4 #define XT_FUNCTION_MAXNAMELEN 30
5 #define XT_TABLE_MAXNAMELEN 32
13 /* Used by userspace */
14 char name[XT_FUNCTION_MAXNAMELEN-1];
21 /* Used inside the kernel */
22 struct xt_match *match;
29 unsigned char data[0];
32 struct xt_entry_target
36 u_int16_t target_size;
38 /* Used by userspace */
39 char name[XT_FUNCTION_MAXNAMELEN-1];
44 u_int16_t target_size;
46 /* Used inside the kernel */
47 struct xt_target *target;
51 u_int16_t target_size;
54 unsigned char data[0];
57 #define XT_TARGET_INIT(__name, __size) \
60 .target_size = XT_ALIGN(__size), \
65 struct xt_standard_target
67 struct xt_entry_target target;
71 /* The argument to IPT_SO_GET_REVISION_*. Returns highest revision
72 * kernel supports, if >= revision. */
73 struct xt_get_revision
75 char name[XT_FUNCTION_MAXNAMELEN-1];
80 /* CONTINUE verdict for targets */
81 #define XT_CONTINUE 0xFFFFFFFF
83 /* For standard target */
84 #define XT_RETURN (-NF_REPEAT - 1)
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
99 #define XT_ALIGN(s) (((s) + (__alignof__(struct _xt_align)-1)) \
100 & ~(__alignof__(struct _xt_align)-1))
102 /* Standard return verdict, or do jump. */
103 #define XT_STANDARD_TARGET ""
105 #define XT_ERROR_TARGET "ERROR"
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)
112 u_int64_t pcnt, bcnt; /* Packet and byte counters */
115 /* The argument to IPT_SO_ADD_COUNTERS. */
116 struct xt_counters_info
119 char name[XT_TABLE_MAXNAMELEN];
121 unsigned int num_counters;
123 /* The counters (actually `number' of these). */
124 struct xt_counters counters[0];
127 #define XT_INV_PROTO 0x40 /* Invert the sense of PROTO. */
129 /* fn returns 0 to continue iteration */
130 #define XT_MATCH_ITERATE(type, e, fn, args...) \
134 struct xt_entry_match *__m; \
136 for (__i = sizeof(type); \
137 __i < (e)->target_offset; \
138 __i += __m->u.match_size) { \
139 __m = (void *)e + __i; \
141 __ret = fn(__m , ## args); \
148 /* fn returns 0 to continue iteration */
149 #define XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
151 unsigned int __i, __n; \
155 for (__i = 0, __n = 0; __i < (size); \
156 __i += __entry->next_offset, __n++) { \
157 __entry = (void *)(entries) + __i; \
161 __ret = fn(__entry , ## args); \
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)
174 #include <linux/netdevice.h>
177 * struct xt_match_param - parameters for match extensions' match functions
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
187 struct xt_match_param {
188 const struct net_device *in, *out;
189 const struct xt_match *match;
190 const void *matchinfo;
197 * struct xt_mtchk_param - parameters for match extensions'
198 * checkentry functions
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
207 struct xt_mtchk_param {
209 const void *entryinfo;
210 const struct xt_match *match;
212 unsigned int hook_mask;
215 /* Match destructor parameters */
216 struct xt_mtdtor_param {
217 const struct xt_match *match;
222 * struct xt_target_param - parameters for target extensions' target functions
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
228 * Other fields see above.
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;
238 * struct xt_tgchk_param - parameters for target extensions'
239 * checkentry functions
241 * @entryinfo: the family-specific rule data
242 * (struct ipt_entry, ip6t_entry, arpt_entry, ebt_entry)
244 * Other fields see above.
246 struct xt_tgchk_param {
249 const struct xt_target *target;
251 unsigned int hook_mask;
256 struct list_head list;
258 const char name[XT_FUNCTION_MAXNAMELEN-1];
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. */
265 bool (*match)(const struct sk_buff *skb,
266 const struct xt_match_param *);
268 /* Called when user tries to insert an entry of this type. */
269 bool (*checkentry)(const struct xt_mtchk_param *);
271 /* Called when entry of this type deleted. */
272 void (*destroy)(const struct xt_mtdtor_param *);
274 /* Called when userspace align differs from kernel space one */
275 void (*compat_from_user)(void *dst, void *src);
276 int (*compat_to_user)(void __user *dst, void *src);
278 /* Set this to THIS_MODULE if you are a module, otherwise NULL */
281 /* Free to use by each match */
285 unsigned int matchsize;
286 unsigned int compatsize;
288 unsigned short proto;
290 unsigned short family;
294 /* Registration hooks for targets. */
297 struct list_head list;
299 const char name[XT_FUNCTION_MAXNAMELEN-1];
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. */
304 unsigned int (*target)(struct sk_buff *skb,
305 const struct xt_target_param *);
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
310 /* Should return true or false. */
311 bool (*checkentry)(const struct xt_tgchk_param *);
313 /* Called when entry of this type deleted. */
314 void (*destroy)(const struct xt_target *target, void *targinfo);
316 /* Called when userspace align differs from kernel space one */
317 void (*compat_from_user)(void *dst, void *src);
318 int (*compat_to_user)(void __user *dst, void *src);
320 /* Set this to THIS_MODULE if you are a module, otherwise NULL */
324 unsigned int targetsize;
325 unsigned int compatsize;
327 unsigned short proto;
329 unsigned short family;
333 /* Furniture shopping... */
336 struct list_head list;
338 /* A unique name... */
339 const char name[XT_TABLE_MAXNAMELEN];
341 /* What hooks you will enter on */
342 unsigned int valid_hooks;
344 /* Lock for the curtain */
347 /* Man behind the curtain... */
348 //struct ip6t_table_info *private;
351 /* Set this to THIS_MODULE if you are a module, otherwise NULL */
354 u_int8_t af; /* address/protocol family */
357 #include <linux/netfilter_ipv4.h>
359 /* The table itself */
364 /* Number of entries: FIXME. --RR */
366 /* Initial number of entries. Needed for module usage count */
367 unsigned int initial_entries;
369 /* Entry points and underflows */
370 unsigned int hook_entry[NF_INET_NUMHOOKS];
371 unsigned int underflow[NF_INET_NUMHOOKS];
373 /* ipt_entry tables: one per CPU */
374 /* Note : this field MUST be the last one, see XT_TABLE_INFO_SZ */
378 #define XT_TABLE_INFO_SZ (offsetof(struct xt_table_info, entries) \
379 + nr_cpu_ids * sizeof(char *))
380 extern int xt_register_target(struct xt_target *target);
381 extern void xt_unregister_target(struct xt_target *target);
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);
385 extern int xt_register_match(struct xt_match *target);
386 extern void xt_unregister_match(struct xt_match *target);
387 extern int xt_register_matches(struct xt_match *match, unsigned int n);
388 extern void xt_unregister_matches(struct xt_match *match, unsigned int n);
390 extern int xt_check_match(struct xt_mtchk_param *, u_int8_t family,
391 unsigned int size, u_int8_t proto, bool inv_proto);
392 extern int xt_check_target(struct xt_tgchk_param *, u_int8_t family,
393 unsigned int size, u_int8_t proto, bool inv_proto);
395 extern struct xt_table *xt_register_table(struct net *net,
396 struct xt_table *table,
397 struct xt_table_info *bootstrap,
398 struct xt_table_info *newinfo);
399 extern void *xt_unregister_table(struct xt_table *table);
401 extern struct xt_table_info *xt_replace_table(struct xt_table *table,
402 unsigned int num_counters,
403 struct xt_table_info *newinfo,
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,
410 extern int xt_find_revision(u8 af, const char *name, u8 revision,
411 int target, int *err);
413 extern struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af,
415 extern void xt_table_unlock(struct xt_table *t);
417 extern int xt_proto_init(struct net *net, u_int8_t af);
418 extern void xt_proto_fini(struct net *net, u_int8_t af);
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);
424 #include <net/compat.h>
426 struct compat_xt_entry_match
430 u_int16_t match_size;
431 char name[XT_FUNCTION_MAXNAMELEN - 1];
435 u_int16_t match_size;
438 u_int16_t match_size;
440 unsigned char data[0];
443 struct compat_xt_entry_target
447 u_int16_t target_size;
448 char name[XT_FUNCTION_MAXNAMELEN - 1];
452 u_int16_t target_size;
453 compat_uptr_t target;
455 u_int16_t target_size;
457 unsigned char data[0];
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 */
464 struct compat_xt_counters
466 #if defined(CONFIG_X86_64) || defined(CONFIG_IA64)
473 struct compat_xt_counters_info
475 char name[XT_TABLE_MAXNAMELEN];
476 compat_uint_t num_counters;
477 struct compat_xt_counters counters[0];
480 #define COMPAT_XT_ALIGN(s) (((s) + (__alignof__(struct compat_xt_counters)-1)) \
481 & ~(__alignof__(struct compat_xt_counters)-1))
483 extern void xt_compat_lock(u_int8_t af);
484 extern void xt_compat_unlock(u_int8_t af);
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);
490 extern int xt_compat_match_offset(const struct xt_match *match);
491 extern int xt_compat_match_from_user(struct xt_entry_match *m,
492 void **dstptr, unsigned int *size);
493 extern int xt_compat_match_to_user(struct xt_entry_match *m,
494 void __user **dstptr, unsigned int *size);
496 extern int xt_compat_target_offset(const struct xt_target *target);
497 extern void xt_compat_target_from_user(struct xt_entry_target *t,
498 void **dstptr, unsigned int *size);
499 extern int xt_compat_target_to_user(struct xt_entry_target *t,
500 void __user **dstptr, unsigned int *size);
502 #endif /* CONFIG_COMPAT */
503 #endif /* __KERNEL__ */
505 #endif /* _X_TABLES_H */