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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a7b4f989 JK |
2 | /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu> |
3 | * Patrick Schaaf <bof@bof.de> | |
fe03d474 | 4 | * Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org> |
a7b4f989 JK |
5 | */ |
6 | ||
7 | /* Kernel module for IP set management */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/moduleparam.h> | |
12 | #include <linux/ip.h> | |
13 | #include <linux/skbuff.h> | |
14 | #include <linux/spinlock.h> | |
a7b4f989 | 15 | #include <linux/rculist.h> |
a7b4f989 | 16 | #include <net/netlink.h> |
1785e8f4 VL |
17 | #include <net/net_namespace.h> |
18 | #include <net/netns/generic.h> | |
a7b4f989 JK |
19 | |
20 | #include <linux/netfilter.h> | |
b66554cf | 21 | #include <linux/netfilter/x_tables.h> |
a7b4f989 JK |
22 | #include <linux/netfilter/nfnetlink.h> |
23 | #include <linux/netfilter/ipset/ip_set.h> | |
24 | ||
25 | static LIST_HEAD(ip_set_type_list); /* all registered set types */ | |
26 | static DEFINE_MUTEX(ip_set_type_mutex); /* protects ip_set_type_list */ | |
2f9f28b2 | 27 | static DEFINE_RWLOCK(ip_set_ref_lock); /* protects the set refs */ |
a7b4f989 | 28 | |
1785e8f4 VL |
29 | struct ip_set_net { |
30 | struct ip_set * __rcu *ip_set_list; /* all individual sets */ | |
31 | ip_set_id_t ip_set_max; /* max number of sets */ | |
9c1ba5c8 JK |
32 | bool is_deleted; /* deleted by ip_set_net_exit */ |
33 | bool is_destroyed; /* all sets are destroyed */ | |
1785e8f4 | 34 | }; |
ca0f6a5c | 35 | |
c7d03a00 | 36 | static unsigned int ip_set_net_id __read_mostly; |
1785e8f4 | 37 | |
8dea982a | 38 | static struct ip_set_net *ip_set_pernet(struct net *net) |
1785e8f4 VL |
39 | { |
40 | return net_generic(net, ip_set_net_id); | |
41 | } | |
a7b4f989 | 42 | |
9076aea7 | 43 | #define IP_SET_INC 64 |
22496f09 | 44 | #define STRNCMP(a, b) (strncmp(a, b, IPSET_MAXNAMELEN) == 0) |
a7b4f989 JK |
45 | |
46 | static unsigned int max_sets; | |
47 | ||
48 | module_param(max_sets, int, 0600); | |
49 | MODULE_PARM_DESC(max_sets, "maximal number of sets"); | |
50 | MODULE_LICENSE("GPL"); | |
fe03d474 | 51 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>"); |
a7b4f989 JK |
52 | MODULE_DESCRIPTION("core IP set support"); |
53 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_IPSET); | |
54 | ||
8a02bdd5 | 55 | /* When the nfnl mutex or ip_set_ref_lock is held: */ |
3e90ebd3 | 56 | #define ip_set_dereference(p) \ |
8a02bdd5 JK |
57 | rcu_dereference_protected(p, \ |
58 | lockdep_nfnl_is_held(NFNL_SUBSYS_IPSET) || \ | |
59 | lockdep_is_held(&ip_set_ref_lock)) | |
3e90ebd3 PM |
60 | #define ip_set(inst, id) \ |
61 | ip_set_dereference((inst)->ip_set_list)[id] | |
8a02bdd5 JK |
62 | #define ip_set_ref_netlink(inst,id) \ |
63 | rcu_dereference_raw((inst)->ip_set_list)[id] | |
9076aea7 | 64 | |
ca0f6a5c | 65 | /* The set types are implemented in modules and registered set types |
a7b4f989 JK |
66 | * can be found in ip_set_type_list. Adding/deleting types is |
67 | * serialized by ip_set_type_mutex. | |
68 | */ | |
69 | ||
8dea982a | 70 | static void |
a7b4f989 JK |
71 | ip_set_type_lock(void) |
72 | { | |
73 | mutex_lock(&ip_set_type_mutex); | |
74 | } | |
75 | ||
8dea982a | 76 | static void |
a7b4f989 JK |
77 | ip_set_type_unlock(void) |
78 | { | |
79 | mutex_unlock(&ip_set_type_mutex); | |
80 | } | |
81 | ||
82 | /* Register and deregister settype */ | |
83 | ||
84 | static struct ip_set_type * | |
85 | find_set_type(const char *name, u8 family, u8 revision) | |
86 | { | |
87 | struct ip_set_type *type; | |
88 | ||
89 | list_for_each_entry_rcu(type, &ip_set_type_list, list) | |
22496f09 | 90 | if (STRNCMP(type->name, name) && |
3ace95c0 JK |
91 | (type->family == family || |
92 | type->family == NFPROTO_UNSPEC) && | |
f1e00b39 JK |
93 | revision >= type->revision_min && |
94 | revision <= type->revision_max) | |
a7b4f989 JK |
95 | return type; |
96 | return NULL; | |
97 | } | |
98 | ||
99 | /* Unlock, try to load a set type module and lock again */ | |
088067f4 JK |
100 | static bool |
101 | load_settype(const char *name) | |
a7b4f989 | 102 | { |
c14b78e7 | 103 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
104 | pr_debug("try to load ip_set_%s\n", name); |
105 | if (request_module("ip_set_%s", name) < 0) { | |
b167a37c | 106 | pr_warn("Can't find ip_set type %s\n", name); |
c14b78e7 | 107 | nfnl_lock(NFNL_SUBSYS_IPSET); |
088067f4 | 108 | return false; |
a7b4f989 | 109 | } |
c14b78e7 | 110 | nfnl_lock(NFNL_SUBSYS_IPSET); |
088067f4 | 111 | return true; |
a7b4f989 JK |
112 | } |
113 | ||
114 | /* Find a set type and reference it */ | |
088067f4 JK |
115 | #define find_set_type_get(name, family, revision, found) \ |
116 | __find_set_type_get(name, family, revision, found, false) | |
117 | ||
a7b4f989 | 118 | static int |
088067f4 JK |
119 | __find_set_type_get(const char *name, u8 family, u8 revision, |
120 | struct ip_set_type **found, bool retry) | |
a7b4f989 | 121 | { |
5c1aba46 JK |
122 | struct ip_set_type *type; |
123 | int err; | |
124 | ||
088067f4 JK |
125 | if (retry && !load_settype(name)) |
126 | return -IPSET_ERR_FIND_TYPE; | |
127 | ||
a7b4f989 JK |
128 | rcu_read_lock(); |
129 | *found = find_set_type(name, family, revision); | |
130 | if (*found) { | |
5c1aba46 JK |
131 | err = !try_module_get((*found)->me) ? -EFAULT : 0; |
132 | goto unlock; | |
a7b4f989 | 133 | } |
088067f4 | 134 | /* Make sure the type is already loaded |
ca0f6a5c JK |
135 | * but we don't support the revision |
136 | */ | |
5c1aba46 | 137 | list_for_each_entry_rcu(type, &ip_set_type_list, list) |
22496f09 | 138 | if (STRNCMP(type->name, name)) { |
5c1aba46 JK |
139 | err = -IPSET_ERR_FIND_TYPE; |
140 | goto unlock; | |
141 | } | |
a7b4f989 JK |
142 | rcu_read_unlock(); |
143 | ||
088067f4 JK |
144 | return retry ? -IPSET_ERR_FIND_TYPE : |
145 | __find_set_type_get(name, family, revision, found, true); | |
5c1aba46 JK |
146 | |
147 | unlock: | |
148 | rcu_read_unlock(); | |
149 | return err; | |
a7b4f989 JK |
150 | } |
151 | ||
152 | /* Find a given set type by name and family. | |
153 | * If we succeeded, the supported minimal and maximum revisions are | |
154 | * filled out. | |
155 | */ | |
088067f4 JK |
156 | #define find_set_type_minmax(name, family, min, max) \ |
157 | __find_set_type_minmax(name, family, min, max, false) | |
158 | ||
a7b4f989 | 159 | static int |
088067f4 JK |
160 | __find_set_type_minmax(const char *name, u8 family, u8 *min, u8 *max, |
161 | bool retry) | |
a7b4f989 JK |
162 | { |
163 | struct ip_set_type *type; | |
164 | bool found = false; | |
165 | ||
088067f4 JK |
166 | if (retry && !load_settype(name)) |
167 | return -IPSET_ERR_FIND_TYPE; | |
168 | ||
5c1aba46 | 169 | *min = 255; *max = 0; |
a7b4f989 JK |
170 | rcu_read_lock(); |
171 | list_for_each_entry_rcu(type, &ip_set_type_list, list) | |
22496f09 | 172 | if (STRNCMP(type->name, name) && |
3ace95c0 JK |
173 | (type->family == family || |
174 | type->family == NFPROTO_UNSPEC)) { | |
a7b4f989 | 175 | found = true; |
f1e00b39 JK |
176 | if (type->revision_min < *min) |
177 | *min = type->revision_min; | |
178 | if (type->revision_max > *max) | |
179 | *max = type->revision_max; | |
a7b4f989 JK |
180 | } |
181 | rcu_read_unlock(); | |
182 | if (found) | |
183 | return 0; | |
184 | ||
088067f4 JK |
185 | return retry ? -IPSET_ERR_FIND_TYPE : |
186 | __find_set_type_minmax(name, family, min, max, true); | |
a7b4f989 JK |
187 | } |
188 | ||
c15f1c83 JE |
189 | #define family_name(f) ((f) == NFPROTO_IPV4 ? "inet" : \ |
190 | (f) == NFPROTO_IPV6 ? "inet6" : "any") | |
a7b4f989 JK |
191 | |
192 | /* Register a set type structure. The type is identified by | |
193 | * the unique triple of name, family and revision. | |
194 | */ | |
195 | int | |
196 | ip_set_type_register(struct ip_set_type *type) | |
197 | { | |
198 | int ret = 0; | |
199 | ||
200 | if (type->protocol != IPSET_PROTOCOL) { | |
b167a37c JP |
201 | pr_warn("ip_set type %s, family %s, revision %u:%u uses wrong protocol version %u (want %u)\n", |
202 | type->name, family_name(type->family), | |
203 | type->revision_min, type->revision_max, | |
204 | type->protocol, IPSET_PROTOCOL); | |
a7b4f989 JK |
205 | return -EINVAL; |
206 | } | |
207 | ||
208 | ip_set_type_lock(); | |
f1e00b39 | 209 | if (find_set_type(type->name, type->family, type->revision_min)) { |
a7b4f989 | 210 | /* Duplicate! */ |
b167a37c JP |
211 | pr_warn("ip_set type %s, family %s with revision min %u already registered!\n", |
212 | type->name, family_name(type->family), | |
213 | type->revision_min); | |
b57b2d1f JK |
214 | ip_set_type_unlock(); |
215 | return -EINVAL; | |
a7b4f989 JK |
216 | } |
217 | list_add_rcu(&type->list, &ip_set_type_list); | |
f1e00b39 JK |
218 | pr_debug("type %s, family %s, revision %u:%u registered.\n", |
219 | type->name, family_name(type->family), | |
220 | type->revision_min, type->revision_max); | |
a7b4f989 | 221 | ip_set_type_unlock(); |
b57b2d1f | 222 | |
a7b4f989 JK |
223 | return ret; |
224 | } | |
225 | EXPORT_SYMBOL_GPL(ip_set_type_register); | |
226 | ||
227 | /* Unregister a set type. There's a small race with ip_set_create */ | |
228 | void | |
229 | ip_set_type_unregister(struct ip_set_type *type) | |
230 | { | |
231 | ip_set_type_lock(); | |
f1e00b39 | 232 | if (!find_set_type(type->name, type->family, type->revision_min)) { |
b167a37c JP |
233 | pr_warn("ip_set type %s, family %s with revision min %u not registered\n", |
234 | type->name, family_name(type->family), | |
235 | type->revision_min); | |
b57b2d1f JK |
236 | ip_set_type_unlock(); |
237 | return; | |
a7b4f989 JK |
238 | } |
239 | list_del_rcu(&type->list); | |
f1e00b39 JK |
240 | pr_debug("type %s, family %s with revision min %u unregistered.\n", |
241 | type->name, family_name(type->family), type->revision_min); | |
a7b4f989 JK |
242 | ip_set_type_unlock(); |
243 | ||
244 | synchronize_rcu(); | |
245 | } | |
246 | EXPORT_SYMBOL_GPL(ip_set_type_unregister); | |
247 | ||
248 | /* Utility functions */ | |
249 | void * | |
250 | ip_set_alloc(size_t size) | |
251 | { | |
252 | void *members = NULL; | |
253 | ||
254 | if (size < KMALLOC_MAX_SIZE) | |
255 | members = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); | |
256 | ||
257 | if (members) { | |
258 | pr_debug("%p: allocated with kmalloc\n", members); | |
259 | return members; | |
260 | } | |
261 | ||
262 | members = vzalloc(size); | |
263 | if (!members) | |
264 | return NULL; | |
265 | pr_debug("%p: allocated with vmalloc\n", members); | |
266 | ||
267 | return members; | |
268 | } | |
269 | EXPORT_SYMBOL_GPL(ip_set_alloc); | |
270 | ||
271 | void | |
272 | ip_set_free(void *members) | |
273 | { | |
274 | pr_debug("%p: free with %s\n", members, | |
275 | is_vmalloc_addr(members) ? "vfree" : "kfree"); | |
4cb28970 | 276 | kvfree(members); |
a7b4f989 JK |
277 | } |
278 | EXPORT_SYMBOL_GPL(ip_set_free); | |
279 | ||
8dea982a | 280 | static bool |
a7b4f989 JK |
281 | flag_nested(const struct nlattr *nla) |
282 | { | |
283 | return nla->nla_type & NLA_F_NESTED; | |
284 | } | |
285 | ||
286 | static const struct nla_policy ipaddr_policy[IPSET_ATTR_IPADDR_MAX + 1] = { | |
287 | [IPSET_ATTR_IPADDR_IPV4] = { .type = NLA_U32 }, | |
288 | [IPSET_ATTR_IPADDR_IPV6] = { .type = NLA_BINARY, | |
289 | .len = sizeof(struct in6_addr) }, | |
290 | }; | |
291 | ||
292 | int | |
293 | ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr) | |
294 | { | |
ca0f6a5c | 295 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX + 1]; |
a7b4f989 JK |
296 | |
297 | if (unlikely(!flag_nested(nla))) | |
298 | return -IPSET_ERR_PROTOCOL; | |
12899756 JK |
299 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, |
300 | ipaddr_policy, NULL)) | |
a7b4f989 JK |
301 | return -IPSET_ERR_PROTOCOL; |
302 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV4))) | |
303 | return -IPSET_ERR_PROTOCOL; | |
304 | ||
305 | *ipaddr = nla_get_be32(tb[IPSET_ATTR_IPADDR_IPV4]); | |
306 | return 0; | |
307 | } | |
308 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr4); | |
309 | ||
310 | int | |
311 | ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr) | |
312 | { | |
ca0f6a5c | 313 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX + 1]; |
a7b4f989 JK |
314 | |
315 | if (unlikely(!flag_nested(nla))) | |
316 | return -IPSET_ERR_PROTOCOL; | |
317 | ||
12899756 JK |
318 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, |
319 | ipaddr_policy, NULL)) | |
a7b4f989 JK |
320 | return -IPSET_ERR_PROTOCOL; |
321 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV6))) | |
322 | return -IPSET_ERR_PROTOCOL; | |
323 | ||
324 | memcpy(ipaddr, nla_data(tb[IPSET_ATTR_IPADDR_IPV6]), | |
ca0f6a5c | 325 | sizeof(struct in6_addr)); |
a7b4f989 JK |
326 | return 0; |
327 | } | |
328 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr6); | |
329 | ||
2398a976 JS |
330 | static u32 |
331 | ip_set_timeout_get(const unsigned long *timeout) | |
332 | { | |
333 | u32 t; | |
334 | ||
335 | if (*timeout == IPSET_ELEM_PERMANENT) | |
336 | return 0; | |
337 | ||
338 | t = jiffies_to_msecs(*timeout - jiffies) / MSEC_PER_SEC; | |
339 | /* Zero value in userspace means no timeout */ | |
340 | return t == 0 ? 1 : t; | |
341 | } | |
342 | ||
94177f6e JS |
343 | static char * |
344 | ip_set_comment_uget(struct nlattr *tb) | |
345 | { | |
346 | return nla_data(tb); | |
347 | } | |
348 | ||
349 | /* Called from uadd only, protected by the set spinlock. | |
350 | * The kadt functions don't use the comment extensions in any way. | |
351 | */ | |
352 | void | |
353 | ip_set_init_comment(struct ip_set *set, struct ip_set_comment *comment, | |
354 | const struct ip_set_ext *ext) | |
355 | { | |
356 | struct ip_set_comment_rcu *c = rcu_dereference_protected(comment->c, 1); | |
357 | size_t len = ext->comment ? strlen(ext->comment) : 0; | |
358 | ||
359 | if (unlikely(c)) { | |
360 | set->ext_size -= sizeof(*c) + strlen(c->str) + 1; | |
361 | kfree_rcu(c, rcu); | |
362 | rcu_assign_pointer(comment->c, NULL); | |
363 | } | |
364 | if (!len) | |
365 | return; | |
366 | if (unlikely(len > IPSET_MAX_COMMENT_SIZE)) | |
367 | len = IPSET_MAX_COMMENT_SIZE; | |
368 | c = kmalloc(sizeof(*c) + len + 1, GFP_ATOMIC); | |
369 | if (unlikely(!c)) | |
370 | return; | |
371 | strlcpy(c->str, ext->comment, len + 1); | |
372 | set->ext_size += sizeof(*c) + strlen(c->str) + 1; | |
373 | rcu_assign_pointer(comment->c, c); | |
374 | } | |
375 | EXPORT_SYMBOL_GPL(ip_set_init_comment); | |
376 | ||
377 | /* Used only when dumping a set, protected by rcu_read_lock() */ | |
378 | static int | |
379 | ip_set_put_comment(struct sk_buff *skb, const struct ip_set_comment *comment) | |
380 | { | |
381 | struct ip_set_comment_rcu *c = rcu_dereference(comment->c); | |
382 | ||
383 | if (!c) | |
384 | return 0; | |
385 | return nla_put_string(skb, IPSET_ATTR_COMMENT, c->str); | |
386 | } | |
387 | ||
388 | /* Called from uadd/udel, flush or the garbage collectors protected | |
389 | * by the set spinlock. | |
390 | * Called when the set is destroyed and when there can't be any user | |
391 | * of the set data anymore. | |
392 | */ | |
393 | static void | |
394 | ip_set_comment_free(struct ip_set *set, void *ptr) | |
395 | { | |
396 | struct ip_set_comment *comment = ptr; | |
397 | struct ip_set_comment_rcu *c; | |
398 | ||
399 | c = rcu_dereference_protected(comment->c, 1); | |
400 | if (unlikely(!c)) | |
401 | return; | |
402 | set->ext_size -= sizeof(*c) + strlen(c->str) + 1; | |
403 | kfree_rcu(c, rcu); | |
404 | rcu_assign_pointer(comment->c, NULL); | |
405 | } | |
406 | ||
9e41f26a | 407 | typedef void (*destroyer)(struct ip_set *, void *); |
03c8b234 JK |
408 | /* ipset data extension types, in size order */ |
409 | ||
410 | const struct ip_set_ext_type ip_set_extensions[] = { | |
411 | [IPSET_EXT_ID_COUNTER] = { | |
412 | .type = IPSET_EXT_COUNTER, | |
413 | .flag = IPSET_FLAG_WITH_COUNTERS, | |
414 | .len = sizeof(struct ip_set_counter), | |
415 | .align = __alignof__(struct ip_set_counter), | |
416 | }, | |
417 | [IPSET_EXT_ID_TIMEOUT] = { | |
418 | .type = IPSET_EXT_TIMEOUT, | |
419 | .len = sizeof(unsigned long), | |
420 | .align = __alignof__(unsigned long), | |
421 | }, | |
0e9871e3 AD |
422 | [IPSET_EXT_ID_SKBINFO] = { |
423 | .type = IPSET_EXT_SKBINFO, | |
424 | .flag = IPSET_FLAG_WITH_SKBINFO, | |
425 | .len = sizeof(struct ip_set_skbinfo), | |
426 | .align = __alignof__(struct ip_set_skbinfo), | |
427 | }, | |
68b63f08 OS |
428 | [IPSET_EXT_ID_COMMENT] = { |
429 | .type = IPSET_EXT_COMMENT | IPSET_EXT_DESTROY, | |
430 | .flag = IPSET_FLAG_WITH_COMMENT, | |
431 | .len = sizeof(struct ip_set_comment), | |
432 | .align = __alignof__(struct ip_set_comment), | |
94177f6e | 433 | .destroy = ip_set_comment_free, |
68b63f08 | 434 | }, |
03c8b234 JK |
435 | }; |
436 | EXPORT_SYMBOL_GPL(ip_set_extensions); | |
437 | ||
8dea982a | 438 | static bool |
03c8b234 JK |
439 | add_extension(enum ip_set_ext_id id, u32 flags, struct nlattr *tb[]) |
440 | { | |
441 | return ip_set_extensions[id].flag ? | |
442 | (flags & ip_set_extensions[id].flag) : | |
443 | !!tb[IPSET_ATTR_TIMEOUT]; | |
444 | } | |
445 | ||
446 | size_t | |
95ad1f4a JK |
447 | ip_set_elem_len(struct ip_set *set, struct nlattr *tb[], size_t len, |
448 | size_t align) | |
03c8b234 JK |
449 | { |
450 | enum ip_set_ext_id id; | |
03c8b234 JK |
451 | u32 cadt_flags = 0; |
452 | ||
453 | if (tb[IPSET_ATTR_CADT_FLAGS]) | |
454 | cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); | |
07cf8f5a JH |
455 | if (cadt_flags & IPSET_FLAG_WITH_FORCEADD) |
456 | set->flags |= IPSET_CREATE_FLAG_FORCEADD; | |
95ad1f4a JK |
457 | if (!align) |
458 | align = 1; | |
03c8b234 JK |
459 | for (id = 0; id < IPSET_EXT_ID_MAX; id++) { |
460 | if (!add_extension(id, cadt_flags, tb)) | |
461 | continue; | |
95ad1f4a JK |
462 | len = ALIGN(len, ip_set_extensions[id].align); |
463 | set->offset[id] = len; | |
03c8b234 | 464 | set->extensions |= ip_set_extensions[id].type; |
95ad1f4a | 465 | len += ip_set_extensions[id].len; |
03c8b234 | 466 | } |
95ad1f4a | 467 | return ALIGN(len, align); |
03c8b234 JK |
468 | } |
469 | EXPORT_SYMBOL_GPL(ip_set_elem_len); | |
470 | ||
075e64c0 JK |
471 | int |
472 | ip_set_get_extensions(struct ip_set *set, struct nlattr *tb[], | |
473 | struct ip_set_ext *ext) | |
474 | { | |
0e9871e3 | 475 | u64 fullmark; |
7dd37bc8 SP |
476 | |
477 | if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || | |
478 | !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || | |
479 | !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) || | |
480 | !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) || | |
481 | !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) || | |
482 | !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE))) | |
483 | return -IPSET_ERR_PROTOCOL; | |
484 | ||
075e64c0 | 485 | if (tb[IPSET_ATTR_TIMEOUT]) { |
edda0791 | 486 | if (!SET_WITH_TIMEOUT(set)) |
075e64c0 JK |
487 | return -IPSET_ERR_TIMEOUT; |
488 | ext->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); | |
489 | } | |
34d666d4 | 490 | if (tb[IPSET_ATTR_BYTES] || tb[IPSET_ATTR_PACKETS]) { |
edda0791 | 491 | if (!SET_WITH_COUNTER(set)) |
34d666d4 JK |
492 | return -IPSET_ERR_COUNTER; |
493 | if (tb[IPSET_ATTR_BYTES]) | |
494 | ext->bytes = be64_to_cpu(nla_get_be64( | |
495 | tb[IPSET_ATTR_BYTES])); | |
496 | if (tb[IPSET_ATTR_PACKETS]) | |
497 | ext->packets = be64_to_cpu(nla_get_be64( | |
498 | tb[IPSET_ATTR_PACKETS])); | |
499 | } | |
68b63f08 | 500 | if (tb[IPSET_ATTR_COMMENT]) { |
edda0791 | 501 | if (!SET_WITH_COMMENT(set)) |
68b63f08 OS |
502 | return -IPSET_ERR_COMMENT; |
503 | ext->comment = ip_set_comment_uget(tb[IPSET_ATTR_COMMENT]); | |
504 | } | |
0e9871e3 | 505 | if (tb[IPSET_ATTR_SKBMARK]) { |
edda0791 | 506 | if (!SET_WITH_SKBINFO(set)) |
0e9871e3 AD |
507 | return -IPSET_ERR_SKBINFO; |
508 | fullmark = be64_to_cpu(nla_get_be64(tb[IPSET_ATTR_SKBMARK])); | |
bec810d9 JK |
509 | ext->skbinfo.skbmark = fullmark >> 32; |
510 | ext->skbinfo.skbmarkmask = fullmark & 0xffffffff; | |
0e9871e3 AD |
511 | } |
512 | if (tb[IPSET_ATTR_SKBPRIO]) { | |
edda0791 | 513 | if (!SET_WITH_SKBINFO(set)) |
0e9871e3 | 514 | return -IPSET_ERR_SKBINFO; |
bec810d9 JK |
515 | ext->skbinfo.skbprio = |
516 | be32_to_cpu(nla_get_be32(tb[IPSET_ATTR_SKBPRIO])); | |
0e9871e3 AD |
517 | } |
518 | if (tb[IPSET_ATTR_SKBQUEUE]) { | |
edda0791 | 519 | if (!SET_WITH_SKBINFO(set)) |
0e9871e3 | 520 | return -IPSET_ERR_SKBINFO; |
bec810d9 JK |
521 | ext->skbinfo.skbqueue = |
522 | be16_to_cpu(nla_get_be16(tb[IPSET_ATTR_SKBQUEUE])); | |
0e9871e3 | 523 | } |
075e64c0 JK |
524 | return 0; |
525 | } | |
526 | EXPORT_SYMBOL_GPL(ip_set_get_extensions); | |
527 | ||
2398a976 JS |
528 | static u64 |
529 | ip_set_get_bytes(const struct ip_set_counter *counter) | |
530 | { | |
531 | return (u64)atomic64_read(&(counter)->bytes); | |
532 | } | |
533 | ||
534 | static u64 | |
535 | ip_set_get_packets(const struct ip_set_counter *counter) | |
536 | { | |
537 | return (u64)atomic64_read(&(counter)->packets); | |
538 | } | |
539 | ||
540 | static bool | |
541 | ip_set_put_counter(struct sk_buff *skb, const struct ip_set_counter *counter) | |
542 | { | |
543 | return nla_put_net64(skb, IPSET_ATTR_BYTES, | |
544 | cpu_to_be64(ip_set_get_bytes(counter)), | |
545 | IPSET_ATTR_PAD) || | |
546 | nla_put_net64(skb, IPSET_ATTR_PACKETS, | |
547 | cpu_to_be64(ip_set_get_packets(counter)), | |
548 | IPSET_ATTR_PAD); | |
549 | } | |
550 | ||
551 | static bool | |
552 | ip_set_put_skbinfo(struct sk_buff *skb, const struct ip_set_skbinfo *skbinfo) | |
553 | { | |
554 | /* Send nonzero parameters only */ | |
555 | return ((skbinfo->skbmark || skbinfo->skbmarkmask) && | |
556 | nla_put_net64(skb, IPSET_ATTR_SKBMARK, | |
557 | cpu_to_be64((u64)skbinfo->skbmark << 32 | | |
558 | skbinfo->skbmarkmask), | |
559 | IPSET_ATTR_PAD)) || | |
560 | (skbinfo->skbprio && | |
561 | nla_put_net32(skb, IPSET_ATTR_SKBPRIO, | |
562 | cpu_to_be32(skbinfo->skbprio))) || | |
563 | (skbinfo->skbqueue && | |
564 | nla_put_net16(skb, IPSET_ATTR_SKBQUEUE, | |
565 | cpu_to_be16(skbinfo->skbqueue))); | |
566 | } | |
567 | ||
a3b1c1eb DV |
568 | int |
569 | ip_set_put_extensions(struct sk_buff *skb, const struct ip_set *set, | |
570 | const void *e, bool active) | |
571 | { | |
572 | if (SET_WITH_TIMEOUT(set)) { | |
573 | unsigned long *timeout = ext_timeout(e, set); | |
574 | ||
575 | if (nla_put_net32(skb, IPSET_ATTR_TIMEOUT, | |
576 | htonl(active ? ip_set_timeout_get(timeout) | |
577 | : *timeout))) | |
578 | return -EMSGSIZE; | |
579 | } | |
580 | if (SET_WITH_COUNTER(set) && | |
581 | ip_set_put_counter(skb, ext_counter(e, set))) | |
582 | return -EMSGSIZE; | |
583 | if (SET_WITH_COMMENT(set) && | |
584 | ip_set_put_comment(skb, ext_comment(e, set))) | |
585 | return -EMSGSIZE; | |
586 | if (SET_WITH_SKBINFO(set) && | |
587 | ip_set_put_skbinfo(skb, ext_skbinfo(e, set))) | |
588 | return -EMSGSIZE; | |
589 | return 0; | |
590 | } | |
591 | EXPORT_SYMBOL_GPL(ip_set_put_extensions); | |
592 | ||
2398a976 JS |
593 | static bool |
594 | ip_set_match_counter(u64 counter, u64 match, u8 op) | |
595 | { | |
596 | switch (op) { | |
597 | case IPSET_COUNTER_NONE: | |
598 | return true; | |
599 | case IPSET_COUNTER_EQ: | |
600 | return counter == match; | |
601 | case IPSET_COUNTER_NE: | |
602 | return counter != match; | |
603 | case IPSET_COUNTER_LT: | |
604 | return counter < match; | |
605 | case IPSET_COUNTER_GT: | |
606 | return counter > match; | |
607 | } | |
608 | return false; | |
609 | } | |
610 | ||
611 | static void | |
612 | ip_set_add_bytes(u64 bytes, struct ip_set_counter *counter) | |
613 | { | |
614 | atomic64_add((long long)bytes, &(counter)->bytes); | |
615 | } | |
616 | ||
617 | static void | |
618 | ip_set_add_packets(u64 packets, struct ip_set_counter *counter) | |
619 | { | |
620 | atomic64_add((long long)packets, &(counter)->packets); | |
621 | } | |
622 | ||
623 | static void | |
624 | ip_set_update_counter(struct ip_set_counter *counter, | |
625 | const struct ip_set_ext *ext, u32 flags) | |
626 | { | |
627 | if (ext->packets != ULLONG_MAX && | |
628 | !(flags & IPSET_FLAG_SKIP_COUNTER_UPDATE)) { | |
629 | ip_set_add_bytes(ext->bytes, counter); | |
630 | ip_set_add_packets(ext->packets, counter); | |
631 | } | |
632 | } | |
633 | ||
634 | static void | |
635 | ip_set_get_skbinfo(struct ip_set_skbinfo *skbinfo, | |
636 | const struct ip_set_ext *ext, | |
637 | struct ip_set_ext *mext, u32 flags) | |
638 | { | |
639 | mext->skbinfo = *skbinfo; | |
640 | } | |
641 | ||
4750005a JK |
642 | bool |
643 | ip_set_match_extensions(struct ip_set *set, const struct ip_set_ext *ext, | |
644 | struct ip_set_ext *mext, u32 flags, void *data) | |
645 | { | |
646 | if (SET_WITH_TIMEOUT(set) && | |
647 | ip_set_timeout_expired(ext_timeout(data, set))) | |
648 | return false; | |
649 | if (SET_WITH_COUNTER(set)) { | |
650 | struct ip_set_counter *counter = ext_counter(data, set); | |
651 | ||
652 | if (flags & IPSET_FLAG_MATCH_COUNTERS && | |
653 | !(ip_set_match_counter(ip_set_get_packets(counter), | |
654 | mext->packets, mext->packets_op) && | |
655 | ip_set_match_counter(ip_set_get_bytes(counter), | |
656 | mext->bytes, mext->bytes_op))) | |
657 | return false; | |
658 | ip_set_update_counter(counter, ext, flags); | |
659 | } | |
660 | if (SET_WITH_SKBINFO(set)) | |
661 | ip_set_get_skbinfo(ext_skbinfo(data, set), | |
662 | ext, mext, flags); | |
663 | return true; | |
664 | } | |
665 | EXPORT_SYMBOL_GPL(ip_set_match_extensions); | |
666 | ||
ca0f6a5c | 667 | /* Creating/destroying/renaming/swapping affect the existence and |
a7b4f989 JK |
668 | * the properties of a set. All of these can be executed from userspace |
669 | * only and serialized by the nfnl mutex indirectly from nfnetlink. | |
670 | * | |
671 | * Sets are identified by their index in ip_set_list and the index | |
672 | * is used by the external references (set/SET netfilter modules). | |
673 | * | |
674 | * The set behind an index may change by swapping only, from userspace. | |
675 | */ | |
676 | ||
8dea982a | 677 | static void |
9076aea7 | 678 | __ip_set_get(struct ip_set *set) |
a7b4f989 | 679 | { |
2f9f28b2 | 680 | write_lock_bh(&ip_set_ref_lock); |
9076aea7 | 681 | set->ref++; |
2f9f28b2 | 682 | write_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
683 | } |
684 | ||
8dea982a | 685 | static void |
9076aea7 | 686 | __ip_set_put(struct ip_set *set) |
a7b4f989 | 687 | { |
2f9f28b2 | 688 | write_lock_bh(&ip_set_ref_lock); |
9076aea7 JK |
689 | BUG_ON(set->ref == 0); |
690 | set->ref--; | |
2f9f28b2 | 691 | write_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
692 | } |
693 | ||
596cf3fe VP |
694 | /* set->ref can be swapped out by ip_set_swap, netlink events (like dump) need |
695 | * a separate reference counter | |
696 | */ | |
8dea982a | 697 | static void |
596cf3fe VP |
698 | __ip_set_put_netlink(struct ip_set *set) |
699 | { | |
700 | write_lock_bh(&ip_set_ref_lock); | |
701 | BUG_ON(set->ref_netlink == 0); | |
702 | set->ref_netlink--; | |
703 | write_unlock_bh(&ip_set_ref_lock); | |
704 | } | |
705 | ||
ca0f6a5c | 706 | /* Add, del and test set entries from kernel. |
a7b4f989 JK |
707 | * |
708 | * The set behind the index must exist and must be referenced | |
709 | * so it can't be destroyed (or changed) under our foot. | |
710 | */ | |
711 | ||
8dea982a | 712 | static struct ip_set * |
1785e8f4 | 713 | ip_set_rcu_get(struct net *net, ip_set_id_t index) |
9076aea7 JK |
714 | { |
715 | struct ip_set *set; | |
1785e8f4 | 716 | struct ip_set_net *inst = ip_set_pernet(net); |
9076aea7 JK |
717 | |
718 | rcu_read_lock(); | |
719 | /* ip_set_list itself needs to be protected */ | |
1785e8f4 | 720 | set = rcu_dereference(inst->ip_set_list)[index]; |
9076aea7 JK |
721 | rcu_read_unlock(); |
722 | ||
723 | return set; | |
724 | } | |
725 | ||
f66ee041 JK |
726 | static inline void |
727 | ip_set_lock(struct ip_set *set) | |
728 | { | |
729 | if (!set->variant->region_lock) | |
730 | spin_lock_bh(&set->lock); | |
731 | } | |
732 | ||
733 | static inline void | |
734 | ip_set_unlock(struct ip_set *set) | |
735 | { | |
736 | if (!set->variant->region_lock) | |
737 | spin_unlock_bh(&set->lock); | |
738 | } | |
739 | ||
a7b4f989 JK |
740 | int |
741 | ip_set_test(ip_set_id_t index, const struct sk_buff *skb, | |
075e64c0 | 742 | const struct xt_action_param *par, struct ip_set_adt_opt *opt) |
a7b4f989 | 743 | { |
613dbd95 | 744 | struct ip_set *set = ip_set_rcu_get(xt_net(par), index); |
a7b4f989 JK |
745 | int ret = 0; |
746 | ||
ca0f6a5c | 747 | BUG_ON(!set); |
a7b4f989 JK |
748 | pr_debug("set %s, index %u\n", set->name, index); |
749 | ||
ac8cc925 | 750 | if (opt->dim < set->type->dimension || |
c15f1c83 | 751 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
a7b4f989 JK |
752 | return 0; |
753 | ||
b57b2d1f | 754 | rcu_read_lock_bh(); |
b66554cf | 755 | ret = set->variant->kadt(set, skb, par, IPSET_TEST, opt); |
b57b2d1f | 756 | rcu_read_unlock_bh(); |
a7b4f989 JK |
757 | |
758 | if (ret == -EAGAIN) { | |
759 | /* Type requests element to be completed */ | |
1a84db56 | 760 | pr_debug("element must be completed, ADD is triggered\n"); |
f66ee041 | 761 | ip_set_lock(set); |
b66554cf | 762 | set->variant->kadt(set, skb, par, IPSET_ADD, opt); |
f66ee041 | 763 | ip_set_unlock(set); |
a7b4f989 | 764 | ret = 1; |
3e0304a5 JK |
765 | } else { |
766 | /* --return-nomatch: invert matched element */ | |
6e01781d | 767 | if ((opt->cmdflags & IPSET_FLAG_RETURN_NOMATCH) && |
3e0304a5 JK |
768 | (set->type->features & IPSET_TYPE_NOMATCH) && |
769 | (ret > 0 || ret == -ENOTEMPTY)) | |
770 | ret = -ret; | |
a7b4f989 JK |
771 | } |
772 | ||
773 | /* Convert error codes to nomatch */ | |
774 | return (ret < 0 ? 0 : ret); | |
775 | } | |
776 | EXPORT_SYMBOL_GPL(ip_set_test); | |
777 | ||
778 | int | |
779 | ip_set_add(ip_set_id_t index, const struct sk_buff *skb, | |
075e64c0 | 780 | const struct xt_action_param *par, struct ip_set_adt_opt *opt) |
a7b4f989 | 781 | { |
613dbd95 | 782 | struct ip_set *set = ip_set_rcu_get(xt_net(par), index); |
a7b4f989 JK |
783 | int ret; |
784 | ||
ca0f6a5c | 785 | BUG_ON(!set); |
a7b4f989 JK |
786 | pr_debug("set %s, index %u\n", set->name, index); |
787 | ||
ac8cc925 | 788 | if (opt->dim < set->type->dimension || |
c15f1c83 | 789 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
35f6e63a | 790 | return -IPSET_ERR_TYPE_MISMATCH; |
a7b4f989 | 791 | |
f66ee041 | 792 | ip_set_lock(set); |
b66554cf | 793 | ret = set->variant->kadt(set, skb, par, IPSET_ADD, opt); |
f66ee041 | 794 | ip_set_unlock(set); |
a7b4f989 JK |
795 | |
796 | return ret; | |
797 | } | |
798 | EXPORT_SYMBOL_GPL(ip_set_add); | |
799 | ||
800 | int | |
801 | ip_set_del(ip_set_id_t index, const struct sk_buff *skb, | |
075e64c0 | 802 | const struct xt_action_param *par, struct ip_set_adt_opt *opt) |
a7b4f989 | 803 | { |
613dbd95 | 804 | struct ip_set *set = ip_set_rcu_get(xt_net(par), index); |
a7b4f989 JK |
805 | int ret = 0; |
806 | ||
ca0f6a5c | 807 | BUG_ON(!set); |
a7b4f989 JK |
808 | pr_debug("set %s, index %u\n", set->name, index); |
809 | ||
ac8cc925 | 810 | if (opt->dim < set->type->dimension || |
c15f1c83 | 811 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
35f6e63a | 812 | return -IPSET_ERR_TYPE_MISMATCH; |
a7b4f989 | 813 | |
f66ee041 | 814 | ip_set_lock(set); |
b66554cf | 815 | ret = set->variant->kadt(set, skb, par, IPSET_DEL, opt); |
f66ee041 | 816 | ip_set_unlock(set); |
a7b4f989 JK |
817 | |
818 | return ret; | |
819 | } | |
820 | EXPORT_SYMBOL_GPL(ip_set_del); | |
821 | ||
ca0f6a5c | 822 | /* Find set by name, reference it once. The reference makes sure the |
a7b4f989 JK |
823 | * thing pointed to, does not go away under our feet. |
824 | * | |
a7b4f989 JK |
825 | */ |
826 | ip_set_id_t | |
1785e8f4 | 827 | ip_set_get_byname(struct net *net, const char *name, struct ip_set **set) |
a7b4f989 JK |
828 | { |
829 | ip_set_id_t i, index = IPSET_INVALID_ID; | |
830 | struct ip_set *s; | |
1785e8f4 | 831 | struct ip_set_net *inst = ip_set_pernet(net); |
a7b4f989 | 832 | |
9076aea7 | 833 | rcu_read_lock(); |
1785e8f4 VL |
834 | for (i = 0; i < inst->ip_set_max; i++) { |
835 | s = rcu_dereference(inst->ip_set_list)[i]; | |
ca0f6a5c | 836 | if (s && STRNCMP(s->name, name)) { |
9076aea7 | 837 | __ip_set_get(s); |
a7b4f989 JK |
838 | index = i; |
839 | *set = s; | |
9076aea7 | 840 | break; |
a7b4f989 JK |
841 | } |
842 | } | |
9076aea7 | 843 | rcu_read_unlock(); |
a7b4f989 JK |
844 | |
845 | return index; | |
846 | } | |
847 | EXPORT_SYMBOL_GPL(ip_set_get_byname); | |
848 | ||
ca0f6a5c | 849 | /* If the given set pointer points to a valid set, decrement |
a7b4f989 JK |
850 | * reference count by 1. The caller shall not assume the index |
851 | * to be valid, after calling this function. | |
852 | * | |
a7b4f989 | 853 | */ |
1785e8f4 | 854 | |
8dea982a | 855 | static void |
1785e8f4 | 856 | __ip_set_put_byindex(struct ip_set_net *inst, ip_set_id_t index) |
a7b4f989 | 857 | { |
9076aea7 JK |
858 | struct ip_set *set; |
859 | ||
860 | rcu_read_lock(); | |
1785e8f4 | 861 | set = rcu_dereference(inst->ip_set_list)[index]; |
ca0f6a5c | 862 | if (set) |
9076aea7 JK |
863 | __ip_set_put(set); |
864 | rcu_read_unlock(); | |
a7b4f989 | 865 | } |
1785e8f4 VL |
866 | |
867 | void | |
868 | ip_set_put_byindex(struct net *net, ip_set_id_t index) | |
869 | { | |
870 | struct ip_set_net *inst = ip_set_pernet(net); | |
871 | ||
872 | __ip_set_put_byindex(inst, index); | |
873 | } | |
a7b4f989 JK |
874 | EXPORT_SYMBOL_GPL(ip_set_put_byindex); |
875 | ||
ca0f6a5c | 876 | /* Get the name of a set behind a set index. |
439cd39e SB |
877 | * Set itself is protected by RCU, but its name isn't: to protect against |
878 | * renaming, grab ip_set_ref_lock as reader (see ip_set_rename()) and copy the | |
879 | * name. | |
a7b4f989 | 880 | */ |
439cd39e SB |
881 | void |
882 | ip_set_name_byindex(struct net *net, ip_set_id_t index, char *name) | |
a7b4f989 | 883 | { |
439cd39e | 884 | struct ip_set *set = ip_set_rcu_get(net, index); |
a7b4f989 | 885 | |
ca0f6a5c | 886 | BUG_ON(!set); |
a7b4f989 | 887 | |
439cd39e SB |
888 | read_lock_bh(&ip_set_ref_lock); |
889 | strncpy(name, set->name, IPSET_MAXNAMELEN); | |
890 | read_unlock_bh(&ip_set_ref_lock); | |
a7b4f989 JK |
891 | } |
892 | EXPORT_SYMBOL_GPL(ip_set_name_byindex); | |
893 | ||
ca0f6a5c | 894 | /* Routines to call by external subsystems, which do not |
a7b4f989 JK |
895 | * call nfnl_lock for us. |
896 | */ | |
897 | ||
ca0f6a5c | 898 | /* Find set by index, reference it once. The reference makes sure the |
a7b4f989 JK |
899 | * thing pointed to, does not go away under our feet. |
900 | * | |
901 | * The nfnl mutex is used in the function. | |
902 | */ | |
903 | ip_set_id_t | |
1785e8f4 | 904 | ip_set_nfnl_get_byindex(struct net *net, ip_set_id_t index) |
a7b4f989 | 905 | { |
9076aea7 | 906 | struct ip_set *set; |
1785e8f4 | 907 | struct ip_set_net *inst = ip_set_pernet(net); |
9076aea7 | 908 | |
0f9f5e1b | 909 | if (index >= inst->ip_set_max) |
a7b4f989 JK |
910 | return IPSET_INVALID_ID; |
911 | ||
c14b78e7 | 912 | nfnl_lock(NFNL_SUBSYS_IPSET); |
3e90ebd3 | 913 | set = ip_set(inst, index); |
9076aea7 JK |
914 | if (set) |
915 | __ip_set_get(set); | |
a7b4f989 JK |
916 | else |
917 | index = IPSET_INVALID_ID; | |
c14b78e7 | 918 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
919 | |
920 | return index; | |
921 | } | |
922 | EXPORT_SYMBOL_GPL(ip_set_nfnl_get_byindex); | |
923 | ||
ca0f6a5c | 924 | /* If the given set pointer points to a valid set, decrement |
a7b4f989 JK |
925 | * reference count by 1. The caller shall not assume the index |
926 | * to be valid, after calling this function. | |
927 | * | |
928 | * The nfnl mutex is used in the function. | |
929 | */ | |
930 | void | |
1785e8f4 | 931 | ip_set_nfnl_put(struct net *net, ip_set_id_t index) |
a7b4f989 | 932 | { |
9076aea7 | 933 | struct ip_set *set; |
1785e8f4 VL |
934 | struct ip_set_net *inst = ip_set_pernet(net); |
935 | ||
c14b78e7 | 936 | nfnl_lock(NFNL_SUBSYS_IPSET); |
1785e8f4 | 937 | if (!inst->is_deleted) { /* already deleted from ip_set_net_exit() */ |
3e90ebd3 | 938 | set = ip_set(inst, index); |
ca0f6a5c | 939 | if (set) |
1785e8f4 VL |
940 | __ip_set_put(set); |
941 | } | |
c14b78e7 | 942 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
943 | } |
944 | EXPORT_SYMBOL_GPL(ip_set_nfnl_put); | |
945 | ||
ca0f6a5c | 946 | /* Communication protocol with userspace over netlink. |
a7b4f989 | 947 | * |
2f9f28b2 | 948 | * The commands are serialized by the nfnl mutex. |
a7b4f989 JK |
949 | */ |
950 | ||
23c42a40 JK |
951 | static inline u8 protocol(const struct nlattr * const tb[]) |
952 | { | |
953 | return nla_get_u8(tb[IPSET_ATTR_PROTOCOL]); | |
954 | } | |
955 | ||
a7b4f989 JK |
956 | static inline bool |
957 | protocol_failed(const struct nlattr * const tb[]) | |
958 | { | |
23c42a40 JK |
959 | return !tb[IPSET_ATTR_PROTOCOL] || protocol(tb) != IPSET_PROTOCOL; |
960 | } | |
961 | ||
962 | static inline bool | |
963 | protocol_min_failed(const struct nlattr * const tb[]) | |
964 | { | |
965 | return !tb[IPSET_ATTR_PROTOCOL] || protocol(tb) < IPSET_PROTOCOL_MIN; | |
a7b4f989 JK |
966 | } |
967 | ||
968 | static inline u32 | |
969 | flag_exist(const struct nlmsghdr *nlh) | |
970 | { | |
971 | return nlh->nlmsg_flags & NLM_F_EXCL ? 0 : IPSET_FLAG_EXIST; | |
972 | } | |
973 | ||
974 | static struct nlmsghdr * | |
15e47304 | 975 | start_msg(struct sk_buff *skb, u32 portid, u32 seq, unsigned int flags, |
a7b4f989 JK |
976 | enum ipset_cmd cmd) |
977 | { | |
978 | struct nlmsghdr *nlh; | |
979 | struct nfgenmsg *nfmsg; | |
980 | ||
dedb67c4 | 981 | nlh = nlmsg_put(skb, portid, seq, nfnl_msg_type(NFNL_SUBSYS_IPSET, cmd), |
a7b4f989 | 982 | sizeof(*nfmsg), flags); |
ca0f6a5c | 983 | if (!nlh) |
a7b4f989 JK |
984 | return NULL; |
985 | ||
986 | nfmsg = nlmsg_data(nlh); | |
c15f1c83 | 987 | nfmsg->nfgen_family = NFPROTO_IPV4; |
a7b4f989 JK |
988 | nfmsg->version = NFNETLINK_V0; |
989 | nfmsg->res_id = 0; | |
990 | ||
991 | return nlh; | |
992 | } | |
993 | ||
994 | /* Create a set */ | |
995 | ||
996 | static const struct nla_policy ip_set_create_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
997 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
998 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
999 | .len = IPSET_MAXNAMELEN - 1 }, | |
1000 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, | |
1001 | .len = IPSET_MAXNAMELEN - 1}, | |
1002 | [IPSET_ATTR_REVISION] = { .type = NLA_U8 }, | |
1003 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, | |
1004 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, | |
1005 | }; | |
1006 | ||
9076aea7 | 1007 | static struct ip_set * |
1785e8f4 | 1008 | find_set_and_id(struct ip_set_net *inst, const char *name, ip_set_id_t *id) |
a7b4f989 | 1009 | { |
9076aea7 JK |
1010 | struct ip_set *set = NULL; |
1011 | ip_set_id_t i; | |
a7b4f989 | 1012 | |
9076aea7 | 1013 | *id = IPSET_INVALID_ID; |
1785e8f4 | 1014 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 1015 | set = ip_set(inst, i); |
ca0f6a5c | 1016 | if (set && STRNCMP(set->name, name)) { |
9076aea7 JK |
1017 | *id = i; |
1018 | break; | |
1019 | } | |
a7b4f989 | 1020 | } |
9076aea7 | 1021 | return (*id == IPSET_INVALID_ID ? NULL : set); |
a7b4f989 JK |
1022 | } |
1023 | ||
1024 | static inline struct ip_set * | |
1785e8f4 | 1025 | find_set(struct ip_set_net *inst, const char *name) |
a7b4f989 | 1026 | { |
9076aea7 | 1027 | ip_set_id_t id; |
a7b4f989 | 1028 | |
1785e8f4 | 1029 | return find_set_and_id(inst, name, &id); |
a7b4f989 JK |
1030 | } |
1031 | ||
1032 | static int | |
1785e8f4 VL |
1033 | find_free_id(struct ip_set_net *inst, const char *name, ip_set_id_t *index, |
1034 | struct ip_set **set) | |
a7b4f989 | 1035 | { |
9076aea7 | 1036 | struct ip_set *s; |
a7b4f989 JK |
1037 | ip_set_id_t i; |
1038 | ||
1039 | *index = IPSET_INVALID_ID; | |
1785e8f4 | 1040 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 1041 | s = ip_set(inst, i); |
ca0f6a5c | 1042 | if (!s) { |
a7b4f989 JK |
1043 | if (*index == IPSET_INVALID_ID) |
1044 | *index = i; | |
22496f09 | 1045 | } else if (STRNCMP(name, s->name)) { |
a7b4f989 | 1046 | /* Name clash */ |
9076aea7 | 1047 | *set = s; |
a7b4f989 JK |
1048 | return -EEXIST; |
1049 | } | |
1050 | } | |
1051 | if (*index == IPSET_INVALID_ID) | |
1052 | /* No free slot remained */ | |
1053 | return -IPSET_ERR_MAX_SETS; | |
1054 | return 0; | |
1055 | } | |
1056 | ||
7b8002a1 PNA |
1057 | static int ip_set_none(struct net *net, struct sock *ctnl, struct sk_buff *skb, |
1058 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
1059 | const struct nlattr * const attr[], |
1060 | struct netlink_ext_ack *extack) | |
d31f4d44 TB |
1061 | { |
1062 | return -EOPNOTSUPP; | |
1063 | } | |
1064 | ||
7b8002a1 PNA |
1065 | static int ip_set_create(struct net *net, struct sock *ctnl, |
1066 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1067 | const struct nlattr * const attr[], |
1068 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1069 | { |
1785e8f4 | 1070 | struct ip_set_net *inst = ip_set_pernet(net); |
9846ada1 | 1071 | struct ip_set *set, *clash = NULL; |
a7b4f989 | 1072 | ip_set_id_t index = IPSET_INVALID_ID; |
ca0f6a5c | 1073 | struct nlattr *tb[IPSET_ATTR_CREATE_MAX + 1] = {}; |
a7b4f989 JK |
1074 | const char *name, *typename; |
1075 | u8 family, revision; | |
1076 | u32 flags = flag_exist(nlh); | |
1077 | int ret = 0; | |
1078 | ||
23c42a40 | 1079 | if (unlikely(protocol_min_failed(attr) || |
ca0f6a5c JK |
1080 | !attr[IPSET_ATTR_SETNAME] || |
1081 | !attr[IPSET_ATTR_TYPENAME] || | |
1082 | !attr[IPSET_ATTR_REVISION] || | |
1083 | !attr[IPSET_ATTR_FAMILY] || | |
1084 | (attr[IPSET_ATTR_DATA] && | |
a7b4f989 JK |
1085 | !flag_nested(attr[IPSET_ATTR_DATA])))) |
1086 | return -IPSET_ERR_PROTOCOL; | |
1087 | ||
1088 | name = nla_data(attr[IPSET_ATTR_SETNAME]); | |
1089 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); | |
1090 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); | |
1091 | revision = nla_get_u8(attr[IPSET_ATTR_REVISION]); | |
1092 | pr_debug("setname: %s, typename: %s, family: %s, revision: %u\n", | |
1093 | name, typename, family_name(family), revision); | |
1094 | ||
ca0f6a5c | 1095 | /* First, and without any locks, allocate and initialize |
a7b4f989 JK |
1096 | * a normal base set structure. |
1097 | */ | |
ca0f6a5c | 1098 | set = kzalloc(sizeof(*set), GFP_KERNEL); |
a7b4f989 JK |
1099 | if (!set) |
1100 | return -ENOMEM; | |
b57b2d1f | 1101 | spin_lock_init(&set->lock); |
a7b4f989 | 1102 | strlcpy(set->name, name, IPSET_MAXNAMELEN); |
a7b4f989 | 1103 | set->family = family; |
f1e00b39 | 1104 | set->revision = revision; |
a7b4f989 | 1105 | |
ca0f6a5c | 1106 | /* Next, check that we know the type, and take |
a7b4f989 JK |
1107 | * a reference on the type, to make sure it stays available |
1108 | * while constructing our new set. | |
1109 | * | |
1110 | * After referencing the type, we try to create the type | |
1111 | * specific part of the set without holding any locks. | |
1112 | */ | |
ca0f6a5c | 1113 | ret = find_set_type_get(typename, family, revision, &set->type); |
a7b4f989 JK |
1114 | if (ret) |
1115 | goto out; | |
1116 | ||
ca0f6a5c | 1117 | /* Without holding any locks, create private part. */ |
a7b4f989 | 1118 | if (attr[IPSET_ATTR_DATA] && |
12899756 JK |
1119 | nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA], |
1120 | set->type->create_policy, NULL)) { | |
15b4d93f JK |
1121 | ret = -IPSET_ERR_PROTOCOL; |
1122 | goto put_out; | |
a7b4f989 JK |
1123 | } |
1124 | ||
1785e8f4 | 1125 | ret = set->type->create(net, set, tb, flags); |
a7b4f989 JK |
1126 | if (ret != 0) |
1127 | goto put_out; | |
1128 | ||
1129 | /* BTW, ret==0 here. */ | |
1130 | ||
ca0f6a5c | 1131 | /* Here, we have a valid, constructed set and we are protected |
2f9f28b2 JK |
1132 | * by the nfnl mutex. Find the first free index in ip_set_list |
1133 | * and check clashing. | |
a7b4f989 | 1134 | */ |
1785e8f4 | 1135 | ret = find_free_id(inst, set->name, &index, &clash); |
9076aea7 | 1136 | if (ret == -EEXIST) { |
a7b4f989 | 1137 | /* If this is the same set and requested, ignore error */ |
9076aea7 | 1138 | if ((flags & IPSET_FLAG_EXIST) && |
22496f09 | 1139 | STRNCMP(set->type->name, clash->type->name) && |
a7b4f989 | 1140 | set->type->family == clash->type->family && |
f1e00b39 JK |
1141 | set->type->revision_min == clash->type->revision_min && |
1142 | set->type->revision_max == clash->type->revision_max && | |
a7b4f989 JK |
1143 | set->variant->same_set(set, clash)) |
1144 | ret = 0; | |
1145 | goto cleanup; | |
9076aea7 JK |
1146 | } else if (ret == -IPSET_ERR_MAX_SETS) { |
1147 | struct ip_set **list, **tmp; | |
1785e8f4 | 1148 | ip_set_id_t i = inst->ip_set_max + IP_SET_INC; |
9076aea7 | 1149 | |
1785e8f4 | 1150 | if (i < inst->ip_set_max || i == IPSET_INVALID_ID) |
9076aea7 JK |
1151 | /* Wraparound */ |
1152 | goto cleanup; | |
1153 | ||
ed956f39 | 1154 | list = kvcalloc(i, sizeof(struct ip_set *), GFP_KERNEL); |
9076aea7 JK |
1155 | if (!list) |
1156 | goto cleanup; | |
1157 | /* nfnl mutex is held, both lists are valid */ | |
3e90ebd3 | 1158 | tmp = ip_set_dereference(inst->ip_set_list); |
1785e8f4 VL |
1159 | memcpy(list, tmp, sizeof(struct ip_set *) * inst->ip_set_max); |
1160 | rcu_assign_pointer(inst->ip_set_list, list); | |
9076aea7 JK |
1161 | /* Make sure all current packets have passed through */ |
1162 | synchronize_net(); | |
1163 | /* Use new list */ | |
1785e8f4 VL |
1164 | index = inst->ip_set_max; |
1165 | inst->ip_set_max = i; | |
ed956f39 | 1166 | kvfree(tmp); |
9076aea7 | 1167 | ret = 0; |
ca0f6a5c | 1168 | } else if (ret) { |
9076aea7 | 1169 | goto cleanup; |
ca0f6a5c | 1170 | } |
a7b4f989 | 1171 | |
ca0f6a5c | 1172 | /* Finally! Add our shiny new set to the list, and be done. */ |
a7b4f989 | 1173 | pr_debug("create: '%s' created with index %u!\n", set->name, index); |
3e90ebd3 | 1174 | ip_set(inst, index) = set; |
a7b4f989 JK |
1175 | |
1176 | return ret; | |
1177 | ||
1178 | cleanup: | |
1179 | set->variant->destroy(set); | |
1180 | put_out: | |
1181 | module_put(set->type->me); | |
1182 | out: | |
1183 | kfree(set); | |
1184 | return ret; | |
1185 | } | |
1186 | ||
1187 | /* Destroy sets */ | |
1188 | ||
1189 | static const struct nla_policy | |
1190 | ip_set_setname_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1191 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1192 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
1193 | .len = IPSET_MAXNAMELEN - 1 }, | |
1194 | }; | |
1195 | ||
1196 | static void | |
9c1ba5c8 | 1197 | ip_set_destroy_set(struct ip_set *set) |
a7b4f989 | 1198 | { |
a7b4f989 | 1199 | pr_debug("set: %s\n", set->name); |
a7b4f989 JK |
1200 | |
1201 | /* Must call it without holding any lock */ | |
1202 | set->variant->destroy(set); | |
1203 | module_put(set->type->me); | |
1204 | kfree(set); | |
1205 | } | |
1206 | ||
7b8002a1 PNA |
1207 | static int ip_set_destroy(struct net *net, struct sock *ctnl, |
1208 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1209 | const struct nlattr * const attr[], |
1210 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1211 | { |
7b8002a1 | 1212 | struct ip_set_net *inst = ip_set_pernet(net); |
9076aea7 | 1213 | struct ip_set *s; |
a7b4f989 | 1214 | ip_set_id_t i; |
2f9f28b2 | 1215 | int ret = 0; |
a7b4f989 | 1216 | |
23c42a40 | 1217 | if (unlikely(protocol_min_failed(attr))) |
a7b4f989 JK |
1218 | return -IPSET_ERR_PROTOCOL; |
1219 | ||
45040978 JK |
1220 | /* Must wait for flush to be really finished in list:set */ |
1221 | rcu_barrier(); | |
1222 | ||
2f9f28b2 JK |
1223 | /* Commands are serialized and references are |
1224 | * protected by the ip_set_ref_lock. | |
1225 | * External systems (i.e. xt_set) must call | |
1226 | * ip_set_put|get_nfnl_* functions, that way we | |
1227 | * can safely check references here. | |
1228 | * | |
1229 | * list:set timer can only decrement the reference | |
1230 | * counter, so if it's already zero, we can proceed | |
1231 | * without holding the lock. | |
1232 | */ | |
1233 | read_lock_bh(&ip_set_ref_lock); | |
a7b4f989 | 1234 | if (!attr[IPSET_ATTR_SETNAME]) { |
1785e8f4 | 1235 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 1236 | s = ip_set(inst, i); |
596cf3fe | 1237 | if (s && (s->ref || s->ref_netlink)) { |
9d883232 | 1238 | ret = -IPSET_ERR_BUSY; |
2f9f28b2 JK |
1239 | goto out; |
1240 | } | |
a7b4f989 | 1241 | } |
9c1ba5c8 | 1242 | inst->is_destroyed = true; |
2f9f28b2 | 1243 | read_unlock_bh(&ip_set_ref_lock); |
1785e8f4 | 1244 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 1245 | s = ip_set(inst, i); |
9c1ba5c8 JK |
1246 | if (s) { |
1247 | ip_set(inst, i) = NULL; | |
1248 | ip_set_destroy_set(s); | |
1249 | } | |
a7b4f989 | 1250 | } |
9c1ba5c8 JK |
1251 | /* Modified by ip_set_destroy() only, which is serialized */ |
1252 | inst->is_destroyed = false; | |
a7b4f989 | 1253 | } else { |
1785e8f4 VL |
1254 | s = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), |
1255 | &i); | |
ca0f6a5c | 1256 | if (!s) { |
2f9f28b2 JK |
1257 | ret = -ENOENT; |
1258 | goto out; | |
596cf3fe | 1259 | } else if (s->ref || s->ref_netlink) { |
2f9f28b2 JK |
1260 | ret = -IPSET_ERR_BUSY; |
1261 | goto out; | |
1262 | } | |
9c1ba5c8 | 1263 | ip_set(inst, i) = NULL; |
2f9f28b2 | 1264 | read_unlock_bh(&ip_set_ref_lock); |
a7b4f989 | 1265 | |
9c1ba5c8 | 1266 | ip_set_destroy_set(s); |
a7b4f989 JK |
1267 | } |
1268 | return 0; | |
2f9f28b2 JK |
1269 | out: |
1270 | read_unlock_bh(&ip_set_ref_lock); | |
1271 | return ret; | |
a7b4f989 JK |
1272 | } |
1273 | ||
1274 | /* Flush sets */ | |
1275 | ||
1276 | static void | |
1277 | ip_set_flush_set(struct ip_set *set) | |
1278 | { | |
1279 | pr_debug("set: %s\n", set->name); | |
1280 | ||
f66ee041 | 1281 | ip_set_lock(set); |
a7b4f989 | 1282 | set->variant->flush(set); |
f66ee041 | 1283 | ip_set_unlock(set); |
a7b4f989 JK |
1284 | } |
1285 | ||
7b8002a1 PNA |
1286 | static int ip_set_flush(struct net *net, struct sock *ctnl, struct sk_buff *skb, |
1287 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
1288 | const struct nlattr * const attr[], |
1289 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1290 | { |
7b8002a1 | 1291 | struct ip_set_net *inst = ip_set_pernet(net); |
9076aea7 | 1292 | struct ip_set *s; |
a7b4f989 JK |
1293 | ip_set_id_t i; |
1294 | ||
23c42a40 | 1295 | if (unlikely(protocol_min_failed(attr))) |
9184a9cb | 1296 | return -IPSET_ERR_PROTOCOL; |
a7b4f989 JK |
1297 | |
1298 | if (!attr[IPSET_ATTR_SETNAME]) { | |
1785e8f4 | 1299 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 1300 | s = ip_set(inst, i); |
ca0f6a5c | 1301 | if (s) |
9076aea7 JK |
1302 | ip_set_flush_set(s); |
1303 | } | |
a7b4f989 | 1304 | } else { |
1785e8f4 | 1305 | s = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
ca0f6a5c | 1306 | if (!s) |
a7b4f989 JK |
1307 | return -ENOENT; |
1308 | ||
9076aea7 | 1309 | ip_set_flush_set(s); |
a7b4f989 JK |
1310 | } |
1311 | ||
1312 | return 0; | |
1313 | } | |
1314 | ||
1315 | /* Rename a set */ | |
1316 | ||
1317 | static const struct nla_policy | |
1318 | ip_set_setname2_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1319 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1320 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
1321 | .len = IPSET_MAXNAMELEN - 1 }, | |
1322 | [IPSET_ATTR_SETNAME2] = { .type = NLA_NUL_STRING, | |
1323 | .len = IPSET_MAXNAMELEN - 1 }, | |
1324 | }; | |
1325 | ||
7b8002a1 PNA |
1326 | static int ip_set_rename(struct net *net, struct sock *ctnl, |
1327 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1328 | const struct nlattr * const attr[], |
1329 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1330 | { |
7b8002a1 | 1331 | struct ip_set_net *inst = ip_set_pernet(net); |
9076aea7 | 1332 | struct ip_set *set, *s; |
a7b4f989 JK |
1333 | const char *name2; |
1334 | ip_set_id_t i; | |
2f9f28b2 | 1335 | int ret = 0; |
a7b4f989 | 1336 | |
23c42a40 | 1337 | if (unlikely(protocol_min_failed(attr) || |
ca0f6a5c JK |
1338 | !attr[IPSET_ATTR_SETNAME] || |
1339 | !attr[IPSET_ATTR_SETNAME2])) | |
a7b4f989 JK |
1340 | return -IPSET_ERR_PROTOCOL; |
1341 | ||
1785e8f4 | 1342 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
ca0f6a5c | 1343 | if (!set) |
a7b4f989 | 1344 | return -ENOENT; |
2f9f28b2 | 1345 | |
439cd39e | 1346 | write_lock_bh(&ip_set_ref_lock); |
6c1f7e2c | 1347 | if (set->ref != 0 || set->ref_netlink != 0) { |
2f9f28b2 JK |
1348 | ret = -IPSET_ERR_REFERENCED; |
1349 | goto out; | |
1350 | } | |
a7b4f989 JK |
1351 | |
1352 | name2 = nla_data(attr[IPSET_ATTR_SETNAME2]); | |
1785e8f4 | 1353 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 1354 | s = ip_set(inst, i); |
ca0f6a5c | 1355 | if (s && STRNCMP(s->name, name2)) { |
2f9f28b2 JK |
1356 | ret = -IPSET_ERR_EXIST_SETNAME2; |
1357 | goto out; | |
1358 | } | |
a7b4f989 JK |
1359 | } |
1360 | strncpy(set->name, name2, IPSET_MAXNAMELEN); | |
1361 | ||
2f9f28b2 | 1362 | out: |
439cd39e | 1363 | write_unlock_bh(&ip_set_ref_lock); |
2f9f28b2 | 1364 | return ret; |
a7b4f989 JK |
1365 | } |
1366 | ||
1367 | /* Swap two sets so that name/index points to the other. | |
1368 | * References and set names are also swapped. | |
1369 | * | |
2f9f28b2 JK |
1370 | * The commands are serialized by the nfnl mutex and references are |
1371 | * protected by the ip_set_ref_lock. The kernel interfaces | |
a7b4f989 JK |
1372 | * do not hold the mutex but the pointer settings are atomic |
1373 | * so the ip_set_list always contains valid pointers to the sets. | |
1374 | */ | |
1375 | ||
7b8002a1 PNA |
1376 | static int ip_set_swap(struct net *net, struct sock *ctnl, struct sk_buff *skb, |
1377 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
1378 | const struct nlattr * const attr[], |
1379 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1380 | { |
7b8002a1 | 1381 | struct ip_set_net *inst = ip_set_pernet(net); |
a7b4f989 JK |
1382 | struct ip_set *from, *to; |
1383 | ip_set_id_t from_id, to_id; | |
1384 | char from_name[IPSET_MAXNAMELEN]; | |
a7b4f989 | 1385 | |
23c42a40 | 1386 | if (unlikely(protocol_min_failed(attr) || |
ca0f6a5c JK |
1387 | !attr[IPSET_ATTR_SETNAME] || |
1388 | !attr[IPSET_ATTR_SETNAME2])) | |
a7b4f989 JK |
1389 | return -IPSET_ERR_PROTOCOL; |
1390 | ||
1785e8f4 VL |
1391 | from = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), |
1392 | &from_id); | |
ca0f6a5c | 1393 | if (!from) |
a7b4f989 JK |
1394 | return -ENOENT; |
1395 | ||
1785e8f4 VL |
1396 | to = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME2]), |
1397 | &to_id); | |
ca0f6a5c | 1398 | if (!to) |
a7b4f989 JK |
1399 | return -IPSET_ERR_EXIST_SETNAME2; |
1400 | ||
a7b4f989 | 1401 | /* Features must not change. |
ca0f6a5c JK |
1402 | * Not an artifical restriction anymore, as we must prevent |
1403 | * possible loops created by swapping in setlist type of sets. | |
1404 | */ | |
a7b4f989 | 1405 | if (!(from->type->features == to->type->features && |
169faa2e | 1406 | from->family == to->family)) |
a7b4f989 JK |
1407 | return -IPSET_ERR_TYPE_MISMATCH; |
1408 | ||
e5173418 RL |
1409 | write_lock_bh(&ip_set_ref_lock); |
1410 | ||
1411 | if (from->ref_netlink || to->ref_netlink) { | |
1412 | write_unlock_bh(&ip_set_ref_lock); | |
596cf3fe | 1413 | return -EBUSY; |
e5173418 | 1414 | } |
596cf3fe | 1415 | |
a7b4f989 | 1416 | strncpy(from_name, from->name, IPSET_MAXNAMELEN); |
a7b4f989 | 1417 | strncpy(from->name, to->name, IPSET_MAXNAMELEN); |
a7b4f989 | 1418 | strncpy(to->name, from_name, IPSET_MAXNAMELEN); |
a7b4f989 | 1419 | |
2f9f28b2 | 1420 | swap(from->ref, to->ref); |
3e90ebd3 PM |
1421 | ip_set(inst, from_id) = to; |
1422 | ip_set(inst, to_id) = from; | |
2f9f28b2 | 1423 | write_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
1424 | |
1425 | return 0; | |
1426 | } | |
1427 | ||
1428 | /* List/save set data */ | |
1429 | ||
c1e2e043 JK |
1430 | #define DUMP_INIT 0 |
1431 | #define DUMP_ALL 1 | |
1432 | #define DUMP_ONE 2 | |
1433 | #define DUMP_LAST 3 | |
1434 | ||
1435 | #define DUMP_TYPE(arg) (((u32)(arg)) & 0x0000FFFF) | |
1436 | #define DUMP_FLAGS(arg) (((u32)(arg)) >> 16) | |
a7b4f989 | 1437 | |
85639185 JS |
1438 | int |
1439 | ip_set_put_flags(struct sk_buff *skb, struct ip_set *set) | |
1440 | { | |
1441 | u32 cadt_flags = 0; | |
1442 | ||
1443 | if (SET_WITH_TIMEOUT(set)) | |
1444 | if (unlikely(nla_put_net32(skb, IPSET_ATTR_TIMEOUT, | |
1445 | htonl(set->timeout)))) | |
1446 | return -EMSGSIZE; | |
1447 | if (SET_WITH_COUNTER(set)) | |
1448 | cadt_flags |= IPSET_FLAG_WITH_COUNTERS; | |
1449 | if (SET_WITH_COMMENT(set)) | |
1450 | cadt_flags |= IPSET_FLAG_WITH_COMMENT; | |
1451 | if (SET_WITH_SKBINFO(set)) | |
1452 | cadt_flags |= IPSET_FLAG_WITH_SKBINFO; | |
1453 | if (SET_WITH_FORCEADD(set)) | |
1454 | cadt_flags |= IPSET_FLAG_WITH_FORCEADD; | |
1455 | ||
1456 | if (!cadt_flags) | |
1457 | return 0; | |
1458 | return nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(cadt_flags)); | |
1459 | } | |
1460 | EXPORT_SYMBOL_GPL(ip_set_put_flags); | |
1461 | ||
a7b4f989 JK |
1462 | static int |
1463 | ip_set_dump_done(struct netlink_callback *cb) | |
1464 | { | |
93302880 | 1465 | if (cb->args[IPSET_CB_ARG0]) { |
c4c99783 JK |
1466 | struct ip_set_net *inst = |
1467 | (struct ip_set_net *)cb->args[IPSET_CB_NET]; | |
1468 | ip_set_id_t index = (ip_set_id_t)cb->args[IPSET_CB_INDEX]; | |
8a02bdd5 | 1469 | struct ip_set *set = ip_set_ref_netlink(inst, index); |
c4c99783 JK |
1470 | |
1471 | if (set->variant->uref) | |
1472 | set->variant->uref(set, cb, false); | |
1473 | pr_debug("release set %s\n", set->name); | |
596cf3fe | 1474 | __ip_set_put_netlink(set); |
a7b4f989 JK |
1475 | } |
1476 | return 0; | |
1477 | } | |
1478 | ||
1479 | static inline void | |
1480 | dump_attrs(struct nlmsghdr *nlh) | |
1481 | { | |
1482 | const struct nlattr *attr; | |
1483 | int rem; | |
1484 | ||
1485 | pr_debug("dump nlmsg\n"); | |
1486 | nlmsg_for_each_attr(attr, nlh, sizeof(struct nfgenmsg), rem) { | |
1487 | pr_debug("type: %u, len %u\n", nla_type(attr), attr->nla_len); | |
1488 | } | |
1489 | } | |
1490 | ||
12899756 JK |
1491 | static const struct nla_policy |
1492 | ip_set_dump_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1493 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1494 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
1495 | .len = IPSET_MAXNAMELEN - 1 }, | |
1496 | [IPSET_ATTR_FLAGS] = { .type = NLA_U32 }, | |
1497 | }; | |
1498 | ||
a7b4f989 | 1499 | static int |
50385171 | 1500 | ip_set_dump_start(struct netlink_callback *cb) |
a7b4f989 JK |
1501 | { |
1502 | struct nlmsghdr *nlh = nlmsg_hdr(cb->skb); | |
573ce260 | 1503 | int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); |
ca0f6a5c | 1504 | struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1]; |
a7b4f989 | 1505 | struct nlattr *attr = (void *)nlh + min_len; |
50385171 KJ |
1506 | struct sk_buff *skb = cb->skb; |
1507 | struct ip_set_net *inst = ip_set_pernet(sock_net(skb->sk)); | |
c1e2e043 | 1508 | u32 dump_type; |
13c6ba1f | 1509 | int ret; |
a7b4f989 | 1510 | |
12899756 JK |
1511 | ret = nla_parse(cda, IPSET_ATTR_CMD_MAX, attr, |
1512 | nlh->nlmsg_len - min_len, | |
1513 | ip_set_dump_policy, NULL); | |
13c6ba1f | 1514 | if (ret) |
50385171 | 1515 | goto error; |
a7b4f989 | 1516 | |
23c42a40 | 1517 | cb->args[IPSET_CB_PROTO] = nla_get_u8(cda[IPSET_ATTR_PROTOCOL]); |
c1e2e043 | 1518 | if (cda[IPSET_ATTR_SETNAME]) { |
50385171 | 1519 | ip_set_id_t index; |
9076aea7 JK |
1520 | struct ip_set *set; |
1521 | ||
1785e8f4 | 1522 | set = find_set_and_id(inst, nla_data(cda[IPSET_ATTR_SETNAME]), |
9076aea7 | 1523 | &index); |
50385171 KJ |
1524 | if (!set) { |
1525 | ret = -ENOENT; | |
1526 | goto error; | |
1527 | } | |
c1e2e043 | 1528 | dump_type = DUMP_ONE; |
93302880 | 1529 | cb->args[IPSET_CB_INDEX] = index; |
ca0f6a5c | 1530 | } else { |
c1e2e043 | 1531 | dump_type = DUMP_ALL; |
ca0f6a5c | 1532 | } |
c1e2e043 JK |
1533 | |
1534 | if (cda[IPSET_ATTR_FLAGS]) { | |
1535 | u32 f = ip_set_get_h32(cda[IPSET_ATTR_FLAGS]); | |
ca0f6a5c | 1536 | |
c1e2e043 JK |
1537 | dump_type |= (f << 16); |
1538 | } | |
93302880 JK |
1539 | cb->args[IPSET_CB_NET] = (unsigned long)inst; |
1540 | cb->args[IPSET_CB_DUMP] = dump_type; | |
a7b4f989 | 1541 | |
a7b4f989 | 1542 | return 0; |
50385171 KJ |
1543 | |
1544 | error: | |
1545 | /* We have to create and send the error message manually :-( */ | |
1546 | if (nlh->nlmsg_flags & NLM_F_ACK) { | |
1547 | netlink_ack(cb->skb, nlh, ret, NULL); | |
1548 | } | |
1549 | return ret; | |
a7b4f989 JK |
1550 | } |
1551 | ||
1552 | static int | |
50385171 | 1553 | ip_set_dump_do(struct sk_buff *skb, struct netlink_callback *cb) |
a7b4f989 JK |
1554 | { |
1555 | ip_set_id_t index = IPSET_INVALID_ID, max; | |
1556 | struct ip_set *set = NULL; | |
1557 | struct nlmsghdr *nlh = NULL; | |
15e47304 | 1558 | unsigned int flags = NETLINK_CB(cb->skb).portid ? NLM_F_MULTI : 0; |
93302880 | 1559 | struct ip_set_net *inst = ip_set_pernet(sock_net(skb->sk)); |
c1e2e043 | 1560 | u32 dump_type, dump_flags; |
9c1ba5c8 | 1561 | bool is_destroyed; |
a7b4f989 JK |
1562 | int ret = 0; |
1563 | ||
50385171 KJ |
1564 | if (!cb->args[IPSET_CB_DUMP]) |
1565 | return -EINVAL; | |
a7b4f989 | 1566 | |
93302880 | 1567 | if (cb->args[IPSET_CB_INDEX] >= inst->ip_set_max) |
a7b4f989 JK |
1568 | goto out; |
1569 | ||
93302880 JK |
1570 | dump_type = DUMP_TYPE(cb->args[IPSET_CB_DUMP]); |
1571 | dump_flags = DUMP_FLAGS(cb->args[IPSET_CB_DUMP]); | |
1572 | max = dump_type == DUMP_ONE ? cb->args[IPSET_CB_INDEX] + 1 | |
1573 | : inst->ip_set_max; | |
a8a8a093 | 1574 | dump_last: |
93302880 JK |
1575 | pr_debug("dump type, flag: %u %u index: %ld\n", |
1576 | dump_type, dump_flags, cb->args[IPSET_CB_INDEX]); | |
1577 | for (; cb->args[IPSET_CB_INDEX] < max; cb->args[IPSET_CB_INDEX]++) { | |
ca0f6a5c | 1578 | index = (ip_set_id_t)cb->args[IPSET_CB_INDEX]; |
9c1ba5c8 | 1579 | write_lock_bh(&ip_set_ref_lock); |
3e90ebd3 | 1580 | set = ip_set(inst, index); |
9c1ba5c8 JK |
1581 | is_destroyed = inst->is_destroyed; |
1582 | if (!set || is_destroyed) { | |
1583 | write_unlock_bh(&ip_set_ref_lock); | |
c1e2e043 | 1584 | if (dump_type == DUMP_ONE) { |
a7b4f989 JK |
1585 | ret = -ENOENT; |
1586 | goto out; | |
1587 | } | |
9c1ba5c8 JK |
1588 | if (is_destroyed) { |
1589 | /* All sets are just being destroyed */ | |
1590 | ret = 0; | |
1591 | goto out; | |
1592 | } | |
a7b4f989 JK |
1593 | continue; |
1594 | } | |
1595 | /* When dumping all sets, we must dump "sorted" | |
1596 | * so that lists (unions of sets) are dumped last. | |
1597 | */ | |
c1e2e043 JK |
1598 | if (dump_type != DUMP_ONE && |
1599 | ((dump_type == DUMP_ALL) == | |
9c1ba5c8 JK |
1600 | !!(set->type->features & IPSET_DUMP_LAST))) { |
1601 | write_unlock_bh(&ip_set_ref_lock); | |
a7b4f989 | 1602 | continue; |
9c1ba5c8 | 1603 | } |
a7b4f989 | 1604 | pr_debug("List set: %s\n", set->name); |
93302880 | 1605 | if (!cb->args[IPSET_CB_ARG0]) { |
a7b4f989 JK |
1606 | /* Start listing: make sure set won't be destroyed */ |
1607 | pr_debug("reference set\n"); | |
596cf3fe | 1608 | set->ref_netlink++; |
a7b4f989 | 1609 | } |
9c1ba5c8 | 1610 | write_unlock_bh(&ip_set_ref_lock); |
15e47304 | 1611 | nlh = start_msg(skb, NETLINK_CB(cb->skb).portid, |
a7b4f989 JK |
1612 | cb->nlh->nlmsg_seq, flags, |
1613 | IPSET_CMD_LIST); | |
1614 | if (!nlh) { | |
1615 | ret = -EMSGSIZE; | |
1616 | goto release_refcount; | |
1617 | } | |
23c42a40 JK |
1618 | if (nla_put_u8(skb, IPSET_ATTR_PROTOCOL, |
1619 | cb->args[IPSET_CB_PROTO]) || | |
7cf7899d DM |
1620 | nla_put_string(skb, IPSET_ATTR_SETNAME, set->name)) |
1621 | goto nla_put_failure; | |
c1e2e043 JK |
1622 | if (dump_flags & IPSET_FLAG_LIST_SETNAME) |
1623 | goto next_set; | |
93302880 | 1624 | switch (cb->args[IPSET_CB_ARG0]) { |
a7b4f989 JK |
1625 | case 0: |
1626 | /* Core header data */ | |
7cf7899d DM |
1627 | if (nla_put_string(skb, IPSET_ATTR_TYPENAME, |
1628 | set->type->name) || | |
1629 | nla_put_u8(skb, IPSET_ATTR_FAMILY, | |
1630 | set->family) || | |
1631 | nla_put_u8(skb, IPSET_ATTR_REVISION, | |
1632 | set->revision)) | |
1633 | goto nla_put_failure; | |
23c42a40 JK |
1634 | if (cb->args[IPSET_CB_PROTO] > IPSET_PROTOCOL_MIN && |
1635 | nla_put_net16(skb, IPSET_ATTR_INDEX, htons(index))) | |
1636 | goto nla_put_failure; | |
a7b4f989 JK |
1637 | ret = set->variant->head(set, skb); |
1638 | if (ret < 0) | |
1639 | goto release_refcount; | |
c1e2e043 JK |
1640 | if (dump_flags & IPSET_FLAG_LIST_HEADER) |
1641 | goto next_set; | |
c4c99783 JK |
1642 | if (set->variant->uref) |
1643 | set->variant->uref(set, cb, true); | |
e8542dce | 1644 | /* fall through */ |
a7b4f989 | 1645 | default: |
a7b4f989 | 1646 | ret = set->variant->list(set, skb, cb); |
93302880 | 1647 | if (!cb->args[IPSET_CB_ARG0]) |
a7b4f989 | 1648 | /* Set is done, proceed with next one */ |
c1e2e043 | 1649 | goto next_set; |
a7b4f989 JK |
1650 | goto release_refcount; |
1651 | } | |
1652 | } | |
a8a8a093 | 1653 | /* If we dump all sets, continue with dumping last ones */ |
c1e2e043 JK |
1654 | if (dump_type == DUMP_ALL) { |
1655 | dump_type = DUMP_LAST; | |
93302880 JK |
1656 | cb->args[IPSET_CB_DUMP] = dump_type | (dump_flags << 16); |
1657 | cb->args[IPSET_CB_INDEX] = 0; | |
c4c99783 JK |
1658 | if (set && set->variant->uref) |
1659 | set->variant->uref(set, cb, false); | |
a8a8a093 JK |
1660 | goto dump_last; |
1661 | } | |
a7b4f989 JK |
1662 | goto out; |
1663 | ||
1664 | nla_put_failure: | |
1665 | ret = -EFAULT; | |
c1e2e043 JK |
1666 | next_set: |
1667 | if (dump_type == DUMP_ONE) | |
93302880 | 1668 | cb->args[IPSET_CB_INDEX] = IPSET_INVALID_ID; |
c1e2e043 | 1669 | else |
93302880 | 1670 | cb->args[IPSET_CB_INDEX]++; |
a7b4f989 JK |
1671 | release_refcount: |
1672 | /* If there was an error or set is done, release set */ | |
93302880 | 1673 | if (ret || !cb->args[IPSET_CB_ARG0]) { |
8a02bdd5 | 1674 | set = ip_set_ref_netlink(inst, index); |
c4c99783 JK |
1675 | if (set->variant->uref) |
1676 | set->variant->uref(set, cb, false); | |
1677 | pr_debug("release set %s\n", set->name); | |
596cf3fe | 1678 | __ip_set_put_netlink(set); |
93302880 | 1679 | cb->args[IPSET_CB_ARG0] = 0; |
a7b4f989 | 1680 | } |
a7b4f989 JK |
1681 | out: |
1682 | if (nlh) { | |
1683 | nlmsg_end(skb, nlh); | |
1684 | pr_debug("nlmsg_len: %u\n", nlh->nlmsg_len); | |
1685 | dump_attrs(nlh); | |
1686 | } | |
1687 | ||
1688 | return ret < 0 ? ret : skb->len; | |
1689 | } | |
1690 | ||
7b8002a1 PNA |
1691 | static int ip_set_dump(struct net *net, struct sock *ctnl, struct sk_buff *skb, |
1692 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
1693 | const struct nlattr * const attr[], |
1694 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1695 | { |
23c42a40 | 1696 | if (unlikely(protocol_min_failed(attr))) |
a7b4f989 JK |
1697 | return -IPSET_ERR_PROTOCOL; |
1698 | ||
80d326fa PNA |
1699 | { |
1700 | struct netlink_dump_control c = { | |
50385171 KJ |
1701 | .start = ip_set_dump_start, |
1702 | .dump = ip_set_dump_do, | |
80d326fa PNA |
1703 | .done = ip_set_dump_done, |
1704 | }; | |
1705 | return netlink_dump_start(ctnl, skb, nlh, &c); | |
1706 | } | |
a7b4f989 JK |
1707 | } |
1708 | ||
1709 | /* Add, del and test */ | |
1710 | ||
1711 | static const struct nla_policy ip_set_adt_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1712 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1713 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
1714 | .len = IPSET_MAXNAMELEN - 1 }, | |
1715 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, | |
1716 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, | |
1717 | [IPSET_ATTR_ADT] = { .type = NLA_NESTED }, | |
1718 | }; | |
1719 | ||
1720 | static int | |
5f52bc3c | 1721 | call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set, |
a7b4f989 JK |
1722 | struct nlattr *tb[], enum ipset_adt adt, |
1723 | u32 flags, bool use_lineno) | |
1724 | { | |
3d14b171 | 1725 | int ret; |
a7b4f989 | 1726 | u32 lineno = 0; |
3d14b171 | 1727 | bool eexist = flags & IPSET_FLAG_EXIST, retried = false; |
a7b4f989 JK |
1728 | |
1729 | do { | |
f66ee041 | 1730 | ip_set_lock(set); |
3d14b171 | 1731 | ret = set->variant->uadt(set, tb, adt, &lineno, flags, retried); |
f66ee041 | 1732 | ip_set_unlock(set); |
3d14b171 | 1733 | retried = true; |
a7b4f989 JK |
1734 | } while (ret == -EAGAIN && |
1735 | set->variant->resize && | |
3d14b171 | 1736 | (ret = set->variant->resize(set, retried)) == 0); |
a7b4f989 JK |
1737 | |
1738 | if (!ret || (ret == -IPSET_ERR_EXIST && eexist)) | |
1739 | return 0; | |
1740 | if (lineno && use_lineno) { | |
1741 | /* Error in restore/batch mode: send back lineno */ | |
5f52bc3c JK |
1742 | struct nlmsghdr *rep, *nlh = nlmsg_hdr(skb); |
1743 | struct sk_buff *skb2; | |
1744 | struct nlmsgerr *errmsg; | |
73e64e18 JK |
1745 | size_t payload = min(SIZE_MAX, |
1746 | sizeof(*errmsg) + nlmsg_len(nlh)); | |
573ce260 | 1747 | int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); |
ca0f6a5c | 1748 | struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1]; |
5f52bc3c | 1749 | struct nlattr *cmdattr; |
a7b4f989 JK |
1750 | u32 *errline; |
1751 | ||
5f52bc3c | 1752 | skb2 = nlmsg_new(payload, GFP_KERNEL); |
ca0f6a5c | 1753 | if (!skb2) |
5f52bc3c | 1754 | return -ENOMEM; |
15e47304 | 1755 | rep = __nlmsg_put(skb2, NETLINK_CB(skb).portid, |
5f52bc3c JK |
1756 | nlh->nlmsg_seq, NLMSG_ERROR, payload, 0); |
1757 | errmsg = nlmsg_data(rep); | |
1758 | errmsg->error = ret; | |
1759 | memcpy(&errmsg->msg, nlh, nlh->nlmsg_len); | |
1760 | cmdattr = (void *)&errmsg->msg + min_len; | |
1761 | ||
12899756 JK |
1762 | ret = nla_parse(cda, IPSET_ATTR_CMD_MAX, cmdattr, |
1763 | nlh->nlmsg_len - min_len, ip_set_adt_policy, | |
1764 | NULL); | |
a7b4f989 | 1765 | |
f4f5748b AP |
1766 | if (ret) { |
1767 | nlmsg_free(skb2); | |
1768 | return ret; | |
1769 | } | |
a7b4f989 JK |
1770 | errline = nla_data(cda[IPSET_ATTR_LINENO]); |
1771 | ||
1772 | *errline = lineno; | |
5f52bc3c | 1773 | |
ca0f6a5c JK |
1774 | netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, |
1775 | MSG_DONTWAIT); | |
5f52bc3c JK |
1776 | /* Signal netlink not to send its ACK/errmsg. */ |
1777 | return -EINTR; | |
a7b4f989 JK |
1778 | } |
1779 | ||
1780 | return ret; | |
1781 | } | |
1782 | ||
f0cb8390 FF |
1783 | static int ip_set_ad(struct net *net, struct sock *ctnl, |
1784 | struct sk_buff *skb, | |
1785 | enum ipset_adt adt, | |
1786 | const struct nlmsghdr *nlh, | |
1787 | const struct nlattr * const attr[], | |
1788 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1789 | { |
7b8002a1 | 1790 | struct ip_set_net *inst = ip_set_pernet(net); |
a7b4f989 | 1791 | struct ip_set *set; |
ca0f6a5c | 1792 | struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; |
a7b4f989 JK |
1793 | const struct nlattr *nla; |
1794 | u32 flags = flag_exist(nlh); | |
1795 | bool use_lineno; | |
1796 | int ret = 0; | |
1797 | ||
23c42a40 | 1798 | if (unlikely(protocol_min_failed(attr) || |
ca0f6a5c | 1799 | !attr[IPSET_ATTR_SETNAME] || |
a7b4f989 JK |
1800 | !((attr[IPSET_ATTR_DATA] != NULL) ^ |
1801 | (attr[IPSET_ATTR_ADT] != NULL)) || | |
ca0f6a5c | 1802 | (attr[IPSET_ATTR_DATA] && |
a7b4f989 | 1803 | !flag_nested(attr[IPSET_ATTR_DATA])) || |
ca0f6a5c | 1804 | (attr[IPSET_ATTR_ADT] && |
a7b4f989 | 1805 | (!flag_nested(attr[IPSET_ATTR_ADT]) || |
ca0f6a5c | 1806 | !attr[IPSET_ATTR_LINENO])))) |
a7b4f989 JK |
1807 | return -IPSET_ERR_PROTOCOL; |
1808 | ||
1785e8f4 | 1809 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
ca0f6a5c | 1810 | if (!set) |
a7b4f989 JK |
1811 | return -ENOENT; |
1812 | ||
1813 | use_lineno = !!attr[IPSET_ATTR_LINENO]; | |
1814 | if (attr[IPSET_ATTR_DATA]) { | |
12899756 JK |
1815 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
1816 | attr[IPSET_ATTR_DATA], | |
1817 | set->type->adt_policy, NULL)) | |
a7b4f989 | 1818 | return -IPSET_ERR_PROTOCOL; |
f0cb8390 | 1819 | ret = call_ad(ctnl, skb, set, tb, adt, flags, |
5f52bc3c | 1820 | use_lineno); |
a7b4f989 JK |
1821 | } else { |
1822 | int nla_rem; | |
1823 | ||
1824 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { | |
a7b4f989 JK |
1825 | if (nla_type(nla) != IPSET_ATTR_DATA || |
1826 | !flag_nested(nla) || | |
12899756 JK |
1827 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
1828 | set->type->adt_policy, NULL)) | |
a7b4f989 | 1829 | return -IPSET_ERR_PROTOCOL; |
f0cb8390 | 1830 | ret = call_ad(ctnl, skb, set, tb, adt, |
a7b4f989 JK |
1831 | flags, use_lineno); |
1832 | if (ret < 0) | |
1833 | return ret; | |
1834 | } | |
1835 | } | |
1836 | return ret; | |
1837 | } | |
1838 | ||
f0cb8390 FF |
1839 | static int ip_set_uadd(struct net *net, struct sock *ctnl, |
1840 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1841 | const struct nlattr * const attr[], |
1842 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1843 | { |
f0cb8390 FF |
1844 | return ip_set_ad(net, ctnl, skb, |
1845 | IPSET_ADD, nlh, attr, extack); | |
1846 | } | |
a7b4f989 | 1847 | |
f0cb8390 FF |
1848 | static int ip_set_udel(struct net *net, struct sock *ctnl, |
1849 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
1850 | const struct nlattr * const attr[], | |
1851 | struct netlink_ext_ack *extack) | |
1852 | { | |
1853 | return ip_set_ad(net, ctnl, skb, | |
1854 | IPSET_DEL, nlh, attr, extack); | |
a7b4f989 JK |
1855 | } |
1856 | ||
7b8002a1 PNA |
1857 | static int ip_set_utest(struct net *net, struct sock *ctnl, struct sk_buff *skb, |
1858 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
1859 | const struct nlattr * const attr[], |
1860 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1861 | { |
7b8002a1 | 1862 | struct ip_set_net *inst = ip_set_pernet(net); |
a7b4f989 | 1863 | struct ip_set *set; |
ca0f6a5c | 1864 | struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; |
a7b4f989 | 1865 | int ret = 0; |
22dad713 | 1866 | u32 lineno; |
a7b4f989 | 1867 | |
23c42a40 | 1868 | if (unlikely(protocol_min_failed(attr) || |
ca0f6a5c JK |
1869 | !attr[IPSET_ATTR_SETNAME] || |
1870 | !attr[IPSET_ATTR_DATA] || | |
a7b4f989 JK |
1871 | !flag_nested(attr[IPSET_ATTR_DATA]))) |
1872 | return -IPSET_ERR_PROTOCOL; | |
1873 | ||
1785e8f4 | 1874 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
ca0f6a5c | 1875 | if (!set) |
a7b4f989 JK |
1876 | return -ENOENT; |
1877 | ||
12899756 JK |
1878 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA], |
1879 | set->type->adt_policy, NULL)) | |
a7b4f989 JK |
1880 | return -IPSET_ERR_PROTOCOL; |
1881 | ||
b57b2d1f | 1882 | rcu_read_lock_bh(); |
22dad713 | 1883 | ret = set->variant->uadt(set, tb, IPSET_TEST, &lineno, 0, 0); |
b57b2d1f | 1884 | rcu_read_unlock_bh(); |
a7b4f989 JK |
1885 | /* Userspace can't trigger element to be re-added */ |
1886 | if (ret == -EAGAIN) | |
1887 | ret = 1; | |
1888 | ||
0f1799ba | 1889 | return ret > 0 ? 0 : -IPSET_ERR_EXIST; |
a7b4f989 JK |
1890 | } |
1891 | ||
1892 | /* Get headed data of a set */ | |
1893 | ||
7b8002a1 PNA |
1894 | static int ip_set_header(struct net *net, struct sock *ctnl, |
1895 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1896 | const struct nlattr * const attr[], |
1897 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1898 | { |
7b8002a1 | 1899 | struct ip_set_net *inst = ip_set_pernet(net); |
a7b4f989 JK |
1900 | const struct ip_set *set; |
1901 | struct sk_buff *skb2; | |
1902 | struct nlmsghdr *nlh2; | |
a7b4f989 JK |
1903 | int ret = 0; |
1904 | ||
23c42a40 | 1905 | if (unlikely(protocol_min_failed(attr) || |
ca0f6a5c | 1906 | !attr[IPSET_ATTR_SETNAME])) |
a7b4f989 JK |
1907 | return -IPSET_ERR_PROTOCOL; |
1908 | ||
1785e8f4 | 1909 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
ca0f6a5c | 1910 | if (!set) |
a7b4f989 | 1911 | return -ENOENT; |
a7b4f989 JK |
1912 | |
1913 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
ca0f6a5c | 1914 | if (!skb2) |
a7b4f989 JK |
1915 | return -ENOMEM; |
1916 | ||
15e47304 | 1917 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
a7b4f989 JK |
1918 | IPSET_CMD_HEADER); |
1919 | if (!nlh2) | |
1920 | goto nlmsg_failure; | |
23c42a40 | 1921 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || |
7cf7899d DM |
1922 | nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name) || |
1923 | nla_put_string(skb2, IPSET_ATTR_TYPENAME, set->type->name) || | |
1924 | nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) || | |
1925 | nla_put_u8(skb2, IPSET_ATTR_REVISION, set->revision)) | |
1926 | goto nla_put_failure; | |
a7b4f989 JK |
1927 | nlmsg_end(skb2, nlh2); |
1928 | ||
15e47304 | 1929 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
a7b4f989 JK |
1930 | if (ret < 0) |
1931 | return ret; | |
1932 | ||
1933 | return 0; | |
1934 | ||
1935 | nla_put_failure: | |
1936 | nlmsg_cancel(skb2, nlh2); | |
1937 | nlmsg_failure: | |
1938 | kfree_skb(skb2); | |
1939 | return -EMSGSIZE; | |
1940 | } | |
1941 | ||
1942 | /* Get type data */ | |
1943 | ||
1944 | static const struct nla_policy ip_set_type_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1945 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1946 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, | |
1947 | .len = IPSET_MAXNAMELEN - 1 }, | |
1948 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, | |
1949 | }; | |
1950 | ||
7b8002a1 PNA |
1951 | static int ip_set_type(struct net *net, struct sock *ctnl, struct sk_buff *skb, |
1952 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
1953 | const struct nlattr * const attr[], |
1954 | struct netlink_ext_ack *extack) | |
a7b4f989 JK |
1955 | { |
1956 | struct sk_buff *skb2; | |
1957 | struct nlmsghdr *nlh2; | |
1958 | u8 family, min, max; | |
1959 | const char *typename; | |
1960 | int ret = 0; | |
1961 | ||
23c42a40 | 1962 | if (unlikely(protocol_min_failed(attr) || |
ca0f6a5c JK |
1963 | !attr[IPSET_ATTR_TYPENAME] || |
1964 | !attr[IPSET_ATTR_FAMILY])) | |
a7b4f989 JK |
1965 | return -IPSET_ERR_PROTOCOL; |
1966 | ||
1967 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); | |
1968 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); | |
1969 | ret = find_set_type_minmax(typename, family, &min, &max); | |
1970 | if (ret) | |
1971 | return ret; | |
1972 | ||
1973 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
ca0f6a5c | 1974 | if (!skb2) |
a7b4f989 JK |
1975 | return -ENOMEM; |
1976 | ||
15e47304 | 1977 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
a7b4f989 JK |
1978 | IPSET_CMD_TYPE); |
1979 | if (!nlh2) | |
1980 | goto nlmsg_failure; | |
23c42a40 | 1981 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || |
7cf7899d DM |
1982 | nla_put_string(skb2, IPSET_ATTR_TYPENAME, typename) || |
1983 | nla_put_u8(skb2, IPSET_ATTR_FAMILY, family) || | |
1984 | nla_put_u8(skb2, IPSET_ATTR_REVISION, max) || | |
1985 | nla_put_u8(skb2, IPSET_ATTR_REVISION_MIN, min)) | |
1986 | goto nla_put_failure; | |
a7b4f989 JK |
1987 | nlmsg_end(skb2, nlh2); |
1988 | ||
1989 | pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len); | |
15e47304 | 1990 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
a7b4f989 JK |
1991 | if (ret < 0) |
1992 | return ret; | |
1993 | ||
1994 | return 0; | |
1995 | ||
1996 | nla_put_failure: | |
1997 | nlmsg_cancel(skb2, nlh2); | |
1998 | nlmsg_failure: | |
1999 | kfree_skb(skb2); | |
2000 | return -EMSGSIZE; | |
2001 | } | |
2002 | ||
2003 | /* Get protocol version */ | |
2004 | ||
2005 | static const struct nla_policy | |
2006 | ip_set_protocol_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
2007 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
2008 | }; | |
2009 | ||
7b8002a1 PNA |
2010 | static int ip_set_protocol(struct net *net, struct sock *ctnl, |
2011 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
2012 | const struct nlattr * const attr[], |
2013 | struct netlink_ext_ack *extack) | |
a7b4f989 JK |
2014 | { |
2015 | struct sk_buff *skb2; | |
2016 | struct nlmsghdr *nlh2; | |
2017 | int ret = 0; | |
2018 | ||
ca0f6a5c | 2019 | if (unlikely(!attr[IPSET_ATTR_PROTOCOL])) |
a7b4f989 JK |
2020 | return -IPSET_ERR_PROTOCOL; |
2021 | ||
2022 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
ca0f6a5c | 2023 | if (!skb2) |
a7b4f989 JK |
2024 | return -ENOMEM; |
2025 | ||
15e47304 | 2026 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
a7b4f989 JK |
2027 | IPSET_CMD_PROTOCOL); |
2028 | if (!nlh2) | |
2029 | goto nlmsg_failure; | |
7cf7899d DM |
2030 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL)) |
2031 | goto nla_put_failure; | |
23c42a40 JK |
2032 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL_MIN, IPSET_PROTOCOL_MIN)) |
2033 | goto nla_put_failure; | |
2034 | nlmsg_end(skb2, nlh2); | |
2035 | ||
2036 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); | |
2037 | if (ret < 0) | |
2038 | return ret; | |
2039 | ||
2040 | return 0; | |
2041 | ||
2042 | nla_put_failure: | |
2043 | nlmsg_cancel(skb2, nlh2); | |
2044 | nlmsg_failure: | |
2045 | kfree_skb(skb2); | |
2046 | return -EMSGSIZE; | |
2047 | } | |
2048 | ||
2049 | /* Get set by name or index, from userspace */ | |
2050 | ||
2051 | static int ip_set_byname(struct net *net, struct sock *ctnl, | |
2052 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
2053 | const struct nlattr * const attr[], | |
2054 | struct netlink_ext_ack *extack) | |
2055 | { | |
2056 | struct ip_set_net *inst = ip_set_pernet(net); | |
2057 | struct sk_buff *skb2; | |
2058 | struct nlmsghdr *nlh2; | |
2059 | ip_set_id_t id = IPSET_INVALID_ID; | |
2060 | const struct ip_set *set; | |
2061 | int ret = 0; | |
2062 | ||
2063 | if (unlikely(protocol_failed(attr) || | |
2064 | !attr[IPSET_ATTR_SETNAME])) | |
2065 | return -IPSET_ERR_PROTOCOL; | |
2066 | ||
2067 | set = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), &id); | |
2068 | if (id == IPSET_INVALID_ID) | |
2069 | return -ENOENT; | |
2070 | ||
2071 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
2072 | if (!skb2) | |
2073 | return -ENOMEM; | |
2074 | ||
2075 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, | |
2076 | IPSET_CMD_GET_BYNAME); | |
2077 | if (!nlh2) | |
2078 | goto nlmsg_failure; | |
2079 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || | |
2080 | nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) || | |
2081 | nla_put_net16(skb2, IPSET_ATTR_INDEX, htons(id))) | |
2082 | goto nla_put_failure; | |
2083 | nlmsg_end(skb2, nlh2); | |
2084 | ||
2085 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); | |
2086 | if (ret < 0) | |
2087 | return ret; | |
2088 | ||
2089 | return 0; | |
2090 | ||
2091 | nla_put_failure: | |
2092 | nlmsg_cancel(skb2, nlh2); | |
2093 | nlmsg_failure: | |
2094 | kfree_skb(skb2); | |
2095 | return -EMSGSIZE; | |
2096 | } | |
2097 | ||
2098 | static const struct nla_policy ip_set_index_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
2099 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
2100 | [IPSET_ATTR_INDEX] = { .type = NLA_U16 }, | |
2101 | }; | |
2102 | ||
2103 | static int ip_set_byindex(struct net *net, struct sock *ctnl, | |
2104 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
2105 | const struct nlattr * const attr[], | |
2106 | struct netlink_ext_ack *extack) | |
2107 | { | |
2108 | struct ip_set_net *inst = ip_set_pernet(net); | |
2109 | struct sk_buff *skb2; | |
2110 | struct nlmsghdr *nlh2; | |
2111 | ip_set_id_t id = IPSET_INVALID_ID; | |
2112 | const struct ip_set *set; | |
2113 | int ret = 0; | |
2114 | ||
2115 | if (unlikely(protocol_failed(attr) || | |
2116 | !attr[IPSET_ATTR_INDEX])) | |
2117 | return -IPSET_ERR_PROTOCOL; | |
2118 | ||
2119 | id = ip_set_get_h16(attr[IPSET_ATTR_INDEX]); | |
2120 | if (id >= inst->ip_set_max) | |
2121 | return -ENOENT; | |
2122 | set = ip_set(inst, id); | |
2123 | if (set == NULL) | |
2124 | return -ENOENT; | |
2125 | ||
2126 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
2127 | if (!skb2) | |
2128 | return -ENOMEM; | |
2129 | ||
2130 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, | |
2131 | IPSET_CMD_GET_BYINDEX); | |
2132 | if (!nlh2) | |
2133 | goto nlmsg_failure; | |
2134 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || | |
8e350ce1 | 2135 | nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name)) |
23c42a40 | 2136 | goto nla_put_failure; |
a7b4f989 JK |
2137 | nlmsg_end(skb2, nlh2); |
2138 | ||
15e47304 | 2139 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
a7b4f989 JK |
2140 | if (ret < 0) |
2141 | return ret; | |
2142 | ||
2143 | return 0; | |
2144 | ||
2145 | nla_put_failure: | |
2146 | nlmsg_cancel(skb2, nlh2); | |
2147 | nlmsg_failure: | |
2148 | kfree_skb(skb2); | |
2149 | return -EMSGSIZE; | |
2150 | } | |
2151 | ||
2152 | static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = { | |
d31f4d44 TB |
2153 | [IPSET_CMD_NONE] = { |
2154 | .call = ip_set_none, | |
2155 | .attr_count = IPSET_ATTR_CMD_MAX, | |
2156 | }, | |
a7b4f989 JK |
2157 | [IPSET_CMD_CREATE] = { |
2158 | .call = ip_set_create, | |
2159 | .attr_count = IPSET_ATTR_CMD_MAX, | |
2160 | .policy = ip_set_create_policy, | |
2161 | }, | |
2162 | [IPSET_CMD_DESTROY] = { | |
2163 | .call = ip_set_destroy, | |
2164 | .attr_count = IPSET_ATTR_CMD_MAX, | |
2165 | .policy = ip_set_setname_policy, | |
2166 | }, | |
2167 | [IPSET_CMD_FLUSH] = { | |
2168 | .call = ip_set_flush, | |
2169 | .attr_count = IPSET_ATTR_CMD_MAX, | |
2170 | .policy = ip_set_setname_policy, | |
2171 | }, | |
2172 | [IPSET_CMD_RENAME] = { | |
2173 | .call = ip_set_rename, | |
2174 | .attr_count = IPSET_ATTR_CMD_MAX, | |
2175 | .policy = ip_set_setname2_policy, | |
2176 | }, | |
2177 | [IPSET_CMD_SWAP] = { | |
2178 | .call = ip_set_swap, | |
2179 | .attr_count = IPSET_ATTR_CMD_MAX, | |
2180 | .policy = ip_set_setname2_policy, | |
2181 | }, | |
2182 | [IPSET_CMD_LIST] = { | |
2183 | .call = ip_set_dump, | |
2184 | .attr_count = IPSET_ATTR_CMD_MAX, | |
12899756 | 2185 | .policy = ip_set_dump_policy, |
a7b4f989 JK |
2186 | }, |
2187 | [IPSET_CMD_SAVE] = { | |
2188 | .call = ip_set_dump, | |
2189 | .attr_count = IPSET_ATTR_CMD_MAX, | |
2190 | .policy = ip_set_setname_policy, | |
2191 | }, | |
2192 | [IPSET_CMD_ADD] = { | |
2193 | .call = ip_set_uadd, | |
2194 | .attr_count = IPSET_ATTR_CMD_MAX, | |
2195 | .policy = ip_set_adt_policy, | |
2196 | }, | |
2197 | [IPSET_CMD_DEL] = { | |
2198 | .call = ip_set_udel, | |
2199 | .attr_count = IPSET_ATTR_CMD_MAX, | |
2200 | .policy = ip_set_adt_policy, | |
2201 | }, | |
2202 | [IPSET_CMD_TEST] = { | |
2203 | .call = ip_set_utest, | |
2204 | .attr_count = IPSET_ATTR_CMD_MAX, | |
2205 | .policy = ip_set_adt_policy, | |
2206 | }, | |
2207 | [IPSET_CMD_HEADER] = { | |
2208 | .call = ip_set_header, | |
2209 | .attr_count = IPSET_ATTR_CMD_MAX, | |
2210 | .policy = ip_set_setname_policy, | |
2211 | }, | |
2212 | [IPSET_CMD_TYPE] = { | |
2213 | .call = ip_set_type, | |
2214 | .attr_count = IPSET_ATTR_CMD_MAX, | |
2215 | .policy = ip_set_type_policy, | |
2216 | }, | |
2217 | [IPSET_CMD_PROTOCOL] = { | |
2218 | .call = ip_set_protocol, | |
2219 | .attr_count = IPSET_ATTR_CMD_MAX, | |
2220 | .policy = ip_set_protocol_policy, | |
2221 | }, | |
23c42a40 JK |
2222 | [IPSET_CMD_GET_BYNAME] = { |
2223 | .call = ip_set_byname, | |
2224 | .attr_count = IPSET_ATTR_CMD_MAX, | |
2225 | .policy = ip_set_setname_policy, | |
2226 | }, | |
2227 | [IPSET_CMD_GET_BYINDEX] = { | |
2228 | .call = ip_set_byindex, | |
2229 | .attr_count = IPSET_ATTR_CMD_MAX, | |
2230 | .policy = ip_set_index_policy, | |
2231 | }, | |
a7b4f989 JK |
2232 | }; |
2233 | ||
2234 | static struct nfnetlink_subsystem ip_set_netlink_subsys __read_mostly = { | |
2235 | .name = "ip_set", | |
2236 | .subsys_id = NFNL_SUBSYS_IPSET, | |
2237 | .cb_count = IPSET_MSG_MAX, | |
2238 | .cb = ip_set_netlink_subsys_cb, | |
2239 | }; | |
2240 | ||
2241 | /* Interface to iptables/ip6tables */ | |
2242 | ||
2243 | static int | |
2244 | ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len) | |
2245 | { | |
95c96174 | 2246 | unsigned int *op; |
a7b4f989 JK |
2247 | void *data; |
2248 | int copylen = *len, ret = 0; | |
1785e8f4 VL |
2249 | struct net *net = sock_net(sk); |
2250 | struct ip_set_net *inst = ip_set_pernet(net); | |
a7b4f989 | 2251 | |
1785e8f4 | 2252 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
a7b4f989 JK |
2253 | return -EPERM; |
2254 | if (optval != SO_IP_SET) | |
2255 | return -EBADF; | |
95c96174 | 2256 | if (*len < sizeof(unsigned int)) |
a7b4f989 JK |
2257 | return -EINVAL; |
2258 | ||
2259 | data = vmalloc(*len); | |
2260 | if (!data) | |
2261 | return -ENOMEM; | |
2262 | if (copy_from_user(data, user, *len) != 0) { | |
2263 | ret = -EFAULT; | |
2264 | goto done; | |
2265 | } | |
68ad546a | 2266 | op = data; |
a7b4f989 JK |
2267 | |
2268 | if (*op < IP_SET_OP_VERSION) { | |
2269 | /* Check the version at the beginning of operations */ | |
2270 | struct ip_set_req_version *req_version = data; | |
2196937e DC |
2271 | |
2272 | if (*len < sizeof(struct ip_set_req_version)) { | |
2273 | ret = -EINVAL; | |
2274 | goto done; | |
2275 | } | |
2276 | ||
23c42a40 | 2277 | if (req_version->version < IPSET_PROTOCOL_MIN) { |
a7b4f989 JK |
2278 | ret = -EPROTO; |
2279 | goto done; | |
2280 | } | |
2281 | } | |
2282 | ||
2283 | switch (*op) { | |
2284 | case IP_SET_OP_VERSION: { | |
2285 | struct ip_set_req_version *req_version = data; | |
2286 | ||
2287 | if (*len != sizeof(struct ip_set_req_version)) { | |
2288 | ret = -EINVAL; | |
2289 | goto done; | |
2290 | } | |
2291 | ||
2292 | req_version->version = IPSET_PROTOCOL; | |
30b7244d DC |
2293 | if (copy_to_user(user, req_version, |
2294 | sizeof(struct ip_set_req_version))) | |
2295 | ret = -EFAULT; | |
a7b4f989 JK |
2296 | goto done; |
2297 | } | |
2298 | case IP_SET_OP_GET_BYNAME: { | |
2299 | struct ip_set_req_get_set *req_get = data; | |
9076aea7 | 2300 | ip_set_id_t id; |
a7b4f989 JK |
2301 | |
2302 | if (*len != sizeof(struct ip_set_req_get_set)) { | |
2303 | ret = -EINVAL; | |
2304 | goto done; | |
2305 | } | |
2306 | req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; | |
c14b78e7 | 2307 | nfnl_lock(NFNL_SUBSYS_IPSET); |
1785e8f4 | 2308 | find_set_and_id(inst, req_get->set.name, &id); |
9076aea7 | 2309 | req_get->set.index = id; |
c14b78e7 | 2310 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
2311 | goto copy; |
2312 | } | |
5e04c0c3 JK |
2313 | case IP_SET_OP_GET_FNAME: { |
2314 | struct ip_set_req_get_set_family *req_get = data; | |
2315 | ip_set_id_t id; | |
2316 | ||
2317 | if (*len != sizeof(struct ip_set_req_get_set_family)) { | |
2318 | ret = -EINVAL; | |
2319 | goto done; | |
2320 | } | |
2321 | req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; | |
2322 | nfnl_lock(NFNL_SUBSYS_IPSET); | |
1785e8f4 | 2323 | find_set_and_id(inst, req_get->set.name, &id); |
5e04c0c3 JK |
2324 | req_get->set.index = id; |
2325 | if (id != IPSET_INVALID_ID) | |
3e90ebd3 | 2326 | req_get->family = ip_set(inst, id)->family; |
5e04c0c3 JK |
2327 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
2328 | goto copy; | |
2329 | } | |
a7b4f989 JK |
2330 | case IP_SET_OP_GET_BYINDEX: { |
2331 | struct ip_set_req_get_set *req_get = data; | |
9076aea7 | 2332 | struct ip_set *set; |
a7b4f989 JK |
2333 | |
2334 | if (*len != sizeof(struct ip_set_req_get_set) || | |
1785e8f4 | 2335 | req_get->set.index >= inst->ip_set_max) { |
a7b4f989 JK |
2336 | ret = -EINVAL; |
2337 | goto done; | |
2338 | } | |
c14b78e7 | 2339 | nfnl_lock(NFNL_SUBSYS_IPSET); |
3e90ebd3 | 2340 | set = ip_set(inst, req_get->set.index); |
00ec3ab0 QC |
2341 | ret = strscpy(req_get->set.name, set ? set->name : "", |
2342 | IPSET_MAXNAMELEN); | |
c14b78e7 | 2343 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
00ec3ab0 QC |
2344 | if (ret < 0) |
2345 | goto done; | |
a7b4f989 JK |
2346 | goto copy; |
2347 | } | |
2348 | default: | |
2349 | ret = -EBADMSG; | |
2350 | goto done; | |
2351 | } /* end of switch(op) */ | |
2352 | ||
2353 | copy: | |
30b7244d DC |
2354 | if (copy_to_user(user, data, copylen)) |
2355 | ret = -EFAULT; | |
a7b4f989 JK |
2356 | |
2357 | done: | |
2358 | vfree(data); | |
2359 | if (ret > 0) | |
2360 | ret = 0; | |
2361 | return ret; | |
2362 | } | |
2363 | ||
2364 | static struct nf_sockopt_ops so_set __read_mostly = { | |
2365 | .pf = PF_INET, | |
2366 | .get_optmin = SO_IP_SET, | |
2367 | .get_optmax = SO_IP_SET + 1, | |
d4ef3835 | 2368 | .get = ip_set_sockfn_get, |
a7b4f989 JK |
2369 | .owner = THIS_MODULE, |
2370 | }; | |
2371 | ||
1785e8f4 VL |
2372 | static int __net_init |
2373 | ip_set_net_init(struct net *net) | |
a7b4f989 | 2374 | { |
1785e8f4 | 2375 | struct ip_set_net *inst = ip_set_pernet(net); |
9076aea7 | 2376 | struct ip_set **list; |
a7b4f989 | 2377 | |
1785e8f4 VL |
2378 | inst->ip_set_max = max_sets ? max_sets : CONFIG_IP_SET_MAX; |
2379 | if (inst->ip_set_max >= IPSET_INVALID_ID) | |
2380 | inst->ip_set_max = IPSET_INVALID_ID - 1; | |
a7b4f989 | 2381 | |
ed956f39 | 2382 | list = kvcalloc(inst->ip_set_max, sizeof(struct ip_set *), GFP_KERNEL); |
9076aea7 | 2383 | if (!list) |
a7b4f989 | 2384 | return -ENOMEM; |
9c1ba5c8 JK |
2385 | inst->is_deleted = false; |
2386 | inst->is_destroyed = false; | |
1785e8f4 | 2387 | rcu_assign_pointer(inst->ip_set_list, list); |
1785e8f4 VL |
2388 | return 0; |
2389 | } | |
2390 | ||
2391 | static void __net_exit | |
2392 | ip_set_net_exit(struct net *net) | |
2393 | { | |
2394 | struct ip_set_net *inst = ip_set_pernet(net); | |
2395 | ||
2396 | struct ip_set *set = NULL; | |
2397 | ip_set_id_t i; | |
2398 | ||
9c1ba5c8 | 2399 | inst->is_deleted = true; /* flag for ip_set_nfnl_put */ |
1785e8f4 | 2400 | |
f998b6b1 | 2401 | nfnl_lock(NFNL_SUBSYS_IPSET); |
1785e8f4 | 2402 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 2403 | set = ip_set(inst, i); |
9c1ba5c8 JK |
2404 | if (set) { |
2405 | ip_set(inst, i) = NULL; | |
2406 | ip_set_destroy_set(set); | |
2407 | } | |
1785e8f4 | 2408 | } |
f998b6b1 | 2409 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
ed956f39 | 2410 | kvfree(rcu_dereference_protected(inst->ip_set_list, 1)); |
1785e8f4 VL |
2411 | } |
2412 | ||
2413 | static struct pernet_operations ip_set_net_ops = { | |
2414 | .init = ip_set_net_init, | |
2415 | .exit = ip_set_net_exit, | |
2416 | .id = &ip_set_net_id, | |
a5a179b6 | 2417 | .size = sizeof(struct ip_set_net), |
1785e8f4 VL |
2418 | }; |
2419 | ||
1785e8f4 VL |
2420 | static int __init |
2421 | ip_set_init(void) | |
2422 | { | |
e23ed762 | 2423 | int ret = register_pernet_subsys(&ip_set_net_ops); |
ca0f6a5c | 2424 | |
e23ed762 FW |
2425 | if (ret) { |
2426 | pr_err("ip_set: cannot register pernet_subsys.\n"); | |
2427 | return ret; | |
2428 | } | |
2429 | ||
2430 | ret = nfnetlink_subsys_register(&ip_set_netlink_subsys); | |
a7b4f989 JK |
2431 | if (ret != 0) { |
2432 | pr_err("ip_set: cannot register with nfnetlink.\n"); | |
e23ed762 | 2433 | unregister_pernet_subsys(&ip_set_net_ops); |
a7b4f989 JK |
2434 | return ret; |
2435 | } | |
e23ed762 | 2436 | |
a7b4f989 JK |
2437 | ret = nf_register_sockopt(&so_set); |
2438 | if (ret != 0) { | |
2439 | pr_err("SO_SET registry failed: %d\n", ret); | |
2440 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); | |
e23ed762 | 2441 | unregister_pernet_subsys(&ip_set_net_ops); |
a7b4f989 JK |
2442 | return ret; |
2443 | } | |
e23ed762 | 2444 | |
a7b4f989 JK |
2445 | return 0; |
2446 | } | |
2447 | ||
2448 | static void __exit | |
2449 | ip_set_fini(void) | |
2450 | { | |
a7b4f989 JK |
2451 | nf_unregister_sockopt(&so_set); |
2452 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); | |
e23ed762 FW |
2453 | |
2454 | unregister_pernet_subsys(&ip_set_net_ops); | |
a7b4f989 JK |
2455 | pr_debug("these are the famous last words\n"); |
2456 | } | |
2457 | ||
2458 | module_init(ip_set_init); | |
2459 | module_exit(ip_set_fini); | |
e5531166 PNA |
2460 | |
2461 | MODULE_DESCRIPTION("ip_set: protocol " __stringify(IPSET_PROTOCOL)); |