pimd/pim_bfd.c

   1 /*
   2  * pim_bfd.c: PIM BFD handling routines
   3  *
   4  * Copyright (C) 2017 Cumulus Networks, Inc.
   5  * Chirag Shah
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; see the file COPYING; if not, write to the
  19  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  20  * MA 02110-1301 USA
  21  */
  22
  23 #include <zebra.h>
  24
  25 #include "lib/json.h"
  26 #include "command.h"
  27 #include "vty.h"
  28 #include "zclient.h"
  29
  30 #include "pim_instance.h"
  31 #include "pim_neighbor.h"
  32 #include "pim_vty.h"
  33 #include "pim_iface.h"
  34 #include "pim_bfd.h"
  35 #include "bfd.h"
  36 #include "pimd.h"
  37 #include "pim_zebra.h"
  38
  39 /*
  40  * pim_bfd_write_config - Write the interface BFD configuration.
  41  */
  42 void pim_bfd_write_config(struct vty *vty, struct interface *ifp)
  43 {
  44         struct pim_interface *pim_ifp = ifp->info;
  45
  46         if (!pim_ifp || !pim_ifp->bfd_config.enabled)
  47                 return;
  48
  49 #if HAVE_BFDD == 0
  50         if (pim_ifp->bfd_config.detection_multiplier != BFD_DEF_DETECT_MULT
  51             || pim_ifp->bfd_config.min_rx != BFD_DEF_MIN_RX
  52             || pim_ifp->bfd_config.min_tx != BFD_DEF_MIN_TX)
  53                 vty_out(vty, " " PIM_AF_NAME " pim bfd %d %d %d\n",
  54                         pim_ifp->bfd_config.detection_multiplier,
  55                         pim_ifp->bfd_config.min_rx, pim_ifp->bfd_config.min_tx);
  56         else
  57 #endif /* ! HAVE_BFDD */
  58                 vty_out(vty, " " PIM_AF_NAME " pim bfd\n");
  59
  60         if (pim_ifp->bfd_config.profile)
  61                 vty_out(vty, " " PIM_AF_NAME " pim bfd profile %s\n",
  62                         pim_ifp->bfd_config.profile);
  63 }
  64
  65 static void pim_neighbor_bfd_cb(struct bfd_session_params *bsp,
  66                                 const struct bfd_session_status *bss, void *arg)
  67 {
  68         struct pim_neighbor *nbr = arg;
  69
  70         if (PIM_DEBUG_PIM_TRACE) {
  71                 zlog_debug("%s: status %s old_status %s", __func__,
  72                            bfd_get_status_str(bss->state),
  73                            bfd_get_status_str(bss->previous_state));
  74         }
  75
  76         if (bss->state == BFD_STATUS_DOWN
  77             && bss->previous_state == BFD_STATUS_UP)
  78                 pim_neighbor_delete(nbr->interface, nbr, "BFD Session Expired");
  79 }
  80
  81 /*
  82  * pim_bfd_info_nbr_create - Create/update BFD information for a neighbor.
  83  */
  84 void pim_bfd_info_nbr_create(struct pim_interface *pim_ifp,
  85                              struct pim_neighbor *neigh)
  86 {
  87         /* Check if Pim Interface BFD is enabled */
  88         if (!pim_ifp || !pim_ifp->bfd_config.enabled)
  89                 return;
  90
  91         if (neigh->bfd_session == NULL)
  92                 neigh->bfd_session = bfd_sess_new(pim_neighbor_bfd_cb, neigh);
  93
  94         bfd_sess_set_timers(
  95                 neigh->bfd_session, pim_ifp->bfd_config.detection_multiplier,
  96                 pim_ifp->bfd_config.min_rx, pim_ifp->bfd_config.min_tx);
  97 #if PIM_IPV == 4
  98         bfd_sess_set_ipv4_addrs(neigh->bfd_session, NULL, &neigh->source_addr);
  99 #else
 100         bfd_sess_set_ipv6_addrs(neigh->bfd_session, NULL, &neigh->source_addr);
 101 #endif
 102         bfd_sess_set_interface(neigh->bfd_session, neigh->interface->name);
 103         bfd_sess_set_vrf(neigh->bfd_session, neigh->interface->vrf->vrf_id);
 104         bfd_sess_set_profile(neigh->bfd_session, pim_ifp->bfd_config.profile);
 105         bfd_sess_install(neigh->bfd_session);
 106 }
 107
 108 /*
 109  * pim_bfd_reg_dereg_all_nbr - Register/Deregister all neighbors associated
 110  *                              with a interface with BFD through
 111  *                              zebra for starting/stopping the monitoring of
 112  *                              the neighbor rechahability.
 113  */
 114 void pim_bfd_reg_dereg_all_nbr(struct interface *ifp)
 115 {
 116         struct pim_interface *pim_ifp = NULL;
 117         struct listnode *node = NULL;
 118         struct pim_neighbor *neigh = NULL;
 119
 120         pim_ifp = ifp->info;
 121         if (!pim_ifp)
 122                 return;
 123
 124         for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) {
 125                 if (pim_ifp->bfd_config.enabled)
 126                         pim_bfd_info_nbr_create(pim_ifp, neigh);
 127                 else
 128                         bfd_sess_free(&neigh->bfd_session);
 129         }
 130 }
 131
 132 void pim_bfd_init(void)
 133 {
 134         bfd_protocol_integration_init(pim_zebra_zclient_get(), router->master);
 135 }