/* 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;
}
int
nsm_kill_nbr (struct ospf_neighbor *nbr)
{
/* call it here because we cannot call it from ospf_nsm_event */
nsm_change_state (nbr, NSM_Down);
/* Reset neighbor. */
/* killing nbr_self is invalid */
assert (nbr != nbr->oi->nbr_self);
if (nbr == nbr->oi->nbr_self)
return 1;
nsm_reset_nbr (nbr);
if (nbr->oi->type == OSPF_IFTYPE_NBMA && nbr->nbr_nbma != NULL)
{
struct ospf_nbr_nbma *nbr_nbma = nbr->nbr_nbma;
nbr_nbma->nbr = NULL;
nbr_nbma->state_change = nbr->state_change;
nbr->nbr_nbma = NULL;
OSPF_POLL_TIMER_ON (nbr_nbma->t_poll, ospf_poll_timer,
nbr_nbma->v_poll);
if (IS_DEBUG_OSPF (nsm, NSM_EVENTS))
zlog_debug ("NSM[%s:%s]: Down (PollIntervalTimer scheduled)",
IF_NAME (nbr->oi), inet_ntoa (nbr->address.u.prefix4));
}
/* Delete neighbor from interface. */
ospf_nbr_delete (nbr);
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;
}
