ospfd/ospf_asbr.c

   1 /*
   2  * OSPF AS Boundary Router functions.
   3  * Copyright (C) 1999, 2000 Kunihiro Ishiguro, Toshiaki Takada
   4  *
   5  * This file is part of GNU Zebra.
   6  *
   7  * GNU Zebra is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * GNU Zebra is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  19  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  20  * 02111-1307, USA.
  21  */
  22
  23 #include <zebra.h>
  24
  25 #include "thread.h"
  26 #include "memory.h"
  27 #include "linklist.h"
  28 #include "prefix.h"
  29 #include "if.h"
  30 #include "table.h"
  31 #include "vty.h"
  32 #include "filter.h"
  33 #include "log.h"
  34
  35 #include "ospfd/ospfd.h"
  36 #include "ospfd/ospf_interface.h"
  37 #include "ospfd/ospf_asbr.h"
  38 #include "ospfd/ospf_lsa.h"
  39 #include "ospfd/ospf_lsdb.h"
  40 #include "ospfd/ospf_neighbor.h"
  41 #include "ospfd/ospf_spf.h"
  42 #include "ospfd/ospf_flood.h"
  43 #include "ospfd/ospf_route.h"
  44 #include "ospfd/ospf_zebra.h"
  45 #include "ospfd/ospf_dump.h"
  46
  47 \f
  48 /* Remove external route. */
  49 void
  50 ospf_external_route_remove (struct ospf *ospf, struct prefix_ipv4 *p)
  51 {
  52   struct route_node *rn;
  53   struct ospf_route *or;
  54
  55   rn = route_node_lookup (ospf->old_external_route, (struct prefix *) p);
  56   if (rn)
  57     if ((or = rn->info))
  58       {
  59         zlog_info ("Route[%s/%d]: external path deleted",
  60                    inet_ntoa (p->prefix), p->prefixlen);
  61
  62         /* Remove route from zebra. */
  63         if (or->type == OSPF_DESTINATION_NETWORK)
  64           ospf_zebra_delete ((struct prefix_ipv4 *) &rn->p, or);
  65
  66         ospf_route_free (or);
  67         rn->info = NULL;
  68
  69         route_unlock_node (rn);
  70         route_unlock_node (rn);
  71         return;
  72       }
  73
  74   zlog_info ("Route[%s/%d]: no such external path",
  75              inet_ntoa (p->prefix), p->prefixlen);
  76 }
  77
  78 /* Lookup external route. */
  79 struct ospf_route *
  80 ospf_external_route_lookup (struct ospf *ospf,
  81                             struct prefix_ipv4 *p)
  82 {
  83   struct route_node *rn;
  84
  85   rn = route_node_lookup (ospf->old_external_route, (struct prefix *) p);
  86   if (rn)
  87     {
  88       route_unlock_node (rn);
  89       if (rn->info)
  90         return rn->info;
  91     }
  92
  93   zlog_warn ("Route[%s/%d]: lookup, no such prefix",
  94              inet_ntoa (p->prefix), p->prefixlen);
  95
  96   return NULL;
  97 }
  98
  99 \f
 100 /* Add an External info for AS-external-LSA. */
 101 struct external_info *
 102 ospf_external_info_new (u_char type)
 103 {
 104   struct external_info *new;
 105
 106   new = (struct external_info *)
 107     XCALLOC (MTYPE_OSPF_EXTERNAL_INFO, sizeof (struct external_info));
 108   new->type = type;
 109
 110   ospf_reset_route_map_set_values (&new->route_map_set);
 111   return new;
 112 }
 113
 114 static void
 115 ospf_external_info_free (struct external_info *ei)
 116 {
 117   XFREE (MTYPE_OSPF_EXTERNAL_INFO, ei);
 118 }
 119
 120 void
 121 ospf_reset_route_map_set_values (struct route_map_set_values *values)
 122 {
 123   values->metric = -1;
 124   values->metric_type = -1;
 125 }
 126
 127 int
 128 ospf_route_map_set_compare (struct route_map_set_values *values1,
 129                             struct route_map_set_values *values2)
 130 {
 131   return values1->metric == values2->metric &&
 132     values1->metric_type == values2->metric_type;
 133 }
 134
 135 /* Add an External info for AS-external-LSA. */
 136 struct external_info *
 137 ospf_external_info_add (u_char type, struct prefix_ipv4 p,
 138                         unsigned int ifindex, struct in_addr nexthop)
 139 {
 140   struct external_info *new;
 141   struct route_node *rn;
 142
 143   /* Initialize route table. */
 144   if (EXTERNAL_INFO (type) == NULL)
 145     EXTERNAL_INFO (type) = route_table_init ();
 146
 147   rn = route_node_get (EXTERNAL_INFO (type), (struct prefix *) &p);
 148   /* If old info exists, -- discard new one or overwrite with new one? */
 149   if (rn)
 150     if (rn->info)
 151       {
 152         route_unlock_node (rn);
 153         zlog_warn ("Redistribute[%s]: %s/%d already exists, discard.",
 154                    ospf_redist_string(type),
 155                    inet_ntoa (p.prefix), p.prefixlen);
 156         /* XFREE (MTYPE_OSPF_TMP, rn->info); */
 157         return rn->info;
 158       }
 159
 160   /* Create new External info instance. */
 161   new = ospf_external_info_new (type);
 162   new->p = p;
 163   new->ifindex = ifindex;
 164   new->nexthop = nexthop;
 165   new->tag = 0;
 166
 167   rn->info = new;
 168
 169   if (IS_DEBUG_OSPF (lsa, LSA_GENERATE))
 170     zlog_debug ("Redistribute[%s]: %s/%d external info created.",
 171                ospf_redist_string(type),
 172                inet_ntoa (p.prefix), p.prefixlen);
 173   return new;
 174 }
 175
 176 void
 177 ospf_external_info_delete (u_char type, struct prefix_ipv4 p)
 178 {
 179   struct route_node *rn;
 180
 181   rn = route_node_lookup (EXTERNAL_INFO (type), (struct prefix *) &p);
 182   if (rn)
 183     {
 184       ospf_external_info_free (rn->info);
 185       rn->info = NULL;
 186       route_unlock_node (rn);
 187       route_unlock_node (rn);
 188     }
 189 }
 190
 191 struct external_info *
 192 ospf_external_info_lookup (u_char type, struct prefix_ipv4 *p)
 193 {
 194   struct route_node *rn;
 195   rn = route_node_lookup (EXTERNAL_INFO (type), (struct prefix *) p);
 196   if (rn)
 197     {
 198       route_unlock_node (rn);
 199       if (rn->info)
 200         return rn->info;
 201     }
 202
 203   return NULL;
 204 }
 205
 206 struct ospf_lsa *
 207 ospf_external_info_find_lsa (struct ospf *ospf,
 208                              struct prefix_ipv4 *p)
 209 {
 210   struct ospf_lsa *lsa;
 211   struct as_external_lsa *al;
 212   struct in_addr mask, id;
 213
 214   lsa = ospf_lsdb_lookup_by_id (ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
 215                                 p->prefix, ospf->router_id);
 216
 217   if (!lsa)
 218     return NULL;
 219
 220   al = (struct as_external_lsa *) lsa->data;
 221
 222   masklen2ip (p->prefixlen, &mask);
 223
 224   if (mask.s_addr != al->mask.s_addr)
 225     {
 226       id.s_addr = p->prefix.s_addr | (~mask.s_addr);
 227       lsa = ospf_lsdb_lookup_by_id (ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
 228                                    id, ospf->router_id);
 229       if (!lsa)
 230         return NULL;
 231     }
 232
 233   return lsa;
 234 }
 235
 236 \f
 237 /* Update ASBR status. */
 238 void
 239 ospf_asbr_status_update (struct ospf *ospf, u_char status)
 240 {
 241   zlog_info ("ASBR[Status:%d]: Update", status);
 242
 243   /* ASBR on. */
 244   if (status)
 245     {
 246       /* Already ASBR. */
 247       if (IS_OSPF_ASBR (ospf))
 248         {
 249           zlog_info ("ASBR[Status:%d]: Already ASBR", status);
 250           return;
 251         }
 252       SET_FLAG (ospf->flags, OSPF_FLAG_ASBR);
 253     }
 254   else
 255     {
 256       /* Already non ASBR. */
 257       if (! IS_OSPF_ASBR (ospf))
 258         {
 259           zlog_info ("ASBR[Status:%d]: Already non ASBR", status);
 260           return;
 261         }
 262       UNSET_FLAG (ospf->flags, OSPF_FLAG_ASBR);
 263     }
 264
 265   /* Transition from/to status ASBR, schedule timer. */
 266   ospf_spf_calculate_schedule (ospf);
 267   OSPF_TIMER_ON (ospf->t_router_lsa_update,
 268                  ospf_router_lsa_update_timer, OSPF_LSA_UPDATE_DELAY);
 269 }
 270
 271 void
 272 ospf_redistribute_withdraw (struct ospf *ospf, u_char type)
 273 {
 274   struct route_node *rn;
 275   struct external_info *ei;
 276
 277   /* Delete external info for specified type. */
 278   if (EXTERNAL_INFO (type))
 279     for (rn = route_top (EXTERNAL_INFO (type)); rn; rn = route_next (rn))
 280       if ((ei = rn->info))
 281         if (ospf_external_info_find_lsa (ospf, &ei->p))
 282           {
 283             if (is_prefix_default (&ei->p) &&
 284                 ospf->default_originate != DEFAULT_ORIGINATE_NONE)
 285               continue;
 286             ospf_external_lsa_flush (ospf, type, &ei->p,
 287                                      ei->ifindex /*, ei->nexthop */);
 288
 289             ospf_external_info_free (ei);
 290             route_unlock_node (rn);
 291             rn->info = NULL;
 292           }
 293 }