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 
22 struct 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  */
57 enum {
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 
65 struct 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