bgpd/bgp_bfd.c

   1 /**
   2  * bgp_bfd.c: BGP BFD handling routines
   3  *
   4  * @copyright Copyright (C) 2015 Cumulus Networks, Inc.
   5  *
   6  * This file is part of GNU Zebra.
   7  *
   8  * GNU Zebra is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2, or (at your option) any
  11  * later version.
  12  *
  13  * GNU Zebra is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; see the file COPYING; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include <zebra.h>
  24
  25 #include "command.h"
  26 #include "linklist.h"
  27 #include "memory.h"
  28 #include "prefix.h"
  29 #include "thread.h"
  30 #include "buffer.h"
  31 #include "stream.h"
  32 #include "zclient.h"
  33 #include "bfd.h"
  34 #include "lib/json.h"
  35 #include "filter.h"
  36
  37 #include "bgpd/bgpd.h"
  38 #include "bgp_fsm.h"
  39 #include "bgpd/bgp_bfd.h"
  40 #include "bgpd/bgp_debug.h"
  41 #include "bgpd/bgp_vty.h"
  42
  43 extern struct zclient *zclient;
  44
  45 /*
  46  * bgp_bfd_peer_group2peer_copy - Copy the BFD information from peer group
  47  * template
  48  *                                to peer.
  49  */
  50 void bgp_bfd_peer_group2peer_copy(struct peer *conf, struct peer *peer)
  51 {
  52         struct bfd_info *bfd_info;
  53         struct bfd_info *conf_bfd_info;
  54
  55         if (!conf->bfd_info)
  56                 return;
  57
  58         conf_bfd_info = (struct bfd_info *)conf->bfd_info;
  59         if (!peer->bfd_info)
  60                 peer->bfd_info = bfd_info_create();
  61
  62         bfd_info = (struct bfd_info *)peer->bfd_info;
  63
  64         /* Copy BFD parameter values */
  65         bfd_info->required_min_rx = conf_bfd_info->required_min_rx;
  66         bfd_info->desired_min_tx = conf_bfd_info->desired_min_tx;
  67         bfd_info->detect_mult = conf_bfd_info->detect_mult;
  68         bfd_info->type = conf_bfd_info->type;
  69 }
  70
  71 /*
  72  * bgp_bfd_is_peer_multihop - returns whether BFD peer is multi-hop or single
  73  * hop.
  74  */
  75 int bgp_bfd_is_peer_multihop(struct peer *peer)
  76 {
  77         struct bfd_info *bfd_info;
  78
  79         bfd_info = (struct bfd_info *)peer->bfd_info;
  80
  81         if (!bfd_info)
  82                 return 0;
  83
  84         if ((bfd_info->type == BFD_TYPE_MULTIHOP)
  85             || ((peer->sort == BGP_PEER_IBGP) && !peer->shared_network)
  86             || is_ebgp_multihop_configured(peer))
  87                 return 1;
  88         else
  89                 return 0;
  90 }
  91
  92 /*
  93  * bgp_bfd_peer_sendmsg - Format and send a Peer register/Unregister
  94  *                        command to Zebra to be forwarded to BFD
  95  */
  96 static void bgp_bfd_peer_sendmsg(struct peer *peer, int command)
  97 {
  98         struct bfd_info *bfd_info;
  99         vrf_id_t vrf_id = VRF_DEFAULT;
 100         int multihop;
 101
 102         bfd_info = (struct bfd_info *)peer->bfd_info;
 103
 104         if (peer->bgp->inst_type == BGP_INSTANCE_TYPE_VRF)
 105                 vrf_id = peer->bgp->vrf_id;
 106
 107         if (command == ZEBRA_BFD_DEST_DEREGISTER) {
 108                 multihop =
 109                         CHECK_FLAG(bfd_info->flags, BFD_FLAG_BFD_TYPE_MULTIHOP);
 110                 UNSET_FLAG(bfd_info->flags, BFD_FLAG_BFD_TYPE_MULTIHOP);
 111         } else {
 112                 multihop = bgp_bfd_is_peer_multihop(peer);
 113                 if ((command == ZEBRA_BFD_DEST_REGISTER) && multihop)
 114                         SET_FLAG(bfd_info->flags, BFD_FLAG_BFD_TYPE_MULTIHOP);
 115         }
 116
 117         if (peer->su.sa.sa_family == AF_INET)
 118                 bfd_peer_sendmsg(
 119                         zclient, bfd_info, AF_INET, &peer->su.sin.sin_addr,
 120                         (peer->su_local) ? &peer->su_local->sin.sin_addr : NULL,
 121                         (peer->nexthop.ifp) ? peer->nexthop.ifp->name : NULL,
 122                         peer->ttl, multihop, command, 1, vrf_id);
 123         else if (peer->su.sa.sa_family == AF_INET6)
 124                 bfd_peer_sendmsg(
 125                         zclient, bfd_info, AF_INET6, &peer->su.sin6.sin6_addr,
 126                         (peer->su_local) ? &peer->su_local->sin6.sin6_addr
 127                                          : NULL,
 128                         (peer->nexthop.ifp) ? peer->nexthop.ifp->name : NULL,
 129                         peer->ttl, multihop, command, 1, vrf_id);
 130 }
 131
 132 /*
 133  * bgp_bfd_register_peer - register a peer with BFD through zebra
 134  *                         for monitoring the peer rechahability.
 135  */
 136 void bgp_bfd_register_peer(struct peer *peer)
 137 {
 138         struct bfd_info *bfd_info;
 139
 140         if (!peer->bfd_info)
 141                 return;
 142         bfd_info = (struct bfd_info *)peer->bfd_info;
 143
 144         /* Check if BFD is enabled and peer has already been registered with BFD
 145          */
 146         if (CHECK_FLAG(bfd_info->flags, BFD_FLAG_BFD_REG))
 147                 return;
 148
 149         bgp_bfd_peer_sendmsg(peer, ZEBRA_BFD_DEST_REGISTER);
 150 }
 151
 152 /**
 153  * bgp_bfd_deregister_peer - deregister a peer with BFD through zebra
 154  *                           for stopping the monitoring of the peer
 155  *                           rechahability.
 156  */
 157 void bgp_bfd_deregister_peer(struct peer *peer)
 158 {
 159         struct bfd_info *bfd_info;
 160
 161         if (!peer->bfd_info)
 162                 return;
 163         bfd_info = (struct bfd_info *)peer->bfd_info;
 164
 165         /* Check if BFD is eanbled and peer has not been registered */
 166         if (!CHECK_FLAG(bfd_info->flags, BFD_FLAG_BFD_REG))
 167                 return;
 168
 169         bfd_info->status = BFD_STATUS_DOWN;
 170         bfd_info->last_update = bgp_clock();
 171
 172         bgp_bfd_peer_sendmsg(peer, ZEBRA_BFD_DEST_DEREGISTER);
 173 }
 174
 175 /*
 176  * bgp_bfd_update_peer - update peer with BFD with new BFD paramters
 177  *                       through zebra.
 178  */
 179 static void bgp_bfd_update_peer(struct peer *peer)
 180 {
 181         struct bfd_info *bfd_info;
 182
 183         if (!peer->bfd_info)
 184                 return;
 185         bfd_info = (struct bfd_info *)peer->bfd_info;
 186
 187         /* Check if the peer has been registered with BFD*/
 188         if (!CHECK_FLAG(bfd_info->flags, BFD_FLAG_BFD_REG))
 189                 return;
 190
 191         bgp_bfd_peer_sendmsg(peer, ZEBRA_BFD_DEST_UPDATE);
 192 }
 193
 194 /*
 195  * bgp_bfd_update_type - update session type with BFD through zebra.
 196  */
 197 static void bgp_bfd_update_type(struct peer *peer)
 198 {
 199         struct bfd_info *bfd_info;
 200         int multihop;
 201
 202         if (!peer->bfd_info)
 203                 return;
 204         bfd_info = (struct bfd_info *)peer->bfd_info;
 205
 206         /* Check if the peer has been registered with BFD*/
 207         if (!CHECK_FLAG(bfd_info->flags, BFD_FLAG_BFD_REG))
 208                 return;
 209
 210         if (bfd_info->type == BFD_TYPE_NOT_CONFIGURED) {
 211                 multihop = bgp_bfd_is_peer_multihop(peer);
 212                 if ((multihop
 213                      && !CHECK_FLAG(bfd_info->flags,
 214                                     BFD_FLAG_BFD_TYPE_MULTIHOP))
 215                     || (!multihop && CHECK_FLAG(bfd_info->flags,
 216                                                 BFD_FLAG_BFD_TYPE_MULTIHOP))) {
 217                         bgp_bfd_peer_sendmsg(peer, ZEBRA_BFD_DEST_DEREGISTER);
 218                         bgp_bfd_peer_sendmsg(peer, ZEBRA_BFD_DEST_REGISTER);
 219                 }
 220         } else {
 221                 if ((bfd_info->type == BFD_TYPE_MULTIHOP
 222                      && !CHECK_FLAG(bfd_info->flags,
 223                                     BFD_FLAG_BFD_TYPE_MULTIHOP))
 224                     || (bfd_info->type == BFD_TYPE_SINGLEHOP
 225                         && CHECK_FLAG(bfd_info->flags,
 226                                       BFD_FLAG_BFD_TYPE_MULTIHOP))) {
 227                         bgp_bfd_peer_sendmsg(peer, ZEBRA_BFD_DEST_DEREGISTER);
 228                         bgp_bfd_peer_sendmsg(peer, ZEBRA_BFD_DEST_REGISTER);
 229                 }
 230         }
 231 }
 232
 233 /*
 234  * bgp_bfd_dest_replay - Replay all the peers that have BFD enabled
 235  *                       to zebra
 236  */
 237 static int bgp_bfd_dest_replay(ZAPI_CALLBACK_ARGS)
 238 {
 239         struct listnode *mnode, *node, *nnode;
 240         struct bgp *bgp;
 241         struct peer *peer;
 242
 243         if (BGP_DEBUG(zebra, ZEBRA))
 244                 zlog_debug("Zebra: BFD Dest replay request");
 245
 246         /* Send the client registration */
 247         bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER);
 248
 249         /* Replay the peer, if BFD is enabled in BGP */
 250
 251         for (ALL_LIST_ELEMENTS_RO(bm->bgp, mnode, bgp))
 252                 for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
 253                         bgp_bfd_update_peer(peer);
 254                 }
 255
 256         return 0;
 257 }
 258
 259 /*
 260  * bgp_bfd_peer_status_update - Update the BFD status if it has changed. Bring
 261  *                              down the peer if the BFD session went down from
 262  * *                              up.
 263  */
 264 static void bgp_bfd_peer_status_update(struct peer *peer, int status)
 265 {
 266         struct bfd_info *bfd_info;
 267         int old_status;
 268
 269         bfd_info = (struct bfd_info *)peer->bfd_info;
 270
 271         if (bfd_info->status == status)
 272                 return;
 273
 274         old_status = bfd_info->status;
 275         bfd_info->status = status;
 276         bfd_info->last_update = bgp_clock();
 277
 278         if (status != old_status) {
 279                 if (BGP_DEBUG(neighbor_events, NEIGHBOR_EVENTS))
 280                         zlog_debug("[%s]: BFD %s", peer->host,
 281                                    bfd_get_status_str(status));
 282         }
 283         if ((status == BFD_STATUS_DOWN) && (old_status == BFD_STATUS_UP)) {
 284                 peer->last_reset = PEER_DOWN_BFD_DOWN;
 285                 BGP_EVENT_ADD(peer, BGP_Stop);
 286         }
 287         if ((status == BFD_STATUS_UP) && (old_status == BFD_STATUS_DOWN)
 288             && peer->status != Established) {
 289                 if (!BGP_PEER_START_SUPPRESSED(peer)) {
 290                         bgp_fsm_event_update(peer, 1);
 291                         BGP_EVENT_ADD(peer, BGP_Start);
 292                 }
 293         }
 294 }
 295
 296 /*
 297  * bgp_bfd_dest_update - Find the peer for which the BFD status
 298  *                       has changed and bring down the peer
 299  *                       connectivity if the BFD session went down.
 300  */
 301 static int bgp_bfd_dest_update(ZAPI_CALLBACK_ARGS)
 302 {
 303         struct interface *ifp;
 304         struct prefix dp;
 305         struct prefix sp;
 306         int status;
 307
 308         ifp = bfd_get_peer_info(zclient->ibuf, &dp, &sp, &status, vrf_id);
 309
 310         if (BGP_DEBUG(zebra, ZEBRA)) {
 311                 char buf[2][PREFIX2STR_BUFFER];
 312                 prefix2str(&dp, buf[0], sizeof(buf[0]));
 313                 if (ifp) {
 314                         zlog_debug(
 315                                 "Zebra: vrf %u interface %s bfd destination %s %s",
 316                                 vrf_id, ifp->name, buf[0],
 317                                 bfd_get_status_str(status));
 318                 } else {
 319                         prefix2str(&sp, buf[1], sizeof(buf[1]));
 320                         zlog_debug(
 321                                 "Zebra: vrf %u source %s bfd destination %s %s",
 322                                 vrf_id, buf[1], buf[0],
 323                                 bfd_get_status_str(status));
 324                 }
 325         }
 326
 327         /* Bring the peer down if BFD is enabled in BGP */
 328         {
 329                 struct listnode *mnode, *node, *nnode;
 330                 struct bgp *bgp;
 331                 struct peer *peer;
 332
 333                 for (ALL_LIST_ELEMENTS_RO(bm->bgp, mnode, bgp))
 334                         for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
 335                                 if (!peer->bfd_info)
 336                                         continue;
 337
 338                                 if ((dp.family == AF_INET)
 339                                     && (peer->su.sa.sa_family == AF_INET)) {
 340                                         if (dp.u.prefix4.s_addr
 341                                             != peer->su.sin.sin_addr.s_addr)
 342                                                 continue;
 343                                 } else if ((dp.family == AF_INET6)
 344                                            && (peer->su.sa.sa_family
 345                                                == AF_INET6)) {
 346                                         if (memcmp(&dp.u.prefix6,
 347                                                    &peer->su.sin6.sin6_addr,
 348                                                    sizeof(struct in6_addr)))
 349                                                 continue;
 350                                 } else
 351                                         continue;
 352
 353                                 if (ifp && (ifp == peer->nexthop.ifp)) {
 354                                         bgp_bfd_peer_status_update(peer,
 355                                                                    status);
 356                                 } else {
 357                                         if (!peer->su_local)
 358                                                 continue;
 359
 360                                         if ((sp.family == AF_INET)
 361                                             && (peer->su_local->sa.sa_family
 362                                                 == AF_INET)) {
 363                                                 if (sp.u.prefix4.s_addr
 364                                                     != peer->su_local->sin
 365                                                                .sin_addr.s_addr)
 366                                                         continue;
 367                                         } else if ((sp.family == AF_INET6)
 368                                                    && (peer->su_local->sa
 369                                                                .sa_family
 370                                                        == AF_INET6)) {
 371                                                 if (memcmp(&sp.u.prefix6,
 372                                                            &peer->su_local->sin6
 373                                                                     .sin6_addr,
 374                                                            sizeof(struct
 375                                                                   in6_addr)))
 376                                                         continue;
 377                                         } else
 378                                                 continue;
 379
 380                                         if ((vrf_id != VRF_DEFAULT)
 381                                             && (peer->bgp->vrf_id != vrf_id))
 382                                                 continue;
 383
 384                                         bgp_bfd_peer_status_update(peer,
 385                                                                    status);
 386                                 }
 387                         }
 388         }
 389
 390         return 0;
 391 }
 392
 393 /*
 394  * bgp_bfd_peer_param_set - Set the configured BFD paramter values for peer.
 395  */
 396 static int bgp_bfd_peer_param_set(struct peer *peer, uint32_t min_rx,
 397                                   uint32_t min_tx, uint8_t detect_mult,
 398                                   int defaults)
 399 {
 400         struct peer_group *group;
 401         struct listnode *node, *nnode;
 402         int command = 0;
 403
 404         bfd_set_param((struct bfd_info **)&(peer->bfd_info), min_rx, min_tx,
 405                       detect_mult, defaults, &command);
 406
 407         if (CHECK_FLAG(peer->sflags, PEER_STATUS_GROUP)) {
 408                 group = peer->group;
 409                 for (ALL_LIST_ELEMENTS(group->peer, node, nnode, peer)) {
 410                         command = 0;
 411                         bfd_set_param((struct bfd_info **)&(peer->bfd_info),
 412                                       min_rx, min_tx, detect_mult, defaults,
 413                                       &command);
 414
 415                         if ((peer->status == Established)
 416                             && (command == ZEBRA_BFD_DEST_REGISTER))
 417                                 bgp_bfd_register_peer(peer);
 418                         else if (command == ZEBRA_BFD_DEST_UPDATE)
 419                                 bgp_bfd_update_peer(peer);
 420                 }
 421         } else {
 422                 if ((peer->status == Established)
 423                     && (command == ZEBRA_BFD_DEST_REGISTER))
 424                         bgp_bfd_register_peer(peer);
 425                 else if (command == ZEBRA_BFD_DEST_UPDATE)
 426                         bgp_bfd_update_peer(peer);
 427         }
 428         return 0;
 429 }
 430
 431 /*
 432  * bgp_bfd_peer_param_unset - Delete the configured BFD paramter values for
 433  * peer.
 434  */
 435 static int bgp_bfd_peer_param_unset(struct peer *peer)
 436 {
 437         struct peer_group *group;
 438         struct listnode *node, *nnode;
 439
 440         if (!peer->bfd_info)
 441                 return 0;
 442
 443         if (CHECK_FLAG(peer->sflags, PEER_STATUS_GROUP)) {
 444                 bfd_info_free(&(peer->bfd_info));
 445                 group = peer->group;
 446                 for (ALL_LIST_ELEMENTS(group->peer, node, nnode, peer)) {
 447                         bgp_bfd_deregister_peer(peer);
 448                         bfd_info_free(&(peer->bfd_info));
 449                 }
 450         } else {
 451                 bgp_bfd_deregister_peer(peer);
 452                 bfd_info_free(&(peer->bfd_info));
 453         }
 454         return 0;
 455 }
 456
 457 /*
 458  * bgp_bfd_peer_param_type_set - set the BFD session type (multihop or
 459  * singlehop)
 460  */
 461 static int bgp_bfd_peer_param_type_set(struct peer *peer,
 462                                        enum bfd_sess_type type)
 463 {
 464         struct peer_group *group;
 465         struct listnode *node, *nnode;
 466         int command = 0;
 467         struct bfd_info *bfd_info;
 468
 469         if (!peer->bfd_info)
 470                 bfd_set_param((struct bfd_info **)&(peer->bfd_info),
 471                               BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
 472                               BFD_DEF_DETECT_MULT, 1, &command);
 473
 474         bfd_info = (struct bfd_info *)peer->bfd_info;
 475         bfd_info->type = type;
 476
 477         if (CHECK_FLAG(peer->sflags, PEER_STATUS_GROUP)) {
 478                 group = peer->group;
 479                 for (ALL_LIST_ELEMENTS(group->peer, node, nnode, peer)) {
 480                         command = 0;
 481                         if (!peer->bfd_info)
 482                                 bfd_set_param(
 483                                         (struct bfd_info **)&(peer->bfd_info),
 484                                         BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
 485                                         BFD_DEF_DETECT_MULT, 1, &command);
 486
 487                         bfd_info = (struct bfd_info *)peer->bfd_info;
 488                         bfd_info->type = type;
 489
 490                         if (peer->status == Established) {
 491                                 if (command == ZEBRA_BFD_DEST_REGISTER)
 492                                         bgp_bfd_register_peer(peer);
 493                                 else
 494                                         bgp_bfd_update_type(peer);
 495                         }
 496                 }
 497         } else {
 498                 if (peer->status == Established) {
 499                         if (command == ZEBRA_BFD_DEST_REGISTER)
 500                                 bgp_bfd_register_peer(peer);
 501                         else
 502                                 bgp_bfd_update_type(peer);
 503                 }
 504         }
 505
 506         return 0;
 507 }
 508
 509 /*
 510  * bgp_bfd_peer_config_write - Write the peer BFD configuration.
 511  */
 512 void bgp_bfd_peer_config_write(struct vty *vty, struct peer *peer, char *addr)
 513 {
 514         struct bfd_info *bfd_info;
 515
 516         if (!peer->bfd_info)
 517                 return;
 518
 519         bfd_info = (struct bfd_info *)peer->bfd_info;
 520
 521         if (CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG))
 522 #if HAVE_BFDD > 0
 523                 vty_out(vty, " neighbor %s bfd\n", addr);
 524 #else
 525                 vty_out(vty, " neighbor %s bfd %d %d %d\n", addr,
 526                         bfd_info->detect_mult, bfd_info->required_min_rx,
 527                         bfd_info->desired_min_tx);
 528 #endif /* HAVE_BFDD */
 529
 530         if (bfd_info->type != BFD_TYPE_NOT_CONFIGURED)
 531                 vty_out(vty, " neighbor %s bfd %s\n", addr,
 532                         (bfd_info->type == BFD_TYPE_MULTIHOP) ? "multihop"
 533                                                               : "singlehop");
 534
 535         if (!CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG)
 536             && (bfd_info->type == BFD_TYPE_NOT_CONFIGURED))
 537                 vty_out(vty, " neighbor %s bfd\n", addr);
 538 }
 539
 540 /*
 541  * bgp_bfd_show_info - Show the peer BFD information.
 542  */
 543 void bgp_bfd_show_info(struct vty *vty, struct peer *peer, bool use_json,
 544                        json_object *json_neigh)
 545 {
 546         bfd_show_info(vty, (struct bfd_info *)peer->bfd_info,
 547                       bgp_bfd_is_peer_multihop(peer), 0, use_json, json_neigh);
 548 }
 549
 550 DEFUN (neighbor_bfd,
 551        neighbor_bfd_cmd,
 552        "neighbor <A.B.C.D|X:X::X:X|WORD> bfd",
 553        NEIGHBOR_STR
 554        NEIGHBOR_ADDR_STR2
 555        "Enables BFD support\n")
 556 {
 557         int idx_peer = 1;
 558         struct peer *peer;
 559         int ret;
 560
 561         peer = peer_and_group_lookup_vty(vty, argv[idx_peer]->arg);
 562         if (!peer)
 563                 return CMD_WARNING_CONFIG_FAILED;
 564
 565         ret = bgp_bfd_peer_param_set(peer, BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
 566                                      BFD_DEF_DETECT_MULT, 1);
 567         if (ret != 0)
 568                 return bgp_vty_return(vty, ret);
 569
 570         return CMD_SUCCESS;
 571 }
 572
 573 #if HAVE_BFDD > 0
 574 DEFUN_HIDDEN(
 575 #else
 576 DEFUN(
 577 #endif /* HAVE_BFDD */
 578        neighbor_bfd_param,
 579        neighbor_bfd_param_cmd,
 580        "neighbor <A.B.C.D|X:X::X:X|WORD> bfd (2-255) (50-60000) (50-60000)",
 581        NEIGHBOR_STR
 582        NEIGHBOR_ADDR_STR2
 583        "Enables BFD support\n"
 584        "Detect Multiplier\n"
 585        "Required min receive interval\n"
 586        "Desired min transmit interval\n")
 587 {
 588         int idx_peer = 1;
 589         int idx_number_1 = 3;
 590         int idx_number_2 = 4;
 591         int idx_number_3 = 5;
 592         struct peer *peer;
 593         uint32_t rx_val;
 594         uint32_t tx_val;
 595         uint8_t dm_val;
 596         int ret;
 597
 598         peer = peer_and_group_lookup_vty(vty, argv[idx_peer]->arg);
 599         if (!peer)
 600                 return CMD_WARNING_CONFIG_FAILED;
 601
 602         if ((ret = bfd_validate_param(
 603                      vty, argv[idx_number_1]->arg, argv[idx_number_2]->arg,
 604                      argv[idx_number_3]->arg, &dm_val, &rx_val, &tx_val))
 605             != CMD_SUCCESS)
 606                 return ret;
 607
 608         ret = bgp_bfd_peer_param_set(peer, rx_val, tx_val, dm_val, 0);
 609         if (ret != 0)
 610                 return bgp_vty_return(vty, ret);
 611
 612         return CMD_SUCCESS;
 613 }
 614
 615 DEFUN_HIDDEN (neighbor_bfd_type,
 616        neighbor_bfd_type_cmd,
 617        "neighbor <A.B.C.D|X:X::X:X|WORD> bfd <multihop|singlehop>",
 618        NEIGHBOR_STR
 619        NEIGHBOR_ADDR_STR2
 620        "Enables BFD support\n"
 621        "Multihop session\n"
 622        "Single hop session\n")
 623 {
 624         int idx_peer = 1;
 625         int idx_hop = 3;
 626         struct peer *peer;
 627         enum bfd_sess_type type;
 628         int ret;
 629
 630         peer = peer_and_group_lookup_vty(vty, argv[idx_peer]->arg);
 631         if (!peer)
 632                 return CMD_WARNING_CONFIG_FAILED;
 633
 634         if (strmatch(argv[idx_hop]->text, "singlehop"))
 635                 type = BFD_TYPE_SINGLEHOP;
 636         else if (strmatch(argv[idx_hop]->text, "multihop"))
 637                 type = BFD_TYPE_MULTIHOP;
 638         else
 639                 return CMD_WARNING_CONFIG_FAILED;
 640
 641         ret = bgp_bfd_peer_param_type_set(peer, type);
 642         if (ret != 0)
 643                 return bgp_vty_return(vty, ret);
 644
 645         return CMD_SUCCESS;
 646 }
 647
 648 DEFUN (no_neighbor_bfd,
 649        no_neighbor_bfd_cmd,
 650 #if HAVE_BFDD > 0
 651        "no neighbor <A.B.C.D|X:X::X:X|WORD> bfd",
 652 #else
 653        "no neighbor <A.B.C.D|X:X::X:X|WORD> bfd [(2-255) (50-60000) (50-60000)]",
 654 #endif /* HAVE_BFDD */
 655        NO_STR
 656        NEIGHBOR_STR
 657        NEIGHBOR_ADDR_STR2
 658        "Disables BFD support\n"
 659 #if HAVE_BFDD == 0
 660        "Detect Multiplier\n"
 661        "Required min receive interval\n"
 662        "Desired min transmit interval\n"
 663 #endif /* !HAVE_BFDD */
 664 )
 665 {
 666         int idx_peer = 2;
 667         struct peer *peer;
 668         int ret;
 669
 670         peer = peer_and_group_lookup_vty(vty, argv[idx_peer]->arg);
 671         if (!peer)
 672                 return CMD_WARNING_CONFIG_FAILED;
 673
 674         ret = bgp_bfd_peer_param_unset(peer);
 675         if (ret != 0)
 676                 return bgp_vty_return(vty, ret);
 677
 678         return CMD_SUCCESS;
 679 }
 680
 681
 682 DEFUN_HIDDEN (no_neighbor_bfd_type,
 683        no_neighbor_bfd_type_cmd,
 684        "no neighbor <A.B.C.D|X:X::X:X|WORD> bfd <multihop|singlehop>",
 685        NO_STR
 686        NEIGHBOR_STR
 687        NEIGHBOR_ADDR_STR2
 688        "Disables BFD support\n"
 689        "Multihop session\n"
 690        "Singlehop session\n")
 691 {
 692         int idx_peer = 2;
 693         struct peer *peer;
 694         int ret;
 695
 696         peer = peer_and_group_lookup_vty(vty, argv[idx_peer]->arg);
 697         if (!peer)
 698                 return CMD_WARNING_CONFIG_FAILED;
 699
 700         if (!peer->bfd_info)
 701                 return 0;
 702
 703         ret = bgp_bfd_peer_param_type_set(peer, BFD_TYPE_NOT_CONFIGURED);
 704         if (ret != 0)
 705                 return bgp_vty_return(vty, ret);
 706
 707         return CMD_SUCCESS;
 708 }
 709
 710 void bgp_bfd_init(void)
 711 {
 712         bfd_gbl_init();
 713
 714         /* Initialize BFD client functions */
 715         zclient->interface_bfd_dest_update = bgp_bfd_dest_update;
 716         zclient->bfd_dest_replay = bgp_bfd_dest_replay;
 717
 718         /* "neighbor bfd" commands. */
 719         install_element(BGP_NODE, &neighbor_bfd_cmd);
 720         install_element(BGP_NODE, &neighbor_bfd_param_cmd);
 721         install_element(BGP_NODE, &neighbor_bfd_type_cmd);
 722         install_element(BGP_NODE, &no_neighbor_bfd_cmd);
 723         install_element(BGP_NODE, &no_neighbor_bfd_type_cmd);
 724 }