/* Delete specified OSPF neighbor from interface. */
void ospf_nbr_delete(struct ospf_neighbor *nbr)
{
struct ospf_interface *oi;
struct route_node *rn;
struct prefix p;
oi = nbr->oi;
/* get appropriate prefix 'key' */
ospf_nbr_key(oi, nbr, &p);
rn = route_node_lookup(oi->nbrs, &p);
if (rn) {
/* If lookup for a NBR succeeds, the leaf route_node could
* only exist because there is (or was) a nbr there.
* If the nbr was deleted, the leaf route_node should have
* lost its last refcount too, and be deleted.
* Therefore a looked-up leaf route_node in nbrs table
* should never have NULL info.
*/
assert(rn->info);
if (rn->info) {
rn->info = NULL;
route_unlock_node(rn);
} else
zlog_info("Can't find neighbor %s in the interface %s",
inet_ntoa(nbr->src), IF_NAME(oi));
route_unlock_node(rn);
}
/* Free ospf_neighbor structure. */
ospf_nbr_free(nbr);
}
/* Add self to nbr list. */
void ospf_nbr_add_self(struct ospf_interface *oi, struct in_addr router_id)
{
struct prefix p;
struct route_node *rn;
if (!oi->nbr_self)
oi->nbr_self = ospf_nbr_new(oi);
/* Initial state */
oi->nbr_self->address = *oi->address;
oi->nbr_self->priority = OSPF_IF_PARAM(oi, priority);
oi->nbr_self->router_id = router_id;
oi->nbr_self->src = oi->address->u.prefix4;
oi->nbr_self->state = NSM_TwoWay;
switch (oi->area->external_routing) {
case OSPF_AREA_DEFAULT:
SET_FLAG(oi->nbr_self->options, OSPF_OPTION_E);
break;
case OSPF_AREA_STUB:
UNSET_FLAG(oi->nbr_self->options, OSPF_OPTION_E);
break;
case OSPF_AREA_NSSA:
UNSET_FLAG(oi->nbr_self->options, OSPF_OPTION_E);
SET_FLAG(oi->nbr_self->options, OSPF_OPTION_NP);
break;
}
/* Add nbr_self to nbrs table */
ospf_nbr_key(oi, oi->nbr_self, &p);
rn = route_node_get(oi->nbrs, &p);
if (rn->info) {
/* There is already pseudo neighbor. */
zlog_warn(
"router_id %s already present in neighbor table. node refcount %u",
inet_ntoa(router_id), rn->lock);
route_unlock_node(rn);
} else
rn->info = oi->nbr_self;
}
/* Add self to nbr list. */
void
ospf_nbr_add_self (struct ospf_interface *oi)
{
struct prefix p;
struct route_node *rn;
/* Initial state */
oi->nbr_self->address = *oi->address;
oi->nbr_self->priority = OSPF_IF_PARAM (oi, priority);
oi->nbr_self->router_id = oi->ospf->router_id;
oi->nbr_self->src = oi->address->u.prefix4;
oi->nbr_self->state = NSM_TwoWay;
switch (oi->area->external_routing)
{
case OSPF_AREA_DEFAULT:
SET_FLAG (oi->nbr_self->options, OSPF_OPTION_E);
break;
case OSPF_AREA_STUB:
UNSET_FLAG (oi->nbr_self->options, OSPF_OPTION_E);
break;
case OSPF_AREA_NSSA:
UNSET_FLAG (oi->nbr_self->options, OSPF_OPTION_E);
SET_FLAG (oi->nbr_self->options, OSPF_OPTION_NP);
break;
}
/* Add nbr_self to nbrs table */
ospf_nbr_key (oi, oi->nbr_self, &p);
rn = route_node_get (oi->nbrs, &p);
if (rn->info)
{
/* There is already pseudo neighbor. */
assert (oi->nbr_self == rn->info);
route_unlock_node (rn);
}
else
rn->info = oi->nbr_self;
}
/* Delete specified OSPF neighbor from interface. */
void ospf_nbr_delete(struct ospf_neighbor *nbr)
{
struct ospf_interface *oi;
struct route_node *rn;
struct prefix p;
oi = nbr->oi;
/* get appropriate prefix 'key' */
ospf_nbr_key(oi, nbr, &p);
rn = route_node_lookup(oi->nbrs, &p);
if (rn) {
/* If lookup for a NBR succeeds, the leaf route_node could
* only exist because there is (or was) a nbr there.
* If the nbr was deleted, the leaf route_node should have
* lost its last refcount too, and be deleted.
* Therefore a looked-up leaf route_node in nbrs table
* should never have NULL info.
*/
assert(rn->info);
if (rn->info) {
rn->info = NULL;
route_unlock_node(rn);
} else
zlog_info("Can't find neighbor %s in the interface %s",
inet_ntoa(nbr->src), IF_NAME(oi));
route_unlock_node(rn);
} else {
/*
* This neighbor was not found, but before we move on and
* free the neighbor structre, make sure that it was not
* indexed incorrectly and ended up in the "worng" place
*/
/* Reverse the lookup rules */
if (oi->type == OSPF_IFTYPE_VIRTUALLINK
|| oi->type == OSPF_IFTYPE_POINTOPOINT)
p.u.prefix4 = nbr->src;
else
p.u.prefix4 = nbr->router_id;
rn = route_node_lookup(oi->nbrs, &p);
if (rn) {
/* We found the neighbor!
* Now make sure it is not the exact same neighbor
* structure that we are about to free
*/
if (nbr == rn->info) {
/* Same neighbor, drop the reference to it */
rn->info = NULL;
route_unlock_node(rn);
}
route_unlock_node(rn);
}
}
/* Free ospf_neighbor structure. */
ospf_nbr_free(nbr);
}