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ospf_asbr.c
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/*
* OSPF AS Boundary Router functions.
* Copyright (C) 1999, 2000 Kunihiro Ishiguro, Toshiaki Takada
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include "thread.h"
#include "memory.h"
#include "linklist.h"
#include "prefix.h"
#include "if.h"
#include "table.h"
#include "vty.h"
#include "filter.h"
#include "log.h"
#include "ospfd/ospfd.h"
#include "ospfd/ospf_interface.h"
#include "ospfd/ospf_asbr.h"
#include "ospfd/ospf_lsa.h"
#include "ospfd/ospf_lsdb.h"
#include "ospfd/ospf_neighbor.h"
#include "ospfd/ospf_spf.h"
#include "ospfd/ospf_flood.h"
#include "ospfd/ospf_route.h"
#include "ospfd/ospf_zebra.h"
#include "ospfd/ospf_dump.h"
#include "ospfd/ospf_errors.h"
/* Remove external route. */
void ospf_external_route_remove(struct ospf *ospf, struct prefix_ipv4 *p)
{
struct route_node *rn;
struct ospf_route * or ;
rn = route_node_lookup(ospf->old_external_route, (struct prefix *)p);
if (rn)
if ((or = rn->info)) {
zlog_info("Route[%pFX]: external path deleted", p);
/* Remove route from zebra. */
if (or->type == OSPF_DESTINATION_NETWORK)
ospf_zebra_delete(
ospf, (struct prefix_ipv4 *)&rn->p, or);
ospf_route_free(or);
rn->info = NULL;
route_unlock_node(rn);
route_unlock_node(rn);
return;
}
zlog_info("Route[%pFX]: no such external path", p);
}
/* Add an External info for AS-external-LSA. */
struct external_info *ospf_external_info_new(struct ospf *ospf, uint8_t type,
unsigned short instance)
{
struct external_info *new;
new = XCALLOC(MTYPE_OSPF_EXTERNAL_INFO, sizeof(struct external_info));
new->ospf = ospf;
new->type = type;
new->instance = instance;
new->to_be_processed = 0;
ospf_reset_route_map_set_values(&new->route_map_set);
return new;
}
static void ospf_external_info_free(struct external_info *ei)
{
XFREE(MTYPE_OSPF_EXTERNAL_INFO, ei);
}
void ospf_reset_route_map_set_values(struct route_map_set_values *values)
{
values->metric = -1;
values->metric_type = -1;
}
int ospf_route_map_set_compare(struct route_map_set_values *values1,
struct route_map_set_values *values2)
{
return values1->metric == values2->metric
&& values1->metric_type == values2->metric_type;
}
/* Add an External info for AS-external-LSA. */
struct external_info *
ospf_external_info_add(struct ospf *ospf, uint8_t type, unsigned short instance,
struct prefix_ipv4 p, ifindex_t ifindex,
struct in_addr nexthop, route_tag_t tag)
{
struct external_info *new;
struct route_node *rn;
struct ospf_external *ext;
ext = ospf_external_lookup(ospf, type, instance);
if (!ext)
ext = ospf_external_add(ospf, type, instance);
rn = route_node_get(EXTERNAL_INFO(ext), (struct prefix *)&p);
/* If old info exists, -- discard new one or overwrite with new one? */
if (rn && rn->info) {
new = rn->info;
if ((new->ifindex == ifindex)
&& (new->nexthop.s_addr == nexthop.s_addr)
&& (new->tag == tag)) {
route_unlock_node(rn);
return NULL; /* NULL => no LSA to refresh */
}
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE))
zlog_debug(
"Redistribute[%s][%d][%u]: %pFX discarding old info with NH %pI4.",
ospf_redist_string(type), instance,
ospf->vrf_id, &p, &nexthop.s_addr);
XFREE(MTYPE_OSPF_EXTERNAL_INFO, rn->info);
}
/* Create new External info instance. */
new = ospf_external_info_new(ospf, type, instance);
new->p = p;
new->ifindex = ifindex;
new->nexthop = nexthop;
new->tag = tag;
new->orig_tag = tag;
new->aggr_route = NULL;
/* we don't unlock rn from the get() because we're attaching the info */
if (rn)
rn->info = new;
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) {
zlog_debug(
"Redistribute[%s][%u]: %pFX external info created, with NH %pI4",
ospf_redist_string(type), ospf->vrf_id, &p,
&nexthop.s_addr);
}
return new;
}
void ospf_external_info_delete(struct ospf *ospf, uint8_t type,
unsigned short instance, struct prefix_ipv4 p)
{
struct route_node *rn;
struct ospf_external *ext;
ext = ospf_external_lookup(ospf, type, instance);
if (!ext)
return;
rn = route_node_lookup(EXTERNAL_INFO(ext), (struct prefix *)&p);
if (rn) {
ospf_external_info_free(rn->info);
rn->info = NULL;
route_unlock_node(rn);
route_unlock_node(rn);
}
}
struct external_info *ospf_external_info_lookup(struct ospf *ospf, uint8_t type,
unsigned short instance,
struct prefix_ipv4 *p)
{
struct route_node *rn;
struct ospf_external *ext;
ext = ospf_external_lookup(ospf, type, instance);
if (!ext)
return NULL;
rn = route_node_lookup(EXTERNAL_INFO(ext), (struct prefix *)p);
if (rn) {
route_unlock_node(rn);
if (rn->info)
return rn->info;
}
return NULL;
}
struct ospf_lsa *ospf_external_info_find_lsa(struct ospf *ospf,
struct prefix_ipv4 *p)
{
struct ospf_lsa *lsa;
struct as_external_lsa *al;
struct in_addr mask, id;
/* First search the lsdb with address specific LSID
* where all the host bits are set, if there a matched
* LSA, return.
* Ex: For route 10.0.0.0/16, LSID is 10.0.255.255
* If no lsa with above LSID, use received address as
* LSID and check if any LSA in LSDB.
* If LSA found, check if the mask is same b/w the matched
* LSA and received prefix, if same then it is the LSA for
* this prefix.
* Ex: For route 10.0.0.0/16, LSID is 10.0.0.0
*/
masklen2ip(p->prefixlen, &mask);
id.s_addr = p->prefix.s_addr | (~mask.s_addr);
lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, OSPF_AS_EXTERNAL_LSA, id,
ospf->router_id);
if (lsa) {
if (p->prefixlen == IPV4_MAX_BITLEN) {
al = (struct as_external_lsa *)lsa->data;
if (mask.s_addr != al->mask.s_addr)
return NULL;
}
return lsa;
}
lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
p->prefix, ospf->router_id);
if (lsa) {
al = (struct as_external_lsa *)lsa->data;
if (mask.s_addr == al->mask.s_addr)
return lsa;
}
return NULL;
}
/* Update ASBR status. */
void ospf_asbr_status_update(struct ospf *ospf, uint8_t status)
{
zlog_info("ASBR[%s:Status:%d]: Update",
ospf_get_name(ospf), status);
/* ASBR on. */
if (status) {
/* Already ASBR. */
if (IS_OSPF_ASBR(ospf)) {
zlog_info("ASBR[%s:Status:%d]: Already ASBR",
ospf_get_name(ospf), status);
return;
}
SET_FLAG(ospf->flags, OSPF_FLAG_ASBR);
} else {
/* Already non ASBR. */
if (!IS_OSPF_ASBR(ospf)) {
zlog_info("ASBR[%s:Status:%d]: Already non ASBR",
ospf_get_name(ospf), status);
return;
}
UNSET_FLAG(ospf->flags, OSPF_FLAG_ASBR);
}
/* Transition from/to status ASBR, schedule timer. */
ospf_spf_calculate_schedule(ospf, SPF_FLAG_ASBR_STATUS_CHANGE);
ospf_router_lsa_update(ospf);
}
/* If there's redistribution configured, we need to refresh external
* LSAs in order to install Type-7 and flood to all NSSA Areas
*/
static void ospf_asbr_nssa_redist_update_timer(struct thread *thread)
{
struct ospf *ospf = THREAD_ARG(thread);
int type;
ospf->t_asbr_nssa_redist_update = NULL;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("Running ASBR NSSA redistribution update on timer");
for (type = 0; type < ZEBRA_ROUTE_MAX; type++) {
struct list *red_list;
struct listnode *node;
struct ospf_redist *red;
red_list = ospf->redist[type];
if (!red_list)
continue;
for (ALL_LIST_ELEMENTS_RO(red_list, node, red))
ospf_external_lsa_refresh_type(ospf, type,
red->instance,
LSA_REFRESH_FORCE);
}
ospf_external_lsa_refresh_default(ospf);
}
void ospf_schedule_asbr_nssa_redist_update(struct ospf *ospf)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("Scheduling ASBR NSSA redistribution update");
thread_add_timer(master, ospf_asbr_nssa_redist_update_timer, ospf,
OSPF_ASBR_NSSA_REDIST_UPDATE_DELAY,
&ospf->t_asbr_nssa_redist_update);
}
void ospf_redistribute_withdraw(struct ospf *ospf, uint8_t type,
unsigned short instance)
{
struct route_node *rn;
struct external_info *ei;
struct ospf_external *ext;
ext = ospf_external_lookup(ospf, type, instance);
if (!ext)
return;
/* Delete external info for specified type. */
if (!EXTERNAL_INFO(ext))
return;
for (rn = route_top(EXTERNAL_INFO(ext)); rn; rn = route_next(rn)) {
ei = rn->info;
if (!ei)
continue;
struct ospf_external_aggr_rt *aggr;
if (is_default_prefix4(&ei->p)
&& ospf->default_originate != DEFAULT_ORIGINATE_NONE)
continue;
aggr = ei->aggr_route;
if (aggr)
ospf_unlink_ei_from_aggr(ospf, aggr, ei);
else if (ospf_external_info_find_lsa(ospf, &ei->p))
ospf_external_lsa_flush(ospf, type, &ei->p,
ei->ifindex /*, ei->nexthop */);
ospf_external_info_free(ei);
route_unlock_node(rn);
rn->info = NULL;
}
}
/* External Route Aggregator Handlers */
bool is_valid_summary_addr(struct prefix_ipv4 *p)
{
/* Default prefix validation*/
if (p->prefix.s_addr == INADDR_ANY)
return false;
/*Host route shouldn't be configured as summary addres*/
if (p->prefixlen == IPV4_MAX_BITLEN)
return false;
return true;
}
void ospf_asbr_external_aggregator_init(struct ospf *instance)
{
instance->rt_aggr_tbl = route_table_init();
instance->t_external_aggr = NULL;
instance->aggr_action = 0;
instance->aggr_delay_interval = OSPF_EXTL_AGGR_DEFAULT_DELAY;
}
static unsigned int ospf_external_rt_hash_key(const void *data)
{
const struct external_info *ei = data;
unsigned int key = 0;
key = prefix_hash_key(&ei->p);
return key;
}
static bool ospf_external_rt_hash_cmp(const void *d1, const void *d2)
{
const struct external_info *ei1 = d1;
const struct external_info *ei2 = d2;
return prefix_same((struct prefix *)&ei1->p, (struct prefix *)&ei2->p);
}
static struct ospf_external_aggr_rt *
ospf_external_aggregator_new(struct prefix_ipv4 *p)
{
struct ospf_external_aggr_rt *aggr;
aggr = (struct ospf_external_aggr_rt *)XCALLOC(
MTYPE_OSPF_EXTERNAL_RT_AGGR,
sizeof(struct ospf_external_aggr_rt));
if (!aggr)
return NULL;
aggr->p.family = p->family;
aggr->p.prefix = p->prefix;
aggr->p.prefixlen = p->prefixlen;
aggr->match_extnl_hash = hash_create(ospf_external_rt_hash_key,
ospf_external_rt_hash_cmp,
"Ospf external route hash");
return aggr;
}
static void ospf_aggr_handle_external_info(void *data)
{
struct external_info *ei = (struct external_info *)data;
struct ospf_external_aggr_rt *aggr = NULL;
struct ospf *ospf = ei->ospf;
struct ospf_lsa *lsa = NULL;
ei->aggr_route = NULL;
ei->to_be_processed = true;
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug("%s: Handle extrenal route(%pI4/%d)", __func__,
&ei->p.prefix, ei->p.prefixlen);
assert(ospf);
if (!ospf_redistribute_check(ospf, ei, NULL))
return;
aggr = ospf_external_aggr_match(ospf, &ei->p);
if (aggr) {
(void)ospf_originate_summary_lsa(ospf, aggr, ei);
return;
}
lsa = ospf_external_info_find_lsa(ospf, &ei->p);
if (lsa)
ospf_external_lsa_refresh(ospf, lsa, ei, LSA_REFRESH_FORCE, 1);
else
(void)ospf_external_lsa_originate(ospf, ei);
}
static void ospf_aggr_unlink_external_info(void *data)
{
struct external_info *ei = (struct external_info *)data;
ei->aggr_route = NULL;
ei->to_be_processed = true;
}
void ospf_external_aggregator_free(struct ospf_external_aggr_rt *aggr)
{
if (OSPF_EXTERNAL_RT_COUNT(aggr))
hash_clean(aggr->match_extnl_hash,
(void *)ospf_aggr_unlink_external_info);
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug("%s: Release the aggregator Address(%pI4/%d)",
__func__, &aggr->p.prefix, aggr->p.prefixlen);
hash_free(aggr->match_extnl_hash);
aggr->match_extnl_hash = NULL;
XFREE(MTYPE_OSPF_EXTERNAL_RT_AGGR, aggr);
}
static void ospf_external_aggr_add(struct ospf *ospf,
struct ospf_external_aggr_rt *aggr)
{
struct route_node *rn;
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug("%s: Adding Aggregate route to Aggr table (%pI4/%d)",
__func__, &aggr->p.prefix, aggr->p.prefixlen);
rn = route_node_get(ospf->rt_aggr_tbl, (struct prefix *)&aggr->p);
if (rn->info)
route_unlock_node(rn);
else
rn->info = aggr;
}
static void ospf_external_aggr_delete(struct ospf *ospf, struct route_node *rn)
{
struct ospf_external_aggr_rt *aggr = rn->info;
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug("%s: Deleting Aggregate route (%pI4/%d)", __func__,
&aggr->p.prefix, aggr->p.prefixlen);
/* Sent a Max age LSA if it is already originated. */
if (CHECK_FLAG(aggr->flags, OSPF_EXTERNAL_AGGRT_ORIGINATED)) {
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug("%s: Flushing Aggregate route (%pI4/%d)",
__func__, &aggr->p.prefix,
aggr->p.prefixlen);
ospf_external_lsa_flush(ospf, 0, &aggr->p, 0);
}
rn->info = NULL;
route_unlock_node(rn);
}
struct ospf_external_aggr_rt *
ospf_extrenal_aggregator_lookup(struct ospf *ospf, struct prefix_ipv4 *p)
{
struct route_node *rn;
struct ospf_external_aggr_rt *summary_rt = NULL;
rn = route_node_lookup(ospf->rt_aggr_tbl, (struct prefix *)p);
if (rn) {
summary_rt = rn->info;
route_unlock_node(rn);
return summary_rt;
}
return NULL;
}
struct ospf_external_aggr_rt *ospf_external_aggr_match(struct ospf *ospf,
struct prefix_ipv4 *p)
{
struct route_node *node;
struct ospf_external_aggr_rt *summary_rt = NULL;
node = route_node_match(ospf->rt_aggr_tbl, (struct prefix *)p);
if (node) {
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
if (node->info) {
struct ospf_external_aggr_rt *ag = node->info;
zlog_debug(
"%s: Matching aggregator found.prefix:%pI4/%d Aggregator %pI4/%d",
__func__, &p->prefix, p->prefixlen,
&ag->p.prefix, ag->p.prefixlen);
}
summary_rt = node->info;
route_unlock_node(node);
return summary_rt;
}
return NULL;
}
void ospf_unlink_ei_from_aggr(struct ospf *ospf,
struct ospf_external_aggr_rt *aggr,
struct external_info *ei)
{
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug(
"%s: Unlinking extrenal route(%pI4/%d) from aggregator(%pI4/%d), external route count:%ld",
__func__, &ei->p.prefix, ei->p.prefixlen,
&aggr->p.prefix, aggr->p.prefixlen,
OSPF_EXTERNAL_RT_COUNT(aggr));
hash_release(aggr->match_extnl_hash, ei);
ei->aggr_route = NULL;
/* Flush the aggreagte route if matching
* external route count becomes zero.
*/
if (!OSPF_EXTERNAL_RT_COUNT(aggr)
&& CHECK_FLAG(aggr->flags, OSPF_EXTERNAL_AGGRT_ORIGINATED)) {
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug("%s: Flushing the aggreagte route (%pI4/%d)",
__func__, &aggr->p.prefix,
aggr->p.prefixlen);
/* Flush the aggregate LSA */
ospf_external_lsa_flush(ospf, 0, &aggr->p, 0);
/* Unset the Origination flag */
UNSET_FLAG(aggr->flags, OSPF_EXTERNAL_AGGRT_ORIGINATED);
}
}
static void ospf_link_ei_to_aggr(struct ospf_external_aggr_rt *aggr,
struct external_info *ei)
{
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug(
"%s: Linking extrenal route(%pI4/%d) to aggregator(%pI4/%d)",
__func__, &ei->p.prefix, ei->p.prefixlen,
&aggr->p.prefix, aggr->p.prefixlen);
hash_get(aggr->match_extnl_hash, ei, hash_alloc_intern);
ei->aggr_route = aggr;
}
struct ospf_lsa *ospf_originate_summary_lsa(struct ospf *ospf,
struct ospf_external_aggr_rt *aggr,
struct external_info *ei)
{
struct ospf_lsa *lsa;
struct external_info ei_aggr;
struct as_external_lsa *asel;
struct ospf_external_aggr_rt *old_aggr;
route_tag_t tag = 0;
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug("%s: Prepare to originate Summary route(%pI4/%d)",
__func__, &aggr->p.prefix, aggr->p.prefixlen);
/* This case to handle when the overlapping aggregator address
* is availbe.Best match will be considered.So need to delink
* from old aggregator and link to the new aggr.
*/
if (ei->aggr_route) {
if (ei->aggr_route != aggr) {
old_aggr = ei->aggr_route;
ospf_unlink_ei_from_aggr(ospf, old_aggr, ei);
}
}
/* Add the external route to hash table */
ospf_link_ei_to_aggr(aggr, ei);
lsa = ospf_external_info_find_lsa(ospf, &aggr->p);
/* Don't originate external LSA,
* If it is configured not to advertise.
*/
if (CHECK_FLAG(aggr->flags, OSPF_EXTERNAL_AGGRT_NO_ADVERTISE)) {
/* If it is already originated as external LSA,
* But, it is configured not to advertise then
* flush the originated external lsa.
*/
if (lsa)
ospf_external_lsa_flush(ospf, 0, &aggr->p, 0);
UNSET_FLAG(aggr->flags, OSPF_EXTERNAL_AGGRT_ORIGINATED);
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug(
"%s: Don't originate the summary address,It is configured to not-advertise.",
__func__);
return NULL;
}
/* Prepare the extrenal_info for aggregator */
memset(&ei_aggr, 0, sizeof(struct external_info));
ei_aggr.p = aggr->p;
ei_aggr.tag = aggr->tag;
ei_aggr.type = 0;
ei_aggr.instance = ospf->instance;
ei_aggr.route_map_set.metric = -1;
ei_aggr.route_map_set.metric_type = -1;
/* Summary route already originated,
* So, Do nothing.
*/
if (CHECK_FLAG(aggr->flags, OSPF_EXTERNAL_AGGRT_ORIGINATED)) {
if (!lsa) {
flog_warn(EC_OSPF_LSA_MISSING,
"%s: Could not refresh/originate %pI4/%d",
__func__, &aggr->p.prefix, aggr->p.prefixlen);
return NULL;
}
asel = (struct as_external_lsa *)lsa->data;
tag = (unsigned long)ntohl(asel->e[0].route_tag);
/* If tag modified , then re-originate the route
* with modified tag details.
*/
if (tag != ei_aggr.tag) {
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug(
"%s: Route tag changed(old:%d new:%d,So refresh the summary route.(%pI4/%d)",
__func__, tag, ei_aggr.tag,
&aggr->p.prefix, aggr->p.prefixlen);
ospf_external_lsa_refresh(ospf, lsa, &ei_aggr,
LSA_REFRESH_FORCE, 1);
}
return lsa;
}
if (lsa && IS_LSA_MAXAGE(lsa)) {
/* This is special case.
* If a summary route need to be originated but where
* summary route already exist in lsdb with maxage, then
* it need to be refreshed.
*/
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug(
"%s: LSA is in MAX-AGE so refreshing LSA(%pI4/%d)",
__func__, &aggr->p.prefix, aggr->p.prefixlen);
ospf_external_lsa_refresh(ospf, lsa, &ei_aggr,
LSA_REFRESH_FORCE, 1);
SET_FLAG(aggr->flags, OSPF_EXTERNAL_AGGRT_ORIGINATED);
return lsa;
}
/* If the external route prefix same as aggregate route
* and if external route is already originated as TYPE-5
* then it need to be refreshed and originate bit should
* be set.
*/
if (lsa && prefix_same((struct prefix *)&ei_aggr.p,
(struct prefix *)&ei->p)) {
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug(
"%s: External route prefix is same as aggr so refreshing LSA(%pI4/%d)",
__func__, &aggr->p.prefix, aggr->p.prefixlen);
ospf_external_lsa_refresh(ospf, lsa, &ei_aggr,
LSA_REFRESH_FORCE, 1);
SET_FLAG(aggr->flags, OSPF_EXTERNAL_AGGRT_ORIGINATED);
return lsa;
}
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug("%s: Originate Summary route(%pI4/%d)", __func__,
&aggr->p.prefix, aggr->p.prefixlen);
/* Originate summary LSA */
lsa = ospf_external_lsa_originate(ospf, &ei_aggr);
if (lsa) {
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug("%s: Set the origination bit for aggregator",
__func__);
SET_FLAG(aggr->flags, OSPF_EXTERNAL_AGGRT_ORIGINATED);
}
return lsa;
}
void ospf_unset_all_aggr_flag(struct ospf *ospf)
{
struct route_node *rn = NULL;
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug("Unset the origination bit for all aggregator");
for (rn = route_top(ospf->rt_aggr_tbl); rn; rn = route_next(rn)) {
if (!rn->info)
continue;
struct ospf_external_aggr_rt *aggr = rn->info;
UNSET_FLAG(aggr->flags, OSPF_EXTERNAL_AGGRT_ORIGINATED);
}
}
static void ospf_delete_all_marked_aggregators(struct ospf *ospf)
{
struct route_node *rn = NULL;
/* Loop through all the aggregators, Delete all aggregators
* which are marked as DELETE. Set action to NONE for remaining
* aggregators
*/
for (rn = route_top(ospf->rt_aggr_tbl); rn; rn = route_next(rn)) {
if (!rn->info)
continue;
struct ospf_external_aggr_rt *aggr = rn->info;
if (aggr->action != OSPF_ROUTE_AGGR_DEL) {
aggr->action = OSPF_ROUTE_AGGR_NONE;
continue;
}
ospf_external_aggr_delete(ospf, rn);
ospf_external_aggregator_free(aggr);
}
}
static void ospf_handle_aggregated_exnl_rt(struct ospf *ospf,
struct ospf_external_aggr_rt *aggr,
struct external_info *ei)
{
struct ospf_lsa *lsa;
struct as_external_lsa *al;
struct in_addr mask;
/* Handling the case where the external route prefix
* and aggregate prefix is same
* If same don't flush the originated external LSA.
*/
if (prefix_same((struct prefix *)&aggr->p, (struct prefix *)&ei->p)) {
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug(
"%s: External Route prefix same as Aggregator(%pI4/%d), so don't flush.",
__func__, &ei->p.prefix, ei->p.prefixlen);
return;
}
lsa = ospf_external_info_find_lsa(ospf, &ei->p);
if (lsa) {
al = (struct as_external_lsa *)lsa->data;
masklen2ip(ei->p.prefixlen, &mask);
if (mask.s_addr != al->mask.s_addr)
return;
ospf_external_lsa_flush(ospf, ei->type, &ei->p, 0);
}
}
static void ospf_handle_exnl_rt_after_aggr_del(struct ospf *ospf,
struct external_info *ei)
{
struct ospf_lsa *lsa;
/* Process only marked external routes.
* These routes were part of a deleted
* aggregator.So, originate now.
*/
if (!ei->to_be_processed)
return;
ei->to_be_processed = false;
lsa = ospf_external_info_find_lsa(ospf, &ei->p);
if (lsa)
ospf_external_lsa_refresh(ospf, lsa, ei, LSA_REFRESH_FORCE, 0);
else {
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug("%s: Originate external route(%pI4/%d)",
__func__, &ei->p.prefix, ei->p.prefixlen);
ospf_external_lsa_originate(ospf, ei);
}
}
static void ospf_handle_external_aggr_add(struct ospf *ospf)
{
struct external_info *ei;
struct route_node *rn = NULL;
struct route_table *rt = NULL;
int type = 0;
/* Delete all the aggregators which are marked as
* OSPF_ROUTE_AGGR_DEL.
*/
ospf_delete_all_marked_aggregators(ospf);
for (type = 0; type <= ZEBRA_ROUTE_MAX; type++) {
struct list *ext_list;
struct listnode *node;
struct ospf_external *ext;
struct ospf_external_aggr_rt *aggr;
ext_list = ospf->external[type];
if (!ext_list)
continue;
for (ALL_LIST_ELEMENTS_RO(ext_list, node, ext)) {
rt = ext->external_info;
if (!rt)
continue;
for (rn = route_top(rt); rn; rn = route_next(rn)) {
if (!rn->info)
continue;
ei = rn->info;
if (is_default_prefix4(&ei->p))
continue;
/* Check the AS-external-LSA
* should be originated.
*/
if (!ospf_redistribute_check(ospf, ei, NULL))
continue;
aggr = ospf_external_aggr_match(ospf, &ei->p);
/* If matching aggregator found, Add
* the external route reference to the
* aggregator and originate the aggr
* route if it is advertisable.
* flush the external LSA if it is
* already originated for this external
* prefix.
*/
if (aggr) {
ospf_originate_summary_lsa(ospf, aggr,
ei);
/* All aggregated external rts
* are handled here.
*/
ospf_handle_aggregated_exnl_rt(
ospf, aggr, ei);
continue;
}
/* External routes which are only out
* of aggregation will be handled here.
*/
ospf_handle_exnl_rt_after_aggr_del(ospf, ei);
}
}
}
}
static void
ospf_aggr_handle_advertise_change(struct ospf *ospf,
struct ospf_external_aggr_rt *aggr,
struct external_info *ei_aggr)
{
struct ospf_lsa *lsa;
/* Check if advertise option modified. */
if (CHECK_FLAG(aggr->flags, OSPF_EXTERNAL_AGGRT_NO_ADVERTISE)) {
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug(
"%s: Don't originate the summary address,It is configured to not-advertise.",
__func__);
if (CHECK_FLAG(aggr->flags, OSPF_EXTERNAL_AGGRT_ORIGINATED)) {
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug(
"%s: No-advertise,So Flush the Aggregate route(%pI4/%d)",
__func__, &aggr->p.prefix,
aggr->p.prefixlen);
ospf_external_lsa_flush(ospf, 0, &aggr->p, 0);
UNSET_FLAG(aggr->flags, OSPF_EXTERNAL_AGGRT_ORIGINATED);
}
return;
}
if (!CHECK_FLAG(aggr->flags, OSPF_EXTERNAL_AGGRT_ORIGINATED)) {
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug("%s: Now it is advatisable", __func__);
lsa = ospf_external_info_find_lsa(ospf, &ei_aggr->p);
if (lsa && IS_LSA_MAXAGE(lsa)) {
/* This is special case.
* If a summary route need to be originated but where
* summary route already exist in lsdb with maxage, then
* it need to be refreshed.
*/
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug(
"%s: It is already with Maxage, So refresh it (%pI4/%d)",
__func__, &aggr->p.prefix,
aggr->p.prefixlen);
ospf_external_lsa_refresh(ospf, lsa, ei_aggr,
LSA_REFRESH_FORCE, 1);
SET_FLAG(aggr->flags, OSPF_EXTERNAL_AGGRT_ORIGINATED);
} else {
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug(
"%s: Originate Aggregate LSA (%pI4/%d)",
__func__, &aggr->p.prefix,
aggr->p.prefixlen);
/* Originate summary LSA */
lsa = ospf_external_lsa_originate(ospf, ei_aggr);
if (lsa)
SET_FLAG(aggr->flags,
OSPF_EXTERNAL_AGGRT_ORIGINATED);
}
}
}
static void ospf_handle_external_aggr_update(struct ospf *ospf)
{
struct route_node *rn = NULL;
if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
zlog_debug("%s: Process modified aggregators.", __func__);
for (rn = route_top(ospf->rt_aggr_tbl); rn; rn = route_next(rn)) {
struct ospf_external_aggr_rt *aggr;
struct ospf_lsa *lsa = NULL;
struct as_external_lsa *asel = NULL;
struct external_info ei_aggr;
route_tag_t tag = 0;
if (!rn->info)
continue;
aggr = rn->info;
if (aggr->action == OSPF_ROUTE_AGGR_DEL) {
aggr->action = OSPF_ROUTE_AGGR_NONE;
ospf_external_aggr_delete(ospf, rn);