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ospfd: fix behavior of +/-metric

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OSPFD uses -1 as a sentinel value for uninitialized metrics. When
applying a route map with a +/-metric to redistributed routes, we were
using -1 as our base value to increment or decrement on, which meant
that if you set e.g. +10, you would end up with a redistributed route of
metric 9.

This patch also removes an off-by-one sanity check that would cause a
set metric +1 or set metric 0 to result in a metric value of 20 :-)

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>
This commit is contained in:
Quentin Young 2019-04-08 17:05:45 +00:00
parent 421ac5391f
commit 236e900ca4
3 changed files with 11 additions and 10 deletions
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6
ospfd/ospf_lsa.c
View File

@ -1499,12 +1499,6 @@ struct in_addr ospf_get_nssa_ip(struct ospf_area *area)
return fwd;
}
#define DEFAULT_DEFAULT_METRIC 20
#define DEFAULT_DEFAULT_ORIGINATE_METRIC 10
#define DEFAULT_DEFAULT_ALWAYS_METRIC 1
#define DEFAULT_METRIC_TYPE EXTERNAL_METRIC_TYPE_2
int metric_type(struct ospf *ospf, uint8_t src, unsigned short instance)
{
struct ospf_redist *red;

6
ospfd/ospf_lsa.h
View File

@ -24,6 +24,12 @@
#include "stream.h"
/* OSPF LSA Default metric values */
#define DEFAULT_DEFAULT_METRIC 20
#define DEFAULT_DEFAULT_ORIGINATE_METRIC 10
#define DEFAULT_DEFAULT_ALWAYS_METRIC 1
#define DEFAULT_METRIC_TYPE EXTERNAL_METRIC_TYPE_2
/* OSPF LSA Range definition. */
#define OSPF_MIN_LSA 1 /* begin range here */
#define OSPF_MAX_LSA 12

9
ospfd/ospf_routemap.c
View File

@ -374,15 +374,16 @@ static route_map_result_t route_set_metric(void *rule,
/* Set metric out value. */
if (!metric->used)
return RMAP_OKAY;
ei->route_map_set.metric = DEFAULT_DEFAULT_METRIC;
if (metric->type == metric_increment)
ei->route_map_set.metric += metric->metric;
if (metric->type == metric_decrement)
else if (metric->type == metric_decrement)
ei->route_map_set.metric -= metric->metric;
if (metric->type == metric_absolute)
else if (metric->type == metric_absolute)
ei->route_map_set.metric = metric->metric;
if ((signed int)ei->route_map_set.metric < 1)
ei->route_map_set.metric = -1;
if (ei->route_map_set.metric > OSPF_LS_INFINITY)
ei->route_map_set.metric = OSPF_LS_INFINITY;
}