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2e4e6a17 HW |
1 | #ifndef _X_TABLES_H |
2 | #define _X_TABLES_H | |
3 | ||
60c195c7 AB |
4 | #include <linux/types.h> |
5 | ||
2e4e6a17 HW |
6 | #define XT_FUNCTION_MAXNAMELEN 30 |
7 | #define XT_TABLE_MAXNAMELEN 32 | |
8 | ||
d94d9fee | 9 | struct xt_entry_match { |
1e30a014 DM |
10 | union { |
11 | struct { | |
60c195c7 | 12 | __u16 match_size; |
1e30a014 DM |
13 | |
14 | /* Used by userspace */ | |
15 | char name[XT_FUNCTION_MAXNAMELEN-1]; | |
16 | ||
60c195c7 | 17 | __u8 revision; |
1e30a014 DM |
18 | } user; |
19 | struct { | |
60c195c7 | 20 | __u16 match_size; |
1e30a014 DM |
21 | |
22 | /* Used inside the kernel */ | |
23 | struct xt_match *match; | |
24 | } kernel; | |
25 | ||
26 | /* Total length */ | |
60c195c7 | 27 | __u16 match_size; |
1e30a014 DM |
28 | } u; |
29 | ||
30 | unsigned char data[0]; | |
31 | }; | |
32 | ||
d94d9fee | 33 | struct xt_entry_target { |
1e30a014 DM |
34 | union { |
35 | struct { | |
60c195c7 | 36 | __u16 target_size; |
1e30a014 DM |
37 | |
38 | /* Used by userspace */ | |
39 | char name[XT_FUNCTION_MAXNAMELEN-1]; | |
40 | ||
60c195c7 | 41 | __u8 revision; |
1e30a014 DM |
42 | } user; |
43 | struct { | |
60c195c7 | 44 | __u16 target_size; |
1e30a014 DM |
45 | |
46 | /* Used inside the kernel */ | |
47 | struct xt_target *target; | |
48 | } kernel; | |
49 | ||
50 | /* Total length */ | |
60c195c7 | 51 | __u16 target_size; |
1e30a014 DM |
52 | } u; |
53 | ||
54 | unsigned char data[0]; | |
55 | }; | |
56 | ||
3c2ad469 PM |
57 | #define XT_TARGET_INIT(__name, __size) \ |
58 | { \ | |
59 | .target.u.user = { \ | |
60 | .target_size = XT_ALIGN(__size), \ | |
61 | .name = __name, \ | |
62 | }, \ | |
63 | } | |
64 | ||
d94d9fee | 65 | struct xt_standard_target { |
1e30a014 DM |
66 | struct xt_entry_target target; |
67 | int verdict; | |
68 | }; | |
69 | ||
2e4e6a17 HW |
70 | /* The argument to IPT_SO_GET_REVISION_*. Returns highest revision |
71 | * kernel supports, if >= revision. */ | |
d94d9fee | 72 | struct xt_get_revision { |
2e4e6a17 HW |
73 | char name[XT_FUNCTION_MAXNAMELEN-1]; |
74 | ||
60c195c7 | 75 | __u8 revision; |
2e4e6a17 HW |
76 | }; |
77 | ||
78 | /* CONTINUE verdict for targets */ | |
79 | #define XT_CONTINUE 0xFFFFFFFF | |
80 | ||
81 | /* For standard target */ | |
82 | #define XT_RETURN (-NF_REPEAT - 1) | |
83 | ||
6fbfc968 DM |
84 | /* this is a dummy structure to find out the alignment requirement for a struct |
85 | * containing all the fundamental data types that are used in ipt_entry, | |
86 | * ip6t_entry and arpt_entry. This sucks, and it is a hack. It will be my | |
87 | * personal pleasure to remove it -HW | |
88 | */ | |
d94d9fee | 89 | struct _xt_align { |
60c195c7 AB |
90 | __u8 u8; |
91 | __u16 u16; | |
92 | __u32 u32; | |
93 | __u64 u64; | |
6fbfc968 DM |
94 | }; |
95 | ||
42107f50 | 96 | #define XT_ALIGN(s) ALIGN((s), __alignof__(struct _xt_align)) |
2e4e6a17 HW |
97 | |
98 | /* Standard return verdict, or do jump. */ | |
99 | #define XT_STANDARD_TARGET "" | |
100 | /* Error verdict. */ | |
101 | #define XT_ERROR_TARGET "ERROR" | |
102 | ||
2e4e6a17 HW |
103 | #define SET_COUNTER(c,b,p) do { (c).bcnt = (b); (c).pcnt = (p); } while(0) |
104 | #define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0) | |
105 | ||
d94d9fee | 106 | struct xt_counters { |
60c195c7 | 107 | __u64 pcnt, bcnt; /* Packet and byte counters */ |
2e4e6a17 HW |
108 | }; |
109 | ||
110 | /* The argument to IPT_SO_ADD_COUNTERS. */ | |
d94d9fee | 111 | struct xt_counters_info { |
2e4e6a17 HW |
112 | /* Which table. */ |
113 | char name[XT_TABLE_MAXNAMELEN]; | |
114 | ||
115 | unsigned int num_counters; | |
116 | ||
117 | /* The counters (actually `number' of these). */ | |
118 | struct xt_counters counters[0]; | |
119 | }; | |
120 | ||
121 | #define XT_INV_PROTO 0x40 /* Invert the sense of PROTO. */ | |
122 | ||
dcea992a | 123 | #ifndef __KERNEL__ |
89c002d6 PM |
124 | /* fn returns 0 to continue iteration */ |
125 | #define XT_MATCH_ITERATE(type, e, fn, args...) \ | |
126 | ({ \ | |
127 | unsigned int __i; \ | |
128 | int __ret = 0; \ | |
129 | struct xt_entry_match *__m; \ | |
130 | \ | |
131 | for (__i = sizeof(type); \ | |
132 | __i < (e)->target_offset; \ | |
133 | __i += __m->u.match_size) { \ | |
134 | __m = (void *)e + __i; \ | |
135 | \ | |
136 | __ret = fn(__m , ## args); \ | |
137 | if (__ret != 0) \ | |
138 | break; \ | |
139 | } \ | |
140 | __ret; \ | |
141 | }) | |
142 | ||
143 | /* fn returns 0 to continue iteration */ | |
144 | #define XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \ | |
145 | ({ \ | |
146 | unsigned int __i, __n; \ | |
147 | int __ret = 0; \ | |
148 | type *__entry; \ | |
149 | \ | |
150 | for (__i = 0, __n = 0; __i < (size); \ | |
151 | __i += __entry->next_offset, __n++) { \ | |
152 | __entry = (void *)(entries) + __i; \ | |
153 | if (__n < n) \ | |
154 | continue; \ | |
155 | \ | |
156 | __ret = fn(__entry , ## args); \ | |
157 | if (__ret != 0) \ | |
158 | break; \ | |
159 | } \ | |
160 | __ret; \ | |
161 | }) | |
162 | ||
163 | /* fn returns 0 to continue iteration */ | |
164 | #define XT_ENTRY_ITERATE(type, entries, size, fn, args...) \ | |
165 | XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args) | |
166 | ||
72b2b1dd JE |
167 | #endif /* !__KERNEL__ */ |
168 | ||
169 | /* pos is normally a struct ipt_entry/ip6t_entry/etc. */ | |
170 | #define xt_entry_foreach(pos, ehead, esize) \ | |
171 | for ((pos) = (typeof(pos))(ehead); \ | |
172 | (pos) < (typeof(pos))((char *)(ehead) + (esize)); \ | |
173 | (pos) = (typeof(pos))((char *)(pos) + (pos)->next_offset)) | |
174 | ||
dcea992a JE |
175 | /* can only be xt_entry_match, so no use of typeof here */ |
176 | #define xt_ematch_foreach(pos, entry) \ | |
177 | for ((pos) = (struct xt_entry_match *)entry->elems; \ | |
178 | (pos) < (struct xt_entry_match *)((char *)(entry) + \ | |
179 | (entry)->target_offset); \ | |
180 | (pos) = (struct xt_entry_match *)((char *)(pos) + \ | |
181 | (pos)->u.match_size)) | |
182 | ||
2e4e6a17 HW |
183 | #ifdef __KERNEL__ |
184 | ||
185 | #include <linux/netdevice.h> | |
186 | ||
f7108a20 JE |
187 | /** |
188 | * struct xt_match_param - parameters for match extensions' match functions | |
189 | * | |
190 | * @in: input netdevice | |
191 | * @out: output netdevice | |
192 | * @match: struct xt_match through which this function was invoked | |
193 | * @matchinfo: per-match data | |
194 | * @fragoff: packet is a fragment, this is the data offset | |
195 | * @thoff: position of transport header relative to skb->data | |
a5e78820 | 196 | * @hook: hook number given packet came from |
916a917d JE |
197 | * @family: Actual NFPROTO_* through which the function is invoked |
198 | * (helpful when match->family == NFPROTO_UNSPEC) | |
a5e78820 | 199 | * @hotdrop: drop packet if we had inspection problems |
16599786 | 200 | * Network namespace obtainable using dev_net(in/out) |
f7108a20 JE |
201 | */ |
202 | struct xt_match_param { | |
203 | const struct net_device *in, *out; | |
204 | const struct xt_match *match; | |
205 | const void *matchinfo; | |
206 | int fragoff; | |
207 | unsigned int thoff; | |
a5e78820 | 208 | unsigned int hooknum; |
916a917d | 209 | u_int8_t family; |
a5e78820 | 210 | bool *hotdrop; |
f7108a20 JE |
211 | }; |
212 | ||
9b4fce7a JE |
213 | /** |
214 | * struct xt_mtchk_param - parameters for match extensions' | |
215 | * checkentry functions | |
216 | * | |
16599786 | 217 | * @net: network namespace through which the check was invoked |
9b4fce7a JE |
218 | * @table: table the rule is tried to be inserted into |
219 | * @entryinfo: the family-specific rule data | |
16599786 | 220 | * (struct ipt_ip, ip6t_ip, arpt_arp or (note) ebt_entry) |
9b4fce7a JE |
221 | * @match: struct xt_match through which this function was invoked |
222 | * @matchinfo: per-match data | |
223 | * @hook_mask: via which hooks the new rule is reachable | |
16599786 | 224 | * Other fields as above. |
9b4fce7a JE |
225 | */ |
226 | struct xt_mtchk_param { | |
a83d8e8d | 227 | struct net *net; |
9b4fce7a JE |
228 | const char *table; |
229 | const void *entryinfo; | |
230 | const struct xt_match *match; | |
231 | void *matchinfo; | |
232 | unsigned int hook_mask; | |
916a917d | 233 | u_int8_t family; |
9b4fce7a JE |
234 | }; |
235 | ||
16599786 JE |
236 | /** |
237 | * struct xt_mdtor_param - match destructor parameters | |
238 | * Fields as above. | |
239 | */ | |
6be3d859 | 240 | struct xt_mtdtor_param { |
f54e9367 | 241 | struct net *net; |
6be3d859 JE |
242 | const struct xt_match *match; |
243 | void *matchinfo; | |
916a917d | 244 | u_int8_t family; |
6be3d859 JE |
245 | }; |
246 | ||
7eb35586 JE |
247 | /** |
248 | * struct xt_target_param - parameters for target extensions' target functions | |
249 | * | |
250 | * @hooknum: hook through which this target was invoked | |
251 | * @target: struct xt_target through which this function was invoked | |
252 | * @targinfo: per-target data | |
253 | * | |
254 | * Other fields see above. | |
255 | */ | |
256 | struct xt_target_param { | |
257 | const struct net_device *in, *out; | |
7eb35586 JE |
258 | const struct xt_target *target; |
259 | const void *targinfo; | |
98d89b41 | 260 | unsigned int hooknum; |
916a917d | 261 | u_int8_t family; |
7eb35586 JE |
262 | }; |
263 | ||
af5d6dc2 JE |
264 | /** |
265 | * struct xt_tgchk_param - parameters for target extensions' | |
266 | * checkentry functions | |
267 | * | |
268 | * @entryinfo: the family-specific rule data | |
269 | * (struct ipt_entry, ip6t_entry, arpt_entry, ebt_entry) | |
270 | * | |
271 | * Other fields see above. | |
272 | */ | |
273 | struct xt_tgchk_param { | |
add67461 | 274 | struct net *net; |
af5d6dc2 | 275 | const char *table; |
f79fca55 | 276 | const void *entryinfo; |
af5d6dc2 JE |
277 | const struct xt_target *target; |
278 | void *targinfo; | |
279 | unsigned int hook_mask; | |
916a917d | 280 | u_int8_t family; |
af5d6dc2 JE |
281 | }; |
282 | ||
a2df1648 JE |
283 | /* Target destructor parameters */ |
284 | struct xt_tgdtor_param { | |
add67461 | 285 | struct net *net; |
a2df1648 JE |
286 | const struct xt_target *target; |
287 | void *targinfo; | |
916a917d | 288 | u_int8_t family; |
a2df1648 JE |
289 | }; |
290 | ||
d94d9fee | 291 | struct xt_match { |
2e4e6a17 HW |
292 | struct list_head list; |
293 | ||
294 | const char name[XT_FUNCTION_MAXNAMELEN-1]; | |
daaf83d2 | 295 | u_int8_t revision; |
2e4e6a17 | 296 | |
2e4e6a17 HW |
297 | /* Return true or false: return FALSE and set *hotdrop = 1 to |
298 | force immediate packet drop. */ | |
299 | /* Arguments changed since 2.6.9, as this must now handle | |
300 | non-linear skb, using skb_header_pointer and | |
301 | skb_ip_make_writable. */ | |
1d93a9cb | 302 | bool (*match)(const struct sk_buff *skb, |
f7108a20 | 303 | const struct xt_match_param *); |
2e4e6a17 HW |
304 | |
305 | /* Called when user tries to insert an entry of this type. */ | |
9b4fce7a | 306 | bool (*checkentry)(const struct xt_mtchk_param *); |
2e4e6a17 HW |
307 | |
308 | /* Called when entry of this type deleted. */ | |
6be3d859 | 309 | void (*destroy)(const struct xt_mtdtor_param *); |
c30f540b | 310 | #ifdef CONFIG_COMPAT |
2722971c | 311 | /* Called when userspace align differs from kernel space one */ |
739674fb JE |
312 | void (*compat_from_user)(void *dst, const void *src); |
313 | int (*compat_to_user)(void __user *dst, const void *src); | |
c30f540b | 314 | #endif |
2e4e6a17 HW |
315 | /* Set this to THIS_MODULE if you are a module, otherwise NULL */ |
316 | struct module *me; | |
37f9f733 | 317 | |
ecb6f85e | 318 | const char *table; |
37f9f733 | 319 | unsigned int matchsize; |
c30f540b | 320 | #ifdef CONFIG_COMPAT |
9fa492cd | 321 | unsigned int compatsize; |
c30f540b | 322 | #endif |
37f9f733 PM |
323 | unsigned int hooks; |
324 | unsigned short proto; | |
c4b88513 PM |
325 | |
326 | unsigned short family; | |
2e4e6a17 HW |
327 | }; |
328 | ||
329 | /* Registration hooks for targets. */ | |
d94d9fee | 330 | struct xt_target { |
2e4e6a17 HW |
331 | struct list_head list; |
332 | ||
333 | const char name[XT_FUNCTION_MAXNAMELEN-1]; | |
334 | ||
2e4e6a17 HW |
335 | /* Returns verdict. Argument order changed since 2.6.9, as this |
336 | must now handle non-linear skbs, using skb_copy_bits and | |
337 | skb_ip_make_writable. */ | |
3db05fea | 338 | unsigned int (*target)(struct sk_buff *skb, |
7eb35586 | 339 | const struct xt_target_param *); |
2e4e6a17 HW |
340 | |
341 | /* Called when user tries to insert an entry of this type: | |
342 | hook_mask is a bitmask of hooks from which it can be | |
343 | called. */ | |
344 | /* Should return true or false. */ | |
af5d6dc2 | 345 | bool (*checkentry)(const struct xt_tgchk_param *); |
2e4e6a17 HW |
346 | |
347 | /* Called when entry of this type deleted. */ | |
a2df1648 | 348 | void (*destroy)(const struct xt_tgdtor_param *); |
c30f540b | 349 | #ifdef CONFIG_COMPAT |
2722971c | 350 | /* Called when userspace align differs from kernel space one */ |
739674fb JE |
351 | void (*compat_from_user)(void *dst, const void *src); |
352 | int (*compat_to_user)(void __user *dst, const void *src); | |
c30f540b | 353 | #endif |
2e4e6a17 HW |
354 | /* Set this to THIS_MODULE if you are a module, otherwise NULL */ |
355 | struct module *me; | |
37f9f733 | 356 | |
ecb6f85e | 357 | const char *table; |
37f9f733 | 358 | unsigned int targetsize; |
c30f540b | 359 | #ifdef CONFIG_COMPAT |
9fa492cd | 360 | unsigned int compatsize; |
c30f540b | 361 | #endif |
37f9f733 PM |
362 | unsigned int hooks; |
363 | unsigned short proto; | |
c4b88513 PM |
364 | |
365 | unsigned short family; | |
37f9f733 | 366 | u_int8_t revision; |
2e4e6a17 HW |
367 | }; |
368 | ||
369 | /* Furniture shopping... */ | |
d94d9fee | 370 | struct xt_table { |
2e4e6a17 HW |
371 | struct list_head list; |
372 | ||
2e4e6a17 HW |
373 | /* What hooks you will enter on */ |
374 | unsigned int valid_hooks; | |
375 | ||
2e4e6a17 | 376 | /* Man behind the curtain... */ |
4a2f965c | 377 | struct xt_table_info *private; |
2e4e6a17 HW |
378 | |
379 | /* Set this to THIS_MODULE if you are a module, otherwise NULL */ | |
380 | struct module *me; | |
381 | ||
76108cea | 382 | u_int8_t af; /* address/protocol family */ |
2b95efe7 | 383 | int priority; /* hook order */ |
4a2f965c SH |
384 | |
385 | /* A unique name... */ | |
386 | const char name[XT_TABLE_MAXNAMELEN]; | |
2e4e6a17 HW |
387 | }; |
388 | ||
389 | #include <linux/netfilter_ipv4.h> | |
390 | ||
391 | /* The table itself */ | |
d94d9fee | 392 | struct xt_table_info { |
2e4e6a17 HW |
393 | /* Size per table */ |
394 | unsigned int size; | |
395 | /* Number of entries: FIXME. --RR */ | |
396 | unsigned int number; | |
397 | /* Initial number of entries. Needed for module usage count */ | |
398 | unsigned int initial_entries; | |
399 | ||
400 | /* Entry points and underflows */ | |
6e23ae2a PM |
401 | unsigned int hook_entry[NF_INET_NUMHOOKS]; |
402 | unsigned int underflow[NF_INET_NUMHOOKS]; | |
2e4e6a17 HW |
403 | |
404 | /* ipt_entry tables: one per CPU */ | |
259d4e41 | 405 | /* Note : this field MUST be the last one, see XT_TABLE_INFO_SZ */ |
78454473 | 406 | void *entries[1]; |
2e4e6a17 HW |
407 | }; |
408 | ||
259d4e41 ED |
409 | #define XT_TABLE_INFO_SZ (offsetof(struct xt_table_info, entries) \ |
410 | + nr_cpu_ids * sizeof(char *)) | |
a45049c5 PNA |
411 | extern int xt_register_target(struct xt_target *target); |
412 | extern void xt_unregister_target(struct xt_target *target); | |
52d9c42e PM |
413 | extern int xt_register_targets(struct xt_target *target, unsigned int n); |
414 | extern void xt_unregister_targets(struct xt_target *target, unsigned int n); | |
415 | ||
a45049c5 PNA |
416 | extern int xt_register_match(struct xt_match *target); |
417 | extern void xt_unregister_match(struct xt_match *target); | |
52d9c42e PM |
418 | extern int xt_register_matches(struct xt_match *match, unsigned int n); |
419 | extern void xt_unregister_matches(struct xt_match *match, unsigned int n); | |
2e4e6a17 | 420 | |
916a917d | 421 | extern int xt_check_match(struct xt_mtchk_param *, |
9b4fce7a | 422 | unsigned int size, u_int8_t proto, bool inv_proto); |
916a917d | 423 | extern int xt_check_target(struct xt_tgchk_param *, |
af5d6dc2 | 424 | unsigned int size, u_int8_t proto, bool inv_proto); |
37f9f733 | 425 | |
8d870052 | 426 | extern struct xt_table *xt_register_table(struct net *net, |
35aad0ff | 427 | const struct xt_table *table, |
a98da11d AD |
428 | struct xt_table_info *bootstrap, |
429 | struct xt_table_info *newinfo); | |
2e4e6a17 HW |
430 | extern void *xt_unregister_table(struct xt_table *table); |
431 | ||
432 | extern struct xt_table_info *xt_replace_table(struct xt_table *table, | |
433 | unsigned int num_counters, | |
434 | struct xt_table_info *newinfo, | |
435 | int *error); | |
436 | ||
76108cea JE |
437 | extern struct xt_match *xt_find_match(u8 af, const char *name, u8 revision); |
438 | extern struct xt_target *xt_find_target(u8 af, const char *name, u8 revision); | |
439 | extern struct xt_target *xt_request_find_target(u8 af, const char *name, | |
2e4e6a17 | 440 | u8 revision); |
76108cea JE |
441 | extern int xt_find_revision(u8 af, const char *name, u8 revision, |
442 | int target, int *err); | |
2e4e6a17 | 443 | |
76108cea | 444 | extern struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af, |
8d870052 | 445 | const char *name); |
2e4e6a17 HW |
446 | extern void xt_table_unlock(struct xt_table *t); |
447 | ||
76108cea JE |
448 | extern int xt_proto_init(struct net *net, u_int8_t af); |
449 | extern void xt_proto_fini(struct net *net, u_int8_t af); | |
2e4e6a17 HW |
450 | |
451 | extern struct xt_table_info *xt_alloc_table_info(unsigned int size); | |
452 | extern void xt_free_table_info(struct xt_table_info *info); | |
942e4a2b SH |
453 | |
454 | /* | |
455 | * Per-CPU spinlock associated with per-cpu table entries, and | |
456 | * with a counter for the "reading" side that allows a recursive | |
457 | * reader to avoid taking the lock and deadlocking. | |
458 | * | |
459 | * "reading" is used by ip/arp/ip6 tables rule processing which runs per-cpu. | |
460 | * It needs to ensure that the rules are not being changed while the packet | |
461 | * is being processed. In some cases, the read lock will be acquired | |
462 | * twice on the same CPU; this is okay because of the count. | |
463 | * | |
464 | * "writing" is used when reading counters. | |
465 | * During replace any readers that are using the old tables have to complete | |
466 | * before freeing the old table. This is handled by the write locking | |
467 | * necessary for reading the counters. | |
468 | */ | |
469 | struct xt_info_lock { | |
470 | spinlock_t lock; | |
471 | unsigned char readers; | |
472 | }; | |
473 | DECLARE_PER_CPU(struct xt_info_lock, xt_info_locks); | |
474 | ||
475 | /* | |
476 | * Note: we need to ensure that preemption is disabled before acquiring | |
477 | * the per-cpu-variable, so we do it as a two step process rather than | |
478 | * using "spin_lock_bh()". | |
479 | * | |
480 | * We _also_ need to disable bottom half processing before updating our | |
481 | * nesting count, to make sure that the only kind of re-entrancy is this | |
482 | * code being called by itself: since the count+lock is not an atomic | |
483 | * operation, we can allow no races. | |
484 | * | |
485 | * _Only_ that special combination of being per-cpu and never getting | |
486 | * re-entered asynchronously means that the count is safe. | |
487 | */ | |
488 | static inline void xt_info_rdlock_bh(void) | |
489 | { | |
490 | struct xt_info_lock *lock; | |
491 | ||
492 | local_bh_disable(); | |
493 | lock = &__get_cpu_var(xt_info_locks); | |
0f3d042e | 494 | if (likely(!lock->readers++)) |
942e4a2b SH |
495 | spin_lock(&lock->lock); |
496 | } | |
497 | ||
498 | static inline void xt_info_rdunlock_bh(void) | |
499 | { | |
500 | struct xt_info_lock *lock = &__get_cpu_var(xt_info_locks); | |
501 | ||
0f3d042e | 502 | if (likely(!--lock->readers)) |
942e4a2b SH |
503 | spin_unlock(&lock->lock); |
504 | local_bh_enable(); | |
505 | } | |
506 | ||
507 | /* | |
508 | * The "writer" side needs to get exclusive access to the lock, | |
509 | * regardless of readers. This must be called with bottom half | |
510 | * processing (and thus also preemption) disabled. | |
511 | */ | |
512 | static inline void xt_info_wrlock(unsigned int cpu) | |
513 | { | |
514 | spin_lock(&per_cpu(xt_info_locks, cpu).lock); | |
515 | } | |
516 | ||
517 | static inline void xt_info_wrunlock(unsigned int cpu) | |
518 | { | |
519 | spin_unlock(&per_cpu(xt_info_locks, cpu).lock); | |
520 | } | |
2e4e6a17 | 521 | |
b8dfe498 ED |
522 | /* |
523 | * This helper is performance critical and must be inlined | |
524 | */ | |
525 | static inline unsigned long ifname_compare_aligned(const char *_a, | |
526 | const char *_b, | |
527 | const char *_mask) | |
528 | { | |
529 | const unsigned long *a = (const unsigned long *)_a; | |
530 | const unsigned long *b = (const unsigned long *)_b; | |
531 | const unsigned long *mask = (const unsigned long *)_mask; | |
532 | unsigned long ret; | |
533 | ||
534 | ret = (a[0] ^ b[0]) & mask[0]; | |
535 | if (IFNAMSIZ > sizeof(unsigned long)) | |
536 | ret |= (a[1] ^ b[1]) & mask[1]; | |
537 | if (IFNAMSIZ > 2 * sizeof(unsigned long)) | |
538 | ret |= (a[2] ^ b[2]) & mask[2]; | |
539 | if (IFNAMSIZ > 3 * sizeof(unsigned long)) | |
540 | ret |= (a[3] ^ b[3]) & mask[3]; | |
541 | BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long)); | |
542 | return ret; | |
543 | } | |
544 | ||
2b95efe7 JE |
545 | extern struct nf_hook_ops *xt_hook_link(const struct xt_table *, nf_hookfn *); |
546 | extern void xt_hook_unlink(const struct xt_table *, struct nf_hook_ops *); | |
547 | ||
2722971c DM |
548 | #ifdef CONFIG_COMPAT |
549 | #include <net/compat.h> | |
550 | ||
d94d9fee | 551 | struct compat_xt_entry_match { |
2722971c DM |
552 | union { |
553 | struct { | |
554 | u_int16_t match_size; | |
555 | char name[XT_FUNCTION_MAXNAMELEN - 1]; | |
556 | u_int8_t revision; | |
557 | } user; | |
46c5ea3c PM |
558 | struct { |
559 | u_int16_t match_size; | |
560 | compat_uptr_t match; | |
561 | } kernel; | |
2722971c DM |
562 | u_int16_t match_size; |
563 | } u; | |
564 | unsigned char data[0]; | |
565 | }; | |
566 | ||
d94d9fee | 567 | struct compat_xt_entry_target { |
2722971c DM |
568 | union { |
569 | struct { | |
570 | u_int16_t target_size; | |
571 | char name[XT_FUNCTION_MAXNAMELEN - 1]; | |
572 | u_int8_t revision; | |
573 | } user; | |
46c5ea3c PM |
574 | struct { |
575 | u_int16_t target_size; | |
576 | compat_uptr_t target; | |
577 | } kernel; | |
2722971c DM |
578 | u_int16_t target_size; |
579 | } u; | |
580 | unsigned char data[0]; | |
581 | }; | |
582 | ||
583 | /* FIXME: this works only on 32 bit tasks | |
584 | * need to change whole approach in order to calculate align as function of | |
585 | * current task alignment */ | |
586 | ||
d94d9fee | 587 | struct compat_xt_counters { |
0a026046 | 588 | compat_u64 pcnt, bcnt; /* Packet and byte counters */ |
2722971c DM |
589 | }; |
590 | ||
d94d9fee | 591 | struct compat_xt_counters_info { |
2722971c DM |
592 | char name[XT_TABLE_MAXNAMELEN]; |
593 | compat_uint_t num_counters; | |
594 | struct compat_xt_counters counters[0]; | |
595 | }; | |
596 | ||
42107f50 AD |
597 | struct _compat_xt_align { |
598 | __u8 u8; | |
599 | __u16 u16; | |
600 | __u32 u32; | |
601 | compat_u64 u64; | |
602 | }; | |
603 | ||
604 | #define COMPAT_XT_ALIGN(s) ALIGN((s), __alignof__(struct _compat_xt_align)) | |
2722971c | 605 | |
76108cea JE |
606 | extern void xt_compat_lock(u_int8_t af); |
607 | extern void xt_compat_unlock(u_int8_t af); | |
9fa492cd | 608 | |
76108cea JE |
609 | extern int xt_compat_add_offset(u_int8_t af, unsigned int offset, short delta); |
610 | extern void xt_compat_flush_offsets(u_int8_t af); | |
3e5e524f | 611 | extern int xt_compat_calc_jump(u_int8_t af, unsigned int offset); |
b386d9f5 | 612 | |
5452e425 | 613 | extern int xt_compat_match_offset(const struct xt_match *match); |
89566951 | 614 | extern int xt_compat_match_from_user(struct xt_entry_match *m, |
b0a6363c | 615 | void **dstptr, unsigned int *size); |
739674fb | 616 | extern int xt_compat_match_to_user(const struct xt_entry_match *m, |
b0a6363c | 617 | void __user **dstptr, unsigned int *size); |
9fa492cd | 618 | |
5452e425 | 619 | extern int xt_compat_target_offset(const struct xt_target *target); |
9fa492cd | 620 | extern void xt_compat_target_from_user(struct xt_entry_target *t, |
b0a6363c | 621 | void **dstptr, unsigned int *size); |
739674fb | 622 | extern int xt_compat_target_to_user(const struct xt_entry_target *t, |
b0a6363c | 623 | void __user **dstptr, unsigned int *size); |
2722971c DM |
624 | |
625 | #endif /* CONFIG_COMPAT */ | |
2e4e6a17 HW |
626 | #endif /* __KERNEL__ */ |
627 | ||
628 | #endif /* _X_TABLES_H */ |