zebra/rib.h

   1 /*
   2  * Routing Information Base header
   3  * Copyright (C) 1997 Kunihiro Ishiguro
   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_RIB_H
  23 #define _ZEBRA_RIB_H
  24
  25 #include "zebra.h"
  26 #include "hook.h"
  27 #include "linklist.h"
  28 #include "prefix.h"
  29 #include "table.h"
  30 #include "queue.h"
  31 #include "nexthop.h"
  32 #include "vrf.h"
  33 #include "if.h"
  34 #include "mpls.h"
  35 #include "srcdest_table.h"
  36
  37 #define DISTANCE_INFINITY  255
  38 #define ZEBRA_KERNEL_TABLE_MAX 252 /* support for no more than this rt tables */
  39
  40 struct route_entry {
  41         /* Link list. */
  42         struct route_entry *next;
  43         struct route_entry *prev;
  44
  45         /* Nexthop structure */
  46         struct nexthop *nexthop;
  47
  48         /* Refrence count. */
  49         unsigned long refcnt;
  50
  51         /* Tag */
  52         route_tag_t tag;
  53
  54         /* Uptime. */
  55         time_t uptime;
  56
  57         /* Type fo this route. */
  58         int type;
  59
  60         /* Source protocol instance */
  61         u_short instance;
  62
  63         /* VRF identifier. */
  64         vrf_id_t vrf_id;
  65
  66         /* Which routing table */
  67         uint32_t table;
  68
  69         /* Metric */
  70         u_int32_t metric;
  71
  72         /* MTU */
  73         u_int32_t mtu;
  74         u_int32_t nexthop_mtu;
  75
  76         /* Distance. */
  77         u_char distance;
  78
  79         /* Flags of this route.
  80          * This flag's definition is in lib/zebra.h ZEBRA_FLAG_* and is exposed
  81          * to clients via Zserv
  82          */
  83         u_int32_t flags;
  84
  85         /* RIB internal status */
  86         u_char status;
  87 #define ROUTE_ENTRY_REMOVED          0x1
  88 /* to simplify NHT logic when NHs change, instead of doing a NH by NH cmp */
  89 #define ROUTE_ENTRY_NEXTHOPS_CHANGED 0x2
  90 #define ROUTE_ENTRY_CHANGED          0x4
  91 #define ROUTE_ENTRY_SELECTED_FIB     0x8
  92 #define ROUTE_ENTRY_LABELS_CHANGED   0x10
  93
  94         /* Nexthop information. */
  95         u_char nexthop_num;
  96         u_char nexthop_active_num;
  97 };
  98
  99 /* meta-queue structure:
 100  * sub-queue 0: connected, kernel
 101  * sub-queue 1: static
 102  * sub-queue 2: RIP, RIPng, OSPF, OSPF6, IS-IS, EIGRP, NHRP
 103  * sub-queue 3: iBGP, eBGP
 104  * sub-queue 4: any other origin (if any)
 105  */
 106 #define MQ_SIZE 5
 107 struct meta_queue {
 108         struct list *subq[MQ_SIZE];
 109         u_int32_t size; /* sum of lengths of all subqueues */
 110 };
 111
 112 /*
 113  * Structure that represents a single destination (prefix).
 114  */
 115 typedef struct rib_dest_t_ {
 116
 117         /*
 118          * Back pointer to the route node for this destination. This helps
 119          * us get to the prefix that this structure is for.
 120          */
 121         struct route_node *rnode;
 122
 123         /*
 124          * Doubly-linked list of routes for this prefix.
 125          */
 126         struct route_entry *routes;
 127
 128         /*
 129          * Flags, see below.
 130          */
 131         u_int32_t flags;
 132
 133         /*
 134          * Linkage to put dest on the FPM processing queue.
 135          */
 136         TAILQ_ENTRY(rib_dest_t_) fpm_q_entries;
 137
 138 } rib_dest_t;
 139
 140 #define RIB_ROUTE_QUEUED(x)     (1 << (x))
 141
 142 /*
 143  * The maximum qindex that can be used.
 144  */
 145 #define ZEBRA_MAX_QINDEX        (MQ_SIZE - 1)
 146
 147 /*
 148  * This flag indicates that a given prefix has been 'advertised' to
 149  * the FPM to be installed in the forwarding plane.
 150  */
 151 #define RIB_DEST_SENT_TO_FPM   (1 << (ZEBRA_MAX_QINDEX + 1))
 152
 153 /*
 154  * This flag is set when we need to send an update to the FPM about a
 155  * dest.
 156  */
 157 #define RIB_DEST_UPDATE_FPM    (1 << (ZEBRA_MAX_QINDEX + 2))
 158
 159 /*
 160  * Macro to iterate over each route for a destination (prefix).
 161  */
 162 #define RE_DEST_FOREACH_ROUTE(dest, re)                                        \
 163         for ((re) = (dest) ? (dest)->routes : NULL; (re); (re) = (re)->next)
 164
 165 /*
 166  * Same as above, but allows the current node to be unlinked.
 167  */
 168 #define RE_DEST_FOREACH_ROUTE_SAFE(dest, re, next)                             \
 169         for ((re) = (dest) ? (dest)->routes : NULL;                            \
 170              (re) && ((next) = (re)->next, 1); (re) = (next))
 171
 172 #define RNODE_FOREACH_RE(rn, re)                                               \
 173         RE_DEST_FOREACH_ROUTE(rib_dest_from_rnode(rn), re)
 174
 175 #define RNODE_FOREACH_RE_SAFE(rn, re, next)                                    \
 176         RE_DEST_FOREACH_ROUTE_SAFE(rib_dest_from_rnode(rn), re, next)
 177
 178 #if defined(HAVE_RTADV)
 179 /* Structure which hold status of router advertisement. */
 180 struct rtadv {
 181         int sock;
 182
 183         int adv_if_count;
 184         int adv_msec_if_count;
 185
 186         struct thread *ra_read;
 187         struct thread *ra_timer;
 188 };
 189 #endif /* HAVE_RTADV */
 190
 191 /*
 192  * rib_table_info_t
 193  *
 194  * Structure that is hung off of a route_table that holds information about
 195  * the table.
 196  */
 197 typedef struct rib_table_info_t_ {
 198
 199         /*
 200          * Back pointer to zebra_vrf.
 201          */
 202         struct zebra_vrf *zvrf;
 203         afi_t afi;
 204         safi_t safi;
 205
 206 } rib_table_info_t;
 207
 208 typedef enum {
 209         RIB_TABLES_ITER_S_INIT,
 210         RIB_TABLES_ITER_S_ITERATING,
 211         RIB_TABLES_ITER_S_DONE
 212 } rib_tables_iter_state_t;
 213
 214 /*
 215  * Structure that holds state for iterating over all tables in the
 216  * Routing Information Base.
 217  */
 218 typedef struct rib_tables_iter_t_ {
 219         vrf_id_t vrf_id;
 220         int afi_safi_ix;
 221
 222         rib_tables_iter_state_t state;
 223 } rib_tables_iter_t;
 224
 225 /* Events/reasons triggering a RIB update. */
 226 typedef enum {
 227         RIB_UPDATE_IF_CHANGE,
 228         RIB_UPDATE_RMAP_CHANGE,
 229         RIB_UPDATE_OTHER
 230 } rib_update_event_t;
 231
 232 extern struct nexthop *route_entry_nexthop_ifindex_add(struct route_entry *,
 233                                                        ifindex_t);
 234 extern struct nexthop *route_entry_nexthop_blackhole_add(struct route_entry *,
 235                                                          enum blackhole_type);
 236 extern struct nexthop *route_entry_nexthop_ipv4_add(struct route_entry *,
 237                                                     struct in_addr *,
 238                                                     struct in_addr *);
 239 extern struct nexthop *
 240 route_entry_nexthop_ipv4_ifindex_add(struct route_entry *, struct in_addr *,
 241                                      struct in_addr *, ifindex_t);
 242 extern void route_entry_nexthop_delete(struct route_entry *re,
 243                                        struct nexthop *nexthop);
 244 extern struct nexthop *route_entry_nexthop_ipv6_add(struct route_entry *,
 245                                                     struct in6_addr *);
 246 extern struct nexthop *
 247 route_entry_nexthop_ipv6_ifindex_add(struct route_entry *re,
 248                                      struct in6_addr *ipv6, ifindex_t ifindex);
 249 extern void route_entry_nexthop_add(struct route_entry *re,
 250                                     struct nexthop *nexthop);
 251 extern void route_entry_copy_nexthops(struct route_entry *re,
 252                                       struct nexthop *nh);
 253
 254 #define route_entry_dump(prefix, src, re) _route_entry_dump(__func__, prefix, src, re)
 255 extern void _route_entry_dump(const char *, union prefixconstptr,
 256                               union prefixconstptr, const struct route_entry *);
 257 /* RPF lookup behaviour */
 258 enum multicast_mode {
 259         MCAST_NO_CONFIG = 0,  /* MIX_MRIB_FIRST, but no show in config write */
 260         MCAST_MRIB_ONLY,      /* MRIB only */
 261         MCAST_URIB_ONLY,      /* URIB only */
 262         MCAST_MIX_MRIB_FIRST, /* MRIB, if nothing at all then URIB */
 263         MCAST_MIX_DISTANCE,   /* MRIB & URIB, lower distance wins */
 264         MCAST_MIX_PFXLEN,     /* MRIB & URIB, longer prefix wins */
 265                               /* on equal value, MRIB wins for last 2 */
 266 };
 267
 268 extern void multicast_mode_ipv4_set(enum multicast_mode mode);
 269 extern enum multicast_mode multicast_mode_ipv4_get(void);
 270
 271 extern void rib_lookup_and_dump(struct prefix_ipv4 *, vrf_id_t);
 272 extern void rib_lookup_and_pushup(struct prefix_ipv4 *, vrf_id_t);
 273
 274 extern int rib_lookup_ipv4_route(struct prefix_ipv4 *, union sockunion *,
 275                                  vrf_id_t);
 276 #define ZEBRA_RIB_LOOKUP_ERROR -1
 277 #define ZEBRA_RIB_FOUND_EXACT 0
 278 #define ZEBRA_RIB_FOUND_NOGATE 1
 279 #define ZEBRA_RIB_FOUND_CONNECTED 2
 280 #define ZEBRA_RIB_NOTFOUND 3
 281
 282 extern int is_zebra_valid_kernel_table(u_int32_t table_id);
 283 extern int is_zebra_main_routing_table(u_int32_t table_id);
 284 extern int zebra_check_addr(struct prefix *p);
 285
 286 extern void rib_addnode(struct route_node *rn, struct route_entry *re,
 287                         int process);
 288 extern void rib_delnode(struct route_node *rn, struct route_entry *re);
 289 extern int rib_install_kernel(struct route_node *rn, struct route_entry *re,
 290                               struct route_entry *old);
 291 extern int rib_uninstall_kernel(struct route_node *rn, struct route_entry *re);
 292
 293 /* NOTE:
 294  * All rib_add function will not just add prefix into RIB, but
 295  * also implicitly withdraw equal prefix of same type. */
 296 extern int rib_add(afi_t afi, safi_t safi, vrf_id_t vrf_id, int type,
 297                    u_short instance, int flags, struct prefix *p,
 298                    struct prefix_ipv6 *src_p, const struct nexthop *nh,
 299                    u_int32_t table_id, u_int32_t metric, u_int32_t mtu,
 300                    u_char distance);
 301
 302 extern int rib_add_multipath(afi_t afi, safi_t safi, struct prefix *,
 303                              struct prefix_ipv6 *src_p, struct route_entry *);
 304
 305 extern void rib_delete(afi_t afi, safi_t safi, vrf_id_t vrf_id, int type,
 306                        u_short instance, int flags, struct prefix *p,
 307                        struct prefix_ipv6 *src_p, const struct nexthop *nh,
 308                        u_int32_t table_id, u_int32_t metric);
 309
 310 extern struct route_entry *rib_match(afi_t afi, safi_t safi, vrf_id_t,
 311                                      union g_addr *,
 312                                      struct route_node **rn_out);
 313 extern struct route_entry *rib_match_ipv4_multicast(vrf_id_t vrf_id,
 314                                                     struct in_addr addr,
 315                                                     struct route_node **rn_out);
 316
 317 extern struct route_entry *rib_lookup_ipv4(struct prefix_ipv4 *, vrf_id_t);
 318
 319 extern void rib_update(vrf_id_t, rib_update_event_t);
 320 extern void rib_weed_tables(void);
 321 extern void rib_sweep_route(void);
 322 extern void rib_close_table(struct route_table *);
 323 extern void rib_init(void);
 324 extern unsigned long rib_score_proto(u_char proto, u_short instance);
 325 extern void rib_queue_add(struct route_node *rn);
 326 extern void meta_queue_free(struct meta_queue *mq);
 327 extern int zebra_rib_labeled_unicast(struct route_entry *re);
 328 extern struct route_table *rib_table_ipv6;
 329
 330 extern void rib_unlink(struct route_node *, struct route_entry *);
 331 extern int rib_gc_dest(struct route_node *rn);
 332 extern struct route_table *rib_tables_iter_next(rib_tables_iter_t *iter);
 333
 334 extern u_char route_distance(int type);
 335
 336 /*
 337  * Inline functions.
 338  */
 339
 340 /*
 341  * rib_table_info
 342  */
 343 static inline rib_table_info_t *rib_table_info(struct route_table *table)
 344 {
 345         return (rib_table_info_t *)table->info;
 346 }
 347
 348 /*
 349  * rib_dest_from_rnode
 350  */
 351 static inline rib_dest_t *rib_dest_from_rnode(struct route_node *rn)
 352 {
 353         return (rib_dest_t *)rn->info;
 354 }
 355
 356 /*
 357  * rnode_to_ribs
 358  *
 359  * Returns a pointer to the list of routes corresponding to the given
 360  * route_node.
 361  */
 362 static inline struct route_entry *rnode_to_ribs(struct route_node *rn)
 363 {
 364         rib_dest_t *dest;
 365
 366         dest = rib_dest_from_rnode(rn);
 367         if (!dest)
 368                 return NULL;
 369
 370         return dest->routes;
 371 }
 372
 373 /*
 374  * rib_dest_prefix
 375  */
 376 static inline struct prefix *rib_dest_prefix(rib_dest_t *dest)
 377 {
 378         return &dest->rnode->p;
 379 }
 380
 381 /*
 382  * rib_dest_af
 383  *
 384  * Returns the address family that the destination is for.
 385  */
 386 static inline u_char rib_dest_af(rib_dest_t *dest)
 387 {
 388         return dest->rnode->p.family;
 389 }
 390
 391 /*
 392  * rib_dest_table
 393  */
 394 static inline struct route_table *rib_dest_table(rib_dest_t *dest)
 395 {
 396         return srcdest_rnode_table(dest->rnode);
 397 }
 398
 399 /*
 400  * rib_dest_vrf
 401  */
 402 static inline struct zebra_vrf *rib_dest_vrf(rib_dest_t *dest)
 403 {
 404         return rib_table_info(rib_dest_table(dest))->zvrf;
 405 }
 406
 407 /*
 408  * rib_tables_iter_init
 409  */
 410 static inline void rib_tables_iter_init(rib_tables_iter_t *iter)
 411
 412 {
 413         memset(iter, 0, sizeof(*iter));
 414         iter->state = RIB_TABLES_ITER_S_INIT;
 415 }
 416
 417 /*
 418  * rib_tables_iter_started
 419  *
 420  * Returns TRUE if this iterator has started iterating over the set of
 421  * tables.
 422  */
 423 static inline int rib_tables_iter_started(rib_tables_iter_t *iter)
 424 {
 425         return iter->state != RIB_TABLES_ITER_S_INIT;
 426 }
 427
 428 /*
 429  * rib_tables_iter_cleanup
 430  */
 431 static inline void rib_tables_iter_cleanup(rib_tables_iter_t *iter)
 432 {
 433         iter->state = RIB_TABLES_ITER_S_DONE;
 434 }
 435
 436 DECLARE_HOOK(rib_update, (struct route_node * rn, const char *reason),
 437              (rn, reason))
 438
 439 #endif /*_ZEBRA_RIB_H */