1 files changed, 31 insertions, 0 deletions
diff --git a/openbsc/include/openbsc/msc_ifaces.h b/openbsc/include/openbsc/msc_ifaces.h
new file mode 100644
index 000000000..ace6ea11d
--- /dev/null
+++ b/openbsc/include/openbsc/msc_ifaces.h
@@ -0,0 +1,31 @@
+#pragma once
+
+#include <osmocom/core/msgb.h>
+#include <openbsc/gsm_data.h>
+
+/* This callback structure allows linking specific components without having to
+ * include entire infrastructures of external libraries. For example, a unit
+ * test does not need to link against external ASN1 libraries if it is never
+ * going to encode actual outgoing messages. It is up to each building scope to
+ * plug meaningful sending/receiving callback functions, or to have mere dummy
+ * implementations. */
+struct msc_api {
+
+	struct {
+		/* libmsc calls this to send out messages to an A-interface */
+		int (*tx)(struct msgb *msg, uint8_t sapi);
+	} a;
+
+	struct {
+		/* libmsc calls this to send out messages to an Iu-interface */
+		int (*tx)(struct msgb *msg, uint8_t sapi);
+	} iu;
+};
+
+/* TODO does this belong to openbsc/gsm_04_08.h ?? */
+int msc_compl_l3(struct gsm_subscriber_connection *conn, struct msgb *msg,
+		 uint16_t chosen_channel);
+
+/* Depending on conn->via_iface (A or IuCS), submit msg to the proper link api. */
+extern int msc_submit_dtap(struct gsm_subscriber_connection *conn,
+			   struct msgb *msg);