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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>"); | |
33 | MODULE_DESCRIPTION("[ip,ip6,arp]_tables backend module"); | |
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); |
2e4e6a17 HW |
212 | return ERR_PTR(err); |
213 | } | |
214 | EXPORT_SYMBOL(xt_find_match); | |
215 | ||
216 | /* Find target, grabs ref. Returns ERR_PTR() on error. */ | |
76108cea | 217 | struct xt_target *xt_find_target(u8 af, const char *name, u8 revision) |
2e4e6a17 HW |
218 | { |
219 | struct xt_target *t; | |
220 | int err = 0; | |
221 | ||
9e19bb6d | 222 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
2e4e6a17 HW |
223 | return ERR_PTR(-EINTR); |
224 | ||
225 | list_for_each_entry(t, &xt[af].target, list) { | |
226 | if (strcmp(t->name, name) == 0) { | |
227 | if (t->revision == revision) { | |
228 | if (try_module_get(t->me)) { | |
9e19bb6d | 229 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
230 | return t; |
231 | } | |
232 | } else | |
233 | err = -EPROTOTYPE; /* Found something. */ | |
234 | } | |
235 | } | |
9e19bb6d | 236 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
237 | return ERR_PTR(err); |
238 | } | |
239 | EXPORT_SYMBOL(xt_find_target); | |
240 | ||
76108cea | 241 | struct xt_target *xt_request_find_target(u8 af, const char *name, u8 revision) |
2e4e6a17 HW |
242 | { |
243 | struct xt_target *target; | |
244 | ||
245 | target = try_then_request_module(xt_find_target(af, name, revision), | |
37f9f733 | 246 | "%st_%s", xt_prefix[af], name); |
2e4e6a17 HW |
247 | if (IS_ERR(target) || !target) |
248 | return NULL; | |
249 | return target; | |
250 | } | |
251 | EXPORT_SYMBOL_GPL(xt_request_find_target); | |
252 | ||
76108cea | 253 | static int match_revfn(u8 af, const char *name, u8 revision, int *bestp) |
2e4e6a17 | 254 | { |
5452e425 | 255 | const struct xt_match *m; |
2e4e6a17 HW |
256 | int have_rev = 0; |
257 | ||
258 | list_for_each_entry(m, &xt[af].match, list) { | |
259 | if (strcmp(m->name, name) == 0) { | |
260 | if (m->revision > *bestp) | |
261 | *bestp = m->revision; | |
262 | if (m->revision == revision) | |
263 | have_rev = 1; | |
264 | } | |
265 | } | |
266 | return have_rev; | |
267 | } | |
268 | ||
76108cea | 269 | static int target_revfn(u8 af, const char *name, u8 revision, int *bestp) |
2e4e6a17 | 270 | { |
5452e425 | 271 | const struct xt_target *t; |
2e4e6a17 HW |
272 | int have_rev = 0; |
273 | ||
274 | list_for_each_entry(t, &xt[af].target, list) { | |
275 | if (strcmp(t->name, name) == 0) { | |
276 | if (t->revision > *bestp) | |
277 | *bestp = t->revision; | |
278 | if (t->revision == revision) | |
279 | have_rev = 1; | |
280 | } | |
281 | } | |
282 | return have_rev; | |
283 | } | |
284 | ||
285 | /* Returns true or false (if no such extension at all) */ | |
76108cea | 286 | int xt_find_revision(u8 af, const char *name, u8 revision, int target, |
2e4e6a17 HW |
287 | int *err) |
288 | { | |
289 | int have_rev, best = -1; | |
290 | ||
9e19bb6d | 291 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) { |
2e4e6a17 HW |
292 | *err = -EINTR; |
293 | return 1; | |
294 | } | |
295 | if (target == 1) | |
296 | have_rev = target_revfn(af, name, revision, &best); | |
297 | else | |
298 | have_rev = match_revfn(af, name, revision, &best); | |
9e19bb6d | 299 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
300 | |
301 | /* Nothing at all? Return 0 to try loading module. */ | |
302 | if (best == -1) { | |
303 | *err = -ENOENT; | |
304 | return 0; | |
305 | } | |
306 | ||
307 | *err = best; | |
308 | if (!have_rev) | |
309 | *err = -EPROTONOSUPPORT; | |
310 | return 1; | |
311 | } | |
312 | EXPORT_SYMBOL_GPL(xt_find_revision); | |
313 | ||
37f9f733 | 314 | int xt_check_match(const struct xt_match *match, unsigned short family, |
601e68e1 | 315 | unsigned int size, const char *table, unsigned int hook_mask, |
37f9f733 PM |
316 | unsigned short proto, int inv_proto) |
317 | { | |
318 | if (XT_ALIGN(match->matchsize) != size) { | |
319 | printk("%s_tables: %s match: invalid size %Zu != %u\n", | |
320 | xt_prefix[family], match->name, | |
321 | XT_ALIGN(match->matchsize), size); | |
322 | return -EINVAL; | |
323 | } | |
324 | if (match->table && strcmp(match->table, table)) { | |
325 | printk("%s_tables: %s match: only valid in %s table, not %s\n", | |
326 | xt_prefix[family], match->name, match->table, table); | |
327 | return -EINVAL; | |
328 | } | |
329 | if (match->hooks && (hook_mask & ~match->hooks) != 0) { | |
5faf4153 BS |
330 | printk("%s_tables: %s match: bad hook_mask %u/%u\n", |
331 | xt_prefix[family], match->name, hook_mask, match->hooks); | |
37f9f733 PM |
332 | return -EINVAL; |
333 | } | |
334 | if (match->proto && (match->proto != proto || inv_proto)) { | |
335 | printk("%s_tables: %s match: only valid for protocol %u\n", | |
336 | xt_prefix[family], match->name, match->proto); | |
337 | return -EINVAL; | |
338 | } | |
339 | return 0; | |
340 | } | |
341 | EXPORT_SYMBOL_GPL(xt_check_match); | |
342 | ||
2722971c | 343 | #ifdef CONFIG_COMPAT |
76108cea | 344 | int xt_compat_add_offset(u_int8_t af, unsigned int offset, short delta) |
b386d9f5 PM |
345 | { |
346 | struct compat_delta *tmp; | |
347 | ||
348 | tmp = kmalloc(sizeof(struct compat_delta), GFP_KERNEL); | |
349 | if (!tmp) | |
350 | return -ENOMEM; | |
351 | ||
352 | tmp->offset = offset; | |
353 | tmp->delta = delta; | |
354 | ||
355 | if (xt[af].compat_offsets) { | |
356 | tmp->next = xt[af].compat_offsets->next; | |
357 | xt[af].compat_offsets->next = tmp; | |
358 | } else { | |
359 | xt[af].compat_offsets = tmp; | |
360 | tmp->next = NULL; | |
361 | } | |
362 | return 0; | |
363 | } | |
364 | EXPORT_SYMBOL_GPL(xt_compat_add_offset); | |
365 | ||
76108cea | 366 | void xt_compat_flush_offsets(u_int8_t af) |
b386d9f5 PM |
367 | { |
368 | struct compat_delta *tmp, *next; | |
369 | ||
370 | if (xt[af].compat_offsets) { | |
371 | for (tmp = xt[af].compat_offsets; tmp; tmp = next) { | |
372 | next = tmp->next; | |
373 | kfree(tmp); | |
374 | } | |
375 | xt[af].compat_offsets = NULL; | |
376 | } | |
377 | } | |
378 | EXPORT_SYMBOL_GPL(xt_compat_flush_offsets); | |
379 | ||
76108cea | 380 | short xt_compat_calc_jump(u_int8_t af, unsigned int offset) |
b386d9f5 PM |
381 | { |
382 | struct compat_delta *tmp; | |
383 | short delta; | |
384 | ||
385 | for (tmp = xt[af].compat_offsets, delta = 0; tmp; tmp = tmp->next) | |
386 | if (tmp->offset < offset) | |
387 | delta += tmp->delta; | |
388 | return delta; | |
389 | } | |
390 | EXPORT_SYMBOL_GPL(xt_compat_calc_jump); | |
391 | ||
5452e425 | 392 | int xt_compat_match_offset(const struct xt_match *match) |
2722971c | 393 | { |
9fa492cd PM |
394 | u_int16_t csize = match->compatsize ? : match->matchsize; |
395 | return XT_ALIGN(match->matchsize) - COMPAT_XT_ALIGN(csize); | |
396 | } | |
397 | EXPORT_SYMBOL_GPL(xt_compat_match_offset); | |
398 | ||
89566951 | 399 | int xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr, |
b0a6363c | 400 | unsigned int *size) |
9fa492cd | 401 | { |
5452e425 | 402 | const struct xt_match *match = m->u.kernel.match; |
9fa492cd PM |
403 | struct compat_xt_entry_match *cm = (struct compat_xt_entry_match *)m; |
404 | int pad, off = xt_compat_match_offset(match); | |
405 | u_int16_t msize = cm->u.user.match_size; | |
406 | ||
407 | m = *dstptr; | |
408 | memcpy(m, cm, sizeof(*cm)); | |
409 | if (match->compat_from_user) | |
410 | match->compat_from_user(m->data, cm->data); | |
411 | else | |
412 | memcpy(m->data, cm->data, msize - sizeof(*cm)); | |
413 | pad = XT_ALIGN(match->matchsize) - match->matchsize; | |
414 | if (pad > 0) | |
415 | memset(m->data + match->matchsize, 0, pad); | |
416 | ||
417 | msize += off; | |
418 | m->u.user.match_size = msize; | |
419 | ||
420 | *size += off; | |
421 | *dstptr += msize; | |
89566951 | 422 | return 0; |
9fa492cd PM |
423 | } |
424 | EXPORT_SYMBOL_GPL(xt_compat_match_from_user); | |
425 | ||
426 | int xt_compat_match_to_user(struct xt_entry_match *m, void __user **dstptr, | |
b0a6363c | 427 | unsigned int *size) |
9fa492cd | 428 | { |
5452e425 | 429 | const struct xt_match *match = m->u.kernel.match; |
9fa492cd PM |
430 | struct compat_xt_entry_match __user *cm = *dstptr; |
431 | int off = xt_compat_match_offset(match); | |
432 | u_int16_t msize = m->u.user.match_size - off; | |
433 | ||
434 | if (copy_to_user(cm, m, sizeof(*cm)) || | |
a18aa31b PM |
435 | put_user(msize, &cm->u.user.match_size) || |
436 | copy_to_user(cm->u.user.name, m->u.kernel.match->name, | |
437 | strlen(m->u.kernel.match->name) + 1)) | |
601e68e1 | 438 | return -EFAULT; |
9fa492cd PM |
439 | |
440 | if (match->compat_to_user) { | |
441 | if (match->compat_to_user((void __user *)cm->data, m->data)) | |
442 | return -EFAULT; | |
443 | } else { | |
444 | if (copy_to_user(cm->data, m->data, msize - sizeof(*cm))) | |
445 | return -EFAULT; | |
2722971c | 446 | } |
9fa492cd PM |
447 | |
448 | *size -= off; | |
449 | *dstptr += msize; | |
450 | return 0; | |
2722971c | 451 | } |
9fa492cd PM |
452 | EXPORT_SYMBOL_GPL(xt_compat_match_to_user); |
453 | #endif /* CONFIG_COMPAT */ | |
2722971c | 454 | |
37f9f733 PM |
455 | int xt_check_target(const struct xt_target *target, unsigned short family, |
456 | unsigned int size, const char *table, unsigned int hook_mask, | |
457 | unsigned short proto, int inv_proto) | |
458 | { | |
459 | if (XT_ALIGN(target->targetsize) != size) { | |
460 | printk("%s_tables: %s target: invalid size %Zu != %u\n", | |
461 | xt_prefix[family], target->name, | |
462 | XT_ALIGN(target->targetsize), size); | |
463 | return -EINVAL; | |
464 | } | |
465 | if (target->table && strcmp(target->table, table)) { | |
466 | printk("%s_tables: %s target: only valid in %s table, not %s\n", | |
467 | xt_prefix[family], target->name, target->table, table); | |
468 | return -EINVAL; | |
469 | } | |
470 | if (target->hooks && (hook_mask & ~target->hooks) != 0) { | |
5faf4153 BS |
471 | printk("%s_tables: %s target: bad hook_mask %u/%u\n", |
472 | xt_prefix[family], target->name, hook_mask, | |
473 | target->hooks); | |
37f9f733 PM |
474 | return -EINVAL; |
475 | } | |
476 | if (target->proto && (target->proto != proto || inv_proto)) { | |
477 | printk("%s_tables: %s target: only valid for protocol %u\n", | |
478 | xt_prefix[family], target->name, target->proto); | |
479 | return -EINVAL; | |
480 | } | |
481 | return 0; | |
482 | } | |
483 | EXPORT_SYMBOL_GPL(xt_check_target); | |
484 | ||
2722971c | 485 | #ifdef CONFIG_COMPAT |
5452e425 | 486 | int xt_compat_target_offset(const struct xt_target *target) |
2722971c | 487 | { |
9fa492cd PM |
488 | u_int16_t csize = target->compatsize ? : target->targetsize; |
489 | return XT_ALIGN(target->targetsize) - COMPAT_XT_ALIGN(csize); | |
490 | } | |
491 | EXPORT_SYMBOL_GPL(xt_compat_target_offset); | |
492 | ||
493 | void xt_compat_target_from_user(struct xt_entry_target *t, void **dstptr, | |
b0a6363c | 494 | unsigned int *size) |
9fa492cd | 495 | { |
5452e425 | 496 | const struct xt_target *target = t->u.kernel.target; |
9fa492cd PM |
497 | struct compat_xt_entry_target *ct = (struct compat_xt_entry_target *)t; |
498 | int pad, off = xt_compat_target_offset(target); | |
499 | u_int16_t tsize = ct->u.user.target_size; | |
500 | ||
501 | t = *dstptr; | |
502 | memcpy(t, ct, sizeof(*ct)); | |
503 | if (target->compat_from_user) | |
504 | target->compat_from_user(t->data, ct->data); | |
505 | else | |
506 | memcpy(t->data, ct->data, tsize - sizeof(*ct)); | |
507 | pad = XT_ALIGN(target->targetsize) - target->targetsize; | |
508 | if (pad > 0) | |
509 | memset(t->data + target->targetsize, 0, pad); | |
510 | ||
511 | tsize += off; | |
512 | t->u.user.target_size = tsize; | |
513 | ||
514 | *size += off; | |
515 | *dstptr += tsize; | |
516 | } | |
517 | EXPORT_SYMBOL_GPL(xt_compat_target_from_user); | |
518 | ||
519 | int xt_compat_target_to_user(struct xt_entry_target *t, void __user **dstptr, | |
b0a6363c | 520 | unsigned int *size) |
9fa492cd | 521 | { |
5452e425 | 522 | const struct xt_target *target = t->u.kernel.target; |
9fa492cd PM |
523 | struct compat_xt_entry_target __user *ct = *dstptr; |
524 | int off = xt_compat_target_offset(target); | |
525 | u_int16_t tsize = t->u.user.target_size - off; | |
526 | ||
527 | if (copy_to_user(ct, t, sizeof(*ct)) || | |
a18aa31b PM |
528 | put_user(tsize, &ct->u.user.target_size) || |
529 | copy_to_user(ct->u.user.name, t->u.kernel.target->name, | |
530 | strlen(t->u.kernel.target->name) + 1)) | |
601e68e1 | 531 | return -EFAULT; |
9fa492cd PM |
532 | |
533 | if (target->compat_to_user) { | |
534 | if (target->compat_to_user((void __user *)ct->data, t->data)) | |
535 | return -EFAULT; | |
536 | } else { | |
537 | if (copy_to_user(ct->data, t->data, tsize - sizeof(*ct))) | |
538 | return -EFAULT; | |
2722971c | 539 | } |
9fa492cd PM |
540 | |
541 | *size -= off; | |
542 | *dstptr += tsize; | |
543 | return 0; | |
2722971c | 544 | } |
9fa492cd | 545 | EXPORT_SYMBOL_GPL(xt_compat_target_to_user); |
2722971c DM |
546 | #endif |
547 | ||
2e4e6a17 HW |
548 | struct xt_table_info *xt_alloc_table_info(unsigned int size) |
549 | { | |
550 | struct xt_table_info *newinfo; | |
551 | int cpu; | |
552 | ||
553 | /* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */ | |
554 | if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > num_physpages) | |
555 | return NULL; | |
556 | ||
259d4e41 | 557 | newinfo = kzalloc(XT_TABLE_INFO_SZ, GFP_KERNEL); |
2e4e6a17 HW |
558 | if (!newinfo) |
559 | return NULL; | |
560 | ||
561 | newinfo->size = size; | |
562 | ||
6f912042 | 563 | for_each_possible_cpu(cpu) { |
2e4e6a17 HW |
564 | if (size <= PAGE_SIZE) |
565 | newinfo->entries[cpu] = kmalloc_node(size, | |
566 | GFP_KERNEL, | |
567 | cpu_to_node(cpu)); | |
568 | else | |
569 | newinfo->entries[cpu] = vmalloc_node(size, | |
570 | cpu_to_node(cpu)); | |
571 | ||
572 | if (newinfo->entries[cpu] == NULL) { | |
573 | xt_free_table_info(newinfo); | |
574 | return NULL; | |
575 | } | |
576 | } | |
577 | ||
578 | return newinfo; | |
579 | } | |
580 | EXPORT_SYMBOL(xt_alloc_table_info); | |
581 | ||
582 | void xt_free_table_info(struct xt_table_info *info) | |
583 | { | |
584 | int cpu; | |
585 | ||
6f912042 | 586 | for_each_possible_cpu(cpu) { |
2e4e6a17 HW |
587 | if (info->size <= PAGE_SIZE) |
588 | kfree(info->entries[cpu]); | |
589 | else | |
590 | vfree(info->entries[cpu]); | |
591 | } | |
592 | kfree(info); | |
593 | } | |
594 | EXPORT_SYMBOL(xt_free_table_info); | |
595 | ||
596 | /* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */ | |
76108cea JE |
597 | struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af, |
598 | const char *name) | |
2e4e6a17 HW |
599 | { |
600 | struct xt_table *t; | |
601 | ||
9e19bb6d | 602 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
2e4e6a17 HW |
603 | return ERR_PTR(-EINTR); |
604 | ||
8d870052 | 605 | list_for_each_entry(t, &net->xt.tables[af], list) |
2e4e6a17 HW |
606 | if (strcmp(t->name, name) == 0 && try_module_get(t->me)) |
607 | return t; | |
9e19bb6d | 608 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
609 | return NULL; |
610 | } | |
611 | EXPORT_SYMBOL_GPL(xt_find_table_lock); | |
612 | ||
613 | void xt_table_unlock(struct xt_table *table) | |
614 | { | |
9e19bb6d | 615 | mutex_unlock(&xt[table->af].mutex); |
2e4e6a17 HW |
616 | } |
617 | EXPORT_SYMBOL_GPL(xt_table_unlock); | |
618 | ||
2722971c | 619 | #ifdef CONFIG_COMPAT |
76108cea | 620 | void xt_compat_lock(u_int8_t af) |
2722971c DM |
621 | { |
622 | mutex_lock(&xt[af].compat_mutex); | |
623 | } | |
624 | EXPORT_SYMBOL_GPL(xt_compat_lock); | |
625 | ||
76108cea | 626 | void xt_compat_unlock(u_int8_t af) |
2722971c DM |
627 | { |
628 | mutex_unlock(&xt[af].compat_mutex); | |
629 | } | |
630 | EXPORT_SYMBOL_GPL(xt_compat_unlock); | |
631 | #endif | |
2e4e6a17 HW |
632 | |
633 | struct xt_table_info * | |
634 | xt_replace_table(struct xt_table *table, | |
635 | unsigned int num_counters, | |
636 | struct xt_table_info *newinfo, | |
637 | int *error) | |
638 | { | |
639 | struct xt_table_info *oldinfo, *private; | |
640 | ||
641 | /* Do the substitution. */ | |
642 | write_lock_bh(&table->lock); | |
643 | private = table->private; | |
644 | /* Check inside lock: is the old number correct? */ | |
645 | if (num_counters != private->number) { | |
646 | duprintf("num_counters != table->private->number (%u/%u)\n", | |
647 | num_counters, private->number); | |
648 | write_unlock_bh(&table->lock); | |
649 | *error = -EAGAIN; | |
650 | return NULL; | |
651 | } | |
652 | oldinfo = private; | |
653 | table->private = newinfo; | |
654 | newinfo->initial_entries = oldinfo->initial_entries; | |
655 | write_unlock_bh(&table->lock); | |
656 | ||
657 | return oldinfo; | |
658 | } | |
659 | EXPORT_SYMBOL_GPL(xt_replace_table); | |
660 | ||
8d870052 | 661 | struct xt_table *xt_register_table(struct net *net, struct xt_table *table, |
a98da11d AD |
662 | struct xt_table_info *bootstrap, |
663 | struct xt_table_info *newinfo) | |
2e4e6a17 HW |
664 | { |
665 | int ret; | |
666 | struct xt_table_info *private; | |
df0933dc | 667 | struct xt_table *t; |
2e4e6a17 | 668 | |
44d34e72 AD |
669 | /* Don't add one object to multiple lists. */ |
670 | table = kmemdup(table, sizeof(struct xt_table), GFP_KERNEL); | |
671 | if (!table) { | |
672 | ret = -ENOMEM; | |
673 | goto out; | |
674 | } | |
675 | ||
9e19bb6d | 676 | ret = mutex_lock_interruptible(&xt[table->af].mutex); |
2e4e6a17 | 677 | if (ret != 0) |
44d34e72 | 678 | goto out_free; |
2e4e6a17 HW |
679 | |
680 | /* Don't autoload: we'd eat our tail... */ | |
8d870052 | 681 | list_for_each_entry(t, &net->xt.tables[table->af], list) { |
df0933dc PM |
682 | if (strcmp(t->name, table->name) == 0) { |
683 | ret = -EEXIST; | |
684 | goto unlock; | |
685 | } | |
2e4e6a17 HW |
686 | } |
687 | ||
688 | /* Simplifies replace_table code. */ | |
689 | table->private = bootstrap; | |
91536b7a | 690 | rwlock_init(&table->lock); |
2e4e6a17 HW |
691 | if (!xt_replace_table(table, 0, newinfo, &ret)) |
692 | goto unlock; | |
693 | ||
694 | private = table->private; | |
695 | duprintf("table->private->number = %u\n", private->number); | |
696 | ||
697 | /* save number of initial entries */ | |
698 | private->initial_entries = private->number; | |
699 | ||
8d870052 | 700 | list_add(&table->list, &net->xt.tables[table->af]); |
a98da11d AD |
701 | mutex_unlock(&xt[table->af].mutex); |
702 | return table; | |
2e4e6a17 | 703 | |
2e4e6a17 | 704 | unlock: |
9e19bb6d | 705 | mutex_unlock(&xt[table->af].mutex); |
44d34e72 AD |
706 | out_free: |
707 | kfree(table); | |
a98da11d AD |
708 | out: |
709 | return ERR_PTR(ret); | |
2e4e6a17 HW |
710 | } |
711 | EXPORT_SYMBOL_GPL(xt_register_table); | |
712 | ||
713 | void *xt_unregister_table(struct xt_table *table) | |
714 | { | |
715 | struct xt_table_info *private; | |
716 | ||
9e19bb6d | 717 | mutex_lock(&xt[table->af].mutex); |
2e4e6a17 | 718 | private = table->private; |
df0933dc | 719 | list_del(&table->list); |
9e19bb6d | 720 | mutex_unlock(&xt[table->af].mutex); |
44d34e72 | 721 | kfree(table); |
2e4e6a17 HW |
722 | |
723 | return private; | |
724 | } | |
725 | EXPORT_SYMBOL_GPL(xt_unregister_table); | |
726 | ||
727 | #ifdef CONFIG_PROC_FS | |
715cf35a AD |
728 | struct xt_names_priv { |
729 | struct seq_net_private p; | |
76108cea | 730 | u_int8_t af; |
715cf35a | 731 | }; |
025d93d1 | 732 | static void *xt_table_seq_start(struct seq_file *seq, loff_t *pos) |
2e4e6a17 | 733 | { |
715cf35a | 734 | struct xt_names_priv *priv = seq->private; |
1218854a | 735 | struct net *net = seq_file_net(seq); |
76108cea | 736 | u_int8_t af = priv->af; |
2e4e6a17 | 737 | |
025d93d1 | 738 | mutex_lock(&xt[af].mutex); |
715cf35a | 739 | return seq_list_start(&net->xt.tables[af], *pos); |
025d93d1 | 740 | } |
2e4e6a17 | 741 | |
025d93d1 AD |
742 | static void *xt_table_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
743 | { | |
715cf35a | 744 | struct xt_names_priv *priv = seq->private; |
1218854a | 745 | struct net *net = seq_file_net(seq); |
76108cea | 746 | u_int8_t af = priv->af; |
2e4e6a17 | 747 | |
715cf35a | 748 | return seq_list_next(v, &net->xt.tables[af], pos); |
2e4e6a17 HW |
749 | } |
750 | ||
025d93d1 | 751 | static void xt_table_seq_stop(struct seq_file *seq, void *v) |
2e4e6a17 | 752 | { |
715cf35a | 753 | struct xt_names_priv *priv = seq->private; |
76108cea | 754 | u_int8_t af = priv->af; |
2e4e6a17 | 755 | |
025d93d1 AD |
756 | mutex_unlock(&xt[af].mutex); |
757 | } | |
2e4e6a17 | 758 | |
025d93d1 AD |
759 | static int xt_table_seq_show(struct seq_file *seq, void *v) |
760 | { | |
761 | struct xt_table *table = list_entry(v, struct xt_table, list); | |
2e4e6a17 | 762 | |
025d93d1 AD |
763 | if (strlen(table->name)) |
764 | return seq_printf(seq, "%s\n", table->name); | |
765 | else | |
766 | return 0; | |
767 | } | |
601e68e1 | 768 | |
025d93d1 AD |
769 | static const struct seq_operations xt_table_seq_ops = { |
770 | .start = xt_table_seq_start, | |
771 | .next = xt_table_seq_next, | |
772 | .stop = xt_table_seq_stop, | |
773 | .show = xt_table_seq_show, | |
774 | }; | |
775 | ||
776 | static int xt_table_open(struct inode *inode, struct file *file) | |
777 | { | |
778 | int ret; | |
715cf35a | 779 | struct xt_names_priv *priv; |
025d93d1 | 780 | |
715cf35a AD |
781 | ret = seq_open_net(inode, file, &xt_table_seq_ops, |
782 | sizeof(struct xt_names_priv)); | |
025d93d1 | 783 | if (!ret) { |
715cf35a AD |
784 | priv = ((struct seq_file *)file->private_data)->private; |
785 | priv->af = (unsigned long)PDE(inode)->data; | |
025d93d1 AD |
786 | } |
787 | return ret; | |
2e4e6a17 HW |
788 | } |
789 | ||
025d93d1 AD |
790 | static const struct file_operations xt_table_ops = { |
791 | .owner = THIS_MODULE, | |
792 | .open = xt_table_open, | |
793 | .read = seq_read, | |
794 | .llseek = seq_lseek, | |
0e93bb94 | 795 | .release = seq_release_net, |
025d93d1 AD |
796 | }; |
797 | ||
798 | static void *xt_match_seq_start(struct seq_file *seq, loff_t *pos) | |
2e4e6a17 | 799 | { |
025d93d1 AD |
800 | struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private; |
801 | u_int16_t af = (unsigned long)pde->data; | |
2e4e6a17 | 802 | |
025d93d1 AD |
803 | mutex_lock(&xt[af].mutex); |
804 | return seq_list_start(&xt[af].match, *pos); | |
805 | } | |
601e68e1 | 806 | |
025d93d1 AD |
807 | static void *xt_match_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
808 | { | |
809 | struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private; | |
810 | u_int16_t af = (unsigned long)pde->data; | |
2e4e6a17 | 811 | |
025d93d1 | 812 | return seq_list_next(v, &xt[af].match, pos); |
2e4e6a17 HW |
813 | } |
814 | ||
025d93d1 | 815 | static void xt_match_seq_stop(struct seq_file *seq, void *v) |
2e4e6a17 HW |
816 | { |
817 | struct proc_dir_entry *pde = seq->private; | |
025d93d1 | 818 | u_int16_t af = (unsigned long)pde->data; |
2e4e6a17 | 819 | |
9e19bb6d | 820 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
821 | } |
822 | ||
025d93d1 | 823 | static int xt_match_seq_show(struct seq_file *seq, void *v) |
2e4e6a17 | 824 | { |
025d93d1 | 825 | struct xt_match *match = list_entry(v, struct xt_match, list); |
2e4e6a17 | 826 | |
025d93d1 AD |
827 | if (strlen(match->name)) |
828 | return seq_printf(seq, "%s\n", match->name); | |
2e4e6a17 HW |
829 | else |
830 | return 0; | |
831 | } | |
832 | ||
025d93d1 AD |
833 | static const struct seq_operations xt_match_seq_ops = { |
834 | .start = xt_match_seq_start, | |
835 | .next = xt_match_seq_next, | |
836 | .stop = xt_match_seq_stop, | |
837 | .show = xt_match_seq_show, | |
2e4e6a17 HW |
838 | }; |
839 | ||
025d93d1 | 840 | static int xt_match_open(struct inode *inode, struct file *file) |
2e4e6a17 HW |
841 | { |
842 | int ret; | |
843 | ||
025d93d1 | 844 | ret = seq_open(file, &xt_match_seq_ops); |
2e4e6a17 HW |
845 | if (!ret) { |
846 | struct seq_file *seq = file->private_data; | |
2e4e6a17 | 847 | |
025d93d1 | 848 | seq->private = PDE(inode); |
2e4e6a17 | 849 | } |
025d93d1 AD |
850 | return ret; |
851 | } | |
852 | ||
853 | static const struct file_operations xt_match_ops = { | |
854 | .owner = THIS_MODULE, | |
855 | .open = xt_match_open, | |
856 | .read = seq_read, | |
857 | .llseek = seq_lseek, | |
858 | .release = seq_release, | |
859 | }; | |
2e4e6a17 | 860 | |
025d93d1 AD |
861 | static void *xt_target_seq_start(struct seq_file *seq, loff_t *pos) |
862 | { | |
863 | struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private; | |
864 | u_int16_t af = (unsigned long)pde->data; | |
865 | ||
866 | mutex_lock(&xt[af].mutex); | |
867 | return seq_list_start(&xt[af].target, *pos); | |
868 | } | |
869 | ||
870 | static void *xt_target_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
871 | { | |
872 | struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private; | |
873 | u_int16_t af = (unsigned long)pde->data; | |
874 | ||
875 | return seq_list_next(v, &xt[af].target, pos); | |
876 | } | |
877 | ||
878 | static void xt_target_seq_stop(struct seq_file *seq, void *v) | |
879 | { | |
880 | struct proc_dir_entry *pde = seq->private; | |
881 | u_int16_t af = (unsigned long)pde->data; | |
882 | ||
883 | mutex_unlock(&xt[af].mutex); | |
884 | } | |
885 | ||
886 | static int xt_target_seq_show(struct seq_file *seq, void *v) | |
887 | { | |
888 | struct xt_target *target = list_entry(v, struct xt_target, list); | |
889 | ||
890 | if (strlen(target->name)) | |
891 | return seq_printf(seq, "%s\n", target->name); | |
892 | else | |
893 | return 0; | |
894 | } | |
895 | ||
896 | static const struct seq_operations xt_target_seq_ops = { | |
897 | .start = xt_target_seq_start, | |
898 | .next = xt_target_seq_next, | |
899 | .stop = xt_target_seq_stop, | |
900 | .show = xt_target_seq_show, | |
901 | }; | |
902 | ||
903 | static int xt_target_open(struct inode *inode, struct file *file) | |
904 | { | |
905 | int ret; | |
906 | ||
907 | ret = seq_open(file, &xt_target_seq_ops); | |
908 | if (!ret) { | |
909 | struct seq_file *seq = file->private_data; | |
910 | ||
911 | seq->private = PDE(inode); | |
912 | } | |
2e4e6a17 HW |
913 | return ret; |
914 | } | |
915 | ||
025d93d1 | 916 | static const struct file_operations xt_target_ops = { |
2e4e6a17 | 917 | .owner = THIS_MODULE, |
025d93d1 | 918 | .open = xt_target_open, |
2e4e6a17 HW |
919 | .read = seq_read, |
920 | .llseek = seq_lseek, | |
921 | .release = seq_release, | |
922 | }; | |
923 | ||
924 | #define FORMAT_TABLES "_tables_names" | |
925 | #define FORMAT_MATCHES "_tables_matches" | |
926 | #define FORMAT_TARGETS "_tables_targets" | |
927 | ||
928 | #endif /* CONFIG_PROC_FS */ | |
929 | ||
76108cea | 930 | int xt_proto_init(struct net *net, u_int8_t af) |
2e4e6a17 HW |
931 | { |
932 | #ifdef CONFIG_PROC_FS | |
933 | char buf[XT_FUNCTION_MAXNAMELEN]; | |
934 | struct proc_dir_entry *proc; | |
935 | #endif | |
936 | ||
7e9c6eeb | 937 | if (af >= ARRAY_SIZE(xt_prefix)) |
2e4e6a17 HW |
938 | return -EINVAL; |
939 | ||
940 | ||
941 | #ifdef CONFIG_PROC_FS | |
ce18afe5 | 942 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 943 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
8b169240 DL |
944 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_table_ops, |
945 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
946 | if (!proc) |
947 | goto out; | |
2e4e6a17 | 948 | |
ce18afe5 | 949 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 950 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
8b169240 DL |
951 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_match_ops, |
952 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
953 | if (!proc) |
954 | goto out_remove_tables; | |
2e4e6a17 | 955 | |
ce18afe5 | 956 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 957 | strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
8b169240 DL |
958 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_target_ops, |
959 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
960 | if (!proc) |
961 | goto out_remove_matches; | |
2e4e6a17 HW |
962 | #endif |
963 | ||
964 | return 0; | |
965 | ||
966 | #ifdef CONFIG_PROC_FS | |
967 | out_remove_matches: | |
ce18afe5 | 968 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 969 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
3cb609d5 | 970 | proc_net_remove(net, buf); |
2e4e6a17 HW |
971 | |
972 | out_remove_tables: | |
ce18afe5 | 973 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 974 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
3cb609d5 | 975 | proc_net_remove(net, buf); |
2e4e6a17 HW |
976 | out: |
977 | return -1; | |
978 | #endif | |
979 | } | |
980 | EXPORT_SYMBOL_GPL(xt_proto_init); | |
981 | ||
76108cea | 982 | void xt_proto_fini(struct net *net, u_int8_t af) |
2e4e6a17 HW |
983 | { |
984 | #ifdef CONFIG_PROC_FS | |
985 | char buf[XT_FUNCTION_MAXNAMELEN]; | |
986 | ||
ce18afe5 | 987 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 988 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
3cb609d5 | 989 | proc_net_remove(net, buf); |
2e4e6a17 | 990 | |
ce18afe5 | 991 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 992 | strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
3cb609d5 | 993 | proc_net_remove(net, buf); |
2e4e6a17 | 994 | |
ce18afe5 | 995 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 996 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
3cb609d5 | 997 | proc_net_remove(net, buf); |
2e4e6a17 HW |
998 | #endif /*CONFIG_PROC_FS*/ |
999 | } | |
1000 | EXPORT_SYMBOL_GPL(xt_proto_fini); | |
1001 | ||
8d870052 AD |
1002 | static int __net_init xt_net_init(struct net *net) |
1003 | { | |
1004 | int i; | |
1005 | ||
7e9c6eeb | 1006 | for (i = 0; i < NFPROTO_NUMPROTO; i++) |
8d870052 AD |
1007 | INIT_LIST_HEAD(&net->xt.tables[i]); |
1008 | return 0; | |
1009 | } | |
1010 | ||
1011 | static struct pernet_operations xt_net_ops = { | |
1012 | .init = xt_net_init, | |
1013 | }; | |
2e4e6a17 HW |
1014 | |
1015 | static int __init xt_init(void) | |
1016 | { | |
8d870052 | 1017 | int i, rv; |
2e4e6a17 | 1018 | |
7e9c6eeb | 1019 | xt = kmalloc(sizeof(struct xt_af) * NFPROTO_NUMPROTO, GFP_KERNEL); |
2e4e6a17 HW |
1020 | if (!xt) |
1021 | return -ENOMEM; | |
1022 | ||
7e9c6eeb | 1023 | for (i = 0; i < NFPROTO_NUMPROTO; i++) { |
9e19bb6d | 1024 | mutex_init(&xt[i].mutex); |
2722971c DM |
1025 | #ifdef CONFIG_COMPAT |
1026 | mutex_init(&xt[i].compat_mutex); | |
b386d9f5 | 1027 | xt[i].compat_offsets = NULL; |
2722971c | 1028 | #endif |
2e4e6a17 HW |
1029 | INIT_LIST_HEAD(&xt[i].target); |
1030 | INIT_LIST_HEAD(&xt[i].match); | |
2e4e6a17 | 1031 | } |
8d870052 AD |
1032 | rv = register_pernet_subsys(&xt_net_ops); |
1033 | if (rv < 0) | |
1034 | kfree(xt); | |
1035 | return rv; | |
2e4e6a17 HW |
1036 | } |
1037 | ||
1038 | static void __exit xt_fini(void) | |
1039 | { | |
8d870052 | 1040 | unregister_pernet_subsys(&xt_net_ops); |
2e4e6a17 HW |
1041 | kfree(xt); |
1042 | } | |
1043 | ||
1044 | module_init(xt_init); | |
1045 | module_exit(xt_fini); | |
1046 |