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ospfd: install Type-7 when NSSA area is configured after redistribution

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Currently, if NSSA area is configured before redistribution is enabled,
Type-7 LSA's are installed and flooded. But if NSSA area is configured
after redistribution is enabled, Type-7 LSA's are not installed.

With this change, when NSSA area is configured, schedule a task that
scans for external LSA's. If they exist, install Type-7 and flood to
all NSSA Areas.

There already was an attempt to fix this problem in 0f321812f where
ospf_asbr_nssa_redist_task() was triggered in ospf_abr_task_timer().
This turns out to be incorrect place for this operation because it's
a one-off operation needed only after "area <ID> nssa" execution. And
ospf_abr_task_timer() is a periodic operation. Triggering
ospf_asbr_nssa_redist_task() in ospf_abr_task_timer() caused a problem
that was fixed in 945eec2b6 making the problem with NSSA area
configured after redistribution actual again.

Signed-off-by: Alexander Chernavin <achernavin@netgate.com>
This commit is contained in:
Alexander Chernavin 2021-04-12 09:34:20 -04:00
parent 53c42c82de
commit 1c1c342d2a
6 changed files with 26 additions and 4 deletions
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1
ospfd/ospf_abr.c
View File

@ -1818,7 +1818,6 @@ static int ospf_abr_task_timer(struct thread *thread)
ospf_abr_task(ospf);
ospf_abr_nssa_task(ospf); /* if nssa-abr, then scan Type-7 LSDB */
ospf_asbr_nssa_redist_task(ospf);
return 0;
}

22
ospfd/ospf_asbr.c
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@ -277,10 +277,16 @@ void ospf_asbr_status_update(struct ospf *ospf, uint8_t status)
/* If there's redistribution configured, we need to refresh external
* LSAs in order to install Type-7 and flood to all NSSA Areas
*/
void ospf_asbr_nssa_redist_task(struct ospf *ospf)
static int ospf_asbr_nssa_redist_update_timer(struct thread *thread)
{
struct ospf *ospf = THREAD_ARG(thread);
int type;
ospf->t_asbr_nssa_redist_update = NULL;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("Running ASBR NSSA redistribution update on timer");
for (type = 0; type < ZEBRA_ROUTE_MAX; type++) {
struct list *red_list;
struct listnode *node;
@ -293,10 +299,22 @@ void ospf_asbr_nssa_redist_task(struct ospf *ospf)
for (ALL_LIST_ELEMENTS_RO(red_list, node, red))
ospf_external_lsa_refresh_type(ospf, type,
red->instance,
LSA_REFRESH_IF_CHANGED);
LSA_REFRESH_FORCE);
}
ospf_external_lsa_refresh_default(ospf);
return 0;
}
void ospf_schedule_asbr_nssa_redist_update(struct ospf *ospf)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("Scheduling ASBR NSSA redistribution update");
thread_add_timer(master, ospf_asbr_nssa_redist_update_timer, ospf,
OSPF_ASBR_NSSA_REDIST_UPDATE_DELAY,
&ospf->t_asbr_nssa_redist_update);
}
void ospf_redistribute_withdraw(struct ospf *ospf, uint8_t type,

3
ospfd/ospf_asbr.h
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@ -104,6 +104,7 @@ struct ospf_external_aggr_rt {
};
#define OSPF_ASBR_CHECK_DELAY 30
#define OSPF_ASBR_NSSA_REDIST_UPDATE_DELAY 9
extern void ospf_external_route_remove(struct ospf *, struct prefix_ipv4 *);
extern struct external_info *ospf_external_info_new(uint8_t, unsigned short);
@ -121,7 +122,7 @@ extern struct external_info *ospf_external_info_lookup(struct ospf *, uint8_t,
unsigned short,
struct prefix_ipv4 *);
extern void ospf_asbr_status_update(struct ospf *, uint8_t);
extern void ospf_asbr_nssa_redist_task(struct ospf *ospf);
extern void ospf_schedule_asbr_nssa_redist_update(struct ospf *ospf);
extern void ospf_redistribute_withdraw(struct ospf *, uint8_t, unsigned short);
extern void ospf_asbr_check(void);

1
ospfd/ospf_vty.c
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@ -1546,6 +1546,7 @@ static int ospf_area_nssa_cmd_handler(struct vty *vty, int argc,
/* Flush the external LSA for the specified area */
ospf_flush_lsa_from_area(ospf, area_id, OSPF_AS_EXTERNAL_LSA);
ospf_schedule_abr_task(ospf);
ospf_schedule_asbr_nssa_redist_update(ospf);
return CMD_SUCCESS;
}

1
ospfd/ospfd.c
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@ -791,6 +791,7 @@ static void ospf_finish_final(struct ospf *ospf)
OSPF_TIMER_OFF(ospf->t_maxage_walker);
OSPF_TIMER_OFF(ospf->t_abr_task);
OSPF_TIMER_OFF(ospf->t_asbr_check);
OSPF_TIMER_OFF(ospf->t_asbr_nssa_redist_update);
OSPF_TIMER_OFF(ospf->t_distribute_update);
OSPF_TIMER_OFF(ospf->t_lsa_refresher);
OSPF_TIMER_OFF(ospf->t_opaque_lsa_self);

2
ospfd/ospfd.h
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@ -242,6 +242,8 @@ struct ospf {
/* Threads. */
struct thread *t_abr_task; /* ABR task timer. */
struct thread *t_asbr_check; /* ASBR check timer. */
struct thread *t_asbr_nssa_redist_update; /* ASBR NSSA redistribution
update timer. */
struct thread *t_distribute_update; /* Distirbute list update timer. */
struct thread *t_spf_calc; /* SPF calculation timer. */
struct thread *t_ase_calc; /* ASE calculation timer. */