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a7b4f989 JK |
1 | /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu> |
2 | * Patrick Schaaf <bof@bof.de> | |
075e64c0 | 3 | * Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
a7b4f989 JK |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | /* Kernel module for IP set management */ | |
11 | ||
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/moduleparam.h> | |
15 | #include <linux/ip.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/spinlock.h> | |
a7b4f989 | 18 | #include <linux/rculist.h> |
a7b4f989 | 19 | #include <net/netlink.h> |
1785e8f4 VL |
20 | #include <net/net_namespace.h> |
21 | #include <net/netns/generic.h> | |
a7b4f989 JK |
22 | |
23 | #include <linux/netfilter.h> | |
b66554cf | 24 | #include <linux/netfilter/x_tables.h> |
a7b4f989 JK |
25 | #include <linux/netfilter/nfnetlink.h> |
26 | #include <linux/netfilter/ipset/ip_set.h> | |
27 | ||
28 | static LIST_HEAD(ip_set_type_list); /* all registered set types */ | |
29 | static DEFINE_MUTEX(ip_set_type_mutex); /* protects ip_set_type_list */ | |
2f9f28b2 | 30 | static DEFINE_RWLOCK(ip_set_ref_lock); /* protects the set refs */ |
a7b4f989 | 31 | |
1785e8f4 VL |
32 | struct ip_set_net { |
33 | struct ip_set * __rcu *ip_set_list; /* all individual sets */ | |
34 | ip_set_id_t ip_set_max; /* max number of sets */ | |
9c1ba5c8 JK |
35 | bool is_deleted; /* deleted by ip_set_net_exit */ |
36 | bool is_destroyed; /* all sets are destroyed */ | |
1785e8f4 | 37 | }; |
ca0f6a5c | 38 | |
c7d03a00 | 39 | static unsigned int ip_set_net_id __read_mostly; |
1785e8f4 VL |
40 | |
41 | static inline struct ip_set_net *ip_set_pernet(struct net *net) | |
42 | { | |
43 | return net_generic(net, ip_set_net_id); | |
44 | } | |
a7b4f989 | 45 | |
9076aea7 | 46 | #define IP_SET_INC 64 |
22496f09 | 47 | #define STRNCMP(a, b) (strncmp(a, b, IPSET_MAXNAMELEN) == 0) |
a7b4f989 JK |
48 | |
49 | static unsigned int max_sets; | |
50 | ||
51 | module_param(max_sets, int, 0600); | |
52 | MODULE_PARM_DESC(max_sets, "maximal number of sets"); | |
53 | MODULE_LICENSE("GPL"); | |
54 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); | |
55 | MODULE_DESCRIPTION("core IP set support"); | |
56 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_IPSET); | |
57 | ||
9076aea7 | 58 | /* When the nfnl mutex is held: */ |
3e90ebd3 | 59 | #define ip_set_dereference(p) \ |
49971b88 | 60 | rcu_dereference_protected(p, lockdep_nfnl_is_held(NFNL_SUBSYS_IPSET)) |
3e90ebd3 PM |
61 | #define ip_set(inst, id) \ |
62 | ip_set_dereference((inst)->ip_set_list)[id] | |
9076aea7 | 63 | |
ca0f6a5c | 64 | /* The set types are implemented in modules and registered set types |
a7b4f989 JK |
65 | * can be found in ip_set_type_list. Adding/deleting types is |
66 | * serialized by ip_set_type_mutex. | |
67 | */ | |
68 | ||
69 | static inline void | |
70 | ip_set_type_lock(void) | |
71 | { | |
72 | mutex_lock(&ip_set_type_mutex); | |
73 | } | |
74 | ||
75 | static inline void | |
76 | ip_set_type_unlock(void) | |
77 | { | |
78 | mutex_unlock(&ip_set_type_mutex); | |
79 | } | |
80 | ||
81 | /* Register and deregister settype */ | |
82 | ||
83 | static struct ip_set_type * | |
84 | find_set_type(const char *name, u8 family, u8 revision) | |
85 | { | |
86 | struct ip_set_type *type; | |
87 | ||
88 | list_for_each_entry_rcu(type, &ip_set_type_list, list) | |
22496f09 | 89 | if (STRNCMP(type->name, name) && |
3ace95c0 JK |
90 | (type->family == family || |
91 | type->family == NFPROTO_UNSPEC) && | |
f1e00b39 JK |
92 | revision >= type->revision_min && |
93 | revision <= type->revision_max) | |
a7b4f989 JK |
94 | return type; |
95 | return NULL; | |
96 | } | |
97 | ||
98 | /* Unlock, try to load a set type module and lock again */ | |
088067f4 JK |
99 | static bool |
100 | load_settype(const char *name) | |
a7b4f989 | 101 | { |
c14b78e7 | 102 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
103 | pr_debug("try to load ip_set_%s\n", name); |
104 | if (request_module("ip_set_%s", name) < 0) { | |
b167a37c | 105 | pr_warn("Can't find ip_set type %s\n", name); |
c14b78e7 | 106 | nfnl_lock(NFNL_SUBSYS_IPSET); |
088067f4 | 107 | return false; |
a7b4f989 | 108 | } |
c14b78e7 | 109 | nfnl_lock(NFNL_SUBSYS_IPSET); |
088067f4 | 110 | return true; |
a7b4f989 JK |
111 | } |
112 | ||
113 | /* Find a set type and reference it */ | |
088067f4 JK |
114 | #define find_set_type_get(name, family, revision, found) \ |
115 | __find_set_type_get(name, family, revision, found, false) | |
116 | ||
a7b4f989 | 117 | static int |
088067f4 JK |
118 | __find_set_type_get(const char *name, u8 family, u8 revision, |
119 | struct ip_set_type **found, bool retry) | |
a7b4f989 | 120 | { |
5c1aba46 JK |
121 | struct ip_set_type *type; |
122 | int err; | |
123 | ||
088067f4 JK |
124 | if (retry && !load_settype(name)) |
125 | return -IPSET_ERR_FIND_TYPE; | |
126 | ||
a7b4f989 JK |
127 | rcu_read_lock(); |
128 | *found = find_set_type(name, family, revision); | |
129 | if (*found) { | |
5c1aba46 JK |
130 | err = !try_module_get((*found)->me) ? -EFAULT : 0; |
131 | goto unlock; | |
a7b4f989 | 132 | } |
088067f4 | 133 | /* Make sure the type is already loaded |
ca0f6a5c JK |
134 | * but we don't support the revision |
135 | */ | |
5c1aba46 | 136 | list_for_each_entry_rcu(type, &ip_set_type_list, list) |
22496f09 | 137 | if (STRNCMP(type->name, name)) { |
5c1aba46 JK |
138 | err = -IPSET_ERR_FIND_TYPE; |
139 | goto unlock; | |
140 | } | |
a7b4f989 JK |
141 | rcu_read_unlock(); |
142 | ||
088067f4 JK |
143 | return retry ? -IPSET_ERR_FIND_TYPE : |
144 | __find_set_type_get(name, family, revision, found, true); | |
5c1aba46 JK |
145 | |
146 | unlock: | |
147 | rcu_read_unlock(); | |
148 | return err; | |
a7b4f989 JK |
149 | } |
150 | ||
151 | /* Find a given set type by name and family. | |
152 | * If we succeeded, the supported minimal and maximum revisions are | |
153 | * filled out. | |
154 | */ | |
088067f4 JK |
155 | #define find_set_type_minmax(name, family, min, max) \ |
156 | __find_set_type_minmax(name, family, min, max, false) | |
157 | ||
a7b4f989 | 158 | static int |
088067f4 JK |
159 | __find_set_type_minmax(const char *name, u8 family, u8 *min, u8 *max, |
160 | bool retry) | |
a7b4f989 JK |
161 | { |
162 | struct ip_set_type *type; | |
163 | bool found = false; | |
164 | ||
088067f4 JK |
165 | if (retry && !load_settype(name)) |
166 | return -IPSET_ERR_FIND_TYPE; | |
167 | ||
5c1aba46 | 168 | *min = 255; *max = 0; |
a7b4f989 JK |
169 | rcu_read_lock(); |
170 | list_for_each_entry_rcu(type, &ip_set_type_list, list) | |
22496f09 | 171 | if (STRNCMP(type->name, name) && |
3ace95c0 JK |
172 | (type->family == family || |
173 | type->family == NFPROTO_UNSPEC)) { | |
a7b4f989 | 174 | found = true; |
f1e00b39 JK |
175 | if (type->revision_min < *min) |
176 | *min = type->revision_min; | |
177 | if (type->revision_max > *max) | |
178 | *max = type->revision_max; | |
a7b4f989 JK |
179 | } |
180 | rcu_read_unlock(); | |
181 | if (found) | |
182 | return 0; | |
183 | ||
088067f4 JK |
184 | return retry ? -IPSET_ERR_FIND_TYPE : |
185 | __find_set_type_minmax(name, family, min, max, true); | |
a7b4f989 JK |
186 | } |
187 | ||
c15f1c83 JE |
188 | #define family_name(f) ((f) == NFPROTO_IPV4 ? "inet" : \ |
189 | (f) == NFPROTO_IPV6 ? "inet6" : "any") | |
a7b4f989 JK |
190 | |
191 | /* Register a set type structure. The type is identified by | |
192 | * the unique triple of name, family and revision. | |
193 | */ | |
194 | int | |
195 | ip_set_type_register(struct ip_set_type *type) | |
196 | { | |
197 | int ret = 0; | |
198 | ||
199 | if (type->protocol != IPSET_PROTOCOL) { | |
b167a37c JP |
200 | pr_warn("ip_set type %s, family %s, revision %u:%u uses wrong protocol version %u (want %u)\n", |
201 | type->name, family_name(type->family), | |
202 | type->revision_min, type->revision_max, | |
203 | type->protocol, IPSET_PROTOCOL); | |
a7b4f989 JK |
204 | return -EINVAL; |
205 | } | |
206 | ||
207 | ip_set_type_lock(); | |
f1e00b39 | 208 | if (find_set_type(type->name, type->family, type->revision_min)) { |
a7b4f989 | 209 | /* Duplicate! */ |
b167a37c JP |
210 | pr_warn("ip_set type %s, family %s with revision min %u already registered!\n", |
211 | type->name, family_name(type->family), | |
212 | type->revision_min); | |
b57b2d1f JK |
213 | ip_set_type_unlock(); |
214 | return -EINVAL; | |
a7b4f989 JK |
215 | } |
216 | list_add_rcu(&type->list, &ip_set_type_list); | |
f1e00b39 JK |
217 | pr_debug("type %s, family %s, revision %u:%u registered.\n", |
218 | type->name, family_name(type->family), | |
219 | type->revision_min, type->revision_max); | |
a7b4f989 | 220 | ip_set_type_unlock(); |
b57b2d1f | 221 | |
a7b4f989 JK |
222 | return ret; |
223 | } | |
224 | EXPORT_SYMBOL_GPL(ip_set_type_register); | |
225 | ||
226 | /* Unregister a set type. There's a small race with ip_set_create */ | |
227 | void | |
228 | ip_set_type_unregister(struct ip_set_type *type) | |
229 | { | |
230 | ip_set_type_lock(); | |
f1e00b39 | 231 | if (!find_set_type(type->name, type->family, type->revision_min)) { |
b167a37c JP |
232 | pr_warn("ip_set type %s, family %s with revision min %u not registered\n", |
233 | type->name, family_name(type->family), | |
234 | type->revision_min); | |
b57b2d1f JK |
235 | ip_set_type_unlock(); |
236 | return; | |
a7b4f989 JK |
237 | } |
238 | list_del_rcu(&type->list); | |
f1e00b39 JK |
239 | pr_debug("type %s, family %s with revision min %u unregistered.\n", |
240 | type->name, family_name(type->family), type->revision_min); | |
a7b4f989 JK |
241 | ip_set_type_unlock(); |
242 | ||
243 | synchronize_rcu(); | |
244 | } | |
245 | EXPORT_SYMBOL_GPL(ip_set_type_unregister); | |
246 | ||
247 | /* Utility functions */ | |
248 | void * | |
249 | ip_set_alloc(size_t size) | |
250 | { | |
251 | void *members = NULL; | |
252 | ||
253 | if (size < KMALLOC_MAX_SIZE) | |
254 | members = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); | |
255 | ||
256 | if (members) { | |
257 | pr_debug("%p: allocated with kmalloc\n", members); | |
258 | return members; | |
259 | } | |
260 | ||
261 | members = vzalloc(size); | |
262 | if (!members) | |
263 | return NULL; | |
264 | pr_debug("%p: allocated with vmalloc\n", members); | |
265 | ||
266 | return members; | |
267 | } | |
268 | EXPORT_SYMBOL_GPL(ip_set_alloc); | |
269 | ||
270 | void | |
271 | ip_set_free(void *members) | |
272 | { | |
273 | pr_debug("%p: free with %s\n", members, | |
274 | is_vmalloc_addr(members) ? "vfree" : "kfree"); | |
4cb28970 | 275 | kvfree(members); |
a7b4f989 JK |
276 | } |
277 | EXPORT_SYMBOL_GPL(ip_set_free); | |
278 | ||
279 | static inline bool | |
280 | flag_nested(const struct nlattr *nla) | |
281 | { | |
282 | return nla->nla_type & NLA_F_NESTED; | |
283 | } | |
284 | ||
285 | static const struct nla_policy ipaddr_policy[IPSET_ATTR_IPADDR_MAX + 1] = { | |
286 | [IPSET_ATTR_IPADDR_IPV4] = { .type = NLA_U32 }, | |
287 | [IPSET_ATTR_IPADDR_IPV6] = { .type = NLA_BINARY, | |
288 | .len = sizeof(struct in6_addr) }, | |
289 | }; | |
290 | ||
291 | int | |
292 | ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr) | |
293 | { | |
ca0f6a5c | 294 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX + 1]; |
a7b4f989 JK |
295 | |
296 | if (unlikely(!flag_nested(nla))) | |
297 | return -IPSET_ERR_PROTOCOL; | |
fceb6435 JB |
298 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, |
299 | ipaddr_policy, NULL)) | |
a7b4f989 JK |
300 | return -IPSET_ERR_PROTOCOL; |
301 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV4))) | |
302 | return -IPSET_ERR_PROTOCOL; | |
303 | ||
304 | *ipaddr = nla_get_be32(tb[IPSET_ATTR_IPADDR_IPV4]); | |
305 | return 0; | |
306 | } | |
307 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr4); | |
308 | ||
309 | int | |
310 | ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr) | |
311 | { | |
ca0f6a5c | 312 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX + 1]; |
a7b4f989 JK |
313 | |
314 | if (unlikely(!flag_nested(nla))) | |
315 | return -IPSET_ERR_PROTOCOL; | |
316 | ||
fceb6435 JB |
317 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, |
318 | ipaddr_policy, NULL)) | |
a7b4f989 JK |
319 | return -IPSET_ERR_PROTOCOL; |
320 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV6))) | |
321 | return -IPSET_ERR_PROTOCOL; | |
322 | ||
323 | memcpy(ipaddr, nla_data(tb[IPSET_ATTR_IPADDR_IPV6]), | |
ca0f6a5c | 324 | sizeof(struct in6_addr)); |
a7b4f989 JK |
325 | return 0; |
326 | } | |
327 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr6); | |
328 | ||
9e41f26a | 329 | typedef void (*destroyer)(struct ip_set *, void *); |
03c8b234 JK |
330 | /* ipset data extension types, in size order */ |
331 | ||
332 | const struct ip_set_ext_type ip_set_extensions[] = { | |
333 | [IPSET_EXT_ID_COUNTER] = { | |
334 | .type = IPSET_EXT_COUNTER, | |
335 | .flag = IPSET_FLAG_WITH_COUNTERS, | |
336 | .len = sizeof(struct ip_set_counter), | |
337 | .align = __alignof__(struct ip_set_counter), | |
338 | }, | |
339 | [IPSET_EXT_ID_TIMEOUT] = { | |
340 | .type = IPSET_EXT_TIMEOUT, | |
341 | .len = sizeof(unsigned long), | |
342 | .align = __alignof__(unsigned long), | |
343 | }, | |
0e9871e3 AD |
344 | [IPSET_EXT_ID_SKBINFO] = { |
345 | .type = IPSET_EXT_SKBINFO, | |
346 | .flag = IPSET_FLAG_WITH_SKBINFO, | |
347 | .len = sizeof(struct ip_set_skbinfo), | |
348 | .align = __alignof__(struct ip_set_skbinfo), | |
349 | }, | |
68b63f08 OS |
350 | [IPSET_EXT_ID_COMMENT] = { |
351 | .type = IPSET_EXT_COMMENT | IPSET_EXT_DESTROY, | |
352 | .flag = IPSET_FLAG_WITH_COMMENT, | |
353 | .len = sizeof(struct ip_set_comment), | |
354 | .align = __alignof__(struct ip_set_comment), | |
355 | .destroy = (destroyer) ip_set_comment_free, | |
356 | }, | |
03c8b234 JK |
357 | }; |
358 | EXPORT_SYMBOL_GPL(ip_set_extensions); | |
359 | ||
360 | static inline bool | |
361 | add_extension(enum ip_set_ext_id id, u32 flags, struct nlattr *tb[]) | |
362 | { | |
363 | return ip_set_extensions[id].flag ? | |
364 | (flags & ip_set_extensions[id].flag) : | |
365 | !!tb[IPSET_ATTR_TIMEOUT]; | |
366 | } | |
367 | ||
368 | size_t | |
95ad1f4a JK |
369 | ip_set_elem_len(struct ip_set *set, struct nlattr *tb[], size_t len, |
370 | size_t align) | |
03c8b234 JK |
371 | { |
372 | enum ip_set_ext_id id; | |
03c8b234 JK |
373 | u32 cadt_flags = 0; |
374 | ||
375 | if (tb[IPSET_ATTR_CADT_FLAGS]) | |
376 | cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); | |
07cf8f5a JH |
377 | if (cadt_flags & IPSET_FLAG_WITH_FORCEADD) |
378 | set->flags |= IPSET_CREATE_FLAG_FORCEADD; | |
95ad1f4a JK |
379 | if (!align) |
380 | align = 1; | |
03c8b234 JK |
381 | for (id = 0; id < IPSET_EXT_ID_MAX; id++) { |
382 | if (!add_extension(id, cadt_flags, tb)) | |
383 | continue; | |
95ad1f4a JK |
384 | len = ALIGN(len, ip_set_extensions[id].align); |
385 | set->offset[id] = len; | |
03c8b234 | 386 | set->extensions |= ip_set_extensions[id].type; |
95ad1f4a | 387 | len += ip_set_extensions[id].len; |
03c8b234 | 388 | } |
95ad1f4a | 389 | return ALIGN(len, align); |
03c8b234 JK |
390 | } |
391 | EXPORT_SYMBOL_GPL(ip_set_elem_len); | |
392 | ||
075e64c0 JK |
393 | int |
394 | ip_set_get_extensions(struct ip_set *set, struct nlattr *tb[], | |
395 | struct ip_set_ext *ext) | |
396 | { | |
0e9871e3 | 397 | u64 fullmark; |
7dd37bc8 SP |
398 | |
399 | if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || | |
400 | !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || | |
401 | !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) || | |
402 | !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) || | |
403 | !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) || | |
404 | !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE))) | |
405 | return -IPSET_ERR_PROTOCOL; | |
406 | ||
075e64c0 | 407 | if (tb[IPSET_ATTR_TIMEOUT]) { |
edda0791 | 408 | if (!SET_WITH_TIMEOUT(set)) |
075e64c0 JK |
409 | return -IPSET_ERR_TIMEOUT; |
410 | ext->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); | |
411 | } | |
34d666d4 | 412 | if (tb[IPSET_ATTR_BYTES] || tb[IPSET_ATTR_PACKETS]) { |
edda0791 | 413 | if (!SET_WITH_COUNTER(set)) |
34d666d4 JK |
414 | return -IPSET_ERR_COUNTER; |
415 | if (tb[IPSET_ATTR_BYTES]) | |
416 | ext->bytes = be64_to_cpu(nla_get_be64( | |
417 | tb[IPSET_ATTR_BYTES])); | |
418 | if (tb[IPSET_ATTR_PACKETS]) | |
419 | ext->packets = be64_to_cpu(nla_get_be64( | |
420 | tb[IPSET_ATTR_PACKETS])); | |
421 | } | |
68b63f08 | 422 | if (tb[IPSET_ATTR_COMMENT]) { |
edda0791 | 423 | if (!SET_WITH_COMMENT(set)) |
68b63f08 OS |
424 | return -IPSET_ERR_COMMENT; |
425 | ext->comment = ip_set_comment_uget(tb[IPSET_ATTR_COMMENT]); | |
426 | } | |
0e9871e3 | 427 | if (tb[IPSET_ATTR_SKBMARK]) { |
edda0791 | 428 | if (!SET_WITH_SKBINFO(set)) |
0e9871e3 AD |
429 | return -IPSET_ERR_SKBINFO; |
430 | fullmark = be64_to_cpu(nla_get_be64(tb[IPSET_ATTR_SKBMARK])); | |
bec810d9 JK |
431 | ext->skbinfo.skbmark = fullmark >> 32; |
432 | ext->skbinfo.skbmarkmask = fullmark & 0xffffffff; | |
0e9871e3 AD |
433 | } |
434 | if (tb[IPSET_ATTR_SKBPRIO]) { | |
edda0791 | 435 | if (!SET_WITH_SKBINFO(set)) |
0e9871e3 | 436 | return -IPSET_ERR_SKBINFO; |
bec810d9 JK |
437 | ext->skbinfo.skbprio = |
438 | be32_to_cpu(nla_get_be32(tb[IPSET_ATTR_SKBPRIO])); | |
0e9871e3 AD |
439 | } |
440 | if (tb[IPSET_ATTR_SKBQUEUE]) { | |
edda0791 | 441 | if (!SET_WITH_SKBINFO(set)) |
0e9871e3 | 442 | return -IPSET_ERR_SKBINFO; |
bec810d9 JK |
443 | ext->skbinfo.skbqueue = |
444 | be16_to_cpu(nla_get_be16(tb[IPSET_ATTR_SKBQUEUE])); | |
0e9871e3 | 445 | } |
075e64c0 JK |
446 | return 0; |
447 | } | |
448 | EXPORT_SYMBOL_GPL(ip_set_get_extensions); | |
449 | ||
a3b1c1eb DV |
450 | int |
451 | ip_set_put_extensions(struct sk_buff *skb, const struct ip_set *set, | |
452 | const void *e, bool active) | |
453 | { | |
454 | if (SET_WITH_TIMEOUT(set)) { | |
455 | unsigned long *timeout = ext_timeout(e, set); | |
456 | ||
457 | if (nla_put_net32(skb, IPSET_ATTR_TIMEOUT, | |
458 | htonl(active ? ip_set_timeout_get(timeout) | |
459 | : *timeout))) | |
460 | return -EMSGSIZE; | |
461 | } | |
462 | if (SET_WITH_COUNTER(set) && | |
463 | ip_set_put_counter(skb, ext_counter(e, set))) | |
464 | return -EMSGSIZE; | |
465 | if (SET_WITH_COMMENT(set) && | |
466 | ip_set_put_comment(skb, ext_comment(e, set))) | |
467 | return -EMSGSIZE; | |
468 | if (SET_WITH_SKBINFO(set) && | |
469 | ip_set_put_skbinfo(skb, ext_skbinfo(e, set))) | |
470 | return -EMSGSIZE; | |
471 | return 0; | |
472 | } | |
473 | EXPORT_SYMBOL_GPL(ip_set_put_extensions); | |
474 | ||
4750005a JK |
475 | bool |
476 | ip_set_match_extensions(struct ip_set *set, const struct ip_set_ext *ext, | |
477 | struct ip_set_ext *mext, u32 flags, void *data) | |
478 | { | |
479 | if (SET_WITH_TIMEOUT(set) && | |
480 | ip_set_timeout_expired(ext_timeout(data, set))) | |
481 | return false; | |
482 | if (SET_WITH_COUNTER(set)) { | |
483 | struct ip_set_counter *counter = ext_counter(data, set); | |
484 | ||
485 | if (flags & IPSET_FLAG_MATCH_COUNTERS && | |
486 | !(ip_set_match_counter(ip_set_get_packets(counter), | |
487 | mext->packets, mext->packets_op) && | |
488 | ip_set_match_counter(ip_set_get_bytes(counter), | |
489 | mext->bytes, mext->bytes_op))) | |
490 | return false; | |
491 | ip_set_update_counter(counter, ext, flags); | |
492 | } | |
493 | if (SET_WITH_SKBINFO(set)) | |
494 | ip_set_get_skbinfo(ext_skbinfo(data, set), | |
495 | ext, mext, flags); | |
496 | return true; | |
497 | } | |
498 | EXPORT_SYMBOL_GPL(ip_set_match_extensions); | |
499 | ||
ca0f6a5c | 500 | /* Creating/destroying/renaming/swapping affect the existence and |
a7b4f989 JK |
501 | * the properties of a set. All of these can be executed from userspace |
502 | * only and serialized by the nfnl mutex indirectly from nfnetlink. | |
503 | * | |
504 | * Sets are identified by their index in ip_set_list and the index | |
505 | * is used by the external references (set/SET netfilter modules). | |
506 | * | |
507 | * The set behind an index may change by swapping only, from userspace. | |
508 | */ | |
509 | ||
510 | static inline void | |
9076aea7 | 511 | __ip_set_get(struct ip_set *set) |
a7b4f989 | 512 | { |
2f9f28b2 | 513 | write_lock_bh(&ip_set_ref_lock); |
9076aea7 | 514 | set->ref++; |
2f9f28b2 | 515 | write_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
516 | } |
517 | ||
518 | static inline void | |
9076aea7 | 519 | __ip_set_put(struct ip_set *set) |
a7b4f989 | 520 | { |
2f9f28b2 | 521 | write_lock_bh(&ip_set_ref_lock); |
9076aea7 JK |
522 | BUG_ON(set->ref == 0); |
523 | set->ref--; | |
2f9f28b2 | 524 | write_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
525 | } |
526 | ||
596cf3fe VP |
527 | /* set->ref can be swapped out by ip_set_swap, netlink events (like dump) need |
528 | * a separate reference counter | |
529 | */ | |
596cf3fe VP |
530 | static inline void |
531 | __ip_set_put_netlink(struct ip_set *set) | |
532 | { | |
533 | write_lock_bh(&ip_set_ref_lock); | |
534 | BUG_ON(set->ref_netlink == 0); | |
535 | set->ref_netlink--; | |
536 | write_unlock_bh(&ip_set_ref_lock); | |
537 | } | |
538 | ||
ca0f6a5c | 539 | /* Add, del and test set entries from kernel. |
a7b4f989 JK |
540 | * |
541 | * The set behind the index must exist and must be referenced | |
542 | * so it can't be destroyed (or changed) under our foot. | |
543 | */ | |
544 | ||
9076aea7 | 545 | static inline struct ip_set * |
1785e8f4 | 546 | ip_set_rcu_get(struct net *net, ip_set_id_t index) |
9076aea7 JK |
547 | { |
548 | struct ip_set *set; | |
1785e8f4 | 549 | struct ip_set_net *inst = ip_set_pernet(net); |
9076aea7 JK |
550 | |
551 | rcu_read_lock(); | |
552 | /* ip_set_list itself needs to be protected */ | |
1785e8f4 | 553 | set = rcu_dereference(inst->ip_set_list)[index]; |
9076aea7 JK |
554 | rcu_read_unlock(); |
555 | ||
556 | return set; | |
557 | } | |
558 | ||
a7b4f989 JK |
559 | int |
560 | ip_set_test(ip_set_id_t index, const struct sk_buff *skb, | |
075e64c0 | 561 | const struct xt_action_param *par, struct ip_set_adt_opt *opt) |
a7b4f989 | 562 | { |
613dbd95 | 563 | struct ip_set *set = ip_set_rcu_get(xt_net(par), index); |
a7b4f989 JK |
564 | int ret = 0; |
565 | ||
ca0f6a5c | 566 | BUG_ON(!set); |
a7b4f989 JK |
567 | pr_debug("set %s, index %u\n", set->name, index); |
568 | ||
ac8cc925 | 569 | if (opt->dim < set->type->dimension || |
c15f1c83 | 570 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
a7b4f989 JK |
571 | return 0; |
572 | ||
b57b2d1f | 573 | rcu_read_lock_bh(); |
b66554cf | 574 | ret = set->variant->kadt(set, skb, par, IPSET_TEST, opt); |
b57b2d1f | 575 | rcu_read_unlock_bh(); |
a7b4f989 JK |
576 | |
577 | if (ret == -EAGAIN) { | |
578 | /* Type requests element to be completed */ | |
1a84db56 | 579 | pr_debug("element must be completed, ADD is triggered\n"); |
b57b2d1f | 580 | spin_lock_bh(&set->lock); |
b66554cf | 581 | set->variant->kadt(set, skb, par, IPSET_ADD, opt); |
b57b2d1f | 582 | spin_unlock_bh(&set->lock); |
a7b4f989 | 583 | ret = 1; |
3e0304a5 JK |
584 | } else { |
585 | /* --return-nomatch: invert matched element */ | |
6e01781d | 586 | if ((opt->cmdflags & IPSET_FLAG_RETURN_NOMATCH) && |
3e0304a5 JK |
587 | (set->type->features & IPSET_TYPE_NOMATCH) && |
588 | (ret > 0 || ret == -ENOTEMPTY)) | |
589 | ret = -ret; | |
a7b4f989 JK |
590 | } |
591 | ||
592 | /* Convert error codes to nomatch */ | |
593 | return (ret < 0 ? 0 : ret); | |
594 | } | |
595 | EXPORT_SYMBOL_GPL(ip_set_test); | |
596 | ||
597 | int | |
598 | ip_set_add(ip_set_id_t index, const struct sk_buff *skb, | |
075e64c0 | 599 | const struct xt_action_param *par, struct ip_set_adt_opt *opt) |
a7b4f989 | 600 | { |
613dbd95 | 601 | struct ip_set *set = ip_set_rcu_get(xt_net(par), index); |
a7b4f989 JK |
602 | int ret; |
603 | ||
ca0f6a5c | 604 | BUG_ON(!set); |
a7b4f989 JK |
605 | pr_debug("set %s, index %u\n", set->name, index); |
606 | ||
ac8cc925 | 607 | if (opt->dim < set->type->dimension || |
c15f1c83 | 608 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
35f6e63a | 609 | return -IPSET_ERR_TYPE_MISMATCH; |
a7b4f989 | 610 | |
b57b2d1f | 611 | spin_lock_bh(&set->lock); |
b66554cf | 612 | ret = set->variant->kadt(set, skb, par, IPSET_ADD, opt); |
b57b2d1f | 613 | spin_unlock_bh(&set->lock); |
a7b4f989 JK |
614 | |
615 | return ret; | |
616 | } | |
617 | EXPORT_SYMBOL_GPL(ip_set_add); | |
618 | ||
619 | int | |
620 | ip_set_del(ip_set_id_t index, const struct sk_buff *skb, | |
075e64c0 | 621 | const struct xt_action_param *par, struct ip_set_adt_opt *opt) |
a7b4f989 | 622 | { |
613dbd95 | 623 | struct ip_set *set = ip_set_rcu_get(xt_net(par), index); |
a7b4f989 JK |
624 | int ret = 0; |
625 | ||
ca0f6a5c | 626 | BUG_ON(!set); |
a7b4f989 JK |
627 | pr_debug("set %s, index %u\n", set->name, index); |
628 | ||
ac8cc925 | 629 | if (opt->dim < set->type->dimension || |
c15f1c83 | 630 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
35f6e63a | 631 | return -IPSET_ERR_TYPE_MISMATCH; |
a7b4f989 | 632 | |
b57b2d1f | 633 | spin_lock_bh(&set->lock); |
b66554cf | 634 | ret = set->variant->kadt(set, skb, par, IPSET_DEL, opt); |
b57b2d1f | 635 | spin_unlock_bh(&set->lock); |
a7b4f989 JK |
636 | |
637 | return ret; | |
638 | } | |
639 | EXPORT_SYMBOL_GPL(ip_set_del); | |
640 | ||
ca0f6a5c | 641 | /* Find set by name, reference it once. The reference makes sure the |
a7b4f989 JK |
642 | * thing pointed to, does not go away under our feet. |
643 | * | |
a7b4f989 JK |
644 | */ |
645 | ip_set_id_t | |
1785e8f4 | 646 | ip_set_get_byname(struct net *net, const char *name, struct ip_set **set) |
a7b4f989 JK |
647 | { |
648 | ip_set_id_t i, index = IPSET_INVALID_ID; | |
649 | struct ip_set *s; | |
1785e8f4 | 650 | struct ip_set_net *inst = ip_set_pernet(net); |
a7b4f989 | 651 | |
9076aea7 | 652 | rcu_read_lock(); |
1785e8f4 VL |
653 | for (i = 0; i < inst->ip_set_max; i++) { |
654 | s = rcu_dereference(inst->ip_set_list)[i]; | |
ca0f6a5c | 655 | if (s && STRNCMP(s->name, name)) { |
9076aea7 | 656 | __ip_set_get(s); |
a7b4f989 JK |
657 | index = i; |
658 | *set = s; | |
9076aea7 | 659 | break; |
a7b4f989 JK |
660 | } |
661 | } | |
9076aea7 | 662 | rcu_read_unlock(); |
a7b4f989 JK |
663 | |
664 | return index; | |
665 | } | |
666 | EXPORT_SYMBOL_GPL(ip_set_get_byname); | |
667 | ||
ca0f6a5c | 668 | /* If the given set pointer points to a valid set, decrement |
a7b4f989 JK |
669 | * reference count by 1. The caller shall not assume the index |
670 | * to be valid, after calling this function. | |
671 | * | |
a7b4f989 | 672 | */ |
1785e8f4 VL |
673 | |
674 | static inline void | |
675 | __ip_set_put_byindex(struct ip_set_net *inst, ip_set_id_t index) | |
a7b4f989 | 676 | { |
9076aea7 JK |
677 | struct ip_set *set; |
678 | ||
679 | rcu_read_lock(); | |
1785e8f4 | 680 | set = rcu_dereference(inst->ip_set_list)[index]; |
ca0f6a5c | 681 | if (set) |
9076aea7 JK |
682 | __ip_set_put(set); |
683 | rcu_read_unlock(); | |
a7b4f989 | 684 | } |
1785e8f4 VL |
685 | |
686 | void | |
687 | ip_set_put_byindex(struct net *net, ip_set_id_t index) | |
688 | { | |
689 | struct ip_set_net *inst = ip_set_pernet(net); | |
690 | ||
691 | __ip_set_put_byindex(inst, index); | |
692 | } | |
a7b4f989 JK |
693 | EXPORT_SYMBOL_GPL(ip_set_put_byindex); |
694 | ||
ca0f6a5c | 695 | /* Get the name of a set behind a set index. |
a7b4f989 JK |
696 | * We assume the set is referenced, so it does exist and |
697 | * can't be destroyed. The set cannot be renamed due to | |
698 | * the referencing either. | |
699 | * | |
a7b4f989 JK |
700 | */ |
701 | const char * | |
1785e8f4 | 702 | ip_set_name_byindex(struct net *net, ip_set_id_t index) |
a7b4f989 | 703 | { |
1785e8f4 | 704 | const struct ip_set *set = ip_set_rcu_get(net, index); |
a7b4f989 | 705 | |
ca0f6a5c | 706 | BUG_ON(!set); |
2f9f28b2 | 707 | BUG_ON(set->ref == 0); |
a7b4f989 JK |
708 | |
709 | /* Referenced, so it's safe */ | |
710 | return set->name; | |
711 | } | |
712 | EXPORT_SYMBOL_GPL(ip_set_name_byindex); | |
713 | ||
ca0f6a5c | 714 | /* Routines to call by external subsystems, which do not |
a7b4f989 JK |
715 | * call nfnl_lock for us. |
716 | */ | |
717 | ||
ca0f6a5c | 718 | /* Find set by index, reference it once. The reference makes sure the |
a7b4f989 JK |
719 | * thing pointed to, does not go away under our feet. |
720 | * | |
721 | * The nfnl mutex is used in the function. | |
722 | */ | |
723 | ip_set_id_t | |
1785e8f4 | 724 | ip_set_nfnl_get_byindex(struct net *net, ip_set_id_t index) |
a7b4f989 | 725 | { |
9076aea7 | 726 | struct ip_set *set; |
1785e8f4 | 727 | struct ip_set_net *inst = ip_set_pernet(net); |
9076aea7 | 728 | |
0f9f5e1b | 729 | if (index >= inst->ip_set_max) |
a7b4f989 JK |
730 | return IPSET_INVALID_ID; |
731 | ||
c14b78e7 | 732 | nfnl_lock(NFNL_SUBSYS_IPSET); |
3e90ebd3 | 733 | set = ip_set(inst, index); |
9076aea7 JK |
734 | if (set) |
735 | __ip_set_get(set); | |
a7b4f989 JK |
736 | else |
737 | index = IPSET_INVALID_ID; | |
c14b78e7 | 738 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
739 | |
740 | return index; | |
741 | } | |
742 | EXPORT_SYMBOL_GPL(ip_set_nfnl_get_byindex); | |
743 | ||
ca0f6a5c | 744 | /* If the given set pointer points to a valid set, decrement |
a7b4f989 JK |
745 | * reference count by 1. The caller shall not assume the index |
746 | * to be valid, after calling this function. | |
747 | * | |
748 | * The nfnl mutex is used in the function. | |
749 | */ | |
750 | void | |
1785e8f4 | 751 | ip_set_nfnl_put(struct net *net, ip_set_id_t index) |
a7b4f989 | 752 | { |
9076aea7 | 753 | struct ip_set *set; |
1785e8f4 VL |
754 | struct ip_set_net *inst = ip_set_pernet(net); |
755 | ||
c14b78e7 | 756 | nfnl_lock(NFNL_SUBSYS_IPSET); |
1785e8f4 | 757 | if (!inst->is_deleted) { /* already deleted from ip_set_net_exit() */ |
3e90ebd3 | 758 | set = ip_set(inst, index); |
ca0f6a5c | 759 | if (set) |
1785e8f4 VL |
760 | __ip_set_put(set); |
761 | } | |
c14b78e7 | 762 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
763 | } |
764 | EXPORT_SYMBOL_GPL(ip_set_nfnl_put); | |
765 | ||
ca0f6a5c | 766 | /* Communication protocol with userspace over netlink. |
a7b4f989 | 767 | * |
2f9f28b2 | 768 | * The commands are serialized by the nfnl mutex. |
a7b4f989 JK |
769 | */ |
770 | ||
771 | static inline bool | |
772 | protocol_failed(const struct nlattr * const tb[]) | |
773 | { | |
774 | return !tb[IPSET_ATTR_PROTOCOL] || | |
775 | nla_get_u8(tb[IPSET_ATTR_PROTOCOL]) != IPSET_PROTOCOL; | |
776 | } | |
777 | ||
778 | static inline u32 | |
779 | flag_exist(const struct nlmsghdr *nlh) | |
780 | { | |
781 | return nlh->nlmsg_flags & NLM_F_EXCL ? 0 : IPSET_FLAG_EXIST; | |
782 | } | |
783 | ||
784 | static struct nlmsghdr * | |
15e47304 | 785 | start_msg(struct sk_buff *skb, u32 portid, u32 seq, unsigned int flags, |
a7b4f989 JK |
786 | enum ipset_cmd cmd) |
787 | { | |
788 | struct nlmsghdr *nlh; | |
789 | struct nfgenmsg *nfmsg; | |
790 | ||
dedb67c4 | 791 | nlh = nlmsg_put(skb, portid, seq, nfnl_msg_type(NFNL_SUBSYS_IPSET, cmd), |
a7b4f989 | 792 | sizeof(*nfmsg), flags); |
ca0f6a5c | 793 | if (!nlh) |
a7b4f989 JK |
794 | return NULL; |
795 | ||
796 | nfmsg = nlmsg_data(nlh); | |
c15f1c83 | 797 | nfmsg->nfgen_family = NFPROTO_IPV4; |
a7b4f989 JK |
798 | nfmsg->version = NFNETLINK_V0; |
799 | nfmsg->res_id = 0; | |
800 | ||
801 | return nlh; | |
802 | } | |
803 | ||
804 | /* Create a set */ | |
805 | ||
806 | static const struct nla_policy ip_set_create_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
807 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
808 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
809 | .len = IPSET_MAXNAMELEN - 1 }, | |
810 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, | |
811 | .len = IPSET_MAXNAMELEN - 1}, | |
812 | [IPSET_ATTR_REVISION] = { .type = NLA_U8 }, | |
813 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, | |
814 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, | |
815 | }; | |
816 | ||
9076aea7 | 817 | static struct ip_set * |
1785e8f4 | 818 | find_set_and_id(struct ip_set_net *inst, const char *name, ip_set_id_t *id) |
a7b4f989 | 819 | { |
9076aea7 JK |
820 | struct ip_set *set = NULL; |
821 | ip_set_id_t i; | |
a7b4f989 | 822 | |
9076aea7 | 823 | *id = IPSET_INVALID_ID; |
1785e8f4 | 824 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 825 | set = ip_set(inst, i); |
ca0f6a5c | 826 | if (set && STRNCMP(set->name, name)) { |
9076aea7 JK |
827 | *id = i; |
828 | break; | |
829 | } | |
a7b4f989 | 830 | } |
9076aea7 | 831 | return (*id == IPSET_INVALID_ID ? NULL : set); |
a7b4f989 JK |
832 | } |
833 | ||
834 | static inline struct ip_set * | |
1785e8f4 | 835 | find_set(struct ip_set_net *inst, const char *name) |
a7b4f989 | 836 | { |
9076aea7 | 837 | ip_set_id_t id; |
a7b4f989 | 838 | |
1785e8f4 | 839 | return find_set_and_id(inst, name, &id); |
a7b4f989 JK |
840 | } |
841 | ||
842 | static int | |
1785e8f4 VL |
843 | find_free_id(struct ip_set_net *inst, const char *name, ip_set_id_t *index, |
844 | struct ip_set **set) | |
a7b4f989 | 845 | { |
9076aea7 | 846 | struct ip_set *s; |
a7b4f989 JK |
847 | ip_set_id_t i; |
848 | ||
849 | *index = IPSET_INVALID_ID; | |
1785e8f4 | 850 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 851 | s = ip_set(inst, i); |
ca0f6a5c | 852 | if (!s) { |
a7b4f989 JK |
853 | if (*index == IPSET_INVALID_ID) |
854 | *index = i; | |
22496f09 | 855 | } else if (STRNCMP(name, s->name)) { |
a7b4f989 | 856 | /* Name clash */ |
9076aea7 | 857 | *set = s; |
a7b4f989 JK |
858 | return -EEXIST; |
859 | } | |
860 | } | |
861 | if (*index == IPSET_INVALID_ID) | |
862 | /* No free slot remained */ | |
863 | return -IPSET_ERR_MAX_SETS; | |
864 | return 0; | |
865 | } | |
866 | ||
7b8002a1 PNA |
867 | static int ip_set_none(struct net *net, struct sock *ctnl, struct sk_buff *skb, |
868 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
869 | const struct nlattr * const attr[], |
870 | struct netlink_ext_ack *extack) | |
d31f4d44 TB |
871 | { |
872 | return -EOPNOTSUPP; | |
873 | } | |
874 | ||
7b8002a1 PNA |
875 | static int ip_set_create(struct net *net, struct sock *ctnl, |
876 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
877 | const struct nlattr * const attr[], |
878 | struct netlink_ext_ack *extack) | |
a7b4f989 | 879 | { |
1785e8f4 | 880 | struct ip_set_net *inst = ip_set_pernet(net); |
9846ada1 | 881 | struct ip_set *set, *clash = NULL; |
a7b4f989 | 882 | ip_set_id_t index = IPSET_INVALID_ID; |
ca0f6a5c | 883 | struct nlattr *tb[IPSET_ATTR_CREATE_MAX + 1] = {}; |
a7b4f989 JK |
884 | const char *name, *typename; |
885 | u8 family, revision; | |
886 | u32 flags = flag_exist(nlh); | |
887 | int ret = 0; | |
888 | ||
889 | if (unlikely(protocol_failed(attr) || | |
ca0f6a5c JK |
890 | !attr[IPSET_ATTR_SETNAME] || |
891 | !attr[IPSET_ATTR_TYPENAME] || | |
892 | !attr[IPSET_ATTR_REVISION] || | |
893 | !attr[IPSET_ATTR_FAMILY] || | |
894 | (attr[IPSET_ATTR_DATA] && | |
a7b4f989 JK |
895 | !flag_nested(attr[IPSET_ATTR_DATA])))) |
896 | return -IPSET_ERR_PROTOCOL; | |
897 | ||
898 | name = nla_data(attr[IPSET_ATTR_SETNAME]); | |
899 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); | |
900 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); | |
901 | revision = nla_get_u8(attr[IPSET_ATTR_REVISION]); | |
902 | pr_debug("setname: %s, typename: %s, family: %s, revision: %u\n", | |
903 | name, typename, family_name(family), revision); | |
904 | ||
ca0f6a5c | 905 | /* First, and without any locks, allocate and initialize |
a7b4f989 JK |
906 | * a normal base set structure. |
907 | */ | |
ca0f6a5c | 908 | set = kzalloc(sizeof(*set), GFP_KERNEL); |
a7b4f989 JK |
909 | if (!set) |
910 | return -ENOMEM; | |
b57b2d1f | 911 | spin_lock_init(&set->lock); |
a7b4f989 | 912 | strlcpy(set->name, name, IPSET_MAXNAMELEN); |
a7b4f989 | 913 | set->family = family; |
f1e00b39 | 914 | set->revision = revision; |
a7b4f989 | 915 | |
ca0f6a5c | 916 | /* Next, check that we know the type, and take |
a7b4f989 JK |
917 | * a reference on the type, to make sure it stays available |
918 | * while constructing our new set. | |
919 | * | |
920 | * After referencing the type, we try to create the type | |
921 | * specific part of the set without holding any locks. | |
922 | */ | |
ca0f6a5c | 923 | ret = find_set_type_get(typename, family, revision, &set->type); |
a7b4f989 JK |
924 | if (ret) |
925 | goto out; | |
926 | ||
ca0f6a5c | 927 | /* Without holding any locks, create private part. */ |
a7b4f989 | 928 | if (attr[IPSET_ATTR_DATA] && |
8da560ce | 929 | nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA], |
fceb6435 | 930 | set->type->create_policy, NULL)) { |
15b4d93f JK |
931 | ret = -IPSET_ERR_PROTOCOL; |
932 | goto put_out; | |
a7b4f989 JK |
933 | } |
934 | ||
1785e8f4 | 935 | ret = set->type->create(net, set, tb, flags); |
a7b4f989 JK |
936 | if (ret != 0) |
937 | goto put_out; | |
938 | ||
939 | /* BTW, ret==0 here. */ | |
940 | ||
ca0f6a5c | 941 | /* Here, we have a valid, constructed set and we are protected |
2f9f28b2 JK |
942 | * by the nfnl mutex. Find the first free index in ip_set_list |
943 | * and check clashing. | |
a7b4f989 | 944 | */ |
1785e8f4 | 945 | ret = find_free_id(inst, set->name, &index, &clash); |
9076aea7 | 946 | if (ret == -EEXIST) { |
a7b4f989 | 947 | /* If this is the same set and requested, ignore error */ |
9076aea7 | 948 | if ((flags & IPSET_FLAG_EXIST) && |
22496f09 | 949 | STRNCMP(set->type->name, clash->type->name) && |
a7b4f989 | 950 | set->type->family == clash->type->family && |
f1e00b39 JK |
951 | set->type->revision_min == clash->type->revision_min && |
952 | set->type->revision_max == clash->type->revision_max && | |
a7b4f989 JK |
953 | set->variant->same_set(set, clash)) |
954 | ret = 0; | |
955 | goto cleanup; | |
9076aea7 JK |
956 | } else if (ret == -IPSET_ERR_MAX_SETS) { |
957 | struct ip_set **list, **tmp; | |
1785e8f4 | 958 | ip_set_id_t i = inst->ip_set_max + IP_SET_INC; |
9076aea7 | 959 | |
1785e8f4 | 960 | if (i < inst->ip_set_max || i == IPSET_INVALID_ID) |
9076aea7 JK |
961 | /* Wraparound */ |
962 | goto cleanup; | |
963 | ||
ca0f6a5c | 964 | list = kcalloc(i, sizeof(struct ip_set *), GFP_KERNEL); |
9076aea7 JK |
965 | if (!list) |
966 | goto cleanup; | |
967 | /* nfnl mutex is held, both lists are valid */ | |
3e90ebd3 | 968 | tmp = ip_set_dereference(inst->ip_set_list); |
1785e8f4 VL |
969 | memcpy(list, tmp, sizeof(struct ip_set *) * inst->ip_set_max); |
970 | rcu_assign_pointer(inst->ip_set_list, list); | |
9076aea7 JK |
971 | /* Make sure all current packets have passed through */ |
972 | synchronize_net(); | |
973 | /* Use new list */ | |
1785e8f4 VL |
974 | index = inst->ip_set_max; |
975 | inst->ip_set_max = i; | |
9076aea7 JK |
976 | kfree(tmp); |
977 | ret = 0; | |
ca0f6a5c | 978 | } else if (ret) { |
9076aea7 | 979 | goto cleanup; |
ca0f6a5c | 980 | } |
a7b4f989 | 981 | |
ca0f6a5c | 982 | /* Finally! Add our shiny new set to the list, and be done. */ |
a7b4f989 | 983 | pr_debug("create: '%s' created with index %u!\n", set->name, index); |
3e90ebd3 | 984 | ip_set(inst, index) = set; |
a7b4f989 JK |
985 | |
986 | return ret; | |
987 | ||
988 | cleanup: | |
989 | set->variant->destroy(set); | |
990 | put_out: | |
991 | module_put(set->type->me); | |
992 | out: | |
993 | kfree(set); | |
994 | return ret; | |
995 | } | |
996 | ||
997 | /* Destroy sets */ | |
998 | ||
999 | static const struct nla_policy | |
1000 | ip_set_setname_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1001 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1002 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
1003 | .len = IPSET_MAXNAMELEN - 1 }, | |
1004 | }; | |
1005 | ||
1006 | static void | |
9c1ba5c8 | 1007 | ip_set_destroy_set(struct ip_set *set) |
a7b4f989 | 1008 | { |
a7b4f989 | 1009 | pr_debug("set: %s\n", set->name); |
a7b4f989 JK |
1010 | |
1011 | /* Must call it without holding any lock */ | |
1012 | set->variant->destroy(set); | |
1013 | module_put(set->type->me); | |
1014 | kfree(set); | |
1015 | } | |
1016 | ||
7b8002a1 PNA |
1017 | static int ip_set_destroy(struct net *net, struct sock *ctnl, |
1018 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1019 | const struct nlattr * const attr[], |
1020 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1021 | { |
7b8002a1 | 1022 | struct ip_set_net *inst = ip_set_pernet(net); |
9076aea7 | 1023 | struct ip_set *s; |
a7b4f989 | 1024 | ip_set_id_t i; |
2f9f28b2 | 1025 | int ret = 0; |
a7b4f989 JK |
1026 | |
1027 | if (unlikely(protocol_failed(attr))) | |
1028 | return -IPSET_ERR_PROTOCOL; | |
1029 | ||
45040978 JK |
1030 | /* Must wait for flush to be really finished in list:set */ |
1031 | rcu_barrier(); | |
1032 | ||
2f9f28b2 JK |
1033 | /* Commands are serialized and references are |
1034 | * protected by the ip_set_ref_lock. | |
1035 | * External systems (i.e. xt_set) must call | |
1036 | * ip_set_put|get_nfnl_* functions, that way we | |
1037 | * can safely check references here. | |
1038 | * | |
1039 | * list:set timer can only decrement the reference | |
1040 | * counter, so if it's already zero, we can proceed | |
1041 | * without holding the lock. | |
1042 | */ | |
1043 | read_lock_bh(&ip_set_ref_lock); | |
a7b4f989 | 1044 | if (!attr[IPSET_ATTR_SETNAME]) { |
1785e8f4 | 1045 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 1046 | s = ip_set(inst, i); |
596cf3fe | 1047 | if (s && (s->ref || s->ref_netlink)) { |
9d883232 | 1048 | ret = -IPSET_ERR_BUSY; |
2f9f28b2 JK |
1049 | goto out; |
1050 | } | |
a7b4f989 | 1051 | } |
9c1ba5c8 | 1052 | inst->is_destroyed = true; |
2f9f28b2 | 1053 | read_unlock_bh(&ip_set_ref_lock); |
1785e8f4 | 1054 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 1055 | s = ip_set(inst, i); |
9c1ba5c8 JK |
1056 | if (s) { |
1057 | ip_set(inst, i) = NULL; | |
1058 | ip_set_destroy_set(s); | |
1059 | } | |
a7b4f989 | 1060 | } |
9c1ba5c8 JK |
1061 | /* Modified by ip_set_destroy() only, which is serialized */ |
1062 | inst->is_destroyed = false; | |
a7b4f989 | 1063 | } else { |
1785e8f4 VL |
1064 | s = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), |
1065 | &i); | |
ca0f6a5c | 1066 | if (!s) { |
2f9f28b2 JK |
1067 | ret = -ENOENT; |
1068 | goto out; | |
596cf3fe | 1069 | } else if (s->ref || s->ref_netlink) { |
2f9f28b2 JK |
1070 | ret = -IPSET_ERR_BUSY; |
1071 | goto out; | |
1072 | } | |
9c1ba5c8 | 1073 | ip_set(inst, i) = NULL; |
2f9f28b2 | 1074 | read_unlock_bh(&ip_set_ref_lock); |
a7b4f989 | 1075 | |
9c1ba5c8 | 1076 | ip_set_destroy_set(s); |
a7b4f989 JK |
1077 | } |
1078 | return 0; | |
2f9f28b2 JK |
1079 | out: |
1080 | read_unlock_bh(&ip_set_ref_lock); | |
1081 | return ret; | |
a7b4f989 JK |
1082 | } |
1083 | ||
1084 | /* Flush sets */ | |
1085 | ||
1086 | static void | |
1087 | ip_set_flush_set(struct ip_set *set) | |
1088 | { | |
1089 | pr_debug("set: %s\n", set->name); | |
1090 | ||
b57b2d1f | 1091 | spin_lock_bh(&set->lock); |
a7b4f989 | 1092 | set->variant->flush(set); |
b57b2d1f | 1093 | spin_unlock_bh(&set->lock); |
a7b4f989 JK |
1094 | } |
1095 | ||
7b8002a1 PNA |
1096 | static int ip_set_flush(struct net *net, struct sock *ctnl, struct sk_buff *skb, |
1097 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
1098 | const struct nlattr * const attr[], |
1099 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1100 | { |
7b8002a1 | 1101 | struct ip_set_net *inst = ip_set_pernet(net); |
9076aea7 | 1102 | struct ip_set *s; |
a7b4f989 JK |
1103 | ip_set_id_t i; |
1104 | ||
1105 | if (unlikely(protocol_failed(attr))) | |
9184a9cb | 1106 | return -IPSET_ERR_PROTOCOL; |
a7b4f989 JK |
1107 | |
1108 | if (!attr[IPSET_ATTR_SETNAME]) { | |
1785e8f4 | 1109 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 1110 | s = ip_set(inst, i); |
ca0f6a5c | 1111 | if (s) |
9076aea7 JK |
1112 | ip_set_flush_set(s); |
1113 | } | |
a7b4f989 | 1114 | } else { |
1785e8f4 | 1115 | s = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
ca0f6a5c | 1116 | if (!s) |
a7b4f989 JK |
1117 | return -ENOENT; |
1118 | ||
9076aea7 | 1119 | ip_set_flush_set(s); |
a7b4f989 JK |
1120 | } |
1121 | ||
1122 | return 0; | |
1123 | } | |
1124 | ||
1125 | /* Rename a set */ | |
1126 | ||
1127 | static const struct nla_policy | |
1128 | ip_set_setname2_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1129 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1130 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
1131 | .len = IPSET_MAXNAMELEN - 1 }, | |
1132 | [IPSET_ATTR_SETNAME2] = { .type = NLA_NUL_STRING, | |
1133 | .len = IPSET_MAXNAMELEN - 1 }, | |
1134 | }; | |
1135 | ||
7b8002a1 PNA |
1136 | static int ip_set_rename(struct net *net, struct sock *ctnl, |
1137 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1138 | const struct nlattr * const attr[], |
1139 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1140 | { |
7b8002a1 | 1141 | struct ip_set_net *inst = ip_set_pernet(net); |
9076aea7 | 1142 | struct ip_set *set, *s; |
a7b4f989 JK |
1143 | const char *name2; |
1144 | ip_set_id_t i; | |
2f9f28b2 | 1145 | int ret = 0; |
a7b4f989 JK |
1146 | |
1147 | if (unlikely(protocol_failed(attr) || | |
ca0f6a5c JK |
1148 | !attr[IPSET_ATTR_SETNAME] || |
1149 | !attr[IPSET_ATTR_SETNAME2])) | |
a7b4f989 JK |
1150 | return -IPSET_ERR_PROTOCOL; |
1151 | ||
1785e8f4 | 1152 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
ca0f6a5c | 1153 | if (!set) |
a7b4f989 | 1154 | return -ENOENT; |
2f9f28b2 JK |
1155 | |
1156 | read_lock_bh(&ip_set_ref_lock); | |
1157 | if (set->ref != 0) { | |
1158 | ret = -IPSET_ERR_REFERENCED; | |
1159 | goto out; | |
1160 | } | |
a7b4f989 JK |
1161 | |
1162 | name2 = nla_data(attr[IPSET_ATTR_SETNAME2]); | |
1785e8f4 | 1163 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 1164 | s = ip_set(inst, i); |
ca0f6a5c | 1165 | if (s && STRNCMP(s->name, name2)) { |
2f9f28b2 JK |
1166 | ret = -IPSET_ERR_EXIST_SETNAME2; |
1167 | goto out; | |
1168 | } | |
a7b4f989 JK |
1169 | } |
1170 | strncpy(set->name, name2, IPSET_MAXNAMELEN); | |
1171 | ||
2f9f28b2 JK |
1172 | out: |
1173 | read_unlock_bh(&ip_set_ref_lock); | |
1174 | return ret; | |
a7b4f989 JK |
1175 | } |
1176 | ||
1177 | /* Swap two sets so that name/index points to the other. | |
1178 | * References and set names are also swapped. | |
1179 | * | |
2f9f28b2 JK |
1180 | * The commands are serialized by the nfnl mutex and references are |
1181 | * protected by the ip_set_ref_lock. The kernel interfaces | |
a7b4f989 JK |
1182 | * do not hold the mutex but the pointer settings are atomic |
1183 | * so the ip_set_list always contains valid pointers to the sets. | |
1184 | */ | |
1185 | ||
7b8002a1 PNA |
1186 | static int ip_set_swap(struct net *net, struct sock *ctnl, struct sk_buff *skb, |
1187 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
1188 | const struct nlattr * const attr[], |
1189 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1190 | { |
7b8002a1 | 1191 | struct ip_set_net *inst = ip_set_pernet(net); |
a7b4f989 JK |
1192 | struct ip_set *from, *to; |
1193 | ip_set_id_t from_id, to_id; | |
1194 | char from_name[IPSET_MAXNAMELEN]; | |
a7b4f989 JK |
1195 | |
1196 | if (unlikely(protocol_failed(attr) || | |
ca0f6a5c JK |
1197 | !attr[IPSET_ATTR_SETNAME] || |
1198 | !attr[IPSET_ATTR_SETNAME2])) | |
a7b4f989 JK |
1199 | return -IPSET_ERR_PROTOCOL; |
1200 | ||
1785e8f4 VL |
1201 | from = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), |
1202 | &from_id); | |
ca0f6a5c | 1203 | if (!from) |
a7b4f989 JK |
1204 | return -ENOENT; |
1205 | ||
1785e8f4 VL |
1206 | to = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME2]), |
1207 | &to_id); | |
ca0f6a5c | 1208 | if (!to) |
a7b4f989 JK |
1209 | return -IPSET_ERR_EXIST_SETNAME2; |
1210 | ||
a7b4f989 | 1211 | /* Features must not change. |
ca0f6a5c JK |
1212 | * Not an artifical restriction anymore, as we must prevent |
1213 | * possible loops created by swapping in setlist type of sets. | |
1214 | */ | |
a7b4f989 | 1215 | if (!(from->type->features == to->type->features && |
169faa2e | 1216 | from->family == to->family)) |
a7b4f989 JK |
1217 | return -IPSET_ERR_TYPE_MISMATCH; |
1218 | ||
e5173418 RL |
1219 | write_lock_bh(&ip_set_ref_lock); |
1220 | ||
1221 | if (from->ref_netlink || to->ref_netlink) { | |
1222 | write_unlock_bh(&ip_set_ref_lock); | |
596cf3fe | 1223 | return -EBUSY; |
e5173418 | 1224 | } |
596cf3fe | 1225 | |
a7b4f989 | 1226 | strncpy(from_name, from->name, IPSET_MAXNAMELEN); |
a7b4f989 | 1227 | strncpy(from->name, to->name, IPSET_MAXNAMELEN); |
a7b4f989 | 1228 | strncpy(to->name, from_name, IPSET_MAXNAMELEN); |
a7b4f989 | 1229 | |
2f9f28b2 | 1230 | swap(from->ref, to->ref); |
3e90ebd3 PM |
1231 | ip_set(inst, from_id) = to; |
1232 | ip_set(inst, to_id) = from; | |
2f9f28b2 | 1233 | write_unlock_bh(&ip_set_ref_lock); |
a7b4f989 JK |
1234 | |
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | /* List/save set data */ | |
1239 | ||
c1e2e043 JK |
1240 | #define DUMP_INIT 0 |
1241 | #define DUMP_ALL 1 | |
1242 | #define DUMP_ONE 2 | |
1243 | #define DUMP_LAST 3 | |
1244 | ||
1245 | #define DUMP_TYPE(arg) (((u32)(arg)) & 0x0000FFFF) | |
1246 | #define DUMP_FLAGS(arg) (((u32)(arg)) >> 16) | |
a7b4f989 JK |
1247 | |
1248 | static int | |
1249 | ip_set_dump_done(struct netlink_callback *cb) | |
1250 | { | |
93302880 | 1251 | if (cb->args[IPSET_CB_ARG0]) { |
c4c99783 JK |
1252 | struct ip_set_net *inst = |
1253 | (struct ip_set_net *)cb->args[IPSET_CB_NET]; | |
1254 | ip_set_id_t index = (ip_set_id_t)cb->args[IPSET_CB_INDEX]; | |
1255 | struct ip_set *set = ip_set(inst, index); | |
1256 | ||
1257 | if (set->variant->uref) | |
1258 | set->variant->uref(set, cb, false); | |
1259 | pr_debug("release set %s\n", set->name); | |
596cf3fe | 1260 | __ip_set_put_netlink(set); |
a7b4f989 JK |
1261 | } |
1262 | return 0; | |
1263 | } | |
1264 | ||
1265 | static inline void | |
1266 | dump_attrs(struct nlmsghdr *nlh) | |
1267 | { | |
1268 | const struct nlattr *attr; | |
1269 | int rem; | |
1270 | ||
1271 | pr_debug("dump nlmsg\n"); | |
1272 | nlmsg_for_each_attr(attr, nlh, sizeof(struct nfgenmsg), rem) { | |
1273 | pr_debug("type: %u, len %u\n", nla_type(attr), attr->nla_len); | |
1274 | } | |
1275 | } | |
1276 | ||
1277 | static int | |
93302880 | 1278 | dump_init(struct netlink_callback *cb, struct ip_set_net *inst) |
a7b4f989 JK |
1279 | { |
1280 | struct nlmsghdr *nlh = nlmsg_hdr(cb->skb); | |
573ce260 | 1281 | int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); |
ca0f6a5c | 1282 | struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1]; |
a7b4f989 | 1283 | struct nlattr *attr = (void *)nlh + min_len; |
c1e2e043 | 1284 | u32 dump_type; |
a7b4f989 JK |
1285 | ip_set_id_t index; |
1286 | ||
1287 | /* Second pass, so parser can't fail */ | |
fceb6435 JB |
1288 | nla_parse(cda, IPSET_ATTR_CMD_MAX, attr, nlh->nlmsg_len - min_len, |
1289 | ip_set_setname_policy, NULL); | |
a7b4f989 | 1290 | |
c1e2e043 | 1291 | if (cda[IPSET_ATTR_SETNAME]) { |
9076aea7 JK |
1292 | struct ip_set *set; |
1293 | ||
1785e8f4 | 1294 | set = find_set_and_id(inst, nla_data(cda[IPSET_ATTR_SETNAME]), |
9076aea7 | 1295 | &index); |
ca0f6a5c | 1296 | if (!set) |
c1e2e043 | 1297 | return -ENOENT; |
a7b4f989 | 1298 | |
c1e2e043 | 1299 | dump_type = DUMP_ONE; |
93302880 | 1300 | cb->args[IPSET_CB_INDEX] = index; |
ca0f6a5c | 1301 | } else { |
c1e2e043 | 1302 | dump_type = DUMP_ALL; |
ca0f6a5c | 1303 | } |
c1e2e043 JK |
1304 | |
1305 | if (cda[IPSET_ATTR_FLAGS]) { | |
1306 | u32 f = ip_set_get_h32(cda[IPSET_ATTR_FLAGS]); | |
ca0f6a5c | 1307 | |
c1e2e043 JK |
1308 | dump_type |= (f << 16); |
1309 | } | |
93302880 JK |
1310 | cb->args[IPSET_CB_NET] = (unsigned long)inst; |
1311 | cb->args[IPSET_CB_DUMP] = dump_type; | |
a7b4f989 | 1312 | |
a7b4f989 JK |
1313 | return 0; |
1314 | } | |
1315 | ||
1316 | static int | |
1317 | ip_set_dump_start(struct sk_buff *skb, struct netlink_callback *cb) | |
1318 | { | |
1319 | ip_set_id_t index = IPSET_INVALID_ID, max; | |
1320 | struct ip_set *set = NULL; | |
1321 | struct nlmsghdr *nlh = NULL; | |
15e47304 | 1322 | unsigned int flags = NETLINK_CB(cb->skb).portid ? NLM_F_MULTI : 0; |
93302880 | 1323 | struct ip_set_net *inst = ip_set_pernet(sock_net(skb->sk)); |
c1e2e043 | 1324 | u32 dump_type, dump_flags; |
9c1ba5c8 | 1325 | bool is_destroyed; |
a7b4f989 JK |
1326 | int ret = 0; |
1327 | ||
93302880 JK |
1328 | if (!cb->args[IPSET_CB_DUMP]) { |
1329 | ret = dump_init(cb, inst); | |
a7b4f989 JK |
1330 | if (ret < 0) { |
1331 | nlh = nlmsg_hdr(cb->skb); | |
1332 | /* We have to create and send the error message | |
ca0f6a5c JK |
1333 | * manually :-( |
1334 | */ | |
a7b4f989 | 1335 | if (nlh->nlmsg_flags & NLM_F_ACK) |
2d4bc933 | 1336 | netlink_ack(cb->skb, nlh, ret, NULL); |
a7b4f989 JK |
1337 | return ret; |
1338 | } | |
1339 | } | |
1340 | ||
93302880 | 1341 | if (cb->args[IPSET_CB_INDEX] >= inst->ip_set_max) |
a7b4f989 JK |
1342 | goto out; |
1343 | ||
93302880 JK |
1344 | dump_type = DUMP_TYPE(cb->args[IPSET_CB_DUMP]); |
1345 | dump_flags = DUMP_FLAGS(cb->args[IPSET_CB_DUMP]); | |
1346 | max = dump_type == DUMP_ONE ? cb->args[IPSET_CB_INDEX] + 1 | |
1347 | : inst->ip_set_max; | |
a8a8a093 | 1348 | dump_last: |
93302880 JK |
1349 | pr_debug("dump type, flag: %u %u index: %ld\n", |
1350 | dump_type, dump_flags, cb->args[IPSET_CB_INDEX]); | |
1351 | for (; cb->args[IPSET_CB_INDEX] < max; cb->args[IPSET_CB_INDEX]++) { | |
ca0f6a5c | 1352 | index = (ip_set_id_t)cb->args[IPSET_CB_INDEX]; |
9c1ba5c8 | 1353 | write_lock_bh(&ip_set_ref_lock); |
3e90ebd3 | 1354 | set = ip_set(inst, index); |
9c1ba5c8 JK |
1355 | is_destroyed = inst->is_destroyed; |
1356 | if (!set || is_destroyed) { | |
1357 | write_unlock_bh(&ip_set_ref_lock); | |
c1e2e043 | 1358 | if (dump_type == DUMP_ONE) { |
a7b4f989 JK |
1359 | ret = -ENOENT; |
1360 | goto out; | |
1361 | } | |
9c1ba5c8 JK |
1362 | if (is_destroyed) { |
1363 | /* All sets are just being destroyed */ | |
1364 | ret = 0; | |
1365 | goto out; | |
1366 | } | |
a7b4f989 JK |
1367 | continue; |
1368 | } | |
1369 | /* When dumping all sets, we must dump "sorted" | |
1370 | * so that lists (unions of sets) are dumped last. | |
1371 | */ | |
c1e2e043 JK |
1372 | if (dump_type != DUMP_ONE && |
1373 | ((dump_type == DUMP_ALL) == | |
9c1ba5c8 JK |
1374 | !!(set->type->features & IPSET_DUMP_LAST))) { |
1375 | write_unlock_bh(&ip_set_ref_lock); | |
a7b4f989 | 1376 | continue; |
9c1ba5c8 | 1377 | } |
a7b4f989 | 1378 | pr_debug("List set: %s\n", set->name); |
93302880 | 1379 | if (!cb->args[IPSET_CB_ARG0]) { |
a7b4f989 JK |
1380 | /* Start listing: make sure set won't be destroyed */ |
1381 | pr_debug("reference set\n"); | |
596cf3fe | 1382 | set->ref_netlink++; |
a7b4f989 | 1383 | } |
9c1ba5c8 | 1384 | write_unlock_bh(&ip_set_ref_lock); |
15e47304 | 1385 | nlh = start_msg(skb, NETLINK_CB(cb->skb).portid, |
a7b4f989 JK |
1386 | cb->nlh->nlmsg_seq, flags, |
1387 | IPSET_CMD_LIST); | |
1388 | if (!nlh) { | |
1389 | ret = -EMSGSIZE; | |
1390 | goto release_refcount; | |
1391 | } | |
7cf7899d DM |
1392 | if (nla_put_u8(skb, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || |
1393 | nla_put_string(skb, IPSET_ATTR_SETNAME, set->name)) | |
1394 | goto nla_put_failure; | |
c1e2e043 JK |
1395 | if (dump_flags & IPSET_FLAG_LIST_SETNAME) |
1396 | goto next_set; | |
93302880 | 1397 | switch (cb->args[IPSET_CB_ARG0]) { |
a7b4f989 JK |
1398 | case 0: |
1399 | /* Core header data */ | |
7cf7899d DM |
1400 | if (nla_put_string(skb, IPSET_ATTR_TYPENAME, |
1401 | set->type->name) || | |
1402 | nla_put_u8(skb, IPSET_ATTR_FAMILY, | |
1403 | set->family) || | |
1404 | nla_put_u8(skb, IPSET_ATTR_REVISION, | |
1405 | set->revision)) | |
1406 | goto nla_put_failure; | |
a7b4f989 JK |
1407 | ret = set->variant->head(set, skb); |
1408 | if (ret < 0) | |
1409 | goto release_refcount; | |
c1e2e043 JK |
1410 | if (dump_flags & IPSET_FLAG_LIST_HEADER) |
1411 | goto next_set; | |
c4c99783 JK |
1412 | if (set->variant->uref) |
1413 | set->variant->uref(set, cb, true); | |
e8542dce | 1414 | /* fall through */ |
a7b4f989 | 1415 | default: |
a7b4f989 | 1416 | ret = set->variant->list(set, skb, cb); |
93302880 | 1417 | if (!cb->args[IPSET_CB_ARG0]) |
a7b4f989 | 1418 | /* Set is done, proceed with next one */ |
c1e2e043 | 1419 | goto next_set; |
a7b4f989 JK |
1420 | goto release_refcount; |
1421 | } | |
1422 | } | |
a8a8a093 | 1423 | /* If we dump all sets, continue with dumping last ones */ |
c1e2e043 JK |
1424 | if (dump_type == DUMP_ALL) { |
1425 | dump_type = DUMP_LAST; | |
93302880 JK |
1426 | cb->args[IPSET_CB_DUMP] = dump_type | (dump_flags << 16); |
1427 | cb->args[IPSET_CB_INDEX] = 0; | |
c4c99783 JK |
1428 | if (set && set->variant->uref) |
1429 | set->variant->uref(set, cb, false); | |
a8a8a093 JK |
1430 | goto dump_last; |
1431 | } | |
a7b4f989 JK |
1432 | goto out; |
1433 | ||
1434 | nla_put_failure: | |
1435 | ret = -EFAULT; | |
c1e2e043 JK |
1436 | next_set: |
1437 | if (dump_type == DUMP_ONE) | |
93302880 | 1438 | cb->args[IPSET_CB_INDEX] = IPSET_INVALID_ID; |
c1e2e043 | 1439 | else |
93302880 | 1440 | cb->args[IPSET_CB_INDEX]++; |
a7b4f989 JK |
1441 | release_refcount: |
1442 | /* If there was an error or set is done, release set */ | |
93302880 | 1443 | if (ret || !cb->args[IPSET_CB_ARG0]) { |
c4c99783 JK |
1444 | set = ip_set(inst, index); |
1445 | if (set->variant->uref) | |
1446 | set->variant->uref(set, cb, false); | |
1447 | pr_debug("release set %s\n", set->name); | |
596cf3fe | 1448 | __ip_set_put_netlink(set); |
93302880 | 1449 | cb->args[IPSET_CB_ARG0] = 0; |
a7b4f989 | 1450 | } |
a7b4f989 JK |
1451 | out: |
1452 | if (nlh) { | |
1453 | nlmsg_end(skb, nlh); | |
1454 | pr_debug("nlmsg_len: %u\n", nlh->nlmsg_len); | |
1455 | dump_attrs(nlh); | |
1456 | } | |
1457 | ||
1458 | return ret < 0 ? ret : skb->len; | |
1459 | } | |
1460 | ||
7b8002a1 PNA |
1461 | static int ip_set_dump(struct net *net, struct sock *ctnl, struct sk_buff *skb, |
1462 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
1463 | const struct nlattr * const attr[], |
1464 | struct netlink_ext_ack *extack) | |
a7b4f989 JK |
1465 | { |
1466 | if (unlikely(protocol_failed(attr))) | |
1467 | return -IPSET_ERR_PROTOCOL; | |
1468 | ||
80d326fa PNA |
1469 | { |
1470 | struct netlink_dump_control c = { | |
1471 | .dump = ip_set_dump_start, | |
1472 | .done = ip_set_dump_done, | |
1473 | }; | |
1474 | return netlink_dump_start(ctnl, skb, nlh, &c); | |
1475 | } | |
a7b4f989 JK |
1476 | } |
1477 | ||
1478 | /* Add, del and test */ | |
1479 | ||
1480 | static const struct nla_policy ip_set_adt_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1481 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1482 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, | |
1483 | .len = IPSET_MAXNAMELEN - 1 }, | |
1484 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, | |
1485 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, | |
1486 | [IPSET_ATTR_ADT] = { .type = NLA_NESTED }, | |
1487 | }; | |
1488 | ||
1489 | static int | |
5f52bc3c | 1490 | call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set, |
a7b4f989 JK |
1491 | struct nlattr *tb[], enum ipset_adt adt, |
1492 | u32 flags, bool use_lineno) | |
1493 | { | |
3d14b171 | 1494 | int ret; |
a7b4f989 | 1495 | u32 lineno = 0; |
3d14b171 | 1496 | bool eexist = flags & IPSET_FLAG_EXIST, retried = false; |
a7b4f989 JK |
1497 | |
1498 | do { | |
b57b2d1f | 1499 | spin_lock_bh(&set->lock); |
3d14b171 | 1500 | ret = set->variant->uadt(set, tb, adt, &lineno, flags, retried); |
b57b2d1f | 1501 | spin_unlock_bh(&set->lock); |
3d14b171 | 1502 | retried = true; |
a7b4f989 JK |
1503 | } while (ret == -EAGAIN && |
1504 | set->variant->resize && | |
3d14b171 | 1505 | (ret = set->variant->resize(set, retried)) == 0); |
a7b4f989 JK |
1506 | |
1507 | if (!ret || (ret == -IPSET_ERR_EXIST && eexist)) | |
1508 | return 0; | |
1509 | if (lineno && use_lineno) { | |
1510 | /* Error in restore/batch mode: send back lineno */ | |
5f52bc3c JK |
1511 | struct nlmsghdr *rep, *nlh = nlmsg_hdr(skb); |
1512 | struct sk_buff *skb2; | |
1513 | struct nlmsgerr *errmsg; | |
73e64e18 JK |
1514 | size_t payload = min(SIZE_MAX, |
1515 | sizeof(*errmsg) + nlmsg_len(nlh)); | |
573ce260 | 1516 | int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); |
ca0f6a5c | 1517 | struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1]; |
5f52bc3c | 1518 | struct nlattr *cmdattr; |
a7b4f989 JK |
1519 | u32 *errline; |
1520 | ||
5f52bc3c | 1521 | skb2 = nlmsg_new(payload, GFP_KERNEL); |
ca0f6a5c | 1522 | if (!skb2) |
5f52bc3c | 1523 | return -ENOMEM; |
15e47304 | 1524 | rep = __nlmsg_put(skb2, NETLINK_CB(skb).portid, |
5f52bc3c JK |
1525 | nlh->nlmsg_seq, NLMSG_ERROR, payload, 0); |
1526 | errmsg = nlmsg_data(rep); | |
1527 | errmsg->error = ret; | |
1528 | memcpy(&errmsg->msg, nlh, nlh->nlmsg_len); | |
1529 | cmdattr = (void *)&errmsg->msg + min_len; | |
1530 | ||
fceb6435 JB |
1531 | nla_parse(cda, IPSET_ATTR_CMD_MAX, cmdattr, |
1532 | nlh->nlmsg_len - min_len, ip_set_adt_policy, NULL); | |
a7b4f989 JK |
1533 | |
1534 | errline = nla_data(cda[IPSET_ATTR_LINENO]); | |
1535 | ||
1536 | *errline = lineno; | |
5f52bc3c | 1537 | |
ca0f6a5c JK |
1538 | netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, |
1539 | MSG_DONTWAIT); | |
5f52bc3c JK |
1540 | /* Signal netlink not to send its ACK/errmsg. */ |
1541 | return -EINTR; | |
a7b4f989 JK |
1542 | } |
1543 | ||
1544 | return ret; | |
1545 | } | |
1546 | ||
7b8002a1 PNA |
1547 | static int ip_set_uadd(struct net *net, struct sock *ctnl, struct sk_buff *skb, |
1548 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
1549 | const struct nlattr * const attr[], |
1550 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1551 | { |
7b8002a1 | 1552 | struct ip_set_net *inst = ip_set_pernet(net); |
a7b4f989 | 1553 | struct ip_set *set; |
ca0f6a5c | 1554 | struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; |
a7b4f989 JK |
1555 | const struct nlattr *nla; |
1556 | u32 flags = flag_exist(nlh); | |
1557 | bool use_lineno; | |
1558 | int ret = 0; | |
1559 | ||
1560 | if (unlikely(protocol_failed(attr) || | |
ca0f6a5c | 1561 | !attr[IPSET_ATTR_SETNAME] || |
a7b4f989 JK |
1562 | !((attr[IPSET_ATTR_DATA] != NULL) ^ |
1563 | (attr[IPSET_ATTR_ADT] != NULL)) || | |
ca0f6a5c | 1564 | (attr[IPSET_ATTR_DATA] && |
a7b4f989 | 1565 | !flag_nested(attr[IPSET_ATTR_DATA])) || |
ca0f6a5c | 1566 | (attr[IPSET_ATTR_ADT] && |
a7b4f989 | 1567 | (!flag_nested(attr[IPSET_ATTR_ADT]) || |
ca0f6a5c | 1568 | !attr[IPSET_ATTR_LINENO])))) |
a7b4f989 JK |
1569 | return -IPSET_ERR_PROTOCOL; |
1570 | ||
1785e8f4 | 1571 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
ca0f6a5c | 1572 | if (!set) |
a7b4f989 JK |
1573 | return -ENOENT; |
1574 | ||
1575 | use_lineno = !!attr[IPSET_ATTR_LINENO]; | |
1576 | if (attr[IPSET_ATTR_DATA]) { | |
8da560ce PM |
1577 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
1578 | attr[IPSET_ATTR_DATA], | |
fceb6435 | 1579 | set->type->adt_policy, NULL)) |
a7b4f989 | 1580 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c JK |
1581 | ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, flags, |
1582 | use_lineno); | |
a7b4f989 JK |
1583 | } else { |
1584 | int nla_rem; | |
1585 | ||
1586 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { | |
1587 | memset(tb, 0, sizeof(tb)); | |
1588 | if (nla_type(nla) != IPSET_ATTR_DATA || | |
1589 | !flag_nested(nla) || | |
8da560ce | 1590 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
fceb6435 | 1591 | set->type->adt_policy, NULL)) |
a7b4f989 | 1592 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c | 1593 | ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, |
a7b4f989 JK |
1594 | flags, use_lineno); |
1595 | if (ret < 0) | |
1596 | return ret; | |
1597 | } | |
1598 | } | |
1599 | return ret; | |
1600 | } | |
1601 | ||
7b8002a1 PNA |
1602 | static int ip_set_udel(struct net *net, struct sock *ctnl, struct sk_buff *skb, |
1603 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
1604 | const struct nlattr * const attr[], |
1605 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1606 | { |
7b8002a1 | 1607 | struct ip_set_net *inst = ip_set_pernet(net); |
a7b4f989 | 1608 | struct ip_set *set; |
ca0f6a5c | 1609 | struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; |
a7b4f989 JK |
1610 | const struct nlattr *nla; |
1611 | u32 flags = flag_exist(nlh); | |
1612 | bool use_lineno; | |
1613 | int ret = 0; | |
1614 | ||
1615 | if (unlikely(protocol_failed(attr) || | |
ca0f6a5c | 1616 | !attr[IPSET_ATTR_SETNAME] || |
a7b4f989 JK |
1617 | !((attr[IPSET_ATTR_DATA] != NULL) ^ |
1618 | (attr[IPSET_ATTR_ADT] != NULL)) || | |
ca0f6a5c | 1619 | (attr[IPSET_ATTR_DATA] && |
a7b4f989 | 1620 | !flag_nested(attr[IPSET_ATTR_DATA])) || |
ca0f6a5c | 1621 | (attr[IPSET_ATTR_ADT] && |
a7b4f989 | 1622 | (!flag_nested(attr[IPSET_ATTR_ADT]) || |
ca0f6a5c | 1623 | !attr[IPSET_ATTR_LINENO])))) |
a7b4f989 JK |
1624 | return -IPSET_ERR_PROTOCOL; |
1625 | ||
1785e8f4 | 1626 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
ca0f6a5c | 1627 | if (!set) |
a7b4f989 JK |
1628 | return -ENOENT; |
1629 | ||
1630 | use_lineno = !!attr[IPSET_ATTR_LINENO]; | |
1631 | if (attr[IPSET_ATTR_DATA]) { | |
8da560ce PM |
1632 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
1633 | attr[IPSET_ATTR_DATA], | |
fceb6435 | 1634 | set->type->adt_policy, NULL)) |
a7b4f989 | 1635 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c JK |
1636 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, flags, |
1637 | use_lineno); | |
a7b4f989 JK |
1638 | } else { |
1639 | int nla_rem; | |
1640 | ||
1641 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { | |
1642 | memset(tb, 0, sizeof(*tb)); | |
1643 | if (nla_type(nla) != IPSET_ATTR_DATA || | |
1644 | !flag_nested(nla) || | |
8da560ce | 1645 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
fceb6435 | 1646 | set->type->adt_policy, NULL)) |
a7b4f989 | 1647 | return -IPSET_ERR_PROTOCOL; |
5f52bc3c | 1648 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, |
a7b4f989 JK |
1649 | flags, use_lineno); |
1650 | if (ret < 0) | |
1651 | return ret; | |
1652 | } | |
1653 | } | |
1654 | return ret; | |
1655 | } | |
1656 | ||
7b8002a1 PNA |
1657 | static int ip_set_utest(struct net *net, struct sock *ctnl, struct sk_buff *skb, |
1658 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
1659 | const struct nlattr * const attr[], |
1660 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1661 | { |
7b8002a1 | 1662 | struct ip_set_net *inst = ip_set_pernet(net); |
a7b4f989 | 1663 | struct ip_set *set; |
ca0f6a5c | 1664 | struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; |
a7b4f989 JK |
1665 | int ret = 0; |
1666 | ||
1667 | if (unlikely(protocol_failed(attr) || | |
ca0f6a5c JK |
1668 | !attr[IPSET_ATTR_SETNAME] || |
1669 | !attr[IPSET_ATTR_DATA] || | |
a7b4f989 JK |
1670 | !flag_nested(attr[IPSET_ATTR_DATA]))) |
1671 | return -IPSET_ERR_PROTOCOL; | |
1672 | ||
1785e8f4 | 1673 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
ca0f6a5c | 1674 | if (!set) |
a7b4f989 JK |
1675 | return -ENOENT; |
1676 | ||
8da560ce | 1677 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA], |
fceb6435 | 1678 | set->type->adt_policy, NULL)) |
a7b4f989 JK |
1679 | return -IPSET_ERR_PROTOCOL; |
1680 | ||
b57b2d1f | 1681 | rcu_read_lock_bh(); |
3d14b171 | 1682 | ret = set->variant->uadt(set, tb, IPSET_TEST, NULL, 0, 0); |
b57b2d1f | 1683 | rcu_read_unlock_bh(); |
a7b4f989 JK |
1684 | /* Userspace can't trigger element to be re-added */ |
1685 | if (ret == -EAGAIN) | |
1686 | ret = 1; | |
1687 | ||
0f1799ba | 1688 | return ret > 0 ? 0 : -IPSET_ERR_EXIST; |
a7b4f989 JK |
1689 | } |
1690 | ||
1691 | /* Get headed data of a set */ | |
1692 | ||
7b8002a1 PNA |
1693 | static int ip_set_header(struct net *net, struct sock *ctnl, |
1694 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1695 | const struct nlattr * const attr[], |
1696 | struct netlink_ext_ack *extack) | |
a7b4f989 | 1697 | { |
7b8002a1 | 1698 | struct ip_set_net *inst = ip_set_pernet(net); |
a7b4f989 JK |
1699 | const struct ip_set *set; |
1700 | struct sk_buff *skb2; | |
1701 | struct nlmsghdr *nlh2; | |
a7b4f989 JK |
1702 | int ret = 0; |
1703 | ||
1704 | if (unlikely(protocol_failed(attr) || | |
ca0f6a5c | 1705 | !attr[IPSET_ATTR_SETNAME])) |
a7b4f989 JK |
1706 | return -IPSET_ERR_PROTOCOL; |
1707 | ||
1785e8f4 | 1708 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
ca0f6a5c | 1709 | if (!set) |
a7b4f989 | 1710 | return -ENOENT; |
a7b4f989 JK |
1711 | |
1712 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
ca0f6a5c | 1713 | if (!skb2) |
a7b4f989 JK |
1714 | return -ENOMEM; |
1715 | ||
15e47304 | 1716 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
a7b4f989 JK |
1717 | IPSET_CMD_HEADER); |
1718 | if (!nlh2) | |
1719 | goto nlmsg_failure; | |
7cf7899d DM |
1720 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || |
1721 | nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name) || | |
1722 | nla_put_string(skb2, IPSET_ATTR_TYPENAME, set->type->name) || | |
1723 | nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) || | |
1724 | nla_put_u8(skb2, IPSET_ATTR_REVISION, set->revision)) | |
1725 | goto nla_put_failure; | |
a7b4f989 JK |
1726 | nlmsg_end(skb2, nlh2); |
1727 | ||
15e47304 | 1728 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
a7b4f989 JK |
1729 | if (ret < 0) |
1730 | return ret; | |
1731 | ||
1732 | return 0; | |
1733 | ||
1734 | nla_put_failure: | |
1735 | nlmsg_cancel(skb2, nlh2); | |
1736 | nlmsg_failure: | |
1737 | kfree_skb(skb2); | |
1738 | return -EMSGSIZE; | |
1739 | } | |
1740 | ||
1741 | /* Get type data */ | |
1742 | ||
1743 | static const struct nla_policy ip_set_type_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1744 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1745 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, | |
1746 | .len = IPSET_MAXNAMELEN - 1 }, | |
1747 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, | |
1748 | }; | |
1749 | ||
7b8002a1 PNA |
1750 | static int ip_set_type(struct net *net, struct sock *ctnl, struct sk_buff *skb, |
1751 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
1752 | const struct nlattr * const attr[], |
1753 | struct netlink_ext_ack *extack) | |
a7b4f989 JK |
1754 | { |
1755 | struct sk_buff *skb2; | |
1756 | struct nlmsghdr *nlh2; | |
1757 | u8 family, min, max; | |
1758 | const char *typename; | |
1759 | int ret = 0; | |
1760 | ||
1761 | if (unlikely(protocol_failed(attr) || | |
ca0f6a5c JK |
1762 | !attr[IPSET_ATTR_TYPENAME] || |
1763 | !attr[IPSET_ATTR_FAMILY])) | |
a7b4f989 JK |
1764 | return -IPSET_ERR_PROTOCOL; |
1765 | ||
1766 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); | |
1767 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); | |
1768 | ret = find_set_type_minmax(typename, family, &min, &max); | |
1769 | if (ret) | |
1770 | return ret; | |
1771 | ||
1772 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
ca0f6a5c | 1773 | if (!skb2) |
a7b4f989 JK |
1774 | return -ENOMEM; |
1775 | ||
15e47304 | 1776 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
a7b4f989 JK |
1777 | IPSET_CMD_TYPE); |
1778 | if (!nlh2) | |
1779 | goto nlmsg_failure; | |
7cf7899d DM |
1780 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || |
1781 | nla_put_string(skb2, IPSET_ATTR_TYPENAME, typename) || | |
1782 | nla_put_u8(skb2, IPSET_ATTR_FAMILY, family) || | |
1783 | nla_put_u8(skb2, IPSET_ATTR_REVISION, max) || | |
1784 | nla_put_u8(skb2, IPSET_ATTR_REVISION_MIN, min)) | |
1785 | goto nla_put_failure; | |
a7b4f989 JK |
1786 | nlmsg_end(skb2, nlh2); |
1787 | ||
1788 | pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len); | |
15e47304 | 1789 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
a7b4f989 JK |
1790 | if (ret < 0) |
1791 | return ret; | |
1792 | ||
1793 | return 0; | |
1794 | ||
1795 | nla_put_failure: | |
1796 | nlmsg_cancel(skb2, nlh2); | |
1797 | nlmsg_failure: | |
1798 | kfree_skb(skb2); | |
1799 | return -EMSGSIZE; | |
1800 | } | |
1801 | ||
1802 | /* Get protocol version */ | |
1803 | ||
1804 | static const struct nla_policy | |
1805 | ip_set_protocol_policy[IPSET_ATTR_CMD_MAX + 1] = { | |
1806 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, | |
1807 | }; | |
1808 | ||
7b8002a1 PNA |
1809 | static int ip_set_protocol(struct net *net, struct sock *ctnl, |
1810 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1811 | const struct nlattr * const attr[], |
1812 | struct netlink_ext_ack *extack) | |
a7b4f989 JK |
1813 | { |
1814 | struct sk_buff *skb2; | |
1815 | struct nlmsghdr *nlh2; | |
1816 | int ret = 0; | |
1817 | ||
ca0f6a5c | 1818 | if (unlikely(!attr[IPSET_ATTR_PROTOCOL])) |
a7b4f989 JK |
1819 | return -IPSET_ERR_PROTOCOL; |
1820 | ||
1821 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
ca0f6a5c | 1822 | if (!skb2) |
a7b4f989 JK |
1823 | return -ENOMEM; |
1824 | ||
15e47304 | 1825 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
a7b4f989 JK |
1826 | IPSET_CMD_PROTOCOL); |
1827 | if (!nlh2) | |
1828 | goto nlmsg_failure; | |
7cf7899d DM |
1829 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL)) |
1830 | goto nla_put_failure; | |
a7b4f989 JK |
1831 | nlmsg_end(skb2, nlh2); |
1832 | ||
15e47304 | 1833 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
a7b4f989 JK |
1834 | if (ret < 0) |
1835 | return ret; | |
1836 | ||
1837 | return 0; | |
1838 | ||
1839 | nla_put_failure: | |
1840 | nlmsg_cancel(skb2, nlh2); | |
1841 | nlmsg_failure: | |
1842 | kfree_skb(skb2); | |
1843 | return -EMSGSIZE; | |
1844 | } | |
1845 | ||
1846 | static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = { | |
d31f4d44 TB |
1847 | [IPSET_CMD_NONE] = { |
1848 | .call = ip_set_none, | |
1849 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1850 | }, | |
a7b4f989 JK |
1851 | [IPSET_CMD_CREATE] = { |
1852 | .call = ip_set_create, | |
1853 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1854 | .policy = ip_set_create_policy, | |
1855 | }, | |
1856 | [IPSET_CMD_DESTROY] = { | |
1857 | .call = ip_set_destroy, | |
1858 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1859 | .policy = ip_set_setname_policy, | |
1860 | }, | |
1861 | [IPSET_CMD_FLUSH] = { | |
1862 | .call = ip_set_flush, | |
1863 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1864 | .policy = ip_set_setname_policy, | |
1865 | }, | |
1866 | [IPSET_CMD_RENAME] = { | |
1867 | .call = ip_set_rename, | |
1868 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1869 | .policy = ip_set_setname2_policy, | |
1870 | }, | |
1871 | [IPSET_CMD_SWAP] = { | |
1872 | .call = ip_set_swap, | |
1873 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1874 | .policy = ip_set_setname2_policy, | |
1875 | }, | |
1876 | [IPSET_CMD_LIST] = { | |
1877 | .call = ip_set_dump, | |
1878 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1879 | .policy = ip_set_setname_policy, | |
1880 | }, | |
1881 | [IPSET_CMD_SAVE] = { | |
1882 | .call = ip_set_dump, | |
1883 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1884 | .policy = ip_set_setname_policy, | |
1885 | }, | |
1886 | [IPSET_CMD_ADD] = { | |
1887 | .call = ip_set_uadd, | |
1888 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1889 | .policy = ip_set_adt_policy, | |
1890 | }, | |
1891 | [IPSET_CMD_DEL] = { | |
1892 | .call = ip_set_udel, | |
1893 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1894 | .policy = ip_set_adt_policy, | |
1895 | }, | |
1896 | [IPSET_CMD_TEST] = { | |
1897 | .call = ip_set_utest, | |
1898 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1899 | .policy = ip_set_adt_policy, | |
1900 | }, | |
1901 | [IPSET_CMD_HEADER] = { | |
1902 | .call = ip_set_header, | |
1903 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1904 | .policy = ip_set_setname_policy, | |
1905 | }, | |
1906 | [IPSET_CMD_TYPE] = { | |
1907 | .call = ip_set_type, | |
1908 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1909 | .policy = ip_set_type_policy, | |
1910 | }, | |
1911 | [IPSET_CMD_PROTOCOL] = { | |
1912 | .call = ip_set_protocol, | |
1913 | .attr_count = IPSET_ATTR_CMD_MAX, | |
1914 | .policy = ip_set_protocol_policy, | |
1915 | }, | |
1916 | }; | |
1917 | ||
1918 | static struct nfnetlink_subsystem ip_set_netlink_subsys __read_mostly = { | |
1919 | .name = "ip_set", | |
1920 | .subsys_id = NFNL_SUBSYS_IPSET, | |
1921 | .cb_count = IPSET_MSG_MAX, | |
1922 | .cb = ip_set_netlink_subsys_cb, | |
1923 | }; | |
1924 | ||
1925 | /* Interface to iptables/ip6tables */ | |
1926 | ||
1927 | static int | |
1928 | ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len) | |
1929 | { | |
95c96174 | 1930 | unsigned int *op; |
a7b4f989 JK |
1931 | void *data; |
1932 | int copylen = *len, ret = 0; | |
1785e8f4 VL |
1933 | struct net *net = sock_net(sk); |
1934 | struct ip_set_net *inst = ip_set_pernet(net); | |
a7b4f989 | 1935 | |
1785e8f4 | 1936 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
a7b4f989 JK |
1937 | return -EPERM; |
1938 | if (optval != SO_IP_SET) | |
1939 | return -EBADF; | |
95c96174 | 1940 | if (*len < sizeof(unsigned int)) |
a7b4f989 JK |
1941 | return -EINVAL; |
1942 | ||
1943 | data = vmalloc(*len); | |
1944 | if (!data) | |
1945 | return -ENOMEM; | |
1946 | if (copy_from_user(data, user, *len) != 0) { | |
1947 | ret = -EFAULT; | |
1948 | goto done; | |
1949 | } | |
68ad546a | 1950 | op = data; |
a7b4f989 JK |
1951 | |
1952 | if (*op < IP_SET_OP_VERSION) { | |
1953 | /* Check the version at the beginning of operations */ | |
1954 | struct ip_set_req_version *req_version = data; | |
2196937e DC |
1955 | |
1956 | if (*len < sizeof(struct ip_set_req_version)) { | |
1957 | ret = -EINVAL; | |
1958 | goto done; | |
1959 | } | |
1960 | ||
a7b4f989 JK |
1961 | if (req_version->version != IPSET_PROTOCOL) { |
1962 | ret = -EPROTO; | |
1963 | goto done; | |
1964 | } | |
1965 | } | |
1966 | ||
1967 | switch (*op) { | |
1968 | case IP_SET_OP_VERSION: { | |
1969 | struct ip_set_req_version *req_version = data; | |
1970 | ||
1971 | if (*len != sizeof(struct ip_set_req_version)) { | |
1972 | ret = -EINVAL; | |
1973 | goto done; | |
1974 | } | |
1975 | ||
1976 | req_version->version = IPSET_PROTOCOL; | |
1977 | ret = copy_to_user(user, req_version, | |
1978 | sizeof(struct ip_set_req_version)); | |
1979 | goto done; | |
1980 | } | |
1981 | case IP_SET_OP_GET_BYNAME: { | |
1982 | struct ip_set_req_get_set *req_get = data; | |
9076aea7 | 1983 | ip_set_id_t id; |
a7b4f989 JK |
1984 | |
1985 | if (*len != sizeof(struct ip_set_req_get_set)) { | |
1986 | ret = -EINVAL; | |
1987 | goto done; | |
1988 | } | |
1989 | req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; | |
c14b78e7 | 1990 | nfnl_lock(NFNL_SUBSYS_IPSET); |
1785e8f4 | 1991 | find_set_and_id(inst, req_get->set.name, &id); |
9076aea7 | 1992 | req_get->set.index = id; |
c14b78e7 | 1993 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
1994 | goto copy; |
1995 | } | |
5e04c0c3 JK |
1996 | case IP_SET_OP_GET_FNAME: { |
1997 | struct ip_set_req_get_set_family *req_get = data; | |
1998 | ip_set_id_t id; | |
1999 | ||
2000 | if (*len != sizeof(struct ip_set_req_get_set_family)) { | |
2001 | ret = -EINVAL; | |
2002 | goto done; | |
2003 | } | |
2004 | req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; | |
2005 | nfnl_lock(NFNL_SUBSYS_IPSET); | |
1785e8f4 | 2006 | find_set_and_id(inst, req_get->set.name, &id); |
5e04c0c3 JK |
2007 | req_get->set.index = id; |
2008 | if (id != IPSET_INVALID_ID) | |
3e90ebd3 | 2009 | req_get->family = ip_set(inst, id)->family; |
5e04c0c3 JK |
2010 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
2011 | goto copy; | |
2012 | } | |
a7b4f989 JK |
2013 | case IP_SET_OP_GET_BYINDEX: { |
2014 | struct ip_set_req_get_set *req_get = data; | |
9076aea7 | 2015 | struct ip_set *set; |
a7b4f989 JK |
2016 | |
2017 | if (*len != sizeof(struct ip_set_req_get_set) || | |
1785e8f4 | 2018 | req_get->set.index >= inst->ip_set_max) { |
a7b4f989 JK |
2019 | ret = -EINVAL; |
2020 | goto done; | |
2021 | } | |
c14b78e7 | 2022 | nfnl_lock(NFNL_SUBSYS_IPSET); |
3e90ebd3 | 2023 | set = ip_set(inst, req_get->set.index); |
9076aea7 | 2024 | strncpy(req_get->set.name, set ? set->name : "", |
a7b4f989 | 2025 | IPSET_MAXNAMELEN); |
c14b78e7 | 2026 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
a7b4f989 JK |
2027 | goto copy; |
2028 | } | |
2029 | default: | |
2030 | ret = -EBADMSG; | |
2031 | goto done; | |
2032 | } /* end of switch(op) */ | |
2033 | ||
2034 | copy: | |
2035 | ret = copy_to_user(user, data, copylen); | |
2036 | ||
2037 | done: | |
2038 | vfree(data); | |
2039 | if (ret > 0) | |
2040 | ret = 0; | |
2041 | return ret; | |
2042 | } | |
2043 | ||
2044 | static struct nf_sockopt_ops so_set __read_mostly = { | |
2045 | .pf = PF_INET, | |
2046 | .get_optmin = SO_IP_SET, | |
2047 | .get_optmax = SO_IP_SET + 1, | |
d4ef3835 | 2048 | .get = ip_set_sockfn_get, |
a7b4f989 JK |
2049 | .owner = THIS_MODULE, |
2050 | }; | |
2051 | ||
1785e8f4 VL |
2052 | static int __net_init |
2053 | ip_set_net_init(struct net *net) | |
a7b4f989 | 2054 | { |
1785e8f4 | 2055 | struct ip_set_net *inst = ip_set_pernet(net); |
9076aea7 | 2056 | struct ip_set **list; |
a7b4f989 | 2057 | |
1785e8f4 VL |
2058 | inst->ip_set_max = max_sets ? max_sets : CONFIG_IP_SET_MAX; |
2059 | if (inst->ip_set_max >= IPSET_INVALID_ID) | |
2060 | inst->ip_set_max = IPSET_INVALID_ID - 1; | |
a7b4f989 | 2061 | |
ca0f6a5c | 2062 | list = kcalloc(inst->ip_set_max, sizeof(struct ip_set *), GFP_KERNEL); |
9076aea7 | 2063 | if (!list) |
a7b4f989 | 2064 | return -ENOMEM; |
9c1ba5c8 JK |
2065 | inst->is_deleted = false; |
2066 | inst->is_destroyed = false; | |
1785e8f4 | 2067 | rcu_assign_pointer(inst->ip_set_list, list); |
1785e8f4 VL |
2068 | return 0; |
2069 | } | |
2070 | ||
2071 | static void __net_exit | |
2072 | ip_set_net_exit(struct net *net) | |
2073 | { | |
2074 | struct ip_set_net *inst = ip_set_pernet(net); | |
2075 | ||
2076 | struct ip_set *set = NULL; | |
2077 | ip_set_id_t i; | |
2078 | ||
9c1ba5c8 | 2079 | inst->is_deleted = true; /* flag for ip_set_nfnl_put */ |
1785e8f4 | 2080 | |
f998b6b1 | 2081 | nfnl_lock(NFNL_SUBSYS_IPSET); |
1785e8f4 | 2082 | for (i = 0; i < inst->ip_set_max; i++) { |
3e90ebd3 | 2083 | set = ip_set(inst, i); |
9c1ba5c8 JK |
2084 | if (set) { |
2085 | ip_set(inst, i) = NULL; | |
2086 | ip_set_destroy_set(set); | |
2087 | } | |
1785e8f4 | 2088 | } |
f998b6b1 | 2089 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
1785e8f4 VL |
2090 | kfree(rcu_dereference_protected(inst->ip_set_list, 1)); |
2091 | } | |
2092 | ||
2093 | static struct pernet_operations ip_set_net_ops = { | |
2094 | .init = ip_set_net_init, | |
2095 | .exit = ip_set_net_exit, | |
2096 | .id = &ip_set_net_id, | |
a5a179b6 | 2097 | .size = sizeof(struct ip_set_net), |
1785e8f4 VL |
2098 | }; |
2099 | ||
1785e8f4 VL |
2100 | static int __init |
2101 | ip_set_init(void) | |
2102 | { | |
e23ed762 | 2103 | int ret = register_pernet_subsys(&ip_set_net_ops); |
ca0f6a5c | 2104 | |
e23ed762 FW |
2105 | if (ret) { |
2106 | pr_err("ip_set: cannot register pernet_subsys.\n"); | |
2107 | return ret; | |
2108 | } | |
2109 | ||
2110 | ret = nfnetlink_subsys_register(&ip_set_netlink_subsys); | |
a7b4f989 JK |
2111 | if (ret != 0) { |
2112 | pr_err("ip_set: cannot register with nfnetlink.\n"); | |
e23ed762 | 2113 | unregister_pernet_subsys(&ip_set_net_ops); |
a7b4f989 JK |
2114 | return ret; |
2115 | } | |
e23ed762 | 2116 | |
a7b4f989 JK |
2117 | ret = nf_register_sockopt(&so_set); |
2118 | if (ret != 0) { | |
2119 | pr_err("SO_SET registry failed: %d\n", ret); | |
2120 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); | |
e23ed762 | 2121 | unregister_pernet_subsys(&ip_set_net_ops); |
a7b4f989 JK |
2122 | return ret; |
2123 | } | |
e23ed762 | 2124 | |
a7b4f989 JK |
2125 | return 0; |
2126 | } | |
2127 | ||
2128 | static void __exit | |
2129 | ip_set_fini(void) | |
2130 | { | |
a7b4f989 JK |
2131 | nf_unregister_sockopt(&so_set); |
2132 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); | |
e23ed762 FW |
2133 | |
2134 | unregister_pernet_subsys(&ip_set_net_ops); | |
a7b4f989 JK |
2135 | pr_debug("these are the famous last words\n"); |
2136 | } | |
2137 | ||
2138 | module_init(ip_set_init); | |
2139 | module_exit(ip_set_fini); | |
e5531166 PNA |
2140 | |
2141 | MODULE_DESCRIPTION("ip_set: protocol " __stringify(IPSET_PROTOCOL)); |