[deliverable/linux.git] / include / linux / netfilter / x_tables.h

#ifndef _X_TABLES_H
#define _X_TABLES_H

#define XT_FUNCTION_MAXNAMELEN 30
#define XT_TABLE_MAXNAMELEN 32

struct xt_entry_match
{
	union {
		struct {
			u_int16_t match_size;

			/* Used by userspace */
			char name[XT_FUNCTION_MAXNAMELEN-1];

			u_int8_t revision;
		} user;
		struct {
			u_int16_t match_size;

			/* Used inside the kernel */
			struct xt_match *match;
		} kernel;

		/* Total length */
		u_int16_t match_size;
	} u;

	unsigned char data[0];
};

struct xt_entry_target
{
	union {
		struct {
			u_int16_t target_size;

			/* Used by userspace */
			char name[XT_FUNCTION_MAXNAMELEN-1];

			u_int8_t revision;
		} user;
		struct {
			u_int16_t target_size;

			/* Used inside the kernel */
			struct xt_target *target;
		} kernel;

		/* Total length */
		u_int16_t 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;
};

/* The argument to IPT_SO_GET_REVISION_*.  Returns highest revision
 * kernel supports, if >= revision. */
struct xt_get_revision
{
	char name[XT_FUNCTION_MAXNAMELEN-1];

	u_int8_t 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
{
	u_int8_t u8;
	u_int16_t u16;
	u_int32_t u32;
	u_int64_t u64;
};

#define XT_ALIGN(s) (((s) + (__alignof__(struct _xt_align)-1)) 	\
			& ~(__alignof__(struct _xt_align)-1))

/* 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
{
	u_int64_t 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)

#ifdef __KERNEL__

#include <linux/netdevice.h>

/**
 * struct xt_match_param - parameters for match extensions' match functions
 *
 * @in:		input netdevice
 * @out:	output netdevice
 * @match:	struct xt_match through which this function was invoked
 * @matchinfo:	per-match data
 * @fragoff:	packet is a fragment, this is the data offset
 * @thoff:	position of transport header relative to skb->data
 * @hotdrop:	drop packet if we had inspection problems
 */
struct xt_match_param {
	const struct net_device *in, *out;
	const struct xt_match *match;
	const void *matchinfo;
	int fragoff;
	unsigned int thoff;
	bool *hotdrop;
};

/**
 * struct xt_mtchk_param - parameters for match extensions'
 * checkentry functions
 *
 * @table:	table the rule is tried to be inserted into
 * @entryinfo:	the family-specific rule data
 * 		(struct ipt_ip, ip6t_ip, ebt_entry)
 * @match:	struct xt_match through which this function was invoked
 * @matchinfo:	per-match data
 * @hook_mask:	via which hooks the new rule is reachable
 */
struct xt_mtchk_param {
	const char *table;
	const void *entryinfo;
	const struct xt_match *match;
	void *matchinfo;
	unsigned int hook_mask;
};

/* Match destructor parameters */
struct xt_mtdtor_param {
	const struct xt_match *match;
	void *matchinfo;
};

/**
 * struct xt_target_param - parameters for target extensions' target functions
 *
 * @hooknum:	hook through which this target was invoked
 * @target:	struct xt_target through which this function was invoked
 * @targinfo:	per-target data
 *
 * Other fields see above.
 */
struct xt_target_param {
	const struct net_device *in, *out;
	unsigned int hooknum;
	const struct xt_target *target;
	const void *targinfo;
};

/**
 * struct xt_tgchk_param - parameters for target extensions'
 * checkentry functions
 *
 * @entryinfo:	the family-specific rule data
 * 		(struct ipt_entry, ip6t_entry, arpt_entry, ebt_entry)
 *
 * Other fields see above.
 */
struct xt_tgchk_param {
	const char *table;
	void *entryinfo;
	const struct xt_target *target;
	void *targinfo;
	unsigned int hook_mask;
};

struct xt_match
{
	struct list_head list;

	const char name[XT_FUNCTION_MAXNAMELEN-1];

	/* Return true or false: return FALSE and set *hotdrop = 1 to
           force immediate packet drop. */
	/* Arguments changed since 2.6.9, as this must now handle
	   non-linear skb, using skb_header_pointer and
	   skb_ip_make_writable. */
	bool (*match)(const struct sk_buff *skb,
		      const struct xt_match_param *);

	/* Called when user tries to insert an entry of this type. */
	bool (*checkentry)(const struct xt_mtchk_param *);

	/* Called when entry of this type deleted. */
	void (*destroy)(const struct xt_mtdtor_param *);

	/* Called when userspace align differs from kernel space one */
	void (*compat_from_user)(void *dst, void *src);
	int (*compat_to_user)(void __user *dst, void *src);

	/* Set this to THIS_MODULE if you are a module, otherwise NULL */
	struct module *me;

	/* Free to use by each match */
	unsigned long data;

	const char *table;
	unsigned int matchsize;
	unsigned int compatsize;
	unsigned int hooks;
	unsigned short proto;

	unsigned short family;
	u_int8_t revision;
};

/* Registration hooks for targets. */
struct xt_target
{
	struct list_head list;

	const char name[XT_FUNCTION_MAXNAMELEN-1];

	/* Returns verdict. Argument order changed since 2.6.9, as this
	   must now handle non-linear skbs, using skb_copy_bits and
	   skb_ip_make_writable. */
	unsigned int (*target)(struct sk_buff *skb,
			       const struct xt_target_param *);

	/* Called when user tries to insert an entry of this type:
           hook_mask is a bitmask of hooks from which it can be
           called. */
	/* Should return true or false. */
	bool (*checkentry)(const struct xt_tgchk_param *);

	/* Called when entry of this type deleted. */
	void (*destroy)(const struct xt_target *target, void *targinfo);

	/* Called when userspace align differs from kernel space one */
	void (*compat_from_user)(void *dst, void *src);
	int (*compat_to_user)(void __user *dst, void *src);

	/* Set this to THIS_MODULE if you are a module, otherwise NULL */
	struct module *me;

	const char *table;
	unsigned int targetsize;
	unsigned int compatsize;
	unsigned int hooks;
	unsigned short proto;

	unsigned short family;
	u_int8_t revision;
};

/* Furniture shopping... */
struct xt_table
{
	struct list_head list;

	/* A unique name... */
	const char name[XT_TABLE_MAXNAMELEN];

	/* What hooks you will enter on */
	unsigned int valid_hooks;

	/* Lock for the curtain */
	rwlock_t lock;

	/* Man behind the curtain... */
	//struct ip6t_table_info *private;
	void *private;

	/* Set this to THIS_MODULE if you are a module, otherwise NULL */
	struct module *me;

	u_int8_t af;		/* address/protocol family */
};

#include <linux/netfilter_ipv4.h>

/* The table itself */
struct xt_table_info
{
	/* Size per table */
	unsigned int size;
	/* Number of entries: FIXME. --RR */
	unsigned int number;
	/* Initial number of entries. Needed for module usage count */
	unsigned int initial_entries;

	/* Entry points and underflows */
	unsigned int hook_entry[NF_INET_NUMHOOKS];
	unsigned int underflow[NF_INET_NUMHOOKS];

	/* ipt_entry tables: one per CPU */
	/* Note : this field MUST be the last one, see XT_TABLE_INFO_SZ */
	char *entries[1];
};

#define XT_TABLE_INFO_SZ (offsetof(struct xt_table_info, entries) \
			  + nr_cpu_ids * sizeof(char *))
extern int xt_register_target(struct xt_target *target);
extern void xt_unregister_target(struct xt_target *target);
extern int xt_register_targets(struct xt_target *target, unsigned int n);
extern void xt_unregister_targets(struct xt_target *target, unsigned int n);

extern int xt_register_match(struct xt_match *target);
extern void xt_unregister_match(struct xt_match *target);
extern int xt_register_matches(struct xt_match *match, unsigned int n);
extern void xt_unregister_matches(struct xt_match *match, unsigned int n);

extern int xt_check_match(struct xt_mtchk_param *, u_int8_t family,
			  unsigned int size, u_int8_t proto, bool inv_proto);
extern int xt_check_target(struct xt_tgchk_param *, u_int8_t family,
			   unsigned int size, u_int8_t proto, bool inv_proto);

extern struct xt_table *xt_register_table(struct net *net,
					  struct xt_table *table,
					  struct xt_table_info *bootstrap,
					  struct xt_table_info *newinfo);
extern void *xt_unregister_table(struct xt_table *table);

extern struct xt_table_info *xt_replace_table(struct xt_table *table,
					      unsigned int num_counters,
					      struct xt_table_info *newinfo,
					      int *error);

extern struct xt_match *xt_find_match(u8 af, const char *name, u8 revision);
extern struct xt_target *xt_find_target(u8 af, const char *name, u8 revision);
extern struct xt_target *xt_request_find_target(u8 af, const char *name,
						u8 revision);
extern int xt_find_revision(u8 af, const char *name, u8 revision,
			    int target, int *err);

extern struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af,
					   const char *name);
extern void xt_table_unlock(struct xt_table *t);

extern int xt_proto_init(struct net *net, u_int8_t af);
extern void xt_proto_fini(struct net *net, u_int8_t af);

extern struct xt_table_info *xt_alloc_table_info(unsigned int size);
extern void xt_free_table_info(struct xt_table_info *info);

#ifdef CONFIG_COMPAT
#include <net/compat.h>

struct compat_xt_entry_match
{
	union {
		struct {
			u_int16_t match_size;
			char name[XT_FUNCTION_MAXNAMELEN - 1];
			u_int8_t revision;
		} user;
		struct {
			u_int16_t match_size;
			compat_uptr_t match;
		} kernel;
		u_int16_t match_size;
	} u;
	unsigned char data[0];
};

struct compat_xt_entry_target
{
	union {
		struct {
			u_int16_t target_size;
			char name[XT_FUNCTION_MAXNAMELEN - 1];
			u_int8_t revision;
		} user;
		struct {
			u_int16_t target_size;
			compat_uptr_t target;
		} kernel;
		u_int16_t target_size;
	} u;
	unsigned char data[0];
};

/* FIXME: this works only on 32 bit tasks
 * need to change whole approach in order to calculate align as function of
 * current task alignment */

struct compat_xt_counters
{
#if defined(CONFIG_X86_64) || defined(CONFIG_IA64)
	u_int32_t cnt[4];
#else
	u_int64_t cnt[2];
#endif
};

struct compat_xt_counters_info
{
	char name[XT_TABLE_MAXNAMELEN];
	compat_uint_t num_counters;
	struct compat_xt_counters counters[0];
};

#define COMPAT_XT_ALIGN(s) (((s) + (__alignof__(struct compat_xt_counters)-1)) \
		& ~(__alignof__(struct compat_xt_counters)-1))

extern void xt_compat_lock(u_int8_t af);
extern void xt_compat_unlock(u_int8_t af);

extern int xt_compat_add_offset(u_int8_t af, unsigned int offset, short delta);
extern void xt_compat_flush_offsets(u_int8_t af);
extern short xt_compat_calc_jump(u_int8_t af, unsigned int offset);

extern int xt_compat_match_offset(const struct xt_match *match);
extern int xt_compat_match_from_user(struct xt_entry_match *m,
				     void **dstptr, unsigned int *size);
extern int xt_compat_match_to_user(struct xt_entry_match *m,
				   void __user **dstptr, unsigned int *size);

extern int xt_compat_target_offset(const struct xt_target *target);
extern void xt_compat_target_from_user(struct xt_entry_target *t,
				       void **dstptr, unsigned int *size);
extern int xt_compat_target_to_user(struct xt_entry_target *t,
				    void __user **dstptr, unsigned int *size);

#endif /* CONFIG_COMPAT */
#endif /* __KERNEL__ */

#endif /* _X_TABLES_H */
Commit	Line	Data
2e4e6a17 HW	1	#ifndef _X_TABLES_H
	2	#define _X_TABLES_H
	3
	4	#define XT_FUNCTION_MAXNAMELEN 30
	5	#define XT_TABLE_MAXNAMELEN 32
	6
1e30a014 DM	7	struct xt_entry_match
	8	{
	9	union {
	10	struct {
	11	u_int16_t match_size;
	12
	13	/* Used by userspace */
	14	char name[XT_FUNCTION_MAXNAMELEN-1];
	15
	16	u_int8_t revision;
	17	} user;
	18	struct {
	19	u_int16_t match_size;
	20
	21	/* Used inside the kernel */
	22	struct xt_match *match;
	23	} kernel;
	24
	25	/* Total length */
	26	u_int16_t match_size;
	27	} u;
	28
	29	unsigned char data[0];
	30	};
	31
	32	struct xt_entry_target
	33	{
	34	union {
	35	struct {
	36	u_int16_t target_size;
	37
	38	/* Used by userspace */
	39	char name[XT_FUNCTION_MAXNAMELEN-1];
	40
	41	u_int8_t revision;
	42	} user;
	43	struct {
	44	u_int16_t target_size;
	45
	46	/* Used inside the kernel */
	47	struct xt_target *target;
	48	} kernel;
	49
	50	/* Total length */
	51	u_int16_t target_size;
	52	} u;
	53
	54	unsigned char data[0];
	55	};
	56
3c2ad469 PM	57	#define XT_TARGET_INIT(__name, __size) \
	58	{ \
	59	.target.u.user = { \
	60	.target_size = XT_ALIGN(__size), \
	61	.name = __name, \
	62	}, \
	63	}
	64
1e30a014 DM	65	struct xt_standard_target
	66	{
	67	struct xt_entry_target target;
	68	int verdict;
	69	};
	70
2e4e6a17 HW	71	/* The argument to IPT_SO_GET_REVISION_*. Returns highest revision
	72	* kernel supports, if >= revision. */
	73	struct xt_get_revision
	74	{
	75	char name[XT_FUNCTION_MAXNAMELEN-1];
	76
	77	u_int8_t revision;
	78	};
	79
	80	/* CONTINUE verdict for targets */
	81	#define XT_CONTINUE 0xFFFFFFFF
	82
	83	/* For standard target */
	84	#define XT_RETURN (-NF_REPEAT - 1)
	85
6fbfc968 DM	86	/* this is a dummy structure to find out the alignment requirement for a struct
	87	* containing all the fundamental data types that are used in ipt_entry,
	88	* ip6t_entry and arpt_entry. This sucks, and it is a hack. It will be my
	89	* personal pleasure to remove it -HW
	90	*/
	91	struct _xt_align
	92	{
	93	u_int8_t u8;
	94	u_int16_t u16;
	95	u_int32_t u32;
	96	u_int64_t u64;
	97	};
	98
	99	#define XT_ALIGN(s) (((s) + (__alignof__(struct _xt_align)-1)) \
	100	& ~(__alignof__(struct _xt_align)-1))
2e4e6a17 HW	101
	102	/* Standard return verdict, or do jump. */
	103	#define XT_STANDARD_TARGET ""
	104	/* Error verdict. */
	105	#define XT_ERROR_TARGET "ERROR"
	106
2e4e6a17 HW	107	#define SET_COUNTER(c,b,p) do { (c).bcnt = (b); (c).pcnt = (p); } while(0)
	108	#define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0)
	109
	110	struct xt_counters
	111	{
	112	u_int64_t pcnt, bcnt; /* Packet and byte counters */
	113	};
	114
	115	/* The argument to IPT_SO_ADD_COUNTERS. */
	116	struct xt_counters_info
	117	{
	118	/* Which table. */
	119	char name[XT_TABLE_MAXNAMELEN];
	120
	121	unsigned int num_counters;
	122
	123	/* The counters (actually `number' of these). */
	124	struct xt_counters counters[0];
	125	};
	126
	127	#define XT_INV_PROTO 0x40 /* Invert the sense of PROTO. */
	128
89c002d6 PM	129	/* fn returns 0 to continue iteration */
	130	#define XT_MATCH_ITERATE(type, e, fn, args...) \
	131	({ \
	132	unsigned int __i; \
	133	int __ret = 0; \
	134	struct xt_entry_match *__m; \
	135	\
	136	for (__i = sizeof(type); \
	137	__i < (e)->target_offset; \
	138	__i += __m->u.match_size) { \
	139	__m = (void *)e + __i; \
	140	\
	141	__ret = fn(__m , ## args); \
	142	if (__ret != 0) \
	143	break; \
	144	} \
	145	__ret; \
	146	})
	147
	148	/* fn returns 0 to continue iteration */
	149	#define XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
	150	({ \
	151	unsigned int __i, __n; \
	152	int __ret = 0; \
	153	type *__entry; \
	154	\
	155	for (__i = 0, __n = 0; __i < (size); \
	156	__i += __entry->next_offset, __n++) { \
	157	__entry = (void *)(entries) + __i; \
	158	if (__n < n) \
	159	continue; \
	160	\
	161	__ret = fn(__entry , ## args); \
	162	if (__ret != 0) \
	163	break; \
	164	} \
	165	__ret; \
	166	})
	167
	168	/* fn returns 0 to continue iteration */
	169	#define XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
	170	XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
	171
2e4e6a17 HW	172	#ifdef __KERNEL__
	173
	174	#include <linux/netdevice.h>
	175
f7108a20 JE	176	/**
	177	* struct xt_match_param - parameters for match extensions' match functions
	178	*
	179	* @in: input netdevice
	180	* @out: output netdevice
	181	* @match: struct xt_match through which this function was invoked
	182	* @matchinfo: per-match data
	183	* @fragoff: packet is a fragment, this is the data offset
	184	* @thoff: position of transport header relative to skb->data
	185	* @hotdrop: drop packet if we had inspection problems
	186	*/
	187	struct xt_match_param {
	188	const struct net_device in, out;
	189	const struct xt_match *match;
	190	const void *matchinfo;
	191	int fragoff;
	192	unsigned int thoff;
	193	bool *hotdrop;
	194	};
	195
9b4fce7a JE	196	/**
	197	* struct xt_mtchk_param - parameters for match extensions'
	198	* checkentry functions
	199	*
	200	* @table: table the rule is tried to be inserted into
	201	* @entryinfo: the family-specific rule data
	202	* (struct ipt_ip, ip6t_ip, ebt_entry)
	203	* @match: struct xt_match through which this function was invoked
	204	* @matchinfo: per-match data
	205	* @hook_mask: via which hooks the new rule is reachable
	206	*/
	207	struct xt_mtchk_param {
	208	const char *table;
	209	const void *entryinfo;
	210	const struct xt_match *match;
	211	void *matchinfo;
	212	unsigned int hook_mask;
	213	};
	214
6be3d859 JE	215	/* Match destructor parameters */
	216	struct xt_mtdtor_param {
	217	const struct xt_match *match;
	218	void *matchinfo;
	219	};
	220
7eb35586 JE	221	/**
	222	* struct xt_target_param - parameters for target extensions' target functions
	223	*
	224	* @hooknum: hook through which this target was invoked
	225	* @target: struct xt_target through which this function was invoked
	226	* @targinfo: per-target data
	227	*
	228	* Other fields see above.
	229	*/
	230	struct xt_target_param {
	231	const struct net_device in, out;
	232	unsigned int hooknum;
	233	const struct xt_target *target;
	234	const void *targinfo;
	235	};
	236
af5d6dc2 JE	237	/**
	238	* struct xt_tgchk_param - parameters for target extensions'
	239	* checkentry functions
	240	*
	241	* @entryinfo: the family-specific rule data
	242	* (struct ipt_entry, ip6t_entry, arpt_entry, ebt_entry)
	243	*
	244	* Other fields see above.
	245	*/
	246	struct xt_tgchk_param {
	247	const char *table;
	248	void *entryinfo;
	249	const struct xt_target *target;
	250	void *targinfo;
	251	unsigned int hook_mask;
	252	};
	253
2e4e6a17 HW	254	struct xt_match
	255	{
	256	struct list_head list;
	257
	258	const char name[XT_FUNCTION_MAXNAMELEN-1];
	259
2e4e6a17 HW	260	/* Return true or false: return FALSE and set *hotdrop = 1 to
	261	force immediate packet drop. */
	262	/* Arguments changed since 2.6.9, as this must now handle
	263	non-linear skb, using skb_header_pointer and
	264	skb_ip_make_writable. */
1d93a9cb	265	bool (match)(const struct sk_buff skb,
f7108a20	266	const struct xt_match_param *);
2e4e6a17 HW	267
2e4e6a17 HW	268	/* Called when user tries to insert an entry of this type. */
9b4fce7a	269	bool (checkentry)(const struct xt_mtchk_param );
2e4e6a17 HW	270
2e4e6a17 HW	271	/* Called when entry of this type deleted. */
6be3d859	272	void (destroy)(const struct xt_mtdtor_param );
2e4e6a17	273
2722971c	274	/* Called when userspace align differs from kernel space one */
9fa492cd PM	275	void (compat_from_user)(void dst, void *src);
9fa492cd PM	276	int (compat_to_user)(void __user dst, void *src);
2722971c	277
2e4e6a17 HW	278	/* Set this to THIS_MODULE if you are a module, otherwise NULL */
2e4e6a17 HW	279	struct module *me;
37f9f733	280
91270cf8 PM	281	/* Free to use by each match */
	282	unsigned long data;
	283
ecb6f85e	284	const char *table;
37f9f733	285	unsigned int matchsize;
9fa492cd	286	unsigned int compatsize;
37f9f733 PM	287	unsigned int hooks;
37f9f733 PM	288	unsigned short proto;
c4b88513 PM	289
c4b88513 PM	290	unsigned short family;
37f9f733	291	u_int8_t revision;
2e4e6a17 HW	292	};
	293
	294	/* Registration hooks for targets. */
	295	struct xt_target
	296	{
	297	struct list_head list;
	298
	299	const char name[XT_FUNCTION_MAXNAMELEN-1];
	300
2e4e6a17 HW	301	/* Returns verdict. Argument order changed since 2.6.9, as this
	302	must now handle non-linear skbs, using skb_copy_bits and
	303	skb_ip_make_writable. */
3db05fea	304	unsigned int (target)(struct sk_buff skb,
7eb35586	305	const struct xt_target_param *);
2e4e6a17 HW	306
	307	/* Called when user tries to insert an entry of this type:
	308	hook_mask is a bitmask of hooks from which it can be
	309	called. */
	310	/* Should return true or false. */
af5d6dc2	311	bool (checkentry)(const struct xt_tgchk_param );
2e4e6a17 HW	312
2e4e6a17 HW	313	/* Called when entry of this type deleted. */
efa74165	314	void (destroy)(const struct xt_target target, void *targinfo);
2e4e6a17	315
2722971c	316	/* Called when userspace align differs from kernel space one */
9fa492cd PM	317	void (compat_from_user)(void dst, void *src);
9fa492cd PM	318	int (compat_to_user)(void __user dst, void *src);
2722971c	319
2e4e6a17 HW	320	/* Set this to THIS_MODULE if you are a module, otherwise NULL */
2e4e6a17 HW	321	struct module *me;
37f9f733	322
ecb6f85e	323	const char *table;
37f9f733	324	unsigned int targetsize;
9fa492cd	325	unsigned int compatsize;
37f9f733 PM	326	unsigned int hooks;
37f9f733 PM	327	unsigned short proto;
c4b88513 PM	328
c4b88513 PM	329	unsigned short family;
37f9f733	330	u_int8_t revision;
2e4e6a17 HW	331	};
	332
	333	/* Furniture shopping... */
	334	struct xt_table
	335	{
	336	struct list_head list;
	337
	338	/* A unique name... */
ecb6f85e	339	const char name[XT_TABLE_MAXNAMELEN];
2e4e6a17 HW	340
	341	/* What hooks you will enter on */
	342	unsigned int valid_hooks;
	343
	344	/* Lock for the curtain */
	345	rwlock_t lock;
	346
	347	/* Man behind the curtain... */
	348	//struct ip6t_table_info *private;
	349	void *private;
	350
	351	/* Set this to THIS_MODULE if you are a module, otherwise NULL */
	352	struct module *me;
	353
76108cea	354	u_int8_t af; /* address/protocol family */
2e4e6a17 HW	355	};
	356
	357	#include <linux/netfilter_ipv4.h>
	358
	359	/* The table itself */
	360	struct xt_table_info
	361	{
	362	/* Size per table */
	363	unsigned int size;
	364	/* Number of entries: FIXME. --RR */
	365	unsigned int number;
	366	/* Initial number of entries. Needed for module usage count */
	367	unsigned int initial_entries;
	368
	369	/* Entry points and underflows */
6e23ae2a PM	370	unsigned int hook_entry[NF_INET_NUMHOOKS];
6e23ae2a PM	371	unsigned int underflow[NF_INET_NUMHOOKS];
2e4e6a17 HW	372
2e4e6a17 HW	373	/* ipt_entry tables: one per CPU */
259d4e41 ED	374	/* Note : this field MUST be the last one, see XT_TABLE_INFO_SZ */
259d4e41 ED	375	char *entries[1];
2e4e6a17 HW	376	};
2e4e6a17 HW	377
259d4e41 ED	378	#define XT_TABLE_INFO_SZ (offsetof(struct xt_table_info, entries) \
259d4e41 ED	379	+ nr_cpu_ids * sizeof(char *))
a45049c5 PNA	380	extern int xt_register_target(struct xt_target *target);
a45049c5 PNA	381	extern void xt_unregister_target(struct xt_target *target);
52d9c42e PM	382	extern int xt_register_targets(struct xt_target *target, unsigned int n);
	383	extern void xt_unregister_targets(struct xt_target *target, unsigned int n);
	384
a45049c5 PNA	385	extern int xt_register_match(struct xt_match *target);
a45049c5 PNA	386	extern void xt_unregister_match(struct xt_match *target);
52d9c42e PM	387	extern int xt_register_matches(struct xt_match *match, unsigned int n);
52d9c42e PM	388	extern void xt_unregister_matches(struct xt_match *match, unsigned int n);
2e4e6a17	389
9b4fce7a JE	390	extern int xt_check_match(struct xt_mtchk_param *, u_int8_t family,
9b4fce7a JE	391	unsigned int size, u_int8_t proto, bool inv_proto);
af5d6dc2 JE	392	extern int xt_check_target(struct xt_tgchk_param *, u_int8_t family,
af5d6dc2 JE	393	unsigned int size, u_int8_t proto, bool inv_proto);
37f9f733	394
8d870052 AD	395	extern struct xt_table xt_register_table(struct net net,
8d870052 AD	396	struct xt_table *table,
a98da11d AD	397	struct xt_table_info *bootstrap,
a98da11d AD	398	struct xt_table_info *newinfo);
2e4e6a17 HW	399	extern void xt_unregister_table(struct xt_table table);
	400
	401	extern struct xt_table_info xt_replace_table(struct xt_table table,
	402	unsigned int num_counters,
	403	struct xt_table_info *newinfo,
	404	int *error);
	405
76108cea JE	406	extern struct xt_match xt_find_match(u8 af, const char name, u8 revision);
	407	extern struct xt_target xt_find_target(u8 af, const char name, u8 revision);
	408	extern struct xt_target xt_request_find_target(u8 af, const char name,
2e4e6a17	409	u8 revision);
76108cea JE	410	extern int xt_find_revision(u8 af, const char *name, u8 revision,
76108cea JE	411	int target, int *err);
2e4e6a17	412
76108cea	413	extern struct xt_table xt_find_table_lock(struct net net, u_int8_t af,
8d870052	414	const char *name);
2e4e6a17 HW	415	extern void xt_table_unlock(struct xt_table *t);
2e4e6a17 HW	416
76108cea JE	417	extern int xt_proto_init(struct net *net, u_int8_t af);
76108cea JE	418	extern void xt_proto_fini(struct net *net, u_int8_t af);
2e4e6a17 HW	419
	420	extern struct xt_table_info *xt_alloc_table_info(unsigned int size);
	421	extern void xt_free_table_info(struct xt_table_info *info);
	422
2722971c DM	423	#ifdef CONFIG_COMPAT
	424	#include <net/compat.h>
	425
	426	struct compat_xt_entry_match
	427	{
	428	union {
	429	struct {
	430	u_int16_t match_size;
	431	char name[XT_FUNCTION_MAXNAMELEN - 1];
	432	u_int8_t revision;
	433	} user;
46c5ea3c PM	434	struct {
	435	u_int16_t match_size;
	436	compat_uptr_t match;
	437	} kernel;
2722971c DM	438	u_int16_t match_size;
	439	} u;
	440	unsigned char data[0];
	441	};
	442
	443	struct compat_xt_entry_target
	444	{
	445	union {
	446	struct {
	447	u_int16_t target_size;
	448	char name[XT_FUNCTION_MAXNAMELEN - 1];
	449	u_int8_t revision;
	450	} user;
46c5ea3c PM	451	struct {
	452	u_int16_t target_size;
	453	compat_uptr_t target;
	454	} kernel;
2722971c DM	455	u_int16_t target_size;
	456	} u;
	457	unsigned char data[0];
	458	};
	459
	460	/* FIXME: this works only on 32 bit tasks
	461	* need to change whole approach in order to calculate align as function of
	462	* current task alignment */
	463
	464	struct compat_xt_counters
	465	{
55fe5866	466	#if defined(CONFIG_X86_64) \|\| defined(CONFIG_IA64)
2722971c	467	u_int32_t cnt[4];
55fe5866 PM	468	#else
	469	u_int64_t cnt[2];
	470	#endif
2722971c DM	471	};
	472
	473	struct compat_xt_counters_info
	474	{
	475	char name[XT_TABLE_MAXNAMELEN];
	476	compat_uint_t num_counters;
	477	struct compat_xt_counters counters[0];
	478	};
	479
	480	#define COMPAT_XT_ALIGN(s) (((s) + (__alignof__(struct compat_xt_counters)-1)) \
	481	& ~(__alignof__(struct compat_xt_counters)-1))
	482
76108cea JE	483	extern void xt_compat_lock(u_int8_t af);
76108cea JE	484	extern void xt_compat_unlock(u_int8_t af);
9fa492cd	485
76108cea JE	486	extern int xt_compat_add_offset(u_int8_t af, unsigned int offset, short delta);
	487	extern void xt_compat_flush_offsets(u_int8_t af);
	488	extern short xt_compat_calc_jump(u_int8_t af, unsigned int offset);
b386d9f5	489
5452e425	490	extern int xt_compat_match_offset(const struct xt_match *match);
89566951	491	extern int xt_compat_match_from_user(struct xt_entry_match *m,
b0a6363c	492	void *dstptr, unsigned int size);
9fa492cd	493	extern int xt_compat_match_to_user(struct xt_entry_match *m,
b0a6363c	494	void __user *dstptr, unsigned int size);
9fa492cd	495
5452e425	496	extern int xt_compat_target_offset(const struct xt_target *target);
9fa492cd	497	extern void xt_compat_target_from_user(struct xt_entry_target *t,
b0a6363c	498	void *dstptr, unsigned int size);
9fa492cd	499	extern int xt_compat_target_to_user(struct xt_entry_target *t,
b0a6363c	500	void __user *dstptr, unsigned int size);
2722971c DM	501
2722971c DM	502	#endif /* CONFIG_COMPAT */
2e4e6a17 HW	503	#endif /* __KERNEL__ */
	504
	505	#endif /* _X_TABLES_H */