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 along
  18  * with this program; see the file COPYING; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include <zebra.h>
  23
  24 #include "thread.h"
  25 #include "memory.h"
  26 #include "linklist.h"
  27 #include "prefix.h"
  28 #include "if.h"
  29 #include "table.h"
  30 #include "vty.h"
  31 #include "filter.h"
  32 #include "log.h"
  33
  34 #include "ospfd/ospfd.h"
  35 #include "ospfd/ospf_interface.h"
  36 #include "ospfd/ospf_asbr.h"
  37 #include "ospfd/ospf_lsa.h"
  38 #include "ospfd/ospf_lsdb.h"
  39 #include "ospfd/ospf_neighbor.h"
  40 #include "ospfd/ospf_spf.h"
  41 #include "ospfd/ospf_flood.h"
  42 #include "ospfd/ospf_route.h"
  43 #include "ospfd/ospf_zebra.h"
  44 #include "ospfd/ospf_dump.h"
  45
  46
  47 /* Remove external route. */
  48 void ospf_external_route_remove(struct ospf *ospf, struct prefix_ipv4 *p)
  49 {
  50         struct route_node *rn;
  51         struct ospf_route * or ;
  52
  53         rn = route_node_lookup(ospf->old_external_route, (struct prefix *)p);
  54         if (rn)
  55                 if ((or = rn->info)) {
  56                         zlog_info("Route[%s/%d]: external path deleted",
  57                                   inet_ntoa(p->prefix), p->prefixlen);
  58
  59                         /* Remove route from zebra. */
  60                         if (or->type == OSPF_DESTINATION_NETWORK)
  61                                 ospf_zebra_delete(ospf,
  62                                                   (struct prefix_ipv4 *)&rn->p,
  63                                                   or);
  64
  65                         ospf_route_free(or);
  66                         rn->info = NULL;
  67
  68                         route_unlock_node(rn);
  69                         route_unlock_node(rn);
  70                         return;
  71                 }
  72
  73         zlog_info("Route[%s/%d]: no such external path", inet_ntoa(p->prefix),
  74                   p->prefixlen);
  75 }
  76
  77 /* Lookup external route. */
  78 struct ospf_route *ospf_external_route_lookup(struct ospf *ospf,
  79                                               struct prefix_ipv4 *p)
  80 {
  81         struct route_node *rn;
  82
  83         rn = route_node_lookup(ospf->old_external_route, (struct prefix *)p);
  84         if (rn) {
  85                 route_unlock_node(rn);
  86                 if (rn->info)
  87                         return rn->info;
  88         }
  89
  90         zlog_warn("Route[%s/%d]: lookup, no such prefix", inet_ntoa(p->prefix),
  91                   p->prefixlen);
  92
  93         return NULL;
  94 }
  95
  96
  97 /* Add an External info for AS-external-LSA. */
  98 struct external_info *ospf_external_info_new(u_char type, u_short instance)
  99 {
 100         struct external_info *new;
 101
 102         new = (struct external_info *)XCALLOC(MTYPE_OSPF_EXTERNAL_INFO,
 103                                               sizeof(struct external_info));
 104         new->type = type;
 105         new->instance = instance;
 106
 107         ospf_reset_route_map_set_values(&new->route_map_set);
 108         return new;
 109 }
 110
 111 static void ospf_external_info_free(struct external_info *ei)
 112 {
 113         XFREE(MTYPE_OSPF_EXTERNAL_INFO, ei);
 114 }
 115
 116 void ospf_reset_route_map_set_values(struct route_map_set_values *values)
 117 {
 118         values->metric = -1;
 119         values->metric_type = -1;
 120 }
 121
 122 int ospf_route_map_set_compare(struct route_map_set_values *values1,
 123                                struct route_map_set_values *values2)
 124 {
 125         return values1->metric == values2->metric
 126                && values1->metric_type == values2->metric_type;
 127 }
 128
 129 /* Add an External info for AS-external-LSA. */
 130 struct external_info *ospf_external_info_add(struct ospf *ospf, u_char type,
 131                                              u_short instance,
 132                                              struct prefix_ipv4 p,
 133                                              ifindex_t ifindex,
 134                                              struct in_addr nexthop,
 135                                              route_tag_t tag)
 136 {
 137         struct external_info *new;
 138         struct route_node *rn;
 139         struct ospf_external *ext;
 140         char inetbuf[INET6_BUFSIZ];
 141
 142         ext = ospf_external_lookup(ospf, type, instance);
 143         if (!ext)
 144                 ext = ospf_external_add(ospf, type, instance);
 145
 146         rn = route_node_get(EXTERNAL_INFO(ext), (struct prefix *)&p);
 147         /* If old info exists, -- discard new one or overwrite with new one? */
 148         if (rn)
 149                 if (rn->info) {
 150                         new = rn->info;
 151                         if ((new->ifindex == ifindex)
 152                             && (new->nexthop.s_addr == nexthop.s_addr)
 153                             && (new->tag == tag)) {
 154                                 route_unlock_node(rn);
 155                                 return NULL; /* NULL => no LSA to refresh */
 156                         }
 157
 158                         inet_ntop(AF_INET, (void *)&nexthop.s_addr, inetbuf,
 159                                   INET6_BUFSIZ);
 160                         zlog_warn(
 161                                 "Redistribute[%s][%d][%u]: %s/%d discarding old info with NH %s.",
 162                                 ospf_redist_string(type), instance,
 163                                 ospf->vrf_id, inet_ntoa(p.prefix),
 164                                 p.prefixlen, inetbuf);
 165                         XFREE(MTYPE_OSPF_EXTERNAL_INFO, rn->info);
 166                         rn->info = NULL;
 167                 }
 168
 169         /* Create new External info instance. */
 170         new = ospf_external_info_new(type, instance);
 171         new->p = p;
 172         new->ifindex = ifindex;
 173         new->nexthop = nexthop;
 174         new->tag = tag;
 175
 176         /* we don't unlock rn from the get() because we're attaching the info */
 177         if (rn)
 178                 rn->info = new;
 179
 180         if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) {
 181                 inet_ntop(AF_INET, (void *)&nexthop.s_addr, inetbuf,
 182                           INET6_BUFSIZ);
 183                 zlog_debug(
 184                         "Redistribute[%s][%u]: %s/%d external info created, with NH %s",
 185                         ospf_redist_string(type), ospf->vrf_id,
 186                         inet_ntoa(p.prefix), p.prefixlen, inetbuf);
 187         }
 188         return new;
 189 }
 190
 191 void ospf_external_info_delete(struct ospf *ospf, u_char type, u_short instance,
 192                                struct prefix_ipv4 p)
 193 {
 194         struct route_node *rn;
 195         struct ospf_external *ext;
 196
 197         ext = ospf_external_lookup(ospf, type, instance);
 198         if (!ext)
 199                 return;
 200
 201         rn = route_node_lookup(EXTERNAL_INFO(ext), (struct prefix *)&p);
 202         if (rn) {
 203                 ospf_external_info_free(rn->info);
 204                 rn->info = NULL;
 205                 route_unlock_node(rn);
 206                 route_unlock_node(rn);
 207         }
 208 }
 209
 210 struct external_info *ospf_external_info_lookup(struct ospf *ospf, u_char type,
 211                                                 u_short instance,
 212                                                 struct prefix_ipv4 *p)
 213 {
 214         struct route_node *rn;
 215         struct ospf_external *ext;
 216
 217         ext = ospf_external_lookup(ospf, type, instance);
 218         if (!ext)
 219                 return NULL;
 220
 221         rn = route_node_lookup(EXTERNAL_INFO(ext), (struct prefix *)p);
 222         if (rn) {
 223                 route_unlock_node(rn);
 224                 if (rn->info)
 225                         return rn->info;
 226         }
 227
 228         return NULL;
 229 }
 230
 231 struct ospf_lsa *ospf_external_info_find_lsa(struct ospf *ospf,
 232                                              struct prefix_ipv4 *p)
 233 {
 234         struct ospf_lsa *lsa;
 235         struct as_external_lsa *al;
 236         struct in_addr mask, id;
 237
 238         lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
 239                                      p->prefix, ospf->router_id);
 240
 241         if (!lsa)
 242                 return NULL;
 243
 244         al = (struct as_external_lsa *)lsa->data;
 245
 246         masklen2ip(p->prefixlen, &mask);
 247
 248         if (mask.s_addr != al->mask.s_addr) {
 249                 id.s_addr = p->prefix.s_addr | (~mask.s_addr);
 250                 lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
 251                                              id, ospf->router_id);
 252                 if (!lsa)
 253                         return NULL;
 254         }
 255
 256         return lsa;
 257 }
 258
 259
 260 /* Update ASBR status. */
 261 void ospf_asbr_status_update(struct ospf *ospf, u_char status)
 262 {
 263         zlog_info("ASBR[Status:%d]: Update", status);
 264
 265         /* ASBR on. */
 266         if (status) {
 267                 /* Already ASBR. */
 268                 if (IS_OSPF_ASBR(ospf)) {
 269                         zlog_info("ASBR[Status:%d]: Already ASBR", status);
 270                         return;
 271                 }
 272                 SET_FLAG(ospf->flags, OSPF_FLAG_ASBR);
 273         } else {
 274                 /* Already non ASBR. */
 275                 if (!IS_OSPF_ASBR(ospf)) {
 276                         zlog_info("ASBR[Status:%d]: Already non ASBR", status);
 277                         return;
 278                 }
 279                 UNSET_FLAG(ospf->flags, OSPF_FLAG_ASBR);
 280         }
 281
 282         /* Transition from/to status ASBR, schedule timer. */
 283         ospf_spf_calculate_schedule(ospf, SPF_FLAG_ASBR_STATUS_CHANGE);
 284         ospf_router_lsa_update(ospf);
 285 }
 286
 287 void ospf_redistribute_withdraw(struct ospf *ospf, u_char type,
 288                                 u_short instance)
 289 {
 290         struct route_node *rn;
 291         struct external_info *ei;
 292         struct ospf_external *ext;
 293
 294         ext = ospf_external_lookup(ospf, type, instance);
 295         if (!ext)
 296                 return;
 297
 298         /* Delete external info for specified type. */
 299         if (EXTERNAL_INFO(ext))
 300                 for (rn = route_top(EXTERNAL_INFO(ext)); rn;
 301                      rn = route_next(rn))
 302                         if ((ei = rn->info))
 303                                 if (ospf_external_info_find_lsa(ospf, &ei->p)) {
 304                                         if (is_prefix_default(&ei->p)
 305                                             && ospf->default_originate
 306                                                        != DEFAULT_ORIGINATE_NONE)
 307                                                 continue;
 308                                         ospf_external_lsa_flush(
 309                                                 ospf, type, &ei->p,
 310                                                 ei->ifindex /*, ei->nexthop */);
 311
 312                                         ospf_external_info_free(ei);
 313                                         route_unlock_node(rn);
 314                                         rn->info = NULL;
 315                                 }
 316 }