pimd/pim_bfd.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * pim_bfd.c: PIM BFD handling routines
   4  *
   5  * Copyright (C) 2017 Cumulus Networks, Inc.
   6  * Chirag Shah
   7  */
   8
   9 #include <zebra.h>
  10
  11 #include "lib/json.h"
  12 #include "command.h"
  13 #include "vty.h"
  14 #include "zclient.h"
  15
  16 #include "pim_instance.h"
  17 #include "pim_neighbor.h"
  18 #include "pim_vty.h"
  19 #include "pim_iface.h"
  20 #include "pim_bfd.h"
  21 #include "bfd.h"
  22 #include "pimd.h"
  23 #include "pim_zebra.h"
  24
  25 /*
  26  * pim_bfd_write_config - Write the interface BFD configuration.
  27  */
  28 void pim_bfd_write_config(struct vty *vty, struct interface *ifp)
  29 {
  30         struct pim_interface *pim_ifp = ifp->info;
  31
  32         if (!pim_ifp || !pim_ifp->bfd_config.enabled)
  33                 return;
  34
  35 #if HAVE_BFDD == 0
  36         if (pim_ifp->bfd_config.detection_multiplier != BFD_DEF_DETECT_MULT
  37             || pim_ifp->bfd_config.min_rx != BFD_DEF_MIN_RX
  38             || pim_ifp->bfd_config.min_tx != BFD_DEF_MIN_TX)
  39                 vty_out(vty, " " PIM_AF_NAME " pim bfd %d %d %d\n",
  40                         pim_ifp->bfd_config.detection_multiplier,
  41                         pim_ifp->bfd_config.min_rx, pim_ifp->bfd_config.min_tx);
  42         else
  43 #endif /* ! HAVE_BFDD */
  44                 vty_out(vty, " " PIM_AF_NAME " pim bfd\n");
  45
  46         if (pim_ifp->bfd_config.profile)
  47                 vty_out(vty, " " PIM_AF_NAME " pim bfd profile %s\n",
  48                         pim_ifp->bfd_config.profile);
  49 }
  50
  51 static void pim_neighbor_bfd_cb(struct bfd_session_params *bsp,
  52                                 const struct bfd_session_status *bss, void *arg)
  53 {
  54         struct pim_neighbor *nbr = arg;
  55
  56         if (PIM_DEBUG_PIM_TRACE) {
  57                 zlog_debug("%s: status %s old_status %s", __func__,
  58                            bfd_get_status_str(bss->state),
  59                            bfd_get_status_str(bss->previous_state));
  60         }
  61
  62         if (bss->state == BFD_STATUS_DOWN
  63             && bss->previous_state == BFD_STATUS_UP)
  64                 pim_neighbor_delete(nbr->interface, nbr, "BFD Session Expired");
  65 }
  66
  67 /*
  68  * pim_bfd_info_nbr_create - Create/update BFD information for a neighbor.
  69  */
  70 void pim_bfd_info_nbr_create(struct pim_interface *pim_ifp,
  71                              struct pim_neighbor *neigh)
  72 {
  73         /* Check if Pim Interface BFD is enabled */
  74         if (!pim_ifp || !pim_ifp->bfd_config.enabled)
  75                 return;
  76
  77         if (neigh->bfd_session == NULL)
  78                 neigh->bfd_session = bfd_sess_new(pim_neighbor_bfd_cb, neigh);
  79
  80         bfd_sess_set_timers(
  81                 neigh->bfd_session, pim_ifp->bfd_config.detection_multiplier,
  82                 pim_ifp->bfd_config.min_rx, pim_ifp->bfd_config.min_tx);
  83 #if PIM_IPV == 4
  84         bfd_sess_set_ipv4_addrs(neigh->bfd_session, NULL, &neigh->source_addr);
  85 #else
  86         bfd_sess_set_ipv6_addrs(neigh->bfd_session, NULL, &neigh->source_addr);
  87 #endif
  88         bfd_sess_set_interface(neigh->bfd_session, neigh->interface->name);
  89         bfd_sess_set_vrf(neigh->bfd_session, neigh->interface->vrf->vrf_id);
  90         bfd_sess_set_profile(neigh->bfd_session, pim_ifp->bfd_config.profile);
  91         bfd_sess_install(neigh->bfd_session);
  92 }
  93
  94 /*
  95  * pim_bfd_reg_dereg_all_nbr - Register/Deregister all neighbors associated
  96  *                              with a interface with BFD through
  97  *                              zebra for starting/stopping the monitoring of
  98  *                              the neighbor rechahability.
  99  */
 100 void pim_bfd_reg_dereg_all_nbr(struct interface *ifp)
 101 {
 102         struct pim_interface *pim_ifp = NULL;
 103         struct listnode *node = NULL;
 104         struct pim_neighbor *neigh = NULL;
 105
 106         pim_ifp = ifp->info;
 107         if (!pim_ifp)
 108                 return;
 109
 110         for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) {
 111                 if (pim_ifp->bfd_config.enabled)
 112                         pim_bfd_info_nbr_create(pim_ifp, neigh);
 113                 else
 114                         bfd_sess_free(&neigh->bfd_session);
 115         }
 116 }
 117
 118 void pim_bfd_init(void)
 119 {
 120         bfd_protocol_integration_init(pim_zebra_zclient_get(), router->master);
 121 }