/* Execute ISM event process. */ int ospf_ism_event (struct thread *thread) { int event; int next_state; struct ospf_interface *oi; oi = THREAD_ARG (thread); event = THREAD_VAL (thread); /* Call function. */ next_state = (*(ISM [oi->state][event].func))(oi); if (! next_state) next_state = ISM [oi->state][event].next_state; if (IS_DEBUG_OSPF (ism, ISM_EVENTS)) zlog (NULL, LOG_DEBUG, "ISM[%s]: %s (%s)", IF_NAME (oi), LOOKUP (ospf_ism_state_msg, oi->state), ospf_ism_event_str[event]); /* If state is changed. */ if (next_state != oi->state) ism_change_state (oi, next_state); /* Make sure timer is set. */ ism_timer_set (oi); return 0; }
/* Execute NSM event process. */ int ospf_nsm_event (struct thread *thread) { int event; int next_state; struct ospf_neighbor *nbr; struct in_addr router_id; int old_state; struct ospf_interface *oi; nbr = THREAD_ARG (thread); event = THREAD_VAL (thread); router_id = nbr->router_id; old_state = nbr->state; oi = nbr->oi ; /* Call function. */ next_state = (*(NSM [nbr->state][event].func))(nbr); /* When event is NSM_KillNbr or InactivityTimer, the neighbor is deleted. */ if (event == NSM_KillNbr || event == NSM_InactivityTimer) { if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) zlog_debug ("NSM[%s:%s]: neighbor deleted", IF_NAME (oi), inet_ntoa (router_id)); /* Timers are canceled in ospf_nbr_free, moreover we cannot call nsm_timer_set here because nbr is freed already!!!*/ /*nsm_timer_set (nbr);*/ return 0; } if (! next_state) next_state = NSM [nbr->state][event].next_state; if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) zlog_debug ("NSM[%s:%s]: %s (%s)", IF_NAME (oi), inet_ntoa (nbr->router_id), LOOKUP (ospf_nsm_state_msg, nbr->state), ospf_nsm_event_str [event]); /* If state is changed. */ if (next_state != nbr->state) nsm_change_state (nbr, next_state); /* Make sure timer is set. */ nsm_timer_set (nbr); return 0; }
/* BGP connect retry timer. */ static int bgp_connect_timer (struct thread *thread) { struct peer *peer; peer = THREAD_ARG (thread); peer->t_connect = NULL; if (BGP_DEBUG (fsm, FSM)) zlog (peer->log, LOG_DEBUG, "%s [FSM] Timer (connect timer expire)", peer->host); THREAD_VAL (thread) = ConnectRetry_timer_expired; bgp_event (thread); /* bgp_event unlocks peer */ return 0; }
/* BGP start timer. This function set BGP_Start event to thread value and process event. */ static int bgp_start_timer (struct thread *thread) { struct peer *peer; peer = THREAD_ARG (thread); peer->t_start = NULL; if (BGP_DEBUG (fsm, FSM)) zlog (peer->log, LOG_DEBUG, "%s [FSM] Timer (start timer expire).", peer->host); THREAD_VAL (thread) = BGP_Start; bgp_event (thread); /* bgp_event unlocks peer */ return 0; }
/* BGP keepalive fire ! */ static int bgp_keepalive_timer (struct thread *thread) { struct peer *peer; peer = THREAD_ARG (thread); peer->t_keepalive = NULL; if (BGP_DEBUG (fsm, FSM)) zlog (peer->log, LOG_DEBUG, "%s [FSM] Timer (keepalive timer expire)", peer->host); THREAD_VAL (thread) = KeepAlive_timer_expired; bgp_event (thread); /* bgp_event unlocks peer */ return 0; }
/* BGP holdtime timer. */ static int bgp_holdtime_timer (struct thread *thread) { struct peer *peer; peer = THREAD_ARG (thread); peer->t_holdtime = NULL; if (BGP_DEBUG (fsm, FSM)) zlog (peer->log, LOG_DEBUG, "%s [FSM] Timer (holdtime timer expire)", peer->host); THREAD_VAL (thread) = Hold_Timer_expired; bgp_event (thread); return 0; }
/* Execute event process. */ int bgp_event (struct thread *thread) { int ret = 0; int event; int next; struct peer *peer; peer = THREAD_ARG (thread); event = THREAD_VAL (thread); /* Logging this event. */ next = FSM [peer->status -1][event - 1].next_state; if (BGP_DEBUG (fsm, FSM) && peer->status != next) plog_debug (peer->log, "%s [FSM] %s (%s->%s)", peer->host, bgp_event_str[event], LOOKUP (bgp_status_msg, peer->status), LOOKUP (bgp_status_msg, next)); /* Call function. */ if (FSM [peer->status -1][event - 1].func) ret = (*(FSM [peer->status - 1][event - 1].func))(peer); /* When function do not want proceed next job return -1. */ if (ret >= 0) { /* If status is changed. */ if (next != peer->status) { /* Transition into Clearing must /always/ clear all routes.. */ if (next == Clearing) bgp_clear_route_all (peer); bgp_fsm_change_status (peer, next); } /* Make sure timer is set. */ bgp_timer_set (peer); } return ret; }
/* BGP start timer. This function set BGP_Start event to thread value and process event. */ static int bgp_start_timer (struct thread *thread) { struct peer *peer; peer = THREAD_ARG (thread); peer->t_start = NULL; UNSET_FLAG (peer->sflags, PEER_STATUS_CREATE_INIT); if (BGP_DEBUG (fsm, FSM)) zlog (peer->log, LOG_DEBUG, "%s [FSM] Timer (start timer expire).", peer->host); THREAD_VAL (thread) = BGP_Start; bgp_event (thread); return 0; }
/* Execute event process. */ int bgp_event (struct thread *thread) { int ret; int event; int next; struct peer *peer; peer = THREAD_ARG (thread); event = THREAD_VAL (thread); /* Logging this event. */ next = FSM [peer->status -1][event - 1].next_state; if (BGP_DEBUG (fsm, FSM)) plog_info (peer->log, "%s [FSM] %s (%s->%s)", peer->host, bgp_event_str[event], LOOKUP (bgp_status_msg, peer->status), LOOKUP (bgp_status_msg, next)); if (BGP_DEBUG (normal, NORMAL) && strcmp (LOOKUP (bgp_status_msg, peer->status), LOOKUP (bgp_status_msg, next))) zlog_info ("%s went from %s to %s", peer->host, LOOKUP (bgp_status_msg, peer->status), LOOKUP (bgp_status_msg, next)); /* Call function. */ ret = (*(FSM [peer->status - 1][event - 1].func))(peer); /* When function do not want proceed next job return -1. */ if (ret < 0) return ret; /* If status is changed. */ if (next != peer->status) bgp_fsm_change_status (peer, next); /* Make sure timer is set. */ bgp_timer_set (peer); return 0; }
/* Execute NSM event process. */ int ospf_nsm_event (struct thread *thread) { int event; int next_state; struct ospf_neighbor *nbr; nbr = THREAD_ARG (thread); event = THREAD_VAL (thread); if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) zlog_debug ("NSM[%s:%s]: %s (%s)", IF_NAME (nbr->oi), inet_ntoa (nbr->router_id), LOOKUP (ospf_nsm_state_msg, nbr->state), ospf_nsm_event_str [event]); next_state = NSM [nbr->state][event].next_state; /* Call function. */ if (NSM [nbr->state][event].func != NULL) { int func_state = (*(NSM [nbr->state][event].func))(nbr); if (NSM [nbr->state][event].next_state == NSM_DependUpon) next_state = func_state; else if (func_state) { /* There's a mismatch between the FSM tables and what an FSM * action/state-change function returned. State changes which * do not have conditional/DependUpon next-states should not * try set next_state. */ zlog_warn ("NSM[%s:%s]: %s (%s): " "Warning: action tried to change next_state to %s", IF_NAME (nbr->oi), inet_ntoa (nbr->router_id), LOOKUP (ospf_nsm_state_msg, nbr->state), ospf_nsm_event_str [event], LOOKUP (ospf_nsm_state_msg, func_state)); } } assert (next_state != NSM_DependUpon); /* If state is changed. */ if (next_state != nbr->state) { nsm_notice_state_change (nbr, next_state, event); nsm_change_state (nbr, next_state); } /* Make sure timer is set. */ nsm_timer_set (nbr); /* When event is NSM_KillNbr, InactivityTimer or LLDown, the neighbor * is deleted. * * Rather than encode knowledge here of which events lead to NBR * delete, we take our cue from the NSM table, via the dummy * 'Deleted' neighbour state. */ if (nbr->state == NSM_Deleted) ospf_nbr_delete (nbr); return 0; }