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Dir : ~/proc/self/root/usr/include/linux/netfilter/

Edit File: xt_tcpudp.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _XT_TCPUDP_H
#define _XT_TCPUDP_H

#include <linux/types.h>

/* TCP matching stuff */
struct xt_tcp {
	__u16 spts[2];			/* Source port range. */
	__u16 dpts[2];			/* Destination port range. */
	__u8 option;			/* TCP Option iff non-zero*/
	__u8 flg_mask;			/* TCP flags mask byte */
	__u8 flg_cmp;			/* TCP flags compare byte */
	__u8 invflags;			/* Inverse flags */
};

/* Values for "inv" field in struct ipt_tcp. */
#define XT_TCP_INV_SRCPT	0x01	/* Invert the sense of source ports. */
#define XT_TCP_INV_DSTPT	0x02	/* Invert the sense of dest ports. */
#define XT_TCP_INV_FLAGS	0x04	/* Invert the sense of TCP flags. */
#define XT_TCP_INV_OPTION	0x08	/* Invert the sense of option test. */
#define XT_TCP_INV_MASK		0x0F	/* All possible flags. */

/* UDP matching stuff */
struct xt_udp {
	__u16 spts[2];			/* Source port range. */
	__u16 dpts[2];			/* Destination port range. */
	__u8 invflags;			/* Inverse flags */
};

/* Values for "invflags" field in struct ipt_udp. */
#define XT_UDP_INV_SRCPT	0x01	/* Invert the sense of source ports. */
#define XT_UDP_INV_DSTPT	0x02	/* Invert the sense of dest ports. */
#define XT_UDP_INV_MASK	0x03	/* All possible flags. */

#endif