[mirror_frr.git] / ospfd / ospf_bfd.c

/**
 * ospf_bfd.c: OSPF BFD handling routines
 *
 * @copyright Copyright (C) 2015 Cumulus Networks, Inc.
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra 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, or (at your option) any
 * later version.
 *
 * GNU Zebra 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 "command.h"
#include "linklist.h"
#include "memory.h"
#include "prefix.h"
#include "thread.h"
#include "buffer.h"
#include "stream.h"
#include "zclient.h"
#include "vty.h"
#include "table.h"
#include "bfd.h"
#include "ospfd.h"
#include "ospf_asbr.h"
#include "ospf_lsa.h"
#include "ospf_lsdb.h"
#include "ospf_neighbor.h"
#include "ospf_interface.h"
#include "ospf_nsm.h"
#include "ospf_bfd.h"
#include "ospf_dump.h"
#include "ospf_vty.h"

extern struct zclient *zclient;

/*
 * ospf_bfd_info_free - Free BFD info structure
 */
void ospf_bfd_info_free(void **bfd_info)
{
	bfd_info_free((struct bfd_info **)bfd_info);
}

/*
 * ospf_bfd_reg_dereg_nbr - Register/Deregister a neighbor with BFD through
 *                          zebra for starting/stopping the monitoring of
 *                          the neighbor rechahability.
 */
static void ospf_bfd_reg_dereg_nbr(struct ospf_neighbor *nbr, int command)
{
	struct ospf_interface *oi = nbr->oi;
	struct interface *ifp = oi->ifp;
	struct ospf_if_params *params;
	struct bfd_info *bfd_info;

	/* Check if BFD is enabled */
	params = IF_DEF_PARAMS(ifp);

	/* Check if BFD is enabled */
	if (!params->bfd_info)
		return;
	bfd_info = (struct bfd_info *)params->bfd_info;

	if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE))
		zlog_debug("%s nbr (%s) with BFD. OSPF vrf %s",
			   bfd_get_command_dbg_str(command),
			   inet_ntoa(nbr->src),
			   ospf_vrf_id_to_name(oi->ospf->vrf_id));

	bfd_peer_sendmsg(zclient, bfd_info, AF_INET, &nbr->src, NULL, ifp->name,
			 0, 0, command, 0, oi->ospf->vrf_id);
}

/*
 * ospf_bfd_trigger_event - Neighbor is registered/deregistered with BFD when
 *                          neighbor state is changed to/from 2way.
 */
void ospf_bfd_trigger_event(struct ospf_neighbor *nbr, int old_state, int state)
{
	if ((old_state < NSM_TwoWay) && (state >= NSM_TwoWay))
		ospf_bfd_reg_dereg_nbr(nbr, ZEBRA_BFD_DEST_REGISTER);
	else if ((old_state >= NSM_TwoWay) && (state < NSM_TwoWay))
		ospf_bfd_reg_dereg_nbr(nbr, ZEBRA_BFD_DEST_DEREGISTER);
}

/*
 * ospf_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.
 */
static int ospf_bfd_reg_dereg_all_nbr(struct interface *ifp, int command)
{
	struct ospf_interface *oi;
	struct route_table *nbrs;
	struct ospf_neighbor *nbr;
	struct route_node *irn;
	struct route_node *nrn;

	for (irn = route_top(IF_OIFS(ifp)); irn; irn = route_next(irn)) {
		if ((oi = irn->info) == NULL)
			continue;

		if ((nbrs = oi->nbrs) == NULL)
			continue;

		for (nrn = route_top(nbrs); nrn; nrn = route_next(nrn)) {
			if ((nbr = nrn->info) == NULL || nbr == oi->nbr_self)
				continue;

			if (command != ZEBRA_BFD_DEST_DEREGISTER)
				ospf_bfd_info_nbr_create(oi, nbr);
			else
				bfd_info_free(
					(struct bfd_info **)&nbr->bfd_info);

			if (nbr->state < NSM_TwoWay)
				continue;

			ospf_bfd_reg_dereg_nbr(nbr, command);
		}
	}

	return 0;
}

/*
 * ospf_bfd_nbr_replay - Replay all the neighbors that have BFD enabled
 *                       to zebra
 */
static int ospf_bfd_nbr_replay(int command, struct zclient *zclient,
			       zebra_size_t length, vrf_id_t vrf_id)
{
	struct listnode *inode, *node, *onode;
	struct ospf *ospf;
	struct ospf_interface *oi;
	struct route_table *nbrs;
	struct route_node *rn;
	struct ospf_neighbor *nbr;
	struct ospf_if_params *params;

	if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE)) {
		zlog_debug("Zebra: BFD Dest replay request");
	}

	/* Send the client registration */
	bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER);

	/* Replay the neighbor, if BFD is enabled in OSPF */
	for (ALL_LIST_ELEMENTS(om->ospf, node, onode, ospf)) {
		for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, inode, oi)) {
			if ((nbrs = oi->nbrs) == NULL)
				continue;

			params = IF_DEF_PARAMS(oi->ifp);
			if (!params->bfd_info)
				continue;

			for (rn = route_top(nbrs); rn; rn = route_next(rn)) {
				if ((nbr = rn->info) == NULL
				    || nbr == oi->nbr_self)
					continue;

				if (nbr->state < NSM_TwoWay)
					continue;

				if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE))
					zlog_debug("Replaying nbr (%s) to BFD",
						   inet_ntoa(nbr->src));

				ospf_bfd_reg_dereg_nbr(nbr,
						       ZEBRA_BFD_DEST_UPDATE);
			}
		}
	}
	return 0;
}

/*
 * ospf_bfd_interface_dest_update - Find the neighbor for which the BFD status
 *                                  has changed and bring down the neighbor
 *                                  connectivity if the BFD status changed to
 *                                  down.
 */
static int ospf_bfd_interface_dest_update(int command, struct zclient *zclient,
					  zebra_size_t length, vrf_id_t vrf_id)
{
	struct interface *ifp;
	struct ospf_interface *oi;
	struct ospf_if_params *params;
	struct ospf_neighbor *nbr;
	struct route_node *node;
	struct prefix p;
	int status;
	int old_status;
	struct bfd_info *bfd_info;
	struct timeval tv;

	ifp = bfd_get_peer_info(zclient->ibuf, &p, NULL, &status, vrf_id);

	if ((ifp == NULL) || (p.family != AF_INET))
		return 0;

	if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE)) {
		char buf[PREFIX2STR_BUFFER];
		prefix2str(&p, buf, sizeof(buf));
		zlog_debug("Zebra: interface %s bfd destination %s %s",
			   ifp->name, buf, bfd_get_status_str(status));
	}

	params = IF_DEF_PARAMS(ifp);
	if (!params->bfd_info)
		return 0;

	for (node = route_top(IF_OIFS(ifp)); node; node = route_next(node)) {
		if ((oi = node->info) == NULL)
			continue;

		nbr = ospf_nbr_lookup_by_addr(oi->nbrs, &p.u.prefix4);
		if (!nbr || !nbr->bfd_info)
			continue;

		bfd_info = (struct bfd_info *)nbr->bfd_info;
		if (bfd_info->status == status)
			continue;

		old_status = bfd_info->status;
		bfd_info->status = status;
		monotime(&tv);
		bfd_info->last_update = tv.tv_sec;

		if ((status == BFD_STATUS_DOWN)
		    && (old_status == BFD_STATUS_UP)) {
			if (IS_DEBUG_OSPF(nsm, NSM_EVENTS))
				zlog_debug("NSM[%s:%s]: BFD Down",
					   IF_NAME(nbr->oi),
					   inet_ntoa(nbr->address.u.prefix4));

			OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_InactivityTimer);
		}
	}

	return 0;
}

/*
 * ospf_bfd_info_nbr_create - Create/update BFD information for a neighbor.
 */
void ospf_bfd_info_nbr_create(struct ospf_interface *oi,
			      struct ospf_neighbor *nbr)
{
	struct bfd_info *oi_bfd_info;
	struct bfd_info *nbr_bfd_info;
	struct interface *ifp = oi->ifp;
	struct ospf_if_params *params;

	/* Check if BFD is enabled */
	params = IF_DEF_PARAMS(ifp);

	/* Check if BFD is enabled */
	if (!params->bfd_info)
		return;

	oi_bfd_info = (struct bfd_info *)params->bfd_info;
	if (!nbr->bfd_info)
		nbr->bfd_info = bfd_info_create();

	nbr_bfd_info = (struct bfd_info *)nbr->bfd_info;
	nbr_bfd_info->detect_mult = oi_bfd_info->detect_mult;
	nbr_bfd_info->desired_min_tx = oi_bfd_info->desired_min_tx;
	nbr_bfd_info->required_min_rx = oi_bfd_info->required_min_rx;
}

/*
 * ospf_bfd_write_config - Write the interface BFD configuration.
 */
void ospf_bfd_write_config(struct vty *vty, struct ospf_if_params *params)

{
#if HAVE_BFDD == 0
	struct bfd_info *bfd_info;
#endif /* ! HAVE_BFDD */

	if (!params->bfd_info)
		return;

#if HAVE_BFDD == 0
	bfd_info = (struct bfd_info *)params->bfd_info;

	if (CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG))
		vty_out(vty, " ip ospf bfd %d %d %d\n", bfd_info->detect_mult,
			bfd_info->required_min_rx, bfd_info->desired_min_tx);
	else
#endif /* ! HAVE_BFDD */
		vty_out(vty, " ip ospf bfd\n");
}

/*
 * ospf_bfd_show_info - Show BFD info structure
 */
void ospf_bfd_show_info(struct vty *vty, void *bfd_info, json_object *json_obj,
			bool use_json, int param_only)
{
	if (param_only)
		bfd_show_param(vty, (struct bfd_info *)bfd_info, 1, 0, use_json,
			       json_obj);
	else
		bfd_show_info(vty, (struct bfd_info *)bfd_info, 0, 1, use_json,
			      json_obj);
}

/*
 * ospf_bfd_interface_show - Show the interface BFD configuration.
 */
void ospf_bfd_interface_show(struct vty *vty, struct interface *ifp,
			     json_object *json_interface_sub, bool use_json)
{
	struct ospf_if_params *params;

	params = IF_DEF_PARAMS(ifp);

	ospf_bfd_show_info(vty, params->bfd_info, json_interface_sub, use_json,
			   1);
}

/*
 * ospf_bfd_if_param_set - Set the configured BFD paramter values for
 *                         interface.
 */
static void ospf_bfd_if_param_set(struct interface *ifp, uint32_t min_rx,
				  uint32_t min_tx, uint8_t detect_mult,
				  int defaults)
{
	struct ospf_if_params *params;
	int command = 0;

	params = IF_DEF_PARAMS(ifp);

	bfd_set_param((struct bfd_info **)&(params->bfd_info), min_rx, min_tx,
		      detect_mult, defaults, &command);
	if (command)
		ospf_bfd_reg_dereg_all_nbr(ifp, command);
}

DEFUN (ip_ospf_bfd,
       ip_ospf_bfd_cmd,
       "ip ospf bfd",
       "IP Information\n"
       "OSPF interface commands\n"
       "Enables BFD support\n")
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	struct ospf_if_params *params;
	struct bfd_info *bfd_info;

	assert(ifp);
	params = IF_DEF_PARAMS(ifp);
	bfd_info = params->bfd_info;

	if (!bfd_info || !CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG))
		ospf_bfd_if_param_set(ifp, BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
				      BFD_DEF_DETECT_MULT, 1);

	return CMD_SUCCESS;
}

#if HAVE_BFDD > 0
DEFUN_HIDDEN(
#else
DEFUN(
#endif /* HAVE_BFDD */
       ip_ospf_bfd_param,
       ip_ospf_bfd_param_cmd,
       "ip ospf bfd (2-255) (50-60000) (50-60000)",
       "IP Information\n"
       "OSPF interface commands\n"
       "Enables BFD support\n"
       "Detect Multiplier\n"
       "Required min receive interval\n"
       "Desired min transmit interval\n")
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	int idx_number = 3;
	int idx_number_2 = 4;
	int idx_number_3 = 5;
	uint32_t rx_val;
	uint32_t tx_val;
	uint8_t dm_val;
	int ret;

	assert(ifp);

	if ((ret = bfd_validate_param(
		     vty, argv[idx_number]->arg, argv[idx_number_2]->arg,
		     argv[idx_number_3]->arg, &dm_val, &rx_val, &tx_val))
	    != CMD_SUCCESS)
		return ret;

	ospf_bfd_if_param_set(ifp, rx_val, tx_val, dm_val, 0);

	return CMD_SUCCESS;
}

DEFUN (no_ip_ospf_bfd,
       no_ip_ospf_bfd_cmd,
#if HAVE_BFDD > 0
       "no ip ospf bfd",
#else
       "no ip ospf bfd [(2-255) (50-60000) (50-60000)]",
#endif /* HAVE_BFDD */
       NO_STR
       "IP Information\n"
       "OSPF interface commands\n"
       "Disables BFD support\n"
#if HAVE_BFDD == 0
       "Detect Multiplier\n"
       "Required min receive interval\n"
       "Desired min transmit interval\n"
#endif /* !HAVE_BFDD */
)
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	struct ospf_if_params *params;

	assert(ifp);

	params = IF_DEF_PARAMS(ifp);
	if (params->bfd_info) {
		ospf_bfd_reg_dereg_all_nbr(ifp, ZEBRA_BFD_DEST_DEREGISTER);
		bfd_info_free(&(params->bfd_info));
	}

	return CMD_SUCCESS;
}

void ospf_bfd_init(void)
{
	bfd_gbl_init();

	/* Initialize BFD client functions */
	zclient->interface_bfd_dest_update = ospf_bfd_interface_dest_update;
	zclient->bfd_dest_replay = ospf_bfd_nbr_replay;

	/* Install BFD command */
	install_element(INTERFACE_NODE, &ip_ospf_bfd_cmd);
	install_element(INTERFACE_NODE, &ip_ospf_bfd_param_cmd);
	install_element(INTERFACE_NODE, &no_ip_ospf_bfd_cmd);
}
Commit	Line	Data
7f342629 DS	1	/**
	2	* ospf_bfd.c: OSPF BFD handling routines
	3	*
	4	* @copyright Copyright (C) 2015 Cumulus Networks, Inc.
	5	*
	6	* This file is part of GNU Zebra.
	7	*
	8	* GNU Zebra is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2, or (at your option) any
	11	* later version.
	12	*
	13	* GNU Zebra is distributed in the hope that it will be useful, but
	14	* WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* General Public License for more details.
	17	*
896014f4 DL	18	* You should have received a copy of the GNU General Public License along
	19	* with this program; see the file COPYING; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
7f342629 DS	21	*/
	22
	23	#include <zebra.h>
	24
	25	#include "command.h"
	26	#include "linklist.h"
	27	#include "memory.h"
	28	#include "prefix.h"
	29	#include "thread.h"
	30	#include "buffer.h"
	31	#include "stream.h"
	32	#include "zclient.h"
	33	#include "vty.h"
	34	#include "table.h"
	35	#include "bfd.h"
	36	#include "ospfd.h"
	37	#include "ospf_asbr.h"
	38	#include "ospf_lsa.h"
	39	#include "ospf_lsdb.h"
	40	#include "ospf_neighbor.h"
	41	#include "ospf_interface.h"
	42	#include "ospf_nsm.h"
	43	#include "ospf_bfd.h"
	44	#include "ospf_dump.h"
	45	#include "ospf_vty.h"
	46
	47	extern struct zclient *zclient;
	48
68fe91d6	49	/*
	50	* ospf_bfd_info_free - Free BFD info structure
	51	*/
d62a17ae	52	void ospf_bfd_info_free(void **bfd_info)
68fe91d6	53	{
d62a17ae	54	bfd_info_free((struct bfd_info **)bfd_info);
68fe91d6	55	}
68fe91d6	56
7f342629 DS	57	/*
	58	* ospf_bfd_reg_dereg_nbr - Register/Deregister a neighbor with BFD through
	59	* zebra for starting/stopping the monitoring of
	60	* the neighbor rechahability.
	61	*/
d62a17ae	62	static void ospf_bfd_reg_dereg_nbr(struct ospf_neighbor *nbr, int command)
7f342629	63	{
d62a17ae	64	struct ospf_interface *oi = nbr->oi;
	65	struct interface *ifp = oi->ifp;
	66	struct ospf_if_params *params;
	67	struct bfd_info *bfd_info;
	68
	69	/* Check if BFD is enabled */
	70	params = IF_DEF_PARAMS(ifp);
	71
	72	/* Check if BFD is enabled */
	73	if (!params->bfd_info)
	74	return;
	75	bfd_info = (struct bfd_info *)params->bfd_info;
	76
	77	if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE))
b5a8894d	78	zlog_debug("%s nbr (%s) with BFD. OSPF vrf %s",
d62a17ae	79	bfd_get_command_dbg_str(command),
b5a8894d CS	80	inet_ntoa(nbr->src),
b5a8894d CS	81	ospf_vrf_id_to_name(oi->ospf->vrf_id));
d62a17ae	82
d62a17ae	83	bfd_peer_sendmsg(zclient, bfd_info, AF_INET, &nbr->src, NULL, ifp->name,
b5a8894d	84	0, 0, command, 0, oi->ospf->vrf_id);
7f342629 DS	85	}
	86
	87	/*
	88	* ospf_bfd_trigger_event - Neighbor is registered/deregistered with BFD when
	89	* neighbor state is changed to/from 2way.
	90	*/
d62a17ae	91	void ospf_bfd_trigger_event(struct ospf_neighbor *nbr, int old_state, int state)
7f342629	92	{
d62a17ae	93	if ((old_state < NSM_TwoWay) && (state >= NSM_TwoWay))
	94	ospf_bfd_reg_dereg_nbr(nbr, ZEBRA_BFD_DEST_REGISTER);
	95	else if ((old_state >= NSM_TwoWay) && (state < NSM_TwoWay))
	96	ospf_bfd_reg_dereg_nbr(nbr, ZEBRA_BFD_DEST_DEREGISTER);
7f342629 DS	97	}
	98
	99	/*
	100	* ospf_bfd_reg_dereg_all_nbr - Register/Deregister all neighbors associated
	101	* with a interface with BFD through
	102	* zebra for starting/stopping the monitoring of
	103	* the neighbor rechahability.
	104	*/
d62a17ae	105	static int ospf_bfd_reg_dereg_all_nbr(struct interface *ifp, int command)
7f342629	106	{
d62a17ae	107	struct ospf_interface *oi;
	108	struct route_table *nbrs;
	109	struct ospf_neighbor *nbr;
	110	struct route_node *irn;
	111	struct route_node *nrn;
	112
	113	for (irn = route_top(IF_OIFS(ifp)); irn; irn = route_next(irn)) {
	114	if ((oi = irn->info) == NULL)
	115	continue;
	116
	117	if ((nbrs = oi->nbrs) == NULL)
	118	continue;
	119
	120	for (nrn = route_top(nbrs); nrn; nrn = route_next(nrn)) {
	121	if ((nbr = nrn->info) == NULL \|\| nbr == oi->nbr_self)
	122	continue;
	123
	124	if (command != ZEBRA_BFD_DEST_DEREGISTER)
	125	ospf_bfd_info_nbr_create(oi, nbr);
	126	else
	127	bfd_info_free(
	128	(struct bfd_info **)&nbr->bfd_info);
	129
	130	if (nbr->state < NSM_TwoWay)
	131	continue;
	132
	133	ospf_bfd_reg_dereg_nbr(nbr, command);
	134	}
	135	}
	136
	137	return 0;
7f342629 DS	138	}
	139
	140	/*
	141	* ospf_bfd_nbr_replay - Replay all the neighbors that have BFD enabled
	142	* to zebra
	143	*/
d62a17ae	144	static int ospf_bfd_nbr_replay(int command, struct zclient *zclient,
d62a17ae	145	zebra_size_t length, vrf_id_t vrf_id)
7f342629	146	{
d62a17ae	147	struct listnode inode, node, *onode;
	148	struct ospf *ospf;
	149	struct ospf_interface *oi;
	150	struct route_table *nbrs;
	151	struct route_node *rn;
	152	struct ospf_neighbor *nbr;
	153	struct ospf_if_params *params;
	154
	155	if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE)) {
	156	zlog_debug("Zebra: BFD Dest replay request");
	157	}
	158
	159	/* Send the client registration */
	160	bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER);
	161
b5a8894d	162	/* Replay the neighbor, if BFD is enabled in OSPF */
d62a17ae	163	for (ALL_LIST_ELEMENTS(om->ospf, node, onode, ospf)) {
	164	for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, inode, oi)) {
	165	if ((nbrs = oi->nbrs) == NULL)
	166	continue;
	167
	168	params = IF_DEF_PARAMS(oi->ifp);
	169	if (!params->bfd_info)
	170	continue;
	171
	172	for (rn = route_top(nbrs); rn; rn = route_next(rn)) {
	173	if ((nbr = rn->info) == NULL
	174	\|\| nbr == oi->nbr_self)
	175	continue;
	176
	177	if (nbr->state < NSM_TwoWay)
	178	continue;
	179
	180	if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE))
	181	zlog_debug("Replaying nbr (%s) to BFD",
	182	inet_ntoa(nbr->src));
	183
	184	ospf_bfd_reg_dereg_nbr(nbr,
	185	ZEBRA_BFD_DEST_UPDATE);
	186	}
	187	}
	188	}
	189	return 0;
7f342629 DS	190	}
	191
	192	/*
68fe91d6	193	* ospf_bfd_interface_dest_update - Find the neighbor for which the BFD status
	194	* has changed and bring down the neighbor
	195	* connectivity if the BFD status changed to
	196	* down.
7f342629	197	*/
d62a17ae	198	static int ospf_bfd_interface_dest_update(int command, struct zclient *zclient,
d62a17ae	199	zebra_size_t length, vrf_id_t vrf_id)
7f342629	200	{
d62a17ae	201	struct interface *ifp;
	202	struct ospf_interface *oi;
	203	struct ospf_if_params *params;
	204	struct ospf_neighbor *nbr;
	205	struct route_node *node;
	206	struct prefix p;
	207	int status;
	208	int old_status;
	209	struct bfd_info *bfd_info;
	210	struct timeval tv;
	211
	212	ifp = bfd_get_peer_info(zclient->ibuf, &p, NULL, &status, vrf_id);
	213
	214	if ((ifp == NULL) \|\| (p.family != AF_INET))
	215	return 0;
	216
	217	if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE)) {
	218	char buf[PREFIX2STR_BUFFER];
	219	prefix2str(&p, buf, sizeof(buf));
	220	zlog_debug("Zebra: interface %s bfd destination %s %s",
	221	ifp->name, buf, bfd_get_status_str(status));
	222	}
	223
	224	params = IF_DEF_PARAMS(ifp);
	225	if (!params->bfd_info)
	226	return 0;
	227
	228	for (node = route_top(IF_OIFS(ifp)); node; node = route_next(node)) {
	229	if ((oi = node->info) == NULL)
	230	continue;
	231
	232	nbr = ospf_nbr_lookup_by_addr(oi->nbrs, &p.u.prefix4);
	233	if (!nbr \|\| !nbr->bfd_info)
	234	continue;
	235
	236	bfd_info = (struct bfd_info *)nbr->bfd_info;
	237	if (bfd_info->status == status)
	238	continue;
	239
	240	old_status = bfd_info->status;
	241	bfd_info->status = status;
	242	monotime(&tv);
	243	bfd_info->last_update = tv.tv_sec;
	244
	245	if ((status == BFD_STATUS_DOWN)
	246	&& (old_status == BFD_STATUS_UP)) {
	247	if (IS_DEBUG_OSPF(nsm, NSM_EVENTS))
	248	zlog_debug("NSM[%s:%s]: BFD Down",
	249	IF_NAME(nbr->oi),
	250	inet_ntoa(nbr->address.u.prefix4));
	251
	252	OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_InactivityTimer);
	253	}
	254	}
	255
	256	return 0;
7f342629 DS	257	}
7f342629 DS	258
68fe91d6	259	/*
	260	* ospf_bfd_info_nbr_create - Create/update BFD information for a neighbor.
	261	*/
d62a17ae	262	void ospf_bfd_info_nbr_create(struct ospf_interface *oi,
d62a17ae	263	struct ospf_neighbor *nbr)
68fe91d6	264	{
d62a17ae	265	struct bfd_info *oi_bfd_info;
	266	struct bfd_info *nbr_bfd_info;
	267	struct interface *ifp = oi->ifp;
	268	struct ospf_if_params *params;
	269
	270	/* Check if BFD is enabled */
	271	params = IF_DEF_PARAMS(ifp);
	272
	273	/* Check if BFD is enabled */
	274	if (!params->bfd_info)
	275	return;
	276
	277	oi_bfd_info = (struct bfd_info *)params->bfd_info;
	278	if (!nbr->bfd_info)
	279	nbr->bfd_info = bfd_info_create();
	280
	281	nbr_bfd_info = (struct bfd_info *)nbr->bfd_info;
	282	nbr_bfd_info->detect_mult = oi_bfd_info->detect_mult;
	283	nbr_bfd_info->desired_min_tx = oi_bfd_info->desired_min_tx;
	284	nbr_bfd_info->required_min_rx = oi_bfd_info->required_min_rx;
68fe91d6	285	}
68fe91d6	286
7f342629 DS	287	/*
	288	* ospf_bfd_write_config - Write the interface BFD configuration.
	289	*/
d62a17ae	290	void ospf_bfd_write_config(struct vty vty, struct ospf_if_params params)
7f342629 DS	291
7f342629 DS	292	{
a0841732	293	#if HAVE_BFDD == 0
d62a17ae	294	struct bfd_info *bfd_info;
a0841732	295	#endif /* ! HAVE_BFDD */
7f342629	296
d62a17ae	297	if (!params->bfd_info)
d62a17ae	298	return;
7f342629	299
a0841732	300	#if HAVE_BFDD == 0
d62a17ae	301	bfd_info = (struct bfd_info *)params->bfd_info;
7f342629	302
d62a17ae	303	if (CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG))
	304	vty_out(vty, " ip ospf bfd %d %d %d\n", bfd_info->detect_mult,
	305	bfd_info->required_min_rx, bfd_info->desired_min_tx);
	306	else
a0841732	307	#endif /* ! HAVE_BFDD */
d62a17ae	308	vty_out(vty, " ip ospf bfd\n");
7f342629 DS	309	}
7f342629 DS	310
68fe91d6	311	/*
	312	* ospf_bfd_show_info - Show BFD info structure
	313	*/
d62a17ae	314	void ospf_bfd_show_info(struct vty vty, void bfd_info, json_object *json_obj,
9f049418	315	bool use_json, int param_only)
68fe91d6	316	{
d62a17ae	317	if (param_only)
	318	bfd_show_param(vty, (struct bfd_info *)bfd_info, 1, 0, use_json,
	319	json_obj);
	320	else
	321	bfd_show_info(vty, (struct bfd_info *)bfd_info, 0, 1, use_json,
	322	json_obj);
68fe91d6	323	}
	324
	325	/*
	326	* ospf_bfd_interface_show - Show the interface BFD configuration.
	327	*/
d62a17ae	328	void ospf_bfd_interface_show(struct vty vty, struct interface ifp,
9f049418	329	json_object *json_interface_sub, bool use_json)
68fe91d6	330	{
d62a17ae	331	struct ospf_if_params *params;
68fe91d6	332
d62a17ae	333	params = IF_DEF_PARAMS(ifp);
68fe91d6	334
d62a17ae	335	ospf_bfd_show_info(vty, params->bfd_info, json_interface_sub, use_json,
d62a17ae	336	1);
68fe91d6	337	}
7f342629 DS	338
	339	/*
	340	* ospf_bfd_if_param_set - Set the configured BFD paramter values for
	341	* interface.
	342	*/
d7c0a89a QY	343	static void ospf_bfd_if_param_set(struct interface *ifp, uint32_t min_rx,
d7c0a89a QY	344	uint32_t min_tx, uint8_t detect_mult,
d62a17ae	345	int defaults)
7f342629	346	{
d62a17ae	347	struct ospf_if_params *params;
d62a17ae	348	int command = 0;
7f342629	349
d62a17ae	350	params = IF_DEF_PARAMS(ifp);
7f342629	351
d62a17ae	352	bfd_set_param((struct bfd_info **)&(params->bfd_info), min_rx, min_tx,
	353	detect_mult, defaults, &command);
	354	if (command)
	355	ospf_bfd_reg_dereg_all_nbr(ifp, command);
7f342629 DS	356	}
7f342629 DS	357
7f342629 DS	358	DEFUN (ip_ospf_bfd,
	359	ip_ospf_bfd_cmd,
	360	"ip ospf bfd",
	361	"IP Information\n"
	362	"OSPF interface commands\n"
	363	"Enables BFD support\n")
	364	{
d62a17ae	365	VTY_DECLVAR_CONTEXT(interface, ifp);
	366	struct ospf_if_params *params;
	367	struct bfd_info *bfd_info;
7f342629	368
d62a17ae	369	assert(ifp);
	370	params = IF_DEF_PARAMS(ifp);
	371	bfd_info = params->bfd_info;
487f2302	372
d62a17ae	373	if (!bfd_info \|\| !CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG))
	374	ospf_bfd_if_param_set(ifp, BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
	375	BFD_DEF_DETECT_MULT, 1);
7f342629	376
d62a17ae	377	return CMD_SUCCESS;
7f342629 DS	378	}
7f342629 DS	379
64dc4b2d RZ	380	#if HAVE_BFDD > 0
	381	DEFUN_HIDDEN(
	382	#else
	383	DEFUN(
	384	#endif /* HAVE_BFDD */
	385	ip_ospf_bfd_param,
7f342629	386	ip_ospf_bfd_param_cmd,
9ccf14f7	387	"ip ospf bfd (2-255) (50-60000) (50-60000)",
7f342629 DS	388	"IP Information\n"
	389	"OSPF interface commands\n"
	390	"Enables BFD support\n"
	391	"Detect Multiplier\n"
	392	"Required min receive interval\n"
	393	"Desired min transmit interval\n")
	394	{
d62a17ae	395	VTY_DECLVAR_CONTEXT(interface, ifp);
	396	int idx_number = 3;
	397	int idx_number_2 = 4;
	398	int idx_number_3 = 5;
d7c0a89a QY	399	uint32_t rx_val;
	400	uint32_t tx_val;
	401	uint8_t dm_val;
d62a17ae	402	int ret;
	403
	404	assert(ifp);
	405
	406	if ((ret = bfd_validate_param(
	407	vty, argv[idx_number]->arg, argv[idx_number_2]->arg,
	408	argv[idx_number_3]->arg, &dm_val, &rx_val, &tx_val))
	409	!= CMD_SUCCESS)
	410	return ret;
	411
	412	ospf_bfd_if_param_set(ifp, rx_val, tx_val, dm_val, 0);
	413
	414	return CMD_SUCCESS;
7f342629 DS	415	}
	416
	417	DEFUN (no_ip_ospf_bfd,
	418	no_ip_ospf_bfd_cmd,
64dc4b2d RZ	419	#if HAVE_BFDD > 0
	420	"no ip ospf bfd",
	421	#else
692b4c65	422	"no ip ospf bfd [(2-255) (50-60000) (50-60000)]",
64dc4b2d	423	#endif /* HAVE_BFDD */
7f342629 DS	424	NO_STR
	425	"IP Information\n"
	426	"OSPF interface commands\n"
692b4c65	427	"Disables BFD support\n"
64dc4b2d	428	#if HAVE_BFDD == 0
692b4c65 QY	429	"Detect Multiplier\n"
692b4c65 QY	430	"Required min receive interval\n"
64dc4b2d RZ	431	"Desired min transmit interval\n"
	432	#endif /* !HAVE_BFDD */
	433	)
7f342629	434	{
d62a17ae	435	VTY_DECLVAR_CONTEXT(interface, ifp);
d62a17ae	436	struct ospf_if_params *params;
7f342629	437
d62a17ae	438	assert(ifp);
7f342629	439
d62a17ae	440	params = IF_DEF_PARAMS(ifp);
	441	if (params->bfd_info) {
	442	ospf_bfd_reg_dereg_all_nbr(ifp, ZEBRA_BFD_DEST_DEREGISTER);
	443	bfd_info_free(&(params->bfd_info));
	444	}
7f342629	445
d62a17ae	446	return CMD_SUCCESS;
7f342629 DS	447	}
7f342629 DS	448
d62a17ae	449	void ospf_bfd_init(void)
7f342629	450	{
d62a17ae	451	bfd_gbl_init();
567b877d	452
d62a17ae	453	/* Initialize BFD client functions */
	454	zclient->interface_bfd_dest_update = ospf_bfd_interface_dest_update;
	455	zclient->bfd_dest_replay = ospf_bfd_nbr_replay;
7f342629	456
d62a17ae	457	/* Install BFD command */
	458	install_element(INTERFACE_NODE, &ip_ospf_bfd_cmd);
	459	install_element(INTERFACE_NODE, &ip_ospf_bfd_param_cmd);
	460	install_element(INTERFACE_NODE, &no_ip_ospf_bfd_cmd);
7f342629	461	}