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
  78         if (!oi->bfd_info || !on->bfd_info)
  79                 return;
  80         bfd_info = (struct bfd_info *)oi->bfd_info;
  81
  82         if (IS_OSPF6_DEBUG_ZEBRA(SEND)) {
  83                 inet_ntop(AF_INET6, &on->linklocal_addr, src, sizeof(src));
  84                 zlog_debug("%s nbr (%s) with BFD",
  85                            bfd_get_command_dbg_str(command), src);
  86         }
  87
  88         bfd_peer_sendmsg(zclient, bfd_info, AF_INET6, &on->linklocal_addr,
  89                          on->ospf6_if->linklocal_addr, ifp->name, 0, 0, command,
  90                          0, VRF_DEFAULT);
  91
  92         if (command == ZEBRA_BFD_DEST_DEREGISTER)
  93                 bfd_info_free((struct bfd_info **)&on->bfd_info);
  94 }
  95
  96 /*
  97  * ospf6_bfd_trigger_event - Neighbor is registered/deregistered with BFD when
  98  *                           neighbor state is changed to/from 2way.
  99  */
 100 void ospf6_bfd_trigger_event(struct ospf6_neighbor *on, int old_state,
 101                              int state)
 102 {
 103         if ((old_state < OSPF6_NEIGHBOR_TWOWAY)
 104             && (state >= OSPF6_NEIGHBOR_TWOWAY))
 105                 ospf6_bfd_reg_dereg_nbr(on, ZEBRA_BFD_DEST_REGISTER);
 106         else if ((old_state >= OSPF6_NEIGHBOR_TWOWAY)
 107                  && (state < OSPF6_NEIGHBOR_TWOWAY))
 108                 ospf6_bfd_reg_dereg_nbr(on, ZEBRA_BFD_DEST_DEREGISTER);
 109 }
 110
 111 /*
 112  * ospf6_bfd_reg_dereg_all_nbr - Register/Deregister all neighbors associated
 113  *                               with a interface with BFD through
 114  *                               zebra for starting/stopping the monitoring of
 115  *                               the neighbor rechahability.
 116  */
 117 static void ospf6_bfd_reg_dereg_all_nbr(struct ospf6_interface *oi, int command)
 118 {
 119         struct ospf6_neighbor *on;
 120         struct listnode *node;
 121
 122         for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, node, on)) {
 123                 if (command == ZEBRA_BFD_DEST_REGISTER)
 124                         ospf6_bfd_info_nbr_create(oi, on);
 125
 126                 if (on->state < OSPF6_NEIGHBOR_TWOWAY) {
 127                         if (command == ZEBRA_BFD_DEST_DEREGISTER)
 128                                 bfd_info_free(
 129                                         (struct bfd_info **)&on->bfd_info);
 130                         continue;
 131                 }
 132
 133                 ospf6_bfd_reg_dereg_nbr(on, command);
 134         }
 135 }
 136
 137 /*
 138  * ospf6_bfd_nbr_replay - Replay all the neighbors that have BFD enabled
 139  *                        to zebra
 140  */
 141 static int ospf6_bfd_nbr_replay(ZAPI_CALLBACK_ARGS)
 142 {
 143         struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
 144         struct listnode *node;
 145         struct interface *ifp;
 146         struct ospf6_interface *oi;
 147         struct ospf6_neighbor *on;
 148         char dst[64];
 149
 150         if (IS_OSPF6_DEBUG_ZEBRA(RECV))
 151                 zlog_debug("Zebra: BFD Dest replay request");
 152
 153         /* Send the client registration */
 154         bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER, vrf_id);
 155
 156         /* Replay the neighbor, if BFD is enabled on the interface*/
 157         FOR_ALL_INTERFACES (vrf, ifp) {
 158                 oi = (struct ospf6_interface *)ifp->info;
 159
 160                 if (!oi || !oi->bfd_info)
 161                         continue;
 162
 163                 for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, node, on)) {
 164                         if (on->state < OSPF6_NEIGHBOR_TWOWAY)
 165                                 continue;
 166
 167                         if (IS_OSPF6_DEBUG_ZEBRA(SEND)) {
 168                                 inet_ntop(AF_INET6, &on->linklocal_addr, dst,
 169                                           sizeof(dst));
 170                                 zlog_debug("Replaying nbr (%s) to BFD", dst);
 171                         }
 172
 173                         ospf6_bfd_reg_dereg_nbr(on, ZEBRA_BFD_DEST_UPDATE);
 174                 }
 175         }
 176         return 0;
 177 }
 178
 179 /*
 180  * ospf6_bfd_interface_dest_update - Find the neighbor for which the BFD status
 181  *                                   has changed and bring down the neighbor
 182  *                                   connectivity if BFD down is received.
 183  */
 184 static int ospf6_bfd_interface_dest_update(ZAPI_CALLBACK_ARGS)
 185 {
 186         struct interface *ifp;
 187         struct ospf6_interface *oi;
 188         struct ospf6_neighbor *on;
 189         struct prefix dp;
 190         struct prefix sp;
 191         struct listnode *node, *nnode;
 192         char dst[64];
 193         int status;
 194         int old_status;
 195         struct bfd_info *bfd_info;
 196         struct timeval tv;
 197
 198         ifp = bfd_get_peer_info(zclient->ibuf, &dp, &sp, &status, vrf_id);
 199
 200         if ((ifp == NULL) || (dp.family != AF_INET6))
 201                 return 0;
 202
 203         if (IS_OSPF6_DEBUG_ZEBRA(RECV)) {
 204                 char buf[PREFIX2STR_BUFFER];
 205                 prefix2str(&dp, buf, sizeof(buf));
 206                 zlog_debug("Zebra: interface %s bfd destination %s %s",
 207                            ifp->name, buf, bfd_get_status_str(status));
 208         }
 209
 210
 211         oi = (struct ospf6_interface *)ifp->info;
 212         if (!oi || !oi->bfd_info)
 213                 return 0;
 214
 215         for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on)) {
 216                 if (memcmp(&(on->linklocal_addr), &dp.u.prefix6,
 217                            sizeof(struct in6_addr)))
 218                         continue;
 219
 220                 if (IS_OSPF6_DEBUG_NEIGHBOR(EVENT)) {
 221                         inet_ntop(AF_INET6, &on->linklocal_addr, dst,
 222                                   sizeof(dst));
 223                         zlog_debug("[%s:%s]: BFD %s", ifp->name, dst,
 224                                    bfd_get_status_str(status));
 225                 }
 226
 227                 if (!on->bfd_info)
 228                         continue;
 229
 230                 bfd_info = (struct bfd_info *)on->bfd_info;
 231                 if (bfd_info->status == status)
 232                         continue;
 233
 234                 old_status = bfd_info->status;
 235                 bfd_info->status = status;
 236                 monotime(&tv);
 237                 bfd_info->last_update = tv.tv_sec;
 238
 239                 if ((status == BFD_STATUS_DOWN)
 240                     && (old_status == BFD_STATUS_UP)) {
 241                         THREAD_OFF(on->inactivity_timer);
 242                         thread_add_event(master, inactivity_timer, on, 0, NULL);
 243                 }
 244         }
 245
 246         return 0;
 247 }
 248
 249 /*
 250  * ospf6_bfd_info_nbr_create - Create/update BFD information for a neighbor.
 251  */
 252 void ospf6_bfd_info_nbr_create(struct ospf6_interface *oi,
 253                                struct ospf6_neighbor *on)
 254 {
 255         struct bfd_info *oi_bfd_info;
 256         struct bfd_info *on_bfd_info;
 257
 258         if (!oi->bfd_info)
 259                 return;
 260
 261         oi_bfd_info = (struct bfd_info *)oi->bfd_info;
 262
 263         if (!on->bfd_info)
 264                 on->bfd_info = bfd_info_create();
 265
 266         on_bfd_info = (struct bfd_info *)on->bfd_info;
 267         on_bfd_info->detect_mult = oi_bfd_info->detect_mult;
 268         on_bfd_info->desired_min_tx = oi_bfd_info->desired_min_tx;
 269         on_bfd_info->required_min_rx = oi_bfd_info->required_min_rx;
 270 }
 271
 272 /*
 273  * ospf6_bfd_write_config - Write the interface BFD configuration.
 274  */
 275 void ospf6_bfd_write_config(struct vty *vty, struct ospf6_interface *oi)
 276 {
 277 #if HAVE_BFDD == 0
 278         struct bfd_info *bfd_info;
 279 #endif /* ! HAVE_BFDD */
 280
 281         if (!oi->bfd_info)
 282                 return;
 283
 284 #if HAVE_BFDD == 0
 285         bfd_info = (struct bfd_info *)oi->bfd_info;
 286
 287         if (CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG))
 288                 vty_out(vty, " ipv6 ospf6 bfd %d %d %d\n",
 289                         bfd_info->detect_mult, bfd_info->required_min_rx,
 290                         bfd_info->desired_min_tx);
 291         else
 292 #endif /* ! HAVE_BFDD */
 293                 vty_out(vty, " ipv6 ospf6 bfd\n");
 294 }
 295
 296 /*
 297  * ospf6_bfd_if_param_set - Set the configured BFD paramter values for
 298  *                            interface.
 299  */
 300 static void ospf6_bfd_if_param_set(struct ospf6_interface *oi, uint32_t min_rx,
 301                                    uint32_t min_tx, uint8_t detect_mult,
 302                                    int defaults)
 303 {
 304         int command = 0;
 305
 306         bfd_set_param((struct bfd_info **)&(oi->bfd_info), min_rx, min_tx,
 307                       detect_mult, defaults, &command);
 308         if (command)
 309                 ospf6_bfd_reg_dereg_all_nbr(oi, command);
 310 }
 311
 312 DEFUN (ipv6_ospf6_bfd,
 313        ipv6_ospf6_bfd_cmd,
 314        "ipv6 ospf6 bfd",
 315        IP6_STR
 316        OSPF6_STR
 317        "Enables BFD support\n"
 318        )
 319 {
 320         VTY_DECLVAR_CONTEXT(interface, ifp);
 321         struct ospf6_interface *oi;
 322         assert(ifp);
 323
 324         oi = (struct ospf6_interface *)ifp->info;
 325         if (oi == NULL)
 326                 oi = ospf6_interface_create(ifp);
 327         assert(oi);
 328
 329         ospf6_bfd_if_param_set(oi, BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
 330                                BFD_DEF_DETECT_MULT, 1);
 331         return CMD_SUCCESS;
 332 }
 333
 334 #if HAVE_BFDD > 0
 335 DEFUN_HIDDEN(
 336 #else
 337 DEFUN(
 338 #endif /* HAVE_BFDD */
 339        ipv6_ospf6_bfd_param,
 340        ipv6_ospf6_bfd_param_cmd,
 341        "ipv6 ospf6 bfd (2-255) (50-60000) (50-60000)",
 342        IP6_STR
 343        OSPF6_STR
 344        "Enables BFD support\n"
 345        "Detect Multiplier\n"
 346        "Required min receive interval\n"
 347        "Desired min transmit interval\n")
 348 {
 349         VTY_DECLVAR_CONTEXT(interface, ifp);
 350         int idx_number = 3;
 351         int idx_number_2 = 4;
 352         int idx_number_3 = 5;
 353         struct ospf6_interface *oi;
 354         uint32_t rx_val;
 355         uint32_t tx_val;
 356         uint8_t dm_val;
 357         int ret;
 358
 359         assert(ifp);
 360
 361         oi = (struct ospf6_interface *)ifp->info;
 362         if (oi == NULL)
 363                 oi = ospf6_interface_create(ifp);
 364         assert(oi);
 365
 366         if ((ret = bfd_validate_param(
 367                      vty, argv[idx_number]->arg, argv[idx_number_2]->arg,
 368                      argv[idx_number_3]->arg, &dm_val, &rx_val, &tx_val))
 369             != CMD_SUCCESS)
 370                 return ret;
 371
 372         ospf6_bfd_if_param_set(oi, rx_val, tx_val, dm_val, 0);
 373
 374         return CMD_SUCCESS;
 375 }
 376
 377 DEFUN (no_ipv6_ospf6_bfd,
 378        no_ipv6_ospf6_bfd_cmd,
 379        "no ipv6 ospf6 bfd",
 380        NO_STR
 381        IP6_STR
 382        OSPF6_STR
 383        "Disables BFD support\n"
 384        )
 385 {
 386         VTY_DECLVAR_CONTEXT(interface, ifp);
 387         struct ospf6_interface *oi;
 388         assert(ifp);
 389
 390         oi = (struct ospf6_interface *)ifp->info;
 391         if (oi == NULL)
 392                 oi = ospf6_interface_create(ifp);
 393         assert(oi);
 394
 395         if (oi->bfd_info) {
 396                 ospf6_bfd_reg_dereg_all_nbr(oi, ZEBRA_BFD_DEST_DEREGISTER);
 397                 bfd_info_free((struct bfd_info **)&(oi->bfd_info));
 398         }
 399
 400         return CMD_SUCCESS;
 401 }
 402
 403 void ospf6_bfd_init(void)
 404 {
 405         bfd_gbl_init();
 406
 407         /* Initialize BFD client functions */
 408         zclient->interface_bfd_dest_update = ospf6_bfd_interface_dest_update;
 409         zclient->bfd_dest_replay = ospf6_bfd_nbr_replay;
 410
 411         /* Install BFD command */
 412         install_element(INTERFACE_NODE, &ipv6_ospf6_bfd_cmd);
 413         install_element(INTERFACE_NODE, &ipv6_ospf6_bfd_param_cmd);
 414         install_element(INTERFACE_NODE, &no_ipv6_ospf6_bfd_cmd);
 415 }