1#ifndef _X_TABLES_H
2#define _X_TABLES_H
3#include <linux/kernel.h>
4#include <linux/types.h>
5
6#define XT_FUNCTION_MAXNAMELEN 30
7#define XT_EXTENSION_MAXNAMELEN 29
8#define XT_TABLE_MAXNAMELEN 32
9
10struct xt_entry_match {
11 union {
12 struct {
13 __u16 match_size;
14
15
16 char name[XT_EXTENSION_MAXNAMELEN];
17 __u8 revision;
18 } user;
19 struct {
20 __u16 match_size;
21
22
23 struct xt_match *match;
24 } kernel;
25
26
27 __u16 match_size;
28 } u;
29
30 unsigned char data[0];
31};
32
33struct xt_entry_target {
34 union {
35 struct {
36 __u16 target_size;
37
38
39 char name[XT_EXTENSION_MAXNAMELEN];
40 __u8 revision;
41 } user;
42 struct {
43 __u16 target_size;
44
45
46 struct xt_target *target;
47 } kernel;
48
49
50 __u16 target_size;
51 } u;
52
53 unsigned char data[0];
54};
55
56#define XT_TARGET_INIT(__name, __size) \
57{ \
58 .target.u.user = { \
59 .target_size = XT_ALIGN(__size), \
60 .name = __name, \
61 }, \
62}
63
64struct xt_standard_target {
65 struct xt_entry_target target;
66 int verdict;
67};
68
69struct xt_error_target {
70 struct xt_entry_target target;
71 char errorname[XT_FUNCTION_MAXNAMELEN];
72};
73
74
75
76struct xt_get_revision {
77 char name[XT_EXTENSION_MAXNAMELEN];
78 __u8 revision;
79};
80
81
82#define XT_CONTINUE 0xFFFFFFFF
83
84
85#define XT_RETURN (-NF_REPEAT - 1)
86
87
88
89
90
91
92struct _xt_align {
93 __u8 u8;
94 __u16 u16;
95 __u32 u32;
96 __u64 u64;
97};
98
99#define XT_ALIGN(s) __ALIGN_KERNEL((s), __alignof__(struct _xt_align))
100
101
102#define XT_STANDARD_TARGET ""
103
104#define XT_ERROR_TARGET "ERROR"
105
106#define SET_COUNTER(c,b,p) do { (c).bcnt = (b); (c).pcnt = (p); } while(0)
107#define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0)
108
109struct xt_counters {
110 __u64 pcnt, bcnt;
111};
112
113
114struct xt_counters_info {
115
116 char name[XT_TABLE_MAXNAMELEN];
117
118 unsigned int num_counters;
119
120
121 struct xt_counters counters[0];
122};
123
124#define XT_INV_PROTO 0x40
125
126#ifndef __KERNEL__
127
128#define XT_MATCH_ITERATE(type, e, fn, args...) \
129({ \
130 unsigned int __i; \
131 int __ret = 0; \
132 struct xt_entry_match *__m; \
133 \
134 for (__i = sizeof(type); \
135 __i < (e)->target_offset; \
136 __i += __m->u.match_size) { \
137 __m = (void *)e + __i; \
138 \
139 __ret = fn(__m , ## args); \
140 if (__ret != 0) \
141 break; \
142 } \
143 __ret; \
144})
145
146
147#define XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
148({ \
149 unsigned int __i, __n; \
150 int __ret = 0; \
151 type *__entry; \
152 \
153 for (__i = 0, __n = 0; __i < (size); \
154 __i += __entry->next_offset, __n++) { \
155 __entry = (void *)(entries) + __i; \
156 if (__n < n) \
157 continue; \
158 \
159 __ret = fn(__entry , ## args); \
160 if (__ret != 0) \
161 break; \
162 } \
163 __ret; \
164})
165
166
167#define XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
168 XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
169
170#endif
171
172
173#define xt_entry_foreach(pos, ehead, esize) \
174 for ((pos) = (typeof(pos))(ehead); \
175 (pos) < (typeof(pos))((char *)(ehead) + (esize)); \
176 (pos) = (typeof(pos))((char *)(pos) + (pos)->next_offset))
177
178
179#define xt_ematch_foreach(pos, entry) \
180 for ((pos) = (struct xt_entry_match *)entry->elems; \
181 (pos) < (struct xt_entry_match *)((char *)(entry) + \
182 (entry)->target_offset); \
183 (pos) = (struct xt_entry_match *)((char *)(pos) + \
184 (pos)->u.match_size))
185
186#ifdef __KERNEL__
187
188#include <linux/netdevice.h>
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210struct xt_action_param {
211 union {
212 const struct xt_match *match;
213 const struct xt_target *target;
214 };
215 union {
216 const void *matchinfo, *targinfo;
217 };
218 const struct net_device *in, *out;
219 int fragoff;
220 unsigned int thoff;
221 unsigned int hooknum;
222 u_int8_t family;
223 bool hotdrop;
224};
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239struct xt_mtchk_param {
240 struct net *net;
241 const char *table;
242 const void *entryinfo;
243 const struct xt_match *match;
244 void *matchinfo;
245 unsigned int hook_mask;
246 u_int8_t family;
247};
248
249
250
251
252
253struct xt_mtdtor_param {
254 struct net *net;
255 const struct xt_match *match;
256 void *matchinfo;
257 u_int8_t family;
258};
259
260
261
262
263
264
265
266
267
268
269struct xt_tgchk_param {
270 struct net *net;
271 const char *table;
272 const void *entryinfo;
273 const struct xt_target *target;
274 void *targinfo;
275 unsigned int hook_mask;
276 u_int8_t family;
277};
278
279
280struct xt_tgdtor_param {
281 struct net *net;
282 const struct xt_target *target;
283 void *targinfo;
284 u_int8_t family;
285};
286
287struct xt_match {
288 struct list_head list;
289
290 const char name[XT_EXTENSION_MAXNAMELEN];
291 u_int8_t revision;
292
293
294
295
296
297
298 bool (*match)(const struct sk_buff *skb,
299 struct xt_action_param *);
300
301
302 int (*checkentry)(const struct xt_mtchk_param *);
303
304
305 void (*destroy)(const struct xt_mtdtor_param *);
306#ifdef CONFIG_COMPAT
307
308 void (*compat_from_user)(void *dst, const void *src);
309 int (*compat_to_user)(void __user *dst, const void *src);
310#endif
311
312 struct module *me;
313
314 const char *table;
315 unsigned int matchsize;
316#ifdef CONFIG_COMPAT
317 unsigned int compatsize;
318#endif
319 unsigned int hooks;
320 unsigned short proto;
321
322 unsigned short family;
323};
324
325
326struct xt_target {
327 struct list_head list;
328
329 const char name[XT_EXTENSION_MAXNAMELEN];
330 u_int8_t revision;
331
332
333
334
335 unsigned int (*target)(struct sk_buff *skb,
336 const struct xt_action_param *);
337
338
339
340
341
342 int (*checkentry)(const struct xt_tgchk_param *);
343
344
345 void (*destroy)(const struct xt_tgdtor_param *);
346#ifdef CONFIG_COMPAT
347
348 void (*compat_from_user)(void *dst, const void *src);
349 int (*compat_to_user)(void __user *dst, const void *src);
350#endif
351
352 struct module *me;
353
354 const char *table;
355 unsigned int targetsize;
356#ifdef CONFIG_COMPAT
357 unsigned int compatsize;
358#endif
359 unsigned int hooks;
360 unsigned short proto;
361
362 unsigned short family;
363};
364
365
366struct xt_table {
367 struct list_head list;
368
369
370 unsigned int valid_hooks;
371
372
373 struct xt_table_info *private;
374
375
376 struct module *me;
377
378 u_int8_t af;
379 int priority;
380
381
382 const char name[XT_TABLE_MAXNAMELEN];
383};
384
385#include <linux/netfilter_ipv4.h>
386
387
388struct xt_table_info {
389
390 unsigned int size;
391
392 unsigned int number;
393
394 unsigned int initial_entries;
395
396
397 unsigned int hook_entry[NF_INET_NUMHOOKS];
398 unsigned int underflow[NF_INET_NUMHOOKS];
399
400
401
402
403
404 unsigned int stacksize;
405 unsigned int __percpu *stackptr;
406 void ***jumpstack;
407
408
409 void *entries[1];
410};
411
412#define XT_TABLE_INFO_SZ (offsetof(struct xt_table_info, entries) \
413 + nr_cpu_ids * sizeof(char *))
414extern int xt_register_target(struct xt_target *target);
415extern void xt_unregister_target(struct xt_target *target);
416extern int xt_register_targets(struct xt_target *target, unsigned int n);
417extern void xt_unregister_targets(struct xt_target *target, unsigned int n);
418
419extern int xt_register_match(struct xt_match *target);
420extern void xt_unregister_match(struct xt_match *target);
421extern int xt_register_matches(struct xt_match *match, unsigned int n);
422extern void xt_unregister_matches(struct xt_match *match, unsigned int n);
423
424extern int xt_check_match(struct xt_mtchk_param *,
425 unsigned int size, u_int8_t proto, bool inv_proto);
426extern int xt_check_target(struct xt_tgchk_param *,
427 unsigned int size, u_int8_t proto, bool inv_proto);
428
429extern struct xt_table *xt_register_table(struct net *net,
430 const struct xt_table *table,
431 struct xt_table_info *bootstrap,
432 struct xt_table_info *newinfo);
433extern void *xt_unregister_table(struct xt_table *table);
434
435extern struct xt_table_info *xt_replace_table(struct xt_table *table,
436 unsigned int num_counters,
437 struct xt_table_info *newinfo,
438 int *error);
439
440extern struct xt_match *xt_find_match(u8 af, const char *name, u8 revision);
441extern struct xt_target *xt_find_target(u8 af, const char *name, u8 revision);
442extern struct xt_match *xt_request_find_match(u8 af, const char *name,
443 u8 revision);
444extern struct xt_target *xt_request_find_target(u8 af, const char *name,
445 u8 revision);
446extern int xt_find_revision(u8 af, const char *name, u8 revision,
447 int target, int *err);
448
449extern struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af,
450 const char *name);
451extern void xt_table_unlock(struct xt_table *t);
452
453extern int xt_proto_init(struct net *net, u_int8_t af);
454extern void xt_proto_fini(struct net *net, u_int8_t af);
455
456extern struct xt_table_info *xt_alloc_table_info(unsigned int size);
457extern void xt_free_table_info(struct xt_table_info *info);
458
459
460
461
462
463
464
465
466
467DECLARE_PER_CPU(seqcount_t, xt_recseq);
468
469
470
471
472
473
474
475
476
477
478
479static inline unsigned int xt_write_recseq_begin(void)
480{
481 unsigned int addend;
482
483
484
485
486
487 addend = (__this_cpu_read(xt_recseq.sequence) + 1) & 1;
488
489
490
491
492
493
494 __this_cpu_add(xt_recseq.sequence, addend);
495 smp_wmb();
496
497 return addend;
498}
499
500
501
502
503
504
505
506
507
508static inline void xt_write_recseq_end(unsigned int addend)
509{
510
511 smp_wmb();
512 __this_cpu_add(xt_recseq.sequence, addend);
513}
514
515
516
517
518static inline unsigned long ifname_compare_aligned(const char *_a,
519 const char *_b,
520 const char *_mask)
521{
522 const unsigned long *a = (const unsigned long *)_a;
523 const unsigned long *b = (const unsigned long *)_b;
524 const unsigned long *mask = (const unsigned long *)_mask;
525 unsigned long ret;
526
527 ret = (a[0] ^ b[0]) & mask[0];
528 if (IFNAMSIZ > sizeof(unsigned long))
529 ret |= (a[1] ^ b[1]) & mask[1];
530 if (IFNAMSIZ > 2 * sizeof(unsigned long))
531 ret |= (a[2] ^ b[2]) & mask[2];
532 if (IFNAMSIZ > 3 * sizeof(unsigned long))
533 ret |= (a[3] ^ b[3]) & mask[3];
534 BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long));
535 return ret;
536}
537
538extern struct nf_hook_ops *xt_hook_link(const struct xt_table *, nf_hookfn *);
539extern void xt_hook_unlink(const struct xt_table *, struct nf_hook_ops *);
540
541#ifdef CONFIG_COMPAT
542#include <net/compat.h>
543
544struct compat_xt_entry_match {
545 union {
546 struct {
547 u_int16_t match_size;
548 char name[XT_FUNCTION_MAXNAMELEN - 1];
549 u_int8_t revision;
550 } user;
551 struct {
552 u_int16_t match_size;
553 compat_uptr_t match;
554 } kernel;
555 u_int16_t match_size;
556 } u;
557 unsigned char data[0];
558};
559
560struct compat_xt_entry_target {
561 union {
562 struct {
563 u_int16_t target_size;
564 char name[XT_FUNCTION_MAXNAMELEN - 1];
565 u_int8_t revision;
566 } user;
567 struct {
568 u_int16_t target_size;
569 compat_uptr_t target;
570 } kernel;
571 u_int16_t target_size;
572 } u;
573 unsigned char data[0];
574};
575
576
577
578
579
580struct compat_xt_counters {
581 compat_u64 pcnt, bcnt;
582};
583
584struct compat_xt_counters_info {
585 char name[XT_TABLE_MAXNAMELEN];
586 compat_uint_t num_counters;
587 struct compat_xt_counters counters[0];
588};
589
590struct _compat_xt_align {
591 __u8 u8;
592 __u16 u16;
593 __u32 u32;
594 compat_u64 u64;
595};
596
597#define COMPAT_XT_ALIGN(s) __ALIGN_KERNEL((s), __alignof__(struct _compat_xt_align))
598
599extern void xt_compat_lock(u_int8_t af);
600extern void xt_compat_unlock(u_int8_t af);
601
602extern int xt_compat_add_offset(u_int8_t af, unsigned int offset, int delta);
603extern void xt_compat_flush_offsets(u_int8_t af);
604extern void xt_compat_init_offsets(u_int8_t af, unsigned int number);
605extern int xt_compat_calc_jump(u_int8_t af, unsigned int offset);
606
607extern int xt_compat_match_offset(const struct xt_match *match);
608extern int xt_compat_match_from_user(struct xt_entry_match *m,
609 void **dstptr, unsigned int *size);
610extern int xt_compat_match_to_user(const struct xt_entry_match *m,
611 void __user **dstptr, unsigned int *size);
612
613extern int xt_compat_target_offset(const struct xt_target *target);
614extern void xt_compat_target_from_user(struct xt_entry_target *t,
615 void **dstptr, unsigned int *size);
616extern int xt_compat_target_to_user(const struct xt_entry_target *t,
617 void __user **dstptr, unsigned int *size);
618
619#endif
620#endif
621
622#endif
623