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frr/bfdd/bfd.h

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// SPDX-License-Identifier: GPL-2.0-or-later
/*********************************************************************
* Copyright 2014,2015,2016,2017 Cumulus Networks, Inc. All rights reserved.
*
* bfd.h: implements the BFD protocol.
*/
#ifndef _BFD_H_
#define _BFD_H_
#include <netinet/in.h>
#include <stdbool.h>
#include <stdarg.h>
#include <stdint.h>
#include "lib/hash.h"
#include "lib/libfrr.h"
#include "lib/qobj.h"
#include "lib/queue.h"
#include "lib/vrf.h"
#include "bfdctl.h"
#ifdef BFD_DEBUG
#define BFDD_JSON_CONV_OPTIONS (JSON_C_TO_STRING_PRETTY)
#else
#define BFDD_JSON_CONV_OPTIONS (0)
#endif
DECLARE_MGROUP(BFDD);
DECLARE_MTYPE(BFDD_CONTROL);
DECLARE_MTYPE(BFDD_NOTIFICATION);
struct bfd_timers {
uint32_t desired_min_tx;
uint32_t required_min_rx;
uint32_t required_min_echo;
};
struct bfd_discrs {
uint32_t my_discr;
uint32_t remote_discr;
};
/*
* Format of control packet. From section 4)
*/
struct bfd_pkt {
union {
uint32_t byteFields;
struct {
uint8_t diag;
uint8_t flags;
uint8_t detect_mult;
uint8_t len;
};
};
struct bfd_discrs discrs;
struct bfd_timers timers;
};
/*
* Format of Echo packet.
*/
struct bfd_echo_pkt {
union {
uint32_t byteFields;
struct {
uint8_t ver;
uint8_t len;
uint16_t reserved;
};
};
uint32_t my_discr;
uint64_t time_sent_sec;
uint64_t time_sent_usec;
};
/* Macros for manipulating control packets */
#define BFD_VERMASK 0x03
#define BFD_DIAGMASK 0x1F
#define BFD_GETVER(diag) ((diag >> 5) & BFD_VERMASK)
#define BFD_SETVER(diag, val) ((diag) |= (val & BFD_VERMASK) << 5)
#define BFD_VERSION 1
#define BFD_PBIT 0x20
#define BFD_FBIT 0x10
#define BFD_CBIT 0x08
#define BFD_ABIT 0x04
#define BFD_DEMANDBIT 0x02
#define BFD_SETDEMANDBIT(flags, val) \
{ \
if ((val)) \
flags |= BFD_DEMANDBIT; \
}
#define BFD_SETPBIT(flags, val) \
{ \
if ((val)) \
flags |= BFD_PBIT; \
}
#define BFD_GETPBIT(flags) (flags & BFD_PBIT)
#define BFD_SETFBIT(flags, val) \
{ \
if ((val)) \
flags |= BFD_FBIT; \
}
#define BFD_GETFBIT(flags) (flags & BFD_FBIT)
#define BFD_SETSTATE(flags, val) \
{ \
if ((val)) \
flags |= (val & 0x3) << 6; \
}
#define BFD_GETSTATE(flags) ((flags >> 6) & 0x3)
#define BFD_SETCBIT(flags, val) \
{ \
if ((val)) \
flags |= val; \
}
#define BFD_GETCBIT(flags) (flags & BFD_FBIT)
#define BFD_ECHO_VERSION 1
#define BFD_ECHO_PKT_LEN sizeof(struct bfd_echo_pkt)
enum bfd_diagnosticis {
BD_OK = 0,
/* Control Detection Time Expired. */
BD_CONTROL_EXPIRED = 1,
/* Echo Function Failed. */
BD_ECHO_FAILED = 2,
/* Neighbor Signaled Session Down. */
BD_NEIGHBOR_DOWN = 3,
/* Forwarding Plane Reset. */
BD_FORWARDING_RESET = 4,
/* Path Down. */
BD_PATH_DOWN = 5,
/* Concatenated Path Down. */
BD_CONCATPATH_DOWN = 6,
/* Administratively Down. */
BD_ADMIN_DOWN = 7,
/* Reverse Concatenated Path Down. */
BD_REVCONCATPATH_DOWN = 8,
/* 9..31: reserved. */
};
/* BFD session flags */
enum bfd_session_flags {
BFD_SESS_FLAG_NONE = 0,
BFD_SESS_FLAG_ECHO = 1 << 0, /* BFD Echo functionality */
BFD_SESS_FLAG_ECHO_ACTIVE = 1 << 1, /* BFD Echo Packets are being sent
* actively
*/
BFD_SESS_FLAG_MH = 1 << 2, /* BFD Multi-hop session */
BFD_SESS_FLAG_IPV6 = 1 << 4, /* BFD IPv6 session */
BFD_SESS_FLAG_SEND_EVT_ACTIVE = 1 << 5, /* send event timer active */
BFD_SESS_FLAG_SEND_EVT_IGNORE = 1 << 6, /* ignore send event when timer
* expires
*/
BFD_SESS_FLAG_SHUTDOWN = 1 << 7, /* disable BGP peer function */
BFD_SESS_FLAG_CONFIG = 1 << 8, /* Session configured with bfd NB API */
BFD_SESS_FLAG_CBIT = 1 << 9, /* CBIT is set */
BFD_SESS_FLAG_PASSIVE = 1 << 10, /* Passive mode */
BFD_SESS_FLAG_MAC_SET = 1 << 11, /* MAC of peer known */
};
/*
* BFD session hash key.
*
* This structure must not have any padding bytes because their value is
* unspecified after the struct assignment. Even when all fields of two keys
* are the same, if the padding bytes are different, then the calculated hash
* value is different, and the hash lookup will fail.
*
* Currently, the structure fields are correctly aligned, and the "packed"
* attribute is added as a precaution. "family" and "mhop" fields are two-bytes
* to eliminate unaligned memory access to "peer" and "local".
*/
struct bfd_key {
uint16_t family;
uint16_t mhop;
struct in6_addr peer;
struct in6_addr local;
char ifname[INTERFACE_NAMSIZ];
char vrfname[VRF_NAMSIZ];
} __attribute__((packed));
struct bfd_session_stats {
uint64_t rx_ctrl_pkt;
uint64_t tx_ctrl_pkt;
uint64_t rx_echo_pkt;
uint64_t tx_echo_pkt;
uint64_t session_up;
uint64_t session_down;
uint64_t znotification;
};
/**
* BFD session profile to override default configurations.
*/
struct bfd_profile {
/** Profile name. */
char name[64];
/** Session detection multiplier. */
uint8_t detection_multiplier;
/** Desired transmission interval (in microseconds). */
uint32_t min_tx;
/** Minimum required receive interval (in microseconds). */
uint32_t min_rx;
/** Administrative state. */
bool admin_shutdown;
/** Passive mode. */
bool passive;
/** Minimum expected TTL value. */
uint8_t minimum_ttl;
/** Echo mode (only applies to single hop). */
bool echo_mode;
/** Desired echo transmission interval (in microseconds). */
uint32_t min_echo_tx;
/** Minimum required echo receive interval (in microseconds). */
uint32_t min_echo_rx;
/** Profile list entry. */
TAILQ_ENTRY(bfd_profile) entry;
};
/** Profile list type. */
TAILQ_HEAD(bfdproflist, bfd_profile);
/* bfd_session shortcut label forwarding. */
struct peer_label;
struct bfd_config_timers {
uint32_t desired_min_tx;
uint32_t required_min_rx;
uint32_t desired_min_echo_tx;
uint32_t required_min_echo_rx;
};
#define BFD_RTT_SAMPLE 8
/*
* Session state information
*/
struct bfd_session {
/* protocol state per RFC 5880*/
uint8_t ses_state;
struct bfd_discrs discrs;
uint8_t local_diag;
uint8_t demand_mode;
uint8_t detect_mult;
uint8_t remote_detect_mult;
uint8_t mh_ttl;
uint8_t remote_cbit;
/** BFD profile name. */
char *profile_name;
/** BFD pre configured profile. */
struct bfd_profile *profile;
/** BFD peer configuration (without profile). */
struct bfd_profile peer_profile;
/* Timers */
struct bfd_config_timers timers;
struct bfd_timers cur_timers;
uint64_t detect_TO;
struct thread *echo_recvtimer_ev;
struct thread *recvtimer_ev;
uint64_t xmt_TO;
uint64_t echo_xmt_TO;
struct thread *xmttimer_ev;
struct thread *echo_xmttimer_ev;
uint64_t echo_detect_TO;
/* software object state */
uint8_t polling;
/* This and the localDiscr are the keys to state info */
struct bfd_key key;
struct peer_label *pl;
struct bfd_dplane_ctx *bdc;
struct sockaddr_any local_address;
uint8_t peer_hw_addr[ETH_ALEN];
struct interface *ifp;
struct vrf *vrf;
int sock;
/* BFD session flags */
enum bfd_session_flags flags;
struct bfd_session_stats stats;
struct timeval uptime; /* last up time */
struct timeval downtime; /* last down time */
/* Remote peer data (for debugging mostly) */
uint8_t remote_diag;
struct bfd_timers remote_timers;
uint64_t refcount; /* number of pointers referencing this. */
uint8_t rtt_valid; /* number of valid samples */
uint8_t rtt_index; /* last index added */
uint64_t rtt[BFD_RTT_SAMPLE]; /* RRT in usec for echo to be looped */
};
struct peer_label {
TAILQ_ENTRY(peer_label) pl_entry;
struct bfd_session *pl_bs;
char pl_label[MAXNAMELEN];
};
TAILQ_HEAD(pllist, peer_label);
struct bfd_diag_str_list {
const char *str;
int type;
};
struct bfd_state_str_list {
const char *str;
int type;
};
struct bfd_session_observer {
struct bfd_session *bso_bs;
char bso_entryname[MAXNAMELEN];
struct prefix bso_addr;
TAILQ_ENTRY(bfd_session_observer) bso_entry;
};
TAILQ_HEAD(obslist, bfd_session_observer);
/* States defined per 4.1 */
#define PTM_BFD_ADM_DOWN 0
#define PTM_BFD_DOWN 1
#define PTM_BFD_INIT 2
#define PTM_BFD_UP 3
/* Various constants */
/* Retrieved from ptm_timer.h from Cumulus PTM sources. */
#define BFD_DEF_DEMAND 0
#define BFD_DEFDETECTMULT 3
#define BFD_DEFDESIREDMINTX (300 * 1000) /* microseconds. */
#define BFD_DEFREQUIREDMINRX (300 * 1000) /* microseconds. */
#define BFD_DEF_DES_MIN_ECHO_TX (50 * 1000) /* microseconds. */
#define BFD_DEF_REQ_MIN_ECHO_RX (50 * 1000) /* microseconds. */
#define BFD_DEF_SLOWTX (1000 * 1000) /* microseconds. */
/** Minimum multi hop TTL. */
#define BFD_DEF_MHOP_TTL 254
#define BFD_PKT_LEN 24 /* Length of control packet */
#define BFD_TTL_VAL 255
#define BFD_RCV_TTL_VAL 1
#define BFD_TOS_VAL 0xC0
#define BFD_PKT_INFO_VAL 1
#define BFD_IPV6_PKT_INFO_VAL 1
#define BFD_IPV6_ONLY_VAL 1
#define BFD_SRCPORTINIT 49152
#define BFD_SRCPORTMAX 65535
#define BFD_DEFDESTPORT 3784
#define BFD_DEF_ECHO_PORT 3785
#define BFD_DEF_MHOP_DEST_PORT 4784
/*
* control.c
*
* Daemon control code to speak with local consumers.
*/
/* See 'bfdctrl.h' for client protocol definitions. */
struct bfd_control_buffer {
size_t bcb_left;
size_t bcb_pos;
union {
struct bfd_control_msg *bcb_bcm;
uint8_t *bcb_buf;
};
};
struct bfd_control_queue {
TAILQ_ENTRY(bfd_control_queue) bcq_entry;
struct bfd_control_buffer bcq_bcb;
};
TAILQ_HEAD(bcqueue, bfd_control_queue);
struct bfd_notify_peer {
TAILQ_ENTRY(bfd_notify_peer) bnp_entry;
struct bfd_session *bnp_bs;
};
TAILQ_HEAD(bnplist, bfd_notify_peer);
struct bfd_control_socket {
TAILQ_ENTRY(bfd_control_socket) bcs_entry;
int bcs_sd;
struct thread *bcs_ev;
struct thread *bcs_outev;
struct bcqueue bcs_bcqueue;
/* Notification data */
uint64_t bcs_notify;
struct bnplist bcs_bnplist;
enum bc_msg_version bcs_version;
enum bc_msg_type bcs_type;
/* Message buffering */
struct bfd_control_buffer bcs_bin;
struct bfd_control_buffer *bcs_bout;
};
TAILQ_HEAD(bcslist, bfd_control_socket);
int control_init(const char *path);
void control_shutdown(void);
int control_notify(struct bfd_session *bs, uint8_t notify_state);
int control_notify_config(const char *op, struct bfd_session *bs);
void control_accept(struct thread *t);
/*
* bfdd.c
*
* Daemon specific code.
*/
struct bfd_vrf_global {
int bg_shop;
int bg_mhop;
int bg_shop6;
int bg_mhop6;
int bg_echo;
int bg_echov6;
struct vrf *vrf;
struct thread *bg_ev[6];
};
/* Forward declaration of data plane context struct. */
struct bfd_dplane_ctx;
TAILQ_HEAD(dplane_queue, bfd_dplane_ctx);
struct bfd_global {
int bg_csock;
struct thread *bg_csockev;
struct bcslist bg_bcslist;
struct pllist bg_pllist;
struct obslist bg_obslist;
struct zebra_privs_t bfdd_privs;
/**
* Daemon is exit()ing? Use this to avoid actions that expect a
* running system or to avoid unnecessary operations when quitting.
*/
bool bg_shutdown;
/* Distributed BFD items. */
bool bg_use_dplane;
int bg_dplane_sock;
struct thread *bg_dplane_sockev;
struct dplane_queue bg_dplaneq;
/* Debug options. */
/* Show distributed BFD debug messages. */
bool debug_dplane;
/* Show all peer state changes events. */
bool debug_peer_event;
/*
* Show zebra message exchanges:
* - Interface add/delete.
* - Local address add/delete.
* - VRF add/delete.
*/
bool debug_zebra;
/*
* Show network level debug information:
* - Echo packets without session.
* - Unavailable peer sessions.
* - Network system call failures.
*/
bool debug_network;
};
extern struct bfd_global bglobal;
extern const struct bfd_diag_str_list diag_list[];
extern const struct bfd_state_str_list state_list[];
void socket_close(int *s);
/*
* config.c
*
* Contains the code related with loading/reloading configuration.
*/
int parse_config(const char *fname);
int config_request_add(const char *jsonstr);
int config_request_del(const char *jsonstr);
char *config_response(const char *status, const char *error);
char *config_notify(struct bfd_session *bs);
char *config_notify_config(const char *op, struct bfd_session *bs);
typedef int (*bpc_handle)(struct bfd_peer_cfg *, void *arg);
int config_notify_request(struct bfd_control_socket *bcs, const char *jsonstr,
bpc_handle bh);
struct peer_label *pl_new(const char *label, struct bfd_session *bs);
struct peer_label *pl_find(const char *label);
void pl_free(struct peer_label *pl);
/*
* logging - alias to zebra log
*/
#define zlog_fatal(msg, ...) \
do { \
zlog_err(msg, ##__VA_ARGS__); \
assert(!msg); \
abort(); \
} while (0)
/*
* bfd_packet.c
*
* Contains the code related with receiving/seding, packing/unpacking BFD data.
*/
int bp_set_ttlv6(int sd, uint8_t value);
int bp_set_ttl(int sd, uint8_t value);
int bp_set_tosv6(int sd, uint8_t value);
int bp_set_tos(int sd, uint8_t value);
int bp_bind_dev(int sd, const char *dev);
int bp_udp_shop(const struct vrf *vrf);
int bp_udp_mhop(const struct vrf *vrf);
int bp_udp6_shop(const struct vrf *vrf);
int bp_udp6_mhop(const struct vrf *vrf);
int bp_peer_socket(const struct bfd_session *bs);
int bp_peer_socketv6(const struct bfd_session *bs);
int bp_echo_socket(const struct vrf *vrf);
int bp_echov6_socket(const struct vrf *vrf);
void ptm_bfd_snd(struct bfd_session *bfd, int fbit);
void ptm_bfd_echo_snd(struct bfd_session *bfd);
void ptm_bfd_echo_fp_snd(struct bfd_session *bfd);
void bfd_recv_cb(struct thread *t);
/*
* event.c
*
* Contains the code related with event loop.
*/
typedef void (*bfd_ev_cb)(struct thread *t);
void bfd_recvtimer_update(struct bfd_session *bs);
void bfd_echo_recvtimer_update(struct bfd_session *bs);
void bfd_xmttimer_update(struct bfd_session *bs, uint64_t jitter);
void bfd_echo_xmttimer_update(struct bfd_session *bs, uint64_t jitter);
void bfd_xmttimer_delete(struct bfd_session *bs);
void bfd_echo_xmttimer_delete(struct bfd_session *bs);
void bfd_recvtimer_delete(struct bfd_session *bs);
void bfd_echo_recvtimer_delete(struct bfd_session *bs);
void bfd_recvtimer_assign(struct bfd_session *bs, bfd_ev_cb cb, int sd);
void bfd_echo_recvtimer_assign(struct bfd_session *bs, bfd_ev_cb cb, int sd);
void bfd_xmttimer_assign(struct bfd_session *bs, bfd_ev_cb cb);
void bfd_echo_xmttimer_assign(struct bfd_session *bs, bfd_ev_cb cb);
/*
* bfd.c
*
* BFD protocol specific code.
*/
int bfd_session_enable(struct bfd_session *bs);
void bfd_session_disable(struct bfd_session *bs);
struct bfd_session *ptm_bfd_sess_new(struct bfd_peer_cfg *bpc);
int ptm_bfd_sess_del(struct bfd_peer_cfg *bpc);
void ptm_bfd_sess_dn(struct bfd_session *bfd, uint8_t diag);
void ptm_bfd_sess_up(struct bfd_session *bfd);
void ptm_bfd_echo_stop(struct bfd_session *bfd);
void ptm_bfd_echo_start(struct bfd_session *bfd);
void ptm_bfd_xmt_TO(struct bfd_session *bfd, int fbit);
void ptm_bfd_start_xmt_timer(struct bfd_session *bfd, bool is_echo);
struct bfd_session *ptm_bfd_sess_find(struct bfd_pkt *cp,
struct sockaddr_any *peer,
struct sockaddr_any *local,
struct interface *ifp,
vrf_id_t vrfid,
bool is_mhop);
struct bfd_session *bs_peer_find(struct bfd_peer_cfg *bpc);
int bfd_session_update_label(struct bfd_session *bs, const char *nlabel);
void bfd_set_polling(struct bfd_session *bs);
void bs_state_handler(struct bfd_session *bs, int nstate);
void bs_echo_timer_handler(struct bfd_session *bs);
void bs_final_handler(struct bfd_session *bs);
void bs_set_slow_timers(struct bfd_session *bs);
const char *satostr(const struct sockaddr_any *sa);
const char *diag2str(uint8_t diag);
int strtosa(const char *addr, struct sockaddr_any *sa);
void integer2timestr(uint64_t time, char *buf, size_t buflen);
const char *bs_to_string(const struct bfd_session *bs);
int bs_observer_add(struct bfd_session *bs);
void bs_observer_del(struct bfd_session_observer *bso);
void bs_to_bpc(struct bfd_session *bs, struct bfd_peer_cfg *bpc);
void gen_bfd_key(struct bfd_key *key, struct sockaddr_any *peer,
struct sockaddr_any *local, bool mhop, const char *ifname,
const char *vrfname);
struct bfd_session *bfd_session_new(void);
struct bfd_session *bs_registrate(struct bfd_session *bs);
void bfd_session_free(struct bfd_session *bs);
const struct bfd_session *bfd_session_next(const struct bfd_session *bs,
bool mhop);
void bfd_sessions_remove_manual(void);
void bfd_profiles_remove(void);
void bfd_rtt_init(struct bfd_session *bfd);
/**
* Set the BFD session echo state.
*
* \param bs the BFD session.
* \param echo the echo operational state.
*/
void bfd_set_echo(struct bfd_session *bs, bool echo);
/**
* Set the BFD session functional state.
*
* \param bs the BFD session.
* \param shutdown the operational value.
*/
void bfd_set_shutdown(struct bfd_session *bs, bool shutdown);
/**
* Set the BFD session passive mode.
*
* \param bs the BFD session.
* \param passive the passive mode.
*/
void bfd_set_passive_mode(struct bfd_session *bs, bool passive);
/**
* Picks the BFD session configuration from the appropriated source:
* if using the default peer configuration prefer profile (if it exists),
* otherwise use session.
*
* \param bs the BFD session.
*/
void bfd_session_apply(struct bfd_session *bs);
/* BFD hash data structures interface */
void bfd_initialize(void);
void bfd_shutdown(void);
void bfd_vrf_init(void);
void bfd_vrf_terminate(void);
struct bfd_vrf_global *bfd_vrf_look_by_session(struct bfd_session *bfd);
struct bfd_session *bfd_id_lookup(uint32_t id);
struct bfd_session *bfd_key_lookup(struct bfd_key key);
struct bfd_session *bfd_id_delete(uint32_t id);
struct bfd_session *bfd_key_delete(struct bfd_key key);
bool bfd_id_insert(struct bfd_session *bs);
bool bfd_key_insert(struct bfd_session *bs);
typedef void (*hash_iter_func)(struct hash_bucket *hb, void *arg);
void bfd_id_iterate(hash_iter_func hif, void *arg);
void bfd_key_iterate(hash_iter_func hif, void *arg);
unsigned long bfd_get_session_count(void);
/* Export callback functions for `event.c`. */
extern struct thread_master *master;
void bfd_recvtimer_cb(struct thread *t);
void bfd_echo_recvtimer_cb(struct thread *t);
void bfd_xmt_cb(struct thread *t);
void bfd_echo_xmt_cb(struct thread *t);
extern struct in6_addr zero_addr;
/**
* Creates a new profile entry and insert into the global list.
*
* \param name the BFD profile name.
*
* \returns `NULL` if it already exists otherwise the new entry.
*/
struct bfd_profile *bfd_profile_new(const char *name);
/**
* Search for configured BFD profiles (profile name is case insensitive).
*
* \param name the BFD profile name.
*
* \returns `NULL` if it doesn't exist otherwise the entry.
*/
struct bfd_profile *bfd_profile_lookup(const char *name);
/**
* Removes profile from list and free memory.
*
* \param bp the BFD profile.
*/
void bfd_profile_free(struct bfd_profile *bp);
/**
* Apply a profile configuration to an existing BFD session. The non default
* values will not be overridden.
*
* NOTE: if the profile doesn't exist yet, then the profile will be applied
* once it begins to exist.
*
* \param profile_name the BFD profile name.
* \param bs the BFD session.
*/
void bfd_profile_apply(const char *profname, struct bfd_session *bs);
/**
* Remove any applied profile from session and revert the session
* configuration.
*
* \param bs the BFD session.
*/
void bfd_profile_remove(struct bfd_session *bs);
/**
* Apply new profile values to sessions using it.
*
* \param[in] bp the BFD profile that got updated.
*/
void bfd_profile_update(struct bfd_profile *bp);
/*
* bfdd_vty.c
*
* BFD daemon vty shell commands.
*/
void bfdd_vty_init(void);
/*
* bfdd_cli.c
*
* BFD daemon CLI implementation.
*/
void bfdd_cli_init(void);
/*
* ptm_adapter.c
*/
void bfdd_zclient_init(struct zebra_privs_t *bfdd_priv);
void bfdd_zclient_stop(void);
void bfdd_zclient_unregister(vrf_id_t vrf_id);
void bfdd_zclient_register(vrf_id_t vrf_id);
void bfdd_sessions_enable_vrf(struct vrf *vrf);
void bfdd_sessions_disable_vrf(struct vrf *vrf);
int ptm_bfd_notify(struct bfd_session *bs, uint8_t notify_state);
/*
* dplane.c
*/
/**
* Initialize BFD data plane infrastructure for distributed BFD implementation.
*
* \param sa socket address.
* \param salen socket address structure length.
* \param client `true` means connecting socket, `false` listening socket.
*/
void bfd_dplane_init(const struct sockaddr *sa, socklen_t salen, bool client);
/**
* Attempts to delegate the BFD session liveness detection to hardware.
*
* \param bs the BFD session data structure.
*
* \returns
* `0` on success and BFD daemon should do nothing or `-1` on failure
* and we should fallback to software implementation.
*/
int bfd_dplane_add_session(struct bfd_session *bs);
/**
* Send new session settings to data plane.
*
* \param bs the BFD session to update.
*/
int bfd_dplane_update_session(const struct bfd_session *bs);
/**
* Deletes session from data plane.
*
* \param bs the BFD session to delete.
*
* \returns `0` on success otherwise `-1`.
*/
int bfd_dplane_delete_session(struct bfd_session *bs);
/**
* Asks the data plane for updated counters and update the session data
* structure.
*
* \param bs the BFD session that needs updating.
*
* \returns `0` on success otherwise `-1` on failure.
*/
int bfd_dplane_update_session_counters(struct bfd_session *bs);
void bfd_dplane_show_counters(struct vty *vty);
#endif /* _BFD_H_ */
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