Initial revision

1 files changed, 1741 insertions, 0 deletions

diff --git a/ospfd/ospf_abr.c b/ospfd/ospf_abr.c
new file mode 100644
index 000000000..ec3b153c4
--- /dev/null
+++ b/ospfd/ospf_abr.c
@@ -0,0 +1,1741 @@
+/*
+ * OSPF ABR functions.
+ * Copyright (C) 1999, 2000 Alex Zinin, Toshiaki Takada
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ * 
+ * GNU Zebra is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Zebra; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+
+#include <zebra.h>
+
+#include "thread.h"
+#include "memory.h"
+#include "linklist.h"
+#include "prefix.h"
+#include "if.h"
+#include "table.h"
+#include "vty.h"
+#include "filter.h"
+#include "plist.h"
+#include "log.h"
+
+#include "ospfd/ospfd.h"
+#include "ospfd/ospf_interface.h"
+#include "ospfd/ospf_ism.h"
+#include "ospfd/ospf_asbr.h"
+#include "ospfd/ospf_lsa.h"
+#include "ospfd/ospf_lsdb.h"
+#include "ospfd/ospf_neighbor.h"
+#include "ospfd/ospf_nsm.h"
+#include "ospfd/ospf_spf.h"
+#include "ospfd/ospf_route.h"
+#include "ospfd/ospf_ia.h"
+#include "ospfd/ospf_flood.h"
+#include "ospfd/ospf_abr.h"
+#include "ospfd/ospf_ase.h"
+#include "ospfd/ospf_zebra.h"
+#include "ospfd/ospf_dump.h"
+
+
+struct ospf_area_range *
+ospf_area_range_new (struct prefix_ipv4 *p)
+{
+  struct ospf_area_range *range;
+
+  range = XCALLOC (MTYPE_OSPF_AREA_RANGE, sizeof (struct ospf_area_range));
+  range->addr = p->prefix;
+  range->masklen = p->prefixlen;
+  range->cost_config = OSPF_AREA_RANGE_COST_UNSPEC;
+
+  return range;
+}
+
+void
+ospf_area_range_free (struct ospf_area_range *range)
+{
+  XFREE (MTYPE_OSPF_AREA_RANGE, range);
+}
+
+void
+ospf_area_range_add (struct ospf_area *area, struct ospf_area_range *range)
+{
+  struct route_node *rn;
+  struct prefix_ipv4 p;
+
+  p.family = AF_INET;
+  p.prefixlen = range->masklen;
+  p.prefix = range->addr;
+
+  rn = route_node_get (area->ranges, (struct prefix *)&p);
+  if (rn->info)
+    route_unlock_node (rn);
+  else
+    rn->info = range;
+}
+
+void
+ospf_area_range_delete (struct ospf_area *area, struct ospf_area_range *range)
+{
+  struct route_node *rn;
+  struct prefix_ipv4 p;
+
+  p.family = AF_INET;
+  p.prefixlen = range->masklen;
+  p.prefix = range->addr;
+
+  rn = route_node_lookup (area->ranges, (struct prefix *)&p);
+  if (rn)
+    {
+      ospf_area_range_free (rn->info);
+      rn->info = NULL;
+      route_unlock_node (rn);
+      route_unlock_node (rn);
+    }
+}
+
+struct ospf_area_range *
+ospf_area_range_lookup (struct ospf_area *area, struct prefix_ipv4 *p)
+{
+  struct route_node *rn;
+
+  rn = route_node_lookup (area->ranges, (struct prefix *)p);
+  if (rn)
+    {
+      route_unlock_node (rn);
+      return rn->info;
+    }
+  return NULL;
+}
+
+struct ospf_area_range *
+ospf_area_range_lookup_next (struct ospf_area *area, struct in_addr *range_net,
+			     int first)
+{
+  struct route_node *rn;
+  struct prefix_ipv4 p;
+  struct ospf_area_range *find;
+
+  p.family = AF_INET;
+  p.prefixlen = IPV4_MAX_BITLEN;
+  p.prefix = *range_net;
+
+  if (first)
+    rn = route_top (area->ranges);
+  else
+    {
+      rn = route_node_get (area->ranges, (struct prefix *) &p);
+      rn = route_next (rn);
+    }
+
+  for (; rn; rn = route_next (rn))
+    if (rn->info)
+      break;
+
+  if (rn && rn->info)
+    {
+      find = rn->info;
+      *range_net = rn->p.u.prefix4;
+      route_unlock_node (rn);
+      return find;
+    }
+  return NULL;
+}
+
+struct ospf_area_range *
+ospf_area_range_match (struct ospf_area *area, struct prefix_ipv4 *p)
+{
+  struct route_node *node;
+
+  node = route_node_match (area->ranges, (struct prefix *) p);
+  if (node)
+    {
+      route_unlock_node (node);
+      return node->info;
+    }
+  return NULL;
+}
+
+struct ospf_area_range *
+ospf_area_range_match_any (struct ospf *ospf, struct prefix_ipv4 *p)
+{
+  struct ospf_area_range *range;
+  listnode node;
+
+  for (node = listhead (ospf->areas); node; nextnode (node))
+    if ((range = ospf_area_range_match (node->data, p)))
+      return range;
+
+  return NULL;
+}
+
+int
+ospf_area_range_active (struct ospf_area_range *range)
+{
+  return range->specifics;
+}
+
+int
+ospf_area_actively_attached (struct ospf_area *area)
+{
+  return area->act_ints;
+}
+
+int
+ospf_area_range_set (struct ospf *ospf, struct in_addr area_id,
+		     struct prefix_ipv4 *p, int advertise)
+{
+  struct ospf_area *area;
+  struct ospf_area_range *range;
+  int ret = OSPF_AREA_ID_FORMAT_DECIMAL;
+
+  area = ospf_area_get (area_id, ret);
+  if (area == NULL)
+    return 0;
+
+  range = ospf_area_range_lookup (area, p);
+  if (range != NULL)
+    {
+      if ((CHECK_FLAG (range->flags, OSPF_AREA_RANGE_ADVERTISE)
+	   && !CHECK_FLAG (advertise, OSPF_AREA_RANGE_ADVERTISE))
+	  || (!CHECK_FLAG (range->flags, OSPF_AREA_RANGE_ADVERTISE)
+	      && CHECK_FLAG (advertise, OSPF_AREA_RANGE_ADVERTISE)))
+	ospf_schedule_abr_task ();
+    }
+  else
+    {
+      range = ospf_area_range_new (p);
+      ospf_area_range_add (area, range);
+      ospf_schedule_abr_task ();
+    }
+
+  if (CHECK_FLAG (advertise, OSPF_AREA_RANGE_ADVERTISE))
+    SET_FLAG (range->flags, OSPF_AREA_RANGE_ADVERTISE);
+  else
+    UNSET_FLAG (range->flags, OSPF_AREA_RANGE_ADVERTISE);
+
+  return 1;
+}
+
+int
+ospf_area_range_cost_set (struct ospf *ospf, struct in_addr area_id,
+			  struct prefix_ipv4 *p, u_int32_t cost)
+{
+  struct ospf_area *area;
+  struct ospf_area_range *range;
+  int ret = OSPF_AREA_ID_FORMAT_DECIMAL;
+
+  area = ospf_area_get (area_id, ret);
+  if (area == NULL)
+    return 0;
+
+  range = ospf_area_range_new (p);
+  if (range == NULL)
+    return 0;
+
+  if (range->cost_config != cost)
+    {
+      range->cost_config = cost;
+      if (ospf_area_range_active (range))
+	ospf_schedule_abr_task ();
+    }
+
+  return 1;
+}
+
+int
+ospf_area_range_unset (struct ospf *ospf, struct in_addr area_id,
+		       struct prefix_ipv4 *p)
+{
+  struct ospf_area *area;
+  struct ospf_area_range *range;
+
+  area = ospf_area_lookup_by_area_id (area_id);
+  if (area == NULL)
+    return 0;
+
+  range = ospf_area_range_lookup (area, p);
+  if (range == NULL)
+    return 0;
+
+  if (ospf_area_range_active (range))
+    ospf_schedule_abr_task ();
+
+  ospf_area_range_delete (area, range);
+
+  return 1;
+}
+
+int
+ospf_area_range_substitute_set (struct ospf *ospf, struct in_addr area_id,
+				struct prefix_ipv4 *p, struct prefix_ipv4 *s)
+{
+  struct ospf_area *area;
+  struct ospf_area_range *range;
+  int ret = OSPF_AREA_ID_FORMAT_DECIMAL;
+
+  area = ospf_area_get (area_id, ret);
+  range = ospf_area_range_lookup (area, p);
+
+  if (range != NULL)
+    {
+      if (!CHECK_FLAG (range->flags, OSPF_AREA_RANGE_ADVERTISE) ||
+	  !CHECK_FLAG (range->flags, OSPF_AREA_RANGE_SUBSTITUTE))
+	ospf_schedule_abr_task ();
+    }
+  else
+    {
+      range = ospf_area_range_new (p);
+      ospf_area_range_add (area, range);
+      ospf_schedule_abr_task ();
+    }
+
+  SET_FLAG (range->flags, OSPF_AREA_RANGE_ADVERTISE);
+  SET_FLAG (range->flags, OSPF_AREA_RANGE_SUBSTITUTE);
+  range->subst_addr = s->prefix;
+  range->subst_masklen = s->prefixlen;
+
+  return 1;
+}
+
+int
+ospf_area_range_substitute_unset (struct ospf *ospf, struct in_addr area_id,
+				  struct prefix_ipv4 *p)
+{
+  struct ospf_area *area;
+  struct ospf_area_range *range;
+
+  area = ospf_area_lookup_by_area_id (area_id);
+  if (area == NULL)
+    return 0;
+
+  range = ospf_area_range_lookup (area, p);
+  if (range == NULL)
+    return 0;
+
+  if (CHECK_FLAG (range->flags, OSPF_AREA_RANGE_SUBSTITUTE))
+    if (ospf_area_range_active (range))
+      ospf_schedule_abr_task ();
+
+  UNSET_FLAG (range->flags, OSPF_AREA_RANGE_SUBSTITUTE);
+  range->subst_addr.s_addr = 0;
+  range->subst_masklen = 0;
+
+  return 1;
+}
+
+int
+ospf_act_bb_connection ()
+{
+  if (ospf_top->backbone == NULL)
+    return 0;
+
+  return ospf_top->backbone->full_nbrs;
+}
+
+/* Check area border router status. */
+void
+ospf_check_abr_status ()
+{
+  struct ospf_area *area;
+  listnode node;
+  int bb_configured = 0;
+  int bb_act_attached = 0;
+  int areas_configured = 0;
+  int areas_act_attached = 0;
+
+  u_char new_flags = ospf_top->flags;
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_check_abr_status(): Start");
+
+  for (node = listhead (ospf_top->areas); node; nextnode (node))
+    {
+      area = getdata (node);
+
+      if (listcount (area->oiflist)) 
+	{
+	  areas_configured++;
+	  
+	  if (OSPF_IS_AREA_BACKBONE (area))
+ 	    bb_configured = 1;
+	}
+
+      if (ospf_area_actively_attached (area))
+	{
+	  areas_act_attached++;
+	  
+	  if (OSPF_IS_AREA_BACKBONE (area))
+            bb_act_attached = 1;
+	}
+    }
+
+  if (IS_DEBUG_OSPF_EVENT)
+    {
+      zlog_info ("ospf_check_abr_status(): looked through areas");
+      zlog_info ("ospf_check_abr_status(): bb_configured: %d", bb_configured);
+      zlog_info ("ospf_check_abr_status(): bb_act_attached: %d",
+		 bb_act_attached);
+      zlog_info ("ospf_check_abr_status(): areas_configured: %d",
+		 areas_configured);
+      zlog_info ("ospf_check_abr_status(): areas_act_attached: %d",
+		 areas_act_attached);
+    }
+
+  switch (ospf_top->abr_type)
+    {
+    case OSPF_ABR_SHORTCUT:
+    case OSPF_ABR_STAND:
+      if (areas_act_attached > 1)
+	SET_FLAG (new_flags, OSPF_FLAG_ABR);
+      else
+	UNSET_FLAG (new_flags, OSPF_FLAG_ABR);
+      break;
+
+    case OSPF_ABR_IBM:
+      if ((areas_act_attached > 1) && bb_configured)
+	SET_FLAG (new_flags, OSPF_FLAG_ABR);
+      else
+	UNSET_FLAG (new_flags, OSPF_FLAG_ABR);
+      break;
+
+    case OSPF_ABR_CISCO:
+      if ((areas_configured > 1) && bb_act_attached)
+	SET_FLAG (new_flags, OSPF_FLAG_ABR);
+      else
+	UNSET_FLAG (new_flags, OSPF_FLAG_ABR);
+      break;
+    default:
+      break;
+    }
+
+  if (new_flags != ospf_top->flags)
+    {
+      ospf_spf_calculate_schedule ();
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_check_abr_status(): new router flags: %x",new_flags);
+      ospf_top->flags = new_flags;
+      OSPF_TIMER_ON (ospf_top->t_router_lsa_update,
+		     ospf_router_lsa_update_timer, OSPF_LSA_UPDATE_DELAY);
+    }
+}
+
+void
+ospf_abr_update_aggregate (struct ospf_area_range *range,
+			   struct ospf_route *or)
+{
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_update_aggregate(): Start");
+
+  if (range->cost_config != -1)
+    {
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_update_aggregate(): use configured cost %d",
+		   range->cost_config);
+
+      range->cost = range->cost_config;
+    }
+  else
+    {
+      if (range->specifics == 0)
+	range->cost = or->cost; /* 1st time get 1st cost */
+
+      if (or->cost < range->cost)
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info ("ospf_abr_update_aggregate(): lowest cost, update");
+
+	  range->cost = or->cost;
+	}
+    }
+
+  range->specifics++;
+}
+
+static void
+set_metric (struct ospf_lsa *lsa, u_int32_t metric)
+{
+  struct summary_lsa *header;
+  u_char *mp;
+  metric = htonl (metric);
+  mp = (char *) &metric;
+  mp++;
+  header = (struct summary_lsa *) lsa->data;
+  memcpy(header->metric, mp, 3);
+}
+
+#ifdef HAVE_NSSA
+int
+ospf_abr_check_nssa_range (struct prefix_ipv4 *p, u_int32_t cost,
+				   struct ospf_area *area)
+{
+  /* The Type-7 is tested against the aggregated prefix and forwarded
+       for lsa installation and flooding */
+  return 0;
+}
+
+/* ospf_abr_translate_nssa */
+int
+ospf_abr_translate_nssa (struct ospf_lsa *lsa, void *p_arg, int int_arg)
+{
+  /* Incoming Type-7 or later aggregated Type-7 
+
+     LSA is skipped if P-bit is off.
+     LSA is aggregated if within range.
+
+     The Type-7 is translated, Installed/Approved as a Type-5 into
+     global LSDB, then Flooded through AS
+
+     Later, any Unapproved Translated Type-5's are flushed/discarded */
+
+  struct ospf_lsa *dup;
+
+  if (! CHECK_FLAG (lsa->data->options, OSPF_OPTION_NP))
+    {
+      if (IS_DEBUG_OSPF_NSSA)
+	zlog_info ("ospf_abr_nssa(): P-bit off, NO Translation");
+      return 0; 
+    }
+
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("ospf_abr_nssa(): TRANSLATING 7 to 5");
+
+  /* No more P-bit. */
+  /* UNSET_FLAG (lsa->data->options, OSPF_OPTION_NP); */
+
+  /* Area where Aggregate testing will be inserted, just like summary
+     advertisements */
+  /* ospf_abr_check_nssa_range (p_arg, lsa-> cost, lsa -> area); */
+
+  /* Follow thru here means no aggregation */
+  dup = ospf_lsa_dup (lsa);	/* keep LSDB intact, lock = 1 */
+
+  SET_FLAG (dup->flags, OSPF_LSA_LOCAL_XLT); /* Translated from 7  */
+  SET_FLAG (dup->flags, OSPF_LSA_APPROVED); /* So, do not remove it */
+
+  dup->data->type = OSPF_AS_EXTERNAL_LSA;  /* make Type-5 */
+
+  ospf_lsa_checksum (dup->data);
+
+  ospf_lsa_install (NULL, dup); /* Install this Type-5 into LSDB, Lock = 2. */
+
+  ospf_flood_through_as (NULL, dup); /* flood non-NSSA/STUB areas */
+  
+  /* This translated Type-5 will go to all non-NSSA areas connected to
+     this ABR; The Type-5 could come from any of the NSSA's connected
+     to this ABR.  */
+
+  return 0;
+}
+
+void
+ospf_abr_translate_nssa_range (struct prefix_ipv4 *p, u_int32_t cost)
+{
+  /* The Type-7 is created from the aggregated prefix and forwarded
+     for lsa installation and flooding... to be added... */
+}
+#endif /* HAVE_NSSA */
+
+void
+ospf_abr_announce_network_to_area (struct prefix_ipv4 *p, u_int32_t cost,
+				   struct ospf_area *area)
+{
+  struct ospf_lsa *lsa, *old = NULL;
+  struct summary_lsa *sl = NULL;
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_announce_network_to_area(): Start");
+
+  old = OSPF_SUMMARY_LSA_SELF_FIND_BY_PREFIX (area, p);
+
+  if (old)
+    {
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_announce_network_to_area(): old summary found");
+      sl = (struct summary_lsa *) old->data;
+
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_announce_network_to_area(): "
+		   "old metric: %d, new metric: %d",
+		   GET_METRIC (sl->metric), cost);
+    }
+
+  if (old && (GET_METRIC (sl->metric) == cost))
+    {
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_announce_network_to_area(): "
+		   "old summary approved"); 
+      SET_FLAG (old->flags, OSPF_LSA_APPROVED);
+    }
+  else
+    {
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_announce_network_to_area(): "
+		   "creating new summary");
+      if (old)
+	{
+
+	  set_metric (old, cost);
+	  lsa = ospf_summary_lsa_refresh (old);
+	  /* This will flood through area. */
+	}
+      else
+	{
+	  lsa = ospf_summary_lsa_originate (p, cost, area);
+	  /* This will flood through area. */
+	}
+      
+
+      SET_FLAG (lsa->flags, OSPF_LSA_APPROVED);
+      if (IS_DEBUG_OSPF_EVENT)
+	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)
+    zlog_info ("ospf_abr_announce_network_to_area(): Stop");
+}
+
+int
+ospf_abr_nexthops_belong_to_area (struct ospf_route *or,
+				  struct ospf_area *area)
+{
+  listnode node;
+
+  for (node = listhead (or->path); node; nextnode (node))
+    {
+      struct ospf_path *path = node->data;
+      struct ospf_interface *oi = path->oi;
+
+      if (oi != NULL)
+	if (oi->area == area)
+	  return 1;
+    }
+
+  return 0;
+}
+
+int
+ospf_abr_should_accept (struct prefix *p, struct ospf_area *area)
+{
+  if (IMPORT_NAME (area))
+    {
+      if (IMPORT_LIST (area) == NULL)
+	IMPORT_LIST (area) = access_list_lookup (AFI_IP, IMPORT_NAME (area));
+
+      if (IMPORT_LIST (area))
+        if (access_list_apply (IMPORT_LIST (area), p) == FILTER_DENY)
+           return 0;
+    }
+
+ return 1;
+}
+
+int
+ospf_abr_plist_in_check (struct ospf_area *area, struct ospf_route *or,
+			 struct prefix *p)
+{
+  if (PREFIX_NAME_IN (area))
+    {
+      if (PREFIX_LIST_IN (area) == NULL)
+	PREFIX_LIST_IN (area) = prefix_list_lookup (AFI_IP,
+						    PREFIX_NAME_IN (area));
+      if (PREFIX_LIST_IN (area))
+	if (prefix_list_apply (PREFIX_LIST_IN (area), p) != PREFIX_PERMIT)
+	  return 0;
+    }
+  return 1;
+}
+
+int
+ospf_abr_plist_out_check (struct ospf_area *area, struct ospf_route *or,
+			  struct prefix *p)
+{
+  if (PREFIX_NAME_OUT (area))
+    {
+      if (PREFIX_LIST_OUT (area) == NULL)
+	PREFIX_LIST_OUT (area) = prefix_list_lookup (AFI_IP,
+						     PREFIX_NAME_OUT (area));
+      if (PREFIX_LIST_OUT (area))
+	if (prefix_list_apply (PREFIX_LIST_OUT (area), p) != PREFIX_PERMIT)
+	  return 0;
+    }
+  return 1;
+}
+
+void
+ospf_abr_announce_network (struct route_node *n, struct ospf_route *or)
+{
+  listnode node;
+  struct ospf_area_range *range;
+  struct prefix_ipv4 *p;
+  struct ospf_area *area, *or_area;
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_announce_network(): Start");
+  p = (struct prefix_ipv4 *) &n->p;
+
+  or_area = ospf_area_lookup_by_area_id (or->u.std.area_id); 
+  assert (or_area);
+
+  for (node = listhead (ospf_top->areas); node; nextnode (node))
+    {
+      area = getdata (node);
+
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_announce_network(): looking at area %s",
+		   inet_ntoa (area->area_id));
+
+      if (IPV4_ADDR_SAME (&or->u.std.area_id, &area->area_id))
+	continue;
+
+      if (ospf_abr_nexthops_belong_to_area (or, area))
+	continue;
+
+      if (!ospf_abr_should_accept (&n->p, area))
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info ("ospf_abr_announce_network(): "
+		       "prefix %s/%d was denied by import-list",
+		       inet_ntoa (p->prefix), p->prefixlen);
+	  continue; 
+	}
+
+      if (!ospf_abr_plist_in_check (area, or, &n->p))
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info ("ospf_abr_announce_network(): "
+		       "prefix %s/%d was denied by prefix-list",
+		       inet_ntoa (p->prefix), p->prefixlen);
+	  continue; 
+	}
+
+      if (area->external_routing != OSPF_AREA_DEFAULT && area->no_summary)
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info ("ospf_abr_announce_network(): "
+		       "area %s is stub and no_summary",
+		       inet_ntoa (area->area_id));
+          continue;
+	}
+
+      if (or->path_type == OSPF_PATH_INTER_AREA)
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info ("ospf_abr_announce_network(): this is "
+		       "inter-area route to %s/%d",
+		       inet_ntoa (p->prefix), p->prefixlen);
+
+          if (!OSPF_IS_AREA_BACKBONE (area))
+	    ospf_abr_announce_network_to_area (p, or->cost, area);
+	}
+
+      if (or->path_type == OSPF_PATH_INTRA_AREA)
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info ("ospf_abr_announce_network(): "
+		       "this is intra-area route to %s/%d",
+		       inet_ntoa (p->prefix), p->prefixlen);
+	  if ((range = ospf_area_range_match (or_area, p)) &&
+              !ospf_area_is_transit (area))
+	    ospf_abr_update_aggregate (range, or);
+	  else
+	    ospf_abr_announce_network_to_area (p, or->cost, area);
+	}
+    }
+}
+
+int
+ospf_abr_should_announce (struct prefix *p, struct ospf_route *or)
+{
+  struct ospf_area *area = ospf_area_lookup_by_area_id (or->u.std.area_id);
+
+  assert (area);
+  
+  if (EXPORT_NAME (area))
+    {
+      if (EXPORT_LIST (area) == NULL)
+	EXPORT_LIST (area) = access_list_lookup (AFI_IP, EXPORT_NAME (area));
+
+      if (EXPORT_LIST (area))
+        if (access_list_apply (EXPORT_LIST (area), p) == FILTER_DENY)
+           return 0;
+    }
+
+  return 1;
+}
+
+#ifdef HAVE_NSSA
+void
+ospf_abr_process_nssa_translates ()
+{
+  /* Scan through all NSSA_LSDB records for all areas;
+
+     If P-bit is on, translate all Type-7's to 5's and aggregate or
+     flood install as approved in Type-5 LSDB with XLATE Flag on
+     later, do same for all aggregates...  At end, DISCARD all
+     remaining UNAPPROVED Type-5's (Aggregate is for future ) */
+  listnode node;
+  struct ospf_area *area;
+
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("ospf_abr_process_nssa_translates(): Start");
+
+  for (node = listhead (ospf_top->areas); node; nextnode (node))
+    {
+      area = getdata (node);
+
+      if (! area->NSSATranslator)
+	continue; /* skip if not translator */
+      
+      if (area->external_routing != OSPF_AREA_NSSA)
+	continue;  /* skip if not Nssa Area */
+
+      if (IS_DEBUG_OSPF_NSSA)
+	zlog_info ("ospf_abr_process_nssa_translates(): "
+		   "looking at area %s", inet_ntoa (area->area_id));
+      
+      foreach_lsa (NSSA_LSDB (area), area, 0, ospf_abr_translate_nssa);
+    }
+ 
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("ospf_abr_process_nssa_translates(): Stop");
+
+}
+#endif /* HAVE_NSSA */
+
+void
+ospf_abr_process_network_rt (struct route_table *rt)
+{
+  struct route_node *rn;
+  struct ospf_route *or;
+  struct ospf_area *area;
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_process_network_rt(): Start");
+
+  for (rn = route_top (rt); rn; rn = route_next (rn))
+    {
+      if ((or = rn->info) == NULL)
+	continue;
+
+      if (!(area = ospf_area_lookup_by_area_id (or->u.std.area_id)))
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info ("ospf_abr_process_network_rt(): area %s no longer exists",
+		       inet_ntoa (or->u.std.area_id));
+	  continue;
+	}
+
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_process_network_rt(): this is a route to %s/%d",
+		   inet_ntoa (rn->p.u.prefix4), rn->p.prefixlen);
+      if (or->path_type >= OSPF_PATH_TYPE1_EXTERNAL)
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info ("ospf_abr_process_network_rt(): "
+		       "this is an External router, skipping");
+	  continue;
+	}
+
+      if (or->cost >= OSPF_LS_INFINITY)
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info ("ospf_abr_process_network_rt():"
+		       " this route's cost is infinity, skipping");
+	  continue;
+	}
+
+      if (or->type == OSPF_DESTINATION_DISCARD)
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info ("ospf_abr_process_network_rt():"
+		       " this is a discard entry, skipping");
+	  continue;
+	}
+
+      if (or->path_type == OSPF_PATH_INTRA_AREA &&
+	  !ospf_abr_should_announce (&rn->p, or))
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info("ospf_abr_process_network_rt(): denied by export-list");
+	  continue;
+	}
+
+      if (or->path_type == OSPF_PATH_INTRA_AREA &&
+	  !ospf_abr_plist_out_check (area, or, &rn->p))
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info("ospf_abr_process_network_rt(): denied by prefix-list");
+	  continue;
+	}
+
+      if ((or->path_type == OSPF_PATH_INTER_AREA) &&
+          !OSPF_IS_AREA_ID_BACKBONE (or->u.std.area_id))
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info ("ospf_abr_process_network_rt():"
+		       " this is route is not backbone one, skipping");
+	  continue;
+	}
+
+
+      if ((ospf_top->abr_type == OSPF_ABR_CISCO) ||
+          (ospf_top->abr_type == OSPF_ABR_IBM))
+
+          if (!ospf_act_bb_connection () &&
+              or->path_type != OSPF_PATH_INTRA_AREA)
+	     {
+	       if (IS_DEBUG_OSPF_EVENT)
+		 zlog_info ("ospf_abr_process_network_rt(): ALT ABR: "
+			    "No BB connection, skip not intra-area routes");
+	       continue;
+	     }
+
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_process_network_rt(): announcing");
+      ospf_abr_announce_network (rn, or);
+    }
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_process_network_rt(): Stop");
+}
+
+void
+ospf_abr_announce_rtr_to_area (struct prefix_ipv4 *p, u_int32_t cost,
+			       struct ospf_area *area)
+{
+  struct ospf_lsa *lsa, *old = NULL;
+  struct summary_lsa *slsa = NULL;
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_announce_rtr_to_area(): Start");
+
+  old = OSPF_SUMMARY_ASBR_LSA_SELF_FIND_BY_PREFIX (area, p);
+  /* old = ospf_find_self_summary_asbr_lsa_by_prefix (area, p); */
+
+  if (old)
+    {
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_announce_rtr_to_area(): old summary found");
+      slsa = (struct summary_lsa *) old->data;
+
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_announce_network_to_area(): "
+		   "old metric: %d, new metric: %d",
+		   GET_METRIC (slsa->metric), cost);
+    }
+
+  if (old && (GET_METRIC (slsa->metric) == cost))
+    {
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_announce_rtr_to_area(): old summary approved");
+      SET_FLAG (old->flags, OSPF_LSA_APPROVED);
+    }
+  else
+    {
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_announce_rtr_to_area(): 2.2");
+       
+      if (old) 
+	{ 
+	  set_metric (old, cost);
+	  lsa = ospf_summary_asbr_lsa_refresh (old);
+	}
+      else
+	lsa = ospf_summary_asbr_lsa_originate (p, cost, area);
+
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_announce_rtr_to_area(): "
+		   "flooding new version of summary");
+      /*
+      zlog_info ("ospf_abr_announce_rtr_to_area(): creating new summary");
+      lsa = ospf_summary_asbr_lsa (p, cost, area, old); */
+
+      SET_FLAG (lsa->flags, OSPF_LSA_APPROVED);
+      /* ospf_flood_through_area (area, NULL, lsa);*/
+    }
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_announce_rtr_to_area(): Stop");
+}
+
+
+void
+ospf_abr_announce_rtr (struct prefix_ipv4 *p, struct ospf_route *or)
+{
+  listnode node;
+  struct ospf_area *area;
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_announce_rtr(): Start");
+
+  for (node = listhead (ospf_top->areas); node; nextnode (node))
+    {
+      area = getdata (node);
+
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_announce_rtr(): looking at area %s",
+		   inet_ntoa (area->area_id));
+
+      if (IPV4_ADDR_SAME (&or->u.std.area_id, &area->area_id))
+	continue;
+
+      if (ospf_abr_nexthops_belong_to_area (or, area))
+	continue;
+
+      if (area->external_routing != OSPF_AREA_DEFAULT)
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info ("ospf_abr_announce_network(): "
+		       "area %s doesn't support external routing",
+		       inet_ntoa(area->area_id));
+          continue;
+	}
+
+      if (or->path_type == OSPF_PATH_INTER_AREA)
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info ("ospf_abr_announce_rtr(): "
+		       "this is inter-area route to %s", inet_ntoa (p->prefix));
+          if (!OSPF_IS_AREA_BACKBONE (area))
+	    ospf_abr_announce_rtr_to_area (p, or->cost, area);
+	}
+
+      if (or->path_type == OSPF_PATH_INTRA_AREA)
+	{
+	  if (IS_DEBUG_OSPF_EVENT)
+	    zlog_info ("ospf_abr_announce_rtr(): "
+		       "this is intra-area route to %s", inet_ntoa (p->prefix));
+          ospf_abr_announce_rtr_to_area (p, or->cost, area);
+	}
+    }
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_announce_rtr(): Stop");
+}
+
+void
+ospf_abr_process_router_rt (struct route_table *rt)
+{
+  struct route_node *rn;
+  struct ospf_route *or;
+  struct list *l;
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_process_router_rt(): Start");
+
+  for (rn = route_top (rt); rn; rn = route_next (rn))
+    {
+      listnode node;
+      char flag = 0;
+      struct ospf_route *best = NULL;
+
+      if (rn->info == NULL)
+	continue;
+
+      l = rn->info;
+
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_process_router_rt(): this is a route to %s",
+		   inet_ntoa (rn->p.u.prefix4));
+
+      for (node = listhead (l); node; nextnode (node))
+	{
+	  or = getdata (node);
+	  if (or == NULL)
+	    continue;
+
+	  if (!ospf_area_lookup_by_area_id (or->u.std.area_id))
+	    {
+	      if (IS_DEBUG_OSPF_EVENT)
+		zlog_info ("ospf_abr_process_router_rt(): area %s no longer exists",
+			 inet_ntoa (or->u.std.area_id));
+	      continue;
+	    }
+
+
+	  if (!CHECK_FLAG (or->u.std.flags, ROUTER_LSA_EXTERNAL))
+	    {
+	      if (IS_DEBUG_OSPF_EVENT)
+		zlog_info ("ospf_abr_process_router_rt(): "
+			   "This is not an ASBR, skipping");
+	      continue;
+	    }
+
+	  if (!flag)
+	    {
+	      best = ospf_find_asbr_route (rt, (struct prefix_ipv4 *) &rn->p);
+	      flag = 1;
+	    }
+	  
+        if (best == NULL)
+	  continue;
+	
+        if (or != best)
+	  {
+	    if (IS_DEBUG_OSPF_EVENT)
+	      zlog_info ("ospf_abr_process_router_rt(): "
+			 "This route is not the best among possible, skipping");
+	    continue;
+	  }
+	
+        if (or->path_type == OSPF_PATH_INTER_AREA &&
+            !OSPF_IS_AREA_ID_BACKBONE (or->u.std.area_id))
+	  {
+	    if (IS_DEBUG_OSPF_EVENT)
+	      zlog_info ("ospf_abr_process_router_rt(): "
+			 "This route is not a backbone one, skipping");
+	    continue;
+	  }
+
+        if (or->cost >= OSPF_LS_INFINITY)
+	  {
+	    if (IS_DEBUG_OSPF_EVENT)
+	      zlog_info ("ospf_abr_process_router_rt(): "
+			 "This route has LS_INFINITY metric, skipping");
+	    continue;
+	  }
+
+        if (ospf_top->abr_type == OSPF_ABR_CISCO ||
+            ospf_top->abr_type == OSPF_ABR_IBM)
+	  if (!ospf_act_bb_connection () &&
+	      or->path_type != OSPF_PATH_INTRA_AREA)
+	    {
+	      if (IS_DEBUG_OSPF_EVENT)
+		zlog_info("ospf_abr_process_network_rt(): ALT ABR: "
+			  "No BB connection, skip not intra-area routes");
+	      continue;
+	    }
+
+        ospf_abr_announce_rtr ((struct prefix_ipv4 *) &rn->p, or);
+
+	}
+
+    }
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_process_router_rt(): Stop");
+}
+
+#ifdef HAVE_NSSA
+int
+ospf_abr_unapprove_translates_apply (struct ospf_lsa *lsa, void *p_arg,
+				    int int_arg)
+{
+  /* Could be a mix of Normal Type-5's, self-originated, or Type-7s
+      that are Locally ABR Translated */
+
+  if (CHECK_FLAG (lsa->flags, OSPF_LSA_LOCAL_XLT))
+    UNSET_FLAG (lsa->flags, OSPF_LSA_APPROVED);
+  
+  return 0;
+}
+
+void
+ospf_abr_unapprove_translates () /* For NSSA Translations */
+{
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("ospf_abr_unapprove_translates(): Start");
+
+  /* NSSA Translator is not checked, because it may have gone away,
+    and we would want to flush any residuals anyway */
+
+  foreach_lsa (EXTERNAL_LSDB (ospf_top), NULL, 0,
+	       ospf_abr_unapprove_translates_apply);
+
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("ospf_abr_unapprove_translates(): Stop");
+}
+#endif /* HAVE_NSSA */
+
+int
+ospf_abr_unapprove_summaries_apply (struct ospf_lsa *lsa, void *p_arg,
+				    int int_arg)
+{
+  if (ospf_lsa_is_self_originated (lsa))
+    UNSET_FLAG (lsa->flags, OSPF_LSA_APPROVED);
+
+  return 0;
+}
+
+void
+ospf_abr_unapprove_summaries ()
+{
+  listnode node;
+  struct ospf_area *area;
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_unapprove_summaries(): Start");
+
+  for (node = listhead (ospf_top->areas); node; nextnode (node))
+    {
+      area = getdata (node);
+      foreach_lsa (SUMMARY_LSDB (area), NULL, 0,
+		   ospf_abr_unapprove_summaries_apply);
+      foreach_lsa (ASBR_SUMMARY_LSDB (area), NULL, 0,
+		   ospf_abr_unapprove_summaries_apply);
+    }
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_unapprove_summaries(): Stop");
+}
+
+void
+ospf_abr_prepare_aggregates ()
+{
+  listnode node;
+  struct route_node *rn;
+  struct ospf_area_range *range;
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_prepare_aggregates(): Start");
+
+  for (node = listhead (ospf_top->areas); node; nextnode (node))
+    {
+      struct ospf_area *area = getdata (node);
+
+      for (rn = route_top (area->ranges); rn; rn = route_next (rn))
+	if ((range = rn->info) != NULL)
+	  {
+	    range->cost = 0;
+	    range->specifics = 0;
+	  }
+    }
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_prepare_aggregates(): Stop");
+}
+
+void
+ospf_abr_announce_aggregates ()
+{
+  struct ospf_area *area, *ar;
+  struct ospf_area_range *range;
+  struct route_node *rn;
+  struct prefix_ipv4 p;
+  listnode node, n;
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_announce_aggregates(): Start");
+
+  for (node = listhead (ospf_top->areas); node; nextnode (node))
+    {
+      area = getdata (node);
+
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_announce_aggregates(): looking at area %s",
+		   inet_ntoa (area->area_id));
+
+      for (rn = route_top (area->ranges); rn; rn = route_next (rn))
+	if ((range =  rn->info))
+	  {
+	    if (!CHECK_FLAG (range->flags, OSPF_AREA_RANGE_ADVERTISE))
+	      {
+		if (IS_DEBUG_OSPF_EVENT)
+		  zlog_info ("ospf_abr_announce_aggregates():"
+			     " discarding suppress-ranges");
+		continue;
+	      }
+
+	    p.family = AF_INET;
+	    p.prefix = range->addr;
+	    p.prefixlen = range->masklen;
+
+	    if (IS_DEBUG_OSPF_EVENT)
+	      zlog_info ("ospf_abr_announce_aggregates():"
+			 " this is range: %s/%d",
+			 inet_ntoa (p.prefix), p.prefixlen);
+
+	    if (CHECK_FLAG (range->flags, OSPF_AREA_RANGE_SUBSTITUTE))
+	      {
+		p.family = AF_INET;
+		p.prefix = range->subst_addr;
+		p.prefixlen = range->subst_masklen;
+	      }
+
+	    if (range->specifics)
+	      {
+		if (IS_DEBUG_OSPF_EVENT)
+		  zlog_info ("ospf_abr_announce_aggregates(): active range");
+
+		for (n = listhead (ospf_top->areas); n; nextnode (n))
+		  {
+		    ar = getdata (n);
+		    if (ar == area)
+		      continue;
+
+		    /* We do not check nexthops here, because
+		       intra-area routes can be associated with
+		       one area only */
+
+		    /* backbone routes are not summarized
+		       when announced into transit areas */
+
+		    if (ospf_area_is_transit (ar) &&
+			OSPF_IS_AREA_BACKBONE (area))
+		      {
+			if (IS_DEBUG_OSPF_EVENT)
+			  zlog_info ("ospf_abr_announce_aggregates(): Skipping "
+				     "announcement of BB aggregate into"
+				     " a transit area");
+			continue; 
+		      }
+		    ospf_abr_announce_network_to_area (&p, range->cost, ar);
+		  }
+	      }
+	  }
+    }
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_announce_aggregates(): Stop");
+}
+
+#ifdef HAVE_NSSA
+void
+ospf_abr_send_nssa_aggregates () /* temporarily turned off */
+{
+  listnode node; /*, n; */
+  struct ospf_area *area; /*, *ar; */
+  struct route_node *rn;
+  struct ospf_area_range *range;
+  struct prefix_ipv4 p;
+
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("ospf_abr_send_nssa_aggregates(): Start");
+
+  for (node = listhead (ospf_top->areas); node; nextnode (node))
+    {
+      area = getdata (node);
+
+      if (! area->NSSATranslator)
+	continue;
+
+      if (IS_DEBUG_OSPF_NSSA)
+	zlog_info ("ospf_abr_send_nssa_aggregates(): looking at area %s",
+		   inet_ntoa (area->area_id));
+
+      for (rn = route_top (area->ranges); rn; rn = route_next (rn))
+	{
+          if (rn->info == NULL)
+	    continue;
+
+	  range = rn->info;
+
+          if (!CHECK_FLAG (range->flags, OSPF_AREA_RANGE_ADVERTISE))
+	    {
+	      if (IS_DEBUG_OSPF_NSSA)
+		zlog_info ("ospf_abr_send_nssa_aggregates():"
+			   " discarding suppress-ranges");
+	      continue;
+	    }
+
+          p.family = AF_INET;
+          p.prefix = range->addr;
+          p.prefixlen = range->masklen;
+
+	  if (IS_DEBUG_OSPF_NSSA)
+	    zlog_info ("ospf_abr_send_nssa_aggregates():"
+		       " this is range: %s/%d",
+		       inet_ntoa (p.prefix), p.prefixlen);
+
+          if (CHECK_FLAG (range->flags, OSPF_AREA_RANGE_SUBSTITUTE))
+	    {
+	      p.family = AF_INET;
+	      p.prefix = range->subst_addr;
+	      p.prefixlen = range->subst_masklen;
+	    }
+
+          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*/
+    } /* all areas */
+
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("ospf_abr_send_nssa_aggregates(): Stop");
+}
+
+void
+ospf_abr_announce_nssa_defaults () /* By ABR-Translator */
+{
+  listnode node;
+  struct ospf_area *area;
+  struct prefix_ipv4 p;
+
+  if (! OSPF_IS_ABR)
+    return;
+
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("ospf_abr_announce_stub_defaults(): Start");
+
+  p.family = AF_INET;
+  p.prefix.s_addr = OSPF_DEFAULT_DESTINATION;
+  p.prefixlen = 0;
+
+  for (node = listhead (ospf_top->areas); node; nextnode (node))
+    {
+      area = getdata (node);
+      if (IS_DEBUG_OSPF_NSSA)
+	zlog_info ("ospf_abr_announce_nssa_defaults(): looking at area %s",
+		   inet_ntoa (area->area_id));
+
+      if (area->external_routing != OSPF_AREA_NSSA)
+	continue;
+
+      if (OSPF_IS_AREA_BACKBONE (area))
+	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); */
+	}
+    }
+}
+#endif /* HAVE_NSSA */
+
+void
+ospf_abr_announce_stub_defaults ()
+{
+  listnode node;
+  struct ospf_area *area;
+  struct prefix_ipv4 p;
+
+  if (! OSPF_IS_ABR)
+    return;
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_announce_stub_defaults(): Start");
+
+  p.family = AF_INET;
+  p.prefix.s_addr = OSPF_DEFAULT_DESTINATION;
+  p.prefixlen = 0;
+
+  for (node = listhead (ospf_top->areas); node; nextnode (node))
+    {
+      area = getdata (node);
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_announce_stub_defaults(): looking at area %s",
+		   inet_ntoa (area->area_id));
+
+#ifdef HAVE_NSSA
+      if (area->external_routing != OSPF_AREA_STUB)
+#else /* ! HAVE_NSSA */
+      if (area->external_routing == OSPF_AREA_DEFAULT)
+#endif /* HAVE_NSSA */
+	continue;
+
+      if (OSPF_IS_AREA_BACKBONE (area))
+	continue; /* Sanity Check */
+
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_announce_stub_defaults(): "
+		   "announcing 0.0.0.0/0 to this area");
+      ospf_abr_announce_network_to_area (&p, area->default_cost, area);
+    }
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_announce_stub_defaults(): Stop");
+}
+
+#ifdef HAVE_NSSA
+int
+ospf_abr_remove_unapproved_translates_apply (struct ospf_lsa *lsa, void *p_arg,
+					     int int_arg)
+{
+  if (CHECK_FLAG (lsa->flags, OSPF_LSA_LOCAL_XLT)
+      && ! CHECK_FLAG (lsa->flags, OSPF_LSA_APPROVED))
+    {
+      zlog_info ("ospf_abr_remove_unapproved_translates(): "
+		 "removing unapproved translates, ID: %s",
+		 inet_ntoa (lsa->data->id));
+
+      /* FLUSH THROUGHOUT AS */
+      ospf_lsa_flush_as (lsa);
+
+      /* DISCARD from LSDB  */
+    }
+  return 0;
+}
+
+void
+ospf_abr_remove_unapproved_translates () /* For NSSA Translations */
+{
+  /* All AREA PROCESS should have APPROVED necessary LSAs */
+  /* Remove any left over and not APPROVED */
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("ospf_abr_remove_unapproved_translates(): Start");
+
+  foreach_lsa (EXTERNAL_LSDB (ospf_top), NULL, 0,
+	       ospf_abr_remove_unapproved_translates_apply);
+ 
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("ospf_abr_remove_unapproved_translates(): Stop");
+}
+#endif /* HAVE_NSSA */
+
+int
+ospf_abr_remove_unapproved_summaries_apply (struct ospf_lsa *lsa, void *p_arg,
+					    int int_arg)
+{
+  struct ospf_area *area;
+
+  area = (struct ospf_area *) p_arg;
+
+  if (ospf_lsa_is_self_originated (lsa) &&
+      !CHECK_FLAG (lsa->flags, OSPF_LSA_APPROVED))
+    {
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_remove_unapproved_summaries(): "
+		   "removing unapproved summary, ID: %s",
+		   inet_ntoa (lsa->data->id));
+      ospf_lsa_flush_area (lsa, area);
+    }
+  return 0;
+}
+
+void
+ospf_abr_remove_unapproved_summaries ()
+{
+  listnode node;
+  struct ospf_area *area;
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_remove_unapproved_summaries(): Start");
+
+  for (node = listhead (ospf_top->areas); node; nextnode (node))
+    {
+      area = getdata (node);
+
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_remove_unapproved_summaries(): "
+		   "looking at area %s", inet_ntoa (area->area_id));
+
+      foreach_lsa (SUMMARY_LSDB (area), area, 0,
+		   ospf_abr_remove_unapproved_summaries_apply);
+      foreach_lsa (ASBR_SUMMARY_LSDB (area), area, 0,
+		   ospf_abr_remove_unapproved_summaries_apply);
+    }
+ 
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_remove_unapproved_summaries(): Stop");
+}
+
+void
+ospf_abr_manage_discard_routes ()
+{
+  listnode node;
+  struct route_node *rn;
+  struct ospf_area *area;
+  struct ospf_area_range *range;
+
+  for (node = listhead (ospf_top->areas); node; nextnode (node))
+    if ((area = node->data) != NULL)
+      for (rn = route_top (area->ranges); rn; rn = route_next (rn))
+	if ((range = rn->info) != NULL)
+	  if (CHECK_FLAG (range->flags, OSPF_AREA_RANGE_ADVERTISE))
+	    {
+	      if (range->specifics)
+		ospf_add_discard_route (ospf_top->new_table, area,
+					(struct prefix_ipv4 *) &rn->p);
+	      else
+		ospf_delete_discard_route ((struct prefix_ipv4 *) &rn->p);
+	    }
+}
+
+#ifdef HAVE_NSSA
+/* This is the function taking care about ABR NSSA, i.e.  NSSA
+   Translator, -LSA aggregation and flooding. For all NSSAs
+
+   Any SELF-AS-LSA is in the Type-5 LSDB and Type-7 LSDB.  These LSA's
+   are refreshed from the Type-5 LSDB, installed into the Type-7 LSDB
+   with the P-bit set.
+
+   Any received Type-5s are legal for an ABR, else illegal for IR.
+   Received Type-7s are installed, by area, with incoming P-bit.  They
+   are flooded; if the Elected NSSA Translator, then P-bit off.
+
+   Additionally, this ABR will place "translated type-7's" into the
+   Type-5 LSDB in order to keep track of APPROVAL or not.
+
+   It will scan through every area, looking for Type-7 LSAs with P-Bit
+   SET. The Type-7's are either AS-FLOODED & 5-INSTALLED or
+   AGGREGATED.  Later, the AGGREGATED LSAs are AS-FLOODED &
+   5-INSTALLED.
+
+   5-INSTALLED is into the Type-5 LSDB; Any UNAPPROVED Type-5 LSAs
+   left over are FLUSHED and DISCARDED.
+
+   For External Calculations, any NSSA areas use the Type-7 AREA-LSDB,
+   any ABR-non-NSSA areas use the Type-5 GLOBAL-LSDB. */
+
+void
+ospf_abr_nssa_task () /* called only if any_nssa */
+{
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("Check for NSSA-ABR Tasks():");
+
+  if (! OSPF_IS_ABR)
+    return;
+
+  if (! ospf_top->anyNSSA)
+    return;
+
+  /* Each area must confirm TranslatorRole */
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("ospf_abr_nssa_task(): Start");
+
+  /* For all Global Entries flagged "local-translate", unset APPROVED */
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("ospf_abr_nssa_task(): unapprove translates");
+
+  ospf_abr_unapprove_translates ();
+
+  /* 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 */
+
+  /* For all NSSAs, Type-7s, translate to 5's, INSTALL/FLOOD, or
+     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_top->new_table);
+
+  /* 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 */
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info("ospf_abr_nssa_task(): send NSSA aggregates");
+  /*       ospf_abr_send_nssa_aggregates ();  TURNED OFF FOR NOW */
+
+  /* Send any NSSA defaults as Type-5 */
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("ospf_abr_nssa_task(): announce nssa defaults");
+  ospf_abr_announce_nssa_defaults ();
+   
+  /* Flush any unapproved previous translates from Global Data Base */
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("ospf_abr_nssa_task(): remove unapproved translates");
+  ospf_abr_remove_unapproved_translates ();
+
+  ospf_abr_manage_discard_routes (); /* same as normal...discard */
+
+  if (IS_DEBUG_OSPF_NSSA)
+    zlog_info ("ospf_abr_nssa_task(): Stop");
+}
+#endif /* HAVE_NSSA */
+
+/* This is the function taking care about ABR stuff, i.e.
+   summary-LSA origination and flooding. */
+void
+ospf_abr_task ()
+{
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_task(): Start");
+
+  if (ospf_top->new_table == NULL || ospf_top->new_rtrs == NULL)
+    {
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_task(): Routing tables are not yet ready");
+      return;
+    }
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_task(): unapprove summaries");
+  ospf_abr_unapprove_summaries ();
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_task(): prepare aggregates");
+  ospf_abr_prepare_aggregates ();
+
+  if (OSPF_IS_ABR)
+    {
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_task(): process network RT");
+      ospf_abr_process_network_rt (ospf_top->new_table);
+
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_task(): process router RT");
+      ospf_abr_process_router_rt (ospf_top->new_rtrs);
+
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_task(): announce aggregates");
+      ospf_abr_announce_aggregates ();
+
+      if (IS_DEBUG_OSPF_EVENT)
+	zlog_info ("ospf_abr_task(): announce stub defaults");
+      ospf_abr_announce_stub_defaults ();
+    }
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_task(): remove unapproved summaries");
+  ospf_abr_remove_unapproved_summaries ();
+
+  ospf_abr_manage_discard_routes ();
+
+#ifdef HAVE_NSSA
+  ospf_abr_nssa_task(); /* if nssa-abr, then scan Type-7 LSDB */
+#endif /* HAVE_NSSA */
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("ospf_abr_task(): Stop");
+}
+
+
+int
+ospf_abr_task_timer (struct thread *t)
+{
+  ospf_top->t_abr_task = 0;
+
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("Running ABR task on timer");
+
+  ospf_check_abr_status ();
+
+  ospf_abr_task ();
+
+ return 0;
+}
+
+void
+ospf_schedule_abr_task ()
+{
+  if (IS_DEBUG_OSPF_EVENT)
+    zlog_info ("Scheduling ABR task");
+  if (! ospf_top->t_abr_task)
+    ospf_top->t_abr_task = thread_add_timer (master, ospf_abr_task_timer,
+					     0, OSPF_ABR_TASK_DELAY);
+}