ospf6d/ospf6_bfd.c

   1 /**
   2  * ospf6_bfd.c: IPv6 OSPF 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 "vty.h"
  34 #include "table.h"
  35 #include "bfd.h"
  36 #include "if.h"
  37 #include "ospf6d.h"
  38 #include "ospf6_message.h"
  39 #include "ospf6_neighbor.h"
  40 #include "ospf6_interface.h"
  41 #include "ospf6_route.h"
  42 #include "ospf6_zebra.h"
  43 #include "ospf6_bfd.h"
  44
  45 extern struct zclient *zclient;
  46
  47 /*
  48  * ospf6_bfd_info_free - Free BFD info structure
  49  */
  50 void ospf6_bfd_info_free(void **bfd_info)
  51 {
  52         bfd_info_free((struct bfd_info **)bfd_info);
  53 }
  54
  55 /*
  56  * ospf6_bfd_show_info - Show BFD info structure
  57  */
  58 void ospf6_bfd_show_info(struct vty *vty, void *bfd_info, int param_only)
  59 {
  60         if (param_only)
  61                 bfd_show_param(vty, bfd_info, 1, 0, 0, NULL);
  62         else
  63                 bfd_show_info(vty, bfd_info, 0, 1, 0, NULL);
  64 }
  65
  66 /*
  67  * ospf6_bfd_reg_dereg_nbr - Register/Deregister a neighbor with BFD through
  68  *                           zebra for starting/stopping the monitoring of
  69  *                           the neighbor rechahability.
  70  */
  71 void ospf6_bfd_reg_dereg_nbr(struct ospf6_neighbor *on, int command)
  72 {
  73         struct ospf6_interface *oi = on->ospf6_if;
  74         struct interface *ifp = oi->interface;
  75         struct bfd_info *bfd_info;
  76         char src[64];
  77         int cbit;
  78
  79         if (!oi->bfd_info || !on->bfd_info)
  80                 return;
  81         bfd_info = (struct bfd_info *)oi->bfd_info;
  82
  83         if (IS_OSPF6_DEBUG_ZEBRA(SEND)) {
  84                 inet_ntop(AF_INET6, &on->linklocal_addr, src, sizeof(src));
  85                 zlog_debug("%s nbr (%s) with BFD",
  86                            bfd_get_command_dbg_str(command), src);
  87         }
  88
  89         cbit = CHECK_FLAG(bfd_info->flags, BFD_FLAG_BFD_CBIT_ON);
  90
  91         bfd_peer_sendmsg(zclient, bfd_info, AF_INET6, &on->linklocal_addr,
  92                          on->ospf6_if->linklocal_addr, ifp->name, 0, 0, cbit,
  93                          command, 0, ifp->vrf_id);
  94
  95         if (command == ZEBRA_BFD_DEST_DEREGISTER)
  96                 bfd_info_free((struct bfd_info **)&on->bfd_info);
  97 }
  98
  99 /*
 100  * ospf6_bfd_trigger_event - Neighbor is registered/deregistered with BFD when
 101  *                           neighbor state is changed to/from 2way.
 102  */
 103 void ospf6_bfd_trigger_event(struct ospf6_neighbor *on, int old_state,
 104                              int state)
 105 {
 106         if ((old_state < OSPF6_NEIGHBOR_TWOWAY)
 107             && (state >= OSPF6_NEIGHBOR_TWOWAY))
 108                 ospf6_bfd_reg_dereg_nbr(on, ZEBRA_BFD_DEST_REGISTER);
 109         else if ((old_state >= OSPF6_NEIGHBOR_TWOWAY)
 110                  && (state < OSPF6_NEIGHBOR_TWOWAY))
 111                 ospf6_bfd_reg_dereg_nbr(on, ZEBRA_BFD_DEST_DEREGISTER);
 112 }
 113
 114 /*
 115  * ospf6_bfd_reg_dereg_all_nbr - Register/Deregister all neighbors associated
 116  *                               with a interface with BFD through
 117  *                               zebra for starting/stopping the monitoring of
 118  *                               the neighbor rechahability.
 119  */
 120 static void ospf6_bfd_reg_dereg_all_nbr(struct ospf6_interface *oi, int command)
 121 {
 122         struct ospf6_neighbor *on;
 123         struct listnode *node;
 124
 125         for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, node, on)) {
 126                 if (command == ZEBRA_BFD_DEST_REGISTER)
 127                         ospf6_bfd_info_nbr_create(oi, on);
 128
 129                 if (on->state < OSPF6_NEIGHBOR_TWOWAY) {
 130                         if (command == ZEBRA_BFD_DEST_DEREGISTER)
 131                                 bfd_info_free(
 132                                         (struct bfd_info **)&on->bfd_info);
 133                         continue;
 134                 }
 135
 136                 ospf6_bfd_reg_dereg_nbr(on, command);
 137         }
 138 }
 139
 140 /*
 141  * ospf6_bfd_nbr_replay - Replay all the neighbors that have BFD enabled
 142  *                        to zebra
 143  */
 144 static int ospf6_bfd_nbr_replay(ZAPI_CALLBACK_ARGS)
 145 {
 146         struct vrf *vrf = vrf_lookup_by_id(vrf_id);
 147         struct listnode *node;
 148         struct interface *ifp;
 149         struct ospf6_interface *oi;
 150         struct ospf6_neighbor *on;
 151         char dst[64];
 152
 153         if (IS_OSPF6_DEBUG_ZEBRA(RECV))
 154                 zlog_debug("Zebra: BFD Dest replay request");
 155
 156         /* Send the client registration */
 157         bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER, vrf_id);
 158
 159         /* Replay the neighbor, if BFD is enabled on the interface*/
 160         FOR_ALL_INTERFACES (vrf, ifp) {
 161                 oi = (struct ospf6_interface *)ifp->info;
 162
 163                 if (!oi || !oi->bfd_info)
 164                         continue;
 165
 166                 for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, node, on)) {
 167                         if (on->state < OSPF6_NEIGHBOR_TWOWAY)
 168                                 continue;
 169
 170                         if (IS_OSPF6_DEBUG_ZEBRA(SEND)) {
 171                                 inet_ntop(AF_INET6, &on->linklocal_addr, dst,
 172                                           sizeof(dst));
 173                                 zlog_debug("Replaying nbr (%s) to BFD", dst);
 174                         }
 175
 176                         ospf6_bfd_reg_dereg_nbr(on, ZEBRA_BFD_DEST_UPDATE);
 177                 }
 178         }
 179         return 0;
 180 }
 181
 182 /*
 183  * ospf6_bfd_interface_dest_update - Find the neighbor for which the BFD status
 184  *                                   has changed and bring down the neighbor
 185  *                                   connectivity if BFD down is received.
 186  */
 187 static int ospf6_bfd_interface_dest_update(ZAPI_CALLBACK_ARGS)
 188 {
 189         struct interface *ifp;
 190         struct ospf6_interface *oi;
 191         struct ospf6_neighbor *on;
 192         struct prefix dp;
 193         struct prefix sp;
 194         struct listnode *node, *nnode;
 195         char dst[64];
 196         int status;
 197         int old_status;
 198         struct bfd_info *bfd_info;
 199         struct timeval tv;
 200
 201         ifp = bfd_get_peer_info(zclient->ibuf, &dp, &sp, &status,
 202                                 NULL, vrf_id);
 203
 204         if ((ifp == NULL) || (dp.family != AF_INET6))
 205                 return 0;
 206
 207         if (IS_OSPF6_DEBUG_ZEBRA(RECV))
 208                 zlog_debug("Zebra: interface %s bfd destination %pFX %s",
 209                            ifp->name, &dp, bfd_get_status_str(status));
 210
 211
 212         oi = (struct ospf6_interface *)ifp->info;
 213         if (!oi || !oi->bfd_info)
 214                 return 0;
 215
 216         for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on)) {
 217                 if (memcmp(&(on->linklocal_addr), &dp.u.prefix6,
 218                            sizeof(struct in6_addr)))
 219                         continue;
 220
 221                 if (IS_OSPF6_DEBUG_NEIGHBOR(EVENT)) {
 222                         inet_ntop(AF_INET6, &on->linklocal_addr, dst,
 223                                   sizeof(dst));
 224                         zlog_debug("[%s:%s]: BFD %s", ifp->name, dst,
 225                                    bfd_get_status_str(status));
 226                 }
 227
 228                 if (!on->bfd_info)
 229                         continue;
 230
 231                 bfd_info = (struct bfd_info *)on->bfd_info;
 232                 if (bfd_info->status == status)
 233                         continue;
 234
 235                 old_status = bfd_info->status;
 236                 BFD_SET_CLIENT_STATUS(bfd_info->status, status);
 237                 monotime(&tv);
 238                 bfd_info->last_update = tv.tv_sec;
 239
 240                 if ((status == BFD_STATUS_DOWN)
 241                     && (old_status == BFD_STATUS_UP)) {
 242                         THREAD_OFF(on->inactivity_timer);
 243                         thread_add_event(master, inactivity_timer, on, 0, NULL);
 244                 }
 245         }
 246
 247         return 0;
 248 }
 249
 250 /*
 251  * ospf6_bfd_info_nbr_create - Create/update BFD information for a neighbor.
 252  */
 253 void ospf6_bfd_info_nbr_create(struct ospf6_interface *oi,
 254                                struct ospf6_neighbor *on)
 255 {
 256         struct bfd_info *oi_bfd_info;
 257         struct bfd_info *on_bfd_info;
 258
 259         if (!oi->bfd_info)
 260                 return;
 261
 262         oi_bfd_info = (struct bfd_info *)oi->bfd_info;
 263
 264         if (!on->bfd_info)
 265                 on->bfd_info = bfd_info_create();
 266
 267         on_bfd_info = (struct bfd_info *)on->bfd_info;
 268         on_bfd_info->detect_mult = oi_bfd_info->detect_mult;
 269         on_bfd_info->desired_min_tx = oi_bfd_info->desired_min_tx;
 270         on_bfd_info->required_min_rx = oi_bfd_info->required_min_rx;
 271 }
 272
 273 /*
 274  * ospf6_bfd_write_config - Write the interface BFD configuration.
 275  */
 276 void ospf6_bfd_write_config(struct vty *vty, struct ospf6_interface *oi)
 277 {
 278 #if HAVE_BFDD == 0
 279         struct bfd_info *bfd_info;
 280 #endif /* ! HAVE_BFDD */
 281
 282         if (!oi->bfd_info)
 283                 return;
 284
 285 #if HAVE_BFDD == 0
 286         bfd_info = (struct bfd_info *)oi->bfd_info;
 287
 288         if (CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG))
 289                 vty_out(vty, " ipv6 ospf6 bfd %d %d %d\n",
 290                         bfd_info->detect_mult, bfd_info->required_min_rx,
 291                         bfd_info->desired_min_tx);
 292         else
 293 #endif /* ! HAVE_BFDD */
 294                 vty_out(vty, " ipv6 ospf6 bfd\n");
 295 }
 296
 297 /*
 298  * ospf6_bfd_if_param_set - Set the configured BFD paramter values for
 299  *                            interface.
 300  */
 301 static void ospf6_bfd_if_param_set(struct ospf6_interface *oi, uint32_t min_rx,
 302                                    uint32_t min_tx, uint8_t detect_mult,
 303                                    int defaults)
 304 {
 305         int command = 0;
 306
 307         bfd_set_param((struct bfd_info **)&(oi->bfd_info), min_rx, min_tx,
 308                       detect_mult, NULL, defaults, &command);
 309         if (command)
 310                 ospf6_bfd_reg_dereg_all_nbr(oi, command);
 311 }
 312
 313 DEFUN (ipv6_ospf6_bfd,
 314        ipv6_ospf6_bfd_cmd,
 315        "ipv6 ospf6 bfd",
 316        IP6_STR
 317        OSPF6_STR
 318        "Enables BFD support\n"
 319        )
 320 {
 321         VTY_DECLVAR_CONTEXT(interface, ifp);
 322         struct ospf6_interface *oi;
 323         assert(ifp);
 324
 325         oi = (struct ospf6_interface *)ifp->info;
 326         if (oi == NULL)
 327                 oi = ospf6_interface_create(ifp);
 328         assert(oi);
 329
 330         ospf6_bfd_if_param_set(oi, BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
 331                                BFD_DEF_DETECT_MULT, 1);
 332         return CMD_SUCCESS;
 333 }
 334
 335 #if HAVE_BFDD > 0
 336 DEFUN_HIDDEN(
 337 #else
 338 DEFUN(
 339 #endif /* HAVE_BFDD */
 340        ipv6_ospf6_bfd_param,
 341        ipv6_ospf6_bfd_param_cmd,
 342        "ipv6 ospf6 bfd (2-255) (50-60000) (50-60000)",
 343        IP6_STR
 344        OSPF6_STR
 345        "Enables BFD support\n"
 346        "Detect Multiplier\n"
 347        "Required min receive interval\n"
 348        "Desired min transmit interval\n")
 349 {
 350         VTY_DECLVAR_CONTEXT(interface, ifp);
 351         int idx_number = 3;
 352         int idx_number_2 = 4;
 353         int idx_number_3 = 5;
 354         struct ospf6_interface *oi;
 355         uint32_t rx_val;
 356         uint32_t tx_val;
 357         uint8_t dm_val;
 358         int ret;
 359
 360         assert(ifp);
 361
 362         oi = (struct ospf6_interface *)ifp->info;
 363         if (oi == NULL)
 364                 oi = ospf6_interface_create(ifp);
 365         assert(oi);
 366
 367         if ((ret = bfd_validate_param(
 368                      vty, argv[idx_number]->arg, argv[idx_number_2]->arg,
 369                      argv[idx_number_3]->arg, &dm_val, &rx_val, &tx_val))
 370             != CMD_SUCCESS)
 371                 return ret;
 372
 373         ospf6_bfd_if_param_set(oi, rx_val, tx_val, dm_val, 0);
 374
 375         return CMD_SUCCESS;
 376 }
 377
 378 DEFUN (no_ipv6_ospf6_bfd,
 379        no_ipv6_ospf6_bfd_cmd,
 380        "no ipv6 ospf6 bfd",
 381        NO_STR
 382        IP6_STR
 383        OSPF6_STR
 384        "Disables BFD support\n"
 385        )
 386 {
 387         VTY_DECLVAR_CONTEXT(interface, ifp);
 388         struct ospf6_interface *oi;
 389         assert(ifp);
 390
 391         oi = (struct ospf6_interface *)ifp->info;
 392         if (oi == NULL)
 393                 oi = ospf6_interface_create(ifp);
 394         assert(oi);
 395
 396         if (oi->bfd_info) {
 397                 ospf6_bfd_reg_dereg_all_nbr(oi, ZEBRA_BFD_DEST_DEREGISTER);
 398                 bfd_info_free((struct bfd_info **)&(oi->bfd_info));
 399         }
 400
 401         return CMD_SUCCESS;
 402 }
 403
 404 void ospf6_bfd_init(void)
 405 {
 406         bfd_gbl_init();
 407
 408         /* Initialize BFD client functions */
 409         zclient->interface_bfd_dest_update = ospf6_bfd_interface_dest_update;
 410         zclient->bfd_dest_replay = ospf6_bfd_nbr_replay;
 411
 412         /* Install BFD command */
 413         install_element(INTERFACE_NODE, &ipv6_ospf6_bfd_cmd);
 414         install_element(INTERFACE_NODE, &ipv6_ospf6_bfd_param_cmd);
 415         install_element(INTERFACE_NODE, &no_ipv6_ospf6_bfd_cmd);
 416 }