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