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;
217 struct list_head list;
219 const char name[XT_FUNCTION_MAXNAMELEN-1];
221 /* Return true or false: return FALSE and set *hotdrop = 1 to
222 force immediate packet drop. */
223 /* Arguments changed since 2.6.9, as this must now handle
224 non-linear skb, using skb_header_pointer and
225 skb_ip_make_writable. */
226 bool (*match)(const struct sk_buff *skb,
227 const struct xt_match_param *);
229 /* Called when user tries to insert an entry of this type. */
230 bool (*checkentry)(const struct xt_mtchk_param *);
232 /* Called when entry of this type deleted. */
233 void (*destroy)(const struct xt_match *match, void *matchinfo);
235 /* Called when userspace align differs from kernel space one */
236 void (*compat_from_user)(void *dst, void *src);
237 int (*compat_to_user)(void __user *dst, void *src);
239 /* Set this to THIS_MODULE if you are a module, otherwise NULL */
242 /* Free to use by each match */
246 unsigned int matchsize;
247 unsigned int compatsize;
249 unsigned short proto;
251 unsigned short family;
255 /* Registration hooks for targets. */
258 struct list_head list;
260 const char name[XT_FUNCTION_MAXNAMELEN-1];
262 /* Returns verdict. Argument order changed since 2.6.9, as this
263 must now handle non-linear skbs, using skb_copy_bits and
264 skb_ip_make_writable. */
265 unsigned int (*target)(struct sk_buff *skb,
266 const struct net_device *in,
267 const struct net_device *out,
268 unsigned int hooknum,
269 const struct xt_target *target,
270 const void *targinfo);
272 /* Called when user tries to insert an entry of this type:
273 hook_mask is a bitmask of hooks from which it can be
275 /* Should return true or false. */
276 bool (*checkentry)(const char *tablename,
278 const struct xt_target *target,
280 unsigned int hook_mask);
282 /* Called when entry of this type deleted. */
283 void (*destroy)(const struct xt_target *target, void *targinfo);
285 /* Called when userspace align differs from kernel space one */
286 void (*compat_from_user)(void *dst, void *src);
287 int (*compat_to_user)(void __user *dst, void *src);
289 /* Set this to THIS_MODULE if you are a module, otherwise NULL */
293 unsigned int targetsize;
294 unsigned int compatsize;
296 unsigned short proto;
298 unsigned short family;
302 /* Furniture shopping... */
305 struct list_head list;
307 /* A unique name... */
308 const char name[XT_TABLE_MAXNAMELEN];
310 /* What hooks you will enter on */
311 unsigned int valid_hooks;
313 /* Lock for the curtain */
316 /* Man behind the curtain... */
317 //struct ip6t_table_info *private;
320 /* Set this to THIS_MODULE if you are a module, otherwise NULL */
323 u_int8_t af; /* address/protocol family */
326 #include <linux/netfilter_ipv4.h>
328 /* The table itself */
333 /* Number of entries: FIXME. --RR */
335 /* Initial number of entries. Needed for module usage count */
336 unsigned int initial_entries;
338 /* Entry points and underflows */
339 unsigned int hook_entry[NF_INET_NUMHOOKS];
340 unsigned int underflow[NF_INET_NUMHOOKS];
342 /* ipt_entry tables: one per CPU */
343 /* Note : this field MUST be the last one, see XT_TABLE_INFO_SZ */
347 #define XT_TABLE_INFO_SZ (offsetof(struct xt_table_info, entries) \
348 + nr_cpu_ids * sizeof(char *))
349 extern int xt_register_target(struct xt_target *target);
350 extern void xt_unregister_target(struct xt_target *target);
351 extern int xt_register_targets(struct xt_target *target, unsigned int n);
352 extern void xt_unregister_targets(struct xt_target *target, unsigned int n);
354 extern int xt_register_match(struct xt_match *target);
355 extern void xt_unregister_match(struct xt_match *target);
356 extern int xt_register_matches(struct xt_match *match, unsigned int n);
357 extern void xt_unregister_matches(struct xt_match *match, unsigned int n);
359 extern int xt_check_match(struct xt_mtchk_param *, u_int8_t family,
360 unsigned int size, u_int8_t proto, bool inv_proto);
361 extern int xt_check_target(const struct xt_target *target, unsigned short family,
362 unsigned int size, const char *table, unsigned int hook,
363 unsigned short proto, int inv_proto,
364 const void *entry, void *targinfo);
366 extern struct xt_table *xt_register_table(struct net *net,
367 struct xt_table *table,
368 struct xt_table_info *bootstrap,
369 struct xt_table_info *newinfo);
370 extern void *xt_unregister_table(struct xt_table *table);
372 extern struct xt_table_info *xt_replace_table(struct xt_table *table,
373 unsigned int num_counters,
374 struct xt_table_info *newinfo,
377 extern struct xt_match *xt_find_match(u8 af, const char *name, u8 revision);
378 extern struct xt_target *xt_find_target(u8 af, const char *name, u8 revision);
379 extern struct xt_target *xt_request_find_target(u8 af, const char *name,
381 extern int xt_find_revision(u8 af, const char *name, u8 revision,
382 int target, int *err);
384 extern struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af,
386 extern void xt_table_unlock(struct xt_table *t);
388 extern int xt_proto_init(struct net *net, u_int8_t af);
389 extern void xt_proto_fini(struct net *net, u_int8_t af);
391 extern struct xt_table_info *xt_alloc_table_info(unsigned int size);
392 extern void xt_free_table_info(struct xt_table_info *info);
395 #include <net/compat.h>
397 struct compat_xt_entry_match
401 u_int16_t match_size;
402 char name[XT_FUNCTION_MAXNAMELEN - 1];
406 u_int16_t match_size;
409 u_int16_t match_size;
411 unsigned char data[0];
414 struct compat_xt_entry_target
418 u_int16_t target_size;
419 char name[XT_FUNCTION_MAXNAMELEN - 1];
423 u_int16_t target_size;
424 compat_uptr_t target;
426 u_int16_t target_size;
428 unsigned char data[0];
431 /* FIXME: this works only on 32 bit tasks
432 * need to change whole approach in order to calculate align as function of
433 * current task alignment */
435 struct compat_xt_counters
437 #if defined(CONFIG_X86_64) || defined(CONFIG_IA64)
444 struct compat_xt_counters_info
446 char name[XT_TABLE_MAXNAMELEN];
447 compat_uint_t num_counters;
448 struct compat_xt_counters counters[0];
451 #define COMPAT_XT_ALIGN(s) (((s) + (__alignof__(struct compat_xt_counters)-1)) \
452 & ~(__alignof__(struct compat_xt_counters)-1))
454 extern void xt_compat_lock(u_int8_t af);
455 extern void xt_compat_unlock(u_int8_t af);
457 extern int xt_compat_add_offset(u_int8_t af, unsigned int offset, short delta);
458 extern void xt_compat_flush_offsets(u_int8_t af);
459 extern short xt_compat_calc_jump(u_int8_t af, unsigned int offset);
461 extern int xt_compat_match_offset(const struct xt_match *match);
462 extern int xt_compat_match_from_user(struct xt_entry_match *m,
463 void **dstptr, unsigned int *size);
464 extern int xt_compat_match_to_user(struct xt_entry_match *m,
465 void __user **dstptr, unsigned int *size);
467 extern int xt_compat_target_offset(const struct xt_target *target);
468 extern void xt_compat_target_from_user(struct xt_entry_target *t,
469 void **dstptr, unsigned int *size);
470 extern int xt_compat_target_to_user(struct xt_entry_target *t,
471 void __user **dstptr, unsigned int *size);
473 #endif /* CONFIG_COMPAT */
474 #endif /* __KERNEL__ */
476 #endif /* _X_TABLES_H */