bgpd/bgp_route.h

   1 /* BGP routing information base
   2  * Copyright (C) 1996, 97, 98, 2000 Kunihiro Ishiguro
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef _QUAGGA_BGP_ROUTE_H
  22 #define _QUAGGA_BGP_ROUTE_H
  23
  24 #include <stdbool.h>
  25
  26 #include "hook.h"
  27 #include "queue.h"
  28 #include "nexthop.h"
  29 #include "bgp_table.h"
  30 #include "bgp_addpath_types.h"
  31
  32 struct bgp_nexthop_cache;
  33 struct bgp_route_evpn;
  34
  35 enum bgp_show_type {
  36         bgp_show_type_normal,
  37         bgp_show_type_regexp,
  38         bgp_show_type_prefix_list,
  39         bgp_show_type_filter_list,
  40         bgp_show_type_route_map,
  41         bgp_show_type_neighbor,
  42         bgp_show_type_cidr_only,
  43         bgp_show_type_prefix_longer,
  44         bgp_show_type_community_all,
  45         bgp_show_type_community,
  46         bgp_show_type_community_exact,
  47         bgp_show_type_community_list,
  48         bgp_show_type_community_list_exact,
  49         bgp_show_type_lcommunity_all,
  50         bgp_show_type_lcommunity,
  51         bgp_show_type_lcommunity_exact,
  52         bgp_show_type_lcommunity_list,
  53         bgp_show_type_lcommunity_list_exact,
  54         bgp_show_type_flap_statistics,
  55         bgp_show_type_flap_neighbor,
  56         bgp_show_type_dampend_paths,
  57         bgp_show_type_damp_neighbor,
  58         bgp_show_type_detail,
  59 };
  60
  61 enum bgp_show_adj_route_type {
  62         bgp_show_adj_route_advertised,
  63         bgp_show_adj_route_received,
  64         bgp_show_adj_route_filtered,
  65 };
  66
  67
  68 #define BGP_SHOW_SCODE_HEADER                                                  \
  69         "Status codes:  s suppressed, d damped, "                              \
  70         "h history, * valid, > best, = multipath,\n"                           \
  71         "               i internal, r RIB-failure, S Stale, R Removed\n"
  72 #define BGP_SHOW_OCODE_HEADER "Origin codes:  i - IGP, e - EGP, ? - incomplete\n\n"
  73 #define BGP_SHOW_NCODE_HEADER "Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self\n"
  74 #define BGP_SHOW_HEADER "   Network          Next Hop            Metric LocPrf Weight Path\n"
  75
  76 /* Maximum number of labels we can process or send with a prefix. We
  77  * really do only 1 for MPLS (BGP-LU) but we can do 2 for EVPN-VxLAN.
  78  */
  79 #define BGP_MAX_LABELS 2
  80
  81 /* Error codes for handling NLRI */
  82 #define BGP_NLRI_PARSE_OK 0
  83 #define BGP_NLRI_PARSE_ERROR_PREFIX_OVERFLOW -1
  84 #define BGP_NLRI_PARSE_ERROR_PACKET_OVERFLOW -2
  85 #define BGP_NLRI_PARSE_ERROR_PREFIX_LENGTH -3
  86 #define BGP_NLRI_PARSE_ERROR_PACKET_LENGTH -4
  87 #define BGP_NLRI_PARSE_ERROR_LABEL_LENGTH -5
  88 #define BGP_NLRI_PARSE_ERROR_EVPN_MISSING_TYPE -6
  89 #define BGP_NLRI_PARSE_ERROR_EVPN_TYPE2_SIZE -7
  90 #define BGP_NLRI_PARSE_ERROR_EVPN_TYPE3_SIZE -8
  91 #define BGP_NLRI_PARSE_ERROR_EVPN_TYPE4_SIZE -9
  92 #define BGP_NLRI_PARSE_ERROR_EVPN_TYPE5_SIZE -10
  93 #define BGP_NLRI_PARSE_ERROR_FLOWSPEC_IPV6_NOT_SUPPORTED -11
  94 #define BGP_NLRI_PARSE_ERROR_FLOWSPEC_NLRI_SIZELIMIT -12
  95 #define BGP_NLRI_PARSE_ERROR_FLOWSPEC_BAD_FORMAT -13
  96 #define BGP_NLRI_PARSE_ERROR_ADDRESS_FAMILY -14
  97 #define BGP_NLRI_PARSE_ERROR -32
  98
  99 /* Ancillary information to struct bgp_path_info,
 100  * used for uncommonly used data (aggregation, MPLS, etc.)
 101  * and lazily allocated to save memory.
 102  */
 103 struct bgp_path_info_extra {
 104         /* Pointer to dampening structure.  */
 105         struct bgp_damp_info *damp_info;
 106
 107         /* This route is suppressed with aggregation.  */
 108         int suppress;
 109
 110         /* Nexthop reachability check.  */
 111         uint32_t igpmetric;
 112
 113         /* MPLS label(s) - VNI(s) for EVPN-VxLAN  */
 114         mpls_label_t label[BGP_MAX_LABELS];
 115         uint32_t num_labels;
 116
 117 #if ENABLE_BGP_VNC
 118         union {
 119
 120                 struct {
 121                         void *rfapi_handle; /* export: NVE advertising this
 122                                                route */
 123                         struct list *local_nexthops; /* optional, for static
 124                                                         routes */
 125                 } export;
 126
 127                 struct {
 128                         struct thread *timer;
 129                         void *hme; /* encap monitor, if this is a VPN route */
 130                         struct prefix_rd
 131                                 rd; /* import: route's route-distinguisher */
 132                         uint8_t un_family; /* family of cached un address, 0 if
 133                                              unset */
 134                         union {
 135                                 struct in_addr addr4;
 136                                 struct in6_addr addr6;
 137                         } un; /* cached un address */
 138                         time_t create_time;
 139                         struct prefix aux_prefix; /* AFI_L2VPN: the IP addr,
 140                                                      if family set */
 141                 } import;
 142
 143         } vnc;
 144 #endif
 145
 146         /* For imported routes into a VNI (or VRF), this points to the parent.
 147          */
 148         void *parent;
 149
 150         /*
 151          * Some tunnelish parameters follow. Maybe consolidate into an
 152          * internal tunnel structure?
 153          */
 154
 155         /*
 156          * Original bgp instance for imported routes. Needed for:
 157          * 1. Find all routes from a specific vrf for deletion
 158          * 2. vrf context of original nexthop
 159          *
 160          * Store pointer to bgp instance rather than bgp->vrf_id because
 161          * bgp->vrf_id is not always valid (or may change?).
 162          *
 163          * Set to NULL if route is not imported from another bgp instance.
 164          */
 165         struct bgp *bgp_orig;
 166
 167         /*
 168          * Nexthop in context of original bgp instance. Needed
 169          * for label resolution of core mpls routes exported to a vrf.
 170          * Set nexthop_orig.family to 0 if not valid.
 171          */
 172         struct prefix nexthop_orig;
 173         /* presence of FS pbr firewall based entry */
 174         struct list *bgp_fs_pbr;
 175         /* presence of FS pbr iprule based entry */
 176         struct list *bgp_fs_iprule;
 177 };
 178
 179 struct bgp_path_info {
 180         /* For linked list. */
 181         struct bgp_path_info *next;
 182         struct bgp_path_info *prev;
 183
 184         /* For nexthop linked list */
 185         LIST_ENTRY(bgp_path_info) nh_thread;
 186
 187         /* Back pointer to the prefix node */
 188         struct bgp_node *net;
 189
 190         /* Back pointer to the nexthop structure */
 191         struct bgp_nexthop_cache *nexthop;
 192
 193         /* Peer structure.  */
 194         struct peer *peer;
 195
 196         /* Attribute structure.  */
 197         struct attr *attr;
 198
 199         /* Extra information */
 200         struct bgp_path_info_extra *extra;
 201
 202
 203         /* Multipath information */
 204         struct bgp_path_info_mpath *mpath;
 205
 206         /* Uptime.  */
 207         time_t uptime;
 208
 209         /* reference count */
 210         int lock;
 211
 212         /* BGP information status.  */
 213         uint16_t flags;
 214 #define BGP_PATH_IGP_CHANGED (1 << 0)
 215 #define BGP_PATH_DAMPED (1 << 1)
 216 #define BGP_PATH_HISTORY (1 << 2)
 217 #define BGP_PATH_SELECTED (1 << 3)
 218 #define BGP_PATH_VALID (1 << 4)
 219 #define BGP_PATH_ATTR_CHANGED (1 << 5)
 220 #define BGP_PATH_DMED_CHECK (1 << 6)
 221 #define BGP_PATH_DMED_SELECTED (1 << 7)
 222 #define BGP_PATH_STALE (1 << 8)
 223 #define BGP_PATH_REMOVED (1 << 9)
 224 #define BGP_PATH_COUNTED (1 << 10)
 225 #define BGP_PATH_MULTIPATH (1 << 11)
 226 #define BGP_PATH_MULTIPATH_CHG (1 << 12)
 227 #define BGP_PATH_RIB_ATTR_CHG (1 << 13)
 228 #define BGP_PATH_ANNC_NH_SELF (1 << 14)
 229
 230         /* BGP route type.  This can be static, RIP, OSPF, BGP etc.  */
 231         uint8_t type;
 232
 233         /* When above type is BGP.  This sub type specify BGP sub type
 234            information.  */
 235         uint8_t sub_type;
 236 #define BGP_ROUTE_NORMAL       0
 237 #define BGP_ROUTE_STATIC       1
 238 #define BGP_ROUTE_AGGREGATE    2
 239 #define BGP_ROUTE_REDISTRIBUTE 3
 240 #ifdef ENABLE_BGP_VNC
 241 # define BGP_ROUTE_RFP          4
 242 #endif
 243 #define BGP_ROUTE_IMPORTED     5        /* from another bgp instance/safi */
 244
 245         unsigned short instance;
 246
 247         /* Addpath identifiers */
 248         uint32_t addpath_rx_id;
 249         struct bgp_addpath_info_data tx_addpath;
 250 };
 251
 252 /* Structure used in BGP path selection */
 253 struct bgp_path_info_pair {
 254         struct bgp_path_info *old;
 255         struct bgp_path_info *new;
 256 };
 257
 258 /* BGP static route configuration. */
 259 struct bgp_static {
 260         /* Backdoor configuration.  */
 261         int backdoor;
 262
 263         /* Label index configuration; applies to LU prefixes. */
 264         uint32_t label_index;
 265 #define BGP_INVALID_LABEL_INDEX   0xFFFFFFFF
 266
 267         /* Import check status.  */
 268         uint8_t valid;
 269
 270         /* IGP metric. */
 271         uint32_t igpmetric;
 272
 273         /* IGP nexthop. */
 274         struct in_addr igpnexthop;
 275
 276         /* Atomic set reference count (ie cause of pathlimit) */
 277         uint32_t atomic;
 278
 279         /* BGP redistribute route-map.  */
 280         struct {
 281                 char *name;
 282                 struct route_map *map;
 283         } rmap;
 284
 285         /* Route Distinguisher */
 286         struct prefix_rd prd;
 287
 288         /* MPLS label.  */
 289         mpls_label_t label;
 290
 291         /* EVPN */
 292         struct eth_segment_id *eth_s_id;
 293         struct ethaddr *router_mac;
 294         uint16_t encap_tunneltype;
 295         struct prefix gatewayIp;
 296 };
 297
 298 /* Aggreagete address:
 299  *
 300  *  advertise-map  Set condition to advertise attribute
 301  *  as-set         Generate AS set path information
 302  *  attribute-map  Set attributes of aggregate
 303  *  route-map      Set parameters of aggregate
 304  *  summary-only   Filter more specific routes from updates
 305  *  suppress-map   Conditionally filter more specific routes from updates
 306  *  <cr>
 307  */
 308 struct bgp_aggregate {
 309         /* Summary-only flag. */
 310         uint8_t summary_only;
 311
 312         /* AS set generation. */
 313         uint8_t as_set;
 314
 315         /* Route-map for aggregated route. */
 316         struct {
 317                 char *name;
 318                 struct route_map *map;
 319         } rmap;
 320
 321         /* Suppress-count. */
 322         unsigned long count;
 323
 324         /* Count of routes of origin type incomplete under this aggregate. */
 325         unsigned long incomplete_origin_count;
 326
 327         /* Count of routes of origin type egp under this aggregate. */
 328         unsigned long egp_origin_count;
 329
 330         /* Hash containing the communities of all the
 331          * routes under this aggregate.
 332          */
 333         struct hash *community_hash;
 334
 335         /* Hash containing the extended communities of all the
 336          * routes under this aggregate.
 337          */
 338         struct hash *ecommunity_hash;
 339
 340         /* Hash containing the large communities of all the
 341          * routes under this aggregate.
 342          */
 343         struct hash *lcommunity_hash;
 344
 345         /* Hash containing the AS-Path of all the
 346          * routes under this aggregate.
 347          */
 348         struct hash *aspath_hash;
 349
 350         /* Aggregate route's community. */
 351         struct community *community;
 352
 353         /* Aggregate route's extended community. */
 354         struct ecommunity *ecommunity;
 355
 356         /* Aggregate route's large community. */
 357         struct lcommunity *lcommunity;
 358
 359         /* Aggregate route's as-path. */
 360         struct aspath *aspath;
 361
 362         /* SAFI configuration. */
 363         safi_t safi;
 364 };
 365
 366 #define BGP_NEXTHOP_AFI_FROM_NHLEN(nhlen)                                      \
 367         ((nhlen) < IPV4_MAX_BYTELEN                                            \
 368                  ? 0                                                           \
 369                  : ((nhlen) < IPV6_MAX_BYTELEN ? AFI_IP : AFI_IP6))
 370
 371 #define BGP_ATTR_NEXTHOP_AFI_IP6(attr)                                         \
 372         (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP))             \
 373          && ((attr)->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL              \
 374              || (attr)->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL    \
 375              || (attr)->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL          \
 376              || (attr)->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL))
 377 #define BGP_PATH_COUNTABLE(BI)                                                 \
 378         (!CHECK_FLAG((BI)->flags, BGP_PATH_HISTORY)                            \
 379          && !CHECK_FLAG((BI)->flags, BGP_PATH_REMOVED))
 380
 381 /* Flags which indicate a route is unuseable in some form */
 382 #define BGP_PATH_UNUSEABLE                                                     \
 383         (BGP_PATH_HISTORY | BGP_PATH_DAMPED | BGP_PATH_REMOVED)
 384 /* Macro to check BGP information is alive or not.  Sadly,
 385  * not equivalent to just checking previous, because of the
 386  * sense of the additional VALID flag.
 387  */
 388 #define BGP_PATH_HOLDDOWN(BI)                                                  \
 389         (!CHECK_FLAG((BI)->flags, BGP_PATH_VALID)                              \
 390          || CHECK_FLAG((BI)->flags, BGP_PATH_UNUSEABLE))
 391
 392 #define DISTRIBUTE_IN_NAME(F)   ((F)->dlist[FILTER_IN].name)
 393 #define DISTRIBUTE_IN(F)        ((F)->dlist[FILTER_IN].alist)
 394 #define DISTRIBUTE_OUT_NAME(F)  ((F)->dlist[FILTER_OUT].name)
 395 #define DISTRIBUTE_OUT(F)       ((F)->dlist[FILTER_OUT].alist)
 396
 397 #define PREFIX_LIST_IN_NAME(F)  ((F)->plist[FILTER_IN].name)
 398 #define PREFIX_LIST_IN(F)       ((F)->plist[FILTER_IN].plist)
 399 #define PREFIX_LIST_OUT_NAME(F) ((F)->plist[FILTER_OUT].name)
 400 #define PREFIX_LIST_OUT(F)      ((F)->plist[FILTER_OUT].plist)
 401
 402 #define FILTER_LIST_IN_NAME(F)  ((F)->aslist[FILTER_IN].name)
 403 #define FILTER_LIST_IN(F)       ((F)->aslist[FILTER_IN].aslist)
 404 #define FILTER_LIST_OUT_NAME(F) ((F)->aslist[FILTER_OUT].name)
 405 #define FILTER_LIST_OUT(F)      ((F)->aslist[FILTER_OUT].aslist)
 406
 407 #define ROUTE_MAP_IN_NAME(F)    ((F)->map[RMAP_IN].name)
 408 #define ROUTE_MAP_IN(F)         ((F)->map[RMAP_IN].map)
 409 #define ROUTE_MAP_OUT_NAME(F)   ((F)->map[RMAP_OUT].name)
 410 #define ROUTE_MAP_OUT(F)        ((F)->map[RMAP_OUT].map)
 411
 412 #define UNSUPPRESS_MAP_NAME(F)  ((F)->usmap.name)
 413 #define UNSUPPRESS_MAP(F)       ((F)->usmap.map)
 414
 415 /* path PREFIX (addpath rxid NUMBER) */
 416 #define PATH_ADDPATH_STR_BUFFER PREFIX2STR_BUFFER + 32
 417
 418 enum bgp_path_type {
 419         BGP_PATH_SHOW_ALL,
 420         BGP_PATH_SHOW_BESTPATH,
 421         BGP_PATH_SHOW_MULTIPATH
 422 };
 423
 424 static inline void bgp_bump_version(struct bgp_node *node)
 425 {
 426         node->version = bgp_table_next_version(bgp_node_table(node));
 427 }
 428
 429 static inline int bgp_fibupd_safi(safi_t safi)
 430 {
 431         if (safi == SAFI_UNICAST || safi == SAFI_MULTICAST
 432             || safi == SAFI_LABELED_UNICAST
 433             || safi == SAFI_FLOWSPEC)
 434                 return 1;
 435         return 0;
 436 }
 437
 438 /* Flag if the route path's family matches params. */
 439 static inline bool is_pi_family_matching(struct bgp_path_info *pi,
 440                                          afi_t afi, safi_t safi)
 441 {
 442         struct bgp_table *table;
 443         struct bgp_node *rn;
 444
 445         rn = pi->net;
 446         if (!rn)
 447                 return false;
 448         table = bgp_node_table(rn);
 449         if (table &&
 450             table->afi == afi &&
 451             table->safi == safi)
 452                 return true;
 453         return false;
 454 }
 455
 456 /* called before bgp_process() */
 457 DECLARE_HOOK(bgp_process,
 458                 (struct bgp *bgp, afi_t afi, safi_t safi,
 459                         struct bgp_node *bn, struct peer *peer, bool withdraw),
 460                 (bgp, afi, safi, bn, peer, withdraw))
 461
 462 /* Prototypes. */
 463 extern void bgp_rib_remove(struct bgp_node *rn, struct bgp_path_info *pi,
 464                            struct peer *peer, afi_t afi, safi_t safi);
 465 extern void bgp_process_queue_init(void);
 466 extern void bgp_route_init(void);
 467 extern void bgp_route_finish(void);
 468 extern void bgp_cleanup_routes(struct bgp *);
 469 extern void bgp_announce_route(struct peer *, afi_t, safi_t);
 470 extern void bgp_stop_announce_route_timer(struct peer_af *paf);
 471 extern void bgp_announce_route_all(struct peer *);
 472 extern void bgp_default_originate(struct peer *, afi_t, safi_t, int);
 473 extern void bgp_soft_reconfig_in(struct peer *, afi_t, safi_t);
 474 extern void bgp_clear_route(struct peer *, afi_t, safi_t);
 475 extern void bgp_clear_route_all(struct peer *);
 476 extern void bgp_clear_adj_in(struct peer *, afi_t, safi_t);
 477 extern void bgp_clear_stale_route(struct peer *, afi_t, safi_t);
 478 extern int bgp_outbound_policy_exists(struct peer *, struct bgp_filter *);
 479 extern int bgp_inbound_policy_exists(struct peer *, struct bgp_filter *);
 480
 481 extern struct bgp_node *bgp_afi_node_get(struct bgp_table *table, afi_t afi,
 482                                          safi_t safi, struct prefix *p,
 483                                          struct prefix_rd *prd);
 484 extern struct bgp_path_info *bgp_path_info_lock(struct bgp_path_info *path);
 485 extern struct bgp_path_info *bgp_path_info_unlock(struct bgp_path_info *path);
 486 extern void bgp_path_info_add(struct bgp_node *rn, struct bgp_path_info *pi);
 487 extern void bgp_path_info_extra_free(struct bgp_path_info_extra **extra);
 488 extern void bgp_path_info_reap(struct bgp_node *rn, struct bgp_path_info *pi);
 489 extern void bgp_path_info_delete(struct bgp_node *rn, struct bgp_path_info *pi);
 490 extern struct bgp_path_info_extra *
 491 bgp_path_info_extra_get(struct bgp_path_info *path);
 492 extern void bgp_path_info_set_flag(struct bgp_node *rn,
 493                                    struct bgp_path_info *path, uint32_t flag);
 494 extern void bgp_path_info_unset_flag(struct bgp_node *rn,
 495                                      struct bgp_path_info *path, uint32_t flag);
 496 extern void bgp_path_info_path_with_addpath_rx_str(struct bgp_path_info *pi,
 497                                                    char *buf);
 498
 499 extern int bgp_nlri_parse_ip(struct peer *, struct attr *, struct bgp_nlri *);
 500
 501 extern int bgp_maximum_prefix_overflow(struct peer *, afi_t, safi_t, int);
 502
 503 extern void bgp_redistribute_add(struct bgp *bgp, struct prefix *p,
 504                                  const union g_addr *nexthop, ifindex_t ifindex,
 505                                  enum nexthop_types_t nhtype, uint32_t metric,
 506                                  uint8_t type, unsigned short instance,
 507                                  route_tag_t tag);
 508 extern void bgp_redistribute_delete(struct bgp *, struct prefix *, uint8_t,
 509                                     unsigned short);
 510 extern void bgp_redistribute_withdraw(struct bgp *, afi_t, int, unsigned short);
 511
 512 extern void bgp_static_add(struct bgp *);
 513 extern void bgp_static_delete(struct bgp *);
 514 extern void bgp_static_redo_import_check(struct bgp *);
 515 extern void bgp_purge_static_redist_routes(struct bgp *bgp);
 516 extern void bgp_static_update(struct bgp *, struct prefix *,
 517                               struct bgp_static *, afi_t, safi_t);
 518 extern void bgp_static_withdraw(struct bgp *, struct prefix *, afi_t, safi_t);
 519
 520 extern int bgp_static_set_safi(afi_t afi, safi_t safi, struct vty *vty,
 521                                const char *, const char *, const char *,
 522                                const char *, int, const char *, const char *,
 523                                const char *, const char *);
 524
 525 extern int bgp_static_unset_safi(afi_t afi, safi_t safi, struct vty *,
 526                                  const char *, const char *, const char *, int,
 527                                  const char *, const char *, const char *);
 528
 529 /* this is primarily for MPLS-VPN */
 530 extern int bgp_update(struct peer *, struct prefix *, uint32_t, struct attr *,
 531                       afi_t, safi_t, int, int, struct prefix_rd *,
 532                       mpls_label_t *, uint32_t, int, struct bgp_route_evpn *);
 533 extern int bgp_withdraw(struct peer *, struct prefix *, uint32_t, struct attr *,
 534                         afi_t, safi_t, int, int, struct prefix_rd *,
 535                         mpls_label_t *, uint32_t, struct bgp_route_evpn *);
 536
 537 /* for bgp_nexthop and bgp_damp */
 538 extern void bgp_process(struct bgp *, struct bgp_node *, afi_t, safi_t);
 539
 540 /*
 541  * Add an end-of-initial-update marker to the process queue. This is just a
 542  * queue element with NULL bgp node.
 543  */
 544 extern void bgp_add_eoiu_mark(struct bgp *);
 545 extern void bgp_config_write_table_map(struct vty *, struct bgp *, afi_t,
 546                                        safi_t);
 547 extern void bgp_config_write_network(struct vty *, struct bgp *, afi_t, safi_t);
 548 extern void bgp_config_write_distance(struct vty *, struct bgp *, afi_t,
 549                                       safi_t);
 550
 551 extern void bgp_aggregate_delete(struct bgp *bgp, struct prefix *p, afi_t afi,
 552                                  safi_t safi, struct bgp_aggregate *aggregate);
 553 extern void bgp_aggregate_route(struct bgp *bgp, struct prefix *p, afi_t afi,
 554                                 safi_t safi, struct bgp_aggregate *aggregate);
 555 extern void bgp_aggregate_increment(struct bgp *bgp, struct prefix *p,
 556                                     struct bgp_path_info *path, afi_t afi,
 557                                     safi_t safi);
 558 extern void bgp_aggregate_decrement(struct bgp *bgp, struct prefix *p,
 559                                     struct bgp_path_info *path, afi_t afi,
 560                                     safi_t safi);
 561
 562 extern uint8_t bgp_distance_apply(struct prefix *p, struct bgp_path_info *path,
 563                                   afi_t afi, safi_t safi, struct bgp *bgp);
 564
 565 extern afi_t bgp_node_afi(struct vty *);
 566 extern safi_t bgp_node_safi(struct vty *);
 567
 568 extern struct bgp_path_info *info_make(int type, int sub_type,
 569                                        unsigned short instance,
 570                                        struct peer *peer, struct attr *attr,
 571                                        struct bgp_node *rn);
 572
 573 extern void route_vty_out(struct vty *vty, struct prefix *p,
 574                           struct bgp_path_info *path, int display, safi_t safi,
 575                           json_object *json_paths);
 576 extern void route_vty_out_tag(struct vty *vty, struct prefix *p,
 577                               struct bgp_path_info *path, int display,
 578                               safi_t safi, json_object *json);
 579 extern void route_vty_out_tmp(struct vty *vty, struct prefix *p,
 580                               struct attr *attr, safi_t safi, bool use_json,
 581                               json_object *json_ar);
 582 extern void route_vty_out_overlay(struct vty *vty, struct prefix *p,
 583                                   struct bgp_path_info *path, int display,
 584                                   json_object *json);
 585
 586 extern int subgroup_process_announce_selected(struct update_subgroup *subgrp,
 587                                               struct bgp_path_info *selected,
 588                                               struct bgp_node *rn,
 589                                               uint32_t addpath_tx_id);
 590
 591 extern int subgroup_announce_check(struct bgp_node *rn,
 592                                    struct bgp_path_info *pi,
 593                                    struct update_subgroup *subgrp,
 594                                    struct prefix *p, struct attr *attr);
 595
 596 extern void bgp_peer_clear_node_queue_drain_immediate(struct peer *peer);
 597 extern void bgp_process_queues_drain_immediate(void);
 598
 599 /* for encap/vpn */
 600 extern struct bgp_node *bgp_afi_node_lookup(struct bgp_table *table, afi_t afi,
 601                                             safi_t safi, struct prefix *p,
 602                                             struct prefix_rd *prd);
 603 extern void bgp_path_info_restore(struct bgp_node *rn,
 604                                   struct bgp_path_info *path);
 605
 606 extern int bgp_path_info_cmp_compatible(struct bgp *bgp,
 607                                         struct bgp_path_info *new,
 608                                         struct bgp_path_info *exist,
 609                                         char *pfx_buf, afi_t afi, safi_t safi,
 610                                         enum bgp_path_selection_reason *reason);
 611 extern void bgp_attr_add_gshut_community(struct attr *attr);
 612
 613 extern void bgp_best_selection(struct bgp *bgp, struct bgp_node *rn,
 614                                struct bgp_maxpaths_cfg *mpath_cfg,
 615                                struct bgp_path_info_pair *result, afi_t afi,
 616                                safi_t safi);
 617 extern void bgp_zebra_clear_route_change_flags(struct bgp_node *rn);
 618 extern int bgp_zebra_has_route_changed(struct bgp_node *rn,
 619                                        struct bgp_path_info *selected);
 620
 621 extern void route_vty_out_detail_header(struct vty *vty, struct bgp *bgp,
 622                                         struct bgp_node *rn,
 623                                         struct prefix_rd *prd, afi_t afi,
 624                                         safi_t safi, json_object *json);
 625 extern void route_vty_out_detail(struct vty *vty, struct bgp *bgp,
 626                                  struct bgp_node *bn,
 627                                  struct bgp_path_info *path,
 628                                  afi_t afi, safi_t safi,
 629                                  json_object *json_paths);
 630 extern int bgp_show_table_rd(struct vty *vty, struct bgp *bgp, safi_t safi,
 631                              struct bgp_table *table, struct prefix_rd *prd,
 632                              enum bgp_show_type type, void *output_arg,
 633                              bool use_json);
 634 #endif /* _QUAGGA_BGP_ROUTE_H */