From fc00c656c96528112d05cf0edf8631bd5eaea446 Mon Sep 17 00:00:00 2001
From: Kacper <kacper@mail.openlinux.dev>
Date: Sun, 7 Dec 2025 20:10:31 +0100
Subject: Add build system scaffolding and libc headers

---
 include/arch/x86_64/linux/erspan.h | 42 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 include/arch/x86_64/linux/erspan.h

(limited to 'include/arch/x86_64/linux/erspan.h')

diff --git a/include/arch/x86_64/linux/erspan.h b/include/arch/x86_64/linux/erspan.h
new file mode 100644
index 00000000..e97e6f74
--- /dev/null
+++ b/include/arch/x86_64/linux/erspan.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * ERSPAN Tunnel Metadata
+ *
+ * Copyright (c) 2018 VMware
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * Userspace API for metadata mode ERSPAN tunnel
+ */
+#ifndef _ERSPAN_H
+#define _ERSPAN_H
+
+#include <linux/types.h> /* For __beXX in userspace */
+#include <asm/byteorder.h>
+
+/* ERSPAN version 2 metadata header */
+struct erspan_md2 {
+	__be32 timestamp;
+	__be16 sgt; /* security group tag */
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+	__u8 hwid_upper : 2, ft : 5, p : 1;
+	__u8 o : 1, gra : 2, dir : 1, hwid : 4;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+	__u8 p : 1, ft : 5, hwid_upper : 2;
+	__u8 hwid : 4, dir : 1, gra : 2, o : 1;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+};
+
+struct erspan_metadata {
+	int version;
+	union {
+		__be32 index;	       /* Version 1 (type II)*/
+		struct erspan_md2 md2; /* Version 2 (type III) */
+	} u;
+};
+
+#endif /* _ERSPAN_H */
-- 
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