diff options
| -rw-r--r-- | ospfd/ospf_abr.c | 204 |
1 files changed, 165 insertions, 39 deletions
diff --git a/ospfd/ospf_abr.c b/ospfd/ospf_abr.c index 638cf1cc..8991bd71 100644 --- a/ospfd/ospf_abr.c +++ b/ospfd/ospf_abr.c @@ -347,6 +347,133 @@ ospf_act_bb_connection (struct ospf *ospf) return ospf->backbone->full_nbrs; } +#ifdef HAVE_NSSA +/* Determine whether this router is elected translator or not for area */ +int +ospf_abr_nssa_am_elected (struct ospf_area *area) +{ + struct route_node *rn; + struct ospf_lsa *lsa; + struct router_lsa *rlsa; + struct in_addr *best = NULL; + + LSDB_LOOP ( ROUTER_LSDB (area), rn, lsa) + { + /* sanity checks */ + if (!lsa + || (lsa->data->type != OSPF_ROUTER_LSA) + || IS_LSA_SELF (lsa)) + continue; + + rlsa = (struct router_lsa *) lsa->data; + + /* ignore non-ABR routers */ + if (!IS_ROUTER_LSA_BORDER (rlsa)) + continue; + + /* Router has Nt flag - always translate */ + if (IS_ROUTER_LSA_NT (rlsa)) + { + if (IS_DEBUG_OSPF_NSSA) + zlog_info ("ospf_abr_nssa_am_elected: ", + "router %s asserts Nt", + inet_ntoa (lsa->data->id) ); + return 0; + } + + if (best == NULL) + best = &lsa->data->id; + else + if ( IPV4_ADDR_CMP (&best, &lsa->data->id) < 0) + best = &lsa->data->id; + } + + if (IS_DEBUG_OSPF_NSSA) + zlog_info ("ospf_abr_nssa_am_elected: best electable ABR is: %s", + (best) ? inet_ntoa (*best) : "<none>" ); + + if (best == NULL) + return 1; + + if ( IPV4_ADDR_CMP (&best, &area->ospf->router_id) < 0) + return 1; + else + return 0; +} + +/* Check NSSA ABR status + * assumes there are nssa areas + */ +void +ospf_abr_nssa_check_status (struct ospf *ospf) +{ + struct ospf_area *area; + listnode lnode; + + LIST_LOOP (ospf->areas, area, lnode) + { + + if (area->external_routing != OSPF_AREA_NSSA) + continue; + + if (IS_DEBUG_OSPF (nssa, NSSA)) + zlog_info ("ospf_abr_nssa_check_status: " + "checking area %s", + inet_ntoa (area->area_id)); + + if (!IS_OSPF_ABR (area->ospf)) + { + if (IS_DEBUG_OSPF (nssa, NSSA)) + zlog_info ("ospf_abr_nssa_check_status: " + "not ABR"); + area->NSSATranslatorState = OSPF_NSSA_STATE_DISABLED; + continue; + } + + switch (area->NSSATranslatorRole) + { + case OSPF_NSSA_ROLE_NEVER: + /* We never Translate Type-7 LSA. */ + /* TODO: check previous state and flush? */ + if (IS_DEBUG_OSPF (nssa, NSSA)) + zlog_info ("ospf_abr_nssa_check_status: " + "never translate"); + area->NSSATranslatorState = OSPF_NSSA_STATE_DISABLED; + continue; + + case OSPF_NSSA_ROLE_ALWAYS: + /* We always translate if we are an ABR + * TODO: originate new LSAs if state change? + * or let the nssa abr task take care of it? + */ + if (IS_DEBUG_OSPF (nssa, NSSA)) + zlog_info ("ospf_abr_nssa_check_status: " + "translate always"); + area->NSSATranslatorState = OSPF_NSSA_STATE_ENABLED; + continue; + + case OSPF_NSSA_ROLE_CANDIDATE: + /* We are a candidate for Translation */ + if (ospf_abr_nssa_am_elected (area) > 0 ) + { + area->NSSATranslatorState = OSPF_NSSA_STATE_ENABLED; + if (IS_DEBUG_OSPF (nssa, NSSA)) + zlog_info ("ospf_abr_nssa_check_status: " + "elected translator"); + } + else + { + area->NSSATranslatorState = OSPF_NSSA_STATE_DISABLED; + if (IS_DEBUG_OSPF (nssa, NSSA)) + zlog_info ("ospf_abr_nssa_check_status: " + "not elected"); + } + continue; + } + } +} +#endif /* HAVE_NSSA */ + /* Check area border router status. */ void ospf_check_abr_status (struct ospf *ospf) @@ -365,7 +492,7 @@ ospf_check_abr_status (struct ospf *ospf) for (node = listhead (ospf->areas); node; nextnode (node)) { area = getdata (node); - + if (listcount (area->oiflist)) { areas_configured++; @@ -604,9 +731,6 @@ ospf_abr_announce_network_to_area (struct prefix_ipv4 *p, u_int32_t cost, zlog_info ("ospf_abr_announce_network_to_area(): " "flooding new version of summary"); -#ifndef HAVE_NSSA - ospf_flood_through_area (area, NULL, lsa); -#endif /* ! HAVE_NSSA */ } if (IS_DEBUG_OSPF_EVENT) @@ -808,7 +932,7 @@ ospf_abr_process_nssa_translates (struct ospf *ospf) { area = getdata (node); - if (! area->NSSATranslator) + if (! area->NSSATranslatorState) continue; /* skip if not translator */ if (area->external_routing != OSPF_AREA_NSSA) @@ -1320,7 +1444,7 @@ ospf_abr_send_nssa_aggregates (struct ospf *ospf) /* temporarily turned off */ { area = getdata (node); - if (! area->NSSATranslator) + if (! area->NSSATranslatorState) continue; if (IS_DEBUG_OSPF_NSSA) @@ -1359,15 +1483,16 @@ ospf_abr_send_nssa_aggregates (struct ospf *ospf) /* temporarily turned off */ } if (range->specifics) - { - if (IS_DEBUG_OSPF_NSSA) - zlog_info ("ospf_abr_send_nssa_aggregates(): active range"); - - /* Fetch LSA-Type-7 from aggregate prefix, and then - translate, Install (as Type-5), Approve, and Flood */ - ospf_abr_translate_nssa_range (&p, range->cost); - } /* if (range->specifics)*/ - } /* all area ranges*/ + { + if (IS_DEBUG_OSPF_NSSA) + zlog_info ("ospf_abr_send_nssa_aggregates(): active range"); + + /* Fetch LSA-Type-7 from aggregate prefix, and then + * translate, Install (as Type-5), Approve, and Flood + */ + ospf_abr_translate_nssa_range (&p, range->cost); + } + } /* all area ranges*/ } /* all areas */ if (IS_DEBUG_OSPF_NSSA) @@ -1395,23 +1520,24 @@ ospf_abr_announce_nssa_defaults (struct ospf *ospf) /* By ABR-Translator */ { area = getdata (node); if (IS_DEBUG_OSPF_NSSA) - zlog_info ("ospf_abr_announce_nssa_defaults(): looking at area %s", - inet_ntoa (area->area_id)); + zlog_info ("ospf_abr_announce_nssa_defaults(): looking at area %s", + inet_ntoa (area->area_id)); if (area->external_routing != OSPF_AREA_NSSA) - continue; + continue; if (OSPF_IS_AREA_BACKBONE (area)) - continue; /* Sanity Check */ + continue; /* Sanity Check */ /* if (!TranslatorRole continue V 1.0 look for "always" conf */ - if (area->NSSATranslator) - { - if (IS_DEBUG_OSPF_NSSA) - zlog_info ("ospf_abr_announce_nssa_defaults(): " - "announcing 0.0.0.0/0 to this nssa"); - /* ospf_abr_announce_nssa_asbr_to_as (&p, area->default_cost, area); */ - } + if (area->NSSATranslatorState) + { + if (IS_DEBUG_OSPF_NSSA) + zlog_info ("ospf_abr_announce_nssa_defaults(): " + "announcing 0.0.0.0/0 to this nssa"); + /* ospf_abr_announce_nssa_asbr_to_as (&p, area->default_cost, area); */ + ospf_abr_announce_network_to_area (&p, area->default_cost, area); + } } } #endif /* HAVE_NSSA */ @@ -1606,24 +1732,24 @@ ospf_abr_nssa_task (struct ospf *ospf) /* called only if any_nssa */ /* RESET all Ranges in every Area, same as summaries */ if (IS_DEBUG_OSPF_NSSA) zlog_info ("ospf_abr_nssa_task(): NSSA initialize aggregates"); - - /* ospf_abr_prepare_aggregates (); TURNED OFF just for now */ + ospf_abr_prepare_aggregates (ospf); /*TURNED OFF just for now */ /* For all NSSAs, Type-7s, translate to 5's, INSTALL/FLOOD, or - Aggregate as Type-7 */ - /* Install or Approve in Type-5 Global LSDB */ + * Aggregate as Type-7 + * Install or Approve in Type-5 Global LSDB + */ if (IS_DEBUG_OSPF_NSSA) zlog_info ("ospf_abr_nssa_task(): process translates"); - ospf_abr_process_nssa_translates (ospf); /* Translate/Send any "ranged" aggregates, and also 5-Install and - Approve */ - /* Scan Type-7's for aggregates, translate to Type-5's, - Install/Flood/Approve */ + * Approve + * Scan Type-7's for aggregates, translate to Type-5's, + * Install/Flood/Approve + */ if (IS_DEBUG_OSPF_NSSA) zlog_info("ospf_abr_nssa_task(): send NSSA aggregates"); - /* ospf_abr_send_nssa_aggregates (); TURNED OFF FOR NOW */ + ospf_abr_send_nssa_aggregates (ospf); /*TURNED OFF FOR NOW */ /* Send any NSSA defaults as Type-5 */ if (IS_DEBUG_OSPF_NSSA) @@ -1690,10 +1816,6 @@ ospf_abr_task (struct ospf *ospf) ospf_abr_manage_discard_routes (ospf); -#ifdef HAVE_NSSA - ospf_abr_nssa_task (ospf); /* if nssa-abr, then scan Type-7 LSDB */ -#endif /* HAVE_NSSA */ - if (IS_DEBUG_OSPF_EVENT) zlog_info ("ospf_abr_task(): Stop"); } @@ -1712,6 +1834,10 @@ ospf_abr_task_timer (struct thread *thread) ospf_check_abr_status (ospf); ospf_abr_task (ospf); +#ifdef HAVE_NSSA + ospf_abr_nssa_check_status (ospf); + ospf_abr_nssa_task (ospf); /* if nssa-abr, then scan Type-7 LSDB */ +#endif /* HAVE_NSSA */ return 0; } |