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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> | |
a7b4f989 | 18 | #include <linux/rculist.h> |
a7b4f989 JK |
19 | #include <net/netlink.h> |
20 | ||
21 | #include <linux/netfilter.h> | |
b66554cf | 22 | #include <linux/netfilter/x_tables.h> |
a7b4f989 JK |
23 | #include <linux/netfilter/nfnetlink.h> |
24 | #include <linux/netfilter/ipset/ip_set.h> | |
25 | ||
26 | static LIST_HEAD(ip_set_type_list); /* all registered set types */ | |
27 | static DEFINE_MUTEX(ip_set_type_mutex); /* protects ip_set_type_list */ | |
2f9f28b2 | 28 | static DEFINE_RWLOCK(ip_set_ref_lock); /* protects the set refs */ |
a7b4f989 | 29 | |
9076aea7 | 30 | static struct ip_set * __rcu *ip_set_list; /* all individual sets */ |
a7b4f989 JK |
31 | static ip_set_id_t ip_set_max = CONFIG_IP_SET_MAX; /* max number of sets */ |
32 | ||
9076aea7 | 33 | #define IP_SET_INC 64 |
a7b4f989 JK |
34 | #define STREQ(a, b) (strncmp(a, b, IPSET_MAXNAMELEN) == 0) |
35 | ||
36 | static unsigned int max_sets; | |
37 | ||
38 | module_param(max_sets, int, 0600); | |
39 | MODULE_PARM_DESC(max_sets, "maximal number of sets"); | |
40 | MODULE_LICENSE("GPL"); | |
41 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); | |
42 | MODULE_DESCRIPTION("core IP set support"); | |
43 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_IPSET); | |
44 | ||
9076aea7 JK |
45 | /* When the nfnl mutex is held: */ |
46 | #define nfnl_dereference(p) \ | |
47 | rcu_dereference_protected(p, 1) | |
48 | #define nfnl_set(id) \ | |
49 | nfnl_dereference(ip_set_list)[id] | |
50 | ||
a7b4f989 JK |
51 | /* |
52 | * The set types are implemented in modules and registered set types | |
53 | * can be found in ip_set_type_list. Adding/deleting types is | |
54 | * serialized by ip_set_type_mutex. | |
55 | */ | |
56 | ||
57 | static inline void | |
58 | ip_set_type_lock(void) | |
59 | { | |
60 | mutex_lock(&ip_set_type_mutex); | |
61 | } | |
62 | ||
63 | static inline void | |
64 | ip_set_type_unlock(void) | |
65 | { | |
66 | mutex_unlock(&ip_set_type_mutex); | |
67 | } | |
68 | ||
69 | /* Register and deregister settype */ | |
70 | ||
71 | static struct ip_set_type * | |
72 | find_set_type(const char *name, u8 family, u8 revision) | |
73 | { | |
74 | struct ip_set_type *type; | |
75 | ||
76 | list_for_each_entry_rcu(type, &ip_set_type_list, list) | |
77 | if (STREQ(type->name, name) && | |
3ace95c0 JK |
78 | (type->family == family || |
79 | type->family == NFPROTO_UNSPEC) && | |
f1e00b39 JK |
80 | revision >= type->revision_min && |
81 | revision <= type->revision_max) | |
a7b4f989 JK |
82 | return type; |
83 | return NULL; | |
84 | } | |
85 | ||
86 | /* Unlock, try to load a set type module and lock again */ | |
088067f4 JK |
87 | static bool |
88 | load_settype(const char *name) | |
a7b4f989 | 89 | { |
c14b78e7 | 90 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
91 | pr_debug("try to load ip_set_%s\n", name); |
92 | if (request_module("ip_set_%s", name) < 0) { | |
93 | pr_warning("Can't find ip_set type %s\n", name); | |
c14b78e7 | 94 | nfnl_lock(NFNL_SUBSYS_IPSET); |
088067f4 | 95 | return false; |
a7b4f989 | 96 | } |
c14b78e7 | 97 | nfnl_lock(NFNL_SUBSYS_IPSET); |
088067f4 | 98 | return true; |
a7b4f989 JK |
99 | } |
100 | ||
101 | /* Find a set type and reference it */ | |
088067f4 JK |
102 | #define find_set_type_get(name, family, revision, found) \ |
103 | __find_set_type_get(name, family, revision, found, false) | |
104 | ||
a7b4f989 | 105 | static int |
088067f4 JK |
106 | __find_set_type_get(const char *name, u8 family, u8 revision, |
107 | struct ip_set_type **found, bool retry) | |
a7b4f989 | 108 | { |
5c1aba46 JK |
109 | struct ip_set_type *type; |
110 | int err; | |
111 | ||
088067f4 JK |
112 | if (retry && !load_settype(name)) |
113 | return -IPSET_ERR_FIND_TYPE; | |
114 | ||
a7b4f989 JK |
115 | rcu_read_lock(); |
116 | *found = find_set_type(name, family, revision); | |
117 | if (*found) { | |
5c1aba46 JK |
118 | err = !try_module_get((*found)->me) ? -EFAULT : 0; |
119 | goto unlock; | |
a7b4f989 | 120 | } |
088067f4 JK |
121 | /* Make sure the type is already loaded |
122 | * but we don't support the revision */ | |
5c1aba46 JK |
123 | list_for_each_entry_rcu(type, &ip_set_type_list, list) |
124 | if (STREQ(type->name, name)) { | |
125 | err = -IPSET_ERR_FIND_TYPE; | |
126 | goto unlock; | |
127 | } | |
a7b4f989 JK |
128 | rcu_read_unlock(); |
129 | ||
088067f4 JK |
130 | return retry ? -IPSET_ERR_FIND_TYPE : |
131 | __find_set_type_get(name, family, revision, found, true); | |
5c1aba46 JK |
132 | |
133 | unlock: | |
134 | rcu_read_unlock(); | |
135 | return err; | |
a7b4f989 JK |
136 | } |
137 | ||
138 | /* Find a given set type by name and family. | |
139 | * If we succeeded, the supported minimal and maximum revisions are | |
140 | * filled out. | |
141 | */ | |
088067f4 JK |
142 | #define find_set_type_minmax(name, family, min, max) \ |
143 | __find_set_type_minmax(name, family, min, max, false) | |
144 | ||
a7b4f989 | 145 | static int |
088067f4 JK |
146 | __find_set_type_minmax(const char *name, u8 family, u8 *min, u8 *max, |
147 | bool retry) | |
a7b4f989 JK |
148 | { |
149 | struct ip_set_type *type; | |
150 | bool found = false; | |
151 | ||
088067f4 JK |
152 | if (retry && !load_settype(name)) |
153 | return -IPSET_ERR_FIND_TYPE; | |
154 | ||
5c1aba46 | 155 | *min = 255; *max = 0; |
a7b4f989 JK |
156 | rcu_read_lock(); |
157 | list_for_each_entry_rcu(type, &ip_set_type_list, list) | |
158 | if (STREQ(type->name, name) && | |
3ace95c0 JK |
159 | (type->family == family || |
160 | type->family == NFPROTO_UNSPEC)) { | |
a7b4f989 | 161 | found = true; |
f1e00b39 JK |
162 | if (type->revision_min < *min) |
163 | *min = type->revision_min; | |
164 | if (type->revision_max > *max) | |
165 | *max = type->revision_max; | |
a7b4f989 JK |
166 | } |
167 | rcu_read_unlock(); | |
168 | if (found) | |
169 | return 0; | |
170 | ||
088067f4 JK |
171 | return retry ? -IPSET_ERR_FIND_TYPE : |
172 | __find_set_type_minmax(name, family, min, max, true); | |
a7b4f989 JK |
173 | } |
174 | ||
c15f1c83 JE |
175 | #define family_name(f) ((f) == NFPROTO_IPV4 ? "inet" : \ |
176 | (f) == NFPROTO_IPV6 ? "inet6" : "any") | |
a7b4f989 JK |
177 | |
178 | /* Register a set type structure. The type is identified by | |
179 | * the unique triple of name, family and revision. | |
180 | */ | |
181 | int | |
182 | ip_set_type_register(struct ip_set_type *type) | |
183 | { | |
184 | int ret = 0; | |
185 | ||
186 | if (type->protocol != IPSET_PROTOCOL) { | |
f1e00b39 | 187 | pr_warning("ip_set type %s, family %s, revision %u:%u uses " |
a7b4f989 JK |
188 | "wrong protocol version %u (want %u)\n", |
189 | type->name, family_name(type->family), | |
f1e00b39 JK |
190 | type->revision_min, type->revision_max, |
191 | type->protocol, IPSET_PROTOCOL); | |
a7b4f989 JK |
192 | return -EINVAL; |
193 | } | |
194 | ||
195 | ip_set_type_lock(); | |
f1e00b39 | 196 | if (find_set_type(type->name, type->family, type->revision_min)) { |
a7b4f989 | 197 | /* Duplicate! */ |
f1e00b39 | 198 | pr_warning("ip_set type %s, family %s with revision min %u " |
a7b4f989 | 199 | "already registered!\n", type->name, |
f1e00b39 | 200 | family_name(type->family), type->revision_min); |
a7b4f989 JK |
201 | ret = -EINVAL; |
202 | goto unlock; | |
203 | } | |
204 | list_add_rcu(&type->list, &ip_set_type_list); | |
f1e00b39 JK |
205 | pr_debug("type %s, family %s, revision %u:%u registered.\n", |
206 | type->name, family_name(type->family), | |
207 | type->revision_min, type->revision_max); | |
a7b4f989 JK |
208 | unlock: |
209 | ip_set_type_unlock(); | |
210 | return ret; | |
211 | } | |
212 | EXPORT_SYMBOL_GPL(ip_set_type_register); | |
213 | ||
214 | /* Unregister a set type. There's a small race with ip_set_create */ | |
215 | void | |
216 | ip_set_type_unregister(struct ip_set_type *type) | |
217 | { | |
218 | ip_set_type_lock(); | |
f1e00b39 JK |
219 | if (!find_set_type(type->name, type->family, type->revision_min)) { |
220 | pr_warning("ip_set type %s, family %s with revision min %u " | |
a7b4f989 | 221 | "not registered\n", type->name, |
f1e00b39 | 222 | family_name(type->family), type->revision_min); |
a7b4f989 JK |
223 | goto unlock; |
224 | } | |
225 | list_del_rcu(&type->list); | |
f1e00b39 JK |
226 | pr_debug("type %s, family %s with revision min %u unregistered.\n", |
227 | type->name, family_name(type->family), type->revision_min); | |
a7b4f989 JK |
228 | unlock: |
229 | ip_set_type_unlock(); | |
230 | ||
231 | synchronize_rcu(); | |
232 | } | |
233 | EXPORT_SYMBOL_GPL(ip_set_type_unregister); | |
234 | ||
235 | /* Utility functions */ | |
236 | void * | |
237 | ip_set_alloc(size_t size) | |
238 | { | |
239 | void *members = NULL; | |
240 | ||
241 | if (size < KMALLOC_MAX_SIZE) | |
242 | members = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); | |
243 | ||
244 | if (members) { | |
245 | pr_debug("%p: allocated with kmalloc\n", members); | |
246 | return members; | |
247 | } | |
248 | ||
249 | members = vzalloc(size); | |
250 | if (!members) | |
251 | return NULL; | |
252 | pr_debug("%p: allocated with vmalloc\n", members); | |
253 | ||
254 | return members; | |
255 | } | |
256 | EXPORT_SYMBOL_GPL(ip_set_alloc); | |
257 | ||
258 | void | |
259 | ip_set_free(void *members) | |
260 | { | |
261 | pr_debug("%p: free with %s\n", members, | |
262 | is_vmalloc_addr(members) ? "vfree" : "kfree"); | |
263 | if (is_vmalloc_addr(members)) | |
264 | vfree(members); | |
265 | else | |
266 | kfree(members); | |
267 | } | |
268 | EXPORT_SYMBOL_GPL(ip_set_free); | |
269 | ||
270 | static inline bool | |
271 | flag_nested(const struct nlattr *nla) | |
272 | { | |
273 | return nla->nla_type & NLA_F_NESTED; | |
274 | } | |
275 | ||
276 | static const struct nla_policy ipaddr_policy[IPSET_ATTR_IPADDR_MAX + 1] = { | |
277 | [IPSET_ATTR_IPADDR_IPV4] = { .type = NLA_U32 }, | |
278 | [IPSET_ATTR_IPADDR_IPV6] = { .type = NLA_BINARY, | |
279 | .len = sizeof(struct in6_addr) }, | |
280 | }; | |
281 | ||
282 | int | |
283 | ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr) | |
284 | { | |
285 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX+1]; | |
286 | ||
287 | if (unlikely(!flag_nested(nla))) | |
288 | return -IPSET_ERR_PROTOCOL; | |
8da560ce | 289 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy)) |
a7b4f989 JK |
290 | return -IPSET_ERR_PROTOCOL; |
291 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV4))) | |
292 | return -IPSET_ERR_PROTOCOL; | |
293 | ||
294 | *ipaddr = nla_get_be32(tb[IPSET_ATTR_IPADDR_IPV4]); | |
295 | return 0; | |
296 | } | |
297 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr4); | |
298 | ||
299 | int | |
300 | ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr) | |
301 | { | |
302 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX+1]; | |
303 | ||
304 | if (unlikely(!flag_nested(nla))) | |
305 | return -IPSET_ERR_PROTOCOL; | |
306 | ||
8da560ce | 307 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy)) |
a7b4f989 JK |
308 | return -IPSET_ERR_PROTOCOL; |
309 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV6))) | |
310 | return -IPSET_ERR_PROTOCOL; | |
311 | ||
312 | memcpy(ipaddr, nla_data(tb[IPSET_ATTR_IPADDR_IPV6]), | |
313 | sizeof(struct in6_addr)); | |
314 | return 0; | |
315 | } | |
316 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr6); | |
317 | ||
318 | /* | |
319 | * Creating/destroying/renaming/swapping affect the existence and | |
320 | * the properties of a set. All of these can be executed from userspace | |
321 | * only and serialized by the nfnl mutex indirectly from nfnetlink. | |
322 | * | |
323 | * Sets are identified by their index in ip_set_list and the index | |
324 | * is used by the external references (set/SET netfilter modules). | |
325 | * | |
326 | * The set behind an index may change by swapping only, from userspace. | |
327 | */ | |
328 | ||
329 | static inline void | |
9076aea7 | 330 | __ip_set_get(struct ip_set *set) |
a7b4f989 | 331 | { |
2f9f28b2 | 332 | write_lock_bh(&ip_set_ref_lock); |
9076aea7 | 333 | set->ref++; |
2f9f28b2 | 334 | write_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
335 | } |
336 | ||
337 | static inline void | |
9076aea7 | 338 | __ip_set_put(struct ip_set *set) |
a7b4f989 | 339 | { |
2f9f28b2 | 340 | write_lock_bh(&ip_set_ref_lock); |
9076aea7 JK |
341 | BUG_ON(set->ref == 0); |
342 | set->ref--; | |
2f9f28b2 | 343 | write_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
344 | } |
345 | ||
346 | /* | |
347 | * Add, del and test set entries from kernel. | |
348 | * | |
349 | * The set behind the index must exist and must be referenced | |
350 | * so it can't be destroyed (or changed) under our foot. | |
351 | */ | |
352 | ||
9076aea7 JK |
353 | static inline struct ip_set * |
354 | ip_set_rcu_get(ip_set_id_t index) | |
355 | { | |
356 | struct ip_set *set; | |
357 | ||
358 | rcu_read_lock(); | |
359 | /* ip_set_list itself needs to be protected */ | |
360 | set = rcu_dereference(ip_set_list)[index]; | |
361 | rcu_read_unlock(); | |
362 | ||
363 | return set; | |
364 | } | |
365 | ||
a7b4f989 JK |
366 | int |
367 | ip_set_test(ip_set_id_t index, const struct sk_buff *skb, | |
b66554cf | 368 | const struct xt_action_param *par, |
ac8cc925 | 369 | const struct ip_set_adt_opt *opt) |
a7b4f989 | 370 | { |
9076aea7 | 371 | struct ip_set *set = ip_set_rcu_get(index); |
a7b4f989 JK |
372 | int ret = 0; |
373 | ||
2f9f28b2 | 374 | BUG_ON(set == NULL); |
a7b4f989 JK |
375 | pr_debug("set %s, index %u\n", set->name, index); |
376 | ||
ac8cc925 | 377 | if (opt->dim < set->type->dimension || |
c15f1c83 | 378 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
a7b4f989 JK |
379 | return 0; |
380 | ||
381 | read_lock_bh(&set->lock); | |
b66554cf | 382 | ret = set->variant->kadt(set, skb, par, IPSET_TEST, opt); |
a7b4f989 JK |
383 | read_unlock_bh(&set->lock); |
384 | ||
385 | if (ret == -EAGAIN) { | |
386 | /* Type requests element to be completed */ | |
387 | pr_debug("element must be competed, ADD is triggered\n"); | |
388 | write_lock_bh(&set->lock); | |
b66554cf | 389 | set->variant->kadt(set, skb, par, IPSET_ADD, opt); |
a7b4f989 JK |
390 | write_unlock_bh(&set->lock); |
391 | ret = 1; | |
3e0304a5 JK |
392 | } else { |
393 | /* --return-nomatch: invert matched element */ | |
394 | if ((opt->flags & IPSET_RETURN_NOMATCH) && | |
395 | (set->type->features & IPSET_TYPE_NOMATCH) && | |
396 | (ret > 0 || ret == -ENOTEMPTY)) | |
397 | ret = -ret; | |
a7b4f989 JK |
398 | } |
399 | ||
400 | /* Convert error codes to nomatch */ | |
401 | return (ret < 0 ? 0 : ret); | |
402 | } | |
403 | EXPORT_SYMBOL_GPL(ip_set_test); | |
404 | ||
405 | int | |
406 | ip_set_add(ip_set_id_t index, const struct sk_buff *skb, | |
b66554cf | 407 | const struct xt_action_param *par, |
ac8cc925 | 408 | const struct ip_set_adt_opt *opt) |
a7b4f989 | 409 | { |
9076aea7 | 410 | struct ip_set *set = ip_set_rcu_get(index); |
a7b4f989 JK |
411 | int ret; |
412 | ||
2f9f28b2 | 413 | BUG_ON(set == NULL); |
a7b4f989 JK |
414 | pr_debug("set %s, index %u\n", set->name, index); |
415 | ||
ac8cc925 | 416 | if (opt->dim < set->type->dimension || |
c15f1c83 | 417 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
a7b4f989 JK |
418 | return 0; |
419 | ||
420 | write_lock_bh(&set->lock); | |
b66554cf | 421 | ret = set->variant->kadt(set, skb, par, IPSET_ADD, opt); |
a7b4f989 JK |
422 | write_unlock_bh(&set->lock); |
423 | ||
424 | return ret; | |
425 | } | |
426 | EXPORT_SYMBOL_GPL(ip_set_add); | |
427 | ||
428 | int | |
429 | ip_set_del(ip_set_id_t index, const struct sk_buff *skb, | |
b66554cf | 430 | const struct xt_action_param *par, |
ac8cc925 | 431 | const struct ip_set_adt_opt *opt) |
a7b4f989 | 432 | { |
9076aea7 | 433 | struct ip_set *set = ip_set_rcu_get(index); |
a7b4f989 JK |
434 | int ret = 0; |
435 | ||
2f9f28b2 | 436 | BUG_ON(set == NULL); |
a7b4f989 JK |
437 | pr_debug("set %s, index %u\n", set->name, index); |
438 | ||
ac8cc925 | 439 | if (opt->dim < set->type->dimension || |
c15f1c83 | 440 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
a7b4f989 JK |
441 | return 0; |
442 | ||
443 | write_lock_bh(&set->lock); | |
b66554cf | 444 | ret = set->variant->kadt(set, skb, par, IPSET_DEL, opt); |
a7b4f989 JK |
445 | write_unlock_bh(&set->lock); |
446 | ||
447 | return ret; | |
448 | } | |
449 | EXPORT_SYMBOL_GPL(ip_set_del); | |
450 | ||
451 | /* | |
452 | * Find set by name, reference it once. The reference makes sure the | |
453 | * thing pointed to, does not go away under our feet. | |
454 | * | |
a7b4f989 JK |
455 | */ |
456 | ip_set_id_t | |
457 | ip_set_get_byname(const char *name, struct ip_set **set) | |
458 | { | |
459 | ip_set_id_t i, index = IPSET_INVALID_ID; | |
460 | struct ip_set *s; | |
461 | ||
9076aea7 | 462 | rcu_read_lock(); |
a7b4f989 | 463 | for (i = 0; i < ip_set_max; i++) { |
9076aea7 | 464 | s = rcu_dereference(ip_set_list)[i]; |
a7b4f989 | 465 | if (s != NULL && STREQ(s->name, name)) { |
9076aea7 | 466 | __ip_set_get(s); |
a7b4f989 JK |
467 | index = i; |
468 | *set = s; | |
9076aea7 | 469 | break; |
a7b4f989 JK |
470 | } |
471 | } | |
9076aea7 | 472 | rcu_read_unlock(); |
a7b4f989 JK |
473 | |
474 | return index; | |
475 | } | |
476 | EXPORT_SYMBOL_GPL(ip_set_get_byname); | |
477 | ||
478 | /* | |
479 | * If the given set pointer points to a valid set, decrement | |
480 | * reference count by 1. The caller shall not assume the index | |
481 | * to be valid, after calling this function. | |
482 | * | |
a7b4f989 JK |
483 | */ |
484 | void | |
485 | ip_set_put_byindex(ip_set_id_t index) | |
486 | { | |
9076aea7 JK |
487 | struct ip_set *set; |
488 | ||
489 | rcu_read_lock(); | |
490 | set = rcu_dereference(ip_set_list)[index]; | |
491 | if (set != NULL) | |
492 | __ip_set_put(set); | |
493 | rcu_read_unlock(); | |
a7b4f989 JK |
494 | } |
495 | EXPORT_SYMBOL_GPL(ip_set_put_byindex); | |
496 | ||
497 | /* | |
498 | * Get the name of a set behind a set index. | |
499 | * We assume the set is referenced, so it does exist and | |
500 | * can't be destroyed. The set cannot be renamed due to | |
501 | * the referencing either. | |
502 | * | |
a7b4f989 JK |
503 | */ |
504 | const char * | |
505 | ip_set_name_byindex(ip_set_id_t index) | |
506 | { | |
9076aea7 | 507 | const struct ip_set *set = ip_set_rcu_get(index); |
a7b4f989 JK |
508 | |
509 | BUG_ON(set == NULL); | |
2f9f28b2 | 510 | BUG_ON(set->ref == 0); |
a7b4f989 JK |
511 | |
512 | /* Referenced, so it's safe */ | |
513 | return set->name; | |
514 | } | |
515 | EXPORT_SYMBOL_GPL(ip_set_name_byindex); | |
516 | ||
517 | /* | |
518 | * Routines to call by external subsystems, which do not | |
519 | * call nfnl_lock for us. | |
520 | */ | |
521 | ||
522 | /* | |
523 | * Find set by name, reference it once. The reference makes sure the | |
524 | * thing pointed to, does not go away under our feet. | |
525 | * | |
526 | * The nfnl mutex is used in the function. | |
527 | */ | |
528 | ip_set_id_t | |
529 | ip_set_nfnl_get(const char *name) | |
530 | { | |
9076aea7 | 531 | ip_set_id_t i, index = IPSET_INVALID_ID; |
a7b4f989 | 532 | struct ip_set *s; |
a7b4f989 | 533 | |
c14b78e7 | 534 | nfnl_lock(NFNL_SUBSYS_IPSET); |
9076aea7 JK |
535 | for (i = 0; i < ip_set_max; i++) { |
536 | s = nfnl_set(i); | |
537 | if (s != NULL && STREQ(s->name, name)) { | |
538 | __ip_set_get(s); | |
539 | index = i; | |
540 | break; | |
541 | } | |
542 | } | |
c14b78e7 | 543 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
544 | |
545 | return index; | |
546 | } | |
547 | EXPORT_SYMBOL_GPL(ip_set_nfnl_get); | |
548 | ||
549 | /* | |
550 | * Find set by index, reference it once. The reference makes sure the | |
551 | * thing pointed to, does not go away under our feet. | |
552 | * | |
553 | * The nfnl mutex is used in the function. | |
554 | */ | |
555 | ip_set_id_t | |
556 | ip_set_nfnl_get_byindex(ip_set_id_t index) | |
557 | { | |
9076aea7 JK |
558 | struct ip_set *set; |
559 | ||
a7b4f989 JK |
560 | if (index > ip_set_max) |
561 | return IPSET_INVALID_ID; | |
562 | ||
c14b78e7 | 563 | nfnl_lock(NFNL_SUBSYS_IPSET); |
9076aea7 JK |
564 | set = nfnl_set(index); |
565 | if (set) | |
566 | __ip_set_get(set); | |
a7b4f989 JK |
567 | else |
568 | index = IPSET_INVALID_ID; | |
c14b78e7 | 569 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
570 | |
571 | return index; | |
572 | } | |
573 | EXPORT_SYMBOL_GPL(ip_set_nfnl_get_byindex); | |
574 | ||
575 | /* | |
576 | * If the given set pointer points to a valid set, decrement | |
577 | * reference count by 1. The caller shall not assume the index | |
578 | * to be valid, after calling this function. | |
579 | * | |
580 | * The nfnl mutex is used in the function. | |
581 | */ | |
582 | void | |
583 | ip_set_nfnl_put(ip_set_id_t index) | |
584 | { | |
9076aea7 | 585 | struct ip_set *set; |
c14b78e7 | 586 | nfnl_lock(NFNL_SUBSYS_IPSET); |
9076aea7 JK |
587 | set = nfnl_set(index); |
588 | if (set != NULL) | |
589 | __ip_set_put(set); | |
c14b78e7 | 590 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
591 | } |
592 | EXPORT_SYMBOL_GPL(ip_set_nfnl_put); | |
593 | ||
594 | /* | |
595 | * Communication protocol with userspace over netlink. | |
596 | * | |
2f9f28b2 | 597 | * The commands are serialized by the nfnl mutex. |
a7b4f989 JK |
598 | */ |
599 | ||
600 | static inline bool | |
601 | protocol_failed(const struct nlattr * const tb[]) | |
602 | { | |
603 | return !tb[IPSET_ATTR_PROTOCOL] || | |
604 | nla_get_u8(tb[IPSET_ATTR_PROTOCOL]) != IPSET_PROTOCOL; | |
605 | } | |
606 | ||
607 | static inline u32 | |
608 | flag_exist(const struct nlmsghdr *nlh) | |
609 | { | |
610 | return nlh->nlmsg_flags & NLM_F_EXCL ? 0 : IPSET_FLAG_EXIST; | |
611 | } | |
612 | ||
613 | static struct nlmsghdr * | |
15e47304 | 614 | start_msg(struct sk_buff *skb, u32 portid, u32 seq, unsigned int flags, |
a7b4f989 JK |
615 | enum ipset_cmd cmd) |
616 | { | |
617 | struct nlmsghdr *nlh; | |
618 | struct nfgenmsg *nfmsg; | |
619 | ||
15e47304 | 620 | nlh = nlmsg_put(skb, portid, seq, cmd | (NFNL_SUBSYS_IPSET << 8), |
a7b4f989 JK |
621 | sizeof(*nfmsg), flags); |
622 | if (nlh == NULL) | |
623 | return NULL; | |
624 | ||
625 | nfmsg = nlmsg_data(nlh); | |
c15f1c83 | 626 | nfmsg->nfgen_family = NFPROTO_IPV4; |
a7b4f989 JK |
627 | nfmsg->version = NFNETLINK_V0; |
628 | nfmsg->res_id = 0; | |
629 | ||
630 | return nlh; | |
631 | } | |
632 | ||
633 | /* Create a set */ | |
634 | ||
635 | static const struct nla_policy ip_set_create_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
636 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
637 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
638 | .len = IPSET_MAXNAMELEN - 1 }, | |
639 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, | |
640 | .len = IPSET_MAXNAMELEN - 1}, | |
641 | [IPSET_ATTR_REVISION] = { .type = NLA_U8 }, | |
642 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, | |
643 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, | |
644 | }; | |
645 | ||
9076aea7 JK |
646 | static struct ip_set * |
647 | find_set_and_id(const char *name, ip_set_id_t *id) | |
a7b4f989 | 648 | { |
9076aea7 JK |
649 | struct ip_set *set = NULL; |
650 | ip_set_id_t i; | |
a7b4f989 | 651 | |
9076aea7 JK |
652 | *id = IPSET_INVALID_ID; |
653 | for (i = 0; i < ip_set_max; i++) { | |
654 | set = nfnl_set(i); | |
655 | if (set != NULL && STREQ(set->name, name)) { | |
656 | *id = i; | |
657 | break; | |
658 | } | |
a7b4f989 | 659 | } |
9076aea7 | 660 | return (*id == IPSET_INVALID_ID ? NULL : set); |
a7b4f989 JK |
661 | } |
662 | ||
663 | static inline struct ip_set * | |
664 | find_set(const char *name) | |
665 | { | |
9076aea7 | 666 | ip_set_id_t id; |
a7b4f989 | 667 | |
9076aea7 | 668 | return find_set_and_id(name, &id); |
a7b4f989 JK |
669 | } |
670 | ||
671 | static int | |
672 | find_free_id(const char *name, ip_set_id_t *index, struct ip_set **set) | |
673 | { | |
9076aea7 | 674 | struct ip_set *s; |
a7b4f989 JK |
675 | ip_set_id_t i; |
676 | ||
677 | *index = IPSET_INVALID_ID; | |
678 | for (i = 0; i < ip_set_max; i++) { | |
9076aea7 JK |
679 | s = nfnl_set(i); |
680 | if (s == NULL) { | |
a7b4f989 JK |
681 | if (*index == IPSET_INVALID_ID) |
682 | *index = i; | |
9076aea7 | 683 | } else if (STREQ(name, s->name)) { |
a7b4f989 | 684 | /* Name clash */ |
9076aea7 | 685 | *set = s; |
a7b4f989 JK |
686 | return -EEXIST; |
687 | } | |
688 | } | |
689 | if (*index == IPSET_INVALID_ID) | |
690 | /* No free slot remained */ | |
691 | return -IPSET_ERR_MAX_SETS; | |
692 | return 0; | |
693 | } | |
694 | ||
d31f4d44 TB |
695 | static int |
696 | ip_set_none(struct sock *ctnl, struct sk_buff *skb, | |
697 | const struct nlmsghdr *nlh, | |
698 | const struct nlattr * const attr[]) | |
699 | { | |
700 | return -EOPNOTSUPP; | |
701 | } | |
702 | ||
a7b4f989 JK |
703 | static int |
704 | ip_set_create(struct sock *ctnl, struct sk_buff *skb, | |
705 | const struct nlmsghdr *nlh, | |
706 | const struct nlattr * const attr[]) | |
707 | { | |
9846ada1 | 708 | struct ip_set *set, *clash = NULL; |
a7b4f989 JK |
709 | ip_set_id_t index = IPSET_INVALID_ID; |
710 | struct nlattr *tb[IPSET_ATTR_CREATE_MAX+1] = {}; | |
711 | const char *name, *typename; | |
712 | u8 family, revision; | |
713 | u32 flags = flag_exist(nlh); | |
714 | int ret = 0; | |
715 | ||
716 | if (unlikely(protocol_failed(attr) || | |
717 | attr[IPSET_ATTR_SETNAME] == NULL || | |
718 | attr[IPSET_ATTR_TYPENAME] == NULL || | |
719 | attr[IPSET_ATTR_REVISION] == NULL || | |
720 | attr[IPSET_ATTR_FAMILY] == NULL || | |
721 | (attr[IPSET_ATTR_DATA] != NULL && | |
722 | !flag_nested(attr[IPSET_ATTR_DATA])))) | |
723 | return -IPSET_ERR_PROTOCOL; | |
724 | ||
725 | name = nla_data(attr[IPSET_ATTR_SETNAME]); | |
726 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); | |
727 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); | |
728 | revision = nla_get_u8(attr[IPSET_ATTR_REVISION]); | |
729 | pr_debug("setname: %s, typename: %s, family: %s, revision: %u\n", | |
730 | name, typename, family_name(family), revision); | |
731 | ||
732 | /* | |
733 | * First, and without any locks, allocate and initialize | |
734 | * a normal base set structure. | |
735 | */ | |
736 | set = kzalloc(sizeof(struct ip_set), GFP_KERNEL); | |
737 | if (!set) | |
738 | return -ENOMEM; | |
739 | rwlock_init(&set->lock); | |
740 | strlcpy(set->name, name, IPSET_MAXNAMELEN); | |
a7b4f989 | 741 | set->family = family; |
f1e00b39 | 742 | set->revision = revision; |
a7b4f989 JK |
743 | |
744 | /* | |
745 | * Next, check that we know the type, and take | |
746 | * a reference on the type, to make sure it stays available | |
747 | * while constructing our new set. | |
748 | * | |
749 | * After referencing the type, we try to create the type | |
750 | * specific part of the set without holding any locks. | |
751 | */ | |
752 | ret = find_set_type_get(typename, family, revision, &(set->type)); | |
753 | if (ret) | |
754 | goto out; | |
755 | ||
756 | /* | |
757 | * Without holding any locks, create private part. | |
758 | */ | |
759 | if (attr[IPSET_ATTR_DATA] && | |
8da560ce PM |
760 | nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA], |
761 | set->type->create_policy)) { | |
15b4d93f JK |
762 | ret = -IPSET_ERR_PROTOCOL; |
763 | goto put_out; | |
a7b4f989 JK |
764 | } |
765 | ||
766 | ret = set->type->create(set, tb, flags); | |
767 | if (ret != 0) | |
768 | goto put_out; | |
769 | ||
770 | /* BTW, ret==0 here. */ | |
771 | ||
772 | /* | |
773 | * Here, we have a valid, constructed set and we are protected | |
2f9f28b2 JK |
774 | * by the nfnl mutex. Find the first free index in ip_set_list |
775 | * and check clashing. | |
a7b4f989 | 776 | */ |
3ace95c0 | 777 | ret = find_free_id(set->name, &index, &clash); |
9076aea7 | 778 | if (ret == -EEXIST) { |
a7b4f989 | 779 | /* If this is the same set and requested, ignore error */ |
9076aea7 | 780 | if ((flags & IPSET_FLAG_EXIST) && |
a7b4f989 JK |
781 | STREQ(set->type->name, clash->type->name) && |
782 | set->type->family == clash->type->family && | |
f1e00b39 JK |
783 | set->type->revision_min == clash->type->revision_min && |
784 | set->type->revision_max == clash->type->revision_max && | |
a7b4f989 JK |
785 | set->variant->same_set(set, clash)) |
786 | ret = 0; | |
787 | goto cleanup; | |
9076aea7 JK |
788 | } else if (ret == -IPSET_ERR_MAX_SETS) { |
789 | struct ip_set **list, **tmp; | |
790 | ip_set_id_t i = ip_set_max + IP_SET_INC; | |
791 | ||
792 | if (i < ip_set_max || i == IPSET_INVALID_ID) | |
793 | /* Wraparound */ | |
794 | goto cleanup; | |
795 | ||
796 | list = kzalloc(sizeof(struct ip_set *) * i, GFP_KERNEL); | |
797 | if (!list) | |
798 | goto cleanup; | |
799 | /* nfnl mutex is held, both lists are valid */ | |
800 | tmp = nfnl_dereference(ip_set_list); | |
801 | memcpy(list, tmp, sizeof(struct ip_set *) * ip_set_max); | |
802 | rcu_assign_pointer(ip_set_list, list); | |
803 | /* Make sure all current packets have passed through */ | |
804 | synchronize_net(); | |
805 | /* Use new list */ | |
806 | index = ip_set_max; | |
807 | ip_set_max = i; | |
808 | kfree(tmp); | |
809 | ret = 0; | |
810 | } else if (ret) | |
811 | goto cleanup; | |
a7b4f989 JK |
812 | |
813 | /* | |
814 | * Finally! Add our shiny new set to the list, and be done. | |
815 | */ | |
816 | pr_debug("create: '%s' created with index %u!\n", set->name, index); | |
9076aea7 | 817 | nfnl_set(index) = set; |
a7b4f989 JK |
818 | |
819 | return ret; | |
820 | ||
821 | cleanup: | |
822 | set->variant->destroy(set); | |
823 | put_out: | |
824 | module_put(set->type->me); | |
825 | out: | |
826 | kfree(set); | |
827 | return ret; | |
828 | } | |
829 | ||
830 | /* Destroy sets */ | |
831 | ||
832 | static const struct nla_policy | |
833 | ip_set_setname_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
834 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
835 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
836 | .len = IPSET_MAXNAMELEN - 1 }, | |
837 | }; | |
838 | ||
839 | static void | |
840 | ip_set_destroy_set(ip_set_id_t index) | |
841 | { | |
9076aea7 | 842 | struct ip_set *set = nfnl_set(index); |
a7b4f989 JK |
843 | |
844 | pr_debug("set: %s\n", set->name); | |
9076aea7 | 845 | nfnl_set(index) = NULL; |
a7b4f989 JK |
846 | |
847 | /* Must call it without holding any lock */ | |
848 | set->variant->destroy(set); | |
849 | module_put(set->type->me); | |
850 | kfree(set); | |
851 | } | |
852 | ||
853 | static int | |
854 | ip_set_destroy(struct sock *ctnl, struct sk_buff *skb, | |
855 | const struct nlmsghdr *nlh, | |
856 | const struct nlattr * const attr[]) | |
857 | { | |
9076aea7 | 858 | struct ip_set *s; |
a7b4f989 | 859 | ip_set_id_t i; |
2f9f28b2 | 860 | int ret = 0; |
a7b4f989 JK |
861 | |
862 | if (unlikely(protocol_failed(attr))) | |
863 | return -IPSET_ERR_PROTOCOL; | |
864 | ||
2f9f28b2 JK |
865 | /* Commands are serialized and references are |
866 | * protected by the ip_set_ref_lock. | |
867 | * External systems (i.e. xt_set) must call | |
868 | * ip_set_put|get_nfnl_* functions, that way we | |
869 | * can safely check references here. | |
870 | * | |
871 | * list:set timer can only decrement the reference | |
872 | * counter, so if it's already zero, we can proceed | |
873 | * without holding the lock. | |
874 | */ | |
875 | read_lock_bh(&ip_set_ref_lock); | |
a7b4f989 JK |
876 | if (!attr[IPSET_ATTR_SETNAME]) { |
877 | for (i = 0; i < ip_set_max; i++) { | |
9076aea7 JK |
878 | s = nfnl_set(i); |
879 | if (s != NULL && s->ref) { | |
9d883232 | 880 | ret = -IPSET_ERR_BUSY; |
2f9f28b2 JK |
881 | goto out; |
882 | } | |
a7b4f989 | 883 | } |
2f9f28b2 | 884 | read_unlock_bh(&ip_set_ref_lock); |
a7b4f989 | 885 | for (i = 0; i < ip_set_max; i++) { |
9076aea7 JK |
886 | s = nfnl_set(i); |
887 | if (s != NULL) | |
a7b4f989 JK |
888 | ip_set_destroy_set(i); |
889 | } | |
890 | } else { | |
9076aea7 JK |
891 | s = find_set_and_id(nla_data(attr[IPSET_ATTR_SETNAME]), &i); |
892 | if (s == NULL) { | |
2f9f28b2 JK |
893 | ret = -ENOENT; |
894 | goto out; | |
9076aea7 | 895 | } else if (s->ref) { |
2f9f28b2 JK |
896 | ret = -IPSET_ERR_BUSY; |
897 | goto out; | |
898 | } | |
899 | read_unlock_bh(&ip_set_ref_lock); | |
a7b4f989 JK |
900 | |
901 | ip_set_destroy_set(i); | |
902 | } | |
903 | return 0; | |
2f9f28b2 JK |
904 | out: |
905 | read_unlock_bh(&ip_set_ref_lock); | |
906 | return ret; | |
a7b4f989 JK |
907 | } |
908 | ||
909 | /* Flush sets */ | |
910 | ||
911 | static void | |
912 | ip_set_flush_set(struct ip_set *set) | |
913 | { | |
914 | pr_debug("set: %s\n", set->name); | |
915 | ||
916 | write_lock_bh(&set->lock); | |
917 | set->variant->flush(set); | |
918 | write_unlock_bh(&set->lock); | |
919 | } | |
920 | ||
921 | static int | |
922 | ip_set_flush(struct sock *ctnl, struct sk_buff *skb, | |
923 | const struct nlmsghdr *nlh, | |
924 | const struct nlattr * const attr[]) | |
925 | { | |
9076aea7 | 926 | struct ip_set *s; |
a7b4f989 JK |
927 | ip_set_id_t i; |
928 | ||
929 | if (unlikely(protocol_failed(attr))) | |
9184a9cb | 930 | return -IPSET_ERR_PROTOCOL; |
a7b4f989 JK |
931 | |
932 | if (!attr[IPSET_ATTR_SETNAME]) { | |
9076aea7 JK |
933 | for (i = 0; i < ip_set_max; i++) { |
934 | s = nfnl_set(i); | |
935 | if (s != NULL) | |
936 | ip_set_flush_set(s); | |
937 | } | |
a7b4f989 | 938 | } else { |
9076aea7 JK |
939 | s = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); |
940 | if (s == NULL) | |
a7b4f989 JK |
941 | return -ENOENT; |
942 | ||
9076aea7 | 943 | ip_set_flush_set(s); |
a7b4f989 JK |
944 | } |
945 | ||
946 | return 0; | |
947 | } | |
948 | ||
949 | /* Rename a set */ | |
950 | ||
951 | static const struct nla_policy | |
952 | ip_set_setname2_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
953 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
954 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
955 | .len = IPSET_MAXNAMELEN - 1 }, | |
956 | [IPSET_ATTR_SETNAME2] = { .type = NLA_NUL_STRING, | |
957 | .len = IPSET_MAXNAMELEN - 1 }, | |
958 | }; | |
959 | ||
960 | static int | |
961 | ip_set_rename(struct sock *ctnl, struct sk_buff *skb, | |
962 | const struct nlmsghdr *nlh, | |
963 | const struct nlattr * const attr[]) | |
964 | { | |
9076aea7 | 965 | struct ip_set *set, *s; |
a7b4f989 JK |
966 | const char *name2; |
967 | ip_set_id_t i; | |
2f9f28b2 | 968 | int ret = 0; |
a7b4f989 JK |
969 | |
970 | if (unlikely(protocol_failed(attr) || | |
971 | attr[IPSET_ATTR_SETNAME] == NULL || | |
972 | attr[IPSET_ATTR_SETNAME2] == NULL)) | |
973 | return -IPSET_ERR_PROTOCOL; | |
974 | ||
975 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); | |
976 | if (set == NULL) | |
977 | return -ENOENT; | |
2f9f28b2 JK |
978 | |
979 | read_lock_bh(&ip_set_ref_lock); | |
980 | if (set->ref != 0) { | |
981 | ret = -IPSET_ERR_REFERENCED; | |
982 | goto out; | |
983 | } | |
a7b4f989 JK |
984 | |
985 | name2 = nla_data(attr[IPSET_ATTR_SETNAME2]); | |
986 | for (i = 0; i < ip_set_max; i++) { | |
9076aea7 JK |
987 | s = nfnl_set(i); |
988 | if (s != NULL && STREQ(s->name, name2)) { | |
2f9f28b2 JK |
989 | ret = -IPSET_ERR_EXIST_SETNAME2; |
990 | goto out; | |
991 | } | |
a7b4f989 JK |
992 | } |
993 | strncpy(set->name, name2, IPSET_MAXNAMELEN); | |
994 | ||
2f9f28b2 JK |
995 | out: |
996 | read_unlock_bh(&ip_set_ref_lock); | |
997 | return ret; | |
a7b4f989 JK |
998 | } |
999 | ||
1000 | /* Swap two sets so that name/index points to the other. | |
1001 | * References and set names are also swapped. | |
1002 | * | |
2f9f28b2 JK |
1003 | * The commands are serialized by the nfnl mutex and references are |
1004 | * protected by the ip_set_ref_lock. The kernel interfaces | |
a7b4f989 JK |
1005 | * do not hold the mutex but the pointer settings are atomic |
1006 | * so the ip_set_list always contains valid pointers to the sets. | |
1007 | */ | |
1008 | ||
1009 | static int | |
1010 | ip_set_swap(struct sock *ctnl, struct sk_buff *skb, | |
1011 | const struct nlmsghdr *nlh, | |
1012 | const struct nlattr * const attr[]) | |
1013 | { | |
1014 | struct ip_set *from, *to; | |
1015 | ip_set_id_t from_id, to_id; | |
1016 | char from_name[IPSET_MAXNAMELEN]; | |
a7b4f989 JK |
1017 | |
1018 | if (unlikely(protocol_failed(attr) || | |
1019 | attr[IPSET_ATTR_SETNAME] == NULL || | |
1020 | attr[IPSET_ATTR_SETNAME2] == NULL)) | |
1021 | return -IPSET_ERR_PROTOCOL; | |
1022 | ||
9076aea7 JK |
1023 | from = find_set_and_id(nla_data(attr[IPSET_ATTR_SETNAME]), &from_id); |
1024 | if (from == NULL) | |
a7b4f989 JK |
1025 | return -ENOENT; |
1026 | ||
9076aea7 JK |
1027 | to = find_set_and_id(nla_data(attr[IPSET_ATTR_SETNAME2]), &to_id); |
1028 | if (to == NULL) | |
a7b4f989 JK |
1029 | return -IPSET_ERR_EXIST_SETNAME2; |
1030 | ||
a7b4f989 | 1031 | /* Features must not change. |
25985edc | 1032 | * Not an artificial restriction anymore, as we must prevent |
a7b4f989 JK |
1033 | * possible loops created by swapping in setlist type of sets. */ |
1034 | if (!(from->type->features == to->type->features && | |
1035 | from->type->family == to->type->family)) | |
1036 | return -IPSET_ERR_TYPE_MISMATCH; | |
1037 | ||
a7b4f989 | 1038 | strncpy(from_name, from->name, IPSET_MAXNAMELEN); |
a7b4f989 | 1039 | strncpy(from->name, to->name, IPSET_MAXNAMELEN); |
a7b4f989 | 1040 | strncpy(to->name, from_name, IPSET_MAXNAMELEN); |
a7b4f989 | 1041 | |
2f9f28b2 JK |
1042 | write_lock_bh(&ip_set_ref_lock); |
1043 | swap(from->ref, to->ref); | |
9076aea7 JK |
1044 | nfnl_set(from_id) = to; |
1045 | nfnl_set(to_id) = from; | |
2f9f28b2 | 1046 | write_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
1047 | |
1048 | return 0; | |
1049 | } | |
1050 | ||
1051 | /* List/save set data */ | |
1052 | ||
c1e2e043 JK |
1053 | #define DUMP_INIT 0 |
1054 | #define DUMP_ALL 1 | |
1055 | #define DUMP_ONE 2 | |
1056 | #define DUMP_LAST 3 | |
1057 | ||
1058 | #define DUMP_TYPE(arg) (((u32)(arg)) & 0x0000FFFF) | |
1059 | #define DUMP_FLAGS(arg) (((u32)(arg)) >> 16) | |
a7b4f989 JK |
1060 | |
1061 | static int | |
1062 | ip_set_dump_done(struct netlink_callback *cb) | |
1063 | { | |
1064 | if (cb->args[2]) { | |
9076aea7 | 1065 | pr_debug("release set %s\n", nfnl_set(cb->args[1])->name); |
2f9f28b2 | 1066 | ip_set_put_byindex((ip_set_id_t) cb->args[1]); |
a7b4f989 JK |
1067 | } |
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | static inline void | |
1072 | dump_attrs(struct nlmsghdr *nlh) | |
1073 | { | |
1074 | const struct nlattr *attr; | |
1075 | int rem; | |
1076 | ||
1077 | pr_debug("dump nlmsg\n"); | |
1078 | nlmsg_for_each_attr(attr, nlh, sizeof(struct nfgenmsg), rem) { | |
1079 | pr_debug("type: %u, len %u\n", nla_type(attr), attr->nla_len); | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | static int | |
1084 | dump_init(struct netlink_callback *cb) | |
1085 | { | |
1086 | struct nlmsghdr *nlh = nlmsg_hdr(cb->skb); | |
573ce260 | 1087 | int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); |
a7b4f989 JK |
1088 | struct nlattr *cda[IPSET_ATTR_CMD_MAX+1]; |
1089 | struct nlattr *attr = (void *)nlh + min_len; | |
c1e2e043 | 1090 | u32 dump_type; |
a7b4f989 JK |
1091 | ip_set_id_t index; |
1092 | ||
1093 | /* Second pass, so parser can't fail */ | |
1094 | nla_parse(cda, IPSET_ATTR_CMD_MAX, | |
1095 | attr, nlh->nlmsg_len - min_len, ip_set_setname_policy); | |
1096 | ||
1097 | /* cb->args[0] : dump single set/all sets | |
1098 | * [1] : set index | |
1099 | * [..]: type specific | |
1100 | */ | |
1101 | ||
c1e2e043 | 1102 | if (cda[IPSET_ATTR_SETNAME]) { |
9076aea7 JK |
1103 | struct ip_set *set; |
1104 | ||
1105 | set = find_set_and_id(nla_data(cda[IPSET_ATTR_SETNAME]), | |
1106 | &index); | |
1107 | if (set == NULL) | |
c1e2e043 | 1108 | return -ENOENT; |
a7b4f989 | 1109 | |
c1e2e043 JK |
1110 | dump_type = DUMP_ONE; |
1111 | cb->args[1] = index; | |
1112 | } else | |
1113 | dump_type = DUMP_ALL; | |
1114 | ||
1115 | if (cda[IPSET_ATTR_FLAGS]) { | |
1116 | u32 f = ip_set_get_h32(cda[IPSET_ATTR_FLAGS]); | |
1117 | dump_type |= (f << 16); | |
1118 | } | |
1119 | cb->args[0] = dump_type; | |
a7b4f989 | 1120 | |
a7b4f989 JK |
1121 | return 0; |
1122 | } | |
1123 | ||
1124 | static int | |
1125 | ip_set_dump_start(struct sk_buff *skb, struct netlink_callback *cb) | |
1126 | { | |
1127 | ip_set_id_t index = IPSET_INVALID_ID, max; | |
1128 | struct ip_set *set = NULL; | |
1129 | struct nlmsghdr *nlh = NULL; | |
15e47304 | 1130 | unsigned int flags = NETLINK_CB(cb->skb).portid ? NLM_F_MULTI : 0; |
c1e2e043 | 1131 | u32 dump_type, dump_flags; |
a7b4f989 JK |
1132 | int ret = 0; |
1133 | ||
c1e2e043 | 1134 | if (!cb->args[0]) { |
a7b4f989 JK |
1135 | ret = dump_init(cb); |
1136 | if (ret < 0) { | |
1137 | nlh = nlmsg_hdr(cb->skb); | |
1138 | /* We have to create and send the error message | |
1139 | * manually :-( */ | |
1140 | if (nlh->nlmsg_flags & NLM_F_ACK) | |
1141 | netlink_ack(cb->skb, nlh, ret); | |
1142 | return ret; | |
1143 | } | |
1144 | } | |
1145 | ||
1146 | if (cb->args[1] >= ip_set_max) | |
1147 | goto out; | |
1148 | ||
c1e2e043 JK |
1149 | dump_type = DUMP_TYPE(cb->args[0]); |
1150 | dump_flags = DUMP_FLAGS(cb->args[0]); | |
1151 | max = dump_type == DUMP_ONE ? cb->args[1] + 1 : ip_set_max; | |
a8a8a093 | 1152 | dump_last: |
c1e2e043 JK |
1153 | pr_debug("args[0]: %u %u args[1]: %ld\n", |
1154 | dump_type, dump_flags, cb->args[1]); | |
a7b4f989 JK |
1155 | for (; cb->args[1] < max; cb->args[1]++) { |
1156 | index = (ip_set_id_t) cb->args[1]; | |
9076aea7 | 1157 | set = nfnl_set(index); |
a7b4f989 | 1158 | if (set == NULL) { |
c1e2e043 | 1159 | if (dump_type == DUMP_ONE) { |
a7b4f989 JK |
1160 | ret = -ENOENT; |
1161 | goto out; | |
1162 | } | |
1163 | continue; | |
1164 | } | |
1165 | /* When dumping all sets, we must dump "sorted" | |
1166 | * so that lists (unions of sets) are dumped last. | |
1167 | */ | |
c1e2e043 JK |
1168 | if (dump_type != DUMP_ONE && |
1169 | ((dump_type == DUMP_ALL) == | |
a8a8a093 | 1170 | !!(set->type->features & IPSET_DUMP_LAST))) |
a7b4f989 JK |
1171 | continue; |
1172 | pr_debug("List set: %s\n", set->name); | |
1173 | if (!cb->args[2]) { | |
1174 | /* Start listing: make sure set won't be destroyed */ | |
1175 | pr_debug("reference set\n"); | |
9076aea7 | 1176 | __ip_set_get(set); |
a7b4f989 | 1177 | } |
15e47304 | 1178 | nlh = start_msg(skb, NETLINK_CB(cb->skb).portid, |
a7b4f989 JK |
1179 | cb->nlh->nlmsg_seq, flags, |
1180 | IPSET_CMD_LIST); | |
1181 | if (!nlh) { | |
1182 | ret = -EMSGSIZE; | |
1183 | goto release_refcount; | |
1184 | } | |
7cf7899d DM |
1185 | if (nla_put_u8(skb, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || |
1186 | nla_put_string(skb, IPSET_ATTR_SETNAME, set->name)) | |
1187 | goto nla_put_failure; | |
c1e2e043 JK |
1188 | if (dump_flags & IPSET_FLAG_LIST_SETNAME) |
1189 | goto next_set; | |
a7b4f989 JK |
1190 | switch (cb->args[2]) { |
1191 | case 0: | |
1192 | /* Core header data */ | |
7cf7899d DM |
1193 | if (nla_put_string(skb, IPSET_ATTR_TYPENAME, |
1194 | set->type->name) || | |
1195 | nla_put_u8(skb, IPSET_ATTR_FAMILY, | |
1196 | set->family) || | |
1197 | nla_put_u8(skb, IPSET_ATTR_REVISION, | |
1198 | set->revision)) | |
1199 | goto nla_put_failure; | |
a7b4f989 JK |
1200 | ret = set->variant->head(set, skb); |
1201 | if (ret < 0) | |
1202 | goto release_refcount; | |
c1e2e043 JK |
1203 | if (dump_flags & IPSET_FLAG_LIST_HEADER) |
1204 | goto next_set; | |
a7b4f989 JK |
1205 | /* Fall through and add elements */ |
1206 | default: | |
1207 | read_lock_bh(&set->lock); | |
1208 | ret = set->variant->list(set, skb, cb); | |
1209 | read_unlock_bh(&set->lock); | |
c1e2e043 | 1210 | if (!cb->args[2]) |
a7b4f989 | 1211 | /* Set is done, proceed with next one */ |
c1e2e043 | 1212 | goto next_set; |
a7b4f989 JK |
1213 | goto release_refcount; |
1214 | } | |
1215 | } | |
a8a8a093 | 1216 | /* If we dump all sets, continue with dumping last ones */ |
c1e2e043 JK |
1217 | if (dump_type == DUMP_ALL) { |
1218 | dump_type = DUMP_LAST; | |
1219 | cb->args[0] = dump_type | (dump_flags << 16); | |
a8a8a093 JK |
1220 | cb->args[1] = 0; |
1221 | goto dump_last; | |
1222 | } | |
a7b4f989 JK |
1223 | goto out; |
1224 | ||
1225 | nla_put_failure: | |
1226 | ret = -EFAULT; | |
c1e2e043 JK |
1227 | next_set: |
1228 | if (dump_type == DUMP_ONE) | |
1229 | cb->args[1] = IPSET_INVALID_ID; | |
1230 | else | |
1231 | cb->args[1]++; | |
a7b4f989 JK |
1232 | release_refcount: |
1233 | /* If there was an error or set is done, release set */ | |
1234 | if (ret || !cb->args[2]) { | |
9076aea7 | 1235 | pr_debug("release set %s\n", nfnl_set(index)->name); |
2f9f28b2 | 1236 | ip_set_put_byindex(index); |
be94db9d | 1237 | cb->args[2] = 0; |
a7b4f989 | 1238 | } |
a7b4f989 JK |
1239 | out: |
1240 | if (nlh) { | |
1241 | nlmsg_end(skb, nlh); | |
1242 | pr_debug("nlmsg_len: %u\n", nlh->nlmsg_len); | |
1243 | dump_attrs(nlh); | |
1244 | } | |
1245 | ||
1246 | return ret < 0 ? ret : skb->len; | |
1247 | } | |
1248 | ||
1249 | static int | |
1250 | ip_set_dump(struct sock *ctnl, struct sk_buff *skb, | |
1251 | const struct nlmsghdr *nlh, | |
1252 | const struct nlattr * const attr[]) | |
1253 | { | |
1254 | if (unlikely(protocol_failed(attr))) | |
1255 | return -IPSET_ERR_PROTOCOL; | |
1256 | ||
80d326fa PNA |
1257 | { |
1258 | struct netlink_dump_control c = { | |
1259 | .dump = ip_set_dump_start, | |
1260 | .done = ip_set_dump_done, | |
1261 | }; | |
1262 | return netlink_dump_start(ctnl, skb, nlh, &c); | |
1263 | } | |
a7b4f989 JK |
1264 | } |
1265 | ||
1266 | /* Add, del and test */ | |
1267 | ||
1268 | static const struct nla_policy ip_set_adt_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1269 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1270 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
1271 | .len = IPSET_MAXNAMELEN - 1 }, | |
1272 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, | |
1273 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, | |
1274 | [IPSET_ATTR_ADT] = { .type = NLA_NESTED }, | |
1275 | }; | |
1276 | ||
1277 | static int | |
5f52bc3c | 1278 | call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set, |
a7b4f989 JK |
1279 | struct nlattr *tb[], enum ipset_adt adt, |
1280 | u32 flags, bool use_lineno) | |
1281 | { | |
3d14b171 | 1282 | int ret; |
a7b4f989 | 1283 | u32 lineno = 0; |
3d14b171 | 1284 | bool eexist = flags & IPSET_FLAG_EXIST, retried = false; |
a7b4f989 JK |
1285 | |
1286 | do { | |
1287 | write_lock_bh(&set->lock); | |
3d14b171 | 1288 | ret = set->variant->uadt(set, tb, adt, &lineno, flags, retried); |
a7b4f989 | 1289 | write_unlock_bh(&set->lock); |
3d14b171 | 1290 | retried = true; |
a7b4f989 JK |
1291 | } while (ret == -EAGAIN && |
1292 | set->variant->resize && | |
3d14b171 | 1293 | (ret = set->variant->resize(set, retried)) == 0); |
a7b4f989 JK |
1294 | |
1295 | if (!ret || (ret == -IPSET_ERR_EXIST && eexist)) | |
1296 | return 0; | |
1297 | if (lineno && use_lineno) { | |
1298 | /* Error in restore/batch mode: send back lineno */ | |
5f52bc3c JK |
1299 | struct nlmsghdr *rep, *nlh = nlmsg_hdr(skb); |
1300 | struct sk_buff *skb2; | |
1301 | struct nlmsgerr *errmsg; | |
1302 | size_t payload = sizeof(*errmsg) + nlmsg_len(nlh); | |
573ce260 | 1303 | int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); |
a7b4f989 | 1304 | struct nlattr *cda[IPSET_ATTR_CMD_MAX+1]; |
5f52bc3c | 1305 | struct nlattr *cmdattr; |
a7b4f989 JK |
1306 | u32 *errline; |
1307 | ||
5f52bc3c JK |
1308 | skb2 = nlmsg_new(payload, GFP_KERNEL); |
1309 | if (skb2 == NULL) | |
1310 | return -ENOMEM; | |
15e47304 | 1311 | rep = __nlmsg_put(skb2, NETLINK_CB(skb).portid, |
5f52bc3c JK |
1312 | nlh->nlmsg_seq, NLMSG_ERROR, payload, 0); |
1313 | errmsg = nlmsg_data(rep); | |
1314 | errmsg->error = ret; | |
1315 | memcpy(&errmsg->msg, nlh, nlh->nlmsg_len); | |
1316 | cmdattr = (void *)&errmsg->msg + min_len; | |
1317 | ||
a7b4f989 JK |
1318 | nla_parse(cda, IPSET_ATTR_CMD_MAX, |
1319 | cmdattr, nlh->nlmsg_len - min_len, | |
1320 | ip_set_adt_policy); | |
1321 | ||
1322 | errline = nla_data(cda[IPSET_ATTR_LINENO]); | |
1323 | ||
1324 | *errline = lineno; | |
5f52bc3c | 1325 | |
15e47304 | 1326 | netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
5f52bc3c JK |
1327 | /* Signal netlink not to send its ACK/errmsg. */ |
1328 | return -EINTR; | |
a7b4f989 JK |
1329 | } |
1330 | ||
1331 | return ret; | |
1332 | } | |
1333 | ||
1334 | static int | |
1335 | ip_set_uadd(struct sock *ctnl, struct sk_buff *skb, | |
1336 | const struct nlmsghdr *nlh, | |
1337 | const struct nlattr * const attr[]) | |
1338 | { | |
1339 | struct ip_set *set; | |
1340 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; | |
1341 | const struct nlattr *nla; | |
1342 | u32 flags = flag_exist(nlh); | |
1343 | bool use_lineno; | |
1344 | int ret = 0; | |
1345 | ||
1346 | if (unlikely(protocol_failed(attr) || | |
1347 | attr[IPSET_ATTR_SETNAME] == NULL || | |
1348 | !((attr[IPSET_ATTR_DATA] != NULL) ^ | |
1349 | (attr[IPSET_ATTR_ADT] != NULL)) || | |
1350 | (attr[IPSET_ATTR_DATA] != NULL && | |
1351 | !flag_nested(attr[IPSET_ATTR_DATA])) || | |
1352 | (attr[IPSET_ATTR_ADT] != NULL && | |
1353 | (!flag_nested(attr[IPSET_ATTR_ADT]) || | |
1354 | attr[IPSET_ATTR_LINENO] == NULL)))) | |
1355 | return -IPSET_ERR_PROTOCOL; | |
1356 | ||
1357 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); | |
1358 | if (set == NULL) | |
1359 | return -ENOENT; | |
1360 | ||
1361 | use_lineno = !!attr[IPSET_ATTR_LINENO]; | |
1362 | if (attr[IPSET_ATTR_DATA]) { | |
8da560ce PM |
1363 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
1364 | attr[IPSET_ATTR_DATA], | |
1365 | set->type->adt_policy)) | |
a7b4f989 | 1366 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c JK |
1367 | ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, flags, |
1368 | use_lineno); | |
a7b4f989 JK |
1369 | } else { |
1370 | int nla_rem; | |
1371 | ||
1372 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { | |
1373 | memset(tb, 0, sizeof(tb)); | |
1374 | if (nla_type(nla) != IPSET_ATTR_DATA || | |
1375 | !flag_nested(nla) || | |
8da560ce PM |
1376 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
1377 | set->type->adt_policy)) | |
a7b4f989 | 1378 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c | 1379 | ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, |
a7b4f989 JK |
1380 | flags, use_lineno); |
1381 | if (ret < 0) | |
1382 | return ret; | |
1383 | } | |
1384 | } | |
1385 | return ret; | |
1386 | } | |
1387 | ||
1388 | static int | |
1389 | ip_set_udel(struct sock *ctnl, struct sk_buff *skb, | |
1390 | const struct nlmsghdr *nlh, | |
1391 | const struct nlattr * const attr[]) | |
1392 | { | |
1393 | struct ip_set *set; | |
1394 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; | |
1395 | const struct nlattr *nla; | |
1396 | u32 flags = flag_exist(nlh); | |
1397 | bool use_lineno; | |
1398 | int ret = 0; | |
1399 | ||
1400 | if (unlikely(protocol_failed(attr) || | |
1401 | attr[IPSET_ATTR_SETNAME] == NULL || | |
1402 | !((attr[IPSET_ATTR_DATA] != NULL) ^ | |
1403 | (attr[IPSET_ATTR_ADT] != NULL)) || | |
1404 | (attr[IPSET_ATTR_DATA] != NULL && | |
1405 | !flag_nested(attr[IPSET_ATTR_DATA])) || | |
1406 | (attr[IPSET_ATTR_ADT] != NULL && | |
1407 | (!flag_nested(attr[IPSET_ATTR_ADT]) || | |
1408 | attr[IPSET_ATTR_LINENO] == NULL)))) | |
1409 | return -IPSET_ERR_PROTOCOL; | |
1410 | ||
1411 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); | |
1412 | if (set == NULL) | |
1413 | return -ENOENT; | |
1414 | ||
1415 | use_lineno = !!attr[IPSET_ATTR_LINENO]; | |
1416 | if (attr[IPSET_ATTR_DATA]) { | |
8da560ce PM |
1417 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
1418 | attr[IPSET_ATTR_DATA], | |
1419 | set->type->adt_policy)) | |
a7b4f989 | 1420 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c JK |
1421 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, flags, |
1422 | use_lineno); | |
a7b4f989 JK |
1423 | } else { |
1424 | int nla_rem; | |
1425 | ||
1426 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { | |
1427 | memset(tb, 0, sizeof(*tb)); | |
1428 | if (nla_type(nla) != IPSET_ATTR_DATA || | |
1429 | !flag_nested(nla) || | |
8da560ce PM |
1430 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
1431 | set->type->adt_policy)) | |
a7b4f989 | 1432 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c | 1433 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, |
a7b4f989 JK |
1434 | flags, use_lineno); |
1435 | if (ret < 0) | |
1436 | return ret; | |
1437 | } | |
1438 | } | |
1439 | return ret; | |
1440 | } | |
1441 | ||
1442 | static int | |
1443 | ip_set_utest(struct sock *ctnl, struct sk_buff *skb, | |
1444 | const struct nlmsghdr *nlh, | |
1445 | const struct nlattr * const attr[]) | |
1446 | { | |
1447 | struct ip_set *set; | |
1448 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; | |
1449 | int ret = 0; | |
1450 | ||
1451 | if (unlikely(protocol_failed(attr) || | |
1452 | attr[IPSET_ATTR_SETNAME] == NULL || | |
1453 | attr[IPSET_ATTR_DATA] == NULL || | |
1454 | !flag_nested(attr[IPSET_ATTR_DATA]))) | |
1455 | return -IPSET_ERR_PROTOCOL; | |
1456 | ||
1457 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); | |
1458 | if (set == NULL) | |
1459 | return -ENOENT; | |
1460 | ||
8da560ce PM |
1461 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA], |
1462 | set->type->adt_policy)) | |
a7b4f989 JK |
1463 | return -IPSET_ERR_PROTOCOL; |
1464 | ||
1465 | read_lock_bh(&set->lock); | |
3d14b171 | 1466 | ret = set->variant->uadt(set, tb, IPSET_TEST, NULL, 0, 0); |
a7b4f989 JK |
1467 | read_unlock_bh(&set->lock); |
1468 | /* Userspace can't trigger element to be re-added */ | |
1469 | if (ret == -EAGAIN) | |
1470 | ret = 1; | |
1471 | ||
dd82088d JK |
1472 | return (ret < 0 && ret != -ENOTEMPTY) ? ret : |
1473 | ret > 0 ? 0 : -IPSET_ERR_EXIST; | |
a7b4f989 JK |
1474 | } |
1475 | ||
1476 | /* Get headed data of a set */ | |
1477 | ||
1478 | static int | |
1479 | ip_set_header(struct sock *ctnl, struct sk_buff *skb, | |
1480 | const struct nlmsghdr *nlh, | |
1481 | const struct nlattr * const attr[]) | |
1482 | { | |
1483 | const struct ip_set *set; | |
1484 | struct sk_buff *skb2; | |
1485 | struct nlmsghdr *nlh2; | |
a7b4f989 JK |
1486 | int ret = 0; |
1487 | ||
1488 | if (unlikely(protocol_failed(attr) || | |
1489 | attr[IPSET_ATTR_SETNAME] == NULL)) | |
1490 | return -IPSET_ERR_PROTOCOL; | |
1491 | ||
9076aea7 JK |
1492 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); |
1493 | if (set == NULL) | |
a7b4f989 | 1494 | return -ENOENT; |
a7b4f989 JK |
1495 | |
1496 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1497 | if (skb2 == NULL) | |
1498 | return -ENOMEM; | |
1499 | ||
15e47304 | 1500 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
a7b4f989 JK |
1501 | IPSET_CMD_HEADER); |
1502 | if (!nlh2) | |
1503 | goto nlmsg_failure; | |
7cf7899d DM |
1504 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || |
1505 | nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name) || | |
1506 | nla_put_string(skb2, IPSET_ATTR_TYPENAME, set->type->name) || | |
1507 | nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) || | |
1508 | nla_put_u8(skb2, IPSET_ATTR_REVISION, set->revision)) | |
1509 | goto nla_put_failure; | |
a7b4f989 JK |
1510 | nlmsg_end(skb2, nlh2); |
1511 | ||
15e47304 | 1512 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
a7b4f989 JK |
1513 | if (ret < 0) |
1514 | return ret; | |
1515 | ||
1516 | return 0; | |
1517 | ||
1518 | nla_put_failure: | |
1519 | nlmsg_cancel(skb2, nlh2); | |
1520 | nlmsg_failure: | |
1521 | kfree_skb(skb2); | |
1522 | return -EMSGSIZE; | |
1523 | } | |
1524 | ||
1525 | /* Get type data */ | |
1526 | ||
1527 | static const struct nla_policy ip_set_type_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1528 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1529 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, | |
1530 | .len = IPSET_MAXNAMELEN - 1 }, | |
1531 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, | |
1532 | }; | |
1533 | ||
1534 | static int | |
1535 | ip_set_type(struct sock *ctnl, struct sk_buff *skb, | |
1536 | const struct nlmsghdr *nlh, | |
1537 | const struct nlattr * const attr[]) | |
1538 | { | |
1539 | struct sk_buff *skb2; | |
1540 | struct nlmsghdr *nlh2; | |
1541 | u8 family, min, max; | |
1542 | const char *typename; | |
1543 | int ret = 0; | |
1544 | ||
1545 | if (unlikely(protocol_failed(attr) || | |
1546 | attr[IPSET_ATTR_TYPENAME] == NULL || | |
1547 | attr[IPSET_ATTR_FAMILY] == NULL)) | |
1548 | return -IPSET_ERR_PROTOCOL; | |
1549 | ||
1550 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); | |
1551 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); | |
1552 | ret = find_set_type_minmax(typename, family, &min, &max); | |
1553 | if (ret) | |
1554 | return ret; | |
1555 | ||
1556 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1557 | if (skb2 == NULL) | |
1558 | return -ENOMEM; | |
1559 | ||
15e47304 | 1560 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
a7b4f989 JK |
1561 | IPSET_CMD_TYPE); |
1562 | if (!nlh2) | |
1563 | goto nlmsg_failure; | |
7cf7899d DM |
1564 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || |
1565 | nla_put_string(skb2, IPSET_ATTR_TYPENAME, typename) || | |
1566 | nla_put_u8(skb2, IPSET_ATTR_FAMILY, family) || | |
1567 | nla_put_u8(skb2, IPSET_ATTR_REVISION, max) || | |
1568 | nla_put_u8(skb2, IPSET_ATTR_REVISION_MIN, min)) | |
1569 | goto nla_put_failure; | |
a7b4f989 JK |
1570 | nlmsg_end(skb2, nlh2); |
1571 | ||
1572 | pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len); | |
15e47304 | 1573 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
a7b4f989 JK |
1574 | if (ret < 0) |
1575 | return ret; | |
1576 | ||
1577 | return 0; | |
1578 | ||
1579 | nla_put_failure: | |
1580 | nlmsg_cancel(skb2, nlh2); | |
1581 | nlmsg_failure: | |
1582 | kfree_skb(skb2); | |
1583 | return -EMSGSIZE; | |
1584 | } | |
1585 | ||
1586 | /* Get protocol version */ | |
1587 | ||
1588 | static const struct nla_policy | |
1589 | ip_set_protocol_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1590 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1591 | }; | |
1592 | ||
1593 | static int | |
1594 | ip_set_protocol(struct sock *ctnl, struct sk_buff *skb, | |
1595 | const struct nlmsghdr *nlh, | |
1596 | const struct nlattr * const attr[]) | |
1597 | { | |
1598 | struct sk_buff *skb2; | |
1599 | struct nlmsghdr *nlh2; | |
1600 | int ret = 0; | |
1601 | ||
1602 | if (unlikely(attr[IPSET_ATTR_PROTOCOL] == NULL)) | |
1603 | return -IPSET_ERR_PROTOCOL; | |
1604 | ||
1605 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1606 | if (skb2 == NULL) | |
1607 | return -ENOMEM; | |
1608 | ||
15e47304 | 1609 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
a7b4f989 JK |
1610 | IPSET_CMD_PROTOCOL); |
1611 | if (!nlh2) | |
1612 | goto nlmsg_failure; | |
7cf7899d DM |
1613 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL)) |
1614 | goto nla_put_failure; | |
a7b4f989 JK |
1615 | nlmsg_end(skb2, nlh2); |
1616 | ||
15e47304 | 1617 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
a7b4f989 JK |
1618 | if (ret < 0) |
1619 | return ret; | |
1620 | ||
1621 | return 0; | |
1622 | ||
1623 | nla_put_failure: | |
1624 | nlmsg_cancel(skb2, nlh2); | |
1625 | nlmsg_failure: | |
1626 | kfree_skb(skb2); | |
1627 | return -EMSGSIZE; | |
1628 | } | |
1629 | ||
1630 | static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = { | |
d31f4d44 TB |
1631 | [IPSET_CMD_NONE] = { |
1632 | .call = ip_set_none, | |
1633 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1634 | }, | |
a7b4f989 JK |
1635 | [IPSET_CMD_CREATE] = { |
1636 | .call = ip_set_create, | |
1637 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1638 | .policy = ip_set_create_policy, | |
1639 | }, | |
1640 | [IPSET_CMD_DESTROY] = { | |
1641 | .call = ip_set_destroy, | |
1642 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1643 | .policy = ip_set_setname_policy, | |
1644 | }, | |
1645 | [IPSET_CMD_FLUSH] = { | |
1646 | .call = ip_set_flush, | |
1647 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1648 | .policy = ip_set_setname_policy, | |
1649 | }, | |
1650 | [IPSET_CMD_RENAME] = { | |
1651 | .call = ip_set_rename, | |
1652 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1653 | .policy = ip_set_setname2_policy, | |
1654 | }, | |
1655 | [IPSET_CMD_SWAP] = { | |
1656 | .call = ip_set_swap, | |
1657 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1658 | .policy = ip_set_setname2_policy, | |
1659 | }, | |
1660 | [IPSET_CMD_LIST] = { | |
1661 | .call = ip_set_dump, | |
1662 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1663 | .policy = ip_set_setname_policy, | |
1664 | }, | |
1665 | [IPSET_CMD_SAVE] = { | |
1666 | .call = ip_set_dump, | |
1667 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1668 | .policy = ip_set_setname_policy, | |
1669 | }, | |
1670 | [IPSET_CMD_ADD] = { | |
1671 | .call = ip_set_uadd, | |
1672 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1673 | .policy = ip_set_adt_policy, | |
1674 | }, | |
1675 | [IPSET_CMD_DEL] = { | |
1676 | .call = ip_set_udel, | |
1677 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1678 | .policy = ip_set_adt_policy, | |
1679 | }, | |
1680 | [IPSET_CMD_TEST] = { | |
1681 | .call = ip_set_utest, | |
1682 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1683 | .policy = ip_set_adt_policy, | |
1684 | }, | |
1685 | [IPSET_CMD_HEADER] = { | |
1686 | .call = ip_set_header, | |
1687 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1688 | .policy = ip_set_setname_policy, | |
1689 | }, | |
1690 | [IPSET_CMD_TYPE] = { | |
1691 | .call = ip_set_type, | |
1692 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1693 | .policy = ip_set_type_policy, | |
1694 | }, | |
1695 | [IPSET_CMD_PROTOCOL] = { | |
1696 | .call = ip_set_protocol, | |
1697 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1698 | .policy = ip_set_protocol_policy, | |
1699 | }, | |
1700 | }; | |
1701 | ||
1702 | static struct nfnetlink_subsystem ip_set_netlink_subsys __read_mostly = { | |
1703 | .name = "ip_set", | |
1704 | .subsys_id = NFNL_SUBSYS_IPSET, | |
1705 | .cb_count = IPSET_MSG_MAX, | |
1706 | .cb = ip_set_netlink_subsys_cb, | |
1707 | }; | |
1708 | ||
1709 | /* Interface to iptables/ip6tables */ | |
1710 | ||
1711 | static int | |
1712 | ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len) | |
1713 | { | |
95c96174 | 1714 | unsigned int *op; |
a7b4f989 JK |
1715 | void *data; |
1716 | int copylen = *len, ret = 0; | |
1717 | ||
df008c91 | 1718 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
a7b4f989 JK |
1719 | return -EPERM; |
1720 | if (optval != SO_IP_SET) | |
1721 | return -EBADF; | |
95c96174 | 1722 | if (*len < sizeof(unsigned int)) |
a7b4f989 JK |
1723 | return -EINVAL; |
1724 | ||
1725 | data = vmalloc(*len); | |
1726 | if (!data) | |
1727 | return -ENOMEM; | |
1728 | if (copy_from_user(data, user, *len) != 0) { | |
1729 | ret = -EFAULT; | |
1730 | goto done; | |
1731 | } | |
95c96174 | 1732 | op = (unsigned int *) data; |
a7b4f989 JK |
1733 | |
1734 | if (*op < IP_SET_OP_VERSION) { | |
1735 | /* Check the version at the beginning of operations */ | |
1736 | struct ip_set_req_version *req_version = data; | |
1737 | if (req_version->version != IPSET_PROTOCOL) { | |
1738 | ret = -EPROTO; | |
1739 | goto done; | |
1740 | } | |
1741 | } | |
1742 | ||
1743 | switch (*op) { | |
1744 | case IP_SET_OP_VERSION: { | |
1745 | struct ip_set_req_version *req_version = data; | |
1746 | ||
1747 | if (*len != sizeof(struct ip_set_req_version)) { | |
1748 | ret = -EINVAL; | |
1749 | goto done; | |
1750 | } | |
1751 | ||
1752 | req_version->version = IPSET_PROTOCOL; | |
1753 | ret = copy_to_user(user, req_version, | |
1754 | sizeof(struct ip_set_req_version)); | |
1755 | goto done; | |
1756 | } | |
1757 | case IP_SET_OP_GET_BYNAME: { | |
1758 | struct ip_set_req_get_set *req_get = data; | |
9076aea7 | 1759 | ip_set_id_t id; |
a7b4f989 JK |
1760 | |
1761 | if (*len != sizeof(struct ip_set_req_get_set)) { | |
1762 | ret = -EINVAL; | |
1763 | goto done; | |
1764 | } | |
1765 | req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; | |
c14b78e7 | 1766 | nfnl_lock(NFNL_SUBSYS_IPSET); |
9076aea7 JK |
1767 | find_set_and_id(req_get->set.name, &id); |
1768 | req_get->set.index = id; | |
c14b78e7 | 1769 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
1770 | goto copy; |
1771 | } | |
1772 | case IP_SET_OP_GET_BYINDEX: { | |
1773 | struct ip_set_req_get_set *req_get = data; | |
9076aea7 | 1774 | struct ip_set *set; |
a7b4f989 JK |
1775 | |
1776 | if (*len != sizeof(struct ip_set_req_get_set) || | |
1777 | req_get->set.index >= ip_set_max) { | |
1778 | ret = -EINVAL; | |
1779 | goto done; | |
1780 | } | |
c14b78e7 | 1781 | nfnl_lock(NFNL_SUBSYS_IPSET); |
9076aea7 JK |
1782 | set = nfnl_set(req_get->set.index); |
1783 | strncpy(req_get->set.name, set ? set->name : "", | |
a7b4f989 | 1784 | IPSET_MAXNAMELEN); |
c14b78e7 | 1785 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
1786 | goto copy; |
1787 | } | |
1788 | default: | |
1789 | ret = -EBADMSG; | |
1790 | goto done; | |
1791 | } /* end of switch(op) */ | |
1792 | ||
1793 | copy: | |
1794 | ret = copy_to_user(user, data, copylen); | |
1795 | ||
1796 | done: | |
1797 | vfree(data); | |
1798 | if (ret > 0) | |
1799 | ret = 0; | |
1800 | return ret; | |
1801 | } | |
1802 | ||
1803 | static struct nf_sockopt_ops so_set __read_mostly = { | |
1804 | .pf = PF_INET, | |
1805 | .get_optmin = SO_IP_SET, | |
1806 | .get_optmax = SO_IP_SET + 1, | |
1807 | .get = &ip_set_sockfn_get, | |
1808 | .owner = THIS_MODULE, | |
1809 | }; | |
1810 | ||
1811 | static int __init | |
1812 | ip_set_init(void) | |
1813 | { | |
9076aea7 | 1814 | struct ip_set **list; |
a7b4f989 JK |
1815 | int ret; |
1816 | ||
1817 | if (max_sets) | |
1818 | ip_set_max = max_sets; | |
1819 | if (ip_set_max >= IPSET_INVALID_ID) | |
1820 | ip_set_max = IPSET_INVALID_ID - 1; | |
1821 | ||
9076aea7 JK |
1822 | list = kzalloc(sizeof(struct ip_set *) * ip_set_max, GFP_KERNEL); |
1823 | if (!list) | |
a7b4f989 | 1824 | return -ENOMEM; |
a7b4f989 | 1825 | |
9076aea7 | 1826 | rcu_assign_pointer(ip_set_list, list); |
a7b4f989 JK |
1827 | ret = nfnetlink_subsys_register(&ip_set_netlink_subsys); |
1828 | if (ret != 0) { | |
1829 | pr_err("ip_set: cannot register with nfnetlink.\n"); | |
9076aea7 | 1830 | kfree(list); |
a7b4f989 JK |
1831 | return ret; |
1832 | } | |
1833 | ret = nf_register_sockopt(&so_set); | |
1834 | if (ret != 0) { | |
1835 | pr_err("SO_SET registry failed: %d\n", ret); | |
1836 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); | |
9076aea7 | 1837 | kfree(list); |
a7b4f989 JK |
1838 | return ret; |
1839 | } | |
1840 | ||
1841 | pr_notice("ip_set: protocol %u\n", IPSET_PROTOCOL); | |
1842 | return 0; | |
1843 | } | |
1844 | ||
1845 | static void __exit | |
1846 | ip_set_fini(void) | |
1847 | { | |
9076aea7 JK |
1848 | struct ip_set **list = rcu_dereference_protected(ip_set_list, 1); |
1849 | ||
a7b4f989 JK |
1850 | /* There can't be any existing set */ |
1851 | nf_unregister_sockopt(&so_set); | |
1852 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); | |
9076aea7 | 1853 | kfree(list); |
a7b4f989 JK |
1854 | pr_debug("these are the famous last words\n"); |
1855 | } | |
1856 | ||
1857 | module_init(ip_set_init); | |
1858 | module_exit(ip_set_fini); |