ospfd/ospf_asbr.c - quagga - Gitiles

 /*
  * OSPF AS Boundary Router functions.
  * Copyright (C) 1999, 2000 Kunihiro Ishiguro, 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 "log.h"

 #include "ospfd/ospfd.h"
 #include "ospfd/ospf_interface.h"
 #include "ospfd/ospf_asbr.h"
 #include "ospfd/ospf_lsa.h"
 #include "ospfd/ospf_lsdb.h"
 #include "ospfd/ospf_neighbor.h"
 #include "ospfd/ospf_spf.h"
 #include "ospfd/ospf_flood.h"
 #include "ospfd/ospf_route.h"
 #include "ospfd/ospf_zebra.h"
 #include "ospfd/ospf_dump.h"


 /* Remove external route. */
 void
 ospf_external_route_remove (struct ospf *ospf, struct prefix_ipv4 *p)
 {
   struct route_node *rn;
   struct ospf_route *or;

   rn = route_node_lookup (ospf->old_external_route, (struct prefix *) p);
   if (rn)
     if ((or = rn->info))
       {
 	zlog_info ("Route[%s/%d]: external path deleted",
 		   inet_ntoa (p->prefix), p->prefixlen);

 	/* Remove route from zebra. */
         if (or->type == OSPF_DESTINATION_NETWORK)
 	  ospf_zebra_delete ((struct prefix_ipv4 *) &rn->p, or);

 	ospf_route_free (or);
 	rn->info = NULL;

 	route_unlock_node (rn);
 	route_unlock_node (rn);
 	return;
       }

   zlog_info ("Route[%s/%d]: no such external path",
 	     inet_ntoa (p->prefix), p->prefixlen);
 }

 /* Lookup external route. */
 struct ospf_route *
 ospf_external_route_lookup (struct ospf *ospf,
 			    struct prefix_ipv4 *p)
 {
   struct route_node *rn;

   rn = route_node_lookup (ospf->old_external_route, (struct prefix *) p);
   if (rn)
     {
       route_unlock_node (rn);
       if (rn->info)
 	return rn->info;
     }

   zlog_warn ("Route[%s/%d]: lookup, no such prefix",
 	     inet_ntoa (p->prefix), p->prefixlen);

   return NULL;
 }


 /* Add an External info for AS-external-LSA. */
 struct external_info *
 ospf_external_info_new (u_char type)
 {
   struct external_info *new;

   new = (struct external_info *)
     XMALLOC (MTYPE_OSPF_EXTERNAL_INFO, sizeof (struct external_info));
   memset (new, 0, sizeof (struct external_info));
   new->type = type;

   ospf_reset_route_map_set_values (&new->route_map_set);
   return new;
 }

 static void
 ospf_external_info_free (struct external_info *ei)
 {
   XFREE (MTYPE_OSPF_EXTERNAL_INFO, ei);
 }

 void
 ospf_reset_route_map_set_values (struct route_map_set_values *values)
 {
   values->metric = -1;
   values->metric_type = -1;
 }

 int
 ospf_route_map_set_compare (struct route_map_set_values *values1,
 			    struct route_map_set_values *values2)
 {
   return values1->metric == values2->metric &&
     values1->metric_type == values2->metric_type;
 }

 /* Add an External info for AS-external-LSA. */
 struct external_info *
 ospf_external_info_add (u_char type, struct prefix_ipv4 p,
 			unsigned int ifindex, struct in_addr nexthop)
 {
   struct external_info *new;
   struct route_node *rn;

   /* Initialize route table. */
   if (EXTERNAL_INFO (type) == NULL)
     EXTERNAL_INFO (type) = route_table_init ();

   rn = route_node_get (EXTERNAL_INFO (type), (struct prefix *) &p);
   /* If old info exists, -- discard new one or overwrite with new one? */
   if (rn)
     if (rn->info)
       {
 	route_unlock_node (rn);
 	zlog_warn ("Redistribute[%s]: %s/%d already exists, discard.",
 		   ospf_redist_string(type),
 		   inet_ntoa (p.prefix), p.prefixlen);
 	/* XFREE (MTYPE_OSPF_TMP, rn->info); */
 	return rn->info;
       }

   /* Create new External info instance. */
   new = ospf_external_info_new (type);
   new->p = p;
   new->ifindex = ifindex;
   new->nexthop = nexthop;
   new->tag = 0;

   rn->info = new;

   if (IS_DEBUG_OSPF (lsa, LSA_GENERATE))
     zlog_debug ("Redistribute[%s]: %s/%d external info created.",
 	       ospf_redist_string(type),
 	       inet_ntoa (p.prefix), p.prefixlen);
   return new;
 }

 void
 ospf_external_info_delete (u_char type, struct prefix_ipv4 p)
 {
   struct route_node *rn;

   rn = route_node_lookup (EXTERNAL_INFO (type), (struct prefix *) &p);
   if (rn)
     {
       ospf_external_info_free (rn->info);
       rn->info = NULL;
       route_unlock_node (rn);
       route_unlock_node (rn);
     }
 }

 struct external_info *
 ospf_external_info_lookup (u_char type, struct prefix_ipv4 *p)
 {
   struct route_node *rn;
   rn = route_node_lookup (EXTERNAL_INFO (type), (struct prefix *) p);
   if (rn)
     {
       route_unlock_node (rn);
       if (rn->info)
 	return rn->info;
     }

   return NULL;
 }

 struct ospf_lsa *
 ospf_external_info_find_lsa (struct ospf *ospf,
 			     struct prefix_ipv4 *p)
 {
   struct ospf_lsa *lsa;
   struct as_external_lsa *al;
   struct in_addr mask, id;

   lsa = ospf_lsdb_lookup_by_id (ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
 				p->prefix, ospf->router_id);

   if (!lsa)
     return NULL;

   al = (struct as_external_lsa *) lsa->data;

   masklen2ip (p->prefixlen, &mask);

   if (mask.s_addr != al->mask.s_addr)
     {
       id.s_addr = p->prefix.s_addr | (~mask.s_addr);
       lsa = ospf_lsdb_lookup_by_id (ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
 				   id, ospf->router_id);
       if (!lsa)
 	return NULL;
     }

   return lsa;
 }


 /* Update ASBR status. */
 void
 ospf_asbr_status_update (struct ospf *ospf, u_char status)
 {
   zlog_info ("ASBR[Status:%d]: Update", status);

   /* ASBR on. */
   if (status)
     {
       /* Already ASBR. */
       if (IS_OSPF_ASBR (ospf))
 	{
 	  zlog_info ("ASBR[Status:%d]: Already ASBR", status);
 	  return;
 	}
       SET_FLAG (ospf->flags, OSPF_FLAG_ASBR);
     }
   else
     {
       /* Already non ASBR. */
       if (! IS_OSPF_ASBR (ospf))
 	{
 	  zlog_info ("ASBR[Status:%d]: Already non ASBR", status);
 	  return;
 	}
       UNSET_FLAG (ospf->flags, OSPF_FLAG_ASBR);
     }

   /* Transition from/to status ASBR, schedule timer. */
   ospf_spf_calculate_schedule (ospf);
   OSPF_TIMER_ON (ospf->t_router_lsa_update,
 		 ospf_router_lsa_update_timer, OSPF_LSA_UPDATE_DELAY);
 }

 void
 ospf_redistribute_withdraw (struct ospf *ospf, u_char type)
 {
   struct route_node *rn;
   struct external_info *ei;

   /* Delete external info for specified type. */
   if (EXTERNAL_INFO (type))
     for (rn = route_top (EXTERNAL_INFO (type)); rn; rn = route_next (rn))
       if ((ei = rn->info))
 	if (ospf_external_info_find_lsa (ospf, &ei->p))
 	  {
 	    if (is_prefix_default (&ei->p) &&
 		ospf->default_originate != DEFAULT_ORIGINATE_NONE)
 	      continue;
 	    ospf_external_lsa_flush (ospf, type, &ei->p,
 				     ei->ifindex /*, ei->nexthop */);
 	    ospf_external_info_delete (type, ei->p);
 	  }
 }
	/*
	* OSPF AS Boundary Router functions.
	* Copyright (C) 1999, 2000 Kunihiro Ishiguro, 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 "log.h"

	#include "ospfd/ospfd.h"
	#include "ospfd/ospf_interface.h"
	#include "ospfd/ospf_asbr.h"
	#include "ospfd/ospf_lsa.h"
	#include "ospfd/ospf_lsdb.h"
	#include "ospfd/ospf_neighbor.h"
	#include "ospfd/ospf_spf.h"
	#include "ospfd/ospf_flood.h"
	#include "ospfd/ospf_route.h"
	#include "ospfd/ospf_zebra.h"
	#include "ospfd/ospf_dump.h"


	/* Remove external route. */
	void
	ospf_external_route_remove (struct ospf ospf, struct prefix_ipv4 p)
	{
	struct route_node *rn;
	struct ospf_route *or;

	rn = route_node_lookup (ospf->old_external_route, (struct prefix *) p);
	if (rn)
	if ((or = rn->info))
	{
	zlog_info ("Route[%s/%d]: external path deleted",
	inet_ntoa (p->prefix), p->prefixlen);

	/* Remove route from zebra. */
	if (or->type == OSPF_DESTINATION_NETWORK)
	ospf_zebra_delete ((struct prefix_ipv4 *) &rn->p, or);

	ospf_route_free (or);
	rn->info = NULL;

	route_unlock_node (rn);
	route_unlock_node (rn);
	return;
	}

	zlog_info ("Route[%s/%d]: no such external path",
	inet_ntoa (p->prefix), p->prefixlen);
	}

	/* Lookup external route. */
	struct ospf_route *
	ospf_external_route_lookup (struct ospf *ospf,
	struct prefix_ipv4 *p)
	{
	struct route_node *rn;

	rn = route_node_lookup (ospf->old_external_route, (struct prefix *) p);
	if (rn)
	{
	route_unlock_node (rn);
	if (rn->info)
	return rn->info;
	}

	zlog_warn ("Route[%s/%d]: lookup, no such prefix",
	inet_ntoa (p->prefix), p->prefixlen);

	return NULL;
	}


	/* Add an External info for AS-external-LSA. */
	struct external_info *
	ospf_external_info_new (u_char type)
	{
	struct external_info *new;

	new = (struct external_info *)
	XMALLOC (MTYPE_OSPF_EXTERNAL_INFO, sizeof (struct external_info));
	memset (new, 0, sizeof (struct external_info));
	new->type = type;

	ospf_reset_route_map_set_values (&new->route_map_set);
	return new;
	}

	static void
	ospf_external_info_free (struct external_info *ei)
	{
	XFREE (MTYPE_OSPF_EXTERNAL_INFO, ei);
	}

	void
	ospf_reset_route_map_set_values (struct route_map_set_values *values)
	{
	values->metric = -1;
	values->metric_type = -1;
	}

	int
	ospf_route_map_set_compare (struct route_map_set_values *values1,
	struct route_map_set_values *values2)
	{
	return values1->metric == values2->metric &&
	values1->metric_type == values2->metric_type;
	}

	/* Add an External info for AS-external-LSA. */
	struct external_info *
	ospf_external_info_add (u_char type, struct prefix_ipv4 p,
	unsigned int ifindex, struct in_addr nexthop)
	{
	struct external_info *new;
	struct route_node *rn;

	/* Initialize route table. */
	if (EXTERNAL_INFO (type) == NULL)
	EXTERNAL_INFO (type) = route_table_init ();

	rn = route_node_get (EXTERNAL_INFO (type), (struct prefix *) &p);
	/* If old info exists, -- discard new one or overwrite with new one? */
	if (rn)
	if (rn->info)
	{
	route_unlock_node (rn);
	zlog_warn ("Redistribute[%s]: %s/%d already exists, discard.",
	ospf_redist_string(type),
	inet_ntoa (p.prefix), p.prefixlen);
	/* XFREE (MTYPE_OSPF_TMP, rn->info); */
	return rn->info;
	}

	/* Create new External info instance. */
	new = ospf_external_info_new (type);
	new->p = p;
	new->ifindex = ifindex;
	new->nexthop = nexthop;
	new->tag = 0;

	rn->info = new;

	if (IS_DEBUG_OSPF (lsa, LSA_GENERATE))
	zlog_debug ("Redistribute[%s]: %s/%d external info created.",
	ospf_redist_string(type),
	inet_ntoa (p.prefix), p.prefixlen);
	return new;
	}

	void
	ospf_external_info_delete (u_char type, struct prefix_ipv4 p)
	{
	struct route_node *rn;

	rn = route_node_lookup (EXTERNAL_INFO (type), (struct prefix *) &p);
	if (rn)
	{
	ospf_external_info_free (rn->info);
	rn->info = NULL;
	route_unlock_node (rn);
	route_unlock_node (rn);
	}
	}

	struct external_info *
	ospf_external_info_lookup (u_char type, struct prefix_ipv4 *p)
	{
	struct route_node *rn;
	rn = route_node_lookup (EXTERNAL_INFO (type), (struct prefix *) p);
	if (rn)
	{
	route_unlock_node (rn);
	if (rn->info)
	return rn->info;
	}

	return NULL;
	}

	struct ospf_lsa *
	ospf_external_info_find_lsa (struct ospf *ospf,
	struct prefix_ipv4 *p)
	{
	struct ospf_lsa *lsa;
	struct as_external_lsa *al;
	struct in_addr mask, id;

	lsa = ospf_lsdb_lookup_by_id (ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
	p->prefix, ospf->router_id);

	if (!lsa)
	return NULL;

	al = (struct as_external_lsa *) lsa->data;

	masklen2ip (p->prefixlen, &mask);

	if (mask.s_addr != al->mask.s_addr)
	{
	id.s_addr = p->prefix.s_addr \| (~mask.s_addr);
	lsa = ospf_lsdb_lookup_by_id (ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
	id, ospf->router_id);
	if (!lsa)
	return NULL;
	}

	return lsa;
	}


	/* Update ASBR status. */
	void
	ospf_asbr_status_update (struct ospf *ospf, u_char status)
	{
	zlog_info ("ASBR[Status:%d]: Update", status);

	/* ASBR on. */
	if (status)
	{
	/* Already ASBR. */
	if (IS_OSPF_ASBR (ospf))
	{
	zlog_info ("ASBR[Status:%d]: Already ASBR", status);
	return;
	}
	SET_FLAG (ospf->flags, OSPF_FLAG_ASBR);
	}
	else
	{
	/* Already non ASBR. */
	if (! IS_OSPF_ASBR (ospf))
	{
	zlog_info ("ASBR[Status:%d]: Already non ASBR", status);
	return;
	}
	UNSET_FLAG (ospf->flags, OSPF_FLAG_ASBR);
	}

	/* Transition from/to status ASBR, schedule timer. */
	ospf_spf_calculate_schedule (ospf);
	OSPF_TIMER_ON (ospf->t_router_lsa_update,
	ospf_router_lsa_update_timer, OSPF_LSA_UPDATE_DELAY);
	}

	void
	ospf_redistribute_withdraw (struct ospf *ospf, u_char type)
	{
	struct route_node *rn;
	struct external_info *ei;

	/* Delete external info for specified type. */
	if (EXTERNAL_INFO (type))
	for (rn = route_top (EXTERNAL_INFO (type)); rn; rn = route_next (rn))
	if ((ei = rn->info))
	if (ospf_external_info_find_lsa (ospf, &ei->p))
	{
	if (is_prefix_default (&ei->p) &&
	ospf->default_originate != DEFAULT_ORIGINATE_NONE)
	continue;
	ospf_external_lsa_flush (ospf, type, &ei->p,
	ei->ifindex /, ei->nexthop /);
	ospf_external_info_delete (type, ei->p);
	}
	}