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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> | |
b66554cf | 24 | #include <linux/netfilter/x_tables.h> |
a7b4f989 JK |
25 | #include <linux/netfilter/nfnetlink.h> |
26 | #include <linux/netfilter/ipset/ip_set.h> | |
27 | ||
28 | static LIST_HEAD(ip_set_type_list); /* all registered set types */ | |
29 | static DEFINE_MUTEX(ip_set_type_mutex); /* protects ip_set_type_list */ | |
2f9f28b2 | 30 | static DEFINE_RWLOCK(ip_set_ref_lock); /* protects the set refs */ |
a7b4f989 JK |
31 | |
32 | static struct ip_set **ip_set_list; /* all individual sets */ | |
33 | static ip_set_id_t ip_set_max = CONFIG_IP_SET_MAX; /* max number of sets */ | |
34 | ||
35 | #define STREQ(a, b) (strncmp(a, b, IPSET_MAXNAMELEN) == 0) | |
36 | ||
37 | static unsigned int max_sets; | |
38 | ||
39 | module_param(max_sets, int, 0600); | |
40 | MODULE_PARM_DESC(max_sets, "maximal number of sets"); | |
41 | MODULE_LICENSE("GPL"); | |
42 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); | |
43 | MODULE_DESCRIPTION("core IP set support"); | |
44 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_IPSET); | |
45 | ||
46 | /* | |
47 | * The set types are implemented in modules and registered set types | |
48 | * can be found in ip_set_type_list. Adding/deleting types is | |
49 | * serialized by ip_set_type_mutex. | |
50 | */ | |
51 | ||
52 | static inline void | |
53 | ip_set_type_lock(void) | |
54 | { | |
55 | mutex_lock(&ip_set_type_mutex); | |
56 | } | |
57 | ||
58 | static inline void | |
59 | ip_set_type_unlock(void) | |
60 | { | |
61 | mutex_unlock(&ip_set_type_mutex); | |
62 | } | |
63 | ||
64 | /* Register and deregister settype */ | |
65 | ||
66 | static struct ip_set_type * | |
67 | find_set_type(const char *name, u8 family, u8 revision) | |
68 | { | |
69 | struct ip_set_type *type; | |
70 | ||
71 | list_for_each_entry_rcu(type, &ip_set_type_list, list) | |
72 | if (STREQ(type->name, name) && | |
73 | (type->family == family || type->family == AF_UNSPEC) && | |
f1e00b39 JK |
74 | revision >= type->revision_min && |
75 | revision <= type->revision_max) | |
a7b4f989 JK |
76 | return type; |
77 | return NULL; | |
78 | } | |
79 | ||
80 | /* Unlock, try to load a set type module and lock again */ | |
81 | static int | |
82 | try_to_load_type(const char *name) | |
83 | { | |
84 | nfnl_unlock(); | |
85 | pr_debug("try to load ip_set_%s\n", name); | |
86 | if (request_module("ip_set_%s", name) < 0) { | |
87 | pr_warning("Can't find ip_set type %s\n", name); | |
88 | nfnl_lock(); | |
89 | return -IPSET_ERR_FIND_TYPE; | |
90 | } | |
91 | nfnl_lock(); | |
92 | return -EAGAIN; | |
93 | } | |
94 | ||
95 | /* Find a set type and reference it */ | |
96 | static int | |
97 | find_set_type_get(const char *name, u8 family, u8 revision, | |
98 | struct ip_set_type **found) | |
99 | { | |
5c1aba46 JK |
100 | struct ip_set_type *type; |
101 | int err; | |
102 | ||
a7b4f989 JK |
103 | rcu_read_lock(); |
104 | *found = find_set_type(name, family, revision); | |
105 | if (*found) { | |
5c1aba46 JK |
106 | err = !try_module_get((*found)->me) ? -EFAULT : 0; |
107 | goto unlock; | |
a7b4f989 | 108 | } |
5c1aba46 JK |
109 | /* Make sure the type is loaded but we don't support the revision */ |
110 | list_for_each_entry_rcu(type, &ip_set_type_list, list) | |
111 | if (STREQ(type->name, name)) { | |
112 | err = -IPSET_ERR_FIND_TYPE; | |
113 | goto unlock; | |
114 | } | |
a7b4f989 JK |
115 | rcu_read_unlock(); |
116 | ||
117 | return try_to_load_type(name); | |
5c1aba46 JK |
118 | |
119 | unlock: | |
120 | rcu_read_unlock(); | |
121 | return err; | |
a7b4f989 JK |
122 | } |
123 | ||
124 | /* Find a given set type by name and family. | |
125 | * If we succeeded, the supported minimal and maximum revisions are | |
126 | * filled out. | |
127 | */ | |
128 | static int | |
129 | find_set_type_minmax(const char *name, u8 family, u8 *min, u8 *max) | |
130 | { | |
131 | struct ip_set_type *type; | |
132 | bool found = false; | |
133 | ||
5c1aba46 | 134 | *min = 255; *max = 0; |
a7b4f989 JK |
135 | rcu_read_lock(); |
136 | list_for_each_entry_rcu(type, &ip_set_type_list, list) | |
137 | if (STREQ(type->name, name) && | |
138 | (type->family == family || type->family == AF_UNSPEC)) { | |
139 | found = true; | |
f1e00b39 JK |
140 | if (type->revision_min < *min) |
141 | *min = type->revision_min; | |
142 | if (type->revision_max > *max) | |
143 | *max = type->revision_max; | |
a7b4f989 JK |
144 | } |
145 | rcu_read_unlock(); | |
146 | if (found) | |
147 | return 0; | |
148 | ||
149 | return try_to_load_type(name); | |
150 | } | |
151 | ||
152 | #define family_name(f) ((f) == AF_INET ? "inet" : \ | |
153 | (f) == AF_INET6 ? "inet6" : "any") | |
154 | ||
155 | /* Register a set type structure. The type is identified by | |
156 | * the unique triple of name, family and revision. | |
157 | */ | |
158 | int | |
159 | ip_set_type_register(struct ip_set_type *type) | |
160 | { | |
161 | int ret = 0; | |
162 | ||
163 | if (type->protocol != IPSET_PROTOCOL) { | |
f1e00b39 | 164 | pr_warning("ip_set type %s, family %s, revision %u:%u uses " |
a7b4f989 JK |
165 | "wrong protocol version %u (want %u)\n", |
166 | type->name, family_name(type->family), | |
f1e00b39 JK |
167 | type->revision_min, type->revision_max, |
168 | type->protocol, IPSET_PROTOCOL); | |
a7b4f989 JK |
169 | return -EINVAL; |
170 | } | |
171 | ||
172 | ip_set_type_lock(); | |
f1e00b39 | 173 | if (find_set_type(type->name, type->family, type->revision_min)) { |
a7b4f989 | 174 | /* Duplicate! */ |
f1e00b39 | 175 | pr_warning("ip_set type %s, family %s with revision min %u " |
a7b4f989 | 176 | "already registered!\n", type->name, |
f1e00b39 | 177 | family_name(type->family), type->revision_min); |
a7b4f989 JK |
178 | ret = -EINVAL; |
179 | goto unlock; | |
180 | } | |
181 | list_add_rcu(&type->list, &ip_set_type_list); | |
f1e00b39 JK |
182 | pr_debug("type %s, family %s, revision %u:%u registered.\n", |
183 | type->name, family_name(type->family), | |
184 | type->revision_min, type->revision_max); | |
a7b4f989 JK |
185 | unlock: |
186 | ip_set_type_unlock(); | |
187 | return ret; | |
188 | } | |
189 | EXPORT_SYMBOL_GPL(ip_set_type_register); | |
190 | ||
191 | /* Unregister a set type. There's a small race with ip_set_create */ | |
192 | void | |
193 | ip_set_type_unregister(struct ip_set_type *type) | |
194 | { | |
195 | ip_set_type_lock(); | |
f1e00b39 JK |
196 | if (!find_set_type(type->name, type->family, type->revision_min)) { |
197 | pr_warning("ip_set type %s, family %s with revision min %u " | |
a7b4f989 | 198 | "not registered\n", type->name, |
f1e00b39 | 199 | family_name(type->family), type->revision_min); |
a7b4f989 JK |
200 | goto unlock; |
201 | } | |
202 | list_del_rcu(&type->list); | |
f1e00b39 JK |
203 | pr_debug("type %s, family %s with revision min %u unregistered.\n", |
204 | type->name, family_name(type->family), type->revision_min); | |
a7b4f989 JK |
205 | unlock: |
206 | ip_set_type_unlock(); | |
207 | ||
208 | synchronize_rcu(); | |
209 | } | |
210 | EXPORT_SYMBOL_GPL(ip_set_type_unregister); | |
211 | ||
212 | /* Utility functions */ | |
213 | void * | |
214 | ip_set_alloc(size_t size) | |
215 | { | |
216 | void *members = NULL; | |
217 | ||
218 | if (size < KMALLOC_MAX_SIZE) | |
219 | members = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); | |
220 | ||
221 | if (members) { | |
222 | pr_debug("%p: allocated with kmalloc\n", members); | |
223 | return members; | |
224 | } | |
225 | ||
226 | members = vzalloc(size); | |
227 | if (!members) | |
228 | return NULL; | |
229 | pr_debug("%p: allocated with vmalloc\n", members); | |
230 | ||
231 | return members; | |
232 | } | |
233 | EXPORT_SYMBOL_GPL(ip_set_alloc); | |
234 | ||
235 | void | |
236 | ip_set_free(void *members) | |
237 | { | |
238 | pr_debug("%p: free with %s\n", members, | |
239 | is_vmalloc_addr(members) ? "vfree" : "kfree"); | |
240 | if (is_vmalloc_addr(members)) | |
241 | vfree(members); | |
242 | else | |
243 | kfree(members); | |
244 | } | |
245 | EXPORT_SYMBOL_GPL(ip_set_free); | |
246 | ||
247 | static inline bool | |
248 | flag_nested(const struct nlattr *nla) | |
249 | { | |
250 | return nla->nla_type & NLA_F_NESTED; | |
251 | } | |
252 | ||
253 | static const struct nla_policy ipaddr_policy[IPSET_ATTR_IPADDR_MAX + 1] = { | |
254 | [IPSET_ATTR_IPADDR_IPV4] = { .type = NLA_U32 }, | |
255 | [IPSET_ATTR_IPADDR_IPV6] = { .type = NLA_BINARY, | |
256 | .len = sizeof(struct in6_addr) }, | |
257 | }; | |
258 | ||
259 | int | |
260 | ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr) | |
261 | { | |
262 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX+1]; | |
263 | ||
264 | if (unlikely(!flag_nested(nla))) | |
265 | return -IPSET_ERR_PROTOCOL; | |
8da560ce | 266 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy)) |
a7b4f989 JK |
267 | return -IPSET_ERR_PROTOCOL; |
268 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV4))) | |
269 | return -IPSET_ERR_PROTOCOL; | |
270 | ||
271 | *ipaddr = nla_get_be32(tb[IPSET_ATTR_IPADDR_IPV4]); | |
272 | return 0; | |
273 | } | |
274 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr4); | |
275 | ||
276 | int | |
277 | ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr) | |
278 | { | |
279 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX+1]; | |
280 | ||
281 | if (unlikely(!flag_nested(nla))) | |
282 | return -IPSET_ERR_PROTOCOL; | |
283 | ||
8da560ce | 284 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy)) |
a7b4f989 JK |
285 | return -IPSET_ERR_PROTOCOL; |
286 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV6))) | |
287 | return -IPSET_ERR_PROTOCOL; | |
288 | ||
289 | memcpy(ipaddr, nla_data(tb[IPSET_ATTR_IPADDR_IPV6]), | |
290 | sizeof(struct in6_addr)); | |
291 | return 0; | |
292 | } | |
293 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr6); | |
294 | ||
295 | /* | |
296 | * Creating/destroying/renaming/swapping affect the existence and | |
297 | * the properties of a set. All of these can be executed from userspace | |
298 | * only and serialized by the nfnl mutex indirectly from nfnetlink. | |
299 | * | |
300 | * Sets are identified by their index in ip_set_list and the index | |
301 | * is used by the external references (set/SET netfilter modules). | |
302 | * | |
303 | * The set behind an index may change by swapping only, from userspace. | |
304 | */ | |
305 | ||
306 | static inline void | |
307 | __ip_set_get(ip_set_id_t index) | |
308 | { | |
2f9f28b2 JK |
309 | write_lock_bh(&ip_set_ref_lock); |
310 | ip_set_list[index]->ref++; | |
311 | write_unlock_bh(&ip_set_ref_lock); | |
a7b4f989 JK |
312 | } |
313 | ||
314 | static inline void | |
315 | __ip_set_put(ip_set_id_t index) | |
316 | { | |
2f9f28b2 JK |
317 | write_lock_bh(&ip_set_ref_lock); |
318 | BUG_ON(ip_set_list[index]->ref == 0); | |
319 | ip_set_list[index]->ref--; | |
320 | write_unlock_bh(&ip_set_ref_lock); | |
a7b4f989 JK |
321 | } |
322 | ||
323 | /* | |
324 | * Add, del and test set entries from kernel. | |
325 | * | |
326 | * The set behind the index must exist and must be referenced | |
327 | * so it can't be destroyed (or changed) under our foot. | |
328 | */ | |
329 | ||
330 | int | |
331 | ip_set_test(ip_set_id_t index, const struct sk_buff *skb, | |
b66554cf | 332 | const struct xt_action_param *par, |
ac8cc925 | 333 | const struct ip_set_adt_opt *opt) |
a7b4f989 JK |
334 | { |
335 | struct ip_set *set = ip_set_list[index]; | |
336 | int ret = 0; | |
337 | ||
2f9f28b2 | 338 | BUG_ON(set == NULL); |
a7b4f989 JK |
339 | pr_debug("set %s, index %u\n", set->name, index); |
340 | ||
ac8cc925 JK |
341 | if (opt->dim < set->type->dimension || |
342 | !(opt->family == set->family || set->family == AF_UNSPEC)) | |
a7b4f989 JK |
343 | return 0; |
344 | ||
345 | read_lock_bh(&set->lock); | |
b66554cf | 346 | ret = set->variant->kadt(set, skb, par, IPSET_TEST, opt); |
a7b4f989 JK |
347 | read_unlock_bh(&set->lock); |
348 | ||
349 | if (ret == -EAGAIN) { | |
350 | /* Type requests element to be completed */ | |
351 | pr_debug("element must be competed, ADD is triggered\n"); | |
352 | write_lock_bh(&set->lock); | |
b66554cf | 353 | set->variant->kadt(set, skb, par, IPSET_ADD, opt); |
a7b4f989 JK |
354 | write_unlock_bh(&set->lock); |
355 | ret = 1; | |
356 | } | |
357 | ||
358 | /* Convert error codes to nomatch */ | |
359 | return (ret < 0 ? 0 : ret); | |
360 | } | |
361 | EXPORT_SYMBOL_GPL(ip_set_test); | |
362 | ||
363 | int | |
364 | ip_set_add(ip_set_id_t index, const struct sk_buff *skb, | |
b66554cf | 365 | const struct xt_action_param *par, |
ac8cc925 | 366 | const struct ip_set_adt_opt *opt) |
a7b4f989 JK |
367 | { |
368 | struct ip_set *set = ip_set_list[index]; | |
369 | int ret; | |
370 | ||
2f9f28b2 | 371 | BUG_ON(set == NULL); |
a7b4f989 JK |
372 | pr_debug("set %s, index %u\n", set->name, index); |
373 | ||
ac8cc925 JK |
374 | if (opt->dim < set->type->dimension || |
375 | !(opt->family == set->family || set->family == AF_UNSPEC)) | |
a7b4f989 JK |
376 | return 0; |
377 | ||
378 | write_lock_bh(&set->lock); | |
b66554cf | 379 | ret = set->variant->kadt(set, skb, par, IPSET_ADD, opt); |
a7b4f989 JK |
380 | write_unlock_bh(&set->lock); |
381 | ||
382 | return ret; | |
383 | } | |
384 | EXPORT_SYMBOL_GPL(ip_set_add); | |
385 | ||
386 | int | |
387 | ip_set_del(ip_set_id_t index, const struct sk_buff *skb, | |
b66554cf | 388 | const struct xt_action_param *par, |
ac8cc925 | 389 | const struct ip_set_adt_opt *opt) |
a7b4f989 JK |
390 | { |
391 | struct ip_set *set = ip_set_list[index]; | |
392 | int ret = 0; | |
393 | ||
2f9f28b2 | 394 | BUG_ON(set == NULL); |
a7b4f989 JK |
395 | pr_debug("set %s, index %u\n", set->name, index); |
396 | ||
ac8cc925 JK |
397 | if (opt->dim < set->type->dimension || |
398 | !(opt->family == set->family || set->family == AF_UNSPEC)) | |
a7b4f989 JK |
399 | return 0; |
400 | ||
401 | write_lock_bh(&set->lock); | |
b66554cf | 402 | ret = set->variant->kadt(set, skb, par, IPSET_DEL, opt); |
a7b4f989 JK |
403 | write_unlock_bh(&set->lock); |
404 | ||
405 | return ret; | |
406 | } | |
407 | EXPORT_SYMBOL_GPL(ip_set_del); | |
408 | ||
409 | /* | |
410 | * Find set by name, reference it once. The reference makes sure the | |
411 | * thing pointed to, does not go away under our feet. | |
412 | * | |
a7b4f989 JK |
413 | */ |
414 | ip_set_id_t | |
415 | ip_set_get_byname(const char *name, struct ip_set **set) | |
416 | { | |
417 | ip_set_id_t i, index = IPSET_INVALID_ID; | |
418 | struct ip_set *s; | |
419 | ||
420 | for (i = 0; i < ip_set_max; i++) { | |
421 | s = ip_set_list[i]; | |
422 | if (s != NULL && STREQ(s->name, name)) { | |
423 | __ip_set_get(i); | |
424 | index = i; | |
425 | *set = s; | |
426 | } | |
427 | } | |
428 | ||
429 | return index; | |
430 | } | |
431 | EXPORT_SYMBOL_GPL(ip_set_get_byname); | |
432 | ||
433 | /* | |
434 | * If the given set pointer points to a valid set, decrement | |
435 | * reference count by 1. The caller shall not assume the index | |
436 | * to be valid, after calling this function. | |
437 | * | |
a7b4f989 JK |
438 | */ |
439 | void | |
440 | ip_set_put_byindex(ip_set_id_t index) | |
441 | { | |
2f9f28b2 | 442 | if (ip_set_list[index] != NULL) |
a7b4f989 | 443 | __ip_set_put(index); |
a7b4f989 JK |
444 | } |
445 | EXPORT_SYMBOL_GPL(ip_set_put_byindex); | |
446 | ||
447 | /* | |
448 | * Get the name of a set behind a set index. | |
449 | * We assume the set is referenced, so it does exist and | |
450 | * can't be destroyed. The set cannot be renamed due to | |
451 | * the referencing either. | |
452 | * | |
a7b4f989 JK |
453 | */ |
454 | const char * | |
455 | ip_set_name_byindex(ip_set_id_t index) | |
456 | { | |
457 | const struct ip_set *set = ip_set_list[index]; | |
458 | ||
459 | BUG_ON(set == NULL); | |
2f9f28b2 | 460 | BUG_ON(set->ref == 0); |
a7b4f989 JK |
461 | |
462 | /* Referenced, so it's safe */ | |
463 | return set->name; | |
464 | } | |
465 | EXPORT_SYMBOL_GPL(ip_set_name_byindex); | |
466 | ||
467 | /* | |
468 | * Routines to call by external subsystems, which do not | |
469 | * call nfnl_lock for us. | |
470 | */ | |
471 | ||
472 | /* | |
473 | * Find set by name, reference it once. The reference makes sure the | |
474 | * thing pointed to, does not go away under our feet. | |
475 | * | |
476 | * The nfnl mutex is used in the function. | |
477 | */ | |
478 | ip_set_id_t | |
479 | ip_set_nfnl_get(const char *name) | |
480 | { | |
481 | struct ip_set *s; | |
482 | ip_set_id_t index; | |
483 | ||
484 | nfnl_lock(); | |
485 | index = ip_set_get_byname(name, &s); | |
486 | nfnl_unlock(); | |
487 | ||
488 | return index; | |
489 | } | |
490 | EXPORT_SYMBOL_GPL(ip_set_nfnl_get); | |
491 | ||
492 | /* | |
493 | * Find set by index, reference it once. The reference makes sure the | |
494 | * thing pointed to, does not go away under our feet. | |
495 | * | |
496 | * The nfnl mutex is used in the function. | |
497 | */ | |
498 | ip_set_id_t | |
499 | ip_set_nfnl_get_byindex(ip_set_id_t index) | |
500 | { | |
501 | if (index > ip_set_max) | |
502 | return IPSET_INVALID_ID; | |
503 | ||
504 | nfnl_lock(); | |
505 | if (ip_set_list[index]) | |
506 | __ip_set_get(index); | |
507 | else | |
508 | index = IPSET_INVALID_ID; | |
509 | nfnl_unlock(); | |
510 | ||
511 | return index; | |
512 | } | |
513 | EXPORT_SYMBOL_GPL(ip_set_nfnl_get_byindex); | |
514 | ||
515 | /* | |
516 | * If the given set pointer points to a valid set, decrement | |
517 | * reference count by 1. The caller shall not assume the index | |
518 | * to be valid, after calling this function. | |
519 | * | |
520 | * The nfnl mutex is used in the function. | |
521 | */ | |
522 | void | |
523 | ip_set_nfnl_put(ip_set_id_t index) | |
524 | { | |
525 | nfnl_lock(); | |
2f9f28b2 | 526 | ip_set_put_byindex(index); |
a7b4f989 JK |
527 | nfnl_unlock(); |
528 | } | |
529 | EXPORT_SYMBOL_GPL(ip_set_nfnl_put); | |
530 | ||
531 | /* | |
532 | * Communication protocol with userspace over netlink. | |
533 | * | |
2f9f28b2 | 534 | * The commands are serialized by the nfnl mutex. |
a7b4f989 JK |
535 | */ |
536 | ||
537 | static inline bool | |
538 | protocol_failed(const struct nlattr * const tb[]) | |
539 | { | |
540 | return !tb[IPSET_ATTR_PROTOCOL] || | |
541 | nla_get_u8(tb[IPSET_ATTR_PROTOCOL]) != IPSET_PROTOCOL; | |
542 | } | |
543 | ||
544 | static inline u32 | |
545 | flag_exist(const struct nlmsghdr *nlh) | |
546 | { | |
547 | return nlh->nlmsg_flags & NLM_F_EXCL ? 0 : IPSET_FLAG_EXIST; | |
548 | } | |
549 | ||
550 | static struct nlmsghdr * | |
551 | start_msg(struct sk_buff *skb, u32 pid, u32 seq, unsigned int flags, | |
552 | enum ipset_cmd cmd) | |
553 | { | |
554 | struct nlmsghdr *nlh; | |
555 | struct nfgenmsg *nfmsg; | |
556 | ||
557 | nlh = nlmsg_put(skb, pid, seq, cmd | (NFNL_SUBSYS_IPSET << 8), | |
558 | sizeof(*nfmsg), flags); | |
559 | if (nlh == NULL) | |
560 | return NULL; | |
561 | ||
562 | nfmsg = nlmsg_data(nlh); | |
563 | nfmsg->nfgen_family = AF_INET; | |
564 | nfmsg->version = NFNETLINK_V0; | |
565 | nfmsg->res_id = 0; | |
566 | ||
567 | return nlh; | |
568 | } | |
569 | ||
570 | /* Create a set */ | |
571 | ||
572 | static const struct nla_policy ip_set_create_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
573 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
574 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
575 | .len = IPSET_MAXNAMELEN - 1 }, | |
576 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, | |
577 | .len = IPSET_MAXNAMELEN - 1}, | |
578 | [IPSET_ATTR_REVISION] = { .type = NLA_U8 }, | |
579 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, | |
580 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, | |
581 | }; | |
582 | ||
583 | static ip_set_id_t | |
584 | find_set_id(const char *name) | |
585 | { | |
586 | ip_set_id_t i, index = IPSET_INVALID_ID; | |
587 | const struct ip_set *set; | |
588 | ||
589 | for (i = 0; index == IPSET_INVALID_ID && i < ip_set_max; i++) { | |
590 | set = ip_set_list[i]; | |
591 | if (set != NULL && STREQ(set->name, name)) | |
592 | index = i; | |
593 | } | |
594 | return index; | |
595 | } | |
596 | ||
597 | static inline struct ip_set * | |
598 | find_set(const char *name) | |
599 | { | |
600 | ip_set_id_t index = find_set_id(name); | |
601 | ||
602 | return index == IPSET_INVALID_ID ? NULL : ip_set_list[index]; | |
603 | } | |
604 | ||
605 | static int | |
606 | find_free_id(const char *name, ip_set_id_t *index, struct ip_set **set) | |
607 | { | |
608 | ip_set_id_t i; | |
609 | ||
610 | *index = IPSET_INVALID_ID; | |
611 | for (i = 0; i < ip_set_max; i++) { | |
612 | if (ip_set_list[i] == NULL) { | |
613 | if (*index == IPSET_INVALID_ID) | |
614 | *index = i; | |
615 | } else if (STREQ(name, ip_set_list[i]->name)) { | |
616 | /* Name clash */ | |
617 | *set = ip_set_list[i]; | |
618 | return -EEXIST; | |
619 | } | |
620 | } | |
621 | if (*index == IPSET_INVALID_ID) | |
622 | /* No free slot remained */ | |
623 | return -IPSET_ERR_MAX_SETS; | |
624 | return 0; | |
625 | } | |
626 | ||
627 | static int | |
628 | ip_set_create(struct sock *ctnl, struct sk_buff *skb, | |
629 | const struct nlmsghdr *nlh, | |
630 | const struct nlattr * const attr[]) | |
631 | { | |
9846ada1 | 632 | struct ip_set *set, *clash = NULL; |
a7b4f989 JK |
633 | ip_set_id_t index = IPSET_INVALID_ID; |
634 | struct nlattr *tb[IPSET_ATTR_CREATE_MAX+1] = {}; | |
635 | const char *name, *typename; | |
636 | u8 family, revision; | |
637 | u32 flags = flag_exist(nlh); | |
638 | int ret = 0; | |
639 | ||
640 | if (unlikely(protocol_failed(attr) || | |
641 | attr[IPSET_ATTR_SETNAME] == NULL || | |
642 | attr[IPSET_ATTR_TYPENAME] == NULL || | |
643 | attr[IPSET_ATTR_REVISION] == NULL || | |
644 | attr[IPSET_ATTR_FAMILY] == NULL || | |
645 | (attr[IPSET_ATTR_DATA] != NULL && | |
646 | !flag_nested(attr[IPSET_ATTR_DATA])))) | |
647 | return -IPSET_ERR_PROTOCOL; | |
648 | ||
649 | name = nla_data(attr[IPSET_ATTR_SETNAME]); | |
650 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); | |
651 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); | |
652 | revision = nla_get_u8(attr[IPSET_ATTR_REVISION]); | |
653 | pr_debug("setname: %s, typename: %s, family: %s, revision: %u\n", | |
654 | name, typename, family_name(family), revision); | |
655 | ||
656 | /* | |
657 | * First, and without any locks, allocate and initialize | |
658 | * a normal base set structure. | |
659 | */ | |
660 | set = kzalloc(sizeof(struct ip_set), GFP_KERNEL); | |
661 | if (!set) | |
662 | return -ENOMEM; | |
663 | rwlock_init(&set->lock); | |
664 | strlcpy(set->name, name, IPSET_MAXNAMELEN); | |
a7b4f989 | 665 | set->family = family; |
f1e00b39 | 666 | set->revision = revision; |
a7b4f989 JK |
667 | |
668 | /* | |
669 | * Next, check that we know the type, and take | |
670 | * a reference on the type, to make sure it stays available | |
671 | * while constructing our new set. | |
672 | * | |
673 | * After referencing the type, we try to create the type | |
674 | * specific part of the set without holding any locks. | |
675 | */ | |
676 | ret = find_set_type_get(typename, family, revision, &(set->type)); | |
677 | if (ret) | |
678 | goto out; | |
679 | ||
680 | /* | |
681 | * Without holding any locks, create private part. | |
682 | */ | |
683 | if (attr[IPSET_ATTR_DATA] && | |
8da560ce PM |
684 | nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA], |
685 | set->type->create_policy)) { | |
a7b4f989 JK |
686 | ret = -IPSET_ERR_PROTOCOL; |
687 | goto put_out; | |
688 | } | |
689 | ||
690 | ret = set->type->create(set, tb, flags); | |
691 | if (ret != 0) | |
692 | goto put_out; | |
693 | ||
694 | /* BTW, ret==0 here. */ | |
695 | ||
696 | /* | |
697 | * Here, we have a valid, constructed set and we are protected | |
2f9f28b2 JK |
698 | * by the nfnl mutex. Find the first free index in ip_set_list |
699 | * and check clashing. | |
a7b4f989 JK |
700 | */ |
701 | if ((ret = find_free_id(set->name, &index, &clash)) != 0) { | |
702 | /* If this is the same set and requested, ignore error */ | |
703 | if (ret == -EEXIST && | |
704 | (flags & IPSET_FLAG_EXIST) && | |
705 | STREQ(set->type->name, clash->type->name) && | |
706 | set->type->family == clash->type->family && | |
f1e00b39 JK |
707 | set->type->revision_min == clash->type->revision_min && |
708 | set->type->revision_max == clash->type->revision_max && | |
a7b4f989 JK |
709 | set->variant->same_set(set, clash)) |
710 | ret = 0; | |
711 | goto cleanup; | |
712 | } | |
713 | ||
714 | /* | |
715 | * Finally! Add our shiny new set to the list, and be done. | |
716 | */ | |
717 | pr_debug("create: '%s' created with index %u!\n", set->name, index); | |
718 | ip_set_list[index] = set; | |
719 | ||
720 | return ret; | |
721 | ||
722 | cleanup: | |
723 | set->variant->destroy(set); | |
724 | put_out: | |
725 | module_put(set->type->me); | |
726 | out: | |
727 | kfree(set); | |
728 | return ret; | |
729 | } | |
730 | ||
731 | /* Destroy sets */ | |
732 | ||
733 | static const struct nla_policy | |
734 | ip_set_setname_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
735 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
736 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
737 | .len = IPSET_MAXNAMELEN - 1 }, | |
738 | }; | |
739 | ||
740 | static void | |
741 | ip_set_destroy_set(ip_set_id_t index) | |
742 | { | |
743 | struct ip_set *set = ip_set_list[index]; | |
744 | ||
745 | pr_debug("set: %s\n", set->name); | |
746 | ip_set_list[index] = NULL; | |
747 | ||
748 | /* Must call it without holding any lock */ | |
749 | set->variant->destroy(set); | |
750 | module_put(set->type->me); | |
751 | kfree(set); | |
752 | } | |
753 | ||
754 | static int | |
755 | ip_set_destroy(struct sock *ctnl, struct sk_buff *skb, | |
756 | const struct nlmsghdr *nlh, | |
757 | const struct nlattr * const attr[]) | |
758 | { | |
759 | ip_set_id_t i; | |
2f9f28b2 | 760 | int ret = 0; |
a7b4f989 JK |
761 | |
762 | if (unlikely(protocol_failed(attr))) | |
763 | return -IPSET_ERR_PROTOCOL; | |
764 | ||
2f9f28b2 JK |
765 | /* Commands are serialized and references are |
766 | * protected by the ip_set_ref_lock. | |
767 | * External systems (i.e. xt_set) must call | |
768 | * ip_set_put|get_nfnl_* functions, that way we | |
769 | * can safely check references here. | |
770 | * | |
771 | * list:set timer can only decrement the reference | |
772 | * counter, so if it's already zero, we can proceed | |
773 | * without holding the lock. | |
774 | */ | |
775 | read_lock_bh(&ip_set_ref_lock); | |
a7b4f989 JK |
776 | if (!attr[IPSET_ATTR_SETNAME]) { |
777 | for (i = 0; i < ip_set_max; i++) { | |
2f9f28b2 JK |
778 | if (ip_set_list[i] != NULL && ip_set_list[i]->ref) { |
779 | ret = IPSET_ERR_BUSY; | |
780 | goto out; | |
781 | } | |
a7b4f989 | 782 | } |
2f9f28b2 | 783 | read_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
784 | for (i = 0; i < ip_set_max; i++) { |
785 | if (ip_set_list[i] != NULL) | |
786 | ip_set_destroy_set(i); | |
787 | } | |
788 | } else { | |
789 | i = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME])); | |
2f9f28b2 JK |
790 | if (i == IPSET_INVALID_ID) { |
791 | ret = -ENOENT; | |
792 | goto out; | |
793 | } else if (ip_set_list[i]->ref) { | |
794 | ret = -IPSET_ERR_BUSY; | |
795 | goto out; | |
796 | } | |
797 | read_unlock_bh(&ip_set_ref_lock); | |
a7b4f989 JK |
798 | |
799 | ip_set_destroy_set(i); | |
800 | } | |
801 | return 0; | |
2f9f28b2 JK |
802 | out: |
803 | read_unlock_bh(&ip_set_ref_lock); | |
804 | return ret; | |
a7b4f989 JK |
805 | } |
806 | ||
807 | /* Flush sets */ | |
808 | ||
809 | static void | |
810 | ip_set_flush_set(struct ip_set *set) | |
811 | { | |
812 | pr_debug("set: %s\n", set->name); | |
813 | ||
814 | write_lock_bh(&set->lock); | |
815 | set->variant->flush(set); | |
816 | write_unlock_bh(&set->lock); | |
817 | } | |
818 | ||
819 | static int | |
820 | ip_set_flush(struct sock *ctnl, struct sk_buff *skb, | |
821 | const struct nlmsghdr *nlh, | |
822 | const struct nlattr * const attr[]) | |
823 | { | |
824 | ip_set_id_t i; | |
825 | ||
826 | if (unlikely(protocol_failed(attr))) | |
9184a9cb | 827 | return -IPSET_ERR_PROTOCOL; |
a7b4f989 JK |
828 | |
829 | if (!attr[IPSET_ATTR_SETNAME]) { | |
830 | for (i = 0; i < ip_set_max; i++) | |
831 | if (ip_set_list[i] != NULL) | |
832 | ip_set_flush_set(ip_set_list[i]); | |
833 | } else { | |
834 | i = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME])); | |
835 | if (i == IPSET_INVALID_ID) | |
836 | return -ENOENT; | |
837 | ||
838 | ip_set_flush_set(ip_set_list[i]); | |
839 | } | |
840 | ||
841 | return 0; | |
842 | } | |
843 | ||
844 | /* Rename a set */ | |
845 | ||
846 | static const struct nla_policy | |
847 | ip_set_setname2_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
848 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
849 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
850 | .len = IPSET_MAXNAMELEN - 1 }, | |
851 | [IPSET_ATTR_SETNAME2] = { .type = NLA_NUL_STRING, | |
852 | .len = IPSET_MAXNAMELEN - 1 }, | |
853 | }; | |
854 | ||
855 | static int | |
856 | ip_set_rename(struct sock *ctnl, struct sk_buff *skb, | |
857 | const struct nlmsghdr *nlh, | |
858 | const struct nlattr * const attr[]) | |
859 | { | |
860 | struct ip_set *set; | |
861 | const char *name2; | |
862 | ip_set_id_t i; | |
2f9f28b2 | 863 | int ret = 0; |
a7b4f989 JK |
864 | |
865 | if (unlikely(protocol_failed(attr) || | |
866 | attr[IPSET_ATTR_SETNAME] == NULL || | |
867 | attr[IPSET_ATTR_SETNAME2] == NULL)) | |
868 | return -IPSET_ERR_PROTOCOL; | |
869 | ||
870 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); | |
871 | if (set == NULL) | |
872 | return -ENOENT; | |
2f9f28b2 JK |
873 | |
874 | read_lock_bh(&ip_set_ref_lock); | |
875 | if (set->ref != 0) { | |
876 | ret = -IPSET_ERR_REFERENCED; | |
877 | goto out; | |
878 | } | |
a7b4f989 JK |
879 | |
880 | name2 = nla_data(attr[IPSET_ATTR_SETNAME2]); | |
881 | for (i = 0; i < ip_set_max; i++) { | |
882 | if (ip_set_list[i] != NULL && | |
2f9f28b2 JK |
883 | STREQ(ip_set_list[i]->name, name2)) { |
884 | ret = -IPSET_ERR_EXIST_SETNAME2; | |
885 | goto out; | |
886 | } | |
a7b4f989 JK |
887 | } |
888 | strncpy(set->name, name2, IPSET_MAXNAMELEN); | |
889 | ||
2f9f28b2 JK |
890 | out: |
891 | read_unlock_bh(&ip_set_ref_lock); | |
892 | return ret; | |
a7b4f989 JK |
893 | } |
894 | ||
895 | /* Swap two sets so that name/index points to the other. | |
896 | * References and set names are also swapped. | |
897 | * | |
2f9f28b2 JK |
898 | * The commands are serialized by the nfnl mutex and references are |
899 | * protected by the ip_set_ref_lock. The kernel interfaces | |
a7b4f989 JK |
900 | * do not hold the mutex but the pointer settings are atomic |
901 | * so the ip_set_list always contains valid pointers to the sets. | |
902 | */ | |
903 | ||
904 | static int | |
905 | ip_set_swap(struct sock *ctnl, struct sk_buff *skb, | |
906 | const struct nlmsghdr *nlh, | |
907 | const struct nlattr * const attr[]) | |
908 | { | |
909 | struct ip_set *from, *to; | |
910 | ip_set_id_t from_id, to_id; | |
911 | char from_name[IPSET_MAXNAMELEN]; | |
a7b4f989 JK |
912 | |
913 | if (unlikely(protocol_failed(attr) || | |
914 | attr[IPSET_ATTR_SETNAME] == NULL || | |
915 | attr[IPSET_ATTR_SETNAME2] == NULL)) | |
916 | return -IPSET_ERR_PROTOCOL; | |
917 | ||
918 | from_id = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME])); | |
919 | if (from_id == IPSET_INVALID_ID) | |
920 | return -ENOENT; | |
921 | ||
922 | to_id = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME2])); | |
923 | if (to_id == IPSET_INVALID_ID) | |
924 | return -IPSET_ERR_EXIST_SETNAME2; | |
925 | ||
926 | from = ip_set_list[from_id]; | |
927 | to = ip_set_list[to_id]; | |
928 | ||
929 | /* Features must not change. | |
25985edc | 930 | * Not an artificial restriction anymore, as we must prevent |
a7b4f989 JK |
931 | * possible loops created by swapping in setlist type of sets. */ |
932 | if (!(from->type->features == to->type->features && | |
933 | from->type->family == to->type->family)) | |
934 | return -IPSET_ERR_TYPE_MISMATCH; | |
935 | ||
a7b4f989 | 936 | strncpy(from_name, from->name, IPSET_MAXNAMELEN); |
a7b4f989 | 937 | strncpy(from->name, to->name, IPSET_MAXNAMELEN); |
a7b4f989 | 938 | strncpy(to->name, from_name, IPSET_MAXNAMELEN); |
a7b4f989 | 939 | |
2f9f28b2 JK |
940 | write_lock_bh(&ip_set_ref_lock); |
941 | swap(from->ref, to->ref); | |
a7b4f989 JK |
942 | ip_set_list[from_id] = to; |
943 | ip_set_list[to_id] = from; | |
2f9f28b2 | 944 | write_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
945 | |
946 | return 0; | |
947 | } | |
948 | ||
949 | /* List/save set data */ | |
950 | ||
c1e2e043 JK |
951 | #define DUMP_INIT 0 |
952 | #define DUMP_ALL 1 | |
953 | #define DUMP_ONE 2 | |
954 | #define DUMP_LAST 3 | |
955 | ||
956 | #define DUMP_TYPE(arg) (((u32)(arg)) & 0x0000FFFF) | |
957 | #define DUMP_FLAGS(arg) (((u32)(arg)) >> 16) | |
a7b4f989 JK |
958 | |
959 | static int | |
960 | ip_set_dump_done(struct netlink_callback *cb) | |
961 | { | |
962 | if (cb->args[2]) { | |
963 | pr_debug("release set %s\n", ip_set_list[cb->args[1]]->name); | |
2f9f28b2 | 964 | ip_set_put_byindex((ip_set_id_t) cb->args[1]); |
a7b4f989 JK |
965 | } |
966 | return 0; | |
967 | } | |
968 | ||
969 | static inline void | |
970 | dump_attrs(struct nlmsghdr *nlh) | |
971 | { | |
972 | const struct nlattr *attr; | |
973 | int rem; | |
974 | ||
975 | pr_debug("dump nlmsg\n"); | |
976 | nlmsg_for_each_attr(attr, nlh, sizeof(struct nfgenmsg), rem) { | |
977 | pr_debug("type: %u, len %u\n", nla_type(attr), attr->nla_len); | |
978 | } | |
979 | } | |
980 | ||
981 | static int | |
982 | dump_init(struct netlink_callback *cb) | |
983 | { | |
984 | struct nlmsghdr *nlh = nlmsg_hdr(cb->skb); | |
985 | int min_len = NLMSG_SPACE(sizeof(struct nfgenmsg)); | |
986 | struct nlattr *cda[IPSET_ATTR_CMD_MAX+1]; | |
987 | struct nlattr *attr = (void *)nlh + min_len; | |
c1e2e043 | 988 | u32 dump_type; |
a7b4f989 JK |
989 | ip_set_id_t index; |
990 | ||
991 | /* Second pass, so parser can't fail */ | |
992 | nla_parse(cda, IPSET_ATTR_CMD_MAX, | |
993 | attr, nlh->nlmsg_len - min_len, ip_set_setname_policy); | |
994 | ||
995 | /* cb->args[0] : dump single set/all sets | |
996 | * [1] : set index | |
997 | * [..]: type specific | |
998 | */ | |
999 | ||
c1e2e043 JK |
1000 | if (cda[IPSET_ATTR_SETNAME]) { |
1001 | index = find_set_id(nla_data(cda[IPSET_ATTR_SETNAME])); | |
1002 | if (index == IPSET_INVALID_ID) | |
1003 | return -ENOENT; | |
a7b4f989 | 1004 | |
c1e2e043 JK |
1005 | dump_type = DUMP_ONE; |
1006 | cb->args[1] = index; | |
1007 | } else | |
1008 | dump_type = DUMP_ALL; | |
1009 | ||
1010 | if (cda[IPSET_ATTR_FLAGS]) { | |
1011 | u32 f = ip_set_get_h32(cda[IPSET_ATTR_FLAGS]); | |
1012 | dump_type |= (f << 16); | |
1013 | } | |
1014 | cb->args[0] = dump_type; | |
a7b4f989 | 1015 | |
a7b4f989 JK |
1016 | return 0; |
1017 | } | |
1018 | ||
1019 | static int | |
1020 | ip_set_dump_start(struct sk_buff *skb, struct netlink_callback *cb) | |
1021 | { | |
1022 | ip_set_id_t index = IPSET_INVALID_ID, max; | |
1023 | struct ip_set *set = NULL; | |
1024 | struct nlmsghdr *nlh = NULL; | |
1025 | unsigned int flags = NETLINK_CB(cb->skb).pid ? NLM_F_MULTI : 0; | |
c1e2e043 | 1026 | u32 dump_type, dump_flags; |
a7b4f989 JK |
1027 | int ret = 0; |
1028 | ||
c1e2e043 | 1029 | if (!cb->args[0]) { |
a7b4f989 JK |
1030 | ret = dump_init(cb); |
1031 | if (ret < 0) { | |
1032 | nlh = nlmsg_hdr(cb->skb); | |
1033 | /* We have to create and send the error message | |
1034 | * manually :-( */ | |
1035 | if (nlh->nlmsg_flags & NLM_F_ACK) | |
1036 | netlink_ack(cb->skb, nlh, ret); | |
1037 | return ret; | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | if (cb->args[1] >= ip_set_max) | |
1042 | goto out; | |
1043 | ||
c1e2e043 JK |
1044 | dump_type = DUMP_TYPE(cb->args[0]); |
1045 | dump_flags = DUMP_FLAGS(cb->args[0]); | |
1046 | max = dump_type == DUMP_ONE ? cb->args[1] + 1 : ip_set_max; | |
a8a8a093 | 1047 | dump_last: |
c1e2e043 JK |
1048 | pr_debug("args[0]: %u %u args[1]: %ld\n", |
1049 | dump_type, dump_flags, cb->args[1]); | |
a7b4f989 JK |
1050 | for (; cb->args[1] < max; cb->args[1]++) { |
1051 | index = (ip_set_id_t) cb->args[1]; | |
1052 | set = ip_set_list[index]; | |
1053 | if (set == NULL) { | |
c1e2e043 | 1054 | if (dump_type == DUMP_ONE) { |
a7b4f989 JK |
1055 | ret = -ENOENT; |
1056 | goto out; | |
1057 | } | |
1058 | continue; | |
1059 | } | |
1060 | /* When dumping all sets, we must dump "sorted" | |
1061 | * so that lists (unions of sets) are dumped last. | |
1062 | */ | |
c1e2e043 JK |
1063 | if (dump_type != DUMP_ONE && |
1064 | ((dump_type == DUMP_ALL) == | |
a8a8a093 | 1065 | !!(set->type->features & IPSET_DUMP_LAST))) |
a7b4f989 JK |
1066 | continue; |
1067 | pr_debug("List set: %s\n", set->name); | |
1068 | if (!cb->args[2]) { | |
1069 | /* Start listing: make sure set won't be destroyed */ | |
1070 | pr_debug("reference set\n"); | |
1071 | __ip_set_get(index); | |
1072 | } | |
1073 | nlh = start_msg(skb, NETLINK_CB(cb->skb).pid, | |
1074 | cb->nlh->nlmsg_seq, flags, | |
1075 | IPSET_CMD_LIST); | |
1076 | if (!nlh) { | |
1077 | ret = -EMSGSIZE; | |
1078 | goto release_refcount; | |
1079 | } | |
1080 | NLA_PUT_U8(skb, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL); | |
1081 | NLA_PUT_STRING(skb, IPSET_ATTR_SETNAME, set->name); | |
c1e2e043 JK |
1082 | if (dump_flags & IPSET_FLAG_LIST_SETNAME) |
1083 | goto next_set; | |
a7b4f989 JK |
1084 | switch (cb->args[2]) { |
1085 | case 0: | |
1086 | /* Core header data */ | |
1087 | NLA_PUT_STRING(skb, IPSET_ATTR_TYPENAME, | |
1088 | set->type->name); | |
1089 | NLA_PUT_U8(skb, IPSET_ATTR_FAMILY, | |
1090 | set->family); | |
1091 | NLA_PUT_U8(skb, IPSET_ATTR_REVISION, | |
f1e00b39 | 1092 | set->revision); |
a7b4f989 JK |
1093 | ret = set->variant->head(set, skb); |
1094 | if (ret < 0) | |
1095 | goto release_refcount; | |
c1e2e043 JK |
1096 | if (dump_flags & IPSET_FLAG_LIST_HEADER) |
1097 | goto next_set; | |
a7b4f989 JK |
1098 | /* Fall through and add elements */ |
1099 | default: | |
1100 | read_lock_bh(&set->lock); | |
1101 | ret = set->variant->list(set, skb, cb); | |
1102 | read_unlock_bh(&set->lock); | |
c1e2e043 | 1103 | if (!cb->args[2]) |
a7b4f989 | 1104 | /* Set is done, proceed with next one */ |
c1e2e043 | 1105 | goto next_set; |
a7b4f989 JK |
1106 | goto release_refcount; |
1107 | } | |
1108 | } | |
a8a8a093 | 1109 | /* If we dump all sets, continue with dumping last ones */ |
c1e2e043 JK |
1110 | if (dump_type == DUMP_ALL) { |
1111 | dump_type = DUMP_LAST; | |
1112 | cb->args[0] = dump_type | (dump_flags << 16); | |
a8a8a093 JK |
1113 | cb->args[1] = 0; |
1114 | goto dump_last; | |
1115 | } | |
a7b4f989 JK |
1116 | goto out; |
1117 | ||
1118 | nla_put_failure: | |
1119 | ret = -EFAULT; | |
c1e2e043 JK |
1120 | next_set: |
1121 | if (dump_type == DUMP_ONE) | |
1122 | cb->args[1] = IPSET_INVALID_ID; | |
1123 | else | |
1124 | cb->args[1]++; | |
a7b4f989 JK |
1125 | release_refcount: |
1126 | /* If there was an error or set is done, release set */ | |
1127 | if (ret || !cb->args[2]) { | |
1128 | pr_debug("release set %s\n", ip_set_list[index]->name); | |
2f9f28b2 | 1129 | ip_set_put_byindex(index); |
a7b4f989 | 1130 | } |
a7b4f989 JK |
1131 | out: |
1132 | if (nlh) { | |
1133 | nlmsg_end(skb, nlh); | |
1134 | pr_debug("nlmsg_len: %u\n", nlh->nlmsg_len); | |
1135 | dump_attrs(nlh); | |
1136 | } | |
1137 | ||
1138 | return ret < 0 ? ret : skb->len; | |
1139 | } | |
1140 | ||
1141 | static int | |
1142 | ip_set_dump(struct sock *ctnl, struct sk_buff *skb, | |
1143 | const struct nlmsghdr *nlh, | |
1144 | const struct nlattr * const attr[]) | |
1145 | { | |
1146 | if (unlikely(protocol_failed(attr))) | |
1147 | return -IPSET_ERR_PROTOCOL; | |
1148 | ||
1149 | return netlink_dump_start(ctnl, skb, nlh, | |
1150 | ip_set_dump_start, | |
c7ac8679 | 1151 | ip_set_dump_done, 0); |
a7b4f989 JK |
1152 | } |
1153 | ||
1154 | /* Add, del and test */ | |
1155 | ||
1156 | static const struct nla_policy ip_set_adt_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1157 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1158 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
1159 | .len = IPSET_MAXNAMELEN - 1 }, | |
1160 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, | |
1161 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, | |
1162 | [IPSET_ATTR_ADT] = { .type = NLA_NESTED }, | |
1163 | }; | |
1164 | ||
1165 | static int | |
5f52bc3c | 1166 | call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set, |
a7b4f989 JK |
1167 | struct nlattr *tb[], enum ipset_adt adt, |
1168 | u32 flags, bool use_lineno) | |
1169 | { | |
3d14b171 | 1170 | int ret; |
a7b4f989 | 1171 | u32 lineno = 0; |
3d14b171 | 1172 | bool eexist = flags & IPSET_FLAG_EXIST, retried = false; |
a7b4f989 JK |
1173 | |
1174 | do { | |
1175 | write_lock_bh(&set->lock); | |
3d14b171 | 1176 | ret = set->variant->uadt(set, tb, adt, &lineno, flags, retried); |
a7b4f989 | 1177 | write_unlock_bh(&set->lock); |
3d14b171 | 1178 | retried = true; |
a7b4f989 JK |
1179 | } while (ret == -EAGAIN && |
1180 | set->variant->resize && | |
3d14b171 | 1181 | (ret = set->variant->resize(set, retried)) == 0); |
a7b4f989 JK |
1182 | |
1183 | if (!ret || (ret == -IPSET_ERR_EXIST && eexist)) | |
1184 | return 0; | |
1185 | if (lineno && use_lineno) { | |
1186 | /* Error in restore/batch mode: send back lineno */ | |
5f52bc3c JK |
1187 | struct nlmsghdr *rep, *nlh = nlmsg_hdr(skb); |
1188 | struct sk_buff *skb2; | |
1189 | struct nlmsgerr *errmsg; | |
1190 | size_t payload = sizeof(*errmsg) + nlmsg_len(nlh); | |
a7b4f989 JK |
1191 | int min_len = NLMSG_SPACE(sizeof(struct nfgenmsg)); |
1192 | struct nlattr *cda[IPSET_ATTR_CMD_MAX+1]; | |
5f52bc3c | 1193 | struct nlattr *cmdattr; |
a7b4f989 JK |
1194 | u32 *errline; |
1195 | ||
5f52bc3c JK |
1196 | skb2 = nlmsg_new(payload, GFP_KERNEL); |
1197 | if (skb2 == NULL) | |
1198 | return -ENOMEM; | |
1199 | rep = __nlmsg_put(skb2, NETLINK_CB(skb).pid, | |
1200 | nlh->nlmsg_seq, NLMSG_ERROR, payload, 0); | |
1201 | errmsg = nlmsg_data(rep); | |
1202 | errmsg->error = ret; | |
1203 | memcpy(&errmsg->msg, nlh, nlh->nlmsg_len); | |
1204 | cmdattr = (void *)&errmsg->msg + min_len; | |
1205 | ||
a7b4f989 JK |
1206 | nla_parse(cda, IPSET_ATTR_CMD_MAX, |
1207 | cmdattr, nlh->nlmsg_len - min_len, | |
1208 | ip_set_adt_policy); | |
1209 | ||
1210 | errline = nla_data(cda[IPSET_ATTR_LINENO]); | |
1211 | ||
1212 | *errline = lineno; | |
5f52bc3c JK |
1213 | |
1214 | netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
1215 | /* Signal netlink not to send its ACK/errmsg. */ | |
1216 | return -EINTR; | |
a7b4f989 JK |
1217 | } |
1218 | ||
1219 | return ret; | |
1220 | } | |
1221 | ||
1222 | static int | |
1223 | ip_set_uadd(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_ADD, 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_ADD, |
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_udel(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 | const struct nlattr *nla; | |
1284 | u32 flags = flag_exist(nlh); | |
1285 | bool use_lineno; | |
1286 | int ret = 0; | |
1287 | ||
1288 | if (unlikely(protocol_failed(attr) || | |
1289 | attr[IPSET_ATTR_SETNAME] == NULL || | |
1290 | !((attr[IPSET_ATTR_DATA] != NULL) ^ | |
1291 | (attr[IPSET_ATTR_ADT] != NULL)) || | |
1292 | (attr[IPSET_ATTR_DATA] != NULL && | |
1293 | !flag_nested(attr[IPSET_ATTR_DATA])) || | |
1294 | (attr[IPSET_ATTR_ADT] != NULL && | |
1295 | (!flag_nested(attr[IPSET_ATTR_ADT]) || | |
1296 | attr[IPSET_ATTR_LINENO] == NULL)))) | |
1297 | return -IPSET_ERR_PROTOCOL; | |
1298 | ||
1299 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); | |
1300 | if (set == NULL) | |
1301 | return -ENOENT; | |
1302 | ||
1303 | use_lineno = !!attr[IPSET_ATTR_LINENO]; | |
1304 | if (attr[IPSET_ATTR_DATA]) { | |
8da560ce PM |
1305 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
1306 | attr[IPSET_ATTR_DATA], | |
1307 | set->type->adt_policy)) | |
a7b4f989 | 1308 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c JK |
1309 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, flags, |
1310 | use_lineno); | |
a7b4f989 JK |
1311 | } else { |
1312 | int nla_rem; | |
1313 | ||
1314 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { | |
1315 | memset(tb, 0, sizeof(*tb)); | |
1316 | if (nla_type(nla) != IPSET_ATTR_DATA || | |
1317 | !flag_nested(nla) || | |
8da560ce PM |
1318 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
1319 | set->type->adt_policy)) | |
a7b4f989 | 1320 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c | 1321 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, |
a7b4f989 JK |
1322 | flags, use_lineno); |
1323 | if (ret < 0) | |
1324 | return ret; | |
1325 | } | |
1326 | } | |
1327 | return ret; | |
1328 | } | |
1329 | ||
1330 | static int | |
1331 | ip_set_utest(struct sock *ctnl, struct sk_buff *skb, | |
1332 | const struct nlmsghdr *nlh, | |
1333 | const struct nlattr * const attr[]) | |
1334 | { | |
1335 | struct ip_set *set; | |
1336 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; | |
1337 | int ret = 0; | |
1338 | ||
1339 | if (unlikely(protocol_failed(attr) || | |
1340 | attr[IPSET_ATTR_SETNAME] == NULL || | |
1341 | attr[IPSET_ATTR_DATA] == NULL || | |
1342 | !flag_nested(attr[IPSET_ATTR_DATA]))) | |
1343 | return -IPSET_ERR_PROTOCOL; | |
1344 | ||
1345 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); | |
1346 | if (set == NULL) | |
1347 | return -ENOENT; | |
1348 | ||
8da560ce PM |
1349 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA], |
1350 | set->type->adt_policy)) | |
a7b4f989 JK |
1351 | return -IPSET_ERR_PROTOCOL; |
1352 | ||
1353 | read_lock_bh(&set->lock); | |
3d14b171 | 1354 | ret = set->variant->uadt(set, tb, IPSET_TEST, NULL, 0, 0); |
a7b4f989 JK |
1355 | read_unlock_bh(&set->lock); |
1356 | /* Userspace can't trigger element to be re-added */ | |
1357 | if (ret == -EAGAIN) | |
1358 | ret = 1; | |
1359 | ||
1360 | return ret < 0 ? ret : ret > 0 ? 0 : -IPSET_ERR_EXIST; | |
1361 | } | |
1362 | ||
1363 | /* Get headed data of a set */ | |
1364 | ||
1365 | static int | |
1366 | ip_set_header(struct sock *ctnl, struct sk_buff *skb, | |
1367 | const struct nlmsghdr *nlh, | |
1368 | const struct nlattr * const attr[]) | |
1369 | { | |
1370 | const struct ip_set *set; | |
1371 | struct sk_buff *skb2; | |
1372 | struct nlmsghdr *nlh2; | |
1373 | ip_set_id_t index; | |
1374 | int ret = 0; | |
1375 | ||
1376 | if (unlikely(protocol_failed(attr) || | |
1377 | attr[IPSET_ATTR_SETNAME] == NULL)) | |
1378 | return -IPSET_ERR_PROTOCOL; | |
1379 | ||
1380 | index = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME])); | |
1381 | if (index == IPSET_INVALID_ID) | |
1382 | return -ENOENT; | |
1383 | set = ip_set_list[index]; | |
1384 | ||
1385 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1386 | if (skb2 == NULL) | |
1387 | return -ENOMEM; | |
1388 | ||
1389 | nlh2 = start_msg(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, | |
1390 | IPSET_CMD_HEADER); | |
1391 | if (!nlh2) | |
1392 | goto nlmsg_failure; | |
1393 | NLA_PUT_U8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL); | |
1394 | NLA_PUT_STRING(skb2, IPSET_ATTR_SETNAME, set->name); | |
1395 | NLA_PUT_STRING(skb2, IPSET_ATTR_TYPENAME, set->type->name); | |
1396 | NLA_PUT_U8(skb2, IPSET_ATTR_FAMILY, set->family); | |
f1e00b39 | 1397 | NLA_PUT_U8(skb2, IPSET_ATTR_REVISION, set->revision); |
a7b4f989 JK |
1398 | nlmsg_end(skb2, nlh2); |
1399 | ||
1400 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
1401 | if (ret < 0) | |
1402 | return ret; | |
1403 | ||
1404 | return 0; | |
1405 | ||
1406 | nla_put_failure: | |
1407 | nlmsg_cancel(skb2, nlh2); | |
1408 | nlmsg_failure: | |
1409 | kfree_skb(skb2); | |
1410 | return -EMSGSIZE; | |
1411 | } | |
1412 | ||
1413 | /* Get type data */ | |
1414 | ||
1415 | static const struct nla_policy ip_set_type_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1416 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1417 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, | |
1418 | .len = IPSET_MAXNAMELEN - 1 }, | |
1419 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, | |
1420 | }; | |
1421 | ||
1422 | static int | |
1423 | ip_set_type(struct sock *ctnl, struct sk_buff *skb, | |
1424 | const struct nlmsghdr *nlh, | |
1425 | const struct nlattr * const attr[]) | |
1426 | { | |
1427 | struct sk_buff *skb2; | |
1428 | struct nlmsghdr *nlh2; | |
1429 | u8 family, min, max; | |
1430 | const char *typename; | |
1431 | int ret = 0; | |
1432 | ||
1433 | if (unlikely(protocol_failed(attr) || | |
1434 | attr[IPSET_ATTR_TYPENAME] == NULL || | |
1435 | attr[IPSET_ATTR_FAMILY] == NULL)) | |
1436 | return -IPSET_ERR_PROTOCOL; | |
1437 | ||
1438 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); | |
1439 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); | |
1440 | ret = find_set_type_minmax(typename, family, &min, &max); | |
1441 | if (ret) | |
1442 | return ret; | |
1443 | ||
1444 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1445 | if (skb2 == NULL) | |
1446 | return -ENOMEM; | |
1447 | ||
1448 | nlh2 = start_msg(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, | |
1449 | IPSET_CMD_TYPE); | |
1450 | if (!nlh2) | |
1451 | goto nlmsg_failure; | |
1452 | NLA_PUT_U8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL); | |
1453 | NLA_PUT_STRING(skb2, IPSET_ATTR_TYPENAME, typename); | |
1454 | NLA_PUT_U8(skb2, IPSET_ATTR_FAMILY, family); | |
1455 | NLA_PUT_U8(skb2, IPSET_ATTR_REVISION, max); | |
1456 | NLA_PUT_U8(skb2, IPSET_ATTR_REVISION_MIN, min); | |
1457 | nlmsg_end(skb2, nlh2); | |
1458 | ||
1459 | pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len); | |
1460 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
1461 | if (ret < 0) | |
1462 | return ret; | |
1463 | ||
1464 | return 0; | |
1465 | ||
1466 | nla_put_failure: | |
1467 | nlmsg_cancel(skb2, nlh2); | |
1468 | nlmsg_failure: | |
1469 | kfree_skb(skb2); | |
1470 | return -EMSGSIZE; | |
1471 | } | |
1472 | ||
1473 | /* Get protocol version */ | |
1474 | ||
1475 | static const struct nla_policy | |
1476 | ip_set_protocol_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1477 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1478 | }; | |
1479 | ||
1480 | static int | |
1481 | ip_set_protocol(struct sock *ctnl, struct sk_buff *skb, | |
1482 | const struct nlmsghdr *nlh, | |
1483 | const struct nlattr * const attr[]) | |
1484 | { | |
1485 | struct sk_buff *skb2; | |
1486 | struct nlmsghdr *nlh2; | |
1487 | int ret = 0; | |
1488 | ||
1489 | if (unlikely(attr[IPSET_ATTR_PROTOCOL] == NULL)) | |
1490 | return -IPSET_ERR_PROTOCOL; | |
1491 | ||
1492 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1493 | if (skb2 == NULL) | |
1494 | return -ENOMEM; | |
1495 | ||
1496 | nlh2 = start_msg(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, | |
1497 | IPSET_CMD_PROTOCOL); | |
1498 | if (!nlh2) | |
1499 | goto nlmsg_failure; | |
1500 | NLA_PUT_U8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL); | |
1501 | nlmsg_end(skb2, nlh2); | |
1502 | ||
1503 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); | |
1504 | if (ret < 0) | |
1505 | return ret; | |
1506 | ||
1507 | return 0; | |
1508 | ||
1509 | nla_put_failure: | |
1510 | nlmsg_cancel(skb2, nlh2); | |
1511 | nlmsg_failure: | |
1512 | kfree_skb(skb2); | |
1513 | return -EMSGSIZE; | |
1514 | } | |
1515 | ||
1516 | static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = { | |
1517 | [IPSET_CMD_CREATE] = { | |
1518 | .call = ip_set_create, | |
1519 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1520 | .policy = ip_set_create_policy, | |
1521 | }, | |
1522 | [IPSET_CMD_DESTROY] = { | |
1523 | .call = ip_set_destroy, | |
1524 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1525 | .policy = ip_set_setname_policy, | |
1526 | }, | |
1527 | [IPSET_CMD_FLUSH] = { | |
1528 | .call = ip_set_flush, | |
1529 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1530 | .policy = ip_set_setname_policy, | |
1531 | }, | |
1532 | [IPSET_CMD_RENAME] = { | |
1533 | .call = ip_set_rename, | |
1534 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1535 | .policy = ip_set_setname2_policy, | |
1536 | }, | |
1537 | [IPSET_CMD_SWAP] = { | |
1538 | .call = ip_set_swap, | |
1539 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1540 | .policy = ip_set_setname2_policy, | |
1541 | }, | |
1542 | [IPSET_CMD_LIST] = { | |
1543 | .call = ip_set_dump, | |
1544 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1545 | .policy = ip_set_setname_policy, | |
1546 | }, | |
1547 | [IPSET_CMD_SAVE] = { | |
1548 | .call = ip_set_dump, | |
1549 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1550 | .policy = ip_set_setname_policy, | |
1551 | }, | |
1552 | [IPSET_CMD_ADD] = { | |
1553 | .call = ip_set_uadd, | |
1554 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1555 | .policy = ip_set_adt_policy, | |
1556 | }, | |
1557 | [IPSET_CMD_DEL] = { | |
1558 | .call = ip_set_udel, | |
1559 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1560 | .policy = ip_set_adt_policy, | |
1561 | }, | |
1562 | [IPSET_CMD_TEST] = { | |
1563 | .call = ip_set_utest, | |
1564 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1565 | .policy = ip_set_adt_policy, | |
1566 | }, | |
1567 | [IPSET_CMD_HEADER] = { | |
1568 | .call = ip_set_header, | |
1569 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1570 | .policy = ip_set_setname_policy, | |
1571 | }, | |
1572 | [IPSET_CMD_TYPE] = { | |
1573 | .call = ip_set_type, | |
1574 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1575 | .policy = ip_set_type_policy, | |
1576 | }, | |
1577 | [IPSET_CMD_PROTOCOL] = { | |
1578 | .call = ip_set_protocol, | |
1579 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1580 | .policy = ip_set_protocol_policy, | |
1581 | }, | |
1582 | }; | |
1583 | ||
1584 | static struct nfnetlink_subsystem ip_set_netlink_subsys __read_mostly = { | |
1585 | .name = "ip_set", | |
1586 | .subsys_id = NFNL_SUBSYS_IPSET, | |
1587 | .cb_count = IPSET_MSG_MAX, | |
1588 | .cb = ip_set_netlink_subsys_cb, | |
1589 | }; | |
1590 | ||
1591 | /* Interface to iptables/ip6tables */ | |
1592 | ||
1593 | static int | |
1594 | ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len) | |
1595 | { | |
1596 | unsigned *op; | |
1597 | void *data; | |
1598 | int copylen = *len, ret = 0; | |
1599 | ||
1600 | if (!capable(CAP_NET_ADMIN)) | |
1601 | return -EPERM; | |
1602 | if (optval != SO_IP_SET) | |
1603 | return -EBADF; | |
1604 | if (*len < sizeof(unsigned)) | |
1605 | return -EINVAL; | |
1606 | ||
1607 | data = vmalloc(*len); | |
1608 | if (!data) | |
1609 | return -ENOMEM; | |
1610 | if (copy_from_user(data, user, *len) != 0) { | |
1611 | ret = -EFAULT; | |
1612 | goto done; | |
1613 | } | |
1614 | op = (unsigned *) data; | |
1615 | ||
1616 | if (*op < IP_SET_OP_VERSION) { | |
1617 | /* Check the version at the beginning of operations */ | |
1618 | struct ip_set_req_version *req_version = data; | |
1619 | if (req_version->version != IPSET_PROTOCOL) { | |
1620 | ret = -EPROTO; | |
1621 | goto done; | |
1622 | } | |
1623 | } | |
1624 | ||
1625 | switch (*op) { | |
1626 | case IP_SET_OP_VERSION: { | |
1627 | struct ip_set_req_version *req_version = data; | |
1628 | ||
1629 | if (*len != sizeof(struct ip_set_req_version)) { | |
1630 | ret = -EINVAL; | |
1631 | goto done; | |
1632 | } | |
1633 | ||
1634 | req_version->version = IPSET_PROTOCOL; | |
1635 | ret = copy_to_user(user, req_version, | |
1636 | sizeof(struct ip_set_req_version)); | |
1637 | goto done; | |
1638 | } | |
1639 | case IP_SET_OP_GET_BYNAME: { | |
1640 | struct ip_set_req_get_set *req_get = data; | |
1641 | ||
1642 | if (*len != sizeof(struct ip_set_req_get_set)) { | |
1643 | ret = -EINVAL; | |
1644 | goto done; | |
1645 | } | |
1646 | req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; | |
1647 | nfnl_lock(); | |
1648 | req_get->set.index = find_set_id(req_get->set.name); | |
1649 | nfnl_unlock(); | |
1650 | goto copy; | |
1651 | } | |
1652 | case IP_SET_OP_GET_BYINDEX: { | |
1653 | struct ip_set_req_get_set *req_get = data; | |
1654 | ||
1655 | if (*len != sizeof(struct ip_set_req_get_set) || | |
1656 | req_get->set.index >= ip_set_max) { | |
1657 | ret = -EINVAL; | |
1658 | goto done; | |
1659 | } | |
1660 | nfnl_lock(); | |
1661 | strncpy(req_get->set.name, | |
1662 | ip_set_list[req_get->set.index] | |
1663 | ? ip_set_list[req_get->set.index]->name : "", | |
1664 | IPSET_MAXNAMELEN); | |
1665 | nfnl_unlock(); | |
1666 | goto copy; | |
1667 | } | |
1668 | default: | |
1669 | ret = -EBADMSG; | |
1670 | goto done; | |
1671 | } /* end of switch(op) */ | |
1672 | ||
1673 | copy: | |
1674 | ret = copy_to_user(user, data, copylen); | |
1675 | ||
1676 | done: | |
1677 | vfree(data); | |
1678 | if (ret > 0) | |
1679 | ret = 0; | |
1680 | return ret; | |
1681 | } | |
1682 | ||
1683 | static struct nf_sockopt_ops so_set __read_mostly = { | |
1684 | .pf = PF_INET, | |
1685 | .get_optmin = SO_IP_SET, | |
1686 | .get_optmax = SO_IP_SET + 1, | |
1687 | .get = &ip_set_sockfn_get, | |
1688 | .owner = THIS_MODULE, | |
1689 | }; | |
1690 | ||
1691 | static int __init | |
1692 | ip_set_init(void) | |
1693 | { | |
1694 | int ret; | |
1695 | ||
1696 | if (max_sets) | |
1697 | ip_set_max = max_sets; | |
1698 | if (ip_set_max >= IPSET_INVALID_ID) | |
1699 | ip_set_max = IPSET_INVALID_ID - 1; | |
1700 | ||
1701 | ip_set_list = kzalloc(sizeof(struct ip_set *) * ip_set_max, | |
1702 | GFP_KERNEL); | |
1703 | if (!ip_set_list) { | |
1704 | pr_err("ip_set: Unable to create ip_set_list\n"); | |
1705 | return -ENOMEM; | |
1706 | } | |
1707 | ||
1708 | ret = nfnetlink_subsys_register(&ip_set_netlink_subsys); | |
1709 | if (ret != 0) { | |
1710 | pr_err("ip_set: cannot register with nfnetlink.\n"); | |
1711 | kfree(ip_set_list); | |
1712 | return ret; | |
1713 | } | |
1714 | ret = nf_register_sockopt(&so_set); | |
1715 | if (ret != 0) { | |
1716 | pr_err("SO_SET registry failed: %d\n", ret); | |
1717 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); | |
1718 | kfree(ip_set_list); | |
1719 | return ret; | |
1720 | } | |
1721 | ||
1722 | pr_notice("ip_set: protocol %u\n", IPSET_PROTOCOL); | |
1723 | return 0; | |
1724 | } | |
1725 | ||
1726 | static void __exit | |
1727 | ip_set_fini(void) | |
1728 | { | |
1729 | /* There can't be any existing set */ | |
1730 | nf_unregister_sockopt(&so_set); | |
1731 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); | |
1732 | kfree(ip_set_list); | |
1733 | pr_debug("these are the famous last words\n"); | |
1734 | } | |
1735 | ||
1736 | module_init(ip_set_init); | |
1737 | module_exit(ip_set_fini); |