/*
 * 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 "memory.h"
#include "prefix.h"
#include "table.h"
#include "vty.h"
#include "command.h"

#include "ospf6d.h"
#include "ospf6_proto.h"
#include "ospf6_lsa.h"
#include "ospf6_route.h"

unsigned char conf_debug_ospf6_route = 0;

void
ospf6_linkstate_prefix (u_int32_t adv_router, u_int32_t id,
                        struct prefix *prefix)
{
  memset (prefix, 0, sizeof (struct prefix));
  prefix->family = AF_INET6;
  prefix->prefixlen = 64;
  memcpy (&prefix->u.prefix6.s6_addr[0], &adv_router, 4);
  memcpy (&prefix->u.prefix6.s6_addr[4], &id, 4);
}

void
ospf6_linkstate_prefix2str (struct prefix *prefix, char *buf, int size)
{
  u_int32_t adv_router, id;
  char adv_router_str[16];
  memcpy (&adv_router, &prefix->u.prefix6.s6_addr[0], 4);
  memcpy (&id, &prefix->u.prefix6.s6_addr[4], 4);
  inet_ntop (AF_INET, &adv_router, adv_router_str, sizeof (adv_router_str));
  snprintf (buf, size, "%s(%lu)", adv_router_str, (u_long) ntohl (id));
}

/* Global strings for logging */
char *ospf6_dest_type_str[OSPF6_DEST_TYPE_MAX] =
{ "Unknown", "Router", "Network", "Discard", "Linkstate", };

char *ospf6_dest_type_substr[OSPF6_DEST_TYPE_MAX] =
{ "?", "R", "N", "D", "L", };

char *ospf6_path_type_str[OSPF6_PATH_TYPE_MAX] =
{ "Unknown", "Intra-Area", "Inter-Area", "External-1", "External-2", };

char *ospf6_path_type_substr[OSPF6_PATH_TYPE_MAX] =
{ "??", "Ia", "Ie", "E1", "E2", };


struct ospf6_route *
ospf6_route_create ()
{
  struct ospf6_route *route;
  route = XCALLOC (MTYPE_OSPF6_ROUTE, sizeof (struct ospf6_route));
  return route;
}

void
ospf6_route_delete (struct ospf6_route *route)
{
  XFREE (MTYPE_OSPF6_ROUTE, route);
}

struct ospf6_route *
ospf6_route_copy (struct ospf6_route *route)
{
  struct ospf6_route *new;

  new = ospf6_route_create ();
  memcpy (new, route, sizeof (struct ospf6_route));
  new->rnode = NULL;
  new->prev = NULL;
  new->next = NULL;
  new->lock = 0;
  return new;
}

void
ospf6_route_lock (struct ospf6_route *route)
{
  route->lock++;
}

void
ospf6_route_unlock (struct ospf6_route *route)
{
  assert (route->lock > 0);
  route->lock--;
  if (route->lock == 0)
    ospf6_route_delete (route);
}

/* Route compare function. If ra is more preferred, it returns
   less than 0. If rb is more preferred returns greater than 0.
   Otherwise (neither one is preferred), returns 0 */
static int
ospf6_route_cmp (struct ospf6_route *ra, struct ospf6_route *rb)
{
  assert (ospf6_route_is_same (ra, rb));
  assert (OSPF6_PATH_TYPE_NONE < ra->path.type &&
          ra->path.type < OSPF6_PATH_TYPE_MAX);
  assert (OSPF6_PATH_TYPE_NONE < rb->path.type &&
          rb->path.type < OSPF6_PATH_TYPE_MAX);

  if (ra->type != rb->type)
    return (ra->type - rb->type);

  if (ra->path.area_id != rb->path.area_id)
    return (ntohl (ra->path.area_id) - ntohl (rb->path.area_id));

  if (ra->path.type != rb->path.type)
    return (ra->path.type - rb->path.type);

  if (ra->path.type == OSPF6_PATH_TYPE_EXTERNAL2)
    {
      if (ra->path.cost_e2 != rb->path.cost_e2)
        return (ra->path.cost_e2 - rb->path.cost_e2);
    }
  else
    {
      if (ra->path.cost != rb->path.cost)
        return (ra->path.cost - rb->path.cost);
    }

  return 0;
}

struct ospf6_route *
ospf6_route_lookup (struct prefix *prefix,
                    struct ospf6_route_table *table)
{
  struct route_node *node;
  struct ospf6_route *route;

  node = route_node_lookup (table->table, prefix);
  if (node == NULL)
    return NULL;

  route = (struct ospf6_route *) node->info;
  return route;
}

struct ospf6_route *
ospf6_route_lookup_identical (struct ospf6_route *route,
                              struct ospf6_route_table *table)
{
  struct ospf6_route *target;

  for (target = ospf6_route_lookup (&route->prefix, table);
       target; target = target->next)
    {
      if (ospf6_route_is_identical (target, route))
        return target;
    }
  return NULL;
}

struct ospf6_route *
ospf6_route_lookup_bestmatch (struct prefix *prefix,
                              struct ospf6_route_table *table)
{
  struct route_node *node;
  struct ospf6_route *route;

  node = route_node_match (table->table, prefix);
  if (node == NULL)
    return NULL;
  route_unlock_node (node);

  route = (struct ospf6_route *) node->info;
  return route;
}

#ifndef NDEBUG
static void
_route_count_assert (struct ospf6_route_table *table)
{
  struct ospf6_route *debug;
  int num = 0;
  for (debug = ospf6_route_head (table); debug;
       debug = ospf6_route_next (debug))
    num++;
  assert (num == table->count);
}
#define ospf6_route_count_assert(t) (_route_count_assert (t))
#else
#define ospf6_route_count_assert(t) ((void) 0)
#endif /*NDEBUG*/

struct ospf6_route *
ospf6_route_add (struct ospf6_route *route,
                 struct ospf6_route_table *table)
{
  struct route_node *node, *nextnode, *prevnode;
  struct ospf6_route *current = NULL;
  struct ospf6_route *prev = NULL, *old = NULL, *next = NULL;
  char buf[64];
  struct timeval now;

  assert (route->rnode == NULL);
  assert (route->lock == 0);
  assert (route->next == NULL);
  assert (route->prev == NULL);

  if (route->type == OSPF6_DEST_TYPE_LINKSTATE)
    ospf6_linkstate_prefix2str (&route->prefix, buf, sizeof (buf));
  else
    prefix2str (&route->prefix, buf, sizeof (buf));

  if (IS_OSPF6_DEBUG_ROUTE (TABLE))
    zlog_info ("route add %s", buf);

  gettimeofday (&now, NULL);

  node = route_node_get (table->table, &route->prefix);
  route->rnode = node;

  /* find place to insert */
  for (current = node->info; current; current = current->next)
    {
      if (! ospf6_route_is_same (current, route))
        next = current;
      else if (current->type != route->type)
        prev = current;
      else if (ospf6_route_is_same_origin (current, route))
        old = current;
      else if (ospf6_route_cmp (current, route) > 0)
        next = current;
      else
        prev = current;

      if (old || next)
        break;
    }

  if (old)
    {
      /* if route does not actually change, return unchanged */
      if (ospf6_route_is_identical (old, route))
        {
          if (IS_OSPF6_DEBUG_ROUTE (TABLE))
            zlog_info ("  identical route found, ignore");

          ospf6_route_delete (route);
          SET_FLAG (old->flag, OSPF6_ROUTE_ADD);
          ospf6_route_count_assert (table);
          return old;
        }

      if (IS_OSPF6_DEBUG_ROUTE (TABLE))
        zlog_info ("  old route found, replace");

      /* replace old one if exists */
      if (node->info == old)
        {
          node->info = route;
          SET_FLAG (route->flag, OSPF6_ROUTE_BEST);
        }

      if (old->prev)
        old->prev->next = route;
      route->prev = old->prev;
      if (old->next)
        old->next->prev = route;
      route->next = old->next;

      route->installed = old->installed;
      route->changed = now;

      ospf6_route_unlock (old); /* will be deleted later */
      ospf6_route_lock (route);

      SET_FLAG (route->flag, OSPF6_ROUTE_CHANGE);
      if (table->hook_add)
        (*table->hook_add) (route);

      ospf6_route_count_assert (table);
      return route;
    }

  /* insert if previous or next node found */
  if (prev || next)
    {
      if (IS_OSPF6_DEBUG_ROUTE (TABLE))
        zlog_info ("  another path found, insert");

      if (prev == NULL)
        prev = next->prev;
      if (next == NULL)
        next = prev->next;

      if (prev)
        prev->next = route;
      route->prev = prev;
      if (next)
        next->prev = route;
      route->next = next;

      if (node->info == next)
        {
          assert (next->rnode == node);
          node->info = route;
          UNSET_FLAG (next->flag, OSPF6_ROUTE_BEST);
          SET_FLAG (route->flag, OSPF6_ROUTE_BEST);
        }

      route->installed = now;
      route->changed = now;

      ospf6_route_lock (route);
      table->count++;

      SET_FLAG (route->flag, OSPF6_ROUTE_ADD);
      if (table->hook_add)
        (*table->hook_add) (route);

      ospf6_route_count_assert (table);
      return route;
    }

  /* Else, this is the brand new route regarding to the prefix */
  if (IS_OSPF6_DEBUG_ROUTE (TABLE))
    zlog_info ("  brand new route, add");

  assert (node->info == NULL);
  node->info = route;
  SET_FLAG (route->flag, OSPF6_ROUTE_BEST);
  ospf6_route_lock (route);
  route->installed = now;
  route->changed = now;

  /* lookup real existing next route */
  nextnode = node;
  route_lock_node (nextnode);
  do {
    nextnode = route_next (nextnode);
  } while (nextnode && nextnode->info == NULL);

  /* set next link */
  if (nextnode == NULL)
    route->next = NULL;
  else
    {
      route_unlock_node (nextnode);

      next = nextnode->info;
      route->next = next;
      next->prev = route;
    }

  /* lookup real existing prev route */
  prevnode = node;
  route_lock_node (prevnode);
  do {
    prevnode = route_prev (prevnode);
  } while (prevnode && prevnode->info == NULL);

  /* set prev link */
  if (prevnode == NULL)
    route->prev = NULL;
  else
    {
      route_unlock_node (prevnode);

      prev = prevnode->info;
      while (prev->next && ospf6_route_is_same (prev, prev->next))
        prev = prev->next;
      route->prev = prev;
      prev->next = route;
    }

  table->count++;

  SET_FLAG (route->flag, OSPF6_ROUTE_ADD);
  if (table->hook_add)
    (*table->hook_add) (route);

  ospf6_route_count_assert (table);
  return route;
}

void
ospf6_route_remove (struct ospf6_route *route,
                    struct ospf6_route_table *table)
{
  struct route_node *node;
  struct ospf6_route *current;
  char buf[64];

  if (route->type == OSPF6_DEST_TYPE_LINKSTATE)
    ospf6_linkstate_prefix2str (&route->prefix, buf, sizeof (buf));
  else
    prefix2str (&route->prefix, buf, sizeof (buf));

  if (IS_OSPF6_DEBUG_ROUTE (TABLE))
    zlog_info ("route remove: %s", buf);

  node = route_node_lookup (table->table, &route->prefix);
  assert (node);

  /* find the route to remove, making sure that the route pointer
     is from the route table. */
  current = node->info;
  while (current && ospf6_route_is_same (current, route))
    {
      if (current == route)
        break;
      current = current->next;
    }
  assert (current == route);

  /* adjust doubly linked list */
  if (route->prev)
    route->prev->next = route->next;
  if (route->next)
    route->next->prev = route->prev;

  if (node->info == route)
    {
      if (route->next && ospf6_route_is_same (route->next, route))
        {
          node->info = route->next;
          SET_FLAG (route->next->flag, OSPF6_ROUTE_BEST);
        }
      else
        node->info = NULL; /* should unlock route_node here ? */
    }

  if (table->hook_remove)
    (*table->hook_remove) (route);

  ospf6_route_unlock (route);
  table->count--;

  ospf6_route_count_assert (table);
}

struct ospf6_route *
ospf6_route_head (struct ospf6_route_table *table)
{
  struct route_node *node;
  struct ospf6_route *route;

  node = route_top (table->table);
  if (node == NULL)
    return NULL;

  /* skip to the real existing entry */
  while (node && node->info == NULL)
    node = route_next (node);
  if (node == NULL)
    return NULL;

  route_unlock_node (node);
  assert (node->info);

  route = (struct ospf6_route *) node->info;
  assert (route->prev == NULL);
  ospf6_route_lock (route);
  return route;
}

struct ospf6_route *
ospf6_route_next (struct ospf6_route *route)
{
  struct ospf6_route *next = route->next;

  ospf6_route_unlock (route);
  if (next)
    ospf6_route_lock (next);

  return next;
}

struct ospf6_route *
ospf6_route_best_next (struct ospf6_route *route)
{
  struct route_node *rnode;
  struct ospf6_route *next;

  rnode = route->rnode;
  route_lock_node (rnode);
  rnode = route_next (rnode);
  while (rnode && rnode->info == NULL)
    rnode = route_next (rnode);
  if (rnode == NULL)
    return NULL;
  route_unlock_node (rnode);

  assert (rnode->info);
  next = (struct ospf6_route *) rnode->info;
  ospf6_route_unlock (route);
  ospf6_route_lock (next);
  return next;
}

/* Macro version of check_bit (). */
#define CHECK_BIT(X,P) ((((u_char *)(X))[(P) / 8]) >> (7 - ((P) % 8)) & 1)

struct ospf6_route *
ospf6_route_match_head (struct prefix *prefix,
                        struct ospf6_route_table *table)
{
  struct route_node *node;
  struct ospf6_route *route;

  /* Walk down tree. */
  node = table->table->top;
  while (node && node->p.prefixlen < prefix->prefixlen &&
	 prefix_match (&node->p, prefix))
    node = node->link[CHECK_BIT(&prefix->u.prefix, node->p.prefixlen)];

  if (node)
    route_lock_node (node);
  while (node && node->info == NULL)
    node = route_next (node);
  if (node == NULL)
    return NULL;
  route_unlock_node (node);

  if (! prefix_match (prefix, &node->p))
    return NULL;

  route = node->info;
  ospf6_route_lock (route);
  return route;
}

struct ospf6_route *
ospf6_route_match_next (struct prefix *prefix,
                        struct ospf6_route *route)
{
  struct ospf6_route *next;

  next = ospf6_route_next (route);
  if (next && ! prefix_match (prefix, &next->prefix))
    {
      ospf6_route_unlock (next);
      next = NULL;
    }

  return next;
}

void
ospf6_route_remove_all (struct ospf6_route_table *table)
{
  struct ospf6_route *route;
  for (route = ospf6_route_head (table); route;
       route = ospf6_route_next (route))
    ospf6_route_remove (route, table);
}

struct ospf6_route_table *
ospf6_route_table_create ()
{
  struct ospf6_route_table *new;
  new = XCALLOC (MTYPE_OSPF6_ROUTE, sizeof (struct ospf6_route_table));
  new->table = route_table_init ();
  return new;
}

void
ospf6_route_table_delete (struct ospf6_route_table *table)
{
  ospf6_route_remove_all (table);
  route_table_finish (table->table);
  XFREE (MTYPE_OSPF6_ROUTE, table);
}


/* VTY commands */
void
ospf6_route_show (struct vty *vty, struct ospf6_route *route)
{
  int i;
  char destination[64], nexthop[64];
  char duration[16], ifname[IFNAMSIZ];
  struct timeval now, res;

  gettimeofday (&now, (struct timezone *) NULL);
  timersub (&now, &route->changed, &res);
  timerstring (&res, duration, sizeof (duration));

  /* destination */
  if (route->type == OSPF6_DEST_TYPE_LINKSTATE)
    ospf6_linkstate_prefix2str (&route->prefix, destination,
                                sizeof (destination));
  else if (route->type == OSPF6_DEST_TYPE_ROUTER)
    inet_ntop (route->prefix.family, &route->prefix.u.prefix,
               destination, sizeof (destination));
  else
    prefix2str (&route->prefix, destination, sizeof (destination));

  /* nexthop */
  inet_ntop (AF_INET6, &route->nexthop[0].address, nexthop,
             sizeof (nexthop));
  if (! if_indextoname (route->nexthop[0].ifindex, ifname))
    snprintf (ifname, sizeof (ifname), "%d", route->nexthop[0].ifindex);

  vty_out (vty, "%c%1s %2s %-30s %-25s %6s %s%s",
           (ospf6_route_is_best (route) ? '*' : ' '),
           OSPF6_DEST_TYPE_SUBSTR (route->type),
           OSPF6_PATH_TYPE_SUBSTR (route->path.type),
           destination, nexthop, ifname, duration, VTY_NEWLINE);

  for (i = 1; ospf6_nexthop_is_set (&route->nexthop[i]) &&
       i < OSPF6_MULTI_PATH_LIMIT; i++)
    {
      /* nexthop */
      inet_ntop (AF_INET6, &route->nexthop[i].address, nexthop,
                 sizeof (nexthop));
      if (! if_indextoname (route->nexthop[i].ifindex, ifname))
        snprintf (ifname, sizeof (ifname), "%d", route->nexthop[i].ifindex);

      vty_out (vty, "%c%1s %2s %-30s %-25s %6s %s%s",
               ' ', "", "", "", nexthop, ifname, "", VTY_NEWLINE);
    }
}

void
ospf6_route_show_detail (struct vty *vty, struct ospf6_route *route)
{
  char destination[64], nexthop[64], ifname[IFNAMSIZ];
  char area_id[16], id[16], adv_router[16], capa[16], options[16];
  struct timeval now, res;
  char duration[16];
  int i;

  gettimeofday (&now, (struct timezone *) NULL);

  /* destination */
  if (route->type == OSPF6_DEST_TYPE_LINKSTATE)
    ospf6_linkstate_prefix2str (&route->prefix, destination,
                                sizeof (destination));
  else if (route->type == OSPF6_DEST_TYPE_ROUTER)
    inet_ntop (route->prefix.family, &route->prefix.u.prefix,
               destination, sizeof (destination));
  else
    prefix2str (&route->prefix, destination, sizeof (destination));
  vty_out (vty, "Destination: %s%s", destination, VTY_NEWLINE);

  /* destination type */
  vty_out (vty, "Destination type: %s%s",
           OSPF6_DEST_TYPE_NAME (route->type),
           VTY_NEWLINE);

  /* Time */
  timersub (&now, &route->installed, &res);
  timerstring (&res, duration, sizeof (duration));
  vty_out (vty, "Installed Time: %s ago%s", duration, VTY_NEWLINE);

  timersub (&now, &route->changed, &res);
  timerstring (&res, duration, sizeof (duration));
  vty_out (vty, "  Changed Time: %s ago%s", duration, VTY_NEWLINE);

  /* Debugging info */
  vty_out (vty, "Lock: %d Flags: %s%s%s%s%s", route->lock,
           (CHECK_FLAG (route->flag, OSPF6_ROUTE_BEST)   ? "B" : "-"),
           (CHECK_FLAG (route->flag, OSPF6_ROUTE_ADD)    ? "A" : "-"),
           (CHECK_FLAG (route->flag, OSPF6_ROUTE_REMOVE) ? "R" : "-"),
           (CHECK_FLAG (route->flag, OSPF6_ROUTE_CHANGE) ? "C" : "-"),
           VTY_NEWLINE);
  vty_out (vty, "Memory: prev: %p this: %p next: %p%s",
           route->prev, route, route->next, VTY_NEWLINE);

  /* Path section */

  /* Area-ID */
  inet_ntop (AF_INET, &route->path.area_id, area_id, sizeof (area_id));
  vty_out (vty, "Associated Area: %s%s", area_id, VTY_NEWLINE);

  /* Path type */
  vty_out (vty, "Path Type: %s%s",
           OSPF6_PATH_TYPE_NAME (route->path.type), VTY_NEWLINE);

  /* LS Origin */
  inet_ntop (AF_INET, &route->path.origin.id, id, sizeof (id));
  inet_ntop (AF_INET, &route->path.origin.adv_router, adv_router,
             sizeof (adv_router));
  vty_out (vty, "LS Origin: %s Id: %s Adv: %s%s",
           OSPF6_LSTYPE_NAME (route->path.origin.type),
           id, adv_router, VTY_NEWLINE);

  /* Options */
  ospf6_options_printbuf (route->path.options, options, sizeof (options));
  vty_out (vty, "Options: %s%s", options, VTY_NEWLINE);

  /* Router Bits */
  ospf6_capability_printbuf (route->path.router_bits, capa, sizeof (capa));
  vty_out (vty, "Router Bits: %s%s", capa, VTY_NEWLINE);

  /* Prefix Options */
  vty_out (vty, "Prefix Options: xxx%s", VTY_NEWLINE);

  /* Metrics */
  vty_out (vty, "Metric Type: %d%s", route->path.metric_type,
           VTY_NEWLINE);
  vty_out (vty, "Metric: %d (%d)%s",
           route->path.cost, route->path.cost_e2, VTY_NEWLINE);

  /* Nexthops */
  vty_out (vty, "Nexthop:%s", VTY_NEWLINE);
  for (i = 0; ospf6_nexthop_is_set (&route->nexthop[i]) &&
       i < OSPF6_MULTI_PATH_LIMIT; i++)
    {
      /* nexthop */
      inet_ntop (AF_INET6, &route->nexthop[i].address, nexthop,
                 sizeof (nexthop));
      if (! if_indextoname (route->nexthop[i].ifindex, ifname))
        snprintf (ifname, sizeof (ifname), "%d", route->nexthop[i].ifindex);
      vty_out (vty, "  %s %s%s", nexthop, ifname, VTY_NEWLINE);
    }
  vty_out (vty, "%s", VTY_NEWLINE);
}

void
ospf6_route_show_table_summary (struct vty *vty,
                                struct ospf6_route_table *table)
{
  struct ospf6_route *route, *prev = NULL;
  int i, pathtype[OSPF6_PATH_TYPE_MAX];
  int number = 0;
  int nhinval = 0, ecmp = 0;
  int multipath = 0, destination = 0;
  int desttype = 0, desttype_mismatch = 0;

  for (i = 0; i < OSPF6_PATH_TYPE_MAX; i++)
    pathtype[i] = 0;

  for (route = ospf6_route_head (table); route;
       route = ospf6_route_next (route))
    {
      if (desttype == 0)
        desttype = route->type;
      else if (desttype != route->type)
        desttype_mismatch++;

      if (prev == NULL || ! ospf6_route_is_same (prev, route))
        destination++;
      else
        multipath++;

      if (! ospf6_nexthop_is_set (&route->nexthop[0]))
        nhinval++;
      else if (ospf6_nexthop_is_set (&route->nexthop[1]))
        ecmp++;

      if (prev == NULL || ! ospf6_route_is_same (prev, route))
        pathtype[route->path.type]++;

      number++;
      prev = route;
    }

  assert (number == table->count);
  vty_out (vty, "Number of Destination: %d (%d routes)%s",
           destination, number, VTY_NEWLINE);
  if (multipath)
    vty_out (vty, "  Number of Multi-path: %d%s", multipath, VTY_NEWLINE);
  if (desttype_mismatch)
    vty_out (vty, "  Number of Different Dest-type: %d%s",
             desttype_mismatch, VTY_NEWLINE);
  if (ecmp)
    vty_out (vty, "  Number of Equal Cost Multi Path: %d%s",
             ecmp, VTY_NEWLINE);
  if (ecmp)
    vty_out (vty, "  Number of Invalid Nexthop: %d%s",
             nhinval, VTY_NEWLINE);

  for (i = 0; i < OSPF6_PATH_TYPE_MAX; i++)
    {
      if (pathtype[i])
        vty_out (vty, "  Number of %s routes: %d%s",
                 OSPF6_PATH_TYPE_NAME (i), pathtype[i], VTY_NEWLINE);
    }
}

int
ospf6_route_table_show (struct vty *vty, int argc, char **argv,
                        struct ospf6_route_table *table)
{
  unsigned char flag = 0;
#define MATCH      0x01
#define DETAIL     0x02
#define PREFIX     0x04
#define SUMMARY    0x08
  int i, ret;
  struct prefix prefix, *p;
  struct ospf6_route *route;

  memset (&prefix, 0, sizeof (struct prefix));

  for (i = 0; i < argc; i++)
    {
      /* set "detail" */
      if (! strcmp (argv[i], "summary"))
        {
          SET_FLAG (flag, SUMMARY);
          continue;
        }

      /* set "detail" */
      if (! strcmp (argv[i], "detail"))
        {
          SET_FLAG (flag, DETAIL);
          continue;
        }

      /* set "match" */
      if (! strcmp (argv[i], "match"))
        {
          SET_FLAG (flag, MATCH);
          continue;
        }

      if (prefix.family)
        {
          vty_out (vty, "Invalid argument: %s%s", argv[i], VTY_NEWLINE);
          return CMD_SUCCESS;
        }

      ret = str2prefix (argv[i], &prefix);
      if (ret != 1 || prefix.family != AF_INET6)
        {
          vty_out (vty, "Malformed argument: %s%s", argv[i], VTY_NEWLINE);
          return CMD_SUCCESS;
        }

      if (strchr (argv[i], '/'))
        SET_FLAG (flag, PREFIX);
    }

  /* Give summary of this route table */
  if (CHECK_FLAG (flag, SUMMARY))
    {
      ospf6_route_show_table_summary (vty, table);
      return CMD_SUCCESS;
    }

  /* Give exact prefix-match route */
  if (prefix.family && ! CHECK_FLAG (flag, MATCH))
    {
      /* If exact address, give best matching route */
      if (! CHECK_FLAG (flag, PREFIX))
        route = ospf6_route_lookup_bestmatch (&prefix, table);
      else
        route = ospf6_route_lookup (&prefix, table);

      if (route)
        {
          ospf6_route_lock (route);
          p = &route->prefix;
        }

      while (route && ospf6_route_is_prefix (p, route))
        {
          /* Seaching an entry will always display details */
          if (route)
            ospf6_route_show_detail (vty, route);

          route = ospf6_route_next (route);
        }

      return CMD_SUCCESS;
    }

  if (prefix.family == 0)
    route = ospf6_route_head (table);
  else
    route = ospf6_route_match_head (&prefix, table);

  while (route)
    {
      if (CHECK_FLAG (flag, DETAIL))
        ospf6_route_show_detail (vty, route);
      else
        ospf6_route_show (vty, route);

      if (prefix.family == 0)
        route = ospf6_route_next (route);
      else
        route = ospf6_route_match_next (&prefix, route);
    }

  return CMD_SUCCESS;
}


int
ospf6_lsentry_table_show (struct vty *vty, int argc, char **argv,
                          struct ospf6_route_table *table)
{
  unsigned char flag = 0;
#define MATCH      0x01
#define DETAIL     0x02
  int i, ret;
  struct prefix adv_router, id, prefix;
  struct ospf6_route *route;

  memset (&adv_router, 0, sizeof (struct prefix));
  memset (&id, 0, sizeof (struct prefix));

  for (i = 0; i < argc; i++)
    {
      /* set "detail" */
      if (! strcmp (argv[i], "detail"))
        {
          SET_FLAG (flag, DETAIL);
          continue;
        }

      /* set "match" */
      if (! strcmp (argv[i], "match"))
        {
          SET_FLAG (flag, MATCH);
          continue;
        }

      if (adv_router.family && id.family)
        {
          vty_out (vty, "Invalid argument: %s%s", argv[i], VTY_NEWLINE);
          return CMD_SUCCESS;
        }

      if (adv_router.family == 0)
        {
          ret = str2prefix (argv[i], &adv_router);
          if (ret != 1)
            {
              if (! strcmp (argv[i], "*"))
                {
                  adv_router.family = AF_INET;
                  adv_router.prefixlen = 0;
                  ret = 1;
                }
            }
          if (ret != 1)
            {
              vty_out (vty, "Invalid Router-ID: %s%s", argv[i], VTY_NEWLINE);
              return CMD_SUCCESS;
            }
        }
      else if (id.family == 0)
        {
          unsigned long val;
          char *endptr;

          ret = str2prefix (argv[i], &id);
          if (ret != 1)
            {
              val = strtoul (argv[i], &endptr, 0);
              if (val != ULONG_MAX && *endptr == '\0')
                {
                  id.u.prefix4.s_addr = val;
                  ret = 1;
                }
            }

          if (ret != 1)
            {
              vty_out (vty, "Invalid Link state ID: %s%s", argv[i],
                       VTY_NEWLINE);
              return CMD_WARNING;
            }
        }
    }

  /* Encode to linkstate prefix */
  if (adv_router.family)
    {
      if (adv_router.prefixlen == 0 &&
          id.family && id.prefixlen != IPV4_MAX_BITLEN)
        {
          vty_out (vty, "Specifying Link State ID by prefix is not allowed%s"
                   "when specifying Router-ID as wildcard%s",
                   VTY_NEWLINE, VTY_NEWLINE);
          return CMD_SUCCESS;
        }
      else if (adv_router.prefixlen != 0 &&
               adv_router.prefixlen != IPV4_MAX_BITLEN && id.family)
        {
          vty_out (vty, "Specifying Link State ID is not allowed%s"
                   "when specifying Router-ID by prefix%s",
                   VTY_NEWLINE, VTY_NEWLINE);
          return CMD_SUCCESS;
        }

      if (adv_router.prefixlen == 0)
        ospf6_linkstate_prefix (0, id.u.prefix4.s_addr, &prefix);
      else if (adv_router.prefixlen != IPV4_MAX_BITLEN)
        {
          ospf6_linkstate_prefix (adv_router.u.prefix4.s_addr, 0, &prefix);
          prefix.prefixlen = adv_router.prefixlen;
          SET_FLAG (flag, MATCH);
        }
      else
        {
          ospf6_linkstate_prefix (adv_router.u.prefix4.s_addr,
                                  id.u.prefix4.s_addr, &prefix);
          prefix.prefixlen = adv_router.prefixlen + id.prefixlen;
          if (prefix.prefixlen != 64)
            SET_FLAG (flag, MATCH);
        }
    }

  /* give exact match entry */
  if (adv_router.family && adv_router.prefixlen == IPV4_MAX_BITLEN &&
      id.family && id.prefixlen == IPV4_MAX_BITLEN)
    {
      route = ospf6_route_lookup (&prefix, table);
      if (route)
        ospf6_route_show_detail (vty, route);
      return CMD_SUCCESS;
    }

  if (CHECK_FLAG (flag, MATCH))
    route = ospf6_route_match_head (&prefix, table);
  else
    route = ospf6_route_head (table);

  while (route)
    {
      if (! adv_router.family ||
          (CHECK_FLAG (flag, MATCH) &&
           prefix_match (&prefix, &route->prefix)) ||
          (adv_router.prefixlen == 0 && id.family &&
           ospf6_linkstate_prefix_id (&prefix) ==
           ospf6_linkstate_prefix_id (&route->prefix)))
        {
          if (CHECK_FLAG (flag, DETAIL))
            ospf6_route_show_detail (vty, route);
          else
            ospf6_route_show (vty, route);
        }

      if (CHECK_FLAG (flag, MATCH))
        route = ospf6_route_match_next (&prefix, route);
      else
        route = ospf6_route_next (route);
    }

  return CMD_SUCCESS;
}

DEFUN (debug_ospf6_route,
       debug_ospf6_route_cmd,
       "debug ospf6 route (table|intra-area|inter-area)",
       DEBUG_STR
       OSPF6_STR
       "Debug route table calculation\n"
       "Debug detail\n"
       "Debug intra-area route calculation\n"
       "Debug inter-area route calculation\n"
       )
{
  unsigned char level = 0;

  if (! strncmp (argv[0], "table", 5))
    level = OSPF6_DEBUG_ROUTE_TABLE;
  else if (! strncmp (argv[0], "intra", 5))
    level = OSPF6_DEBUG_ROUTE_INTRA;
  else if (! strncmp (argv[0], "inter", 5))
    level = OSPF6_DEBUG_ROUTE_INTER;
  OSPF6_DEBUG_ROUTE_ON (level);
  return CMD_SUCCESS;
}

DEFUN (no_debug_ospf6_route,
       no_debug_ospf6_route_cmd,
       "no debug ospf6 route (table|intra-area|inter-area)",
       NO_STR
       DEBUG_STR
       OSPF6_STR
       "Debug route table calculation\n"
       "Debug intra-area route calculation\n")
{
  unsigned char level = 0;

  if (! strncmp (argv[0], "table", 5))
    level = OSPF6_DEBUG_ROUTE_TABLE;
  else if (! strncmp (argv[0], "intra", 5))
    level = OSPF6_DEBUG_ROUTE_INTRA;
  else if (! strncmp (argv[0], "inter", 5))
    level = OSPF6_DEBUG_ROUTE_INTER;
  OSPF6_DEBUG_ROUTE_OFF (level);
  return CMD_SUCCESS;
}

int
config_write_ospf6_debug_route (struct vty *vty)
{
  if (IS_OSPF6_DEBUG_ROUTE (TABLE))
    vty_out (vty, "debug ospf6 route table%s", VTY_NEWLINE);
  if (IS_OSPF6_DEBUG_ROUTE (INTRA))
    vty_out (vty, "debug ospf6 route intra-area%s", VTY_NEWLINE);
  if (IS_OSPF6_DEBUG_ROUTE (INTER))
    vty_out (vty, "debug ospf6 route inter-area%s", VTY_NEWLINE);
  return 0;
}

void
install_element_ospf6_debug_route ()
{
  install_element (ENABLE_NODE, &debug_ospf6_route_cmd);
  install_element (ENABLE_NODE, &no_debug_ospf6_route_cmd);
  install_element (CONFIG_NODE, &debug_ospf6_route_cmd);
  install_element (CONFIG_NODE, &no_debug_ospf6_route_cmd);
}