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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> | |
f229f6ce | 5 | * Copyright (C) 2006-2012 Patrick McHardy <kaber@trash.net> |
2e4e6a17 HW |
6 | * |
7 | * Based on existing ip_tables code which is | |
8 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
9 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | * | |
15 | */ | |
be91fd5e | 16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
2e4e6a17 | 17 | #include <linux/kernel.h> |
3a9a231d | 18 | #include <linux/module.h> |
2e4e6a17 HW |
19 | #include <linux/socket.h> |
20 | #include <linux/net.h> | |
21 | #include <linux/proc_fs.h> | |
22 | #include <linux/seq_file.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/vmalloc.h> | |
9e19bb6d | 25 | #include <linux/mutex.h> |
d7fe0f24 | 26 | #include <linux/mm.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
fbabf31e | 28 | #include <linux/audit.h> |
457c4cbc | 29 | #include <net/net_namespace.h> |
2e4e6a17 HW |
30 | |
31 | #include <linux/netfilter/x_tables.h> | |
32 | #include <linux/netfilter_arp.h> | |
e3eaa991 JE |
33 | #include <linux/netfilter_ipv4/ip_tables.h> |
34 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
35 | #include <linux/netfilter_arp/arp_tables.h> | |
9e19bb6d | 36 | |
2e4e6a17 HW |
37 | MODULE_LICENSE("GPL"); |
38 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
043ef46c | 39 | MODULE_DESCRIPTION("{ip,ip6,arp,eb}_tables backend module"); |
2e4e6a17 HW |
40 | |
41 | #define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1)) | |
42 | ||
b386d9f5 | 43 | struct compat_delta { |
255d0dc3 ED |
44 | unsigned int offset; /* offset in kernel */ |
45 | int delta; /* delta in 32bit user land */ | |
b386d9f5 PM |
46 | }; |
47 | ||
2e4e6a17 | 48 | struct xt_af { |
9e19bb6d | 49 | struct mutex mutex; |
2e4e6a17 HW |
50 | struct list_head match; |
51 | struct list_head target; | |
b386d9f5 | 52 | #ifdef CONFIG_COMPAT |
2722971c | 53 | struct mutex compat_mutex; |
255d0dc3 ED |
54 | struct compat_delta *compat_tab; |
55 | unsigned int number; /* number of slots in compat_tab[] */ | |
56 | unsigned int cur; /* number of used slots in compat_tab[] */ | |
b386d9f5 | 57 | #endif |
2e4e6a17 HW |
58 | }; |
59 | ||
60 | static struct xt_af *xt; | |
61 | ||
7e9c6eeb JE |
62 | static const char *const xt_prefix[NFPROTO_NUMPROTO] = { |
63 | [NFPROTO_UNSPEC] = "x", | |
64 | [NFPROTO_IPV4] = "ip", | |
65 | [NFPROTO_ARP] = "arp", | |
66 | [NFPROTO_BRIDGE] = "eb", | |
67 | [NFPROTO_IPV6] = "ip6", | |
37f9f733 PM |
68 | }; |
69 | ||
f3c5c1bf JE |
70 | /* Allow this many total (re)entries. */ |
71 | static const unsigned int xt_jumpstack_multiplier = 2; | |
72 | ||
2e4e6a17 | 73 | /* Registration hooks for targets. */ |
7926dbfa | 74 | int xt_register_target(struct xt_target *target) |
2e4e6a17 | 75 | { |
76108cea | 76 | u_int8_t af = target->family; |
2e4e6a17 | 77 | |
7926dbfa | 78 | mutex_lock(&xt[af].mutex); |
2e4e6a17 | 79 | list_add(&target->list, &xt[af].target); |
9e19bb6d | 80 | mutex_unlock(&xt[af].mutex); |
7926dbfa | 81 | return 0; |
2e4e6a17 HW |
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 | { | |
f68c5301 CG |
119 | while (n-- > 0) |
120 | xt_unregister_target(&target[n]); | |
52d9c42e PM |
121 | } |
122 | EXPORT_SYMBOL(xt_unregister_targets); | |
123 | ||
7926dbfa | 124 | int xt_register_match(struct xt_match *match) |
2e4e6a17 | 125 | { |
76108cea | 126 | u_int8_t af = match->family; |
2e4e6a17 | 127 | |
7926dbfa | 128 | mutex_lock(&xt[af].mutex); |
2e4e6a17 | 129 | list_add(&match->list, &xt[af].match); |
9e19bb6d | 130 | mutex_unlock(&xt[af].mutex); |
7926dbfa | 131 | return 0; |
2e4e6a17 HW |
132 | } |
133 | EXPORT_SYMBOL(xt_register_match); | |
134 | ||
135 | void | |
a45049c5 | 136 | xt_unregister_match(struct xt_match *match) |
2e4e6a17 | 137 | { |
76108cea | 138 | u_int8_t af = match->family; |
a45049c5 | 139 | |
9e19bb6d | 140 | mutex_lock(&xt[af].mutex); |
df0933dc | 141 | list_del(&match->list); |
9e19bb6d | 142 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
143 | } |
144 | EXPORT_SYMBOL(xt_unregister_match); | |
145 | ||
52d9c42e PM |
146 | int |
147 | xt_register_matches(struct xt_match *match, unsigned int n) | |
148 | { | |
149 | unsigned int i; | |
150 | int err = 0; | |
151 | ||
152 | for (i = 0; i < n; i++) { | |
153 | err = xt_register_match(&match[i]); | |
154 | if (err) | |
155 | goto err; | |
156 | } | |
157 | return err; | |
158 | ||
159 | err: | |
160 | if (i > 0) | |
161 | xt_unregister_matches(match, i); | |
162 | return err; | |
163 | } | |
164 | EXPORT_SYMBOL(xt_register_matches); | |
165 | ||
166 | void | |
167 | xt_unregister_matches(struct xt_match *match, unsigned int n) | |
168 | { | |
f68c5301 CG |
169 | while (n-- > 0) |
170 | xt_unregister_match(&match[n]); | |
52d9c42e PM |
171 | } |
172 | EXPORT_SYMBOL(xt_unregister_matches); | |
173 | ||
2e4e6a17 HW |
174 | |
175 | /* | |
176 | * These are weird, but module loading must not be done with mutex | |
177 | * held (since they will register), and we have to have a single | |
adb00ae2 | 178 | * function to use. |
2e4e6a17 HW |
179 | */ |
180 | ||
181 | /* Find match, grabs ref. Returns ERR_PTR() on error. */ | |
76108cea | 182 | struct xt_match *xt_find_match(u8 af, const char *name, u8 revision) |
2e4e6a17 HW |
183 | { |
184 | struct xt_match *m; | |
42046e2e | 185 | int err = -ENOENT; |
2e4e6a17 | 186 | |
7926dbfa | 187 | mutex_lock(&xt[af].mutex); |
2e4e6a17 HW |
188 | list_for_each_entry(m, &xt[af].match, list) { |
189 | if (strcmp(m->name, name) == 0) { | |
190 | if (m->revision == revision) { | |
191 | if (try_module_get(m->me)) { | |
9e19bb6d | 192 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
193 | return m; |
194 | } | |
195 | } else | |
196 | err = -EPROTOTYPE; /* Found something. */ | |
197 | } | |
198 | } | |
9e19bb6d | 199 | mutex_unlock(&xt[af].mutex); |
55b69e91 JE |
200 | |
201 | if (af != NFPROTO_UNSPEC) | |
202 | /* Try searching again in the family-independent list */ | |
203 | return xt_find_match(NFPROTO_UNSPEC, name, revision); | |
204 | ||
2e4e6a17 HW |
205 | return ERR_PTR(err); |
206 | } | |
207 | EXPORT_SYMBOL(xt_find_match); | |
208 | ||
fd0ec0e6 JE |
209 | struct xt_match * |
210 | xt_request_find_match(uint8_t nfproto, const char *name, uint8_t revision) | |
211 | { | |
212 | struct xt_match *match; | |
213 | ||
adb00ae2 SH |
214 | match = xt_find_match(nfproto, name, revision); |
215 | if (IS_ERR(match)) { | |
216 | request_module("%st_%s", xt_prefix[nfproto], name); | |
217 | match = xt_find_match(nfproto, name, revision); | |
218 | } | |
219 | ||
220 | return match; | |
fd0ec0e6 JE |
221 | } |
222 | EXPORT_SYMBOL_GPL(xt_request_find_match); | |
223 | ||
2e4e6a17 | 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; | |
42046e2e | 228 | int err = -ENOENT; |
2e4e6a17 | 229 | |
7926dbfa | 230 | mutex_lock(&xt[af].mutex); |
2e4e6a17 HW |
231 | list_for_each_entry(t, &xt[af].target, list) { |
232 | if (strcmp(t->name, name) == 0) { | |
233 | if (t->revision == revision) { | |
234 | if (try_module_get(t->me)) { | |
9e19bb6d | 235 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
236 | return t; |
237 | } | |
238 | } else | |
239 | err = -EPROTOTYPE; /* Found something. */ | |
240 | } | |
241 | } | |
9e19bb6d | 242 | mutex_unlock(&xt[af].mutex); |
55b69e91 JE |
243 | |
244 | if (af != NFPROTO_UNSPEC) | |
245 | /* Try searching again in the family-independent list */ | |
246 | return xt_find_target(NFPROTO_UNSPEC, name, revision); | |
247 | ||
2e4e6a17 HW |
248 | return ERR_PTR(err); |
249 | } | |
250 | EXPORT_SYMBOL(xt_find_target); | |
251 | ||
76108cea | 252 | struct xt_target *xt_request_find_target(u8 af, const char *name, u8 revision) |
2e4e6a17 HW |
253 | { |
254 | struct xt_target *target; | |
255 | ||
adb00ae2 SH |
256 | target = xt_find_target(af, name, revision); |
257 | if (IS_ERR(target)) { | |
258 | request_module("%st_%s", xt_prefix[af], name); | |
259 | target = xt_find_target(af, name, revision); | |
260 | } | |
261 | ||
262 | return target; | |
2e4e6a17 HW |
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 | ||
7926dbfa | 312 | mutex_lock(&xt[af].mutex); |
2e4e6a17 HW |
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 | ||
5b76c494 JE |
332 | static char * |
333 | textify_hooks(char *buf, size_t size, unsigned int mask, uint8_t nfproto) | |
45185364 | 334 | { |
5b76c494 | 335 | static const char *const inetbr_names[] = { |
45185364 JE |
336 | "PREROUTING", "INPUT", "FORWARD", |
337 | "OUTPUT", "POSTROUTING", "BROUTING", | |
338 | }; | |
5b76c494 JE |
339 | static const char *const arp_names[] = { |
340 | "INPUT", "FORWARD", "OUTPUT", | |
341 | }; | |
342 | const char *const *names; | |
343 | unsigned int i, max; | |
45185364 JE |
344 | char *p = buf; |
345 | bool np = false; | |
346 | int res; | |
347 | ||
5b76c494 JE |
348 | names = (nfproto == NFPROTO_ARP) ? arp_names : inetbr_names; |
349 | max = (nfproto == NFPROTO_ARP) ? ARRAY_SIZE(arp_names) : | |
350 | ARRAY_SIZE(inetbr_names); | |
45185364 | 351 | *p = '\0'; |
5b76c494 | 352 | for (i = 0; i < max; ++i) { |
45185364 JE |
353 | if (!(mask & (1 << i))) |
354 | continue; | |
355 | res = snprintf(p, size, "%s%s", np ? "/" : "", names[i]); | |
356 | if (res > 0) { | |
357 | size -= res; | |
358 | p += res; | |
359 | } | |
360 | np = true; | |
361 | } | |
362 | ||
363 | return buf; | |
364 | } | |
365 | ||
916a917d | 366 | int xt_check_match(struct xt_mtchk_param *par, |
9b4fce7a | 367 | unsigned int size, u_int8_t proto, bool inv_proto) |
37f9f733 | 368 | { |
bd414ee6 JE |
369 | int ret; |
370 | ||
9b4fce7a JE |
371 | if (XT_ALIGN(par->match->matchsize) != size && |
372 | par->match->matchsize != -1) { | |
043ef46c JE |
373 | /* |
374 | * ebt_among is exempt from centralized matchsize checking | |
375 | * because it uses a dynamic-size data set. | |
376 | */ | |
b402405d JE |
377 | pr_err("%s_tables: %s.%u match: invalid size " |
378 | "%u (kernel) != (user) %u\n", | |
916a917d | 379 | xt_prefix[par->family], par->match->name, |
b402405d | 380 | par->match->revision, |
9b4fce7a | 381 | XT_ALIGN(par->match->matchsize), size); |
37f9f733 PM |
382 | return -EINVAL; |
383 | } | |
9b4fce7a JE |
384 | if (par->match->table != NULL && |
385 | strcmp(par->match->table, par->table) != 0) { | |
3dd5d7e3 | 386 | pr_err("%s_tables: %s match: only valid in %s table, not %s\n", |
916a917d | 387 | xt_prefix[par->family], par->match->name, |
9b4fce7a | 388 | par->match->table, par->table); |
37f9f733 PM |
389 | return -EINVAL; |
390 | } | |
9b4fce7a | 391 | if (par->match->hooks && (par->hook_mask & ~par->match->hooks) != 0) { |
45185364 JE |
392 | char used[64], allow[64]; |
393 | ||
3dd5d7e3 | 394 | pr_err("%s_tables: %s match: used from hooks %s, but only " |
45185364 | 395 | "valid from %s\n", |
916a917d | 396 | xt_prefix[par->family], par->match->name, |
5b76c494 JE |
397 | textify_hooks(used, sizeof(used), par->hook_mask, |
398 | par->family), | |
399 | textify_hooks(allow, sizeof(allow), par->match->hooks, | |
400 | par->family)); | |
37f9f733 PM |
401 | return -EINVAL; |
402 | } | |
9b4fce7a | 403 | if (par->match->proto && (par->match->proto != proto || inv_proto)) { |
3dd5d7e3 | 404 | pr_err("%s_tables: %s match: only valid for protocol %u\n", |
916a917d JE |
405 | xt_prefix[par->family], par->match->name, |
406 | par->match->proto); | |
37f9f733 PM |
407 | return -EINVAL; |
408 | } | |
bd414ee6 JE |
409 | if (par->match->checkentry != NULL) { |
410 | ret = par->match->checkentry(par); | |
411 | if (ret < 0) | |
412 | return ret; | |
413 | else if (ret > 0) | |
414 | /* Flag up potential errors. */ | |
415 | return -EIO; | |
416 | } | |
37f9f733 PM |
417 | return 0; |
418 | } | |
419 | EXPORT_SYMBOL_GPL(xt_check_match); | |
420 | ||
2722971c | 421 | #ifdef CONFIG_COMPAT |
255d0dc3 | 422 | int xt_compat_add_offset(u_int8_t af, unsigned int offset, int delta) |
b386d9f5 | 423 | { |
255d0dc3 | 424 | struct xt_af *xp = &xt[af]; |
b386d9f5 | 425 | |
255d0dc3 ED |
426 | if (!xp->compat_tab) { |
427 | if (!xp->number) | |
428 | return -EINVAL; | |
429 | xp->compat_tab = vmalloc(sizeof(struct compat_delta) * xp->number); | |
430 | if (!xp->compat_tab) | |
431 | return -ENOMEM; | |
432 | xp->cur = 0; | |
433 | } | |
b386d9f5 | 434 | |
255d0dc3 ED |
435 | if (xp->cur >= xp->number) |
436 | return -EINVAL; | |
b386d9f5 | 437 | |
255d0dc3 ED |
438 | if (xp->cur) |
439 | delta += xp->compat_tab[xp->cur - 1].delta; | |
440 | xp->compat_tab[xp->cur].offset = offset; | |
441 | xp->compat_tab[xp->cur].delta = delta; | |
442 | xp->cur++; | |
b386d9f5 PM |
443 | return 0; |
444 | } | |
445 | EXPORT_SYMBOL_GPL(xt_compat_add_offset); | |
446 | ||
76108cea | 447 | void xt_compat_flush_offsets(u_int8_t af) |
b386d9f5 | 448 | { |
255d0dc3 ED |
449 | if (xt[af].compat_tab) { |
450 | vfree(xt[af].compat_tab); | |
451 | xt[af].compat_tab = NULL; | |
452 | xt[af].number = 0; | |
5a6351ee | 453 | xt[af].cur = 0; |
b386d9f5 PM |
454 | } |
455 | } | |
456 | EXPORT_SYMBOL_GPL(xt_compat_flush_offsets); | |
457 | ||
3e5e524f | 458 | int xt_compat_calc_jump(u_int8_t af, unsigned int offset) |
b386d9f5 | 459 | { |
255d0dc3 ED |
460 | struct compat_delta *tmp = xt[af].compat_tab; |
461 | int mid, left = 0, right = xt[af].cur - 1; | |
462 | ||
463 | while (left <= right) { | |
464 | mid = (left + right) >> 1; | |
465 | if (offset > tmp[mid].offset) | |
466 | left = mid + 1; | |
467 | else if (offset < tmp[mid].offset) | |
468 | right = mid - 1; | |
469 | else | |
470 | return mid ? tmp[mid - 1].delta : 0; | |
471 | } | |
5a6351ee | 472 | return left ? tmp[left - 1].delta : 0; |
b386d9f5 PM |
473 | } |
474 | EXPORT_SYMBOL_GPL(xt_compat_calc_jump); | |
475 | ||
255d0dc3 ED |
476 | void xt_compat_init_offsets(u_int8_t af, unsigned int number) |
477 | { | |
478 | xt[af].number = number; | |
479 | xt[af].cur = 0; | |
480 | } | |
481 | EXPORT_SYMBOL(xt_compat_init_offsets); | |
482 | ||
5452e425 | 483 | int xt_compat_match_offset(const struct xt_match *match) |
2722971c | 484 | { |
9fa492cd PM |
485 | u_int16_t csize = match->compatsize ? : match->matchsize; |
486 | return XT_ALIGN(match->matchsize) - COMPAT_XT_ALIGN(csize); | |
487 | } | |
488 | EXPORT_SYMBOL_GPL(xt_compat_match_offset); | |
489 | ||
89566951 | 490 | int xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr, |
b0a6363c | 491 | unsigned int *size) |
9fa492cd | 492 | { |
5452e425 | 493 | const struct xt_match *match = m->u.kernel.match; |
9fa492cd PM |
494 | struct compat_xt_entry_match *cm = (struct compat_xt_entry_match *)m; |
495 | int pad, off = xt_compat_match_offset(match); | |
496 | u_int16_t msize = cm->u.user.match_size; | |
497 | ||
498 | m = *dstptr; | |
499 | memcpy(m, cm, sizeof(*cm)); | |
500 | if (match->compat_from_user) | |
501 | match->compat_from_user(m->data, cm->data); | |
502 | else | |
503 | memcpy(m->data, cm->data, msize - sizeof(*cm)); | |
504 | pad = XT_ALIGN(match->matchsize) - match->matchsize; | |
505 | if (pad > 0) | |
506 | memset(m->data + match->matchsize, 0, pad); | |
507 | ||
508 | msize += off; | |
509 | m->u.user.match_size = msize; | |
510 | ||
511 | *size += off; | |
512 | *dstptr += msize; | |
89566951 | 513 | return 0; |
9fa492cd PM |
514 | } |
515 | EXPORT_SYMBOL_GPL(xt_compat_match_from_user); | |
516 | ||
739674fb JE |
517 | int xt_compat_match_to_user(const struct xt_entry_match *m, |
518 | void __user **dstptr, unsigned int *size) | |
9fa492cd | 519 | { |
5452e425 | 520 | const struct xt_match *match = m->u.kernel.match; |
9fa492cd PM |
521 | struct compat_xt_entry_match __user *cm = *dstptr; |
522 | int off = xt_compat_match_offset(match); | |
523 | u_int16_t msize = m->u.user.match_size - off; | |
524 | ||
525 | if (copy_to_user(cm, m, sizeof(*cm)) || | |
a18aa31b PM |
526 | put_user(msize, &cm->u.user.match_size) || |
527 | copy_to_user(cm->u.user.name, m->u.kernel.match->name, | |
528 | strlen(m->u.kernel.match->name) + 1)) | |
601e68e1 | 529 | return -EFAULT; |
9fa492cd PM |
530 | |
531 | if (match->compat_to_user) { | |
532 | if (match->compat_to_user((void __user *)cm->data, m->data)) | |
533 | return -EFAULT; | |
534 | } else { | |
535 | if (copy_to_user(cm->data, m->data, msize - sizeof(*cm))) | |
536 | return -EFAULT; | |
2722971c | 537 | } |
9fa492cd PM |
538 | |
539 | *size -= off; | |
540 | *dstptr += msize; | |
541 | return 0; | |
2722971c | 542 | } |
9fa492cd PM |
543 | EXPORT_SYMBOL_GPL(xt_compat_match_to_user); |
544 | #endif /* CONFIG_COMPAT */ | |
2722971c | 545 | |
916a917d | 546 | int xt_check_target(struct xt_tgchk_param *par, |
af5d6dc2 | 547 | unsigned int size, u_int8_t proto, bool inv_proto) |
37f9f733 | 548 | { |
d6b00a53 JE |
549 | int ret; |
550 | ||
af5d6dc2 | 551 | if (XT_ALIGN(par->target->targetsize) != size) { |
b402405d JE |
552 | pr_err("%s_tables: %s.%u target: invalid size " |
553 | "%u (kernel) != (user) %u\n", | |
916a917d | 554 | xt_prefix[par->family], par->target->name, |
b402405d | 555 | par->target->revision, |
af5d6dc2 | 556 | XT_ALIGN(par->target->targetsize), size); |
37f9f733 PM |
557 | return -EINVAL; |
558 | } | |
af5d6dc2 JE |
559 | if (par->target->table != NULL && |
560 | strcmp(par->target->table, par->table) != 0) { | |
3dd5d7e3 | 561 | pr_err("%s_tables: %s target: only valid in %s table, not %s\n", |
916a917d | 562 | xt_prefix[par->family], par->target->name, |
af5d6dc2 | 563 | par->target->table, par->table); |
37f9f733 PM |
564 | return -EINVAL; |
565 | } | |
af5d6dc2 | 566 | if (par->target->hooks && (par->hook_mask & ~par->target->hooks) != 0) { |
45185364 JE |
567 | char used[64], allow[64]; |
568 | ||
3dd5d7e3 | 569 | pr_err("%s_tables: %s target: used from hooks %s, but only " |
45185364 | 570 | "usable from %s\n", |
916a917d | 571 | xt_prefix[par->family], par->target->name, |
5b76c494 JE |
572 | textify_hooks(used, sizeof(used), par->hook_mask, |
573 | par->family), | |
574 | textify_hooks(allow, sizeof(allow), par->target->hooks, | |
575 | par->family)); | |
37f9f733 PM |
576 | return -EINVAL; |
577 | } | |
af5d6dc2 | 578 | if (par->target->proto && (par->target->proto != proto || inv_proto)) { |
3dd5d7e3 | 579 | pr_err("%s_tables: %s target: only valid for protocol %u\n", |
916a917d | 580 | xt_prefix[par->family], par->target->name, |
af5d6dc2 | 581 | par->target->proto); |
37f9f733 PM |
582 | return -EINVAL; |
583 | } | |
d6b00a53 JE |
584 | if (par->target->checkentry != NULL) { |
585 | ret = par->target->checkentry(par); | |
586 | if (ret < 0) | |
587 | return ret; | |
588 | else if (ret > 0) | |
589 | /* Flag up potential errors. */ | |
590 | return -EIO; | |
591 | } | |
37f9f733 PM |
592 | return 0; |
593 | } | |
594 | EXPORT_SYMBOL_GPL(xt_check_target); | |
595 | ||
2722971c | 596 | #ifdef CONFIG_COMPAT |
5452e425 | 597 | int xt_compat_target_offset(const struct xt_target *target) |
2722971c | 598 | { |
9fa492cd PM |
599 | u_int16_t csize = target->compatsize ? : target->targetsize; |
600 | return XT_ALIGN(target->targetsize) - COMPAT_XT_ALIGN(csize); | |
601 | } | |
602 | EXPORT_SYMBOL_GPL(xt_compat_target_offset); | |
603 | ||
604 | void xt_compat_target_from_user(struct xt_entry_target *t, void **dstptr, | |
b0a6363c | 605 | unsigned int *size) |
9fa492cd | 606 | { |
5452e425 | 607 | const struct xt_target *target = t->u.kernel.target; |
9fa492cd PM |
608 | struct compat_xt_entry_target *ct = (struct compat_xt_entry_target *)t; |
609 | int pad, off = xt_compat_target_offset(target); | |
610 | u_int16_t tsize = ct->u.user.target_size; | |
611 | ||
612 | t = *dstptr; | |
613 | memcpy(t, ct, sizeof(*ct)); | |
614 | if (target->compat_from_user) | |
615 | target->compat_from_user(t->data, ct->data); | |
616 | else | |
617 | memcpy(t->data, ct->data, tsize - sizeof(*ct)); | |
618 | pad = XT_ALIGN(target->targetsize) - target->targetsize; | |
619 | if (pad > 0) | |
620 | memset(t->data + target->targetsize, 0, pad); | |
621 | ||
622 | tsize += off; | |
623 | t->u.user.target_size = tsize; | |
624 | ||
625 | *size += off; | |
626 | *dstptr += tsize; | |
627 | } | |
628 | EXPORT_SYMBOL_GPL(xt_compat_target_from_user); | |
629 | ||
739674fb JE |
630 | int xt_compat_target_to_user(const struct xt_entry_target *t, |
631 | void __user **dstptr, unsigned int *size) | |
9fa492cd | 632 | { |
5452e425 | 633 | const struct xt_target *target = t->u.kernel.target; |
9fa492cd PM |
634 | struct compat_xt_entry_target __user *ct = *dstptr; |
635 | int off = xt_compat_target_offset(target); | |
636 | u_int16_t tsize = t->u.user.target_size - off; | |
637 | ||
638 | if (copy_to_user(ct, t, sizeof(*ct)) || | |
a18aa31b PM |
639 | put_user(tsize, &ct->u.user.target_size) || |
640 | copy_to_user(ct->u.user.name, t->u.kernel.target->name, | |
641 | strlen(t->u.kernel.target->name) + 1)) | |
601e68e1 | 642 | return -EFAULT; |
9fa492cd PM |
643 | |
644 | if (target->compat_to_user) { | |
645 | if (target->compat_to_user((void __user *)ct->data, t->data)) | |
646 | return -EFAULT; | |
647 | } else { | |
648 | if (copy_to_user(ct->data, t->data, tsize - sizeof(*ct))) | |
649 | return -EFAULT; | |
2722971c | 650 | } |
9fa492cd PM |
651 | |
652 | *size -= off; | |
653 | *dstptr += tsize; | |
654 | return 0; | |
2722971c | 655 | } |
9fa492cd | 656 | EXPORT_SYMBOL_GPL(xt_compat_target_to_user); |
2722971c DM |
657 | #endif |
658 | ||
2e4e6a17 HW |
659 | struct xt_table_info *xt_alloc_table_info(unsigned int size) |
660 | { | |
711bdde6 ED |
661 | struct xt_table_info *info = NULL; |
662 | size_t sz = sizeof(*info) + size; | |
2e4e6a17 HW |
663 | |
664 | /* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */ | |
4481374c | 665 | if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > totalram_pages) |
2e4e6a17 HW |
666 | return NULL; |
667 | ||
711bdde6 ED |
668 | if (sz <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) |
669 | info = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY); | |
670 | if (!info) { | |
671 | info = vmalloc(sz); | |
672 | if (!info) | |
673 | return NULL; | |
2e4e6a17 | 674 | } |
711bdde6 ED |
675 | memset(info, 0, sizeof(*info)); |
676 | info->size = size; | |
677 | return info; | |
2e4e6a17 HW |
678 | } |
679 | EXPORT_SYMBOL(xt_alloc_table_info); | |
680 | ||
681 | void xt_free_table_info(struct xt_table_info *info) | |
682 | { | |
683 | int cpu; | |
684 | ||
f3c5c1bf | 685 | if (info->jumpstack != NULL) { |
f6b50824 ED |
686 | for_each_possible_cpu(cpu) |
687 | kvfree(info->jumpstack[cpu]); | |
688 | kvfree(info->jumpstack); | |
f3c5c1bf JE |
689 | } |
690 | ||
7489aec8 | 691 | free_percpu(info->stackptr); |
f3c5c1bf | 692 | |
711bdde6 | 693 | kvfree(info); |
2e4e6a17 HW |
694 | } |
695 | EXPORT_SYMBOL(xt_free_table_info); | |
696 | ||
697 | /* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */ | |
76108cea JE |
698 | struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af, |
699 | const char *name) | |
2e4e6a17 HW |
700 | { |
701 | struct xt_table *t; | |
702 | ||
7926dbfa | 703 | mutex_lock(&xt[af].mutex); |
8d870052 | 704 | list_for_each_entry(t, &net->xt.tables[af], list) |
2e4e6a17 HW |
705 | if (strcmp(t->name, name) == 0 && try_module_get(t->me)) |
706 | return t; | |
9e19bb6d | 707 | mutex_unlock(&xt[af].mutex); |
2e4e6a17 HW |
708 | return NULL; |
709 | } | |
710 | EXPORT_SYMBOL_GPL(xt_find_table_lock); | |
711 | ||
712 | void xt_table_unlock(struct xt_table *table) | |
713 | { | |
9e19bb6d | 714 | mutex_unlock(&xt[table->af].mutex); |
2e4e6a17 HW |
715 | } |
716 | EXPORT_SYMBOL_GPL(xt_table_unlock); | |
717 | ||
2722971c | 718 | #ifdef CONFIG_COMPAT |
76108cea | 719 | void xt_compat_lock(u_int8_t af) |
2722971c DM |
720 | { |
721 | mutex_lock(&xt[af].compat_mutex); | |
722 | } | |
723 | EXPORT_SYMBOL_GPL(xt_compat_lock); | |
724 | ||
76108cea | 725 | void xt_compat_unlock(u_int8_t af) |
2722971c DM |
726 | { |
727 | mutex_unlock(&xt[af].compat_mutex); | |
728 | } | |
729 | EXPORT_SYMBOL_GPL(xt_compat_unlock); | |
730 | #endif | |
2e4e6a17 | 731 | |
7f5c6d4f ED |
732 | DEFINE_PER_CPU(seqcount_t, xt_recseq); |
733 | EXPORT_PER_CPU_SYMBOL_GPL(xt_recseq); | |
942e4a2b | 734 | |
f3c5c1bf JE |
735 | static int xt_jumpstack_alloc(struct xt_table_info *i) |
736 | { | |
737 | unsigned int size; | |
738 | int cpu; | |
739 | ||
7489aec8 | 740 | i->stackptr = alloc_percpu(unsigned int); |
f3c5c1bf JE |
741 | if (i->stackptr == NULL) |
742 | return -ENOMEM; | |
f3c5c1bf JE |
743 | |
744 | size = sizeof(void **) * nr_cpu_ids; | |
745 | if (size > PAGE_SIZE) | |
3dbd4439 | 746 | i->jumpstack = vzalloc(size); |
f3c5c1bf | 747 | else |
3dbd4439 | 748 | i->jumpstack = kzalloc(size, GFP_KERNEL); |
f3c5c1bf JE |
749 | if (i->jumpstack == NULL) |
750 | return -ENOMEM; | |
f3c5c1bf JE |
751 | |
752 | i->stacksize *= xt_jumpstack_multiplier; | |
753 | size = sizeof(void *) * i->stacksize; | |
754 | for_each_possible_cpu(cpu) { | |
755 | if (size > PAGE_SIZE) | |
756 | i->jumpstack[cpu] = vmalloc_node(size, | |
757 | cpu_to_node(cpu)); | |
758 | else | |
759 | i->jumpstack[cpu] = kmalloc_node(size, | |
760 | GFP_KERNEL, cpu_to_node(cpu)); | |
761 | if (i->jumpstack[cpu] == NULL) | |
762 | /* | |
763 | * Freeing will be done later on by the callers. The | |
764 | * chain is: xt_replace_table -> __do_replace -> | |
765 | * do_replace -> xt_free_table_info. | |
766 | */ | |
767 | return -ENOMEM; | |
768 | } | |
769 | ||
770 | return 0; | |
771 | } | |
942e4a2b | 772 | |
2e4e6a17 HW |
773 | struct xt_table_info * |
774 | xt_replace_table(struct xt_table *table, | |
775 | unsigned int num_counters, | |
776 | struct xt_table_info *newinfo, | |
777 | int *error) | |
778 | { | |
942e4a2b | 779 | struct xt_table_info *private; |
f3c5c1bf | 780 | int ret; |
2e4e6a17 | 781 | |
d97a9e47 JE |
782 | ret = xt_jumpstack_alloc(newinfo); |
783 | if (ret < 0) { | |
784 | *error = ret; | |
785 | return NULL; | |
786 | } | |
787 | ||
2e4e6a17 | 788 | /* Do the substitution. */ |
942e4a2b | 789 | local_bh_disable(); |
2e4e6a17 | 790 | private = table->private; |
942e4a2b | 791 | |
2e4e6a17 HW |
792 | /* Check inside lock: is the old number correct? */ |
793 | if (num_counters != private->number) { | |
be91fd5e | 794 | pr_debug("num_counters != table->private->number (%u/%u)\n", |
2e4e6a17 | 795 | num_counters, private->number); |
942e4a2b | 796 | local_bh_enable(); |
2e4e6a17 HW |
797 | *error = -EAGAIN; |
798 | return NULL; | |
799 | } | |
2e4e6a17 | 800 | |
942e4a2b | 801 | newinfo->initial_entries = private->initial_entries; |
b416c144 WD |
802 | /* |
803 | * Ensure contents of newinfo are visible before assigning to | |
804 | * private. | |
805 | */ | |
806 | smp_wmb(); | |
807 | table->private = newinfo; | |
942e4a2b SH |
808 | |
809 | /* | |
810 | * Even though table entries have now been swapped, other CPU's | |
811 | * may still be using the old entries. This is okay, because | |
812 | * resynchronization happens because of the locking done | |
813 | * during the get_counters() routine. | |
814 | */ | |
815 | local_bh_enable(); | |
816 | ||
fbabf31e TG |
817 | #ifdef CONFIG_AUDIT |
818 | if (audit_enabled) { | |
819 | struct audit_buffer *ab; | |
820 | ||
821 | ab = audit_log_start(current->audit_context, GFP_KERNEL, | |
822 | AUDIT_NETFILTER_CFG); | |
823 | if (ab) { | |
824 | audit_log_format(ab, "table=%s family=%u entries=%u", | |
825 | table->name, table->af, | |
826 | private->number); | |
827 | audit_log_end(ab); | |
828 | } | |
829 | } | |
830 | #endif | |
831 | ||
942e4a2b | 832 | return private; |
2e4e6a17 HW |
833 | } |
834 | EXPORT_SYMBOL_GPL(xt_replace_table); | |
835 | ||
35aad0ff JE |
836 | struct xt_table *xt_register_table(struct net *net, |
837 | const struct xt_table *input_table, | |
a98da11d AD |
838 | struct xt_table_info *bootstrap, |
839 | struct xt_table_info *newinfo) | |
2e4e6a17 HW |
840 | { |
841 | int ret; | |
842 | struct xt_table_info *private; | |
35aad0ff | 843 | struct xt_table *t, *table; |
2e4e6a17 | 844 | |
44d34e72 | 845 | /* Don't add one object to multiple lists. */ |
35aad0ff | 846 | table = kmemdup(input_table, sizeof(struct xt_table), GFP_KERNEL); |
44d34e72 AD |
847 | if (!table) { |
848 | ret = -ENOMEM; | |
849 | goto out; | |
850 | } | |
851 | ||
7926dbfa | 852 | mutex_lock(&xt[table->af].mutex); |
2e4e6a17 | 853 | /* Don't autoload: we'd eat our tail... */ |
8d870052 | 854 | list_for_each_entry(t, &net->xt.tables[table->af], list) { |
df0933dc PM |
855 | if (strcmp(t->name, table->name) == 0) { |
856 | ret = -EEXIST; | |
857 | goto unlock; | |
858 | } | |
2e4e6a17 HW |
859 | } |
860 | ||
861 | /* Simplifies replace_table code. */ | |
862 | table->private = bootstrap; | |
78454473 | 863 | |
2e4e6a17 HW |
864 | if (!xt_replace_table(table, 0, newinfo, &ret)) |
865 | goto unlock; | |
866 | ||
867 | private = table->private; | |
be91fd5e | 868 | pr_debug("table->private->number = %u\n", private->number); |
2e4e6a17 HW |
869 | |
870 | /* save number of initial entries */ | |
871 | private->initial_entries = private->number; | |
872 | ||
8d870052 | 873 | list_add(&table->list, &net->xt.tables[table->af]); |
a98da11d AD |
874 | mutex_unlock(&xt[table->af].mutex); |
875 | return table; | |
2e4e6a17 | 876 | |
7926dbfa | 877 | unlock: |
9e19bb6d | 878 | mutex_unlock(&xt[table->af].mutex); |
44d34e72 | 879 | kfree(table); |
a98da11d AD |
880 | out: |
881 | return ERR_PTR(ret); | |
2e4e6a17 HW |
882 | } |
883 | EXPORT_SYMBOL_GPL(xt_register_table); | |
884 | ||
885 | void *xt_unregister_table(struct xt_table *table) | |
886 | { | |
887 | struct xt_table_info *private; | |
888 | ||
9e19bb6d | 889 | mutex_lock(&xt[table->af].mutex); |
2e4e6a17 | 890 | private = table->private; |
df0933dc | 891 | list_del(&table->list); |
9e19bb6d | 892 | mutex_unlock(&xt[table->af].mutex); |
44d34e72 | 893 | kfree(table); |
2e4e6a17 HW |
894 | |
895 | return private; | |
896 | } | |
897 | EXPORT_SYMBOL_GPL(xt_unregister_table); | |
898 | ||
899 | #ifdef CONFIG_PROC_FS | |
715cf35a AD |
900 | struct xt_names_priv { |
901 | struct seq_net_private p; | |
76108cea | 902 | u_int8_t af; |
715cf35a | 903 | }; |
025d93d1 | 904 | static void *xt_table_seq_start(struct seq_file *seq, loff_t *pos) |
2e4e6a17 | 905 | { |
715cf35a | 906 | struct xt_names_priv *priv = seq->private; |
1218854a | 907 | struct net *net = seq_file_net(seq); |
76108cea | 908 | u_int8_t af = priv->af; |
2e4e6a17 | 909 | |
025d93d1 | 910 | mutex_lock(&xt[af].mutex); |
715cf35a | 911 | return seq_list_start(&net->xt.tables[af], *pos); |
025d93d1 | 912 | } |
2e4e6a17 | 913 | |
025d93d1 AD |
914 | static void *xt_table_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
915 | { | |
715cf35a | 916 | struct xt_names_priv *priv = seq->private; |
1218854a | 917 | struct net *net = seq_file_net(seq); |
76108cea | 918 | u_int8_t af = priv->af; |
2e4e6a17 | 919 | |
715cf35a | 920 | return seq_list_next(v, &net->xt.tables[af], pos); |
2e4e6a17 HW |
921 | } |
922 | ||
025d93d1 | 923 | static void xt_table_seq_stop(struct seq_file *seq, void *v) |
2e4e6a17 | 924 | { |
715cf35a | 925 | struct xt_names_priv *priv = seq->private; |
76108cea | 926 | u_int8_t af = priv->af; |
2e4e6a17 | 927 | |
025d93d1 AD |
928 | mutex_unlock(&xt[af].mutex); |
929 | } | |
2e4e6a17 | 930 | |
025d93d1 AD |
931 | static int xt_table_seq_show(struct seq_file *seq, void *v) |
932 | { | |
933 | struct xt_table *table = list_entry(v, struct xt_table, list); | |
2e4e6a17 | 934 | |
861fb107 | 935 | if (*table->name) |
e71456ae | 936 | seq_printf(seq, "%s\n", table->name); |
861fb107 | 937 | return 0; |
025d93d1 | 938 | } |
601e68e1 | 939 | |
025d93d1 AD |
940 | static const struct seq_operations xt_table_seq_ops = { |
941 | .start = xt_table_seq_start, | |
942 | .next = xt_table_seq_next, | |
943 | .stop = xt_table_seq_stop, | |
944 | .show = xt_table_seq_show, | |
945 | }; | |
946 | ||
947 | static int xt_table_open(struct inode *inode, struct file *file) | |
948 | { | |
949 | int ret; | |
715cf35a | 950 | struct xt_names_priv *priv; |
025d93d1 | 951 | |
715cf35a AD |
952 | ret = seq_open_net(inode, file, &xt_table_seq_ops, |
953 | sizeof(struct xt_names_priv)); | |
025d93d1 | 954 | if (!ret) { |
715cf35a | 955 | priv = ((struct seq_file *)file->private_data)->private; |
d9dda78b | 956 | priv->af = (unsigned long)PDE_DATA(inode); |
025d93d1 AD |
957 | } |
958 | return ret; | |
2e4e6a17 HW |
959 | } |
960 | ||
025d93d1 AD |
961 | static const struct file_operations xt_table_ops = { |
962 | .owner = THIS_MODULE, | |
963 | .open = xt_table_open, | |
964 | .read = seq_read, | |
965 | .llseek = seq_lseek, | |
0e93bb94 | 966 | .release = seq_release_net, |
025d93d1 AD |
967 | }; |
968 | ||
eb132205 JE |
969 | /* |
970 | * Traverse state for ip{,6}_{tables,matches} for helping crossing | |
971 | * the multi-AF mutexes. | |
972 | */ | |
973 | struct nf_mttg_trav { | |
974 | struct list_head *head, *curr; | |
975 | uint8_t class, nfproto; | |
976 | }; | |
977 | ||
978 | enum { | |
979 | MTTG_TRAV_INIT, | |
980 | MTTG_TRAV_NFP_UNSPEC, | |
981 | MTTG_TRAV_NFP_SPEC, | |
982 | MTTG_TRAV_DONE, | |
983 | }; | |
984 | ||
985 | static void *xt_mttg_seq_next(struct seq_file *seq, void *v, loff_t *ppos, | |
986 | bool is_target) | |
2e4e6a17 | 987 | { |
eb132205 JE |
988 | static const uint8_t next_class[] = { |
989 | [MTTG_TRAV_NFP_UNSPEC] = MTTG_TRAV_NFP_SPEC, | |
990 | [MTTG_TRAV_NFP_SPEC] = MTTG_TRAV_DONE, | |
991 | }; | |
992 | struct nf_mttg_trav *trav = seq->private; | |
993 | ||
994 | switch (trav->class) { | |
995 | case MTTG_TRAV_INIT: | |
996 | trav->class = MTTG_TRAV_NFP_UNSPEC; | |
997 | mutex_lock(&xt[NFPROTO_UNSPEC].mutex); | |
998 | trav->head = trav->curr = is_target ? | |
999 | &xt[NFPROTO_UNSPEC].target : &xt[NFPROTO_UNSPEC].match; | |
1000 | break; | |
1001 | case MTTG_TRAV_NFP_UNSPEC: | |
1002 | trav->curr = trav->curr->next; | |
1003 | if (trav->curr != trav->head) | |
1004 | break; | |
1005 | mutex_unlock(&xt[NFPROTO_UNSPEC].mutex); | |
1006 | mutex_lock(&xt[trav->nfproto].mutex); | |
1007 | trav->head = trav->curr = is_target ? | |
1008 | &xt[trav->nfproto].target : &xt[trav->nfproto].match; | |
1009 | trav->class = next_class[trav->class]; | |
1010 | break; | |
1011 | case MTTG_TRAV_NFP_SPEC: | |
1012 | trav->curr = trav->curr->next; | |
1013 | if (trav->curr != trav->head) | |
1014 | break; | |
1015 | /* fallthru, _stop will unlock */ | |
1016 | default: | |
1017 | return NULL; | |
1018 | } | |
2e4e6a17 | 1019 | |
eb132205 JE |
1020 | if (ppos != NULL) |
1021 | ++*ppos; | |
1022 | return trav; | |
025d93d1 | 1023 | } |
601e68e1 | 1024 | |
eb132205 JE |
1025 | static void *xt_mttg_seq_start(struct seq_file *seq, loff_t *pos, |
1026 | bool is_target) | |
025d93d1 | 1027 | { |
eb132205 JE |
1028 | struct nf_mttg_trav *trav = seq->private; |
1029 | unsigned int j; | |
2e4e6a17 | 1030 | |
eb132205 JE |
1031 | trav->class = MTTG_TRAV_INIT; |
1032 | for (j = 0; j < *pos; ++j) | |
1033 | if (xt_mttg_seq_next(seq, NULL, NULL, is_target) == NULL) | |
1034 | return NULL; | |
1035 | return trav; | |
2e4e6a17 HW |
1036 | } |
1037 | ||
eb132205 | 1038 | static void xt_mttg_seq_stop(struct seq_file *seq, void *v) |
2e4e6a17 | 1039 | { |
eb132205 JE |
1040 | struct nf_mttg_trav *trav = seq->private; |
1041 | ||
1042 | switch (trav->class) { | |
1043 | case MTTG_TRAV_NFP_UNSPEC: | |
1044 | mutex_unlock(&xt[NFPROTO_UNSPEC].mutex); | |
1045 | break; | |
1046 | case MTTG_TRAV_NFP_SPEC: | |
1047 | mutex_unlock(&xt[trav->nfproto].mutex); | |
1048 | break; | |
1049 | } | |
1050 | } | |
2e4e6a17 | 1051 | |
eb132205 JE |
1052 | static void *xt_match_seq_start(struct seq_file *seq, loff_t *pos) |
1053 | { | |
1054 | return xt_mttg_seq_start(seq, pos, false); | |
2e4e6a17 HW |
1055 | } |
1056 | ||
eb132205 | 1057 | static void *xt_match_seq_next(struct seq_file *seq, void *v, loff_t *ppos) |
2e4e6a17 | 1058 | { |
eb132205 JE |
1059 | return xt_mttg_seq_next(seq, v, ppos, false); |
1060 | } | |
2e4e6a17 | 1061 | |
eb132205 JE |
1062 | static int xt_match_seq_show(struct seq_file *seq, void *v) |
1063 | { | |
1064 | const struct nf_mttg_trav *trav = seq->private; | |
1065 | const struct xt_match *match; | |
1066 | ||
1067 | switch (trav->class) { | |
1068 | case MTTG_TRAV_NFP_UNSPEC: | |
1069 | case MTTG_TRAV_NFP_SPEC: | |
1070 | if (trav->curr == trav->head) | |
1071 | return 0; | |
1072 | match = list_entry(trav->curr, struct xt_match, list); | |
861fb107 JP |
1073 | if (*match->name) |
1074 | seq_printf(seq, "%s\n", match->name); | |
eb132205 JE |
1075 | } |
1076 | return 0; | |
2e4e6a17 HW |
1077 | } |
1078 | ||
025d93d1 AD |
1079 | static const struct seq_operations xt_match_seq_ops = { |
1080 | .start = xt_match_seq_start, | |
1081 | .next = xt_match_seq_next, | |
eb132205 | 1082 | .stop = xt_mttg_seq_stop, |
025d93d1 | 1083 | .show = xt_match_seq_show, |
2e4e6a17 HW |
1084 | }; |
1085 | ||
025d93d1 | 1086 | static int xt_match_open(struct inode *inode, struct file *file) |
2e4e6a17 | 1087 | { |
eb132205 | 1088 | struct nf_mttg_trav *trav; |
772476df RJ |
1089 | trav = __seq_open_private(file, &xt_match_seq_ops, sizeof(*trav)); |
1090 | if (!trav) | |
eb132205 | 1091 | return -ENOMEM; |
2e4e6a17 | 1092 | |
d9dda78b | 1093 | trav->nfproto = (unsigned long)PDE_DATA(inode); |
eb132205 | 1094 | return 0; |
025d93d1 AD |
1095 | } |
1096 | ||
1097 | static const struct file_operations xt_match_ops = { | |
1098 | .owner = THIS_MODULE, | |
1099 | .open = xt_match_open, | |
1100 | .read = seq_read, | |
1101 | .llseek = seq_lseek, | |
eb132205 | 1102 | .release = seq_release_private, |
025d93d1 | 1103 | }; |
2e4e6a17 | 1104 | |
025d93d1 AD |
1105 | static void *xt_target_seq_start(struct seq_file *seq, loff_t *pos) |
1106 | { | |
eb132205 | 1107 | return xt_mttg_seq_start(seq, pos, true); |
025d93d1 AD |
1108 | } |
1109 | ||
eb132205 | 1110 | static void *xt_target_seq_next(struct seq_file *seq, void *v, loff_t *ppos) |
025d93d1 | 1111 | { |
eb132205 | 1112 | return xt_mttg_seq_next(seq, v, ppos, true); |
025d93d1 AD |
1113 | } |
1114 | ||
1115 | static int xt_target_seq_show(struct seq_file *seq, void *v) | |
1116 | { | |
eb132205 JE |
1117 | const struct nf_mttg_trav *trav = seq->private; |
1118 | const struct xt_target *target; | |
1119 | ||
1120 | switch (trav->class) { | |
1121 | case MTTG_TRAV_NFP_UNSPEC: | |
1122 | case MTTG_TRAV_NFP_SPEC: | |
1123 | if (trav->curr == trav->head) | |
1124 | return 0; | |
1125 | target = list_entry(trav->curr, struct xt_target, list); | |
861fb107 JP |
1126 | if (*target->name) |
1127 | seq_printf(seq, "%s\n", target->name); | |
eb132205 JE |
1128 | } |
1129 | return 0; | |
025d93d1 AD |
1130 | } |
1131 | ||
1132 | static const struct seq_operations xt_target_seq_ops = { | |
1133 | .start = xt_target_seq_start, | |
1134 | .next = xt_target_seq_next, | |
eb132205 | 1135 | .stop = xt_mttg_seq_stop, |
025d93d1 AD |
1136 | .show = xt_target_seq_show, |
1137 | }; | |
1138 | ||
1139 | static int xt_target_open(struct inode *inode, struct file *file) | |
1140 | { | |
eb132205 | 1141 | struct nf_mttg_trav *trav; |
772476df RJ |
1142 | trav = __seq_open_private(file, &xt_target_seq_ops, sizeof(*trav)); |
1143 | if (!trav) | |
eb132205 | 1144 | return -ENOMEM; |
025d93d1 | 1145 | |
d9dda78b | 1146 | trav->nfproto = (unsigned long)PDE_DATA(inode); |
eb132205 | 1147 | return 0; |
2e4e6a17 HW |
1148 | } |
1149 | ||
025d93d1 | 1150 | static const struct file_operations xt_target_ops = { |
2e4e6a17 | 1151 | .owner = THIS_MODULE, |
025d93d1 | 1152 | .open = xt_target_open, |
2e4e6a17 HW |
1153 | .read = seq_read, |
1154 | .llseek = seq_lseek, | |
eb132205 | 1155 | .release = seq_release_private, |
2e4e6a17 HW |
1156 | }; |
1157 | ||
1158 | #define FORMAT_TABLES "_tables_names" | |
1159 | #define FORMAT_MATCHES "_tables_matches" | |
1160 | #define FORMAT_TARGETS "_tables_targets" | |
1161 | ||
1162 | #endif /* CONFIG_PROC_FS */ | |
1163 | ||
2b95efe7 JE |
1164 | /** |
1165 | * xt_hook_link - set up hooks for a new table | |
1166 | * @table: table with metadata needed to set up hooks | |
1167 | * @fn: Hook function | |
1168 | * | |
1169 | * This function will take care of creating and registering the necessary | |
1170 | * Netfilter hooks for XT tables. | |
1171 | */ | |
1172 | struct nf_hook_ops *xt_hook_link(const struct xt_table *table, nf_hookfn *fn) | |
1173 | { | |
1174 | unsigned int hook_mask = table->valid_hooks; | |
1175 | uint8_t i, num_hooks = hweight32(hook_mask); | |
1176 | uint8_t hooknum; | |
1177 | struct nf_hook_ops *ops; | |
1178 | int ret; | |
1179 | ||
1180 | ops = kmalloc(sizeof(*ops) * num_hooks, GFP_KERNEL); | |
1181 | if (ops == NULL) | |
1182 | return ERR_PTR(-ENOMEM); | |
1183 | ||
1184 | for (i = 0, hooknum = 0; i < num_hooks && hook_mask != 0; | |
1185 | hook_mask >>= 1, ++hooknum) { | |
1186 | if (!(hook_mask & 1)) | |
1187 | continue; | |
1188 | ops[i].hook = fn; | |
1189 | ops[i].owner = table->me; | |
1190 | ops[i].pf = table->af; | |
1191 | ops[i].hooknum = hooknum; | |
1192 | ops[i].priority = table->priority; | |
1193 | ++i; | |
1194 | } | |
1195 | ||
1196 | ret = nf_register_hooks(ops, num_hooks); | |
1197 | if (ret < 0) { | |
1198 | kfree(ops); | |
1199 | return ERR_PTR(ret); | |
1200 | } | |
1201 | ||
1202 | return ops; | |
1203 | } | |
1204 | EXPORT_SYMBOL_GPL(xt_hook_link); | |
1205 | ||
1206 | /** | |
1207 | * xt_hook_unlink - remove hooks for a table | |
1208 | * @ops: nf_hook_ops array as returned by nf_hook_link | |
1209 | * @hook_mask: the very same mask that was passed to nf_hook_link | |
1210 | */ | |
1211 | void xt_hook_unlink(const struct xt_table *table, struct nf_hook_ops *ops) | |
1212 | { | |
1213 | nf_unregister_hooks(ops, hweight32(table->valid_hooks)); | |
1214 | kfree(ops); | |
1215 | } | |
1216 | EXPORT_SYMBOL_GPL(xt_hook_unlink); | |
1217 | ||
76108cea | 1218 | int xt_proto_init(struct net *net, u_int8_t af) |
2e4e6a17 HW |
1219 | { |
1220 | #ifdef CONFIG_PROC_FS | |
1221 | char buf[XT_FUNCTION_MAXNAMELEN]; | |
1222 | struct proc_dir_entry *proc; | |
1223 | #endif | |
1224 | ||
7e9c6eeb | 1225 | if (af >= ARRAY_SIZE(xt_prefix)) |
2e4e6a17 HW |
1226 | return -EINVAL; |
1227 | ||
1228 | ||
1229 | #ifdef CONFIG_PROC_FS | |
ce18afe5 | 1230 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1231 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
8b169240 DL |
1232 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_table_ops, |
1233 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
1234 | if (!proc) |
1235 | goto out; | |
2e4e6a17 | 1236 | |
ce18afe5 | 1237 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1238 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
8b169240 DL |
1239 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_match_ops, |
1240 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
1241 | if (!proc) |
1242 | goto out_remove_tables; | |
2e4e6a17 | 1243 | |
ce18afe5 | 1244 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1245 | strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
8b169240 DL |
1246 | proc = proc_create_data(buf, 0440, net->proc_net, &xt_target_ops, |
1247 | (void *)(unsigned long)af); | |
2e4e6a17 HW |
1248 | if (!proc) |
1249 | goto out_remove_matches; | |
2e4e6a17 HW |
1250 | #endif |
1251 | ||
1252 | return 0; | |
1253 | ||
1254 | #ifdef CONFIG_PROC_FS | |
1255 | out_remove_matches: | |
ce18afe5 | 1256 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1257 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
ece31ffd | 1258 | remove_proc_entry(buf, net->proc_net); |
2e4e6a17 HW |
1259 | |
1260 | out_remove_tables: | |
ce18afe5 | 1261 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1262 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
ece31ffd | 1263 | remove_proc_entry(buf, net->proc_net); |
2e4e6a17 HW |
1264 | out: |
1265 | return -1; | |
1266 | #endif | |
1267 | } | |
1268 | EXPORT_SYMBOL_GPL(xt_proto_init); | |
1269 | ||
76108cea | 1270 | void xt_proto_fini(struct net *net, u_int8_t af) |
2e4e6a17 HW |
1271 | { |
1272 | #ifdef CONFIG_PROC_FS | |
1273 | char buf[XT_FUNCTION_MAXNAMELEN]; | |
1274 | ||
ce18afe5 | 1275 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1276 | strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
ece31ffd | 1277 | remove_proc_entry(buf, net->proc_net); |
2e4e6a17 | 1278 | |
ce18afe5 | 1279 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1280 | strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
ece31ffd | 1281 | remove_proc_entry(buf, net->proc_net); |
2e4e6a17 | 1282 | |
ce18afe5 | 1283 | strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17 | 1284 | strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
ece31ffd | 1285 | remove_proc_entry(buf, net->proc_net); |
2e4e6a17 HW |
1286 | #endif /*CONFIG_PROC_FS*/ |
1287 | } | |
1288 | EXPORT_SYMBOL_GPL(xt_proto_fini); | |
1289 | ||
8d870052 AD |
1290 | static int __net_init xt_net_init(struct net *net) |
1291 | { | |
1292 | int i; | |
1293 | ||
7e9c6eeb | 1294 | for (i = 0; i < NFPROTO_NUMPROTO; i++) |
8d870052 AD |
1295 | INIT_LIST_HEAD(&net->xt.tables[i]); |
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | static struct pernet_operations xt_net_ops = { | |
1300 | .init = xt_net_init, | |
1301 | }; | |
2e4e6a17 HW |
1302 | |
1303 | static int __init xt_init(void) | |
1304 | { | |
942e4a2b SH |
1305 | unsigned int i; |
1306 | int rv; | |
1307 | ||
1308 | for_each_possible_cpu(i) { | |
7f5c6d4f | 1309 | seqcount_init(&per_cpu(xt_recseq, i)); |
942e4a2b | 1310 | } |
2e4e6a17 | 1311 | |
7e9c6eeb | 1312 | xt = kmalloc(sizeof(struct xt_af) * NFPROTO_NUMPROTO, GFP_KERNEL); |
2e4e6a17 HW |
1313 | if (!xt) |
1314 | return -ENOMEM; | |
1315 | ||
7e9c6eeb | 1316 | for (i = 0; i < NFPROTO_NUMPROTO; i++) { |
9e19bb6d | 1317 | mutex_init(&xt[i].mutex); |
2722971c DM |
1318 | #ifdef CONFIG_COMPAT |
1319 | mutex_init(&xt[i].compat_mutex); | |
255d0dc3 | 1320 | xt[i].compat_tab = NULL; |
2722971c | 1321 | #endif |
2e4e6a17 HW |
1322 | INIT_LIST_HEAD(&xt[i].target); |
1323 | INIT_LIST_HEAD(&xt[i].match); | |
2e4e6a17 | 1324 | } |
8d870052 AD |
1325 | rv = register_pernet_subsys(&xt_net_ops); |
1326 | if (rv < 0) | |
1327 | kfree(xt); | |
1328 | return rv; | |
2e4e6a17 HW |
1329 | } |
1330 | ||
1331 | static void __exit xt_fini(void) | |
1332 | { | |
8d870052 | 1333 | unregister_pernet_subsys(&xt_net_ops); |
2e4e6a17 HW |
1334 | kfree(xt); |
1335 | } | |
1336 | ||
1337 | module_init(xt_init); | |
1338 | module_exit(xt_fini); | |
1339 |