bgpd/bgp_updgrp_adv.c

   1 /**
   2  * bgp_updgrp_adv.c: BGP update group advertisement and adjacency
   3  *                   maintenance
   4  *
   5  *
   6  * @copyright Copyright (C) 2014 Cumulus Networks, Inc.
   7  *
   8  * @author Avneesh Sachdev <avneesh@sproute.net>
   9  * @author Rajesh Varadarajan <rajesh@sproute.net>
  10  * @author Pradosh Mohapatra <pradosh@sproute.net>
  11  *
  12  * This file is part of GNU Zebra.
  13  *
  14  * GNU Zebra is free software; you can redistribute it and/or modify it
  15  * under the terms of the GNU General Public License as published by the
  16  * Free Software Foundation; either version 2, or (at your option) any
  17  * later version.
  18  *
  19  * GNU Zebra is distributed in the hope that it will be useful, but
  20  * WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  22  * General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License along
  25  * with this program; see the file COPYING; if not, write to the Free Software
  26  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  27  */
  28
  29 #include <zebra.h>
  30
  31 #include "command.h"
  32 #include "memory.h"
  33 #include "prefix.h"
  34 #include "hash.h"
  35 #include "thread.h"
  36 #include "queue.h"
  37 #include "routemap.h"
  38 #include "filter.h"
  39
  40 #include "bgpd/bgpd.h"
  41 #include "bgpd/bgp_table.h"
  42 #include "bgpd/bgp_debug.h"
  43 #include "bgpd/bgp_route.h"
  44 #include "bgpd/bgp_advertise.h"
  45 #include "bgpd/bgp_attr.h"
  46 #include "bgpd/bgp_aspath.h"
  47 #include "bgpd/bgp_packet.h"
  48 #include "bgpd/bgp_fsm.h"
  49 #include "bgpd/bgp_mplsvpn.h"
  50 #include "bgpd/bgp_updgrp.h"
  51 #include "bgpd/bgp_advertise.h"
  52 #include "bgpd/bgp_addpath.h"
  53
  54
  55 /********************
  56  * PRIVATE FUNCTIONS
  57  ********************/
  58 static int bgp_adj_out_compare(const struct bgp_adj_out *o1,
  59                                const struct bgp_adj_out *o2)
  60 {
  61         if (o1->subgroup < o2->subgroup)
  62                 return -1;
  63
  64         if (o1->subgroup > o2->subgroup)
  65                 return 1;
  66
  67         if (o1->addpath_tx_id < o2->addpath_tx_id)
  68                 return -1;
  69
  70         if (o1->addpath_tx_id > o2->addpath_tx_id)
  71                 return 1;
  72
  73         return 0;
  74 }
  75 RB_GENERATE(bgp_adj_out_rb, bgp_adj_out, adj_entry, bgp_adj_out_compare);
  76
  77 static inline struct bgp_adj_out *adj_lookup(struct bgp_node *rn,
  78                                              struct update_subgroup *subgrp,
  79                                              uint32_t addpath_tx_id)
  80 {
  81         struct bgp_adj_out lookup;
  82
  83         if (!rn || !subgrp)
  84                 return NULL;
  85
  86         /* update-groups that do not support addpath will pass 0 for
  87          * addpath_tx_id. */
  88         lookup.subgroup = subgrp;
  89         lookup.addpath_tx_id = addpath_tx_id;
  90
  91         return RB_FIND(bgp_adj_out_rb, &rn->adj_out, &lookup);
  92 }
  93
  94 static void adj_free(struct bgp_adj_out *adj)
  95 {
  96         TAILQ_REMOVE(&(adj->subgroup->adjq), adj, subgrp_adj_train);
  97         SUBGRP_DECR_STAT(adj->subgroup, adj_count);
  98         XFREE(MTYPE_BGP_ADJ_OUT, adj);
  99 }
 100
 101 static void subgrp_withdraw_stale_addpath(struct updwalk_context *ctx,
 102                                           struct update_subgroup *subgrp)
 103 {
 104         struct bgp_adj_out *adj, *adj_next;
 105         uint32_t id;
 106         struct bgp_path_info *pi;
 107         afi_t afi = SUBGRP_AFI(subgrp);
 108         safi_t safi = SUBGRP_SAFI(subgrp);
 109         struct peer *peer = SUBGRP_PEER(subgrp);
 110
 111         /* Look through all of the paths we have advertised for this rn and send
 112          * a withdraw for the ones that are no longer present */
 113         RB_FOREACH_SAFE (adj, bgp_adj_out_rb, &ctx->rn->adj_out, adj_next) {
 114
 115                 if (adj->subgroup == subgrp) {
 116                         for (pi = bgp_node_get_bgp_path_info(ctx->rn);
 117                              pi; pi = pi->next) {
 118                                 id = bgp_addpath_id_for_peer(peer, afi, safi,
 119                                         &pi->tx_addpath);
 120
 121                                 if (id == adj->addpath_tx_id) {
 122                                         break;
 123                                 }
 124                         }
 125
 126                         if (!pi) {
 127                                 subgroup_process_announce_selected(
 128                                         subgrp, NULL, ctx->rn,
 129                                         adj->addpath_tx_id);
 130                         }
 131                 }
 132         }
 133 }
 134
 135 static int group_announce_route_walkcb(struct update_group *updgrp, void *arg)
 136 {
 137         struct updwalk_context *ctx = arg;
 138         struct update_subgroup *subgrp;
 139         struct bgp_path_info *pi;
 140         afi_t afi;
 141         safi_t safi;
 142         struct peer *peer;
 143         struct bgp_adj_out *adj, *adj_next;
 144         int addpath_capable;
 145
 146         afi = UPDGRP_AFI(updgrp);
 147         safi = UPDGRP_SAFI(updgrp);
 148         peer = UPDGRP_PEER(updgrp);
 149         addpath_capable = bgp_addpath_encode_tx(peer, afi, safi);
 150
 151         if (BGP_DEBUG(update, UPDATE_OUT)) {
 152                 char buf_prefix[PREFIX_STRLEN];
 153                 prefix2str(&ctx->rn->p, buf_prefix, sizeof(buf_prefix));
 154                 zlog_debug("%s: afi=%s, safi=%s, p=%s", __func__, afi2str(afi),
 155                            safi2str(safi), buf_prefix);
 156         }
 157
 158
 159         UPDGRP_FOREACH_SUBGRP (updgrp, subgrp) {
 160
 161                 /*
 162                  * Skip the subgroups that have coalesce timer running. We will
 163                  * walk the entire prefix table for those subgroups when the
 164                  * coalesce timer fires.
 165                  */
 166                 if (!subgrp->t_coalesce) {
 167                         /* An update-group that uses addpath */
 168                         if (addpath_capable) {
 169                                 subgrp_withdraw_stale_addpath(ctx, subgrp);
 170
 171                                 for (pi = bgp_node_get_bgp_path_info(ctx->rn);
 172                                      pi; pi = pi->next) {
 173                                         /* Skip the bestpath for now */
 174                                         if (pi == ctx->pi)
 175                                                 continue;
 176
 177                                         subgroup_process_announce_selected(
 178                                                 subgrp, pi, ctx->rn,
 179                                                 bgp_addpath_id_for_peer(
 180                                                         peer, afi, safi,
 181                                                         &pi->tx_addpath));
 182                                 }
 183
 184                                 /* Process the bestpath last so the "show [ip]
 185                                  * bgp neighbor x.x.x.x advertised"
 186                                  * output shows the attributes from the bestpath
 187                                  */
 188                                 if (ctx->pi)
 189                                         subgroup_process_announce_selected(
 190                                                 subgrp, ctx->pi, ctx->rn,
 191                                                 bgp_addpath_id_for_peer(
 192                                                         peer, afi, safi,
 193                                                         &ctx->pi->tx_addpath));
 194                         }
 195
 196                         /* An update-group that does not use addpath */
 197                         else {
 198                                 if (ctx->pi) {
 199                                         subgroup_process_announce_selected(
 200                                                 subgrp, ctx->pi, ctx->rn,
 201                                                 bgp_addpath_id_for_peer(
 202                                                         peer, afi, safi,
 203                                                         &ctx->pi->tx_addpath));
 204                                 } else {
 205                                         /* Find the addpath_tx_id of the path we
 206                                          * had advertised and
 207                                          * send a withdraw */
 208                                         RB_FOREACH_SAFE (adj, bgp_adj_out_rb,
 209                                                          &ctx->rn->adj_out,
 210                                                          adj_next) {
 211                                                 if (adj->subgroup == subgrp) {
 212                                                         subgroup_process_announce_selected(
 213                                                                 subgrp, NULL,
 214                                                                 ctx->rn,
 215                                                                 adj->addpath_tx_id);
 216                                                 }
 217                                         }
 218                                 }
 219                         }
 220                 }
 221         }
 222
 223         return UPDWALK_CONTINUE;
 224 }
 225
 226 static void subgrp_show_adjq_vty(struct update_subgroup *subgrp,
 227                                  struct vty *vty, uint8_t flags)
 228 {
 229         struct bgp_table *table;
 230         struct bgp_adj_out *adj;
 231         unsigned long output_count;
 232         struct bgp_node *rn;
 233         int header1 = 1;
 234         struct bgp *bgp;
 235         int header2 = 1;
 236
 237         bgp = SUBGRP_INST(subgrp);
 238         if (!bgp)
 239                 return;
 240
 241         table = bgp->rib[SUBGRP_AFI(subgrp)][SUBGRP_SAFI(subgrp)];
 242
 243         output_count = 0;
 244
 245         for (rn = bgp_table_top(table); rn; rn = bgp_route_next(rn))
 246                 RB_FOREACH (adj, bgp_adj_out_rb, &rn->adj_out)
 247                         if (adj->subgroup == subgrp) {
 248                                 if (header1) {
 249                                         vty_out(vty,
 250                                                 "BGP table version is %" PRIu64
 251                                                 ", local router ID is %s\n",
 252                                                 table->version,
 253                                                 inet_ntoa(bgp->router_id));
 254                                         vty_out(vty, BGP_SHOW_SCODE_HEADER);
 255                                         vty_out(vty, BGP_SHOW_OCODE_HEADER);
 256                                         header1 = 0;
 257                                 }
 258                                 if (header2) {
 259                                         vty_out(vty, BGP_SHOW_HEADER);
 260                                         header2 = 0;
 261                                 }
 262                                 if ((flags & UPDWALK_FLAGS_ADVQUEUE) && adj->adv
 263                                     && adj->adv->baa) {
 264                                         route_vty_out_tmp(vty, &rn->p,
 265                                                           adj->adv->baa->attr,
 266                                                           SUBGRP_SAFI(subgrp),
 267                                                           0, NULL);
 268                                         output_count++;
 269                                 }
 270                                 if ((flags & UPDWALK_FLAGS_ADVERTISED)
 271                                     && adj->attr) {
 272                                         route_vty_out_tmp(
 273                                                 vty, &rn->p, adj->attr,
 274                                                 SUBGRP_SAFI(subgrp), 0, NULL);
 275                                         output_count++;
 276                                 }
 277                         }
 278         if (output_count != 0)
 279                 vty_out(vty, "\nTotal number of prefixes %ld\n", output_count);
 280 }
 281
 282 static int updgrp_show_adj_walkcb(struct update_group *updgrp, void *arg)
 283 {
 284         struct updwalk_context *ctx = arg;
 285         struct update_subgroup *subgrp;
 286         struct vty *vty;
 287
 288         vty = ctx->vty;
 289         UPDGRP_FOREACH_SUBGRP (updgrp, subgrp) {
 290                 if (ctx->subgrp_id && (ctx->subgrp_id != subgrp->id))
 291                         continue;
 292                 vty_out(vty, "update group %" PRIu64 ", subgroup %" PRIu64 "\n",
 293                         updgrp->id, subgrp->id);
 294                 subgrp_show_adjq_vty(subgrp, vty, ctx->flags);
 295         }
 296         return UPDWALK_CONTINUE;
 297 }
 298
 299 static void updgrp_show_adj(struct bgp *bgp, afi_t afi, safi_t safi,
 300                             struct vty *vty, uint64_t id, uint8_t flags)
 301 {
 302         struct updwalk_context ctx;
 303         memset(&ctx, 0, sizeof(ctx));
 304         ctx.vty = vty;
 305         ctx.subgrp_id = id;
 306         ctx.flags = flags;
 307
 308         update_group_af_walk(bgp, afi, safi, updgrp_show_adj_walkcb, &ctx);
 309 }
 310
 311 static int subgroup_coalesce_timer(struct thread *thread)
 312 {
 313         struct update_subgroup *subgrp;
 314
 315         subgrp = THREAD_ARG(thread);
 316         if (bgp_debug_update(NULL, NULL, subgrp->update_group, 0))
 317                 zlog_debug("u%" PRIu64 ":s%" PRIu64
 318                            " announcing routes upon coalesce timer expiry(%u ms)",
 319                            (SUBGRP_UPDGRP(subgrp))->id, subgrp->id,
 320                            subgrp->v_coalesce),
 321         subgrp->t_coalesce = NULL;
 322         subgrp->v_coalesce = 0;
 323         subgroup_announce_route(subgrp);
 324
 325
 326         /* While the announce_route() may kick off the route advertisement timer
 327          * for
 328          * the members of the subgroup, we'd like to send the initial updates
 329          * much
 330          * faster (i.e., without enforcing MRAI). Also, if there were no routes
 331          * to
 332          * announce, this is the method currently employed to trigger the EOR.
 333          */
 334         if (!bgp_update_delay_active(SUBGRP_INST(subgrp))) {
 335                 struct peer_af *paf;
 336                 struct peer *peer;
 337
 338                 SUBGRP_FOREACH_PEER (subgrp, paf) {
 339                         peer = PAF_PEER(paf);
 340                         BGP_TIMER_OFF(peer->t_routeadv);
 341                         BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0);
 342                 }
 343         }
 344
 345         return 0;
 346 }
 347
 348 static int update_group_announce_walkcb(struct update_group *updgrp, void *arg)
 349 {
 350         struct update_subgroup *subgrp;
 351
 352         UPDGRP_FOREACH_SUBGRP (updgrp, subgrp) {
 353                 subgroup_announce_all(subgrp);
 354         }
 355
 356         return UPDWALK_CONTINUE;
 357 }
 358
 359 static int update_group_announce_rrc_walkcb(struct update_group *updgrp,
 360                                             void *arg)
 361 {
 362         struct update_subgroup *subgrp;
 363         afi_t afi;
 364         safi_t safi;
 365         struct peer *peer;
 366
 367         afi = UPDGRP_AFI(updgrp);
 368         safi = UPDGRP_SAFI(updgrp);
 369         peer = UPDGRP_PEER(updgrp);
 370
 371         /* Only announce if this is a group of route-reflector-clients */
 372         if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_REFLECTOR_CLIENT)) {
 373                 UPDGRP_FOREACH_SUBGRP (updgrp, subgrp) {
 374                         subgroup_announce_all(subgrp);
 375                 }
 376         }
 377
 378         return UPDWALK_CONTINUE;
 379 }
 380
 381 /********************
 382  * PUBLIC FUNCTIONS
 383  ********************/
 384
 385 /**
 386  * Allocate an adj-out object. Do proper initialization of its fields,
 387  * primarily its association with the subgroup and the prefix.
 388  */
 389 struct bgp_adj_out *bgp_adj_out_alloc(struct update_subgroup *subgrp,
 390                                       struct bgp_node *rn,
 391                                       uint32_t addpath_tx_id)
 392 {
 393         struct bgp_adj_out *adj;
 394
 395         adj = XCALLOC(MTYPE_BGP_ADJ_OUT, sizeof(struct bgp_adj_out));
 396         adj->subgroup = subgrp;
 397         adj->addpath_tx_id = addpath_tx_id;
 398
 399         if (rn) {
 400                 RB_INSERT(bgp_adj_out_rb, &rn->adj_out, adj);
 401                 bgp_lock_node(rn);
 402                 adj->rn = rn;
 403         }
 404
 405         TAILQ_INSERT_TAIL(&(subgrp->adjq), adj, subgrp_adj_train);
 406         SUBGRP_INCR_STAT(subgrp, adj_count);
 407         return adj;
 408 }
 409
 410
 411 struct bgp_advertise *
 412 bgp_advertise_clean_subgroup(struct update_subgroup *subgrp,
 413                              struct bgp_adj_out *adj)
 414 {
 415         struct bgp_advertise *adv;
 416         struct bgp_advertise_attr *baa;
 417         struct bgp_advertise *next;
 418         struct bgp_adv_fifo_head *fhead;
 419
 420         adv = adj->adv;
 421         baa = adv->baa;
 422         next = NULL;
 423
 424         if (baa) {
 425                 fhead = &subgrp->sync->update;
 426
 427                 /* Unlink myself from advertise attribute FIFO.  */
 428                 bgp_advertise_delete(baa, adv);
 429
 430                 /* Fetch next advertise candidate. */
 431                 next = baa->adv;
 432
 433                 /* Unintern BGP advertise attribute.  */
 434                 bgp_advertise_unintern(subgrp->hash, baa);
 435         } else
 436                 fhead = &subgrp->sync->withdraw;
 437
 438
 439         /* Unlink myself from advertisement FIFO.  */
 440         bgp_adv_fifo_del(fhead, adv);
 441
 442         /* Free memory.  */
 443         bgp_advertise_free(adj->adv);
 444         adj->adv = NULL;
 445
 446         return next;
 447 }
 448
 449 void bgp_adj_out_set_subgroup(struct bgp_node *rn,
 450                               struct update_subgroup *subgrp, struct attr *attr,
 451                               struct bgp_path_info *path)
 452 {
 453         struct bgp_adj_out *adj = NULL;
 454         struct bgp_advertise *adv;
 455         struct peer *peer;
 456         afi_t afi;
 457         safi_t safi;
 458
 459         peer = SUBGRP_PEER(subgrp);
 460         afi = SUBGRP_AFI(subgrp);
 461         safi = SUBGRP_SAFI(subgrp);
 462
 463         if (DISABLE_BGP_ANNOUNCE)
 464                 return;
 465
 466         /* Look for adjacency information. */
 467         adj = adj_lookup(
 468                 rn, subgrp,
 469                 bgp_addpath_id_for_peer(peer, afi, safi, &path->tx_addpath));
 470
 471         if (!adj) {
 472                 adj = bgp_adj_out_alloc(
 473                         subgrp, rn,
 474                         bgp_addpath_id_for_peer(peer, afi, safi,
 475                                               &path->tx_addpath));
 476                 if (!adj)
 477                         return;
 478         }
 479
 480         if (adj->adv)
 481                 bgp_advertise_clean_subgroup(subgrp, adj);
 482         adj->adv = bgp_advertise_new();
 483
 484         adv = adj->adv;
 485         adv->rn = rn;
 486         assert(adv->pathi == NULL);
 487         /* bgp_path_info adj_out reference */
 488         adv->pathi = bgp_path_info_lock(path);
 489
 490         if (attr)
 491                 adv->baa = bgp_advertise_intern(subgrp->hash, attr);
 492         else
 493                 adv->baa = baa_new();
 494         adv->adj = adj;
 495
 496         /* Add new advertisement to advertisement attribute list. */
 497         bgp_advertise_add(adv->baa, adv);
 498
 499         /*
 500          * If the update adv list is empty, trigger the member peers'
 501          * mrai timers so the socket writes can happen.
 502          */
 503         if (!bgp_adv_fifo_count(&subgrp->sync->update)) {
 504                 struct peer_af *paf;
 505
 506                 SUBGRP_FOREACH_PEER (subgrp, paf) {
 507                         bgp_adjust_routeadv(PAF_PEER(paf));
 508                 }
 509         }
 510
 511         bgp_adv_fifo_add_tail(&subgrp->sync->update, adv);
 512
 513         subgrp->version = max(subgrp->version, rn->version);
 514 }
 515
 516 /* The only time 'withdraw' will be false is if we are sending
 517  * the "neighbor x.x.x.x default-originate" default and need to clear
 518  * bgp_adj_out for the 0.0.0.0/0 route in the BGP table.
 519  */
 520 void bgp_adj_out_unset_subgroup(struct bgp_node *rn,
 521                                 struct update_subgroup *subgrp, char withdraw,
 522                                 uint32_t addpath_tx_id)
 523 {
 524         struct bgp_adj_out *adj;
 525         struct bgp_advertise *adv;
 526         bool trigger_write;
 527
 528         if (DISABLE_BGP_ANNOUNCE)
 529                 return;
 530
 531         /* Lookup existing adjacency */
 532         if ((adj = adj_lookup(rn, subgrp, addpath_tx_id)) != NULL) {
 533                 /* Clean up previous advertisement.  */
 534                 if (adj->adv)
 535                         bgp_advertise_clean_subgroup(subgrp, adj);
 536
 537                 if (adj->attr && withdraw) {
 538                         /* We need advertisement structure.  */
 539                         adj->adv = bgp_advertise_new();
 540                         adv = adj->adv;
 541                         adv->rn = rn;
 542                         adv->adj = adj;
 543
 544                         /* Note if we need to trigger a packet write */
 545                         trigger_write =
 546                                 !bgp_adv_fifo_count(&subgrp->sync->withdraw);
 547
 548                         /* Add to synchronization entry for withdraw
 549                          * announcement.  */
 550                         bgp_adv_fifo_add_tail(&subgrp->sync->withdraw, adv);
 551
 552                         if (trigger_write)
 553                                 subgroup_trigger_write(subgrp);
 554                 } else {
 555                         /* Remove myself from adjacency. */
 556                         RB_REMOVE(bgp_adj_out_rb, &rn->adj_out, adj);
 557
 558                         /* Free allocated information.  */
 559                         adj_free(adj);
 560
 561                         bgp_unlock_node(rn);
 562                 }
 563         }
 564
 565         subgrp->version = max(subgrp->version, rn->version);
 566 }
 567
 568 void bgp_adj_out_remove_subgroup(struct bgp_node *rn, struct bgp_adj_out *adj,
 569                                  struct update_subgroup *subgrp)
 570 {
 571         if (adj->attr)
 572                 bgp_attr_unintern(&adj->attr);
 573
 574         if (adj->adv)
 575                 bgp_advertise_clean_subgroup(subgrp, adj);
 576
 577         RB_REMOVE(bgp_adj_out_rb, &rn->adj_out, adj);
 578         adj_free(adj);
 579 }
 580
 581 /*
 582  * Go through all the routes and clean up the adj/adv structures corresponding
 583  * to the subgroup.
 584  */
 585 void subgroup_clear_table(struct update_subgroup *subgrp)
 586 {
 587         struct bgp_adj_out *aout, *taout;
 588
 589         SUBGRP_FOREACH_ADJ_SAFE (subgrp, aout, taout) {
 590                 struct bgp_node *rn = aout->rn;
 591                 bgp_adj_out_remove_subgroup(rn, aout, subgrp);
 592                 bgp_unlock_node(rn);
 593         }
 594 }
 595
 596 /*
 597  * subgroup_announce_table
 598  */
 599 void subgroup_announce_table(struct update_subgroup *subgrp,
 600                              struct bgp_table *table)
 601 {
 602         struct bgp_node *rn;
 603         struct bgp_path_info *ri;
 604         struct attr attr;
 605         struct peer *peer;
 606         afi_t afi;
 607         safi_t safi;
 608         int addpath_capable;
 609
 610         peer = SUBGRP_PEER(subgrp);
 611         afi = SUBGRP_AFI(subgrp);
 612         safi = SUBGRP_SAFI(subgrp);
 613         addpath_capable = bgp_addpath_encode_tx(peer, afi, safi);
 614
 615         if (safi == SAFI_LABELED_UNICAST)
 616                 safi = SAFI_UNICAST;
 617
 618         if (!table)
 619                 table = peer->bgp->rib[afi][safi];
 620
 621         if (safi != SAFI_MPLS_VPN && safi != SAFI_ENCAP && safi != SAFI_EVPN
 622             && CHECK_FLAG(peer->af_flags[afi][safi],
 623                           PEER_FLAG_DEFAULT_ORIGINATE))
 624                 subgroup_default_originate(subgrp, 0);
 625
 626         for (rn = bgp_table_top(table); rn; rn = bgp_route_next(rn))
 627                 for (ri = bgp_node_get_bgp_path_info(rn); ri; ri = ri->next)
 628
 629                         if (CHECK_FLAG(ri->flags, BGP_PATH_SELECTED)
 630                             || (addpath_capable
 631                                 && bgp_addpath_tx_path(
 632                                            peer->addpath_type[afi][safi],
 633                                            ri))) {
 634                                 if (subgroup_announce_check(rn, ri, subgrp,
 635                                                             &rn->p, &attr))
 636                                         bgp_adj_out_set_subgroup(rn, subgrp,
 637                                                                  &attr, ri);
 638                                 else
 639                                         bgp_adj_out_unset_subgroup(
 640                                                 rn, subgrp, 1,
 641                                                 bgp_addpath_id_for_peer(
 642                                                         peer, afi, safi,
 643                                                         &ri->tx_addpath));
 644                         }
 645
 646         /*
 647          * We walked through the whole table -- make sure our version number
 648          * is consistent with the one on the table. This should allow
 649          * subgroups to merge sooner if a peer comes up when the route node
 650          * with the largest version is no longer in the table. This also
 651          * covers the pathological case where all routes in the table have
 652          * now been deleted.
 653          */
 654         subgrp->version = max(subgrp->version, table->version);
 655
 656         /*
 657          * Start a task to merge the subgroup if necessary.
 658          */
 659         update_subgroup_trigger_merge_check(subgrp, 0);
 660 }
 661
 662 /*
 663  * subgroup_announce_route
 664  *
 665  * Refresh all routes out to a subgroup.
 666  */
 667 void subgroup_announce_route(struct update_subgroup *subgrp)
 668 {
 669         struct bgp_node *rn;
 670         struct bgp_table *table;
 671         struct peer *onlypeer;
 672
 673         if (update_subgroup_needs_refresh(subgrp)) {
 674                 update_subgroup_set_needs_refresh(subgrp, 0);
 675         }
 676
 677         /*
 678          * First update is deferred until ORF or ROUTE-REFRESH is received
 679          */
 680         onlypeer = ((SUBGRP_PCOUNT(subgrp) == 1) ? (SUBGRP_PFIRST(subgrp))->peer
 681                                                  : NULL);
 682         if (onlypeer && CHECK_FLAG(onlypeer->af_sflags[SUBGRP_AFI(subgrp)]
 683                                                       [SUBGRP_SAFI(subgrp)],
 684                                    PEER_STATUS_ORF_WAIT_REFRESH))
 685                 return;
 686
 687         if (SUBGRP_SAFI(subgrp) != SAFI_MPLS_VPN
 688             && SUBGRP_SAFI(subgrp) != SAFI_ENCAP
 689             && SUBGRP_SAFI(subgrp) != SAFI_EVPN)
 690                 subgroup_announce_table(subgrp, NULL);
 691         else
 692                 for (rn = bgp_table_top(update_subgroup_rib(subgrp)); rn;
 693                      rn = bgp_route_next(rn)) {
 694                         table = bgp_node_get_bgp_table_info(rn);
 695                         if (!table)
 696                                 continue;
 697                         subgroup_announce_table(subgrp, table);
 698                 }
 699 }
 700
 701 void subgroup_default_originate(struct update_subgroup *subgrp, int withdraw)
 702 {
 703         struct bgp *bgp;
 704         struct attr attr;
 705         struct attr *new_attr = &attr;
 706         struct aspath *aspath;
 707         struct prefix p;
 708         struct peer *from;
 709         struct bgp_node *rn;
 710         struct peer *peer;
 711         route_map_result_t ret = RMAP_DENYMATCH;
 712         afi_t afi;
 713         safi_t safi;
 714
 715         if (!subgrp)
 716                 return;
 717
 718         peer = SUBGRP_PEER(subgrp);
 719         afi = SUBGRP_AFI(subgrp);
 720         safi = SUBGRP_SAFI(subgrp);
 721
 722         if (!(afi == AFI_IP || afi == AFI_IP6))
 723                 return;
 724
 725         bgp = peer->bgp;
 726         from = bgp->peer_self;
 727
 728         bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
 729         aspath = attr.aspath;
 730
 731         attr.local_pref = bgp->default_local_pref;
 732
 733         memset(&p, 0, sizeof(p));
 734         p.family = afi2family(afi);
 735         p.prefixlen = 0;
 736
 737         if ((afi == AFI_IP6) || peer_cap_enhe(peer, afi, safi)) {
 738                 /* IPv6 global nexthop must be included. */
 739                 attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV6_GLOBAL;
 740
 741                 /* If the peer is on shared nextwork and we have link-local
 742                    nexthop set it. */
 743                 if (peer->shared_network
 744                     && !IN6_IS_ADDR_UNSPECIFIED(&peer->nexthop.v6_local))
 745                         attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL;
 746         }
 747
 748         if (peer->default_rmap[afi][safi].name) {
 749                 struct attr attr_tmp = attr;
 750                 struct bgp_path_info bpi_rmap = {0};
 751
 752                 bpi_rmap.peer = bgp->peer_self;
 753                 bpi_rmap.attr = &attr_tmp;
 754
 755                 SET_FLAG(bgp->peer_self->rmap_type, PEER_RMAP_TYPE_DEFAULT);
 756
 757                 /* Iterate over the RIB to see if we can announce
 758                  * the default route. We announce the default
 759                  * route only if route-map has a match.
 760                  */
 761                 for (rn = bgp_table_top(bgp->rib[afi][safi]); rn;
 762                      rn = bgp_route_next(rn)) {
 763                         ret = route_map_apply(peer->default_rmap[afi][safi].map,
 764                                               &rn->p, RMAP_BGP, &bpi_rmap);
 765
 766                         if (ret != RMAP_DENYMATCH)
 767                                 break;
 768                 }
 769                 bgp->peer_self->rmap_type = 0;
 770                 new_attr = bgp_attr_intern(&attr_tmp);
 771
 772                 if (ret == RMAP_DENYMATCH) {
 773                         bgp_attr_flush(&attr_tmp);
 774                         withdraw = 1;
 775                 }
 776         }
 777
 778         if (withdraw) {
 779                 if (CHECK_FLAG(subgrp->sflags, SUBGRP_STATUS_DEFAULT_ORIGINATE))
 780                         subgroup_default_withdraw_packet(subgrp);
 781                 UNSET_FLAG(subgrp->sflags, SUBGRP_STATUS_DEFAULT_ORIGINATE);
 782         } else {
 783                 if (!CHECK_FLAG(subgrp->sflags,
 784                                 SUBGRP_STATUS_DEFAULT_ORIGINATE)) {
 785
 786                         if (CHECK_FLAG(bgp->flags, BGP_FLAG_GRACEFUL_SHUTDOWN))
 787                                 bgp_attr_add_gshut_community(new_attr);
 788
 789                         SET_FLAG(subgrp->sflags,
 790                                  SUBGRP_STATUS_DEFAULT_ORIGINATE);
 791                         subgroup_default_update_packet(subgrp, new_attr, from);
 792
 793                         /* The 'neighbor x.x.x.x default-originate' default will
 794                          * act as an
 795                          * implicit withdraw for any previous UPDATEs sent for
 796                          * 0.0.0.0/0 so
 797                          * clear adj_out for the 0.0.0.0/0 prefix in the BGP
 798                          * table.
 799                          */
 800                         memset(&p, 0, sizeof(p));
 801                         p.family = afi2family(afi);
 802                         p.prefixlen = 0;
 803
 804                         rn = bgp_afi_node_get(bgp->rib[afi][safi], afi, safi,
 805                                               &p, NULL);
 806                         bgp_adj_out_unset_subgroup(
 807                                 rn, subgrp, 0,
 808                                 BGP_ADDPATH_TX_ID_FOR_DEFAULT_ORIGINATE);
 809                 }
 810         }
 811
 812         aspath_unintern(&aspath);
 813 }
 814
 815 /*
 816  * Announce the BGP table to a subgroup.
 817  *
 818  * At startup, we try to optimize route announcement by coalescing the
 819  * peer-up events. This is done only the first time - from then on,
 820  * subgrp->v_coalesce will be set to zero and the normal logic
 821  * prevails.
 822  */
 823 void subgroup_announce_all(struct update_subgroup *subgrp)
 824 {
 825         if (!subgrp)
 826                 return;
 827
 828         /*
 829          * If coalesce timer value is not set, announce routes immediately.
 830          */
 831         if (!subgrp->v_coalesce) {
 832                 if (bgp_debug_update(NULL, NULL, subgrp->update_group, 0))
 833                         zlog_debug("u%" PRIu64 ":s%" PRIu64
 834                                    " announcing all routes",
 835                                    subgrp->update_group->id, subgrp->id);
 836                 subgroup_announce_route(subgrp);
 837                 return;
 838         }
 839
 840         /*
 841          * We should wait for the coalesce timer. Arm the timer if not done.
 842          */
 843         if (!subgrp->t_coalesce) {
 844                 thread_add_timer_msec(bm->master, subgroup_coalesce_timer,
 845                                       subgrp, subgrp->v_coalesce,
 846                                       &subgrp->t_coalesce);
 847         }
 848 }
 849
 850 /*
 851  * Go through all update subgroups and set up the adv queue for the
 852  * input route.
 853  */
 854 void group_announce_route(struct bgp *bgp, afi_t afi, safi_t safi,
 855                           struct bgp_node *rn, struct bgp_path_info *pi)
 856 {
 857         struct updwalk_context ctx;
 858         ctx.pi = pi;
 859         ctx.rn = rn;
 860         update_group_af_walk(bgp, afi, safi, group_announce_route_walkcb, &ctx);
 861 }
 862
 863 void update_group_show_adj_queue(struct bgp *bgp, afi_t afi, safi_t safi,
 864                                  struct vty *vty, uint64_t id)
 865 {
 866         updgrp_show_adj(bgp, afi, safi, vty, id, UPDWALK_FLAGS_ADVQUEUE);
 867 }
 868
 869 void update_group_show_advertised(struct bgp *bgp, afi_t afi, safi_t safi,
 870                                   struct vty *vty, uint64_t id)
 871 {
 872         updgrp_show_adj(bgp, afi, safi, vty, id, UPDWALK_FLAGS_ADVERTISED);
 873 }
 874
 875 void update_group_announce(struct bgp *bgp)
 876 {
 877         update_group_walk(bgp, update_group_announce_walkcb, NULL);
 878 }
 879
 880 void update_group_announce_rrclients(struct bgp *bgp)
 881 {
 882         update_group_walk(bgp, update_group_announce_rrc_walkcb, NULL);
 883 }