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(int command, struct zclient *client,
 238                                zebra_size_t length, vrf_id_t vrf_id)
 239 {
 240         struct listnode *mnode, *node, *nnode;
 241         struct bgp *bgp;
 242         struct peer *peer;
 243
 244         if (BGP_DEBUG(zebra, ZEBRA))
 245                 zlog_debug("Zebra: BFD Dest replay request");
 246
 247         /* Send the client registration */
 248         bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER);
 249
 250         /* Replay the peer, if BFD is enabled in BGP */
 251
 252         for (ALL_LIST_ELEMENTS_RO(bm->bgp, mnode, bgp))
 253                 for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
 254                         bgp_bfd_update_peer(peer);
 255                 }
 256
 257         return 0;
 258 }
 259
 260 /*
 261  * bgp_bfd_peer_status_update - Update the BFD status if it has changed. Bring
 262  *                              down the peer if the BFD session went down from
 263  * *                              up.
 264  */
 265 static void bgp_bfd_peer_status_update(struct peer *peer, int status)
 266 {
 267         struct bfd_info *bfd_info;
 268         int old_status;
 269
 270         bfd_info = (struct bfd_info *)peer->bfd_info;
 271
 272         if (bfd_info->status == status)
 273                 return;
 274
 275         old_status = bfd_info->status;
 276         bfd_info->status = status;
 277         bfd_info->last_update = bgp_clock();
 278
 279         if ((status == BFD_STATUS_DOWN) && (old_status == BFD_STATUS_UP)) {
 280                 peer->last_reset = PEER_DOWN_BFD_DOWN;
 281                 BGP_EVENT_ADD(peer, BGP_Stop);
 282         }
 283         if ((status == BFD_STATUS_UP) && (old_status == BFD_STATUS_DOWN)
 284             && peer->status != Established) {
 285                 if (!BGP_PEER_START_SUPPRESSED(peer))
 286                         BGP_EVENT_ADD(peer, BGP_Start);
 287         }
 288 }
 289
 290 /*
 291  * bgp_bfd_dest_update - Find the peer for which the BFD status
 292  *                       has changed and bring down the peer
 293  *                       connectivity if the BFD session went down.
 294  */
 295 static int bgp_bfd_dest_update(int command, struct zclient *zclient,
 296                                zebra_size_t length, vrf_id_t vrf_id)
 297 {
 298         struct interface *ifp;
 299         struct prefix dp;
 300         struct prefix sp;
 301         int status;
 302
 303         ifp = bfd_get_peer_info(zclient->ibuf, &dp, &sp, &status, vrf_id);
 304
 305         if (BGP_DEBUG(zebra, ZEBRA)) {
 306                 char buf[2][PREFIX2STR_BUFFER];
 307                 prefix2str(&dp, buf[0], sizeof(buf[0]));
 308                 if (ifp) {
 309                         zlog_debug(
 310                                 "Zebra: vrf %u interface %s bfd destination %s %s",
 311                                 vrf_id, ifp->name, buf[0],
 312                                 bfd_get_status_str(status));
 313                 } else {
 314                         prefix2str(&sp, buf[1], sizeof(buf[1]));
 315                         zlog_debug(
 316                                 "Zebra: vrf %u source %s bfd destination %s %s",
 317                                 vrf_id, buf[1], buf[0],
 318                                 bfd_get_status_str(status));
 319                 }
 320         }
 321
 322         /* Bring the peer down if BFD is enabled in BGP */
 323         {
 324                 struct listnode *mnode, *node, *nnode;
 325                 struct bgp *bgp;
 326                 struct peer *peer;
 327
 328                 for (ALL_LIST_ELEMENTS_RO(bm->bgp, mnode, bgp))
 329                         for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
 330                                 if (!peer->bfd_info)
 331                                         continue;
 332
 333                                 if ((dp.family == AF_INET)
 334                                     && (peer->su.sa.sa_family == AF_INET)) {
 335                                         if (dp.u.prefix4.s_addr
 336                                             != peer->su.sin.sin_addr.s_addr)
 337                                                 continue;
 338                                 } else if ((dp.family == AF_INET6)
 339                                            && (peer->su.sa.sa_family
 340                                                == AF_INET6)) {
 341                                         if (memcmp(&dp.u.prefix6,
 342                                                    &peer->su.sin6.sin6_addr,
 343                                                    sizeof(struct in6_addr)))
 344                                                 continue;
 345                                 } else
 346                                         continue;
 347
 348                                 if (ifp && (ifp == peer->nexthop.ifp)) {
 349                                         bgp_bfd_peer_status_update(peer,
 350                                                                    status);
 351                                 } else {
 352                                         if (!peer->su_local)
 353                                                 continue;
 354
 355                                         if ((sp.family == AF_INET)
 356                                             && (peer->su_local->sa.sa_family
 357                                                 == AF_INET)) {
 358                                                 if (sp.u.prefix4.s_addr
 359                                                     != peer->su_local->sin
 360                                                                .sin_addr.s_addr)
 361                                                         continue;
 362                                         } else if ((sp.family == AF_INET6)
 363                                                    && (peer->su_local->sa
 364                                                                .sa_family
 365                                                        == AF_INET6)) {
 366                                                 if (memcmp(&sp.u.prefix6,
 367                                                            &peer->su_local->sin6
 368                                                                     .sin6_addr,
 369                                                            sizeof(struct
 370                                                                   in6_addr)))
 371                                                         continue;
 372                                         } else
 373                                                 continue;
 374
 375                                         if ((vrf_id != VRF_DEFAULT)
 376                                             && (peer->bgp->vrf_id != vrf_id))
 377                                                 continue;
 378
 379                                         bgp_bfd_peer_status_update(peer,
 380                                                                    status);
 381                                 }
 382                         }
 383         }
 384
 385         return 0;
 386 }
 387
 388 /*
 389  * bgp_bfd_peer_param_set - Set the configured BFD paramter values for peer.
 390  */
 391 static int bgp_bfd_peer_param_set(struct peer *peer, uint32_t min_rx,
 392                                   uint32_t min_tx, uint8_t detect_mult,
 393                                   int defaults)
 394 {
 395         struct peer_group *group;
 396         struct listnode *node, *nnode;
 397         int command = 0;
 398
 399         bfd_set_param((struct bfd_info **)&(peer->bfd_info), min_rx, min_tx,
 400                       detect_mult, defaults, &command);
 401
 402         if (CHECK_FLAG(peer->sflags, PEER_STATUS_GROUP)) {
 403                 group = peer->group;
 404                 for (ALL_LIST_ELEMENTS(group->peer, node, nnode, peer)) {
 405                         command = 0;
 406                         bfd_set_param((struct bfd_info **)&(peer->bfd_info),
 407                                       min_rx, min_tx, detect_mult, defaults,
 408                                       &command);
 409
 410                         if ((peer->status == Established)
 411                             && (command == ZEBRA_BFD_DEST_REGISTER))
 412                                 bgp_bfd_register_peer(peer);
 413                         else if (command == ZEBRA_BFD_DEST_UPDATE)
 414                                 bgp_bfd_update_peer(peer);
 415                 }
 416         } else {
 417                 if ((peer->status == Established)
 418                     && (command == ZEBRA_BFD_DEST_REGISTER))
 419                         bgp_bfd_register_peer(peer);
 420                 else if (command == ZEBRA_BFD_DEST_UPDATE)
 421                         bgp_bfd_update_peer(peer);
 422         }
 423         return 0;
 424 }
 425
 426 /*
 427  * bgp_bfd_peer_param_unset - Delete the configured BFD paramter values for
 428  * peer.
 429  */
 430 static int bgp_bfd_peer_param_unset(struct peer *peer)
 431 {
 432         struct peer_group *group;
 433         struct listnode *node, *nnode;
 434
 435         if (!peer->bfd_info)
 436                 return 0;
 437
 438         if (CHECK_FLAG(peer->sflags, PEER_STATUS_GROUP)) {
 439                 bfd_info_free(&(peer->bfd_info));
 440                 group = peer->group;
 441                 for (ALL_LIST_ELEMENTS(group->peer, node, nnode, peer)) {
 442                         bgp_bfd_deregister_peer(peer);
 443                         bfd_info_free(&(peer->bfd_info));
 444                 }
 445         } else {
 446                 bgp_bfd_deregister_peer(peer);
 447                 bfd_info_free(&(peer->bfd_info));
 448         }
 449         return 0;
 450 }
 451
 452 /*
 453  * bgp_bfd_peer_param_type_set - set the BFD session type (multihop or
 454  * singlehop)
 455  */
 456 static int bgp_bfd_peer_param_type_set(struct peer *peer,
 457                                        enum bfd_sess_type type)
 458 {
 459         struct peer_group *group;
 460         struct listnode *node, *nnode;
 461         int command = 0;
 462         struct bfd_info *bfd_info;
 463
 464         if (!peer->bfd_info)
 465                 bfd_set_param((struct bfd_info **)&(peer->bfd_info),
 466                               BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
 467                               BFD_DEF_DETECT_MULT, 1, &command);
 468
 469         bfd_info = (struct bfd_info *)peer->bfd_info;
 470         bfd_info->type = type;
 471
 472         if (CHECK_FLAG(peer->sflags, PEER_STATUS_GROUP)) {
 473                 group = peer->group;
 474                 for (ALL_LIST_ELEMENTS(group->peer, node, nnode, peer)) {
 475                         command = 0;
 476                         if (!peer->bfd_info)
 477                                 bfd_set_param(
 478                                         (struct bfd_info **)&(peer->bfd_info),
 479                                         BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
 480                                         BFD_DEF_DETECT_MULT, 1, &command);
 481
 482                         bfd_info = (struct bfd_info *)peer->bfd_info;
 483                         bfd_info->type = type;
 484
 485                         if (peer->status == Established) {
 486                                 if (command == ZEBRA_BFD_DEST_REGISTER)
 487                                         bgp_bfd_register_peer(peer);
 488                                 else
 489                                         bgp_bfd_update_type(peer);
 490                         }
 491                 }
 492         } else {
 493                 if (peer->status == Established) {
 494                         if (command == ZEBRA_BFD_DEST_REGISTER)
 495                                 bgp_bfd_register_peer(peer);
 496                         else
 497                                 bgp_bfd_update_type(peer);
 498                 }
 499         }
 500
 501         return 0;
 502 }
 503
 504 /*
 505  * bgp_bfd_peer_config_write - Write the peer BFD configuration.
 506  */
 507 void bgp_bfd_peer_config_write(struct vty *vty, struct peer *peer, char *addr)
 508 {
 509         struct bfd_info *bfd_info;
 510
 511         if (!peer->bfd_info)
 512                 return;
 513
 514         bfd_info = (struct bfd_info *)peer->bfd_info;
 515
 516         if (CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG))
 517 #if HAVE_BFDD > 0
 518                 vty_out(vty, " neighbor %s bfd\n", addr);
 519 #else
 520                 vty_out(vty, " neighbor %s bfd %d %d %d\n", addr,
 521                         bfd_info->detect_mult, bfd_info->required_min_rx,
 522                         bfd_info->desired_min_tx);
 523 #endif /* HAVE_BFDD */
 524
 525         if (bfd_info->type != BFD_TYPE_NOT_CONFIGURED)
 526                 vty_out(vty, " neighbor %s bfd %s\n", addr,
 527                         (bfd_info->type == BFD_TYPE_MULTIHOP) ? "multihop"
 528                                                               : "singlehop");
 529
 530         if (!CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG)
 531             && (bfd_info->type == BFD_TYPE_NOT_CONFIGURED))
 532                 vty_out(vty, " neighbor %s bfd\n", addr);
 533 }
 534
 535 /*
 536  * bgp_bfd_show_info - Show the peer BFD information.
 537  */
 538 void bgp_bfd_show_info(struct vty *vty, struct peer *peer, bool use_json,
 539                        json_object *json_neigh)
 540 {
 541         bfd_show_info(vty, (struct bfd_info *)peer->bfd_info,
 542                       bgp_bfd_is_peer_multihop(peer), 0, use_json, json_neigh);
 543 }
 544
 545 DEFUN (neighbor_bfd,
 546        neighbor_bfd_cmd,
 547        "neighbor <A.B.C.D|X:X::X:X|WORD> bfd",
 548        NEIGHBOR_STR
 549        NEIGHBOR_ADDR_STR2
 550        "Enables BFD support\n")
 551 {
 552         int idx_peer = 1;
 553         struct peer *peer;
 554         int ret;
 555
 556         peer = peer_and_group_lookup_vty(vty, argv[idx_peer]->arg);
 557         if (!peer)
 558                 return CMD_WARNING_CONFIG_FAILED;
 559
 560         ret = bgp_bfd_peer_param_set(peer, BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
 561                                      BFD_DEF_DETECT_MULT, 1);
 562         if (ret != 0)
 563                 return bgp_vty_return(vty, ret);
 564
 565         return CMD_SUCCESS;
 566 }
 567
 568 #if HAVE_BFDD > 0
 569 DEFUN_HIDDEN(
 570 #else
 571 DEFUN(
 572 #endif /* HAVE_BFDD */
 573        neighbor_bfd_param,
 574        neighbor_bfd_param_cmd,
 575        "neighbor <A.B.C.D|X:X::X:X|WORD> bfd (2-255) (50-60000) (50-60000)",
 576        NEIGHBOR_STR
 577        NEIGHBOR_ADDR_STR2
 578        "Enables BFD support\n"
 579        "Detect Multiplier\n"
 580        "Required min receive interval\n"
 581        "Desired min transmit interval\n")
 582 {
 583         int idx_peer = 1;
 584         int idx_number_1 = 3;
 585         int idx_number_2 = 4;
 586         int idx_number_3 = 5;
 587         struct peer *peer;
 588         uint32_t rx_val;
 589         uint32_t tx_val;
 590         uint8_t dm_val;
 591         int ret;
 592
 593         peer = peer_and_group_lookup_vty(vty, argv[idx_peer]->arg);
 594         if (!peer)
 595                 return CMD_WARNING_CONFIG_FAILED;
 596
 597         if ((ret = bfd_validate_param(
 598                      vty, argv[idx_number_1]->arg, argv[idx_number_2]->arg,
 599                      argv[idx_number_3]->arg, &dm_val, &rx_val, &tx_val))
 600             != CMD_SUCCESS)
 601                 return ret;
 602
 603         ret = bgp_bfd_peer_param_set(peer, rx_val, tx_val, dm_val, 0);
 604         if (ret != 0)
 605                 return bgp_vty_return(vty, ret);
 606
 607         return CMD_SUCCESS;
 608 }
 609
 610 DEFUN_HIDDEN (neighbor_bfd_type,
 611        neighbor_bfd_type_cmd,
 612        "neighbor <A.B.C.D|X:X::X:X|WORD> bfd <multihop|singlehop>",
 613        NEIGHBOR_STR
 614        NEIGHBOR_ADDR_STR2
 615        "Enables BFD support\n"
 616        "Multihop session\n"
 617        "Single hop session\n")
 618 {
 619         int idx_peer = 1;
 620         int idx_hop = 3;
 621         struct peer *peer;
 622         enum bfd_sess_type type;
 623         int ret;
 624
 625         peer = peer_and_group_lookup_vty(vty, argv[idx_peer]->arg);
 626         if (!peer)
 627                 return CMD_WARNING_CONFIG_FAILED;
 628
 629         if (strmatch(argv[idx_hop]->text, "singlehop"))
 630                 type = BFD_TYPE_SINGLEHOP;
 631         else if (strmatch(argv[idx_hop]->text, "multihop"))
 632                 type = BFD_TYPE_MULTIHOP;
 633         else
 634                 return CMD_WARNING_CONFIG_FAILED;
 635
 636         ret = bgp_bfd_peer_param_type_set(peer, type);
 637         if (ret != 0)
 638                 return bgp_vty_return(vty, ret);
 639
 640         return CMD_SUCCESS;
 641 }
 642
 643 DEFUN (no_neighbor_bfd,
 644        no_neighbor_bfd_cmd,
 645 #if HAVE_BFDD > 0
 646        "no neighbor <A.B.C.D|X:X::X:X|WORD> bfd",
 647 #else
 648        "no neighbor <A.B.C.D|X:X::X:X|WORD> bfd [(2-255) (50-60000) (50-60000)]",
 649 #endif /* HAVE_BFDD */
 650        NO_STR
 651        NEIGHBOR_STR
 652        NEIGHBOR_ADDR_STR2
 653        "Disables BFD support\n"
 654 #if HAVE_BFDD == 0
 655        "Detect Multiplier\n"
 656        "Required min receive interval\n"
 657        "Desired min transmit interval\n"
 658 #endif /* !HAVE_BFDD */
 659 )
 660 {
 661         int idx_peer = 2;
 662         struct peer *peer;
 663         int ret;
 664
 665         peer = peer_and_group_lookup_vty(vty, argv[idx_peer]->arg);
 666         if (!peer)
 667                 return CMD_WARNING_CONFIG_FAILED;
 668
 669         ret = bgp_bfd_peer_param_unset(peer);
 670         if (ret != 0)
 671                 return bgp_vty_return(vty, ret);
 672
 673         return CMD_SUCCESS;
 674 }
 675
 676
 677 DEFUN_HIDDEN (no_neighbor_bfd_type,
 678        no_neighbor_bfd_type_cmd,
 679        "no neighbor <A.B.C.D|X:X::X:X|WORD> bfd <multihop|singlehop>",
 680        NO_STR
 681        NEIGHBOR_STR
 682        NEIGHBOR_ADDR_STR2
 683        "Disables BFD support\n"
 684        "Multihop session\n"
 685        "Singlehop session\n")
 686 {
 687         int idx_peer = 2;
 688         struct peer *peer;
 689         int ret;
 690
 691         peer = peer_and_group_lookup_vty(vty, argv[idx_peer]->arg);
 692         if (!peer)
 693                 return CMD_WARNING_CONFIG_FAILED;
 694
 695         if (!peer->bfd_info)
 696                 return 0;
 697
 698         ret = bgp_bfd_peer_param_type_set(peer, BFD_TYPE_NOT_CONFIGURED);
 699         if (ret != 0)
 700                 return bgp_vty_return(vty, ret);
 701
 702         return CMD_SUCCESS;
 703 }
 704
 705 void bgp_bfd_init(void)
 706 {
 707         bfd_gbl_init();
 708
 709         /* Initialize BFD client functions */
 710         zclient->interface_bfd_dest_update = bgp_bfd_dest_update;
 711         zclient->bfd_dest_replay = bgp_bfd_dest_replay;
 712
 713         /* "neighbor bfd" commands. */
 714         install_element(BGP_NODE, &neighbor_bfd_cmd);
 715         install_element(BGP_NODE, &neighbor_bfd_param_cmd);
 716         install_element(BGP_NODE, &neighbor_bfd_type_cmd);
 717         install_element(BGP_NODE, &no_neighbor_bfd_cmd);
 718         install_element(BGP_NODE, &no_neighbor_bfd_type_cmd);
 719 }