int
ospf_hello_timer (struct thread *thread)
{
struct ospf_interface *oi;
oi = THREAD_ARG (thread);
oi->t_hello = NULL;
if (IS_DEBUG_OSPF (ism, ISM_TIMERS))
zlog (NULL, LOG_DEBUG, "ISM[%s]: Timer (Hello timer expire)",
IF_NAME (oi));
/* Sending hello packet. */
ospf_hello_send (oi);
/* Hello timer set. */
OSPF_ISM_TIMER_ON (oi->t_hello, ospf_hello_timer,
OSPF_IF_PARAM (oi, v_hello));
return 0;
}
void
nsm_change_state (struct ospf_neighbor *nbr, int state)
{
struct ospf_interface *oi = nbr->oi;
struct ospf_area *vl_area = NULL;
u_char old_state;
int x;
int force = 1;
/* Logging change of status. */
if (IS_DEBUG_OSPF (nsm, NSM_STATUS))
zlog_debug ("NSM[%s:%s]: State change %s -> %s",
IF_NAME (nbr->oi), inet_ntoa (nbr->router_id),
LOOKUP (ospf_nsm_state_msg, nbr->state),
LOOKUP (ospf_nsm_state_msg, state));
/* Preserve old status. */
old_state = nbr->state;
/* Change to new status. */
nbr->state = state;
/* Statistics. */
nbr->state_change++;
if (oi->type == OSPF_IFTYPE_VIRTUALLINK)
vl_area = ospf_area_lookup_by_area_id (oi->ospf, oi->vl_data->vl_area_id);
/* One of the neighboring routers changes to/from the FULL state. */
if ((old_state != NSM_Full && state == NSM_Full) ||
(old_state == NSM_Full && state != NSM_Full))
{
if (state == NSM_Full)
{
oi->full_nbrs++;
oi->area->full_nbrs++;
ospf_check_abr_status (oi->ospf);
if (oi->type == OSPF_IFTYPE_VIRTUALLINK && vl_area)
if (++vl_area->full_vls == 1)
ospf_schedule_abr_task (oi->ospf);
/* kevinm: refresh any redistributions */
for (x = ZEBRA_ROUTE_SYSTEM; x < ZEBRA_ROUTE_MAX; x++)
{
if (x == ZEBRA_ROUTE_OSPF || x == ZEBRA_ROUTE_OSPF6)
continue;
ospf_external_lsa_refresh_type (oi->ospf, x, force);
}
}
else
{
oi->full_nbrs--;
oi->area->full_nbrs--;
ospf_check_abr_status (oi->ospf);
if (oi->type == OSPF_IFTYPE_VIRTUALLINK && vl_area)
if (vl_area->full_vls > 0)
if (--vl_area->full_vls == 0)
ospf_schedule_abr_task (oi->ospf);
/* clear neighbor retransmit list */
if (!ospf_ls_retransmit_isempty (nbr))
ospf_ls_retransmit_clear (nbr);
}
zlog_info ("nsm_change_state(%s, %s -> %s): "
"scheduling new router-LSA origination",
inet_ntoa (nbr->router_id),
LOOKUP(ospf_nsm_state_msg, old_state),
LOOKUP(ospf_nsm_state_msg, state));
ospf_router_lsa_timer_add (oi->area);
if (oi->type == OSPF_IFTYPE_VIRTUALLINK)
{
struct ospf_area *vl_area =
ospf_area_lookup_by_area_id (oi->ospf, oi->vl_data->vl_area_id);
if (vl_area)
ospf_router_lsa_timer_add (vl_area);
}
/* Originate network-LSA. */
if (oi->state == ISM_DR)
{
if (oi->network_lsa_self && oi->full_nbrs == 0)
{
ospf_lsa_flush_area (oi->network_lsa_self, oi->area);
ospf_lsa_unlock (oi->network_lsa_self);
oi->network_lsa_self = NULL;
OSPF_TIMER_OFF (oi->t_network_lsa_self);
}
else
ospf_network_lsa_timer_add (oi);
}
}
#ifdef HAVE_OPAQUE_LSA
ospf_opaque_nsm_change (nbr, old_state);
#endif /* HAVE_OPAQUE_LSA */
/* Start DD exchange protocol */
if (state == NSM_ExStart)
{
if (nbr->dd_seqnum == 0)
nbr->dd_seqnum = time (NULL);
else
nbr->dd_seqnum++;
nbr->dd_flags = OSPF_DD_FLAG_I|OSPF_DD_FLAG_M|OSPF_DD_FLAG_MS;
ospf_db_desc_send (nbr);
}
/* clear cryptographic sequence number */
if (state == NSM_Down)
nbr->crypt_seqnum = 0;
/* Generete NeighborChange ISM event. */
#ifdef BUGGY_ISM_TRANSITION
if ((old_state < NSM_TwoWay && state >= NSM_TwoWay) ||
(old_state >= NSM_TwoWay && state < NSM_TwoWay))
OSPF_ISM_EVENT_EXECUTE (oi, ISM_NeighborChange);
#else /* BUGGY_ISM_TRANSITION */
switch (oi->state) {
case ISM_DROther:
case ISM_Backup:
case ISM_DR:
if ((old_state < NSM_TwoWay && state >= NSM_TwoWay) ||
(old_state >= NSM_TwoWay && state < NSM_TwoWay))
OSPF_ISM_EVENT_EXECUTE (oi, ISM_NeighborChange);
break;
default:
/* ISM_PointToPoint -> ISM_Down, ISM_Loopback -> ISM_Down, etc. */
break;
}
#endif /* BUGGY_ISM_TRANSITION */
/* Performance hack. Send hello immideately when some neighbor enter
Init state. This whay we decrease neighbor discovery time. Gleb.*/
if (state == NSM_Init)
{
OSPF_ISM_TIMER_OFF (oi->t_hello);
OSPF_ISM_TIMER_ON (oi->t_hello, ospf_hello_timer, 1);
}
/* Preserve old status? */
}
/* Hook function called after ospf ISM event is occured. And vty's
network command invoke this function after making interface
structure. */
static void
ism_timer_set (struct ospf_interface *oi)
{
switch (oi->state)
{
case ISM_Down:
/* First entry point of ospf interface state machine. In this state
interface parameters must be set to initial values, and timers are
reset also. */
OSPF_ISM_TIMER_OFF (oi->t_hello);
OSPF_ISM_TIMER_OFF (oi->t_wait);
OSPF_ISM_TIMER_OFF (oi->t_ls_ack);
break;
case ISM_Loopback:
/* In this state, the interface may be looped back and will be
unavailable for regular data traffic. */
OSPF_ISM_TIMER_OFF (oi->t_hello);
OSPF_ISM_TIMER_OFF (oi->t_wait);
OSPF_ISM_TIMER_OFF (oi->t_ls_ack);
break;
case ISM_Waiting:
/* The router is trying to determine the identity of DRouter and
BDRouter. The router begin to receive and send Hello Packets. */
/* send first hello immediately */
OSPF_ISM_TIMER_MSEC_ON (oi->t_hello, ospf_hello_timer, 1);
OSPF_ISM_TIMER_ON (oi->t_wait, ospf_wait_timer,
OSPF_IF_PARAM (oi, v_wait));
OSPF_ISM_TIMER_OFF (oi->t_ls_ack);
break;
case ISM_PointToPoint:
/* The interface connects to a physical Point-to-point network or
virtual link. The router attempts to form an adjacency with
neighboring router. Hello packets are also sent. */
/* send first hello immediately */
OSPF_ISM_TIMER_MSEC_ON (oi->t_hello, ospf_hello_timer, 1);
OSPF_ISM_TIMER_OFF (oi->t_wait);
OSPF_ISM_TIMER_ON (oi->t_ls_ack, ospf_ls_ack_timer, oi->v_ls_ack);
break;
case ISM_DROther:
/* The network type of the interface is broadcast or NBMA network,
and the router itself is neither Designated Router nor
Backup Designated Router. */
OSPF_HELLO_TIMER_ON (oi);
OSPF_ISM_TIMER_OFF (oi->t_wait);
OSPF_ISM_TIMER_ON (oi->t_ls_ack, ospf_ls_ack_timer, oi->v_ls_ack);
break;
case ISM_Backup:
/* The network type of the interface is broadcast os NBMA network,
and the router is Backup Designated Router. */
OSPF_HELLO_TIMER_ON (oi);
OSPF_ISM_TIMER_OFF (oi->t_wait);
OSPF_ISM_TIMER_ON (oi->t_ls_ack, ospf_ls_ack_timer, oi->v_ls_ack);
break;
case ISM_DR:
/* The network type of the interface is broadcast or NBMA network,
and the router is Designated Router. */
OSPF_HELLO_TIMER_ON (oi);
OSPF_ISM_TIMER_OFF (oi->t_wait);
OSPF_ISM_TIMER_ON (oi->t_ls_ack, ospf_ls_ack_timer, oi->v_ls_ack);
break;
}
}
void
nsm_change_status (struct ospf_neighbor *nbr, int status)
{
int old_status;
struct ospf_interface *oi;
struct ospf_area *vl_area = NULL;
/* Logging change of status. */
if (IS_DEBUG_OSPF (nsm, NSM_STATUS))
zlog_info ("NSM[%s:%s]: Status change %s -> %s",
IF_NAME (nbr->oi), inet_ntoa (nbr->router_id),
LOOKUP (ospf_nsm_status_msg, nbr->status),
LOOKUP (ospf_nsm_status_msg, status));
/* Preserve old status. */
old_status = nbr->status;
/* Change to new status. */
nbr->status = status;
/* Statistics. */
nbr->state_change++;
oi = nbr->oi;
if (oi->type == OSPF_IFTYPE_VIRTUALLINK)
vl_area = ospf_area_lookup_by_area_id (oi->vl_data->vl_area_id);
/* One of the neighboring routers changes to/from the FULL state. */
if ((old_status != NSM_Full && status == NSM_Full) ||
(old_status == NSM_Full && status != NSM_Full))
{
if (status == NSM_Full)
{
oi->full_nbrs++;
oi->area->full_nbrs++;
ospf_check_abr_status ();
if (oi->type == OSPF_IFTYPE_VIRTUALLINK && vl_area)
if (++vl_area->full_vls == 1)
ospf_schedule_abr_task ();
}
else
{
oi->full_nbrs--;
oi->area->full_nbrs--;
ospf_check_abr_status ();
if (oi->type == OSPF_IFTYPE_VIRTUALLINK && vl_area)
if (vl_area->full_vls > 0)
if (--vl_area->full_vls == 0)
ospf_schedule_abr_task ();
/* clear neighbor retransmit list */
if (!ospf_ls_retransmit_isempty (nbr))
ospf_ls_retransmit_clear (nbr);
}
zlog_info ("nsm_change_status(): "
"scheduling new router-LSA origination");
ospf_router_lsa_timer_add (oi->area);
if (oi->type == OSPF_IFTYPE_VIRTUALLINK)
{
struct ospf_area *vl_area =
ospf_area_lookup_by_area_id (oi->vl_data->vl_area_id);
if (vl_area)
ospf_router_lsa_timer_add (vl_area);
}
/* Originate network-LSA. */
if (oi->status == ISM_DR)
{
if (oi->network_lsa_self && oi->full_nbrs == 0)
{
ospf_lsa_flush_area (oi->network_lsa_self, oi->area);
ospf_lsa_unlock (oi->network_lsa_self);
oi->network_lsa_self = NULL;
OSPF_TIMER_OFF (oi->t_network_lsa_self);
}
else
ospf_network_lsa_timer_add (oi);
}
}
/* Start DD exchange protocol */
if (status == NSM_ExStart)
{
if (nbr->dd_seqnum == 0)
nbr->dd_seqnum = time (NULL);
else
nbr->dd_seqnum++;
nbr->dd_flags = OSPF_DD_FLAG_I|OSPF_DD_FLAG_M|OSPF_DD_FLAG_MS;
ospf_db_desc_send (nbr);
}
/* clear cryptographic sequence number */
if (status == NSM_Down)
nbr->crypt_seqnum = 0;
/* Generete NeighborChange ISM event. */
if ((old_status < NSM_TwoWay && status >= NSM_TwoWay) ||
(old_status >= NSM_TwoWay && status < NSM_TwoWay))
OSPF_ISM_EVENT_EXECUTE (oi, ISM_NeighborChange);
/* Performance hack. Send hello immideately when some neighbor enter
Init state. This whay we decrease neighbor discovery time. Gleb.*/
if (status == NSM_Init)
{
OSPF_ISM_TIMER_OFF (oi->t_hello);
OSPF_ISM_TIMER_ON (oi->t_hello, ospf_hello_timer, 1);
}
/* Preserve old status? */
}
