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a7b4f989 JK |
1 | /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu> |
2 | * Patrick Schaaf <bof@bof.de> | |
075e64c0 | 3 | * Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
a7b4f989 JK |
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 | 19 | #include <net/netlink.h> |
1785e8f4 VL |
20 | #include <net/net_namespace.h> |
21 | #include <net/netns/generic.h> | |
a7b4f989 JK |
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 | 31 | |
1785e8f4 VL |
32 | struct ip_set_net { |
33 | struct ip_set * __rcu *ip_set_list; /* all individual sets */ | |
34 | ip_set_id_t ip_set_max; /* max number of sets */ | |
35 | int is_deleted; /* deleted by ip_set_net_exit */ | |
36 | }; | |
37 | static int ip_set_net_id __read_mostly; | |
38 | ||
39 | static inline struct ip_set_net *ip_set_pernet(struct net *net) | |
40 | { | |
41 | return net_generic(net, ip_set_net_id); | |
42 | } | |
a7b4f989 | 43 | |
9076aea7 | 44 | #define IP_SET_INC 64 |
a7b4f989 JK |
45 | #define STREQ(a, b) (strncmp(a, b, IPSET_MAXNAMELEN) == 0) |
46 | ||
47 | static unsigned int max_sets; | |
48 | ||
49 | module_param(max_sets, int, 0600); | |
50 | MODULE_PARM_DESC(max_sets, "maximal number of sets"); | |
51 | MODULE_LICENSE("GPL"); | |
52 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); | |
53 | MODULE_DESCRIPTION("core IP set support"); | |
54 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_IPSET); | |
55 | ||
9076aea7 | 56 | /* When the nfnl mutex is held: */ |
3e90ebd3 | 57 | #define ip_set_dereference(p) \ |
9076aea7 | 58 | rcu_dereference_protected(p, 1) |
3e90ebd3 PM |
59 | #define ip_set(inst, id) \ |
60 | ip_set_dereference((inst)->ip_set_list)[id] | |
9076aea7 | 61 | |
a7b4f989 JK |
62 | /* |
63 | * The set types are implemented in modules and registered set types | |
64 | * can be found in ip_set_type_list. Adding/deleting types is | |
65 | * serialized by ip_set_type_mutex. | |
66 | */ | |
67 | ||
68 | static inline void | |
69 | ip_set_type_lock(void) | |
70 | { | |
71 | mutex_lock(&ip_set_type_mutex); | |
72 | } | |
73 | ||
74 | static inline void | |
75 | ip_set_type_unlock(void) | |
76 | { | |
77 | mutex_unlock(&ip_set_type_mutex); | |
78 | } | |
79 | ||
80 | /* Register and deregister settype */ | |
81 | ||
82 | static struct ip_set_type * | |
83 | find_set_type(const char *name, u8 family, u8 revision) | |
84 | { | |
85 | struct ip_set_type *type; | |
86 | ||
87 | list_for_each_entry_rcu(type, &ip_set_type_list, list) | |
88 | if (STREQ(type->name, name) && | |
3ace95c0 JK |
89 | (type->family == family || |
90 | type->family == NFPROTO_UNSPEC) && | |
f1e00b39 JK |
91 | revision >= type->revision_min && |
92 | revision <= type->revision_max) | |
a7b4f989 JK |
93 | return type; |
94 | return NULL; | |
95 | } | |
96 | ||
97 | /* Unlock, try to load a set type module and lock again */ | |
088067f4 JK |
98 | static bool |
99 | load_settype(const char *name) | |
a7b4f989 | 100 | { |
c14b78e7 | 101 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
102 | pr_debug("try to load ip_set_%s\n", name); |
103 | if (request_module("ip_set_%s", name) < 0) { | |
104 | pr_warning("Can't find ip_set type %s\n", name); | |
c14b78e7 | 105 | nfnl_lock(NFNL_SUBSYS_IPSET); |
088067f4 | 106 | return false; |
a7b4f989 | 107 | } |
c14b78e7 | 108 | nfnl_lock(NFNL_SUBSYS_IPSET); |
088067f4 | 109 | return true; |
a7b4f989 JK |
110 | } |
111 | ||
112 | /* Find a set type and reference it */ | |
088067f4 JK |
113 | #define find_set_type_get(name, family, revision, found) \ |
114 | __find_set_type_get(name, family, revision, found, false) | |
115 | ||
a7b4f989 | 116 | static int |
088067f4 JK |
117 | __find_set_type_get(const char *name, u8 family, u8 revision, |
118 | struct ip_set_type **found, bool retry) | |
a7b4f989 | 119 | { |
5c1aba46 JK |
120 | struct ip_set_type *type; |
121 | int err; | |
122 | ||
088067f4 JK |
123 | if (retry && !load_settype(name)) |
124 | return -IPSET_ERR_FIND_TYPE; | |
125 | ||
a7b4f989 JK |
126 | rcu_read_lock(); |
127 | *found = find_set_type(name, family, revision); | |
128 | if (*found) { | |
5c1aba46 JK |
129 | err = !try_module_get((*found)->me) ? -EFAULT : 0; |
130 | goto unlock; | |
a7b4f989 | 131 | } |
088067f4 JK |
132 | /* Make sure the type is already loaded |
133 | * but we don't support the revision */ | |
5c1aba46 JK |
134 | list_for_each_entry_rcu(type, &ip_set_type_list, list) |
135 | if (STREQ(type->name, name)) { | |
136 | err = -IPSET_ERR_FIND_TYPE; | |
137 | goto unlock; | |
138 | } | |
a7b4f989 JK |
139 | rcu_read_unlock(); |
140 | ||
088067f4 JK |
141 | return retry ? -IPSET_ERR_FIND_TYPE : |
142 | __find_set_type_get(name, family, revision, found, true); | |
5c1aba46 JK |
143 | |
144 | unlock: | |
145 | rcu_read_unlock(); | |
146 | return err; | |
a7b4f989 JK |
147 | } |
148 | ||
149 | /* Find a given set type by name and family. | |
150 | * If we succeeded, the supported minimal and maximum revisions are | |
151 | * filled out. | |
152 | */ | |
088067f4 JK |
153 | #define find_set_type_minmax(name, family, min, max) \ |
154 | __find_set_type_minmax(name, family, min, max, false) | |
155 | ||
a7b4f989 | 156 | static int |
088067f4 JK |
157 | __find_set_type_minmax(const char *name, u8 family, u8 *min, u8 *max, |
158 | bool retry) | |
a7b4f989 JK |
159 | { |
160 | struct ip_set_type *type; | |
161 | bool found = false; | |
162 | ||
088067f4 JK |
163 | if (retry && !load_settype(name)) |
164 | return -IPSET_ERR_FIND_TYPE; | |
165 | ||
5c1aba46 | 166 | *min = 255; *max = 0; |
a7b4f989 JK |
167 | rcu_read_lock(); |
168 | list_for_each_entry_rcu(type, &ip_set_type_list, list) | |
169 | if (STREQ(type->name, name) && | |
3ace95c0 JK |
170 | (type->family == family || |
171 | type->family == NFPROTO_UNSPEC)) { | |
a7b4f989 | 172 | found = true; |
f1e00b39 JK |
173 | if (type->revision_min < *min) |
174 | *min = type->revision_min; | |
175 | if (type->revision_max > *max) | |
176 | *max = type->revision_max; | |
a7b4f989 JK |
177 | } |
178 | rcu_read_unlock(); | |
179 | if (found) | |
180 | return 0; | |
181 | ||
088067f4 JK |
182 | return retry ? -IPSET_ERR_FIND_TYPE : |
183 | __find_set_type_minmax(name, family, min, max, true); | |
a7b4f989 JK |
184 | } |
185 | ||
c15f1c83 JE |
186 | #define family_name(f) ((f) == NFPROTO_IPV4 ? "inet" : \ |
187 | (f) == NFPROTO_IPV6 ? "inet6" : "any") | |
a7b4f989 JK |
188 | |
189 | /* Register a set type structure. The type is identified by | |
190 | * the unique triple of name, family and revision. | |
191 | */ | |
192 | int | |
193 | ip_set_type_register(struct ip_set_type *type) | |
194 | { | |
195 | int ret = 0; | |
196 | ||
197 | if (type->protocol != IPSET_PROTOCOL) { | |
f1e00b39 | 198 | pr_warning("ip_set type %s, family %s, revision %u:%u uses " |
a7b4f989 JK |
199 | "wrong protocol version %u (want %u)\n", |
200 | type->name, family_name(type->family), | |
f1e00b39 JK |
201 | type->revision_min, type->revision_max, |
202 | type->protocol, IPSET_PROTOCOL); | |
a7b4f989 JK |
203 | return -EINVAL; |
204 | } | |
205 | ||
206 | ip_set_type_lock(); | |
f1e00b39 | 207 | if (find_set_type(type->name, type->family, type->revision_min)) { |
a7b4f989 | 208 | /* Duplicate! */ |
f1e00b39 | 209 | pr_warning("ip_set type %s, family %s with revision min %u " |
a7b4f989 | 210 | "already registered!\n", type->name, |
f1e00b39 | 211 | family_name(type->family), type->revision_min); |
a7b4f989 JK |
212 | ret = -EINVAL; |
213 | goto unlock; | |
214 | } | |
215 | list_add_rcu(&type->list, &ip_set_type_list); | |
f1e00b39 JK |
216 | pr_debug("type %s, family %s, revision %u:%u registered.\n", |
217 | type->name, family_name(type->family), | |
218 | type->revision_min, type->revision_max); | |
a7b4f989 JK |
219 | unlock: |
220 | ip_set_type_unlock(); | |
221 | return ret; | |
222 | } | |
223 | EXPORT_SYMBOL_GPL(ip_set_type_register); | |
224 | ||
225 | /* Unregister a set type. There's a small race with ip_set_create */ | |
226 | void | |
227 | ip_set_type_unregister(struct ip_set_type *type) | |
228 | { | |
229 | ip_set_type_lock(); | |
f1e00b39 JK |
230 | if (!find_set_type(type->name, type->family, type->revision_min)) { |
231 | pr_warning("ip_set type %s, family %s with revision min %u " | |
a7b4f989 | 232 | "not registered\n", type->name, |
f1e00b39 | 233 | family_name(type->family), type->revision_min); |
a7b4f989 JK |
234 | goto unlock; |
235 | } | |
236 | list_del_rcu(&type->list); | |
f1e00b39 JK |
237 | pr_debug("type %s, family %s with revision min %u unregistered.\n", |
238 | type->name, family_name(type->family), type->revision_min); | |
a7b4f989 JK |
239 | unlock: |
240 | ip_set_type_unlock(); | |
241 | ||
242 | synchronize_rcu(); | |
243 | } | |
244 | EXPORT_SYMBOL_GPL(ip_set_type_unregister); | |
245 | ||
246 | /* Utility functions */ | |
247 | void * | |
248 | ip_set_alloc(size_t size) | |
249 | { | |
250 | void *members = NULL; | |
251 | ||
252 | if (size < KMALLOC_MAX_SIZE) | |
253 | members = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); | |
254 | ||
255 | if (members) { | |
256 | pr_debug("%p: allocated with kmalloc\n", members); | |
257 | return members; | |
258 | } | |
259 | ||
260 | members = vzalloc(size); | |
261 | if (!members) | |
262 | return NULL; | |
263 | pr_debug("%p: allocated with vmalloc\n", members); | |
264 | ||
265 | return members; | |
266 | } | |
267 | EXPORT_SYMBOL_GPL(ip_set_alloc); | |
268 | ||
269 | void | |
270 | ip_set_free(void *members) | |
271 | { | |
272 | pr_debug("%p: free with %s\n", members, | |
273 | is_vmalloc_addr(members) ? "vfree" : "kfree"); | |
4cb28970 | 274 | kvfree(members); |
a7b4f989 JK |
275 | } |
276 | EXPORT_SYMBOL_GPL(ip_set_free); | |
277 | ||
278 | static inline bool | |
279 | flag_nested(const struct nlattr *nla) | |
280 | { | |
281 | return nla->nla_type & NLA_F_NESTED; | |
282 | } | |
283 | ||
284 | static const struct nla_policy ipaddr_policy[IPSET_ATTR_IPADDR_MAX + 1] = { | |
285 | [IPSET_ATTR_IPADDR_IPV4] = { .type = NLA_U32 }, | |
286 | [IPSET_ATTR_IPADDR_IPV6] = { .type = NLA_BINARY, | |
287 | .len = sizeof(struct in6_addr) }, | |
288 | }; | |
289 | ||
290 | int | |
291 | ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr) | |
292 | { | |
293 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX+1]; | |
294 | ||
295 | if (unlikely(!flag_nested(nla))) | |
296 | return -IPSET_ERR_PROTOCOL; | |
8da560ce | 297 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy)) |
a7b4f989 JK |
298 | return -IPSET_ERR_PROTOCOL; |
299 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV4))) | |
300 | return -IPSET_ERR_PROTOCOL; | |
301 | ||
302 | *ipaddr = nla_get_be32(tb[IPSET_ATTR_IPADDR_IPV4]); | |
303 | return 0; | |
304 | } | |
305 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr4); | |
306 | ||
307 | int | |
308 | ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr) | |
309 | { | |
310 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX+1]; | |
311 | ||
312 | if (unlikely(!flag_nested(nla))) | |
313 | return -IPSET_ERR_PROTOCOL; | |
314 | ||
8da560ce | 315 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy)) |
a7b4f989 JK |
316 | return -IPSET_ERR_PROTOCOL; |
317 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV6))) | |
318 | return -IPSET_ERR_PROTOCOL; | |
319 | ||
320 | memcpy(ipaddr, nla_data(tb[IPSET_ATTR_IPADDR_IPV6]), | |
321 | sizeof(struct in6_addr)); | |
322 | return 0; | |
323 | } | |
324 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr6); | |
325 | ||
68b63f08 | 326 | typedef void (*destroyer)(void *); |
03c8b234 JK |
327 | /* ipset data extension types, in size order */ |
328 | ||
329 | const struct ip_set_ext_type ip_set_extensions[] = { | |
330 | [IPSET_EXT_ID_COUNTER] = { | |
331 | .type = IPSET_EXT_COUNTER, | |
332 | .flag = IPSET_FLAG_WITH_COUNTERS, | |
333 | .len = sizeof(struct ip_set_counter), | |
334 | .align = __alignof__(struct ip_set_counter), | |
335 | }, | |
336 | [IPSET_EXT_ID_TIMEOUT] = { | |
337 | .type = IPSET_EXT_TIMEOUT, | |
338 | .len = sizeof(unsigned long), | |
339 | .align = __alignof__(unsigned long), | |
340 | }, | |
68b63f08 OS |
341 | [IPSET_EXT_ID_COMMENT] = { |
342 | .type = IPSET_EXT_COMMENT | IPSET_EXT_DESTROY, | |
343 | .flag = IPSET_FLAG_WITH_COMMENT, | |
344 | .len = sizeof(struct ip_set_comment), | |
345 | .align = __alignof__(struct ip_set_comment), | |
346 | .destroy = (destroyer) ip_set_comment_free, | |
347 | }, | |
03c8b234 JK |
348 | }; |
349 | EXPORT_SYMBOL_GPL(ip_set_extensions); | |
350 | ||
351 | static inline bool | |
352 | add_extension(enum ip_set_ext_id id, u32 flags, struct nlattr *tb[]) | |
353 | { | |
354 | return ip_set_extensions[id].flag ? | |
355 | (flags & ip_set_extensions[id].flag) : | |
356 | !!tb[IPSET_ATTR_TIMEOUT]; | |
357 | } | |
358 | ||
359 | size_t | |
360 | ip_set_elem_len(struct ip_set *set, struct nlattr *tb[], size_t len) | |
361 | { | |
362 | enum ip_set_ext_id id; | |
363 | size_t offset = 0; | |
364 | u32 cadt_flags = 0; | |
365 | ||
366 | if (tb[IPSET_ATTR_CADT_FLAGS]) | |
367 | cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); | |
07cf8f5a JH |
368 | if (cadt_flags & IPSET_FLAG_WITH_FORCEADD) |
369 | set->flags |= IPSET_CREATE_FLAG_FORCEADD; | |
03c8b234 JK |
370 | for (id = 0; id < IPSET_EXT_ID_MAX; id++) { |
371 | if (!add_extension(id, cadt_flags, tb)) | |
372 | continue; | |
373 | offset += ALIGN(len + offset, ip_set_extensions[id].align); | |
374 | set->offset[id] = offset; | |
375 | set->extensions |= ip_set_extensions[id].type; | |
376 | offset += ip_set_extensions[id].len; | |
377 | } | |
378 | return len + offset; | |
379 | } | |
380 | EXPORT_SYMBOL_GPL(ip_set_elem_len); | |
381 | ||
075e64c0 JK |
382 | int |
383 | ip_set_get_extensions(struct ip_set *set, struct nlattr *tb[], | |
384 | struct ip_set_ext *ext) | |
385 | { | |
386 | if (tb[IPSET_ATTR_TIMEOUT]) { | |
387 | if (!(set->extensions & IPSET_EXT_TIMEOUT)) | |
388 | return -IPSET_ERR_TIMEOUT; | |
389 | ext->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); | |
390 | } | |
34d666d4 JK |
391 | if (tb[IPSET_ATTR_BYTES] || tb[IPSET_ATTR_PACKETS]) { |
392 | if (!(set->extensions & IPSET_EXT_COUNTER)) | |
393 | return -IPSET_ERR_COUNTER; | |
394 | if (tb[IPSET_ATTR_BYTES]) | |
395 | ext->bytes = be64_to_cpu(nla_get_be64( | |
396 | tb[IPSET_ATTR_BYTES])); | |
397 | if (tb[IPSET_ATTR_PACKETS]) | |
398 | ext->packets = be64_to_cpu(nla_get_be64( | |
399 | tb[IPSET_ATTR_PACKETS])); | |
400 | } | |
68b63f08 OS |
401 | if (tb[IPSET_ATTR_COMMENT]) { |
402 | if (!(set->extensions & IPSET_EXT_COMMENT)) | |
403 | return -IPSET_ERR_COMMENT; | |
404 | ext->comment = ip_set_comment_uget(tb[IPSET_ATTR_COMMENT]); | |
405 | } | |
406 | ||
075e64c0 JK |
407 | return 0; |
408 | } | |
409 | EXPORT_SYMBOL_GPL(ip_set_get_extensions); | |
410 | ||
a7b4f989 JK |
411 | /* |
412 | * Creating/destroying/renaming/swapping affect the existence and | |
413 | * the properties of a set. All of these can be executed from userspace | |
414 | * only and serialized by the nfnl mutex indirectly from nfnetlink. | |
415 | * | |
416 | * Sets are identified by their index in ip_set_list and the index | |
417 | * is used by the external references (set/SET netfilter modules). | |
418 | * | |
419 | * The set behind an index may change by swapping only, from userspace. | |
420 | */ | |
421 | ||
422 | static inline void | |
9076aea7 | 423 | __ip_set_get(struct ip_set *set) |
a7b4f989 | 424 | { |
2f9f28b2 | 425 | write_lock_bh(&ip_set_ref_lock); |
9076aea7 | 426 | set->ref++; |
2f9f28b2 | 427 | write_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
428 | } |
429 | ||
430 | static inline void | |
9076aea7 | 431 | __ip_set_put(struct ip_set *set) |
a7b4f989 | 432 | { |
2f9f28b2 | 433 | write_lock_bh(&ip_set_ref_lock); |
9076aea7 JK |
434 | BUG_ON(set->ref == 0); |
435 | set->ref--; | |
2f9f28b2 | 436 | write_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
437 | } |
438 | ||
439 | /* | |
440 | * Add, del and test set entries from kernel. | |
441 | * | |
442 | * The set behind the index must exist and must be referenced | |
443 | * so it can't be destroyed (or changed) under our foot. | |
444 | */ | |
445 | ||
9076aea7 | 446 | static inline struct ip_set * |
1785e8f4 | 447 | ip_set_rcu_get(struct net *net, ip_set_id_t index) |
9076aea7 JK |
448 | { |
449 | struct ip_set *set; | |
1785e8f4 | 450 | struct ip_set_net *inst = ip_set_pernet(net); |
9076aea7 JK |
451 | |
452 | rcu_read_lock(); | |
453 | /* ip_set_list itself needs to be protected */ | |
1785e8f4 | 454 | set = rcu_dereference(inst->ip_set_list)[index]; |
9076aea7 JK |
455 | rcu_read_unlock(); |
456 | ||
457 | return set; | |
458 | } | |
459 | ||
a7b4f989 JK |
460 | int |
461 | ip_set_test(ip_set_id_t index, const struct sk_buff *skb, | |
075e64c0 | 462 | const struct xt_action_param *par, struct ip_set_adt_opt *opt) |
a7b4f989 | 463 | { |
1785e8f4 VL |
464 | struct ip_set *set = ip_set_rcu_get( |
465 | dev_net(par->in ? par->in : par->out), index); | |
a7b4f989 JK |
466 | int ret = 0; |
467 | ||
2f9f28b2 | 468 | BUG_ON(set == NULL); |
a7b4f989 JK |
469 | pr_debug("set %s, index %u\n", set->name, index); |
470 | ||
ac8cc925 | 471 | if (opt->dim < set->type->dimension || |
c15f1c83 | 472 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
a7b4f989 JK |
473 | return 0; |
474 | ||
475 | read_lock_bh(&set->lock); | |
b66554cf | 476 | ret = set->variant->kadt(set, skb, par, IPSET_TEST, opt); |
a7b4f989 JK |
477 | read_unlock_bh(&set->lock); |
478 | ||
479 | if (ret == -EAGAIN) { | |
480 | /* Type requests element to be completed */ | |
481 | pr_debug("element must be competed, ADD is triggered\n"); | |
482 | write_lock_bh(&set->lock); | |
b66554cf | 483 | set->variant->kadt(set, skb, par, IPSET_ADD, opt); |
a7b4f989 JK |
484 | write_unlock_bh(&set->lock); |
485 | ret = 1; | |
3e0304a5 JK |
486 | } else { |
487 | /* --return-nomatch: invert matched element */ | |
6e01781d | 488 | if ((opt->cmdflags & IPSET_FLAG_RETURN_NOMATCH) && |
3e0304a5 JK |
489 | (set->type->features & IPSET_TYPE_NOMATCH) && |
490 | (ret > 0 || ret == -ENOTEMPTY)) | |
491 | ret = -ret; | |
a7b4f989 JK |
492 | } |
493 | ||
494 | /* Convert error codes to nomatch */ | |
495 | return (ret < 0 ? 0 : ret); | |
496 | } | |
497 | EXPORT_SYMBOL_GPL(ip_set_test); | |
498 | ||
499 | int | |
500 | ip_set_add(ip_set_id_t index, const struct sk_buff *skb, | |
075e64c0 | 501 | const struct xt_action_param *par, struct ip_set_adt_opt *opt) |
a7b4f989 | 502 | { |
1785e8f4 VL |
503 | struct ip_set *set = ip_set_rcu_get( |
504 | dev_net(par->in ? par->in : par->out), index); | |
a7b4f989 JK |
505 | int ret; |
506 | ||
2f9f28b2 | 507 | BUG_ON(set == NULL); |
a7b4f989 JK |
508 | pr_debug("set %s, index %u\n", set->name, index); |
509 | ||
ac8cc925 | 510 | if (opt->dim < set->type->dimension || |
c15f1c83 | 511 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
35f6e63a | 512 | return -IPSET_ERR_TYPE_MISMATCH; |
a7b4f989 JK |
513 | |
514 | write_lock_bh(&set->lock); | |
b66554cf | 515 | ret = set->variant->kadt(set, skb, par, IPSET_ADD, opt); |
a7b4f989 JK |
516 | write_unlock_bh(&set->lock); |
517 | ||
518 | return ret; | |
519 | } | |
520 | EXPORT_SYMBOL_GPL(ip_set_add); | |
521 | ||
522 | int | |
523 | ip_set_del(ip_set_id_t index, const struct sk_buff *skb, | |
075e64c0 | 524 | const struct xt_action_param *par, struct ip_set_adt_opt *opt) |
a7b4f989 | 525 | { |
1785e8f4 VL |
526 | struct ip_set *set = ip_set_rcu_get( |
527 | dev_net(par->in ? par->in : par->out), index); | |
a7b4f989 JK |
528 | int ret = 0; |
529 | ||
2f9f28b2 | 530 | BUG_ON(set == NULL); |
a7b4f989 JK |
531 | pr_debug("set %s, index %u\n", set->name, index); |
532 | ||
ac8cc925 | 533 | if (opt->dim < set->type->dimension || |
c15f1c83 | 534 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
35f6e63a | 535 | return -IPSET_ERR_TYPE_MISMATCH; |
a7b4f989 JK |
536 | |
537 | write_lock_bh(&set->lock); | |
b66554cf | 538 | ret = set->variant->kadt(set, skb, par, IPSET_DEL, opt); |
a7b4f989 JK |
539 | write_unlock_bh(&set->lock); |
540 | ||
541 | return ret; | |
542 | } | |
543 | EXPORT_SYMBOL_GPL(ip_set_del); | |
544 | ||
545 | /* | |
546 | * Find set by name, reference it once. The reference makes sure the | |
547 | * thing pointed to, does not go away under our feet. | |
548 | * | |
a7b4f989 JK |
549 | */ |
550 | ip_set_id_t | |
1785e8f4 | 551 | ip_set_get_byname(struct net *net, const char *name, struct ip_set **set) |
a7b4f989 JK |
552 | { |
553 | ip_set_id_t i, index = IPSET_INVALID_ID; | |
554 | struct ip_set *s; | |
1785e8f4 | 555 | struct ip_set_net *inst = ip_set_pernet(net); |
a7b4f989 | 556 | |
9076aea7 | 557 | rcu_read_lock(); |
1785e8f4 VL |
558 | for (i = 0; i < inst->ip_set_max; i++) { |
559 | s = rcu_dereference(inst->ip_set_list)[i]; | |
a7b4f989 | 560 | if (s != NULL && STREQ(s->name, name)) { |
9076aea7 | 561 | __ip_set_get(s); |
a7b4f989 JK |
562 | index = i; |
563 | *set = s; | |
9076aea7 | 564 | break; |
a7b4f989 JK |
565 | } |
566 | } | |
9076aea7 | 567 | rcu_read_unlock(); |
a7b4f989 JK |
568 | |
569 | return index; | |
570 | } | |
571 | EXPORT_SYMBOL_GPL(ip_set_get_byname); | |
572 | ||
573 | /* | |
574 | * If the given set pointer points to a valid set, decrement | |
575 | * reference count by 1. The caller shall not assume the index | |
576 | * to be valid, after calling this function. | |
577 | * | |
a7b4f989 | 578 | */ |
1785e8f4 VL |
579 | |
580 | static inline void | |
581 | __ip_set_put_byindex(struct ip_set_net *inst, ip_set_id_t index) | |
a7b4f989 | 582 | { |
9076aea7 JK |
583 | struct ip_set *set; |
584 | ||
585 | rcu_read_lock(); | |
1785e8f4 | 586 | set = rcu_dereference(inst->ip_set_list)[index]; |
9076aea7 JK |
587 | if (set != NULL) |
588 | __ip_set_put(set); | |
589 | rcu_read_unlock(); | |
a7b4f989 | 590 | } |
1785e8f4 VL |
591 | |
592 | void | |
593 | ip_set_put_byindex(struct net *net, ip_set_id_t index) | |
594 | { | |
595 | struct ip_set_net *inst = ip_set_pernet(net); | |
596 | ||
597 | __ip_set_put_byindex(inst, index); | |
598 | } | |
a7b4f989 JK |
599 | EXPORT_SYMBOL_GPL(ip_set_put_byindex); |
600 | ||
601 | /* | |
602 | * Get the name of a set behind a set index. | |
603 | * We assume the set is referenced, so it does exist and | |
604 | * can't be destroyed. The set cannot be renamed due to | |
605 | * the referencing either. | |
606 | * | |
a7b4f989 JK |
607 | */ |
608 | const char * | |
1785e8f4 | 609 | ip_set_name_byindex(struct net *net, ip_set_id_t index) |
a7b4f989 | 610 | { |
1785e8f4 | 611 | const struct ip_set *set = ip_set_rcu_get(net, index); |
a7b4f989 JK |
612 | |
613 | BUG_ON(set == NULL); | |
2f9f28b2 | 614 | BUG_ON(set->ref == 0); |
a7b4f989 JK |
615 | |
616 | /* Referenced, so it's safe */ | |
617 | return set->name; | |
618 | } | |
619 | EXPORT_SYMBOL_GPL(ip_set_name_byindex); | |
620 | ||
621 | /* | |
622 | * Routines to call by external subsystems, which do not | |
623 | * call nfnl_lock for us. | |
624 | */ | |
625 | ||
a7b4f989 JK |
626 | /* |
627 | * Find set by index, reference it once. The reference makes sure the | |
628 | * thing pointed to, does not go away under our feet. | |
629 | * | |
630 | * The nfnl mutex is used in the function. | |
631 | */ | |
632 | ip_set_id_t | |
1785e8f4 | 633 | ip_set_nfnl_get_byindex(struct net *net, ip_set_id_t index) |
a7b4f989 | 634 | { |
9076aea7 | 635 | struct ip_set *set; |
1785e8f4 | 636 | struct ip_set_net *inst = ip_set_pernet(net); |
9076aea7 | 637 | |
1785e8f4 | 638 | if (index > inst->ip_set_max) |
a7b4f989 JK |
639 | return IPSET_INVALID_ID; |
640 | ||
c14b78e7 | 641 | nfnl_lock(NFNL_SUBSYS_IPSET); |
3e90ebd3 | 642 | set = ip_set(inst, index); |
9076aea7 JK |
643 | if (set) |
644 | __ip_set_get(set); | |
a7b4f989 JK |
645 | else |
646 | index = IPSET_INVALID_ID; | |
c14b78e7 | 647 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
648 | |
649 | return index; | |
650 | } | |
651 | EXPORT_SYMBOL_GPL(ip_set_nfnl_get_byindex); | |
652 | ||
653 | /* | |
654 | * If the given set pointer points to a valid set, decrement | |
655 | * reference count by 1. The caller shall not assume the index | |
656 | * to be valid, after calling this function. | |
657 | * | |
658 | * The nfnl mutex is used in the function. | |
659 | */ | |
660 | void | |
1785e8f4 | 661 | ip_set_nfnl_put(struct net *net, ip_set_id_t index) |
a7b4f989 | 662 | { |
9076aea7 | 663 | struct ip_set *set; |
1785e8f4 VL |
664 | struct ip_set_net *inst = ip_set_pernet(net); |
665 | ||
c14b78e7 | 666 | nfnl_lock(NFNL_SUBSYS_IPSET); |
1785e8f4 | 667 | if (!inst->is_deleted) { /* already deleted from ip_set_net_exit() */ |
3e90ebd3 | 668 | set = ip_set(inst, index); |
1785e8f4 VL |
669 | if (set != NULL) |
670 | __ip_set_put(set); | |
671 | } | |
c14b78e7 | 672 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
673 | } |
674 | EXPORT_SYMBOL_GPL(ip_set_nfnl_put); | |
675 | ||
676 | /* | |
677 | * Communication protocol with userspace over netlink. | |
678 | * | |
2f9f28b2 | 679 | * The commands are serialized by the nfnl mutex. |
a7b4f989 JK |
680 | */ |
681 | ||
682 | static inline bool | |
683 | protocol_failed(const struct nlattr * const tb[]) | |
684 | { | |
685 | return !tb[IPSET_ATTR_PROTOCOL] || | |
686 | nla_get_u8(tb[IPSET_ATTR_PROTOCOL]) != IPSET_PROTOCOL; | |
687 | } | |
688 | ||
689 | static inline u32 | |
690 | flag_exist(const struct nlmsghdr *nlh) | |
691 | { | |
692 | return nlh->nlmsg_flags & NLM_F_EXCL ? 0 : IPSET_FLAG_EXIST; | |
693 | } | |
694 | ||
695 | static struct nlmsghdr * | |
15e47304 | 696 | start_msg(struct sk_buff *skb, u32 portid, u32 seq, unsigned int flags, |
a7b4f989 JK |
697 | enum ipset_cmd cmd) |
698 | { | |
699 | struct nlmsghdr *nlh; | |
700 | struct nfgenmsg *nfmsg; | |
701 | ||
15e47304 | 702 | nlh = nlmsg_put(skb, portid, seq, cmd | (NFNL_SUBSYS_IPSET << 8), |
a7b4f989 JK |
703 | sizeof(*nfmsg), flags); |
704 | if (nlh == NULL) | |
705 | return NULL; | |
706 | ||
707 | nfmsg = nlmsg_data(nlh); | |
c15f1c83 | 708 | nfmsg->nfgen_family = NFPROTO_IPV4; |
a7b4f989 JK |
709 | nfmsg->version = NFNETLINK_V0; |
710 | nfmsg->res_id = 0; | |
711 | ||
712 | return nlh; | |
713 | } | |
714 | ||
715 | /* Create a set */ | |
716 | ||
717 | static const struct nla_policy ip_set_create_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
718 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
719 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
720 | .len = IPSET_MAXNAMELEN - 1 }, | |
721 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, | |
722 | .len = IPSET_MAXNAMELEN - 1}, | |
723 | [IPSET_ATTR_REVISION] = { .type = NLA_U8 }, | |
724 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, | |
725 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, | |
726 | }; | |
727 | ||
9076aea7 | 728 | static struct ip_set * |
1785e8f4 | 729 | find_set_and_id(struct ip_set_net *inst, const char *name, ip_set_id_t *id) |
a7b4f989 | 730 | { |
9076aea7 JK |
731 | struct ip_set *set = NULL; |
732 | ip_set_id_t i; | |
a7b4f989 | 733 | |
9076aea7 | 734 | *id = IPSET_INVALID_ID; |
1785e8f4 | 735 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 736 | set = ip_set(inst, i); |
9076aea7 JK |
737 | if (set != NULL && STREQ(set->name, name)) { |
738 | *id = i; | |
739 | break; | |
740 | } | |
a7b4f989 | 741 | } |
9076aea7 | 742 | return (*id == IPSET_INVALID_ID ? NULL : set); |
a7b4f989 JK |
743 | } |
744 | ||
745 | static inline struct ip_set * | |
1785e8f4 | 746 | find_set(struct ip_set_net *inst, const char *name) |
a7b4f989 | 747 | { |
9076aea7 | 748 | ip_set_id_t id; |
a7b4f989 | 749 | |
1785e8f4 | 750 | return find_set_and_id(inst, name, &id); |
a7b4f989 JK |
751 | } |
752 | ||
753 | static int | |
1785e8f4 VL |
754 | find_free_id(struct ip_set_net *inst, const char *name, ip_set_id_t *index, |
755 | struct ip_set **set) | |
a7b4f989 | 756 | { |
9076aea7 | 757 | struct ip_set *s; |
a7b4f989 JK |
758 | ip_set_id_t i; |
759 | ||
760 | *index = IPSET_INVALID_ID; | |
1785e8f4 | 761 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 762 | s = ip_set(inst, i); |
9076aea7 | 763 | if (s == NULL) { |
a7b4f989 JK |
764 | if (*index == IPSET_INVALID_ID) |
765 | *index = i; | |
9076aea7 | 766 | } else if (STREQ(name, s->name)) { |
a7b4f989 | 767 | /* Name clash */ |
9076aea7 | 768 | *set = s; |
a7b4f989 JK |
769 | return -EEXIST; |
770 | } | |
771 | } | |
772 | if (*index == IPSET_INVALID_ID) | |
773 | /* No free slot remained */ | |
774 | return -IPSET_ERR_MAX_SETS; | |
775 | return 0; | |
776 | } | |
777 | ||
d31f4d44 TB |
778 | static int |
779 | ip_set_none(struct sock *ctnl, struct sk_buff *skb, | |
780 | const struct nlmsghdr *nlh, | |
781 | const struct nlattr * const attr[]) | |
782 | { | |
783 | return -EOPNOTSUPP; | |
784 | } | |
785 | ||
a7b4f989 JK |
786 | static int |
787 | ip_set_create(struct sock *ctnl, struct sk_buff *skb, | |
788 | const struct nlmsghdr *nlh, | |
789 | const struct nlattr * const attr[]) | |
790 | { | |
1785e8f4 VL |
791 | struct net *net = sock_net(ctnl); |
792 | struct ip_set_net *inst = ip_set_pernet(net); | |
9846ada1 | 793 | struct ip_set *set, *clash = NULL; |
a7b4f989 JK |
794 | ip_set_id_t index = IPSET_INVALID_ID; |
795 | struct nlattr *tb[IPSET_ATTR_CREATE_MAX+1] = {}; | |
796 | const char *name, *typename; | |
797 | u8 family, revision; | |
798 | u32 flags = flag_exist(nlh); | |
799 | int ret = 0; | |
800 | ||
801 | if (unlikely(protocol_failed(attr) || | |
802 | attr[IPSET_ATTR_SETNAME] == NULL || | |
803 | attr[IPSET_ATTR_TYPENAME] == NULL || | |
804 | attr[IPSET_ATTR_REVISION] == NULL || | |
805 | attr[IPSET_ATTR_FAMILY] == NULL || | |
806 | (attr[IPSET_ATTR_DATA] != NULL && | |
807 | !flag_nested(attr[IPSET_ATTR_DATA])))) | |
808 | return -IPSET_ERR_PROTOCOL; | |
809 | ||
810 | name = nla_data(attr[IPSET_ATTR_SETNAME]); | |
811 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); | |
812 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); | |
813 | revision = nla_get_u8(attr[IPSET_ATTR_REVISION]); | |
814 | pr_debug("setname: %s, typename: %s, family: %s, revision: %u\n", | |
815 | name, typename, family_name(family), revision); | |
816 | ||
817 | /* | |
818 | * First, and without any locks, allocate and initialize | |
819 | * a normal base set structure. | |
820 | */ | |
821 | set = kzalloc(sizeof(struct ip_set), GFP_KERNEL); | |
822 | if (!set) | |
823 | return -ENOMEM; | |
824 | rwlock_init(&set->lock); | |
825 | strlcpy(set->name, name, IPSET_MAXNAMELEN); | |
a7b4f989 | 826 | set->family = family; |
f1e00b39 | 827 | set->revision = revision; |
a7b4f989 JK |
828 | |
829 | /* | |
830 | * Next, check that we know the type, and take | |
831 | * a reference on the type, to make sure it stays available | |
832 | * while constructing our new set. | |
833 | * | |
834 | * After referencing the type, we try to create the type | |
835 | * specific part of the set without holding any locks. | |
836 | */ | |
837 | ret = find_set_type_get(typename, family, revision, &(set->type)); | |
838 | if (ret) | |
839 | goto out; | |
840 | ||
841 | /* | |
842 | * Without holding any locks, create private part. | |
843 | */ | |
844 | if (attr[IPSET_ATTR_DATA] && | |
8da560ce PM |
845 | nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA], |
846 | set->type->create_policy)) { | |
15b4d93f JK |
847 | ret = -IPSET_ERR_PROTOCOL; |
848 | goto put_out; | |
a7b4f989 JK |
849 | } |
850 | ||
1785e8f4 | 851 | ret = set->type->create(net, set, tb, flags); |
a7b4f989 JK |
852 | if (ret != 0) |
853 | goto put_out; | |
854 | ||
855 | /* BTW, ret==0 here. */ | |
856 | ||
857 | /* | |
858 | * Here, we have a valid, constructed set and we are protected | |
2f9f28b2 JK |
859 | * by the nfnl mutex. Find the first free index in ip_set_list |
860 | * and check clashing. | |
a7b4f989 | 861 | */ |
1785e8f4 | 862 | ret = find_free_id(inst, set->name, &index, &clash); |
9076aea7 | 863 | if (ret == -EEXIST) { |
a7b4f989 | 864 | /* If this is the same set and requested, ignore error */ |
9076aea7 | 865 | if ((flags & IPSET_FLAG_EXIST) && |
a7b4f989 JK |
866 | STREQ(set->type->name, clash->type->name) && |
867 | set->type->family == clash->type->family && | |
f1e00b39 JK |
868 | set->type->revision_min == clash->type->revision_min && |
869 | set->type->revision_max == clash->type->revision_max && | |
a7b4f989 JK |
870 | set->variant->same_set(set, clash)) |
871 | ret = 0; | |
872 | goto cleanup; | |
9076aea7 JK |
873 | } else if (ret == -IPSET_ERR_MAX_SETS) { |
874 | struct ip_set **list, **tmp; | |
1785e8f4 | 875 | ip_set_id_t i = inst->ip_set_max + IP_SET_INC; |
9076aea7 | 876 | |
1785e8f4 | 877 | if (i < inst->ip_set_max || i == IPSET_INVALID_ID) |
9076aea7 JK |
878 | /* Wraparound */ |
879 | goto cleanup; | |
880 | ||
881 | list = kzalloc(sizeof(struct ip_set *) * i, GFP_KERNEL); | |
882 | if (!list) | |
883 | goto cleanup; | |
884 | /* nfnl mutex is held, both lists are valid */ | |
3e90ebd3 | 885 | tmp = ip_set_dereference(inst->ip_set_list); |
1785e8f4 VL |
886 | memcpy(list, tmp, sizeof(struct ip_set *) * inst->ip_set_max); |
887 | rcu_assign_pointer(inst->ip_set_list, list); | |
9076aea7 JK |
888 | /* Make sure all current packets have passed through */ |
889 | synchronize_net(); | |
890 | /* Use new list */ | |
1785e8f4 VL |
891 | index = inst->ip_set_max; |
892 | inst->ip_set_max = i; | |
9076aea7 JK |
893 | kfree(tmp); |
894 | ret = 0; | |
895 | } else if (ret) | |
896 | goto cleanup; | |
a7b4f989 JK |
897 | |
898 | /* | |
899 | * Finally! Add our shiny new set to the list, and be done. | |
900 | */ | |
901 | pr_debug("create: '%s' created with index %u!\n", set->name, index); | |
3e90ebd3 | 902 | ip_set(inst, index) = set; |
a7b4f989 JK |
903 | |
904 | return ret; | |
905 | ||
906 | cleanup: | |
907 | set->variant->destroy(set); | |
908 | put_out: | |
909 | module_put(set->type->me); | |
910 | out: | |
911 | kfree(set); | |
912 | return ret; | |
913 | } | |
914 | ||
915 | /* Destroy sets */ | |
916 | ||
917 | static const struct nla_policy | |
918 | ip_set_setname_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
919 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
920 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
921 | .len = IPSET_MAXNAMELEN - 1 }, | |
922 | }; | |
923 | ||
924 | static void | |
1785e8f4 | 925 | ip_set_destroy_set(struct ip_set_net *inst, ip_set_id_t index) |
a7b4f989 | 926 | { |
3e90ebd3 | 927 | struct ip_set *set = ip_set(inst, index); |
a7b4f989 JK |
928 | |
929 | pr_debug("set: %s\n", set->name); | |
3e90ebd3 | 930 | ip_set(inst, index) = NULL; |
a7b4f989 JK |
931 | |
932 | /* Must call it without holding any lock */ | |
933 | set->variant->destroy(set); | |
934 | module_put(set->type->me); | |
935 | kfree(set); | |
936 | } | |
937 | ||
938 | static int | |
939 | ip_set_destroy(struct sock *ctnl, struct sk_buff *skb, | |
940 | const struct nlmsghdr *nlh, | |
941 | const struct nlattr * const attr[]) | |
942 | { | |
1785e8f4 | 943 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
9076aea7 | 944 | struct ip_set *s; |
a7b4f989 | 945 | ip_set_id_t i; |
2f9f28b2 | 946 | int ret = 0; |
a7b4f989 JK |
947 | |
948 | if (unlikely(protocol_failed(attr))) | |
949 | return -IPSET_ERR_PROTOCOL; | |
950 | ||
2f9f28b2 JK |
951 | /* Commands are serialized and references are |
952 | * protected by the ip_set_ref_lock. | |
953 | * External systems (i.e. xt_set) must call | |
954 | * ip_set_put|get_nfnl_* functions, that way we | |
955 | * can safely check references here. | |
956 | * | |
957 | * list:set timer can only decrement the reference | |
958 | * counter, so if it's already zero, we can proceed | |
959 | * without holding the lock. | |
960 | */ | |
961 | read_lock_bh(&ip_set_ref_lock); | |
a7b4f989 | 962 | if (!attr[IPSET_ATTR_SETNAME]) { |
1785e8f4 | 963 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 964 | s = ip_set(inst, i); |
9076aea7 | 965 | if (s != NULL && s->ref) { |
9d883232 | 966 | ret = -IPSET_ERR_BUSY; |
2f9f28b2 JK |
967 | goto out; |
968 | } | |
a7b4f989 | 969 | } |
2f9f28b2 | 970 | read_unlock_bh(&ip_set_ref_lock); |
1785e8f4 | 971 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 972 | s = ip_set(inst, i); |
9076aea7 | 973 | if (s != NULL) |
1785e8f4 | 974 | ip_set_destroy_set(inst, i); |
a7b4f989 JK |
975 | } |
976 | } else { | |
1785e8f4 VL |
977 | s = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), |
978 | &i); | |
9076aea7 | 979 | if (s == NULL) { |
2f9f28b2 JK |
980 | ret = -ENOENT; |
981 | goto out; | |
9076aea7 | 982 | } else if (s->ref) { |
2f9f28b2 JK |
983 | ret = -IPSET_ERR_BUSY; |
984 | goto out; | |
985 | } | |
986 | read_unlock_bh(&ip_set_ref_lock); | |
a7b4f989 | 987 | |
1785e8f4 | 988 | ip_set_destroy_set(inst, i); |
a7b4f989 JK |
989 | } |
990 | return 0; | |
2f9f28b2 JK |
991 | out: |
992 | read_unlock_bh(&ip_set_ref_lock); | |
993 | return ret; | |
a7b4f989 JK |
994 | } |
995 | ||
996 | /* Flush sets */ | |
997 | ||
998 | static void | |
999 | ip_set_flush_set(struct ip_set *set) | |
1000 | { | |
1001 | pr_debug("set: %s\n", set->name); | |
1002 | ||
1003 | write_lock_bh(&set->lock); | |
1004 | set->variant->flush(set); | |
1005 | write_unlock_bh(&set->lock); | |
1006 | } | |
1007 | ||
1008 | static int | |
1009 | ip_set_flush(struct sock *ctnl, struct sk_buff *skb, | |
1010 | const struct nlmsghdr *nlh, | |
1011 | const struct nlattr * const attr[]) | |
1012 | { | |
1785e8f4 | 1013 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
9076aea7 | 1014 | struct ip_set *s; |
a7b4f989 JK |
1015 | ip_set_id_t i; |
1016 | ||
1017 | if (unlikely(protocol_failed(attr))) | |
9184a9cb | 1018 | return -IPSET_ERR_PROTOCOL; |
a7b4f989 JK |
1019 | |
1020 | if (!attr[IPSET_ATTR_SETNAME]) { | |
1785e8f4 | 1021 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 1022 | s = ip_set(inst, i); |
9076aea7 JK |
1023 | if (s != NULL) |
1024 | ip_set_flush_set(s); | |
1025 | } | |
a7b4f989 | 1026 | } else { |
1785e8f4 | 1027 | s = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
9076aea7 | 1028 | if (s == NULL) |
a7b4f989 JK |
1029 | return -ENOENT; |
1030 | ||
9076aea7 | 1031 | ip_set_flush_set(s); |
a7b4f989 JK |
1032 | } |
1033 | ||
1034 | return 0; | |
1035 | } | |
1036 | ||
1037 | /* Rename a set */ | |
1038 | ||
1039 | static const struct nla_policy | |
1040 | ip_set_setname2_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1041 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1042 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
1043 | .len = IPSET_MAXNAMELEN - 1 }, | |
1044 | [IPSET_ATTR_SETNAME2] = { .type = NLA_NUL_STRING, | |
1045 | .len = IPSET_MAXNAMELEN - 1 }, | |
1046 | }; | |
1047 | ||
1048 | static int | |
1049 | ip_set_rename(struct sock *ctnl, struct sk_buff *skb, | |
1050 | const struct nlmsghdr *nlh, | |
1051 | const struct nlattr * const attr[]) | |
1052 | { | |
1785e8f4 | 1053 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
9076aea7 | 1054 | struct ip_set *set, *s; |
a7b4f989 JK |
1055 | const char *name2; |
1056 | ip_set_id_t i; | |
2f9f28b2 | 1057 | int ret = 0; |
a7b4f989 JK |
1058 | |
1059 | if (unlikely(protocol_failed(attr) || | |
1060 | attr[IPSET_ATTR_SETNAME] == NULL || | |
1061 | attr[IPSET_ATTR_SETNAME2] == NULL)) | |
1062 | return -IPSET_ERR_PROTOCOL; | |
1063 | ||
1785e8f4 | 1064 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
a7b4f989 JK |
1065 | if (set == NULL) |
1066 | return -ENOENT; | |
2f9f28b2 JK |
1067 | |
1068 | read_lock_bh(&ip_set_ref_lock); | |
1069 | if (set->ref != 0) { | |
1070 | ret = -IPSET_ERR_REFERENCED; | |
1071 | goto out; | |
1072 | } | |
a7b4f989 JK |
1073 | |
1074 | name2 = nla_data(attr[IPSET_ATTR_SETNAME2]); | |
1785e8f4 | 1075 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 1076 | s = ip_set(inst, i); |
9076aea7 | 1077 | if (s != NULL && STREQ(s->name, name2)) { |
2f9f28b2 JK |
1078 | ret = -IPSET_ERR_EXIST_SETNAME2; |
1079 | goto out; | |
1080 | } | |
a7b4f989 JK |
1081 | } |
1082 | strncpy(set->name, name2, IPSET_MAXNAMELEN); | |
1083 | ||
2f9f28b2 JK |
1084 | out: |
1085 | read_unlock_bh(&ip_set_ref_lock); | |
1086 | return ret; | |
a7b4f989 JK |
1087 | } |
1088 | ||
1089 | /* Swap two sets so that name/index points to the other. | |
1090 | * References and set names are also swapped. | |
1091 | * | |
2f9f28b2 JK |
1092 | * The commands are serialized by the nfnl mutex and references are |
1093 | * protected by the ip_set_ref_lock. The kernel interfaces | |
a7b4f989 JK |
1094 | * do not hold the mutex but the pointer settings are atomic |
1095 | * so the ip_set_list always contains valid pointers to the sets. | |
1096 | */ | |
1097 | ||
1098 | static int | |
1099 | ip_set_swap(struct sock *ctnl, struct sk_buff *skb, | |
1100 | const struct nlmsghdr *nlh, | |
1101 | const struct nlattr * const attr[]) | |
1102 | { | |
1785e8f4 | 1103 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
a7b4f989 JK |
1104 | struct ip_set *from, *to; |
1105 | ip_set_id_t from_id, to_id; | |
1106 | char from_name[IPSET_MAXNAMELEN]; | |
a7b4f989 JK |
1107 | |
1108 | if (unlikely(protocol_failed(attr) || | |
1109 | attr[IPSET_ATTR_SETNAME] == NULL || | |
1110 | attr[IPSET_ATTR_SETNAME2] == NULL)) | |
1111 | return -IPSET_ERR_PROTOCOL; | |
1112 | ||
1785e8f4 VL |
1113 | from = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), |
1114 | &from_id); | |
9076aea7 | 1115 | if (from == NULL) |
a7b4f989 JK |
1116 | return -ENOENT; |
1117 | ||
1785e8f4 VL |
1118 | to = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME2]), |
1119 | &to_id); | |
9076aea7 | 1120 | if (to == NULL) |
a7b4f989 JK |
1121 | return -IPSET_ERR_EXIST_SETNAME2; |
1122 | ||
a7b4f989 | 1123 | /* Features must not change. |
25985edc | 1124 | * Not an artificial restriction anymore, as we must prevent |
a7b4f989 JK |
1125 | * possible loops created by swapping in setlist type of sets. */ |
1126 | if (!(from->type->features == to->type->features && | |
169faa2e | 1127 | from->family == to->family)) |
a7b4f989 JK |
1128 | return -IPSET_ERR_TYPE_MISMATCH; |
1129 | ||
a7b4f989 | 1130 | strncpy(from_name, from->name, IPSET_MAXNAMELEN); |
a7b4f989 | 1131 | strncpy(from->name, to->name, IPSET_MAXNAMELEN); |
a7b4f989 | 1132 | strncpy(to->name, from_name, IPSET_MAXNAMELEN); |
a7b4f989 | 1133 | |
2f9f28b2 JK |
1134 | write_lock_bh(&ip_set_ref_lock); |
1135 | swap(from->ref, to->ref); | |
3e90ebd3 PM |
1136 | ip_set(inst, from_id) = to; |
1137 | ip_set(inst, to_id) = from; | |
2f9f28b2 | 1138 | write_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
1139 | |
1140 | return 0; | |
1141 | } | |
1142 | ||
1143 | /* List/save set data */ | |
1144 | ||
c1e2e043 JK |
1145 | #define DUMP_INIT 0 |
1146 | #define DUMP_ALL 1 | |
1147 | #define DUMP_ONE 2 | |
1148 | #define DUMP_LAST 3 | |
1149 | ||
1150 | #define DUMP_TYPE(arg) (((u32)(arg)) & 0x0000FFFF) | |
1151 | #define DUMP_FLAGS(arg) (((u32)(arg)) >> 16) | |
a7b4f989 JK |
1152 | |
1153 | static int | |
1154 | ip_set_dump_done(struct netlink_callback *cb) | |
1155 | { | |
93302880 JK |
1156 | struct ip_set_net *inst = (struct ip_set_net *)cb->args[IPSET_CB_NET]; |
1157 | if (cb->args[IPSET_CB_ARG0]) { | |
1158 | pr_debug("release set %s\n", | |
3e90ebd3 | 1159 | ip_set(inst, cb->args[IPSET_CB_INDEX])->name); |
93302880 JK |
1160 | __ip_set_put_byindex(inst, |
1161 | (ip_set_id_t) cb->args[IPSET_CB_INDEX]); | |
a7b4f989 JK |
1162 | } |
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | static inline void | |
1167 | dump_attrs(struct nlmsghdr *nlh) | |
1168 | { | |
1169 | const struct nlattr *attr; | |
1170 | int rem; | |
1171 | ||
1172 | pr_debug("dump nlmsg\n"); | |
1173 | nlmsg_for_each_attr(attr, nlh, sizeof(struct nfgenmsg), rem) { | |
1174 | pr_debug("type: %u, len %u\n", nla_type(attr), attr->nla_len); | |
1175 | } | |
1176 | } | |
1177 | ||
1178 | static int | |
93302880 | 1179 | dump_init(struct netlink_callback *cb, struct ip_set_net *inst) |
a7b4f989 JK |
1180 | { |
1181 | struct nlmsghdr *nlh = nlmsg_hdr(cb->skb); | |
573ce260 | 1182 | int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); |
a7b4f989 JK |
1183 | struct nlattr *cda[IPSET_ATTR_CMD_MAX+1]; |
1184 | struct nlattr *attr = (void *)nlh + min_len; | |
c1e2e043 | 1185 | u32 dump_type; |
a7b4f989 JK |
1186 | ip_set_id_t index; |
1187 | ||
1188 | /* Second pass, so parser can't fail */ | |
1189 | nla_parse(cda, IPSET_ATTR_CMD_MAX, | |
1190 | attr, nlh->nlmsg_len - min_len, ip_set_setname_policy); | |
1191 | ||
93302880 JK |
1192 | /* cb->args[IPSET_CB_NET]: net namespace |
1193 | * [IPSET_CB_DUMP]: dump single set/all sets | |
1194 | * [IPSET_CB_INDEX]: set index | |
1195 | * [IPSET_CB_ARG0]: type specific | |
a7b4f989 JK |
1196 | */ |
1197 | ||
c1e2e043 | 1198 | if (cda[IPSET_ATTR_SETNAME]) { |
9076aea7 JK |
1199 | struct ip_set *set; |
1200 | ||
1785e8f4 | 1201 | set = find_set_and_id(inst, nla_data(cda[IPSET_ATTR_SETNAME]), |
9076aea7 JK |
1202 | &index); |
1203 | if (set == NULL) | |
c1e2e043 | 1204 | return -ENOENT; |
a7b4f989 | 1205 | |
c1e2e043 | 1206 | dump_type = DUMP_ONE; |
93302880 | 1207 | cb->args[IPSET_CB_INDEX] = index; |
c1e2e043 JK |
1208 | } else |
1209 | dump_type = DUMP_ALL; | |
1210 | ||
1211 | if (cda[IPSET_ATTR_FLAGS]) { | |
1212 | u32 f = ip_set_get_h32(cda[IPSET_ATTR_FLAGS]); | |
1213 | dump_type |= (f << 16); | |
1214 | } | |
93302880 JK |
1215 | cb->args[IPSET_CB_NET] = (unsigned long)inst; |
1216 | cb->args[IPSET_CB_DUMP] = dump_type; | |
a7b4f989 | 1217 | |
a7b4f989 JK |
1218 | return 0; |
1219 | } | |
1220 | ||
1221 | static int | |
1222 | ip_set_dump_start(struct sk_buff *skb, struct netlink_callback *cb) | |
1223 | { | |
1224 | ip_set_id_t index = IPSET_INVALID_ID, max; | |
1225 | struct ip_set *set = NULL; | |
1226 | struct nlmsghdr *nlh = NULL; | |
15e47304 | 1227 | unsigned int flags = NETLINK_CB(cb->skb).portid ? NLM_F_MULTI : 0; |
93302880 | 1228 | struct ip_set_net *inst = ip_set_pernet(sock_net(skb->sk)); |
c1e2e043 | 1229 | u32 dump_type, dump_flags; |
a7b4f989 JK |
1230 | int ret = 0; |
1231 | ||
93302880 JK |
1232 | if (!cb->args[IPSET_CB_DUMP]) { |
1233 | ret = dump_init(cb, inst); | |
a7b4f989 JK |
1234 | if (ret < 0) { |
1235 | nlh = nlmsg_hdr(cb->skb); | |
1236 | /* We have to create and send the error message | |
1237 | * manually :-( */ | |
1238 | if (nlh->nlmsg_flags & NLM_F_ACK) | |
1239 | netlink_ack(cb->skb, nlh, ret); | |
1240 | return ret; | |
1241 | } | |
1242 | } | |
1243 | ||
93302880 | 1244 | if (cb->args[IPSET_CB_INDEX] >= inst->ip_set_max) |
a7b4f989 JK |
1245 | goto out; |
1246 | ||
93302880 JK |
1247 | dump_type = DUMP_TYPE(cb->args[IPSET_CB_DUMP]); |
1248 | dump_flags = DUMP_FLAGS(cb->args[IPSET_CB_DUMP]); | |
1249 | max = dump_type == DUMP_ONE ? cb->args[IPSET_CB_INDEX] + 1 | |
1250 | : inst->ip_set_max; | |
a8a8a093 | 1251 | dump_last: |
93302880 JK |
1252 | pr_debug("dump type, flag: %u %u index: %ld\n", |
1253 | dump_type, dump_flags, cb->args[IPSET_CB_INDEX]); | |
1254 | for (; cb->args[IPSET_CB_INDEX] < max; cb->args[IPSET_CB_INDEX]++) { | |
1255 | index = (ip_set_id_t) cb->args[IPSET_CB_INDEX]; | |
3e90ebd3 | 1256 | set = ip_set(inst, index); |
a7b4f989 | 1257 | if (set == NULL) { |
c1e2e043 | 1258 | if (dump_type == DUMP_ONE) { |
a7b4f989 JK |
1259 | ret = -ENOENT; |
1260 | goto out; | |
1261 | } | |
1262 | continue; | |
1263 | } | |
1264 | /* When dumping all sets, we must dump "sorted" | |
1265 | * so that lists (unions of sets) are dumped last. | |
1266 | */ | |
c1e2e043 JK |
1267 | if (dump_type != DUMP_ONE && |
1268 | ((dump_type == DUMP_ALL) == | |
a8a8a093 | 1269 | !!(set->type->features & IPSET_DUMP_LAST))) |
a7b4f989 JK |
1270 | continue; |
1271 | pr_debug("List set: %s\n", set->name); | |
93302880 | 1272 | if (!cb->args[IPSET_CB_ARG0]) { |
a7b4f989 JK |
1273 | /* Start listing: make sure set won't be destroyed */ |
1274 | pr_debug("reference set\n"); | |
9076aea7 | 1275 | __ip_set_get(set); |
a7b4f989 | 1276 | } |
15e47304 | 1277 | nlh = start_msg(skb, NETLINK_CB(cb->skb).portid, |
a7b4f989 JK |
1278 | cb->nlh->nlmsg_seq, flags, |
1279 | IPSET_CMD_LIST); | |
1280 | if (!nlh) { | |
1281 | ret = -EMSGSIZE; | |
1282 | goto release_refcount; | |
1283 | } | |
7cf7899d DM |
1284 | if (nla_put_u8(skb, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || |
1285 | nla_put_string(skb, IPSET_ATTR_SETNAME, set->name)) | |
1286 | goto nla_put_failure; | |
c1e2e043 JK |
1287 | if (dump_flags & IPSET_FLAG_LIST_SETNAME) |
1288 | goto next_set; | |
93302880 | 1289 | switch (cb->args[IPSET_CB_ARG0]) { |
a7b4f989 JK |
1290 | case 0: |
1291 | /* Core header data */ | |
7cf7899d DM |
1292 | if (nla_put_string(skb, IPSET_ATTR_TYPENAME, |
1293 | set->type->name) || | |
1294 | nla_put_u8(skb, IPSET_ATTR_FAMILY, | |
1295 | set->family) || | |
1296 | nla_put_u8(skb, IPSET_ATTR_REVISION, | |
1297 | set->revision)) | |
1298 | goto nla_put_failure; | |
a7b4f989 JK |
1299 | ret = set->variant->head(set, skb); |
1300 | if (ret < 0) | |
1301 | goto release_refcount; | |
c1e2e043 JK |
1302 | if (dump_flags & IPSET_FLAG_LIST_HEADER) |
1303 | goto next_set; | |
a7b4f989 JK |
1304 | /* Fall through and add elements */ |
1305 | default: | |
1306 | read_lock_bh(&set->lock); | |
1307 | ret = set->variant->list(set, skb, cb); | |
1308 | read_unlock_bh(&set->lock); | |
93302880 | 1309 | if (!cb->args[IPSET_CB_ARG0]) |
a7b4f989 | 1310 | /* Set is done, proceed with next one */ |
c1e2e043 | 1311 | goto next_set; |
a7b4f989 JK |
1312 | goto release_refcount; |
1313 | } | |
1314 | } | |
a8a8a093 | 1315 | /* If we dump all sets, continue with dumping last ones */ |
c1e2e043 JK |
1316 | if (dump_type == DUMP_ALL) { |
1317 | dump_type = DUMP_LAST; | |
93302880 JK |
1318 | cb->args[IPSET_CB_DUMP] = dump_type | (dump_flags << 16); |
1319 | cb->args[IPSET_CB_INDEX] = 0; | |
a8a8a093 JK |
1320 | goto dump_last; |
1321 | } | |
a7b4f989 JK |
1322 | goto out; |
1323 | ||
1324 | nla_put_failure: | |
1325 | ret = -EFAULT; | |
c1e2e043 JK |
1326 | next_set: |
1327 | if (dump_type == DUMP_ONE) | |
93302880 | 1328 | cb->args[IPSET_CB_INDEX] = IPSET_INVALID_ID; |
c1e2e043 | 1329 | else |
93302880 | 1330 | cb->args[IPSET_CB_INDEX]++; |
a7b4f989 JK |
1331 | release_refcount: |
1332 | /* If there was an error or set is done, release set */ | |
93302880 | 1333 | if (ret || !cb->args[IPSET_CB_ARG0]) { |
3e90ebd3 | 1334 | pr_debug("release set %s\n", ip_set(inst, index)->name); |
1785e8f4 | 1335 | __ip_set_put_byindex(inst, index); |
93302880 | 1336 | cb->args[IPSET_CB_ARG0] = 0; |
a7b4f989 | 1337 | } |
a7b4f989 JK |
1338 | out: |
1339 | if (nlh) { | |
1340 | nlmsg_end(skb, nlh); | |
1341 | pr_debug("nlmsg_len: %u\n", nlh->nlmsg_len); | |
1342 | dump_attrs(nlh); | |
1343 | } | |
1344 | ||
1345 | return ret < 0 ? ret : skb->len; | |
1346 | } | |
1347 | ||
1348 | static int | |
1349 | ip_set_dump(struct sock *ctnl, struct sk_buff *skb, | |
1350 | const struct nlmsghdr *nlh, | |
1351 | const struct nlattr * const attr[]) | |
1352 | { | |
1353 | if (unlikely(protocol_failed(attr))) | |
1354 | return -IPSET_ERR_PROTOCOL; | |
1355 | ||
80d326fa PNA |
1356 | { |
1357 | struct netlink_dump_control c = { | |
1358 | .dump = ip_set_dump_start, | |
1359 | .done = ip_set_dump_done, | |
1360 | }; | |
1361 | return netlink_dump_start(ctnl, skb, nlh, &c); | |
1362 | } | |
a7b4f989 JK |
1363 | } |
1364 | ||
1365 | /* Add, del and test */ | |
1366 | ||
1367 | static const struct nla_policy ip_set_adt_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1368 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1369 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
1370 | .len = IPSET_MAXNAMELEN - 1 }, | |
1371 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, | |
1372 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, | |
1373 | [IPSET_ATTR_ADT] = { .type = NLA_NESTED }, | |
1374 | }; | |
1375 | ||
1376 | static int | |
5f52bc3c | 1377 | call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set, |
a7b4f989 JK |
1378 | struct nlattr *tb[], enum ipset_adt adt, |
1379 | u32 flags, bool use_lineno) | |
1380 | { | |
3d14b171 | 1381 | int ret; |
a7b4f989 | 1382 | u32 lineno = 0; |
3d14b171 | 1383 | bool eexist = flags & IPSET_FLAG_EXIST, retried = false; |
a7b4f989 JK |
1384 | |
1385 | do { | |
1386 | write_lock_bh(&set->lock); | |
3d14b171 | 1387 | ret = set->variant->uadt(set, tb, adt, &lineno, flags, retried); |
a7b4f989 | 1388 | write_unlock_bh(&set->lock); |
3d14b171 | 1389 | retried = true; |
a7b4f989 JK |
1390 | } while (ret == -EAGAIN && |
1391 | set->variant->resize && | |
3d14b171 | 1392 | (ret = set->variant->resize(set, retried)) == 0); |
a7b4f989 JK |
1393 | |
1394 | if (!ret || (ret == -IPSET_ERR_EXIST && eexist)) | |
1395 | return 0; | |
1396 | if (lineno && use_lineno) { | |
1397 | /* Error in restore/batch mode: send back lineno */ | |
5f52bc3c JK |
1398 | struct nlmsghdr *rep, *nlh = nlmsg_hdr(skb); |
1399 | struct sk_buff *skb2; | |
1400 | struct nlmsgerr *errmsg; | |
1401 | size_t payload = sizeof(*errmsg) + nlmsg_len(nlh); | |
573ce260 | 1402 | int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); |
a7b4f989 | 1403 | struct nlattr *cda[IPSET_ATTR_CMD_MAX+1]; |
5f52bc3c | 1404 | struct nlattr *cmdattr; |
a7b4f989 JK |
1405 | u32 *errline; |
1406 | ||
5f52bc3c JK |
1407 | skb2 = nlmsg_new(payload, GFP_KERNEL); |
1408 | if (skb2 == NULL) | |
1409 | return -ENOMEM; | |
15e47304 | 1410 | rep = __nlmsg_put(skb2, NETLINK_CB(skb).portid, |
5f52bc3c JK |
1411 | nlh->nlmsg_seq, NLMSG_ERROR, payload, 0); |
1412 | errmsg = nlmsg_data(rep); | |
1413 | errmsg->error = ret; | |
1414 | memcpy(&errmsg->msg, nlh, nlh->nlmsg_len); | |
1415 | cmdattr = (void *)&errmsg->msg + min_len; | |
1416 | ||
a7b4f989 JK |
1417 | nla_parse(cda, IPSET_ATTR_CMD_MAX, |
1418 | cmdattr, nlh->nlmsg_len - min_len, | |
1419 | ip_set_adt_policy); | |
1420 | ||
1421 | errline = nla_data(cda[IPSET_ATTR_LINENO]); | |
1422 | ||
1423 | *errline = lineno; | |
5f52bc3c | 1424 | |
15e47304 | 1425 | netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
5f52bc3c JK |
1426 | /* Signal netlink not to send its ACK/errmsg. */ |
1427 | return -EINTR; | |
a7b4f989 JK |
1428 | } |
1429 | ||
1430 | return ret; | |
1431 | } | |
1432 | ||
1433 | static int | |
1434 | ip_set_uadd(struct sock *ctnl, struct sk_buff *skb, | |
1435 | const struct nlmsghdr *nlh, | |
1436 | const struct nlattr * const attr[]) | |
1437 | { | |
1785e8f4 | 1438 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
a7b4f989 JK |
1439 | struct ip_set *set; |
1440 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; | |
1441 | const struct nlattr *nla; | |
1442 | u32 flags = flag_exist(nlh); | |
1443 | bool use_lineno; | |
1444 | int ret = 0; | |
1445 | ||
1446 | if (unlikely(protocol_failed(attr) || | |
1447 | attr[IPSET_ATTR_SETNAME] == NULL || | |
1448 | !((attr[IPSET_ATTR_DATA] != NULL) ^ | |
1449 | (attr[IPSET_ATTR_ADT] != NULL)) || | |
1450 | (attr[IPSET_ATTR_DATA] != NULL && | |
1451 | !flag_nested(attr[IPSET_ATTR_DATA])) || | |
1452 | (attr[IPSET_ATTR_ADT] != NULL && | |
1453 | (!flag_nested(attr[IPSET_ATTR_ADT]) || | |
1454 | attr[IPSET_ATTR_LINENO] == NULL)))) | |
1455 | return -IPSET_ERR_PROTOCOL; | |
1456 | ||
1785e8f4 | 1457 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
a7b4f989 JK |
1458 | if (set == NULL) |
1459 | return -ENOENT; | |
1460 | ||
1461 | use_lineno = !!attr[IPSET_ATTR_LINENO]; | |
1462 | if (attr[IPSET_ATTR_DATA]) { | |
8da560ce PM |
1463 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
1464 | attr[IPSET_ATTR_DATA], | |
1465 | set->type->adt_policy)) | |
a7b4f989 | 1466 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c JK |
1467 | ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, flags, |
1468 | use_lineno); | |
a7b4f989 JK |
1469 | } else { |
1470 | int nla_rem; | |
1471 | ||
1472 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { | |
1473 | memset(tb, 0, sizeof(tb)); | |
1474 | if (nla_type(nla) != IPSET_ATTR_DATA || | |
1475 | !flag_nested(nla) || | |
8da560ce PM |
1476 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
1477 | set->type->adt_policy)) | |
a7b4f989 | 1478 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c | 1479 | ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, |
a7b4f989 JK |
1480 | flags, use_lineno); |
1481 | if (ret < 0) | |
1482 | return ret; | |
1483 | } | |
1484 | } | |
1485 | return ret; | |
1486 | } | |
1487 | ||
1488 | static int | |
1489 | ip_set_udel(struct sock *ctnl, struct sk_buff *skb, | |
1490 | const struct nlmsghdr *nlh, | |
1491 | const struct nlattr * const attr[]) | |
1492 | { | |
1785e8f4 | 1493 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
a7b4f989 JK |
1494 | struct ip_set *set; |
1495 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; | |
1496 | const struct nlattr *nla; | |
1497 | u32 flags = flag_exist(nlh); | |
1498 | bool use_lineno; | |
1499 | int ret = 0; | |
1500 | ||
1501 | if (unlikely(protocol_failed(attr) || | |
1502 | attr[IPSET_ATTR_SETNAME] == NULL || | |
1503 | !((attr[IPSET_ATTR_DATA] != NULL) ^ | |
1504 | (attr[IPSET_ATTR_ADT] != NULL)) || | |
1505 | (attr[IPSET_ATTR_DATA] != NULL && | |
1506 | !flag_nested(attr[IPSET_ATTR_DATA])) || | |
1507 | (attr[IPSET_ATTR_ADT] != NULL && | |
1508 | (!flag_nested(attr[IPSET_ATTR_ADT]) || | |
1509 | attr[IPSET_ATTR_LINENO] == NULL)))) | |
1510 | return -IPSET_ERR_PROTOCOL; | |
1511 | ||
1785e8f4 | 1512 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
a7b4f989 JK |
1513 | if (set == NULL) |
1514 | return -ENOENT; | |
1515 | ||
1516 | use_lineno = !!attr[IPSET_ATTR_LINENO]; | |
1517 | if (attr[IPSET_ATTR_DATA]) { | |
8da560ce PM |
1518 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
1519 | attr[IPSET_ATTR_DATA], | |
1520 | set->type->adt_policy)) | |
a7b4f989 | 1521 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c JK |
1522 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, flags, |
1523 | use_lineno); | |
a7b4f989 JK |
1524 | } else { |
1525 | int nla_rem; | |
1526 | ||
1527 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { | |
1528 | memset(tb, 0, sizeof(*tb)); | |
1529 | if (nla_type(nla) != IPSET_ATTR_DATA || | |
1530 | !flag_nested(nla) || | |
8da560ce PM |
1531 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
1532 | set->type->adt_policy)) | |
a7b4f989 | 1533 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c | 1534 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, |
a7b4f989 JK |
1535 | flags, use_lineno); |
1536 | if (ret < 0) | |
1537 | return ret; | |
1538 | } | |
1539 | } | |
1540 | return ret; | |
1541 | } | |
1542 | ||
1543 | static int | |
1544 | ip_set_utest(struct sock *ctnl, struct sk_buff *skb, | |
1545 | const struct nlmsghdr *nlh, | |
1546 | const struct nlattr * const attr[]) | |
1547 | { | |
1785e8f4 | 1548 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
a7b4f989 JK |
1549 | struct ip_set *set; |
1550 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; | |
1551 | int ret = 0; | |
1552 | ||
1553 | if (unlikely(protocol_failed(attr) || | |
1554 | attr[IPSET_ATTR_SETNAME] == NULL || | |
1555 | attr[IPSET_ATTR_DATA] == NULL || | |
1556 | !flag_nested(attr[IPSET_ATTR_DATA]))) | |
1557 | return -IPSET_ERR_PROTOCOL; | |
1558 | ||
1785e8f4 | 1559 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
a7b4f989 JK |
1560 | if (set == NULL) |
1561 | return -ENOENT; | |
1562 | ||
8da560ce PM |
1563 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA], |
1564 | set->type->adt_policy)) | |
a7b4f989 JK |
1565 | return -IPSET_ERR_PROTOCOL; |
1566 | ||
1567 | read_lock_bh(&set->lock); | |
3d14b171 | 1568 | ret = set->variant->uadt(set, tb, IPSET_TEST, NULL, 0, 0); |
a7b4f989 JK |
1569 | read_unlock_bh(&set->lock); |
1570 | /* Userspace can't trigger element to be re-added */ | |
1571 | if (ret == -EAGAIN) | |
1572 | ret = 1; | |
1573 | ||
0f1799ba | 1574 | return ret > 0 ? 0 : -IPSET_ERR_EXIST; |
a7b4f989 JK |
1575 | } |
1576 | ||
1577 | /* Get headed data of a set */ | |
1578 | ||
1579 | static int | |
1580 | ip_set_header(struct sock *ctnl, struct sk_buff *skb, | |
1581 | const struct nlmsghdr *nlh, | |
1582 | const struct nlattr * const attr[]) | |
1583 | { | |
1785e8f4 | 1584 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
a7b4f989 JK |
1585 | const struct ip_set *set; |
1586 | struct sk_buff *skb2; | |
1587 | struct nlmsghdr *nlh2; | |
a7b4f989 JK |
1588 | int ret = 0; |
1589 | ||
1590 | if (unlikely(protocol_failed(attr) || | |
1591 | attr[IPSET_ATTR_SETNAME] == NULL)) | |
1592 | return -IPSET_ERR_PROTOCOL; | |
1593 | ||
1785e8f4 | 1594 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
9076aea7 | 1595 | if (set == NULL) |
a7b4f989 | 1596 | return -ENOENT; |
a7b4f989 JK |
1597 | |
1598 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1599 | if (skb2 == NULL) | |
1600 | return -ENOMEM; | |
1601 | ||
15e47304 | 1602 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
a7b4f989 JK |
1603 | IPSET_CMD_HEADER); |
1604 | if (!nlh2) | |
1605 | goto nlmsg_failure; | |
7cf7899d DM |
1606 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || |
1607 | nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name) || | |
1608 | nla_put_string(skb2, IPSET_ATTR_TYPENAME, set->type->name) || | |
1609 | nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) || | |
1610 | nla_put_u8(skb2, IPSET_ATTR_REVISION, set->revision)) | |
1611 | goto nla_put_failure; | |
a7b4f989 JK |
1612 | nlmsg_end(skb2, nlh2); |
1613 | ||
15e47304 | 1614 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
a7b4f989 JK |
1615 | if (ret < 0) |
1616 | return ret; | |
1617 | ||
1618 | return 0; | |
1619 | ||
1620 | nla_put_failure: | |
1621 | nlmsg_cancel(skb2, nlh2); | |
1622 | nlmsg_failure: | |
1623 | kfree_skb(skb2); | |
1624 | return -EMSGSIZE; | |
1625 | } | |
1626 | ||
1627 | /* Get type data */ | |
1628 | ||
1629 | static const struct nla_policy ip_set_type_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1630 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1631 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, | |
1632 | .len = IPSET_MAXNAMELEN - 1 }, | |
1633 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, | |
1634 | }; | |
1635 | ||
1636 | static int | |
1637 | ip_set_type(struct sock *ctnl, struct sk_buff *skb, | |
1638 | const struct nlmsghdr *nlh, | |
1639 | const struct nlattr * const attr[]) | |
1640 | { | |
1641 | struct sk_buff *skb2; | |
1642 | struct nlmsghdr *nlh2; | |
1643 | u8 family, min, max; | |
1644 | const char *typename; | |
1645 | int ret = 0; | |
1646 | ||
1647 | if (unlikely(protocol_failed(attr) || | |
1648 | attr[IPSET_ATTR_TYPENAME] == NULL || | |
1649 | attr[IPSET_ATTR_FAMILY] == NULL)) | |
1650 | return -IPSET_ERR_PROTOCOL; | |
1651 | ||
1652 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); | |
1653 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); | |
1654 | ret = find_set_type_minmax(typename, family, &min, &max); | |
1655 | if (ret) | |
1656 | return ret; | |
1657 | ||
1658 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1659 | if (skb2 == NULL) | |
1660 | return -ENOMEM; | |
1661 | ||
15e47304 | 1662 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
a7b4f989 JK |
1663 | IPSET_CMD_TYPE); |
1664 | if (!nlh2) | |
1665 | goto nlmsg_failure; | |
7cf7899d DM |
1666 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || |
1667 | nla_put_string(skb2, IPSET_ATTR_TYPENAME, typename) || | |
1668 | nla_put_u8(skb2, IPSET_ATTR_FAMILY, family) || | |
1669 | nla_put_u8(skb2, IPSET_ATTR_REVISION, max) || | |
1670 | nla_put_u8(skb2, IPSET_ATTR_REVISION_MIN, min)) | |
1671 | goto nla_put_failure; | |
a7b4f989 JK |
1672 | nlmsg_end(skb2, nlh2); |
1673 | ||
1674 | pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len); | |
15e47304 | 1675 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
a7b4f989 JK |
1676 | if (ret < 0) |
1677 | return ret; | |
1678 | ||
1679 | return 0; | |
1680 | ||
1681 | nla_put_failure: | |
1682 | nlmsg_cancel(skb2, nlh2); | |
1683 | nlmsg_failure: | |
1684 | kfree_skb(skb2); | |
1685 | return -EMSGSIZE; | |
1686 | } | |
1687 | ||
1688 | /* Get protocol version */ | |
1689 | ||
1690 | static const struct nla_policy | |
1691 | ip_set_protocol_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1692 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1693 | }; | |
1694 | ||
1695 | static int | |
1696 | ip_set_protocol(struct sock *ctnl, struct sk_buff *skb, | |
1697 | const struct nlmsghdr *nlh, | |
1698 | const struct nlattr * const attr[]) | |
1699 | { | |
1700 | struct sk_buff *skb2; | |
1701 | struct nlmsghdr *nlh2; | |
1702 | int ret = 0; | |
1703 | ||
1704 | if (unlikely(attr[IPSET_ATTR_PROTOCOL] == NULL)) | |
1705 | return -IPSET_ERR_PROTOCOL; | |
1706 | ||
1707 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1708 | if (skb2 == NULL) | |
1709 | return -ENOMEM; | |
1710 | ||
15e47304 | 1711 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
a7b4f989 JK |
1712 | IPSET_CMD_PROTOCOL); |
1713 | if (!nlh2) | |
1714 | goto nlmsg_failure; | |
7cf7899d DM |
1715 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL)) |
1716 | goto nla_put_failure; | |
a7b4f989 JK |
1717 | nlmsg_end(skb2, nlh2); |
1718 | ||
15e47304 | 1719 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
a7b4f989 JK |
1720 | if (ret < 0) |
1721 | return ret; | |
1722 | ||
1723 | return 0; | |
1724 | ||
1725 | nla_put_failure: | |
1726 | nlmsg_cancel(skb2, nlh2); | |
1727 | nlmsg_failure: | |
1728 | kfree_skb(skb2); | |
1729 | return -EMSGSIZE; | |
1730 | } | |
1731 | ||
1732 | static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = { | |
d31f4d44 TB |
1733 | [IPSET_CMD_NONE] = { |
1734 | .call = ip_set_none, | |
1735 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1736 | }, | |
a7b4f989 JK |
1737 | [IPSET_CMD_CREATE] = { |
1738 | .call = ip_set_create, | |
1739 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1740 | .policy = ip_set_create_policy, | |
1741 | }, | |
1742 | [IPSET_CMD_DESTROY] = { | |
1743 | .call = ip_set_destroy, | |
1744 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1745 | .policy = ip_set_setname_policy, | |
1746 | }, | |
1747 | [IPSET_CMD_FLUSH] = { | |
1748 | .call = ip_set_flush, | |
1749 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1750 | .policy = ip_set_setname_policy, | |
1751 | }, | |
1752 | [IPSET_CMD_RENAME] = { | |
1753 | .call = ip_set_rename, | |
1754 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1755 | .policy = ip_set_setname2_policy, | |
1756 | }, | |
1757 | [IPSET_CMD_SWAP] = { | |
1758 | .call = ip_set_swap, | |
1759 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1760 | .policy = ip_set_setname2_policy, | |
1761 | }, | |
1762 | [IPSET_CMD_LIST] = { | |
1763 | .call = ip_set_dump, | |
1764 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1765 | .policy = ip_set_setname_policy, | |
1766 | }, | |
1767 | [IPSET_CMD_SAVE] = { | |
1768 | .call = ip_set_dump, | |
1769 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1770 | .policy = ip_set_setname_policy, | |
1771 | }, | |
1772 | [IPSET_CMD_ADD] = { | |
1773 | .call = ip_set_uadd, | |
1774 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1775 | .policy = ip_set_adt_policy, | |
1776 | }, | |
1777 | [IPSET_CMD_DEL] = { | |
1778 | .call = ip_set_udel, | |
1779 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1780 | .policy = ip_set_adt_policy, | |
1781 | }, | |
1782 | [IPSET_CMD_TEST] = { | |
1783 | .call = ip_set_utest, | |
1784 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1785 | .policy = ip_set_adt_policy, | |
1786 | }, | |
1787 | [IPSET_CMD_HEADER] = { | |
1788 | .call = ip_set_header, | |
1789 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1790 | .policy = ip_set_setname_policy, | |
1791 | }, | |
1792 | [IPSET_CMD_TYPE] = { | |
1793 | .call = ip_set_type, | |
1794 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1795 | .policy = ip_set_type_policy, | |
1796 | }, | |
1797 | [IPSET_CMD_PROTOCOL] = { | |
1798 | .call = ip_set_protocol, | |
1799 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1800 | .policy = ip_set_protocol_policy, | |
1801 | }, | |
1802 | }; | |
1803 | ||
1804 | static struct nfnetlink_subsystem ip_set_netlink_subsys __read_mostly = { | |
1805 | .name = "ip_set", | |
1806 | .subsys_id = NFNL_SUBSYS_IPSET, | |
1807 | .cb_count = IPSET_MSG_MAX, | |
1808 | .cb = ip_set_netlink_subsys_cb, | |
1809 | }; | |
1810 | ||
1811 | /* Interface to iptables/ip6tables */ | |
1812 | ||
1813 | static int | |
1814 | ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len) | |
1815 | { | |
95c96174 | 1816 | unsigned int *op; |
a7b4f989 JK |
1817 | void *data; |
1818 | int copylen = *len, ret = 0; | |
1785e8f4 VL |
1819 | struct net *net = sock_net(sk); |
1820 | struct ip_set_net *inst = ip_set_pernet(net); | |
a7b4f989 | 1821 | |
1785e8f4 | 1822 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
a7b4f989 JK |
1823 | return -EPERM; |
1824 | if (optval != SO_IP_SET) | |
1825 | return -EBADF; | |
95c96174 | 1826 | if (*len < sizeof(unsigned int)) |
a7b4f989 JK |
1827 | return -EINVAL; |
1828 | ||
1829 | data = vmalloc(*len); | |
1830 | if (!data) | |
1831 | return -ENOMEM; | |
1832 | if (copy_from_user(data, user, *len) != 0) { | |
1833 | ret = -EFAULT; | |
1834 | goto done; | |
1835 | } | |
95c96174 | 1836 | op = (unsigned int *) data; |
a7b4f989 JK |
1837 | |
1838 | if (*op < IP_SET_OP_VERSION) { | |
1839 | /* Check the version at the beginning of operations */ | |
1840 | struct ip_set_req_version *req_version = data; | |
1841 | if (req_version->version != IPSET_PROTOCOL) { | |
1842 | ret = -EPROTO; | |
1843 | goto done; | |
1844 | } | |
1845 | } | |
1846 | ||
1847 | switch (*op) { | |
1848 | case IP_SET_OP_VERSION: { | |
1849 | struct ip_set_req_version *req_version = data; | |
1850 | ||
1851 | if (*len != sizeof(struct ip_set_req_version)) { | |
1852 | ret = -EINVAL; | |
1853 | goto done; | |
1854 | } | |
1855 | ||
1856 | req_version->version = IPSET_PROTOCOL; | |
1857 | ret = copy_to_user(user, req_version, | |
1858 | sizeof(struct ip_set_req_version)); | |
1859 | goto done; | |
1860 | } | |
1861 | case IP_SET_OP_GET_BYNAME: { | |
1862 | struct ip_set_req_get_set *req_get = data; | |
9076aea7 | 1863 | ip_set_id_t id; |
a7b4f989 JK |
1864 | |
1865 | if (*len != sizeof(struct ip_set_req_get_set)) { | |
1866 | ret = -EINVAL; | |
1867 | goto done; | |
1868 | } | |
1869 | req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; | |
c14b78e7 | 1870 | nfnl_lock(NFNL_SUBSYS_IPSET); |
1785e8f4 | 1871 | find_set_and_id(inst, req_get->set.name, &id); |
9076aea7 | 1872 | req_get->set.index = id; |
c14b78e7 | 1873 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
1874 | goto copy; |
1875 | } | |
5e04c0c3 JK |
1876 | case IP_SET_OP_GET_FNAME: { |
1877 | struct ip_set_req_get_set_family *req_get = data; | |
1878 | ip_set_id_t id; | |
1879 | ||
1880 | if (*len != sizeof(struct ip_set_req_get_set_family)) { | |
1881 | ret = -EINVAL; | |
1882 | goto done; | |
1883 | } | |
1884 | req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; | |
1885 | nfnl_lock(NFNL_SUBSYS_IPSET); | |
1785e8f4 | 1886 | find_set_and_id(inst, req_get->set.name, &id); |
5e04c0c3 JK |
1887 | req_get->set.index = id; |
1888 | if (id != IPSET_INVALID_ID) | |
3e90ebd3 | 1889 | req_get->family = ip_set(inst, id)->family; |
5e04c0c3 JK |
1890 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
1891 | goto copy; | |
1892 | } | |
a7b4f989 JK |
1893 | case IP_SET_OP_GET_BYINDEX: { |
1894 | struct ip_set_req_get_set *req_get = data; | |
9076aea7 | 1895 | struct ip_set *set; |
a7b4f989 JK |
1896 | |
1897 | if (*len != sizeof(struct ip_set_req_get_set) || | |
1785e8f4 | 1898 | req_get->set.index >= inst->ip_set_max) { |
a7b4f989 JK |
1899 | ret = -EINVAL; |
1900 | goto done; | |
1901 | } | |
c14b78e7 | 1902 | nfnl_lock(NFNL_SUBSYS_IPSET); |
3e90ebd3 | 1903 | set = ip_set(inst, req_get->set.index); |
9076aea7 | 1904 | strncpy(req_get->set.name, set ? set->name : "", |
a7b4f989 | 1905 | IPSET_MAXNAMELEN); |
c14b78e7 | 1906 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
1907 | goto copy; |
1908 | } | |
1909 | default: | |
1910 | ret = -EBADMSG; | |
1911 | goto done; | |
1912 | } /* end of switch(op) */ | |
1913 | ||
1914 | copy: | |
1915 | ret = copy_to_user(user, data, copylen); | |
1916 | ||
1917 | done: | |
1918 | vfree(data); | |
1919 | if (ret > 0) | |
1920 | ret = 0; | |
1921 | return ret; | |
1922 | } | |
1923 | ||
1924 | static struct nf_sockopt_ops so_set __read_mostly = { | |
1925 | .pf = PF_INET, | |
1926 | .get_optmin = SO_IP_SET, | |
1927 | .get_optmax = SO_IP_SET + 1, | |
1928 | .get = &ip_set_sockfn_get, | |
1929 | .owner = THIS_MODULE, | |
1930 | }; | |
1931 | ||
1785e8f4 VL |
1932 | static int __net_init |
1933 | ip_set_net_init(struct net *net) | |
a7b4f989 | 1934 | { |
1785e8f4 | 1935 | struct ip_set_net *inst = ip_set_pernet(net); |
9076aea7 | 1936 | struct ip_set **list; |
a7b4f989 | 1937 | |
1785e8f4 VL |
1938 | inst->ip_set_max = max_sets ? max_sets : CONFIG_IP_SET_MAX; |
1939 | if (inst->ip_set_max >= IPSET_INVALID_ID) | |
1940 | inst->ip_set_max = IPSET_INVALID_ID - 1; | |
a7b4f989 | 1941 | |
1785e8f4 | 1942 | list = kzalloc(sizeof(struct ip_set *) * inst->ip_set_max, GFP_KERNEL); |
9076aea7 | 1943 | if (!list) |
a7b4f989 | 1944 | return -ENOMEM; |
1785e8f4 VL |
1945 | inst->is_deleted = 0; |
1946 | rcu_assign_pointer(inst->ip_set_list, list); | |
1785e8f4 VL |
1947 | return 0; |
1948 | } | |
1949 | ||
1950 | static void __net_exit | |
1951 | ip_set_net_exit(struct net *net) | |
1952 | { | |
1953 | struct ip_set_net *inst = ip_set_pernet(net); | |
1954 | ||
1955 | struct ip_set *set = NULL; | |
1956 | ip_set_id_t i; | |
1957 | ||
1958 | inst->is_deleted = 1; /* flag for ip_set_nfnl_put */ | |
1959 | ||
1960 | for (i = 0; i < inst->ip_set_max; i++) { | |
3e90ebd3 | 1961 | set = ip_set(inst, i); |
1785e8f4 VL |
1962 | if (set != NULL) |
1963 | ip_set_destroy_set(inst, i); | |
1964 | } | |
1965 | kfree(rcu_dereference_protected(inst->ip_set_list, 1)); | |
1966 | } | |
1967 | ||
1968 | static struct pernet_operations ip_set_net_ops = { | |
1969 | .init = ip_set_net_init, | |
1970 | .exit = ip_set_net_exit, | |
1971 | .id = &ip_set_net_id, | |
1972 | .size = sizeof(struct ip_set_net) | |
1973 | }; | |
1974 | ||
a7b4f989 | 1975 | |
1785e8f4 VL |
1976 | static int __init |
1977 | ip_set_init(void) | |
1978 | { | |
1979 | int ret = nfnetlink_subsys_register(&ip_set_netlink_subsys); | |
a7b4f989 JK |
1980 | if (ret != 0) { |
1981 | pr_err("ip_set: cannot register with nfnetlink.\n"); | |
a7b4f989 JK |
1982 | return ret; |
1983 | } | |
1984 | ret = nf_register_sockopt(&so_set); | |
1985 | if (ret != 0) { | |
1986 | pr_err("SO_SET registry failed: %d\n", ret); | |
1987 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); | |
a7b4f989 JK |
1988 | return ret; |
1989 | } | |
1785e8f4 VL |
1990 | ret = register_pernet_subsys(&ip_set_net_ops); |
1991 | if (ret) { | |
1992 | pr_err("ip_set: cannot register pernet_subsys.\n"); | |
1993 | nf_unregister_sockopt(&so_set); | |
1994 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); | |
1995 | return ret; | |
1996 | } | |
6843bc3c | 1997 | pr_info("ip_set: protocol %u\n", IPSET_PROTOCOL); |
a7b4f989 JK |
1998 | return 0; |
1999 | } | |
2000 | ||
2001 | static void __exit | |
2002 | ip_set_fini(void) | |
2003 | { | |
1785e8f4 | 2004 | unregister_pernet_subsys(&ip_set_net_ops); |
a7b4f989 JK |
2005 | nf_unregister_sockopt(&so_set); |
2006 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); | |
a7b4f989 JK |
2007 | pr_debug("these are the famous last words\n"); |
2008 | } | |
2009 | ||
2010 | module_init(ip_set_init); | |
2011 | module_exit(ip_set_fini); |