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Linux/net/netfilter/ipset/ip_set_core.c

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

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