4 #include <linux/types.h>
6 #define XT_FUNCTION_MAXNAMELEN 30
7 #define XT_TABLE_MAXNAMELEN 32
15 /* Used by userspace */
16 char name
[XT_FUNCTION_MAXNAMELEN
-1];
23 /* Used inside the kernel */
24 struct xt_match
*match
;
31 unsigned char data
[0];
34 struct xt_entry_target
40 /* Used by userspace */
41 char name
[XT_FUNCTION_MAXNAMELEN
-1];
48 /* Used inside the kernel */
49 struct xt_target
*target
;
56 unsigned char data
[0];
59 #define XT_TARGET_INIT(__name, __size) \
62 .target_size = XT_ALIGN(__size), \
67 struct xt_standard_target
69 struct xt_entry_target target
;
73 /* The argument to IPT_SO_GET_REVISION_*. Returns highest revision
74 * kernel supports, if >= revision. */
75 struct xt_get_revision
77 char name
[XT_FUNCTION_MAXNAMELEN
-1];
82 /* CONTINUE verdict for targets */
83 #define XT_CONTINUE 0xFFFFFFFF
85 /* For standard target */
86 #define XT_RETURN (-NF_REPEAT - 1)
88 /* this is a dummy structure to find out the alignment requirement for a struct
89 * containing all the fundamental data types that are used in ipt_entry,
90 * ip6t_entry and arpt_entry. This sucks, and it is a hack. It will be my
91 * personal pleasure to remove it -HW
101 #define XT_ALIGN(s) (((s) + (__alignof__(struct _xt_align)-1)) \
102 & ~(__alignof__(struct _xt_align)-1))
104 /* Standard return verdict, or do jump. */
105 #define XT_STANDARD_TARGET ""
107 #define XT_ERROR_TARGET "ERROR"
109 #define SET_COUNTER(c,b,p) do { (c).bcnt = (b); (c).pcnt = (p); } while(0)
110 #define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0)
114 __u64 pcnt
, bcnt
; /* Packet and byte counters */
117 /* The argument to IPT_SO_ADD_COUNTERS. */
118 struct xt_counters_info
121 char name
[XT_TABLE_MAXNAMELEN
];
123 unsigned int num_counters
;
125 /* The counters (actually `number' of these). */
126 struct xt_counters counters
[0];
129 #define XT_INV_PROTO 0x40 /* Invert the sense of PROTO. */
131 /* fn returns 0 to continue iteration */
132 #define XT_MATCH_ITERATE(type, e, fn, args...) \
136 struct xt_entry_match *__m; \
138 for (__i = sizeof(type); \
139 __i < (e)->target_offset; \
140 __i += __m->u.match_size) { \
141 __m = (void *)e + __i; \
143 __ret = fn(__m , ## args); \
150 /* fn returns 0 to continue iteration */
151 #define XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
153 unsigned int __i, __n; \
157 for (__i = 0, __n = 0; __i < (size); \
158 __i += __entry->next_offset, __n++) { \
159 __entry = (void *)(entries) + __i; \
163 __ret = fn(__entry , ## args); \
170 /* fn returns 0 to continue iteration */
171 #define XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
172 XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
176 #include <linux/netdevice.h>
179 * struct xt_match_param - parameters for match extensions' match functions
181 * @in: input netdevice
182 * @out: output netdevice
183 * @match: struct xt_match through which this function was invoked
184 * @matchinfo: per-match data
185 * @fragoff: packet is a fragment, this is the data offset
186 * @thoff: position of transport header relative to skb->data
187 * @hotdrop: drop packet if we had inspection problems
188 * @family: Actual NFPROTO_* through which the function is invoked
189 * (helpful when match->family == NFPROTO_UNSPEC)
191 struct xt_match_param
{
192 const struct net_device
*in
, *out
;
193 const struct xt_match
*match
;
194 const void *matchinfo
;
202 * struct xt_mtchk_param - parameters for match extensions'
203 * checkentry functions
205 * @table: table the rule is tried to be inserted into
206 * @entryinfo: the family-specific rule data
207 * (struct ipt_ip, ip6t_ip, ebt_entry)
208 * @match: struct xt_match through which this function was invoked
209 * @matchinfo: per-match data
210 * @hook_mask: via which hooks the new rule is reachable
212 struct xt_mtchk_param
{
214 const void *entryinfo
;
215 const struct xt_match
*match
;
217 unsigned int hook_mask
;
221 /* Match destructor parameters */
222 struct xt_mtdtor_param
{
223 const struct xt_match
*match
;
229 * struct xt_target_param - parameters for target extensions' target functions
231 * @hooknum: hook through which this target was invoked
232 * @target: struct xt_target through which this function was invoked
233 * @targinfo: per-target data
235 * Other fields see above.
237 struct xt_target_param
{
238 const struct net_device
*in
, *out
;
239 unsigned int hooknum
;
240 const struct xt_target
*target
;
241 const void *targinfo
;
246 * struct xt_tgchk_param - parameters for target extensions'
247 * checkentry functions
249 * @entryinfo: the family-specific rule data
250 * (struct ipt_entry, ip6t_entry, arpt_entry, ebt_entry)
252 * Other fields see above.
254 struct xt_tgchk_param
{
256 const void *entryinfo
;
257 const struct xt_target
*target
;
259 unsigned int hook_mask
;
263 /* Target destructor parameters */
264 struct xt_tgdtor_param
{
265 const struct xt_target
*target
;
272 struct list_head list
;
274 const char name
[XT_FUNCTION_MAXNAMELEN
-1];
277 /* Return true or false: return FALSE and set *hotdrop = 1 to
278 force immediate packet drop. */
279 /* Arguments changed since 2.6.9, as this must now handle
280 non-linear skb, using skb_header_pointer and
281 skb_ip_make_writable. */
282 bool (*match
)(const struct sk_buff
*skb
,
283 const struct xt_match_param
*);
285 /* Called when user tries to insert an entry of this type. */
286 bool (*checkentry
)(const struct xt_mtchk_param
*);
288 /* Called when entry of this type deleted. */
289 void (*destroy
)(const struct xt_mtdtor_param
*);
291 /* Called when userspace align differs from kernel space one */
292 void (*compat_from_user
)(void *dst
, void *src
);
293 int (*compat_to_user
)(void __user
*dst
, void *src
);
295 /* Set this to THIS_MODULE if you are a module, otherwise NULL */
298 /* Free to use by each match */
302 unsigned int matchsize
;
303 unsigned int compatsize
;
305 unsigned short proto
;
307 unsigned short family
;
310 /* Registration hooks for targets. */
313 struct list_head list
;
315 const char name
[XT_FUNCTION_MAXNAMELEN
-1];
317 /* Returns verdict. Argument order changed since 2.6.9, as this
318 must now handle non-linear skbs, using skb_copy_bits and
319 skb_ip_make_writable. */
320 unsigned int (*target
)(struct sk_buff
*skb
,
321 const struct xt_target_param
*);
323 /* Called when user tries to insert an entry of this type:
324 hook_mask is a bitmask of hooks from which it can be
326 /* Should return true or false. */
327 bool (*checkentry
)(const struct xt_tgchk_param
*);
329 /* Called when entry of this type deleted. */
330 void (*destroy
)(const struct xt_tgdtor_param
*);
332 /* Called when userspace align differs from kernel space one */
333 void (*compat_from_user
)(void *dst
, void *src
);
334 int (*compat_to_user
)(void __user
*dst
, void *src
);
336 /* Set this to THIS_MODULE if you are a module, otherwise NULL */
340 unsigned int targetsize
;
341 unsigned int compatsize
;
343 unsigned short proto
;
345 unsigned short family
;
349 /* Furniture shopping... */
352 struct list_head list
;
354 /* A unique name... */
355 const char name
[XT_TABLE_MAXNAMELEN
];
357 /* What hooks you will enter on */
358 unsigned int valid_hooks
;
360 /* Lock for the curtain */
363 /* Man behind the curtain... */
364 //struct ip6t_table_info *private;
367 /* Set this to THIS_MODULE if you are a module, otherwise NULL */
370 u_int8_t af
; /* address/protocol family */
373 #include <linux/netfilter_ipv4.h>
375 /* The table itself */
380 /* Number of entries: FIXME. --RR */
382 /* Initial number of entries. Needed for module usage count */
383 unsigned int initial_entries
;
385 /* Entry points and underflows */
386 unsigned int hook_entry
[NF_INET_NUMHOOKS
];
387 unsigned int underflow
[NF_INET_NUMHOOKS
];
389 /* ipt_entry tables: one per CPU */
390 /* Note : this field MUST be the last one, see XT_TABLE_INFO_SZ */
394 #define XT_TABLE_INFO_SZ (offsetof(struct xt_table_info, entries) \
395 + nr_cpu_ids * sizeof(char *))
396 extern int xt_register_target(struct xt_target
*target
);
397 extern void xt_unregister_target(struct xt_target
*target
);
398 extern int xt_register_targets(struct xt_target
*target
, unsigned int n
);
399 extern void xt_unregister_targets(struct xt_target
*target
, unsigned int n
);
401 extern int xt_register_match(struct xt_match
*target
);
402 extern void xt_unregister_match(struct xt_match
*target
);
403 extern int xt_register_matches(struct xt_match
*match
, unsigned int n
);
404 extern void xt_unregister_matches(struct xt_match
*match
, unsigned int n
);
406 extern int xt_check_match(struct xt_mtchk_param
*,
407 unsigned int size
, u_int8_t proto
, bool inv_proto
);
408 extern int xt_check_target(struct xt_tgchk_param
*,
409 unsigned int size
, u_int8_t proto
, bool inv_proto
);
411 extern struct xt_table
*xt_register_table(struct net
*net
,
412 struct xt_table
*table
,
413 struct xt_table_info
*bootstrap
,
414 struct xt_table_info
*newinfo
);
415 extern void *xt_unregister_table(struct xt_table
*table
);
417 extern struct xt_table_info
*xt_replace_table(struct xt_table
*table
,
418 unsigned int num_counters
,
419 struct xt_table_info
*newinfo
,
422 extern struct xt_match
*xt_find_match(u8 af
, const char *name
, u8 revision
);
423 extern struct xt_target
*xt_find_target(u8 af
, const char *name
, u8 revision
);
424 extern struct xt_target
*xt_request_find_target(u8 af
, const char *name
,
426 extern int xt_find_revision(u8 af
, const char *name
, u8 revision
,
427 int target
, int *err
);
429 extern struct xt_table
*xt_find_table_lock(struct net
*net
, u_int8_t af
,
431 extern void xt_table_unlock(struct xt_table
*t
);
433 extern int xt_proto_init(struct net
*net
, u_int8_t af
);
434 extern void xt_proto_fini(struct net
*net
, u_int8_t af
);
436 extern struct xt_table_info
*xt_alloc_table_info(unsigned int size
);
437 extern void xt_free_table_info(struct xt_table_info
*info
);
440 #include <net/compat.h>
442 struct compat_xt_entry_match
446 u_int16_t match_size
;
447 char name
[XT_FUNCTION_MAXNAMELEN
- 1];
451 u_int16_t match_size
;
454 u_int16_t match_size
;
456 unsigned char data
[0];
459 struct compat_xt_entry_target
463 u_int16_t target_size
;
464 char name
[XT_FUNCTION_MAXNAMELEN
- 1];
468 u_int16_t target_size
;
469 compat_uptr_t target
;
471 u_int16_t target_size
;
473 unsigned char data
[0];
476 /* FIXME: this works only on 32 bit tasks
477 * need to change whole approach in order to calculate align as function of
478 * current task alignment */
480 struct compat_xt_counters
482 #if defined(CONFIG_X86_64) || defined(CONFIG_IA64)
489 struct compat_xt_counters_info
491 char name
[XT_TABLE_MAXNAMELEN
];
492 compat_uint_t num_counters
;
493 struct compat_xt_counters counters
[0];
496 #define COMPAT_XT_ALIGN(s) (((s) + (__alignof__(struct compat_xt_counters)-1)) \
497 & ~(__alignof__(struct compat_xt_counters)-1))
499 extern void xt_compat_lock(u_int8_t af
);
500 extern void xt_compat_unlock(u_int8_t af
);
502 extern int xt_compat_add_offset(u_int8_t af
, unsigned int offset
, short delta
);
503 extern void xt_compat_flush_offsets(u_int8_t af
);
504 extern short xt_compat_calc_jump(u_int8_t af
, unsigned int offset
);
506 extern int xt_compat_match_offset(const struct xt_match
*match
);
507 extern int xt_compat_match_from_user(struct xt_entry_match
*m
,
508 void **dstptr
, unsigned int *size
);
509 extern int xt_compat_match_to_user(struct xt_entry_match
*m
,
510 void __user
**dstptr
, unsigned int *size
);
512 extern int xt_compat_target_offset(const struct xt_target
*target
);
513 extern void xt_compat_target_from_user(struct xt_entry_target
*t
,
514 void **dstptr
, unsigned int *size
);
515 extern int xt_compat_target_to_user(struct xt_entry_target
*t
,
516 void __user
**dstptr
, unsigned int *size
);
518 #endif /* CONFIG_COMPAT */
519 #endif /* __KERNEL__ */
521 #endif /* _X_TABLES_H */