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     XMALLOC (MTYPE_OSPF_EXTERNAL_INFO, sizeof (struct external_info));
 108   memset (new, 0, sizeof (struct external_info));
 109   new->type = type;
 110
 111   ospf_reset_route_map_set_values (&new->route_map_set);
 112   return new;
 113 }
 114
 115 static void
 116 ospf_external_info_free (struct external_info *ei)
 117 {
 118   XFREE (MTYPE_OSPF_EXTERNAL_INFO, ei);
 119 }
 120
 121 void
 122 ospf_reset_route_map_set_values (struct route_map_set_values *values)
 123 {
 124   values->metric = -1;
 125   values->metric_type = -1;
 126 }
 127
 128 int
 129 ospf_route_map_set_compare (struct route_map_set_values *values1,
 130                             struct route_map_set_values *values2)
 131 {
 132   return values1->metric == values2->metric &&
 133     values1->metric_type == values2->metric_type;
 134 }
 135
 136 /* Add an External info for AS-external-LSA. */
 137 struct external_info *
 138 ospf_external_info_add (u_char type, struct prefix_ipv4 p,
 139                         unsigned int ifindex, struct in_addr nexthop)
 140 {
 141   struct external_info *new;
 142   struct route_node *rn;
 143
 144   /* Initialize route table. */
 145   if (EXTERNAL_INFO (type) == NULL)
 146     EXTERNAL_INFO (type) = route_table_init ();
 147
 148   rn = route_node_get (EXTERNAL_INFO (type), (struct prefix *) &p);
 149   /* If old info exists, -- discard new one or overwrite with new one? */
 150   if (rn)
 151     if (rn->info)
 152       {
 153         route_unlock_node (rn);
 154         zlog_warn ("Redistribute[%s]: %s/%d already exists, discard.",
 155                    ospf_redist_string(type),
 156                    inet_ntoa (p.prefix), p.prefixlen);
 157         /* XFREE (MTYPE_OSPF_TMP, rn->info); */
 158         return rn->info;
 159       }
 160
 161   /* Create new External info instance. */
 162   new = ospf_external_info_new (type);
 163   new->p = p;
 164   new->ifindex = ifindex;
 165   new->nexthop = nexthop;
 166   new->tag = 0;
 167
 168   rn->info = new;
 169
 170   if (IS_DEBUG_OSPF (lsa, LSA_GENERATE))
 171     zlog_debug ("Redistribute[%s]: %s/%d external info created.",
 172                ospf_redist_string(type),
 173                inet_ntoa (p.prefix), p.prefixlen);
 174   return new;
 175 }
 176
 177 void
 178 ospf_external_info_delete (u_char type, struct prefix_ipv4 p)
 179 {
 180   struct route_node *rn;
 181
 182   rn = route_node_lookup (EXTERNAL_INFO (type), (struct prefix *) &p);
 183   if (rn)
 184     {
 185       ospf_external_info_free (rn->info);
 186       rn->info = NULL;
 187       route_unlock_node (rn);
 188       route_unlock_node (rn);
 189     }
 190 }
 191
 192 struct external_info *
 193 ospf_external_info_lookup (u_char type, struct prefix_ipv4 *p)
 194 {
 195   struct route_node *rn;
 196   rn = route_node_lookup (EXTERNAL_INFO (type), (struct prefix *) p);
 197   if (rn)
 198     {
 199       route_unlock_node (rn);
 200       if (rn->info)
 201         return rn->info;
 202     }
 203
 204   return NULL;
 205 }
 206
 207 struct ospf_lsa *
 208 ospf_external_info_find_lsa (struct ospf *ospf,
 209                              struct prefix_ipv4 *p)
 210 {
 211   struct ospf_lsa *lsa;
 212   struct as_external_lsa *al;
 213   struct in_addr mask, id;
 214
 215   lsa = ospf_lsdb_lookup_by_id (ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
 216                                 p->prefix, ospf->router_id);
 217
 218   if (!lsa)
 219     return NULL;
 220
 221   al = (struct as_external_lsa *) lsa->data;
 222
 223   masklen2ip (p->prefixlen, &mask);
 224
 225   if (mask.s_addr != al->mask.s_addr)
 226     {
 227       id.s_addr = p->prefix.s_addr | (~mask.s_addr);
 228       lsa = ospf_lsdb_lookup_by_id (ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
 229                                    id, ospf->router_id);
 230       if (!lsa)
 231         return NULL;
 232     }
 233
 234   return lsa;
 235 }
 236
 237 \f
 238 /* Update ASBR status. */
 239 void
 240 ospf_asbr_status_update (struct ospf *ospf, u_char status)
 241 {
 242   zlog_info ("ASBR[Status:%d]: Update", status);
 243
 244   /* ASBR on. */
 245   if (status)
 246     {
 247       /* Already ASBR. */
 248       if (IS_OSPF_ASBR (ospf))
 249         {
 250           zlog_info ("ASBR[Status:%d]: Already ASBR", status);
 251           return;
 252         }
 253       SET_FLAG (ospf->flags, OSPF_FLAG_ASBR);
 254     }
 255   else
 256     {
 257       /* Already non ASBR. */
 258       if (! IS_OSPF_ASBR (ospf))
 259         {
 260           zlog_info ("ASBR[Status:%d]: Already non ASBR", status);
 261           return;
 262         }
 263       UNSET_FLAG (ospf->flags, OSPF_FLAG_ASBR);
 264     }
 265
 266   /* Transition from/to status ASBR, schedule timer. */
 267   ospf_spf_calculate_schedule (ospf);
 268   OSPF_TIMER_ON (ospf->t_router_lsa_update,
 269                  ospf_router_lsa_update_timer, OSPF_LSA_UPDATE_DELAY);
 270 }
 271
 272 void
 273 ospf_redistribute_withdraw (u_char type)
 274 {
 275   struct ospf *ospf;
 276   struct route_node *rn;
 277   struct external_info *ei;
 278
 279   ospf = ospf_lookup ();
 280
 281   /* Delete external info for specified type. */
 282   if (EXTERNAL_INFO (type))
 283     for (rn = route_top (EXTERNAL_INFO (type)); rn; rn = route_next (rn))
 284       if ((ei = rn->info))
 285         if (ospf_external_info_find_lsa (ospf, &ei->p))
 286           {
 287             if (is_prefix_default (&ei->p) &&
 288                 ospf->default_originate != DEFAULT_ORIGINATE_NONE)
 289               continue;
 290             ospf_external_lsa_flush (ospf, type, &ei->p,
 291                                      ei->ifindex /*, ei->nexthop */);
 292             ospf_external_info_delete (type, ei->p);
 293           }
 294 }