gsm0480: Implement a generic "invoke" wrapping for messages.

Implement a GSM 04.80 invoke wrapper for a component and an
invoke id.

Conflicts:

	openbsc/src/gsm_04_80.c

2 files changed, 23 insertions, 1 deletions

diff --git a/openbsc/include/openbsc/gsm_04_80.h b/openbsc/include/openbsc/gsm_04_80.h
index 2842d8d39..bfe7aaa81 100644
--- a/openbsc/include/openbsc/gsm_04_80.h
+++ b/openbsc/include/openbsc/gsm_04_80.h
@@ -20,5 +20,6 @@ int gsm0480_send_ussd_reject(const struct msgb *msg,
 				const struct ussd_request *request);
 
 struct msgb * gsm0480_create_notifySS(const char *text);
+int gsm0480_wrap_invoke(struct msgb *msg, int op, int link_id);
 
 #endif
diff --git a/openbsc/src/gsm_04_80.c b/openbsc/src/gsm_04_80.c
index 479998586..a314d40ec 100644
--- a/openbsc/src/gsm_04_80.c
+++ b/openbsc/src/gsm_04_80.c
@@ -360,8 +360,29 @@ int gsm0480_send_ussd_response(const struct msgb *in_msg, const char *response_t
 	return gsm48_sendmsg(msg, NULL);
 }
 
+/* wrap an invoke around it... the other way around
+ *
+ * 1.) Invoke Component tag
+ * 2.) Invoke ID Tag
+ * 3.) Operation
+ * 4.) Data
+ */
+int gsm0480_wrap_invoke(struct msgb *msg, int op, int link_id)
+{
+	/* 3. operation */
+	msgb_push_TLV1(msg, GSM0480_OPERATION_CODE, op);
+
+	/* 2. invoke id tag */
+	msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, link_id);
+
+	/* 1. component tag */
+	msgb_wrap_with_TL(msg, GSM0480_CTYPE_INVOKE);
+
+	return 0;
+}
+
 int gsm0480_send_ussd_reject(const struct msgb *in_msg,
-				const struct ussd_request *req)
+			     const struct ussd_request *req)
 {
 	struct msgb *msg = gsm48_msgb_alloc();
 	struct gsm48_hdr *gh;