tools, include: Grab a copy of linux/erspan.h

Bring the erspan uapi header file so BPF tunnel helpers can use it.

Fixes: 933a741e3b82 ("selftests/bpf: bpf tunnel test.")
Reported-by: Yonghong Song <yhs@fb.com>
Signed-off-by: William Tu <u9012063@gmail.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

diff --git a/tools/include/uapi/linux/erspan.h b/tools/include/uapi/linux/erspan.h
new file mode 100644 (file)
index 0000000..8415730
--- /dev/null
+++ b/tools/include/uapi/linux/erspan.h
@@ -0,0 +1,52 @@
+/* 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 _UAPI_ERSPAN_H
+#define _UAPI_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 /* _UAPI_ERSPAN_H */