ospfd/ospf_lsa.h

   1 /*
   2  * OSPF Link State Advertisement
   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 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 #ifndef _ZEBRA_OSPF_LSA_H
  23 #define _ZEBRA_OSPF_LSA_H
  24
  25 #include "stream.h"
  26
  27 /* OSPF LSA Default metric values */
  28 #define DEFAULT_DEFAULT_METRIC 20
  29 #define DEFAULT_DEFAULT_ORIGINATE_METRIC 10
  30 #define DEFAULT_DEFAULT_ALWAYS_METRIC 1
  31 #define DEFAULT_METRIC_TYPE EXTERNAL_METRIC_TYPE_2
  32
  33 /* OSPF LSA Range definition. */
  34 #define OSPF_MIN_LSA            1  /* begin range here */
  35 #define OSPF_MAX_LSA           12
  36
  37 /* OSPF LSA Type definition. */
  38 #define OSPF_UNKNOWN_LSA              0
  39 #define OSPF_ROUTER_LSA               1
  40 #define OSPF_NETWORK_LSA              2
  41 #define OSPF_SUMMARY_LSA              3
  42 #define OSPF_ASBR_SUMMARY_LSA         4
  43 #define OSPF_AS_EXTERNAL_LSA          5
  44 #define OSPF_GROUP_MEMBER_LSA         6  /* Not supported. */
  45 #define OSPF_AS_NSSA_LSA                      7
  46 #define OSPF_EXTERNAL_ATTRIBUTES_LSA  8  /* Not supported. */
  47 #define OSPF_OPAQUE_LINK_LSA          9
  48 #define OSPF_OPAQUE_AREA_LSA         10
  49 #define OSPF_OPAQUE_AS_LSA           11
  50
  51 #define OSPF_LSA_HEADER_SIZE         20U
  52 #define OSPF_ROUTER_LSA_LINK_SIZE    12U
  53 #define OSPF_ROUTER_LSA_TOS_SIZE      4U
  54 #define OSPF_MAX_LSA_SIZE          1500U
  55
  56 /* AS-external-LSA refresh method. */
  57 #define LSA_REFRESH_IF_CHANGED  0
  58 #define LSA_REFRESH_FORCE       1
  59
  60 /* OSPF LSA header. */
  61 struct lsa_header {
  62         uint16_t ls_age;
  63         uint8_t options;
  64         uint8_t type;
  65         struct in_addr id;
  66         struct in_addr adv_router;
  67         uint32_t ls_seqnum;
  68         uint16_t checksum;
  69         uint16_t length;
  70 };
  71
  72 struct vertex;
  73
  74 /* OSPF LSA. */
  75 struct ospf_lsa {
  76         /* LSA origination flag. */
  77         uint8_t flags;
  78 #define OSPF_LSA_SELF             0x01
  79 #define OSPF_LSA_SELF_CHECKED     0x02
  80 #define OSPF_LSA_RECEIVED         0x04
  81 #define OSPF_LSA_APPROVED         0x08
  82 #define OSPF_LSA_DISCARD          0x10
  83 #define OSPF_LSA_LOCAL_XLT        0x20
  84 #define OSPF_LSA_PREMATURE_AGE    0x40
  85 #define OSPF_LSA_IN_MAXAGE        0x80
  86
  87         /* LSA data. */
  88         struct lsa_header *data;
  89
  90         /* Received time stamp. */
  91         struct timeval tv_recv;
  92
  93         /* Last time it was originated */
  94         struct timeval tv_orig;
  95
  96         /* All of reference count, also lock to remove. */
  97         int lock;
  98
  99         /* Flags for the SPF calculation. */
 100         struct vertex *stat;
 101
 102         /* References to this LSA in neighbor retransmission lists*/
 103         int retransmit_counter;
 104
 105         /* Area the LSA belongs to, may be NULL if AS-external-LSA. */
 106         struct ospf_area *area;
 107
 108         /* Parent LSDB. */
 109         struct ospf_lsdb *lsdb;
 110
 111         /* Related Route. */
 112         void *route;
 113
 114         /* Refreshement List or Queue */
 115         int refresh_list;
 116
 117         /* For Type-9 Opaque-LSAs */
 118         struct ospf_interface *oi;
 119
 120         /* VRF Id */
 121         vrf_id_t vrf_id;
 122 };
 123
 124 /* OSPF LSA Link Type. */
 125 #define LSA_LINK_TYPE_POINTOPOINT      1
 126 #define LSA_LINK_TYPE_TRANSIT          2
 127 #define LSA_LINK_TYPE_STUB             3
 128 #define LSA_LINK_TYPE_VIRTUALLINK      4
 129
 130 /* OSPF Router LSA Flag. */
 131 #define ROUTER_LSA_BORDER              0x01 /* The router is an ABR */
 132 #define ROUTER_LSA_EXTERNAL            0x02 /* The router is an ASBR */
 133 #define ROUTER_LSA_VIRTUAL             0x04 /* The router has a VL in this area */
 134 #define ROUTER_LSA_NT                  0x10 /* The routers always translates Type-7 */
 135 #define ROUTER_LSA_SHORTCUT            0x20 /* Shortcut-ABR specific flag */
 136
 137 #define IS_ROUTER_LSA_VIRTUAL(x)       ((x)->flags & ROUTER_LSA_VIRTUAL)
 138 #define IS_ROUTER_LSA_EXTERNAL(x)      ((x)->flags & ROUTER_LSA_EXTERNAL)
 139 #define IS_ROUTER_LSA_BORDER(x)        ((x)->flags & ROUTER_LSA_BORDER)
 140 #define IS_ROUTER_LSA_SHORTCUT(x)      ((x)->flags & ROUTER_LSA_SHORTCUT)
 141 #define IS_ROUTER_LSA_NT(x)            ((x)->flags & ROUTER_LSA_NT)
 142
 143 /* OSPF Router-LSA Link information. */
 144 struct router_lsa_link {
 145         struct in_addr link_id;
 146         struct in_addr link_data;
 147         struct {
 148                 uint8_t type;
 149                 uint8_t tos_count;
 150                 uint16_t metric;
 151         } m[1];
 152 };
 153
 154 /* OSPF Router-LSAs structure. */
 155 #define OSPF_ROUTER_LSA_MIN_SIZE                   4U /* w/0 link descriptors */
 156 /* There is an edge case, when number of links in a Router-LSA may be 0 without
 157    breaking the specification. A router, which has no other links to backbone
 158    area besides one virtual link, will not put any VL descriptor blocks into
 159    the Router-LSA generated for area 0 until a full adjacency over the VL is
 160    reached (RFC2328 12.4.1.3). In this case the Router-LSA initially received
 161    by the other end of the VL will have 0 link descriptor blocks, but soon will
 162    be replaced with the next revision having 1 descriptor block. */
 163 struct router_lsa {
 164         struct lsa_header header;
 165         uint8_t flags;
 166         uint8_t zero;
 167         uint16_t links;
 168         struct {
 169                 struct in_addr link_id;
 170                 struct in_addr link_data;
 171                 uint8_t type;
 172                 uint8_t tos;
 173                 uint16_t metric;
 174         } link[1];
 175 };
 176
 177 /* OSPF Network-LSAs structure. */
 178 #define OSPF_NETWORK_LSA_MIN_SIZE                  8U /* w/1 router-ID */
 179 struct network_lsa {
 180         struct lsa_header header;
 181         struct in_addr mask;
 182         struct in_addr routers[1];
 183 };
 184
 185 /* OSPF Summary-LSAs structure. */
 186 #define OSPF_SUMMARY_LSA_MIN_SIZE                  8U /* w/1 TOS metric block */
 187 struct summary_lsa {
 188         struct lsa_header header;
 189         struct in_addr mask;
 190         uint8_t tos;
 191         uint8_t metric[3];
 192 };
 193
 194 /* OSPF AS-external-LSAs structure. */
 195 #define OSPF_AS_EXTERNAL_LSA_MIN_SIZE             16U /* w/1 TOS forwarding block */
 196 struct as_external_lsa {
 197         struct lsa_header header;
 198         struct in_addr mask;
 199         struct {
 200                 uint8_t tos;
 201                 uint8_t metric[3];
 202                 struct in_addr fwd_addr;
 203                 uint32_t route_tag;
 204         } e[1];
 205 };
 206
 207 #include "ospfd/ospf_opaque.h"
 208
 209 /* Macros. */
 210 #define GET_METRIC(x) get_metric(x)
 211 #define IS_EXTERNAL_METRIC(x)   ((x) & 0x80)
 212
 213 #define GET_AGE(x)     (ntohs ((x)->data->ls_age) + time (NULL) - (x)->tv_recv)
 214 #define LS_AGE(x) (OSPF_LSA_MAXAGE < get_age(x) ? OSPF_LSA_MAXAGE : get_age(x))
 215 #define IS_LSA_SELF(L)          (CHECK_FLAG ((L)->flags, OSPF_LSA_SELF))
 216 #define IS_LSA_MAXAGE(L)        (LS_AGE ((L)) == OSPF_LSA_MAXAGE)
 217
 218 #define OSPF_LSA_UPDATE_DELAY           2
 219
 220 #define OSPF_LSA_UPDATE_TIMER_ON(T, F)                                         \
 221         if (!(T))                                                              \
 222         (T) = thread_add_timer(master, (F), 0, 2)
 223
 224 /* Prototypes. */
 225 /* XXX: Eek, time functions, similar are in lib/thread.c */
 226 extern struct timeval int2tv(int);
 227 extern struct timeval msec2tv(int);
 228
 229 extern int get_age(struct ospf_lsa *);
 230 extern uint16_t ospf_lsa_checksum(struct lsa_header *);
 231 extern int ospf_lsa_checksum_valid(struct lsa_header *);
 232 extern int ospf_lsa_refresh_delay(struct ospf_lsa *);
 233
 234 extern const char *dump_lsa_key(struct ospf_lsa *);
 235 extern uint32_t lsa_seqnum_increment(struct ospf_lsa *);
 236 extern void lsa_header_set(struct stream *, uint8_t, uint8_t, struct in_addr,
 237                            struct in_addr);
 238 extern struct ospf_neighbor *ospf_nbr_lookup_ptop(struct ospf_interface *);
 239 extern int ospf_check_nbr_status(struct ospf *);
 240
 241 /* Prototype for LSA primitive. */
 242 extern struct ospf_lsa *ospf_lsa_new(void);
 243 extern struct ospf_lsa *ospf_lsa_new_and_data(size_t size);
 244 extern struct ospf_lsa *ospf_lsa_dup(struct ospf_lsa *);
 245 extern void ospf_lsa_free(struct ospf_lsa *);
 246 extern struct ospf_lsa *ospf_lsa_lock(struct ospf_lsa *);
 247 extern void ospf_lsa_unlock(struct ospf_lsa **);
 248 extern void ospf_lsa_discard(struct ospf_lsa *);
 249 extern int ospf_lsa_flush_schedule(struct ospf *, struct ospf_lsa *);
 250 extern struct lsa_header *ospf_lsa_data_new(size_t);
 251 extern struct lsa_header *ospf_lsa_data_dup(struct lsa_header *);
 252 extern void ospf_lsa_data_free(struct lsa_header *);
 253
 254 /* Prototype for various LSAs */
 255 extern int ospf_router_lsa_update(struct ospf *);
 256 extern int ospf_router_lsa_update_area(struct ospf_area *);
 257
 258 extern void ospf_network_lsa_update(struct ospf_interface *);
 259
 260 extern struct ospf_lsa *
 261 ospf_summary_lsa_originate(struct prefix_ipv4 *, uint32_t, struct ospf_area *);
 262 extern struct ospf_lsa *ospf_summary_asbr_lsa_originate(struct prefix_ipv4 *,
 263                                                         uint32_t,
 264                                                         struct ospf_area *);
 265
 266 extern struct ospf_lsa *ospf_lsa_install(struct ospf *, struct ospf_interface *,
 267                                          struct ospf_lsa *);
 268
 269 extern void ospf_nssa_lsa_flush(struct ospf *ospf, struct prefix_ipv4 *p);
 270 extern void ospf_external_lsa_flush(struct ospf *, uint8_t,
 271                                     struct prefix_ipv4 *,
 272                                     ifindex_t /* , struct in_addr nexthop */);
 273
 274 extern struct in_addr ospf_get_ip_from_ifp(struct ospf_interface *);
 275
 276 extern struct ospf_lsa *ospf_external_lsa_originate(struct ospf *,
 277                                                     struct external_info *);
 278 extern void ospf_external_lsa_rid_change(struct ospf *ospf);
 279 extern struct ospf_lsa *ospf_lsa_lookup(struct ospf *ospf, struct ospf_area *,
 280                                         uint32_t, struct in_addr,
 281                                         struct in_addr);
 282 extern struct ospf_lsa *ospf_lsa_lookup_by_id(struct ospf_area *, uint32_t,
 283                                               struct in_addr);
 284 extern struct ospf_lsa *ospf_lsa_lookup_by_header(struct ospf_area *,
 285                                                   struct lsa_header *);
 286 extern int ospf_lsa_more_recent(struct ospf_lsa *, struct ospf_lsa *);
 287 extern int ospf_lsa_different(struct ospf_lsa *, struct ospf_lsa *);
 288 extern void ospf_flush_self_originated_lsas_now(struct ospf *);
 289
 290 extern int ospf_lsa_is_self_originated(struct ospf *, struct ospf_lsa *);
 291
 292 extern struct ospf_lsa *ospf_lsa_lookup_by_prefix(struct ospf_lsdb *, uint8_t,
 293                                                   struct prefix_ipv4 *,
 294                                                   struct in_addr);
 295
 296 extern void ospf_lsa_maxage(struct ospf *, struct ospf_lsa *);
 297 extern uint32_t get_metric(uint8_t *);
 298
 299 extern int ospf_lsa_maxage_walker(struct thread *);
 300 extern struct ospf_lsa *ospf_lsa_refresh(struct ospf *, struct ospf_lsa *);
 301
 302 extern void ospf_external_lsa_refresh_default(struct ospf *);
 303
 304 extern void ospf_external_lsa_refresh_type(struct ospf *, uint8_t,
 305                                            unsigned short, int);
 306 extern struct ospf_lsa *ospf_external_lsa_refresh(struct ospf *,
 307                                                   struct ospf_lsa *,
 308                                                   struct external_info *, int);
 309 extern struct in_addr ospf_lsa_unique_id(struct ospf *, struct ospf_lsdb *,
 310                                          uint8_t, struct prefix_ipv4 *);
 311 extern void ospf_schedule_lsa_flood_area(struct ospf_area *, struct ospf_lsa *);
 312 extern void ospf_schedule_lsa_flush_area(struct ospf_area *, struct ospf_lsa *);
 313
 314 extern void ospf_refresher_register_lsa(struct ospf *, struct ospf_lsa *);
 315 extern void ospf_refresher_unregister_lsa(struct ospf *, struct ospf_lsa *);
 316 extern int ospf_lsa_refresh_walker(struct thread *);
 317
 318 extern void ospf_lsa_maxage_delete(struct ospf *, struct ospf_lsa *);
 319
 320 extern void ospf_discard_from_db(struct ospf *, struct ospf_lsdb *,
 321                                  struct ospf_lsa *);
 322 extern int is_prefix_default(struct prefix_ipv4 *);
 323
 324 extern int metric_type(struct ospf *, uint8_t, unsigned short);
 325 extern int metric_value(struct ospf *, uint8_t, unsigned short);
 326
 327 extern struct in_addr ospf_get_nssa_ip(struct ospf_area *);
 328 extern int ospf_translated_nssa_compare(struct ospf_lsa *, struct ospf_lsa *);
 329 extern struct ospf_lsa *ospf_translated_nssa_refresh(struct ospf *,
 330                                                      struct ospf_lsa *,
 331                                                      struct ospf_lsa *);
 332 extern struct ospf_lsa *ospf_translated_nssa_originate(struct ospf *,
 333                                                        struct ospf_lsa *);
 334
 335 #endif /* _ZEBRA_OSPF_LSA_H */