libmsc: Track and update the location update expiry

Set the subscriber expiry timeout to twice the duration of the location
update period and provide functions subscr_expire() and
db_subscriber_expire() to mark subscribers offline that have missed two
location update periods.

This patch increases the DB revision to 3, so the hlr will be
incompatible with prior versions.

We should allow 0 for T3212 as well to disable the location update
period. In that case we will need a way to indicate that in the
database.

1 files changed, 1 insertions, 0 deletions

diff --git a/openbsc/include/openbsc/db.h b/openbsc/include/openbsc/db.h
index d0c85ea30..25c2aea70 100644
--- a/openbsc/include/openbsc/db.h
+++ b/openbsc/include/openbsc/db.h
@@ -41,6 +41,7 @@ struct gsm_subscriber *db_get_subscriber(struct gsm_network *net,
 					 enum gsm_subscriber_field field,
 					 const char *subscr);
 int db_sync_subscriber(struct gsm_subscriber *subscriber);
+int db_subscriber_expire(void *priv, void (*callback)(void *priv, long long unsigned int id));
 int db_subscriber_alloc_tmsi(struct gsm_subscriber *subscriber);
 int db_subscriber_alloc_exten(struct gsm_subscriber *subscriber);
 int db_subscriber_alloc_token(struct gsm_subscriber *subscriber, uint32_t* token);