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Commit f3baa393 authored by Simon Wunderlich's avatar Simon Wunderlich Committed by David S. Miller
Browse files

UAPI: add MPLS label stack definition 



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which was superseded by RFC 5462.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: default avatarSimon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: default avatarMathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b62faf3c

include/linux/mpls.h

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#ifndef _LINUX_MPLS_H

#define _LINUX_MPLS_H



#include <uapi/linux/mpls.h>



#endif  /* _LINUX_MPLS_H */

include/uapi/linux/mpls.h

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#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 */