// 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 /* Macro for BGP read, write and timer thread. */ #define BGP_TIMER_ON(T, F, V) \ do { \ if ((peer->status != Deleted)) \ event_add_timer(bm->master, (F), peer, (V), &(T)); \ } while (0) #define BGP_EVENT_ADD(P, E) \ do { \ if ((P)->status != Deleted) \ event_add_event(bm->master, bgp_event, (P), (E), \ NULL); \ } while (0) #define BGP_EVENT_FLUSH(P) \ do { \ assert(peer); \ thread_cancel_event_ready(bm->master, (P)); \ } 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), peer, \ (BGP_DEFAULT_UPDATE_ADVERTISEMENT_TIME * \ 1000), \ (T)); \ else \ event_add_timer_msec(bm->master, (F), peer, 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 *peer, bool has_valid_nexthops); extern void bgp_event(struct event *event); extern int bgp_event_update(struct peer *, enum bgp_fsm_events event); extern int bgp_stop(struct peer *peer); extern void bgp_timer_set(struct peer *); extern void bgp_routeadv_timer(struct event *event); extern void bgp_fsm_change_status(struct peer *peer, 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 */