uapi: add version magic

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/uapi.h b/src/uapi.h
index 9cf9b2c..130f30a 100644
--- a/src/uapi.h
+++ b/src/uapi.h
@@ -124,7 +124,13 @@ enum {
 	WGDEVICE_REMOVE_PRESHARED_KEY = (1 << 2),
 	WGDEVICE_REMOVE_FWMARK = (1 << 3)
 };
+
+enum {
+	WG_API_VERSION_MAGIC = 0xbeef0001
+};
+
 struct wgdevice {
+	__u32 version_magic; /* Must be value of WG_API_VERSION_MAGIC */
 	char interface[IFNAMSIZ]; /* Get */
 	__u32 flags; /* Set */