diff --git a/ospf6d/ospf6_flood.c b/ospf6d/ospf6_flood.c
new file mode 100644
index 0000000..e049455
--- /dev/null
+++ b/ospf6d/ospf6_flood.c
@@ -0,0 +1,861 @@
+/*
+ * Copyright (C) 2003 Yasuhiro Ohara
+ *
+ * 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 "log.h"
+#include "thread.h"
+#include "linklist.h"
+#include "vty.h"
+
+#include "ospf6d.h"
+#include "ospf6_proto.h"
+#include "ospf6_lsa.h"
+#include "ospf6_lsdb.h"
+#include "ospf6_message.h"
+#include "ospf6_route.h"
+#include "ospf6_spf.h"
+
+#include "ospf6_top.h"
+#include "ospf6_area.h"
+#include "ospf6_interface.h"
+#include "ospf6_neighbor.h"
+
+
+void *
+ospf6_get_lsa_scope (u_int16_t type, struct ospf6_neighbor *from)
+{
+  void *scope = NULL;
+
+  if (from == NULL)
+    return NULL;
+
+  switch (OSPF6_LSA_SCOPE (type))
+    {
+      case OSPF6_LSA_SCOPE_AS:
+        scope = (from)->ospf6_if->area->ospf6;
+        break;
+      case OSPF6_LSA_SCOPE_AREA:
+        scope = (from)->ospf6_if->area;
+        break;
+      case OSPF6_LSA_SCOPE_LINKLOCAL:
+        scope = (from)->ospf6_if;
+        break;
+      default:
+        break;
+    }
+
+  return scope;
+}
+
+struct ospf6_lsdb *
+ospf6_get_scoped_lsdb (u_int16_t type, void *scope)
+{
+  struct ospf6_lsdb *lsdb = NULL;
+
+  if (scope == NULL)
+    return NULL;
+
+  switch (OSPF6_LSA_SCOPE (type))
+    {
+      case OSPF6_LSA_SCOPE_AS:
+        lsdb = ((struct ospf6 *)(scope))->lsdb;
+        break;
+      case OSPF6_LSA_SCOPE_AREA:
+        lsdb = ((struct ospf6_area *)(scope))->lsdb;
+        break;
+      case OSPF6_LSA_SCOPE_LINKLOCAL:
+        lsdb = ((struct ospf6_interface *)(scope))->lsdb;
+        break;
+      default:
+        break;
+    }
+
+  return lsdb;
+}
+
+void
+ospf6_flood_clear (struct ospf6_lsa *lsa)
+{
+  struct ospf6_neighbor *on;
+  struct ospf6_interface *oi, *ospf6_if = NULL;
+  struct ospf6_area *oa, *area = NULL;
+  struct ospf6 *ospf6 = NULL;
+  u_int16_t scope_type;
+  list scoped_interfaces;
+  struct ospf6_lsa *rxmt;
+  listnode i, j;
+
+  scoped_interfaces = list_new ();
+  scope_type = OSPF6_LSA_SCOPE (lsa->header->type);
+
+  if (scope_type == OSPF6_LSA_SCOPE_LINKLOCAL)
+    {
+      ospf6_if = (struct ospf6_interface *) lsa->scope;
+      area = ospf6_if->area;
+      ospf6 = area->ospf6;
+    }
+  else if (scope_type == OSPF6_LSA_SCOPE_AREA)
+    {
+      area = (struct ospf6_area *) lsa->scope;
+      ospf6 = area->ospf6;
+    }
+  else if (scope_type == OSPF6_LSA_SCOPE_AS)
+    {
+      ospf6 = (struct ospf6 *) lsa->scope;
+    }
+  else
+    {
+      zlog_warn ("Can't decide LSA scope, quit ospf6_flood_clear ()");
+      return;
+    }
+
+  /* Collect eligible interfaces */
+  for (i = listhead (ospf6->area_list); i; nextnode (i))
+    {
+      oa = (struct ospf6_area *) getdata (i);
+      if (scope_type != OSPF6_LSA_SCOPE_AS && oa != area)
+        continue;
+
+      for (j = listhead (oa->if_list); j; nextnode (j))
+        {
+          oi = (struct ospf6_interface *) getdata (j);
+          if (scope_type != OSPF6_LSA_SCOPE_AS &&
+              scope_type != OSPF6_LSA_SCOPE_AREA && oi != ospf6_if)
+            continue;
+
+          listnode_add (scoped_interfaces, oi);
+        }
+    }
+
+  for (i = listhead (scoped_interfaces); i; nextnode (i))
+    {
+      oi = (struct ospf6_interface *) getdata (i);
+      for (j = listhead (oi->neighbor_list); j; nextnode (j))
+        {
+          on = (struct ospf6_neighbor *) getdata (j);
+          rxmt = ospf6_lsdb_lookup (lsa->header->type, lsa->header->id,
+                                    lsa->header->adv_router, on->retrans_list);
+          if (rxmt && ! ospf6_lsa_compare (rxmt, lsa))
+            {
+              if (IS_OSPF6_DEBUG_LSA (DATABASE))
+                zlog_info ("Remove %s from retrans_list of %s",
+                           rxmt->name, on->name);
+              ospf6_lsdb_remove (rxmt, on->retrans_list);
+            }
+        }
+    }
+
+  list_delete (scoped_interfaces);
+}
+
+/* RFC2328 section 13.2 Installing LSAs in the database */
+void
+ospf6_install_lsa (struct ospf6_lsa *lsa, struct ospf6_lsdb *lsdb)
+{
+  struct ospf6_lsa *old;
+
+  if (IS_OSPF6_DEBUG_LSA (RECV) || IS_OSPF6_DEBUG_LSA (DATABASE))
+    zlog_info ("Install LSA: %s", lsa->name);
+
+  /* Remove the old instance from all neighbors' Link state
+     retransmission list (RFC2328 13.2 last paragraph) */
+  old = ospf6_lsdb_lookup (lsa->header->type, lsa->header->id,
+                           lsa->header->adv_router, lsdb);
+  if (old)
+    ospf6_flood_clear (old);
+
+  /* actually install */
+  gettimeofday (&lsa->installed, (struct timezone *) NULL);
+  ospf6_lsdb_add (lsa, lsdb);
+
+  return;
+}
+
+/* RFC2328 section 13.3 Next step in the flooding procedure */
+void
+ospf6_flood_lsa (struct ospf6_lsa *lsa, struct ospf6_neighbor *from)
+{
+  struct ospf6 *scope_as = NULL;
+  struct ospf6_area *oa, *scope_area = NULL;
+  struct ospf6_interface *oi, *scope_linklocal = NULL;
+  struct ospf6_neighbor *on;
+  list eligible_interfaces;
+  listnode i, j;
+  u_int16_t scope_type;
+  struct ospf6_lsa *req;
+  int retrans_added = 0;
+
+  scope_type = OSPF6_LSA_SCOPE (lsa->header->type);
+  switch (scope_type)
+    {
+      case OSPF6_LSA_SCOPE_AS:
+        scope_as = (struct ospf6 *) lsa->scope;
+        break;
+      case OSPF6_LSA_SCOPE_AREA:
+        scope_as = ((struct ospf6_area *) lsa->scope)->ospf6;
+        scope_area = (struct ospf6_area *) lsa->scope;
+        break;
+      case OSPF6_LSA_SCOPE_LINKLOCAL:
+        scope_as = ((struct ospf6_interface *) lsa->scope)->area->ospf6;
+        scope_area = ((struct ospf6_interface *) lsa->scope)->area;
+        scope_linklocal = (struct ospf6_interface *) lsa->scope;
+        break;
+      default:
+        if (IS_OSPF6_DEBUG_LSA (SEND))
+          zlog_info ("Can't decide LSA scope");
+        return;
+    }
+
+  if (IS_OSPF6_DEBUG_LSA (SEND))
+    zlog_info ("Flood %s", lsa->name);
+
+  /* Collect eligible interfaces */
+  eligible_interfaces = list_new ();
+  for (i = listhead (scope_as->area_list); i; nextnode (i))
+    {
+      oa = (struct ospf6_area *) getdata (i);
+      if (scope_type != OSPF6_LSA_SCOPE_AS &&
+          oa != scope_area)
+        continue;
+
+      for (j = listhead (oa->if_list); j; nextnode (j))
+        {
+          oi = (struct ospf6_interface *) getdata (j);
+          if (scope_type != OSPF6_LSA_SCOPE_AS &&
+              scope_type != OSPF6_LSA_SCOPE_AREA &&
+              oi != scope_linklocal)
+            continue;
+
+          listnode_add (eligible_interfaces, oi);
+        }
+    }
+
+  /* For each eligible interface: */
+  for (i = listhead (eligible_interfaces); i; nextnode (i))
+    {
+      oi = (struct ospf6_interface *) getdata (i);
+
+      /* (1) For each neighbor */
+      for (j = listhead (oi->neighbor_list); j; nextnode (j))
+        {
+          on = (struct ospf6_neighbor *) getdata (j);
+
+          /* (a) if neighbor state < Exchange, examin next */
+          if (on->state < OSPF6_NEIGHBOR_EXCHANGE)
+            continue;
+
+          /* (b) if neighbor not yet Full, check request-list */
+          if (on->state != OSPF6_NEIGHBOR_FULL)
+            {
+              req = ospf6_lsdb_lookup (lsa->header->type, lsa->header->id,
+                                       lsa->header->adv_router,
+                                       on->request_list);
+              if (req)
+                {
+                  /* If new LSA less recent, examin next neighbor */
+                  if (ospf6_lsa_compare (lsa, req) > 0)
+                    continue;
+
+                  /* If the same instance, delete from request-list and
+                     examin next neighbor */
+                  if (ospf6_lsa_compare (lsa, req) == 0)
+                    {
+                      if (IS_OSPF6_DEBUG_LSA (SEND) || IS_OSPF6_DEBUG_LSA (DATABASE))
+                        zlog_info ("Remove %s from request-list of %s: "
+                                   "the same instance", req->name, on->name);
+                      ospf6_lsdb_remove (req, on->request_list);
+                      continue;
+                    }
+
+                  /* If the new LSA is more recent, delete from
+                     request-list */
+                  if (ospf6_lsa_compare (lsa, req) < 0)
+                    {
+                      if (IS_OSPF6_DEBUG_LSA (SEND) || IS_OSPF6_DEBUG_LSA (DATABASE))
+                        zlog_info ("Remove %s from request-list of %s: "
+                                   "newer instance", req->name, on->name);
+                      ospf6_lsdb_remove (req, on->request_list);
+                      /* fall through */
+                    }
+                }
+            }
+
+          /* (c) If the new LSA was received from this neighbor,
+             examin next neighbor */
+          if (from == on)
+            continue;
+
+          /* (d) add retrans-list, schedule retransmission */
+          if (IS_OSPF6_DEBUG_LSA (SEND) || IS_OSPF6_DEBUG_LSA (DATABASE))
+            zlog_info ("  Add copy of %s to retrans-list of %s",
+                       lsa->name, on->name);
+          ospf6_lsdb_add (ospf6_lsa_copy (lsa), on->retrans_list);
+          if (on->thread_send_lsupdate == NULL)
+            on->thread_send_lsupdate =
+              thread_add_event (master, ospf6_lsupdate_send_neighbor,
+                                on, on->ospf6_if->rxmt_interval);
+          retrans_added++;
+        }
+
+      /* (2) examin next interface if not added to retrans-list */
+      if (retrans_added == 0)
+        continue;
+
+      /* (3) If the new LSA was received on this interface,
+         and it was from DR or BDR, examin next interface */
+      if (from && from->ospf6_if == oi &&
+          (from->router_id == oi->drouter || from->router_id == oi->bdrouter))
+        continue;
+
+      /* (4) If the new LSA was received on this interface,
+         and the interface state is BDR, examin next interface */
+      if (from && from->ospf6_if == oi && oi->state == OSPF6_INTERFACE_BDR)
+        continue;
+
+      /* (5) flood the LSA out the interface. */
+      if (if_is_broadcast (oi->interface))
+        {
+          if (IS_OSPF6_DEBUG_LSA (SEND) || IS_OSPF6_DEBUG_LSA (DATABASE))
+            zlog_info ("  Add copy of %s to lsupdate_list of %s",
+                       lsa->name, oi->interface->name);
+          ospf6_lsdb_add (ospf6_lsa_copy (lsa), oi->lsupdate_list);
+          if (oi->thread_send_lsupdate == NULL)
+            oi->thread_send_lsupdate =
+              thread_add_event (master, ospf6_lsupdate_send_interface, oi, 0);
+        }
+      else
+        {
+          for (j = listhead (oi->neighbor_list); j; nextnode (j))
+            {
+              on = (struct ospf6_neighbor *) getdata (j);
+              THREAD_OFF (on->thread_send_lsupdate);
+              on->thread_send_lsupdate =
+                thread_add_event (master, ospf6_lsupdate_send_neighbor, on, 0);
+            }
+        }
+    }
+
+  list_delete (eligible_interfaces);
+}
+
+/* RFC2328 13.5 (Table 19): Sending link state acknowledgements. */
+static void
+ospf6_acknowledge_lsa_bdrouter (struct ospf6_lsa *lsa, int ismore_recent,
+                                struct ospf6_neighbor *from)
+{
+  struct ospf6_interface *oi;
+
+  assert (from && from->ospf6_if);
+  oi = from->ospf6_if;
+
+  /* LSA has been flood back out receiving interface.
+     No acknowledgement sent. */
+  if (CHECK_FLAG (lsa->flag, OSPF6_LSA_FLOODBACK))
+    {
+      if (IS_OSPF6_DEBUG_LSA (RECV))
+        zlog_info ("  BDR, FloodBack, No acknowledgement.");
+      return;
+    }
+
+  /* LSA is more recent than database copy, but was not flooded
+     back out receiving interface. Delayed acknowledgement sent
+     if advertisement received from Designated Router,
+     otherwide do nothing. */
+  if (ismore_recent < 0)
+    {
+      if (IS_OSPF6_DEBUG_LSA (RECV))
+        zlog_info ("  BDR, Not FloodBack, MoreRecent, ");
+      if (oi->drouter == from->router_id)
+        {
+          if (IS_OSPF6_DEBUG_LSA (RECV))
+            zlog_info ("       From DR, Delayed acknowledgement.");
+          /* Delayed acknowledgement */
+          if (IS_OSPF6_DEBUG_LSA (DATABASE))
+            zlog_info ("  Add copy of %s to lsack_list of %s",
+                       lsa->name, oi->interface->name);
+          ospf6_lsdb_add (ospf6_lsa_copy (lsa), oi->lsack_list);
+          if (oi->thread_send_lsack == NULL)
+            oi->thread_send_lsack =
+              thread_add_timer (master, ospf6_lsack_send_interface, oi, 3);
+        }
+      else
+        {
+          if (IS_OSPF6_DEBUG_LSA (RECV))
+            zlog_info ("       Not From DR, No acknowledgement.");
+        }
+      return;
+    }
+
+  /* LSA is a duplicate, and was treated as an implied acknowledgement.
+     Delayed acknowledgement sent if advertisement received from
+     Designated Router, otherwise do nothing */
+  if (CHECK_FLAG (lsa->flag, OSPF6_LSA_DUPLICATE) &&
+      CHECK_FLAG (lsa->flag, OSPF6_LSA_IMPLIEDACK))
+    {
+      if (IS_OSPF6_DEBUG_LSA (RECV))
+        zlog_info ("  BDR, Duplicate, ImpliedAck, ");
+      if (oi->drouter == from->router_id)
+        {
+          if (IS_OSPF6_DEBUG_LSA (RECV))
+            zlog_info ("       From DR, Delayed acknowledgement.");
+          /* Delayed acknowledgement */
+          if (IS_OSPF6_DEBUG_LSA (DATABASE))
+            zlog_info ("  Add copy of %s to lsack_list of %s",
+                       lsa->name, oi->interface->name);
+          ospf6_lsdb_add (ospf6_lsa_copy (lsa), oi->lsack_list);
+          if (oi->thread_send_lsack == NULL)
+            oi->thread_send_lsack =
+              thread_add_timer (master, ospf6_lsack_send_interface, oi, 3);
+        }
+      else
+        {
+          if (IS_OSPF6_DEBUG_LSA (RECV))
+            zlog_info ("       Not From DR, No acknowledgement.");
+        }
+      return;
+    }
+
+  /* LSA is a duplicate, and was not treated as an implied acknowledgement.
+     Direct acknowledgement sent */
+  if (CHECK_FLAG (lsa->flag, OSPF6_LSA_DUPLICATE) &&
+      ! CHECK_FLAG (lsa->flag, OSPF6_LSA_IMPLIEDACK))
+    {
+      if (IS_OSPF6_DEBUG_LSA (RECV))
+        zlog_info ("  BDR, Duplicate, Not ImpliedAck, Direct acknowledgement.");
+      if (IS_OSPF6_DEBUG_LSA (DATABASE))
+        zlog_info ("  Add copy of %s to lsack_list of %s",
+                   lsa->name, from->name);
+      ospf6_lsdb_add (ospf6_lsa_copy (lsa), from->lsack_list);
+      if (from->thread_send_lsack == NULL)
+        from->thread_send_lsack =
+          thread_add_event (master, ospf6_lsack_send_neighbor, from, 0);
+      return;
+    }
+
+  /* LSA's LS age is equal to Maxage, and there is no current instance
+     of the LSA in the link state database, and none of router's
+     neighbors are in states Exchange or Loading */
+  /* Direct acknowledgement sent, but this case is handled in
+     early of ospf6_receive_lsa () */
+}
+
+static void
+ospf6_acknowledge_lsa_allother (struct ospf6_lsa *lsa, int ismore_recent,
+                                struct ospf6_neighbor *from)
+{
+  struct ospf6_interface *oi;
+
+  assert (from && from->ospf6_if);
+  oi = from->ospf6_if;
+
+  /* LSA has been flood back out receiving interface.
+     No acknowledgement sent. */
+  if (CHECK_FLAG (lsa->flag, OSPF6_LSA_FLOODBACK))
+    {
+      if (IS_OSPF6_DEBUG_LSA (RECV))
+        zlog_info ("  AllOther, FloodBack, No acknowledgement.");
+      return;
+    }
+
+  /* LSA is more recent than database copy, but was not flooded
+     back out receiving interface. Delayed acknowledgement sent. */
+  if (ismore_recent < 0)
+    {
+      if (IS_OSPF6_DEBUG_LSA (RECV))
+        zlog_info ("  AllOther, Not FloodBack, Delayed acknowledgement.");
+      /* Delayed acknowledgement */
+      if (IS_OSPF6_DEBUG_LSA (DATABASE))
+        zlog_info ("  Add copy of %s to lsack_list of %s",
+                   lsa->name, oi->interface->name);
+      ospf6_lsdb_add (ospf6_lsa_copy (lsa), oi->lsack_list);
+      if (oi->thread_send_lsack == NULL)
+        oi->thread_send_lsack =
+          thread_add_timer (master, ospf6_lsack_send_interface, oi, 3);
+      return;
+    }
+
+  /* LSA is a duplicate, and was treated as an implied acknowledgement.
+     No acknowledgement sent. */
+  if (CHECK_FLAG (lsa->flag, OSPF6_LSA_DUPLICATE) &&
+      CHECK_FLAG (lsa->flag, OSPF6_LSA_IMPLIEDACK))
+    {
+      if (IS_OSPF6_DEBUG_LSA (RECV))
+        zlog_info ("  AllOther, Duplicate, ImpliedAck, No acknowledgement.");
+      return;
+    }
+
+  /* LSA is a duplicate, and was not treated as an implied acknowledgement.
+     Direct acknowledgement sent */
+  if (CHECK_FLAG (lsa->flag, OSPF6_LSA_DUPLICATE) &&
+      ! CHECK_FLAG (lsa->flag, OSPF6_LSA_IMPLIEDACK))
+    {
+      if (IS_OSPF6_DEBUG_LSA (RECV))
+        zlog_info ("  AllOther, Duplicate, Not ImpliedAck, Direct acknowledgement.");
+      if (IS_OSPF6_DEBUG_LSA (DATABASE))
+        zlog_info ("  Add copy of %s to lsack_list of %s",
+                   lsa->name, from->name);
+      ospf6_lsdb_add (ospf6_lsa_copy (lsa), from->lsack_list);
+      if (from->thread_send_lsack == NULL)
+        from->thread_send_lsack =
+          thread_add_event (master, ospf6_lsack_send_neighbor, from, 0);
+      return;
+    }
+
+  /* LSA's LS age is equal to Maxage, and there is no current instance
+     of the LSA in the link state database, and none of router's
+     neighbors are in states Exchange or Loading */
+  /* Direct acknowledgement sent, but this case is handled in
+     early of ospf6_receive_lsa () */
+}
+
+void
+ospf6_acknowledge_lsa (struct ospf6_lsa *lsa, int ismore_recent,
+                       struct ospf6_neighbor *from)
+{
+  struct ospf6_interface *oi;
+
+  assert (from && from->ospf6_if);
+  oi = from->ospf6_if;
+
+  if (oi->state == OSPF6_INTERFACE_BDR)
+    ospf6_acknowledge_lsa_bdrouter (lsa, ismore_recent, from);
+  else
+    ospf6_acknowledge_lsa_allother (lsa, ismore_recent, from);
+}
+
+/* RFC2328 section 13 (4):
+   if MaxAge LSA and if we have no instance, and no neighbor
+   is in states Exchange or Loading
+   returns 1 if match this case, else returns 0 */
+static int
+ospf6_is_maxage_lsa_drop (struct ospf6_lsa *lsa,
+                          struct ospf6_neighbor *from)
+{
+  struct ospf6_lsdb *lsdb = NULL;
+  struct ospf6_neighbor *on;
+  struct ospf6_interface *oi, *ospf6_if = NULL;
+  struct ospf6_area *oa, *area = NULL;
+  struct ospf6 *ospf6 = NULL;
+  u_int16_t scope_type;
+  list scoped_interfaces;
+  listnode i, j;
+  int count = 0;
+
+  if (! OSPF6_LSA_IS_MAXAGE (lsa))
+    return 0;
+
+  lsdb = ospf6_get_scoped_lsdb (lsa->header->type, lsa->scope);
+  if (lsdb == NULL)
+    {
+      zlog_info ("Can't decide scoped LSDB");
+      return 0;
+    }
+
+  if (ospf6_lsdb_lookup (lsa->header->type, lsa->header->id,
+                         lsa->header->adv_router, lsdb))
+    return 0;
+
+  scoped_interfaces = list_new ();
+  scope_type = OSPF6_LSA_SCOPE (lsa->header->type);
+
+  if (scope_type == OSPF6_LSA_SCOPE_LINKLOCAL)
+    {
+      ospf6_if = (struct ospf6_interface *) lsa->scope;
+      area = ospf6_if->area;
+      ospf6 = area->ospf6;
+    }
+  else if (scope_type == OSPF6_LSA_SCOPE_AREA)
+    {
+      area = (struct ospf6_area *) lsa->scope;
+      ospf6 = area->ospf6;
+    }
+  else if (scope_type == OSPF6_LSA_SCOPE_AS)
+    {
+      ospf6 = (struct ospf6 *) lsa->scope;
+    }
+  else
+    {
+      zlog_info ("Can't decide LSA scope");
+      return 0;
+    }
+
+  /* Collect eligible interfaces */
+  for (i = listhead (ospf6->area_list); i; nextnode (i))
+    {
+      oa = (struct ospf6_area *) getdata (i);
+      if (scope_type != OSPF6_LSA_SCOPE_AS && oa != area)
+        continue;
+
+      for (j = listhead (oa->if_list); j; nextnode (j))
+        {
+          oi = (struct ospf6_interface *) getdata (j);
+          if (scope_type != OSPF6_LSA_SCOPE_AS &&
+              scope_type != OSPF6_LSA_SCOPE_AREA && oi != ospf6_if)
+            continue;
+
+          listnode_add (scoped_interfaces, oi);
+        }
+    }
+
+  for (i = listhead (scoped_interfaces); i; nextnode (i))
+    {
+      oi = (struct ospf6_interface *) getdata (i);
+      for (j = listhead (oi->neighbor_list); j; nextnode (j))
+        {
+          on = (struct ospf6_neighbor *) getdata (j);
+          if (on->state == OSPF6_NEIGHBOR_EXCHANGE ||
+              on->state == OSPF6_NEIGHBOR_LOADING)
+            count ++;
+        }
+    }
+
+  list_delete (scoped_interfaces);
+
+  if (count == 0)
+    return 1;
+
+  return 0;
+}
+
+/* RFC2328 section 13 The Flooding Procedure */
+void
+ospf6_receive_lsa (struct ospf6_lsa_header *lsa_header,
+                   struct ospf6_neighbor *from)
+{
+  struct ospf6_lsa *new = NULL, *old = NULL, *rem = NULL;
+  int ismore_recent;
+  unsigned short cksum;
+  struct ospf6_lsdb *lsdb = NULL;
+
+  ismore_recent = 1;
+
+  /* make lsa structure for received lsa */
+  new = ospf6_lsa_create (lsa_header);
+
+  if (IS_OSPF6_DEBUG_LSA (RECV))
+    {
+      zlog_info ("LSA Receive from %s", from->name);
+      ospf6_lsa_header_print (new);
+    }
+
+  new->scope = ospf6_get_lsa_scope (new->header->type, from);
+  if (new->scope == NULL)
+    {
+      zlog_warn ("Can't decide LSA scope, ignore");
+      ospf6_lsa_delete (new);
+      return;
+    }
+
+  /* (1) LSA Checksum */
+  cksum = ntohs (new->header->checksum);
+  if (ntohs (ospf6_lsa_checksum (new->header)) != cksum)
+    {
+      if (IS_OSPF6_DEBUG_LSA (RECV))
+        zlog_info ("Wrong LSA Checksum");
+      ospf6_lsa_delete (new);
+      return;
+    }
+
+  /* (3) Ebit Missmatch: AS-External-LSA */
+  if (ntohs (new->header->type) == OSPF6_LSTYPE_AS_EXTERNAL &&
+      ospf6_area_is_stub (from->ospf6_if->area))
+    {
+      if (IS_OSPF6_DEBUG_LSA (RECV))
+        zlog_info ("AS-External-LSA in stub area");
+      ospf6_lsa_delete (new);
+      return;
+    }
+
+  /* (4) if MaxAge LSA and if we have no instance, and no neighbor
+         is in states Exchange or Loading */
+  if (ospf6_is_maxage_lsa_drop (new, from))
+    {
+      /* log */
+      if (IS_OSPF6_DEBUG_LSA (RECV))
+        zlog_info ("Drop MaxAge LSA with Direct acknowledgement.");
+
+      /* a) Acknowledge back to neighbor (Direct acknowledgement, 13.5) */
+      if (IS_OSPF6_DEBUG_LSA (DATABASE))
+        zlog_info ("  Add %s to lsack_list of %s",
+                   new->name, from->name);
+      ospf6_lsdb_add (new, from->lsack_list);
+      if (from->thread_send_lsack == NULL)
+        from->thread_send_lsack =
+          thread_add_event (master, ospf6_lsack_send_neighbor, from, 0);
+
+      /* b) Discard */
+      /* "new" LSA will be discarded just after the LSAck sent */
+      return;
+    }
+
+  /* (5) */
+  /* lookup the same database copy in lsdb */
+  lsdb = ospf6_get_scoped_lsdb (new->header->type, new->scope);
+  if (lsdb == NULL)
+    {
+      zlog_warn ("Can't decide scoped LSDB, ignore");
+      ospf6_lsa_delete (new);
+      return;
+    }
+
+  old = ospf6_lsdb_lookup (new->header->type, new->header->id,
+                           new->header->adv_router, lsdb);
+  if (old)
+    {
+      ismore_recent = ospf6_lsa_compare (new, old);
+      if (ntohl (new->header->seqnum) == ntohl (old->header->seqnum))
+        {
+          if (IS_OSPF6_DEBUG_LSA (RECV))
+            zlog_info ("Duplicated LSA");
+          SET_FLAG (new->flag, OSPF6_LSA_DUPLICATE);
+        }
+    }
+
+  /* if no database copy or received is more recent */
+  if (old == NULL || ismore_recent < 0)
+    {
+      /* in case we have no database copy */
+      ismore_recent = -1;
+
+      /* (a) MinLSArrival check */
+      if (old)
+        {
+          struct timeval now, res;
+          gettimeofday (&now, (struct timezone *) NULL);
+          timersub (&now, &old->installed, &res);
+          if (res.tv_sec < MIN_LS_ARRIVAL)
+            {
+              if (IS_OSPF6_DEBUG_LSA (RECV) || IS_OSPF6_DEBUG_LSA (TIMER))
+                zlog_info ("LSA can't be updated within MinLSArrival");
+              ospf6_lsa_delete (new);
+              return;   /* examin next lsa */
+            }
+        }
+
+      /* (b) immediately flood and (c) remove from all retrans-list */
+      ospf6_flood_lsa (new, from);
+
+      /* (d), installing lsdb, which may cause routing
+              table calculation (replacing database copy) */
+      ospf6_install_lsa (new, lsdb);
+
+      /* (e) possibly acknowledge */
+      ospf6_acknowledge_lsa (new, ismore_recent, from);
+
+      /* (f) */
+      /* Self Originated LSA, section 13.4 */
+      if (new->header->adv_router == from->ospf6_if->area->ospf6->router_id
+          && (! old || ismore_recent < 0))
+        {
+          /* We have to make a new instance of the LSA
+             or have to flush this LSA. */
+          if (IS_OSPF6_DEBUG_LSA (RECV))
+            zlog_info ("New instance of the self-originated LSA");
+
+          SET_FLAG (new->flag, OSPF6_LSA_REFRESH);
+          ospf6_lsa_re_originate (new);
+        }
+      return;
+    }
+
+  /* (6) if there is instance on sending neighbor's request list */
+  if (ospf6_lsdb_lookup (new->header->type, new->header->id,
+                         new->header->adv_router, from->request_list))
+    {
+      /* if no database copy, should go above state (5) */
+      assert (old);
+
+      if (IS_OSPF6_DEBUG_LSA (RECV))
+        zlog_info ("LSA is not newer and on request-list of sending neighbor");
+
+      /* BadLSReq */
+      thread_add_event (master, bad_lsreq, from, 0);
+
+      ospf6_lsa_delete (new);
+      return;
+    }
+
+  /* (7) if neither one is more recent */
+  if (ismore_recent == 0)
+    {
+      if (IS_OSPF6_DEBUG_LSA (RECV))
+        zlog_info ("The same instance as database copy");
+
+      /* (a) if on retrans-list, Treat this LSA as an Ack: Implied Ack */
+      rem = ospf6_lsdb_lookup (new->header->type, new->header->id,
+                               new->header->adv_router, from->retrans_list);
+      if (rem)
+        {
+          if (IS_OSPF6_DEBUG_LSA (RECV))
+            zlog_info ("Treat as an Implied acknowledgement");
+          SET_FLAG (new->flag, OSPF6_LSA_IMPLIEDACK);
+          if (IS_OSPF6_DEBUG_LSA (DATABASE))
+            zlog_info ("Remove %s from retrans_list of %s",
+                       rem->name, from->name);
+          ospf6_lsdb_remove (rem, from->retrans_list);
+        }
+
+      /* (b) possibly acknowledge */
+      ospf6_acknowledge_lsa (new, ismore_recent, from);
+
+      ospf6_lsa_delete (new);
+      return;
+    }
+
+  /* (8) previous database copy is more recent */
+    {
+      assert (old);
+
+      /* If database copy is in 'Seqnumber Wrapping',
+         simply discard the received LSA */
+      if (OSPF6_LSA_IS_MAXAGE (old) &&
+          old->header->seqnum == htonl (MAX_SEQUENCE_NUMBER))
+        {
+          if (IS_OSPF6_DEBUG_LSA (RECV))
+            zlog_info ("Database copy is in Seqnumber Wrapping");
+          ospf6_lsa_delete (new);
+          return;
+        }
+
+      /* Otherwise, Send database copy of this LSA to this neighbor */
+        {
+          if (IS_OSPF6_DEBUG_LSA (RECV))
+            zlog_info ("Database is more recent, send back directly");
+
+          /* XXX, MinLSArrival check !? RFC 2328 13 (8) */
+
+          if (IS_OSPF6_DEBUG_LSA (DATABASE))
+            zlog_info ("  Add copy of %s to lsupdate_list of %s",
+                       old->name, from->name);
+          ospf6_lsdb_add (ospf6_lsa_copy (old), from->lsupdate_list);
+          if (from->thread_send_lsupdate == NULL)
+            from->thread_send_lsupdate =
+              thread_add_event (master, ospf6_lsupdate_send_neighbor, from, 0);
+          ospf6_lsa_delete (new);
+          return;
+        }
+      return;
+    }
+}
+
+
+