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