1#ifndef _X_TABLES_H
2#define _X_TABLES_H
3
4
5#include <linux/netdevice.h>
6#include <uapi/linux/netfilter/x_tables.h>
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28struct xt_action_param {
29 union {
30 const struct xt_match *match;
31 const struct xt_target *target;
32 };
33 union {
34 const void *matchinfo, *targinfo;
35 };
36 const struct net_device *in, *out;
37 int fragoff;
38 unsigned int thoff;
39 unsigned int hooknum;
40 u_int8_t family;
41 bool hotdrop;
42};
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57struct xt_mtchk_param {
58 struct net *net;
59 const char *table;
60 const void *entryinfo;
61 const struct xt_match *match;
62 void *matchinfo;
63 unsigned int hook_mask;
64 u_int8_t family;
65};
66
67
68
69
70
71struct xt_mtdtor_param {
72 struct net *net;
73 const struct xt_match *match;
74 void *matchinfo;
75 u_int8_t family;
76};
77
78
79
80
81
82
83
84
85
86
87struct xt_tgchk_param {
88 struct net *net;
89 const char *table;
90 const void *entryinfo;
91 const struct xt_target *target;
92 void *targinfo;
93 unsigned int hook_mask;
94 u_int8_t family;
95};
96
97
98struct xt_tgdtor_param {
99 struct net *net;
100 const struct xt_target *target;
101 void *targinfo;
102 u_int8_t family;
103};
104
105struct xt_match {
106 struct list_head list;
107
108 const char name[XT_EXTENSION_MAXNAMELEN];
109 u_int8_t revision;
110
111
112
113
114
115
116 bool (*match)(const struct sk_buff *skb,
117 struct xt_action_param *);
118
119
120 int (*checkentry)(const struct xt_mtchk_param *);
121
122
123 void (*destroy)(const struct xt_mtdtor_param *);
124#ifdef CONFIG_COMPAT
125
126 void (*compat_from_user)(void *dst, const void *src);
127 int (*compat_to_user)(void __user *dst, const void *src);
128#endif
129
130 struct module *me;
131
132 const char *table;
133 unsigned int matchsize;
134#ifdef CONFIG_COMPAT
135 unsigned int compatsize;
136#endif
137 unsigned int hooks;
138 unsigned short proto;
139
140 unsigned short family;
141};
142
143
144struct xt_target {
145 struct list_head list;
146
147 const char name[XT_EXTENSION_MAXNAMELEN];
148 u_int8_t revision;
149
150
151
152
153 unsigned int (*target)(struct sk_buff *skb,
154 const struct xt_action_param *);
155
156
157
158
159
160 int (*checkentry)(const struct xt_tgchk_param *);
161
162
163 void (*destroy)(const struct xt_tgdtor_param *);
164#ifdef CONFIG_COMPAT
165
166 void (*compat_from_user)(void *dst, const void *src);
167 int (*compat_to_user)(void __user *dst, const void *src);
168#endif
169
170 struct module *me;
171
172 const char *table;
173 unsigned int targetsize;
174#ifdef CONFIG_COMPAT
175 unsigned int compatsize;
176#endif
177 unsigned int hooks;
178 unsigned short proto;
179
180 unsigned short family;
181};
182
183
184struct xt_table {
185 struct list_head list;
186
187
188 unsigned int valid_hooks;
189
190
191 struct xt_table_info *private;
192
193
194 struct module *me;
195
196 u_int8_t af;
197 int priority;
198
199
200 const char name[XT_TABLE_MAXNAMELEN];
201};
202
203#include <linux/netfilter_ipv4.h>
204
205
206struct xt_table_info {
207
208 unsigned int size;
209
210 unsigned int number;
211
212 unsigned int initial_entries;
213
214
215 unsigned int hook_entry[NF_INET_NUMHOOKS];
216 unsigned int underflow[NF_INET_NUMHOOKS];
217
218
219
220
221
222 unsigned int stacksize;
223 unsigned int __percpu *stackptr;
224 void ***jumpstack;
225
226
227 void *entries[1];
228};
229
230#define XT_TABLE_INFO_SZ (offsetof(struct xt_table_info, entries) \
231 + nr_cpu_ids * sizeof(char *))
232extern int xt_register_target(struct xt_target *target);
233extern void xt_unregister_target(struct xt_target *target);
234extern int xt_register_targets(struct xt_target *target, unsigned int n);
235extern void xt_unregister_targets(struct xt_target *target, unsigned int n);
236
237extern int xt_register_match(struct xt_match *target);
238extern void xt_unregister_match(struct xt_match *target);
239extern int xt_register_matches(struct xt_match *match, unsigned int n);
240extern void xt_unregister_matches(struct xt_match *match, unsigned int n);
241
242extern int xt_check_match(struct xt_mtchk_param *,
243 unsigned int size, u_int8_t proto, bool inv_proto);
244extern int xt_check_target(struct xt_tgchk_param *,
245 unsigned int size, u_int8_t proto, bool inv_proto);
246
247extern struct xt_table *xt_register_table(struct net *net,
248 const struct xt_table *table,
249 struct xt_table_info *bootstrap,
250 struct xt_table_info *newinfo);
251extern void *xt_unregister_table(struct xt_table *table);
252
253extern struct xt_table_info *xt_replace_table(struct xt_table *table,
254 unsigned int num_counters,
255 struct xt_table_info *newinfo,
256 int *error);
257
258extern struct xt_match *xt_find_match(u8 af, const char *name, u8 revision);
259extern struct xt_target *xt_find_target(u8 af, const char *name, u8 revision);
260extern struct xt_match *xt_request_find_match(u8 af, const char *name,
261 u8 revision);
262extern struct xt_target *xt_request_find_target(u8 af, const char *name,
263 u8 revision);
264extern int xt_find_revision(u8 af, const char *name, u8 revision,
265 int target, int *err);
266
267extern struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af,
268 const char *name);
269extern void xt_table_unlock(struct xt_table *t);
270
271extern int xt_proto_init(struct net *net, u_int8_t af);
272extern void xt_proto_fini(struct net *net, u_int8_t af);
273
274extern struct xt_table_info *xt_alloc_table_info(unsigned int size);
275extern void xt_free_table_info(struct xt_table_info *info);
276
277
278
279
280
281
282
283
284
285DECLARE_PER_CPU(seqcount_t, xt_recseq);
286
287
288
289
290
291
292
293
294
295
296
297static inline unsigned int xt_write_recseq_begin(void)
298{
299 unsigned int addend;
300
301
302
303
304
305 addend = (__this_cpu_read(xt_recseq.sequence) + 1) & 1;
306
307
308
309
310
311
312 __this_cpu_add(xt_recseq.sequence, addend);
313 smp_wmb();
314
315 return addend;
316}
317
318
319
320
321
322
323
324
325
326static inline void xt_write_recseq_end(unsigned int addend)
327{
328
329 smp_wmb();
330 __this_cpu_add(xt_recseq.sequence, addend);
331}
332
333
334
335
336static inline unsigned long ifname_compare_aligned(const char *_a,
337 const char *_b,
338 const char *_mask)
339{
340 const unsigned long *a = (const unsigned long *)_a;
341 const unsigned long *b = (const unsigned long *)_b;
342 const unsigned long *mask = (const unsigned long *)_mask;
343 unsigned long ret;
344
345 ret = (a[0] ^ b[0]) & mask[0];
346 if (IFNAMSIZ > sizeof(unsigned long))
347 ret |= (a[1] ^ b[1]) & mask[1];
348 if (IFNAMSIZ > 2 * sizeof(unsigned long))
349 ret |= (a[2] ^ b[2]) & mask[2];
350 if (IFNAMSIZ > 3 * sizeof(unsigned long))
351 ret |= (a[3] ^ b[3]) & mask[3];
352 BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long));
353 return ret;
354}
355
356extern struct nf_hook_ops *xt_hook_link(const struct xt_table *, nf_hookfn *);
357extern void xt_hook_unlink(const struct xt_table *, struct nf_hook_ops *);
358
359#ifdef CONFIG_COMPAT
360#include <net/compat.h>
361
362struct compat_xt_entry_match {
363 union {
364 struct {
365 u_int16_t match_size;
366 char name[XT_FUNCTION_MAXNAMELEN - 1];
367 u_int8_t revision;
368 } user;
369 struct {
370 u_int16_t match_size;
371 compat_uptr_t match;
372 } kernel;
373 u_int16_t match_size;
374 } u;
375 unsigned char data[0];
376};
377
378struct compat_xt_entry_target {
379 union {
380 struct {
381 u_int16_t target_size;
382 char name[XT_FUNCTION_MAXNAMELEN - 1];
383 u_int8_t revision;
384 } user;
385 struct {
386 u_int16_t target_size;
387 compat_uptr_t target;
388 } kernel;
389 u_int16_t target_size;
390 } u;
391 unsigned char data[0];
392};
393
394
395
396
397
398struct compat_xt_counters {
399 compat_u64 pcnt, bcnt;
400};
401
402struct compat_xt_counters_info {
403 char name[XT_TABLE_MAXNAMELEN];
404 compat_uint_t num_counters;
405 struct compat_xt_counters counters[0];
406};
407
408struct _compat_xt_align {
409 __u8 u8;
410 __u16 u16;
411 __u32 u32;
412 compat_u64 u64;
413};
414
415#define COMPAT_XT_ALIGN(s) __ALIGN_KERNEL((s), __alignof__(struct _compat_xt_align))
416
417extern void xt_compat_lock(u_int8_t af);
418extern void xt_compat_unlock(u_int8_t af);
419
420extern int xt_compat_add_offset(u_int8_t af, unsigned int offset, int delta);
421extern void xt_compat_flush_offsets(u_int8_t af);
422extern void xt_compat_init_offsets(u_int8_t af, unsigned int number);
423extern int xt_compat_calc_jump(u_int8_t af, unsigned int offset);
424
425extern int xt_compat_match_offset(const struct xt_match *match);
426extern int xt_compat_match_from_user(struct xt_entry_match *m,
427 void **dstptr, unsigned int *size);
428extern int xt_compat_match_to_user(const struct xt_entry_match *m,
429 void __user **dstptr, unsigned int *size);
430
431extern int xt_compat_target_offset(const struct xt_target *target);
432extern void xt_compat_target_from_user(struct xt_entry_target *t,
433 void **dstptr, unsigned int *size);
434extern int xt_compat_target_to_user(const struct xt_entry_target *t,
435 void __user **dstptr, unsigned int *size);
436
437#endif
438#endif
439