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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> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
457c4cbc | 26 | #include <net/net_namespace.h> |
2e4e6a17 HW |
27 | |
28 | #include <linux/netfilter/x_tables.h> | |
29 | #include <linux/netfilter_arp.h> | |
e3eaa991 JE |
30 | #include <linux/netfilter_ipv4/ip_tables.h> |
31 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
32 | #include <linux/netfilter_arp/arp_tables.h> | |
9e19bb6d | 33 | |
2e4e6a17 HW |
34 | MODULE_LICENSE("GPL"); |
35 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
043ef46c | 36 | MODULE_DESCRIPTION("{ip,ip6,arp,eb}_tables backend module"); |
2e4e6a17 HW |
37 | |
38 | #define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1)) | |
39 | ||
b386d9f5 PM |
40 | struct compat_delta { |
41 | struct compat_delta *next; | |
42 | unsigned int offset; | |
3e5e524f | 43 | int delta; |
b386d9f5 PM |
44 | }; |
45 | ||
2e4e6a17 | 46 | struct xt_af { |
9e19bb6d | 47 | struct mutex mutex; |
2e4e6a17 HW |
48 | struct list_head match; |
49 | struct list_head target; | |
b386d9f5 | 50 | #ifdef CONFIG_COMPAT |
2722971c | 51 | struct mutex compat_mutex; |
b386d9f5 PM |
52 | struct compat_delta *compat_offsets; |
53 | #endif | |
2e4e6a17 HW |
54 | }; |
55 | ||
56 | static struct xt_af *xt; | |
57 | ||
58 | #ifdef DEBUG_IP_FIREWALL_USER | |
59 | #define duprintf(format, args...) printk(format , ## args) | |
60 | #else | |
61 | #define duprintf(format, args...) | |
62 | #endif | |
63 | ||
7e9c6eeb JE |
64 | static const char *const xt_prefix[NFPROTO_NUMPROTO] = { |
65 | [NFPROTO_UNSPEC] = "x", | |
66 | [NFPROTO_IPV4] = "ip", | |
67 | [NFPROTO_ARP] = "arp", | |
68 | [NFPROTO_BRIDGE] = "eb", | |
69 | [NFPROTO_IPV6] = "ip6", | |
37f9f733 PM |
70 | }; |
71 | ||
2e4e6a17 HW |
72 | /* Registration hooks for targets. */ |
73 | int | |
a45049c5 | 74 | xt_register_target(struct xt_target *target) |
2e4e6a17 | 75 | { |
76108cea JE |
76 | u_int8_t af = target->family; |
77 | int ret; | |
2e4e6a17 | 78 | |
9e19bb6d | 79 | ret = mutex_lock_interruptible(&xt[af].mutex); |
2e4e6a17 HW |
80 | if (ret != 0) |
81 | return ret; | |
82 | list_add(&target->list, &xt[af].target); | |
9e19bb6d | 83 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
84 | return ret; |
85 | } | |
86 | EXPORT_SYMBOL(xt_register_target); | |
87 | ||
88 | void | |
a45049c5 | 89 | xt_unregister_target(struct xt_target *target) |
2e4e6a17 | 90 | { |
76108cea | 91 | u_int8_t af = target->family; |
a45049c5 | 92 | |
9e19bb6d | 93 | mutex_lock(&xt[af].mutex); |
df0933dc | 94 | list_del(&target->list); |
9e19bb6d | 95 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
96 | } |
97 | EXPORT_SYMBOL(xt_unregister_target); | |
98 | ||
52d9c42e PM |
99 | int |
100 | xt_register_targets(struct xt_target *target, unsigned int n) | |
101 | { | |
102 | unsigned int i; | |
103 | int err = 0; | |
104 | ||
105 | for (i = 0; i < n; i++) { | |
106 | err = xt_register_target(&target[i]); | |
107 | if (err) | |
108 | goto err; | |
109 | } | |
110 | return err; | |
111 | ||
112 | err: | |
113 | if (i > 0) | |
114 | xt_unregister_targets(target, i); | |
115 | return err; | |
116 | } | |
117 | EXPORT_SYMBOL(xt_register_targets); | |
118 | ||
119 | void | |
120 | xt_unregister_targets(struct xt_target *target, unsigned int n) | |
121 | { | |
122 | unsigned int i; | |
123 | ||
124 | for (i = 0; i < n; i++) | |
125 | xt_unregister_target(&target[i]); | |
126 | } | |
127 | EXPORT_SYMBOL(xt_unregister_targets); | |
128 | ||
2e4e6a17 | 129 | int |
a45049c5 | 130 | xt_register_match(struct xt_match *match) |
2e4e6a17 | 131 | { |
76108cea JE |
132 | u_int8_t af = match->family; |
133 | int ret; | |
2e4e6a17 | 134 | |
9e19bb6d | 135 | ret = mutex_lock_interruptible(&xt[af].mutex); |
2e4e6a17 HW |
136 | if (ret != 0) |
137 | return ret; | |
138 | ||
139 | list_add(&match->list, &xt[af].match); | |
9e19bb6d | 140 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
141 | |
142 | return ret; | |
143 | } | |
144 | EXPORT_SYMBOL(xt_register_match); | |
145 | ||
146 | void | |
a45049c5 | 147 | xt_unregister_match(struct xt_match *match) |
2e4e6a17 | 148 | { |
76108cea | 149 | u_int8_t af = match->family; |
a45049c5 | 150 | |
9e19bb6d | 151 | mutex_lock(&xt[af].mutex); |
df0933dc | 152 | list_del(&match->list); |
9e19bb6d | 153 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
154 | } |
155 | EXPORT_SYMBOL(xt_unregister_match); | |
156 | ||
52d9c42e PM |
157 | int |
158 | xt_register_matches(struct xt_match *match, unsigned int n) | |
159 | { | |
160 | unsigned int i; | |
161 | int err = 0; | |
162 | ||
163 | for (i = 0; i < n; i++) { | |
164 | err = xt_register_match(&match[i]); | |
165 | if (err) | |
166 | goto err; | |
167 | } | |
168 | return err; | |
169 | ||
170 | err: | |
171 | if (i > 0) | |
172 | xt_unregister_matches(match, i); | |
173 | return err; | |
174 | } | |
175 | EXPORT_SYMBOL(xt_register_matches); | |
176 | ||
177 | void | |
178 | xt_unregister_matches(struct xt_match *match, unsigned int n) | |
179 | { | |
180 | unsigned int i; | |
181 | ||
182 | for (i = 0; i < n; i++) | |
183 | xt_unregister_match(&match[i]); | |
184 | } | |
185 | EXPORT_SYMBOL(xt_unregister_matches); | |
186 | ||
2e4e6a17 HW |
187 | |
188 | /* | |
189 | * These are weird, but module loading must not be done with mutex | |
190 | * held (since they will register), and we have to have a single | |
191 | * function to use try_then_request_module(). | |
192 | */ | |
193 | ||
194 | /* Find match, grabs ref. Returns ERR_PTR() on error. */ | |
76108cea | 195 | struct xt_match *xt_find_match(u8 af, const char *name, u8 revision) |
2e4e6a17 HW |
196 | { |
197 | struct xt_match *m; | |
198 | int err = 0; | |
199 | ||
9e19bb6d | 200 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
2e4e6a17 HW |
201 | return ERR_PTR(-EINTR); |
202 | ||
203 | list_for_each_entry(m, &xt[af].match, list) { | |
204 | if (strcmp(m->name, name) == 0) { | |
205 | if (m->revision == revision) { | |
206 | if (try_module_get(m->me)) { | |
9e19bb6d | 207 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
208 | return m; |
209 | } | |
210 | } else | |
211 | err = -EPROTOTYPE; /* Found something. */ | |
212 | } | |
213 | } | |
9e19bb6d | 214 | mutex_unlock(&xt[af].mutex); |
55b69e91 JE |
215 | |
216 | if (af != NFPROTO_UNSPEC) | |
217 | /* Try searching again in the family-independent list */ | |
218 | return xt_find_match(NFPROTO_UNSPEC, name, revision); | |
219 | ||
2e4e6a17 HW |
220 | return ERR_PTR(err); |
221 | } | |
222 | EXPORT_SYMBOL(xt_find_match); | |
223 | ||
224 | /* Find target, grabs ref. Returns ERR_PTR() on error. */ | |
76108cea | 225 | struct xt_target *xt_find_target(u8 af, const char *name, u8 revision) |
2e4e6a17 HW |
226 | { |
227 | struct xt_target *t; | |
228 | int err = 0; | |
229 | ||
9e19bb6d | 230 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
2e4e6a17 HW |
231 | return ERR_PTR(-EINTR); |
232 | ||
233 | list_for_each_entry(t, &xt[af].target, list) { | |
234 | if (strcmp(t->name, name) == 0) { | |
235 | if (t->revision == revision) { | |
236 | if (try_module_get(t->me)) { | |
9e19bb6d | 237 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
238 | return t; |
239 | } | |
240 | } else | |
241 | err = -EPROTOTYPE; /* Found something. */ | |
242 | } | |
243 | } | |
9e19bb6d | 244 | mutex_unlock(&xt[af].mutex); |
55b69e91 JE |
245 | |
246 | if (af != NFPROTO_UNSPEC) | |
247 | /* Try searching again in the family-independent list */ | |
248 | return xt_find_target(NFPROTO_UNSPEC, name, revision); | |
249 | ||
2e4e6a17 HW |
250 | return ERR_PTR(err); |
251 | } | |
252 | EXPORT_SYMBOL(xt_find_target); | |
253 | ||
76108cea | 254 | struct xt_target *xt_request_find_target(u8 af, const char *name, u8 revision) |
2e4e6a17 HW |
255 | { |
256 | struct xt_target *target; | |
257 | ||
258 | target = try_then_request_module(xt_find_target(af, name, revision), | |
37f9f733 | 259 | "%st_%s", xt_prefix[af], name); |
2e4e6a17 HW |
260 | if (IS_ERR(target) || !target) |
261 | return NULL; | |
262 | return target; | |
263 | } | |
264 | EXPORT_SYMBOL_GPL(xt_request_find_target); | |
265 | ||
76108cea | 266 | static int match_revfn(u8 af, const char *name, u8 revision, int *bestp) |
2e4e6a17 | 267 | { |
5452e425 | 268 | const struct xt_match *m; |
2e4e6a17 HW |
269 | int have_rev = 0; |
270 | ||
271 | list_for_each_entry(m, &xt[af].match, list) { | |
272 | if (strcmp(m->name, name) == 0) { | |
273 | if (m->revision > *bestp) | |
274 | *bestp = m->revision; | |
275 | if (m->revision == revision) | |
276 | have_rev = 1; | |
277 | } | |
278 | } | |
656caff2 PM |
279 | |
280 | if (af != NFPROTO_UNSPEC && !have_rev) | |
281 | return match_revfn(NFPROTO_UNSPEC, name, revision, bestp); | |
282 | ||
2e4e6a17 HW |
283 | return have_rev; |
284 | } | |
285 | ||
76108cea | 286 | static int target_revfn(u8 af, const char *name, u8 revision, int *bestp) |
2e4e6a17 | 287 | { |
5452e425 | 288 | const struct xt_target *t; |
2e4e6a17 HW |
289 | int have_rev = 0; |
290 | ||
291 | list_for_each_entry(t, &xt[af].target, list) { | |
292 | if (strcmp(t->name, name) == 0) { | |
293 | if (t->revision > *bestp) | |
294 | *bestp = t->revision; | |
295 | if (t->revision == revision) | |
296 | have_rev = 1; | |
297 | } | |
298 | } | |
656caff2 PM |
299 | |
300 | if (af != NFPROTO_UNSPEC && !have_rev) | |
301 | return target_revfn(NFPROTO_UNSPEC, name, revision, bestp); | |
302 | ||
2e4e6a17 HW |
303 | return have_rev; |
304 | } | |
305 | ||
306 | /* Returns true or false (if no such extension at all) */ | |
76108cea | 307 | int xt_find_revision(u8 af, const char *name, u8 revision, int target, |
2e4e6a17 HW |
308 | int *err) |
309 | { | |
310 | int have_rev, best = -1; | |
311 | ||
9e19bb6d | 312 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) { |
2e4e6a17 HW |
313 | *err = -EINTR; |
314 | return 1; | |
315 | } | |
316 | if (target == 1) | |
317 | have_rev = target_revfn(af, name, revision, &best); | |
318 | else | |
319 | have_rev = match_revfn(af, name, revision, &best); | |
9e19bb6d | 320 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
321 | |
322 | /* Nothing at all? Return 0 to try loading module. */ | |
323 | if (best == -1) { | |
324 | *err = -ENOENT; | |
325 | return 0; | |
326 | } | |
327 | ||
328 | *err = best; | |
329 | if (!have_rev) | |
330 | *err = -EPROTONOSUPPORT; | |
331 | return 1; | |
332 | } | |
333 | EXPORT_SYMBOL_GPL(xt_find_revision); | |
334 | ||
45185364 JE |
335 | static char *textify_hooks(char *buf, size_t size, unsigned int mask) |
336 | { | |
337 | static const char *const names[] = { | |
338 | "PREROUTING", "INPUT", "FORWARD", | |
339 | "OUTPUT", "POSTROUTING", "BROUTING", | |
340 | }; | |
341 | unsigned int i; | |
342 | char *p = buf; | |
343 | bool np = false; | |
344 | int res; | |
345 | ||
346 | *p = '\0'; | |
347 | for (i = 0; i < ARRAY_SIZE(names); ++i) { | |
348 | if (!(mask & (1 << i))) | |
349 | continue; | |
350 | res = snprintf(p, size, "%s%s", np ? "/" : "", names[i]); | |
351 | if (res > 0) { | |
352 | size -= res; | |
353 | p += res; | |
354 | } | |
355 | np = true; | |
356 | } | |
357 | ||
358 | return buf; | |
359 | } | |
360 | ||
916a917d | 361 | int xt_check_match(struct xt_mtchk_param *par, |
9b4fce7a | 362 | unsigned int size, u_int8_t proto, bool inv_proto) |
37f9f733 | 363 | { |
9b4fce7a JE |
364 | if (XT_ALIGN(par->match->matchsize) != size && |
365 | par->match->matchsize != -1) { | |
043ef46c JE |
366 | /* |
367 | * ebt_among is exempt from centralized matchsize checking | |
368 | * because it uses a dynamic-size data set. | |
369 | */ | |
b402405d JE |
370 | pr_err("%s_tables: %s.%u match: invalid size " |
371 | "%u (kernel) != (user) %u\n", | |
916a917d | 372 | xt_prefix[par->family], par->match->name, |
b402405d | 373 | par->match->revision, |
9b4fce7a | 374 | XT_ALIGN(par->match->matchsize), size); |
37f9f733 PM |
375 | return -EINVAL; |
376 | } | |
9b4fce7a JE |
377 | if (par->match->table != NULL && |
378 | strcmp(par->match->table, par->table) != 0) { | |
3dd5d7e3 | 379 | pr_err("%s_tables: %s match: only valid in %s table, not %s\n", |
916a917d | 380 | xt_prefix[par->family], par->match->name, |
9b4fce7a | 381 | par->match->table, par->table); |
37f9f733 PM |
382 | return -EINVAL; |
383 | } | |
9b4fce7a | 384 | if (par->match->hooks && (par->hook_mask & ~par->match->hooks) != 0) { |
45185364 JE |
385 | char used[64], allow[64]; |
386 | ||
3dd5d7e3 | 387 | pr_err("%s_tables: %s match: used from hooks %s, but only " |
45185364 | 388 | "valid from %s\n", |
916a917d | 389 | xt_prefix[par->family], par->match->name, |
45185364 JE |
390 | textify_hooks(used, sizeof(used), par->hook_mask), |
391 | textify_hooks(allow, sizeof(allow), par->match->hooks)); | |
37f9f733 PM |
392 | return -EINVAL; |
393 | } | |
9b4fce7a | 394 | if (par->match->proto && (par->match->proto != proto || inv_proto)) { |
3dd5d7e3 | 395 | pr_err("%s_tables: %s match: only valid for protocol %u\n", |
916a917d JE |
396 | xt_prefix[par->family], par->match->name, |
397 | par->match->proto); | |
37f9f733 PM |
398 | return -EINVAL; |
399 | } | |
9b4fce7a | 400 | if (par->match->checkentry != NULL && !par->match->checkentry(par)) |
367c6790 | 401 | return -EINVAL; |
37f9f733 PM |
402 | return 0; |
403 | } | |
404 | EXPORT_SYMBOL_GPL(xt_check_match); | |
405 | ||
2722971c | 406 | #ifdef CONFIG_COMPAT |
76108cea | 407 | int xt_compat_add_offset(u_int8_t af, unsigned int offset, short delta) |
b386d9f5 PM |
408 | { |
409 | struct compat_delta *tmp; | |
410 | ||
411 | tmp = kmalloc(sizeof(struct compat_delta), GFP_KERNEL); | |
412 | if (!tmp) | |
413 | return -ENOMEM; | |
414 | ||
415 | tmp->offset = offset; | |
416 | tmp->delta = delta; | |
417 | ||
418 | if (xt[af].compat_offsets) { | |
419 | tmp->next = xt[af].compat_offsets->next; | |
420 | xt[af].compat_offsets->next = tmp; | |
421 | } else { | |
422 | xt[af].compat_offsets = tmp; | |
423 | tmp->next = NULL; | |
424 | } | |
425 | return 0; | |
426 | } | |
427 | EXPORT_SYMBOL_GPL(xt_compat_add_offset); | |
428 | ||
76108cea | 429 | void xt_compat_flush_offsets(u_int8_t af) |
b386d9f5 PM |
430 | { |
431 | struct compat_delta *tmp, *next; | |
432 | ||
433 | if (xt[af].compat_offsets) { | |
434 | for (tmp = xt[af].compat_offsets; tmp; tmp = next) { | |
435 | next = tmp->next; | |
436 | kfree(tmp); | |
437 | } | |
438 | xt[af].compat_offsets = NULL; | |
439 | } | |
440 | } | |
441 | EXPORT_SYMBOL_GPL(xt_compat_flush_offsets); | |
442 | ||
3e5e524f | 443 | int xt_compat_calc_jump(u_int8_t af, unsigned int offset) |
b386d9f5 PM |
444 | { |
445 | struct compat_delta *tmp; | |
3e5e524f | 446 | int delta; |
b386d9f5 PM |
447 | |
448 | for (tmp = xt[af].compat_offsets, delta = 0; tmp; tmp = tmp->next) | |
449 | if (tmp->offset < offset) | |
450 | delta += tmp->delta; | |
451 | return delta; | |
452 | } | |
453 | EXPORT_SYMBOL_GPL(xt_compat_calc_jump); | |
454 | ||
5452e425 | 455 | int xt_compat_match_offset(const struct xt_match *match) |
2722971c | 456 | { |
9fa492cd PM |
457 | u_int16_t csize = match->compatsize ? : match->matchsize; |
458 | return XT_ALIGN(match->matchsize) - COMPAT_XT_ALIGN(csize); | |
459 | } | |
460 | EXPORT_SYMBOL_GPL(xt_compat_match_offset); | |
461 | ||
89566951 | 462 | int xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr, |
b0a6363c | 463 | unsigned int *size) |
9fa492cd | 464 | { |
5452e425 | 465 | const struct xt_match *match = m->u.kernel.match; |
9fa492cd PM |
466 | struct compat_xt_entry_match *cm = (struct compat_xt_entry_match *)m; |
467 | int pad, off = xt_compat_match_offset(match); | |
468 | u_int16_t msize = cm->u.user.match_size; | |
469 | ||
470 | m = *dstptr; | |
471 | memcpy(m, cm, sizeof(*cm)); | |
472 | if (match->compat_from_user) | |
473 | match->compat_from_user(m->data, cm->data); | |
474 | else | |
475 | memcpy(m->data, cm->data, msize - sizeof(*cm)); | |
476 | pad = XT_ALIGN(match->matchsize) - match->matchsize; | |
477 | if (pad > 0) | |
478 | memset(m->data + match->matchsize, 0, pad); | |
479 | ||
480 | msize += off; | |
481 | m->u.user.match_size = msize; | |
482 | ||
483 | *size += off; | |
484 | *dstptr += msize; | |
89566951 | 485 | return 0; |
9fa492cd PM |
486 | } |
487 | EXPORT_SYMBOL_GPL(xt_compat_match_from_user); | |
488 | ||
739674fb JE |
489 | int xt_compat_match_to_user(const struct xt_entry_match *m, |
490 | void __user **dstptr, unsigned int *size) | |
9fa492cd | 491 | { |
5452e425 | 492 | const struct xt_match *match = m->u.kernel.match; |
9fa492cd PM |
493 | struct compat_xt_entry_match __user *cm = *dstptr; |
494 | int off = xt_compat_match_offset(match); | |
495 | u_int16_t msize = m->u.user.match_size - off; | |
496 | ||
497 | if (copy_to_user(cm, m, sizeof(*cm)) || | |
a18aa31b PM |
498 | put_user(msize, &cm->u.user.match_size) || |
499 | copy_to_user(cm->u.user.name, m->u.kernel.match->name, | |
500 | strlen(m->u.kernel.match->name) + 1)) | |
601e68e1 | 501 | return -EFAULT; |
9fa492cd PM |
502 | |
503 | if (match->compat_to_user) { | |
504 | if (match->compat_to_user((void __user *)cm->data, m->data)) | |
505 | return -EFAULT; | |
506 | } else { | |
507 | if (copy_to_user(cm->data, m->data, msize - sizeof(*cm))) | |
508 | return -EFAULT; | |
2722971c | 509 | } |
9fa492cd PM |
510 | |
511 | *size -= off; | |
512 | *dstptr += msize; | |
513 | return 0; | |
2722971c | 514 | } |
9fa492cd PM |
515 | EXPORT_SYMBOL_GPL(xt_compat_match_to_user); |
516 | #endif /* CONFIG_COMPAT */ | |
2722971c | 517 | |
916a917d | 518 | int xt_check_target(struct xt_tgchk_param *par, |
af5d6dc2 | 519 | unsigned int size, u_int8_t proto, bool inv_proto) |
37f9f733 | 520 | { |
af5d6dc2 | 521 | if (XT_ALIGN(par->target->targetsize) != size) { |
b402405d JE |
522 | pr_err("%s_tables: %s.%u target: invalid size " |
523 | "%u (kernel) != (user) %u\n", | |
916a917d | 524 | xt_prefix[par->family], par->target->name, |
b402405d | 525 | par->target->revision, |
af5d6dc2 | 526 | XT_ALIGN(par->target->targetsize), size); |
37f9f733 PM |
527 | return -EINVAL; |
528 | } | |
af5d6dc2 JE |
529 | if (par->target->table != NULL && |
530 | strcmp(par->target->table, par->table) != 0) { | |
3dd5d7e3 | 531 | pr_err("%s_tables: %s target: only valid in %s table, not %s\n", |
916a917d | 532 | xt_prefix[par->family], par->target->name, |
af5d6dc2 | 533 | par->target->table, par->table); |
37f9f733 PM |
534 | return -EINVAL; |
535 | } | |
af5d6dc2 | 536 | if (par->target->hooks && (par->hook_mask & ~par->target->hooks) != 0) { |
45185364 JE |
537 | char used[64], allow[64]; |
538 | ||
3dd5d7e3 | 539 | pr_err("%s_tables: %s target: used from hooks %s, but only " |
45185364 | 540 | "usable from %s\n", |
916a917d | 541 | xt_prefix[par->family], par->target->name, |
45185364 JE |
542 | textify_hooks(used, sizeof(used), par->hook_mask), |
543 | textify_hooks(allow, sizeof(allow), par->target->hooks)); | |
37f9f733 PM |
544 | return -EINVAL; |
545 | } | |
af5d6dc2 | 546 | if (par->target->proto && (par->target->proto != proto || inv_proto)) { |
3dd5d7e3 | 547 | pr_err("%s_tables: %s target: only valid for protocol %u\n", |
916a917d | 548 | xt_prefix[par->family], par->target->name, |
af5d6dc2 | 549 | par->target->proto); |
37f9f733 PM |
550 | return -EINVAL; |
551 | } | |
af5d6dc2 | 552 | if (par->target->checkentry != NULL && !par->target->checkentry(par)) |
367c6790 | 553 | return -EINVAL; |
37f9f733 PM |
554 | return 0; |
555 | } | |
556 | EXPORT_SYMBOL_GPL(xt_check_target); | |
557 | ||
2722971c | 558 | #ifdef CONFIG_COMPAT |
5452e425 | 559 | int xt_compat_target_offset(const struct xt_target *target) |
2722971c | 560 | { |
9fa492cd PM |
561 | u_int16_t csize = target->compatsize ? : target->targetsize; |
562 | return XT_ALIGN(target->targetsize) - COMPAT_XT_ALIGN(csize); | |
563 | } | |
564 | EXPORT_SYMBOL_GPL(xt_compat_target_offset); | |
565 | ||
566 | void xt_compat_target_from_user(struct xt_entry_target *t, void **dstptr, | |
b0a6363c | 567 | unsigned int *size) |
9fa492cd | 568 | { |
5452e425 | 569 | const struct xt_target *target = t->u.kernel.target; |
9fa492cd PM |
570 | struct compat_xt_entry_target *ct = (struct compat_xt_entry_target *)t; |
571 | int pad, off = xt_compat_target_offset(target); | |
572 | u_int16_t tsize = ct->u.user.target_size; | |
573 | ||
574 | t = *dstptr; | |
575 | memcpy(t, ct, sizeof(*ct)); | |
576 | if (target->compat_from_user) | |
577 | target->compat_from_user(t->data, ct->data); | |
578 | else | |
579 | memcpy(t->data, ct->data, tsize - sizeof(*ct)); | |
580 | pad = XT_ALIGN(target->targetsize) - target->targetsize; | |
581 | if (pad > 0) | |
582 | memset(t->data + target->targetsize, 0, pad); | |
583 | ||
584 | tsize += off; | |
585 | t->u.user.target_size = tsize; | |
586 | ||
587 | *size += off; | |
588 | *dstptr += tsize; | |
589 | } | |
590 | EXPORT_SYMBOL_GPL(xt_compat_target_from_user); | |
591 | ||
739674fb JE |
592 | int xt_compat_target_to_user(const struct xt_entry_target *t, |
593 | void __user **dstptr, unsigned int *size) | |
9fa492cd | 594 | { |
5452e425 | 595 | const struct xt_target *target = t->u.kernel.target; |
9fa492cd PM |
596 | struct compat_xt_entry_target __user *ct = *dstptr; |
597 | int off = xt_compat_target_offset(target); | |
598 | u_int16_t tsize = t->u.user.target_size - off; | |
599 | ||
600 | if (copy_to_user(ct, t, sizeof(*ct)) || | |
a18aa31b PM |
601 | put_user(tsize, &ct->u.user.target_size) || |
602 | copy_to_user(ct->u.user.name, t->u.kernel.target->name, | |
603 | strlen(t->u.kernel.target->name) + 1)) | |
601e68e1 | 604 | return -EFAULT; |
9fa492cd PM |
605 | |
606 | if (target->compat_to_user) { | |
607 | if (target->compat_to_user((void __user *)ct->data, t->data)) | |
608 | return -EFAULT; | |
609 | } else { | |
610 | if (copy_to_user(ct->data, t->data, tsize - sizeof(*ct))) | |
611 | return -EFAULT; | |
2722971c | 612 | } |
9fa492cd PM |
613 | |
614 | *size -= off; | |
615 | *dstptr += tsize; | |
616 | return 0; | |
2722971c | 617 | } |
9fa492cd | 618 | EXPORT_SYMBOL_GPL(xt_compat_target_to_user); |
2722971c DM |
619 | #endif |
620 | ||
2e4e6a17 HW |
621 | struct xt_table_info *xt_alloc_table_info(unsigned int size) |
622 | { | |
623 | struct xt_table_info *newinfo; | |
624 | int cpu; | |
625 | ||
626 | /* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */ | |
4481374c | 627 | if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > totalram_pages) |
2e4e6a17 HW |
628 | return NULL; |
629 | ||
259d4e41 | 630 | newinfo = kzalloc(XT_TABLE_INFO_SZ, GFP_KERNEL); |
2e4e6a17 HW |
631 | if (!newinfo) |
632 | return NULL; | |
633 | ||
634 | newinfo->size = size; | |
635 | ||
6f912042 | 636 | for_each_possible_cpu(cpu) { |
2e4e6a17 HW |
637 | if (size <= PAGE_SIZE) |
638 | newinfo->entries[cpu] = kmalloc_node(size, | |
639 | GFP_KERNEL, | |
640 | cpu_to_node(cpu)); | |
641 | else | |
642 | newinfo->entries[cpu] = vmalloc_node(size, | |
643 | cpu_to_node(cpu)); | |
644 | ||
645 | if (newinfo->entries[cpu] == NULL) { | |
646 | xt_free_table_info(newinfo); | |
647 | return NULL; | |
648 | } | |
649 | } | |
650 | ||
651 | return newinfo; | |
652 | } | |
653 | EXPORT_SYMBOL(xt_alloc_table_info); | |
654 | ||
655 | void xt_free_table_info(struct xt_table_info *info) | |
656 | { | |
657 | int cpu; | |
658 | ||
6f912042 | 659 | for_each_possible_cpu(cpu) { |
2e4e6a17 HW |
660 | if (info->size <= PAGE_SIZE) |
661 | kfree(info->entries[cpu]); | |
662 | else | |
663 | vfree(info->entries[cpu]); | |
664 | } | |
665 | kfree(info); | |
666 | } | |
667 | EXPORT_SYMBOL(xt_free_table_info); | |
668 | ||
669 | /* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */ | |
76108cea JE |
670 | struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af, |
671 | const char *name) | |
2e4e6a17 HW |
672 | { |
673 | struct xt_table *t; | |
674 | ||
9e19bb6d | 675 | if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
2e4e6a17 HW |
676 | return ERR_PTR(-EINTR); |
677 | ||
8d870052 | 678 | list_for_each_entry(t, &net->xt.tables[af], list) |
2e4e6a17 HW |
679 | if (strcmp(t->name, name) == 0 && try_module_get(t->me)) |
680 | return t; | |
9e19bb6d | 681 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
682 | return NULL; |
683 | } | |
684 | EXPORT_SYMBOL_GPL(xt_find_table_lock); | |
685 | ||
686 | void xt_table_unlock(struct xt_table *table) | |
687 | { | |
9e19bb6d | 688 | mutex_unlock(&xt[table->af].mutex); |
2e4e6a17 HW |
689 | } |
690 | EXPORT_SYMBOL_GPL(xt_table_unlock); | |
691 | ||
2722971c | 692 | #ifdef CONFIG_COMPAT |
76108cea | 693 | void xt_compat_lock(u_int8_t af) |
2722971c DM |
694 | { |
695 | mutex_lock(&xt[af].compat_mutex); | |
696 | } | |
697 | EXPORT_SYMBOL_GPL(xt_compat_lock); | |
698 | ||
76108cea | 699 | void xt_compat_unlock(u_int8_t af) |
2722971c DM |
700 | { |
701 | mutex_unlock(&xt[af].compat_mutex); | |
702 | } | |
703 | EXPORT_SYMBOL_GPL(xt_compat_unlock); | |
704 | #endif | |
2e4e6a17 | 705 | |
942e4a2b SH |
706 | DEFINE_PER_CPU(struct xt_info_lock, xt_info_locks); |
707 | EXPORT_PER_CPU_SYMBOL_GPL(xt_info_locks); | |
708 | ||
709 | ||
2e4e6a17 HW |
710 | struct xt_table_info * |
711 | xt_replace_table(struct xt_table *table, | |
712 | unsigned int num_counters, | |
713 | struct xt_table_info *newinfo, | |
714 | int *error) | |
715 | { | |
942e4a2b | 716 | struct xt_table_info *private; |
2e4e6a17 HW |
717 | |
718 | /* Do the substitution. */ | |
942e4a2b | 719 | local_bh_disable(); |
2e4e6a17 | 720 | private = table->private; |
942e4a2b | 721 | |
2e4e6a17 HW |
722 | /* Check inside lock: is the old number correct? */ |
723 | if (num_counters != private->number) { | |
724 | duprintf("num_counters != table->private->number (%u/%u)\n", | |
725 | num_counters, private->number); | |
942e4a2b | 726 | local_bh_enable(); |
2e4e6a17 HW |
727 | *error = -EAGAIN; |
728 | return NULL; | |
729 | } | |
2e4e6a17 | 730 | |
942e4a2b SH |
731 | table->private = newinfo; |
732 | newinfo->initial_entries = private->initial_entries; | |
733 | ||
734 | /* | |
735 | * Even though table entries have now been swapped, other CPU's | |
736 | * may still be using the old entries. This is okay, because | |
737 | * resynchronization happens because of the locking done | |
738 | * during the get_counters() routine. | |
739 | */ | |
740 | local_bh_enable(); | |
741 | ||
742 | return private; | |
2e4e6a17 HW |
743 | } |
744 | EXPORT_SYMBOL_GPL(xt_replace_table); | |
745 | ||
35aad0ff JE |
746 | struct xt_table *xt_register_table(struct net *net, |
747 | const struct xt_table *input_table, | |
a98da11d AD |
748 | struct xt_table_info *bootstrap, |
749 | struct xt_table_info *newinfo) | |
2e4e6a17 HW |
750 | { |
751 | int ret; | |
752 | struct xt_table_info *private; | |
35aad0ff | 753 | struct xt_table *t, *table; |
2e4e6a17 | 754 | |
44d34e72 | 755 | /* Don't add one object to multiple lists. */ |
35aad0ff | 756 | table = kmemdup(input_table, sizeof(struct xt_table), GFP_KERNEL); |
44d34e72 AD |
757 | if (!table) { |
758 | ret = -ENOMEM; | |
759 | goto out; | |
760 | } | |
761 | ||
9e19bb6d | 762 | ret = mutex_lock_interruptible(&xt[table->af].mutex); |
2e4e6a17 | 763 | if (ret != 0) |
44d34e72 | 764 | goto out_free; |
2e4e6a17 HW |
765 | |
766 | /* Don't autoload: we'd eat our tail... */ | |
8d870052 | 767 | list_for_each_entry(t, &net->xt.tables[table->af], list) { |
df0933dc PM |
768 | if (strcmp(t->name, table->name) == 0) { |
769 | ret = -EEXIST; | |
770 | goto unlock; | |
771 | } | |
2e4e6a17 HW |
772 | } |
773 | ||
774 | /* Simplifies replace_table code. */ | |
775 | table->private = bootstrap; | |
78454473 | 776 | |
2e4e6a17 HW |
777 | if (!xt_replace_table(table, 0, newinfo, &ret)) |
778 | goto unlock; | |
779 | ||
780 | private = table->private; | |
781 | duprintf("table->private->number = %u\n", private->number); | |
782 | ||
783 | /* save number of initial entries */ | |
784 | private->initial_entries = private->number; | |
785 | ||
8d870052 | 786 | list_add(&table->list, &net->xt.tables[table->af]); |
a98da11d AD |
787 | mutex_unlock(&xt[table->af].mutex); |
788 | return table; | |
2e4e6a17 | 789 | |
2e4e6a17 | 790 | unlock: |
9e19bb6d | 791 | mutex_unlock(&xt[table->af].mutex); |
44d34e72 AD |
792 | out_free: |
793 | kfree(table); | |
a98da11d AD |
794 | out: |
795 | return ERR_PTR(ret); | |
2e4e6a17 HW |
796 | } |
797 | EXPORT_SYMBOL_GPL(xt_register_table); | |
798 | ||
799 | void *xt_unregister_table(struct xt_table *table) | |
800 | { | |
801 | struct xt_table_info *private; | |
802 | ||
9e19bb6d | 803 | mutex_lock(&xt[table->af].mutex); |
2e4e6a17 | 804 | private = table->private; |
df0933dc | 805 | list_del(&table->list); |
9e19bb6d | 806 | mutex_unlock(&xt[table->af].mutex); |
44d34e72 | 807 | kfree(table); |
2e4e6a17 HW |
808 | |
809 | return private; | |
810 | } | |
811 | EXPORT_SYMBOL_GPL(xt_unregister_table); | |
812 | ||
813 | #ifdef CONFIG_PROC_FS | |
715cf35a AD |
814 | struct xt_names_priv { |
815 | struct seq_net_private p; | |
76108cea | 816 | u_int8_t af; |
715cf35a | 817 | }; |
025d93d1 | 818 | static void *xt_table_seq_start(struct seq_file *seq, loff_t *pos) |
2e4e6a17 | 819 | { |
715cf35a | 820 | struct xt_names_priv *priv = seq->private; |
1218854a | 821 | struct net *net = seq_file_net(seq); |
76108cea | 822 | u_int8_t af = priv->af; |
2e4e6a17 | 823 | |
025d93d1 | 824 | mutex_lock(&xt[af].mutex); |
715cf35a | 825 | return seq_list_start(&net->xt.tables[af], *pos); |
025d93d1 | 826 | } |
2e4e6a17 | 827 | |
025d93d1 AD |
828 | static void *xt_table_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
829 | { | |
715cf35a | 830 | struct xt_names_priv *priv = seq->private; |
1218854a | 831 | struct net *net = seq_file_net(seq); |
76108cea | 832 | u_int8_t af = priv->af; |
2e4e6a17 | 833 | |
715cf35a | 834 | return seq_list_next(v, &net->xt.tables[af], pos); |
2e4e6a17 HW |
835 | } |
836 | ||
025d93d1 | 837 | static void xt_table_seq_stop(struct seq_file *seq, void *v) |
2e4e6a17 | 838 | { |
715cf35a | 839 | struct xt_names_priv *priv = seq->private; |
76108cea | 840 | u_int8_t af = priv->af; |
2e4e6a17 | 841 | |
025d93d1 AD |
842 | mutex_unlock(&xt[af].mutex); |
843 | } | |
2e4e6a17 | 844 | |
025d93d1 AD |
845 | static int xt_table_seq_show(struct seq_file *seq, void *v) |
846 | { | |
847 | struct xt_table *table = list_entry(v, struct xt_table, list); | |
2e4e6a17 | 848 | |
025d93d1 AD |
849 | if (strlen(table->name)) |
850 | return seq_printf(seq, "%s\n", table->name); | |
851 | else | |
852 | return 0; | |
853 | } | |
601e68e1 | 854 | |
025d93d1 AD |
855 | static const struct seq_operations xt_table_seq_ops = { |
856 | .start = xt_table_seq_start, | |
857 | .next = xt_table_seq_next, | |
858 | .stop = xt_table_seq_stop, | |
859 | .show = xt_table_seq_show, | |
860 | }; | |
861 | ||
862 | static int xt_table_open(struct inode *inode, struct file *file) | |
863 | { | |
864 | int ret; | |
715cf35a | 865 | struct xt_names_priv *priv; |
025d93d1 | 866 | |
715cf35a AD |
867 | ret = seq_open_net(inode, file, &xt_table_seq_ops, |
868 | sizeof(struct xt_names_priv)); | |
025d93d1 | 869 | if (!ret) { |
715cf35a AD |
870 | priv = ((struct seq_file *)file->private_data)->private; |
871 | priv->af = (unsigned long)PDE(inode)->data; | |
025d93d1 AD |
872 | } |
873 | return ret; | |
2e4e6a17 HW |
874 | } |
875 | ||
025d93d1 AD |
876 | static const struct file_operations xt_table_ops = { |
877 | .owner = THIS_MODULE, | |
878 | .open = xt_table_open, | |
879 | .read = seq_read, | |
880 | .llseek = seq_lseek, | |
0e93bb94 | 881 | .release = seq_release_net, |
025d93d1 AD |
882 | }; |
883 | ||
eb132205 JE |
884 | /* |
885 | * Traverse state for ip{,6}_{tables,matches} for helping crossing | |
886 | * the multi-AF mutexes. | |
887 | */ | |
888 | struct nf_mttg_trav { | |
889 | struct list_head *head, *curr; | |
890 | uint8_t class, nfproto; | |
891 | }; | |
892 | ||
893 | enum { | |
894 | MTTG_TRAV_INIT, | |
895 | MTTG_TRAV_NFP_UNSPEC, | |
896 | MTTG_TRAV_NFP_SPEC, | |
897 | MTTG_TRAV_DONE, | |
898 | }; | |
899 | ||
900 | static void *xt_mttg_seq_next(struct seq_file *seq, void *v, loff_t *ppos, | |
901 | bool is_target) | |
2e4e6a17 | 902 | { |
eb132205 JE |
903 | static const uint8_t next_class[] = { |
904 | [MTTG_TRAV_NFP_UNSPEC] = MTTG_TRAV_NFP_SPEC, | |
905 | [MTTG_TRAV_NFP_SPEC] = MTTG_TRAV_DONE, | |
906 | }; | |
907 | struct nf_mttg_trav *trav = seq->private; | |
908 | ||
909 | switch (trav->class) { | |
910 | case MTTG_TRAV_INIT: | |
911 | trav->class = MTTG_TRAV_NFP_UNSPEC; | |
912 | mutex_lock(&xt[NFPROTO_UNSPEC].mutex); | |
913 | trav->head = trav->curr = is_target ? | |
914 | &xt[NFPROTO_UNSPEC].target : &xt[NFPROTO_UNSPEC].match; | |
915 | break; | |
916 | case MTTG_TRAV_NFP_UNSPEC: | |
917 | trav->curr = trav->curr->next; | |
918 | if (trav->curr != trav->head) | |
919 | break; | |
920 | mutex_unlock(&xt[NFPROTO_UNSPEC].mutex); | |
921 | mutex_lock(&xt[trav->nfproto].mutex); | |
922 | trav->head = trav->curr = is_target ? | |
923 | &xt[trav->nfproto].target : &xt[trav->nfproto].match; | |
924 | trav->class = next_class[trav->class]; | |
925 | break; | |
926 | case MTTG_TRAV_NFP_SPEC: | |
927 | trav->curr = trav->curr->next; | |
928 | if (trav->curr != trav->head) | |
929 | break; | |
930 | /* fallthru, _stop will unlock */ | |
931 | default: | |
932 | return NULL; | |
933 | } | |
2e4e6a17 | 934 | |
eb132205 JE |
935 | if (ppos != NULL) |
936 | ++*ppos; | |
937 | return trav; | |
025d93d1 | 938 | } |
601e68e1 | 939 | |
eb132205 JE |
940 | static void *xt_mttg_seq_start(struct seq_file *seq, loff_t *pos, |
941 | bool is_target) | |
025d93d1 | 942 | { |
eb132205 JE |
943 | struct nf_mttg_trav *trav = seq->private; |
944 | unsigned int j; | |
2e4e6a17 | 945 | |
eb132205 JE |
946 | trav->class = MTTG_TRAV_INIT; |
947 | for (j = 0; j < *pos; ++j) | |
948 | if (xt_mttg_seq_next(seq, NULL, NULL, is_target) == NULL) | |
949 | return NULL; | |
950 | return trav; | |
2e4e6a17 HW |
951 | } |
952 | ||
eb132205 | 953 | static void xt_mttg_seq_stop(struct seq_file *seq, void *v) |
2e4e6a17 | 954 | { |
eb132205 JE |
955 | struct nf_mttg_trav *trav = seq->private; |
956 | ||
957 | switch (trav->class) { | |
958 | case MTTG_TRAV_NFP_UNSPEC: | |
959 | mutex_unlock(&xt[NFPROTO_UNSPEC].mutex); | |
960 | break; | |
961 | case MTTG_TRAV_NFP_SPEC: | |
962 | mutex_unlock(&xt[trav->nfproto].mutex); | |
963 | break; | |
964 | } | |
965 | } | |
2e4e6a17 | 966 | |
eb132205 JE |
967 | static void *xt_match_seq_start(struct seq_file *seq, loff_t *pos) |
968 | { | |
969 | return xt_mttg_seq_start(seq, pos, false); | |
2e4e6a17 HW |
970 | } |
971 | ||
eb132205 | 972 | static void *xt_match_seq_next(struct seq_file *seq, void *v, loff_t *ppos) |
2e4e6a17 | 973 | { |
eb132205 JE |
974 | return xt_mttg_seq_next(seq, v, ppos, false); |
975 | } | |
2e4e6a17 | 976 | |
eb132205 JE |
977 | static int xt_match_seq_show(struct seq_file *seq, void *v) |
978 | { | |
979 | const struct nf_mttg_trav *trav = seq->private; | |
980 | const struct xt_match *match; | |
981 | ||
982 | switch (trav->class) { | |
983 | case MTTG_TRAV_NFP_UNSPEC: | |
984 | case MTTG_TRAV_NFP_SPEC: | |
985 | if (trav->curr == trav->head) | |
986 | return 0; | |
987 | match = list_entry(trav->curr, struct xt_match, list); | |
988 | return (*match->name == '\0') ? 0 : | |
989 | seq_printf(seq, "%s\n", match->name); | |
990 | } | |
991 | return 0; | |
2e4e6a17 HW |
992 | } |
993 | ||
025d93d1 AD |
994 | static const struct seq_operations xt_match_seq_ops = { |
995 | .start = xt_match_seq_start, | |
996 | .next = xt_match_seq_next, | |
eb132205 | 997 | .stop = xt_mttg_seq_stop, |
025d93d1 | 998 | .show = xt_match_seq_show, |
2e4e6a17 HW |
999 | }; |
1000 | ||
025d93d1 | 1001 | static int xt_match_open(struct inode *inode, struct file *file) |
2e4e6a17 | 1002 | { |
eb132205 JE |
1003 | struct seq_file *seq; |
1004 | struct nf_mttg_trav *trav; | |
2e4e6a17 HW |
1005 | int ret; |
1006 | ||
eb132205 JE |
1007 | trav = kmalloc(sizeof(*trav), GFP_KERNEL); |
1008 | if (trav == NULL) | |
1009 | return -ENOMEM; | |
2e4e6a17 | 1010 | |
eb132205 JE |
1011 | ret = seq_open(file, &xt_match_seq_ops); |
1012 | if (ret < 0) { | |
1013 | kfree(trav); | |
1014 | return ret; | |
2e4e6a17 | 1015 | } |
eb132205 JE |
1016 | |
1017 | seq = file->private_data; | |
1018 | seq->private = trav; | |
1019 | trav->nfproto = (unsigned long)PDE(inode)->data; | |
1020 | return 0; | |
025d93d1 AD |
1021 | } |
1022 | ||
1023 | static const struct file_operations xt_match_ops = { | |
1024 | .owner = THIS_MODULE, | |
1025 | .open = xt_match_open, | |
1026 | .read = seq_read, | |
1027 | .llseek = seq_lseek, | |
eb132205 | 1028 | .release = seq_release_private, |
025d93d1 | 1029 | }; |
2e4e6a17 | 1030 | |
025d93d1 AD |
1031 | static void *xt_target_seq_start(struct seq_file *seq, loff_t *pos) |
1032 | { | |
eb132205 | 1033 | return xt_mttg_seq_start(seq, pos, true); |
025d93d1 AD |
1034 | } |
1035 | ||
eb132205 | 1036 | static void *xt_target_seq_next(struct seq_file *seq, void *v, loff_t *ppos) |
025d93d1 | 1037 | { |
eb132205 | 1038 | return xt_mttg_seq_next(seq, v, ppos, true); |
025d93d1 AD |
1039 | } |
1040 | ||
1041 | static int xt_target_seq_show(struct seq_file *seq, void *v) | |
1042 | { | |
eb132205 JE |
1043 | const struct nf_mttg_trav *trav = seq->private; |
1044 | const struct xt_target *target; | |
1045 | ||
1046 | switch (trav->class) { | |
1047 | case MTTG_TRAV_NFP_UNSPEC: | |
1048 | case MTTG_TRAV_NFP_SPEC: | |
1049 | if (trav->curr == trav->head) | |
1050 | return 0; | |
1051 | target = list_entry(trav->curr, struct xt_target, list); | |
1052 | return (*target->name == '\0') ? 0 : | |
1053 | seq_printf(seq, "%s\n", target->name); | |
1054 | } | |
1055 | return 0; | |
025d93d1 AD |
1056 | } |
1057 | ||
1058 | static const struct seq_operations xt_target_seq_ops = { | |
1059 | .start = xt_target_seq_start, | |
1060 | .next = xt_target_seq_next, | |
eb132205 | 1061 | .stop = xt_mttg_seq_stop, |
025d93d1 AD |
1062 | .show = xt_target_seq_show, |
1063 | }; | |
1064 | ||
1065 | static int xt_target_open(struct inode *inode, struct file *file) | |
1066 | { | |
eb132205 JE |
1067 | struct seq_file *seq; |
1068 | struct nf_mttg_trav *trav; | |
025d93d1 AD |
1069 | int ret; |
1070 | ||
eb132205 JE |
1071 | trav = kmalloc(sizeof(*trav), GFP_KERNEL); |
1072 | if (trav == NULL) | |
1073 | return -ENOMEM; | |
025d93d1 | 1074 | |
eb132205 JE |
1075 | ret = seq_open(file, &xt_target_seq_ops); |
1076 | if (ret < 0) { | |
1077 | kfree(trav); | |
1078 | return ret; | |
025d93d1 | 1079 | } |
eb132205 JE |
1080 | |
1081 | seq = file->private_data; | |
1082 | seq->private = trav; | |
1083 | trav->nfproto = (unsigned long)PDE(inode)->data; | |
1084 | return 0; | |
2e4e6a17 HW |
1085 | } |
1086 | ||
025d93d1 | 1087 | static const struct file_operations xt_target_ops = { |
2e4e6a17 | 1088 | .owner = THIS_MODULE, |
025d93d1 | 1089 | .open = xt_target_open, |
2e4e6a17 HW |
1090 | .read = seq_read, |
1091 | .llseek = seq_lseek, | |
eb132205 | 1092 | .release = seq_release_private, |
2e4e6a17 HW |
1093 | }; |
1094 | ||
1095 | #define FORMAT_TABLES "_tables_names" | |
1096 | #define FORMAT_MATCHES "_tables_matches" | |
1097 | #define FORMAT_TARGETS "_tables_targets" | |
1098 | ||
1099 | #endif /* CONFIG_PROC_FS */ | |
1100 | ||
2b95efe7 JE |
1101 | /** |
1102 | * xt_hook_link - set up hooks for a new table | |
1103 | * @table: table with metadata needed to set up hooks | |
1104 | * @fn: Hook function | |
1105 | * | |
1106 | * This function will take care of creating and registering the necessary | |
1107 | * Netfilter hooks for XT tables. | |
1108 | */ | |
1109 | struct nf_hook_ops *xt_hook_link(const struct xt_table *table, nf_hookfn *fn) | |
1110 | { | |
1111 | unsigned int hook_mask = table->valid_hooks; | |
1112 | uint8_t i, num_hooks = hweight32(hook_mask); | |
1113 | uint8_t hooknum; | |
1114 | struct nf_hook_ops *ops; | |
1115 | int ret; | |
1116 | ||
1117 | ops = kmalloc(sizeof(*ops) * num_hooks, GFP_KERNEL); | |
1118 | if (ops == NULL) | |
1119 | return ERR_PTR(-ENOMEM); | |
1120 | ||
1121 | for (i = 0, hooknum = 0; i < num_hooks && hook_mask != 0; | |
1122 | hook_mask >>= 1, ++hooknum) { | |
1123 | if (!(hook_mask & 1)) | |
1124 | continue; | |
1125 | ops[i].hook = fn; | |
1126 | ops[i].owner = table->me; | |
1127 | ops[i].pf = table->af; | |
1128 | ops[i].hooknum = hooknum; | |
1129 | ops[i].priority = table->priority; | |
1130 | ++i; | |
1131 | } | |
1132 | ||
1133 | ret = nf_register_hooks(ops, num_hooks); | |
1134 | if (ret < 0) { | |
1135 | kfree(ops); | |
1136 | return ERR_PTR(ret); | |
1137 | } | |
1138 | ||
1139 | return ops; | |
1140 | } | |
1141 | EXPORT_SYMBOL_GPL(xt_hook_link); | |
1142 | ||
1143 | /** | |
1144 | * xt_hook_unlink - remove hooks for a table | |
1145 | * @ops: nf_hook_ops array as returned by nf_hook_link | |
1146 | * @hook_mask: the very same mask that was passed to nf_hook_link | |
1147 | */ | |
1148 | void xt_hook_unlink(const struct xt_table *table, struct nf_hook_ops *ops) | |
1149 | { | |
1150 | nf_unregister_hooks(ops, hweight32(table->valid_hooks)); | |
1151 | kfree(ops); | |
1152 | } | |
1153 | EXPORT_SYMBOL_GPL(xt_hook_unlink); | |
1154 | ||
76108cea | 1155 | int xt_proto_init(struct net *net, u_int8_t af) |
2e4e6a17 HW |
1156 | { |
1157 | #ifdef CONFIG_PROC_FS | |
1158 | char buf[XT_FUNCTION_MAXNAMELEN]; | |
1159 | struct proc_dir_entry *proc; | |
1160 | #endif | |
1161 | ||
7e9c6eeb | 1162 | if (af >= ARRAY_SIZE(xt_prefix)) |
2e4e6a17 HW |
1163 | return -EINVAL; |
1164 | ||
1165 | ||
1166 | #ifdef CONFIG_PROC_FS | |
ce18afe5 | 1167 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1168 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
8b169240 DL |
1169 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_table_ops, |
1170 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
1171 | if (!proc) |
1172 | goto out; | |
2e4e6a17 | 1173 | |
ce18afe5 | 1174 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1175 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
8b169240 DL |
1176 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_match_ops, |
1177 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
1178 | if (!proc) |
1179 | goto out_remove_tables; | |
2e4e6a17 | 1180 | |
ce18afe5 | 1181 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1182 | strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
8b169240 DL |
1183 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_target_ops, |
1184 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
1185 | if (!proc) |
1186 | goto out_remove_matches; | |
2e4e6a17 HW |
1187 | #endif |
1188 | ||
1189 | return 0; | |
1190 | ||
1191 | #ifdef CONFIG_PROC_FS | |
1192 | out_remove_matches: | |
ce18afe5 | 1193 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1194 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
3cb609d5 | 1195 | proc_net_remove(net, buf); |
2e4e6a17 HW |
1196 | |
1197 | out_remove_tables: | |
ce18afe5 | 1198 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1199 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
3cb609d5 | 1200 | proc_net_remove(net, buf); |
2e4e6a17 HW |
1201 | out: |
1202 | return -1; | |
1203 | #endif | |
1204 | } | |
1205 | EXPORT_SYMBOL_GPL(xt_proto_init); | |
1206 | ||
76108cea | 1207 | void xt_proto_fini(struct net *net, u_int8_t af) |
2e4e6a17 HW |
1208 | { |
1209 | #ifdef CONFIG_PROC_FS | |
1210 | char buf[XT_FUNCTION_MAXNAMELEN]; | |
1211 | ||
ce18afe5 | 1212 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1213 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
3cb609d5 | 1214 | proc_net_remove(net, buf); |
2e4e6a17 | 1215 | |
ce18afe5 | 1216 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1217 | strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
3cb609d5 | 1218 | proc_net_remove(net, buf); |
2e4e6a17 | 1219 | |
ce18afe5 | 1220 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1221 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
3cb609d5 | 1222 | proc_net_remove(net, buf); |
2e4e6a17 HW |
1223 | #endif /*CONFIG_PROC_FS*/ |
1224 | } | |
1225 | EXPORT_SYMBOL_GPL(xt_proto_fini); | |
1226 | ||
8d870052 AD |
1227 | static int __net_init xt_net_init(struct net *net) |
1228 | { | |
1229 | int i; | |
1230 | ||
7e9c6eeb | 1231 | for (i = 0; i < NFPROTO_NUMPROTO; i++) |
8d870052 AD |
1232 | INIT_LIST_HEAD(&net->xt.tables[i]); |
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | static struct pernet_operations xt_net_ops = { | |
1237 | .init = xt_net_init, | |
1238 | }; | |
2e4e6a17 HW |
1239 | |
1240 | static int __init xt_init(void) | |
1241 | { | |
942e4a2b SH |
1242 | unsigned int i; |
1243 | int rv; | |
1244 | ||
1245 | for_each_possible_cpu(i) { | |
1246 | struct xt_info_lock *lock = &per_cpu(xt_info_locks, i); | |
1247 | spin_lock_init(&lock->lock); | |
1248 | lock->readers = 0; | |
1249 | } | |
2e4e6a17 | 1250 | |
7e9c6eeb | 1251 | xt = kmalloc(sizeof(struct xt_af) * NFPROTO_NUMPROTO, GFP_KERNEL); |
2e4e6a17 HW |
1252 | if (!xt) |
1253 | return -ENOMEM; | |
1254 | ||
7e9c6eeb | 1255 | for (i = 0; i < NFPROTO_NUMPROTO; i++) { |
9e19bb6d | 1256 | mutex_init(&xt[i].mutex); |
2722971c DM |
1257 | #ifdef CONFIG_COMPAT |
1258 | mutex_init(&xt[i].compat_mutex); | |
b386d9f5 | 1259 | xt[i].compat_offsets = NULL; |
2722971c | 1260 | #endif |
2e4e6a17 HW |
1261 | INIT_LIST_HEAD(&xt[i].target); |
1262 | INIT_LIST_HEAD(&xt[i].match); | |
2e4e6a17 | 1263 | } |
8d870052 AD |
1264 | rv = register_pernet_subsys(&xt_net_ops); |
1265 | if (rv < 0) | |
1266 | kfree(xt); | |
1267 | return rv; | |
2e4e6a17 HW |
1268 | } |
1269 | ||
1270 | static void __exit xt_fini(void) | |
1271 | { | |
8d870052 | 1272 | unregister_pernet_subsys(&xt_net_ops); |
2e4e6a17 HW |
1273 | kfree(xt); |
1274 | } | |
1275 | ||
1276 | module_init(xt_init); | |
1277 | module_exit(xt_fini); | |
1278 |