diff options
Diffstat (limited to 'ospfd/ospf_lsa.c')
| -rw-r--r-- | ospfd/ospf_lsa.c | 69 |
1 files changed, 60 insertions, 9 deletions
diff --git a/ospfd/ospf_lsa.c b/ospfd/ospf_lsa.c index 079eea54..4711f0fe 100644 --- a/ospfd/ospf_lsa.c +++ b/ospfd/ospf_lsa.c @@ -2380,8 +2380,9 @@ ospf_router_lsa_install (struct ospf *ospf, area->router_lsa_self = ospf_lsa_lock (new); if (IS_DEBUG_OSPF (lsa, LSA_INSTALL)) - zlog_info("LSA[Type%d]: ID %s is self-originated", - new->data->type, inet_ntoa (new->data->id)); + zlog_info("LSA[Type%d]: ID %s seq 0x%x is self-originated", + new->data->type, inet_ntoa (new->data->id), + new->data->ls_seqnum); } return new; @@ -2641,6 +2642,44 @@ ospf_lsa_install (struct ospf *ospf, struct ospf_interface *oi, if ( old == NULL || ospf_lsa_different(old, lsa)) rt_recalc = 1; + /* + Sequence number check (Section 14.1 of rfc 2328) + "Premature aging is used when it is time for a self-originated + LSA's sequence number field to wrap. At this point, the current + LSA instance (having LS sequence number MaxSequenceNumber) must + be prematurely aged and flushed from the routing domain before a + new instance with sequence number equal to InitialSequenceNumber + can be originated. " + */ + + if (lsa->data->ls_seqnum - 1 == htonl(OSPF_MAX_SEQUENCE_NUMBER)) + { + if (ospf_lsa_is_self_originated(ospf, lsa)) + { + lsa->data->ls_seqnum = htonl(OSPF_MAX_SEQUENCE_NUMBER); + if (!IS_LSA_MAXAGE(lsa)) + lsa->flags |= OSPF_LSA_PREMATURE_AGE; + lsa->data->ls_age = htons (OSPF_LSA_MAXAGE); + + if (IS_DEBUG_OSPF (lsa, LSA_REFRESH)) + { + zlog_info ("ospf_lsa_install() Premature Aging " + "lsa 0x%lx", (u_long)lsa); + ospf_lsa_header_dump (lsa->data); + } + } + else + { + if (IS_DEBUG_OSPF (lsa, LSA_GENERATE)) + { + zlog_info ("ospf_lsa_install() got an lsa with seq 0x80000000 " + "that was not self originated. Ignoring\n"); + ospf_lsa_header_dump (lsa->data); + } + return old; + } + } + /* discard old LSA from LSDB */ if (old != NULL) ospf_discard_from_db (ospf, lsdb, lsa); @@ -2722,12 +2761,16 @@ ospf_lsa_install (struct ospf *ospf, struct ospf_interface *oi, } } - /* If received LSA' ls_age is MaxAge, set LSA on MaxAge LSA list. */ - if (IS_LSA_MAXAGE (new) && !IS_LSA_SELF (new)) + /* + If received LSA' ls_age is MaxAge, or lsa is being prematurely aged + (it's getting flushed out of the area), set LSA on MaxAge LSA list. + */ + if ((lsa->flags & OSPF_LSA_PREMATURE_AGE) || + (IS_LSA_MAXAGE (new) && !IS_LSA_SELF (new))) { - if (IS_DEBUG_OSPF (lsa, LSA_FLOODING)) - zlog_info ("LSA[Type%d:%s]: Install LSA, MaxAge", - new->data->type, inet_ntoa (new->data->id)); + if (IS_DEBUG_OSPF (lsa, LSA_INSTALL)) + zlog_info ("LSA[Type%d:%s]: Install LSA 0x%lx, MaxAge", + new->data->type, inet_ntoa (new->data->id), (u_long)lsa); ospf_lsa_maxage (ospf, lsa); } @@ -2822,8 +2865,8 @@ ospf_maxage_lsa_remover (struct thread *thread) /* Remove LSA from the LSDB */ if (CHECK_FLAG (lsa->flags, OSPF_LSA_SELF)) if (IS_DEBUG_OSPF (lsa, LSA_FLOODING)) - zlog_info ("LSA[Type%d:%s]: This LSA is self-originated: ", - lsa->data->type, inet_ntoa (lsa->data->id)); + zlog_info ("LSA[Type%d:%s]: LSA 0x%lx is self-oririnated: ", + lsa->data->type, inet_ntoa (lsa->data->id), (u_long)lsa); if (IS_DEBUG_OSPF (lsa, LSA_FLOODING)) zlog_info ("LSA[Type%d:%s]: MaxAge LSA removed from list", @@ -2836,6 +2879,14 @@ ospf_maxage_lsa_remover (struct thread *thread) ospf_flood_through (ospf, NULL, lsa); #endif /* ORIGINAL_CODING */ + if (lsa->flags & OSPF_LSA_PREMATURE_AGE) + { + if (IS_DEBUG_OSPF (lsa, LSA_FLOODING)) + zlog_info ("originating new router lsa for lsa 0x%lx \n", + (u_long)lsa); + ospf_router_lsa_originate(lsa->area); + } + /* Remove from lsdb. */ ospf_discard_from_db (ospf, lsa->lsdb, lsa); ospf_lsdb_delete (lsa->lsdb, lsa); |