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