/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

#ifndef _X_TABLES_H

#define _X_TABLES_H

#include <linux/kernel.h>

#include <linux/types.h>

#define XT_FUNCTION_MAXNAMELEN 30

#define XT_EXTENSION_MAXNAMELEN 29

#define XT_TABLE_MAXNAMELEN 32

struct xt_entry_match {

	union {

		struct {

			__u16 match_size;

			/* Used by userspace */

			char name[XT_EXTENSION_MAXNAMELEN];

			__u8 revision;

		} user;

		struct {

			__u16 match_size;

			/* Used inside the kernel */

			struct xt_match *match;

		} kernel;

		/* Total length */

		__u16 match_size;

	} u;

	unsigned char data[0];

};

struct xt_entry_target {

	union {

		struct {

			__u16 target_size;

			/* Used by userspace */

			char name[XT_EXTENSION_MAXNAMELEN];

			__u8 revision;

		} user;

		struct {

			__u16 target_size;

			/* Used inside the kernel */

			struct xt_target *target;

		} kernel;

		/* Total length */

		__u16 target_size;

	} u;

	unsigned char data[0];

};

#define XT_TARGET_INIT(__name, __size)					       \

{									       \

	.target.u.user = {						       \

		.target_size	= XT_ALIGN(__size),			       \

		.name		= __name,				       \

	},								       \

}

struct xt_standard_target {

	struct xt_entry_target target;

	int verdict;

};

struct xt_error_target {

	struct xt_entry_target target;

	char errorname[XT_FUNCTION_MAXNAMELEN];

};

/* The argument to IPT_SO_GET_REVISION_*.  Returns highest revision

 * kernel supports, if >= revision. */

struct xt_get_revision {

	char name[XT_EXTENSION_MAXNAMELEN];

	__u8 revision;

};

/* CONTINUE verdict for targets */

#define XT_CONTINUE 0xFFFFFFFF

/* For standard target */

#define XT_RETURN (-NF_REPEAT - 1)

/* this is a dummy structure to find out the alignment requirement for a struct

 * containing all the fundamental data types that are used in ipt_entry,

 * ip6t_entry and arpt_entry.  This sucks, and it is a hack.  It will be my

 * personal pleasure to remove it -HW

 */

struct _xt_align {

	__u8 u8;

	__u16 u16;

	__u32 u32;

	__u64 u64;

};

#define XT_ALIGN(s) __ALIGN_KERNEL((s), __alignof__(struct _xt_align))

/* Standard return verdict, or do jump. */

#define XT_STANDARD_TARGET ""

/* Error verdict. */

#define XT_ERROR_TARGET "ERROR"

#define SET_COUNTER(c,b,p) do { (c).bcnt = (b); (c).pcnt = (p); } while(0)

#define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0)

struct xt_counters {

	__u64 pcnt, bcnt;			/* Packet and byte counters */

};

/* The argument to IPT_SO_ADD_COUNTERS. */

struct xt_counters_info {

	/* Which table. */

	char name[XT_TABLE_MAXNAMELEN];

	unsigned int num_counters;

	/* The counters (actually `number' of these). */

	struct xt_counters counters[0];

};

#define XT_INV_PROTO		0x40	/* Invert the sense of PROTO. */

/* fn returns 0 to continue iteration */

#define XT_MATCH_ITERATE(type, e, fn, args...)			\

({								\

	unsigned int __i;					\

	int __ret = 0;						\

	struct xt_entry_match *__m;				\

								\

	for (__i = sizeof(type);				\

	     __i < (e)->target_offset;				\

	     __i += __m->u.match_size) {			\

		__m = (void *)e + __i;				\

								\

		__ret = fn(__m , ## args);			\

		if (__ret != 0)					\

			break;					\

	}							\

	__ret;							\

})

/* fn returns 0 to continue iteration */

#define XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \

({								\

	unsigned int __i, __n;					\

	int __ret = 0;						\

	type *__entry;						\

								\

	for (__i = 0, __n = 0; __i < (size);			\

	     __i += __entry->next_offset, __n++) { 		\

		__entry = (void *)(entries) + __i;		\

		if (__n < n)					\

			continue;				\

								\

		__ret = fn(__entry , ## args);			\

		if (__ret != 0)					\

			break;					\

	}							\

	__ret;							\

})

/* fn returns 0 to continue iteration */

#define XT_ENTRY_ITERATE(type, entries, size, fn, args...) \

	XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)

/* pos is normally a struct ipt_entry/ip6t_entry/etc. */

#define xt_entry_foreach(pos, ehead, esize) \

	for ((pos) = (typeof(pos))(ehead); \

	     (pos) < (typeof(pos))((char *)(ehead) + (esize)); \

	     (pos) = (typeof(pos))((char *)(pos) + (pos)->next_offset))

/* can only be xt_entry_match, so no use of typeof here */

#define xt_ematch_foreach(pos, entry) \

	for ((pos) = (struct xt_entry_match *)entry->elems; \

	     (pos) < (struct xt_entry_match *)((char *)(entry) + \

	             (entry)->target_offset); \

	     (pos) = (struct xt_entry_match *)((char *)(pos) + \

	             (pos)->u.match_size))

#endif /* _X_TABLES_H */