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/*
* EIGRP Metric Math Functions.
* Copyright (C) 2013-2016
* Authors:
* Donnie Savage
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include "eigrpd/eigrp_structs.h"
#include "eigrpd/eigrpd.h"
#include "eigrpd/eigrp_types.h"
#include "eigrpd/eigrp_metric.h"
eigrp_scaled_t eigrp_bandwidth_to_scaled(eigrp_bandwidth_t bandwidth)
{
eigrp_bandwidth_t scaled = EIGRP_BANDWIDTH_MAX;
if (bandwidth != EIGRP_BANDWIDTH_MAX) {
scaled = (EIGRP_CLASSIC_SCALER * EIGRP_BANDWIDTH_SCALER);
scaled = scaled / bandwidth;
scaled = scaled ? scaled : EIGRP_BANDWIDTH_MIN;
}
scaled = (scaled < EIGRP_METRIC_MAX) ? scaled : EIGRP_METRIC_MAX;
return (eigrp_scaled_t)scaled;
}
eigrp_bandwidth_t eigrp_scaled_to_bandwidth(eigrp_scaled_t scaled)
{
eigrp_bandwidth_t bandwidth = EIGRP_BANDWIDTH_MAX;
if (scaled != EIGRP_CLASSIC_MAX) {
bandwidth = (EIGRP_CLASSIC_SCALER * EIGRP_BANDWIDTH_SCALER);
bandwidth = scaled * bandwidth;
bandwidth = (bandwidth < EIGRP_METRIC_MAX)
? bandwidth
: EIGRP_BANDWIDTH_MAX;
}
return bandwidth;
}
eigrp_scaled_t eigrp_delay_to_scaled(eigrp_delay_t delay)
{
delay = delay ? delay : EIGRP_DELAY_MIN;
return delay * EIGRP_CLASSIC_SCALER;
}
eigrp_delay_t eigrp_scaled_to_delay(eigrp_scaled_t scaled)
{
scaled = scaled / EIGRP_CLASSIC_SCALER;
scaled = scaled ? scaled : EIGRP_DELAY_MIN;
return scaled;
}
eigrp_metric_t eigrp_calculate_metrics(struct eigrp *eigrp,
struct eigrp_metrics metric)
{
eigrp_metric_t composite = 0;
if (metric.delay == EIGRP_MAX_METRIC)
return EIGRP_METRIC_MAX;
/*
* EIGRP Composite =
* {K1*BW+[(K2*BW)/(256-load)]+(K3*delay)}*{K5/(reliability+K4)}
*/
if (eigrp->k_values[0])
composite += ((eigrp_metric_t)eigrp->k_values[0] *
(eigrp_metric_t)metric.bandwidth);
if (eigrp->k_values[1])
composite += (((eigrp_metric_t)eigrp->k_values[1] *
(eigrp_metric_t)metric.bandwidth) /
(256 - metric.load));
if (eigrp->k_values[2])
composite += ((eigrp_metric_t)eigrp->k_values[2] *
(eigrp_metric_t)metric.delay);
if (eigrp->k_values[3] && !eigrp->k_values[4])
composite *= (eigrp_metric_t)eigrp->k_values[3];
if (!eigrp->k_values[3] && eigrp->k_values[4])
composite *= ((eigrp_metric_t)eigrp->k_values[4] /
(eigrp_metric_t)metric.reliability);
if (eigrp->k_values[3] && eigrp->k_values[4])
composite *= (((eigrp_metric_t)eigrp->k_values[4] /
(eigrp_metric_t)metric.reliability) +
(eigrp_metric_t)eigrp->k_values[3]);
composite =
(composite <= EIGRP_METRIC_MAX) ? composite : EIGRP_METRIC_MAX;
return composite;
}
eigrp_metric_t
eigrp_calculate_total_metrics(struct eigrp *eigrp,
struct eigrp_route_descriptor *entry)
{
struct eigrp_interface *ei = entry->ei;
eigrp_delay_t temp_delay;
eigrp_bandwidth_t bw;
entry->total_metric = entry->reported_metric;
temp_delay = entry->total_metric.delay
+ eigrp_delay_to_scaled(ei->params.delay);
entry->total_metric.delay = temp_delay > EIGRP_METRIC_MAX_CLASSIC
? EIGRP_METRIC_MAX_CLASSIC
: temp_delay;
bw = eigrp_bandwidth_to_scaled(ei->params.bandwidth);
entry->total_metric.bandwidth = entry->total_metric.bandwidth > bw
? bw
: entry->total_metric.bandwidth;
return eigrp_calculate_metrics(eigrp, entry->total_metric);
}
bool eigrp_metrics_is_same(struct eigrp_metrics metric1,
struct eigrp_metrics metric2)
{
if ((metric1.bandwidth == metric2.bandwidth)
&& (metric1.delay == metric2.delay)
&& (metric1.hop_count == metric2.hop_count)
&& (metric1.load == metric2.load)
&& (metric1.reliability == metric2.reliability)
&& (metric1.mtu[0] == metric2.mtu[0])
&& (metric1.mtu[1] == metric2.mtu[1])
&& (metric1.mtu[2] == metric2.mtu[2])) {
return true;
}
return false; /* if different */
}
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