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136 lines
4.1 KiB
C
136 lines
4.1 KiB
C
/*
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* pim_bfd.c: PIM BFD handling routines
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*
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* Copyright (C) 2017 Cumulus Networks, Inc.
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* Chirag Shah
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include <zebra.h>
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#include "lib/json.h"
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#include "command.h"
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#include "vty.h"
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#include "zclient.h"
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#include "pim_instance.h"
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#include "pim_neighbor.h"
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#include "pim_vty.h"
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#include "pim_iface.h"
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#include "pim_bfd.h"
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#include "bfd.h"
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#include "pimd.h"
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#include "pim_zebra.h"
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/*
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* pim_bfd_write_config - Write the interface BFD configuration.
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*/
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void pim_bfd_write_config(struct vty *vty, struct interface *ifp)
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{
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struct pim_interface *pim_ifp = ifp->info;
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if (!pim_ifp || !pim_ifp->bfd_config.enabled)
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return;
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#if HAVE_BFDD == 0
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if (pim_ifp->bfd_config.detection_multiplier != BFD_DEF_DETECT_MULT
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|| pim_ifp->bfd_config.min_rx != BFD_DEF_MIN_RX
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|| pim_ifp->bfd_config.min_tx != BFD_DEF_MIN_TX)
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vty_out(vty, " " PIM_AF_NAME " pim bfd %d %d %d\n",
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pim_ifp->bfd_config.detection_multiplier,
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pim_ifp->bfd_config.min_rx, pim_ifp->bfd_config.min_tx);
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else
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#endif /* ! HAVE_BFDD */
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vty_out(vty, " " PIM_AF_NAME " pim bfd\n");
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if (pim_ifp->bfd_config.profile)
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vty_out(vty, " " PIM_AF_NAME " pim bfd profile %s\n",
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pim_ifp->bfd_config.profile);
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}
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static void pim_neighbor_bfd_cb(struct bfd_session_params *bsp,
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const struct bfd_session_status *bss, void *arg)
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{
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struct pim_neighbor *nbr = arg;
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if (PIM_DEBUG_PIM_TRACE) {
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zlog_debug("%s: status %s old_status %s", __func__,
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bfd_get_status_str(bss->state),
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bfd_get_status_str(bss->previous_state));
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}
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if (bss->state == BFD_STATUS_DOWN
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&& bss->previous_state == BFD_STATUS_UP)
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pim_neighbor_delete(nbr->interface, nbr, "BFD Session Expired");
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}
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/*
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* pim_bfd_info_nbr_create - Create/update BFD information for a neighbor.
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*/
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void pim_bfd_info_nbr_create(struct pim_interface *pim_ifp,
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struct pim_neighbor *neigh)
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{
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/* Check if Pim Interface BFD is enabled */
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if (!pim_ifp || !pim_ifp->bfd_config.enabled)
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return;
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if (neigh->bfd_session == NULL)
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neigh->bfd_session = bfd_sess_new(pim_neighbor_bfd_cb, neigh);
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bfd_sess_set_timers(
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neigh->bfd_session, pim_ifp->bfd_config.detection_multiplier,
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pim_ifp->bfd_config.min_rx, pim_ifp->bfd_config.min_tx);
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#if PIM_IPV == 4
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bfd_sess_set_ipv4_addrs(neigh->bfd_session, NULL, &neigh->source_addr);
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#else
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bfd_sess_set_ipv6_addrs(neigh->bfd_session, NULL, &neigh->source_addr);
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#endif
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bfd_sess_set_interface(neigh->bfd_session, neigh->interface->name);
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bfd_sess_set_vrf(neigh->bfd_session, neigh->interface->vrf->vrf_id);
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bfd_sess_set_profile(neigh->bfd_session, pim_ifp->bfd_config.profile);
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bfd_sess_install(neigh->bfd_session);
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}
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/*
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* pim_bfd_reg_dereg_all_nbr - Register/Deregister all neighbors associated
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* with a interface with BFD through
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* zebra for starting/stopping the monitoring of
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* the neighbor rechahability.
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*/
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void pim_bfd_reg_dereg_all_nbr(struct interface *ifp)
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{
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struct pim_interface *pim_ifp = NULL;
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struct listnode *node = NULL;
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struct pim_neighbor *neigh = NULL;
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pim_ifp = ifp->info;
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if (!pim_ifp)
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return;
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for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) {
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if (pim_ifp->bfd_config.enabled)
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pim_bfd_info_nbr_create(pim_ifp, neigh);
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else
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bfd_sess_free(&neigh->bfd_session);
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}
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}
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void pim_bfd_init(void)
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{
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bfd_protocol_integration_init(pim_zebra_zclient_get(), router->master);
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}
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