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_cmd.h"
  33 #include "pim_vty.h"
  34 #include "pim_iface.h"
  35 #include "pim_bfd.h"
  36 #include "bfd.h"
  37 #include "pimd.h"
  38 #include "pim_zebra.h"
  39
  40 /*
  41  * pim_bfd_write_config - Write the interface BFD configuration.
  42  */
  43 void pim_bfd_write_config(struct vty *vty, struct interface *ifp)
  44 {
  45         struct pim_interface *pim_ifp = ifp->info;
  46
  47         if (!pim_ifp || !pim_ifp->bfd_config.enabled)
  48                 return;
  49
  50 #if HAVE_BFDD == 0
  51         if (pim_ifp->bfd_config.detection_multiplier != BFD_DEF_DETECT_MULT
  52             || pim_ifp->bfd_config.min_rx != BFD_DEF_MIN_RX
  53             || pim_ifp->bfd_config.min_tx != BFD_DEF_MIN_TX)
  54                 vty_out(vty, " ip pim bfd %d %d %d\n",
  55                         pim_ifp->bfd_config.detection_multiplier,
  56                         pim_ifp->bfd_config.min_rx, pim_ifp->bfd_config.min_tx);
  57         else
  58 #endif /* ! HAVE_BFDD */
  59                 vty_out(vty, " ip pim bfd\n");
  60
  61         if (pim_ifp->bfd_config.profile)
  62                 vty_out(vty, " ip pim bfd profile %s\n",
  63                         pim_ifp->bfd_config.profile);
  64 }
  65
  66 static void pim_neighbor_bfd_cb(struct bfd_session_params *bsp,
  67                                 const struct bfd_session_status *bss, void *arg)
  68 {
  69         struct pim_neighbor *nbr = arg;
  70
  71         if (PIM_DEBUG_PIM_TRACE) {
  72                 zlog_debug("%s: status %s old_status %s", __func__,
  73                            bfd_get_status_str(bss->state),
  74                            bfd_get_status_str(bss->previous_state));
  75         }
  76
  77         if (bss->state == BFD_STATUS_DOWN
  78             && bss->previous_state == BFD_STATUS_UP)
  79                 pim_neighbor_delete(nbr->interface, nbr, "BFD Session Expired");
  80 }
  81
  82 /*
  83  * pim_bfd_info_nbr_create - Create/update BFD information for a neighbor.
  84  */
  85 void pim_bfd_info_nbr_create(struct pim_interface *pim_ifp,
  86                              struct pim_neighbor *neigh)
  87 {
  88         /* Check if Pim Interface BFD is enabled */
  89         if (!pim_ifp || !pim_ifp->bfd_config.enabled)
  90                 return;
  91
  92         if (neigh->bfd_session == NULL)
  93                 neigh->bfd_session = bfd_sess_new(pim_neighbor_bfd_cb, neigh);
  94
  95         bfd_sess_set_timers(
  96                 neigh->bfd_session, pim_ifp->bfd_config.detection_multiplier,
  97                 pim_ifp->bfd_config.min_rx, pim_ifp->bfd_config.min_tx);
  98         bfd_sess_set_ipv4_addrs(neigh->bfd_session, NULL, &neigh->source_addr);
  99         bfd_sess_set_interface(neigh->bfd_session, neigh->interface->name);
 100         bfd_sess_set_vrf(neigh->bfd_session, neigh->interface->vrf->vrf_id);
 101         bfd_sess_set_profile(neigh->bfd_session, pim_ifp->bfd_config.profile);
 102         bfd_sess_install(neigh->bfd_session);
 103 }
 104
 105 /*
 106  * pim_bfd_reg_dereg_all_nbr - Register/Deregister all neighbors associated
 107  *                              with a interface with BFD through
 108  *                              zebra for starting/stopping the monitoring of
 109  *                              the neighbor rechahability.
 110  */
 111 void pim_bfd_reg_dereg_all_nbr(struct interface *ifp)
 112 {
 113         struct pim_interface *pim_ifp = NULL;
 114         struct listnode *node = NULL;
 115         struct pim_neighbor *neigh = NULL;
 116
 117         pim_ifp = ifp->info;
 118         if (!pim_ifp)
 119                 return;
 120
 121         for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) {
 122                 if (pim_ifp->bfd_config.enabled)
 123                         pim_bfd_info_nbr_create(pim_ifp, neigh);
 124                 else
 125                         bfd_sess_free(&neigh->bfd_session);
 126         }
 127 }
 128
 129 void pim_bfd_init(void)
 130 {
 131         bfd_protocol_integration_init(pim_zebra_zclient_get(), router->master);
 132 }