include/uapi/linux/mpls.h

   1 #ifndef _UAPI_MPLS_H
   2 #define _UAPI_MPLS_H
   3
   4 #include <linux/types.h>
   5 #include <asm/byteorder.h>
   6
   7 /* Reference: RFC 5462, RFC 3032
   8  *
   9  *  0                   1                   2                   3
  10  *  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
  11  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  12  * |                Label                  | TC  |S|       TTL     |
  13  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  14  *
  15  *      Label:  Label Value, 20 bits
  16  *      TC:     Traffic Class field, 3 bits
  17  *      S:      Bottom of Stack, 1 bit
  18  *      TTL:    Time to Live, 8 bits
  19  */
  20
  21 struct mpls_label {
  22         __be32 entry;
  23 };
  24
  25 #define MPLS_LS_LABEL_MASK      0xFFFFF000
  26 #define MPLS_LS_LABEL_SHIFT     12
  27 #define MPLS_LS_TC_MASK         0x00000E00
  28 #define MPLS_LS_TC_SHIFT        9
  29 #define MPLS_LS_S_MASK          0x00000100
  30 #define MPLS_LS_S_SHIFT         8
  31 #define MPLS_LS_TTL_MASK        0x000000FF
  32 #define MPLS_LS_TTL_SHIFT       0
  33
  34 /* Reserved labels */
  35 #define MPLS_LABEL_IPV4NULL             0 /* RFC3032 */
  36 #define MPLS_LABEL_RTALERT              1 /* RFC3032 */
  37 #define MPLS_LABEL_IPV6NULL             2 /* RFC3032 */
  38 #define MPLS_LABEL_IMPLNULL             3 /* RFC3032 */
  39 #define MPLS_LABEL_ENTROPY              7 /* RFC6790 */
  40 #define MPLS_LABEL_GAL                  13 /* RFC5586 */
  41 #define MPLS_LABEL_OAMALERT             14 /* RFC3429 */
  42 #define MPLS_LABEL_EXTENSION            15 /* RFC7274 */
  43
  44 #endif /* _UAPI_MPLS_H */