zebra/rib.h

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Routing Information Base header
   4  * Copyright (C) 1997 Kunihiro Ishiguro
   5  */
   6
   7 #ifndef _ZEBRA_RIB_H
   8 #define _ZEBRA_RIB_H
   9
  10 #include "zebra.h"
  11 #include "memory.h"
  12 #include "hook.h"
  13 #include "typesafe.h"
  14 #include "linklist.h"
  15 #include "prefix.h"
  16 #include "table.h"
  17 #include "queue.h"
  18 #include "nexthop.h"
  19 #include "nexthop_group.h"
  20 #include "vrf.h"
  21 #include "if.h"
  22 #include "mpls.h"
  23 #include "srcdest_table.h"
  24 #include "zebra/zebra_nhg.h"
  25
  26 #ifdef __cplusplus
  27 extern "C" {
  28 #endif
  29
  30 DECLARE_MGROUP(ZEBRA);
  31
  32 DECLARE_MTYPE(RE);
  33
  34 PREDECL_LIST(rnh_list);
  35
  36 /* Nexthop structure. */
  37 struct rnh {
  38         uint8_t flags;
  39
  40 #define ZEBRA_NHT_CONNECTED 0x1
  41 #define ZEBRA_NHT_DELETED 0x2
  42 #define ZEBRA_NHT_RESOLVE_VIA_DEFAULT 0x4
  43
  44         /* VRF identifier. */
  45         vrf_id_t vrf_id;
  46
  47         afi_t afi;
  48         safi_t safi;
  49
  50         uint32_t seqno;
  51
  52         struct route_entry *state;
  53         struct prefix resolved_route;
  54         struct list *client_list;
  55
  56         /* pseudowires dependent on this nh */
  57         struct list *zebra_pseudowire_list;
  58
  59         struct route_node *node;
  60
  61         /*
  62          * if this has been filtered for the client
  63          */
  64         int filtered[ZEBRA_ROUTE_MAX];
  65
  66         struct rnh_list_item rnh_list_item;
  67 };
  68
  69 #define DISTANCE_INFINITY  255
  70 #define ZEBRA_KERNEL_TABLE_MAX 252 /* support for no more than this rt tables */
  71
  72 PREDECL_LIST(re_list);
  73
  74 struct re_opaque {
  75         uint16_t length;
  76         uint8_t data[];
  77 };
  78
  79 struct route_entry {
  80         /* Link list. */
  81         struct re_list_item next;
  82
  83         /* Nexthop group, shared/refcounted, based on the nexthop(s)
  84          * provided by the owner of the route
  85          */
  86         struct nhg_hash_entry *nhe;
  87
  88         /* Nexthop group from FIB (optional), reflecting what is actually
  89          * installed in the FIB if that differs. The 'backup' group is used
  90          * when backup nexthops are present in the route's nhg.
  91          */
  92         struct nexthop_group fib_ng;
  93         struct nexthop_group fib_backup_ng;
  94
  95         /* Nexthop group hash entry IDs. The "installed" id is the id
  96          * used in linux/netlink, if available.
  97          */
  98         uint32_t nhe_id;
  99         uint32_t nhe_installed_id;
 100
 101         /* Tag */
 102         route_tag_t tag;
 103
 104         /* Uptime. */
 105         time_t uptime;
 106
 107         /* Type of this route. */
 108         int type;
 109
 110         /* VRF identifier. */
 111         vrf_id_t vrf_id;
 112
 113         /* Which routing table */
 114         uint32_t table;
 115
 116         /* Metric */
 117         uint32_t metric;
 118
 119         /* MTU */
 120         uint32_t mtu;
 121         uint32_t nexthop_mtu;
 122
 123         /* Flags of this route.
 124          * This flag's definition is in lib/zebra.h ZEBRA_FLAG_* and is exposed
 125          * to clients via Zserv
 126          */
 127         uint32_t flags;
 128
 129         /* RIB internal status */
 130         uint32_t status;
 131 #define ROUTE_ENTRY_REMOVED          0x1
 132 /* The Route Entry has changed */
 133 #define ROUTE_ENTRY_CHANGED          0x2
 134 /* The Label has changed on the Route entry */
 135 #define ROUTE_ENTRY_LABELS_CHANGED   0x4
 136 /* Route is queued for Installation into the Data Plane */
 137 #define ROUTE_ENTRY_QUEUED   0x8
 138 /* Route is installed into the Data Plane */
 139 #define ROUTE_ENTRY_INSTALLED        0x10
 140 /* Route has Failed installation into the Data Plane in some manner */
 141 #define ROUTE_ENTRY_FAILED           0x20
 142 /* Route has a 'fib' set of nexthops, probably because the installed set
 143  * differs from the rib/normal set of nexthops.
 144  */
 145 #define ROUTE_ENTRY_USE_FIB_NHG      0x40
 146 /*
 147  * Route entries that are going to the dplane for a Route Replace
 148  * let's note the fact that this is happening.  This will
 149  * be useful when zebra is determing if a route can be
 150  * used for nexthops
 151  */
 152 #define ROUTE_ENTRY_ROUTE_REPLACING 0x80
 153
 154         /* Sequence value incremented for each dataplane operation */
 155         uint32_t dplane_sequence;
 156
 157         /* Source protocol instance */
 158         uint16_t instance;
 159
 160         /* Distance. */
 161         uint8_t distance;
 162
 163         struct re_opaque *opaque;
 164 };
 165
 166 #define RIB_SYSTEM_ROUTE(R) RSYSTEM_ROUTE((R)->type)
 167
 168 #define RIB_KERNEL_ROUTE(R) RKERNEL_ROUTE((R)->type)
 169
 170 /* meta-queue structure:
 171  * sub-queue 0: nexthop group objects
 172  * sub-queue 1: EVPN/VxLAN objects
 173  * sub-queue 2: Early Route Processing
 174  * sub-queue 3: Early Label Processing
 175  * sub-queue 4: connected
 176  * sub-queue 5: kernel
 177  * sub-queue 6: static
 178  * sub-queue 7: RIP, RIPng, OSPF, OSPF6, IS-IS, EIGRP, NHRP
 179  * sub-queue 8: iBGP, eBGP
 180  * sub-queue 9: any other origin (if any) typically those that
 181  *              don't generate routes
 182  */
 183 #define MQ_SIZE 10
 184 struct meta_queue {
 185         struct list *subq[MQ_SIZE];
 186         uint32_t size; /* sum of lengths of all subqueues */
 187 };
 188
 189 /*
 190  * Structure that represents a single destination (prefix).
 191  */
 192 typedef struct rib_dest_t_ {
 193
 194         /*
 195          * Back pointer to the route node for this destination. This helps
 196          * us get to the prefix that this structure is for.
 197          */
 198         struct route_node *rnode;
 199
 200         /*
 201          * Doubly-linked list of routes for this prefix.
 202          */
 203         struct re_list_head routes;
 204
 205         struct route_entry *selected_fib;
 206
 207         /*
 208          * Flags, see below.
 209          */
 210         uint32_t flags;
 211
 212         /*
 213          * The list of nht prefixes that have ended up
 214          * depending on this route node.
 215          * After route processing is returned from
 216          * the data plane we will run evaluate_rnh
 217          * on these prefixes.
 218          */
 219         struct rnh_list_head nht;
 220
 221         /*
 222          * Linkage to put dest on the FPM processing queue.
 223          */
 224         TAILQ_ENTRY(rib_dest_t_) fpm_q_entries;
 225
 226 } rib_dest_t;
 227
 228 DECLARE_LIST(rnh_list, struct rnh, rnh_list_item);
 229 DECLARE_LIST(re_list, struct route_entry, next);
 230
 231 #define RIB_ROUTE_QUEUED(x)     (1 << (x))
 232 // If MQ_SIZE is modified this value needs to be updated.
 233 #define RIB_ROUTE_ANY_QUEUED 0x3F
 234
 235 /*
 236  * The maximum qindex that can be used.
 237  */
 238 #define ZEBRA_MAX_QINDEX        (MQ_SIZE - 1)
 239
 240 /*
 241  * This flag indicates that a given prefix has been 'advertised' to
 242  * the FPM to be installed in the forwarding plane.
 243  */
 244 #define RIB_DEST_SENT_TO_FPM   (1 << (ZEBRA_MAX_QINDEX + 1))
 245
 246 /*
 247  * This flag is set when we need to send an update to the FPM about a
 248  * dest.
 249  */
 250 #define RIB_DEST_UPDATE_FPM    (1 << (ZEBRA_MAX_QINDEX + 2))
 251
 252 #define RIB_DEST_UPDATE_LSPS   (1 << (ZEBRA_MAX_QINDEX + 3))
 253
 254 /*
 255  * Macro to iterate over each route for a destination (prefix).
 256  */
 257 #define RE_DEST_FOREACH_ROUTE(dest, re)                                        \
 258         for ((re) = (dest) ? re_list_first(&((dest)->routes)) : NULL; (re);    \
 259              (re) = re_list_next(&((dest)->routes), (re)))
 260
 261 /*
 262  * Same as above, but allows the current node to be unlinked.
 263  */
 264 #define RE_DEST_FOREACH_ROUTE_SAFE(dest, re, next)                             \
 265         for ((re) = (dest) ? re_list_first(&((dest)->routes)) : NULL;          \
 266              (re) && ((next) = re_list_next(&((dest)->routes), (re)), 1);      \
 267              (re) = (next))
 268
 269 #define RE_DEST_FIRST_ROUTE(dest, re)                                          \
 270         ((re) = (dest) ? re_list_first(&((dest)->routes)) : NULL)
 271
 272 #define RE_DEST_NEXT_ROUTE(dest, re)                                           \
 273         ((re) = (dest) ? re_list_next(&((dest)->routes), (re)) : NULL)
 274
 275 #define RNODE_FOREACH_RE(rn, re)                                               \
 276         RE_DEST_FOREACH_ROUTE (rib_dest_from_rnode(rn), re)
 277
 278 #define RNODE_FOREACH_RE_SAFE(rn, re, next)                                    \
 279         RE_DEST_FOREACH_ROUTE_SAFE (rib_dest_from_rnode(rn), re, next)
 280
 281 #define RNODE_FIRST_RE(rn, re) RE_DEST_FIRST_ROUTE(rib_dest_from_rnode(rn), re)
 282
 283 #define RNODE_NEXT_RE(rn, re) RE_DEST_NEXT_ROUTE(rib_dest_from_rnode(rn), re)
 284
 285 /*
 286  * rib_table_info_t
 287  *
 288  * Structure that is hung off of a route_table that holds information about
 289  * the table.
 290  */
 291 struct rib_table_info {
 292
 293         /*
 294          * Back pointer to zebra_vrf.
 295          */
 296         struct zebra_vrf *zvrf;
 297         afi_t afi;
 298         safi_t safi;
 299         uint32_t table_id;
 300 };
 301
 302 enum rib_tables_iter_state {
 303         RIB_TABLES_ITER_S_INIT,
 304         RIB_TABLES_ITER_S_ITERATING,
 305         RIB_TABLES_ITER_S_DONE
 306 };
 307
 308 /*
 309  * Structure that holds state for iterating over all tables in the
 310  * Routing Information Base.
 311  */
 312 typedef struct rib_tables_iter_t_ {
 313         vrf_id_t vrf_id;
 314         int afi_safi_ix;
 315
 316         enum rib_tables_iter_state state;
 317 } rib_tables_iter_t;
 318
 319 /* Events/reasons triggering a RIB update. */
 320 enum rib_update_event {
 321         RIB_UPDATE_KERNEL,
 322         RIB_UPDATE_RMAP_CHANGE,
 323         RIB_UPDATE_OTHER,
 324         RIB_UPDATE_MAX
 325 };
 326
 327 int route_entry_update_nhe(struct route_entry *re,
 328                            struct nhg_hash_entry *new_nhghe);
 329
 330 /* NHG replace has happend, we have to update route_entry pointers to new one */
 331 void rib_handle_nhg_replace(struct nhg_hash_entry *old_entry,
 332                             struct nhg_hash_entry *new_entry);
 333
 334 #define route_entry_dump(prefix, src, re) _route_entry_dump(__func__, prefix, src, re)
 335 extern void _route_entry_dump(const char *func, union prefixconstptr pp,
 336                               union prefixconstptr src_pp,
 337                               const struct route_entry *re);
 338
 339 struct route_entry *
 340 zebra_rib_route_entry_new(vrf_id_t vrf_id, int type, uint8_t instance,
 341                           uint32_t flags, uint32_t nhe_id, uint32_t table_id,
 342                           uint32_t metric, uint32_t mtu, uint8_t distance,
 343                           route_tag_t tag);
 344
 345 #define ZEBRA_RIB_LOOKUP_ERROR -1
 346 #define ZEBRA_RIB_FOUND_EXACT 0
 347 #define ZEBRA_RIB_FOUND_NOGATE 1
 348 #define ZEBRA_RIB_FOUND_CONNECTED 2
 349 #define ZEBRA_RIB_NOTFOUND 3
 350
 351 extern int is_zebra_valid_kernel_table(uint32_t table_id);
 352 extern int is_zebra_main_routing_table(uint32_t table_id);
 353 extern int zebra_check_addr(const struct prefix *p);
 354
 355 extern void rib_delnode(struct route_node *rn, struct route_entry *re);
 356 extern void rib_install_kernel(struct route_node *rn, struct route_entry *re,
 357                                struct route_entry *old);
 358 extern void rib_uninstall_kernel(struct route_node *rn, struct route_entry *re);
 359
 360 /* NOTE:
 361  * All rib_add function will not just add prefix into RIB, but
 362  * also implicitly withdraw equal prefix of same type. */
 363 extern int rib_add(afi_t afi, safi_t safi, vrf_id_t vrf_id, int type,
 364                    unsigned short instance, uint32_t flags, struct prefix *p,
 365                    struct prefix_ipv6 *src_p, const struct nexthop *nh,
 366                    uint32_t nhe_id, uint32_t table_id, uint32_t metric,
 367                    uint32_t mtu, uint8_t distance, route_tag_t tag,
 368                    bool startup);
 369 /*
 370  * Multipath route apis.
 371  */
 372 extern int rib_add_multipath(afi_t afi, safi_t safi, struct prefix *p,
 373                              struct prefix_ipv6 *src_p, struct route_entry *re,
 374                              struct nexthop_group *ng, bool startup);
 375 /*
 376  * -1 -> some sort of error
 377  *  0 -> an add
 378  *  1 -> an update
 379  */
 380 extern int rib_add_multipath_nhe(afi_t afi, safi_t safi, struct prefix *p,
 381                                  struct prefix_ipv6 *src_p,
 382                                  struct route_entry *re,
 383                                  struct nhg_hash_entry *nhe, bool startup);
 384
 385 extern void rib_delete(afi_t afi, safi_t safi, vrf_id_t vrf_id, int type,
 386                        unsigned short instance, uint32_t flags,
 387                        struct prefix *p, struct prefix_ipv6 *src_p,
 388                        const struct nexthop *nh, uint32_t nhe_id,
 389                        uint32_t table_id, uint32_t metric, uint8_t distance,
 390                        bool fromkernel);
 391
 392 extern struct route_entry *rib_match(afi_t afi, safi_t safi, vrf_id_t vrf_id,
 393                                      const union g_addr *addr,
 394                                      struct route_node **rn_out);
 395 extern struct route_entry *rib_match_multicast(afi_t afi, vrf_id_t vrf_id,
 396                                                union g_addr *gaddr,
 397                                                struct route_node **rn_out);
 398
 399 extern struct route_entry *rib_lookup_ipv4(struct prefix_ipv4 *p,
 400                                            vrf_id_t vrf_id);
 401
 402 extern void rib_update(enum rib_update_event event);
 403 extern void rib_update_table(struct route_table *table,
 404                              enum rib_update_event event, int rtype);
 405 extern void rib_sweep_route(struct event *t);
 406 extern void rib_sweep_table(struct route_table *table);
 407 extern void rib_close_table(struct route_table *table);
 408 extern void rib_init(void);
 409 extern unsigned long rib_score_proto(uint8_t proto, unsigned short instance);
 410 extern unsigned long rib_score_proto_table(uint8_t proto,
 411                                            unsigned short instance,
 412                                            struct route_table *table);
 413
 414 extern int rib_queue_add(struct route_node *rn);
 415
 416 struct nhg_ctx; /* Forward declaration */
 417
 418 /* Enqueue incoming nhg from OS for processing */
 419 extern int rib_queue_nhg_ctx_add(struct nhg_ctx *ctx);
 420
 421 /* Enqueue incoming nhg from proto daemon for processing */
 422 extern int rib_queue_nhe_add(struct nhg_hash_entry *nhe);
 423
 424 /* Enqueue evpn route for processing */
 425 int zebra_rib_queue_evpn_route_add(vrf_id_t vrf_id, const struct ethaddr *rmac,
 426                                    const struct ipaddr *vtep_ip,
 427                                    const struct prefix *host_prefix);
 428 int zebra_rib_queue_evpn_route_del(vrf_id_t vrf_id,
 429                                    const struct ipaddr *vtep_ip,
 430                                    const struct prefix *host_prefix);
 431 /* Enqueue EVPN remote ES for processing */
 432 int zebra_rib_queue_evpn_rem_es_add(const esi_t *esi,
 433                                     const struct in_addr *vtep_ip,
 434                                     bool esr_rxed, uint8_t df_alg,
 435                                     uint16_t df_pref);
 436 int zebra_rib_queue_evpn_rem_es_del(const esi_t *esi,
 437                                     const struct in_addr *vtep_ip);
 438 /* Enqueue EVPN remote macip update for processing */
 439 int zebra_rib_queue_evpn_rem_macip_del(vni_t vni, const struct ethaddr *macaddr,
 440                                        const struct ipaddr *ip,
 441                                        struct in_addr vtep_ip);
 442 int zebra_rib_queue_evpn_rem_macip_add(vni_t vni, const struct ethaddr *macaddr,
 443                                        const struct ipaddr *ipaddr,
 444                                        uint8_t flags, uint32_t seq,
 445                                        struct in_addr vtep_ip,
 446                                        const esi_t *esi);
 447 /* Enqueue VXLAN remote vtep update for processing */
 448 int zebra_rib_queue_evpn_rem_vtep_add(vrf_id_t vrf_id, vni_t vni,
 449                                       struct in_addr vtep_ip,
 450                                       int flood_control);
 451 int zebra_rib_queue_evpn_rem_vtep_del(vrf_id_t vrf_id, vni_t vni,
 452                                       struct in_addr vtep_ip);
 453
 454 extern void meta_queue_free(struct meta_queue *mq, struct zebra_vrf *zvrf);
 455 extern int zebra_rib_labeled_unicast(struct route_entry *re);
 456 extern struct route_table *rib_table_ipv6;
 457
 458 extern void rib_unlink(struct route_node *rn, struct route_entry *re);
 459 extern int rib_gc_dest(struct route_node *rn);
 460 extern struct route_table *rib_tables_iter_next(rib_tables_iter_t *iter);
 461
 462 extern uint8_t route_distance(int type);
 463
 464 extern void zebra_rib_evaluate_rn_nexthops(struct route_node *rn, uint32_t seq,
 465                                            bool rt_delete);
 466
 467 extern struct route_node *
 468 rib_find_rn_from_ctx(const struct zebra_dplane_ctx *ctx);
 469
 470 /*
 471  * Inline functions.
 472  */
 473
 474 /*
 475  * rib_table_info
 476  */
 477 static inline struct rib_table_info *rib_table_info(struct route_table *table)
 478 {
 479         return (struct rib_table_info *)route_table_get_info(table);
 480 }
 481
 482 /*
 483  * rib_dest_from_rnode
 484  */
 485 static inline rib_dest_t *rib_dest_from_rnode(struct route_node *rn)
 486 {
 487         return (rib_dest_t *)rn->info;
 488 }
 489
 490 /*
 491  * rnode_to_ribs
 492  *
 493  * Returns a pointer to the list of routes corresponding to the given
 494  * route_node.
 495  */
 496 static inline struct route_entry *rnode_to_ribs(struct route_node *rn)
 497 {
 498         rib_dest_t *dest;
 499
 500         dest = rib_dest_from_rnode(rn);
 501         if (!dest)
 502                 return NULL;
 503
 504         return re_list_first(&dest->routes);
 505 }
 506
 507 /*
 508  * rib_dest_prefix
 509  */
 510 static inline struct prefix *rib_dest_prefix(rib_dest_t *dest)
 511 {
 512         return &dest->rnode->p;
 513 }
 514
 515 /*
 516  * rib_dest_af
 517  *
 518  * Returns the address family that the destination is for.
 519  */
 520 static inline uint8_t rib_dest_af(rib_dest_t *dest)
 521 {
 522         return dest->rnode->p.family;
 523 }
 524
 525 /*
 526  * rib_dest_table
 527  */
 528 static inline struct route_table *rib_dest_table(rib_dest_t *dest)
 529 {
 530         return srcdest_rnode_table(dest->rnode);
 531 }
 532
 533 /*
 534  * rib_dest_vrf
 535  */
 536 static inline struct zebra_vrf *rib_dest_vrf(rib_dest_t *dest)
 537 {
 538         return rib_table_info(rib_dest_table(dest))->zvrf;
 539 }
 540
 541 /*
 542  * Create the rib_dest_t and attach it to the specified node
 543  */
 544 extern rib_dest_t *zebra_rib_create_dest(struct route_node *rn);
 545
 546 /*
 547  * rib_tables_iter_init
 548  */
 549 static inline void rib_tables_iter_init(rib_tables_iter_t *iter)
 550
 551 {
 552         memset(iter, 0, sizeof(*iter));
 553         iter->state = RIB_TABLES_ITER_S_INIT;
 554 }
 555
 556 /*
 557  * rib_tables_iter_started
 558  *
 559  * Returns true if this iterator has started iterating over the set of
 560  * tables.
 561  */
 562 static inline int rib_tables_iter_started(rib_tables_iter_t *iter)
 563 {
 564         return iter->state != RIB_TABLES_ITER_S_INIT;
 565 }
 566
 567 /*
 568  * rib_tables_iter_cleanup
 569  */
 570 static inline void rib_tables_iter_cleanup(rib_tables_iter_t *iter)
 571 {
 572         iter->state = RIB_TABLES_ITER_S_DONE;
 573 }
 574
 575 DECLARE_HOOK(rib_update, (struct route_node * rn, const char *reason),
 576              (rn, reason));
 577 DECLARE_HOOK(rib_shutdown, (struct route_node * rn), (rn));
 578
 579 /*
 580  * Access installed/fib nexthops, which may be a subset of the
 581  * rib nexthops.
 582  */
 583 static inline struct nexthop_group *rib_get_fib_nhg(struct route_entry *re)
 584 {
 585         /* If the fib set is a subset of the active rib set,
 586          * use the dedicated fib list.
 587          */
 588         if (CHECK_FLAG(re->status, ROUTE_ENTRY_USE_FIB_NHG))
 589                 return &(re->fib_ng);
 590         else
 591                 return &(re->nhe->nhg);
 592 }
 593
 594 /*
 595  * Access backup nexthop-group that represents the installed backup nexthops;
 596  * any installed backup will be on the fib list.
 597  */
 598 static inline struct nexthop_group *rib_get_fib_backup_nhg(
 599         struct route_entry *re)
 600 {
 601         return &(re->fib_backup_ng);
 602 }
 603
 604 extern void zebra_vty_init(void);
 605
 606 extern pid_t pid;
 607
 608 extern bool v6_rr_semantics;
 609
 610 /* Name of hook calls */
 611 #define ZEBRA_ON_RIB_PROCESS_HOOK_CALL "on_rib_process_dplane_results"
 612
 613 #ifdef __cplusplus
 614 }
 615 #endif
 616
 617 #endif /*_ZEBRA_RIB_H */