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