void
ospf_abr_process_network_rt (struct ospf *ospf,
struct route_table *rt)
{
struct ospf_area *area;
struct ospf_route *or;
struct route_node *rn;
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_network_rt(): Start");
for (rn = route_top (rt); rn; rn = route_next (rn))
{
if ((or = rn->info) == NULL)
continue;
if (!(area = ospf_area_lookup_by_area_id (ospf, or->u.std.area_id)))
{
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_network_rt(): area %s no longer exists",
inet_ntoa (or->u.std.area_id));
continue;
}
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_network_rt(): this is a route to %s/%d",
inet_ntoa (rn->p.u.prefix4), rn->p.prefixlen);
if (or->path_type >= OSPF_PATH_TYPE1_EXTERNAL)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_network_rt(): "
"this is an External router, skipping");
continue;
}
if (or->cost >= OSPF_LS_INFINITY)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_network_rt():"
" this route's cost is infinity, skipping");
continue;
}
if (or->type == OSPF_DESTINATION_DISCARD)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_network_rt():"
" this is a discard entry, skipping");
continue;
}
if (or->path_type == OSPF_PATH_INTRA_AREA &&
!ospf_abr_should_announce (ospf, &rn->p, or))
{
if (IS_DEBUG_OSPF_EVENT)
zlog_info("ospf_abr_process_network_rt(): denied by export-list");
continue;
}
if (or->path_type == OSPF_PATH_INTRA_AREA &&
!ospf_abr_plist_out_check (area, or, &rn->p))
{
if (IS_DEBUG_OSPF_EVENT)
zlog_info("ospf_abr_process_network_rt(): denied by prefix-list");
continue;
}
if ((or->path_type == OSPF_PATH_INTER_AREA) &&
!OSPF_IS_AREA_ID_BACKBONE (or->u.std.area_id))
{
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_network_rt():"
" this is route is not backbone one, skipping");
continue;
}
if ((ospf->abr_type == OSPF_ABR_CISCO) ||
(ospf->abr_type == OSPF_ABR_IBM))
if (!ospf_act_bb_connection (ospf) &&
or->path_type != OSPF_PATH_INTRA_AREA)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_network_rt(): ALT ABR: "
"No BB connection, skip not intra-area routes");
continue;
}
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_network_rt(): announcing");
ospf_abr_announce_network (ospf, rn, or);
}
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_network_rt(): Stop");
}
static void
ospf_update_network_route (struct ospf *ospf,
struct route_table *rt,
struct route_table *rtrs,
struct summary_lsa *lsa,
struct prefix_ipv4 *p,
struct ospf_area *area)
{
struct route_node *rn;
struct ospf_route *or, *abr_or, *new_or;
struct prefix_ipv4 abr;
u_int32_t cost;
abr.family = AF_INET;
abr.prefix =lsa->header.adv_router;
abr.prefixlen = IPV4_MAX_BITLEN;
apply_mask_ipv4 (&abr);
abr_or = ospf_find_abr_route (rtrs, &abr, area);
if (abr_or == NULL)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_debug ("ospf_update_network_route(): can't find a route to the ABR");
return;
}
cost = abr_or->cost + GET_METRIC (lsa->metric);
rn = route_node_lookup (rt, (struct prefix *) p);
if (! rn)
{
if (ospf->abr_type != OSPF_ABR_SHORTCUT)
return; /* Standard ABR can update only already installed
backbone paths */
if (IS_DEBUG_OSPF_EVENT)
zlog_debug ("ospf_update_network_route(): "
"Allowing Shortcut ABR to add new route");
new_or = ospf_route_new ();
new_or->type = OSPF_DESTINATION_NETWORK;
new_or->id = lsa->header.id;
new_or->mask = lsa->mask;
new_or->u.std.options = lsa->header.options;
new_or->u.std.origin = (struct lsa_header *) lsa;
new_or->cost = cost;
new_or->u.std.area_id = area->area_id;
new_or->u.std.external_routing = area->external_routing;
new_or->path_type = OSPF_PATH_INTER_AREA;
ospf_route_add (rt, p, new_or, abr_or);
return;
}
else
{
route_unlock_node (rn);
if (rn->info == NULL)
return;
}
or = rn->info;
if (or->path_type != OSPF_PATH_INTRA_AREA &&
or->path_type != OSPF_PATH_INTER_AREA)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_debug ("ospf_update_network_route(): ERR: path type is wrong");
return;
}
if (ospf->abr_type == OSPF_ABR_SHORTCUT)
{
if (or->path_type == OSPF_PATH_INTRA_AREA &&
!OSPF_IS_AREA_ID_BACKBONE (or->u.std.area_id))
{
if (IS_DEBUG_OSPF_EVENT)
zlog_debug ("ospf_update_network_route(): Shortcut: "
"this intra-area path is not backbone");
return;
}
}
else /* Not Shortcut ABR */
{
if (!OSPF_IS_AREA_ID_BACKBONE (or->u.std.area_id))
{
if (IS_DEBUG_OSPF_EVENT)
zlog_debug ("ospf_update_network_route(): "
"route is not BB-associated");
return; /* We can update only BB routes */
}
}
if (or->cost < cost)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_debug ("ospf_update_network_route(): new route is worse");
return;
}
if (or->cost == cost)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_debug ("ospf_update_network_route(): "
"new route is same distance, adding nexthops");
ospf_route_copy_nexthops (or, abr_or->paths);
}
if (or->cost > cost)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_debug ("ospf_update_network_route(): "
"new route is better, overriding nexthops");
ospf_route_subst_nexthops (or, abr_or->paths);
or->cost = cost;
if ((ospf->abr_type == OSPF_ABR_SHORTCUT) &&
!OSPF_IS_AREA_ID_BACKBONE (or->u.std.area_id))
{
or->path_type = OSPF_PATH_INTER_AREA;
or->u.std.area_id = area->area_id;
or->u.std.external_routing = area->external_routing;
/* Note that we can do this only in Shortcut ABR mode,
because standard ABR must leave the route type and area
unchanged
*/
}
}
}
void
ospf_abr_process_router_rt (struct ospf *ospf, struct route_table *rt)
{
struct ospf_route *or;
struct route_node *rn;
struct list *l;
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_router_rt(): Start");
for (rn = route_top (rt); rn; rn = route_next (rn))
{
listnode node;
char flag = 0;
struct ospf_route *best = NULL;
if (rn->info == NULL)
continue;
l = rn->info;
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_router_rt(): this is a route to %s",
inet_ntoa (rn->p.u.prefix4));
for (node = listhead (l); node; nextnode (node))
{
or = getdata (node);
if (or == NULL)
continue;
if (!ospf_area_lookup_by_area_id (ospf, or->u.std.area_id))
{
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_router_rt(): area %s no longer exists",
inet_ntoa (or->u.std.area_id));
continue;
}
if (!CHECK_FLAG (or->u.std.flags, ROUTER_LSA_EXTERNAL))
{
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_router_rt(): "
"This is not an ASBR, skipping");
continue;
}
if (!flag)
{
best = ospf_find_asbr_route (ospf, rt,
(struct prefix_ipv4 *) &rn->p);
flag = 1;
}
if (best == NULL)
continue;
if (or != best)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_router_rt(): "
"This route is not the best among possible, skipping");
continue;
}
if (or->path_type == OSPF_PATH_INTER_AREA &&
!OSPF_IS_AREA_ID_BACKBONE (or->u.std.area_id))
{
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_router_rt(): "
"This route is not a backbone one, skipping");
continue;
}
if (or->cost >= OSPF_LS_INFINITY)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_router_rt(): "
"This route has LS_INFINITY metric, skipping");
continue;
}
if (ospf->abr_type == OSPF_ABR_CISCO
|| ospf->abr_type == OSPF_ABR_IBM)
if (!ospf_act_bb_connection (ospf)
&& or->path_type != OSPF_PATH_INTRA_AREA)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_info("ospf_abr_process_network_rt(): ALT ABR: "
"No BB connection, skip not intra-area routes");
continue;
}
ospf_abr_announce_rtr (ospf, (struct prefix_ipv4 *) &rn->p, or);
}
}
if (IS_DEBUG_OSPF_EVENT)
zlog_info ("ospf_abr_process_router_rt(): Stop");
}
