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The C and C++ Include Header Files

/usr/include/linux/rpl.h


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

     1	/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
     2	/*
     3	 *  IPv6 RPL-SR implementation
     4	 *
     5	 *  Author:
     6	 *  (C) 2020 Alexander Aring <alex.aring@gmail.com>
     7	 */
     8	
     9	#ifndef _LINUX_RPL_H
    10	#define _LINUX_RPL_H
    11	
    12	#include <asm/byteorder.h>
    13	#include <linux/types.h>
    14	#include <linux/in6.h>
    15	
    16	/*
    17	 * RPL SR Header
    18	 */
    19	struct ipv6_rpl_sr_hdr {
    20		__u8	nexthdr;
    21		__u8	hdrlen;
    22		__u8	type;
    23		__u8	segments_left;
    24	#if defined(__LITTLE_ENDIAN_BITFIELD)
    25		__u32	cmpre:4,
    26			cmpri:4,
    27			reserved:4,
    28			pad:4,
    29			reserved1:16;
    30	#elif defined(__BIG_ENDIAN_BITFIELD)
    31		__u32	cmpri:4,
    32			cmpre:4,
    33			pad:4,
    34			reserved:20;
    35	#else
    36	#error  "Please fix <asm/byteorder.h>"
    37	#endif
    38	
    39		union {
    40			__DECLARE_FLEX_ARRAY(struct in6_addr, addr);
    41			__DECLARE_FLEX_ARRAY(__u8, data);
    42		} segments;
    43	} __attribute__((packed));
    44	
    45	#define rpl_segaddr	segments.addr
    46	#define rpl_segdata	segments.data
    47	
    48	#endif