparse.hh>
#include <click/error.hh>
#include <click/packet_anno.hh>
CLICK_DECLS

CheckPaint::CheckPaint()
{
}

CheckPaint::~CheckPaint()
{
}

int
CheckPaint::configure(Vector<String> &conf, ErrorHandler *errh)
{
    int anno = PAINT_ANNO_OFFSET;
    if (cp_va_kparse(conf, this, errh,
		     "COLOR", cpkP+cpkM, cpByte, &_color,
		     "ANNO", cpkP, cpAnno, 1, &anno,
		     cpEnd) < 0)
	return -1;
    _anno = anno;
    return 0;
}

void
CheckPaint::push(int, Packet *p)
{
    if (p->anno_u8(_anno) != _color)
	checked_output_push(1, p);
    else
	output(0).push(p);
}

Packet *
CheckPaint::pull(int)
{
    Packet *p = input(0).pull();
    if (p && p->anno_u8(_anno) != _color) {
	checked_output_push(1, p);
	p = 0;
    }
    return p;
}

void
CheckPaint::add_handlers()
{
    add_data_handlers("color", Handler::OP_READ | Handler::OP_WRITE, &_color);
}

CLICK_ENDDECLS
EXPORT_ELEMENT(CheckPaint)