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ospf6d: handle seqnum wrapping

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Signed-off-by: Shrijeet Mukherjee <shm at cumulusnetworks.com>
Reviewed-by: Dinesh G Dutt <ddutt at cumulusnetworks.com>
[DL: mechanical adjust to rebase]
[DL: adjust to removal of timerwheel code]
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
This commit is contained in:
Dinesh Dutt 2013-08-24 08:00:44 +00:00 committed by David Lamparter
parent f41b4a0216
commit 3b220289a4
3 changed files with 34 additions and 1 deletions
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19
ospf6d/ospf6_flood.c
View File

@ -230,6 +230,25 @@ ospf6_install_lsa (struct ospf6_lsa *lsa)
else
lsa->expire = NULL;
if (OSPF6_LSA_IS_SEQWRAP(lsa) &&
! (CHECK_FLAG(lsa->flag,OSPF6_LSA_SEQWRAPPED) &&
lsa->header->seqnum == htonl(OSPF_MAX_SEQUENCE_NUMBER)))
{
if (IS_OSPF6_DEBUG_EXAMIN_TYPE (lsa->header->type))
zlog_debug("lsa install wrapping: sequence 0x%x",
ntohl(lsa->header->seqnum));
SET_FLAG(lsa->flag, OSPF6_LSA_SEQWRAPPED);
/* in lieu of premature_aging, since we do not want to recreate this lsa
* and/or mess with timers etc, we just want to wrap the sequence number
* and reflood the lsa before continuing.
* NOTE: Flood needs to be called right after this function call, by the
* caller
*/
lsa->header->seqnum = htonl (OSPF_MAX_SEQUENCE_NUMBER);
lsa->header->age = htons (OSPF_LSA_MAXAGE);
ospf6_lsa_checksum (lsa->header);
}
/* actually install */
lsa->installed = now;
ospf6_lsdb_add (lsa, lsa->lsdb);

3
ospf6d/ospf6_lsa.h
View File

@ -109,6 +109,8 @@ struct ospf6_lsa_header
#define OSPF6_LSA_IS_DIFFER(L1, L2) ospf6_lsa_is_differ (L1, L2)
#define OSPF6_LSA_IS_MAXAGE(L) (ospf6_lsa_age_current (L) == OSPF_LSA_MAXAGE)
#define OSPF6_LSA_IS_CHANGED(L1, L2) ospf6_lsa_is_changed (L1, L2)
#define OSPF6_LSA_IS_SEQWRAP(L) ((L)->header->seqnum == htonl(OSPF_MAX_SEQUENCE_NUMBER + 1))
struct ospf6_lsa
{
@ -139,6 +141,7 @@ struct ospf6_lsa
#define OSPF6_LSA_FLOODBACK 0x02
#define OSPF6_LSA_DUPLICATE 0x04
#define OSPF6_LSA_IMPLIEDACK 0x08
#define OSPF6_LSA_SEQWRAPPED 0x20
struct ospf6_lsa_handler
{

11
ospf6d/ospf6_lsdb.c
View File

@ -465,8 +465,19 @@ ospf6_lsdb_maxage_remover (struct ospf6_lsdb *lsdb)
}
if (IS_OSPF6_DEBUG_LSA_TYPE (lsa->header->type))
zlog_debug ("Remove MaxAge %s", lsa->name);
if (CHECK_FLAG(lsa->flag, OSPF6_LSA_SEQWRAPPED))
{
UNSET_FLAG(lsa->flag, OSPF6_LSA_SEQWRAPPED);
/*
* lsa->header->age = 0;
*/
lsa->header->seqnum = htonl(OSPF_MAX_SEQUENCE_NUMBER + 1);
ospf6_lsa_checksum (lsa->header);
thread_execute (master, ospf6_lsa_refresh, lsa, 0);
} else {
ospf6_lsdb_remove (lsa, lsdb);
}
}
return (reschedule);
}