bsc/ussd: Optionally send USSD message on MSC disconnection
Send an USSD message on each MS connection if the connection to
the MSC has been lost.
Add a vty config command 'bsc-msc-loss-txt' in 'config-msc' to set
the notification string and to enable the feature.
Ticket: OW#957
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_sccp.c b/openbsc/src/osmo-bsc/osmo_bsc_sccp.c
index 3533d6d..ad554e8 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_sccp.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_sccp.c
@@ -262,13 +262,35 @@
return 0;
}
-static void bsc_close_connections(struct bsc_msc_connection *msc_con)
+static void bsc_notify_msc_lost(struct osmo_bsc_sccp_con *con)
+{
+ struct gsm_subscriber_connection *conn = con->conn;
+
+ /* send USSD notification if string configured and con->data is set */
+ if (!conn)
+ return;
+
+ /* check for config string */
+ if (!con->msc->ussd_msc_lost_txt)
+ return;
+ if (con->msc->ussd_msc_lost_txt[0] == '\0')
+ return;
+
+ /* send USSD notification */
+ gsm0480_send_ussdNotify(conn, 1, conn->sccp_con->msc->ussd_welcome_txt);
+ gsm0480_send_releaseComplete(conn);
+}
+
+static void bsc_notify_and_close_conns(struct bsc_msc_connection *msc_con)
{
struct osmo_bsc_sccp_con *con, *tmp;
llist_for_each_entry_safe(con, tmp, &active_connections, entry) {
- if (con->msc->msc_con == msc_con)
- bsc_sccp_force_free(con);
+ if (con->msc->msc_con != msc_con)
+ continue;
+
+ bsc_notify_msc_lost(con);
+ bsc_sccp_force_free(con);
}
}
@@ -282,7 +304,7 @@
msc = signal_data;
if (signal == S_MSC_LOST)
- bsc_close_connections(msc->data->msc_con);
+ bsc_notify_and_close_conns(msc->data->msc_con);
return 0;
}