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 | } | |
656caff2 PM |
276 | |
277 | if (af != NFPROTO_UNSPEC && !have_rev) | |
278 | return match_revfn(NFPROTO_UNSPEC, name, revision, bestp); | |
279 | ||
2e4e6a17 HW |
280 | return have_rev; |
281 | } | |
282 | ||
76108cea | 283 | static int target_revfn(u8 af, const char *name, u8 revision, int *bestp) |
2e4e6a17 | 284 | { |
5452e425 | 285 | const struct xt_target *t; |
2e4e6a17 HW |
286 | int have_rev = 0; |
287 | ||
288 | list_for_each_entry(t, &xt[af].target, list) { | |
289 | if (strcmp(t->name, name) == 0) { | |
290 | if (t->revision > *bestp) | |
291 | *bestp = t->revision; | |
292 | if (t->revision == revision) | |
293 | have_rev = 1; | |
294 | } | |
295 | } | |
656caff2 PM |
296 | |
297 | if (af != NFPROTO_UNSPEC && !have_rev) | |
298 | return target_revfn(NFPROTO_UNSPEC, name, revision, bestp); | |
299 | ||
2e4e6a17 HW |
300 | return have_rev; |
301 | } | |
302 | ||
303 | /* Returns true or false (if no such extension at all) */ | |
76108cea | 304 | int xt_find_revision(u8 af, const char *name, u8 revision, int target, |
2e4e6a17 HW |
305 | int *err) |
306 | { | |
307 | int have_rev, best = -1; | |
308 | ||
9e19bb6d | 309 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) { |
2e4e6a17 HW |
310 | *err = -EINTR; |
311 | return 1; | |
312 | } | |
313 | if (target == 1) | |
314 | have_rev = target_revfn(af, name, revision, &best); | |
315 | else | |
316 | have_rev = match_revfn(af, name, revision, &best); | |
9e19bb6d | 317 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
318 | |
319 | /* Nothing at all? Return 0 to try loading module. */ | |
320 | if (best == -1) { | |
321 | *err = -ENOENT; | |
322 | return 0; | |
323 | } | |
324 | ||
325 | *err = best; | |
326 | if (!have_rev) | |
327 | *err = -EPROTONOSUPPORT; | |
328 | return 1; | |
329 | } | |
330 | EXPORT_SYMBOL_GPL(xt_find_revision); | |
331 | ||
45185364 JE |
332 | static char *textify_hooks(char *buf, size_t size, unsigned int mask) |
333 | { | |
334 | static const char *const names[] = { | |
335 | "PREROUTING", "INPUT", "FORWARD", | |
336 | "OUTPUT", "POSTROUTING", "BROUTING", | |
337 | }; | |
338 | unsigned int i; | |
339 | char *p = buf; | |
340 | bool np = false; | |
341 | int res; | |
342 | ||
343 | *p = '\0'; | |
344 | for (i = 0; i < ARRAY_SIZE(names); ++i) { | |
345 | if (!(mask & (1 << i))) | |
346 | continue; | |
347 | res = snprintf(p, size, "%s%s", np ? "/" : "", names[i]); | |
348 | if (res > 0) { | |
349 | size -= res; | |
350 | p += res; | |
351 | } | |
352 | np = true; | |
353 | } | |
354 | ||
355 | return buf; | |
356 | } | |
357 | ||
916a917d | 358 | int xt_check_match(struct xt_mtchk_param *par, |
9b4fce7a | 359 | unsigned int size, u_int8_t proto, bool inv_proto) |
37f9f733 | 360 | { |
9b4fce7a JE |
361 | if (XT_ALIGN(par->match->matchsize) != size && |
362 | par->match->matchsize != -1) { | |
043ef46c JE |
363 | /* |
364 | * ebt_among is exempt from centralized matchsize checking | |
365 | * because it uses a dynamic-size data set. | |
366 | */ | |
3dd5d7e3 | 367 | pr_err("%s_tables: %s match: invalid size %Zu != %u\n", |
916a917d | 368 | xt_prefix[par->family], par->match->name, |
9b4fce7a | 369 | XT_ALIGN(par->match->matchsize), size); |
37f9f733 PM |
370 | return -EINVAL; |
371 | } | |
9b4fce7a JE |
372 | if (par->match->table != NULL && |
373 | strcmp(par->match->table, par->table) != 0) { | |
3dd5d7e3 | 374 | pr_err("%s_tables: %s match: only valid in %s table, not %s\n", |
916a917d | 375 | xt_prefix[par->family], par->match->name, |
9b4fce7a | 376 | par->match->table, par->table); |
37f9f733 PM |
377 | return -EINVAL; |
378 | } | |
9b4fce7a | 379 | if (par->match->hooks && (par->hook_mask & ~par->match->hooks) != 0) { |
45185364 JE |
380 | char used[64], allow[64]; |
381 | ||
3dd5d7e3 | 382 | pr_err("%s_tables: %s match: used from hooks %s, but only " |
45185364 | 383 | "valid from %s\n", |
916a917d | 384 | xt_prefix[par->family], par->match->name, |
45185364 JE |
385 | textify_hooks(used, sizeof(used), par->hook_mask), |
386 | textify_hooks(allow, sizeof(allow), par->match->hooks)); | |
37f9f733 PM |
387 | return -EINVAL; |
388 | } | |
9b4fce7a | 389 | if (par->match->proto && (par->match->proto != proto || inv_proto)) { |
3dd5d7e3 | 390 | pr_err("%s_tables: %s match: only valid for protocol %u\n", |
916a917d JE |
391 | xt_prefix[par->family], par->match->name, |
392 | par->match->proto); | |
37f9f733 PM |
393 | return -EINVAL; |
394 | } | |
9b4fce7a | 395 | if (par->match->checkentry != NULL && !par->match->checkentry(par)) |
367c6790 | 396 | return -EINVAL; |
37f9f733 PM |
397 | return 0; |
398 | } | |
399 | EXPORT_SYMBOL_GPL(xt_check_match); | |
400 | ||
2722971c | 401 | #ifdef CONFIG_COMPAT |
76108cea | 402 | int xt_compat_add_offset(u_int8_t af, unsigned int offset, short delta) |
b386d9f5 PM |
403 | { |
404 | struct compat_delta *tmp; | |
405 | ||
406 | tmp = kmalloc(sizeof(struct compat_delta), GFP_KERNEL); | |
407 | if (!tmp) | |
408 | return -ENOMEM; | |
409 | ||
410 | tmp->offset = offset; | |
411 | tmp->delta = delta; | |
412 | ||
413 | if (xt[af].compat_offsets) { | |
414 | tmp->next = xt[af].compat_offsets->next; | |
415 | xt[af].compat_offsets->next = tmp; | |
416 | } else { | |
417 | xt[af].compat_offsets = tmp; | |
418 | tmp->next = NULL; | |
419 | } | |
420 | return 0; | |
421 | } | |
422 | EXPORT_SYMBOL_GPL(xt_compat_add_offset); | |
423 | ||
76108cea | 424 | void xt_compat_flush_offsets(u_int8_t af) |
b386d9f5 PM |
425 | { |
426 | struct compat_delta *tmp, *next; | |
427 | ||
428 | if (xt[af].compat_offsets) { | |
429 | for (tmp = xt[af].compat_offsets; tmp; tmp = next) { | |
430 | next = tmp->next; | |
431 | kfree(tmp); | |
432 | } | |
433 | xt[af].compat_offsets = NULL; | |
434 | } | |
435 | } | |
436 | EXPORT_SYMBOL_GPL(xt_compat_flush_offsets); | |
437 | ||
76108cea | 438 | short xt_compat_calc_jump(u_int8_t af, unsigned int offset) |
b386d9f5 PM |
439 | { |
440 | struct compat_delta *tmp; | |
441 | short delta; | |
442 | ||
443 | for (tmp = xt[af].compat_offsets, delta = 0; tmp; tmp = tmp->next) | |
444 | if (tmp->offset < offset) | |
445 | delta += tmp->delta; | |
446 | return delta; | |
447 | } | |
448 | EXPORT_SYMBOL_GPL(xt_compat_calc_jump); | |
449 | ||
5452e425 | 450 | int xt_compat_match_offset(const struct xt_match *match) |
2722971c | 451 | { |
9fa492cd PM |
452 | u_int16_t csize = match->compatsize ? : match->matchsize; |
453 | return XT_ALIGN(match->matchsize) - COMPAT_XT_ALIGN(csize); | |
454 | } | |
455 | EXPORT_SYMBOL_GPL(xt_compat_match_offset); | |
456 | ||
89566951 | 457 | int xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr, |
b0a6363c | 458 | unsigned int *size) |
9fa492cd | 459 | { |
5452e425 | 460 | const struct xt_match *match = m->u.kernel.match; |
9fa492cd PM |
461 | struct compat_xt_entry_match *cm = (struct compat_xt_entry_match *)m; |
462 | int pad, off = xt_compat_match_offset(match); | |
463 | u_int16_t msize = cm->u.user.match_size; | |
464 | ||
465 | m = *dstptr; | |
466 | memcpy(m, cm, sizeof(*cm)); | |
467 | if (match->compat_from_user) | |
468 | match->compat_from_user(m->data, cm->data); | |
469 | else | |
470 | memcpy(m->data, cm->data, msize - sizeof(*cm)); | |
471 | pad = XT_ALIGN(match->matchsize) - match->matchsize; | |
472 | if (pad > 0) | |
473 | memset(m->data + match->matchsize, 0, pad); | |
474 | ||
475 | msize += off; | |
476 | m->u.user.match_size = msize; | |
477 | ||
478 | *size += off; | |
479 | *dstptr += msize; | |
89566951 | 480 | return 0; |
9fa492cd PM |
481 | } |
482 | EXPORT_SYMBOL_GPL(xt_compat_match_from_user); | |
483 | ||
484 | int xt_compat_match_to_user(struct xt_entry_match *m, void __user **dstptr, | |
b0a6363c | 485 | unsigned int *size) |
9fa492cd | 486 | { |
5452e425 | 487 | const struct xt_match *match = m->u.kernel.match; |
9fa492cd PM |
488 | struct compat_xt_entry_match __user *cm = *dstptr; |
489 | int off = xt_compat_match_offset(match); | |
490 | u_int16_t msize = m->u.user.match_size - off; | |
491 | ||
492 | if (copy_to_user(cm, m, sizeof(*cm)) || | |
a18aa31b PM |
493 | put_user(msize, &cm->u.user.match_size) || |
494 | copy_to_user(cm->u.user.name, m->u.kernel.match->name, | |
495 | strlen(m->u.kernel.match->name) + 1)) | |
601e68e1 | 496 | return -EFAULT; |
9fa492cd PM |
497 | |
498 | if (match->compat_to_user) { | |
499 | if (match->compat_to_user((void __user *)cm->data, m->data)) | |
500 | return -EFAULT; | |
501 | } else { | |
502 | if (copy_to_user(cm->data, m->data, msize - sizeof(*cm))) | |
503 | return -EFAULT; | |
2722971c | 504 | } |
9fa492cd PM |
505 | |
506 | *size -= off; | |
507 | *dstptr += msize; | |
508 | return 0; | |
2722971c | 509 | } |
9fa492cd PM |
510 | EXPORT_SYMBOL_GPL(xt_compat_match_to_user); |
511 | #endif /* CONFIG_COMPAT */ | |
2722971c | 512 | |
916a917d | 513 | int xt_check_target(struct xt_tgchk_param *par, |
af5d6dc2 | 514 | unsigned int size, u_int8_t proto, bool inv_proto) |
37f9f733 | 515 | { |
af5d6dc2 | 516 | if (XT_ALIGN(par->target->targetsize) != size) { |
3dd5d7e3 | 517 | pr_err("%s_tables: %s target: invalid size %Zu != %u\n", |
916a917d | 518 | xt_prefix[par->family], par->target->name, |
af5d6dc2 | 519 | XT_ALIGN(par->target->targetsize), size); |
37f9f733 PM |
520 | return -EINVAL; |
521 | } | |
af5d6dc2 JE |
522 | if (par->target->table != NULL && |
523 | strcmp(par->target->table, par->table) != 0) { | |
3dd5d7e3 | 524 | pr_err("%s_tables: %s target: only valid in %s table, not %s\n", |
916a917d | 525 | xt_prefix[par->family], par->target->name, |
af5d6dc2 | 526 | par->target->table, par->table); |
37f9f733 PM |
527 | return -EINVAL; |
528 | } | |
af5d6dc2 | 529 | if (par->target->hooks && (par->hook_mask & ~par->target->hooks) != 0) { |
45185364 JE |
530 | char used[64], allow[64]; |
531 | ||
3dd5d7e3 | 532 | pr_err("%s_tables: %s target: used from hooks %s, but only " |
45185364 | 533 | "usable from %s\n", |
916a917d | 534 | xt_prefix[par->family], par->target->name, |
45185364 JE |
535 | textify_hooks(used, sizeof(used), par->hook_mask), |
536 | textify_hooks(allow, sizeof(allow), par->target->hooks)); | |
37f9f733 PM |
537 | return -EINVAL; |
538 | } | |
af5d6dc2 | 539 | if (par->target->proto && (par->target->proto != proto || inv_proto)) { |
3dd5d7e3 | 540 | pr_err("%s_tables: %s target: only valid for protocol %u\n", |
916a917d | 541 | xt_prefix[par->family], par->target->name, |
af5d6dc2 | 542 | par->target->proto); |
37f9f733 PM |
543 | return -EINVAL; |
544 | } | |
af5d6dc2 | 545 | if (par->target->checkentry != NULL && !par->target->checkentry(par)) |
367c6790 | 546 | return -EINVAL; |
37f9f733 PM |
547 | return 0; |
548 | } | |
549 | EXPORT_SYMBOL_GPL(xt_check_target); | |
550 | ||
2722971c | 551 | #ifdef CONFIG_COMPAT |
5452e425 | 552 | int xt_compat_target_offset(const struct xt_target *target) |
2722971c | 553 | { |
9fa492cd PM |
554 | u_int16_t csize = target->compatsize ? : target->targetsize; |
555 | return XT_ALIGN(target->targetsize) - COMPAT_XT_ALIGN(csize); | |
556 | } | |
557 | EXPORT_SYMBOL_GPL(xt_compat_target_offset); | |
558 | ||
559 | void xt_compat_target_from_user(struct xt_entry_target *t, void **dstptr, | |
b0a6363c | 560 | unsigned int *size) |
9fa492cd | 561 | { |
5452e425 | 562 | const struct xt_target *target = t->u.kernel.target; |
9fa492cd PM |
563 | struct compat_xt_entry_target *ct = (struct compat_xt_entry_target *)t; |
564 | int pad, off = xt_compat_target_offset(target); | |
565 | u_int16_t tsize = ct->u.user.target_size; | |
566 | ||
567 | t = *dstptr; | |
568 | memcpy(t, ct, sizeof(*ct)); | |
569 | if (target->compat_from_user) | |
570 | target->compat_from_user(t->data, ct->data); | |
571 | else | |
572 | memcpy(t->data, ct->data, tsize - sizeof(*ct)); | |
573 | pad = XT_ALIGN(target->targetsize) - target->targetsize; | |
574 | if (pad > 0) | |
575 | memset(t->data + target->targetsize, 0, pad); | |
576 | ||
577 | tsize += off; | |
578 | t->u.user.target_size = tsize; | |
579 | ||
580 | *size += off; | |
581 | *dstptr += tsize; | |
582 | } | |
583 | EXPORT_SYMBOL_GPL(xt_compat_target_from_user); | |
584 | ||
585 | int xt_compat_target_to_user(struct xt_entry_target *t, void __user **dstptr, | |
b0a6363c | 586 | unsigned int *size) |
9fa492cd | 587 | { |
5452e425 | 588 | const struct xt_target *target = t->u.kernel.target; |
9fa492cd PM |
589 | struct compat_xt_entry_target __user *ct = *dstptr; |
590 | int off = xt_compat_target_offset(target); | |
591 | u_int16_t tsize = t->u.user.target_size - off; | |
592 | ||
593 | if (copy_to_user(ct, t, sizeof(*ct)) || | |
a18aa31b PM |
594 | put_user(tsize, &ct->u.user.target_size) || |
595 | copy_to_user(ct->u.user.name, t->u.kernel.target->name, | |
596 | strlen(t->u.kernel.target->name) + 1)) | |
601e68e1 | 597 | return -EFAULT; |
9fa492cd PM |
598 | |
599 | if (target->compat_to_user) { | |
600 | if (target->compat_to_user((void __user *)ct->data, t->data)) | |
601 | return -EFAULT; | |
602 | } else { | |
603 | if (copy_to_user(ct->data, t->data, tsize - sizeof(*ct))) | |
604 | return -EFAULT; | |
2722971c | 605 | } |
9fa492cd PM |
606 | |
607 | *size -= off; | |
608 | *dstptr += tsize; | |
609 | return 0; | |
2722971c | 610 | } |
9fa492cd | 611 | EXPORT_SYMBOL_GPL(xt_compat_target_to_user); |
2722971c DM |
612 | #endif |
613 | ||
2e4e6a17 HW |
614 | struct xt_table_info *xt_alloc_table_info(unsigned int size) |
615 | { | |
616 | struct xt_table_info *newinfo; | |
617 | int cpu; | |
618 | ||
619 | /* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */ | |
620 | if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > num_physpages) | |
621 | return NULL; | |
622 | ||
259d4e41 | 623 | newinfo = kzalloc(XT_TABLE_INFO_SZ, GFP_KERNEL); |
2e4e6a17 HW |
624 | if (!newinfo) |
625 | return NULL; | |
626 | ||
627 | newinfo->size = size; | |
628 | ||
6f912042 | 629 | for_each_possible_cpu(cpu) { |
2e4e6a17 HW |
630 | if (size <= PAGE_SIZE) |
631 | newinfo->entries[cpu] = kmalloc_node(size, | |
632 | GFP_KERNEL, | |
633 | cpu_to_node(cpu)); | |
634 | else | |
635 | newinfo->entries[cpu] = vmalloc_node(size, | |
636 | cpu_to_node(cpu)); | |
637 | ||
638 | if (newinfo->entries[cpu] == NULL) { | |
639 | xt_free_table_info(newinfo); | |
640 | return NULL; | |
641 | } | |
642 | } | |
643 | ||
644 | return newinfo; | |
645 | } | |
646 | EXPORT_SYMBOL(xt_alloc_table_info); | |
647 | ||
648 | void xt_free_table_info(struct xt_table_info *info) | |
649 | { | |
650 | int cpu; | |
651 | ||
6f912042 | 652 | for_each_possible_cpu(cpu) { |
2e4e6a17 HW |
653 | if (info->size <= PAGE_SIZE) |
654 | kfree(info->entries[cpu]); | |
655 | else | |
656 | vfree(info->entries[cpu]); | |
657 | } | |
658 | kfree(info); | |
659 | } | |
660 | EXPORT_SYMBOL(xt_free_table_info); | |
661 | ||
662 | /* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */ | |
76108cea JE |
663 | struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af, |
664 | const char *name) | |
2e4e6a17 HW |
665 | { |
666 | struct xt_table *t; | |
667 | ||
9e19bb6d | 668 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
2e4e6a17 HW |
669 | return ERR_PTR(-EINTR); |
670 | ||
8d870052 | 671 | list_for_each_entry(t, &net->xt.tables[af], list) |
2e4e6a17 HW |
672 | if (strcmp(t->name, name) == 0 && try_module_get(t->me)) |
673 | return t; | |
9e19bb6d | 674 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
675 | return NULL; |
676 | } | |
677 | EXPORT_SYMBOL_GPL(xt_find_table_lock); | |
678 | ||
679 | void xt_table_unlock(struct xt_table *table) | |
680 | { | |
9e19bb6d | 681 | mutex_unlock(&xt[table->af].mutex); |
2e4e6a17 HW |
682 | } |
683 | EXPORT_SYMBOL_GPL(xt_table_unlock); | |
684 | ||
2722971c | 685 | #ifdef CONFIG_COMPAT |
76108cea | 686 | void xt_compat_lock(u_int8_t af) |
2722971c DM |
687 | { |
688 | mutex_lock(&xt[af].compat_mutex); | |
689 | } | |
690 | EXPORT_SYMBOL_GPL(xt_compat_lock); | |
691 | ||
76108cea | 692 | void xt_compat_unlock(u_int8_t af) |
2722971c DM |
693 | { |
694 | mutex_unlock(&xt[af].compat_mutex); | |
695 | } | |
696 | EXPORT_SYMBOL_GPL(xt_compat_unlock); | |
697 | #endif | |
2e4e6a17 | 698 | |
942e4a2b SH |
699 | DEFINE_PER_CPU(struct xt_info_lock, xt_info_locks); |
700 | EXPORT_PER_CPU_SYMBOL_GPL(xt_info_locks); | |
701 | ||
702 | ||
2e4e6a17 HW |
703 | struct xt_table_info * |
704 | xt_replace_table(struct xt_table *table, | |
705 | unsigned int num_counters, | |
706 | struct xt_table_info *newinfo, | |
707 | int *error) | |
708 | { | |
942e4a2b | 709 | struct xt_table_info *private; |
2e4e6a17 HW |
710 | |
711 | /* Do the substitution. */ | |
942e4a2b | 712 | local_bh_disable(); |
2e4e6a17 | 713 | private = table->private; |
942e4a2b | 714 | |
2e4e6a17 HW |
715 | /* Check inside lock: is the old number correct? */ |
716 | if (num_counters != private->number) { | |
717 | duprintf("num_counters != table->private->number (%u/%u)\n", | |
718 | num_counters, private->number); | |
942e4a2b | 719 | local_bh_enable(); |
2e4e6a17 HW |
720 | *error = -EAGAIN; |
721 | return NULL; | |
722 | } | |
2e4e6a17 | 723 | |
942e4a2b SH |
724 | table->private = newinfo; |
725 | newinfo->initial_entries = private->initial_entries; | |
726 | ||
727 | /* | |
728 | * Even though table entries have now been swapped, other CPU's | |
729 | * may still be using the old entries. This is okay, because | |
730 | * resynchronization happens because of the locking done | |
731 | * during the get_counters() routine. | |
732 | */ | |
733 | local_bh_enable(); | |
734 | ||
735 | return private; | |
2e4e6a17 HW |
736 | } |
737 | EXPORT_SYMBOL_GPL(xt_replace_table); | |
738 | ||
8d870052 | 739 | struct xt_table *xt_register_table(struct net *net, struct xt_table *table, |
a98da11d AD |
740 | struct xt_table_info *bootstrap, |
741 | struct xt_table_info *newinfo) | |
2e4e6a17 HW |
742 | { |
743 | int ret; | |
744 | struct xt_table_info *private; | |
df0933dc | 745 | struct xt_table *t; |
2e4e6a17 | 746 | |
44d34e72 AD |
747 | /* Don't add one object to multiple lists. */ |
748 | table = kmemdup(table, sizeof(struct xt_table), GFP_KERNEL); | |
749 | if (!table) { | |
750 | ret = -ENOMEM; | |
751 | goto out; | |
752 | } | |
753 | ||
9e19bb6d | 754 | ret = mutex_lock_interruptible(&xt[table->af].mutex); |
2e4e6a17 | 755 | if (ret != 0) |
44d34e72 | 756 | goto out_free; |
2e4e6a17 HW |
757 | |
758 | /* Don't autoload: we'd eat our tail... */ | |
8d870052 | 759 | list_for_each_entry(t, &net->xt.tables[table->af], list) { |
df0933dc PM |
760 | if (strcmp(t->name, table->name) == 0) { |
761 | ret = -EEXIST; | |
762 | goto unlock; | |
763 | } | |
2e4e6a17 HW |
764 | } |
765 | ||
766 | /* Simplifies replace_table code. */ | |
767 | table->private = bootstrap; | |
78454473 | 768 | |
2e4e6a17 HW |
769 | if (!xt_replace_table(table, 0, newinfo, &ret)) |
770 | goto unlock; | |
771 | ||
772 | private = table->private; | |
773 | duprintf("table->private->number = %u\n", private->number); | |
774 | ||
775 | /* save number of initial entries */ | |
776 | private->initial_entries = private->number; | |
777 | ||
8d870052 | 778 | list_add(&table->list, &net->xt.tables[table->af]); |
a98da11d AD |
779 | mutex_unlock(&xt[table->af].mutex); |
780 | return table; | |
2e4e6a17 | 781 | |
2e4e6a17 | 782 | unlock: |
9e19bb6d | 783 | mutex_unlock(&xt[table->af].mutex); |
44d34e72 AD |
784 | out_free: |
785 | kfree(table); | |
a98da11d AD |
786 | out: |
787 | return ERR_PTR(ret); | |
2e4e6a17 HW |
788 | } |
789 | EXPORT_SYMBOL_GPL(xt_register_table); | |
790 | ||
791 | void *xt_unregister_table(struct xt_table *table) | |
792 | { | |
793 | struct xt_table_info *private; | |
794 | ||
9e19bb6d | 795 | mutex_lock(&xt[table->af].mutex); |
2e4e6a17 | 796 | private = table->private; |
df0933dc | 797 | list_del(&table->list); |
9e19bb6d | 798 | mutex_unlock(&xt[table->af].mutex); |
44d34e72 | 799 | kfree(table); |
2e4e6a17 HW |
800 | |
801 | return private; | |
802 | } | |
803 | EXPORT_SYMBOL_GPL(xt_unregister_table); | |
804 | ||
805 | #ifdef CONFIG_PROC_FS | |
715cf35a AD |
806 | struct xt_names_priv { |
807 | struct seq_net_private p; | |
76108cea | 808 | u_int8_t af; |
715cf35a | 809 | }; |
025d93d1 | 810 | static void *xt_table_seq_start(struct seq_file *seq, loff_t *pos) |
2e4e6a17 | 811 | { |
715cf35a | 812 | struct xt_names_priv *priv = seq->private; |
1218854a | 813 | struct net *net = seq_file_net(seq); |
76108cea | 814 | u_int8_t af = priv->af; |
2e4e6a17 | 815 | |
025d93d1 | 816 | mutex_lock(&xt[af].mutex); |
715cf35a | 817 | return seq_list_start(&net->xt.tables[af], *pos); |
025d93d1 | 818 | } |
2e4e6a17 | 819 | |
025d93d1 AD |
820 | static void *xt_table_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
821 | { | |
715cf35a | 822 | struct xt_names_priv *priv = seq->private; |
1218854a | 823 | struct net *net = seq_file_net(seq); |
76108cea | 824 | u_int8_t af = priv->af; |
2e4e6a17 | 825 | |
715cf35a | 826 | return seq_list_next(v, &net->xt.tables[af], pos); |
2e4e6a17 HW |
827 | } |
828 | ||
025d93d1 | 829 | static void xt_table_seq_stop(struct seq_file *seq, void *v) |
2e4e6a17 | 830 | { |
715cf35a | 831 | struct xt_names_priv *priv = seq->private; |
76108cea | 832 | u_int8_t af = priv->af; |
2e4e6a17 | 833 | |
025d93d1 AD |
834 | mutex_unlock(&xt[af].mutex); |
835 | } | |
2e4e6a17 | 836 | |
025d93d1 AD |
837 | static int xt_table_seq_show(struct seq_file *seq, void *v) |
838 | { | |
839 | struct xt_table *table = list_entry(v, struct xt_table, list); | |
2e4e6a17 | 840 | |
025d93d1 AD |
841 | if (strlen(table->name)) |
842 | return seq_printf(seq, "%s\n", table->name); | |
843 | else | |
844 | return 0; | |
845 | } | |
601e68e1 | 846 | |
025d93d1 AD |
847 | static const struct seq_operations xt_table_seq_ops = { |
848 | .start = xt_table_seq_start, | |
849 | .next = xt_table_seq_next, | |
850 | .stop = xt_table_seq_stop, | |
851 | .show = xt_table_seq_show, | |
852 | }; | |
853 | ||
854 | static int xt_table_open(struct inode *inode, struct file *file) | |
855 | { | |
856 | int ret; | |
715cf35a | 857 | struct xt_names_priv *priv; |
025d93d1 | 858 | |
715cf35a AD |
859 | ret = seq_open_net(inode, file, &xt_table_seq_ops, |
860 | sizeof(struct xt_names_priv)); | |
025d93d1 | 861 | if (!ret) { |
715cf35a AD |
862 | priv = ((struct seq_file *)file->private_data)->private; |
863 | priv->af = (unsigned long)PDE(inode)->data; | |
025d93d1 AD |
864 | } |
865 | return ret; | |
2e4e6a17 HW |
866 | } |
867 | ||
025d93d1 AD |
868 | static const struct file_operations xt_table_ops = { |
869 | .owner = THIS_MODULE, | |
870 | .open = xt_table_open, | |
871 | .read = seq_read, | |
872 | .llseek = seq_lseek, | |
0e93bb94 | 873 | .release = seq_release_net, |
025d93d1 AD |
874 | }; |
875 | ||
eb132205 JE |
876 | /* |
877 | * Traverse state for ip{,6}_{tables,matches} for helping crossing | |
878 | * the multi-AF mutexes. | |
879 | */ | |
880 | struct nf_mttg_trav { | |
881 | struct list_head *head, *curr; | |
882 | uint8_t class, nfproto; | |
883 | }; | |
884 | ||
885 | enum { | |
886 | MTTG_TRAV_INIT, | |
887 | MTTG_TRAV_NFP_UNSPEC, | |
888 | MTTG_TRAV_NFP_SPEC, | |
889 | MTTG_TRAV_DONE, | |
890 | }; | |
891 | ||
892 | static void *xt_mttg_seq_next(struct seq_file *seq, void *v, loff_t *ppos, | |
893 | bool is_target) | |
2e4e6a17 | 894 | { |
eb132205 JE |
895 | static const uint8_t next_class[] = { |
896 | [MTTG_TRAV_NFP_UNSPEC] = MTTG_TRAV_NFP_SPEC, | |
897 | [MTTG_TRAV_NFP_SPEC] = MTTG_TRAV_DONE, | |
898 | }; | |
899 | struct nf_mttg_trav *trav = seq->private; | |
900 | ||
901 | switch (trav->class) { | |
902 | case MTTG_TRAV_INIT: | |
903 | trav->class = MTTG_TRAV_NFP_UNSPEC; | |
904 | mutex_lock(&xt[NFPROTO_UNSPEC].mutex); | |
905 | trav->head = trav->curr = is_target ? | |
906 | &xt[NFPROTO_UNSPEC].target : &xt[NFPROTO_UNSPEC].match; | |
907 | break; | |
908 | case MTTG_TRAV_NFP_UNSPEC: | |
909 | trav->curr = trav->curr->next; | |
910 | if (trav->curr != trav->head) | |
911 | break; | |
912 | mutex_unlock(&xt[NFPROTO_UNSPEC].mutex); | |
913 | mutex_lock(&xt[trav->nfproto].mutex); | |
914 | trav->head = trav->curr = is_target ? | |
915 | &xt[trav->nfproto].target : &xt[trav->nfproto].match; | |
916 | trav->class = next_class[trav->class]; | |
917 | break; | |
918 | case MTTG_TRAV_NFP_SPEC: | |
919 | trav->curr = trav->curr->next; | |
920 | if (trav->curr != trav->head) | |
921 | break; | |
922 | /* fallthru, _stop will unlock */ | |
923 | default: | |
924 | return NULL; | |
925 | } | |
2e4e6a17 | 926 | |
eb132205 JE |
927 | if (ppos != NULL) |
928 | ++*ppos; | |
929 | return trav; | |
025d93d1 | 930 | } |
601e68e1 | 931 | |
eb132205 JE |
932 | static void *xt_mttg_seq_start(struct seq_file *seq, loff_t *pos, |
933 | bool is_target) | |
025d93d1 | 934 | { |
eb132205 JE |
935 | struct nf_mttg_trav *trav = seq->private; |
936 | unsigned int j; | |
2e4e6a17 | 937 | |
eb132205 JE |
938 | trav->class = MTTG_TRAV_INIT; |
939 | for (j = 0; j < *pos; ++j) | |
940 | if (xt_mttg_seq_next(seq, NULL, NULL, is_target) == NULL) | |
941 | return NULL; | |
942 | return trav; | |
2e4e6a17 HW |
943 | } |
944 | ||
eb132205 | 945 | static void xt_mttg_seq_stop(struct seq_file *seq, void *v) |
2e4e6a17 | 946 | { |
eb132205 JE |
947 | struct nf_mttg_trav *trav = seq->private; |
948 | ||
949 | switch (trav->class) { | |
950 | case MTTG_TRAV_NFP_UNSPEC: | |
951 | mutex_unlock(&xt[NFPROTO_UNSPEC].mutex); | |
952 | break; | |
953 | case MTTG_TRAV_NFP_SPEC: | |
954 | mutex_unlock(&xt[trav->nfproto].mutex); | |
955 | break; | |
956 | } | |
957 | } | |
2e4e6a17 | 958 | |
eb132205 JE |
959 | static void *xt_match_seq_start(struct seq_file *seq, loff_t *pos) |
960 | { | |
961 | return xt_mttg_seq_start(seq, pos, false); | |
2e4e6a17 HW |
962 | } |
963 | ||
eb132205 | 964 | static void *xt_match_seq_next(struct seq_file *seq, void *v, loff_t *ppos) |
2e4e6a17 | 965 | { |
eb132205 JE |
966 | return xt_mttg_seq_next(seq, v, ppos, false); |
967 | } | |
2e4e6a17 | 968 | |
eb132205 JE |
969 | static int xt_match_seq_show(struct seq_file *seq, void *v) |
970 | { | |
971 | const struct nf_mttg_trav *trav = seq->private; | |
972 | const struct xt_match *match; | |
973 | ||
974 | switch (trav->class) { | |
975 | case MTTG_TRAV_NFP_UNSPEC: | |
976 | case MTTG_TRAV_NFP_SPEC: | |
977 | if (trav->curr == trav->head) | |
978 | return 0; | |
979 | match = list_entry(trav->curr, struct xt_match, list); | |
980 | return (*match->name == '\0') ? 0 : | |
981 | seq_printf(seq, "%s\n", match->name); | |
982 | } | |
983 | return 0; | |
2e4e6a17 HW |
984 | } |
985 | ||
025d93d1 AD |
986 | static const struct seq_operations xt_match_seq_ops = { |
987 | .start = xt_match_seq_start, | |
988 | .next = xt_match_seq_next, | |
eb132205 | 989 | .stop = xt_mttg_seq_stop, |
025d93d1 | 990 | .show = xt_match_seq_show, |
2e4e6a17 HW |
991 | }; |
992 | ||
025d93d1 | 993 | static int xt_match_open(struct inode *inode, struct file *file) |
2e4e6a17 | 994 | { |
eb132205 JE |
995 | struct seq_file *seq; |
996 | struct nf_mttg_trav *trav; | |
2e4e6a17 HW |
997 | int ret; |
998 | ||
eb132205 JE |
999 | trav = kmalloc(sizeof(*trav), GFP_KERNEL); |
1000 | if (trav == NULL) | |
1001 | return -ENOMEM; | |
2e4e6a17 | 1002 | |
eb132205 JE |
1003 | ret = seq_open(file, &xt_match_seq_ops); |
1004 | if (ret < 0) { | |
1005 | kfree(trav); | |
1006 | return ret; | |
2e4e6a17 | 1007 | } |
eb132205 JE |
1008 | |
1009 | seq = file->private_data; | |
1010 | seq->private = trav; | |
1011 | trav->nfproto = (unsigned long)PDE(inode)->data; | |
1012 | return 0; | |
025d93d1 AD |
1013 | } |
1014 | ||
1015 | static const struct file_operations xt_match_ops = { | |
1016 | .owner = THIS_MODULE, | |
1017 | .open = xt_match_open, | |
1018 | .read = seq_read, | |
1019 | .llseek = seq_lseek, | |
eb132205 | 1020 | .release = seq_release_private, |
025d93d1 | 1021 | }; |
2e4e6a17 | 1022 | |
025d93d1 AD |
1023 | static void *xt_target_seq_start(struct seq_file *seq, loff_t *pos) |
1024 | { | |
eb132205 | 1025 | return xt_mttg_seq_start(seq, pos, true); |
025d93d1 AD |
1026 | } |
1027 | ||
eb132205 | 1028 | static void *xt_target_seq_next(struct seq_file *seq, void *v, loff_t *ppos) |
025d93d1 | 1029 | { |
eb132205 | 1030 | return xt_mttg_seq_next(seq, v, ppos, true); |
025d93d1 AD |
1031 | } |
1032 | ||
1033 | static int xt_target_seq_show(struct seq_file *seq, void *v) | |
1034 | { | |
eb132205 JE |
1035 | const struct nf_mttg_trav *trav = seq->private; |
1036 | const struct xt_target *target; | |
1037 | ||
1038 | switch (trav->class) { | |
1039 | case MTTG_TRAV_NFP_UNSPEC: | |
1040 | case MTTG_TRAV_NFP_SPEC: | |
1041 | if (trav->curr == trav->head) | |
1042 | return 0; | |
1043 | target = list_entry(trav->curr, struct xt_target, list); | |
1044 | return (*target->name == '\0') ? 0 : | |
1045 | seq_printf(seq, "%s\n", target->name); | |
1046 | } | |
1047 | return 0; | |
025d93d1 AD |
1048 | } |
1049 | ||
1050 | static const struct seq_operations xt_target_seq_ops = { | |
1051 | .start = xt_target_seq_start, | |
1052 | .next = xt_target_seq_next, | |
eb132205 | 1053 | .stop = xt_mttg_seq_stop, |
025d93d1 AD |
1054 | .show = xt_target_seq_show, |
1055 | }; | |
1056 | ||
1057 | static int xt_target_open(struct inode *inode, struct file *file) | |
1058 | { | |
eb132205 JE |
1059 | struct seq_file *seq; |
1060 | struct nf_mttg_trav *trav; | |
025d93d1 AD |
1061 | int ret; |
1062 | ||
eb132205 JE |
1063 | trav = kmalloc(sizeof(*trav), GFP_KERNEL); |
1064 | if (trav == NULL) | |
1065 | return -ENOMEM; | |
025d93d1 | 1066 | |
eb132205 JE |
1067 | ret = seq_open(file, &xt_target_seq_ops); |
1068 | if (ret < 0) { | |
1069 | kfree(trav); | |
1070 | return ret; | |
025d93d1 | 1071 | } |
eb132205 JE |
1072 | |
1073 | seq = file->private_data; | |
1074 | seq->private = trav; | |
1075 | trav->nfproto = (unsigned long)PDE(inode)->data; | |
1076 | return 0; | |
2e4e6a17 HW |
1077 | } |
1078 | ||
025d93d1 | 1079 | static const struct file_operations xt_target_ops = { |
2e4e6a17 | 1080 | .owner = THIS_MODULE, |
025d93d1 | 1081 | .open = xt_target_open, |
2e4e6a17 HW |
1082 | .read = seq_read, |
1083 | .llseek = seq_lseek, | |
eb132205 | 1084 | .release = seq_release_private, |
2e4e6a17 HW |
1085 | }; |
1086 | ||
1087 | #define FORMAT_TABLES "_tables_names" | |
1088 | #define FORMAT_MATCHES "_tables_matches" | |
1089 | #define FORMAT_TARGETS "_tables_targets" | |
1090 | ||
1091 | #endif /* CONFIG_PROC_FS */ | |
1092 | ||
76108cea | 1093 | int xt_proto_init(struct net *net, u_int8_t af) |
2e4e6a17 HW |
1094 | { |
1095 | #ifdef CONFIG_PROC_FS | |
1096 | char buf[XT_FUNCTION_MAXNAMELEN]; | |
1097 | struct proc_dir_entry *proc; | |
1098 | #endif | |
1099 | ||
7e9c6eeb | 1100 | if (af >= ARRAY_SIZE(xt_prefix)) |
2e4e6a17 HW |
1101 | return -EINVAL; |
1102 | ||
1103 | ||
1104 | #ifdef CONFIG_PROC_FS | |
ce18afe5 | 1105 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1106 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
8b169240 DL |
1107 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_table_ops, |
1108 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
1109 | if (!proc) |
1110 | goto out; | |
2e4e6a17 | 1111 | |
ce18afe5 | 1112 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1113 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
8b169240 DL |
1114 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_match_ops, |
1115 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
1116 | if (!proc) |
1117 | goto out_remove_tables; | |
2e4e6a17 | 1118 | |
ce18afe5 | 1119 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1120 | strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
8b169240 DL |
1121 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_target_ops, |
1122 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
1123 | if (!proc) |
1124 | goto out_remove_matches; | |
2e4e6a17 HW |
1125 | #endif |
1126 | ||
1127 | return 0; | |
1128 | ||
1129 | #ifdef CONFIG_PROC_FS | |
1130 | out_remove_matches: | |
ce18afe5 | 1131 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1132 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
3cb609d5 | 1133 | proc_net_remove(net, buf); |
2e4e6a17 HW |
1134 | |
1135 | out_remove_tables: | |
ce18afe5 | 1136 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1137 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
3cb609d5 | 1138 | proc_net_remove(net, buf); |
2e4e6a17 HW |
1139 | out: |
1140 | return -1; | |
1141 | #endif | |
1142 | } | |
1143 | EXPORT_SYMBOL_GPL(xt_proto_init); | |
1144 | ||
76108cea | 1145 | void xt_proto_fini(struct net *net, u_int8_t af) |
2e4e6a17 HW |
1146 | { |
1147 | #ifdef CONFIG_PROC_FS | |
1148 | char buf[XT_FUNCTION_MAXNAMELEN]; | |
1149 | ||
ce18afe5 | 1150 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1151 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
3cb609d5 | 1152 | proc_net_remove(net, buf); |
2e4e6a17 | 1153 | |
ce18afe5 | 1154 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1155 | strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
3cb609d5 | 1156 | proc_net_remove(net, buf); |
2e4e6a17 | 1157 | |
ce18afe5 | 1158 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1159 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
3cb609d5 | 1160 | proc_net_remove(net, buf); |
2e4e6a17 HW |
1161 | #endif /*CONFIG_PROC_FS*/ |
1162 | } | |
1163 | EXPORT_SYMBOL_GPL(xt_proto_fini); | |
1164 | ||
8d870052 AD |
1165 | static int __net_init xt_net_init(struct net *net) |
1166 | { | |
1167 | int i; | |
1168 | ||
7e9c6eeb | 1169 | for (i = 0; i < NFPROTO_NUMPROTO; i++) |
8d870052 AD |
1170 | INIT_LIST_HEAD(&net->xt.tables[i]); |
1171 | return 0; | |
1172 | } | |
1173 | ||
1174 | static struct pernet_operations xt_net_ops = { | |
1175 | .init = xt_net_init, | |
1176 | }; | |
2e4e6a17 HW |
1177 | |
1178 | static int __init xt_init(void) | |
1179 | { | |
942e4a2b SH |
1180 | unsigned int i; |
1181 | int rv; | |
1182 | ||
1183 | for_each_possible_cpu(i) { | |
1184 | struct xt_info_lock *lock = &per_cpu(xt_info_locks, i); | |
1185 | spin_lock_init(&lock->lock); | |
1186 | lock->readers = 0; | |
1187 | } | |
2e4e6a17 | 1188 | |
7e9c6eeb | 1189 | xt = kmalloc(sizeof(struct xt_af) * NFPROTO_NUMPROTO, GFP_KERNEL); |
2e4e6a17 HW |
1190 | if (!xt) |
1191 | return -ENOMEM; | |
1192 | ||
7e9c6eeb | 1193 | for (i = 0; i < NFPROTO_NUMPROTO; i++) { |
9e19bb6d | 1194 | mutex_init(&xt[i].mutex); |
2722971c DM |
1195 | #ifdef CONFIG_COMPAT |
1196 | mutex_init(&xt[i].compat_mutex); | |
b386d9f5 | 1197 | xt[i].compat_offsets = NULL; |
2722971c | 1198 | #endif |
2e4e6a17 HW |
1199 | INIT_LIST_HEAD(&xt[i].target); |
1200 | INIT_LIST_HEAD(&xt[i].match); | |
2e4e6a17 | 1201 | } |
8d870052 AD |
1202 | rv = register_pernet_subsys(&xt_net_ops); |
1203 | if (rv < 0) | |
1204 | kfree(xt); | |
1205 | return rv; | |
2e4e6a17 HW |
1206 | } |
1207 | ||
1208 | static void __exit xt_fini(void) | |
1209 | { | |
8d870052 | 1210 | unregister_pernet_subsys(&xt_net_ops); |
2e4e6a17 HW |
1211 | kfree(xt); |
1212 | } | |
1213 | ||
1214 | module_init(xt_init); | |
1215 | module_exit(xt_fini); | |
1216 |