[bsc] Send the SCCP IT message in a given interval

Send the message every 60 seconds on every SCCP
connection. The 60 seconds were taken from a protocol
trace obtained on the network.

2 files changed, 21 insertions, 0 deletions

diff --git a/openbsc/include/openbsc/gsm_data.h b/openbsc/include/openbsc/gsm_data.h
index a8973ef73..8a49a5dc7 100644
--- a/openbsc/include/openbsc/gsm_data.h
+++ b/openbsc/include/openbsc/gsm_data.h
@@ -127,6 +127,9 @@ struct bss_sccp_connection_data {
         /* for assginment command */
         struct timer_list T10;
 
+	/* for SCCP ... */
+	struct timer_list sccp_it;
+
 	/* audio handling */
 	int rtp_port;
 
diff --git a/openbsc/src/bsc_msc_ip.c b/openbsc/src/bsc_msc_ip.c
index 97dc42de0..9bce39aad 100644
--- a/openbsc/src/bsc_msc_ip.c
+++ b/openbsc/src/bsc_msc_ip.c
@@ -47,6 +47,9 @@
 
 #include <sccp/sccp.h>
 
+/* SCCP helper */
+#define SCCP_IT_TIMER 60
+
 /* MCC and MNC for the Location Area Identifier */
 struct gsm_network *bsc_gsmnet = 0;
 static const char *config_file = "openbsc.cfg";
@@ -76,11 +79,21 @@ struct bss_sccp_connection_data *bss_sccp_create_data()
 void bss_sccp_free_data(struct bss_sccp_connection_data *data)
 {
 	bsc_del_timer(&data->T10);
+	bsc_del_timer(&data->sccp_it);
 	bsc_free_queued(data->sccp);
 	bts_free_queued(data);
 	talloc_free(data);
 }
 
+static void sccp_it_fired(void *_data)
+{
+	struct bss_sccp_connection_data *data =
+		(struct bss_sccp_connection_data *) _data;
+
+	sccp_connection_send_it(data->sccp);
+	bsc_schedule_timer(&data->sccp_it, SCCP_IT_TIMER, 0);
+}
+
 
 /* GSM subscriber drop-ins */
 extern struct llist_head *subscr_bsc_active_subscriber(void);
@@ -201,6 +214,11 @@ int open_sccp_connection(struct msgb *layer3)
 	sccp_connection->data_ctx = con_data;
 	layer3->lchan->msc_data = con_data;
 
+	/* start the inactivity test timer */
+	con_data->sccp_it.cb = sccp_it_fired;
+	con_data->sccp_it.data = con_data;
+	bsc_schedule_timer(&con_data->sccp_it, SCCP_IT_TIMER, 0);
+
 	/* FIXME: Use transaction for this */
 	use_lchan(layer3->lchan);
 	sccp_connection_connect(sccp_connection, &sccp_ssn_bssap, data);