ospf6_area.c

linux 路由软件 可支持RIP OSPF BGP等

/*
 * 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 "linklist.h"
#include "thread.h"
#include "vty.h"
#include "command.h"
#include "if.h"
#include "prefix.h"
#include "table.h"

#include "ospf6_proto.h"
#include "ospf6_lsa.h"
#include "ospf6_lsdb.h"
#include "ospf6_route.h"
#include "ospf6_spf.h"
#include "ospf6_top.h"
#include "ospf6_area.h"
#include "ospf6_interface.h"
#include "ospf6_intra.h"
#include "ospf6_abr.h"
#include "ospf6d.h"

int
ospf6_area_cmp (void *va, void *vb)
{
  struct ospf6_area *oa = (struct ospf6_area *) va;
  struct ospf6_area *ob = (struct ospf6_area *) vb;
  return (ntohl (oa->area_id) < ntohl (ob->area_id) ? -1 : 1);
}

/* schedule routing table recalculation */
void
ospf6_area_lsdb_hook_add (struct ospf6_lsa *lsa)
{
  switch (ntohs (lsa->header->type))
    {
    case OSPF6_LSTYPE_ROUTER:
    case OSPF6_LSTYPE_NETWORK:
      if (IS_OSPF6_DEBUG_EXAMIN_TYPE (lsa->header->type))
        {
          zlog_info ("Examin %s", lsa->name);
          zlog_info ("Schedule SPF Calculation for %s",
                     OSPF6_AREA (lsa->lsdb->data)->name);
        }
      ospf6_spf_schedule (OSPF6_AREA (lsa->lsdb->data));
      break;

    case OSPF6_LSTYPE_INTRA_PREFIX:
      ospf6_intra_prefix_lsa_add (lsa);
      break;

    case OSPF6_LSTYPE_INTER_PREFIX:
    case OSPF6_LSTYPE_INTER_ROUTER:
      ospf6_abr_examin_summary (lsa, (struct ospf6_area *) lsa->lsdb->data);
      break;

    default:
      break;
    }
}

void
ospf6_area_lsdb_hook_remove (struct ospf6_lsa *lsa)
{
  switch (ntohs (lsa->header->type))
    {
    case OSPF6_LSTYPE_ROUTER:
    case OSPF6_LSTYPE_NETWORK:
      if (IS_OSPF6_DEBUG_EXAMIN_TYPE (lsa->header->type))
        {
          zlog_info ("LSA disappearing: %s", lsa->name);
          zlog_info ("Schedule SPF Calculation for %s",
                     OSPF6_AREA (lsa->lsdb->data)->name);
        }
      ospf6_spf_schedule (OSPF6_AREA (lsa->lsdb->data));
      break;

    case OSPF6_LSTYPE_INTRA_PREFIX:
      ospf6_intra_prefix_lsa_remove (lsa);
      break;

    case OSPF6_LSTYPE_INTER_PREFIX:
    case OSPF6_LSTYPE_INTER_ROUTER:
      ospf6_abr_examin_summary (lsa, (struct ospf6_area *) lsa->lsdb->data);
      break;

    default:
      break;
    }
}

void
ospf6_area_route_hook_add (struct ospf6_route *route)
{
  struct ospf6_route *copy = ospf6_route_copy (route);
  ospf6_route_add (copy, ospf6->route_table);
}

void
ospf6_area_route_hook_remove (struct ospf6_route *route)
{
  struct ospf6_route *copy;

  copy = ospf6_route_lookup_identical (route, ospf6->route_table);
  if (copy)
    ospf6_route_remove (copy, ospf6->route_table);
}

/* Make new area structure */
struct ospf6_area *
ospf6_area_create (u_int32_t area_id, struct ospf6 *o)
{
  struct ospf6_area *oa;
  struct ospf6_route *route;

  oa = XCALLOC (MTYPE_OSPF6_AREA, sizeof (struct ospf6_area));

  inet_ntop (AF_INET, &area_id, oa->name, sizeof (oa->name));
  oa->area_id = area_id;
  oa->if_list = list_new ();

  oa->lsdb = ospf6_lsdb_create (oa);
  oa->lsdb->hook_add = ospf6_area_lsdb_hook_add;
  oa->lsdb->hook_remove = ospf6_area_lsdb_hook_remove;
  oa->lsdb_self = ospf6_lsdb_create (oa);

  oa->spf_table = ospf6_route_table_create ();
  oa->route_table = ospf6_route_table_create ();
  oa->route_table->hook_add = ospf6_area_route_hook_add;
  oa->route_table->hook_remove = ospf6_area_route_hook_remove;

  oa->range_table = ospf6_route_table_create ();
  oa->summary_prefix = ospf6_route_table_create ();
  oa->summary_router = ospf6_route_table_create ();

  /* set default options */
  OSPF6_OPT_SET (oa->options, OSPF6_OPT_V6);
  OSPF6_OPT_SET (oa->options, OSPF6_OPT_E);
  OSPF6_OPT_SET (oa->options, OSPF6_OPT_R);

  oa->ospf6 = o;
  listnode_add_sort (o->area_list, oa);

  /* import athoer area's routes as inter-area routes */
  for (route = ospf6_route_head (o->route_table); route;
       route = ospf6_route_next (route))
    ospf6_abr_originate_summary_to_area (route, oa);

  return oa;
}

void
ospf6_area_delete (struct ospf6_area *oa)
{
  listnode n;
  struct ospf6_interface *oi;

  ospf6_route_table_delete (oa->range_table);
  ospf6_route_table_delete (oa->summary_prefix);
  ospf6_route_table_delete (oa->summary_router);

  /* ospf6 interface list */
  for (n = listhead (oa->if_list); n; nextnode (n))
    {
      oi = (struct ospf6_interface *) getdata (n);
      ospf6_interface_delete (oi);
    }
  list_delete (oa->if_list);

  ospf6_lsdb_delete (oa->lsdb);
  ospf6_lsdb_delete (oa->lsdb_self);

  ospf6_route_table_delete (oa->spf_table);
  ospf6_route_table_delete (oa->route_table);

#if 0
  ospf6_spftree_delete (oa->spf_tree);
  ospf6_route_table_delete (oa->topology_table);
#endif /*0*/

  THREAD_OFF (oa->thread_spf_calculation);
  THREAD_OFF (oa->thread_route_calculation);

  listnode_delete (oa->ospf6->area_list, oa);
  oa->ospf6 = NULL;

  /* free area */
  XFREE (MTYPE_OSPF6_AREA, oa);
}

struct ospf6_area *
ospf6_area_lookup (u_int32_t area_id, struct ospf6 *ospf6)
{
  struct ospf6_area *oa;
  listnode n;

  for (n = listhead (ospf6->area_list); n; nextnode (n))
    {
      oa = (struct ospf6_area *) getdata (n);
      if (oa->area_id == area_id)
        return oa;
    }

  return (struct ospf6_area *) NULL;
}

struct ospf6_area *
ospf6_area_get (u_int32_t area_id, struct ospf6 *o)
{
  struct ospf6_area *oa;
  oa = ospf6_area_lookup (area_id, o);
  if (oa == NULL)
    oa = ospf6_area_create (area_id, o);
  return oa;
}

void
ospf6_area_enable (struct ospf6_area *oa)
{
  listnode i;
  struct ospf6_interface *oi;

  SET_FLAG (oa->flag, OSPF6_AREA_ENABLE);

  for (i = listhead (oa->if_list); i; nextnode (i))
    {
      oi = (struct ospf6_interface *) getdata (i);
      ospf6_interface_enable (oi);
    }
}

void
ospf6_area_disable (struct ospf6_area *oa)
{
  listnode i;
  struct ospf6_interface *oi;

  UNSET_FLAG (oa->flag, OSPF6_AREA_ENABLE);

  for (i = listhead (oa->if_list); i; nextnode (i))
    {
      oi = (struct ospf6_interface *) getdata (i);
      ospf6_interface_disable (oi);
    }
}


void
ospf6_area_show (struct vty *vty, struct ospf6_area *oa)
{
  listnode i;
  struct ospf6_interface *oi;

  vty_out (vty, " Area %s%s", oa->name, VNL);
  vty_out (vty, "     Number of Area scoped LSAs is %u%s",
           oa->lsdb->count, VNL);

  vty_out (vty, "     Interface attached to this area:");
  for (i = listhead (oa->if_list); i; nextnode (i))
    {
      oi = (struct ospf6_interface *) getdata (i);
      vty_out (vty, " %s", oi->interface->name);
    }
  vty_out (vty, "%s", VNL);
}


#define OSPF6_CMD_AREA_LOOKUP(str, oa)                     \
{                                                          \