Preview: x_tables.h
Size: 4.36 KB
/usr/include/linux/netfilter/x_tables.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _X_TABLES_H
#define _X_TABLES_H
#include <linux/const.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 */
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