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a7b4f989 JK |
1 | /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu> |
2 | * Patrick Schaaf <bof@bof.de> | |
3 | * Copyright (C) 2003-2011 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | /* Kernel module for IP set management */ | |
11 | ||
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/moduleparam.h> | |
15 | #include <linux/ip.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/spinlock.h> | |
18 | #include <linux/netlink.h> | |
19 | #include <linux/rculist.h> | |
20 | #include <linux/version.h> | |
21 | #include <net/netlink.h> | |
22 | ||
23 | #include <linux/netfilter.h> | |
24 | #include <linux/netfilter/nfnetlink.h> | |
25 | #include <linux/netfilter/ipset/ip_set.h> | |
26 | ||
27 | static LIST_HEAD(ip_set_type_list); /* all registered set types */ | |
28 | static DEFINE_MUTEX(ip_set_type_mutex); /* protects ip_set_type_list */ | |
2f9f28b2 | 29 | static DEFINE_RWLOCK(ip_set_ref_lock); /* protects the set refs */ |
a7b4f989 JK |
30 | |
31 | static struct ip_set **ip_set_list; /* all individual sets */ | |
32 | static ip_set_id_t ip_set_max = CONFIG_IP_SET_MAX; /* max number of sets */ | |
33 | ||
34 | #define STREQ(a, b) (strncmp(a, b, IPSET_MAXNAMELEN) == 0) | |
35 | ||
36 | static unsigned int max_sets; | |
37 | ||
38 | module_param(max_sets, int, 0600); | |
39 | MODULE_PARM_DESC(max_sets, "maximal number of sets"); | |
40 | MODULE_LICENSE("GPL"); | |
41 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); | |
42 | MODULE_DESCRIPTION("core IP set support"); | |
43 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_IPSET); | |
44 | ||
45 | /* | |
46 | * The set types are implemented in modules and registered set types | |
47 | * can be found in ip_set_type_list. Adding/deleting types is | |
48 | * serialized by ip_set_type_mutex. | |
49 | */ | |
50 | ||
51 | static inline void | |
52 | ip_set_type_lock(void) | |
53 | { | |
54 | mutex_lock(&ip_set_type_mutex); | |
55 | } | |
56 | ||
57 | static inline void | |
58 | ip_set_type_unlock(void) | |
59 | { | |
60 | mutex_unlock(&ip_set_type_mutex); | |
61 | } | |
62 | ||
63 | /* Register and deregister settype */ | |
64 | ||
65 | static struct ip_set_type * | |
66 | find_set_type(const char *name, u8 family, u8 revision) | |
67 | { | |
68 | struct ip_set_type *type; | |
69 | ||
70 | list_for_each_entry_rcu(type, &ip_set_type_list, list) | |
71 | if (STREQ(type->name, name) && | |
72 | (type->family == family || type->family == AF_UNSPEC) && | |
73 | type->revision == revision) | |
74 | return type; | |
75 | return NULL; | |
76 | } | |
77 | ||
78 | /* Unlock, try to load a set type module and lock again */ | |
79 | static int | |
80 | try_to_load_type(const char *name) | |
81 | { | |
82 | nfnl_unlock(); | |
83 | pr_debug("try to load ip_set_%s\n", name); | |
84 | if (request_module("ip_set_%s", name) < 0) { | |
85 | pr_warning("Can't find ip_set type %s\n", name); | |
86 | nfnl_lock(); | |
87 | return -IPSET_ERR_FIND_TYPE; | |
88 | } | |
89 | nfnl_lock(); | |
90 | return -EAGAIN; | |
91 | } | |
92 | ||
93 | /* Find a set type and reference it */ | |
94 | static int | |
95 | find_set_type_get(const char *name, u8 family, u8 revision, | |
96 | struct ip_set_type **found) | |
97 | { | |
5c1aba46 JK |
98 | struct ip_set_type *type; |
99 | int err; | |
100 | ||
a7b4f989 JK |
101 | rcu_read_lock(); |
102 | *found = find_set_type(name, family, revision); | |
103 | if (*found) { | |
5c1aba46 JK |
104 | err = !try_module_get((*found)->me) ? -EFAULT : 0; |
105 | goto unlock; | |
a7b4f989 | 106 | } |
5c1aba46 JK |
107 | /* Make sure the type is loaded but we don't support the revision */ |
108 | list_for_each_entry_rcu(type, &ip_set_type_list, list) | |
109 | if (STREQ(type->name, name)) { | |
110 | err = -IPSET_ERR_FIND_TYPE; | |
111 | goto unlock; | |
112 | } | |
a7b4f989 JK |
113 | rcu_read_unlock(); |
114 | ||
115 | return try_to_load_type(name); | |
5c1aba46 JK |
116 | |
117 | unlock: | |
118 | rcu_read_unlock(); | |
119 | return err; | |
a7b4f989 JK |
120 | } |
121 | ||
122 | /* Find a given set type by name and family. | |
123 | * If we succeeded, the supported minimal and maximum revisions are | |
124 | * filled out. | |
125 | */ | |
126 | static int | |
127 | find_set_type_minmax(const char *name, u8 family, u8 *min, u8 *max) | |
128 | { | |
129 | struct ip_set_type *type; | |
130 | bool found = false; | |
131 | ||
5c1aba46 | 132 | *min = 255; *max = 0; |
a7b4f989 JK |
133 | rcu_read_lock(); |
134 | list_for_each_entry_rcu(type, &ip_set_type_list, list) | |
135 | if (STREQ(type->name, name) && | |
136 | (type->family == family || type->family == AF_UNSPEC)) { | |
137 | found = true; | |
138 | if (type->revision < *min) | |
139 | *min = type->revision; | |
5c1aba46 | 140 | if (type->revision > *max) |
a7b4f989 JK |
141 | *max = type->revision; |
142 | } | |
143 | rcu_read_unlock(); | |
144 | if (found) | |
145 | return 0; | |
146 | ||
147 | return try_to_load_type(name); | |
148 | } | |
149 | ||
150 | #define family_name(f) ((f) == AF_INET ? "inet" : \ | |
151 | (f) == AF_INET6 ? "inet6" : "any") | |
152 | ||
153 | /* Register a set type structure. The type is identified by | |
154 | * the unique triple of name, family and revision. | |
155 | */ | |
156 | int | |
157 | ip_set_type_register(struct ip_set_type *type) | |
158 | { | |
159 | int ret = 0; | |
160 | ||
161 | if (type->protocol != IPSET_PROTOCOL) { | |
162 | pr_warning("ip_set type %s, family %s, revision %u uses " | |
163 | "wrong protocol version %u (want %u)\n", | |
164 | type->name, family_name(type->family), | |
165 | type->revision, type->protocol, IPSET_PROTOCOL); | |
166 | return -EINVAL; | |
167 | } | |
168 | ||
169 | ip_set_type_lock(); | |
170 | if (find_set_type(type->name, type->family, type->revision)) { | |
171 | /* Duplicate! */ | |
172 | pr_warning("ip_set type %s, family %s, revision %u " | |
173 | "already registered!\n", type->name, | |
174 | family_name(type->family), type->revision); | |
175 | ret = -EINVAL; | |
176 | goto unlock; | |
177 | } | |
178 | list_add_rcu(&type->list, &ip_set_type_list); | |
179 | pr_debug("type %s, family %s, revision %u registered.\n", | |
180 | type->name, family_name(type->family), type->revision); | |
181 | unlock: | |
182 | ip_set_type_unlock(); | |
183 | return ret; | |
184 | } | |
185 | EXPORT_SYMBOL_GPL(ip_set_type_register); | |
186 | ||
187 | /* Unregister a set type. There's a small race with ip_set_create */ | |
188 | void | |
189 | ip_set_type_unregister(struct ip_set_type *type) | |
190 | { | |
191 | ip_set_type_lock(); | |
192 | if (!find_set_type(type->name, type->family, type->revision)) { | |
193 | pr_warning("ip_set type %s, family %s, revision %u " | |
194 | "not registered\n", type->name, | |
195 | family_name(type->family), type->revision); | |
196 | goto unlock; | |
197 | } | |
198 | list_del_rcu(&type->list); | |
199 | pr_debug("type %s, family %s, revision %u unregistered.\n", | |
200 | type->name, family_name(type->family), type->revision); | |
201 | unlock: | |
202 | ip_set_type_unlock(); | |
203 | ||
204 | synchronize_rcu(); | |
205 | } | |
206 | EXPORT_SYMBOL_GPL(ip_set_type_unregister); | |
207 | ||
208 | /* Utility functions */ | |
209 | void * | |
210 | ip_set_alloc(size_t size) | |
211 | { | |
212 | void *members = NULL; | |
213 | ||
214 | if (size < KMALLOC_MAX_SIZE) | |
215 | members = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); | |
216 | ||
217 | if (members) { | |
218 | pr_debug("%p: allocated with kmalloc\n", members); | |
219 | return members; | |
220 | } | |
221 | ||
222 | members = vzalloc(size); | |
223 | if (!members) | |
224 | return NULL; | |
225 | pr_debug("%p: allocated with vmalloc\n", members); | |
226 | ||
227 | return members; | |
228 | } | |
229 | EXPORT_SYMBOL_GPL(ip_set_alloc); | |
230 | ||
231 | void | |
232 | ip_set_free(void *members) | |
233 | { | |
234 | pr_debug("%p: free with %s\n", members, | |
235 | is_vmalloc_addr(members) ? "vfree" : "kfree"); | |
236 | if (is_vmalloc_addr(members)) | |
237 | vfree(members); | |
238 | else | |
239 | kfree(members); | |
240 | } | |
241 | EXPORT_SYMBOL_GPL(ip_set_free); | |
242 | ||
243 | static inline bool | |
244 | flag_nested(const struct nlattr *nla) | |
245 | { | |
246 | return nla->nla_type & NLA_F_NESTED; | |
247 | } | |
248 | ||
249 | static const struct nla_policy ipaddr_policy[IPSET_ATTR_IPADDR_MAX + 1] = { | |
250 | [IPSET_ATTR_IPADDR_IPV4] = { .type = NLA_U32 }, | |
251 | [IPSET_ATTR_IPADDR_IPV6] = { .type = NLA_BINARY, | |
252 | .len = sizeof(struct in6_addr) }, | |
253 | }; | |
254 | ||
255 | int | |
256 | ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr) | |
257 | { | |
258 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX+1]; | |
259 | ||
260 | if (unlikely(!flag_nested(nla))) | |
261 | return -IPSET_ERR_PROTOCOL; | |
8da560ce | 262 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy)) |
a7b4f989 JK |
263 | return -IPSET_ERR_PROTOCOL; |
264 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV4))) | |
265 | return -IPSET_ERR_PROTOCOL; | |
266 | ||
267 | *ipaddr = nla_get_be32(tb[IPSET_ATTR_IPADDR_IPV4]); | |
268 | return 0; | |
269 | } | |
270 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr4); | |
271 | ||
272 | int | |
273 | ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr) | |
274 | { | |
275 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX+1]; | |
276 | ||
277 | if (unlikely(!flag_nested(nla))) | |
278 | return -IPSET_ERR_PROTOCOL; | |
279 | ||
8da560ce | 280 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy)) |
a7b4f989 JK |
281 | return -IPSET_ERR_PROTOCOL; |
282 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV6))) | |
283 | return -IPSET_ERR_PROTOCOL; | |
284 | ||
285 | memcpy(ipaddr, nla_data(tb[IPSET_ATTR_IPADDR_IPV6]), | |
286 | sizeof(struct in6_addr)); | |
287 | return 0; | |
288 | } | |
289 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr6); | |
290 | ||
291 | /* | |
292 | * Creating/destroying/renaming/swapping affect the existence and | |
293 | * the properties of a set. All of these can be executed from userspace | |
294 | * only and serialized by the nfnl mutex indirectly from nfnetlink. | |
295 | * | |
296 | * Sets are identified by their index in ip_set_list and the index | |
297 | * is used by the external references (set/SET netfilter modules). | |
298 | * | |
299 | * The set behind an index may change by swapping only, from userspace. | |
300 | */ | |
301 | ||
302 | static inline void | |
303 | __ip_set_get(ip_set_id_t index) | |
304 | { | |
2f9f28b2 JK |
305 | write_lock_bh(&ip_set_ref_lock); |
306 | ip_set_list[index]->ref++; | |
307 | write_unlock_bh(&ip_set_ref_lock); | |
a7b4f989 JK |
308 | } |
309 | ||
310 | static inline void | |
311 | __ip_set_put(ip_set_id_t index) | |
312 | { | |
2f9f28b2 JK |
313 | write_lock_bh(&ip_set_ref_lock); |
314 | BUG_ON(ip_set_list[index]->ref == 0); | |
315 | ip_set_list[index]->ref--; | |
316 | write_unlock_bh(&ip_set_ref_lock); | |
a7b4f989 JK |
317 | } |
318 | ||
319 | /* | |
320 | * Add, del and test set entries from kernel. | |
321 | * | |
322 | * The set behind the index must exist and must be referenced | |
323 | * so it can't be destroyed (or changed) under our foot. | |
324 | */ | |
325 | ||
326 | int | |
327 | ip_set_test(ip_set_id_t index, const struct sk_buff *skb, | |
328 | u8 family, u8 dim, u8 flags) | |
329 | { | |
330 | struct ip_set *set = ip_set_list[index]; | |
331 | int ret = 0; | |
332 | ||
2f9f28b2 | 333 | BUG_ON(set == NULL); |
a7b4f989 JK |
334 | pr_debug("set %s, index %u\n", set->name, index); |
335 | ||
336 | if (dim < set->type->dimension || | |
337 | !(family == set->family || set->family == AF_UNSPEC)) | |
338 | return 0; | |
339 | ||
340 | read_lock_bh(&set->lock); | |
341 | ret = set->variant->kadt(set, skb, IPSET_TEST, family, dim, flags); | |
342 | read_unlock_bh(&set->lock); | |
343 | ||
344 | if (ret == -EAGAIN) { | |
345 | /* Type requests element to be completed */ | |
346 | pr_debug("element must be competed, ADD is triggered\n"); | |
347 | write_lock_bh(&set->lock); | |
348 | set->variant->kadt(set, skb, IPSET_ADD, family, dim, flags); | |
349 | write_unlock_bh(&set->lock); | |
350 | ret = 1; | |
351 | } | |
352 | ||
353 | /* Convert error codes to nomatch */ | |
354 | return (ret < 0 ? 0 : ret); | |
355 | } | |
356 | EXPORT_SYMBOL_GPL(ip_set_test); | |
357 | ||
358 | int | |
359 | ip_set_add(ip_set_id_t index, const struct sk_buff *skb, | |
360 | u8 family, u8 dim, u8 flags) | |
361 | { | |
362 | struct ip_set *set = ip_set_list[index]; | |
363 | int ret; | |
364 | ||
2f9f28b2 | 365 | BUG_ON(set == NULL); |
a7b4f989 JK |
366 | pr_debug("set %s, index %u\n", set->name, index); |
367 | ||
368 | if (dim < set->type->dimension || | |
369 | !(family == set->family || set->family == AF_UNSPEC)) | |
370 | return 0; | |
371 | ||
372 | write_lock_bh(&set->lock); | |
373 | ret = set->variant->kadt(set, skb, IPSET_ADD, family, dim, flags); | |
374 | write_unlock_bh(&set->lock); | |
375 | ||
376 | return ret; | |
377 | } | |
378 | EXPORT_SYMBOL_GPL(ip_set_add); | |
379 | ||
380 | int | |
381 | ip_set_del(ip_set_id_t index, const struct sk_buff *skb, | |
382 | u8 family, u8 dim, u8 flags) | |
383 | { | |
384 | struct ip_set *set = ip_set_list[index]; | |
385 | int ret = 0; | |
386 | ||
2f9f28b2 | 387 | BUG_ON(set == NULL); |
a7b4f989 JK |
388 | pr_debug("set %s, index %u\n", set->name, index); |
389 | ||
390 | if (dim < set->type->dimension || | |
391 | !(family == set->family || set->family == AF_UNSPEC)) | |
392 | return 0; | |
393 | ||
394 | write_lock_bh(&set->lock); | |
395 | ret = set->variant->kadt(set, skb, IPSET_DEL, family, dim, flags); | |
396 | write_unlock_bh(&set->lock); | |
397 | ||
398 | return ret; | |
399 | } | |
400 | EXPORT_SYMBOL_GPL(ip_set_del); | |
401 | ||
402 | /* | |
403 | * Find set by name, reference it once. The reference makes sure the | |
404 | * thing pointed to, does not go away under our feet. | |
405 | * | |
a7b4f989 JK |
406 | */ |
407 | ip_set_id_t | |
408 | ip_set_get_byname(const char *name, struct ip_set **set) | |
409 | { | |
410 | ip_set_id_t i, index = IPSET_INVALID_ID; | |
411 | struct ip_set *s; | |
412 | ||
413 | for (i = 0; i < ip_set_max; i++) { | |
414 | s = ip_set_list[i]; | |
415 | if (s != NULL && STREQ(s->name, name)) { | |
416 | __ip_set_get(i); | |
417 | index = i; | |
418 | *set = s; | |
419 | } | |
420 | } | |
421 | ||
422 | return index; | |
423 | } | |
424 | EXPORT_SYMBOL_GPL(ip_set_get_byname); | |
425 | ||
426 | /* | |
427 | * If the given set pointer points to a valid set, decrement | |
428 | * reference count by 1. The caller shall not assume the index | |
429 | * to be valid, after calling this function. | |
430 | * | |
a7b4f989 JK |
431 | */ |
432 | void | |
433 | ip_set_put_byindex(ip_set_id_t index) | |
434 | { | |
2f9f28b2 | 435 | if (ip_set_list[index] != NULL) |
a7b4f989 | 436 | __ip_set_put(index); |
a7b4f989 JK |
437 | } |
438 | EXPORT_SYMBOL_GPL(ip_set_put_byindex); | |
439 | ||
440 | /* | |
441 | * Get the name of a set behind a set index. | |
442 | * We assume the set is referenced, so it does exist and | |
443 | * can't be destroyed. The set cannot be renamed due to | |
444 | * the referencing either. | |
445 | * | |
a7b4f989 JK |
446 | */ |
447 | const char * | |
448 | ip_set_name_byindex(ip_set_id_t index) | |
449 | { | |
450 | const struct ip_set *set = ip_set_list[index]; | |
451 | ||
452 | BUG_ON(set == NULL); | |
2f9f28b2 | 453 | BUG_ON(set->ref == 0); |
a7b4f989 JK |
454 | |
455 | /* Referenced, so it's safe */ | |
456 | return set->name; | |
457 | } | |
458 | EXPORT_SYMBOL_GPL(ip_set_name_byindex); | |
459 | ||
460 | /* | |
461 | * Routines to call by external subsystems, which do not | |
462 | * call nfnl_lock for us. | |
463 | */ | |
464 | ||
465 | /* | |
466 | * Find set by name, reference it once. The reference makes sure the | |
467 | * thing pointed to, does not go away under our feet. | |
468 | * | |
469 | * The nfnl mutex is used in the function. | |
470 | */ | |
471 | ip_set_id_t | |
472 | ip_set_nfnl_get(const char *name) | |
473 | { | |
474 | struct ip_set *s; | |
475 | ip_set_id_t index; | |
476 | ||
477 | nfnl_lock(); | |
478 | index = ip_set_get_byname(name, &s); | |
479 | nfnl_unlock(); | |
480 | ||
481 | return index; | |
482 | } | |
483 | EXPORT_SYMBOL_GPL(ip_set_nfnl_get); | |
484 | ||
485 | /* | |
486 | * Find set by index, reference it once. The reference makes sure the | |
487 | * thing pointed to, does not go away under our feet. | |
488 | * | |
489 | * The nfnl mutex is used in the function. | |
490 | */ | |
491 | ip_set_id_t | |
492 | ip_set_nfnl_get_byindex(ip_set_id_t index) | |
493 | { | |
494 | if (index > ip_set_max) | |
495 | return IPSET_INVALID_ID; | |
496 | ||
497 | nfnl_lock(); | |
498 | if (ip_set_list[index]) | |
499 | __ip_set_get(index); | |
500 | else | |
501 | index = IPSET_INVALID_ID; | |
502 | nfnl_unlock(); | |
503 | ||
504 | return index; | |
505 | } | |
506 | EXPORT_SYMBOL_GPL(ip_set_nfnl_get_byindex); | |
507 | ||
508 | /* | |
509 | * If the given set pointer points to a valid set, decrement | |
510 | * reference count by 1. The caller shall not assume the index | |
511 | * to be valid, after calling this function. | |
512 | * | |
513 | * The nfnl mutex is used in the function. | |
514 | */ | |
515 | void | |
516 | ip_set_nfnl_put(ip_set_id_t index) | |
517 | { | |
518 | nfnl_lock(); | |
2f9f28b2 | 519 | ip_set_put_byindex(index); |
a7b4f989 JK |
520 | nfnl_unlock(); |
521 | } | |
522 | EXPORT_SYMBOL_GPL(ip_set_nfnl_put); | |
523 | ||
524 | /* | |
525 | * Communication protocol with userspace over netlink. | |
526 | * | |
2f9f28b2 | 527 | * The commands are serialized by the nfnl mutex. |
a7b4f989 JK |
528 | */ |
529 | ||
530 | static inline bool | |
531 | protocol_failed(const struct nlattr * const tb[]) | |
532 | { | |
533 | return !tb[IPSET_ATTR_PROTOCOL] || | |
534 | nla_get_u8(tb[IPSET_ATTR_PROTOCOL]) != IPSET_PROTOCOL; | |
535 | } | |
536 | ||
537 | static inline u32 | |
538 | flag_exist(const struct nlmsghdr *nlh) | |
539 | { | |
540 | return nlh->nlmsg_flags & NLM_F_EXCL ? 0 : IPSET_FLAG_EXIST; | |
541 | } | |
542 | ||
543 | static struct nlmsghdr * | |
544 | start_msg(struct sk_buff *skb, u32 pid, u32 seq, unsigned int flags, | |
545 | enum ipset_cmd cmd) | |
546 | { | |
547 | struct nlmsghdr *nlh; | |
548 | struct nfgenmsg *nfmsg; | |
549 | ||
550 | nlh = nlmsg_put(skb, pid, seq, cmd | (NFNL_SUBSYS_IPSET << 8), | |
551 | sizeof(*nfmsg), flags); | |
552 | if (nlh == NULL) | |
553 | return NULL; | |
554 | ||
555 | nfmsg = nlmsg_data(nlh); | |
556 | nfmsg->nfgen_family = AF_INET; | |
557 | nfmsg->version = NFNETLINK_V0; | |
558 | nfmsg->res_id = 0; | |
559 | ||
560 | return nlh; | |
561 | } | |
562 | ||
563 | /* Create a set */ | |
564 | ||
565 | static const struct nla_policy ip_set_create_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
566 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
567 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
568 | .len = IPSET_MAXNAMELEN - 1 }, | |
569 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, | |
570 | .len = IPSET_MAXNAMELEN - 1}, | |
571 | [IPSET_ATTR_REVISION] = { .type = NLA_U8 }, | |
572 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, | |
573 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, | |
574 | }; | |
575 | ||
576 | static ip_set_id_t | |
577 | find_set_id(const char *name) | |
578 | { | |
579 | ip_set_id_t i, index = IPSET_INVALID_ID; | |
580 | const struct ip_set *set; | |
581 | ||
582 | for (i = 0; index == IPSET_INVALID_ID && i < ip_set_max; i++) { | |
583 | set = ip_set_list[i]; | |
584 | if (set != NULL && STREQ(set->name, name)) | |
585 | index = i; | |
586 | } | |
587 | return index; | |
588 | } | |
589 | ||
590 | static inline struct ip_set * | |
591 | find_set(const char *name) | |
592 | { | |
593 | ip_set_id_t index = find_set_id(name); | |
594 | ||
595 | return index == IPSET_INVALID_ID ? NULL : ip_set_list[index]; | |
596 | } | |
597 | ||
598 | static int | |
599 | find_free_id(const char *name, ip_set_id_t *index, struct ip_set **set) | |
600 | { | |
601 | ip_set_id_t i; | |
602 | ||
603 | *index = IPSET_INVALID_ID; | |
604 | for (i = 0; i < ip_set_max; i++) { | |
605 | if (ip_set_list[i] == NULL) { | |
606 | if (*index == IPSET_INVALID_ID) | |
607 | *index = i; | |
608 | } else if (STREQ(name, ip_set_list[i]->name)) { | |
609 | /* Name clash */ | |
610 | *set = ip_set_list[i]; | |
611 | return -EEXIST; | |
612 | } | |
613 | } | |
614 | if (*index == IPSET_INVALID_ID) | |
615 | /* No free slot remained */ | |
616 | return -IPSET_ERR_MAX_SETS; | |
617 | return 0; | |
618 | } | |
619 | ||
620 | static int | |
621 | ip_set_create(struct sock *ctnl, struct sk_buff *skb, | |
622 | const struct nlmsghdr *nlh, | |
623 | const struct nlattr * const attr[]) | |
624 | { | |
9846ada1 | 625 | struct ip_set *set, *clash = NULL; |
a7b4f989 JK |
626 | ip_set_id_t index = IPSET_INVALID_ID; |
627 | struct nlattr *tb[IPSET_ATTR_CREATE_MAX+1] = {}; | |
628 | const char *name, *typename; | |
629 | u8 family, revision; | |
630 | u32 flags = flag_exist(nlh); | |
631 | int ret = 0; | |
632 | ||
633 | if (unlikely(protocol_failed(attr) || | |
634 | attr[IPSET_ATTR_SETNAME] == NULL || | |
635 | attr[IPSET_ATTR_TYPENAME] == NULL || | |
636 | attr[IPSET_ATTR_REVISION] == NULL || | |
637 | attr[IPSET_ATTR_FAMILY] == NULL || | |
638 | (attr[IPSET_ATTR_DATA] != NULL && | |
639 | !flag_nested(attr[IPSET_ATTR_DATA])))) | |
640 | return -IPSET_ERR_PROTOCOL; | |
641 | ||
642 | name = nla_data(attr[IPSET_ATTR_SETNAME]); | |
643 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); | |
644 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); | |
645 | revision = nla_get_u8(attr[IPSET_ATTR_REVISION]); | |
646 | pr_debug("setname: %s, typename: %s, family: %s, revision: %u\n", | |
647 | name, typename, family_name(family), revision); | |
648 | ||
649 | /* | |
650 | * First, and without any locks, allocate and initialize | |
651 | * a normal base set structure. | |
652 | */ | |
653 | set = kzalloc(sizeof(struct ip_set), GFP_KERNEL); | |
654 | if (!set) | |
655 | return -ENOMEM; | |
656 | rwlock_init(&set->lock); | |
657 | strlcpy(set->name, name, IPSET_MAXNAMELEN); | |
a7b4f989 JK |
658 | set->family = family; |
659 | ||
660 | /* | |
661 | * Next, check that we know the type, and take | |
662 | * a reference on the type, to make sure it stays available | |
663 | * while constructing our new set. | |
664 | * | |
665 | * After referencing the type, we try to create the type | |
666 | * specific part of the set without holding any locks. | |
667 | */ | |
668 | ret = find_set_type_get(typename, family, revision, &(set->type)); | |
669 | if (ret) | |
670 | goto out; | |
671 | ||
672 | /* | |
673 | * Without holding any locks, create private part. | |
674 | */ | |
675 | if (attr[IPSET_ATTR_DATA] && | |
8da560ce PM |
676 | nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA], |
677 | set->type->create_policy)) { | |
a7b4f989 JK |
678 | ret = -IPSET_ERR_PROTOCOL; |
679 | goto put_out; | |
680 | } | |
681 | ||
682 | ret = set->type->create(set, tb, flags); | |
683 | if (ret != 0) | |
684 | goto put_out; | |
685 | ||
686 | /* BTW, ret==0 here. */ | |
687 | ||
688 | /* | |
689 | * Here, we have a valid, constructed set and we are protected | |
2f9f28b2 JK |
690 | * by the nfnl mutex. Find the first free index in ip_set_list |
691 | * and check clashing. | |
a7b4f989 JK |
692 | */ |
693 | if ((ret = find_free_id(set->name, &index, &clash)) != 0) { | |
694 | /* If this is the same set and requested, ignore error */ | |
695 | if (ret == -EEXIST && | |
696 | (flags & IPSET_FLAG_EXIST) && | |
697 | STREQ(set->type->name, clash->type->name) && | |
698 | set->type->family == clash->type->family && | |
699 | set->type->revision == clash->type->revision && | |
700 | set->variant->same_set(set, clash)) | |
701 | ret = 0; | |
702 | goto cleanup; | |
703 | } | |
704 | ||
705 | /* | |
706 | * Finally! Add our shiny new set to the list, and be done. | |
707 | */ | |
708 | pr_debug("create: '%s' created with index %u!\n", set->name, index); | |
709 | ip_set_list[index] = set; | |
710 | ||
711 | return ret; | |
712 | ||
713 | cleanup: | |
714 | set->variant->destroy(set); | |
715 | put_out: | |
716 | module_put(set->type->me); | |
717 | out: | |
718 | kfree(set); | |
719 | return ret; | |
720 | } | |
721 | ||
722 | /* Destroy sets */ | |
723 | ||
724 | static const struct nla_policy | |
725 | ip_set_setname_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
726 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
727 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
728 | .len = IPSET_MAXNAMELEN - 1 }, | |
729 | }; | |
730 | ||
731 | static void | |
732 | ip_set_destroy_set(ip_set_id_t index) | |
733 | { | |
734 | struct ip_set *set = ip_set_list[index]; | |
735 | ||
736 | pr_debug("set: %s\n", set->name); | |
737 | ip_set_list[index] = NULL; | |
738 | ||
739 | /* Must call it without holding any lock */ | |
740 | set->variant->destroy(set); | |
741 | module_put(set->type->me); | |
742 | kfree(set); | |
743 | } | |
744 | ||
745 | static int | |
746 | ip_set_destroy(struct sock *ctnl, struct sk_buff *skb, | |
747 | const struct nlmsghdr *nlh, | |
748 | const struct nlattr * const attr[]) | |
749 | { | |
750 | ip_set_id_t i; | |
2f9f28b2 | 751 | int ret = 0; |
a7b4f989 JK |
752 | |
753 | if (unlikely(protocol_failed(attr))) | |
754 | return -IPSET_ERR_PROTOCOL; | |
755 | ||
2f9f28b2 JK |
756 | /* Commands are serialized and references are |
757 | * protected by the ip_set_ref_lock. | |
758 | * External systems (i.e. xt_set) must call | |
759 | * ip_set_put|get_nfnl_* functions, that way we | |
760 | * can safely check references here. | |
761 | * | |
762 | * list:set timer can only decrement the reference | |
763 | * counter, so if it's already zero, we can proceed | |
764 | * without holding the lock. | |
765 | */ | |
766 | read_lock_bh(&ip_set_ref_lock); | |
a7b4f989 JK |
767 | if (!attr[IPSET_ATTR_SETNAME]) { |
768 | for (i = 0; i < ip_set_max; i++) { | |
2f9f28b2 JK |
769 | if (ip_set_list[i] != NULL && ip_set_list[i]->ref) { |
770 | ret = IPSET_ERR_BUSY; | |
771 | goto out; | |
772 | } | |
a7b4f989 | 773 | } |
2f9f28b2 | 774 | read_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
775 | for (i = 0; i < ip_set_max; i++) { |
776 | if (ip_set_list[i] != NULL) | |
777 | ip_set_destroy_set(i); | |
778 | } | |
779 | } else { | |
780 | i = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME])); | |
2f9f28b2 JK |
781 | if (i == IPSET_INVALID_ID) { |
782 | ret = -ENOENT; | |
783 | goto out; | |
784 | } else if (ip_set_list[i]->ref) { | |
785 | ret = -IPSET_ERR_BUSY; | |
786 | goto out; | |
787 | } | |
788 | read_unlock_bh(&ip_set_ref_lock); | |
a7b4f989 JK |
789 | |
790 | ip_set_destroy_set(i); | |
791 | } | |
792 | return 0; | |
2f9f28b2 JK |
793 | out: |
794 | read_unlock_bh(&ip_set_ref_lock); | |
795 | return ret; | |
a7b4f989 JK |
796 | } |
797 | ||
798 | /* Flush sets */ | |
799 | ||
800 | static void | |
801 | ip_set_flush_set(struct ip_set *set) | |
802 | { | |
803 | pr_debug("set: %s\n", set->name); | |
804 | ||
805 | write_lock_bh(&set->lock); | |
806 | set->variant->flush(set); | |
807 | write_unlock_bh(&set->lock); | |
808 | } | |
809 | ||
810 | static int | |
811 | ip_set_flush(struct sock *ctnl, struct sk_buff *skb, | |
812 | const struct nlmsghdr *nlh, | |
813 | const struct nlattr * const attr[]) | |
814 | { | |
815 | ip_set_id_t i; | |
816 | ||
817 | if (unlikely(protocol_failed(attr))) | |
9184a9cb | 818 | return -IPSET_ERR_PROTOCOL; |
a7b4f989 JK |
819 | |
820 | if (!attr[IPSET_ATTR_SETNAME]) { | |
821 | for (i = 0; i < ip_set_max; i++) | |
822 | if (ip_set_list[i] != NULL) | |
823 | ip_set_flush_set(ip_set_list[i]); | |
824 | } else { | |
825 | i = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME])); | |
826 | if (i == IPSET_INVALID_ID) | |
827 | return -ENOENT; | |
828 | ||
829 | ip_set_flush_set(ip_set_list[i]); | |
830 | } | |
831 | ||
832 | return 0; | |
833 | } | |
834 | ||
835 | /* Rename a set */ | |
836 | ||
837 | static const struct nla_policy | |
838 | ip_set_setname2_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
839 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
840 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
841 | .len = IPSET_MAXNAMELEN - 1 }, | |
842 | [IPSET_ATTR_SETNAME2] = { .type = NLA_NUL_STRING, | |
843 | .len = IPSET_MAXNAMELEN - 1 }, | |
844 | }; | |
845 | ||
846 | static int | |
847 | ip_set_rename(struct sock *ctnl, struct sk_buff *skb, | |
848 | const struct nlmsghdr *nlh, | |
849 | const struct nlattr * const attr[]) | |
850 | { | |
851 | struct ip_set *set; | |
852 | const char *name2; | |
853 | ip_set_id_t i; | |
2f9f28b2 | 854 | int ret = 0; |
a7b4f989 JK |
855 | |
856 | if (unlikely(protocol_failed(attr) || | |
857 | attr[IPSET_ATTR_SETNAME] == NULL || | |
858 | attr[IPSET_ATTR_SETNAME2] == NULL)) | |
859 | return -IPSET_ERR_PROTOCOL; | |
860 | ||
861 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); | |
862 | if (set == NULL) | |
863 | return -ENOENT; | |
2f9f28b2 JK |
864 | |
865 | read_lock_bh(&ip_set_ref_lock); | |
866 | if (set->ref != 0) { | |
867 | ret = -IPSET_ERR_REFERENCED; | |
868 | goto out; | |
869 | } | |
a7b4f989 JK |
870 | |
871 | name2 = nla_data(attr[IPSET_ATTR_SETNAME2]); | |
872 | for (i = 0; i < ip_set_max; i++) { | |
873 | if (ip_set_list[i] != NULL && | |
2f9f28b2 JK |
874 | STREQ(ip_set_list[i]->name, name2)) { |
875 | ret = -IPSET_ERR_EXIST_SETNAME2; | |
876 | goto out; | |
877 | } | |
a7b4f989 JK |
878 | } |
879 | strncpy(set->name, name2, IPSET_MAXNAMELEN); | |
880 | ||
2f9f28b2 JK |
881 | out: |
882 | read_unlock_bh(&ip_set_ref_lock); | |
883 | return ret; | |
a7b4f989 JK |
884 | } |
885 | ||
886 | /* Swap two sets so that name/index points to the other. | |
887 | * References and set names are also swapped. | |
888 | * | |
2f9f28b2 JK |
889 | * The commands are serialized by the nfnl mutex and references are |
890 | * protected by the ip_set_ref_lock. The kernel interfaces | |
a7b4f989 JK |
891 | * do not hold the mutex but the pointer settings are atomic |
892 | * so the ip_set_list always contains valid pointers to the sets. | |
893 | */ | |
894 | ||
895 | static int | |
896 | ip_set_swap(struct sock *ctnl, struct sk_buff *skb, | |
897 | const struct nlmsghdr *nlh, | |
898 | const struct nlattr * const attr[]) | |
899 | { | |
900 | struct ip_set *from, *to; | |
901 | ip_set_id_t from_id, to_id; | |
902 | char from_name[IPSET_MAXNAMELEN]; | |
a7b4f989 JK |
903 | |
904 | if (unlikely(protocol_failed(attr) || | |
905 | attr[IPSET_ATTR_SETNAME] == NULL || | |
906 | attr[IPSET_ATTR_SETNAME2] == NULL)) | |
907 | return -IPSET_ERR_PROTOCOL; | |
908 | ||
909 | from_id = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME])); | |
910 | if (from_id == IPSET_INVALID_ID) | |
911 | return -ENOENT; | |
912 | ||
913 | to_id = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME2])); | |
914 | if (to_id == IPSET_INVALID_ID) | |
915 | return -IPSET_ERR_EXIST_SETNAME2; | |
916 | ||
917 | from = ip_set_list[from_id]; | |
918 | to = ip_set_list[to_id]; | |
919 | ||
920 | /* Features must not change. | |
25985edc | 921 | * Not an artificial restriction anymore, as we must prevent |
a7b4f989 JK |
922 | * possible loops created by swapping in setlist type of sets. */ |
923 | if (!(from->type->features == to->type->features && | |
924 | from->type->family == to->type->family)) | |
925 | return -IPSET_ERR_TYPE_MISMATCH; | |
926 | ||
a7b4f989 | 927 | strncpy(from_name, from->name, IPSET_MAXNAMELEN); |
a7b4f989 | 928 | strncpy(from->name, to->name, IPSET_MAXNAMELEN); |
a7b4f989 | 929 | strncpy(to->name, from_name, IPSET_MAXNAMELEN); |
a7b4f989 | 930 | |
2f9f28b2 JK |
931 | write_lock_bh(&ip_set_ref_lock); |
932 | swap(from->ref, to->ref); | |
a7b4f989 JK |
933 | ip_set_list[from_id] = to; |
934 | ip_set_list[to_id] = from; | |
2f9f28b2 | 935 | write_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
936 | |
937 | return 0; | |
938 | } | |
939 | ||
940 | /* List/save set data */ | |
941 | ||
942 | #define DUMP_INIT 0L | |
943 | #define DUMP_ALL 1L | |
944 | #define DUMP_ONE 2L | |
945 | #define DUMP_LAST 3L | |
946 | ||
947 | static int | |
948 | ip_set_dump_done(struct netlink_callback *cb) | |
949 | { | |
950 | if (cb->args[2]) { | |
951 | pr_debug("release set %s\n", ip_set_list[cb->args[1]]->name); | |
2f9f28b2 | 952 | ip_set_put_byindex((ip_set_id_t) cb->args[1]); |
a7b4f989 JK |
953 | } |
954 | return 0; | |
955 | } | |
956 | ||
957 | static inline void | |
958 | dump_attrs(struct nlmsghdr *nlh) | |
959 | { | |
960 | const struct nlattr *attr; | |
961 | int rem; | |
962 | ||
963 | pr_debug("dump nlmsg\n"); | |
964 | nlmsg_for_each_attr(attr, nlh, sizeof(struct nfgenmsg), rem) { | |
965 | pr_debug("type: %u, len %u\n", nla_type(attr), attr->nla_len); | |
966 | } | |
967 | } | |
968 | ||
969 | static int | |
970 | dump_init(struct netlink_callback *cb) | |
971 | { | |
972 | struct nlmsghdr *nlh = nlmsg_hdr(cb->skb); | |
973 | int min_len = NLMSG_SPACE(sizeof(struct nfgenmsg)); | |
974 | struct nlattr *cda[IPSET_ATTR_CMD_MAX+1]; | |
975 | struct nlattr *attr = (void *)nlh + min_len; | |
976 | ip_set_id_t index; | |
977 | ||
978 | /* Second pass, so parser can't fail */ | |
979 | nla_parse(cda, IPSET_ATTR_CMD_MAX, | |
980 | attr, nlh->nlmsg_len - min_len, ip_set_setname_policy); | |
981 | ||
982 | /* cb->args[0] : dump single set/all sets | |
983 | * [1] : set index | |
984 | * [..]: type specific | |
985 | */ | |
986 | ||
987 | if (!cda[IPSET_ATTR_SETNAME]) { | |
988 | cb->args[0] = DUMP_ALL; | |
989 | return 0; | |
990 | } | |
991 | ||
992 | index = find_set_id(nla_data(cda[IPSET_ATTR_SETNAME])); | |
993 | if (index == IPSET_INVALID_ID) | |
994 | return -ENOENT; | |
995 | ||
996 | cb->args[0] = DUMP_ONE; | |
997 | cb->args[1] = index; | |
998 | return 0; | |
999 | } | |
1000 | ||
1001 | static int | |
1002 | ip_set_dump_start(struct sk_buff *skb, struct netlink_callback *cb) | |
1003 | { | |
1004 | ip_set_id_t index = IPSET_INVALID_ID, max; | |
1005 | struct ip_set *set = NULL; | |
1006 | struct nlmsghdr *nlh = NULL; | |
1007 | unsigned int flags = NETLINK_CB(cb->skb).pid ? NLM_F_MULTI : 0; | |
1008 | int ret = 0; | |
1009 | ||
1010 | if (cb->args[0] == DUMP_INIT) { | |
1011 | ret = dump_init(cb); | |
1012 | if (ret < 0) { | |
1013 | nlh = nlmsg_hdr(cb->skb); | |
1014 | /* We have to create and send the error message | |
1015 | * manually :-( */ | |
1016 | if (nlh->nlmsg_flags & NLM_F_ACK) | |
1017 | netlink_ack(cb->skb, nlh, ret); | |
1018 | return ret; | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | if (cb->args[1] >= ip_set_max) | |
1023 | goto out; | |
1024 | ||
a7b4f989 | 1025 | max = cb->args[0] == DUMP_ONE ? cb->args[1] + 1 : ip_set_max; |
a8a8a093 JK |
1026 | dump_last: |
1027 | pr_debug("args[0]: %ld args[1]: %ld\n", cb->args[0], cb->args[1]); | |
a7b4f989 JK |
1028 | for (; cb->args[1] < max; cb->args[1]++) { |
1029 | index = (ip_set_id_t) cb->args[1]; | |
1030 | set = ip_set_list[index]; | |
1031 | if (set == NULL) { | |
1032 | if (cb->args[0] == DUMP_ONE) { | |
1033 | ret = -ENOENT; | |
1034 | goto out; | |
1035 | } | |
1036 | continue; | |
1037 | } | |
1038 | /* When dumping all sets, we must dump "sorted" | |
1039 | * so that lists (unions of sets) are dumped last. | |
1040 | */ | |
1041 | if (cb->args[0] != DUMP_ONE && | |
a8a8a093 JK |
1042 | ((cb->args[0] == DUMP_ALL) == |
1043 | !!(set->type->features & IPSET_DUMP_LAST))) | |
a7b4f989 JK |
1044 | continue; |
1045 | pr_debug("List set: %s\n", set->name); | |
1046 | if (!cb->args[2]) { | |
1047 | /* Start listing: make sure set won't be destroyed */ | |
1048 | pr_debug("reference set\n"); | |
1049 | __ip_set_get(index); | |
1050 | } | |
1051 | nlh = start_msg(skb, NETLINK_CB(cb->skb).pid, | |
1052 | cb->nlh->nlmsg_seq, flags, | |
1053 | IPSET_CMD_LIST); | |
1054 | if (!nlh) { | |
1055 | ret = -EMSGSIZE; | |
1056 | goto release_refcount; | |
1057 | } | |
1058 | NLA_PUT_U8(skb, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL); | |
1059 | NLA_PUT_STRING(skb, IPSET_ATTR_SETNAME, set->name); | |
1060 | switch (cb->args[2]) { | |
1061 | case 0: | |
1062 | /* Core header data */ | |
1063 | NLA_PUT_STRING(skb, IPSET_ATTR_TYPENAME, | |
1064 | set->type->name); | |
1065 | NLA_PUT_U8(skb, IPSET_ATTR_FAMILY, | |
1066 | set->family); | |
1067 | NLA_PUT_U8(skb, IPSET_ATTR_REVISION, | |
1068 | set->type->revision); | |
1069 | ret = set->variant->head(set, skb); | |
1070 | if (ret < 0) | |
1071 | goto release_refcount; | |
1072 | /* Fall through and add elements */ | |
1073 | default: | |
1074 | read_lock_bh(&set->lock); | |
1075 | ret = set->variant->list(set, skb, cb); | |
1076 | read_unlock_bh(&set->lock); | |
1077 | if (!cb->args[2]) { | |
1078 | /* Set is done, proceed with next one */ | |
1079 | if (cb->args[0] == DUMP_ONE) | |
1080 | cb->args[1] = IPSET_INVALID_ID; | |
1081 | else | |
1082 | cb->args[1]++; | |
1083 | } | |
1084 | goto release_refcount; | |
1085 | } | |
1086 | } | |
a8a8a093 JK |
1087 | /* If we dump all sets, continue with dumping last ones */ |
1088 | if (cb->args[0] == DUMP_ALL) { | |
1089 | cb->args[0] = DUMP_LAST; | |
1090 | cb->args[1] = 0; | |
1091 | goto dump_last; | |
1092 | } | |
a7b4f989 JK |
1093 | goto out; |
1094 | ||
1095 | nla_put_failure: | |
1096 | ret = -EFAULT; | |
1097 | release_refcount: | |
1098 | /* If there was an error or set is done, release set */ | |
1099 | if (ret || !cb->args[2]) { | |
1100 | pr_debug("release set %s\n", ip_set_list[index]->name); | |
2f9f28b2 | 1101 | ip_set_put_byindex(index); |
a7b4f989 | 1102 | } |
a7b4f989 JK |
1103 | out: |
1104 | if (nlh) { | |
1105 | nlmsg_end(skb, nlh); | |
1106 | pr_debug("nlmsg_len: %u\n", nlh->nlmsg_len); | |
1107 | dump_attrs(nlh); | |
1108 | } | |
1109 | ||
1110 | return ret < 0 ? ret : skb->len; | |
1111 | } | |
1112 | ||
1113 | static int | |
1114 | ip_set_dump(struct sock *ctnl, struct sk_buff *skb, | |
1115 | const struct nlmsghdr *nlh, | |
1116 | const struct nlattr * const attr[]) | |
1117 | { | |
1118 | if (unlikely(protocol_failed(attr))) | |
1119 | return -IPSET_ERR_PROTOCOL; | |
1120 | ||
1121 | return netlink_dump_start(ctnl, skb, nlh, | |
1122 | ip_set_dump_start, | |
c7ac8679 | 1123 | ip_set_dump_done, 0); |
a7b4f989 JK |
1124 | } |
1125 | ||
1126 | /* Add, del and test */ | |
1127 | ||
1128 | static const struct nla_policy ip_set_adt_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1129 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1130 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
1131 | .len = IPSET_MAXNAMELEN - 1 }, | |
1132 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, | |
1133 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, | |
1134 | [IPSET_ATTR_ADT] = { .type = NLA_NESTED }, | |
1135 | }; | |
1136 | ||
1137 | static int | |
5f52bc3c | 1138 | call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set, |
a7b4f989 JK |
1139 | struct nlattr *tb[], enum ipset_adt adt, |
1140 | u32 flags, bool use_lineno) | |
1141 | { | |
1142 | int ret, retried = 0; | |
1143 | u32 lineno = 0; | |
1144 | bool eexist = flags & IPSET_FLAG_EXIST; | |
1145 | ||
1146 | do { | |
1147 | write_lock_bh(&set->lock); | |
1148 | ret = set->variant->uadt(set, tb, adt, &lineno, flags); | |
1149 | write_unlock_bh(&set->lock); | |
1150 | } while (ret == -EAGAIN && | |
1151 | set->variant->resize && | |
1152 | (ret = set->variant->resize(set, retried++)) == 0); | |
1153 | ||
1154 | if (!ret || (ret == -IPSET_ERR_EXIST && eexist)) | |
1155 | return 0; | |
1156 | if (lineno && use_lineno) { | |
1157 | /* Error in restore/batch mode: send back lineno */ | |
5f52bc3c JK |
1158 | struct nlmsghdr *rep, *nlh = nlmsg_hdr(skb); |
1159 | struct sk_buff *skb2; | |
1160 | struct nlmsgerr *errmsg; | |
1161 | size_t payload = sizeof(*errmsg) + nlmsg_len(nlh); | |
a7b4f989 JK |
1162 | int min_len = NLMSG_SPACE(sizeof(struct nfgenmsg)); |
1163 | struct nlattr *cda[IPSET_ATTR_CMD_MAX+1]; | |
5f52bc3c | 1164 | struct nlattr *cmdattr; |
a7b4f989 JK |
1165 | u32 *errline; |
1166 | ||
5f52bc3c JK |
1167 | skb2 = nlmsg_new(payload, GFP_KERNEL); |
1168 | if (skb2 == NULL) | |
1169 | return -ENOMEM; | |
1170 | rep = __nlmsg_put(skb2, NETLINK_CB(skb).pid, | |
1171 | nlh->nlmsg_seq, NLMSG_ERROR, payload, 0); | |
1172 | errmsg = nlmsg_data(rep); | |
1173 | errmsg->error = ret; | |
1174 | memcpy(&errmsg->msg, nlh, nlh->nlmsg_len); | |
1175 | cmdattr = (void *)&errmsg->msg + min_len; | |
1176 | ||
a7b4f989 JK |
1177 | nla_parse(cda, IPSET_ATTR_CMD_MAX, |
1178 | cmdattr, nlh->nlmsg_len - min_len, | |
1179 | ip_set_adt_policy); | |
1180 | ||
1181 | errline = nla_data(cda[IPSET_ATTR_LINENO]); | |
1182 | ||
1183 | *errline = lineno; | |
5f52bc3c JK |
1184 | |
1185 | netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
1186 | /* Signal netlink not to send its ACK/errmsg. */ | |
1187 | return -EINTR; | |
a7b4f989 JK |
1188 | } |
1189 | ||
1190 | return ret; | |
1191 | } | |
1192 | ||
1193 | static int | |
1194 | ip_set_uadd(struct sock *ctnl, struct sk_buff *skb, | |
1195 | const struct nlmsghdr *nlh, | |
1196 | const struct nlattr * const attr[]) | |
1197 | { | |
1198 | struct ip_set *set; | |
1199 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; | |
1200 | const struct nlattr *nla; | |
1201 | u32 flags = flag_exist(nlh); | |
1202 | bool use_lineno; | |
1203 | int ret = 0; | |
1204 | ||
1205 | if (unlikely(protocol_failed(attr) || | |
1206 | attr[IPSET_ATTR_SETNAME] == NULL || | |
1207 | !((attr[IPSET_ATTR_DATA] != NULL) ^ | |
1208 | (attr[IPSET_ATTR_ADT] != NULL)) || | |
1209 | (attr[IPSET_ATTR_DATA] != NULL && | |
1210 | !flag_nested(attr[IPSET_ATTR_DATA])) || | |
1211 | (attr[IPSET_ATTR_ADT] != NULL && | |
1212 | (!flag_nested(attr[IPSET_ATTR_ADT]) || | |
1213 | attr[IPSET_ATTR_LINENO] == NULL)))) | |
1214 | return -IPSET_ERR_PROTOCOL; | |
1215 | ||
1216 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); | |
1217 | if (set == NULL) | |
1218 | return -ENOENT; | |
1219 | ||
1220 | use_lineno = !!attr[IPSET_ATTR_LINENO]; | |
1221 | if (attr[IPSET_ATTR_DATA]) { | |
8da560ce PM |
1222 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
1223 | attr[IPSET_ATTR_DATA], | |
1224 | set->type->adt_policy)) | |
a7b4f989 | 1225 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c JK |
1226 | ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, flags, |
1227 | use_lineno); | |
a7b4f989 JK |
1228 | } else { |
1229 | int nla_rem; | |
1230 | ||
1231 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { | |
1232 | memset(tb, 0, sizeof(tb)); | |
1233 | if (nla_type(nla) != IPSET_ATTR_DATA || | |
1234 | !flag_nested(nla) || | |
8da560ce PM |
1235 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
1236 | set->type->adt_policy)) | |
a7b4f989 | 1237 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c | 1238 | ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, |
a7b4f989 JK |
1239 | flags, use_lineno); |
1240 | if (ret < 0) | |
1241 | return ret; | |
1242 | } | |
1243 | } | |
1244 | return ret; | |
1245 | } | |
1246 | ||
1247 | static int | |
1248 | ip_set_udel(struct sock *ctnl, struct sk_buff *skb, | |
1249 | const struct nlmsghdr *nlh, | |
1250 | const struct nlattr * const attr[]) | |
1251 | { | |
1252 | struct ip_set *set; | |
1253 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; | |
1254 | const struct nlattr *nla; | |
1255 | u32 flags = flag_exist(nlh); | |
1256 | bool use_lineno; | |
1257 | int ret = 0; | |
1258 | ||
1259 | if (unlikely(protocol_failed(attr) || | |
1260 | attr[IPSET_ATTR_SETNAME] == NULL || | |
1261 | !((attr[IPSET_ATTR_DATA] != NULL) ^ | |
1262 | (attr[IPSET_ATTR_ADT] != NULL)) || | |
1263 | (attr[IPSET_ATTR_DATA] != NULL && | |
1264 | !flag_nested(attr[IPSET_ATTR_DATA])) || | |
1265 | (attr[IPSET_ATTR_ADT] != NULL && | |
1266 | (!flag_nested(attr[IPSET_ATTR_ADT]) || | |
1267 | attr[IPSET_ATTR_LINENO] == NULL)))) | |
1268 | return -IPSET_ERR_PROTOCOL; | |
1269 | ||
1270 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); | |
1271 | if (set == NULL) | |
1272 | return -ENOENT; | |
1273 | ||
1274 | use_lineno = !!attr[IPSET_ATTR_LINENO]; | |
1275 | if (attr[IPSET_ATTR_DATA]) { | |
8da560ce PM |
1276 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
1277 | attr[IPSET_ATTR_DATA], | |
1278 | set->type->adt_policy)) | |
a7b4f989 | 1279 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c JK |
1280 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, flags, |
1281 | use_lineno); | |
a7b4f989 JK |
1282 | } else { |
1283 | int nla_rem; | |
1284 | ||
1285 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { | |
1286 | memset(tb, 0, sizeof(*tb)); | |
1287 | if (nla_type(nla) != IPSET_ATTR_DATA || | |
1288 | !flag_nested(nla) || | |
8da560ce PM |
1289 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
1290 | set->type->adt_policy)) | |
a7b4f989 | 1291 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c | 1292 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, |
a7b4f989 JK |
1293 | flags, use_lineno); |
1294 | if (ret < 0) | |
1295 | return ret; | |
1296 | } | |
1297 | } | |
1298 | return ret; | |
1299 | } | |
1300 | ||
1301 | static int | |
1302 | ip_set_utest(struct sock *ctnl, struct sk_buff *skb, | |
1303 | const struct nlmsghdr *nlh, | |
1304 | const struct nlattr * const attr[]) | |
1305 | { | |
1306 | struct ip_set *set; | |
1307 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; | |
1308 | int ret = 0; | |
1309 | ||
1310 | if (unlikely(protocol_failed(attr) || | |
1311 | attr[IPSET_ATTR_SETNAME] == NULL || | |
1312 | attr[IPSET_ATTR_DATA] == NULL || | |
1313 | !flag_nested(attr[IPSET_ATTR_DATA]))) | |
1314 | return -IPSET_ERR_PROTOCOL; | |
1315 | ||
1316 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); | |
1317 | if (set == NULL) | |
1318 | return -ENOENT; | |
1319 | ||
8da560ce PM |
1320 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA], |
1321 | set->type->adt_policy)) | |
a7b4f989 JK |
1322 | return -IPSET_ERR_PROTOCOL; |
1323 | ||
1324 | read_lock_bh(&set->lock); | |
1325 | ret = set->variant->uadt(set, tb, IPSET_TEST, NULL, 0); | |
1326 | read_unlock_bh(&set->lock); | |
1327 | /* Userspace can't trigger element to be re-added */ | |
1328 | if (ret == -EAGAIN) | |
1329 | ret = 1; | |
1330 | ||
1331 | return ret < 0 ? ret : ret > 0 ? 0 : -IPSET_ERR_EXIST; | |
1332 | } | |
1333 | ||
1334 | /* Get headed data of a set */ | |
1335 | ||
1336 | static int | |
1337 | ip_set_header(struct sock *ctnl, struct sk_buff *skb, | |
1338 | const struct nlmsghdr *nlh, | |
1339 | const struct nlattr * const attr[]) | |
1340 | { | |
1341 | const struct ip_set *set; | |
1342 | struct sk_buff *skb2; | |
1343 | struct nlmsghdr *nlh2; | |
1344 | ip_set_id_t index; | |
1345 | int ret = 0; | |
1346 | ||
1347 | if (unlikely(protocol_failed(attr) || | |
1348 | attr[IPSET_ATTR_SETNAME] == NULL)) | |
1349 | return -IPSET_ERR_PROTOCOL; | |
1350 | ||
1351 | index = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME])); | |
1352 | if (index == IPSET_INVALID_ID) | |
1353 | return -ENOENT; | |
1354 | set = ip_set_list[index]; | |
1355 | ||
1356 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1357 | if (skb2 == NULL) | |
1358 | return -ENOMEM; | |
1359 | ||
1360 | nlh2 = start_msg(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, | |
1361 | IPSET_CMD_HEADER); | |
1362 | if (!nlh2) | |
1363 | goto nlmsg_failure; | |
1364 | NLA_PUT_U8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL); | |
1365 | NLA_PUT_STRING(skb2, IPSET_ATTR_SETNAME, set->name); | |
1366 | NLA_PUT_STRING(skb2, IPSET_ATTR_TYPENAME, set->type->name); | |
1367 | NLA_PUT_U8(skb2, IPSET_ATTR_FAMILY, set->family); | |
1368 | NLA_PUT_U8(skb2, IPSET_ATTR_REVISION, set->type->revision); | |
1369 | nlmsg_end(skb2, nlh2); | |
1370 | ||
1371 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
1372 | if (ret < 0) | |
1373 | return ret; | |
1374 | ||
1375 | return 0; | |
1376 | ||
1377 | nla_put_failure: | |
1378 | nlmsg_cancel(skb2, nlh2); | |
1379 | nlmsg_failure: | |
1380 | kfree_skb(skb2); | |
1381 | return -EMSGSIZE; | |
1382 | } | |
1383 | ||
1384 | /* Get type data */ | |
1385 | ||
1386 | static const struct nla_policy ip_set_type_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1387 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1388 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, | |
1389 | .len = IPSET_MAXNAMELEN - 1 }, | |
1390 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, | |
1391 | }; | |
1392 | ||
1393 | static int | |
1394 | ip_set_type(struct sock *ctnl, struct sk_buff *skb, | |
1395 | const struct nlmsghdr *nlh, | |
1396 | const struct nlattr * const attr[]) | |
1397 | { | |
1398 | struct sk_buff *skb2; | |
1399 | struct nlmsghdr *nlh2; | |
1400 | u8 family, min, max; | |
1401 | const char *typename; | |
1402 | int ret = 0; | |
1403 | ||
1404 | if (unlikely(protocol_failed(attr) || | |
1405 | attr[IPSET_ATTR_TYPENAME] == NULL || | |
1406 | attr[IPSET_ATTR_FAMILY] == NULL)) | |
1407 | return -IPSET_ERR_PROTOCOL; | |
1408 | ||
1409 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); | |
1410 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); | |
1411 | ret = find_set_type_minmax(typename, family, &min, &max); | |
1412 | if (ret) | |
1413 | return ret; | |
1414 | ||
1415 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1416 | if (skb2 == NULL) | |
1417 | return -ENOMEM; | |
1418 | ||
1419 | nlh2 = start_msg(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, | |
1420 | IPSET_CMD_TYPE); | |
1421 | if (!nlh2) | |
1422 | goto nlmsg_failure; | |
1423 | NLA_PUT_U8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL); | |
1424 | NLA_PUT_STRING(skb2, IPSET_ATTR_TYPENAME, typename); | |
1425 | NLA_PUT_U8(skb2, IPSET_ATTR_FAMILY, family); | |
1426 | NLA_PUT_U8(skb2, IPSET_ATTR_REVISION, max); | |
1427 | NLA_PUT_U8(skb2, IPSET_ATTR_REVISION_MIN, min); | |
1428 | nlmsg_end(skb2, nlh2); | |
1429 | ||
1430 | pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len); | |
1431 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
1432 | if (ret < 0) | |
1433 | return ret; | |
1434 | ||
1435 | return 0; | |
1436 | ||
1437 | nla_put_failure: | |
1438 | nlmsg_cancel(skb2, nlh2); | |
1439 | nlmsg_failure: | |
1440 | kfree_skb(skb2); | |
1441 | return -EMSGSIZE; | |
1442 | } | |
1443 | ||
1444 | /* Get protocol version */ | |
1445 | ||
1446 | static const struct nla_policy | |
1447 | ip_set_protocol_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1448 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1449 | }; | |
1450 | ||
1451 | static int | |
1452 | ip_set_protocol(struct sock *ctnl, struct sk_buff *skb, | |
1453 | const struct nlmsghdr *nlh, | |
1454 | const struct nlattr * const attr[]) | |
1455 | { | |
1456 | struct sk_buff *skb2; | |
1457 | struct nlmsghdr *nlh2; | |
1458 | int ret = 0; | |
1459 | ||
1460 | if (unlikely(attr[IPSET_ATTR_PROTOCOL] == NULL)) | |
1461 | return -IPSET_ERR_PROTOCOL; | |
1462 | ||
1463 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1464 | if (skb2 == NULL) | |
1465 | return -ENOMEM; | |
1466 | ||
1467 | nlh2 = start_msg(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, | |
1468 | IPSET_CMD_PROTOCOL); | |
1469 | if (!nlh2) | |
1470 | goto nlmsg_failure; | |
1471 | NLA_PUT_U8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL); | |
1472 | nlmsg_end(skb2, nlh2); | |
1473 | ||
1474 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
1475 | if (ret < 0) | |
1476 | return ret; | |
1477 | ||
1478 | return 0; | |
1479 | ||
1480 | nla_put_failure: | |
1481 | nlmsg_cancel(skb2, nlh2); | |
1482 | nlmsg_failure: | |
1483 | kfree_skb(skb2); | |
1484 | return -EMSGSIZE; | |
1485 | } | |
1486 | ||
1487 | static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = { | |
1488 | [IPSET_CMD_CREATE] = { | |
1489 | .call = ip_set_create, | |
1490 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1491 | .policy = ip_set_create_policy, | |
1492 | }, | |
1493 | [IPSET_CMD_DESTROY] = { | |
1494 | .call = ip_set_destroy, | |
1495 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1496 | .policy = ip_set_setname_policy, | |
1497 | }, | |
1498 | [IPSET_CMD_FLUSH] = { | |
1499 | .call = ip_set_flush, | |
1500 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1501 | .policy = ip_set_setname_policy, | |
1502 | }, | |
1503 | [IPSET_CMD_RENAME] = { | |
1504 | .call = ip_set_rename, | |
1505 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1506 | .policy = ip_set_setname2_policy, | |
1507 | }, | |
1508 | [IPSET_CMD_SWAP] = { | |
1509 | .call = ip_set_swap, | |
1510 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1511 | .policy = ip_set_setname2_policy, | |
1512 | }, | |
1513 | [IPSET_CMD_LIST] = { | |
1514 | .call = ip_set_dump, | |
1515 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1516 | .policy = ip_set_setname_policy, | |
1517 | }, | |
1518 | [IPSET_CMD_SAVE] = { | |
1519 | .call = ip_set_dump, | |
1520 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1521 | .policy = ip_set_setname_policy, | |
1522 | }, | |
1523 | [IPSET_CMD_ADD] = { | |
1524 | .call = ip_set_uadd, | |
1525 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1526 | .policy = ip_set_adt_policy, | |
1527 | }, | |
1528 | [IPSET_CMD_DEL] = { | |
1529 | .call = ip_set_udel, | |
1530 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1531 | .policy = ip_set_adt_policy, | |
1532 | }, | |
1533 | [IPSET_CMD_TEST] = { | |
1534 | .call = ip_set_utest, | |
1535 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1536 | .policy = ip_set_adt_policy, | |
1537 | }, | |
1538 | [IPSET_CMD_HEADER] = { | |
1539 | .call = ip_set_header, | |
1540 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1541 | .policy = ip_set_setname_policy, | |
1542 | }, | |
1543 | [IPSET_CMD_TYPE] = { | |
1544 | .call = ip_set_type, | |
1545 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1546 | .policy = ip_set_type_policy, | |
1547 | }, | |
1548 | [IPSET_CMD_PROTOCOL] = { | |
1549 | .call = ip_set_protocol, | |
1550 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1551 | .policy = ip_set_protocol_policy, | |
1552 | }, | |
1553 | }; | |
1554 | ||
1555 | static struct nfnetlink_subsystem ip_set_netlink_subsys __read_mostly = { | |
1556 | .name = "ip_set", | |
1557 | .subsys_id = NFNL_SUBSYS_IPSET, | |
1558 | .cb_count = IPSET_MSG_MAX, | |
1559 | .cb = ip_set_netlink_subsys_cb, | |
1560 | }; | |
1561 | ||
1562 | /* Interface to iptables/ip6tables */ | |
1563 | ||
1564 | static int | |
1565 | ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len) | |
1566 | { | |
1567 | unsigned *op; | |
1568 | void *data; | |
1569 | int copylen = *len, ret = 0; | |
1570 | ||
1571 | if (!capable(CAP_NET_ADMIN)) | |
1572 | return -EPERM; | |
1573 | if (optval != SO_IP_SET) | |
1574 | return -EBADF; | |
1575 | if (*len < sizeof(unsigned)) | |
1576 | return -EINVAL; | |
1577 | ||
1578 | data = vmalloc(*len); | |
1579 | if (!data) | |
1580 | return -ENOMEM; | |
1581 | if (copy_from_user(data, user, *len) != 0) { | |
1582 | ret = -EFAULT; | |
1583 | goto done; | |
1584 | } | |
1585 | op = (unsigned *) data; | |
1586 | ||
1587 | if (*op < IP_SET_OP_VERSION) { | |
1588 | /* Check the version at the beginning of operations */ | |
1589 | struct ip_set_req_version *req_version = data; | |
1590 | if (req_version->version != IPSET_PROTOCOL) { | |
1591 | ret = -EPROTO; | |
1592 | goto done; | |
1593 | } | |
1594 | } | |
1595 | ||
1596 | switch (*op) { | |
1597 | case IP_SET_OP_VERSION: { | |
1598 | struct ip_set_req_version *req_version = data; | |
1599 | ||
1600 | if (*len != sizeof(struct ip_set_req_version)) { | |
1601 | ret = -EINVAL; | |
1602 | goto done; | |
1603 | } | |
1604 | ||
1605 | req_version->version = IPSET_PROTOCOL; | |
1606 | ret = copy_to_user(user, req_version, | |
1607 | sizeof(struct ip_set_req_version)); | |
1608 | goto done; | |
1609 | } | |
1610 | case IP_SET_OP_GET_BYNAME: { | |
1611 | struct ip_set_req_get_set *req_get = data; | |
1612 | ||
1613 | if (*len != sizeof(struct ip_set_req_get_set)) { | |
1614 | ret = -EINVAL; | |
1615 | goto done; | |
1616 | } | |
1617 | req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; | |
1618 | nfnl_lock(); | |
1619 | req_get->set.index = find_set_id(req_get->set.name); | |
1620 | nfnl_unlock(); | |
1621 | goto copy; | |
1622 | } | |
1623 | case IP_SET_OP_GET_BYINDEX: { | |
1624 | struct ip_set_req_get_set *req_get = data; | |
1625 | ||
1626 | if (*len != sizeof(struct ip_set_req_get_set) || | |
1627 | req_get->set.index >= ip_set_max) { | |
1628 | ret = -EINVAL; | |
1629 | goto done; | |
1630 | } | |
1631 | nfnl_lock(); | |
1632 | strncpy(req_get->set.name, | |
1633 | ip_set_list[req_get->set.index] | |
1634 | ? ip_set_list[req_get->set.index]->name : "", | |
1635 | IPSET_MAXNAMELEN); | |
1636 | nfnl_unlock(); | |
1637 | goto copy; | |
1638 | } | |
1639 | default: | |
1640 | ret = -EBADMSG; | |
1641 | goto done; | |
1642 | } /* end of switch(op) */ | |
1643 | ||
1644 | copy: | |
1645 | ret = copy_to_user(user, data, copylen); | |
1646 | ||
1647 | done: | |
1648 | vfree(data); | |
1649 | if (ret > 0) | |
1650 | ret = 0; | |
1651 | return ret; | |
1652 | } | |
1653 | ||
1654 | static struct nf_sockopt_ops so_set __read_mostly = { | |
1655 | .pf = PF_INET, | |
1656 | .get_optmin = SO_IP_SET, | |
1657 | .get_optmax = SO_IP_SET + 1, | |
1658 | .get = &ip_set_sockfn_get, | |
1659 | .owner = THIS_MODULE, | |
1660 | }; | |
1661 | ||
1662 | static int __init | |
1663 | ip_set_init(void) | |
1664 | { | |
1665 | int ret; | |
1666 | ||
1667 | if (max_sets) | |
1668 | ip_set_max = max_sets; | |
1669 | if (ip_set_max >= IPSET_INVALID_ID) | |
1670 | ip_set_max = IPSET_INVALID_ID - 1; | |
1671 | ||
1672 | ip_set_list = kzalloc(sizeof(struct ip_set *) * ip_set_max, | |
1673 | GFP_KERNEL); | |
1674 | if (!ip_set_list) { | |
1675 | pr_err("ip_set: Unable to create ip_set_list\n"); | |
1676 | return -ENOMEM; | |
1677 | } | |
1678 | ||
1679 | ret = nfnetlink_subsys_register(&ip_set_netlink_subsys); | |
1680 | if (ret != 0) { | |
1681 | pr_err("ip_set: cannot register with nfnetlink.\n"); | |
1682 | kfree(ip_set_list); | |
1683 | return ret; | |
1684 | } | |
1685 | ret = nf_register_sockopt(&so_set); | |
1686 | if (ret != 0) { | |
1687 | pr_err("SO_SET registry failed: %d\n", ret); | |
1688 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); | |
1689 | kfree(ip_set_list); | |
1690 | return ret; | |
1691 | } | |
1692 | ||
1693 | pr_notice("ip_set: protocol %u\n", IPSET_PROTOCOL); | |
1694 | return 0; | |
1695 | } | |
1696 | ||
1697 | static void __exit | |
1698 | ip_set_fini(void) | |
1699 | { | |
1700 | /* There can't be any existing set */ | |
1701 | nf_unregister_sockopt(&so_set); | |
1702 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); | |
1703 | kfree(ip_set_list); | |
1704 | pr_debug("these are the famous last words\n"); | |
1705 | } | |
1706 | ||
1707 | module_init(ip_set_init); | |
1708 | module_exit(ip_set_fini); |