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(
  62                                         ospf, (struct prefix_ipv4 *)&rn->p, or);
  63
  64                         ospf_route_free(or);
  65                         rn->info = NULL;
  66
  67                         route_unlock_node(rn);
  68                         route_unlock_node(rn);
  69                         return;
  70                 }
  71
  72         zlog_info("Route[%s/%d]: no such external path", inet_ntoa(p->prefix),
  73                   p->prefixlen);
  74 }
  75
  76 /* Add an External info for AS-external-LSA. */
  77 struct external_info *ospf_external_info_new(uint8_t type,
  78                                              unsigned short instance)
  79 {
  80         struct external_info *new;
  81
  82         new = (struct external_info *)XCALLOC(MTYPE_OSPF_EXTERNAL_INFO,
  83                                               sizeof(struct external_info));
  84         new->type = type;
  85         new->instance = instance;
  86
  87         ospf_reset_route_map_set_values(&new->route_map_set);
  88         return new;
  89 }
  90
  91 static void ospf_external_info_free(struct external_info *ei)
  92 {
  93         XFREE(MTYPE_OSPF_EXTERNAL_INFO, ei);
  94 }
  95
  96 void ospf_reset_route_map_set_values(struct route_map_set_values *values)
  97 {
  98         values->metric = -1;
  99         values->metric_type = -1;
 100 }
 101
 102 int ospf_route_map_set_compare(struct route_map_set_values *values1,
 103                                struct route_map_set_values *values2)
 104 {
 105         return values1->metric == values2->metric
 106                && values1->metric_type == values2->metric_type;
 107 }
 108
 109 /* Add an External info for AS-external-LSA. */
 110 struct external_info *
 111 ospf_external_info_add(struct ospf *ospf, uint8_t type, unsigned short instance,
 112                        struct prefix_ipv4 p, ifindex_t ifindex,
 113                        struct in_addr nexthop, route_tag_t tag)
 114 {
 115         struct external_info *new;
 116         struct route_node *rn;
 117         struct ospf_external *ext;
 118         char inetbuf[INET6_BUFSIZ];
 119
 120         ext = ospf_external_lookup(ospf, type, instance);
 121         if (!ext)
 122                 ext = ospf_external_add(ospf, type, instance);
 123
 124         rn = route_node_get(EXTERNAL_INFO(ext), (struct prefix *)&p);
 125         /* If old info exists, -- discard new one or overwrite with new one? */
 126         if (rn)
 127                 if (rn->info) {
 128                         new = rn->info;
 129                         if ((new->ifindex == ifindex)
 130                             && (new->nexthop.s_addr == nexthop.s_addr)
 131                             && (new->tag == tag)) {
 132                                 route_unlock_node(rn);
 133                                 return NULL; /* NULL => no LSA to refresh */
 134                         }
 135
 136                         inet_ntop(AF_INET, (void *)&nexthop.s_addr, inetbuf,
 137                                   INET6_BUFSIZ);
 138                         if (IS_DEBUG_OSPF(lsa, LSA_GENERATE))
 139                                 zlog_debug(
 140                                         "Redistribute[%s][%d][%u]: %s/%d discarding old info with NH %s.",
 141                                         ospf_redist_string(type), instance,
 142                                         ospf->vrf_id, inet_ntoa(p.prefix),
 143                                         p.prefixlen, inetbuf);
 144                         XFREE(MTYPE_OSPF_EXTERNAL_INFO, rn->info);
 145                         rn->info = NULL;
 146                 }
 147
 148         /* Create new External info instance. */
 149         new = ospf_external_info_new(type, instance);
 150         new->p = p;
 151         new->ifindex = ifindex;
 152         new->nexthop = nexthop;
 153         new->tag = tag;
 154
 155         /* we don't unlock rn from the get() because we're attaching the info */
 156         if (rn)
 157                 rn->info = new;
 158
 159         if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) {
 160                 inet_ntop(AF_INET, (void *)&nexthop.s_addr, inetbuf,
 161                           INET6_BUFSIZ);
 162                 zlog_debug(
 163                         "Redistribute[%s][%u]: %s/%d external info created, with NH %s",
 164                         ospf_redist_string(type), ospf->vrf_id,
 165                         inet_ntoa(p.prefix), p.prefixlen, inetbuf);
 166         }
 167         return new;
 168 }
 169
 170 void ospf_external_info_delete(struct ospf *ospf, uint8_t type,
 171                                unsigned short instance, struct prefix_ipv4 p)
 172 {
 173         struct route_node *rn;
 174         struct ospf_external *ext;
 175
 176         ext = ospf_external_lookup(ospf, type, instance);
 177         if (!ext)
 178                 return;
 179
 180         rn = route_node_lookup(EXTERNAL_INFO(ext), (struct prefix *)&p);
 181         if (rn) {
 182                 ospf_external_info_free(rn->info);
 183                 rn->info = NULL;
 184                 route_unlock_node(rn);
 185                 route_unlock_node(rn);
 186         }
 187 }
 188
 189 struct external_info *ospf_external_info_lookup(struct ospf *ospf, uint8_t type,
 190                                                 unsigned short instance,
 191                                                 struct prefix_ipv4 *p)
 192 {
 193         struct route_node *rn;
 194         struct ospf_external *ext;
 195
 196         ext = ospf_external_lookup(ospf, type, instance);
 197         if (!ext)
 198                 return NULL;
 199
 200         rn = route_node_lookup(EXTERNAL_INFO(ext), (struct prefix *)p);
 201         if (rn) {
 202                 route_unlock_node(rn);
 203                 if (rn->info)
 204                         return rn->info;
 205         }
 206
 207         return NULL;
 208 }
 209
 210 struct ospf_lsa *ospf_external_info_find_lsa(struct ospf *ospf,
 211                                              struct prefix_ipv4 *p)
 212 {
 213         struct ospf_lsa *lsa;
 214         struct as_external_lsa *al;
 215         struct in_addr mask, id;
 216
 217         lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
 218                                      p->prefix, ospf->router_id);
 219
 220         if (!lsa)
 221                 return NULL;
 222
 223         al = (struct as_external_lsa *)lsa->data;
 224
 225         masklen2ip(p->prefixlen, &mask);
 226
 227         if (mask.s_addr != al->mask.s_addr) {
 228                 id.s_addr = p->prefix.s_addr | (~mask.s_addr);
 229                 lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
 230                                              id, ospf->router_id);
 231                 if (!lsa)
 232                         return NULL;
 233         }
 234
 235         return lsa;
 236 }
 237
 238
 239 /* Update ASBR status. */
 240 void ospf_asbr_status_update(struct ospf *ospf, uint8_t status)
 241 {
 242         zlog_info("ASBR[Status:%d]: Update", status);
 243
 244         /* ASBR on. */
 245         if (status) {
 246                 /* Already ASBR. */
 247                 if (IS_OSPF_ASBR(ospf)) {
 248                         zlog_info("ASBR[Status:%d]: Already ASBR", status);
 249                         return;
 250                 }
 251                 SET_FLAG(ospf->flags, OSPF_FLAG_ASBR);
 252         } else {
 253                 /* Already non ASBR. */
 254                 if (!IS_OSPF_ASBR(ospf)) {
 255                         zlog_info("ASBR[Status:%d]: Already non ASBR", status);
 256                         return;
 257                 }
 258                 UNSET_FLAG(ospf->flags, OSPF_FLAG_ASBR);
 259         }
 260
 261         /* Transition from/to status ASBR, schedule timer. */
 262         ospf_spf_calculate_schedule(ospf, SPF_FLAG_ASBR_STATUS_CHANGE);
 263         ospf_router_lsa_update(ospf);
 264 }
 265
 266 void ospf_redistribute_withdraw(struct ospf *ospf, uint8_t type,
 267                                 unsigned short instance)
 268 {
 269         struct route_node *rn;
 270         struct external_info *ei;
 271         struct ospf_external *ext;
 272
 273         ext = ospf_external_lookup(ospf, type, instance);
 274         if (!ext)
 275                 return;
 276
 277         /* Delete external info for specified type. */
 278         if (EXTERNAL_INFO(ext))
 279                 for (rn = route_top(EXTERNAL_INFO(ext)); rn;
 280                      rn = route_next(rn))
 281                         if ((ei = rn->info))
 282                                 if (ospf_external_info_find_lsa(ospf, &ei->p)) {
 283                                         if (is_prefix_default(&ei->p)
 284                                             && ospf->default_originate
 285                                                        != DEFAULT_ORIGINATE_NONE)
 286                                                 continue;
 287                                         ospf_external_lsa_flush(
 288                                                 ospf, type, &ei->p,
 289                                                 ei->ifindex /*, ei->nexthop */);
 290
 291                                         ospf_external_info_free(ei);
 292                                         route_unlock_node(rn);
 293                                         rn->info = NULL;
 294                                 }
 295 }