osmo-bsc: only clear connections of a specific MSC

The BSC clears all connections on reception of a
BSSAP RESET, however, the RESET command must not
affect the connections of other MSCs.

Ensure that only the connections of the MSC who
actually sent the BSSAP RESET are cleared.

Change-Id: I68fe2eadeae8ba6b6728fced42f6308e9b2d997a

1 files changed, 17 insertions, 4 deletions

diff --git a/src/osmo-bsc/osmo_bsc_sigtran.c b/src/osmo-bsc/osmo_bsc_sigtran.c
index 451329271..3ff26d0a2 100644
--- a/src/osmo-bsc/osmo_bsc_sigtran.c
+++ b/src/osmo-bsc/osmo_bsc_sigtran.c
@@ -373,10 +373,23 @@ void osmo_bsc_sigtran_reset(struct bsc_msc_data *msc)
 
 	/* Close all open connections */
 	llist_for_each_entry_safe(conn, conn_temp, &active_connections, entry) {
-		if (conn->conn)
-			gsm0808_clear(conn->conn);
-		bsc_notify_msc_lost(conn);
-		osmo_bsc_sigtran_del_conn(conn);
+
+		/* We only may close connections which actually belong to this
+		 * MSC. All other open connections are left untouched */
+		if (conn->msc == msc) {
+			/* Notify active connection users via USSD that the MSC is down */
+			bsc_notify_msc_lost(conn);
+
+			/* Take down all occopied RF channels */
+			if (conn->conn)
+				gsm0808_clear(conn->conn);
+
+			/* Disconnect all Sigtran connections */
+			osmo_sccp_tx_disconn(msc->a.sccp_user, conn->conn_id, &msc->a.g_calling_addr, 0);
+
+			/* Delete subscriber connection */
+			osmo_bsc_sigtran_del_conn(conn);
+		}
 	}
 }