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>
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 hook_mask);
/* Called when entry of this type deleted. */
void (*destroy)(const struct xt_match *match, void *matchinfo);
/* 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;
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 **pskb,
const struct net_device *in,
const struct net_device *out,
unsigned int hooknum,
const struct xt_target *target,
const void *targinfo);
/* 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 hook_mask);
/* 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;
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... */
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_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(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;
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(int af);
extern void xt_compat_unlock(int af);
extern int xt_compat_match_offset(struct xt_match *match);
extern void xt_compat_match_from_user(struct xt_entry_match *m,
void **dstptr, int *size);
extern int xt_compat_match_to_user(struct xt_entry_match *m,
void __user **dstptr, int *size);
extern int xt_compat_target_offset(struct xt_target *target);
extern void xt_compat_target_from_user(struct xt_entry_target *t,
void **dstptr, int *size);
extern int xt_compat_target_to_user(struct xt_entry_target *t,
void __user **dstptr, int *size);
#endif /* CONFIG_COMPAT */
#endif /* __KERNEL__ */
#endif /* _X_TABLES_H */