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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); |
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 | ||
37f9f733 | 324 | int xt_check_match(const struct xt_match *match, unsigned short family, |
601e68e1 | 325 | unsigned int size, const char *table, unsigned int hook_mask, |
37f9f733 PM |
326 | unsigned short proto, int inv_proto) |
327 | { | |
328 | if (XT_ALIGN(match->matchsize) != size) { | |
329 | printk("%s_tables: %s match: invalid size %Zu != %u\n", | |
330 | xt_prefix[family], match->name, | |
331 | XT_ALIGN(match->matchsize), size); | |
332 | return -EINVAL; | |
333 | } | |
334 | if (match->table && strcmp(match->table, table)) { | |
335 | printk("%s_tables: %s match: only valid in %s table, not %s\n", | |
336 | xt_prefix[family], match->name, match->table, table); | |
337 | return -EINVAL; | |
338 | } | |
339 | if (match->hooks && (hook_mask & ~match->hooks) != 0) { | |
5faf4153 BS |
340 | printk("%s_tables: %s match: bad hook_mask %u/%u\n", |
341 | xt_prefix[family], match->name, hook_mask, match->hooks); | |
37f9f733 PM |
342 | return -EINVAL; |
343 | } | |
344 | if (match->proto && (match->proto != proto || inv_proto)) { | |
345 | printk("%s_tables: %s match: only valid for protocol %u\n", | |
346 | xt_prefix[family], match->name, match->proto); | |
347 | return -EINVAL; | |
348 | } | |
349 | return 0; | |
350 | } | |
351 | EXPORT_SYMBOL_GPL(xt_check_match); | |
352 | ||
2722971c | 353 | #ifdef CONFIG_COMPAT |
76108cea | 354 | int xt_compat_add_offset(u_int8_t af, unsigned int offset, short delta) |
b386d9f5 PM |
355 | { |
356 | struct compat_delta *tmp; | |
357 | ||
358 | tmp = kmalloc(sizeof(struct compat_delta), GFP_KERNEL); | |
359 | if (!tmp) | |
360 | return -ENOMEM; | |
361 | ||
362 | tmp->offset = offset; | |
363 | tmp->delta = delta; | |
364 | ||
365 | if (xt[af].compat_offsets) { | |
366 | tmp->next = xt[af].compat_offsets->next; | |
367 | xt[af].compat_offsets->next = tmp; | |
368 | } else { | |
369 | xt[af].compat_offsets = tmp; | |
370 | tmp->next = NULL; | |
371 | } | |
372 | return 0; | |
373 | } | |
374 | EXPORT_SYMBOL_GPL(xt_compat_add_offset); | |
375 | ||
76108cea | 376 | void xt_compat_flush_offsets(u_int8_t af) |
b386d9f5 PM |
377 | { |
378 | struct compat_delta *tmp, *next; | |
379 | ||
380 | if (xt[af].compat_offsets) { | |
381 | for (tmp = xt[af].compat_offsets; tmp; tmp = next) { | |
382 | next = tmp->next; | |
383 | kfree(tmp); | |
384 | } | |
385 | xt[af].compat_offsets = NULL; | |
386 | } | |
387 | } | |
388 | EXPORT_SYMBOL_GPL(xt_compat_flush_offsets); | |
389 | ||
76108cea | 390 | short xt_compat_calc_jump(u_int8_t af, unsigned int offset) |
b386d9f5 PM |
391 | { |
392 | struct compat_delta *tmp; | |
393 | short delta; | |
394 | ||
395 | for (tmp = xt[af].compat_offsets, delta = 0; tmp; tmp = tmp->next) | |
396 | if (tmp->offset < offset) | |
397 | delta += tmp->delta; | |
398 | return delta; | |
399 | } | |
400 | EXPORT_SYMBOL_GPL(xt_compat_calc_jump); | |
401 | ||
5452e425 | 402 | int xt_compat_match_offset(const struct xt_match *match) |
2722971c | 403 | { |
9fa492cd PM |
404 | u_int16_t csize = match->compatsize ? : match->matchsize; |
405 | return XT_ALIGN(match->matchsize) - COMPAT_XT_ALIGN(csize); | |
406 | } | |
407 | EXPORT_SYMBOL_GPL(xt_compat_match_offset); | |
408 | ||
89566951 | 409 | int xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr, |
b0a6363c | 410 | unsigned int *size) |
9fa492cd | 411 | { |
5452e425 | 412 | const struct xt_match *match = m->u.kernel.match; |
9fa492cd PM |
413 | struct compat_xt_entry_match *cm = (struct compat_xt_entry_match *)m; |
414 | int pad, off = xt_compat_match_offset(match); | |
415 | u_int16_t msize = cm->u.user.match_size; | |
416 | ||
417 | m = *dstptr; | |
418 | memcpy(m, cm, sizeof(*cm)); | |
419 | if (match->compat_from_user) | |
420 | match->compat_from_user(m->data, cm->data); | |
421 | else | |
422 | memcpy(m->data, cm->data, msize - sizeof(*cm)); | |
423 | pad = XT_ALIGN(match->matchsize) - match->matchsize; | |
424 | if (pad > 0) | |
425 | memset(m->data + match->matchsize, 0, pad); | |
426 | ||
427 | msize += off; | |
428 | m->u.user.match_size = msize; | |
429 | ||
430 | *size += off; | |
431 | *dstptr += msize; | |
89566951 | 432 | return 0; |
9fa492cd PM |
433 | } |
434 | EXPORT_SYMBOL_GPL(xt_compat_match_from_user); | |
435 | ||
436 | int xt_compat_match_to_user(struct xt_entry_match *m, void __user **dstptr, | |
b0a6363c | 437 | unsigned int *size) |
9fa492cd | 438 | { |
5452e425 | 439 | const struct xt_match *match = m->u.kernel.match; |
9fa492cd PM |
440 | struct compat_xt_entry_match __user *cm = *dstptr; |
441 | int off = xt_compat_match_offset(match); | |
442 | u_int16_t msize = m->u.user.match_size - off; | |
443 | ||
444 | if (copy_to_user(cm, m, sizeof(*cm)) || | |
a18aa31b PM |
445 | put_user(msize, &cm->u.user.match_size) || |
446 | copy_to_user(cm->u.user.name, m->u.kernel.match->name, | |
447 | strlen(m->u.kernel.match->name) + 1)) | |
601e68e1 | 448 | return -EFAULT; |
9fa492cd PM |
449 | |
450 | if (match->compat_to_user) { | |
451 | if (match->compat_to_user((void __user *)cm->data, m->data)) | |
452 | return -EFAULT; | |
453 | } else { | |
454 | if (copy_to_user(cm->data, m->data, msize - sizeof(*cm))) | |
455 | return -EFAULT; | |
2722971c | 456 | } |
9fa492cd PM |
457 | |
458 | *size -= off; | |
459 | *dstptr += msize; | |
460 | return 0; | |
2722971c | 461 | } |
9fa492cd PM |
462 | EXPORT_SYMBOL_GPL(xt_compat_match_to_user); |
463 | #endif /* CONFIG_COMPAT */ | |
2722971c | 464 | |
37f9f733 PM |
465 | int xt_check_target(const struct xt_target *target, unsigned short family, |
466 | unsigned int size, const char *table, unsigned int hook_mask, | |
467 | unsigned short proto, int inv_proto) | |
468 | { | |
469 | if (XT_ALIGN(target->targetsize) != size) { | |
470 | printk("%s_tables: %s target: invalid size %Zu != %u\n", | |
471 | xt_prefix[family], target->name, | |
472 | XT_ALIGN(target->targetsize), size); | |
473 | return -EINVAL; | |
474 | } | |
475 | if (target->table && strcmp(target->table, table)) { | |
476 | printk("%s_tables: %s target: only valid in %s table, not %s\n", | |
477 | xt_prefix[family], target->name, target->table, table); | |
478 | return -EINVAL; | |
479 | } | |
480 | if (target->hooks && (hook_mask & ~target->hooks) != 0) { | |
5faf4153 BS |
481 | printk("%s_tables: %s target: bad hook_mask %u/%u\n", |
482 | xt_prefix[family], target->name, hook_mask, | |
483 | target->hooks); | |
37f9f733 PM |
484 | return -EINVAL; |
485 | } | |
486 | if (target->proto && (target->proto != proto || inv_proto)) { | |
487 | printk("%s_tables: %s target: only valid for protocol %u\n", | |
488 | xt_prefix[family], target->name, target->proto); | |
489 | return -EINVAL; | |
490 | } | |
491 | return 0; | |
492 | } | |
493 | EXPORT_SYMBOL_GPL(xt_check_target); | |
494 | ||
2722971c | 495 | #ifdef CONFIG_COMPAT |
5452e425 | 496 | int xt_compat_target_offset(const struct xt_target *target) |
2722971c | 497 | { |
9fa492cd PM |
498 | u_int16_t csize = target->compatsize ? : target->targetsize; |
499 | return XT_ALIGN(target->targetsize) - COMPAT_XT_ALIGN(csize); | |
500 | } | |
501 | EXPORT_SYMBOL_GPL(xt_compat_target_offset); | |
502 | ||
503 | void xt_compat_target_from_user(struct xt_entry_target *t, void **dstptr, | |
b0a6363c | 504 | unsigned int *size) |
9fa492cd | 505 | { |
5452e425 | 506 | const struct xt_target *target = t->u.kernel.target; |
9fa492cd PM |
507 | struct compat_xt_entry_target *ct = (struct compat_xt_entry_target *)t; |
508 | int pad, off = xt_compat_target_offset(target); | |
509 | u_int16_t tsize = ct->u.user.target_size; | |
510 | ||
511 | t = *dstptr; | |
512 | memcpy(t, ct, sizeof(*ct)); | |
513 | if (target->compat_from_user) | |
514 | target->compat_from_user(t->data, ct->data); | |
515 | else | |
516 | memcpy(t->data, ct->data, tsize - sizeof(*ct)); | |
517 | pad = XT_ALIGN(target->targetsize) - target->targetsize; | |
518 | if (pad > 0) | |
519 | memset(t->data + target->targetsize, 0, pad); | |
520 | ||
521 | tsize += off; | |
522 | t->u.user.target_size = tsize; | |
523 | ||
524 | *size += off; | |
525 | *dstptr += tsize; | |
526 | } | |
527 | EXPORT_SYMBOL_GPL(xt_compat_target_from_user); | |
528 | ||
529 | int xt_compat_target_to_user(struct xt_entry_target *t, void __user **dstptr, | |
b0a6363c | 530 | unsigned int *size) |
9fa492cd | 531 | { |
5452e425 | 532 | const struct xt_target *target = t->u.kernel.target; |
9fa492cd PM |
533 | struct compat_xt_entry_target __user *ct = *dstptr; |
534 | int off = xt_compat_target_offset(target); | |
535 | u_int16_t tsize = t->u.user.target_size - off; | |
536 | ||
537 | if (copy_to_user(ct, t, sizeof(*ct)) || | |
a18aa31b PM |
538 | put_user(tsize, &ct->u.user.target_size) || |
539 | copy_to_user(ct->u.user.name, t->u.kernel.target->name, | |
540 | strlen(t->u.kernel.target->name) + 1)) | |
601e68e1 | 541 | return -EFAULT; |
9fa492cd PM |
542 | |
543 | if (target->compat_to_user) { | |
544 | if (target->compat_to_user((void __user *)ct->data, t->data)) | |
545 | return -EFAULT; | |
546 | } else { | |
547 | if (copy_to_user(ct->data, t->data, tsize - sizeof(*ct))) | |
548 | return -EFAULT; | |
2722971c | 549 | } |
9fa492cd PM |
550 | |
551 | *size -= off; | |
552 | *dstptr += tsize; | |
553 | return 0; | |
2722971c | 554 | } |
9fa492cd | 555 | EXPORT_SYMBOL_GPL(xt_compat_target_to_user); |
2722971c DM |
556 | #endif |
557 | ||
2e4e6a17 HW |
558 | struct xt_table_info *xt_alloc_table_info(unsigned int size) |
559 | { | |
560 | struct xt_table_info *newinfo; | |
561 | int cpu; | |
562 | ||
563 | /* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */ | |
564 | if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > num_physpages) | |
565 | return NULL; | |
566 | ||
259d4e41 | 567 | newinfo = kzalloc(XT_TABLE_INFO_SZ, GFP_KERNEL); |
2e4e6a17 HW |
568 | if (!newinfo) |
569 | return NULL; | |
570 | ||
571 | newinfo->size = size; | |
572 | ||
6f912042 | 573 | for_each_possible_cpu(cpu) { |
2e4e6a17 HW |
574 | if (size <= PAGE_SIZE) |
575 | newinfo->entries[cpu] = kmalloc_node(size, | |
576 | GFP_KERNEL, | |
577 | cpu_to_node(cpu)); | |
578 | else | |
579 | newinfo->entries[cpu] = vmalloc_node(size, | |
580 | cpu_to_node(cpu)); | |
581 | ||
582 | if (newinfo->entries[cpu] == NULL) { | |
583 | xt_free_table_info(newinfo); | |
584 | return NULL; | |
585 | } | |
586 | } | |
587 | ||
588 | return newinfo; | |
589 | } | |
590 | EXPORT_SYMBOL(xt_alloc_table_info); | |
591 | ||
592 | void xt_free_table_info(struct xt_table_info *info) | |
593 | { | |
594 | int cpu; | |
595 | ||
6f912042 | 596 | for_each_possible_cpu(cpu) { |
2e4e6a17 HW |
597 | if (info->size <= PAGE_SIZE) |
598 | kfree(info->entries[cpu]); | |
599 | else | |
600 | vfree(info->entries[cpu]); | |
601 | } | |
602 | kfree(info); | |
603 | } | |
604 | EXPORT_SYMBOL(xt_free_table_info); | |
605 | ||
606 | /* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */ | |
76108cea JE |
607 | struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af, |
608 | const char *name) | |
2e4e6a17 HW |
609 | { |
610 | struct xt_table *t; | |
611 | ||
9e19bb6d | 612 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
2e4e6a17 HW |
613 | return ERR_PTR(-EINTR); |
614 | ||
8d870052 | 615 | list_for_each_entry(t, &net->xt.tables[af], list) |
2e4e6a17 HW |
616 | if (strcmp(t->name, name) == 0 && try_module_get(t->me)) |
617 | return t; | |
9e19bb6d | 618 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
619 | return NULL; |
620 | } | |
621 | EXPORT_SYMBOL_GPL(xt_find_table_lock); | |
622 | ||
623 | void xt_table_unlock(struct xt_table *table) | |
624 | { | |
9e19bb6d | 625 | mutex_unlock(&xt[table->af].mutex); |
2e4e6a17 HW |
626 | } |
627 | EXPORT_SYMBOL_GPL(xt_table_unlock); | |
628 | ||
2722971c | 629 | #ifdef CONFIG_COMPAT |
76108cea | 630 | void xt_compat_lock(u_int8_t af) |
2722971c DM |
631 | { |
632 | mutex_lock(&xt[af].compat_mutex); | |
633 | } | |
634 | EXPORT_SYMBOL_GPL(xt_compat_lock); | |
635 | ||
76108cea | 636 | void xt_compat_unlock(u_int8_t af) |
2722971c DM |
637 | { |
638 | mutex_unlock(&xt[af].compat_mutex); | |
639 | } | |
640 | EXPORT_SYMBOL_GPL(xt_compat_unlock); | |
641 | #endif | |
2e4e6a17 HW |
642 | |
643 | struct xt_table_info * | |
644 | xt_replace_table(struct xt_table *table, | |
645 | unsigned int num_counters, | |
646 | struct xt_table_info *newinfo, | |
647 | int *error) | |
648 | { | |
649 | struct xt_table_info *oldinfo, *private; | |
650 | ||
651 | /* Do the substitution. */ | |
652 | write_lock_bh(&table->lock); | |
653 | private = table->private; | |
654 | /* Check inside lock: is the old number correct? */ | |
655 | if (num_counters != private->number) { | |
656 | duprintf("num_counters != table->private->number (%u/%u)\n", | |
657 | num_counters, private->number); | |
658 | write_unlock_bh(&table->lock); | |
659 | *error = -EAGAIN; | |
660 | return NULL; | |
661 | } | |
662 | oldinfo = private; | |
663 | table->private = newinfo; | |
664 | newinfo->initial_entries = oldinfo->initial_entries; | |
665 | write_unlock_bh(&table->lock); | |
666 | ||
667 | return oldinfo; | |
668 | } | |
669 | EXPORT_SYMBOL_GPL(xt_replace_table); | |
670 | ||
8d870052 | 671 | struct xt_table *xt_register_table(struct net *net, struct xt_table *table, |
a98da11d AD |
672 | struct xt_table_info *bootstrap, |
673 | struct xt_table_info *newinfo) | |
2e4e6a17 HW |
674 | { |
675 | int ret; | |
676 | struct xt_table_info *private; | |
df0933dc | 677 | struct xt_table *t; |
2e4e6a17 | 678 | |
44d34e72 AD |
679 | /* Don't add one object to multiple lists. */ |
680 | table = kmemdup(table, sizeof(struct xt_table), GFP_KERNEL); | |
681 | if (!table) { | |
682 | ret = -ENOMEM; | |
683 | goto out; | |
684 | } | |
685 | ||
9e19bb6d | 686 | ret = mutex_lock_interruptible(&xt[table->af].mutex); |
2e4e6a17 | 687 | if (ret != 0) |
44d34e72 | 688 | goto out_free; |
2e4e6a17 HW |
689 | |
690 | /* Don't autoload: we'd eat our tail... */ | |
8d870052 | 691 | list_for_each_entry(t, &net->xt.tables[table->af], list) { |
df0933dc PM |
692 | if (strcmp(t->name, table->name) == 0) { |
693 | ret = -EEXIST; | |
694 | goto unlock; | |
695 | } | |
2e4e6a17 HW |
696 | } |
697 | ||
698 | /* Simplifies replace_table code. */ | |
699 | table->private = bootstrap; | |
91536b7a | 700 | rwlock_init(&table->lock); |
2e4e6a17 HW |
701 | if (!xt_replace_table(table, 0, newinfo, &ret)) |
702 | goto unlock; | |
703 | ||
704 | private = table->private; | |
705 | duprintf("table->private->number = %u\n", private->number); | |
706 | ||
707 | /* save number of initial entries */ | |
708 | private->initial_entries = private->number; | |
709 | ||
8d870052 | 710 | list_add(&table->list, &net->xt.tables[table->af]); |
a98da11d AD |
711 | mutex_unlock(&xt[table->af].mutex); |
712 | return table; | |
2e4e6a17 | 713 | |
2e4e6a17 | 714 | unlock: |
9e19bb6d | 715 | mutex_unlock(&xt[table->af].mutex); |
44d34e72 AD |
716 | out_free: |
717 | kfree(table); | |
a98da11d AD |
718 | out: |
719 | return ERR_PTR(ret); | |
2e4e6a17 HW |
720 | } |
721 | EXPORT_SYMBOL_GPL(xt_register_table); | |
722 | ||
723 | void *xt_unregister_table(struct xt_table *table) | |
724 | { | |
725 | struct xt_table_info *private; | |
726 | ||
9e19bb6d | 727 | mutex_lock(&xt[table->af].mutex); |
2e4e6a17 | 728 | private = table->private; |
df0933dc | 729 | list_del(&table->list); |
9e19bb6d | 730 | mutex_unlock(&xt[table->af].mutex); |
44d34e72 | 731 | kfree(table); |
2e4e6a17 HW |
732 | |
733 | return private; | |
734 | } | |
735 | EXPORT_SYMBOL_GPL(xt_unregister_table); | |
736 | ||
737 | #ifdef CONFIG_PROC_FS | |
715cf35a AD |
738 | struct xt_names_priv { |
739 | struct seq_net_private p; | |
76108cea | 740 | u_int8_t af; |
715cf35a | 741 | }; |
025d93d1 | 742 | static void *xt_table_seq_start(struct seq_file *seq, loff_t *pos) |
2e4e6a17 | 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 | |
025d93d1 | 748 | mutex_lock(&xt[af].mutex); |
715cf35a | 749 | return seq_list_start(&net->xt.tables[af], *pos); |
025d93d1 | 750 | } |
2e4e6a17 | 751 | |
025d93d1 AD |
752 | static void *xt_table_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
753 | { | |
715cf35a | 754 | struct xt_names_priv *priv = seq->private; |
1218854a | 755 | struct net *net = seq_file_net(seq); |
76108cea | 756 | u_int8_t af = priv->af; |
2e4e6a17 | 757 | |
715cf35a | 758 | return seq_list_next(v, &net->xt.tables[af], pos); |
2e4e6a17 HW |
759 | } |
760 | ||
025d93d1 | 761 | static void xt_table_seq_stop(struct seq_file *seq, void *v) |
2e4e6a17 | 762 | { |
715cf35a | 763 | struct xt_names_priv *priv = seq->private; |
76108cea | 764 | u_int8_t af = priv->af; |
2e4e6a17 | 765 | |
025d93d1 AD |
766 | mutex_unlock(&xt[af].mutex); |
767 | } | |
2e4e6a17 | 768 | |
025d93d1 AD |
769 | static int xt_table_seq_show(struct seq_file *seq, void *v) |
770 | { | |
771 | struct xt_table *table = list_entry(v, struct xt_table, list); | |
2e4e6a17 | 772 | |
025d93d1 AD |
773 | if (strlen(table->name)) |
774 | return seq_printf(seq, "%s\n", table->name); | |
775 | else | |
776 | return 0; | |
777 | } | |
601e68e1 | 778 | |
025d93d1 AD |
779 | static const struct seq_operations xt_table_seq_ops = { |
780 | .start = xt_table_seq_start, | |
781 | .next = xt_table_seq_next, | |
782 | .stop = xt_table_seq_stop, | |
783 | .show = xt_table_seq_show, | |
784 | }; | |
785 | ||
786 | static int xt_table_open(struct inode *inode, struct file *file) | |
787 | { | |
788 | int ret; | |
715cf35a | 789 | struct xt_names_priv *priv; |
025d93d1 | 790 | |
715cf35a AD |
791 | ret = seq_open_net(inode, file, &xt_table_seq_ops, |
792 | sizeof(struct xt_names_priv)); | |
025d93d1 | 793 | if (!ret) { |
715cf35a AD |
794 | priv = ((struct seq_file *)file->private_data)->private; |
795 | priv->af = (unsigned long)PDE(inode)->data; | |
025d93d1 AD |
796 | } |
797 | return ret; | |
2e4e6a17 HW |
798 | } |
799 | ||
025d93d1 AD |
800 | static const struct file_operations xt_table_ops = { |
801 | .owner = THIS_MODULE, | |
802 | .open = xt_table_open, | |
803 | .read = seq_read, | |
804 | .llseek = seq_lseek, | |
0e93bb94 | 805 | .release = seq_release_net, |
025d93d1 AD |
806 | }; |
807 | ||
808 | static void *xt_match_seq_start(struct seq_file *seq, loff_t *pos) | |
2e4e6a17 | 809 | { |
025d93d1 AD |
810 | struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private; |
811 | u_int16_t af = (unsigned long)pde->data; | |
2e4e6a17 | 812 | |
025d93d1 AD |
813 | mutex_lock(&xt[af].mutex); |
814 | return seq_list_start(&xt[af].match, *pos); | |
815 | } | |
601e68e1 | 816 | |
025d93d1 AD |
817 | static void *xt_match_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
818 | { | |
819 | struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private; | |
820 | u_int16_t af = (unsigned long)pde->data; | |
2e4e6a17 | 821 | |
025d93d1 | 822 | return seq_list_next(v, &xt[af].match, pos); |
2e4e6a17 HW |
823 | } |
824 | ||
025d93d1 | 825 | static void xt_match_seq_stop(struct seq_file *seq, void *v) |
2e4e6a17 HW |
826 | { |
827 | struct proc_dir_entry *pde = seq->private; | |
025d93d1 | 828 | u_int16_t af = (unsigned long)pde->data; |
2e4e6a17 | 829 | |
9e19bb6d | 830 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
831 | } |
832 | ||
025d93d1 | 833 | static int xt_match_seq_show(struct seq_file *seq, void *v) |
2e4e6a17 | 834 | { |
025d93d1 | 835 | struct xt_match *match = list_entry(v, struct xt_match, list); |
2e4e6a17 | 836 | |
025d93d1 AD |
837 | if (strlen(match->name)) |
838 | return seq_printf(seq, "%s\n", match->name); | |
2e4e6a17 HW |
839 | else |
840 | return 0; | |
841 | } | |
842 | ||
025d93d1 AD |
843 | static const struct seq_operations xt_match_seq_ops = { |
844 | .start = xt_match_seq_start, | |
845 | .next = xt_match_seq_next, | |
846 | .stop = xt_match_seq_stop, | |
847 | .show = xt_match_seq_show, | |
2e4e6a17 HW |
848 | }; |
849 | ||
025d93d1 | 850 | static int xt_match_open(struct inode *inode, struct file *file) |
2e4e6a17 HW |
851 | { |
852 | int ret; | |
853 | ||
025d93d1 | 854 | ret = seq_open(file, &xt_match_seq_ops); |
2e4e6a17 HW |
855 | if (!ret) { |
856 | struct seq_file *seq = file->private_data; | |
2e4e6a17 | 857 | |
025d93d1 | 858 | seq->private = PDE(inode); |
2e4e6a17 | 859 | } |
025d93d1 AD |
860 | return ret; |
861 | } | |
862 | ||
863 | static const struct file_operations xt_match_ops = { | |
864 | .owner = THIS_MODULE, | |
865 | .open = xt_match_open, | |
866 | .read = seq_read, | |
867 | .llseek = seq_lseek, | |
868 | .release = seq_release, | |
869 | }; | |
2e4e6a17 | 870 | |
025d93d1 AD |
871 | static void *xt_target_seq_start(struct seq_file *seq, loff_t *pos) |
872 | { | |
873 | struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private; | |
874 | u_int16_t af = (unsigned long)pde->data; | |
875 | ||
876 | mutex_lock(&xt[af].mutex); | |
877 | return seq_list_start(&xt[af].target, *pos); | |
878 | } | |
879 | ||
880 | static void *xt_target_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
881 | { | |
882 | struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private; | |
883 | u_int16_t af = (unsigned long)pde->data; | |
884 | ||
885 | return seq_list_next(v, &xt[af].target, pos); | |
886 | } | |
887 | ||
888 | static void xt_target_seq_stop(struct seq_file *seq, void *v) | |
889 | { | |
890 | struct proc_dir_entry *pde = seq->private; | |
891 | u_int16_t af = (unsigned long)pde->data; | |
892 | ||
893 | mutex_unlock(&xt[af].mutex); | |
894 | } | |
895 | ||
896 | static int xt_target_seq_show(struct seq_file *seq, void *v) | |
897 | { | |
898 | struct xt_target *target = list_entry(v, struct xt_target, list); | |
899 | ||
900 | if (strlen(target->name)) | |
901 | return seq_printf(seq, "%s\n", target->name); | |
902 | else | |
903 | return 0; | |
904 | } | |
905 | ||
906 | static const struct seq_operations xt_target_seq_ops = { | |
907 | .start = xt_target_seq_start, | |
908 | .next = xt_target_seq_next, | |
909 | .stop = xt_target_seq_stop, | |
910 | .show = xt_target_seq_show, | |
911 | }; | |
912 | ||
913 | static int xt_target_open(struct inode *inode, struct file *file) | |
914 | { | |
915 | int ret; | |
916 | ||
917 | ret = seq_open(file, &xt_target_seq_ops); | |
918 | if (!ret) { | |
919 | struct seq_file *seq = file->private_data; | |
920 | ||
921 | seq->private = PDE(inode); | |
922 | } | |
2e4e6a17 HW |
923 | return ret; |
924 | } | |
925 | ||
025d93d1 | 926 | static const struct file_operations xt_target_ops = { |
2e4e6a17 | 927 | .owner = THIS_MODULE, |
025d93d1 | 928 | .open = xt_target_open, |
2e4e6a17 HW |
929 | .read = seq_read, |
930 | .llseek = seq_lseek, | |
931 | .release = seq_release, | |
932 | }; | |
933 | ||
934 | #define FORMAT_TABLES "_tables_names" | |
935 | #define FORMAT_MATCHES "_tables_matches" | |
936 | #define FORMAT_TARGETS "_tables_targets" | |
937 | ||
938 | #endif /* CONFIG_PROC_FS */ | |
939 | ||
76108cea | 940 | int xt_proto_init(struct net *net, u_int8_t af) |
2e4e6a17 HW |
941 | { |
942 | #ifdef CONFIG_PROC_FS | |
943 | char buf[XT_FUNCTION_MAXNAMELEN]; | |
944 | struct proc_dir_entry *proc; | |
945 | #endif | |
946 | ||
7e9c6eeb | 947 | if (af >= ARRAY_SIZE(xt_prefix)) |
2e4e6a17 HW |
948 | return -EINVAL; |
949 | ||
950 | ||
951 | #ifdef CONFIG_PROC_FS | |
ce18afe5 | 952 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 953 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
8b169240 DL |
954 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_table_ops, |
955 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
956 | if (!proc) |
957 | goto out; | |
2e4e6a17 | 958 | |
ce18afe5 | 959 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 960 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
8b169240 DL |
961 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_match_ops, |
962 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
963 | if (!proc) |
964 | goto out_remove_tables; | |
2e4e6a17 | 965 | |
ce18afe5 | 966 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 967 | strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
8b169240 DL |
968 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_target_ops, |
969 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
970 | if (!proc) |
971 | goto out_remove_matches; | |
2e4e6a17 HW |
972 | #endif |
973 | ||
974 | return 0; | |
975 | ||
976 | #ifdef CONFIG_PROC_FS | |
977 | out_remove_matches: | |
ce18afe5 | 978 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 979 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
3cb609d5 | 980 | proc_net_remove(net, buf); |
2e4e6a17 HW |
981 | |
982 | out_remove_tables: | |
ce18afe5 | 983 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 984 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
3cb609d5 | 985 | proc_net_remove(net, buf); |
2e4e6a17 HW |
986 | out: |
987 | return -1; | |
988 | #endif | |
989 | } | |
990 | EXPORT_SYMBOL_GPL(xt_proto_init); | |
991 | ||
76108cea | 992 | void xt_proto_fini(struct net *net, u_int8_t af) |
2e4e6a17 HW |
993 | { |
994 | #ifdef CONFIG_PROC_FS | |
995 | char buf[XT_FUNCTION_MAXNAMELEN]; | |
996 | ||
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 | 1000 | |
ce18afe5 | 1001 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1002 | strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
3cb609d5 | 1003 | proc_net_remove(net, buf); |
2e4e6a17 | 1004 | |
ce18afe5 | 1005 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1006 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
3cb609d5 | 1007 | proc_net_remove(net, buf); |
2e4e6a17 HW |
1008 | #endif /*CONFIG_PROC_FS*/ |
1009 | } | |
1010 | EXPORT_SYMBOL_GPL(xt_proto_fini); | |
1011 | ||
8d870052 AD |
1012 | static int __net_init xt_net_init(struct net *net) |
1013 | { | |
1014 | int i; | |
1015 | ||
7e9c6eeb | 1016 | for (i = 0; i < NFPROTO_NUMPROTO; i++) |
8d870052 AD |
1017 | INIT_LIST_HEAD(&net->xt.tables[i]); |
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | static struct pernet_operations xt_net_ops = { | |
1022 | .init = xt_net_init, | |
1023 | }; | |
2e4e6a17 HW |
1024 | |
1025 | static int __init xt_init(void) | |
1026 | { | |
8d870052 | 1027 | int i, rv; |
2e4e6a17 | 1028 | |
7e9c6eeb | 1029 | xt = kmalloc(sizeof(struct xt_af) * NFPROTO_NUMPROTO, GFP_KERNEL); |
2e4e6a17 HW |
1030 | if (!xt) |
1031 | return -ENOMEM; | |
1032 | ||
7e9c6eeb | 1033 | for (i = 0; i < NFPROTO_NUMPROTO; i++) { |
9e19bb6d | 1034 | mutex_init(&xt[i].mutex); |
2722971c DM |
1035 | #ifdef CONFIG_COMPAT |
1036 | mutex_init(&xt[i].compat_mutex); | |
b386d9f5 | 1037 | xt[i].compat_offsets = NULL; |
2722971c | 1038 | #endif |
2e4e6a17 HW |
1039 | INIT_LIST_HEAD(&xt[i].target); |
1040 | INIT_LIST_HEAD(&xt[i].match); | |
2e4e6a17 | 1041 | } |
8d870052 AD |
1042 | rv = register_pernet_subsys(&xt_net_ops); |
1043 | if (rv < 0) | |
1044 | kfree(xt); | |
1045 | return rv; | |
2e4e6a17 HW |
1046 | } |
1047 | ||
1048 | static void __exit xt_fini(void) | |
1049 | { | |
8d870052 | 1050 | unregister_pernet_subsys(&xt_net_ops); |
2e4e6a17 HW |
1051 | kfree(xt); |
1052 | } | |
1053 | ||
1054 | module_init(xt_init); | |
1055 | module_exit(xt_fini); | |
1056 |