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ospf6_abr.c
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/*
* Area Border Router function.
* Copyright (C) 2004 Yasuhiro Ohara
*
* 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 "log.h"
#include "prefix.h"
#include "table.h"
#include "vty.h"
#include "linklist.h"
#include "command.h"
#include "thread.h"
#include "plist.h"
#include "filter.h"
#include "ospf6_proto.h"
#include "ospf6_route.h"
#include "ospf6_lsa.h"
#include "ospf6_route.h"
#include "ospf6_lsdb.h"
#include "ospf6_message.h"
#include "ospf6_zebra.h"
#include "ospf6_top.h"
#include "ospf6_area.h"
#include "ospf6_interface.h"
#include "ospf6_neighbor.h"
#include "ospf6_flood.h"
#include "ospf6_intra.h"
#include "ospf6_abr.h"
#include "ospf6d.h"
unsigned char conf_debug_ospf6_abr;
int ospf6_is_router_abr(struct ospf6 *o)
{
struct listnode *node;
struct ospf6_area *oa;
int area_count = 0;
for (ALL_LIST_ELEMENTS_RO(o->area_list, node, oa))
if (IS_AREA_ENABLED(oa))
area_count++;
if (area_count > 1)
return 1;
return 0;
}
static int ospf6_abr_nexthops_belong_to_area(struct ospf6_route *route,
struct ospf6_area *area)
{
struct ospf6_interface *oi;
oi = ospf6_interface_lookup_by_ifindex(
ospf6_route_get_first_nh_index(route));
if (oi && oi->area && oi->area == area)
return 1;
else
return 0;
}
static void ospf6_abr_delete_route(struct ospf6_route *range,
struct ospf6_route *summary,
struct ospf6_route_table *summary_table,
struct ospf6_lsa *old)
{
if (summary) {
ospf6_route_remove(summary, summary_table);
}
if (old && !OSPF6_LSA_IS_MAXAGE(old))
ospf6_lsa_purge(old);
}
void ospf6_abr_enable_area(struct ospf6_area *area)
{
struct ospf6_area *oa;
struct listnode *node, *nnode;
for (ALL_LIST_ELEMENTS(area->ospf6->area_list, node, nnode, oa))
/* update B bit for each area */
OSPF6_ROUTER_LSA_SCHEDULE(oa);
}
void ospf6_abr_disable_area(struct ospf6_area *area)
{
struct ospf6_area *oa;
struct ospf6_route *ro, *nro;
struct ospf6_lsa *old;
struct listnode *node, *nnode;
/* Withdraw all summary prefixes previously originated */
for (ro = ospf6_route_head(area->summary_prefix); ro; ro = nro) {
nro = ospf6_route_next(ro);
old = ospf6_lsdb_lookup(ro->path.origin.type,
ro->path.origin.id,
area->ospf6->router_id, area->lsdb);
if (old)
ospf6_lsa_purge(old);
ospf6_route_remove(ro, area->summary_prefix);
}
/* Withdraw all summary router-routes previously originated */
for (ro = ospf6_route_head(area->summary_router); ro; ro = nro) {
nro = ospf6_route_next(ro);
old = ospf6_lsdb_lookup(ro->path.origin.type,
ro->path.origin.id,
area->ospf6->router_id, area->lsdb);
if (old)
ospf6_lsa_purge(old);
ospf6_route_remove(ro, area->summary_router);
}
/* Schedule Router-LSA for each area (ABR status may change) */
for (ALL_LIST_ELEMENTS(area->ospf6->area_list, node, nnode, oa))
/* update B bit for each area */
OSPF6_ROUTER_LSA_SCHEDULE(oa);
}
/* RFC 2328 12.4.3. Summary-LSAs */
/* Returns 1 if a summary LSA has been generated for the area */
/* This is used by the area/range logic to add/remove blackhole routes */
int ospf6_abr_originate_summary_to_area(struct ospf6_route *route,
struct ospf6_area *area)
{
struct ospf6_lsa *lsa, *old = NULL;
struct ospf6_route *summary, *range = NULL;
struct ospf6_area *route_area;
char buffer[OSPF6_MAX_LSASIZE];
struct ospf6_lsa_header *lsa_header;
caddr_t p;
struct ospf6_inter_prefix_lsa *prefix_lsa;
struct ospf6_inter_router_lsa *router_lsa;
struct ospf6_route_table *summary_table = NULL;
uint16_t type;
char buf[PREFIX2STR_BUFFER];
int is_debug = 0;
/* Only destination type network, range or ASBR are considered */
if (route->type != OSPF6_DEST_TYPE_NETWORK
&& route->type != OSPF6_DEST_TYPE_RANGE
&& ((route->type != OSPF6_DEST_TYPE_ROUTER)
|| !CHECK_FLAG(route->path.router_bits, OSPF6_ROUTER_BIT_E))) {
#if 0
zlog_debug(
"Route type is none of network, range nor ASBR, ignore");
#endif
return 0;
}
/* AS External routes are never considered */
if (route->path.type == OSPF6_PATH_TYPE_EXTERNAL1
|| route->path.type == OSPF6_PATH_TYPE_EXTERNAL2) {
#if 0
zlog_debug("Path type is external, skip");
#endif
return 0;
}
/* do not generate if the path's area is the same as target area */
if (route->path.area_id == area->area_id) {
#if 0
zlog_debug("The route is in the area itself, ignore");
#endif
return 0;
}
/* do not generate if the nexthops belongs to the target area */
if (ospf6_abr_nexthops_belong_to_area(route, area)) {
#if 0
zlog_debug("The route's nexthop is in the same area, ignore");
#endif
return 0;
}
if (route->type == OSPF6_DEST_TYPE_ROUTER) {
if (ADV_ROUTER_IN_PREFIX(&route->prefix)
== area->ospf6->router_id) {
inet_ntop(AF_INET,
&(ADV_ROUTER_IN_PREFIX(&route->prefix)), buf,
sizeof(buf));
zlog_debug(
"%s: Skipping ASBR announcement for ABR (%s)",
__func__, buf);
return 0;
}
}
if (route->type == OSPF6_DEST_TYPE_ROUTER) {
if (IS_OSPF6_DEBUG_ABR
|| IS_OSPF6_DEBUG_ORIGINATE(INTER_ROUTER)) {
is_debug++;
inet_ntop(AF_INET,
&(ADV_ROUTER_IN_PREFIX(&route->prefix)), buf,
sizeof(buf));
zlog_debug("Originating summary in area %s for ASBR %s",
area->name, buf);
}
summary_table = area->summary_router;
} else {
if (IS_OSPF6_DEBUG_ABR
|| IS_OSPF6_DEBUG_ORIGINATE(INTER_PREFIX))
is_debug++;
if (route->type == OSPF6_DEST_TYPE_NETWORK &&
route->path.origin.type ==
htons(OSPF6_LSTYPE_INTER_PREFIX)) {
if (!CHECK_FLAG(route->flag, OSPF6_ROUTE_BEST)) {
if (is_debug) {
inet_ntop(AF_INET,
&(ADV_ROUTER_IN_PREFIX(
&route->prefix)), buf,
sizeof(buf));
zlog_debug(
"%s: route %s with cost %u is not best, ignore.",
__func__, buf,
route->path.cost);
}
return 0;
}
}
if (route->path.origin.type ==
htons(OSPF6_LSTYPE_INTRA_PREFIX)) {
if (!CHECK_FLAG(route->flag, OSPF6_ROUTE_BEST)) {
if (is_debug) {
prefix2str(&route->prefix, buf,
sizeof(buf));
zlog_debug(
"%s: intra-prefix route %s with cost %u is not best, ignore.",
__func__, buf,
route->path.cost);
}
return 0;
}
}
if (is_debug) {
prefix2str(&route->prefix, buf, sizeof(buf));
zlog_debug("Originating summary in area %s for %s cost %u",
area->name, buf, route->path.cost);
}
summary_table = area->summary_prefix;
}
summary = ospf6_route_lookup(&route->prefix, summary_table);
if (summary)
old = ospf6_lsdb_lookup(summary->path.origin.type,
summary->path.origin.id,
area->ospf6->router_id, area->lsdb);
/* if this route has just removed, remove corresponding LSA */
if (CHECK_FLAG(route->flag, OSPF6_ROUTE_REMOVE)) {
if (is_debug)
zlog_debug(
"The route has just removed, purge previous LSA");
if (route->type == OSPF6_DEST_TYPE_RANGE) {
/* Whether the route have active longer prefix */
if (!CHECK_FLAG(route->flag,
OSPF6_ROUTE_ACTIVE_SUMMARY)) {
if (is_debug)
zlog_debug(
"The range is not active. withdraw");
ospf6_abr_delete_route(route, summary,
summary_table, old);
}
} else if (old) {
ospf6_route_remove(summary, summary_table);
ospf6_lsa_purge(old);
}
return 0;
}
if ((route->type == OSPF6_DEST_TYPE_ROUTER) && IS_AREA_STUB(area)) {
if (is_debug)
zlog_debug(
"Area has been stubbed, purge Inter-Router LSA");
ospf6_abr_delete_route(route, summary, summary_table, old);
return 0;
}
if (area->no_summary
&& (route->path.subtype != OSPF6_PATH_SUBTYPE_DEFAULT_RT)) {
if (is_debug)
zlog_debug("Area has been stubbed, purge prefix LSA");
ospf6_abr_delete_route(route, summary, summary_table, old);
return 0;
}
/* do not generate if the route cost is greater or equal to LSInfinity
*/
if (route->path.cost >= OSPF_LS_INFINITY) {
/* When we're clearing the range route because all active
* prefixes
* under the range are gone, we set the range's cost to
* OSPF_AREA_RANGE_COST_UNSPEC, which is > OSPF_LS_INFINITY. We
* don't want to trigger the code here for that. This code is
* for
* handling routes that have gone to infinity. The range removal
* happens
* elsewhere.
*/
if ((route->type != OSPF6_DEST_TYPE_RANGE)
&& (route->path.cost != OSPF_AREA_RANGE_COST_UNSPEC)) {
if (is_debug)
zlog_debug(
"The cost exceeds LSInfinity, withdraw");
if (old)
ospf6_lsa_purge(old);
return 0;
}
}
/* if this is a route to ASBR */
if (route->type == OSPF6_DEST_TYPE_ROUTER) {
/* Only the preferred best path is considered */
if (!CHECK_FLAG(route->flag, OSPF6_ROUTE_BEST)) {
if (is_debug)
zlog_debug(
"This is the secondary path to the ASBR, ignore");
ospf6_abr_delete_route(route, summary, summary_table,
old);
return 0;
}
/* Do not generate if the area is stub */
/* XXX */
}
/* if this is an intra-area route, this may be suppressed by aggregation
*/
if (route->type == OSPF6_DEST_TYPE_NETWORK
&& route->path.type == OSPF6_PATH_TYPE_INTRA) {
/* search for configured address range for the route's area */
route_area =
ospf6_area_lookup(route->path.area_id, area->ospf6);
assert(route_area);
range = ospf6_route_lookup_bestmatch(&route->prefix,
route_area->range_table);
/* ranges are ignored when originate backbone routes to transit
area.
Otherwise, if ranges are configured, the route is suppressed.
*/
if (range && !CHECK_FLAG(range->flag, OSPF6_ROUTE_REMOVE)
&& (route->path.area_id != OSPF_AREA_BACKBONE
|| !IS_AREA_TRANSIT(area))) {
if (is_debug) {
prefix2str(&range->prefix, buf, sizeof(buf));
zlog_debug("Suppressed by range %s of area %s",
buf, route_area->name);
}
ospf6_abr_delete_route(route, summary, summary_table,
old);
return 0;
}
}
/* If this is a configured address range */
if (route->type == OSPF6_DEST_TYPE_RANGE) {
/* If DoNotAdvertise is set */
if (CHECK_FLAG(route->flag, OSPF6_ROUTE_DO_NOT_ADVERTISE)) {
if (is_debug)
zlog_debug(
"This is the range with DoNotAdvertise set. ignore");
ospf6_abr_delete_route(route, summary, summary_table,
old);
return 0;
}
/* If there are no active prefixes in this range, remove */
if (!CHECK_FLAG(route->flag, OSPF6_ROUTE_ACTIVE_SUMMARY)) {
if (is_debug)
zlog_debug("The range is not active. withdraw");
ospf6_abr_delete_route(route, summary, summary_table,
old);
return 0;
}
}
/* Check export list */
if (EXPORT_NAME(area)) {
if (EXPORT_LIST(area) == NULL)
EXPORT_LIST(area) =
access_list_lookup(AFI_IP6, EXPORT_NAME(area));
if (EXPORT_LIST(area))
if (access_list_apply(EXPORT_LIST(area), &route->prefix)
== FILTER_DENY) {
if (is_debug) {
inet_ntop(AF_INET,
&(ADV_ROUTER_IN_PREFIX(
&route->prefix)),
buf, sizeof(buf));
zlog_debug(
"prefix %s was denied by export list",
buf);
}
return 0;
}
}
/* Check filter-list */
if (PREFIX_LIST_OUT(area))
if (prefix_list_apply(PREFIX_LIST_OUT(area), &route->prefix)
!= PREFIX_PERMIT) {
if (is_debug) {
inet_ntop(
AF_INET,
&(ADV_ROUTER_IN_PREFIX(&route->prefix)),
buf, sizeof(buf));
zlog_debug(
"prefix %s was denied by filter-list out",
buf);
}
return 0;
}
/* the route is going to be originated. store it in area's summary_table
*/
if (summary == NULL) {
summary = ospf6_route_copy(route);
summary->path.origin.adv_router = area->ospf6->router_id;
if (route->type == OSPF6_DEST_TYPE_ROUTER) {
summary->path.origin.type =
htons(OSPF6_LSTYPE_INTER_ROUTER);
summary->path.origin.id =
ADV_ROUTER_IN_PREFIX(&route->prefix);
} else {
summary->path.origin.type =
htons(OSPF6_LSTYPE_INTER_PREFIX);
summary->path.origin.id = ospf6_new_ls_id(
summary->path.origin.type,
summary->path.origin.adv_router, area->lsdb);
}
summary = ospf6_route_add(summary, summary_table);
} else {
summary->type = route->type;
monotime(&summary->changed);
}
summary->path.router_bits = route->path.router_bits;
summary->path.options[0] = route->path.options[0];
summary->path.options[1] = route->path.options[1];
summary->path.options[2] = route->path.options[2];
summary->path.prefix_options = route->path.prefix_options;
summary->path.area_id = area->area_id;
summary->path.type = OSPF6_PATH_TYPE_INTER;
summary->path.subtype = route->path.subtype;
summary->path.cost = route->path.cost;
/* summary->nexthop[0] = route->nexthop[0]; */
/* prepare buffer */
memset(buffer, 0, sizeof(buffer));
lsa_header = (struct ospf6_lsa_header *)buffer;
if (route->type == OSPF6_DEST_TYPE_ROUTER) {
router_lsa = (struct ospf6_inter_router_lsa
*)((caddr_t)lsa_header
+ sizeof(struct ospf6_lsa_header));
p = (caddr_t)router_lsa + sizeof(struct ospf6_inter_router_lsa);
/* Fill Inter-Area-Router-LSA */
router_lsa->options[0] = route->path.options[0];
router_lsa->options[1] = route->path.options[1];
router_lsa->options[2] = route->path.options[2];
OSPF6_ABR_SUMMARY_METRIC_SET(router_lsa, route->path.cost);
router_lsa->router_id = ADV_ROUTER_IN_PREFIX(&route->prefix);
type = htons(OSPF6_LSTYPE_INTER_ROUTER);
} else {
prefix_lsa = (struct ospf6_inter_prefix_lsa
*)((caddr_t)lsa_header
+ sizeof(struct ospf6_lsa_header));
p = (caddr_t)prefix_lsa + sizeof(struct ospf6_inter_prefix_lsa);
/* Fill Inter-Area-Prefix-LSA */
OSPF6_ABR_SUMMARY_METRIC_SET(prefix_lsa, route->path.cost);
prefix_lsa->prefix.prefix_length = route->prefix.prefixlen;
prefix_lsa->prefix.prefix_options = route->path.prefix_options;
/* set Prefix */
memcpy(p, &route->prefix.u.prefix6,
OSPF6_PREFIX_SPACE(route->prefix.prefixlen));
ospf6_prefix_apply_mask(&prefix_lsa->prefix);
p += OSPF6_PREFIX_SPACE(route->prefix.prefixlen);
type = htons(OSPF6_LSTYPE_INTER_PREFIX);
}
/* Fill LSA Header */
lsa_header->age = 0;
lsa_header->type = type;
lsa_header->id = summary->path.origin.id;
lsa_header->adv_router = area->ospf6->router_id;
lsa_header->seqnum =
ospf6_new_ls_seqnum(lsa_header->type, lsa_header->id,
lsa_header->adv_router, area->lsdb);
lsa_header->length = htons((caddr_t)p - (caddr_t)lsa_header);
/* LSA checksum */
ospf6_lsa_checksum(lsa_header);
/* create LSA */
lsa = ospf6_lsa_create(lsa_header);
/* Originate */
ospf6_lsa_originate_area(lsa, area);
return 1;
}
void ospf6_abr_range_reset_cost(struct ospf6 *ospf6)
{
struct listnode *node, *nnode;
struct ospf6_area *oa;
struct ospf6_route *range;
for (ALL_LIST_ELEMENTS(ospf6->area_list, node, nnode, oa))
for (range = ospf6_route_head(oa->range_table); range;
range = ospf6_route_next(range))
OSPF6_ABR_RANGE_CLEAR_COST(range);
}
static inline uint32_t ospf6_abr_range_compute_cost(struct ospf6_route *range,
struct ospf6 *o)
{
struct ospf6_route *ro;
uint32_t cost = 0;
for (ro = ospf6_route_match_head(&range->prefix, o->route_table); ro;
ro = ospf6_route_match_next(&range->prefix, ro)) {
if (ro->path.area_id == range->path.area_id
&& (ro->path.type == OSPF6_PATH_TYPE_INTRA)
&& !CHECK_FLAG(ro->flag, OSPF6_ROUTE_REMOVE))
cost = MAX(cost, ro->path.cost);
}
return cost;
}
static inline int
ospf6_abr_range_summary_needs_update(struct ospf6_route *range, uint32_t cost)
{
int redo_summary = 0;
if (CHECK_FLAG(range->flag, OSPF6_ROUTE_REMOVE)) {
UNSET_FLAG(range->flag, OSPF6_ROUTE_ACTIVE_SUMMARY);
redo_summary = 1;
} else if (CHECK_FLAG(range->flag, OSPF6_ROUTE_DO_NOT_ADVERTISE)) {
if (range->path.cost != 0) {
range->path.cost = 0;
redo_summary = 1;
}
} else if (cost) {
if ((OSPF6_PATH_COST_IS_CONFIGURED(range->path)
&& range->path.cost != range->path.u.cost_config)) {
range->path.cost = range->path.u.cost_config;
SET_FLAG(range->flag, OSPF6_ROUTE_ACTIVE_SUMMARY);
redo_summary = 1;
} else if (!OSPF6_PATH_COST_IS_CONFIGURED(range->path)
&& range->path.cost != cost) {
range->path.cost = cost;
SET_FLAG(range->flag, OSPF6_ROUTE_ACTIVE_SUMMARY);
redo_summary = 1;
}
} else if (CHECK_FLAG(range->flag, OSPF6_ROUTE_ACTIVE_SUMMARY)) {
/* Cost is zero, meaning no active range */
UNSET_FLAG(range->flag, OSPF6_ROUTE_ACTIVE_SUMMARY);
range->path.cost = OSPF_AREA_RANGE_COST_UNSPEC;
redo_summary = 1;
}
return (redo_summary);
}
static void ospf6_abr_range_update(struct ospf6_route *range)
{
uint32_t cost = 0;
struct listnode *node, *nnode;
struct ospf6_area *oa;
int summary_orig = 0;
assert(range->type == OSPF6_DEST_TYPE_RANGE);
/* update range's cost and active flag */
cost = ospf6_abr_range_compute_cost(range, ospf6);
/* Non-zero cost is a proxy for active longer prefixes in this range.
* If there are active routes covered by this range AND either the
* configured
* cost has changed or the summarized cost has changed then redo
* summaries.
* Alternately, if there are no longer active prefixes and there are
* summary announcements, withdraw those announcements.
*
* The don't advertise code relies on the path.cost being set to UNSPEC
* to
* work the first time. Subsequent times the path.cost is not 0 anyway
* if there
* were active ranges.
*/
if (ospf6_abr_range_summary_needs_update(range, cost)) {
for (ALL_LIST_ELEMENTS(ospf6->area_list, node, nnode, oa))
summary_orig +=
ospf6_abr_originate_summary_to_area(range, oa);
if (CHECK_FLAG(range->flag, OSPF6_ROUTE_ACTIVE_SUMMARY)
&& summary_orig) {
if (!CHECK_FLAG(range->flag,
OSPF6_ROUTE_BLACKHOLE_ADDED)) {
if (IS_OSPF6_DEBUG_ABR)
zlog_debug("Add discard route");
ospf6_zebra_add_discard(range);
}
} else {
/* Summary removed or no summary generated as no
* specifics exist */
if (CHECK_FLAG(range->flag,
OSPF6_ROUTE_BLACKHOLE_ADDED)) {
if (IS_OSPF6_DEBUG_ABR)
zlog_debug("Delete discard route");
ospf6_zebra_delete_discard(range);
}
}
}
}
void ospf6_abr_originate_summary(struct ospf6_route *route)
{
struct listnode *node, *nnode;
struct ospf6_area *oa;
struct ospf6_route *range = NULL;
if (route->type == OSPF6_DEST_TYPE_NETWORK) {
oa = ospf6_area_lookup(route->path.area_id, ospf6);
if (!oa) {
zlog_err("OSPFv6 area lookup failed");
return;
}
range = ospf6_route_lookup_bestmatch(&route->prefix,
oa->range_table);
if (range) {
ospf6_abr_range_update(range);
}
}
for (ALL_LIST_ELEMENTS(ospf6->area_list, node, nnode, oa))
ospf6_abr_originate_summary_to_area(route, oa);
}
void ospf6_abr_defaults_to_stub(struct ospf6 *o)
{
struct listnode *node, *nnode;
struct ospf6_area *oa;
struct ospf6_route *def, *route;
if (!o->backbone)
return;
def = ospf6_route_create();
def->type = OSPF6_DEST_TYPE_NETWORK;
def->prefix.family = AF_INET6;
def->prefix.prefixlen = 0;
memset(&def->prefix.u.prefix6, 0, sizeof(struct in6_addr));
def->type = OSPF6_DEST_TYPE_NETWORK;
def->path.type = OSPF6_PATH_TYPE_INTER;
def->path.subtype = OSPF6_PATH_SUBTYPE_DEFAULT_RT;
def->path.area_id = o->backbone->area_id;
for (ALL_LIST_ELEMENTS(ospf6->area_list, node, nnode, oa)) {
if (!IS_AREA_STUB(oa)) {
/* withdraw defaults when an area switches from stub to
* non-stub */
route = ospf6_route_lookup(&def->prefix,
oa->summary_prefix);
if (route
&& (route->path.subtype == def->path.subtype)) {
if (IS_OSPF6_DEBUG_ABR)
zlog_debug(
"Withdrawing default route from non-stubby area %s",
oa->name);
SET_FLAG(def->flag, OSPF6_ROUTE_REMOVE);
ospf6_abr_originate_summary_to_area(def, oa);
}
} else {
/* announce defaults to stubby areas */
if (IS_OSPF6_DEBUG_ABR)
zlog_debug(
"Announcing default route into stubby area %s",
oa->name);
UNSET_FLAG(def->flag, OSPF6_ROUTE_REMOVE);
ospf6_abr_originate_summary_to_area(def, oa);
}
}
ospf6_route_delete(def);
}
void ospf6_abr_old_path_update(struct ospf6_route *old_route,
struct ospf6_route *route,
struct ospf6_route_table *table)
{
struct ospf6_path *o_path = NULL;
struct listnode *anode, *anext;
struct listnode *nnode, *rnode, *rnext;
struct ospf6_nexthop *nh, *rnh;
for (ALL_LIST_ELEMENTS(old_route->paths, anode, anext, o_path)) {
if (o_path->area_id != route->path.area_id ||
(memcmp(&(o_path)->origin, &(route)->path.origin,
sizeof(struct ospf6_ls_origin)) != 0))
continue;
if ((o_path->cost == route->path.cost) &&
(o_path->u.cost_e2 == route->path.u.cost_e2))
continue;
for (ALL_LIST_ELEMENTS_RO(o_path->nh_list, nnode, nh)) {
for (ALL_LIST_ELEMENTS(old_route->nh_list, rnode,
rnext, rnh)) {
if (!ospf6_nexthop_is_same(rnh, nh))
continue;
listnode_delete(old_route->nh_list, rnh);
ospf6_nexthop_delete(rnh);
}
}
listnode_delete(old_route->paths, o_path);
ospf6_path_free(o_path);
for (ALL_LIST_ELEMENTS(old_route->paths, anode,
anext, o_path)) {
ospf6_merge_nexthops(old_route->nh_list,
o_path->nh_list);
}
if (IS_OSPF6_DEBUG_ABR || IS_OSPF6_DEBUG_EXAMIN(INTER_PREFIX))
zlog_debug("%s: paths %u nh %u", __func__,
old_route->paths
? listcount(old_route->paths)
: 0,
old_route->nh_list
? listcount(old_route->nh_list)
: 0);
if (table->hook_add)
(*table->hook_add)(old_route);
if (old_route->path.origin.id == route->path.origin.id &&
old_route->path.origin.adv_router ==
route->path.origin.adv_router) {
struct ospf6_path *h_path;
h_path = (struct ospf6_path *)
listgetdata(listhead(old_route->paths));
old_route->path.origin.type = h_path->origin.type;
old_route->path.origin.id = h_path->origin.id;
old_route->path.origin.adv_router =
h_path->origin.adv_router;
}
}
}
void ospf6_abr_old_route_remove(struct ospf6_lsa *lsa,
struct ospf6_route *old,
struct ospf6_route_table *table)
{
if (listcount(old->paths) > 1) {
struct listnode *anode, *anext, *nnode, *rnode, *rnext;
struct ospf6_path *o_path;
struct ospf6_nexthop *nh, *rnh;
bool nh_updated = false;
char buf[PREFIX2STR_BUFFER];
for (ALL_LIST_ELEMENTS(old->paths, anode, anext, o_path)) {
if (o_path->origin.adv_router != lsa->header->adv_router
&& o_path->origin.id != lsa->header->id)
continue;
for (ALL_LIST_ELEMENTS_RO(o_path->nh_list, nnode, nh)) {
for (ALL_LIST_ELEMENTS(old->nh_list,
rnode, rnext, rnh)) {
if (!ospf6_nexthop_is_same(rnh, nh))
continue;
listnode_delete(old->nh_list, rnh);
ospf6_nexthop_delete(rnh);
}
}
listnode_delete(old->paths, o_path);
ospf6_path_free(o_path);
nh_updated = true;
}
if (nh_updated) {
if (listcount(old->paths)) {
if (IS_OSPF6_DEBUG_ABR ||
IS_OSPF6_DEBUG_EXAMIN(INTER_PREFIX)) {
prefix2str(&old->prefix, buf,
sizeof(buf));
zlog_debug("%s: old %s updated nh %u",
__func__, buf,
old->nh_list ? listcount(
old->nh_list)
: 0);
}
if (table->hook_add)
(*table->hook_add)(old);
if ((old->path.origin.id == lsa->header->id) &&
(old->path.origin.adv_router
== lsa->header->adv_router)) {
struct ospf6_path *h_path;
h_path = (struct ospf6_path *)
listgetdata(
listhead(old->paths));
old->path.origin.type =
h_path->origin.type;
old->path.origin.id = h_path->origin.id;
old->path.origin.adv_router =
h_path->origin.adv_router;
}
} else
ospf6_route_remove(old, table);
}
} else
ospf6_route_remove(old, table);
}
/* RFC 2328 16.2. Calculating the inter-area routes */
void ospf6_abr_examin_summary(struct ospf6_lsa *lsa, struct ospf6_area *oa)
{
struct prefix prefix, abr_prefix;
struct ospf6_route_table *table = NULL;
struct ospf6_route *range, *route, *old = NULL, *old_route;
struct ospf6_route *abr_entry;
uint8_t type = 0;
char options[3] = {0, 0, 0};
uint8_t prefix_options = 0;
uint32_t cost = 0;
uint8_t router_bits = 0;
char buf[PREFIX2STR_BUFFER];
int is_debug = 0;
struct ospf6_inter_prefix_lsa *prefix_lsa = NULL;
struct ospf6_inter_router_lsa *router_lsa = NULL;
bool old_entry_updated = false;
struct ospf6_path *path, *o_path, *ecmp_path;
struct listnode *anode;
char adv_router[16];
memset(&prefix, 0, sizeof(prefix));
if (lsa->header->type == htons(OSPF6_LSTYPE_INTER_PREFIX)) {
if (IS_OSPF6_DEBUG_EXAMIN(INTER_PREFIX)) {
is_debug++;
zlog_debug("%s: Examin %s in area %s", __func__,
lsa->name, oa->name);
}
prefix_lsa =
(struct ospf6_inter_prefix_lsa *)OSPF6_LSA_HEADER_END(
lsa->header);
prefix.family = AF_INET6;
prefix.prefixlen = prefix_lsa->prefix.prefix_length;
ospf6_prefix_in6_addr(&prefix.u.prefix6, prefix_lsa,
&prefix_lsa->prefix);
if (is_debug)
prefix2str(&prefix, buf, sizeof(buf));
table = oa->ospf6->route_table;
type = OSPF6_DEST_TYPE_NETWORK;
prefix_options = prefix_lsa->prefix.prefix_options;
cost = OSPF6_ABR_SUMMARY_METRIC(prefix_lsa);
} else if (lsa->header->type == htons(OSPF6_LSTYPE_INTER_ROUTER)) {
if (IS_OSPF6_DEBUG_EXAMIN(INTER_ROUTER)) {
is_debug++;
zlog_debug("%s: Examin %s in area %s", __func__,
lsa->name, oa->name);
}
router_lsa =
(struct ospf6_inter_router_lsa *)OSPF6_LSA_HEADER_END(
lsa->header);
ospf6_linkstate_prefix(router_lsa->router_id, htonl(0),
&prefix);
if (is_debug)
inet_ntop(AF_INET, &router_lsa->router_id, buf,
sizeof(buf));
table = oa->ospf6->brouter_table;
type = OSPF6_DEST_TYPE_ROUTER;
options[0] = router_lsa->options[0];
options[1] = router_lsa->options[1];
options[2] = router_lsa->options[2];
cost = OSPF6_ABR_SUMMARY_METRIC(router_lsa);
SET_FLAG(router_bits, OSPF6_ROUTER_BIT_E);
} else
assert(0);
/* Find existing route */
route = ospf6_route_lookup(&prefix, table);
if (route)
ospf6_route_lock(route);
while (route && ospf6_route_is_prefix(&prefix, route)) {
if (route->path.area_id == oa->area_id
&& route->path.origin.type == lsa->header->type
&& !CHECK_FLAG(route->flag, OSPF6_ROUTE_WAS_REMOVED)) {
/* LSA adv. router could be part of route's
* paths list. Find the existing path and set
* old as the route.
*/
if (listcount(route->paths) > 1) {
for (ALL_LIST_ELEMENTS_RO(route->paths, anode,
o_path)) {
inet_ntop(AF_INET,
&o_path->origin.adv_router,
adv_router,
sizeof(adv_router));
if (o_path->origin.id == lsa->header->id
&& o_path->origin.adv_router ==
lsa->header->adv_router) {
old = route;
if (is_debug)
zlog_debug(
"%s: old entry found in paths, adv_router %s",
__func__,
adv_router);
break;
}
}
} else if (route->path.origin.id == lsa->header->id &&
route->path.origin.adv_router ==
lsa->header->adv_router)
old = route;
}
route = ospf6_route_next(route);
}
if (route)
ospf6_route_unlock(route);
/* (1) if cost == LSInfinity or if the LSA is MaxAge */
if (cost == OSPF_LS_INFINITY) {
if (is_debug)
zlog_debug("cost is LS_INFINITY, ignore");
if (old)
ospf6_abr_old_route_remove(lsa, old, table);
return;
}
if (OSPF6_LSA_IS_MAXAGE(lsa)) {
if (is_debug)
zlog_debug("%s: LSA %s is MaxAge, ignore", __func__,
lsa->name);
if (old)
ospf6_abr_old_route_remove(lsa, old, table);
return;
}
/* (2) if the LSA is self-originated, ignore */
if (lsa->header->adv_router == oa->ospf6->router_id) {
if (is_debug)
zlog_debug("LSA %s is self-originated, ignore",
lsa->name);
if (old)
ospf6_route_remove(old, table);
return;
}
/* (3) if the prefix is equal to an active configured address range */
/* or if the NU bit is set in the prefix */
if (lsa->header->type == htons(OSPF6_LSTYPE_INTER_PREFIX)) {