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The C and C++ Include Header Files

cat -n /usr/include/linux/seg6_hmac.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _LINUX_SEG6_HMAC_H
     3	#define _LINUX_SEG6_HMAC_H
     4	
     5	#include <linux/types.h>
     6	#include <linux/seg6.h>
     7	
     8	#define SEG6_HMAC_SECRET_LEN	64
     9	#define SEG6_HMAC_FIELD_LEN	32
    10	
    11	struct sr6_tlv_hmac {
    12		struct sr6_tlv tlvhdr;
    13		__u16 reserved;
    14		__be32 hmackeyid;
    15		__u8 hmac[SEG6_HMAC_FIELD_LEN];
    16	};
    17	
    18	enum {
    19		SEG6_HMAC_ALGO_SHA1 = 1,
    20		SEG6_HMAC_ALGO_SHA256 = 2,
    21	};
    22	
    23	#endif