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