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#ifndef _MPLS_H
#define _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
/* Reserved labels */
#define MPLS_LABEL_IPV4NULL 0 /* RFC3032 */
#define MPLS_LABEL_RTALERT 1 /* RFC3032 */
#define MPLS_LABEL_IPV6NULL 2 /* RFC3032 */
#define MPLS_LABEL_IMPLNULL 3 /* RFC3032 */
#define MPLS_LABEL_ENTROPY 7 /* RFC6790 */
#define MPLS_LABEL_GAL 13 /* RFC5586 */
#define MPLS_LABEL_OAMALERT 14 /* RFC3429 */
#define MPLS_LABEL_EXTENSION 15 /* RFC7274 */
#define MPLS_LABEL_FIRST_UNRESERVED 16 /* RFC3032 */
#endif /* _MPLS_H */