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// SPDX-License-Identifier: GPL-2.0-or-later
/* BGP-4 Finite State Machine
* From RFC1771 [A Border Gateway Protocol 4 (BGP-4)]
* Copyright (C) 1998 Kunihiro Ishiguro
*/
#ifndef _QUAGGA_BGP_FSM_H
#define _QUAGGA_BGP_FSM_H
enum bgp_fsm_state_progress {
BGP_FSM_FAILURE_AND_DELETE = -2,
BGP_FSM_FAILURE = -1,
BGP_FSM_SUCCESS = 0,
BGP_FSM_SUCCESS_STATE_TRANSFER = 1,
};
/* Macro for BGP read, write and timer thread. */
#define BGP_TIMER_ON(T, F, V) \
do { \
if ((connection->status != Deleted)) \
event_add_timer(bm->master, (F), connection, (V), \
&(T)); \
} while (0)
#define BGP_EVENT_ADD(C, E) \
do { \
if ((C)->status != Deleted) \
event_add_event(bm->master, bgp_event, (C), (E), NULL); \
} while (0)
#define BGP_UPDATE_GROUP_TIMER_ON(T, F) \
do { \
if (BGP_SUPPRESS_FIB_ENABLED(peer->bgp) && \
PEER_ROUTE_ADV_DELAY(peer)) \
event_add_timer_msec(bm->master, (F), connection, \
(BGP_DEFAULT_UPDATE_ADVERTISEMENT_TIME * \
1000), \
(T)); \
else \
event_add_timer_msec(bm->master, (F), connection, 0, \
(T)); \
} while (0)
#define BGP_MSEC_JITTER 10
/* Status codes for bgp_event_update() */
#define FSM_PEER_NOOP 0
#define FSM_PEER_STOPPED 1
#define FSM_PEER_TRANSFERRED 2
#define FSM_PEER_TRANSITIONED 3
#define BGP_PEER_GR_HELPER_ENABLE(peer) \
do { \
UNSET_FLAG( \
peer->peer_gr_new_status_flag, \
PEER_GRACEFUL_RESTART_NEW_STATE_RESTART); \
SET_FLAG( \
peer->peer_gr_new_status_flag, \
PEER_GRACEFUL_RESTART_NEW_STATE_HELPER);\
} while (0)
#define BGP_PEER_GR_ENABLE(peer)\
do { \
SET_FLAG( \
peer->peer_gr_new_status_flag, \
PEER_GRACEFUL_RESTART_NEW_STATE_RESTART); \
UNSET_FLAG( \
peer->peer_gr_new_status_flag, \
PEER_GRACEFUL_RESTART_NEW_STATE_HELPER);\
} while (0)
#define BGP_PEER_GR_DISABLE(peer)\
do { \
UNSET_FLAG( \
peer->peer_gr_new_status_flag, \
PEER_GRACEFUL_RESTART_NEW_STATE_RESTART);\
UNSET_FLAG(\
peer->peer_gr_new_status_flag, \
PEER_GRACEFUL_RESTART_NEW_STATE_HELPER);\
} while (0)
#define BGP_PEER_GR_GLOBAL_INHERIT_SET(peer) \
SET_FLAG(peer->peer_gr_new_status_flag, \
PEER_GRACEFUL_RESTART_NEW_STATE_INHERIT)
#define BGP_PEER_GR_GLOBAL_INHERIT_UNSET(peer) \
UNSET_FLAG(peer->peer_gr_new_status_flag, \
PEER_GRACEFUL_RESTART_NEW_STATE_INHERIT)
#define BGP_PEER_GRACEFUL_RESTART_CAPABLE(peer) \
(CHECK_FLAG(peer->cap, PEER_CAP_RESTART_ADV) \
&& CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV))
#define BGP_PEER_RESTARTING_MODE(peer) \
(CHECK_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART) && \
CHECK_FLAG(peer->cap, PEER_CAP_GRACEFUL_RESTART_R_BIT_ADV) && \
!CHECK_FLAG(peer->cap, PEER_CAP_GRACEFUL_RESTART_R_BIT_RCV))
#define BGP_PEER_HELPER_MODE(peer) \
(CHECK_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART_HELPER) && \
CHECK_FLAG(peer->cap, PEER_CAP_GRACEFUL_RESTART_R_BIT_RCV) && \
!CHECK_FLAG(peer->cap, PEER_CAP_GRACEFUL_RESTART_R_BIT_ADV))
/* Prototypes. */
/*
* Update FSM for peer based on whether we have valid nexthops or not.
*/
extern void bgp_fsm_nht_update(struct peer_connection *connection,
struct peer *peer, bool has_valid_nexthops);
extern void bgp_event(struct event *event);
extern int bgp_event_update(struct peer_connection *connection,
enum bgp_fsm_events event);
extern enum bgp_fsm_state_progress bgp_stop(struct peer_connection *connection);
extern void bgp_timer_set(struct peer_connection *connection);
extern void bgp_routeadv_timer(struct event *event);
extern void bgp_fsm_change_status(struct peer_connection *connection,
enum bgp_fsm_status status);
extern const char *const peer_down_str[];
extern void bgp_update_delay_end(struct bgp *);
extern void bgp_maxmed_update(struct bgp *);
extern bool bgp_maxmed_onstartup_configured(struct bgp *);
extern bool bgp_maxmed_onstartup_active(struct bgp *);
extern int bgp_fsm_error_subcode(int status);
/**
* Start the route advertisement timer (that honors MRAI) for all the
* peers. Typically called at the end of initial convergence, coming
* out of read-only mode.
*/
extern void bgp_start_routeadv(struct bgp *);
/**
* See if the route advertisement timer needs to be adjusted for a
* peer. For example, if the last update was written to the peer a
* long while back, we don't need to wait for the periodic advertisement
* timer to expire to send the new set of prefixes. It should fire
* instantly and updates should go out sooner.
*/
extern void bgp_adjust_routeadv(struct peer *);
#include "hook.h"
DECLARE_HOOK(peer_backward_transition, (struct peer *peer), (peer));
DECLARE_HOOK(peer_established, (struct peer *peer), (peer));
int bgp_gr_update_all(struct bgp *bgp, int global_gr_cmd);
int bgp_neighbor_graceful_restart(struct peer *peer, int peer_gr_cmd);
unsigned int bgp_peer_gr_action(struct peer *peer,
int old_peer_state, int new_peer_state);
void bgp_peer_move_to_gr_mode(struct peer *peer, int new_state);
unsigned int bgp_peer_gr_helper_enable(struct peer *peer);
unsigned int bgp_peer_gr_enable(struct peer *peer);
unsigned int bgp_peer_gr_global_inherit(struct peer *peer);
unsigned int bgp_peer_gr_disable(struct peer *peer);
enum peer_mode bgp_peer_gr_mode_get(struct peer *peer);
enum global_mode bgp_global_gr_mode_get(struct bgp *bgp);
enum peer_mode bgp_get_peer_gr_mode_from_flags(struct peer *peer);
unsigned int bgp_peer_gr_global_inherit_unset(struct peer *peer);
int bgp_gr_lookup_n_update_all_peer(struct bgp *bgp,
enum global_mode global_new_state,
enum global_mode global_old_state);
void bgp_peer_gr_flags_update(struct peer *peer);
const char *print_peer_gr_mode(enum peer_mode pr_mode);
const char *print_peer_gr_cmd(enum peer_gr_command pr_gr_cmd);
const char *print_global_gr_mode(enum global_mode gl_mode);
const char *print_global_gr_cmd(enum global_gr_command gl_gr_cmd);
int bgp_peer_reg_with_nht(struct peer *peer);
#endif /* _QUAGGA_BGP_FSM_H */
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