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(int command, struct zclient *zclient,
 142                                 zebra_size_t length, vrf_id_t vrf_id)
 143 {
 144         struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
 145         struct listnode *node;
 146         struct interface *ifp;
 147         struct ospf6_interface *oi;
 148         struct ospf6_neighbor *on;
 149         char dst[64];
 150
 151         if (IS_OSPF6_DEBUG_ZEBRA(RECV))
 152                 zlog_debug("Zebra: BFD Dest replay request");
 153
 154         /* Send the client registration */
 155         bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER);
 156
 157         /* Replay the neighbor, if BFD is enabled on the interface*/
 158         RB_FOREACH (ifp, if_name_head, &vrf->ifaces_by_name) {
 159                 oi = (struct ospf6_interface *)ifp->info;
 160
 161                 if (!oi || !oi->bfd_info)
 162                         continue;
 163
 164                 for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, node, on)) {
 165                         if (on->state < OSPF6_NEIGHBOR_TWOWAY)
 166                                 continue;
 167
 168                         if (IS_OSPF6_DEBUG_ZEBRA(SEND)) {
 169                                 inet_ntop(AF_INET6, &on->linklocal_addr, dst,
 170                                           sizeof(dst));
 171                                 zlog_debug("Replaying nbr (%s) to BFD", dst);
 172                         }
 173
 174                         ospf6_bfd_reg_dereg_nbr(on, ZEBRA_BFD_DEST_UPDATE);
 175                 }
 176         }
 177         return 0;
 178 }
 179
 180 /*
 181  * ospf6_bfd_interface_dest_update - Find the neighbor for which the BFD status
 182  *                                   has changed and bring down the neighbor
 183  *                                   connectivity if BFD down is received.
 184  */
 185 static int ospf6_bfd_interface_dest_update(int command, struct zclient *zclient,
 186                                            zebra_size_t length, vrf_id_t vrf_id)
 187 {
 188         struct interface *ifp;
 189         struct ospf6_interface *oi;
 190         struct ospf6_neighbor *on;
 191         struct prefix dp;
 192         struct prefix sp;
 193         struct listnode *node, *nnode;
 194         char dst[64];
 195         int status;
 196         int old_status;
 197         struct bfd_info *bfd_info;
 198         struct timeval tv;
 199
 200         ifp = bfd_get_peer_info(zclient->ibuf, &dp, &sp, &status, vrf_id);
 201
 202         if ((ifp == NULL) || (dp.family != AF_INET6))
 203                 return 0;
 204
 205         if (IS_OSPF6_DEBUG_ZEBRA(RECV)) {
 206                 char buf[PREFIX2STR_BUFFER];
 207                 prefix2str(&dp, buf, sizeof(buf));
 208                 zlog_debug("Zebra: interface %s bfd destination %s %s",
 209                            ifp->name, buf, bfd_get_status_str(status));
 210         }
 211
 212
 213         oi = (struct ospf6_interface *)ifp->info;
 214         if (!oi || !oi->bfd_info)
 215                 return 0;
 216
 217         for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on)) {
 218                 if (memcmp(&(on->linklocal_addr), &dp.u.prefix6,
 219                            sizeof(struct in6_addr)))
 220                         continue;
 221
 222                 if (IS_OSPF6_DEBUG_NEIGHBOR(EVENT)) {
 223                         inet_ntop(AF_INET6, &on->linklocal_addr, dst,
 224                                   sizeof(dst));
 225                         zlog_debug("[%s:%s]: BFD %s", ifp->name, dst,
 226                                    bfd_get_status_str(status));
 227                 }
 228
 229                 if (!on->bfd_info)
 230                         continue;
 231
 232                 bfd_info = (struct bfd_info *)on->bfd_info;
 233                 if (bfd_info->status == status)
 234                         continue;
 235
 236                 old_status = bfd_info->status;
 237                 bfd_info->status = status;
 238                 monotime(&tv);
 239                 bfd_info->last_update = tv.tv_sec;
 240
 241                 if ((status == BFD_STATUS_DOWN)
 242                     && (old_status == BFD_STATUS_UP)) {
 243                         THREAD_OFF(on->inactivity_timer);
 244                         thread_add_event(master, inactivity_timer, on, 0, NULL);
 245                 }
 246         }
 247
 248         return 0;
 249 }
 250
 251 /*
 252  * ospf6_bfd_info_nbr_create - Create/update BFD information for a neighbor.
 253  */
 254 void ospf6_bfd_info_nbr_create(struct ospf6_interface *oi,
 255                                struct ospf6_neighbor *on)
 256 {
 257         struct bfd_info *oi_bfd_info;
 258         struct bfd_info *on_bfd_info;
 259
 260         if (!oi->bfd_info)
 261                 return;
 262
 263         oi_bfd_info = (struct bfd_info *)oi->bfd_info;
 264
 265         if (!on->bfd_info)
 266                 on->bfd_info = bfd_info_create();
 267
 268         on_bfd_info = (struct bfd_info *)on->bfd_info;
 269         on_bfd_info->detect_mult = oi_bfd_info->detect_mult;
 270         on_bfd_info->desired_min_tx = oi_bfd_info->desired_min_tx;
 271         on_bfd_info->required_min_rx = oi_bfd_info->required_min_rx;
 272 }
 273
 274 /*
 275  * ospf6_bfd_write_config - Write the interface BFD configuration.
 276  */
 277 void ospf6_bfd_write_config(struct vty *vty, struct ospf6_interface *oi)
 278 {
 279         struct bfd_info *bfd_info;
 280
 281         if (!oi->bfd_info)
 282                 return;
 283
 284         bfd_info = (struct bfd_info *)oi->bfd_info;
 285
 286         if (CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG))
 287                 vty_out(vty, " ipv6 ospf6 bfd %d %d %d\n",
 288                         bfd_info->detect_mult, bfd_info->required_min_rx,
 289                         bfd_info->desired_min_tx);
 290         else
 291                 vty_out(vty, " ipv6 ospf6 bfd\n");
 292 }
 293
 294 /*
 295  * ospf6_bfd_if_param_set - Set the configured BFD paramter values for
 296  *                            interface.
 297  */
 298 static void ospf6_bfd_if_param_set(struct ospf6_interface *oi, u_int32_t min_rx,
 299                                    u_int32_t min_tx, u_int8_t detect_mult,
 300                                    int defaults)
 301 {
 302         int command = 0;
 303
 304         bfd_set_param((struct bfd_info **)&(oi->bfd_info), min_rx, min_tx,
 305                       detect_mult, defaults, &command);
 306         if (command)
 307                 ospf6_bfd_reg_dereg_all_nbr(oi, command);
 308 }
 309
 310 DEFUN (ipv6_ospf6_bfd,
 311        ipv6_ospf6_bfd_cmd,
 312        "ipv6 ospf6 bfd",
 313        IP6_STR
 314        OSPF6_STR
 315        "Enables BFD support\n"
 316        )
 317 {
 318         VTY_DECLVAR_CONTEXT(interface, ifp);
 319         struct ospf6_interface *oi;
 320         assert(ifp);
 321
 322         oi = (struct ospf6_interface *)ifp->info;
 323         if (oi == NULL)
 324                 oi = ospf6_interface_create(ifp);
 325         assert(oi);
 326
 327         ospf6_bfd_if_param_set(oi, BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
 328                                BFD_DEF_DETECT_MULT, 1);
 329         return CMD_SUCCESS;
 330 }
 331
 332 DEFUN (ipv6_ospf6_bfd_param,
 333        ipv6_ospf6_bfd_param_cmd,
 334        "ipv6 ospf6 bfd (2-255) (50-60000) (50-60000)",
 335        IP6_STR
 336        OSPF6_STR
 337        "Enables BFD support\n"
 338        "Detect Multiplier\n"
 339        "Required min receive interval\n"
 340        "Desired min transmit interval\n")
 341 {
 342         VTY_DECLVAR_CONTEXT(interface, ifp);
 343         int idx_number = 3;
 344         int idx_number_2 = 4;
 345         int idx_number_3 = 5;
 346         struct ospf6_interface *oi;
 347         u_int32_t rx_val;
 348         u_int32_t tx_val;
 349         u_int8_t dm_val;
 350         int ret;
 351
 352         assert(ifp);
 353
 354         oi = (struct ospf6_interface *)ifp->info;
 355         if (oi == NULL)
 356                 oi = ospf6_interface_create(ifp);
 357         assert(oi);
 358
 359         if ((ret = bfd_validate_param(
 360                      vty, argv[idx_number]->arg, argv[idx_number_2]->arg,
 361                      argv[idx_number_3]->arg, &dm_val, &rx_val, &tx_val))
 362             != CMD_SUCCESS)
 363                 return ret;
 364
 365         ospf6_bfd_if_param_set(oi, rx_val, tx_val, dm_val, 0);
 366
 367         return CMD_SUCCESS;
 368 }
 369
 370 DEFUN (no_ipv6_ospf6_bfd,
 371        no_ipv6_ospf6_bfd_cmd,
 372        "no ipv6 ospf6 bfd",
 373        NO_STR
 374        IP6_STR
 375        OSPF6_STR
 376        "Disables BFD support\n"
 377        )
 378 {
 379         VTY_DECLVAR_CONTEXT(interface, ifp);
 380         struct ospf6_interface *oi;
 381         assert(ifp);
 382
 383         oi = (struct ospf6_interface *)ifp->info;
 384         if (oi == NULL)
 385                 oi = ospf6_interface_create(ifp);
 386         assert(oi);
 387
 388         if (oi->bfd_info) {
 389                 ospf6_bfd_reg_dereg_all_nbr(oi, ZEBRA_BFD_DEST_DEREGISTER);
 390                 bfd_info_free((struct bfd_info **)&(oi->bfd_info));
 391         }
 392
 393         return CMD_SUCCESS;
 394 }
 395
 396 void ospf6_bfd_init(void)
 397 {
 398         bfd_gbl_init();
 399
 400         /* Initialize BFD client functions */
 401         zclient->interface_bfd_dest_update = ospf6_bfd_interface_dest_update;
 402         zclient->bfd_dest_replay = ospf6_bfd_nbr_replay;
 403
 404         /* Install BFD command */
 405         install_element(INTERFACE_NODE, &ipv6_ospf6_bfd_cmd);
 406         install_element(INTERFACE_NODE, &ipv6_ospf6_bfd_param_cmd);
 407         install_element(INTERFACE_NODE, &no_ipv6_ospf6_bfd_cmd);
 408 }