1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _UAPI_MPLS_H
3#define _UAPI_MPLS_H
4
5#include <linux/types.h>
6#include <asm/byteorder.h>
7
8/* Reference: RFC 5462, RFC 3032
9 *
10 *  0                   1                   2                   3
11 *  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
12 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
13 * |                Label                  | TC  |S|       TTL     |
14 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
15 *
16 *	Label:  Label Value, 20 bits
17 *	TC:     Traffic Class field, 3 bits
18 *	S:      Bottom of Stack, 1 bit
19 *	TTL:    Time to Live, 8 bits
20 */
21
22struct mpls_label {
23	__be32 entry;
24};
25
26#define MPLS_LS_LABEL_MASK      0xFFFFF000
27#define MPLS_LS_LABEL_SHIFT     12
28#define MPLS_LS_TC_MASK         0x00000E00
29#define MPLS_LS_TC_SHIFT        9
30#define MPLS_LS_S_MASK          0x00000100
31#define MPLS_LS_S_SHIFT         8
32#define MPLS_LS_TTL_MASK        0x000000FF
33#define MPLS_LS_TTL_SHIFT       0
34
35/* Reserved labels */
36#define MPLS_LABEL_IPV4NULL		0 /* RFC3032 */
37#define MPLS_LABEL_RTALERT		1 /* RFC3032 */
38#define MPLS_LABEL_IPV6NULL		2 /* RFC3032 */
39#define MPLS_LABEL_IMPLNULL		3 /* RFC3032 */
40#define MPLS_LABEL_ENTROPY		7 /* RFC6790 */
41#define MPLS_LABEL_GAL			13 /* RFC5586 */
42#define MPLS_LABEL_OAMALERT		14 /* RFC3429 */
43#define MPLS_LABEL_EXTENSION		15 /* RFC7274 */
44
45#define MPLS_LABEL_FIRST_UNRESERVED	16 /* RFC3032 */
46
47/* These are embedded into IFLA_STATS_AF_SPEC:
48 * [IFLA_STATS_AF_SPEC]
49 * -> [AF_MPLS]
50 *    -> [MPLS_STATS_xxx]
51 *
52 * Attributes:
53 * [MPLS_STATS_LINK] = {
54 *     struct mpls_link_stats
55 * }
56 */
57enum {
58	MPLS_STATS_UNSPEC, /* also used as 64bit pad attribute */
59	MPLS_STATS_LINK,
60	__MPLS_STATS_MAX,
61};
62
63#define MPLS_STATS_MAX (__MPLS_STATS_MAX - 1)
64
65struct mpls_link_stats {
66	__u64	rx_packets;		/* total packets received	*/
67	__u64	tx_packets;		/* total packets transmitted	*/
68	__u64	rx_bytes;		/* total bytes received		*/
69	__u64	tx_bytes;		/* total bytes transmitted	*/
70	__u64	rx_errors;		/* bad packets received		*/
71	__u64	tx_errors;		/* packet transmit problems	*/
72	__u64	rx_dropped;		/* packet dropped on receive	*/
73	__u64	tx_dropped;		/* packet dropped on transmit	*/
74	__u64	rx_noroute;		/* no route for packet dest	*/
75};
76
77#endif /* _UAPI_MPLS_H */
78