Commit | Line | Data |
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2e4e6a17 HW |
1 | /* |
2 | * x_tables core - Backend for {ip,ip6,arp}_tables | |
3 | * | |
4 | * Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org> | |
5 | * | |
6 | * Based on existing ip_tables code which is | |
7 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
8 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | */ | |
15 | ||
2e4e6a17 HW |
16 | #include <linux/kernel.h> |
17 | #include <linux/socket.h> | |
18 | #include <linux/net.h> | |
19 | #include <linux/proc_fs.h> | |
20 | #include <linux/seq_file.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/vmalloc.h> | |
9e19bb6d | 23 | #include <linux/mutex.h> |
d7fe0f24 | 24 | #include <linux/mm.h> |
457c4cbc | 25 | #include <net/net_namespace.h> |
2e4e6a17 HW |
26 | |
27 | #include <linux/netfilter/x_tables.h> | |
28 | #include <linux/netfilter_arp.h> | |
29 | ||
9e19bb6d | 30 | |
2e4e6a17 HW |
31 | MODULE_LICENSE("GPL"); |
32 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
043ef46c | 33 | MODULE_DESCRIPTION("{ip,ip6,arp,eb}_tables backend module"); |
2e4e6a17 HW |
34 | |
35 | #define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1)) | |
36 | ||
b386d9f5 PM |
37 | struct compat_delta { |
38 | struct compat_delta *next; | |
39 | unsigned int offset; | |
40 | short delta; | |
41 | }; | |
42 | ||
2e4e6a17 | 43 | struct xt_af { |
9e19bb6d | 44 | struct mutex mutex; |
2e4e6a17 HW |
45 | struct list_head match; |
46 | struct list_head target; | |
b386d9f5 | 47 | #ifdef CONFIG_COMPAT |
2722971c | 48 | struct mutex compat_mutex; |
b386d9f5 PM |
49 | struct compat_delta *compat_offsets; |
50 | #endif | |
2e4e6a17 HW |
51 | }; |
52 | ||
53 | static struct xt_af *xt; | |
54 | ||
55 | #ifdef DEBUG_IP_FIREWALL_USER | |
56 | #define duprintf(format, args...) printk(format , ## args) | |
57 | #else | |
58 | #define duprintf(format, args...) | |
59 | #endif | |
60 | ||
7e9c6eeb JE |
61 | static const char *const xt_prefix[NFPROTO_NUMPROTO] = { |
62 | [NFPROTO_UNSPEC] = "x", | |
63 | [NFPROTO_IPV4] = "ip", | |
64 | [NFPROTO_ARP] = "arp", | |
65 | [NFPROTO_BRIDGE] = "eb", | |
66 | [NFPROTO_IPV6] = "ip6", | |
37f9f733 PM |
67 | }; |
68 | ||
2e4e6a17 HW |
69 | /* Registration hooks for targets. */ |
70 | int | |
a45049c5 | 71 | xt_register_target(struct xt_target *target) |
2e4e6a17 | 72 | { |
76108cea JE |
73 | u_int8_t af = target->family; |
74 | int ret; | |
2e4e6a17 | 75 | |
9e19bb6d | 76 | ret = mutex_lock_interruptible(&xt[af].mutex); |
2e4e6a17 HW |
77 | if (ret != 0) |
78 | return ret; | |
79 | list_add(&target->list, &xt[af].target); | |
9e19bb6d | 80 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
81 | return ret; |
82 | } | |
83 | EXPORT_SYMBOL(xt_register_target); | |
84 | ||
85 | void | |
a45049c5 | 86 | xt_unregister_target(struct xt_target *target) |
2e4e6a17 | 87 | { |
76108cea | 88 | u_int8_t af = target->family; |
a45049c5 | 89 | |
9e19bb6d | 90 | mutex_lock(&xt[af].mutex); |
df0933dc | 91 | list_del(&target->list); |
9e19bb6d | 92 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
93 | } |
94 | EXPORT_SYMBOL(xt_unregister_target); | |
95 | ||
52d9c42e PM |
96 | int |
97 | xt_register_targets(struct xt_target *target, unsigned int n) | |
98 | { | |
99 | unsigned int i; | |
100 | int err = 0; | |
101 | ||
102 | for (i = 0; i < n; i++) { | |
103 | err = xt_register_target(&target[i]); | |
104 | if (err) | |
105 | goto err; | |
106 | } | |
107 | return err; | |
108 | ||
109 | err: | |
110 | if (i > 0) | |
111 | xt_unregister_targets(target, i); | |
112 | return err; | |
113 | } | |
114 | EXPORT_SYMBOL(xt_register_targets); | |
115 | ||
116 | void | |
117 | xt_unregister_targets(struct xt_target *target, unsigned int n) | |
118 | { | |
119 | unsigned int i; | |
120 | ||
121 | for (i = 0; i < n; i++) | |
122 | xt_unregister_target(&target[i]); | |
123 | } | |
124 | EXPORT_SYMBOL(xt_unregister_targets); | |
125 | ||
2e4e6a17 | 126 | int |
a45049c5 | 127 | xt_register_match(struct xt_match *match) |
2e4e6a17 | 128 | { |
76108cea JE |
129 | u_int8_t af = match->family; |
130 | int ret; | |
2e4e6a17 | 131 | |
9e19bb6d | 132 | ret = mutex_lock_interruptible(&xt[af].mutex); |
2e4e6a17 HW |
133 | if (ret != 0) |
134 | return ret; | |
135 | ||
136 | list_add(&match->list, &xt[af].match); | |
9e19bb6d | 137 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
138 | |
139 | return ret; | |
140 | } | |
141 | EXPORT_SYMBOL(xt_register_match); | |
142 | ||
143 | void | |
a45049c5 | 144 | xt_unregister_match(struct xt_match *match) |
2e4e6a17 | 145 | { |
76108cea | 146 | u_int8_t af = match->family; |
a45049c5 | 147 | |
9e19bb6d | 148 | mutex_lock(&xt[af].mutex); |
df0933dc | 149 | list_del(&match->list); |
9e19bb6d | 150 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
151 | } |
152 | EXPORT_SYMBOL(xt_unregister_match); | |
153 | ||
52d9c42e PM |
154 | int |
155 | xt_register_matches(struct xt_match *match, unsigned int n) | |
156 | { | |
157 | unsigned int i; | |
158 | int err = 0; | |
159 | ||
160 | for (i = 0; i < n; i++) { | |
161 | err = xt_register_match(&match[i]); | |
162 | if (err) | |
163 | goto err; | |
164 | } | |
165 | return err; | |
166 | ||
167 | err: | |
168 | if (i > 0) | |
169 | xt_unregister_matches(match, i); | |
170 | return err; | |
171 | } | |
172 | EXPORT_SYMBOL(xt_register_matches); | |
173 | ||
174 | void | |
175 | xt_unregister_matches(struct xt_match *match, unsigned int n) | |
176 | { | |
177 | unsigned int i; | |
178 | ||
179 | for (i = 0; i < n; i++) | |
180 | xt_unregister_match(&match[i]); | |
181 | } | |
182 | EXPORT_SYMBOL(xt_unregister_matches); | |
183 | ||
2e4e6a17 HW |
184 | |
185 | /* | |
186 | * These are weird, but module loading must not be done with mutex | |
187 | * held (since they will register), and we have to have a single | |
188 | * function to use try_then_request_module(). | |
189 | */ | |
190 | ||
191 | /* Find match, grabs ref. Returns ERR_PTR() on error. */ | |
76108cea | 192 | struct xt_match *xt_find_match(u8 af, const char *name, u8 revision) |
2e4e6a17 HW |
193 | { |
194 | struct xt_match *m; | |
195 | int err = 0; | |
196 | ||
9e19bb6d | 197 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
2e4e6a17 HW |
198 | return ERR_PTR(-EINTR); |
199 | ||
200 | list_for_each_entry(m, &xt[af].match, list) { | |
201 | if (strcmp(m->name, name) == 0) { | |
202 | if (m->revision == revision) { | |
203 | if (try_module_get(m->me)) { | |
9e19bb6d | 204 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
205 | return m; |
206 | } | |
207 | } else | |
208 | err = -EPROTOTYPE; /* Found something. */ | |
209 | } | |
210 | } | |
9e19bb6d | 211 | mutex_unlock(&xt[af].mutex); |
55b69e91 JE |
212 | |
213 | if (af != NFPROTO_UNSPEC) | |
214 | /* Try searching again in the family-independent list */ | |
215 | return xt_find_match(NFPROTO_UNSPEC, name, revision); | |
216 | ||
2e4e6a17 HW |
217 | return ERR_PTR(err); |
218 | } | |
219 | EXPORT_SYMBOL(xt_find_match); | |
220 | ||
221 | /* Find target, grabs ref. Returns ERR_PTR() on error. */ | |
76108cea | 222 | struct xt_target *xt_find_target(u8 af, const char *name, u8 revision) |
2e4e6a17 HW |
223 | { |
224 | struct xt_target *t; | |
225 | int err = 0; | |
226 | ||
9e19bb6d | 227 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
2e4e6a17 HW |
228 | return ERR_PTR(-EINTR); |
229 | ||
230 | list_for_each_entry(t, &xt[af].target, list) { | |
231 | if (strcmp(t->name, name) == 0) { | |
232 | if (t->revision == revision) { | |
233 | if (try_module_get(t->me)) { | |
9e19bb6d | 234 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
235 | return t; |
236 | } | |
237 | } else | |
238 | err = -EPROTOTYPE; /* Found something. */ | |
239 | } | |
240 | } | |
9e19bb6d | 241 | mutex_unlock(&xt[af].mutex); |
55b69e91 JE |
242 | |
243 | if (af != NFPROTO_UNSPEC) | |
244 | /* Try searching again in the family-independent list */ | |
245 | return xt_find_target(NFPROTO_UNSPEC, name, revision); | |
246 | ||
2e4e6a17 HW |
247 | return ERR_PTR(err); |
248 | } | |
249 | EXPORT_SYMBOL(xt_find_target); | |
250 | ||
76108cea | 251 | struct xt_target *xt_request_find_target(u8 af, const char *name, u8 revision) |
2e4e6a17 HW |
252 | { |
253 | struct xt_target *target; | |
254 | ||
255 | target = try_then_request_module(xt_find_target(af, name, revision), | |
37f9f733 | 256 | "%st_%s", xt_prefix[af], name); |
2e4e6a17 HW |
257 | if (IS_ERR(target) || !target) |
258 | return NULL; | |
259 | return target; | |
260 | } | |
261 | EXPORT_SYMBOL_GPL(xt_request_find_target); | |
262 | ||
76108cea | 263 | static int match_revfn(u8 af, const char *name, u8 revision, int *bestp) |
2e4e6a17 | 264 | { |
5452e425 | 265 | const struct xt_match *m; |
2e4e6a17 HW |
266 | int have_rev = 0; |
267 | ||
268 | list_for_each_entry(m, &xt[af].match, list) { | |
269 | if (strcmp(m->name, name) == 0) { | |
270 | if (m->revision > *bestp) | |
271 | *bestp = m->revision; | |
272 | if (m->revision == revision) | |
273 | have_rev = 1; | |
274 | } | |
275 | } | |
276 | return have_rev; | |
277 | } | |
278 | ||
76108cea | 279 | static int target_revfn(u8 af, const char *name, u8 revision, int *bestp) |
2e4e6a17 | 280 | { |
5452e425 | 281 | const struct xt_target *t; |
2e4e6a17 HW |
282 | int have_rev = 0; |
283 | ||
284 | list_for_each_entry(t, &xt[af].target, list) { | |
285 | if (strcmp(t->name, name) == 0) { | |
286 | if (t->revision > *bestp) | |
287 | *bestp = t->revision; | |
288 | if (t->revision == revision) | |
289 | have_rev = 1; | |
290 | } | |
291 | } | |
292 | return have_rev; | |
293 | } | |
294 | ||
295 | /* Returns true or false (if no such extension at all) */ | |
76108cea | 296 | int xt_find_revision(u8 af, const char *name, u8 revision, int target, |
2e4e6a17 HW |
297 | int *err) |
298 | { | |
299 | int have_rev, best = -1; | |
300 | ||
9e19bb6d | 301 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) { |
2e4e6a17 HW |
302 | *err = -EINTR; |
303 | return 1; | |
304 | } | |
305 | if (target == 1) | |
306 | have_rev = target_revfn(af, name, revision, &best); | |
307 | else | |
308 | have_rev = match_revfn(af, name, revision, &best); | |
9e19bb6d | 309 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
310 | |
311 | /* Nothing at all? Return 0 to try loading module. */ | |
312 | if (best == -1) { | |
313 | *err = -ENOENT; | |
314 | return 0; | |
315 | } | |
316 | ||
317 | *err = best; | |
318 | if (!have_rev) | |
319 | *err = -EPROTONOSUPPORT; | |
320 | return 1; | |
321 | } | |
322 | EXPORT_SYMBOL_GPL(xt_find_revision); | |
323 | ||
916a917d | 324 | int xt_check_match(struct xt_mtchk_param *par, |
9b4fce7a | 325 | unsigned int size, u_int8_t proto, bool inv_proto) |
37f9f733 | 326 | { |
9b4fce7a JE |
327 | if (XT_ALIGN(par->match->matchsize) != size && |
328 | par->match->matchsize != -1) { | |
043ef46c JE |
329 | /* |
330 | * ebt_among is exempt from centralized matchsize checking | |
331 | * because it uses a dynamic-size data set. | |
332 | */ | |
37f9f733 | 333 | printk("%s_tables: %s match: invalid size %Zu != %u\n", |
916a917d | 334 | xt_prefix[par->family], par->match->name, |
9b4fce7a | 335 | XT_ALIGN(par->match->matchsize), size); |
37f9f733 PM |
336 | return -EINVAL; |
337 | } | |
9b4fce7a JE |
338 | if (par->match->table != NULL && |
339 | strcmp(par->match->table, par->table) != 0) { | |
37f9f733 | 340 | printk("%s_tables: %s match: only valid in %s table, not %s\n", |
916a917d | 341 | xt_prefix[par->family], par->match->name, |
9b4fce7a | 342 | par->match->table, par->table); |
37f9f733 PM |
343 | return -EINVAL; |
344 | } | |
9b4fce7a | 345 | if (par->match->hooks && (par->hook_mask & ~par->match->hooks) != 0) { |
102befab | 346 | printk("%s_tables: %s match: bad hook_mask %#x/%#x\n", |
916a917d | 347 | xt_prefix[par->family], par->match->name, |
9b4fce7a | 348 | par->hook_mask, par->match->hooks); |
37f9f733 PM |
349 | return -EINVAL; |
350 | } | |
9b4fce7a | 351 | if (par->match->proto && (par->match->proto != proto || inv_proto)) { |
37f9f733 | 352 | printk("%s_tables: %s match: only valid for protocol %u\n", |
916a917d JE |
353 | xt_prefix[par->family], par->match->name, |
354 | par->match->proto); | |
37f9f733 PM |
355 | return -EINVAL; |
356 | } | |
9b4fce7a | 357 | if (par->match->checkentry != NULL && !par->match->checkentry(par)) |
367c6790 | 358 | return -EINVAL; |
37f9f733 PM |
359 | return 0; |
360 | } | |
361 | EXPORT_SYMBOL_GPL(xt_check_match); | |
362 | ||
2722971c | 363 | #ifdef CONFIG_COMPAT |
76108cea | 364 | int xt_compat_add_offset(u_int8_t af, unsigned int offset, short delta) |
b386d9f5 PM |
365 | { |
366 | struct compat_delta *tmp; | |
367 | ||
368 | tmp = kmalloc(sizeof(struct compat_delta), GFP_KERNEL); | |
369 | if (!tmp) | |
370 | return -ENOMEM; | |
371 | ||
372 | tmp->offset = offset; | |
373 | tmp->delta = delta; | |
374 | ||
375 | if (xt[af].compat_offsets) { | |
376 | tmp->next = xt[af].compat_offsets->next; | |
377 | xt[af].compat_offsets->next = tmp; | |
378 | } else { | |
379 | xt[af].compat_offsets = tmp; | |
380 | tmp->next = NULL; | |
381 | } | |
382 | return 0; | |
383 | } | |
384 | EXPORT_SYMBOL_GPL(xt_compat_add_offset); | |
385 | ||
76108cea | 386 | void xt_compat_flush_offsets(u_int8_t af) |
b386d9f5 PM |
387 | { |
388 | struct compat_delta *tmp, *next; | |
389 | ||
390 | if (xt[af].compat_offsets) { | |
391 | for (tmp = xt[af].compat_offsets; tmp; tmp = next) { | |
392 | next = tmp->next; | |
393 | kfree(tmp); | |
394 | } | |
395 | xt[af].compat_offsets = NULL; | |
396 | } | |
397 | } | |
398 | EXPORT_SYMBOL_GPL(xt_compat_flush_offsets); | |
399 | ||
76108cea | 400 | short xt_compat_calc_jump(u_int8_t af, unsigned int offset) |
b386d9f5 PM |
401 | { |
402 | struct compat_delta *tmp; | |
403 | short delta; | |
404 | ||
405 | for (tmp = xt[af].compat_offsets, delta = 0; tmp; tmp = tmp->next) | |
406 | if (tmp->offset < offset) | |
407 | delta += tmp->delta; | |
408 | return delta; | |
409 | } | |
410 | EXPORT_SYMBOL_GPL(xt_compat_calc_jump); | |
411 | ||
5452e425 | 412 | int xt_compat_match_offset(const struct xt_match *match) |
2722971c | 413 | { |
9fa492cd PM |
414 | u_int16_t csize = match->compatsize ? : match->matchsize; |
415 | return XT_ALIGN(match->matchsize) - COMPAT_XT_ALIGN(csize); | |
416 | } | |
417 | EXPORT_SYMBOL_GPL(xt_compat_match_offset); | |
418 | ||
89566951 | 419 | int xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr, |
b0a6363c | 420 | unsigned int *size) |
9fa492cd | 421 | { |
5452e425 | 422 | const struct xt_match *match = m->u.kernel.match; |
9fa492cd PM |
423 | struct compat_xt_entry_match *cm = (struct compat_xt_entry_match *)m; |
424 | int pad, off = xt_compat_match_offset(match); | |
425 | u_int16_t msize = cm->u.user.match_size; | |
426 | ||
427 | m = *dstptr; | |
428 | memcpy(m, cm, sizeof(*cm)); | |
429 | if (match->compat_from_user) | |
430 | match->compat_from_user(m->data, cm->data); | |
431 | else | |
432 | memcpy(m->data, cm->data, msize - sizeof(*cm)); | |
433 | pad = XT_ALIGN(match->matchsize) - match->matchsize; | |
434 | if (pad > 0) | |
435 | memset(m->data + match->matchsize, 0, pad); | |
436 | ||
437 | msize += off; | |
438 | m->u.user.match_size = msize; | |
439 | ||
440 | *size += off; | |
441 | *dstptr += msize; | |
89566951 | 442 | return 0; |
9fa492cd PM |
443 | } |
444 | EXPORT_SYMBOL_GPL(xt_compat_match_from_user); | |
445 | ||
446 | int xt_compat_match_to_user(struct xt_entry_match *m, void __user **dstptr, | |
b0a6363c | 447 | unsigned int *size) |
9fa492cd | 448 | { |
5452e425 | 449 | const struct xt_match *match = m->u.kernel.match; |
9fa492cd PM |
450 | struct compat_xt_entry_match __user *cm = *dstptr; |
451 | int off = xt_compat_match_offset(match); | |
452 | u_int16_t msize = m->u.user.match_size - off; | |
453 | ||
454 | if (copy_to_user(cm, m, sizeof(*cm)) || | |
a18aa31b PM |
455 | put_user(msize, &cm->u.user.match_size) || |
456 | copy_to_user(cm->u.user.name, m->u.kernel.match->name, | |
457 | strlen(m->u.kernel.match->name) + 1)) | |
601e68e1 | 458 | return -EFAULT; |
9fa492cd PM |
459 | |
460 | if (match->compat_to_user) { | |
461 | if (match->compat_to_user((void __user *)cm->data, m->data)) | |
462 | return -EFAULT; | |
463 | } else { | |
464 | if (copy_to_user(cm->data, m->data, msize - sizeof(*cm))) | |
465 | return -EFAULT; | |
2722971c | 466 | } |
9fa492cd PM |
467 | |
468 | *size -= off; | |
469 | *dstptr += msize; | |
470 | return 0; | |
2722971c | 471 | } |
9fa492cd PM |
472 | EXPORT_SYMBOL_GPL(xt_compat_match_to_user); |
473 | #endif /* CONFIG_COMPAT */ | |
2722971c | 474 | |
916a917d | 475 | int xt_check_target(struct xt_tgchk_param *par, |
af5d6dc2 | 476 | unsigned int size, u_int8_t proto, bool inv_proto) |
37f9f733 | 477 | { |
af5d6dc2 | 478 | if (XT_ALIGN(par->target->targetsize) != size) { |
37f9f733 | 479 | printk("%s_tables: %s target: invalid size %Zu != %u\n", |
916a917d | 480 | xt_prefix[par->family], par->target->name, |
af5d6dc2 | 481 | XT_ALIGN(par->target->targetsize), size); |
37f9f733 PM |
482 | return -EINVAL; |
483 | } | |
af5d6dc2 JE |
484 | if (par->target->table != NULL && |
485 | strcmp(par->target->table, par->table) != 0) { | |
37f9f733 | 486 | printk("%s_tables: %s target: only valid in %s table, not %s\n", |
916a917d | 487 | xt_prefix[par->family], par->target->name, |
af5d6dc2 | 488 | par->target->table, par->table); |
37f9f733 PM |
489 | return -EINVAL; |
490 | } | |
af5d6dc2 | 491 | if (par->target->hooks && (par->hook_mask & ~par->target->hooks) != 0) { |
102befab | 492 | printk("%s_tables: %s target: bad hook_mask %#x/%#x\n", |
916a917d JE |
493 | xt_prefix[par->family], par->target->name, |
494 | par->hook_mask, par->target->hooks); | |
37f9f733 PM |
495 | return -EINVAL; |
496 | } | |
af5d6dc2 | 497 | if (par->target->proto && (par->target->proto != proto || inv_proto)) { |
37f9f733 | 498 | printk("%s_tables: %s target: only valid for protocol %u\n", |
916a917d | 499 | xt_prefix[par->family], par->target->name, |
af5d6dc2 | 500 | par->target->proto); |
37f9f733 PM |
501 | return -EINVAL; |
502 | } | |
af5d6dc2 | 503 | if (par->target->checkentry != NULL && !par->target->checkentry(par)) |
367c6790 | 504 | return -EINVAL; |
37f9f733 PM |
505 | return 0; |
506 | } | |
507 | EXPORT_SYMBOL_GPL(xt_check_target); | |
508 | ||
2722971c | 509 | #ifdef CONFIG_COMPAT |
5452e425 | 510 | int xt_compat_target_offset(const struct xt_target *target) |
2722971c | 511 | { |
9fa492cd PM |
512 | u_int16_t csize = target->compatsize ? : target->targetsize; |
513 | return XT_ALIGN(target->targetsize) - COMPAT_XT_ALIGN(csize); | |
514 | } | |
515 | EXPORT_SYMBOL_GPL(xt_compat_target_offset); | |
516 | ||
517 | void xt_compat_target_from_user(struct xt_entry_target *t, void **dstptr, | |
b0a6363c | 518 | unsigned int *size) |
9fa492cd | 519 | { |
5452e425 | 520 | const struct xt_target *target = t->u.kernel.target; |
9fa492cd PM |
521 | struct compat_xt_entry_target *ct = (struct compat_xt_entry_target *)t; |
522 | int pad, off = xt_compat_target_offset(target); | |
523 | u_int16_t tsize = ct->u.user.target_size; | |
524 | ||
525 | t = *dstptr; | |
526 | memcpy(t, ct, sizeof(*ct)); | |
527 | if (target->compat_from_user) | |
528 | target->compat_from_user(t->data, ct->data); | |
529 | else | |
530 | memcpy(t->data, ct->data, tsize - sizeof(*ct)); | |
531 | pad = XT_ALIGN(target->targetsize) - target->targetsize; | |
532 | if (pad > 0) | |
533 | memset(t->data + target->targetsize, 0, pad); | |
534 | ||
535 | tsize += off; | |
536 | t->u.user.target_size = tsize; | |
537 | ||
538 | *size += off; | |
539 | *dstptr += tsize; | |
540 | } | |
541 | EXPORT_SYMBOL_GPL(xt_compat_target_from_user); | |
542 | ||
543 | int xt_compat_target_to_user(struct xt_entry_target *t, void __user **dstptr, | |
b0a6363c | 544 | unsigned int *size) |
9fa492cd | 545 | { |
5452e425 | 546 | const struct xt_target *target = t->u.kernel.target; |
9fa492cd PM |
547 | struct compat_xt_entry_target __user *ct = *dstptr; |
548 | int off = xt_compat_target_offset(target); | |
549 | u_int16_t tsize = t->u.user.target_size - off; | |
550 | ||
551 | if (copy_to_user(ct, t, sizeof(*ct)) || | |
a18aa31b PM |
552 | put_user(tsize, &ct->u.user.target_size) || |
553 | copy_to_user(ct->u.user.name, t->u.kernel.target->name, | |
554 | strlen(t->u.kernel.target->name) + 1)) | |
601e68e1 | 555 | return -EFAULT; |
9fa492cd PM |
556 | |
557 | if (target->compat_to_user) { | |
558 | if (target->compat_to_user((void __user *)ct->data, t->data)) | |
559 | return -EFAULT; | |
560 | } else { | |
561 | if (copy_to_user(ct->data, t->data, tsize - sizeof(*ct))) | |
562 | return -EFAULT; | |
2722971c | 563 | } |
9fa492cd PM |
564 | |
565 | *size -= off; | |
566 | *dstptr += tsize; | |
567 | return 0; | |
2722971c | 568 | } |
9fa492cd | 569 | EXPORT_SYMBOL_GPL(xt_compat_target_to_user); |
2722971c DM |
570 | #endif |
571 | ||
2e4e6a17 HW |
572 | struct xt_table_info *xt_alloc_table_info(unsigned int size) |
573 | { | |
574 | struct xt_table_info *newinfo; | |
575 | int cpu; | |
576 | ||
577 | /* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */ | |
578 | if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > num_physpages) | |
579 | return NULL; | |
580 | ||
259d4e41 | 581 | newinfo = kzalloc(XT_TABLE_INFO_SZ, GFP_KERNEL); |
2e4e6a17 HW |
582 | if (!newinfo) |
583 | return NULL; | |
584 | ||
585 | newinfo->size = size; | |
586 | ||
6f912042 | 587 | for_each_possible_cpu(cpu) { |
2e4e6a17 HW |
588 | if (size <= PAGE_SIZE) |
589 | newinfo->entries[cpu] = kmalloc_node(size, | |
590 | GFP_KERNEL, | |
591 | cpu_to_node(cpu)); | |
592 | else | |
593 | newinfo->entries[cpu] = vmalloc_node(size, | |
594 | cpu_to_node(cpu)); | |
595 | ||
596 | if (newinfo->entries[cpu] == NULL) { | |
597 | xt_free_table_info(newinfo); | |
598 | return NULL; | |
599 | } | |
600 | } | |
601 | ||
602 | return newinfo; | |
603 | } | |
604 | EXPORT_SYMBOL(xt_alloc_table_info); | |
605 | ||
606 | void xt_free_table_info(struct xt_table_info *info) | |
607 | { | |
608 | int cpu; | |
609 | ||
6f912042 | 610 | for_each_possible_cpu(cpu) { |
2e4e6a17 HW |
611 | if (info->size <= PAGE_SIZE) |
612 | kfree(info->entries[cpu]); | |
613 | else | |
614 | vfree(info->entries[cpu]); | |
615 | } | |
616 | kfree(info); | |
617 | } | |
618 | EXPORT_SYMBOL(xt_free_table_info); | |
619 | ||
620 | /* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */ | |
76108cea JE |
621 | struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af, |
622 | const char *name) | |
2e4e6a17 HW |
623 | { |
624 | struct xt_table *t; | |
625 | ||
9e19bb6d | 626 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
2e4e6a17 HW |
627 | return ERR_PTR(-EINTR); |
628 | ||
8d870052 | 629 | list_for_each_entry(t, &net->xt.tables[af], list) |
2e4e6a17 HW |
630 | if (strcmp(t->name, name) == 0 && try_module_get(t->me)) |
631 | return t; | |
9e19bb6d | 632 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
633 | return NULL; |
634 | } | |
635 | EXPORT_SYMBOL_GPL(xt_find_table_lock); | |
636 | ||
637 | void xt_table_unlock(struct xt_table *table) | |
638 | { | |
9e19bb6d | 639 | mutex_unlock(&xt[table->af].mutex); |
2e4e6a17 HW |
640 | } |
641 | EXPORT_SYMBOL_GPL(xt_table_unlock); | |
642 | ||
2722971c | 643 | #ifdef CONFIG_COMPAT |
76108cea | 644 | void xt_compat_lock(u_int8_t af) |
2722971c DM |
645 | { |
646 | mutex_lock(&xt[af].compat_mutex); | |
647 | } | |
648 | EXPORT_SYMBOL_GPL(xt_compat_lock); | |
649 | ||
76108cea | 650 | void xt_compat_unlock(u_int8_t af) |
2722971c DM |
651 | { |
652 | mutex_unlock(&xt[af].compat_mutex); | |
653 | } | |
654 | EXPORT_SYMBOL_GPL(xt_compat_unlock); | |
655 | #endif | |
2e4e6a17 HW |
656 | |
657 | struct xt_table_info * | |
658 | xt_replace_table(struct xt_table *table, | |
659 | unsigned int num_counters, | |
660 | struct xt_table_info *newinfo, | |
661 | int *error) | |
662 | { | |
663 | struct xt_table_info *oldinfo, *private; | |
664 | ||
665 | /* Do the substitution. */ | |
666 | write_lock_bh(&table->lock); | |
667 | private = table->private; | |
668 | /* Check inside lock: is the old number correct? */ | |
669 | if (num_counters != private->number) { | |
670 | duprintf("num_counters != table->private->number (%u/%u)\n", | |
671 | num_counters, private->number); | |
672 | write_unlock_bh(&table->lock); | |
673 | *error = -EAGAIN; | |
674 | return NULL; | |
675 | } | |
676 | oldinfo = private; | |
677 | table->private = newinfo; | |
678 | newinfo->initial_entries = oldinfo->initial_entries; | |
679 | write_unlock_bh(&table->lock); | |
680 | ||
681 | return oldinfo; | |
682 | } | |
683 | EXPORT_SYMBOL_GPL(xt_replace_table); | |
684 | ||
8d870052 | 685 | struct xt_table *xt_register_table(struct net *net, struct xt_table *table, |
a98da11d AD |
686 | struct xt_table_info *bootstrap, |
687 | struct xt_table_info *newinfo) | |
2e4e6a17 HW |
688 | { |
689 | int ret; | |
690 | struct xt_table_info *private; | |
df0933dc | 691 | struct xt_table *t; |
2e4e6a17 | 692 | |
44d34e72 AD |
693 | /* Don't add one object to multiple lists. */ |
694 | table = kmemdup(table, sizeof(struct xt_table), GFP_KERNEL); | |
695 | if (!table) { | |
696 | ret = -ENOMEM; | |
697 | goto out; | |
698 | } | |
699 | ||
9e19bb6d | 700 | ret = mutex_lock_interruptible(&xt[table->af].mutex); |
2e4e6a17 | 701 | if (ret != 0) |
44d34e72 | 702 | goto out_free; |
2e4e6a17 HW |
703 | |
704 | /* Don't autoload: we'd eat our tail... */ | |
8d870052 | 705 | list_for_each_entry(t, &net->xt.tables[table->af], list) { |
df0933dc PM |
706 | if (strcmp(t->name, table->name) == 0) { |
707 | ret = -EEXIST; | |
708 | goto unlock; | |
709 | } | |
2e4e6a17 HW |
710 | } |
711 | ||
712 | /* Simplifies replace_table code. */ | |
713 | table->private = bootstrap; | |
91536b7a | 714 | rwlock_init(&table->lock); |
2e4e6a17 HW |
715 | if (!xt_replace_table(table, 0, newinfo, &ret)) |
716 | goto unlock; | |
717 | ||
718 | private = table->private; | |
719 | duprintf("table->private->number = %u\n", private->number); | |
720 | ||
721 | /* save number of initial entries */ | |
722 | private->initial_entries = private->number; | |
723 | ||
8d870052 | 724 | list_add(&table->list, &net->xt.tables[table->af]); |
a98da11d AD |
725 | mutex_unlock(&xt[table->af].mutex); |
726 | return table; | |
2e4e6a17 | 727 | |
2e4e6a17 | 728 | unlock: |
9e19bb6d | 729 | mutex_unlock(&xt[table->af].mutex); |
44d34e72 AD |
730 | out_free: |
731 | kfree(table); | |
a98da11d AD |
732 | out: |
733 | return ERR_PTR(ret); | |
2e4e6a17 HW |
734 | } |
735 | EXPORT_SYMBOL_GPL(xt_register_table); | |
736 | ||
737 | void *xt_unregister_table(struct xt_table *table) | |
738 | { | |
739 | struct xt_table_info *private; | |
740 | ||
9e19bb6d | 741 | mutex_lock(&xt[table->af].mutex); |
2e4e6a17 | 742 | private = table->private; |
df0933dc | 743 | list_del(&table->list); |
9e19bb6d | 744 | mutex_unlock(&xt[table->af].mutex); |
44d34e72 | 745 | kfree(table); |
2e4e6a17 HW |
746 | |
747 | return private; | |
748 | } | |
749 | EXPORT_SYMBOL_GPL(xt_unregister_table); | |
750 | ||
751 | #ifdef CONFIG_PROC_FS | |
715cf35a AD |
752 | struct xt_names_priv { |
753 | struct seq_net_private p; | |
76108cea | 754 | u_int8_t af; |
715cf35a | 755 | }; |
025d93d1 | 756 | static void *xt_table_seq_start(struct seq_file *seq, loff_t *pos) |
2e4e6a17 | 757 | { |
715cf35a | 758 | struct xt_names_priv *priv = seq->private; |
1218854a | 759 | struct net *net = seq_file_net(seq); |
76108cea | 760 | u_int8_t af = priv->af; |
2e4e6a17 | 761 | |
025d93d1 | 762 | mutex_lock(&xt[af].mutex); |
715cf35a | 763 | return seq_list_start(&net->xt.tables[af], *pos); |
025d93d1 | 764 | } |
2e4e6a17 | 765 | |
025d93d1 AD |
766 | static void *xt_table_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
767 | { | |
715cf35a | 768 | struct xt_names_priv *priv = seq->private; |
1218854a | 769 | struct net *net = seq_file_net(seq); |
76108cea | 770 | u_int8_t af = priv->af; |
2e4e6a17 | 771 | |
715cf35a | 772 | return seq_list_next(v, &net->xt.tables[af], pos); |
2e4e6a17 HW |
773 | } |
774 | ||
025d93d1 | 775 | static void xt_table_seq_stop(struct seq_file *seq, void *v) |
2e4e6a17 | 776 | { |
715cf35a | 777 | struct xt_names_priv *priv = seq->private; |
76108cea | 778 | u_int8_t af = priv->af; |
2e4e6a17 | 779 | |
025d93d1 AD |
780 | mutex_unlock(&xt[af].mutex); |
781 | } | |
2e4e6a17 | 782 | |
025d93d1 AD |
783 | static int xt_table_seq_show(struct seq_file *seq, void *v) |
784 | { | |
785 | struct xt_table *table = list_entry(v, struct xt_table, list); | |
2e4e6a17 | 786 | |
025d93d1 AD |
787 | if (strlen(table->name)) |
788 | return seq_printf(seq, "%s\n", table->name); | |
789 | else | |
790 | return 0; | |
791 | } | |
601e68e1 | 792 | |
025d93d1 AD |
793 | static const struct seq_operations xt_table_seq_ops = { |
794 | .start = xt_table_seq_start, | |
795 | .next = xt_table_seq_next, | |
796 | .stop = xt_table_seq_stop, | |
797 | .show = xt_table_seq_show, | |
798 | }; | |
799 | ||
800 | static int xt_table_open(struct inode *inode, struct file *file) | |
801 | { | |
802 | int ret; | |
715cf35a | 803 | struct xt_names_priv *priv; |
025d93d1 | 804 | |
715cf35a AD |
805 | ret = seq_open_net(inode, file, &xt_table_seq_ops, |
806 | sizeof(struct xt_names_priv)); | |
025d93d1 | 807 | if (!ret) { |
715cf35a AD |
808 | priv = ((struct seq_file *)file->private_data)->private; |
809 | priv->af = (unsigned long)PDE(inode)->data; | |
025d93d1 AD |
810 | } |
811 | return ret; | |
2e4e6a17 HW |
812 | } |
813 | ||
025d93d1 AD |
814 | static const struct file_operations xt_table_ops = { |
815 | .owner = THIS_MODULE, | |
816 | .open = xt_table_open, | |
817 | .read = seq_read, | |
818 | .llseek = seq_lseek, | |
0e93bb94 | 819 | .release = seq_release_net, |
025d93d1 AD |
820 | }; |
821 | ||
822 | static void *xt_match_seq_start(struct seq_file *seq, loff_t *pos) | |
2e4e6a17 | 823 | { |
025d93d1 AD |
824 | struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private; |
825 | u_int16_t af = (unsigned long)pde->data; | |
2e4e6a17 | 826 | |
025d93d1 AD |
827 | mutex_lock(&xt[af].mutex); |
828 | return seq_list_start(&xt[af].match, *pos); | |
829 | } | |
601e68e1 | 830 | |
025d93d1 AD |
831 | static void *xt_match_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
832 | { | |
833 | struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private; | |
834 | u_int16_t af = (unsigned long)pde->data; | |
2e4e6a17 | 835 | |
025d93d1 | 836 | return seq_list_next(v, &xt[af].match, pos); |
2e4e6a17 HW |
837 | } |
838 | ||
025d93d1 | 839 | static void xt_match_seq_stop(struct seq_file *seq, void *v) |
2e4e6a17 HW |
840 | { |
841 | struct proc_dir_entry *pde = seq->private; | |
025d93d1 | 842 | u_int16_t af = (unsigned long)pde->data; |
2e4e6a17 | 843 | |
9e19bb6d | 844 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
845 | } |
846 | ||
025d93d1 | 847 | static int xt_match_seq_show(struct seq_file *seq, void *v) |
2e4e6a17 | 848 | { |
025d93d1 | 849 | struct xt_match *match = list_entry(v, struct xt_match, list); |
2e4e6a17 | 850 | |
025d93d1 AD |
851 | if (strlen(match->name)) |
852 | return seq_printf(seq, "%s\n", match->name); | |
2e4e6a17 HW |
853 | else |
854 | return 0; | |
855 | } | |
856 | ||
025d93d1 AD |
857 | static const struct seq_operations xt_match_seq_ops = { |
858 | .start = xt_match_seq_start, | |
859 | .next = xt_match_seq_next, | |
860 | .stop = xt_match_seq_stop, | |
861 | .show = xt_match_seq_show, | |
2e4e6a17 HW |
862 | }; |
863 | ||
025d93d1 | 864 | static int xt_match_open(struct inode *inode, struct file *file) |
2e4e6a17 HW |
865 | { |
866 | int ret; | |
867 | ||
025d93d1 | 868 | ret = seq_open(file, &xt_match_seq_ops); |
2e4e6a17 HW |
869 | if (!ret) { |
870 | struct seq_file *seq = file->private_data; | |
2e4e6a17 | 871 | |
025d93d1 | 872 | seq->private = PDE(inode); |
2e4e6a17 | 873 | } |
025d93d1 AD |
874 | return ret; |
875 | } | |
876 | ||
877 | static const struct file_operations xt_match_ops = { | |
878 | .owner = THIS_MODULE, | |
879 | .open = xt_match_open, | |
880 | .read = seq_read, | |
881 | .llseek = seq_lseek, | |
882 | .release = seq_release, | |
883 | }; | |
2e4e6a17 | 884 | |
025d93d1 AD |
885 | static void *xt_target_seq_start(struct seq_file *seq, loff_t *pos) |
886 | { | |
887 | struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private; | |
888 | u_int16_t af = (unsigned long)pde->data; | |
889 | ||
890 | mutex_lock(&xt[af].mutex); | |
891 | return seq_list_start(&xt[af].target, *pos); | |
892 | } | |
893 | ||
894 | static void *xt_target_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
895 | { | |
896 | struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private; | |
897 | u_int16_t af = (unsigned long)pde->data; | |
898 | ||
899 | return seq_list_next(v, &xt[af].target, pos); | |
900 | } | |
901 | ||
902 | static void xt_target_seq_stop(struct seq_file *seq, void *v) | |
903 | { | |
904 | struct proc_dir_entry *pde = seq->private; | |
905 | u_int16_t af = (unsigned long)pde->data; | |
906 | ||
907 | mutex_unlock(&xt[af].mutex); | |
908 | } | |
909 | ||
910 | static int xt_target_seq_show(struct seq_file *seq, void *v) | |
911 | { | |
912 | struct xt_target *target = list_entry(v, struct xt_target, list); | |
913 | ||
914 | if (strlen(target->name)) | |
915 | return seq_printf(seq, "%s\n", target->name); | |
916 | else | |
917 | return 0; | |
918 | } | |
919 | ||
920 | static const struct seq_operations xt_target_seq_ops = { | |
921 | .start = xt_target_seq_start, | |
922 | .next = xt_target_seq_next, | |
923 | .stop = xt_target_seq_stop, | |
924 | .show = xt_target_seq_show, | |
925 | }; | |
926 | ||
927 | static int xt_target_open(struct inode *inode, struct file *file) | |
928 | { | |
929 | int ret; | |
930 | ||
931 | ret = seq_open(file, &xt_target_seq_ops); | |
932 | if (!ret) { | |
933 | struct seq_file *seq = file->private_data; | |
934 | ||
935 | seq->private = PDE(inode); | |
936 | } | |
2e4e6a17 HW |
937 | return ret; |
938 | } | |
939 | ||
025d93d1 | 940 | static const struct file_operations xt_target_ops = { |
2e4e6a17 | 941 | .owner = THIS_MODULE, |
025d93d1 | 942 | .open = xt_target_open, |
2e4e6a17 HW |
943 | .read = seq_read, |
944 | .llseek = seq_lseek, | |
945 | .release = seq_release, | |
946 | }; | |
947 | ||
948 | #define FORMAT_TABLES "_tables_names" | |
949 | #define FORMAT_MATCHES "_tables_matches" | |
950 | #define FORMAT_TARGETS "_tables_targets" | |
951 | ||
952 | #endif /* CONFIG_PROC_FS */ | |
953 | ||
76108cea | 954 | int xt_proto_init(struct net *net, u_int8_t af) |
2e4e6a17 HW |
955 | { |
956 | #ifdef CONFIG_PROC_FS | |
957 | char buf[XT_FUNCTION_MAXNAMELEN]; | |
958 | struct proc_dir_entry *proc; | |
959 | #endif | |
960 | ||
7e9c6eeb | 961 | if (af >= ARRAY_SIZE(xt_prefix)) |
2e4e6a17 HW |
962 | return -EINVAL; |
963 | ||
964 | ||
965 | #ifdef CONFIG_PROC_FS | |
ce18afe5 | 966 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 967 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
8b169240 DL |
968 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_table_ops, |
969 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
970 | if (!proc) |
971 | goto out; | |
2e4e6a17 | 972 | |
ce18afe5 | 973 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 974 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
8b169240 DL |
975 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_match_ops, |
976 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
977 | if (!proc) |
978 | goto out_remove_tables; | |
2e4e6a17 | 979 | |
ce18afe5 | 980 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 981 | strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
8b169240 DL |
982 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_target_ops, |
983 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
984 | if (!proc) |
985 | goto out_remove_matches; | |
2e4e6a17 HW |
986 | #endif |
987 | ||
988 | return 0; | |
989 | ||
990 | #ifdef CONFIG_PROC_FS | |
991 | out_remove_matches: | |
ce18afe5 | 992 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 993 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
3cb609d5 | 994 | proc_net_remove(net, buf); |
2e4e6a17 HW |
995 | |
996 | out_remove_tables: | |
ce18afe5 | 997 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 998 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
3cb609d5 | 999 | proc_net_remove(net, buf); |
2e4e6a17 HW |
1000 | out: |
1001 | return -1; | |
1002 | #endif | |
1003 | } | |
1004 | EXPORT_SYMBOL_GPL(xt_proto_init); | |
1005 | ||
76108cea | 1006 | void xt_proto_fini(struct net *net, u_int8_t af) |
2e4e6a17 HW |
1007 | { |
1008 | #ifdef CONFIG_PROC_FS | |
1009 | char buf[XT_FUNCTION_MAXNAMELEN]; | |
1010 | ||
ce18afe5 | 1011 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1012 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
3cb609d5 | 1013 | proc_net_remove(net, buf); |
2e4e6a17 | 1014 | |
ce18afe5 | 1015 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1016 | strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
3cb609d5 | 1017 | proc_net_remove(net, buf); |
2e4e6a17 | 1018 | |
ce18afe5 | 1019 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1020 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
3cb609d5 | 1021 | proc_net_remove(net, buf); |
2e4e6a17 HW |
1022 | #endif /*CONFIG_PROC_FS*/ |
1023 | } | |
1024 | EXPORT_SYMBOL_GPL(xt_proto_fini); | |
1025 | ||
8d870052 AD |
1026 | static int __net_init xt_net_init(struct net *net) |
1027 | { | |
1028 | int i; | |
1029 | ||
7e9c6eeb | 1030 | for (i = 0; i < NFPROTO_NUMPROTO; i++) |
8d870052 AD |
1031 | INIT_LIST_HEAD(&net->xt.tables[i]); |
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | static struct pernet_operations xt_net_ops = { | |
1036 | .init = xt_net_init, | |
1037 | }; | |
2e4e6a17 HW |
1038 | |
1039 | static int __init xt_init(void) | |
1040 | { | |
8d870052 | 1041 | int i, rv; |
2e4e6a17 | 1042 | |
7e9c6eeb | 1043 | xt = kmalloc(sizeof(struct xt_af) * NFPROTO_NUMPROTO, GFP_KERNEL); |
2e4e6a17 HW |
1044 | if (!xt) |
1045 | return -ENOMEM; | |
1046 | ||
7e9c6eeb | 1047 | for (i = 0; i < NFPROTO_NUMPROTO; i++) { |
9e19bb6d | 1048 | mutex_init(&xt[i].mutex); |
2722971c DM |
1049 | #ifdef CONFIG_COMPAT |
1050 | mutex_init(&xt[i].compat_mutex); | |
b386d9f5 | 1051 | xt[i].compat_offsets = NULL; |
2722971c | 1052 | #endif |
2e4e6a17 HW |
1053 | INIT_LIST_HEAD(&xt[i].target); |
1054 | INIT_LIST_HEAD(&xt[i].match); | |
2e4e6a17 | 1055 | } |
8d870052 AD |
1056 | rv = register_pernet_subsys(&xt_net_ops); |
1057 | if (rv < 0) | |
1058 | kfree(xt); | |
1059 | return rv; | |
2e4e6a17 HW |
1060 | } |
1061 | ||
1062 | static void __exit xt_fini(void) | |
1063 | { | |
8d870052 | 1064 | unregister_pernet_subsys(&xt_net_ops); |
2e4e6a17 HW |
1065 | kfree(xt); |
1066 | } | |
1067 | ||
1068 | module_init(xt_init); | |
1069 | module_exit(xt_fini); | |
1070 |