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