/* AS External LSA origination */
static void
ospf6_as_external_lsa_originate (struct ospf6_route *route)
{
char buffer[OSPF6_MAX_LSASIZE];
struct ospf6_lsa_header *lsa_header;
struct ospf6_lsa *old, *lsa;
struct ospf6_external_info *info = route->route_option;
struct ospf6_as_external_lsa *as_external_lsa;
char buf[64];
caddr_t p;
/*restarter 不产生 lsa*/
if(ospf6->restart)
{
return ;
}
/* find previous LSA */
old = ospf6_lsdb_lookup (htons (OSPF6_LSTYPE_AS_EXTERNAL),
route->path.origin.id, ospf6->router_id,
ospf6->lsdb);
if (IS_OSPF6_DEBUG_ASBR || IS_OSPF6_DEBUG_ORIGINATE (AS_EXTERNAL))
{
prefix2str (&route->prefix, buf, sizeof (buf));
zlog_debug ("Originate AS-External-LSA for %s", buf);
}
/* prepare buffer */
memset (buffer, 0, sizeof (buffer));
lsa_header = (struct ospf6_lsa_header *) buffer;
as_external_lsa = (struct ospf6_as_external_lsa *)
((caddr_t) lsa_header + sizeof (struct ospf6_lsa_header));
p = (caddr_t)
((caddr_t) as_external_lsa + sizeof (struct ospf6_as_external_lsa));
/* Fill AS-External-LSA */
/* Metric type */
if (route->path.metric_type == 2)
SET_FLAG (as_external_lsa->bits_metric, OSPF6_ASBR_BIT_E);
else
UNSET_FLAG (as_external_lsa->bits_metric, OSPF6_ASBR_BIT_E);
/* forwarding address */
if (! IN6_IS_ADDR_UNSPECIFIED (&info->forwarding))
SET_FLAG (as_external_lsa->bits_metric, OSPF6_ASBR_BIT_F);
else
UNSET_FLAG (as_external_lsa->bits_metric, OSPF6_ASBR_BIT_F);
/* external route tag */
UNSET_FLAG (as_external_lsa->bits_metric, OSPF6_ASBR_BIT_T);
/* Set metric */
OSPF6_ASBR_METRIC_SET (as_external_lsa, route->path.cost);
/* prefixlen */
as_external_lsa->prefix.prefix_length = route->prefix.prefixlen;
/* PrefixOptions */
as_external_lsa->prefix.prefix_options = route->path.prefix_options;
/* don't use refer LS-type */
as_external_lsa->prefix.prefix_refer_lstype = htons (0);
/* set Prefix */
memcpy (p, &route->prefix.u.prefix6,
OSPF6_PREFIX_SPACE (route->prefix.prefixlen));
ospf6_prefix_apply_mask (&as_external_lsa->prefix);
p += OSPF6_PREFIX_SPACE (route->prefix.prefixlen);
/* Forwarding address */
if (CHECK_FLAG (as_external_lsa->bits_metric, OSPF6_ASBR_BIT_F))
{
memcpy (p, &info->forwarding, sizeof (struct in6_addr));
p += sizeof (struct in6_addr);
}
/* External Route Tag */
if (CHECK_FLAG (as_external_lsa->bits_metric, OSPF6_ASBR_BIT_T))
{
/* xxx */
}
/* Fill LSA Header */
lsa_header->age = 0;
lsa_header->type = htons (OSPF6_LSTYPE_AS_EXTERNAL);
lsa_header->id = route->path.origin.id;
lsa_header->adv_router = ospf6->router_id;
lsa_header->seqnum =
ospf6_new_ls_seqnum (lsa_header->type, lsa_header->id,
lsa_header->adv_router, ospf6->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_process (lsa, ospf6);
}
/* RFC 2328 12.4.3. Summary-LSAs */
void
ospf6_abr_originate_summary_to_area (struct ospf6_route *route,
struct ospf6_area *area)
{
struct ospf6_lsa *lsa, *old = NULL;
struct ospf6_interface *oi;
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;
u_int16_t type;
char buf[64];
int is_debug = 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++;
prefix2str (&route->prefix, buf, sizeof (buf));
zlog_debug ("Originating summary in area %s for %s",
area->name, buf);
}
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 (summary)
ospf6_route_remove (summary, summary_table);
if (old)
ospf6_lsa_purge (old);
return;
}
/* 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 (is_debug)
zlog_debug ("Route type is none of network, range nor ASBR, withdraw");
if (summary)
ospf6_route_remove (summary, summary_table);
if (old)
ospf6_lsa_purge (old);
return;
}
/* AS External routes are never considered */
if (route->path.type == OSPF6_PATH_TYPE_EXTERNAL1 ||
route->path.type == OSPF6_PATH_TYPE_EXTERNAL2)
{
if (is_debug)
zlog_debug ("Path type is external, withdraw");
if (summary)
ospf6_route_remove (summary, summary_table);
if (old)
ospf6_lsa_purge (old);
return;
}
/* do not generate if the path's area is the same as target area */
if (route->path.area_id == area->area_id)
{
if (is_debug)
zlog_debug ("The route is in the area itself, ignore");
if (summary)
ospf6_route_remove (summary, summary_table);
if (old)
ospf6_lsa_purge (old);
return;
}
/* do not generate if the nexthops belongs to the target area */
oi = ospf6_interface_lookup_by_ifindex (route->nexthop[0].ifindex);
if (oi && oi->area && oi->area == area)
{
if (is_debug)
zlog_debug ("The route's nexthop is in the same area, ignore");
if (summary)
ospf6_route_remove (summary, summary_table);
if (old)
ospf6_lsa_purge (old);
return;
}
/* do not generate if the route cost is greater or equal to LSInfinity */
if (route->path.cost >= OSPF_LS_INFINITY)
{
if (is_debug)
zlog_debug ("The cost exceeds LSInfinity, withdraw");
if (summary)
ospf6_route_remove (summary, summary_table);
if (old)
ospf6_lsa_purge (old);
return;
}
/* if this is a route to ASBR */
if (route->type == OSPF6_DEST_TYPE_ROUTER)
{
/* Only the prefered 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");
if (summary)
ospf6_route_remove (summary, summary_table);
if (old)
ospf6_lsa_purge (old);
return;
}
/* 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);
}
if (summary)
ospf6_route_remove (summary, summary_table);
if (old)
ospf6_lsa_purge (old);
return;
}
}
/* 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");
if (summary)
ospf6_route_remove (summary, summary_table);
if (old)
ospf6_lsa_purge (old);
return;
}
/* 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");
if (summary)
ospf6_route_remove (summary, summary_table);
if (old)
ospf6_lsa_purge (old);
return;
}
}
/* 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;
}
}
/* Check filter-list */
if (PREFIX_NAME_OUT (area))
{
if (PREFIX_LIST_OUT (area) == NULL)
PREFIX_LIST_OUT (area) =
prefix_list_lookup(AFI_IP6, PREFIX_NAME_OUT (area));
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;
}
}
/* the route is going to be originated. store it in area's summary_table */
if (summary == NULL)
{
summary = ospf6_route_copy (route);
if (route->type == OSPF6_DEST_TYPE_NETWORK ||
route->type == OSPF6_DEST_TYPE_RANGE)
summary->path.origin.type = htons (OSPF6_LSTYPE_INTER_PREFIX);
else
summary->path.origin.type = htons (OSPF6_LSTYPE_INTER_ROUTER);
summary->path.origin.adv_router = area->ospf6->router_id;
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;
quagga_gettime (QUAGGA_CLK_MONOTONIC, &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.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);
}