The C and C++ Include Header Files

/usr/include/linux/netfilter/xt_tcpudp.h


$ cat -n /usr/include/linux/netfilter/xt_tcpudp.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _XT_TCPUDP_H
     3	#define _XT_TCPUDP_H
     4	
     5	#include <linux/types.h>
     6	
     7	/* TCP matching stuff */
     8	struct xt_tcp {
     9		__u16 spts[2];			/* Source port range. */
    10		__u16 dpts[2];			/* Destination port range. */
    11		__u8 option;			/* TCP Option iff non-zero*/
    12		__u8 flg_mask;			/* TCP flags mask byte */
    13		__u8 flg_cmp;			/* TCP flags compare byte */
    14		__u8 invflags;			/* Inverse flags */
    15	};
    16	
    17	/* Values for "inv" field in struct ipt_tcp. */
    18	#define XT_TCP_INV_SRCPT	0x01	/* Invert the sense of source ports. */
    19	#define XT_TCP_INV_DSTPT	0x02	/* Invert the sense of dest ports. */
    20	#define XT_TCP_INV_FLAGS	0x04	/* Invert the sense of TCP flags. */
    21	#define XT_TCP_INV_OPTION	0x08	/* Invert the sense of option test. */
    22	#define XT_TCP_INV_MASK		0x0F	/* All possible flags. */
    23	
    24	/* UDP matching stuff */
    25	struct xt_udp {
    26		__u16 spts[2];			/* Source port range. */
    27		__u16 dpts[2];			/* Destination port range. */
    28		__u8 invflags;			/* Inverse flags */
    29	};
    30	
    31	/* Values for "invflags" field in struct ipt_udp. */
    32	#define XT_UDP_INV_SRCPT	0x01	/* Invert the sense of source ports. */
    33	#define XT_UDP_INV_DSTPT	0x02	/* Invert the sense of dest ports. */
    34	#define XT_UDP_INV_MASK	0x03	/* All possible flags. */
    35	
    36	
    37	#endif