/*
* OSPF ABR functions.
* Copyright (C) 1999, 2000 Alex Zinin, 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 "plist.h"
#include "log.h"
#include "ospfd/ospfd.h"
#include "ospfd/ospf_interface.h"
#include "ospfd/ospf_ism.h"
#include "ospfd/ospf_asbr.h"
#include "ospfd/ospf_lsa.h"
#include "ospfd/ospf_lsdb.h"
#include "ospfd/ospf_neighbor.h"
#include "ospfd/ospf_nsm.h"
#include "ospfd/ospf_spf.h"
#include "ospfd/ospf_route.h"
#include "ospfd/ospf_ia.h"
#include "ospfd/ospf_flood.h"
#include "ospfd/ospf_abr.h"
#include "ospfd/ospf_ase.h"
#include "ospfd/ospf_zebra.h"
#include "ospfd/ospf_dump.h"
#include "ospfd/ospf_errors.h"
static struct ospf_area_range *ospf_area_range_new(struct prefix_ipv4 *p)
{
struct ospf_area_range *range;
range = XCALLOC(MTYPE_OSPF_AREA_RANGE, sizeof(struct ospf_area_range));
range->addr = p->prefix;
range->masklen = p->prefixlen;
range->cost_config = OSPF_AREA_RANGE_COST_UNSPEC;
return range;
}
static void ospf_area_range_free(struct ospf_area_range *range)
{
XFREE(MTYPE_OSPF_AREA_RANGE, range);
}
static void ospf_area_range_add(struct ospf_area *area,
struct ospf_area_range *range)
{
struct route_node *rn;
struct prefix_ipv4 p;
p.family = AF_INET;
p.prefixlen = range->masklen;
p.prefix = range->addr;
apply_mask_ipv4(&p);
rn = route_node_get(area->ranges, (struct prefix *)&p);
if (rn->info)
route_unlock_node(rn);
else
rn->info = range;
}
static void ospf_area_range_delete(struct ospf_area *area,
struct route_node *rn)
{
struct ospf_area_range *range = rn->info;
if (range->specifics != 0)
ospf_delete_discard_route(area->ospf, area->ospf->new_table,
(struct prefix_ipv4 *)&rn->p);
ospf_area_range_free(range);
rn->info = NULL;
route_unlock_node(rn);
route_unlock_node(rn);
}
struct ospf_area_range *ospf_area_range_lookup(struct ospf_area *area,
struct prefix_ipv4 *p)
{
struct route_node *rn;
rn = route_node_lookup(area->ranges, (struct prefix *)p);
if (rn) {
route_unlock_node(rn);
return rn->info;
}
return NULL;
}
struct ospf_area_range *ospf_area_range_lookup_next(struct ospf_area *area,
struct in_addr *range_net,
int first)
{
struct route_node *rn;
struct prefix_ipv4 p;
struct ospf_area_range *find;
p.family = AF_INET;
p.prefixlen = IPV4_MAX_BITLEN;
p.prefix = *range_net;
apply_mask_ipv4(&p);
if (first)
rn = route_top(area->ranges);
else {
rn = route_node_get(area->ranges, (struct prefix *)&p);
rn = route_next(rn);
}
for (; rn; rn = route_next(rn))
if (rn->info)
break;
if (rn && rn->info) {
find = rn->info;
*range_net = rn->p.u.prefix4;
route_unlock_node(rn);
return find;
}
return NULL;
}
static struct ospf_area_range *ospf_area_range_match(struct ospf_area *area,
struct prefix_ipv4 *p)
{
struct route_node *node;
node = route_node_match(area->ranges, (struct prefix *)p);
if (node) {
route_unlock_node(node);
return node->info;
}
return NULL;
}
struct ospf_area_range *ospf_area_range_match_any(struct ospf *ospf,
struct prefix_ipv4 *p)
{
struct ospf_area_range *range;
struct ospf_area *area;
struct listnode *node;
for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area))
if ((range = ospf_area_range_match(area, p)))
return range;
return NULL;
}
int ospf_area_range_active(struct ospf_area_range *range)
{
return range->specifics;
}
static int ospf_area_actively_attached(struct ospf_area *area)
{
return area->act_ints;
}
int ospf_area_range_set(struct ospf *ospf, struct in_addr area_id,
struct prefix_ipv4 *p, int advertise)
{
struct ospf_area *area;
struct ospf_area_range *range;
area = ospf_area_get(ospf, area_id);
if (area == NULL)
return 0;
range = ospf_area_range_lookup(area, p);
if (range != NULL) {
if (!CHECK_FLAG(advertise, OSPF_AREA_RANGE_ADVERTISE))
range->cost_config = OSPF_AREA_RANGE_COST_UNSPEC;
if ((CHECK_FLAG(range->flags, OSPF_AREA_RANGE_ADVERTISE)
&& !CHECK_FLAG(advertise, OSPF_AREA_RANGE_ADVERTISE))
|| (!CHECK_FLAG(range->flags, OSPF_AREA_RANGE_ADVERTISE)
&& CHECK_FLAG(advertise, OSPF_AREA_RANGE_ADVERTISE)))
ospf_schedule_abr_task(ospf);
} else {
range = ospf_area_range_new(p);
ospf_area_range_add(area, range);
ospf_schedule_abr_task(ospf);
}
if (CHECK_FLAG(advertise, OSPF_AREA_RANGE_ADVERTISE))
SET_FLAG(range->flags, OSPF_AREA_RANGE_ADVERTISE);
else {
UNSET_FLAG(range->flags, OSPF_AREA_RANGE_ADVERTISE);
range->cost_config = OSPF_AREA_RANGE_COST_UNSPEC;
}
return 1;
}
int ospf_area_range_cost_set(struct ospf *ospf, struct in_addr area_id,
struct prefix_ipv4 *p, uint32_t cost)
{
struct ospf_area *area;
struct ospf_area_range *range;
area = ospf_area_get(ospf, area_id);
if (area == NULL)
return 0;
range = ospf_area_range_lookup(area, p);
if (range == NULL)
return 0;
if (range->cost_config != cost) {
range->cost_config = cost;
if (ospf_area_range_active(range))
ospf_schedule_abr_task(ospf);
}
return 1;
}
int ospf_area_range_unset(struct ospf *ospf, struct in_addr area_id,
struct prefix_ipv4 *p)
{
struct ospf_area *area;
struct route_node *rn;
area = ospf_area_lookup_by_area_id(ospf, area_id);
if (area == NULL)
return 0;
rn = route_node_lookup(area->ranges, (struct prefix *)p);
if (rn == NULL)
return 0;
if (ospf_area_range_active(rn->info))
ospf_schedule_abr_task(ospf);
ospf_area_range_delete(area, rn);
return 1;
}
int ospf_area_range_substitute_set(struct ospf *ospf, struct in_addr area_id,
struct prefix_ipv4 *p, struct prefix_ipv4 *s)
{
struct ospf_area *area;
struct ospf_area_range *range;
area = ospf_area_get(ospf, area_id);
range = ospf_area_range_lookup(area, p);
if (range != NULL) {
if (!CHECK_FLAG(range->flags, OSPF_AREA_RANGE_ADVERTISE)
|| !CHECK_FLAG(range->flags, OSPF_AREA_RANGE_SUBSTITUTE))
ospf_schedule_abr_task(ospf);
} else {
range = ospf_area_range_new(p);
ospf_area_range_add(area, range);
ospf_schedule_abr_task(ospf);
}
SET_FLAG(range->flags, OSPF_AREA_RANGE_ADVERTISE);
SET_FLAG(range->flags, OSPF_AREA_RANGE_SUBSTITUTE);
range->subst_addr = s->prefix;
range->subst_masklen = s->prefixlen;
return 1;
}
int ospf_area_range_substitute_unset(struct ospf *ospf, struct in_addr area_id,
struct prefix_ipv4 *p)
{
struct ospf_area *area;
struct ospf_area_range *range;
area = ospf_area_lookup_by_area_id(ospf, area_id);
if (area == NULL)
return 0;
range = ospf_area_range_lookup(area, p);
if (range == NULL)
return 0;
if (CHECK_FLAG(range->flags, OSPF_AREA_RANGE_SUBSTITUTE))
if (ospf_area_range_active(range))
ospf_schedule_abr_task(ospf);
UNSET_FLAG(range->flags, OSPF_AREA_RANGE_SUBSTITUTE);
range->subst_addr.s_addr = INADDR_ANY;
range->subst_masklen = 0;
return 1;
}
int ospf_act_bb_connection(struct ospf *ospf)
{
if (ospf->backbone == NULL)
return 0;
return ospf->backbone->full_nbrs;
}
/* Determine whether this router is elected translator or not for area */
static int ospf_abr_nssa_am_elected(struct ospf_area *area)
{
struct route_node *rn;
struct ospf_lsa *lsa;
struct router_lsa *rlsa;
struct in_addr *best = NULL;
LSDB_LOOP (ROUTER_LSDB(area), rn, lsa) {
/* sanity checks */
if (!lsa || (lsa->data->type != OSPF_ROUTER_LSA)
|| IS_LSA_SELF(lsa))
continue;
rlsa = (struct router_lsa *)lsa->data;
/* ignore non-ABR routers */
if (!IS_ROUTER_LSA_BORDER(rlsa))
continue;
/* Router has Nt flag - always translate */
if (IS_ROUTER_LSA_NT(rlsa)) {
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_nssa_am_elected: router %s asserts Nt",
inet_ntoa(lsa->data->id));
return 0;
}
if (best == NULL)
best = &lsa->data->id;
else if (IPV4_ADDR_CMP(&best->s_addr, &lsa->data->id.s_addr)
< 0)
best = &lsa->data->id;
}
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_nssa_am_elected: best electable ABR is: %s",
(best) ? inet_ntoa(*best) : "<none>");
if (best == NULL)
return 1;
if (IPV4_ADDR_CMP(&best->s_addr, &area->ospf->router_id.s_addr) < 0)
return 1;
else
return 0;
}
/* Check NSSA ABR status
* assumes there are nssa areas
*/
static void ospf_abr_nssa_check_status(struct ospf *ospf)
{
struct ospf_area *area;
struct listnode *lnode, *nnode;
for (ALL_LIST_ELEMENTS(ospf->areas, lnode, nnode, area)) {
uint8_t old_state = area->NSSATranslatorState;
if (area->external_routing != OSPF_AREA_NSSA)
continue;
if (IS_DEBUG_OSPF(nssa, NSSA))
zlog_debug(
"ospf_abr_nssa_check_status: checking area %s",
inet_ntoa(area->area_id));
if (!IS_OSPF_ABR(area->ospf)) {
if (IS_DEBUG_OSPF(nssa, NSSA))
zlog_debug(
"ospf_abr_nssa_check_status: not ABR");
area->NSSATranslatorState =
OSPF_NSSA_TRANSLATE_DISABLED;
} else {
switch (area->NSSATranslatorRole) {
case OSPF_NSSA_ROLE_NEVER:
/* We never Translate Type-7 LSA. */
/* TODO: check previous state and flush? */
if (IS_DEBUG_OSPF(nssa, NSSA))
zlog_debug(
"ospf_abr_nssa_check_status: never translate");
area->NSSATranslatorState =
OSPF_NSSA_TRANSLATE_DISABLED;
break;
case OSPF_NSSA_ROLE_ALWAYS:
/* We always translate if we are an ABR
* TODO: originate new LSAs if state change?
* or let the nssa abr task take care of it?
*/
if (IS_DEBUG_OSPF(nssa, NSSA))
zlog_debug(
"ospf_abr_nssa_check_status: translate always");
area->NSSATranslatorState =
OSPF_NSSA_TRANSLATE_ENABLED;
break;
case OSPF_NSSA_ROLE_CANDIDATE:
/* We are a candidate for Translation */
if (ospf_abr_nssa_am_elected(area) > 0) {
area->NSSATranslatorState =
OSPF_NSSA_TRANSLATE_ENABLED;
if (IS_DEBUG_OSPF(nssa, NSSA))
zlog_debug(
"ospf_abr_nssa_check_status: elected translator");
} else {
area->NSSATranslatorState =
OSPF_NSSA_TRANSLATE_DISABLED;
if (IS_DEBUG_OSPF(nssa, NSSA))
zlog_debug(
"ospf_abr_nssa_check_status: not elected");
}
break;
}
}
/* RFC3101, 3.1:
* All NSSA border routers must set the E-bit in the Type-1
* router-LSAs
* of their directly attached non-stub areas, even when they are
* not
* translating.
*/
if (old_state != area->NSSATranslatorState) {
if (old_state == OSPF_NSSA_TRANSLATE_DISABLED)
ospf_asbr_status_update(ospf,
++ospf->redistribute);
else if (area->NSSATranslatorState
== OSPF_NSSA_TRANSLATE_DISABLED)
ospf_asbr_status_update(ospf,
--ospf->redistribute);
}
}
}
/* Check area border router status. */
void ospf_check_abr_status(struct ospf *ospf)
{
struct ospf_area *area;
struct listnode *node, *nnode;
int bb_configured = 0;
int bb_act_attached = 0;
int areas_configured = 0;
int areas_act_attached = 0;
uint8_t new_flags = ospf->flags;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_check_abr_status(): Start");
for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) {
if (listcount(area->oiflist)) {
areas_configured++;
if (OSPF_IS_AREA_BACKBONE(area))
bb_configured = 1;
}
if (ospf_area_actively_attached(area)) {
areas_act_attached++;
if (OSPF_IS_AREA_BACKBONE(area))
bb_act_attached = 1;
}
}
if (IS_DEBUG_OSPF_EVENT) {
zlog_debug("ospf_check_abr_status(): looked through areas");
zlog_debug("ospf_check_abr_status(): bb_configured: %d",
bb_configured);
zlog_debug("ospf_check_abr_status(): bb_act_attached: %d",
bb_act_attached);
zlog_debug("ospf_check_abr_status(): areas_configured: %d",
areas_configured);
zlog_debug("ospf_check_abr_status(): areas_act_attached: %d",
areas_act_attached);
}
switch (ospf->abr_type) {
case OSPF_ABR_SHORTCUT:
case OSPF_ABR_STAND:
if (areas_act_attached > 1)
SET_FLAG(new_flags, OSPF_FLAG_ABR);
else
UNSET_FLAG(new_flags, OSPF_FLAG_ABR);
break;
case OSPF_ABR_IBM:
if ((areas_act_attached > 1) && bb_configured)
SET_FLAG(new_flags, OSPF_FLAG_ABR);
else
UNSET_FLAG(new_flags, OSPF_FLAG_ABR);
break;
case OSPF_ABR_CISCO:
if ((areas_configured > 1) && bb_act_attached)
SET_FLAG(new_flags, OSPF_FLAG_ABR);
else
UNSET_FLAG(new_flags, OSPF_FLAG_ABR);
break;
default:
break;
}
if (new_flags != ospf->flags) {
ospf_spf_calculate_schedule(ospf, SPF_FLAG_ABR_STATUS_CHANGE);
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_check_abr_status(): new router flags: %x",
new_flags);
ospf->flags = new_flags;
ospf_router_lsa_update(ospf);
}
}
static void ospf_abr_update_aggregate(struct ospf_area_range *range,
struct ospf_route * or,
struct ospf_area *area)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_update_aggregate(): Start");
if (CHECK_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED)
&& (range->cost != OSPF_STUB_MAX_METRIC_SUMMARY_COST)) {
range->cost = OSPF_STUB_MAX_METRIC_SUMMARY_COST;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_update_aggregate(): use summary max-metric 0x%08x",
range->cost);
} else if (range->cost_config != OSPF_AREA_RANGE_COST_UNSPEC) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_update_aggregate(): use configured cost %d",
range->cost_config);
range->cost = range->cost_config;
} else {
if (range->specifics == 0) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_update_aggregate(): use or->cost %d",
or->cost);
range->cost = or->cost; /* 1st time get 1st cost */
}
if (or->cost > range->cost) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_update_aggregate(): update to %d",
or->cost);
range->cost = or->cost;
}
}
range->specifics++;
}
static void set_metric(struct ospf_lsa *lsa, uint32_t metric)
{
struct summary_lsa *header;
uint8_t *mp;
metric = htonl(metric);
mp = (uint8_t *)&metric;
mp++;
header = (struct summary_lsa *)lsa->data;
memcpy(header->metric, mp, 3);
}
/* ospf_abr_translate_nssa */
static int ospf_abr_translate_nssa(struct ospf_area *area, struct ospf_lsa *lsa)
{
/* Incoming Type-7 or later aggregated Type-7
*
* LSA is skipped if P-bit is off.
* LSA is aggregated if within range.
*
* The Type-7 is translated, Installed/Approved as a Type-5 into
* global LSDB, then Flooded through AS
*
* Later, any Unapproved Translated Type-5's are flushed/discarded
*/
struct ospf_lsa *old = NULL, *new = NULL;
struct as_external_lsa *ext7;
struct prefix_ipv4 p;
if (!CHECK_FLAG(lsa->data->options, OSPF_OPTION_NP)) {
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_translate_nssa(): LSA Id %s, P-bit off, NO Translation",
inet_ntoa(lsa->data->id));
return 1;
}
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_translate_nssa(): LSA Id %s, TRANSLATING 7 to 5",
inet_ntoa(lsa->data->id));
ext7 = (struct as_external_lsa *)(lsa->data);
p.prefix = lsa->data->id;
p.prefixlen = ip_masklen(ext7->mask);
if (ext7->e[0].fwd_addr.s_addr == OSPF_DEFAULT_DESTINATION) {
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_translate_nssa(): LSA Id %s, Forward address is 0, NO Translation",
inet_ntoa(lsa->data->id));
return 1;
}
/* try find existing AS-External LSA for this prefix */
old = ospf_external_info_find_lsa(area->ospf, &p);
if (CHECK_FLAG(lsa->flags, OSPF_LSA_IN_MAXAGE)) {
/* if type-7 is removed, remove old translated type-5 lsa */
if (old) {
UNSET_FLAG(old->flags, OSPF_LSA_APPROVED);
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_translate_nssa(): remove old translated LSA id %s",
inet_ntoa(old->data->id));
}
/* if type-7 is removed and type-5 does not exist, do not
* originate */
return 1;
}
if (old && CHECK_FLAG(old->flags, OSPF_LSA_APPROVED)) {
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_translate_nssa(): found old translated LSA Id %s, refreshing",
inet_ntoa(old->data->id));
/* refresh */
new = ospf_translated_nssa_refresh(area->ospf, lsa, old);
if (!new) {
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_translate_nssa(): could not refresh translated LSA Id %s",
inet_ntoa(old->data->id));
}
} else {
/* no existing external route for this LSA Id
* originate translated LSA
*/
if (ospf_translated_nssa_originate(area->ospf, lsa) == NULL) {
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_translate_nssa(): Could not translate Type-7 for %s to Type-5",
inet_ntoa(lsa->data->id));
return 1;
}
}
/* Area where Aggregate testing will be inserted, just like summary
advertisements */
/* ospf_abr_check_nssa_range (p_arg, lsa-> cost, lsa -> area); */
return 0;
}
static void ospf_abr_translate_nssa_range(struct prefix_ipv4 *p, uint32_t cost)
{
/* The Type-7 is created from the aggregated prefix and forwarded
for lsa installation and flooding... to be added... */
}
void ospf_abr_announce_network_to_area(struct prefix_ipv4 *p, uint32_t cost,
struct ospf_area *area)
{
struct ospf_lsa *lsa, *old = NULL;
struct summary_lsa *sl = NULL;
uint32_t full_cost;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_announce_network_to_area(): Start");
if (CHECK_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED))
full_cost = OSPF_STUB_MAX_METRIC_SUMMARY_COST;
else
full_cost = cost;
old = ospf_lsa_lookup_by_prefix(area->lsdb, OSPF_SUMMARY_LSA, p,
area->ospf->router_id);
if (old) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_network_to_area(): old summary found");
sl = (struct summary_lsa *)old->data;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_network_to_area(): old metric: %d, new metric: %d",
GET_METRIC(sl->metric), cost);
if ((GET_METRIC(sl->metric) == full_cost)
&& ((old->flags & OSPF_LSA_IN_MAXAGE) == 0)) {
/* unchanged. simply reapprove it */
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_network_to_area(): old summary approved");
SET_FLAG(old->flags, OSPF_LSA_APPROVED);
} else {
/* LSA is changed, refresh it */
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_network_to_area(): refreshing summary");
set_metric(old, full_cost);
lsa = ospf_lsa_refresh(area->ospf, old);
if (!lsa) {
char buf[PREFIX2STR_BUFFER];
prefix2str((struct prefix *)p, buf,
sizeof(buf));
flog_warn(EC_OSPF_LSA_MISSING,
"%s: Could not refresh %s to %s",
__func__, buf,
inet_ntoa(area->area_id));
return;
}
SET_FLAG(lsa->flags, OSPF_LSA_APPROVED);
/* This will flood through area. */
}
} else {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_network_to_area(): creating new summary");
lsa = ospf_summary_lsa_originate(p, full_cost, area);
/* This will flood through area. */
if (!lsa) {
char buf[PREFIX2STR_BUFFER];
prefix2str((struct prefix *)p, buf, sizeof(buf));
flog_warn(EC_OSPF_LSA_MISSING,
"%s: Could not originate %s to %s", __func__,
buf, inet_ntoa(area->area_id));
return;
}
SET_FLAG(lsa->flags, OSPF_LSA_APPROVED);
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_network_to_area(): flooding new version of summary");
}
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_announce_network_to_area(): Stop");
}
static int ospf_abr_nexthops_belong_to_area(struct ospf_route * or,
struct ospf_area *area)
{
struct listnode *node, *nnode;
struct ospf_path *path;
struct ospf_interface *oi;
for (ALL_LIST_ELEMENTS_RO(or->paths, node, path))
for (ALL_LIST_ELEMENTS_RO(area->oiflist, nnode, oi))
if (oi->ifp && oi->ifp->ifindex == path->ifindex)
return 1;
return 0;
}
static int ospf_abr_should_accept(struct prefix_ipv4 *p, struct ospf_area *area)
{
if (IMPORT_NAME(area)) {
if (IMPORT_LIST(area) == NULL)
IMPORT_LIST(area) =
access_list_lookup(AFI_IP, IMPORT_NAME(area));
if (IMPORT_LIST(area))
if (access_list_apply(IMPORT_LIST(area), p)
== FILTER_DENY)
return 0;
}
return 1;
}
static int ospf_abr_plist_in_check(struct ospf_area *area,
struct ospf_route * or,
struct prefix_ipv4 *p)
{
if (PREFIX_NAME_IN(area)) {
if (PREFIX_LIST_IN(area) == NULL)
PREFIX_LIST_IN(area) = prefix_list_lookup(
AFI_IP, PREFIX_NAME_IN(area));
if (PREFIX_LIST_IN(area))
if (prefix_list_apply(PREFIX_LIST_IN(area), p)
!= PREFIX_PERMIT)
return 0;
}
return 1;
}
static int ospf_abr_plist_out_check(struct ospf_area *area,
struct ospf_route * or,
struct prefix_ipv4 *p)
{
if (PREFIX_NAME_OUT(area)) {
if (PREFIX_LIST_OUT(area) == NULL)
PREFIX_LIST_OUT(area) = prefix_list_lookup(
AFI_IP, PREFIX_NAME_OUT(area));
if (PREFIX_LIST_OUT(area))
if (prefix_list_apply(PREFIX_LIST_OUT(area), p)
!= PREFIX_PERMIT)
return 0;
}
return 1;
}
static void ospf_abr_announce_network(struct ospf *ospf, struct prefix_ipv4 *p,
struct ospf_route * or)
{
struct ospf_area_range *range;
struct ospf_area *area, *or_area;
struct listnode *node;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_announce_network(): Start");
or_area = ospf_area_lookup_by_area_id(ospf, or->u.std.area_id);
assert(or_area);
for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_network(): looking at area %s",
inet_ntoa(area->area_id));
if (IPV4_ADDR_SAME(& or->u.std.area_id, &area->area_id))
continue;
if (ospf_abr_nexthops_belong_to_area(or, area))
continue;
if (!ospf_abr_should_accept(p, area)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_network(): prefix %s/%d was denied by import-list",
inet_ntoa(p->prefix), p->prefixlen);
continue;
}
if (!ospf_abr_plist_in_check(area, or, p)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_network(): prefix %s/%d was denied by prefix-list",
inet_ntoa(p->prefix), p->prefixlen);
continue;
}
if (area->external_routing != OSPF_AREA_DEFAULT
&& area->no_summary) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_network(): area %s is stub and no_summary",
inet_ntoa(area->area_id));
continue;
}
if (or->path_type == OSPF_PATH_INTER_AREA) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_network(): this is inter-area route to %s/%d",
inet_ntoa(p->prefix), p->prefixlen);
if (!OSPF_IS_AREA_BACKBONE(area))
ospf_abr_announce_network_to_area(p, or->cost,
area);
}
if (or->path_type == OSPF_PATH_INTRA_AREA) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_network(): this is intra-area route to %s/%d",
inet_ntoa(p->prefix), p->prefixlen);
if ((range = ospf_area_range_match(or_area, p))
&& !ospf_area_is_transit(area))
ospf_abr_update_aggregate(range, or, area);
else
ospf_abr_announce_network_to_area(p, or->cost,
area);
}
}
}
static int ospf_abr_should_announce(struct ospf *ospf, struct prefix_ipv4 *p,
struct ospf_route * or)
{
struct ospf_area *area;
area = ospf_area_lookup_by_area_id(ospf, or->u.std.area_id);
assert(area);
if (EXPORT_NAME(area)) {
if (EXPORT_LIST(area) == NULL)
EXPORT_LIST(area) =
access_list_lookup(AFI_IP, EXPORT_NAME(area));
if (EXPORT_LIST(area))
if (access_list_apply(EXPORT_LIST(area), p)
== FILTER_DENY)
return 0;
}
return 1;
}
static void ospf_abr_process_nssa_translates(struct ospf *ospf)
{
/* Scan through all NSSA_LSDB records for all areas;
If P-bit is on, translate all Type-7's to 5's and aggregate or
flood install as approved in Type-5 LSDB with XLATE Flag on
later, do same for all aggregates... At end, DISCARD all
remaining UNAPPROVED Type-5's (Aggregate is for future ) */
struct listnode *node;
struct ospf_area *area;
struct route_node *rn;
struct ospf_lsa *lsa;
if (IS_DEBUG_OSPF_NSSA)
zlog_debug("ospf_abr_process_nssa_translates(): Start");
for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
if (!area->NSSATranslatorState)
continue; /* skip if not translator */
if (area->external_routing != OSPF_AREA_NSSA)
continue; /* skip if not Nssa Area */
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_process_nssa_translates(): looking at area %s",
inet_ntoa(area->area_id));
LSDB_LOOP (NSSA_LSDB(area), rn, lsa)
ospf_abr_translate_nssa(area, lsa);
}
if (IS_DEBUG_OSPF_NSSA)
zlog_debug("ospf_abr_process_nssa_translates(): Stop");
}
static 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_debug("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_debug(
"ospf_abr_process_network_rt(): area %s no longer exists",
inet_ntoa(or->u.std.area_id));
continue;
}
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"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_debug(
"ospf_abr_process_network_rt(): this is an External router, skipping");
continue;
}
if (or->cost >= OSPF_LS_INFINITY) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"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_debug(
"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, (struct prefix_ipv4 *)&rn->p,
or)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"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,
(struct prefix_ipv4 *)&rn->p)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"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_debug(
"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_debug(
"ospf_abr_process_network_rt(): ALT ABR: No BB connection, skip not intra-area routes");
continue;
}
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_process_network_rt(): announcing");
ospf_abr_announce_network(ospf, (struct prefix_ipv4 *)&rn->p,
or);
}
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_process_network_rt(): Stop");
}
static void ospf_abr_announce_rtr_to_area(struct prefix_ipv4 *p, uint32_t cost,
struct ospf_area *area)
{
struct ospf_lsa *lsa, *old = NULL;
struct summary_lsa *slsa = NULL;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_announce_rtr_to_area(): Start");
old = ospf_lsa_lookup_by_prefix(area->lsdb, OSPF_ASBR_SUMMARY_LSA, p,
area->ospf->router_id);
if (old) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_rtr_to_area(): old summary found");
slsa = (struct summary_lsa *)old->data;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_network_to_area(): old metric: %d, new metric: %d",
GET_METRIC(slsa->metric), cost);
}
if (old && (GET_METRIC(slsa->metric) == cost)
&& ((old->flags & OSPF_LSA_IN_MAXAGE) == 0)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_rtr_to_area(): old summary approved");
SET_FLAG(old->flags, OSPF_LSA_APPROVED);
} else {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_announce_rtr_to_area(): 2.2");
if (old) {
set_metric(old, cost);
lsa = ospf_lsa_refresh(area->ospf, old);
} else
lsa = ospf_summary_asbr_lsa_originate(p, cost, area);
if (!lsa) {
char buf[PREFIX2STR_BUFFER];
prefix2str((struct prefix *)p, buf, sizeof(buf));
flog_warn(EC_OSPF_LSA_MISSING,
"%s: Could not refresh/originate %s to %s",
__func__, buf, inet_ntoa(area->area_id));
return;
}
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_rtr_to_area(): flooding new version of summary");
/*
zlog_info ("ospf_abr_announce_rtr_to_area(): creating new
summary");
lsa = ospf_summary_asbr_lsa (p, cost, area, old); */
SET_FLAG(lsa->flags, OSPF_LSA_APPROVED);
/* ospf_flood_through_area (area, NULL, lsa);*/
}
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_announce_rtr_to_area(): Stop");
}
static void ospf_abr_announce_rtr(struct ospf *ospf, struct prefix_ipv4 *p,
struct ospf_route * or)
{
struct listnode *node;
struct ospf_area *area;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_announce_rtr(): Start");
for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_rtr(): looking at area %s",
inet_ntoa(area->area_id));
if (IPV4_ADDR_SAME(& or->u.std.area_id, &area->area_id))
continue;
if (ospf_abr_nexthops_belong_to_area(or, area))
continue;
/* RFC3101: Do not generate ASBR type 4 LSA if NSSA ABR */
if (or->u.std.external_routing == OSPF_AREA_NSSA) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_rtr(): do not generate LSA Type-4 %s from NSSA",
inet_ntoa(p->prefix));
continue;
}
if (area->external_routing != OSPF_AREA_DEFAULT) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_rtr(): area %s doesn't support external routing",
inet_ntoa(area->area_id));
continue;
}
if (or->path_type == OSPF_PATH_INTER_AREA) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_rtr(): this is inter-area route to %s",
inet_ntoa(p->prefix));
if (!OSPF_IS_AREA_BACKBONE(area))
ospf_abr_announce_rtr_to_area(p, or->cost,
area);
}
if (or->path_type == OSPF_PATH_INTRA_AREA) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_rtr(): this is intra-area route to %s",
inet_ntoa(p->prefix));
ospf_abr_announce_rtr_to_area(p, or->cost, area);
}
}
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_announce_rtr(): Stop");
}
static 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_debug("ospf_abr_process_router_rt(): Start");
for (rn = route_top(rt); rn; rn = route_next(rn)) {
struct listnode *node, *nnode;
char flag = 0;
struct ospf_route *best = NULL;
if (rn->info == NULL)
continue;
l = rn->info;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_process_router_rt(): this is a route to %s",
inet_ntoa(rn->p.u.prefix4));
for (ALL_LIST_ELEMENTS(l, node, nnode, or)) {
if (!ospf_area_lookup_by_area_id(ospf,
or->u.std.area_id)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"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_debug(
"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_debug(
"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_debug(
"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_debug(
"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_debug(
"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_debug("ospf_abr_process_router_rt(): Stop");
}
static void
ospf_abr_unapprove_translates(struct ospf *ospf) /* For NSSA Translations */
{
struct ospf_lsa *lsa;
struct route_node *rn;
if (IS_DEBUG_OSPF_NSSA)
zlog_debug("ospf_abr_unapprove_translates(): Start");
/* NSSA Translator is not checked, because it may have gone away,
and we would want to flush any residuals anyway */
LSDB_LOOP (EXTERNAL_LSDB(ospf), rn, lsa)
if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)) {
UNSET_FLAG(lsa->flags, OSPF_LSA_APPROVED);
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_unapprove_translates(): approved unset on link id %s",
inet_ntoa(lsa->data->id));
}
if (IS_DEBUG_OSPF_NSSA)
zlog_debug("ospf_abr_unapprove_translates(): Stop");
}
static void ospf_abr_unapprove_summaries(struct ospf *ospf)
{
struct listnode *node;
struct ospf_area *area;
struct route_node *rn;
struct ospf_lsa *lsa;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_unapprove_summaries(): Start");
for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_unapprove_summaries(): considering area %s",
inet_ntoa(area->area_id));
LSDB_LOOP (SUMMARY_LSDB(area), rn, lsa)
if (ospf_lsa_is_self_originated(ospf, lsa)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_unapprove_summaries(): approved unset on summary link id %s",
inet_ntoa(lsa->data->id));
UNSET_FLAG(lsa->flags, OSPF_LSA_APPROVED);
}
LSDB_LOOP (ASBR_SUMMARY_LSDB(area), rn, lsa)
if (ospf_lsa_is_self_originated(ospf, lsa)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_unapprove_summaries(): approved unset on asbr-summary link id %s",
inet_ntoa(lsa->data->id));
UNSET_FLAG(lsa->flags, OSPF_LSA_APPROVED);
}
}
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_unapprove_summaries(): Stop");
}
static void ospf_abr_prepare_aggregates(struct ospf *ospf)
{
struct listnode *node;
struct route_node *rn;
struct ospf_area_range *range;
struct ospf_area *area;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_prepare_aggregates(): Start");
for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
for (rn = route_top(area->ranges); rn; rn = route_next(rn))
if ((range = rn->info) != NULL) {
range->cost = 0;
range->specifics = 0;
}
}
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_prepare_aggregates(): Stop");
}
static void ospf_abr_announce_aggregates(struct ospf *ospf)
{
struct ospf_area *area, *ar;
struct ospf_area_range *range;
struct route_node *rn;
struct prefix p;
struct listnode *node, *n;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_announce_aggregates(): Start");
for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_aggregates(): looking at area %s",
inet_ntoa(area->area_id));
for (rn = route_top(area->ranges); rn; rn = route_next(rn))
if ((range = rn->info)) {
if (!CHECK_FLAG(range->flags,
OSPF_AREA_RANGE_ADVERTISE)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_aggregates(): discarding suppress-ranges");
continue;
}
p.family = AF_INET;
p.u.prefix4 = range->addr;
p.prefixlen = range->masklen;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_aggregates(): this is range: %s/%d",
inet_ntoa(p.u.prefix4),
p.prefixlen);
if (CHECK_FLAG(range->flags,
OSPF_AREA_RANGE_SUBSTITUTE)) {
p.family = AF_INET;
p.u.prefix4 = range->subst_addr;
p.prefixlen = range->subst_masklen;
}
if (range->specifics) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_aggregates(): active range");
for (ALL_LIST_ELEMENTS_RO(ospf->areas,
n, ar)) {
if (ar == area)
continue;
/* We do not check nexthops
here, because
intra-area routes can be
associated with
one area only */
/* backbone routes are not
summarized
when announced into transit
areas */
if (ospf_area_is_transit(ar)
&& OSPF_IS_AREA_BACKBONE(
area)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_aggregates(): Skipping announcement of BB aggregate into a transit area");
continue;
}
ospf_abr_announce_network_to_area(
(struct prefix_ipv4
*)&p,
range->cost, ar);
}
}
}
}
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_announce_aggregates(): Stop");
}
static void
ospf_abr_send_nssa_aggregates(struct ospf *ospf) /* temporarily turned off */
{
struct listnode *node; /*, n; */
struct ospf_area *area; /*, *ar; */
struct route_node *rn;
struct ospf_area_range *range;
struct prefix_ipv4 p;
if (IS_DEBUG_OSPF_NSSA)
zlog_debug("ospf_abr_send_nssa_aggregates(): Start");
for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
if (!area->NSSATranslatorState)
continue;
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_send_nssa_aggregates(): looking at area %s",
inet_ntoa(area->area_id));
for (rn = route_top(area->ranges); rn; rn = route_next(rn)) {
if (rn->info == NULL)
continue;
range = rn->info;
if (!CHECK_FLAG(range->flags,
OSPF_AREA_RANGE_ADVERTISE)) {
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_send_nssa_aggregates(): discarding suppress-ranges");
continue;
}
p.family = AF_INET;
p.prefix = range->addr;
p.prefixlen = range->masklen;
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_send_nssa_aggregates(): this is range: %s/%d",
inet_ntoa(p.prefix), p.prefixlen);
if (CHECK_FLAG(range->flags,
OSPF_AREA_RANGE_SUBSTITUTE)) {
p.family = AF_INET;
p.prefix = range->subst_addr;
p.prefixlen = range->subst_masklen;
}
if (range->specifics) {
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_send_nssa_aggregates(): active range");
/* Fetch LSA-Type-7 from aggregate prefix, and
* then
* translate, Install (as Type-5), Approve, and
* Flood
*/
ospf_abr_translate_nssa_range(&p, range->cost);
}
} /* all area ranges*/
} /* all areas */
if (IS_DEBUG_OSPF_NSSA)
zlog_debug("ospf_abr_send_nssa_aggregates(): Stop");
}
static void ospf_abr_announce_stub_defaults(struct ospf *ospf)
{
struct listnode *node;
struct ospf_area *area;
struct prefix_ipv4 p;
if (!IS_OSPF_ABR(ospf))
return;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_announce_stub_defaults(): Start");
p.family = AF_INET;
p.prefix.s_addr = OSPF_DEFAULT_DESTINATION;
p.prefixlen = 0;
for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_stub_defaults(): looking at area %s",
inet_ntoa(area->area_id));
if ((area->external_routing != OSPF_AREA_STUB)
&& (area->external_routing != OSPF_AREA_NSSA))
continue;
if (OSPF_IS_AREA_BACKBONE(area))
continue; /* Sanity Check */
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_announce_stub_defaults(): announcing 0.0.0.0/0 to area %s",
inet_ntoa(area->area_id));
ospf_abr_announce_network_to_area(&p, area->default_cost, area);
}
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_announce_stub_defaults(): Stop");
}
static int ospf_abr_remove_unapproved_translates_apply(struct ospf *ospf,
struct ospf_lsa *lsa)
{
if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)
&& !CHECK_FLAG(lsa->flags, OSPF_LSA_APPROVED)) {
zlog_info(
"ospf_abr_remove_unapproved_translates(): removing unapproved translates, ID: %s",
inet_ntoa(lsa->data->id));
/* FLUSH THROUGHOUT AS */
ospf_lsa_flush_as(ospf, lsa);
/* DISCARD from LSDB */
}
return 0;
}
static void ospf_abr_remove_unapproved_translates(struct ospf *ospf)
{
struct route_node *rn;
struct ospf_lsa *lsa;
/* All AREA PROCESS should have APPROVED necessary LSAs */
/* Remove any left over and not APPROVED */
if (IS_DEBUG_OSPF_NSSA)
zlog_debug("ospf_abr_remove_unapproved_translates(): Start");
LSDB_LOOP (EXTERNAL_LSDB(ospf), rn, lsa)
ospf_abr_remove_unapproved_translates_apply(ospf, lsa);
if (IS_DEBUG_OSPF_NSSA)
zlog_debug("ospf_abr_remove_unapproved_translates(): Stop");
}
static void ospf_abr_remove_unapproved_summaries(struct ospf *ospf)
{
struct listnode *node;
struct ospf_area *area;
struct route_node *rn;
struct ospf_lsa *lsa;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_remove_unapproved_summaries(): Start");
for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_remove_unapproved_summaries(): looking at area %s",
inet_ntoa(area->area_id));
LSDB_LOOP (SUMMARY_LSDB(area), rn, lsa)
if (ospf_lsa_is_self_originated(ospf, lsa))
if (!CHECK_FLAG(lsa->flags, OSPF_LSA_APPROVED))
ospf_lsa_flush_area(lsa, area);
LSDB_LOOP (ASBR_SUMMARY_LSDB(area), rn, lsa)
if (ospf_lsa_is_self_originated(ospf, lsa))
if (!CHECK_FLAG(lsa->flags, OSPF_LSA_APPROVED))
ospf_lsa_flush_area(lsa, area);
}
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_remove_unapproved_summaries(): Stop");
}
static void ospf_abr_manage_discard_routes(struct ospf *ospf)
{
struct listnode *node, *nnode;
struct route_node *rn;
struct ospf_area *area;
struct ospf_area_range *range;
for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area))
for (rn = route_top(area->ranges); rn; rn = route_next(rn))
if ((range = rn->info) != NULL)
if (CHECK_FLAG(range->flags,
OSPF_AREA_RANGE_ADVERTISE)) {
if (range->specifics)
ospf_add_discard_route(
ospf, ospf->new_table,
area,
(struct prefix_ipv4
*)&rn->p);
else
ospf_delete_discard_route(
ospf, ospf->new_table,
(struct prefix_ipv4
*)&rn->p);
}
}
/* This is the function taking care about ABR NSSA, i.e. NSSA
Translator, -LSA aggregation and flooding. For all NSSAs
Any SELF-AS-LSA is in the Type-5 LSDB and Type-7 LSDB. These LSA's
are refreshed from the Type-5 LSDB, installed into the Type-7 LSDB
with the P-bit set.
Any received Type-5s are legal for an ABR, else illegal for IR.
Received Type-7s are installed, by area, with incoming P-bit. They
are flooded; if the Elected NSSA Translator, then P-bit off.
Additionally, this ABR will place "translated type-7's" into the
Type-5 LSDB in order to keep track of APPROVAL or not.
It will scan through every area, looking for Type-7 LSAs with P-Bit
SET. The Type-7's are either AS-FLOODED & 5-INSTALLED or
AGGREGATED. Later, the AGGREGATED LSAs are AS-FLOODED &
5-INSTALLED.
5-INSTALLED is into the Type-5 LSDB; Any UNAPPROVED Type-5 LSAs
left over are FLUSHED and DISCARDED.
For External Calculations, any NSSA areas use the Type-7 AREA-LSDB,
any ABR-non-NSSA areas use the Type-5 GLOBAL-LSDB. */
static void ospf_abr_nssa_task(struct ospf *ospf) /* called only if any_nssa */
{
if (IS_DEBUG_OSPF_NSSA)
zlog_debug("Check for NSSA-ABR Tasks():");
if (!IS_OSPF_ABR(ospf))
return;
if (!ospf->anyNSSA)
return;
/* Each area must confirm TranslatorRole */
if (IS_DEBUG_OSPF_NSSA)
zlog_debug("ospf_abr_nssa_task(): Start");
/* For all Global Entries flagged "local-translate", unset APPROVED */
if (IS_DEBUG_OSPF_NSSA)
zlog_debug("ospf_abr_nssa_task(): unapprove translates");
ospf_abr_unapprove_translates(ospf);
/* RESET all Ranges in every Area, same as summaries */
if (IS_DEBUG_OSPF_NSSA)
zlog_debug("ospf_abr_nssa_task(): NSSA initialize aggregates");
ospf_abr_prepare_aggregates(ospf); /*TURNED OFF just for now */
/* For all NSSAs, Type-7s, translate to 5's, INSTALL/FLOOD, or
* Aggregate as Type-7
* Install or Approve in Type-5 Global LSDB
*/
if (IS_DEBUG_OSPF_NSSA)
zlog_debug("ospf_abr_nssa_task(): process translates");
ospf_abr_process_nssa_translates(ospf);
/* Translate/Send any "ranged" aggregates, and also 5-Install and
* Approve
* Scan Type-7's for aggregates, translate to Type-5's,
* Install/Flood/Approve
*/
if (IS_DEBUG_OSPF_NSSA)
zlog_debug("ospf_abr_nssa_task(): send NSSA aggregates");
ospf_abr_send_nssa_aggregates(ospf); /*TURNED OFF FOR NOW */
/* Send any NSSA defaults as Type-5
*if (IS_DEBUG_OSPF_NSSA)
* zlog_debug ("ospf_abr_nssa_task(): announce nssa defaults");
*ospf_abr_announce_nssa_defaults (ospf);
* havnt a clue what above is supposed to do.
*/
/* Flush any unapproved previous translates from Global Data Base */
if (IS_DEBUG_OSPF_NSSA)
zlog_debug(
"ospf_abr_nssa_task(): remove unapproved translates");
ospf_abr_remove_unapproved_translates(ospf);
ospf_abr_manage_discard_routes(ospf); /* same as normal...discard */
if (IS_DEBUG_OSPF_NSSA)
zlog_debug("ospf_abr_nssa_task(): Stop");
}
/* This is the function taking care about ABR stuff, i.e.
summary-LSA origination and flooding. */
void ospf_abr_task(struct ospf *ospf)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_task(): Start");
if (ospf->new_table == NULL || ospf->new_rtrs == NULL) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_abr_task(): Routing tables are not yet ready");
return;
}
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_task(): unapprove summaries");
ospf_abr_unapprove_summaries(ospf);
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_task(): prepare aggregates");
ospf_abr_prepare_aggregates(ospf);
if (IS_OSPF_ABR(ospf)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_task(): process network RT");
ospf_abr_process_network_rt(ospf, ospf->new_table);
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_task(): process router RT");
ospf_abr_process_router_rt(ospf, ospf->new_rtrs);
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_task(): announce aggregates");
ospf_abr_announce_aggregates(ospf);
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_task(): announce stub defaults");
ospf_abr_announce_stub_defaults(ospf);
}
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_task(): remove unapproved summaries");
ospf_abr_remove_unapproved_summaries(ospf);
ospf_abr_manage_discard_routes(ospf);
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_abr_task(): Stop");
}
static int ospf_abr_task_timer(struct thread *thread)
{
struct ospf *ospf = THREAD_ARG(thread);
ospf->t_abr_task = 0;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("Running ABR task on timer");
ospf_check_abr_status(ospf);
ospf_abr_nssa_check_status(ospf);
ospf_abr_task(ospf);
ospf_abr_nssa_task(ospf); /* if nssa-abr, then scan Type-7 LSDB */
ospf_asbr_nssa_redist_task(ospf);
return 0;
}
void ospf_schedule_abr_task(struct ospf *ospf)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("Scheduling ABR task");
thread_add_timer(master, ospf_abr_task_timer, ospf, OSPF_ABR_TASK_DELAY,
&ospf->t_abr_task);
}