include/linux/netfilter/x_tables.h - linux/kernel/git/davem/net-next - Git at Google

 #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];
 };

 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"

 /*
  * New IP firewall options for [gs]etsockopt at the RAW IP level.
  * Unlike BSD Linux inherits IP options so you don't have to use a raw
  * socket for this. Instead we check rights in the calls. */
 #define XT_BASE_CTL		64	/* base for firewall socket options */

 #define XT_SO_SET_REPLACE	(XT_BASE_CTL)
 #define XT_SO_SET_ADD_COUNTERS	(XT_BASE_CTL + 1)
 #define XT_SO_SET_MAX		XT_SO_SET_ADD_COUNTERS

 #define XT_SO_GET_INFO			(XT_BASE_CTL)
 #define XT_SO_GET_ENTRIES		(XT_BASE_CTL + 1)
 #define XT_SO_GET_REVISION_MATCH	(XT_BASE_CTL + 2)
 #define XT_SO_GET_REVISION_TARGET	(XT_BASE_CTL + 3)
 #define XT_SO_GET_MAX			XT_SO_GET_REVISION_TARGET

 #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. */

 #ifdef __KERNEL__

 #include <linux/netdevice.h>

 #define ASSERT_READ_LOCK(x)
 #define ASSERT_WRITE_LOCK(x)
 #include <linux/netfilter_ipv4/listhelp.h>

 #ifdef CONFIG_COMPAT
 #define COMPAT_TO_USER		1
 #define COMPAT_FROM_USER	-1
 #define COMPAT_CALC_SIZE	0
 #endif

 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. */
 	int (*match)(const struct sk_buff *skb,
 		     const struct net_device *in,
 		     const struct net_device *out,
 		     const struct xt_match *match,
 		     const void *matchinfo,
 		     int offset,
 		     unsigned int protoff,
 		     int *hotdrop);

 	/* Called when user tries to insert an entry of this type. */
 	/* Should return true or false. */
 	int (*checkentry)(const char *tablename,
 			  const void *ip,
 			  const struct xt_match *match,
 			  void *matchinfo,
 			  unsigned int matchinfosize,
 			  unsigned int hook_mask);

 	/* Called when entry of this type deleted. */
 	void (*destroy)(const struct xt_match *match, void *matchinfo,
 			unsigned int matchinfosize);

 	/* Called when userspace align differs from kernel space one */
 	int (*compat)(void *match, void **dstptr, int *size, int convert);

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

 	char *table;
 	unsigned int matchsize;
 	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 **pskb,
 			       const struct net_device *in,
 			       const struct net_device *out,
 			       unsigned int hooknum,
 			       const struct xt_target *target,
 			       const void *targinfo,
 			       void *userdata);

 	/* 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. */
 	int (*checkentry)(const char *tablename,
 			  const void *entry,
 			  const struct xt_target *target,
 			  void *targinfo,
 			  unsigned int targinfosize,
 			  unsigned int hook_mask);

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

 	/* Called when userspace align differs from kernel space one */
 	int (*compat)(void *target, void **dstptr, int *size, int convert);

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

 	char *table;
 	unsigned int targetsize;
 	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... */
 	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;

 	int 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_IP_NUMHOOKS];
 	unsigned int underflow[NF_IP_NUMHOOKS];

 	/* ipt_entry tables: one per CPU */
 	char *entries[NR_CPUS];
 };

 extern int xt_register_target(struct xt_target *target);
 extern void xt_unregister_target(struct xt_target *target);
 extern int xt_register_match(struct xt_match *target);
 extern void xt_unregister_match(struct xt_match *target);

 extern int xt_check_match(const struct xt_match *match, unsigned short family,
 			  unsigned int size, const char *table, unsigned int hook,
 			  unsigned short proto, int inv_proto);
 extern int xt_check_target(const struct xt_target *target, unsigned short family,
 			   unsigned int size, const char *table, unsigned int hook,
 			   unsigned short proto, int inv_proto);

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

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

 extern int xt_proto_init(int af);
 extern void xt_proto_fini(int 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;
 		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;
 		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(int af);
 extern void xt_compat_unlock(int af);
 extern int xt_compat_match(void *match, void **dstptr, int *size, int convert);
 extern int xt_compat_target(void *target, void **dstptr, int *size,
 		int convert);

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

 #endif /* _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];
	};

	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"

	/*
	* New IP firewall options for [gs]etsockopt at the RAW IP level.
	* Unlike BSD Linux inherits IP options so you don't have to use a raw
	* socket for this. Instead we check rights in the calls. */
	#define XT_BASE_CTL 64 /* base for firewall socket options */

	#define XT_SO_SET_REPLACE (XT_BASE_CTL)
	#define XT_SO_SET_ADD_COUNTERS (XT_BASE_CTL + 1)
	#define XT_SO_SET_MAX XT_SO_SET_ADD_COUNTERS

	#define XT_SO_GET_INFO (XT_BASE_CTL)
	#define XT_SO_GET_ENTRIES (XT_BASE_CTL + 1)
	#define XT_SO_GET_REVISION_MATCH (XT_BASE_CTL + 2)
	#define XT_SO_GET_REVISION_TARGET (XT_BASE_CTL + 3)
	#define XT_SO_GET_MAX XT_SO_GET_REVISION_TARGET

	#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. */

	#ifdef __KERNEL__

	#include <linux/netdevice.h>

	#define ASSERT_READ_LOCK(x)
	#define ASSERT_WRITE_LOCK(x)
	#include <linux/netfilter_ipv4/listhelp.h>

	#ifdef CONFIG_COMPAT
	#define COMPAT_TO_USER 1
	#define COMPAT_FROM_USER -1
	#define COMPAT_CALC_SIZE 0
	#endif

	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. */
	int (match)(const struct sk_buff skb,
	const struct net_device *in,
	const struct net_device *out,
	const struct xt_match *match,
	const void *matchinfo,
	int offset,
	unsigned int protoff,
	int *hotdrop);

	/* Called when user tries to insert an entry of this type. */
	/* Should return true or false. */
	int (checkentry)(const char tablename,
	const void *ip,
	const struct xt_match *match,
	void *matchinfo,
	unsigned int matchinfosize,
	unsigned int hook_mask);

	/* Called when entry of this type deleted. */
	void (destroy)(const struct xt_match match, void *matchinfo,
	unsigned int matchinfosize);

	/* Called when userspace align differs from kernel space one */
	int (compat)(void match, void *dstptr, int size, int convert);

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

	char *table;
	unsigned int matchsize;
	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 *pskb,
	const struct net_device *in,
	const struct net_device *out,
	unsigned int hooknum,
	const struct xt_target *target,
	const void *targinfo,
	void *userdata);

	/* 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. */
	int (checkentry)(const char tablename,
	const void *entry,
	const struct xt_target *target,
	void *targinfo,
	unsigned int targinfosize,
	unsigned int hook_mask);

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

	/* Called when userspace align differs from kernel space one */
	int (compat)(void target, void *dstptr, int size, int convert);

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

	char *table;
	unsigned int targetsize;
	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... */
	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;

	int 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_IP_NUMHOOKS];
	unsigned int underflow[NF_IP_NUMHOOKS];

	/* ipt_entry tables: one per CPU */
	char *entries[NR_CPUS];
	};

	extern int xt_register_target(struct xt_target *target);
	extern void xt_unregister_target(struct xt_target *target);
	extern int xt_register_match(struct xt_match *target);
	extern void xt_unregister_match(struct xt_match *target);

	extern int xt_check_match(const struct xt_match *match, unsigned short family,
	unsigned int size, const char *table, unsigned int hook,
	unsigned short proto, int inv_proto);
	extern int xt_check_target(const struct xt_target *target, unsigned short family,
	unsigned int size, const char *table, unsigned int hook,
	unsigned short proto, int inv_proto);

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

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

	extern int xt_proto_init(int af);
	extern void xt_proto_fini(int 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;
	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;
	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(int af);
	extern void xt_compat_unlock(int af);
	extern int xt_compat_match(void match, void dstptr, int size, int convert);
	extern int xt_compat_target(void target, void dstptr, int size,
	int convert);

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

	#endif /* _X_TABLES_H */