ospfd/ospf_route.h

   1 /*
   2  * OSPF routing table.
   3  * Copyright (C) 1999, 2000 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 #ifndef _ZEBRA_OSPF_ROUTE_H
  24 #define _ZEBRA_OSPF_ROUTE_H
  25
  26 #define OSPF_DESTINATION_ROUTER         1
  27 #define OSPF_DESTINATION_NETWORK        2
  28 #define OSPF_DESTINATION_DISCARD        3
  29
  30 #define OSPF_PATH_MIN                   0
  31 #define OSPF_PATH_INTRA_AREA            1
  32 #define OSPF_PATH_INTER_AREA            2
  33 #define OSPF_PATH_TYPE1_EXTERNAL        3
  34 #define OSPF_PATH_TYPE2_EXTERNAL        4
  35 #define OSPF_PATH_MAX                   5
  36
  37 /* OSPF Path. */
  38 struct ospf_path
  39 {
  40   struct in_addr nexthop;
  41   struct in_addr adv_router;
  42   struct ospf_interface *oi;
  43 };
  44
  45 /* Below is the structure linked to every
  46    route node. Note that for Network routing
  47    entries a single ospf_route is kept, while
  48    for ABRs and ASBRs (Router routing entries),
  49    we link an instance of ospf_router_route
  50    where a list of paths is maintained, so
  51
  52    nr->info is a (struct ospf_route *) for OSPF_DESTINATION_NETWORK
  53    but
  54    nr->info is a (struct ospf_router_route *) for OSPF_DESTINATION_ROUTER
  55 */
  56
  57 struct route_standard
  58 {
  59   /* Link Sate Origin. */
  60   struct lsa_header *origin;
  61
  62   /* Associated Area. */
  63   struct in_addr area_id;       /* The area the route belongs to */
  64
  65   /*  Area Type */
  66   int external_routing;
  67
  68   /* Optional Capability. */
  69   u_char options;               /* Get from LSA header. */
  70
  71   /*  */
  72   u_char flags;                 /* From router-LSA */
  73 };
  74
  75 struct route_external
  76 {
  77   /* Link State Origin. */
  78   struct ospf_lsa *origin;
  79
  80   /* Link State Cost Type2. */
  81   u_int32_t type2_cost;
  82
  83   /* Tag value. */
  84   u_int32_t tag;
  85
  86   /* ASBR route. */
  87   struct ospf_route *asbr;
  88 };
  89
  90 struct ospf_route
  91 {
  92   /* Create time. */
  93   time_t ctime;
  94
  95   /* Modified time. */
  96   time_t mtime;
  97
  98   /* Destination Type. */
  99   u_char type;
 100
 101   /* Destination ID. */         /* i.e. Link State ID. */
 102   struct in_addr id;
 103
 104   /* Address Mask. */
 105   struct in_addr mask;          /* Only valid for networks. */
 106
 107   /* Path Type. */
 108   u_char path_type;
 109
 110   /* List of Paths. */
 111   struct list *paths;
 112
 113   /* Link State Cost. */
 114   u_int32_t cost;               /* i.e. metric. */
 115
 116   /* Route specific info. */
 117   union
 118   {
 119     struct route_standard std;
 120     struct route_external ext;
 121   } u;
 122 };
 123
 124 extern struct ospf_path *ospf_path_new (void);
 125 extern void ospf_path_free (struct ospf_path *);
 126 extern struct ospf_path *ospf_path_lookup (struct list *, struct ospf_path *);
 127 extern struct ospf_route *ospf_route_new (void);
 128 extern void ospf_route_free (struct ospf_route *);
 129 extern void ospf_route_delete (struct route_table *);
 130 extern void ospf_route_table_free (struct route_table *);
 131
 132 extern void ospf_route_install (struct ospf *, struct route_table *);
 133 extern void ospf_route_table_dump (struct route_table *);
 134
 135 extern void ospf_intra_add_router (struct route_table *, struct vertex *,
 136                                    struct ospf_area *);
 137
 138 extern void ospf_intra_add_transit (struct route_table *, struct vertex *,
 139                                     struct ospf_area *);
 140
 141 extern void ospf_intra_add_stub (struct route_table *,
 142                                  struct router_lsa_link *, struct vertex *,
 143                                  struct ospf_area *);
 144
 145 extern int ospf_route_cmp (struct ospf *, struct ospf_route *,
 146                            struct ospf_route *);
 147 extern void ospf_route_copy_nexthops (struct ospf_route *, struct list *);
 148 extern void ospf_route_copy_nexthops_from_vertex (struct ospf_route *,
 149                                                   struct vertex *);
 150
 151 extern void ospf_route_subst (struct route_node *, struct ospf_route *,
 152                               struct ospf_route *);
 153 extern void ospf_route_add (struct route_table *, struct prefix_ipv4 *,
 154                             struct ospf_route *, struct ospf_route *);
 155
 156 extern void ospf_route_subst_nexthops (struct ospf_route *, struct list *);
 157 extern void ospf_prune_unreachable_networks (struct route_table *);
 158 extern void ospf_prune_unreachable_routers (struct route_table *);
 159 extern int ospf_add_discard_route (struct route_table *, struct ospf_area *,
 160                                    struct prefix_ipv4 *);
 161 extern void ospf_delete_discard_route (struct prefix_ipv4 *);
 162 extern int ospf_route_match_same (struct route_table *, struct prefix_ipv4 *,
 163                                   struct ospf_route *);
 164
 165 #endif /* _ZEBRA_OSPF_ROUTE_H */