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 && (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
 216                         && CHECK_FLAG(bfd_info->flags,
 217                                       BFD_FLAG_BFD_TYPE_MULTIHOP))) {
 218                         bgp_bfd_peer_sendmsg(peer, ZEBRA_BFD_DEST_DEREGISTER);
 219                         bgp_bfd_peer_sendmsg(peer, ZEBRA_BFD_DEST_REGISTER);
 220                 }
 221         } else {
 222                 if ((bfd_info->type == BFD_TYPE_MULTIHOP
 223                      && !CHECK_FLAG(bfd_info->flags,
 224                                     BFD_FLAG_BFD_TYPE_MULTIHOP))
 225                     || (bfd_info->type == BFD_TYPE_SINGLEHOP
 226                         && CHECK_FLAG(bfd_info->flags,
 227                                       BFD_FLAG_BFD_TYPE_MULTIHOP))) {
 228                         bgp_bfd_peer_sendmsg(peer, ZEBRA_BFD_DEST_DEREGISTER);
 229                         bgp_bfd_peer_sendmsg(peer, ZEBRA_BFD_DEST_REGISTER);
 230                 }
 231         }
 232 }
 233
 234 /*
 235  * bgp_bfd_dest_replay - Replay all the peers that have BFD enabled
 236  *                       to zebra
 237  */
 238 static int bgp_bfd_dest_replay(int command, struct zclient *client,
 239                                zebra_size_t length, vrf_id_t vrf_id)
 240 {
 241         struct listnode *mnode, *node, *nnode;
 242         struct bgp *bgp;
 243         struct peer *peer;
 244
 245         if (BGP_DEBUG(zebra, ZEBRA))
 246                 zlog_debug("Zebra: BFD Dest replay request");
 247
 248         /* Send the client registration */
 249         bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER);
 250
 251         /* Replay the peer, if BFD is enabled in BGP */
 252
 253         for (ALL_LIST_ELEMENTS_RO(bm->bgp, mnode, bgp))
 254                 for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
 255                         bgp_bfd_update_peer(peer);
 256                 }
 257
 258         return 0;
 259 }
 260
 261 /*
 262  * bgp_bfd_peer_status_update - Update the BFD status if it has changed. Bring
 263  *                              down the peer if the BFD session went down from
 264  * *                              up.
 265  */
 266 static void bgp_bfd_peer_status_update(struct peer *peer, int status)
 267 {
 268         struct bfd_info *bfd_info;
 269         int old_status;
 270
 271         bfd_info = (struct bfd_info *)peer->bfd_info;
 272
 273         if (bfd_info->status == status)
 274                 return;
 275
 276         old_status = bfd_info->status;
 277         bfd_info->status = status;
 278         bfd_info->last_update = bgp_clock();
 279
 280         if ((status == BFD_STATUS_DOWN) && (old_status == BFD_STATUS_UP)) {
 281                 peer->last_reset = PEER_DOWN_BFD_DOWN;
 282                 BGP_EVENT_ADD(peer, BGP_Stop);
 283         }
 284 }
 285
 286 /*
 287  * bgp_bfd_dest_update - Find the peer for which the BFD status
 288  *                       has changed and bring down the peer
 289  *                       connectivity if the BFD session went down.
 290  */
 291 static int bgp_bfd_dest_update(int command, struct zclient *zclient,
 292                                zebra_size_t length, vrf_id_t vrf_id)
 293 {
 294         struct interface *ifp;
 295         struct prefix dp;
 296         struct prefix sp;
 297         int status;
 298
 299         ifp = bfd_get_peer_info(zclient->ibuf, &dp, &sp, &status, vrf_id);
 300
 301         if (BGP_DEBUG(zebra, ZEBRA)) {
 302                 char buf[2][PREFIX2STR_BUFFER];
 303                 prefix2str(&dp, buf[0], sizeof(buf[0]));
 304                 if (ifp) {
 305                         zlog_debug(
 306                                 "Zebra: vrf %d interface %s bfd destination %s %s",
 307                                 vrf_id, ifp->name, buf[0],
 308                                 bfd_get_status_str(status));
 309                 } else {
 310                         prefix2str(&sp, buf[1], sizeof(buf[1]));
 311                         zlog_debug(
 312                                 "Zebra: vrf %d source %s bfd destination %s %s",
 313                                 vrf_id, buf[1], buf[0],
 314                                 bfd_get_status_str(status));
 315                 }
 316         }
 317
 318         /* Bring the peer down if BFD is enabled in BGP */
 319         {
 320                 struct listnode *mnode, *node, *nnode;
 321                 struct bgp *bgp;
 322                 struct peer *peer;
 323
 324                 for (ALL_LIST_ELEMENTS_RO(bm->bgp, mnode, bgp))
 325                         for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
 326                                 if (!peer->bfd_info)
 327                                         continue;
 328
 329                                 if ((dp.family == AF_INET)
 330                                     && (peer->su.sa.sa_family == AF_INET)) {
 331                                         if (dp.u.prefix4.s_addr
 332                                             != peer->su.sin.sin_addr.s_addr)
 333                                                 continue;
 334                                 } else if ((dp.family == AF_INET6)
 335                                            && (peer->su.sa.sa_family
 336                                                == AF_INET6)) {
 337                                         if (memcmp(&dp.u.prefix6,
 338                                                    &peer->su.sin6.sin6_addr,
 339                                                    sizeof(struct in6_addr)))
 340                                                 continue;
 341                                 } else
 342                                         continue;
 343
 344                                 if (ifp && (ifp == peer->nexthop.ifp)) {
 345                                         bgp_bfd_peer_status_update(peer,
 346                                                                    status);
 347                                 } else {
 348                                         if (!peer->su_local)
 349                                                 continue;
 350
 351                                         if ((sp.family == AF_INET)
 352                                             && (peer->su_local->sa.sa_family
 353                                                 == AF_INET)) {
 354                                                 if (sp.u.prefix4.s_addr
 355                                                     != peer->su_local->sin
 356                                                                .sin_addr.s_addr)
 357                                                         continue;
 358                                         } else if ((sp.family == AF_INET6)
 359                                                    && (peer->su_local->sa
 360                                                                .sa_family
 361                                                        == AF_INET6)) {
 362                                                 if (memcmp(&sp.u.prefix6,
 363                                                            &peer->su_local->sin6
 364                                                                     .sin6_addr,
 365                                                            sizeof(struct
 366                                                                   in6_addr)))
 367                                                         continue;
 368                                         } else
 369                                                 continue;
 370
 371                                         if ((vrf_id != VRF_DEFAULT)
 372                                             && (peer->bgp->vrf_id != vrf_id))
 373                                                 continue;
 374
 375                                         bgp_bfd_peer_status_update(peer,
 376                                                                    status);
 377                                 }
 378                         }
 379         }
 380
 381         return 0;
 382 }
 383
 384 /*
 385  * bgp_bfd_peer_param_set - Set the configured BFD paramter values for peer.
 386  */
 387 static int bgp_bfd_peer_param_set(struct peer *peer, u_int32_t min_rx,
 388                                   u_int32_t min_tx, u_int8_t detect_mult,
 389                                   int defaults)
 390 {
 391         struct peer_group *group;
 392         struct listnode *node, *nnode;
 393         int command = 0;
 394
 395         bfd_set_param((struct bfd_info **)&(peer->bfd_info), min_rx, min_tx,
 396                       detect_mult, defaults, &command);
 397
 398         if (CHECK_FLAG(peer->sflags, PEER_STATUS_GROUP)) {
 399                 group = peer->group;
 400                 for (ALL_LIST_ELEMENTS(group->peer, node, nnode, peer)) {
 401                         command = 0;
 402                         bfd_set_param((struct bfd_info **)&(peer->bfd_info),
 403                                       min_rx, min_tx, detect_mult, defaults,
 404                                       &command);
 405
 406                         if ((peer->status == Established)
 407                             && (command == ZEBRA_BFD_DEST_REGISTER))
 408                                 bgp_bfd_register_peer(peer);
 409                         else if (command == ZEBRA_BFD_DEST_UPDATE)
 410                                 bgp_bfd_update_peer(peer);
 411                 }
 412         } else {
 413                 if ((peer->status == Established)
 414                     && (command == ZEBRA_BFD_DEST_REGISTER))
 415                         bgp_bfd_register_peer(peer);
 416                 else if (command == ZEBRA_BFD_DEST_UPDATE)
 417                         bgp_bfd_update_peer(peer);
 418         }
 419         return 0;
 420 }
 421
 422 /*
 423  * bgp_bfd_peer_param_unset - Delete the configured BFD paramter values for
 424  * peer.
 425  */
 426 static int bgp_bfd_peer_param_unset(struct peer *peer)
 427 {
 428         struct peer_group *group;
 429         struct listnode *node, *nnode;
 430
 431         if (!peer->bfd_info)
 432                 return 0;
 433
 434         if (CHECK_FLAG(peer->sflags, PEER_STATUS_GROUP)) {
 435                 bfd_info_free(&(peer->bfd_info));
 436                 group = peer->group;
 437                 for (ALL_LIST_ELEMENTS(group->peer, node, nnode, peer)) {
 438                         bgp_bfd_deregister_peer(peer);
 439                         bfd_info_free(&(peer->bfd_info));
 440                 }
 441         } else {
 442                 bgp_bfd_deregister_peer(peer);
 443                 bfd_info_free(&(peer->bfd_info));
 444         }
 445         return 0;
 446 }
 447
 448 /*
 449  * bgp_bfd_peer_param_type_set - set the BFD session type (multihop or
 450  * singlehop)
 451  */
 452 static int bgp_bfd_peer_param_type_set(struct peer *peer,
 453                                        enum bfd_sess_type type)
 454 {
 455         struct peer_group *group;
 456         struct listnode *node, *nnode;
 457         int command = 0;
 458         struct bfd_info *bfd_info;
 459
 460         if (!peer->bfd_info)
 461                 bfd_set_param((struct bfd_info **)&(peer->bfd_info),
 462                               BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
 463                               BFD_DEF_DETECT_MULT, 1, &command);
 464
 465         bfd_info = (struct bfd_info *)peer->bfd_info;
 466         bfd_info->type = type;
 467
 468         if (CHECK_FLAG(peer->sflags, PEER_STATUS_GROUP)) {
 469                 group = peer->group;
 470                 for (ALL_LIST_ELEMENTS(group->peer, node, nnode, peer)) {
 471                         command = 0;
 472                         if (!peer->bfd_info)
 473                                 bfd_set_param(
 474                                         (struct bfd_info **)&(peer->bfd_info),
 475                                         BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
 476                                         BFD_DEF_DETECT_MULT, 1, &command);
 477
 478                         bfd_info = (struct bfd_info *)peer->bfd_info;
 479                         bfd_info->type = type;
 480
 481                         if (peer->status == Established) {
 482                                 if (command == ZEBRA_BFD_DEST_REGISTER)
 483                                         bgp_bfd_register_peer(peer);
 484                                 else
 485                                         bgp_bfd_update_type(peer);
 486                         }
 487                 }
 488         } else {
 489                 if (peer->status == Established) {
 490                         if (command == ZEBRA_BFD_DEST_REGISTER)
 491                                 bgp_bfd_register_peer(peer);
 492                         else
 493                                 bgp_bfd_update_type(peer);
 494                 }
 495         }
 496
 497         return 0;
 498 }
 499
 500 /*
 501  * bgp_bfd_peer_config_write - Write the peer BFD configuration.
 502  */
 503 void bgp_bfd_peer_config_write(struct vty *vty, struct peer *peer, char *addr)
 504 {
 505         struct bfd_info *bfd_info;
 506
 507         if (!peer->bfd_info)
 508                 return;
 509
 510         bfd_info = (struct bfd_info *)peer->bfd_info;
 511
 512         if (CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG))
 513                 vty_out(vty, " neighbor %s bfd %d %d %d\n", addr,
 514                         bfd_info->detect_mult, bfd_info->required_min_rx,
 515                         bfd_info->desired_min_tx);
 516
 517         if (bfd_info->type != BFD_TYPE_NOT_CONFIGURED)
 518                 vty_out(vty, " neighbor %s bfd %s\n", addr,
 519                         (bfd_info->type == BFD_TYPE_MULTIHOP) ? "multihop"
 520                                                               : "singlehop");
 521
 522         if (!CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG)
 523             && (bfd_info->type == BFD_TYPE_NOT_CONFIGURED))
 524                 vty_out(vty, " neighbor %s bfd\n", addr);
 525 }
 526
 527 /*
 528  * bgp_bfd_show_info - Show the peer BFD information.
 529  */
 530 void bgp_bfd_show_info(struct vty *vty, struct peer *peer, u_char use_json,
 531                        json_object *json_neigh)
 532 {
 533         bfd_show_info(vty, (struct bfd_info *)peer->bfd_info,
 534                       bgp_bfd_is_peer_multihop(peer), 0, use_json, json_neigh);
 535 }
 536
 537 DEFUN (neighbor_bfd,
 538        neighbor_bfd_cmd,
 539        "neighbor <A.B.C.D|X:X::X:X|WORD> bfd",
 540        NEIGHBOR_STR
 541        NEIGHBOR_ADDR_STR2
 542        "Enables BFD support\n")
 543 {
 544         int idx_peer = 1;
 545         struct peer *peer;
 546         int ret;
 547
 548         peer = peer_and_group_lookup_vty(vty, argv[idx_peer]->arg);
 549         if (!peer)
 550                 return CMD_WARNING_CONFIG_FAILED;
 551
 552         ret = bgp_bfd_peer_param_set(peer, BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
 553                                      BFD_DEF_DETECT_MULT, 1);
 554         if (ret != 0)
 555                 return bgp_vty_return(vty, ret);
 556
 557         return CMD_SUCCESS;
 558 }
 559
 560 DEFUN (neighbor_bfd_param,
 561        neighbor_bfd_param_cmd,
 562        "neighbor <A.B.C.D|X:X::X:X|WORD> bfd (2-255) (50-60000) (50-60000)",
 563        NEIGHBOR_STR
 564        NEIGHBOR_ADDR_STR2
 565        "Enables BFD support\n"
 566        "Detect Multiplier\n"
 567        "Required min receive interval\n"
 568        "Desired min transmit interval\n")
 569 {
 570         int idx_peer = 1;
 571         int idx_number_1 = 3;
 572         int idx_number_2 = 4;
 573         int idx_number_3 = 5;
 574         struct peer *peer;
 575         u_int32_t rx_val;
 576         u_int32_t tx_val;
 577         u_int8_t dm_val;
 578         int ret;
 579
 580         peer = peer_and_group_lookup_vty(vty, argv[idx_peer]->arg);
 581         if (!peer)
 582                 return CMD_WARNING_CONFIG_FAILED;
 583
 584         if ((ret = bfd_validate_param(
 585                      vty, argv[idx_number_1]->arg, argv[idx_number_2]->arg,
 586                      argv[idx_number_3]->arg, &dm_val, &rx_val, &tx_val))
 587             != CMD_SUCCESS)
 588                 return ret;
 589
 590         ret = bgp_bfd_peer_param_set(peer, rx_val, tx_val, dm_val, 0);
 591         if (ret != 0)
 592                 return bgp_vty_return(vty, ret);
 593
 594         return CMD_SUCCESS;
 595 }
 596
 597 DEFUN_HIDDEN (neighbor_bfd_type,
 598        neighbor_bfd_type_cmd,
 599        "neighbor <A.B.C.D|X:X::X:X|WORD> bfd <multihop|singlehop>",
 600        NEIGHBOR_STR
 601        NEIGHBOR_ADDR_STR2
 602        "Enables BFD support\n"
 603        "Multihop session\n"
 604        "Single hop session\n")
 605 {
 606         int idx_peer = 1;
 607         int idx_hop = 3;
 608         struct peer *peer;
 609         enum bfd_sess_type type;
 610         int ret;
 611
 612         peer = peer_and_group_lookup_vty(vty, argv[idx_peer]->arg);
 613         if (!peer)
 614                 return CMD_WARNING_CONFIG_FAILED;
 615
 616         if (strmatch(argv[idx_hop]->text, "singlehop"))
 617                 type = BFD_TYPE_SINGLEHOP;
 618         else if (strmatch(argv[idx_hop]->text, "multihop"))
 619                 type = BFD_TYPE_MULTIHOP;
 620         else
 621                 return CMD_WARNING_CONFIG_FAILED;
 622
 623         ret = bgp_bfd_peer_param_type_set(peer, type);
 624         if (ret != 0)
 625                 return bgp_vty_return(vty, ret);
 626
 627         return CMD_SUCCESS;
 628 }
 629
 630 DEFUN (no_neighbor_bfd,
 631        no_neighbor_bfd_cmd,
 632        "no neighbor <A.B.C.D|X:X::X:X|WORD> bfd [(2-255) (50-60000) (50-60000)]",
 633        NO_STR
 634        NEIGHBOR_STR
 635        NEIGHBOR_ADDR_STR2
 636        "Disables BFD support\n"
 637        "Detect Multiplier\n"
 638        "Required min receive interval\n"
 639        "Desired min transmit interval\n")
 640 {
 641         int idx_peer = 2;
 642         struct peer *peer;
 643         int ret;
 644
 645         peer = peer_and_group_lookup_vty(vty, argv[idx_peer]->arg);
 646         if (!peer)
 647                 return CMD_WARNING_CONFIG_FAILED;
 648
 649         ret = bgp_bfd_peer_param_unset(peer);
 650         if (ret != 0)
 651                 return bgp_vty_return(vty, ret);
 652
 653         return CMD_SUCCESS;
 654 }
 655
 656
 657 DEFUN_HIDDEN (no_neighbor_bfd_type,
 658        no_neighbor_bfd_type_cmd,
 659        "no neighbor <A.B.C.D|X:X::X:X|WORD> bfd <multihop|singlehop>",
 660        NO_STR
 661        NEIGHBOR_STR
 662        NEIGHBOR_ADDR_STR2
 663        "Disables BFD support\n"
 664        "Multihop session\n"
 665        "Singlehop session\n")
 666 {
 667         int idx_peer = 2;
 668         struct peer *peer;
 669         int ret;
 670
 671         peer = peer_and_group_lookup_vty(vty, argv[idx_peer]->arg);
 672         if (!peer)
 673                 return CMD_WARNING_CONFIG_FAILED;
 674
 675         if (!peer->bfd_info)
 676                 return 0;
 677
 678         ret = bgp_bfd_peer_param_type_set(peer, BFD_TYPE_NOT_CONFIGURED);
 679         if (ret != 0)
 680                 return bgp_vty_return(vty, ret);
 681
 682         return CMD_SUCCESS;
 683 }
 684
 685 void bgp_bfd_init(void)
 686 {
 687         bfd_gbl_init();
 688
 689         /* Initialize BFD client functions */
 690         zclient->interface_bfd_dest_update = bgp_bfd_dest_update;
 691         zclient->bfd_dest_replay = bgp_bfd_dest_replay;
 692
 693         /* "neighbor bfd" commands. */
 694         install_element(BGP_NODE, &neighbor_bfd_cmd);
 695         install_element(BGP_NODE, &neighbor_bfd_param_cmd);
 696         install_element(BGP_NODE, &neighbor_bfd_type_cmd);
 697         install_element(BGP_NODE, &no_neighbor_bfd_cmd);
 698         install_element(BGP_NODE, &no_neighbor_bfd_type_cmd);
 699 }