/* 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);
}
void
ospf6_asbr_external_lsa_update (struct ospf6_route_req *request)
{
char buffer [MAXLSASIZE];
u_int16_t size;
struct ospf6_lsa_as_external *external;
char *p;
struct ospf6_route_req route;
char pbuf[BUFSIZ];
/* assert this is best path; if not, return */
ospf6_route_lookup (&route, &request->route.prefix, request->table);
if (memcmp (&route.path, &request->path, sizeof (route.path)))
return;
if (IS_OSPF6_DUMP_LSA)
zlog_info ("Update AS-External: ID: %lu",
(u_long) ntohl (request->path.origin.id));
/* prepare buffer */
memset (buffer, 0, sizeof (buffer));
size = sizeof (struct ospf6_lsa_as_external);
external = (struct ospf6_lsa_as_external *) buffer;
p = (char *) (external + 1);
if (route.path.metric_type == 2)
SET_FLAG (external->bits_metric, OSPF6_ASBR_BIT_E); /* type2 */
else
UNSET_FLAG (external->bits_metric, OSPF6_ASBR_BIT_E); /* type1 */
/* forwarding address */
if (! IN6_IS_ADDR_UNSPECIFIED (&route.nexthop.address))
SET_FLAG (external->bits_metric, OSPF6_ASBR_BIT_F);
else
UNSET_FLAG (external->bits_metric, OSPF6_ASBR_BIT_F);
/* external route tag */
UNSET_FLAG (external->bits_metric, OSPF6_ASBR_BIT_T);
/* set metric. note: related to E bit */
OSPF6_ASBR_METRIC_SET (external, route.path.cost);
/* prefixlen */
external->prefix.prefix_length = route.route.prefix.prefixlen;
/* PrefixOptions */
external->prefix.prefix_options = route.path.prefix_options;
/* don't use refer LS-type */
external->prefix.prefix_refer_lstype = htons (0);
if (IS_OSPF6_DUMP_LSA)
{
prefix2str (&route.route.prefix, pbuf, sizeof (pbuf));
zlog_info (" Prefix: %s", pbuf);
}
/* set Prefix */
memcpy (p, &route.route.prefix.u.prefix6,
OSPF6_PREFIX_SPACE (route.route.prefix.prefixlen));
ospf6_prefix_apply_mask (&external->prefix);
size += OSPF6_PREFIX_SPACE (route.route.prefix.prefixlen);
p += OSPF6_PREFIX_SPACE (route.route.prefix.prefixlen);
/* Forwarding address */
if (CHECK_FLAG (external->bits_metric, OSPF6_ASBR_BIT_F))
{
memcpy (p, &route.nexthop.address, sizeof (struct in6_addr));
size += sizeof (struct in6_addr);
p += sizeof (struct in6_addr);
}
/* External Route Tag */
if (CHECK_FLAG (external->bits_metric, OSPF6_ASBR_BIT_T))
{
/* xxx */
}
ospf6_lsa_originate (htons (OSPF6_LSA_TYPE_AS_EXTERNAL),
route.path.origin.id, ospf6->router_id,
(char *) external, size, ospf6);
return;
}