1#ifndef _MPLS_H
2#define _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
21struct 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#define MPLS_LABEL_FIRST_UNRESERVED	16 /* RFC3032 */
45
46#endif /* _MPLS_H */
47