mncc: Include size and offsets of struct gsm_mncc in the hello

Increase the version number and send the sizeof of the gsm_mncc
and the gsm_data_frame structure. Include the offsets of some
members as well to maybe identify ABI problems.

The reason we go through this is that we want to benefit from
the native ABI and don't want to force packed structs.

1 files changed, 11 insertions, 1 deletions

diff --git a/openbsc/include/openbsc/mncc.h b/openbsc/include/openbsc/mncc.h
index 9153d6574..4a99bb11b 100644
--- a/openbsc/include/openbsc/mncc.h
+++ b/openbsc/include/openbsc/mncc.h
@@ -160,10 +160,20 @@ struct gsm_data_frame {
 	unsigned char	data[0];
 };
 
-#define MNCC_SOCK_VERSION	1
+#define MNCC_SOCK_VERSION	2
 struct gsm_mncc_hello {
 	uint32_t	msg_type;
 	uint32_t	version;
+
+	/* send the sizes of the structs */
+	uint32_t	mncc_size;
+	uint32_t	data_frame_size;
+
+	/* send some offsets */
+	uint32_t	called_offset;
+	uint32_t	signal_offset;
+	uint32_t	emergency_offset;
+	uint32_t	lchan_type_offset;
 };
 
 char *get_mncc_name(int value);