Labels for the Multiprotocol Label Switching are defined in RFC 3032
which was superseded by RFC 5462. Add the definition to UAPI and a stub
header for include/linux.
Signed-off-by: Simon Wunderlich <sw@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@xxxxxxxxxxxxxxxxxxx>
---
Changes to third version:
* rename mpls_label_stack to mpls_label, as it describes just one of
possibly multiple label stack entries (see RFC 3032).
Changes to first version:
* add stub mpls header in include/linux/mpls.h for users inside the
kernel
---
include/linux/mpls.h | 6 ++++++
include/uapi/linux/mpls.h | 34 ++++++++++++++++++++++++++++++++++
2 files changed, 40 insertions(+)
create mode 100644 include/linux/mpls.h
create mode 100644 include/uapi/linux/mpls.h
diff --git a/include/linux/mpls.h b/include/linux/mpls.h
new file mode 100644
index 0000000..9999145
--- /dev/null
+++ b/include/linux/mpls.h
@@ -0,0 +1,6 @@
+#ifndef _LINUX_MPLS_H
+#define _LINUX_MPLS_H
+
+#include <uapi/linux/mpls.h>
+
+#endif /* _LINUX_MPLS_H */
diff --git a/include/uapi/linux/mpls.h b/include/uapi/linux/mpls.h
new file mode 100644
index 0000000..bc9abfe
--- /dev/null
+++ b/include/uapi/linux/mpls.h
@@ -0,0 +1,34 @@
+#ifndef _UAPI_MPLS_H
+#define _UAPI_MPLS_H
+
+#include <linux/types.h>
+#include <asm/byteorder.h>
+
+/* Reference: RFC 5462, RFC 3032
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Label | TC |S| TTL |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * Label: Label Value, 20 bits
+ * TC: Traffic Class field, 3 bits
+ * S: Bottom of Stack, 1 bit
+ * TTL: Time to Live, 8 bits
+ */
+
+struct mpls_label {
+ __be32 entry;
+};
+
+#define MPLS_LS_LABEL_MASK 0xFFFFF000
+#define MPLS_LS_LABEL_SHIFT 12
+#define MPLS_LS_TC_MASK 0x00000E00
+#define MPLS_LS_TC_SHIFT 9
+#define MPLS_LS_S_MASK 0x00000100
+#define MPLS_LS_S_SHIFT 8
+#define MPLS_LS_TTL_MASK 0x000000FF
+#define MPLS_LS_TTL_SHIFT 0
+
+#endif /* _UAPI_MPLS_H */
--
1.7.10.4
--
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