/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

#ifndef _MPLS_H

#define _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

/* Reserved labels */

#define MPLS_LABEL_IPV4NULL		0 /* RFC3032 */

#define MPLS_LABEL_RTALERT		1 /* RFC3032 */

#define MPLS_LABEL_IPV6NULL		2 /* RFC3032 */

#define MPLS_LABEL_IMPLNULL		3 /* RFC3032 */

#define MPLS_LABEL_ENTROPY		7 /* RFC6790 */

#define MPLS_LABEL_GAL			13 /* RFC5586 */

#define MPLS_LABEL_OAMALERT		14 /* RFC3429 */

#define MPLS_LABEL_EXTENSION		15 /* RFC7274 */

#define MPLS_LABEL_FIRST_UNRESERVED	16 /* RFC3032 */

/* These are embedded into IFLA_STATS_AF_SPEC:

 * [IFLA_STATS_AF_SPEC]

 * -> [AF_MPLS]

 *    -> [MPLS_STATS_xxx]

 *

 * Attributes:

 * [MPLS_STATS_LINK] = {

 *     struct mpls_link_stats

 * }

 */

enum {

	MPLS_STATS_UNSPEC, /* also used as 64bit pad attribute */

	MPLS_STATS_LINK,

	__MPLS_STATS_MAX,

};

#define MPLS_STATS_MAX (__MPLS_STATS_MAX - 1)

struct mpls_link_stats {

	__u64	rx_packets;		/* total packets received	*/

	__u64	tx_packets;		/* total packets transmitted	*/

	__u64	rx_bytes;		/* total bytes received		*/

	__u64	tx_bytes;		/* total bytes transmitted	*/

	__u64	rx_errors;		/* bad packets received		*/

	__u64	tx_errors;		/* packet transmit problems	*/

	__u64	rx_dropped;		/* packet dropped on receive	*/

	__u64	tx_dropped;		/* packet dropped on transmit	*/

	__u64	rx_noroute;		/* no route for packet dest	*/

};

#endif /* _MPLS_H */