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The C and C++ Include Header Files

/usr/include/linux/netfilter_ipv6/ip6t_ipv6header.h


$ cat -n /usr/include/linux/netfilter_ipv6/ip6t_ipv6header.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	/* ipv6header match - matches IPv6 packets based
     3	on whether they contain certain headers */
     4	
     5	/* Original idea: Brad Chapman 
     6	 * Rewritten by: Andras Kis-Szabo <kisza@sch.bme.hu> */
     7	
     8	
     9	#ifndef __IPV6HEADER_H
    10	#define __IPV6HEADER_H
    11	
    12	#include <linux/types.h>
    13	
    14	struct ip6t_ipv6header_info {
    15		__u8 matchflags;
    16		__u8 invflags;
    17		__u8 modeflag;
    18	};
    19	
    20	#define MASK_HOPOPTS    128
    21	#define MASK_DSTOPTS    64
    22	#define MASK_ROUTING    32
    23	#define MASK_FRAGMENT   16
    24	#define MASK_AH         8
    25	#define MASK_ESP        4
    26	#define MASK_NONE       2
    27	#define MASK_PROTO      1
    28	
    29	#endif /* __IPV6HEADER_H */