The C and C++ Include Header Files

/usr/include/linux/mpls.h


$ cat -n /usr/include/linux/mpls.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _MPLS_H
     3	#define _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 /* _MPLS_H */